CN220934011U - Gas lens device applied to SPAMS mass spectrometer - Google Patents

Abstract

The application relates to an air lens device applied to a SPAMS mass spectrometer. The gas lens device applied to the SPAMS mass spectrometer comprises: the lens comprises an outer tube, a multi-stage lens, a first limiting piece and a second limiting piece; the outer tube has an inlet end and an outlet end; the multi-stage lenses are arranged in the lumen of the outer tube and are sequentially arranged along the axial direction of the outer tube, and the outer diameters of the multi-stage lenses are consistent with the inner diameter of the lumen, so that the outer peripheral surfaces of the multi-stage lenses are attached to the inner wall of the lumen; through holes for passing the aerosol are respectively arranged in the multistage lenses, and the through holes of the multistage lenses are all arranged concentrically with the outer tube; the first limiting piece is connected with the inlet end, and the second limiting piece is connected with the outlet end, so that the axial position of the multi-stage lens is limited between the first limiting piece and the second limiting piece. Compared with the gas lens device applied to the SPAMS mass spectrometer in the prior art, the gas lens device applied to the SPAMS mass spectrometer can effectively improve concentricity, further can effectively improve the aggregation effect on aerosol, and is low in processing and assembling difficulty.

Description

Gas lens device applied to SPAMS mass spectrometer

Technical Field

The application relates to the technical field of gas lens devices of SPAMS mass spectrometers, in particular to a gas lens device applied to a SPAMS mass spectrometer.

Background

Aerosol particles are typically focused by an air lens arrangement in a SPAMS mass spectrometer (single particle mass spectrometer) to increase the impingement rate of the ionised laser. The gas lens device generally includes an outer tube and a multi-stage lens disposed in sequence in the axial direction within the outer tube. Each stage of lenses is provided with a through hole for passing aerosol particles. Aerosol particles pass through the plurality of through holes after entering the aerosol lens arrangement from the external environment so that focusing can be achieved.

In some prior art solutions, the matching relationship between any two adjacent lenses of the gas lens device is that the axial end face of one lens is provided with a positioning protrusion, the axial end face of the other lens is provided with a positioning groove, and the concentricity of the two adjacent lenses is ensured by the positioning matching of the positioning protrusion and the positioning groove, so that the concentricity between the through holes of the lenses of the multiple stages is determined by the positioning matching relationship between the lenses.

However, this requires ensuring the machining accuracy of the positioning projections and the positioning grooves between any adjacent two-stage lenses at the time of machining, and the machining difficulty is large. Moreover, according to the number of lenses of the gas lens apparatus, there are generally plural sets of positioning projections and positioning grooves along the axial direction of the outer tube, machining and assembling errors between the plural sets of positioning projections and the positioning grooves are accumulated, and concentricity between the plural through holes of the gas lens apparatus is directly affected by such accumulated errors, so that the concentricity is difficult to be raised. Insufficient concentricity can lead to poor consistency of focusing effect of aerosol particles, and problems of defocusing of particle beams with different particle sizes, off-axis focusing and the like can possibly occur, and finally, uneven distribution of focused particles is caused, so that the laser ionization efficiency of the SPAMS mass spectrometer is directly influenced.

Disclosure of utility model

Based on this, it is necessary to provide a gas lens device applied to a SPAMS mass spectrometer, which aims at the problems that in the prior art, the processing and assembly errors between a plurality of groups of positioning protrusions and positioning grooves are accumulated, so that the concentricity between a plurality of through holes of the gas lens device is directly affected by the accumulated errors, and the concentricity is difficult to be improved.

A gas lens apparatus for use in a SPAMS mass spectrometer, the gas lens apparatus for use in a SPAMS mass spectrometer comprising: the lens comprises an outer tube, a multi-stage lens, a first limiting piece and a second limiting piece;

The outer tube having an inlet end and an outlet end;

The multi-stage lenses are arranged in the lumen of the outer tube and are sequentially arranged along the axial direction of the outer tube, and the outer diameters of the multi-stage lenses are consistent with the inner diameter of the lumen, so that the outer peripheral surfaces of the multi-stage lenses are attached to the inner wall of the lumen; the inside of the multistage lens is respectively provided with a through hole for passing aerosol, and the through holes of the multistage lens are all arranged concentrically with the outer tube;

The first limiting piece is connected with the inlet end, and the second limiting piece is connected with the outlet end, so that the axial position of the multi-stage lens is limited between the first limiting piece and the second limiting piece.

