CN104871282A

CN104871282A - Circuit breaker

Info

Publication number: CN104871282A
Application number: CN201280077687.8A
Authority: CN
Inventors: 仁科健一; 泷川雄介
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2012-12-12
Filing date: 2012-12-12
Publication date: 2015-08-26
Anticipated expiration: 2032-12-12
Also published as: CN104871282B; JP5840307B2; WO2014091573A1; JPWO2014091573A1

Abstract

The invention provides a circuit breaker, in this circuit breaker, which is provided with an auxiliary cover that is coupled to a main cover via a hinge provided at the edge of a pocket that contains an ancillary device for a breaker mechanism, said hinge comprises the following: a plurality of bearings that protrude from the main cover and contain elongated holes that extend in the direction of the short side of the circuit breaker; notches, cut into the edge of the auxiliary cover at prescribed intervals, into which the respective bearings are inserted; pins that are provided in some of said notches and extend in the same direction as the elongated holes; and a thin section that forms part of the auxiliary cover.

Description

Circuit-breaker

Technical field

The present invention relates to a kind of circuit-breaker, this circuit-breaker has the cavity portion of accommodating various auxiliary equipments such as alarm contact, auxiliary switch, testing apparatus, tripgears, particularly relate to a kind of improvement of hinge part, the assist shroud covering above-mentioned cavity portion pivotally links with main cover by this hinge part.

Background technology

The pedestal that existing circuit-breaker is formed by synthetic resin material and main cover are formed, and are formed with the cavity portion of the incorporating section as the auxiliary equipment such as alarm contact or auxiliary switch in main cover.And, exist be used in a manual manner to the disconnecting mechanism be accommodated in this Shell of circuit breaker carry out opening and closing handle and for making this handle be protruding to handle set outside above-mentioned housing, having such as can the assist shroud of opening and closing when above-mentioned auxiliary equipment being mounted to cavity portion, and above-mentioned assist shroud is by the bearing portion that is formed on main cover and be formed in the pin in assist shroud and form the hinge structure that can rotate.In addition, when closing assist shroud, by hold-down screw, being formed and covering with main the structure (with reference to patent documentation 1) engaged.

Patent documentation 1: No. 6-124638, Japanese Unexamined Patent Publication

Summary of the invention

In above-mentioned existing circuit-breaker, if this big current of flowing short circuit current, as is known, can trip operation be carried out, between contact, produce electric arc.If the gas produced by this electric arc is full of circuit breaker internal, then the higher pressure produced by arcing gas is simultaneously also to the cavity portion transmission that auxiliary equipment is received, and therefore, assist shroud can be damaged sometimes, and auxiliary equipment is deviate to the outside of circuit-breaker.

Namely, in existing structure, for the hinge structure for linking main cover and assist shroud, when the assist shroud of circuit-breaker is arranged on main cover, the direction of insertion of pin becomes side or handle (central authorities) direction, easily enter to make not interfere, therefore, there is not the structure making to die down from handle towards the pressure in sideways direction, in the direction contrary with this pressure, assist shroud is resetted, therefore, when assist shroud becomes the compression body of arcing gas, the pin of hinge structure can come off from bearing sometimes.Therefore, the countermeasure of the quantity needing increase mounting screw or the pressure making the thickening this reply arcing gas of the wall of cover material.

The present invention proposes to solve the problem a little, it is improved the linking part of main cover and assist shroud and hinge structure, make in the circuit-breaker cavity being accommodated with auxiliary equipment covered by assist shroud, the assembleability of assist shroud is excellent, and, when this big current of the short circuit current that flows, even if the higher internal pressure that the electric arc being subject to producing between contact causes, assist shroud also can not be dispersed in breakage.

Circuit-breaker involved in the present invention has Shell of circuit breaker, and it is made up of pedestal and fixing main cover on the base, and disconnecting mechanism is accommodated in inside; Cavity portion, its be formed in described main cover with the surface of described pedestal opposite side, accommodate the auxiliary equipment of described disconnecting mechanism; And assist shroud, it is connected with described main cover via the hinge part being arranged on described cavity portion ora terminalis, cover described cavity portion, the feature of this circuit-breaker is, described hinge part is made up of following parts: multiple bearing portion, they protrude from described main cover across predetermined distance each other and arrange, and have the elongated hole extended from the handle of circuit breaker to side surface direction in inside; Notch, its across predetermined distance described assist shroud ora terminalis depression arrange, with described bearing portion in conjunction with time, for inserting respective bearing portion; Pin, its protrusion is arranged in the part in described notch, extends in the same direction with described elongated hole; And thinner wall section, it is formed in a part for described assist shroud.

