Air tightness test tool

Abstract

The air tightness testing tool comprises a tool seat body, an insertion block, a sealing ring, a threaded guide column and an air pipe joint, the left side of the tool seat body is provided with a lower catching groove with an open top surface, the left side of the lower catching groove forms a lower limiting step, the right side of the tool seat body is provided with a threaded through hole, the middle of the tool seat body is provided with a cavity, and the lower catching groove and the threaded through hole are communicated with the cavity; the inserting block is detachably connected above the lower buckling groove of the outer frame, an upper buckling groove is formed in the bottom surface of the inserting block, an upper limiting step is formed on the left side of the upper buckling groove, the upper buckling groove and the lower buckling groove are combined to define an annular buckling groove, and the annular buckling groove is used for buckling and fixing an anti-explosion valve of the battery pack; the threaded guide column is movably screwed and arranged in the threaded through hole in a penetrating manner, and a vent hole of which the left end and the right end are communicated is formed in the threaded guide column; the outer end of the right end of the threaded guide column is connected with an air pipe joint; the sealing ring is arranged between the inner end of the threaded guide column and the anti-explosion valve. Therefore, the anti-explosion valve can be kept stable, and poor testing is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of battery pack testing, and in particular to an airtightness testing fixture. Background Technology

[0002] In the field of new energy vehicle battery pack assembly, after the battery pack is assembled, an airtightness test is required. During the airtightness test, the pack is usually inflated using an explosion-proof valve, typically with the help of an inflation connector. Traditional inflation connectors rely on spring pressure to achieve a seal, but after prolonged use, the elasticity may weaken, leading to a loose seal and potential air leakage.

[0003] Therefore, there is an airtightness testing device for battery packs disclosed in Chinese Patent CN 218496338 U. This solution can achieve a high degree of fit through the cooperation of the inflation component, tightening shaft, mounting base, and connecting air pipe. However, this solution still has the following drawbacks:

[0004] 1. The inflation component mates with the connecting air tube and the mounting base, and the tightening base mates with the inflation component and the mounting base respectively. There are many connection points, which leads to high processing costs. During use, if any connection is unstable, gas leakage is likely to occur, requiring multiple tests.

[0005] 2. In this solution, the sealing ring at the connection with the explosion-proof valve lacks a limiting structure, and the sealing ring is mostly made of silicone, which may twist during use, affecting the test results.

[0006] 3. This design can only cover half of the explosion-proof valve, and the mounting base and the explosion-proof valve are not stable enough, which may cause air leakage. Utility Model Content

[0007] The purpose of this invention is to provide an airtightness testing fixture that can at least solve the above-mentioned problem and has the advantages of reducing the risk of air leakage and improving testing efficiency.

[0008] To achieve the above objectives, the solution of this utility model is:

[0009] An airtightness testing fixture includes a fixture base, a plug, a sealing ring, a threaded guide post, and a gas pipe connector;

[0010] The tooling base has a lower buckle groove with an open top surface on the left side, and a lower limit step is formed on the left side of the lower buckle groove. The tooling base has a threaded through hole on the right side, and a cavity in the middle of the tooling base. The lower buckle groove and the threaded through hole are both connected to the cavity.

[0011] The insert block is detachably connected to the upper part of the lower latching groove. The bottom surface of the insert block forms an upper latching groove. An upper limit step is formed on the left side of the upper latching groove. The upper latching groove and the lower latching groove are combined to form an annular latching groove. The annular latching groove is used to fasten and fix the explosion-proof valve of the battery pack and to limit the explosion-proof valve by using the upper limit step and the lower limit step. The annular latching groove is coaxial with the threaded through hole.

[0012] The threaded guide post is movably threaded through the threaded through hole, and the threaded guide post has a vent hole that runs through both the left and right ends; the inner end of the left end of the threaded guide post extends into the cavity, and the outer end of the right end of the threaded guide post is connected to the air pipe connector, which is connected to the vent hole.

[0013] The sealing ring is disposed between the inner end of the threaded guide post in the cavity and the explosion-proof valve engaged in the annular groove, and seals the outer periphery of the air inlet of the explosion-proof valve and the air vent of the threaded guide post.

