JP2958427B1 - Separation membrane type gas generator - Google Patents

Abstract

An object of the present invention is to provide a separation membrane type gas generator provided with a dew condensation prevention device which prevents dew condensation on the inner wall of a gas separation membrane and is inexpensive and capable of reducing both volume and weight. A high-temperature and high-pressure compressed air discharged from an air compressor driven by an air compressor driving motor is supplied to a compressed air tank, a compressed air cooling condenser, and a mist dust via a pipe immediately after the air compressor. In a separation membrane gas generator that concentrates and separates a specific gas from the atmosphere by passing through a filter, a pipe immediately before the separation membrane, and a gas separation membrane, a heat exchange device is provided between the pipe immediately before the separation membrane and the pipe immediately after the air compressor,
A three-way solenoid valve is provided between the compressed air tank and the compressed air cooling condenser, and a temperature detection device is provided in the piping immediately after the air compressor. Can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a separation membrane type gas generator for concentrating and separating a specific gas from the atmosphere by a gas separation membrane.

[0002]

2. Description of the Related Art A conventional separation membrane type gas generator will be described with reference to the drawings. FIG. 8 is a configuration diagram of a conventional separation-membrane-type gas generator, and FIG. 9 is a diagram showing changes in the temperature and humidity of compressed air inside each component of FIG. The horizontal axis represents the components arranged in the order in which the compressed air discharged from the air compressor passes, and the vertical axis represents the temperature change and humidity change of the compressed air inside each component.

In FIGS. 8 and 9, compressed air discharged from an air compressor 2 driven by an air compressor driving motor 1 is heated at a high temperature because the air compressor 2 performs polytropic compression close to adiabatic compression. Moreover, the humidity is high due to the high pressure. This high-temperature and high-pressure compressed air enters the compressed air tank 4 through the pipe 3 immediately after the air compressor.
At this time, the temperature is lowered due to the expansion, the humidity becomes 100%, and dew condensation occurs. The compressed air passes through the compressed air tank 4 and the compressed air cooling condenser 6 with the humidity kept at 100%, and further drops in temperature to form dew condensation, and the water is accumulated in the mist / dust filter 7. At this time, the compressed air temperature was slightly higher but almost equal to the ambient temperature, and the humidity was 10
0%.

On the other hand, by supplying compressed air to the gas separation membrane 9, gas having a high permeation rate permeates through the separation membrane, and only gas having a low permeation rate reaches the outlet. This makes it possible to separate only gas having a low permeation rate through the membrane. However, since the compressed air supplied to the gas separation membrane 9 contains moisture, the gas separation membrane 9
Condensation on the inner wall. This condensation significantly impairs the permeation performance of the gas separation membrane 9 and shortens its life. For this reason, usually, a refrigeration dryer 18 is disposed immediately before the gas separation membrane 9, and compressed air whose humidity is significantly reduced is supplied to the gas separation membrane 9, so that dew condensation on the inner wall of the gas separation membrane 9 is prevented. Preventing.

When the gas generator is started, the refrigeration dryer 18 is not operating normally yet, so that the air compressor 2 is not operated, and the refrigerant temperature of the refrigeration dryer 18 is sufficient to dehumidify the compressed air. The temperature detector 19 detects that the temperature has dropped, and the motor 1 for driving the air compressor is started by the air compressor start switch 20, and the air compressor 2 is operated to separate the compressed air whose humidity has been reduced to gas separation. The supply to the membrane 9 prevents dew condensation on the inner wall of the gas separation membrane 9 when the gas generator is started.

[0006]

However, since the above-mentioned refrigeration dryer 18 is composed of a refrigeration compressor, a condenser, a refrigerant pipe, a heat exchanger, a condensed water separator, etc., it is expensive and has a large volume and weight. In particular, for a compressor having a small capacity, the refrigeration dryer 18 has a large ratio to the price and the total weight, and there are problems in various fields such as sales and inventory management, transportation and installation.

