CN114001878A

CN114001878A - Gas filtering mechanism for helium mass spectrometer leak detector

Info

Publication number: CN114001878A
Application number: CN202111301539.7A
Authority: CN
Inventors: 冉振为; 洪荣丰; 曹大阳; 郭炳汉; 汪浩; 杨效
Original assignee: Shenzhen Walsheng Intelligent Control Technology Co ltd
Current assignee: Shenzhen Walsheng Intelligent Control Technology Co ltd
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-02-01

Abstract

The invention discloses a gas filtering mechanism for a helium mass spectrometer leak detector, and relates to the technical field of helium mass spectrometer leak detector equipment. The gas filtering mechanism for the helium mass spectrometer leak detector comprises a machine body and a leak detecting pipe, wherein the leak detecting pipe is installed at the input end of the top of the machine body, a filtering component is inserted into the top of the leak detecting pipe and used for filtering gas flowing into the machine body and preventing dirt from damaging precision parts inside the machine body, a supporting component is arranged on the bottom surface of the filtering component, the bottom surface of the supporting component is connected with the top surface of the machine body, and the supporting component is used for supporting and supporting the filtering component.

Description

Gas filtering mechanism for helium mass spectrometer leak detector

Technical Field

The invention relates to the technical field of helium mass spectrometer leak detector equipment, in particular to a gas filtering mechanism for a helium mass spectrometer leak detector.

Background

Helium mass spectrometer leak detectors are the term of gas industry, mass spectrometers that leak are tested using helium or hydrogen as the leak indicator gas and a gas analyzer to detect helium. The helium has low background noise and small molecular weight and viscosity coefficient, so the helium is easy to pass through the leak hole and diffuse; in addition, since helium is an inert gas and does not corrode equipment, helium is often used as a leak gas. The gas is sprayed to a detected container connected with a gas analyzer (adjusted to a working state only reacting to helium gas), if the container has a leak hole, the analyzer reacts, and the position of the leak hole and the size of the leak gas can be known.

When the existing helium mass spectrometer leak detector is used, the gas sucked into the helium mass spectrometer leak detector cannot be filtered, so that dirt in the gas is easily sucked into the helium mass spectrometer leak detector together, and then precision parts in the helium mass spectrometer leak detector are damaged.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a gas filtering mechanism for a helium mass spectrometer leak detector, which solves the problems that gas flowing into a machine body can be filtered, so that the damage of dirt in the gas to precision parts in the helium mass spectrometer leak detector can be prevented, the sucked gas can be pressurized, and further, the gas leakage detection treatment can be performed on a large object by equipment, so that the use flexibility of the equipment is improved.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a gas filtering mechanism for helium mass spectrometer leak detector, includes the organism and examines the leak hunting pipe, the leak hunting pipe is installed to organism top input, it has filtering component to examine the grafting in leak hunting pipe top, filtering component is used for filtering the gas that flows into to the organism, prevents that the inside precision parts of organism from being damaged to the filth, filtering component bottom surface is equipped with supporting component to supporting component bottom surface links to each other with organism top surface, supporting component is used for supporting the support to filtering component, reaches the stable function when filtering component uses, the filtering component surface leans on the lower position to install control assembly, control assembly is used for controlling the effect of the inside equipment operation of filtering component.

Further, filtering component includes pipe, bottom, outlet duct, top cap, intake pipe, pipe bottom and top rotate respectively and are connected with bottom and top cap, bottom middle part integrated into one piece has the outlet duct, top cap top middle part integrated into one piece has the intake pipe, pipe mid-mounting has the retaining ring to retaining ring top surface welding has the division board, and division board top surface is equipped with the packing ring simultaneously, packing ring top surface mounting has first spacing frame to first spacing frame top surface is equipped with the spacing frame of second, and the spacing frame top surface of second is equipped with the spacing frame of third simultaneously, synthetic fibrofelt, glass fiber filter pulp and non-woven fabrics filter pulp are installed respectively to first spacing frame, the spacing frame of second and the spacing frame inner chamber of third.

Furthermore, locking caps are welded at the top end of the air outlet pipe and the bottom end of the air inlet pipe, and the locking caps are used for rotatably opening the bottom cover and the top cover.

Further, first groove ring has all been seted up at first spacing frame, the spacing frame of second and the spacing frame outer wall surface middle part of third to first sealing washer is installed to first groove ring inner chamber.

