JPS6122526A - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electromagnetic relay having a contact device that requires a wiping operation between contacts.

[Background Art] This type of electromagnetic relay is designed to prevent the contacts from welding due to inrush current when the contacts are turned on, or to wear out the contacts due to an increase in the number of openings and closings, resulting in malfunctions such as poor contact and temperature rise. A wiping operation is performed between the contacts. To obtain this wiping action, as seen in hinged electromagnetic relays, a slope spring movable contactor having a movable contact is attached to the amatia of the electromagnetic device, and the amount of amatia movement from the point when both contacts come into contact, that is, the amount of Generally, the movable contact is deflected by the travel, and this deflection causes the movable contact to slide on the fixed contact. However, with a method that relies only on the deflection of the movable contact, there is a limit to the amount of sliding between the contacts, that is, the amount of wiping, the wiping force, and the ability to ensure sufficient wiping speed. Alternatively, it is desired to improve wear resistance.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to improve the wiping operation between contacts, thereby improving the welding resistance or wear resistance of the contacts. We are here to provide you with electromagnetic relays.

[Disclosure of the Invention] The electromagnetic relay according to the present invention has a yoke separated into a fixed piece and a movable piece, and a guide portion of the fixed piece formed so that the fixed core can move in a direction orthogonal to the swinging direction of the amatia. , an auxiliary member which movably supports a block including a coil by attaching a fixed iron core fixed to the movable piece, and further forms an attracted part that receives a magnetic attraction force from the fixed piece in a direction perpendicular to the swinging direction. The yoke is magnetically coupled to the fixed iron core, and the block is biased by a spring in the opposite direction to the magnetic attractive force, so that even if the contact melts due to an inrush current when the contact is turned on or an arc due to bounce, The wiping action is sufficient to cut the melt bridge 7 before it solidifies, thereby improving the welding resistance or wear resistance of the contact.

(Example) An example of the present invention will be described below based on FIGS. 1 to 3.

Reference numeral 1 designates an electromagnetic relay, which has a housing made up of a device stand 2 and a cover 3. A fixed contact terminal 4, a movable contact terminal 5, and a coil terminal 6 are installed from the device stand 2. A fixed contact 8 having a series of fixed contacts 7 and an electromagnet device 9 are equipped.

The electromagnet device 9 includes a coil 10, a rod-shaped fixed core 11 around which the coil 10 is wound, a yoke 2 which is substantially U-shaped and has the fixed core 11 fixed to its bottom, and a base end 13a that swings. It is freely supported by one end of the yoke 12, and the tip 13b faces the end surface 11, a of the fixed iron core 11, and this end surface 1
The armature 13 is biased by a tension spring 14 whose one end is suspended from the yoke 12 in the direction away from the yoke 1a.

15 is a movable contact made of an elastic material, a movable contact 16 is provided at the tip 15a, and the base end 15b is attached to the amatia 13 via an insulator 17, and this movable contact 16 is connected to and separated from the fixed contact 7. do.

Next, the main parts of the present invention will be explained in detail. The substantially U-shaped yoke 12 described above is separated into an L-shaped lower yoke piece (fixed piece) 18 and upper yoke piece (movable piece) 19, which are located on one side 18a of each other.

19a are arranged in a polymerized manner. Since the other surface 18b of the lower yoke piece 18 is fixed to the table 2, the lower yoke piece 18 will be referred to as yoke 1 below.
This is called the second fixed piece. A U-shaped guide portion 18C is formed on one surface 18a of the fixed piece 18, and the end surface thereof is the opening side. A U-shaped coupling hole 19b is also formed on one surface 19H of the upper yoke piece 19, and the opening side is the end surface of the coupling hole 19B.
The outer circumferential side 11b of the fixed iron core 11 is inserted into and fixed to 9b. This coupling hole 19b may be a general round hole. The other surface 19b of the upper yoke piece 19 has a recessed stepped portion 19C having an opening on the end surface side, and a spring locking portion 19d is formed by cutting and raising the center portion. The fixed core 11 is
A circumferential groove 11G having a diameter slightly smaller than the inner diameter of the guide portion 18C is formed near the end surface opposite to the end surface 11a, and this circumferential groove 11C is movably attached to the guide portion 18c. Therefore, the upper yoke piece 19 to which the fixed iron core 11 is fixed is movable with respect to the fixed piece 18, and will be hereinafter referred to as a movable piece.

