JPS5836030Y2 - Liquid level detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid level detection device that detects the liquid level by actuating a reed switch using a magnetic float that is displaced in response to changes in the liquid level of liquid such as washer liquid in a container. In particular, the purpose is to stably support the reed switch, and to construct the reed switch so that the reed switch can be assembled easily and reliably without breaking the connection between the reed switch terminal and the lead wire. It is something to do.

In general, this type of device has a reed switch housed and fixed inside a hollow guide fixed to a suitable position in a container, and the terminal of the reed switch is fixed to a lead wire by soldering.
Generally, the lead wire is inserted into a hole in a lid fixed to the open end of the guide body and drawn out to the outside of the guide body for wiring. There is a high risk that the reed switch may be damaged due to excessive force applied to the connection between the reed switch terminal and the lead wire, or in extreme cases, the reed switch itself may be damaged. There is a risk that the mounting position of the reed switch may be incorrect, and therefore the reed switch must be assembled carefully, which requires a lot of time and effort, and is also a troublesome work.

The present invention solves the above-mentioned drawbacks, and an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a container in which liquid such as washer liquid is stored, and a mounting hole 3 formed in the bottom wall 2 of the container 1.
A liquid level detection device A protrudes inward from the bottom wall 2 and is fixed in a liquid-tight manner.

Reference numeral 4 denotes a hollow guide body made of, for example, thermoplastic synthetic resin, and a small-diameter portion 41 of the guide body 4 has a magnet 5 fixed to its inner peripheral surface, and a magnet-equipped float 6 that is displaced in response to changes in the liquid level.
When the magnetic float 6 is inserted, a stopper 7 for preventing the magnetic float 6 from coming off is fixed to the top of the small diameter portion 41 by heat caulking.

Further, an elastic packing 8 made of an elastic member such as rubber is fitted on the outer periphery of the guide body 4, and the elastic packing 8 is fitted into the mounting hole 3 of the bottom wall 2 in a liquid-tight manner on the outer periphery of the elastic packing 8. Groove 9
is formed.

Reference numeral 10 indicates a magnet 5 of the float 6 when the float 6 with a magnet, which is displaced in response to a change in the liquid level, falls to a predetermined liquid level.
A reed switch operated by the reed switch 1
0 is housed in the small diameter portion 41 of the guide body 4.

Reference numeral 11 denotes a step formed on the inner circumferential surface of the guide body 4;
has an insulating plate 1 having two independent conductive parts in a part thereof.
2 are in contact.

13 is a protective tube inserted into the terminal of the reed switch 10,
The terminal is fixed to the conductive portion of the insulating plate 12 through the protective tube 13 by soldering.

A lead wire 14 leads the terminal of the reed switch 10 to the outside, and the lead wire 14 is fixed to the conductive part of the insulating plate 12 by soldering. The terminal and lead wire 14 are connected.

Reference numeral 15 denotes a lid that closes the open end of the guide body 4;
is inserted inward from its open end so that its tip abuts the insulating plate 12, and the lead wire 14 is inserted through the columnar part 151 that locks the insulating plate 12 to the stepped portion 11 to open the open end. A closing flat portion 152 is integrally formed, and the flat portion 152 is fixed to the open end of the guide body 4 by heat caulking.

Reference numeral 16 denotes a holding member that prevents the lead wire 14 from coming off, and the holding member 16 is fixed to the lead wire 14 inside the lid 15 by hot caulking.

The assembly of the present device with the above configuration will be explained.

First, from the small diameter portion 41 of the hollow guide 4 to the elastic packing 8
After temporarily inserting the reed switch 10, the magnetic float 6 is fitted into the small diameter portion 41, and the stopper 7 for preventing the magnetic float 6 from coming off is fixed to the top of the float, and one terminal of the reed switch 10 is bent and the same When the protective tube 13 is inserted into the terminal of the reed switch 10, the protective tube 13 is inserted into the insulating plate 12, and the protective tube 13 is in contact with the insulating plate 12.
The terminal is fixed to the conductive part of the lid body 15 in advance.
The lead wire 14 inserted through the holding member 16 and the insulating plate 1
When the terminal of the reed switch 10 and the lead wire 14 are connected by fixing it to the conductive part 2 of 2, the columnar part 15 of the lid body 15
The holding member 16 is fixed to the lead wire 14 inside the flat part 152 of the lid body 15 with one tip in contact with the insulating plate 12,
Furthermore, is the insulating plate 12 secured to the tip of the columnar part 151?
The reed switch assembly is inserted from the open end of the guide body 4 and the reed switch 10 is housed in the small diameter portion 41 thereof, and the insulating plate 12 is locked to the stepped portion 11 by the columnar portion 151. By fixing the open end to the flat part 152 of the lid 15, assembly of the liquid level detection device A is completed.

