JP5407654B2 - Magnetic contactor - Google Patents

Description

  The present invention relates to an electromagnetic contactor that reduces noise during an opening / closing operation.

  For example, in the electromagnetic contactor of Patent Document 1, a contact portion and an electromagnet that opens and closes the contact portion by a suction operation are accommodated in a case in parallel. The contact portion is arranged in a case that is movable by an electromagnet operation, a return spring that returns the movable contact support to an initial position, a plurality of movable contacts arranged on the movable contact support, and a case facing each movable contact. Fixed contacts. The electromagnet includes an exciting coil, a fixed core, and a movable core disposed so as to be able to contact and separate from the fixed core. The movable core is attracted to the fixed core by the excitation coil and moves toward the fixed core to move. When the movable contact support is driven by the movement of the core, the corresponding movable contacts and fixed contacts are opened and closed.

  In the electromagnetic contactor of Patent Document 1, a collision buffer portion is integrally formed on a spool around which a winding of an exciting coil is wound, and before the movable core moved by the excitation of the exciting coil collides with the fixed core. The collision buffer is brought into contact with the movable core support that supports the movable core, and the collision force of the movable core that collides with the fixed core is weakened to reduce the collision noise, thereby achieving low noise.

JP-A-7-105815

However, the electromagnetic contactor disclosed in Patent Document 1 has a problem in terms of durability of components constituting the electromagnetic contactor because the collision buffering portion collides with the movable core support inside the apparatus.
Moreover, since the collision buffer part for reducing a collision sound is arrange | positioned inside the apparatus (spool), patent document 1 achieves low noise by retrofitting with respect to a completed electromagnetic contactor. Can not.

  Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and can improve the durability of the parts without applying a collision force to the constituent parts of the magnetic contactor, and the finished product. It aims at providing the electromagnetic contactor which can achieve noise reduction by retrofit.

In order to achieve the above object, in an electromagnetic contactor according to the present invention, a contact portion and an electromagnet are accommodated in a casing in parallel, and the contact portion includes a movable contact support and a plurality of contacts disposed on the movable contact support. Movable contacts, and fixed contacts arranged so as to be able to come into contact with and away from the movable contacts. The electromagnet is integrated with the exciting coil, the fixed core, and the movable contact support so as to be able to come into contact with and separate from the fixed core. The movable core is opposed to the movable core, and the movable core is attracted to the fixed core by excitation of the excitation coil, and the movable contact support moves together with the movable core, thereby opening and closing the corresponding movable contact and fixed contact. In the electromagnetic contactor that performs, a collision buffer device that reduces a collision sound when the movable contact contacts the fixed contact and a collision sound when the movable core is attracted to the fixed core during an opening / closing operation, Externally to Kikatami body, the connecting lever integral to the movable contact support is, protrudes to the outside from a portion of said housing, said impact attenuator, and a buffer material, towards this cushioning material stroke A shock-absorbing material abutting member, and an opening / closing operation transmitting portion that is connected to the connecting lever and transmits the movement of the movable contact support to the shock-absorbing material abutting member. The stroke until contact is set shorter than the stroke until the movable contact contacts the fixed contact.

According to the present invention, the collision buffering device reduces the collision sound when the movable contact contacts the fixed contact and the collision sound when the movable core is attracted to the fixed core during the opening / closing operation. Noise reduction.
Further, since the impact buffering device is externally attached to the housing, the noise can be reduced even with respect to the finished electromagnetic contactor.

In addition, according to the present invention, by providing the collision buffer device having a simple structure, it is possible to reduce the manufacturing cost of the collision buffer device and the electromagnetic contactor.
Furthermore, the electromagnetic contactor according to the present invention is a member in which the cushioning material is elastically deformable, and a decrease in the operation speed of the cushioning material abutting member in contact with the cushioning material is caused by the opening / closing motion transmission unit and the It is transmitted to the movable contact support via a connecting lever.

  According to the present invention, the decrease in the operating speed of the cushioning material abutting member that is in contact with the elastically deformable cushioning material of the collision buffering device is directly transmitted to the movable contact support, and the movable contact whose operating speed is reduced becomes the fixed contact. The impact sound can be reduced by contact. Further, the movement of the movable contact support whose operating speed is reduced is directly transmitted to the movable core, and the movable core whose operating speed is reduced is attracted and held by the fixed core, so that the collision noise can be reduced.

