Improved miniature circuit breaker

Abstract

The utility model discloses an improved miniature circuit breaker, which comprises a shell, a contact support, a moving contact and a tripping piece, the shell is provided with a pin shaft, the pin shaft penetrates through the contact support and the tripping piece to enable the contact support and the tripping piece to move in a linkage mode, the contact support is provided with a cavity with a notch, and the moving contact is arranged in the cavity. The side wall of the cavity is provided with a first abutting part, the cavity is provided with a convex column, the convex column is sleeved with the moving contact, one side of the moving contact is provided with a second abutting part, the other side of the moving contact is provided with an extension part, the convex column is provided with a contact torsion spring, one end of the contact torsion spring abuts against the first abutting part, and the other end of the contact torsion spring is buckled on the extension part. According to the utility model, the moving contact is tightly pressed on the contact support through the contact torsion spring, so that the connection strength of the moving contact and the contact support is prevented from being influenced by high temperature, and a product provides various wiring modes through the arrangement of the first wiring hole and the second wiring hole, thereby facilitating the selection of a user.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an improved miniature circuit breaker. Background Art

[0002] Miniature circuit breakers are important control and protection devices in low-voltage power distribution systems. They can quickly interrupt fault currents when overload or short circuit occurs in the power distribution system, protecting the power distribution system and electrical equipment.

[0003] The operating mechanism of an existing miniature circuit breaker includes a moving contact frame, a tripping member, and a tripping member. The moving contact frame is composed of a contact bracket and a moving contact. The moving contact is fixed to the contact bracket by a thermal riveting process. When a large current continuously passes through the moving contact, the moving contact heats up, causing the thermal expansion coefficient to increase, which in turn affects the connection structure between the moving contact and the contact bracket, causing deformation or even damage. Therefore, the applicant has made a useful design and found a solution to the above-mentioned problem. The technical solution to be introduced below was produced in this context. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional miniature circuit breaker design and provide a product that is anti-deformation and has multiple wiring methods.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions.

[0006] An improved miniature circuit breaker includes a shell, a contact bracket, a moving contact, and a release member. The shell is provided with a pin shaft, and the pin shaft passes through the contact bracket and the release member, so that the contact bracket and the release member move in conjunction with each other. The contact bracket is provided with a cavity with a notch, and the side wall of the cavity is provided with a first interference portion. The cavity is provided with a convex column, and the moving contact is sleeved on the convex column. A second interference portion is provided on one side of the moving contact, and an extension portion is provided on the other side of the moving contact. The convex column is provided with a contact torsion spring, and one end of the contact torsion spring abuts the first interference portion, and the other end is pressed on the extension portion, so that the second interference portion abuts the side wall of the cavity.

[0007] Preferably, the shell is further provided with a support shaft, and first wiring holes are provided at both ends of the shell, and a second wiring hole is provided above the wiring hole.

[0008] Preferably, the support shaft is provided with a tension spring and is connected to the contact bracket so that the contact bracket is tilted in the direction of pulling of the tension spring.

[0009] Preferably, a conductive member is provided in the first wiring hole. The conductive member is provided with a first conductive portion, which is located above the first wiring hole. A second conductive portion is provided above the first conductive portion and is located at the bottom of the second wiring hole. The first conductive portion is provided with a liftable fixing member, and the fixing member is provided with a fastening screw that passes through the second conductive portion.

[0010] Preferably, it further includes a bimetallic strip, and the bimetallic strip is electrically connected to one of the conductive members.

[0011] Preferably, the contact support is provided with a jumping fastener that abuts against the releasing fastener, and a supporting portion is provided at the bottom of the first abutting portion.

[0012] Preferably, a contact head portion is provided on one side of the extending portion. The extending portion is provided with a buckling groove, and the contact torsion spring is buckled in the buckling groove. The moving contact is further provided with a connecting portion, and the connecting portion is electrically connected to the bimetallic strip through a flexible connecting wire.

[0013] Preferably, the housing is provided with a handle, and the handle is provided with a pull rod that is inserted into the jumping fastener.

[0014] Advantages:

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] (1) In the present utility model, the moving contact is tightly pressed on the contact support by the contact torsion spring, thereby avoiding the influence of high temperature on the connection strength between the moving contact and the contact support. At the same time, when the moving contact touches the static contact instantaneously, the contact torsion spring also provides buffering for the moving contact, reducing the reaction force generated by the collision per unit time, enabling the moving contact to repeatedly switch between the closed and open states with the static contact, thereby improving the service life of the moving and static contacts and making the product have the advantage of anti-deformation.

