CN112325435A - Air supply device - Google Patents
Air supply device Download PDFInfo
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- CN112325435A CN112325435A CN201911388274.1A CN201911388274A CN112325435A CN 112325435 A CN112325435 A CN 112325435A CN 201911388274 A CN201911388274 A CN 201911388274A CN 112325435 A CN112325435 A CN 112325435A
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- China
- Prior art keywords
- air
- oxygen
- supply device
- air supply
- adjustment unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/56—Polyamides, e.g. polyester-amides
Abstract
The present invention provides an air supply device (10) comprising: a pressurizing part (12); an adjusting unit (16) that adjusts the oxygen content of the air pressurized by the pressurizing unit (12) and generates low-oxygen air having an oxygen content lower than that of the air from the air; a collective container (22) into which air that has not passed through the adjustment unit (16) and hypoxic air generated by the adjustment unit (16) are introduced; and a supply pipe (24) for supplying the hypoxic air in the collection container (22) to the room (R). This makes it possible to prevent the distribution of the oxygen content from varying in the room to which the hypoxic air is supplied.
Description
Technical Field
The present invention relates to an air supply device for supplying hypoxic air.
Background
As disclosed in japanese patent laid-open publication No. h 11-276635, an air supply device is known that supplies hypoxic air to a room in which a hypoxic environment is created, such as a training room. An air supply device disclosed in japanese patent laid-open publication No. 11-276635 includes a low oxygen generation device, a first pipe that supplies low oxygen air generated in the low oxygen generation device to a training room, and a second pipe that supplies normal air to the training room.
In the air supply device disclosed in japanese patent laid-open publication No. 11-276635, hypoxic air is supplied to the training room through a first pipe, and normal air is supplied to the training room through a second pipe. Therefore, the distribution of the oxygen content rate is likely to vary in the training room.
Disclosure of Invention
The invention aims to provide an air supply device which is difficult to generate the dispersion of the distribution of the oxygen content in the room of the low-oxygen air supply object.
An air supply device according to an aspect of the present invention is an air supply device for supplying air lower in oxygen than the atmosphere to a designated room, including: an adjustment unit that adjusts the oxygen content of air and generates hypoxic air having a lower oxygen content than the air; a collective container into which air that has not passed through the adjustment unit and the hypoxic air generated by the adjustment unit are introduced; and a supply pipe that delivers hypoxic air within the collection container to the designated room.
According to the present invention, the distribution of the oxygen content is less likely to vary in the room to which the hypoxic air is supplied.
Drawings
Fig. 1 is a schematic view of an air supply device according to a first embodiment.
Fig. 2 is a schematic view of an air supply device according to a second embodiment.
Fig. 3 is a schematic view of an air supply device according to a third embodiment.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings.
(first embodiment)
The air supply device according to the present embodiment is a device for supplying hypoxic air to a specified room (a demand side) such as a training room or an artificial weather room that requires air having an oxygen content different from that of normal air. In addition, the designated room may be a permanent building, or may also be a movable or temporary structure. The designated room does not require pressure resistance and vacuum resistance, but preferably has a certain degree of airtightness so as to be able to maintain the air composition ratio in the space.
As shown in fig. 1, the air supply device 10 includes a pressurizing unit 12, an introduction pipe 14, an adjusting unit 16, a connecting unit 18, a blower 20, a collection container 22, and a supply pipe 24.
The pressurizing unit 12 is an element for pressurizing air (atmosphere) which is outside air, and the pressurizing unit 12 includes a compressor 12a for compressing air. The compressor 12a includes an intake portion for taking in normal air, a compression mechanism for compressing the taken-in air, and a discharge portion for discharging the air compressed by the compression mechanism. The oxygen content of the air discharged from the compressor 12a is the same as the oxygen content of the air sucked in. The normal air is air having the same oxygen content as that of the atmosphere.
One end of the introduction pipe 14 is connected to the discharge portion of the compressor 12 a. The other end of the introduction tube 14 is connected to the adjustment portion 16. Therefore, the air compressed by the compressor 12a is introduced into the adjusting portion 16 through the introduction pipe 14. In other words, the portion on the introduction side in the adjustment portion 16 is held at a pressure of the degree of the discharge pressure of the compressor 12 a.
A valve 14a for adjusting the flow rate of air discharged from the compressor 12a and introduced into the adjusting portion 16 is disposed in the introduction pipe 14. The flow rate of air introduced into the adjusting unit 16 through the introducing pipe 14 can be adjusted by adjusting the opening degree of the valve 14 a. The opening degree of the valve 14a is adjusted by an administrator or the like of the room R and is fixed.
