CN1318858A

CN1318858A - Circuit breaker

Info

Publication number: CN1318858A
Application number: CN 00131651
Authority: CN
Inventors: 河上正; 池幡洋司
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2000-04-18
Filing date: 2000-10-05
Publication date: 2001-10-24
Anticipated expiration: 2020-10-05
Also published as: CN1155978C; JP2001307613A

Abstract

A circuit breaker is provided with an insulated casing comprised of a base and a cover, a handle including a base part having a identification mark indicating an open-close condition attached and a handle part projecting from the base part toward outside of the insulated casing and capable of open-close operation, a fixed contact element including a fixed contact, a movable contact element including a movable contact facing, contacting and separating from the fixed contact element, an open-close mechanism driving the movable contact element, and an over current trip device operating the open-close mechanism in response to an over current. A cover member operating together with the open-close mechanism and covering the identification mark indicating a handle open-close condition to make it invisible when the fixed contact and the movable contact are welded is provided. Making an identification mark printed on a handle and indicating an open circuit condition visible in the case that a contact of a circuit breaker is welded.

Description

Circuit breaker

The present invention relates to circuit breaker, relate in particular to and discern the improvement of the handle portion of demonstration opening and closing operate condition.

Fig. 9 is the inner front view of local excision that the spy opens the conventional circuit breaker shown in the flat 10-172409 communique, the closed circuit state of expression circuit breaker.Among the figure, the 20th, by the insulation shell that pedestal 21 and lid 22 are formed, all make with the synthetic resin material.The 23rd, fixed contact, the 24th, be fixed on the fixed contact on this fixed contact 23, the 25th, movable contact, be provided with to this fixed contact 24 connect from travelling contact 25a.The 26th, support the support arm of this movable contact 25 integratedly, be formed with U font groove 26a, stop holding section 26b and with the axle 27 slotted hole 26c that engage described later.

The 27th, become the axle of the center of rotation of support arm 26 and movable contact 25.The 28th, to movable contact 25 to making it break away from the main spring of the direction reinforcing of fixed contact 24 all the time, the 29th, the handle of making of synthetic resin that carries out opening and closing operations from the outside, the 30th, to the back-moving spring of handle 29 to the counter clockwise direction reinforcing, the 31st, pole-timber is curved the operation link rod that forms behind the U font, one end engages with handle 29, and the other end engages with the link rod slot 32a of latch 32 described later.

The 32nd, axle is supported on the latch of axle on 27, the triggering sheet 32b of the pushing force of the bar 37 that be formed with the link rod slot 32a that engage with the other end of operation link rod 31, bears aftermentioned electromagnetism trip portion 34, owing to the crooked formed pushing force of bimetallic 33 described later is born and will be operated the triggering sheet 32c of the power that engages the releasing direction between link rod 31 and link rod slot 32a.Above-mentioned support arm 26, main spring 28, handle 29, back-moving spring 30, operation link rod 31 and latch 32 constitute switching mechanism.

In addition, handle 29 is by base portion 29a, reach the pinch hand 29b of housing 20 outsides and the protuberance 29c of attended operation link rod 31 constitutes from this base portion 29a, in order to see the "on" position of circuit, show the distinguished symbol of representing the on-off action state at the peripheral part of the base portion 29a of handle 29 from the peristome 20a of housing 20.29d is that the expression circuit breaker is first distinguished symbol (for example be carved with on handle 29 or be printed on symbol zero) of open-circuit condition, and 29e is that the expression circuit breaker is second distinguished symbol (for example be carved with on handle or be printed on symbol |) of closure state.That is the non-power status of distinguished symbol zero expression travelling contact 25a and fixed contact 24 disengagings.Distinguished symbol | the "on" position that expression travelling contact 25a contacts with fixed contact 24.

The 33rd, corresponding with electrical current and in Fig. 9, add the bimetallic of thermal flexure to the right, the 34th, the electromagnetism trip portion has and is subjected to the electromagnet 35 energising plungers 36 that formed electromagnetic force drove and because the attraction action of this plunger 36 and the bar 37 that protrudes left in Fig. 9.Form over current trip by above-mentioned bimetallic 33 and electromagnetism trip portion 34.The 38th, arc-extinction device, the 39th, the muffler plate of this arc-extinction device 38.The 40th, comprise the electric arc generation chamber of said fixing contact 24 and travelling contact 25, be full of the electric arc that produces when movable contact 25 leaves.The 41st, the arc runner (ア-Network ラ Application Na-) that electric arc is induced to arc-extinction device 38 directions.

In the circuit breaker of said structure, in case short circuit current flows into circuit, the electromagnet 35 of electromagnetism trip portion 34 is promptly to this perception, attract plunger 36, the bar 37 of interlock moves to push the triggering sheet 32b of latch 32 to the direction of arrow (left) with it, the other end that makes operation link rod 31 is deviate from and is done tripping operation action from link rod slot 32a, and movable contact 25 is broken away from a high speed, does the action of opening circuit.

