Connecting structure of moving contact of circuit breaker
By setting up a boss at the tail of the moving contact of the circuit breaker and connecting it with multiple flat flexible conductors, the problems of limited connection temperature rise control effect and low motion reliability of the moving contact in the prior art are solved, and a more efficient current collection is achieved The skin and heat dissipation effect extends the service life of the circuit breaker.
Patent Information
- Application Number
- CN202323615217.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2033-12-28
AI Technical Summary
The temperature rise control effect of the connection between the moving contacts of the existing circuit breaker and the soft conductor is limited, and the welding position is easily disturbed by the contact movement, reducing its reliability.
A connecting structure for the moving contacts of the circuit breaker is designed, using multiple flat flexible conductors as the connecting conductors, and a boss is set at the tail of the moving contact to increase the welding area to ensure that the rotation direction of the moving contact is consistent with the stress direction after welding. Reduce temperature rise in welding position.
It effectively improves the rotation reliability and current-carrying area of the moving contacts, reduces the temperature rise in the welding position, and extends the service life of the circuit breaker.
Smart Images
Figure CN222320147U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of circuit breakers, and specifically relates to a connection structure of a moving contact of a circuit breaker. Background Art
[0002] Circuit breakers are an important part of power distribution equipment, 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. When a fault current appears in the circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism is activated to quickly disconnect the moving and static contacts of the circuit breaker. At this time, the voltage between the moving and static contacts causes the air medium to discharge, thereby generating a high-temperature arc. The arc will burn the contacts and affect the connection effect of the contacts. Therefore, transferring the arc from the contacts as soon as possible and extinguishing the arc quickly can effectively reduce the contact burnout, thereby achieving the purpose of increasing the life of the circuit breaker. In the prior art, the moving contact of the circuit breaker carries current when it is closed, and the moving contact needs to move quickly to open and disconnect the current when it is disconnected. While the circuit breaker carries the normal rated current, its own internal resistance will also increase, which intensifies the heating of the circuit breaker itself and increases its temperature rise. Therefore, the welding connection between the moving contact welding part and the flat flexible connecting conductor is particularly important. The traditional moving contact welding part and the flat flexible connection conductor are suitable for the soft connection wire. The soft connection is welded vertically on both sides of the moving contact, which has limited effect on the temperature rise control of the connection part. At the same time, the setting of the welding part is easy to interfere with the movement of the moving contact, reducing the reliability of the moving contact movement. Utility Model Content
[0003] The purpose of the utility model is to provide a connection structure for a moving contact of a circuit breaker, in which the connection conductor is connected by a flat flexible conductor, the tail of the moving contact is adapted to the fusion welding area of the flat flexible connection, the rotation direction of the moving contact is consistent with the stress direction after welding, so that the rotation direction of the moving contact is not hindered by the stress after welding. At the same time, sufficient current-carrying area is ensured to effectively reduce the temperature rise of the welding position.
[0004] Technical Solution
[0005] In order to achieve the above technical purpose, the utility model provides a connection structure of a moving contact of a circuit breaker, which includes a moving contact body, characterized in that: at least one side of the tail of the moving contact body is provided with a boss extending outward for connecting with a connecting conductor, the connecting conductor is formed by stacking a plurality of flat flexible conductors, one end of the connecting conductor is connected to the tail of the moving contact body, and the other end is connected to a conductive bar. The boss structure increases the welding area between the moving contact and the flexible connection, and can achieve a one-time welding connection.
[0006] In one embodiment, the two connecting ends of the flexible conductor are hardened structures.
[0007] In one of the embodiments, there is a through groove along the length direction between the hardened structures at both ends.
[0008] In one embodiment, a through hole is provided at the other end of the connecting conductor to connect with the conductive bar.
[0009] In one embodiment, the boss is located at the rear side of the rotation center O of the moving contact.
[0010] In one embodiment, the flexible conductor is a plurality of copper foils with a thickness of 0.01 mm to 0.08 mm. The flexible connection composed of the copper foil has the largest surface area of the flexible conductor under the condition of the same current carrying capacity, so as to maximize the current skin effect and heat dissipation area.
[0011] In one of the embodiments, the boss is located on the upper part of the moving contact body, and the lower surface of the flat portion at one end of the connecting conductor is connected to the upper surface of the boss.
[0012] In one embodiment, the upper surface of the boss is flush with the upper surface of the moving contact body.
[0013] In one of the embodiments, the boss is located at the lower part of the moving contact body, and the upper surface of the flat portion at one end of the connecting conductor is connected to the lower surface of the boss.
[0014] In one embodiment, the lower surface of the boss is flush with the lower surface of the moving contact body.
[0015] Beneficial Effects
[0016] The utility model provides a connection structure of a moving contact of a circuit breaker, which comprises a moving contact body, wherein at least one side of the tail of the moving contact body is provided with a boss extending outward for connecting with a connecting conductor, wherein the connecting conductor is formed by stacking a plurality of flat flexible conductors, wherein one end of the connecting conductor is connected with the tail of the moving contact body, and the other end is connected with a conductive bar. The connecting conductor is connected using a flat flexible conductor, and the tail of the moving contact is adapted to the fusion welding area of the flat flexible connection, and the rotation direction of the moving contact is consistent with the stress direction after welding so that the rotation direction of the moving contact is not hindered by the stress after welding. At the same time, sufficient current-carrying area is ensured to effectively reduce the temperature rise of the welding position. 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 structural schematic diagram of the moving contact body in Example 1 of the utility model.
[0019] Attached Figure 2 It is a schematic diagram of the connection structure of the connecting conductor in Example 1 of the utility model.
