JPS592503Y2 - 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 in automobile radiators, washers, etc.

Referring to FIG. 1, the construction of a conventional device will be described. Reference numeral 1 denotes a rubber gasket, which seals a sensor mounting portion on the bottom wall of a tank (not shown).

2 is a resin case, and a stopper 4 is fixed to the upper end.

Reference numeral 5 denotes an annular float that moves up and down depending on the liquid level, and an annular permanent magnet 6 for driving the reed switch 7 on the inner peripheral side.
is stored.

The reed switch 7 is housed in the case 2, and one end is soldered to the lead wire 10a via the bake plate 8, and the other end is soldered to the lead wire 10a via the wire lead 9 as described above.
It is soldered to b and connected to an alarm lamp, etc.

In addition, the bake plate 8 is positioned and fixed by the step inside the case 2 and the resin plate base 3.
The other end is tightened and fixed by the lower end of the case 2.

However, in the above-described conventional liquid level detection device, the float 5 easily follows changes in the liquid level.
Even if the liquid level is sufficient, a warning will be issued if there are large fluctuations in the liquid level such as when the car suddenly starts or stops.
Furthermore, when the liquid level is near the alarm level, there is a drawback that chattering occurs due to driving on rough roads, etc.

Additionally, in order to eliminate the above-mentioned drawbacks, conventional methods have covered the outer circumference of the float with a cylindrical body to alleviate the sudden vertical movement of the float, but the structure is complex and requires a lot of man-hours to manufacture. There were other problems.

In order to solve the above problem, the present invention integrates a cylindrical part at one end of the case, contacts this cylindrical part and covers the entire periphery of the float with a synthetic resin cylindrical body, and An object of the present invention is to provide a liquid level detection device that can alleviate sudden vertical movement of a float with a simple and easy-to-manufacture structure by forming a radial hole that communicates the inside and outside at the contact part with the cylinder part. There is something to be said.

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

In FIG. 2, reference numeral 1 denotes a rubber gasket that seals a sensor mounting portion on the bottom wall of the tank (not shown).

Reference numeral 2 denotes a resin case that houses the reed switch 7, etc., and a resin-made cylindrical body 11 for preventing rocking is fastened to the upper end of the case, and the open end side of the lower end of this cylindrical body 11 is connected to a float, which will be described later. 5 and covers the entire circumference of the float 5.

A cylindrical portion 2a is integrally formed at the lower end of the case 2.

Furthermore, at the point where the case 2 and the cylindrical body 11 fit together, a notch 2b is formed in the cylindrical portion 2a of the case 2 as shown in FIG.
and a semicircular groove 2C are provided, and the other peripheral edge is stepped 2d, and the cylindrical body 11 has a flange 11b having a semicircular groove 11a and a step in the opposite direction to the stepped 2d of the cylindrical portion 2a. By providing the grooves 11C, a radial drain hole is formed by the semicircular grooves 2C and lla when the two abut against each other.

At this time, the notch portion 2b of the cylindrical portion 2a has the role of positioning the hole and stopping rotation.

Further, the upper surface of the cylindrical body 11 has three air vent holes 11d formed in the axial direction as shown in FIG.

5 is an annular float that moves up and down depending on the liquid level, and an annular permanent magnet 6 for driving a reed switch 7 is housed on the inner peripheral side.

The reed switch 7 is housed in the case 2, and one end thereof is soldered to the lead wire 10a through the bake plate 8, and the other end is soldered to the lead wire 10b through the wire lead 9 as described above. It is connected to a warning lamp, etc.

Furthermore, the bake plate 8 is positioned and fixed by the step inside the case 2 and the resin plate base 3, and the other end of the plate base 3 is tightened and fixed by the lower end of the case 2.

In addition, stopper projections 2e and 11e are provided at the portions of the case 2 and the cylindrical body 2 that the float 5 comes into contact with, respectively.

The rubber packing 1 is fitted into a cylindrical portion 2a at the lower end of the case 2, and the cylindrical portion 2a is press-fitted from below into a hole provided in the bottom wall of the tank via the rubber packing 1.

