air blower

Abstract

To provide an air blower which can suppress the disturbance of a planar airflow due to a backflow airflow in a closed dwelling room space.SOLUTION: An air blower 1 comprises: a dwelling room space 26 having a floor face (floor board 12), a wall face (side panel 14) erecting from the floor face, and a ceiling face (top board 16) opposing the floor face; a plurality of nozzles 60 arranged with spaces between the ceiling face and themselves, and blowing out an airflow toward the floor face; an induction air duct 70 for making an induction airflow AF2 circulate therein; and a backflow air duct 80 for making a backflow airflow AF3 circulate therein. The induction air duct 70 is arranged between the adjacent nozzles 60, and the backflow air duct 80 is arranged between the wall face and the nozzles 60. In the air blower 1, a distance between the wall face forming the backflow air duct 80 and the nozzles 60 is elongated compared with a distance between the adjacent nozzles 60 forming the induction air duct 70.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a blower device. [Background technology]

[0002] Patent Document 1 discloses a blower that generates a highly linear airflow along the blowing direction (hereinafter, this may be referred to as a "surface wind" or "surface airflow"). This blower 901 will be described with reference to FIG. 4. FIG. 4(a) is a perspective view showing the configuration of the blower 901. FIG. 4(b) is a cross-sectional view of side A in FIG. 4(a). This blower 901 includes, in a housing 910, an intake port 920 for taking in air, a high-pressure air generator 930 composed of an impeller for generating high-pressure air and a motor for driving the impeller, and a plurality of nozzles 940 erected from one side of the housing 910. The nozzle 940 has, on its side, an outlet 941 for blowing out the high-pressure air generated by the high-pressure air generator 930 in a direction perpendicular to the direction in which the nozzle 940 is erected, and a duct 942 for guiding the high-pressure air to the outlet 941. Nozzles 940 have a vertical cross section that is elongated in the blowing direction, and are provided with gaps so that each of the multiple air outlets 941 is on the same plane, and these gaps form induced airflow paths 950 for air (induced air AF902) that is drawn by air AF901 blown out from air outlets 941. Blower device 901 generates blown airflow AF903, which is a highly rectilinear airflow that flows along the blowing direction, using air AF901 blown out from the multiple nozzles 940 and induced air AF902 flowing through induced airflow path 950. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-115629 Summary of the Invention [Problem to be solved by the invention]

[0004] Consider the case where a conventional blower is installed in a closed, living space such as a booth to generate a surface airflow from the ceiling toward the floor. In the limited space of a booth, if the return airflow duct for guiding the return airflow into the induction airflow duct to generate the induction airflow is not sufficiently secured, air may flow into the induction airflow duct from an unintended location. In this case, air will not be stably drawn into the induction airflow duct, and one of the conditions for a surface airflow, "highly linear airflow along the blowing direction," will be lost. In other words, the technology described in Patent Document 1 has room for improvement in terms of the fact that the flow of the surface airflow is disturbed by the return airflow when generating a surface airflow in a closed, living space such as a booth.

[0005] An object of the present disclosure is to provide a blower device that can prevent a surface airflow (a highly linear airflow along the blowing direction) from being disturbed by a return airflow in a closed living space. [Means for solving the problem]

[0006] The air blower device according to the present disclosure includes a living space having a floor, a wall extending from the floor, and a ceiling facing the floor; a plurality of nozzles arranged with a space between them and the ceiling, each blowing an airflow toward the floor; an induction airflow duct through which an induction airflow is drawn from the space toward the floor by the airflow blown out from the plurality of nozzles; and a return airflow duct through which a return airflow is drawn from the floor toward the ceiling and flows into the space. The induction airflow duct is provided between adjacent nozzles. The return airflow duct is provided between the wall and the nozzle. The distance between the wall and the nozzle that forms the return airflow duct is greater than the distance between adjacent nozzles that form the induction airflow duct. [Effects of the Invention]

[0007] The air blower device according to the present disclosure can prevent the flow of surface airflow (highly linear airflow along the blowing direction) in a closed living space from being disturbed by a return airflow. [Brief explanation of the drawings]

