Circuit breaker with enhanced insulation effect

Abstract

The utility model relates to a circuit breaker, in particular to a circuit breaker with a reinforced insulation effect, which comprises an arc extinguish chamber shell, a copper bar arranged on the outer side of the arc extinguish chamber shell, and a cover body fixedly assembled with the arc extinguish chamber shell and partially covering the copper bar, according to the utility model, the connection part of the wire inlet end of the product and the wiring terminal is wrapped by the plastic insulating cover body, and the arc baffle plate with a coherent structure is arranged in the cover body, so that free electric arc falling on the copper plate at the upper part is reduced to the maximum extent, and the electric arc is prevented from falling on the copper plate at the lower part. The utility model has the advantages of simple structure, convenient processing, easy assembly and strong practicability, can prevent the screw and the copper bar from being oxidized and corroded when the product is used in salt mist, damp and hot sites, and improves the protection grade of the product.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, in particular to a circuit breaker with enhanced insulation effect. Background Art

[0002] Ordinary circuit breakers are equipped with an arc extinguishing chamber. Although the arc extinguishing chamber can handle most of the arcs, there will still be free arcs that are not handled. Therefore, an insulating cover is set on one side of the arc extinguishing chamber. There is a copper busbar running through the insulating cover. The free arc can easily fall on the copper busbar, which can easily cause an external short circuit of the product, a short circuit to the ground or between phases. The insulation between phases and between phases and ground of the product is very important. For example, the patent with application number 02142955.3 and the name of "Circuit Breaker and Method for Interrupting Current Therein" has no treatment in the insulating cover and on the upper part of the copper busbar of some circuit breakers on the market, or only a baffle structure is made at the screw to prevent the arc from falling on the copper busbar. This type of circuit breaker is difficult to apply to high-voltage circuit breaker products. How to enhance the insulation effect is the technical problem we need to solve now. Utility Model Content

[0003] In view of the deficiencies of the existing technology, the utility model provides a circuit breaker with enhanced insulation effect.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a circuit breaker with enhanced insulation effect, including an arc extinguishing chamber shell, a copper busbar is installed on the outside of the arc extinguishing chamber shell, and is characterized in that it includes a cover body fixedly assembled with the arc extinguishing chamber shell and partially covering the copper busbar, and an insulating arc-blocking plate covering the entire range of the copper busbar in the cover body is provided inside the cover body and relative to the top of the copper busbar.

[0005] First limiting grooves are arranged on both sides of the inner wall of the cover body, and wing plates matching the first limiting grooves are arranged on both sides of the insulating arc blocking plate. The insulating arc blocking plate is inserted into the first limiting groove through the wing plates to achieve fixed limiting.

[0006] The copper bar is fixed to the outer side of the arc extinguishing chamber shell by a fastener, and a bending portion bent downward is provided at the head of the insulating arc baffle plate relative to the position of the fastener.

[0007] The tail of the insulating arc baffle plate is provided with an elastic arm to prevent the insulating arc baffle plate from escaping from the first limiting groove, and a slot matching the elastic arm is provided on the cover body at a position corresponding to the elastic arm. The insulating arc baffle plate and the cover body are fixed and limited by the cooperation of the elastic arm and the slot.

[0008] The elastic arm is provided with a guide surface for facilitating the clamping connection between the insulating arc baffle plate and the cover body.

[0009] A baffle plate perpendicular to the insulating arc blocking plate is arranged above the insulating arc blocking plate, and a plurality of through holes for cooperating in eliminating free arcs are arranged on the baffle plate.

[0010] Second limiting grooves are arranged on both sides of the inner wall of the cover body, and the baffle plate is limited by being inserted into the second limiting grooves.

[0011] The cover body is provided with a plurality of holes.

[0012] The cover body is provided with a flange, and the arc extinguishing chamber shell is provided with a third limiting groove matching the flange, and the cover body is limited by inserting the flange into the third limiting groove.

[0013] The flange is provided with a stopper portion for preventing the flange from being separated from the third limiting groove in a direction perpendicular to the third limiting groove.

