JPH10277351A - Compressed air dehumidifying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized compressed air dehumidifying system. SOLUTION: A compressed air dehumidifying system 1 has an adsorption cylinder 2 which is pipe arranged on the secondary side 12 through a check valve 5, a separation membrane type dehumidifier 3 equipped with hollow fibers which is formed from a polymer material which removes water vapor in air, and a direction controlling valve 4 which is pipe-arranged between the primary side 3 of the cylinder 2 and the dehumidifier 3 and a compressed air supply source 7. During dehumidification for supplying dry compressed air to the secondary side, the valve 4 makes the source 7 communicate with the cylinder 2, and during the regeneration of an adsorbent, the valve 4 makes the source 7 communicate with the dehumidifier 3 to release the primary side of the cylinder 2 to the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air dehumidification system for drying and supplying compressed air, and more particularly to a compressed air dehumidification system for regenerating an adsorbent having absorbed moisture by intermittent operation.

[0002]

2. Description of the Related Art In a drive device or the like operated by compressed air, water in the compressed air is removed to solve problems such as malfunction of the device, corrosion or freezing caused by the compressed air containing moisture. A compressed air dehumidification system for removal is employed. One such conventional example is disclosed in Japanese Patent Publication No. 43-12880.
This conventional example was developed in view of the necessity of replacing the adsorbent itself when the adsorbent absorbing moisture in the compressed air was saturated, and the drying function was interrupted. The regeneration of the adsorbent is performed automatically when it is performed.

[0003] More specifically, Fig. 13 shows a compressed air dehumidification system for supplying compressed air to a vehicle air braking device. Compressor 101
Is suitably connected to the engine 102 and is driven by the engine when the engine is running. In general, the air compressed by the compressor 101 passes through the conduit 103, passes through the inlet 105 of the drying cylinder 104, passes through the drying cylinder 104 and the outlet 106, and passes through the conduit 107 from the check valve 110. Then, the compressed air passing through the pipe 107 is sent to and stored in the storage tank 108, and the compressed air is supplied by the valve device 109 as needed to operate the compression braking device of the vehicle. On the other hand, when the adsorbent in the drying cylinder 104 is to be regenerated without using the compressed air, the dried compressed air in the storage tank 108 is caused to flow back to the pipe 107, passed through the passage 111, The compressed air is depressurized and flows into the drying cylinder 104. Then, after the moisture in the drying cylinder 104 is removed to regenerate the adsorbent, the air containing the moisture is discharged to the atmosphere.

[0004]

However, in such a conventional compressed air dehumidification system, the storage tank 10
The dry compressed air stored in the storage tank 108 is used not only for operating the compression braking device of the vehicle but also for regenerating the adsorbent of the drying cylinder 104.
It is necessary to store dry compressed air sufficiently inside. Therefore, the compressed air had to be stored in a considerable amount, and the volume of the storage tank 108 had to be increased. Therefore, there is a disadvantage that the system itself becomes large. However, in addition to the vehicle air braking device described above, pneumatic circuits tend to be integrated, and in view of the limited installation area, a compact compressed air dehumidification system is nowadays desired.

[0005] Therefore, an object of the present invention is to provide a compressed air dehumidification system that is miniaturized to meet such demands.

[0006]

SUMMARY OF THE INVENTION A compressed air dehumidification system according to the present invention is provided with a suction pipe provided on a secondary side via a check valve and a pipe provided on a secondary side of the suction pipe via a throttle valve. Was
A separation membrane dehumidifier having a hollow fiber formed of a polymer material that excludes water vapor in the air, and a pipe between the compressed air supply source and the primary side of the adsorption cylinder and the separation membrane dehumidifier. A directional control valve.

[0007] The compressed air dehumidification system of the present invention comprises:
It is preferable to have a pressure detecting means for detecting a secondary pressure downstream of the check valve, and a control means for switching the direction control valve in accordance with a set pressure detection signal transmitted from the pressure detecting means. Further, the compressed air dehumidification system of the present invention further comprises a flow rate detecting means for detecting a flow of air at the downstream side of the check valve, and the direction control valve based on a detection signal indicating the flow of air transmitted from the flow rate detecting means. It is preferable to have control means for switching between the two.