[0008] [Figure 1]FIG. 1 is a perspective view showing the configuration of the blower device according to the first embodiment. [Figure 2] FIG. 2 is a side view schematically showing the flow of air generated by the blower device in the first embodiment. [Figure 3] FIG. 3 is a front view schematically showing the flow of air generated by the blower device in the first embodiment. [Figure 4] FIG. 4 is a diagram showing the configuration of a conventional blower. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, unnecessary detailed description may be omitted. For example, detailed description of well-known matters or redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

[0010] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to Figs. 1 to 3. Fig. 1 is a perspective view showing a blower 1 in the first embodiment. More specifically, Fig. 1(a) is a perspective view showing the structure of the blower 1, and Fig. 1(b) is a see-through perspective view showing the internal structure of the blower 1. Fig. 2 is a side view showing the flow of airflow generated by the blower 1. Fig. 3 is a front view showing the flow of airflow generated by the blower 1. Note that Fig. 2 shows the flow of airflow without distinguishing between the first nozzle 61, the second nozzle 62, the third nozzle 63, and the fourth nozzle 64.

[0012] [1-1.Configuration] The air blower 1 is an equipment unit having a space (living space 26) large enough for at least one person to stay in, and having a nozzle 60 arranged on the ceiling side thereof for blowing air into the living space 26. The air blower 1 has a private room (living space 26) for one person equipped with a desk 200, chair 300, etc. for remote work or study, and can also be called a private booth.

[0013] The air blower 1 includes a floorboard 12, a side panel 14, a top board 16, an inner panel 18, a door 20, an air intake 22, an air exhaust 24, a living space 26, a hollow space 28, a chamber 30, a duct 40, a blower 50, a nozzle 60, an induction air duct 70, and a return air duct 80.

[0014] The floor board 12 is a rectangular board member arranged on the floor side of the air blower 1.

[0015] The side panels 14 are composed of four rectangular boards: a first side panel 14a, a second side panel 14b, a third side panel 14c, and a fourth side panel 14d, and are erected vertically upward from the four outer edges of the floorboard 12.

[0016] The first side panel 14a is the side panel 14 provided with the door 20, and is adjacent to one side end of the third side panel 14c and one side end of the fourth side panel 14d.

[0017] The second side panel 14b is a side panel 14 that is disposed in a position opposite to the first side panel 14a, and is adjacent to the other side end of the third side panel 14c and the other side end of the fourth side panel 14d.

[0018] The third side panel 14c is a side panel 14 provided with an air supply port 22, and is adjacent to one side end of the first side panel 14a and one side end of the second side panel 14b.

[0019] The fourth side panel 14d is a side panel 14 that is disposed opposite the third side panel 14c and has an exhaust port 24, and is adjacent to the other end of the first side panel 14a and the other end of the second side panel 14b.

[0020] The top board 16 is a rectangular board that covers the opening formed by the upright placement of the side panels 14. The top board 16 is provided above the floor board 12, and corresponds to the ceiling surface of the air blower 1 when the floor board 12 is the floor surface of the air blower 1.

[0021] The inner panel 18 is a rectangular plate member that divides the space formed by the floor board 12, the side panel 14, and the top board 16 into a living space 26 where the user of the air blower 1 stays, and a hollow space 28. The inner panel 18 is provided on the floor board 12, positioned closer to the third side panel 14c than the door 20.

[0022] The living space 26 is a space where a user of the air blower 1 can enter, exit, and stay. The living space 26 is formed by a floorboard 12, side panels 14 (first side panel 14a, second side panel 14b, and fourth side panel 14d), a top board 16, and an inner panel 18. In the living space 26, a desk 200 and a chair 300 are arranged in predetermined positions, as shown in FIG. 1(b).

[0023] The door 20 is used by users staying in the living space 26 when entering and leaving the space. The door 20 is provided on the first side panel 14a.

[0024] The desk 200 is a piece of furniture on which a user staying in the living space 26 can place a computer, documents, etc. and work. The desk 200 is provided in contact with the fourth side panel 14d.

[0025] The chair 300 is a piece of furniture for a user staying in the living space 26 to sit on. The chair 300 is provided in contact with the inner panel 18.

