Insulating gas pressure sensor

Abstract

The application relates to an insulating gas pressure sensor, and relates to the field of sensors.The insulating gas pressure sensor comprises a shell, a dial surface is arranged in the shell, and a pointer is rotationally connected to the dial surface; the shell is provided with a first C-shaped pipe, a second C-shaped pipe, a base and a movement, a channel is arranged in the base, the first C-shaped pipe and the second C-shaped pipe are communicated with the channel, a first temperature compensation sheet is arranged on the first C-shaped pipe, the first temperature compensation sheet is used for realizing temperature compensation of a rated pressure, the first temperature compensation sheet is connected with the movement, and the movement is used for driving the pointer to rotate; a second temperature compensation sheet is arranged on the second C-shaped pipe, the second temperature compensation sheet is used for realizing temperature compensation of a cut-off point pressure, a moving contact point is arranged on the second temperature compensation sheet, the shell is provided with an inductor, a static contact sheet is arranged on the inductor, and the inductor is electrically connected with a signal device.The application can satisfy error values of temperature compensation of the rated pressure and error values of temperature compensation of the cut-off point pressure.

Description

Technical Field

[0001] This application relates to the field of sensors, and more particularly to an insulating gas pressure sensor. Background Technology

[0002] SF6 gas has wide applications in high-voltage electrical equipment due to its excellent arc-extinguishing and insulation properties. However, both of these properties are closely related to density. When the density in the gas chamber decreases, the arc-extinguishing and insulation properties of SF6 gas deteriorate, creating potential safety hazards. Therefore, in industry, dedicated pressure sensors are often used to detect the pressure of SF6 gas. When a leak is detected, an alarm is triggered, reminding operators to replenish the gas or seal the leak under pressure in a timely manner. This prevents potential damage to electrical equipment and major accidents during operation, effectively reducing the alarm failure rate and playing a role in improving the safety of power grid operation.

[0003] The SF6 gas pressure sensor contains a flexible metal tube for connecting the gas. A temperature compensation plate is connected to the end of the metal tube, and the temperature compensation plate is connected to a mechanism. The mechanism drives a pointer to rotate on the dial to display the pressure. The pointer is equipped with a lever. The rotation of the pointer drives the lever to move. When the lever moves to contact the contact point of the housing, an alarm signal is issued.

[0004] Temperature compensation diaphragms are used for temperature compensation, and the industry standard for temperature compensation is as follows: When the instrument is filled with SF6 gas to the rated pressure, and the ambient temperature of the instrument deviates from 20°C, the instrument pointer should still indicate the rated pressure. The error of its pressure indication and the error of the signal contact action value, including the alarm pressure setting value and the lockout pressure setting value, should not be greater than the temperature compensation error value specified in the formula.

[0005] Rated pressure is the pressure at which SF6 electrical equipment operates normally over a long period of time, while alarm pressure and lockout pressure are cut-off pressures. Alarm pressure is the pressure set when the equipment needs maintenance or repair, and lockout pressure is the pressure set when the equipment cannot operate normally. Rated pressure and cut-off pressure play an important role in actual use, used to monitor and control different operating states of SF6 electrical equipment, and are related to whether SF6 electrical equipment can operate normally and safely.

[0006] Existing SF6 gas pressure sensors can only meet the error value for temperature compensation of rated pressure, and cannot simultaneously meet the error value for temperature compensation of cutoff pressure. Summary of the Invention

[0007] To address the problems existing in the above-mentioned technologies, this application provides an insulating gas pressure sensor.

[0008] The insulating gas pressure sensor provided in this application adopts the following technical solution: An insulating gas pressure sensor includes a housing with a graduated dial inside, on which a pointer is rotatably connected. The housing comprises a first C-shaped tube, a second C-shaped tube, a base, and a mechanism. A channel is formed within the base, through which both the first and second C-shaped tubes communicate. A first temperature compensation plate is mounted on the first C-shaped tube for temperature compensation at rated pressure, and is connected to the mechanism, which drives the pointer to rotate. A second temperature compensation plate is mounted on the second C-shaped tube for temperature compensation at cutoff pressure, and is mounted on the second temperature compensation plate. A sensor is located within the housing, and the sensor has a stationary contact plate for mating with the contactor. The sensor is electrically connected to a signal transmitter.

