Carbon dioxide absorption device, and air cleaner

Abstract

The present invention provides a carbon dioxide absorption device and an air cleaner in which a reaction efficiency of a carbon dioxide can be improved. A carbon dioxide absorption device 100 has an absorption unit 20 and a housing 10. The absorption unit 20 houses a fan 50, an air cleaning filter 30 through which air flows when the fan 50 is driven, and an absorption filter 21 which absorbs carbon dioxide, and air flows through the absorption unit 20 when the fan 50 is driven. In the carbon dioxide absorption device 100, a first wind speed, which is the wind speed of the air passing through the absorption unit 20, is set to a value of 0.02 m / s or more and less than 0.50 m / s.

Description

Carbon dioxide absorbers and air purifiers

[0001] The present invention relates to a carbon dioxide absorption device and an air purifier.

[0002] In recent years, environmental protection activities have become increasingly common in society. In particular, efforts to capture carbon dioxide, which is believed to be a cause of global warming, are being undertaken by companies and public organizations.

[0003] For example, Patent Document 1 discloses an air purifier equipped with a carbon dioxide fixation filter, a main filter, and a fan. When the fan is driven, air entering through an air intake passes through the carbon dioxide fixation filter, the main filter, and is discharged through an air exhaust port. The carbon dioxide fixation filter adsorbs and fixes carbon dioxide from the air passing through it. The main filter adsorbs suspended dust particles from the air passing through it.

[0004] Japanese Patent Application Publication No. 7-68164

[0005] In an air purifier capable of adsorbing carbon dioxide and a carbon dioxide absorption device such as those described in Patent Document 1, it is desired to improve the reaction efficiency (absorption efficiency) of carbon dioxide.

[0006] This disclosure has been made to solve the above-mentioned problems, and aims to provide a carbon dioxide absorption device and an air purifier that can improve the reaction efficiency of carbon dioxide.

[0007] In order to achieve the above object, the carbon dioxide absorption device according to the first aspect of the present disclosure, which is disclosed below, comprises an absorption filter containing a hydroxide that absorbs carbon dioxide, and a housing in which the absorption filter is arranged, and the housing has a first wind speed, which is the wind speed of air passing through the absorption filter, of 0.02 m / s or more and less than 0.50 m / s.

[0008] An air purifier according to a second aspect of the present disclosure comprises a fan, an air purification section that ventilates air when driven by the fan, an absorption unit that houses an absorption filter that absorbs carbon dioxide, and a housing in which the fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when driven by the fan, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when driven by the fan, is higher than the first wind speed.

[0009] An air purifier according to a third aspect of the present disclosure comprises a first fan, a second fan, an air purification section through which air is ventilated when the first fan is driven, an absorption unit containing an absorption filter that absorbs carbon dioxide, and through which air is ventilated when the second fan is driven, and a housing in which the first fan, the second fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the second fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the first fan is driven, is higher than the first wind speed.

[0010] A carbon dioxide absorption device according to a fourth aspect of the present disclosure comprises an absorption unit that houses an absorption filter containing a hydroxide that absorbs carbon dioxide, the absorption unit through which air passes, and a housing in which the absorption unit is arranged, the housing being configured so that a first wind speed, which is the wind speed of air passing through the absorption unit, is a value of 0.02 m / s or more and less than 0.50 m / s, and the housing includes an air passage through which air passes at a second wind speed that is a wind speed higher than the first wind speed.

[0011] According to the above configuration, the reaction efficiency of carbon dioxide can be improved.

[0012] FIG. 1 is a cross-sectional view showing the configuration of an air purifier 100 according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of an absorption filter 21. FIG. 3 is a diagram illustrating an air passage from an intake port 11 to an exhaust port 12 according to the first embodiment. FIG. 4 is a diagram illustrating an example of rotation of a damper 60. FIG. 5 is a block diagram of the air purifier 100 according to the first embodiment. FIG. 6 is a block diagram illustrating the configuration of an air purifier 200 according to a second embodiment. FIG. 7 is a diagram illustrating the configuration of a damper 260 according to the second embodiment. FIG. 8 is a diagram illustrating the configuration of an air purifier 300 according to a third embodiment. FIG. 9 is a cross-sectional view illustrating the configuration of an air purifier 300 according to the third embodiment. FIG. 10 is a diagram illustrating the configuration of an air purifier 500 according to a fourth embodiment. FIG. 11 is a diagram illustrating the relationship between the speed of air passing through an absorbing member and reaction efficiency. FIG. 12A is a diagram summarizing measurement results. FIG. 12B is a diagram illustrating the saturated reaction rate. FIG. 13 is a diagram illustrating the configuration of an air purifier 400 according to a first modified example of the first to fourth embodiments. FIG. 14 is a diagram illustrating the configuration of a carbon dioxide absorbing device 600 according to a second modified example of the first to fourth embodiments. FIG. 15 is a diagram illustrating the configuration of a carbon dioxide absorbing device 700 according to a third modified example of the first to fourth embodiments. FIG. 16 is a piping diagram illustrating the configuration of an air conditioning system 800 according to a fifth embodiment. FIG. 17 is a cross-sectional view of a portion of the air conditioning system 800 according to the fifth embodiment. FIG. 18 is a cross-sectional view of a portion of the air conditioning system 800 according to the fifth embodiment. FIG. 19 is a cross-sectional view of a portion of an air conditioning system 900 according to a first modified example of the fifth embodiment. FIG. 20 is a cross-sectional view of a portion of the air conditioning system 900 according to the first modified example of the fifth embodiment. FIG. 21 is a cross-sectional view of a portion of an air conditioning system 1000 according to a second modified example of the fifth embodiment. FIG. 22 is a cross-sectional view of a portion of the air conditioning system 1000 according to a second modified example of the fifth embodiment. FIG. 23 is a diagram illustrating the configuration of a vehicle 1100 according to a sixth embodiment. Fig. 24 is a diagram showing the configuration of an aircraft 1200 according to the seventh embodiment. Fig. 25 is a cross-sectional view showing the configuration of an air-conditioning system 1300 according to a third modified example of the fifth embodiment. Fig. 26 is a cross-sectional view showing the configuration of an air-conditioning system 1300 according to the third modified example of the fifth embodiment.

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the following embodiments, and appropriate design modifications can be made within the scope of the configuration of the present disclosure. In the following description, the same reference numerals are used in common between different drawings for identical parts or parts having similar functions, and repeated description thereof will be omitted. In addition, the respective configurations described in the embodiments and modified examples may be combined or modified as appropriate. In addition, to make the description easier to understand, the drawings referred to below show simplified or schematic configurations, and some components are omitted.

[0014] First Embodiment (Overall Configuration of Air Purifier 100) FIG. 1 is a cross-sectional view showing the configuration of an air purifier 100 according to a first embodiment.

[0015] The air purifier 100 according to the first embodiment is a device that removes dust particles from the air (purifies the air) and removes (absorbs and captures) carbon dioxide from the air. The air purifier 100 may be installed indoors or outdoors as a standalone device, or may be incorporated into other devices (such as vehicles, aircraft, ships, air conditioning equipment, and vending machines). When the air purifier 100 is installed outdoors, it is preferable that the housing 10 of the air purifier 100 be waterproof; however, when the location is not subject to rain or snow, the housing 10 does not need to be waterproof.