[0026] The hollow space 28 is formed by the floorboard 12, the side panels 14 (first side panel 14a, second side panel 14b, and third side panel 14c), the top board 16, and the inner panel 18, and is in communication with the living space 26. The hollow space 28 contains the chamber 30, the duct 40, and the blower 50.

[0027] Air intake port 22 is a square opening for supplying air from the space on the outer periphery of blower device 1 to living space 26, and is provided in third side panel 14c below the center in the height direction of living space 26. Air intake port 22 draws air from the space on the outer periphery of blower device 1 when blower 50 is operating.

[0028] Exhaust port 24 is a square opening for discharging air from living space 26 to the space on the outer periphery of blower 1, and is provided in fourth side panel 14d below the center in the height direction of living space 26. Exhaust port 24 discharges air from living space 26 when blower 50 is operating.

[0029] The nozzle 60 is a rectangular ventilation pipe into which air delivered by the blower 50 flows. The nozzle 60 is installed at a predetermined position on the top board 16 side of the living space 26, and blows out air (airflow AF1) that flows from the top board 16 side toward the floor board 12 side. As shown in FIGS. 2 and 3, the nozzle 60 is positioned offset from the top board 16. In other words, a predetermined space is formed between the nozzle 60 and the top board 16.

[0030] 2, the nozzle 60 starts above the inner panel 18 and extends horizontally toward the fourth side panel 14d. The nozzle 60 is connected to the chamber 30 on the side starting from the inner panel 18. "Above the inner panel 18" means a position higher than the head of a standing person, and more specifically, refers to a position at least 200 cm above the floorboard 12 in the living space 26. "Extending horizontally" means standing in a direction approximately parallel to the floorboard 12, which forms the floor surface, and the top board 16, which forms the ceiling surface in the living space 26.

[0031] In the first embodiment, the nozzles 60 include a first nozzle 61, a second nozzle 62, a third nozzle 63, and a fourth nozzle 64, a total of four nozzles, which are arranged in parallel from the first side panel 14a toward the second side panel 14b.

[0032] The first nozzle 61 has a nozzle lower surface 61a, a nozzle side surface 61b, and a nozzle side surface 61c, and is disposed at a position of the nozzles 60 closest to the first side panel 14a.

[0033] The nozzle lower surface 61a is a rectangular flat plate formed by short sides and long sides, and is disposed opposite the floorboard 12. The nozzle lower surface 61a has an air outlet 61d.

[0034] The air outlet 61d is a rectangular opening having short and long sides, and blows out the air conveyed to the first nozzle 61 as an airflow AF1a. The short sides of the air outlet 61d and the short sides of the nozzle lower surface 61a are arranged substantially parallel to each other. The long sides of the air outlet 61d and the long sides of the nozzle lower surface 61a are arranged substantially parallel to each other.

[0035] The nozzle side surface 61b and the nozzle side surface 61c are rectangular flat plates extending from the long sides of the nozzle lower surface 61a toward the top board 16. The nozzle side surface 61b is provided opposite the first side panel 14a. The nozzle side surface 61c is provided opposite the second nozzle 62.

[0036] The second nozzle 62 has a nozzle lower surface 62 a, a nozzle side surface 62 b, and a nozzle side surface 62 c, and is disposed between the first nozzle 61 and the third nozzle 63 .

[0037] The nozzle lower surface 62a is a rectangular flat plate formed by short sides and long sides, and is disposed opposite the floorboard 12. The nozzle lower surface 62a has an air outlet 62d.

[0038] The air outlet 62d is a rectangular opening having short and long sides, and blows out the air conveyed to the second nozzle 62 as an airflow AF1b. The short sides of the air outlet 62d and the short sides of the nozzle lower surface 62a are arranged substantially parallel to each other. The long sides of the air outlet 62d and the long sides of the nozzle lower surface 62a are arranged substantially parallel to each other.

[0039] The nozzle side surface 62b and the nozzle side surface 62c are rectangular flat plates extending from the long sides of the nozzle lower surface 62a toward the top board 16. The nozzle side surface 62b is provided opposite the first nozzle 61. The nozzle side surface 62c is provided opposite the third nozzle 63.

