Molded case circuit breaker

Abstract

Provided is a molded case circuit breaker. The problem that an existing molded case circuit breaker is poor in universality is solved. The device comprises a base, mounting steps and partition plates are arranged on the base, and the space in the base is divided into a plurality of containing cavities by the partition plates; the static contact piece is arranged in the accommodating cavity of the base; the static contact piece comprises a mounting part and a conductive part which is matched with the movable contact piece and is used for conducting electricity, and the conductive part is bent and obliquely arranged; the static contact piece is detachably connected with the base through the mounting part; and the contact frame is arranged on the outer side of the static contact piece and is detachably connected with the base. The beneficial effects of the utility model are that the static contact piece is detachably connected with the base, and different static contact pieces can be replaced according to needs, so that the product can meet the requirement of low-cost design, can be rapidly replaced when high breaking performance is needed, meets the requirements of customers, and is high in product adaptability, good in product universality, few in parts and convenient to use. And the production cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to a plastic case circuit breaker, in particular to a plastic case circuit breaker. Background Art

[0002] A plastic case circuit breaker mainly consists of a contact arc extinguishing system, a contact system, an operating mechanism and a release. The function of the release is to monitor the current and voltage operation data of the main circuit, set a certain threshold value according to national standards, and form the tripping performance of a specific protection curve. When an overload or short - circuit fault occurs in the circuit, the release realizes the protection of the plastic case circuit breaker against overload or short - circuit faults through thermal effect or magnetic effect.

[0003] The existing contact system usually includes a static contact piece and a moving contact piece, and realizes the conduction or disconnection of the circuit through the movement of the moving contact piece. In the actual production process, it is necessary to consider the production cost and the breaking performance of the product. Different working environments have different requirements for the breaking performance of the circuit breaker. Therefore, the common practice of existing manufacturers is to set up multiple circuit breakers to adapt to different working conditions. For different circuit breakers, their components are usually not interchangeable, and the structural differences are large. In this way, when using, selecting a circuit breaker with appropriate breaking performance can meet the requirements and reduce the cost during use. However, from the perspective of actual production, due to poor product adaptability, increased components, non - interchangeability, the need for multiple mold openings, difficult assembly, and easy waste of parts, the production cost increases significantly. Summary of the Utility Model

[0004] To solve the problem of poor interchangeability of the existing plastic case circuit breaker in the background art, the utility model provides a plastic case circuit breaker.

[0005] The technical solution of the utility model is: a plastic case circuit breaker, including a base, on which there are installation steps and partitions. The partitions divide the space inside the base into multiple accommodation cavities; it also includes:

[0006] A static contact piece, arranged in the accommodation cavity of the base; the static contact piece includes an installation part and a conductive part that cooperates with the moving contact piece for conducting electricity. The conductive part is bent and obliquely arranged; the static contact piece is detachably connected to the base through the installation part;

[0007] A contact holder, arranged outside the static contact piece and detachably connected to the base.

[0008] As a further improvement of the utility model, it also includes a support block, arranged at the bottom of the accommodation cavity. The support block is arranged below the conductive part and supports the conductive part. There is a relief through - hole on the static contact piece.

[0009] As a further improvement of the utility model, it also includes a magnetic enhancement sheet, arranged below the static contact piece, used to enhance magnetism and improve the breaking performance.

[0010] As a further improvement of the present utility model, it further includes a support block, which is arranged below the conductive part; a support groove is provided on the support block, the magnetic enhancement sheet is inserted into the support groove, and the support groove is obliquely arranged.

[0011] As a further improvement of the present utility model, a slot is provided on the contact holder, and pins are provided on the magnetic enhancement sheet and inserted into the slot.

[0012] As a further improvement of the present utility model, a groove and a notch are provided on the contact holder, a static contact piece is provided with a static contact head, the groove wraps around the conductive part of the static contact piece and exposes the static contact head, and the static contact head is exposed from the notch for easy contact with the moving contact piece.

[0013] As a further improvement of the present utility model, a relief through hole is provided on the static contact piece, a convex block and a bending part are provided on the contact holder, the convex block is inserted into the relief through hole and used for limiting the contact holder, and the bending part covers the static contact piece and extends towards the installation part.

[0014] As a further improvement of the present utility model, a clamping groove is provided on the inner wall of the accommodation cavity, and a clamping block adapted to the clamping groove is provided on the contact holder.

[0015] As a further improvement of the present utility model, it further includes an arc extinguishing chamber, which is arranged in the accommodation cavity of the base. The arc extinguishing chamber includes a plurality of arc extinguishing grid sheets, and arc extinguishing grooves are provided on the arc extinguishing grid sheets. The arc extinguishing grooves of adjacent two arc extinguishing grid sheets are arranged in a staggered manner.

[0016] As a further improvement of the present utility model, it further includes an arc initiating sheet, which is arranged on the arc extinguishing grid sheet at the bottom of the arc extinguishing chamber, and the arc initiating sheet is obliquely arranged and faces the conductive part.

