JPS63266725A - Relay - Google Patents

Abstract

PURPOSE:To make an open-circuit voltage large by shifting a rocking supporting point of an armature toward the other end of a yoke before the armature touches the other end of the yoke. CONSTITUTION:When a coil 14 is energized, an armature 13 rocks with the end of a yoke 12a being a rocking supporting point so that a magnetic pole part 13a of the armature approaches a head part of an iron core 11a. The armature 13 begins to move and contacts with a bump 12c before it touches the head part 11a of the iron core. When the rocking supporting point of the armature 13 is transferred to the bump 12c from the end of the yoke 12a, the end of the yoke 12a and the one end of the armature 13b begins to be detached from each other. Thereupon, magnetoresistance between the yoke piece 12 and the armature 13 increases and a distance between the rocking supporting point and an attraction plane decreases. Before attractive force is thus lowered, an open-circuit voltage can be made large without insufficient contact pressure.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a relay.

[Background technology]

Figure 5 shows a conventional relay. As shown in the figure, this relay includes an electromagnet device 1 and a contact mechanism 2. 1. The armature 13 of the electromagnet device 1 is connected to the movable contact spring 26 of the contact mechanism 2.
The yoke 11' is supported by the iron core 11 and the L-shaped yoke piece 12, and is magnetically connected to one end 12a of the yoke 11' so as to be swingable. When the coil 14 is energized from the state shown in FIG. 5, an attractive force acts between the magnetic pole part 13a of the armature 13 and the other end of the yoke (core head) 11a, and the armature 13 swings the one end 12a of the yoke. It swings as a dynamic fulcrum, and the armature magnetic pole part 1
3a is attracted to the core head 11a, and the space between the movable contact 28 and the fixed contact 29 is closed. When the current to the coil is cut off from this state, the armature 13 is moved by the return force of the movable contact spring 26. The movable contact 28 and the fixed contact 29 are opened by being separated from the core head 11a. In this way, in this relay, the armature 13 swings toward and away from the core head 11a, and the contact mechanism 2 is opened and closed by this swing.

The relationship between the attractive force and the spring load in this relay is shown in Figure 7. In Figure 7, the horizontal axis X represents the stroke (armature magnetic pole part 1
3a and the core head 11a), the vertical axis F is the force, FN is the rated suction force curve, F is the emotional suction force curve, Fo is the open suction force curve, and F is the spring load curve. . In this figure, when the suction force exceeds F, the movable contact 28 and fixed contact 29 are moved and closed, and when it becomes less than FD, it is released and the contacts 28 and 29 are opened.

In this relay, the higher the efficiency, the greater the attraction force at the O point position (armature attraction position).
A relay as shown in FIG. 6 was developed to overcome the above-mentioned drawbacks of lower open circuit voltage and poor sensitivity when open. As shown in the figure, in this relay, a regular plate 3 is attached to the core head 11a, and when the armature 13 is attracted to the core head 11a, the armature 13 comes into contact with the regular plate 3. , armature magnetic pole part 13a and iron core head 11
A gap corresponding to the thickness xR of the regular plate 3 is formed between the regular plate 3 and the regular plate 3. By doing this, as shown in Fig. 7, the adsorption position of the armature moves to the 0' point,
The open attraction force curve changes from F, to F,', making it possible to have a higher open voltage than the relay shown in FIG.

However, on the other hand, the OT amount (the amount of movement of the armature after the movable contact and the fixed contact make contact) decreases from OTA to OT8, resulting in insufficient contact pressure (FA - F
There was a problem called l). Moreover, there are material costs and processing costs for the regular plate.

There have been problems such as increased costs due to assembly costs, etc., and generation of residual plate powder due to wear.

[Purpose of the invention]

In view of the above circumstances, it is an object of the present invention to provide a relay that does not cause insufficient contact pressure, has a high open circuit voltage, and is free from the risk of cost increase and generation of accidental plate powder. It is an object.