[0040] The third nozzle 63 has a nozzle lower surface 63 a, a nozzle side surface 63 b, and a nozzle side surface 63 c, and is disposed between the second nozzle 62 and the fourth nozzle 64 .

[0041] The nozzle lower surface 63a is a rectangular flat plate formed by short sides and long sides, and is disposed opposite the floorboard 12. The nozzle lower surface 63a has an air outlet 63d.

[0042] The air outlet 63d is a rectangular opening having short and long sides, and blows out the air conveyed to the third nozzle 63 as an airflow AF1c. The short sides of the air outlet 63d and the short sides of the nozzle lower surface 63a are arranged substantially parallel to each other. The long sides of the air outlet 63d and the long sides of the nozzle lower surface 63a are arranged substantially parallel to each other.

[0043] The nozzle side surface 63b and the nozzle side surface 63c are rectangular flat plates extending from the long sides of the nozzle lower surface 63a toward the top board 16. The nozzle side surface 63b is provided opposite the second nozzle 62. The nozzle side surface 63c is provided opposite the fourth nozzle 64.

[0044] The fourth nozzle 64 has a nozzle lower surface 64a, a nozzle side surface 64b, and a nozzle side surface 64c, and is disposed at a position of the nozzles 60 closest to the second side panel 14b.

[0045] The nozzle lower surface 64a is a rectangular flat plate formed by short sides and long sides, and is disposed opposite the floorboard 12. The nozzle lower surface 64a has an air outlet 64d.

[0046] The air outlet 64d is a rectangular opening having short and long sides, and blows out the air conveyed to the fourth nozzle 64 as an airflow AF1d. The short sides of the air outlet 64d and the short sides of the nozzle lower surface 64a are arranged substantially parallel to each other. The long sides of the air outlet 64d and the long sides of the nozzle lower surface 64a are arranged substantially parallel to each other.

[0047] The nozzle side surface 64b and the nozzle side surface 64c are rectangular flat plates extending from the long sides of the nozzle lower surface 64a toward the top board 16. The nozzle side surface 64b is provided opposite the third nozzle 63. The nozzle side surface 64c is provided opposite the second side panel 14b.

[0048] Air outlets 61d, 62d, 63d, and 64d are arranged on the same horizontal plane. That is, in living space 26, air outlets 61d, 62d, 63d, and 64d are arranged at the same height from floorboard 12.

[0049] The induced airflow passages 70 are attracted by the airflow AF1 (airflow AF1a, airflow AF1b, airflow AF1c, and airflow AF1d) blown out from the nozzles 60 (first nozzle 61, second nozzle 62, third nozzle 63, and fourth nozzle 64), and circulate an induced airflow AF2 that flows from the space between the nozzles 60 and the top board 16 toward the floor board 12. In the first embodiment, the induced airflow passages 70 include three induced airflow passages 71, 72, and 73, which are provided between adjacent nozzles 60. More specifically, the induced airflow passages 71, 72, and 73 are provided between the nozzles 60 arranged in parallel along the short-side direction of the nozzle undersurfaces 61a, 62a, 63a, and 64a.

[0050] The induced airflow path 71 is attracted by the airflow AF1a blown out from the first nozzle 61 and the airflow AF1b blown out from the second nozzle 62, and circulates an induced airflow AF2a that flows from the space between the nozzle 60 and the top board 16 toward the floor board 12. The induced airflow path 71 is provided between the nozzle side surface 61c and the nozzle side surface 62b. The distance (spacing) between the nozzle side surface 61c and the nozzle side surface 62b is d1 = 145 mm.

[0051] The induced airflow path 72 is attracted by the airflow AF1b blown out from the second nozzle 62 and the airflow AF1c blown out from the third nozzle 63, and circulates an induced airflow AF2b that flows from the space between the nozzle 60 and the top board 16 toward the floor board 12. The induced airflow path 72 is provided between the nozzle side surface 62c and the nozzle side surface 63b. The distance (spacing) between the nozzle side surface 62c and the nozzle side surface 63b is d2 = 100 mm.

