JPS5854678Y2 - liquid level detector - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a detection device for detecting the amount of liquid (paint).

Conventional methods include a weight measurement method and a liquid level detection method using a float, but the former is expensive and structurally large, while the latter has paint that sticks to it, making it inoperable, and the signal power source is explosion-proof and expensive.

The high-pressure paint is fed remotely, and when the paint is emptied and air enters the supply circuit, the paint will stick inside the tube, similar to cholesterol buildup, and this will cause problems in the feed.

Also, if air accumulates, you won't be able to get a perfect spray and the painted surface will be poor.

It would be unreasonable for workers to constantly monitor the situation to prevent such incidents, and if they are doing part-time work, they may forget.

This invention solves these problems and is small, lightweight, and inexpensive.
The purpose of the present invention is to provide a simple liquid level detector that is less likely to malfunction.

An embodiment of the present invention is shown in Fig. 1. 1 is an inner pipe which is a primary air pipe, and 2 is an outer pipe which is a secondary air pipe, forming a double pipe. An air distribution block 3 is provided, and a gland packing 4 and a packing suppressor 5 are provided between the air distribution block 3 and the inner pipe 1 to prevent air leakage.

The double tube is inserted vertically into the paint 6 and attached to the paint container top 7 at the air distribution block 3.

The lower end of the outer tube 2 forms a valve body 8, and a diaphragm 9 made of synthetic resin is fixed to the peripheral edge with a suppression nut 10. It is designed to be sealed.

A guide plate 11 for the diaphragm 9 is attached to the outside of the diaphragm 9.

The primary air conduit 12 is connected to the reset cock 13 at the tip of the inner tube 1.
are connected via.

A secondary air conduit 14 is connected to the air distribution block 3 .

15 is the bottom surface of the paint container.

FIG. 2 is a signal circuit diagram showing the operation of the detector shown in FIG. It is being

19 is an air drain adjustment valve.

20-1 and 20-2 are front red signal lights, and 21 is a buzzer.

This invention uses a solvent with a low flash point for paint, so
Detection using explosion-proof equipment is required, and the detector inside the paint container uses an air-tight differential pressure valve opening/closing method.

Next, to explain the operation of the present invention, the double pipe is fixed to the upper part 7 of the container with a gap of 30 to 50 mm from the bottom surface 15 of the container, and the amount (depth) to be detected below the liquid level is measured by the valve body 8. The amount to be detected (
Depth) h is determined by the following formula: Pass the set primary air pressure from the primary air conduit 12 through the noset cock 13, and apply primary air pressure from the primary air conduit 1 to the seat surface of the valve body 8.

When the paint 6 decreases and the pressure resistance of the diaphragm 9 decreases, the diaphragm 9 overcomes the primary air pressure,
The seat portion of the diaphragm 9 begins to open, and the primary air passes through the inside of the valve body 8 from the secondary air pipe 2 to the secondary air conduit 14.
, the pressure switch 18 is activated, and the electric signal changes the signal light from blue 20-1 to red 20-1, and at the same time the buzzer 21 sounds to notify the decrease in the amount of liquid and replenish the liquid.

In order to set the detector again, the primary air is temporarily cut off by the reset cock 13, and then the reset cock 11 is opened to bring it into the detection state.

The signal circuit also sends air so that the equipment can be remotely displayed, and a signal light and buzzer were installed outside the paint warehouse (where workers can see it) so that the situation can be checked at any time.

The reset cock 13 may be attached to the secondary air conduit, and the primary air and secondary air may be reversed.

As described above, the present invention consists of a double tube consisting of an inner tube and an outer tube that are inserted vertically into a liquid, and a peripheral portion of the double tube that is fixed to the outer tube at the lower end of the double tube. A diaphragm seals the lower end of the inner tube when hydraulic pressure is applied, and air introduced into the inner tube (or outer tube) pushes the diaphragm against the hydraulic pressure and is introduced into the outer tube (or inner tube). Since the liquid level detector consists of a detection means for detecting the amount of paint, conventionally, if the liquid level inside the tank was not constantly monitored when a detector was not available, the assembly line work would be temporarily interrupted and the paint would be refilled due to running out of paint.

This eliminates the problem of paints curing when air enters, or defects caused by dry-spraying, which was wasted on rework.

Additionally, by using synthetic resin as the material for the diaphragm, it has excellent effects such as being solvent resistant and able to withstand repeated movements without deformation.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a structural diagram of a displacement detector, and FIG. 2 shows a detection means using a signal circuit. 1: Primary air pipe, 2: Secondary air pipe, 3: Air distribution block, 6: Paint, 8: Valve body, 9: Diaphragm, 12: Primary air conduit, 13: Reset cock, 14:
Secondary air conduit, 16: Pressure switch mounting base, 17: Safety valve, 1 &: Pressure switch, 20-1, 20-2: Signal light, 21: Buzzer

Claims (1)

[Scope of utility model registration request] A double pipe consisting of an inner pipe and an outer pipe is inserted vertically into a liquid, and when the lower end of the double pipe has a peripheral edge fixed to the outer pipe and a liquid pressure of a predetermined level or more is applied from below, A diaphragm seals the lower end of the inner tube, and when air introduced into the inner tube (or outer tube) pushes the diaphragm against the hydraulic pressure and is introduced into the outer tube (or inner tube), A liquid level detector comprising a detection means for detecting.