Furthermore, the bottom surfaces and the top surfaces of the first limiting frame, the second limiting frame and the third limiting frame are respectively provided with a tenon and a mortise, the tenons and the tenons are respectively provided with a plurality of groups, and meanwhile, each group of the tenons and each group of the tenons are in one-to-one correspondence and connected in an inserting manner.

Furthermore, a sliding groove is arranged in the middle of the bottom surface of the top cover, a pressing plate is arranged below the sliding groove, and the top surface of the pressing plate is movably connected with the sliding groove through a vertical rod.

Further, division board bottom surface intermediate position is inlayed and is connected with the conveyer pipe to miniature air pump is installed to the conveyer pipe bottom, and the blast pipe is installed to miniature air pump output simultaneously, miniature air pump bottom links to each other bottom the pipe lateral wall through the mount, bottom top fixed surface is connected with the spacing collar to the draw-in groove has been seted up at spacing collar inner chamber middle part, and the second sealing washer is installed to the draw-in groove inner chamber simultaneously, the second sealing washer links to each other with the grafting of blast pipe bottom, pipe lateral wall bottom is inlayed and is connected with the spool.

Furthermore, the top surface and the bottom surface of the guide pipe are provided with second groove rings close to the edge positions, the inner cavity of each second groove ring is provided with a third sealing ring, convex rings are integrally formed on the top surface of the bottom cover and the bottom surface of the top cover close to the edge positions, and the convex rings are connected with the second groove rings in an inserting mode.

Further, the support assembly includes a base, the base top surface is connected to the bracket by a plurality of sets of struts, and the bracket top surface is attached to the filter assembly bottom surface.

Further, the control assembly comprises a fixing sheet, and a switch, an indicator light and a junction box are mounted on the surface of the fixing sheet.

(III) advantageous effects

The invention has the following beneficial effects:

(1) this a gas filtering mechanism for helium mass spectrometer leak detector, through each group's spacing frame in the rotatory filtering component, can install corresponding synthetic fiber felt respectively, glass fiber filter pulp and non-woven fabrics filter pulp, thereby can make synthetic fiber felt, glass fiber filter pulp and non-woven fabrics filter pulp carry out multiple filtration to the gas of flowing through, and then can fully filter the filth in the gas, so that can prevent that the filth in the gas from following in the gas flows into the organism, the life and the safety of organism internals have been guaranteed.

(2) This a gas filtering mechanism for helium mass spectrometer leak detector through retaining ring and division board, can play the packing ring supporting role, can separate two cabins about can separating to the pipe inner chamber again, and then can install different equipment, then through the packing ring, can play the supporting role to each spacing frame of group, through spout and pole setting, can be to the spacing installation of clamp plate to can hold spacing effect to the spacing frame pressure of third, and then can prevent that each spacing frame of group from rocking from top to bottom.

(3) This a gas filtering mechanism for helium mass spectrometer leak detector, conveyer pipe through among the rotatory filtering component, can be with the gaseous transport to miniature air pump after the division board top cabin filters, then miniature air pump, can carry out the pressure boost processing to the gas of circulation, pass through blast pipe and spacing collar after that, can be with the gaseous transport to the outlet duct after the pressure boost in, and then carry to the organism in, so that equipment can carry out gas leakage detection to big article and handle, draw-in groove and second sealing washer through the spacing collar, can play the spacing installation effect to the blast pipe, can prevent again that blast pipe and spacing collar grafting department from leaking gas.

(4) This a gas filtering mechanism for helium mass spectrometer leak detector through supporting component, can hold up filtering component, and then can improve the stability that filtering component used to through the switch in the control assembly, opening or closing miniature air pump operation that again can be nimble, then the pilot lamp makes things convenient for the staff again to look over the state of miniature air pump operation from the outside.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic view of the filter assembly of the present invention;

FIG. 4 is a schematic cross-sectional view of a filter assembly according to the present invention;

FIG. 5 is an exploded view of the first stop block according to the present invention;

FIG. 6 is a schematic view of the top cover structure of the present invention;

FIG. 7 is a schematic view of the bottom cover structure of the present invention;

FIG. 8 is a schematic view of a support assembly according to the present invention;

FIG. 9 is a schematic structural diagram of a control assembly according to the present invention.

