JP2016062715A - Contact device, tripping device and circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device, a tripping device and a circuit breaker that can suppress an assembling cost and enhance durability.SOLUTION: A contact device 100 has a circuit board 1, stationary contacts 2a, 2b provided to the circuit board 1, and a link mechanism 3 having a movable contact 35 that is freely detachably brought into contact with the stationary contacts 2a, 2b to conduct the stationary contacts 2a, 2b to each other. The stationary contacts 2a, 2b have contact portions 22a, 22b which are away from the circuit board 1, and contact the movable contact 35, respectively. The link mechanism 3 moves the movable contact 35 in connection with the operation of a handle portion 31, thereby performing a switching operation between a close-circuit state under which the contact portions 22a, 22b of the stationary contacts 2a, 2b are conducted to each other and an open-circuit state under which they are not conducted to each other. When the stationary contacts 2a, 2b are brought into contact with the movable contact 35, the stationary contacts 2a, 2b are elastically deformed to the opposite side to the confronting faces to the movable contact 35.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a contact device, a trip device, and a circuit breaker.

  2. Description of the Related Art Conventionally, there are circuit breakers in which circuit contacts are provided on a stationary contact and a movable contact, respectively. (For example, see Patent Document 1)

JP 2002-216612 A

  However, in the device described in Patent Document 1, since the contact of the circuit is provided on the fixed contact and the movable contact, respectively, it is necessary to attach a lead wire to connect the movable contact to the circuit. When the lead wire is attached, it is necessary to form the lead wire so as not to hinder the operation of the movable contact, and the number of assembling steps is increased, so that the assembly cost of the contact device increases. Further, when the movable contact is provided on the printed circuit board, the operation of the movable contact causes a stress crack in a portion fixed by the movable contact, the printed circuit board, and the solder, resulting in low durability.

  Therefore, the present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a contact device, a trip device, and a circuit breaker that can reduce assembly cost and increase durability.

  The contact device of the present invention includes a circuit board, a plurality of fixed contacts provided on the circuit board, and a link mechanism having a movable contact that is detachably contacted with the plurality of fixed contacts and is electrically connected to each other. A plurality of fixed contacts are separated from the circuit board and have contact portions that come into contact with the movable contacts, and the link mechanism moves the movable contacts in accordance with the operation of the handle portion, thereby Switching between a closed state in which the contact portions of the fixed contact are electrically connected to each other and an open state in which the contact is not connected is performed, and when the fixed contact is in contact with the movable contact, it is elastic to the opposite side of the surface contacting the movable contact. It is characterized by being deformed.

  The tripping device of the present invention includes the contact device.

  The circuit breaker of the present invention includes the contact device.

  The contact device, trip device, and circuit breaker of the present invention can reduce assembly costs and improve durability by providing circuit contacts on a stationary contact.

FIG. 1 is a side view showing the configuration of the contact device according to the first embodiment. FIG. 2 is a front view of the stationary contact of the contact device according to the first embodiment. FIG. 3 is a front view of another example of the fixed contact of the contact device according to the first embodiment, and (a), (b), and (c) are front views of an example of the fixed contact, respectively. 4A and 4B are operation explanatory views of the contact device according to the first embodiment. FIG. 4A is a side view showing the contact device in an open state, and FIG. 4B is a side view showing the contact device in a closed state. FIG. 5 is a side view showing the configuration of the contact device according to the second embodiment. FIG. 6 is a front view showing the configurations of the tripping device and the circuit breaker according to the first and second embodiments.

(Embodiment 1)
Hereinafter, the contact device 100 according to the first embodiment will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a side view showing the configuration of the contact device 100. As shown in FIG. 1, the contact device 100 includes a circuit board 1, a plurality of fixed contacts 2 provided on the circuit board 1, and a movable contact that allows the fixed contacts 2 to be detachably contacted to each other. A link mechanism 3 having a contact 35 and a cover 4 are provided. The circuit board 1, the fixed contact 2, and the link mechanism 3 are arranged in the space of the cover 4.