When adopting above-mentioned conventional circuit breaker, when big electric current inflow circuit, travelling contact 25a and fixed contact 24 generations such as short circuit current were deposited, handle 29 can turn left and stop at the centre position (not shown) of open-circuit position and closed circuit position from position shown in Figure 9.At this moment, as circuit breaker, although be in travelling contact 25a and fixed contact 24 state of contact, promptly be in "on" position, the distinguished symbol of the handle 29 expression on-off action states of seeing from the peristome 20a of housing 20 is distinguished symbols zero of expression open-circuit condition.That is, the closed circuit position of the position of distinguished symbol zero expression of handle 29 and travelling contact 25a is inconsistent.

Therefore, in order to take place at travelling contact 25a and fixed contact 24 when deposited, can not see from the peristome 20a of housing 20 handle 29 expression open-circuit conditions the first distinguished symbol 29d, be distinguished symbol zero, must make it as far as possible near a side opposite with protuberance 29c, be hidden inside, so be difficult to identification when having caused open-circuit condition and closed circuit state at housing 20.

Display position owing to the distinguished symbol of expression on-off action on the handle 29 is limited again, so distinguished symbol is very little.

In order to address the above problem, purpose is to provide the circuit breaker that is imprinted on the distinguished symbol of expression open-circuit condition on the handle when a kind of contact generation when circuit breaker is deposited can not be seen just in the present invention.Purpose also is to provide the circuit breaker that a kind of distinguished symbol of representing open and-shut mode is big, be convenient to recognize.

Circuit breaker of the present invention has: insulation shell, form by the base and cover body; Handle has that to be arranged on this insulation shell inner and reach outside the insulation shell and can make the pinch hand of opening and closing operations with the base portion of the distinguished symbol that can see open and-shut mode from the outside with from this base portion; Fixed contact is installed on insulation shell inside and has fixed contact; Movable contact, have facing to this fixed contact connect from travelling contact; The switching mechanism that this movable contact is driven; With the overcurrent respective action so that the over current trip of switching mechanism work, be characterized in, be provided with when fixed contact and travelling contact are deposited and switching mechanism interlock, the distinguished symbol that covers expression open-circuit condition on the handle make it the shading member that can not see.

In addition, be provided with the wrist that is activated with the switching mechanism butt on the shading member and to handle on the gate that covered of the distinguished symbol of expression open-circuit condition.

Have, be provided with flexure strip on shading member, this flexure strip is to the direction reinforcing of gate portion distinguished symbol of expression open-circuit condition on the covering handle.

Simple declaration to accompanying drawing

Fig. 1 is the front view of the circuit breaker inside of expression the present invention one example, the deposited state of expression contact.

Fig. 2 is the local excision enlarged front view of presentation graphs 1 circuit breaker when being closed circuit state.

Fig. 3 is the local excision enlarged front view of presentation graphs 1 circuit breaker when being open-circuit condition.

Fig. 4 is local excision's enlarged front view of the deposited back of the contact of presentation graphs 1 circuit breaker state.

Fig. 5 is the shading member amplification stereogram of the invention process form 1 circuit breaker.

Fig. 6 is the stereoscopic figure of the invention process form 1 circuit breaker, and the expression circuit breaker is a closed circuit state.

Fig. 7 is the stereoscopic figure of the invention process form 1 circuit breaker, and the expression circuit breaker is an open-circuit condition.

Fig. 8 is the stereoscopic figure of the invention process form 1 circuit breaker, the state after the contact of expression circuit breaker is deposited.

Fig. 9 is the front view of conventional circuit breaker.

Example 1

Fig. 1 is the front view of the circuit breaker inside of expression the present invention one example, the deposited state of expression contact.Fig. 2 is the local excision enlarged front view of presentation graphs 1 circuit breaker when being closed circuit state.Fig. 3 is the local excision enlarged front view of presentation graphs 1 circuit breaker when being open-circuit condition.Fig. 4 is local excision's enlarged front view of the deposited back of the contact of presentation graphs 1 circuit breaker state.In Fig. 2～Fig. 4, for convenience of explanation, not shown main spring 28, swash is represented the cutting plane of local excision.Fig. 5 is the shading member amplification stereogram of the invention process form 1 circuit breaker.Fig. 6～Fig. 8 is the stereoscopic figure of the invention process form 1 circuit breaker, and Fig. 6 represents that circuit breaker is a closed circuit state, Fig. 7, and the expression circuit breaker is an open-circuit condition, Fig. 8 represents the state of the contact of circuit breaker after deposited.

