JP2623434C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION       [0001]     [Industrial applications]   The present invention uses a membrane air dryer for the compressed air discharge piping of the air compressor. The present invention relates to an interposed air compression device.       [0002]     [Prior art]   Compressed air is sent from one end of the hollow fiber disposed in the casing to form a hollow fiber membrane.
The water in the compressed air is extracted into the low-pressure steam chamber surrounding the hollow fiber through
Obtain compressed air from which moisture has been removed from the other end, and a part of the compressed air from which the moisture has been removed.
Is sent to the steam chamber as purge air, and the steam in the steam chamber is drained from the exhaust port.
The compressed air of the air compressor
An air compression device interposed in a pipe has been proposed.       [0003]   Such an air compressor is shown in FIG. Discharge distribution of compressed air from air compressor 1
The tube 4 is provided with a membrane air dryer 2.       [0004]   The compressed air flowing from the compressed air inlet 2a of the membrane air dryer 2 is dried.
A hollow fiber membrane constituting the hollow fiber passes through the hollow fiber on the way to the compressed air outlet 2b.
The steam is extracted and the steam exits the steam chamber outside the hollow fiber. Through the hollow fiber
Moisture is removed from the compressed air, and the compressed air is dried through the compressed air outlet 2b.
It flows out to the discharge pipe 4 facing the playgun 3. This membrane air dryer 2 and
The purge air pipe 5 branched from the discharge pipe 4 between the playguns 3
The gas enters the steam chamber from the purge air inlet 2c via the flow control valve 6, and the water in the steam chamber is
The steam is mixed with the purge air and discharged to the atmosphere from the exhaust port 2d of the steam chamber.       [0005]   Such a membrane air dryer has an atmospheric dew point of, for example, a compressed air pressure of 7 kg.
/ Cm^Two-40 ° C. and low drainage. Also refrigerated air dryer
Since no compressor is used unlike earbuds, there is no problem of air pollution due to chlorofluorocarbon.
Noise and no need for electrical wiring to the compressor.       [0006]     [Problems to be solved by the invention]   In a membrane air dryer, water vapor permeates from the inside to the outside of the hollow fiber, Qi is hard to penetrate. The inner side of this hollow fiber is compressed air pressure and the outer side is low pressure.
By reducing the mole fraction of air, dry compressed air with a lower dew point is obtained. Pa
Using part of dry compressed air generated by membrane air dryer
Thereby, the mole fraction of the steam chamber can be reduced.       [0007]   Generally, dry compressed air obtained with a membrane air dryer is separated into purge air.
As the percentage increases, the dew point decreases. For this reason, for example, the compressed air pressure is set to 7
kg / cm^TwoAssuming that the atmospheric pressure dew point is -40 ° C, purge air flow and pneumatic equipment
The ratio of the flow rate to the dry compressed air to be sent is about 20 to 40%.       [0008]   As shown in FIG. 12, the purge air is sprayed with the membrane air dryer 2.
Purge air pipe 5 branched from compressed air discharge pipe between guns 3, purge air flow rate
After passing through the regulating valve 6 and the purge air inlet 2c, the inside of the membrane air dryer 2
The gas flows into the steam chamber and is exhausted from an exhaust port 2d communicating with the purge air inlet 2c.
Is done. Therefore, even if the blowing of the spray gun 3 is stopped and the use of the compressed air is stopped,
Since compressed air is supplied from the air compressor 1, the air compressor 1
1 → membrane air dryer 2 → dry compressed air outlet 2b → purge air pipe 5 →
Since the compressed air always flows out from the purge air inlet 2c → the exhaust port 2d →
The pressure control method of the compressor 1 is independent of the pressure switch method or the unloader method.
Continue running without driving.       [0009]   Therefore, power is consumed unnecessarily, and the durability of the air compressor is impaired.       [0010]   The present invention stops the supply of purge air when the pneumatic equipment stops operating,
It is an object of the present invention to provide an air compressor that solves the above-mentioned problems.       [0011]     [Means for Solving the Problems]   The first invention of the present invention is to supply compressed air from one end of a hollow fiber disposed in a casing.
The water in the compressed air is extracted through the hollow fiber membrane into the steam chamber surrounding the hollow fiber. To obtain compressed air from which moisture was removed from the other end of the hollow fiber, and the moisture was removed.
Part of the compressed air is sent to the steam chamber as purge air to remove the steam in the steam chamber.
The membrane air dryer, which is discharged from the exhaust port, is
An air compressor installed in the compressed air discharge piping between pneumatic devices that use compressed air
When the pneumatic equipment using compressed air is stopped, the purge air flows into the steam chamber.
A means to ban immediately, Compression between air compressor and membrane air dryer
Connect to the air discharge piping or the exhaust port of the steam chamber of the membrane air dryer.Setting
It is an air compression device characterized by the fact that it is radiated.       [0012]   The second invention of the present invention relates to a compressed air between an air compressor and a membrane air dryer.
An automatic valve is interposed in the air discharge pipe, and the air
A check valve and a compressed air pressure sensor are sequentially placed in the compressed air discharge pipe in the direction of the compressed air flow.
Or a flow sensor, and this pressure sensor detects the upper limit pressure of the compressed air pressure
Signal or a signal indicating that the flow rate sensor has reached the lower limit flow rate.
Provision of a control device that closes the valve prevents the purge air from flowing into the steam chamber
The air compressor according to the first aspect of the present invention, wherein       [0013]   The third invention of the present invention relates to a compressed air between an air compressor and a membrane air dryer.
An automatic valve is interposed in the air discharge pipe to compress air between the membrane air dryer and pneumatic equipment.
An automatic valve and an air tank are interposed in this order according to the flow of compressed air in the air discharge pipe.
A pressure sensor is provided in the air tank, and the upper limit pressure of the compressed air in the air tank is
A control device that closes each of the automatic valves according to the signal detected by the force sensor is installed and purged.
The first invention is characterized in that it is means for inhibiting the flow of air into the steam chamber.
It is an air compressor of the above.       [0014]   The fourth invention of the present invention relates to a compressed air between an air compressor and a membrane air dryer.
