Air quality improvement device

Abstract

To provide a technique capable of adjusting at least one of oxygen concentration and carbon dioxide concentration of air to be discharged according to a state of a user.SOLUTION: An air quality improvement device 10 comprises: adsorption parts 12, 13 which adsorb an adsorbing object being at least one of nitrogen and carbon dioxide; a pressurization part 14 which supplies air to a pressurization object flow passage 11C provided with the adsorption parts 12, 13 to apply pressure; a control part 27 which controls the pressurization part 14; and a biosensor 24 which measures biological information on a user 41 who uses the air quality improvement device 10. The control part 27 sets target pressure based upon the biological information measured by the biosensor 24 in air improvement operation, and controls the pressurization part 14 so that the pressure in the pressurization object flow passage 11C reaches the target pressure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an air quality improvement device. [Background technology]

[0002] Patent Document 1 discloses an air conditioning control device for an in-vehicle air conditioner. This air conditioning control device can change the oxygen concentration in the air released into the vehicle interior using an air volume adjustment mechanism. Furthermore, this air conditioning control device is equipped with a carbon dioxide reduction module that reduces carbon dioxide. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-315543 Summary of the Invention [Problem to be solved by the invention]

[0004] The oxygen concentration required to improve the user's condition varies from user to user. However, this point is not taken into consideration in Patent Document 1. Furthermore, from the perspective of improving the user's condition, the target to be adjusted may be the carbon dioxide concentration instead of the oxygen concentration.

[0005] The present disclosure aims to provide a technology that can adjust at least one of the oxygen concentration and the carbon dioxide concentration of the exhausted air depending on the condition of the user. [Means for solving the problem]

[0006] The air quality improvement device of the present disclosure comprises: an adsorption unit that adsorbs an adsorption target, which is at least one of nitrogen and carbon dioxide; a pressurizing unit that supplies air to a flow path to be pressurized in which the adsorption unit is provided, to pressurize the flow path; a control unit that controls the pressure unit, An air quality improvement device that performs an air quality improvement operation of adsorbing the adsorption target of the air taken in from the inlet by the adsorption unit and discharging the air after the adsorption target has been adsorbed by the adsorption unit from the outlet, further comprising a biosensor that measures biological information of a user who uses the air quality improvement device, In the air quality improvement operation, the control unit sets a target pressure based on the biological information measured by the biosensor, and controls the pressurizing unit so that the pressure in the pressurized target flow path becomes the target pressure.

Advantages of the Invention

[0007] According to the present disclosure, at least one of the oxygen concentration and the carbon dioxide concentration of the discharged air can be adjusted according to the state of the user.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0009] [Description of Embodiments of the Present Disclosure] Hereinafter, embodiments of the present disclosure will be listed and exemplified.

[0010] 〔1〕An adsorption unit that adsorbs an adsorption target that is at least one of nitrogen and carbon dioxide, A pressurizing unit that supplies and pressurizes air to a pressurized target flow path in which the adsorption unit is provided, A control unit that controls the pressurizing unit, and An air quality improvement device that performs an air quality improvement operation of adsorbing the adsorption target of the air taken in from the inlet by the adsorption unit and discharging the air after the adsorption target has been adsorbed by the adsorption unit from the outlet, Furthermore, it is provided with a biosensor that measures the biological information of a user who uses the air quality improvement device. In the air quality improvement operation, the control unit sets a target pressure based on the biological information measured by the biosensor, and controls the pressurizing unit so that the pressure in the pressurization target flow path becomes the target pressure. Air quality improvement device.

[0011] The above air quality improvement device can improve the user's condition by supplying air with reduced nitrogen and / or carbon dioxide and increased oxygen concentration to the user. Furthermore, the air quality improvement device can adjust the adsorption amount of the adsorption target by the adsorption unit by controlling the pressurizing unit so that the pressure in the pressurization target flow path becomes a pressure corresponding to the biological information of the user. That is, the above air quality improvement device can adjust at least one of the oxygen concentration and the carbon dioxide concentration of the air discharged from the outlet according to the biological information of the user.

