CN221327645U - Insulating sealing structure and gas phase molecule ionization cavity device - Google Patents

Abstract

The utility model provides an insulating sealing structure and a gas-phase molecular ionization cavity device, wherein the insulating sealing structure comprises a sleeve, the inner peripheral wall of the sleeve forms a first insulating surface, and the outer peripheral wall of the sleeve forms a second insulating surface; the sleeve is provided with a plurality of threaded holes at intervals along the axial direction, and each threaded hole is communicated with the inner cavity of the sleeve; the sleeve is suitable for sleeving and fixing a plurality of ion lens modules and a plurality of gas path lens modules, and the gas path connectors of the gas path lens modules are respectively in threaded fit with one of the threaded holes. The insulating sealing structure provided by the utility model can improve the ion signal intensity in the gas phase molecular ionization process, so that the ionization efficiency is improved, and the sealing performance of the cavity can be improved by utilizing the sleeve, so that the sensitivity and the accuracy of an analysis instrument are improved.

Description

Insulating sealing structure and gas phase molecule ionization cavity device

Technical Field

The utility model belongs to the technical field of chemical analysis instruments, and particularly relates to an insulating sealing structure and a gas-phase molecular ionization cavity device.

Background

VOCs (Volatile Organic Compounds ) are common gaseous pollutants in the atmosphere. Many techniques for analysis and detection of volatile organic compounds require that neutral sample molecules of the volatile organic compounds to be detected be ionized to form product ions, and then the signal of the product ions be detected, such as chemical ionization mass spectrometry, atmospheric pressure ionization mass spectrometry, proton transfer mass spectrometry, ion molecular reaction mass spectrometry, mobility spectrometry, and various chemical ionization-based analytical instruments, etc., where ionization of the neutral sample molecules is accomplished in gas phase molecular ionization chambers in these instruments, and thus ionization chambers are an important component in the volatile organic compound analytical instruments.

Currently, the gas phase molecular ionization chamber device in the volatile organic compound analysis instrument is generally in a connection form of forming a chamber by array discharge between ion lens modules. This ionization chamber structure can be easily installed and removed, but two problems are brought thereby: in the mode of interconnection of the ion lens modules, the inner layer of the cavity is an inner layer part of the metal electrode, and when parent ions and product ions collide with the surface of the metal electrode in the cavity space in the collision movement process, ion signals are captured by the metal electrode, so that the strength of the whole signals is reduced; secondly, the ionization cavity is in a composition form of array discharge of lenses, gaps exist between the lenses in the composition form, and the phenomena of air leakage or vacuum incapability of maintaining are easy to occur; the presence of both of these problems can reduce the sensitivity and accuracy of the analytical instrument.

Disclosure of utility model

The embodiment of the utility model provides an insulating sealing structure and a gas-phase molecular ionization cavity device, which aim to improve the ion signal intensity in the gas-phase molecular ionization process and improve the cavity tightness.

In order to achieve the above purpose, the utility model adopts the following technical scheme: in a first aspect, there is provided an insulating sealing structure comprising a sleeve, an inner peripheral wall of the sleeve forming a first insulating surface, an outer peripheral wall of the sleeve forming a second insulating surface; the sleeve is provided with a plurality of threaded holes at intervals along the axial direction, and each threaded hole is communicated with the inner cavity of the sleeve; the sleeve is suitable for sleeving and fixing a plurality of ion lens modules and a plurality of gas path lens modules, and the gas path connectors of the gas path lens modules are respectively in threaded fit with one of the threaded holes.

With reference to the first aspect, in one possible implementation manner, an insulation plug is preset in the threaded hole, the insulation plug is in screwed fit with the threaded hole, and the insulation plug is located between the first insulation surface and the second insulation surface.

In some embodiments, the two ends of the sleeve are provided with external threads, the two ends of the sleeve are screwed with clamping nuts based on the external threads, and the plurality of ion lens modules and the plurality of gas path lens modules are fastened based on the clamping nuts.

Illustratively, a plurality of insulating spacers are sleeved on the sleeve at intervals, and at least one insulating spacer is clamped between adjacent ion lens modules, between adjacent ion lens modules and gas path lens modules and between adjacent gas path lens modules.

For example, the insulating spacer includes a first insulating sleeve and a second insulating sleeve; wherein, the first insulating sleeve is suitable for being sleeved on the sleeve; the second insulating sleeve is suitable for being sleeved on the sleeve, and an elastic element is arranged between the second insulating sleeve and the first insulating sleeve.

