Heat dissipation structure for static end of vacuum arc-extinguishing chamber and vacuum circuit breaker

Abstract

The invention relates to the field of cooling of switch parts, in particular to a heat dissipation structure for a static end of a vacuum arc-extinguishing chamber and a vacuum circuit breaker. The heat dissipation structure for the static end of the vacuum arc-extinguishing chamber comprises a static end support arranged at the static end of the vacuum arc-extinguishing chamber, a containing cavity is formed in the static end support, a radiator is fixedly arranged in the containing cavity and comprises a heat dissipation part and an installation part, and a heat dissipation opening is further formed in the static end support. The heat dissipation openings are formed in the side wall of the static end support, so that heat on the radiator can be conveniently transferred to the outside of the static end support; as the radiator is integrally arranged in the accommodating cavity, point discharge does not occur between the radiator and the static end support, and the static end support also shields the radiator, so that point discharge does not easily occur to the radiator, and the service life of the radiator is prolonged. Therefore, the problem that the radiator is easy to generate point discharge due to the fact that the radiator protruding out of the static end support is arranged on the static end support for heat dissipation of the static end of the vacuum arc-extinguishing chamber in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of cooling of switching components, and more particularly to a heat dissipation structure for the stationary end of a vacuum interrupter and a vacuum circuit breaker. Background Technology

[0002] The vacuum interrupter is a key component within a vacuum circuit breaker. Specifically, the vacuum interrupter includes a shell and moving-end supports and stationary-end supports located at both ends of the shell. Inside the vacuum interrupter, there are also moving conductive rods connected to the moving-end supports and stationary conductive rods fixedly mounted on the stationary-end supports. In the closed state, the moving and stationary conductive rods form a circuit, through which a large current flows. Due to the thermal effect of the current, a significant amount of heat is generated on the moving and stationary conductive rods inside the vacuum interrupter. Most of this heat can only be transferred along the moving and stationary conductive rods to the stationary and moving-end supports for dissipation. Therefore, existing technologies also include additional heat sinks installed on the stationary-end supports.

[0003] For example, Chinese utility model patent CN208336035U, with an authorization announcement date of January 4, 2019, discloses a vacuum interrupter stationary end heat dissipation assembly and a high-voltage, high-current vacuum circuit breaker. In this assembly, an upper heat sink is provided on the upper terminal (i.e., stationary end support) of the stationary end. Specifically, the upper heat sink includes a heat dissipation pipe and heat dissipation fins located outside the heat dissipation pipe. Horizontal and vertical grooves are provided between adjacent heat dissipation fins, thereby increasing the contact area between the heat sink and the external gas and improving the heat dissipation efficiency.

[0004] However, in the above technical solution, the stationary end support also serves as a current transfer device. A stationary end conductor is connected to the stationary end support to form a complete circuit, naturally making the stationary end support energized as well. To ensure thermal conductivity, the heat sink is made of metal. Since it is fixedly connected to the stationary end support, the heat sink also becomes energized. Each heat sink fin has edges that can accumulate charge, making it prone to point discharge. This places higher demands on the insulation inside the circuit breaker. Summary of the Invention

[0005] The purpose of this invention is to provide a heat dissipation structure for the stationary end of a vacuum interrupter, which solves the problem in the prior art where heat dissipation of the stationary end of a vacuum interrupter is achieved by setting a heat sink protruding from the stationary end support, which makes the heat sink prone to tip discharge; the purpose of this invention is also to provide a vacuum circuit breaker to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the heat dissipation structure for the stationary end of the vacuum interrupter in this invention adopts the following technical solution: A heat dissipation structure for the stationary end of a vacuum interrupter includes a stationary end support for mounting at the stationary end of the vacuum interrupter. The stationary end support has a receiving cavity inside, and a radiator is fixedly mounted inside the receiving cavity. The radiator includes a heat dissipation part and a mounting part for fixed connection to the stationary end support. The stationary end support also has a heat dissipation port that connects to external gas and the receiving cavity.

[0007] Furthermore, the stationary end support is provided with fastener mounting holes for installing fasteners to be fixedly connected to the stationary conductive rod in the vacuum interrupter chamber, and the mounting part is provided with fastener clearance grooves for avoiding the fastener mounting holes.

[0008] Furthermore, the heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The center of the radiator is provided with a bolt hole for the fastening bolt to pass through. The bolt hole includes a large-diameter hole located in the heat dissipation part and a small-diameter hole located in the mounting part. A stepped structure is formed between the large-diameter hole and the small-diameter hole. A stepped surface is formed on the stepped structure for engaging with the bolt head stop of the fastening bolt. The fastener clearance grooves are arranged at intervals around the bolt hole.

