Polar plate airtightness detection tool

Abstract

The utility model discloses a polar plate airtightness detection tool which comprises a limiting groove, the inner wall contour of the limiting groove is the same as the outer contour of a polar plate, and the limiting groove is used for installing the polar plate. An air inlet and an air outlet are formed in the limiting groove, a plurality of detection cavities are further formed in the side wall of the limiting groove, and the multiple detection cavities are arranged in the circumferential direction of the limiting groove; the detection unit comprises an air pressure detection device and pressure sensors arranged in the detection cavities, and the pressure sensors and the detection cavities are arranged in a one-to-one correspondence mode; and the control unit is connected with the sealing and fixing structure, the detection unit and the workbench. Through the arrangement of the detection cavities and the pressure sensor, which detection cavity corresponds to the pole plate position has leakage can be judged, so that the leakage position can be conveniently determined, detection errors caused by the fact that the air leakage point of the pole plate is relatively small and the air pressure detection device at the air outlet is difficult to detect tiny pressure change can be avoided, and the monitoring accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and particularly relates to a plate airtightness detection tooling. Background Art

[0002] During the operation of a fuel cell stack, it is necessary to prevent coolant, hydrogen, and oxygen from passing through the plate and entering the opposite flow channel, thereby affecting the normal operation of the battery. Therefore, it is necessary to detect the airtightness of the base material of the plate before the plate leaves the factory or is put into use. The industry also has requirements for the airtightness of the plate: helium leakage rate < 2×10 -6 ml / (s·cm 2 ). There are many devices in the industry for detecting the airtightness of plates. Some of them can only judge whether the plate leaks air and cannot accurately detect the leakage position. Moreover, the existing airtightness detection devices for plates in the prior art also have defects such as low detection efficiency, inconvenient operation, and inability to quickly complete the detection of bipolar plates.

[0003] In addition, most of the existing plate airtightness detection devices usually need to use sealing structures such as upper and lower sealing plates to clamp the plate during the detection process to form a plate chamber for airtightness detection. When the pressure between the upper and lower sealing plates is insufficient, it will be difficult to meet the requirements for bipolar plate airtightness detection; when the pressure between the upper and lower sealing plates is too high, the plate will be damaged.

[0004] It can be seen that there are still certain defects in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to provide a plate airtightness detection tooling to solve the problems of low detection accuracy of the existing plate airtightness detection device and the risk of plate damage caused by excessive pressure when the existing plate airtightness detection device is used.

[0006] To achieve the above purpose, the utility model provides a plate airtightness detection tooling, including:

[0007] A sealing and fixing structure, including a limiting groove. The inner wall contour of the limiting groove is the same as the outer contour of the plate. The limiting groove is used for installing the plate; an air inlet and an air outlet are arranged inside the limiting groove, and a plurality of detection cavities are further arranged on the side wall of the limiting groove. The plurality of detection cavities are arranged circumferentially around the limiting groove;

[0008] A detection unit, including a pressure detection device connected to the air outlet and a pressure sensor arranged inside the detection cavity. The pressure sensors are arranged in one-to-one correspondence with the detection cavities;

[0009] A workbench for carrying the sealing and fixing structure;

[0010] A control unit, which is respectively connected to the sealing and fixing structure, the detection unit and the workbench.

[0011] As a preferred embodiment of the present application, the sealing and fixing structure further includes a sealing plate and a first driving member, the first driving member is connected to the sealing plate, and the sealing plate can move relative to the limiting groove in the vertical direction under the drive of the first driving member to seal or open the limiting groove.

[0012] As a preferred embodiment of the present application, the workbench includes a base and a pressure-limiting bearing part, and the limiting groove is arranged on the upper part of the pressure-limiting bearing part.

[0013] As a preferred embodiment of the present application, the pressure-limiting bearing part has a first state of being fixed relative to the base in the vertical direction and a second state of being able to move relative to the base in the vertical direction; in the second state, the pressure-limiting bearing part can drive the limiting groove to move relative to the base in the vertical direction.

[0014] As a preferred embodiment of the present application, an installation groove is arranged in the middle of the base, at least a part of the pressure-limiting bearing part is arranged in the installation groove, an adjustable limiting device is arranged inside the installation groove, and the adjustable limiting device can be in limit cooperation with the pressure-limiting bearing part to make the pressure-limiting bearing part in the first state, or the adjustable limiting device releases the pressure-limiting bearing part so that the pressure-limiting bearing part is in the second state.

