CN1196155C

CN1196155C - Circuit breaker

Info

Publication number: CN1196155C
Application number: CNB008074836A
Authority: CN
Inventors: 高桥进; 伏见征浩; 细贝节夫; 山县伸示; 林道广; 铃木良三
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2000-03-17
Filing date: 2000-03-17
Publication date: 2005-04-06
Anticipated expiration: 2020-03-17
Also published as: EP1187158B1; DE60016743T2; JP4232370B2; EP1187158A4; WO2001071750A1; EP1187158A1; DE60016743D1; KR20010112489A; KR100445886B1; ES2234573T3; CN1350695A

Abstract

The present invention relates to a circuit breaker which is characterized in that a space block does not need to be arranged between circuit break units; the present invention is not easy to damage by high velocity flow of arc gas generated between contacts when large current, such as short circuit current, flows. The present invention comprises a contact mechanism formed from a moving contact (18) and a fixed contact (17), an opening/closing mechanism (30) for opening/closing the contact mechanism, an arc extinguishing device (59) for guiding an arc generated when the contact mechanical is separated to a prescribed direction, and a box body (10) for housing the mechanisms and the device, wherein in the circuit breaker, the contact mechanism and the arc extinguishing device are arranged in box bodies (51, 52) made from insulation material to form single-pole breaker units (50, 53, 56). Simultaneously, a multi-pole circuit breaker is formed by that the single-pole breaker units are connected with each other closely; a plurality of single-pole breaker units are arranged in parallel.

Description

Circuit breaker

Technical field

The present invention relates to a kind of circuit breaker, particularly, the present invention relates to a kind of like this multipole circuit breaker, described multipole circuit breaker system is made of the one pole breaking units that contact mechanism and arc-control device etc. is placed in housing, and forms by described one pole breaking units being accommodated in a plurality of box bodys.

Background technology

Figure 12 be as conventional art, for example, its application people be the sectional view that breaker portion excises shown in the flat 11-221501 specification of Japanese patent application of our company, the figure illustrates the closed circuit state of circuit breaker.Figure 13 is the sectional view of the ア-ア line along Figure 12.Figure 14 leaves the displayed map of state under the electromagnetic repulsion force action for moving contact in the circuit breaker of Figure 12.Figure 15 is the state diagram that circuit breaker shown in Figure 12 is done the tripping operation action.Figure 16 is the stereogram of the breaking units of circuit breaker shown in Figure 12.Among the figure, 10 is box body, is made of cassette holder box body 11 and lid 12, auxiliary lid 13, and above-mentioned box body is all the synthetic resin material and forms.14 is the handle that is formed by the synthetic resin material equally.35 is cross bar (retaining wall members), is made of the rotor portions 15 and the connecting pin 16 of synthetic resin material, and multipole rotor portions 15 is made one by connecting pin 16 and connected.Connecting pin 16 is connected in following switching mechanism.17 is fixed contact, has fixed contact 17a.18 is moving contact, has moving contact 18a, and remains in pivotally on the rotor portions 15 of axle 19.

Moving contact 18 is endowed towards the elastic force of arrow C direction by moving contact spring 21.That is, moving contact spring 21 is a torsion spring, and the one end is sticked in the peripheral part of rotor portions 15, and its other end is sticked in moving contact 18, by this, gives the elastic force of moving contact 18 arrow C directions.Therefore, with rotor portions 15 irrespectively, moving contact 18 can be resisted the elastic force of moving contact spring 21, to arrow D to rotation.Again, the rotational action interlock of this moving contact 18 and cross bar 35.That is, by the action of following switching mechanism 30, the rotor portions 15 of cross bar 35 is rotated, and then moving contact 18 moves with its rotation.In said structure, constitute contact mechanism by fixed contact 17, moving contact 18 and cross bar 35 etc.

20 is the moving contact retainer, and a pair of bonding conductor 20a (being shown in Figure 13) keeps being electrically connected under the pushing of moving contact spring 21 from the two side faces of two side clamping moving contacts 18.22 is trip(ping) bar, with the action interlock of over current trip (not shown).When trigger (tripping operation) bar 22 is a fulcrum when doing contrary pin to revolution with axle 28, switching mechanism 30 startings.The starting of switching mechanism 30 is rotated cross bar 35, makes moving contact 18 leave fixed contact 17, auto-cutout (tripping operation).Again, well-known, handle 14 can make switching mechanism 30 actions.