In an embodiment, the lens adjacent to the first limiting member is abutted with the first limiting member along the axial direction; the lens adjacent to the second limiting piece is abutted with the second limiting piece along the axial direction; any two adjacent stages of lenses are abutted in the axial direction.

In one embodiment, in any two adjacent stages of lenses, a positioning protrusion is arranged on the axial end face of one stage of the lenses, a positioning groove is arranged on the axial end face of the other stage of the lenses, and the positioning protrusion is matched with the positioning groove; the positioning protrusion is abutted with the bottom of the positioning groove.

In an embodiment, in any two adjacent stages of lenses, an axial end face of one stage of the lenses is arranged at intervals with an axial end face of the other stage of the lenses, an inter-stage sealing ring is arranged in a gap between the two stages of the lenses, the inter-stage sealing ring is sleeved on the positioning protrusion, the inner peripheral face of the inter-stage sealing ring is abutted with the positioning protrusion, and the outer peripheral face of the inter-stage sealing ring is abutted with the inner wall of the pipe cavity.

In one embodiment, the outer side of the inlet end of the outer tube is provided with a flange; the first limiting piece is an end cover, the end cover comprises a cover body and a cover sleeve which are connected, the cover body is positioned on one axial side of the inlet end of the outer tube and is used for limiting the multi-stage lens, and the cover sleeve is sleeved on the periphery of the outer side face of the inlet end of the outer tube; the cover sleeve is connected with the flange through bolts.

In an embodiment, the gas lens device applied to the SPAMS mass spectrometer further includes a nozzle, the nozzle is disposed on a side of the multistage lens, which is close to the outlet end, and the nozzle hole of the nozzle is concentrically disposed with the through hole of the multistage lens.

In an embodiment, the nozzle comprises a first section and a second section connected along an axial direction, wherein the outer diameter of the first section is larger than that of the second section, the first section is closer to the multi-stage lens than the second section, the spray hole comprises a first hole formed in the first section and a second hole formed in the second section, the inner diameter of the first hole is larger than that of the second hole, and the second section penetrates through the second limiting piece.

In one embodiment, a gasket is sleeved on the second section, and the gasket is clamped between the first section and the second limiting piece; the gasket is towards the outer fringe of the one end of first section is equipped with along circumference extension's seal groove, be provided with the export sealing washer in the seal groove.

In an embodiment, the inner wall of the lumen is provided with a mounting groove extending along the circumferential direction, the second limiting part is an opening clamp spring, and the opening clamp spring is mounted in the mounting groove.

The gas lens device applied to the SPAMS mass spectrometer is characterized in that the first limiting piece is connected with the inlet end of the outer tube, and the second limiting piece is connected with the outlet end of the outer tube, so that the axial position of the multi-stage lens is limited between the first limiting piece and the second limiting piece, and the axial position of the multi-stage lens is limited in the outer tube. The outer diameters of the multi-stage lenses are consistent with the inner diameters of the tube cavities, so that the outer peripheral surfaces of the multi-stage lenses are attached to the inner walls of the tube cavities, and the radial positions of the multi-stage lenses relative to the outer tube can be accurately determined. Therefore, the concentricity error of the through hole of the multi-stage lens is only relevant to the processing straightness of the wall of the through hole, and the accuracy of the concentricity of the through hole of the multi-stage lens can be reliably ensured as long as the straightness consistency of the wall of the through hole of the multi-stage lens is ensured, so that compared with the gas lens device applied to the SPAMS mass spectrometer in the prior art, the gas lens device applied to the SPAMS mass spectrometer can effectively improve the concentricity, and further the aggregation effect on aerosol can be effectively improved. Compared with the polymerization effect of the gas lens device applied to the SPAMS mass spectrometer in the prior art, the polymerization effect of the gas lens device applied to the SPAMS mass spectrometer in the embodiment of the application is obviously better, and the distribution areas of the large and small particles are more consistent. Moreover, the gas lens device applied to the SPAMS mass spectrometer has low processing and assembling difficulties compared with the gas lens device applied to the SPAMS mass spectrometer in the prior art.

