Gas pressure indicating device for gas insulated switchgear and gas insulated switchgear

Abstract

The utility model provides a kind of gas pressure indicating device and gas insulated switchgear for gas insulated switchgear, and the gas insulated switchgear includes a gas tank and a gas pressure indicating structure, the gas tank is filled with insulating gas, and the gas pressure indicating device includes: a connecting shaft, which extends along a first direction, the rotation of the connecting shaft can trigger the display of the gas pressure indicating structure to change;A magnetic induction part is fixed to the connecting shaft, and the change of gas pressure in the gas tank can trigger the rotation of the magnetic induction part and in turn drive the rotation of the connecting shaft;An angle sensor is located outside the gas tank, the connecting shaft is provided in the angle sensor, and the angle sensor and the connecting shaft are interference fit, and the connecting shaft can drive the rotation of the angle sensor.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, and in particular to a gas pressure indicating device for gas-insulated switchgear and a gas-insulated switchgear. Background Technology

[0002] Gas-insulated switchgear (GIS) includes a cable compartment, a gas chamber, an operating mechanism compartment, and a low-voltage compartment. The gas chamber is filled with insulating gas, typically SF6 or an environmentally friendly gas.

[0003] After long-term use, gas-insulated switchgear may experience slight leakage of insulating gas due to equipment aging. Once the leakage of insulating gas reaches a certain level, it will cause a decrease in the insulation performance of the gas-insulated switchgear and create safety hazards.

[0004] Therefore, it is necessary to monitor the gas pressure in the gas box of the insulated gas switchgear. In existing technology, an insulated gas switchgear is equipped with a pressure indicator, which typically includes a pointer and a dial to display whether the current pressure has reached the warning threshold. However, with this design, personnel can only see the actual gas pressure on-site. Utility Model Content

[0005] In view of this, the present invention proposes a pressure indicating device for a gas-insulated switchgear, the gas-insulated switchgear including a gas tank and a pressure indicating structure, the gas tank being filled with insulating gas, and the pressure indicating device comprising:

[0006] A coupling extending along a first direction, the rotation of which can trigger a change in the display of the barometric pressure indicator structure;

[0007] A magnetic sensing unit is fixed to the connecting shaft. Changes in the gas pressure inside the gas box can trigger the magnetic sensing unit to rotate, thereby driving the connecting shaft to rotate.

[0008] An angle sensor is located outside the air box, and a coupling passes through the angle sensor and the angle sensor is interference-fitted with the coupling. The coupling can drive the angle sensor to rotate.

[0009] In this way, users can know the real-time gas pressure inside the gas box without being on-site. Furthermore, the interference fit between the angle sensor and the coupling ensures smooth rotation of the coupling, thereby improving the accuracy of the angle sensor data.

[0010] According to the air pressure indicating device described above, optionally, the angle sensor includes a fixed part, a rotating part, and a driving part. The rotating part is rotatably disposed in the fixed part, and the coupling shaft can drive the rotating part to rotate through the driving part. The driving part includes:

[0011] A housing, through which the coupling passes;

[0012] An elastic ring is located inside the housing and is fitted onto the connecting shaft. The elastic ring is interference-fitted with both the housing and the connecting shaft.

[0013] This implementation method has a relatively simple structure.

[0014] Optionally, the pressure indicating device as described above may further include at least one of the following structures:

[0015] The inner wall of the housing is provided with a groove, and at least a portion of the elastic ring is located in the groove;

[0016] The portion of the connecting shaft that contacts the elastic ring is provided with a knurled structure.

[0017] Using grooves to fix the elastic ring is relatively simple.

[0018] The knurled structure increases the friction between the two parts, resulting in a better interference fit between the angle sensor and the coupling.

[0019] Optionally, according to the pressure indication device described above, the outer wall of the housing has a plane parallel to the axis of the housing. The presence of this plane facilitates the use of tools by the operator to fix the housing and adjust the initial angle of the angle sensor.

[0020] Optionally, according to the air pressure indicating device described above, the angle sensor further includes a fixing part, through which the coupling passes, and a protrusion is provided at one end of the housing, the protrusion being inserted into the gap between the fixing part and the coupling. This assembly method is relatively simple and easy to assemble.

[0021] Optionally, the pressure indicating device described above may further include a limiting member, which can be fixed to a support structure of the gas-insulated switchgear. The fixing part is fixed to the limiting member, and the limiting member can prevent the rotating part from moving away from the fixing part. This limiting member can prevent the rotating part from completely detaching from the hole in the fixing part, thus ensuring the reliability of the angle sensor.

