SF6 barometer calibration device

Abstract

The invention relates to an SF6 barometer calibration device. The SF6 barometer verification device comprises an installation part, a connection assembly, a control valve, an air pressure verification meter and an air collection assembly, the installation part is provided with an air inlet, an air outlet and a transmission channel, and the air inlet and the air outlet are both communicated with the transmission channel. The connecting assembly comprises a first connecting unit and a second connecting unit, the first connecting unit is installed at the air inlet, the second connecting unit is used for being installed at a detection port of the SF6 air pressure gauge, and the first connecting unit and the second connecting unit are detachably connected. The control valve is installed on the installation part and used for controlling opening and closing of the transmission channel or adjusting the flow of the transmission channel. And the air pressure calibration meter is mounted on the mounting piece and is used for measuring the flow change condition of the SF6 gas in the transmission channel. The gas collecting assembly is connected with the gas outlet and used for collecting waste gas. The SF6 barometer verification device provided by the invention has the advantages of high safety and high efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to a SF6 gas pressure meter calibration device. Background Art

[0002] With the development and construction of smart grids, SF6 switches, GIS (gas insulated switchgear), transformers and other equipment have been widely used. Therefore, the calibration workload of SF6 gas pressure meters in these devices has gradually increased.

[0003] Especially during the calibration process of the SF6 pressure gauge, it is often necessary to manually take out the SF6 gas for testing, which poses a great safety risk to the operators. Moreover, the steps of manual gas sampling and calibration are cumbersome and the errors are large, which seriously affects the safety performance and use effect of the SF6 pressure gauge, and has the defects of low safety, low reliability and low calibration efficiency. Summary of the Invention

[0004] Based on this, it is necessary to provide an SF6 gas pressure gauge calibration device to address the problems of low safety, low reliability and low calibration efficiency in SF6 gas pressure gauge calibration.

[0005] The present invention provides an SF6 gas pressure gauge calibration device, comprising:

[0006] A mounting member, wherein the mounting member is provided with an air inlet, an air outlet, and a transmission channel, wherein the air inlet and the air outlet are both in communication with the transmission channel;

[0007] A connecting assembly, the connecting assembly comprising a first connecting unit and a second connecting unit, the first connecting unit being mounted on the air inlet, the second connecting unit being used to be mounted on a detection port of an SF6 gas pressure gauge, the first connecting unit and the second connecting unit being detachably connected;

[0008] A control valve, mounted on the mounting member, for controlling the opening and closing of the transmission channel or adjusting the flow rate of the transmission channel;

[0009] An air pressure calibration meter, the air pressure calibration meter being mounted on the mounting member and being used to measure flow rate changes of SF6 gas in the transmission channel;

[0010] and a gas collecting component connected to the gas outlet.

[0011] In one embodiment, the gas collection assembly includes an gas collection bag and a connecting pipe, one end of the connecting pipe is connected to the gas outlet, and the other end of the connecting pipe is connected to the gas collection bag.

[0012] In one embodiment, the control valve includes a valve seat, a valve stem and a valve core, the valve seat is mounted on the mounting member, the valve seat is provided with a valve cavity, the valve cavity is communicated with the transmission channel, the valve core is movably arranged in the valve cavity, the valve stem is connected to the valve core, and the valve stem is movably connected to the inner wall of the valve cavity so that the valve stem drives the valve core to close or open the transmission channel.

[0013] In one embodiment, the first connecting unit includes a first connecting member and a first quick-release member, the first quick-release member is connected to the first connecting member, and the first connecting member is connected to the air inlet of the mounting member.

[0014] In one embodiment, the first connecting member is connected to the mounting member via a first threaded pair.

[0015] In one embodiment, the second connecting unit includes a second connecting piece and a second quick-release piece, the second quick-release piece is connected to the second connecting piece, the first connecting piece is used to connect to the detection port of the SF6 gas pressure gauge, and the first quick-release piece and the second quick-release piece are detachably connected.

[0016] In one embodiment, the second connecting member is connected to the SF6 gas pressure gauge via a second threaded pair; or, the second connecting member is a connecting flange, and the connecting flange is connected to the SF6 gas pressure gauge via a fastener.

[0017] In one embodiment, the first quick-release member includes a first fixed seat and a first movable member, the first fixed seat is provided with an air inlet channel, the first fixed seat is connected to the first connecting member, the inner side wall of the first fixed seat is provided with a movable elastic protrusion, the first movable member is movably arranged at an end of the first fixed seat away from the first connecting member, and a first elastic member is provided between the first fixed seat and the first movable member; the second quick-release member includes a second fixed seat, an inner core, and a second movable member, the second fixed seat is provided with an air outlet channel, the second fixed seat is connected to the second connecting member, the inner core is movably arranged in the air outlet channel, a second elastic member is provided between the inner core and the second fixed seat, a groove is provided on the outer side wall of the second fixed seat, the second movable member is provided on the outer side wall of the second fixed seat, and a third elastic member is provided between the second movable member and the second fixed seat; when the first quick-release member and the second quick-release member are connected, the end of the second fixed seat away from the second connecting member is provided in the air inlet channel, the elastic protrusion is locked in the groove, the first movable member abuts against the second movable member, and the inner core abuts against the first fixed seat, so that the air outlet channel is connected to the air inlet channel.

[0018] In one embodiment, the first connecting member and the first quick-release member are connected by a third thread pair, and a first sealing ring is provided at the connection between the first connecting member and the first quick-release member; the second connecting member and the second quick-release member are connected by a fourth thread pair, and a second sealing ring is provided at the connection between the second connecting member and the second quick-release member.

[0019] In one embodiment, the inner diameter of the connecting tube is greater than 8 mm.

[0020] The above-mentioned SF6 pressure gauge calibration device is connected to the detection port of the SF6 pressure gauge by connecting the second connecting unit to the first connecting unit and the mounting part. The transmission channel of the mounting part is connected to the control valve and the pressure calibration table, and the first connecting unit and the second connecting unit can be quickly connected. When calibrating the SF6 pressure gauge, the first connecting unit and the second connecting unit are quickly connected, and then the control valve is adjusted so that the SF6 gas is input into the transmission channel through the SF6 pressure gauge. The SF6 pressure gauge is calibrated according to the pressure calibration table. The output SF6 gas is output to the gas collection component through the gas outlet and collected to prevent the SF6 gas from leaking into the air. After the calibration is completed, the first connecting unit and the second connecting unit can be quickly disassembled. This embodiment can quickly calibrate the SF6 pressure gauge through the rapid disassembly and assembly of the first connecting unit and the second connecting unit, and the SF6 pressure gauge calibration device can be directly calibrated according to the control valve and the pressure calibration table, without the need for manual gas extraction, thus avoiding the risk of gas poisoning. The overall operation is simple, the calibration accuracy is high, and it has the advantages of high safety and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the SF6 gas pressure gauge calibration device described in an embodiment of the present application.

[0022] Figure 2 This is a schematic cross-sectional view of the SF6 gas pressure gauge calibration device described in an embodiment of the present application.

[0023] Figure 3 This is a schematic cross-sectional structural diagram of the connection assembly of the SF6 gas pressure gauge calibration device described in an embodiment of the present application.

[0024] Figure Number:

[0025] 100, mounting member; 100A, air inlet; 100B, air outlet; 100C, transmission channel;

[0026] 200, connecting assembly; 210, first connecting unit; 211, first connecting member; 212, first quick-release member; 2121, first fixing seat; 2122, first movable member; 2123, elastic protrusion; 2124, first elastic member; 213, first sealing ring; 220, second connecting unit; 221, second connecting member; 222, second quick-release member; 2221, second fixing seat; 2221A, groove; 2222, inner core; 2223, second movable member; 2224, second elastic member; 2225, third elastic member; 223, second sealing ring;

[0027] 300, control valve; 310, valve seat; 310A, valve cavity; 320, valve stem; 330, valve core;

[0028] 400, air pressure calibration table;

[0029] 500, gas collection assembly; 510, gas collection bag; 520, connecting pipe;

[0030] 10. SF6 gas pressure gauge; 10A. Test port. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0037] See Figure 1 and Figure 2, shows a structural schematic diagram of an SF6 barometer calibration device in an embodiment of the present application, the SF6 barometer calibration device includes a mounting member 100, a connecting assembly 200, a control valve 300, a barometer 400 and a gas collecting assembly 500, the mounting member 100 is provided with an air inlet 100A, an air outlet 100B and a transmission channel 100C, and the air inlet 100A and the air outlet 100B are both connected to the transmission channel 100C.