In some embodiments, the first insulating sleeve is provided with a first annular table towards the outer peripheral edge of the second insulating sleeve, and the second insulating sleeve is provided with a second annular table towards the inner peripheral edge of the first insulating sleeve; the side walls of the first insulating sleeve and the second insulating sleeve, which are opposite, are enclosed into a compression cavity based on the first annular table and the second annular table, and the elastic element is arranged in the compression cavity.

For example, the elastic element is a disc spring, the disc spring is sleeved on the second annular table, and the periphery of the disc spring is abutted with the inner annular surface of the first annular table.

Illustratively, the sleeve is an integrally formed insulative sleeve.

The insulation sealing structure provided by the utility model has the beneficial effects that: compared with the prior art, the insulating sealing structure adopts the sleeve as a connecting base of the ion lens module and the gas path lens module, so that the interior of each ion lens module and the gas path lens module form a closed insulating cavity based on the first insulating surface, and the loss caused by collision between a parent ion or product ion signal and the metal electrode surface of the ion lens module in the ionization reaction process can be avoided, thereby improving the ion signal intensity of gas phase product ions, and being beneficial to improving the separation efficiency and the detection sensitivity; in addition, the second insulating surface can ensure that the ion lens modules and/or the gas path lens modules which are arranged on the sleeve at intervals are isolated from each other, so that voltage signals between the ion lens modules are prevented from interfering with each other, on the basis, the sealing effect of the sleeve can prevent the gap between the ion lens modules and/or the gas path lens modules from generating air leakage phenomenon, the vacuum degree required by gas phase molecular ionization is favorably maintained, pollution caused by external gas penetrating into an insulating cavity is avoided, and the detection accuracy of a subsequent analysis instrument is further improved.

In a second aspect, an embodiment of the present utility model further provides a gas-phase molecular ionization cavity device, including the insulating sealing structure described above. Compared with the prior art, the gas-phase molecular ionization cavity device provided by the embodiment of the utility model can improve the ion signal intensity in the gas-phase molecular ionization process through the insulating sealing structure, so that the ionization efficiency is improved, and the cavity tightness can be improved by utilizing the sleeve, so that the sensitivity and the accuracy of an analysis instrument are improved.

Drawings

Fig. 1 is a schematic cross-sectional structure of an insulating sealing structure according to an embodiment of the present utility model;

fig. 2 is a schematic cross-sectional structure of a first insulating sleeve and a second insulating sleeve according to an embodiment of the present utility model.

In the figure: 100. a sleeve; 101. a first insulating surface; 102. a second insulating surface; 103. a threaded hole; 1031. an insulation plug; 104. an external thread; 105. clamping a nut; 200. an ion lens module; 300. a gas path lens module; 301. the gas circuit joint; 400. an insulating spacer; 401. a first insulating sleeve; 4011. a first ring table; 402. a second insulating sleeve; 4021. a second ring table; 403. an elastic element; 404. a compression chamber.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying 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 one or more such feature. In the description of the present application, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.

Referring to fig. 1 and 2 together, an insulation sealing structure provided by the present utility model will now be described. The insulating sealing structure comprises a sleeve 100, wherein the inner peripheral wall of the sleeve 100 forms a first insulating surface 101, and the outer peripheral wall of the sleeve 100 forms a second insulating surface 102; the sleeve 100 is provided with a plurality of threaded holes 103 at intervals along the axial direction, and each threaded hole 103 is communicated with the inner cavity of the sleeve 100; the sleeve 100 is adapted to socket and fix the plurality of ion lens modules 200 and the plurality of gas path lens modules 300, and the gas path connector 301 of each gas path lens module 300 is respectively in threaded engagement with one of the threaded holes 103.

It should be understood that, in this embodiment, the sleeve 100 may be a sleeve 100 integrally formed of a processable insulating material, or may be formed by providing insulating coatings on an inner peripheral wall and an outer peripheral wall after processing a conventional material to form the first insulating surface 101 and the second insulating surface 102. The threaded hole 103 on the sleeve 100 is used for connecting with the gas path joint 301 of the gas path lens module 300, and gas phase neutral sample molecules to be ionized are introduced into the insulating sealing cavity formed inside the sleeve 100 through the gas path joint 301; it should be explained that, in practice, both the ion lens module 200 and the gas channel lens module 300 are used to form an electric field, wherein the gas channel lens module 300 is structurally added with the gas channel connector 301 relative to the ion lens module 200, the arrangement order of each ion lens module 200 and each gas channel lens module 300 should be determined according to practical requirements, generally, the arrangement manner of one or more ion lens modules 200 between two gas channel lens modules 300 is adopted, so that the threaded holes 103 formed on the sleeve 100 in this embodiment are selectively used, that is, only the threaded holes 103 corresponding to the positions of the gas channel lens modules 300 need to be screwed with the corresponding gas channel connectors 301, in other words, the number of the threaded holes 103 is large, and the installation of the gas channel lens modules 300 with different arrangements can be selectively used, thereby improving the application range of the sleeve 100.

