Air Supply System

Abstract

To provide an air supply system capable of supplying purified air into a room by removing dust in air passing through a filter, even if dust in outside air cannot be sufficiently removed by the filter.SOLUTION: An air supply system for supplying air obtained by removing dust from outside air to a room in a building, is equipped with an intake port for taking outdoor air into a room by natural intake, a filter that removes dust from the outside air taken from the intake port, an intake chamber that internally has a space in which air passing through the filter is taken, and a communication path that communicates the intake chamber and the room. The intake chamber is equipped with an exhaust portion connected to the communication path. The exhaust portion is located above the filter so as to prevent dust in the air passing through the filter from falling due to self-weight in the intake chamber and reaching the room.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an air supply system. [Background technology]

[0002] Conventionally, in an air supply system for supplying air to rooms in a building, there has been proposed an air supply system that includes a filter installed near an outside air intake for removing dust in the outside air, a blowing means installed near the filter, and a duct that sends air that has passed through the filter to the rooms in the building by the blowing means (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-195623 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the air supply system described in Patent Document 1 is a system that forcibly generates an airflow by a blowing means provided on the intake side and supplies the airflow to an indoor room through a duct. Therefore, if there is dust that has not been captured by the filter, the dust may ride on the airflow generated by the blowing means and be supplied to a room in the building. In particular, in an environment where there is a large amount of dust in the outside air, such as an area where a factory is located, there is a high possibility that dust will remain in the air that has passed through the filter, and therefore the dust is more likely to be supplied to a room in the building.

[0005] In view of the above problems, the present invention aims to provide an air supply system that can remove dust from air that passes through a filter and supply purified air indoors, even when the dust in the outside air cannot be sufficiently removed by the filter. [Means for solving the problem]

[0006] The air supply system of the present invention is an air supply system that supplies air from which dust has been removed from the outside air to rooms in a building, and is equipped with an intake port that takes in outdoor air indoors through natural ventilation, a filter that removes dust from the outside air taken in through the intake port, an intake chamber having an internal space into which air that has passed through the filter is taken in, and a communication passage that connects the intake chamber to the room, and the intake chamber is equipped with an exhaust section connected to the communication passage, and the exhaust section is located above the filter to prevent dust in the air that has passed through the filter from falling within the intake chamber due to its own weight and reaching the room.

[0007] It is preferable that the flow rate of the air passing through the intake port is set to 2.0 m / s or less.

[0008] It is preferable that the intake room is a room other than a living room in the building.

[0009] It is preferable that the intake chamber is a dust collection box connected to the room via the communication passage.

[0010] The communication passage preferably has an upwardly rising passage that rises upward from the exhaust portion. Effect of the Invention

[0011] According to the present invention, even if dust in the outside air cannot be sufficiently removed by a filter, the remaining dust can be removed with a simple configuration and purified air can be supplied indoors. [Brief description of the drawings]

[0012] [Figure 1] 1 is a diagram showing a schematic diagram of an example of the configuration of an air supply system according to an embodiment of the present invention; [Diagram 2] 2 is a diagram showing a schematic diagram of an example of a communication passage in the air supply system shown in FIG. 1. [Diagram 3]FIG. 2 is a diagram showing a schematic diagram of another example of the configuration of an air supply system according to an embodiment of the present invention. [Figure 4] 4 is a diagram showing an example of the configuration of a communication passage in the air supply system shown in FIG. 3; FIG. [Diagram 5] 4 is a diagram showing an example of the configuration of a dust collection box in the air supply system shown in FIG. 3. [Figure 6] 6 is a view of the dust collection box shown in FIG. 5 as seen from a direction A. [Figure 7] 6 is a view of the dust collection box shown in FIG. 5 as seen from a direction indicated by an arrow B. [Figure 8] FIG. 2 is a diagram showing a schematic diagram of another example of the configuration of an air supply system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an air supply system according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is merely an example, and the air supply system of the present invention is not limited to the embodiment described below.

[0014] In this specification, the terms "perpendicular to A" and similar expressions do not only refer to a direction completely perpendicular to A, but also refer to a direction that is approximately perpendicular to A. In this specification, the terms "parallel to B" and similar expressions do not only refer to a direction that is completely parallel to B, but also refer to a direction that is approximately parallel to B. In this specification, the terms "C-shape" and similar expressions do not only refer to a perfect C-shape, but also refer to a shape that visually resembles a C-shape (approximately a C-shape).