In the figure, 1, a machine body; 2. a leakage detecting pipe; 3. a filter assembly; 301. a conduit; 302. a bottom cover; 303. an air outlet pipe; 304. a top cover; 305. an air inlet pipe; 306. a locking cap; 307. a retainer ring; 308. a partition plate; 309. a gasket; 310. a first limit frame; 311. a second limit frame; 312. a third limit frame; 313. a synthetic fiber mat; 314. glass fiber filter cotton; 315. non-woven fabric filter cotton; 316. a first groove ring; 317. a first seal ring; 318. a mortise and tenon; 319. a tenon; 320. a chute; 321. pressing a plate; 322. erecting a rod; 323. a delivery pipe; 324. a micro air pump; 325. an exhaust pipe; 326. a limiting ring; 327. a second seal ring; 328. a second groove ring; 329. a convex ring; 330. a conduit; 4. a support assembly; 401. a base; 402. a bracket; 403. a strut; 5. a control component; 501. a fixing sheet; 502. a switch; 503. an indicator light; 504. a junction box.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Referring to fig. 1 to fig. 9, an embodiment of the present invention provides a technical solution: a gas filtering mechanism for a helium mass spectrometer leak detector comprises a machine body 1 and a leak detecting pipe 2, wherein the leak detecting pipe 2 is installed at the input end of the top of the machine body 1, a filtering component 3 is inserted into the top of the leak detecting pipe 2, gas flowing into the machine body 1 can be filtered through the filtering component 3, so that the damage to precision parts inside the machine body 1 caused by dirt in the gas can be prevented, the use safety of the machine body 1 can be further protected, a supporting component 4 is arranged on the bottom surface of the filtering component 3, the bottom surface of the supporting component 4 is connected with the top surface of the machine body 1, the filtering component 3 can be supported through the supporting component 4, the stability of the filtering component 3 in use can be improved, a control component 5 is installed on the surface of the filtering component 3 close to the lower position, the operation of equipment inside the filtering component 3 can be flexibly controlled through the control component 5, thereby facilitating the operation and use of users.

Specifically, the filter assembly 3 comprises a guide pipe 301, a bottom cover 302, an outlet pipe 303, a top cover 304, an inlet pipe 305, the bottom end and the top end of the conduit 301 are respectively rotatably connected with a bottom cover 302 and a top cover 304, an air outlet pipe 303 is integrally formed in the middle of the bottom end of the bottom cover 302, an air inlet pipe 305 is integrally formed in the middle of the top end of the top cover 304, a retaining ring 307 is mounted in the middle of the guide pipe 301, and the top surface of the retainer ring 307 is welded with a separation plate 308, while the top surface of the separation plate 308 is provided with a gasket 309, the top surface of the gasket 309 is provided with a first limit frame 310, and the top surface of the first position-limiting frame 310 is provided with a second position-limiting frame 311, and the top surface of the second position-limiting frame 311 is provided with a third position-limiting frame 312, the inner cavities of the first limiting frame 310, the second limiting frame 311 and the third limiting frame 312 are respectively provided with a synthetic fiber felt 313, a glass fiber filter cotton 314 and a non-woven fabric filter cotton 315.

In this embodiment, the bottom cover 302 and the top cover 304 of the filter assembly 3 are rotated to open or seal two ends of the conduit 301, then the outlet pipe 303 and the inlet pipe 305 can be connected to the leak detection pipe 2 and the external pipeline, respectively, so as to circulate the air sucked out by the external detection element into the machine body 1, through the retaining ring 307 and the partition plate 308, not only can support the gasket 309, but also can separate the upper and lower cabins from the inner cavity of the conduit 301, so as to install different devices, through the gasket 309, can support each group of limit frames, then through the first limit frame 310, the second limit frame 311 and the third limit frame 312, the corresponding synthetic fiber mat 313, the glass fiber filter cotton 314 and the non-woven fabric filter cotton 315 can be installed, so as to perform multiple filtration treatment on the gas flowing through the synthetic fiber mat 313, the glass fiber filter cotton 314 and the non-woven fabric filter cotton 315, and then can fully filter the filth in the gas to can prevent that the filth in the gas from following the gas and flowing into to organism 1 in, guarantee organism 1 internals's life and safety.

Specifically, the top end of the outlet pipe 303 and the bottom end of the inlet pipe 305 are welded with locking caps 306, and the locking caps 306 are used for rotatably opening the bottom cover 302 and the top cover 304.

In this embodiment, through locking cap 306 to can make things convenient for the staff to rotate bottom 302 and top cap 304 and open or sealed, improve bottom 302 and top cap 304 convenience of use.

