A contact system and circuit breaker
Patent Information
- Application Number
- CN202522457095.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-19
AI Technical Summary
原因在于，如上方示例的一样，不同壳架的每相动触头的总宽度是不同的（例如1600A 它是5片动触片的总宽度，1250A则是3片动触片的总宽度），所以大一级壳架的转轴如果应用在小一极壳架中，动触头安装腔与动触头之间会存在大缝隙，动触头将无法稳定装配；而小一级壳架的转轴如果应用在大一极壳架中，动触头安装腔的宽度又过窄，无法动触头
[0020]本申请相比于现有技术的有益效果：采用结构，利用补偿件对动触头安装槽宽度尺寸（第一方向尺寸）大于动触头宽度尺寸的情形进行补偿，使得大一点壳架的转轴也能应用在小一点壳架的断路器中，可以使得至少两种断路器共用一副转轴，提高了转轴通用性，降低了成本。
Smart Images
Figure CN224907943U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the electrical field, specifically to a circuit breaker, and more particularly to a contact system within a circuit breaker. Background Technology
[0002] In the field of low-voltage electrical appliances, molded case circuit breakers are classified according to the number of poles, including single-pole circuit breakers, two-pole circuit breakers, three-pole circuit breakers, four-pole circuit breakers, etc. A single-pole circuit breaker has one phase moving contact, a two-pole circuit breaker has two phase moving contacts, and so on. Regardless of the number of poles, the moving contacts of a circuit breaker are all mounted on the same rotating shaft. For example, a three-pole circuit breaker has three moving contact mounting cavities on the rotating shaft, arranged sequentially along the axial direction of the shaft. Each moving contact mounting cavity houses one phase moving contact, and the width of each moving contact mounting cavity is approximately exactly the same as the total width of each phase moving contact.
[0003] Molded case circuit breakers have a very wide range of current ratings, from as low as 32A to as high as 1600A.
[0004] For large housings, the dimensions of their rotating shafts (or moving contact supports) are generally similar. However, because the larger the housing, the greater the current each phase moving contact needs to handle, the number of moving contact pieces per phase varies with the size of the housing. For example, a 1600A housing might require 5 moving contact pieces per phase; a 1250A housing might only require 3.
[0005] Currently, for molded case circuit breakers, each manufacturer designs an independent shaft for the moving contacts of each frame, making compatibility between different frames impossible. This is because, as illustrated in the example above, the total width of the moving contacts per phase differs between different frames (e.g., 1600A has the total width of 5 moving contact pieces, while 1250A has the total width of 3). Therefore, if a shaft from a larger frame is used in a smaller frame, a large gap will exist between the moving contact mounting cavity and the moving contact, preventing stable assembly. Conversely, if a shaft from a smaller frame is used in a larger frame, the width of the moving contact mounting cavity is too narrow, making it impossible to move the contact.
[0006] Therefore, the key to achieving compatibility between circuit breakers with different frame structures is to find a shaft with a slightly larger moving contact mounting cavity width (larger than the width of each phase moving contact) that can be used in circuit breakers with a slightly smaller moving contact width (smaller than the width of the moving contact mounting cavity). This will greatly reduce the material management costs for enterprises. Summary of the Invention
[0007] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a contact system.
[0008] This application provides: a contact system comprising at least one set of moving contacts and a rotating shaft; wherein... The rotating shaft has at least one moving contact mounting cavity. Each moving contact mounting cavity is used to mount a set of moving contacts. One end of the moving contact is inside the moving contact mounting cavity, and the other end extends out of the rotating shaft. Each set of moving contacts includes at least one moving contact piece arranged along a first direction, which is the axial direction of the rotating shaft; The thickness of the moving contact piece in the first direction is a first dimension, and the dimension between at least one cavity wall of the moving contact mounting cavity and the moving contact in the first direction is a second dimension, which is greater than the first dimension; In the first direction, a compensation member is provided between the cavity wall having a second dimension and the moving contact, and the thickness of the compensation member in the first direction is not greater than the second dimension and not less than the first dimension.
[0009] In some embodiments of this application, the compensation element is always located in the moving contact mounting cavity.
