Arc extinguishing system and switch cabinet

Abstract

The utility model discloses an arc extinguishing system and a switch cabinet. The arc extinguishing system is arranged in the switch cabinet. The arc extinguishing system comprises a static contact; an arc extinguish chamber configured to extinguish an arc; the electric connecting piece has a cylindrical shape, and the static contact is electrically connected to the arc extinguish chamber through the electric connecting piece; wherein the arc extinguishing system further comprises a heat sink, the heat sink is arranged between the static contact and the arc extinguishing chamber, the heat sink at least partially surrounds the electric connecting piece, and the heat sink is configured to dissipate heat at the electric connecting piece to the outside.

Description

Technical Field

[0001] This utility model relates to an arc extinguishing system and a switch cabinet, specifically, to an arc extinguishing system and a corresponding switch cabinet with better heat dissipation performance. Background Technology

[0002] In medium-voltage switchgear, good insulation and heat dissipation performance are crucial. Sulfur hexafluoride (SF6) has good insulation and heat dissipation properties, and is therefore widely used in medium-voltage switchgear. However, SF6 contributes significantly to the greenhouse effect, with a global warming potential 25,200 times that of carbon dioxide. To meet environmental protection requirements, the gas used to fill medium-voltage switchgear is being replaced with dry air, but this has led to a decrease in the insulation and heat dissipation performance of the switchgear.

[0003] Therefore, it is hoped that an arc extinguishing system and switchgear can be proposed to improve the deficiencies in the above-mentioned prior art. Utility Model Content

[0004] According to a first aspect of the present invention, an arc extinguishing system is provided, comprising: a stationary contact; an arc extinguishing chamber configured to extinguish an electric arc; and an electrical connector having a cylindrical shape, wherein the stationary contact is electrically connected to the arc extinguishing chamber via the electrical connector; wherein the arc extinguishing system further comprises a heat sink disposed between the stationary contact and the arc extinguishing chamber, the heat sink at least partially surrounding the electrical connector, and the heat sink being configured to dissipate heat at the electrical connector to the outside.

[0005] According to this scheme, by arranging a heat sink between the stationary contact and the arc-extinguishing chamber, the heat generated by the arc-extinguishing system can be fully dissipated to the outside, thereby improving the heat dissipation performance of the switchgear.

[0006] In some designs, the radiator may include a housing and fins, with the housing having a smooth shape and the fins arranged inside the housing.

[0007] According to this design, the smooth shape of the housing makes the electric field distribution inside the switch cabinet more uniform, thereby improving the insulation performance of the switch cabinet.

[0008] In some designs, the extent of the housing may not exceed that of the arc-extinguishing chamber in the lateral direction, which is perpendicular to the axial direction of the electrical connector.

[0009] According to this scheme, installing heat sinks will not reduce the insulation distance between phases, and therefore will not reduce the insulation performance of the switchgear.

[0010] In some designs, the housing may have a first part and a second part, the first part being arc-shaped and the second part being a chamfered rectangle.

[0011] In some designs, the fins can have a circular or rectangular profile.

[0012] In some designs, there may be a gap between the radiator and the stationary contact, and / or, there may be a gap between the radiator and the arc-extinguishing chamber.

[0013] According to this design, there are gaps between the radiator and the stationary contact and the arc-extinguishing chamber, which allows for more efficient gas convection inside the switch cabinet, thereby better removing heat and improving the heat dissipation performance of the switch cabinet.

[0014] In some designs, the circumferential surface of the electrical connector has a groove that is recessed inward along the radial direction of the electrical connector.

[0015] According to this design, the radiator is partially embedded in the groove of the electrical connector, making the fixation between the radiator and the electrical connector more secure.

[0016] In some designs, the arc-extinguishing system may also include fastening screws that pass sequentially through the stationary contact, the electrical connector, and the arc-extinguishing chamber to secure the stationary contact, the electrical connector, and the arc-extinguishing chamber together.

[0017] According to this scheme, the heat sink is fixed between the stationary contact and the arc-extinguishing chamber by fastening screws, without the need for additional fixing devices.

[0018] In some embodiments, the arc extinguishing system may also include a first limiting screw and a second limiting screw, the first limiting screw passing through the stationary contact and the electrical connector, and the second limiting screw passing through the arc extinguishing chamber and the electrical connector, the first limiting screw and the second limiting screw being configured to limit the displacement of the electrical connector in the lateral direction.