[0009] Furthermore, the heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The radiator has a bolt hole at its center for the fastening bolt to pass through. The bolt hole has a stepped structure with a stepped surface that engages with the bolt head stop of the fastening bolt.

[0010] Furthermore, the heat dissipation section and the heat dissipation port have an overlapping portion in a direction perpendicular to the axis of the heat sink.

[0011] Furthermore, the end of the stationary support away from the stationary conductive rod is also provided with an insulating support. The insulating support has a communicating cavity inside, which communicates with the receiving cavity. An air inlet is provided on the side wall of the insulating support to communicate with external gas and the communicating cavity.

[0012] Furthermore, the side wall of the stationary end support is provided with a connecting end for connecting the stationary end conductor, and the heat dissipation port includes a first heat dissipation port provided on the side wall of the stationary end support and arranged directly opposite the connecting end along the radial direction of the stationary end support. The first heat dissipation port also constitutes an operating hole for inserting the heat sink into the stationary end support.

[0013] Furthermore, the heat dissipation vent also includes a second heat dissipation vent disposed on the side wall of the stationary end support and located between the first heat dissipation vent and the connecting end, wherein the area of ​​the second heat dissipation vent is smaller than the area of ​​the first heat dissipation vent.

[0014] Furthermore, there are two second heat dissipation vents, and the arrangement direction of the two second heat dissipation vents is perpendicular to the arrangement direction of the connecting end and the operating hole.

[0015] The beneficial effects of the heat dissipation structure for the stationary end of the vacuum interrupter in this invention are as follows: This invention improves upon the existing heat dissipation structure for the stationary end of the vacuum interrupter by setting a stationary end support to facilitate the discharge of current within the vacuum interrupter. A receiving cavity is provided within the stationary end support, and a heat sink is fixedly installed within the receiving cavity to facilitate the transfer of heat from the stationary end support to the heat sink for heat dissipation. Heat dissipation vents are provided on the side wall of the stationary end support to facilitate the flow of gas within the receiving cavity, enabling heat exchange with the gas outside the stationary end support and facilitating the transfer of heat from the heat sink to the outside of the stationary end support. Since the heat sink is entirely arranged inside the receiving cavity, and the heat sink and the stationary end support have the same potential, no tip discharge will occur between them. The stationary end support also acts as a shield for the heat sink, making it less prone to tip discharge. This solves the problem in the prior art where heat dissipation of the stationary end of the vacuum interrupter involves setting a heat sink protruding from the stationary end support, which easily leads to tip discharge.

[0016] To achieve the above objectives, the vacuum circuit breaker in this invention adopts the following technical solution: A vacuum circuit breaker includes a vacuum interrupter and a heat dissipation structure disposed at the stationary end of the vacuum interrupter. The heat dissipation structure includes a stationary end support for mounting at the stationary end of the vacuum interrupter. The stationary end support has a receiving cavity inside, and a heat sink is fixedly disposed in the receiving cavity. The heat sink includes a heat dissipation part and a mounting part for fixed connection to the stationary end support. The stationary end support is also provided with a heat dissipation port that communicates with external gas and the receiving cavity.

[0017] Furthermore, the stationary end support is provided with fastener mounting holes for installing fasteners to be fixedly connected to the stationary conductive rod in the vacuum interrupter chamber, and the mounting part is provided with fastener clearance grooves for avoiding the fastener mounting holes.

[0018] Furthermore, the heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The center of the radiator is provided with a bolt hole for the fastening bolt to pass through. The bolt hole includes a large-diameter hole located in the heat dissipation part and a small-diameter hole located in the mounting part. A stepped structure is formed between the large-diameter hole and the small-diameter hole. A stepped surface is formed on the stepped structure for engaging with the bolt head stop of the fastening bolt. The fastener clearance grooves are arranged at intervals around the bolt hole.

[0019] Furthermore, the heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The radiator has a bolt hole at its center for the fastening bolt to pass through. The bolt hole has a stepped structure with a stepped surface that engages with the bolt head stop of the fastening bolt.

[0020] Furthermore, the heat dissipation section and the heat dissipation port have an overlapping portion in a direction perpendicular to the axis of the heat sink.

[0021] Furthermore, the end of the stationary support away from the stationary conductive rod is also provided with an insulating support. The insulating support has a communicating cavity inside, which communicates with the receiving cavity. An air inlet is provided on the side wall of the insulating support to communicate with external gas and the communicating cavity.

