Small-size molded case circuit breaker

Abstract

The utility model relates to a small-size molded case circuit breaker, which comprises a base, a middle cover, an electronic controller, a surface cover, an operating mechanism, a moving contact, a static contact, a wiring board, an arc extinguishing cover and an electronic release, two cam parts are arranged in the middle cover, accommodating grooves for accommodating auxiliary contacts are formed in the positions, corresponding to the two cam parts, in the middle cover respectively, through holes allowing the cam parts to penetrate through are formed in the accommodating grooves of the middle cover, the two cam parts penetrate through the through holes along with the action of the rotating shaft and trigger the auxiliary contacts, and connection or disconnection of the auxiliary contacts is achieved. The static contact is provided with an arc striking sheet at a position corresponding to the static contact point, and one end of the arc striking sheet is bent and extends into the arc extinguish chamber. The arc extinguishing device has the advantages of simple structure, stable and reliable performance, convenience in assembly, good arc extinguishing effect and small size.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, concretely relates to a small volume moulded case circuit breaker. BACKGROUND

[0002] Moulded case circuit breaker is widely used in industry and agriculture, transportation, mine, civil building and national defense department, plays a big role to power transmission and distribution and motor protection, is the product of large use quantity and wide use surface in low voltage electric appliance, and moulded case circuit breaker is the switching device that can close, carry and open the current under normal circuit condition, and can close, carry and open the current under abnormal circuit condition (including short circuit condition) in the stipulated time, moulded case circuit breaker includes base, upper cover, operating mechanism, movable contact, static contact, arc extinguishing chamber, thermal magnetic release mechanism, the structure design of prior art moulded case circuit breaker is complex, and the volume is big, and internal structure cannot integrate modularization, cannot realize modularization assembly, and assembly is more complicated, and the moulded case circuit breaker still has the defects of unreliable performance and unsatisfactory arc extinguishing effect. SUMMARY

[0003] The utility model discloses a small volume moulded case circuit breaker with simple structure, stable and reliable performance, convenient assembly and good arc extinguishing effect.

[0004] To realize above-mentioned purpose, the utility model discloses a small volume moulded case circuit breaker, including base, the middle cover of setting on the base, the electronic controller of setting in the middle cover, the face cover of setting on the middle cover, operating mechanism, the movable contact of the linkage cooperation with operating mechanism, the static contact with movable contact cooperation, the wiring board of electric connection with movable contact, the arc extinguishing cover of setting on static contact, electronic release, operating mechanism's pivot both ends have two cam parts with auxiliary contact cooperation, the middle cover in two cam parts department respectively sets up the accommodation groove for placing auxiliary contact, the accommodation groove in the middle cover is provided with the through -hole that can pass through cam part, two cam parts pass through through -hole with pivot action and trigger auxiliary contact, realize the on or off of auxiliary contact, the static contact on corresponding static contact point is provided with arc -striking piece, and the arc -striking piece one end bends and extends in arc extinguishing chamber.

[0005] The beneficial effects of the above structure are that the rotating shaft triggers the auxiliary contact through the cam part, so that the rotating shaft can reliably trigger the auxiliary contact, and the working reliability of the molded case circuit breaker is improved, the structure design is simpler and more compact, the molded case circuit breaker can realize the shell capacity increase from 250A to 400A, the volume is smaller, the arc at the static contact point can be quickly introduced into the arc extinguishing chamber by the arc introduction sheet, the arc extinguishing effect is better, and the arc extinguishing chamber and the static contact are integrated and modularized, so that the modularized assembly of the molded case circuit breaker is facilitated, and the assembly is more convenient.

[0006] In particular, the arc introduction sheet has two arc introduction parts symmetrically distributed at the other end, the two arc introduction parts are connected to the static contact, and the two arc introduction parts are distributed on both sides of the static contact point.

[0007] In particular, the cam part is provided with a trigger arc surface matched with the auxiliary contact on one side. The cam part triggers the auxiliary contact through the trigger arc surface, so that the cam part can reliably trigger the auxiliary contact, thereby facilitating the improvement of the working reliability of the molded case circuit breaker.