[0016] (Configuration of Each Part of Air Purifier 100) As shown in FIG. 1 , the air purifier 100 includes a housing 10. The housing 10 is provided with an air intake 11, an exhaust 12, an opening 13, a maintenance door 14, and wheels 15. In the first embodiment, the air intake 11 is formed on the bottom surface of the housing 10. The air intake 11 introduces air from outside the housing 10 into the housing 10. The exhaust 12 is formed on the top surface of the housing 10. The exhaust 12 exhausts air from inside the housing 10 to the outside of the housing 10. The opening 13 is formed on the side surface of the housing 10. In the first embodiment, the opening 13 introduces air from outside the housing 10 into an air passage 80 inside the housing 10. The maintenance door 14 is configured to be opened and closed by rotating on a hinge (not shown). In the following description, the horizontal plane is defined as the XY plane, and the directions within the XY plane are defined as the X1 direction, X2 direction, Y1 direction, and Y2 direction, as shown in Fig. 1. The upward direction is defined as the Z1 direction, and the downward direction is defined as the Z2 direction.

[0017] As shown in FIG. 1 , the air purifier 100 also includes an absorption unit 20 , an air purification filter 30 , nonwoven fabric filters 41 and 42 , a fan 50 , and a damper 60 .

[0018] The absorption unit 20 is provided with one or more absorption filters 21. While FIG. 1 illustrates three absorption filters 21, two or fewer or four or more absorption filters 21 may be provided in the absorption unit 20. For example, the absorption filters 21 are arranged vertically side by side. The absorption filters 21 have the same shape. This reduces the manufacturing cost of the absorption filters 21. The absorption filters 21 are configured to be individually removable from the housing 10 when the maintenance door 14 is open in the X2 direction. For example, the absorption filters 21 are arranged within the housing 10 so that they can slide toward the maintenance door 14 (in the X2 direction). This allows only the absorption filters 21 to be replaced among the plurality of absorption filters 21, and the number of absorption filters 21 arranged in the absorption unit 20 can be changed depending on the situation. As a result, the absorption filters 21 can be easily replaced, which facilitates recycling of the absorption members 21a.

[0019] In the first embodiment, the absorption unit 20 is disposed in the lower portion of the housing 10. The absorption unit 20 is also disposed upstream of the airflow generated by the fan 50 relative to the air cleaning filter 30.

[0020] FIG. 2 is a cross-sectional view schematically illustrating the configuration of the absorption filter 21. As shown in FIG. 2, the absorption filter 21 is a filter that absorbs carbon dioxide. The absorption filter 21 includes an absorption member 21a that absorbs carbon dioxide and a case 21b that houses the absorption member 21a. The absorption member 21a is, for example, a hydroxide-based carbon dioxide absorbent. The absorption member 21a includes a hydroxide that absorbs carbon dioxide through a chemical reaction. That is, the absorption member 21a is a member that chemically reacts with carbon dioxide in the air upon contact with the air to remove carbon dioxide from the air. The member that absorbs carbon dioxide through a chemical reaction includes a calcium-based material. An example of the calcium-based material is calcium hydroxide. Note that, in addition to methods that use chemical reactions, carbon dioxide absorption methods include methods that physically adsorb carbon dioxide molecules into the pores of the absorption member without causing a chemical reaction. For example, there is a method in which carbon dioxide molecules are adsorbed onto a porous material such as zeolite. This method of physically adsorbing carbon dioxide molecules onto an absorbent member requires a step of desorbing carbon dioxide from the absorbent member and converting the desorbed carbon dioxide into a solid, increasing the number of steps required to convert the carbon dioxide into a solid. In contrast, the configuration of the first embodiment uses a member that absorbs carbon dioxide through a chemical reaction, allowing carbon dioxide to be recovered in a solid (powder) state after chemical transformation. This makes it easier to reuse carbon dioxide than a method of physically adsorbing carbon dioxide molecules onto an absorbent member. The absorbent member 21a may contain hydroxides other than calcium hydroxide. For example, sodium hydroxide, magnesium hydroxide, ammonium hydroxide, or potassium hydroxide may be contained in the absorbent member 21a. The absorbent member 21a has a cylindrical shape, an average diameter Φ of 2 mm to 3 mm, and a length (height) of 5.0 mm.

[0021] Furthermore, when calcium hydroxide is used for the absorbent member 21a, calcium carbonate can be produced by absorbing carbon dioxide into the calcium hydroxide. The produced calcium carbonate can be used to produce raw materials for various recycled products.

[0022] The absorbing member 21a may also contain a dye such as methyl violet. In this case, the absorbing member 21a is configured to change color in response to a change in pH caused by the amount of carbon dioxide absorbed. In this case, for example, the absorbing member 21a changes from "white" to "red, purple, or pink" upon absorbing carbon dioxide. The absorbing member 21a may also be one that changes from "red or purple" to "white or pink" upon absorbing carbon dioxide, or one that changes to a color other than those described above.

[0023] The absorbing member 21a is formed in a granular shape. As shown in Fig. 3, a plurality of absorbing members 21a are arranged in the case portion 21b. Forming the absorbing member 21a from a solid makes it easier to handle than a liquid, and the absorbing member 21a is less likely to adhere to the user when replacing the absorption filter 21. The case portion 21b has ventilation holes (not shown) or is formed in a breathable mesh shape. This allows the absorbing member 21a in the case portion 21b to come into contact with outside air.

[0024] 2, a two-dimensional code 21c is attached to the absorption filter 21. The two-dimensional code 21c is, for example, a QR code (registered trademark). Note that the absorption unit 20 may be provided with a one-dimensional code (barcode) instead of the two-dimensional code 21c, or may be provided with an electrical circuit capable of storing information, such as an IC chip. The two-dimensional code 21c can be used, for example, as the "two-dimensional code" described in Japanese Patent No. 7189644.

[0025] The air purifying filter 30 is, for example, a filter that captures dust. A HEPA filter can be used as the air purifying filter 30. As shown in FIG. 1 , the air purifying filter 30 is disposed between the absorption unit 20 and the fan 50. The air purifying filter 30 is disposed downstream of the airflow generated by the fan 50 relative to the absorption unit 20 (the upper part of the housing 10). As a result, even if part of the absorbing member 21a is released from the absorption unit 20, the absorbing member 21a is captured by the air purifying filter 30, and the absorbing member 21a can be prevented from being released outside the air purifier 100.

[0026] The nonwoven fabric filters 41 and 42 have higher breathability than the air purifying filter 30 and prevent foreign matter and dust from entering the housing 10. The nonwoven fabric filter 41 is arranged upstream of the absorption unit 20 in the airflow. The nonwoven fabric filter 42 is arranged on the intake side of the air purifying filter 30.

[0027] The fan 50 is driven by the supply of power, and as shown in FIG. 3 , it draws air into the housing 10 through the intake port 11 and the opening 13 and exhausts the air outside the housing 10 through the exhaust port 12. The fan 50 may be, for example, a sirocco fan, but may also be a propeller fan, turbo fan, or the like. Furthermore, in the first embodiment, a fan 50 is employed such that, when the power consumption of the fan 50 is converted into carbon dioxide, the converted amount of carbon dioxide is less than the amount of carbon dioxide that can be absorbed by the absorption unit 20. Note that the inside of the damper 60 (ventilation path 80) is under negative pressure because the fan 50 is located downstream. Therefore, air is not released outside the housing 10 without passing through the air purification filter 30.

[0028] 3 is a diagram illustrating the airflow path from the air intake 11 to the air exhaust 12 according to the first embodiment. As shown in FIG. 3 , the air intake 11, the nonwoven fabric filter 41, the absorption unit 20, the damper 60 and the opening 13, the nonwoven fabric filter 42, the air purification filter 30, the fan 50, and the air exhaust 12 are arranged in this order from the upstream side of the airflow in the housing 10. The "airflow" refers to the flow of air generated by driving the fan 50. Note that driving one fan 50 generates an airflow A1 that flows through the air intake 11, the nonwoven fabric filter 41, the absorption unit 20, the damper 60 and the opening 13, the nonwoven fabric filter 42, the air purification filter 30, the fan 50, and the air exhaust 12 in this order, and an airflow A2 that flows through the opening 13 (damper 60), the nonwoven fabric filter 42, the air purification filter 30, the fan 50, and the air exhaust 12 in this order. As described above, in the first embodiment, both the airflow A1 and the airflow A2 pass through the air purification filter 30, and only the airflow A1 passes through the absorption unit 20. This allows the volume of air passing through the air purification filter 30 to be greater than the volume of air passing through the absorption unit 20. As a result, it is possible to improve the air purification function of the air purifier 100. Furthermore, in the air purifier 100 of the first embodiment, the fan 50 for ventilating the air purification filter 30 and the fan 50 for ventilating the absorption unit 20 can be a common fan.