[0022] Furthermore, the side wall of the stationary end support is provided with a connecting end for connecting the stationary end conductor, and the heat dissipation port includes a first heat dissipation port provided on the side wall of the stationary end support and arranged directly opposite the connecting end along the radial direction of the stationary end support. The first heat dissipation port also constitutes an operating hole for inserting the heat sink into the stationary end support.

[0023] Furthermore, the heat dissipation vent also includes a second heat dissipation vent disposed on the side wall of the stationary end support and located between the first heat dissipation vent and the connecting end, wherein the area of ​​the second heat dissipation vent is smaller than the area of ​​the first heat dissipation vent.

[0024] Furthermore, there are two second heat dissipation vents, and the arrangement direction of the two second heat dissipation vents is perpendicular to the arrangement direction of the connecting end and the operating hole.

[0025] The beneficial effects of the vacuum circuit breaker in this invention are as follows: This invention improves the heat dissipation structure of the stationary end of the vacuum interrupter in the prior art. By setting a stationary end support, it facilitates the discharge of current inside the vacuum interrupter. By setting a receiving cavity inside the stationary end support, and fixing a heat sink inside the receiving cavity, it facilitates the transfer of heat from the stationary end support to the heat sink for heat dissipation. By setting a heat dissipation port on the side wall of the stationary end support, it facilitates the flow of gas inside the receiving cavity and facilitates heat exchange with the gas outside the stationary end support, facilitating the transfer of heat from the heat sink to the outside of the stationary end support. Since the heat sink is arranged entirely inside the receiving cavity, the heat sink and the stationary end support have the same potential, so no tip discharge will occur between the heat sink and the stationary end support. The stationary end support also constitutes a shield for the heat sink, making it less likely for the heat sink to have tip discharge. Thus, it solves the problem in the prior art that the heat dissipation of the stationary end of the vacuum interrupter is caused by setting a heat sink protruding from the stationary end support, which makes the heat sink prone to tip discharge. Attached Figure Description

[0026] Figure 1 This is a front view of an embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter in this invention (the structure of the vacuum interrupter has been added for ease of demonstration). Figure 2 This is a front view of an embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter in this invention; Figure 3 for Figure 2 KK view; Figure 4 This is a top view of the heat sink in an embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter in this invention; Figure 5 This is a front view of the heat sink in an embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter in this invention.

[0027] In the diagram: 1. Vacuum interrupter; 2. Stationary end support; 21. Second heat dissipation port; 22. Mounting end; 23. Connecting end; 24. Operating hole; 3. Radiator; 31. Mounting part; 311. Fastener clearance groove; 32. Heat dissipation part; 321. Groove; 4. Insulating support; 41. Air inlet; 5. Fastening bolt. Detailed Implementation

[0028] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0029] In this invention, a receiving cavity is provided inside the stationary end support to enclose the heat sink inside the stationary end support. Since the heat sink and the stationary end support are at the same potential and are enclosed, the stationary end support also acts as a shield for the heat sink, so no tip discharge will occur on the heat sink.

[0030] In an embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter (hereinafter referred to as the heat dissipation structure) in this invention: like Figure 1 and Figure 2 As shown, in this embodiment, the heat dissipation structure includes a stationary end support 2 for mounting at the stationary end of the vacuum interrupter 1. The stationary end support 2 has a receiving cavity inside, and a heat sink 3 is disposed within the receiving cavity. The heat sink 3 is positioned on the stationary end support 2 at one end facing the vacuum interrupter 1. An insulating support 4 is also provided at the end of the stationary end support 2 away from the vacuum interrupter 1 to support the stationary end support 2. The heat sink 3 includes a mounting portion 31 for fitting and mounting onto the stationary end support 2 and a heat dissipation portion 32 for heat dissipation.

[0031] Specifically, such as Figure 2 and Figure 3As shown, the stationary end support 2 includes an upper end plate and a lower end plate for being arranged at the end of the vacuum interrupter 1, wherein the upper end plate is used to connect the stationary conductive rod inside the vacuum interrupter 1. Fastener mounting holes are provided on the upper end plate; the fasteners must pass through the fastener mounting holes to pass through the stationary end support 2 before the stationary conductive rod can be installed. After installation, a portion of the fastener will protrude from the end face of the upper end plate. Therefore, a fastener clearance groove 311 is also provided on the mounting portion 31 of the radiator 3 to avoid these fasteners and the fastener mounting holes for fastener installation. The fastener clearance groove 311 does not affect the installation of the radiator 3, and at the same time, it allows the radiator 3 to be closer to the stationary conductive rod, facilitating the transfer of heat from the stationary conductive rod. Of course, the fastener can be a pin or a bolt. Alternatively, in other embodiments, when the fastener mounting hole is a countersunk hole, the fastener clearance groove 311 may not be provided.