[0008] In particular, the wiring board is sleeved with a current transformer, the base is provided with a positioning groove corresponding to the current transformer, the current transformer is clamped in the positioning groove, and the clamping cooperation between the current transformer and the base is formed. The current transformer and the wiring board are integrated and modularized, the current transformer is clamped in the positioning groove of the base, so that the modularized assembly of the wiring board, the current transformer and the base is facilitated, and the assembly efficiency is higher.

[0009] In particular, the electronic controller comprises a box body arranged in the base, and a control circuit board arranged in the box body, the middle cover is provided with a button hole corresponding to the button of the control circuit board, and the surface cover is provided with a flip cover covering the button hole. The flip cover covers the button hole, so that the electronic controller is prevented from being exposed outside the middle cover, and the working reliability of the molded case circuit breaker is improved.

[0010] In particular, the flip cover is provided with two rotating shaft parts on one side, the two rotating shaft parts are rotationally arranged in the positioning groove of the surface cover, and the rotating connection between the rotating shaft parts and the surface cover is formed, the flip cover is provided with a clamping block matched with the surface cover on the other side, the surface cover is provided with a clamping groove matched with the clamping block, the clamping block is clamped in the clamping groove, and the clamping connection between the clamping block and the surface cover is formed. The flip cover and the surface cover are assembled in the clamping connection mode, so that the assembly of the flip cover and the surface cover is facilitated, and the assembly is more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is a perspective view of an embodiment of the utility model.

[0012] Fig. 2 This is a cross-sectional view of an embodiment of the present utility model.

[0013] Fig. 3 This is an exploded view of an embodiment of the present utility model. Detailed Implementation

[0014] like Figs. 1-3 As shown, this utility model embodiment is a small-volume molded case circuit breaker, including a base 10, a middle cover 11 disposed on the base 10, an electronic controller 12 disposed within the middle cover 11, a front cover 13 disposed on the middle cover 11, an operating mechanism 14, a moving contact 15 that is linked and cooperates with the operating mechanism 14, a stationary contact 16 that cooperates with the moving contact 15, a terminal block 17 that is electrically connected to the moving contact 15, an arc-extinguishing cover 18 disposed on the stationary contact 16, and an electronic trip unit 19. The operating mechanism 14 has auxiliary terminals at both ends of its rotating shaft 141. Two cam portions 142 that cooperate with the auxiliary contact are provided in the middle cover 11. Receiving grooves 110 for placing the auxiliary contact are respectively provided at the two cam portions 142. The receiving grooves 110 of the middle cover 11 have through holes through which the cam portions 142 can pass. The two cam portions 142 move with the rotating shaft 14, passing through the through holes and triggering the auxiliary contact, thus connecting or disconnecting the auxiliary contact. An arc-inducing plate 20 is provided on the stationary contact 16 at the stationary contact point 161. One end of the arc-inducing plate 20 is bent and extends into the arc-extinguishing chamber 18. The other end of the arc-inducing plate 20 has two symmetrically distributed arc-inducing portions 201, which are connected to the stationary contact 16 and distributed on both sides of the stationary contact point 161. A triggering arc surface 143 that cooperates with the auxiliary contact is provided on one side of the cam portion 142. The cam section triggers the auxiliary contact via a trigger arc surface, ensuring reliable triggering of the auxiliary contact and thus improving the operational reliability of the molded case circuit breaker.