[0017] The beneficial effects of the present utility model are that the static contact piece and the base are detachably connected, and different static contact pieces can be replaced according to needs, so that the product can meet the requirements of low-cost design, and can also be quickly replaced when high breaking performance is required, meeting customer needs, making the product highly adaptable, with good compatibility, few components, and greatly reducing the production cost. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0019] Attached Figure 2 is a schematic cross-sectional structural diagram of an embodiment of the present utility model.

[0020] Attached Figure 3 is an exploded structural diagram of an embodiment of the present utility model.

[0021] Appended Figure 4 is a schematic diagram of the explosion structure at the static contact piece in the embodiment of the present utility model.

[0022] Appended Figure 5 is a schematic diagram of the structure of the contact holder in the embodiment of the present utility model.

[0023] In the figure, 1 is the base; 11 is the installation step; 12 is the partition; 13 is the accommodation cavity; 131 is the card slot; 14 is the support block; 141 is the support groove; 2 is the static contact piece; 21 is the installation part; 22 is the conductive part; 23 is the relief through hole; 24 is the static contact; 3 is the contact holder; 31 is the slot; 32 is the groove; 33 is the notch; 34 is the convex block; 35 is the bending part; 36 is the clamping block; 4 is the magnetic enhancement piece; 41 is the pin; 5 is the arc extinguishing chamber; 51 is the arc extinguishing grid piece; 511 is the arc extinguishing groove; 512 is the arc leading piece. Specific Embodiments

[0024] The following further describes the embodiments of the present utility model with reference to the accompanying drawings:

[0025] As Figure 1 shown in combination with Figures 2 - 5 a molded case circuit breaker includes a base 1, and the base 1 is provided with an installation step 11 and a partition 12, and the partition 12 divides the space inside the base 1 into multiple accommodation cavities 13; further includes:

[0026] A static contact piece 2 is arranged in the accommodation cavity 13 of the base 1; the static contact piece 2 includes an installation part 21 and a conductive part 22 that cooperates with the moving contact piece for conduction, and the conductive part 22 is bent and obliquely arranged; the static contact piece 2 is detachably connected to the base 1 through the installation part 21;

[0027] A contact holder 3 is arranged outside the static contact piece 2 and is detachably connected to the base 1. The beneficial effects of the present utility model are that the static contact piece and the base are detachably connected, and different static contact pieces can be replaced according to needs, so that the product can meet the requirements of low-cost design, and can also be quickly replaced when high breaking performance is required, meeting customer needs, making the product highly adaptable, having good compatibility, few components, and greatly reducing production costs. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0028] The present utility model further includes a support block 14 arranged at the bottom of the accommodation cavity 13, the support block 14 is arranged below the conductive part 22 and supports the conductive part 22, and the static contact piece 2 is provided with a relief through hole 23. Specifically, two different static contact pieces are disclosed in the present utility model, see Appended Figure 3, wherein the static contact piece disposed in the middle accommodating cavity can be directly placed on the support block, and the support block supports the conductive part. A magnetic enhancement piece can be arranged at the bottom of the static contact piece disposed in the side accommodating cavity. The support block is arranged to maintain the height of the static contact head on the conductive part, facilitating reliable contact with the moving contact head to achieve circuit conduction. That is, the two types of static contact pieces can be replaced and substituted, so that according to different actual working conditions and breaking performance requirements, similar static contact pieces can be selected, reducing production costs and usage costs.

[0029] The utility model further includes a magnetic enhancement piece 4, which is disposed below the static contact piece 2 and is used to enhance magnetism to improve the breaking performance. Specifically, the utility model further includes a support block 14, which is disposed below the conductive part 22; a support groove 141 is provided on the support block 14, and the magnetic enhancement piece 4 is inserted into the support groove 141, and the support groove 141 is obliquely arranged. The arrangement of the magnetic enhancement piece can increase the magnetic field intensity, facilitating magnetic blowout, arc ignition and arc extinction. Usually, the contact holder is integrally formed with a gas-generating material.

[0030] A slot 31 is provided on the contact holder 3, and a pin 41 inserted into the slot 31 is provided on the magnetic enhancement piece 4. Such a structure facilitates the limiting of the magnetic enhancement piece, has a simple structure and is convenient for installation. Usually, the magnetic enhancement piece can be fixed on the contact holder, and usually, the contact holder can be integrally formed with a gas-generating material.

[0031] A groove 32 and a notch 33 are provided on the contact holder 3, a static contact head 24 is provided on the static contact piece 2, the groove 32 covers the conductive part 22 of the static contact piece 2 and exposes the static contact head 24, and the static contact head 24 is exposed from the notch 33 to facilitate contact with the moving contact piece. Specifically, a relief through hole 23 is provided on the static contact piece 2, a convex block 34 and a bent part 35 are provided on the contact holder 3, the convex block 34 is inserted into the relief through hole 23 and is used for limiting the contact holder 3, and the bent part 35 covers the static contact piece 2 and extends towards the mounting part 21. Such a structure can limit the static contact piece, has a simple structure, avoids shaking, and ensures the distance from the moving contact piece to the static contact piece.