[Disclosure of the invention]

To achieve the above object, the present invention provides an electromagnetic device in which an armature magnetically connected to one end of a yoke around which a coil is wound swings toward and away from the other end of the yoke; In a relay equipped with a contact mechanism that is opened and closed by swinging of an armature, the swing fulcrum of the armature is shifted toward the other end of the yoke by the time the armature contacts the other end of the yoke. The gist of the relay is that it is characterized by:

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the relay according to the present invention. As shown in the figure, this relay includes an electromagnet device 1 and a contact mechanism 2.

The electromagnet device l includes a yoke 11', an armature 13, and a coil 1.
4. It is composed of a coil frame 15. The yoke 11' is
An iron core 11 is coupled to an L-shaped yoke piece 12. The coil 14 is wound around the iron core 11 via a coil frame 15. The armature 13 is supported by the movable contact spring 26 of the contact mechanism 2, and is disposed so as to straddle one end 12a of the yoke and the core head 11a, and one end 13b thereof swings against the one end 12a of the yoke 11'. possible magnetically connected. An extension portion 12b extending toward the other end of the yoke (core head) lla is formed at one end 12a of the yoke 11'. A protrusion 12C that protrudes toward the armature 13 from a line connecting one end of the yoke 12a and the core head 11a is formed at the tip of the extension 12b. Contact mechanism 2
2 has a movable contact 28 supported by a movable contact spring 26 and a fixed contact 29 supported by a fixed terminal plate 27 (al indicates a state where the coil 14 of this relay is not energized) It is raining. In this state, the armature 13
is supported by a movable contact spring 2-6, and one end of the yoke 12a
It is designed to oscillate using the fulcrum as a fulcrum. When the coil 14 is energized from this state, an attractive force acts between the core head 11a and the armature magnetic pole portion 13a facing it, and the armature 13 uses the yoke end 12a as a swinging fulcrum.
The armature magnetic pole portion 13a is swung toward the core head 11a. Along with this rocking, the movable contact spring 26 is moved, and the movable contact 28 approaches the fixed contact 29. Armature 1
3, from when it starts moving until it touches the core head 11a,
It comes into contact with the protrusion 12c. After abutting, the armature 13 touches the protrusion 1
2C and swings using the protrusion 12C as a swinging fulcrum. When the swinging fulcrum of the armature 13 moves from the yoke one end 12a to the protrusion 12c, the yoke one end 12a and the armature one end 13b
As a result, the magnetic resistance between the yoke piece 12 and the armature 13 increases, and the distance between the swing fulcrum and the attraction surface decreases. Thereafter, as shown in FIG.
9 is closed. When the current to the coil 14 is cut off from the state shown in FIG. 2(b), the armature magnetic pole portion 13a is separated from the core head 11a, resulting in the state shown in FIG. 2(al).

The relationship between the attraction force and the spring load during the above operation is shown in FIG. 3 in comparison with the conventional relay shown in FIG. In Fig. 3, the horizontal axis X is the stroke (distance between the armature magnetic pole part 13a and the iron core head 11a), the vertical axis F is the force, FN' is the rated attraction force curve of the relay shown in Fig. 1, and FM is the 5th axis The rated attraction force curve of the relay in the figure, F,' is the impressive attraction force curve of the relay in Figure 1,
F, is the emotional attraction force curve of the relay shown in Figure 5, FD'' is the opening attraction force curve of the relay, shown in Figure 1, F is the opening attraction force curve of the relay, shown in Figure 5, and F is the spring load curve. As shown in the figure, the relay according to the present invention shown in FIG. 1 is similar to the conventional relay shown in FIG. 5 until the armature 13 starts moving from the state shown in FIG. It has an attractive force similar to that of the relay.After the armature 13 comes into contact with the protrusion 12c and the pivot point of the armature 13 moves from the yoke end 12a to the protrusion 12C, the yoke piece 12 and the armature 13
Since the magnetic resistance between the oscillation fulcrum and the attracting surface increases, and the distance between the swing fulcrum and the attracting surface becomes smaller, the attracting force decreases compared to the relay shown in FIG. As a result, the open attraction force curve shifts from the conventional point F to FD#, and the open point shifts from the conventional point A to 0 point, allowing a high open circuit voltage. In addition, as a result of the decrease in suction force, the armature 13
In other words, the suction force when adsorbing the armature 13 becomes smaller.
Since the force when contacting the core head 11a becomes smaller,
It is possible to reduce the collision noise between the armature 13 and the iron core head 11a, and also to suppress the wear caused by the collision.Furthermore, like the relay shown in FIG.
Since a regular plate is not used, there are no problems such as increased costs due to material costs, processing costs, assembly costs, etc. of the regular plate, or generation of powder from the regular plate due to wear. Further, in this embodiment, a protrusion 12c serving as a swinging fulcrum protrudes toward the armature 13 from a line connecting one end of the yoke 12a and the core head 11a. Therefore, compared to the relay shown in Fig. 5, the stroke
As a result, 0Tii increases from the conventional OTA to OTc, and the contact pressure also increases from the conventional FA to F.