[0009] By adopting the above technical solution, the gas to be tested enters the first C-shaped tube and the second C-shaped tube through the channel. The expansion of the first and second C-shaped tubes pulls the first and second temperature compensation plates to move. The movement of the first temperature compensation plate causes the mechanism to drive the pointer to rotate on the dial, thereby displaying the pressure. The movement of the second temperature compensation plate drives the contactor to move. When the contactor moves to connect with the stationary contact, the sensor is triggered, thereby enabling the signal receiver to receive a signal and further transmit an alarm signal. In the above detection process, the first temperature compensation plate connected to the mechanism is used to achieve temperature compensation for the rated pressure. When the contactor and the stationary contact are connected, the second temperature compensation plate corrects for any deviation in the cutoff pressure, thereby satisfying the temperature compensation for the cutoff pressure.

[0010] Optionally, the contactor includes a lever disposed on the second temperature compensation plate, the lever having contact rods evenly distributed on it, and each contact rod having a moving contact; multiple sensors are disposed within the housing, each sensor having a stationary contact piece, the multiple stationary contact pieces being distributed in a stepped manner, and the position and number of the stationary contact pieces corresponding one-to-one with the moving contacts.

[0011] By adopting the above technical solution, the stationary contact pieces are tilted at different angles on the corresponding sensors, resulting in a stepped distribution. The sensors can set the tilt angle of the stationary contact pieces according to different threshold values. The expansion of the second C-shaped tube pulls the second temperature compensation piece to move. The movement of the second temperature compensation piece drives the lever to move, which in turn drives multiple contact rods to move. The movement of the multiple contact rods drives multiple moving contacts to move, and the multiple moving contacts will successively engage with the corresponding stationary contact pieces. When the first moving contact moves to engage with the corresponding stationary contact piece, the corresponding sensor is triggered, causing the signal transmitter to receive a signal. The signal transmitter will then... This signal is then transmitted. As the gas pressure gradually changes, the expansion and deformation of the second C-shaped tube gradually increases, causing the contact rod to continue moving. This causes the moving contact of the second step to contact the stationary contact, triggering the second signal. The triggering process for other signals is similar. The cooperation of the components in the above process can improve the overall applicability of the sensor, enabling the sensor to generate stepwise signal triggers based on the changes in the gas being measured. In actual operation, the first trigger signal can be set to a critical value within the safe range, the second trigger signal can be set to an alarm value, and a danger signal value for closing the gas passage can also be set, facilitating accurate gas detection.

[0012] Optionally, a movable plate is provided inside the housing, and multiple sensors are disposed on the movable plate. A fixed plate is provided inside the housing, and an eccentric wheel is rotatably connected to the fixed plate. The movable plate abuts against the eccentric wheel, and a limiting member is provided on the fixed plate to restrict the movement direction of the movable plate.

[0013] By adopting the above technical solution, when it is necessary to adjust the pressure value corresponding to the sensor signal trigger, the eccentric wheel can be rotated, thereby moving the movable plate. The limiting component restricts the movement direction of the movable plate, allowing the movable plate to move linearly. The movement of the movable plate drives multiple sensors to move, thereby causing the stationary contact piece to move. The movement of the stationary contact piece drives multiple stationary contact pieces to move, thereby adjusting the position of the stationary contact piece and changing the distance between the stationary contact piece and the corresponding moving contact point, further adjusting the pressure value corresponding to the trigger, thereby improving the applicability of the sensor.

[0014] Optionally, the limiting component includes a limiting rail disposed on the fixed plate, and a limiting block disposed on the movable plate, the limiting block being located on the limiting rail and slidably connected to the limiting rail.

[0015] By adopting the above technical solution, when the movable plate moves, the limiting block slides on the limiting rail, and the limiting rail restricts the movement direction of the limiting block, thereby restricting the movement direction of the movable plate.

[0016] Optionally, the limiting rail is provided with an adjustment scale, and the limiting block is provided with an adjustment rod corresponding to the adjustment scale.

