Practical airtightness test fixture

Abstract

The utility model provides a practical airtightness test fixture, which relates to the technical field of airtightness detection equipment and comprises an upper cover plate, six guide positioning columns are connected to one side of the upper cover plate in a penetrating manner, a lower cover plate is fixedly connected to the bottom ends of the guide positioning columns, three vent grooves are formed in one side of the lower cover plate, and the vent grooves are communicated with the guide positioning columns. A first air outlet groove and a second air outlet groove are formed in one end of the vent groove, a first connecting pipe is fixedly connected to one side of the first air outlet groove, a second connecting pipe is fixedly connected to one side of the second air outlet groove, a bidirectional rotating mechanism is arranged on the second connecting pipe, and a hexagonal nut cap is fixedly connected to one side of the vent groove. The bidirectional rotating mechanism comprises a first optical axis. According to the utility model, the outer cylinder pipe rotates by 90 degrees or reversely rotates by 90 degrees to block the connecting pipe I or the connecting pipe II, so that a worker can conveniently carry out accurate air tightness detection on each part of the bipolar plate, the operation steps are simple, and the accuracy of the air tightness detection jig is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of airtight detection equipment, in particular to a practical airtight testing fixture. Background Art

[0002] A fuel cell stack is a device that directly converts the chemical energy of hydrogen into electrical energy through a membrane electrode. It has the advantages of high efficiency, low noise, and no harmful gas emissions, and has broad prospects for future development. The main components of the battery stack include graphite bipolar plates, which support the MEA and provide flow channels for hydrogen and oxygen to enter the MEA on both sides of the battery stack. It can also provide flow channels for the cooling circulating fluid to circulate in the battery stack. At present, the air tightness test of the bipolar plate can only be performed on the bipolar plate, but when the test fails, it is impossible to accurately determine which specific part is insufficient in air tightness. This will increase the process of staff checking where the air tightness is insufficient, making the air tightness test less accurate, so it is necessary to provide a practical air tightness test fixture. Utility Model Content

[0003] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a practical airtight test fixture, comprising: an upper cover plate, six guide positioning columns are connected through one side of the upper cover plate, the bottom end of the guide positioning columns is fixedly connected to the lower cover plate, three ventilation grooves are opened on one side of the lower cover plate, one end of the ventilation groove is opened with an air outlet groove 1 and an air outlet groove 2, one side of the air outlet groove 1 is fixedly connected to a connecting pipe 1, one side of the air outlet groove 2 is fixedly connected to a connecting pipe 2, and a bidirectional rotating mechanism is provided on the connecting pipe 2.

[0004] As a preferred implementation, a hexagonal nut cap is fixedly connected to one side of the ventilation groove.

[0005] The technical effect of adopting the above further scheme is: when the staff needs to conduct an airtightness test on the bipolar plate, first place the bipolar plate on the top of the lower cover plate, and then move the upper cover plate downward to fix and squeeze the bipolar plate. After that, the staff operates the airtight device to inject gas into the inner wall of the ventilation groove, and first blocks the inner wall of the air outlet groove one through the bidirectional rotating mechanism to detect whether the air pressure of the inner wall of the air outlet groove two passes through, and then reversely operates the bidirectional rotating mechanism, and detects whether the air pressure of the inner wall of the air outlet groove one passes through in the same way, so as to accurately know which part of the bipolar plate has an airtightness problem.

[0006] As a preferred embodiment, the bidirectional rotation mechanism includes an optical axis 1, one end of the connecting tube 2 is penetrated and connected with the optical axis 1, one end of the optical axis 1 is fixedly connected with an outer tube, the inner wall of the outer tube is connected with the inner tube through a bearing, one end of the inner tube is penetrated and fixed with a gear, one side of the gear is rotatably connected with a convex gear, one side of the convex gear is rotatably connected with a gear groove, one side of the gear groove is opened at one end of the outer tube, the inner wall of the outer tube is rotatably connected with a rotating shaft, one end of the rotating shaft is fixedly connected to one side of the convex gear, one side of the gear is fixedly connected to the optical axis 2, one end of the optical axis 1 and the optical axis 2 are both fixedly connected with a hemisphere, and one side of the two hemispheres are rotatably connected to the inner walls of the connecting tube 1 and the connecting tube 2.

[0007] The technical effect of adopting the above-mentioned further scheme is: when it is necessary to use a bidirectional rotation mechanism, the staff only needs to manually rotate the outer tube ninety degrees, and open the hemisphere on the inner wall of the connecting tube two by rotating the optical axis one. At the same time, during the rotation of the outer tube, the convex gear is rotated together through the gear groove, and then the gear and the inner tube are driven to rotate ninety degrees in the opposite direction. Finally, the gear drives the optical axis two to rotate ninety degrees, and then the inner wall of the connecting tube one is blocked by the other hemisphere. Similarly, when it is necessary to detect the air groove one, it is only necessary to rotate the outer tube ninety degrees in the opposite direction.

