Molecular pump mounting structure and gas leak detection device

Abstract

The utility model relates to a molecular pump mounting structure and a gas leak detection device, which comprise fasteners and a central sealing ring, and a plurality of fasteners are uniformly distributed on a molecular pump interface and a mass spectrometer interface along the radial direction; the fastening piece comprises an upper clamping head, a lower clamping head and a compressing assembly, the upper clamping head and the lower clamping head clamp the molecular pump interface and the mass spectrometer interface through the compressing assembly, the compressing assembly comprises a screw and fastening nuts, the screw is sleeved with the upper clamping head and the lower clamping head, the fastening nuts are connected to the two ends of the screw through threads, and the fastening nuts are connected to the two ends of the screw through threads. The fastening nut is used for pressing the upper clamping head and the lower clamping head. According to the utility model, the fasteners are uniformly arranged on the outer sides of the molecular pump interface and the mass spectrometer interface, and thread adjustment is carried out through the fastening nuts, so that the fastening nuts at the two ends of the screw rod apply acting force to the upper clamping head and the lower clamping head, and the two ends of the fasteners are subjected to pressure adjustment and stress; and the molecular pump interface and the mass spectrometer interface are tightly connected.

Description

Technical Field

[0001] The utility model relates to the technical field of gas leakage detection, in particular to a molecular pump installation structure and a gas leakage detection device. Background Art

[0002] Lithium batteries are rechargeable batteries that use lithium ions as working materials. They are an important power source for new energy vehicles, mobile phones, laptops and other products that require electrical energy.

[0003] Sealing is a critical parameter for lithium-ion batteries, directly impacting their safety and performance. Poorly sealed lithium-ion batteries can lead to electrolyte leakage, potentially causing fires, explosions, and other safety hazards. Furthermore, poor sealing can shorten the battery's lifespan, degrade performance, and even cause it to malfunction.

[0004] Gas testing and helium testing are common methods for testing the airtightness of lithium batteries, with high accuracy and sensitivity. An airtightness tester is used to test the airtightness of the battery casing, while a helium mass spectrometer leak detector uses helium to check the airtightness of the battery's internal structure.

[0005] The molecular pump and the mass spectrometer are connected through an exhaust interface. In order to enable the molecular pump to exhaust gas in the mass spectrometer to form a high vacuum state and realize deionization and analysis of the sample in the mass spectrometer, it is necessary to tighten and seal it by setting fastening bolts. However, since the molecular pump will continue to vibrate during the exhaust process, the position of the exhaust interface at the connection between the molecular pump and the mass spectrometer will be offset or gapped due to vibration. After tightening the conventional fastening bolts, the connection will fail under the action of vibration, thereby affecting the tightness between the molecular pump and the mass spectrometer, making it difficult to form a vacuum state in the mass spectrometer. Utility Model Content

[0006] The first aspect of the present invention aims to solve the technical problem that the insufficient sealing performance of the molecular pump makes it difficult to ionize the lithium battery in the vacuum space. A molecular pump mounting structure is provided, which can make the installation position of the molecular pump interface and the mass spectrometer interface more closely by providing a fastener to enhance the sealing. The main concept is:

[0007] A molecular pump installation structure includes a molecular pump interface and a mass spectrometer interface, which are connected to the mass spectrometer interface, and also includes a fastener and a center sealing ring. The center sealing ring is used to be arranged between the molecular pump interface and the mass spectrometer interface for sealing compensation. The fastener is used to fasten the molecular pump interface and the mass spectrometer interface toward the center sealing ring. The molecular pump interface and the mass spectrometer interface are evenly distributed with multiple fasteners along the radial direction; the fastener includes an upper clamping head, a lower clamping head and a tightening assembly, the upper clamping head and the lower clamping head clamp the molecular pump interface and the mass spectrometer interface through the tightening assembly, the tightening assembly includes a screw and a fastening nut, the upper clamping head and the lower clamping head are sleeved on the screw, the fastening nut is connected to both ends of the screw by threads, and the fastening nut is used to press the upper clamping head and the lower clamping head. This solution will evenly arrange multiple fasteners at the connection position of the molecular pump interface and the mass spectrometer interface, and arrange a central sealing ring between the molecular pump interface and the mass spectrometer interface, so that the central sealing ring fills the gap between the molecular pump interface and the mass spectrometer interface, and the fasteners are evenly installed on the outside of the molecular pump interface and the mass spectrometer interface. The thread is adjusted by the fastening nut, so that the fastening nuts at both ends of the screw apply force to the upper clamping head and the lower clamping head, and both ends of the fastener are pressure-adjusted and stressed, so that the connection between the molecular pump interface and the mass spectrometer interface is tight.