  The fixed contact 2 is divided into two, fixed contacts 2a and 2b, each having a contact portion 22a and 22b which is separated from the circuit board 1 and is in contact with the movable contact 35. They are arranged side by side as in the horizontal direction. The number of fixed contacts 2 is not particularly limited. For example, when there are three circuit contacts, three fixed contacts 2 may be provided.

  The link mechanism 3 moves the movable contact 35 in accordance with the operation of the handle portion 31, thereby causing a closed state in which the contact portions 22a, 22b of the fixed contacts 2a, 2b are electrically connected to each other and an open state in which the contact portions 22a, 22b are not electrically connected. Switch.

  The fixed contacts 2 a and 2 b have elasticity, and when they are brought into contact with the movable contact 35, they are elastically deformed to the opposite side of the surface in contact with the movable contact 35.

  Hereinafter, the configuration of the link mechanism 3 will be described with reference to FIG.

  As shown in FIG. 1, the link mechanism 3 includes a handle portion 31, a thrust bar 32, a latch member 33 having a protrusion 331, a movable link 34, a movable contact 35, and an interlocking piece 36.

  The handle part 31 includes a columnar rotation part 311 having a connection hole 313 and an operation part 312. The rotation unit 311 rotates about a first rotation shaft 41 provided on the cover 4. The handle portion 31 rotates about the first rotation shaft 41 when the operation unit 312 is operated. Hereinafter, the direction in which the handle portion 31 rotates to change the circuit from the open state to the closed state will be described as direction B.

  The latch member 33 and the movable link 34 rotate around a second rotation shaft 42 provided on the cover 4. The latch member 33 and the movable link 34 form a link hole 341.

  The movable link 34 is constantly given a biasing force that rotates in the direction opposite to the direction B by the drive spring 51. One end of the drive spring 51 is locked to the cover 4. The other end of the drive spring 51 is locked to the movable link 34.

  The latch member 33 is constantly applied with an urging force that rotates in the direction B by the latch spring 52. One end of the latch spring 52 is locked to the cover 4. The other end of the latch spring 52 is locked to the latch member 33.

  The movable link 34 is always given a biasing force that rotates in the direction opposite to the direction B by the drive spring 51, and the latch member 33 is always given a biasing force that rotates in the direction B by the latch spring 52. The shape of the link hole 341 is always maintained.

  The thrust bar 32 is formed in a U shape by a metal round bar. The operation side end portion 321 of the thrust bar 32 is inserted into the connection hole 313 of the handle portion 31. The transmission side end 322 of the thrust bar 32 is disposed in a link hole 341 formed by the movable link 34 and the latch member 33. This state is a state where the thrust bar 32 is latched by the latch member 33 (latched state). In this latched state, the movement of the handle portion 31 is transmitted to the movable link 34 via the thrust bar 32.

  The movable contact 35 is supported by a moving shaft 44 provided on the movable link 34 and is held by the movable link 34 via the moving shaft 44. For this reason, the movable contact 35 rotates around the second rotation shaft 42 as the movable link 34 rotates.

  The method for holding the movable contact 35 on the movable link 34 is not particularly limited. For example, the movable contact 35 and the movable link 34 may be fixed to each other through a fitting groove, or the movable contact 35 and the movable link 34 may be integrally formed. By integrally forming the movable contact 35 and the movable link 34, the assembly man-hour of the contact device can be suppressed, and the assembly cost can be suppressed.

  With the above configuration, the link mechanism 3 can rotate the movable contact 35 along the circuit board 1 in accordance with the operation of the handle portion 31.

  The interlocking piece 36 is supported so as to be rotatable about a third rotation shaft 43 provided on the cover 4. The interlocking piece 36 has an interlocking rod 361. One end of the interlocking rod 361 is fixed to the interlocking piece 36, the other end protrudes to the outside from a slit (not shown) of the cover 4, and is connected to another device, for example, the interlocking piece 37 of the circuit blocking unit 130 described later.