An automatic valve is interposed in the air discharge pipe to compress air between the membrane air dryer and pneumatic equipment.
From the membrane air dryer to the pneumatic equipment according to the flow of compressed air to the air discharge pipe
A check valve and an air tank that allow compressed air to flow only toward A pressure sensor is installed in the air tank, and the upper limit pressure of the compressed air in the air tank is
A control device for closing the automatic valve in accordance with the signal detected by
The air pressure according to the first invention, wherein the air pressure is a means for inhibiting inflow into the air chamber.
Compression device.       [0015]   A fifth aspect of the present invention is a method for discharging compressed air between a membrane air dryer and a pneumatic device.
An automatic valve and an air tank are interposed in this order according to the flow of compressed air in the piping, and
Connect an automatic valve to the exhaust port of the steam chamber of the membrane air dryer and apply pressure to the air tank.
A sensor is provided, and this pressure sensor detects the upper limit pressure of the compressed air in the air tank.
A control device for closing each of the automatic valves according to a signal is provided to supply purge air to the steam chamber.
The air compressor according to the first invention, wherein the means for inhibiting inflow is provided.
is there.       [0016]   According to a sixth aspect of the present invention, a compressed air between an air compressor and a membrane air dryer is provided.
An automatic valve is interposed in the air discharge pipe to compress air between the membrane air dryer and pneumatic equipment.
An automatic valve and an air tank are interposed in this order according to the flow of compressed air in the air discharge pipe.
, Connect an automatic valve to the exhaust port of the steam chamber of the membrane air dryer, and pressurize the air tank.
A force sensor is provided, and this pressure sensor detects the upper limit pressure of the compressed air in the air tank.
A control device is provided to close each of the automatic valves in response to the generated
The air compressor according to the first invention, characterized in that the air compressor is configured to prohibit inflow of air.
It is.       [0017]   According to a seventh aspect of the present invention, an automatic valve is provided at an exhaust port of a steam chamber of a membrane air dryer.
Connect the compressed air discharge piping between the membrane air dryer and the pneumatic equipment.
A pressure sensor or a flow sensor is interposed, and the pressure sensor detects the upper limit of compressed air pressure
Signal or a signal indicating that the flow rate sensor has reached the lower limit flow rate.
A control device that closes the valve is provided to prevent the purge air from flowing into the steam chamber.
The air compression device according to the first aspect, wherein the air compression device is a means for stopping.       [0021]     【Example】   Hereinafter, embodiments of the present invention will be described with reference to the drawings.       [0022]   "Example 1"   FIG. 1 is a flow sheet of the first embodiment.       [0023]   A discharge pipe 4 for compressed air of the air compressor 1 is a pneumatic device such as a spray gun 3.
The discharge pipe 4 is provided with a membrane air dryer 2.       [0024]   The air compressor 1 has a motor 26 and a bell
And a compressor 28 driven via a heating device 27. Compressor 28 silence and fill
The air is sucked through the air heater 29, pressurized and discharged to the compressed air tank 25.
I have. The pressure switch 31 for detecting the compressed air pressure in the compressed air tank 25 is connected to a power supply and a motor.
Data 26. Incidentally, the control of the compressed air pressure may be of an unloader type.
No.       [0025]   From the compressed air tank 25, the compressed air discharge pipe 4 is connected to the pressure of the membrane air dryer 2.
The air compressor 1 and the membrane air dryer communicate with the compressed air inlet 2a.
An automatic valve 8 such as an electric valve or a solenoid valve is interposed in the discharge pipe 4 between the discharge pipe 2 and the discharge pipe 2.
The compressed air discharge pipe 4 between the membrane air dryer 2 and the spray gun 3
Is a pressure sensor for detecting the upper limit pressure of the compressed air, for example, a pressure switch, or a compressed air
A flow rate sensor that detects that the air flow rate has become zero, for example, compression of a flow rate switch, etc.
A compressed air condition detector 7 for detecting a condition of air is provided. Compressed air condition detection
Immediately upstream with respect to the flow of compressed air from the discharger, a membrane air dryer is connected to the discharge pipe 4.
2 is provided with a check valve 10 for flowing compressed air only in the direction of the compressed air condition detector 7.
ing. A signal obtained by the compressed air condition detector 7 is supplied to a control device (not shown) (not shown).
The automatic valve 8 is driven by a wiring 9 interposed with a width device.       [0026]   FIG. 2 is a longitudinal sectional view of the membrane air dryer.       [0027]   The membrane air dryer 2 has a large number of hollow fibers 35 disposed in a casing 34,
A dispersion chamber 36 and a collection chamber 37 are formed above and below the casing 34,
Partition plates 30 and 32 are provided so as to form a steam chamber 38 between 36 and the collecting chamber 37.
The partitioning plates 30, 32 support both ends of the hollow fiber 35, and open both ends of the hollow fiber 35.
The distribution room 36 and the collection room 37 are viewed. The dispersion chamber 3 is provided in the casing 34.
6 and the compressed air inflow port 2a that communicates with the outside, and the dry air that communicates with the collecting chamber 37 and the outside
The outlet 2b, the purge air inlet 2c that communicates with the steam chamber 38 and the outside, and the exhaust port 2d
Is provided. The purge air inlet 2c and the exhaust port 2d are located far from the steam chamber 38.
The casings 34 are provided near the partition plates 30 and 32 respectively.       [0028]   As shown in FIG. 1, between the dry compressed air outlet 2b and a pneumatic device such as a spray gun 3.
The purge air pipe 5 branched from the middle of the discharge pipe 4
Through the purge air inlet 2c. The purge air pipe 5 is dry compressed air
Even if the purge air is directly taken out of the collecting chamber 37 by being connected to the air outlet 2b,
The function is the same as that in the case of branching out of the outlet pipe 4.       [0029]   The hollow fiber 35 has a cylindrical shape with a hole diameter of about 300 μ as shown in FIG. The surrounding wall
Is a polyimide resin separation membrane that is very permeable to water vapor and difficult to transmit air.