[0010] In some embodiments of this application, the cavity walls of the moving contact mounting cavity in the first direction are a first cavity wall and a second cavity wall, and the first cavity wall, the second cavity wall and the moving contact each have a second dimension.
[0011] In some embodiments of this application, each set of moving contacts includes three moving contact pieces arranged along a first direction. The cavity walls of the moving contact mounting cavity in the first direction are a first cavity wall and a second cavity wall, respectively. The first cavity wall, the second cavity wall and the moving contact each have a second dimension. The moving contact has compensation members on both sides in the first direction.
[0012] In some embodiments of this application, a compensation member fixing structure is also included. The compensation member fixing structure is connected to the rotating shaft, and the compensation member is installed in the moving contact mounting cavity through the compensation member fixing structure.
[0013] In some embodiments of this application, each set of moving contacts further includes a mounting pin, which is connected to the cavity wall of the moving contact mounting cavity, and the moving contact piece is sleeved on the mounting pin.
[0014] In some embodiments of this application, each set of moving contacts also includes a mounting pin. The mounting pin is a compensation component fixing structure. The mounting pin is connected to the cavity wall of the moving contact mounting cavity. The moving contact piece and the compensation component are both sleeved on the mounting pin.
[0015] In some embodiments of this application, the number of moving contact mounting cavities is at least two, and they are arranged sequentially along a first direction; a mounting hole is provided on the rotating shaft, the mounting hole penetrates the rotating shaft along the first direction and communicates with the moving contact mounting cavity, and the two ends of the mounting pin are connected to the cavity wall of the moving contact mounting cavity by being inserted into part of the mounting hole.
[0016] In some embodiments of this application, an insulating filler is also included, which is disposed in the mounting hole and fills the space between the mounting pins of two adjacent sets of moving contacts.
[0017] In some embodiments of this application, the compensation element is a rigid insulating material or a rigid conductive material.
[0018] In some embodiments of this application, the shape of the compensation component is a regular or irregular shape.
[0019] A circuit breaker includes a circuit breaker housing, and further includes the aforementioned contact system, wherein the rotating shaft is rotatably disposed from the circuit breaker housing.
[0020] The advantages of this application compared to the prior art are as follows: By adopting a structure and using a compensation component, the width dimension (first direction dimension) of the moving contact mounting groove is compensated for when it is greater than the width dimension of the moving contact, so that the shaft of a larger frame can also be used in a circuit breaker with a smaller frame. This allows at least two types of circuit breakers to share a shaft, improving the shaft's versatility and reducing costs. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 A schematic diagram of a contact system according to an embodiment of this application is shown; Figure 2 A front view of a contact system according to an embodiment of this application is shown; Figure 3 It shows Figure 2 Sectional view of AA; Figure 4 A compensation schematic diagram of an embodiment of this application is shown; Figure 5 A schematic diagram of five movable contact pieces sharing a single rotating shaft with the embodiments of this application is shown. Detailed Implementation
[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example
[0028] like Figures 1-4 As shown, an embodiment of this application is a circuit breaker, specifically a molded case circuit breaker.
[0029] Such a molded case circuit breaker necessarily includes a circuit breaker housing (not shown) and a contact system that is rotatably configured with respect to the circuit breaker housing.
[0030] The contact system includes a rotating shaft 100 and three sets of moving contacts 200. Three sets of moving contacts 200 are used here because the circuit breaker is a three-pole circuit breaker. In addition, depending on the number of poles of the circuit breaker, different numbers of moving contacts 200 can be used.
[0031] The rotating shaft 100 has its length in the axial direction, which is the first direction P1 mentioned below. The rotating shaft 100 has moving contact mounting cavities 100a that are adapted to the number of moving contacts 200, and each group of moving contacts 200 is installed in one moving contact mounting cavity 100a.
[0032] Here, one end of the moving contact 200 in the longitudinal direction is located inside the moving contact mounting cavity 100a, and the other end in the longitudinal direction extends to the outside of the rotating shaft 100. The extended part has a moving contact point for cooperating with the stationary contact.
[0033] In this embodiment, each set of moving contacts 200 includes three moving contact pieces 210 and a mounting pin 220, and the three moving contact pieces 210 are arranged sequentially along the first direction P1.
[0034] The cavity walls of the moving contact mounting cavity 100a in the first direction P1 are a first cavity wall 101 and a second cavity wall 102.
