Movable contact structure, arc extinguishing chamber and high voltage switch

Abstract

The utility model relates to high pressure switch field especially relates to movable contact structure and arc extinguishing chamber and high pressure switch. Movable contact structure includes movable contact seat, and movable contact seat includes a assembly cylinder section, and the front end of assembly cylinder section is connected with auxiliary spout through inner thread section, and the inner and outer circumferential surface between auxiliary spout and assembly cylinder section is equipped with still the concave-convex cooperation structure of forcibly radial occlusion together when auxiliary spout is screwed to the spin into tail section on assembly cylinder section, and still install movable arc contact assembly in assembly cylinder section, and movable arc contact assembly extends into auxiliary spout and with the inner circumferential surface of the part of auxiliary spout and assembly cylinder section assembled connection is inlayed, to carry out the location in the direction of its inward, keep the occlusion state of concave-convex cooperation structure. This movable contact structure can keep the occlusion of concave-convex cooperation structure through movable arc contact assembly after assembly is completed, thereby guaranteeing the reliable connection between auxiliary spout and assembly cylinder section.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switches, and in particular to the moving contact structure, arc-extinguishing chamber, and high-voltage switch. Background Technology

[0002] To achieve rapid and effective arc extinguishing during the opening and closing of high-voltage switches, high-voltage switches incorporating sulfur hexafluoride (SF6) or vacuum arc-extinguishing chambers are commonly used for high-voltage disconnection. Chinese invention patent application CN116469726A discloses a self-powered arc-extinguishing chamber and circuit breaker with a flow-guiding structure. During opening, SF6 gas is guided by auxiliary and main nozzles and blown towards the opening position of the moving and stationary arc contacts, thus rapidly extinguishing the arc. However, in this moving contact structure, the auxiliary nozzle is threaded to the piston. Due to the high operating speed and significant impact of the moving contact during opening and closing, the auxiliary nozzle, being only threaded to the piston, is prone to loosening. If the auxiliary nozzle becomes detached, it significantly impacts the normal operation of the entire arc-extinguishing chamber.

[0003] To address this issue, Japanese Patent Publication No. JP08115643A discloses an arc-extinguishing chamber structure. In addition to being threadedly connected to the piston, the auxiliary nozzle also has a convex-concave mating structure with the piston. During the screwing of the auxiliary nozzle onto the piston, the helical driving force forces the convex-concave mating structure on the piston to be forcibly joined together. This convex-concave mating structure thus provides axial restraint between the auxiliary nozzle and the piston, preventing loosening of the threaded connection.

[0004] However, in the scheme disclosed in the above literature, in order to achieve the concave-convex fit between the auxiliary nozzle and the piston, the auxiliary nozzle is made of a material that can undergo a certain degree of deformation. This material is more prone to deformation in the high temperature environment of the circuit breaker. Therefore, under the conditions of higher voltage level, greater impact of circuit breaker opening and higher temperature, the auxiliary nozzle may still loosen. Utility Model Content

[0005] The purpose of this invention is to provide a moving contact structure to solve the problem that the auxiliary nozzle of existing moving contact structures is prone to detachment from the piston, affecting the normal operation of the arc-extinguishing chamber. Simultaneously, this invention also aims to provide an arc-extinguishing chamber to solve the problem that the auxiliary nozzle of existing high-voltage switch arc-extinguishing chambers is prone to detachment from the piston, affecting the normal operation of the arc-extinguishing chamber. Furthermore, this invention also aims to provide a high-voltage switch to solve the problem that the auxiliary nozzle of existing high-voltage switch arc-extinguishing chambers is prone to detachment from the piston, affecting the normal operation of the switch.

[0006] The moving contact structure of this utility model includes a moving contact seat, which includes an assembly cylinder section. The front end of the assembly cylinder section is connected to an auxiliary nozzle through an internal thread section. The inner and outer peripheral surfaces of the auxiliary nozzle and the assembly cylinder section are provided with a concave-convex fit structure that forces them to engage radially when the auxiliary nozzle is screwed onto the assembly cylinder section to the tail section. A moving arc contact assembly is also installed inside the assembly cylinder section. The moving arc contact assembly extends into the auxiliary nozzle and fits against the inner peripheral surface of the part of the auxiliary nozzle that is assembled and connected to the assembly cylinder section, so as to limit it in the inward direction and maintain the engagement state of the concave-convex fit structure.