Drawings

Fig. 1 is a schematic structural diagram of an air lens device applied to a SPAMS mass spectrometer according to an embodiment.

Fig. 2 is a cross-sectional view of the gas lens apparatus of fig. 1 applied to a SPAMS mass spectrometer.

Fig. 3 is a partial enlarged view of fig. 2.

Fig. 4 is a schematic diagram of focusing effect of an air lens device applied to a SPAMS mass spectrometer in the prior art.

Fig. 5 is a schematic diagram of focusing effect of an air lens device applied to a SPAMS mass spectrometer according to an embodiment of the present application.

Reference numerals illustrate:

100. An outer tube; 110. a flange;

200. A lens; 210. a through hole; 220. positioning the bulge; 230. a positioning groove; 240. a gap; 250. positioning the bulge;

300. A first limiting member; 310. a cover body; 320. a cover sleeve;

400. A second limiting piece;

500. A nozzle; 510. a first section; 511. a first hole; 512. a positioning groove; 513. a gap; 520. a second section; 521. a second hole;

600. a gasket; 610. and (5) sealing the groove.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, an embodiment of the present application provides an air lens apparatus for a SPAMS mass spectrometer. The gas lens device includes: the outer tube 100, the multi-stage lens 200, the first stopper 300, and the second stopper 400. The outer tube 100 has an inlet end and an outlet end. The multi-stage lenses 200 are disposed within the lumen of the outer tube 100, and the multi-stage lenses 200 are sequentially arranged in the axial direction of the outer tube 100. The outer diameters of the multi-stage lenses 200 are all identical to the inner diameter of the lumen so that the outer peripheral surfaces of the multi-stage lenses 200 are all adhered to the inner wall of the lumen. The inside of the multistage lens 200 is provided with through holes 210 for passing the aerosol, respectively, and the through holes 210 of the multistage lens 200 are all arranged concentrically with the outer tube 100. The first stopper 300 is connected to the inlet end of the outer tube 100, and the second stopper 400 is connected to the outlet end of the outer tube 100 such that the axial position of the multi-stage lens 200 is limited between the first stopper 300 and the second stopper 400.

The above-mentioned gas lens device applied to the SPAMS mass spectrometer, the first limiting member 300 is connected with the inlet end of the outer tube 100, and the second limiting member 400 is connected with the outlet end of the outer tube 100, so that the axial position of the multi-stage lens 200 is limited between the first limiting member 300 and the second limiting member 400, and the axial position of the multi-stage lens 200 is ensured to be limited in the outer tube 100. Since the outer diameters of the multi-stage lenses 200 are all identical to the inner diameter of the lumen, the outer circumferential surfaces of the multi-stage lenses 200 are all attached to the inner wall of the lumen, and thus the radial positions of the multi-stage lenses 200 relative to the outer tube 100 can be accurately determined. In this way, the concentricity error of the through hole 210 of the multi-stage lens 200 is only related to the processing straightness of the wall of the through hole 210, so long as the straightness of the wall of the through hole 210 of the multi-stage lens 200 is guaranteed to be consistent, that is, the concentricity precision of the through hole 210 of the multi-stage lens 200 can be reliably guaranteed, and therefore, compared with the gas lens device applied to the SPAMS mass spectrometer in the prior art, the gas lens device applied to the SPAMS mass spectrometer can effectively improve the concentricity, and further, the aggregation effect on aerosol can be effectively improved. With reference to fig. 4 and fig. 5, compared with the effect of the gas lens device applied to the SPAMS mass spectrometer in the prior art, the effect of the gas lens device applied to the SPAMS mass spectrometer in the embodiment of the application is obviously better, and the distribution areas of the size particles are more consistent.

