CN114252214B - Constant pressure experiment-based pressure balance valve leakage amount detection device and method - Google Patents
Constant pressure experiment-based pressure balance valve leakage amount detection device and method Download PDFInfo
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Abstract
The invention discloses a constant pressure experiment-based device and a constant pressure experiment-based method for detecting leakage of a pressure balance valve, wherein the device comprises a detected valve, a gas storage tank, a mass block working pipeline, a mass block, a stop valve and a gas compressor; the airflow inlet of the tested valve is connected with the gas storage tank through a gas conveying pipeline; the gas compressor is connected with the gas storage tank through a gas conveying pipeline; and the other airflow outlet of the air storage tank is connected with the airflow inlet of the gas conveying pipeline and fixed by a bolt, the airflow outlet of the gas conveying pipeline is connected to the mass block working pipeline, the mass block is in airtight connection with the mass block working pipeline, and the mass block can freely move in the mass block working pipeline according to the pressure of the gas in the mass block working pipeline. The leakage amount of the valve under different standard measuring pressures can be measured, the self weight of the mass block can be further reduced, the detection problem when trace leakage occurs in the valve is solved, the problem that the measurement accuracy of the leakage amount is not high is solved, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a constant pressure experiment-based device and method for detecting leakage of a pressure balance valve.
Background
Various leakages exist in daily life environments and engineering practice, and the influence caused by some leakages is light, such as waste of materials; but some leaks are quite serious, such as the leakage of some flammable and explosive and toxic substances can harm the personal safety. In addition, due to the presence of the leak holes, air, moisture, dust, etc. can easily enter the equipment, contaminate the working medium, affect the quality of the product, and reduce the life of the machine.
Valves are devices used in fluid systems to control fluid direction, pressure, and flow. Its function is to make the medium in the pipe or equipment flow or stop and can control its flow rate. The sealing performance of the valve refers to the capability of each sealing part of the valve for preventing medium leakage, and is one of the most important technical performance indexes of the valve. In recent years, valve leakage accidents frequently occur, which cause great loss, the valve leakage becomes one of the main leakage sources in a fluid system, especially for a gas system, and the leakage grade of the valve leakage is specified for the country of the valve leakage amount, the use specification of the valve leakage amount needs to reach the corresponding standard, if a product with the leakage amount not within the specified standard is used, the performance of the product is affected, and unpredictable results are generated under severe conditions, such as fire, explosion, harmful gas leakage and the like. Therefore, leakage detection is required to determine whether the leakage reaches the standard level used by the state regulation.
The traditional gas leakage quantity measuring method is generally to install a mass flowmeter on the leakage side of a sealing element, such as a thermal mass flowmeter, a Coriolis mass flowmeter and the like to measure the leakage quantity, but the method is only suitable for occasions with large leakage quantity, and when the leakage quantity is small, the method is not suitable any more, and the precision cannot meet the requirement. In addition, a differential pressure measurement method is often used, and the actual leakage amount is obtained by using the pressure difference between a reference object and a measured object, but the device for measuring pressure has a certain measurement error, so that the accuracy is not very high. Another method is to collect the leaked gas through a certain cavity, and then obtain the leakage amount, but the cavity volume is not good to measure. In some measuring methods, a control system and a pressure device are integrated by using the concept of constant pressure, when the pressure in a cavity is reduced, an air supply device inflates air into the cavity through a transmitted pressure signal to enable the pressure to reach the previous pressure, and finally, the leakage rate is obtained after a certain time, but the method has certain limitation. The whole system is huge, the designed parts are more, the accumulated error is larger, and meanwhile, the air inflation process has certain error, so that the air inflation system is not suitable for the occasion of trace leakage.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for detecting the leakage quantity of a pressure balance valve based on a constant pressure experiment aiming at the defects of the prior art.