  Hereinafter, the configuration of the stationary contact 2 will be described with reference to FIGS. 2 and 3.

  FIG. 2 is a front view of the stationary contact 2 of the contact device 100. The direction A of the arrow in FIG. 2 is the direction in which the movable contact 35 rotates to change the circuit from the open circuit state to the closed circuit state.

  As shown in FIG. 2, the stationary contact 2 is a metal piece having elasticity, and extends in the direction A in which the movable contact 35 moves to have an elongated shape. The stationary contact 2 is bent so that the guide piece 21, the contact piece 22 that is separated from the circuit board 1 and becomes a contact portion, and the side portion 23 are continuous. The fixed contact 2 preferably has an elongated shape in the direction A in which the movable contact 35 moves, but is not limited thereto.

  The guide piece portion 21 has an inclined surface 211 that is inclined with respect to the circuit board, and guides the movement of the movable contact 35 to the contact piece portion 22 when the open piece state is switched to the closed state.

  The contact piece 22 has a contact surface 221 that contacts the movable contact 35 and is substantially parallel to the direction A in the front view shown in FIG. At this time, when the movable contact 35 is in contact with the contact surface 221, the movable contact 35 is rotated along the contact surface 221, so that the movable contact 35 is in contact with the contact piece 22 during the process. The surface in contact with the contact piece 22 and the contact surface 221 of the contact piece 22 can be polished together. Therefore, the contact reliability of the contact device 100 can be improved by removing the participating film and dirt that inhibit the contact.

  The side portion 23 has an inclined surface 231 that is inclined with respect to the circuit board 1 in a direction opposite to the inclined surface 211.

  The stationary contact 2 is elastically deformed so that the contact piece 22 approaches the circuit board when the movable contact 35 is contacted.

  In addition, although the contact surface 221 was shown with the plane, it is not limited to it. For example, the contact surface 221 and the surface that contacts the contact piece 22 of the movable contact 35 may be combined to form a curved surface. For example, the contact position of the contact surface 221 can be stabilized by making the contact surface 221 and the surface that contacts the contact piece 22 of the movable contactor 35 into a curved surface that protrudes to the opposite side of the circuit board 1.

  In addition, the inclination of the inclined surface 231 with respect to the circuit board 1 is preferably larger than the inclined surface 211, but is not limited thereto. By making the inclination of the inclined surface 231 with respect to the circuit board 1 larger than that of the inclined surface 211, the dimension in the longitudinal direction in the direction A of the stationary contact 2 can be reduced, which can contribute to the miniaturization of the mechanism. .

  The fixed contact 2 is fixed on the circuit board 1 via the guide piece 21 and is connected to the circuit of the circuit board 1, but is not limited thereto. For example, the fixed contact 2 may be fixed on the circuit board 1 via the side part 23 or both the guide piece part 21 and the side part 23 and connected to the circuit of the circuit board 1.

  The fixed contact 2 may be a bent plate-shaped metal piece. At this time, the contact piece 22 is substantially parallel to the circuit board 1.

  FIG. 3 is a front view of another example of the stationary contact 2. In FIG. 3A, a part of the side surface 211 of the guide piece 21 of the fixed contact 2 is an inclined surface with respect to the circuit board 1, and the side 231 of the side part 23 of the fixed contact 2 is the circuit board 1. It is an example which is a perpendicular surface with respect to.

  3B, the side surface 211 of the guide piece portion 21 of the fixed contact 2 is an inclined surface that swells with respect to the circuit board 1, and the side surface 231 of the side portion 23 of the fixed contact 2 is perpendicular to the circuit board 1. FIG. It is an example which has a surface and is provided apart from the circuit board 1.

  FIG. 3C is an example in which the side surface 211 of the guide piece portion 21 of the fixed contact 2 is an inclined surface that is recessed with respect to the circuit board 1, and the side portion 23 is not provided on the fixed contact 2. At this time, it is preferable to provide a surface that smoothly connects the side surface 211 and the contact surface 221 as indicated by the arrow C so that the movable contact 35 can smoothly contact the fixed contact 2.