23 is the breaking units that is made of contact mechanism and arc-control device etc.Promptly, as shown in figure 13,23a is first box body, 23b is second box body, described box body is all formed by synthetic resin, wherein places the contact mechanism and the arc-control device (not shown) that are made of fixed contact 17, moving contact 18, axle 19, moving contact retainer 20, moving contact spring 21, cross bar 35 etc.The above-mentioned first box body 23a and the second box body 23b are engaged and blocking by a plurality of rivets 24 (being shown in Figure 12).In addition, as shown in figure 13, on the sidewall of the first box body 23a of the central electrode and the contiguous center utmost point, be equipped with the through hole 23c of first box body, on the sidewall of the second box body 23b of the central electrode and the contiguous center utmost point, be equipped with the through hole 23d of second box body.On the pair of sidewalls of the rotor portions 15 of cross bar 35, be equipped with rotor through hole 15a.

The through hole 23c of above-mentioned rotor through hole 15a and box body, the relation of 23d, when switching mechanism 30 made moving contact 18 be in closed circuit state by cross bar 35, above-mentioned box body through

hole

23c, 23d and rotor through hole 15a were communicated with, and formed the major part of arcing gas bleed hole.When this arcing gas bleed hole made moving contact 18 be in open-circuit condition at switching mechanism 30 nationalitys by cross bar 35, because rotor portions 15 is rotated, through hole 23c, the 23d of box body was 15 obturations of rotor portions.That is the arcing gas bleed hole of, opening is closed.

25 for being formed at the alternate spacer block of cassette holder 11 and lid 12 inside, and as shown in figure 13, this alternate spacer block is formed with baseplate part 25a and from the side-prominent next door 25b of baseplate part 25a two, sets the given size L between the utmost point of central electrode and its two sides adjacency.In addition, at the central electrode of this next door 25b and breaking units 23, be adjacent between the outside wall surface 23e of the first box body 23a of this central electrode and be formed with the first air channel 25c that is communicated with the first box body through hole 23c.Again, at the central electrode of this next door 25b and breaking units 23, be adjacent between the outside wall surface 23f of the second box body 23b of this central electrode and be formed with the second air channel 25d that is communicated with the second box body through hole 23d.Form the integral body of electric arc bleed hole by rotor through hole 15a, the first box body through hole 23c, the second box body through hole 23d, the first air channel 25c and the second air channel 25d again.

26 are the tripping operation actuator.As shown in figure 12, the one end is formed with the holding section 26a that engages with trip(ping) bar 22, and its other end is formed with the 26b of valve portion, and this device is done axle supporting with freely rotating by axle 31.27 is to be used for giving the torsion spring of contrary pin to elastic force to tripping operation with actuating 1 device 26, at ordinary times the 26a of valve portion is imposed the elastic force of the inaccessible first air channel 25c and the second air channel 25d direction.Shown in Figure 13 40 for being used to support be assembled in the framework of the switching mechanism 30 of central electrode.

In the circuit breaker of said structure, when the big electric current that flows through as breaking current, in its A-stage, because the reverse each other co-current of flow through fixed contact 17 and moving contact 18, fixed contact 17 and moving contact 18 do that electromagnetism is counter scolds action, become state shown in Figure 14.Moving contact 18 scolds action to leave from fixed contact 17 because of electromagnetism is counter, produce electric arc A between fixed contact 17a and moving contact 18a.Then, this electric arc A becomes gaseous state, and its gas is on every side sharply expanded, and forms high velocity air, flows in the whole space in breaking units 23.

The high velocity air nationality of above-mentioned arcing gas is directed being expelled to the outside by arc-control device not shown in the figures, simultaneously, also direction shown in the arrow B flows in Figure 13, emits towards air channel 25c, the 25d of alternate spacer block 25 through box body through

hole

23c, 23d from rotor through hole 15a.Nationality is by the flow at high speed of the arcing gas of emitting towards

air channel

25c, 25d, tripping operation is urged with the 26b of valve portion of actuator 26 drives direction left.By this, as shown in figure 14, the actuator 26 of tripping operation usefulness is that fulcrum is done along pin to rotation with axle 31.By the transmission of above-mentioned tripping operation with actuator, holding section 26a engages with trip(ping) bar 22, makes trip(ping) bar 22 make contrary pin to rotation.Rotate by this, the engaging of the known switching mechanism 30 that is formed by the moving linkage of elbow is removed, the time faster after electric arc A generation is carried out auto-cutout (tripping operation), becomes state as shown in figure 15.

