Carbon-dioxide fire-fighting device

FIELD: fire-fighting, particularly special adaptations of indicating, measuring, or monitoring equipment.

SUBSTANCE: fire-fighting device comprises cylinder filled with fire-extinguishing composition and means to indicate gas losses owing to gas leakage from the cylinder. The means comprises capacitive sensor calibrated in temperature range below and above critical carbon dioxide temperature.

EFFECT: increased reliability of gas leakage determination without cylinder weighting.

17 cl, 6 dwg

 

The present invention relates to a carbon dioxide fire-fighting device.

The level of technology

Fire devices employing gaseous fire-extinguishing agent, in accordance with the fire safety rules need to be monitored for loss of gas due to leakage from a container in which pressure is kept extinguisher. In the case of tanks intended for storage of carbon dioxide as the extinguishing agent, it is necessary to ensure the provision of timely and reliable determination of magnitude of the gas losses exceeding 10% of its entire initially charged into the cylinder mass. During periodic checks of non-stationary (hand carried) carbon dioxide fire extinguishers weigh them using a properly calibrated scale. During the inspection of fire extinguishers in such a way to detect the loss of gas during the period between the two tests did not. In fixed carbon dioxide fire protection systems and devices them filled with carbon dioxide cylinders individually suspended from the weighing device to continuously monitor the weight of each individual container. When you reduce the weight of the container below a certain value, a warning signal. The use of such vzvesivaju the x devices for suspension cylinders with carbon dioxide significantly increases the cost of fixed fire-fighting device. In addition, regular verification of such weighing devices.

Up to this time there was no acceptable alternative to weighing cylinders with carbon dioxide to control the weight of their contents.

The pressure control to determine the magnitude of the losses of carbon dioxide gas due to its leakage from the container is absolutely not suitable for the above purposes, because in normal relative volume of filling, equal to 1:1,50 (i.e. when the specific mass contained in the cylinder of carbon dioxide, equal 0,666 kg per liter of volume of the container), and at temperatures below 27°With the loss of gas, the value of which is 10%, not accompanied by a significant pressure drop in the tank (when the relative amount of filling, equal to 1:1,34, i.e. when the specific mass contained in the cylinder dioxide carbon, equal 0,746 kg per liter of volume of the container, the lower temperature limit is even about 22°). In addition, the pressure in the filled with carbon dioxide cylinder substantially depends on the temperature.

Float level at least as applied to fire protection devices should also not be considered as an acceptable alternative to weighing cylinders with carbon dioxide. Thus, in particular, the valve with a built in float level gauge, before the its, for example, in patent US 4580450 for use in cylinders with carbon dioxide, is not suitable for use in a carbon dioxide fire protection systems and devices, because the system of rods and levers sensor is placed at the base of the specified valve is relatively much space, which inevitably leads to the decrease of the inlet for gas at the base of the valve to a relatively small size. In this regard it should be noted that in accordance with DIN 477 in the neck of tanks intended for fixed carbon dioxide fire-fighting devices, you can only run holes inch internal thread W28,8×1/14. In this hole with internal thread is screwed into the base of the valve, the diameter of the inlet in which (the basis) for the fire-extinguishing agent shall be not less than 12 mm, so that when casting fire devices in the action of the pressure loss in the flow of carbon dioxide in the way of its passage in the valve remained at a low level.

Alternatively, a mechanical float gauge in the patent US 5701932 it was proposed to use to fill high-purity gas cylinders valve with integrated capacitive sensor. The principle of operation described in this patent US 5701932 capacitive sensor is based on the fact that in condensed status is anii gas has a significantly greater magnitude of the dielectric constant, than in the gaseous state, and therefore the lowering of the liquid level in the tank is accompanied by a significant reduction of the capacity of the probe. In accordance with this based on a similar principle measurement assumes its conducting at a given ambient temperature, at which the contents of the container is guaranteed to be present in the form of two separate phases, and involves the lowering of the liquid phase in the tank when selecting from it gas. However, unlike under US patent 5701932 applications described therein device for measurements in high-purity gases the above conditions have not always been in place in the container with carbon dioxide, intended for use in fire engineering. This is due to the fact that, in practice, used in the carbon dioxide fire protection systems and devices cylinders with carbon dioxide is placed, in particular, in the shops or machine halls for fire protection of different kinds of objects, where ambient temperatures can rise above 40°C. With this in mind, when the relative amount of filling of the container with carbon dioxide, equal to 1:1,50 (i.e. when the specific mass contained in the cylinder of carbon dioxide, equal 0,666 kg per liter of volume of the container), the liquid phase of carbon dioxide completely occupies the entire volume of the container is already on is different from the temperature of 27.2° With, and therefore, above this temperature the gas loss is not necessarily accompanied by a change in the liquid level in the tank. In addition, the critical temperature of carbon dioxide, from which he is able supercritical fluid, in which under any conditions no longer exist differences between the gaseous and liquid phases, is 31°C.