[0017] By adopting the above technical solution, when the limit block slides on the limit rail, the value corresponding to the adjustment rod on the adjustment scale changes, thereby allowing for precise adjustment based on the adjustment scale.

[0018] Optionally, a push spring is provided on the limiting rail, and the push spring abuts against the limiting block.

[0019] By adopting the above technical solution, when the limiting block moves on the limiting rail, the pushing spring is in a compressed state, and the end of the pushing spring abuts against the limiting block, thereby preventing the limiting block from moving when the eccentric wheel is not rotating, and improving the stability of the moving plate during the movement process.

[0020] Optionally, a guide groove is provided inside the housing, a telescopic rod is provided on the lever, a guide block is provided on the telescopic rod, and the guide block is located in the guide groove and slides in cooperation with the guide groove.

[0021] By adopting the above technical solution, the movement of the lever is restricted by the cooperation of the guide block and the guide groove, so that the moving contact and the corresponding stationary contact can achieve precise docking.

[0022] Optionally, the sensor is provided with a mounting plate, and a push rod is threadedly connected to the mounting plate, the end of the push rod abutting against the corresponding stationary contact piece.

[0023] By adopting the above technical solution, the end of the push rod abuts against the stationary contact piece. By rotating the push rod, the end of the push rod can be moved out, thereby changing the tilt angle of the stationary contact piece. This allows the position of the stationary contact piece to be adjusted, thus changing the distance between the stationary contact piece and the moving contact point, thereby adjusting the pressure value corresponding to the trigger, thereby improving the overall applicability of the sensor.

[0024] Optionally, an elastic connecting piece is fixed inside the housing, and the elastic connecting piece is fixedly connected to the end of the second C-shaped tube.

[0025] By adopting the above technical solution, the elastic connecting piece is used to improve the stability of the second C-shaped tube during its movement, thereby facilitating the precise docking between the moving contact and the stationary contact piece.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The gas to be tested enters the first C-shaped tube and the second C-shaped tube through the channel. The expansion of the first and second C-shaped tubes pulls the first and second temperature compensation plates to move. The movement of the first temperature compensation plate causes the mechanism to drive the pointer to rotate on the dial, thereby displaying the pressure. The movement of the second temperature compensation plate drives the contactor to move. When the contactor moves to connect with the stationary contact, the sensor is triggered, thereby enabling the signal receiver to receive a signal and further transmit an alarm signal. In the above detection process, the first temperature compensation plate connected to the mechanism is used to achieve temperature compensation for the rated pressure. When connected to the stationary contact through the contactor, the second temperature compensation plate corrects for any deviation in the cutoff pressure, thus satisfying the temperature compensation for the cutoff pressure. 2. The sensor can generate stepwise signal triggers based on changes in the gas being measured. In actual operation, the first trigger signal can be set to a critical value within the safe range, the second trigger signal can be set to an alarm value, and a danger signal value for closing the gas passage can also be set, which facilitates accurate gas detection. 3. When it is necessary to adjust the pressure value corresponding to the sensor signal trigger, the eccentric wheel can be rotated, thereby moving the movable plate. The limiting component restricts the movement direction of the movable plate, allowing it to move linearly. The movement of the movable plate drives multiple sensors to move, which in turn moves the stationary contact piece. The movement of the stationary contact piece drives multiple stationary contact pieces to move, thereby adjusting the position of the stationary contact piece. This changes the distance between the stationary contact piece and the corresponding moving contact point, further adjusting the pressure value corresponding to the trigger, thereby improving the applicability of the sensor. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 yes Figure 1 A schematic diagram showing the assembly of various components within the inner shell; Figure 3 yes Figure 1 A cross-sectional view of the mating components within the inner shell; Figure 4 yes Figure 2 A schematic diagram from another angle, mainly used to illustrate the structure of the sensor; Figure 5 yes Figure 4 Enlarged view of section A; Figure 6 This is a schematic diagram showing the assembly of the components inside the housing in Embodiment 2; Figure 7 yes Figure 6 Enlarged view of section B; Figure 8 yes Figure 6 Enlarged view of section C; Figure 9 This is a cross-sectional view of Example 3; Figure 10 yes Figure 9 Enlarged view of section D.