The present invention (corresponding to claims 1 to 6) provides:
In view of the above circumstances, it is an object of the present invention to provide a separation membrane type gas generator provided with a dew condensation prevention device which can prevent dew condensation on the inner wall of a gas separation membrane, and which is inexpensive and can be reduced in both volume and weight. Is to provide.

[0008]

In order to achieve the above-mentioned object, a first aspect of the present invention is to provide a high-temperature high-pressure compressed air discharged from an air compressor driven by an air compressor driving motor. A separation membrane gas generator that concentrates and separates a specific gas from the atmosphere by passing through a tank immediately after the compressor, a tank for compressed air, a condenser for cooling compressed air, a filter for mist and dust, a pipe just before the separation membrane, and a gas separation membrane. A heat exchange device between the pipe immediately before the separation membrane and the pipe immediately after the air compressor, and a three-way solenoid valve between the compressed air tank and the compressed air cooling condenser, respectively, and the air compressor It is characterized in that a temperature detecting device is provided in the pipe immediately after.

According to a second aspect of the present invention, in the separation membrane type gas generator according to the first aspect, the heat exchange device is provided between the pipe immediately before the separation membrane and the compressed air tank and the temperature detection is performed. The apparatus is provided in the compressed air tank.

According to a third aspect of the present invention, in the separation membrane type gas generator according to the first aspect, the heat exchange device is provided between the pipe immediately before the separation membrane and the motor for driving the air compressor. The temperature detecting device is provided on an outer shell of the air compressor driving motor.

According to a fourth aspect of the present invention, there is provided the separation membrane type gas generator according to the first to third aspects, wherein a three-way solenoid valve is opened.
A bimetal functioning as a changeover switch is provided on one of the pipe immediately after the air compressor, the tank for compressed air, and the outer shell of the motor for driving the air compressor.

According to a fifth aspect of the present invention, in the separation membrane type gas generator according to any one of the first to third aspects, a timer is provided at an input portion of the three-way solenoid valve changeover switch.

According to a sixth aspect of the present invention, in the separation membrane type gas generator according to any one of the first to third aspects, a pressure switch is provided for the compressed air tank, and a three-way solenoid valve changeover switch is provided for the three-way solenoid valve. A pressure switch switching frequency detecting device is provided between the pressure switch and the three-way solenoid valve changeover switch.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a diagram showing the change in the temperature and humidity of compressed air inside each component part in FIG. 1, and the horizontal axis indicates the passage of the compressed air discharged from the air compressor. The vertical axis represents the temperature change and the humidity change of the compressed air inside each of the components.

In FIG. 1, a motor 1 for driving an air compressor is shown.
The compressed air discharged by the air compressor 2 driven by the compressor is connected to a pipe 3 immediately after the air compressor, a tank 4 for compressed air,
Three-way solenoid valve 5, Compressed air cooling condenser 6, Mist
The gas is supplied to the gas separation membrane 9 through the dust filter 7 and the pipe 8 immediately before the separation membrane. A heat exchange device 10a is provided between the pipe 3 immediately after the air compressor and the pipe 8 just before the separation membrane. The three-way solenoid valve changeover switch 11 is configured to interlock with a temperature detection device 12 that detects the temperature of the pipe 3 immediately after the air compressor. The heat exchange device 10a is of the same order as a heat exchanger, which is one of the components of a conventional refrigeration dryer.
Compared to refrigeration dryers, it is cheaper and lighter in both volume and weight.

