Device and method for testing opening pressure and leakage of a breather valve

Abstract

The present application relates to the detection device and method of testing the opening pressure and leakage of breathing valve, wherein the detection device comprises air compressor unit, filter, regulating valve, pressure storage tank, first electric valve, second electric valve, flow meter group, first needle type regulating valve, third electric valve, fourth electric valve and test platform connected in turn through pipeline. The first needle type regulating valve is connected with first PC module, the first PC module is connected with three pressure sensors, the output end of the first needle type regulating valve is connected with fifth electric valve, and the fifth electric valve is connected with three pressure sensors respectively. The output end of the first electric valve is connected with sixth electric valve, the sixth electric valve is connected with second needle type regulating valve, the second needle type regulating valve is connected with second PC module, the second PC module is connected with three pressure sensors, the second needle type regulating valve is connected with seventh electric valve, and the output end of the seventh electric valve is connected with detection platform. It can test the opening pressure and leakage of breathing valve back pressure as positive pressure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of breathing valve detection, in particular to a detection device and method for testing opening pressure and leakage of a breathing valve. BACKGROUND

[0002] The breathing valve refers to a valve that can ensure that the space of a storage tank is isolated from the atmosphere within a certain pressure range, and can be communicated with the atmosphere (breathing) when exceeding or being lower than the pressure range. The function of the breathing valve is to prevent the storage tank from being damaged due to overpressure or vacuum, and to reduce the evaporation loss of the storage liquid. The setting of the breathing valve can not only reduce the emission of tank gas, thereby reducing the pollution to the atmosphere, but also can make the pressure storage tank avoid damage due to overpressure or instability due to over-vacuum, thereby promoting safety and environmental protection.

[0003] In the prior art, the existing device for testing the breathing valve in China is too simple, and the precision far fails to meet the standard of the test requirement. At the same time, the detection of the breathing valve when the back pressure is positive pressure is not perfect, so there is still a blank in the detection aspect. However, there is no device for testing the opening pressure and leakage of the breathing valve when the back pressure is positive pressure in China at present, so it is impossible to determine whether the opening pressure and leakage of the produced breathing valve meet the relevant industry standards, and therefore, a detection device for testing the opening pressure and leakage of the breathing valve is urgently needed. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a detection device and method for testing the opening pressure and leakage of a breathing valve, which can test the opening pressure and leakage of the breathing valve when the back pressure is positive pressure in real time, so as to screen out unqualified products and improve the yield of the products.

[0005] The above application purpose of the present application is realized by the following technical scheme:

[0006] The detection device for testing the opening pressure and leakage of the breathing valve comprises, through a pipeline, an air compressor unit, a filter, a regulating valve, a pressure storage tank, a first electric valve, a second electric valve, a flow meter group, a first needle type regulating valve, a third electric valve, a fourth electric valve and a test platform connected in sequence.

[0007] The first needle type regulating valve is connected with a first PC module, the first PC module is connected with three pressure sensors, the output end of the first needle type regulating valve is connected with a fifth electric valve, and the fifth electric valve is connected with the three pressure sensors respectively.

[0008] The output end of the first electric valve is connected with a sixth electric valve, the sixth electric valve is connected with a second needle type regulating valve, the second needle type regulating valve is connected with a second PC module, the second PC module is connected with three pressure sensors, the second needle type regulating valve is connected with a seventh electric valve, and the output end of the seventh electric valve is connected with a detection platform, and the detection platform is provided with a back pressure connection port of a product to be detected, and the back pressure connection port is connected with the pipeline of the output end of the seventh electric valve.

[0009] In a preferred example, the application can be further configured that a manual valve is arranged on the pipeline between the filter and the air compressor set.

[0010] In a preferred example, the application can be further configured that the air compressor set comprises a centrifugal air compressor, a freeze dryer and an air tank, and the air compressor set is used to provide compressed air to provide positive pressure for the breathing valve.

[0011] In a preferred example, the application can be further configured that the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, the sixth electric valve and the seventh electric valve are all electric ball valves.

