JPS5925332B2 - Polar reed relay - Google Patents

Description

[Detailed description of the invention] This invention relates to a polarized reed relay.

Generally, a polarized reed relay has a lead with a movable contact, a fixed contact, and an excitation coil wound around the lead.
It consists of a permanent magnet that excites the movable contact and the fixed contact.Functionally, the fixed contact and the lead have both electric and magnetic properties, and the contact gap is the electrical insulation between the contacts and the gap in the magnetic circuit. It has the characteristic that it constitutes a section.

The structure of a conventional reed relay with this kind of function is
It is as shown in FIGS.

That is, this reed relay is divided into two parts, each consisting of a coil frame, a lead fixing part provided at one end, and a magnet assembly part provided at the other end, to form a half-coil frame 1a.

lb, half lead fixing parts 2a, 2b, half magnet built-in part 3a,
3b and mold these halves separately to form half A.
, B, and further includes a coil conductor winding portion 4,
The coil terminal 5, the output terminal 6, the common terminal 7, and the L-shaped sensing portions 8a, 8b are insert-molded to form the L-shaped sensing portions 8a, 8.
The opposite end of b (determine the contact point).

), the fixed contacts 9a and 9b are joined to the half-lead fixing part 2b, the lead 10 is fixed to the half-lead fixing part 2b so as to face inside the half-coil frame 1b, the magnet 3 is loaded in the half-magnet incorporating part 3b, and then the half A,
B are joined to each other, a coil 11 is wound around the coil frame, and the coil frame is further covered with an iron cover 12 and a bottom cover 13.

Note that 14 is a fitting portion between halves A and B, 15 is a coil relay terminal, and 16 is a relay terminal fixing groove.

However, this reed relay has an L-shaped wire pole part 8at s
When joining fixed contacts 9a, 9b to b, fixed contacts 9a,
There was a problem in that the fixed contacts 9a and 9b tended to tilt in their length direction (arrow C in FIG. 1) due to warpage during manufacture of the contact 9b and a difference in the balance of bonding pressure.

Also, the opposing faces of halves A and B, especially the half coil frames 1a and 1b.
Because a slight warp is formed on the joint surface of
The contact gap accuracy, which is determined by the molding accuracy of , H and the manufacturing accuracy of the fixed contact, is affected by these, resulting in variations in accuracy, variations in magnetic attraction force characteristics, variations in normally closed/normally open contact pressure, etc. This has resulted in problems such as increased difficulty in setting the open circuit voltage, reduced contact life, and increased contact bounce.

Furthermore, since the coil 11 must be wound and soldered after the fixed contacts 9a and 9b are installed, the fixed contacts 9a and 9b must be wound and soldered.
There was also the problem that solder flux adhered to the contact surface of 9b, making the contact resistance unstable.

Therefore, as a conventional means for stabilizing the contact gap, it has been considered to form a pair of spacers integrally with the coil frame, and to position magnetic pole pieces on both sides of the spacers so that they face each other.

However, if a tilt occurs in the movable contact during welding of the lead, there is a drawback that it is difficult to check and correct the tilt because of the spacer.

Furthermore, since the leads are inserted into very small gaps between the magnetic pole pieces, positioning and assembly of the leads is not easy.

Furthermore, the mold for forming the coil frame requires a slide core portion, which makes the mold structure complicated and shortens the mold life.

Therefore, the purpose of this invention is to form a polarized type that can simplify lead positioning and assembly, facilitate checking and correction when the movable contact is tilted, and simplify mold structure. The purpose is to provide a reed relay.

An embodiment of this invention is shown in FIGS. 6 to 9.

That is, in this polarized reed relay, a coil frame 18 having an upper opening 17, a lead fixing part 19, and a contact holding part 20 are integrally molded, and at the same time, a single terminal plate (cut after molding to form a coil terminal 5) , coil winding part 4, common terminal 7
, a ground terminal 7' is formed.

) and one of the magnetic pole plates 21 are insert-molded to form a relay main body P without dividing into two.

The contact holding part 20 of the relay main body P has a contact insertion groove 22 and a magnet insertion space 23 simultaneously molded on the inserted magnetic pole plate 21, and a contact material is partially plated or pasted in a foil form. The contact 24 is inserted into the contact insertion groove 22 and joined to the magnetic pole plate 21.