[0052] The induced airflow passage 73 is attracted by the airflow AF1c blown out from the third nozzle 63 and the airflow AF1d blown out from the fourth nozzle 64, and circulates an induced airflow AF2c that flows from the space between the nozzle 60 and the top board 16 toward the floor board 12. The induced airflow passage 73 is provided between the nozzle side surface 63c and the nozzle side surface 64b. The distance (spacing) between the nozzle side surface 63c and the nozzle side surface 64b is d1 = 145 mm.

[0053] The return airflow duct 80 circulates the return airflow AF3 that flows from the floorboard 12 toward the top board 16 and into the space between the nozzle 60 and the top board 16. In the first embodiment, the return airflow duct 80 includes a return airflow duct 81 and a return airflow duct 82, each of which is provided between the side panel 14 and the nozzle 60.

[0054] The return airflow passage 81 allows the return airflow AF3a, which is adjacent to the airflow AF1a, to flow through. The return airflow passage 81 is provided between the nozzle side surface 61b and the first side panel 14a. The distance (gap) between the nozzle side surface 61b and the first side panel 14a is D=390 mm.

[0055] The return airflow passage 82 allows the return airflow AF3b, which is adjacent to the airflow AF1d, to flow through. The return airflow passage 82 is provided between the nozzle side surface 64c and the second side panel 14b. The distance (gap) between the nozzle side surface 64c and the second side panel 14b is D=390 mm.

[0056] The relationship between distance D, distance d1, and distance d2 is D>d1>d2. Furthermore, distance d3 between nozzle side surface 61b and nozzle side surface 64c is set to be 2 / 3 or less of distance d4 between first side panel 14a and second side panel 14b.

[0057] The chamber 30 is a housing that connects the nozzle 60 and the duct 40 in communication with each other. The chamber 30 controls the flow of air (airflow direction) toward the nozzle 60. The nozzle 60 is connected to the side of the chamber 30, and the duct 40 is connected to the bottom surface of the chamber 30. The chamber 30 controls the flow direction of the air flowing in from the duct 40 so that it is toward the nozzle 60. One chamber 30 is connected to one nozzle 60. In other words, four chambers 30 are arranged, the same number as the nozzles 60. The chambers 30 are arranged above the inner panel 18. The shape of the chambers 30 is not particularly specified as long as it can connect the nozzle 60 and the duct 40 in communication with each other.

[0058] Duct 40 is an air duct for transporting air drawn into blower 50 from air inlet 22 to chamber 30. One end of duct 40 is connected to chamber 30, and the other end is connected to blower 50. One duct 40 is provided for each chamber 30. In other words, four ducts 40 are provided. For example, a known flexible duct can be used as duct 40.

[0059] The blower 50 generates an airflow that flows from the air intake port 22 through the duct 40 and the chamber 30 toward the outlets of the nozzles 60 (outlet 61d, outlet 62d, outlet 63d, and outlet 64d). The blower 50 may be a known turbo machine such as a centrifugal blower. One blower 50 is provided for each nozzle 60. That is, four blowers 50 are provided, the same number as the nozzles 60.

[0060] [1-2. Operation] The operation of the blower 1 configured as above will be described below. The flow of the air current generated by the operation of the blower 1 will be described with reference to Figs.

[0061] 2, when blower 50 starts operating, air in the space on the outer periphery of blower device 1 becomes airflow AF4 and is drawn in through air intake port 22. The air drawn in through air intake port 22 (airflow AF4) flows through the inside of duct 40 as airflow AF5 and is transported to chamber 30.

[0062] The air (airflow AF5) transported to chamber 30 has its direction of travel changed from vertical (from the floor board 12 side to the top board 16 side) to horizontal (from the third side panel 14c side to the fourth side panel 14d side) by chamber 30. The air transported to chamber 30 flows through the inside of nozzle 60 as airflow AF6.

[0063] The air (airflow AF6) that flows into the nozzle 60 is blown out as airflow AF1 (airflow AF1a, airflow AF1b, airflow AF1c and airflow AF1d) from the outlets (airflow outlet 61d, airflow outlet 62d, airflow outlet 63d and airflow outlet 64d) downward, i.e., towards the floorboard 12.

