CN101075513B - Circuit circuit-breaker - Google Patents

Abstract

This invention relates to circuit breakers. The object of the present invention is to provide a circuit breaker that prevents partial bending of a lead wire, increases the angle of rotation of a movable contact connected to the lead wire, and realizes miniaturization around the lead wire. The solution is: wind the wire (7) on the movable piece shaft pin (8) for more than 1/2 circle, and at the same time, wire the wire (7) so that the wire (7) and the movable contact ( 4) The orbit of rotation of the joint portion is drawn approximately along the tangential direction.

Description

circuit breaker

technical field

The present invention relates to circuit breakers and is particularly applicable to the construction of flexible conductors for connecting movable contacts of circuit breakers to stationary conductors.

Background technique

In electrical equipment handling large amounts of electric power, circuit breakers are used to interrupt short-circuit currents or load currents flowing to loads.

Fig. 4 is a cross-sectional view showing a schematic configuration of a conventional circuit breaker.

In Fig. 4, in the circuit breaker, a movable contact 104 and a fixed contact 101 are provided, a movable contact 103 is provided at the front end of the movable contact 104, and a fixed contact is provided at the fixed contact 101. 102. In addition, in the circuit breaker, a movable contact supporting frame 105 for supporting the movable contact 104 is provided. And, the movable contact 103 is configured to be able to rotate around the movable member shaft pin 108, so that the movable contact 103 can be in contact with the fixed contact 102, or away from the fixed contact 102, and the movable contact 103 is pressed against the movable contact 103 by the pressure contact spring 106. Energize in the direction of the fixed contact 102 . A flexible wire 107 is connected to the rear end of the movable contact 104 , and the movable contact 104 is connected to the connecting plate 109 through the wire 107 . In the circuit breaker, an opening and closing mechanism unit 111 connected to the movable contact support frame 105 is provided. In addition, the opening and closing mechanism unit 111 can rotate the movable contact support frame 105 during an opening operation based on the operation of the handle 112 or the current detection result of the current detection unit 110 .

Here, in a circuit breaker with a rated current exceeding 250A, generally, the lead wire 107 is arranged linearly below the movable contact support frame 105 such that the rotation axis of the movable contact support frame 105 is positioned above the lead wire 107 . In addition, in order to give the lead wire 107 the flexibility to withstand at least several thousand times of bending, and to ensure a sufficient cross-sectional area for the rated current to flow, a stranded copper wire made by twisting a plurality of ultra-fine copper wires to form a rope is used. wire, or a braided copper wire braided with extra-fine wire, as the wire 107.

For example, in Patent Document 1, the following method is disclosed: in the circuit breaker, the fixed contact is fixed on the housing, the movable contact performs on-off movement relative to the fixed contact, and the connecting plate is fixed on the housing , using a flexible wire to connect the movable contact and the connection plate, disposing the wire connection part of the connection board on the side of the movable contact, so that the wire is bent into a U-shape, thereby connecting the wire connection part and the movable contact Moving contacts.

Patent Document 1: Japanese Patent No. 2583799.

However, in the method in which the lead wire 107 is linearly arranged under the movable contact support frame 105, although the angle change of the joint portion between the lead wire 107 and the movable contact 104 is small, the lead wire 107 is given a length due to the movement of the movable contact 104. direction displacement. Also, if the linearly extending lead wire 107 is compressed along the longitudinal direction, the lead wire 107 is partially bent at many places, and the rotational movement angle of the movable contactor 104 cannot be increased. In addition, if the movable contactor 104 cannot be provided with a sufficient rotation angle, the length of the movable contactor 104 needs to be extended in order to ensure the contact interval necessary for breaking the circuit, resulting in a problem of increasing the size of the circuit breaker. In addition, since the lead wire 107 extends linearly, the space required for arranging the lead wire 107 increases, and there is a problem of further increasing the size of the circuit breaker.

In addition, in order for the lead wire 107 to withstand local repeated bending, it is necessary to make the raw material wire constituting the lead wire 107 thinner, which is easily affected by corrosion and the like, and the price also becomes higher.

In addition, in the method disclosed in Patent Document 1, it is necessary to arrange the lead wire connection portion of the connection plate on the side of the movable contact, which makes it difficult to arrange the connection plate in a multi-pole circuit breaker.

Contents of the invention

The present invention is proposed to solve the above-mentioned problems in the prior art, and its purpose is to provide a method that can prevent the local bending of the wire and increase the rotational movement angle of the movable contact connected to the wire. At the same time, it is a circuit breaker that can realize the compactness of the wire periphery.