There is a property called. According to the hollow fiber 35, for example, a low dew point as low as an atmospheric pressure dew point of −40 ° C.
Easy to obtain dry compressed air. The operation of the hollow fiber 35 is indicated by an arrow in FIG.
A, steam S and dry compressed air D (round) are introduced into the hollow fiber 35 from one end of the hollow fiber 35 as shown in FIG.
Mark indicates nitrogen, and flat circle indicates oxygen).
5 is kept at a low pressure, only the water vapor S goes out through the hollow fiber membrane and
From the other end of the empty yarn 35, only the dry compressed air D flows out.       [0030]   Since the hollow fiber 35 is thin as described above, compressed air of 200 Nl / min is flowed.
1000 to 1500 pieces are needed.       [0031]   In the above case, when the compressed air condition detector 7 is a pressure switch, the spray gun 3
In order to obtain a quick response to a spurt stop, set the upper limit pressure of this pressure switch.
Is smaller than the set upper limit pressure of the pressure switch 31 of the air compressor 1.
Good.       [0032]   The operation of the above configuration will be described. In the air compressor 1, a compressed air tank
When the lower limit pressure of 25 is detected, the pressure switch 31 is closed and the motor 26 is energized.
, A motor 26 drives a compressor 28 via a belt device 27, and the compressor 28
Is sucked and pressurized through a silencer and a filter device 29, and is discharged to the compressed air tank 25. This
As a result, the compressed air pressure in the compressed air tank 25 rises, and when it reaches the upper limit pressure, the pressure
The switch 31 is opened, and the motor 26 and the compressor 28 are stopped. Thus, the compressor 2
8 is an on / off control performed by the upper and lower limits of the compressed air pressure in the compressed air tank 25.
The compressed air pressure in the compressed air tank 25 fluctuates between the upper and lower pressure limits.       [0033]   When the spray gun 3 is closed, the compressed air tank 25 and the automatic
The compressed air pressure in the discharge pipe 4 up to the valve 8 is within the upper and lower limit pressure set by the pressure switch 31.
The compressed air in the discharge pipe 4 between the check valve 10 and the spray gun 3 is in a compressed air state.
When the detector 7 is a pressure switch, its set upper limit pressure (this pressure is
25 is equal to or less than the set upper limit pressure of the pressure switch 31). Also, compressed sky
When the air condition detector 7 is a flow switch, the set lower limit flow of the flow switch occurs.
Pressure at the flow switch position at the time of
(Pressure corresponding to the set upper limit pressure of the switch (7)).       [0034]   The discharge pipe 4 from the automatic valve 8 to the check valve 10 and the membrane air dryer 2
The inside is at atmospheric pressure because the exhaust port 2d of the membrane air dryer 2 is open.
ing.       [0035]   When the spray gun 3 is opened, the discharge pipe at the position of the compressed air condition detector 7
The compressed air in 4 flows toward the spray gun 3 and the compressed air pressure decreases, or This causes the compressed air condition detector 7 to connect the wiring 9 via a control device (not shown).
Then, the automatic valve 8 is opened. As a result, the compressed air in the compressed air tank 25 is discharged and distributed.
From the compressed air inlet 2a through the pipe 4, the open automatic valve 8, the membrane air
The fiber enters the dispersion chamber 36 of the plyer 2 and is dispersed into the hollow fibers 35 so that the hollow fibers 35 are gathered in the collecting chamber.
Proceed to 37. In the hollow fiber 35, only the steam S in the compressed air flows to the steam chamber 38.
It is extracted, becomes dry compressed air D, exits to the collecting chamber 37, merges in the collecting chamber 37, and is dried.
From the compressed air outlet 2b, it goes to the spray gun 3 through the discharge pipe 4. Membrane
Dry compressed air D flows from the middle of the discharge pipe 4 between the air dryer 2 and the spray gun 3.
A part is supplied to the steam chamber 38 through the purge air pipe 5 and the purge air inlet 2c.
You. At this time, a purge air flow control valve 6 interposed in the purge air pipe 5
The purge air flow is adjusted. The dry compressed air flowing into the steam chamber 38 is steam S
To reduce the degree of dryness and reduce the pressure, and then diffused into the atmosphere through the exhaust port 2d.
It is. It emits almost no matter other than water in addition to air
Since it is water vapor and does not generate drain, it is released as it is.       [0036]   The dry air discharged from the dry compressed air outlet 2b of the membrane air dryer 2 to the discharge pipe 4
Compressed air passes through a check valve 10 and a compressed air condition detector 7 and is sprayed from a spray gun 3.
Put out.       [0037]   When the ejection of the spray gun 3 is stopped, the discharge at the part of the compressed air condition detector 7 is performed.
The pressure of the compressed air in the pipe 4 passes from the compressed air tank 25 through the discharge pipe 4,
When the compressed air condition detector 7 is a pressure switch, the set upper limit pressure
And the flow stops if the compressed air condition detector 7 is a flow switch. This
Thereby, the automatic valve 8 is closed through the wiring 9 via a control device (not shown),
Since the flow of compressed air into the compressed air inlet 2a of the membrane air dryer 2 stops,
The exhaust from the exhaust port 2d of the membrane air dryer 2 is eliminated. The membrane
The inside of the air dryer 2 is at atmospheric pressure.       [0038]   When the compressed air is ejected from the spray gun 3 as described above, the automatic valve 8 opens. The compressed air is supplied to the spray gun 3 through the discharge pipe 4, and from the spray gun 3
When the ejection of the compressed air is stopped, the automatic valve 8 closes, and when the spray gun 3 is in the ejection state,
After being exhausted from the exhaust port 2d, the membrane air dryer 2 operates to operate the moisture in the compressed air.
Is removed, but when the spray gun is stopped, the exhaust from the exhaust port 2d stops.
The air compressor 1 is not operated unnecessarily.       [0039]   "Example 2"   According to the first embodiment, the discharge is stopped for a while after the ejection of the spray gun 3 is stopped.
The exhaust from the vent 2d continues, and the membrane air dryer 2 and the
The pressure of the compressed air in the discharge pipe 4 from the valve 8 to the check valve 10 has dropped.