[0008] As a preferred implementation, a fixing hole is opened on one side of the lower cover plate.

[0009] The technical effect of adopting the above further solution is: in order to facilitate the installation of the bipolar plates, the staff can install the suction pipe through the fixed hole to perform suction work on the bipolar plates to avoid the bipolar plates from shifting when the upper cover plate moves downward.

[0010] As a preferred implementation, the hemisphere is made of stainless steel.

[0011] The technical effect of adopting the above further solution is that in the presence of oxygen, stainless steel has better rust resistance. If rust flakes are produced on the hemisphere, it is easy to increase friction with the inner wall of the connecting pipe, thereby increasing the work intensity of the staff.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] The utility model solves the problem of low accuracy of the airtight detection fixture through a bidirectional rotating mechanism and a lower cover plate. By rotating the outer tube ninety degrees or rotating ninety degrees in the opposite direction to block the connecting tube one or the connecting tube two, it is convenient for the staff to perform accurate airtightness detection on each part of the bipolar plate. The operation steps are concise, thereby increasing the accuracy of the airtight detection fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention provides a three-dimensional schematic diagram of the appearance of a practical airtight test fixture.

[0015] Figure 2 The utility model provides a side plan view of a practical airtight test fixture.

[0016] Figure 3 The top plan view of a practical airtight test fixture provided by the utility model.

[0017] Figure 4 A schematic diagram of the three-dimensional structure of a practical airtight test fixture provided by the utility model.

[0018] Figure 5 A three-dimensional structural schematic diagram of a connecting pipe of a practical airtight test fixture provided by the utility model.

[0019] Figure 6 The utility model provides a schematic diagram of the three-dimensional structure of the outer tube of a practical airtight test fixture.

[0020] Legend:

[0021] 1. Upper cover; 2. Guide and positioning column; 3. Lower cover; 4. Fixing hole; 5. Ventilation groove; 6. Air outlet groove 1; 7. Air outlet groove 2; 8. Connecting pipe 1; 9. Connecting pipe 2; 10. Optical axis 1; 11. Outer tube; 12. Bearing; 13. Inner tube; 14. Optical axis 2; 15. Hemisphere; 16. Rotating shaft; 17. Convex gear; 18. Gear groove; 19. Gear. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-6 The utility model provides a technical solution: a practical airtight test fixture, comprising: an upper cover plate 1, six guide positioning columns 2 are connected through one side of the upper cover plate 1, the bottom end of the guide positioning column 2 is fixedly connected to a lower cover plate 3, one side of the lower cover plate 3 is provided with three ventilation grooves 5, one end of the ventilation groove 5 is provided with an air outlet groove 1 6 and an air outlet groove 2 7, one side of the air outlet groove 1 6 is fixedly connected with a connecting pipe 1 8, one side of the air outlet groove 2 7 is fixedly connected with a connecting pipe 2 9, and a bidirectional rotating mechanism is provided on the connecting pipe 2 9.

[0024] like Figure 1-6 As shown, a hexagonal nut cap is fixedly connected to one side of the ventilation groove 5. When the staff needs to conduct an airtightness test on the bipolar plate, the bipolar plate is first placed on the top of the lower cover plate 3, and then the upper cover plate 1 is moved downward to fix and squeeze the bipolar plate. After that, the staff operates the airtight device to inject gas into the inner wall of the ventilation groove 5, and first blocks the inner wall of the air outlet groove 1 6 through the two-way rotating mechanism to detect whether the air pressure on the inner wall of the air outlet groove 2 7 passes through, and then reversely operates the two-way rotating mechanism to detect whether the air pressure on the inner wall of the air outlet groove 1 6 passes through in the same way, so as to accurately know which part of the bipolar plate has an airtightness problem.