The technical scheme of the invention is as follows:
a constant pressure experiment-based leakage detection device for a pressure balance valve comprises a tested valve (1), a gas storage tank (2), a mass block working pipeline (9), a mass block (10), a stop valve (15) and a gas compressor (16); the airflow inlet of the tested valve (1) is connected with the air storage tank (2) through a gas conveying pipeline; the gas compressor (16) is connected with the gas storage tank (2) through a gas conveying pipeline; the other airflow outlet of the air storage tank (2) is connected with the airflow inlet of the air conveying pipeline (12) and fixed by bolts, the airflow outlet of the air conveying pipeline (12) is connected to the mass block working pipeline (9), and the massThe mass block (10) is in airtight connection with the mass block working pipeline (9), and the mass block (10) can freely move in the mass block working pipeline (9) according to the pressure of gas in the mass block working pipeline (9); the leakage of the valve to be measured is measured by the displacement of the mass (10) in time t (h ═ h) 1 -h 2 And calculating to obtain the product.
According to the constant pressure experiment-based leakage detection device for the pressure balance valve, a surface groove of a mass block (10) is connected with a mass block working pipeline (9) through a COP (coefficient of performance) sealing ring (10-2); and silicone oil (10-3) is injected into a groove formed between the middle surface of the mass block (10) and the mass block working pipeline (9).
The pressure balance valve leakage detection device based on the constant pressure experiment further comprises a guide post (11), wherein the guide post (11) is connected with the mass block (10) in a combined mode to provide a guiding effect for the movement of the mass block.
According to the pressure balance valve leakage amount detection device based on the constant pressure experiment, a pressure gauge (14) is installed on a gas conveying pipeline (12); a pressure gauge (18) is arranged on the tank body of the air storage tank (2).
The leakage detection device of the pressure balance valve based on the constant pressure experiment is characterized in that a pulley block mechanism is connected to the lower portion of a mass block (10), the pulley block comprises a small mass block (8-6), and the weight of the small mass block (8-6) is amplified through the amplification effect of the pulley block force and then applied to the mass block (10) so as to reduce the weight of the mass block (10).
According to the constant-pressure experiment-based leakage detection device for the pressure balance valve, in the pulley block mechanism, two ends of a first rope are respectively connected with the lower part of the mass block (10), the first rope is folded in half to form two ropes, the two ropes respectively pass around a fixed pulley (8-1) and a fixed pulley (8-2) fixed on the lower part of the mass block (10) to apply downward pressure to the mass block (10), and the two ropes are symmetrical by taking the axis of the mass block (10) as a central axis; the middle parts of the two ropes are wound around the movable pulley (8-3), after the movable pulley (8-3) is fixed with a second rope, the second rope passes through the fixed pulley (8-4) and then is fixedly connected with the lower end of the pulley block (8-5); the upper end of the pulley block (8-5) is connected with the small mass block (8-6) by a rope combination.
Pressure balance valve leakage detection device based on constant voltage experiment, add on gas transmission pipeline (12) pipeline between gas holder (2) and quality piece working line (9) one with gas transmission pipeline (12) parallel pressurization mechanism (5), pressurization mechanism's both ends and original gas transmission pipeline (12) set up side by side promptly, add stop valve (13) on gas transmission pipeline (12) at the both ends of pressurization mechanism (5), increase stop valve (3) and stop valve (7) on the pipeline at the both ends of pressurization mechanism (5) simultaneously, pressurization mechanism (5) can realize the pressure boost function as required and withdraw from the pressure boost function.
According to the constant pressure experiment-based leakage detection device for the pressure balance valve, the pressurization mechanism (5) utilizes two pistons with different sectional areas to achieve different pressures on two sides of the piston, so that the area of the piston close to one side of the mass block (10) is larger than that of the piston close to one side of the air storage tank (2); when the standard pressure of the test is large, the stop valve (13) is closed, the stop valve (3) and the stop valve (7) are opened, the pressurization mechanism (5) starts to work, and the large pressure in the air storage tank on the left side of the piston in the pressurization mechanism (5) is converted into the small pressure on the right side of the piston.