State. Therefore, even if the spray gun 3 is jetted,
Sufficiently compressed into the discharge pipe 4 from the ear 2 and the automatic valve 8 connected thereto to the check valve 10
Until the air is supplied, compressed air of the required pressure cannot be obtained to spray gun 3 and spray
-There is little eruption from Gun 3. That is, a response is sent.       [0040]   Embodiment 2 is designed to improve this point.       [0041]   In FIG. 4, the same members as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.       [0042]   The compressed air discharge pipe 4 between the membrane air dryer 2 and the spray gun 3 is
In accordance with the flow of compressed air from the air dryer 2 to the spray gun 3,
An automatic valve 11 such as a valve or a solenoid valve, and an air tank 12 are interposed. Air tank 1
2, a pressure switch 13 is attached to the air tank 1.
When the upper limit pressure of the compressed air in the fuel cell 2 is detected, the automatic valve 8 is controlled via a control device (not shown).
, 11 are provided with wiring 14. In the above, the air tank 12
The capacity is smaller than the capacity of the compressed air tank 25. Of the pressure switch 13 of the air tank 12
The set upper limit pressure is higher than the set upper limit pressure of the pressure switch 31 of the air compressor 1.
If it is set smaller, the response to the stoppage of the ejection of the spray gun 3 becomes faster.       [0043]   When the spray gun 3 is in the jetting state, the valve is opened from the compressed air tank 25 through the discharge pipe 4.
Automatic valve 8, membrane air dryer 2, open automatic valve 11, air filter
Compressed air is sent to the spray gun 3 via the ink 12. Spray gun 3
When the injection of air is stopped, the compressed air in the air tank 12 increases the pressure and reaches the upper limit pressure.
Then, the pressure switch 13 outputs a signal and outputs the signal through a control device (not shown) and the wiring 14.
To close the automatic valves 8 and 11. This allows the compressed air tank 25 to remove the membrane air.
The supply of compressed air to the dryer 2 is stopped, and the purge air piping 5
The backflow of the compressed air in the direction no longer occurs.
The flow of the purge air that proceeds in the order of the inlet 2c, the steam chamber 38, and the exhaust port 2d will take some time.
And stop. In the membrane air dryer 2, the dispersion chamber 36 is formed by the hollow fibers 35.
To the collecting chamber 37, and the collecting chamber 37 is purged air piping (shared with some discharge piping 4).
Since it communicates with the steam chamber 38, the case of the membrane air dryer 2 is used.
The compressed air in the ring 34 is discharged from the exhaust port 2d, and reaches the atmospheric pressure.       [0044]   Next, when spraying of the spray gun 3 is started, the compressed air in the air tank 12 is sprayed.
The spray gun 3 is immediately sent to the spray gun 3 and starts spraying compressed air. And d
When the pressure of the compressed air in the tank 12 reaches the lower limit pressure of the pressure switch 13
, The automatic valves 8, 1 through the wiring 14 through a control device (not shown) according to the signal.
1 is opened. As a result, the compressed air in the compressed air tank 25 is sent out to the membrane.
The pressure in the dispersion chamber 36 of the run-air dryer 2, the inside of the hollow fiber 35, and the collecting chamber 37 increases.
The dry compressed air is partially diverted to the purge air pipe 5 as purge air,
The rest is supplied to the air tank 12.       [0045]   In the above, the opening of the automatic valves 8, 11 from the start of spraying of the spray gun 3 is advanced,
To reduce the capacity of the air tank 12, the pressure provided in the air tank 12 can be reduced.
It is preferable to set the lower limit pressure of the force switch 13 as large as possible. Pressure switch 1
As soon as the control device (not shown) to which the signal of No. 3 is sent receives this signal, the air
Compressed air is discharged through a discharge pipe 4 between the compressor 1 and the membrane air dryer 2.
Opening the automatic valve 8 and sending compressed air to the membrane air dryer 2 After the automatic valve 8 is opened, the air is dried by the timer with the membrane air dryer 2.
The automatic valve 11 interposed in the discharge pipe 4 between the tanks 12 is opened. Then, this
When the automatic valve 11 is opened, the membrane air dryer 2 has already started up.
The compressed air in the air tank 12 is supplied to the discharge pipe 4 just before the automatic valve 11.
Dry compressed air having a pressure higher than the pressure has reached, and the automatic valves 8 and 11 are
Compressed air flowing from air tank 12 to membrane air dryer 2 when valve is opened
Is prevented, and it is not necessary to increase the capacity of the air tank 12.       [0046]   According to this embodiment, the compressed air is ejected at the same time that the spray gun 3 starts ejecting.
This has the effect of continuing to erupt.       [0047]   "Example 3"   FIG. 5 shows a third embodiment.       [0048]   In this embodiment, compressed air is discharged between the membrane air dryer 2 and the spray gun 3.
A check valve 10 and an air tank 12 are interposed in this order in the pipe 4 in accordance with the flow of compressed air.
In the embodiment of FIG. 1, the discharge between the check valve 10 and the spray gun 3 is performed.
An air tank 12 is interposed in the pipe 4, and in the embodiment of FIG.
The automatic valve 11 between the valve 2 and the air tank 12 is replaced with a check valve 10.       [0049]   When the spraying of the spray gun 3 is stopped, the compressed air pressure in the air tank 12 rises.
When the pressure switch 13 detects the upper limit pressure, the pressure switch 13
The automatic valve 8 is closed via the wiring 9 via the device. Thereby, the compressed air tank 25
Compressed air from the air tank 12 is restricted by the automatic valve 8,
Since it is stopped by the stop valve 10, there is nothing from the exhaust port 2 d of the membrane air dryer 2.
There is no compressed air to blow out.       [0050]   When the spray gun 3 starts jetting, the compressed air in the air tank 12 is sprayed.
Immediately squirts from ン 3. Then, the compressed air pressure in the air tank 12 is lowered and When the pressure switch 13 detects the constant lower limit pressure, wiring is performed via a control device (not shown).
9, the automatic valve 8 is opened, and the compressed air in the compressed air tank 25 is supplied to the membrane air dryer.
