Sealing device for leak detection and leak detection system

Abstract

The utility model discloses a sealing device for leak hunting and a leak hunting system, and the sealing device for leak hunting comprises a sleeve which is provided with a first end and a second end which are oppositely arranged; the movable part is arranged in the sleeve, and a first air channel used for being externally connected with a pipeline is formed in the movable part; one end of the pull rod extends into the sleeve from the second end of the sleeve and is connected to the movable part, the other end of the pull rod is provided with a limiting part, and the pull rod is provided with a second air channel which is communicated with the first air channel and penetrates through the limiting part; the first elastic sealing ring sleeves the pull rod and is positioned between the limiting part and the end surface of the second end of the sleeve; the elastic piece is arranged between the sleeve and the movable piece and used for providing elastic force for driving the movable piece to move towards the first end of the sleeve; the first transmission part acts on the movable part and is used for being externally connected with driving force so as to drive the movable part to move towards the second end of the sleeve. According to the structure, the problem that the supporting cup is damaged during leakage detection is solved, and meanwhile, the sealing effect of the supporting cup during leakage detection is improved.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery processing, and particularly relates to a sealing device for leak detection and a leak detection system. Background Art

[0002] During the service life of cylindrical lithium batteries, there is a problem of electrolyte leakage. The leaked electrolyte will damage related electronic components and cause environmental pollution. Therefore, during the production and processing of cylindrical lithium batteries, it is necessary to detect the leakage of the cups of lithium batteries to ensure the sealing performance of the cups of lithium batteries, which is beneficial to preventing electrolyte leakage.

[0003] In the related art, when detecting the leakage of the cups of lithium batteries, linear drive structures such as air cylinders and electric cylinders are usually used to simultaneously press down multiple sealing devices to block the openings of multiple cups in a tightly fitting manner. Subsequently, a certain amount of gas is filled into the cups or a vacuum is drawn inside the cups. Finally, the pressure change inside the cups is detected by a pressure sensor within a preset time to confirm whether there is a leakage risk in the cups. However, when using the above sealing method, due to the simultaneous pressing down of multiple sealing devices by a linear drive structure, there is an uneven force distribution. Some sealing devices receive a larger driving force, which may damage the cups, while some sealing devices receive a smaller driving force, resulting in poor sealing effect at the openings of the cups, thereby affecting the detection results. In addition, when using the above sealing method, a larger driving force is required, the driving cost is relatively high, and when gas is filled into the cups, a force acting on the linear drive structure is generated, which requires a certain structural strength for the frame of the linear drive structure, further increasing the driving cost. Summary of the Utility Model

[0004] This application aims to at least solve one of the technical problems existing in the prior art. For this purpose, this application proposes a sealing device for leak detection, which is beneficial to reducing the problem of damage to the cups during leak detection and at the same time is beneficial to improving the sealing effect of the cups during leak detection.

[0005] This application also proposes a leak detection system having the above-mentioned sealing device for leak detection.

[0006] A leak detection sealing device according to an embodiment of the first aspect of the present application includes: a sleeve having a first end and a second end disposed opposite to each other; a movable member movably disposed within the sleeve, the movable member being provided with a first air passage for externally connecting a pipeline; a pull rod, one end of the pull rod extending into the sleeve from the second end of the sleeve and connected to the movable member, the other end of the pull rod being provided with a limiting portion, and the pull rod being provided with a second air passage communicating with the first air passage and passing through the limiting portion; a first elastic sealing ring sleeved on the pull rod and located between the limiting portion and the end face of the second end of the sleeve; an elastic member disposed between the sleeve and the movable member, the elastic member being configured to provide an elastic force for driving the movable member to move towards the first end of the sleeve; and a first transmission member acting on the movable member, the first transmission member being configured to externally connect a driving force to drive the movable member to move towards the second end of the sleeve.