[0015] As a preferred embodiment of the present application, it further includes a load sensor, the load sensor is respectively connected to the adjustable limiting device and the control unit, the load sensor can detect the load borne by the adjustable limiting device and output a corresponding load signal to the control unit, and the control unit can control the adjustable limiting device to be in limit cooperation with or separated from the pressure-limiting bearing part according to the load signal.

[0016] As a preferred embodiment of the present application, the detection unit further includes an information component, and the information component includes a leakage warning member and a leakage area indicating member.

[0017] As a preferred embodiment of the present application, a plurality of the leakage area indicating members are provided, and the plurality of leakage area indicating members are arranged in one-to-one correspondence with the detection cavities.

[0018] Due to the adoption of the above technical solutions, the beneficial effects obtained by the present application are as follows:

[0019] 1. Through the setting of the control unit, the plate airtight detection tooling in the present application can realize automatic detection, greatly reducing the detection difficulty and improving the detection efficiency;

[0020] 2. In the above solution, by comparing the gas pressures at the air inlet and the air outlet through the air pressure detection device, it can be determined whether the airtightness of the electrode plate is good or there is a leakage; by setting the detection chamber and the pressure sensor, it can be determined which electrode plate position corresponding to the detection chamber has a leakage, thus facilitating the determination of the leakage position; and by setting the pressure sensor, it is convenient to detect the relatively subtle pressure changes around the electrode plate, thereby avoiding the detection error caused by the difficulty of the air pressure detection device at the air outlet to detect subtle pressure changes due to the small air leakage point of the electrode plate, which is beneficial to improving the monitoring accuracy.

[0021] 3. In the above solution, through the load sensor, the load borne by the pressure-limiting bearing part can be detected, that is, the load borne by the electrode plate can be detected. When the load borne by the electrode plate is too large, the adjustable limit device releases the pressure-limiting bearing part so that the pressure-limiting bearing part is in the second state, and then the electrode plate can move relative to the base along the vertical direction with the pressure-limiting bearing part to release the pressure of the sealing plate on the electrode plate, avoiding damage to the electrode plate. Description of the Drawings

[0022] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of an electrode plate airtightness detection tooling in an example;

[0024] Figure 2 It is a sectional view of the cooperation structure of the limit groove and the workbench in an example;

[0025] Figure 3 It is a schematic electrical connection diagram of the control unit with the first driving member, the adjustable limit device, the detection unit and the information component.

[0026] List of Components and Reference Numerals:

[0027] 11 Sealing plate, 12 Limit groove, 121 Air inlet, 122 Air outlet, 123 Detection chamber;

[0028] 21 Bracket, 22 First driving member, 23 Guide post;

[0029] 3 Workbench, 31 Base, 311 Installation groove, 32 Pressure-limiting bearing part;

[0030] 4 Adjustable limit device;

[0031] 5 Control unit;

[0032] 61 air pressure detection device, 62 pressure sensor, 63 load sensor, 64 leakage warning member, 65 leakage area indicating member. Detailed implementation mode

[0033] In order to more clearly explain the overall concept of the present invention, the following will be described in detail by way of example in combination with the accompanying drawings of the specification.

[0034] It should be noted that many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific implementation modes disclosed below.

[0035] As Figures 1-3 shown, the present application provides a plate airtightness detection tooling, including a workbench 3 and a sealing and fixing structure, a detection unit and a control unit 5 arranged on the workbench 3.

[0036] Furthermore, referring to Figure 1 and Figure 2 shown, the sealing and fixing structure includes a sealing plate 11, a limiting groove 12, a bracket 21 and a first driving member 22. The inner wall contour of the limiting groove 12 is the same as the outer contour of the plate, and the limiting groove 12 is used for installing the plate; an air inlet 121 and an air outlet 122 are opened inside the limiting groove 12, and a plurality of detection cavities 123 are also arranged on the side wall of the limiting groove 12, and the plurality of detection cavities 123 are arranged around the circumference of the limiting groove 12; the first driving member 22 is respectively connected to the bracket 21 and the sealing plate 11, and the sealing plate 11 can move relative to the limiting groove 12 in the vertical direction under the drive of the first driving member 22 to seal or open the limiting groove 12. Continuing to refer to Figure 2 shown, the detection unit includes an air pressure detection device 61 connected to the air outlet 122 and a pressure sensor 62 arranged inside the detection cavity 123, and the pressure sensor 62 is arranged in one-to-one correspondence with the detection cavity 123; the control unit 5 is respectively connected to the sealing and fixing structure, the detection unit and the workbench 3.