[0022] According to the air pressure indicating device described above, optionally, the limiting member includes a first arm and a U-shaped portion. One end of the first arm is fixed to the support structure, and the other end is fixed to a U-shaped portion. The angle sensor is located in the U-shaped portion. The fixing portion is fixed to one side wall of the U-shaped portion, and the other side wall of the U-shaped portion can prevent the rotating portion from moving away from the fixing portion. This limiting method occupies less space.

[0023] Optionally, according to the pressure indicator device described above, the end of the other sidewall has a notch, through which the coupling passes. This notch, compared to a round hole, facilitates assembly while ensuring the strength of the other sidewall itself.

[0024] Optionally, the pressure indicating device described above may also include the support structure having two second through holes, the coupling passing through the two second through holes and the coupling being clearance-fitted with the two second through holes.

[0025] Optionally, according to the gas pressure indicating device described above, the gas-insulated switchgear also includes a bellows located in the gas box. Changes in the gas pressure inside the gas box can cause the bellows to extend and retract. A magnetic element is provided on the bellows, which can move with the extension and retraction of the bellows and drive the magnetic induction unit to rotate.

[0026] This utility model also provides a gas-insulated switchgear, including the gas pressure indicating device as described in any of the above claims. Attached Figure Description

[0027] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0028] Figure 1 This is a schematic diagram of the structure of a pressure indicating device for a gas-insulated switchgear according to an embodiment of the present invention, taken from one angle.

[0029] Figure 2 This is a structural schematic diagram of a gas pressure indicating device for a gas-insulated switchgear according to an embodiment of the present invention, from another angle.

[0030] Figure 3 This is a structural schematic diagram of a gas pressure indicating device for a gas-insulated switchgear according to an embodiment of the present invention, taken from another angle.

[0031] Figure 4 for Figure 1 A partial structural diagram of the air pressure indicator device.

[0032] Figure 5 This is a cross-sectional schematic diagram of a partial structure of a gas pressure indicating device for a gas-insulated switchgear according to an embodiment of the present invention.

[0033] The accompanying figure is labeled as follows:

[0034] 1-Corrugated pipe

[0035] 11-Magnetic components

[0036] 12-Free Movement End Face

[0037] 13-Intake pipe

[0038] 2-Installation Box

[0039] 31-Continuous

[0040] 32-Magnetic induction unit

[0041] 321-Magnetic Induction Sheet

[0042] 4-Angle Sensor

[0043] 41-Fixing Part

[0044] 411-Gap

[0045] 412-Arc-shaped hole

[0046] 42-Rotating part

[0047] 43-Driven Department

[0048] 431-Casing

[0049] 4311-groove

[0050] 4312-Plane

[0051] 432-Elastic Coil

[0052] 433-Protrusion

[0053] 5-Gap

[0054] 6-Limiting components

[0055] 61-First Arm

[0056] 611-Fasteners

[0057] 62-U-shaped section

[0058] 621 - One sidewall

[0059] 622 - Another sidewall

[0060] 6221-Gap

[0061] 623-Connecting Part

[0062] 624-Depression

[0063] 7-Supporting Structure

[0064] 71-Second through hole

[0065] 8-Pressure Indicator Structure

[0066] 81-Dial

[0067] 82-Pointer Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0069] This utility model provides a pressure indicating device for gas-insulated switchgear. For example... Figure 1 As shown, the gas-insulated switchgear includes a gas chamber (not shown in the figure) and a gas pressure indicating structure 8. In practical applications, the gas chamber can be filled with insulating gas.

[0070] like Figures 1 to 5 As shown, the air pressure indicating device of this utility model includes a coupling 31, a magnetic sensing part 32, and an angle sensor 4.

[0071] The connecting shaft 31 extends along a first direction D1, and rotation of the connecting shaft 31 can trigger a change in the display of the pressure indicator structure. This connecting shaft 31 is located outside the gas chamber. As an example, the pressure indicator structure 8 includes a dial 81 and a pointer 82. The connecting shaft 31 is connected to the pressure indicator structure 8, specifically to the dial 81 within the pressure indicator structure 8. The pressure indicator structure 8 can display the corresponding gas pressure within the gas chamber through rotation of the connecting shaft 31. Figure 1 As shown, one end of the coupling 31 is used to connect to the air pressure indicator structure, and the other end of the coupling 31 can be fixed with a magnetic sensing part 32.