When constituting aforesaid multipole circuit breaker, a plurality of one pole breaking units 23 are disposed in the box body 10 with certain width.In above-mentioned circuit breaker in the past, as shown in figure 13, will do 3 by the one pole breaking units 23 that contact mechanism and arc-control device etc. constitutes and place side by side in the box body 10, constitute three-pole breaker.A plurality of in abutting connection with being provided with when circuit breaker is done on distribution board, and be connected in the occasion of power supply bar etc., be necessary to keep the size L that stipulates between each utmost point fixed contact 17 as splicing ear, for example, keep the size of 35mm.Though between each breaking units 23, be provided with alternate spacer block 25, because of by alternate spacer block 25 each breaking units 23 of location, so, there is such problem; All around adjusting difficulty up and down, and the width dimensions of each breaking units 23 is restricted.

Again, each breaking units 23 is same unit to be done three be set up in parallel, and sidewall 23h, the 23j of its first box body 23a and sidewall 23m, the 23n of the second box body 23b form same wall thickness.Sidewall 23h, the 23j of the breaking units 23 of central electrode, 23m, 23n are strengthened by the framework 40 of supporting switching mechanism 30, with the utmost point about the central electrode adjacency (below, in Figure 13, the last utmost point is called the left utmost point, and the following utmost point is called the right utmost point)

lateral wall

23h, 23j, 23m, the 23n of breaking units 23 strengthen by the cassette holder sidewall 11a of box body 10.But sidewall 23m, the 23n of central electrode one side of the box body 23b of the breaking units 23 of the left utmost point and the box body 23a of right utmost

point breaking units

23 and 23h, 23j do not strengthen, it is thin-walled, so, exist easily by as the mobile problem of being destroyed of high-speed gas of the arcing gas that taken place during the large current interruption of short circuit current.

Again, because be provided with alternate spacer block 25, so the box body 23a of breaking

units

23,23 sidewall thickness can't provide intensity

higher box body

23a, 23b from restricted.

The present invention addresses the above problem and does, and the objective of the invention is to: a kind of circuit breaker is provided, and above-mentioned circuit breaker needn't be provided with alternate spacer block between each breaking units, and the box body that constitutes breaking units is survivable.

Summary of the invention

A kind of like this circuit breaker of circuit breaker system of the present invention, described circuit breaker has: when flowing through short circuit current in power circuit, make and between moving contact and fixed contact, form the contact mechanism that the electromagnetism repulsion force can take place, be connected in by cross bar on the moving contact of contact mechanism, make moving contact make the switching mechanism of on-off action by this, when the electric current in the power circuit surpasses setting, make the action of device trip(ping) bar, and the tripping mechanism that contact mechanism is separated by switching mechanism, the electric arc that takes place when contact mechanism is separated is directed to the arc-control device of prescribed direction, is formed with the box body that places above-mentioned each mechanism and device;

It is characterized in that, in above-mentioned circuit breaker, contact mechanism and cross bar and arc extinguishing are placed in box body made of insulating material, constitute the one pole breaking units, simultaneously, each one pole breaking units is connected airtight each other, a plurality of being set up in parallel constitutes multipole breaking units.

Again, above-mentioned circuit breaker also has the breaking units in abutting connection with the utmost point of the breaking units of central electrode, the breaking units that is adjacent to described central electrode and box body, and the wall thickness that connects the sidewall of box body one side near this sidewall thickness in abutting connection with the breaking units of the utmost point in abutting connection with box body central electrode one side makes wants big.

Again, in circuit breaker of the present invention, the fastening part is set,, breaking units is fixed in the cassette holder of box body by secure component in this fastening part at the breaking units of the adjacency utmost point.

Again, circuit breaker of the present invention have protuberance on the breaking units box body that is arranged at central electrode, with the box body of the breaking units that is arranged at adjacency on the recess of protuberance tabling, a plurality of breaking units are integrated.

Again, above-mentioned protuberance makes wedge-like, and described recess makes dovetail groove.

Again, circuit breaker of the present invention also has the breaking units in abutting connection with the utmost point of the breaking units of central electrode, the breaking units that is adjacent to described central electrode and box body, and this sidewall thickness in abutting connection with described box body one side of breaking units adjacency of the utmost point makes bigger than the sidewall wall thickness of its contiguous center utmost point one side.

Have, circuit breaker of the present invention has the recess that is arranged at the breaking units box body again, and has the fixed contact with the protuberance of this recess tabling.

