JPH01267921A - Sealed type relay - Google Patents

Abstract

PURPOSE:To compose a smaller and more compact relay with an insulation barrier, etc. unneeded to provide and a high withstand voltage characteristic kept by sealing ion hexafluoride within a housing. CONSTITUTION:Though the gap between a movable contact 32 and a fixed contact 13a becomes narrower or wider at the time of opening/closing a contact so that arc is apt to occur between them, the generation of so that arc is constrained with the ion hexafluoride, sealed within a housing, having a high insulation property and the shock and destruction voltage between contacts becoming high since the ion hexafluoride is sealed within the housing. For example, the shock and destruction voltage, of the relay electrode A in which the ion hexafluoride is sealed at a pressure of 2kg/cm<2> in the housing in which the contact mechanism having a 4mm air gap is housed between two facing spherical electrodes, is approximately two times that of the relay B in which a pressure air of 2kg/cm<2> is sealed. This causes the consumption of contacts 32 and 13a to be reduced and their functions kept as highly reliable contact mechanism for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealed relay, such as a relay or a switch, which includes a contact mechanism in a housing.

(Conventional technology and its issues) In recent years, based on the demand for smaller and more compact various devices,
8M devices such as relays and switches are also becoming increasingly smaller.

However, as these relays are made smaller, the distances between internal parts and contacts become shorter, resulting in insufficient insulation and lower withstand voltage.

Conventionally, therefore, a method has been adopted to ensure high voltage resistance by providing an insulating barrier between parts, but this has the problem that the U-electric appliance becomes larger by the amount of the insulating barrier.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned problems, and provides a sealed relay having a contact groove in the housing. It is filled with sulfur fluoride.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an electromagnetic uTri device, and this electromagnetic relay roughly consists of base 1. Electromagnetic block 2. Armature block 3. The base 1 and the case 4 form a housing.

■、Schematic configuration The configuration of each part will be explained below.

(i) Base 1 Base! is made of insulating synthetic resin, and the base body is made of insulating synthetic resin.
A housing portion opening upward is formed in O, and groove portions lOa, 10b, 1 are formed in the vertical direction on the outer side of the circle in the long side direction.
0b, lOc, and lOc are formed, respectively.

The groove portions 10b, lOc are distributed symmetrically to the left and right with the groove $lOa as the center, and the groove portions 10a, 10b,
10c has a common terminal for each! 2. Fixed contact terminal 13. Coil terminal! 4 lead portions are positioned respectively.

The upper part of each terminal 12, 13, 14 is embedded and integrated into the base body IO, and the tip contact portions 12a, 12a of the common terminal I2 are formed approximately at the center in the long side direction of the base body IO. The fixed contacts 13a of the fixed contact terminals 13 are exposed on the upper surface of the pedestal 15 formed at the four corners of the accommodating portion 11, and the contact portions 14a of the coil terminals 14 are exposed on the upper surface of the pedestal 15. A welding electrode connected to the outside of the base body 10 is inserted into the bottom surface of the recess 16 formed on the inside in the short side direction and exposed to the bottom surface of the recess 16 which is lower than the base portion 15, and connected to the outside of the base body 10 on the back surface of the coil terminal contact portion 14a. Guide part 1
7 is formed in the bottom of the base l, through holes 19. Seal 9 is pierced.

(ii) Electromagnet block 2 The electromagnet block 2 roughly consists of an iron core 20. Spool 23.
Coil 27. It is composed of a permanent magnet 28.

As shown in FIG. 3, the iron core 20 is formed by bending both ends of a rectangular plate made of magnetic material upward to form magnetic pole pieces 21a and 21b facing each other on both sides of the iron core body 22, and one magnetic pole piece 21a. The upper end portion of the iron core body 22 is further bent outward to form a horizontal portion 21c that is substantially parallel to the core body 22.

The permanent magnet 28 has a long, rectangular shape with magnetic poles formed on the upper and lower sides, and is disposed approximately at the center of the core body 22.