[0072] The magnetic induction unit 32 is fixed to the coupling shaft 31. Changes in the gas pressure inside the gas box can trigger the magnetic induction unit 32 to rotate, thereby driving the coupling shaft 31 to rotate, and simultaneously driving the dial 81 to rotate. The pointer 82 is fixed, so that the user can combine the dial 81 and the pointer 82 to judge the current gas pressure in the gas box, such as whether the pressure has reached the warning line during inflation, i.e., whether it has fallen into the warning area. Figure 1The diagram shows pointer 82 pointing to the warning area on dial 81. This pressure indication structure may also include other devices capable of displaying pressure, such as a display screen showing real-time pressure values. Rotation of the coupling 31 triggers corresponding components to display the pressure on the screen. Specific settings can be configured according to actual needs and will not be elaborated further here.

[0073] More specifically, changes in the gas inside the gas chamber can be presented in various ways. For example, changes in the gas inside the gas chamber can be presented by a pressure sensor that monitors the gas pressure inside the gas chamber, or by a hardware structure that can change with the gas pressure inside the gas chamber.

[0074] The magnetic sensing unit 32 is located outside the gas chamber. As an example, a magnetic element 11 can be provided on the hardware structure capable of displaying changes in gas pressure within the gas chamber; specifically, when movement occurs, the magnetic element 11 also moves. The magnetic sensing unit 32 senses the magnetic element 11, therefore, movement of the magnetic element 11 can also cause the magnetic sensing unit 32 to rotate. Optionally, as... Figure 1 and 2 As shown, the hardware structure can be a bellows 1 located in an air chamber. An installation box 2 is provided within the air chamber, and the bellows 1 is located inside the installation box 2. Gas can be introduced into the bellows 1 through its inlet pipe 13, and the end of the inlet pipe 13 furthest from the bellows 1 is sealed. Because the bellows 1 is located in the air chamber, changes in the gas pressure inside the chamber can cause the bellows 1 to extend or retract. A magnetic element 11 is provided on the bellows 1. For example, the magnetic element 11 can be fixed to the free-moving end face 12 of the bellows 1. Specifically, the free-moving end face 12 can be provided with a support member, and the magnetic element 11 can be mounted on this support member. The magnetic element 11 can move with the extension and retraction of the bellows 1, causing the magnetic induction unit 32 to rotate. More specifically, the expansion and contraction of the bellows 1 can also cause the magnetic component 11 to move in the third direction D3 and the opposite direction of the third direction D3. The linear movement of the magnetic component 11 can cause the corresponding magnetic induction unit 32 to rotate, and then the rotation of the magnetic induction unit 32 causes the dial 81 on the pressure indicating structure 8 to rotate to the corresponding position, so that the pointer 82 points to the corresponding position on the dial 81. By using the magnetic induction of the magnetic induction unit 32 to obtain information, it can reflect the changes in gas pressure inside the gas box even outside the gas box, which can ensure the airtightness of the gas box as much as possible. Here, the bellows 1 can also be part of the pressure indicating structure 8.

[0075] As an example, such as Figure 1 and Figure 2As shown, when the gas tank is filled with gas, the gas pressure inside the gas tank increases, and the bellows 1 moves along the third direction D3, which in turn drives the magnetic component 11 to move along the third direction D3. The magnetic induction unit 32 rotates clockwise as the magnetic component 11 moves. Since the magnetic induction unit 32 is fixed to the connecting shaft 31, the connecting shaft 31 also moves clockwise, which in turn drives the dial 81 to rotate, so that the pointer 82 can point to the position on the dial 81 that displays the corresponding gas pressure. When the gas tank leaks, the gas pressure inside the gas tank decreases, and the bellows 1 moves in the opposite direction of the third direction D3, which in turn drives the magnetic component 11 to move in the opposite direction of the third direction D3. The magnetic induction unit 32 rotates counterclockwise as the magnetic component 11 moves, and the connecting shaft 31 moves counterclockwise accordingly, which in turn drives the dial 81 to rotate, so that the pointer 82 can point to the position on the dial 81 that displays the corresponding gas pressure.