Specifically, the middle parts of the outer wall surfaces of the first limiting frame 310, the second limiting frame 311 and the third limiting frame 312 are all provided with a first groove ring 316, and a first sealing ring 317 is installed in the inner cavity of the first groove ring 316.

In this embodiment, the first groove rings 316 are arranged on the limiting frames, so that the first sealing rings 317 can be conveniently arranged on the limiting frames, and the sealing effect of the limiting frames on the connecting part of the inner wall of the guide pipe 301 can be improved.

Specifically, the bottom surfaces and the top surfaces of the first limiting frame 310, the second limiting frame 311 and the third limiting frame 312 are respectively provided with a tenon 318 and a tenon 319, the tenon 318 and the tenon 319 are respectively provided with a plurality of groups, and simultaneously, each group of the tenon 318 and each group of the tenon 319 correspond to each other in a one-to-one manner and are connected in an inserting manner.

In this embodiment, the tenon 318 and the tenon 319 are engaged with each other, so that the connection stability of the groups of the frames can be improved.

Specifically, a sliding groove 320 is installed at the middle position of the bottom surface of the top cover 304, a pressing plate 321 is arranged below the sliding groove 320, and the top surface of the pressing plate 321 is movably connected with the sliding groove 320 through an upright rod 322.

In this embodiment, through spout 320 and pole setting 322, can be to the spacing installation of clamp plate 321 to can press and hold spacing effect to third spacing frame 312, and then can prevent that each group's spacing frame from rocking from top to bottom.

Specifically, division board 308 bottom surface intermediate position inlays and is connected with conveyer pipe 323 to miniature air pump 324 is installed to the conveyer pipe 323 bottom, and blast pipe 325 is installed to miniature air pump 324 output simultaneously, miniature air pump 324 bottom links to each other with pipe 301 lateral wall bottom through the mount, bottom 302 top fixed surface is connected with spacing collar 326 to the draw-in groove has been seted up at spacing collar 326 inner chamber middle part, and second sealing washer 327 is installed to the draw-in groove inner chamber simultaneously, second sealing washer 327 links to each other with blast pipe 325 bottom grafting, pipe 301 lateral wall bottom is inlayed and is connected with spool 330.

In this embodiment, through conveyer pipe 323, can be with the gaseous transport to miniature air pump 324 after the cabin filters above division board 308, then miniature air pump 324, can carry out the pressure boost to the gas of circulation and handle, then through blast pipe 325 and spacing collar 326, can be with the gaseous transport to outlet pipe 303 after the pressure boost, and then carry to organism 1 in, so that equipment can carry out gas leakage detection to big article and handle, through draw-in groove and second sealing washer 327 on the spacing collar 326, can play the spacing installation effect to blast pipe 325, can prevent again that blast pipe 325 and spacing collar 326 grafting department from leaking gas.

Specifically, the top surface and the bottom surface of the conduit 301 near the edge are both provided with a second groove ring 328, the inner cavity of the second groove ring 328 is provided with a third sealing ring, the top surface of the bottom cover 302 and the bottom surface of the top cover 304 near the edge are integrally formed with a convex ring 329, and the convex ring 329 is connected with the second groove ring 328 in an inserting manner.

In this embodiment, the second groove ring 328, the convex ring 329 and the third sealing ring are mutually matched, so that the sealing effect of the bottom cover 302 and the top cover 304 on the conduit 301 can be improved, and further, the gas can be prevented from leaking from the connecting part of the bottom cover 302 and the top cover 304 and the conduit 301.

Specifically, the support assembly 4 includes a base 401, a top surface of the base 401 is connected to a bracket 402 by a plurality of sets of struts 403, and a top surface of the bracket 402 is attached to a bottom surface of the filter assembly 3.

In this embodiment, through base 401 in supporting component 4, can be through the installation of multiunit branch 403 to bracket 402 to can make bracket 402 hold up filter element 3, and then can improve the stability that filter element 3 used.

Specifically, the control assembly 5 includes a fixing plate 501, a switch 502, an indicator light 503 and a junction box 504 are mounted on the surface of the fixing plate 501, the switch 502 is electrically connected to the micro air pump 324 and the junction box 504 through wires, respectively, and the indicator light 503 is electrically connected to the micro air pump 324 through wires.

