Rapid online detection device and method for breather valve

Abstract

The invention discloses a quick online detection device and method for a breather valve, and relates to the technical field of breather valves. The quick online detection device for the breather valve comprises a sealing part, a surge tank, an air source, a plurality of stop valves, a plurality of regulating valves, a plurality of pressure gauges, a plurality of flowmeters and a controller, wherein the controller is respectively connected with the pressure gauges and the flowmeters. The sealing part is connected with the surge tank through a first adjusting pipeline section and a second adjusting pipeline section, and the surge tank is connected with the gas source. And a differential pressure gauge is arranged on a pipeline between the sealing part and the first adjusting pipeline section and is connected with the controller. According to the reverse principle of work of the breather valve, the leakage amount of the breather valve does not need to be specifically measured, whether the breather valve can meet the use requirement or not is rapidly judged only through reading changes of the pressure meter and the flow meter, the detection efficiency can be improved, the safety risk can be reduced, and meanwhile the problems that operation is tedious and time-consuming due to disassembly of the breather valve are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of breathing valves, and in particular to a rapid online detection device and method for breathing valves. Background Art

[0002] The breathing valve is a low-pressure protection device used in the petroleum, chemical, natural gas and other industries. It is a safety facility used on the top of the atmospheric pressure storage tank to keep the pressure in the atmospheric pressure storage tank always in a normal state, to reduce the evaporation loss of volatile liquids in the atmospheric pressure storage tank, and to protect the tank body from overpressure or vacuum damage. With the formulation of several relevant standards for the detection of breathing valves, it is required to conduct regular inspections on the breathing valves of storage tanks.

[0003] At present, when performing positive and negative pressure tests on tank breathing valves, it is generally necessary to disassemble the breathing valve as a whole, which is a cumbersome and time-consuming operation. The disassembly process not only increases labor costs, but also may cause damage to the breathing valve or poor sealing after installation due to improper operation, thus causing safety hazards.

[0004] In addition, the disassembly detection method cannot reflect the performance status of the breathing valve in the actual working environment in real time and accurately, especially under complex working conditions where positive and negative pressures alternate, key indicators such as sealing, flexibility and response speed are difficult to be fully evaluated. Summary of the invention

[0005] In view of the above-mentioned problem that when testing the positive and negative opening pressures of the breathing valve, the breathing valve needs to be disassembled and assembled, which is complicated and time-consuming to operate, the present invention provides a rapid online detection device and method for the breathing valve.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A rapid online detection device for a breathing valve includes a sealing part, a pressure-stabilizing tank, an air source, a plurality of stop valves, a plurality of regulating valves, a plurality of pressure gauges, a plurality of flow meters and a controller, and the controller is respectively connected to each of the pressure gauges and flow meters. The sealing part is connected to the pressure-stabilizing tank through a first adjustment pipeline section and a second adjustment pipeline section. The first adjustment pipeline section includes a first three-way stop valve, a second three-way stop valve and a third three-way stop valve, and each component is connected by a pipeline; the second adjustment pipeline section includes a fourth three-way stop valve, a fifth three-way stop valve and a first ball valve, and each component is connected by a pipeline. The air source includes a first air source and a second air source, and the pressure-stabilizing tank is respectively connected to the first air source and the second air source. A differential pressure gauge is arranged on the pipeline between the sealing part and the first adjustment pipeline section, and the differential pressure gauge is connected to the controller.

[0007] Further, the first port of the first three-way stop valve is connected to the sealing portion, the second port is connected to the second port of the third three-way stop valve, and the third port is connected to the second port of the second three-way stop valve; the first port of the second three-way stop valve is connected to the first port of the third three-way stop valve, and the third port is connected between the second port of the first three-way stop valve and the second port of the third three-way stop valve; the third port of the third three-way stop valve is connected between the third port of the first three-way stop valve and the second port of the second three-way stop valve. A flow meter is provided on the pipeline between the first port of the second three-way stop valve and the first port of the third three-way stop valve, and the flow meter is connected to the controller.

[0008] Further, the second port of the third three-way stop valve is connected to the first port of the fourth three-way stop valve and one end of the first ball valve respectively; the second port of the fourth three-way stop valve is connected to the third port of the fifth three-way stop valve, and the third port is connected to the second port of the fifth three-way stop valve; the first port of the fifth three-way stop valve is connected to the first port of the pressure-sustaining tank; the other end of the first ball valve is connected to the first port of the pressure-sustaining tank. A first metering valve or a back pressure valve is provided on the pipeline between the second port of the fourth three-way stop valve and the third port of the fifth three-way stop valve. A second metering valve or a pressure reducing valve is provided on the pipeline between the third port of the fourth three-way stop valve and the second port of the fifth three-way stop valve.

[0009] Furthermore, the pressure stabilizing tank is connected to the first gas source through a first gas path, and is connected to the second gas source through a second gas path, and a plurality of thermometers and a plurality of pressure gauges are provided on the pressure stabilizing tank.