Further, the compressed air dehumidification system of the present invention comprises:
It is preferable that the adsorption cylinder, the separation membrane type dehumidifier, the direction control valve, the check valve, and the throttle valve are integrally unitized. Further, the compressed air dehumidification system of the present invention may further include a pressure detection unit that detects a secondary pressure downstream of the check valve or a flow detection unit that detects an air flow downstream of the check valve; It is preferable that the control means for switching the direction control valve by means of a predetermined detection signal transmitted from the means or the pressure detection means is integrally unitized.

Further, the compressed air dehumidification system of the present invention comprises:
It is preferable that a check valve is provided between the separation membrane dehumidifier and the throttle valve. Further, in the compressed air dehumidification system of the present invention, it is preferable that an exhaust port of the direction control valve opened to the atmosphere is connected to a purge flow path of the separation membrane dehumidifier. In the compressed air dehumidification system of the present invention, it is preferable that the direction control valve is an electromagnetic four-way valve.

[0010]

Next, an embodiment of a compressed air dehumidifying system according to the present invention will be specifically described with reference to the drawings. 1 and 2 show a first example of the compressed air dehumidification system.
FIG. 1 is a block diagram showing an embodiment, and FIG.
FIG. 2 is at the time of reproduction. Here, the time of dehumidification refers to the time when dry compressed air is supplied to the secondary side, and the time of regeneration refers to the time when moisture contained in the adsorbent taken from the compressed air during dehumidification is removed. . The compressed air dehumidification system 1 mainly includes an adsorption column 2 containing an adsorbent and a separation membrane type dehumidifier 3 having hollow fibers formed of a predetermined polymer material for discharging moisture in the supplied compressed air. A directional control valve 4 for controlling the flow direction of the compressed air, a check valve 5 for preventing a backflow from the output side of the compressed air, and a throttle valve 6 for reducing the pressure of the compressed air. Have been. In the present embodiment, a 4-port solenoid valve is used as the direction control valve 4.

The compressed air dehumidifying system 1 dehumidifies compressed air by utilizing the property that the adsorbent filled in the adsorption cylinder 2 always keeps a state of equilibrium with the surrounding air. The inside is filled with the adsorbent. On the other hand, FIG. 3 is a schematic diagram showing the hollow fiber 21 which is loaded into the separation membrane type dehumidifier 3 and through which compressed air passes. The hollow fiber 21 serves as a means for regenerating the wet adsorbent. Therefore,
The principle of dehumidification of the hollow fiber 21 will be briefly described. Although gas molecules can freely enter and exit inside the polymer material, the ease of entry and exit varies greatly depending on the mutual properties of the gas and the polymer material. Therefore, in order to remove only moisture from the compressed air, the hollow fiber 21 used in the present separation membrane type dehumidifier 3 is made of a polymer material having a property that "nitrogen and oxygen are difficult to enter and exit, and moisture is easy to enter and exit". I decided to adopt it.

Therefore, in the hollow fiber 21 formed of a material having such properties, when moist air is supplied into the hollow fiber 21, each gas in the air has a concentration inside the hollow fiber 21. Because they are in a high state, each gas tends to move towards the outside of the less concentrated hollow fiber. However, since the hollow fiber 21 is formed of a polymer material to which only steam easily enters and exits, only steam of each gas can move to the outside. Therefore, the moist air supplied into the hollow fiber 21 is discharged as dry compressed air from which water vapor has been removed. On the other hand, if the dry air formed by the hollow fiber 21 is supplied to the outside of the hollow fiber 21 as purge air for the hollow fiber 21 performing such a dehumidifying function, the water vapor that has moved to the outside through the hollow fiber 21 can be quickly converted. At the same time, the water vapor concentration outside the hollow fiber 21 is kept low.

On the other hand, in the directional control valve 4, an input port I is connected to a compressed air supply source 7 such as a compressor for supplying compressed air, and the compressed air is supplied to the adsorption tube 2 or the separation membrane type dehumidifier 3 through a pipe line 8. , 9 are connected. Suction cylinder 2
Alternatively, the communication between the input / output ports A and B of the directional control valve 4 to which the separation membrane dehumidifier 3 is connected is alternately switched with the input port I by the valves. The input / output port B to which the adsorption cylinder 2 is connected is connected to an exhaust port E opened to the atmosphere 13 by switching a valve. The adsorption cylinder 2 is connected to a pipe 10 and is connected to a secondary side 12 for supplying compressed air via a check valve 5. On the other hand, the separation membrane type dehumidifier 3 includes a throttle valve 6 on the way, and is connected to a pipe 11 connected to a pipe 10.

