Clamp with air valve structure with shortened leak hunting auxiliary time and gas supply line system and method thereof

Abstract

The present application belongs to the technical field of fuel cell detection, and discloses a clamp with a gas valve structure for shortening auxiliary time for leakage detection, a gas supply line system and a method thereof. A first sealing member is embedded in a first clamp plate, and a second sealing member is embedded in a second clamp plate. A shunt inlet valve and a shunt gas pressure gauge are arranged on each branch pipeline of a group of common passages of the second clamp plate in sequence. A front discharge valve and a front flow meter are arranged after the shunt gas pressure gauge on each branch pipeline of the second clamp plate. A gas source flow meter arranged on a main pipeline of the second clamp plate is omitted, and a group of common passages connected with the second clamp plate and provided with a rear discharge valve, a shunt outlet valve and a rear flow meter are omitted. The present application reduces the number of action execution times of related conventional on-off valves in the detection process and the dead volume of process cooperation, thereby shortening the auxiliary time for execution. The present application is beneficial to improving detection sensitivity, reducing equipment wear, reducing maintenance and reducing power consumption.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fuel cell detection, and relates to a clamp with a gas valve structure for shortening auxiliary time for leak detection, a gas supply line system and a method thereof, in particular to a method for accelerating the detection pace of the gas performance of a measured piece on a production line and a clamp structure with a specially designed gas valve. BACKGROUND

[0002] The production process of a fuel cell includes many links. Only considering the product quality of a single cell, before the final product is stacked, many tests related to sealing performance need to be performed. According to different specific process settings, according to technical indicators and part process descriptions, generally including the following or more: the sealing performance of various stages of single plates, bipolar plates, single cells and short stacks, membrane electrode air tightness, interplate air tightness, etc.

[0003] Generally, the number of cell units of an electric stack is generally between tens and hundreds. The closing operation of the clamp for the measured piece used in the above-mentioned detection process may need to be performed tens of thousands of times a day, which is very high in terms of cost and service life of the clamp, and is also very high in terms of the requirement for fast production pace.

[0004] There are many methods to accelerate the production speed or pace, such as increasing the production line, increasing the power of the actuator, increasing the fluid power and fluid consumption, and setting up parallel detection devices on a single production line, but these means may significantly increase the cost, and may also increase the wear of the equipment due to the increase in power. SUMMARY

[0005] In view of the above problems, it may be more beneficial to reduce the key adverse factors in the detection pace structure and accelerate the speed of a single detection line through technical means. For example, optimized use method, reducing the number of valve switches, reducing the displacement time and compressed gas consumption required by the dead volume in the process space, these methods will reduce the execution time, reduce the power consumption, reduce the equipment wear, and improve the detection sensitivity, these measures are beneficial to reduce the cost, reduce the failure, and improve the production pace speed.

[0006] The present application proposes a clamp with a gas valve structure for shortening auxiliary time for leak detection, a gas supply line system and a method thereof. The use of the system and method improves the test control technology, reduces the number of execution times of the related conventional switch valves in the detection process and the dead volume of the process cooperation, thereby shortening the auxiliary time of execution.

[0007] The present application adopts the following technical solutions:

[0008] The utility model relates to a clamp and gas supply line system with gas valve structure shortening leak detection auxiliary time, first clamping plate is embedded with first sealing piece, second clamping plate is embedded with second sealing piece, gas source enters the branch pipe of each branch of the public passage of second clamping plate respectively and is equipped with shunt inlet valve and shunt pressure gauge in proper order, the shunt pressure gauge of each branch pipe of second clamping plate is equipped with front discharge valve and front flowmeter respectively after the gas source, the gas source flowmeter arranged on the main pipe of second clamping plate is omitted, the public passage with rear discharge valve, shunt outlet valve and rear flowmeter connected with second clamping plate is omitted, the public passage refers to the fluid distribution pipe between the measured piece and second clamping plate, and the measured piece includes single pole plate, bipolar plate, single cell and short stack.

[0009] Further, the front flowmeter of each branch pipe of the gas source into the second clamping plate is provided with a linkage valve after the front flowmeter and in the second clamping plate respectively, and the linkage valve group is composed of a plurality of linkage valves, the second clamping plate includes a second clamping plate sealing plate and a second clamping plate transmission plate, the second clamping plate sealing plate is provided with a clamping plate air inlet passage, the clamping plate air inlet passage is concentric with the measured piece public passage, the linkage valve is arranged between the second clamping plate sealing plate and the second clamping plate transmission plate, and is arranged at the concentric hole of the measured piece public passage and the clamping plate air inlet passage, the power rod is inserted into the second clamping plate transmission plate and is screwed, the guide rod passes through the guide hole of the second clamping plate transmission plate, the guide rod is located in the upper part of the second clamping plate transmission plate and is screwed with the outer nut of the guide rod, and is connected and fixed with the second clamping plate transmission plate, the lower part of the second clamping plate transmission plate is screwed with the second clamping plate sealing plate, the second clamping plate sealing plate and the second clamping plate transmission plate are sequentially connected with the washer B, the main spring and the washer A, the guide rod above the washer A has a ring-shaped guide rod with a limiting device, wherein the guide rod, the ring-shaped guide rod with the limiting device and the power rod are concentric.