[0010] Further, the first gas source uses nitrogen, the first gas circuit includes a first branch, a second branch and a sixth three-way stop valve, the first gas source is connected to one end of the first gas circuit and the second gas circuit respectively through the sixth three-way stop valve, the other end of the first gas circuit is connected to the second port of the pressure-sustaining tank, and the other end of the second gas circuit is connected to the third port of the pressure-sustaining tank. The second gas circuit includes a second ball valve, a seventh three-way stop valve, an eighth three-way stop valve and a second activated carbon tank, the second gas source is composed of a plurality of parallel diaphragm pumps, the fourth port of the pressure-sustaining tank is connected to the second port of the seventh three-way stop valve through the second ball valve, the first port of the seventh three-way stop valve is connected to the first port of the eighth three-way stop valve through the second gas source, the second port of the eighth three-way stop valve is connected to the second activated carbon tank, and the third port is connected between the second ball valve and the seventh three-way stop valve; the third port of the seventh three-way stop valve is connected to the pipeline between the eighth three-way stop valve and the second activated carbon tank.

[0011] Further, the first port of the sixth three-way stop valve is connected to the first gas source, the second port is connected to the first branch, and the third port is connected to the second branch. The first branch is provided with a pneumatic valve and a first manual valve, the second branch is provided with a venturi tube, a first activated carbon canister and a second manual valve, the inlet end of the venturi tube is connected to the third port of the sixth three-way stop valve, the contraction end is connected to the second manual valve, and the outlet end is connected to the first activated carbon canister through a muffler.

[0012] A method for rapid online detection of a breathing valve is applied to a device for rapid online detection of a breathing valve as described above, and is used to measure the positive pressure opening pressure, positive pressure leakage, negative pressure opening pressure and negative pressure leakage of the breathing valve. A compensation algorithm is provided in the controller for compensating for the positive pressure opening pressure and the negative pressure opening pressure. It is characterized in that it specifically includes the following sub-methods: a method for measuring the positive pressure opening pressure, after the sealing part is connected to the positive pressure outlet of the breathing valve, and then connected to the sealing part and the storage tank respectively through a differential pressure transmitter, and each of the stop valves and regulating valves is switched. The first gas source or the second gas source generates positive pressure. When the first gas source generates positive pressure, the first manual valve is closed and the valve is opened. Open the second manual valve, the nitrogen passes through the sixth three-way stop valve, and intersects with the gas from the pressure-regulating tank in the venturi tube, and then enters the first activated carbon tank through the muffler, and observe and record the changes in the indications of the pressure gauge and flow meter; when the second gas source generates positive pressure, the gas from the pressure-regulating tank passes through the second ball valve, the seventh three-way stop valve, the second gas source and the eighth three-way stop valve, and enters the second activated carbon tank, and observe and record the changes in the indications of the pressure gauge and flow meter; the first gas source or the second gas source stores energy for the pressure-regulating tank, and then the first ball valve is opened, so that the gas from the storage tank passes through the breathing valve, the first three-way stop valve and the first ball valve in sequence and enters the pressure-regulating tank.

[0013] The positive pressure leakage measurement method is to release the pressure after the positive pressure opening pressure measurement method is completed. The controller obtains the positive pressure opening pressure obtained by the positive pressure opening pressure measurement method and forms a pressure for measuring the leakage. Then, the stop valve and the regulating valve are switched so that the gas passes through the breathing valve, the first three-way stop valve, the third three-way stop valve, the second three-way stop valve, the fourth three-way stop valve and the fifth three-way stop valve in the storage tank and enters the pressure stabilizing tank in sequence. The stop valve and the regulating valve are continuously adjusted and the readings on the differential pressure gauge and the pressure gauge are observed until the readings stabilize.

[0014] The negative pressure opening pressure measurement method is as follows: after the sealing part is connected to the negative pressure outlet of the breathing valve, the sealing part and the storage tank are respectively connected through the differential pressure transmitter, and the stop valve and the regulating valve are switched, and the first gas source or the second gas source generates negative pressure; when the first gas source generates negative pressure, the first manual valve is opened and the second manual valve is closed, and the nitrogen enters the pressure-stabilizing tank through the sixth three-way stop valve, the pneumatic valve and the first manual valve, and the changes in the indications of the pressure gauge and the flow meter are observed and recorded; when the second gas source generates negative pressure, the gas from the outside enters the pressure-stabilizing tank through the second activated carbon tank, the seventh three-way stop valve, the second gas source, the eighth three-way stop valve and the second ball valve; the first gas source or the second gas source stores energy for the pressure-stabilizing tank, and then the first ball valve is opened, so that the gas in the pressure-stabilizing tank passes through the first ball valve and the first three-way stop valve into the breathing valve, and the changes in the indications of the pressure gauge and the flow meter are observed and recorded.

