Moving contact assembly with limiting structure and molded case circuit breaker

Abstract

The moving contact assembly with the limiting structure comprises a contact support and a moving contact, the contact support comprises a base and a cover body which are connected with each other, the front end and the rear end of the contact support are respectively provided with a first opening and a second opening, a contact rotating shaft and a buffer chamber are arranged in the contact support, a buffer piece is arranged in the buffer chamber, and the moving contact is arranged in the buffer piece. The moving contact sequentially comprises a rotating part, an extending part and a bearing part, a moving contact is arranged on the side face of the bearing part, the tail of the rotating part is arranged close to the first opening, the extending part penetrates through the second opening, a shaft hole is formed in the rotating part, the bottom of the rotating part extends downwards to form a limiting part, the contact rotating shaft is connected into the shaft hole, and the limiting part is arranged right opposite to the buffering piece. According to the moving contact assembly with the limiting structure, the impact force of the moving contact on the contact support can be reduced, deformation of the contact support caused by long-term use of a molded case circuit breaker is avoided, the matching accuracy of the moving contact and the static contact is ensured, the service life of the molded case circuit breaker is prolonged, and the opening and closing performance of the molded case circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, and in particular to a moving contact assembly with a limiting structure and a molded case circuit breaker. Background Art

[0002] The conductive system of a circuit breaker generally includes a moving contact and a stationary contact. The stationary contact is generally fixed on a base, and the moving contact is movably installed. The moving contact can contact or separate from the stationary contact to achieve the purpose of connecting or disconnecting the circuit breaker. When the moving contact separates from the stationary contact, an arc will be generated, which needs to be extinguished quickly to prevent it from reigniting.

[0003] When the existing molded case circuit breaker is disconnected, the moving contact quickly moves away from the static contact under the action of the reset spring, and the rebound force of the moving contact is very large. In addition, the moving contact is made of metal or metal alloy, while the contact bracket is made of plastic. In this case, it is easy to cause the contact bracket to deform, resulting in the displacement of the moving contact, and then causing poor contact of the contacts, which leads to the scrapping of the molded case circuit breaker. Utility Model Content

[0004] In order to solve the above problems, the technical solution provided by the utility model is:

[0005] A moving contact assembly with a limiting structure comprises a contact bracket and a moving contact, the contact bracket comprises a base and a cover body connected to each other, the front and rear ends of the contact bracket are respectively provided with a first opening and a second opening, the contact bracket is provided with a contact shaft and a buffer chamber, the buffer chamber is provided with a buffer, the moving contact comprises a rotating part, an extension part and a bearing part in sequence, the side of the bearing part is provided with a moving contact, the tail of the rotating part is arranged close to the first opening, the extension part passes through the second opening, an axial hole is opened on the rotating part, the bottom of the rotating part extends downward to form a limiting part, the contact shaft is connected in the axial hole, and the limiting part is arranged opposite to the buffer; when the moving contact contacts with an external static contact, the buffer and the limiting part are separated from each other, and when the moving contact is separated from the external static contact, the buffer and the limiting part are pressed against each other.

[0006] The utility model is further configured such that one end of the buffer member is fixed in the buffer chamber, and the other end of the buffer member extends to the outside of the buffer chamber and is arranged opposite to the limiting portion.

[0007] The utility model is further configured that the inner wall of the buffer chamber is provided with a clamping block, and the clamping block is nested on the buffer component.

[0008] The utility model is further configured that a wire connection hole is provided on the end surface of the rotating part facing the first opening, and a copper braided conductor is connected in the wire connection hole.

[0009] The utility model is further configured such that the side of the bearing portion away from the moving contact protrudes outward to form an arc-striking end.

[0010] The utility model is further configured that a positioning opening is opened on the inner wall of the base, and a positioning plug is provided on the cover body, and the positioning plug is connected in the positioning opening.

[0011] The utility model is further configured that the moving contact is integrally formed.

[0012] A molded case circuit breaker adopts the above-mentioned moving contact assembly with limiting structure.

[0013] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0014] The moving contact assembly with a limiting structure of the technical solution is achieved by arranging a contact shaft and a buffer in the contact bracket. The moving contact is connected in the contact bracket with the contact shaft as the rotation axis. When the molded case circuit breaker is closed, the limiting part on the moving contact and the buffer are in a separated state. When the molded case circuit breaker is switched from closing to opening, the limiting part on the moving contact rotates around the contact shaft toward the buffer, and the buffer is gradually compressed to absorb the rebound force of the moving contact during the disconnection process.

[0015] The movable contact assembly with a limiting structure of the utility model can reduce the impact force of the movable contact on the contact bracket, avoid deformation of the contact bracket caused by long-term use of the molded case circuit breaker, ensure the matching accuracy of the movable contact and the static contact, and improve the service life and opening and closing performance of the molded case circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded view of an embodiment of the utility model.

[0017] Figure 2 This is a three-dimensional diagram of the moving contact of an embodiment of the utility model.

[0018] Figure 3 This is a cross-sectional view of the moving contact of an embodiment of the utility model.

[0019] Figure 4 This is a cross-sectional view of a contact bracket according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components; it can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0023] Example 1

[0024] Combined with Figure 1 To Attachment Figure 4 The technical solution of the utility model is a moving contact assembly with a limiting structure, including a contact support 100 and a moving contact 200, the contact support 100 includes a base 110 and a cover body 120 connected to each other, the front end and the rear end of the contact support 100 are respectively provided with a first opening 130 and a second opening 140, the contact support 100 is provided with a contact shaft 150 and a buffer chamber 160, the buffer chamber 160 is provided with a buffer member 170, the moving contact 200 includes a rotating part 210, an extension part 220 and a bearing part 230 in sequence, the side of the bearing part 230 is provided with a moving contact 231, the The tail of the rotating part 210 is arranged close to the first opening 130, the extending part 220 passes through the second opening 140, the rotating part 210 is provided with an axial hole 211, the bottom of the rotating part 210 extends downward to form a limiting part 240, the contact shaft 150 is connected in the axial hole 211, and the limiting part 240 is arranged opposite to the buffer 170; when the moving contact 200 contacts the external static contact, the buffer 170 and the limiting part 240 are separated from each other, and when the moving contact 200 is separated from the external static contact, the buffer 170 and the limiting part 240 press against each other.

