Contact seat, arc extinguish chamber and circuit breaker

Abstract

The invention provides a contact seat, an arc extinguishing chamber and a circuit breaker, and belongs to the field of arc extinguishing switch devices. The contact seat comprises a seat body, one axial end of the seat body is a connecting end used for being connected with a rod-shaped insulating part, the end wall of the connecting end is provided with at least two mounting positions which are used for being connected with the rod-shaped insulating part and are distributed along the circumferential direction of the seat body, the end wall of the connecting end is connected with a shielding bulge, and the shielding bulge is located in an interval space between two adjacent mounting positions in the circumferential direction. The arc extinguish chamber comprises the contact seat. The circuit breaker comprises the arc extinguish chamber. According to the contact base, the shielding protrusions are arranged at the connecting ends to meet the shielding requirement, meanwhile, the shielding protrusions are arranged in the interval space in the circumferential direction of the installation position, and therefore the radial space, occupied by the shielding protrusions, in the arc extinguish chamber is reduced, and miniaturization of the circuit breaker is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of arc-extinguishing switch devices, and in particular relates to a contact base, an arc-extinguishing chamber, and a circuit breaker. Background Technology

[0002] Circuit breakers using SF6 as the insulating medium are the most widely used switching equipment in high-voltage, ultra-high-voltage, and extra-high-voltage power systems. In the arc-extinguishing chamber of a circuit breaker, an insulating component is installed between the moving contact base and the stationary contact base to connect and support them. This insulating component generally comes in two forms: cylindrical and rod-shaped.

[0003] The cylindrical insulating component is fixedly connected to the moving contact seat and the stationary contact seat at both ends along its axial direction. The cylindrical insulating component completely surrounds the space between the moving contact seat and the stationary contact seat, making it impossible for the operator to observe the opening and closing status of the arc-extinguishing chamber. In addition, it also hinders the flow of insulating gas in the arc-extinguishing chamber.

[0004] The structure of rod-shaped insulator 6 is shown in Appendix 6. Figure 1 and attached Figure 2 The two ends of the rod-shaped insulating member 6 along its length are fixedly connected to the moving contact seat 1 and the stationary contact seat 2 respectively by bolts. An insert that mates with the bolt is cast at the end of the rod-shaped insulating member 6. Both the moving contact seat 1 and the stationary contact seat 2 are provided with mounting holes for the bolts to pass through. A set of mounting holes corresponds to one rod-shaped insulating member 6, thus forming a mounting position. Multiple rod-shaped insulating members 6 are generally used in combination and are evenly distributed along the circumference of the moving contact seat 1 and the stationary contact seat 2, thereby creating a space between the rod-shaped insulating members 6 for observation and the flow of insulating gas. To meet the electric field requirements between the moving and stationary contacts and prevent discharge accidents, annular shields 7 are generally provided on the moving contact seat 1 and the stationary contact seat 2, with the rod-shaped insulating member 6 located inside the shield 7.

[0005] However, the shielding cover occupies a large space, preventing the radial dimension of the arc-extinguishing chamber from being reduced, and consequently, the overall size of the circuit breaker cannot be reduced, which does not meet the requirements for miniaturization of high-voltage circuit breakers. In addition, the shielding cover also leads to a larger number of product parts and higher costs. Summary of the Invention

[0006] One of the objectives of this invention is to provide a contact seat that solves the technical problem in the prior art where the annular shielding cover for the rod-shaped insulating member on the moving contact seat and the stationary contact seat occupies a large space, thus preventing the arc-extinguishing chamber from being reduced in size.

[0007] One of the objectives of this invention is to provide an arc-extinguishing chamber to solve the aforementioned technical problems;

[0008] One of the objectives of this invention is to provide a circuit breaker to solve the aforementioned technical problems.

[0009] To achieve the above objectives, the technical solution for the contact seat provided by the present invention is as follows:

[0010] A contact seat includes a seat body, one axial end of which is a connecting end for connecting a rod-shaped insulating member. At least two mounting positions for connecting the rod-shaped insulating member and distributed circumferentially along the seat body are provided on the end wall of the connecting end. A shielding protrusion is connected to the end wall of the connecting end, and the shielding protrusion is located in the space between two adjacent mounting positions in the circumferential direction.