It should be noted that, in the ionization process, the voltages applied to the ion lens modules 200 and the gas path lens module 300 are high or low, so that the adjacent ion lens modules 200 and the gas path lens module 300 need to be insulated from each other, in this embodiment, under the condition that the adjacent modules are spaced from each other, the second insulating surface 102 of the outer peripheral wall of the sleeve 100 is utilized to meet the insulation requirement between the adjacent modules, and of course, an insulating spacer can be clamped between the adjacent modules.

Compared with the prior art, the insulating sealing structure provided by the embodiment adopts the sleeve 100 as a connection basis of the ion lens module 200 and the gas-path lens module 300, so that the interiors of the ion lens module 200 and the gas-path lens module 300 can form a closed insulating cavity based on the first insulating surface 101, and the loss caused by collision between the parent ion or product ion signal and the metal electrode surface of the ion lens module 200 in the ionization reaction process can be avoided, thereby improving the ion signal intensity of gas-phase product ions, and being beneficial to improving the separation efficiency and the detection sensitivity; in addition, the second insulating surface 102 can ensure that the ion lens modules 200 and/or the gas path lens modules 300 which are arranged on the sleeve 100 at intervals are isolated from each other, so that voltage signals between the ion lens modules 200 are prevented from interfering with each other, on the basis, the sealing effect of the sleeve 100 can prevent the gap between the ion lens modules 200 and/or the gas path lens modules 300 from generating air leakage phenomenon, the vacuum degree required by gas phase molecular ionization is favorably maintained, the pollution caused by the penetration of external air into an insulating cavity is avoided, and the detection accuracy of a subsequent analysis instrument is further improved.

In some embodiments, referring to fig. 1, an insulating plug 1031 is preset in the threaded hole 103, the insulating plug 1031 is screwed with the threaded hole 103, and the insulating plug 1031 is located between the first insulating surface 101 and the second insulating surface 102. When the insulating plug 1031 is used, the insulating plug 1031 in the threaded hole 103 which is required to be connected with the gas circuit connector 301 is screwed out, and the unused threaded holes 103 still keep the connection state of the insulating plug 1031, so that the sealing performance and the insulating reliability of the cavity are ensured.

Specifically, referring to fig. 1, both ends of the sleeve 100 are provided with external threads 104, both ends of the sleeve 100 are screwed with clamping nuts 105 based on the external threads 104, and the plurality of ion lens modules 200 and the plurality of gas path lens modules 300 are fastened based on the clamping nuts 105. After the ion lens modules 200 and the gas path lens modules 300 are sleeved on the sleeve 100, the ion lens modules 200 or the gas path lens modules 300 arranged at the two ends are respectively pushed by the clamping nuts 105 screwed at the two ends, so that the ion lens modules 200 and the gas path lens modules 300 can be clamped into a whole, and the assembly is simple and reliable.

In some possible implementations, referring to fig. 1, a plurality of insulating spacers 400 are sleeved on the sleeve 100 at intervals, and at least one insulating spacer 400 is sandwiched between adjacent ion lens modules 200, between adjacent ion lens modules 200 and gas path lens modules 300, and between adjacent gas path lens modules 300. Thorough insulation between adjacent modules can be ensured by providing the insulating spacers 400 in cooperation with the second insulating surface 102, thereby avoiding leakage conduction and loss of differential properties of voltages of the adjacent modules.

As an embodiment of the insulating spacer 400, referring to fig. 1 and 2, the insulating spacer 400 includes a first insulating sleeve 401 and a second insulating sleeve 402; wherein the first insulating sleeve 401 is adapted to be sleeved on the sleeve 100; the second insulating sleeve 402 is adapted to be sleeved on the sleeve 100, and an elastic element 403 is arranged between the second insulating sleeve 401 and the first insulating sleeve. By providing the elastic member 403 to apply elastic pushing forces to the first insulating bush 401 and the second insulating bush 402 which are far away from each other, not only can the insulating spacer 400 form reliable support between adjacent modules, but also different installation gaps can be adapted, thereby improving structural versatility.

Specifically, in the present embodiment, the first insulating sleeve 401 is provided with a first annular land 4011 toward the outer peripheral edge of the second insulating sleeve 402, and the second insulating sleeve 402 is provided with a second annular land 4021 toward the inner peripheral edge of the first insulating sleeve 401; wherein the opposite side walls of the first insulating sleeve 401 and the second insulating sleeve 402 enclose a compression cavity 404 based on the first annular table 4011 and the second annular table 4021, and the elastic element 403 is disposed in the compression cavity 404. The elastic member 403 can be held in the compression chamber 404 by the first stage 4011 and the second stage 4021, so that the elastic member 403 is prevented from being deformed or exposed, and structural insulation reliability is improved.