Next, the operation of this embodiment will be described.
1 and 2, the compressed air discharged from the air compressor 2 driven by the air compressor driving motor 1 has a high temperature and a high pressure because the air compressor 2 performs polytropic compression close to adiabatic compression. The humidity is also high. The high-temperature and high-pressure compressed air enters the compressed air tank 4 through the pipe 3 immediately after the air compressor, but expands at this time, so that the temperature decreases and the humidity becomes 100% and dew condensation occurs. When the compressed air passes through the compressed air tank 4, the three-way solenoid valve 5 and the compressed air cooling condenser 6 with the humidity kept at 100%, the temperature further decreases and dew condensation occurs, and the moisture is accumulated in the mist / dust filter 7. At this time, the compressed air temperature was slightly higher but almost equal to the ambient temperature, and the humidity was 10
0%. After that, the compressed air that has entered the pipe 8 immediately before the separation membrane receives heat due to heat exchange performed by the heat exchange device 10a installed between the pipe 3 immediately after the air compressor and the pipe 8 immediately before the separation membrane, and the temperature rises. I do. The dew point of the compressed air is the temperature immediately before rising, and the humidity is below 100%. When the high-temperature, low-humidity compressed air passes through the inside of the gas separation membrane 9, there is a slight temperature decrease and a rise in humidity. To prevent dew condensation. Also, since the pipe 3 immediately after the air compressor sets the temperature required for raising the compressed air in the pipe 8 immediately before the separation membrane to the required temperature via the heat exchange device 10a in the temperature detection device 12, the temperature detection device 12 is used. At the time of startup, the outlet of the three-way solenoid valve 5 is set to the exhaust port 5b until the temperature detection device 12 operates, so that the compressed air can be prevented from being supplied into the gas separation membrane 9 up to the set temperature. The temperature detecting device 12 operates to electrically switch the three-way solenoid valve changeover switch 11 and switch the outlet of the three-way solenoid valve 5 to the separation membrane supply port 5a to supply the compressed air having the required temperature to the gas separation membrane 9. This can prevent dew condensation on the inner wall of the separation membrane 9 when the apparatus is started. Therefore, it is possible to prevent dew condensation on the inner wall of the separation membrane 9 both at the time of start-up and during normal operation, and to provide a separation membrane type gas generator provided with a dew condensation prevention device which is inexpensive and can be reduced in both volume and weight.

FIG. 3 is a configuration diagram of a separation membrane type gas generator according to a second embodiment (corresponding to claim 2) of the present invention. As shown in the figure, in this embodiment, a heat exchange device 10b is installed between the compressed air tank 4 and the pipe 8 immediately before the separation membrane, and the three-way solenoid valve changeover switch 11 is connected to the compressed air tank 4
In conjunction with the temperature detection device 12 which detects the temperature of Further, the heat exchange device 10b is substantially the same as a heat exchanger which is one of the components of the refrigeration dryer 18. The other configuration is the same as that of the first embodiment, and the same components will be described with the same reference numerals.

Next, the operation of the present embodiment will be described.
The compressed air that has entered the pipe 8 immediately before the separation membrane receives heat from heat exchange performed by the heat exchange device 10b installed between the compressed air tank 4 and the pipe 8 immediately before the separation membrane, and the temperature rises. The temperature required for the compressed air tank 4 to raise the temperature of the compressed air in the pipe 8 immediately before the separation membrane to the required temperature via the heat exchange device 10b is set in the temperature detection device 12.
Therefore, the present embodiment also provides the same operation as the first embodiment, so that the dew condensation on the inner wall of the separation membrane can be prevented, and the separation membrane provided with the dew condensation prevention device which is inexpensive and can reduce both the volume and the weight. A type gas generator can be provided.

FIG. 4 is a configuration diagram of a separation membrane type gas generator according to a third embodiment (corresponding to claim 3) of the present invention. As shown in the figure, in this embodiment, a heat exchanger device 10c is provided between the outer shell of the motor 1 for driving the air compressor and the pipe 8 immediately before the separation membrane, and the three-way solenoid valve changeover switch 11 is It is linked to a temperature detecting device 12 which detects the outer shell temperature of the compressor driving motor 1. Further, the heat exchange device 10c is substantially the same as a heat exchanger which is one of the components of the refrigeration dryer 18. The other configuration is the same as that of the first embodiment, and the same components will be described with the same reference numerals.