According to the valve leakage measuring method of any device, a gas compressor (16) supplies gas into a gas storage tank (2), the pressure in the gas storage tank (2) is increased to the standard pressure, gas supply is stopped, and the position of a mass block (10) at the moment is recorded by using a measuring ruler and recorded as h 1; when the tested valve (1) has trace leakage, the pressure in the gas storage tank (2) is reduced, the gravity of the mass block (10) is larger than the pressure of gas acting on the surface of the mass block (10), and the mass block (10) descends due to the gravity of the mass block; along with the continuous leakage of the tested valve (1), the pressure in the gas storage tank (2) is continuously reduced, the mass block (10) is continuously reduced, and the whole system continuously reaches new balance; recording the position of the mass block (10) at the moment by using a measuring scale after the measuring time t is passed, and recording the position as h 2; the leakage of the valve to be measured is measured by the displacement of the mass (10) in time t (h ═ h) 1 -h 2 And calculating to obtain the final product.
According to the valve leakage quantity measuring method, when the standard pressure to be tested is large, the pressurization mechanism (5) starts to work, the large pressure in the air storage tank on the left side of the piston in the pressurization mechanism (5) is converted into the small pressure on the right side of the piston, and therefore the leakage quantity of the valve with large testing pressure can be measured without replacing a large mass block (10).
According to the valve leakage quantity measuring method, when the standard pressure of a test is large, the weight of the small mass block (8-6) is amplified through the amplification effect of the pulley block force and then applied to the mass block (10), so that the weight of the mass block (10) is reduced.
The invention provides a constant pressure experiment-based device and a constant pressure experiment-based method for detecting the internal leakage of a pressure balance valve. In the process of valve leakage detection, different mass ratios are changed by combining different pulleys in the pulley block mechanism, and the pressurizing mechanism is added simultaneously, so that the leakage of the valve under different standard measurement pressures can be measured, the self weight of the mass block can be further reduced, the detection problem during trace leakage in the valve is solved, the problem of low measurement precision of the leakage is solved, and the application range is wide.
Drawings
Fig. 1 is a schematic diagram of a pressure balance valve leakage detection device based on a constant pressure experiment:
FIG. 2 is a schematic diagram of the position of a pulley block in the device for detecting the leakage of a pressure balanced valve
FIG. 3 is a schematic diagram of the moving seal of the mass in the pipe:
1-tested valve, 2-gas storage tank, 3-stop valve, 4-gas conveying pipeline, 5-supercharging mechanism, 6-gas conveying pipeline, 7-stop valve, 8-pulley block, 8-1-fixed pulley, 8-2-fixed pulley, 8-3-fixed pulley, 8-4-fixed pulley, 8-5-pulley block, 8-6-small mass block, 9-mass block working pipeline, 10-mass block, 10-2-silicon oil, 10-3-COP sealing ring, 11-guide column, 12-gas conveying pipeline, 13-stop valve, 14-pressure gauge, 15-stop valve, 16-gas compressor, 17-gas conveying pipeline, 18-pressure gauge, 19-gas conveying pipeline;
Detailed Description
The present invention will be described in detail with reference to specific examples.
A pressure balance valve leakage detection device based on a constant pressure experiment comprises a detected valve 1, a gas storage tank 2, a mass block working pipeline 9, a mass block 10, a stop valve 15 and a gas compressor 16. The gas flow inlet of the tested valve 1 is connected with the gas flow outlet of the gas conveying pipeline 19 by using a flange and is fixed by bolts. The gas outlet of the gas storage tank 2 is connected with the gas inlet of the gas conveying pipeline 19 by using a flange and is fixed by using bolts. The stop valve 15 is flange-mounted between the gas compressor 16 and the gas delivery pipe 17 and fixed by bolts. Meanwhile, the other gas outlet of the gas storage tank 2 is connected with the gas inlet of the gas conveying pipeline 12 by using a flange and is fixed by using a bolt, and the gas outlet of the gas conveying pipeline 12 is connected to the mass block working pipeline 9. The pressure gauge 14 is mounted on the gas delivery pipe 12 by a screw connection. The gas flow outlet of the gas compressor 16 is connected to the gas flow inlet of a gas delivery duct 17. The gas delivery pipe 17 has a gas flow outlet connected to the gas flow inlet of the gas storage tank 2 by a flange and is fixed by bolts. The pressure gauge 18 is arranged on the tank body of the air storage tank 2 and is connected with the tank body through screw threads. The surface groove of the mass 10 is connected with the mass working pipe 9 by using a COP seal ring 10-2. Silicon oil 10-3 is injected into a groove formed between the middle surface of the mass 10 and the mass working pipe 9. The device also comprises a guide post 11, and the guide post 11 is connected with the mass block 10 in a combined manner to provide a guide function for the movement of the mass block.
