Solid-sealed polar pole

Abstract

The utility model provides a solid-sealed polar pole, which comprises an insulating shell, and an upper wire outlet seat, a vacuum arc-extinguishing chamber, a conductive clamp, a flexible connector, a lower wire outlet seat and an insulating pull rod which are arranged in the insulating shell, the upper wire outlet seat is fixed and electrically connected to a static contact end of the vacuum arc-extinguishing chamber, and the lower wire outlet seat is fixed and electrically connected to a static contact end of the vacuum arc-extinguishing chamber. A moving contact end of the vacuum arc-extinguishing chamber is electrically connected to the lower wire outlet seat through the conductive clamp and the flexible connection, one end part of the insulating pull rod is fixed to the moving contact end of the vacuum arc-extinguishing chamber, the lower wire outlet seat is arranged on the radial outer side of the conductive clamp, the flexible connection comprises a plurality of flexible connection assemblies, and the flexible connection assemblies are connected with the insulating pull rod. And the plurality of flexible connection assemblies are uniformly arranged between the conductive clamp and the lower wire outlet seat at equal angles.

Description

Technical Field

[0001] The utility model belongs to the field of electrical switches, and in particular relates to a sealed pole. Background Art

[0002] The statements in this section are only intended to provide background information related to the present invention to help understand the present invention. Such background information does not necessarily constitute prior art.

[0003] The sealed pole is formed by embedding the vacuum interrupter and the conductive parts related to the circuit breaker into easily solidified solid insulating materials such as epoxy resin or thermoplastic materials.

[0004] With the development of new energy, the demand for 24kV high-current vacuum circuit breakers is increasing in the polysilicon and other photovoltaic industries. Currently, the switchgear industry utilizes a spring contact structure for the moving-end connection of the fixed-pole arc extinguishing chamber of 24kV high-current circuit breakers. This structure requires high machining precision, increases the cost of the pole, and also places higher demands on the temperature rise of the moving-end of the arc extinguishing chamber. Furthermore, circuit breakers suitable for use at altitudes of 3000m are extremely rare and expensive. Therefore, a flexible connection structure is needed to provide a low-cost, highly reliable solution for high-current fixed-pole operation at high altitudes. Utility Model Content

[0005] Therefore, the purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a sealed pole, characterized in that it includes an insulating shell and an upper outlet seat, a vacuum arc chamber, a conductive clamp, a soft connection, a lower outlet seat and an insulating pull rod arranged inside the insulating shell, wherein the upper outlet seat is fixed and electrically connected to the static contact end of the vacuum arc chamber, the moving contact end of the vacuum arc chamber is electrically connected to the lower outlet seat through the conductive clamp and the soft connection, one end of the insulating pull rod is fixed to the moving contact end of the vacuum arc chamber, and the lower outlet seat is arranged radially outside the conductive clamp, wherein the soft connection includes a plurality of soft connection components, and the plurality of soft connection components are evenly arranged at equal angles between the conductive clamp and the lower outlet seat.

[0006] According to the sealed pole of the present invention, preferably, the flexible connection comprises a first flexible connection component, a second flexible connection component, a third flexible connection component and a fourth flexible connection component that are evenly arranged at an angle of 90 degrees.

[0007] According to the sealed pole of the present invention, preferably, the conductive clip has a first cavity and a second cavity connected to each other, the shape of the first cavity matches the shape of the moving contact end of the vacuum arc chamber, and the second cavity matches the shape of one end of the insulating pull rod.

[0008] According to the sealed pole of the present invention, preferably, a flange portion is provided on the middle portion of the outer side of the conductive clip.

[0009] According to the sealed pole of the present invention, preferably, each of the multiple soft connection components includes a pair of relatively arranged soft connection parts, and the soft connection parts include a first arm, a second arm and a bridging arm connecting the first arm and the second arm, and the length of the first arm is less than the length of the second arm.

