Device for determining content of undissolved water in service fluids

FIELD: measurement equipment.

SUBSTANCE: portion of controlled fluid is supplied to reservoir 1 through flow control 10 and inlet nozzle 2, which is heated by vapour generation of non-dissolved water. Acoustic waves occur at breakage of the cover with vapour, which are converted by means of acoustic receiver 5 to electric signals, which are supplied through amplifier 7 and counter 8 to indicator 11. Timer 9 controls counter 8 and flow control 10. Reservoir 1 is closed with cover plate 4, inside which cone insert 6 is located.

EFFECT: simpler design and higher measurement accuracy.

2 cl, 1 dwg

 

The invention relates to measuring technique and can be used for testing insulating and lubricating fluids, low-octane combustible materials with low viscosity, such as transformer oils, lubricating oils, steam turbines and compressors, diesel fuel.

A device (Ivanov V.S. guidance on the operation of the transformer oil. Meters, Energy, 1966, p.86)containing the heater and the capacity to sample the fluid in which acoustic signals upon evaporation of undissolved water perceptible, so the result of the test is subjective, and to determine the amount of undissolved water in the sample impossible.

A device for control of undissolved water in the flow of the fluid (RF patent No. 2256901 on .G01N 25/56, publ. in 2004).

The device comprises a measuring chamber, consisting of emitter luminous flux and the photodetector, positioned in the horizontal plane.

Thus the liquid flow moves perpendicular to this plane. The measurement of the intensity of the light flux from crossing its mechanical particles and water droplets moving with a constant speed, allows to determine the size of these particles. The fluid before it enters the measuring chamber is heated to a temperature at which steam through the size of water droplets increases, that increases the resolution of the meter and provides control of water droplets of a small size. The working channel of the measuring chamber has a small cross-section, which reduces the probability of passing multiple particles, but limits the flow of liquid and reduces the performance in the tests. Tests on this unit are limited by the transmittance of the liquid: for control of dark liquids requires a light source of high power, and when the transparent liquid water droplets in the fluid flow is not detected.

To heat from the heated liquid is transferred to the measuring chamber, is used for additional cooling, and the flow of fluid from the photomultiplier elements must be isolated. This complicates the design of the device.

A device (EN 2125259 G01N 25/50, publ. in 1999, accepted for the prototype), providing control of undissolved water in the sample or the flow of the fluid.

The device includes a tank, a heater, a flow regulator, inlet and outlet fittings, the electronic unit. Variants of the device uses a heat exchanger and a second aperture, and the electronic key implements different methods of processing and displaying an electrical signal.

Initial value for the dimension is moving diaphragm is we under the action of acoustic waves, educated at the transition to steam water droplets. Aperture is a design element (bottom) capacity and must have sufficient mechanical strength, and this affects its elastic properties. Acoustic waves caused by boiling of water droplets of a small size, do not create the movement of the diaphragm sufficient to obtain an electrical signal. When testing such a drop is not detected. This reduces the measurement accuracy. The method used serial conversion of acoustic pressure waves into mechanical motion of the diaphragm and further into an electrical signal complicates the design and increases the accuracy of the measurements.

Pre-heating fluid in the heat exchanger creates a significant temperature gradient by volume capacity which reliable results can be obtained for samples that occupy is not the whole but only a part of the vessel, which leads to inefficient usage.

The greater density of the structural elements difficult removal of the condensed water, and return to the sample part of the condensed water distorts the measurement results, and for maintenance cleaning of structural elements in contact with the heated fluid, causes certain difficulties.

The technical result of the invention, the panel is of the construction and increase the accuracy of the measurements.

The technical result in the implementation of the invention is achieved in that in a device for determining the content of undissolved water in technical liquids containing vessel with inlet and outlet fittings, amplifier, counter, timer, indicator, flow control and heat insulation, according to the invention additionally introduced cover from a material with low thermal conductivity and acoustic receiver mounted in the lid, and the input socket is placed on the bottom of the tank and the outlet fitting is located at the top of the tank on its side wall, and the container is made of material with high electric resistance, and the output of the acoustic receiver via the amplifier is connected to the first input of the counter, the second input is connected to the first output of the timer, and the second output of the timer is connected with the control circuit of the flow regulator, and the output of the meter is attached to the indicator, while for heating the liquid source supply is connected to the ends of the container.

Additional technical result is also achieved in the case where the inner side of the cover has the shape of a truncated cone, the bottom of which rests on the upper edge of the tank, and the upper base equal to the sensor element acoustic receiver, while the inside of the lid attached the and insert in the form of a truncated cone, the bottom base which rests on the upper edge of the vessel and the area of the upper base of the cone insert is greater than or equal to the area of the sensitive element of the acoustic receiver, the height of the conical insert does not exceed half the thickness of the cover and the surface of the conical insert is uniformly perforated.

In the inventive device converts acoustic waves into an electrical signal directly, without intermediate transformations.

For heating the sample fluid power source connected to the ends of the vessel, and when the current flows the body of the vessel is heated, and heat due to the heat transmitted to the fluid inside the tank. Therefore, special heating coil, covering the bottom of the tank, as in the prototype, is not needed. Moreover, when heated housing capacity by the flowing current is provided by direct contact of the heated vessel wall and the liquid and increases the area of heat transfer. Due to this decrease and increases the service life of the device.