In addition, in relation to known from patent US 5701932 valve with the capacitive sensor it should be noted that it is from the point of view of hydrodynamics is not suitable for use in filled with carbon dioxide cylinders used in carbon-dioxide fire-fighting devices. This is due to the fact that the capacitive probe when it is embedded in the base of the valve with the outer inch thread W28,8×1/14 takes so much space that this valve base just isn't enough space to perform the inlet diameter of not less than 12 mm for the passage of carbon dioxide gas, used as extinguishing media. Obviously, in order to ensure sufficient space for such inlets with a diameter of 12 mm at the base of the valve could further reduce the diameter of the capacitive electrode. However, you should take into account the possible reduction in the strength of smertelnogo probe, what is unacceptable in relation to the importance to safety of the item.

The objective of the invention

Based on the foregoing, the present invention was based on the task to develop a methodology that would allow and at low and at high ambient temperatures reliably determine the amount of gas loss in carbon-dioxide fire-fighting device due to its leakage used in this device is a balloon with carbon dioxide without weighing of the container. This task is solved according to the invention using the device, introduced in claim 1 of the claims.

Brief description of the invention

To determine the magnitude of the loss of carbon dioxide gas due to its leakage from the container, which is filled with such gas, in the proposed invention, carbon dioxide fire fighting device uses a capacitive measuring device, calibrated for the temperature range below and above the critical temperature of carbon dioxide. In other words, the proposed invention approach is based on the fact unexpectedly established fact that the capacitive measuring device allows not only the usual way to register the change in the liquid level in the tank, but definitely relate measurable change in the electrical capacity in the guise loss of gas due to leakage from the container even in the case if the temperature of the carbon dioxide exceeds a critical temperature, i.e., if carbon dioxide is in a state in which there is no physical differences between its gaseous and liquid phases. In accordance with this invention offers a simple solution which allows to reliably determine the value of loss of carbon dioxide gas due to leakage from a cylinder used in a carbon dioxide fire-fighting device, and which allows its application including at high ambient temperatures (i.e. at temperatures above 30° (C) and makes unnecessary time-consuming weighing of the container with carbon dioxide.

Such capacitive measuring device preferably has a capacitive probe passing through the entire height of the container, a measuring module for measuring capacitance of a capacitive measuring probe, microprocessor designed to handle the results of measurement of capacitance of the capacitive measuring probe and allows you to correlate the measured capacitance of the capacitive measuring probe with the corresponding amount of gas loss due to leakage from the cylinder, and means for generating the warning signal, if detected by the microprocessor, the amount of gas losses greater than some specified value.

Calibration pre is respectfully done with the use of electronic means, what is it used for, for example, a temperature sensor and a memory for storing calibration values for the temperature range below and above the critical temperature of carbon dioxide. When the microprocessor for correlating the measured changes in the capacitance of the capacitive measuring probe with the corresponding amount of gas loss due to leakage from the container reads these calibration values from the memory based on the measured temperature. In that case, if the detected value of the gas losses greater than some specified value, the microprocessor issues a warning signal.

Such a device is most suitable for monitoring the content of carbon dioxide gas in the cylinder at high and at low ambient temperatures. In accordance with this specified device is suitable for its application primarily in carbon-dioxide fire-fighting devices when the ambient temperature is in the range of -20 to +60°C.

To provide such a capacitive measuring device in a carbon dioxide fire protection device in combination with filled with carbon dioxide gas cylinder the present invention can effectively solve another problem associated with the transmission capacitive electrode through a narrow hole in golovasecheva carbon dioxide cylinder inside of it with virtually no increase in this resistance to the expiration of carbon dioxide gas, used as fire-extinguishing agent from the container. To this end filled with carbon dioxide cylinder is proposed according to the present invention to equip the exhaust valve with built-in capacitive measuring probe, the first measuring electrode which is formed of a lifting tube, which enters the base of the valve, and the second measuring electrode is formed covering this lifting tube on the outside and separated from it along the entire length of the interelectrode gap of the outer tube. The use of exhaust valve of such construction allows, ultimately, to simplify and to increase the frequency control manual and portable carbon dioxide fire extinguishers on the subject of loss of gas due to leakage, respectively, to renounce the use of complex and expensive devices for weighing filled with carbon dioxide cylinders in fixed carbon dioxide fire-fighting devices and to make such control is simple, reliable and economical to implement. It is necessary first of all to note the fact that such an exhaust valve with a built-in measuring probe generates approximately the same resistance to expiration, which is not equipped with a measuring probe exhaust valve with optimal hydrodynamic characteristics. This capacitive the th probe, which has its inner measuring electrode is formed of a lifting tube, has extremely high durability and stability even when used in tanks of large capacity.

