Low-oxygen air supply system

Abstract

A low-oxygen air supply system (10) is provided with: a plurality of low-oxygen air supply units (20) that generate low-oxygen air (LA) containing oxygen gas having a lower concentration than the oxygen gas in the air and supply the generated low-oxygen air (LA) to an indoor space (A1); an air supply fan (40) for supplying outside air (OA) to the indoor space (A1); an oxygen sensor (57) for detecting the oxygen concentration in the indoor space (A1); and a control device (50) for controlling the operation of the low-oxygen air supply unit (20) and the air supply fan (40).

Description

Technical Field

[0001] The present disclosure relates to a hypoxic air supply system. Background Art

[0002] Conventionally, a hypoxic air supply system is known that can generate air containing oxygen at a concentration lower than the oxygen concentration in air (about 21%) (hereinafter referred to as hypoxic air) and supply it to a user (see Patent Document 1). The hypoxic air supply system is used, for example, to construct a hypoxic environment for high-altitude training that simulates a high-altitude environment in an indoor space. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-131121 Summary of the invention Technical problem to be solved by the invention

[0004] The conventional hypoxic air supply system cannot continue to supply hypoxic air when a failure occurs. Therefore, the hypoxic air supply system cannot provide a hypoxic environment until repair is completed.

[0005] An object of the present disclosure is to provide a hypoxic air supply system that can continue to provide a hypoxic environment even in the event of a malfunction. Technical solutions adopted to solve technical problems

[0006] (1) The hypoxic air supply system of the present disclosure includes: a first hypoxic air supply unit and a second hypoxic air supply unit, which generate hypoxic air containing oxygen with a concentration lower than the oxygen concentration in the air and supply the generated hypoxic air to a first target space; a fan, which supplies external air to the first target space; an oxygen sensor, which detects the oxygen concentration in the first target space; and a control unit, which controls the operation of the first hypoxic air supply unit, the second hypoxic air supply unit and the fan.

[0007] According to the hypoxic air supply system of the present disclosure, even if any one of the first hypoxic air supply unit and the second hypoxic air supply unit fails, hypoxic air can continue to be supplied through the other unit. Therefore, according to the hypoxic air supply system of the present disclosure, even if any one of the first hypoxic air supply unit and the second hypoxic air supply unit fails, hypoxic air can continue to be supplied.

[0008] (2) On the basis of the hypoxic air supply system of the above-mentioned form (1) of the present disclosure, it is preferred that the first hypoxic air supply unit and the second hypoxic air supply unit have: an adsorbent material that can adsorb nitrogen or oxygen contained in the air and can desorb the adsorbed nitrogen or oxygen; a first adsorption cylinder and a second adsorption cylinder that accommodate the adsorption material; a compressor that supplies air to either the first adsorption cylinder or the second adsorption cylinder or a first opening valve that opens the one direction to the atmosphere; a vacuum pump that exhausts air from the other of the first adsorption cylinder and the second adsorption cylinder or a second opening valve that opens the other direction to the atmosphere; and a switching valve that switches the compressor The air supply target of the compressor or the opening target of the first opening valve is switched to the first adsorption cylinder or the second adsorption cylinder, and the exhaust source of the vacuum pump or the opening source of the second opening valve is switched to the first adsorption cylinder or the second adsorption cylinder which is not the air supply target of the compressor or the opening target of the first opening valve, and the control unit controls the operation of the first low oxygen air supply unit and the second low oxygen air supply unit in a manner that the first moment when the exhaust volume from the vacuum pump or the second opening valve of the first low oxygen air supply unit reaches a peak and the second moment when the exhaust volume from the vacuum pump or the second opening valve of the second low oxygen air supply unit reaches a peak are different.

[0009] In this case, the power consumption and noise generation of the hypoxic air supply system can be suppressed, and the supply amount of the hypoxic air in the hypoxic air supply system can be averaged.

[0010] (3) The hypoxic air supply system according to the above aspect (1) or (2) of the present disclosure preferably further includes a carbon dioxide sensor for detecting the carbon dioxide concentration in the first target space.

[0011] In this case, the carbon dioxide concentration in the first target space can be managed, and the operation of the low oxygen air supply system can be controlled based on the carbon dioxide concentration.

[0012] (4) In the hypoxic air supply system according to any one of the aspects (1) to (3) of the present disclosure, it is preferred that the fan performs second type ventilation on the first target space.

[0013] In this case, it is possible to suppress the variation in the oxygen concentration in the first target space.

[0014] (5) Based on the hypoxic air supply system of any one of the above-mentioned forms (1) to (4) of the present disclosure, it is preferred that the control unit can individually control the first hypoxic air supply unit and the second hypoxic air supply unit, and the hypoxic air supply system also includes isolation valves on the supply path of the hypoxic air supplied from the first hypoxic air supply unit and the supply path of the hypoxic air supplied from the second hypoxic air supply unit, respectively.

[0015] In this case, when one of the first hypoxic air supply unit and the second hypoxic air supply unit fails, the other hypoxic air supply unit can be used to continue the operation of the hypoxic air supply system and replace the failed hypoxic air supply system.

[0016] (6) The hypoxic air supply system according to any one of the above aspects (1) to (5) of the present disclosure preferably further includes a pressure sensor for detecting the supply pressure of the hypoxic air, and the control unit calculates the supply amount of the hypoxic air based on the detection value of the pressure sensor.

[0017] In this case, there is no need to separately provide a flow rate sensor for measuring the supply amount of the hypoxic air.

[0018] (7) The hypoxic air supply system according to any one of the above aspects (1) to (6) of the present disclosure preferably includes two or more oxygen sensors and two or more carbon dioxide sensors.

[0019] In this case, it is possible to distinguish whether an abnormality has occurred in the first target space, such as the oxygen concentration exceeding a predetermined range and becoming an excessively hypoxic state, or whether an abnormality has occurred in the detection value of each sensor itself. By comparing the detection values ​​of each sensor, the sensor can be calibrated.

[0020] (8) The hypoxic air supply system of any one of the above-mentioned forms (1) to (7) of the present disclosure preferably further includes a silencer, and the hypoxic air supplied from the first hypoxic air supply unit and the hypoxic air supplied from the second hypoxic air supply unit are converged at the silencer.

[0021] In this case, the number of silencers can be reduced compared to the case where silencers are provided for each hypoxic air supply unit. In this case, the noise generated from the hypoxic air supply system can be effectively suppressed by a small number of silencers.

[0022] (9) The hypoxic air supply system according to any one of the aspects (1) to (8) of the present disclosure preferably further includes a frame, and the first hypoxic air supply unit and the second hypoxic air supply unit are mounted on the frame.

[0023] In this case, the installation of the hypoxic air supply system becomes easy.

[0024] (10) In the hypoxic air supply system of any one of the above-mentioned (1) to (9) aspects of the present disclosure, preferably, the first hypoxic air supply unit and the second hypoxic air supply unit further generate high oxygen air containing oxygen having a concentration higher than the oxygen concentration in the air, and supply the high oxygen air to the second target space, and further include a flow regulating valve for regulating the supply amount of the high oxygen air, and the control unit regulates the supply amount of the high oxygen air by regulating the opening of the flow regulating valve.

[0025] In this case, the flow rate of the high oxygen air is adjusted by the flow rate control valve, so that the flow rate of the low oxygen air can be adjusted. The size of the flow rate control valve provided in the piping system of the high oxygen air is smaller than the size of the flow rate control valve provided in the piping system of the low oxygen air. Therefore, a structure for adjusting the flow rate of the low oxygen air using the flow rate control valve can be constructed at a lower cost.

[0026] (11) In the hypoxic air supply system of the above-mentioned aspect (10) of the present disclosure, it is preferred that the oxygen sensor is further arranged in the second target space, and the control unit calculates the supply capacity of the hypoxic air supplied to the first target space based on the detection value of the oxygen sensor in the second target space.

[0027] In this case, for the first target space, the hypoxic air supply capacity calculated based on the detection values ​​of the pressure sensor and the oxygen sensor and the hypoxic air supply capacity calculated based on the detection value of the oxygen sensor of the second target space can be compared, thereby making it easy to confirm whether the hypoxic air supply system is functioning normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic configuration diagram of a hypoxic air supply system according to an embodiment of the present disclosure. Figure 2 It is a perspective schematic diagram of a hypoxic air supply system according to an embodiment of the present disclosure. Figure 3 It is a block diagram of a hypoxic air supply system according to one embodiment of the present disclosure. Figure 4A It is a block diagram of the low oxygen air supply unit according to the first embodiment. Figure 4BIt is a block diagram of a low oxygen air supply unit according to the second embodiment. Figure 4C It is a block diagram of a hypoxic air supply unit according to a third embodiment. Figure 5A It is a perspective schematic diagram showing a low oxygen air supply unit. Figure 5B It is a perspective schematic diagram showing an integrated unit. Figure 6 This is a diagram showing an example of a business plan of a store to which the hypoxic air supply system is applied and an operation plan of the hypoxic air supply system. Figure 7 It is a diagram showing changes in oxygen concentration, carbon dioxide concentration, the number of operating hypoxic air supply units and air supply fans, and the number of users of the hypoxic air supply system during the preparation operation. Figure 8 It is a diagram showing changes in oxygen concentration, carbon dioxide concentration, the number of operating hypoxic air supply units and air supply fans, and the number of users of the hypoxic air supply system during commercial operation. Fig. 9 It is a diagram showing changes in oxygen concentration, carbon dioxide concentration, the number of operating hypoxic air supply units and air supply fans, and the number of users of the hypoxic air supply system during the end of operation. Fig.10 It is a diagram showing the periodic variation of the air supply amount and air supply pressure of the hypoxic air supply unit. DETAILED DESCRIPTION

[0029] Hereinafter, the oxygen supply device of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the present disclosure is not limited to these examples, but is intended to include all changes within the meaning and scope of the claims and equivalents to the claims.

[0030] [Hypoxic air supply system] Figure 1 This is a schematic configuration diagram of a hypoxic air supply system according to an embodiment of the present disclosure. Figure 2 It is a perspective schematic diagram of a hypoxic air supply system according to an embodiment of the present disclosure. Figure 3 It is a block diagram of a hypoxic air supply system according to one embodiment of the present disclosure. Figure 1 and Figure 2The hypoxic air supply system 10 shown is one embodiment of the hypoxic air supply system of the present disclosure. The hypoxic air supply system 10 is a system that generates air containing oxygen at a concentration lower than the oxygen concentration in the air (about 21%) (hereinafter referred to as hypoxic air LA) and supplies it to a target space. The hypoxic air supply system 10 supplies the hypoxic air LA to the indoor space (first target space) A1, thereby constructing a hypoxic environment for high-altitude training in the indoor space A1. In addition, the hypoxic air supply system 10 can generate air containing oxygen at a concentration higher than the oxygen concentration in the air (about 21%) (hereinafter referred to as hyperoxia air HA) while generating the hypoxic air LA.

[0031] like Figure 1 to Figure 3 As shown, the hypoxic air supply system 10 includes an integrated unit 11, an air supply fan 40, and a control device 50. Figure 2 As shown, the hypoxic air supply system 10 includes a plurality of integrated units 11. Figure 1 As shown, the integrated unit 11 includes a plurality of hypoxic air supply units 20. The control device 50 is connected to the plurality of hypoxic air supply units 20 and the air supply fan 40, and controls their operations.

[0032] like Figure 1 and Figure 2 As shown, in the hypoxic air supply system 10 of the present embodiment, the integrated unit 11, the air supply fan 40 and the control device 50 are arranged in the machine room A2. In the present embodiment, the machine room A2 is a space adjacent to the indoor space A1. In the following description, the space outside the indoor space A1 and the machine room A2 is referred to as the outdoor space A3. In addition, the outdoor space A3 shown in the present embodiment is outdoors, but it can also be indoors.

[0033] The hypoxic air supply system 10 of the present embodiment is used together with an air conditioner 80 that adjusts the temperature in the indoor space A1. The temperature of the indoor space A1 is adjusted by the air conditioner 80.

[0034] like Figure 1 As shown, in the hypoxic air supply system 10 of the present disclosure, a high oxygen environment is constructed in the high oxygen chamber (second target space) A4. Figure 2, the record of the hyperoxia chamber A4 is omitted. The hypoxic air supply system 10 supplies hyperoxia air HA to the hyperoxia chamber A4. The person in the hyperoxia chamber A4 can expect to obtain the effect of promoting fatigue recovery by inhaling the hyperoxia air HA. The hyperoxia chamber A4 can be used, for example, to recover the fatigue of the user after high-altitude training in the indoor space A1. In this way, in the hypoxic air supply system 10 disclosed in the present invention, by providing the hyperoxia chamber A4, the generated hyperoxia air HA can be effectively utilized. In addition, in the hypoxic air supply system 10 shown in the present embodiment, the hyperoxia chamber A4 is provided, but the hypoxic air supply system 10 disclosed in the present invention can also be configured to omit the hyperoxia chamber A4 and exhaust the generated hyperoxia air HA to the outside.

[0035] like Figure 1 and Figure 2 As shown, the hypoxic air supply system 10 includes an external air supply pipe 12, a hypoxic air supply pipe 13, and a high oxygen air supply pipe 14. The external air supply pipe 12 is a pipe for supplying air used for generating hypoxic air LA and high oxygen air HA (hereinafter referred to as external air OA) to each integrated unit 11. The hypoxic air supply pipe 13 is a pipe for supplying the hypoxic air LA generated in each integrated unit 11 to the indoor space A1. The high oxygen air supply pipe 14 is a pipe for supplying the high oxygen air HA generated in each integrated unit 11 to the high oxygen chamber A4.

[0036] The hypoxic air supply system 10 supplies the hypoxic air LA generated in each hypoxic air supply unit 20 to the indoor space A1 via the hypoxic air supply pipe 13 and the supply port 16. In addition, one end of the external air supply pipe 12 shown in the present embodiment is open to the outdoor space A3, and the air (external air OA) of the outdoor space A3 is sucked from the one end, but it can also be configured to open the one end to the machine room A2, and the air (external air OA) of the machine room A2 is sucked from the one end. In this case, a ventilator for introducing the external air OA from the outdoor space A3 into the machine room A2 can be pre-set on the wall surface of the machine room A2. In addition, the temperature in the machine room A2 is preferably adjusted by the air conditioner 81.

[0037] In addition, the hypoxic air supply system 10 has an external air duct 15 that connects the indoor space A1 with the outdoor space A3. The air supply fan 40 is arranged in the middle of the external air duct 15. The hypoxic air supply system 10 supplies the external air OA to the indoor space A1 through the external air duct 15 and the blow-off port 41 by the operation of the air supply fan 40. In addition, the hypoxic air supply system 10 can also be configured to provide a filter with a deodorizing function in the middle of the hypoxic air supply pipe 13, thereby removing the peculiar smell of the hypoxic air LA. The hypoxic air supply system 10 can also be configured to provide a device for adding fragrance to the hypoxic air LA through aromatic oil or the like in the middle of the hypoxic air supply pipe 13, and supply the hypoxic air LA with the added fragrance to the indoor space A1.

[0038] (Hypoxic air supply unit) In the present embodiment, as a method of generating low oxygen air by the low oxygen air supply unit, a method using a nitrogen adsorbent is described, but the present invention is not limited thereto, and for example, a membrane separation method using a hollow fiber membrane may be used. Figure 4A It is a block diagram of the low oxygen air supply unit according to the first embodiment. Figure 5A 20 is a perspective view showing a hypoxic air supply unit. The hypoxic air supply unit 20 is a minimum unit for generating hypoxic air LA. In addition, in the following description, the hypoxic air supply unit 20 of the first embodiment is also referred to as the first unit 20A. In the following description, the term "hypoxic air supply unit 20" refers to the first unit 20A and the hypoxic air supply units 20 ( Figure 4B The second unit 20B and Figure 4C The common structure in the third unit 20C) shown is explained.

[0039] Here, the structure of the first unit 20A is first described. Figure 4A and Figure 5A As shown, the first unit 20A includes a housing 21, a compressor 22, a vacuum pump 23, a flow switching valve 24, an adsorption cylinder 25, a non-return valve 26, a purge valve 27, an oxygen container 28, a pressure reducing valve 29, and a flow regulating valve 30. The first unit 20A is configured to accommodate the compressor 22, the vacuum pump 23, the flow switching valve 24, the adsorption cylinder 25, the non-return valve 26, the purge valve 27, the oxygen container 28, the pressure reducing valve 29, and the flow regulating valve 30 inside the housing 21. In addition, the compressor 22 and the vacuum pump 23 used in the first unit 20A may also be configured as an integrated fluid machine. In addition, in the following description, when the exhaust gas from the vacuum pump 23 is used as the hypoxic air LA, the exhaust gas from the vacuum pump 23 is sometimes referred to as "air supply".

[0040] like Figure 4A and Figure 5A As shown, the hypoxic air supply unit 20 has an external air intake port 31, a hypoxic air exhaust port 32, and a high oxygen air exhaust port 33. The external air intake port 31 is a portion for connecting a pipe (tube) for introducing external air OA into the hypoxic air supply unit 20, and has a joint to which the pipe can be connected. The hypoxic air exhaust port 32 is a portion for connecting a pipe (tube) for exhausting the hypoxic air LA generated in the hypoxic air supply unit 20 to the outside, and has a joint to which the pipe can be connected. The high oxygen air exhaust port 33 is a portion for connecting a pipe (tube) for exhausting the high oxygen air HA generated in the hypoxic air supply unit 20 to the outside, and has a joint to which the pipe can be connected. The hypoxic air supply unit 20 includes a port 34 for connecting wiring on the surface of the housing 21 (see Figure 1 and Figure 5A ). The wiring connected to the port 34 is connected to the control device 50 .

[0041] like Figure 4A As shown, the compressor 22 compresses air (outside air OA) sucked from the outside (outdoor space A3) and supplies the air to the adsorption cylinder 25 via the flow path switching valve 24. The vacuum pump 23 sucks the air passing through the adsorption cylinder 25 and exhausts the air.

[0042] The adsorption cylinder 25 is a pressure container for storing an adsorption material X, and the adsorption material X adsorbs nitrogen in the compressed air supplied from the compressor 22. The adsorption cylinder 25 is composed of a first adsorption cylinder 25a and a second adsorption cylinder 25b. The adsorption material X used in the hypoxic air supply unit 20 of the present embodiment is zeolite. In addition, the adsorption material used in the hypoxic air supply unit of the present disclosure is not limited thereto, and for example, it may also be an adsorption material that adsorbs oxygen.

[0043] The adsorbent (zeolite) X can adsorb nitrogen contained in the air. When the adsorbent X is depressurized in a state where it adsorbs nitrogen, the adsorbed nitrogen can be desorbed (released). When air is passed through a space filled with the adsorbent X, the nitrogen in the air is adsorbed, thereby increasing the oxygen concentration in the air. On the other hand, when air is passed through a space filled with the adsorbent X in a state where nitrogen is adsorbed, the oxygen concentration in the air decreases due to the release of nitrogen from the adsorbent X. The hypoxic air supply unit 20 can generate hypoxic air LA and hyperoxic air HA by utilizing the function of the adsorbent X to adsorb nitrogen and the function of releasing the adsorbed nitrogen.

[0044] The adsorption cylinder 25 generates high oxygen air HA using one of the first adsorption cylinder 25a and the second adsorption cylinder 25b, and generates low oxygen air LA using the other. The flow path switching valve 24 is composed of a first switching valve 24a and a second switching valve 24b. The first adsorption cylinder 25a is switched to either a state of being connected to the compressor 22 or a state of being connected to the vacuum pump 23 by the first switching valve 24a. The second adsorption cylinder 25b is switched to a state of being connected to the vacuum pump 23 when the first adsorption cylinder 25a is connected to the compressor 22 by the second switching valve 24b, and is switched to a state of being connected to the compressor 22 when the first adsorption cylinder 25a is connected to the vacuum pump 23.

[0045] The oxygen container 28 stores the high-oxygen air HA generated in the first adsorption column 25 a and the second adsorption column 25 b .

[0046] The first unit 20A shown in the present embodiment adopts a VPSA (Vacuum Pressre Swing Adsorption System) type oxygen concentration method. In the VPSA type oxygen concentration method, during the period when compressed air is supplied to one of the first adsorption cylinder 25a and the second adsorption cylinder 25b, the other of the first adsorption cylinder 25a and the second adsorption cylinder 25b is sucked by the vacuum pump 23 to reduce the pressure. The hypoxic air supply system 10 of the present disclosure may also adopt an oxygen concentration method other than the VPSA type. The hypoxic air supply system 10 of the present disclosure may also adopt a PSA (Pressre Swing Adsorption System) type oxygen concentration method. In the PSA type oxygen concentration method, during the period when compressed air is supplied to one of the first adsorption cylinder 25a and the second adsorption cylinder 25b by the compressor 22, the other is opened to the atmosphere to reduce the pressure, or during the period when one of the first adsorption cylinder 25a and the second adsorption cylinder 25b is opened to the atmosphere, the other is exhausted by the vacuum pump 23 to reduce the pressure.

[0047] Figure 4B 2 is a block diagram of a hypoxic air supply unit according to a second embodiment. Figure 4B The hypoxic air supply unit 20 shown. In the following description, the hypoxic air supply unit 20 of the second embodiment is also referred to as a second unit 20B. Figure 4B The second unit 20B shown is different from the first unit 20A in that a first opening valve 37 is provided instead of the vacuum pump 23 , and the remaining structure is the same as that of the first unit 20A.

[0048] In the second unit 20B, the adsorbent X in the first adsorption cylinder 25a and the second adsorption cylinder 25b, which are pressurized by the compressor 22, adsorbs nitrogen in the air, and the adsorbent X in the other side, which is opened to the atmosphere through the second opening valve 38, releases the adsorbed nitrogen, thereby generating low oxygen air LA and high oxygen air HA. In addition, the second unit 20B shown in this embodiment has the first opening valve 37, but the first opening valve 37 may be omitted. In this case, the flow path switching valve 24 assumes the function of the first opening valve 37.

[0049] Figure 4C : is a block diagram of a hypoxic air supply unit according to a third embodiment. Figure 4C The hypoxic air supply unit 20 shown. In the following description, the hypoxic air supply unit 20 of the third embodiment is also referred to as a third unit 20C. Figure 4C The third unit 20C shown is different from the first unit 20A in that a second open valve 38 is provided instead of the compressor 22, and the remaining structure is the same as the first unit 20A.

[0050] In the third unit 20C, the adsorbent X in one of the first adsorption cylinder 25a and the second adsorption cylinder 25b that is open to the atmosphere through the second opening valve 38 adsorbs nitrogen in the air, and the adsorbent X in the other one that is depressurized by the vacuum pump 23 releases the adsorbed nitrogen, thereby generating low oxygen air LA and high oxygen air HA. In addition, the third unit 20C shown in this embodiment has the second opening valve 38, but the second opening valve 38 may be omitted. In this case, the flow path switching valve 24 assumes the function of the second opening valve 38.

[0051] The first switching valve 24a and the second switching valve 24b are so-called three-port valves. Figure 4A As shown, in the first unit 20A, the first switching valve 24a and the second switching valve 24b switch between a pressurized state in which compressed air discharged from the compressor 22 is supplied to the adsorption cylinder 25 and a decompressed state in which the air in the adsorption cylinder 25 is exhausted to the outside by suction by the vacuum pump 23. When one of the first adsorption cylinder 25a and the second adsorption cylinder 25b is in a pressurized state, the other is in a decompressed state.

[0052] like Figure 4B As shown, in the second unit 20B, the first switching valve 24a and the second switching valve 24b switch between a pressurized state in which the compressed air discharged from the compressor 22 is supplied to the adsorption cylinder 25 and an open state in which the first opening valve 37 is set to "open" to open the inside of the adsorption cylinder 25 to the atmosphere. When one of the first adsorption cylinder 25a and the second adsorption cylinder 25b is in a pressurized state, the other is in an atmospheric pressure state.

[0053] like Figure 4C As shown, in the third unit 20C, the first switching valve 24a and the second switching valve 24b switch between a reduced pressure state in which the air in the adsorption cylinder 25 is exhausted to the outside by suction by the vacuum pump 23 and an open state in which the second opening valve 38 is set to "open" to open the inside of the adsorption cylinder 25 to the atmosphere. When one of the first adsorption cylinder 25a and the second adsorption cylinder 25b is in the reduced pressure state, the other is in the atmospheric pressure state.

[0054] The one-way valve 26 prevents the backflow of hypoxic air and high oxygen air. The one-way valve 26 is composed of a first one-way valve 26a and a second one-way valve 26b. The first one-way valve 26a is arranged in the flow path on the downstream side of the first adsorption cylinder 25a, and the second one-way valve 26b is arranged in the flow path on the downstream side of the second adsorption cylinder 25b. By providing the first one-way valve 26a and the second one-way valve 26b, the hypoxic air supply unit 20 is configured so that the high oxygen air HA discharged from the first adsorption cylinder 25a and the second adsorption cylinder 25b flows only toward the downstream side. The purge valve 27 is arranged in the flow path connecting the flow path between the first adsorption cylinder 25a and the first one-way valve 26a and the flow path between the second adsorption cylinder 25b and the second one-way valve 26b.

[0055] The high oxygen air HA from the first check valve 26a and the high oxygen air HA from the second check valve 26b are alternately supplied to the oxygen container 28 and stored in the oxygen container 28. A pressure reducing valve 29 and a flow rate regulating valve 30 are provided on the downstream side of the oxygen container 28. The pressure reducing valve 29 reduces the pressure of the high oxygen air HA supplied from the oxygen container 28 to the outside, and the flow rate regulating valve 30 regulates the flow rate of the high oxygen air HA. The flow rate regulating valve 30 regulates the flow rate of the high oxygen air HA supplied from the oxygen container 28 to the outside.

[0056] exist Figure 4A The first unit 20A shown is provided with an air release valve 27. When the air in one of the first adsorption cylinder 25a and the second adsorption cylinder 25b is exhausted by the vacuum pump 23, the air release valve 27 is set to an open state, so that the air in the other of the first adsorption cylinder 25a and the second adsorption cylinder 25b moves to the adsorption cylinder 25 on one side through the air release valve 27, thereby efficiently exhausting the air in the adsorption cylinder 25 on the one side.

[0057] exist Figure 4B In the second unit 20B shown, the air release valve 27 is set to an open state when the first opening valve 37 is set to "open" to open the air in one of the first adsorption cylinder 25a and the second adsorption cylinder 25b to the atmosphere. In the second unit 20B, the air in the other of the first adsorption cylinder 25a and the second adsorption cylinder 25b is moved to the adsorption cylinder 25 of the one through the air release valve 27, so that the air in the adsorption cylinder 25 of the one can be exhausted efficiently.

[0058] exist Figure 4C In the third unit 20C shown, the air release valve 27 is set to an open state when the second opening valve 38 is set to "open" to open the air in one of the first adsorption cylinder 25a and the second adsorption cylinder 25b to the atmosphere. In the second unit 20B, the air in the one adsorption cylinder 25 is moved to the other adsorption cylinder 25 via the air release valve 27, so that the air in the other adsorption cylinder 25 can be exhausted efficiently.

[0059] The flow regulating valve 30 is a valve for regulating the supply amount of the hyperoxic air HA. The hypoxic air supply unit 20 regulates the flow rate of the air discharged from the compressor 22 by regulating the valve opening of the flow regulating valve 30, thereby regulating the supply amount of the hyperoxic air HA. In addition, the hypoxic air supply unit 20 shown in the present embodiment includes the flow regulating valve 30, but the flow regulating valve 30 may be omitted. In this case, the supply amount of the hyperoxic air HA is regulated by adjusting the rotation speed of the motor (not shown) driving the compressor 22, or the number of the hypoxic air supply units 20 is controlled, so that the supply amounts of the hyperoxic air HA and the hypoxic air LA can be regulated.

[0060] In addition, in the hypoxic air supply system 10 of the present disclosure, the flow control valve 30 is only provided in the piping system of the hyperoxic air HA, but the flow control valve 30 may also be provided in the piping system of the hypoxic air LA. In addition, when the supply amount of the hyperoxic air HA is adjusted by the flow control valve 30, not only the flow rate of the hypoxic air LA but also the oxygen concentration in the hypoxic air LA can be adjusted. In the hypoxic air supply system 10 of the present disclosure, the oxygen concentration in the hypoxic air LA is adjusted by adjusting the flow rate of the hyperoxic air HA by the flow control valve 30.

[0061] In this way, the hypoxic air supply unit 20 has a flow control valve 30 for adjusting the supply amount of air from the compressor 22. The hypoxic air supply system 10 of the above structure can adjust the flow rate of the hypoxic air LA by adjusting the flow rate of the hyperoxic air HA. In this case, a smaller flow control valve 30 can be used to adjust the flow rate of the hypoxic air LA. As a result, the cost of installing the flow control valve 30 can be reduced.

[0062] (Comprehensive Unit) Figure 5B is a three-dimensional schematic diagram showing the integrated unit. Figure 1 , Figure 2 as well as Figure 5B As shown, the integrated unit 11 is composed of a plurality of hypoxic air supply units 20 , a plurality of silencers 60 , and a frame 70 .

[0063] The silencer 60 is a pipe member in the form of a header, and has a function as a header and a function as a positive displacement silencer. The silencer 60 includes: a first silencer 61, which is provided in the piping system of the outside air OA supplied to the hypoxic air supply unit 20; a second silencer 62, which is provided in the piping system of the hypoxic air LA supplied from the hypoxic air supply unit 20; and a third silencer 63, which is provided in the piping system of the high oxygen air HA supplied from the hypoxic air supply unit 20.

[0064] like Figure 1 As shown, the first silencer 61 is provided in the middle of the external air supply pipe 12, and the external air supply pipe 12 is branched into a plurality of pipes. In the integrated unit 11, the plurality of external air supply pipes 12 extending from the first silencer 61 are connected to the external air intake port 31 of each hypoxic air supply unit 20. The first silencer 61 reduces the noise propagating from the hypoxic air supply unit 20 along the external air supply pipe 12 to the outside.

[0065] The second silencer 62 is provided in the middle of the hypoxic air supply pipe 13 to collect the plurality of hypoxic air supply pipes 13. In the integrated unit 11, the plurality of hypoxic air supply pipes 13 extending from the second silencer 62 are connected to the hypoxic air discharge ports 32 of the respective hypoxic air supply units 20. The second silencer 62 reduces the noise propagating from the hypoxic air supply unit 20 along the hypoxic air supply pipe 13 to the outside.

[0066] The third silencer 63 is provided in the middle of the high oxygen air supply pipe 14 to collect the plurality of high oxygen air supply pipes 14. In the integrated unit 11, the plurality of high oxygen air supply pipes 14 extending from the third silencer 63 are connected to the high oxygen air discharge ports 33 of the respective low oxygen air supply units 20. The third silencer 63 reduces the noise propagating from the low oxygen air supply unit 20 along the high oxygen air supply pipe 14 to the outside.

[0067] The rack 70 is a rack capable of mounting a plurality of hypoxic air supply units 20 and a plurality of silencers 60. In the hypoxic air supply system 10 of the present disclosure, the integrated unit 11 is configured such that four hypoxic air supply units 20 and the first to third silencers 61, 62, 63 are mounted on one rack 70. Figure 2 The hypoxic air supply system 10 shown has eight integrated units 11, including a total of 32 hypoxic air supply units 20. In addition, the number of hypoxic air supply units 20 constituting the integrated unit 11 is not limited to the number (four) shown in the present embodiment, as long as it is two or more. The number of hypoxic air supply units 20 constituting the hypoxic air supply system 10 of the present disclosure can be appropriately set in consideration of the size of the indoor space A1, the number of users, etc., and is not limited to the number (32) shown in the present embodiment.

[0068] Thus, in the hypoxic air supply system 10 of the present embodiment, each hypoxic air supply unit 20 is installed in the frame 70. In the above-mentioned hypoxic air supply system 10, the hypoxic air supply unit 20 can be three-dimensionally arranged in each integrated unit 11, thereby suppressing the installation space and facilitating the installation of the hypoxic air supply system 10.

[0069] In the hypoxic air supply system 10 of the present embodiment, the hypoxic air LA supplied from the plurality of hypoxic air supply units 20 is converged by the first silencer 61. Compared with the case where the silencer 60 is provided in each hypoxic air supply unit 20, the hypoxic air supply system 10 of the above structure can reduce the number of silencers 60. Therefore, according to the hypoxic air supply system 10, the noise generated from each hypoxic air supply unit 20 can be effectively suppressed by a small number of silencers 60. In addition, in the present embodiment, the case where the machine room A2 is used as the installation location of the integrated unit 11 is exemplified, but the installation location of the integrated unit 11 is not limited thereto, and for example, it can also be installed in the indoor space A1. In the hypoxic air supply system 10, the noise generated from each hypoxic air supply unit 20 is suppressed by the plurality of silencers 60, so the integrated unit 11 can be installed in the indoor space A1.

[0070] (Supply air fan) The air supply fan 40 is a fan for supplying air (outside air OA) from the outdoor space A3 to the indoor space A1. In addition, in the present embodiment, the air supply fan 40 sucks air from the outdoor space A3, but it may also suck air from the machine room A2 (outside air OA). In this case, a vent is provided in advance on the wall surface of the machine room A2, and the air supply fan 40 sucks the outside air OA introduced from the outdoor space A3 to the machine room A2 through the vent.

[0071] In the hypoxic air supply system 10 of the present disclosure, the indoor space A1 is ventilated by the air supply fan 40. In the hypoxic air supply system 10 of the present disclosure, a gap (not shown) connected to the outdoor space A3 is provided in the indoor space A1. For example, the gap is preferably an opening (lower cutout, Japanese: アンダーカット) provided at the lower part of the door, etc. When the indoor space A1 is supplied with external air OA by the air supply fan 40, the air flows from the gap to the machine room A2 and the outdoor space A3 on the low-pressure side, thereby ventilating the indoor space A1. That is, in the hypoxic air supply system 10, the indoor space A1 is ventilated by the air supply fan 40. In other words, in the hypoxic air supply system 10 of the present disclosure, the exhaust is not exhausted from the indoor space A1 by the exhaust fan. In the hypoxic air supply system 10 of the present disclosure, the outside air OA supplied by the air supply fan 40 and the hypoxic air LA supplied by the hypoxic air supply unit 20 are merged in the indoor space A1. In the hypoxic air supply system 10 of the above structure, the size (duct size) of the outside air duct 15 can be suppressed.

[0072] (Control device) Figure 1 to Figure 3 The control device 50 shown is connected to each hypoxic air supply unit 20 and the air supply fan 40, and controls their operations. In addition, here, the case where the first unit 20A is used as the hypoxic air supply unit 20 is exemplified. Figure 3 As shown, the control device 50 includes a drive control unit 51 and a storage unit 52. The drive control unit 51 controls the operations of the compressor 22, the vacuum pump 23, the flow path switching valve 24, the purge valve 27, the flow rate regulating valve 30, and the air supply fan 40. The storage unit 52 stores in advance a program that can individually control all the hypoxic air supply units 20 included in the hypoxic air supply system 10.

[0073] In addition, the control device 50 is connected to the operating PC 51 and the management PC 52 via a communication cable and a router 54. The hypoxic air supply system 10 is operated and stopped based on the operation and setting of the operating PC 51 by the user. The operating PC 51 has a display (not shown) that displays information such as the working state of the hypoxic air supply system 10 and the supply amount of the hypoxic air LA. The operating PC 51 is arranged near the integrated unit 11 (hypoxic air supply unit 20). The management PC 52 is arranged in the indoor space A1. The hypoxic air supply system 10 prompts the user in the indoor space A1 with information such as the current oxygen concentration and carbon dioxide concentration of the indoor space A1 through the display 55 connected to the management PC 51. In addition, when an abnormality occurs in the hypoxic air supply system 10, the control device 50 uses the display connected to the operating PC 51 and the display 55 connected to the management PC 52 to notify the occurrence of the abnormality. In addition, in this embodiment, the case where the management PC 52 is provided is illustrated, but the management PC 52 may also be omitted. In this case, the operating PC 51 and the display 55 may be connected to present information such as the oxygen concentration and the carbon dioxide concentration in the indoor space A1 via the operating PC 51 and the display 55 .

[0074] In addition, the control device 50 is connected to the remote operation PC 53 via the Internet line 90 and the server 56. The hypoxic air supply system 10 can be operated and stopped by a manager at a remote location to monitor the oxygen concentration, carbon dioxide concentration, etc. in the indoor space A1. In addition, in the hypoxic air supply system 10 of the present disclosure, the remote operation PC 53 can also be omitted.

[0075] In addition, although Figure 3 Although not shown in the figure, the second unit 20B (see Figure 4B ), the control device 50 is connected to the first open valve 37, or the third unit 20C (see Figure 4C ), the control device 50 is connected to the second open valve 38. In the above case, the control device 50 controls the first open valve 37 or the second open valve 38.

[0076] In addition, the control device 50 is connected to a sensor unit 59 . The sensor unit 59 is installed in the indoor space A1 . The sensor unit 59 includes an oxygen sensor 57 and a carbon dioxide sensor 58 .

[0077] The oxygen sensor 57 is a sensor for detecting the oxygen concentration in the space. The carbon dioxide sensor 58 is a sensor for detecting the carbon dioxide concentration in the space. In addition, in the hypoxic air supply system 10 of the present disclosure, the oxygen sensor 57 used for the indoor space A1 is composed of two oxygen sensors 57 (a first oxygen sensor 57a and a second oxygen sensor 57b). The carbon dioxide sensor 58 in the hypoxic air supply system 10 of the present disclosure is composed of two carbon dioxide sensors 58 (a first carbon dioxide sensor 58a and a second carbon dioxide sensor 58b). In addition, in the present embodiment, the case where the number of oxygen sensors 57 and carbon dioxide sensors 58 of the hypoxic air supply system 10 is two respectively is illustrated, but the hypoxic air supply system 10 of the present disclosure may also have more than three oxygen sensors 57 and carbon dioxide sensors 58.

[0078] The hypoxic air supply system 10 of the present disclosure further includes an oxygen sensor 57 (third oxygen sensor 57c) for the hyperoxic chamber A4. The third oxygen sensor 57c is disposed in the hyperoxic chamber A4 to detect the oxygen concentration in the hyperoxic chamber A4. In the hypoxic air supply system 10, the control device 50 can calculate the supply capacity of the hypoxic air LA in the hypoxic air supply system 10 (the oxygen concentration in the hypoxic air LA and the supply amount of the hypoxic air LA) based on the detection value of the third oxygen sensor 57c (the oxygen concentration in the hyperoxic air HA). In the hypoxic air supply system 10 of the above structure, for the indoor space A1, the supply capacity of the hypoxic air LA calculated based on the detection values ​​of the third pressure sensor 67 and the oxygen sensor 57 and the like is compared with the supply capacity of the hypoxic air LA calculated based on the detection value of the third oxygen sensor 57c, so that it is easy to confirm whether the hypoxic air supply system 10 is functioning normally. In addition, the installation location of the third oxygen sensor 57c is not limited to the hyperoxic chamber A4, and can also be installed in the hyperoxic air supply pipe 14, the oxygen container 28, etc.

[0079] The control device 50 adjusts the supply amount of the hypoxic air LA according to the detection value of the oxygen sensor 57 (i.e., the oxygen concentration of the indoor space A1). The control device 50 adjusts the supply amount of the hypoxic air LA by adjusting the opening of the flow control valve 30, changing the number of hypoxic air supply units 20, or changing the rotation speed of each motor of the compressor 22 and the vacuum pump 23 in each hypoxic air supply unit 20.

[0080] The control device 50 adjusts the supply amount of the hypoxic air LA according to the detection value of the carbon dioxide sensor 58 (i.e., the carbon dioxide concentration of the indoor space A1). In the hypoxic air supply system 10, when the carbon dioxide concentration of the indoor space A1 increases, the carbon dioxide concentration of the indoor space A1 can be reduced by increasing the supply amount of the hypoxic air LA (in other words, the supply amount of nitrogen).

[0081] In addition, the control device 50 is connected to the first pressure sensor 35 and the second pressure sensor 36. The first pressure sensor 35 and the second pressure sensor 36 are provided in the housing 21.

[0082] The first pressure sensor 35 is a sensor for detecting the supply pressure of the hypoxic air LA in the hypoxic air supply unit 20, and is provided in the hypoxic air supply pipe 13 in the hypoxic air supply unit 20. The second pressure sensor 36 is a sensor for detecting the supply pressure of the hyperoxic air HA in the hypoxic air supply unit 20, and is provided in the hyperoxic air supply pipe 14 in the hypoxic air supply unit 20.

[0083] The control device 50 calculates the supply amount (flow rate) of the hypoxic air LA in the hypoxic air supply unit 20 based on the detection value (pressure) of the first pressure sensor 35 and the pipe diameter of the hypoxic air supply pipe 13 and other information. The control device 50 calculates the supply amount (flow rate) of the hyperoxic air HA in the hypoxic air supply unit 20 based on the detection value (pressure) of the second pressure sensor 36 and the pipe diameter of the hyperoxic air supply pipe 14 and other information.

[0084] In addition, the control device 50 is connected to the third pressure sensor 67, the fourth pressure sensor 68, and the fifth pressure sensor 69. The third pressure sensor 67, the fourth pressure sensor 68, and the fifth pressure sensor 69 are provided in the machine room A2.

[0085] The third pressure sensor 67 is a sensor for detecting the supply pressure of the hypoxic air LA, and is provided in the hypoxic air supply pipe 13 after the confluence at the second muffler 62. The fourth pressure sensor 68 is a sensor for detecting the supply pressure of the hyperoxic air HA, and is provided in the hyperoxic air supply pipe 14 after the confluence at the third muffler 63. The fifth pressure sensor 69 is a sensor for detecting the supply pressure of the external air OA, and is provided in the external air duct 15.

[0086] The control device 50 calculates the total supply amount of the hypoxic air LA in the hypoxic air supply system 10 based on the detection value of the third pressure sensor 67 and the information such as the pipe diameter of the hypoxic air supply pipe 13. The control device 50 calculates the total supply amount of the high oxygen air HA in the hypoxic air supply system 10 based on the detection value of the fourth pressure sensor 68 and the information such as the pipe diameter of the high oxygen air supply pipe 14. The control device 50 calculates the supply amount of the external air OA in the hypoxic air supply system 10 based on the detection value of the fifth pressure sensor 69. In addition, in the hypoxic air supply system 10 of the present disclosure, the fifth pressure sensor 69 may be omitted. In this case, the control device 50 may also calculate the supply amount of the external air OA based on the fan speed and the operating current value of the air supply fan 40.

[0087] In the hypoxic air supply system 10, the indoor space A1 is ventilated in the second way by the air supply fan 40, so that the indoor space A1 is kept at a positive pressure, thereby suppressing the intrusion of unexpected air into the indoor space A1 (external disturbance), thereby suppressing the change of the oxygen concentration in the indoor space A1. In addition, the control device 50 can also adjust the supply amount of the external air OA according to the detection value of the carbon dioxide sensor 58 (i.e., the carbon dioxide concentration of the indoor space A1). In this case, the control device 50 adjusts the supply amount of the external air OA to the indoor space A1 by turning the air supply fan 40 on and off or changing the fan speed of the air supply fan 40.

[0088] The control device 50 can individually control the operation of each connected hypoxic air supply unit 20. When the control device 50 detects that a part of the hypoxic air supply units 20 has failed, the control device 50 stops the hypoxic air supply unit 20 that has failed, and continues to supply the hypoxic air LA using only the other hypoxic air supply units 20 except the hypoxic air supply unit 20 that has failed. Therefore, in the hypoxic air supply system 10 of the present embodiment, even if a part of the hypoxic air supply units 20 has failed, the operation of the hypoxic air supply system 10 can be continued.

[0089] like Figure 1 , Figure 4A to Figure 4CAs shown, the hypoxic air supply system 10 includes a first isolation valve 64, a second isolation valve 65, and a third isolation valve 66. The first isolation valve 64 is a valve provided on the external air supply pipe 12 through which the external air OA supplied to the hypoxic air supply unit 20 flows, and it is capable of switching the supply and stop of the external air OA from the first muffler 61 to each hypoxic air supply unit 20 individually. The second isolation valve 65 is a valve provided on the hypoxic air supply pipe 13 through which the hypoxic air LA generated in the hypoxic air supply unit 20 flows, and it is capable of switching the supply and stop of the hypoxic air LA from each hypoxic air supply unit 20 to the second muffler 62 individually. The third isolation valve 66 is a valve provided on the high oxygen air supply pipe 14 through which the high oxygen air HA generated in the hypoxic air supply unit 20 flows, and it is capable of switching the supply and stop of the high oxygen air HA from each hypoxic air supply unit 20 to the third muffler 63 individually.

[0090] In the hypoxic air supply system 10, when a hypoxic air supply unit 20 fails, the isolation valves 64, 65, and 66 corresponding to the failed hypoxic air supply unit 20 are closed, so that the failed hypoxic air supply unit 20 can be replaced while continuing the operation of the hypoxic air supply system 10. Therefore, in the hypoxic air supply system 10 of the present embodiment, even if a part of the hypoxic air supply units 20 fails, the hypoxic air supply system 10 can be repaired without stopping the supply of the hypoxic air LA (the provision of the hypoxic environment).

[0091] The hypoxic air supply system 10 described above includes: a plurality of hypoxic air supply units 20 that generate hypoxic air LA containing oxygen having a concentration lower than that of oxygen in the air and supply the generated hypoxic air LA to the indoor space A1; an air supply fan 40 that supplies the external air OA to the indoor space A1; an oxygen sensor 57 that detects the oxygen concentration in the indoor space A1; a carbon dioxide sensor 58 that detects the carbon dioxide concentration in the indoor space A1; and a control device 50 that controls the operation of the hypoxic air supply unit 20 and the air supply fan 40. According to the hypoxic air supply system 10 of the above structure, even if any one of the plurality of hypoxic air supply units 20 fails, the supply of the hypoxic air LA can be continued using the other hypoxic air supply units 20. Therefore, according to the hypoxic air supply system 10, even if a part of the plurality of hypoxic air supply units 20 fails, the supply amount of the hypoxic air LA required for maintaining the hypoxic environment can be ensured, thereby continuing to provide the hypoxic environment.

[0092] (About calibration of oxygen sensor and carbon dioxide sensor) The hypoxic air supply system 10 of the present disclosure has two oxygen sensors 57 (a first oxygen sensor 57a and a second oxygen sensor 57b). Therefore, in the hypoxic air supply system 10, the control device 50 can compare the detection value of the first oxygen sensor 57a with the detection value of the second oxygen sensor 57b.

[0093] During the operation of the hypoxic air supply system 10, when the detection value of the oxygen sensor 57 presents an abnormal value, the control device 50 compares the detection values ​​of the oxygen sensors 57a and 57b, thereby being able to distinguish whether the abnormal value is caused by an abnormality occurring in the indoor space A1 or by a failure of the oxygen sensor 57. The control device 50 determines whether the oxygen sensor 57 has a failure based on the comparison result of the detection values ​​of the oxygen sensors 57a and 57b, the difference between the detection values ​​of the oxygen sensors 57a and 57b and the reference value, the change status of the detection value when the abnormal value is present, and the like.

[0094] The hypoxic air supply system 10 of the present disclosure has two carbon dioxide sensors 58 (a first carbon dioxide sensor 58a and a second carbon dioxide sensor 58b). Therefore, in the hypoxic air supply system 10, the control device 50 can compare the detection value of the first carbon dioxide sensor 58a with the detection value of the second carbon dioxide sensor 58b.

[0095] During the operation of the hypoxic air supply system 10, when the detection value of the carbon dioxide sensor 58 presents an abnormal value, the control device 50 compares the detection values ​​of the carbon dioxide sensors 58a and 58b, thereby being able to determine whether the abnormal value is caused by an abnormality occurring in the indoor space A1 or by a failure of the carbon dioxide sensor 58. The control device 50 determines whether the carbon dioxide sensor 58 has a failure based on the comparison result of the detection values ​​of the carbon dioxide sensors 58a and 58b, the difference between the detection values ​​of the carbon dioxide sensors 58a and 58b and the reference value, the change in the detection value when the abnormal value is present, and the like.

[0096] Therefore, in the hypoxic air supply system 10, by having two oxygen sensors 57 and two carbon dioxide sensors 58, the operation of the hypoxic air supply unit 20 can be accurately controlled, the oxygen concentration in the indoor space A1 can be reliably maintained at the desired hypoxic state, and the oxygen concentration and carbon dioxide concentration in the indoor space A1 can be reliably monitored.

[0097] In addition, in the hypoxic air supply system 10, by having two oxygen sensors 57 and two carbon dioxide sensors 58, the oxygen sensors 57 and the carbon dioxide sensors 58 can be calibrated with high accuracy. In the hypoxic air supply system 10, when calibrating the oxygen sensors 57 and the carbon dioxide sensors 58, the hypoxic air supply unit 20 is stopped and the air supply fan 40 is operated, so that only the external air OA is supplied to the unmanned indoor space A1. In this case, the oxygen concentration reaches the same concentration as the oxygen concentration in normal air (about 21%), and the carbon dioxide concentration in the indoor space A1 reaches the same concentration as the carbon dioxide concentration in normal air (about 300 to 400 ppm).

[0098] In the hypoxic air supply system 10, the oxygen concentration of normal air (about 21%) is used as a calibration reference value, and the two oxygen sensors 57a and 57b are calibrated by comparing it with the actual measured value. In the hypoxic air supply system 10, the carbon dioxide concentration of normal air (about 300 to 400 ppm) is used as a calibration reference value, and the two carbon dioxide sensors 58a and 58b are calibrated by comparing it with the actual measured value. In this way, in the structure where there are two oxygen sensors 57 and two carbon dioxide sensors 58, there is an object to compare the deviation of the measured value relative to the calibration reference value, so it is easy to distinguish the deterioration and abnormality of each sensor 57 and 58. In addition, the oxygen sensor 57 and the carbon dioxide sensor 58 used in the hypoxic air supply system 10 can also be a sensor having a self-calibration function.

[0099] (About business plan) Figure 6 The diagram shows an example of a business plan of a store to which the hypoxic air supply system is applied and an example of an operation plan of the hypoxic air supply system. Figure 6 The operation plan shown is running. Figure 6 As shown, the operation plan of the hypoxic air supply system 10 is set according to the business plan of the store to which the hypoxic air supply system 10 is applied. In the present embodiment, an example is given in which the business hours of the store in a day are 12 hours from 10 am to 10 pm. In the present embodiment, an example is given in which the store is closed except for the period from 10 am to 10 pm. In addition, the business plan of the store to which the hypoxic air supply system is applied is not limited to the plan shown in the present embodiment. The business plan of the store may, for example, be a plan to open 24 hours a day and close the store every few days. In addition, in the hypoxic air supply system 10 in this case, the preparation operation mode and the end operation mode described later are executed at the time of closing the store every few days, and the execution of the business operation mode is continued during business.

[0100] (About the operation plan) As shown in FIG5 , the operation plan of the hypoxic air supply system 10 includes states of preparation operation, business operation, end operation, and standby. In the following description, the operation mode of the hypoxic air supply system 10 in preparation operation is referred to as preparation operation mode, the operation mode of the hypoxic air supply system 10 in business operation is referred to as business operation mode, and the operation mode of the hypoxic air supply system 10 in end operation is referred to as end operation mode. In the following description, the mode of the hypoxic air supply system 10 in standby is referred to as standby mode.

[0101] The preparation operation mode is an operation mode for changing the oxygen concentration of the indoor space A1 from the same oxygen concentration as the outdoor space A3 to an oxygen concentration suitable for business (low oxygen concentration) before the start of business hours. In the low oxygen air supply system 10 of the present embodiment, for example, the period from 7:00 a.m. to 8:30 a.m. is the period for executing the preparation operation mode. In addition, in the present embodiment, the preparation operation mode is terminated at the moment just before the start of business hours, but in the low oxygen air supply system 10, the preparation operation mode can also be continued until the start time of business hours.

[0102] The business operation mode is an operation mode for maintaining the oxygen concentration of the indoor space A1 at an oxygen concentration suitable for business (a low oxygen concentration of about 16%) during business hours. In the hypoxic air supply system 10 of the present embodiment, for example, the period from 8:30 a.m. to 10 p.m. is the period for executing the business operation mode. In addition, in the hypoxic air supply system 10, as shown in the present embodiment, a plan for switching from the preparation operation mode to the business operation mode at a time before the start time of business hours can also be adopted.

[0103] The end operation mode is an operation mode for changing the oxygen concentration of the indoor space A1 from a low oxygen concentration suitable for business to the same oxygen concentration as the outdoor space A3 at the time after the business hours are over. In the low oxygen air supply system 10 of this embodiment, the period from 10 pm to 11 pm is the period for executing the end operation mode.

[0104] The standby mode is a mode in which the hypoxic air LA is not supplied to the indoor space A1 during the store closing time (before and after business hours) and the oxygen concentration of the indoor space A1 is maintained at the same level as that of the outdoor space A3. In other words, the standby mode is a mode in which the indoor space A1 is maintained at a normal oxygen concentration. In the hypoxic air supply system 10 shown in this embodiment, the period from 11 pm to 7 am the next day is the period for executing the standby mode.

[0105] (About the preparation operation mode) Figure 7 Graph showing changes in oxygen concentration, carbon dioxide concentration, the number of operating low oxygen air supply units and air supply fans, and the number of users of the low oxygen air supply system during the preparatory operation. Figure 7 As shown, the preparation operation mode is an operation mode that changes the oxygen concentration in the indoor space A1 from the same state as the oxygen concentration in the outdoor space A3 to a low oxygen state (about 16%). In the present embodiment, the number of people in the indoor space A1 during the execution of the preparation operation mode is assumed to be "0". In the preparation operation mode, all (four) low oxygen air supply units 20 included in the integrated unit 11 are operated to supply low oxygen air LA to the indoor space A1. In the preparation operation mode, the supply fan 40 is stopped. Thus, in the preparation operation mode, low oxygen air LA is supplied to the indoor space A1 without ventilating the indoor space A1 and without oxygen consumption and carbon dioxide production in the indoor space A1. By executing the preparation operation mode, the low oxygen air supply system 10 can rapidly reduce the oxygen concentration in the indoor space A1 to a low oxygen state. As Figure 7 As shown, in the hypoxic air supply system 10, by executing the preparation operation mode, the oxygen concentration in the indoor space A1 of about 20-21% at the start time point can be quickly reduced to a hypoxic state of about 16%. In addition, in the preparation operation mode, after the oxygen concentration in the indoor space A1 reaches the desired hypoxic state (about 16%), the number of operating units of the hypoxic air supply unit 20 is changed from 4 to 0.

[0106] In addition, in the hypoxic air supply system 10 of the present disclosure, the control device 50 can calculate the airtightness (C value) of the indoor space A1 based on the changes in the oxygen concentration and the carbon dioxide concentration when the preparation operation mode is executed. In the hypoxic air supply system 10, by confirming the airtightness (C value) of the indoor space A1 every day, it is possible to detect the reduction in the airtightness of the indoor space A1 caused by the deterioration of the sealing part, the deterioration of the building itself, etc.

[0107] (About business operation model) Figure 8 This is a graph showing changes in oxygen concentration, carbon dioxide concentration, the number of operating low oxygen air supply units and air supply fans, and the number of users of the low oxygen air supply system during business operation. Figure 8As shown, the business operation mode is an operation mode for maintaining the oxygen concentration in the indoor space A1 in a low oxygen state (about 16%). In the present embodiment, the number of people in the indoor space A1 during the execution of the business operation mode is assumed to be "0-1" person. In the business operation mode, the number of operating units of each low oxygen air supply unit 20 included in the integrated unit 11 is controlled within the range of 0 to 4 units according to the carbon dioxide concentration in the indoor space A1. The integrated unit 11 supplies the low oxygen air LA required to maintain the low oxygen state (about 16%) to the indoor space A1. In the business operation mode, the air supply fan 40 is on-off controlled according to the carbon dioxide concentration in the indoor space A1. As shown in FIG. Figure 8 As shown, in the hypoxic air supply system 10, by executing the business operation mode, the oxygen concentration in the indoor space A1 can be maintained at a hypoxic state of about 16%, and the increase in the carbon dioxide concentration in the indoor space A1 can be suppressed. In addition, in the hypoxic air supply system 10 of the present disclosure, when the number of hypoxic air supply units 20 is controlled, the control device 50 considers the cumulative operation time of each hypoxic air supply unit 20, and selects the hypoxic air supply unit 20 to be operated and stopped in a manner that averages the cumulative operation time of the hypoxic air supply unit 20.

