JPS5836026Y2 - Liquid meter safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a liquid level meter suitable for automatically measuring fuel consumption time and engine rotation speed based on a preset constant volume of liquid fuel in an internal combustion engine.

Conventionally, in order to measure the fuel consumption time of an internal combustion engine based on a preset constant volume of liquid fuel, the fuel is
To count the highly accurate time pulse signals passed through a gate circuit that opens and closes when a predetermined amount of consumption is consumed, and to measure the engine rotation speed, open and close the gate circuit for a certain period of time using a reference signal emitted from a crystal oscillator. The engine is configured to count pulse signals responsive to the engine speed that have passed through the gate circuit.

As shown in Fig. 1, the liquid level meter A that sets the liquid fuel at a constant level includes an air bleed device 1 that removes air bubbles, a constant oil pressure tank 2 that stores a fixed amount, a burette 3 made of hard glass, and various electromagnetic valves. It has a liquid amount control device 12 consisting of an electric circuit etc. that drives and controls this, and liquid fuel introduced from a main tank (not shown) through an inlet IN is passed through an air bleed device 1 and a solenoid valve 4 to a constant hydraulic tank 2. At the same time, it is also sent to the internal combustion engine from the outlet (outlet) via the solenoid valve 5.

Further, the constant hydraulic pressure tank 2 is fed to the buret 3 via the solenoid valve 6, and the buret 3 and the outlet OU
Since the solenoid valve 7 between T is in a closed state, the burette 3
When it is filled to a preset capacity, the light emitting element 9...
A detector at a predetermined position consisting of a light-receiving element 10 is activated, and the solenoid valve 6 is closed, and a certain amount is stored in the constant oil pressure tank 2, and the float switch 8 is activated, and the solenoid valve 4 is closed. Obstruction.

Next, when a measurement start push button (not shown) is operated, the electromagnetic valve 5 is closed and the electromagnetic valve 7 is opened, and the fuel in the buret 3 is fed into the internal combustion engine and consumed, and the fuel consumption time at this time is and counting of the engine rotational speed is started.

When the liquid level in the buret 3 reaches a set lower limit position, that is, when a predetermined amount is consumed, the detector detects this, stops counting, and displays the consumption time.

Further, a manual valve 11 is inserted between the inlet IN and the outlet OUT, which can be opened in an emergency such as when the liquid meter breaks down.

Such a liquid level meter consists of a front wall and a rear wall each having a window hole through which the burette 3 can be monitored, and the front wall is configured to be able to be opened and closed or detached from the rear wall to enable internal inspection. It was housed in a straight burette stand.

For this reason, the conventional burette stand does not have good airtightness, and if the burette 3 is damaged, highly flammable liquid fuel will leak from the burette stand to the outside, which is extremely dangerous. When each of the electromagnetic valves is in an operating state, there have been various problems such as liquid fuel continuing to flow out from a damaged buret.

In view of the above circumstances, the present invention has been designed to effectively prevent liquid fuel from leaking to the outside from the burette stand when the burette is damaged, and also to stop the introduction of liquid fuel into the burette. An oil storage tank is attached to the lower part of the straight casing in which the burette is installed, and the oil storage tank communicates with the inside of the casing. It is an object of the present invention to provide a safety device for a liquid level meter which is equipped with a float switch for stopping a liquid level control device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a safety device for a liquid meter according to the present invention will be described below with reference to the drawings.

Referring to FIGS. 2 and 3, B is a burette stand, which is equipped with an oil storage tank 21 with a top opening larger than the capacity of the buret 3 on a base 20, and furthermore, on this oil storage tank 21 there is a burette stand. It is made up of a front wall 23 and a rear wall 24, each having a window hole 22 for inspection of the let, and the front wall 23 is attached with a straight casing 25 with an opening at the bottom that can be attached to and detached from the rear wall 24 or can be opened and closed. It is.

In this case, the inside of the straight casing 25 and the inside of the oil storage tank 21 are communicated with each other.

Furthermore, a float switch 26 is installed in the oil storage tank 21, which is activated when the liquid fuel reaches a level that is approximately equal to or slightly larger than the capacity of the burette 3.
An overflow indicator light 27 is provided which lights up when the float switch 26 is operated, and a drain cock 28 is provided to discharge the liquid fuel stored inside to the outside.

On the other hand, the liquid level gauge A having the above-mentioned configuration is installed inside the straight casing 25, and an air vent 29 of the constant hydraulic pressure tank 2 and a draw-out port 30 between the inlet IN and the outlet OUT are provided. Each solenoid valve 4,5°6.
7 and the float switches 8 and 26 are provided with an outlet 31 for connecting an external circuit including a power source.

In the above configuration 3, if the buret 3 were to break, liquid fuel would flow out from the breakage into the straight casing 25 and be stored in the oil storage tank 21.

When a predetermined amount of oil is stored in the oil storage tank 21, the float switch 26 is activated and the drive of the liquid amount control device 12 is stopped.
゜6.7 is closed or liquid volume control device 1
It is recommended to cut off the power supply of 2.

As described above, according to the safety device of the liquid meter according to the present invention,
Even if the buret is damaged for some reason, the liquid fuel is stored in the oil storage tank, so there is no risk of it leaking to the outside.Moreover, once the specified amount of liquid fuel is stored in the oil storage tank, Since the float switch is activated and the burette's liquid level control device stops operating, no more liquid fuel is sent to the damaged buret, and it completely stops functioning as a liquid level meter. Therefore, safety can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the oil flow circuit of the liquid meter, FIG. 2 is a right side view of the burette stand, and FIG. 3 is a front view of the burette stand. 3...Buret, 12...Liquid volume control device, 21...Oil storage tank, 26...
・Float switch.

Claims (1)

[Scope of utility model registration request] An oil storage tank that communicates with the inside of the casing is attached below the straight casing in which the burette is installed, and when the oil storage tank reaches a level higher than the required level, the oil storage tank is activated to control the liquid level of the buret. A safety device for a liquid meter, characterized by having a built-in float switch that stops the operation of the device.