[0029] As shown in FIG. 1, the housing 10 has an air intake 11, a nonwoven fabric filter 41, an absorption unit 20, a damper 60 and an opening 13, a nonwoven fabric filter 42, an air purification filter 30, a fan 50, and an exhaust vent 12 arranged in this order from top to bottom.

[0030] The opening 13 introduces air from outside the housing 10 into the ventilation path 80 between the absorption unit 20 and the air purification filter 30. When the fan 50 is driven, the ventilation path 80 becomes negative pressure relative to the outside of the housing 310, causing air from outside the housing 10 to enter the ventilation path 80 through the opening 13. FIG. 4 is a diagram illustrating an example of the rotation of the damper 60. The damper 60 is configured to change the opening degree of the opening 13 by changing the position (angle) of the flap. The "opening degree" is larger the smaller the pressure loss of air passing through the opening 13, and smaller the larger the pressure loss of air passing through the opening 13. Reducing the "opening degree" means, for example, blocking part of the opening 13 with the damper 60 or moving the damper 60 to a position (angle) that obstructs the flow of air. For example, in the example of FIG. 4, the damper 60 moves from position P2 to position P1. Increasing the "opening degree" means, for example, opening the opening 13 with the damper 60 or moving the damper 60 to a position (angle) that does not obstruct the flow of air. For example, in the example of Fig. 4, the damper 60 moves from position P2 to position P3. Note that although Fig. 1 illustrates six dampers 60, the number of dampers 60 may be five or less or seven or more.

[0031] FIG. 5 is a block diagram of an air purifier 100 according to a first embodiment. The air purifier 100 includes a control circuit 70, a storage unit 71, and a sheet number sensor 72. The storage unit 71 includes a nonvolatile storage circuit (memory). The storage unit 71 stores information correlating the number of absorption filters 21 arranged in the absorption unit 20 with the position of the damper 60. For example, the position of the damper 60 is set so that a first wind speed, which is the wind speed of air passing through the absorption unit 20, is 0.02 m / s or more and 0.15 m / s or less, and a second wind speed, which is the wind speed of air passing through the air purification filter 30, is 0.3 m / s or more and 0.5 m / s or less. Note that the first wind speed may be a value of 0.02 m / s or more and less than 0.50 m / s. In this case, the second wind speed is set to be higher than the first wind speed. The first wind speed may be equal to or greater than 0.02 m / s and less than 0.25 m / s, but in this case the second wind speed is set to be higher than the first wind speed.

[0032] The number sensor 72 is disposed in the absorption unit 20. The number sensor 72 detects the number of absorption filters 21 in the absorption unit 20. For example, the number sensor 72 is a contact sensor. However, the number sensor 72 may also be a non-contact sensor (optical or magnetic sensor). The number sensor 72 transmits information on the detected number to the control circuit 70. In the example of FIG. 4 , the control circuit 70 obtains the number of absorption filters 21 from the number sensor 72. Then, when the number of absorption filters 21 is "three," the control circuit 70 controls the drive of the damper 60 so that the damper 60 is positioned at position P1. Note that, in the first embodiment, the damper 60 is provided with a drive device such as a motor. Furthermore, when the number of absorption filters 21 is "two," the control circuit 70 controls the drive of the damper 60 so that the damper 60 is positioned at position P2. When the number of absorption filters 21 is "one", the control circuit 70 controls the driving of the damper 60 so that the damper 60 is disposed at position P3.

[0033] Information associating the above positions P1 to P3 with the number of absorption filters 21 is prepared in advance at the design stage of the air purifier 100. For example, with the maximum number of absorption filters 21 arranged in the absorption unit 20 and with the air purification filters 30 attached to the housing 10, the fan 50 is operated. The position of the damper 60 is recorded so that the air speed passing through the absorption filters 21 is the air volume at which the absorption efficiency of the absorption filters 21 is maximized. This position is associated with the maximum number. Then, one absorption filter 21 is removed from the absorption unit 20, and the position of the damper 60 is recorded so that the air speed passing through the absorption filter 21 is the air volume at which the absorption efficiency of the absorption filter 21 is maximized. By repeating this process, information associating the positions P1 to P3 with the number of absorption filters 21 is created.

[0034] The damper 60 can adjust the amount of air passing through the opening 13 (the difference between the amount of air passing through the air purification filter 30 and the amount of air passing through the absorption unit 20). As a result, even if the number of absorption filters 21 in the absorption unit 20 is changed, air is supplied at an appropriate wind speed, which can improve the reaction efficiency of carbon dioxide.

[0035] Second Embodiment Next, the configuration of an air purifier 200 according to a second embodiment will be described with reference to Figures 6 and 7. In the second embodiment, the damper 260 of the air purifier 200 is configured so that its position can be changed manually. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and their description will be omitted.

[0036] Fig. 6 is a block diagram showing the configuration of an air purifier 200 according to the second embodiment. Fig. 7 is a diagram for explaining the configuration of a damper 260 according to the second embodiment. As shown in Fig. 6, the air purifier 200 includes a control circuit 270. The control circuit 270 turns the operation of the fan 50 on and off and increases or decreases the airflow rate of the fan 50 in response to input operations on an operation panel (not shown), but does not control the damper 260.

[0037] As shown in Fig. 7, a damper 260 is disposed in the housing 210 of the air purifier 200. The position of the damper 260 is not changed by wind passing through the opening 13 (see Fig. 1), but is configured to be manually adjustable. "Manually" means that the position is changed while being held by a person (user)'s hand. The damper 260 moves, for example, between positions P1, P2, and P3 shown in Fig. 7.

[0038] Furthermore, in the second embodiment, the housing 210 is provided with a mark 261 that corresponds the number of absorption filters 21 arranged in the absorption unit 20 with the position of the damper 260. The mark 261 is, for example, a line on the housing 210 at a position on an extension line of the flap (blade) of the damper 60, and letters or marks indicating the number of absorption filters 21 (for example, "1," "2," or "3") are written. This allows the damper 260 to be moved in accordance with the mark 261, so that even when the position of the damper 260 is switched manually, the position of the damper 260 can be adjusted so that the wind speed passing through the absorption filters 21 becomes an appropriate value. Other configurations and effects are similar to those of the first embodiment.

[0039] [Third embodiment] Next, the configuration of an air purifier 300 according to a third embodiment will be described with reference to Figures 8 and 9. In the third embodiment, an air purification filter 330 is disposed upstream of the absorption unit 320 in the airflow direction. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0040] FIG. 8 is a diagram illustrating the configuration of an air purifier 300 according to a third embodiment. As shown in FIG. 8, the air purifier 300 includes a fan 350, an air purification filter 330, a damper 360, an opening 313, and an absorption unit 320. In addition, in the housing 310, the following are arranged in this order from the upstream side of the airflow A11 generated by driving the fan 350: an air intake 11, a nonwoven fabric filter 41, the fan 350, the air purification filter 330, the damper 360 (opening 313), the nonwoven fabric filter 42, the absorption unit 320, and the exhaust port 12. As shown in FIG. 9, the following are arranged from the bottom of the housing 310: the nonwoven fabric filter 41, the fan 350, the air purification filter 330, the damper 360 (opening 313), the nonwoven fabric filter 42, the absorption unit 320, and the exhaust port 12. In the third embodiment, the opening 313 opens upward. The absorption filter 21 of the absorption unit 320 is placed on a breathable mesh 315 .

[0041] Furthermore, in the third embodiment, the opening 313 is disposed downstream of the fan 350. As a result, the opening 313 discharges air from the ventilation path 380 between the air purification filter 330 and the absorption unit 320 to the outside of the housing 310 via the damper 360. The presence of the absorption unit 320 downstream of the ventilation path 380 creates a positive pressure in the ventilation path 380 relative to the outside of the housing 310, causing air to flow out of the housing 310 through the opening 313. As a result, when the fan 350 is driven, an airflow A12 is generated that flows in the following order: the air intake 11, the nonwoven fabric filter 41, the air purification filter 330, the fan 350, the damper 360 (opening 313), and the outside of the housing 310. As a result, both the airflow A11 and the airflow A12 pass through the air purification filter 330, and only the airflow A11 passes through the absorption unit 320. As shown in FIG. 9, the size of the damper 360 is larger than the size of the damper 60 of the first embodiment, and the size of the opening 313 is larger than the size of the opening 13 of the first embodiment.

[0042] According to the air purifier 300 of the third embodiment, even when the air purifier 300 is installed in a dusty industrial facility such as a welding farm, the air from which dust and other particles have been removed by the air purification filter 330 passes through the absorption unit 320. This prevents the absorption unit 320 from becoming clogged with dust and other particles. The other configurations and effects are the same as those of the first embodiment.

[0043] [Fourth embodiment] Next, the configuration of an air purifier 500 according to a fourth embodiment will be described with reference to Fig. 10. The fourth embodiment includes a first fan 551 that passes air through an air purification filter 530, and a second fan 552 that passes air through an absorption unit 520. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0044] 10 , the air purifier 500 includes a housing 510, a first fan 551, a second fan 552, an air purification filter 530, an absorption unit 520, and nonwoven fabric filters 541 and 542. The housing 510 is provided with an air purification intake port 511a, an absorption unit intake port 511b, an air purification exhaust port 514a, and an absorption unit exhaust port 514b. In the upper part of the housing 510, the air purification intake port 511a, the nonwoven fabric filter 542, the air purification filter 530, the first fan 551, and the air purification exhaust port 514a are arranged in this order from the upstream side of the airflow A32 generated by driving the first fan 551. In addition, in the lower part of the housing 510, from the upstream side of the airflow A31 generated by driving the second fan 552, an intake port 511b for the absorption unit, a nonwoven fabric filter 541, an absorption unit 520, the second fan 552, and an exhaust port 514b for the absorption unit are arranged in this order.

[0045] The airflow rate of the second fan 552 and the housing 510 are configured so that when the second fan 552 is driven, a first wind speed, which is the wind speed of air passing through the absorption unit 520, is 0.02 m / s or more and 0.15 m / s or less. The airflow rate of the first fan 551 and the housing 510 are configured so that when the first fan 551 is driven, a second wind speed, which is the wind speed of air passing through the air purification filter 530, is 0.3 m / s or more and 0.5 m / s or less. The first wind speed may be 0.02 m / s or more and less than 0.50 m / s, but in this case, the second wind speed is set higher than the first wind speed. The first wind speed may be 0.02 m / s or more and less than 0.25 m / s, but in this case, the second wind speed is set higher than the first wind speed. Other configurations and effects are similar to those of the first embodiment.

[0046] 16 to 18, the configuration of an air conditioning system 800 according to a fifth embodiment will be described. In the fifth embodiment, an absorption unit 820 of the air conditioning system 800 is disposed inside a duct 810. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0047] FIG. 16 is a piping diagram showing the configuration of an air conditioning system 800 according to the fifth embodiment. FIGS. 17 and 18 are cross-sectional views of a portion of the air conditioning system 800 according to the fifth embodiment. As shown in FIG. 16, the air conditioning system 800 is an air conditioning system for a building or other structure. The air conditioning system 800 supplies air to each room from air intakes E11-13 and E21-E23 on each floor (first and second floors in FIG. 16) and exhausts the air from exhausts G11-G13 and G21-G23 on each room. The air conditioning system 800 includes a duct 810, a blower 831, an air purifier 832 (filter), a valve 833, and valves 834a-834c.

[0048] Duct 810 connects air intake ports E11-13 and E21-E23, exhaust ports G11-G13 and G21-23, blower 831, and air purifier 832, and allows air to pass through. Blower 831 generates an airflow within duct 810. Air purifier 832 collects dust and other particles from the air passing through. Valve 833 is a valve for adjusting the amount of fresh air introduced from outside air conditioning system 800. Valves 834a-834c are valves for adjusting the amount of air passing through air purifier 832 and the amount of air circulating within duct 810.

[0049] Fig. 17 is a cross-sectional view (longitudinal cross-sectional view) taken in the direction in which duct 810 extends, and Fig. 18 is a cross-sectional view (transverse cross-sectional view) taken in a direction across duct 810. Air conditioning system 800 includes a plurality of absorption units 820. The plurality of absorption units 820 are arranged inside duct 810. Fig. 16 shows an example in which absorption units 820 are arranged near exhaust outlets G11 to G13 and G21 to G23, but they may also be arranged near intake outlets E11 to E13 and E21 to E23, or inside duct 810 at other locations.

[0050] As shown in FIG. 17 , the plurality of absorption units 820 includes a pair of absorption units 820 arranged in a V-shape in plan view. The pair of absorption units 820 are arranged so that the distance between them gradually increases from the upstream side to the downstream side of the airflow A61. The pair of absorption units 820 are rotatably fixed to the duct 810 by shafts 812 (e.g., hinges, etc.). The shafts 812 are arranged to extend vertically. This makes the distance D1 between the pair of absorption units 820 variable. The distance D1 is the width of the air passage 813. In other words, increasing the distance D1 increases the wind speed of the airflow A61 in the air passage 813, whereas decreasing the distance D1 decreases the wind speed of the airflow A61 in the air passage 813. Here, the wind speed of the airflow A61 is higher than the wind speed of the airflow A62 passing through the absorption unit 820 (a value of 0.02 m / s or more and less than 0.50 m / s).

[0051] 18 , an air vent 811 is provided on the upper surface of the duct 810. The upper surface of the duct 810 corresponds to, for example, the floor surface of a room. As a result, air introduced through the air vent 811 passes through the absorption unit 820 and moves inside the duct 810.

[0052] According to the configuration of the fifth embodiment, even when the absorption unit 820 is disposed inside the duct 810, it is possible to improve the reaction efficiency of carbon dioxide while ensuring the wind speed through the ventilation path 813. Furthermore, since the width (D1) of the ventilation path 813 can be changed, it is possible to adjust the wind speed inside the ventilation path 813. Note that the other configurations and effects are the same as those of the first embodiment.

[0053] [First Modification of Fifth Embodiment] Next, the configuration of an air conditioning system 900 according to a first modification of the fifth embodiment will be described with reference to Figures 19 and 20. In the first modification of the fifth embodiment, unlike the shaft 812 of the fifth embodiment which was arranged to extend in the vertical direction, the shaft 912 is arranged to extend horizontally in a direction (Y1 direction) that intersects with the direction in which the duct 910 extends (X1 direction) in a plan view. Note that the same components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, and description thereof will be omitted.

[0054] 19 and 20 are cross-sectional views of a portion of an air conditioning system 900 according to a first modified example of the fifth embodiment. The air conditioning system 900 includes a plurality of absorption units 920. The plurality of absorption units 920 are disposed within a duct 910. As shown in FIG. 19 , an axis 912 is disposed so as to extend horizontally and in a direction (Y1 direction) intersecting the direction in which the duct 910 extends (X1 direction) in a plan view. This allows each of the absorption units 920 to rotate about the axis 912. As a result, the width D2 of the air passage 913 is variable. The wind speed of the airflow A81 in the air passage 913 is higher than the wind speed of the airflow A82 passing through the absorption unit 920 (a value of 0.02 m / s or more and less than 0.50 m / s). Air entering through the air vent 911 and air flowing within the duct 910 pass through the absorption unit 920.