According to the above configuration, even when the liquid level in the tank fluctuates rapidly due to driving on rough roads, sudden starts, or sudden stops, liquid can enter and exit through the semicircular groove 2c.

11 only in the hole formed by a,
Fluctuations in the liquid level inside the cylindrical body 11 are alleviated and malfunctions do not occur.

In addition, since three holes 11d are provided on the top surface of the cylindrical body 11, the operating position of the reed switch 7 is inspected by inserting an inspection jig through the three holes 11d and moving the float 5 up and down at the same time as air is removed. can do.

In addition, at the fitting part between the cylindrical part 2a of the case 2 and the cylindrical body 11, a notch 2b, a semicircular groove 2C, and a stepped part 2d are provided in the cylindrical part 2a, The burr 11b, the semicircular groove 11a, and the step 1 in the opposite direction to the cylindrical portion 2b.
By providing 1C, each groove 2
C.

11a constitutes a drain hole, and the notch 2 of the cylindrical portion 2a
The hole is positioned and prevented from rotating by b.

In the above-described embodiment, the notch 2b and the protrusion 11b are used to prevent rotation, but the rotation is not necessarily required.

In addition, in the embodiment described above, the axial hole 11 d was provided on the upper surface of the cylindrical body 11, but this hole 11 d is provided in the upper corner of the cylindrical body 11 or the upper step plane. Even if it is provided, it can be easily formed when the cylindrical body 11 is molded.

Further, in the embodiment described above, the cylindrical body 11 and the cylindrical portion 2
Although the hole is formed by providing semicircular grooves 11a and 2C in both the cylindrical body 11 and the cylindrical part 2b, the groove may be formed in either one of the cylindrical body 11 and the cylindrical part 2b, and the shape of the groove It does not have to be semicircular, but may be triangular, quadrilateral, etc.

Furthermore, the cross-sectional shapes of the cylindrical body and the case 2 do not have to be circular, but may be polygonal or other shapes.

As described above, in the present invention, a cylindrical part is integrally formed at the lower end of the case, and the open end of the lower end extending to the lower position of the float is brought into contact with this cylindrical part, and the entire circumference of the float is covered with a synthetic resin cylindrical body. Since we have formed an axial hole in the contact area between the cylindrical body and the cylindrical part that communicates the inside and outside, the hole that communicates the inside and outside can be easily molded with resin without the need for post-processing. It can be formed using a simple mold structure, which makes it possible to alleviate sudden vertical movement of the float with a simple and easy-to-manufacture structure.
The shape of the hole provided in the contact portion may be small, and therefore, there is an excellent effect that not only can the inflow and outflow of fluid be sufficiently alleviated, but also the strength of the cylindrical body and the cylindrical portion can hardly be reduced.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a conventional device, Fig. 2 is a longitudinal sectional view showing an embodiment of the device of the present invention, Fig. 3 is a right side view of the main part of the device shown in Fig. 2, and Fig. 4 is a longitudinal sectional view showing an embodiment of the device of the present invention. FIG. 2 is a plan view of the device shown in FIG. 2...Case, 2a...Cylinder part, 2C,
lla...Semicircular groove forming a radial hole,
5...Float, 6...Permanent magnet, 7
...Reed switch, 11 ... Cylindrical body, 11 d ... Hole in the axial direction.

Claims (1)

[Scope of utility model registration request] a reed switch, a synthetic resin case that houses the reed switch, a float that is arranged around the outer periphery of the case and moves up and down depending on the liquid level, and a float that is fixed to the float and that opens and closes the reed switch. In a liquid level detection device having a permanent magnet, a cylindrical portion integrally molded with the case from synthetic resin is provided at the lower end of the case, and an open end side of the lower end extending to a lower position of the float is brought into contact with the cylindrical portion. a synthetic resin-type cylindrical body that covers the entire periphery of the float and is fixed to the case; a radial hole is formed at the contact portion between the cylindrical body and the case to communicate inside and outside; A liquid level detection device characterized in that an axial hole is also formed on the opposite end of the cylindrical body to communicate between the inside and outside.