[0010] Further, the front flowmeter of each branch pipe of the gas source into the second clamping plate is provided with a linkage valve after the front flowmeter and in the second clamping plate respectively, and the linkage valve group is composed of a plurality of linkage valves, the second clamping plate includes a second clamping plate sealing plate and a second clamping plate transmission plate, the second clamping plate sealing plate is provided with a clamping plate air inlet passage, the clamping plate air inlet passage is concentric with the measured piece public passage, the linkage valve is arranged between the second clamping plate sealing plate and the second clamping plate transmission plate, and is arranged at the concentric hole of the measured piece public passage and the clamping plate air inlet passage, the power rod is inserted into the second clamping plate transmission plate and is screwed, the guide rod passes through the guide hole of the second clamping plate transmission plate, the guide rod is located in the upper part of the second clamping plate transmission plate and is screwed with the outer nut of the guide rod, and is connected and fixed with the second clamping plate transmission plate, the lower part of the second clamping plate transmission plate is screwed with the second clamping plate sealing plate, the second clamping plate sealing plate and the second clamping plate transmission plate are sequentially connected with the washer B, the main spring and the washer A, the guide rod above the washer A has a ring-shaped guide rod with a limiting device, wherein the guide rod, the ring-shaped guide rod with the limiting device and the power rod are concentric.

[0011] Further, the outer fixed ring of the valve core of the linkage valve is fixed on the threaded hole of the second clamping plate transmission plate by the surface thread, and the valve core is connected from the second clamping plate transmission plate to the second clamping plate sealing plate, and the fixed ring gasket, the outer spring of the valve core, the outer gasket of the valve core, the outer sealing ring of the valve core and the valve seat are sequentially connected, the part of the valve core in the valve seat has an annular step valve head, the annular step and the step surface of the inner hole of the valve seat form a supporting contact surface, the annular step is sleeved with the inner sealing ring of the valve core, the valve seat has a sealing surface between the valve seat and the second clamping plate sealing plate, the second clamping plate sealing plate has an exhaust sealing ring at the position corresponding to the sealing surface, the exhaust sealing ring is placed in the exhaust sealing groove on the second clamping plate sealing plate, and the valve seat has a lateral third hole connected with the gas connection pipe in a threaded manner, and the gas connection pipe has a gas connection pipe sealing ring between the gas connection pipe and the valve seat.

[0012] A method for shortening the auxiliary time of leak detection, comprising the following steps:

[0013] Step S1: the clamp is in an open state, and the measured member is placed between the first clamping plate and the second clamping plate;

[0014] Step S2: the clamp is closed;

[0015] Step S3: outer leakage test, open all shunt air inlet valves, continue for a first specified time, reach a specified air inlet pressure original value, continue for a second specified time, record the stable value of the flow of the front flow meter, compare the flow of the front flow meter with the standard value; if the flow value of any one front flow meter exceeds the standard value, the shunt air inlet valve is immediately closed, an alarm is given, and manual inspection is performed; if the flow of all front flow meters does not exceed the standard value, the next step is performed;

[0016] Step S4: inner leakage detection, select to close the shunt air inlet valves of any two routes, A route and B route, and the remaining one route is called C route, simultaneously open the front exhaust valves 19 of the A route and the B route, continue for a third specified time, monitor the flow of the C route, if the flow of the C route exceeds the standard value, the C route shunt air inlet valve is immediately closed, an alarm is given, and manual inspection is performed; if the flow of the C route does not exceed the standard value, the C route shunt air inlet valve is closed, and the front exhaust valve of the C route is opened;

[0017] Step S5: return to step S4 to change the selection of the first route, and detect the flow of the A route and the B route respectively;

[0018] Step S6: open the clamp;

[0019] Step S7: remove the measured member.

[0020] A method for shortening the auxiliary time of leak detection, comprising the following steps:

[0021] Step S1: the clamp is in an open state, and the measured piece is placed between the first clamping plate and the second clamping plate;

[0022] Step S2: external leakage test, while step S1 is performed, all shunt air inlet valves are opened, the clamp is closed, and a first specified time is maintained, a specified air inlet pressure original value is reached, a second specified time is maintained, a stable value of the flow of the front flow meter is recorded, the flow of the front flow meter is compared with a standard value, if the flow of any one of the front flow meters exceeds the standard value, the air inlet valve is immediately closed, an alarm is given, and manual inspection is performed; if the flow of all the front flow meters does not exceed the standard value, step S3 is performed;

[0023] Step S3: internal leakage test, any two shunt air inlet valves are selected to be closed, which are referred to as A route and B route, and the remaining one is referred to as C route, the front discharge valves of the A route and the B route are opened, a third specified time is maintained, the flow of the C route is monitored, if the flow of the C route exceeds the standard value, the C route shunt air inlet valve is immediately closed, an alarm is given, and manual inspection is performed; if the flow of the C route does not exceed the standard value, the C route shunt air inlet valve is closed, and the front discharge valve of the C route is opened;

[0024] Step S4: return to step S3 to change the selection of the first route, and synchronously complete emptying through the linkage valve, and detect the flow of the A route and the B route;

[0025] Step S5: open the clamp;

[0026] Step S6: remove the measured piece.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] (1) The inflation and deflation processes when the clamp in operation is closed and when the clamp is opened are directly completed by the linkage valve designed in the present application during the action of the clamp, the inflation and deflation time after the action is completed is saved, and the production efficiency is directly improved in continuous production;

[0029] (2) The cut-off point of gas opening and closing is shortened, the original distance is from the sealing surface of the measured piece to the peripheral conventional control valve, including the pipeline therein, after improvement, the cut-off point can be directly designed to the air inlet or air outlet near the measured piece, the peripheral dead volume is reduced, and the influence of the dead volume on the internal dead volume detection of the measured piece is reduced;

[0030] (3) The implementation of the technology also saves the amount of gas source, saves the number of conventional valve switching, reduces maintenance, reduces power consumption, reduces equipment wear and tear, and improves detection sensitivity;

[0031] (4) These measures are beneficial to reducing auxiliary time, reducing cost, reducing failure, and improving production rhythm speed. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the clamp and air supply line of Comparative Example 1;

