A pressure relief valve for a high-voltage switch and a high-voltage switch.

Abstract

This invention provides a pressure relief valve and a high-voltage switch for high-voltage switches, belonging to the field of high-voltage switch technology. The pressure relief valve for high-voltage switches includes a valve seat, a valve plate, and a spring. The valve seat has a sleeve for an insulating pull rod to pass through. The valve plate and spring are fitted onto the sleeve. One end of the spring near the valve seat presses the valve plate against the valve seat. The sleeve has a limiting element, and the other end of the spring engages with the limiting element in an axial stop engagement with the sleeve. The pressure relief valve for high-voltage switches provided by this invention can effectively solve the technical problem of low production efficiency caused by the large number of components in existing pressure relief valves.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pressure relief valve for high voltage switch and high voltage switch, belong to high voltage switch technical field. BACKGROUND

[0002] Self-energizing arc extinguishing chamber increases the pressure in the chamber by utilizing arc energy, has the advantages of high reliability, low operating power, etc., and has been widely used by high voltage switch manufacturers, and gradually develops to higher voltage grade. As a core component of self-energizing arc extinguishing chamber, the pressure relief valve has a significant impact on the mechanical characteristics of high voltage switch, the pressure build-up of arc extinguishing chamber and breaking capacity, so the structure design of the pressure relief valve has attracted more and more attention from high voltage switch researchers.

[0003] During the breaking of large current, the pressure chamber does not contribute to gas blowing, and the compression of the gas in the pressure chamber hinders the movement of the arc extinguishing chamber. As the volume of the pressure chamber becomes smaller and smaller, the movement of the arc extinguishing chamber is hindered more and more. Therefore, in order to eliminate this hindering effect, the self-energizing arc extinguishing chamber is provided with a pressure relief structure of the pressure chamber to relieve the pressure of the pressure chamber when breaking large current, limit the rise of the pressure of the pressure chamber, reduce the opening resistance and the operating power. During closing, the volume of the pressure chamber gradually increases, the pressure gradually decreases, and the pressure relief valve can be used to supplement air to reduce the closing resistance. The existing pressure relief valve usually includes a valve seat, a valve plate, a spring and a spring support. The spring is compressed during installation to ensure that the valve plate can be opened to relieve pressure when the gas pressure in the pressure chamber is too high. For example, a new tank type high voltage switch pressure relief valve valve plate stabilizing device is provided in the Chinese utility model patent with the authorization announcement date of January 23, 2013 and the authorization announcement number of CN202695268U. The stabilizing device includes a valve seat, a valve plate, a spring and a spring support. To ensure that the valve plate is balanced, the spring is arranged in multiple intervals around the valve seat.

[0004] Although the above-mentioned pressure relief valve valve plate stabilizing device can meet the use requirements, there are some problems in the use process. Specifically, because the number of springs and spring supports of the stabilizing device is large, the production and assembly are complicated, which seriously affects the production efficiency. SUMMARY

[0005] The purpose of the present application is to provide a pressure relief valve for high voltage switch to solve the technical problem of low production efficiency caused by too many parts of the pressure relief valve in the prior art. Meanwhile, the present application also provides a high voltage switch to solve the above-mentioned problems.

[0006] The pressure relief valve for high voltage switch in the present application adopts the following technical scheme:

[0007] The pressure relief valve for the high-voltage switch includes a valve seat, a valve plate, and a spring. The valve seat is provided with a sleeve for the insulating pull rod to pass through. The valve plate and spring are fitted onto the sleeve. One end of the spring near the valve seat presses the valve plate against the valve seat. The sleeve is provided with a limiting element. The other end of the spring and the limiting element are engaged in an axial stop engagement with the sleeve.