[0012] In a preferred example, the application can be further configured that the flow meter set comprises a first flow meter, a second flow meter and a third flow meter, the output end of the second electric valve is connected with the input end of the first flow meter;

[0013] The input ends of the second flow meter and the third flow meter are respectively connected with the first electric valve through electric ball valves, and the output ends of the second flow meter and the third flow meter are connected with the first needle type regulating valve.

[0014] In a preferred example, the application can be further configured that the flow of the first flow meter is 50 SCCM, the flow of the second flow meter is 1000 SCCM, and the flow of the third flow meter is 20000 SCCM.

[0015] In a preferred example, the application can be further configured that the detection platform is a To BV detection platform or a KB detection platform.

[0016] The detection method for testing the opening pressure and leakage amount of the breathing valve, the actuation test of the breathing valve back pressure being positive pressure, and the positive pressure opening pressure and leakage amount detection comprise the following steps:

[0017] Step 1. The air compressor set is started and outputs a continuous and stable pressure to the pipeline;

[0018] Step 2. After the continuous and stable pressure passes through the filter, the clean compressed gas passes through the regulating valve and enters the pressure storage tank for storage.

[0019] Step 3. The gas in the pressure tank passes through the first electric valve and the second electric valve, and selects one of the three appropriate flow meters to flow through according to the flow rate required for subsequent detection;

[0020] Step 4. The gas from the flow meter passes through the first needle valve, which transmits the relevant data to the first PC module, thereby forming a digital screen for intuitive confirmation.

[0021] Step 5. The gas from the first needle valve is transmitted to the three pressure sensors through the fifth electric valve. The pressure sensors then send the received pressure information to the first PC module to form an effective fluctuation image.

[0022] Step 6. The air source pressure enters the test platform through the third and fourth electric valves to effectively and correctly test the relevant products that need to be tested, and record and save the relevant data.

[0023] Step 7. The air compressor unit starts and outputs a continuous and stable pressure to the pipeline;

[0024] Step 8. After passing through the filter, the clean compressed gas, under continuous and stable pressure, enters the pressure storage tank for storage through the regulating valve;

[0025] Step 9. The gas in the pressure tank passes through the first electric valve and the sixth electric valve, and reaches the second needle regulating valve. The second needle regulating valve transmits the relevant data to the second PC module, thereby forming a digital screen for intuitive confirmation.

[0026] Step 10. The gas pressure from the second needle valve is transmitted to the three pressure sensors, and the three pressure sensors then send the received pressure information to the second PC module to form an effective fluctuation image.

[0027] Step 11. The positive pressure from the pipeline reaches the testing platform through the seventh electric valve. The testing platform is then connected to the back pressure connection port of the product being tested via a connecting pipe. The opening pressure and leakage of the product with positive back pressure are effectively and correctly detected, and the relevant data are recorded and saved.

[0028] Step 12. The test of the opening pressure and leakage of the breather valve with positive back pressure is completed.

[0029] In summary, the present invention has at least the following beneficial technical effects:

[0030] The application discloses a kind of detection device and method for testing the opening pressure and leakage of breathing valve, when detecting, first compressed air output by compressor is rectified by pressure storage tank, can greatly overcome the fluctuation of air pressure, to ensure the stability of test air pressure.The integration degree of electrical system, air pressure system, measurement system, test record output system and pipeline system is high, to ensure high accuracy and stability.When the breathing valve test positive pressure actuation, open a pipeline, there is air compressor to provide positive pressure, while opening another pipeline, so that the second pipeline provides a positive pressure to the first pipeline, to facilitate the observation of the numerical change of flow transmitter and pressure transmitter.

[0031] According to different test requirements, by controlling the pipeline flow channel of test air pressure, the pipeline and equipment components can be switched and used in combination, so that various test requirements under different conditions can be met, and the operation is convenient and the function is powerful. And using this detection device can test the opening pressure and leakage of the breathing valve back pressure as positive pressure in real time, so as to screen out unqualified products and improve the yield of products. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the overall structure diagram of the application.

[0033] Figure 2 It is the overall structure schematic diagram of the test platform of the application.

[0034] Figure 3 It is the structure schematic diagram of the emergency relief valve testing device of the application.