[0037] In the above solution, the air inlet 121 is communicated with the air inlet end of the plate electrode, and the air outlet 122 is communicated with the air outlet end of the plate electrode. The detection gas, such as helium, is introduced into the interior of the plate electrode through the air inlet 121 and the air inlet end. The air pressure detection device 61 arranged at the air outlet 122 detects the air pressure at the air outlet end to judge whether the air tightness of the plate electrode is good. If it is judged that there is a leak in the plate electrode, the pressure sensor 62 arranged in the detection cavity 123 can further detect the pressure state of the plate electrode area corresponding to each detection cavity 123, so as to facilitate judging the position where the plate electrode leaks. This makes the plate electrode air tightness detection tooling in the present application not only capable of detecting whether the plate electrode leaks air, but also capable of quickly and accurately detecting the position where the plate electrode leaks air, facilitating subsequent repair processing, etc. The detection accuracy is greatly improved compared with the existing plate electrode air tightness detection device; and the detection efficiency can be greatly improved through the setting of the control unit 5.

[0038] As a preferred embodiment of the present application, referring to Figure 1 As shown, the aforementioned bracket 21 has a guide post 23 extending in the vertical direction, and the sealing plate 11 is cooperatively connected with the guide post 23. The setting of the guide post 23 is beneficial to ensuring the stability of the moving path of the sealing plate 11 and ensuring its sealing cooperation with the limiting groove 12. The detection unit in the present application further includes an information component, and the information component includes a leakage warning member 64 and a leakage area indicating member 65, and the leakage area indicating member 65 is arranged in one-to-one correspondence with the detection cavity 123.

[0039] It should be noted here that the type and mechanism of the aforementioned first driving member 22 are not specifically limited in the present application. Preferably, it can adopt a cylinder or a hydraulic cylinder. Of course, it can also adopt other different setting methods.

[0040] Furthermore, referring to Figure 1 and Figure 2 As shown, the workbench 3 includes a base 31 and a pressure-limiting bearing part 32. The aforementioned bracket 21 is arranged on the base 31, and the limiting groove 12 is arranged on the pressure-limiting bearing part 32. The pressure-limiting bearing part 32 has a first state that is fixed relative to the base 31 in the vertical direction and a second state that can move relative to the base 31 in the vertical direction; in the second state, the pressure-limiting bearing part 32 can drive the limiting groove 12 to move relative to the base 31 in the vertical direction. With the above structure, when the sealing plate 11 is pressed down and the load borne by the plate electrode is too large, the pressure-limiting bearing part 32 can transfer from the first state to the second state, so that the plate electrode can move relative to the base 31 in the vertical direction along with the pressure-limiting bearing part 32 to release the pressure of the sealing plate 11 on the plate electrode and avoid damage to the plate electrode.

[0041] As a preferred embodiment of the present application, referring to Figure 2As shown, a mounting groove 311 is provided in the middle of the base 31, at least a part of the pressure-limiting bearing part 32 is provided in the mounting groove 311, and an adjustable limit device 4 is provided inside the mounting groove 311. The adjustable limit device 4 can cooperate with the pressure-limiting bearing part 32 to make the pressure-limiting bearing part 32 in a first state, or the adjustable limit device 4 is separated from the pressure-limiting bearing part 32 to make the pressure-limiting bearing part 32 in a second state; the adjustable limit device 4 is also connected to a load sensor 63, which can detect the load borne by the adjustable limit device 4 and output a corresponding load signal to the control unit 5, and the control unit 5 can control the adjustable limit device 4 to cooperate with the pressure-limiting bearing part 32 in a limiting manner or to be separated from the pressure-limiting bearing part 32 according to the load signal.

[0042] The present application does not specifically limit the structure and setting method of the adjustable limit device 4, and it can adopt any one of the following embodiments:

[0043] Example 1: Reference Figure 2 As shown, the adjustable limit device 4 is a limit plate arranged on the side wall of the mounting groove 311, and a mounting hole is opened on the side wall of the mounting groove 311. In the first state, the limit plate remains extended from the mounting hole and is limitedly matched with the pressure-limiting bearing part 32; when the load sensor 63 detects the load carried by the limit plate, that is, the load carried by the plate is too large or about to be too large, the control unit 5 controls the limit plate to retract into the mounting hole to release the pressure-limiting bearing part 32, so that the pressure-limiting bearing part 32 is transferred to the second state, and the pressure-limiting bearing part 32 drives the plate to break away from the pressure of the sealing plate 11, and at the same time, the control unit 5 controls the first driving member 22 to stop driving to avoid damage to the plate.