[0008] The second aspect of the present invention aims to solve the technical problem that the strength of the molecular pump connection is reduced after the fastener becomes loose, causing the vacuum environment to be destroyed. Furthermore, the upper clamping head includes a pressing head and a pressure regulating member. The upper clamping head is provided with a guide groove, and the pressing head is arranged in the guide groove. The pressure regulating member includes a spring, which is arranged between the pressing head and the bottom of the guide groove. The spring is used to adaptively adjust the pressure of the pressing head. When the loosening of the fastener cannot be discovered in time, the pressing head controlled by the pressure regulating member of the upper clamping head of this solution will re-tighten the gap caused by the loosening of the fastener, and the pressing head will continue to apply pressure to the mass spectrometer connector under the elastic action of the spring.

[0009] Preferably, the pressure regulating member further comprises an adjusting plate and a pressure regulating screw. The adjusting plate is provided with a positioning stepped groove on a side opposite the guide groove, the positioning stepped groove being connected to the pressure regulating screw. The bottom of the guide groove is provided with a threaded hole, and the pressure regulating screw is threadedly connected to the threaded hole. In this solution, an adjusting plate is provided at the bottom of the spring. When the pressing head is pressed against the top of the mass spectrometer interface, the adjusting plate is controlled to slide within the guide groove by the pressure regulating screw. When the adjusting plate moves along the guide groove toward the pressing head, the adjusting plate compresses the spring, further adjusting the elastic strength of the spring.

[0010] Preferably, the surfaces of the molecular pump interface and the mass spectrometer interface are provided with ribs, and the ribs are used to prevent the fasteners from being separated along the radial direction of the molecular pump interface and the mass spectrometer interface.

[0011] The third aspect of the present invention aims to solve the technical problem that the vibration generated during the operation of the molecular pump causes the fasteners to be offset in the installation position, resulting in uneven sealing. Furthermore, it also includes a positioning plate, which is provided with a plurality of positioning grooves along the circumference, and the positioning grooves are matched with the pressing head of the upper clamping head. The pressing head is matched with the positioning groove, and the pressing head is positioned in the positioning groove. When the molecular pump generates vibration during operation, the pressing heads of the plurality of fasteners uniformly arranged on the molecular pump connector and the mass spectrometer interface are limited by the positioning grooves. Even if the positioning plate and the mass spectrometer interface are offset during the vibration process, the plurality of fasteners positioned by the positioning plate can be synchronously offset, and the intervals between the plurality of fasteners remain unchanged, so that the pressure of the plurality of fasteners at the interface is always uniformly stressed.

[0012] Preferably, the positioning plate is an annular structure formed by splicing two semicircular rings, and the positioning plate is mounted on the inner side of the rib of the spectrometer interface. The positioning plate is spliced by the semicircular rings so that the positioning plate can be mounted on both sides of the mass spectrometer interface, which facilitates the disassembly and assembly of the positioning plate.

[0013] The fourth aspect of the present invention aims to resolve the technical problem of misalignment caused by difficulty aligning the molecular pump interface and the mass spectrometer interface. Preferably, the central sealing ring includes a sealing portion and a positioning portion. The sealing portion is an annular structure, and the positioning portion is disposed on the inner side of the sealing portion. Annular ridges are provided at both ends of the positioning portion. The annular ridges are used to coaxially position the inner walls of the molecular pump interface and the mass spectrometer interface.

[0014] Preferably, the positioning portion is an open metal ring, the outer wall of the positioning portion is provided with an annular groove for limiting the position of the sealing portion, and the inner wall of the positioning portion is provided with a tightening groove for accommodating the positioning ring, which is used to support and position the positioning portion after it is expanded. The positioning portion is embedded in a positioning ring that is compatible with the inner walls of the molecular pump interface and the mass spectrometer interface, so that the annular ridge of the positioning portion can be tightly attached to the inner walls of the molecular pump interface and the mass spectrometer interface for positioning, so that the molecular pump interface and the mass spectrometer interface can be coaxially aligned.

[0015] A gas leak detection device comprises a molecular pump installation structure.

