JPS5914635B2 - Automatic drain discharge device that can release compressed air from the air tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that can be used as an automatic drain discharge device while an air compressor is in operation, and as a device that can discharge compressed air and drain from an air tank simultaneously when the air compressor is not in operation. .

Regarding this, a manual valve is installed in the air tank, and when the air compressor is operating, the manual valve is occasionally opened to discharge the drain, and after the air compressor is not operating, the manual valve is opened and the compressed air and drain are released. However, manual cleaning is up to the person and is often forgotten, and manual cleaning is extremely troublesome for dentists and food-related businesses who place a high value on cleanliness.

Currently used automatic drain discharge devices include those that control a normally closed solenoid valve using a float type and a timer.

In the float type, the drain accumulates above a certain water level and a float floats up to discharge the drain, so there is always a drain below the certain water level.

Types that control a normally closed solenoid valve using a timer cannot discharge the drain generated by cooling the air tank after opening the air compressor's power switch.

In addition, after the air compressor stops operating for both the float type and timer type,
It is impossible to completely eliminate the compressed air in the air tank by releasing it.

The drain remaining in the air tank freezes at night during the cold season,
The pipe burst, blocking the inside of the pipe and disrupting work the next morning.

Furthermore, the compressed air remaining in the air tank causes an overload start-up when the air compressor is started next time, causing burnout of fuses and damage to electrical equipment.

Considering the above points, the present invention aims to provide a device that can automatically discharge the drain in the air tank periodically while the air compressor is in operation, and can discharge the compressed air and the drain after the air compressor has stopped operating. .

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

Reference numeral 1 denotes an electric motor that drives the air compressor 2.

Reference numeral 8 denotes a power switch, which opens and closes the power to the electric motor 1, the normally open solenoid valve 5, and the electric motor 11.

9 is a fuse.

3 is an air tank for storing compressed air.

A normally open solenoid valve 5 for discharging the drain is connected to the bottom of the air tank 3 by a drain discharge pipe 4.

The normally open solenoid valve 5 is open when no current flows through the operating coil 7, and is energized and closed when current flows.

Reference numeral 10 denotes an automatic electric circuit switch, which includes an electric motor 11 that drives a cam 12 and a switch 13.

The switch 13 has an input side terminal 19, an output side terminal 16,
It consists of a push button 15 and a lever 14.

The circuit between the input terminal 19 and the output terminal 16 is always kept closed.

The cam 12 presses the push button 15 when the cam crest contacts the lever 14.
This is what you press.

When push button 15 is pressed, input side terminal 19 and output side terminal 1
6 is opened, and when the cam crest comes out of contact with the lever 14, the push button automatically returns to its old position and the input side terminal 19
The circuit between the terminal 16 and the output terminal 16 is also returned to closed.

The operating coil I of the normally open solenoid valve 5 is connected to the power supply circuit of the motor 1 through the output terminal 16 and input terminal 19 of the switch 13, and the motor 11 is also connected to the power supply circuit of the motor 1.

6 is a pipe through which the normally open solenoid valve 5 discharges the dong to the outside.

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

When the power switch 8 is opened to stop the operation of the air compressor 2 at the end of the day's work, the operating coil 7 of the normally open solenoid valve 5 is turned off.
is deenergized by cutting off the current, and the normally open solenoid valve is kept open, so that the compressed air and drain in the air tank 3 are completely discharged.

Therefore, the motor 1 can be started with no load the next morning, so that no fuse burnout or damage to electrical equipment will occur due to overload during startup.

Also, since there are no drains, accidents caused by frozen drains during the cold season do not occur.

When the power switch 8 is closed to operate the air compressor 2, the circuit between the input terminal 19 and the output terminal 16 is always closed.
Since the circuit is kept closed, the current flows from the input side terminal 19 to the outlet side terminal 16, flows to the operating coil 7, and excites it.
The normally open solenoid valve 8 closes the valve.

From this point on, the normally open solenoid valve 8 is controlled by the automatic circuit switch 10 to discharge the drain.

That is, the electric motor 11 drives the cam 12, the cam 12 rotates, and the cam peak contacts the lever 14 and presses the push button 15, so the circuit between the inlet side terminal 19 and the output side terminal 16 is opened, and the operation is performed. The coil 7 is deenergized by cutting off the excitation current, and the normally open solenoid valve 5 opens to begin drain discharge.

When the cam 12 rotates and the cam peak comes out of contact with the lever 14, the push button 15 returns to its old position, the electric circuit between the inlet terminal 19 and the output terminal 16 is closed, and an exciting current flows through the operating coil 7. The normally open solenoid valve 5 closes and drain discharge stops.

Therefore, the cycle of the normally open solenoid valve 5 is one rotation of the cam 12, and the drain discharge time is the time when the cam peak is pushing the push button 5, and the time when the circuit between the input side terminal 19 and the output side terminal 16 is open. The drain can be discharged repeatedly.

The amount of drain discharged per time is determined by the valve diameter of the normally open solenoid valve and the operating angle of the cam, and the number of drains discharged per unit time is determined by the number of ridges on the cam and the rotation speed of the electric motor.

Therefore, if these values are selected appropriately, drain, which varies in amount depending on the capacity and pressure of the air compressor, will not be left in the air tank, and compressed air will not be unnecessarily released outside. It is also prevented from being released.

- As mentioned above, the automatic drain discharging device of the present invention that can discharge compressed air from an air tank is completely different from conventional automatic drain discharging devices. The compressed air and condensate in the air tank can be completely discharged when the air tank is stopped, so the next startup will be a no-load startup, reducing wear and tear on electrical equipment due to overload startup. This device is very useful as an automatic drain discharge device for metal air compressors because it can be prevented, and since there is no drain even in cold seasons, it can eliminate various accidents caused by frozen drains.

[Brief explanation of drawings]

The drawing is a system diagram of an automatic drain discharge device capable of discharging compressed air in an air tank according to the present invention.

Claims (1)

[Claims] 1 A power supply circuit for the electric motor 1, a normally open solenoid valve 5 connected to the bottom of an air tank 3 to which compressed air is supplied from an air compressor 2 driven by the electric motor 1, a cam 12 driven by the electric motor 11, and a switch. The automatic circuit breaker 10 includes an output terminal 16 and an input terminal 19 of the switch 13.
an electric circuit for the normally open solenoid valve 5 which is connected to the power supply circuit of the motor 1 through the circuit, an electric circuit for the motor 11 connected to the power supply circuit, and a circuit for controlling the normally open solenoid valve 5 by the power supply circuit for the motor 1. When the air compressor is in operation, the cam 12
Each time the circuit between the input side terminal 19 and the output side terminal 16 is opened, the drain is discharged for the time that this circuit is open,
An automatic drain discharge device capable of discharging compressed air in an air tank, characterized in that the compressed air and drain in the air tank are discharged simultaneously when a power switch 8 is opened in order to stop the operation of an air compressor.