In this embodiment, the fixing plate 501 in the control assembly 5 can limit the switch 502, the indicator light 503 and the junction box 504, and then the switch 502 can flexibly turn on or turn off the operation of the micro air pump 324, and then the indicator light 503 can facilitate the staff to check the operation state of the micro air pump 324 from the outside, and through the junction box 504, the electric energy can be provided for the micro air pump 324, thereby ensuring the normal operation of the micro air pump 324.

When the gas filtering device is used, gas flowing into the machine body 1 can be filtered through the filtering component 3, so that the damage to precision parts inside the machine body 1 caused by dirt in the gas can be prevented, the use safety of the machine body 1 can be further protected, the filtering component 3 can be supported through the supporting component 4, the stability of the filtering component 3 in use can be improved, the operation of equipment inside the filtering component 3 can be flexibly controlled through the control component 5, and the gas filtering device is convenient for a user to operate and use; the bottom cover 302 and the top cover 304 in the filtering component 3 are rotated to open or seal two ends of the guide pipe 301, then the air outlet pipe 303 and the air inlet pipe 305 can be respectively connected with the leakage detecting pipe 2 and an external pipeline, further the air sucked out by the external detection part can be circulated into the machine body 1, the gasket 309 and the partition plate 308 can be used for supporting the gasket 309 and separating an upper cabin and a lower cabin from the inner cavity of the guide pipe 301, different equipment can be installed, the gasket 309 can be used for supporting each group of limiting frames, then the first limiting frame 310, the second limiting frame 311 and the third limiting frame 312 can be respectively provided with corresponding synthetic fiber felt 313, glass fiber filter cotton 314 and non-woven fabric filter cotton 315, so that the synthetic fiber felt 313, the glass fiber filter cotton 314 and the non-woven fabric filter cotton 315 can perform multiple filtering treatment on the flowing air, further, the dirt in the gas can be fully filtered, so that the dirt in the gas can be prevented from flowing into the machine body 1 along with the gas, and the service life and safety of parts in the machine body 1 are ensured; through the locking cap 306, the bottom cover 302 and the top cover 304 can be conveniently opened or sealed in a rotating mode by workers, the use convenience of the bottom cover 302 and the top cover 304 is improved, the first groove rings 316 are arranged on the limiting frames, the first sealing rings 317 can be conveniently installed on the limiting frames, the sealing effect of the limiting frames on the connecting positions of the inner walls of the guide pipe 301 can be further improved, the connecting stability of the limiting frames of each group can be improved through the mutual matching of the concave tenons 318 and the convex tenons 319, the limiting installation of the pressing plate 321 can be realized through the sliding grooves 320 and the vertical rods 322, the limiting effect of the third limiting frame 312 can be pressed, and further the limiting frames of each group can be prevented from shaking up and down; the gas filtered by the cabin above the partition plate 308 can be conveyed to the micro air pump 324 through the conveying pipe 323, then the micro air pump 324 can pressurize the circulating gas, and then the pressurized gas can be conveyed to the gas outlet pipe 303 through the gas outlet pipe 325 and the spacing ring 326 and further conveyed to the machine body 1, so that the equipment can perform gas leakage detection processing on large objects, through the clamping groove on the spacing ring 326 and the second sealing ring 327, the limiting installation function on the gas outlet pipe 325 can be realized, the gas leakage at the splicing part of the gas outlet pipe 325 and the spacing ring 326 can be prevented, through the mutual matching of the second groove ring 328, the convex ring 329 and the third sealing ring, the sealing effect of the bottom cover 302 and the top cover 304 on the guide pipe 301 can be improved, and further the gas leakage from the connecting part of the bottom cover 302, the top cover 304 and the guide pipe 301 can be prevented; through the base 401 in the supporting component 4, the bracket 402 can be mounted through a plurality of groups of supporting rods 403, so that the bracket 402 can support the filtering component 3, and the use stability of the filtering component 3 can be improved; through the stationary blade 501 in the control assembly 5, the switch 502, the indicator light 503 and the junction box 504 can be installed in a limiting mode, then the miniature air pump 324 can be flexibly turned on or turned off through the switch 502, then the indicator light 503 can facilitate a worker to check the running state of the miniature air pump 324 from the outside, electric energy can be provided for the miniature air pump 324 through the junction box 504, and the normal running of the miniature air pump 324 can be further guaranteed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a gas filtering mechanism for helium mass spectrometer leak detector, includes organism (1) and leak detection pipe (2), its characterized in that are installed to organism (1) top input: the top of the leakage detecting pipe (2) is spliced with a filtering component (3), the filtering component (3) is used for filtering gas flowing into the machine body (1) and preventing dirt from damaging precision parts inside the machine body (1), the bottom surface of the filtering component (3) is provided with a supporting component (4), the bottom surface of the supporting component (4) is connected with the top surface of the machine body (1), the supporting component (4) is used for supporting the filtering component (3) and achieving a stabilizing function when the filtering component (3) is used, the surface of the filtering component (3) is provided with a control component (5) at a position below the surface, and the control component (5) is used for controlling the operation of equipment inside the filtering component (3).

2. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 1, wherein: the filter assembly (3) comprises a guide pipe (301), a bottom cover (302), an air outlet pipe (303), a top cover (304) and an air inlet pipe (305), wherein the bottom end and the top end of the guide pipe (301) are respectively connected with the bottom cover (302) and the top cover (304) in a rotating mode, the air outlet pipe (303) is integrally formed in the middle of the bottom end of the bottom cover (302), the air inlet pipe (305) is integrally formed in the middle of the top end of the top cover (304), a check ring (307) is installed in the middle of the guide pipe (301), a partition plate (308) is welded to the surface of the top of the check ring (307), a gasket (309) is arranged on the top surface of the partition plate (308), a first limiting frame (310) is installed on the top surface of the gasket (309), a second limiting frame (311) is arranged on the top surface of the first limiting frame (310), a third limiting frame (312) is arranged on the top surface of the second limiting frame (311), and the first limiting frame (310), The inner cavities of the second limit frame (311) and the third limit frame (312) are respectively provided with a synthetic fiber felt (313), glass fiber filter cotton (314) and non-woven fabric filter cotton (315).

3. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: and locking caps (306) are welded at the top end of the air outlet pipe (303) and the bottom end of the air inlet pipe (305), and the locking caps (306) are used for rotatably opening the bottom cover (302) and the top cover (304).

4. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: first groove ring (316) have all been seted up in first spacing frame (310), second spacing frame (311) and third spacing frame (312) outer wall surface middle part to first sealing washer (317) are installed to first groove ring (316) inner chamber.

5. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: first spacing frame (310), second spacing frame (311) and third spacing frame (312) bottom surface and top surface all are equipped with tenon (318) and tenon (319), tenon (318) with tenon (319) all are equipped with a plurality of groups, every group simultaneously tenon (318) and every group tenon (319) one-to-one, and the two grafting links to each other.

6. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: the middle position of the bottom surface of the top cover (304) is provided with a sliding chute (320), a pressing plate (321) is arranged below the sliding chute (320), and the top surface of the pressing plate (321) is movably connected with the sliding chute (320) through a vertical rod (322).

7. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: division board (308) bottom surface intermediate position is inlayed and is connected with conveyer pipe (323) to miniature air pump (324) are installed to conveyer pipe (323) bottom, and blast pipe (325) are installed to miniature air pump (324) output simultaneously, miniature air pump (324) bottom links to each other through mount and pipe (301) lateral wall bottom, bottom (302) top fixed surface is connected with spacing collar (326) to spacing collar (326) inner chamber middle part has seted up the draw-in groove, and second sealing washer (327) is installed to the draw-in groove inner chamber simultaneously, second sealing washer (327) link to each other with blast pipe (325) bottom grafting, pipe (301) a lateral wall bottom is inlayed and is connected with spool (330).

8. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 2, wherein: the top surface and the bottom surface of the conduit (301) are both provided with a second groove ring (328) close to the edge, the inner cavity of the second groove ring (328) is provided with a third sealing ring, the top surface of the bottom cover (302) and the bottom surface of the top cover (304) are integrally formed with a convex ring (329) close to the edge, and the convex ring (329) is connected with the second groove ring (328) in an inserting manner.

9. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 1, wherein: the support assembly (4) comprises a base (401), the top surface of the base (401) is connected with a bracket (402) through a plurality of groups of struts (403), and the top surface of the bracket (402) is attached to the bottom surface of the filter assembly (3).

10. A gas filtering mechanism for a helium mass spectrometer leak detector as claimed in claim 1, wherein: the control assembly (5) comprises a fixing plate (501), and a switch (502), an indicator light (503) and a junction box (504) are installed on the surface of the fixing plate (501).