  In addition, the example of the side surfaces 211 and 231 of the stationary contact 2 is not limited to the example illustrated in FIG. 3. For example, the side surfaces 211 and 231 illustrated in FIG. 3 may be combined.

  Since the fixed contact 2 has the guide piece portion 21, the movable contact 35 can smoothly move to the contact piece portion 22 when the movable contact 35 rotates to change the circuit from the open circuit state to the closed circuit state.

  Hereinafter, the operation of the contact device will be described with reference to FIG.

  FIG. 4 is an operation explanatory diagram of the contact device 100. FIG. 4A is a side view showing the contact device in the open state, and FIG. 4B is a side view showing the contact device in the closed state. In the following description, the position of the handle portion 31 in the open state is referred to as the off position, and the position of the handle portion 31 in the closed state is referred to as the on position.

  First, the operation when the handle portion 31 is rotated to change the contact device 100 from the open state shown in FIG. 4A to the closed state shown in FIG. 4B will be described.

  As shown in FIG. 4A, when the handle portion 31 is rotated from the off position toward the on position (in the direction B), the movable link 34 is pushed by the thrust bar 32, and the movable link 34 is It rotates about the second rotation shaft 42.

  At this time, the movable contact 35 held by the movable link 34 rotates in the direction A about the second rotation shaft 42 as the movable link 34 rotates about the second rotation shaft 42. .

  And when the handle | steering-wheel part 31 rotates to an ON position as shown in FIG.4 (b), the movable contact 35 contacts the fixed contact 2 and connects the fixed contacts 2a and 2b, and a circuit is obtained. Is closed. At this time, the fixed contact 2 has elasticity, and when it is brought into contact with the movable contact 35, it is elastically deformed to the opposite side of the surface in contact with the movable contact 35. The contact between the movable contact 35 and the fixed contact 2 can be stabilized by the repulsive force.

  In addition, the latch member 33 receives the urging force of the latch spring 52 and rotates to a position where it comes into contact with the transmission side end 322 side of the thrust bar 32. The interlocking piece 36 rotates in accordance with the rotation of the movable link 34, and displaces another device, for example, the interlocking piece 37 of the circuit interrupting unit 130 described later in accordance with the operation of the interlocking rod 361.

  Next, the operation when the handle portion 31 is rotated to change the contact device 100 from the closed state shown in FIG. 4B to the open state shown in FIG. 4A will be described.

  As shown in FIG. 4B, when the handle portion 31 is rotated from the on position to the off position (direction B ′ which is the reverse direction of the direction B), the latch member 33 is pulled by the thrust bar 32. . The latch member 33 rotates in the direction B ′ against the urging force of the latch spring 52, and the link hole 341 is opened upward. The movable link 34 receives the biasing force of the drive spring 51 and rotates in the direction B ′.

  At this time, as the movable link 34 rotates, the movable contact 35 held by the movable link 34 rotates about the second rotation shaft 42 in the direction A ′ which is the reverse direction of the direction A.

  And when the handle | steering-wheel part 31 rotates to an OFF position as shown to (a) of FIG. 4, the circuit will be made into an open circuit state because the movable contact 35 leaves | separates from fixed contact 2a, 2b. Further, the interlocking piece 36 is rotated in the direction B ′ by being pushed by the protrusion 331 of the latch member 33, and the interlocking piece of another device, for example, a circuit interrupting unit 130 to be described later with the operation of the interlocking rod 361. 37 is displaced.

  Hereinafter, the configuration of the tripping device 110 and the circuit breaker 120 will be described with reference to FIG. FIG. 6 is a front view of the trip device 110 and the circuit breaker 120.