[0076] The angle sensor 4 is located outside the gas chamber, and the coupling shaft 31 passes through the angle sensor 4 with an interference fit. The coupling shaft 31 can drive the angle sensor 4 to rotate. In this way, the gas pressure information inside the gas chamber can be obtained through the real-time data of the angle sensor 4. The gas pressure information includes at least one of the following: the degree of change in gas pressure, the current gas pressure, and the gas density.

[0077] The angle sensor 4 primarily detects changes in the angle of an object or system and converts them into a usable signal. Since the magnetic sensing unit 32 can reflect the pressure of the gas inside the gas chamber, the angle sensor 4, which rotates with the magnetic sensing unit 32, can also reflect the pressure of the gas inside the gas chamber. Thus, the angle sensor 4 can transmit a usable signal to the outside to obtain the pressure information of the gas inside the gas chamber. As an example, the relationship between the actual data measured by the angle sensor 4 and the gas pressure can be pre-measured and stored. The current gas pressure can then be determined based on the actual data measured by the angle sensor 4 and the pre-stored relationship. Of course, other existing methods can also be used to determine the current gas pressure or reflect changes in gas pressure using real-time data from the angle sensor 4; these will not be elaborated further.

[0078] The angle sensor 4 can have its own wireless signal transmission capability, or it can acquire data from the angle sensor 4 via a wireless communication device (not shown in the figure) and then transmit the acquired data. This wireless communication device can be installed in a low-pressure room, or utilize a module within the low-pressure room that already has wireless communication capabilities. Using a wireless communication device to transmit data simplifies the structure of the angle sensor 4 itself. The wireless communication device can also transmit data to a relatively long distance. The wireless communication device and the angle sensor 4 can be connected via a line. Of course, if the angle sensor 4 can achieve wireless transmission at a relatively short distance, it can first send the data to the wireless communication device, and then transmit it to a more distant location via wireless communication.

[0079] The interference fit between the angle sensor 4 and the coupling 31 means that when the coupling 31 is pressed into the hole of the angle sensor 4, the inner wall of the contact part will be stretched and slightly expanded. This elastic deformation generates a huge radial pressure between the coupling 31 and the angle sensor 4. This radial pressure generates a strong frictional force on the contact surface, thereby tightly fixing the coupling 31 and the angle sensor 4 together to form a solid whole. In this way, the angle sensor 4 and the coupling 31 rotate at the same angle. Using screws to fix the angle sensor 4 and the coupling 31 is problematic because the diameter of the coupling 31 may be very small, for example, less than 1 cm. The screws would directly press against the coupling 31, causing the coupling 31 to shift position, which is not conducive to fitting with the structure supporting the coupling 31, and can also cause jamming during the rotation of the coupling 31. Compared to the screw fixing method, this invention uses an interference fit, which facilitates obtaining more accurate monitoring results.

[0080] In this invention, the air pressure indicating device includes a coupling 31, a magnetic induction unit 32, and an angle sensor 4. Changes in the gas pressure inside the air chamber trigger the magnetic induction unit 32 to rotate. The rotation of the magnetic induction unit 32 drives the angle sensor 4 to rotate, thereby transmitting real-time data as a signal for remote monitoring of the gas pressure inside the air chamber. This allows users to obtain real-time information about the gas pressure inside the air chamber without being physically present. Furthermore, the angle sensor 4 and the coupling 31 are interference-fitted, ensuring smooth rotation of the coupling 31 and improving the accuracy of the data from the angle sensor 4.

[0081] As an example, the angle sensor 4 includes a fixed part 41, a rotating part 42, and a driving part 43. Because... Figure 1 The driving part 43 is not shown in the figure, therefore Figure 1The diagram only shows the angle sensor 4, which includes a fixed part 41 and a rotating part 42. The rotating part 42 is rotatably disposed within the fixed part 41, and the connecting shaft 31 can drive the rotating part 42 to rotate via a driving part 43. The driving part 43 includes a housing 431 and an elastic ring 432. The connecting shaft 31 passes through the housing 431. The elastic ring 432 is located inside the housing 431 and is fitted onto the connecting shaft 31, with an interference fit between the elastic ring 432 and both the housing 431 and the connecting shaft 31. The elastic ring 432 is clamped onto the connecting shaft 31, and the interference fit between the elastic ring 432 and the housing 431 allows both to rotate coaxially. During assembly, simply passing the connecting shaft 31 through the hole achieves the interference fit between the connecting shaft 31 and the angle sensor 4, which is very convenient. For example, the inner wall of the housing 431 has a groove 4311, and at least a portion of the elastic ring 432 is located in the groove 4311. This method of fixing the elastic ring 432 is relatively simple. The elastic ring 432 is not completely embedded in the groove 4311, and the part near the center has enough space to achieve an interference fit with the coupling 31.