[0007] The leak detection sealing device according to an embodiment of the present application has at least the following beneficial effects: When performing leak detection, the second end of the sleeve is driven to extend into the opening of the cup so that the first elastic sealing ring is located within the opening of the cup. Subsequently, the externally connected driving force of the first transmission member is removed, enabling the elastic member to release the elastic force to drive the movable member towards the first end of the sleeve, thereby causing the first elastic sealing ring to be elastically deformed under the extrusion of the limiting portion. The outer diameter of the first elastic sealing ring after elastic deformation increases, and then the outer side of the first elastic sealing ring abuts against the inner wall of the cup to block the opening of the cup. At this time, operations such as inflation or vacuum pumping are performed through the first air passage and the second air passage, and finally, the pressure change within the cup is detected by a pressure sensor within a preset time to confirm whether there is a leak risk in the cup. After the leak detection is completed, an external driving force is applied through the first transmission member to drive the movable member towards the second end of the sleeve, thereby relieving the extrusion of the limiting portion on the first elastic sealing ring, and then the first elastic sealing ring returns to its original state and the blockage is released. Finally, the leak detection sealing device is driven to separate from the cup. Compared with the prior art, there is no problem of damaging the cup due to a large driving force, nor is there a problem of poor sealing due to a small driving force. Therefore, when using the leak detection sealing device according to an embodiment of the present application for leak detection, it is beneficial to reduce the problem of damage to the cup during leak detection and at the same time beneficial to improve the sealing effect of the cup during leak detection.

[0008] According to some embodiments of the present application, the first transmission member is rod-shaped, the first transmission member is pivotally connected to the first end of the sleeve, the first transmission member has a proximal end for acting on the movable member and a distal end for externally connecting a driving force, the rotation center of the first transmission member is located between the proximal end of the first transmission member and the distal end of the first transmission member, and the distance from the proximal end of the first transmission member to the rotation center of the first transmission member is less than the distance from the distal end of the first transmission member to the rotation center of the first transmission member.

[0009] According to some embodiments of the present application, a cam follower is provided at the distal end of the first transmission member.

[0010] According to some embodiments of the present application, the elastic member is a compression spring, a first abutting portion corresponding to the compression spring is provided in the sleeve, a second abutting portion corresponding to the compression spring is provided on the movable member, the first abutting portion is closer to the second end of the sleeve than the second abutting portion, the compression spring is located in the sleeve and sleeved outside the pull rod, one end of the compression spring abuts against the first abutting portion, and the other end of the compression spring abuts against the second abutting portion.

[0011] According to some embodiments of the present application, the pull rod is detachably connected to the movable member.

[0012] According to some embodiments of the present application, a threaded connection hole communicating with the first air passage is provided on the movable member, a threaded connection portion is provided at one end of the pull rod away from the limiting portion, the threaded connection portion is threadedly connected to the threaded connection hole, and the second air passage penetrates through the threaded connection portion.

[0013] According to some embodiments of the present application, a plug hole communicating with the threaded connection hole is provided on the movable member, one end of the pull rod provided with the threaded connection portion is inserted into the plug hole, and a second elastic sealing ring is sleeved on the portion of the pull rod located in the plug hole.

[0014] According to some embodiments of the present application, a connecting member is provided on the outer side wall of the sleeve, and the connecting member is used to be connected to an external lifting mechanism.

[0015] According to some embodiments of the present application, a rotary elbow communicating with the first air passage is provided on the movable member.

[0016] The leak detection system according to the second aspect embodiment of the present application includes a sealing device for leak detection according to the first aspect embodiment of the present application above.

[0017] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:

[0019] Figure 1 is a schematic structural diagram of a sealing device for leak detection according to an embodiment of the present application;

[0020] Figure 2 is a schematic cross-sectional view of a sealing device for leak detection according to an embodiment of the present application;

[0021] Figure 3 is a schematic view of the state when the sealing device for leak detection according to an embodiment of the present application extends into the cup.

[0022] Reference numerals:

[0023] cup a, sleeve 100, first abutting portion 110, connecting member 120, movable member 200, first air passage 210, second abutting portion 220, pull rod 300, limiting portion 310, second air passage 320, threaded connection portion 330, first elastic sealing ring 400, first transmission member 500, cam follower 600, compression spring 700, second elastic sealing ring 800, rotary elbow 900. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0025] In the description of the present application, it should be understood that if orientation descriptions are involved, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0026] In the description of the present application, if words such as several, greater than, less than, exceeding, above, below, within, etc. appear, where the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number.

[0027] In the description of the present application, if terms such as first and second appear, they are only used for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features or the sequence of the indicated technical features.

[0028] In the description of the present application, unless otherwise clearly defined, terms such as set, install, connect, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0029] Referring to Figures 1 to 3 , the leak detection sealing device according to an embodiment of the present application includes a sleeve 100, a movable member 200, a pull rod 300, a first elastic sealing ring 400, an elastic member, and a first transmission member 500.