[0015] In this specification and the drawings, the direction H represents the horizontal direction, and the direction V represents the vertical direction. In this specification and the drawings, the "vertical direction" also includes a direction slightly tilted relative to the vertical direction. In this specification and the drawings, the "horizontal direction" also includes a direction slightly tilted relative to the horizontal direction.

[0016] Fig. 1 is a diagram showing a schematic diagram of an example of the configuration of an air supply system according to one embodiment of the present invention. Fig. 2 is a diagram showing a schematic diagram of an example of the configuration of an air supply system according to one embodiment of the present invention, and a diagram showing a schematic diagram of an example of a communication passage. Fig. 1 shows a case where the air supply system is applied to a three-story building. Fig. 1 is also a diagram showing the air supply system as viewed from a direction along a horizontal plane. Fig. 2 is a diagram showing a part of the air supply system (one floor of a building) as viewed from above.

[0017] The air supply system 1 according to this embodiment (see Figs. 1 and 2) is a system that supplies air from which dust has been removed from outside air to a room 3 in a building 2. In this embodiment, the air supply system 1 constitutes a ventilation system 100 that ventilates the room 3 in the building 2. The ventilation system 100 includes the air supply system 1 that supplies air to the room 3 to be ventilated, and an exhaust system 8 that exhausts the air in the room 3 to be ventilated to the outdoors.

[0018] In this embodiment, the building 2 is provided with an exhaust system 8 (see FIG. 2) that exhausts air inside the building 2 to the outdoors. The exhaust system 8 exhausts air from a room 3 inside the building 2 to the outdoors, thereby creating a negative air pressure inside the room 3. In this embodiment, the exhaust system 8 creates a negative air pressure inside the room 3, so that outside air is naturally drawn into an intake chamber 6, which will be described later, from an intake port 4 in the air supply system 1, which will be described later.

[0019] 2, the exhaust system 8 includes an exhaust port 81 and a blower 82. In this embodiment, the exhaust system 8 also includes an intake port 83 and a duct 84 (hereinafter also referred to as an exhaust-side duct 84).

[0020] The exhaust outlet 81 is an opening that exhausts the air in the room 3 to be ventilated, specifically the living room 31, to the outdoors. In this embodiment, the exhaust outlet 81 is provided in an opening formed in the exterior wall 21 of the building 2. Specifically, the exhaust outlet 81 is, for example, a louver provided in an opening formed in the exterior wall 21.

[0021] The blower 82 is a device that forcibly exhausts the air in the room 3 to be ventilated, specifically the living room 31, to the outside through the exhaust port 81. In this embodiment, the blower 82 is, for example, a blower. When the blower 82 exhausts the air in the room 3 to the outside, the air pressure in the room 3 becomes negative.

[0022] The air inlet 83 is an opening that draws in air from the room 3 to be ventilated, specifically, the living room 31. In this embodiment, the air inlet 83 is provided in a ceiling board (not shown) that divides the room 3.

[0023] The exhaust duct 84 is a pipe that sends the air sucked through the intake port 83 to the exhaust port 81 and the blower 82. In this embodiment, the exhaust duct 84 is provided in the space above the ceiling of the room 3.

[0024] The air supply system 1 in this specification is a system capable of supplying clean air into a building with living rooms, such as an office or a residence, in an environment where there is a lot of dust in the outside air, such as an area where a factory is located.

[0025] The type of building 2 to which the air supply system 1 is applied may be either a one-story building or a two-story or higher building. In addition, the type of building 2 to which the air supply system 1 is applied may be, for example, a residence, a store, an apartment building, a school building, a factory, an office, or the like, in terms of its purpose, and is not particularly limited.

[0026] The dust in this specification is not particularly limited, and includes, for example, dust dispersed during extraction of ore from a mine or processing of ore (mineral dust), dust dispersed during metal cutting, grinding, welding, etc. (metal dust), dust dispersed during fur processing or wood processing (animal and vegetable dust), etc.