[0008] Beneficial Effects: The improved pressure relief valve for high-voltage switches provided by this invention allows for the following benefits: During high-current interruption, the energy generated by the electric arc causes the gas pressure in the expansion chamber to exceed that in the compression chamber. As the moving contact moves to the right, the gas pressure in the compression chamber increases. When the pressure in the compression chamber is sufficiently high, the valve plate opens under the pressure, thus releasing the overpressure in the compression chamber. This limits the pressure rise in the compression chamber and reduces the operating effort of the mechanism. Compared to pressure relief valves in the prior art, the pressure relief valve provided by this invention uses a sleeve on the valve seat to house the spring and valve plate, reducing the number of springs required. Furthermore, since the sleeve is located at the center of the valve seat, housing the spring and valve plate ensures balanced force on the valve plate.

[0009] Furthermore, a position adjustment structure is provided between the limiting member and the sleeve to adjust the position of the limiting member on the sleeve in the axial direction of the sleeve.

[0010] Beneficial effects: By adjusting the position of the limiting component on the sleeve through the position adjustment mechanism, the preload of the spring can be changed, thereby controlling the opening pressure of the pressure relief valve and increasing the application range of the pressure relief valve.

[0011] Furthermore, the position adjustment structure is a threaded connection structure.

[0012] Beneficial effects: The threaded connection structure facilitates operation and processing.

[0013] Furthermore, the limiting member includes a connecting portion extending radially along the sleeve and a protective portion extending axially along the sleeve. The protective portion is located on the outer periphery of the spring during use, and a connecting structure for connection and fixation is provided between the connecting portion and the sleeve.

[0014] Beneficial effects: When in use, the connecting part of the limiting member is connected and fixed to the sleeve through the connecting structure. The protective part extends along the axial direction of the sleeve and is located on the outer periphery of the spring, which can protect the spring.

[0015] Furthermore, the connecting structure includes a locking block and a locking slot, one of which is located on the connecting part and the other is located on the sleeve.

[0016] Beneficial effects: The card blocks and slots are easy to process and convenient to install.

[0017] Furthermore, the pressure relief valve also includes an air inlet plate located between the valve plate and the valve hole on the valve seat. The air inlet plate has a movable space in the axial direction of the sleeve to form an air inlet gap with the valve plate in the radial direction of the sleeve. The air inlet plate is provided with an air inlet hole for communicating with the valve hole on the valve seat.

[0018] Beneficial effects: When air intake is required, the gas enters the intake port through the intake gap between the intake plate and the valve plate, and then enters the valve port through the intake port, and finally enters the compression chamber, thereby reducing the resistance to closing the circuit.

[0019] Furthermore, the valve seat is provided with an annular step, the radial dimension of which is greater than that of the sleeve and is arranged coaxially with the sleeve. The air intake plate is fitted on the annular step and has the aforementioned movement space on the annular step.

[0020] Beneficial effects: The radial dimension of the annular step is larger than that of the sleeve and is arranged coaxially with the sleeve, which allows the end face of the annular step to limit the valve plate; in addition, when the pressure relief valve is opened, the valve plate can also be opened by the air inlet plate pushing it open, thereby improving the performance of the pressure relief valve.

[0021] Furthermore, the radial dimension of the intake plate is larger than that of the valve plate.

[0022] Beneficial effect: The radial dimension of the intake plate is larger than that of the valve plate, which makes it easier for gas to enter the intake gap.

[0023] Furthermore, the valve seat is provided with a guide sleeve for guiding the insulating tie rod.

[0024] Beneficial effect: The guide sleeve can make the insulated pull rod move more smoothly.

[0025] The high-voltage switch in this invention adopts the following technical solution:

[0026] The high-voltage switch includes an arc-extinguishing chamber, on which a pressure relief valve is installed. The pressure relief valve includes a valve seat, a valve plate, and a spring. The valve seat is provided with a sleeve for an insulating pull rod to pass through. The valve plate and spring are fitted onto the sleeve. One end of the spring near the valve seat presses the valve plate against the valve seat. The sleeve is provided with a limiting element, and the other end of the spring is engaged with the limiting element in an axial stop engagement with the sleeve.