Moreover, since the outer diameters of the multi-stage lenses 200 are all identical to the inner diameters of the lumens, the outer circumferential surfaces of the multi-stage lenses 200 are all attached to the inner walls of the lumens, so that the radial positions of the multi-stage lenses 200 relative to the outer tube 100 can be accurately determined. As long as the straightness of the hole wall of the through hole 210 of the multi-stage lens 200 is guaranteed to be consistent, the concentricity precision of the through hole 210 of the multi-stage lens 200 can be reliably guaranteed, so that the processing and assembling difficulty of the gas lens device (compared with the gas lens device applied to the SPAMS mass spectrometer in the prior art) applied to the SPAMS mass spectrometer is low.

Referring to fig. 2 and 3, in an embodiment, the lens 200 adjacent to the first stopper 300 is in contact with the first stopper 300 in the axial direction, the lens 200 adjacent to the second stopper 400 is in contact with the second stopper 400 in the axial direction, and any two adjacent stages of lenses 200 are in contact in the axial direction. That is, the first stopper 300 and the second stopper 400 clamp the multi-stage lens 200 from both axial ends of the outer tube 100, so that the axial position of the multi-stage lens 200 can be more accurately defined, thereby ensuring the positional accuracy of the multi-stage lens 200.

Referring to fig. 2 and 3, in an embodiment, in any two adjacent lenses 200, a positioning protrusion 220 is disposed on an axial end surface of one lens 200, and a positioning groove 230 is disposed on an axial end surface of the other lens 200, where the positioning protrusion 220 is matched with the positioning groove 230. The positioning protrusion 220 abuts against the groove bottom of the positioning groove 230. That is, the positioning protrusion 220 abuts against the groove bottom of the positioning groove 230, so that any adjacent two-stage lens 200 is axially abutted. The matching of the positioning protrusion 220 and the positioning groove 230 further ensures the accurate relative position of the adjacent two-stage lenses 200 on the one hand, and on the other hand, the abutting between the adjacent two-stage lenses 200 is convenient to realize.

Referring to fig. 2 and 3, in an embodiment, in any adjacent two-stage lens 200, an axial end surface of one stage lens 200 is spaced from an axial end surface of another stage lens 200, and a gap 240 is formed therebetween, and an inter-stage seal ring is disposed in the gap 240. In this way, the interstage seal ring can be used to seal the adjacent two-stage lenses 200, thereby improving the air tightness. Specifically, the interstage seal ring is sleeved on the positioning protrusion 220, the inner peripheral surface of the interstage seal ring is abutted with the positioning protrusion 220, and the outer peripheral surface of the interstage seal ring is abutted with the inner wall of the pipe cavity. The axial ends of the inter-stage seal ring are clamped by the axial end faces of the adjacent two-stage lenses 200.

Referring to fig. 2 and 3, in one embodiment, the outer side of the inlet end of the outer tube 100 is provided with a flange 110. The first stopper 300 is an end cap, which includes a cap body 310 and a cap sleeve 320 connected, and the cap body 310 is located at one axial side of the inlet end of the outer tube 100 for stopping the multi-stage lens 200. The cover 320 is fitted around the outer side surface of the inlet end of the outer tube 100. The flange 110 is disposed on a side of the cover 320 facing away from the cover 310. The cover sleeve 320 is bolted to the flange 110 so that the end cap can be securely connected to the outer tube 100 such that the cover 310 is tightly held against the lens 200 adjacent thereto. Flange 110 may be integrally formed with outer tube 100. The cover 310 and the cover 320 may be integrally formed.

It will be appreciated that the cover 310 is provided with an opening for allowing the through-hole 210 of the lens 200 adjacent to the cover 310 to communicate with the external environment, so that an aerosol of the external environment can enter the through-hole 210 of the lens 200 from the opening.

Referring to fig. 2 and 3, in an embodiment, the gas lens apparatus applied to the SPAMS mass spectrometer further includes a nozzle 500, the nozzle 500 is disposed between the multi-stage lens 200 and the second stopper 400, and the spray hole of the nozzle 500 is disposed concentrically with the through hole 210 of the multi-stage lens 200. The nozzle 500 is used to spray the aerosol passing through the through-hole 210.