[0007] Furthermore, the moving arc contact assembly is inserted into the assembly cylinder section from back to front. The assembly cylinder section is provided with an inner convex ring that stops the moving arc contact assembly in the forward direction. The rear end of the assembly cylinder section is threadedly connected to the transmission operating rod. The transmission operating rod is screwed into the assembly cylinder section and presses the moving arc contact assembly onto the inner convex ring.

[0008] Furthermore, the moving arc contact assembly includes a moving arc contact and an arc contact support cylinder. The arc contact support cylinder has a limiting support cylinder section that extends into the moving arc contact to limit the arc contact in the radially inward direction, and an assembly support cylinder section that extends into the transmission operating rod to be inserted and fitted with the transmission operating rod. The arc contact support cylinder has a clamping external protrusion ring that is clamped between the rear end of the moving arc contact and the front end of the transmission operating rod.

[0009] Furthermore, the inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected with the assembly cylinder section is a cylindrical surface so as to fit tightly with the outer circumferential surface of the moving arc contact.

[0010] Furthermore, the portion of the auxiliary nozzle located on the front side of the cylinder has an expanded inner circumferential surface that avoids the moving arc contact.

[0011] Furthermore, the external thread section on the auxiliary nozzle, which is used for threaded connection with the assembly cylinder section, is located on the rear side of the concave-convex fit structure.

[0012] Furthermore, the outer circumferential surface of the auxiliary nozzle near the rear end has a three-step structure with the outer diameter decreasing from front to back. The external thread section of the auxiliary nozzle for connecting with the assembly cylinder section is set on the small diameter section at the rear end, and the concave-convex mating structure is set on the middle diameter section in front of the small diameter section. The radial annular surface between the middle diameter section and the large diameter section in front of it fits against the front end face of the assembly cylinder section.

[0013] Furthermore, the convex-concave fit structure on the auxiliary nozzle is an outer ring convex structure, while the convex-concave fit structure on the assembly cylinder section is an inner ring groove structure.

[0014] This utility model innovatively provides a moving contact structure that changes the existing assembly connection method of moving contact structures. The auxiliary nozzle is threaded to the assembly cylinder section of the moving contact seat and engages with the assembly cylinder section through a concave-convex fit structure. Moreover, after the moving arc contact assembly is assembled and connected to the assembly cylinder section, it can fit against the inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected to the assembly cylinder section, limiting its inward direction. This ensures that the concave-convex fit structure is always in engagement. Thus, when the moving arc contact assembly is inside the assembly cylinder section, the auxiliary nozzle cannot become loose from the assembly cylinder section, ensuring the assembly reliability of the auxiliary nozzle.

[0015] The arc-extinguishing chamber of this utility model includes a moving contact structure and a stationary contact structure. The moving contact structure includes a moving contact seat, which includes an assembly cylinder section. The front end of the assembly cylinder section is connected to an auxiliary nozzle through an internal thread section. The inner and outer peripheral surfaces of the auxiliary nozzle and the assembly cylinder section are provided with a concave-convex fit structure that forces them to engage radially when the auxiliary nozzle is screwed onto the assembly cylinder section until it reaches the tail section. A moving arc contact assembly is also installed inside the assembly cylinder section. The moving arc contact assembly extends into the auxiliary nozzle and fits against the inner peripheral surface of the part of the auxiliary nozzle that is assembled and connected to the assembly cylinder section, so as to limit its inward direction and maintain the engagement state of the concave-convex fit structure.

[0016] Furthermore, the moving arc contact assembly is inserted into the assembly cylinder section from back to front. The assembly cylinder section is provided with an inner convex ring that stops the moving arc contact assembly in the forward direction. The rear end of the assembly cylinder section is threadedly connected to the transmission operating rod. The transmission operating rod is screwed into the assembly cylinder section and presses the moving arc contact assembly onto the inner convex ring.

[0017] Furthermore, the moving arc contact assembly includes a moving arc contact and an arc contact support cylinder. The arc contact support cylinder has a limiting support cylinder section that extends into the moving arc contact to limit the arc contact in the radially inward direction, and an assembly support cylinder section that extends into the transmission operating rod to be inserted and fitted with the transmission operating rod. The arc contact support cylinder has a clamping external protrusion ring that is clamped between the rear end of the moving arc contact and the front end of the transmission operating rod.