Below, some embodiments of the above described inlet valve, allowing to provide a particularly compact and reliable electrical connection of the capacitive measuring probe to the measuring circuit.

According to the first embodiment is provided by an insulating sleeve, which covers included into the inlet of the first end of the lifting tube and electrically isolates it from the conductive base of the valve. In this embodiment, there is also a contact element which is electrically isolated from the conductive base of the valve and which in the input hole, available in the base of the valve, electrically contacts the first end of the lifting tube. In contrast, the outer tube forming the second electrode of the probe electrically contacts the electrically conductive base of the valve, through which she included in an electrical circuit. The first end of the lifting tube preferably has an annular end surface forming a contact surface with an insulated contact element, and therefore to create a reliable electrical with the organisations between the isolated contact element and the lifting tube the latter need only be pressed in the axial direction of the contact element in the inlet opening, available at the base of the valve.

Insulated contact element that can be used in this first embodiment, the inlet valve preferably consists of a contact ring, the inner and outer diameters which are approximately equal inner and outer diameters of the annular end surface of the lifting tube, and an insulating ring, outer diameter greater than the outer diameter of the contact ring. This insulating ring one its end adjacent to the ledge in the entrance hole and the other end of the recess in which is fitted the landing inserted contact ring. In this embodiment, ensure a reliable contact between the lifting tube and the contact element on the surface of a large area and at the same time effectively prevents electrical short circuit.

In this first embodiment, the exhaust valve at its base is preferably a connecting channel formed in the above ledge hole, which is blocked inserted into the inlet of the insulating ring. The insulating ring in turn has an annular groove, which is made in its end adjacent to the said ledge, and with which reportedly made this ledge hole that leads into the connection channel, and the Squaw is a great hole, the exhaust from this annular groove and passing to the contact rings. In this embodiment, the contact ring first end is firmly connected insulated connecting wire, which is placed through the through hole and an annular groove in the insulating ring in the connecting channel. This annular groove prevents the cutting of this connecting wires in case of a possible turning of the contact ring, which is inserted into the inlet hole in the valve base.

The second end above the connection cable is firmly connected to the externally accessible connecting element, which is hermetically sealed and electrically insulated inserted into the hole in the base of the valve. Conductive base inlet valve provides electrical contact with the outer tube, forming the second electrode of the probe. In this case, the electrical contact between the said external tube and the valve base can be achieved by pressing the annular end of this outer tube to the annular end face of the valve seat.

In the first embodiment, the inlet valve preferably, the end insulating coupling protrudes from the hole in the base of the valve and served thereby for attaching the outer tube, forming the second electrode of the probe. In this case, samatA outer tube is preferably screwed on the specified end of the insulating coupling so that the annular end face of this outer tube is firmly pressed against the annular end face of the valve seat. Thus, such an insulating sleeve performs the function of an electrical insulator between the lifting tube and the base of the valve, the function of insulating spacers between the lifting tube and the outer tube, forming the second electrode of the measuring probe, and a function of fixing and clamping devices for the external tube. Thanks to the use of such multifunctional coupling possible to the minimum to reduce the number of separate parts required for mounting both of the tubes forming the electrodes of the probe. The insulating sleeve may further have a conductive outer wall providing an electrical connection between the valve and the outer tube. In this case it is possible to further improve the reliability of electric contact of the valve with the outer tube.

In another embodiment, the measuring electrode lifting tube is screwed into its upper end into the inlet of the available base of the valve. On the upper end of the lifting tube is put on the upper insulating sleeve. On the lower end of the lifting tube is screwed on the lower mounting sleeve, clamped in the axial direction of the outer tube, forming the second electrode of the measuring zones is a, the upper insulating sleeve. The upper insulating coupler is preferably pressed against the end wall of the valve. In a preferred embodiment, the lower mounting sleeve consists of a hollow metal core, screwed on the lower end of the lifting tube, and an insulator located between the said metal core and an outer tube forming the second electrode of the probe.

Brief description of drawings

Below the invention is described in more detail on the example of one of the variants of its implementation with reference to the accompanying drawings on which is shown:

figure 1 - schematic representation of one of the examples proposed in the invention, carbon dioxide fire devices

figure 2 is a longitudinal section used in carbon-dioxide fire-fighting device, the exhaust valve with a built-in device for determining the amount of gas loss due to leakage is connected to that cylinder valve with carbon dioxide, while the drawing shows the first embodiment of the lifting tube, made in the form of a capacitive measuring probe,

figure 3 is an enlarged image of the fragment, a prisoner in figure 2 in a frame indicated by Roman numeral I,

figure 4 is an enlarged image of an agreement for figv frame, denoted by Roman numeral II,

figure 5 is a longitudinal section made according to another variant of the lifting tube, made in the form of a capacitive measuring probe,

figure 6 is a longitudinal section of the lifting tube plane 6-6 in figure 5.

In figure 1 the position of the 10 designated filled with compressed carbon dioxide cylinder carbon dioxide fire devices. The relative volume of this cylinder filled with carbon dioxide, is, for example, 1:1,50, which corresponds to the mass fill its carbon dioxide 0,666 kg per liter of volume of the container. At -20°With the cylinder 10 is filled with liquefied carbon dioxide by 62.8%. At a temperature of +20°With the volume fraction of the liquid phase is 82%. When the temperature of 27.2°With balloon on 100% filled with liquefied carbon dioxide. Since temperature 31°With (equal to the critical temperature of carbon dioxide) cease to exist physical differences between liquid and gaseous carbon dioxide, i.e. ceases to exist, the transition between liquid and gas phases of carbon dioxide. It should be noted that the pressure in the cylinder when the temperature increased from 20°to +60°increases from 19 bar to 170 bar.

Shown in figure 1, the container 10 has proposed in the invention device designed to determine the magnitude of loss of gas sredstv is its leakage from the container 10 and the overall position 11. The structure of this device 11 includes a capacitive probe (sensor) 12, consisting of two electrodes. These electrodes pass through the entire height of the container 10 and are separated from each other by a gap, in which carbon dioxide acts as a dielectric. In this regard it should be noted that (1) at temperatures below 27,2°With the function of the dielectric in the upper part of the interelectrode gap performs gaseous carbon dioxide (at 20°With the probe 10 is immersed, for example, 82% in liquefied carbon dioxide, while the remaining 18% of its length surrounded by gaseous carbon dioxide), (2) at a temperature of from 27.2% to 31°With the function of the dielectric around the interelectrode gap performs is in a liquid state carbon dioxide and (3) at temperatures above 31°With the function of the dielectric around the interelectrode gap does carbon dioxide in the supercritical state.

The principle of operation of the device 11 based on the fact unexpectedly established fact that the capacitive measuring device allows not only the usual way to register the change in the liquid level in the container 10, but also to unambiguously correlate measurable change in capacitance of the probe 12 with the component a few percent of gas leakage from the container 10 in that case, if

(a) the container 10 is 100% filled with chodashim liquid carbon dioxide, and so a gas leak in a few percent already not accompanied by a required change in the liquid level in the container, and

(b) the temperature of the carbon dioxide exceeds the critical temperature (31° (C), and therefore carbon dioxide is in the supercritical state of the fluid, in which there is no distinction between the gaseous and liquid phases.

The practical implementation is briefly discussed above principle of operation of the device 11 preferably consists in the following. Capacitive probe 12 is connected to the measuring module 14, which measures the capacity of this capacitive electrode 12 and transmits the measurement results to the microprocessor 16. In the module 20 of the memory to which the microprocessor 16 has access, are stored calibration values for the temperature range below and above the critical temperature of carbon dioxide. Sensor 18, the temperature measured by the ambient temperature. The microprocessor 16 on the basis of the measured specified temperature sensor and calibration values for this temperature counts the number contained in the container 10 of carbon dioxide and compares this quantity of carbon dioxide with the specified content of carbon dioxide in the container. In that case, if the detected value of the loss of gas exceeds a preset value, then MIC the CPU 16 outputs a warning signal, supplied, for example, using module 22 of the light and/or sound alarm. The above scheme allows to obtain a simple device for determining the amount of gas loss due to leakage from the cylinder, allowing its use at high ambient temperatures.

Figure 2 shows the exhaust valve 30 fixed carbon dioxide fire-fighting device, which is integrated capacitive probe 12. The upper part 31 of this exhaust valve 30, which is the starting device shown in figure 2 only schematically, since it is not significant to clarify the essence of the present invention.

The exhaust valve 30 has a body 31, on the basis of 32 which is made from the outer thread 34, which this valve is screwed into the neck of the container. It should be noted that the neck of the bottles used in stationary fire-fighting devices, for screwing the base 32 of the valve provide only a inch thread W28,8×1/14 according to DIN 477, i.e. that the base 32 of the valve has a relatively small size.

Through the base 32 of the valve passes the inlet 36, which is coaxially he is lifting tube 38. This lifting tube 38 reaches almost to the bottom of the container. It should be noted that in the stationary is carbon dioxide fire-fighting device, the inner diameter of the inlet 36 to the base 32 of the valve and the lifting tube 38 must be at least 12 mm, so when casting fire devices in the action of the pressure loss in the flow of gaseous fire extinguishing means passing through the lifting tube 38 into the exhaust valve 30 remained at a low level.