In addition, when installing the device A in the mounting hole 3 of the bottom wall 2,
After the elastic packing 8 temporarily inserted into the guide 4 with the guide 4 protruding inward from the bottom wall 2 is pushed into the mounting hole 3 and the groove 9 is fitted, the guide 4 is inserted into the packing 8.
The device A can be attached to the bottom wall 2 of the container 1 in a liquid-tight manner by simply inserting the .

Therefore, in the present invention, when the protective tube 13 is inserted into the terminal of the reed switch 10, the protective tube 13 is inserted through the insulating plate 12.
3 is in contact with the insulating plate 12, and the above terminal is attached to the insulating plate 12.
When the terminal of the reed switch 10 and the lead wire 14 are connected by fixing the lead wire 14, which is fixed to the conductive part of the insulating plate 12 and passed through the lid 15 and the holding member 16, to the conductive part of the insulating plate 12, The tip of the columnar part 151 of the lid body 15 is connected to the insulating plate 12.
The holding member 16 is held in contact with the flat part 15 of the lid body 15.
2. The reed switch assembly is fixed to the inner lead wire 14 and the insulating plate 12 is fixed to the tip of the columnar part 151. The insulating plate 12 is placed on the stepped portion 11 and the columnar portion 1
51 and fixing the open end of the guide body 4 to the flat part 152 of the lid body 15, when assembling the reed switch 10, the terminal of the reed switch 10 and the lead wire 1 are secured.
4 is fixed to the conductive part of the insulating plate 12, the reed switch 10 is supported on the insulating plate 12, and the flat part 152 is fixed to the open end of the guide plate 4. The insulating plate 12 is connected to the integrally protruding columnar portion 151 at its tip.
can be locked to the stepped portion 11, and the reed switch 10
The reed switch 10 can be precisely supported and housed in the small diameter portion 41 of the guide body 4 without the installation position being shifted.

Therefore, by stably supporting and housing the reed switch 10 in the small diameter portion 41, the liquid level can be detected reliably.

Further, even if an unreasonable force is applied to the lead wire 14 during routing of the lead wire 14, the holding member 16 is locked to the inner surface of the flat portion 152 of the lid 15, so that the reed switch 10 can be The wire connection portion between the terminal and the lead wire 14 can be reliably and easily protected without breaking the wire connection portion.

As described in detail above, the present invention forms a step on the inner peripheral surface of the guide body and abuts an insulating plate having two independent conductive parts, and contacts the conductive part of the insulating plate with the terminal of the reed switch. is fixed to support the reed switch on an insulating plate, and a lead wire is fixed to the conductive part and the lead wire is connected to the terminal of the reed switch. A lid body integrally formed with a protruding columnar portion through which the lead wire is inserted and which locks the insulating plate to the stepped portion is fixed, and a holding member for preventing the lead wire from being pulled out is secured to the lead wire inside the lid body. As a result, the reed switch can be firmly and stably supported on the insulating board, and the reed switch can be reliably stored in the specified position without being misaligned when it is assembled. Even if excessive force is applied during wiring, the force will not directly act on the connection between the reed switch terminal and lead wire, reliably preventing breakage of the connection and damage to the reed switch itself. This has practical effects such as being able to economically construct a device that is easy to assemble and is highly durable.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of the present invention. 4... Guide body, 6... Float with magnet, 10...
Reed switch, 11... step part, 12... insulating plate,
14... Lead wire, 15... Lid body, 16... Holding member.

Claims (1)

[Scope of utility model registration request] A float with a magnet that is displaced in response to changes in the liquid level is fitted into a hollow guide body, a reed switch is housed in the guide body, and the reed switch is actuated by the float with a magnet to detect the liquid level. A step is formed on the inner circumferential surface of the guide body, and an insulating plate having two independent conductive parts is brought into contact with the guide body, and the terminal of the reed switch is fixed to the conductive part of the insulating plate. Supporting a reed switch on an insulating plate, fixing a lead wire to the conductive part and connecting the lead wire to a terminal of the reed switch, and inserting the lead wire into the open end of the guide body, and A liquid level detection device characterized in that a lid body integrally protruding from a columnar portion that locks an insulating plate to a stepped portion is fixed, and a holding member for preventing the lead wire from coming off is fixed to the lead wire inside the lid body. Device.