[0019] According to this scheme, the limit screws prevent undesirable lateral displacement of electrical connectors, which would reduce the insulation distance and thus improve the insulation performance of the switchgear.

[0020] In some designs, electrical connectors can be made of copper, and heat sinks can be made of aluminum.

[0021] According to a second aspect of the present invention, a switch cabinet is provided, wherein the arc extinguishing system described in the first aspect of the present invention is arranged in the switch cabinet.

[0022] According to this plan, the heat dissipation performance of the switch cabinet is improved because the arc extinguishing system is equipped with a heat sink.

[0023] In some designs, the switch cabinet can be filled with dry air.

[0024] According to this plan, because the switchgear has good heat dissipation performance, sulfur hexafluoride is no longer needed as a filling gas in the switchgear, which reduces the emission of sulfur hexafluoride as a greenhouse gas and meets the corresponding green and environmental protection requirements. Attached Figure Description

[0025] Figure 1 A schematic diagram of an arc-extinguishing system according to an embodiment of the present invention is shown;

[0026] Figure 2 A cross-sectional view of an arc-extinguishing system according to an embodiment of the present invention is shown;

[0027] Figure 3 A schematic diagram of a heat sink according to an embodiment of the present invention is shown;

[0028] Figure 4 A schematic diagram of a heat sink according to an alternative embodiment of the present invention is shown;

[0029] Figure 5 A schematic diagram of a heat sink according to an alternative embodiment of the present invention is shown;

[0030] Figure 6 A schematic diagram of a heat sink according to an alternative embodiment of the present invention is shown;

[0031] Figure 7 A schematic diagram of a heat sink according to an alternative embodiment of the present invention is shown.

[0032] Figure label:

[0033] 10 cabinets

[0034] 100 Arc Extinguishing System

[0035] 110 stationary contact

[0036] 120 Arc Extinguishing Chamber

[0037] 130 Copper Pillars

[0038] 132 Groove

[0039] 140 radiator

[0040] 142 Casing

[0041] 142-1 Part 1

[0042] 142-2 Part Two

[0043] 144 fins

[0044] 150 Fastening Screws

[0045] 162 First limit screw

[0046] 164 Second limit screw Detailed Implementation

[0047] To make the objectives, solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0048] Figure 1 A schematic diagram of an arc-extinguishing system 100 according to an embodiment of the present invention is shown. The arc-extinguishing system 100 is arranged in a switch cabinet (only a portion of the cabinet 10 is shown). The arc-extinguishing system 100 mainly includes a stationary contact 110, an arc-extinguishing chamber 120, and a copper column 130 (e.g., ...). Figure 2 (As shown). The stationary contact 110 controls the opening and closing of the circuit by contacting and separating from the moving contact. The stationary contact 110 is electrically connected to the arc-extinguishing chamber 120 via a copper post 130. Specifically, the stationary contact 110 can be, for example, the stationary contact of a three-position switch. The arc-extinguishing chamber 120 is configured to extinguish an electric arc when it is generated. The arc-extinguishing chamber 120 can be, for example, a vacuum arc-extinguishing chamber. The generally cylindrical copper post 130 acts as the electrical connection between the stationary contact 110 and the arc-extinguishing chamber 120 so that the arc can be extinguished by the arc-extinguishing chamber 120. The diameter of the copper post 130 can depend on the current it carries. For carrying a relatively large current (e.g., greater than 1250A), the copper post 130 can have a relatively large diameter, and for carrying a relatively small current (e.g., less than 1250A), the copper post 130 can have a relatively small diameter. It should be understood that the copper pillar 130 is merely exemplary, and the present invention may also use electrical connectors 130 made of any other suitable material.

[0049] Figure 2 A cross-sectional view of an arc-extinguishing system 100 according to an embodiment of the present invention is shown. To improve the heat dissipation performance of the arc-extinguishing system 100, the arc-extinguishing system 100 further includes a radiator 140, which is arranged between the stationary contact 110 and the arc-extinguishing chamber 120, and the radiator 140 at least partially surrounds the copper pillar 130. Specifically, the radiator 140 can surround most of the outer periphery of the copper pillar 130, except for a small portion of the copper pillar 130 near the stationary contact 110 and the arc-extinguishing chamber 120. In other words, there are gaps between the radiator 140 and the stationary contact 110, and there are gaps between the radiator 140 and the arc-extinguishing chamber. The existence of these gaps facilitates airflow to remove heat, thereby improving the heat dissipation performance of the arc-extinguishing system 100. The radiator 140 and the copper pillar 130 are formed as an integral component, with the central copper pillar 130 serving a conductive function and the external radiator 140 serving a heat dissipation function. In this way, the integrated component simultaneously performs both conductive and heat dissipation functions, simplifying the structure of the arc-extinguishing system 100.

