Electrical insulation structure of molded case circuit breaker
By installing upper and lower insulating parts on the moving contacts of the plastic-shell circuit breaker, the problem of difficulty in meeting the creepage distance and electrical insulation performance of the existing technology is solved, and the safety performance of the circuit breaker is improved.
Patent Information
- Application Number
- CN202421162988.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-05-24
AI Technical Summary
Existing plastic case circuit breakers are difficult to meet the requirements of creepage distance and electrical insulation performance at high voltages.
By installing the upper and lower insulating members on the moving contacts, the creepage distance between the moving contacts of the conductive member and the lower connecting rod metal part of the mechanism member is increased.
It improves the safety performance of the circuit breaker and meets the requirements of creepage distance at high voltage.
Smart Images
Figure CN222637213U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to an electrical insulation structure of a molded case circuit breaker. Background Art
[0002] Circuit breakers are an important part of power distribution equipment. They are mainly used in industrial low-voltage power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. There are many types of circuit breakers, among which molded case circuit breakers are more commonly used. The outer shell uses a plastic insulator to isolate the conductor and the grounded metal part. As the voltage level increases, the creepage distance requirements of molded case circuit breakers also increase. When the insulation voltage increases from 1000V to 1500V, the creepage distance needs to be increased from 16mm to 25mm. However, the structure of existing molded case circuit breakers is difficult to meet the creepage distance requirements under high voltage. Utility Model Content
[0003] The purpose of the utility model is to solve the defect that the existing molded case circuit breaker is difficult to meet the requirements of creepage distance and electrical insulation performance under high voltage. It provides an electrical insulation structure of a molded case circuit breaker, which increases the creepage distance between the conductive moving contact and the lower connecting rod metal part of the mechanism by installing upper and lower insulating parts on the moving contact, thereby improving the safety performance of the circuit breaker.
[0004] Technical Solution
[0005] In order to achieve the above technical objectives, the utility model provides an electrical insulation structure of a molded case circuit breaker, which includes a connecting rod assembly, which can drive a rotating shaft to rotate under the drive of an operating handle assembly, and a moving contact is mounted on the rotating shaft, and is characterized in that: the surface of the moving contact is covered with an insulating part to increase the creepage distance between it and the metal parts of the circuit breaker connecting rod assembly.
[0006] In one of the embodiments, both side surfaces of the moving contact are covered with insulating members.
[0007] In one embodiment, the upper surface of the moving contact is covered with an insulating member.
[0008] In one of the embodiments, there is an overlapping portion between the projections of the moving contact and the lower connecting rod on a plane perpendicular to the axial direction of the rotating shaft, and the corresponding portion of the overlapping portion on the moving contact is covered by an insulating member.
[0009] In one embodiment, the insulating member includes an upper insulating member and a lower insulating member, and the upper insulating member and the lower insulating member are inserted into the moving contact.
[0010] In one embodiment, the upper insulating member and the lower insulating member are mounted on the moving contact by riveting.
[0011] In one of the embodiments, the tail portion 1 of the upper insulating member extends into the area where the rotating shaft is located to cover the tail portion 2 of the moving contact.
[0012] In one of the embodiments, a buckle is further provided at the rear end of the lower insulating member to cooperate with a buckle slot on the moving contact for fixed connection.
[0013] In one embodiment, the lower insulating member includes a moving contact covering portion and a rotating shaft insulating portion, the moving contact covering portion is mounted on the moving contact, and the rotating shaft insulating portion is located at the lower part of the moving contact to prevent the arc from spraying back into the interior of the rotating shaft.
[0014] In one embodiment, the connecting rod assembly includes an upper connecting rod and a lower connecting rod, one end of the lower connecting rod is hinged to one end of the upper connecting rod, and the other end is pivotally connected to the rotating shaft.
