JPS584288B2 - level gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a level gauge, and more specifically, a first resistor and a second resistor are arranged to face each other with a certain gap, and are deformed by liquid level pressure so that they mutually interact. This relates to a level gauge that comes into contact with the

Conventionally, as this type of level gauge, one having the structure shown in FIG. 1 is known.

That is, an arm 51 having a substantially L-shaped cross section is held so as to be able to swing about a fulcrum 53 .

A float 55 is attached to one end of this arm 51, and a slide contact 57 is formed at the other end.

Furthermore, a resistor 59 is arranged to be slidable on the slide contact 57.

In the level gauge having such a structure, the float 55 is displaced following the displacement of the liquid level 61, and the displacement movement of the float 55 causes the arm 51 to swing around the fulcrum 53.

As a result, the slide contact 57 moves while sliding on the resistor 59, and the connection between the first cable 63 connected to one end of the resistor 59 and the second cable 65 electrically connected to the slide contact 57 is caused. The output is displaced.

The level gauge according to the prior art described above has the following drawbacks.

(1) Attach the float 55 to the arm 51, and
Since the structure detects the displacement of the device, the overall size of the device becomes large and it is vulnerable to vibration.

(2) Since the sliding contact 57 and the resistor 59 are structured to slide, poor contact may occur or the contact portion may wear out prematurely.

The present invention eliminates the drawbacks of the conventional products mentioned above, and will be described in detail below with reference to the drawings.

Explaining based on FIGS. 2 to 4, a rod-shaped main body 5 made of resin has a groove 7 extending along the main body 5. As shown in FIG.

Further, the first resistor 1 is attached to the bottom surface 8 of the groove 7.

Further, the groove portion 7 is closed with a resin film 9 to form a space 11.

Furthermore, a second resistor 3 is attached to the surface of the resin film 9 on the side of the space 11 so as to face the first resistor 1 .

On the other hand, a first cable 13 is connected to the first resistor 1, and a second cable 15 is connected to the second resistor 3.

The resin film 9 is usually made of polyester resin, polyimide resin, glass-filled epoxy resin, etc., and has a thickness of about 12 to 50 μm, and the first resistor 1 has a thickness of about 50 to 100 μm. Materials such as nickel chrome alloys and stainless steel with

Further, as the second resistor 3, a copper foil or the like having a thickness of about 20 to 50 microns is used.

That is, although the first resistor 1 is a resistor,
As the second resistor 3, an electric conductor was used.

When the level gauge according to the present invention having the above-mentioned configuration is immersed in the liquid level, the liquid level pressure causes the second resistor 3 and the resin material The film 9 deforms toward the first resistor 1, and the first resistor 1 and the second
The resistors 3 are brought into contact with each other.

Further, a ventilation hole is usually provided in a portion of the main body 5 that is not immersed in liquid and absorbs a change in volume within the space 11 when the second resistor 3 and the resin film 9 are deformed.

The electrical circuit of the level gauge described above is as shown in FIG.
is grounded, and the first cable 13 connected to the first resistor 1 is connected to a level display meter 17.

On the other hand, a resistor, a switch, and a power source are connected in series to the level display meter 17.

Furthermore, by improving part of the electrical circuit of the level gauge shown in Fig. 5 to the structure shown in Fig. 6, the liquid level 1
9 becomes below a certain alarm level.

That is, a contact 21 independent from the first resistor 1 is provided on the lower end side of the first resistor 1, and the contact 21 is connected to a third cable 23, and the second resistor 3 is connected by hydraulic pressure. The structure is designed to allow contact with the

Also, similar to the circuit shown in FIG. 5, the second cable 15 connected to the second resistor 3 is grounded, and the first cable 13 connected to the first resistor 1 is leveled. It is connected to the display meter 17.

Furthermore, in addition to the level display meter 17, the first cable 13 and the third cable 23 are equipped with a first resistor 25, a second resistor 27, a third resistor 29, an alarm lamp 31, and a switch 3.
3, a power source 35 and a transistor 37 are connected.

Because of this structure, when the liquid level falls below the alarm level, the cables 23 and 3 are no longer in contact with each other.
3 is separated from the ground, and as a result, a current flows through the base of the transistor 37, an amplified current flows between the collector and emitter of the transistor 37, and the alarm lamp 31 lights up.

On the other hand, in the embodiment described above, the first resistor 1 and the second resistor 3 are foil-shaped, but as shown in FIG.
Either the resistor 1 or the second resistor 3 may be wire-shaped.