As shown in FIG. 6, the tripping device 110 includes a contact device 100 and an electromagnetic tripping device 90. The electrical trip device 90 drives the movable link 34 when the voltage of the circuit becomes higher than a predetermined voltage. When the movable link 34 is driven by the electromagnetic trip device 90 and the movable link 34 and the latch member 33 are relatively rotated, the link hole 341 is opened. Then, the transmission side end 322 of the thrust bar 32 protrudes outside the link hole 341, and the latch of the thrust bar 32 is released (latched release state). At this time, since the link mechanism 3 is driven by the electromagnetic trip device 90, the movable contact 35 is moved from the contact portion 22 of the fixed contact 2.
Is tripped and the circuit can be opened.

  The electromagnetic trip device 90 may operate when the voltage drops below a predetermined voltage or when an external signal is received.

  The circuit breaker 120 includes a trip device 110 having a contact device 100 and a circuit breaker 130. The circuit breaker 130 has an interlocking piece 37 that is displaced in accordance with the operation of the interlocking rod 361 of the contact device 100, and interlocks with the operation of the contact device 100. Further, the handle portion 38 of the circuit breaker 130 is interlocked with the handle portion 31 of the contact device 100 via the interlocking portion 314.

  The electromagnetic trip device 90 is not necessarily provided in the trip device 110, and may be provided in the circuit interrupting unit 130, for example. At this time, the circuit breaker 120 includes the contact device 100 and a circuit breaker 130 having an electromagnetic trip device 90.

  In the contact device 100, the trip device 110, and the circuit breaker 120, the circuit contacts of the circuit board 1 are provided on the fixed contacts 2a and 2b, so that the circuit contacts need not be provided on the movable contact 35. Therefore, the contact device 100 does not need to be provided with a lead wire for connecting the movable contact 35 to the circuit, and is fixed on the circuit board 1 with solder in order to electrically connect the movable contact 35 to the circuit board 1. Since there is no need to do this, assembly costs can be reduced and durability can be increased.

  In the circuit breaker disclosed in Patent Document 1, when the movable contact is rotated by the vertical movement of the crossbar, the contact portion between the crossbar and the movable contact is consumed or deformed.

  On the other hand, in the contact device 100, the trip device 110, and the circuit breaker 120, the movable contact 35 is held by the movable link 34 and is rotated as the movable link 34 is rotated. It is difficult for wear or deformation to occur at the portion where 35 and the movable link 34 come into contact with each other. Therefore, the contact device 100 can have higher durability than that described in Patent Document 1.

  The circuit breaker described in Patent Document 1 arranges the circuit boards in tandem with the link mechanism so that the crossbar provided in the link mechanism (opening / closing mechanism) moves up and down relative to the circuit board (printed board). Therefore, the depth of the circuit breaker is large. Therefore, the thing of patent document 1 has a problem which is not suitable for a thin earth-leakage circuit breaker with a small depth.

  On the other hand, in the contact device 100, the trip device 110, and the circuit breaker 120, the link mechanism 3 uses the handle portion 31 to rotate the movable contact 35 along the circuit board 1, whereby the contact device The depth of 100 and the circuit breaker can be reduced and made thinner.

In addition, about operation | movement of the link mechanism 3, the movable contact 35 is not limited to rotating centering on the 2nd rotating shaft 42 with operation of the handle | steering-wheel part 31. FIG. For example, the movable contact 35 may be configured to connect the contact portions 22a and 22b by sliding in the longitudinal direction in accordance with the operation of the handle portion 31.
(Embodiment 2)
Hereinafter, the contact device 200, the tripping device 210, and the circuit breaker 220 according to Embodiment 2 of the present invention will be described with reference to FIGS. The contact device 200 is mainly different from the contact device 100 in the arrangement of the plurality of fixed contacts 2. In addition, about the structure similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted suitably.

  FIG. 5 is a side view showing the configuration of the contact device 200. FIG. 6 is a front view showing the configuration of the circuit breaker 220.