[0020] Attached Figure 3 It is a schematic diagram of the connection between the moving contact body and the connecting conductor in Example 1 of the utility model.
[0021] Attached Figure 4 It is a structural schematic diagram of embodiment 1 of the utility model. DETAILED DESCRIPTION
[0022] 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.
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] Example
[0028] When the circuit breaker is carrying the normal rated current, its own internal resistance will also increase, which will increase the heating of the circuit breaker itself and increase its temperature rise. When the current-carrying cross-sectional area of the circuit breaker conductor is constant, the variable area of the conductive circuit is increased to the maximum extent, so that the skin effect and heat dissipation coefficient can be utilized and play a role to the maximum extent, and finally the heating of the circuit breaker is within the ideal range. When the circuit breaker is working under the fault current, the moving contact needs to rotate quickly to cut off the fault current. At this time, the welding part cannot be hindered by the stress in the rotation direction, which affects the breaking time of the circuit breaker. Based on the above technical purpose, as shown in the attached Figure 4 As shown, this embodiment provides a connection structure of a moving contact of a circuit breaker, which includes the following Figure 1 The moving contact body 1 shown in the figure, wherein at least one side of the tail of the moving contact body 1 is provided with a boss 1a extending outwards for connecting with the connecting conductor 2, as shown in the attached Figure 2 As shown, the connecting conductor 2 is formed by stacking multiple flat flexible conductors. Figure 3 As shown, one end of the connecting conductor 2 is connected to the tail end of the moving contact body 1, and the other end is connected to the conductive bar. In this embodiment, the boss 1a is located behind the moving contact rotation center O. The boss structure increases the area of the moving contact and the flexible connection welding surface m, which can achieve a one-time welding connection.
[0029] As attached Figure 2 As shown, the flexible conductor is a plurality of copper foils with a thickness of 0.01 mm to 0.08 mm. The two ends of the flexible conductor are hardened surfaces n. There is a through groove 2b along the length direction between the two hardened structures, and the through groove makes the copper foil softer.
[0030] The flexible connection composed of copper foil has the largest surface area of flexible conductor under the condition of the same current carrying capacity, which maximizes the current skin effect and heat dissipation area. Figure 4 As shown, one end of the connecting conductor 2 is connected to the tail end of the moving contact body 1, and the other end is provided with a through hole 2a to connect with the conductive bar 3. In this embodiment, one end of the connecting conductor 2 is welded to the tail end of the moving contact body 1, and the connecting conductor is connected using a flat flexible conductor. The tail of the moving contact is adapted to the fusion welding area of the flat flexible connection, that is, the boss 1a is located on the upper part of the moving contact body 1, and the upper surface of the boss 1a is flush with the upper surface of the moving contact body 1. The lower surface of the flat part of one end of the connecting conductor 2 is connected to the upper surface of the boss 1a. The rotating direction of the moving contact is consistent with the stress direction after welding, so that the rotating direction of the moving contact is not hindered by the stress after welding. At the same time, sufficient current-carrying area is ensured to effectively reduce the temperature rise of the welding position.
[0031] Example 2
[0032] In this embodiment, the boss 1a is located at the lower part of the moving contact body 1, and the lower surface of the boss 1a is flush with the lower surface of the moving contact body 1. The upper surface of the flat portion at one end of the connecting conductor 2 is connected to the lower surface of the boss 1a. The other structures are the same as those in Embodiment 1, and the same effects as those in Embodiment 1 can be achieved.
[0033] 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.
[0034] 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. A connection structure of a moving contact of a circuit breaker, comprising a moving contact body (1), characterized in that: At least one side of the tail of the moving contact body (1) is provided with a boss (1a) extending outwards for connecting to a connecting conductor (2); the connecting conductor (2) is formed by stacking a plurality of flat flexible conductors; one end of the connecting conductor (2) is connected to the tail of the moving contact body (1), and the other end is connected to a conductive bar (3).
2. A connection structure for a moving contact of a circuit breaker according to claim 1, characterized in that: The connecting ends of the flexible conductor are hardened structures.
3. A connection structure for a moving contact of a circuit breaker according to claim 2, characterized in that: A through groove (2b) is provided along the length direction between the hardened structures at both ends.
4. A connection structure for a moving contact of a circuit breaker according to claim 1, characterized in that: The other end of the connecting conductor (2) is provided with a through hole (2a) connected to the conductive bar (3).
5. A connection structure for a moving contact of a circuit breaker according to claim 1, characterized in that: The boss (1a) is located at the rear side of the rotation center (O) of the moving contact.
6. A connection structure for a moving contact of a circuit breaker according to claim 2, characterized in that: The flexible conductor is a plurality of copper foils with a thickness of 0.01 mm to 0.08 mm.
7. A connection structure for a moving contact of a circuit breaker according to claim 1, characterized in that: The boss (1a) is located on the upper part of the moving contact body (1), and the lower surface of the flat part at one end of the connecting conductor (2) is connected to the upper surface of the boss (1a).
8. A connection structure for a moving contact of a circuit breaker according to claim 7, characterized in that: The upper surface of the boss (1a) is flush with the upper surface of the moving contact body (1).
9. A connection structure for a moving contact of a circuit breaker according to claim 1, characterized in that: The boss (1a) is located at the lower part of the moving contact body (1), and the upper surface of the flat part at one end of the connecting conductor (2) is connected to the lower surface of the boss (1a).
10. A connection structure for a moving contact of a circuit breaker according to claim 9, characterized in that: The lower surface of the boss (1a) is flush with the lower surface of the moving contact body (1).