[0033] Figure 2 is a schematic diagram of the clamp and air supply line of Example 1;

[0034] Figure 3 is a schematic diagram of the clamp and air supply line of Example 2;

[0035] Figure 4 is a schematic diagram of the basic structural relationship of the clamp plate and linkage valve of Example 2;

[0036] Figure 5 is a schematic diagram of the linkage valve structure;

[0037] Figure 6 is a schematic diagram of the component relationship in the fully separated state of the clamp;

[0038] Figure 7 is a schematic diagram of the component relationship in the state of just closing the measured member and not yet applying pressure;

[0039] Figure 8 is a schematic diagram of the component relationship in the state of the valve core not yet opening while applying pressure;

[0040] Figure 9 is a schematic diagram of the component relationship in the fully applied pressure state;

[0041] Figure 10 is a schematic diagram of the structure of the power rod and guide rod with a limiter of Example 3 when they are in axial concentricity.

[0042] The reference signs are as follows:

[0043] 1. first clamp plate; 2. measured piece; 3. second clamp plate; 4. gas source; 5. gas source flow meter; 6. branch inlet valve; 7. branch air pressure gauge; 8. rear discharge valve; 9. branch outlet valve; 10. rear flow meter; 11. second seal; 12. outlet A1; 13. outlet A2; 14. outlet A3; 15. first seal; 16. inlet A1; 17. inlet A2; 18. inlet A3; 19. front discharge valve; 20. front flow meter; 21. linkage valve group; 22. second clamp plate seal plate; 23. linkage valve; 24. second clamp plate transmission plate; 25. guide hole; 26. guide rod outer nut; 27. guide rod; 28. power rod; 29. independent stopper; 30. washer A; 31. main spring; 32. washer B; 33. valve core inner seal; 34. measured piece common passage; 35. clamp plate inlet and outlet passage; 36. valve core; 37. exhaust seal; 38. exhaust seal groove; 39. valve seat; 40. gas connector seal; 41. gas connector; 42. connector inlet and outlet passage; 43. valve core outer seal; 44. valve core outer washer; 45. valve core outer spring; 46. fixed ring washer; 47. valve core outer fixed ring; 48. guide rod self-stop. DETAILED DESCRIPTION

[0044] The application will be described in detail below through specific examples, but the protection scope of the application is not limited. Unless otherwise specified, the experimental methods used in the application are conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0045] Multiple flow meters are used to obtain external leakage data simultaneously, accelerating detection.

[0046] A fuel cell generally has two common passages, and the application can test only one group to test the measured piece 2 as a bipolar plate, as shown in Figure 1 The prior art has two common passages, and each common passage has multiple specific inlet and outlet passages of fluid. The inlet and outlet of each fluid correspond to each other. The application uses only one common passage, which can be used as an inlet or an outlet, and single gas enters the passage.

[0047] The structure and function of the linkage valve 23 will be described first, as shown in Figures 4 to 10 , wherein Figure 4 is a general overview, Figures 5 to 9 is a description of the structure details and the relationship between the components in the action. Figure 10 is a structural change process.

[0048] The key components of the application are a group of components that have linkage, complete the sequence of gas input opening and ventilation in clamp plate closing, the sequence of gas input closing, gas emptying, and complete opening function in opening.

[0049] In the case that all valves are normally closed and the gas source pressure has been set, the special valve assembly of the gas control device designed by the present application takes the linkage valve 23 as the name in the present application.

[0050] The clamp has opposite first and second clamping plates 1 and 3, and the measured member 2 is placed between the two during detection.

[0051] At least one clamping plate in the clamp of the present application has a composite structure of the linkage valve 23, and the above second clamping plate 3 has the linkage valve 23 and the related matching structure as an example. The number of required public channels 34 of the measured member is denoted as n1.

[0052] The second clamping plate transmission plate 24 and the second clamping plate sealing plate 22 are connected by a plurality of guide rods 27, one end of the guide rod 27 is fixed on the second clamping plate sealing plate 22, and the other end is inserted into the guide hole 25 and can slide in the guide hole 25. Above the second clamping plate transmission plate 24, the guide rod 27 has a guide rod outer nut 26, which is used to limit the maximum distance L2 between the second clamping plate transmission plate 24 and the second clamping plate sealing plate 22 when they are separated.

[0053] The second clamping plate transmission plate 24 and the second clamping plate sealing plate 22 have an independent stopper 29 therebetween, which is used to limit the distance between the second clamping plate transmission plate 24 and the second clamping plate sealing plate 22. The maximum distance between the second clamping plate transmission plate 24 and the second clamping plate sealing plate 22 is denoted as L3, and L3=L2.

[0054] Of course, the independent stopper 29 can also limit the minimum distance between the second clamping plate sealing plate 22 and the second clamping plate transmission plate 24, thereby limiting the maximum pressure that the valve core outer spring 45 and the main spring 31 can withstand. The guide rod 27 is sleeved with a concentric main spring 31, which is compressed between the second clamping plate transmission plate 24 and the second clamping plate sealing plate 22, and has a washer A 30 and a washer B 32. The elastic force of the main spring 31 is denoted as F2, and F2<F1.

[0055] The upper and lower limits of the movement of the guide rod 27 in the guide hole 25 are limited by L2, which has the same value as L3. The second clamping plate transmission plate 24 reserves an up-down sliding space for the guide rod 27, and the length of the space is L4, L4>L2, that is, L4>L3.