[0028] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Dial; 3. Pointer; 4. First C-shaped tube; 5. Second C-shaped tube; 6. Base; 7. Mechanism; 8. Channel; 9. First temperature compensation plate; 10. Second temperature compensation plate; 11. Contactor; 111. Lever; 112. Contact rod; 113. Moving contact; 12. Sensor; 13. Stationary contact; 14. Signal device; 15. Movable plate; 16. Fixed plate; 17. 18. Eccentric wheel; 19. Limit rail; 20. Limit block; 21. Adjustment scale; 22. Adjustment rod; 23. Push spring; 24. Guide groove; 25. Telescopic rod; 26. Guide block; 27. Mounting plate; 28. Top rod; 29. ​​Silicone head; 30. Elastic connecting piece; 31. Front cover plate; 32. Rear cover plate; 33. Glass panel; 34. Positioning plate; 35. Waist-shaped hole; 36. Positioning screw; 37. Adjustment plate. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0030] Example 1 Example 1 discloses an insulating gas pressure sensor. (Refer to...) Figure 1 and Figure 2 The insulating gas pressure sensor includes a housing 1, a scale surface 2 inside the housing 1, and a pointer 3 rotatably connected to the scale surface 2; (Refer to...) Figure 3 and Figure 4 The housing 1 is provided with a first C-shaped tube 4, a second C-shaped tube 5, a base 6, and a mechanism 7. A channel 8 is opened in the base 6, and the first C-shaped tube 4 and the second C-shaped tube 5 are both connected to the channel 8. A first temperature compensation plate 9 is provided at the end of the first C-shaped tube 4 away from the base 6. The first temperature compensation plate 9 is used to achieve temperature compensation for rated pressure. The first temperature compensation plate 9 is connected to the mechanism 7, and the mechanism 7 is used to drive the pointer 3 to rotate. A second temperature compensation plate 10 is provided at the end of the second C-shaped tube 5 away from the base 6. The second temperature compensation plate 10 is used to achieve temperature compensation for cut-off pressure. A contactor 11 is provided on the second temperature compensation plate 10. The housing 1 is provided with a sensor 12. A stationary contact plate 13 is provided on the sensor 12. The sensor 12 is electrically connected to a signal device 14.

[0031] Reference Figure 1 and Figure 2Both the front cover plate 30 and the rear cover plate 31 of the housing 1 are removable. The front cover plate 30 is provided with a glass panel 32, and the scale surface 2 is located between the glass panel 32 and the rear cover plate 31. An elastic connecting piece 29 is bolted to the base 6, and the elastic connecting piece 29 is fixedly connected to the end of the second C-shaped tube 5.

[0032] Reference Figure 4 and Figure 5 The contactor 11 includes a lever 111 disposed on the second temperature compensation plate 10, with multiple contact rods 112 evenly distributed on the lever 111, and each contact rod 112 having a moving contact 113 for contacting the stationary contact plate 13; a positioning plate 33 is fixed on the base 6, and multiple sensors 12 are disposed inside the housing 1, with the multiple sensors 12 all mounted on an adjustment plate 36, and an oblong hole 34 is provided on the adjustment plate 36, through which a positioning screw 35 passes, and the positioning screw 35 is threadedly connected to the positioning plate 33; each sensor 12 is provided with a stationary contact plate 13, and the multiple stationary contact plates 13 are distributed in a stepped manner, with the position and number of the stationary contact plates 13 corresponding one-to-one with the moving contact 113; The stationary contact piece 13 is tilted at different angles on the corresponding sensor 12, resulting in a stepped distribution. The sensor can set the tilt angle of the stationary contact piece 13 according to different threshold values. The second C-shaped tube 5 expands to pull the second temperature compensation piece 10 to move. The movement of the second temperature compensation piece 10 drives the lever 111 to move. The movement of the lever 111 drives multiple contact rods 112 to move. The movement of the multiple contact rods 112 drives multiple moving contacts 113 to move. The multiple moving contacts 113 will dock with the corresponding stationary contact piece 13 one by one. When the first moving contact 113 moves to dock with the corresponding stationary contact piece 13, the corresponding sensor 12 is triggered, causing the signaler 14 to receive a signal, which the signaler 14 will then transmit. As the gas pressure gradually changes, the expansion deformation of the second C-shaped tube 5 gradually increases. The larger the pressure, the more the contact rod 112 will continue to move, causing the moving contact 113 of the second step to contact the stationary contact piece 13, triggering the second signal. The triggering process for other signals is similar, thereby improving the overall applicability of the sensor. The sensor can generate step-wise signal triggers based on the change value of the gas to be measured. In actual operation, the first trigger signal can be set to the critical value within the safe range, the second trigger signal can be set to the alarm value, and a danger signal value for closing the gas channel 8 can also be set, which facilitates accurate gas detection. When the end of the positioning screw 35 does not tighten the adjusting plate 36, the positioning screw 35 can slide in the oblong hole 34, allowing the adjusting plate 36 to slide up and down. This allows the distance between the stationary contact piece 13 and the corresponding moving contact 113 to be adjusted, thereby adjusting the pressure value corresponding to the signal trigger of the sensor.