[0014] Furthermore, the tooling base has a fastening seat on the left side, the fastening seat has a recessed lower fastening groove, and the front and rear sides of the lower fastening groove on the top surface of the fastening seat are respectively provided with positioning holes; the front and rear sides of the upper fastening groove on the bottom surface of the insert block are respectively provided with downwardly extending positioning pins, which are used to tightly fit into the positioning holes.

[0015] Furthermore, the positioning hole extends vertically through the fastening seat; the positioning pin is longer than the depth of the positioning hole and extends out of the bottom of the fastening seat.

[0016] Furthermore, the fastening seat and positioning hole of the tooling base are both semi-annular, and the lower fastening groove and upper fastening groove are both semi-annular grooves.

[0017] Furthermore, the tooling base includes an outer frame and a fixing cover; the lower snap groove is provided on the left side of the outer frame, and the cavity is formed on the right side of the outer frame; the right side of the cavity away from the lower snap groove has an opening and can detachably fix the fixing cover, and the fixing cover has a threaded through hole in the middle.

[0018] Furthermore, the outer periphery of the threaded through hole of the fixing cover is distributed with several countersunk holes; the right side of the outer frame is distributed with several locking holes corresponding to each countersunk hole; several screws are used to sequentially pass through the countersunk holes and lock into the locking holes to lock and fix the fixing cover and the outer frame.

[0019] Furthermore, the inner end of the threaded guide post has a radially protruding abutment portion, and the end face of the abutment portion forms an installation limiting groove for accommodating the sealing ring on the outer periphery of the vent hole.

[0020] Furthermore, the inner and outer sides of the mounting limiting groove are respectively provided with an inner ring retaining flange and an outer ring retaining flange, and the height of the inner ring retaining flange protruding from the end face of the abutment portion is lower than the height of the outer ring retaining flange protruding from the end face of the abutment portion.

[0021] Furthermore, a lower recess is formed on the right side of the lower buckle groove, and a lower limiting step of the sealing ring is formed between the lower recess and the lower buckle groove; an upper recess is also formed on the right side of the upper buckle groove, and an upper limiting step of the sealing ring is formed between the upper recess and the upper buckle groove; the upper recess and the lower recess combine to form an annular recess, the annular recess connects to the cavity, and the left side of the sealing ring is pressed by the upper limiting step of the sealing ring and the lower limiting step of the sealing ring.

[0022] Furthermore, a wing nut is screwed onto the right side of the threaded through hole extending from the tooling base of the threaded guide post.

[0023] By adopting the above technical solution, the airtightness testing fixture of this utility model can achieve stable and reliable limiting and fixing of the explosion-proof valve by fitting the insert block above the upper locking groove. This ensures that the explosion-proof valve is subjected to uniform force during the test, is not easily tilted, maintains stability with the testing fixture, avoids test defects, improves test efficiency, and ensures accurate test results. Furthermore, this testing fixture only has two connection points: the threaded guide post to the explosion-proof valve and the threaded guide post to the air pipe connector, greatly reducing the possibility of air leakage due to improper use. Moreover, only the air pipe connector and the sealing ring are susceptible to damage; both parts are standard components, making replacement simple and inexpensive. Attached Figure Description

[0024] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0025] Figure 2 This is a cross-sectional view of an embodiment of the present utility model;

[0026] Figure 3 This is an exploded view (I) of an embodiment of the present utility model;

[0027] Figure 4 This is an exploded view (II) of an embodiment of the present utility model.

[0028] Label Explanation:

[0029] Tooling base 1, outer frame 11, lock hole 111, fixing cover 12, countersunk hole 121, lower snap groove 13, lower limit step 131, threaded through hole 14, cavity 15, opening 151, snap-fit ​​seat 16, positioning hole 161, lower recess 17, sealing ring lower limit step 171, insert block 2, upper snap groove 21, upper limit step 211, positioning pin 22, upper recess 23, sealing ring upper limit step 231, sealing ring 3, threaded guide post 4, vent hole 41, abutment part 42, installation limit groove 421, inner ring retaining flange 422, outer ring retaining flange 423, air pipe connector 5, annular snap groove 6, annular recess 7, screw 8, wing nut 9, explosion-proof valve 10. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] like Figures 1 to 4 As shown, an airtightness testing fixture of this embodiment includes a fixture base 1, an insert block 2, a sealing ring 3, a threaded guide post 4, and an air pipe connector 5.

