JPH0729545Y2 - Sealed relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sealed relay in which a case is hermetically formed.

(Prior Art) This type of sealed relay has a characteristic that it can be used even under adverse environment conditions such as high temperature and high humidity and has high contact reliability, and is widely adopted.

Conventionally, this type of relay has a base 2 made of a magnetic material in which lead terminals 1a, 1b, 1c, 1d are enclosed and attached by glass, a cover 3, and a base, as illustrated in FIGS. 6 and 7. And a polar electromagnet 8 on which the permanent magnet 5 and its magnetic pole plates 6 and 7 are disposed on the movable free end side of the armature 4 facing the armature 4 and the armature 4 and substantially parallel to the armature 4. The movable contact spring 9 driven by this, and a pair of contact plates 10A and 10B arranged on both sides of the spring 9 in the moving direction.
It is mainly composed of. Then, the base 2 and the cover 3 are welded together to form a closed case, and nitrogen gas is sealed inside. Further, the coil iron core 8A of the polarized electromagnet 8 and the magnetic pole plate 7 are fixed to the base 2, and the contact spring 9 and the contact plates 10A and 10B are welded to the lead terminals 1a to 1c.

(Problems to be solved by the invention) By the way, the characteristics of this type of relay are as follows:
It greatly depends on the interval of B (securing the withstand voltage) and the position (distance) relationship between the contact plate 10A and the magnetic pole plates 6 and 7.

Therefore, highly accurate parts, welding jigs, and assembling technology are required, which is a problem in terms of workability. This invention was devised by paying attention to the above-mentioned actual situation, and its purpose is to reliably and accurately position each component that influences the characteristics of the relay, and to perform the assembly and welding work. The purpose is to provide a sealed relay that is easy, low cost, and has stable characteristics.

(Means for Solving the Problem) In order to achieve the above object, the present invention has taken the following technical means.

That is, the invention is directed to a polarized electromagnet provided on a base made of a magnetic material and provided with a permanent magnet and its magnetic pole plate facing the movable free end side of the armature, and substantially parallel to the armature. A sealed relay comprising a movable contact spring which is provided and driven by the movable contact spring, and a pair of contact plates which are arranged on both sides of the movable free end of the movable contact spring in the moving direction. The point is that the permanent magnet, the magnetic pole plate and the contact plate are fitted and fixed in the respective positioning recesses of the holding body made of an insulating material and fixed to the base.

The holder is preferably made of a synthetic resin having a low volatile gas and high dimensional stability, for example, an aromatic polyester resin.

Further, the positioning recess of the holder may be a substantially square through hole for the permanent magnet and the magnetic pole plate, and a concave groove for both contact plates.

(Operation) According to this invention, the holding body is fixed at a predetermined position on the base, and the magnetic pole plate is fitted and fixed in the holding body with the permanent magnet sandwiched between the magnetic pole plate (magnet core side) and the base. Then, a pair of contact plates are fitted and fixed to the holder, and one ends of the contact plates are fixed to the lead terminals. Therefore,
The distance between the pair of contact plates and the positional relationship between the contact plates and the pole plates are
The holding body ensures reliable and accurate positioning, and even when a fixing operation (for example, a welding operation) is performed, the related position is ensured without deviation.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 11 is a relay case made of a magnetic metal material, and is composed of a flat plate-shaped base 12 and a box-shaped cover 13 that is fitted into the base 12 and has an open lower surface. A flange 14 is projectingly provided on the lower end opening edge of the cover 13,
The case 11 is hermetically sealed by stacking the flange 14 on the base 12 and fixing the flange 14 to the base 12 by a method such as welding. Note that the relay case 11 is filled with an inert gas such as nitrogen gas.

Further, a plurality of lead terminals 15a to 15e are inserted into the base 12, and the lead terminals 15a to 15e are supported by an insulator 16 such as glass and fixed to the base 12 so as to maintain airtightness, so-called hermetic The seal is made.

Reference numeral 17 denotes a holder made of an insulating material, which has a substantially L shape when viewed from the front and is fixed on the base 12, and has a pole plate and a permanent magnet positioning recess formed in the upper part in the left-right direction and having a substantially square through hole. Office 18 is provided. A contact plate partition wall 19 is provided on the lower side of the recess 18, and a groove-shaped normally-closed contact plate positioning recess 20 parallel to the partition wall 19 is formed at the front and rear of the partition wall 19. Above the left end, the normally closed contact plate collar and the normally open contact plate positioning recesses 21 and 2 that are located vertically and are parallel to each other.
Two are provided.