[0015] like Fig. 2 and 3The current transformer 21 is clamped in the positioning groove 101, and the current transformer 21 and the base 10 are clamped and matched. The current transformer and the wiring board are integrated and modularized, the current transformer is clamped in the positioning groove of the base, so that the modularized assembly of the wiring board, the current transformer and the base is facilitated, and the assembly efficiency is higher. The electronic controller 12 comprises a box body 121 arranged in the base 10 and a control circuit board 122 arranged in the box body 121. The middle cover 11 is provided with a button hole 111 corresponding to the button of the control circuit board 122. The surface cover 13 is provided with a flip cover 22 covering the button hole 111. The flip cover covers the button hole, so that the electronic controller is prevented from being exposed outside the middle cover, and the working reliability of the molded case circuit breaker is improved. The flip cover 22 is provided with two rotating shaft parts 221 on one side. The two rotating shaft parts 221 are rotatably arranged in the positioning groove 131 of the surface cover 13 and are rotatably connected and matched with the surface cover 13. The flip cover 22 is provided with a clamping block 222 matched with the surface cover 13 on the other side. The surface cover 13 is provided with a clamping groove 132 matched with the clamping block 222. The clamping block 222 is clamped in the clamping groove 132 and is clamped and matched with the surface cover 13. The flip cover and the surface cover are assembled in a clamping and matching mode, so that the assembly of the flip cover and the surface cover is facilitated and more convenient.

[0016] The rotating shaft triggers the auxiliary contact through the cam part, so that the rotating shaft can reliably trigger the auxiliary contact, and the working reliability of the molded case circuit breaker is improved. The structure design is simpler and more compact. The molded case circuit breaker can realize the shell capacity increase from 250A to 400A, has a smaller volume, the arc at the static contact point can be quickly introduced into the arc extinguishing chamber by the arc leading piece, the arc extinguishing effect is better, and the arc extinguishing chamber and the static contact are integrated and modularized, so that the modularized assembly of the molded case circuit breaker is facilitated and more convenient. Therefore, the molded case circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, good arc extinguishing effect and small volume.

Claims

1. A small volume molded case circuit breaker comprising a base, a middle cover disposed on the base, an electronic controller disposed within the middle cover, a face cover disposed on the middle cover, an operating mechanism, a movable contact in linkage with the operating mechanism, a stationary contact in cooperation with the movable contact, a terminal board electrically connected with the movable contact, an arc chute disposed on the stationary contact, an electronic trip, characterized in that: The rotation shaft of the operating mechanism is provided with two cam parts at both ends for matching with the auxiliary contact, the middle cover is provided with a containing slot for placing the auxiliary contact at the position corresponding to the two cam parts, the containing slot of the middle cover is provided with a through hole for the cam part to pass through, the two cam parts pass through the through hole and trigger the auxiliary contact with the rotation of the rotation shaft, so as to realize the on or off of the auxiliary contact, the static contact is provided with an arc striking piece at the position corresponding to the static contact point, and one end of the arc striking piece is bent and extended in the arc extinguishing chamber.

2. The molded case circuit breaker of claim 1, wherein: The other end of the arc striking piece is provided with two arc striking parts which are symmetrically distributed and connected to the static contact, and the two arc striking parts are distributed on both sides of the static contact point.

3. The molded case circuit breaker of one of claims 1 or 2, wherein: One side of the cam part is provided with a trigger arc surface for matching with the auxiliary contact.

4. The molded case circuit breaker of one of claims 1 or 2, wherein: The terminal board is provided with a current transformer, the base is provided with a positioning slot at the position corresponding to the current transformer, and the current transformer is clamped in the positioning slot to form the clamping connection between the current transformer and the base.

5. The molded case circuit breaker of either claim 1 or 2, wherein: The electronic controller comprises a box body arranged in the base, a control circuit board arranged in the box body, a button hole provided on the middle cover at the position corresponding to the button of the control circuit board, and a flip cover provided on the surface cover and covering the button hole.

6. The molded case circuit breaker of claim 5, wherein: One side of the flip cover is provided with two rotation shaft parts which are rotatably arranged in the positioning slot of the surface cover to form the rotation connection between the rotation shaft part and the surface cover, the other side of the flip cover is provided with a clamping block for matching with the surface cover, the surface cover is provided with a clamping slot for matching with the clamping block, the clamping block is clamped in the clamping slot to form the clamping connection between the clamping block and the surface cover.

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