JPH09303265A - Drying method for compressed air and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an interval between an air tank and a hollow filament film type air drier to be interrupted when stored compressed air is not used by installing this hollow filament film type air drier in space between an air intake and the air tank of an air compressor. SOLUTION: This drier is so constituted that it operates an air compressor, producing compressed air, by the working of a pressure switch 15 when compressed air pressure in an air tank 2 constituting this air compressor 1, and the compressed air is made so as to pass through a hollow filament film type air driver 50. In this case, this air drier 50 is installed in space between an air intake 9 and the air tank 2 of this air compressor 1, and when the compressed air sufficiently stored in the air tank 2 is not used, an interval between the air tank 2 and the air driver 50 is made into a state of being interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drying compressed air and a drying device, which aims to minimize the operation of the air compression device after turning on the main power switch. Is.

[0002]

2. Description of the Related Art As a conventional method and apparatus for drying compressed air, there is a configuration shown in FIG. Conventionally, generally, the air compression device 1 is commercially available, and by turning on the switch 13 of the power supply 12, the air tank 2, the air compressor 3, the motor 4, the air compressor 3, and the motor 4 are turned on. The air compressor 1 composed of the belt device 6 for transmitting the movement of the air and the pressure switch 15 connected to the air tank 2 is actuated to suck the air from the air intake 9 to produce the compressed air. Was stored in the air tank 2.

On the other hand, when the pressure in the air tank 2 rises and exceeds a certain pressure, the pressure switch 15 is turned off to stop the operation of the air compressor 1. Next, when the compressed air in the air tank 2 flows out while the operation of the air compression device 1 is stopped, that is, various pneumatic machines connected to the compressed air outlet 5 are operated and the compressed air is used. When the pressure in the air tank 2 decreases due to this, the pressure switch 15 is turned on to operate the air compression device 1,
Air was sucked from the air intake 9 to create compressed air in the air tank 2.

In this case, when the compressed air stored in the air tank 2 is to be used for operating various pneumatic machines, the compressed air is discharged from the compressed air outlet 5 through the dehumidifier 30 and the air filter 35. And hollow fiber membrane air dryer 5
No. 0, and the compressed air was dried by the action of the hollow fiber membrane type air dryer 50, and then the compressed air was sent to a pneumatic machine that requires it.

The dehumidifier 30 is provided in addition to the hollow fiber membrane type air dryer 50 in order to enhance the dehumidifying effect, and is an air-cooling type that allows compressed air to pass through the inside of a spirally processed steel pipe. Are using. Further, the air filter 35 is provided to prevent the hollow fiber membrane type air dryer 50 from being replaced early due to clogging with dust.

Here, the hollow fiber membrane type air dryer 50 is used.
The outer side is constituted by a body 51 and a protective case 52, and the body 51 is provided with an inlet 51a into which moist compressed air enters and an outlet 51b from which dry compressed air is discharged. On the other hand, inside the hollow fiber membrane type air dryer 50, two sets of filter cases 54 accommodating the hollow fiber membranes 53 are arranged, and one end of one set of the hollow fiber membranes 53 has an inlet 51a of the body 51. The other end of the hollow fiber membrane 53 is connected to the outlet 51b of the body 51.

The seal end face 59 on the inner side of the end of the filter case 54 is formed by a sealing material between the outer side of the end of the hollow fiber membrane 53 and the inner side of the end of the filter case 54.
Compressed air entering from the inlet 51a of the body 51 is introduced into the inside of the hollow fiber membrane 53.

Therefore, the two sets of filter cases 54
An O-ring 57 is provided between the outside of the end of the above and the inside of the body 51 in order to prevent the introduced compressed air from leaking to the outside. The O-ring 57 is arranged for the same purpose between the other end of the filter case 54 and the inside of a filter support 55, which will be described later.

Of these two sets of filter cases 54,
A filter support 55 is provided at an end of the body 51 opposite to the inlet 51a and the outlet 51b. The filter support 55 includes two sets of filter cases 54.
It is divided by a sealing end surface 59 at the end of the compressed air chamber 56 and the purge air passage 58 to form two parts.

Here, the compressed air introduced into the inside of one hollow fiber membrane 53 from the inlet 51a of the body 51 passes through the inside of the other hollow fiber membrane 53 via this compressed air chamber 56. The outlet 51b of the body 51 is discharged. On the other hand, the purge air passage 58 communicates with the inside of the two sets of filter cases 54 and the outside of the hollow fiber membrane 53.