[0015] The negative pressure leakage measurement method is to release the pressure after the negative pressure opening pressure measurement method is completed. The controller obtains the negative pressure opening pressure obtained by the negative pressure opening pressure measurement method and forms the pressure of the negative pressure leakage. Then, the stop valve and the regulating valve are switched so that the gas in the pressure regulating tank passes through the fifth three-way stop valve, the fourth three-way stop valve, the third three-way stop valve, the second three-way stop valve and the first three-way stop valve to enter the breathing valve. The stop valve and the regulating valve are continuously adjusted and the indications on the differential pressure gauge and the pressure gauge are observed until the indications are stable.

[0016] The method for judging whether the breathing valve is qualified is that the staff pre-sets the set flow of the controller according to the diameter of the breathing valve, and reads the reading of the differential pressure gauge after correction and compensation after stabilization. If the reading after correction and compensation is ≥ 75% of the positive or negative pressure opening pressure, it means that the breathing valve is qualified; if the reading after correction and compensation is < 75% of the positive or negative pressure opening pressure, it means that the breathing valve is unqualified.

[0017] Furthermore, before performing the positive or negative pressure opening pressure measurement method, it is necessary to adjust each of the stop valves and regulating valves so that the first gas source or the second gas source is evacuated to 0.3 times the opening pressure of the breathing valve, and observe the changes in the flow meter reading. If the flow meter reading becomes 0 within 5 minutes, it indicates that the sealing part is tightly connected to the air outlet of the breathing valve.

[0018] Furthermore, the controller is connected to a display screen, and the display screen is used to display the changes in the indications of the pressure gauge and flow meter. There are two ways to obtain the positive pressure opening pressure or the negative pressure opening pressure: the first is to gradually increase the opening of the regulating valve, and observe the pressure curve and the flow curve shown on the display screen until the flow curve increases and the pressure curve is horizontal when the opening of the regulating valve is increased. The pressure at this time is the opening pressure of the breathing valve; the second is to quickly increase the opening of the regulating valve, and the pressure curve when the pressure curve tends to be horizontal after an inflection point appears is the opening pressure of the breathing valve.

[0019] Furthermore, a method for obtaining leakage volume, wherein the pressure for measuring leakage volume is 0.75 times the opening pressure of positive pressure or negative pressure, and the first metering valve or the second metering valve is continuously adjusted to adjust the differential pressure transmitter to the pressure for measuring leakage volume. When the indication of the pressure gauge is stable, the data displayed by the flow meter is the positive pressure or negative pressure leakage volume.

[0020] The beneficial effects of the present invention are as follows: the present invention utilizes the reverse pressure difference method of the working of the breathing valve, and adopts the first gas source or the second gas source to draw a vacuum externally when measuring the positive pressure opening pressure and positive pressure leakage of the breathing valve, and adopts the first gas source or the second gas source to inflate externally when measuring the negative pressure opening pressure and negative pressure leakage of the breathing valve. There is no need to specifically measure the leakage of the breathing valve, and only the changes of the pressure gauge and the flow meter can be used to quickly judge whether the breathing valve can meet the use requirements. This can improve the detection efficiency and reduce safety risks while solving the problems of cumbersome, time-consuming and costly operation of disassembling the breathing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic diagram of the structural principle of an embodiment of the present invention.

[0022] Figure 2 Shown is the operating structure diagram for measuring the positive pressure opening pressure.

[0023] Figure 3 The diagram shows the operating structure for measuring positive pressure leakage.

[0024] Figure 4 The diagram shows the operating structure for measuring the negative pressure opening pressure.

[0025] Figure 5 The diagram shows the operating structure for measuring negative pressure leakage.

[0026] Explanation of the reference numerals in the accompanying drawings: 1. Sealing part; 2. Differential pressure gauge; 3. First three-way stop valve; 4. Second three-way stop valve; 5. Third three-way stop valve; 6. Fourth three-way stop valve; 7. Fifth three-way stop valve; 8. Sixth three-way stop valve; 9. Seventh three-way stop valve; 10. Eighth three-way stop valve; 11. Flow meter; 12. First metering valve; 13. Second metering valve; 14. First ball valve; 15. Second ball valve; 16. Pressure regulating tank; 17. Pressure gauge; 18. First manual valve; 19. Second manual valve; 20. Pneumatic valve; 21. Venturi tube; 22. Muffler; 23. Diaphragm pump. DETAILED DESCRIPTION