The simple declaration of accompanying drawing

Fig. 1 is the stereogram of the circuit breaker of demonstration example 1 of the present invention.

Fig. 2 is the plane graph of the circuit breaker of demonstration example 1 of the present invention.

Fig. 3 is the cutaway view of the イ-イ line along Fig. 2.

Fig. 4 is the major part section plan of the breaking units of the circuit breaker of demonstration example 1 of the present invention.

Fig. 5 is the major part section plan of the breaking units of the circuit breaker of demonstration example 2 of the present invention.

Fig. 6 is the cutaway view of the ウ-ウ line along Fig. 5.

Fig. 7 is the major part section plan of the breaking units of the circuit breaker of demonstration example 3 of the present invention.

Fig. 8 is the major part section plan of the breaking units of the circuit breaker of demonstration example 4 of the present invention.

Fig. 9 is the major part section plan of the breaking units of the circuit breaker of demonstration example 5 of the present invention.

Figure 10 (A) is front section view for the figure of the breaking units of the circuit breaker of demonstration example 6 of the present invention, (B) is side view.

Figure 11 is the three-face view of the fixed contact of demonstration example 6 of the present invention.

Figure 12 is the cutaway view of the part excision of the circuit breaker of demonstration conventional art.

Figure 13 is the cutaway view of the ア-ア line along Figure 12.

Figure 14 makes the anti-cutaway view of scolding the part excision of operate condition of electromagnetism for the circuit breaker that shows Figure 12.

Figure 15 makes the cutaway view of the part excision of tripping operation operate condition for the circuit breaker that shows Figure 12.

Figure 16 is the stereogram of the breaking units of the circuit breaker of demonstration conventional art.

The optimal morphology that carries out an invention

Example 1

For describing the present invention in detail, describe with reference to accompanying drawing.

Fig. 1 is the stereogram of the circuit breaker of demonstration example 1 of the present invention.The plane graph of Fig. 2 after for the lid of unloading Fig. 1 circuit breaker.Fig. 3 is the cutaway view of the イ-イ line along Fig. 2.Fig. 4 is for showing the major part section plan of breaking units.Among the figure, 10 to 22,24,28,30,35,40 sign is omitted its explanation as the device of above-mentioned conventional art at this.

Fig. 1 ties up to cassette holder 11 and the lid 12 that the insulating material by synthetic resin prepared material etc. forms and assists the inside of the box body 10 that lid 13 constitutes to circuit breaker shown in Figure 3, is provided with following

breaking units

50,53,56.In Fig. 4,50 is the breaking units of central electrode (below, be called the C utmost point), and 53 is the breaking units with the left utmost point of central electrode adjacency (below, be called the L utmost point), and 56 is the breaking units with the right utmost point of central electrode adjacency (below, be called the R utmost point).

51 is first box body of the C utmost point, and 52 is second box body of the C utmost point; 54 is first box body of the L utmost point, and 55 is second box body of the L utmost point; 57 is first box body of the R utmost point, and 58 is second box body of the R utmost point.All box bodys are all formed by the insulating material of synthetic resin, wherein place the dynamic contact mechanism and the arc-control device 59 (being shown in Fig. 3) that are made of fixed contact 17, moving contact 18, axle 19, moving contact retainer 20, moving contact spring 21, cross bar 35;

Breaking units

50,53,56 is respectively by a plurality of rivet 24 joint unitizations.

Again, as shown in Figure 4, the sidewall 51a of first box body 51 of the C utmost point is identical with the wall thickness of the sidewall 52a of second box body 52, and the sidewall 51b of first box body 51 is also identical with the wall thickness of the sidewall 52b of second box body 52, and identical with the wall thickness of conventional art.The wall thickness of the sidewall 51a of the sidewall 54a of first box body 54 of the L utmost point and first box body 51 of the C utmost point is identical, and the wall thickness of the sidewall 51b of the sidewall 54b of first box body 54 of the L utmost point and first box body 51 of the C utmost point is identical.But the wall thickness of the sidewall 54a of first box body 54 of the wall ratio L utmost point of the sidewall 55a of second box body 55 of the L utmost point is big, and the wall thickness of the sidewall 55b of second box body 55 of the L utmost point also wall thickness than the sidewall 54b of first box body 54 of the L utmost point is big.