[0015] Beneficial Effects
[0016] The utility model provides an electrical insulation structure of a molded case circuit breaker, which includes a connecting rod assembly, wherein the connecting rod assembly can drive a rotating shaft to rotate under the drive of an operating handle assembly, and a moving contact is mounted on the rotating shaft, and is characterized in that the surface of the moving contact is coated with an insulating member to increase the creepage distance between the moving contact and the metal member of the circuit breaker connecting rod assembly. The electrical insulation structure increases the creepage distance between the conductive moving contact and the metal member of the lower connecting rod of the mechanism by installing upper and lower insulating members on the moving contact, thereby improving the safety performance of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0018] Attached Figure 1 It is a schematic diagram of the structure of the contact system and the operating mechanism in the embodiment of the utility model;
[0019] Attached Figure 2a This is a schematic diagram of the assembly of the moving contact and the insulating member in the embodiment of the utility model;
[0020] Attached Figure 2b It is an exploded schematic diagram of the moving contact and the insulating member in the embodiment of the utility model;
[0021] Attached Figure 3It is a three-dimensional schematic diagram of the movable contact linkage structure in the embodiment of the utility model;
[0022] Attached Figure 4 This is a schematic diagram of the moving contact linkage structure in the embodiment of the utility model;
[0023] Attached Figure 5 Yes Figure 4 A-axis sectional view;
[0024] Attached Figure 6 This is a schematic diagram of the structure of the lower insulating member in the embodiment of the utility model;
[0025] Attached Figure 7 This is a schematic diagram of the rotating shaft structure in the embodiment of the utility model; DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.
[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0029] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.
[0031] Example
[0032] The structure of existing molded case circuit breakers is difficult to meet the requirements of creepage distance under high voltage. Figure 1 As shown, this embodiment provides an electrical insulation structure of a molded case circuit breaker, which includes a connecting rod assembly 1, and the connecting rod assembly 1 can drive the rotating shaft 3 to rotate under the drive of the operating handle assembly 2, and the moving contact 4 is installed on the rotating shaft 3. The connecting rod assembly 1 includes an upper connecting rod 1a and a lower connecting rod 1b, one end of the lower connecting rod 1b is hinged to one end of the upper connecting rod 1a, and the other end is pivoted to the rotating shaft 3, the other end of the upper connecting rod 1a is linked to the operating handle assembly 2, and the projections of the moving contact 4 and the lower connecting rod 1b on a plane perpendicular to the axial direction of the rotating shaft 3 have an overlapping part.
[0033] Among them, as attached Figure 1 As shown, the surface of the moving contact 4 is covered with an insulating member 5 to increase the creepage distance between it and the metal part of the circuit breaker connecting rod assembly 1. At least the corresponding part of the overlapping part on the moving contact 4 is covered by the insulating member 5. Figure 1 and 3 , 4, 5, and 7, at least a portion of the area of the rotating shaft 3 corresponding to the moving contact 4 is open.
[0034] In further detail, in this embodiment, as shown in the attached Figure 2a and 2b As shown in FIG. 1 , the two side surfaces of the moving contact 4 are covered with insulating members 5. Further, the upper surface of the moving contact 4 is covered with insulating members 5. Specifically, as shown in FIG. Figure 2a and 2bAs shown, the insulating member 5 includes an upper insulating member 5 a and a lower insulating member 5 b , and the upper insulating member 5 a and the lower insulating member 5 b are inserted into the moving contact 4 .