In this embodiment, the compressed air that has entered the pipe 8 immediately before the separation membrane is connected to the outer shell of the motor 1 for driving the air compressor, which has become hot due to the air compressor drive load, and the pipe 8 just before the separation membrane. The temperature rises due to the heat from the heat exchange performed by the heat exchange device 10c installed therebetween. The temperature required for the outer shell of the motor 1 for driving the air compressor to raise the temperature of the compressed air in the pipe 8 immediately before the separation membrane to the required temperature via the heat exchange device 10c is set in the temperature detection device 12. I have. Therefore, the present embodiment also provides the same operation as the first embodiment, so that the dew condensation on the inner wall of the separation membrane can be prevented, and the separation membrane provided with the dew condensation prevention device which is inexpensive and can reduce both the volume and the weight. A method gas generator can be provided.

FIG. 5 is a block diagram of a separation membrane type gas generator according to a fourth embodiment (corresponding to claim 4) of the present invention. As shown in the figure, the present embodiment employs a pipe 3 immediately after an air compressor, a tank 4 for compressed air, or a motor 1 for driving an air compressor.
The outer shell of the heat exchanger 13 is referred to as a heat source 13 . The bimetal switch 14 is close to the heat source 13 and the bimetal switch 14 itself is a three-way solenoid valve switch. Other configurations are the same as those of the first to third embodiments, and the same components will be described with the same reference numerals.

In the present embodiment, the heat source 13
Through the heat exchanger 10a or 10b or 10c
The bimetal switch 14 is set to operate at a temperature required to raise the temperature of the compressed air to the required temperature, so that the present embodiment also provides the same operation as the first embodiment. Therefore, it is possible to prevent dew condensation on the inner wall of the separation membrane, and to provide a separation membrane type gas generator provided with a dew condensation prevention device which is inexpensive and can be reduced in both volume and weight.

FIG. 6 is a block diagram of a separation membrane type gas generator according to a fifth embodiment (corresponding to claim 5) of the present invention. As shown in the figure, in the present embodiment, the three-way solenoid valve 5
Reference numeral 5 denotes a three-way solenoid valve changeover switch 11 provided at the input section, which allows switching between the separation membrane supply port 5a and the exhaust port 5b. Other configurations are the same as those of the fourth embodiment, and are the same. Parts will be described with the same reference numerals.

In this embodiment, when the apparatus is started, the heat source 13 of the heat exchange apparatus is turned on by the heat exchange apparatus 10a or 10b or
It takes a certain period of time to raise the temperature of the compressed air to the required temperature via 10c.
Therefore, by setting the outlet of the three-way solenoid valve 5 to the exhaust port 5b until the timer 15 operates, compressed air can be prevented from being supplied into the gas separation membrane 9 until the set time. The timer 15 operates to electrically switch the three-way solenoid valve changeover switch 11, and the three-way solenoid valve 5
In this embodiment, the same effect as that of the fourth embodiment can be obtained by switching the outlet to the separation membrane supply port 5a and supplying compressed air to the gas separation membrane 9, so that the volume and weight can be reduced at low cost. It is possible to provide a separation membrane type gas generator provided with a dew condensation preventing device.

FIG. 7 is a configuration diagram of a separation membrane type gas generator according to a sixth embodiment (corresponding to claim 6) of the present invention. As shown in the figure, in this embodiment, a pressure switch 16 is provided in the compressed air tank 4, and a pressure switch switching frequency detecting device 17 is provided in the pressure switch 16.
Further, the three-way solenoid valve changeover switch 11 is interlocked with the pressure switch changeover number detecting device 17, and the other structure is the same as that of the fifth embodiment, and the same components are denoted by the same reference numerals. explain.

In the figure, a pressure switch 16 is used to maintain the pressure in the compressed air tank 4 within a certain range.
This switch is an N-OFF switch. When the pressure drops and reaches a set minimum pressure, the switch is turned on and the air compressor 2 starts operating. When the pressure rises and reaches a set maximum pressure, the switch is turned off and the air compressor 2 is turned off. 2 stops operation. Further, at the time of startup, the heat source 13 of the heat exchange device
A certain period of time is required to raise the temperature of the compressed air to the required temperature via 10b or 10c. The required time at this time is converted into the number of pressure switch switching times and set in the pressure switch switching frequency detecting device 17. By doing so, the present embodiment can provide the same operation as the fifth embodiment. Therefore, according to the present embodiment, it is possible to provide a separation membrane type gas generator provided with a dew condensation prevention device that can prevent dew condensation on the inner wall of the separation membrane and that can be reduced in cost and volume and weight.