[0032] A clamping groove 131 is provided on the inner wall of the accommodating cavity 13, and a clamping block 36 adapted to the clamping groove 131 is provided on the contact holder 3. Such a structure facilitates the installation and limiting of the contact holder, has a simple structure, is convenient for quick disassembly and assembly, and is convenient for replacing the static contact piece.

[0033] The utility model further includes an arc extinguishing chamber 5, which is arranged in the accommodating cavity 13 of the base 1. The arc extinguishing chamber 5 includes a plurality of arc extinguishing grid plates 51, and arc extinguishing grooves 511 are arranged on the arc extinguishing grid plates 51. The arc extinguishing grooves 511 of two adjacent arc extinguishing grid plates 51 are arranged in a staggered manner. Specifically, the utility model further includes an arc ignition piece 512, which is arranged on the arc extinguishing grid plate 51 at the bottommost part of the arc extinguishing chamber 5, and the arc ignition piece 512 is arranged obliquely and towards the conductive part 22. Such a structure facilitates rapid arc ignition and arc extinction, and has a simple structure.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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 cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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 specific situations. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0036] All technicians should note that although the present utility model has been described according to the above specific embodiments, the inventive concept of the present utility model is not limited to this utility model only. Any modification using the inventive concept of the present utility model will be included in the protection scope of the patent right of the present utility model.

Claims

1. A molded case circuit breaker, comprising a base (1), wherein the base (1) is provided with a mounting step (11) and a partition (12), wherein the partition (12) divides the space inside the base (1) into a plurality of accommodating chambers (13); characterized in that Also included: A stationary contact piece (2) is arranged in a receiving cavity (13) of the base (1); the stationary contact piece (2) comprises a mounting portion (21) and a conductive portion (22) for conducting electricity in cooperation with the moving contact piece, the conductive portion (22) being bent and arranged obliquely; the stationary contact piece (2) is detachably connected to the base (1) via the mounting portion (21); The contact frame (3) is arranged on the outer side of the stationary contact piece (2) and is detachably connected to the base (1).

2. A molded case circuit breaker according to claim 1, characterized in that It also includes a support block (14) disposed at the bottom of the accommodating cavity (13), the support block (14) being disposed below the conductive part (22) and supporting the conductive part (22), and a clearance through hole (23) being provided on the static contact piece (2).

3. A molded case circuit breaker according to claim 1, characterized in that It also includes a magnetizing sheet (4) which is arranged below the stationary contact sheet (2) and is used to enhance magnetism and improve breaking performance.

4. A molded case circuit breaker according to claim 3, characterized in that It also comprises a support block (14) disposed below the conductive portion (22); the support block (14) is provided with a support groove (141), the magnetizing sheet (4) is inserted into the support groove (141), and the support groove (141) is disposed obliquely.

5. A molded case circuit breaker according to claim 3, characterized in that The contact frame (3) is provided with a slot (31), and the magnetizing sheet (4) is provided with a pin (41) inserted into the slot (31).

6. A molded case circuit breaker according to claim 2, characterized in that The contact frame (3) is provided with a groove (32) and a notch (33); the stationary contact piece (2) is provided with a stationary contact (24); the groove (32) covers the conductive portion (22) of the stationary contact piece (2) and exposes the stationary contact (24); the stationary contact (24) is exposed from the notch (33) to facilitate contact with the moving contact piece.

7. A molded case circuit breaker according to claim 1, characterized in that The stationary contact piece (2) is provided with a clearance through hole (23), and the contact frame (3) is provided with a protrusion (34) and a bending portion (35). The protrusion (34) is inserted into the clearance through hole (23) and is used to limit the contact frame (3), and the bending portion (35) is placed on the stationary contact piece (2) and extends toward the mounting portion (21).

8. The molded case circuit breaker according to claim 1, characterized in that A card slot (131) is provided on the inner wall of the accommodating cavity (13), and a card block (36) matching the card slot (131) is provided on the contact frame (3).

9. The molded case circuit breaker according to claim 1, characterized in that It also comprises an arc extinguishing chamber (5) disposed in the accommodating cavity (13) of the base (1), the arc extinguishing chamber (5) comprising a plurality of arc extinguishing grids (51), arc extinguishing grooves (511) being provided on the arc extinguishing grids (51), and the arc extinguishing grooves (511) of two adjacent arc extinguishing grids (51) being staggered.

10. A molded case circuit breaker according to claim 9, characterized in that It also comprises an arc-starting piece (512) which is arranged on the arc-extinguishing grid piece (51) at the bottom of the arc-extinguishing chamber (5), wherein the arc-starting piece (512) is arranged obliquely and toward the conductive portion (22).

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