It can be appreciated that when the second stopper 400 and the first stopper 300 clamp the multi-stage lens 200, the nozzle 500 is clamped between the multi-stage lens 200 and the second stopper 400.

Referring to fig. 2 and 3, in one embodiment, the nozzle 500 includes a first segment 510 and a second segment 520 axially connected, the first segment 510 having an outer diameter greater than an outer diameter of the second segment 520, the first segment 510 being closer to the multi-stage lens 200 than the second segment 520, the second segment 520 passing through the second stop 400. The nozzle hole includes a first hole 511 provided in the first section 510 and a second hole 521 provided in the second section 520, the first hole 511 having an inner diameter larger than that of the second hole 521.

Since the outer diameter of the first section 510 is greater than that of the second section 520, the second section 520 passes through the second stopper 400, and thus the second stopper 400 can limit and tightly abut an end surface of the first section 510 facing away from the end of the multi-stage lens 200 (i.e., a step formed at a junction of a side surface of the first section 510 and a side surface of the second section 520) in the axial direction of the outer tube 100, so that the nozzle 500 is clamped between the multi-stage lens 200 and the second stopper 400.

As shown in fig. 3, in one embodiment, the location-engagement structure between the lens 200 adjacent to the nozzle 500 and the first segment 510 of the nozzle 500 is the same as the location-engagement structure between any adjacent two-stage lens 200.

As shown in fig. 3, in one embodiment, in any two adjacent lenses 200, a positioning protrusion 250 is provided on an axial end surface of the lens 200 adjacent to the nozzle 500, and a positioning groove 512 is provided on an axial end surface of the first section 510, and the positioning protrusion 250 is engaged with the positioning groove 512. The positioning projection 250 abuts against the groove bottom of the positioning groove 512.

As shown in fig. 3, in an embodiment, a gap 513 is formed between an axial end surface of the lens 200 adjacent to the nozzle 500 and an axial end surface of the first segment 510, and a first seal ring is disposed in the gap 513. In this way, the first seal ring may seal between the lens 200 and the first segment 510 adjacent to the nozzle 500, thereby improving the air tightness. Specifically, the first sealing ring is sleeved on the positioning protrusion 250, the inner peripheral surface of the first sealing ring is abutted with the positioning protrusion 250, and the outer peripheral surface of the first sealing ring is abutted with the inner wall of the lumen. The axial ends of the first seal ring are clamped by the axial end face of the lens 200 adjacent to the nozzle 500 and the axial end face of the first segment 510.

Referring to fig. 2 and 3, in an embodiment, a gasket 600 is sleeved on the second section 520, and the gasket 600 is clamped between the first section 510 and the second limiting member 400, so that the gasket 600 can make up a gap between the first section 510 and the second limiting member 400, and the first section 510 indirectly abuts against the second limiting member 400 through the gasket 600, so as to obtain limiting of the second limiting member 400.

Referring to fig. 2 and 3, in one embodiment, a seal groove 610 extending along a circumferential direction is provided at an outer edge of an end of the gasket 600 facing the first section 510, and an outlet seal ring is provided in the seal groove 610 and is adapted to a shape of the outlet seal ring. The provision of seal groove 610 provides installation space for the outlet seal ring. The outlet sealing ring is used for sealing between the end surface of the first section 510, which is opposite to one end of the multi-stage lens 200, and the inner wall of the tube cavity, so that the air tightness is further improved. Specifically, the inner peripheral surface of the outlet seal ring is in contact with the gasket 600, the outer peripheral surface of the outlet seal ring is in contact with the inner wall of the lumen, and both axial ends of the outlet seal ring are clamped with the gasket 600 by the end surface of the first segment 510 facing away from the end of the multi-stage lens 200.