[0056] The second clamping plate transmission plate 24 has a plurality of linkage valves 23 corresponding to a plurality of gas inlets and outlets of the measured member 2. The linkage valve 23 is composed of a valve seat 39, a valve core 36, a valve core inner sealing ring 33, a valve core outer sealing ring 43, a valve core outer washer 44, a valve core outer spring 45, a gas connection pipe 41, a gas connection pipe sealing ring 40, a fixed ring washer 46, and a valve core outer fixed ring 47.

[0057] Among them, the outer fixing ring 47 of the valve core is fixed in the threaded hole of the second clamping plate transfer plate 24 by using the threads on its surface. Concentric with the axis of this hole, a valve core 36 is connected from the second clamping plate transfer plate 24 towards the second clamping plate sealing plate 22. A fixing ring washer 46, an outer spring 45 of the valve core, an outer washer 44 of the valve core, an outer sealing ring 43 of the valve core, and a valve seat 39 are successively connected in series on the valve core 36. The part of the valve core 36 inside the valve seat 39 has an annular stepped valve head, and the annular step forms a supporting contact surface with the stepped surface where the inner hole of the valve seat 39 contracts. An inner sealing ring 33 of the valve core is sleeved outside the annular step. There is an active gap between the valve seat 39 and the second clamping plate sealing plate 22, and there is a sealing surface between the valve seat 39 and the second clamping plate sealing plate 22. At the position corresponding to this sealing surface on the second clamping plate sealing plate 22, there is an exhaust sealing ring 37, and the exhaust sealing ring 37 is placed in the exhaust sealing groove 38 on the second clamping plate sealing plate 22. The valve seat 39 has a lateral third hole and is connected with an air intake pipe 41 in a threaded manner. There is an air intake pipe sealing ring 40 between the air intake pipe 41 and the valve seat 39, and this air intake pipe 41 is connected with the above-mentioned front flowmeter 20 through a pipeline.

[0058] The distance between the sealing surfaces of the valve core 36 and the valve seat 39 is L1. When the inner sealing ring 33 of the valve core seals the gas on this contact surface when forming the contact surface, the air intake and exhaust between the air intake pipe 41 and the measured part 2 are disconnected. Each valve seat 39 corresponds to a clamping plate air intake and exhaust channel 35. The elastic force of the outer spring 45 of the valve core, that is, the power rod 28 is fixedly connected to the second clamping plate transfer plate 24, and its closing force is denoted as F1. There are multiple guiding rods 27 in a set of devices, denoted as n2, and it is set that n2*F1 < F2. The pressure formed by the outer spring 45 of the valve core on the sealing surface is greater than the pressure F3 formed by the air source, preferably exceeding 0.5 - 1.0 times F3, and not less than the total net pressure required for the overall sealing by the specific seals.

[0059] During the specific test process, the power rod 28 drives the second clamping plate transfer plate 24, and when the clamp is closed, pressure is applied and the displacement of the components changes.

[0060] Comparative example

[0061] As Figure 1 shown, in the prior art, each channel to be measured has two groups of pipelines for air intake and exhaust. When the clamp is closed, external leakage occurs, that is, the leakage through the outside of the measured part 2, and the gas leakage rate through the seal is specifically measured. The pressure of the air source 4 is fixed. One group of the branch air intake valves 6 is fully open, and the air source flowmeter 5 records the overall external leakage amount. The remaining branch air intake valves 6 remain closed if not opened, and the same applies hereinafter. Only one branch air intake valve 6 is opened, and the branch air exhaust valves 9 of the other two paths are opened, and the leakage amount from the cavity connected by the opened branch air intake valve 6 to other cavities is measured, that is, the internal leakage flow rate. As shown in the figure, there are 3 cavities, so it is divided into 3 times, that is, 3 kinds of internal leakage flow rates. <Example 1

[0063] like Figure 2 As shown, each test channel has a set of pipelines. When the clamp is closed, there is external leakage, that is, leakage through the test piece 2. The measurement is specifically of the gas leakage rate through the seal. The gas source 4 pressure is fixed, one set of branch inlet valves 6 is fully open, and one set of front flow meters 20 records the external leakage of each channel. With only one branch inlet valve 6 open, the other two front exhaust valves 19 are opened, and one set of front flow meters 20 measures the gas flow rate. The flow rate measured for the two channels where the branch inlet valves are not open is the leakage from the chamber with the branch inlet valve 6 open to other chambers. As shown, there are 3 chambers, so the leakage is measured 3 times, i.e., 3 types of internal leakage flow rates.

[0064] Example 2

[0065] like Figure 3 As shown, each channel to be tested has a set of pipelines and a linkage valve 23. Since the linkage valve 23 automatically opens when the clamp is closed and automatically closes when the clamp is open, the opening and closing time of the branch air inlet valve 6 can be selectively arranged during the movement of the clamp opening and closing, without occupying the time during the closing, thereby saving auxiliary testing time.

[0066] from Figure 6 Fully open to Figure 9 The complete closure of the circulatory system can be divided into the following four stages:

[0067] The first phase is not fully activated, such as... Figure 6 As shown:

[0068] Under the weight of the second clamping plate sealing plate 22 and the action of the main spring 31, the second clamping plate sealing plate 22 and the second clamping plate transfer plate 24, which make up the second clamping plate 3 of the fixture, are completely separated. The guide rod outer nut 26 is locked on the second clamping plate transfer plate 24, limiting the maximum distance between the two plates. The valve core 36 is fixed by the valve core outer fixing ring 47, which is threaded onto the second clamping plate transfer plate 24. The linkage valve 23 is suspended on the second clamping plate transfer plate 24 through the valve core 36. The elastic force of the valve core outer spring 45 and the other weight of the linkage valve 23 act on the support surface of the valve core 36 and the valve core inner sealing ring 33 to form a seal. In this state, the test piece 2 can be installed.

