CN1055564C

CN1055564C - Molded-case multicircuit breakers

Info

Publication number: CN1055564C
Application number: CN96100474A
Authority: CN
Inventors: 黑野透; 林秀晃
Original assignee: Nitto Kogyo Corp
Current assignee: Nitto Kogyo Corp
Priority date: 1996-01-26
Filing date: 1996-01-26
Publication date: 2000-08-16
Anticipated expiration: 2016-01-26
Also published as: CN1155746A

Abstract

The present invention relates to a molded box type multicircuit breaker which is subjected to insufficient contact pressure in the non-electrode position and can be free from damage. The molded box type multicircuit breaker is at least provided with two circuits. The molded box type multicircuit breaker comprises a handle, a first pin, a pin and a second pin, wherein the handle is used for simultaneously switching on and switching off circuits; the first pin is provided with a movable contact for the first circuit; the pin is provided with a movable contact for a circuit which is not the first circuit, wherein the first pin is designed into a pin directly switched on or switched off by the handle; the second pin is used for electrically insulating the pin for the circuit which is not the first circuit from the first pin, and is elastically connected to the first pin. The second pin can be pivoted with the first pin or can be elastically arranged on the first pin.

Description

Molded-case multicircuit breakers

The present invention relates to a kind of molded-case multicircuit breakers, it has a plurality of by single lever operated pin (moving contact).

For example, as shown in Figure 1, in prior art mold pressing boxlike two circuit-breakers, wherein two circuit adapt to become and connect simultaneously and disconnect, two

pins

22,23 are connected the bottom of handle 21 independently, and interconnect by resin plate 24, and resin plate 24 is blocked in the centre by the bottom tail end of spring 25 with superior isolation performance.In this structure, these two

pins

22,23 are designed to be operated simultaneously by single handle 21.

As shown in Figure 1 like this in prior art mold pressing boxlike two circuit-breakers, the power of spring 25 is designed to pass to the

22,23 with moving

contact

22a and 23a respectively by resin plate 24, when handle 21 is moved the connection side to,

22,23 is pressed on the fixed contact respectively tightly.Yet, in this spline structure, therefore the contact pressure that pair of contact can have deficiency providing uneven contact pressure between two contacts are to (each is to being made up of a fixed contact and a moving contact), and can take place in these

pins

22,23 distortion probably accidentally.Particularly, if with pin 23 relatively, pin 22 is deformed into to fixed contact and protrudes, and contacts the prevention that just is subjected to pin 22 so between pin 23 and fixed contact.Therefore, the contact pressure of pin 23 just becomes littler than the contact pressure of pin 22.In addition, in the prior art molded-case multicircuit breakers, torsional stress concentrates on the joint of

metallic pin

22,23 and resin plate 24 probably, with the resin plate 24 that breaks at joint.

An object of the present invention is to provide a kind of mold pressing multicircuit circuit breaker that has overcome intrinsic problem in the prior art as mentioned above, it stands not enough contact pressure in noncontact to locating, and it avoids internal damage.

Realize that the present invention is in order to overcome the problems referred to above, it provides a kind of molded-case multicircuit breakers with a plurality of pins (for example two pins), these pins are operated simultaneously by single handle, with connection-disconnection conversion of carrying out a plurality of circuit (for example two circuit), it is characterized in that first moving contact directly is fixed on first pin, and second moving contact be fixed on second the pin on, and be that second pin flexiblely is connected on first pin, so that insulate with first moving contact by insulating material.

According to molded-case multicircuit breakers of the present invention, a plurality of pins are by single lever operated, to connect simultaneously as prior art and to disconnect a plurality of circuit.Yet, in the present invention,, second pin goes up (with electric insulation from here) because flexiblely being connected first pin, so the moving contact of each pin is not subjected to the prevention of other pin, but can makes and contact with corresponding fixed contact with enough contact pressures.In addition, unlike the prior art, do not have torsional stress to act on the joint of pin, therefore can eliminate incident damage.

The novel features set forth in detail in accessory claim that is considered to of the present invention.With reference to the narration of the following present preferred embodiment that proposes together with accompanying drawing, the present invention can get the best understanding together with its purpose and advantage, wherein:

Fig. 1 is the sectional drawing of prior art molded-case multicircuit breakers.