The measuring method of the pressure balance valve leakage detection device is characterized in that a gas compressor 16 provides gas into a gas storage tank 2, and for a certain test valve, the gas pressure needs to reach standard test pressure when the leakage is measured, so that when the gas in the gas storage tank 2 is more and more, the pressure in the gas storage tank 2 is also more and more, and until the readings on a pressure gauge 14 and a pressure gauge 18 are just the standard pressure required by the test, the gas supply is stopped, and the position of a mass block 10 at the moment is recorded by using a measuring scale and is recorded as h 1. When the valve 1 to be tested has a trace amount of leakage, the pressure in the gas storage tank 2 is reduced, at the moment, the gravity of the mass block 10 is larger than the pressure of the gas acting on the surface of the mass block 10, the mass block 10 descends due to the gravity of the mass block, so that the volume of the whole cavity is reduced, and the pressure of the gas storage tank 2 is slowly increased until reaching a balance position again. Along with the continuous leakage of the tested valve 1, the pressure in the air storage tank 2 is continuously reduced, the mass block 10 is continuously lowered, and the whole system continuously reaches new balance. Until after a measurement time t, the position of the mass 10 at this time is recorded by means of a measuring ruler, denoted h 2. In the system, because the mass of the mass 10 is unchanged, and the leakage process of the valve 1 to be tested can be regarded as a slow process, the surface friction force of the mass 10 can be regarded as a constant value, and the friction force can be ignored compared with the gravity of the mass 10. Therefore, the pressure in the whole cavity is also kept unchanged, namely constant pressure, the valve 1 to be measured can be always under the standard pressure, and the measurement precision is improved. Meanwhile, a COP sealing ring 10-2 is used for sealing between the mass block 10 and the mass block working pipeline 9, the COP sealing ring has the characteristics of small starting resistance, small friction force, strong sealing capability and the like, and meanwhile, silicon oil 10-3 is added between the mass blocks 10, so that the liquid has strong gas tightness, the gas tightness of the whole sealing device is improved, and the measurement precision of the whole device is improved. Meanwhile, in order to improve the guiding precision of the mass 10, the guiding columns 11 are installed.
According to the scheme, under the condition that the measured standard pressure is too large, the mass block 10 with larger weight is needed to balance the standard pressure, and the system is greatly burdened, so that the pulley block mechanism is further added at the upper end of the mass block 10. Can change rope strand number and then change the pressure at both ends about through the laborsaving nature of assembly pulley 8 self, through suitable rope strand number, can make quality piece self weight be unlikely to too big, the detection of being convenient for. As shown in fig. 1 and 2, two ends of a first rope are respectively connected with the lower part of the mass block 10, the first rope is folded in half to form two ropes, the two ropes respectively pass around a fixed pulley 8-1 and a fixed pulley 8-2 fixed on the lower part of the mass block 10 to apply downward pressure to the mass block 10, and the two ropes are symmetrical by taking the axis of the mass block 10 as a central axis. The middle parts of the two ropes pass around the movable pulley 8-3, after the movable pulley 8-3 is fixed with a second rope, the second rope passes through the fixed pulley 8-4 and then is fixedly connected with the lower end of the pulley block 8-5. The upper end of the pulley block 8-5 is connected with the small mass block 8-6 by a rope in a combined way.