[0027] In this specification, the room 3 to be ventilated is a space section separated by walls, partitions, ceiling boards, floor boards, etc. inside the building 2, and specifically, is a living room 31. The living room 31 refers to a room that is continuously used for living, working, working, meeting, entertainment, and other similar purposes. In detail, the living room 31 is, for example, a living room, dining room, bedroom, study, reception room, office, conference room, workshop, etc. In the example shown in FIG. 2 and FIG. 4, one living room 31 is provided on each floor, but this is not limited thereto, and a plurality of living rooms 31 may be provided on each floor. Note that the room 3 in this specification may or may not include a non-living room 32. The non-living room 32 is a room other than the living room 31. The non-living room 32 is, for example, a staircase, a storeroom, a warehouse, a garage, etc. In the example shown in FIG. 1 to FIG. 4, the non-living room 32 is a staircase. 1, 3, and 8, non-occupied rooms 32 are open to all floors. When non-occupied rooms 32 are used as intake rooms 6 described below, non-occupied rooms 32 are not included in rooms 3 to be ventilated.

[0028] As shown in FIG. 1, the air intake system 1 includes an intake port 4, a filter 5, an intake chamber 6, and a communication passage 7.

[0029] The intake 4 is an air vent that takes in outdoor air indoors by natural ventilation. In this embodiment, the intake 4 is provided in an opening formed in the exterior wall 21 of the building 2. Specifically, for example, the intake 4 is a louver provided in an opening formed in the exterior wall 21. In the above-mentioned Patent Document 1, a blower is provided near the intake port that takes in outdoor air, but in this embodiment, no blower is provided near the intake 4. In this embodiment, outdoor air is naturally supplied from the intake 4 to the indoors. In this embodiment, the air flow area (opening area) of the intake 4 is, for example, 0.25 to 0.4 m. 2 Conventionally, the air flow area of ​​a vent that naturally draws outdoor air indoors is generally in the range of 0.09 to 0.18 m. 2 That is, the air flow area at the inlet 4 of this embodiment is significantly larger than the air flow area at a typical conventional inlet.

[0030] Filter 5 removes dust from the outside air taken in through inlet 4. Filter 5 in this embodiment preferably removes most of the dust in the outside air taken in through inlet 4, but it does not matter if it cannot sufficiently remove dust in the outside air taken in through inlet 4. There are no particular limitations on the type of filter 5 as long as it can remove dust.

[0031] The intake chamber 6 has an internal space S (see Figs. 5 and 6) into which air that has passed through the filter 5 is taken in. In this embodiment, the intake chamber 6 has a portion 61 corresponding to the first floor (hereinafter also referred to as the first floor portion 61), a portion 62 corresponding to the second floor (hereinafter also referred to as the second floor portion 62), and a portion 63 corresponding to the third floor (hereinafter also referred to as the third floor portion 63). In this embodiment, the first floor portion 61, the second floor portion 62, and the third floor portion 63 are in communication with each other.

[0032] In the example shown in Fig. 1, the intake room 6 is a room other than a living room (the above-mentioned non-living room 32) in the building 2. Therefore, in the example shown in Fig. 1, the non-living room 32 which is the intake room 6 has a portion 321 corresponding to the first floor (hereinafter also referred to as the first floor portion 321), a portion 322 corresponding to the second floor (hereinafter also referred to as the second floor portion 322), and a portion 323 corresponding to the third floor (hereinafter also referred to as the third floor portion 323). The non-living room 32 and the living room 31 are separated by a wall, a partition, or the like. In the example shown in Fig. 1, the intake room 6 is a stairwell.

[0033] The intake chamber 6 is provided with an exhaust section 64 connected to a communication passage 7 described later. In the example shown in FIG. 1, the exhaust section 64 is an opening connected to the communication passage 7. Specifically, the exhaust section 64 is, for example, an opening on the non-occupied room 32 side in a through hole penetrating an inner wall 22 (see FIG. 2) that separates the non-occupied room 32 from the occupied room 31. This through hole is a part of the communication passage 7. As shown in FIG. 1, the exhaust section 64 is located above the filter 5 in order to prevent dust in the air that has passed through the filter 5 from falling in the intake chamber 6 due to its own weight and reaching the room 3. That is, in this embodiment, a configuration is adopted in which outdoor air is taken into the intake chamber 6 by natural air intake when the exhaust section 64 of the intake chamber 6 is located above the filter 5.