The recess 18 has permanent magnet positioning projections on the front and rear walls.
23 are provided, and groove portions 24, 25 formed above and below the ridge 23
A pair of upper and lower magnetic pole plates 26, 27 (the upper side is also referred to as a magnetism collecting plate)
The front and rear ends are fitted and positioned, and the permanent magnet 28 is fitted and positioned and fixed between the two magnetic pole plates 26, 27. The lower magnetic pole plate 27 has a substantially inverted L shape when viewed from the front and is also referred to as a magnet iron core. An engaging protrusion 27b is formed at the lower end of its leg 27a and is formed at the left end of the base 12. It is fitted into the engagement recess 12a and fixed by welding.

29 is a normally closed contact plate, 30 is a normally open contact plate, which is a pair of upper and lower,
The normally closed contact plate 29 on the upper side is provided with a flange portion 29a and is fitted into the recesses 20 and 21 of the holding body 17, and the normally open contact plate 30 on the lower side is fitted into the recess 22 of the holding body 17, The contact plates 29, 30 are positioned and fixed by the holder 17, and then fixed to the lead terminals 15d, 15b by welding.

Reference numeral 31 is a polar electromagnet, and the magnetic pole plates 26 and 27 and the permanent magnet 28
, A coil core 32, and a coil frame 34 around which the coil 33 is wound.
And an armature 36 which is inserted into the coil frame 34 and whose one end is held by a holding spring 35. The lower end of the coil core 32 is provided with an engaging protrusion 32a, and the base 12
It is fitted in the engaging recess 12b formed at the right end of and is fixed by welding. The leg portion 34a of the coil frame 34 is erected on the base 12 and is insulated from the base 12 by an insulating base 37.
Is provided, and the coil terminal 33a is the lead terminal 1 at the right end.
Connected to the top of 5e.

The right end of the armature 36 is sandwiched between the upper end surface of the coil iron core 32 and the holding spring 35 fitted to the coil frame 34, and the middle part of the armature 36 swings up and down in the coil frame 34. It is freely inserted. Also, armature 36
The left end portion of is inserted between the pair of upper and lower magnetic pole plates 26, 27, and is positioned such that the end surface is close to the permanent magnet 28.

Reference numeral 38 denotes a card, which has a through hole 39 in the left-right direction in the upper part, the armature 36 is inserted in the through hole 39, and spring locking grooves 40 are formed in the lower front and rear sides.

41 is a movable contact spring, which is fitted and locked in the spring locking groove 40 of the card 38 so that the left end is located between the contact plates 29 and 30, and the supporting projection 41a at the lower right end is welded to the lead terminal 15c. Has been done.

The magnetic pole plate 27 and the coil iron core 32 can be fixed to the base 12 by adhesion.

In this way, since the magnetic pole plates 26, 27 and the permanent magnet 28 are positioned and fixed after the holder 17 is fixed to the base 12 with an adhesive or the like, an appropriate magnetic gap with a predetermined gap is formed between the magnetic pole plates 26, 27 and the permanent magnet 28. g is secured.

Next, the operation of the above embodiment will be described. Fourth
The figure shows a non-excited state of the polarized electromagnet 31, and in this state, the armature 36 contacts the magnetic pole plate 26, whereby the permanent magnet 28, the magnetic pole plate 27, the base 12, the coil core 32,
A magnetic path including the armature 36, the magnetic pole plate 26, and the permanent magnet 28 is formed, the armature 36 is held in a state of being attracted to the magnetic pole plate 26, and the card 38 brings the movable contact spring 41 into contact with the normally closed contact plate 29.