On the other hand, the contact block 25 that is attached to the contact holder 20 of the relay main body P to create a contact gap has a pair of contact gap determining spacers 26 and a pair of mounting guides 27 simultaneously molded, and a magnetic pole having an output terminal 28. The plate 21' is insert-molded in a cantilevered manner.

As shown in FIG. 8, the fixed contact 24' is inserted between the cantilevered magnetic pole plate 21' and the spacer 26 with a slight press fit so as not to damage the contact surface, and is positioned in contact with the wall surface 29, and the laser beam is emitted. The magnetic pole plate 21' and the fixed contact 24' are connected by means such as welding.
to join.

The contact block 25 is attached to the contact holder 20 using the attachment guide 27 so that the surface 30 of the spacer 26 comes into contact with the surface of the fixed contact 24 installed on the relay main body P.

In addition, when a fixed contact is used only for one side, the other fixed contact functions simply as a stator that determines the contact gap.

In this way, the polarized reed relay of this embodiment has the contact block with the spacer separated from the coil frame, and the fixed contacts are positioned on both sides of the spacer, so it has the following effects. .

That is, (1) since the contact gap is formed by the spacer and fixed contacts that are positioned in contact with both sides of the spacer, there is no problem of inclination as in the prior art, and the accuracy of the contact gap can be stabilized.

Moreover, since the spacer can be integrally molded with the contact block by molding means, the accuracy of the space width is reliable and no variation occurs at all.

Further, since the fixed contacts simply come into contact with both surfaces of the spacer, the operation is extremely simple and it is possible to easily obtain a contact gap with high accuracy and no variation.

In this way, the high precision of the contact gap stabilizes the characteristics of the magnetic circuit, making it possible to realize a relay with high sensitivity and high contact pressure.

(2) The fixed contacts are held on (the magnetic pole plates of) the contact block using bonding means, but this work does not require extreme precision.

In other words, even if a tilt occurs during bonding, as long as the spacers are in accurate contact, the magnetic and electrical characteristics will not be affected.

(3) The coil can be wound around the coil frame and soldered before installing the fixed contact, so solder flux does not adhere to the surface of the fixed contact as in the conventional case.
This makes it possible to stabilize the electrical characteristics.

(4) Since the entire device is not divided into two parts, the number of parts and assembly man-hours can be reduced, improving manufacturing efficiency.

(5) Since the contact block with the spacer is configured separately from the relay body, if the movable contact is tilted with respect to one of the fixed contacts 24 during welding of the lead 10, the area around the contact opens and restricts the movement of the lead. There's nothing to do, so it's easier to check and fix.

Reed 10 holds the long and slender root part and fits into very small gaps.
Since there is no need to insert the lead, assembly of the lead is easy and accurate positioning of the lead is possible.

Furthermore, the mold for forming the coil frame does not require a slide core part, resulting in a simple structure and improved mold life.

As described above, in the polarized reed relay of the present invention, since the contact block with the spacer is constructed separately from the relay body, the gap between the magnetic pole pieces is stabilized, and the tilt of the movable contact can be corrected and checked. This has the effect of making lead positioning and assembly easier, and furthermore, simplifying the mold structure and improving its life.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of a conventional polarized reed relay, Figure 2
3 is a sectional view taken along line m-■, FIG. 4 is a sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a longitudinal sectional view of the polarized reed relay, The figures are an exploded perspective view of a polarized mold-drily relay according to the first embodiment of the present invention, FIG. 7 is a partial plan view thereof, FIG. 8 is a longitudinal sectional view thereof, and FIG.
The figure is a half-sectional side view. 18... Coil frame, 19... Lead fixing part, 20...
...Contact holding part, 21.21'...Magnetic pole plate, 24.2
4'... Fixed contact, 25... Contact block, 26.
...Spacer, P...Relay body.

Claims (1)

[Claims] 1. A relay body with a lead fixing part provided at one end of the coil frame and one fixed contact held at the other end, and a relay body that is attached to this relay body and faces the end of said one fixed contact. and a contact block having a contact gap determining spacer and holding the other fixed contact facing the one fixed contact via the spacer.