[0108] (About End Operation Mode) Fig. 9 Graph showing changes in oxygen concentration, carbon dioxide concentration, the number of operating low oxygen air supply units and air supply fans, and the number of users of the low oxygen air supply system during the end of operation. Fig. 9 As shown, the end operation mode is an operation mode that changes the oxygen concentration in the indoor space A1 from a low oxygen state (about 16%) to a state that is the same as the oxygen concentration in the outdoor space A3. In the present embodiment, the number of people in the indoor space A1 during the execution of the end operation mode is assumed to be "0". In the end operation mode, all the low oxygen air supply units 20 included in the integrated unit 11 are stopped, thereby stopping the supply of low oxygen air LA into the indoor space A1. In the end operation mode, the air supply fan 40 is always turned on, and the external air OA is supplied to the indoor space A1 for ventilation. As shown in FIG. Fig. 9 As shown, in the hypoxic air supply system 10 of the present disclosure, by executing the end operation mode, the oxygen concentration in the indoor space A1 can be increased from about 16% to about 20-21%. In addition, in the hypoxic air supply system 10 of the present disclosure, by executing the end operation mode, the carbon dioxide concentration in the indoor space A1 can be reduced from about 3000ppm to about 300-400ppm.

[0109] (About standby mode) like Figure 7 and Fig. 9As shown, the standby mode is a mode in which the oxygen concentration in the indoor space A1 is maintained at the same level as the oxygen concentration in the outdoor space A3 (about 20-21%). In this embodiment, the number of people in the indoor space A1 in the standby mode is assumed to be "0". In the standby mode, all the low oxygen air supply units 20 included in the integrated unit 11 are stopped, thereby stopping the supply of low oxygen air LA to the indoor space A1. In the standby mode, the air supply fan 40 is turned off. Fig. 9 As shown, in the low oxygen air supply system 10 of the present disclosure, in the standby mode, the oxygen concentration in the indoor space A1 can be maintained at about 20 to 21%, and the carbon dioxide concentration in the indoor space A1 can be maintained at about 300 to 400 ppm.

[0110] In the hypoxic air supply system 10 of the present disclosure, the control device 50 operates the hypoxic air supply system 10 according to the operation plan, so that a hypoxic environment can be provided to the indoor space A1 of the store according to the store's operation plan. In the hypoxic air supply system 10, even if a part of the hypoxic air supply units 20 fails, the hypoxic environment can be continued by operating only the remaining hypoxic air supply units 20 that have not failed. Therefore, when the hypoxic air supply system 10 of the present disclosure is used, when a part of the hypoxic air supply units 20 fails, there is no need to temporarily suspend the store.

[0111] (About operation control) Fig.10 is a diagram showing the periodic variation of the air supply volume and air supply pressure of the hypoxic air supply unit. Fig.10 As shown, the hypoxic air supply unit 20 of the present embodiment has a characteristic (operation cycle) in which the supply amount and supply pressure of the hypoxic air LA vary at a predetermined period P. Fig.10 , which shows the situation where the air supply volume and air supply pressure reach peak values ​​at times Tp1 to Tp4. The times when the air supply volume and air supply pressure of the hypoxic air supply unit 20 reach their peak values ​​are roughly consistent. In addition, in the following description, the time when the air supply volume and air supply pressure reach their peak values ​​is also referred to as the peak time Tp. In the hypoxic air supply system 10, when the peak times Tp of multiple hypoxic air supply units 20 are consistent, the supply of hypoxic air LA from multiple hypoxic air supply units 20 overlaps at the peak time Tp, thereby increasing the fluctuation range of the supply volume of the hypoxic air LA. In this case, the maximum value of the power value (current × voltage) of the hypoxic air supply system 10 increases, and the noise generated from the hypoxic air supply system 10 also increases.

[0112] In the hypoxic air supply system 10 of the present disclosure, the control device 50 adjusts the operation cycle of each of the hypoxic air supply units 20 in operation so that the peak times Tp of the hypoxic air supply units 20 are shifted from each other.

[0113] In this case, the time when the power value (current × voltage) of each hypoxic air supply unit 20 reaches the maximum is staggered, so that the power consumption can be averaged. In addition, in this case, the time when the supply amount of hypoxic air LA and high oxygen air HA from each hypoxic air supply unit 20 reaches the maximum is staggered, so the maximum supply amount of hypoxic air LA and high oxygen air HA can be reduced, thereby achieving the average supply amount of hypoxic air LA and high oxygen air HA. In addition, thereby, the pipe diameters of the second silencer 62, the third silencer 63, and the first silencer 61 can be reduced, wherein the second silencer 62 is for the convergence of the hypoxic air LA supplied from each hypoxic air supply unit 20, the third silencer 63 is for the convergence of the high oxygen air HA supplied from each hypoxic air supply unit 20, and the first silencer 61 is for the convergence of the external air OA supplied to each hypoxic air supply unit 20. In this case, by reducing the maximum supply amounts of the hypoxic air LA and the high oxygen air HA, it is possible to suppress noise generated from the hypoxic air supply unit 20 when the hypoxic air LA and the high oxygen air HA are discharged and when the outside air OA is inhaled.

[0114] The hypoxic air supply unit 20 described above has an adsorbent material X that can adsorb and desorb nitrogen. The hypoxic air supply unit 20 has: a first adsorption cylinder 25a and a second adsorption cylinder 25b that accommodate the adsorbent material X; a compressor 22 that supplies air to either the first adsorption cylinder 25a or the second adsorption cylinder 25b; a vacuum pump 23 that exhausts air from the other of the first adsorption cylinder 25a and the second adsorption cylinder 25b; and a first switching valve 24a and a second switching valve 24b that switch the air supply target of the compressor 22 to either the first adsorption cylinder 25a or the second adsorption cylinder 25b, and switch the exhaust source of the vacuum pump 23 to the other of the first adsorption cylinder or the second adsorption cylinder. In the hypoxic air supply unit 20, the air supply target of the compressor 22 and the exhaust source of the vacuum pump 23 are switched by the first switching valve 24a and the second switching valve 24b. In the hypoxic air supply unit 20 of the above structure, when the flow path is switched by the first switching valve 24a and the second switching valve 24b, the air supply amount of the compressor 22 and the exhaust amount of the vacuum pump 23 are periodically changed. Therefore, in the hypoxic air supply system 10, the control device 50 controls the operation of each hypoxic air supply unit 20 so that the peak time Tp of each hypoxic air supply unit 20 is different.

[0115] In the hypoxic air supply system 10 having the above-described configuration, it is possible to suppress power consumption and noise generation, and to equalize the supply amounts of the hypoxic air LA and the high-oxygen air HA.

[0116] [Effects of the Embodiments] (1) The hypoxic air supply system 10 of the above-mentioned embodiment includes: a plurality of hypoxic air supply units 20, which generate hypoxic air LA containing oxygen having a concentration lower than the oxygen concentration in the air and supply the generated hypoxic air LA to the indoor space A1; an air supply fan 40 that supplies external air OA to the indoor space A1; an oxygen sensor 57 that detects the oxygen concentration in the indoor space A1; and a control device 50 that controls the operation of the hypoxic air supply units 20 and the air supply fan 40.

[0117] According to the hypoxic air supply system 10, even if any one of the plurality of hypoxic air supply units 20 fails, the supply of the hypoxic air LA can be continued using the other hypoxic air supply units 20. Therefore, according to the hypoxic air supply system 10 of the present disclosure, even if a part of the plurality of hypoxic air supply units 20 fails, the hypoxic environment can be continuously provided.

[0118] (2) In the hypoxic air supply system 10 of the above-mentioned embodiment, each hypoxic air supply unit 20 has: an adsorbent material X that can adsorb nitrogen (or oxygen) contained in the air and desorb the adsorbed nitrogen (or oxygen); a first adsorbent cylinder 25a and a second adsorbent cylinder 25b that accommodate the adsorbent material X; a compressor 22 that supplies air to either the first adsorbent cylinder 25a or the second adsorbent cylinder 25b, or a first open valve 37 that opens one direction to the atmosphere; a vacuum pump 23 that exhausts air from the other of the first adsorbent cylinder 25a and the second adsorbent cylinder 25b, or a second open valve 38 that opens the other direction to the atmosphere; and a first switching valve 24a and a second switching valve 24b, which switches the air supply target of the compressor 22 or the opening target of the first opening valve 37 to one of the first adsorption cylinder 25a or the second adsorption cylinder 25b, and switches the exhaust source of the vacuum pump 23 or the opening source of the second opening valve to the other of the first adsorption cylinder or the second adsorption cylinder. The control device 50 controls the operation of each low oxygen air supply unit 20 in a manner that the first peak moment Tp when the exhaust volume from the vacuum pump 23 or the second opening valve 38 of the first low oxygen air supply unit 20 reaches a peak and the second peak moment Tp when the exhaust volume from the vacuum pump 23 or the second opening valve 38 of the second low oxygen air supply unit 20 reaches a peak are different.

[0119] According to the hypoxic air supply system 10, it is possible to suppress the power consumption and noise generated by the hypoxic air supply system 10. The supply amount of the hypoxic air LA in the hypoxic air supply system 10 can be averaged.

[0120] (3) The hypoxic air supply system 10 of the above embodiment further includes the carbon dioxide sensor 58 for detecting the carbon dioxide concentration in the indoor space A1.

[0121] According to the hypoxic air supply system 10 , the carbon dioxide concentration in the indoor space A1 can be managed, and the operation of the hypoxic air supply system 10 can be controlled based on the carbon dioxide concentration.

[0122] (4) The hypoxic air supply system 10 of the above-described embodiment performs the second type of ventilation of the indoor space A1 by the air supply fan 40 .

[0123] According to the low oxygen air supply system 10, it is possible to suppress the fluctuation of the oxygen concentration in the indoor space A1.

[0124] (5) In the hypoxic air supply system 10 of the above embodiment, the control device 50 can control each hypoxic air supply unit 20 individually, and the hypoxic air supply system 10 further includes a second isolation valve 65 on the supply path of the hypoxic air LA supplied from each hypoxic air supply unit 20.