  Further, according to the present invention, no collision force is applied to the components of the electromagnetic contactor, and no large collision force is generated inside the collision buffer device, so that the durability of the electromagnetic contactor and the collision buffer device is improved.

  According to the electromagnetic contactor according to the present invention, the collision buffering device reduces the collision sound when the movable contact during the opening / closing operation contacts the fixed contact and the collision sound when the movable core is attracted to the fixed core. Noise reduction during operation of the magnetic contactor can be achieved. Further, since the impact buffering device is externally attached to the housing, the noise can be reduced even with respect to the finished electromagnetic contactor.

It is a perspective view which shows the collision buffer device externally attached to the electromagnetic contactor apparatus which concerns on this invention. It is sectional drawing which shows the internal structure of the magnetic contactor to which the collision shock absorber was externally attached. It is a figure which shows the structure of the contact part of an electromagnetic contactor. It is sectional drawing which shows the internal structure of a collision buffering device. It shows the relationship between the stroke of the movable contact that moves toward the normally open fixed contact of the main circuit terminal and the biasing force of the contact spring that biases the movable contact. The relationship between the stroke of a movable contact and an operating speed is shown.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
As shown in FIG. 1, a collision buffer 2 is externally attached to the electromagnetic contactor 1 of the present embodiment.
The electromagnetic contactor 1 includes a lower case 3, an upper case 4 and a cover 5 formed of an insulating synthetic resin material. The upper case 4 has terminal portions 10 a to 10 d each having a contact and an electromagnet 8 which will be described later. The coil terminal 11 is fixed, and the contact portion 7 is accommodated in the upper case 4.

An electromagnet 8 and a drive lever 9 for driving the contact portion 7 are housed in the lower case 3, and the cover 5 covering the upper portion of the upper case 4 is engaged with a part of the contact portion 7. A shock absorber 2 is mounted.
The cover 5 is formed with a rectangular window 5a and a plurality of connecting holes 5b into which the collision buffer 2 is detachably attached.

  As shown in FIG. 2, the electromagnet 8 includes a spool 8b around which an exciting coil 8a is wound, a plunger 8c inserted into a hollow portion of the spool 8b, an armature 8d fixed to one end of the plunger 8c, An inner yoke 8e disposed so as to surround the outer periphery of the spool 8b, an outer yoke 8f disposed outside the inner yoke 8e by a predetermined distance and surrounding the spool 8b, and between the inner yoke 8e and the outer yoke 8f. And an armature 8d fixed to one end side of the plunger 8c is a direct-current operation type electromagnet disposed between the inner yoke 8e and the outer yoke 8f. In the electromagnet 8, when the exciting coil 8a is excited in the opposite polarity to the permanent magnet, an attractive force acts between the armature 8d and the outer yoke 8f, and the plunger 8c is driven to the left in FIG. It is attracted to the outer yoke 8f.

The drive lever 9 is fixed to the other end of the plunger 8 c of the electromagnet 8, extends toward the upper case 4, and engages with the movable contact support 7 a of the contact portion 7 housed in the upper case 4. ing.
As shown in FIGS. 2 and 3, the contact portion 7 includes a movable contact support 7a disposed between terminal portions 10a to 10d each having contacts arranged in a row, and the movable contact support 7a. And a return spring 7b biased in the direction.

  As shown in FIG. 3, the terminal portions 10a to 10d each having contacts arranged in a row are provided with contact pieces 12 projecting toward the movable contact support 7a, and the contact pieces of the terminal portions 10a and 10b. A normally open fixed contact TNO is formed on one side surface (the right side surface in FIG. 3) of the tip of 12. A normally closed fixed contact TNC is formed on the other side surface (left side surface in FIG. 3) of the tip of the contact piece 12 of the terminal portions 10c and 10d.