As described above, the two sets of the filter case 54 and the filter support 55, which house the hollow fiber membranes 53, have a portion inside the hollow fiber membranes 53 that allows compressed air to flow from the inlet 51a to the outlet 51b of the body 51. The hollow fiber membrane 53 inside the filter case 54 is divided into outer portions. On the other hand, when the compressed air is passed through the hollow fiber membrane 53, only the water vapor is discharged to the outside of the hollow fiber membrane 53 through the holes of the hollow fiber membrane 53, and the compressed air that has passed through the inside of the hollow fiber membrane 53 is discharged. When it reaches the outlet 51b of the body 51, it becomes dry compressed air.

Therefore, in order to discharge the water vapor, which has been discharged and stayed outside the hollow fiber membrane 53 through the hole of the hollow fiber membrane 53, to the outside of the hollow fiber membrane air dryer 50, the body 5
1 of the compressed dry air that has reached the outlet 51b side (about 1
0%) from the outlet 51b side of the body 51 toward the inlet 51a side, and outside the hollow fiber membrane 53, the filter case 54
Has been introduced to the inner part of.

The dry compressed air introduced from the outlet 51b side of the body 51 is used as purge air together with the water vapor remaining outside the hollow fiber membrane 53, and the inlet 51 of the body 51.
It is discharged from the a side to the outside of the filter case 54, and is discharged to the outside of the hollow fiber membrane type air dryer 50 through the outside of the filter case 54 and the inside of the protective case 52.

[0014]

However, when such a conventional compressed air drying method and drying apparatus are used, the hollow fiber membrane type air dryer 5 is used as the drying apparatus.
When 0 is used, the effect of using the hollow fiber membrane type air dryer 50 such as that the drying device does not require a power source, is small and lightweight, and so on can be utilized.

On the other hand, since the hollow fiber membrane type air dryer 50 is disposed directly on the downstream side of the air tank 2, the compressed air from the air tank 2 is always supplied to the hollow fiber membrane type air dryer 50. Since a part (about 10%) of the compressed air is constantly discharged as purge air to the outside when passing through the hollow fiber membrane type air dryer 50, the power source 12
Even if you are not using a pneumatic machine unless you disconnect
The air compressor 1 has a problem that it continues to operate intermittently.

In particular, the conventional air compressor 1 has an air tank 2, an air compressor 3, a motor 4, a belt device 6 for transmitting the action of the motor 4 to the air compressor 3, and a pressure connected to the air tank 2. It consists of a switch 15 and
This arrangement is common because the idea that compressed air is generated by the air compression device 1 and the compressed air stored in the air tank 2 is dried if necessary is common. An object of the present invention is to solve such a problem.

[0017]

According to the present invention, when the compressed air pressure in the air tank 2 constituting the air compression device 1 becomes a certain pressure or less, the pressure switch 15 works to operate the air compression device 1. In a method of drying compressed air which is operated to generate compressed air and which is dried by passing through the hollow fiber membrane type air dryer 50, the air intake 9 of the air compressor 1 and the air tank 2 are In between, the hollow fiber membrane type air dryer 5
0 is provided, and when the compressed air sufficiently stored in the air tank 2 is not used, the air tank 2 and the hollow fiber membrane type air dryer 50 are cut off from each other. To solve.

Further, when the compressed air pressure in the air tank 2 which constitutes the air compression device 1 becomes lower than a certain pressure, the pressure switch 15 works so that the air compression device 1 can be operated.
Is operated to generate compressed air, and the compressed air is dried by passing through the hollow fiber membrane type air dryer 50. In the compressed air drying device, the air intake port 9 of the air compression device 1 and the air tank 2 are By disposing the hollow fiber membrane type air dryer 50 and the check valve 70 for preventing the compressed air in the air tank 2 from flowing back to the hollow fiber membrane type air dryer 50 side, the above problems are solved. Solve.

Further, when the compressed air pressure in the air tank 2 constituting the air compression device 1 falls below a certain pressure, the pressure switch 15 works to operate the air compression device 1 to produce compressed air, A compressed air drying device for drying the compressed air by passing through the hollow fiber membrane type air dryer 50, wherein the air compression device 1
The hollow fiber membrane type air dryer 50 and the solenoid valve 90 are arranged between the air intake 9 of the above and the air tank 2.
By interlocking the operation of the pressure switch 15 and the solenoid valve 90, the above problems are solved.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A method and apparatus for drying compressed air according to the present invention will be described in detail with reference to the drawings. However, the description of the same contents as the conventional technique is omitted. FIG. 1 is a configuration diagram of a compressed air drying device according to the present invention, and FIG. 2 is a part of another configuration diagram of a compressed air drying device according to the present invention.