[0012] (2) The control unit determines whether the biological information measured by the biosensor is normal at a predetermined timing after the start of the air quality improvement operation. When it is determined that the biological information is not normal, it is determined that the adsorption unit is deteriorated. The air quality improvement device according to (1).

[0013] The above air quality improvement device can determine that the adsorption unit is deteriorated when the biological information does not become normal even after a certain amount of time has elapsed since the start of the air quality improvement operation.

[0014] (3) It is provided with an oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit. The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide. When the control unit determines at the predetermined timing that the biological information is not normal and determines that the oxygen concentration measured by the oxygen concentration measurement unit is equal to or higher than a reference value, it is determined that the second adsorbent is deteriorated. The air quality improvement device according to [2].

[0015] When the biological information does not become normal even though the oxygen concentration is equal to or higher than the reference value at a point in time after a certain period of time has elapsed since the start of the air quality improvement operation, it can be determined that the second adsorbent is deteriorated.

[0016] 〔4〕Comprising an oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit, The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide. When the control unit determines that the biological information is abnormal at the predetermined timing and determines that the oxygen concentration measured by the oxygen concentration measurement unit is less than the reference value, it determines that at least the first adsorbent among the first adsorbent and the second adsorbent is deteriorated. The air quality improvement device according to [2] or [3].

[0017] When the biological information does not become normal and the oxygen concentration is less than the reference value at a point in time after a certain period of time has elapsed since the start of the air quality improvement operation, it can be determined that at least the first adsorbent is deteriorated.

[0018] 〔5〕Comprising an oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit, The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide. When the control unit determines that the biological information is normal at the predetermined timing and determines that the oxygen concentration measured by the oxygen concentration measurement unit is equal to or higher than the reference value, the air quality improvement operation is stopped. The air quality improvement device according to any one of [2] to [4].

[0019] When a certain amount of time has elapsed since the start of the air quality improvement operation, if the biological information is normal and the oxygen concentration is equal to or higher than the reference value, the air quality improvement operation can be stopped to save power.

[0020] [Details of Embodiments of the Present Disclosure] <First Embodiment> FIG. 1 discloses an air quality improvement device 10 according to the first embodiment. The air quality improvement device 10 is mounted on, for example, a vehicle. The air quality improvement device 10 improves the air quality of the air in a room 40 (for example, a vehicle interior 40) and supplies the improved air to the room 40.

[0021] The air quality improvement device 10 includes a flow path 11, adsorption units 12 and 13, a pressurization unit 14, backflow prevention units 15A and 15B, switching units 16 and 17, a purge valve 18, a tank 21, an MFC 22, an oxygen concentration measurement unit 23, a biological sensor 24, a pressure detection unit 25, an inverter 26, a control unit 27, and a notification unit 28.

[0022] The flow path 11 is a flow path that guides the air taken in from the inlet 11A to the outlet 11B. In the flow path 11, the inlet 11A side is also referred to as the upstream side, and the outlet 11B side is also referred to as the downstream side.

[0023] The adsorption units 12 and 13 are each configured as a cylindrical adsorption cylinder. The inner wall of the adsorption cylinder constitutes at least a part of the flow path 11. The adsorption units 12 and 13 are separate from each other. The flow path 11 branches in the middle, and the adsorption unit 12 is provided in one branch flow path 11D, and the adsorption unit 13 is provided in the other branch flow path 11E. That is, the adsorption units 12 and 13 are provided in parallel with each other in the flow path 11.

[0024] The adsorption part 12 includes a first adsorbent 12A that adsorbs nitrogen and a second adsorbent 12B that adsorbs carbon dioxide. The adsorption part 13 includes a first adsorbent 13A that adsorbs nitrogen and a second adsorbent 13B that adsorbs carbon dioxide, respectively. The first adsorbents 12A and 13A are, for example, zeolite-based nitrogen adsorbents. When pressurized, the first adsorbents 12A and 13A preferentially adsorb nitrogen in the air over oxygen, and when depressurized, they release the adsorbed nitrogen to regenerate the adsorbent. The second adsorbents 12B and 13B are, for example, zeolite-based carbon dioxide adsorbents. When pressurized, the second adsorbents 12B and 13B preferentially adsorb carbon dioxide in the air over oxygen, and when depressurized, they release the adsorbed carbon dioxide to regenerate the adsorbent. The first adsorbent 12A and the second adsorbent 12B are integrally formed. The first adsorbent 13A and the second adsorbent 13B are integrally formed.