Cover with internal perforated insert reduces the amount of condensed water returning to the controlled sample, and the low thermal conductivity of the cover material protects the acoustic receiver from thermal overheating.

The selected dimensions of the conical insert answer most economy which ranks variant design, since the height of the perforated insert, equal to half tosini caps, optimum ratio of condensed and removed from the chamber water. At a lower altitude perforated inserts due to the greater slope of the side wall of force, restraint drop on the surface, less weight drops and drops can be returned to the sample. This increases the measurement error.

At the greater height of the conical insert moisture condensation occurs not only on the surface of the conical insert, but also on the sensitive element, an acoustic receiver, and to protect it from moisture requires additional proofing.

This complicates the device, reduces the input signal and reduces the sensitivity of the device, which ultimately reduces the accuracy of the measurements.

The invention is illustrated in the drawing, which presents a structural diagram of an apparatus for determining the content of undissolved water in technical liquids.

The device comprises a container 1 made of a material with a large electric resistance, the bottom of which is placed inlet port 2. In the upper part of the container 1 in its side wall has an output socket 3. Capacity top 1 is closed by the cover 4 of heat-insulating material in the Central part where the acoustic receiver 5. The interior of the cover 4 them the no form of a truncated cone.

On the upper edge of the tank 1 is installed perforated insert 6 in the form of a truncated cone. The power source for heating the tank 1 is connected to its ends.

The output of the acoustic receiver 5 connected to the amplifier 7, the output connected to the first input of the counter 8, the second input of which is connected to the first output of the timer 9. The second output of the timer 9 is connected to the flow regulator 10. The output of the counter 8 is connected to the indicator 11. The outside of the container 1 is closed by insulation 12.

The device operates as follows.

The flow of the fluid enters through an inlet fitting 2 into the container 1. After filling the tank 1 fluid inlet port 2 is blocked by the flow regulator 10. After filling the tank 1, the liquid is heated from the power source connected to the ends of the container 1. As heat and increase the internal energy of each drop of water begins the process of evaporation and increasing temperature steam in the shell spherical shape, increasing in size. When the vapor pressure inside the shell will force exceeds the surface tension of membranes, rupture of membranes, giving rise to fluid damped acoustic waves, the initial amplitude of which depends on the size of the sphere of the bursting of the bubble, therefore, of the volume of the drops of water from which the image is also a bubble.

Acoustic waves in the fluid quickly disappear, and the probability of applying multiple acoustic waves from the gap of different bubbles small. So we can assume that each drop corresponds to one acoustic wave. Acoustic waves are received by the acoustic receiver 5, the output signals which are amplified by the amplifier 7.

The inner surface of the cap 4 is made conical, so the cover 4 plays the role of a horn, concentrating the audio stream to the sensor, the acoustic receiver 5.

Water vapor due to the temperature difference condense on the inside of the lid 4. Condensed water droplets can not return to the fluid sample, as this prevents the perforated cone insert 6 is permeable to vapor and impermeable to water. Through holes water vapor is supplied to the cover, and the condensed water droplets are deposited on the cover 4, drain down and going at the junction of the base of the conical insert 6 and the cover 4. Remove water by removing the cover 4 of the tank 1.

From the output of the amplifier 7 electrical signal at the first input of the counter 8, which converts the amplitude of the electrical signals into a sequence of pulses to the second input of the counter 8 receives the signal from the timer 9, which defines the measurement time of the counting pulses. From the output of the counter 8 is even pulses arrive on indicator 11.

A measured quantity of undissolved water is determined by the volume contained in the tank 1, and to translate the results of the monitoring to other volumes, such as working volume of the tank in operation, should the measurement result in the vessel 1 multiplied by the ratio of the volumes of the working tank and the container 1 of the device.

Capacity utilization as a heater for the liquid samples, as well as the immediate impact of the stream of acoustic waves in the acoustic receiver greatly simplifies the design and improves the accuracy of the measurements.

Experimental studies have shown that the measurement accuracy of the content of undissolved water in the claimed device is increased by 10-15%.

1. Device for determining the content of undissolved water in technical liquids containing vessel with inlet and outlet fittings, amplifier, counter, timer, indicator, flow control and heat insulation, characterized in that it additionally introduced cover from a material with low thermal conductivity and acoustic receiver mounted in the lid, and the input socket is placed on the bottom of the tank and the outlet fitting is located at the top of the tank on its side wall, and the container is made of material with high electric resistance, and the output of the acoustic receiver via usilitel is connected to the first input of the counter, the second input is connected to the first output of the timer, and the second output of the timer is connected with the control circuit of the flow regulator, and the output of the meter is attached to the indicator, while for heating the liquid source supply is connected to the ends of the container.

2. The device according to claim 1, characterized in that the inner side of the cover has the shape of a truncated cone, the bottom of which rests on the upper edge of the tank, and the upper base equal to the sensor element acoustic receiver, while the inside of the lid insert is attached in the form of a truncated cone, the bottom of which rests on the upper edge of the vessel and the area of the upper base of the cone insert is greater than or equal to the area of the sensitive element of the acoustic receiver, the height of the conical insert does not exceed half the thickness of the cover and the surface of the conical insert is uniformly perforated.



 

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