[0125] According to the hypoxic air supply system 10 , when any of the hypoxic air supply units 20 fails, the operation of the hypoxic air supply system 10 can be continued using another hypoxic air supply unit 20 , and the failed hypoxic air supply unit 20 can be replaced.

[0126] (6) The hypoxic air supply system 10 of the above embodiment further includes a third pressure sensor 67 for detecting the supply pressure of the hypoxic air. The control device 50 calculates the supply amount of the hypoxic air LA based on the detection value of the third pressure sensor 67.

[0127] According to the hypoxic air supply system 10 , there is no need to separately provide a flow sensor for measuring the supply amount of the hypoxic air LA.

[0128] (7) The hypoxic air supply system 10 of the above embodiment includes two oxygen sensors 57 (the first oxygen sensor 57a and the second oxygen sensor 57b), and two carbon dioxide sensors 58 (the first carbon dioxide sensor 58a and the second carbon dioxide sensor 58b).

[0129] According to the hypoxic air supply system 10, it is possible to distinguish whether an abnormality has occurred in the indoor space A1, that is, the oxygen concentration exceeds a predetermined range and becomes an excessively hypoxic state, or whether an abnormality has occurred in the detection values ​​of the sensors 57 and 58. By comparing the detection values ​​of the sensors 57 and 58, the oxygen sensor 57 and the carbon dioxide sensor 58 can be calibrated.

[0130] (8) The hypoxic air supply system 10 of the above embodiment further includes the first muffler 61 . The hypoxic air supply system 10 merges the hypoxic air LA supplied from the first hypoxic air supply unit 20 and the hypoxic air LA supplied from the second hypoxic air supply unit 20 at the first muffler 61 .

[0131] According to the hypoxic air supply system 10, the number of silencers can be reduced compared to the case where a silencer is provided for each hypoxic air supply unit 20. The noise generated from the hypoxic air supply system 10 can be effectively suppressed by a small number of silencers.

[0132] (9) The hypoxic air supply system 10 of the above embodiment further includes a frame 70 . Each of the hypoxic air supply units 20 in the hypoxic air supply system 10 is mounted on the frame 70 .

[0133] According to the hypoxic air supply system 10 , installation of the hypoxic air supply system 10 becomes easy.

[0134] (10) In the hypoxic air supply system 10 of the above embodiment, each hypoxic air supply unit 20 also generates hyperoxia air containing oxygen having a concentration higher than the oxygen concentration in the air, and supplies the hyperoxia air HA to the hyperoxia chamber A4. The hypoxic air supply unit 20 further includes a flow rate regulating valve 30 for regulating the supply amount of the hyperoxia air HA. The control device 50 regulates the opening of the flow rate regulating valve 30 to regulate the supply amount of the hyperoxia air HA.

[0135] According to the hypoxic air supply system 10, the flow rate of the hypoxic air LA can be adjusted by adjusting the flow rate of the hyperoxic air HA. The size of the flow rate control valve 30 provided in the piping system of the hyperoxic air HA is smaller than the size of the flow rate control valve provided in the piping system of the hypoxic air LA. Therefore, the flow rate of the hypoxic air LA can be adjusted by the flow rate control valve 30 of a smaller size, so that the cost spent on the flow rate control valve 30 can be reduced.

[0136] (11) The hypoxic air supply system 10 of the above embodiment further includes a third oxygen sensor 57c disposed in the high oxygen chamber A4. The control device 50 calculates the supply capacity of the hypoxic air LA supplied to the indoor space A1 based on the detection value of the third oxygen sensor 57c disposed in the high oxygen chamber A4.

[0137] In this case, for the indoor space A1, the supply capacity of the hypoxic air LA calculated based on the detection values ​​of the third pressure sensor 67, each oxygen sensor 57a, 57b, etc. and the supply capacity of the hypoxic air LA calculated based on the detection value of the third oxygen sensor 57c arranged in the high oxygen chamber A4, etc. can be compared. In this way, it is easy to confirm whether the hypoxic air supply system 10 is functioning normally.

[0138] Although the embodiments have been described above, it should be understood that various changes in form and details can be made without departing from the spirit and scope of the claims. Explanation of symbols

[0139] 10. Hypoxic air supply system; 20 hypoxic air supply unit; 20A Unit 1 (hypoxic air supply unit); 20B Unit 2 (hypoxic air supply unit); 20C Unit 3 (hypoxic air supply unit); 22 compressor; 23 vacuum pump; 24 flow path switching valve (switching valve); 24a first switching valve; 24b second switching valve; 25 adsorption cylinder; 25a first adsorption cylinder; 25b second adsorption cylinder; 30 flow control valve; 37 first opening and closing valve; 38 second on-off valve; 40 air supply fan; 50 control device (control unit); 57 oxygen sensor; 57a first oxygen sensor; 57b second oxygen sensor; 57c third oxygen sensor; 58 Carbon dioxide sensor; 58a a first carbon dioxide sensor; 58b a second carbon dioxide sensor; 62 first silencer (silencer); 65 second isolation valve (isolation valve); 67 third pressure sensor (pressure sensor); 70 racks; A1 indoor space (first object space); A4 hyperoxia chamber (second object space); LA hypoxic air; HA high oxygen air; X adsorption material; Tp peak time (first time, second time).

Claims

1. A hypoxic air supply system (10), characterized in that: include: a first hypoxic air supply unit (20A) and a second hypoxic air supply unit (20B), the first hypoxic air supply unit and the second hypoxic air supply unit generating hypoxic air (LA) and supplying the generated hypoxic air (LA) to a first target space (A1), the hypoxic air containing oxygen having a concentration lower than that of oxygen in air; a fan (40) for supplying external air to the first target space (A1); an oxygen sensor (57) for detecting the oxygen concentration in the first target space (A1); and A control unit (50) controls the operations of the first hypoxic air supply unit (20A), the second hypoxic air supply unit (20B), and the fan (40).

2. The hypoxic air supply system (10) according to claim 1, characterized in that: The first hypoxic air supply unit (20A) and the second hypoxic air supply unit (20B) have: Adsorbent material (X), the adsorbent material being capable of adsorbing nitrogen or oxygen contained in the air and desorbing the adsorbed nitrogen or oxygen; a first adsorbent cylinder (25a) and a second adsorbent cylinder (25b) storing the adsorbent material (X); a compressor (22) for supplying air to any one of the first adsorbent cylinder (25a) and the second adsorbent cylinder (25b) or a first opening valve (37) for opening the first adsorbent cylinder to the atmosphere; and a vacuum pump (23) for exhausting air from the other of the first adsorbent cylinder (25a) and the second adsorbent cylinder (25b). or a second open valve (38) that opens the other direction to the atmosphere; and a switching valve (24), the switching valve switching the air supply target of the compressor (22) or the opening target of the first open valve (37) to the first adsorption cylinder (25a) or the second adsorption cylinder (25b), and switching the exhaust source of the vacuum pump (23) or the opening source of the second open valve (38) to the first adsorption cylinder (25a) or the second adsorption cylinder (25b) that is not the air supply target of the compressor (22) or the opening target of the first open valve (37), The control unit (50) controls the operation of the first hypoxic air supply unit (20A) and the second hypoxic air supply unit (20B) in a manner such that a first moment (Tp) and a second moment (Tp) are different, the first moment being the moment when the exhaust volume from the vacuum pump (23) of the first hypoxic air supply unit (20A) or the second open valve (38) reaches a peak, and the second moment being the moment when the exhaust volume from the vacuum pump (23) of the second hypoxic air supply unit (20B) or the second open valve (38) reaches a peak.

3. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The hypoxic air supply system further includes a carbon dioxide sensor (58) for detecting a carbon dioxide concentration in the first target space (A1).

4. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The fan (40) performs second ventilation on the target space (A1).

5. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The control unit (50) is capable of independently controlling the first hypoxic air supply unit (20A) and the second hypoxic air supply unit (20B). The hypoxic air supply system further includes isolation valves (65) on a supply path of the hypoxic air (LA) supplied from the first hypoxic air supply unit (20A) and on a supply path of the hypoxic air (LA) supplied from the second hypoxic air supply unit (20B), respectively.

6. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The hypoxic air supply system further includes a pressure sensor (67) for detecting the supply pressure of the hypoxic air (LA). The control unit (50) calculates a supply amount of low oxygen air (LA) based on a detection value of the pressure sensor (67).

7. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: There are two or more oxygen sensors (57) and there are two or more carbon dioxide sensors (58).

8. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The hypoxic air supply system further comprises a muffler (62). The hypoxic air (LA) supplied from the first hypoxic air supply unit (20A) and the hypoxic air (LA) supplied from the second hypoxic air supply unit (20B) merge at the muffler (62).

9. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The hypoxic air supply system further comprises a frame (70), The first hypoxic air supply unit (20A) and the second hypoxic air supply unit (20B) are installed on the frame (70).

10. The hypoxic air supply system (10) according to claim 1 or 2, characterized in that: The first hypoxic air supply unit (20A) and the second hypoxic air supply unit (20B) further generate hyperoxic air (HA) containing oxygen having a concentration higher than that of oxygen in air, and supply the hyperoxic air (HA) to the second target space (A4), and further include a flow rate regulating valve (30) for regulating the supply amount of the hyperoxic air (HA). The control unit (50) adjusts the supply amount of the enriched oxygen air (HA) by adjusting the opening degree of the flow rate regulating valve (30).

11. The hypoxic air supply system (10) according to claim 10, characterized in that: The hypoxic air supply system further arranges the oxygen sensor (57) in the second target space (A4). The control unit (50) calculates a supply capacity of low oxygen air (LA) supplied to the first target space (A1) based on a detection value of the oxygen sensor (57) of the second target space (A4).

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