In order to achieve the above object, the present invention provides a circuit breaker, which is characterized in that it includes: a fixed contact with a fixed contact; a movable contact with a movable contact that can be opened and closed with the fixed contact; The movable contact and the flexible lead wire of the connecting plate; and the movable contact support frame holding the movable contact so that the movable contact can rotate around the rotation axis, wherein the lead wire is routed to It is wound around the rotation shaft of the movable contact, and the position of the junction between the conductive wire and the movable contact is set so that the displacement of the conductive wire caused by the rotation of the movable contact is controlled by the bending of the conductive wire. Radius changes are absorbed.

In this way, it is not necessary to arrange the wires to extend in a straight line, and the overall outer diameter of the wires can be changed, and the movable contact can be rotated without compressing the wires in the length direction. The displacement of the wire is absorbed by the wire. Therefore, the space necessary for arranging the lead wires can be reduced, and at the same time, the rotational movement angle of the movable contact can be increased without increasing the length of the movable contact, and the contact interval necessary for disconnection can be ensured to realize a circuit breaker. miniaturization.

As the movable contact rotates, the displacement of the wire is caused, and the displacement can be distributed over the entire wire, preventing the bending of the wire from concentrating on a specific position. Therefore, it is possible to use a wire having a thicker raw material wire, and it is less susceptible to corrosion and the like, and the price can be suppressed.

The circuit breaker according to the second aspect is characterized in that the lead wire is wound more than 1/2 turn around the rotating shaft of the movable contact, and it is routed such that the lead wire and the The orbit of rotation of the engagement portion of the movable contact is drawn substantially along a tangential direction.

In this way, the displacement of the wire caused by the rotation of the movable contact can be absorbed by the change of the bending radius of the wire, and local bending of the wire can be prevented. At the same time, it is not necessary to arrange the wire to extend in a straight line, and the circuit breaker can be miniaturized and low in price. and high performance.

The circuit breaker according to claim 3, wherein the lead wire is formed in a U-shape and opened on a side opposite to the contact point of the movable contact.

The circuit breaker according to claim 4 is characterized in that it is arranged such that the rotation axis of the movable contact support frame is coaxial with the rotation axis of the movable contact.

As described above, according to the present invention, the space required for arranging the wires can be reduced, and at the same time, the bending of the wires can be prevented from being concentrated at a specific place, and the circuit breaker can be reduced in size, low in price, and high in performance.

Description of drawings

FIG. 1 is a cross-sectional view showing a schematic configuration of a circuit breaker according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a schematic configuration around a flexible lead wire of the circuit breaker shown in Fig. 1 .

Fig. 3 is a cross-sectional view showing an open state of the circuit breaker of Fig. 1 .

Fig. 4 is a cross-sectional view showing a schematic configuration of a conventional circuit breaker.

Symbol Description

1-fixed contact; 2-fixed contact; 3-movable contact; 4, 4'-movable contact; 5-movable contact support frame; 6-crimping spring; 7-wire: 8-movable Pieces shaft pin; 9-connecting plate; 10-current detection part; 11-opening and closing mechanism part; 12-handle.

Detailed ways

The circuit breaker according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

1 is a cross-sectional view showing a schematic configuration of a circuit breaker according to an embodiment of the present invention, FIG. 2 is a perspective view showing a schematic configuration around a flexible lead wire of the circuit breaker shown in FIG. 1 , and FIG. 3 shows the circuit shown in FIG. 1 . Cross-sectional view of the open state of the circuit breaker.

In FIG. 1, a movable contact 4 and a fixed contact 1 are provided in a circuit breaker, a movable contact 3 is provided at the front end of the movable contact 4, and a fixed contact is provided at the fixed contact 1. 2. In addition, in the circuit breaker, a movable contact support frame 5 for supporting the movable contact 3 is provided. Moreover, the movable contact 4 is configured to be able to rotate around the movable member shaft pin 8, so that the movable contact 3 can contact the fixed contact 2, or leave the fixed contact 2, and move toward the fixed contact through the compression spring 6. 2 direction empowerment. Here, the movable element shaft pin 8 is held by the movable contact support frame 5 made of resin, and the movable contact 3 and the fixed contact 2 are brought into pressure contact by using the pressure contact spring 6 . The rotating shaft of the movable contact support frame 5 is disposed coaxially with the movable element shaft pin 8 .

The flexible wire 7 is connected to the rear end of the movable contact 4 , and the movable contact 4 is connected to the connecting plate 9 through the wire 7 . In the circuit breaker, an opening and closing mechanism section 11 connected to the movable contact support frame 5 is provided. In addition, the opening/closing mechanism part 11 can rotate the movable contact support frame 5 during an opening operation according to the operation of the handle 12 or the current detection result of the current detection part 10 .

In addition, the opening and closing circuits of multiple poles are housed in one frame, and the opening and closing circuits of one pole can be opened and closed by a pair of contacts. And, the movable contact 4 of each phase is supported so as to be rotatable independently for each phase by a single movable contact support frame 5 which is rotatably supported.

