Safety valving device

FIELD: automatic control.

SUBSTANCE: device comprises housing, lid, adjusting spring, control members for adjusting specified parameters, and chamber that receives the diaphragm. The diaphragm divides the space of the chamber into the above-diaphragm space connected with the gas pipeline to be controlled and under-diaphragm space connected with the atmosphere. The diaphragm is mounted on the movable rod. The rod passes through the diaphragm at its center and causes the pusher to move. The pusher is connected with the second rod that is perpendicular to the first rod and connected with the third rod. The shutoff valve is mounted on the third rod. The rod of the shutoff valve is oriented parallel to the rod of the diaphragm. The second chamber of the device is positioned in the space between the lid and housing from the side of the lid. The second chamber receives the second diaphragm that is shaped similar to the first diaphragm and separates the second chamber into above-diaphragm space and under-diaphragm space. The under-diaphragm space is in communication with the atmosphere and defines a space between the lid and the second diaphragm. The second diaphragm is mounted on the same rod as the first diaphragm for permitting the above-diaphragm spaces of both of the chambers to be interconnected by means of a passage made in the hollow rod. The second chamber is defined by the cylindrical hollow housing mounted on the lid and receives the a baffle at its center provided with diaphragm for permitting the rod of the diaphragms to pass through them. The rod of the diaphragms is connected with the pusher by means of a bushing. The bushing has side passage oriented parallel to the diaphragms for connection of the above-diaphragm spaces.

EFFECT: enhanced reliability and precision.

2 dwg

 

The claimed technical solution relates to gas safety devices and is designed to automatically stop the flow of gas in case of increase or decrease of the controlled pressure in excess of the specified limits.

Known safety shut-off valves (Shur I.A. gas regulating stations and installations. - M.: Nedra, 1985, s-123). These valves have a valve body with a saddle, which when triggered overlaps disc plug with soft seal. Increase or decrease of the controlled pressure in excess of the specified limits leads to the displacement of the membrane and, consequently, to the landing of the plunger on the saddle and stop the passage of gas.

However, they are characterized by a large active area of the working membrane and of large dimensions.

Also known shut-off valves (Revin A.I. and other control and safety equipment for gas supply systems. Publishing house of Saratov state University, 1989, p.106-109), which consist of the body in which the rotary axis is rigidly fixed thereto shut-off valve and the rotary lever. On the case of fixed control device.

However, they are characterized by a large active area of the working membrane that gives the valves a wide range of pressure.

Closest to tawlae the WMD technical solution is a safety-locking device, built-in gas pressure regulator type GGD-20 (same as s-82). It is illustrated with Figure 2, in which positions 1-17 marked nodes, and includes a housing 1, a cover 2, the adjustment of the springs 3, 4, the adjusting elements 5, 6 to preset parameters, the chamber between the housing 1 and the cover 2, is installed in the cell membrane 7, which divides the space of the camera on namebrand and podobrannyy cavity, the shaft 10 has mounted on the pusher 13 and connected with the second rod 14, which engages with the rod shut-off valve 15, which is fixed to the shutoff valve 16 and a spring 17. The numbering of the positions indicated in exact accordance with positions of the claimed device.

However, this technical solution is characterized by a relatively narrow range of pressure resulting from a small area of the membrane. When the pressure is below to 0.002 MPa tripping device loses, first, the accuracy of response due to the fact that the force on the membrane becomes comparable with the mechanical friction losses in the elements of a safety-locking device and, secondly, as a consequence of the first - operability. To extend the range of pressure below 0.002 MPa without loss of precision operation is required to increase the active area of the membrane, which is priemlemim due to the increasing diameter of the membrane chamber.

The objective of the proposed technical solution is to increase the accuracy of actuation tripping device at pressures below of 0.002 MPa.

The essence of the invention lies in the fact that in the safety gas shutoff device, comprising a housing, a cover, adjusting spring, adjusting elements for preset parameters and the chamber between the housing and the cover installed in her diaphragm, dividing the space of the camera on namebrand camera connected to a controlled gas pipeline, and podobrannyy cavity connected with the atmosphere, a diaphragm mounted on the movable rod passing through it in the center and driving the plunger associated with the second rod is positioned perpendicular to the first rod, the second rod is connected with the third shaft, on which is placed the valve and the stem shut-off valve is oriented parallel to the shaft of the membrane, in the space between the cover and the housing side cover entered the second chamber, inside which is placed the second membrane, repeating the first configuration, and dividing the second chamber similar to the first above - and podobrannyy cavity, the latter being connected to the atmosphere, forming a cavity between the cover and a second membrane, the second membrane is installed on the same shaft as the first membrane, with the possibility soy is inane namebrand cavities both cameras due to the channel in the hollow stem, the second chamber is formed of a cylindrical hollow housing mounted on the cover, and inside, in the Central part, the partition is placed on the diaphragm with the possibility of passage through the stem of the membranes associated with the plunger using a sleeve having a lateral channel, oriented parallel to the membrane to connect namebrand cavities.

In addition, in the inventive safety gas shutoff device may be located in the second chamber of the supporting sleeve having a side channel that serves as a continuation of the channel in the stem for connection namebrand cavities cameras, and the height of the sleeve is limited by the distance between the second diaphragm and the diaphragm.