[0032] The tooling base 1 has a lower locking groove 13 with an open top surface on the left side, and a lower limiting step 131 is formed on the left side of the lower locking groove 13. The tooling base 1 has a threaded through hole 14 on the right side, and a cavity 15 in the middle of the tooling base 1. The lower locking groove 13 and the threaded through hole 14 are both connected to the cavity 15.

[0033] The insert 2 is detachably connected above the lower latching groove 13. The bottom surface of the insert 2 has an upper latching groove 21. An upper limit step 211 is formed on the left side of the upper latching groove 21. The upper latching groove 21 and the lower latching groove 13 are combined to form an annular latching groove 6. The annular latching groove 6 is used to fasten and fix the explosion-proof valve 10 of the battery pack and to limit the explosion-proof valve 10 by using the upper limit step 211 and the lower limit step 131. The annular latching groove 6 is coaxially arranged with the threaded through hole 14.

[0034] The threaded guide post 4 is movably threaded through the threaded through hole 14, and the threaded guide post 4 has a vent hole 41 that passes through both the left and right ends; the inner end of the left end of the threaded guide post 4 extends into the cavity 15, and the outer end of the right end of the threaded guide post 4 is connected to the air pipe connector 5, which is connected to the vent hole 41.

[0035] The sealing ring 3 is disposed between the inner end of the threaded guide post 4 in the cavity 15 and the explosion-proof valve 10 which is engaged in the annular groove 6, and seals the air inlet of the explosion-proof valve 10 and the outer periphery of the vent hole 41 of the threaded guide post 4.

[0036] In use, first install the threaded guide post 4 into the threaded through hole 14, then install the air pipe connector 5 on the right end of the threaded guide post 4, and then install the sealing ring 3 on the left end of the threaded guide post 4 in the cavity 15; then use the lower limit step 131 of the lower snap groove 13 on the left side of the tooling seat 1 to hold the lower part of the explosion-proof valve 10, so that the lower part of the explosion-proof valve 10 can be embedded in the lower snap groove 13, and then install the insert block 2, and use the upper limit step 211 to hold the upper part of the explosion-proof valve 10, so that the explosion-proof valve 10 is completely surrounded and limited by the annular snap groove 6 formed by the lower snap groove 13 and the upper snap groove 21; finally, rotate the threaded guide post 4 to move it to the left in the threaded through hole 14, so that the left end of the threaded guide post 4 squeezes the sealing ring 3 to fit with the explosion-proof valve 10, and the air tightness test can be performed through the vent hole 41.

[0037] Therefore, the airtightness testing fixture of this embodiment, through the insertion block 2 engaging with the upper retaining groove 21, can achieve stable and reliable limiting and fixing of the explosion-proof valve 10, ensuring that the explosion-proof valve 10 is subjected to uniform force during the test, is not prone to tilting, maintains stability with the testing fixture, avoids test defects, improves test efficiency, and ensures accurate test results. At the same time, in this embodiment, the testing fixture only has two connection points: the threaded guide post 4 and the explosion-proof valve 10, and the threaded guide post 4 and the air pipe connector 5, greatly reducing the possibility of air leakage due to improper use. Furthermore, only the air pipe connector 5 and the sealing ring 3 may be damaged in the entire fixture; both parts are standard parts, making replacement simple and inexpensive.

[0038] In this embodiment, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is not a limitation on the structure of this embodiment.

[0039] Specifically, such as Figure 3 and Figure 4 The tooling base 1 may have a fastening seat 16 on its left side, with a lower fastening groove 13 recessed within the fastening seat 16. Positioning holes 161 are respectively provided on the front and rear sides of the lower fastening groove 13 on the top surface of the fastening seat 16. Positioning pins 22 extending downwards are respectively provided on the front and rear sides of the upper fastening groove 21 on the bottom surface of the insert block 2. The positioning pins 22 are used for tight fitting into the positioning holes 161. The engagement of the positioning pins 22 and the positioning holes 161 allows for quick installation and fixation between the insert block 2 and the tooling base 1.

[0040] Furthermore, the positioning hole 161 extends vertically through the fastening seat 16; the length of the positioning pin 22 can be greater than the depth of the positioning hole 161 and extend beyond the bottom of the fastening seat 16. Therefore, after testing, the positioning pin 22 can be easily ejected, allowing for quick disassembly of the insert block 2.

