Moving contact wear condition monitoring structure of universal circuit breaker

Abstract

A structure for monitoring the abrasion condition of a moving contact of a universal circuit breaker comprises the moving contact, the moving contact is installed in a base of the circuit breaker, an operating mechanism of the circuit breaker can drive the moving contact to rotate, and the moving contact can make contact with and be separated from a static contact in the rotating process so as to control the on-off state of a circuit where the circuit breaker is located. The moving contact is provided with an over-travel prompting part and an abrasion warning part, and when the moving contact is in a closing position, the over-travel and abrasion conditions of the moving contact can be judged by observing whether the over-travel prompting part and the abrasion warning part can be seen or not. In the switching-on and switching-off processes of the moving contact and the static contact of the circuit breaker, whether the contact piece of the moving contact reaches or exceeds the over-travel prompting part or not can be observed at the switching-on position of the circuit breaker, and after the contact piece is worn for a certain number of times, the wear condition of the moving contact can be monitored through the wear warning part.

Description

Technical Field

[0001] The utility model belongs to a circuit breaker, and more specifically, it relates to a monitoring structure for the wear condition of the moving contact of an air circuit breaker. Background Technique

[0002] A circuit breaker is an important power distribution device in a low-voltage power distribution system. With the continuous improvement of the requirements of the power system, the performance requirements for circuit protection switches are getting higher and higher. Miniaturization, high performance, modularization, and high reliability are the development directions of circuit breakers at the present stage. The contact system is the core component of the circuit breaker, and the parameters of the contact spring and the final contact pressure in the contact system are directly related to the short-time withstand performance of the circuit breaker.

[0003] The existing moving contact system of an air circuit breaker includes a moving contact piece, a contact spring, a contact support, a clamping plate, and a shaft. The contact spring is located between the installation groove on the contact support and the groove of the moving contact piece; the moving contact of the air circuit breaker is formed by parallel connection of several contact pieces. The contact and separation of the moving contact and the static contact control the on-off of the circuit. After the moving contact has been used for a long time, certain wear will occur and its service life will become shorter. The existing air circuit breaker uses a life counter of the mechanism to judge the service life of the air circuit breaker. However, in fact, the life calculator calculates the conduction times of the moving contact and cannot know the actual wear condition of the moving contact of the product. Summary of the Utility Model

[0004] Aiming at the defect that the actual wear condition of the moving contact cannot be known during the use of the existing air circuit breaker's moving contact, the utility model provides a monitoring structure for the wear condition of the moving contact of an air circuit breaker. During the closing and opening processes of the moving contact and the static contact of the circuit breaker, when the circuit breaker is in the closing position, not only can it be observed whether the contact piece of the moving contact reaches the over-travel line, but after passing the over-travel line, after the contact piece has been worn a certain number of times, the wear condition of the moving contact can be monitored through the wear line.

[0005] Technical Solution

[0006] To achieve the above technical purpose, the utility model provides a monitoring structure for the wear condition of the moving contact of an air circuit breaker, which includes a moving contact. The moving contact is installed in the base of the circuit breaker, and the operating mechanism of the circuit breaker can drive the moving contact to rotate. During the rotation of the moving contact, it can contact and separate from the static contact to control the on-off of the circuit where the circuit breaker is located. The characteristic is that: a wear warning part is arranged on the moving contact. When the moving contact is in the closing position, the wear condition of the moving contact can be judged by observing the relative position change between the wear warning part and the moving contact piece prompting part.

[0007] In one of the embodiments, the wear warning part is a wear warning surface or a wear warning line.

[0008] In one embodiment, an overtravel prompt portion is provided on the moving contact. When the moving contact is in the closing position, the overtravel amount of the moving contact can be judged by observing the relative position change between the overtravel prompt portion and the moving contact piece prompt portion.

[0009] In one embodiment, the overtravel prompt portion is an overtravel prompt surface or an overtravel prompt line.

[0010] In one embodiment, the wear warning portion is provided on the contact support of the moving contact.

[0011] In one embodiment, the overtravel prompt portion and the wear warning portion are provided on a side surface of the contact support of the moving contact away from the moving contact housing;

[0012] The distance between the overtravel prompt portion and the contact spring is farther than the distance between the wear warning portion and the contact spring.

[0013] In one embodiment, the overtravel prompt portion and the wear warning portion are parallel to each other.

[0014] In one embodiment, the wear warning portion is a concave surface with a certain width. When the highest position of the moving contact piece prompt portion is within the width range of the concave surface, it indicates that the overtravel is consumed; or the wear warning portion b is an indication line 1. When the highest position of the moving contact piece prompt portion is flush with the indication line 1, it indicates that the overtravel is consumed.