The adjusting unit 16 is used to generate hypoxic air with a lower oxygen content from the air introduced through the introduction pipe 14. Specifically, the adjustment unit 16 includes a housing 16a and a film body 16b housed in the housing 16 a. The membrane 16b has a property of having different oxygen permeability and nitrogen permeability.
The membrane 16b may be formed of an organic membrane using a polymer material such as cellulose acetate, polysulfone, polycarbonate, or polyimide, or may be formed of an inorganic membrane using an inorganic material such as silica, alumina, zeolite, or porous glass. When the membrane 16b is formed of an organic film, the oxygen permeability varies depending on the pressure difference between the pressure applied to the pressurizing section 12 side of the membrane 16b and the pressure applied to the collecting container 22 side. If the discharge pressure of the compressor 12a is maintained at a predetermined pressure and the flow resistance in the later-described connection part 18 is constant, the oxygen permeability in the membrane 16b is stabilized. Therefore, the discharge pressure of the compressor 12a is set to a pressure of air at which a desired oxygen content can be obtained at the adjustment portion 16.
The membrane body 16b is preferably a hollow fiber membrane. In the present embodiment, the membrane body 16b is formed of a hollow fiber membrane. The air compressed by the compressor 12a is introduced from one end of the casing 16a into the membrane 16b formed of the hollow fiber membrane. In the present embodiment, the film body 16b is formed of a film body 16b having a property of higher oxygen permeability than nitrogen permeability, such as a polyimide film. Therefore, the oxygen content of the air led out from the inside of the membrane 16b to the outside of the adjusting portion 16 is lower than the oxygen content of the air led into the adjusting portion 16. On the other hand, the space outside the membrane 16b in the case 16a is filled with high-oxygen air having an oxygen content higher than that of normal air. The adjusting unit 16 can generate low-oxygen air lower than a set value of an oxygen content rate described later.
The space inside the membrane 16b communicates with the internal space of the collecting container 22 through the connecting portion 18, and the space outside the membrane 16b inside the casing 16a is opened to the atmosphere through the discharge port 16 c. Therefore, the high oxygen content air having passed through the membrane 16b is discharged from the discharge port 16c of the casing 16a to the outside of the casing 16a, and the low oxygen content air having not passed through the membrane 16b is introduced into the collecting container 22 through the connecting portion 18. In the present embodiment, the connection portion 18 is formed by 1 pipe. In this case, the connection portion 18 is connected to the case 16a so as to communicate with the space outside the membrane 16b in the case 16a, and the discharge port 16c communicates with the space inside the membrane 16 b.
The adjusting unit 16 is not limited to the structure having the membrane 16b, and may be a structure using a Pressure Swing Adsorption (PSA) mechanism. In the configuration using the pressure swing adsorption mechanism, if the discharge pressure of the compressor 12a is maintained at a predetermined pressure and the flow resistance in the connection portion 18 is constant, the oxygen removal rate is also stable.
A blower pipe 26 through which air sent from the blower 20 flows is connected to the collection container 22. The blower 20 is disposed to send out normal air as outside air, and the air flow from the blower 20 flows through the blower duct 26. Therefore, the hypoxic air guided out from the adjustment portion 16 and the normal air sent out from the blower 20 flow into the collective container 22. In the manifold container 22, the hypoxic air and the air of a typical oxygen content rate are mixed together.
A check valve 28 that allows the flow of air from the blower 20 and prevents the flow of air from the collection container 22 to the blower 20 is disposed in the blower pipe 26. Therefore, the air flows from the blower 20 toward the collection container 22, and the hypoxic air in the collection container 22 does not leak toward the blower 20.
A supply pipe 24 is connected to the collecting container 22. The supply pipe 24 is a pipe for supplying the hypoxic air in the collection container 22 to the designated room R. The supply pipe 24 includes a main pipe 24a connected to the collection container 22 and a plurality of branch pipes 24b branched from the main pipe 24 a. That is, the supply pipe 24 branches halfway. The branch pipes 24b are connected to different portions at partitioning portions (any of a ceiling, a wall, and a floor) constituting the room R. For example, the first branch pipe 24b is connected to a ceiling, the second branch pipe 24b is connected to a wall, and the third branch pipe 24b is connected to a wall opposite to the wall. This allows hypoxic air to flow into the room R from a plurality of locations.
An oxygen sensor 30 for detecting the oxygen content in the air in the room R is disposed in the room R. The oxygen sensor 30 outputs a signal indicating the detected oxygen content. The output signal is input to the controller 32.