[0035] The two ends of the mounting pin 220 are inserted into the first cavity wall 101 and the second cavity wall 102, and the three movable contact pieces 210 are sleeved on the mounting pin 220.
[0036] Here, there are two ways to fix the mounting pin 220. One way is to open blind holes in the first cavity wall 101 and the second cavity wall 102, and insert the mounting pin 220 into the blind holes. With this structure, the electrical clearance between two adjacent moving contacts 200 will be larger, making it less prone to phase-to-phase breakdown.
[0037] Another method employs a mounting hole 110 on the rotating shaft 100. The mounting hole 110 is a through hole opened along the first direction P1, penetrating the entire rotating shaft 100, and thus communicating with each moving contact mounting cavity 100a. The mounting pin 220 of each group of moving contacts 200 can be inserted into the corresponding mounting hole 110. This embodiment uses this structure, which makes assembly relatively easier.
[0038] For this type of through-hole mounting hole 110, an insulating filler 120 is also provided inside the mounting hole 110 to improve the electrical clearance between adjacent moving contacts 200. The insulating filler 120 is also provided in a portion of the mounting hole 110, specifically filling the space between the mounting pins 220 of adjacent sets of moving contacts 200. This greatly improves the electrical clearance between adjacent phases and reduces the possibility of phase-to-phase breakdown. Many simple materials can be used for the insulating filler; soft materials such as rubber can be used, as well as relatively hard materials such as plastics, epoxy resin composites, etc. Any material with insulating properties is acceptable.
[0039] In the first direction P1, a second dimension d2 exists between the first cavity wall 101 and the moving contact 200, and a second dimension d2 also exists between the second cavity wall 102 and the moving contact 200. The thickness of the single moving contact piece 210 in the first direction P1 is the first dimension d1. Here, the second dimension d2 is greater than the first dimension d1; simply put, the distance between the cavity wall of the moving contact mounting cavity 100a and the moving contact 200 is greater than the thickness of the moving contact piece 210.
[0040] Because of this size relationship, a compensation element 300 is required. In the first direction P1, the compensation element 300 is located between the first cavity wall 101 and the moving contact 200, and between the second cavity wall 102 and the moving contact 200. Here, the thickness dimension d3 of the compensation element 300 in the first direction is not less than the first dimension d1 and not greater than the second dimension d2. Because of the addition of this compensation element 300, when the shaft 100 of a larger-sized circuit breaker is used in a smaller-sized circuit breaker, the compensation element 300 can prevent the moving contact 200 from wobbling along the first direction P1 (if the compensation element 300 is not present, the gap between the moving contact 200 and the cavity wall in the first direction P1 would be too large and prone to wobbling). It is equivalent to using the compensation element 300 to complete the limitation of the moving contact 200 that originally required the cavity wall, providing a possibility for a single shaft 100 to be used for both large and small housings.
[0041] Of course, it is not always necessary to set two compensation members 300 here. In some cases where only the first cavity wall 101 or the second cavity wall 102 has a second dimension d2 between it and the moving contact 200 (for example, one side of the moving contact 200 is close to the first cavity wall 101 or the second cavity wall 102), in this case, it is only necessary to set the compensation member 300 on the side of the moving contact 200 with the second dimension d2 to achieve the same effect.
[0042] like Figure 1 and Figure 5As shown, one moving contact 200 has 5 moving contact pieces 210, and the other moving contact 200 has 3 moving contact pieces 210. Because of the filler, the two can share a rotating shaft 100. Of course, the values here are just an example and are not limited to this situation. For example, a circuit breaker with 3 moving contact pieces 210 and a circuit breaker with 1 moving contact piece 210 can share a rotating shaft 100, or a circuit breaker with 4 moving contact pieces 210 and a circuit breaker with 2 moving contact pieces 210 can share a rotating shaft 100. There are many such cases, which will not be listed here.
[0043] Here, the overall size of the compensation member 300 is smaller than the volume of the moving contact mounting cavity 100a, so the compensation member 300 can always be in the moving contact mounting cavity 100a.
[0044] The compensation component 300 has a fixing structure, which fixes it in the mounting cavity. The fixing structure can be implemented in many ways; it can be related to the installation of the moving contact 200 or not.