[0015] In one embodiment, the overtravel prompt portion is a convex surface with a certain width. When the highest position of the moving contact piece prompt portion is within the width range of the convex surface, it indicates that there is overtravel; or the overtravel prompt portion is an indication line 2. When the highest position of the moving contact piece prompt portion is flush with the indication line 2, it indicates that when the new switch is assembled, the overtravel meets the requirements.

[0016] In one embodiment, the moving contact piece prompt portion is an arcing horn.

[0017] Beneficial effects

[0018] The utility model provides a monitoring structure for the wear condition of the moving contact of a universal circuit breaker, which includes a moving contact installed in the base of the circuit breaker. The operating mechanism of the circuit breaker can drive the moving contact to rotate. During the rotation of the moving contact, it can contact and separate from the static contact to control the on-off of the circuit where the circuit breaker is located. An overtravel prompt part and a wear warning part are arranged on the moving contact. When the moving contact is in the closing position, the overtravel and wear conditions of the moving contact can be judged by observing whether the overtravel prompt part and the wear warning part can be seen. During the closing and opening processes of the moving contact and the static contact of the circuit breaker, when the circuit breaker is in the closing position, not only can it be observed whether the contact piece of the moving contact reaches the overtravel prompt line, but after the contact piece has been worn a certain number of times after passing the overtravel line, the wear condition of the moving contact can also be monitored through the wear warning line. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0020] Fig. Figure 1 is a schematic diagram of the moving contact in the closing position in the embodiment of the present utility model.

[0021] Fig. Figure 2a is a schematic diagram of the structure of the moving contact in the overtravel line in the embodiment of the present utility model.

[0022] Fig. Figure 2b is a partially enlarged schematic diagram of the moving contact in the overtravel line in the embodiment of the present utility model.

[0023] Fig. Figure 3a is a schematic diagram of the structure of the moving contact in the wear consumption warning line in the embodiment of the present utility model.

[0024] Fig. Figure 3b is a partially enlarged schematic diagram of the moving contact in the wear consumption warning line in the embodiment of the present utility model.

[0025] Fig. Figure 4a is a schematic diagram of the structure of the moving contact in the embodiment of the present utility model.

[0026] Fig. Figure 4b is Fig. Figure 4a The enlarged view at A in

[0027] Fig. Figure 5 is a top view of the moving contact in the embodiment of the present utility model.

[0028] Fig.Figure 6 This is a schematic diagram of the contact support structure in an embodiment of the present utility model. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present application are only for the purpose of illustration and do not represent the only implementation manner.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0032] In the present application, unless otherwise clearly defined and limited, the first feature may be in direct contact with the second feature "on" or "under" the second feature, or the first feature and the second feature may be in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific implementation manners and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0034] Embodiment

[0035] The existing universal circuit breaker judges the service life of the universal circuit breaker through the life counter of the mechanism. However, in fact, the life calculator calculates the conduction times of the moving contact, and it is impossible to know the actual wear condition of the moving contact of the product. To solve this problem, this embodiment provides a monitoring structure for the wear condition of the moving contact of a universal circuit breaker. As shown in Figures 4 and 5, it includes a moving contact 1. A plurality of moving contact pieces 104 in the moving contact 1 are rotatably installed on a clamping plate 106 through a moving contact piece shaft 105. The contact support 101 and the clamping plate 106 are fixedly installed together. A spring installation groove 101a is provided on the contact support 101. One end of a contact spring 103 is installed in the spring installation groove 101a, and the other end abuts against the inner sides of the plurality of moving contact pieces 104. A moving contact housing 102 is placed outside the plurality of moving contact pieces 104 and fixedly installed together with the contact support 101. As shown in the attached Figure 1 figure, the moving contact 1 is installed in the base 2 of the circuit breaker. The operating mechanism of the circuit breaker can drive the moving contact 1 to rotate. During the rotation of the moving contact 1, it can contact and separate from the static contact to realize the control of the on-off of the circuit where the circuit breaker is located.

[0036] An overtravel prompt part a and a wear warning part b are provided on the moving contact 1. Among them, as shown in the attached Figure 6 figure, the overtravel prompt part a and the wear warning part b are provided on the contact support 101 of the moving contact 1. Further, the overtravel prompt part a and the wear warning part b are provided on a side surface of the contact support 101 of the moving contact 1 away from the moving contact housing 102. The distance between the overtravel prompt part a and the contact spring 103 is farther than the distance between the wear warning line b and the contact spring 103. The overtravel prompt part a and the wear warning part b are parallel to each other. The overtravel prompt part a is an overtravel prompt surface or an overtravel prompt line. When the moving contact 1 is in the closing position, the overtravel amount of the moving contact 1 can be judged by observing the relative position change between the overtravel prompt part a and the prompt part of the moving contact piece 104. The wear warning part b is a wear warning surface or a wear warning line. When the moving contact 1 is in the closing position, the wear condition of the moving contact 1 can be judged by observing the relative position change between the wear warning part b and the prompt part of the moving contact piece 104.