[0025] In the above embodiment, the moving contact assembly with a limiting structure is provided with a contact shaft 150 and a buffer 170 in the contact bracket 100, and the moving contact 200 is connected in the contact bracket 100 with the contact shaft 150 as the rotation axis. When the molded case circuit breaker is closed, the limiting portion 240 on the moving contact 200 and the buffer 170 are in a separated state. When the molded case circuit breaker is converted from closing to opening, the limiting portion 240 on the moving contact 200 rotates around the contact shaft 150 toward the buffer 170, and the buffer 170 is gradually compressed to absorb the rebound force of the moving contact 200 during the breaking process.

[0026] In this embodiment, after the base 110 and the cover 120 are spliced ​​together, the moving contact 200 is relatively fixed (rotatable) in the contact bracket 100 to facilitate the assembly of the moving contact assembly.

[0027] In this embodiment, the contact shaft 150 is inserted into the contact support 100 .

[0028] In this embodiment, one end of the buffer member 170 is fixed in the buffer chamber 160 , and the other end of the buffer member 170 extends to the outside of the buffer chamber 160 and is disposed opposite to the limiting portion 240 .

[0029] In this embodiment, a clamping block 161 is disposed on the inner wall of the buffer chamber 160 , and the clamping block 161 is nested on the buffer member 170 .

[0030] In this embodiment, a wire connection hole 212 is provided on the end surface of the rotating portion 210 facing the first opening 130, and a copper braided conductor 300 is connected to the wire connection hole 212; the opening of the wire connection hole 212 can ensure the reliability of welding between the copper braided conductor 300 and the moving contact 200.

[0031] In this embodiment, the side of the bearing portion 230 away from the moving contact protrudes outward to form an arc-striking end 232. The moving contact 200 is provided with the arc-striking end 232 to increase the arc extinguishing speed.

[0032] In this embodiment, a positioning hole 111 is provided on the inner wall of the base 110, and a positioning plug 121 is provided on the cover 120, and the positioning plug 121 is connected to the positioning hole 111; the plug-in positioning structure can improve the assembly efficiency of the moving contact assembly. In another embodiment, the positioning hole 111 can be provided on the cover 120, and the positioning plug 121 can be provided on the base 110.

[0033] In this embodiment, the moving contact 200 is integrally formed.

[0034] In this embodiment, the buffer member 170 is a spring.

[0035] The moving contact assembly with a limiting structure in the technical solution of the utility model can reduce the impact force of the moving contact on the contact bracket, avoid deformation of the contact bracket caused by long-term use of the molded case circuit breaker, ensure the matching accuracy of the moving contact and the static contact, and improve the service life and opening and closing performance of the molded case circuit breaker.

[0036] Example 2

[0037] The technical solution of the utility model is a molded case circuit breaker, which adopts the moving contact assembly with a limiting structure described in Example 1.

[0038] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A moving contact assembly with a limiting structure, characterized in that: It includes a contact bracket and a moving contact, the contact bracket includes a base and a cover body connected to each other, the front and rear ends of the contact bracket are respectively provided with a first opening and a second opening, the contact bracket is provided with a contact shaft and a buffer chamber, the buffer chamber is provided with a buffer, the moving contact includes a rotating part, an extension part and a bearing part in sequence, the side of the bearing part is provided with a moving contact, the tail of the rotating part is arranged close to the first opening, the extension part passes through the second opening, an axial hole is opened on the rotating part, the bottom of the rotating part extends downward to form a limiting part, the contact shaft is connected in the axial hole, and the limiting part is arranged opposite to the buffer; when the moving contact contacts with the external static contact, the buffer and the limiting part are separated from each other, and when the moving contact is separated from the external static contact, the buffer and the limiting part are pressed against each other.

2. A moving contact assembly with a limiting structure according to claim 1, characterized in that: One end of the buffer member is fixed in the buffer chamber, and the other end of the buffer member extends to the outside of the buffer chamber and is arranged opposite to the limiting portion.

3. A moving contact assembly with a limiting structure according to claim 2, characterized in that: The inner wall of the buffer chamber is provided with a clamping block, and the clamping block is nested on the buffer component.

4. The movable contact assembly with a limiting structure according to claim 1, characterized in that: A wire connection hole is formed on the end surface of the rotating part facing the first opening, and a copper braided conductor is connected in the wire connection hole.

5. A moving contact assembly with a limiting structure according to any one of claims 1 to 4, characterized in that: The side of the bearing portion away from the moving contact protrudes outward to form an arc striking end.

6. A moving contact assembly with a limiting structure according to any one of claims 1 to 4, characterized in that: A positioning opening is provided on the inner wall of the base, and a positioning plug is provided on the cover body, and the positioning plug is connected in the positioning opening.

7. A moving contact assembly with a limiting structure according to any one of claims 1 to 4, characterized in that: The moving contact is integrally formed.

8. A moving contact assembly with a limiting structure according to any one of claims 1 to 4, characterized in that: The buffer member is a spring.

9. A molded case circuit breaker, characterized in that: A moving contact assembly with a limiting structure as described in any one of claims 1 to 8 is adopted.

Images