[0025] The pressurizing part 14 is configured as, for example, a compressor. The pressurizing part 14 is provided upstream of the adsorption parts 12 and 13. The pressurizing part 14 takes in the air supplied from the inlet 11A and supplies and pressurizes the air to the pressurization target flow path 11C where the adsorption parts 12 and 13 are provided. The pressurization target flow path 11C is a flow path in the flow path 11 that is downstream of the pressurizing part 14 and upstream of the backflow prevention parts 15A and 15B.

[0026] The backflow prevention parts 15A and 15B are provided downstream of the adsorption parts 12 and 13. The backflow prevention parts 15A and 15B allow air to flow downstream and prevent air from flowing upstream. The backflow prevention parts 15A and 15B are configured as, for example, orifices.

[0027] The switching unit 16 switches between a first state in which the supply of air from the pressurizing unit 14 to the adsorption unit 12 is allowed to pressurize the adsorption unit 12, and a second state in which the discharge of gas from the adsorption unit 12 to the outside is allowed to depressurize the adsorption unit 12. The switching unit 16 includes on-off valves 16A and 16B. The on-off valve 16A is provided in a branch flow path 11D branched to the adsorption unit 12 side between the pressurizing unit 14 and the adsorption unit 12. The on-off valve 16B is provided between the flow path between the pressurizing unit 14 and the adsorption unit 12 and the exhaust port 31. The switching unit 16 enters the first state when the on-off valve 16A is in the open state and the on-off valve 16B is in the closed state. The switching unit 16 enters the second state when the on-off valve 16A is in the closed state and the on-off valve 16B is in the open state.

[0028] The switching unit 17 switches between a first state in which the supply of air from the pressurizing unit 14 to the adsorption unit 13 is allowed to pressurize the adsorption unit 13, and a second state in which the discharge of gas from the adsorption unit 13 to the outside is allowed to depressurize the adsorption unit 13. The switching unit 17 includes on-off valves 17A and 17B. The on-off valve 17A is provided in a branch flow path 11E branched to the adsorption unit 13 side between the pressurizing unit 14 and the adsorption unit 13. The on-off valve 17B is provided between the flow path between the pressurizing unit 14 and the adsorption unit 13 and the exhaust port 31. The switching unit 17 enters the first state when the on-off valve 17A is in the open state and the on-off valve 17B is in the closed state. The switching unit 17 enters the second state when the on-off valve 17A is in the closed state and the on-off valve 17B is in the open state.

[0029] The purge valve 18 is provided in the bypass flow path 32. The bypass flow path 32 is a flow path connecting the flow path between the adsorption unit 12 and the backflow prevention unit 15A and the flow path between the adsorption unit 13 and the backflow prevention unit ①5B. The purge valve 18 switches between an open state and a closed state.

[0030] The tank 21 is provided on the downstream side of the backflow prevention units 15A and 15B. The tank 21 functions as a storage unit for storing the air after nitrogen and carbon dioxide have been adsorbed by the adsorption units 12 and 13.

[0031] MFC22 is provided downstream of the tank 21. MFC22 is a Mass Flow Controller. MFC22 functions as a flow rate detection unit that detects the flow rate flowing through the flow path 11. Also, MFC22 functions as a flow rate adjustment unit that adjusts the flow rate flowing through the flow path 11.

[0032] The oxygen concentration measurement unit 23 is provided downstream of MFC22. The oxygen concentration measurement unit 23 measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption units 12 and 13. The oxygen concentration measurement unit 23 is configured as, for example, an oxygen sensor. A signal indicating the measurement value by the oxygen concentration measurement unit 23 is input to the control unit 27.