[0027]

As described above, the present invention (Claim 1)
According to the sixth aspect of the present invention, it is possible to provide a separation membrane type gas generator provided with a dew condensation prevention device which can prevent dew condensation on the inner wall of the gas separation membrane and can be reduced in cost and volume and weight. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a separation membrane type gas generator according to a first embodiment of the present invention.

FIG. 2 is a measurement diagram showing the compressed air passage components in the pipe of FIG. 1 and the measurement results of temperature and humidity.

FIG. 3 is a configuration diagram of a separation membrane type gas generator according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a separation membrane type gas generator according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a separation membrane type gas generator according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of a separation membrane type gas generator according to a fifth embodiment of the present invention.

FIG. 7 is a configuration diagram of a separation membrane type gas generator according to a sixth embodiment of the present invention.

FIG. 8 is a configuration diagram of a conventional separation membrane type gas generator.

FIG. 9 is a measurement diagram showing a measurement result of temperature and humidity of compressed air in the pipe of FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motor for driving an air compressor, 2 ... Air compressor, 3 ... Piping immediately after the air compressor, 4 ... Compressor tank, 5 ... 3-way solenoid valve, 5a ... 3-way solenoid valve separation membrane supply port, 5b ... 3-way solenoid Valve exhaust port, 6… Compressed air cooling condenser, 7…
Mist / dust filter, 8… Pipe just before separation membrane, 9…
Gas separation membrane, 10a, 10b, 10c ... heat exchange device, 1
DESCRIPTION OF SYMBOLS 1 ... Three-way solenoid valve changeover switch, 12 ... Temperature detection device, 1
3 heat exchanger heat source, 14 bimetal switch, 15
... Timer, 16 ... Pressure switch, 17 ... Pressure switch switching frequency detector, 18 ... Refrigeration dryer, 19 ... Temperature detector, 20 ... Air compressor start switch.

Claims (6)

(57) [Claims] 1. A high-temperature, high-pressure compressed air discharged from an air compressor driven by an air compressor drive motor,
Separation membrane gas generator that concentrates and separates a specific gas from the atmosphere by passing through a tank immediately after the air compressor, a tank for compressed air, a condenser for cooling compressed air, a filter for mist and dust, a pipe just before the separation membrane, and a gas separation membrane. In the above, a heat exchange device is provided between the pipe immediately before the separation membrane and the pipe immediately after the air compressor, and a three-way solenoid valve is provided between the compressed air tank and the compressed air cooling condenser. A separation membrane type gas generator characterized in that a temperature detection device is provided in piping immediately after the machine. 2. The separation membrane type gas generator according to claim 1, wherein the heat exchange device is provided between the pipe immediately before the separation membrane and the compressed air tank, and the temperature detection device is used for the compressed air. A separation membrane type gas generator provided in a tank. 3. The separation membrane type gas generator according to claim 1, wherein the heat exchange device is provided between the pipe immediately before the separation membrane and the motor for driving the air compressor, and the temperature detection device is provided with the air. A separation membrane type gas generator provided on an outer shell of a motor for driving a compressor. 4. A separation membrane type gas generator according to claim 1, wherein said gas generator operates as a three-way solenoid valve changeover switch.
Ku bimetal, the air compressor after the pipe, the compressed air tank or separation membrane-type gas generator, characterized in that provided on one of said air compressor driving motor shell. 5. The separation membrane gas generator according to claim 1, wherein a timer is provided at an input portion of the three-way solenoid valve changeover switch. 6. The separation membrane gas generator according to claim 1, wherein a pressure switch is provided in the compressed air tank, a three-way solenoid valve changeover switch is provided in the three-way solenoid valve, and the pressure switch and the three-way solenoid valve are connected to each other. A separation membrane type gas generator, wherein a pressure switch switching frequency detecting device is provided between the pressure sensor and the three-way solenoid valve switching switch.