[0018] Furthermore, the inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected with the assembly cylinder section is a cylindrical surface so as to fit tightly with the outer circumferential surface of the moving arc contact.

[0019] Furthermore, the portion of the auxiliary nozzle located on the front side of the cylinder has an expanded inner circumferential surface that avoids the moving arc contact.

[0020] Furthermore, the external thread section on the auxiliary nozzle, which is used for threaded connection with the assembly cylinder section, is located on the rear side of the concave-convex fit structure.

[0021] Furthermore, the outer circumferential surface of the auxiliary nozzle near the rear end has a three-step structure with the outer diameter decreasing from front to back. The external thread section of the auxiliary nozzle for connecting with the assembly cylinder section is set on the small diameter section at the rear end, and the concave-convex mating structure is set on the middle diameter section in front of the small diameter section. The radial annular surface between the middle diameter section and the large diameter section in front of it fits against the front end face of the assembly cylinder section.

[0022] Furthermore, the convex-concave fit structure on the auxiliary nozzle is an outer ring convex structure, while the convex-concave fit structure on the assembly cylinder section is an inner ring groove structure.

[0023] This invention improves upon existing arc-extinguishing chambers by employing a novel moving contact structure. This new structure departs from the conventional assembly method, with the auxiliary nozzle threaded onto the assembly cylinder of the moving contact seat. The nozzle engages with the assembly cylinder via a convex-concave fit structure. Furthermore, after the moving arc contact assembly is assembled with the assembly cylinder, it can fit against the inner circumferential surface of the portion of the auxiliary nozzle connected to the assembly cylinder, limiting its inward movement. This ensures the convex-concave fit structure remains engaged, preventing the auxiliary nozzle from detaching from the assembly cylinder when the moving arc contact assembly is within it, thus guaranteeing the reliability of the auxiliary nozzle assembly.

[0024] The high-voltage switch of this utility model includes an operating mechanism and an arc-extinguishing chamber. The arc-extinguishing chamber includes a moving contact structure and a stationary contact structure. The moving contact structure includes a moving contact seat, which includes an assembly cylinder section. The front end of the assembly cylinder section is connected to an auxiliary nozzle through an internal thread section. A concave-convex fit structure is provided between the inner and outer peripheral surfaces of the auxiliary nozzle and the assembly cylinder section, which is forcibly radially engaged when the auxiliary nozzle is screwed onto the assembly cylinder section until it is screwed into the tail section. A moving arc contact assembly is also installed inside the assembly cylinder section. The moving arc contact assembly extends into the auxiliary nozzle and fits against the inner peripheral surface of the part of the auxiliary nozzle that is assembled and connected to the assembly cylinder section, so as to limit its inward direction and maintain the engagement state of the concave-convex fit structure.

[0025] Furthermore, the moving arc contact assembly is inserted into the assembly cylinder section from back to front. The assembly cylinder section is provided with an inner convex ring that stops the moving arc contact assembly in the forward direction. The rear end of the assembly cylinder section is threadedly connected to the transmission operating rod. The transmission operating rod is screwed into the assembly cylinder section and presses the moving arc contact assembly onto the inner convex ring.

[0026] Furthermore, the moving arc contact assembly includes a moving arc contact and an arc contact support cylinder. The arc contact support cylinder has a limiting support cylinder section that extends into the moving arc contact to limit the arc contact in the radially inward direction, and an assembly support cylinder section that extends into the transmission operating rod to be inserted and fitted with the transmission operating rod. The arc contact support cylinder has a clamping external protrusion ring that is clamped between the rear end of the moving arc contact and the front end of the transmission operating rod.

[0027] Furthermore, the inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected with the assembly cylinder section is a cylindrical surface so as to fit tightly with the outer circumferential surface of the moving arc contact.

[0028] Furthermore, the portion of the auxiliary nozzle located on the front side of the cylinder has an expanded inner circumferential surface that avoids the moving arc contact.

[0029] Furthermore, the external thread section on the auxiliary nozzle, which is used for threaded connection with the assembly cylinder section, is located on the rear side of the concave-convex fit structure.