[0069] At this time, spring 45 maintains a sealing force, the common channel 34 of the tested part and the air inlet and outlet 35 of the clamp are pressureless, L4 and L3 have maximum values, and L1 and L2 are 0.

[0070] The second stage is the state where the circuit is just closed but no pressure has been applied, such as... Figure 7 As shown:

[0071] After the test piece 2 is placed, when the second clamping plate 3 moves downward to the surface of the test piece 2 under the control of the power rod 28, the force relationship between the other components of the second clamping plate sealing plate 22 and the test piece 2 is as follows: Figure 5 The same as the fully open state.

[0072] At this time, the test piece 2 just comes into contact with the second clamping plate sealing plate 22, the second clamping plate sealing plate 22 has not yet applied pressure to the test piece 2, the linkage valve 23 has not come into contact with the exhaust sealing groove 38, L4 and L3 have maximum values, and L4>L3, while L1 and L2 are 0.

[0073] The third stage is when valve core 36 is not yet open during the pressure application process, such as... Figure 8 As shown:

[0074] The power rod 28 moves downward, applying pressure to the second clamping plate sealing plate 22 through the main spring 31 and the valve core outer spring 45, and forming a seal between the tested part 2 and the second clamping plate sealing plate 3 through the second sealing element 11, and forming a seal between the first clamping plate 1 and the tested part 2 through the first sealing element 15. The exhaust sealing ring 37 is in a closed sealing state.

[0075] At this time, the test piece 2 just comes into contact with the second clamping plate sealing plate 22. During the process of the second clamping plate sealing plate 22 applying pressure to the test piece 2, the linkage valve 23 just comes into contact with the exhaust sealing groove 38. The valve core inner sealing ring 33 is still in a sealed state. The values ​​of L4 and L3 decrease synchronously and are represented by L4' and L3'. L2 starts to increase from 0. In the actual state, L2' = L4 - L4' = L3 - L3', and L1 is 0.

[0076] The fourth stage involves opening valve core 36 to achieve full pressure, such as... Figure 9 As shown:

[0077] The closing pressure is applied by the power rod 28. This pressure is the closing force for testing. The exhaust sealing ring 37 continues to close and seal, the outer spring 45 of the valve core is compressed, and the inner sealing ring 33 of the valve core leaves the sealing surface. The air source or exhaust is connected to the air inlet and outlet of the test piece 2 through the air inlet pipe 41. The air inlet or outlet of a specific channel is determined by the opening or closing of the branch air inlet valve 6 and the front exhaust valve 19 during use.

[0078] During the transition from complete closure to complete opening, the dynamic process of opening does not include the complete closure phase. Figure 9 The process, in contrast to the closure process described above, includes:

[0079] (1) As Figure 8 As shown, during the pressure reduction process, valve core 36 is not yet fully closed.

[0080] (2) Figure 7As shown, the power rod 28 rises, the independent limiter 29 disengages from the second clamping plate transmission plate 24, and each main spring 31 maintains the sealing force, which is greater than the pressure formed by the air source pressure on the contact surface of the test piece 2. The valve core 36 lifts the linkage valve 23, and the valve core inner sealing ring 33 closes the valve inner sealing surface of the linkage valve 23, disconnecting the inlet and outlet air passages 42. The power rod 28 rises, the exhaust sealing ring 37 contacts and seals, and the pressurized gas inside the test piece is discharged through this sealing surface. The power rod 28 continues to rise until the second clamping plate transmission plate 24 contacts the guide rod outer nut 26, driving the entire second clamping plate 3 to rise and move away from the test piece 2.

[0081] (3) Figure 6 As shown, in the fully open state, the power rod 28 drives the second clamping plate 3 to rise to the set maximum position, removes the test piece 2, and then distributes the test piece 2 to the designated destination according to whether it is qualified.

[0082] The gas management for the detection operation can be divided into an inlet section and an outlet section. The inlet and outlet sections can be located on the first clamp 1 or the second clamp 3 of the fixture, or on different clamps. All valves are normally closed, and the gas source pressure is set, such as 70 kPag, for cavity leak detection.

[0083] according to Figure 2 The first clamp 3 has or uses an intake section and an exhaust section. According to Figure 3 The first clamp 3 has or can use an intake section to complete the functions of an intake section and an exhaust section.

[0084] Example 3

[0085] See Figure 10 The structure when the power rod 28 and the guide rod 27 are axially concentric.

[0086] In embodiments 1-2, the power rod 28 and the guide rod 27 are not concentric. In this embodiment, the power rod 28, the guide rod 27, and the guide rod with its own limiter 48 are located in a concentric position, reducing the layout space on each plate plane and making the device structure more compact.

[0087] The independent limiter 29 is replaced by the guide rod 27 with its own limiter 48, which is embedded in the second clamping plate 24. The power rod 28 is hollow and placed concentrically around the guide rod 27, leaving space for the guide rod 27.

[0088] The guide rod 27 passes through the guide hole 25 of the second clamp transmission plate 24, the upper part of the second clamp transmission plate 24 is connected with the guide rod outer nut 26 through screw connection, the guide rod outer nut 26 is connected with the second clamp transmission plate 24 through screw connection and has a hollow structure for accommodating the guide rod 27 and the guide rod outer nut 26; the lower part of the second clamp transmission plate 24 is connected with the second clamp sealing plate 22 through screw connection, the second clamp sealing plate 22 and the second clamp transmission plate 24 are sequentially connected with the gasket B 32, the main spring 31 and the gasket A 30, the guide rod 27 above the gasket A 30 has a ring-shaped guide rod self-limiter 48 with increased diameter, the guide rod self-limiter 48 defines the minimum distance between the second clamp sealing plate 22 and the second clamp transmission plate 24, thereby limiting the maximum pressure of the valve core outer spring 45 and the main spring 31.