[0017] (2) In the present utility model, by providing the first wiring hole and the second wiring hole, the first wiring hole is mainly electrically connected to the wire, and the second wiring hole is mainly connected to the busbar copper row. Through the improvement of the structure, the product provides multiple wiring methods, which is convenient for users to choose. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of an improved miniature circuit breaker of the present utility model;

[0019] Figure 2 is a schematic internal structure diagram of an improved miniature circuit breaker of the present utility model Figure 1 ;

[0020] Figure 3 is a schematic internal structure diagram of an improved miniature circuit breaker of the present utility model Figure 2 ;

[0021] Figure 4 For the present utility model Figure 3 is a partially enlarged view A of an improved miniature circuit breaker;

[0022] The corresponding relationship between the reference numerals and the component names in the figure is as follows:

[0023] Reference numerals: 1, housing; 2, contact support; 3, moving contact; 4, release member; 5, contact torsion spring; 6, tension spring; 7, bimetallic strip; 8, handle; 9, pull rod;

[0024] 11, pin shaft; 12, support shaft; 13, first wiring hole; 14, second wiring hole; 15, conductive member; 16, fixing member; 17, fastening screw;

[0025] 151, first conductive portion; 152, second conductive portion;

[0026] 21, cavity; 22, first abutting portion; 23, convex column; 24, jump release member; 25, supporting portion;

[0027] 31, second abutting portion; 32, extension portion; 33, contact head portion; 34, engaging groove; 35, connecting portion. Detailed implementation manners

[0028] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0030] In the embodiments of the present utility model, "and / or" only describes the associated relationship of the associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0031] Reference example Figures 1 to 4An improved miniature circuit breaker includes a housing 1, a contact bracket 2, a moving contact 3, and a release member 4. The housing 1 is provided with a pin 11, which passes through the contact bracket 2 and the release member 4, so that the contact bracket 2 and the release member 4 can move in a linked manner. The characteristics are as follows: the contact bracket 2 is provided with a cavity 21 with a notch, the side wall of the cavity 21 is provided with a first contact portion 22, the cavity 21 is provided with a protrusion 23, the moving contact 3 is sleeved on the protrusion 23, one side of the moving contact 3 is provided with a second contact portion 31, the other side of the moving contact 3 is provided with an extension portion 32, the protrusion 23 is provided with a contact torsion spring 5, the contact One end of the torsion spring 5 abuts the first abutting portion 22, and the other end is buckled on the extension portion 32, so that the second abutting portion 31 abuts the side wall of the cavity 21. The movable contact 3 is pressed against the contact bracket 2 by the contact torsion spring 5, thereby preventing high temperature from affecting the connection strength between the movable contact 3 and the contact bracket 2. At the same time, when the movable contact 3 touches the static contact, the contact torsion spring 5 also provides a buffer for the movable contact 3, reducing the reaction force generated by the collision per unit time, so that the movable contact 3 switches back and forth between the closed and disconnected states with the static contact multiple times, thereby improving the service life of the movable and static contacts.

[0032] It is worth mentioning that the housing 1 is further provided with a support shaft 12. A first wiring hole 13 is provided at both ends of the housing 1, and a second wiring hole 14 is provided above the wiring hole. The support shaft 12 provides a support point for the tension spring 6. The first wiring hole 13 and the second wiring hole 14 respectively guide the wires and the busbar to enter, and prevent the user from contacting the conductive member 15.

[0033] It is worth mentioning that the support shaft 12 is provided with a tension spring 6 and is connected to the contact bracket 2, so that the contact bracket 2 is tilted in the direction of the tension spring 6. When the circuit breaker is in the closed state, the tension spring 6 is pulled by the contact bracket 2, so that the tension spring 6 is stretched, and the direction of the tension spring 6 after rotation is consistent with that of the handle 8. At this time, the force of the tension spring 6 and the torsion spring in the handle 8 makes the tripping member 4 fit tightly with the tripping member 24, and the handle 8 is tightly connected to the housing 1, thereby increasing friction and playing a role in preventing accidental tripping;

[0034] It is worth mentioning that a conductive member 15 is provided in the first wiring hole 13. The conductive member 15 has a first conductive portion 151 and is located above the first wiring hole 13. A second conductive portion 152 is provided above the first conductive portion 151 and is located at the bottom of the second wiring hole 14. The first conductive portion 151 is provided with a liftable fixing member 16. The fixing member 16 has a fastening screw 17 and passes through the second conductive portion 152. After the wire is inserted into the first wiring hole 13, the fastening screw 17 is rotated to raise the fixing member 16, pressing the wire against the first conductive portion 151 to complete the electrical connection; the fastening screw 17 is removed, and the busbar is inserted into the second wiring hole 14. As the fastening screw 17 is tightened, the busbar is pressed against the second conductive portion 152. By providing multiple wiring methods, it is convenient for users to choose;

