Heat pipe leak detection tool

By designing the heat pipe leakage detection tool, using the combination of the shell, brake ring, release ring and reset ring, the traditional heat pipe leakage detection tool is solved, and the rapid and reliable heat pipe connection and efficient leakage detection process are achieved, which improves production efficiency and product quality.

CN223205051UActive Publication Date: 2025-08-08SHANGHAI HUHANG SATELLITE TECH CO LTD
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Patent Information

Application Number
CN202422387364.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-29
Publication Date
2025-08-08
Estimated Expiration
2034-09-29

AI Technical Summary

Technical Problem

Traditional heat pipe leakage detection tooling takes a long time and is inefficient in connecting heat pipes and leakage detection equipment, and cannot meet the rapid leakage detection needs of large-scale production.

Method used

A heat pipe leakage detection tool is designed, including a housing, brake ring, release ring and reset ring. The locking and unlocking position is achieved through the movement of the release ring, and the heat pipe and leakage detection device are quickly and reliably connected, and the sealing property is improved by using the gasket ring and the sealing ring.

Benefits of technology

It realizes the rapid and reliable connection between the heat pipe and the leakage detection device, improves the leakage detection efficiency and production efficiency, and ensures product quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a heat pipe leak detection tool, and belongs to the technical field of leak detection tools. The heat pipe leakage detection tool comprises a shell, a brake ring, a release ring and a reset ring, a containing cavity extending in the first axis direction is formed in the shell, a heat pipe can be inserted into the containing cavity along the first axis, and the other end of the shell can be connected with a leakage detection device; the brake ring is mounted in the accommodating cavity, and the brake ring is provided with at least two clamping jaws which are annularly arranged on the peripheral side of the heat pipe and are arranged at intervals; the first end of the release ring is located in the brake ring, the second end of the release ring is located outside the containing cavity, and the reset ring sleeves the brake ring and can be in limiting fit with the release ring. The release ring can move along a first axis, so that the release ring has a locking position and an unlocking position; when the release ring is located at the locking position, the release ring can enable the reset ring to provide acting force towards the first axis for the clamping jaw so that the clamping jaw can clamp the heat pipe. When the release ring is located at the unlocking position, the first end of the release ring can open the clamping jaw so that the heat pipe can be pulled out of the containing cavity.
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Description

Technical Field

[0001] The present application relates to the technical field of leak detection tooling, and in particular to a heat pipe leak detection tooling. Background Art

[0002] Heat pipes, as efficient heat transfer components, are widely used in electronics and solar cooling applications. However, ensuring their proper function is crucial. Traditional leak detection tools are time-consuming and inefficient when connecting heat pipes to leak detection equipment, making them inefficient and unable to meet the demands of rapid leak detection in large-scale production.

[0003] Therefore, there is an urgent need for a heat pipe leak detection tool to solve the above problems. Utility Model Content

[0004] The present application aims to solve or at least alleviate some or all of the above problems. To this end, the present application aims to provide a heat pipe leak detection tool that can quickly and reliably connect the heat pipe and the leak detection device to improve the leak detection efficiency, thereby improving production efficiency and product quality.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] The present application provides a heat pipe leak detection tool for connecting a leak detection device and a heat pipe, the heat pipe leak detection tool comprising:

[0007] a housing, wherein the housing has a receiving cavity extending along a first axis, and the heat pipe can be inserted into the receiving cavity along the first axis;

[0008] A brake ring, which is installed in the accommodating cavity and has at least two claws arranged around the heat pipe and spaced apart;

[0009] a release ring, wherein a first end of the release ring is located inside the brake ring and a second end of the release ring is located outside the accommodating cavity, and the release ring is movable along the first axis so as to have a locked position and an unlocked position;

[0010] A reset ring, which is sleeved outside the brake ring and can be limitedly matched with the release ring;

[0011] When the release ring is in the locking position, the release ring enables the reset ring to provide the claw with a force acting toward the first axis, so that the claw clamps the heat pipe;

[0012] When the release ring is in the unlocking position, the first end of the release ring can open the claws, so that the heat pipe can be pulled out of the accommodating cavity.

[0013] As an optional solution of the heat pipe leak detection tool, the heat pipe leak detection tool also includes a sealing gasket, the heat pipe can be inserted into the sealing gasket, the accommodating cavity has a limiting surface, and the sealing gasket is located between the limiting surface and the outer wall surface of the clamping claw.