[0010] According to the sealed pole of the present invention, preferably, the first arm of one of the pair of oppositely arranged flexible connectors is fixed to the outer side wall of the conductive clip above the flange portion, the first arm of the other of the pair of oppositely arranged flexible connectors is fixed to the outer side wall of the conductive clip below the flange portion, and the second arm of each of the pair of oppositely arranged flexible connectors is fixed to the lower wire outlet seat.

[0011] According to the sealed pole of the present invention, preferably, the lower outlet seat has an inner cavity, and the second arm of each of the pair of oppositely arranged flexible connectors is fixed to the side wall of the inner cavity of the lower outlet seat.

[0012] According to the sealed pole of the present invention, preferably, the external area of ​​the insulating shell between the upper outlet seat and the lower outlet seat includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along the longitudinal axis, and the size of the first umbrella skirt portion along the direction perpendicular to the longitudinal axis is different from the size of the second umbrella skirt portion along the direction perpendicular to the longitudinal axis.

[0013] According to the sealed pole of the present invention, preferably, the external area of ​​the insulating shell between the lower outlet seat and the bottom plate mounting surface of the sealed pole includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along the longitudinal axis, and the size of the first umbrella skirt portion along the direction perpendicular to the longitudinal axis is different from the size of the second umbrella skirt portion along the direction perpendicular to the longitudinal axis.

[0014] According to the embedded pole of the present invention, preferably, the outer areas of the insulating shell on both sides of the lower outlet seat include ear-shaped umbrella skirt parts.

[0015] According to the sealed pole of the present invention, preferably, the insulating pull rod includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along the longitudinal axis, and the size of the first umbrella skirt portion along the direction perpendicular to the longitudinal axis is different from the size of the second umbrella skirt portion along the direction perpendicular to the longitudinal axis.

[0016] According to the sealed pole of the present invention, preferably, it further comprises a heat sink, and the heat sink is fixed to the upper end surface of the upper outlet seat.

[0017] Compared with the existing technology, the utility model has stable structural performance, good electrical conductivity, heat dissipation and insulation performance, low cost, and is particularly suitable for high-altitude and high-current working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0019] Figure 1 is a cross-sectional view of a sealed pole according to an embodiment of the present utility model;

[0020] Figure 2 According to the embodiment of the present invention Figure 1 A front view of the sealed pole observed from AA';

[0021] Figure 3 A three-dimensional view of an upper outlet socket according to an embodiment of the present utility model;

[0022] Figure 4 is a cross-sectional view of a conductive clip according to an embodiment of the present utility model;

[0023] Figure 5 is a top view of a conductive clip according to an embodiment of the present utility model;

[0024] Figure 6 A three-dimensional view of a lower outlet seat according to an embodiment of the present utility model;

[0025] Figure 7 This is a three-dimensional view of a flexible connector according to an embodiment of the present invention;

[0026] Figure 8 A three-dimensional view of a shielding cover according to an embodiment of the present invention; and

[0027] Figure 9 It is a three-dimensional view of a heat dissipation rack according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The embodiment of the present utility model provides a sealed pole. Figure 1 The cross-sectional view of the sealed pole according to the embodiment of the present invention is shown in FIG. Figure 2 Along the shown Figure 1The front view of the sealed pole observed by AA', the sealed pole includes an epoxy resin insulating shell 10 and an upper outlet seat 2, a vacuum arc chamber 3, a conductive clamp 6, a soft connection 7, a lower outlet seat 8 and an insulating pull rod 9 arranged inside the epoxy resin insulating shell 10, wherein the upper outlet seat 2 and the lower outlet seat 8 are important components for connecting the conductive end of the vacuum arc chamber 3 with the external circuit, the upper outlet seat 2 and the static contact end of the vacuum arc chamber 3 are electrically connected by bolts, the moving contact end of the vacuum arc chamber 3 is electrically connected to the lower outlet seat 8 through the conductive clamp 6 and the soft connection 7, the lower outlet seat 8 is arranged on the radial outside of the conductive clamp 6, the insulating pull rod 9 is fixedly connected to the moving contact end of the vacuum arc chamber 3, and the moving contact of the vacuum arc chamber 3 is driven by the insulating pull rod 9 to realize the opening and closing of the vacuum arc chamber 3. The flexible connection 7 is used to provide a conductive path between the moving contact end of the vacuum interrupter 3 and the external circuit, which enables the moving contact end to have good mechanical flexibility during opening and closing operations, and can move smoothly, reducing mechanical stress and wear; in addition, when current passes through, the flexible connection can absorb part of the thermal stress caused by the current and prevent mechanical stress concentration caused by thermal expansion; in addition, the flexible connection is usually made of a material with good conductive properties (such as copper), which can help dissipate heat and improve the thermal stability of the entire sealed pole.