[0064] When the airflow AF1 is blown out into the living space 26, the air in the space around the airflow AF1 is attracted by the airflow AF1, and a negative pressure region S1 is generated in the space between adjacent nozzles 60 depending on the amount of air blown out. Here, negative pressure (also called negative pressure) refers to a state in which the air pressure is lower than the surroundings. In other words, the negative pressure region S1 is a region where the air pressure is lower than the surroundings.

[0065] When negative pressure region S1 is generated, a force acts to eliminate the negative pressure, and an induced airflow AF2 (induced airflow AF2a, induced airflow AF2b, and induced airflow AF2c) is generated, which is an airflow for eliminating negative pressure region S1, from the space around nozzle 60. Induced airflow AF2 flows downward, i.e., toward floorboard 12, via induced airflow duct 70 (induced airflow duct 71, induced airflow duct 72, and induced airflow duct 73).

[0066] The airflows AF1a, AF1b, AF1c and AF1d blown out from the air outlets 61d, 62d, 63d and 64d combine with the induced airflows AF2a, AF2b and AF2c to form a surface airflow AF7 which circulates through the living space 26 towards the floorboard 12.

[0067] Furthermore, in a limited space (closed space) such as living space 26, air in the space around induced airflow AF2 (the space near the inlet of induced airflow duct 70) is drawn in by airflow AF2, creating a negative pressure area S2 in the space between nozzle 60 and top board 16. This creates return airflow AF3 (return airflow AF3a and return airflow AF3b), an air flow that resolves negative pressure area S3. Return airflow AF3 flows into negative pressure area S2 (the space between nozzle 60 and top board 16) via return airflow duct 80 (return airflow duct 81 and return airflow 82).

[0068] A part of the air that reaches the floorboard 12 is exhausted as an airflow AF8 from the exhaust port 24 to the space on the outer periphery of the blower device 1.

[0069] As shown in FIG. 3, the other portion of the air that reaches the floorboard 12 is reflected by the floorboard 12 and flows along the side panel 14 (first side panel 14a or second side panel 14b) as return airflow AF3a and return airflow AF3b toward the top board 16.

[0070] A portion of the air of airflow AF1 (airflow AF1a, airflow AF1b, airflow AF1c, and airflow AF1d) that reaches the upper surface of desk 200 is reflected by the upper surface of desk 200 and becomes airflow AF9. Airflow AF9 flows as part of return airflow AF3 (return airflow AF3a and return airflow AF3b) toward top board 16 along side panel 14 (first side panel 14a or second side panel 14b).

[0071] As the surface airflow AF7 circulates as a downward airflow in the central region of the living space 26, a return airflow AF3 circulates in the edge region of the living space 26. That is, in the edge region of the living space 26, the return airflow AF3 circulates along the vicinity of the surface of the side panel 14 (first side panel 14a or second side panel 14b).

[0072] [1-3. Effects, etc.] In the air blower device 1, the distance D between the first nozzle 61 and the first side panel 14a and the distance D between the fourth nozzle 64 and the fourth side panel 14d are greater than the distances d1 and d2 between adjacent nozzles 60. This reduces the ventilation resistance (pressure loss) of the return airflow 80 compared to when the distance D is equal to the distances d1 and d2, concentrating the return airflow AF3 in the return airflow 80 and preventing the return airflow AF3 from occurring in unintended locations (e.g., the induction airflow 70). This makes it possible to prevent the return airflow AF3 from being generated in unintended locations when generating the surface airflow AF7, i.e., a highly linear airflow that flows in the air outlet direction (from the top board 16 side to the floor board 12 side) in the closed living space 26, from disrupting the flow of the surface airflow AF7 due to the return airflow AF3 occurring in unintended locations.

[0073] Furthermore, the return airflow AF3 is air flowing toward the space (negative pressure region S2) between the nozzle 60 and the top board 16, but its direction of flow is different from that of the airflow AF1 and the induced airflow AF2. Therefore, the return airflow AF3 may disturb the flow of the airflow AF1 adjacent to the return airflow AF3, potentially hindering the straightness of the surface airflow AF7. However, when the air volume of the airflow AF1 is constant, the blower device 1 can increase the opening area of ​​the return airflow duct 80 compared to when the distance D is equal to the distances d1 and d2, thereby reducing the wind speed of the return airflow AF3. This reduces the amount of air in the airflow AF1 that is entrained in the return airflow AF3, thereby suppressing the disturbance of the surface airflow AF7 caused by the return airflow AF3.