Therefore, in the compressed air dehumidifying system 1 having such a configuration, the compressed air supplied from the compressed air supply source 7 while still wet is supplied to the input port I of the directional control valve 4.
Flows to Therefore, when the compressed air is consumed on the secondary side, the directional control valve 4 is connected to the input port I and the input / output port B as shown in FIG. Flows into the adsorption column 2. The compressed air that has entered the adsorption cylinder 2 is removed from the moisture by the adsorbent, becomes dry compressed air, and is supplied to the secondary side through the check valve 5 of the pipe 10. On the other hand, a part of the dry compressed air that has passed through the adsorption cylinder 2 flows to the pipe 11 connected to the pipe 10,
The pressure is reduced to the atmospheric pressure by the throttle valve 6 and supplied to the separation membrane dehumidifier 3. However, since the primary side of the separation membrane type dehumidifier 3 is closed by the directional control valve 4, the purge orifice 3
The dry air that has passed through the purge introduction hole 37 via 5 keeps the hollow fiber 21 in a dry state and is discharged from the discharge port 36 to the atmosphere.

On the other hand, when the compressed air is not consumed on the secondary side, the direction control valve 4 is switched so that the input port I is communicated with the input / output port A and the input / output port B Is connected to the exhaust port E. Therefore, the moist compressed air is supplied to the separation membrane dehumidifier 3 through the pipe 8. The compressed air supplied into the separation membrane dehumidifier 3 enters the hollow fiber 21 provided in the separation membrane dehumidifier 3 as described above, where only the water vapor is transferred to the outside, and the dried compressed air is removed. Flows to the pipeline 11. Then, the dry compressed air is reduced in pressure to the atmospheric pressure by the throttle valve 6, and becomes dry air having a very low relative humidity. The dry air that has flowed into the pipe 10 is supplied to the adsorption tube 2 without flowing to the secondary side 12 by the check valve 5, and removes and regenerates the water content of the wet adsorbent in the adsorption tube 2. Then, the air containing the moisture of the adsorbent is discharged from the pipe 9 to the atmosphere 13 through the directional control valve 4.

Here, FIG. 4 shows a compressed air dehumidification system 1.
FIG. 4 is a diagram showing an operation chart of FIG. As shown in the figure, the compressed air dehumidification system 1 is driven intermittently, and dehumidification and regeneration are repeatedly performed by a control unit (not shown). Therefore, the amount of water contained in the adsorbent of the adsorption column 2 increases during dehumidification, and during regeneration, the amount of water decreases again and is dried. By the way, at the time of dehumidification, a small amount of dry air dehumidified by the adsorption tube 2 is supplied to the purge orifice 35 of the separation membrane type dehumidifier 3 as described above. Also.
Even during the regeneration in which the supply on the secondary side is stopped, a part of the dry air dehumidified by the separation membrane dehumidifier 3 itself is supplied to the purge orifice 35. Therefore, the dry air is always
, The water vapor concentration outside the hollow fiber 21 is kept low.

Therefore, according to the compressed air dehumidification system 1 of the present embodiment, the adsorbent of the adsorption column 2 is regenerated by using the dry air from the separation membrane type dehumidifier 3. It is not necessary to temporarily store dry air as in the example, and since the separation membrane type dehumidifier 3 itself is small, the entire system is downsized. Therefore, the larger the capacity of the dehumidifier used, the larger the capacity of the tank in the conventional one, but according to the present system, it is not particularly necessary to increase the size of the separation membrane type dehumidifier 3 and to reduce the size of the system. Can be maintained. Further, the time and effort of maintenance and management peculiar to a pressure vessel such as a tank are not required. In addition, safety is improved because a large amount of compressed air is not stored. In addition, the adsorption cylinder 2 is regenerated by the intermittent operation,
Since the periphery of the hollow fiber 21 of the separation membrane type dehumidifier 3 is kept in a dry state, the dry compressed air that has been dehumidified is always reliably supplied to the secondary side.