[0030] exist Figure 1 In the embodiment shown, the static contact end of the vacuum interrupter 3 is a threaded hole structure, and the moving contact end is a tapered rod. Figure 3 The three-dimensional view of the upper outlet base 2 of this embodiment is shown, which includes a first threaded hole 201 disposed in the center of the main body of the upper outlet base 2. The static contact end face of the vacuum interrupter 3 contacts the lower end face of the upper outlet base 2, aligning the static contact threaded hole structure and the first threaded hole 201, and then fastening the connection via bolts. In another embodiment, the static contact end of the vacuum interrupter 3 is a threaded column structure that screws into the first threaded hole 201 to securely connect the vacuum interrupter 3 and the upper outlet base 2.

[0031] See also Figure 4 and Figure 5The cross-sectional view and top view of the conductive clip 6 of the embodiment of the present invention are respectively shown. The conductive clip 6 is a block-shaped structure, and has a conical cavity 601 and a T-shaped cavity 602 that are connected to each other inside, and a flange portion 603 is provided in the middle of the outer side. The shape of the conical cavity 601 of the conductive clip 6 matches the shape of the conical rod moving contact of the vacuum interrupter 3, and they are electrically connected to each other by an interference fit. The T-shaped cavity 602 of the conductive clip 6 has an internal thread, and one end of the insulating pull rod 9 has an external thread. This end of the insulating pull rod 9 is screwed into the T-shaped cavity 602 of the conductive clip 6 to achieve a rigid connection with the moving contact end of the vacuum interrupter 3. The insulating pull rod 9 completes the opening and closing of the circuit breaker through the upper and lower forces. It will be understood by those skilled in the art that the conductive clip 6 and the moving contact end of the vacuum interrupter 3 can have any shape that is compatible with each other and can achieve an interference fit.

[0032] See also Figure 6 The three-dimensional view of the lower outlet seat 8 of the embodiment of the present invention is shown, and the lower outlet seat 8 has an inner cavity 800, and the inner cavity is provided with a first side wall 801, a second side wall 802, a third side wall 803 and a fourth side wall 804 that are evenly arranged in four equal parts at a 90-degree angle. Each side wall is provided with an assembly hole for assembling soft connectors; the upper end face of the inner cavity is open, and the lower end face is provided with a circular hole portion through which the insulating pull rod 9 can pass. In the embodiment of the present invention, the evenly arranged in four equal parts at a 90-degree angle means that the four components (for example, the first to fourth side walls 801-804) have the same shape, are distributed throughout the circumference, and the angle between two adjacent components is 90 degrees, for example, the four components form a square structure. Preferably, as Figure 6 As shown, each side wall is transitioned through an arc surface. This chamfered structure can reduce stress concentration and improve the durability of the parts.