The effect of invention

According to the present invention, a kind of circuit-breaker is provided, in this circuit-breaker, the pin shaped of the assist shroud inserted to the bearing portion of main cover becomes and extends towards side surface direction from the handle (central authorities) of circuit breaker, therefore, assist shroud becomes and is difficult to slip and extracts, even if the higher pressure that the arcing gas being subject to producing between contact when flowing side this big current of short circuit current causes, also without the need to making cover material be formed as heavy wall, or increase the quantity of the hold-down screw of assist shroud, can prevent the breakage of assist shroud from dispersing, improve break arc gas resistance to pressure.

Accompanying drawing explanation

Fig. 1 is the outward appearance oblique view of the circuit-breaker represented involved by one embodiment of the present of invention.

Fig. 2 is the outward appearance oblique view representing the state after the left pole assist shroud of one of the assist shroud of the circuit-breaker of Fig. 1 being opened.

Fig. 3 (a) is the front view of left pole assist shroud, and (b) is the figure seen from the arrow D direction of (a) figure.

Fig. 4 is the oblique view of this left pole assist shroud.

Fig. 5 is the profile of the hinge structure of the circuit-breaker represented involved by one embodiment of the present of invention.

Fig. 6 is the front view of the circuit-breaker involved by one embodiment of the present of invention.

Fig. 7 is the front view of the circuit-breaker representing another embodiment of the present invention.

Fig. 8 is the front view of the circuit-breaker representing another embodiment of the present invention.

Embodiment

Execution mode 1.

Use shown Fig. 1 ~ Fig. 6, one embodiment of the present of invention are described.

First, use Fig. 1, Fig. 2, the circuit-breaker as object of the present invention is described.In the drawings, circuit-breaker 100 is made up of following parts: Shell of circuit breaker 1, and it is made up of the pedestal 1a utilizing synthetic resin material to be formed and the main cover 1b be fixed on detachably on this pedestal 1a, by the storage of not shown disconnecting mechanism therein; Handle 3, it is formed by synthetic resin identically with above-mentioned Shell of circuit breaker 1, for operating from outside disconnecting mechanism; Handle set 4, it is arranged on main cover 1b to make this handle 3 be protruding to the outside of Shell of circuit breaker 1; Right pole assist shroud 2a and left pole assist shroud 2b, they are linked with the main 1b of cover rotationally by hinge part 5.

In addition, on the surface of main cover 1b, in the both sides of handle set 4 of substantially central portion being positioned at circuit-breaker, being formed with the cavity portion 6 for accommodating auxiliary equipment respectively, in this cavity portion 6, receiving the auxiliary equipments such as not shown alarm contact, auxiliary switch.Right pole assist shroud 2a and the left pole assist shroud 2b of the upper setting alongside one another in the circuit direction (long side direction of Fig. 1) of breaker body are formed by synthetic resin respectively, with the hinge part 5 in the upper formation of the side surface direction (short side direction of Fig. 1) of breaker body for fulcrum, the auxiliary equipment cavity portion 6 of inside is opened and closed.

As shown in Figure 3, Figure 4, for two assist shroud 2a, 2b (only illustrating left pole assist shroud 2b in the drawings), at their end edge portion, otch 10a, 10b of caving in across predetermined distance each other and arranging are set, at the inner surface of this otch 10a, 10b, there is pin 7a, 7b that the side surface direction (short side direction) to breaker body protrudes, further, in a part of the otch 10 of above-mentioned assist shroud 2a, 2b, 10b, thinner wall section 8a, 8b is formed with.In addition, thinner wall section 8c is formed with at the end edge portion in handle (central authorities) direction of assist shroud 2b.Above-mentioned thinner wall section 8a, 8b are set to a part of otch 10a, 10b of being formed on two assist shroud 2a, 2b to cover, and have the such as thickness bending upward along with the insertion of the lug boss of main cover 1b described later.Similarly, thinner wall section 8c is also formed as having the thickness bending upward along with right side assist shroud 2a when the insertion of the lug boss of main cover 1b.In addition, in above-mentioned assist shroud 2a, 2b, observed by from Fig. 4, be formed in the internal face 9 abutted with the side of handle set 4 when closing assist shroud.This assist shroud 2a, 2b can be detachably arranged on main cover 1b by hinge structure 5.