[0082] As an example, the portion of the coupling 31 that contacts the elastic ring 432 has a knurled structure (not shown in the figure). This increases the friction at the contact point, resulting in a better interference fit between the angle sensor 4 and the coupling 31.

[0083] As another example, the radial cross section of the elastic ring 432 can be circular.

[0084] As another example, the outer wall of the housing 431 has a plane 4312, which is parallel to the axis of the housing 431. That is, due to the presence of the plane 4312, the housing 431 is a D-shaped cylinder. The presence of the plane 4312 makes it convenient for workers to use tools to fix the housing 431 in order to adjust the initial angle of the angle sensor 4.

[0085] As an example, the coupling 31 passes through the fixed part 41, and one end of the housing 431 is provided with a protrusion 433, which is inserted into the gap between the fixed part 41 and the coupling 31. It is conceivable that the fixed part 41 also has a hole allowing the coupling 31 to pass through, and the rotating part 42 can be disposed in this hole and rotate within it. More specifically, the protrusion 433 can be arranged around one end of the housing 431, essentially forming a cylindrical housing 431, which facilitates insertion into the gap 5 between the rotating part 42 and the coupling 31, that is, into the hole of the rotating part 42. The protrusion 433 can drive the rotating part 42 to rotate. Specifically, the rotating part 42 can be a cylinder with a D-shaped radial cross-section, and the radial cross-section of the protrusion 433 is also D-shaped. The outer sidewall of the protrusion 433 matches the inner sidewall of the rotating part 42, thereby causing the protrusion 433 to drive the rotating part 42 to rotate. This assembly method is relatively simple and easy to assemble.

[0086] To prevent large relative displacement between the angle sensor 4 and the coupling 31, a limiting member 6 can be provided. This limiting member 6 can be fixed to a support structure 7 of the gas-insulated switchgear. The fixing part 41 is fixed to the limiting member 6, and the limiting member 6 can prevent the rotating part 42 from moving away from the fixing part 41. Specifically, a bolt can be used to pass through the arc-shaped hole 412 on the fixing part 41 and the hole on the limiting member 6 to fix the limiting member 6 and the fixing part 41, so that the position of the limiting member 6 is fixed, the position of the fixing part 41 is also fixed, and thus the position of the rotating part 42 is fixed. The arc-shaped hole 412 facilitates the adjustment of the angle sensor 4, and then it is installed by bolt. Of course, a mounting hole 413 can also be used to connect the fixing part and the limiting member 6. Specifically, the fixing part can pass through the mounting hole 413 and the hole on the limiting member 6, which will not be elaborated here. This limiting member 6 can also be regarded as part of the support structure 7. Figures 1 to 5 As can be seen, the limiting member 6 can prevent the rotating part 42 from falling out of the hole of the fixing part 41, so as to ensure the reliability of the angle sensor 4.

[0087] As an example, the limiting member 6 includes a first arm 61 and a U-shaped portion 62. One end of the first arm 61 is fixed to the support structure 7, and the other end is fixed to a U-shaped portion 62. The angle sensor 4 is located in the U-shaped portion 62. The fixing part 41 is fixed to one side wall 621 of the U-shaped portion 62, and the other side wall 622 of the U-shaped portion 62 can prevent the rotating part 42 from moving away from the fixing part 41. For example, the first arm 61 and the U-shaped portion 62 are integrally formed. More specifically, one side wall 621 and the other side wall 622 of the U-shaped portion 62 are arranged opposite to each other and fixed to both sides of the connecting part 623. The angle sensor 4 is located in the space enclosed by the U-shaped portion 62. Since the position of the limiting member 6 is fixed, the position of the U-shaped portion 62 is also fixed, thereby fixing the position of the angle sensor 4. This limiting method occupies less space. A first through hole can be provided on the first arm 61, and a fastener 611 is inserted through the first through hole and the corresponding hole on the support structure 7, so that the first arm 61 is fixed to the support structure 7.

[0088] As another example, the end of the aforementioned other sidewall 622 has a notch 6221, through which the connecting shaft 31 passes. The notch 6221 is more convenient for assembly than a round hole, while ensuring the strength of the other sidewall 622 itself.