[0033] See also Figure 7 The three-dimensional view of one of the flexible connectors of the flexible connector 7 of the embodiment of the present invention is shown. The flexible connector is a roughly U-shaped structure, including a first arm 701, a second arm 702 and a bridge arm 703 connecting the first arm 701 and the second arm 702. The length of the first arm 701 is less than the length of the second arm 702. Figure 1, two flexible connectors are arranged relative to each other to form a flexible connector assembly, wherein the longer second arms of the two flexible connectors abut against each other and are fixed to the lower outlet seat 8, and the shorter first arms respectively abut against the upper and lower edges of the flange portion 603 and are fixed to the conductive clip 6. Specifically, the first arm of the first flexible connector of the flexible connector assembly is fixed to the upper portion of the side wall of the conductive clip 6 (above the flange portion 603) by, for example, bolt fastening, the lower edge of the first arm abuts against the upper edge of the flange portion 603 of the conductive clip 6, and the second arm is fixed to one side wall of the lower outlet seat 8 by, for example, bolt fastening. The first arm of the second flexible connector of the flexible connector assembly is fixed to the lower portion of the side wall of the conductive clip 6 (below the flange portion 603) by, for example, bolt fastening, the upper edge of the first arm abuts against the lower edge of the flange portion 603 of the conductive clip 6, and the second arm is fixed to one side wall of the lower outlet seat 8 by, for example, bolt fastening. In the embodiment of the present invention, the length of the flexible connector is set to have a gap between the bridging arm 703 of the second flexible connector of the flexible connector assembly and the lower end surface of the lower outlet seat 8, so that no electrical connection is generated between the flexible connector and the lower end surface of the lower outlet seat 8, and the gap is preferably 20mm. Figure 1 In the embodiment shown, four flexible connection components as described above are included, which correspond to the first side wall 801, the second side wall 802, the third side wall 803 and the fourth side wall 804 of the inner cavity 800 of the lower outlet seat 8, respectively, and are evenly arranged in four equal parts at a 90-degree angle (the angle between adjacent flexible connection components is 90 degrees). This symmetrical arrangement makes the force more uniform, the current carrying more balanced, and is also conducive to heat dissipation, making it more suitable for high-current working conditions.

[0034] In embodiments of the present invention, the inner cavity 800 of the flexible connector 7 and the lower outlet holder 8 is not limited to being evenly divided into four equal parts at a 90-degree angle. Any evenly arranged arrangement at equal angles can achieve uniform force distribution and balanced current carrying, making it suitable for high-current operating conditions. In the present invention, the term "evenly arranged at equal angles" means that multiple components are arranged in rotational symmetry about the conductive clip, and the angles between adjacent components are equal. "Equal angles" refers to the size of the angle between adjacent components. For example, in one embodiment, the inner cavity 800 of the lower outlet holder 8 has a first sidewall and a second sidewall arranged opposite each other, and the flexible connector 7 includes two flexible connector components evenly arranged at a 180-degree angle, respectively fixed to the first and second sidewalls of the inner cavity 800. In another embodiment, the inner cavity 800 of the lower outlet holder 8 has a first sidewall, a second sidewall, and a third sidewall evenly arranged at a 120-degree angle, and the flexible connector 7 includes three flexible connector components evenly arranged at a 120-degree angle, respectively fixed to the first, second, and third sidewalls of the inner cavity 800. In yet another embodiment, the inner cavity 800 of the lower outlet seat 8 has first to fifth side walls evenly arranged at a 72-degree angle, and the flexible connection 7 includes five flexible connection components evenly arranged at a 72-degree angle and respectively fixed to the first to fifth side walls of the inner cavity 800. In a further embodiment, the inner cavity 800 of the lower outlet seat 8 has first to sixth side walls evenly arranged at a 60-degree angle, and the flexible connection 7 includes six flexible connection components evenly arranged at a 60-degree angle and respectively fixed to the first to sixth side walls of the inner cavity 800.

[0035] In various embodiments of the present invention, the inner cavity 800 and the flexible connection 7, which are evenly arranged in four equal parts at a 90-degree angle, meet the temperature rise requirement of 4000*1.1 times and the long-term current-carrying operation requirement of 4000AC, and are therefore a better solution for high-current working conditions.