[0011] As a further improvement, the shielding protrusions and each mounting position are located on the same distribution circle.

[0012] As a further improvement, the shielding protrusion has an arc-shaped structure, and the center of curvature of the shielding protrusion is located on the axis of the base.

[0013] As a further improvement, the outer peripheral wall of the shielding protrusion is aligned with the outer peripheral wall of the connection end.

[0014] As a further improvement, the shielding protrusions and mounting positions are arranged alternately along the circumference.

[0015] As a further improvement, the circumferential length of the shielding protrusion is greater than or equal to the circumferential length of the mounting position.

[0016] As a further improvement, the shielding protrusion is integrally molded with the connection end.

[0017] As a further improvement, the shielding protrusion is detachably connected to the connection end.

[0018] The beneficial effects are as follows: The contact seat provided by this invention is an improvement on the prior art. This contact seat meets the shielding requirements by setting a shielding protrusion on the connection end, and at the same time, the shielding protrusion is set in the circumferential interval space of the mounting position, thereby reducing the radial space occupied by the shielding protrusion in the arc-extinguishing chamber, which in turn can reduce the radial dimension of the arc-extinguishing chamber shell, and ultimately reduce the overall size of the circuit breaker, thus meeting the miniaturization requirements when the circuit breaker is used.

[0019] To achieve the above objectives, the technical solution for the arc-extinguishing chamber provided by this invention is as follows:

[0020] An arc-extinguishing chamber includes a housing and a moving contact seat and a stationary contact seat installed within the housing. A rod-shaped insulating member is disposed between the moving contact seat and the stationary contact seat. At least one of the moving contact seat and the stationary contact seat includes a base body. One axial end of the base body is a connecting end for connecting the rod-shaped insulating member. At least two mounting positions for connecting the rod-shaped insulating member and distributed circumferentially along the base body are provided on the end wall of the connecting end. A shielding protrusion is connected to the end wall of the connecting end, and the shielding protrusion is located in the circumferential spacing space of the mounting positions.

[0021] As a further improvement, the shielding protrusions and mounting positions are located on the same distribution circle.

[0022] As a further improvement, the shielding protrusion has an arc-shaped structure, and the center of curvature of the shielding protrusion is located on the axis of the base.

[0023] As a further improvement, the outer peripheral wall of the shielding protrusion is aligned with the outer peripheral wall of the connection end.

[0024] As a further improvement, the shielding protrusions and mounting positions are arranged alternately along the circumference.

[0025] As a further improvement, the circumferential length of the shielding protrusion is greater than or equal to the circumferential length of the mounting position.

[0026] As a further improvement, the shielding protrusion is integrally molded with the connection end.

[0027] As a further improvement, the shielding protrusion is detachably connected to the connection end.

[0028] The beneficial effects are as follows: The arc-extinguishing chamber provided by this invention is an improvement on the prior art. The contact seat in this arc-extinguishing chamber meets shielding requirements by providing shielding protrusions on the connection end. Simultaneously, the shielding protrusions are positioned within the circumferential spacing of the mounting position, thereby reducing the radial space occupied by the shielding protrusions within the arc-extinguishing chamber. This allows for a reduction in the radial dimension of the arc-extinguishing chamber shell, ultimately leading to a reduction in the overall size of the circuit breaker, thus meeting the miniaturization requirements of circuit breaker use.

[0029] To achieve the above objectives, the technical solution for the circuit breaker provided by this invention is as follows:

[0030] A circuit breaker includes an arc-extinguishing chamber, which includes a housing and a moving contact seat and a stationary contact seat installed within the housing. A rod-shaped insulating member is disposed between the moving contact seat and the stationary contact seat. At least one of the moving contact seat and the stationary contact seat includes a base body. One axial end of the base body is a connecting end for connecting the rod-shaped insulating member. At least two mounting positions for connecting the rod-shaped insulating member and distributed circumferentially along the base body are provided on the end wall of the connecting end. A shielding protrusion is connected to the end wall of the connecting end, and the shielding protrusion is located in the circumferential spacing space of the mounting positions.

[0031] As a further improvement, the shielding protrusions and mounting positions are located on the same distribution circle.