[0033] The biological sensor 24 measures the biological information of the user 41 who uses the air quality improvement device 10. The user 41 is, for example, a driver in the vehicle interior 40. The biological information is, for example, the heart rate and the number of breaths per unit time. The biological sensor 24 may be a contact type that contacts the user 41 or a non-contact type. The biological sensor 24 estimates the carbon dioxide concentration in the vehicle interior 40 based on the biological information of the user 41. The biological sensor 24 stores, for example, correspondence information indicating the correspondence between the biological information and the carbon dioxide concentration in advance. The biological sensor 24 estimates the carbon dioxide concentration in the vehicle interior 40 based on this correspondence information and the measured biological information. The correspondence information is, for example, information associating a higher heart rate or a higher number of breaths with a higher carbon dioxide concentration. The correspondence information may be a table or function information. A signal indicating the carbon dioxide concentration estimated by the biological sensor 24 is input to the control unit 27.

[0034] The pressure detection unit 25 detects the pressure in the pressurization target flow path 11C. The pressure detection unit 25 is configured as, for example, a known pressure sensor. A signal indicating the detection value by the pressure detection unit 25 is input to the control unit 27.

[0035] The control unit 27 is configured to include, for example, a microcomputer. The control unit 27 controls the pressurizing unit 14 via the inverter 26. In the air quality improvement operation, the control unit 27 sets a target pressure based on the biological information measured by the biological sensor 24, and controls the pressurizing unit 14 so that the pressure in the pressure target flow path 11C becomes the target pressure.

[0036] For example, when the start condition is satisfied, the control unit 27 starts the air quality improvement operation shown in FIG. 2. The start condition may be, for example, that the carbon dioxide concentration input from the biological sensor 24 is less than the start threshold value, or may be another condition.

[0037] When the start condition is satisfied, the control unit 27 sets a target pressure based on the biological information measured by the biological sensor 24 in step S11 of FIG. 2. Specifically, the target pressure is set based on the carbon dioxide concentration estimated from the biological information by the biological sensor 24. The control unit 27 stores, for example, pressure information indicating the correspondence between the carbon dioxide concentration and the pressure in advance, and sets the target pressure based on this pressure information and the carbon dioxide concentration. The pressure information is, for example, information associating a higher carbon dioxide concentration with a higher pressure. The pressure information may be a table or function information.

[0038] After setting the target pressure, the control unit 27 sets one of the switching units 16 and 17 to the first state and the other to the second state in step S12. Then, in step S13, the control unit 27 controls the pressurizing unit 14 so that the pressure in the pressure target flow path 11C becomes the target pressure. Thereafter, in step S14, the control unit 27 determines whether or not the switching condition is satisfied. The switching condition may be, for example, that the pressure in the pressure target flow path 11C has reached the target pressure, or that a state where the pressure in the pressure target flow path 11C exceeds the target pressure has elapsed for a predetermined time, or may be another condition.

[0039] When the control unit 27 determines that the switching condition is not satisfied, it returns to step S14. That is, the control unit 27 repeats the process of step S14 until it determines that the switching condition is satisfied. When the control unit 27 determines that the switching condition is satisfied, in step S15, it switches the states of the switching units 16 and 17. That is, the control unit 27 switches the switching unit in the first state to the second state, and switches the switching unit in the second state to the first state. Thereafter, the control unit 27 returns to step S14.

[0040] That is, every time the switching condition is satisfied, the control unit 27 alternately switches the switching units 16 and 17 to the first state. As a result, when the switching unit 16 is in the first state, the air quality improvement device 10 adsorbs nitrogen and carbon dioxide in the air taken in from the inlet 11A by the adsorption unit 12, and discharges the air after nitrogen and carbon dioxide are adsorbed by the adsorption unit 12 from the outlet 11B. Further, when the switching unit 17 is in the first state, the air quality improvement device 10 adsorbs nitrogen and carbon dioxide in the air taken in from the inlet 11A by the adsorption unit 13, and discharges the air after nitrogen and carbon dioxide are adsorbed by the adsorption unit 13 from the outlet 11B. Thereby, the air quality improvement device 10 can efficiently generate air with reduced nitrogen and carbon dioxide and increased oxygen concentration, and supply it to the user 41, and thus can improve the state of the user 41. Furthermore, the air quality improvement device 10 can adjust the adsorption amounts of nitrogen and carbon dioxide by the adsorption units 12 and 13 by controlling the pressurization unit 14 so that the pressure in the pressurization target flow path 11C becomes the pressure corresponding to the biological information of the user 41. That is, the air quality improvement device 10 can adjust the oxygen concentration and carbon dioxide concentration of the air discharged from the outlet 11B according to the biological information of the user 41.