When the fixed pulley and the movable pulley are assembled into the pulley block, the number of rope strands passing around the movable pulley can be increased, so that the stress is shared by more rope strands, and the purpose that the larger standard pressure can be balanced by adopting a smaller small mass block 8-6 is achieved, as shown in figure 2, wherein the rope strands of the pulley block 8-5 are 3 strands, and 3 times of the self weight of the small mass block 8-6 can act on the mass block 10, so that the self weight of the mass block 10 is not very large. When changing the number of the rope strands, the weight of the mass block with different proportions can be obtained, and when the test pressure is increased, the number of the rope strands can be increased so as to achieve the purpose of reducing the weight of the mass block.
Furthermore, the invention adds a supercharging mechanism 5 parallel to the gas transmission pipeline 12 on the gas transmission pipeline 12 between the gas storage tank 2 and the mass block working pipeline 9, namely, two ends of the supercharging mechanism are parallel to the original gas transmission pipeline 12, a stop valve 13 is additionally arranged on the gas transmission pipeline 12 at two ends of the supercharging mechanism 5, meanwhile, stop valves 3 and 7 are additionally arranged on the pipelines at two ends of the supercharging mechanism 5, so that the supercharging mechanism 5 can conveniently realize the supercharging function and the pressure quitting supercharging function according to the requirement, the supercharging mechanism 5 utilizes two pistons with different cross sections to achieve the pressure difference at two sides of the piston, the piston area A2 close to one side of the mass block 10 is larger, the piston area A1 close to one side of the gas storage tank 2 is smaller, when the pressure in the whole cavity reaches a constant pressure, the pressure on the side with the larger area is smaller according to A1P 1-A2-P2, i.e. the pressure on the side close to the mass is small, P2< P1, and P2 × a2 needs to be balanced with the weight of the mass itself. When the standard pressure of test is great, close stop valve 13, open stop valve 3 and stop valve 7, make booster mechanism 5 begin to work, with the great pressure conversion of booster mechanism 5 middle piston left side gas holder the inside less pressure in piston right, need not change the leakage quantity of great test pressure's valve like this just can be measured to big quality piece 10, also can reduce pressure and then can reduce the weight of quality piece 10 self, and then satisfy this test pressure's requirement.
The leakage of the valve is determined by the displacement Δ h ═ h of the mass 10 over the time t 1 -h 2 And calculating to obtain the result. The specific calculation is as follows:
according to the ideal gas state equation,
PV＝nRT
after the leakage time t, the leaked gas is,
converted to give a leakage of
Wherein R and T 0 273K is a constant, and only Δ h is a measured value, so that the leakage rate can be obtained;
according to the specific form and the working principle that the pressure balance valve leakage detection device comprises a mechanical structure part, a mass block sealing part and a decompression mechanism part, the implementation key points of the assembly method are as follows:
the gas flow inlet of the tested valve 1 is connected with the gas flow outlet of the gas conveying pipeline 19 by using a flange and is fixed by bolts. The stop valve 3 is mounted between the gas transmission pipeline 12 and the gas transmission pipeline 4 by flanges and fixed by bolts. A pressurizing mechanism 5 is arranged between the gas conveying pipeline 4 and the gas conveying pipeline 6 through flanges and is fixed through bolts. The gas outlet of the gas storage tank 2 is connected with the gas inlet of the gas conveying pipeline 19 by using a flange and is fixed by using bolts.
The stop valve 7 is mounted between the gas transmission pipeline 12 and the gas transmission pipeline 6 by flanges and fixed by bolts. The shut-off valve 13 is flange-mounted between the gas delivery pipes 12 and is fixed by bolts. The stop valve 15 is flange-mounted between the gas compressor 16 and the gas delivery pipe 17 and fixed by bolts. Meanwhile, the other gas outlet of the gas storage tank 2 is connected with the gas inlet of the gas conveying pipeline 12 by using a flange and is fixed by using bolts.
The pressure gauge 14 is mounted on the gas delivery pipe 12 by a screw connection.