[0030] Furthermore, the outer circumferential surface of the auxiliary nozzle near the rear end has a three-step structure with the outer diameter decreasing from front to back. The external thread section of the auxiliary nozzle for connecting with the assembly cylinder section is set on the small diameter section at the rear end, and the concave-convex mating structure is set on the middle diameter section in front of the small diameter section. The radial annular surface between the middle diameter section and the large diameter section in front of it fits against the front end face of the assembly cylinder section.

[0031] Furthermore, the convex-concave fit structure on the auxiliary nozzle is an outer ring convex structure, while the convex-concave fit structure on the assembly cylinder section is an inner ring groove structure.

[0032] This invention improves upon existing high-voltage switches by employing a novel moving contact structure. It departs from the existing assembly and connection methods of moving contact structures. The auxiliary nozzle is threaded onto the assembly cylinder section of the moving contact seat and engages with the assembly cylinder section via a convex-concave fit structure. Furthermore, after the moving arc contact assembly is assembled with the assembly cylinder section, it can fit against the inner circumferential surface of the part of the auxiliary nozzle that is assembled with the assembly cylinder section, limiting its inward movement. This ensures that the convex-concave fit structure remains engaged, preventing the auxiliary nozzle from detaching from the assembly cylinder section when the moving arc contact assembly is inside, thus guaranteeing the assembly reliability of the auxiliary nozzle. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the moving contact structure in an embodiment of the high-voltage switch of this utility model;

[0034] Figure 2 for Figure 1 A schematic diagram of the assembly structure of the moving contact seat, the moving arc contact, the auxiliary nozzle, and the transmission operating lever;

[0035] Figure 3 This is a schematic diagram of the auxiliary nozzle structure;

[0036] Figure 4 for Figure 2 Right view of the moving contact seat.

[0037] In the diagram: 1. Moving contact seat; 10. Assembly cylinder section; 11. Inner convex ring; 100. Air inlet valve port; 2. Auxiliary nozzle; 20. Air guide hole; 200. Outer expansion inner circumferential surface; 21. Outer convex ring; 22. External thread section; 210. Medium diameter section; 220. Small diameter section; 30. Moving arc contact; 300. Cylindrical surface; 310. Clamping outer convex ring; 311. Assembly support cylinder section; 312. Limiting support cylinder section; 4. Transmission operating rod; 5. Moving main contact seat; 6. Moving main contact; 7. Large nozzle; 71. Assembly outer convex ring. Detailed Implementation

[0038] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0039] This invention improves the moving contact structure in high-voltage switches, providing a novel moving contact structure. The moving arc contact 30 limits the assembly position of the auxiliary nozzle 2 and the moving contact seat 1, keeping the convex-concave fit structure between the auxiliary nozzle 2 and the moving contact seat 1 in a locked state, thus preventing the convex-concave fit structure from disengaging and ultimately improving the assembly reliability between the auxiliary nozzle 2 and the moving contact seat 1.

[0040] Based on the above concept, various embodiments of high-voltage switches are provided below for illustration.

[0041] An embodiment of a basic high-voltage switch, such as Figure 1-4 As shown, the high-voltage switch includes an operating mechanism and an arc-extinguishing chamber. The arc-extinguishing chamber includes a moving contact structure and a stationary contact structure. The moving contact structure is driven by the operating mechanism and is operated by the operating mechanism to open and close the circuit. This invention does not improve the operating mechanism or the stationary contact structure of the arc-extinguishing chamber; the improvement lies in the moving contact structure of the arc-extinguishing chamber. Therefore, the following description focuses on the moving contact structure, and other parts not involved in the improvement will not be described.

[0042] The moving contact structure includes a moving contact seat 1, which is similar to the existing moving contact seat 1 structure. Both include a disc-shaped body, an air inlet 100 on the disc-shaped body, a one-way valve at the air inlet 100, and an assembly cylinder section 10 extending to one side in the middle of the disc-shaped body. Unlike the existing moving contact seat 1, in this embodiment, the front end of the assembly cylinder section 10 is provided with an internal thread section, and an auxiliary nozzle 2 is threadedly connected through this internal thread section. A concave-convex fit structure is also provided between the inner and outer peripheral surfaces of the auxiliary nozzle 2 and the assembly cylinder section 10. The concave-convex fit structure includes a convex ring provided on one of the auxiliary nozzle 2 and the assembly cylinder section 10 and an annular groove provided on the other. During the process of the auxiliary nozzle 2 being screwed onto the internal thread section of the assembly cylinder section 10 through its external thread section 22, when the external thread section 22 and the internal thread section are screwed into the tail section (when they are about to be fully screwed into place), the convex ring and the annular groove are forcibly radially engaged together. The engagement of the two achieves axial mutual fixation between the auxiliary nozzle 2 and the moving contact seat 1, thereby also achieving thread anti-loosening between the auxiliary nozzle 2 and the moving contact seat 1, and improving the stability of the assembly connection between the two.