[0027] The present invention discloses a rapid online detection device and method for a breathing valve, which is used to measure the positive pressure opening pressure, positive pressure leakage, negative pressure opening pressure and negative pressure leakage of the breathing valve. An embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, a rapid online detection device for a breathing valve includes a sealing part 1, a pressure-stabilizing tank 16, a first air source, a second air source, a plurality of stop valves, a plurality of regulating valves, a plurality of presses, a plurality of flow meters 11 and a controller, and the controller is connected to each press and flow meter 11 respectively. The sealing part 1 adopts a hard blind plate or a soft material, such as a rubber capsule or other soft material, which is used to block the positive pressure outlet or the negative pressure outlet of the breathing valve to form a closed cavity. The central part of the sealing part 1 is connected to the pressure-stabilizing tank 16 through a pipeline through the first adjustment pipeline section and the second adjustment pipeline section at one time, and the various components are connected by pipelines. The pressure-stabilizing tank 16 is connected to the first air source through the first air path, and is connected to the second air source through the second air path. The pressure-stabilizing tank 16 has four ports and is provided with a plurality of thermometers and a plurality of pressure gauges 17.

[0029] The first adjustment pipeline section includes a first three-way stop valve 3, a second three-way stop valve 4 and a third three-way stop valve 5. The components are connected by pipelines. The first port of the first three-way stop valve 3 is connected to the sealing part 1, the second port is connected to the second port of the third three-way stop valve 5, and the third port is connected to the second port of the second three-way stop valve 4. The first port of the second three-way stop valve 4 is connected to the first port of the third three-way stop valve 5, and the third port is connected between the second port of the first three-way stop valve 3 and the second port of the third three-way stop valve 5. The third port of the third three-way stop valve 5 is connected between the third port of the first three-way stop valve 3 and the second port of the second three-way stop valve 4. A flow meter 11 is provided on the pipeline between the first port of the second three-way stop valve 4 and the first port of the third three-way stop valve 5, and the flow meter 11 is connected to the controller. A first metering valve 12 or a back pressure valve is provided on the pipeline between the second port of the fourth three-way stop valve 6 and the third port of the fifth three-way stop valve 7. A second metering valve 13 or a pressure reducing valve is provided on the pipeline between the third port of the fourth three-way stop valve 6 and the second port of the fifth three-way stop valve 7 .

[0030] The second adjustment pipeline section includes a fourth three-way stop valve 6, a fifth three-way stop valve 7 and a first ball valve 14, and the components are connected by pipelines. The second port of the third three-way stop valve 5 is connected to the first port of the fourth three-way stop valve 6 and one end of the first ball valve 14 respectively. The second port of the fourth three-way stop valve 6 is connected to the third port of the fifth three-way stop valve 7, and the third port is connected to the second port of the fifth three-way stop valve 7. The first port of the fifth three-way stop valve 7 is connected to the first port of the pressure stabilizing tank 16. The other end of the first ball valve 14 is connected to the first port of the pressure stabilizing tank 16.

[0031] The first gas source uses nitrogen provided by a nitrogen tank or other device. The first gas circuit includes a first branch, a second branch and a sixth three-way stop valve 8. The first port of the sixth three-way stop valve 8 is connected to the first gas source. The second port of the sixth three-way stop valve 8 is connected to the second port of the pressure-suppressing tank 16 through the first branch. The first branch is provided with a pneumatic valve 20 and a first manual valve 18, and the pneumatic valve 20 is adjacent to the sixth three-way stop valve 8. The third port of the sixth three-way stop valve 8 is connected to the third port of the pressure-suppressing tank 16 through the second branch. The second branch is provided with a venturi tube 21, a first activated carbon tank and a second manual valve 19. The inlet end of the venturi tube 21 is connected to the third port of the sixth three-way stop valve 8, the contraction end is connected to the second manual valve 19, and the outlet end is connected to the first activated carbon tank through a muffler 22.

[0032] The second gas source is composed of a plurality of diaphragm pumps 23 connected in parallel, and the second gas circuit includes a second ball valve 15, a seventh three-way stop valve 9, an eighth three-way stop valve 10 and a second activated carbon canister, and the second gas source is arranged in the second gas circuit. The fourth port of the voltage regulator tube is connected to the second port of the seventh three-way stop valve 9 through the second ball valve 15, the first port of the seventh three-way stop valve 9 is connected to the first port of the eighth three-way stop valve 10 through the second gas source, the second port of the eighth three-way stop valve 10 is connected to the second activated carbon canister, and the third port is connected between the second ball valve 15 and the seventh three-way stop valve 9. The third port of the seventh three-way stop valve 9 is connected to the pipeline between the eighth three-way stop valve 10 and the second activated carbon canister.

[0033] The first activated carbon tank and the second activated carbon tank use activated carbon to adsorb the extracted gas to ensure personal safety and avoid environmental pollution. The controller is connected to a display screen, which is used to display the changes in the indications of the pressure gauge 17 and the flow meter 11.

[0034] A method for rapid online detection of a breathing valve is applied to the above-mentioned rapid online detection device for a breathing valve, including a positive pressure opening pressure measurement method, a positive pressure leakage measurement method, a negative pressure opening pressure measurement method, and a negative pressure leakage measurement method. The user can select the first gas source or the second gas source according to the actual situation on site. If there is a nitrogen source on site, the first gas source can be selected. If there is no gas source on site, the second gas source can be selected.