[0032] As a further improvement, the shielding protrusion has an arc-shaped structure, and the center of curvature of the shielding protrusion is located on the axis of the base.

[0033] As a further improvement, the outer peripheral wall of the shielding protrusion is aligned with the outer peripheral wall of the connection end.

[0034] As a further improvement, the shielding protrusions and mounting positions are arranged alternately along the circumference.

[0035] As a further improvement, the circumferential length of the shielding protrusion is greater than or equal to the circumferential length of the mounting position.

[0036] As a further improvement, the shielding protrusion is integrally molded with the connection end.

[0037] As a further improvement, the shielding protrusion is detachably connected to the connection end.

[0038] The beneficial effects are as follows: The circuit breaker provided by this invention is an improvement on the prior art. The contact seat in this circuit breaker meets the shielding requirements by setting a shielding protrusion on the connection end. At the same time, the shielding protrusion is set in the circumferential interval space of the mounting position, thereby reducing the radial space occupied by the shielding protrusion in the arc-extinguishing chamber. This allows the radial dimension of the arc-extinguishing chamber shell to be reduced, and ultimately the overall size of the circuit breaker can be reduced, meeting the miniaturization requirements when using the circuit breaker. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an existing stationary contact seat in the background art of this invention;

[0040] Figure 2 This is a cross-sectional view of the existing stationary contact seat and moving contact seat in the background art of this invention;

[0041] Figure 3 This is a schematic diagram of the structure of the stationary contact seat in one embodiment of the circuit breaker of the present invention;

[0042] Figure 4 for Figure 3 Sectional view along line AA;

[0043] Figure 5 This is a cross-sectional view of the stationary contact seat in one embodiment of the circuit breaker of the present invention;

[0044] Figure 6 This is a schematic diagram of the end structure of the stationary contact seat in one embodiment of the circuit breaker of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Moving contact seat; 11. Moving contact seat body; 12. Moving contact connection end; 13. Moving contact shielding protrusion; 2. Stationary contact seat; 21. Stationary contact seat body; 22. Stationary contact connection end; 23. Stationary contact shielding protrusion; 3. Moving arc contact; 4. Stationary arc contact; 5. Mounting hole; 6. Rod-shaped insulating component; 7. Shielding cover. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the embodiments.

[0048] To address the technical problems in the prior art, the basic concept of this invention is to provide shielding protrusions on the connection end of the contact seat to meet shielding requirements. At the same time, the shielding protrusions are placed in the circumferential interval space of the mounting position, thereby reducing the radial space occupied by the shielding protrusions in the arc-extinguishing chamber, so as to achieve miniaturization of the circuit breaker.

[0049] Specific embodiments of the circuit breaker provided by this invention:

[0050] A circuit breaker includes a circuit breaker housing, an operating mechanism, and an arc-extinguishing chamber.

[0051] The arc-extinguishing chamber includes the arc-extinguishing chamber shell; see appendix. Figure 3 and attached Figure 4 The arc-extinguishing chamber shell is equipped with a moving contact seat 1, a stationary contact seat 2, a moving arc contact 3, a stationary arc contact 4, and a rod-shaped insulating component 6.

[0052] See appendix Figure 5 and attached Figure 6 The stationary contact seat 2 includes a stationary contact seat body 21 and a stationary contact connecting end 22 integrally disposed at one axial end of the stationary contact seat body 21 near the moving contact seat 1. The stationary contact connecting end 22 is an annular structure that protrudes radially from the stationary contact seat body 21. Four mounting positions for connecting rod-shaped insulating members 6 are provided on the axial end wall of the stationary contact connecting end 22. Each mounting position has two mounting holes 5 that penetrate the stationary contact connecting end 22 axially, and each mounting position corresponds to a rod-shaped insulating member 6. In other embodiments, the number of mounting holes 5 in each mounting position can be one, three, or four.

