A sealed structure of a molded case circuit breaker

Abstract

The application belongs to the technical field of low-voltage electrical switch, and particularly relates to a sealing structure of a molded case circuit breaker. A circular groove is formed on a shell, and a flange is formed on an insulating baffle ring, the flange of the insulating baffle ring is inserted into the circular groove, and thus, side air leakage during breaking arc can be avoided.

Description

Technical Field

[0001] This application belongs to the field of low-voltage electrical switch technology, and in particular relates to a sealing structure for a molded case circuit breaker. Background Technology

[0002] As a protective component in power transmission and distribution systems, circuit breakers can quickly disconnect the circuit when a fault current occurs, ensuring the safety of the circuit, electrical appliances, and personnel. Among these features, the breaking capacity of a circuit breaker is one of the most important performance characteristics of the product.

[0003] Sealing is one of the important factors affecting the breaking performance of circuit breakers. The sealing of double-break molded case circuit breakers mostly uses an insulating gasket on both sides of the shaft. Due to fit issues, it is impossible to achieve 100% sealing. Therefore, during breaking, there will be more or less air leakage, which will affect the arc ignition and current limiting capabilities. In severe cases, it can lead to excessive arc energy, contact burnout, shell rupture and other faults. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0005] A sealing structure for a molded case circuit breaker includes a housing, a rotating shaft disposed on the housing, and a retaining ring;

[0006] The retaining ring is disposed in the gap between the housing and both ends of the rotating shaft;

[0007] The housing has a circular groove along the outer contour of the rotating shaft, and the retaining ring has a retaining ring flange that matches the circular groove.

[0008] Preferably, the retaining ring is an insulating retaining ring.

[0009] Preferably, the molded case circuit breaker is a rotating double-break molded case circuit breaker.

[0010] Preferably, the rotating shaft is fixed to the retaining ring.

[0011] Preferably, the rotating shaft is fixed to the retaining ring by a protruding shaft hole thereon.

[0012] A molded case circuit breaker, comprising a molded case circuit breaker sealing structure as described in any of the preceding claims.

[0013] Compared with the prior art, the beneficial effects achieved by this application are: this application relates to a sealing structure, which has a circular groove on the shell and a flange on the insulating retaining ring. By inserting the flange of the retaining ring into the groove, side air leakage can be avoided when the electric arc is interrupted.

[0014] When the circuit breaker begins its breaking action, the shaft rotates. This rotation, via limiting features (such as protruding shaft holes), causes the insulating retaining ring to rotate as well. The flange of the insulating retaining ring inserts into a groove in the housing. Even if the insulating retaining ring rotates or tilts, a large gap will not form between the flange and the groove, ensuring that the insulating retaining ring will not experience gaps due to assembly, rotation, or tilting issues when breaking the arc.

[0015] The aforementioned tilting refers to the fact that the rotating shaft in the prior art is not perfectly horizontal during rotation and may tilt. The insulating sheet is installed in the gap between the rotating shaft and the outer casing. This gap cannot be perfectly sized; it will definitely be larger than the thickness of the insulating sheet. Therefore, the insulating sheet will not be completely flat in the gap and will be slightly tilted. Once it is slightly tilted, air leakage will occur. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the shaft and retaining ring structure of a molded case circuit breaker in the prior art;

[0018] Figure 2 These are the main view and AA sectional view of the sealed structure of a molded case circuit breaker without the rotating shaft installed;

[0019] Figure 3 This is a schematic diagram of the combined structure of the retaining ring and the rotating shaft in this application;

[0020] Figure 4 These are the main view and AA sectional view of the sealing structure of the molded case circuit breaker with the shaft installed;

[0021] In the figure: housing 1; circular groove 11; rotating shaft 2; raised shaft hole 21; retaining ring 3; retaining ring flange 31. Detailed Implementation

[0022] 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, and 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.

[0023] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection 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.

[0025] like Figures 2-4 As shown, this embodiment provides a sealing structure for a molded case circuit breaker, comprising a retaining ring 3 and a housing 1. A circular groove 11 is carved into the housing 1 along the outer contour of the rotating shaft 2. The retaining ring 3 can be an insulating retaining ring 3, with its outermost edge turned up and inserted into the groove. The sealing process is completed by inserting the retaining ring's turned-up edge 31 into the circular groove 11. The diameter of the insulating retaining ring 3 matches the diameter of the rotating shaft 2.

[0026] This application relates to a sealing structure, in which a circular groove 11 is opened on the shell and an insulating retaining ring 3 is flanged. The flange of the retaining ring is inserted into the groove, which can prevent side leakage when the electric arc is interrupted.

[0027] When the circuit breaker begins its breaking action, the shaft rotates. As the shaft rotates, it drives the insulating retaining ring to rotate along with it through a limiting feature (such as the protruding shaft hole 21 on the shaft). The flange of the insulating retaining ring 3 is inserted into the groove of the housing. Even if the insulating retaining ring rotates or tilts, the flange and the groove will not form a large gap, ensuring that the insulating retaining ring 3 will not have gaps due to assembly, rotation, or tilting issues when breaking the arc.

[0028] The aforementioned tilt refers to the fact that the rotating shaft in the prior art is not perfectly horizontal during rotation (i.e., the two opposing surfaces of the shaft and the housing are not perfectly horizontal), and may tilt. The insulating sheet is installed in the gap between the shaft and the housing. This gap cannot be perfectly sized; it will certainly be larger than the thickness of the insulating sheet. Therefore, the insulating sheet will not be completely flat in the gap, but will be slightly tilted. Once it is slightly tilted, air leakage will occur.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A sealing structure for a molded case circuit breaker, characterized in that, It includes a housing (1), a rotating shaft (2) disposed on the housing (1), and a retaining ring (3); The retaining ring (3) is disposed in the gap between the housing (1) and the two ends of the rotating shaft (2); The housing (1) has a circular groove (11) along the outer contour of the rotating shaft (2), and the retaining ring (3) has a retaining ring flange (31) that matches the circular groove (11).

2. The sealing structure of a molded case circuit breaker as described in claim 1, characterized in that, The retaining ring (3) is an insulating retaining ring.

3. The sealing structure of a molded case circuit breaker as described in claim 1, characterized in that, The molded case circuit breaker mentioned is a rotating double-break molded case circuit breaker.

4. The sealing structure of a molded case circuit breaker as described in claim 1, characterized in that, The rotating shaft (2) and the retaining ring (3) are fixed in a limiting position.

5. The sealing structure of a molded case circuit breaker as described in claim 4, characterized in that, The rotating shaft (2) is fixed to the retaining ring (3) by means of the protruding shaft hole (21) provided thereon.

6. A molded case circuit breaker, characterized in that, Includes a molded case circuit breaker sealing structure as described in any one of claims 1 to 5.

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