Among the figure, the 20th, by the insulation shell that pedestal 21 and lid 22 are formed, all make with the synthetic resin material.The 23rd, fixed contact, the 24th, be fixed on the fixed contact on this fixed contact 23, the 25th, movable contact, be provided with to this fixed contact 24 connect from travelling

contact

25a, 25H is the movable contact support that supports this movable contact 25 integratedly.Connecting lead on movable contact 25, electric current flows through in the following order: lead-this lead connected the outside terminal of fixed contact 23 1 sides-fixed contact 23-fixed contact 24-travelling contact 25a-movable contact 25-by the outside terminal of the conductor of electromagnetism trip portion-side-be connected with the conductor of this electromagnetism trip portion one side.The 26th, to the support arm that movable contact support 25H carries out the axle supporting, the stop holding section 26b that is formed with U font groove 26a and engages with the retainer 21a of pedestal 21.The 27th, become the axle of the center of rotation of support arm 26 and movable contact 25.The 28th, to movable contact 25 to making it break away from the main spring of the direction reinforcing of fixed contact 24 all the time.

The 29th, the handle of making of synthetic resin that carries out opening and closing operations from the outside, by base portion 29a, reach the pinch hand 29b of housing 20 outsides and the protuberance 29c of attended operation link rod 31 constitutes from this base portion 29a, in order to see the "on" position of circuit, show the distinguished symbol of representing the on-off action state at the peripheral part of the base portion 29a of handle 29 from the peristome 20a of housing 20.29d is that the expression circuit breaker is first distinguished symbol of open-circuit condition, and 29e is that the expression circuit breaker is second distinguished symbol of closure state.About the first distinguished symbol 29d and the second distinguished symbol 29e, for example can engrave or stamp the symbol that symbol zero, English alphabet O, numeral 0 are used as representing open-circuit condition, can engrave or stamp symbol |, English alphabet I, numeral 1 be used as representing the symbol of closed circuit state.

The 30th, to the back-moving spring of handle 29 to the counter clockwise direction reinforcing, the 31st, pole-timber is curved the operation link rod that forms behind the U font, an end engages with the protuberance 29c of handle 29, and the other end engages with the link rod slot 32a (see figure 2) of latch 32 described later.The 32nd, axle is supported on the latch on the axle 27, is that the center is afterburning counterclockwise by not shown spring with axle 27, and being formed with the link rod slot 32a that engage with the other end of operation link rod 31 and making link rod 42 with the crooked formed pushing force of bimetallic 33 described later is that the center rotates counterclockwise and bears and will operate the triggering sheet 32c (see figure 2) of the power that engages the releasing direction between link rod 31 and link rod slot 32a with axle 43.When circuit breaker is closed circuit state, is circuit when being "on" position, as Fig. 2 and shown in Figure 6,3 the not shown power on the axle of operation link rod 31 of acting on average out and stop.That is, the power that support arm 26 is upwards pushed away based on the reinforcing of main spring 28 and from U word groove 26a, from axle be supported on the link rod slot 32a effect of the latch on the axle 27 power, and the power that acts on from the operation link rod 31 that is connected with handle 29 that the butt of lid 21 is restricted rotation because of pinch hand 29b average out.At circuit breaker when closed circuit state trips, for example as mentioned above, link rod 42 counterclockwise rotate and with the triggering sheet 32c butt of latch 32, latch 32 is counterclockwise rotated, not supported 26 last thrust, 3 equilibrium of forces that act on the operation link rod 31 are broken, operation link rod 31 moves the below left along the U word groove 26a of support arm 26, handle 29 counterclockwise rotates, and meanwhile, support arm 26 counterclockwise rotates.Also have, constitute switching mechanism 300 by above-mentioned movable contact support 25H, support arm 26, main spring 28, handle 29, back-moving spring 30, operation link rod 31 and latch 32.

The 33rd, corresponding with electrical current and add the bimetallic of thermal flexure left, the 34th, the electromagnetism trip portion has and is subjected to the power-actuated plunger 36 of the energising electromagnetism of electromagnet 35.Form over current trip by above-mentioned bimetallic 33 and electromagnetism trip portion 34.The 38th, the arc-extinction device that the electric arc that elimination produces between contact is used, the 39th, the muffler plate of this arc-extinction device 38.The 42nd, link rod, holding section 42a is pushed because of the bending of bimetallic 33, and is that counterclockwise rotate at the center with axle 43.

The 45th, with the shading member of synthetic resin material formation, as shown in Figure 5, in Handle axis (not shown), rotate freely through hole 45a, be located at an end and the wrist 45b, the flexure strip 45c that is wavy protrusion that are driven with the stop holding section 26b butt of support arm 26 1 ends, be located at the other end and the gate 45d that rotates along the display part periphery of handle 29 constitutes by intercalation.The inwall butt of flexure strip 45c and housing 20, all the time to shading member 45 to being the direction reinforcing that counterclockwise rotate at the center with through hole 45a.