[0055] 20 , the plurality of absorption units 920 includes a pair of absorption units 920 arranged across the center of the duct 810. This allows the center of the duct 810 to function as an air passage 913. The configuration of the first modified example of the fifth embodiment also makes it possible to change the width (D2) of the air passage 913, thereby adjusting the wind speed within the air passage 913. Note that the other configurations and effects are similar to those of the fifth embodiment.

[0056] [Second Modification of Fifth Embodiment] Next, the configuration of an air conditioning system 1000 according to a second modification of the fifth embodiment will be described with reference to Figures 21 and 22. In the second modification of the fifth embodiment, a plurality of absorption units 1020 are distributed and arranged on the inner surface 1012 of the duct 1010. Note that the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0057] 21 and 22 are cross-sectional views of a portion of an air conditioning system 1000 according to a second modified example of the fifth embodiment. The air conditioning system 1000 includes a plurality of absorption units 1020. The plurality of absorption units 1020 are arranged at predetermined intervals from one another on the inner surface 1012 of a duct 1010. The wind speed of airflow A91 in the air passage 1013 of the duct 1010 is higher than the wind speed of airflow A92 passing through the absorption units 1020 (a value of 0.02 m / s or more and less than 0.50 m / s). The other configurations and effects are the same as those of the fifth embodiment.

[0058] [Third Modification of Fifth Embodiment] Next, the configuration of an air conditioning system 1300 according to a third modification of the fifth embodiment will be described with reference to FIGS. 25 and 26 . FIGS. 25 and 26 are cross-sectional views showing the configuration of an air conditioning system 1300 according to the third modification of the fifth embodiment. As shown in FIGS. 25 and 26 , in the third modification of the fifth embodiment, a cylindrical absorption unit 1320 is disposed on the inner surface 1312 of a duct 1310. The inside of the cylindrical absorption unit 1320 forms an air passage 1313. The wind speed of the airflow A121 in the air passage 1313 of the duct 1310 is higher than the wind speed of the airflow A122 passing through the absorption unit 1320 (a value of 0.02 m / s or more and less than 0.50 m / s). Note that the other configurations and effects are similar to those of the fifth embodiment. 26, the duct 1310 and the absorption unit 1320 are illustrated as being cylindrical, but they may be configured as rectangular frames. The other configurations and effects are the same as those of the fifth embodiment.

[0059] Sixth Embodiment Next, the configuration of a vehicle 1100 according to a sixth embodiment will be described with reference to FIG. 23 . FIG. 23 is a diagram illustrating the configuration of a vehicle 1100 according to the sixth embodiment. As shown in FIG. 23 , in the sixth embodiment, an absorption unit 1120 is disposed inside the vehicle 1100. The absorption unit 1120 is disposed inside (on the machinery compartment side of) a hood 1111 of the vehicle 1100. Air introduced as the vehicle 1100 moves passes through a radiator 1130 and the absorption unit 1120. Most of the air entering the vehicle 1100 passes through an air passage 1113 that passes through the radiator 1130, and a portion passes through the absorption unit 1120. The wind speed of an air flow A101 in the air passage 1113 is higher than the wind speed of an air flow A102 passing through the absorption unit 1120 (a value of 0.02 m / s or more and less than 0.50 m / s). According to the sixth embodiment, even when the vehicle 1100 is provided with the absorption unit 1120, the reaction efficiency of carbon dioxide can be improved and the wind speed in the ventilation path 1113 can be increased.

[0060] [Seventh Embodiment] Next, the configuration of an aircraft 1200 according to a seventh embodiment will be described with reference to Fig. 24 . Fig. 24 is a diagram showing the configuration of the aircraft 1200 according to the seventh embodiment. As shown in Fig. 24 , in the seventh embodiment, an absorption unit 1220 is disposed inside the aircraft 1200. The absorption unit 1220 is disposed inside the fuselage 1210 of the aircraft 1200. Air taken in from the engines 1211 as the aircraft 1200 flies is introduced into the air conditioning system inside the fuselage 1210. The absorption unit 1220 is disposed near an air intake that supplies air to the cabin inside the fuselage 1210, at an exhaust port that discharges air from the cabin or the fuselage 1210, and in a seat. The absorption unit 1220 is disposed in a pillow portion of the seat. The wind speed of an air flow A121 in an air passage 1213 of air inside the fuselage 1210 is higher than the wind speed of an air flow A122 passing through the absorption unit 1220. According to the seventh embodiment, even when the aircraft 1200 is provided with the absorption unit 1220, the wind speed in the air passage 1213 can be increased while improving the reaction efficiency of carbon dioxide.

[0061] [Measurement Results] Next, the measurement results of the reaction efficiency η when air is passed through the absorbing member will be described with reference to Fig. 11 and Fig. 12A. Fig. 11 is a diagram showing the relationship between the wind speed when air is passed through the absorbing member and the reaction efficiency. Fig. 12A is a diagram summarizing the measurement results.

[0062] Here, calcium hydroxide (Ca(OH) ２ An absorbent member having a cylindrical shape with an average diameter Φ of 2.0 mm and a length (height) of 5.0 mm, and an absorbent member having a cylindrical shape with an average diameter Φ of 3.0 mm and a length (height) of 5.0 mm were prepared. The absorbent member contained sulfur trioxide (SO ) as a substance other than calcium hydroxide. ３ ) 0.8% to 0.9%, magnesium oxide (MgO) 0.5%, aluminum oxide (Al ２ O ３ ) 0.2%, silicon dioxide (SiO ２ ) is contained in trace amounts.

[0063] The proportion (reaction rate) of calcium carbonate was measured in a state where air was passed through a prepared absorbent member having an average diameter of 2.0 mm for 100 hours at wind velocities of 0.12 m / s, 0.15 m / s, 0.16 m / s, 0.18 m / s, and 0.2 m / s (hereinafter referred to as "passing wind speed v"). The proportion (reaction rate) of calcium carbonate was also measured in a state where air was passed through a prepared absorbent member having an average diameter of 3.0 mm for 100 hours at wind speeds v of 0.3 m / s, 0.4 m / s, and 0.5 m / s. "Reaction efficiency η" refers to the proportion (reaction rate) of calcium carbonate when air is passed through at the passing wind speed v for a predetermined time (100 hours in this embodiment). Calcium carbonate (CaCO ３ The weight percentage of carbon dioxide (CO₂) detected by the gas volumetric method is calculated by multiplying the CO₂ percentage (%) detected by the gas volumetric method by 100.09 and dividing by 44.01 (in FIG. 11, this is shown as the “measured value”).

[0064] The measured values ​​of the reaction efficiency η of an absorbent member having an average diameter of Φ2.0 mm were 90% when the passing wind speed v was 0.12 m / s, 88% when the passing wind speed v was 0.15 m / s, 80% when the passing wind speed v was 0.16 m / s, 78% when the passing wind speed v was 0.18 m / s, and 75% when the passing wind speed v was 0.2 m / s. The measured values ​​of the reaction efficiency η of an absorbent member having an average diameter of Φ3.0 mm were 64% when the passing wind speed v was 0.3 m / s, 60% when the passing wind speed v was 0.4 m / s, and 51% when the passing wind speed v was 0.5 m / s.

[0065] Here, when the reaction efficiency η when the passing wind speed v is 0.2 m / s is estimated from the measured value of the reaction efficiency η of the absorber having an average diameter Φ of 3.0 mm, it is 67%. Therefore, it was found that, for the same passing wind speed v, the reaction efficiency η (75%) of the absorber having an average diameter Φ of 2.0 mm is greater than the reaction efficiency η (67%) of the absorber having an average diameter Φ of 3.0 mm. Note that the reaction efficiency η when the passing wind speed v is 0.2 m / s is estimated by adding the increase in reaction efficiency η when the passing wind speed v is 0.3 m / s from that of 0.4 m / s to the reaction efficiency η at 0.3 m / s.