[0089] Furthermore, both the fixed part 41 and the rotating part 42 may include other structures inside to achieve data acquisition and / or transmission. These structures may be equipped with communication lines. As an example, the U-shaped part 62 may have a recess 624 to avoid these communication lines. Of course, other structures may also be provided to avoid these communication lines.

[0090] As another example, the support structure 7 has two second through holes 71, and a connecting shaft 31 passes through the two second through holes 71 with a clearance fit. The connecting shaft 31 is rotatably connected to the support structure 7. Figure 1 As shown, the support structure 7 can be a rigid plastic component, and the support structure 7 can be fixed inside the switch cabinet.

[0091] Optionally, the fixing part 41 of the angle sensor 4 has a notch 411, which can be engaged at a protrusion (not shown in the figure) of the support structure 7, thus limiting the angle sensor 4 in the second direction D2, that is, the rotating part can rotate at the same axis. Figures 1 to 4 The image shows one location of the notch 411. In actual use, the notch 411 can be set in other locations as needed, for example... Figures 1 to 4The symmetrical part of the notch 411, the number of which can be set according to actual needs, will not be elaborated here. In addition, even if there are multiple notches 411, one or more of them can be used to be locked onto the protrusion of the support structure 7.

[0092] The following specific examples illustrate the air pressure indicator device of this utility model, taking the monitoring of air pressure during customer use as an example.

[0093] like Figure 1 and Figure 2 As shown, the gas-insulated switchgear includes a gas chamber (not shown) and a gas pressure indicating structure 8. The gas chamber is filled with insulating gas and has a bellows 1. The bellows 1 can move linearly in the third direction D3 as the gas pressure changes. Figure 1 and Figure 2 The third direction D3 shown indicates the direction of movement of the bellows 1 when the gas pressure increases. The free-moving end face 12 of the bellows 1 is equipped with a magnetic element 11, which moves linearly along the bellows 1 in the third direction D3 and in the opposite direction. This structure can reflect the gas pressure inside the gas chamber in real time and is simple in design.

[0094] The air pressure indicating structure 8 includes a dial 81 and a pointer 82. The dial 81 is divided into two areas: a working area and a non-working area. The working area is marked in green, and the non-working area is marked in red. A dividing line separates the two areas. The non-working area indicates that the gas pressure inside the gas tank is below the required level; in this case, the switchgear cannot be operated. Specifically, when the pointer 82 reaches the dividing line between the two areas, the switchgear will cease operation. Alternatively, an alarm zone, for example, marked in yellow, can be added between the working and non-working areas. When the pointer 82 reaches the boundary between the alarm zone and the non-working zone, the pointer 82 will cease operation. The dial 81 can rotate, allowing the pointer 82 to rotate and point to different areas on the dial 81.

[0095] The connecting shaft 31 is supported by the support structure 7 and rotatably connected to the support structure 7. The support structure 7 has two second through holes 71 for the connecting shaft 31 to pass through, and the connecting shaft 31 can rotate within these two second through holes 71. One end of the connecting shaft 31 is fixed to the dial 81, and the other end is fixed to the magnetic sensing unit 32. The angle sensor 4 is fixed to the connecting shaft 31 by an interference fit. Due to the magnetic effect between the magnetic sensing unit 32 and the magnetic element 11, when the magnetic element 11 moves in the third direction D3 and in the opposite direction of the third direction D3, the magnetic sensing unit 32 can rotate accordingly, thereby driving the connecting shaft 31 to rotate. As a specific example, the magnetic sensing unit 32 can be provided with a magnetic induction sheet 321 to interact magnetically with the magnetic element 11. As an example, suppose gas leaks inside the gas tank, causing a drop in pressure. The bellows 1 extends, and the magnetic component 11 moves in the opposite direction to the third direction D3, which in turn causes the magnetic sensing unit 32 to move counterclockwise, which in turn causes the dial 81 to move counterclockwise, gradually approaching the alarm area.

[0096] Since the rotating part 42 of the angle sensor 4 is fixed to the connecting shaft via the driving part 43, the rotating part 42 of the angle sensor 4 will rotate with the connecting shaft 31, thereby generating a corresponding signal, which is transmitted to the wireless communication device located in the low-pressure chamber via a hardware line. The wireless communication device processes the collected signal and then remotely sends it to a client, such as a mobile phone or computer. The client processes the signal according to a pre-defined algorithm and reconstructs the pressure change inside the air chamber based on the signal related to the rotation angle emitted by the angle sensor 4, such as displaying the current air pressure value or the current air pressure reduction. In this way, the user can remotely know the air pressure inside the air chamber through the client, which is convenient for the user.