On the circuit breaker of said structure, in case carry out opening and closing operations from the outside with handle 29, when circuit breaker is in closed circuit state, is that circuit is when being in "on" position, as Fig. 2 and shown in Figure 6, the position of handle 29 is tilted to the right, the second distinguished symbol 29e of handle 29 is positioned at the peristome 20a of housing 20, can see the distinguished symbol of expression closed circuit state from the outside |, can confirm that thus circuit is a "on" position.At this moment because travelling contact 25 contact with fixed contact 24, so the 45d of gate portion of shading member 45 pushed by the pinch hand 29b of handle 29, represent closed circuit state the first distinguished symbol 29d, be that the inside of housing 20 is gone in distinguished symbol zero Tibetan, can't see from the outside.

In addition, be in open-circuit condition at circuit breaker, when being the circuit non-power status, as Fig. 3 and shown in Figure 7, the position left bank of handle 29, the first distinguished symbol 29d of handle 29 turns to the position that can see from the peristome 20a of housing 20, can see the distinguished symbol zero of expression open-circuit condition from the outside, can confirm that circuit is a non-power status.At this moment because travelling contact 25a breaks away from fixed contact 24, so the time shading member 45 wrist 45b upwards pushed away by the support arm 26 of switching mechanism 300, be that the center clockwise direction rotates with through hole 45a, the 45d of gate portion hides into housing 20 inside.

Under the deposited state of the contact of circuit breaker, as Fig. 1, Fig. 4 and shown in Figure 8, because travelling contact 25a and fixed contact are deposited, so switching mechanism 300 is restricted, handle 29 stops on the centre position between open-circuit position and the closed circuit position.At this moment, shading member 45 by flexure strip 45c to being the direction reinforcing that counterclockwise rotate at the center with through hole 45a, so the gate 45d of portion turns to the position with the pinch hand 29b butt of handle 29, with the distinguished symbol 29d of the expression open-circuit condition of handle 29, be that distinguished symbol zero covers, distinguished symbol zero can not be seen from the outside of housing 20.Can confirm that thus circuit is a "on" position.

The switching mechanism of above-mentioned example 1 drives movable contact 25 from handle 29 through operation link rods 31, latch 32, support arm 26 and movable contact 25H, certainly also can adopt known elbow-bar mechanism as the circuit breaker of switching mechanism in utilization shading member 45 of the present invention.

In addition, also can stamp the expression contact on the surface of the 45d of gate portion of shading member is the literal of deposited state, for example stamps " deposited " two words.

In addition, can coat the expression contact on the gate portion 45d surface of shading member is the color of deposited state, such as coating Red.

The present invention adopts said structure, has following effect.

Breaker of the present invention is provided with when fixed contact and travelling contact are deposited and the switching mechanism interlock, with hand The shading member that the distinguished symbol of expression open-circuit condition covers on the handle is shown so available shading member covers on the handle The distinguished symbol that shows open-circuit condition can be "on" position by the Visual Confirmation circuit from hull outside.

In addition, owing to be provided with the wrist of switching mechanism butt and the driving that is subjected to handle at shading member The gate section that the distinguished symbol of upper expression open-circuit condition is covered is so will not be imprinted on the expression of handle base The distinguished symbol of open-circuit condition is located at the position that is hidden in enclosure interior, can increase distinguished symbol, is convenient to identification.

Again owing to be provided with flexure strip at shading member, to gate to the knowledge that covers expression open-circuit condition on the handle So the direction reinforcing of other symbol is needn't be in addition if the spring that gate section rotates is convenient to the breaker miniaturization.

Claims

1. circuit breaker has: insulation shell, form by the base and cover body; Handle has that to be arranged on this insulation shell inner and reach outside the insulation shell and can make the pinch hand of opening and closing operations with the base portion of the distinguished symbol that can see open and-shut mode from the outside with from this base portion; Fixed contact is installed on insulation shell inside and has fixed contact; Movable contact, have facing to this fixed contact connect from travelling contact; The switching mechanism that this movable contact is driven; With the overcurrent respective action so that the over current trip of switching mechanism work, it is characterized in that, be provided with when fixed contact and travelling contact are deposited with the switching mechanism interlock, with handle on the distinguished symbol of expression open-circuit condition cover the shading member of the state that can not see.

2. circuit breaker according to claim 1 is characterized in that, shading member is provided with wrist that is activated with the switching mechanism butt and the gate that the distinguished symbol of representing open-circuit condition on the handle is covered.

3. circuit breaker according to claim 2 is characterized in that, is provided with flexure strip on shading member, and this flexure strip is to the direction reinforcing of gate portion distinguished symbol of expression open-circuit condition on the covering handle.