JPS6237320Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an electromagnetic relay.

The restoration spring of the electromagnetic relay is used to quickly restore the contacts after the excitation of the electromagnet is released, and to maintain this restored state. Most recovery springs for conventional electromagnetic relays are composed of a single leaf spring, and the stiffness of the spring characteristics is constant. Therefore, the load force exerted by the recovery spring on the moving member that contacts the recovery spring and moves by the excitation of the electromagnet to open and close the contact, etc., is due to external vibrations, as shown by A in Fig. 1. A linear change between the load force f ₁ required to overcome an impact and maintain the moving member in its restored state, and the load force f ₂ required to quickly restore the moving member after the electromagnet is de-energized. do. On the other hand, the magnetic attraction force required to operate an electromagnetic relay that moves a moving member by excitation of an electromagnet must be greater than the total load, which is the sum of the load on the recovery spring, the load on the contact springs, the friction load on the mechanism, etc. . However, this magnetic attraction force characteristic is a quadratic curve bulging downward as shown in B in FIG. 1, and must always be above straight line A. Therefore, straight line A
Since the point B _{' that} is closest to It was hot.

The object of the present invention is to provide an electromagnetic relay that overcomes these drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a sectional view showing the entire electromagnetic relay of the present invention, FIG. 3 is a perspective view with the case and cover removed, and FIG. 5 is a diagram showing the displacement of the recovery spring.

In these figures, 1 is a case, 2 is a cover, and 3 is an electromagnet.

Above the electromagnet 3 (in FIGS. 2 and 3), a rectangular flat contact board 5 on which a plurality of contacts 4 are arranged in a plane is fixed to the case 1. A holding member 8 as a moving member that holds a coil-shaped conductive member 6 in a recess 7 on the lower surface and moves by electromagnetic drive is disposed as a moving member in a direction parallel to the contact substrate 5.

This holding member 8 is sandwiched between the upper end of an armature 9 provided on the iron core 3a side of the electromagnet 3 and the upper end of a recovery spring 10 provided on the opposite side of the electromagnet 3 from the armature 9. It's summery. When the coil 3b of the electromagnet 3 is energized and excited, the upper end side of the armature 9 is attracted to the iron core 3a against the biasing force of the recovery spring 10.
When the holding member 8 moves in the 0 direction and the coil 3b is de-energized and excitation is released, the holding member 8 returns toward the armature 9 due to the biasing force of the recovery spring 10. Along with this movement of the holding member 8, the holding member 8
The conductive member 6 sandwiched between the recess 7 and the contact board 5 moves while being in contact with the upper surface of the contact board 5. For example, as shown in FIG.
a, 4b, and 4c are arranged and the holding member 8 is located on the right side (in FIG. 2), the contacts 4a and 4b are electrically connected by the conductive member 8, and the holding member 8 is located on the left side. (in FIG. 2), the conductive member 8 electrically connects the contacts 4a and 4c. Therefore, the holding member 8
By moving , the connection state between the contacts is switched.

The armature 9 has a hinge spring 1 bent at a fulcrum 12a at a substantially right angle to one end of a metal strip 11.
2, and the restoration spring 10 is constituted by a single leaf spring bent at a fulcrum 10a at a substantially right angle to the other end of the strip 11.

The recovery spring 10 is a fulcrum 10 bent at an almost right angle.
The free end 10b is located midway between a and the free end 10b.
It has a bent portion 10c whose side is slightly bent toward the armature 9. Slightly below this bent portion 10c, the restoration spring 10 is moved counterclockwise around the fulcrum 10a so that it comes into contact with the holding member 8 when the restoration spring 10 is pushed leftward and deformed. A stopper 13 is provided on the inner wall 1a of the case 1 so as to protrude rightward to the middle of the width of elastic deformation (in FIG. 2). Therefore, as shown in FIG. 5, the holding member 8 is pushed by the armature 9 and moves to the left, and the recovery spring 10 is
When deforming from →Y →Z, the stopper 13 comes into contact with the recovery spring 10 at the intermediate Y stage.

As the stopper 13 comes into contact with the holding member 8 midway through its displacement, the span of the recovery spring 10 becomes shorter by a than _l1 , as shown in FIG.
Changes to l ₂ . For this reason, the stiffness of the recovery spring 10 is of two types, and the load force that this recovery spring 10 applies to the holding member 8 has a magnetic attraction whose gradient changes in two stages, C1 and C2, as shown in C in FIG. The magnetic attraction force is C due to the quadratic curve that bulges downward.
Since it is sufficient that the load force is not less than the load force shown in FIG. 1, the magnetic attraction force shown in FIG.

As explained above, according to the present invention, (a) the magnetic attraction force required to move the holding member 8 can be significantly reduced compared to the conventional one, and therefore power consumption can be reduced.

(b) It is possible to set ideal load characteristics that match the magnetic attraction force characteristics.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the characteristics of the load force and magnetic attraction force of the restoration spring with respect to the displacement of the moving member holding member, Fig. 2 is a sectional view showing an electromagnetic relay according to an embodiment of the present invention, and Fig. 3 is a diagram showing the case and FIG. 4 is a perspective view showing the relationship between the conductive member and the contact of the electromagnetic relay shown in FIGS. 2 and 3. FIG. 5 is a perspective view showing the displacement of the moving member (holding member) and the recovery spring. FIG. 3...Electromagnet, 4...Contact, 5...Contact board,
6... Conductive member, 7... Recessed portion, 8... Holding member,
9... Armature, 10... Recovery spring, 10a... Fulcrum, 10b... Free end, 10c... Bent part, 13
...stopper.

Claims (1)

[Scope of Claim for Utility Model Registration] An electromagnet, an armature that moves by being attracted to the iron core when the electromagnet is energized, and a contact holding member that moves in conjunction with the attraction and movement of the armature;
The vicinity of the free end contacts the contact holding member to apply a biasing force in the direction of movement toward the armature, and the contact is held against the biasing force by suction movement of the armature due to energization of the electromagnet. an electromagnet comprising a recovery spring that allows the member to move and elastically deforms in a direction away from the armature around a fulcrum, and pushes the contact holding member back toward the armature when the electromagnet is deenergized to restore the contact holding member; In the relay, a stopper that comes into contact with an intermediate portion between a free end of the restoration spring and a fulcrum is provided at an intermediate position of a deformation width when the restoration spring is elastically deformed in a direction away from the armature due to energization of the electromagnet. An electromagnetic relay characterized by: