JP2517774Y2 - Drain discharge device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for discharging drain accumulated at the bottom of an air tank of an air compressor.

[0002]

2. Description of the Related Art Conventionally, the drain accumulated at the bottom of the air tank of an air compressor is provided with a drain discharge port at the bottom of the air tank, and a pipe is introduced from the drain discharge port to the side of the air compressor to lead the pipe. Generally, a drain trap is provided.

[0003]

In the case of a portable air compressor, the drain trap is located near the floor, which obstructs the movement of the air compressor and hits the drain trap against other objects to damage the drain discharge port. Therefore, if a pressure hose is used for piping, the drain trap is not fixed because it is placed on the floor, so there is no member that will damage the drain trap simply by changing its location, but it will be dragged to the movement, which is preferable. Not that. That is, special care must be taken in handling. Further, in any case, since the drain discharge hole is located in the lower part of the air tank, the area around the drain discharge hole is easily corroded and maintenance management is not easy. Furthermore, since the drain pipe is arranged outside the air tank at the lower part of the air tank and leads to the drain trap, the position of the air tank cannot be lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drain discharge device which can be lowered in position of the air tank without fear of damage to the air tank and drain discharge device and which can be easily handled.

[0005]

The first aspect of the present invention is an air compressor, an air compressor, a motor for driving the air compressor, and an air tank for an air compressor for storing compressed air discharged from the air compressor. In the drain discharge device of the above, the drain pipe approaches the bottom of the air tank, the lower part opens, and the drain pipe penetrates the air tank and communicates to the outside through the valve device at the upper part. is there.

A second aspect of the present invention is an air compressor, a motor for driving the air compressor, and an air compressor for discharging compressed air discharged from the air compressor. , The drain pipe approaches the bottom of the air tank and the lower part opens, penetrates the air tank and communicates to the outside through the valve device at the upper part, and the valve device closes the valve when the motor is energized and energizes the motor. The drain discharge device is provided with a control device for shutting off and opening the valve.

[0007]

[0008]

[0009]

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view. An air compressor 2 and a motor 3 for driving the air compressor 2 are mounted on the air tank 1, and the air compressor 2 and the motor 3 are connected by a belt device 4. The air tank 1 is a closed tank and is provided with wheels 5.
The entire air compressor is portable. The compressed air to be used is taken out from an air outlet (not shown) and used. A drain pipe 6 having a lower end opened into the air tank 1 at a slight distance from the bottom of the air tank 1 penetrates the air tank 1 and goes out to a high place outside the air tank 1, and a drain valve 7 and an electromagnetic valve. The solenoid valve 8 is connected to the valve 8, and the outlet of the solenoid valve 8 is guided to a predetermined processing unit via a pipe, for example, a hose.

The solenoid valve 8 and the motor 3 are interlocked with each other, and are wired in parallel from a power source 9 via a switch (not shown) and a pressure switch 11. In this case, the solenoid valve 8 is an energized closed type. However, when the solenoid valve 8 is opened by energizing, a switch 11 having a B contact is used, and the B contact is wired to the solenoid valve 8. The drain valve 7 preferably has a function of passing the drain but closing the compressed air. The drain drain valve 7 used for this purpose is a manual on-off valve, or a valve that allows air to pass through in a timed manner at the beginning of operation and then acts as a drain trap.

When the motor 3 is energized, the air compressor 2 is operated via the belt device 4. The air compressor 2 sucks in air from the air suction hole 12 and compresses it, and discharges the compressed air to the air tank 1. The air in the air tank 1 is taken out from an air outlet (not shown) for use. The pressure of the air compressed by the air compressor 2 rises. Since the air is cooled from the surroundings in the air tank 1, the saturated steam in the air is condensed and becomes a liquid, and is accumulated at the bottom of the air tank 1. When the air compressor 2 is an oil-lubricated type, oil is mixed in the compressed air in the form of fine particles and mixed in the liquid water as the water is liquefied. This is the so-called drain. In a normal case where the amount of used air is lower than the capacity of the air compressor 2, the compressed air in the air tank 1 is boosted by the operation of the air compressor 2, and the set pressure of a pressure detection unit (not shown) provided in the air tank 1 is set. Then, the switch 11 is turned off. During operation of the air compressor 2, the solenoid valve 8 is energized and closed. When the switch 11 is turned off, the motor 3 and the air compressor 2 are stopped and the solenoid valve 8 is opened.
As a result, the drain drain valve 7 becomes operable, the pressure of the compressed air in the air tank 1 causes the drain to rise in the drain pipe 6, and is discharged through the drain drain valve 7 and the solenoid valve 8. When the compressed air from which the drain has been discharged is sent, the drain release valve 7 shuts off the compressed air to prevent discharge.

The drain drain valve 7 is a manual valve stop valve (including a manually operated solenoid valve), which is closed to prevent the compressed air from being excessively blown out, depending on the state of the discharge drain. Leave the stop valve 7 open,
Keep the internal pressure of the air tank 1 low, and if a drain trap is used, provide a bypass for the pores that pass between the inlet and the outlet of the drain trap so that the air in the drain pipe 6 gradually escapes to increase the drain rising speed. Slow down so that the drain liquid level in the air tank 1 does not become wavy. As a result, when the drain reaches the drain trap, only the drain is discharged and the compressed air is prevented from being discharged. Since the pores of the drain trap are such that the air in the drain pipe 6 is discharged over time, the loss of compressed air is small.