The spool 23 is attached to the core 20 so as to cover the core body 22.
It is integrally formed with the flange portions 24 and 24 at both ends.
is formed, and a holding part 29 which also serves as a flange part is formed between these, and the permanent magnet 28 is integrally held in the holding part 29 with its upper part exposed. On the upper surface and on both end sides of the iron core 20, grooves 29a having a semicircular cross section in the longitudinal direction of the iron core 28 are provided as bearing parts.
29a is formed.

The coils 27 are respectively wound between the collar portion 24.24 and the holding portion 29, and the ends are electrically connected to the coil winding portions 26 of the relay terminal 25 integrally molded on the collar portion 21.21. It is connected.

(iii) Armature block 3 The armature block 3 includes the armature 30. Movable contact piece 31.3
1. It is composed of a support section 36.

The armature 30 is a rectangular plate made of magnetic material, and the movable contact piece 31 has a so-called twin structure contact mechanism on both ends, each having a movable contact 32, and a central portion extending laterally. to form a lead-out portion≦4, and connect the tip of the lead-out portion to the armature 30.
There is a T-shaped contact connecting piece 33 extending along both sides to form a wing part 35. placed,
The armature 3 is supported by the insulating support portion 3B made of synthetic resin.
It is integrated into 0. However, in an integrated state,
- The T-shaped connection piece 33 projects from the side of the support part 36.

As shown in FIG. 3, on both sides of the lower surface of the support part 36,
Corresponding to the grooves 29m and 29a of the electromagnet block 2, there are formed protrusions 37 and 37 whose tips have a semicircular cross section with a diameter smaller than that of the groove 29a, and the height thereof is equal to that of the protrusions. 37, 37 is a concave groove 29a.

29a, a slight gap is created between the lower surface of the armature central portion 30m and the upper surface of the permanent magnet 28.

(iv) Case 4 The case 4 is made of synthetic resin and has a box shape that can be attached to the base l.

■The assembly of an electromagnetic relay consisting of one or more assemblies will be explained.

First, in Figure 2, base! Housing part 1! Attach electromagnet block 2 to. In this state, electromagnet block 2
The relay terminal 25 is connected to the base body 1 as shown in Fig. 3.
It is located on the coil terminal connection portion 14a of No. 0. However, in this embodiment, as shown in FIG.
Since the height (h,) from the bottom surface of 4 to the bottom surface of the relay terminal 25 is set slightly higher than the height (h, ) from the bottom surface of the housing section 11 to the top surface of the coil terminal contact section 14a, The relay terminal 25 and the contact portion 14a are separated from each other.

Therefore, one electrode of a welding machine (not shown) is inserted upward from the guide portion 17 (see FIG. 2) and comes into contact with the lower surface of the coil terminal contact portion 14a, and the other electrode is inserted into the upper surface of the relay terminal 25. The relay terminal 25 is elastically deformed and pressed against the coil terminal contact portion 14a, and the two are welded and integrated.

Therefore, due to the restoring force of the relay terminal 25 itself, the electromagnet block 2 is temporarily fixed while being pressed against the base 1. And this electromagnetic block 2 is a base! This will be permanently fixed during the case 4 sealing process.

Note that when welding the relay terminal 25 and the contact portion 14a using a laser or the like, the terminal 25 and the contact portion 14a are overlapped with the electromagnetic block 2 mounted on the base 1. Also, the information department! 7 is unnecessary.

Next, as shown in FIG. It is supported so as to be swingable in directions a and a'.

Both ends of the armature 30 are connected to the magnetic pole piece 21 of the electromagnet block 2.
a, 21b, and there is a working space S between them.
, S are formed, and based on the magnetic force of the permanent magnet 28, the permanent magnet 28. A magnetic circuit connecting the 20° iron core and the armature 30 is formed.

As shown in FIG. 1, the single-shaped connecting piece 33 of the movable contact piece 31 has its wing portions 35 and 35 connected to the common terminal contact portion 12a, respectively.
, 12a, and the movable contact 32 faces the fixed contact 13a, and as shown in FIG. 3, when the armature block 2 is operated in the direction of arrow a (a'), ) are in contact with the fixed contact 13a, while the left (right) contacts 32 and 13a are spaced apart to form a working space S.

