JPS5912969Y2 - Oil-water separation automatic drainage device - Google Patents

Description

[Detailed description of the invention] This invention introduces oil mixed with water in the oil tank of a screw compressor into the float chamber, separates it into oil and water due to the difference in specific gravity, and the oil is filtered and returned to the oil tank. However, it relates to a device that automatically drains water to the outside.

Regarding this, in the past, a manual valve was installed at the bottom of the oil tank, and the water that had settled at the bottom of the oil tank was manually opened and drained, and when oil started coming out, the manual valve was closed. Depending on the person, the screw compressor would malfunction due to excessive oil output, or the oil would deteriorate due to leaving too much water in or forgetting to drain the water.

Considering the above points, this invention connects the oil tank and the float chamber containing the reed switch with two pipes, and installs a circulation pump in the middle of one of the pipes.
The oil mixed with water in the oil tank is introduced into the float chamber, where it is separated into oil and water due to the difference in specific gravity.The oil is filtered and sent back to the oil tank, and the water floats up to a certain water level. Then, a normally closed solenoid valve is opened to automatically drain water to the outside.

The present invention will be explained in detail below with reference to the drawings.

1 is a power switch for a motor 2 that drives a screw compressor (not shown).

3 is a float chamber, in which a reed switch 7 including a float 9 is attached to the inside of the bottom cover 5, and a filter 14 is attached to the inside of the top cover 12.

The filter is for filtering out dust.

The upper cover 12 is connected to an oil tank of a screw compressor (not shown) through a pipe 20.

A circulation pump 18 is provided in the middle of the piping 20 and receives power from the power circuit of the motor 2 that drives the screw compressor.

The upper side wall of the float chamber 3 is connected to the above-mentioned oil tank by a pipe 21.

The circulation pump 18 circulates between the oil tank and the float chamber 3 through pipes 21 and 20.

A normally closed solenoid valve 26 is connected to the side wall of the float chamber bottom 16 by a pipe 25.

A normally closed solenoid valve opens the valve when current flows through the operating coil 27, and closes the valve when no current flows.

30 is a relay, and when no current flows through the operating coil 31, the movable contact 35 closes the normally closed contact 33 as shown by the solid line, but when current flows through the operating coil 31, it is energized and the movable contact 35 closes. is for closing the normally open contact 34 as shown by the dotted line.

The float 9 is fitted onto the outer periphery of the reed switch 7 so that it can float up and down using the outer periphery of the reed switch 7 as a guide.

The float 9 does not float on oil with low specific gravity, but has the property of floating on water with high specific gravity.

The reed switch 7 is moved when the float 9 rises to a certain water level and closes the switch, and opens when the water level is below a certain level.

The reed switch 7 is connected to the power supply circuit of the motor 2 through which the operating coil 31 of the relay passes.

The operating coil 27 of the normally closed solenoid valve 26 is the normally open contact 3 of the relay.
4. Pass through the movable contact 35 and common terminal 32 shown by dotted lines,
It is connected to the power supply circuit of the motor 2.

28 is a flow rate regulating valve that opens and closes the outlet of the normally closed solenoid valve 26.

Next, the operation of the present invention will be explained.

When the power switch 1 is closed, the motor 2 drives the screw compressor, and at the same time the circulation pump 18 also operates, so the oil floating above in the float chamber 3 is sucked up, filtered by the filter 14, and sent to the pipe 20. As a result, the oil is pumped to an oil tank (not shown).

Therefore, the oil mixed with water that accumulates in the oil tank is sent to the float chamber 3 through the pipe 21.

Due to the difference in specific gravity of the oil mixed with water that enters the float chamber, the oil floats upward and is sucked up by the circulation pump, filtered, and returned to the oil tank.

Since water is heavy, it collects at the bottom of the float chamber.

Since the oil mixed with water is continuously sent from the oil tank to the float chamber, the amount of water gradually increases, and when the float 9 rises to a certain water level, the reed switch 7 is touched and closes.

Therefore, current flows through the operating coil 31 of the relay and excites it,
Since the movable contact 35 closes the normally open contact 34 as shown by the dotted line, current flows to the operating coil 27 of the normally closed solenoid valve and energizes it.
The normally closed solenoid valve 26 opens and the water in the float chamber is discharged to the outside.

When the water level in the float chamber falls and the float sinks, the reed switch 7 opens the switch, so the excitation current is cut off to the operating coil 31 and the movable contact 35 opens the normally open contact 34.

Therefore, the excitation current to the operating coil 27 is also cut off, and the normally closed solenoid valve is closed, completing the discharge of water.

There is oil mixed with water in the oil tank, and water accumulates in the float chamber while the circulation pump is operating, so the above-mentioned draining operation is performed periodically.

As explained above, the automatic oil-water separation and drainage device of the present invention uses a circulation pump to force circulation between the oil tank and the float chamber. The water is separated into oil and water, and the oil is filtered and sent back to the oil tank.The water is automatically drained every time it reaches a certain water level, minimizing the amount of water and dust mixed in with the oil in the oil tank. This helps prevent wear on the screw compressor, and it also helps save oil, as it prevents the oil necessary for operating the screw compressor from deteriorating due to contamination with water and dust.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of the oil-water separation automatic drainage device of the present invention.
The main parts are shown in cross section.

Claims (1)

[Scope of utility model registration request] In the float chamber 3, a reed switch 7 including a float 9 is installed inside the bottom lid 5, and a filter is installed inside the top lid 12. The upper side wall of the float chamber is connected to the oil tank via piping 21, and a circulation pump 18 is installed in the middle of the piping to obtain power from the power circuit of the motor 2 that drives the screw compressor. A normally closed solenoid valve 26 is connected to the side wall of the bottom part 16 by a piping 25, and a relay 30 is separately provided to connect the electric circuit of the reed switch 7, which is connected to the power supply circuit of the motor 2 through the operating coil 31 of the relay, and the relay. The normally open contact 34, the movable contact 35, and the electrical circuit of the normally closed solenoid valve 26 connected to the power supply circuit of the motor 2 through the common terminal 32 constitute a circuit that controls the normally closed solenoid valve. The oil mixed with water in the oil tank is introduced into the float chamber and separated into oil and water due to the difference in specific gravity.The oil is filtered and sent back to the oil tank.When the float rises to a certain water level, the water is removed from the outside. An oil-water separation automatic drainage device characterized by automatic drainage.