[0036] Preferably, a shielding cover 5 is provided between the lower end of the arc extinguishing chamber 3 and the upper end of the lower outlet seat 8, such as Figure 8 The three-dimensional view of the shielding cover 5 of this embodiment is shown. The shielding cover 5 is a basin-shaped structure, including a first end face and a second end face. The size of the first end face is larger than that of the second end face. The first end face is open, and the edge of the open face is snapped to the edge of the upper end face of the lower outlet seat 8. The second end face of the shielding cover 5 abuts the lower end face of the arc extinguishing chamber 3. The second end face has a through hole through which the moving contact end of the arc extinguishing chamber 3 can pass. In this way, the conductive clip 6, the flexible connection 7 and the moving contact end of the arc extinguishing chamber 3 are all arranged in the shielding cavity formed by the inner cavity of the shielding cover 5 and the lower outlet seat 8, realizing external annular shielding, greatly improving the electric field strength inside the pole, and effectively improving the insulation performance of the sealed pole, making the sealed pole more suitable for high-altitude working conditions.

[0037] See also Figure 1 and Figure 2The epoxy resin housing 10 employs a multi-layered layout with large and small sheds in the portion between the upper outlet seat 2 and the lower outlet seat 8, and in the portion between the lower outlet seat 8 and the pole base mounting surface. Specifically, the exterior of the epoxy resin housing 10 is provided with first shed portions 1001 and second shed portions 1002, alternating along the longitudinal axis. The dimensions of the first shed portions 1001 perpendicular to the longitudinal axis differ from those of the second shed portions 1002. This arrangement further meets the insulation requirements of the circuit breaker operating at high altitudes (e.g., 3,000 meters). According to other embodiments of the present invention, the epoxy resin housing 10 employs a multi-layered layout with large and small sheds in the portion between the upper outlet seat 2 and the lower outlet seat 8, or between the lower outlet seat 8 and the pole base mounting surface.

[0038] See also Figure 2 The epoxy resin shell 10 is provided with ear-shaped umbrella skirts 1003 on both sides of the lower outlet seat 8. The ear-shaped umbrella skirts 1003 can increase the creepage distance between the end of the lower outlet seat 8 of the sealed pole and the circuit breaker mechanism box, thereby improving the insulation level of the circuit breaker; it can also enhance the overall mechanical strength of the pole and prevent damage from sudden external forces. In addition, the novel and unique appearance of the ear-shaped umbrella skirts 1003 enhances the sensory experience of the circuit breaker product.

[0039] In addition, if Figure 1 As shown, the insulating pull rod 9 also adopts a large and small shed spacing design structure with a large creepage distance, which greatly improves the insulation level of the sealed pole relative to the ground, allowing the sealed pole to further meet the use conditions of high-altitude working conditions.

[0040] Preferably, if Figure 1 As shown, the encapsulated pole according to the embodiment of the present invention further includes a heat sink 1, which is fixed to the upper end surface of the upper outlet seat 2 by, for example, bolt fastening. The heat generated in the conductive circuits such as the vacuum interrupter 3 and the upper outlet seat 2 of the encapsulated pole is transferred to the heat sink 1 by heat conduction. The heat sink 1 then dissipates the heat into the air by, for example, convection, conduction, or thermal radiation. Figure 9 The three-dimensional view of the heat sink 1 of the embodiment of the present invention is shown. The heat sink 1 includes a central portion and heat dissipation fins radiating radially outward from the central portion. The central portion is provided with threaded holes (not shown in the figure), which are aligned with the threaded holes 202 and 203 of the upper outlet seat 2 and fastened by bolts. The outer contour of the heat sink 1 is a quasi-circular structure, which includes at least one straight edge. This structure can achieve both insulation and heat dissipation performance. Specifically, as shown in FIG. Figure 9 As shown, the outer contour of the heat dissipation rack 1 includes first to third arcuate edges 101-103 and a straight edge 104. Preferably, adjacent edges are transitioned through another arcuate edge. This chamfered structure can reduce stress concentration and improve the durability of the parts.

[0041] In another embodiment, preferably, the vacuum interrupter 3 is encapsulated by a silicone layer 4 . The silicone layer 4 can protect the vacuum interrupter 3 and effectively dampen external forces.

