JP2602163B2 - Multi-stage reciprocating air compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a condensed oil (hereinafter referred to as "condensed oil") in pressurized air discharged from each cylinder at the start of operation.
It is called drain. The present invention relates to a multi-stage reciprocating air compressor provided with a drain discharge device capable of operating a drain discharge piston valve for discharging water from a water separator, and, at the start of operation, operating an unloader valve device of each cylinder. The present invention relates to a multi-stage reciprocating air compressor provided with a possible no-load operation device.

[0002]

2. Description of the Related Art In a conventional multi-stage reciprocating air compressor, the drain in the pressurized air discharged from each stage cylinder enters a water separator through a cooler of each stage cylinder, and is opened and closed by the pressurized air. The water was discharged from the water separator via the drain discharge piston valve of each cylinder. The no-load operation at the start of the operation was performed via an unloader valve device of each cylinder which was opened and closed by pressurized air. When a high-pressure air reservoir of high-pressure air discharged from the last-stage cylinder of the compressor is used as a pressure air source of the drain discharge piston valve and the unloader valve device without passing through a pressure reducing valve, the drain discharge is performed. The piston valve and the unloader valve device are disadvantageous in that the cost is high and strict safety management for high-pressure air must be performed.

When the pressure air source for the drain discharge piston valve and the unloader valve device is obtained from the air depressurized to a constant pressure through the pressure reducing valve from the discharge pipe of the last stage cylinder, the following disadvantage occurs. . That is, when the high-pressure air discharged from the compressor is not stored in the high-pressure air reservoir at the start of operation, unless the pressure air is supplied from a separately provided small-sized air compressor, the high-pressure air is discharged to the final-stage cylinder. Although it depends on the pressure, it takes several minutes for the discharge air to reach the predetermined pressure, during which time there is a drawback that the drain of each cylinder cannot be discharged and no-load operation cannot be performed.

[0004]

SUMMARY OF THE INVENTION The present invention enables a pressure air source necessary for opening / closing control of a drain discharge piston valve at the start of operation to be constantly stored in the tank and discharges drain by low pressure air. The present invention provides a multi-stage reciprocating air compressor having a drain discharge device capable of constantly operating a piston valve.

Further, the present invention enables a source of compressed air necessary for operation of the unloader valve device at the start of operation to be always stored therein, and enables the unloader valve device to be always operated by low-pressure air. The present invention provides a multi-stage reciprocating air compressor provided with the no-load operation device described above.

[0006]

In order to achieve the above object, a multistage reciprocating air compressor according to the present invention, as shown in the drawing, has a water separator 111 for each of the cylinders 11, 12, 13 at the start of operation. , 121, 131, the discharge pressure air of the first-stage cylinder 11 is
And a control receiver tank 22 for receiving a part of the discharge pressure air passing through the cooler 111 and the water separator 112 when sucking the water into the two-stage cylinder 12 through the water separator 112. Drain discharge piston valve 4 for each stage cylinder 11, 12, 13
One, three-way solenoid valve 31 is provided between 1, 42, and 43 so that the mouth 310 can be opened or closed to the atmosphere.
One end 310 of the three-way solenoid valve 31 is opened and closed, and the drain discharge device 40 configured to control opening and closing of the drain discharge piston valves 41, 42, and 43 by the pressurized air received in the control receiver tank 22. It is provided.

In the multi-stage reciprocating air compressor of the present invention, it is preferable that the three-way solenoid valve 31 of the drain discharge device 40 be operated at regular intervals.

[0008] The multi-stage reciprocating air compressor of the present invention comprises:
At the start of operation, the unloader valve devices 51, 52, and 53 of the cylinders 11, 12, and 13 are operated to operate without load.
And a control receiver tank 22 for receiving a part of the discharge pressure air passing through the cooler 111 and the water separator 112 when sucking the air into the two-stage cylinder 12 through the water receiver 11 and the water separator 112. And the unloader valve device 51 of each cylinder 11, 12, 13
A three-way solenoid valve 33 was provided between 52 and 53 so that the mouth 330 could be opened or closed to the atmosphere, and the mouth 330 of the three-way solenoid valve 33 was opened and closed and received in the receiver tank 22. The apparatus includes a no-load operation device 50 configured to control opening and closing of the unloader valve devices 51, 52, and 53 by compressed air.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 10 denotes a multi-stage reciprocating air compressor, 11 denotes a one-stage cylinder, 12 denotes a two-stage cylinder, and 13 denotes a three-stage cylinder. Reference numeral 110 denotes a suction pipe. 111 and 112
Are the cooler and water separator of the first-stage cylinder 11, 121 and 122 are the cooler and water separator of the second-stage cylinder 12,
131 and 132 show a cooler and a water separator of the three-stage cylinder 13. The discharge pressure air of the first-stage cylinder 11 passes through a cooler 111 and a water separator 112,
Is discharged to the third-stage cylinder through the cooler 121 and the water separator 122, and the discharge pressure air of the third-stage cylinder 13 is discharged to the cooler 13
After passing through the water separator 1 and the water separator 132, the air enters the high-pressure air reservoir 135 via the check valve 133 and the stop valve 134.