The air is sent to the ear 2 and flows out from the dry air outlet 2b of the membrane air dryer 2.
The pressure of the dry compressed air is higher than the compressed air pressure in the air tank 12 at the check valve 10.
Is higher, the compressed air is supplied to the air tank 12.       [0051]   In this embodiment, only one automatic valve having the same effect as the previous embodiment 2 is required.
, The control device is simple.       [0052]   "Example 4"   FIG. 6 shows a fourth embodiment.       [0053]   This embodiment is different from Embodiment 2 in that the compressed air tank 25 is
The automatic valve 17 is connected to the discharge pipe 4 of the compressed air to the
A control device (not shown) connected to the exhaust port 2 d of the air
The automatic valves 11 and 17 are controlled by wiring 18 via a device.       [0054]   When the spray gun 3 is in the jetting state, the compressed air pressure in the air tank 12 is at the upper limit.
The pressure is below the pressure, the automatic valves 11 and 17 are open, and the compressed air in the compressed air tank 25 is
Flows into the membrane air dryer 2 and removes moisture with the membrane air dryer 2.
The dry compressed air that has been removed is supplied to the automatic valve 11 and the air tank 1 through the dry compressed air outlet 2b.
2 and is supplied to the spray gun 3 and is opened from the exhaust port 2d.
The steam is exhausted through the valve 17.       [0055]   When spraying of the spray gun 3 is stopped, the compressed air tank 2 is continuously supplied to the air tank 12.
Compressed air is sent from 5 through a membrane air dryer 2 and an automatic valve 11.
Therefore, the pressure of the compressed air in the air tank 12 rises, and the pressure switch 13
Is detected to be the set upper limit pressure, a wiring 18 is connected via a controller (not shown).
, The automatic valves 11 and 17 are closed. Thereby, the compressed air in the compressed air tank 25 is Air is not exhausted from the exhaust port 2d, and the air tank 12
Compressed air sent to the air compressor is shut off, so that the air compressor 1 is not operated unnecessarily.
No.       [0056]   When spraying of the spray gun 3 starts, the compressed air in the air tank 12 is immediately supplied.
The compressed air pressure in the air tank 12 falls, and the lower limit pressure is reduced by the pressure switch 13.
Upon detection, the automatic valves 11 and 17 are set via wiring 18 via a control device (not shown).
Open the valve. Therefore, the compressed air in the compressed air tank 25 is supplied to the membrane air dryer 2.
The compressed air is supplied to the air tank 12.       [0057]   In the above, an automatic valve 11 is provided between the membrane air dryer 2 and the air tank 12.
When the spray gun 3 starts jetting, compressed air is supplied to the air tank 12.
Since it is not replenished, the compressed air pressure in the air tank 12 drops relatively early,
From the start of injection of the playgun 3 until the pressure switch 13 detects the set lower limit pressure
The time is short, and therefore, from the start of spraying of the spray gun 3 to the opening of the automatic valves 11 and 17.
Air dryer 2 starts spray gun 3 spraying because the time in
Start the dewatering of the compressed air in a short time.       [0058]   "Example 5"   FIG. 7 shows a fifth embodiment.       [0059]   This embodiment is different from the embodiment 4 shown in FIG.
Automatic valve 8 is interposed in discharge pipe 4 between ear 2 and signal of pressure switch 13 is shown.
To each of the automatic valves 8, 11, and 17 via wiring 19 via a control device which is not
8, 11, and 17 are controlled.       [0060]   According to this embodiment, a failure occurs in which one of the automatic valves cannot be closed in the open state.
It is effective in the case of failure. That is, the failure of the automatic valve 8 is the same as that of the fourth embodiment shown in FIG.
. The failure of the automatic valve 17 is the same as that of the second embodiment in FIG. If the automatic valve 11 fails, The tank 34 of the tank 12 and the membrane air dryer 2 is a reservoir for compressed air.
Pressure tank 13 from the start of spray gun 3 ejection
Although the time until the force is detected becomes longer, the compressed air pressure in the air tank 12 becomes
The automatic valves 8, 11 are opened and the membrane air-dried due to the lower pressure limit.
Ya 2 stands up.       [0061]   "Example 6"   FIG. 8 shows a sixth embodiment.       [0062]   In this embodiment, a discharge pipe 4 between an air compressor 1 and a spray gun 3 is provided with a membrane.
Air dryer 2 and discharge between the membrane air dryer 2 and the spray gun 3.
For example, a pressure switch as a pressure sensor and a flow rate switch as a flow sensor
And a control device based on a signal detected by the detector 7.
Control the automatic valve 17 connected to the exhaust port 2d of the membrane air dryer 2 through the
The wiring 21 is arranged as follows.       [0063]   When the compressed air condition detector 7 is a pressure switch when the spray gun 3 is jetting
Indicates that the compressed air pressure at the position of the compressed air condition detector 7 is below the set upper limit pressure.
, The automatic valve 17 is opened, and the membrane air dryer 2 is opened from the compressed air tank 25.
The moisture in the supplied compressed air is removed and the dry compressed air is discharged from the dry compressed air outlet 2b.
Air to the spray gun 3 through the discharge pipe 4 and the supplied compressed air.
Air rich in water extracted from the air is discharged through the exhaust port 2d and the automatic valve 17.
.       [0064]   When the spraying of the spray gun 3 is stopped, the pressure switch provided as the compressed air condition detector 7 is stopped.
Since the compressed air pressure at the switch increases, the upper limit pressure
Upon detection, the automatic valve 17 is closed via a control device (not shown). Then spray
The outflow of compressed air to the outside of the air compressor is stopped by closing the gun 3 and the automatic valve 17.
You.       [0065]   When the spray gun 3 starts spraying, the compressed air pressure at the pressure switch (7) position
Since the force decreases, the pressure (not shown) is controlled when the compressed air condition detector 7 detects the pressure.
The automatic valve 17 is opened via the wiring 21 via the control device.       [0066]   In the above, when the compressed air condition detector 7 is the flow rate switch (7), the sprayer
When the flow of compressed air in the discharge pipe 4 provided with the flow rate switch (7)
When the spraying of the spray gun 3 is stopped, the flow in the discharge pipe 4 provided with the flow rate switch (7) is stopped.
