JPS5818186Y2 - Transmission switch device - Google Patents

Description

[Detailed description of the invention] This invention provides reed switches 2a and 2b inside a non-magnetic airtight container 1 at positions that open and close under the influence of an external magnetic field, and also seals the covered electric wire 3 connected to the receiver. The present invention relates to a transmission switching device in which the core wires 4a, 4b, 4c are connected to the reed switches 2a, 2b via the lead wires 5a, 5b, 5c.

For example, as shown in FIG.
Lead wire 5a to which 4c is soldered.

5b, 5c and the reed switches 2a, 2b were fixedly attached to the airtight container 1 using a step 7 as a guide surface.
1 reed switches 2a and 2b.

This force includes, for example, the tightening force when attaching this type of device to a water meter as a transmitter, and the expansion and contraction between the components of the transmitting switch device due to fluctuations in environmental conditions such as outside temperature. force caused by the difference, strain force caused by deformation of the component over time, core wires 4a, 4b, 4c and lead wires 5a, 5b when changing the pulling direction of the covered wire 3.
5c, and unreasonable force during assembly work due to the difficulty of assembly work.

As a result of these forces being applied, the reed switch 2a.

If the airtight seal near the poles of reed switch 2b becomes defective, or the glass part cracks, causing poor airtightness of reed switches 2a and 2b, air will enter the contact area and activate the sealed gas, resulting in oxidation and wear and tear of the contact. This has resulted in the disadvantage that the original lifespan of the reed switch cannot be maintained.

The applicant also applied for a "switch device for transmitting" (Utility Application 1986-2
No. 8215), reed switch 2a.

The holder 6 of 2b is made of a soft elastic material and the lead wire 5a.

An application in which 5b and 5c were constructed of electric wires with low rigidity was filed earlier.

In this case, lead wires 5a and 5b. There is almost no force passing through 5c, but the reed switch 2a.

The disadvantage remains that the holding condition of 2b closely surrounds the outer circumference of the glass part and there is no space around it, making it impossible to avoid the various forces caused by the other factors mentioned above. Ta.

In view of this, this invention alleviates the above-mentioned drawbacks, reduces the number of parts compared to the invention of the above-mentioned application, and facilitates assembly so that unnecessary force is not applied during the assembly of the reed switch. The purpose is to realize a switch device for

An embodiment of this invention is shown in FIGS. 2 and 3.

As shown in FIG. 4, the substrate 8 is formed by forming a plurality of conductive surfaces 8a, 8b, and 8c on an insulating plate 8d, and each conductive surface 8a,
8b, 8c include core wires 4a, 4b, 4c of the covered electric wire 3 and lead wires 5a, 5b, 5cm1.5 which have relatively low rigidity.
One end of cm2 is soldered.

The airtight container 1 is composed of two parts: a box 1a shown in FIGS. 5-7 and a lid 1b shown in FIGS. 8-9, and there are two protrusions 9a and 9b on the inner surface of the box 1a.

The board 8 has fitting holes 10a and 10b, which are fitted into the protrusions 9a and 9b, and fixed to the box 1a by heat caulking at a position covering the covered wire penetration part of the box 1a. .

In the internal space of the sealed container 1, between the side of the covered wire penetration part of the board 8 and the box 1a, the space on the surface side of the board 80 is filled with an insulating inlet 11 provided in the board 8. A filler is injected and cured to fill gaps between coated wires, core wires, strands, etc. to improve airtightness.

Further, in the space 12 on the back side of the substrate 8, an elastic holder 6 made of rubber and having a shape shown in FIGS. 10 and 11 is held in place while also holding bias magnets 13a and 13b.

Bias magnets 13a and 13b are reed switches 2a,
2b are closed only at a certain rotational position in the NS direction of the lines of magnetic force of a main drive magnet (not shown) that rotates in opposition to them, and the magnetization directions are opposite to each other for both reed switches. .

The four protrusions 6c of the holder 6 are located in the notch 1c of the box 1a.
It is positioned by mating with the (see Figure 5)
.

The holding body 6 has holding holes 14a and 14b through which the glass portions of the reed switches 2a and 2b are passed,
It holds its central part.

A portion of the portion surrounding the holding holes 14a, 14b is used as a thin wall portion 6a, 6b that can easily stretch within the elastic limit of the IJ-de switch 2.
a and 2 b are held with relatively weak force.

The lead wires 5a, 5b, 5c-1, 5c-2
The other end is soldered to the poles of reed switches 2a and 2b.

Since this soldering part is exposed from the box 1a, the soldering work is easy.