[0014] As an optional solution of the heat pipe leak detection tool, the inner hole of the sealing gasket is a flared hole at one end close to the clamping claw, and the outer wall surface of the clamping claw abuts against the inner wall surface of the flared hole.

[0015] As an optional solution for the heat pipe leak detection tool, the heat pipe leak detection tool also includes a sealing ring, the reset ring includes a guide portion and a flared portion connected to the guide portion, the guide portion is slidably mounted on the outside of the brake ring along the first axis, and the sealing ring is located between the inner wall surface of the flared portion and the outer wall surface of the sealing gasket ring.

[0016] As an optional solution of the heat pipe leak detection tool, the accommodating cavity has a first guide channel that is slidably matched with the guide part.

[0017] As an optional solution for the heat pipe leak detection tool, the accommodating cavity has a limiting channel, which is connected to one end of the first guide channel away from the second end of the release ring. The diameter of the limiting channel is smaller than the maximum diameter of the flared portion and larger than the diameter of the first guide channel.

[0018] As an optional solution for the heat pipe leak detection tool, the accommodating cavity has a second guide channel that slides with the release ring, the second guide channel is connected to one end of the first guide channel close to the second end of the release ring, and the diameter of the second guide channel is smaller than the diameter of the first guide channel.

[0019] As an optional solution for the heat pipe leak detection tool, the outer wall of the release ring has a limiting step, and the reset ring has a limiting portion that can abut against the limiting step. When the release ring moves from the unlocking position to the locking position, the limiting step abuts against the limiting portion and causes the reset ring to move together with the release ring.

[0020] As an optional solution of the heat pipe leak detection tool, the inner wall surface of the clamping claw has a first guiding inclined surface, and the end surface of the first end of the release ring has a second guiding inclined surface that matches the first guiding inclined surface.

[0021] As an optional solution for the heat pipe leak detection tool, the shell includes a first shell and a second shell, the first shell has a threaded hole inside, and the second shell has an external thread threadedly connected to the threaded hole outside, and the first shell and the second shell cooperate to form the accommodating cavity.

[0022] The beneficial effects of this application are:

[0023] The heat pipe leak detection tool provided by the present application includes a shell, a brake ring, a release ring and a reset ring. The shell has a housing extending along a first axis. The heat pipe can be inserted into the housing along the first axis. The brake ring, the release ring and the reset ring are all installed in the housing. The release ring can move along the first axis so that the release ring has a locked position and an unlocked position. When the release ring is in the locked position, the release ring can enable the reset ring to provide a force toward the first axis to the claws so that the claws clamp the heat pipe; when the release ring is in the unlocked position, the first end of the release ring can open the claws so that the heat pipe can be withdrawn from the housing, thereby realizing that the heat pipe leak detection tool can quickly and reliably connect the heat pipe and the leak detection device, thereby improving the leak detection efficiency, and further improving the production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present application and these drawings without any creative work.

[0025] Figure 1 This is a schematic structural diagram of a heat pipe leak detection tool provided in an embodiment of the present application;

[0026] Figure 2 is a schematic cross-sectional view of a heat pipe leak detection tool provided in an embodiment of the present application;

[0027] Figure 3 yes Figure 2 Exploded diagram of the medium heat pipe leak detection tooling;

[0028] Figure 4 yes Figure 1 Schematic diagram of the exploded view of the medium heat pipe leak detection tool.

[0029] Reference numerals:

[0030] 100. Heat pipe;

[0031] 1. Shell; 10. Accommodating cavity; 101. Limiting surface; 102. First guide channel; 103. Limiting channel; 104. Second guide channel; 105. Heat pipe plugging channel; 106. Connector channel; 11. First shell; 111. Connector; 12. Second shell; 121. Circular portion; 122. Non-circular portion;

[0032] 2. Braking ring; 21. Clamping claw; 211. First guide slope; 22. Base;

[0033] 3. Release ring; 31. Second guide slope; 32. Limiting step; 33. Pressing ring;

[0034] 4. Reset ring; 41. Guide portion; 42. Expanding portion; 43. Limiting portion;

[0035] 5. Sealing ring; 51. Expanded hole;

[0036] 6. Sealing ring. DETAILED DESCRIPTION

[0037] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0038] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0039] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0040] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0041] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values that do not use relative terms should also be disclosed as specific values with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0042] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0044] like Figures 1 to 4As shown, the heat pipe leak detection tool provided in the present application includes a shell 1, a brake ring 2, a release ring 3 and a reset ring 4. The shell 1 has a accommodating cavity 10 extending along the first axis, and the heat pipe 100 can be inserted into the accommodating cavity 10 along the first axis. The other end of the shell 1 can be connected to the leak detection device; the brake ring 2 is installed in the accommodating cavity 10, and the brake ring 2 has at least two claws 21 arranged around the heat pipe 100 and spaced apart; the first end of the release ring 3 is located in the brake ring 2, and the second end thereof is located outside the accommodating cavity 10. The release ring 3 can move along the first axis so that the release ring 3 has a locked position and an unlocked position; the reset ring 4 is sleeved on the outside of the brake ring 2 and can cooperate with the release ring 3 in a limited position. When the release ring 3 is in the locking position, the release ring 3 can enable the reset ring 4 to provide a force toward the first axis for the claw 21, so that the claw 21 clamps the heat pipe 100; when the release ring 3 is in the unlocking position, the first end of the release ring 3 can open the claw 21, so that the heat pipe 100 can be pulled out of the accommodating cavity 10, thereby enabling the heat pipe leak detection tool to quickly and reliably connect the heat pipe 100 and the leak detection device, thereby improving the leak detection efficiency, and thereby improving production efficiency and product quality.

[0045] When the release ring 3 moves along the first axis from the locked position to the unlocked position (i.e., toward the interior of the accommodating chamber 10), the release ring 3 may open the claw 21 in such a manner that: the inner wall surface of the claw 21 has a first guiding slope 211, and the end surface of the first end of the release ring 3 has a second guiding slope 31 that cooperates with the first guiding slope 211. When the release ring 3 moves toward the interior of the accommodating chamber 10, the second guiding slope 31 of the release ring 3 can exert a force on the first guiding slope 211 of the claw 21 away from the first axis, thereby opening the claw 21 and allowing the heat pipe 100 to be removed.

[0046] When the release ring 3 moves from the unlocked position to the locked position along the first axis (i.e., when it moves toward the outside of the accommodating chamber 10), the reset ring 4 moves with the release ring 3 as follows: the outer peripheral wall of the release ring 3 has a limiting step 32, and the reset ring 4 has a limiting portion 43 that can abut against the limiting step 32. When the release ring 3 moves from the unlocked position to the locked position, the limiting step 32 abuts against the limiting portion 43 and causes the reset ring 4 to move with the release ring 3, thereby causing the reset ring 4 to provide a force toward the first axis for the claw 21, so that the claw 21 clamps the heat pipe 100.

[0047] To improve the sealing performance of the heat pipe leak detection tool, the tool also includes a sealing ring 5, into which the heat pipe 100 can be inserted. The accommodating cavity 10 has a limiting surface 101, and the sealing ring 5 is positioned between the limiting surface 101 and the outer wall of the claw 21. Furthermore, when compressed, the sealing ring 5 provides a force for the brake ring 2 to move outward from the accommodating cavity 10 along the first axis. It will be appreciated that both the sealing ring 5 and the release ring 3 have through-holes for inserting the heat pipe 100.

[0048] In this embodiment, the inner hole of the sealing ring 5 is formed into a flared hole 51 at the end closest to the claw 21, and the outer wall of the claw 21 abuts the inner wall of the flared hole 51. This arrangement improves the precision of the fit between the claw 21 and the sealing ring 5, further enhancing the sealing performance at the mating point between them. Similarly, the limiting surface 101 within the accommodating cavity 10 is planar, and the surface of the sealing ring 5 that mates with this limiting surface 101 is also planar. This not only improves the sealing performance between the sealing ring 5 and the limiting surface 101, but also ensures that the sealing ring 5 is subjected to balanced force under the action of the limiting surface 101.

[0049] The heat pipe leak detection tool also includes a sealing ring 6. The reset ring 4 includes a guide portion 41 and a flared portion 42 connected to the guide portion 41. The guide portion 41 is slidably mounted on the outside of the brake ring 2 along the first axis. The sealing ring 6 is located between the inner wall surface of the flared portion 42 and the outer wall surface of the sealing gasket ring 5. The double-layer sealing of the sealing ring 6 and the sealing gasket ring 5 ensures the sealing performance of the heat pipe leak detection tool as a whole and improves the detection accuracy. In addition, after the sealing ring 6 is compressed, it can also provide a force for the reset ring 4 to move along the first axis toward the outside of the accommodating chamber 10. Under the action of this force, the reset ring 4 can generate a force (i.e., a radial force) on the claws 21 of the brake ring 2 toward the first axis, so that the claws 21 clamp the heat pipe 100.