Here, the lead wire 7 is wired and wound around the movable member shaft pin 8, and the joint position between the lead wire 7 and the movable contact 4 can be set so that the displacement of the lead wire 7 due to the rotation of the movable contact 4 Changes in the bending radius through the wire 7 are absorbed. For example, the lead wire 7 is wound around the movable element pin 8 by more than 1/2 turn, and can be routed so as to be drawn out substantially along a tangential direction relative to the rotation track of the junction between the lead wire 7 and the movable contactor 4 .

Specifically as shown in Figure 2, the wires 7 are arranged on both sides of the movable contact 4, wound on the movable member shaft pin 8, including the part away from the movable member shaft pin 8, and can be wound on the movable member About 3/4 circle on axle pin 8.

In addition, when a current flows to the load through the connecting plate 9, as shown in FIG. This closes the movable contact 3 and the fixed contact 2. And, if the movable contact 3 and the fixed contact 2 are closed, the current flows to the load through the path of fixed contact 1→fixed contact 2→movable contact 3→movable contact 4→wire 7→connecting plate 9.

On the other hand, in the case of breaking the short-circuit current or the load current, as shown in FIG. As a result, the movable contact 4 rotates in the direction opposite to the fixed contact 2 side, and the movable contact 3 separates from the fixed contact 2 to disconnect the current flowing to the load.

Here, the lead wire 7 is wound on the movable member shaft pin 8 for more than 1/2 turn, and the lead wire 7 is routed so that the rotation track of the junction of the lead wire 7 and the movable contact 4 is basically drawn out along the tangential direction. It is not necessary to arrange the lead wire 7 to extend linearly under the movable contact support frame 5, and the movable contact 4 can be rotated while slightly changing the bending outer diameter of the lead wire 7 without compressing the lead wire in the longitudinal direction. 7. The displacement of the wire 7 caused by the rotation of the movable contact 4 can be absorbed by the wire 7 . Therefore, the space necessary for arranging the lead wire 7 can be reduced, and at the same time, the rotational movement angle of the movable contact 4 can be increased without increasing the length of the movable contact 4, and the necessary contact interval can be ensured at the time of disconnection. Realize the compactness of the circuit breaker.

In addition, the displacement of the lead wire 7 due to the rotation of the movable contactor 4 can be distributed over the entire lead wire 7, so that the bending of the lead wire 7 can be prevented from concentrating on a specific position. Therefore, it is possible to use the lead wire 7 of a thicker raw material wire, it is less susceptible to corrosion etc., and the price can be suppressed.

For example, in the example of the prior art shown in Fig. 4, use the wire 107 of flexible length 39mm, can only ensure that the rotation angle of movable contact 104 when opening and closing is about 13 degrees, and in Fig. In the embodiment of the invention, by using the wire 7 with a length of 36mm, the rotation angle of the movable contacts 4 and 4' during opening and closing can be ensured to be more than 26 degrees, and the operating angle can be doubled. Therefore, the space for the lead wire 7 can be reduced and the length of the movable contact 4 can be shortened, so that the circuit breaker can be miniaturized.

In addition, in the example of the prior art shown in Fig. 4, the lead wire 107 is constituted by an ultra-thin wire with a raw material diameter of 0.05 mm, while in the embodiment of the present invention shown in Fig. 1, the raw material diameter is 0.1 mm. The wires constituting the wire 7 can absorb the action of the wire 7 effortlessly, and the price of the wire 7 can be reduced.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-described embodiments. Various changes can be made within the scope of the technical thought of the present invention, and they all belong to the protection scope of the present invention.

Claims (3)

1. a circuit-breaker is characterized in that, comprising:

Be provided with the fixed contact of fixed contact;

Be provided with the movable contact of the travelling contact that can open and close with described fixed contact;

The flexible lead that connects described movable contact and connecting plate; With

The movable contact bearing support keeps described movable contact so that described movable contact can rotate around rotating shaft, wherein,

Described lead connected up make on its rotating shaft that is wound on described movable contact, reeling on the rotating shaft of described movable contact more than 1/2 week with described lead, and it is connected up make the mode that the swing-around trajectory at junction surface of described relatively lead and described movable contact is drawn along tangential direction substantially, set the position, junction surface of described lead and described movable contact, make the displacement of the described lead that rotation along with described movable contact causes change and absorb by the bending radius of described lead.

2. circuit-breaker as claimed in claim 1 is characterized in that:

Described lead forms U word shape, and is open with the contact opposition side of movable contact.

3. as each described circuit-breaker in the claim 1～2, it is characterized in that:

Be configured and make the rotating shaft of described movable contact bearing support and the rotating shaft coaxle of described movable contact.

Images