Next, a second embodiment of the compressed air dehumidification system will be described. FIG. 5 is a block diagram showing a compressed air dehumidification system according to the present embodiment, and portions common to the first embodiment will be described with the same reference numerals.
That is, in the present embodiment, the pressure switch 41 is connected to the downstream side of the check valve 5 and further connected to the control circuit 42 for controlling the direction control valve 4. The pressure switch 41 sends a signal to the control circuit 42 based on the set pressure.
Therefore, in the compressed air dehumidification system 1 of the present embodiment,
Automatic control according to the consumption of the compressed air on the secondary side becomes possible.

More specifically, if the compressed air is supplied to the adsorption column 2 and the dry compressed air is continuously supplied to the secondary side, and then the consumption of the compressed air on the secondary side is stopped, the supply of compressed air is continued. The air causes the secondary pressure to exceed the upper limit set pressure set by the pressure switch 41. In such a case, a predetermined signal is transmitted from the pressure switch 41 to the control circuit 42, and the control circuit 42 that has received the signal switches the direction control valve 4 so as to supply the compressed air to the separation membrane dehumidifier 3 side.
Then, the adsorption cylinder 2 is regenerated as described in the first embodiment.

Thereafter, when the consumption of air on the secondary side starts again, the secondary side pressure falls below the lower limit set by the pressure switch 41. In such a case, a predetermined signal is transmitted from the pressure switch 41 to the control circuit 42,
The control circuit 42 that has received the signal switches the direction control valve 4 so as to supply the compressed air to the regenerated adsorption cylinder 2 side. Therefore, in the present embodiment, the directional control valve 4 is automatically controlled according to the consumption of the dry compressed air on the secondary side, and the compressed air from the compressed air supply source 7 is supplied to the adsorption cylinder 2 or the separation membrane dehumidifier 3 respectively. It is distributed to.

Next, a third embodiment of the compressed air dehumidifying system will be described. FIG. 6 is a block diagram showing a compressed air dehumidification system according to the present embodiment, and portions common to the first embodiment will be described with the same reference numerals.
That is, in the present embodiment, a flow meter 46 is provided downstream of the check valve 5, and is connected to a control circuit 47 for controlling the direction control valve 4. The flow meter 46 detects the presence or absence of the flow of the compressed air to the secondary side, whereby a signal to the control circuit 47 is transmitted. Therefore, also in the compressed air dehumidification system 1 of the present embodiment, automatic control according to consumption of the compressed air on the secondary side can be performed.

Specifically, if the compressed air is supplied to the adsorption column 2 and the dry compressed air is continuously supplied to the secondary side, and then the consumption of the air on the secondary side is stopped, the flow on the secondary side becomes When the flow is stopped, a predetermined signal is transmitted from the flow meter 46 to the control circuit 47, and the control circuit 47 which has received the signal switches the direction control valve 4, and switches the supply of the compressed air to the separation membrane dehumidifier 3 side. Then, the adsorption cylinder 2 is regenerated as described in the first embodiment. On the other hand, when the consumption of air on the secondary side starts, the compressed air flows again, a predetermined signal is transmitted from the flow meter 46 to the control circuit 47, and the control circuit 47 which has received the signal regenerates the compressed air. The direction control valve 4 is switched so as to supply the suctioned cylinder 2 to the selected side. Therefore, in the present embodiment, the supply of the compressed air is automatically controlled in accordance with the consumption on the secondary side, and dehumidification and regeneration are performed.

Next, a fourth embodiment of the compressed air dehumidifying system will be described. FIG. 7 is a block diagram showing a system according to the present embodiment, and portions common to the first embodiment will be described with the same reference numerals. The system unit 51 of the present embodiment is characterized by a unit in which the components such as the adsorption tube 2, the separation membrane dehumidifier 3, and the directional control valve 4 described in the first embodiment are integrated. That is, the directional control valve 4 has an input port I connected to a compressed air supply source 7 such as a compressor for supplying compressed air, and connects the compressed air to the adsorption tube 2 or the separation membrane dehumidifier 3 through the pipelines 8 and 9. The input / output ports A and B are connected via the I / O port. Further, the adsorption cylinder 2 is connected to a pipe 10 and is connected to a secondary side 12 via a check valve 5. On the other hand, the separation membrane type dehumidifier 3 is connected to the conduit 11 via the throttle valve 6 on the way. The components connected as described above form an integral unit by the frame 52.