[0035] Fig. 1, air compressor unit; 2, filter; 3, regulating valve; 4, pressure storage tank; 5, first electric valve; 6, second electric valve; 7, flowmeter group; 8, first needle type regulating valve; 9, third electric valve; 10, fourth electric valve; 11, test platform; 111, connecting pipeline; 112, clamping chuck; 113, gas source interface; 1100, emergency relief valve testing device; 1101, second connecting pipe; 12, first PC module; 13, pressure sensor; 14, fifth electric valve; 15, sixth electric valve; 16, second needle type regulating valve; 17, second PC module; 18, seventh electric valve; 19, detection platform; 20, manual valve; 21, first flowmeter; 22, second flowmeter; 23, third flowmeter. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative characteristics, purposes and effects of the application easy to understand, the application will be further described below in combination with specific examples.

[0037] Example 1:

[0038] The detection device for testing the opening pressure and leakage of the breathing valve comprises, in sequence through pipelines, an air compressor set 1, a filter 2, a regulating valve 3, a pressure storage tank 4, a first electric valve 5, a second electric valve 6, a flow meter set 7, a first needle type regulating valve 8, a third electric valve 9, a fourth electric valve 10 and a test platform 11.

[0039] The first needle type regulating valve 8 is connected with a first PC module 12, the first PC module 12 is connected with three pressure sensors 13, the output end of the first needle type regulating valve 8 is connected with a fifth electric valve 14, and the fifth electric valve 14 is connected with the three pressure sensors 13 respectively.

[0040] The output end of the first electric valve 5 is connected with a sixth electric valve 15, the sixth electric valve 15 is connected with a second needle type regulating valve 16, the second needle type regulating valve 16 is connected with a second PC module 17, the second PC module 17 is connected with the three pressure sensors 13, the second needle type regulating valve 16 is connected with a seventh electric valve 18, and the output end of the seventh electric valve 18 is connected with a detection platform 19, and the detection platform 19 is provided with a back pressure connecting port of the detected product, and the back pressure connecting port is connected with the pipeline of the output end of the seventh electric valve 18.

[0041] A manual valve 20 is arranged on the pipeline between the filter 2 and the air compressor set 1. In this way, the opening and closing degree of the valve pipeline can be realized by manually adjusting the manual valve 20. The filter 2 can make the compressed gas passing through the pipeline cleaner, so as to avoid affecting the detection accuracy of the precision equipment. The regulating valve 3 can detect the pressure in the pressure storage tank 4 (VT1) and control the valve opening degree in real time, the pressure storage tank 4 can store and maintain the pressure of the compressed air from the air compressor, and ensure that the whole pipeline continuously and stably outputs positive pressure. In the embodiment, the first PC module 12 and the second PC module 17 are both PC digital displays, and the first needle type regulating valve 8 can send the pressure signal and flow to the PC digital display for real-time digital monitoring and control.

[0042] The air compressor set 1 comprises a centrifugal air compressor, a freeze dryer and a gas storage tank, and is used for providing compressed air to provide positive pressure for the breathing valve.

[0043] The air compressor set 1 is used for providing compressed air, the maximum continuously and stably output pressure level is 15KPa air, the air volume is 17000m3 / h, and the positive pressure system can be provided for the DN50-DN100 full series breathing valve.

[0044] The first electric valve 5, the second electric valve 6, the third electric valve 9, the fourth electric valve 10, the fifth electric valve 14, the sixth electric valve 15 and the seventh electric valve 18 are all electric ball valves.

[0045] The electric ball valve can realize the opening and closing of the valve pipeline through the electrical switch.

[0046] The flow meter group 7 includes a first flow meter 21, a second flow meter 22, and a third flow meter 23, the output end of the second electric valve 6 is connected with the input end of the first flow meter 21;

[0047] The input end of the second flow meter 22 and the third flow meter 23 are respectively connected with the first electric valve 5 through the electric ball valve, and the output end of the second flow meter 22 and the third flow meter 23 are connected with the first needle type regulating valve 8.

[0048] The flow of the first flow meter 21 is 50 SCCM, the flow of the second flow meter 22 is 1000 SCCM, and the flow of the third flow meter 23 is 20000 SCCM.