[0030] Specifically, the sleeve 100 has a first end and a second end arranged opposite to each other. The movable member 200 is movably arranged in the sleeve 100. A first air passage 210 for connecting an external pipeline is arranged on the movable member 200. One end of the pull rod 300 extends into the sleeve 100 from the second end of the sleeve 100 and is connected to the movable member 200. The other end of the pull rod 300 is provided with a limiting portion 310. A second air passage 320 that communicates with the first air passage 210 and penetrates through the limiting portion 310 is arranged on the pull rod 300. The first elastic sealing ring 400 is sleeved on the pull rod 300 and is located between the limiting portion 310 and the end face of the second end of the sleeve 100. The elastic member is arranged between the sleeve 100 and the movable member 200. The elastic member is used to provide an elastic force for driving the movable member 200 to move towards the first end of the sleeve 100. The first transmission member 500 acts on the movable member 200. The first transmission member 500 is used to connect an external driving force to drive the movable member 200 to move towards the second end of the sleeve 100.

[0031] When performing leak detection, the second end of the sleeve 100 is driven to extend into the opening of the cup a, so that the first elastic sealing ring 400 is located within the opening of the cup a. Subsequently, the driving force externally connected to the first transmission member 500 is removed, enabling the elastic member to release elastic force to drive the movable member 200 to move towards the first end of the sleeve 100. As a result, the first elastic sealing ring 400 is squeezed by the limiting portion 310 and undergoes elastic deformation. The outer diameter of the first elastic sealing ring 400 after elastic deformation increases, further causing the outer side of the first elastic sealing ring 400 to abut against the inner wall of the cup a to seal the opening of the cup a. At this time, inflation or vacuum pumping operations are performed through the first air passage 210 and the second air passage 320. Finally, the pressure change within the cup a is detected by the pressure sensor within a preset time to confirm whether there is a leakage risk in the cup a. After completing the leak detection, an external driving force is applied through the first transmission member 500 to drive the movable member 200 to move towards the second end of the sleeve 100, thereby relieving the extrusion of the limiting portion 310 on the first elastic sealing ring 400. As a result, the first elastic sealing ring 400 returns to its original state and the sealing is released. Finally, the sealing device for leak detection is driven to separate from the cup a. Compared with the prior art, there is no problem of crushing the cup a due to a large driving force, nor is there a problem of poor sealing due to a small driving force. Therefore, when using the sealing device for leak detection according to the embodiment of the present application for leak detection, it is beneficial to reduce the problem of damage to the cup a during leak detection, and at the same time, it is beneficial to improve the sealing effect of the cup a during leak detection.

[0032] Specifically, the driving force can be manually provided to the first transmission member 500, or the driving force can be provided to the first transmission member 500 through a linear driving structure such as a cylinder or an electric cylinder, which is not limited herein.

[0033] When detecting leaks by inflating the cup a, the frictional force between the first elastic sealing ring 400 and the inner wall of the cup a can absorb the pressure generated when inflating the cup a with gas. When the driving force externally connected to the first transmission member 500 is provided by a linear driving structure such as a cylinder or an electric cylinder, the pressure generated when inflating the cup a with gas will not act on the linear driving structure, which is beneficial to reducing the requirement for the structural strength of the frame of the linear driving structure, thereby facilitating the reduction of the driving cost.

[0034] It should be noted that during use, the sleeve 100 can be manually driven to move, so as to drive the second end of the sleeve 100 to extend into the opening of the cup a or drive the sealing device for leak detection to separate from the cup a. Of course, the sleeve 100 can also be driven to move through a lifting mechanism connected to the sleeve 100, so as to drive the second end of the sleeve 100 to extend into the opening of the cup a or drive the sealing device for leak detection to separate from the cup a, which is not limited herein.

[0035] It should be noted that in some of the embodiments, the first elastic sealing ring 400 is an O-ring, that is, a sealing ring with a circular cross-section.

[0036] Referring to Figures 1 to 3 , in some of the embodiments, the first transmission member 500 is rod-shaped. The first transmission member 500 is pivotally connected to the first end of the sleeve 100. The first transmission member 500 has a proximal end for acting on the movable member 200 and a distal end for externally connecting a driving force. The rotation center of the first transmission member 500 is located between the proximal end and the distal end of the first transmission member 500. The distance from the proximal end of the first transmission member 500 to the rotation center of the first transmission member 500 is less than the distance from the distal end of the first transmission member 500 to the rotation center of the first transmission member 500. When the first transmission member 500 drives the movable member 200 to move towards the second end of the sleeve 100, since the distance from the proximal end of the first transmission member 500 to the rotation center of the first transmission member 500 is less than the distance from the distal end of the first transmission member 500 to the rotation center of the first transmission member 500, a lever structure is formed, which has the effect of saving effort. When manually providing a driving force to the first transmission member 500, it is beneficial to reduce the labor intensity of the operator. When the driving force externally connected to the first transmission member 500 is provided by a linear driving structure such as a cylinder or an electric cylinder, it is beneficial to reduce the driving cost.