[0027] Beneficial Effects: The improved pressure relief valve for high-voltage switches provided by this invention allows for the following benefits: During high-current interruption, the energy generated by the electric arc causes the gas pressure in the expansion chamber to exceed that in the compression chamber. As the moving contact moves to the right, the gas pressure in the compression chamber increases. When the pressure in the compression chamber is sufficiently high, the valve plate opens under the pressure, thus releasing the overpressure in the compression chamber. This limits the pressure rise in the compression chamber and reduces the operating effort of the mechanism. Compared to pressure relief valves in the prior art, the pressure relief valve provided by this invention uses a sleeve on the valve seat to house the spring and valve plate, reducing the number of springs required. Furthermore, since the sleeve is located at the center of the valve seat, housing the spring and valve plate ensures balanced force on the valve plate.

[0028] Furthermore, a position adjustment structure is provided between the limiting member and the sleeve to adjust the position of the limiting member on the sleeve in the axial direction of the sleeve.

[0029] Beneficial effects: By adjusting the position of the limiting component on the sleeve through the position adjustment mechanism, the preload of the spring can be changed, thereby controlling the opening pressure of the pressure relief valve and increasing the application range of the pressure relief valve.

[0030] Furthermore, the position adjustment structure is a threaded connection structure.

[0031] Beneficial effects: The threaded connection structure facilitates operation and processing.

[0032] Furthermore, the limiting member includes a connecting portion extending radially along the sleeve and a protective portion extending axially along the sleeve. The protective portion is located on the outer periphery of the spring during use, and a connecting structure for connection and fixation is provided between the connecting portion and the sleeve.

[0033] Beneficial effects: When in use, the connecting part of the limiting member is connected and fixed to the sleeve through the connecting structure. The protective part extends along the axial direction of the sleeve and is located on the outer periphery of the spring, which can protect the spring.

[0034] Furthermore, the connecting structure includes a locking block and a locking slot, one of which is located on the connecting part and the other is located on the sleeve.

[0035] Beneficial effects: The card blocks and slots are easy to process and convenient to install.

[0036] Furthermore, the pressure relief valve also includes an air inlet plate located between the valve plate and the valve hole on the valve seat. The air inlet plate has a movable space in the axial direction of the sleeve to form an air inlet gap with the valve plate in the radial direction of the sleeve. The air inlet plate is provided with an air inlet hole for communicating with the valve hole on the valve seat.

[0037] Beneficial effects: When air intake is required, the gas enters the intake port through the intake gap between the intake plate and the valve plate, and then enters the valve port through the intake port, and finally enters the compression chamber, thereby reducing the resistance to closing the circuit.

[0038] Furthermore, the valve seat is provided with an annular step, the radial dimension of which is greater than that of the sleeve and is arranged coaxially with the sleeve. The air intake plate is fitted on the annular step and has the aforementioned movement space on the annular step.

[0039] Beneficial effects: The radial dimension of the annular step is larger than that of the sleeve and is arranged coaxially with the sleeve, which allows the end face of the annular step to limit the valve plate; in addition, when the pressure relief valve is opened, the valve plate can also be opened by the air inlet plate pushing it open, thereby improving the performance of the pressure relief valve.

[0040] Furthermore, the radial dimension of the intake plate is larger than that of the valve plate.

[0041] Beneficial effect: The radial dimension of the intake plate is larger than that of the valve plate, which makes it easier for gas to enter the intake gap.

[0042] Furthermore, the valve seat is provided with a guide sleeve for guiding the insulating tie rod.

[0043] Beneficial effect: The guide sleeve can make the insulated pull rod move more smoothly. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of embodiment 1 of the high-voltage switch of the present invention;

[0045] Figure 2 yes Figure 1 Cross-sectional view of the pressure relief valve;

[0046] Figure 3 This is a schematic diagram of the structure of embodiment 8 of the pressure relief valve of the present invention.