[0035] The upper insulating member 5a and the lower insulating member 5b are mounted on the moving contact 4 by riveting. As shown in the attached figure, the moving contact 4 is provided with a rivet hole 4a, and the upper insulating member 5a and the lower insulating member 5b are riveted together by rivets 6 after being inserted into each other. The rear end of the lower insulating member 5b is also provided with a buckle 5b03 that can cooperate with the slot 402 on the moving contact for further fixing. Figure 5 As shown, the tail 1 5a01 of the upper insulating member 5a extends into the area where the shaft 3 is located to cover the tail 2 401 of the moving contact 4, which can further isolate the shaft 3 from the moving contact 4 and increase the creepage distance between the moving contact 4 and the lower connecting rod 4b. At the same time, the lower insulating member 5b includes a moving contact covering portion 5b01 and a shaft isolating portion 5b02. The moving contact covering portion 5b01 is mounted on the moving contact 4, and the shaft isolating portion 5b02 is located at the lower part of the moving contact 4 to prevent the arc from spraying back into the shaft 3. Figure 6 As shown, the shaft insulating portion 5b02 is located in the arc corresponding to the shaft 3, which further increases the creepage distance and enhances the electrical insulation performance of the circuit breaker.
[0036] The utility model provides an electrical insulation structure of a molded case circuit breaker. By installing upper and lower insulating parts on a moving contact, the creepage distance between the moving contact of a conductive part and a metal part of a lower connecting rod of a mechanism part is increased, thereby improving the safety performance of the circuit breaker.
[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0038] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.
Claims
1. An electrical insulation structure of a molded case circuit breaker, comprising a connecting rod assembly (1), wherein the connecting rod assembly (1) is driven by an operating handle assembly (2) to drive a rotating shaft (3) to rotate, and a moving contact (4) is mounted on the rotating shaft (3), characterized in that: The surface of the moving contact (4) is covered with an insulating member (5) to increase the creepage distance between the moving contact (4) and the metal member of the circuit breaker connecting rod assembly (1).
2. The electrical insulation structure of a molded case circuit breaker according to claim 1, characterized in that: Both side surfaces of the moving contact (4) are covered with insulating parts (5).
3. The electrical insulation structure of a molded case circuit breaker according to claim 2, characterized in that: The upper surface of the moving contact (4) is covered with an insulating member (5).
4. The electrical insulation structure of a molded case circuit breaker according to claim 1, characterized in that: There is an overlapping portion between the projections of the moving contact (4) and the lower connecting rod (1b) on a plane perpendicular to the axial direction of the rotating shaft (3), and the corresponding portion of the overlapping portion on the moving contact (4) is covered by an insulating member (5).
5. The electrical insulation structure of a molded case circuit breaker according to claim 1, characterized in that: The insulating member (5) comprises an upper insulating member (5a) and a lower insulating member (5b), and the upper insulating member (5a) and the lower insulating member (5b) are inserted into the moving contact (4).
6. The electrical insulation structure of a molded case circuit breaker according to claim 5, characterized in that: The upper insulating part (5a) and the lower insulating part (5b) are mounted on the moving contact (4) by riveting.
7. An electrical insulation structure for a molded case circuit breaker according to claim 5 or 6, characterized in that: The first tail portion (5a01) of the upper insulating member (5a) extends into the area where the rotating shaft (3) is located to cover the second tail portion (401) of the moving contact (4).
8. An electrical insulation structure for a molded case circuit breaker according to claim 5 or 6, characterized in that: The rear end of the lower insulating member (5b) is also provided with a buckle (5b03) which can cooperate with the clamping groove (402) on the moving contact (4) for fixed connection.
9. An electrical insulation structure for a molded case circuit breaker according to claim 5 or 6, characterized in that: The lower insulating member (5b) comprises a moving contact covering portion (5b01) and a rotating shaft isolating portion (5b02); the moving contact covering portion (5b01) is mounted on the moving contact (4); and the rotating shaft isolating portion (5b02) is located at the lower portion of the moving contact (4) and is used to prevent the electric arc from spraying back into the interior of the rotating shaft (3).
10. The electrical insulation structure of a molded case circuit breaker according to claim 1, characterized in that: The connecting rod assembly (1) comprises an upper connecting rod (1a) and a lower connecting rod (1b); one end of the lower connecting rod (1b) is hinged to one end of the upper connecting rod (1a), and the other end is pivotally connected to the rotating shaft (3).