[0074] (Variation) As described above, the first embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made.

[0075] Therefore, the following provides an example of a modification.

[0076] Although the blower 1 includes four nozzles 60, namely, a first nozzle 61, a second nozzle 62, a third nozzle 63, and a fourth nozzle 64, the number of nozzles is not limited to this. For example, three nozzles or five or more nozzles may be used to generate a surface airflow.

[0077] Furthermore, in the blower device 1, a blower 50 is provided for every four nozzles 60, but this is not limiting. For example, a branch pipe may be used to transport the airflow generated by one blower to multiple nozzles.

[0078] Although the air intake port 22 is rectangular, it is not limited to this shape and may be a polygon other than a rectangle or a circle.

[0079] Although the exhaust port 24 is rectangular, it is not limited to this shape and may be a polygon other than a rectangle or a circle.

[0080] The blower 1 may be provided with a filter for capturing dust contained in the air in the space around the outer periphery of the blower 1, for example, in an air path through which the airflow AF1 passes, such as the air intake port 22. This allows purified air containing less dust and other foreign matter than before passing through the filter to be supplied to the living space 26. In addition, the blower 50 is preferably disposed downstream of the filter. This prevents dust and other foreign matter from accumulating on the blower 50. This reduces the possibility of a tracking phenomenon occurring due to moisture and foreign matter such as dust accumulated on the blower 50.

[0081] Although the living space 26 is a small space that can accommodate an individual, it is not limited to this. For example, the living space 26 may be a space that can accommodate multiple people, such as a conference room of 25 m^2 or less.

[0082] In the blower 1, the nozzles 60 are provided so that the distance d1 is greater than the distance d2, but this is not limited to this. The blower 1 may also be provided so that the distance d1 and the distance d2 are equal, that is, the nozzles 60 are provided at equal intervals.

[0083] (Summary of the Invention) An outline of the present invention is described below.

[0084] The air blower 1 includes a living space 26 having a floor surface (floorboard 12), wall surfaces (side panels 14) erected from the floor surface, and a top surface (top board 16) facing the floor surface, a plurality of nozzles 60 arranged with a space between them and the top surface to blow airflow toward the floor surface, an induction airflow duct 70 through which an induction airflow AF2 is circulated, which is attracted by the airflow blown out from the plurality of nozzles 60 and flows from the space (the space between the top board 16 and the nozzles 60) toward the floor surface, and a return airflow duct 80 through which a return airflow AF3 flows from the floor surface toward the top surface and into the space (the space between the top board 16 and the nozzles 60). The induction airflow duct 70 is provided between adjacent nozzles 60, and the return airflow duct 80 is provided between the wall surface and the nozzles 60. In the blower 1, the distance D between the nozzle 60 and the wall surface forming the return airflow passage 80 is greater than the distance (distance d1 and distance d2) between adjacent nozzles 60 forming the induction airflow passage .

[0085] The nozzle 60 has a nozzle lower surface (61a, 62a, 63a, 64a) having short and long sides, and nozzle side surfaces (61b, 61c, 62b, 62c, 63b, 63c, 64b, 64c) extending from the long sides of the nozzle lower surface toward the ceiling surface. The induction airflow passages 70 are provided between the nozzle side surfaces arranged in parallel along the short sides (between nozzle side surface 61c and nozzle side surface 62b, between nozzle side surface 62c and nozzle side surface 63b, and between nozzle side surface 63c and nozzle side surface 64b). The return airflow passages 80 are provided between the nozzle side surfaces (nozzle side surface 61b, nozzle side surface 64c) of the end nozzles (first nozzle 61, fourth nozzle 64) arranged at the ends of the nozzles 60 arranged in parallel and the wall surface.

[0086] The distance d1 between the nozzles 60 adjacent to the end nozzles (first nozzle 61, fourth nozzle 64) is equal to or greater than the distance d2 between the end nozzles and the other adjacent nozzles 60.