Fig. 2 (a) represents outward appearance according to the molded-case multicircuit breakers with two switching circuits of the first embodiment of the present invention with end view;

Fig. 2 (b) is the sectional drawing of being got along Fig. 2 (a) straight line A-A of looking from the right side;

Fig. 3 (a) and Fig. 3 (b) are the sectional drawings of looking from the left side that molded-case multicircuit breakers shown in Figure 2 is got along Fig. 2 (b) straight line B-B; The state of first switching circuit when wherein Fig. 3 (a) is illustrated in handle and is transformed into on-position, and the state of Fig. 3 (b) first switching circuit when being illustrated in handle and being transformed into open position.

Fig. 4 (a) be molded-case multicircuit breakers shown in Figure 2 along the sectional drawing of looking from the left side that Fig. 2 (b) straight line C-C is got, the state of second switch circuit when being illustrated in handle and being transformed into on-position;

Fig. 4 (b) is the decomposition diagram of the major part of molded-case multicircuit breakers shown in Figure 2, and the correlation between handle and two pins is described;

Fig. 5 (a) represents outward appearance according to the molded-case multicircuit breakers of the second embodiment of the present invention with end view;

Fig. 5 (b) is the sectional drawing of being got along Fig. 5 (a) straight line D-D of looking from the right side; And

Fig. 5 (c) is the sectional drawing of being got along Fig. 5 (b) straight line E-E of looking from the left side.

Followingly will narrate in more detail according to mold pressing boxlike two circuit two contact circuit breakers of the present invention by preferred embodiment.

Fig. 2 to Fig. 4 represents the first embodiment of the present invention: Fig. 2 (a) represents the outward appearance of circuit breaker with end view; Fig. 3 represents the sectional drawing of first circuit of circuit breaker, (a) is assumed to on-state, and (b) is assumed to off-state; Fig. 4 (a) expression second circuit is assumed to the sectional drawing of on-state; And Fig. 4 (b) is with correlation between decomposition diagram explanation handle and two pins and their structure.In these accompanying drawings, label 1 expression handle; First pin corresponding that label 2 expressions are made by electric conducting material with first circuit; And second pin corresponding made by insulating material of label 3 expression with second circuit.

Shown in Fig. 4 (b), first pin 2 partly is made of 2L1 part and 2L2, and their pitman 2d (it is expressed as part and cuts) connections parallel with one another by being made by electric conducting material are to constitute an integral body.A moving contact 7 directly is fixed on the bottom of 2L1 part.Simultaneously, the 2L2 part is partly shorter than 2L1, and around pitman 2d termination.Pivotally connected in the bottom of first pin 2 by second pin 3 that insulating material is made by pin 9, and promote by spring 11 clockwise directions.Should be noted that these sketch maps are illustrative, and the present invention is not limited to these sketch maps.

Conducting block 14 is connected the lower end of second pin 3, and moving contact 12 is fixed on the surface, the left side of piece 14.Therefore, although the moving contact 7 of first circuit directly is fixed on the 2L1 part of first pin 2 that electric conducting material makes, the moving contact 12 of second circuit be fixed on by insulating material make flexiblely pivotally connected on second pin 3 of first pin 2.Subsidiary mentioning can allow the 2L1 of first pin 2 partly to have the structure identical with the 2L2 part, and can flexiblely pivotally connectedly as being connected the second circuit side be sold in first of first circuit side by second pin that insulating material is made.

The 2L1 part and the 2L2 part of first pin 2 have

U-lag mouth

31a, 31b separately in the upper part, and these

notches

31a, 31b are designed to mesh respectively axle 4a, the 4b that protrudes from the following front and the back side of handle 1.The elastic force of the spring 6 that stretches between the pin 9 of first pin 2 by means of the support 5 and first pin 2 can be carried out known crank switch motion by handle 1.Therefore, shown in Fig. 3 (a), when handle 1 is moved the connection side to, the moving contact 7 of the circuit of winning is contacted with fixed contact 8.

Therefore, end 41 since first circuit of two circuit-breakers, 2L1 part, fexible conductor twisted wire 43, bimetal leaf 44, lead 45 by lead 42, fixed contact 8, moving contact 7, first pin 2, being connected to the conducting channel of holding 46, is on-state to allow the supposition of first circuit.

Simultaneously, second pin of being made by insulating material (for example synthetic resin) 3 passes through pin 9 pivotally connected upper positions at first pin 2.Shown in Fig. 4 (b), second pin 3 has an arm that stretches upwards 10, and a spring 11 places between the arm 10 and first pin 2.Second pin, 3 power by spring 11 flexiblely promote, and rotate around pin 9 with clockwise direction in Fig. 4 (a) and Fig. 4 (b), so that the moving contact 12 that the feasible lower end that is positioned at second pin 3 is fixed on the conducting block 14 contacts with fixed contact 13.