Reference numeral 22 denotes a control receiver tank. A part of the discharge pressure air passing through the cooler 111 and the water separator 112 of the first-stage cylinder 11 is transferred from the water separator 112 to the check valve 21.
Via the control receiver tank 22.

The drain discharge device 40 includes a cylinder 1 for each stage.
1, 12, 13 drain discharge piston valves 41, 42,
In addition to 43, a three-way solenoid valve 31 for automatic operation, a three-way valve 32 for manual operation, and a two-way solenoid valve 411 are provided. The three-way solenoid valve 31 and the three-way valve 32 are provided between the control receiver tank 22 and the drain discharge piston valves 41, 42, 43 of the cylinders 11, 12, 13. As a result, the drain valves 41, 4
2, 43 can be operated by the three-way valve 31 for automatic operation or the three-way valve 32 for manual operation.

Drain discharge piston valves 41, 42, 43
Are of the type conventionally used and are usually of the type that is opened by the force of a spring. Three-way solenoid valve 31
1 can open or close the mouth 310 shown in FIG. 1 to the atmosphere. The mouth 310 is closed by energization, and the mouth 310 is opened by de-energization. When the mouth 310 is closed, the pressurized air in the control receiver tank 22 reaches the drain discharge piston valves 41, 42, 43, closes the drain discharge piston valves 41, 42, 43, and
When the mouth 310 is opened to the atmosphere, the compressed air in the pipes reaching the drain discharge piston valves 41, 42, 43 becomes the mouth 3.
10 is discharged to the atmosphere and the drain valve 4
1, 42 and 43 are opened. The three-way opening solenoid valve 31 can be repeatedly opened and closed at regular intervals by a timer (not shown). The two-way solenoid valve 411 is connected to the water separator 11 of the first cylinder 11.
2 and provided between the drain discharge piston valve 41,
It closes when energized and opens after a few seconds. When there is no pressurized air in the control receiver tank 22,
It is closed and closed for several seconds when the compressor 10 is energized at the time of starting. During this time, the drain valve 41 of the first-stage cylinder 11 is closed in place of the first-stage
Is stored in the control receiver tank 22.

When the three-way valve 32 for manual operation is operated so as to close the mouth 320 connected to the three-way solenoid valve 31 for automatic operation, the pressurized air in the control receiver tank 22 releases the piston valve for drain discharge. Reaching 41, 42, 43, closing the drain discharge piston valves 41, 42, 43,
Further, when the mouth 320 is operated to open, the pressure air in the pipes reaching the drain discharge piston valves 41, 42, 43 is released from the mouth 310 of the three-way solenoid valve 31 to the atmosphere, and the drain air is discharged. The piston valves 41, 42 and 43 are opened.

The no-load operation device 50 includes a cylinder 1 for each stage.
In addition to the unloader valve devices 51, 52, 53 of 1, 12, and 13, a three-way solenoid valve 33 for automatic operation and a three-way valve 34 for manual operation are provided. Three-way solenoid valve 33 and three-way valve 3
4 is the control receiver tank 22 and each stage cylinder 11,
It is provided between the unloader valve devices 51, 52, 53 of 12, 13. Thereby, the unloader valve device 5
1, 52 and 53 can be operated by a three-way solenoid valve 33 for automatic operation or a three-way valve 34 for manual operation.

The unloader valve devices 51, 52 and 53 are conventionally used and are usually of a type which is closed by the force of a spring. The three-way solenoid valve 33 for automatic operation can close the mouth 330 shown in FIG. 1 or open it to the atmosphere. The mouth 330 is closed when energized, and the mouth 330 is opened when not energized. I have. When the mouth 330 is closed, the pressurized air in the control receiver tank 22 reaches the unloader valve devices 51, 52, 53, opens the unloader valve devices 51, 52, 53, and
When the mouth 330 is opened to the atmosphere through the mouth 340 of the three-way valve 34 for manual operation, the unloader valve devices 51, 5
The pressurized air in the pipes reaching to 2, 53 is released to the atmosphere through the port 340, and the unloader valve devices 51, 52,
53 is closed.