The holder 6 is tightened with a slight force between the substrate 8 and the inner surface of the lid 1b of the sealed container 1 only at parts other than the thin parts 6a and 6b which do not substantially affect the holding state due to its elasticity. Thin wall portion 5a.

The inner surface of the reed switch 6b is in close contact with the glass portion of the reed switch 2a t 2b, but the outer surface faces the space 12, and there is no solid portion in direct contact with the space 12.

The airtight container 1 is made of synthetic resin, and as shown in FIGS. 4 to 8, the box 1a, which is one of the two parts that make up the container, has a holding part 1d,
Two convex parts 1e are provided on each lid 1b, and the clamping parts 1d are made to expand elastically, and when fitted with the convex parts 1e of the lid 1b, are elastically tightened to prevent them from coming off easily.

In addition, 1g is a groove provided all around the outer surface of the fitting part between the box 1a and the lid 1b, and the adhesive is poured into this groove 1g, and the adhesive is applied to the gap between the fitting surfaces of the box 1a and the lid 1b. The material naturally flows in through capillary action, forming an adhesive layer to keep the mating surface airtight.

Furthermore, when the airtight container 1 is made of synthetic resin, its airtightness is inferior to that of metal, so a coating layer with good adhesion to the synthetic resin material is provided on the surface to improve airtightness. .

Next, an inert liquid such as liquid paraffin is introduced into the space 12 of the closed container 1 using the reed switch 2a.

If the reed switch 2b is sealed to the extent that it is completely submerged
The welded parts of the terminals a y 2 b will not be corroded by moisture, and since the volume of the space will be reduced, the air inside will expand due to a rise in outside temperature, deforming the sealed container or damaging the airtightness of the joint surface. water disappears, and moisture is removed from the reed switch 2a.
, 2b is no longer covered, so accidents such as cracking of the glass due to freezing do not occur.

With the above structure, the board 8 is firmly held in the closed container 1 and is not affected by the deformation of the covered wire 3, and the reed switch 2a t 2b has its glass portion attached to the holder 60 at a portion in its longitudinal direction. It is held by elasticity, and the holder 6 is fixed only in parts that do not substantially affect its holding state, and the lead wires connected to the poles of the reed switch have low rigidity, so the reed switch does not apply excessive force to the glass part. Reliably held in place without bending.

As a result, the above-mentioned drawbacks of the conventional ones are eliminated and the purpose is achieved.

Therefore, the lifespan of the contacts is not shortened, the original lifespan of the reed switch can be maintained, and it has the useful effect of improving the reliability of transmitting devices such as water meters.In addition, the number of parts is small and assembly is easy. Because of this, it can be assembled without applying excessive force to the reed switch, so the airtightness of the reed switch will not be compromised during assembly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional transmission switching device, FIG. 2 is a sectional view of an embodiment of the transmission switching device of this invention, and FIG. 3 is a sectional view taken along the line A-A in FIG. Figure 4 is a plan view of the conductor side of the board, Figure 5 is a sectional view of the box, Figure 6 is a view taken along the line B-B in Figure 5, and Figure 7 is a view taken along the line C-C in Figure 5. , FIG. 8 is a sectional view of the lid, FIG. 9 is a sectional view taken along the line D-D in FIG. 8, FIG. 10 is a plan view of the holder, and FIG.
It is an arrow sectional view. 1... Airtight container, 2a, 2b...
Reed switch, 3...Sheathed wire, 4a, 4b
, 4c... Core wire, 5a, 5b, 5c 1
t5c 2"" Lead wire, 6...Holding body, 1
2... Space on the back side of the board, (8d...
Insulating plate, 8a, 8b, 8c...conductor surface,)8.
·····substrate.

Claims (1)

[Claims for Utility Model Registration] 1. A reed switch is provided inside the non-magnetic sealed container 1 at a position that opens and closes under the influence of an external magnetic field, and
In a transmitting switch device in which a covered electric wire connected to a receiver is airtightly inserted and conductive to the core wire of the reed switch, an insulating substrate 8 is fixed in a sealed container so that both the front and back sides of the covered electric wire are connected to the covered electric wire. A space is formed facing the inner wall on the insertion side and the inner wall on the opposite side, and the core wire and one end of the lead wire having relatively low rigidity are connected and fixed on the surface of the substrate. The side space is filled with an insulating filler, and the back side space of the substrate is filled with an insulating filler.
A transmitting switch comprising: an elastic holder holding the central portion of the reed switch interposed between the back side of the substrate and the inner wall of the container; and the other end of the lead wire being welded to a pole of the reed switch. Device. 2. The transmitting switch device according to claim 1, wherein an inert liquid is sealed in the space 12 on the back side of the substrate.