Shown in figure 2, the exhaust valve 30 of the electrodes of the capacitive electrode 12 is formed by lifting the tube 38 and covering the outside of and separated from it interelectrode gap 42 of the outer tube 40. In other words, such a capacitive probe 12 has two coaxial tubular electrodes, thus lifting tube 38 forms an internal electrode, and the tube 40 forms an external electrode. Annular interelectrode gap 42 between both tubes 38 and 40 forming the electrodes of the probe, is filled in liquid, gaseous or supercritical state of carbon dioxide, which acts as the dielectric separating one from the other both of the electrode formed by the tubes 38 and 40.

On lifting the handset 38 is wearing two ring spacers 44, 44' of insulating material, each of which is held in position by a pair of spring retaining rings 46, 46' and which have a corresponding width of the interelectrode gap 42 wall thickness and provide continuity annular interelectrode gap 42 between both the electrode is mi along the entire length of the probe 12. It should be noted that such spacers 44, 44' are local flats 45, 45'to ensure the delivery of carbon dioxide along the spacers 44, 44' in the interelectrode gap 42. Position 48 in the drawing, is made in the upper end of the outer tube 40 of the valve vent hole which provides a constant equalization of the liquid levels and pressures between interelectrode gap 42 and the rest of the cavity of the container.

Below with reference to figure 3 for more detailed described mounting of the probe 12 to the base 32 of the valve. On the upper end of the lifting tube 38 is screwed insulating sleeve 50. This insulating sleeve 50 has at its upper end, the first outer thread 52, which it is screwed into the internal thread 52' in the hole made in the base 32 of the valve. The lower end of the insulating coupling 50 protrudes from the hole in the base 32 of the valve and provided with a second external thread 54. On this second external thread 54 to the stop is screwed the upper end of the outer tube 40, the end face 56 which is pressed against the end face 58 of the conductive bases 32 of the valve and which thereby electrically in contact with the ground. It should be noted that the insulating sleeve 50 ultimately performs the function of an electrical insulator between the lifting tube 38 and the base 32 of the valve, the function of insulating spacers between the lifting of labour is coy 38 and the outer tube 40 and the function of fixing and clamping devices for the outer tube 40. Thanks to the use of such multifunctional coupling possible to the minimum to reduce the number of separate parts required for mounting both of the tubes 38, 40 forming the electrodes of the probe. It should also be noted that the insulating sleeve 50 equally may have a conductive outer wall, providing electrical connection between a base 32 of the valve and the outer tube 40. In this case it is possible to further improve the reliability of electric contact of the base 32 of the valve with the outer tube 40.

Position 60 in the drawing, the contact ring, the inner and outer diameters which are approximately equal to those end surface 62 of the lifting tube 38. This contact ring 60 by fitting the landing inserted into the recess in the first end of the insulating ring 64. This ring whose inside diameter equal to the inner diameter of the contact ring 60 and its outer diameter larger than the outer diameter of the contact ring 60, adjacent its second end to the ledge 66 at the inlet port 36. When screwing in the lifting tube 38 by an insulating coupling 50 in the base 32 of the valve end of this lifting tube 38 is firmly pressed against the contact ring 60 that provides a reliable electrical connection between the lifting tube 38 and contact the m ring 60. Summing up the above, it remains to note that in the above-described structure between the lifting tube 38 when it is screwed into the inlet 36 to the base 32 of the valve, and the contact ring 60 is secured to the contact on the surface of a large area, with the contact ring 60 by an insulating ring 64 is securely isolated from the conductive base 32 of the valve.

Position 70 in the drawing, is made in the base 32 of the valve connecting channel formed in the ledge 66 of the hole, which is covered by an insulating ring 64, which is inserted into the inlet opening 36. The insulating ring 64 has an annular groove 72, which is made in its end adjacent to the ledge 66, and which is reported to the host in the connection channel 70 hole. In the insulating ring 64 is executed next, a through hole 74, which departs from the annular grooves 72 and passes to the contact ring 60. With the contact ring 60 of the first end is firmly connected insulated connecting wire 76, which is placed through the through hole 74 and an annular groove 72 in the insulating ring 64 in the connecting channel 70. This annular groove 72 prevents the cutting of this connecting wire 76 in the event of a possible turning of the contact ring 60 in the input hole 36.

Further design features prom is lapena explained with reference to figure 4. Connecting wire 76 is firmly connected with the rod connecting element 78. This coupling element is hermetically inserted into the conical insulating sleeve 80, which in turn is hermetically sealed using a clamping screw ring 82 in a conical hole 84 in the valve body.

Position 90 figure 4 indicated a printed circuit Board with an electronic circuit placed in the chamber 92, existing in the valve body. This camera 92 is closed by a threaded plug 94, which simultaneously fixes the circuit Board 90 in the chamber 92. Printed circuit Board 90 of the connecting element 78 is connected with the lifting tube 38, which, as indicated above, forms a first electrode of the capacitive measuring probe 12. Through the conductive valve housing printed circuit Board 90 is connected with the outer tube 40, which, as indicated above, forms the second electrode of the capacitive measuring probe 12. For connecting the circuit Board 90 to the external circuits, respectively, to external power sources, serves as the connector block 96 and the radiating connecting wire 98, which is tightly inserted into the connection socket in the threaded plug 94.