[0025] like Figure 1-6 As shown, the bidirectional rotating mechanism includes an optical axis 10, one end of a connecting tube 29 penetrates and is connected with the optical axis 10, one end of the optical axis 10 is fixedly connected with an outer tube 11, the inner wall of the outer tube 11 is connected with an inner tube 13 through a bearing 12, one end of the inner tube 13 penetrates and is fixed with a gear 19, one side of the gear 19 is rotatably connected with a convex gear 17, one side of the convex gear 17 is rotatably connected with a gear groove 18, one side of the gear groove 18 is opened at one end of the outer tube 11, the inner wall of the outer tube 11 is rotatably connected with a rotating shaft 16, one end of the rotating shaft 16 is fixedly connected to one side of the convex gear 17, one side of the gear 19 is fixedly connected with an optical axis 2 14, and one end of the optical axis 10 and the optical axis 2 14 are both fixed A hemisphere 15 is fixedly connected, and one side of the two hemispheres 15 is rotatably connected to the inner walls of the connecting tube 1 8 and the connecting tube 2 9. When the bidirectional rotating mechanism is needed, the staff only needs to manually rotate the outer tube 11 ninety degrees, and open the hemisphere 15 on the inner wall of the connecting tube 2 9 by rotating the optical axis 10. At the same time, during the rotation of the outer tube 11, the convex gear 17 is rotated together through the gear groove 18, and then drives the gear 19 and the inner tube 13 to rotate ninety degrees in the opposite direction. Finally, the gear 19 drives the optical axis 2 14 to rotate ninety degrees, and then the inner wall of the connecting tube 8 is blocked by the other hemisphere 15. Similarly, when it is necessary to detect the air groove 6, it is only necessary to rotate the outer tube 11 in the opposite direction by ninety degrees.

[0026] like Figure 1-6 As shown, a fixing hole 4 is opened on one side of the lower cover plate 3. In order to facilitate the installation of the bipolar plate, the staff can install the suction pipe through the fixing hole 4 to perform suction work on the bipolar plate to avoid the bipolar plate from shifting when the upper cover plate 1 moves downward.

[0027] like Figure 1-6 As shown, the hemisphere 15 is made of stainless steel. In the presence of oxygen, stainless steel has better rust resistance. If rust flakes are produced on the hemisphere 15, it is easy to increase friction with the inner wall of the connecting pipe 8, thereby increasing the work intensity of the staff.

[0028] Working principle: When the staff needs to conduct air tightness test on the bipolar plate, first put the bipolar plate on the top of the lower cover plate 3, then install the suction pipe through the fixing hole 4, and perform air suction and fixing work on the bipolar plate, and then move the upper cover plate 1 downward to fix and squeeze the bipolar plate. After that, the staff operates the airtight device to inject gas into the inner wall of the ventilation groove 5. When it is necessary to detect the air outlet groove 7, the staff only needs to manually rotate the outer tube 11 ninety degrees, and the hemisphere 15 blocks the inner wall of the air outlet groove 1 6. Finally, check whether the air pressure on the inner wall of the air outlet groove 2 7 passes. Similarly, when it is necessary to detect the air outlet groove 1 6, it is only necessary to reversely rotate the outer tube 11 ninety degrees.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A practical airtight test fixture, characterized in that: include: An upper cover plate (1), one side of which is connected with six guide positioning columns (2), the bottom end of which is fixedly connected with a lower cover plate (3), one side of which is provided with three ventilation grooves (5), one end of which is provided with an air outlet groove 1 (6) and an air outlet groove 2 (7), one side of which is fixedly connected with a connecting pipe 1 (8), one side of which is fixedly connected with a connecting pipe 2 (9), and a bidirectional rotating mechanism is provided on the connecting pipe 2 (9).

2. A practical airtight test fixture according to claim 1, characterized in that: A hexagonal nut cap is fixedly connected to one side of the ventilation groove (5).

3. A practical airtight test fixture according to claim 1, characterized in that: The bidirectional rotating mechanism comprises an optical axis 1 (10), one end of the connecting tube 2 (9) is connected to the optical axis 1 (10), one end of the optical axis 1 (10) is fixedly connected to an outer tube (11), the inner wall of the outer tube (11) is connected to an inner tube (13) via a bearing (12), one end of the inner tube (13) is fixedly connected to a gear (19), one side of the gear (19) is rotatably connected to a convex gear (17), one side of the convex gear (17) is rotatably connected to a gear groove (18), one side of the gear groove (18) is opened at one end of the outer tube (11), the inner wall of the outer tube (11) is rotatably connected to a rotating shaft (16), one end of the rotating shaft (16) is fixedly connected to one side of the convex gear (17).

4. A practical airtight test fixture according to claim 3, characterized in that: One side of the gear (19) is fixedly connected to the second optical axis (14), one end of the first optical axis (10) and the second optical axis (14) are both fixedly connected to a hemisphere (15), and one side of the two hemispheres (15) is rotatably connected to the inner wall of the first connecting tube (8) and the second connecting tube (9).

5. A practical airtight test fixture according to claim 1, characterized in that: A fixing hole (4) is provided on one side of the lower cover plate (3).

6. A practical airtight test fixture according to claim 4, characterized in that: The hemispherical body (15) is made of stainless steel.

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