Since the flow of the compressed air stops, the flow rate switch (7) is set to
When the flow is detected, the automatic valve 17 is opened.
The automatic valve 17 is closed.       [0067]   "Example 7" FIG. 9 shows a seventh embodiment.       [0068]   This embodiment is similar to the first embodiment shown in FIG.
The compressed air pressure or compressed air in the discharge pipe 4 flows into the discharge pipe 4 between the Reagans 3.
For example, a pressure switch as a pressure sensor to detect, or a flow switch as a flow sensor, for example.
The compressed air condition detector 7 such as a quantity switch is interposed, and the purge air piping 5
The air flow regulating valve 22 is provided with a blocking function, and a detector (not shown) is provided from the detector 7.
The wiring 21 is connected to this valve 22 via a device.       [0069]   When the detector 7 detects the upper limit pressure of the compressed air pressure in the discharge pipe 4,
Alternatively, it is detected that the flow of the compressed air in the discharge pipe 4 has become equal to or less than the lower limit flow rate.
In such a case, the detector 7 closes the purge air flow control valve 22.       [0070]   When spraying of spray gun 3 is stopped, spray gun from membrane air dryer 2
Compressed air in the discharge pipe 4 between the three stops flowing,
The pressure of the compressed air in the discharge pipe 4 that has been lowered rises. The compressed air condition detector 7 A control device (not shown) which detects a set upper limit pressure of compressed air or a lower limit flow rate of compressed air.
The purge air flow control valve 22 is closed through the wiring 21 via the. To be so
Then, the purge air pipe 5 is shut off, and the dry pressure flowing out from the dry compressed air outlet 2b.
Since compressed air does not flow into the steam chamber 38 of the membrane air dryer 2, the steam chamber
The steam in the steam 38 becomes saturated, and the mole fraction Y of the steam in the steam chamber 38 rises sharply.
Ascend. Here, the permeation gas flow rate Q of the water vapor of the hollow fiber membrane is           Q = P_i× A × (P1 × X-P2 × Y)   Where P_i : Water vapor transmission rate constant           A: Membrane area of hollow fiber 25           P1: compressed air pressure at the center hole of the hollow fiber 25           P2: gas pressure in the steam chamber 38           X: mole fraction of water vapor in the central hole of the hollow fiber 25 Therefore, the above P_i, A are constants and are hollow when the spray gun 3 is stopped.
Although the compressed air pressure P1 in the center hole of the yarn 35 rises,
The gas pressure changes substantially at atmospheric pressure, and the steam pressure is smaller than the compressed air pressure P1.
The increase rate of the water vapor mole fraction in 38 is the compressed air pressure in the center hole of the hollow fiber 35.
It is significantly smaller than the rate of increase of the force P1. Therefore, the permeated gas of water vapor of the hollow fiber membrane
The flow rate Q becomes smaller, and the hollow fiber membrane becomes oxygen O_TwoBecause it is difficult to pass nitrogen N
The exhaust from the air becomes extremely small.       [0071]   When spraying of the spray gun 3 is started, the compressed air at the position of the compressed air condition detector 7 is
The flow rate is adjusted via a control unit (not shown) because the pressure of
The valve 22 is opened, and the purge air is generated, so that the membrane air dryer 2 operates.
.       [0072]   "Example 8"   FIG. 10 shows Example 8.       [0073]   Embodiment 8 is a flow regulating valve with a stop valve function interposed in the purge air pipe 5 of Embodiment 7. In place of 22, the flow rate of a manual flow control valve or an orifice
The adjusting means 15 and the automatic valve 16 are interposed in series, and automatically operated by the signal of the compressed air condition detector 7.
That is, the valve 16 is controlled.       [0074]   The operation is the same as in the seventh embodiment.       [0075]   "Example 9"   FIG. 11 shows a ninth embodiment.       [0076]   The ninth embodiment is different from the eighth embodiment in that the flow rate adjusting means 15 is interposed in the purge air pipe 5.
Then, only the automatic valve 16 is interposed in the purge air pipe 5, and a membrane air dryer is provided.
The flow control means 20 such as a manual flow control valve or an orifice is connected to the exhaust port 2d of No. 2.
Things.       [0077]   The operation of this embodiment is the same as that of the first embodiment except that the purge air flow rate is adjusted by adjusting the exhaust flow rate.
This is the same as in the eighth embodiment.       [0078]   In the description of the embodiment, between the membrane air dryer and the spray gun of the pneumatic equipment
The operation of the flow rate sensor interposed in the discharge pipe is signaled as detecting a zero flow rate.
The operation is substantially different even if the flow rate is below a certain level, that is, the lower flow rate is detected.
Absent. That is, in the flow sensor, the range in which the L active signal changing from H to L is obtained is also higher.
It is the same as the flow rate of zero. That is, the case where the flow rate sensor indicates a small flow rate equivalent to zero is shown. Real
For practical use, a flow switch that outputs an L active signal at an extremely small lower flow rate or zero flow rate is used.
Suitable.       [0079]     【The invention's effect】   The first invention of the present invention is to supply compressed air from one end of a hollow fiber disposed in a casing.
The water in the compressed air is extracted through the hollow fiber membrane into the steam chamber surrounding the hollow fiber.
To obtain compressed air from which moisture was removed from the other end of the hollow fiber, and the moisture was removed. Part of the compressed air is sent to the steam chamber as purge air to remove the steam in the steam chamber.
The membrane air dryer, which is discharged from the exhaust port, is
An air compressor installed in the compressed air discharge piping between pneumatic devices that use compressed air
When the pneumatic equipment using compressed air is stopped, the purge air flows into the steam chamber.
Provision of a prompt prohibition means that only when the pneumatic equipment is operating,
When the pneumatic device is not operating, the air is not exhausted from the membrane air dryer.
When the pressure equipment is not operating, the compressor does not operate and uses compressed air unnecessarily.