[0043] An arc-moving contact 30 assembly is also installed inside the assembly cylinder section 10. The arc-moving contact 30 assembly extends into the auxiliary nozzle 2 and abuts against the inner circumferential surface of the part of the auxiliary nozzle 2 that is assembled and connected to the assembly cylinder section 10, thereby limiting its inward movement and maintaining the engagement state of the convex-concave mating structure. In this way, the arc-moving contact 30 assembly provides an additional safety function, preventing the convex-concave mating structure from accidentally disengaging during the opening and closing process when the moving contact structure is subjected to impact and vibration. Compared with the prior art, this further ensures the assembly stability of the auxiliary nozzle 2.

[0044] As can be seen from the above description and analysis, as long as the moving arc contact 30 assembly can radially limit the inner circumferential surface of the part of the auxiliary nozzle 2 that is assembled and connected with the assembly cylinder section 10, the concave-convex mating structure can always be in an engaged state. Therefore, the specific way the moving arc contact 30 assembly is installed in the assembly cylinder section 10 is not fixed. Thus, the assembly form of the moving arc contact 30 assembly and the assembly cylinder section 10 can be different in different embodiments.

[0045] For example, based on the above embodiments, in one embodiment, the moving arc contact 30 assembly mainly includes a moving arc contact 30, which is inserted into the assembly cylinder section 10 from back to front. The assembly cylinder section 10 is provided with an inner convex ring 11 that blocks the moving arc contact 30 assembly in the forward direction. The moving arc contact 30 has an outer convex flange that is opposite to the inner convex ring 11 and mutually blocks and cooperates with it. After the moving arc contact 30 is installed in place, a C-shaped retaining ring is installed in the inner hole of the assembly cylinder section 10 at the position behind the moving arc contact 30 to realize the assembly and fixation of the moving arc contact 30. Alternatively, in one embodiment, the moving arc contact 30 assembly mainly includes a moving arc contact 30, which is inserted into the assembly cylinder section 10 from back to front. The assembly cylinder section 10 is provided with an inner convex ring 11 that blocks the moving arc contact 30 assembly in the forward direction. The moving arc contact 30 has an outer convex flange that is opposite to the inner convex ring 11 and mutually blocks it. The rear end of the assembly cylinder section 10 is threadedly connected to the transmission operating rod 4. When the transmission operating rod 4 is screwed into the assembly cylinder section 10, the moving arc contact 30 assembly is pressed against the inner convex ring 11. Thus, the fixed assembly of the moving arc contact 30 is achieved simultaneously through the fixed assembly between the transmission operating rod 4 and the assembly cylinder section 10.

[0046] The part of the moving arc contact 30 that is inserted and mated with the stationary arc contact is mostly a split structure. That is, the moving arc contact 30 includes a cylindrical section on the rear side and an elastic contact arm structure on the front side of the cylindrical section, which is circumferentially separated by a slot extending from front to back. The elastic contact arm structure itself has a certain radial deformation capacity. Moreover, during the arcing process, the temperature of the moving arc contact 30 is high, making it more prone to deformation. In order to avoid excessive deformation of the moving arc contact 30, in one embodiment, the moving arc contact 30 assembly includes the moving arc contact 30 and the arc contact support cylinder. The arc contact support cylinder has a limiting support cylinder section 312 that extends into the moving arc contact 30 to limit the arc contact in the radially inward direction, and an assembly support cylinder section 311 that extends into the transmission operating rod 4 to be inserted and mated with the transmission operating rod 4. The arc contact support cylinder has a clamping outer protruding ring 310 that is clamped between the rear end of the moving arc contact 30 and the front end of the transmission operating rod 4. The arc contact support cylinder serves two purposes: firstly, it limits the inward movement of the moving arc contact 30; secondly, it provides a certain insertion length with the transmission operating rod 4. The assembly of the support cylinder section 311 also improves the assembly stability with the transmission operating rod 4.