[0035] Due to the different effective areas caused by the reverse principle of the breathing valve, errors are caused in the positive pressure opening pressure and the negative pressure opening pressure. Therefore, a compensation algorithm is set in the controller to achieve compensation for the positive pressure opening pressure and the negative pressure opening pressure.

[0036] like Figure 2 As shown, before performing the positive pressure opening pressure measurement method, it is necessary to adjust each stop valve and regulating valve so that the first gas source or the second gas source is evacuated to 0.3 times the opening pressure of the breathing valve, and the indication of the flow meter 11 changes. If the indication of the flow meter 11 becomes 0 within 5 minutes, it indicates that the sealing part 1 is tightly connected with the positive pressure outlet of the breathing valve, and the positive pressure opening pressure measurement method can be performed.

[0037] The positive pressure opening pressure measurement method is to connect the sealing part 1 with the positive pressure outlet of the breathing valve, and then connect the sealing part 1 and the storage tank respectively through the differential pressure transmitter. The user switches each stop valve and regulating valve, and uses the first gas source or the second gas source to extract air to generate positive pressure. When the positive pressure is generated by the first gas source, the first manual valve 18 is closed and the second manual valve 19 is opened. The nitrogen passes through the sixth three-way stop valve 8 and intersects with the gas from the pressure-stabilizing tank 16 in the venturi tube 21, and then enters the first activated carbon tank through the muffler 22 to observe and record the changes in the pressure gauge 17 and the flow meter 11; when the positive pressure is generated by the second gas source, the gas from the pressure-stabilizing tank 16 passes through the second ball valve 15, the seventh three-way stop valve 9, the second gas source, and the eighth three-way stop valve 10 to enter the second activated carbon tank, and the changes in the pressure gauge 17 and the flow meter 11 are observed and recorded. The first gas source or the second gas source first stores energy for the pressure stabilizing tank 16, and finally opens the first ball valve 14, so that the gas from the storage tank passes through the breathing valve, the first three-way stop valve 3 and the first ball valve 14 in sequence and enters the pressure stabilizing tank 16.

[0038] There are two ways to obtain the positive pressure opening pressure: the first is to gradually increase the opening of the regulating valve, and observe the pressure curve and flow curve generated by the controller shown on the display screen, until the flow curve increases and the pressure curve is horizontal when the opening of the regulating valve is increased. The pressure at this time is the opening pressure of the breathing valve; the second is to quickly increase the opening of the regulating valve, and the pressure when the pressure curve tends to be horizontal after an inflection point appears is the opening pressure of the breathing valve.

[0039] like Figure 3 As shown, the positive pressure leakage measurement method is to release the pressure after the positive pressure opening pressure measurement method is completed. The controller obtains the positive pressure opening pressure obtained by the positive pressure opening pressure measurement method and forms the pressure for measuring the leakage. The pressure for measuring the leakage is 0.75 times the positive pressure opening pressure. Then switch the stop valve and the regulating valve so that the gas from the storage tank passes through the breathing valve, the first three-way stop valve 3, the third three-way stop valve 5, the second three-way stop valve 4, the fourth three-way stop valve 6 and the fifth three-way stop valve 7 in sequence and enters the pressure stabilizing tank 16. Continuously adjust each stop valve and regulating valve and observe the readings on the differential pressure gauge 2 and the pressure gauge 17 until the readings are stable.

[0040] The method for judging whether the breathing valve is qualified is that the staff pre-sets the set flow of the controller according to the diameter of the breathing valve, and reads the reading of the differential pressure gauge 2 after the readings of the differential pressure gauge 2 and the pressure gauge 17 are stable. If the reading of the differential pressure gauge 2 after correction and compensation is ≥ 75% of the positive or negative pressure opening pressure, it means that the breathing valve is qualified; if the reading of the differential pressure gauge 2 after correction and compensation is < 75% of the positive or negative pressure opening pressure, it means that the breathing valve is unqualified. The method for judging whether the breathing valve is qualified does not require specific measurement of the leakage of the breathing valve. It can quickly judge whether the breathing valve is qualified based on the reading of the differential pressure gauge after correction, which can greatly improve the detection efficiency of the breathing valve.

[0041] The method for obtaining the leakage amount is to continuously adjust the first metering valve 12 and adjust the differential pressure transmitter to the pressure for measuring the leakage amount. When the indication of the pressure gauge 17 is stable, the data displayed by the flow meter 11 is the positive pressure leakage amount.

[0042] like Figure 4 As shown, before performing the negative pressure measurement method, it is necessary to adjust the stop valves and regulating valves so that the first gas source or the second gas source is evacuated to 0.3 times the opening pressure of the breathing valve, and observe the changes in the reading of the flow meter 11. If the reading of the flow meter 11 becomes 0 within 5 minutes, it indicates that the sealing part 1 is tightly connected to the negative pressure outlet of the breathing valve, and the positive pressure opening pressure measurement method can be performed.