[0032] like Figure 4 and Figure 5 As shown, the radiator 3 is generally columnar. This heat dissipation structure also includes fastening bolts 5 disposed inside the radiator 3 for fixing the radiator 3 and the stationary end support 2 together. A bolt hole for mounting the fastening bolt 5 is also provided at the axial position of the radiator 3. Specifically, the bolt hole includes a large-diameter hole located in the heat dissipation section 32 and a small-diameter hole located in the mounting section 31. A stepped structure is formed between the large-diameter hole and the small-diameter hole. The stepped structure has a stepped surface for engaging with the bolt head stop of the fastening bolt 5. The stepped surface facilitates the installation structure for bolt mounting, and reducing the inner diameter of the bolt hole in the mounting section 31 also helps to retain a larger contact area with the stationary end support 2, improving the heat dissipation effect. Of course, in other embodiments, the bolt hole may not be provided; instead, an ear plate may be provided at the end of the mounting section 31, and the fastening bolt 5 may be mounted by engaging the ear plate. Alternatively, in other embodiments, the bolt hole may no longer be divided into a large-diameter hole and a small-diameter hole, and an inwardly protruding boss may be provided in the middle of the bolt hole, forming the stepped structure.

[0033] The heat dissipation section 32 is provided with vertically arranged slots 321 spaced apart along the axis of the radiator 3. The slots 321 divide the heat dissipation section 32 into multiple heat dissipation fins, and correspondingly, heat dissipation fins are formed on both sides of the slots 321. The slots 321 increase the contact area between the heat dissipation section 32 and the gas, facilitating sufficient heat exchange. Of course, heat dissipation fins are only one configuration of the heat dissipation section 32. In other embodiments, condenser tubes can also be provided inside the heat dissipation section 32 for heat dissipation.

[0034] like Figure 2 and Figure 3As shown, the heat transfer from the radiator 3 transfers the stationary end support 2 and the stationary conductive rod of the vacuum interrupter 1 to the heat dissipation part 32. The heat is carried away by the gas in contact with the heat dissipation part 32. Therefore, the receiving cavity on the stationary end support 2 cannot be a closed space. A heat dissipation port that can discharge the gas heated by the heat dissipation part 32 is also provided on the stationary end support. In addition, the stationary end support 2 also serves as a circuit connection. A stationary end conductor is also required on the stationary end support 2. Therefore, a connection end 23 is also provided on the stationary end support 2. The heat dissipation port includes a first heat dissipation port located on the side wall of the stationary end support 2 and symmetrically arranged with the connection end 23 about the axis of the stationary end support 2. The first heat dissipation port also constitutes an operation hole 24 for the radiator 3 to be inserted into the stationary end support 2. The radiator 3 can be inserted and fasteners can be installed through the operation hole 24. A second heat dissipation port 21 is also provided between the operation hole 24 and the connection end 23. In order to have enough space to arrange the second heat dissipation port 21, the area of ​​the second heat dissipation port 21 is smaller than the area of ​​the first heat dissipation port. There are two second heat dissipation vents 21, and the arrangement direction of the two second heat dissipation vents 21 and the connection end 23 are perpendicular to the arrangement direction of the operation hole 24.

[0035] Of course, in other embodiments, the number of second heat dissipation vents 21 can also be adjusted, with three or four second heat dissipation vents 21. Alternatively, in other embodiments, only one second heat dissipation vent 21 may be provided. Or, in other embodiments, the arrangement direction of the two second heat dissipation vents 21 and the connection end 23 may not be perpendicular to the arrangement direction of the operating hole 24, but rather they may be arranged at a certain angle. Or, in other embodiments, the area of ​​the second heat dissipation vent 21 may be equal to or greater than the area of ​​the first heat dissipation vent.

[0036] To facilitate gas flow, the insulating support 4 has a connecting cavity that communicates with the receiving cavity. The top of the connecting cavity connects to the bottom of the stationary support 2. Additionally, an air inlet 41 is located on the side wall of the insulating support 4, at the end furthest from the heat dissipation port from the vacuum interrupter 1. When the gas is heated by the radiator 3, its temperature rises, it accumulates at the top of the receiving cavity, and is discharged from the second heat dissipation port 21 and the operating hole 24. Meanwhile, cooler gas enters from the bottom, resulting in air intake through the air inlet 41 and exhaust through the heat dissipation port. The second heat dissipation port 21 and the operating hole 24 also constitute the exhaust port. To better expel hot gas, the heat dissipation part 32 overlaps with the second heat dissipation port 21 in the height direction. The second heat dissipation port 21 and the air inlet 41 are arranged in the same plane to facilitate the exhaust of hot gas. Alternatively, in other embodiments, the connecting cavity may not be provided on the insulating support 4, and the air inlet 41 may also be located on the side wall of the stationary support 2. Alternatively, in other embodiments, the air inlet 41 on the insulating support 4 may be located at the bottom. Alternatively, in other embodiments, the air inlet 41 and the exhaust port may be staggered. Alternatively, in other embodiments, the second heat dissipation port 21 may be located above the heat dissipation section 32, with the two arranged alternately.