The controller 32 controls the blower 20 using a detection signal from the oxygen sensor 30. Specifically, the controller 32 includes: an input unit 32a for setting the oxygen content in the air in the room R; a storage unit 32b for storing the set oxygen content; and a control unit 32c for controlling the blower 20 based on the difference between the set value of the oxygen content and the detected oxygen content. For example, if the set value of the oxygen content rate is 14.5%, the control unit 32c increases the air blowing amount of the blower 20 if the detection value of the oxygen sensor 30 is 13.5%. When the set oxygen content is 14.5%, if the detection value of the oxygen sensor 30 is 18%, the control unit 32c decreases the air blowing amount of the blower 20. Thereby, the control unit 32c adjusts the rotation number of the blower 20 according to the magnitude of the difference between the set value and the detection value. That is, the blower 20 is controlled such that the amount of air blown by the blower 20 increases as the degree of decrease in the detection value with respect to the set value increases.
The capacity of the compressor 12a is set based on the air volume of the blower 20, the flow rate of the hypoxic air flowing out from the adjustment unit 16, and the ventilation volume in the room R. More specifically, assuming that the air volume of the blower 20 is q1, the flow rate (i.e., the ventilation rate) of the air entering the room R due to opening and closing of the door of the room R is q2, the flow rate of the hypoxic air flowing out of the adjustment unit 16 is V, and the oxygen content of the hypoxic air flowing out of the adjustment unit 16 is C, the following relationship holds true when the set value of the oxygen content of the air in the room R is 14.5%.
0.21×(q1+q2)+C×V＝0.145×(q1+q2+V)
The capacity of the compressor 12a needs to be a compressor capacity capable of supplying the flow rate V capable of establishing the above-described relational expression and the air quantity and pressure capable of obtaining the low-oxygen air with the oxygen content C to the adjusting portion 16. The air volume q1 of the blower 20 is adjustable, but the compressor capacity capable of obtaining the flow rate V of the hypoxic air flowing out from the adjustment unit 16 is set to the capacity of the compressor 12a so as to satisfy the above-described relational expression regardless of whether the set value of the oxygen content rate of the air in the room R is the minimum concentration or the maximum concentration. In addition, the flow rate q2 of the air entering the room R can be obtained through experiments. When the flow rate V of the hypoxic air flowing out from the adjustment unit 16 is determined, it is also considered that the carbon dioxide content in the room R does not increase to a fixed value or more due to the carbon dioxide generated from the people in the room R.
In the air supply device 10 configured as described above, if the compressor 12a is operated, the compressor 12a takes in outside air (normal air) and compresses the outside air in the compression mechanism. Further, since the compressor 12a is driven at a constant rotation number, the pressure of the air discharged from the compressor 12a is stable and the flow rate is also constant. The flow rate of air flowing into the adjusting unit 16 is adjusted by a valve 14a disposed in the inlet pipe 14.
The compressed air having a predetermined pressure is introduced into the space inside the membrane 16b of the adjustment portion 16 through the introduction pipe 14. That is, the film body 16b is applied with a predetermined pressure. Accordingly, the oxygen permeability and the nitrogen permeability are stabilized in the membrane 16b of the adjustment portion 16. The film body 16b is formed of a film body having a property of higher oxygen permeability than nitrogen permeability. Therefore, the space outside the membrane 16b in the casing 16a is filled with the high oxygen air, and the high oxygen air is discharged to the outside of the casing 16a through the discharge port 16 c. On the other hand, the space inside the membrane 16b in the casing 16a is filled with hypoxic air, which is introduced into the collecting container 22 through the connecting portion 18.
In addition to the hypoxic air, air blown from the blower 20 also flows into the collective container 22. The blower 20 is controlled based on the detection value of the oxygen sensor 30 disposed in the room R. That is, the rotation number of the blower 20 is controlled according to the magnitude of the difference between the detection value of the oxygen sensor 30 and the set value of the oxygen content rate. Therefore, the air with the adjusted air volume flows from the blower 20 into the collecting container 22. Accordingly, the oxygen content of the air contained in the collective container 22 becomes a predetermined content.
Hypoxic air with an oxygen content rate that is a predetermined content rate is supplied to the room R through the supply pipe 24. At this time, the hypoxic air is branched from the main pipe 24a of the supply pipe 24 to the branch pipes 24b, and is supplied to the room R through the branch pipes 24 b.
As described above, in the present embodiment, the normal air sent from the blower 20 and the low-oxygen air whose oxygen content has been adjusted by the adjusting unit 16 are introduced into the collecting container 22 and mixed in the collecting container 22. The hypoxic air mixed in the collecting container 22 is supplied to the room R. That is, the oxygen content rate may be adjusted in advance in the collecting container 22, and then the air may be supplied into the room R. Therefore, the occurrence of variation in the distribution of the oxygen content rate in the room R can be suppressed.
In the present embodiment, the adjustment unit 16 includes the film body 16b having different properties of oxygen permeability and nitrogen permeability. Therefore, the oxygen ratio contained in the air after passing is lower than the oxygen ratio in the introduced air, based on the difference between the oxygen permeability and the nitrogen permeability in the membrane 16 b. Therefore, air having different oxygen content can be generated with a simpler configuration.
In the present embodiment, the air introduced into the adjusting portion 16 is pressurized by the pressurizing portion 12. Therefore, even when a pressure loss occurs when the adjusting portion 16 adjusts the oxygen content of the air, the air can be supplied to the adjusting portion 16 against the pressure loss. Thereby, the pressure for obtaining the effect of reducing the oxygen content can be supplied. Further, in the membrane 16b, the oxygen content is adjusted according to the degree of pressurization of the air in the pressurization part 12. That is, the pressure at the introduction side of the membrane 16b is adjusted to a predetermined pressure by the pressurization unit 12, and the oxygen content of the membrane 16b on the collection container 22 side is within a predetermined range. Therefore, the supply pressure by the pressurizing unit 12 is stabilized, and the low-oxygen air having a predetermined oxygen content can be obtained by the adjusting unit 16. As a result, the oxygen ratio of the air introduced into the collecting container 22 also converges in the predetermined range. Further, the oxygen content of the air in the collecting container 22 can be finely adjusted by adjusting the air volume of the blower 20.
In the present embodiment, the capacity of the compressor 12a is set based on the air volume of the blower 20, the flow rate of the hypoxic air flowing out from the adjustment unit 16, and the ventilation volume of the room R. That is, the capacity of the compressor 12a is set to: even in the case where air leaks from the room R or carbon dioxide is generated in the room R due to a person in the room R, it is possible to absorb this. Therefore, the variation in the oxygen content of the air in the room R can be effectively suppressed.
In the present embodiment, the blower 20 is controlled based on the difference between the detection value of the oxygen sensor 30 and the set value of the oxygen content rate. Therefore, the oxygen content of the air in the room R can be brought close to the set value.
The oxygen content in the air in the collection container 22 is adjusted by adjusting the amount of air blown into the collection container 22 by the blower 20. Therefore, control for adjusting the oxygen content of the air in the room R is not easily complicated.
In the present embodiment, since the check valve 28 is disposed in the air blowing pipe 26, the hypoxic air in the collection container 22 can be prevented from leaking to the air blower 20 side. This enables the low-oxygen air generated by the adjustment unit 16 to be effectively used.
In the present embodiment, since the supply pipe 24 includes the plurality of branch pipes 24b branching from the main pipe 24a, the low-oxygen air having the same oxygen content can be supplied from a plurality of locations constituting the partition portion of the room R. This can suppress the occurrence of a variation in the oxygen content rate in the room R. Further, only the main pipe 24a is connected to the collecting container 22. Therefore, even when the distribution of the oxygen content rate varies in the collecting container 22, air having the same oxygen content rate flows into the main pipe 24 a. This makes it possible to supply air having a more stable oxygen content than in the case where the collective container 22 and the predetermined room R are connected by a plurality of pipes.
(second embodiment)
Fig. 2 shows a second embodiment of the present invention. Here, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the first embodiment, the connection portion 18 that connects the adjustment portion 16 and the collective container 22 is formed by one pipe. In contrast, in the second embodiment, the connection portion 18 includes a plurality of pipes 18a provided in parallel with each other.
Specifically, the connection portion 18 includes: an upstream pipe 18b connected to the adjusting portion 16; a plurality of pipes 18a connected to the upstream pipe 18b so as to branch from the upstream pipe 18 b; and a downstream pipe 18c connecting the plurality of pipes 18a and the collecting container 22. The upstream pipe 18b is connected to the casing 16a so as to communicate with an inner space or an outer space of the membrane 16b in the casing 16 a. For example, when the membrane 16b is formed of a membrane having a property of higher oxygen permeability than nitrogen permeability, the upstream pipe 18b is connected to the casing 16a so as to communicate with the space inside the membrane 16b in the casing 16 a. On the other hand, when the membrane 16b is formed of a membrane 16b having a property that the oxygen permeability is lower than the nitrogen permeability, the upstream pipe 18b is connected to the casing 16a so as to communicate with the space outside the membrane 16b in the casing 16 a.
In fig. 2, the intermediate portion of the connection portion 18 is branched into the plurality of pipes 18a, but the present invention is not limited thereto, and the plurality of pipes 18a may be directly connected to the adjustment portion 16 and connected to the collective container 22. That is, the connection portion 18 may be formed by a plurality of pipes 18a, and the upstream pipe 18b and the downstream pipe 18c may be omitted.