[0014] The beneficial effects of the utility model are as follows: the utility model wraps the connection between the product incoming line end and the wiring terminal with a plastic insulating cover, and an arc-blocking plate with a continuous structure is arranged in the cover, which can reduce the free arc above and fall onto the copper plate to the greatest extent, inhibit arc burning, and achieve insulation. At the same time, it can avoid oxidation and corrosion of screws and copper bars caused by the use of the product in salt spray, humid and hot sites, thereby improving the protection level of the product. The utility model also has the characteristics of simple structure, convenient processing and easy assembly, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a structural exploded diagram of the utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 It is a cross-sectional view of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the insulating arc-blocking plate of the utility model;

[0020] Figure 6 It is a cross-sectional view of the cover body of the utility model. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 6 As shown, a circuit breaker with enhanced insulation effect includes an arc extinguishing chamber housing 100, a copper bar 110 is installed on the outer side of the arc extinguishing chamber housing 100, and a cover body 200 is fixedly assembled with the arc extinguishing chamber housing 100 and partially covers the copper bar 110. An insulating arc blocking plate 300 is arranged inside the cover body 200 and above the copper bar 110 to cover the entire range of the copper bar 110 in the cover body 200. The "above" here refers to the Figure 1 and 4Taking the direction in as a reference, the copper busbar 110 is connected from the arc extinguishing chamber housing 100, and the copper busbar 110 is arranged in multiple rows.

[0022] The first limiting grooves 210 are provided on both sides of the inner wall of the cover body 200, and the wing plates 310 cooperating with the first limiting grooves 210 are provided on both sides of the insulating arc blocking plate 300. The insulating arc blocking plate 300 is inserted into the first limiting grooves 210 through the wing plates 310 to achieve fixed limiting. The insulating arc blocking plate 300 is conveniently loaded and unloaded by means of plug-in connection.

[0023] The copper busbar 110 is fixed to the outer side of the arc extinguishing chamber shell 100 by means of a fastener 111. A downwardly bent portion 320 is provided at the head of the insulating arc baffle plate 300 relative to the position of the fastener 111. An insulating paper sheet 260 is generally provided inside the cover body 200 relative to the position close to the fastener 111. The bending portion 320 is added to prevent the lower part of the insulating paper sheet 260 from being blown away and the upper part from being blown away by the hot air flow of the arc spray inside the circuit breaker.

[0024] The tail of the insulating arc baffle plate 300 is provided with an elastic arm 330 to prevent the insulating arc baffle plate 300 from escaping from the first limiting groove 210, and a slot 220 matching the elastic arm 330 is provided on the cover body 200 and at a position corresponding to the elastic arm 330. The insulating arc baffle plate 300 and the cover body 200 are fixed and limited by the cooperation of the elastic arm 330 and the slot 220 in a snap-fit ​​manner.

[0025] The elastic arm 330 is provided with a guide surface 331 for conveniently snapping the insulating arc baffle plate 300 and the cover body 200. The guide surface 331 is added to facilitate the installation of the insulating arc baffle plate 300. During installation, the guide surface 331 causes the elastic arms 330 on both sides to deform and move toward each other. After the elastic arm 330 is snapped into the slot 220, the elastic arm 330 returns to the initial state under its own elastic restoring force to achieve snapping.

[0026] A baffle plate 400 is disposed above the insulating arc baffle plate 300 and is perpendicular to the insulating arc baffle plate 300. The baffle plate 400 is provided with a plurality of through holes 410 for cooperating in eliminating the free arc. Figure 1 and 4 Taking the direction in as a reference, the baffle 400 is made of metal and the through hole 410 can eliminate the free arc, which is highly practical.

[0027] Second limiting grooves 230 are provided on both sides of the inner wall of the cover body 200 , and the baffle plate 400 is limited by being inserted into the second limiting grooves 230 . The baffle plate 400 is limited in the cover body 200 by the second limiting grooves 230 .

[0028] The cover body 200 is provided with a plurality of holes 240 , and the arrangement of the holes 240 allows the excess free arc to be discharged, which is highly practical.