The gas flow outlet of the gas compressor 16 is connected to the gas flow inlet of the gas delivery duct 16. The gas outlet of the gas delivery pipe 17 is connected to the gas inlet of the gas storage tank 2 by a flange and fixed by bolts 4.
The pressure gauge 18 is arranged on the tank body of the air storage tank 2 and is connected by screw threads.
The surface groove of the mass 10 is connected with the mass working pipe 9 by using a COP seal ring 10-2. Silicon oil 10-3 is injected into a groove formed between the middle surface of the mass 10 and the mass working pipe 9. The guide column 11 is connected with the mass block 10 in combination.
The pressure balance valve leakage detection and measurement device realized by the assembly method comprises the following test methods:
the gas compressor 16 supplies gas to the gas storage tank 2, and for a certain test valve, the gas pressure needs to reach the standard test pressure when the leakage amount is measured, so when the gas in the gas storage tank 2 is more and more, the pressure in the gas storage tank 2 is also more and more, and until the readings on the pressure gauge 14 and the pressure gauge 18 are just the standard pressure required by the test, the gas supply is stopped.
The position of the mass 10 at this time is recorded by means of a measuring ruler, denoted h 1.
When the tested valve 1 leaks slightly, the pressure in the gas storage tank 2 is reduced, the gravity of the mass block 10 is larger than the pressure of gas acting on the surface of the mass block 10, the mass block 10 descends due to the gravity of the mass block, the volume of the whole cavity is reduced, and the pressure of the gas storage tank 2 is slowly increased until reaching a balance position. Along with the continuous leakage of the tested valve 1, the pressure in the air storage tank 2 is continuously reduced, the mass block 10 is continuously lowered, and the whole system continuously reaches new balance.
Until a measuring time t has elapsed, the position of the mass 10 at this time is recorded by means of a measuring scale, denoted h 2.
In the system, because the mass of the mass block 10 is unchanged, and the leakage process of the valve 1 to be tested can be regarded as a slow process, the surface friction force of the mass block 10 can be regarded as a constant value, and the friction force can be ignored compared with the gravity of the mass block 10. Therefore, the pressure in the whole cavity is also kept constant, namely constant pressure, the valve 1 to be measured can be always under the standard pressure, and the measurement precision is improved.
Meanwhile, a COP sealing ring 10-2 is used for sealing between the mass block 10 and the mass block working pipeline 9, the COP sealing ring has the characteristics of small starting resistance, small friction force, strong sealing capability and the like, and meanwhile, silicon oil 10-3 is added between the mass blocks 10, so that the liquid has strong gas tightness, the gas tightness of the whole sealing device is improved, and the measurement precision of the whole device is improved. Meanwhile, in order to improve the guiding accuracy of the mass block 10, the guide posts 11 are installed.
In order to prevent the weight of the mass 10 from being too large due to the measured standard pressure, a pulley block mechanism is added at the upper end of the mass 10, and a booster mechanism 5 is added in front of the pipeline. Its concrete principle is that can change rope strand number and then change the pressure at both ends about through the laborsaving nature of assembly pulley 8 self, through suitable rope strand number, can make quality piece self weight be unlikely to too big, the detection of being convenient for. Meanwhile, when the test pressure of the tested valve is changed, the pressure increasing mechanism 5 can also reduce the pressure so as to reduce the weight of the mass block 10, and further meet the requirement of the test pressure. Meanwhile, the pulley block 8 can be used for manufacturing different rope strands according to different standard measuring pressures of the tested valve 1, and the device is suitable for occasions of testing the standard pressures by different leakage amounts.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. A constant pressure experiment-based leakage detection device for a pressure balance valve is characterized by comprising a tested valve (1), a gas storage tank (2), a mass block working pipeline (9), a mass block (10), a first stop valve (15) and a gas compressor (16); the airflow inlet of the tested valve (1) is connected with the air storage tank (2) through a gas conveying pipeline; gas pressureThe compressor (16) is connected with the gas storage tank (2) through a gas conveying pipeline; the other airflow outlet of the air storage tank (2) is connected with the airflow inlet of the air conveying pipeline (12) and is fixed by bolts, the airflow outlet of the air conveying pipeline (12) is connected to the mass block working pipeline (9), the mass block (10) is in airtight connection with the mass block working pipeline (9), and the mass block (10) can freely move in the mass block working pipeline (9) according to the pressure of the air in the mass block working pipeline (9); the leakage of the valve to be tested is measured by the displacement of the mass (10) in time t
Calculating to obtain; the lower part of the mass block (10) is connected with a pulley block mechanism, the pulley block comprises a small mass block (8-6), and the weight of the small mass block (8-6) is amplified through the amplification effect of the pulley block force and then applied to the mass block (10) so as to reduce the weight of the mass block (10).