A valve 35 for opening and closing the pipe 18a and a throttle 36 for reducing the flow path area in the pipe 18a are disposed in each of the pipes 18 a. The respective throttle portions 36 are configured to have different flow passage areas. Each valve 35 is selectively opened. Therefore, the flow path resistance in the connection portion 18 can be changed depending on which valve 35 is opened and the degree of change in the pressure loss in the pipe 18 a. Thus, the pressure on the side of the collective container 22 of the adjustment portion 16 can be adjusted according to which valve 35 is opened. As a result, the pressure difference between the pressure applied to the membrane at the pressure side of the pressurizing part 12 and the pressure at the pressure of the collection container 22 can be changed, and the oxygen content of the air permeating through the membrane 16b can be adjusted.
The adjusting unit 16 is not limited to the structure having the membrane 16b, and may be a structure using a pressure swing adsorption mechanism.
The throttle portion 36 may be a valve (for example, a proportional valve) whose flow passage area can be changed. In this case, the connection portion 18 may be formed of one pipe without a plurality of pipes 18 a. That is, a valve capable of changing the flow passage area of the pipe is disposed in the pipe connecting the adjusting portion 16 and the collecting container 22.
While the description of other structures, operations, and effects is omitted, the description of the first embodiment can be applied to the second embodiment.
(third embodiment)
Fig. 3 shows a third embodiment of the present invention. Here, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The first and second embodiments are configured to discharge the high oxygen content air to the outside by using the low oxygen content air obtained by the adjusting unit 16. In contrast, in the third embodiment, a configuration is adopted in which not only low-oxygen air but also high-oxygen air is used.
The membrane 16b is formed of a membrane 16b having a property that the oxygen permeability is higher than the nitrogen permeability. Therefore, the connection portion 18 is connected to the case 16a so as to communicate with the space inside the film body 16b in the case 16 a. On the other hand, the second connection portion 40 is connected to the case 16a so as to communicate with the space outside the film body 16b in the case 16 a.
The second connecting portion 40 is connected to a second collecting container 42. That is, the high oxygen air obtained by the adjusting unit 16 is introduced into the second collective container 42. A mechanism 44 for reducing the carbon dioxide content is disposed in the second connection portion 40 which is a pipe connecting the adjustment portion 16 and the second collective container 42. That is, when the membrane 16b is a membrane that has a higher oxygen permeability than nitrogen permeability and allows carbon dioxide to pass through well, such as a polyimide hollow fiber membrane, carbon dioxide can easily flow into the second collection container 42 through the second connection portion 40. Therefore, the second connection portion 40 is provided with a mechanism 44 for reducing the carbon dioxide content.
A second air supply duct 46 into which air sent from a second air blower 50 is introduced is connected to the second collection container 42. Therefore, the high oxygen air obtained by the adjustment unit 16 and the air having the normal oxygen concentration from the second blower 50 flow into the second collective container 42. A check valve 48 that allows the flow of air from the second blower 50 and prevents the flow of air from the second collection container 42 to the second blower 50 is disposed in the second blower pipe 46.
The second collecting container 42 is communicated with the second room R2 through the second supply pipe 54. The second room R2 is a room that requires air having an oxygen content higher than that in the atmosphere. Therefore, the high oxygen air stored in the second collective container 42 is supplied to the second room R2.
The second supply pipe 54 is a pipe for supplying the high oxygen air in the second collecting container 42 to the second room R2. The second supply pipe 54 includes: a second main pipe 54a connected to the second collecting container 42; and a plurality of second branch pipes 54b branched from the second main pipe 54 a. The second branch pipes 54b are connected to different portions at a partition portion (any one of a ceiling, a wall, and a floor) constituting the second room R2.
The second blower 50 is controlled by the controller 32 based on the detection value of the second oxygen sensor 56 disposed in the second room R2. Specifically, the control unit 32c of the controller 32 adjusts the rotation number of the second blower 50 according to the magnitude of the difference between the set value of the oxygen content rate in the second room R2 and the detection value of the second oxygen sensor 56. Therefore, the control unit 32c adjusts the rotation number of the second blower 50 based on the difference value when the detection value of the second oxygen sensor 56 is higher than the set value. When the detection value of the second oxygen sensor 56 is lower than the set value, the control unit 32c decreases the air flow rate of the second blower 50.
In the third embodiment, not only the low-oxygen air but also the high-oxygen air is generated in the adjusting portion 16. The hypoxic air generated in the adjustment unit 16 is supplied to the room R through the collective container 22, and the hypoxic air generated in the adjustment unit 16 is supplied to the second room R2 through the second collective container 42. Therefore, air having a required oxygen content can be supplied to each of the room R using low-oxygen air and the room R2 using high-oxygen air.