[0041] Further, the control unit 27 determines whether or not the biological information measured by the biological sensor 24 is normal at a predetermined timing after the air quality improvement operation is started. When it is determined that the biological information is not normal, it is determined that the adsorption units 12 and 13 are deteriorated. According to this configuration, the air quality improvement apparatus 10 can determine that the adsorption units 12 and 13 are deteriorated when the biological information does not become normal even after a certain period of time has elapsed since the start of the air quality improvement operation.

[0042] The predetermined timing may be, for example, the timing when a predetermined time has elapsed since the start of the air quality improvement operation, or may be another timing. The control unit 27 determines that the biological information is normal when the carbon dioxide concentration input from the biological sensor 24 is equal to or higher than a predetermined normal threshold value, and determines that the biological information is not normal when it is less than the normal threshold value.

[0043] Further, the control unit 27 determines that the second adsorbents 12B and 13B are deteriorated when it is determined that the biological information is not normal at the above-mentioned predetermined timing and it is determined that the oxygen concentration measured by the oxygen concentration measurement unit 23 is equal to or higher than the reference value. According to this configuration, the air quality improvement apparatus 10 can determine that the second adsorbents 12B and 13B are deteriorated when the biological information does not become normal even though the oxygen concentration is equal to or higher than the reference value at a certain point in time after the start of the air quality improvement operation.

[0044] Further, the control unit 27 determines that at least the first adsorbents 12A and 13A among the first adsorbents 12A and 13A and the second adsorbents 12B and 13B are deteriorated when it is determined that the biological information is not normal at the above-mentioned predetermined timing and it is determined that the oxygen concentration measured by the oxygen concentration measurement unit 23 is less than the reference value. According to this configuration, the air quality improvement apparatus 10 can determine that at least the first adsorbents 12A and 13A are deteriorated when the biological information does not become normal and the oxygen concentration is less than the reference value at a certain point in time after the start of the air quality improvement operation.

[0045] When the control unit 27 determines that at least a part of the suction units 12 and 13 has deteriorated, it causes the notification unit 28 to perform a notification operation to notify the user 41 to that effect. The notification unit 28 is, for example, an audio output device or a display. The audio output device is, for example, a speaker or a buzzer. The display is, for example, a liquid crystal display or a lamp. In the configuration where the air quality improvement device 10 is mounted on a vehicle, the notification unit 28 may be one that is pre-mounted on the vehicle or one that is retrofitted.

[0046] Further, when the control unit 27 determines at the above-mentioned predetermined timing that the biological information is normal and that the oxygen concentration measured by the oxygen concentration measurement unit 23 is equal to or higher than the reference value, it stops the air quality improvement operation. According to this configuration, when a certain amount of time has elapsed since the start of the air quality improvement operation, if the biological information is normal and the oxygen concentration is equal to or higher than the reference value, the air quality improvement device 10 can stop the air quality improvement operation to save power.

[0047] Further, when the control unit 27 determines that the biological information has changed suddenly, it controls the MFC 22 to increase the flow rate and discharges the air stored in the tank 21 from the outlet 11B. According to this configuration, when the state of the user 41 changes suddenly, the air quality improvement device 10 can discharge more concentrated oxygen. The control unit 27 may determine that the biological information has changed suddenly, for example, when it determines that the carbon dioxide concentration has decreased suddenly. The control unit 27 may determine that the carbon dioxide concentration has decreased suddenly, for example, when it determines that the carbon dioxide concentration has decreased by a certain value or more within a certain period of time.