The three-way valve 34 for manual operation is provided when the three-way solenoid valve 33 for automatic operation is shut off.
When operated to close the control valve 40, the pressure air in the control receiver tank 22 releases the unloader valve devices 51, 52, 53.
, The unloader valve devices 51, 52, 53 are opened, and when the mouth 340 is operated to be opened,
The pressurized air in the pipes leading to the unloader valve devices 51, 52, 53 is released to the atmosphere, and the unloader valve devices 51, 5
2, 53 are closed.

Reference numerals 611, 612, 613, and 614 denote normally closed stop valves provided in the drain pipe.
Reference numerals 21, 622, and 623 denote normally open stop valves provided in the drain pipe.

[0018]

When the multi-stage reciprocating air compressor 10 is started, the discharge pressure air from the first-stage cylinder 11 is supplied to the cooler 11
1 and a part of the discharge pressure air which has been sucked into the second cylinder 12 through the water separator 112 and passed through the cooler 111 and the water separator 112, is immediately received by the control receiver tank 22, where Work to be stored.
The three-way solenoid valve 31 is controlled to open and close the mouth 310, and operates to open and close the drain discharge piston valves 41, 42, 43 by the pressurized air received in the control receiver tank 22. Further, the three-way solenoid valve 31 is operated at regular intervals, whereby the drain discharge piston valves 41, 42, 43 are opened and closed, and the cylinders 11, 1 and 1 of each stage are opened and closed.
Drains 2 and 13 work so as to be intermittently discharged. The three-way opening solenoid valve 33 is controlled to open and close the opening 330, and opens and closes the unloader valve devices 51, 52, 53 by the pressurized air received in the control receiver tank 22, and controls the cylinders 11, 12, 13 of each stage. Work so that no-load operation is possible.

[0019]

As described above, the multi-stage reciprocating air compressor according to the present invention can be started even if there is no high-pressure air in the discharge high-pressure air reservoir 135, or if there is no separate starting air compressor. Immediately, a part of the discharge pressure air of the first-stage cylinder 11 can be stored in the control receiver tank 22, whereby the drain discharge piston valves 41, 42, 43 of the drain discharge device 40 are immediately controlled. And drain can be discharged. Further, since the drain discharge device 40 is operated by low-pressure compressed air, the drain discharge device can be manufactured at low cost. Further, the multi-stage reciprocating air compressor of the present invention, even when there is no high-pressure air in the discharge high-pressure air reservoir 135 or does not have another small air compressor, immediately starts discharging the first-stage cylinder 11 A portion of the pressurized air can be stored in the control receiver tank 22, whereby immediately each of the cylinders 11, 12,.
By controlling the thirteen unloader valve devices 51, 52, 53,
No-load operation can be started. Moreover, since the no-load operation device 50 can be operated by low-pressure compressed air, the no-load operation device 50 can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the outline of the apparatus of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 10 Multistage reciprocating air compressor 11 1st cylinder 12 2nd cylinder 13 3rd cylinder 111, 121, 131 Cooler 112, 122, 132 Water separator 22 Control receiver tank 31 Three-way solenoid valve 310 One-way solenoid valve Three-way solenoid valve 330 Single mouth 40 Drain discharge device 41, 42, 43 Drain discharge piston valve 50 No-load operation device 51, 52, 53 Unloader valve device

Claims (3)

(57) [Claims] 1. A method for discharging drain from a water separator of each stage cylinder at the start of operation, wherein the discharge pressure air of the first stage cylinder is sucked into a second stage cylinder through a cooler and a water separator. And a control receiver tank configured to receive a part of the discharge pressure air that has passed through the water separator, and between the control receiver tank and the drain valve piston valve of each stage cylinder, one port is opened to the atmosphere or A three-way solenoid valve that can be closed is provided, and one of the three-way solenoid valves is opened and closed to open and close the drain discharge piston valve by pressurized air received in the control receiver tank. A multi-stage reciprocating air compressor comprising a drain discharge device configured to be controllable. 2. The multi-stage reciprocating air compressor according to claim 1, wherein the three-way solenoid valve of the drain discharge device operates at regular intervals. 3. When starting operation, the unloader valve device of each cylinder is operated to operate without load, so that the discharge pressure air of the first cylinder is sucked into the second cylinder through the cooler and the water separator. Providing a control receiver tank adapted to receive a part of the discharge pressure air passing through the cooler and the water separator, and between the control receiver tank and the unloader valve device of each stage cylinder, one port is open to the atmosphere. A three-way solenoid valve that can be opened or closed is provided, and one opening of the three-way solenoid valve is opened and closed, and the unloader valve device is opened and closed by the pressurized air received in the control receiver tank. A multi-stage reciprocating air compressor comprising a no-load operation device configured to be controllable.