In the third embodiment, the adjusting portion 16 includes a membrane body 16b, such as a polyimide hollow fiber membrane, which has a higher oxygen permeability than nitrogen permeability and allows carbon dioxide to permeate therethrough well. On the other hand, a mechanism 44 for reducing the carbon dioxide content is disposed in the second connection portion 40 through which the high-oxygen air flows. Therefore, the second room R2 can suppress the carbon dioxide content.
In addition, in the third embodiment, the film body 16b may be formed of a film body 16b having a property that the oxygen permeability is lower than the nitrogen permeability. At this time, the connection portion 18 is connected to the case 16a so as to communicate with the space outside the film 16b in the case 16a, and the second connection portion 40 is connected to the case 16a so as to communicate with the space inside the film 16b in the case 16 a.
When the membrane body 16b provided in the adjustment portion 16 has the same properties of carbon dioxide permeability and oxygen permeability, the mechanism 44 for reducing the carbon dioxide content may be omitted.
While descriptions of other structures, operations, and effects are omitted, the descriptions of the first and second embodiments may be applied to the third embodiment.
The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The present invention is not limited to the above-described embodiments, and various changes, modifications, and the like can be made without departing from the scope of the invention. For example, in the above embodiment, the pressurizing portion 12 has a structure including the compressor 12a, but is not limited thereto. When the pressure loss of the adjusting portion 16 is not large, the pressurizing portion 12 may be configured to include a blower instead of the compressor 12 a.
In the above embodiment, all of the air compressed by the compressor 12a is introduced into the adjusting unit 16, but a part of the compressed air may be introduced into the collective container 22 without passing through the adjusting unit 16, and the oxygen content of the air in the collective container 22 may be adjusted. In this case, the blower 20 may be omitted.
In the third embodiment, the second blower 50 is provided, but the second blower 50 may be omitted. In this case, a part of the air compressed by the compressor 12a may be introduced into the second collecting container 42 without passing through the adjusting portion 16.
In the above embodiment, the capacity of the compressor 12a is set based on the air volume of the blower 20, the flow rate of the hypoxic air flowing out from the adjustment unit 16, and the ventilation volume in the room R, but is not limited thereto. The compressor 12a having a capacity larger than the capacity determined based on these values may be used.
When the room R is airtight and the entrance and exit of people are small, the controller 32 may be omitted to control the blower 20 based on the difference between the detection value of the oxygen sensor 30 and the preset oxygen content rate, so that the rotation number of the blower 20 is constant.
The check valve 28 may also be omitted in the case where hypoxic air is allowed to flow out from the collection container 22 towards the blower 20.
In the above-described embodiment, the main pipe 24a of the supply pipe 24 is branched into the plurality of branch pipes 24b, but when the volume of the room R is small, the supply pipe 24 may be formed of one pipe that is not branched.
Here, the embodiments are described in general.
(1) The air supply device according to the embodiment is used for supplying air lower in oxygen than the atmosphere to a specified room, and includes: an adjustment unit that adjusts the oxygen content of air and generates hypoxic air having a lower oxygen content than the air; a collective container into which air that has not passed through the adjustment unit and the hypoxic air generated by the adjustment unit are introduced; and a supply pipe that delivers hypoxic air within the collection container to the designated room.
In the air supply device, normal air that does not pass through the adjustment unit and hypoxic air whose oxygen content rate is adjusted by the adjustment unit are introduced into the collective container and mixed in the collective container. The hypoxic air mixed in the collection container is supplied to the designated room. That is, the oxygen content rate may be adjusted in advance in the collective container, and then the air may be supplied to a designated room. Therefore, the occurrence of variation in the distribution of the oxygen content in the specified room can be suppressed.
(2) The air supply device may include a blower, and in this case, the air that does not pass through the adjustment unit may be blown out of the blower and introduced into the collection container through a blower pipe. In this configuration, the air blown from the blower is introduced into the collective container without passing through the adjustment portion.
(3) In the air supply device, the adjustment portion may include a membrane body having a property of differing oxygen permeability and nitrogen permeability.
In this configuration, the oxygen content of the air after passing through is lower or higher than the oxygen content of the introduced air, based on the difference between the oxygen permeability and the nitrogen permeability of the membrane body. Therefore, air having different oxygen contents can be generated with a simpler configuration.
(4) The air supply device may further include: a pressurizing part for pressurizing air; and an introduction pipe that introduces the air pressurized by the pressurization unit into the adjustment unit.