[0048] <Other Embodiments> The present invention is not limited to the embodiments described with the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention. Also, various features of the above-described embodiments and the embodiments described below may be combined in any combination as long as they do not conflict.

[0049] (1) In the above-described first embodiment, the first adsorbent and the second adsorbent were integrally formed, but the first adsorbent and the second adsorbent may be separate from each other.

[0050] (2) In the above-described first embodiment, the number of adsorption units was two, but it may be one or three or more. When the number of adsorption units is three or more, the adsorption units may be provided in parallel with each other in the flow path, and a switching unit may be provided corresponding to each adsorption unit. Then, the state of each switching unit may be switched so that at least a part of the switching units is in the first state.

[0051] (3) In the above-described first embodiment, the target pressure was set only once at the start of the air quality improvement operation, but the biological information may be periodically acquired during the execution of the air quality improvement operation to periodically update the target pressure.

[0052] (4) In the above-described first embodiment, the target pressure was set based on the carbon dioxide concentration estimated from the biological information of the user, but the target pressure may be set directly from the biological information of the user.

[0053] It should be considered that all the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, and it is intended that all modifications within the scope shown by the claims or within the scope equivalent to the claims are included.

Explanation of Reference Numerals

[0054] 10…Air quality improvement device 11…Flow path 11A…Inlet 11B…Outlet 11C…Flow path to be pressurized 11D…Branch flow path 11E…Branch flow path 12…Adsorption unit 12A…First adsorbent 12B…Second adsorbent 13…Adsorption unit 13A…First adsorbent 13B…Second adsorbent 14…Pressurizing section 15A…Backflow prevention section 15B…Backflow prevention section 16…Switching section 16A…On-off valve 16B…On-off valve 17…Switching section 17A…On-off valve 17B…On-off valve 18…Purge valve 21…Tank 23…Oxygen concentration measurement section 24…Biological sensor 25…Pressure detection section 26…Inverter 27…Control section 31…Exhaust port 32…Bypass flow path 40…Indoor 41…User

Claims

1. An adsorption unit that adsorbs an adsorption target that is at least one of nitrogen and carbon dioxide; A pressurization unit that supplies and pressurizes air to a pressurization target flow path in which the adsorption unit is provided; A control unit that controls the pressurization unit, and includes: An air quality improvement device that performs an air quality improvement operation of adsorbing the adsorption target of the air taken in from an inlet by the adsorption unit and discharging the air after the adsorption target is adsorbed by the adsorption unit from an outlet, Further provided with a biological sensor that measures biological information of a user who uses the air quality improvement device, In the air quality improvement operation, the control unit sets a target pressure based on the biological information measured by the biological sensor, and controls the pressurization unit so that the pressure in the pressurization target flow path becomes the target pressure Air quality improvement device.

2. The control unit determines whether the biological information measured by the biological sensor is normal at a predetermined timing after the air quality improvement operation is started, and when it is determined that the biological information is not normal, determines that the adsorption unit is deteriorated The air quality improvement device according to claim 1.

3. An oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit, The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide, When the control unit determines at the predetermined timing that the biological information is not normal and determines that the oxygen concentration measured by the oxygen concentration measurement unit is equal to or higher than a reference value, it determines that the second adsorbent is deteriorated The air quality improvement device according to claim 2.

4. An oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit, The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide, When the control unit determines at the predetermined timing that the biological information is not normal and determines that the oxygen concentration measured by the oxygen concentration measurement unit is less than a reference value, it determines that at least the first adsorbent among the first adsorbent and the second adsorbent is deteriorated The air quality improvement device according to claim 2.

5. An oxygen concentration measurement unit that measures the oxygen concentration of the air after the adsorption target is adsorbed by the adsorption unit, The adsorption unit includes a first adsorbent that adsorbs nitrogen and a second adsorbent that adsorbs carbon dioxide, When the control unit determines that the biological information is normal at the predetermined timing and determines that the oxygen concentration measured by the oxygen concentration measurement unit is equal to or higher than a reference value, the control unit stops the air quality improvement operation. The air quality improvement device according to claim 2.

Images