[0047] The names of the components corresponding to the corresponding reference numerals in the figure are:

[0048] Figures 1 to 2 In the middle section: 100. Moving contact assembly; 101. Expansion chamber; 102. Support; 103. Compressed air chamber; 104. Pressure relief valve; 105. Insulating tie rod; 106. Moving contact; 107. Valve seat; 108. Valve plate; 109. Spring; 110. Air inlet plate; 111. Sleeve; 112. Limiting component; 113. Air inlet hole; 114. Annular step; 115. Valve hole; 116. Guide sleeve; 117. Connecting part; 118. Protective part;

[0049] Figure 3 In the middle: 200, limiting component; 201, sleeve. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to embodiments.

[0051] Embodiment 1 of the high-voltage switch in this invention:

[0052] like Figure 1 As shown, the high-voltage switch provided in this embodiment includes a moving contact assembly 100, an expansion chamber 101, a support 102, a compressed air chamber 103, and a pressure relief valve 104. The moving contact assembly 100 includes a moving contact 106 and an insulating pull rod 105. The insulating pull rod 105 is connected to the moving contact 106 and passes through the pressure relief valve 104.

[0053] In this embodiment, as Figure 2 As shown, the pressure relief valve 104 includes a valve seat 107, a valve plate 108, and a spring 109. The valve seat 107 is provided with a sleeve 111 for the insulating pull rod 105 to pass through. The valve plate 108 and the spring 109 are both fitted on the sleeve 111. One end of the spring 109 near the valve seat 107 presses the valve plate 108 against the valve seat 107. The sleeve 111 is provided with a limiting member 112. The other end of the spring 109 and the limiting member 112 are engaged in a stop engagement in the axial direction of the sleeve 111.

[0054] In this embodiment, as Figure 2 As shown, the pressure relief valve 104 also includes an air inlet plate 110 located between the valve plate 108 and the valve hole 115 on the valve seat 107. The valve seat 107 has an annular step 114, the radial dimension of which is larger than that of the sleeve 111 and is coaxially arranged with the sleeve 111. The air inlet plate 110 is fitted onto the annular step 114 and has a movable space on the annular step 114. This movable space allows for the formation of an air inlet gap with the valve plate 108 in the radial direction of the sleeve 111. The air inlet plate 110 has an air inlet hole 113 for communicating with the valve hole 115 on the valve seat 107.

[0055] In this embodiment, as Figure 2 As shown, the limiting member 112 includes a connecting portion 117 extending radially along the sleeve 111 and a protective portion 118 extending axially along the sleeve 111. During use, the protective portion 118 is located on the outer periphery of the spring 109 to protect the spring 109. A connecting structure for connection and fixation is provided between the connecting portion 117 and the sleeve 111. The connecting structure includes a locking block and a locking groove. The locking block is provided on the connecting portion 117, and the locking groove is provided on the sleeve 111.

[0056] In this embodiment, to facilitate the entry of gas into the intake gap, the radial dimension of the intake plate 110 is larger than that of the valve plate 108. Additionally, the valve seat 107 is provided with a guide sleeve 116 for guiding the insulating pull rod 105.

[0057] In this embodiment, during the high current interruption phase, the energy generated by the arc combustion causes the gas pressure in the expansion chamber 101 to be greater than the gas pressure in the compression chamber 103. As the moving contact 106 moves to the right, the gas pressure in the compression chamber 103 increases. When the inlet plate 110 is subjected to the gas pressure from the compression chamber 103, the inlet plate 110 moves to the left until it comes into contact with the valve plate 108. When the pressure in the compression chamber 103 is high enough, the valve plate 108 moves to the left together with the inlet plate 110. At this time, the pressure relief valve 104 opens, thereby releasing the overpressure in the compression chamber 103. This limits the rise in pressure in the compression chamber 103 and also reduces some of the operating work of the mechanism.