[0035] It is worth mentioning that it also includes a bimetallic strip 7, which is electrically connected to one of the conductive members 15;

[0036] It is worth mentioning that the contact bracket 2 is provided with a tripping member 24, which abuts against the tripping member 4. A supporting portion 25 is provided at the bottom of the first abutting portion 22. The tripping member 24 cooperates with the contact bracket 2 and the tripping member 4 to move in conjunction with each other. The supporting portion 25 prevents the contact torsion spring 5 from separating from the first abutting portion 22 and provides support for it.

[0037] It is worth mentioning that a contact portion 33 is provided on one side of the extension portion 32, and a buckle groove 34 is provided on the extension portion 32. The contact torsion spring 5 is buckled in the buckle groove 34. The movable contact 3 is also provided with a connecting portion 35. The connecting portion 35 is electrically connected to the bimetallic strip 7 through a flexible connecting wire. The buckle groove 34 not only plays a foolproof role, but also prevents the contact torsion spring 5 from being displaced when the contact bracket 2 moves, thereby affecting the force applied by the contact torsion spring 5 to the movable contact 3.

[0038] It is worth mentioning that the housing 1 is provided with a handle 8, the handle 8 is provided with a pull rod 9, and is inserted into the tripping member 24. When the handle 8 is pushed, the force is transmitted to the tripping member 24 through the pull rod 9, driving the tripping member 24 to rotate, and driving the contact 3 bracket 2 and the tripping member 4 to rotate together, so that the moving contact 3 moves toward the static contact in the housing 1.

[0039] The above design scheme can enable the product to achieve the advantages of anti-deformation and multiple wiring methods.

[0040] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. An improved miniature circuit breaker, comprising a housing (1), a contact support (2), a moving contact (3), and a release member (4). The housing (1) is provided with a pin shaft (11), and the pin shaft (11) passes through the contact support (2) and the release member (4) to enable the linkage movement of the contact support (2) and the release member (4). It is characterized in that: The contact support (2) is provided with a cavity (21) with a notch. The side wall of the cavity (21) is provided with a first abutting part (22). The cavity (21) is provided with a convex post (23). The moving contact (3) is sleeved on the convex post (23). One side of the moving contact (3) is provided with a second abutting part (31). The other side of the moving contact (3) is provided with an extension part (32). The convex post (23) is provided with a contact torsion spring (5). One end of the contact torsion spring (5) abuts against the first abutting part (22), and the other end is buckled on the extension part (32), so that the second abutting part (31) abuts against the side wall of the cavity (21).

2. The improved miniature circuit breaker according to claim 1, characterized in that: The housing (1) is further provided with a support shaft (12). The two ends of the housing (1) are provided with first wiring holes (13). Above the wiring holes, there are second wiring holes (14).

3. The improved miniature circuit breaker according to claim 2, wherein: The support shaft (12) is provided with a tension spring (6) and is connected to the contact support (2), so that the contact support (2) inclines in the direction in which the tension spring (6) pulls.

4. The improved miniature circuit breaker according to claim 2, characterized in that: A conductive member (15) is arranged in the first wiring hole (13). The conductive member (15) is provided with a first conductive part (151) and is located above the first wiring hole (13). Above the first conductive part (151), there is a second conductive part (152) and is located at the bottom of the second wiring hole (14). The first conductive part (151) is provided with a liftable fixing member (16). The fixing member (16) is provided with a fastening screw (17) which passes through the second conductive part (152).

5. The improved miniature circuit breaker according to claim 4, characterized in that: It further includes a bimetallic strip (7). The bimetallic strip (7) is electrically connected to one of the conductive members (15).

6. The improved miniature circuit breaker according to claim 1, characterized in that: The contact support (2) is provided with a jump fastener (24) which abuts against the release fastener (4). The bottom of the first abutting part (22) is provided with a supporting part (25).

7. The improved miniature circuit breaker according to claim 6, characterized in that: One side of the extension part (32) is provided with a contact head (33). The extension part (32) is provided with a buckling groove (34). The contact torsion spring (5) is buckled in the buckling groove (34). The moving contact (3) is further provided with a connecting part (35). The connecting part (35) is electrically connected to the bimetallic strip (7) through a flexible connecting wire.

8. The improved miniature circuit breaker according to claim 6, characterized in that: The housing (1) is provided with a handle (8). The handle (8) is provided with a pull rod (9) which is inserted into the jump fastener (24).

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