Therefore, the system unit 51 of the present embodiment is configured such that the input port I of the direction control valve 4
The compressed air that has entered through the pipe 9 flows into the adsorption cylinder 2 through the pipe 9. In the adsorption cylinder 2, the compressed air that has descended from the hollow portion at the center rises through the space between the adsorbents filled in the cylindrical container. During this time, the moisture in the compressed air is removed, and the dry compressed air flows to the pipe 10 and is supplied to the secondary side 12 through the check valve 5. On the other hand, at the time of regeneration, the direction control valve 4 is switched, and the compressed air entering from the input port I flows to the separation membrane type dehumidifier 3 through the pipe 8. In the separation membrane type dehumidifier 3, the compressed air descends in the hollow fiber 21 loaded in the cylindrical container, and during that time, the water vapor in the compressed air is removed. Then, the dry compressed air descends to the lower end of the separation membrane type dehumidifier 3, rises through the central hollow portion, is decompressed to the atmospheric pressure by the throttle valve 6 of the line 11, and
Is supplied to the inside of the adsorption tube 2. The compressed air that has entered the adsorption tube 2 first passes through the cylindrical container filled with the adsorbent to deprive the adsorbent of moisture, and then passes through the central hollow portion, and 9 and is discharged from the directional control valve 4 to the atmosphere 13.

Here, the flow of the compressed air of the separation membrane type dehumidifier 3 will be described in more detail. FIG. 8 is a sectional view showing the separation membrane type dehumidifier 3. The separation membrane type dehumidifier 3 has a cylindrical shape, and input / output ports 31, 32 are formed at the upper end thereof.
A cylindrical body 34 is coaxially arranged in an external cylindrical container 33, and the hollow fiber 21 is loaded between the cylindrical container 33 and the cylindrical body 34. The input / output port 31 communicates with a space between the cylindrical container 33 loaded with the hollow fiber 21 and the cylindrical body 34, and the input / output port 32 communicates with the inside of the cylindrical body 34. And the input / output ports 31, 32
Are communicated at the bottom of the cylindrical container 33. At the lower end of the cylindrical body 34, a purge orifice 35 formed inside the cylindrical body 34 and an outside of the cylindrical body 34,
A hollow cylindrical body 38 communicating with a purge introduction hole 37 drilled in the space side where the space 1 is loaded is fitted.

In such a separation membrane type dehumidifier 3, for example, at the time of regeneration, a flow of compressed air is created as shown by the arrow in the figure. The compressed air that has entered the separation membrane dehumidifier 3 from the input / output port 31 flows downward through the hollow fiber 21 in the cylindrical container 33. The compressed air is changed to dry compressed air when the steam is gradually removed in the hollow fiber 21 and reaches the bottom. Most of the dry compressed air rises inside the cylindrical body 34 and is output from the input / output port 32. On the other hand, part of the dry compressed air that reaches the bottom and rises in the cylindrical body 34 flows through the purge orifice 35 to the hollow fiber 21 again. At this time, the dry compressed air is squeezed and reduced to atmospheric pressure. Then, the dry compressed air flows around the hollow fiber 21 and discharges the water vapor outside the hollow fiber 21 from the discharge port 36 to the atmosphere. Accordingly, in the separation membrane type dehumidifier 3, dry compressed air is produced by the hollow fibers 21 and the surroundings of the hollow fibers 21 themselves are simultaneously kept dry.

Thus, in the present embodiment, by configuring such a unit, compactness can be realized and mounting thereof is extremely easy. Other functions and effects are the same as those described in the first embodiment, and will not be described here. Although FIG. 7 shows the one corresponding to the first embodiment, the pressure switch 41 and the flow meter 46 shown in the second and third embodiments described above.
(Hereinafter referred to as a detector) and a control circuit may be integrally unitized. FIG. 9 is a fifth embodiment showing a compressed air dehumidification system 56 in which the detector 57 and the control circuit 58 are integrally unitized by a frame 53.
The configuration and the operation and effect are the same as those described above, and are not described here.

