JPS6017702Y2 - Liquid level detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid level detection device for detecting the level of liquid such as radiator liquid for automobiles.

A conventional device of this kind is shown in Fig. 1. 1 is a resin case that houses the reed switch and wire leads, 2 is a resin holder that serves as a clamp for the reed switch and wire leads, and 3 is a resin case that moves up and down as the liquid level fluctuates. moving float,
4 is a magnet for driving the reed switch, 5 is a reed switch, 6 is a stopper, 7 is a rubber gasket for preventing water intrusion, and 8at8b is a wire lead whose tip is soldered to each terminal of the reed switch 5.

In this configuration, the case 1 and the holder 2 are arranged such that the reed switch 5 is positioned by abutting the lower part 2a of the holder 2 against the lower step part 1a of the case 1, as shown in part 2.

At the same time, the upper part of holder 2 is press-fitted into case 1, and
The constriction part 1b at the upper end of is constricted in three places.

However, in the above configuration, a gap is provided as shown in ■ in order to abut the part ■ in Fig. 1, but in this structure, the press-fitting jig creates an additional overpressure hole by the amount of this gap, so there is always a gap in the part ■. This creates a state where stress is applied, causing the case to crack due to temperature cycles, and at the same time, it is difficult to manage the press-fitting jig so that stress is not applied to the part (■) due to dimensional variations in each part. .

In order to solve the above problem, this invention gives the holder a spring property by cutting out several places in the holder, which absorbs and relieves the stress in the part (■) generated by the overpressure hole. The purpose of this is to make it possible to make abutment in (2) by relaxing the above, and to facilitate the management of press-fitting jigs.

The present invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 2 to 4, reference numeral 1 denotes a resin case that houses a reed switch, a holder, and a wire lead, and is fixed to the radiator upper tank with screws.

2 is a resin holder integrally formed with clamp parts 2c and 2d for clamping the reed switch 5 and wire leads 8a and 8b, and is press-fitted into the case 1 until it hits the part . It is fixed by tightening it in three places.

Further, the position of the reed switch 5 with respect to the magnet 4 is determined by the contact with the part (■).

3 is a float that moves up and down as the liquid moves, and 4 is a magnet fixed to the float 3 to open and close a reed switch 5.

5 is a reed switch, and 6 is a stopper for the float 3, which is fixed to the lower end of the case 1 by thermal tightening.

7 is a rubber cap for preventing water from seeping into the case, and 8a and 8b are wire leads soldered to each terminal of the reed switch 5.

The holder 2 is provided with collar portions 2at2b at the lower and upper portions, and there are several locations (three locations in the figure) between the upper collar portion 2b of the holder 2 and the wire lead clamp portion 2C.
Notches 2e are provided alternately.

Further, the case 1 includes a lower step portion 1a that receives the lower collar portion 2a of the holder 2, and an upper step portion IC into which the upper collar portion 2b of the holder 2 is press-fitted.

Next, the operating principle in the above configuration will be explained.
When the liquid is above the detection level, the magnet 4 does not magnetically act on the reed switch 5 and does not generate an alarm.

When the liquid is below the detection level, the magnet 4 descends,
The magnetic force acts on the reed switch 5, and when the reed switch 5 is closed, an alarm is issued.

In such an operating system, the position of the reed switch 5 is important, so by touching the lower collar part 2a of the holder 2 with the reed switch 5 fixed against the lower step part 1a of the case 1 as shown in I am trying to locate it, but
By cutting out the holder 2 as described above, it is possible to relieve stress during positioning (press-fitting) and to facilitate management of the press-fitting jig.

Experimental example...In the case shown in Figure 1, after pressing the ■ part and press-fitting by an additional 1m/m, 50kg will be placed in case 2.
A load of 7m is applied, but in the one in Figure 2, it is 2.3~
2.8 kg/sequential relaxation.

It should be noted that the shape of the notch 2e provided in the holder 2 is not limited to the embodiment shown in FIG. 2, and it goes without saying that there are many possible shapes.

As described above, in the present invention, when the holder is press-fitted into the case, the lower flange 7 of the holder hits the lower step of the case, and the reed switch is positioned.
At this time, an overpressure hole is formed by the press-fit jig until the upper flange of the holder hits the upper step of the case, but the holder is elastically deformed due to the notch provided between the upper flange and the lower flange. The stress applied to the lower step of the case from the lower flange of the holder can be alleviated, preventing the case from cracking, and the deformation caused by the cutout of the holder makes it easier to manage the press-fitting jig. This has an excellent effect.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a conventional device, FIG. 2 is a vertical sectional view showing an embodiment of the device of the present invention, and FIGS. 3 and 4 are front and side views of the resin holder in the device shown in FIG. 2. It is. 1...Resin case, 2...Resin holder, 2e...Notch, 3...Float,
4...Magnet, 5...Reed switch, 8a, 8b...Wire lead.

Claims (1)

[Scope of utility model registration request] In a liquid level detection device that detects the liquid level by opening and closing a reed switch using a magnet that moves in response to a float, and in which a resin holder for clamping the reed switch and a wire lead from the reed switch is press-fitted and fixed in a case. , the holder has an upper collar at the top, a reed switch clamp at the bottom, a lower collar above the reed switch clamp, and a wire clamp between the lower collar and the upper collar,
The case has a notch for imparting spring properties to the holder between the upper flange and the lower flange, and the case further includes a lower step for receiving the lower flange of the holder and an upper flange of the holder. A liquid level detection device comprising: an upper step portion into which a portion is press-fitted;