Here, when the coil 33 is energized so as to cancel the attractive force that the armature 36 receives from the magnetic pole plate 26, the gap between the armature 36, the coil iron core 32, the base 12, the magnetic pole plate 27, and the magnetic pole plate 27 and the armature 36 is generated. , A magnetic path called armature 36, armature 36, coil iron core 32, base 12,
Two magnetic paths are formed: the cover 13, the gap g, the magnetic pole plate 26, the gap between the magnetic pole plate 26 and the armature 36, and the magnetic path of the armature 36. Then, since the latter magnetic path acts so as to cancel the magnetic force of the permanent magnet 28 on the side of the magnetic pole plate 26, the attractive force acting on the armature 36 from the magnetic pole plate 26 is weakened by the permanent magnet 28, and apparently to the armature 36. The attraction force from the magnetic pole plate 27 will be increased. In this way, it is possible to increase the difference in the attraction force between the non-excited state and the excited state on the magnetic pole plate 27 side.

On the other hand, since the magnetic path is bifurcated, the armature
When the armature 36 approaches the magnetic pole plate 27, the attractive force acting on the armature 36 from the magnetic pole plate 27 becomes smaller on the magnetic pole plate 27 side. As a result, the attraction force of the magnetic pole plates 27 and 26 with respect to the armature 36 becomes substantially equal, and the movable contact spring
If the load of 41 is applied to the armature 36, the connection with the spring load will be easier. Further, when the unexcited state is changed to the excited state shown in FIG. 2, a larger attractive force is applied to the armature 36 than in the conventional example, so that the armature 36 operates with higher sensitivity than in the conventional example. is there.

In the above embodiment, the contact plates 26 and 27 are described as two sets of front and rear, but one movable contact spring 41 can be driven by the card 38 to form a relay provided with one set of contact plates. .

As shown in FIG. 5, groove-shaped contact plate positioning recesses 21, 22
The contact plates 29, 30 can be press-fitted and fixed by projecting projections 42, 43 on the base plate.

Further, the holder 17 and the insulating base 37 may be integrally molded as one component.

According to the above-mentioned embodiment, both magnetic pole plates 26, 27 are spaced, both contact plates 29,
The intervals of 30 and the positional relationship between the magnetic pole plate 27 and the contact plate 29 all depend on the dimensional accuracy of the holder 17, that is, the molding accuracy, and the dimensional accuracy of the relay building block can be made extremely high. A positioning jig for welding with 15d is not required, and workability is significantly improved.

The specific structure of the holder 17 in the present invention is not limited to the above-mentioned embodiment, and the design can be changed appropriately.

(Effect of the Invention) As described above, in the hermetically sealed relay according to the present invention, the permanent magnet, the magnetic pole plate and the contact plate are fitted and fixed in the respective positioning recesses of the holding body fixed to the base. The positional relationship and the dimensional accuracy thereof can be secured at a high level, a stable and high-performance relay with no characteristic variations can be obtained, and the assembly is easy and the workability can be improved.

In addition, the holding body can be further improved in dimensional accuracy and stability of characteristics by integrally molding with a synthetic resin material having low volatile gas and high dimensional stability.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of the entire relay, FIG. 2 is a central longitudinal front view, and FIG. 3 is an enlarged exploded perspective view of essential parts. FIG. 4 is an operation explanatory view in a non-excitation state, FIG. 5 is a partial perspective view showing another example of the contact plate positioning recess, and FIGS. 6 and 7 are a vertical sectional front view and a horizontal sectional view showing a conventional example, respectively. Is. 12 …… base, 17 …… holding body, 18,20,21,22 …… positioning recess, 26,27 …… pole plate, 28 …… permanent magnet, 29,30 ……
Contact plate, 31 ... polarized electromagnet, 36 ... armature, 41 ...
… Movable contact spring.

Claims (4)

[Scope of utility model registration request] 1. A polarized electromagnet, which is provided on a base made of a magnetic material, and which is provided with a permanent magnet and its magnetic pole plate facing the movable free end side of the armature, and substantially parallel to the armature. A sealed relay comprising a movable contact spring which is provided and driven by the movable contact spring, and at least a pair of contact plates arranged on both sides of the movable free end of the movable contact spring in the moving direction. And a contact plate fitted into and fixed to each positioning recess of a holder made of an insulating material fixed to the base. 2. The hermetically sealed relay according to claim 1, wherein the holder is integrally formed of a synthetic resin material having a low volatile gas and high dimensional stability. 3. The hermetically sealed relay according to claim 2, wherein the holder is made of an aromatic polyester resin. 4. The hermetically sealed relay according to claim 1, wherein the positioning recess of the holding member is a through hole having a substantially square shape for the permanent magnet and the magnetic pole plate, and a concave groove for both contact plates.