[0053] Four stationary contact shielding protrusions 23 are also connected to the stationary contact connection end 22. These protrusions are located on the end wall of the stationary contact connection end 22 facing the moving contact seat 1 and are integrally cast with the stationary contact connection end 22. The four stationary contact shielding protrusions 23 and four mounting positions are arranged alternately circumferentially. After connecting the rod-shaped insulating member 6 to the stationary contact connection end 22, see Appendix. Figure 3 Four stationary contact shielding protrusions 23 and four rod-shaped insulating elements 6 are arranged alternately. In use, the stationary contact shielding protrusions 23 provide shielding. Furthermore, after the stationary contact shielding protrusions 23 are positioned within the mounting space, see the attached diagram. Figure 4 The radial space occupied by the stationary contact shielding protrusion 23 is relatively small, so the radial dimension of the arc-extinguishing chamber housing can be reduced, thereby reducing the overall size of the circuit breaker and meeting the miniaturization requirements during use.

[0054] The stationary contact shielding protrusion 23 has an arc-shaped structure. Its side wall facing the stationary contact base 21 is the inner side wall, and its side wall away from the stationary contact base 21, i.e., its outer peripheral wall, is the outer side wall. Both the inner and outer side walls are arc surfaces, and their centers of curvature are located on the axis of the stationary contact base 21. Designing the stationary contact shielding protrusion 23 as an arc structure ensures a more uniform distance from the axis of the stationary contact base 21, guaranteeing a better shielding effect. Aligning the outer side wall of the stationary contact shielding protrusion 23 with the outer peripheral wall of the stationary contact connection end 22 ensures a smaller radial dimension of the stationary contact base 21, facilitating the miniaturization of the arc-extinguishing chamber shell.

[0055] The stationary contact shielding protrusion 23 and the mounting position are located on the same distribution circle. Specifically, the arc surface containing the axis of each mounting hole 5 passes through the stationary contact shielding protrusion 23. This arc surface can be located at the radial center of the stationary contact shielding protrusion 23 or off-center. Setting the stationary contact shielding protrusion 23 and the mounting position on the same distribution circle, that is, the stationary contact shielding protrusion 23 and the rod-shaped insulating member 6 are located on the same distribution circle, can ensure that the stationary contact shielding protrusion 23 and the rod-shaped insulating member 6 are roughly aligned in the radial direction. This allows the overall structure composed of the stationary contact shielding protrusion 23 and the rod-shaped insulating member 6 to have a smaller radial dimension, which is beneficial for the miniaturization of the arc-extinguishing chamber shell.

[0056] To improve the shielding effect of the stationary contact shielding protrusion 23, the circumferential length of the stationary contact shielding protrusion 23 can be made greater than or equal to the circumferential length of the mounting position, provided that the rod-shaped insulating member 6 has sufficient strength. In other words, the circumferential length of the stationary contact shielding protrusion 23 is greater than or equal to the circumferential length of the rod-shaped insulating member 6.

[0057] The moving contact base 1 includes a moving contact base body 11, a moving contact connection end 12, and a moving contact shielding protrusion 13. The moving contact connection end 12 also has a mounting position. The moving contact shielding protrusion 13 is configured in the same way as the stationary contact shielding protrusion 23, and will not be described in detail here. In other embodiments, the moving contact shielding protrusion 13 can be provided on the moving contact connection end 12 according to usage requirements. Alternatively, after providing the moving contact shielding protrusion 13 on the moving contact connection end 12, the stationary contact shielding protrusion 23 can be provided on the stationary contact connection end 22 according to usage requirements.

[0058] In the above embodiments, the stationary contact shielding protrusion and the stationary contact connection end are integrally cast, which reduces the number of parts in the circuit breaker and eliminates the need for separate shielding cover processing, thus reducing manufacturing costs. However, in other embodiments, the stationary contact shielding protrusion and the stationary contact connection end can also be manufactured separately and detachably connected. Specifically, threaded holes can be machined on the stationary contact shielding protrusion, and bolt holes can be drilled through the stationary contact connection end. After the bolt passes through the bolt hole and connects with the threaded hole, the stationary contact shielding protrusion can be fixed to the stationary contact connection end. Alternatively, a stud can be fixed on the stationary contact shielding protrusion, and a through hole can be drilled through the stationary contact connection end. Then, the stud is passed through the through hole, and a nut is installed on the stud to fix the stationary contact shielding protrusion and the stationary contact connection end in place. After the stationary contact shielding protrusion and the stationary contact connection end are detachably connected, it can be determined whether the stationary contact shielding protrusion needs to be installed in different application scenarios, or different shapes and sizes of stationary contact shielding protrusions can be installed according to different application requirements, providing high flexibility. Similarly, the moving contact shielding protrusion can also be detachably connected to the moving contact connection end, which will not be elaborated here.