[0058] During the low-current interruption phase, the pressure relief valve 104 closes, sealing the gas in the compression chamber 103 to increase the gas pressure and allow the gas to enter the expansion chamber 101 to achieve low-current interruption. During the closing phase, the moving contact 106 moves to the left, gradually increasing the volume of the compression chamber 103 and gradually decreasing the pressure. The gas enters the inlet hole 113 through the inlet gap between the inlet plate 110 and the valve plate 108, then enters the valve hole 115 through the inlet hole 113, and finally enters the compression chamber 103, thereby reducing the resistance to closing.

[0059] Embodiment 2 of the high-voltage switch in this invention:

[0060] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the valve seat is provided with a guide sleeve. In this embodiment, the valve seat is not provided with a guide sleeve.

[0061] Embodiment 3 of the high-voltage switch in this invention:

[0062] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the limiting member includes a connecting part and a protective part. In this embodiment, the limiting member is a limiting block, and the limiting block is provided with a connecting structure for connecting and fixing with the sleeve.

[0063] Embodiment 4 of the high-voltage switch in this invention:

[0064] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the radial dimension of the intake plate is larger than the radial dimension of the valve plate. In this embodiment, the radial dimension of the intake plate is smaller than the radial dimension of the valve plate. Alternatively, the radial dimension of the intake plate is equal to the radial dimension of the valve plate.

[0065] Embodiment 5 of the high-voltage switch in this invention:

[0066] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the valve seat has an annular step, the radial dimension of which is larger than that of the sleeve and is coaxially arranged with the sleeve. The intake plate is fitted onto the annular step and has the aforementioned movable space on the annular step. In this embodiment, the valve seat does not have an annular step, but instead has a guide post, on which the intake plate is guided and movably mounted.

[0067] Embodiment 6 of the high-voltage switch in this invention:

[0068] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the connecting structure includes a locking block and a locking groove. In this embodiment, the connecting structure includes a fixing bolt, the limiting member has a through hole for the fixing bolt to pass through, and the sleeve has a fixing hole for threaded fixing with the fixing bolt.

[0069] Embodiment 7 of the high-voltage switch in this invention:

[0070] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the locking block is located on the connecting part, and the locking groove is located on the sleeve. In this embodiment, the locking groove is located on the connecting part, and the locking groove block is located on the sleeve.

[0071] Embodiment 8 of the high-voltage switch in this invention:

[0072] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, there is no position adjustment structure between the limiting member and the sleeve. However, in this embodiment, as... Figure 3 As shown, a position adjustment structure is provided between the limiting member 200 and the sleeve 201. The position adjustment structure is specifically a threaded connection structure, and the limiting member 200 is specifically a nut. The limiting member 200 can adjust its position in the axial direction of the sleeve 201 through the threaded connection structure, thereby changing the preload on the spring.

[0073] Embodiment 9 of the high-voltage switch in this invention:

[0074] The difference between this embodiment and embodiment 8 is that in embodiment 8, the position adjustment structure is a threaded connection structure. In this embodiment, the position adjustment structure includes a fixing pin and fixing pin holes. Multiple fixing pin holes are arranged at intervals along the axial direction of the sleeve, and the limiting member is provided with through holes for the fixing pins to pass through.

[0075] An embodiment of the pressure relief valve for high-voltage switches in this invention:

[0076] The structure of the pressure relief valve for the high-voltage switch provided in this embodiment is the same as that of the pressure relief valve in any of the above embodiments of the high-voltage switch, and will not be described again here.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A relief valve for high voltage switches comprising a valve seat, a valve disc and a spring, characterized in that The valve seat is provided with a sleeve for the insulation pull rod to pass through, the valve disc and the spring are sleeved on the sleeve, one end of the spring close to the valve seat abuts the valve disc on the valve seat, the sleeve is provided with a limiting piece, and the other end of the spring is in abutting engagement with the limiting piece in the axial direction of the sleeve; the pressure relief valve further comprises an air inlet disc between the valve disc and the valve hole on the valve seat, the air inlet disc has a movement space in the axial direction of the sleeve, so as to form an air inlet gap with the valve disc in the radial direction of the sleeve, and the air inlet disc is provided with an air inlet hole for communicating with the valve hole on the valve seat.

