Vacuum gauge joint and vacuum gauge

Abstract

The utility model discloses a vacuum gauge joint and a vacuum gauge, relates to the technical field of vacuum measurement, and aims to solve the problems that in the prior art, when impurities of a vacuum gauge are filtered, space adaptability is poor due to the fact that a traditional filtering device is used, and convenient development of equipment is not facilitated. The vacuum gauge connector comprises a vacuum gauge connector body, a first hole and a second hole are formed in the two ends of the vacuum gauge connector body respectively, the vacuum gauge connector body is provided with an inner cavity, the first hole and the second hole are communicated through the inner cavity, the first hole, the second hole and the inner cavity form a gas circulation channel, and at least one filtering structure is arranged in the gas circulation channel. The filtering structure is provided with filtering holes, the first hole is used for communicating with a to-be-tested vacuum system to ensure the same vacuum degree with the vacuum system, and the second hole is used for installing a vacuum sensor.

Description

A vacuum gauge connector and a vacuum gauge Technical Field

[0001] This utility model relates to the field of vacuum measurement technology, and in particular to a vacuum gauge connector and a vacuum gauge. Background Technology

[0002] Vacuum degree testing is a core technological aspect ensuring process accuracy and product quality. As a core component of vacuum testing systems, vacuum gauges play an irreplaceable role in various industries due to their high-precision measurement capabilities. However, some vacuum application scenarios are contaminated with oil, particles, dust, and other pollutants. Prolonged operation in such environments can contaminate the vacuum measurement probe, thus affecting measurement accuracy. Currently, vacuum gauges commonly use polymer material filters, ceramic filters, or molecular sieve filters for impurity filtration, typically installed at the interface between the vacuum system being tested and the vacuum sensor. However, due to the size or weight of these traditional filtration devices, their spatial adaptability when integrated with the vacuum gauge is poor, hindering the development of portable equipment. Summary of the Invention

[0003] The purpose of this utility model is to provide a vacuum gauge connector and a vacuum gauge to solve the problem that the use of traditional filtration devices in existing vacuum gauges for impurity filtration results in poor spatial adaptability, which is not conducive to the convenient development of the equipment.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] In a first aspect, this utility model provides a vacuum gauge connector, including a vacuum gauge connector body, with a first hole and a second hole respectively opened at both ends of the vacuum gauge connector body. The vacuum gauge connector body has an inner cavity, and the first hole and the second hole are connected through the inner cavity. The first hole, the second hole and the inner cavity form a gas flow channel. At least one filter structure is provided in the gas flow channel, and the filter structure is provided with filter holes. The first hole is used to connect to the system under test to ensure that it has the same vacuum degree as the system under test, and the second hole is used to install a vacuum sensor.

[0006] Optionally, in the above-mentioned vacuum gauge connector, the filter structure includes a first filter structure and a second filter structure, which are threadedly connected to the first hole and the inner cavity, respectively.

[0007] Optionally, in the above-mentioned vacuum gauge connector, the filter structure further includes a third filter structure, with a retaining ring provided in the second hole, and the third filter structure is disposed in the second hole via the retaining ring.

[0008] Optionally, in the above-mentioned vacuum gauge connector, the diameter of the filter holes in the first filter structure, the second filter structure, and the third filter structure decreases sequentially.

[0009] Optionally, in the above-mentioned vacuum gauge connector, the first filter structure and the second filter structure are integrally formed.

[0010] Optionally, in the aforementioned vacuum gauge connector, the third filter structure also includes an activated carbon filter layer.

[0011] Optionally, in the above-mentioned vacuum gauge connector, the first hole is a stepped hole, the first hole includes a first hole and a second hole that are connected, one end of the filter structure has a first radial flange, the axial surface of the first radial flange abuts against the bottom surface of the second hole, the other end of the filter structure is connected to the first hole, and the outer diameter of the first radial flange is larger than the diameter of the first hole and smaller than the diameter of the second hole.