Next, a description will be given of a sixth embodiment of the compressed air dehumidification system. FIG. 10 is a block diagram showing a compressed air dehumidification system 61 of the present embodiment, and portions common to the first embodiment will be described with the same reference numerals. That is, the compressed air dehumidification system 61 of the present embodiment
Is to cut off the flow of compressed air flowing to the separation membrane dehumidifier 3 during dehumidification by providing a check valve 62 in the first embodiment to reduce the discharge amount of compressed air. It is. In the first embodiment shown in FIG.
Most of the compressed air dried through the adsorption tube 2 during the dehumidification flows through the pipe 10 to the secondary side 12, but partially flows to the pipe 11 and is used as purge air as a separation air dehumidifier. 3 had been discharged. For this reason, air was constantly discharged from the separation membrane type dehumidifier 3 regardless of the time of dehumidification and the time of regeneration. Therefore, by providing the check valve 62, the flow of air during dehumidification is cut off, and the amount of discharged air is reduced.

Here, FIG. 11 compares the amount of air discharged depending on the presence or absence of the check valve 62. FIG. 11A shows the first embodiment, and FIG. 11B shows this embodiment. Note that FIG. 11 (c) shows a seventh
The embodiments are shown in parallel. In FIG. 11A without the check valve 62, constant air is discharged from the separation membrane type dehumidifier 3 also at the time of dehumidification in which compressed air is consumed on the secondary side 12 and at the time of regeneration of the adsorption cylinder 2. . Therefore, the total amount of discharged air does not become zero, and is always discharged to the atmosphere although it is small. On the other hand, in the compressed air dehumidification system 61 of the present embodiment, air does not flow to the separation membrane dehumidifier 3 due to the check valve 62 during dehumidification.

Therefore, even if the amount of exhaust gas discharged at one time of dehumidification is very small, it corresponds to a considerable amount in the total of all operation times. Could be greatly reduced. Since the dry air does not flow toward the separation membrane dehumidifier 3 during dehumidification, and the separation membrane dehumidifier 3 is not kept in a dry state, the rising of the separation membrane dehumidifier 3 during regeneration is delayed. If the intermittent stop time, that is, the reproduction time is long, there is no practical problem.

Next, a seventh embodiment of the compressed air dehumidifying system will be described. FIG. 12 is a block diagram showing a compressed air dehumidification system 71 of the present embodiment, and portions common to the first embodiment will be described with the same reference numerals. That is, the compressed air dehumidification system 71 of the present embodiment
Is the exhaust port E of the directional control valve 4 that has been opened to the atmosphere.
Is connected to the purge introduction hole 37 of the separation membrane type dehumidifier 3 via the conduit 72. Therefore, as shown in FIG. 11C, in the compressed air dehumidification system 71 of the present embodiment, at the time of dehumidification, the air flowing to the separation membrane dehumidifier 3 is not discharged to the atmosphere at all. This is because the air flowing to the separation membrane type dehumidifier 3 during dehumidification is not discharged to the atmosphere because the input / output port 32 is not communicated with the purge introduction hole 37.

On the other hand, at the time of regeneration, the dry compressed air dehumidified by the separation membrane type dehumidifier 3 is reduced in pressure to the atmospheric pressure and supplied to the adsorption column 2. The gas enters the purge introduction hole 37 of the separation membrane type dehumidifier 3 through the conduit 72, and is discharged to the atmosphere from the discharge port 36 together with the moisture permeated from the hollow fiber 21. As described above, the dry compressed air generated by the separation membrane type dehumidifier 3 is used as purge air for the hollow fiber 21 after the adsorbent in the adsorption column 2 is once regenerated, and is first used for the regeneration of the adsorbent. At this time, the humidity in the air is still sufficiently low, so that the hollow fiber 21 can sufficiently exert its effect as purge air. Therefore, in the compressed air dehumidification system 71 of the present embodiment, the exhaust air amount is eliminated by eliminating the exhaust air during the dehumidification and using the dry air generated by the separation membrane dehumidifier 3 even during the regeneration. It was reduced as much as possible.

Although several embodiments of the compressed air dehumidifying system of the present invention have been described above, the present invention is not limited to these embodiments, and various changes can be made without departing from the gist of the present invention. is there. For example, as an example, in each of the above embodiments, a solenoid valve is used as the direction control valve 4, but a mechanical control valve may be used.

[0034]

According to the present invention, there is provided a suction pipe which is piped to the secondary side through a check valve, and a high pressure pipe which is piped to the secondary side of the suction pipe through a throttle valve to eliminate water vapor in the air. Since it has a separation membrane type dehumidifier equipped with a hollow fiber formed from a molecular material, and a directional control valve piped between a compressed air supply source, an adsorption cylinder, and a primary side of the separation membrane type dehumidifier, it is compact. It has become possible to provide a simplified compressed air dehumidification system.