[0097] Since the support structure 7 has two second through holes 71, there are two points of contact between the connecting shaft 31 and the support structure 7. The connecting shaft 31 is fixed to the elastic ring 432 by an interference fit. The elastic ring 432 can provide a certain space so that the connecting shaft 31 can tilt at a certain angle. This way, the connecting shaft 31 will not jam when rotating, thus making the information obtained by the angle sensor 4 more accurate.

[0098] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure indicating device for a gas-insulated switchgear, the gas-insulated switchgear comprising a gas chamber and a pressure indicating structure (8), the gas chamber being filled with insulating gas, characterized in that, The air pressure indicating device includes: A coupling (31) extends along a first direction (D1), and rotation of the coupling (31) can trigger a change in the display of the pressure indicator structure (8); A magnetic sensing unit (32) is fixed to the connecting shaft (31). Changes in the gas pressure inside the gas box can trigger the magnetic sensing unit (32) to rotate, thereby driving the connecting shaft (31) to rotate. An angle sensor (4) is located outside the air box. The connecting shaft (31) passes through the angle sensor (4) and the angle sensor (4) is interference-fitted with the connecting shaft (31). The connecting shaft (31) can drive the angle sensor (4) to rotate.

2. The air pressure indicating device according to claim 1, characterized in that, The angle sensor (4) includes a fixed part (41), a rotating part (42), and a driving part (43). The rotating part (42) is rotatably disposed in the fixed part (41). The connecting shaft (31) can drive the rotating part (42) to rotate through the driving part (43). The driving part (43) includes: A housing (431), through which the connecting shaft (31) passes. An elastic ring (432) is located inside the housing (431) and is sleeved on the connecting shaft (31). The elastic ring (432) is interference-fitted with both the housing (431) and the connecting shaft (31).

3. The air pressure indicating device according to claim 2, characterized in that, It also includes at least one of the following structures: The inner wall of the housing (431) is provided with a groove (4311), and at least a portion of the elastic ring (432) is located in the groove (4311); The portion of the connecting shaft (31) that contacts the elastic ring (432) is provided with a knurled structure.

4. The air pressure indicating device according to claim 2, characterized in that, The outer side wall of the housing (431) has a plane (4312) that is parallel to the axis of the housing (431).

5. The air pressure indicating device according to claim 2, characterized in that, The connecting shaft (31) passes through the fixing part (41), and a protrusion (433) is provided at one end of the housing (431). The protrusion (433) is inserted into the gap (5) between the fixing part (41) and the connecting shaft (31).

6. The air pressure indicating device according to claim 5, characterized in that, Also includes: A limiting member (6) is fixed to a support structure (7) of the gas-insulated switchgear, and the fixing part (41) is fixed to the limiting member (6). The limiting member (6) can prevent the rotating part (42) from moving away from the fixing part (41).

7. The air pressure indicating device according to claim 6, characterized in that, The limiting member (6) includes a first arm (61) and a U-shaped part (62). One end of the first arm (61) is fixed to the support structure, and the other end is used to fix to a U-shaped part (62). The angle sensor (4) is located in the U-shaped part (62). The fixing part (41) is fixed to one side wall (621) of the U-shaped part (62). The other side wall (622) of the U-shaped part (62) can prevent the rotating part (42) from moving away from the fixing part (41).

8. The air pressure indicating device according to claim 7, characterized in that, The other sidewall (622) has a notch (6221) at its end, through which the connecting shaft (31) passes.

9. The air pressure indicating device according to claim 6, characterized in that, Also includes: The support structure (7) has two second through holes (71), and the connecting shaft (31) passes through the two second through holes (71) with clearance fitting between the connecting shaft (31) and the two second through holes (71).

10. The air pressure indicating device according to any one of claims 1-9, characterized in that, The gas-insulated switchgear also includes a bellows (1) located in the gas box. Changes in the gas pressure inside the gas box can cause the bellows (1) to extend and retract. A magnetic element (11) is provided on the bellows (1). The magnetic element (11) can move with the extension and retraction of the bellows (1) and drive the magnetic induction part (32) to rotate.

11. A gas-insulated switchgear, comprising the gas pressure indicating device according to any one of claims 1-10.

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