On the circuit Board 90 is placed above the measuring module 14, a microprocessor 16, a sensor 18, the temperature and the memory module 20. A warning signal is issued when rasm is provided above conditions by the microprocessor, is transmitted through the connecting wire 98, or in an external module alarm or Central control network.

Shown in figure 5 and 6 embodiment, the lifting tube 38' one of its end screwed into the inlet 36 to the base 32 of the valve that provides direct electrical contact between the base 32 of the valve and lifting the tube 38'. Position 110 in the drawing, the upper insulating sleeve, which is mounted on the lifting tube 38' and which end 112 adjacent to the end face 58 of the base 32 of the valve. The outer tube 40', forming one of the electrodes of the probe is mounted one end to the lower end of the upper insulating couplings 110 and adjacent its upper end to the ledge 114, available at the top of the isolation coupling 110. On the lower end of the lifting tube 38' is screwed on the fixing sleeve 116. This mounting sleeve has a cylindrical end 118 that is inserted in the lower end of the outer tube 40'. When tightening the fastening of the coupling 116 to lock the annular pressure surface 120 abuts against the bottom end of the outer tube 40', compressing the latter in the axial direction of its upper end face to a ledge 114 of the upper insulating couplings 110, which, in turn, its face 112 tightened against the end wall 58 of the base 32 of the valve.

The lower mounting sleeve 116 preferably consists of a hollow metal core 122 with wew is Anna thread for screwing on the lifting tube 38' and of an insulating couplings 124, which is mounted on the metal core 122 and prevents electrical contact between the outer tube 40 and this metal core 122. Instead of using insulating couplings 124 in another embodiment, the metal core 122 can also apply a coating of insulating material. According to another variant, instead of the compound of the mounting sleeve with insulating sleeve 124 can be used fastening the coupling is fully made of insulating material. However, the option requires the use of a compound of the mounting sleeve with a metal core 122, allows us to give the whole design higher mechanical strength with significant temperature fluctuations and is therefore preferred. Similarly, shown in figure 2 option to maintain a constant annular interelectrode gap 42 between the two tubes along their entire length is provided at least one annular spacer 44 of insulating material.

Position 130 figure 5 marked the locking pin or lever that is screwed into the hole in the end face 58 of the base 32 of the valve and enters the notch in the upper insulating sleeve 110, preventing it from turning. For laying electric wires connected to the measuring probe, it is preferable to use hollow locking pin or Phi is Sator 132. This insulated connecting wire 134, passed through conduit 136 in the base 32 of the valve and through the hole in the latch 132, is performed outside the barrier coupling 110 in the recess 138, where it is electrically connected to the outer tube 40', forming one of the electrodes of the probe.

Positions 140, 142 figure 5 indicated the side holes in the lower and upper ends of the outer tube 40'. Through these holes 140, 142 interelectrode gap 42 directly communicates with the internal space of the container.

In conclusion, it should be noted that the present invention is not limited to only the above option for its implementation, defining the magnitude of the loss of carbon dioxide gas due to leakage from a cylinder of carbon dioxide fire-fighting devices, and, obviously, also allows its use as applied to gases other properties similar to the properties of carbon dioxide.

1. Carbon dioxide fire extinguishers having a container (10) for storage of carbon dioxide as an extinguishing agent and device for determining the amount of gas loss due to leakage from the cylinder (10), characterized in that the device for determining the amount of gas loss due to leakage from the container (10) has a capacitive is e measuring device (11), calibrated for the temperature range below and above the critical temperature of carbon dioxide.

2. The device according to claim 1, having a capacitive probe (12)passing through the entire height of the container (10), measuring unit (14) for measuring the capacity of the capacitive electrode (12), the microprocessor (16)to match the measured capacitance of the capacitive measuring probe with the corresponding amount of gas loss due to leakage from the cylinder, and means for generating the warning signal, if detected by the microprocessor, the amount of gas loss is greater than some specified value.

3. The device according to claim 2, having a sensor (18) and temperature module (20) memory that stores calibration values for the temperature range below and above the critical temperature of carbon dioxide, the microprocessor (16) to correlate the measured changes in the capacitance of the capacitive measuring probe with the corresponding amount of gas loss due to leakage from the container reads these calibration values based on the measured temperature.

4. The device according to claim 1, 2 or 3, with the exhaust valve (30) with a base (32), which is screwed on the container (10) with carbon dioxide and which has an inlet (36), the lifting tube (38), which is included in the input hole (36)is the base (32) of the valve, and that when casting fire device provides the incoming stream of carbon dioxide gas in the exhaust valve (30), and capacitive probe (12) with two coaxial electrodes with the first electrode formed of a lifting tube (38)and the second electrode is formed covering this lifting tube (38) on the outside and separated from it interelectrode gap (42) of the outer tube (40).