As is apparent from this figure, in FIG. 1, reference numeral 1 is an air compressor, which is composed of an air compressor 3, a motor 4 and an air tank 2. It is transmitted by the device 6. The motor 4 which is the power source of the air compression device 1
Operates by turning on the switch 13 of the power supply 12.

In addition, the air tank 2 has a pressure switch 15
When the pressure in the air tank 2 rises and exceeds a certain pressure, the pressure switch 15 is turned off to stop the operation of the air compressor 1.
When the pressure in the air tank 2 drops below a certain level, the pressure switch 15 is turned on to operate the air compressor 1.

The air compressor 1 is provided with an air inlet 9, and the air sucked from the air inlet 9 becomes compressed air, and the dehumidifier 30, the air filter 35, the hollow fiber membrane type air dryer. The dry compressed air is stored in the air tank 2 via 50 and the backflow preventing means 70 and 90.

In this case, the backflow preventing means 70, 90 are provided to prevent the compressed air sufficiently stored in the air tank 2 from being used by various pneumatic machines connected to the compressed air outlet 5. The tank 2 and the hollow fiber membrane type air dryer 50 are cut off from each other. The compressed air that has been dried is stored in the air tank 2, but when the drain 10 accumulates in the air tank 2, the drain vent hole 7
The drain 10 inside is discharged by a more manual cock.

The method and apparatus for drying compressed air according to the present invention is constructed as described above.
The operation will be described.

When the air compressor 1 is operated by turning on the switch 13 connected to the power source 12 and transmitting the motion of the motor 4 by the belt device 6, the air intake 9
Breathe in more air and create compressed air. The compressed air is introduced into the inlet 51a of the body 51 of the hollow fiber membrane type air dryer 50 via the dehumidifier 30 and the air filter 35.

In the hollow fiber membrane type air dryer 50, when moist compressed air is introduced into the inside of the hollow fiber membrane 53 by the function of the built-in hollow fiber membrane 53, only the water vapor is supplied from the very fine holes to the hollow fiber membrane 53. The compressed air that is dried is obtained when the compressed air is discharged to the outside of the body 51 and reaches the outlet 51b side of the body 51.

On the other hand, the water vapor discharged to the outside of the hollow fiber membrane 53 through the hole of the hollow fiber membrane 53 and accumulated therein is discharged to the outside of the hollow fiber membrane type air dryer 50, so that the body 51 is discharged.
Part of the dry compressed air that has reached the outlet 51b side of the
%) Is introduced into the inner portion of the filter case 54 outside the hollow fiber membrane 53 from the outlet 51b side of the body 51 toward the inlet 51a side.

The compressed air introduced from the outlet 51b side of the body 51 is discharged from the inlet 51a side of the body 51 to the outside of the filter case 54 together with the water vapor remaining outside the hollow fiber membrane 53, and the filter case It is discharged to the outside of the hollow fiber membrane type air dryer 50 through the outside of 54 and the inside of the protective case 52.

The compressed air that has passed through the hollow fiber membrane type air dryer 50 and dried is stored in the air tank 2 via the backflow preventing means 70 and 90. In this case, when the air compression device 1 is operating, even if the backflow preventing means 70 and 90 are present, the compressed air flows from the hollow fiber membrane type air dryer 50 to the air tank 2, but the air compression device 1 operates. When not, the compressed air is kept blocked by the action of the backflow preventing means 70 and 90 so that the compressed air does not backflow from the air tank 2 to the hollow fiber membrane air dryer 50.

The compressed air stored in the air tank 2 is
As long as various pneumatic machines are operated at the tip of the compressed air outlet 5, a constant pressure is maintained and the air compression device 1 is also in operation. On the other hand, when the operation of the pneumatic machine is stopped, the pressure in the air tank 2 rises. When the pressure in the air tank 2 rises and exceeds a certain pressure, the pressure switch 15 is turned off and the air compression device 1 stops operating. Furthermore, when various pneumatic machines are operated at the tip of the compressed air outlet 5 with the air compressor 1 stopped operating, the pressure in the air tank 2 decreases. When the pressure drops, the pressure switch 15 is turned on to operate the air compression device 1.

[0032]

EXAMPLES The present invention will be described in more detail below with reference to examples.