[0059] In the above embodiments, the stationary contact shielding protrusions and the mounting position are arranged alternately along the circumference to make the arrangement of the stationary contact shielding protrusions and the rod-shaped insulating members more uniform, ensuring a better support effect for the rod-shaped insulating members and a better shielding effect for the stationary contact shielding protrusions. In other embodiments, the arrangement of the stationary contact shielding protrusions and the rod-shaped insulating members can be adjusted according to actual needs. For example, two stationary contact shielding protrusions can be arranged as a group and alternately with the rod-shaped insulating members, or two rod-shaped insulating members can be arranged as a group and alternately with the stationary contact shielding protrusions. By simply placing the stationary contact shielding protrusions within the circumferential spacing of the mounting position, the space occupied by the shielding protrusions in the radial direction can be reduced, thereby reducing the size of the arc-extinguishing chamber shell. Similarly, the moving contact shielding protrusions can also be arranged in the above manner, which will not be elaborated here.

[0060] In the above embodiments, aligning the outer peripheral wall of the stationary contact shielding protrusion with the outer peripheral wall of the stationary contact connection end ensures a smaller radial dimension of the stationary contact connection end. In embodiments where the stationary contact shielding protrusion and the stationary contact connection end are detachably connected, since the radial thickness of the stationary contact shielding protrusion may differ, the outer peripheral wall of the stationary contact connection end can protrude beyond the outer peripheral wall of the stationary contact shielding protrusion to ensure the stability of the stationary contact shielding protrusion after installation.

[0061] Specific embodiments of the arc-extinguishing chamber provided by the present invention:

[0062] The arc-extinguishing chamber is the same as the arc-extinguishing chamber in the embodiment of the circuit breaker described above, and will not be described in detail here.

[0063] Specific embodiment 1 of the contact seat provided by the present invention:

[0064] The contact seat is a stationary contact seat, which is the same as the stationary contact seat in the above-mentioned circuit breaker embodiment, and will not be described in detail here.

[0065] Specific embodiment 2 of the contact seat provided by the present invention:

[0066] The contact seat is a moving contact seat, which is the moving contact seat in the above-mentioned circuit breaker embodiment, and will not be described in detail here.

[0067] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A contact seat, comprising a seat body, one axial end of the seat body being a connecting end for connecting a rod-shaped insulating member, the end wall of the connecting end being provided with at least two mounting positions for connecting the rod-shaped insulating member and distributed circumferentially along the seat body, characterized in that, A shielding protrusion is connected to the end wall of the connection end, and the shielding protrusion is located in the space between two adjacent mounting positions in the circumferential direction.

2. The contact seat according to claim 1, characterized in that, The shielding protrusions and each mounting position are located on the same distribution circle.

3. The contact seat according to claim 1 or 2, characterized in that, The shielding protrusion has an arc-shaped structure, and the center of curvature of the shielding protrusion is located on the axis of the base.

4. The contact seat according to claim 3, characterized in that, The outer peripheral wall of the shielding protrusion is aligned with the outer peripheral wall of the connection end.

5. The contact seat according to claim 1 or 2, characterized in that, The shielding protrusions and mounting positions are arranged alternately along the circumference.

6. The contact seat according to claim 1 or 2, characterized in that, The circumferential length of the shielding protrusion is greater than or equal to the circumferential length of the mounting position.

7. The contact seat according to claim 1 or 2, characterized in that, The shielding protrusion and the connection end are integrally molded.

8. The contact seat according to claim 1 or 2, characterized in that, The shielding protrusion is detachably connected to the connecting end.

9. An arc-extinguishing chamber, comprising a housing and a moving contact seat and a stationary contact seat installed within the housing, wherein a rod-shaped insulating member is disposed between the moving contact seat and the stationary contact seat, characterized in that, At least one of the moving contact seat and the stationary contact seat is the contact seat as described in any one of claims 1-8.

10. A circuit breaker comprising an arc-extinguishing chamber, characterized in that, The arc-extinguishing chamber is the arc-extinguishing chamber as described in claim 9.

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