By Fig. 5, the details of the installation utilizing hinge structure 5 to carry out of two assist shroud 2a, 2b are described.Fig. 5 (a), (b) represent the c-c line section along Fig. 1 partly, Fig. 5 (a) represents the initial insert state of main cover 1b and assist shroud 2b, Fig. 5 (b) represents makes assist shroud 2b slide from this state to A direction (left direction of figure), and this pin 7a, 7b are fitted together to completely to the state in elongated hole 4a, 4b of bearing portion 11a, 11b.Namely, at the ora terminalis of the load-side end side of main cover 1b, to protrude bearing portion 11a, 11b of being provided with as shown in Fig. 5 (a) across the mode of predetermined distance d, this bearing portion 11a, 11b have elongated hole 4a, 4b towards the side surface direction of breaker body (short side direction) in inside, this elongated hole 4a, 4b and above-mentioned pin 7a, 7b are arranged opposite in same axis.

For chimeric method, by assist shroud 2b and main bearing portion 11a, 11b covering 1b in conjunction with time, first, above-mentioned bearing portion 11a, 11b are inserted the position that there is not pin 7a, 7b in notch 10a, 10b of above-mentioned assist shroud 2b, thinner wall section 8a, 8b, 8c of making to be formed in this position abut with the end face of bearing portion 11a, 11b and assist shroud 2a and bend.Bent by this, pin 7a, 7b are relative with the position of elongated hole 4a, 4b, in this condition, if make assist shroud 2b slide to horizontal, the arrow A direction of circuit breaker, then pin 7a, 7b is embedded in elongated hole 4a, 4b; thinner wall section 8, from case of bending reduction, as shown in Fig. 5 (b), forms hinge structure 5 by embedding.

Usually this assist shroud 2a, 2b are not pulled down, but, when pulling down, by making thinner wall section 8a, 8b, 8c bend and slide on the end face of bearing portion 11a, 11b and assist shroud 2a, and this assist shroud 2a, 2b are slided to the direction contrary with arrow A, thus pulls down.The hinge structure 5 formed in the manner as described above can the scope of movement can make assist shroud 2a, 2b slide accordingly with pin 7a, 7b in elongated hole 4a, 4b, under the state that pin 7a, 7b are embedded in elongated hole 4a, 4b completely, above-mentioned assist shroud can be made to rotate and close cavity portion 6, then, by hold-down screw 12, assist shroud 2a, 2b can be fixed.

Execution mode 2.

In above-mentioned example, be configured to as shown in the plan view of figure 6, by assist shroud 2a, the 2b of symmetrical shape, the auxiliary equipment cavity portion 6 at the two poles of the earth is covered, but structure as described below also have effect of the present invention.Fig. 7 represents the front view of the circuit-breaker involved by execution mode 2, in this example embodiment, when there is not the auxiliary equipment cavity 6 of left pole, being formed as assist shroud 2b and the main 1b that covers forms, only being covered the structure of right pole auxiliary equipment cavity portion 6 by assist shroud 2a.

Execution mode 3.

In addition, Fig. 8 represents the front view of the circuit-breaker involved by execution mode 3, contrary with about the structure of Fig. 7, is the structure of the auxiliary equipment cavity being covered left pole by assist shroud 2b, other structure and effect identical with execution mode 1 and 2, therefore omit the description.

Above-mentioned execution mode is a part of the present invention, in addition, considers various variation within the scope of the invention.Such as, in the hinge structure 5 of execution mode 1, list following example, namely, in the inside of protruding bearing portion 11a, 11b of setting each other across predetermined distance from main cover 1b, elongated hole 4a, 4b are set, pin 7a, the 7b relative with above-mentioned elongated hole is provided with in a part of notch 10a, 10b of assist shroud 2b, but, can certainly be that their relation is exchanged, namely, main cover 1b arranges pin 7a, 7b, assist shroud 2b arranges notch 10a, 10b, also can obtain identical hinge structure.