[0050] Figure 3A schematic diagram of a heat sink 140 according to an embodiment of the present invention is shown. The heat sink 140 includes a housing 142 and fins 144. Preferably, the heat sink 140 may be made of aluminum. The housing 142 has a generally smooth shape, and the fins 144 are arranged inside the housing 142. It should be understood that the generally smooth shape of the housing 142 means that there are no sharp points on the outer contour of the housing 142. This avoids the electric field from concentrating at the sharp points and breaking down the insulating gas, thereby improving the insulation performance of the arc-extinguishing system 100. The housing 142 is crucial to the insulation performance of the heat sink 140 because the fins 144 are generally formed with multiple protrusions, which can easily cause the electric field to concentrate at the protrusions, thus degrading the insulation performance. The housing 142 can enclose the protrusions of the fins 144 inside the housing 142 (i.e., shielded by the electric field of the housing 142), thereby improving the insulation performance of the heat sink 140. The fins 144 have multiple grooves, which increases the heat dissipation area of ​​the radiator 140 and allows airflow to flow fully in the radiator 140, thereby improving the heat dissipation performance of the arc extinguishing system 100.

[0051] Preferably, in the lateral direction (the direction perpendicular to the axial direction of the copper pillar 130), the range of the housing 142 does not exceed the range of the arc-extinguishing chamber 120. For multi-phase circuits (e.g., three-phase circuits), phase-to-phase insulation is an important performance characteristic. The fact that the range of the housing 142 in the lateral direction does not exceed the arc-extinguishing chamber 120 ensures that the installation of the heat sink 140 will not reduce the phase-to-phase insulation distance, thereby preventing the insulation performance of the arc-extinguishing system 100 from deteriorating due to the installation of the heat sink 140.

[0052] Preferably, the circumferential surface of the copper pillar 130 is provided with a groove 132, which is recessed inward along the radial direction of the copper pillar 130. Thus, during the manufacture of the arc-extinguishing system 100, the heat sink 140 can be partially embedded in the groove 132 in the copper pillar 130, resulting in a stronger bond between the heat sink 140 and the copper pillar 130. Specifically, the circumferential surface of the copper pillar 130 may be provided with two grooves 132, one relatively close to the stationary contact 110 and the other relatively close to the arc-extinguishing chamber 120. It should be understood that this invention is not intended to limit the number and arrangement of the grooves 132; the copper pillar 130 may be provided with any other suitable number of grooves 132, and the grooves 132 may be arranged in any other suitable position on the copper pillar 130.

[0053] Preferably, the arc-extinguishing system 100 may further include a fastening screw 150, which passes sequentially through the stationary contact 110, the copper pillar 130, and the arc-extinguishing chamber 120 to secure the stationary contact 110, the copper pillar 130, and the arc-extinguishing chamber 120 together. In this way, the radiator 140 is fixed between the stationary contact 110 and the arc-extinguishing chamber 120 by the fastening screw 150 without requiring additional fixing devices. Furthermore, the arc-extinguishing system 100 may also include a first limiting screw 162 and a second limiting screw 164, where the first limiting screw 162 passes through the stationary contact 110 and the copper pillar 130, and the second limiting screw 164 passes through the arc-extinguishing chamber 120 and the copper pillar 130. The first limiting screw and the second limiting screw 164 are configured to limit the displacement of the copper pillar 130 in the lateral direction. The first limiting screw 162 and the second limiting screw 164 prevent the copper column 130 from shifting undesirably and causing a reduction in the interphase insulation distance, thereby improving the insulation performance of the arc extinguishing system 100.

[0054] like Figure 3 As shown, the housing 142 may have a first part 142-1 and a second part 142-2. The first part 142-1 may be arc-shaped (e.g., semi-circular), and the second part 142-2 may be a chamfered rectangle. The chamfer can prevent the housing 142 from having sharp points that would reduce the insulation performance of the arc-extinguishing system 100. The second part 142-2 may be adjacent to the cabinet 10 of the switchgear, and the specific shape of the second part 142-2 may also be designed differently depending on the accommodation space provided by the cabinet 10.