[0012] Optionally, in the above-mentioned vacuum gauge connector, the diameter of the inner cavity is smaller than the diameter of the first hole, one end of the filter structure has a second radial flange, the axial surface of the second radial flange abuts against the bottom surface of the first hole, and the other end of the filter structure is connected to the inner cavity.

[0013] Optionally, in the above-mentioned vacuum gauge connector, the second hole is a stepped hole, and a sealing ring is provided inside the stepped hole. The sealing ring is used to seal with the vacuum sensor.

[0014] Compared with existing technologies, the vacuum gauge connector provided by this utility model has a first hole and a second hole at both ends of the main body of the vacuum gauge connector, forming a gas flow channel. By directly setting a filter structure with filter holes in the gas flow channel, when the gas to be measured enters the channel through the first hole, the gas undergoes multi-directional diffusion motion through the filter holes because the filter structure is integrated inside the gas flow channel. This causes particulate pollutants to be intercepted at the filter structure by inertial collision and sieving by the filter holes. The purified gas continues to flow through the inner cavity to the vacuum sensor at the second hole. In this way, the filter structure is built into the airflow channel of the vacuum gauge connector body, and the impurity filtration function is realized by utilizing the internal space of the vacuum gauge connector body. This makes the filter device and the vacuum gauge sensing system form an integrated structure, eliminating the physical redundancy of external filters, ensuring the compactness of the equipment, and improving the space adaptability and portability of the vacuum gauge.

[0015] Secondly, this utility model provides a vacuum gauge, comprising:

[0016] Vacuum gauge connector of any of the preceding claims;

[0017] The vacuum sensor is installed in the second hole of the vacuum gauge connector.

[0018] Compared with the prior art, in the vacuum gauge provided by this utility model embodiment, the vacuum gauge connector and the vacuum sensor are assembled and integrated through a second hole. When using the vacuum gauge for measurement, gas enters the gas flow channel through the first hole of the vacuum gauge connector. After being filtered by the filter structure set in the gas flow channel, it enters the vacuum sensor to complete the system measurement. This configuration integrates gas filtration and sensing measurement functions into the vacuum gauge connector body structure, making the filter structure completely built into the vacuum gauge body. This eliminates the device redundancy caused by the external connection pipes and additional cavities required by traditional external filters, and solves the problem of poor space adaptability caused by traditional filtration devices. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 is a schematic cross-sectional view of a vacuum gauge connector provided in an embodiment of the present invention;

[0021] Figure 2 is an exploded view of a vacuum gauge connector provided in an embodiment of this utility model;

[0022] Figure 3 is a structural schematic diagram of a vacuum sensor provided in an embodiment of this utility model;

[0023] Figure 4 is a schematic diagram of the assembly structure of a vacuum gauge provided in an embodiment of this utility model;

[0024] Figure 5 is a schematic cross-sectional view of another vacuum gauge connector provided in an embodiment of this utility model;

[0025] Figure 6 is an exploded view of another vacuum gauge connector provided in an embodiment of this utility model.

[0026] Reference numerals in the attached figures: 1 is the main body of the vacuum gauge connector, 10 is the first hole, 101 is the first hole, 102 is the first hole, 11 is the second hole, 13 is the inner cavity, 14 is the filter structure, 140 is the first filter structure, 1401 is the first radial flange, 141 is the second filter structure, 1411 is the second radial flange, 142 is the third filter structure, 15 is the snap ring, and 2 is the vacuum sensor. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Please refer to Figures 1 and 4. This embodiment of the present invention provides a vacuum gauge connector, including a vacuum gauge connector body 1. The vacuum gauge connector body 1 has a first hole 10 and a second hole 11 at its two ends. The vacuum gauge connector body 1 has an inner cavity 13. The first hole 10 and the second hole 11 are connected through the inner cavity 13. The first hole 10, the second hole 11 and the inner cavity 13 constitute a gas flow channel. At least one filter structure 14 is provided in the gas flow channel. The filter structure 14 is provided with filter holes. The first hole 10 is used to connect to the system under test to introduce gas, and the second hole 11 is used to install a vacuum sensor 2.