[0043] The negative pressure opening pressure measurement method is to connect the sealing part 1 with the negative pressure outlet of the breathing valve, and then connect the sealing part 1 and the storage tank respectively through the differential pressure transmitter, switch the stop valves and the regulating valve, and the first gas source or the second gas source generates negative pressure; when the first gas source generates negative pressure, open the first manual valve 18 and close the second manual valve 19, and the nitrogen passes through the sixth three-way stop valve 8, the pneumatic valve 20 and the first manual valve 18 to enter the pressure-stabilizing tank 16; when the second gas source generates negative pressure, the gas from the outside passes through the second activated carbon tank, the seventh three-way stop valve 9, the second gas source, the eighth three-way stop valve 10 and the second ball valve 15 to enter the pressure-stabilizing tank 16. The first gas source and the second gas source first store energy for the pressure-stabilizing tank 16, and finally open the first ball valve 14, so that the gas in the pressure-stabilizing tank 16 passes through the first ball valve 14 and the first three-way stop valve 3 to enter the breathing valve, and observe and record the changes in the indications of the pressure gauge 17 and the flow meter 11.

[0044] There are two ways to obtain the negative pressure opening pressure: the first is to gradually increase the opening of the regulating valve, and observe the pressure curve and flow curve generated by the controller shown on the display screen, until the flow curve increases and the pressure curve is horizontal when the opening of the regulating valve is increased. The pressure at this time is the opening pressure of the breathing valve; the second is to quickly increase the opening of the regulating valve, and the pressure when the pressure curve tends to be horizontal after an inflection point appears is the opening pressure of the breathing valve.

[0045] like Figure 5 As shown, the negative pressure leakage measurement method is to release the pressure after the negative pressure opening pressure measurement method is completed. The controller obtains the negative pressure opening pressure obtained by the negative pressure opening pressure measurement method and forms the pressure of the negative pressure leakage. Then, the stop valve and the regulating valve are switched so that the gas in the pressure regulating tank 16 passes through the fifth three-way stop valve 7, the fourth three-way stop valve 6, the third three-way stop valve 5, the second three-way stop valve 4 and the first three-way stop valve 3 to enter the breathing valve. The stop valves and regulating valves are continuously adjusted and the indications on the differential pressure gauge 2 and the pressure gauge 17 are observed until the indications are stable.

[0046] The method for judging whether the breathing valve is qualified is that the staff pre-sets the set flow of the controller according to the diameter of the breathing valve, and reads the reading of the differential pressure gauge 2 after the readings of the differential pressure gauge 2 and the pressure gauge 17 are stable. If the reading of the differential pressure gauge 2 at this time is ≥ 75% of the positive pressure or negative pressure opening pressure, it means that the breathing valve is qualified; if the reading of the differential pressure gauge 2 at this time is < 75% of the positive pressure or negative pressure opening pressure, it means that the breathing valve is unqualified.

[0047] The method for obtaining the leakage amount is to continuously adjust the second metering valve 13 and adjust the differential pressure transmitter to the pressure for measuring the leakage amount. When the indication of the pressure gauge 17 is stable, the data displayed by the flow meter 11 is the negative pressure leakage amount.

[0048] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A rapid online detection device for a breathing valve, characterized in that: It comprises a sealing part (1), a pressure-stabilizing tank (16), an air source, a plurality of stop valves, a plurality of regulating valves, a plurality of pressure gauges (17), a plurality of flow meters (11), and a controller, wherein the controller is respectively connected to each of the pressure gauges (17) and the flow meters (11); The sealing portion (1) is connected to the pressure-stabilizing tank (16) via a first adjustment pipeline section and a second adjustment pipeline section, wherein the first adjustment pipeline section comprises a first three-way stop valve (3), a second three-way stop valve (4) and a third three-way stop valve (5), and the components are connected via pipelines; the second adjustment pipeline section comprises a fourth three-way stop valve (6), a fifth three-way stop valve (7) and a first ball valve (14), and the components are connected via pipelines; The gas source comprises a first gas source and a second gas source, and the pressure-stabilizing tank (16) is connected to the first gas source and the second gas source respectively; A differential pressure gauge (2) is provided on the pipeline between the sealing portion (1) and the first adjustment pipeline section, and the differential pressure gauge (2) is connected to the controller.

2. A breathing valve rapid online detection device according to claim 1, characterized in that: The first port of the first three-way stop valve (3) is connected to the sealing portion (1), the second port is connected to the second port of the third three-way stop valve (5), and the third port is connected to the second port of the second three-way stop valve (4); the first port of the second three-way stop valve (4) is connected to the first port of the third three-way stop valve (5), and the third port is connected between the second port of the first three-way stop valve (3) and the second port of the third three-way stop valve (5); the third port of the third three-way stop valve (5) is connected between the third port of the first three-way stop valve (3) and the second port of the second three-way stop valve (4); A flow meter (11) is provided on the pipeline between the first port of the second three-way stop valve (4) and the first port of the third three-way stop valve (5), and the flow meter (11) is connected to the controller.