2. The leakage amount detecting device of the pressure balanced valve based on the constant pressure experiment as claimed in claim 1, wherein the surface groove of the mass (10) is connected with the mass working pipe (9) using COP packing (10-2); and silicone oil (10-3) is injected into a groove formed between the middle surface of the mass block (10) and the mass block working pipeline (9).
3. The leakage detection device of the pressure balance valve based on the constant pressure experiment is characterized in that the device further comprises a guide post (11), and the guide post (11) is connected with the mass block (10) in a combined manner to provide a guide function for the movement of the mass block.
4. The leakage detection device of the pressure balance valve based on the constant pressure experiment as claimed in claim 1, wherein a first pressure gauge (14) is installed on the gas delivery pipe (12); a second pressure gauge (18) is arranged on the tank body of the air storage tank (2).
5. The valve leakage detecting device for the pressure balanced valve based on the constant pressure experiment as claimed in claim 1, wherein in the pulley block mechanism, both ends of a first rope are respectively connected with the lower portion of the mass block (10), the first rope is folded in half to form two ropes, the two ropes respectively go around a fixed pulley (8-1) and a fixed pulley (8-2) fixed on the lower portion of the mass block (10) to apply downward pressure to the mass block (10), and the two ropes are symmetrical with respect to the axis of the mass block (10); the middle parts of the two ropes are wound around the movable pulley (8-3), after the movable pulley (8-3) is fixed with a second rope, the second rope passes through the fixed pulley (8-4) and then is fixedly connected with the lower end of the pulley block (8-5); the upper end of the pulley block (8-5) is connected with the small mass block (8-6) by a rope combination.
6. The constant pressure experiment-based pressure balance valve leakage detection device according to claim 1, wherein a pressurization mechanism (5) parallel to the gas delivery pipe (12) is added to the gas delivery pipe (12) between the gas tank (2) and the mass working pipe (9), that is, the two ends of the pressurization mechanism are parallel to the original gas delivery pipe (12), a second stop valve (13) is added to the gas delivery pipe (12) at the two ends of the pressurization mechanism (5), and a third stop valve (3) and a fourth stop valve (7) are added to the pipes at the two ends of the pressurization mechanism (5), and the pressurization mechanism (5) can realize a pressurization function and a pressure withdrawal function as required.
7. The constant pressure experiment-based leakage detection device for the pressure balanced valve according to claim 6, wherein the pressurization mechanism (5) uses two pistons with different cross-sectional areas to achieve different pressures on both sides of the piston, so that the area of the piston on the side close to the mass block (10) is larger than the area of the piston on the side close to the air storage tank (2); when the standard pressure of the test is large, the second stop valve (13) is closed, the third stop valve (3) and the fourth stop valve (7) are opened, the pressurization mechanism (5) starts to work, and the large pressure in the air storage tank on the left side of the piston in the pressurization mechanism (5) is converted into the small pressure on the right side of the piston.
