Contact structure of intelligent miniature circuit breaker

Abstract

The utility model discloses a contact structure of an intelligent miniature circuit breaker. The contact structure comprises a bracket arranged in a circuit breaker shell, a rivet arranged on the bracket, two moving contacts rotationally sleeved outside the rivet, a sleeve rotationally sleeved outside the rivet, and a static contact, the two moving contacts are arranged side by side and are not in contact with each other; the sleeve is located between the two moving contacts and separates the two moving contacts. And the static contact is arranged in the circuit breaker shell and corresponds to the moving contact in position. The utility model has the advantages of scientific and reasonable structure, stability and reliability, sufficient contact final pressure can be provided in the use process, the contact resistance of the contact is small, and the temperature rise accords with the national standard.

Description

Technical Field

[0001] The utility model belongs to the field of electrical equipment technology, and in particular relates to an intelligent miniature circuit breaker contact structure. Background Art

[0002] Currently, there are no 250A frame products for ordinary miniature plug-in circuit breakers in the power distribution industry. In actual use, two 125A circuit breakers are used in parallel. This presents the following problems: During closing, opening, and tripping, the two-pole circuit breaker contacts can easily become asynchronous, causing the current in one pole to exceed the rated current, impacting its electrical life and burning the contacts. Furthermore, the circuit resistance of the two poles cannot be guaranteed to be the same, causing the current in one pole of the two parallel poles to exceed the rated current, resulting in an unqualified temperature rise. Furthermore, the use of two-pole parallel connection does not conform to the trend of integration. Due to these shortcomings, existing miniature plug-in circuit breakers cannot meet the service life and integration requirements of 5G communication cabinets. Therefore, there is an urgent need to design a miniature plug-in circuit breaker product with a 250A frame specifically for 5G needs.

[0003] Currently, the maximum current rating for miniature circuit breakers is only 125A, and 250A is only possible with molded case circuit breakers. Developing a 250A miniature circuit breaker presents numerous challenges, not the least of which is ensuring sufficient contact pressure, minimizing contact resistance, and ensuring that temperature rise complies with national standards. Utility Model Content

[0004] In order to solve the above problems, the purpose of the present utility model is to provide an intelligent miniature circuit breaker contact structure that can ensure sufficient contact final pressure, low contact resistance, and temperature rise that meets national standards.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] An intelligent miniature circuit breaker contact structure includes a bracket mounted within a circuit breaker housing, a rivet mounted on the bracket, two movable contacts rotatably sleeved outside the rivet, a sleeve rotatably sleeved outside the rivet, and a static contact; the two movable contacts are arranged side by side and do not contact each other; the sleeve is located between the two movable contacts and separates the two movable contacts; the static contact is mounted within the circuit breaker housing and corresponds to the position of the movable contacts.

[0007] Furthermore, the sleeve is fixedly connected to one of the moving contacts as a whole, and is in contact with but not fixed to the other moving contact.

[0008] Furthermore, two silver dots arranged side by side are provided at positions of the end of the static contact corresponding to the contact points of the two moving contacts, and the two silver dots correspond one-to-one to the contact points of the two moving contacts.

[0009] Furthermore, the end of the static contact is in a U-shaped arc structure. The design of the U-shaped arc structure makes the end of the static contact have a certain elasticity. When the contact point of the moving contact is pressed on the contact point of the static contact, the end of the static contact is deformed, and under the action of its elastic force, a reverse pressure is applied to the moving contact to ensure reliable contact between the moving contact and the static contact, thereby ensuring sufficient contact final pressure.

[0010] Furthermore, the middle parts of the two moving contacts are rotatably sleeved outside the rivet, and each moving contact has three ends located outside the rivet, namely a contact end, a wiring end and an operating end; the contact end corresponds to the static contact and can contact each other, the wiring end is electrically connected to the output end of the circuit breaker, and the operating end is linked to the circuit breaker operating mechanism.

[0011] Furthermore, the intelligent miniature circuit breaker contact structure also includes two springs, which correspond one-to-one to the moving contacts; one end of the spring is installed on a preset shaft on the inner wall of the circuit breaker housing, and the other end is installed on the operating end of the corresponding moving contact. The moving contact is pulled to rotate, so that the contact end of the moving contact presses the corresponding static contact; under the action of the spring force, the static contact is rotated downward to press the static contact, further ensuring sufficient contact final pressure.

[0012] The utility model has a scientific and reasonable structure, is stable and reliable, can provide sufficient contact final pressure during use, has low contact resistance, and the temperature rise meets the national standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The structure of the present invention will be described in further detail below with reference to the accompanying drawings.

[0014] Figure 1 This is a connection diagram of the contact structure of the intelligent miniature circuit breaker described in the present invention.

[0015] Figure 2 This is a schematic diagram of the installation of the contact structure of the intelligent miniature circuit breaker described in the present invention.

[0016] Figure 3 This is a structural schematic diagram of the contact structure of the intelligent miniature circuit breaker described in the present utility model.

[0017] Figure 4 This is a structural diagram of the static contact of the utility model.