[0055] It should be understood that this invention is not intended to limit the specific shape of the housing 142 (i.e., the shape of the outer contour of the fins 144). In the second embodiment of this invention, as... Figure 4 As shown, the housing 142 has a complete circular shape, and the fins 144 have a circular outer contour. This results in a better uniformity of the electric field distribution around the housing 142, avoiding the deterioration of insulation performance caused by electric field concentration. In the third embodiment of this utility model, as... Figure 5 As shown, the shell 142 has a chamfered square shape, and the fins 144 have a generally square outer contour. In the fourth embodiment of this utility model, as... Figure 6 As shown, the shell 142 has a chamfered rectangular shape, and the fins 144 have a generally rectangular outer contour. Figure 5 and Figure 6 In the heat sink 140 shown, the chamfering prevents the housing 142 from having sharp points that could reduce the insulation performance of the arc-extinguishing system 100. In the fifth embodiment of the present invention, the housing 142 has a chamfered rectangular shape, and the fins 144 have a generally rectangular outer contour. Unlike the fourth embodiment, the fifth embodiment has a relatively small number of fins 144. The present invention is not intended to limit the number of fins 144, and the heat sink 140 may include any suitable number of fins 144.

[0056] According to the above embodiments, the arc-extinguishing system 100 proposed in this invention has good insulation and heat dissipation performance. This is particularly important for environmentally friendly switchgear, because sulfur hexafluoride gas, traditionally used for heat dissipation and insulation, has a strong greenhouse effect. Therefore, for environmental protection requirements, sulfur hexafluoride gas is replaced with dry air. Dry air has lower thermal conductivity and insulation properties than sulfur hexafluoride, thus placing higher demands on the heat dissipation and insulation performance of the switchgear. Therefore, this invention proposes an arc-extinguishing system 100 that, while replacing the gas filling the switchgear with dry air to meet environmental requirements, still satisfies the required insulation and heat dissipation performance of the switchgear.

[0057] This document describes in detail several exemplary embodiments of the present disclosure with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present disclosure, and various technical features and structures proposed in the present disclosure can be combined without exceeding the protection scope of the present disclosure, the protection scope of the present disclosure being determined by the appended claims.

Claims

1. An arc-extinguishing system, characterized in that, include: Static contact head; An arc-extinguishing chamber is configured to extinguish electric arcs. An electrical connector having a cylindrical shape, wherein the stationary contact is electrically connected to the arc-extinguishing chamber via the electrical connector; The arc-extinguishing system further includes a radiator disposed between the stationary contact and the arc-extinguishing chamber, the radiator at least partially surrounding the electrical connector, and the radiator being configured to dissipate heat at the electrical connector to the outside.

2. The arc-extinguishing system according to claim 1, characterized in that, The radiator includes a housing and fins, the housing having a smooth shape and the fins being arranged inside the housing.

3. The arc-extinguishing system according to claim 2, characterized in that, In the lateral direction, the range of the housing does not exceed the range of the arc-extinguishing chamber, and the lateral direction is perpendicular to the axial direction of the electrical connector.

4. The arc-extinguishing system according to claim 2, characterized in that, The housing has a first part and a second part, the first part being arc-shaped and the second part being a chamfered rectangle.

5. The arc-extinguishing system according to claim 2, characterized in that, The fins have a circular or rectangular outline.

6. The arc-extinguishing system according to claim 1, characterized in that, There is a gap between the radiator and the stationary contact, and / or there is a gap between the radiator and the arc-extinguishing chamber.

7. The arc-extinguishing system according to claim 1, characterized in that, The electrical connector has a groove on its circumferential surface, and the groove is recessed inward along the radial direction of the electrical connector.

8. The arc-extinguishing system according to claim 1, characterized in that, It also includes fastening screws that pass sequentially through the stationary contact, the electrical connector, and the arc-extinguishing chamber to secure the stationary contact, the electrical connector, and the arc-extinguishing chamber together.

9. The arc-extinguishing system according to claim 1, characterized in that, It also includes a first limiting screw and a second limiting screw, the first limiting screw passing through the stationary contact and the electrical connector, and the second limiting screw passing through the arc-extinguishing chamber and the electrical connector, the first limiting screw and the second limiting screw being configured to limit the displacement of the electrical connector in the lateral direction.

10. The arc-extinguishing system according to claim 1, characterized in that, The electrical connector is made of copper, and the heat sink is made of aluminum.

11. A switch cabinet, characterized in that, The arc extinguishing system according to any one of claims 1 to 10 is arranged in the switch cabinet.

12. The switchgear according to claim 11, characterized in that, The switch cabinet is filled with dry air.

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