2. The pressure relief valve for high voltage switches according to claim 1, characterized in that The limiting piece and the sleeve are provided with a position adjusting structure for adjusting the position of the limiting piece on the sleeve in the axial direction of the sleeve.

3. The pressure relief valve for high voltage switches according to claim 2, characterized in that The position adjusting structure is a threaded connection structure.

4. The pressure relief valve for high voltage switches according to claim 1, characterized in that, The limiting piece comprises a connecting part extending in the radial direction of the sleeve and a protection part extending in the axial direction of the sleeve, the protection part is located at the outer periphery of the spring in use, and the connecting part and the sleeve are provided with a connecting structure for connection and fixation.

5. The pressure relief valve for high voltage switches according to claim 4, characterized in that The connecting structure comprises a clamping block and a clamping groove, one of the clamping block and the clamping groove is arranged on the connecting part, and the other is arranged on the sleeve.

6. The pressure relief valve for high voltage switches according to claim 1, characterized in that The valve seat is provided with an annular step, the radial dimension of the annular step is greater than that of the sleeve and is coaxially arranged with the sleeve, the air inlet disc is sleeved on the annular step and has the movement space on the annular step.

7. The pressure relief valve for high voltage switches according to claim 1, characterized in that The radial dimension of the air inlet disc is greater than that of the valve disc.

8. The pressure relief valve for high voltage switches according to any one of claims 1 to 5, characterized in that The valve seat is provided with a guide sleeve for guiding the insulation pull rod.

9. A high voltage switch comprising an arc quenching chamber on which a pressure relief valve is mounted, characterized in that, The pressure relief valve comprises a valve seat, a valve disc and a spring, characterized in that the valve seat is provided with a sleeve for the insulation pull rod to pass through, the valve disc and the spring are sleeved on the sleeve, one end of the spring close to the valve seat abuts the valve disc on the valve seat, the sleeve is provided with a limiting piece, and the other end of the spring is in abutting engagement with the limiting piece in the axial direction of the sleeve; the pressure relief valve further comprises an air inlet disc between the valve disc and the valve hole on the valve seat, the air inlet disc has a movement space in the axial direction of the sleeve, so as to form an air inlet gap with the valve disc in the radial direction of the sleeve, and the air inlet disc is provided with an air inlet hole for communicating with the valve hole on the valve seat.

10. The high voltage switch of claim 9, wherein, The limiting piece and the sleeve are provided with a position adjusting structure for adjusting the position of the limiting piece on the sleeve in the axial direction of the sleeve.

11. The high voltage switch of claim 10, wherein, The position adjusting structure is a threaded connection structure.

12. The high voltage switch of claim 9, wherein, The limiting piece comprises a connecting part extending in the radial direction of the sleeve and a protection part extending in the axial direction of the sleeve, the protection part is located at the outer periphery of the spring in use, and the connecting part and the sleeve are provided with a connecting structure for connection and fixation.

13. The high voltage switch of claim 12, wherein, The connecting structure comprises a clamping block and a clamping groove, one of the clamping block and the clamping groove is arranged on the connecting part, and the other is arranged on the sleeve.

14. The high voltage switch of claim 9, wherein, The valve seat is provided with an annular step, the radial dimension of the annular step is greater than that of the sleeve and is coaxially arranged with the sleeve, the air inlet disc is sleeved on the annular step and has the movement space on the annular step.

15. The high voltage switch of claim 9, wherein, The radial dimension of the air inlet disc is greater than that of the valve disc.

16. The high voltage switch according to any of claims 9-13, characterized by The valve seat is provided with a guide sleeve for guiding the insulation pull rod.

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