[0050] In order to ensure the stability of the movement of the reset ring 4, the accommodating cavity 10 has a first guide channel 102 that slides with the guide portion 41, so that the reset ring 4 moves along the first axis relative to the first guide channel 102, avoiding dislocation of the reset ring 4 and affecting the normal use of the brake ring 2.

[0051] Furthermore, the accommodating chamber 10 has a limiting channel 103, which is connected to the end of the first guide channel 102 away from the second end of the release ring 3. The diameter of the limiting channel 103 is smaller than the maximum diameter of the flared portion 42 and larger than the diameter of the first guide channel 102. With this arrangement, when the reset ring 4 moves out of the accommodating chamber 10 along the first axis with the release ring 3, or when the reset ring 4 moves out of the accommodating chamber 10 under the action of the sealing ring 6, the limiting channel 103 can generate a force (i.e., a radial force) on the flared portion 42 of the reset ring 4 toward the first axis. The flared portion 42 then generates a radial force on the claw 21, so that the claw 21 can clamp the heat pipe 100.

[0052] To ensure the stability of the release ring 3's movement, the accommodating chamber 10 has a second guide channel 104 that slidably engages with the release ring 3. The second guide channel 104 is connected to the first guide channel 102 at one end near the second end of the release ring 3. The diameter of the second guide channel 104 is smaller than that of the first guide channel 102. This second guide channel 104 provides positioning and guidance for the release ring 3. Furthermore, a stepped surface is formed at the junction of the second guide channel 104 and the first guide channel 102. This stepped surface also limits the travel of the reset ring 4, thereby limiting the travel of the release ring 3.

[0053] To facilitate assembly and disassembly of the heat pipe leak detection tool, the housing 1 includes a first shell 11 and a second shell 12. The first shell 11 has a threaded hole, and the second shell 12 has external threads that are threadedly connected to the threaded hole. The first shell 11 and the second shell 12 cooperate to form a receiving chamber 10. When assembling the first shell 11 and the second shell 12, it is only necessary to thread the second shell 12 to the first shell 11, which is simple and efficient.

[0054] In one embodiment, the end of the first shell 11 away from the second shell 12 has a connector 111 for connecting to a leak detection device. The connector 111 defines a connector passage 106 that communicates with the accommodating chamber 10. Specifically, a hose for the leak detection device is sheathed over the connector 111. In other embodiments, the connection between the first shell 11 and the leak detection device can be implemented in other ways. For example, the connector 111 of the first shell 11 can be removably and quickly connected to the rigid tube of the leak detection device via a quick-connect connector.

[0055] Furthermore, within the first shell 11, a heat pipe insertion passage 105 is provided between the joint passage 106 and the threaded hole. The diameter of the joint passage 106 is smaller than that of the heat pipe insertion passage 105, and the diameter of the heat pipe insertion passage 105 is smaller than that of the threaded hole. In other words, the joint passage 106, the heat pipe insertion passage 105, and the threaded hole are arranged as stepped holes. The stepped surface between the joint passage 106 and the heat pipe insertion passage 105 can limit the heat pipe 100. That is, the maximum position of the heat pipe 100 inserted into the accommodating chamber 10 is the position where the end of the heat pipe 100 abuts the stepped surface between the heat pipe insertion passage 105 and the joint passage 106. The stepped surface between the heat pipe insertion passage 105 and the threaded hole is the aforementioned limiting surface 101. This limiting surface 101 can limit the sealing gasket 5 and the sealing ring 6, thereby limiting the movement limit of the brake ring 2, the reset ring 4, and the release ring 3 within the accommodating chamber 10.

[0056] In one embodiment, the second shell 12 includes a circular portion 121 and a non-circular portion 122. The outer wall of the circular portion 121 has external threads, which are used to threadably connect with the threaded hole of the first shell 11. The second shell 12 is then screwed together with the non-circular portion 122 using a wrench or other tool, thereby achieving a threaded connection between the second shell 12 and the first shell 11. For example, the non-circular portion 122 can be a regular hexagonal prism or other regular polygonal prism, which is not limited here.