3. A breathing valve rapid online detection device according to claim 2, characterized in that: The second port of the third three-way stop valve (5) is connected to the first port of the fourth three-way stop valve (6) and one end of the first ball valve (14) respectively; the second port of the fourth three-way stop valve (6) is connected to the third port of the fifth three-way stop valve (7), and the third port is connected to the second port of the fifth three-way stop valve (7); the first port of the fifth three-way stop valve (7) is connected to the first port of the pressure-suppressing tank (16); and the other end of the first ball valve (14) is connected to the first port of the pressure-suppressing tank (16); A first metering valve (12) or a back pressure valve is provided on the pipeline between the second port of the fourth three-way stop valve (6) and the third port of the fifth three-way stop valve (7); A second metering valve (13) or a pressure reducing valve is provided on the pipeline between the third port of the fourth three-way stop valve (6) and the second port of the fifth three-way stop valve (7).

4. A rapid online detection device for a breathing valve according to claim 3, characterized in that: The pressure stabilizing tank (16) is connected to the first gas source via a first gas path, and is connected to the second gas source via a second gas path. The pressure stabilizing tank (16) is provided with a plurality of thermometers and a plurality of pressure gauges (17).

5. A breathing valve rapid online detection device according to claim 4, characterized in that: The first gas source is nitrogen, the first gas circuit comprises a first branch, a second branch and a sixth three-way stop valve (8), the first gas source is connected to one end of the first gas circuit and one end of the second gas circuit respectively through the sixth three-way stop valve (8), the other end of the first gas circuit is connected to the second port of the pressure stabilizing tank (16), and the other end of the second gas circuit is connected to the third port of the pressure stabilizing tank (16); The second gas circuit comprises a second ball valve (15), a seventh three-way stop valve (9), an eighth three-way stop valve (10) and a second activated carbon canister; the second gas source comprises a plurality of diaphragm pumps (23) connected in parallel; the fourth port of the pressure-stabilizing tank (16) is connected to the second port of the seventh three-way stop valve (9) via the second ball valve (15); the first port of the seventh three-way stop valve (9) is connected to the first port of the eighth three-way stop valve (10) via the second gas source; the second port of the eighth three-way stop valve (10) is connected to the second activated carbon canister; the third port is connected between the second ball valve (15) and the seventh three-way stop valve (9); the third port of the seventh three-way stop valve (9) is connected to the pipeline between the eighth three-way stop valve (10) and the second activated carbon canister.

6. A breathing valve rapid online detection device according to claim 5, characterized in that: The first port of the sixth three-way stop valve (8) is connected to the first gas source, the second port is connected to the first branch, and the third port is connected to the second branch; The first branch line is provided with a pneumatic valve (20) and a first manual valve (18), and the second branch line is provided with a venturi tube (21), a first activated carbon canister and a second manual valve (19); the inlet end of the venturi tube (21) is connected to the third port of the sixth three-way stop valve (8), the contraction end is connected to the second manual valve (19), and the outlet end is connected to the first activated carbon canister via a muffler (22).