[0038] The connecting assembly 200 includes a first connecting unit 210 and a second connecting unit 220. The first connecting unit 210 is installed at the air inlet 100A, and the second connecting unit 220 is used to be installed at the detection port 10A of the SF6 gas pressure gauge 10. The first connecting unit 210 and the second connecting unit 220 are detachably connected.

[0039] The control valve 300 is mounted on the mounting member 100 , and the control valve 300 is used to control the opening and closing of the transmission channel 100C or adjust the flow of the transmission channel 100C.

[0040] The air pressure calibration meter 400 is installed on the mounting member 100 , and the air pressure calibration meter 400 is used to measure the flow rate change of the SF6 gas in the transmission channel 100C.

[0041] The gas collecting assembly 500 is connected to the gas outlet 100B, and the gas collecting assembly 500 is used to collect the exhaust gas passing through the SF6 gas pressure gauge calibration device.

[0042] The SF6 barometer calibration device described in the embodiment of the present application is configured by connecting the second connecting unit 220 to the detection port 10A of the SF6 barometer 10, and then connecting the first connecting unit 210 to the mounting member 100. The transmission channel 100C of the mounting member 100 is connected to the control valve 300 and the barometer 400, and the first connecting unit 210 and the second connecting unit 220 can be quickly connected.

[0043] When calibrating the SF6 gas pressure gauge 10, the first connecting unit 210 and the second connecting unit 220 are quickly connected. The control valve is then adjusted to allow SF6 gas to be input into the transmission channel 100C through the SF6 gas pressure gauge 10. The SF6 gas pressure gauge 10 is then calibrated according to the pressure calibration table 400. The output SF6 gas is then output through the gas outlet 100B to the gas collection assembly 500 for collection, preventing SF6 gas from leaking into the air. After the calibration is complete, the first connecting unit 210 and the second connecting unit 220 can be quickly disassembled.

[0044] The SF6 barometer calibration device described in the embodiment of the present application can quickly connect to the SF6 barometer 10 through the rapid assembly and disassembly of the first connection unit 210 and the second connection unit 220, ensuring the accuracy and reliability of the initial state, alarm, and locking functions of the SF6 barometer 10, thereby providing protection for the commissioning of the SF6 barometer 10. Moreover, the SF6 barometer calibration device can be directly calibrated based on the control valve 300 and the barometer 400, eliminating the need for manual gas extraction and avoiding the risk of gas poisoning. The overall operation is simple, the calibration accuracy is high, and it has the advantages of high safety and high efficiency.

[0045] In some embodiments, as Figure 1 As shown, the gas collecting assembly 500 includes an air collecting bag 510 and a connecting pipe 520 . One end of the connecting pipe 520 is connected to the gas outlet 100B, and the other end of the connecting pipe 520 is connected to the air collecting bag 510 .

[0046] In this embodiment, the gas collecting bag 510 and the mounting member 100 are connected by a connecting tube 520. When the SF6 gas output for use is verified, the waste SF6 gas can be output to the gas collecting bag 510 through the gas outlet 100B and collected, thereby preventing the SF6 gas from being released into the air to cause environmental pollution and avoiding safety risks to operators. It has the advantages of good safety and low pollution.

[0047] In an optional embodiment, the inner diameter of the connecting tube 520 is greater than 8 mm. To ensure the gas collection effect of the gas collection assembly 500, the inner diameter of the connecting tube 520 used must be greater than 8 mm to prevent SF6 gas from being blocked in the connecting tube 520, affecting the sealing performance and service life of the connecting tube 520.

[0048] In an optional embodiment, the gas collecting bag 510 and the connecting tube 520 are made of rubber material. The rubber material has good sealing properties and can ensure the sealing of the gas collecting assembly 500.

[0049] In an optional embodiment, if Figure 2 As shown, the control valve 300 includes a valve seat 310, a valve stem 320 and a valve core 330. The valve seat 310 is installed on the mounting member 100. The valve seat 310 is provided with a valve cavity 310A. The valve cavity 310A is communicated with the transmission channel 100C. The valve core 330 is movably arranged in the valve cavity 310A. The valve stem 320 is connected to the valve core 330. The valve stem 320 is movably connected to the inner wall of the valve cavity 310A so that the valve stem 320 drives the valve core 330 to close or open the transmission channel 100C.