[0041] In this embodiment, the threaded guide post 4, which passes through the outer periphery of the threaded through hole 14, may be provided with external threads to facilitate mating with the threaded through hole 14. Furthermore, the vent hole 41 at the right end of the threaded guide post 4 may be provided with internal threads to facilitate screwing in the air pipe connector 5.

[0042] The fastening seat 16 and positioning hole 161 of the tooling base 1 can both be semi-annular, and the lower fastening groove 13 and upper fastening groove 21 can both be semi-annular grooves, so as to fasten the explosion-proof valve 10. Of course, this is not a limitation, and can be adapted according to the shape of the explosion-proof valve 10.

[0043] In this embodiment, the inner end of the threaded guide post 4 may have a radially protruding abutment portion 42 to facilitate contact with the explosion-proof valve 10; the end face of the abutment portion 42 may form an installation limiting groove 421 for accommodating the sealing ring 3 on the outer periphery of the vent hole 41. This facilitates the installation and fixing of the sealing ring 3, ensuring a sealing effect. In this embodiment, the cross-section of the sealing ring 3 may be rectangular, and the cross-section of the installation limiting groove 421 may also be rectangular, but it is not limited to these.

[0044] Furthermore, the inner and outer sides of the mounting limiting groove 421 may respectively have an inner ring retaining flange 422 and an outer ring retaining flange 423. The height of the inner ring retaining flange 422 protruding from the end face of the abutment portion 42 is lower than the height of the outer ring retaining flange 423 protruding from the end face of the abutment portion 42. Thus, when the left end of the threaded guide post 4 abuts against the explosion-proof valve 10, the outer ring retaining flange 423 and the left end of the sealing ring 3 can abut against the explosion-proof valve 10, while the inner ring retaining flange 422 is lower in height, which can avoid blocking the air inlet of the explosion-proof valve 10, ensuring that the gas will not be blocked and can smoothly enter the explosion-proof valve 10.

[0045] See Figure 2 and Figure 4 A lower recess 17 can also be formed on the right side of the lower groove 13, and a lower limiting step 171 of the sealing ring is formed between the lower recess 17 and the lower groove 13; an upper recess 23 can also be formed on the right side of the upper groove 21, and an upper limiting step 231 of the sealing ring is formed between the upper recess 23 and the upper groove 21; the upper recess 23 and the lower recess 17 combine to form an annular recess 7, the annular recess 7 is connected to the cavity 15, and the left side of the sealing ring 3 is pressed by the upper limiting step 231 and the lower limiting step 171 of the sealing ring.

[0046] In this embodiment, by setting the lower limit step 171 and the upper limit step 231 of the sealing ring, as well as the installation limit groove 421, the sealing ring 3 can be limited together, controlling the compression amount and deformation position of the sealing ring 3, ensuring the sealing compression amount, and reducing the phenomenon of air leakage.

[0047] like Figure 4 As shown, in this embodiment, the tooling base 1 may include an outer frame 11 and a fixing cover 12; the outer frame 11 is provided with a fastening seat 16 and a lower fastening groove 13 on the left side, and the cavity 15 is formed inside the right side of the outer frame 11; the cavity 15 has an opening 151 on the right side away from the lower fastening groove 13 and can detachably fix the fixing cover 12, and the fixing cover 12 is provided with a threaded through hole 14 in the middle.

[0048] Therefore, during installation, the fixing cover 12 can be disassembled first, and the abutting part 42 of the threaded guide post 4 can be inserted into the cavity 15 from the opening 151. Then, the fixing cover 12 and the outer frame 11 can be locked, making the installation more convenient.

[0049] Specifically, the outer periphery of the threaded through hole 14 of the fixing cover 12 may be distributed with several countersunk holes 121, and this embodiment takes four as an example; the right side of the outer frame 11 is distributed with several locking holes 111 corresponding to each countersunk hole 121; several screws 8 are used to sequentially pass through the countersunk holes 121 and lock into the locking holes 111 to lock and fix the fixing cover 12 to the outer frame 11. The locking with screws 8 ensures a good fixing effect between the outer frame 11 and the fixing cover 12. Furthermore, the outer frame 11 and the fixing cover 12 only need to be locked when the test fixture is used for the first time, and can be used directly without repeated disassembly and locking in subsequent testing processes.

[0050] In this embodiment, a wing nut 9 can be screwed onto the portion of the threaded guide post 4 extending out of the threaded through hole 14 of the tooling base 1. Through the cooperation of the wing nut 9 and the tooling base 1, the threaded guide post 4 can move left and right within the threaded through hole 14, making operation more convenient and simple.