5. The device according to claim 4, characterized in that is provided by an insulating sleeve (50), which covers included in the input hole (36) the end of the lifting tube (38) and electrically isolates it from the conductive base (32) of the valve, and a contact element (60, 64), which is located in the inlet hole (36)in the base (32) of the valve, and which is electrically isolated from the conductive base (32) of the valve and electrically in contact with the first end of the lifting tube (38), and the outer tube (40), forming the second electrode of the probe electrically contacts the conductive base (32) of the valve.

6. The device according to claim 5, characterized in that the lifting tube (38) has an annular end surface (62)forming a contact surface with an insulated contact element (60, 64).

7. The device according to claim 6, characterized in that the insulated pin is ctny element (60, 64) consists of the following parts: from the contact ring (60), the inner and outer diameters which are approximately equal inner and outer diameters of the annular end surface (62) lifting tube (38), and of an insulating ring (64), outer diameter greater than the outer diameter of the contact ring (60) and which one its end adjacent to the ledge (66) in the input hole (36), and at the other end of the recess in which is fitted the landing inserted contact ring (60).

8. The device according to claim 7, characterized in that provided is made in the base (32) of the valve connecting channel (70)forms a ledge (66) hole, which is covered by an insulating ring (64), annular groove (72), which is made in the end face of the insulating ring (64)adjacent to the specified ledge (66), and which reportedly made in the ledge (66) hole that leads into the connection channel (70), made in the insulating ring (64) through hole (74)extending from the ring groove (72) and passing to the slip rings (60), and insulated connecting wire (76), which its first end is firmly connected with the contact ring (60) and which is placed through the through hole (74) and an annular groove (72) in the insulating ring (64) in the connecting channel (70).

9. The device according to claim 8, characterized in that the warning is identified externally accessible first coupling element (78), which is hermetically sealed and electrically insulated inserted into the hole in the base (32) of the valve and which is firmly connected to the second end of the connecting wires (76).

10. Device according to any one of pp.5-9, characterized in that the outer tube (40), forming a second electrode of the measuring probe has a circular end face (56), which is pressed against the annular end face (58) of the base (32) of the valve.

11. The device according to claim 10, characterized in that the end of the insulating sleeve (50) protrudes from the hole in the base (32) of the valve and the outer tube (40), forming a second electrode of the probe is screwed on the end of the insulating sleeve (50) in such a way that the annular end face of this outer tube is firmly pressed against the annular end face of the base (32) of the valve.

12. Device according to any one of pp.5-11, characterized in that the insulating sleeve (50) is screwed into the inlet (36).

13. The device according to claim 10, characterized in that the first end of the insulating sleeve (50) is screwed into the inlet (36)and the second end of the insulating sleeve (50) is from the inlet (36)and outer tube (40), forming a second electrode of the probe is screwed on the second end of the insulating sleeve (50), and an insulating sleeve (50) has an electrically conductive outer wall, providing electrical connection between a base (32) of the valve and the outer tube (40).

14. The device is in any of the pp.5-13, characterized in that the lifting tube (38) screwed into an insulating sleeve (50).

15. The device according to claim 4, characterized in that the lifting tube (38) is screwed into its upper end in an inlet opening (36)in the base (32) of the valve, at the upper end of the lifting tube (38') is wearing a top insulating sleeve (110), and the lower end of the lifting tube (38') is screwed on the lower mounting sleeve (116), clamped in the axial direction of the outer tube (40'), forming the second electrode of the probe to the upper insulating sleeve (110).

16. The device according to item 15, wherein the upper insulating sleeve (110) pojate to the end face (58) of the base (32) of the valve.

17. The device according to item 15 or 16, characterized in that the lower mounting sleeve (116) consists of a hollow metal core (122), screwed on the lower end of the lifting tube (38'), and an insulator located between the said metal core (122) and outer tube (40'), forming the second electrode of the probe.



 

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The invention relates to mechanical engineering, in particular to systems that supply gas of the internal combustion engine

The invention relates to a device for optical observation and can be used in many sectors of the economy in devices working under pressure

FIELD: fire-fighting, particularly special adaptations of indicating, measuring, or monitoring equipment.

SUBSTANCE: fire-fighting device comprises cylinder filled with fire-extinguishing composition and means to indicate gas losses owing to gas leakage from the cylinder. The means comprises capacitive sensor calibrated in temperature range below and above critical carbon dioxide temperature.

EFFECT: increased reliability of gas leakage determination without cylinder weighting.

17 cl, 6 dwg

FIELD: storing or distributing gases or liquids.