(Embodiment 1) FIG. 1 is a block diagram of a compressed air drying apparatus according to the present invention, and 70 is a check valve.
This check valve 70 is provided for the dry compressed air in the air tank 2
However, the compressed air stored in the air tank 2 does not flow back to the hollow fiber membrane type air dryer 50. Accordingly, the pressure of the compressed air stored in the air tank 2 does not decrease unless the pneumatic machine is used at the tip of the compressed air outlet 5. That is, the air compression device 1 does not operate.

(Embodiment 2) FIG. 2 is a part of another constitutional view of a compressed air drying apparatus according to the present invention, and 90 is a solenoid valve. The solenoid valve 90 is in communication when the pressure switch 15 connected to the air tank 2 is on, and is closed when the pressure switch 15 is off.
Therefore, the pressure of the compressed air stored in the air tank 2 does not drop unless the pneumatic equipment is used at the tip of the compressed air outlet 5. That is, the air compression device 1
Does not work.

[0035]

As is clear from the above description, according to the present invention, the following effects can be obtained. 1. No power source is required for the dryer, it is small and lightweight,
・ ・ The effect of using hollow fiber membrane type air dryer can be used as it is. 2. If the compressed air is sufficiently stored in the air tank, the air compression device will not operate unless pneumatic equipment is used at the tip of the compressed air outlet. Therefore, it is useful for energy saving. 3. It can be easily added to a commercially available air compressor.

[Brief description of drawings]

FIG. 1 is a block diagram of a compressed air drying apparatus according to the present invention.

FIG. 2 is a part of another block diagram of the compressed air drying apparatus according to the present invention.

FIG. 3 is a block diagram of a conventional compressed air drying device.

[Explanation of symbols]

 1-Air compressor 2-Air tank 3-Air compressor 4-Motor 5-Compressed air outlet 6-・ ・ ・ ・ ・ Belt device 7 ・ ・ ・ ・ ・ ・ Drain drain hole 9 ・ ・ ・ ・ ・ ・ Air intake 10 ・ ・ ・ Drain 12 ・ ・ ・ Power supply 13 ・ ・ ・ Switch 15 ・・ ・ ・ Pressure switch 30 ・ ・ ・ Dehumidifier 35 ・ ・ ・ ・ ・ Air filter 50 ・ ・ ・ ・ ・ Hollow fiber membrane type air dryer 51 ・ ・ ・ Body 51a ・ ・ ・ Inlet 51b ・ ・..Outlet 52..Protection case 53..hollow fiber membrane 54..filter case 55..filter support 56..compressed air chamber 57 ..・ O-ring 58 ・ ・ ・ Purge air passage 59 ・ ・ ・ ・ ・ Seal end face 70 ・ ・ ・ Reverse The valve (backflow preventing means) 90 ..... solenoid valve (backflow preventing means)

Claims (3)

[Claims] 1. When the compressed air pressure in an air tank (2) constituting the air compression device (1) falls below a certain pressure, the pressure switch (15) acts to operate the air compression device (1). A method for drying compressed air, which is operated to generate compressed air, and the compressed air is dried by passing through a hollow fiber membrane type air dryer (50), wherein an air inlet (9) of the air compressor (1) is used. The hollow fiber membrane type air dryer (50) is disposed between the air tank (2) and the air tank (2) when the compressed air sufficiently stored in the air tank (2) is not used. A method for drying compressed air, characterized in that a space between the hollow fiber membrane type air dryer (50) and the hollow fiber membrane type air dryer (50) is cut off. 2. When the compressed air pressure in the air tank (2) constituting the air compression device (1) falls below a certain pressure, the pressure switch (15) causes the air compression device (1) to operate. A dryer for compressed air, which is operated to generate compressed air and which is dried by passing through the hollow fiber membrane type air dryer (50), wherein an air intake (9) of the air compressor (1) is used. Between the air tank (2), the hollow fiber membrane type air dryer (50) and a non-return valve for preventing compressed air in the air tank (2) from flowing back to the hollow fiber membrane type air dryer (50) side. A device for drying compressed air, which is provided with a valve (70). 3. When the compressed air pressure in the air tank (2) constituting the air compression device (1) falls below a certain pressure, the pressure switch (15) acts to operate the air compression device (1). A dryer for compressed air, which is operated to generate compressed air and which is dried by passing through the hollow fiber membrane type air dryer (50), wherein an air intake (9) of the air compressor (1) is used. The hollow fiber membrane type air dryer (50) and the solenoid valve (90) are arranged between the air tank (2) and the pressure switch (15) and the solenoid valve (90) are operated in conjunction with each other. A compressed air drying device characterized in that