[0066] For the absorption member having an average diameter of Φ2.0 mm, an "estimated value" of the "reaction efficiency η" was calculated. The "estimated value" is calculated by dividing the weight of calcium carbonate (CaCO ) by the weight of calcium hydroxide when it reacts 100% (when all calcium hydroxide is converted to calcium carbonate). ３) is used as the numerator. For example, first, the weight and moisture content of the absorbent member before the reaction are measured, and the weight of the absorbent member after the reaction minus the moisture content (referred to as the "pre-reaction dry weight") is calculated. Then, the weight and moisture content of the absorbent member after the reaction are measured, and the weight of the absorbent member after the reaction minus the moisture content (referred to as the "post-reaction dry weight") is calculated. Furthermore, the "post-reaction maximum weight" is calculated, which is the weight of the absorbent member before the reaction when it has completely reacted (when all the calcium hydroxide has turned into calcium carbonate). That is, since the number of moles of calcium hydroxide before the reaction is 74 and the number of moles of calcium carbonate after the reaction is 100, the "pre-reaction dry weight" ÷ 74 × 100 = "post-reaction maximum weight". The reaction efficiency η calculated as "reaction efficiency η" = "post-reaction dry weight" / "post-reaction maximum weight" is shown as an estimated value in Figure 11. All of the estimated values ​​were higher than the actual measured values.

[0067] In FIG. 12A, the passing wind speed v at which the reaction efficiency η was 80% or more is marked with "◎", the passing wind speed v at which the reaction efficiency η was 70% or more but less than 80% is marked with "◯", the passing wind speed v at which the reaction efficiency η was 50% or more but less than 70% is marked with "△", and the passing wind speed v at which the reaction efficiency η was less than 50% is marked with "×". As shown in FIG. 12A, when the passing wind speed v was 0.02 m / s or more but less than 0.15 m / s, it was marked with "◎", and it was found that the reaction efficiency η was the highest. Furthermore, when the passing wind speed v was 0.02 m / s or more but less than 0.18 m / s, it was marked with "◎" or "◯", and it was found that the reaction efficiency η was higher. Furthermore, when the passing wind speed v was less than 0.50 m / s, it was marked with "◎", "◯", or "△", and it was found that the reaction efficiency η was higher than when the passing wind speed v was 0.50 m / s or more.

[0068] 11 and 12A show the results for reaction efficiency η, but the reaction rate decreases after 100 hours of air passage, and the reaction rate saturates (the reaction rate in a saturated state is called the "saturated reaction rate"). As shown in FIG. 12B, for example, if the reaction is further carried out at a passage air velocity v at which the reaction efficiency η (reaction rate per 100 hours) is 80%, the saturated reaction rate will be 95%. Also, if the reaction is further carried out at a passage air velocity v at which the reaction efficiency η (reaction rate per 100 hours) is 60%, the saturated reaction rate will be 73%. Thus, the higher the passage air velocity v at which the reaction efficiency η is, the higher the saturated reaction rate will be.

[0069] Here, when the absorbent member after the reaction is used as a raw material for recycled products (such as glass materials, fertilizers, and cement), the higher the proportion of calcium carbonate, the better the quality of the recycled product and the raw materials for the recycled product. Therefore, if the passing air velocity v is set to 0.02 m / s or more and less than 0.18 m / s, the reaction efficiency will be 70% or more. As a result, for example, in an absorption filter that has been reacted for a predetermined period of time, the proportion of calcium carbonate will be 70% or more. As a result, when calcium carbonate is used as a raw material for recycled products, the quality of the recycled product and the raw materials for the recycled product will be improved. Furthermore, if the passing air velocity v is set to 0.02 m / s or more and less than 0.15 m / s, the reaction efficiency will be 80% or more. As a result, for example, in an absorption filter that has been reacted for a predetermined period of time, the proportion of calcium carbonate will be 80% or more. As a result, when calcium carbonate is used as a raw material for recycled products, the quality of the recycled product and the raw materials for the recycled product will be improved.

[0070] [Modifications] The above-described embodiments are merely examples for implementing the present disclosure. Therefore, the present disclosure is not limited to the above-described embodiments, and can be implemented by appropriately modifying the above-described embodiments within the scope of the present disclosure.

[0071] (1) In the first to fourth embodiments, an air purification filter (HEPA filter) is used as the air purification unit, but the present disclosure is not limited to this. For example, a filter other than a HEPA filter (e.g., a mist filter) or an electrostatic precipitator may be used as the air purification unit.

[0072] (2) In the first to fourth embodiments, the fan is disposed downstream of the air purification filter, but the present disclosure is not limited to this. For example, as in an air purifier 500 according to a modified example shown in Fig. 13, the fan 450, the absorption unit 420, the damper 460 (opening 413), and the air purification filter 430 may be disposed in this order from the upstream side of the airflow A21. In this case, an airflow A22 is generated, introducing air from the opening 413 into the ventilation path 480 between the absorption unit 420 and the air purification filter 430.

[0073] (3) In the first to fourth embodiments, examples have been shown in which the damper is configured to rotate, but the present disclosure is not limited to this. For example, the damper may be configured to slide.

[0074] (4) In the first to fourth embodiments, examples in which a nonwoven fabric filter is provided are shown, but the present disclosure is not limited to this. A nonwoven fabric filter may not be provided inside the housing, or a type of filter other than a nonwoven fabric filter (for example, a mesh filter) may be provided inside the housing.

[0075] (5) In the first to fourth embodiments, as shown in Fig. 1, an example (vertical placement type) in which the housing is configured so that the airflow flows from bottom to top is shown, but the present disclosure is not limited to this. The housing may be configured so that the airflow flows from top to bottom, or the housing may be configured so that the airflow flows from one side to the other side (horizontal placement type).

[0076] (6) In the first to fourth embodiments, the damper is moved between three positions P1 to P3. However, the present disclosure is not limited to this. For example, the damper may be configured to move between two positions: a position that opens the opening and a position that closes the opening.

[0077] (7) In the third embodiment, the fan, air purifying filter, and absorption unit are arranged in this order from the upstream side of the airflow inside the housing. However, the present disclosure is not limited to this. For example, the air purifying filter, fan, and absorption unit may be arranged in this order from the upstream side of the airflow inside the housing.

[0078] (8) Although the first to fourth embodiments described above use an air purifier as an example, the present disclosure is not limited thereto. For example, the carbon dioxide absorbing device 600 may be configured as shown in FIG. 14 . The carbon dioxide absorbing device 600 includes a housing 610, a nonwoven fabric filter 641, an absorption unit 620, and a fan 650. The nonwoven fabric filter 641, the absorption unit 620, and the fan 650 are arranged in this order in the housing 610 from the air intake 613 side. The wind speed of the airflow A41 generated by driving the fan 650 passing through the absorption unit 620 is equal to or greater than 0.02 m / s and less than 0.15 m / s. This wind speed may be equal to or greater than 0.02 m / s and less than 0.50 m / s. This configuration can provide a carbon dioxide absorbing device 600 with high reaction efficiency.

[0079] (9) In the first to fourth embodiments, examples in which a fan is provided have been described, but the present disclosure is not limited thereto. For example, as in the carbon dioxide absorbing device 700 of the example shown in FIG. 15 , in an environment in which the exhaust port 714 is under negative pressure relative to the intake port 713 and the passing air velocity v is a value of 0.02 m / s or more and less than 0.50 m / s, a fan is not necessary and the absorption unit 720 may be provided. Furthermore, in each of the devices described below, the passing air velocity v of the absorption unit may be set to a value of 0.02 m / s or more and less than 0.50 m / s, and other air passages may be configured to be higher than this passing air velocity. For example, the carbon dioxide absorbing device 700 may be disposed in a position where an airflow generated when a mobility (moving object: a vehicle (automobile, train), aircraft, or ship) moves flows, or may be disposed at the boundary between the interior and exterior of an aircraft and utilize the pressure difference between the air pressure outside the aircraft and the air pressure inside the aircraft. Furthermore, the carbon dioxide absorbing device 700 may be disposed under an airflow generated by another air conditioning unit or the like. For example, the carbon dioxide absorbing device of the present disclosure may be applied to air conditioners, ventilation fans, air conditioning ducts, private power generators, or emergency power generators that use fans or compressors. The carbon dioxide absorbing device of the present disclosure may also be applied to the exhaust or intake vents of aircraft, clean rooms, and negative pressure rooms, or the interior of such negative pressure rooms, where airflow is created by a pressure difference. The carbon dioxide absorbing device of the present disclosure may also be applied to devices that take in air by being attached to a moving object, such as a helmet, a car body, or a fan. The carbon dioxide absorbing device of the present disclosure may also be configured to utilize natural airflow.

[0080] (10) In the first to fourth embodiments, the absorbent member is formed to have a cylindrical shape, has an average diameter Φ of 2 mm or more and 3 mm or less, and a length (height) of 5.0 mm, but the present disclosure is not limited to this. That is, the absorbent member may be formed to have a shape other than a cylindrical shape (for example, a spherical shape, a rectangular prism shape, etc.), and may have an average diameter Φ of less than 2 mm or more than 3 mm, and a length (height) of less than 5.0 mm or 5.1 mm or more.

[0081] The above-described carbon dioxide absorbing device and air purifier can be explained as follows.

[0082] An air purifier according to a first configuration includes an absorption filter containing a hydroxide that absorbs carbon dioxide, and a housing in which the absorption filter is disposed. The housing has a first wind speed, which is the wind speed of air passing through the absorption filter, of 0.02 m / s or more and less than 0.50 m / s (first configuration). In the first configuration, the first wind speed may be 0.02 m / s or more and less than 0.18 m / s (second configuration). In the second configuration, the first wind speed may be 0.02 m / s or more and less than 0.15 m / s (third configuration).

[0083] According to the first to third configurations, the reaction efficiency of carbon dioxide can be improved. Here, when a hydroxide-reacted substance is used as a raw material for a recycled product, the higher the proportion of hydroxide-reacted substances, the higher the quality of the recycled product and the raw materials for the recycled product. Therefore, according to the second configuration, the reaction efficiency is 70% or higher. Furthermore, according to the third configuration, the reaction efficiency is 80% or higher. As a result, for example, in an absorption filter that has been reacted for a predetermined period of time, the proportion of hydroxide-reacted substances is 70% or higher (80% or higher in the case of the third configuration). As a result, according to the second and third configurations, when a hydroxide-reacted substance is used as a raw material for a recycled product, the quality of the recycled product and the raw materials for the recycled product is improved.

[0084] An air purifier according to a fourth configuration comprises a fan, an air purification section in which air is ventilated when the fan is driven, an absorption unit housing an absorption filter containing an absorption filter containing a hydroxide that absorbs carbon dioxide, the absorption unit in which air is ventilated when the fan is driven, and a housing in which the fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the fan is driven, is higher than the first wind speed (fourth configuration).

[0085] According to the fourth configuration, the air purification function can be improved while improving the reaction efficiency of carbon dioxide.

[0086] In the fourth configuration, the housing may include an opening that introduces air from outside the housing into the ventilation path through which air flows from the absorption unit to the air purification section, or that exhausts air from the ventilation path through which air flows from the air purification section to the absorption unit to the outside of the housing, and a damper that changes the opening degree of the opening (fifth configuration).

[0087] The absorption efficiency of carbon dioxide by the absorption filter increases as the air velocity passing through the absorption filter decreases. Conversely, the greater the air volume passing through the air purification filter, the greater the amount of purified air, improving the air purification function. According to the above configuration, the opening introduces air from outside the housing into the ventilation path through which air flows from the absorption unit to the air purification unit, or exhausts air to the outside of the housing through the ventilation path through which air flows from the air purification unit to the absorption unit. This allows the air volume passing through the air purification unit to be greater than the air volume passing through the absorption unit. As a result, the amount of purified air increases, improving the air purification function. Furthermore, the damper can adjust the amount of air passing through the opening (the difference between the air volume passing through the air purification unit and the air volume passing through the absorption unit). As a result, air is supplied to the absorption unit at an appropriate air velocity, improving the carbon dioxide reaction efficiency.

[0088] In the fifth configuration, the absorption unit may be configured to accommodate one or more absorption filters. The absorption unit may be configured to allow the one or more absorption filters to be individually detachable (sixth configuration).

[0089] According to the sixth configuration, it is possible to replace only the absorption filters that need to be replaced among the plurality of absorption filters, and it is also possible to standardize the absorption filters.

[0090] In a sixth configuration, the air purifier may further include a control unit that controls the operation of the damper, and a storage unit that stores information correlating the number of absorption filters arranged in the absorption unit with the position of the damper. The control unit obtains the number of absorption filters arranged in the absorption unit, refers to the information based on the number of absorption filters, and changes the position of the damper (seventh configuration).

[0091] The greater the number of absorption filters, the greater the pressure loss in the absorption unit. However, if the air speed passing through the absorption unit changes, the carbon dioxide absorption efficiency in the absorption unit decreases. In contrast, with the seventh configuration, the position of the damper is changed depending on the number of absorption filters, so that the air speed passing through the absorption filters can be set to an appropriate value even if the number of absorption filters is changed.

[0092] In the sixth configuration, the damper may be configured so that the position of the damper can be manually changed. The housing may be provided with a mark that corresponds the number of the absorption filters arranged in the absorption unit to the position of the damper (eighth configuration).

[0093] According to the eighth configuration, the damper can be moved in accordance with the mark, so that even when the damper position is switched manually, the damper position can be adjusted so that the wind speed passing through the absorption filter becomes an appropriate value.

[0094] In any one of the fifth to eighth configurations, the housing may have the absorption unit, the damper, the air purification unit, and the fan arranged in this order from the upstream side of the airflow generated by driving the fan. The opening may be configured to introduce air from outside the housing via the damper into the ventilation path through which air flows from the absorption unit to the air purification unit (ninth configuration).

[0095] According to the ninth configuration, in addition to the air that has passed through the absorption unit, air controlled by the damper is supplied to the air purification section, which allows a larger amount of air to pass through the air purification section.

[0096] In a tenth configuration, the absorption unit, the damper, the air purifying unit, and the fan may be arranged in this order from top to bottom in the housing. A maintenance door for replacing the absorption filter in the absorption unit may be provided on a side of the housing (tenth configuration).

[0097] According to the tenth configuration, the absorption filter can be easily replaced through the maintenance door provided on the side of the housing.

[0098] In any one of the fifth to eighth configurations, the housing may include the fan, the air purifying unit, the damper, and the absorption unit, arranged in this order from the upstream side of the airflow generated by driving the fan. The opening may be configured to exhaust air from the ventilation path through which air flows from the air purifying unit to the absorption unit, via the damper, to the outside of the housing (eleventh configuration).

[0099] According to the eleventh configuration, purified air is supplied to the absorption unit even when the air purifier is used in an environment with a lot of polluted air, thereby preventing the absorption unit from becoming clogged with dust or the like.