Instead of the protrusion 12C of the embodiment described above, as shown in FIG.
2a and lla may be made to protrude from the tying cotton.The other structure of the relay shown in FIG. 4 is the same as that of the relay shown in FIG.

The swing fulcrum is not limited to the above, and may be formed of other materials such as a base or a cover. Above,
Although the swing fulcrum is shown to change intermittently, it may be changed continuously.

In short, it is sufficient that the swing fulcrum of the armature is shifted toward the other end of the yoke by the time the armature comes into contact with the other end of the yoke (the core head in the above embodiment). That is, by doing this, for example, if we explain with reference to FIGS. 2(a) and 2(b), the clockwise moment and the counterclockwise moment about the swing fulcrum will be as shown in FIG. (The state shown in FIG. 2(b) is different from the state shown in FIG. 2(b). In other words, in the state shown in FIG.
Although only a clockwise moment is generated due to the attractive force between the armature 1a and the armature 1a, in the state shown in FIG.
This reduces the suction force between the yoke and the other end 11a of the yoke. Note that, as shown in each of the above embodiments, if the distance between the one end of the yoke 12a and the armature 13 is further widened before the end of the yoke contacts the other end 11a of the yoke, the suction force can be further reduced. It is.

The relay according to the present invention is not limited to the above embodiment. The yoke does not have to be formed by joining a yoke piece to an iron core, but may be an integral piece. The armature and one end of the yoke may be in a state where there is always a gap between them. The relay according to the present invention may be applied to a timer or the like.

〔Effect of the invention〕

As seen above, the relay according to the present invention is an electromagnetic device in which an armature magnetically connected to one end of a yoke around which a coil is wound swings toward and away from the other end of the yoke. and a contact mechanism that is opened and closed by the swinging of the armature, such that the swing fulcrum of the armature shifts toward the other end of the yoke by the time the armature contacts the other end of the yoke. It is characterized by the fact that Therefore, the contact pressure will not become insufficient.
A high open circuit voltage can be obtained, collision noise and wear can be suppressed, and there is no risk of increased costs or generation of regular plate powder.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view of an embodiment of the relay according to the present invention, FIGS. 2(a) and 2(b) are explanatory diagrams of the operation of the embodiment, and FIG. FIG. 4 is a graph showing the relationship between the attraction force and spring load of the embodiment, FIG. 4 is a cross-sectional view of another embodiment, FIGS. 5 and 6 are cross-sectional views of a conventional relay, and FIG. The figure is a graph showing the relationship between the attractive force and spring load of the relays shown in FIGS. 5 and 6. 1... Electromagnet device 2... Contact mechanism 11'...
Yaw lla...Other end of yoke 12a...One end of yoke 12C...Protrusion 13...Archive 14...
・Coil 15b...Part of the agent for the coil frame Patent attorney Takehiko Matsumoto Figure 1 (b) F Figure 3 Figure 5 Figure 7

Claims (1)

[Claims] (1) An electromagnet device in which an armature magnetically connected to one end of a yoke around which a coil is wound swings toward and away from the other end of the yoke, and an electromagnetic device that is opened and closed by swinging of the armature. What is claimed is: 1. A relay comprising a contact mechanism, wherein a swing fulcrum of the armature is shifted toward the other end of the yoke by the time the armature comes into contact with the other end of the yoke.