Again, the wall thickness of the sidewall 52b of the sidewall 58a of second box body 58 of the R utmost point and second box body 52 of the C utmost point is identical, and the sidewall 58b of second box body 58 of the R utmost point also wall thickness with the sidewall 52b of second box body 52 of the C utmost point is identical, and identical with the wall thickness of conventional art device.The wall thickness of the sidewall 58a of second box body 58 of the wall ratio R utmost point of the sidewall 57a of first box body 57 of the R utmost point is big, and the wall thickness of the sidewall 58b of second box body 58 of the wall ratio R utmost point of the sidewall 57b of first box body 57 of the R utmost point is big.

In the circuit breaker of said structure, when the big electric current that flows through as short circuit current, in its A-stage, because the reverse each other co-current of flow through fixed contact 17 and moving contact 18, fixed contact 17 and moving contact 18 do that electromagnetism is counter scolds action.Moving contact 18 scolds action to leave from fixed contact 17 because of electromagnetism is counter, produce electric arc A (as shown in Figure 3) between fixed contact 17a and moving contact 18a.Then, this electric arc A becomes gaseous state, and its gas is on every side sharply expanded, and forms high velocity air (gas blowout), flows in the whole space in breaking units 50.The action interlock of action thereafter and over current trip (not shown), trip(ping) bar 22 rotates, and removes by the moving linkage of known elbow and the engaging of switching mechanism 30, and carries out auto-cutout (tripping operation) in the time faster after electric arc A takes place.

Structure according to example 1, contact mechanism and cross wall 35 and arc-control device 59 place in box body made of insulating material, constitute the one pole breaking units, simultaneously, it is a plurality of that above-mentioned one pole breaking units closely is set up in parallel mutually, constitutes multipole breaking units, thus, needn't as the circuit breaker of conventional art, be the given size L between the fixed contact 17 of guaranteeing each utmost point, and alternate spacer block 25 is set between each breaking units.Thereby, can keep given size L at low cost easily, in addition, can enlarge the width of breaking units, for example, can enlarge the fabric width of fixed contact 17 grades, obtain the circuit breaker of uprated breaking capacity.

Again, central electrode one side with the

breaking units

53,56 of L, the R utmost point, promptly, the wall thickness of sidewall 57a, the 57b of the wall thickness of sidewall 55a, the 55b of second box body 55 of the L utmost point and first box body 57 of the R utmost point forms thicker, make the outer face of

sidewall

55a, 55b, 57a, 57b and

sidewall

51a, 51b, 52a, the 52b butt of the C utmost point, and keep the size L of regulation.Thus, can strengthen side wall strength, the electric arc high velocity air when big electric current such as the electric current that is short-circuited is difficult to destroy

box body

55,57.

Example 2

Fig. 5 is the major part section plan of the breaking units of the circuit breaker of demonstration example 2 of the present invention.Fig. 6 is the cutaway view of the ウ-ウ line along Fig. 5.Among the figure, 17 to 21,50 to 58 as example 1.55c and 55e (be arranged at the below of fastening part 55c, be equivalent to through hole 57c, be not shown in the figures) be for being formed at fastening part and the through hole on second box body 55 of the L utmost point, and 57c and 57e are fastening part and the through hole that is formed on first box body 57 of the R utmost point.As shown in Figure 6, the secure component of composition such as construction bolt 60 and nut 61 is fixed on the cassette holder 11 of box body 10 breaking

units

53,56.

Again, also can use tapping bolt (not shown) to replace construction bolt 60, its screw-in is not had the

box body

55,57 of through hole 55e, 57e, be fixed on the cassette holder 11 as secure component.Also can use the rivet (not shown) to be fixed on the cassette holder 11 again.

Structure according to example 2, because of being to use the secure component of the

breaking units

53,56 of L, the R utmost point to be fixed on the cassette holder 11, so, at the electromagnetism repulsion force that equidirectional electric current generated by the electric current of the C utmost point conductor of flowing through and flow through L, the R utmost point, make the

breaking units

53 and 56 of the R utmost point shift to the direction of leaving, can prevent the destruction of the cassette holder 11 and the lid 12 of box body 10 from the breaking units 50 of the C utmost point.

Example 3

Fig. 7 is the major part section plan of the breaking units of the circuit breaker of demonstration example 3 of the present invention.Among the figure, 17 to 21,50 to 58 as example 1.51d, 51e, 51f, 51g are a plurality of protuberances that are formed on sidewall 51a, the 51b of first box body 51 of the C utmost point, and 52d, 52e, 52f, 52g are a plurality of protuberances that are formed on sidewall 52a, the 52b of second box body 52.55d, 55g are a plurality of recesses that are formed on sidewall 55a, the 55b of second box body 55 of the L utmost point, and 57d, 57g are a plurality of recesses that are formed on sidewall 57a, the 57b of first box body 57 of the R utmost point.40a, 40b are a plurality of through holes that are formed on the framework 40.

Structure according to example 3, at the two sides assembling L of the breaking units 50 of the C utmost point, the

breaking units

53,56 of the R utmost point, when constituting the breaking units of three-pole breaker, a plurality of

protuberance

51d, 51g and 52d, 52g are embedded in a plurality of

recess

55d, 55g and 57d, the 57g, and a plurality of

protuberance

51e, 51f, 52e, 52f are embedded in through hole 40a, the 40b on the framework 40.Therefore, can locate a plurality of breaking

units

50,53,56 definitely, make it integrated, and assembly operation be easy.

Again, the

breaking units

53,56 of the breaking units 50 of the C utmost point and L, the R utmost point because of they with 19 one-tenth vertical faces of axle on mobile being restricted, so, when opening circuit, can prevent that only the

breaking units

50,53,56 of one pole moves.

Again, best though the fitting portion of being made up of protuberance and the recess chimeric with it must have one in each breaking

units

50,53,56 at least as enforcement form 3, have a plurality of.

Example 4

Fig. 8 is the major part section plan of the breaking units of the circuit breaker of demonstration example 4 of the present invention.Among the figure, 17 to 21,40,40a, 40b, 50 to 58,51e, 51f, 52e, 52f be as example 1.

51h, 51j are a plurality of wedge-like protuberances that are formed on sidewall 51a, the 51b of first box body 51 of the C utmost point, and 52h, 52j are a plurality of wedge-like protuberances that are formed on sidewall 52a, the 52b of second box body 52.55h, 55j are that to be formed at a plurality of dovetail groove 57h, 57j on sidewall 55a, the 55b of second box body 55 of the L utmost point be a plurality of dovetail grooves that are formed on sidewall 57a, the 57b of first box body 57 of the R utmost point.

Structure according to example 4, at the two sides assembling L of the breaking units 50 of the C utmost point, the breaking

units

53,56 of the R utmost point, when constituting the unit of three-pole breaker, a plurality of wedge-like protuberance 51h, 51j and 52h, 52j are embedded in a plurality of dovetail groove 55h, 55j and 57h, the 57j.By this, can locate a plurality of breaking

units

50,53,56 definitely, make it integrated, and assembly operation be easy.Have again,, make the breaking

units

53 and 56 of L, the R utmost point shift to the direction of leaving central electrode, can prevent the destruction of the cassette holder 11 and the lid 12 of box body 10 by the electric current of the C utmost point conductor of flowing through and the electromagnetism repulsion force of the equidirectional electric current generation of flow through L, the R utmost point.

Example 5

Fig. 9 is the major part section plan of the breaking units of the circuit breaker of demonstration example 5 of the present invention.Among the figure, 17 to 21,40,50 to 58 as example 1.The sidewall 51a of first box body 51 of the C utmost point is identical with the wall thickness of the sidewall 52a of second box body 52, and the sidewall 51b of first box body 51 of the C utmost point is identical with the wall thickness of the sidewall 52b of second box body 52, and identical with the wall thickness of conventional art.

The wall thickness of the sidewall 52a of the sidewall 55a of second box body 55 of the L utmost point and second box body 52 of the C utmost point is identical, and the wall thickness of the sidewall 52b of the sidewall 55b of second box body 55 of the L utmost point and second box body 52 of the C utmost point is identical.But the sidewall 54a of first box body 54 of the L utmost point is bigger than the wall thickness of the sidewall 55a of second box body 55 of the L utmost point, and the wall thickness of the sidewall 55b of second box body 55 of the wall ratio L utmost point of the sidewall 54b of first box body 54 of the L utmost point is big.

Again, the wall thickness of the sidewall 51a of the sidewall 57a of first box body 57 of the R utmost point and first box body 51 of the C utmost point is identical, and the wall thickness of the sidewall 51b of the sidewall 57b of first box body 57 of the R utmost point and first box body 51 of the C utmost point is identical, and identical with the wall thickness of conventional art device.The wall thickness of the sidewall 57a of first box body 57 of the wall ratio R utmost point of the sidewall 58a of second box body 58 of the R utmost point is big, and the wall thickness of the sidewall 57b of first box body 57 of the wall ratio R utmost point of the sidewall 58b of second box body 58 of the R utmost point is big.