The movable contact support 7a is a member made of a synthetic resin material extending in a direction in which the terminal portions 10a to 10d each having a contact are arranged in a row, and a plurality of partition walls 13 are formed at predetermined intervals. In addition, movable contacts 7c1 to 7c4 are supported between the partition walls 13.
The movable contacts 7c1 and 7c2 are opposed to the normally open fixed contact TNO of the terminal portions 10a and 10b, and are urged by the contact spring 14 in a direction away from the partition wall 13. The movable contacts 7c3 and 7c4 are opposed to the normally closed fixed contacts TNC of the terminal portions 10c and 10d, and are urged by a contact spring 14 in a direction away from the partition wall 13.

  A return spring 7b is arranged at one end in the longitudinal direction of the movable contact support 7a. When the exciting coil 8a is not excited, the movable contacts 7c1 and 7c2 become the normally open fixed contacts TNO of the terminal portions 10a and 10b. The movable contact support 7a is urged in one direction by the urging force of the return spring 7b so that the movable contacts 7c3 and 7c4 are separated and come into contact with the normally closed fixed contact TNC of the terminal portions 10c and 10d.

Further, as shown in FIG. 2, a connecting lever 7d is integrally formed on the movable contact support 7a, protrudes into a rectangular window 5a formed on the cover 5, and moves along with the movement of the movable contact support 7a. It moves in the longitudinal direction of 5a.
On the other hand, as shown in FIG. 4, the collision shock absorber 2 includes a device case 2 a that is detachably mounted on the cover 5, a first shock absorber 2 b that includes elastic members that are spaced apart from each other in the device case 2 a, and The second cushioning material 2c, the cushioning material abutting member 2e disposed in the stroke space 2d provided between the first cushioning material 2b and the second cushioning material 2c, and the movable projecting into the window 5a of the cover 5 An opening / closing operation transmitting portion 2f that is connected to the connecting lever 7d of the contact support 7a and transmits the movement of the connecting lever 7d to the cushioning material abutting member 2e is provided.

A plurality of hook portions 2 h that respectively engage with a plurality of connection holes 5 b formed in the cover 5 are formed on the bottom plate 2 g of the device case 2 a that contacts the cover 5.
The opening / closing operation transmitting portion 2f is slidably supported by a rod support portion 2i disposed in the device case 2a, and has a stroke rod that penetrates the second cushioning material 2c and is fixed at one end to the cushioning material abutting member 2e. 2j and a lever engaging member 2m that is fixed to the other end of the stroke rod 2j and that removably engages with the connecting lever 7d through the opening 2k formed in the contact plate 2g.

  The collision shock absorber 2 externally attached to the electromagnetic contactor 1 has a movable contact support 7a in a direction (left direction in FIG. 3) in which the movable contacts 7c1 and 7c2 are in contact with the normally open fixed contact TNO of the terminal portions 10a and 10b. Moves, the movement of the movable contact support 7a is transmitted to the opening / closing operation transmitting portion 2f via the connecting lever 7d and the opening / closing operation transmitting portion 2f, and the movable contacts 7c1 and 7c2 become the normally open fixed contacts TNO of the terminal portions 10a and 10b. Before the collision, the shock-absorbing material abutting member 2e comes into contact with the first shock-absorbing material 2b. That is, the stroke until the buffer material abutting member 2e contacts the first buffer material 2b is set shorter than the stroke until the movable contacts 7c1 and 7c2 contact the normally open fixed contact TNO of the terminal portions 10a and 10b. Yes.

Next, the operation of the electromagnetic contactor 1 will be described.
In the electromagnetic contactor 1 of the present embodiment, when the exciting coil 8a of the electromagnet 8 is in a non-excited state, an attractive force does not act between the armature 8d that drives the plunger 8c and the outer yoke 8f, and the contact portion 7 The movable contact support 7a is positioned on the right side of FIG. 3 by the urging force of the return spring 7b (hereinafter, the initial position of the contact portion 7). Then, the movable contacts 7c1 and 7c2 are in an open state, separated from the normally open fixed contact TNO of the terminal portions 10a and 10b, and the movable contacts 7c3 and 7c4 are in a closed state, and the terminal portions 10c and 10d. The normally closed fixed contact TNC is in contact with the normally closed fixed contact TNC while being pressed by the contact spring 14.