[0042] According to other embodiments of the present invention, the epoxy resin housing 10 is replaced by other insulating housings.

[0043] According to other embodiments of the present invention, the flexible connection 7 may adopt other shapes as long as they can be evenly arranged at equal angles.

[0044] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and modifications that may be made without departing from the scope of the present invention.

Claims

1. A sealed pole, characterized in that: It includes an insulating shell and an upper outlet seat, a vacuum interrupter, a conductive clamp, a soft connection, a lower outlet seat and an insulating pull rod arranged inside the insulating shell, wherein the upper outlet seat is fixed and electrically connected to the static contact end of the vacuum interrupter, the moving contact end of the vacuum interrupter is electrically connected to the lower outlet seat through the conductive clamp and the soft connection, one end of the insulating pull rod is fixed to the moving contact end of the vacuum interrupter, and the lower outlet seat is arranged radially outside the conductive clamp, wherein the soft connection includes a plurality of soft connection components, and the plurality of soft connection components are evenly arranged at equal angles between the conductive clamp and the lower outlet seat.

2. The sealed pole according to claim 1, characterized in that: The flexible connection comprises a first flexible connection component, a second flexible connection component, a third flexible connection component and a fourth flexible connection component which are evenly arranged at a 90-degree angle.

3. The sealed pole according to claim 1 or 2, characterized in that: The conductive clip has a first cavity and a second cavity connected to each other, the shape of the first cavity matches the shape of the moving contact end of the vacuum interrupter, and the second cavity matches the shape of the one end portion of the insulating pull rod.

4. The sealed pole according to claim 3, characterized in that: A flange portion is provided at the middle portion of the outer side of the conductive clip.

5. The sealed pole according to claim 4, characterized in that: Each of the multiple soft connection components includes a pair of relatively arranged soft connection members, and the soft connection members include a first arm, a second arm and a bridging arm connecting the first arm and the second arm, and the length of the first arm is smaller than the length of the second arm.

6. The sealed pole according to claim 5, characterized in that: The first arm of one of the pair of oppositely arranged soft connectors is fixed to the outer side wall of the conductive clip above the flange portion, the first arm of the other of the pair of oppositely arranged soft connectors is fixed to the outer side wall of the conductive clip below the flange portion, and the second arm of each of the pair of oppositely arranged soft connectors is fixed to the lower wire outlet seat.

7. The sealed pole according to claim 6, characterized in that: The lower outlet seat has an inner cavity, and the second arm of each flexible connection of the pair of oppositely arranged flexible connectors is fixed to the side wall of the inner cavity of the lower outlet seat.

8. The sealed pole according to claim 1 or 2, characterized in that: The external area of ​​the insulating shell between the upper outlet seat and the lower outlet seat includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along the longitudinal axis, and the size of the first umbrella skirt portion along the direction perpendicular to the longitudinal axis is different from the size of the second umbrella skirt portion along the direction perpendicular to the longitudinal axis.

9. The sealed pole according to claim 1 or 2, characterized in that: The external area of ​​the insulating shell between the lower outlet seat and the bottom plate mounting surface of the sealed pole includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along the longitudinal axis, and the size of the first umbrella skirt portion along the direction perpendicular to the longitudinal axis is different from the size of the second umbrella skirt portion along the direction perpendicular to the longitudinal axis.

10. The sealed pole according to claim 1 or 2, characterized in that: The outer areas of the insulating shell on both sides of the lower outlet seat include ear-shaped umbrella skirt parts.

11. The sealed pole according to claim 1 or 2, characterized in that: The insulating pull rod includes a first umbrella skirt portion and a second umbrella skirt portion alternately arranged along a longitudinal axis, wherein a size of the first umbrella skirt portion in a direction perpendicular to the longitudinal axis is different from a size of the second umbrella skirt portion in the direction perpendicular to the longitudinal axis.

12. The sealed pole according to claim 1 or 2, characterized in that: It also includes a heat dissipation frame, which is fixed to the upper end surface of the upper outlet seat.

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