In the embodiment, the air tank 1 has a circular cross section and is uniform in the longitudinal direction like a normal air tank. However, since the lower end of the drain pipe 6 is set at a particularly low place, the air tank 1 is inclined or the drain pipe 6 is A drain reservoir may be provided in a portion facing the lower end of the drain so that the drain can be completely discharged.

Although the solenoid valve 8 is arranged on the downstream side of the drain valve 7 in the embodiment, the solenoid valve 8 may be arranged on the upstream side of the drain valve 7.

FIG. 2 shows another embodiment of the present invention. In the figure, the same parts as those in the previous embodiment are designated by the same reference numerals and the description thereof is omitted. In this embodiment, a timer is provided as a time limiter for limiting the opening / closing time of the solenoid valve. In the figure, when the drain valve 7 is a stop valve, it is always open. The solenoid valve 8 is energized open or energized closed, that is, normally closed or normally open,
A timer 13 is interposed between the switch 11 and the solenoid valve 8. In the case where the timer 13 has a function of constantly connecting the solenoid valve 8 from the power source 9 by connecting the switch 11, the solenoid valve 8 is energized closed, that is, is normally open, and the solenoid valve 8 is operated by disconnecting the switch 11 so that the solenoid valve 8 operates as a timer. The valve is opened for the set time.
In the case where the timer 13 has a function of always disconnecting the power source 9 and the solenoid valve 8 by connecting the switch 11, the solenoid valve 8 is normally closed, and when the switch 11 is turned off, the solenoid valve 8 operates.
The solenoid valve 8 is opened for a set time and the solenoid valve 8 is opened for the set time of the timer 13. In this embodiment, when the solenoid valve 8 is normally closed, the drain valve 7 can be omitted.

In each of the embodiments, it is not necessary to discharge the drain all the time. Therefore, if the drain valve is also used as an air vent valve for venting the compressed air in the air tank 1 at the end of use of the air compressor. In that case, drainage is discharged, so a sluice valve is sufficient for the drainage valve in practical use.

In the embodiment, the drain pipe 6 is a vertical straight pipe, but the lower end of the drain pipe 6 may be close to the bottom of the air tank 1, and the drain pipe 6 may be bent or slanted. You may arrange.

As described above, in each embodiment, the pressure switch provided in the air tank detects the upper limit pressure of the air tank to stop the operation of the air compressor, and detects the lower limit pressure to start the operation of the air compressor. In the air compressor provided with the control device of No. 3, the control by the pressure switch (the contact is 11) is described. In addition to the above-mentioned pressure switch, the air compressor is usually provided with a switch that connects the air compressor and the power supply on the power supply side of the pressure switch 11. Next, FIG. 3 shows an embodiment in which the switch is controlled.

The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Electric power is supplied from an electric power source 9 via a switch 15 to an air compressor indicated by reference numeral 14, and intermittent operation control is performed by a pressure switch 11. The power receiving side of the switch 9 is connected to the solenoid valve 8. The solenoid valve 8 is energized and closed. When the switch 15 is closed, the solenoid valve 8 is closed, and when the switch 15 is turned off, the solenoid valve 8 is opened. Therefore, when the switch 15 is turned on at the start of work, the solenoid valve 8 is closed. Further, since the solenoid valve 8 is opened when the switch 15 is closed at the end of work, the compressed air in the air tank 1 is released at the end of work, and the drain of the air tank 1 is discharged at the same time. By doing so, it is possible to sufficiently cope with drain discharge of a small compressor. In the above embodiment, the solenoid valve 8 may be opened by closing the switch 15, and the solenoid valve 8 may be closed by opening the switch 15. The control device for the solenoid valve 8 is not limited to the embodiment. The solenoid valve 8 may be a normally closed solenoid valve using the B contact of the switch 15. Also, the solenoid valve 8
It is not always necessary to open the switch 15 at the end of the work until it is closed the next day until the switch 15 is closed, and during that time, the valve 15 is opened for the required time by the time delay means. You can leave it alone.

[0021]

[Effect of the Invention] The present invention guides the drain pipe to a high place by bringing the lower end of the drain pipe close to the bottom of the air tank, and draining the drain pipe to a high place.
Since it is equipped with a valve device , there is no risk of damaging the air tank and drain discharge device as when draining the drain from the bottom of the air tank to the outside immediately, maintenance and inspection of the drain discharge device is easy, and manual operation is possible. Even in the case, it is easy to handle because it is equipped with a drain valve device at a high place. Lowering the position of the air tank
Can be. Further, since the valve device is closed at the same time as the motor is energized, the drain is not discharged during the operation of the air compressor, and there is no fear that the drain will be discharged when the pressurization is required.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of still another embodiment of the present invention.

[Explanation of symbols]

 1 Air tank 6 Drain pipe 7 Drain drain valve 8 Solenoid valve 11 Switch 13 Timer 15 Switch

Claims (2)

(57) [Scope of utility model registration request] 1. A drain discharge device for an air compressor of an air compressor, comprising: an air compressor; a motor for driving the air compressor; and an air tank for storing compressed air discharged from the air compressor. The drain discharge device is characterized in that the lower part is opened close to the bottom part, the lower part opens through the air tank, and the upper part communicates with the outside through a valve device. 2. A drain discharge device for an air compressor of an air compressor, comprising: an air compressor; a motor for driving the air compressor; and an air tank for storing compressed air discharged from the air compressor. The lower part opens close to the bottom part of the valve , penetrates the air tank, and communicates to the outside through the valve device at the upper part.The valve device closes the valve when the motor is energized and shuts off the current to the motor and opens the valve. A drain discharge device, which is provided with a control device that operates.