[0033] In specific implementation: A first hole 10 and a second hole 11, connecting to the inner cavity 13, are respectively opened at both ends of the vacuum gauge connector body 1 to form a gas flow channel. A filter structure 14 with filter holes is directly installed within the gas flow channel. When the gas to be measured enters the channel through the first hole 10, because the filter structure 14 is integrated inside the gas flow channel, the gas flows through the filter holes and undergoes multi-directional diffusion. This causes particulate contaminants to be intercepted at the filter structure 14 by inertial collision and sieving by the filter holes. The purified gas continues to flow through the inner cavity 13 to the vacuum sensor 2 at the second hole 11. This configuration integrates the filter structure 14 inside the airflow channel of the vacuum gauge connector body 1, utilizing the internal space of the vacuum gauge connector body 1 to achieve impurity filtration. This makes the filter device and the vacuum gauge sensing system an integrated structure, eliminating the physical redundancy of external filters, ensuring equipment compactness, and improving the vacuum gauge's space adaptability and portability.

[0034] As one possible implementation, as shown in Figure 1, the filter structure 14 includes a first filter structure 140 and a second filter structure 141, which are threadedly connected to the first hole 10 and the inner cavity 13, respectively. Specifically, both the first filter structure 140 and the second filter structure 141 are provided with external threads, and the wall of the first hole 10 and the inner cavity 13 are provided with internal threads that mate with the first filter structure 140 and the second filter structure 141. During assembly, the first filter structure 140 is inserted into the first hole 10 by rotating it through the threads until the end face is limited, and the second filter structure 141 is screwed into the inner cavity 13 to complete the assembly. When the gas to be tested flows through the first hole 10, coarse particulate impurities are directly intercepted by the filter holes of the first filter structure 140. When the gas continues to enter the inner cavity 13, it is further filtered by the second filter structure 141. With the above technical solution, by directly threading the first filter structure 140 and the second filter structure 141 into the vacuum gauge connector body 1, the ineffective space occupied by connecting pipes and other components of other connection methods is reduced. At the same time, the threaded connection forms a detachable connection interface, which allows for easy disassembly and replacement of the filter structure 14 for maintenance. Secondly, when tightened, the radial sealing section is formed by the pressing fit of the threaded surfaces, which ensures the sealing performance, prevents gas from leaking directly without filtration, and provides stable mechanical support to ensure that the filter structure 14 does not shift under the impact of airflow.

[0035] Further, as shown in Figure 1, the filter structure 14 also includes a third filter structure 142. A retaining spring 15 is provided inside the second hole 11, and the third filter structure 142 is positioned inside the second hole 11 via the retaining spring 15. Specifically, an annular groove is machined on the inner wall of the second hole 11, and the retaining spring 15 is embedded in the groove to form a circumferential limiting track. The third filter structure 142 enters the second hole 11 through axial insertion, and its edge abuts against the retaining spring 15 to achieve positioning and locking. During assembly, the retaining spring 15 is first pre-installed into the annular groove of the second hole 11, and then the third filter structure 142 is pushed axially into the second hole 11 until it is blocked and fixed by the retaining spring 15. During operation, the gas filtered by the first filter structure 140 and the second filter structure 141 enters the second hole 11 and undergoes a third layer of filtration by the third filter structure 142, intercepting contaminants and impurities to ensure that the gas reaching the vacuum sensor 2 is clean. The design of the third filter structure 142 further enhances the filtration capacity; at the same time, the retaining ring 15 fixing structure forms an elastic limiting interface, improving the airtightness of the device, and the third filter structure 142 can be replaced by direct plugging and unplugging, eliminating the need for disassembly during maintenance and improving maintenance efficiency. In some embodiments, the retaining ring 15 can be designed as an elastically deformable open C-shaped ring, facilitating tool clamping and disassembly.