In an embodiment, the inner wall of the lumen of the outer tube 100 is provided with a mounting groove extending along the circumferential direction, and the second limiting member 400 is an opening clamp spring, and the opening clamp spring is mounted in the mounting groove, so that the opening clamp spring can be reliably connected with the outer tube 100.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A gas lens apparatus for use in a SPAMS mass spectrometer, the gas lens apparatus for use in a SPAMS mass spectrometer comprising: the lens comprises an outer tube, a multi-stage lens, a first limiting piece and a second limiting piece;

The outer tube having an inlet end and an outlet end;

The multi-stage lenses are arranged in the lumen of the outer tube and are sequentially arranged along the axial direction of the outer tube, and the outer diameters of the multi-stage lenses are consistent with the inner diameter of the lumen, so that the outer peripheral surfaces of the multi-stage lenses are attached to the inner wall of the lumen; the inside of the multistage lens is respectively provided with a through hole for passing aerosol, and the through holes of the multistage lens are all arranged concentrically with the outer tube;

The first limiting piece is connected with the inlet end, and the second limiting piece is connected with the outlet end, so that the axial position of the multi-stage lens is limited between the first limiting piece and the second limiting piece.

2. The gas lens apparatus for use in a SPAMS mass spectrometer according to claim 1, wherein the lens adjacent the first stop is in axial abutment with the first stop; the lens adjacent to the second limiting piece is abutted with the second limiting piece along the axial direction; any two adjacent stages of lenses are abutted in the axial direction.

3. The gas lens device applied to the SPAMS mass spectrometer according to claim 2, wherein in any two adjacent stages of lenses, a positioning protrusion is arranged on the axial end face of one stage of the lenses, a positioning groove is arranged on the axial end face of the other stage of the lenses, and the positioning protrusion is matched with the positioning groove; the positioning protrusion is abutted with the bottom of the positioning groove.

4. A gas lens device applied to a SPAMS mass spectrometer according to claim 3, wherein in any two adjacent stages of lenses, an axial end face of one stage of the lenses and an axial end face of the other stage of the lenses are arranged at intervals, an inter-stage sealing ring is arranged in a gap between the two stages of the lenses, the inter-stage sealing ring is sleeved on the positioning protrusion, an inner peripheral surface of the inter-stage sealing ring is abutted with the positioning protrusion, and an outer peripheral surface of the inter-stage sealing ring is abutted with an inner wall of the pipe cavity.

5. The gas lens device for use in a SPAMS mass spectrometer according to claim 1, wherein the outer side of the inlet end of the outer tube is provided with a flange; the first limiting piece is an end cover, the end cover comprises a cover body and a cover sleeve which are connected, the cover body is positioned on one axial side of the inlet end of the outer tube and is used for limiting the multi-stage lens, and the cover sleeve is sleeved on the periphery of the outer side face of the inlet end of the outer tube; the cover sleeve is connected with the flange through bolts.

6. The gas lens apparatus for use in a SPAMS mass spectrometer according to claim 1, further comprising a nozzle disposed on a side of the multistage lens adjacent to the outlet end, the nozzle orifice of the nozzle being disposed concentric with the through hole of the multistage lens.

7. The gas lens apparatus for use in a SPAMS mass spectrometer according to claim 6, wherein the nozzle comprises a first section and a second section connected in an axial direction, the first section having an outer diameter greater than an outer diameter of the second section, the first section being closer to the multi-stage lens than the second section, the orifice comprising a first aperture provided in the first section and a second aperture provided in the second section, an inner diameter of the first aperture being greater than an inner diameter of the second aperture, the second section passing through the second stop.

8. The gas lens apparatus for use in a SPAMS mass spectrometer according to claim 7, wherein the second section is sleeved with a spacer, the spacer being clamped between the first section and the second stop.

9. The gas lens device for use in a SPAMS mass spectrometer according to claim 8, wherein a seal groove extending in a circumferential direction is provided on an outer edge of an end of the gasket facing the first section, and an outlet seal ring is provided in the seal groove.

10. The gas lens device applied to the SPAMS mass spectrometer according to claim 1, wherein the inner wall of the tube cavity is provided with a mounting groove extending along the circumferential direction, the second limiting piece is an opening clamp spring, and the opening clamp spring is mounted in the mounting groove.