[0033] The implementation principle of Example 1 is as follows: The gas to be tested enters the first C-shaped tube 4 and the second C-shaped tube 5 through the channel 8 of the base 6. The expansion of the first C-shaped tube 4 and the second C-shaped tube 5 pulls the first temperature compensation plate 9 and the second temperature compensation plate 10 to move. The movement of the first temperature compensation plate 9 causes the mechanism 7 to drive the pointer 3 to rotate on the dial 2, thereby displaying the pressure. The movement of the second temperature compensation plate 10 causes the moving contact 113 to move. When the moving contact 113 moves to connect with the stationary contact plate 13, the sensor 12 is triggered, thereby causing the signal device 14 to receive a signal and further transmit an alarm signal. In the above detection process, the first temperature compensation plate 9 connected to the mechanism 7 is used to realize temperature compensation for the rated pressure. When the moving contact 113 and the stationary contact plate 13 are connected, the second temperature compensation plate 10 corrects the deviation of the cutoff pressure, thereby satisfying the temperature compensation of the cutoff pressure.

[0034] Example 2 The difference between Example 2 and Example 1 is that: (Refer to...) Figure 6 and Figure 7 The housing 1 contains a movable plate 15, on which multiple sensors 12 are mounted. The housing 1 also contains a fixed plate 16, on which an eccentric wheel 17 is rotatably connected. The movable plate 15 abuts against the eccentric wheel 17. The fixed plate 16 has a limit rail 18 with an adjustment scale 20. The movable plate 15 has a limit block 19 with an adjustment rod 21 corresponding to the adjustment scale 20. The limit block 19 is located on the limit rail 18 and is slidably connected to it. The limit rail 18 has a push spring 22 that abuts against the limit block 19.

[0035] Reference Figure 6 and Figure 8 The sensor 12 is provided with a mounting plate 26, and a push rod 27 is threadedly connected to the mounting plate 26. A silicone head 28 is fixed to the end of the push rod 27, and the silicone head 28 abuts against the corresponding stationary contact piece 13.

[0036] The implementation principle of Example 2 is as follows: When it is necessary to adjust the pressure value corresponding to the signal trigger of the sensor, and when it is necessary to adjust the position of the stationary contact piece 13 on a single sensor, rotating the push rod 27 can move the silicone head 28 at the end of the push rod 27, thereby changing the tilt angle of the stationary contact piece 13, and thus changing the distance between the stationary contact piece 13 and the moving contact 113; when it is necessary to adjust the positions of multiple stationary contact pieces 13 synchronously, rotating the eccentric wheel 17, thereby moving the movable plate 15, at which time the limiting block 19 slides on the limiting rail 18, and the limiting rail 18 restricts the movement direction of the limiting block 19, thereby making The movable plate 15 can move linearly, and the movement of the movable plate 15 drives the movement of multiple sensors 12, thereby causing multiple stationary contact pieces 13 to move. This adjusts the position of the stationary contact pieces 13, changes the distance between the stationary contact pieces 13 and the corresponding moving contact 113, and further adjusts the pressure value corresponding to the trigger, thereby improving the applicability of the sensor. When the limit block 19 slides on the limit rail 18, the push spring 22 is in a compressed state, and the end of the push spring 22 abuts against the limit block 19. The value of the adjustment rod 21 on the adjustment scale 20 changes, thereby allowing for precise adjustment according to the adjustment scale 20.