For example, as shown in fig. 2, the elastic element 403 is a disc spring, the disc spring is sleeved on the second annular table 4021, and the outer periphery of the disc spring abuts against the inner annular surface of the first annular table 4011. The disc spring occupies a small space and has a large elastic modulus, and the assembly stability can be improved by utilizing the inner annular surface of the first annular table 4011 and the inner annular surface constraint of the second annular table 4021.

It should be understood that in the present embodiment, the sleeve 100 is an integrally formed insulating sleeve 100. Specifically, the sleeve 100 structure with corresponding inner diameter and outer diameter can be formed by machining with insulating resin or bakelite, and then the threaded hole 103 is machined, so that the machining is simple and the cost is low.

Based on the same inventive concept, as will be understood with reference to fig. 1 and 2, the embodiment of the application further provides a gas-phase molecular ionization cavity device, which comprises the insulating sealing structure.

Compared with the prior art, the gas-phase molecular ionization cavity device provided by the embodiment adopts the sleeve 100 as a connection basis of the ion lens module 200 and the gas-path lens module 300, so that the interiors of the ion lens module 200 and the gas-path lens module 300 can form a closed insulating cavity based on the first insulating surface 101, and the loss caused by collision between the parent ion or product ion signal and the metal electrode surface of the ion lens module 200 in the ionization reaction process can be avoided, thereby improving the ion signal intensity of gas-phase product ions, and being beneficial to improving the separation efficiency and the detection sensitivity; in addition, the second insulating surface 102 can ensure that the ion lens modules 200 and/or the gas path lens modules 300 which are arranged on the sleeve 100 at intervals are isolated from each other, so that voltage signals between the ion lens modules 200 are prevented from interfering with each other, on the basis, the sealing effect of the sleeve 100 can prevent the gap between the ion lens modules 200 and/or the gas path lens modules 300 from generating air leakage phenomenon, the vacuum degree required by gas phase molecular ionization is favorably maintained, the pollution caused by the penetration of external air into an insulating cavity is avoided, and the detection accuracy of a subsequent analysis instrument is further improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (9)

1. The insulation sealing structure is characterized by comprising a sleeve, wherein the inner peripheral wall of the sleeve forms a first insulation surface, and the outer peripheral wall of the sleeve forms a second insulation surface; the sleeve is provided with a plurality of threaded holes at intervals along the axial direction of the sleeve, and each threaded hole is communicated with the inner cavity of the sleeve; the sleeve is suitable for sleeving and fixing a plurality of ion lens modules and a plurality of gas path lens modules, and the gas path connector of each gas path lens module is respectively in threaded fit with one of the threaded holes.

2. The insulating seal of claim 1, wherein an insulating plug is provided in said threaded bore, said insulating plug is threadably engaged with said threaded bore, and said insulating plug is positioned between said first insulating surface and said second insulating surface.

3. The insulating sealing unit according to claim 1, wherein both ends of the sleeve are provided with external threads, both ends of the sleeve are screwed with clamping nuts based on the external threads, and a plurality of the ion lens modules and a plurality of the gas path lens modules are fastened based on the clamping nuts.

4. The insulating seal of claim 3, wherein said sleeve is provided with a plurality of insulating spacers, and at least one insulating spacer is interposed between adjacent ones of said ion lens modules, between adjacent ones of said ion lens modules and said gas path lens modules, and between adjacent ones of said gas path lens modules.

5. The insulating seal structure of claim 4, wherein said insulating spacer comprises:

The first insulating sleeve is suitable for being sleeved on the sleeve;

The second insulating sleeve is suitable for being sleeved on the sleeve, and an elastic element is arranged between the second insulating sleeve and the first insulating sleeve.

6. The insulating seal of claim 5, wherein said first insulating sleeve has a first annular land toward an outer peripheral edge of said second insulating sleeve, said second insulating sleeve has a second annular land toward an inner peripheral edge of said first insulating sleeve; the side walls of the first insulating sleeve and the second insulating sleeve, which are opposite, are based on the first annular table and the second annular table to form a compression cavity, and the elastic element is arranged in the compression cavity.

7. The insulating seal unit according to claim 6, wherein said elastic member is a disc spring, said disc spring is sleeved on said second annular table, and an outer periphery of said disc spring abuts against an inner annular surface of said first annular table.

8. The insulating seal formation of any one of claims 1 to 7, wherein said sleeve is an integrally formed insulating sleeve.

9. A gas phase molecular ionization chamber device comprising an insulating sealing structure according to any one of claims 1 to 8.