7. A method for rapid online detection of a breathing valve, applied to a rapid online detection device for a breathing valve as described in claim 6, for measuring the positive pressure opening pressure, positive pressure leakage, negative pressure opening pressure and negative pressure leakage of the breathing valve, wherein a compensation algorithm is provided in the controller for compensating the positive pressure opening pressure and the negative pressure opening pressure, and characterized in that: Specifically, it includes the following sub-methods: A positive pressure opening pressure measurement method, after the sealing part (1) is connected to the positive pressure outlet of the breathing valve, the sealing part (1) and the storage tank are respectively connected through a pressure differential transmitter, and the stop valve and the regulating valve are switched. The first gas source or the second gas source generates positive pressure. When the first gas source generates positive pressure, the first manual valve (18) is closed and the second manual valve (19) is opened. Nitrogen passes through the sixth three-way stop valve (8) and intersects with the gas from the pressure regulating tank (16) in the venturi tube (21), and then passes through the muffler (22) into the first activated carbon tank. The pressure gauge (17) is observed and recorded. , the indication change of the flow meter (11); when the second gas source generates positive pressure, the gas from the pressure-stabilizing tank (16) passes through the second ball valve (15), the seventh three-way stop valve (9), the second gas source and the eighth three-way stop valve (10), and enters the second activated carbon tank, and the indication change of the pressure gauge (17) and the flow meter (11) is observed and recorded; the first gas source or the second gas source stores energy for the pressure-stabilizing tank (16), and then the first ball valve (14) is opened, so that the gas from the storage tank passes through the breathing valve, the first three-way stop valve (3) and the first ball valve (14) in sequence and enters the pressure-stabilizing tank (16); A positive pressure leakage measurement method, after the positive pressure opening pressure measurement method is completed, the pressure is released, the controller obtains the positive pressure opening pressure obtained by the positive pressure opening pressure measurement method, and forms a pressure for measuring the leakage, and then switches the stop valve and the regulating valve, so that the gas from the storage tank passes through the breathing valve, the first three-way stop valve (3), the third three-way stop valve (5), the second three-way stop valve (4), the fourth three-way stop valve (6) and the fifth three-way stop valve (7) in sequence and enters the pressure stabilizing tank (16), and the stop valves and regulating valves are continuously adjusted and the readings on the differential pressure gauge (2) and the pressure gauge (17) are observed until the readings are stable; A method for measuring negative pressure opening pressure, after the sealing part (1) is connected to the negative pressure outlet of the breathing valve, the sealing part (1) and the storage tank are respectively connected through a pressure differential transmitter, and the stop valve and the regulating valve are switched, and the first gas source or the second gas source generates negative pressure; when the first gas source generates negative pressure, the first manual valve (18) is opened and the second manual valve (19) is closed, and nitrogen enters the pressure regulating tank (16) through the sixth three-way stop valve (8), the pneumatic valve (20) and the first manual valve (18), and the pressure gauge (17) and the flow meter (20) are observed and recorded. 11); when the second gas source generates negative pressure, the gas from the outside enters the pressure-stabilizing tank (16) through the second activated carbon tank, the seventh three-way stop valve (9), the second gas source, the eighth three-way stop valve (10) and the second ball valve (15); the first gas source or the second gas source stores energy for the pressure-stabilizing tank (16), and then the first ball valve (14) is opened, so that the gas in the pressure-stabilizing tank (16) enters the breathing valve through the first ball valve (14) and the first three-way stop valve (3), and the changes in the indications of the pressure gauge (17) and the flow meter (11) are observed and recorded; A method for measuring negative pressure leakage, after the negative pressure opening pressure measurement method is completed, the pressure is released, the controller obtains the negative pressure opening pressure obtained by the negative pressure opening pressure measurement method, and forms the pressure of the negative pressure leakage, and then switches the stop valve and the regulating valve, so that the gas in the pressure regulating tank (16) passes through the fifth three-way stop valve (7), the fourth three-way stop valve (6), the third three-way stop valve (5), the second three-way stop valve (4) and the first three-way stop valve (3) and enters the breathing valve, and the stop valves and regulating valves are continuously adjusted and the readings on the differential pressure gauge (2) and the pressure gauge (17) are observed until the readings are stable; The method for judging the quality of the breathing valve is that the staff pre-sets the set flow of the controller according to the diameter of the breathing valve, and reads the reading of the differential pressure gauge (2) after stabilization. If the reading after correction and compensation is ≥ 75% of the positive pressure or negative pressure opening pressure, it means that the breathing valve is qualified; If the reading after correction and compensation is less than 75% of the positive pressure or negative pressure opening pressure, it means that the breathing valve is unqualified.

8. A method for rapid online detection of a breathing valve according to claim 7, characterized in that: Before performing the positive pressure or negative pressure opening pressure measurement method, it is necessary to adjust each of the stop valves and regulating valves so that the first gas source or the second gas source is evacuated to 0.3 times the opening pressure of the breathing valve, and observe the change in the indication of the flow meter (11). If the indication of the flow meter (11) becomes 0 within 5 minutes, it indicates that the sealing part (1) is tightly connected to the outlet of the breathing valve.

9. A method for rapid online detection of a breathing valve according to claim 7, characterized in that: The controller is connected to a display screen, and the display screen is used to display changes in the indications of the pressure gauge (17) and the flow meter (11); There are two ways to obtain the positive pressure opening pressure or the negative pressure opening pressure: the first is to gradually increase the opening of the regulating valve and observe the pressure curve and the flow curve shown on the display screen until the flow curve increases and the pressure curve is horizontal when the opening of the regulating valve is increased. The pressure at this time is the opening pressure of the breathing valve; the second is to quickly increase the opening of the regulating valve, and the pressure when the pressure curve tends to be horizontal after an inflection point appears is the opening pressure of the breathing valve.

10. A method for rapid online detection of a breathing valve according to claim 7, characterized in that: A method for obtaining leakage volume, wherein the pressure for measuring leakage volume is 0.75 times the opening pressure of positive pressure or negative pressure, the first metering valve (12) or the second metering valve (13) is continuously adjusted, and the differential pressure transmitter is adjusted to the pressure for measuring leakage volume. When the indication of the pressure gauge (17) is stable, the data displayed by the flow meter (11) is the positive pressure or negative pressure leakage volume.

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