[0016] The beneficial effects of the present invention are:

[0017] By evenly arranging multiple fasteners at the connection positions of the molecular pump interface and the mass spectrometer interface, and arranging a center sealing ring between the molecular pump interface and the mass spectrometer interface, the center sealing ring fills the gap between the molecular pump interface and the mass spectrometer interface, and the fasteners are evenly installed on the outsides of the molecular pump interface and the mass spectrometer interface. The threads are adjusted by fastening nuts so that the fastening nuts at both ends of the screw apply force to the upper clamping head and the lower clamping head, and both ends of the fastener are pressure-adjusted and stressed, so that the connection between the molecular pump interface and the mass spectrometer interface is tight. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2 This is a schematic structural diagram of the fastener of the present utility model.

[0020] Figure 3 It is a structural schematic diagram of the compacting head of the utility model.

[0021] Figure 4 This is a structural diagram of the central sealing ring of the utility model.

[0022] Figure 5 This is a structural diagram of the positioning plate of the utility model.

[0023] The accompanying drawings include: 1. mass spectrometer interface; 2. molecular pump interface; 3. fastener; 31. upper clamping head; 311. pressing head; 312. guide groove; 313. spring; 314. adjusting plate; 315. positioning step groove; 316. pressure-regulating screw; 32. lower clamping head; 33. pressing assembly; 331. screw; 332. pressing nut; 4. center positioning ring; 41. sealing part; 42. positioning part; 421. annular ridge; 422. annular groove; 423. tightening groove; 424. positioning ring; 5. positioning plate; 51. positioning groove; 6. retaining edge. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, identical numbers in different drawings represent identical or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0025] It should be noted that all actions of obtaining signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0026] In this disclosure, unless otherwise specified, directional terms such as "inner" and "outer" are defined based on the contours of the corresponding components. Terms such as "first" and "second" are used in this disclosure to distinguish one element from another and do not convey order or importance.

[0027] Example 1

[0028] like Figure 1 As shown, a molecular pump installation structure of this embodiment includes a molecular pump interface 2 and a mass spectrometer interface 1, the molecular pump interface 2 is connected to the mass spectrometer interface 1, and also includes a fastener 3 and a center sealing ring 4, the center sealing ring 4 is used to be set between the molecular pump interface 2 and the mass spectrometer interface 1 for sealing compensation, the fastener 3 is used to fasten the molecular pump interface 2 and the mass spectrometer interface 1 toward the center sealing ring 4, and the molecular pump interface and the mass spectrometer interface are evenly distributed along the radial direction. A plurality of fasteners 3; The fastener 3 includes an upper clamping head 31, a lower clamping head 32 and a tightening assembly 33. The upper clamping head 31 and the lower clamping head 32 clamp the molecular pump interface 2 and the mass spectrometer interface 1 through the tightening assembly 32. The tightening assembly 33 includes a screw 331 and a fastening nut 332. The upper clamping head 31 and the lower clamping head 32 are sleeved on the screw 331. The fastening nut 332 is threadedly connected to both ends of the screw 331. The fastening nut 332 is used to tighten the upper clamping head 31 and the lower clamping head 32.

[0029] In this embodiment, multiple fasteners 3 are evenly arranged at the connection position of the molecular pump interface 2 and the mass spectrometer interface 1, and a center sealing ring 4 is arranged between the molecular pump interface 2 and the mass spectrometer interface 1, so that the center sealing ring fills the gap between the molecular pump interface 2 and the mass spectrometer interface 1, and the fasteners 3 are evenly installed on the outside of the molecular pump interface 2 and the mass spectrometer interface 1. The thread is adjusted by the fastening nut 332, so that the fastening nuts 332 at both ends of the screw 331 apply force to the upper clamping head 31 and the lower clamping head 32, and both ends of the fastener 3 are pressure-regulated and stressed, so that the connection between the molecular pump interface 2 and the mass spectrometer interface 1 is tight.

[0030] In this embodiment, the pressing assembly 33 uses a double-headed nut, and the fastening nut 332 adopts a double-nut structure. The double-headed nut can press the upper clamping head 31 and the lower clamping head 32 installed in the screw 331 toward the middle position. The double-nut structure is to set two nuts on one side of the screw 331 to prevent loosening. During installation, the inner nut of the fastening nut 332 is tightened first, and the outer nut is tightened to push against the inner nut.

[0031] In this embodiment, a rubber ring is provided between the positions where the upper clamping head 31 and the lower clamping head 32 are sleeved on the screw 331. The rubber ring is used to prevent the upper clamping head 31 and the lower clamping head 32 from colliding when not in use, thereby causing damage to the fastener 3. The rubber ring can be provided separately between the upper clamping head 31 and the lower clamping head 32, or can be respectively bonded to the opposite sides of the upper clamping head 31 and the lower clamping head 32.