It will not be consumed.       [0080]   According to a second aspect of the present invention, there is provided the air compressor and the membrane air according to the first aspect.
An automatic valve is installed in the compressed air discharge pipe between the dryers, and the membrane air dryer is installed.
Check valve in the direction of compressed air flow to the compressed air discharge pipe between the ear and pneumatic equipment,
A compressed air pressure sensor or flow sensor is provided.
The signal that detected the upper limit pressure or the signal that the flow sensor detected that the lower limit flow rate was reached.
A control device that closes the automatic valve with
Since the means for prohibiting inflow into the air chamber is used, the effect of the first invention can be achieved.       [0081]   According to a third aspect of the present invention, in the first aspect, the air compressor and the membrane air are provided.
An automatic valve is interposed in the compressed air discharge pipe between the dryers to
Automatic valve and air tank according to the flow of compressed air to the discharge pipe of compressed air between pneumatic equipment
And a pressure sensor in the air tank, and the compressed air in the air tank
Control for closing each of the automatic valves by a signal detected by the pressure sensor at the upper limit pressure
By providing a device to prevent the purge air from flowing into the steam chamber,
In addition to the effect of the first invention, compressed air is immediately released from the air tank when the pneumatic device is operated.
Since air is supplied to the pneumatic device, there is no delay in operation of the pneumatic device.       [0082]   According to a fourth aspect of the present invention, in the first aspect, the air compressor and the membrane air are provided.
An automatic valve is interposed in the compressed air discharge pipe between the dryers to
Membrane air dryer according to the flow of compressed air to the compressed air discharge pipe between pneumatic devices A check valve and an air tank that allow compressed air to flow only from the ear to the pneumatic equipment
A pressure sensor is installed in the air tank, and the upper limit pressure of the compressed air in the air tank is
A control device is provided for closing the automatic valve according to a signal detected by the pressure sensor.
Means for inhibiting the purge air from flowing into the steam chamber.
As soon as the pneumatic equipment is activated, compressed air is supplied from the air tank to the pneumatic equipment.
Since the power is supplied, there is no operation delay in the pneumatic equipment.       [0083]   According to a fifth aspect of the present invention, in the first aspect, the membrane air dryer and the pneumatic device are provided.
The automatic valve and the air tank are connected to the compressed air discharge pipe according to the flow of the compressed air.
Automatic valves are connected to the exhaust port of the steam chamber of the membrane air dryer in order.
A pressure sensor is provided in the air tank, and the upper limit pressure of the compressed air in the air tank is
A control device that closes each of the automatic valves according to the signal detected by the force sensor is installed and purged.
The effect of the first aspect of the present invention is achieved by using a means for inhibiting the flow of air into the steam chamber.
In addition, compressed air is supplied from the air tank to the pneumatic equipment as soon as the pneumatic equipment is activated.
Therefore, there is no operation delay in the pneumatic equipment. Also, during the membrane air dryer
Is compressed air pressure from the air compressor.
At the same time as opening the automatic valve connected to the exhaust port of the
Starting with water removal, pneumatic equipment operation and membrane air dryer work almost simultaneously.
Can move.       [0084]   According to a sixth aspect of the present invention, in the first aspect, the air compressor and the membrane compressor are provided.
An automatic valve is interposed in the compressed air discharge pipe between the dryers, and the membrane air dryer
Automatic valve and air tank according to the compressed air flow to the compressed air discharge pipe between
And an automatic valve at the exhaust port of the steam chamber of the membrane air dryer.
Then, install a pressure sensor in the air tank and measure the upper limit pressure of the compressed air in the air tank.
A control device for closing each of the above-mentioned automatic valves based on a signal detected by the pressure sensor of
The first and fifth aspects of the present invention include means for inhibiting the flow of air into the steam chamber.
Failure in which one of the above automatic valves remains open in addition to the effect of
The air dryer operates normally even when .       [0085]   According to a seventh aspect of the present invention, in the first aspect, the steam of the membrane air dryer is provided.
Connect an automatic valve to the exhaust port of the chamber and compress between the membrane air dryer and pneumatic equipment.
A pressure sensor or flow rate sensor is interposed in the air discharge pipe, and the pressure sensor is compressed air pressure.
The signal that detected the upper limit pressure of the force or the flow sensor detected that the lower limit flow rate was reached.
A control device for closing the automatic valve with a signal is provided to purge water of purge air.
In addition to the effect of the first invention, the means for inhibiting the inflow into the steam chamber is added.
Compressed air is always applied to the pneumatic equipment, and the compressed air is
Air is supplied to the pneumatic equipment and the membrane air dryer operates immediately.
Has the effect.       [0086]   According to an eighth aspect of the present invention, in the first aspect, the purge air is purged to the membrane air dryer.
A flow regulating valve with a valve closing function is interposed in the flow path for air
A pressure sensor or flow rate sensor is interposed in the compressed air discharge pipe between the ear and the pneumatic device,
The signal that the pressure sensor detects the upper limit pressure of the compressed air, or the flow sensor detects the lower limit flow rate
A control device for closing the flow regulating valve based on the detected signal is provided to purge air.
In addition to the effect of the first aspect, the means for inhibiting the inflow into the steam chamber is provided.
Compressed air pressure is applied to the pneumatic equipment, and the compressed air is
Air is supplied to the pneumatic equipment and the membrane air dryer is activated immediately. or
, The steam chamber of the membrane air dryer is always kept at a low pressure.
It is easy to adjust the water removal capacity of the dryer.       [0087]   The ninth invention of the present invention relates to a flow path for feeding purge air to a membrane air dryer.
Automatic valve and flow control means are interposed in series, and the membrane air dryer and pneumatic
A pressure sensor or flow rate sensor is interposed in the discharge pipe of compressed air between
Is the signal that the upper limit pressure of the compressed air is detected, or the signal that the flow rate sensor detects the lower limit flow rate.
A control device is provided to close the automatic valve with a signal so that the purge air flows into the steam chamber.
In addition to the effects of the first invention, the pneumatic device has Compressed air pressure is constantly being applied, and compressed air is immediately
And the membrane air dryer is activated immediately.