[0045] As a relatively simple method, the installation of the moving contact 200 is related to the installation of the compensation component 300. In this case, the installation structure of the compensation component 300 is the installation pin 220, and the compensation component 300 is also fitted onto the installation pin 220. This fixing method is very simple.
[0046] As an alternative, the compensating part 300 and the rotating shaft 100 can be connected by plugging (for example, the rotating shaft 100 has a dovetail groove and the compensating part 300 has a matching protrusion), screw connection, or riveting. In this type of fixing method, the installation of the compensating part 300 is independent of the moving contact 200, and the installation structure is relatively more complicated.
[0047] Here, the material of the compensation component 300 can be either a rigid conductive material, such as copper, iron, copper alloys, or other metals or alloys; or a rigid insulating material, such as engineering plastics. As long as it is a rigid material, it can limit the movement of the moving contact 200 and restrict its offset in the first direction P1.
[0048] In this embodiment, the supplementary component is circular in shape. However, the compensating component 300 can also be any other regular or irregular shape, as long as it can limit the movement of the moving contact 200; the specific shape is not limited.
[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0050] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A contact system comprising at least one set of moving contacts and a rotating shaft; characterized in that: The rotating shaft has at least one moving contact mounting cavity. Each moving contact mounting cavity is used to mount a set of moving contacts. One end of the moving contact is inside the moving contact mounting cavity, and the other end extends out of the rotating shaft. Each set of moving contacts includes at least one moving contact piece arranged along a first direction, which is the axial direction of the rotating shaft; The thickness of the moving contact piece in the first direction is a first dimension, and the dimension between at least one cavity wall of the moving contact mounting cavity and the moving contact in the first direction is a second dimension, which is greater than the first dimension; In the first direction, a compensation member is provided between the cavity wall having a second dimension and the moving contact, and the thickness of the compensation member in the first direction is not greater than the second dimension and not less than the first dimension.
2. The contact system according to claim 1, characterized in that: The compensation component is always located in the moving contact mounting cavity.
3. A contact system according to claim 1, characterized in that: The moving contact mounting cavity has a first cavity wall and a second cavity wall in the first direction, and both the first cavity wall and the second cavity wall have a second dimension between them and the moving contact.
4. A contact system according to claim 1, characterized in that: Each set of moving contacts includes three moving contact pieces arranged along a first direction. The cavity walls of the moving contact mounting cavity in the first direction are a first cavity wall and a second cavity wall, respectively. The first cavity wall, the second cavity wall and the moving contact each have a second dimension. The moving contact has compensation members on both sides in the first direction.
5. A contact system according to claim 1, 2, 3, or 4, characterized in that: It also includes a compensation component fixing structure, which is connected to the rotating shaft, and the compensation component is installed in the moving contact mounting cavity through the compensation component fixing structure.
6. A contact system according to claim 5, characterized in that: Each set of moving contacts also includes a mounting pin, which is connected to the cavity wall of the moving contact mounting cavity, and the moving contact piece is sleeved on the mounting pin; Alternatively, each set of moving contacts may also include a mounting pin, which serves as a compensating element fixing structure. The mounting pin is connected to the cavity wall of the moving contact mounting cavity, and the moving contact piece and compensating element are both sleeved on the mounting pin.
7. A contact system according to claim 6, characterized in that: The number of moving contact mounting cavities is at least two, and they are arranged sequentially along the first direction; a mounting hole is provided on the rotating shaft, the mounting hole passes through the rotating shaft along the first direction and communicates with the moving contact mounting cavity; the two ends of the mounting pin are inserted into part of the mounting hole to connect with the cavity wall of the moving contact mounting cavity.
8. A contact system according to claim 7, characterized in that: It also includes an insulating filler, which is disposed in the mounting hole and fills the space between the mounting pins of two adjacent sets of moving contacts.
9. A contact system according to claim 1, characterized in that: The compensation component is made of rigid insulating material or rigid conductive material; And / or, the shape of the compensation component is a regular or irregular shape.
10. A circuit breaker comprising a circuit breaker housing, characterized in that: It also includes the contact system as described in any one of claims 1-9, wherein the rotating shaft and the circuit breaker housing are rotatably connected.