[0044] Embodiment 2: In this embodiment, the adjustable limit device 4 is a cylinder or a hydraulic cylinder arranged at the bottom of the installation groove 311 in the vertical direction, and a pressure relief valve is arranged on the gas circuit or oil circuit of the cylinder or the hydraulic cylinder. In the first state, the cylinder or the hydraulic cylinder keeps supporting the pressure-limiting bearing part 32; when the load sensor 63 detects the load carried by the limit plate, that is, the load carried by the plate is too large or about to be too large, the control unit 5 controls the pressure relief valve to release the pressure so that the piston rod of the cylinder or the oil cylinder retracts to release the pressure-limiting bearing part 32, so that the pressure-limiting bearing part 32 enters the second state, and the pressure-limiting bearing part 32 drives the plate to break away from the pressure of the sealing plate 11, and at the same time, the control unit 5 controls the first driving member 22 to stop driving to avoid damage to the plate.

[0045] It should be noted here that the structure and setting method of the adjustable limit device 4 in the present application are not limited to the above embodiments. The above embodiments are only preferred examples of the present application, and other more different settings can also be adopted.

[0046] The technical solution protected by the present utility model is not limited to the above embodiments. It should be noted that the combination of the technical solution of any one embodiment with the technical solutions of one or more other embodiments is within the protection scope of the present utility model. Although the present utility model has been described in detail above with general descriptions and specific embodiments, on the basis of the present utility model, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all fall within the scope of protection required by the present utility model.

Claims

1. A plate airtightness detection tool, characterized in that: include: The sealing and fixing structure comprises a limiting groove, the inner wall contour of the limiting groove is the same as the outer contour of the electrode plate, and the limiting groove is used to install the electrode plate; an air inlet and an air outlet are provided inside the limiting groove, and a plurality of detection cavities are also provided on the side wall of the limiting groove, and the plurality of detection cavities are arranged around the circumference of the limiting groove; A detection unit, comprising an air pressure detection device connected to the air outlet and a pressure sensor arranged inside the detection cavity, wherein the pressure sensor is arranged in a one-to-one correspondence with the detection cavity; A workbench, used for supporting the sealing and fixing structure; A control unit is connected to the sealing and fixing structure, the detection unit and the workbench respectively.

2. The plate airtightness detection tool as claimed in claim 1, characterized in that: The sealing fixing structure also includes a sealing plate and a first driving member, wherein the first driving member is connected to the sealing plate, and the sealing plate can be moved relative to the limiting groove in a vertical direction under the drive of the first driving member to seal or open the limiting groove.

3. The plate airtightness detection tool as claimed in claim 1, characterized in that: The workbench comprises a base and a pressure-limiting bearing portion, and the upper portion of the pressure-limiting bearing portion is provided with the limiting groove.

4. The plate airtightness detection tool as claimed in claim 3, characterized in that: The pressure-limiting bearing portion has a first state in which it is fixed relative to the base in the vertical direction and a second state in which it can move relative to the base in the vertical direction; in the second state, the pressure-limiting bearing portion can drive the limiting groove to move relative to the base in the vertical direction.

5. The plate airtightness detection tool as claimed in claim 4, characterized in that: A mounting groove is provided in the middle of the base, at least a part of the pressure-limiting bearing part is provided in the mounting groove, and an adjustable limit device is provided inside the mounting groove. The adjustable limit device can cooperate with the pressure-limiting bearing part to limit the pressure-limiting bearing part so that the pressure-limiting bearing part is in the first state, or the adjustable limit device releases the pressure-limiting bearing part so that the pressure-limiting bearing part is in the second state.

6. The plate airtightness detection tool as claimed in claim 5, characterized in that: It also includes a load sensor, which is connected to the adjustable limit device and the control unit respectively. The load sensor can detect the load borne by the adjustable limit device and output a corresponding load signal to the control unit. The control unit can control the adjustable limit device to cooperate with the pressure-limiting bearing part or to disengage from the pressure-limiting bearing part according to the load signal.

7. The plate airtightness detection tool as claimed in claim 4, characterized in that: The detection unit further comprises an information component, wherein the information component comprises a leakage warning element and a leakage area indicator element.

8. The plate airtightness detection tool as claimed in claim 7, characterized in that: A plurality of leakage area indicators are provided, and the plurality of leakage area indicators are provided in one-to-one correspondence with the detection chambers.

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