[0051] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0052] In the description of the embodiments of this application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use, or the orientations or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

Claims

1. Airtightness test tool characterized in that: It comprises a tool base, an insert block, a sealing ring, a threaded guide post and an air pipe joint; The left side of the tool base has a top-opened lower buckling groove, and a lower limiting step is formed on the left side of the lower buckling groove; the right side of the tool base has a threaded through hole; the middle part of the tool base has a cavity, and the lower buckling groove and the threaded through hole are both communicated with the cavity; The insert block is detachably connected above the lower buckling groove, and an upper buckling groove is formed on the bottom surface of the insert block; an upper limiting step is formed on the left side of the upper buckling groove; the upper buckling groove and the lower buckling groove combine to form an annular buckling groove, which is used to buckling and fixing the explosion-proof valve of the battery pack and limiting the explosion-proof valve by using the upper limiting step and the lower limiting step; and the annular buckling groove is coaxially arranged with the threaded through hole; The threaded guide post is movably screwed into the threaded through hole, and the threaded guide post is internally provided with an air hole penetrating through the left and right ends; the left end of the threaded guide post extends into the cavity, and the right end of the threaded guide post is connected with the air pipe joint, which is communicated with the air hole; The sealing ring is arranged between the inner end of the threaded guide post in the cavity and the buckled explosion-proof valve in the annular buckling groove, and is sealed to the air inlet hole of the explosion-proof valve and the outer periphery of the air hole of the threaded guide post.

2. The air tightness test tool of claim 1, wherein: The left side of the tool base has a buckling seat, the lower buckling groove is concavely arranged in the buckling seat, and the lower buckling groove of the top surface of the buckling seat is respectively provided with a positioning hole on the front and back sides; the upper buckling groove of the bottom surface of the insert block is respectively provided with a downward extending positioning pin on the front and back sides, which is used to tightly fit into the positioning hole.

3. The air tightness test tool of claim 2, wherein: The positioning hole penetrates through the buckling seat from top to bottom; the length of the positioning pin is greater than the depth of the positioning hole and extends out of the bottom of the buckling seat.

4. The air tightness test tool of claim 2, wherein: The buckling seat and the positioning hole of the tool base are both half-ring bodies, and the lower buckling groove and the upper buckling groove are both half-ring grooves.

5. The air tightness test tool of claim 1, wherein: The tool base comprises an outer frame and a fixed cover; the lower buckling groove is arranged on the left side of the outer frame, and the cavity is formed on the right side of the outer frame; the right side of the cavity away from the lower buckling groove has an opening and can detachably fix the fixed cover; the threaded through hole is arranged in the middle part of the fixed cover.

6. The air tightness test tool of claim 5, wherein: The threaded through hole of the fixed cover is distributed with a plurality of counterbores on the outer periphery; the right side of the outer frame is distributed with a plurality of lock holes corresponding to each counterbores; a plurality of screws are used to sequentially pass through the counterbores and lock to the lock holes to lock and fix the fixed cover and the outer frame.

7. The air tightness test tool of claim 1, wherein: The inner end of the threaded guide post has a radially outward protruding abutting portion, and the end face of the abutting portion is formed with a mounting limiting groove for accommodating the sealing ring on the outer periphery of the air hole.

8. The air tightness test tool of claim 7, wherein: The mounting limiting groove is respectively provided with an inner ring flange and an outer ring flange on the inner and outer sides; the height of the inner ring flange protruding from the end face of the abutting portion is lower than the height of the outer ring flange protruding from the end face of the abutting portion.

9. The air tightness test tool of claim 7, wherein: The right side of the lower buckling groove is also formed with a lower recess, and a lower limiting step of the sealing ring is formed between the lower recess and the lower buckling groove; the right side of the upper buckling groove is also formed with an upper recess, and an upper limiting step of the sealing ring is formed between the upper recess and the upper buckling groove; the upper recess and the lower recess combine to form an annular recess, which is communicated with the cavity and the left side of the sealing ring is pressed by the upper limiting step and the lower limiting step of the sealing ring.

10. The air tightness test tool of claim 1, wherein: The part of the threaded guide post extending out of the right side of the threaded through hole of the tool base is screwed with a butterfly nut.

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