  As shown in FIG. 5, the contact device 200 has the fixed contact 2 c, 2 d shifted in the longitudinal direction so that the movable contact 35 rotates in the A direction first. After being in contact with the contact portion 22c, the contact portion 22d of the fixed contact 2d is disposed on the circuit board 1 so as to contact. At this time, when the circuit is changed from the closed state to the open state, the movable contact 35 is first separated from the contact portion 22d of the fixed contact 2d, and then is separated from the contact portion 22c of the fixed contact 2c.

  In the contact device 200, the trip device 210, and the circuit breaker 220, the fixed contacts 2c and 2d are arranged on the circuit board 1 while being displaced from each other in the longitudinal direction thereof, so that the movable contact 35 is connected to the circuit. Since the contact portion 22d of the fixed contact 2c is separated from the contact portion 22d of the fixed contact 2d first, the arc of the fixed contact 2c can be suppressed. . Further, when the movable contactor 35 changes the circuit from the open circuit state to the closed circuit state, it first contacts the contact part 22c of the fixed contactor 2c and then contacts the contact part 22d of the fixed contactor 2d to close the circuit. Therefore, the generation of the arc of the fixed contact 2c can be suppressed. Therefore, the fixed contact 2c may be a material with low durability.

  In addition, when the movable contact 35 rotates in the A direction, the fixed contacts 2c and 2d first come into contact with the contact portion 22d of the fixed contact 2d and then contact the contact portion 22c of the fixed contact 2c. As such, it may be arranged on the circuit board 1. At this time, generation | occurrence | production of the arc of the fixed contact 2d can be suppressed.

In addition, in order to obtain the above-described effect, the lengths of the fixed contacts 2c and 2d in the longitudinal direction may be different.
(Conclusion)
As described above, the embodiments have been described as examples of the technology in the present invention. For this purpose, the accompanying drawings and detailed description are provided.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this invention, a various change, replacement, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

100, 200 Contact device 110, 210 Trip device 120, 220 Circuit breaker 1 Circuit board 2 (2a, 2b, 2c, 2d) Fixed contact 21 Guide piece 211 Inclined surface (side surface)
22 (22a, 22b, 22c, 22d) Contact part (contact piece part)
221 Contact surface 3 Link mechanism 31 Handle portion 33 Latch member 34 Movable link 35 Movable contact 4 Cover 42 Second rotation axis (predetermined axis)

Claims (8)

A circuit board;
A plurality of fixed contacts provided on the circuit board;
A link mechanism having a movable contact that removably contacts the plurality of fixed contacts and is electrically connected to each other; and
The plurality of fixed contacts have a contact portion that is separated from the circuit board and contacts the movable contact,
The link mechanism is configured to switch between a closed state where the contact portions of the plurality of fixed contacts are electrically connected to each other and an open state where the contact portions are not electrically connected, by moving the movable contact in accordance with an operation of a handle portion.
The contact device is characterized in that when the fixed contact is brought into contact with the movable contact, it is elastically deformed to the opposite side of the surface in contact with the movable contact. The link mechanism further has a predetermined axis,
The contact device according to claim 1, wherein the movable contact is rotated about the predetermined axis in accordance with an operation of the handle portion. The contact device according to claim 2, wherein the link mechanism rotates the movable contact along the circuit board in accordance with an operation of the handle portion. The stationary contact is a metal piece having elasticity,
The movable contact is moved to the contact piece when the contact piece is separated from the circuit board and becomes the contact portion, and is inclined with respect to the circuit board and is switched from the open state to the closed state. The guide piece that guides the movement is bent so as to be continuous,
The contact device according to claim 1, wherein the contact piece is elastically deformed so as to approach the circuit board when the movable contact is brought into contact. The stationary contact is a bent plate-shaped metal piece,
The contact device according to claim 4, wherein the contact piece has a length substantially parallel to the circuit board. The plurality of fixed contacts extend in a direction in which the movable contact moves, and are arranged on the circuit board while being displaced from each other in the longitudinal direction thereof. The contact device described. A tripping device comprising the contact device according to any one of claims 1 to 6. A circuit breaker comprising the contact device according to claim 1.