[0037] In an embodiment of the vacuum circuit breaker in this invention: In this embodiment, the vacuum circuit breaker includes a vacuum interrupter and a heat dissipation structure arranged at the stationary end of the vacuum interrupter. The heat dissipation structure is the same as the structure in the embodiment of the heat dissipation structure for the stationary end of the vacuum interrupter described above, and will not be repeated here.

[0038] 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 heat dissipation structure for the stationary end of a vacuum interrupter, comprising a stationary end support for mounting at the stationary end of the vacuum interrupter, characterized in that: The stationary end support has an internal cavity, and a radiator is fixedly installed inside the cavity. The radiator includes a heat dissipation part and a mounting part for fixed connection to the stationary end support. The stationary end support also has a heat dissipation port that connects to the external gas and the cavity.

2. The heat dissipation structure for the stationary end of the vacuum interrupter according to claim 1, characterized in that: The stationary end support is provided with fastener mounting holes for installing fasteners to be fixedly connected to the stationary conductive rod inside the vacuum interrupter, and the mounting part is provided with fastener clearance grooves to avoid the fastener mounting holes.

3. The heat dissipation structure for the stationary end of the vacuum interrupter according to claim 2, characterized in that: The heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The center of the radiator is provided with a bolt hole for the fastening bolt to pass through. The bolt hole includes a large-diameter hole located in the heat dissipation part and a small-diameter hole located in the mounting part. A stepped structure is formed between the large-diameter hole and the small-diameter hole. A stepped surface is formed on the stepped structure for engaging with the bolt head stop of the fastening bolt. The fastener clearance grooves are arranged at intervals around the bolt hole.

4. The heat dissipation structure for the stationary end of the vacuum interrupter according to claim 1, characterized in that: The heat dissipation structure for the stationary end of the vacuum interrupter also includes fastening bolts for fixing the radiator and the stationary end support. The radiator has a bolt hole at its center for the fastening bolt to pass through. The bolt hole has a stepped structure with a stepped surface for engaging with the bolt head stop of the fastening bolt.

5. The heat dissipation structure for the stationary end of a vacuum interrupter according to any one of claims 1-4, characterized in that: The heat dissipation section and the heat dissipation port have an overlapping portion in a direction perpendicular to the axis of the heat sink.

6. The heat dissipation structure for the stationary end of a vacuum interrupter according to any one of claims 1-4, characterized in that: The end of the stationary support away from the stationary conductive rod is also provided with an insulating support. The insulating support has a connecting cavity inside, which is connected to the receiving cavity. An air inlet is provided on the side wall of the insulating support to connect external gas and the connecting cavity.

7. The heat dissipation structure for the stationary end of a vacuum interrupter according to any one of claims 1-4, characterized in that: The side wall of the stationary end support is provided with a connecting end for connecting the stationary end conductor. The heat dissipation port includes a first heat dissipation port provided on the side wall of the stationary end support and arranged directly opposite the connecting end along the radial direction of the stationary end support. The first heat dissipation port also constitutes an operating hole for inserting the heat sink into the stationary end support.

8. The heat dissipation structure for the stationary end of the vacuum interrupter according to claim 7, characterized in that: The heat dissipation vent also includes a second heat dissipation vent disposed on the side wall of the stationary end support and located between the first heat dissipation vent and the connecting end, the area of ​​the second heat dissipation vent being smaller than the area of ​​the first heat dissipation vent.

9. The heat dissipation structure for the stationary end of the vacuum interrupter according to claim 8, characterized in that: There are two second heat dissipation vents, and the arrangement direction of the two second heat dissipation vents is perpendicular to the arrangement direction of the connection end and the operation hole.

10. A vacuum circuit breaker, comprising a vacuum interrupter and a heat dissipation structure disposed at the stationary end of the vacuum interrupter, characterized in that: The heat dissipation structure is the same as the heat dissipation structure for the stationary end of the vacuum interrupter as described in any one of claims 1-9.

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