[0036] Furthermore, the diameters of the filter pores in the first filter structure 140, the second filter structure 141, and the third filter structure 142 decrease sequentially. By arranging the first filter structure 140, the second filter structure 141, and the third filter structure 142 sequentially in the vacuum gauge connector, the diameter gradient of each filter pore decreases progressively. The first filter structure 140 is located at the beginning of the airflow and has the largest filter pore diameter; the second filter structure 141 is centrally located and has the next largest filter pore diameter; and the third filter structure 142 is adjacent to the inlet of the vacuum sensor 2 and has the smallest pore diameter. During operation, the gas to be measured first passes through the first filter structure 140 to intercept and filter larger solid particles, then flows through the second filter structure 141 to block and intercept medium-sized impurities, and finally the third filter structure 142 filters out residual small contaminants. The arrangement of filter structures 14 with decreasing pore size forms a comprehensive filtration and protection system, enabling each stage of filter structure 14 to specifically capture pollutants within a specific particle size range, preventing impurities from penetrating to the end sensor and causing contamination. At the same time, the larger pores in the upstream filter stage block larger impurity particles, reducing the filtration load on the downstream filter structure 14, effectively slowing down the clogging rate of the filter structure 14, reducing the frequency of maintenance and replacement, and improving work efficiency.

[0037] In some embodiments, the filter pores in the filter structure 14 can be arranged in a circular micropore array or a hexagonal honeycomb filter to achieve a gradient decrease in pore size. Alternatively, a one-way airflow valve can be designed to ensure that pollutants do not flow back.

[0038] As one possible implementation, as shown in Figure 1, the first hole 10 is a stepped hole, comprising a first hole 101 and a first second hole 102 that are connected. One end of the filter structure 14 has a first radial flange 1401, the axial surface of which abuts against the bottom surface of the first second hole 102. The other end of the filter structure 14 is connected to the first hole 101. The outer diameter of the first radial flange 1401 is larger than the diameter of the first hole 101 and smaller than the diameter of the first second hole 102. During assembly, the filter structure 14 is axially pushed into the first hole 101 at the first second hole 102, so that the first radial flange 1401 of the filter structure 14 abuts against the bottom surface of the first second hole 102. Size constraints are used to limit the movement, thus completing the assembly. During operation, gas flows along the gas flow channel through the filter structure 14. When the gas flows to the first hole 10, the gas is difficult to leak through the assembly gap between the filter structure 14 and the first hole 102 because the first radial flange 1401 of the filter structure 14 is in close contact with the bottom surface of the first hole 102. The contact between the first radial flange 1401 of the filter structure 14 and the stepped hole ensures the airtightness of the device and improves the feasibility of filtration. At the same time, when the filter structure 14 and the first hole 10 are detachably connected, disassembly can be easily and quickly completed by clamping the first radial flange 1401 at the first hole 102 during maintenance.

[0039] In some embodiments, as shown in FIG1, the diameter of the inner cavity 13 is smaller than the aperture of the first hole 10, one end of the filter structure 14 has a second radial flange 1411, the axial surface of the second radial flange 1411 abuts against the bottom surface of the first hole 10, and the other end of the filter structure 14 is connected to the inner cavity 13.

[0040] Specifically, the diameter of the inner cavity 13 of the vacuum gauge connector body 1 is configured to be smaller than the diameter of the first hole 10. A second radial flange 1411 is provided on the filter structure 14, the axial end face of which abuts against the stepped bottom surface of the first hole 10, and the main body of the filter structure 14 extends to it. During assembly, the filter structure 14 is pushed axially along the first hole 10, so that the end face of the second radial flange 1411 presses tightly against the stepped bottom surface of the first hole 10, and at the same time, the main body of the filter structure 14 and the inner cavity 13 form a mating connection. During operation, the gas to be measured flows through the first hole 10 and then enters the inner cavity 13 through the filter structure 14. With this configuration, the sealing interface formed by the second radial flange 1411 and the stepped surface prevents radial leakage of the airflow, while the main body of the filter structure 14 intercepts impurities in the inner cavity 13 section for filtration. The second radial flange 1411 of the filter structure 14 abuts against the bottom surface of the first hole 10, ensuring the airtightness of the device and improving the feasibility of filtration. At the same time, with the filter structure 14 and the inner cavity 13 being detachably connected, disassembly can be easily and quickly completed by simply clamping the second radial flange 1411 at the first hole 10 during maintenance.