[0089] Example 4

[0090] The following through comparative example and example, to compare the different scheme in the detection of auxiliary time, explain how to realize the time saving of the present application. Auxiliary time refers to the time of opening the clamp, putting the measured piece 2, closing the clamp, opening and closing various valves and pausing, and fluid pressure stabilizing time in a cycle of continuous detection in addition to the specific detection of leakage.

[0091] The following comparative example 1 and example 1, example 2, the measured piece 2 is taken as an example of multiple same single cells, for example, 10 pieces are used, to facilitate comparison and explanation. According to the specific single cell, the design structure of the polar plate or the membrane electrode, the sealing member of the measured object may be fixed thereon or on the clamp, but does not affect the essence of the present application.

[0092] Leak detection of a single membrane electrode, wherein the flow field on the clamp is not shown.

[0093] Leak detection of a single membrane electrode, wherein the flow field on the clamp is not shown.

[0094] The overall flow structure is shown in Figure 1 .

[0095] Leak detection steps:

[0096] (1) The clamp is in an open state, and the measured piece 2 is put in, which takes 1s;

[0097] (2) The clamp is closed, which takes 1s;

[0098] (3) External leakage test

[0099] (3.1) Open all shunt inlet valves 6, which takes 1s, lasts for a first specified time, which takes 1s, and reaches the specified inlet pressure original value;

[0100] (3.2) Close all shunt inlet valves 6, set time required to 1 s, continue for a second specified time, non- auxiliary time, record the air pressure value of the flow field pressure gauge;

[0101] (3.3) Compare the flow field pressure value with the original value of the inlet air pressure;

[0102] (3.3.1) If any flow field pressure difference exceeds the specified value, it is an external leakage exceeding the standard, an alarm is given, and manual inspection is carried out;

[0103] (3.3.2) If the pressure difference does not exceed the standard, proceed to the next step;

[0104] (4) Open all back vent valves 8, set time required to 1 s, vent, set time required to 1 s, generally damage the back flow meter 10 without using the back vent valve 8 but directly using the shunt outlet valve 8;

[0105] (5) Close all back vent valves 8, set time required to 1 s.

[0106] Steps (1) to (5) are completed, and the total auxiliary time required is 8 s.

[0107] (6) Select to open two shunt outlet valves 9, set time required to 1 s;

[0108] (7) At the same time as step (6), open the opposite shunt inlet valve 6, without cumulative time;

[0109] (8) Continue for a third specified time, non- auxiliary time, monitor the first air pressure, detect the second and third flow rates, and the two values are the internal leakage air volume of the first to the remaining second and third;

[0110] (9) Close the first shunt inlet valve 6, set time required to 1 s;

[0111] (10) Open all back vent valves 8, set time required to 1 s, vent, set time required to 1 s;

[0112] (11) Close all back vent valves 8, set time required to 1 s;

[0113] Steps (6) to (11) are completed for single path detection, and the total auxiliary time is 5 s.

[0114] (12) Change the selection of the first path;

[0115] Repeat steps (6) to (11) to obtain other relative leakage values, including the initial and repeated, a total of 3 paths for 3 times, and the detection is completed; the total auxiliary time for 3 paths is 15 s;

[0116] (13) Open the clamp, set time required to 1 s;

[0117] (14) remove the measured piece 2, the required time is set to 1s;

[0118] Step (1) to (14) complete a detection of the detection of the auxiliary time for 8+15+2=25s.

[0119] (15) return to step (1) to start a new detection.

[0120] II, leak detection example of example 1

[0121] The overall flow structure is shown in Figure 2 , using the gas circuit of the application.

[0122] Leak detection steps:

[0123] (1) the clamp is in the open state, put in the measured piece 2, the required time is set to 1s;

[0124] (2) clamp closed, the required time is set to 1s;

[0125] (3) external leakage test

[0126] (3.1) open all shunt inlet valve 6, the required time is set to 1s, for the first specified time, the required time is set to 1s, to reach the specified inlet pressure original value;

[0127] (3.2) for the second specified time, non auxiliary time, record the flow of the front flowmeter 20 stable value;

[0128] (3.3) the flow of the front flowmeter 20 is compared with the standard value;

[0129] (3.3.1) any one of the front flowmeter 20 flow exceeds the standard value for external leakage, immediately close the shunt inlet valve 6, at the same time alarm, manual inspection;

[0130] (3.3.2) all flow does not exceed the standard value then follow-up;

[0131] Step (1) to (3) complete and qualified, the auxiliary time is 4s.

[0132] (4) internal leakage test

[0133] (4.1) select to close two shunt inlet valve 6, set to 1s, called A and B, the remaining one called C;

[0134] (4.2) in step (4.1) at the same time, open A and B pipeline outlet valve, not included in the auxiliary time;

[0135] (4.3) for the third specified time, non auxiliary time, monitor the flow of C;

[0136] (4.3.1) C flow minus the flow stable value of the flow meter 20, data exceeds the standard value, unqualified, immediately close the C road inlet valve, and alarm, manual inspection;

[0137] (4.3.2) C flow minus the flow stable value of the flow meter 20, data does not exceed the standard value, qualified, enter step (7);

[0138] (4.4) Close the C road inlet valve, the required time is set to 1s;

[0139] (4.5) At the same time as step (4.4), open the C road emptying valve, not included in the auxiliary time; Single road detection total auxiliary time 2s;

[0140] (4.6) Return to step (4) to change the selection of the first road; Repeat steps (4.1) to (4.6) to obtain other relative leakage values; 3 times for 3 roads, complete the detection, 6s for 3 roads;

[0141] (5) Open the clamp, the required time is set to 1s;

[0142] (6) Remove the measured piece 2, the required time is set to 1s;

[0143] The total auxiliary time for one detection piece of steps (1) to (6) is 4+6+2=12s.

