A chamber structure of a molded case circuit breaker

Abstract

The utility model discloses a chamber structure of moulded case circuit breaker, including middle lid and base, the middle lid and base are installed together and form the installation shell of moulded case circuit breaker, the one side of middle lid faces base and base and enclose chamber no.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to a chamber structure of a molded case circuit breaker. Background Technology

[0002] When a circuit breaker cuts off a large current such as a short-circuit current, an electric arc will occur between the fixed contact and the movable contact. The high temperature and high pressure of the arc gas can sometimes cause damage to the opening and closing mechanism and the overcurrent tripping device.

[0003] Chinese patent CN200710106325.8 discloses a circuit breaker that prevents damage to the partition caused by increased internal pressure. It isolates the circuit breaker section (including fixed contacts, movable contacts, and an arc-extinguishing chamber) from the load side (including the switching mechanism and overcurrent tripping device) using a partition. The circuit breaker section, including the fixed contacts, movable contacts, and support frame, as well as the arc-extinguishing chamber, are housed in a housing. The tripping mechanism (including the trip lever) and the switching mechanism are housed in a middle cover. A conductive connecting plate, such as a metal connecting plate, isolates the circuit breaker section from the load side (including the switching mechanism and overcurrent tripping device). The circuit breaker's interior is divided into an arc-extinguishing chamber contact chamber and a tripping mechanism chamber, with the two chambers operating independently. However, the partition assembly that isolates the two chambers at the rear end of the contact shaft is made of metal plate. The metal particles and high-temperature, high-pressure gas generated during arc extinguishing will splash backward and affect it. Moreover, this metal plate is part of the conductive circuit, which can easily cause instability in the contact system. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing isolation chamber components made of metal, where metal particles and high-temperature, high-pressure gases generated during arc extinguishing can splash backward and have adverse effects. This invention provides a chamber structure for a molded case circuit breaker that separates the circuit breaker's corresponding systems, improving protection, enhancing arc extinguishing capability, and reducing the adverse effects of electric arc on various related systems.

[0005] Technical solution

[0006] To achieve the above technical objectives, this utility model provides a chamber structure for a molded case circuit breaker, including a middle cover and a base. The middle cover and the base are assembled together to form the mounting housing of the molded case circuit breaker. The side of the middle cover facing the base and the base form a chamber one. The space on the side of the middle cover facing away from the base forms a chamber two. The arc-extinguishing chamber and the contact system are arranged in the chamber one, and the operating mechanism and the trip unit are arranged in the chamber two.

[0007] The inner side of the middle cover extends into a side wall and a bottom wall, and the side wall, bottom wall, and base form a cavity.

[0008] The bottom wall is located between the contact system and the trip unit;

[0009] The base is equipped with a rear conductive element, and the lower end face of the bottom wall extends to the upper surface of the horizontally extending portion of the rear conductive element. The bottom wall, the rear conductive element, and the base isolate the contact system and the trip unit.

[0010] Preferably, the sidewalls and bottom wall are made of plastic.

[0011] Preferably, the side wall is provided with an operating mechanism through hole connecting chamber one and chamber two.

[0012] Preferably, the sidewall and the bottom wall are integral.

[0013] Preferably, the contact system includes a moving contact, an arc-blocking cover fitted onto the moving contact, and a cover that moves with the moving contact.

[0014] Preferably, the arc-isolating cover is provided with a raised partition, which can separate the rotating shaft and its rear conductive component from the first chamber during the movement of the follow contact opening, so that the first chamber is further divided into the third chamber and the fourth chamber.

[0015] Beneficial effects

[0016] This utility model provides a chamber structure for a molded case circuit breaker, including a middle cover 1 and a base 2. The middle cover 1 and the base 2 are assembled together to form the mounting housing of the molded case circuit breaker. The side of the middle cover 1 facing the base 2 and the base 2 together form a first chamber 3. The space on the side of the middle cover 1 facing away from the base 2 forms a second chamber 4. An arc-extinguishing chamber 12 and a contact system 13 are arranged in the first chamber 3, and an operating mechanism 14 and a trip unit 15 are arranged in the second chamber 4. This separation of the circuit breaker's corresponding systems improves protection, enhances arc-extinguishing capability, and reduces the adverse effects of electric arc on various related systems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Appendix Figure 1 This is a top view of the molded case circuit breaker in an embodiment of this utility model;

[0019] Appendix Figure 2 It is attached Figure 1 Sectional view along line A;

[0020] Appendix Figure 3This is a three-dimensional schematic diagram of the positions of the cover and the base in an embodiment of this utility model;

[0021] Appendix Figure 4 This is a schematic diagram of the cover structure in an embodiment of this utility model;

[0022] Appendix Figure 5 This is a schematic diagram of the base structure in an embodiment of this utility model;

[0023] Appendix Figure 6 This is a schematic diagram of the arc-blocking cover partition cavity in an embodiment of this utility model;

[0024] Appendix Figure 7 This is a schematic diagram of the arc-blocking cover product in the embodiments of this utility model. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may 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 present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0027] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] 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 and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0030] Example

[0031] The existing isolation chamber components are made of metal, and the backward splashing of metal particles and high-temperature, high-pressure gases generated during arc extinguishing can adversely affect their performance. To solve this problem, as shown in the attached... Figure 1 As shown in Figures 2 and 3, this embodiment provides a chamber structure for a molded case circuit breaker, including a middle cover 1 and a base 2. The middle cover 1 and the base 2 are assembled together to form the mounting housing of the molded case circuit breaker. The side of the middle cover 1 facing the base 2 and the base 2 together form a first chamber 3. The space on the side of the middle cover 1 facing away from the base 2 forms a second chamber 4. An arc-extinguishing chamber 12 and a contact system 13 are arranged in the first chamber 3, and an operating mechanism 14 and a trip unit 15 are arranged in the second chamber 4. This structure reduces the adverse effects of electric arc on the mechanism and the trip unit.