[0050] The control valve 300 of this embodiment installs the valve seat 310 on the mounting member 100, so that the valve cavity 310A of the valve seat 310 is connected to the transmission channel 100C. The valve core 330 moves within the valve cavity 310A, and the valve stem 320 drives the valve core 330, which can cut off or connect the transmission channel 100C, thereby controlling the opening, closing, or adjustment of the flow rate of the transmission channel 100C of the entire SF6 pressure gauge calibration device. Because the pressure calibration gauge 400 is connected to the transmission channel 100C, when the transmission channel 100C is connected, SF6 gas passes through the transmission channel 100C to the pressure calibration gauge 400 for calibration. The control valve 300 can achieve precise control of the flow rate of SF6 gas in the SF6 pressure gauge calibration device while ensuring sealing, thereby improving the overall effectiveness of the calibration work.

[0051] In an optional embodiment, if Figure 2 As shown, valve core 330 is a needle-type valve core, which achieves precise flow control and good sealing performance. The tip of the needle-type valve core is a cone, which can be accurately inserted into the transmission channel 100C of the mounting member 100. As the valve core 330 rotates, the gap between the cone and the mounting member 100 gradually changes, thereby accurately controlling the flow of SF6 gas.

[0052] Further, such as Figure 2 As shown, the valve core 330 and the valve stem 320 are integrally formed, the valve stem 320 is provided with a first thread, and the valve seat 310 is provided with a second thread. Through the cooperation of the first thread and the second thread, the valve core 330 is moved up and down or rotated, thereby controlling the opening and closing of the valve. The threaded connection ensures the accuracy and stability of the movement of the valve core 330 on the valve seat 310, reduces the risk of leakage at the connection part, and is also convenient for processing and installation.

[0053] In an optional embodiment, if Figure 2 As shown, the first connecting unit 210 includes a first connecting member 211 and a first quick release member 212 . The first quick release member 212 is connected to the first connecting member 211 , and the first connecting member 211 is connected to the air inlet 100A of the mounting member 100 .

[0054] Furthermore, the second connecting unit 220 includes a second connecting piece 221 and a second quick-release piece 222, the second quick-release piece 222 is connected to the second connecting piece 221, the first connecting piece 211 is used to connect to the detection port 10A of the SF6 gas pressure gauge 10, and the first quick-release piece 212 and the second quick-release piece 222 are detachably connected.

[0055] In this embodiment, the first connecting unit 210 connects the first quick-release part 212 to the mounting part 100 via the first connecting member 211, and the second connecting unit 220 connects the second quick-release part 222 to the SF6 gas pressure gauge 10 via the second connecting member 221. When the SF6 gas pressure gauge calibration device needs to be calibrated, the first quick-release part 212 can be quickly connected to the second quick-release part 222 without the need for additional tools. After the calibration is completed, the first quick-release part 212 and the second quick-release part 222 can also be quickly disassembled and separated, which has the advantages of convenient use and improved efficiency.

[0056] In an optional embodiment, if Figure 2 As shown, the first connector 211 is connected to the mounting member 100 via a first threaded pair. The second connector 221 is connected to the SF6 barometer 10 via a second threaded pair. The first threaded pair ensures a tight connection between the first connector 211 and the mounting member 100. Similarly, the second threaded pair ensures a tight connection between the second connector 221 and the SF6 barometer 10, ensuring stable and safe use of the SF6 barometer calibration device.

[0057] In other embodiments, if the detection port 10A of the SF6 pressure gauge 10 is a flange, the second connecting member 221 can be selected as the second connecting unit 220 of the connecting flange, so that the connecting flange and the SF6 pressure gauge 10 are connected by fasteners to ensure that SF6 gas is transmitted stably and safely through the second connecting unit 220.

[0058] In an optional embodiment, if Figure 3 As shown, the first connecting member 211 and the first quick-release member 212 are connected by a third thread pair, and a first sealing ring 213 is provided at the connection between the first connecting member 211 and the first quick-release member 212; the second connecting member 221 and the second quick-release member 222 are connected by a fourth thread pair, and a second sealing ring 223 is provided at the connection between the second connecting member 221 and the second quick-release member 222.