In this configuration, the air introduced into the adjusting portion is pressurized by the pressurizing portion. Therefore, even when a pressure loss occurs when the adjusting portion adjusts the oxygen content of the air, the air can be supplied to the adjusting portion against the pressure loss. Thereby, the pressure for obtaining the effect of reducing the oxygen content can be supplied. When the adjusting portion has a membrane body, the oxygen content in the membrane body is adjusted according to the degree of pressurization of the air applied by the pressurizing portion. Therefore, when the supply pressure of the pressurizing unit is stable, the low-oxygen air having a predetermined oxygen content can be obtained in the adjusting unit.
(5) The air that does not pass through the regulating portion may be a part of the air pressurized by the pressurizing portion. In this configuration, since the pressurizing portion is used as a supply source of the air that is not introduced into the collecting container by the adjusting portion, an increase in the supply source of the air can be suppressed.
(6) The pressurizing portion may be provided with a compressor that compresses air. In this case, the capacity of the compressor may be set based on the flow rate of the air that is not sent to the collective container by the adjustment unit, the flow rate of the hypoxic air that flows out from the adjustment unit, and the ventilation volume of the specified room
In this configuration, even when leakage of air from a predetermined room is assumed, the oxygen content can be stabilized, and even when the carbon dioxide concentration of the air in the room increases due to presence of a person in the room, the increase can be absorbed.
(7) The air supply device may further include: an oxygen sensor for detecting an oxygen content rate in air in the specified room; and a control unit for controlling the blower based on a difference between a detection value of the oxygen sensor and a preset oxygen content.
In this configuration, the blower is controlled based on a difference between a detection value of the oxygen sensor and a set value. Therefore, the oxygen content of the air in the predetermined room can be made close to the set value. The oxygen ratio in the air in the collection container is adjusted by adjusting the amount of air blown by the blower into the collection container.
(8) In the air supply device, a check valve may be disposed in the blower pipe, the check valve allowing a flow of air from the blower and preventing a flow of air from the collection container to the blower.
In this configuration, the hypoxic air in the collective container can be prevented from leaking to the blower side. Therefore, the hypoxic air generated by the adjustment unit can be effectively utilized.
(9) In the air supply device, the supply pipe may be provided with a main pipe connected to the collection container and a plurality of branch pipes branching from the main pipe. In this case, the branch pipes may be connected to different locations at a partition portion constituting the designated room.
In this configuration, the low-oxygen air having the same oxygen content can be supplied from a plurality of locations constituting the partition of the predetermined room. Therefore, the occurrence of the variation in oxygen concentration in the room can be suppressed. Further, only a main pipe is connected to the collective container. Therefore, the air is sufficiently mixed in the collective container, and the air having the same oxygen content rate flows into the main pipe. This makes it possible to supply air having a more stable oxygen content than in the case where the collective container and the predetermined room are connected by a plurality of pipes.
(10) The adjusting portion may have a structure in which the oxygen permeability is changed by a pressure difference between a pressure applied to the pressurizing portion side of the adjusting portion and a pressure applied to the collective container side of the adjusting portion. In this case, a valve capable of changing the flow path area of the pipe may be disposed in the pipe connecting the adjusting portion and the collecting container.
In this configuration, the flow path resistance of the pipe can be changed by changing the flow path area of the pipe with the valve. Therefore, the pressure on the collection container side of the adjustment portion can be adjusted by changing the opening degree of the valve. This makes it possible to change the oxygen transmission rate of the adjustment part.
(11) In the air supply device, the adjusting portion may have a configuration in which the oxygen permeability is changed in accordance with a pressure difference between a pressure applied to the pressurizing portion side of the adjusting portion and a pressure applied to the collective container side of the adjusting portion. The connection portion connecting the adjustment portion and the collective container may include a plurality of pipes provided in parallel with each other, and a valve for opening and closing the pipes and a throttling portion for reducing a flow passage area in the pipes may be provided in each of the plurality of pipes. In this case, the flow path areas of the respective throttle portions are different from each other.
In this configuration, since the flow path resistances of the plurality of pipes are different, the flow path resistance of the connection portion can be changed depending on which valve is opened. Thus, the pressure on the collective container side of the adjustment portion can be adjusted depending on which valve is opened. Since the oxygen transmission rate can be changed depending on which valve is opened, the oxygen content rate can be easily changed.
(12) In the air supply device, the adjusting portion may generate high oxygen air having a higher oxygen content than the air in addition to the low oxygen air. In this case, the air supply device may further include a second collective tank into which the air that has not passed through the adjustment unit and the high-oxygen air generated by the adjustment unit are introduced.