SUBSTANCE: station comprises pressure-tight vessel filled with liquefied hydrocarbon gas, communications for connection of the vessel with the gas distributing column through the actuating mechanisms, and system for control of gas leakage. The system for control of the gas leakage comprises the device for control of the weight of the vessel with the pickup of weight, unit for control of the flow rate of liquefied hydrocarbon gas, converter for converting the electric signal to the frequency characteristic, adder, analyzer, and unit for control of the actuating mechanisms. The output signal from the weight pickup is fed to the input of the converter. The outputs of the flow rate unit is connected with the first input of the adder whose second input receives the signal from the converter. The output of the adder is connected with the first input of the analyzer whose second input is connected with the output of the converter. The output of the analyzer is connected with the unit for control of actuating mechanisms.

EFFECT: enhanced safety and reliability.

23 cl, 2 dwg

FIELD: transport engineering; vehicles powered by engines operating on gaseous fuel.

SUBSTANCE: proposed multiway valve has housing with intake tubular channel connected by one end with liquid gas charger, and by other end, with tank and outlet tubular channel equipped with devices to control flow of liquid gas flow into tank and from tank. Valve contains also electronic level pickup installed in tank which is connected both with cutoffs of inlet and outlet gas flows and with tank charging level indicator controlled by control unit. Two shutoff valves are installed along intake tubular channel, respectively, first and second ones, upflow and downflow relative to intake electromagnetic valve. Pressure pickup is arranged downflow relative to charger and upflow relative to first shutoff valve. Flow limiter, two-position manually controlled valve and outlet electromagnetic valve are installed along outlet tubular channel.

EFFECT: improved accuracy and reliability of checking level of tank filling, and safety of device.

3 cl, 2 dwg

FIELD: measurement instrumentation.

SUBSTANCE: fluid-tight housing of the tank is provided with indicating liquid level gage, lower throat with valve for liquefied hydrocarbon gas (LHG) drain and loading, upper throat with valve for air drain from the tank and inert gas delivery during LHG drain from the tank. The calibrated tank is also provided with pressure gauge, thermometer and additional indicating liquid level gage installed in the lower throat and regulable with safety relief valve designed for stable pressure (i.e. LHG vapor pressure) maintaining.

EFFECT: increasing of LHG volume measurement accuracy in the prescribed temperature range.

2 dwg

FIELD: fire extinguishing equipment.

SUBSTANCE: group of inventions is proposed including method and device to control the mass of gaseous fire extinguishing substance (GFES), containing carbonic acid, in a cylinder of a gas fire extinguishing module. The method involves introducing nitrogen in the amount of 5-7% of the carbonic acid weight to the cylinder with the carbonic acid, then a measurement instrument is calibrated, contact of the measurement instrument sensor with the GFES is provided for and current pressure of compressed or liquefied gas mixture in the cylinder as well as current temperature of the gas mixture in the cylinder are measured. Afterwards with the help of a microprocessor the current values of gas mixture pressure in the cylinder are compared to the calibrated pressure values depending on the measured current temperature of the gas mixture in the cylinder. The comparison results help evaluating the losses of GFES due to its leakage from the cylinder depending on the measured temperature. In case the revealed value of the GEFS losses exceeds a certain specified value, a warning signal is produced for restoring the operability of the gas fire extinguishing module. The above method can be implemented by a special device for the control over the GEFS mass in the cylinder of the gas fire extinguishing module. It comprises a unit with a metering device to supply nitrogen to the cylinder, a measurement instrument with a pressure sensor for compressed or liquefied gas mixture in the cylinder which is contacting the GEFS, a temperature sensor for the compressed or liquefied gas mixture in the cylinder, a microprocessor with a memory block to store calibration data of the pressure sensor signals, and a signaling device. The microprocessor is electrically connected to the pressure sensor, temperature sensor and signaling device.

EFFECT: providing for reliable control of GEFS leakage up to 5% of the filled amount, improving reliability of the gas fire extinguishing module operation, increasing its workability, reducing manufacturing costs and improving operation conditions due to simplifying GEFS mass control device design, increasing fire extinguishing efficiency due to providing for fire extinguishing system homogenisation.

2 cl, 1 dwg, 2 tbl

FIELD: measuring technology.

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EFFECT: application of the invention allows improving accuracy of determination of the remained amount of liquid hydrogen.

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FIELD: machine building, liquid storing.

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EFFECT: creation of such tank for storing of cryogenic liquids, which would provide increasing of precision of measurements of amount of cryogenic liquid.

1 dwg

FIELD: machine building.

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25 cl, 17 dwg

FIELD: machine building.

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EFFECT: simpler device design and minimisation of dimension and weight characteristics; provision of adjustable oxygen inflow from air to the above said container.

1 dwg

FIELD: machine building.

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EFFECT: simpler device design and minimisation of dimension and weight characteristics.

1 dwg

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