[0029] The cover body 200 is provided with a flange 250, and the arc extinguishing chamber shell 100 is provided with a third limiting groove 120 that matches the flange 250. The cover body 200 is limited by inserting the flange 250 into the third limiting groove 120. The cover body 200 and the arc extinguishing chamber shell 100 are also fixed and assembled by screws. The addition of the flange 250 and the third limiting groove 120 provides a positioning guide when the cover body 200 and the arc extinguishing chamber shell 100 are assembled, and also improves the stability of the connection between the cover body 200 and the arc extinguishing chamber shell 100.

[0030] The flange 250 is provided with a stopper 251 to prevent the flange 250 from escaping from the third limiting groove 120 in a direction perpendicular to the third limiting groove 120. The stopper 251 is added to prevent the cover body 200 from being removed laterally. The cross-section of the third limiting groove 120 can be designed as a convex structure as shown in the attached figure.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, simple changes and substitutions by ordinary technicians in this field are within the protection scope of the utility model.

Claims

1. A circuit breaker with enhanced insulation effect, comprising an arc extinguishing chamber housing (100), wherein a copper busbar (110) is installed on the outer side of the arc extinguishing chamber housing (100), characterized in that: It comprises a cover body (200) fixedly assembled with an arc extinguishing chamber housing (100) and partially covering a copper bar (110); an insulating arc blocking plate (300) is provided inside the cover body (200) and above the copper bar (110) to cover the entire range of the copper bar (110) inside the cover body (200).

2. A circuit breaker with enhanced insulation effect as claimed in claim 1, characterized in that: First limiting grooves (210) are provided on both sides of the inner wall of the cover body (200), wing plates (310) matching the first limiting grooves (210) are provided on both sides of the insulating arc blocking plate (300), and the insulating arc blocking plate (300) is inserted into the first limiting grooves (210) through the wing plates (310) to achieve fixed limiting.

3. A circuit breaker with enhanced insulation effect as claimed in claim 2, characterized in that: The copper busbar (110) is fixed to the outside of the arc extinguishing chamber housing (100) via a fastener (111), and a bent portion (320) bent downward is provided at the head of the insulating arc baffle plate (300) at a position relative to the fastener (111).

4. A circuit breaker with enhanced insulation effect as claimed in claim 3, characterized in that: The rear portion of the insulating arc-blocking plate (300) is provided with an elastic arm (330) for preventing the insulating arc-blocking plate (300) from being separated from the first limiting groove (210); a clamping groove (220) for matching the elastic arm (330) is provided on the cover body (200) at a position corresponding to the elastic arm (330); the insulating arc-blocking plate (300) and the cover body (200) are fixed and limited in position by the cooperation of the elastic arm (330) and the clamping groove (220) in a clamping manner.

5. A circuit breaker with enhanced insulation effect as claimed in claim 4, characterized in that: The elastic arm (330) is provided with a guide surface (331) for facilitating the clamping connection between the insulating arc blocking plate (300) and the cover body (200).

6. A circuit breaker with enhanced insulation effect as claimed in any one of claims 1 to 5, characterized in that: A baffle plate (400) perpendicular to the insulating arc baffle plate (300) is provided above the insulating arc baffle plate (300), and a plurality of through holes (410) for cooperating in eliminating free arcs are provided on the baffle plate (400).

7. A circuit breaker with enhanced insulation effect as claimed in claim 6, characterized in that: Second limiting grooves (230) are provided on both sides of the inner wall of the cover body (200), and the baffle (400) is limited by being inserted into the second limiting grooves (230).

8. A circuit breaker with enhanced insulation effect as claimed in claim 6, characterized in that: The cover body (200) is provided with a plurality of holes (240).

9. A circuit breaker with enhanced insulation effect as claimed in claim 6, characterized in that: The cover body (200) is provided with a flange (250), the arc extinguishing chamber housing (100) is provided with a third limiting groove (120) matching the flange (250), and the cover body (200) is limited by inserting the flange (250) into the third limiting groove (120).

10. A circuit breaker with enhanced insulation effect as claimed in claim 9, characterized in that: The flange (250) is provided with a stopper (251) for preventing the flange (250) from escaping from the third limiting groove (120) in a direction perpendicular to the third limiting groove (120).

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