You.       [0088]   According to a tenth aspect of the present invention, a flow rate is regulated at an exhaust port of a steam chamber of a membrane air dryer.
Control valve, an automatic valve in the purge air piping, and a membrane air dryer.
A pressure sensor or flow rate sensor is interposed in the compressed air discharge pipe between the
A signal indicating that the sensor has detected the upper limit of the compressed air pressure
A control device that closes the automatic valve in response to a signal indicating that the
Means to prevent the purge air from flowing into the steam chamber.
In addition to the light effect, pneumatic equipment is always under compressed air pressure,
As soon as it moves, compressed air is supplied to the pneumatic equipment and the membrane air dryer
Has the effect of operating immediately.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow sheet of Example 1 of the present invention. FIG. 2 is a longitudinal sectional view of a membrane air dryer. FIG. 3 is a perspective view showing the operation of a hollow fiber. FIG. 4 is a flow sheet according to a second embodiment of the present invention. FIG. 5 is a flow sheet according to a third embodiment of the present invention. FIG. 6 is a flow sheet of Example 4 of the present invention. FIG. 7 is a flow sheet according to a fifth embodiment of the present invention. FIG. 8 is a flow sheet of Example 6 of the present invention. FIG. 9 is a flow sheet of Example 7 of the present invention. FIG. 10 is a flow sheet of Example 8 of the present invention. FIG. 11 is a flow sheet according to a ninth embodiment of the present invention. FIG. 12 is a flow sheet of a conventional example. [Description of Signs] 1 Air compressor 2 Membrane air dryer 3 Spray gun 4 Discharge pipe 5 Purge air pipe 6 Purge air flow control valve 7 Compressed air condition detector 8 Automatic valve 10 Check valve 11 Automatic valve 12 Air tank 13 Pressure switch 15 Flow rate Control valve 16, 17 Automatic valve 22 Flow control valve 25 Compressed air tank 35 Hollow fiber 36 Dispersion chamber 37 Collecting chamber 38 Steam chamber

Claims (1)

Claims: 1. Compressed air is sent from one end of a hollow fiber disposed in a casing, and moisture in the compressed air is extracted to a steam chamber surrounding the hollow fiber through a hollow fiber membrane. A compressed air from which moisture is removed is obtained from the other end of the membrane, and a part of the compressed air from which moisture is removed is sent to a steam chamber as purge air to discharge steam in the steam chamber from an exhaust port. In an air compressor in which an air dryer is interposed in a discharge pipe of compressed air between an air compressor and a pneumatic device using compressed air,
Measures must be taken to immediately prevent the purge air from flowing into the steam chamber when the pneumatic equipment that uses compressed air is stopped, by providing compressed air between the air compressor and the membrane air dryer.
An air compressor characterized by being provided in a discharge pipe or in connection with an exhaust port of a steam chamber of a membrane air dryer . 2. An automatic valve is interposed in a compressed air discharge pipe between an air compressor and a membrane air dryer, and a reverse valve is sequentially provided in a compressed air flow direction in a compressed air discharge pipe between the membrane air dryer and a pneumatic device. A compressed air pressure sensor or a flow rate sensor, the pressure sensor detects the upper limit of the compressed air pressure signal,
Alternatively, there is provided a control device that closes the automatic valve based on a signal that the flow rate sensor detects that the flow rate has reached the lower limit flow rate, and a means for inhibiting the flow of purge air into the steam chamber. The air compressor according to claim 1. 3. An automatic valve is interposed in a compressed air discharge pipe between the air compressor and the membrane air dryer, and the automatic valve and the air tank are connected to the compressed air discharge pipe between the membrane air dryer and the pneumatic device in accordance with the flow of the compressed air. In this order, a pressure sensor is provided in the air tank, and a control device that closes each of the automatic valves according to a signal detected by the pressure sensor detects the upper limit pressure of the compressed air in the air tank. 2. The air compression device according to claim 1, wherein the air compression device is configured to inhibit the inflow. 4. An automatic valve is interposed in a discharge pipe of compressed air between the air compressor and the membrane air dryer, and the compressed air discharge pipe between the membrane air dryer and the pneumatic device is supplied from the membrane air dryer to the pneumatic device in accordance with the flow of the compressed air. A check valve capable of flowing compressed air only toward and an air tank are interposed in this order, a pressure sensor is provided in the air tank, and the upper limit pressure of the compressed air in the air tank is detected by the pressure sensor. 2. The air compressor according to claim 1, wherein a control device for closing the valve is provided to prohibit purge air from flowing into the steam chamber. 5. An automatic valve and an air tank are interposed in this order in accordance with a flow of compressed air in a compressed air discharge pipe between a membrane air dryer and a pneumatic device, and an automatic valve is connected to an exhaust port of a steam chamber of the membrane air dryer. Means for providing a pressure sensor in the air tank, providing a control device for closing the automatic valves by a signal detected by the pressure sensor to detect the upper limit pressure of the compressed air in the air tank, and prohibiting inflow of purge air into the steam chamber. The air compressor according to claim 1, wherein: 6. An automatic valve is interposed in a compressed air discharge pipe between the air compressor and the membrane air dryer, and the automatic valve and the air tank are connected to the compressed air discharge pipe between the membrane air dryer and the pneumatic device in accordance with the flow of the compressed air. In this order, an automatic valve is connected to the exhaust port of the steam chamber of the membrane air dryer, a pressure sensor is provided in the air tank, and the upper limit pressure of the compressed air in the air tank is closed by the signal detected by the pressure sensor. 2. The air compressor according to claim 1, further comprising a control device for controlling a valve to prevent the purge air from flowing into the steam chamber. 7. An automatic valve is connected to an exhaust port of a steam chamber of a membrane air dryer, and a pressure sensor or a flow rate sensor is interposed in a discharge pipe of compressed air between the membrane air dryer and a pneumatic device. Means for prohibiting inflow of purge air into the steam chamber by providing a control device that closes the automatic valve with a signal that has detected the upper limit pressure of the above or a signal that has detected that the flow rate sensor has reached the lower limit flow rate. The air compressor according to claim 1, wherein: