JP2015043787A - Oxygen concentrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oxygen concentrator capable of preventing the efficiency of oxygen concentration from worsening.SOLUTION: An oxygen concentrator 1 includes: a dehumidification mechanism 11a for dehumidifying air AIR taken in from outside; a compressor 12 disposed on the downstream of the dehumidification mechanism 11a for compressing the air AIR dehumidified with the dehumidification mechanism 11a; a nitrogen adsorption mechanism 13 for generating a high concentration oxygen OXY by making nitrogen contained in the air AIR compressed by the compressor 11 to be adsorbed by a catalyst; and a humidification mechanism 11b for humidifying the high concentration oxygen OXY generated by the nitrogen adsorption mechanism 13 before discharging it to the outside. The dehumidification mechanism 11a and the humidification mechanism 11b are integrated by allowing a water permeable film 11c to partition between the air AIR taken in from the outside and the high concentration oxygen OXY generated by the nitrogen adsorption mechanism 13, so that a moisture of the air AIR in the dehumidification mechanism 11a is transported to the high concentration oxygen OXY of the humidification mechanism 11b through the film 11c.

Description

  The present invention relates to an oxygen concentrator.

  There are many patients who need to be supplemented with oxygen at home, represented by patients with respiratory failure. For this reason, oxygen concentrators that increase the concentration of oxygen by concentrating air taken from outside have been developed as devices for supplying oxygen to patients. The oxygen concentrator generates high-concentration oxygen by bringing compressed air into contact with zeolite and causing the zeolite to adsorb nitrogen (see, for example, Patent Document 1).

JP 2010-227517 A

  Zeolite adsorbs not only nitrogen but also moisture. When moisture is adsorbed, the amount of nitrogen that can be adsorbed decreases and the efficiency of concentrating oxygen deteriorates. Such a problem is not limited to zeolite, but is common to catalysts that adsorb nitrogen.

  This invention is made | formed in view of the said subject, and it aims at providing the oxygen concentrator which prevented that the efficiency which concentrates oxygen deteriorates.

  (1) The present invention provides a dehumidifying mechanism that dehumidifies air taken from outside, a compressor that is provided downstream of the dehumidifying mechanism, compresses the air dehumidified by the dehumidifying mechanism, and is compressed by the compressor. A nitrogen adsorption mechanism that adsorbs nitrogen contained in the air to the catalyst to generate high-concentration oxygen, and a humidification mechanism that humidifies the high-concentration oxygen generated by the nitrogen adsorption mechanism before being sent outside. The dehumidifying mechanism and the humidifying mechanism are integrated by partitioning the air taken from the outside and the high-concentration oxygen generated by the nitrogen adsorption mechanism with a water-permeable film. In the oxygen concentrator, the moisture of the air of the dehumidifying mechanism is moved to the high-concentration oxygen of the humidifying mechanism through the membrane.

  According to the present invention, since the air taken in from the outside is dehumidified and then reacted with the catalyst, the amount of moisture that the catalyst unnecessarily adsorbs can be reduced. Thereby, the function of the catalyst is not lowered, and the efficiency of concentrating oxygen can be prevented from deteriorating by maintaining the amount of nitrogen that can be adsorbed by the catalyst. The catalyst that adsorbs nitrogen contained in the air also adsorbs moisture, and examples thereof include zeolite.

  By the way, in the case of a structure that dehumidifies after compressing air taken from outside, high-pressure air affects the film. As a result, a failure such as a hole opening due to deterioration of the membrane may occur, and the air taken in from outside and compressed may be sent out through the hole as it is. If a failure occurs during use, high-concentration oxygen that should be sent to the outside cannot be sent to the outside, which may lead to an accident involving human life.

  On the other hand, according to the present invention, the air taken in from the outside is dehumidified before being compressed, and the force exerted on the film by the air taken in from the outside can be reduced. For this reason, it is possible to prevent a failure such as a hole being opened due to deterioration of the film. If no failure occurs, there is no risk of an accident involving human life.

  And since the structure which moves a water | moisture content between the air taken in from the outside and the high concentration oxygen sent out outside is employ | adopted, dehumidification and humidification can be performed by a series of flows. Thereby, the structure which discharges | emits the water | moisture content obtained by dehumidification of air can be omitted. Further, it is possible to omit a structure for storing or supplying moisture for humidifying high concentration oxygen. As a result, the oxygen concentrator can be reduced in size and simplified.

  In addition, since the compressor is arranged downstream of the dehumidifying mechanism and the compressor pulls air from the outside, the speed of the air flowing through the dehumidifying mechanism is increased to make the air flow turbulent. can do. That is, the air flowing through the dehumidifying mechanism can be sufficiently stirred. Thereby, the volume per hour of the air which contacts a film | membrane can be increased, and the humidification of the high concentration oxygen of the other side of a film | membrane can be accelerated | stimulated. That is, the amount of moisture transferred from the air taken in from the outside to the high concentration oxygen on the opposite side of the membrane can be increased. As a result, dehumidification of the air taken in from the outside can be promoted.

  (2) In the present invention, the membrane has a shape in which a plurality of tubes are bundled, and one of the air taken in from the outside and the high-concentration oxygen generated by the nitrogen adsorption mechanism is the The oxygen concentrator according to (1) above, characterized in that it passes through the inside of the plurality of tubes and the other passes through the outside of the plurality of tubes.

  According to the said invention, the area of the film | membrane per unit space can be expanded. Thereby, the volume amount which contacts the film | membrane of the air taken in from the outside can be increased. Moreover, the volume amount which contacts the film | membrane of the high concentration oxygen sent out outside can be increased.

  And when the several tube formed with a film | membrane is thin, a film thickness becomes thin, and intensity | strength may be weak compared with the case where a film | membrane is made into a plane. However, it adopts a structure that dehumidifies before compressing the air taken in from the outside, and the force exerted on the membrane by the air taken in from the outside is small, so even if the strength of the membrane is weak The effect of is less.

  (3) The present invention is also characterized in that the air taken in from the outside passes through the outside of the plurality of tubes, and the high-concentration oxygen generated by a nitrogen adsorption mechanism passes through the inside of the plurality of tubes. The oxygen concentrator according to (2) above.

  Since the volume of oxygen in the air is about one-fifth of the whole, the volume of air taken in from the outside needs to be about five times the volume of high-concentration oxygen sent out to the outside. For this reason, according to the said invention, the air taken in from the outside with a relatively large volume can pass the outer side of a some tube. In addition, high concentration oxygen with a relatively small volume delivered to the outside can be passed through the inside of the plurality of tubes. For this reason, a tube can be made thin. As a result, the number of tubes can be increased. As a result, the area of the film per unit space can be increased.

  (4) The present invention is also the oxygen concentrator according to any one of (1) to (3) above, wherein the membrane is a non-porous membrane.

  (5) The present invention is also the oxygen concentrator according to any one of (1) to (4) above, wherein the membrane is Nafion (registered trademark) or Flemion (registered trademark). .

  (6) The present invention is also characterized in that the pressure of the air in the dehumidifying mechanism is lower than the pressure of the high concentration oxygen in the humidifying mechanism. An oxygen concentrator according to any one of the above.

  According to the above invention, even when a hole has opened in the membrane, high-concentration oxygen in the humidifying mechanism leaks into the dehumidifying mechanism, but air in the dehumidifying mechanism leaks into the humidifying mechanism (short-circuited). ) It is not supplied to the patient.

  The membrane has a shape in which a plurality of tubes are bundled, and the air (relatively low pressure) taken from the outside passes through the outside of the plurality of tubes, and the high concentration oxygen (relatively generated by the nitrogen adsorption mechanism) By allowing the high pressure to pass through the inside of the plurality of tubes, the tubes can be prevented from being crushed.

  (7) The present invention is also the oxygen concentrator according to any one of (1) to (6) above, which is used for medical treatment.

  According to the oxygen concentrator described in the above (1) to (7) of the present invention, it is possible to achieve an excellent effect that the efficiency of concentrating oxygen can be prevented from deteriorating.

It is a block diagram which shows the structure of the oxygen concentration apparatus which concerns on this invention. It is a perspective view of a dehumidification / humidification unit.

  Hereinafter, an oxygen concentrator according to the present invention will be described in detail with reference to the drawings.

  First, the structure of the oxygen concentrator 1 according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the oxygen concentrator 1. FIG. 2 is a perspective view of the dehumidifying / humidifying unit. FIG. 3 is a block diagram showing the configuration of the nitrogen adsorption mechanism 13. In each drawing, a part of the configuration is omitted as appropriate, and the drawings are simplified.

  A medical oxygen concentrator 1 shown in FIG. 1 is a device that supplies oxygen OXY to a patient, and concentrates the air AIR taken from outside to generate oxygen OXY having a high concentration (for example, about 90%). . Specifically, the oxygen concentrator 1 includes an intake filter 10, a dehumidifying / humidifying unit 11, a compressor 12, a nitrogen adsorption mechanism 13, a tank 14, a valve 15, a control unit (not shown), and the like. I have.

  Each part of these oxygen concentrators 1 is comprehensively controlled by a control unit. The control unit includes a CPU, a RAM, a ROM, and the like, and executes various controls. The CPU is a so-called central processing unit, and various programs are executed to realize various functions. The RAM is used as a work area for the CPU. The ROM stores a program executed by the CPU.

  The intake filter 10 prevents dust, bacteria, and the like contained in the air AIR taken from outside from entering the inside.

  The dehumidifying / humidifying unit 11 includes a dehumidifying mechanism 11a and a humidifying mechanism 11b. The dehumidifying mechanism 11a and the humidifying mechanism 11b are integrated by being partitioned by a film 11c having water permeability and air permeability. The film 11c is a non-porous film. The membrane 11c is an ion exchange membrane. This membrane 11c employs Nafion (registered trademark) sold by DuPont (USA), DuPont (Chiyoda-ku, Tokyo), or Flemion (registered trademark) sold by Asahi Glass Co., Ltd. (Chiyoda-ku, Tokyo). can do. Nafion (registered trademark) is a fluororesin copolymer based on sulfonated tetrafluoroethylene. Flemion (registered trademark) is produced by hydrolysis after copolymerization of tetrafluoroethylene and a perfluoro vinyl ether containing a carboxylic acid group.

  The film 11c enables exchange of moisture between the gas existing in the space constituting the dehumidifying mechanism 11a and the gas existing in the space constituting the humidifying mechanism 11b. As a result, moisture is transferred from the gas existing in the space constituting the dehumidifying mechanism 11a to the gas existing in the space constituting the humidifying mechanism 11b.

  The dehumidifying mechanism 11 a is provided downstream of the intake filter 10. The dehumidifying mechanism 11 a dehumidifies the air AIR taken from outside through the intake filter 10. For example, the dehumidifying mechanism 11a performs dehumidification so that the relative humidity becomes about 20% when the relative humidity of the air AIR taken from the outside is 20% or more and 80% or less.

  The humidification mechanism 11 b is provided downstream of the valve 15. This humidifying mechanism 11b humidifies the high concentration oxygen OXY stored in the tank 14 before sending it out and supplying it to the patient. For example, the humidification mechanism 11b humidifies the high-concentration oxygen OXY to a relative humidity of about 60% to about 80%, for example.

  The compressor 12 is provided downstream of the dehumidifying mechanism 11a. The compressor 12 compresses the air AIR dehumidified by the dehumidifying mechanism 11a. That is, the compressor 12 generates a pressure difference between the upstream side and the downstream side. Specifically, the compressor 12 sets the air AIR of the dehumidifying mechanism 11a to a pressure lower than the atmospheric pressure, while setting the air AIR or oxygen OXY of the adsorption towers 13a and 13b to a pressure higher than the atmospheric pressure. As a result, the pressure of the air AIR in the dehumidifying mechanism 11a is lower than the pressure of the high concentration oxygen OXY in the humidifying mechanism 11b.

  The nitrogen adsorption mechanism 13 is provided downstream of the compressor 12. The nitrogen adsorption mechanism 13 adsorbs nitrogen contained in the air AIR compressed by the compressor 12 to a catalyst (not shown) to generate high concentration oxygen OXY. Specifically, the nitrogen adsorption mechanism 13 includes a pair of adsorption towers 13a and 13b. The pair of adsorption towers 13a and 13b are provided in parallel. The pair of adsorption towers 13a and 13b is filled with a catalyst. The catalyst also adsorbs moisture, and examples thereof include zeolite. For this reason, the high concentration oxygen OXY produced | generated by the nitrogen adsorption | suction mechanism 13 is dehumidified by 0% or more and 20% or less of relative humidity.

  The nitrogen adsorption mechanism 13 pressurizes one of the adsorption towers 13a or 13b, adsorbs nitrogen on the catalyst, and generates high concentration oxygen OXY. At this time, the nitrogen adsorption mechanism 13 depressurizes the other adsorption tower 13a or 13b to release nitrogen adsorbed on the catalyst, and prepares for the next pressurization. As described above, the nitrogen adsorption mechanism 13 alternately pressurizes and depressurizes the pair of adsorption towers 13a and 13b to generate high-concentration oxygen OXY. For details of the nitrogen adsorption mechanism 13, refer to Japanese Unexamined Patent Application Publication No. 2010-227517.

  The tank 14 is provided downstream of the nitrogen adsorption mechanism 13. The tank 14 stores high-concentration oxygen OXY generated by the nitrogen adsorption mechanism 13.

  The valve 15 is provided downstream of the humidification mechanism 11b. The valve 15 is opened and closed to turn on / off the supply of the high concentration oxygen OXY from the tank 14 to the dehumidifying mechanism 11b and to adjust the supply amount of the high concentration oxygen OXY.

  As shown in FIG. 2, the dehumidifying / humidifying unit 11 bundles a cylindrical chamber 20, an air inlet pipe 21, an air outlet pipe 22, an oxygen inlet pipe 23, an oxygen outlet pipe 24, and a plurality of tubes. And a pair of packings 25 and 26.

  The chamber 20 is hermetically partitioned into three spaces 20a, 20b, and 20c by a pair of packings 25 and 26. These three spaces are arranged in the order of 20a, 20b, and 20c. An oxygen inlet pipe 23 is connected to the space 20a. One end of a plurality of tubes made of the film 11c is connected to the space 20a. An air inlet pipe 21 and an air outlet pipe 22 are connected to the space 20b. A plurality of tubes made of the film 11c are bridged between the pair of packings 25 and 26 in the space 20b. The other end of the plurality of tubes made of the film 11c is connected to the space 20c. An oxygen outlet pipe 24 is connected to the space 20c.

  The air inlet pipe 21 guides the air AIR taken from outside through the intake filter 10 (see FIG. 1) to the space 20b. The air outlet pipe 22 guides the air AIR dehumidified by the dehumidifying / humidifying unit 11 from the space 20b to the compressor 12 (see FIG. 1).

  The oxygen inlet pipe 23 guides the high concentration oxygen OXY stored in the tank 14 (see FIG. 1) to the space 20a. The oxygen outlet pipe 24 guides the high-concentration oxygen OXY humidified by the dehumidifying / humidifying unit 11 from the space 20c to an external patient.

  The plurality of tubes formed of the membrane 11c are so-called bundles of hollow fibers, and are connected between the pair of packings 25 and 26, thereby connecting the spaces 20a and 20c on both sides of the space 20b to each other. As a result, the film 11c having a shape in which a plurality of tubes are bundled guides the high concentration oxygen OXY guided to the space 20a by the oxygen inlet tube 23 to the space 20c. And the film | membrane 11c which has the shape which bundled the some tube moves a water | moisture content from the air AIR in the space 20b which exists in the outer side of the said tube to the high concentration oxygen OXY which exists in the inside of the said tube. In addition, it is preferable that the several tube which consists of the film | membrane 11c is arrange | positioned at intervals.

  As described above, according to the oxygen concentrator 1, since the air AIR taken in from the outside is dehumidified and then reacted by the catalyst, the amount of moisture that the catalyst adsorbs unnecessarily can be reduced. Thereby, the function of the catalyst is not deteriorated, and the efficiency of concentrating the oxygen OXY can be prevented from deteriorating by maintaining the amount of nitrogen that can be adsorbed by the catalyst.

  By the way, in the case of a structure that dehumidifies after compressing the air AIR taken from outside, the high-pressure air AIR affects the film 11c. As a result, a failure such as a hole opening due to deterioration of the film 11c may occur, and the air taken in and compressed from the outside may be sent out through the hole as it is. If a failure occurs during use, high-concentration oxygen OXY that should be sent to the outside cannot be sent to the outside, which may lead to an accident involving human life.

  On the other hand, according to the present invention, the air AIR taken from the outside is dehumidified before being compressed, and the force exerted on the film 11c by the air taken from the outside is small. For this reason, it is possible to prevent a failure such as a hole opening due to deterioration of the film 11c. If no failure occurs, there is no risk of an accident involving human life.

  And since the structure which moves a water | moisture content between the air AIR taken in from the outside and the high concentration oxygen OXY sent out outside is adopted, dehumidification and humidification can be performed by a series of flows. Thereby, the structure which discharges | emits the water | moisture content obtained by dehumidification of air AIR is omissible. Further, it is possible to omit a structure for storing or supplying moisture for humidifying the high concentration oxygen OXY. As a result, the oxygen concentrator 1 can be reduced in size and simplified.

  Further, since the compressor 12 is arranged downstream of the dehumidifying mechanism 11a and the compressor 12 pulls the air AIR from the outside, the speed of the air AIR flowing through the dehumidifying mechanism 11a is increased, and the air The AIR flow can be made turbulent. That is, the air AIR flowing through the dehumidifying mechanism 11a can be sufficiently stirred. Thereby, the volume per hour of the air AIR contacting the film 11c can be increased, and humidification of the high concentration oxygen OXY on the opposite side of the film 11c can be promoted. That is, it is possible to increase the amount of moisture that moves from the air AIR taken from the outside to the high-concentration oxygen OXY on the opposite side of the membrane 11c. As a result, dehumidification of the air AIR taken from the outside can be promoted.

  Furthermore, since the film 11c has a shape in which a plurality of tubes are bundled, the area of the film 11c per unit space can be increased. Thereby, the volume amount which contacts the film | membrane 11c of the air AIR taken in from the outside can be increased. Further, the volume of the high concentration oxygen OXY film 11c sent out to the outside can be increased.

  When the plurality of tubes formed by the film 11c are thin, the film thickness becomes thin, and the strength may be weaker than when the film 11c is a flat surface. However, the structure in which the air AIR taken in from the outside is dehumidified before being compressed, and the force exerted on the film 11c by the air AIR taken in from the outside is small, so that the strength of the film 11c is weak. However, the effect of this is small.

  Since the volume of oxygen in the air AIR is about one-fifth of the entire volume, the volume of the air AIR taken from outside requires about five times the volume of the high-concentration oxygen OXY sent out to the outside. . For this reason, according to the oxygen concentrator 1, the air AIR taken in from the outside having a relatively large volume can be passed outside the plurality of tubes. Moreover, oxygen OXY of high concentration sent out to the outside with a relatively small volume can be passed through the inside of a plurality of tubes. For this reason, a tube can be made thin. As a result, the number of tubes can be increased. As a result, the area of the film 11c per unit space can be increased.

  Furthermore, since the pressure of the air AIR in the dehumidifying mechanism 11a is lower than the pressure of the high-concentration oxygen OXY in the humidifying mechanism 11b, the humidifying mechanism 11b even if a hole is opened in the film 11c. The oxygen OXY in the high concentration leaks into the dehumidifying mechanism 11a, but the air AIR in the dehumidifying mechanism 11a does not leak into the humidifying mechanism 11b (short circuit) and is supplied to the patient.

  The membrane 11c has a shape in which a plurality of tubes are bundled, and the air AIR (relatively low pressure) taken from the outside passes through the outside of the plurality of tubes, and high-concentration oxygen (relative) generated by the nitrogen adsorption mechanism. Therefore, it is possible to prevent the tubes from being crushed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and technical idea thereof.

  That is, in the above embodiment, the position, size (dimension), shape, material, orientation, and quantity of each component can be changed as appropriate.

  For example, in the above embodiment, the case where the nitrogen adsorption mechanism 13 includes a pair of adsorption towers 13a and 13b has been described as an example. However, the number of adsorption towers of the present invention is not limited, and even if there is only one It may be.

  In the above embodiment, the method of the nitrogen adsorption mechanism 13 is not limited, and any method such as a PSVA method, a PVA method, or an SVA method may be used.

  Or in the said embodiment, although the case where the film | membrane 11c had the shape which bundled the some tube was demonstrated to the example, the film | membrane of this invention is not limited to this. The film of the present invention only needs to be able to partition between air taken in from the outside and high-concentration oxygen generated by the nitrogen adsorption mechanism 13, and may have a planar shape or other shapes. Further, the film 11c may be a single sheet or a stack of a plurality of sheets. That is, the film 11c may be wound concentrically.

  Or although the case where the film | membrane 11c has water permeability and air permeability was demonstrated as a favorable example in the said embodiment, the film | membrane of this invention should just have water permeability at least, and has air permeability. There is no need to be. In this case, since the high-concentration oxygen OXY in the humidification mechanism 11b leaks to the dehumidification mechanism 11a, it is necessary to generate the high-concentration oxygen OXY so that the amount supplied to the outside and supplied to the patient is not insufficient.

DESCRIPTION OF SYMBOLS 1 Oxygen concentrator 11a Dehumidification mechanism 11b Humidification mechanism 11c Membrane (Porous membrane, Nafion (registered trademark), Flemion (registered trademark))
12 Compressor 13 Nitrogen adsorption mechanism 13a, 13b Adsorption tower 14 Tank 15 Valve 20 Chamber 20a, 20b, 20c Space 21 Air inlet pipe 22 Air outlet pipe 23 Oxygen inlet pipe 24 Oxygen outlet pipe 25, 26 Packing AIR Air OXY High concentration oxygen

(1) The present invention is an oxygen concentrator used in medical treatment, which is provided with a dehumidifying mechanism for dehumidifying air taken in from the outside, and compresses the air dehumidified by the dehumidifying mechanism provided downstream of the dehumidifying mechanism. A compressor that adsorbs nitrogen contained in the air compressed by the compressor to the catalyst to generate high concentration oxygen, and the high concentration oxygen generated by the nitrogen adsorption mechanism A humidifying mechanism for humidifying before sending out the outside, the dehumidifying mechanism and the humidifying mechanism between the air taken from the outside and the high concentration oxygen generated by the nitrogen adsorption mechanism , which together by partitioning a film which develops a chromatic and shape bundling a plurality of tubes permeable, moisture of the air of the dehumidifying mechanism, through the membrane, the high concentration of the humidifying mechanism It is moved to the oxygen, the double The air taken in from the outside passes through the outside of the plurality of tubes so that the pressure outside the plurality of tubes is lower than the pressure inside the tubes, and the high pressure generated by the nitrogen adsorption mechanism The oxygen concentrator is characterized in that oxygen having a concentration passes through the inside of the plurality of tubes .

Furthermore, since the film has a shape in which a plurality of tubes are bundled, the area of the film per unit space can be increased. Thereby, the volume amount which contacts the film | membrane of the air taken in from the outside can be increased. Moreover, the volume amount which contacts the film | membrane of the high concentration oxygen sent out outside can be increased.
And since the pressure of the air in the dehumidifying mechanism is made lower than the pressure of the high concentration oxygen in the humidifying mechanism, even if a hole is opened in the membrane, Although high concentration oxygen leaks into the dehumidification mechanism, the air in the dehumidification mechanism does not leak into the humidification mechanism (short circuit) and is supplied to the patient.
Further, the tube can be prevented from being crushed.

Claims (7)

A dehumidifying mechanism for dehumidifying the air taken in from the outside,
A compressor that is provided downstream of the dehumidifying mechanism and compresses the air dehumidified by the dehumidifying mechanism;
A nitrogen adsorption mechanism for adsorbing nitrogen contained in the air compressed by the compressor to a catalyst to generate high-concentration oxygen;
A humidifying mechanism for humidifying before sending out the high-concentration oxygen generated by the nitrogen adsorption mechanism to the outside,
The dehumidifying mechanism and the humidifying mechanism are integrated by partitioning the air taken in from the outside and the high-concentration oxygen generated by the nitrogen adsorption mechanism with a water-permeable film. The moisture of the air of the dehumidifying mechanism is moved to the high concentration oxygen of the humidifying mechanism through the membrane.
Oxygen concentrator. The membrane has a shape in which a plurality of tubes are bundled,
One of the air taken in from the outside and the high concentration oxygen generated by the nitrogen adsorption mechanism passes through the inside of the plurality of tubes, and the other passes through the outside of the plurality of tubes. ,
The oxygen concentrator according to claim 1. The air taken in from outside passes outside the plurality of tubes,
The high concentration oxygen generated by a nitrogen adsorption mechanism passes through the inside of the plurality of tubes,
The oxygen concentrator according to claim 2. The membrane is a non-porous membrane,
The oxygen concentrator according to any one of claims 1 to 3. The membrane is Nafion (registered trademark) or Flemion (registered trademark),
The oxygen concentrator according to any one of claims 1 to 4. The pressure of the air in the dehumidifying mechanism is lower than the pressure of the high concentration oxygen in the humidifying mechanism,
The oxygen concentrator according to any one of claims 1 to 5. It is used for medical treatment,
The oxygen concentrator according to any one of claims 1 to 6.

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