[0144] (7) Return to step (1) to start a new detection;

[0145] Example 1 saves 13s of time compared to the relative example, the ratio is (25-12) / 25=52%.

[0146] Three, leak detection example of example 2

[0147] The overall flow structure is shown in Figure 3 .

[0148] Leak detection steps:

[0149] (1) The clamp is in the open state, put in the measured piece 2, set to 1s;

[0150] (2) External leakage test

[0151] (2.1) At the same time as step (1), open all branch inlet valves 6, since the original is in the open state, not included in the auxiliary time, due to the action of the linkage valve group 21, no leakage occurs here, saving time;

[0152] (2.2) Clamp closed, set to 1s, continue for the first specified time, set to 1s, reach the specified inlet pressure original value;

[0153] (2.3) for a second specified time, non-aided time, record the stable value of the flow of the front flow meter 20;

[0154] (2.4) compare the flow of the front flow meter 20 with the standard value, not counting time;

[0155] (2.4.1) if any flow field flow exceeds the standard value, it is an external leakage exceeding the standard, immediately close the bypass air inlet valve 6, and at the same time alarm, manual inspection;

[0156] (2.4.2) if all flows do not exceed the standard value, proceed to the next step;

[0157] When steps (1) to (2) are completed and qualified, the auxiliary time is 3s in total;

[0158] (3) internal leakage detection

[0159] (3.1) select to close two bypass air inlet valves 6, set to 1s, called A and B, and the remaining one is called C;

[0160] (3.2) at the same time as step (3.1), open the front discharge valve 19 of A and B pipelines, not counting into the auxiliary time;

[0161] (3.3) continue for a third specified time, non-aided time, monitor the flow of C;

[0162] (3.3.1) C flow minus the stable value of the flow of the front flow meter 20, if the data exceeds the standard value, it is unqualified, immediately close the C air inlet valve, open the exhaust valve, open the clamp, and the detected object is sorted into unqualified products;

[0163] (3.3.2) C flow minus the stable value of the flow of the front flow meter 20, if the data does not exceed the standard value, it is qualified, proceed to the next step;

[0164] (3.4) close the C bypass air inlet valve 6, set to 1s;

[0165] (3.5) at the same time as step (3.4), open the C front discharge valve 19, not counting into the auxiliary time;

[0166] The total auxiliary time for single path detection is 2s;

[0167] (3.6) return to step (4) to change the selection of the first path; repeat steps (4.1) to (4.6) to obtain other relative leakage values; a total of 3 times for 3 paths, complete step (3) to end this detection, wherein the third time the emptying function is opened simultaneously with the opening of the clamp by the linkage valve 23, and is not counted separately into the auxiliary time, 3 paths in total 4s.

[0168] (4) open the clamp, set to 1s;

[0169] (5) remove the measured piece 2, set to 1s;

[0170] The detection time of one piece in steps (1) to (5) is 3+6+2=11s.

[0171] (6) return to step (1) to start a new one-time detection.

[0172] Compared with the above time, the linkage valve group 21 designed by the application further saves the time occupied by the clamp in action.

[0173] Example 2 saves 1s compared with Example 1, the ratio is (12-11) / 12=8.3%,

[0174] Example 2 saves 14s compared with Comparative Example 1, the ratio is (25-11) / 25=56%,

[0175] The above only describes the preferred embodiments of the application, and does not represent the limitation of the application. Any modification, equivalent replacement and improvement made by those skilled in the art within the scope and principles disclosed by the application should be covered by the protection scope of the application.