[0059] In this embodiment, the third thread pair can ensure a sealed connection between the first connecting member 211 and the first quick-release member 212, and the first sealing ring 213 can further enhance the sealing and stability of the connection. Similarly, the fourth thread pair can ensure a sealed connection between the second connecting member 221 and the second quick-release member 222, and the second sealing ring 223 can further enhance the sealing and stability of the connection, thereby ensuring the safety and stability of the SF6 pressure gauge calibration device during use.

[0060] In an optional embodiment, if Figure 3As shown, the first quick-release component 212 includes a first fixed seat 2121 and a first movable member 2122. The first fixed seat 2121 is provided with an air intake channel. The first fixed seat 2121 is connected to the first connecting member 211. The inner side wall of the first fixed seat 2121 is provided with a movable elastic protrusion 2123. The first movable member 2122 is movably arranged at one end of the first fixed seat 2121 away from the first connecting member 211. A first elastic member 2124 is provided between the first fixed seat 2121 and the first movable member 2122.

[0061] Furthermore, if Figure 3 As shown, the second quick-release component 222 includes a second fixed seat 2221, an inner core 2222 and a second movable component 2223. The second fixed seat 2221 is provided with an air outlet channel. The second fixed seat 2221 is connected to the second connecting component 221. The inner core 2222 is movably arranged in the air outlet channel. A second elastic component 2224 is provided between the inner core 2222 and the second fixed seat 2221. The outer wall of the second fixed seat 2221 is provided with a groove 2221A. The second movable component 2223 is provided on the outer wall of the second fixed seat 2221. A third elastic component 2225 is provided between the second movable component 2223 and the second fixed seat 2221.

[0062] The first quick-release member 212 and the second quick-release member 222 of this embodiment are used in conjunction with each other. The end of the second quick-release member 222 can be inserted into the first quick-release member 212 to form a sealed connection. The gas outlet channel is connected to the gas inlet channel, allowing SF6 gas to flow through the first quick-release member 212 and the second quick-release member 222 to the transmission channel 100C of the mounting member 100, which has the advantage of convenient and fast connection.

[0063] Specifically, when the first quick-release component 212 and the second quick-release component 222 are connected, the end of the second fixing seat 2221 away from the second connecting component 221 is set in the air inlet channel, that is, the end of the second quick-release component 222 is inserted into the air inlet channel of the first quick-release component 212, so that the elastic protrusion 2123 on the inner side wall of the first quick-release component 212 is stuck in the groove 2221A, and then the first movable component 2122 and the second movable component 2223 abut against each other, and the inner core 2222 abuts against the first fixing seat 2121, so that the inner core 2222 moves relative to the second fixing seat 2221, thereby opening the air outlet channel and connecting the air outlet channel with the air inlet channel. When the first quick-release part 212 and the second quick-release part 222 are disconnected, the elastic protrusion 2123 is controlled to withdraw from the groove 2221A and unlock, and then the second fixing seat 2221 is pushed out from the air inlet channel, and the inner core 2222 also closes the air outlet channel under the push of the second elastic part 2224, thereby achieving automatic closing when disconnected to prevent gas leakage.

[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A SF6 gas pressure gauge calibration device, characterized in that: include: A mounting member (100), the mounting member (100) being provided with an air inlet (100A), an air outlet (100B), and a transmission channel (100C), the air inlet (100A) and the air outlet (100B) both being in communication with the transmission channel (100C); A connection assembly (200), the connection assembly (200) comprising a first connection unit (210) and a second connection unit (220), the first connection unit (210) being mounted on the air inlet (100A), the second connection unit (220) being used to be mounted on the detection port (10A) of the SF6 gas pressure gauge (10), the first connection unit (210) and the second connection unit (220) being detachably connected; a control valve (300), the control valve (300) being mounted on the mounting member (100), the control valve (300) being used to control the opening and closing of the transmission channel (100C) or to adjust the flow rate of the transmission channel (100C); A gas pressure calibration meter (400), the gas pressure calibration meter (400) being mounted on the mounting member (100), the gas pressure calibration meter (400) being used to measure flow rate changes of SF6 gas in the transmission channel (100C); as well as A gas collecting assembly (500), wherein the gas collecting assembly (500) is connected to the gas outlet (100B).