Next, the tip sides of the wing portions 35.35 of the single-shaped connecting piece 33 are welded to the connecting portions 12a, 12a, respectively, to electrically connect the two.

In addition, in the single-shaped connecting piece 33, the lead-out portion 34 is thin;
In addition, the wing portion 35 has a semicircular notch 34 at its root.
a (see FIG. 1) is formed, the torsional resistance of the lead-out portion 34 and the bending rigidity of the root of the wing portion 35 are small, and the swinging motion of the armature block 3 can be performed smoothly.

Next, the base l with the internal components installed as described above.
A case 4 is mounted on the outside, and a sealing resin 5 is filled between the base l and the case 4 to seal the space between them.

Finally, the air inside the housing is extracted through the through hole 19.19, and replaced with sulfur hexafluoride (SF).
After sealing, the through holes 19 and 19 are respectively filled with sealing resin 5 and sealed.

At this time, the resin 5 filled in the through holes 19 and 19 flows into the gap between the bottom inner surface of the base 1 and the electromagnet block 2, as shown in FIGS. Penetrates between the surface windings.

Therefore, when the sealing is completed and the resin 5 is thermally hardened, the electromagnetic block 2 is firmly fixed to the base 1 via the resin 5.

1 [1, Electromagnetic coupling formed as described above? The operation of the Tf device will be explained.

In a non-excited state where no current is applied to the coil terminal i4, between the magnetic pole pieces 21a and 21b of the iron core 20, the magnetic pole piece 21a has a larger opposing area with the armature 30, which disrupts the left and right magnetic balance. Therefore, the armature 30 is
The state shown in FIG. 3 is maintained by moving in the direction shown in FIG.

Coil terminal! By applying a current to the left and right coils 27, 27 through the coils 4 and excitation of the iron core 20 by switching the direction, the armature block 3 forms a groove 29a and a convex strip, as shown in FIG. 37 as a fulcrum, the movable contact 32 is moved toward and away from the fixed base 13a by swinging in the direction of arrow a or a° force.

In addition, when opening and closing the contacts, the movable contact 32 and the fixed contact 13a
The gap between the two becomes narrower or wider, satisfying one of the factors in the environment where arcs are likely to occur between the two.

However, the sulfur hexafluoride sealed in the housing has high insulating properties, and the impact breakdown voltage between the contacts is high, so the occurrence of burns is suppressed.

Specifically, in a housing containing a contact mechanism having an air gap of 4 m between two opposing spherical electrodes,
The impact breakdown voltage of relay A, which is filled with sulfur hexafluoride at a pressure of 2 kg/cm2, is approximately twice that of relay B, which is filled with pressurized air of 2 kg/cm2.

Therefore, the contact points 32.13a have little wear and tear and function as a highly reliable contact mechanism over a long period of time.

■.Other Examples In the above embodiments, only sulfur hexafluoride is sealed in the housing, but the housing is not limited to this, and a gas containing a mixture of sulfur hexafluoride and nitrogen at a predetermined ratio may be filled. You can do it like this.

(Effects of the Invention) As is clear from the above description, in the relay according to the present invention, sulfur hexafluoride is sealed in the housing, so even if the insulation distance between the parts is short, it can withstand high voltage. Become.

Therefore, there is no need to provide an insulation barrier or the like, and a smaller and more compact relay can be constructed while maintaining high withstand voltage characteristics.

Furthermore, due to the presence of sulfur hexafluoride, less arcing occurs between the contacts, and wear of the contacts is extremely reduced, so that a high degree of contact reliability can be obtained over a long period of time.

[Brief explanation of the drawing]

1 to 4 show an electromagnetic relay to which the present invention is applied, in which FIG. 1 is a plan view, FIG. 2 is an exploded perspective view, and FIG.
FIG. 4 is a sectional view taken along the line I--1 in FIG. 1, and FIG. 4 is a sectional view taken along the line ■--■ in FIG.卜...Base, 4...Case, 13a...Fixed contact, 32...Movable contact.

Claims (1)

[Claims] (1) A sealed relay including a contact mechanism in a housing, characterized in that sulfur hexafluoride is sealed in the housing.