Claims

1. A clamp and gas supply line system with a gas valve structure that shortens the auxiliary time for leak detection, a first clamp plate (1) embedded with a first seal (15), a second clamp plate (3) embedded with a second seal (11), and a gas source (4) entering each branch pipe of a set of common passages of the second clamp plate (3) respectively in turn provided with a branch gas inlet valve (6) and a branch gas pressure gauge (7), characterized in that, The front discharge valve (19) and the front flow meter (20) are arranged after the shunt gas pressure gauge (7) on each branch pipeline of the second clamp plate (3) into which the gas source (4) enters, the gas source flow meter (5) arranged on the main pipeline of the second clamp plate (3) into which the gas source (4) enters is omitted, and a set of common channels with the rear discharge valve (8), the shunt gas discharge valve (9) and the rear flow meter (10) connected with the second clamp plate (3) is omitted, wherein the common channels refer to the fluid distribution pipeline between the measured piece (2) and the second clamp plate (3), and the measured piece (2) includes a single pole plate, a double pole plate, a single cell and a short stack; The front flow meter (20) is arranged after the shunt gas pressure gauge (7) on each branch pipeline of the second clamp plate (3) into which the gas source (4) enters, the gas source flow meter (5) arranged on the main pipeline of the second clamp plate (3) into which the gas source (4) enters is omitted, and a set of common channels with the rear discharge valve (8), the shunt gas discharge valve (9) and the rear flow meter (10) connected with the second clamp plate (3) is omitted, wherein the common channels refer to the fluid distribution pipeline between the measured piece (2) and the second clamp plate (3), and the measured piece (2) includes a single pole plate, a double pole plate, a single cell and a short stack; The front flow meter (20) is arranged after the shunt gas pressure gauge (7) on each branch pipeline of the second clamp plate (3) into which the gas source (4) enters, the gas source flow meter (5) arranged on the main pipeline of the second clamp plate (3) into which the gas source (4) enters is omitted, and a set of common channels with the rear discharge valve (8), the shunt gas discharge valve (9) and the rear flow meter (10) connected with the second clamp plate (3) is omitted, wherein the common channels refer to the fluid distribution pipeline between the measured piece (2) and the second clamp plate (3), and the measured piece (2) includes a single pole plate, a double pole plate, a single cell and a short stack; The front flow meter (20) is arranged after the shunt gas pressure gauge (7) on each branch pipeline of the second clamp plate (3) into which the gas source (4) enters, the gas source flow meter (5) arranged on the main pipeline of the second clamp plate (3) into which the gas source (4) enters is omitted, and a set of common channels with the rear discharge valve (8), the shunt gas discharge valve (9) and the rear flow meter (10) connected with the second clamp plate (3) is omitted, wherein the common channels refer to the fluid distribution pipeline between the measured piece (2) and the second clamp plate (3), and the measured piece (2) includes a single pole plate, a double pole plate, a single cell and a short stack; 2. A clamp and air supply line system with a shortened leak hunting assist time for a gas valve structure as defined in claim 1, characterized in that The outer fixed ring (47) of the valve core of the linkage valve (23) is fixed by the surface thread in the threaded hole of the second clamping plate transmission plate (24), and the valve core (36) is connected from the second clamping plate transmission plate (24) to the second clamping plate sealing plate (22) with the hole axis as the concentric axis, and the valve core (36) is sequentially connected with the fixed ring gasket (46), the outer spring of the valve core (45), the outer gasket of the valve core (44), the outer sealing ring of the valve core (43) and the valve seat (39) in sequence, and the part of the valve core (36) in the valve seat (39) has a ring-shaped step valve head, the ring-shaped step forms a supporting contact surface with the step surface of the inner hole of the valve seat (39), the ring-shaped step is sleeved with the inner sealing ring of the valve core (33), the valve seat (39) and the second clamping plate sealing plate (22) have a sealing surface, the second clamping plate sealing plate (22) has an exhaust sealing ring (37) corresponding to the position of the sealing surface, the exhaust sealing ring (37) is placed in the exhaust sealing groove (38) on the second clamping plate sealing plate (22), and the valve seat (39) has a lateral third hole to be connected with the gas connection pipe (41) in a threaded manner, and the gas connection pipe (41) and the valve seat (39) have a gas connection pipe sealing ring (40) therebetween, and the gas connection pipe (41) is connected with the front flow meter (20) through a pipeline.

3. A method of reducing leak test assistance time, characterized by, The clamp and gas supply line system of the gas valve structure of claim 1 or 2 comprises the following steps: Step S1: the clamp is in an open state, and the measured piece (2) is placed between the first clamping plate (1) and the second clamping plate (3); Step S2: the clamp is closed; Step S3: outer leakage test, open all branch air inlet valves (6), continue for a first specified time, reach a specified air inlet pressure original value, continue for a second specified time, record the stable flow value of the front flow meter (20), and compare the flow of the front flow meter (20) with a standard value; if the flow value of any one front flow meter (20) exceeds the standard value, it is an outer leakage exceeding standard, the branch air inlet valve (6) is immediately closed, an alarm is sounded at the same time, and manual inspection is performed; if the flow of all front flow meters (20) does not exceed the standard value, the next step is performed; Step S4: inner leakage detection, select to close any two branch air inlet valves (6), which are referred to as A route and B route, and the remaining one is referred to as C route, simultaneously open the front exhaust valves (19) of the A route and the B route, continue for a third specified time, monitor the flow of the C route, and if the flow of the C route minus the stable flow value of the front flow meter (20) in step S3 exceeds the standard value, it is unqualified, the C route branch air inlet valve (6) is immediately closed, an alarm is sounded at the same time, and manual inspection is performed; if the flow of the C route minus the stable flow value of the front flow meter (20) in step S3 does not exceed the standard value, it is qualified, the C route branch air inlet valve (6) is closed, and the front exhaust valve (19) of the C route is opened at the same time; Step S5: return to step S4 to change the selection of the first route, and detect the flow of the A route and the B route respectively; Step S6: open the clamp; Step S7: remove the measured piece (2).

4. A method of reducing leak test assistance time, characterized by, The clamp and gas supply line system of the gas valve structure of claim 1 or 2 comprises the following steps: Step S1: the clamp is in an open state, and the measured piece (2) is placed between the first clamping plate (1) and the second clamping plate (3); Step S2: leakage test, while step S1, open all shunt intake valve (6), clamp closed, lasting first specified time, to achieve the specified intake pressure original value, lasting second specified time, record the flow of the front flowmeter (20) stable value, the flow of the front flowmeter (20) compared with the standard value, any one of the flow of the front flowmeter (20) exceeds the standard value for leakage, immediately close the intake valve, at the same time alarm, manual inspection; all the flow of the front flowmeter (20) are not more than the standard value then proceed to step S3; Step S3: internal leakage test, select to close any two-way shunt intake valve (6), called A and B road, the remaining one called C road, while opening A and B road front exhaust valve (19), lasting third specified time, monitor C road flow, C road flow minus the flow of the front flowmeter (20) in step S2 stable value, exceeds the standard value is unqualified, immediately close C road shunt intake valve (6), at the same time alarm, manual inspection; C road flow minus the flow of the front flowmeter (20) in step S2 stable value, does not exceed the standard value is qualified, close the C road shunt intake valve (6), while opening the C road front exhaust valve (19); Step S4: return to step S3 change the first road selection, through the linkage valve (23) synchronous completion of emptying, detect A and B road flow; Step S5: open the clamp; Step S6: remove the measured piece (2).

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