JPS5838517Y2 - Enclosed electromagnetic relay - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an encapsulated electromagnetic relay that is small in size, has low manufacturing costs, and has high operational reliability.

Conventional electromagnetic relays include a non-enclosed type electromagnetic relay as shown in FIG. 1, and an enclosed type reed switch as shown in FIG.

In Fig. 1, 1 is a movable contact spring, 2 is a fixed contact, and 3 is a movable contact spring.
is a card, 4 is a balance spring, 5 is an armature, 6 is an iron core, 7 is an excitation coil, and 8 is a case.

That is, an electromagnetic force is applied by the current flowing through the excitation coil 7, the armature 5 is attracted, the card 3 is moved, and the contacts on the contact spring 1 come into contact with the stationary contacts 2, and are in a closed state.

When the coil current is cut off, the force of the balance spring 4 causes the contact spring 1 to separate from the fixed contact 2 via the card 3, resulting in an open state.

In such non-enclosed type relays, the case 8 does not have a perfect function of cutting off the contact atmosphere from the outside air, and the contact resistance tends to increase as a result of contact contamination by dust or active gas. In order to suppress this, the contact force for each contact point must be at least 4gr, typically 6gr.

This makes it difficult to downsize the movable contact spring and electromagnet.

Figure 2 shows a reed switch, 9 and 9' are reed pieces, and 10
is an enclosed glass tube.

In the reed switch, a current is passed through an excitation coil wound around the outside of the glass tube 10, and the reed pieces 9, 9' made of a magnetic material having spring properties come into contact with each other.

Since the contact part can be enclosed and the outside air can be shut off, the contact force can be reduced to about 2gr, allowing for miniaturization.

However, since the damping effect on the movement of the lead pieces 9, 9' is small when the contacts are opened, fluctuations in the contact gaps continue for a relatively long time, which may impair operational reliability.

Furthermore, the reed switch requires sealing of the glass tube 10 for each contact, which is economically disadvantageous.

In order to solve these drawbacks, the present invention has a sealed structure that encapsulates a plurality of contacts at the same time, and is equipped with a backstop to quickly stop the movement of the movable contacts.The present invention will be described below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which 11 is a common base;
12 is a movable contact spring, 14 is a fixed contact, 15 is a base 11
A fixed contact terminal 16 is made of a magnetic material and is insulated and fixed vertically through the substrate 11 and has a fixed contact 14 at the shaft end.
17 is a rigid backstop 18.1 made of a magnetic material extending substantially parallel to the base 11;
9 is an electrical insulator such as glass for electrically insulating and sealing the fixed contact 15 and the base 11 or the backstop fixed terminal 16 and the base 11, 20 is a drive coil, and 21 is a cover.

FIG. 4 is a detailed view of a portion related to one contact.

The movable contact spring 12 is made of a magnetic material, and as is clear from FIG. The circumference is uniformly fixed to the backstop surface by welding or the like so that it contacts the backstop surface.

The central plane part that becomes the movable contact 13 moves uniformly toward the fixed contact 15 and comes into contact with the fixed contact 15, so that it has both the function of an armature and the function of a movable contact spring. .

Next, the operation of this relay will be explained and explained according to Fig. 4.

When current flows through the drive coil 20, the fixed contact terminal 15 is excited, the movable contact 13 is attracted, and the fixed contact 14
“to come into contact with”.

When the fixed contact terminal 15 is de-energized, the movable contact spring 1
It is separated from the fixed contact by the spring force of 2.

At this time, the movable contact spring 12 collides with the backstop 17 and thereby loses kinetic energy, reducing the chance of re-closing and shortening the time it takes to come to rest.

The relay of the present invention is sealed with a base plate 11 and a cover 21 to cut off the outside atmosphere, and has a fixed contact terminal 15.
and foundation 11. Backstop fixing terminal 16 and base 11
It is sealed and insulated.

In addition, the movable contact spring 12 is fixed uniformly around the circumference to the backstop surface, so that the movable contact surface contacts the fixed contact while remaining almost parallel to the backstop surface, so the spring is firmly fixed and the contact contact performance is improved. is stabilized, and the contact force can be reduced to approximately 2 gr, similar to that of a reed switch.

As explained above, according to the present invention, the contacts are hermetically sealed with a material that insulates and seals the common base, the cover, and the contact terminals, and the contact atmosphere is cut off from the outside air, thereby preventing contact contamination and deterioration. The movable contact spring is made of magnetic material and also serves as an armature, and the contact/disengagement of the opposing movable contact and fixed contact is controlled by the pair of these contacts. A movable contact spring is directly controlled by magnetic flux generated by energizing a coil wound around a fixed contact terminal arranged on a fixed shaft, and a closed magnetic path for opening and closing the contact is fixed to a movable contact spring.

Since it also serves as a magnetic backstop and a fixing terminal for the magnetic material that supports this backstop, it has the advantage of being able to reduce the number of parts.

Furthermore, since a plurality of contacts can be manufactured by sealing them at once, manufacturing costs can be reduced.

Furthermore, the structure allows the contact spring to move vertically and collide with the rigid backstop on the fixed surface side, quickly losing kinetic energy, so the movement of the movable contact ends quickly, reducing the chance of malfunction. There are other effects.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional non-enclosed type relay, Fig. 2 is a perspective view of a conventional encapsulated type reed switch, Fig. 3 is an exploded perspective view of an embodiment of the present invention, and Fig. 4 is an exploded perspective view of the present invention. It is a block diagram which shows an example of the contact part based on. 11...Common base, 12...Movable contact spring, 13...Movable contact, 14...Fixed contact, 15...Fixed contact Terminal, 16...
...Backstop fixing terminal, 17...Backstop, 18.19...Electrical insulator, 20
... Drive coil, 21 ... Cover, 2
2... Iron core.

Claims (1)

[Scope of utility model registration request] A plurality of backstop fixing terminals made of a magnetic material arranged in a row and insulated and fixed vertically through the base on the upper side of the base; and one end fixed to each of the backstop fixing terminals and attached to the base. A rigid backstop made of a magnetic material extends substantially parallel to the backstop, and a peripheral surface such that the periphery is fixed uniformly to the backstop surface and the central portion serving as a movable contact can move in a direction perpendicular to the backstop surface. a movable contact spring made of a magnetic material having a plurality of notches between the spring and the entire backstop fixing surface side is in contact with the backstop surface; a plurality of fixed contacts made of a magnetic material, each of which is insulated and fixed to the base, and has a plurality of fixed contacts arranged in a line parallel to the backstop fixed terminal and opposite to the movable contact, and has a drive coil wound on the underside of the base; 1. An encapsulated electromagnetic relay comprising a terminal, and a cover that seals the outside including the backstop and the movable contact spring provided on the upper side of the base.