[0049] The electric ball valve can be divided into three paths for testing (according to the different requirements of the flow, the selection can be carried out):

[0050] One path: 50 SCCM (AV2);

[0051] Two paths: 1000 SCCM (AV3);

[0052] Three paths: 20000 SCCM (AV4);

[0053] The opening and closing of the valve pipeline can be realized through the electrical switch.

[0054] The flow meter can be divided into three paths for testing (according to the different requirements of the flow, the selection can be carried out):

[0055] One path: 50 SCCM (F11);

[0056] Two paths: 1000 SCCM (F12);

[0057] Three paths: 20000 SCCM (F13).

[0058] The detection platform 19 is a To BV detection platform or a KB detection platform.

[0059] The detection platform 19 of the product has high precision and stability, and can be used for independent single measurement and online measurement of any two combinations for the whole type nitrogen seal valve with nitrogen addition and pressure regulation within DN10~DN100 caliber, can test back pressure, overpressure value, and can verify its interference.

[0060] Among them, refer to Figure 2This is a schematic diagram of the overall structure of the test platform 11 in this invention, used for testing breathing valves and constant pressure breathing valves. In this embodiment, the external dimensions of the test platform 11 are preferably 1000mm x 700mm x 300mm. Holes with a depth of 250mm and a diameter of DN25~DN350 are machined into its surface. The sides are connected to the connecting pipe 111 through openings, and each hole is equipped with a blind flange, which is used to cover it when not in use to prevent air leakage. Each test port is equipped with a dedicated clamping chuck 112 for easier product clamping. The air source interface 113 is a G1 / 4 stainless steel through-plate connector.

[0061] Preferably, in this embodiment, as Figure 3 As shown, an emergency relief valve testing device 1100 is also provided. In this embodiment, its external dimensions are preferably 800mm x 800mm x 300mm. An internal deep hole with a diameter of 600mm and a depth of 250mm is pre-drilled, and bolt holes for fixing the product are located around the perimeter. An air inlet is located on the side for connection to the second connecting pipe 1101, using a threaded connection pipe. The air source interface is a G1 / 4 stainless steel through-plate connector.

[0062] The testing platform 19 includes a working platform 191, a platform frame 192 at the bottom of the working platform 191, four feet 193 around the bottom of the platform frame 192, a disc 194 on the working platform 191, a sealing disc 120 on the disc 194, and a cylindrical gas chamber 195 connected to a gas pipeline on the sealing disc 120. The gas pipeline is connected to the seventh electric valve 18 via a gas source flange 202 and other pipes. Three positioning protrusions 196 are evenly distributed on the outer side of the disc 194. Three guide pillars 197 with the center of the disc 194 as a reference are provided on the working platform 191. A rotating shaft 199 is rotatably mounted inside the guide pillar 197. A handwheel 200 is fixedly connected to the bottom of the rotating shaft 199. A pressure plate assembly 201 with horizontally adjustable position is provided at the end of the rotating shaft 199 away from the handwheel 200.

[0063] The emergency relief valve testing machine is driven by a screw handwheel 200, providing stable clamping force output and adjustable clamping force. The handwheel 200 has a self-holding function and a stop-and-hold function at any position. The screw of handwheel 200 drives the pressure plate assembly 201 in reciprocating motion without jamming. The pressure plate in the pressure plate assembly 201 can be manually extended and retracted flexibly to adapt to different specifications of breather valves, with a wide applicable size range. High-strength soft gaskets are used at the contact surfaces between the pressure plate and the flange to prevent indentation damage to the flange. Large-diameter O-ring seals are preferred, providing a wide sealing surface, excellent sealing effect, and long service life. Wear parts should be interchangeable and easy to replace, facilitating installation and maintenance.

[0064] The device has the functions of fast and accurate centering of the flange of the valve to be tested by the positioning block 196, providing operation efficiency and improving sealing effect. The device can quickly and accurately position the position of the pressing plate through the scale, and accurately and quickly clamp valves of different specifications. The emergency relief valve testing machine is provided with a temperature and humidity sensor and has the functions of synchronously collecting the inside of the flow channel and detecting the temperature and humidity data. The device has a safety protection function, a safe distance is reserved between all moving parts, the clamp action can be stopped at any time, and a safety sign is arranged on the platform.