[0032] Among them, as attached Figure 4 As shown, a side wall 5 and a bottom wall 6 extend from the inner side of the middle cover 1, and the side wall 5 and the bottom wall 6 are integrally formed. The side wall 5, the bottom wall 6, and the attached... Figure 5The base 2 shown encloses chamber 3. The side walls 5 and bottom wall 6 are made of plastic. An operating mechanism through-hole 7 is provided on the side wall 5, connecting chamber 3 and chamber 4. The bottom wall 6 is located between the contact system 13 and the trip unit 15, isolating them. The circuit breaker also includes a rear-end conductive element 11 extending at least partially horizontally, which connects the moving contact to the terminal. One end of the rear-end conductive element 11 is connected to a flexible connector (not shown), the other end of the flexible connector is connected to the moving contact 13a, and the other end of the rear-end conductive element 11 is connected to the thermal element of the trip unit. The rear-end conductive element 11 is mounted on the base 2. The lower end face of the bottom wall 6 extends to the upper surface of the horizontally extending portion of the rear-end conductive element 11, abutting against or having a slight gap with the upper surface. The bottom wall 6, the rear-end conductive element 11, and the base 2 isolate the contact system 13 and the trip unit 15. Since the area of ​​the rear conductive component 11 in the chamber 3 is very small, the metal particles and high-temperature and high-pressure gas splashed backward generated by the arc extinguishing will have little effect on it and will not cause instability in the contact system.

[0033] Meanwhile, the arc-blocking cover 8 is fitted onto the moving contact 13a and can move together with the moving contact 13a. (See attached diagram) Figure 7 As shown, the arc-isolating cover 8 is provided with a raised baffle 9. During the movement of the follow contact 13a as it opens, the arc-isolating cover 8 can separate the rotating shaft 10 and its rear conductive component 11 from the chamber 3, so that the chamber 3 is further divided into the following sections. Figure 6 The chambers 3a and 3b shown improve protection, allowing the arc to enter the arc-extinguishing chamber better, better protecting the conductive components behind the moving contact, and hindering the backward flow of air, thus improving the arc-extinguishing effect.

[0034] This utility model provides a chamber structure for a molded case circuit breaker, including a middle cover 1 and a base 2. The middle cover 1 and the base 2 are assembled together to form the mounting housing of the molded case circuit breaker. The side of the middle cover 1 facing the base 2 and the base 2 together form a first chamber 3. The space on the side of the middle cover 1 facing away from the base 2 forms a second chamber 4. An arc-extinguishing chamber 12 and a contact system 13 are arranged in the first chamber 3, and an operating mechanism 14 and a trip unit 15 are arranged in the second chamber 4. This separation of the circuit breaker's corresponding systems improves protection, enhances arc-extinguishing capability, and reduces the adverse effects of electric arc on various related systems.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A chamber structure for a molded case circuit breaker, comprising a middle cover (1) and a base (2), wherein the middle cover (1) and the base (2) are assembled together to form the mounting housing of the molded case circuit breaker, characterized in that: The middle cover (1) facing the base (2) and the base (2) form a first chamber (3). The space on the side of the middle cover (1) facing away from the base (2) forms a second chamber (4). The arc extinguishing chamber (12) and the contact system (13) are arranged in the first chamber (3). The operating mechanism (14) and the trip unit (15) are arranged in the second chamber (4). The inner side of the middle cover (1) has a side wall (5) and a bottom wall (6) extending out, and the side wall (5), the bottom wall (6) and the base (2) form a chamber (3); The bottom wall (6) is located between the contact system (13) and the trip unit (15); The base (2) is equipped with a rear conductive element (11), and the lower end face of the bottom wall (6) extends to the upper surface of the horizontally extending portion of the rear conductive element (11). The bottom wall (6), the rear conductive element (11) and the base (2) isolate the contact system (13) and the trip unit (15).

2. The chamber structure of a molded case circuit breaker as described in claim 1, characterized in that: The sidewalls (5) and bottom wall (6) are made of plastic.

3. The chamber structure of a molded case circuit breaker as described in claim 1, characterized in that: The side wall (5) is provided with an operating mechanism through hole (7) that connects chamber one (3) and chamber two (4).

4. The chamber structure of a molded case circuit breaker as described in claim 1, characterized in that: The sidewall (5) and bottom wall (6) are integral.

5. The chamber structure of a molded case circuit breaker as described in claim 1, characterized in that: The contact system (13) includes a moving contact (13a), and an arc shield (8) is fitted onto the moving contact (13a) and can move together with the moving contact (13a).

6. The chamber structure of a molded case circuit breaker as described in claim 5, characterized in that: The arc shield (8) is provided with a raised partition (9). When the arc shield (8) moves as the follow contact (13a) opens, it can separate the rotating shaft (10) and its rear conductive component (11) from the first chamber (3), so that the first chamber (3) is further divided into the third chamber (3a) and the fourth chamber (3b).

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