  When the exciting coil 8a of the electromagnet 8 is in an excited state, an attractive force acts between the armature 8d and the outer yoke 8f, the armature 8d is attracted to the outer yoke 8f, and the plunger 8c is driven to the left in FIG. To go. Therefore, the drive lever 9 fixed to the plunger 8c moves the movable contact support 7a to the left in FIG. 2 against the return spring 7b, and the movable contacts 7c1 and 7c2 are normally connected to the terminal portions 10a and 10b. The movable contacts 7c3 and 7c4 move away from the normally closed fixed contacts TNC of the terminal portions 10c and 10d while moving toward the open fixed contact TNO.

First, the movable contacts 7c1 and 7c2 come into contact with the normally open fixed contact TNO of the terminal portions 10a and 10b, and then the armature 8d is attracted and held by the outer yoke 8f, so that the contact portion 7 is in the operating position. Retained.
When the exciting coil 8a of the electromagnet 8 is brought into a non-excited state from the state where the contact portion 7 is held at the operating position, the armature 8d is attracted to the inner yoke 8e by the urging force of the return spring 7b and the permanent magnet, and the movable contact The support 7a moves to the right in FIG. 3, and the contact portion 7 returns to the initial position.

Next, the operation of the collision buffer 2 attached to the electromagnetic contactor 1 will be described with reference to FIGS.
When the exciting coil 8a of the electromagnet 8 is in an excited state and the movable contact support 7a moves toward the operating position, the movable member support 7a is moved to the buffer material abutting member 2e via the opening / closing operation transmitting portion 2f connected to the connecting lever 7d. The movement of the contact support 7a is transmitted, and the buffer material abutting member 2e moves toward the first buffer material 2b.

  At this time, as shown in FIG. 5, the contact spring 14 biasing the movable contacts 7c1 and 7c2 is applied with a stroke S at which the movable contacts 7c1 and 7c2 contact the normally open fixed contact TNO of the terminal portions 10a and 10b. Power increases rapidly. Here, as described above, the stroke ΔS1 until the shock-absorbing material contact member 2e comes into contact with the first shock-absorbing material 2b is until the movable contacts 7c1 and 7c2 come into contact with the normally-open fixed contact TNO of the terminal portions 10a and 10b. Therefore, before the movable contacts 7c1 and 7c2 come into contact with the normally open fixed contact TNO of the terminal portions 10a and 10b, the cushioning material contact member 2e elastically deforms the first cushioning material 2b. Abut while letting.

  The operation speed of the buffer material abutting member 2e is decreased by contacting the first buffer material 2b, and the decrease in the operation speed of the buffer material abutting member 2e is caused by the opening / closing operation transmitting portion 2f and the connecting lever 7d. Is transmitted to the movable contact support 7a. For this reason, as shown in FIG. 6, the operation speed of the movable contacts 7c1 and 7c2 when contacting the normally open fixed contact TNO of the terminal portions 10a and 10b is the movable speed of the electromagnetic contactor 1 that does not include the collision buffer device 2. The operating speed of the contacts 7c1 and 7c2 is lower. As a result, the movable contacts 7c1 and 7c2 whose operation speed is lowered come into contact with the normally open fixed contacts TNO of the terminal portions 10a and 10b.

Further, since the movement of the movable contact support 7a whose operating speed is reduced is transmitted to the plunger 8c via the drive lever 9, the armature 8d fixed to one end of the plunger 8c reduces the operating speed to reduce the outer yoke 8f. Is adsorbed and retained.
According to the electromagnetic contactor 1 having the above-described configuration, the operation speed when the movable contacts 7c1 and 7c2 of the contact portion 7 are in contact with the normally open fixed contact TNO of the terminal portions 10a and 10b is the collision buffer device interlocked with the movable contact support 7a. 2, the collision noise when the movable contacts 7c1 and 7c2 and the normally open fixed contacts TNO of the terminal portions 10a and 10b come into contact with each other is reduced. Further, the movement of the movable contact support 7a whose operating speed is reduced is transmitted to the plunger 8c via the drive lever 9, and the armature 8d fixed to one end of the plunger 8c is attracted to the outer yoke 8f at a low operating speed. Since the armature 8d and the outer yoke 8f come into contact with each other, the collision noise is reduced.