[0065] In operation, the scale is referred to, the pressing plate is manually adjusted to extend, and the copper pad of the pressing plate is aligned with the position of the flange. The hand wheel 200 and the screw rod drive the pressing plate assembly 201, so as to press the flange of the valve to be tested.

[0066] Embodiment two:

[0067] The application further discloses a detection method for testing opening pressure and leakage of a breathing valve.

[0068] Step 1. The air compressor unit 1 is started and outputs a continuous and stable pressure to the pipeline.

[0069] Step 2. The continuous and stable pressure passes through the filter 2, and the clean compressed gas passes through the adjusting valve 3 into the pressure storage tank 4 for storage.

[0070] Step 3. The gas in the pressure storage tank 4 passes through the first electric valve 5 and the second electric valve 6, and according to the required flow in the latter detection, one of the three flowmeters suitable for the flow is selected.

[0071] Step 4. The gas from the flowmeter passes through the first needle type adjusting valve 8, and the first needle type adjusting valve 8 transmits relevant data to the first PC module 12, so as to form a digital picture for intuitive confirmation.

[0072] Step 5. The gas from the first needle type adjusting valve 8 is conducted to the three pressure sensors 13 through the fifth electric valve 14, and the pressure sensors 13 send the received pressure information to the first PC module 12 to form an effective fluctuation picture.

[0073] Step 6. The gas source pressure passes through the third electric valve 9 and the fourth electric valve 10 into the test platform 11, effectively and correctly detects the products related to the detection items, and records and saves the relevant data.

[0074] Step 7. The air compressor unit 1 is started and outputs a continuous and stable pressure to the pipeline.

[0075] Step 8. After the continuous stable pressure passes through the filter 2, the clean compressed gas enters the pressure storage tank 4 through the regulating valve 3 for storage;

[0076] Step 9. The gas in the pressure storage tank 4 passes through the first electric valve 5 and the sixth electric valve 15 to reach the second needle regulating valve 16, which transmits relevant data to the second PC module 17 to form a digital picture for intuitive confirmation.

[0077] Step 10. The gas pressure from the second needle regulating valve 16 is conducted to the three pressure sensors 13, which send the received pressure information to the second PC module 17 to form an effective fluctuation picture.

[0078] Step 11. The positive pressure from the pipeline passes through the seventh electric valve 18 to reach the detection platform 19, which is then connected to the back pressure connection port of the product to be detected on the detection platform 19. The opening pressure and leakage of the product back pressure for positive pressure are effectively and correctly detected, and the relevant data are recorded and saved.

[0079] Step 12. The opening pressure and leakage of the breathing valve back pressure for positive pressure test are completed.

[0080] The implementation principle of the embodiment is that the application discloses a detection device and steps for testing the opening pressure and leakage of a breathing valve. During detection, the compressed air output by a compressor is rectified through the pressure storage tank 4, which can greatly overcome the fluctuation of air pressure, thereby ensuring the stability of the test air pressure. The integration degree of the electrical system, air pressure system, measurement system, test record output system, and pipeline system is high, ensuring high accuracy and stability. When the breathing valve is tested under positive pressure actuation, one pipeline is opened, and the air compressor provides positive pressure. At the same time, another pipeline is opened, and the second pipeline provides a positive pressure influence to the first pipeline, thereby facilitating the observation of the value changes of the flow transmitter and the pressure transmitter.

[0081] According to different test requirements, the control of the pipeline flow path through which the test air pressure passes can be performed, the pipeline and equipment components can be switched and combined for use, various test requirements under different conditions can be met, the operation is convenient, and the function is powerful. Moreover, the detection device can be used to test the opening pressure and leakage of the breathing valve back pressure for positive pressure in real time, thereby screening out unqualified products and improving the yield of the products.