[0041] As one possible implementation, as shown in Figure 1, the second hole 11 is a stepped hole, and a sealing ring is installed inside the second hole 11 for sealing with the vacuum sensor 2. Specifically, the second hole 11 of the vacuum gauge connector body 1 is configured as a stepped hole structure, which includes axially connected sections of different diameters. An annular sealing groove is opened at the step transition, and the sealing ring is embedded in the groove to form a radially raised interface. When installing the vacuum sensor 2, the sensor tube is pushed axially along the stepped hole, so that the outer wall of the sensor end forms an interference contact with the sealing ring. During assembly, the detection end of the vacuum sensor 2 extends into the stepped hole, and the elastic body of the sealing ring is radially compressed and deformed, tightly filling the microscopic gap between the sensor and the hole wall, blocking the gas leakage channel. With this configuration, the sealing ring is compressed and deformed at the stepped hole to generate continuous pressure, ensuring the reliability of the seal under gas fluctuations.

[0042] As one possible implementation, the first filter structure 140 and the second filter structure 141 are integrally formed. For example, both the first filter structure 140 and the second filter structure 141 are formed integrally using a metal sintering process. The outer edges of the first filter structure 140 and the second filter structure 141 are respectively provided with threaded structures for threaded engagement with the first hole 10 and the inner cavity 13. During installation, they are assembled and sealed using threaded connections. During operation, gas flows sequentially through the first filter structure 140 and the second filter structure 141. Due to the integral design of the first filter structure 140 and the second filter structure 141, there are no connecting gaps, avoiding the leakage risk of traditional split structures at the joint surfaces. Simultaneously, the integrally formed structure provides uniform mechanical strength, effectively resisting structural instability caused by airflow impact.

[0043] As one possible implementation, the third filter structure 142 also includes an activated carbon filter layer. Specifically, an activated carbon filter layer is added to the main structure of the third filter structure 142. The activated carbon filter layer is located downstream of the airflow in the third filter structure 142. When the gas flows through, the third filter structure 142 first intercepts solid particulate matter, and then the activated carbon filter layer captures molecular-level pollutants through its own adsorption mechanism, further improving the filtration effect.

[0044] For example, the first filter structure 140 and the second filter structure 141 can be made of stainless steel. The first filter structure 140 and the second filter structure 141 may include a multi-layer stainless steel wire mesh sintered filter element, a vacuum suction cup brass filter exhaust sheet, a CNC suction cup filter screen, etc. The third filter structure 142 can be made of nanofiber composite material. The third filter structure 142 may include an activated carbon filter layer, micro-nano metal mesh, nickel foam, etc. Stainless steel has high strength and good corrosion resistance, ensuring that it does not deform under airflow impact, reducing maintenance and replacement frequency and improving working efficiency. Nanofiber composite material can be combined with various materials, such as activated carbon, to achieve further filtration and improve the filtration effect.

[0045] In some embodiments, the first filter structure 140, the second filter structure 141, and the third filter structure 142 may all be made of nanofiber composite materials, stainless steel materials, or other metal-based composite materials with filter pores.

[0046] As shown in Figures 3 and 4, this embodiment of the specification also provides a vacuum gauge, including any of the above-mentioned vacuum gauge connectors and a vacuum sensor 2, wherein the vacuum sensor 2 is installed in the second hole 11 of the vacuum gauge connector.