[0034] In this configuration, air is taken into the intake chamber 6 while the flow rate of the air flowing through the intake port 4 is suppressed, and the air is raised in the intake chamber 6 while the flow rate of the taken-in air is suppressed, and is exhausted from the exhaust section 64 to the communication passage 7. This allows the air taken into the intake chamber 6 to remain in the intake chamber 6 for a certain period of time, and the dust in the air that remains can be made to fall (free fall) into the intake chamber 6 by its own weight. Therefore, even if the dust in the outside air cannot be sufficiently removed by the filter 5, the remaining dust can be removed with a simple configuration, and purified air can be supplied to the room 3 inside the house.

[0035] In this embodiment, the air supply system 1 is designed so that the flow rate of the air passing through the inlet 4 is 2.0 m / s or less. The air flow rate may temporarily become 0 m / s. The configuration of the air supply system 1 for setting the flow rate of the air passing through the inlet 4 in such a range is not particularly limited, but for example, as described above, the air flow area at the inlet 4 may be set to 0.25 to 0.4 m. 2Various parameters may be set so that the range is within the above range and the amount of air supplied from the intake port 4 and the amount of air exhausted from all the exhaust systems 8 (amount of air exhausted to the outdoors) are approximately the same. The various parameters are, for example, the air flow area at the exhaust port 81, the air volume of the blower 82, the inner diameter of the communication passage 7, and the inner diameter of the exhaust duct 84. These may be appropriately changed depending on the structure and size of the building 2. In this embodiment, the building 2 is provided with only one intake chamber 6. In this case, the maintenance work for the air supply system 1 can be performed simply by cleaning the filter 5 and cleaning the dust that has fallen into one intake chamber 6, so that the air supply system 1 has excellent dust removal performance and maintainability.

[0036] In this embodiment, as long as it is possible to prevent the dust in the air that has passed through the filter 5 from falling into the intake chamber 6 due to its own weight and reaching the room 3, the height difference between the exhaust section 64 and the filter 5 is not particularly limited. Also, as long as such prevention can be performed, the distance between the exhaust section 64 and the filter 5 is not particularly limited. Also, as long as such prevention can be performed, the shape and size of the intake chamber 6 are not particularly limited.

[0037] The communication passage 7 (see FIG. 2) is a passage that communicates the intake chamber 6 and the room 3. The form of the communication passage 7 is not particularly limited as long as it can communicate the intake chamber 6 and the room 3. In the example shown in FIG. 1 and FIG. 2, the communication passage 7 is a duct (hereinafter, also referred to as an air supply side duct). The air supply side duct includes a through hole that penetrates the inner wall 22 that divides the intake chamber 6 and the room 3. In the example shown in FIG. 1 and FIG. 2, the communication passage 7 is a pipe that sends air sent from the exhaust part 64 of the intake chamber 6 into the room 3 (the living room 31 in the example shown in FIG. 2). In the example shown in FIG. 2, the communication passage 7 is provided in the space above the ceiling of the room 3. Also, in the example shown in FIG. 2, an air supply port 71 that opens into the room 3 is provided at the tip end (the downstream end of the air flow) of the communication passage 7. The air supply port 71 is an opening that supplies air into the room 3, which is the target of ventilation, specifically, into the living room 31. In this embodiment, the air intake port 71 is provided in a ceiling board (not shown) that divides the room 3. The air sent from the exhaust section 64 of the intake chamber 6 to the communication passage 7 passes through the communication passage 7 and is supplied into the room 3 from the air intake port 71. In this embodiment, as shown in FIG. 2, the communication passage 7 branches into a plurality of branch passages 72 from the upstream side to the downstream side of the air flow. The plurality of air intake ports 71 and the plurality of branch passages 72 may be provided for one room 3, or may be provided by being assigned to a plurality of rooms 3. In both cases where the plurality of air intake ports 71 and the plurality of branch passages 72 are provided for one room 3 and where they are provided by being assigned to a plurality of rooms 3, an exhaust system 8 is provided in each room 3 to exhaust the air supplied from the air intake port 71 from the room 3.

[0038] In the above embodiment, the case where the intake chamber 6 is a non-occupied room 32 in the building 2 has been described, but the present invention is not limited to this. For example, the intake chamber 6 may be a dust collection box installed in the building 2. Hereinafter, the case where the intake chamber 6 is a dust collection box installed in the building 2 will be described with reference to Figs. 3 to 7.