[0100] The air purifier of the twelfth configuration comprises a first fan, a second fan, an air purification section through which air is ventilated when the first fan is driven, an absorption unit housing an absorption filter containing an absorption filter containing a hydroxide that absorbs carbon dioxide, and through which air is ventilated when the second fan is driven, and a housing in which the first fan, the second fan, the air purification section, and the absorption unit are arranged, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the second fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the first fan is driven, is higher than the first wind speed (twelfth configuration).

[0101] According to the twelfth configuration, the air purification function can be improved while improving the reaction efficiency of carbon dioxide.

[0102] The carbon dioxide absorption device according to the thirteenth configuration comprises an absorption unit that houses an absorption filter containing a hydroxide that absorbs carbon dioxide, the absorption unit through which air passes, and a housing in which the absorption unit is arranged, the housing being configured so that a first wind speed, which is the wind speed of the air passing through the absorption unit, is a value of 0.02 m / s or more and less than 0.50 m / s, and the housing includes an air passage through which air passes at a second wind speed that is a wind speed higher than the first wind speed.

[0103] According to the thirteenth configuration, the reaction efficiency of carbon dioxide can be improved while increasing the wind speed in the ventilation path.

[0104] In a thirteenth configuration, the housing may form a part of an air duct. The absorption unit may be disposed within the air duct (fourteenth configuration).

[0105] According to the fourteenth configuration, even when the absorption unit is disposed inside the ventilation duct, the air velocity can be ensured by the ventilation path, and the reaction efficiency of carbon dioxide can be improved.

[0106] In the fourteenth configuration, the absorption unit may be configured to have a cylindrical shape (fifteenth configuration).

[0107] According to the fifteenth configuration, the inside of the cylindrical absorption unit can be configured as an air passage, so when the absorption unit is disposed inside the ventilation duct, there is no need to configure a separate air passage in the housing.

[0108] In the thirteenth to fifteenth configurations, the carbon dioxide absorbing device may further include an air passage width changing mechanism that changes the width of the air passage by moving the absorption unit (sixteenth configuration).

[0109] According to the sixteenth configuration, the width of the air passage can be changed, so that the second air velocity can be adjusted.

[0110] In the thirteenth to fifteenth configurations, the housing may be a housing for a vehicle, and the air passage may include an air passage that passes air to a radiator of the vehicle (seventeenth configuration).

[0111] According to the seventeenth configuration, even when a carbon dioxide absorbing device is provided in a vehicle, the reaction efficiency of carbon dioxide can be improved while increasing the wind speed in the air passage.

[0112] In the thirteenth to fifteenth configurations, the housing may be a housing of an aircraft. The absorption unit may be fixed to any one of a seat, an air intake, or an exhaust outlet in the aircraft (an eighteenth configuration).

[0113] According to the eighteenth configuration, even when a carbon dioxide absorbing device is provided on an aircraft, the reaction efficiency of carbon dioxide can be improved while increasing the wind speed in the air passage.

[0114] 3: Air purifying filter, 10: Housing, 11: Intake port, 12: Exhaust port, 13: Opening, 14: Maintenance door, 15: Wheels, 20: Absorption unit, 21: Absorption filter, 21a: Absorption member, 21b: Case, 21c: Two-dimensional code, 30: Air purifying filter, 41: Nonwoven fabric filter, 42: Nonwoven fabric filter, 50: Fan, 60: Damper, 70: Control circuit, 71: Memory unit, 72: Number sensor, 80: Ventilation path, 100: Air purifier, 200: Air purifier, 210: Housing, 260: Damper, 261: Mark, 270: Control circuit, 300: Air purifier, 31 0: Housing, 313: Opening, 315: Net, 320: Absorption unit, 330: Air purification filter, 350: Fan, 360: Damper, 380: Ventilation path, 400: Air purifier, 413: Opening, 420: Absorption unit, 430: Air purification filter, 450: Fan, 460: Damper, 480: Ventilation path, 500: Air purifier, 510: Housing, 511a: Air purifier intake port, 511b: Absorption unit intake port, 514a: Air purifier exhaust port, 514b: Absorption unit exhaust port, 520: Absorption unit, 530: Air purification filter, 541: Nonwoven fabric filter, 5 42: nonwoven fabric filter, 551: first fan, 552: second fan, 600: carbon dioxide absorption device, 610: housing, 613: air intake port, 620: absorption unit, 641: nonwoven fabric filter, 650: fan, 700: carbon dioxide absorption device, 713: air intake port, 714: exhaust port, 720: absorption unit, 800: air conditioning system, 810: duct, 811: air vent, 812: shaft, 813: air passage, 820: absorption unit, 831: blower, 832: air purification section, 833: valve, 834a: valve, 834b: valve, 834c: valve, 900: air conditioning system, 910: duct, 911: vent, 912: shaft, 913: air passage, 920: absorption unit, 1000: air conditioning system, 1010: duct, 1012: inner surface, 1013: air passage, 1020: absorption unit, 1100: vehicle, 1111: bonnet, 1113: air passage, 1120: absorption unit, 1130: radiator, 1200: aircraft, 1210: fuselage, 1211: engine, 1213: air passage, 1220: absorption unit, 1300: air conditioning system, 1310: duct, 1312: inner surface, 1313: air passage, 1320: absorption unit, A1: air flow, A101: air flow,A102: airflow, A11: airflow, A12: airflow, A121: airflow, A122: airflow, A2: airflow, A21: airflow, A22: airflow, A31: airflow, A32: airflow, A41: airflow, A61: airflow, A62: airflow, A81: airflow, A82: airflow, A91: airflow, A92: airflow, E11: air inlet, G11: exhaust port, G12: exhaust port, G13: exhaust port, v: passing air speed, Φ: average diameter, η: reaction efficiency,

Claims

1. An air purifier comprising: a fan; an air purification section through which air is ventilated when the fan is driven; an absorption unit housing an absorption filter containing a hydroxide that absorbs carbon dioxide, the absorption unit through which air is ventilated when the fan is driven; and a housing in which the fan, the air purification section and the absorption unit are arranged, the housing including: an opening for introducing air from outside the housing into an air passage through which air flows from the absorption unit to the air purification section, or for discharging air to the outside of the housing from the air passage through which air flows from the air purification section to the absorption unit; and a damper for changing the opening degree, wherein a first wind speed, which is the wind speed of air passing through the absorption unit when the fan is driven, is a value of 0.02 m / s or more and less than 0.50 m / s, and a second wind speed, which is the wind speed of air passing through the air purification section when the fan is driven, is higher than the first wind speed.

2. The air purifier according to claim 1, wherein the absorption unit is configured to be capable of housing one or more absorption filters, and the absorption unit is configured so that the one or more absorption filters are individually detachable.

3. An air purifier as described in claim 2, further comprising a control unit that controls the operation of the damper, and a memory unit that stores information correlating the number of absorption filters arranged in the absorption unit with the position of the damper, wherein the control unit obtains the number of absorption filters arranged in the absorption unit, refers to the information based on the number of absorption filters, and changes the position of the damper.

4. An air purifier as described in claim 2, wherein the damper is configured so that its position can be manually changed, and the housing is provided with markings that correspond to the number of absorption filters arranged in the absorption unit and the position of the damper.

5. An air purifier as described in claim 1, wherein the absorption unit, the damper, the air purification section, and the fan are arranged in that order in the housing from the upstream side of the airflow generated by driving the fan, and the opening introduces air from outside the housing via the damper into the ventilation path through which air flows from the absorption unit to the air purification section.

6. An air purifier as described in claim 5, wherein the absorption unit, the damper, the air purification section, and the fan are arranged in that order from top to bottom in the housing, and a maintenance door is provided on a side of the housing for replacing the absorption filter in the absorption unit.

7. The air purifier of claim 1, wherein the fan, the air purification section, the damper, and the absorption unit are arranged in that order in the housing from the upstream side of the airflow generated by driving the fan, and the opening exhausts air from the ventilation path through which air flows from the air purification section to the absorption unit, via the damper, to the outside of the housing.

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