[0037] In this embodiment, the overtravel indication part a is a convex surface with a certain width. When the highest position of the indication part of the moving contact piece 104 is within the width range of the convex surface, it indicates that there is overtravel. The indication part of the moving contact piece 104 can be the arcing angle 104a of the moving contact piece 104 or other related features on the moving contact piece 104. When the highest position of the arcing angle 104a of the moving contact piece 104 is within the width range of the convex surface, it indicates that there is overtravel. When the highest position of the arcing angle 104a is basically flush with the upper edge of the convex surface, it indicates that when the new switch is assembled, the overtravel meets the switch requirements. In addition, the wear warning part b is a groove (i.e., a concave surface) with a certain width. When the highest position of the arcing angle 104a of the moving contact piece 104 is within the width range of the groove, it indicates that the overtravel is basically consumed and a new switch needs to be replaced. The narrower the width of the groove, the higher the indication accuracy.

[0038] In some other embodiments, the wear warning part b can also be an indication line 1. When the highest position of the indication part of the moving contact piece 104 is flush with the indication line 1, it indicates that the overtravel is consumed. The overtravel indication part a can also be an indication line 2. When the highest position of the indication part of the moving contact piece 104 is flush with the indication line 2, it indicates that when the new switch is assembled, the overtravel meets the requirements.

[0039] Of course, in still some other embodiments, it can also be that the overtravel indication line a is a convex surface and the wear warning line b is an indication line; or it can also be that the overtravel indication line a is an indication line and the wear warning line b is a groove. The principle and judgment method are the same as those in the above embodiments.

[0040] The installation process of the moving contact in this embodiment: The contact support 101 is provided with a spring installation groove 101a. After the contact spring 103 is placed in several spring installation grooves 101a and the contact system is assembled, the moving contact 1 is driven by the operating mechanism to open and close. At the closing position, it can be observed whether the contact piece reaches the overtravel indication part a or passes the overtravel indication part a, as shown in the appendix Figure 2a and 2b shown. After a certain number of wear times, the wear condition of the moving contact is monitored through the wear warning part b, as shown in appendix 3a and 3b.

[0041] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0042] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A monitoring structure for the wear condition of the moving contact of a universal circuit breaker, which comprises a moving contact (1). The moving contact (1) is installed in the base (2) of the circuit breaker. The operating mechanism of the circuit breaker can drive the moving contact (1) to rotate. During the rotation of the moving contact (1), it can contact and separate from the static contact to control the on-off of the circuit where the circuit breaker is located. It is characterized in that: A wear warning portion (b) is provided on the moving contact (1). When the moving contact (1) is in the closing position, the wear condition of the moving contact (1) can be judged by observing the relative position change between the wear warning portion (b) and the prompting portion of the moving contact piece (104).

2. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 1, characterized in that: The wear warning portion (b) is a wear warning surface or a wear warning line.

3. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 1, wherein: An over-travel prompting portion (a) is provided on the moving contact (1). When the moving contact (1) is in the closing position, the over-travel amount of the moving contact (1) can be judged by observing the relative position change between the over-travel prompting portion (a) and the prompting portion of the moving contact piece (104).

4. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 3, characterized in that: The over-travel prompting portion (a) is an over-travel prompting surface or an over-travel prompting line.

5. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 1, characterized in that: The wear warning portion (b) is provided on the contact support (101) of the moving contact (1).

6. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 3, wherein: The over-travel prompting portion (a) and the wear warning portion (b) are provided on one side surface of the contact support (101) of the moving contact (1) away from the moving contact housing (102); The distance between the over-travel prompting portion (a) and the contact spring (103) is farther than the distance between the wear warning portion (b) and the contact spring (103).

7. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 3, characterized in that: The over-travel prompting portion (a) and the wear warning portion (b) are parallel to each other.

8. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 2, wherein: The wear warning portion (b) is a concave surface with a certain width. When the highest position of the prompting portion of the moving contact piece (104) is within the width range of the concave surface, it indicates that the over-travel is consumed; Or the wear warning portion (b) is an indicating line 1. When the highest position of the prompting portion of the moving contact piece (104) is flush with the indicating line 1, it indicates that the over-travel is consumed.

9. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 4, characterized in that: The over-travel prompting portion (a) is a convex surface with a certain width. When the highest position of the prompting portion of the moving contact piece (104) is within the width range of the convex surface, it indicates that there is over-travel; Or the over-travel prompting portion (a) is an indicating line 2. When the highest position of the prompting portion of the moving contact piece (104) is flush with the indicating line 2, it indicates that the over-travel meets the requirements when the new switch is assembled.

10. The monitoring structure for the wear condition of the moving contact of a universal circuit breaker according to claim 2, characterized in that: The prompting portion of the moving contact piece (104) is an arcing angle (104a).

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