[0037] Example 3 The difference between Example 3 and Example 2 is that: (Refer to...) Figure 9 and Figure 10 The housing 1 has a guide groove 23 inside, and a telescopic rod 24 is provided on the lever 111. A guide block 25 is provided on the telescopic rod 24. The guide block 25 is located in the guide groove 23 and slides in cooperation with the guide groove 23.

[0038] The implementation principle of Example 3 is as follows: the movement of the lever 111 is restricted by the cooperation of the guide block 25 and the guide groove 23, so that the moving contact 113 and the corresponding stationary contact piece 13 can achieve precise docking.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An insulating gas pressure sensor, characterized in that: The device includes a housing (1), a dial (2) inside the housing (1), and a pointer (3) rotatably connected to the dial (2); the housing (1) includes a first C-shaped tube (4), a second C-shaped tube (5), a base (6), and a movement (7); the base (6) has a channel (8), and the first C-shaped tube (4) and the second C-shaped tube (5) are both connected to the channel (8); a first temperature compensation plate (9) is provided on the first C-shaped tube (4), which is used to achieve temperature compensation for rated pressure; the first C-shaped tube (4) is provided with a first temperature compensation plate (9). A temperature compensation plate (9) is connected to the mechanism (7), and the mechanism (7) is used to drive the pointer (3) to rotate; a second temperature compensation plate (10) is provided on the second C-shaped tube (5), and the second temperature compensation plate (10) is used to realize temperature compensation of the cut-off pressure. A contactor (11) is provided on the second temperature compensation plate (10), and a sensor (12) is provided on the housing (1). A stationary contact plate (13) is provided on the sensor (12) for docking with the contactor (11). The sensor (12) is electrically connected to a signal device (14). The contactor (11) includes a lever (111) disposed on the second temperature compensation plate (10), and a plurality of contact rods (112) are evenly distributed on the lever (111), and each contact rod (112) is provided with a moving contact (113); a plurality of sensors (12) are disposed in the housing (1), and each sensor (12) is provided with a stationary contact piece (13), and the plurality of stationary contact pieces (13) are distributed in a stepped manner, and the position and number of the stationary contact pieces (13) correspond one-to-one with the moving contact (113); A movable plate (15) is provided inside the housing (1), and multiple sensors (12) are provided on the movable plate (15). A fixed plate (16) is provided inside the housing (1), and an eccentric wheel (17) is rotatably connected to the fixed plate (16). The movable plate (15) abuts against the eccentric wheel (17). A limiting member for restricting the movement direction of the movable plate (15) is provided on the fixed plate (16). The housing (1) has a guide groove (23) inside, the lever (111) is provided with a telescopic rod (24), the telescopic rod (24) is provided with a guide block (25), the guide block (25) is located in the guide groove (23) and slides in cooperation with the guide groove (23); The sensor (12) is provided with a mounting plate (26), and a push rod (27) is threadedly connected to the mounting plate (26). The end of the push rod (27) abuts against the corresponding stationary contact piece (13). The limiting component includes a limiting rail (18) disposed on the fixed plate (16), and a limiting block (19) disposed on the movable plate (15). The limiting block (19) is located on the limiting rail (18) and is slidably connected to the limiting rail (18).

2. The insulating gas pressure sensor according to claim 1, characterized in that: The limiting rail (18) is provided with an adjustment scale (20), and the limiting block (19) is provided with an adjustment rod (21) corresponding to the adjustment scale (20).

3. The insulating gas pressure sensor according to claim 1, characterized in that: A push spring (22) is provided on the limiting rail (18), and the push spring (22) abuts against the limiting block (19).

4. An insulating gas pressure sensor according to claim 1, characterized in that: An elastic connecting piece (29) is fixed inside the housing (1), and the elastic connecting piece (29) is fixedly connected to the end of the second C-shaped tube (5).

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