[0087] The end nozzles are a one-end nozzle (first nozzle 61) arranged at one end of the nozzles 60 arranged in parallel, and an other-end nozzle (fourth nozzle 64) arranged at the other end different from the one end of the nozzles 60 arranged in parallel. The return air passage 80 is provided between the nozzle side surface (nozzle side surface 61b) of the one-end nozzle (first nozzle 61) and the wall surface, and between the nozzle side surface (nozzle side surface 64c) of the other-end nozzle (fourth nozzle 64) and the wall surface.

[0088] The distance d3 between the nozzle side surface (nozzle side surface 61b) of the one end nozzle (first nozzle 61) and the nozzle side surface (nozzle side surface 64c) of the other end nozzle (fourth nozzle 64) is 2 / 3 or less of the distance d4 between the wall surfaces in the direction of the short sides of the nozzle undersurfaces (61a, 62a, 63a, 64a). [Industrial Applicability]

[0089] The present disclosure is applicable to a blower that generates a surface airflow (a highly linear airflow along the blowing direction) in a closed living space, where the surface airflow may be disturbed by a return airflow. Specifically, the present disclosure is applicable to a private booth, a conference room, or the like that is equipped with a blowing function capable of generating a surface airflow. [Explanation of symbols]

[0090] 1. Blower 12 Floorboards 14 Side Panel 14a First side panel 14b Second side panel 14c Third Side Panel 14d Fourth Side Panel 16 Top Board 18 Inner panel 20 Doors 22 Air supply port 24 exhaust port 26 Living space 28 Hollow space 30 Chambers 40 Duct 50 Blower 60 nozzles 61 First nozzle 61a Nozzle bottom 61b Nozzle side 61c Nozzle side 61d Air outlet 62 Second Nozzle 62a Nozzle bottom 62b Nozzle side 62c Nozzle side 62d Air outlet 63 Third Nozzle 63a Nozzle bottom 63b Nozzle side 63c Nozzle side 63d air outlet 64 Fourth Nozzle 64a Nozzle bottom 64b Nozzle side 64c Nozzle side 64d Air outlet 70 Induced air duct 71 Induced air duct 72 Induced air duct 73 Induced air duct 80 Return air passage 81 Return air passage 82 Return air passage 200 desks 300 chairs

Claims

1. a living space having a floor surface, a wall surface erected from the floor surface, and a ceiling surface facing the floor surface; a plurality of nozzles arranged with a space between them and the top surface, and blowing airflows toward the floor surface; an induced airflow duct through which an induced airflow is circulated, the induced airflow being attracted by the airflow blown out from the plurality of nozzles and directed from the space toward the floor surface; a return air duct through which a return airflow flows from the floor surface toward the top surface and into the space, The induced air duct is provided between adjacent nozzles, The reflux air path is provided between the wall surface and the nozzle, a distance between the wall surface forming the return airflow path and the nozzle is larger than a distance between the adjacent nozzles forming the induction airflow path; The nozzle is a nozzle underside having a short side and a long side; a nozzle side surface extending from the long side of the nozzle lower surface toward the top surface, and the induction airflow path is provided between the nozzle side surfaces arranged in parallel along the direction of the short sides, The reflux air path is an end nozzle disposed at an end of the nozzles arranged in parallel is provided between the nozzle side surface and the wall surface; The distance between the end nozzle and the adjacent nozzle is: a blower device, the distance between the end nozzles being greater than the distance between adjacent nozzles different from the end nozzles;

2. The end nozzle is a one-end nozzle disposed at one end of the nozzles arranged in parallel; an other-end-side nozzle that is arranged at an end different from the one end among the nozzles arranged in parallel, The reflux air path is a gap between the nozzle side surface and the wall surface of the one-end nozzle; The blower device according to claim 1 , wherein the blower is provided between the nozzle side surface of the other end nozzle and the wall surface.

3. The distance between the nozzle side surface of the one end side nozzle and the nozzle side surface of the other end side nozzle is The blower device according to claim 2 , wherein the distance is equal to or less than two-thirds of the distance between the wall surfaces in the direction of the short sides.

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