[0057] The heat pipe leak detection tool provided in the present application can quickly and reliably connect the heat pipe 100 and the leak detection device. The connection has excellent sealing performance. The high efficiency and reliability during operation can meet the production process requirements for leak detection of the heat pipe 100. Furthermore, the leak detection device can efficiently and accurately detect trace leaks in the heat pipe 100, thereby improving production efficiency and product quality.

[0058] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A heat pipe leak detection tool for connecting a leak detection device and a heat pipe (100), characterized in that: The heat pipe leak detection tool comprises: A housing (1), wherein the housing (1) has a housing cavity (10) extending along a first axis, and the heat pipe (100) can be inserted into the housing cavity (10) along the first axis; A brake ring (2), the brake ring (2) being installed in the accommodating cavity (10), and the brake ring (2) having at least two claws (21) arranged around the circumference of the heat pipe (100) and spaced apart; a release ring (3), wherein a first end of the release ring (3) is located inside the brake ring (2), and a second end of the release ring (3) is located outside the accommodating cavity (10), and the release ring (3) is movable along the first axis so that the release ring (3) has a locked position and an unlocked position; A reset ring (4), the reset ring (4) being sleeved outside the brake ring (2) and capable of being positionally engaged with the release ring (3); When the release ring (3) is in the locking position, the release ring (3) enables the reset ring (4) to provide the claw (21) with a force acting toward the first axis, so that the claw (21) clamps the heat pipe (100); When the release ring (3) is in the unlocking position, the first end of the release ring (3) can open the claw (21) so that the heat pipe (100) can be pulled out of the accommodating cavity (10).

2. The heat pipe leak detection tool according to claim 1, characterized in that: The heat pipe leak detection tool further comprises a sealing gasket (5), the heat pipe (100) can be inserted into the sealing gasket (5), the accommodating cavity (10) has a limiting surface (101), and the sealing gasket (5) is located between the limiting surface (101) and the outer wall surface of the clamping claw (21).

3. The heat pipe leak detection tool according to claim 2, characterized in that: The inner hole of the sealing gasket ring (5) is a flared hole (51) at one end close to the clamping claw (21), and the outer wall surface of the clamping claw (21) abuts against the inner wall surface of the flared hole (51).

4. The heat pipe leak detection tool according to claim 2, characterized in that: The heat pipe leak detection tool also includes a sealing ring (6), the reset ring (4) includes a guide portion (41) and a flared portion (42) connected to the guide portion (41), the guide portion (41) is slidably mounted outside the brake ring (2) along the first axis, and the sealing ring (6) is located between the inner wall surface of the flared portion (42) and the outer wall surface of the sealing gasket ring (5).

5. The heat pipe leak detection tool according to claim 4, characterized in that: The accommodating cavity (10) has a first guide channel (102) that is slidably engaged with the guide portion (41).

6. The heat pipe leak detection tool according to claim 5, characterized in that: The accommodating cavity (10) has a limiting channel (103), which is connected to an end of the first guide channel (102) away from the second end of the release ring (3), and the diameter of the limiting channel (103) is smaller than the maximum diameter of the flared portion (42) and larger than the diameter of the first guide channel (102).

7. The heat pipe leak detection tool according to claim 5, characterized in that: The accommodating cavity (10) has a second guide channel (104) that is slidably engaged with the release ring (3), and the second guide channel (104) is connected to an end of the first guide channel (102) close to the second end of the release ring (3), and the diameter of the second guide channel (104) is smaller than the diameter of the first guide channel (102).

8. The heat pipe leak detection tool according to claim 1, characterized in that: The outer peripheral wall of the release ring (3) has a limiting step (32), and the reset ring (4) has a limiting portion (43) capable of abutting against the limiting step (32). When the release ring (3) moves from the unlocking position to the locking position, the limiting step (32) abuts against the limiting portion (43) and causes the reset ring (4) to move together with the release ring (3).

9. The heat pipe leak detection tool according to claim 1, characterized in that: The inner wall surface of the clamping claw (21) has a first guiding inclined surface (211), and the end surface of the first end of the release ring (3) has a second guiding inclined surface (31) that matches the first guiding inclined surface (211).

10. The heat pipe leak detection tool according to any one of claims 1 to 9, characterized in that: The housing (1) comprises a first shell (11) and a second shell (12); the first shell (11) has a threaded hole inside, and the second shell (12) has an external thread threadedly connected to the threaded hole outside; the first shell (11) and the second shell (12) cooperate to form the accommodating cavity (10).