[0032] In this embodiment, the surfaces of the molecular pump interface 2 and the mass spectrometer interface 1 are provided with a rib 6, and the upper clamping head 31 and the lower clamping head 32 are both provided with a buckle for clamping with the rib 6, so that the rib 6 cooperates with the buckle to prevent the fastener 3 from detaching along the radial direction of the molecular pump interface 2 and the mass spectrometer interface 1.

[0033] Example 2

[0034] like Figure 1-Figure 2 As shown, the upper clamping head 31 of this embodiment includes a pressing head 311 and a pressure regulating member. The upper clamping head 311 is provided with a guide groove 312, in which the pressing head 311 is disposed. The pressure regulating member includes a spring 313 disposed between the pressing head 311 and the bottom of the guide groove 312. The spring 313 is used to adaptively adjust the pressure of the pressing head 311. If a loose fastener cannot be detected in time, the pressing head 311, which is controlled by the pressure regulating member of the upper clamping head 311 of this embodiment, re-tightens the gap caused by the loose fastener. Under the elastic action of the spring 313, the pressing head 311 will continue to apply pressure to the mass spectrometer connector.

[0035] The pressure regulating member also includes an adjusting plate 314 and a pressure regulating screw 316. The side of the adjusting plate 314 opposite the guide slot 312 is provided with a positioning stepped groove 315, which is connected to the pressure regulating screw 316. The bottom of the guide slot 312 is provided with a threaded hole 317, and the pressure regulating screw 316 is threadedly connected to the threaded hole 317. In this solution, the adjusting plate 314 is provided at the bottom of the spring 313. When the pressing head 311 is pressed against the top of the mass spectrometer interface, the pressure regulating screw 316 controls the sliding of the adjusting plate 314 within the guide slot 312. After the adjusting plate 314 moves along the guide slot 312 toward the pressing head 311, the adjusting plate 314 compresses the spring, further adjusting the elastic strength of the spring 313.

[0036] The positioning step groove 315 of this embodiment decreases in size along the inner wall of the opening position, and the position where the pressure-regulating screw 316 cooperates with the positioning step groove 315 is also set as a step boss. The step boss is snap-fitted with the positioning step groove 315, so that the adjusting piece 314 and the pressure-regulating screw 316 move synchronously in the axial direction; this embodiment can also be achieved by setting a bearing on the outer wall of the bottom of the step boss and connecting it to the cavity at the bottom of the step boss, so that when the pressure-regulating screw rotates, the adjusting piece will not rotate, but only make axial linear motion.

[0037] Example 3

[0038] like Figure 5 As shown, this embodiment further includes a positioning plate 5, which is provided with a plurality of positioning grooves 51 along the circumferential direction. The positioning grooves 51 cooperate with the pressing head 311 of the upper clamping head 31. The pressing head 311 cooperates with the positioning groove 51 and is positioned in the positioning groove 51. When the molecular pump is running and vibrating, the pressing heads 311 of the plurality of fasteners 3 evenly arranged on the molecular pump connector 1 and the mass spectrometer interface 1 are limited by the positioning groove 51. Even if the positioning plate 5 and the mass spectrometer interface 1 deviate during the vibration process, the plurality of fasteners 3 positioned by the positioning plate 5 can be deviated synchronously. The intervals between the plurality of fasteners 3 remain unchanged, so that the pressure of the plurality of fasteners 3 at the interface is always uniformly stressed.

[0039] The positioning plate 5 is a ring structure formed by splicing two semicircular rings, and the positioning plate 5 is installed on the inner side of the rib 6 of the spectrometer interface 2. The positioning plate 5 is spliced by the semicircular rings so that the positioning plate 5 is installed on the inner side of the rib 6 of the mass spectrometer interface 1, which facilitates the disassembly and assembly of the positioning plate 5.

[0040] Example 4

[0041] like Figure 4 As shown, the central sealing ring 4 in this embodiment includes a sealing portion 41 and a positioning portion 42. The sealing portion 41 is an annular structure. The positioning portion 42 is arranged on the inner side of the sealing portion 41. An annular ridge 421 is provided at both ends of the positioning portion 42. The annular ridge 421 is used to coaxially position the inner walls of the molecular pump interface 2 and the mass spectrometer interface 1.