[0047] Based on the above embodiments, in a more preferred embodiment, the inner circumferential surface of the portion of the auxiliary nozzle 2 that is assembled with the assembly cylinder section 10 is a cylindrical surface 300 to tightly fit with the outer circumferential surface of the moving arc contact 30. Thus, when the moving arc contact 30 is installed into the assembly cylinder section 10, it is simultaneously and directly inserted into the auxiliary nozzle 2, achieving engagement and retention at the position of the convex-concave mating structure. Based on this embodiment, in a more preferred embodiment, to avoid excessive friction between the inner wall of the auxiliary nozzle 2 and the moving arc contact 30 when the moving arc contact 30 extends into the auxiliary nozzle 2, which would hinder installation, the portion of the auxiliary nozzle 2 located in front of the cylindrical surface 300 has an outwardly expanded inner circumferential surface 200 that avoids the moving arc contact 30. This allows the moving arc contact 30 to radially limit the portion of the auxiliary nozzle 2 assembled with the assembly cylinder section 10, while also preventing friction between the portion of the auxiliary nozzle 2 that does not require radial limitation by the moving arc contact 30 and the moving arc contact 30.

[0048] Regarding the structure of the auxiliary nozzle 2, its front part can be the same as the existing technology, such as... Figure 3 As shown, the auxiliary nozzle 2 has an air guide hole 20 extending obliquely from the front end face of its outer peripheral surface to increase the amount of air blown towards the inner channel of the large nozzle 7 during the opening process. The rear end of the auxiliary nozzle 2 has an external thread section 22 and a convex-concave mating structure for connecting with the assembly cylinder section 10, with the external thread section 22 and the convex-concave mating structure positioned one in front and the other behind. In one embodiment, the external thread section 22 is located on the front side of the convex-concave mating structure, similar to that in Japanese Patent Document No. JP08115643A. Figure 1 The form shown. In one embodiment of this utility model, as... Figure 1-3 As shown, the external thread section 22 on the auxiliary nozzle 2, which is used for threaded connection with the assembly cylinder section 10, is located on the rear side of the concave-convex fit structure.

[0049] like Figure 3The illustrated embodiment provides a specific structural form. The outer circumferential surface of the auxiliary nozzle 2 near the rear end has a three-step structure with the outer diameter decreasing from front to rear. The external threaded section 22 of the auxiliary nozzle 2, which connects to the assembly cylinder section 10, is located on the small-diameter section 220 at the rear end. The convex-concave mating structure is located on the intermediate-diameter section 210 in front of the small-diameter section 220. The radial annular surface between the intermediate-diameter section 210 and the large-diameter section in front of it fits against the front end face of the assembly cylinder section 10. In this structure, since the convex-concave mating structure is located on the intermediate-diameter section 210, the thickness of the intermediate-diameter section 210 is greater than that of the small-diameter section 220, making it less prone to deformation. Therefore, after the auxiliary nozzle 2 and the assembly cylinder section 10 are assembled, the convex-concave mating structure engages more tightly and is less likely to loosen. As mentioned above, the concave-convex mating structure includes an annular protrusion on one of the auxiliary nozzle 2 and the assembly cylinder section 10, and an annular groove on the other. There is no strict limitation on which of the two—the annular groove and the annular protrusion—is located on the auxiliary nozzle 2 and the assembly cylinder section 10, respectively. In a preferred embodiment of this invention, the concave-convex mating structure on the auxiliary nozzle 2 is an outer annular protrusion, and the concave-convex mating structure on the assembly cylinder section 10 is an inner annular groove. Compared to having the annular protrusion located on the assembly cylinder section 10, this avoids slippage between the annular protrusion and the thread before the auxiliary nozzle 2 enters the assembly cylinder section 10 and is threadedly connected to it.