Reference numeral 20 denotes an auxiliary yoke formed in an L-shape from a magnetic plate material, and a hole 20b provided in the base 20a is connected to the end surface 1 of the fixed iron core 11.
An attracted portion 20C is provided which is inserted into the outer circumferential shell 11b on the 1a side and magnetically coupled thereto, and which faces the other surface 18b of the fixed piece 18 with a predetermined gap g therebetween.

The amachia 13 is swingably supported by a step portion 19C of the movable piece 19 at swing fulcrum portions 13C formed on both sides of its base end 13a. 13d is a spring locking portion formed protruding from the base end 13a, and the tension spring 14 is tensioned and suspended between this and the spring locking portion 19d of the movable piece 19. Reference numeral 21 denotes a return spring tensioned and suspended between the spring locking portion 19d of the movable piece 19 and the cover upper wall 3a.

Therefore, the guide portion 18c of the fixed piece 18
is formed so that its axis can move in a direction orthogonal to the swinging direction of the amachia 13, and by attaching the circumferential groove 11C of the fixed iron core 11 to this guide portion 18c, a block including the coil 1o, i.e. The coil 10, the fixed core 11, the amatia 13, the tension spring 14, the movable piece 19, and the auxiliary yoke 20 are movably supported, and as a result, the attracted part 20 of the auxiliary yoke 2o is magnetically coupled to the fixed core 11.
c receives a magnetic attraction force from the other surface 18b of the fixed piece 18 in a direction orthogonal to the swinging direction. The block including this coil 10 is then biased by the return spring 21 in a direction opposite to the magnetic attraction force that the auxiliary yoke 20 receives from the fixed piece 18. As a result, the block including the coil 1o supports the amatia 13 in a swingable manner and is movable in a direction orthogonal to the swinging direction.
When the coil 10 is energized, the amachia 13 is attracted to the fixed iron core 11 against the spring force of the tension spring 14 (the first half of the swing), and the attracted part 20c is moved from the other surface 18b of the fixed piece 18 to this It moves in the direction perpendicular to the oscillation direction by receiving a magnetic attraction force that exceeds the spring force of the return spring 21 in the direction perpendicular to the oscillation direction (operation). Figs. 1 and 3 (a) show both contacts 7 , 16 are in the open state.

When the coil 1o of the electromagnet device 9 is excited in this state,
Since the amachia 13 is attracted to the fixed core end face 11a against the spring force of the tension spring 14 (the first half of the swing in the direction of arrow A), the movable contact 16 comes into contact with the fixed contact 7, and as shown in FIG. )
is in the input state.

At the same time, the attracted portion 20c of the auxiliary yoke 20
The return spring 2 is inserted from the other surface 18b in a direction perpendicular to this swinging direction.
It moves at high speed in a direction perpendicular to this swinging direction (in the direction of arrow B) by receiving a magnetic attraction force that exceeds the spring force of 1. Therefore, the movable contact 1G reaches the position shown in FIG.
The wiping operation is performed by sliding on the fixed contact 7 by an amount approximately equal to the predetermined gap g between the fixed piece 18b and the other surface 18b of the fixed piece 18.

When the excitation of the coil 10 disappears in the state shown in FIG. 3(C),
Since the suction force of both the fixed iron core 11 and the other surface 18b of the fixed piece 18 disappears, the amachia 13 returns to the direction opposite to the arrow A direction by the spring force of the tension spring 14 (the second half of the swing), and the return spring 21 As a result, the state returns to the direction opposite to the direction of arrow B and returns to the state shown in FIG. 3(a).

As is clear from this operation, the conventional wiping operation relies on the sliding of the movable contact depending only on the deflection of the movable contact, but in the present invention, the movable contact 16 is moved in a direction orthogonal to the swinging direction of the amatia 13. Since it is moved at high speed, the wiping amount, wiping force, and even wiping speed can be significantly improved.

In addition, the electromagnetic relay of the present invention can be configured by appropriately selecting the design values of each member that causes magnetic attraction, that is, the electromagnet device 9, especially the fixing piece 18, the auxiliary yoke 20, the return spring 21, and the predetermined gap g. It is also possible to obtain an optimal wiping operation according to the In other words, if the applied current is small and contact welding is unlikely to occur, the attracted part 20c
The magnetic attraction force between the fixed piece 18 and the other surface 18b of the fixing piece 18 is also small, and the wiping amount and wiping force are also small.On the other hand, when the current is large and contact welding is likely to occur, this magnetic attraction force is also large and the wiping amount and wiping force are also large. It is.

[Effects of the Invention] As described above, the electromagnetic relay of the present invention has a yoke separated into a fixed piece and a movable piece, and a guide for the fixed piece formed so that the fixed iron core can move in a direction perpendicular to the swinging direction of the amatia. A fixed iron core fixed to the movable piece is attached to the part to movably support a block including the coil, and further an attracted part is formed which receives a magnetic attraction force from the fixed piece in a direction perpendicular to the swinging direction. The auxiliary yoke is magnetically coupled to the fixed iron core, and the block is biased by a spring in the direction opposite to the magnetic attractive force, so when the coil is excited, the block containing the coil oscillates in the amatia. It moves to close the contact and moves at high speed in a direction perpendicular to this swinging direction, so even if the contact melts due to the inrush current or arc caused by bounce when the contact is closed, the melted bridge will be cut before it solidifies. The wiping operation can be performed with sufficient wiping amount, wiping force, and wiping speed between the contacts, thereby improving the welding resistance or wear resistance of the contacts.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the electromagnetic relay according to the present invention, Fig. 2 is an exploded perspective view of the main part thereof, Fig. 3 is a side view of the main part showing its operation state, and (a) shows the contact opening. (b) is the state immediately after the contact enters, and (C) is the contact state. 1-electromagnetic relay, 2-device stand, 3-cover, 7-fixed contact, 8-fixed contact, 9-electromagnetic device, 10-coil, 1
1-Fixed iron core, 12-・Coke, 13-Amathia, 14
- tension spring, 15 - movable contact, 16 - movable contact, 18
-Fixed piece of yoke (lower piece of yoke), 19-Movable piece of yoke (upper piece of yoke), '20-Auxiliary yoke, 21
-Return spring. Patent Applicant Matsushita Electric Works Co., Ltd. Patent Attorney Toshimaru Takemitsu (and 2 others) Figure 1 Figure 2

Claims (1)

[Claims] (1) A coil, a fixed core, a yoke, and a base end are swingably supported by one end of the yoke, and the tip faces the end face of the fixed core, and is spring-biased in a direction away from the end face of the fixed core. An electromagnetic relay comprising an electromagnetic device configured with a movable contact provided with a movable contact is attached to the amatia, and the movable contact contacts and separates from a fixed contact,
The yoke is separated into a fixed piece and a movable piece, and a fixed iron core fixed to the movable piece is attached to a guide portion of the fixed piece, which is formed so that the fixed iron core can move in a direction perpendicular to the swinging direction. An auxiliary yoke that movably supports a block including a coil and further forms an attracted part that receives a magnetic attraction force from the fixed piece in a direction perpendicular to the swinging direction is magnetically coupled to the fixed iron core, and the block An electromagnetic relay in which is biased by a spring in a direction opposite to the magnetic attraction force.