[0082] The basic principles, main features, and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above embodiments, and various changes and improvements can be made without departing from the spirit and scope of the application. These changes and improvements fall within the scope of the application claimed. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A device for testing the opening pressure and leakage of a breathing valve, characterized in that: The air compressor unit (1), the filter (2), the regulating valve (3), the pressure storage tank (4), the first electric valve (5), the second electric valve (6), the flow meter group (7), the first needle type regulating valve (8), the third electric valve (9), the fourth electric valve (10) and the test platform (11) are connected in sequence through pipelines. The first PC module (12) is connected with the first needle type regulating valve (8), and the first PC module (12) is connected with three pressure sensors (13). The output end of the first electric valve (5) is connected with the sixth electric valve (15), and the sixth electric valve (15) is connected with the second needle type regulating valve (16).

2. The test device for testing the opening pressure and the leakage of a breathing valve according to claim 1, wherein: The filter (2) and the air compressor unit (1) are provided with a manual valve (20) on the pipeline.

3. The apparatus of claim 1, wherein: The air compressor unit (1) includes a centrifugal air compressor, a freeze dryer and a gas storage tank, and is used to provide compressed air for the respiratory valve to provide positive pressure.

4. The apparatus of claim 1, wherein: The first electric valve (5), the second electric valve (6), the third electric valve (9), the fourth electric valve (10), the fifth electric valve (14), the sixth electric valve (15) and the seventh electric valve (18) are all electric ball valves.

5. The apparatus of claim 1, wherein: The flow meter group (7) includes a first flow meter (21), a second flow meter (22) and a third flow meter (23), and the output end of the second electric valve (6) is connected with the input end of the first flow meter (21). The input ends of the second flow meter (22) and the third flow meter (23) are respectively connected with the first electric valve (5) through electric ball valves, and the output ends of the second flow meter (22) and the third flow meter (23) are connected with the first needle type regulating valve (8).

6. The test device of claim 5, wherein: The flow of the first flow meter (21) is 50 SCCM, the flow of the second flow meter (22) is 1000 SCCM, and the flow of the third flow meter (23) is 20000 SCCM.

7. The apparatus of claim 1, wherein: The detection platform (19) is a To BV detection platform or a KB detection platform.

8. A method of testing the opening pressure and leakage of a breathing valve, characterized by: The actuation test of the respiratory valve back pressure as positive pressure, the positive pressure opening pressure and the leakage amount detection include the following steps: Step 1. The air compressor unit (1) is started and outputs a continuous and stable pressure to the pipeline. Step 2. After the continuous and stable pressure passes through the filter (2), the clean compressed gas passes through the regulating valve (3) and enters the pressure storage tank (4) for storage. Step 3. The gas in the pressure tank (4) passes through the first electric valve (5) and the second electric valve (6), and according to the required flow rate of the latter section detection, one of the three corresponding flow meters is selected to pass through; Step 4. The gas from the flow meter passes through the first needle type regulating valve (8), which transmits relevant data to the first PC module (12), thereby forming a digital picture for intuitive confirmation; Step 5. The gas from the first needle type regulating valve (8) is conducted to the three pressure sensors (13) through the fifth electric valve (14), and the pressure sensors (13) send the received pressure information to the first PC module (12) to form an effective fluctuation picture; Step 6. The gas source pressure enters the test platform (11) through the third electric valve (9) and the fourth electric valve (10), detects the products required for various detection items, and records and saves the relevant data; Step 7. The air compressor unit (1) is started and outputs continuous and stable pressure to the pipeline; Step 8. After the continuous and stable pressure passes through the filter (2), the clean compressed gas enters the pressure tank (4) through the regulating valve (3) for storage; Step 9. The gas in the pressure tank (4) passes through the first electric valve (5) and the sixth electric valve (15) to reach the second needle type regulating valve (16), which transmits relevant data to the second PC module (17), thereby forming a digital picture for intuitive confirmation; Step 10. The gas pressure from the second needle type regulating valve (16) is conducted to the three pressure sensors (13), and the three pressure sensors (13) send the received pressure information to the second PC module (17) to form an effective fluctuation picture; Step 11. The positive pressure from the pipeline passes through the seventh electric valve (18) to reach the detection platform (19), and the detection platform (19) is connected to the back pressure connection port of the product to be detected on the detection platform (19) through a connecting pipe. The opening pressure and leakage of the product back pressure as positive pressure are detected, and the relevant data are recorded and saved; Step 12. The opening pressure and leakage of the breathing valve back pressure as positive pressure test are completed.

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