Again, 51m, 51n are the sidewall 51a that protrudes in first box body 51 of the C utmost point, the positioning convex of 51b, 52m, 52n are the sidewall 52a that protrudes in second box body 52 of the C utmost point, the positioning convex of 52b, its cephalic par respectively with the outer wall butt of the

box body

55,57 of the adjacency utmost point, guarantee the size L that stipulates.

Structure according to example 5, sidewall 54a, the 54b of the

outside box body

54,58 of the L and the R utmost point, and the wall thickness of 58a, 58b form thicker, so, can with sidewall 54a, 54b, and the wall thickness of the cassette holder sidewall 11a (shown in two chain-dotted lines) of 58a, 58b adjacency form thinner.For example,, use when having the expensive material of excellent in strength, because that cassette holder side wall portion 11a can form is thinner, so the fee of material that can obtain cassette holder 11 reduces, circuit breaker cheaply as the material of the cassette holder 11 that places breaking units.

Example 6

Figure 10 (A) is front section view for the figure of the breaking units of the circuit breaker of demonstration example 6 of the present invention, (B) is side sectional view.Figure 11 is the three-face view of fixed contact that is assembled into the breaking units of Figure 10.(A) being plane graph, (B) is front elevation, (C) is side view.Among the figure, 15 to 21,24,50 to 52 as example 1, omits its explanation.

17b is the protuberance that is arranged at the portion of terminal 17c of fixed contact 17.50s is the terminal conveying end that is arranged on the

box body

51,52 of breaking units 50.50t is the box body recess that splicing ear conveying end 50s is provided with, and when fixed contact 17 was assembled into terminal conveying end 50s, protuberance 17b was embedded in box body recess 50t.At this moment, can form clearance G between sidewall 51u, the 52u of the biend of portion of terminal 17c and terminal conveying end 50s.

Structure according to example 6, protuberance 17b is set on fixed contact 17, this protuberance 17b is embedded in the box body 51 of breaking

units

50,52 box body recess 50t, so, when being short-circuited current interruption, and when external cable being anchored on portion of terminal 17c with the terminal bolt (not shown), even portion of terminal 17b revolution, its turning power is also because of being obstructed in box body recess 50t by protuberance 17b, on the sidewall of terminal conveying end 50s because gapped G, turning power is inoperative, but turning power acts on box body recess 50t and breaking

units

51,52 biend 51v, the bigger thick wall part of intensity between the 52v, so, breaking

units

51,52 be difficult to impaired.

Again,, breaking units can be done to such an extent that width is bigger, thus, also make box body recess 50t width bigger, suitable because be not provided as the alternate spacer block 25 of the device of conventional art.

Utilizability on the industry

As mentioned above, according to breaker of the present invention, contact mechanism and cross bar and arc extinguishing are placed in insulating materials In the box body of system, consist of the one pole breaking units, simultaneously, each one pole breaking units is connected airtight each other, also a plurality of Row arrange, and consist of multipole breaking units. Thus, needn't be as the breaker of conventional art, for guaranteeing Given size between each utmost point static contact and alternate spacer block is set between each breaking units can be at low cost Guarantee the size stipulated. Again, can enlarge the width of breaking units, obtain opening circuit of high nominal short-circuit capacity Device.

Again, according to breaker of the present invention, described breaker also have central electrode breaking units, be adjacent to institute State the breaking units of central electrode and the breaking units in abutting connection with the utmost point of box body, the breaking units in abutting connection with this in abutting connection with the utmost point The wall thickness of sidewall that connects a side of box body near the sidewall thickness of box body central electrode one side makes wants big. Thus, Can improve side wall strength, when taking place such as the opening circuit of the big electric current of short circuit current, the arcing gas shape of generation The high velocity air that becomes is not easy to destroy box body.

Again, according to breaker of the present invention, in abutting connection with the breaking units of the utmost point fastening part is set at breaker, tight at this Gu section is fixed in breaking units on the cassette holder of box body by secure component. Thus, by the central electrode of flowing through Electric current and the electromagnetism repulsion force of flowing through and generating in abutting connection with the equidirectional electric current of the utmost point of conductor, make in abutting connection with the utmost point Breaking units is difficult to mobile, can prevent the destruction as cassette holder and the lid of box body.