Further, according to the present invention, there is provided a pressure detecting means for detecting the pressure on the secondary side or a flow rate detecting means for detecting the flow rate on the secondary side from the adsorption cylinder, and a setting transmitted from the pressure detecting means or the flow rate detecting means. By providing the control means for switching the direction control valve in accordance with the detection signal, it is possible to provide a compressed air dehumidification system that automatically controls the intermittent operation according to the consumption of the compressed air on the secondary side. Also, the present invention
Since a check valve is provided between the separation membrane dehumidifier and the throttle valve, or the exhaust port opened to the atmosphere of the directional control valve is connected to the purge orifice of the separation membrane dehumidifier, the compressed air to be supplied is provided. It has become possible to provide a compressed air dehumidification system in which the consumption of air is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram at the time of dehumidification showing a first embodiment of a compressed air dehumidification system.

FIG. 2 is a block diagram at the time of regeneration showing the first embodiment of the compressed air dehumidification system.

FIG. 3 is a schematic diagram showing a hollow fiber provided in a separation membrane type dehumidifier 3;

FIG. 4 is a diagram showing an operation chart of the compressed air dehumidification system.

FIG. 5 is a block diagram showing a second embodiment of the compressed air dehumidification system.

FIG. 6 is a block diagram showing a third embodiment of the compressed air dehumidification system.

FIG. 7 is a block diagram showing a fourth embodiment of the compressed air dehumidification system.

FIG. 8 is a sectional view showing a separation membrane type dehumidifier.

FIG. 9 is a block diagram showing a fifth embodiment of the compressed air dehumidification system.

FIG. 10 is a block diagram showing a sixth embodiment of the compressed air dehumidification system.

FIG. 11 is a diagram comparing the amount of air discharged depending on the presence or absence of a check valve.

FIG. 12 is a block diagram showing a seventh embodiment of the compressed air dehumidification system.

FIG. 13 is a block diagram showing a conventional compressed air dehumidification system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressed air dehumidification system 2 Adsorption cylinder 3 Separation membrane type dehumidifier 4 Directional control valve 5 Check valve 6 Throttle valve 21 Hollow fiber 8, 9, 10, 11 Pipe line

[Procedure amendment]

[Submission date] April 9, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

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FIG. 11 ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 10, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 10

FIG.

FIG.

FIG. 2

FIG. 3

FIG. 4

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Claims (8)

[Claims] 1. A suction pipe which is piped to the secondary side via a check valve, and a polymer material which is piped to the secondary side of the suction pipe via a throttle valve to remove water vapor in the air. It has a separation membrane type dehumidifier provided with the formed hollow fiber, and a directional control valve piped between the compressed air supply source and the primary side of the adsorption cylinder and the separation membrane type dehumidifier. Compressed air dehumidification system. 2. The compressed air dehumidification system according to claim 1, wherein a pressure detection unit that detects a secondary pressure downstream of the check valve, and a detection signal of a set pressure transmitted from the pressure detection unit. Control means for switching the direction control valve. 3. The compressed air dehumidification system according to claim 1, wherein a flow detecting means for detecting a flow of air downstream of the check valve, and a detection indicating a flow of air transmitted from the flow detecting means. Control means for switching the directional control valve according to a signal. 4. The compressed air dehumidification system according to claim 1, wherein the adsorption cylinder, the separation membrane dehumidifier, the direction control valve, the check valve, and the throttle valve are integrally formed as a unit. Compressed air dehumidification system characterized in that: 5. The compressed air dehumidification system according to claim 4, wherein a pressure detection means for detecting a secondary pressure downstream of the check valve or a flow rate detection for detecting a flow of air downstream of the check valve. And a control means for switching the direction control valve in accordance with the pressure detection means or a predetermined detection signal transmitted from the pressure detection means. 6. The compressed air dehumidification system according to claim 1, wherein a check valve is provided between the separation membrane type dehumidifier and a throttle valve. Dehumidification system. 7. The compressed air dehumidification system according to claim 1, wherein an exhaust port of the directional control valve opened to the atmosphere is connected to a purge flow path of the separation membrane dehumidifier. Compressed air dehumidification system. 8. The compressed air dehumidification system according to claim 1, wherein the directional control valve is an electromagnetic four-way valve.