[0039] Fig. 3 is a diagram showing another example of the configuration of an air supply system according to one embodiment of the present invention, and Fig. 4 is a diagram showing an example of the configuration of a communication passage in the air supply system shown in Fig. 3.

[0040] In the example shown in FIG. 3 and FIG. 4, the intake room 6 is a dust collection box installed in the building 2. In detail, the intake room 6 is a dust collection box connected to the room 3 via a communication passage 7. The intake room 6, which is a dust collection box, is installed in a non-habitable room 32. In this embodiment, the non-habitable room 32 is a staircase. That is, in the example shown in FIG. 3 and FIG. 4, the structure of the building 2 itself is not taken as the intake room 6 as shown in FIG. 1 and FIG. 2, but the dust collection box arranged in the structure of the building 2 is taken as the intake room 6. In the example shown in FIG. 3, one intake room 6 is arranged inside the first floor part 61 of the building 2. Note that the number of intake rooms 6 as a dust collection box is not limited to one, and multiple intake rooms 6 may be provided as shown in FIG. 8. When multiple intake rooms 6 are provided, one intake room 6 may be provided on each floor.

[0041] In the example shown in FIG. 3, the communication passage 7 has a rising passage 73 rising upward from the exhaust section 64. As long as the intake chamber 6 can exhibit a dust collecting function, the rising passage 73 may be arranged to rise upward from the exhaust section 64 along the vertical direction V as shown in FIG. 3, or may be arranged to rise obliquely upward from the exhaust section 64. In this embodiment, the air supply system 1 is designed so that the flow velocity of the air passing through the exhaust section 64 is, for example, 2.0 to 4.0 m / s. In this case, the flow velocity of the air flow taken into the intake chamber 6 is suppressed to a predetermined range, and the air is retained in the intake chamber 6 for a certain period of time, and the dust in the air can be allowed to fall (free fall) into the intake chamber 6 by its own weight due to the retention.

[0042] The intake chamber 6, which is a dust collection box, will be described below with reference to Figs.

[0043] Fig. 5 is a diagram showing a schematic example of the configuration of a dust collection box in the air supply system shown in Fig. 3. Fig. 6 is a diagram showing the dust collection box shown in Fig. 5 as viewed from the direction A. Fig. 7 is a diagram showing the dust collection box shown in Fig. 5 as viewed from the direction B. In Fig. 5, an example of the flow of air FL entering the dust collection box is shown by a two-dot chain line. Fig. 6 is a plan view of the dust collection box.

[0044] As shown in Figs. 5 to 7, the intake chamber 6, which is a dust collection box, is formed in a substantially rectangular parallelepiped shape. The intake chamber 6 is formed, for example, by processing a metal plate. In the example shown in Figs. 5 to 7, the intake chamber 6 includes a substantially rectangular parallelepiped main body 65, an upstream connection part 66 connected to the outside air intake 4, and a downstream connection part 67 to which the communication passage 7 is connected. The main body 65 includes an upper surface part 65A in which an opening is formed in which the downstream connection part 67 is provided, a lower surface part 65B, a front part 65C located on the opposite side to the intake 4, a back part 65D located on the intake 4 side and in which an opening is formed in which the upstream connection part 66 is provided, and a left side part 65E and a right side part 65F provided to connect the front part 65C and the back part 65D. Inside the main body 65, a substantially rectangular parallelepiped space S is formed. The intake chamber 6 is configured to allow the dust to fall freely in the space S to be removed. In addition, a filter 5 is provided upstream of the space S in the main body 65. As long as the dust can be removed by allowing the dust to fall freely in the space S, the shape and size of the main body 65 are not particularly limited. In this embodiment, the width W1 of the main body 65 is 800 mm, the height H1 is 700 mm, and the depth D1 is about 700 mm. In addition, in order to prevent fine dust that has passed through the filter 5 from reaching the inside of the communication passage 7, it is preferable that the length in the depth D1 direction of the filter 5 and the inner surface of the dust collection box (the inner surfaces of the left side surface portion 65E and the right side surface portion 65F) is, for example, 500 mm or more. In addition, as long as the dust collection box is not in the way, the upper limit of the length in the depth D1 direction of the dust collection box is not particularly limited, but in order to prevent the dust collection box from protruding too much from the wall surface of the installation target, it is preferable that the length in the depth D1 direction of the filter and the inner surface of the dust collection box is, for example, 500 mm to 1000 mm.