Again, according to breaker of the present invention, described breaker has on the breaking units box body that is arranged at central electrode Protuberance, with the box body of breaking units that is arranged at adjacency on the recess of protuberance tabling, thus, Can locate reliably a plurality of breaking units, make it integrated, its assembly operation is easy.

Again, according to breaker of the present invention, above-mentioned protuberance make have wedge-like, recess makes dovetail groove. The institute With, can locate reliably a plurality of breaking units, make it integrated, and its assembly operation is easy. Simultaneously, By the electric current of the conductor of the central electrode of flowing through and the electromagnetism of flowing through and generating in abutting connection with the equidirectional electric current of the utmost point Repulsion force makes in abutting connection with the breaking units of the utmost point to be difficult to move, and can prevent as the cassette holder of box body and breaking of lid Bad.

Again, according to breaker of the present invention, described breaker also have central electrode breaking units, be adjacent to institute State the breaking units of central electrode and the breaking units in abutting connection with the utmost point of box body, the breaking units box in abutting connection with this in abutting connection with the utmost point The sidewall wall thickness that connects central electrode one side near the sidewall thickness of body one side makes wants big. Thus, adopting high price Material is used as the cassette holder material that places breaking units, can the formation of cassette holder sidewall is thinner, obtain cassette holder Fee of material lower, breaker cheaply.

Have, according to breaker of the present invention, described breaker has the recess that is arranged at the breaking units box body again, And have static contact with the protuberance of this recess tabling, and therefore, when short circuit current opens circuit and with the outside When electric wire was connected in the portion of terminal of static contact, breaking units was difficult to breakage.

Claims

1. circuit breaker, described circuit breaker has: when flowing through short circuit current in power circuit, make and between moving contact and fixed contact, form the contact mechanism that the electromagnetism repulsion force can take place, be connected on the moving contact of contact mechanism by cross bar, make moving contact make the switching mechanism of on-off action by this, when the electric current in the power circuit surpasses setting, start trip(ping) bar, and the tripping mechanism that contact mechanism is separated by switching mechanism, the electric arc that takes place when contact mechanism is separated is directed to the arc-control device of prescribed direction, is formed with the box body that places each mechanism and device; It is characterized in that,

In above-mentioned circuit breaker, contact mechanism and cross bar and arc extinguishing are placed in box body made of insulating material, constitute the one pole breaking units, simultaneously, each one pole breaking units is connected airtight each other, a plurality of being set up in parallel constitutes multipole breaking units.

2. circuit breaker as claimed in claim 1, it is characterized in that, described circuit breaker also has the breaking units in abutting connection with the utmost point of the breaking units of central electrode, the breaking units that is adjacent to described central electrode and box body, and the wall thickness that connects the sidewall of described box body one side near this sidewall thickness in abutting connection with described box body central electrode one side of breaking units adjacency of the utmost point makes wants big.

3. circuit breaker as claimed in claim 1 is characterized in that, at the breaking units of the adjacency utmost point fastening part is set, and in this fastening part, breaking units is fixed in the cassette holder of box body by secure component.

4. circuit breaker as claimed in claim 2 is characterized in that, at the breaking units of the adjacency utmost point fastening part is set, and in this fastening part, breaking units is fixed in the cassette holder of box body by secure component.

5. as each described circuit breaker of claim 1 to 4, it is characterized in that described circuit breaker has the protuberance on the breaking units box body that is arranged at central electrode, with the recess that is arranged at the protuberance tabling on the box body of the breaking units of the utmost point.

6. circuit breaker as claimed in claim 5 is characterized in that described protuberance makes wedge-like, and described recess makes dovetail groove.

7. circuit breaker as claimed in claim 1, it is characterized in that, described circuit breaker also has the breaking units in abutting connection with the utmost point of the breaking units of central electrode, the breaking units that is adjacent to described central electrode and box body, and the sidewall wall thickness that connects central electrode one side near this sidewall thickness in abutting connection with above-mentioned box body one side of breaking units adjacency of the utmost point makes wants big.

8. as each described circuit breaker of claim 1 to 4, it is characterized in that described circuit breaker has the recess that is arranged at the breaking units box body, and have the fixed contact with the protuberance of this recess tabling.

9. circuit breaker as claimed in claim 5 is characterized in that described circuit breaker has the recess that is arranged at the breaking units box body, and has the fixed contact with the protuberance of this recess tabling.

10. as claim 6 or 7 described circuit breakers, it is characterized in that described circuit breaker has the recess that is arranged at the breaking units box body, and have the fixed contact with the protuberance of this recess tabling.