[0047] Compared with the prior art, in the vacuum gauge provided by this embodiment, the vacuum gauge connector and the vacuum sensor 2 are assembled and integrated through the second hole 11. When using the vacuum gauge for measurement, the gas enters the gas flow channel through the first hole 10 of the vacuum gauge connector, and after being filtered by the filter structure 14 set in the gas flow channel, it enters the vacuum sensor 2 to complete the system measurement. In this way, the gas filtration and sensing measurement functions are integrated into the vacuum gauge connector body structure, so that the filter structure 14 is completely built into the vacuum gauge body. This eliminates the device redundancy caused by the external connection pipes and additional cavities required by traditional external filters, and solves the problem of poor space adaptability caused by traditional filtration devices.

[0048] In some embodiments, as shown in Figures 5 and 6, the vacuum gauge connector is provided with a plurality of second holes 11 for mounting vacuum sensors 2. For example, the vacuum gauge connector is provided with two second holes 11, which can simultaneously mount two vacuum sensors 2, thereby increasing the versatility of the vacuum gauge in different measurement conditions.

[0049] Although the present invention has been described herein in conjunction with various embodiments, those skilled in the art will understand and implement other variations of the disclosed embodiments by reviewing the accompanying drawings, the disclosure, and the appended claims in carrying out the claimed invention. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0050] Although the present invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the present invention. Accordingly, this specification and drawings are merely exemplary descriptions of the present invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the present invention. Clearly, those skilled in the art can make various alterations and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and modifications of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include such modifications and modifications.

Claims

1. A vacuum gauge connector, characterized in that, The device includes a vacuum gauge connector body, with a first hole and a second hole respectively at both ends. The vacuum gauge connector body has an inner cavity, through which the first hole and the second hole are connected. The first hole, the second hole, and the inner cavity form a gas flow channel. At least one filter structure is provided in the gas flow channel, and the filter structure is provided with micro-nano filter holes. The first hole is used to connect to the vacuum system to be tested to ensure that it has the same vacuum level as the vacuum system. The second hole is used to install a vacuum sensor.

2. The vacuum gauge connector according to claim 1, characterized in that, The filter structure includes a first filter structure and a second filter structure, which are threadedly connected to the first hole and the inner cavity, respectively.

3. The vacuum gauge connector according to claim 2, characterized in that, The filter structure further includes a third filter structure, wherein a retaining spring is provided in the second hole, and the third filter structure is disposed in the second hole via the retaining spring.

4. The vacuum gauge connector according to claim 3, characterized in that, The diameter of the filter holes in the first filter structure, the second filter structure, and the third filter structure decreases sequentially.

5. The vacuum gauge connector according to claim 3, characterized in that, The first filter structure and the second filter structure are integrally formed.

6. The vacuum gauge connector according to claim 3, characterized in that, The third filtration structure also includes an activated carbon filter layer.

7. The vacuum gauge connector according to claim 1, characterized in that, The first hole is a stepped hole, which includes a first hole and a second hole that are connected. One end of the filter structure has a first radial flange, the axial surface of which abuts against the bottom surface of the second hole. The other end of the filter structure is connected to the first hole. The outer diameter of the first radial flange is larger than the diameter of the first hole and smaller than the diameter of the second hole.

8. The vacuum gauge connector according to claim 1, characterized in that, The diameter of the inner cavity is smaller than the diameter of the first hole. One end of the filter structure has a second radial flange, the axial surface of which abuts against the bottom surface of the first hole. The other end of the filter structure is connected to the inner cavity.

9. The vacuum gauge connector according to claim 1, characterized in that, The second hole is a stepped hole, and a sealing ring is provided inside the second hole. The sealing ring is used to seal with the vacuum sensor.

10. A vacuum gauge, characterized in that, include: The vacuum gauge connector according to any one of claims 1-9; a vacuum sensor, wherein the vacuum sensor is installed in the second hole of the vacuum gauge connector.

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