Therefore, from the end 51 of second circuit, by lead 52, fixed contact 13, moving contact 12, conducting block 14, fexible conductor twisted wire 53 and lead 55, being connected to the conducting channel of holding 56, is on-state to allow the second circuit supposition.

Subsidiary mentioning, the support 5 shown in Fig. 3 (a), Fig. 3 (b) and Fig. 4 (a) are when the electric current that surpasses predetermined current value flows through bimetal leaf 44, and tripping operation makes circuit breaker be transformed into the device of off-state from on-state.Support 5 left end portion are by the 61 pivot supports of a pin, and right end portion and at the centering ring of the fixing elastomer 63 of upper position around notch 65 engagements that form.

When the electric current that flows through bimetal leaf surpassed predetermined value, bimetal leaf 44 bendings were counterclockwise to rotate around fixing upper part.So the end portion 64 of elastomer 63 is pressed to counterclockwise by the bimetal leaf 44 of such bending and rotated, and notch 65 moves right, so that the right end portion of support 5 breaks away from notch 65.The support 5 of Tuo Liing rotates around pin 61 clockwise directions like this, at the crank fulcrum place that moves first pin 2 (with second pin 3) is moved on to open position.

As mentioned above, by the tripgear of overcurrent starting in this area widely known to, and be not limited to such device according to circuit breaker of the present invention.In other words, the present invention can be applied to all multi-line circuit breakers, and no matter be with or without the trip avoidance function that under overcurrent, starts.

Simultaneously, first pin, 2 and second pin 3 that is used for two circuit-breakers by single handle 1 operation is shown in Fig. 4 (b), if the 3rd pin of arranging one as second pin 3 in parallel in addition, then the present invention can be implemented in the three-circuit circuit breaker that is used for the three-phase alternating current source circuit.

As mentioned above, because second pin 3 flexiblely is connected on first pin 2, so unlike the prior art, a pin can not be subjected to another pin to be stoped, and contact with corresponding fixed contact, and can under the effect of the power of brute spring 6, make

2,3 contact with fixed

contact

8,13 with even contact pressure respectively.Therefore, there is not electrode to have not enough contact pressure.In addition, unlike the prior art, do not have the joint of excessive twisting force between first pin, 2 and second pin 3, therefore can eliminate incident damage equally.

According to the second embodiment of the present invention shown in Figure 5, fix insulated synthetic resin 15 in the bottom of first pin 2, and second pin 3 is spring loaded on insulator 15.Second pin 3 is usually promoted forward by the elastic force that places the spring 11 between insulator 15 and second pin 3, contacts with the fixed contact 13 of second circuit so that be arranged on second moving contact of selling on 3 the bottom 12.

Moreover in a second embodiment, can as first embodiment, make

2,3 contact with fixed

contact

8,13 with even contact pressure respectively, so that do not have the contact pressure deficiency.In addition, do not worry selling the damage of 3 joint at first pin 2 and second.Here should be noted that second pin 3 is spring loaded 2L2 parts at first pin 2 in the above-described embodiments, the 2L1 part of first pin 2 can allow to have the shape identical with the 2L2 part, and another spring loaded pin can partly be connected with 2L1.

As mentioned above, advantage of the present invention is, because the second pin bottom flexiblely is connected with first pin, thus there is not electrode to have the contact pressure deficiency, and be not easy to damage at the joint of pin.Therefore, overcome the circuit breaker of intrinsic problem in the prior art, had very high value according to mold pressing boxlike multipole circuit breaker of the present invention as a kind of.

Though only narrated two embodiment of the present invention here, those skilled in the art should clearly not violated under the spirit or scope of the present invention, the present invention can be with obtaining enforcement in many other specialized form.Therefore, it is illustrative that the foregoing description should be regarded as, rather than as determinate, and the present invention is not limited to given details here, but can be changed in the accessory claim scope.

Claims

1。A kind of molded-case multicircuit breakers has two at least by single lever operated connection one dead circuit, comprising:

A handle;

One first pin has a moving contact that is used for first circuit;

Another pin has a moving contact that is used for not being a circuit of described first circuit; It is characterized in that,

Described first pin is designed to directly be connected and disconnected by described handle, and the described pin and the described first pin electric insulation that are used for not being a circuit of described first circuit, and sells and flexiblely be connected with described first.

2。Molded-case multicircuit breakers according to claim 1 is characterized in that, is not that the described pin of described first pin is pivotally connected on described first pin.

3。Molded-case multicircuit breakers according to claim 1 is characterized in that, is not that the described pin of described first pin is spring loaded on described first pin.