2. The SF6 gas pressure gauge calibration device according to claim 1, characterized in that: The gas collection assembly (500) comprises a gas collection bag (510) and a connecting pipe (520), one end of the connecting pipe (520) is connected to the gas outlet (100B), and the other end of the connecting pipe (520) is connected to the gas collection bag (510).

3. The SF6 gas pressure gauge calibration device according to claim 1, characterized in that: The control valve (300) includes a valve seat (310), a valve stem (320) and a valve core (330), wherein the valve seat (310) is mounted on the mounting member (100), the valve seat (310) is provided with a valve cavity (310A), the valve cavity (310A) is communicated with the transmission channel (100C), the valve core (330) is movably arranged in the valve cavity (310A), the valve stem (320) is connected to the valve core (330), and the valve stem (320) is movably connected to the inner wall of the valve cavity (310A) so that the valve stem (320) drives the valve core (330) to close or open the transmission channel (100C).

4. The SF6 gas pressure gauge calibration device according to claim 1, characterized in that: The first connecting unit (210) comprises a first connecting piece (211) and a first quick-release piece (212), the first quick-release piece (212) being connected to the first connecting piece (211), and the first connecting piece (211) being connected to the air inlet (100A) of the mounting piece (100).

5. The SF6 gas pressure gauge calibration device according to claim 4, characterized in that: The first connecting member (211) is connected to the mounting member (100) via a first threaded pair.

6. The SF6 gas pressure gauge calibration device according to claim 4, characterized in that: The second connection unit (220) comprises a second connection piece (221) and a second quick-release piece (222), the second quick-release piece (222) being connected to the second connection piece (221), the first connection piece (211) being used to connect to the detection port (10A) of the SF6 gas pressure gauge (10), and the first quick-release piece (212) and the second quick-release piece (222) being detachably connected.

7. The SF6 gas pressure gauge calibration device according to claim 6, characterized in that: The second connecting member (221) is connected to the SF6 gas pressure gauge (10) via a second threaded pair; or, The second connecting member (221) is a connecting flange, and the connecting flange is connected to the SF6 gas pressure gauge (10) via a fastener.

8. The SF6 gas pressure gauge calibration device according to claim 6, characterized in that: The first quick-release member (212) comprises a first fixed seat (2121) and a first movable member (2122), the first fixed seat (2121) being provided with an air intake passage, the first fixed seat (2121) being connected to the first connecting member (211), a movable elastic protrusion (2123) being provided on an inner side wall of the first fixed seat (2121), the first movable member (2122) being movably arranged at an end of the first fixed seat (2121) away from the first connecting member (211), and a first elastic member (2124) being provided between the first fixed seat (2121) and the first movable member (2122); The second quick-release member (222) comprises a second fixed seat (2221), an inner core (2222) and a second movable member (2223); the second fixed seat (2221) is provided with an air outlet channel; the second fixed seat (2221) is connected to the second connecting member (221); the inner core (2222) is movably arranged in the air outlet channel; a second elastic member (2224) is provided between the inner core (2222) and the second fixed seat (2221); a groove (2221A) is provided on the outer wall of the second fixed seat (2221); the second movable member (2223) is provided on the outer wall of the second fixed seat (2221); and a third elastic member (2225) is provided between the second movable member (2223) and the second fixed seat (2221); When the first quick-release member (212) and the second quick-release member (222) are connected, the end of the second fixing seat (2221) away from the second connecting member (221) is arranged on the air inlet channel, the elastic protrusion (2123) is clamped in the groove (2221A), the first movable member (2122) abuts against the second movable member (2223), and the inner core (2222) abuts against the first fixing seat (2121), so that the air outlet channel is connected to the air inlet channel.

9. The SF6 gas pressure gauge calibration device according to claim 6, characterized in that: The first connecting member (211) and the first quick-release member (212) are connected via a third thread pair, and a first sealing ring (213) is provided at the connection between the first connecting member (211) and the first quick-release member (212); the second connecting member (221) and the second quick-release member (222) are connected via a fourth thread pair, and a second sealing ring (223) is provided at the connection between the second connecting member (221) and the second quick-release member (222).

10. The SF6 gas pressure gauge calibration device according to claim 2, characterized in that: The inner diameter of the connecting tube (520) is greater than 8 mm.

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