8. A method of measuring valve leakage according to any of claims 1 to 7, characterised in that the gas compressor (16) supplies gas to the gas reservoir (2), the pressure in the gas reservoir (2) is raised to a standard pressure, the gas supply is stopped, the position of the mass (10) at that time is recorded by means of a measuring scale and recorded ash 1 (ii) a When the tested valve (1) has trace leakage, the pressure in the gas storage tank (2) is reduced, the gravity of the mass block (10) is larger than the pressure of gas acting on the surface of the mass block (10), and the mass block (10) descends due to the gravity of the mass block; along with the continuous leakage of the tested valve (1), the pressure in the air storage tank (2) is continuously reduced, the mass block (10) is continuously lowered, and the whole system continuously reaches new balance; until the measuring time t elapses, the position of the mass (10) is recorded by means of the measuring scale and is recorded ash 2 (ii) a The leakage of the valve to be tested is measured by the displacement of the mass (10) in time t
And calculating to obtain the product.
9. A method according to claim 8, characterized in that when the standard pressure is higher, the booster mechanism (5) is activated to convert the higher pressure in the left reservoir of the piston in the booster mechanism (5) to a lower pressure in the right side of the piston, so that the leakage of the valve with the higher test pressure can be measured without replacing the large mass (10).
10. The valve leakage measuring method according to claim 8, wherein when the standard pressure of the test is large, the weight of the small mass (8-6) is applied to the mass (10) after being amplified by the amplification effect of the pulley block force, so as to reduce the weight of the mass (10).
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| CN202111590133.5A CN114252214B (en) | 2021-12-23 | 2021-12-23 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
| PCT/CN2022/098350 WO2023115841A1 (en) | 2021-12-23 | 2022-06-13 | Constant-pressure experiment based device and method for measuring valve leakage of pressure balance valve |
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| CN202111590133.5A CN114252214B (en) | 2021-12-23 | 2021-12-23 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
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| CN114252214B (en) * | 2021-12-23 | 2022-08-30 | 中国矿业大学 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
| CN115326314B (en) * | 2022-10-10 | 2023-01-13 | 西南医科大学附属医院 | Machine control leakage test control system of anesthesia machine |
| CN117472107B (en) * | 2023-12-26 | 2024-04-16 | 湖南省计量检测研究院 | Control method for balance working position of piston type pressure gauge |
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| US5189904A (en) * | 1990-08-30 | 1993-03-02 | Vista Research, Inc. | Temperature compensated methods for detection of leaks in pressurized pipeline systems using piston displacement apparatus |
| CN1880936A (en) * | 2005-06-17 | 2006-12-20 | 浙江工业大学 | High precision micro-gas leakage detector |
| CN202403904U (en) * | 2011-12-26 | 2012-08-29 | 西安庆安电气控制有限责任公司 | Device for testing sealing joint |
| KR101224192B1 (en) * | 2012-04-06 | 2013-01-21 | 유종훈 | High temperature high pressure valve test device |
| CN102865271A (en) * | 2012-09-28 | 2013-01-09 | 天津鼎成高新技术产业有限公司 | Detection method and device of internal leakage of hydraulic valve |
| JP3182398U (en) * | 2013-01-10 | 2013-03-21 | 関電プラント株式会社 | Leak detector |
| CN103791238A (en) * | 2014-02-18 | 2014-05-14 | 北京工业大学 | Experimental apparatus for measuring medium leakage characteristic of fuel gas pipeline |
| CN205655969U (en) * | 2016-03-23 | 2016-10-19 | 中国石油化工股份有限公司 | Device that leaks in simulation gas valve |
| CN105928774B (en) * | 2016-07-07 | 2019-08-23 | 广州国光仪器有限公司 | Soil sample resonance column device |
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| CN106918427B (en) * | 2017-04-28 | 2023-06-13 | 嘉兴南湖学院 | Experimental device for real-time measurement oil blanket leakage rate |
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| CN108843654A (en) * | 2018-07-04 | 2018-11-20 | 上海交通大学 | A kind of valve control cylinder mode leakage judgment means and method based on Subspace Identification |
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| CN209727383U (en) * | 2019-05-16 | 2019-12-03 | 李康英 | A kind of air-conditioning compressor cylinder device for detecting sealability |
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| CN114252214B (en) * | 2021-12-23 | 2022-08-30 | 中国矿业大学 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
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