[0042] The positioning portion 42 is an open metal ring. Its outer wall is provided with an annular groove 422 for limiting the position of the sealing portion 41. Its inner wall is provided with a tensioning groove 423 for accommodating a positioning ring 424, which is used to support and position the positioning portion 42 after it is expanded. The positioning portion 42 is embedded in the positioning ring 424, which is compatible with the inner walls of the molecular pump interface 2 and the mass spectrometer interface 1. This allows the annular ridge 421 of the positioning portion 42 to cling tightly to the inner walls of the molecular pump interface 2 and the mass spectrometer interface 1 for positioning, thereby achieving coaxial alignment between the molecular pump interface 2 and the mass spectrometer interface 1.

[0043] A gas leak detection device comprises a molecular pump installation structure.

[0044] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A molecular pump installation structure, characterized in that: The invention comprises a molecular pump interface (2) and a mass spectrometer interface (1), wherein the molecular pump interface (2) is connected to the mass spectrometer interface (1), and further comprises a fastener (3) and a central sealing ring (4), wherein the central sealing ring (4) is used for providing sealing compensation between the molecular pump interface (2) and the mass spectrometer interface (1), and the fastener (3) is used for fastening the molecular pump interface (2) and the mass spectrometer interface (1) toward the central sealing ring (4), and the molecular pump interface and the mass spectrometer interface are evenly distributed with a plurality of fasteners (3) along the radial direction; the fastener (3) comprises an upper clamping head (3 1), a lower clamping head (32) and a pressing assembly (33), the upper clamping head (31) and the lower clamping head (32) clamp the molecular pump interface (2) and the mass spectrometer interface (1) through the pressing assembly (33), the pressing assembly (33) includes a screw (331) and a fastening nut (332), the upper clamping head (31) and the lower clamping head (32) are sleeved on the screw (331), the fastening nut (332) is connected to both ends of the screw (331) through a thread, and the fastening nut (332) is used to press the upper clamping head (31) and the lower clamping head (32).

2. A molecular pump installation structure according to claim 1, characterized in that: The upper clamping head (31) includes a pressing head (311) and a pressure regulating member. The upper clamping head (31) is provided with a guide groove (312). The pressing head (311) is arranged in the guide groove (312). The pressure regulating member includes a spring (313). The spring (313) is arranged between the pressing head (311) and the bottom of the guide groove (312). The spring (313) is used to adaptively adjust the pressure of the pressing head (311).

3. A molecular pump installation structure according to claim 2, characterized in that: The pressure regulating member further comprises a regulating plate (314) and a pressure regulating screw (316); a positioning stepped groove (315) is provided on a side of the regulating plate (314) opposite to the guide groove (312); the positioning stepped groove (315) is connected to the pressure regulating screw (316); a threaded hole (317) is provided at the bottom of the guide groove (312); the pressure regulating screw (316) is threadedly connected to the threaded hole (317).

4. The molecular pump installation structure according to claim 1, characterized in that: The surfaces of the molecular pump interface (2) and the mass spectrometer interface (1) are provided with ribs (6), and the ribs (6) are used to prevent the fastener (3) from being disengaged along the radial direction of the molecular pump interface (2) and the mass spectrometer interface (1).

5. The molecular pump installation structure according to claim 1, characterized in that: It also includes a positioning plate (5), the positioning plate (5) is provided with a plurality of positioning grooves (51) along the circumference, and the positioning grooves (51) cooperate with the pressing head (311) of the upper clamping head (31).

6. A molecular pump installation structure according to claim 5, characterized in that: The positioning plate (5) is a ring structure formed by splicing two semicircular rings, and the positioning plate (5) is mounted on the inner side of the retaining edge (6) of the mass spectrometer interface (1).

7. The molecular pump installation structure according to claim 1, characterized in that: The central sealing ring (4) comprises a sealing portion (41) and a positioning portion (42), wherein the sealing portion (41) is an annular structure, and the positioning portion (42) is arranged on the inner side of the sealing portion (41), and annular convex strips (421) are provided at both ends of the positioning portion (42), and the annular convex strips (421) are used to coaxially position the inner walls of the molecular pump interface (2) and the mass spectrometer interface (1).

8. The molecular pump installation structure according to claim 7, characterized in that: The positioning portion (42) is an open metal ring. The outer wall of the positioning portion (42) is provided with an annular groove (422) for limiting the sealing portion (41). The inner wall of the positioning portion (42) is provided with a tightening groove (423). The tightening groove (423) is used to accommodate a positioning ring (424). The positioning ring (424) is used to support and position the positioning portion (42) after it is expanded.

9. A gas leak detection device, characterized in that: It comprises the molecular pump installation structure according to any one of claims 1-8.

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