[0045] 5 and 6 is configured so that the filter 5 can be inserted and removed in a direction along the surface of the filter 5. By inserting and removing the filter 5, maintenance work on the filter 5 can be performed. Specifically, for example, the filter 5 that has been removed can be washed to remove dust, and the washed filter 5 can be attached to its original position, whereby maintenance work on the filter 5 can be easily performed.

[0046] The intake chamber 6 shown in FIG. 7 is provided with an inspection hatch (not shown) and a lid 68 provided on the main body 65 to open and close the inspection hatch. The inspection hatch is, for example, an opening for inspecting the inside of the main body 65 and, if necessary, inserting a cleaning tool to perform cleaning work. The position and size of the inspection hatch are not particularly limited as long as the worker can perform the inspection work and cleaning work. In the example shown in FIG. 7, the inspection hatch is provided on the front part 65C of the main body 65. The worker can inspect the inside of the intake chamber 6 through the inspection hatch by opening the lid 68. In addition, if the worker determines that dust has accumulated inside the main body 65, he or she can insert a cleaning tool through the inspection hatch to clean the inside of the main body 65 and close the lid 68 when cleaning is completed. As shown in FIG. 3, in a building 2 having multiple rooms 3 or multiple floors, when only one dust collection box (intake chamber 6) is provided, maintenance of the air supply system 1 is completed by cleaning only one dust collection box. Therefore, in this embodiment, maintenance can be completed by simply cleaning a limited space with a limited number of cleaning tools, which further improves maintainability. In addition, if the height of the inspection hatch is set to a height that makes it easy for workers to perform inspection and cleaning work, maintainability can be further improved. Such a height is not particularly limited, but is, for example, about the height of the waist of a worker in a standing position.

[0047] In this embodiment, the exhaust system 8 puts the room 3 into a negative pressure state, and the air in the communication passage 7 and the dust collection box is drawn toward the room 3. This introduces outside air into the dust collection box. The filter 5 removes coarse dust from the air introduced into the dust collection box. The air containing fine dust that has passed through the filter 5 is taken into the dust collection box by natural air intake, so unlike the airflow forcibly generated by the blowing means, the flow rate is slow, and the dust contained in this air falls by its own weight in the dust collection box before reaching the communication passage 7. In this embodiment, the communication passage 7 extends above the dust collection box, making it more difficult for the dust to reach the communication passage 7. As a result, even if the dust in the outside air cannot be sufficiently removed by the filter 5, the remaining dust can be removed with a simple configuration and purified air can be supplied to the indoor room 3. [Explanation of symbols]

[0048] 1. Air Supply System 2. Building 21 Exterior Wall 22 Inner wall 3 rooms 31 Room 32 Non-occupied room 321 1st floor part 322 2nd floor part 323 3rd floor part 4 Intake port 5. Filters 6. Intake Room 61 1st floor part 62 2nd floor part 63 3rd floor part 64 Exhaust section 65 Main Unit 65A Top part 65B Bottom part 65C front part 65D back part 65E Left side 65F Right side section 66 Upstream Connection 67 Downstream Connection 68 Lid 7 Communication path 71 Air supply port 72 Branch Passage 73 Rising Passage 8 Exhaust System 81 Outlet 82 Blower 83 Intake port 84 Exhaust duct 100 Ventilation System FL Air flow H horizontal direction S space V vertical direction

Claims

1. 1. An air supply system for supplying dust-free air from outside to a room in a building, comprising: An intake port that naturally draws outdoor air into the room; a filter for removing dust from the outside air taken in through the intake port; an intake chamber having a space therein into which air that has passed through the filter is taken in; a communication passage that communicates the intake chamber with the room, The intake chamber includes an exhaust section connected to the communication passage, In order to prevent dust in the air that has passed through the filter from falling in the intake chamber due to its own weight and reaching the room, the exhaust section is located above the filter, The intake chamber is a dust collection box connected to the room via the communication passage, The communication passage has an upwardly rising passage that rises upward from the exhaust section.

2. The air supply system of claim 1 , wherein the air flow velocity passing through the intake is 2.0 m / s or less.

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