In this configuration, the adjustment unit generates not only low-oxygen air but also high-oxygen air. The low-oxygen air generated by the adjustment unit is supplied to a predetermined room through the collective container, and the high-oxygen air generated by the adjustment unit is supplied to a room using the high-oxygen air through the second collective container. Therefore, air having a desired oxygen content can be supplied to each of the room using the low-oxygen air and the room using the high-oxygen air.
(13) In the air supply device, the adjusting part may have a membrane body having an oxygen transmittance higher than a nitrogen transmittance and allowing carbon dioxide to permeate therethrough. In this case, a mechanism for reducing the carbon dioxide content may be disposed in the pipe connecting the adjusting unit and the second collecting container.
In this configuration, the content of carbon dioxide can be suppressed in the pipe connecting the adjusting part and the second collecting container.
As described above, it is possible to make it difficult for the distribution of the oxygen content rate to vary in the room to which the hypoxic air is supplied.
Claims (14)
1. An air supply device for supplying air lower in oxygen than the atmosphere to a specified room, characterized by comprising:
an adjustment unit that adjusts the oxygen content of air and generates hypoxic air having a lower oxygen content than the air;
a collective container into which air that has not passed through the adjustment unit and the hypoxic air generated by the adjustment unit are introduced; and
a supply tube that delivers hypoxic air within the collection container to the designated room.
2. The air supply device according to claim 1, characterized by further comprising:
a blower, wherein,
the air that does not pass through the adjustment unit is blown out from the blower and introduced into the collection container through a blower pipe.
3. The air supply device according to claim 1,
the adjustment unit includes a film body having a property of differing oxygen permeability and nitrogen permeability.
4. The air supply device according to any one of claims 1 to 3, characterized by further comprising:
a pressurizing part for pressurizing air; and
and an introduction pipe that introduces the air pressurized by the pressurization unit into the adjustment unit.
5. The air supply device according to claim 4,
the air that does not pass through the adjusting portion is a part of the air pressurized by the pressurizing portion.
6. The air supply device according to claim 4,
the pressurizing part is provided with a compressor for compressing air,
the capacity of the compressor is set based on the flow rate of the air that is not sent to the collective container by the adjustment unit, the flow rate of the hypoxic air that flows out from the adjustment unit, and the ventilation volume of the specified room.
7. The air supply device according to claim 2, characterized by further comprising:
an oxygen sensor for detecting an oxygen content rate in air in the specified room; and
and a control unit for controlling the blower based on a difference between a detection value of the oxygen sensor and a preset oxygen content.
8. The air supply device according to claim 2,
the air supply duct is provided with a check valve that allows the flow of air from the air supply device and prevents the flow of air from the collection container to the air supply device.
9. The air supply device according to claim 1,
the supply pipe includes a main pipe connected to the collection container and a plurality of branch pipes branching from the main pipe,
the branch pipes are connected to different locations at partition sections constituting the designated room.
10. The air supply device according to claim 4,
the adjusting part is configured such that the oxygen permeability is changed according to a pressure difference between a pressure applied to the pressurizing part side of the adjusting part and a pressure applied to the collective container side of the adjusting part,
a valve capable of changing the flow path area of the piping is disposed in the piping connecting the adjusting part and the collective container.
11. The air supply device according to claim 4,
the adjusting part is configured such that the oxygen permeability is changed according to a pressure difference between a pressure applied to the pressurizing part side of the adjusting part and a pressure applied to the collective container side of the adjusting part,
the connection part connecting the adjustment part and the collection container is provided with a plurality of pipes arranged in parallel,
a valve for opening and closing the piping and a throttle portion for reducing the flow path area in the piping are disposed in each of the plurality of piping,
the flow path areas of the respective throttle portions are different from each other.
12. The air supply device according to claim 1, 2, 3, 7, 8 or 9,
the adjusting unit generates high oxygen air having a higher oxygen content than the air in addition to the low oxygen air,
the air supply device further includes a second collective container into which the air that has not passed through the adjustment unit and the high oxygen air generated by the adjustment unit are introduced.
13. The air supply device according to claim 4,
the adjusting unit generates high oxygen air having a higher oxygen content than the air in addition to the low oxygen air,
the air supply device further includes a second collective container into which the air that has not passed through the adjustment unit and the high oxygen air generated by the adjustment unit are introduced.
14. The air supply device according to claim 12,
the adjusting part is provided with a membrane body which has higher oxygen transmittance than nitrogen transmittance and allows carbon dioxide to permeate,
a mechanism for reducing the carbon dioxide content is disposed in the pipe connecting the adjusting unit and the second collecting container.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2019142787 | 2019-08-02 | ||
| JP2019-142787 | 2019-08-02 |
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| CN201922424451.9U Active CN211739350U (en) | 2019-08-02 | 2019-12-27 | Air supply device |
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