Therefore, the electromagnetic contactor 1 equipped with the collision buffer 2 reduces the collision noise when the movable contacts 7c1 and 7c2 and the normally open fixed contact TNO of the terminal portions 10a and 10b come into contact, and the armature 8d and the outer yoke 8f Since the collision noise at the time of contact also decreases, the noise during operation can be reduced.
Further, by engaging the lever engaging member 2m with the connecting lever 7d of the movable contact support 7a protruding outward from the cover 5, and externally attaching the collision buffer 2 to the electromagnetic contactor 1, the operation of the electromagnetic contactor 1 is achieved. Therefore, it is possible to reduce the noise by retrofitting the completed electromagnetic contactor 1.

  Further, when the shock absorber 2e of the collision shock absorber 2 abuts while elastically deforming the first shock absorber 2b, the movable contacts 7c1 and 7c2 and the normally open fixed contact TNO of the terminal portions 10a and 10b come into contact with each other. , The collision when the armature 8d and the outer yoke 8f come into contact with each other is relaxed, and there is no component to which the collision force at the time of operation is directly applied in the electromagnetic contactor 1, so that the durability of the electromagnetic contactor 1 is improved. Can be improved.

Further, in the collision shock absorber 2, the first shock absorber 2 b and the shock absorber contact member 2 e are arranged in the device case 2 a, and the opening / closing operation transmission portion 2 f connected to the connecting lever 7 d buffers the movement of the movable contact support 7 a. Since it has a simple structure of transmitting to the material abutting member 2e and abutting while elastically deforming the first buffer material 2b, the manufacturing cost of the collision buffer device 2 can be reduced.
In addition, although the electromagnet 8 which comprises the electromagnetic contactor 1 of the said embodiment is a DC operation type electromagnet, even if it employ | adopts an AC operation type electromagnet, there can exist the same effect.

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic contactor, 2 ... Collision shock absorber, 2a ... Device case, 2b ... 1st buffer material (buffer material), 2c ... 2nd buffer material, 2d ... Stroke space, 2e ... Buffer material contact member, 2f ... Opening / closing operation transmitting portion, 2g ... bottom plate, 2h ... hook portion, 2i ... rod support portion, 2j ... stroke rod, 2k ... opening, 2m ... lever engaging member, 3 ... lower case, 4 ... upper case, 5 ... cover (A part of the housing) 5a ... display window, 5b ... connection hole, 7 ... contact part, 7a ... movable contact support, 7b ... return spring, 7c1-7c4 ... movable contact, 7d ... connection lever, 8 ... electromagnet, 8a ... excitation coil, 8b ... spool, 8c ... plunger (movable core), 8d ... armature, 8e ... inner yoke, 8f ... outer yoke (fixed core), 9 ... drive lever, 10a-10d ... terminal, 11 ... coil Terminal, 12 ... contact piece, 13 Partition wall, 14 ... contact spring, TNC ... normally closed stationary contact, TNO ... normally opened stationary contact

Claims (2)

A contact portion and an electromagnet are housed in a case in parallel. The contact portion includes a movable contact support, a plurality of movable contacts arranged on the movable contact support, and a fixed contact arranged so as to be able to contact with and separate from the movable contacts. The electromagnet includes an exciting coil, a fixed core, and a movable core that is integrated with the movable contact support and is disposed so as to be in contact with and away from the fixed core. In the electromagnetic contactor that opens and closes each corresponding movable contact and fixed contact by the core being sucked by the fixed core and the movable contact support moving together with the movable core,
At the time of opening and closing operation, a collision buffer device that reduces a collision sound when the movable contact comes into contact with the fixed contact and a collision sound when the movable core is attracted to the fixed core is externally attached to the housing .
A connecting lever integrated with the movable contact support protrudes from a part of the housing to the outside,
The impact buffering device is connected to the buffer material, the buffer material contact member that strokes toward the buffer material, and the connecting lever, and the opening / closing operation that transmits the movement of the movable contact support to the buffer material contact member. An electromagnetic contactor comprising: a transmission portion, wherein a stroke until the shock-absorbing material contact member comes into contact with the shock-absorbing material is set shorter than a stroke until the movable contact comes into contact with the fixed contact . The cushioning material is an elastically deformable member, and a decrease in the operation speed of the cushioning material abutting member in contact with the cushioning material is transmitted to the movable contact support via the opening / closing motion transmitting portion and the connecting lever. electromagnetic contactor according to claim 1, characterized in that it is.

Images