[0050] Regarding other parts of the moving contact structure, such as Figure 1 As shown, the outer edge of the disc-shaped main body of the moving contact seat 1 is connected to the cylindrical moving main contact seat 5 by connecting screws. The front end of the moving main contact seat 5 is provided with an inward flange, and the inward flange is connected to the annular moving main contact 6 by connecting screws. The moving main contact 6 has a flange that is opposite to the inward flange. The outer surface of the rear end of the large nozzle 7 is provided with an assembly outer protrusion ring 71. When the moving main contact seat 5 and the moving main contact 6 are locked together by connecting screws, the assembly outer protrusion ring 71 is clamped by the inward flange and the flange, thereby realizing the fixed assembly of the large nozzle 7.

[0051] As can be seen from the above description of various embodiments of the present invention, the moving contact structure of the high-voltage switch of the present invention is easy to assemble, and the assembly between the auxiliary nozzle 2 and the moving contact seat 1 is relatively firm, ensuring the reliability of the high-voltage switch.

[0052] The specific structure of the moving contact structure of this utility model is the same as that of the moving contact structure in the high-voltage switch described above, and will not be repeated here.

[0053] The specific structure of the arc-extinguishing chamber embodiment of this utility model is the same as that of the arc-extinguishing chamber described above, and will not be repeated here.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A moving contact structure, characterized in that, The device includes a moving contact seat, which includes an assembly cylinder section. The front end of the assembly cylinder section is connected to an auxiliary nozzle via an internal thread section. The inner and outer circumferential surfaces of the auxiliary nozzle and the assembly cylinder section are provided with a concave-convex fit structure that forces the auxiliary nozzle to engage radially when it is screwed onto the assembly cylinder section to the tail section. A moving arc contact assembly is also installed inside the assembly cylinder section. The moving arc contact assembly extends into the auxiliary nozzle and fits against the inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected to the assembly cylinder section, so as to limit its inward direction and maintain the engagement state of the concave-convex fit structure.

2. The moving contact structure according to claim 1, characterized in that, The moving arc contact assembly is inserted into the assembly cylinder from back to front. The assembly cylinder has an inner convex ring that blocks the moving arc contact assembly in the forward direction. The rear end of the assembly cylinder is threaded to the transmission operating rod. The transmission operating rod is screwed into the assembly cylinder and presses the moving arc contact assembly onto the inner convex ring.

3. The moving contact structure according to claim 2, characterized in that, The moving arc contact assembly includes a moving arc contact and an arc contact support cylinder. The arc contact support cylinder has a limiting support cylinder section that extends into the moving arc contact to limit the arc contact in the radially inward direction, and an assembly support cylinder section that extends into the transmission operating rod to be inserted and fitted with the transmission operating rod. The arc contact support cylinder has a clamping external protrusion ring that is clamped between the rear end of the moving arc contact and the front end of the transmission operating rod.

4. The moving contact structure according to claim 1, characterized in that, The inner circumferential surface of the part of the auxiliary nozzle that is assembled and connected with the assembly cylinder section is cylindrical so as to fit tightly with the outer circumferential surface of the moving arc contact.

5. The moving contact structure according to claim 4, characterized in that, The portion of the auxiliary nozzle located on the front side of the cylinder has an expanded inner circumferential surface that avoids the moving arc contact.

6. The moving contact structure according to any one of claims 1-5, characterized in that, The external thread section on the auxiliary nozzle, which is used for threaded connection with the assembly cylinder section, is located on the rear side of the concave-convex fit structure.

7. The moving contact structure according to claim 6, characterized in that, The outer circumferential surface of the auxiliary nozzle near the rear end has a three-step structure with the outer diameter decreasing from front to back. The external thread section of the auxiliary nozzle for connecting with the assembly cylinder section is set on the small diameter section at the rear end. The concave-convex mating structure is set on the middle diameter section in front of the small diameter section. The radial annular surface between the middle diameter section and the large diameter section in front of it fits against the front end face of the assembly cylinder section.

8. The moving contact structure according to claim 7, characterized in that, The auxiliary nozzle has an outer ring protrusion for its convex-concave fit, while the assembly cylinder section has an inner ring groove for its convex-concave fit.

9. An arc-extinguishing chamber, comprising a moving contact structure and a stationary contact structure, characterized in that, The moving contact structure is the moving contact structure as described in any one of claims 1-8.

10. A high-voltage switch, comprising an operating mechanism and an arc-extinguishing chamber, wherein the arc-extinguishing chamber comprises a moving contact structure and a stationary contact structure, characterized in that, The moving contact structure is the moving contact structure as described in any one of claims 1-8.

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