In the circuit-breaker formed at execution mode as above, when this big current of the short circuit current that flows, be separated owing to repelling each other between contact (not shown) and produce electric arc between contact.This electric arc makes the gas of surrounding sharply expand, and forms arcing gas and is full of circuit breaker internal.The part of this arcing gas from tap (not shown) ejection, but, cannot spray completely, via auxiliary equipment with cavity 6 to assist shroud 2a, 2b transmission of pressure, form the active force boosted by the pin 7 of assist shroud 2a, 2b.Owing to assist shroud 2 being forced to be fixed on main cover 1b by hinge structure 5 and hold-down screw 12, therefore, the moment of this active force boosted changes and forms the pressure in the direction of the arrow B to Fig. 6.Arrow B is towards the pressure in circuit breaker inner face direction.

But under the state that assist shroud 2 is closed, the internal face 9 of assist shroud 2 is abutted by larger area with the main handle set 4 covering 1b, even if be applied with the pressure in arrow B direction, handle set 4 also can keep assist shroud 2 by larger area.Therefore, when this big current of the short circuit current that flows, even if be subject to the higher pressure caused by the electric arc produced between contact, also without the need to the quantity of the hold-down screw 12 by thickening for the wall of cover material or increase assist shroud 2, the destruction of assist shroud 2 can be prevented, disperse.Further, can obtain the rotation structure of assist shroud, the rotation structure of this assist shroud can be applied to the higher circuit-breaker of breaking capacity that the pressure increase that caused by arcing gas uprises.

In addition, as shown in Figure 2, under the state that assist shroud 2a, 2b open, assist shroud 2a, 2b do not abut with the main internal face covering the handle set 4 of 1b, can bend by making thinner wall section 8, thus the pin 7 of assist shroud 2a, 2b is free to slide in the horizontal, obstacle can not produced when removal and installation, easily assemble.

The explanation of label

1 Shell of circuit breaker, 1a pedestal, the main cover of 1b,

2a assist shroud (side, right pole), 2b assist shroud (side, left pole),

3 handles, 4 handle sets, 5 hinge structures,

6 auxiliary equipment cavity portion, 7 pins, 8 thinner wall section,

9 assist shroud internal faces, 10 notchs, 11 bearing portions,

12 hold-down screws, 100 circuit-breakers.

Claims

1. a circuit-breaker, it has: Shell of circuit breaker, and it is made up of pedestal and fixing main cover on the base, and disconnecting mechanism is accommodated in inside; Cavity portion, its be formed in described main cover with the surface of described pedestal opposite side, accommodate the auxiliary equipment of described disconnecting mechanism; And assist shroud, it links via the hinge part of ora terminalis and described main cover being arranged on described cavity portion, and covers described cavity portion,

The feature of this circuit-breaker is,

Described hinge part is made up of following parts:

Multiple bearing portion, they protrude from described main cover across predetermined distance each other and arrange;

Notch, it caves at the ora terminalis of described assist shroud across predetermined distance and arranges, for inserting described bearing portion;

Pin, it protrudes on to be arranged in described notch or bearing portion some, extends from the handle of circuit breaker to side surface direction;

Elongated hole, it is arranged on another in described notch or bearing portion, is formed in same axis with described pin, and chimeric with described pin by moving to the side surface direction of described assist shroud; And

Thinner wall section, it extends from described assist shroud to the bearing portion insertion portion of described notch.

2. circuit-breaker according to claim 1, is characterized in that,

When inserting bearing portion to described assist shroud, by utilizing described bearing portion end face to make described thinner wall section bend laterally, thus described pin can be made chimeric with elongated hole.

3. circuit-breaker according to claim 1 and 2, is characterized in that,

Described assist shroud is made up of right pole assist shroud and left pole assist shroud or some only in them.

4. circuit-breaker according to any one of claim 1 to 3, is characterized in that,

Closing described assist shroud and under the state that the auxiliary equipment cavity of main cover is covered, covering the handle set of handle and abutted by described internal face entirety with the internal face in assist shroud portion.