[0037] Referring to Figure 1 , in some of the embodiments, a cam follower 600 is provided at the distal end of the first transmission member 500. The cam follower 600 is used to cooperate with the guide groove to drive the first transmission member 500 to rotate. Specifically, a second transmission member can be provided at the output end of a linear driving structure such as a cylinder or an electric cylinder, and a plurality of guide grooves for cooperating with the cam follower 600 are provided on the second transmission member, so that the linear driving structure only needs to provide one driving force to drive a plurality of first transmission members 500 to rotate. That is to say, the linear driving structure only needs to provide one driving force to drive a plurality of leak detection sealing devices to synchronously block or release the opening of the plugging cup a, thereby realizing a one-to-many driving mode. Among them, the cam follower is a well-known technology, and its specific structure and working principle will not be elaborated here.

[0038] Among them, the opening of the plugging cup a is sealed by the elastic force provided by the elastic member, and its sealing effect is not affected by the magnitude of the driving force of the linear driving structure. Therefore, when adopting a one-to-many driving mode, the sealing effects between a plurality of leak detection sealing devices do not affect each other.

[0039] Referring to Figure 2 and Figure 3, in some of these embodiments, the elastic member is a compression spring 700. A first abutting portion 110 corresponding to the compression spring 700 is provided in the sleeve 100, and a second abutting portion 220 corresponding to the compression spring 700 is provided on the movable member 200. The first abutting portion 110 is closer to the second end of the sleeve 100 than the second abutting portion 220. The compression spring 700 is located in the sleeve 100 and sleeved outside the pull rod 300. One end of the compression spring 700 abuts against the first abutting portion 110, and the other end of the compression spring 700 abuts against the second abutting portion 220. Its structure is simple and easy to implement.

[0040] It should be noted that, in some other embodiments, the elastic member can also be a tension spring provided between the sleeve 100 and the movable member 200, which is not limited herein.

[0041] It should be noted that, in some of these embodiments, the pull rod 300 is detachably connected to the movable member 200 to facilitate the replacement of the first elastic sealing ring 400.

[0042] Refer to Figure 2 and Figure 3 , in some of these embodiments, a threaded connection hole communicating with the first air passage 210 is provided on the movable member 200. One end of the pull rod 300 away from the limiting portion 310 is provided with a threaded connection portion 330. The threaded connection portion 330 is threadedly connected to the threaded connection hole. The second air passage 320 penetrates through the threaded connection portion 330. Its structure is simple and convenient for the installation and disassembly of the pull rod 300.

[0043] Refer to Figure 2 and Figure 3 , in some of these embodiments, a plug hole communicating with the threaded connection hole is provided on the movable member 200. One end of the pull rod 300 provided with the threaded connection portion 330 is inserted into the plug hole. A second elastic sealing ring 800 is sleeved on the portion of the pull rod 300 located in the plug hole, which is beneficial to improving the sealing performance at the connection between the movable member 200 and the pull rod 300, that is, beneficial to improving the sealing performance at the connection between the first air passage 210 and the second air passage 320.

[0044] It should be noted that, in some other embodiments, the above-mentioned threaded connection hole can also be provided at one end of the pull rod 300 away from the limiting portion 310 and communicate with the second air passage 320, which is not limited herein. At this time, the threaded connection portion 330 is provided on the movable member 200, and the first air passage 210 penetrates through the threaded connection portion 330.

[0045] When the above-mentioned threaded connection hole is provided at one end of the pull rod 300 away from the limiting portion 310, the above-mentioned insertion hole is also provided at one end of the pull rod 300 away from the limiting portion 310. Specifically, one end of the movable member 200 provided with the threaded connection portion 330 is inserted into the insertion hole, and the second elastic sealing ring 800 is sleeved on the portion of the movable member 200 located in the insertion hole.