Furthermore, the main body 5 itself is used as the first resistor 1 or the second resistor 3, and the resin film 9 itself is used as the first resistor 1.
Alternatively, the second resistor 3 may be used.

Furthermore, as shown in FIG. 8, a chamber 39 communicating with the space 11 may be provided at the upper end of the thin plate-like main body 5, and an inert gas may be sealed in the space 11 and the chamber 39.

On the other hand, the entire level gauge including the main body 5 is attached to the cylindrical member 4.
In this case, small holes are provided in the lower and upper peripheral surfaces of the cylindrical member 41 to allow liquid to enter into the cylindrical member 41.

As a result of the present invention having the above-described configuration, the following effects can be expected.

That is, since the entire device can be made into a thin plate rod shape, the entire device can be made compact.

Furthermore, unlike conventional devices, there are no moving parts or sliding contacts, so there is no wear and contact failure is less likely to occur.

Furthermore, the number of parts is small, making it possible to manufacture the product at a lower cost than conventional products.

In addition, the main body 5 is made of a resin material, and the resin film 9 is made of a resin material.
In the case of using the embodiment, the main body 5 and the resin film 9 can be welded together by high frequency or the like, and assembly can be easily performed.

Further, as shown in FIG. 8, when a chamber 39 is provided and the chamber 39 and the space 11 are filled with inert gas, the first resistor 1 and the second resistor 3 are Oxidation, contamination, etc. can be effectively prevented, and since the chamber 39 is provided, pressure fluctuations in the space 11 due to displacement of the liquid level 19 can be reduced.

Furthermore, as illustrated in FIG.
In the case of covering the meter needle with water, it is possible to eliminate minute vibrations of the meter needle caused by waves on the liquid surface.

Note that the main body 5 is the first resistor 1, and the resin film 9 is
If the second resistor 3 is used instead, an insulating material must be interposed so that the main body 5 and the second resistor 3 do not come into direct contact.

Further, in the embodiment, the first resistor 1 is a resistor and the second resistor 3 is a conductor, but the first resistor 1 and the second resistor 3 may be resistors.

Furthermore, in order to improve the sensitivity when the liquid level is low, the gap between the first resistor 1 and the second resistor 3 is narrower at the lower end (liquid level side) and narrower at the upper end. It is preferable that the width gradually widens toward the sides.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing a level gauge according to the prior art;
Fig. 2 is a cross-sectional view of one embodiment of the level gauge according to the present invention, Fig. 3 is a longitudinal cross-sectional view of the level gauge shown in Fig. 2, and Fig. 4 is the same as Fig. 2. Figure 5 is a conceptual diagram showing the electric circuit of the level gauge shown in Figure 2, Figure 6 is the diagram shown in Figure 5. FIG. 7 is a cross-sectional view of another embodiment of the present invention, and FIG. 8 is a diagram showing a further embodiment of the present invention. FIG. 9 is a vertical cross-sectional view of the embodiment, and FIG. 9 is a vertical cross-sectional view of the level gauge of the present invention covered with a cylindrical member. DESCRIPTION OF SYMBOLS 1...First resistor, 3...Second resistor, 5...Main body, 7...Groove, 8...
...Bottom surface, 9...Resin material film, 1
1... Space, 13... First cable, 15... Second cable, 17...
Level display meter, 19...Liquid level, 21...
...Contact, 23...Third cable, 25
...First resistance, 27...Second resistance,
29...Third resistor, 31...Alarm lamp, 33...Switch, 35...Power supply, 37...Transistor, 39.・・・・・・
Room, 41... Cylindrical member, 51... Arm, 53... Fulcrum, 55... Float, 57... Slide contact, 59...
Resistor, 61...Liquid level, 63...1st
Cable, 65...Second cable.

Claims (1)

[Scope of Claims] 1. A main body 5 having a rod shape and having a groove 7, and a plate shape and having flexibility, which is attached to the main body 1 and cooperates with the groove 7 to form a space 11. The resin film 9 to be formed, the bottom surface 8 of the groove 7 facing each other, and the film 9
A first resistor 1 is attached to one surface of the bottom surface 8 and the other surface of the film 9 to maintain a constant gap with respect to the first resistor 1. 2 resistors 3, and the film 9 is deformed by hydraulic pressure so that the first resistor 1 and the second resistor 3 are brought into contact with each other. gauge. 2. The level gauge according to claim 1, wherein either one of the first resistor 1 and the second resistor 3 is an electric conductor.