[0018] As shown in the figure: 1-moving contact, 2-static contact, 21-silver point, 22-U-shaped arc structure, 3-circuit breaker housing, 4-sleeve, 5-spring, 6-rivet, 7-bracket, 8-circuit breaker operating mechanism. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The embodiments described are merely a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0020] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of this utility model. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. It should be noted that the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or device. Example

[0022] like Figure 1-3 The embodiment shown provides an intelligent miniature circuit breaker contact structure, which is installed in the circuit breaker housing 3 and is closed or opened under the control of the circuit breaker operating mechanism 8. The intelligent miniature circuit breaker contact structure includes a bracket 7, a rivet 6, a moving contact 1, a sleeve 4, a static contact 2 and a spring 5.

[0023] The bracket 7 is installed in the circuit breaker housing 3 and is a component of the circuit breaker operating mechanism 8 and is used for installing the moving contact 1.

[0024] The rivet 6 is installed on the bracket 7 and is used to install the moving contact 1 in the bracket 7.

[0025] There are two moving contacts 1 and they are arranged in the bracket 7. The two moving contacts 1 are arranged side by side and do not contact each other. At the same time, the middle parts of the two moving contacts 1 are rotatably sleeved outside the rivet 6. Each moving contact 1 has three ends located outside the rivet 6, namely a contact end, a wiring end and an operating end; the contact end corresponds to the static contact 2 and can contact each other, the wiring end is electrically connected to the output end of the circuit breaker through a soft wire and a terminal block, and the operating end is located in the bracket 7 and is linked to the circuit breaker operating mechanism 8.

[0026] The sleeve 4 is rotatably mounted on the rivet 6 and is disposed between the two moving contacts 1 to separate the two moving contacts 1. The sleeve 4 is fixedly connected to one of the moving contacts 1 as a whole, while contacting the other moving contact 1 but not fixed.

[0027] The static contact 2 is installed in the circuit breaker housing 3 and corresponds to the position of the moving contact 1. Two silver dots 21 arranged side by side are provided at the end of the static contact 2 corresponding to the contact points of the two moving contacts 1. The two silver dots 21 correspond to the contact points of the two moving contacts 1 one by one. Figure 4 As shown, the end of the static contact 2 is in a U-shaped arc structure 22. The design of the U-shaped arc structure 22 makes the end of the static contact 2 have a certain elasticity. When the contact point of the moving contact 1 is pressed on the silver point 21 of the static contact 2, the end of the static contact 2 is deformed. Under the action of its elastic force, a reverse pressure is applied to the moving contact 1 to ensure reliable contact between the moving contact 1 and the static contact 2, thereby ensuring sufficient contact final pressure.

[0028] There are two springs 5, and the two springs 5 ​​correspond one to one with the moving contacts 1. One end of the spring 5 is mounted on a shaft preset on the inner wall of the circuit breaker housing 3, and the other end is mounted on the operating end of the corresponding moving contact 1. When the moving contact 1 is pulled to rotate, the contact end of the moving contact 1 presses against the corresponding static contact 2. Under the action of the spring force, the moving contact 1 rotates downward to press against the static contact 2, further ensuring sufficient contact final pressure.

[0029] In the closed state, the two moving contacts 1 are restricted in axial movement by the sleeve. Under the action of the spring force, they rotate downward to press the static contact. Under the function of the spring 5 and the U-shaped arc structure 22 on the static contact 2, sufficient contact terminal pressure is provided for the use of a 250A miniature circuit breaker. The current is divided on the two moving contacts, thereby reducing the contact resistance and ensuring that the temperature rise meets the national standard.

[0030] Other aspects of the present invention that are not described in detail are all conventional technologies known to those skilled in the art.

[0031] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such process, method, article, or apparatus.

[0032] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An intelligent miniature circuit breaker contact structure, comprising a bracket mounted in a circuit breaker housing, characterized in that: It also includes a rivet installed on the bracket, two moving contacts rotatably sleeved outside the rivet, a sleeve rotatably sleeved outside the rivet, and a static contact; the two moving contacts are arranged side by side and do not contact each other; the sleeve is located between the two moving contacts and separates the two moving contacts; the static contact is installed in the circuit breaker housing and corresponds to the position of the moving contact.

2. The intelligent miniature circuit breaker contact structure according to claim 1, characterized in that: The sleeve is fixedly connected to one of the moving contacts as a whole, and is in contact with but not fixed to the other moving contact.

3. The intelligent miniature circuit breaker contact structure according to claim 1, characterized in that: Two silver dots arranged side by side are provided at the positions of the end of the static contact corresponding to the contact points of the two moving contacts, and the two silver dots correspond one to one with the contact points of the two moving contacts.

4. The intelligent miniature circuit breaker contact structure according to claim 1, characterized in that: The end of the static contact is in a U-shaped arc structure.

5. The intelligent miniature circuit breaker contact structure according to claim 1, characterized in that: The middle parts of the two moving contacts are rotatably sleeved outside the rivet. Each moving contact has three ends located outside the rivet, namely the contact end, the wiring end and the operating end; the contact end corresponds to the static contact and can contact each other, the wiring end is electrically connected to the output end of the circuit breaker, and the operating end is linked to the circuit breaker operating mechanism.

6. The intelligent miniature circuit breaker contact structure according to claim 5, characterized in that: It also includes two springs, which correspond to the moving contacts one by one; one end of the spring is installed on a preset shaft on the inner wall of the circuit breaker housing, and the other end is installed on the operating end of the corresponding moving contact. The moving contact is pulled to rotate, so that the contact end of the moving contact presses the corresponding static contact.

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