[0046] Referring to Figures 1 to 3 , in some embodiments, a connecting member 120 is provided on the outer side wall of the sleeve 100. The connecting member 120 is used to connect with an external lifting mechanism. During use, it cooperates with a linear driving structure that can provide a driving force to the first transmission member 500, so as to realize the automation of the leak detection process.

[0047] It should be noted that, in some embodiments, the connecting member 120 is integrally formed with the sleeve 100.

[0048] It should be noted that, in some other embodiments, the connecting member 120 can also be independent of the sleeve 100, which is not limited herein. Specifically, the connecting member 120 can be fixed to the outside of the sleeve 100 by a clamping method, similar to a hoop, or can be connected to the sleeve 100 through a snap structure or a threaded connection structure, and can also be connected to the sleeve 100 through fasteners such as screws and pins, which is not limited herein.

[0049] Referring to Figures 1 to 3 , in some embodiments, a rotary elbow 900 communicating with the first air duct 210 is provided on the movable member 200 for connecting a pipeline for inflation or vacuum extraction. During use, the rotary elbow 900 can rotate to different orientations to adapt to different pipeline connection requirements, which is beneficial to reducing the difficulty of pipeline layout. Among them, the rotary elbow is a well-known technology, and its specific structure and working principle will not be elaborated herein.

[0050] The leak detection system according to the embodiment of the present application includes the above-mentioned sealing device for leak detection.

[0051] In the description of this specification, if descriptions of reference terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", and "some examples" are involved, it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0052] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A sealing device for leak detection, characterized in that, Comprising: A sleeve having a first end and a second end disposed opposite to each other; A movable member movably disposed within the sleeve, and a first air passage for externally connecting a pipeline is provided on the movable member; A pull rod, one end of the pull rod extends into the sleeve from the second end of the sleeve and is connected to the movable member, a limiting portion is provided at the other end of the pull rod, and a second air passage communicating with the first air passage and passing through the limiting portion is provided on the pull rod; A first elastic sealing ring sleeved on the pull rod and located between the limiting portion and the end face of the second end of the sleeve; An elastic member disposed between the sleeve and the movable member, and the elastic member is used to provide an elastic force for driving the movable member to move towards the first end of the sleeve; A first transmission member acting on the movable member, and the first transmission member is used to externally connect a driving force to drive the movable member to move towards the second end of the sleeve.

2. The leak detection sealing device according to claim 1, characterized in that, The first transmission member is rod-shaped, the first transmission member is pivotally connected to the first end of the sleeve, the first transmission member has a proximal end for acting on the movable member and a distal end for externally connecting a driving force, the rotation center of the first transmission member is located between the proximal end of the first transmission member and the distal end of the first transmission member, and the distance from the proximal end of the first transmission member to the rotation center of the first transmission member is less than the distance from the distal end of the first transmission member to the rotation center of the first transmission member.

3. The leak detection sealing device according to claim 2, characterized in that, A cam follower is provided at the distal end of the first transmission member.

4. The leak detection sealing device according to claim 1, characterized in that, The elastic member is a compression spring, a first abutting portion corresponding to the compression spring is provided within the sleeve, a second abutting portion corresponding to the compression spring is provided on the movable member, the first abutting portion is closer to the second end of the sleeve than the second abutting portion, the compression spring is located within the sleeve and sleeved outside the pull rod, one end of the compression spring abuts against the first abutting portion, and the other end of the compression spring abuts against the second abutting portion.

5. The leak detection sealing device according to claim 1, characterized in that, The pull rod is detachably connected to the movable member.

6. The leak detection sealing device according to claim 5, characterized in that, A threaded connection hole communicating with the first air passage is provided on the movable member, a threaded connection portion is provided at the end of the pull rod away from the limiting portion, the threaded connection portion is threadedly connected to the threaded connection hole, and the second air passage passes through the threaded connection portion.

7. The leak detection sealing device according to claim 6, characterized in that, A plug hole communicating with the threaded connection hole is provided on the movable member, one end of the pull rod provided with the threaded connection portion is inserted into the plug hole, and a second elastic sealing ring is sleeved on the portion of the pull rod located within the plug hole.

8. The leak detection sealing device according to claim 1, characterized in that, A connecting member is provided on the outer side wall of the sleeve, and the connecting member is used to be connected to an external lifting mechanism.

9. The leak detection sealing device according to claim 1, characterized in that, A swivel elbow communicating with the first air passage is provided on the movable member.

10. A leak detection system, characterized in that, Comprising the sealing device for leak detection according to any one of claims 1 to 9.

Images