The proposed solution is illustrated using Figure 1 (the proposed solution) and 2 (closest equivalent), which is a cross sectional view of the safety-locking device, where the positions 1-17 shows:

1 - body; 2 - cover; 3, 4 - adjusting spring; 5, 6 - adjusting elements; 7, 9 - membrane; 8 - the case of the second camera; 10 - rod membranes - the first rod; 11 - aperture; 12 - Bush; 13 - pusher; 14 - the second rod; 15 - rod shut-off valve - the third rod; 16 - off valve; 17 - spring; 18 - bushing support; 19 - channel in the bushing support.

The inventive device includes a housing 1, a cover 2, the adjustment of the springs 3, 4, the adjusting elements 5, 6, chamber And between what obosom 1 and the cover 2, installed in the cell membrane 7, which divides the space of the camera on namebrand and podobrannyy cavity. Between the housing 1 and the cover 2 has a housing 8 of the second chamber, in the form of a hollow cylinder, repeating the outer contours of the housing 1 and the cover 2 in this place and inside the wall with a Central hole. The second camera B are the second membrane 9, which divides the chamber similar to the first membrane 7 on namebrand and podobrannyy cavity. Both membranes 7 and 9 mounted on the rod membranes - the first rod 10, which has a Central hole channel for connection namebrand cavities. To the wall of the second chamber B is fixed aperture 11 in the form of a rubber gasket fixed to the first rod 10 to the piston rod of the membranes. Membrane 7, 9 are connected with the sleeve 12, which, as the rod 10, the Central hole and the side channel, with the plunger 13, which is connected with the second rod 14 located perpendicular to the rod 10. This is the second rod 14 communicates with the third rod - rod shut-off valve 15, which is oriented parallel to the shaft of the membranes 10 and on which is placed the shutoff valve 16. The spring 17 serves to move the shut-off valve 16. For durability of the claimed design in the space of the second chamber B in namebrand cavity entered liners is a (reference) 18. It is mounted on the hollow stem of the membranes 10 and its height is limited by the distance between the second membrane 9 and the diaphragm 11. The support sleeve 18 has a side channel 19 that serves as a continuation of the channel in the stem of the membranes 10 to connect namebrand cavities cameras.

Works safety-locking device as follows.

When applying controlled pressure into the cavity of the chamber and the cavity of the chamber B, related to each other via a channel in the piston rod 10 and the sleeve 12, the respective adjusting pressure, the end of the rod 14 extends over the protrusion of the stem shut-off valve 15 and the valve 16 is in the ready state. If the controlled pressure increases beyond the configured limit, then the sum of the forces acting on the membrane 7 and 9, exceeds the force of the adjustment spring (4). Membrane 7, 9 together with the plunger 13 is moved down and remove the rod 14 out of engagement with the rod shut-off valve 15, which under the action of the spring 17 begins to move, and the valve 16 closes the gas inlet.

If the controlled pressure drops below the setting pressure, and in this case, the membrane 1, 9 together with the plunger 13 to move up and take the rod 14 out of engagement with the rod shut-off valve 15, which under the action of the spring 17 begins to move. The valve 16 closes the gas inlet.

Feasibility the claimed condition the device is in achieving high precision actuation, including ranges below of 0.002 MPa, and, as a consequence, protection of pipelines at unexpected rise or fall in pressure after the regulator in excess of specified limits without significantly increasing the dimensions of the safety shut-off devices. The existing equipment, carrying out these tasks, 1.5 times or more larger in size and mass from the proposed technical solutions.

1. Safety gas shutoff device, comprising a housing, a cover, adjusting spring, adjusting elements for preset parameters and the chamber between the housing and the cover installed in her diaphragm, dividing the space of the camera on namebrand camera connected to a controlled gas pipeline, and podobrannyy cavity connected with the atmosphere, a diaphragm mounted on the movable rod passing through it in the center and driving the plunger associated with the second rod is positioned perpendicular to the first rod, the second rod is connected with the third shaft, on which is placed the valve, and the stem shut-off valve is oriented parallel to the rod membrane, characterized in that it is in the space between the cover and the housing side cover second chamber, inside which is placed the second membrane, repeating the first configuration, and dividing the second camera is similar to the first above - and podobrannyy cavity, the latter is connected with the atmosphere, forming a cavity between the cover and a second membrane, the second membrane is installed on the same shaft as the first membrane, with the possibility of connection namebrand cavities both cameras due to the channel in the hollow rod, the second chamber is formed of a cylindrical hollow housing mounted on the cover, and inside, in the Central part, the partition is placed on the diaphragm with the possibility of passage through the stem of the membranes associated with the plunger using a sleeve having a lateral channel, oriented parallel to the membrane to connect namebrand cavities.

2. Safety gas shutoff device according to claim 1, characterized in that the second camera in adminpanel cavity in the hollow stem mounted sleeve having a side channel that serves as a continuation of the channel in the stem for connection namebrand cavities cameras, and the height of the sleeve is limited by the distance between the second diaphragm and the diaphragm.



 

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