JP7808738B2 - air blower - Google Patents

Description

This disclosure relates to a blower device.

Patent Document 1 discloses a blower that generates a highly linear airflow along the blowing direction (hereinafter, this may be referred to as "surface wind" or "surface airflow"). This blower 901 will be described using Figure 4. Figure 4(a) is a perspective view showing the configuration of the blower 901. Figure 4(b) is a cross-sectional view of side A in Figure 4(a). This blower 901 includes a housing 910, an intake port 920 for taking in air, a high-pressure air generator 930 consisting of an impeller for generating high-pressure air and a motor for driving the impeller, and multiple nozzles 940 erected from one side of the housing 910. The nozzles 940 have an outlet 941 on the side that blows out the high-pressure air generated by the high-pressure air generator 930 in a direction perpendicular to the direction in which the nozzles 940 are erected, and a duct 942 for guiding the high-pressure air to the outlet 941. The 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 blowing ports 941 is on the same plane. These gaps form an induced airflow path 950 for air (induced air AF902) that is drawn by the air AF901 blown out from the blowing ports 941. The blower 901 generates a blown airflow AF903, which is a highly rectilinear airflow that flows along the blowing direction, using the air AF901 blown out from the multiple nozzles 940 and the induced air AF902 flowing through the induced airflow path 950.

Japanese Patent Application Laid-Open No. 2017-115629

Let's consider the case where a conventional blower is installed in a booth or other enclosed living space to generate a surface airflow from the ceiling toward the floor. In the limited space of a booth, if a sufficient return airflow duct is not secured to guide the return airflow that flows into the induction airflow duct to generate an induced airflow, air may flow into the induction airflow duct from an unintended location. In this case, air will no longer 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 when generating a surface airflow in a closed living space such as a booth, in that the flow of the surface airflow is disrupted by the return airflow.

One of the purposes of this disclosure is to provide a blower that can prevent the flow of surface airflow (highly linear airflow along the blowing direction) in a closed living space from being disturbed by return airflow.

The air blower device disclosed herein comprises a living space having a floor, a wall rising from the floor, and a ceiling facing the floor; a plurality of nozzles arranged with a space between them and the ceiling and blowing air 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 circulated that flows from the floor toward the ceiling and 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.

The air blower disclosed herein can prevent the flow of surface airflow (highly linear airflow along the blowing direction) in a closed living space from being disturbed by return airflow.

FIG. 1 is a perspective view showing the configuration of a blower device according to the first embodiment. FIG. 2 is a side view schematically showing the flow of air generated by the blower device in the first embodiment. FIG. 3 is a front view schematically showing the flow of air generated by the blower device in the first embodiment. FIG. 4 is a diagram showing the configuration of a conventional blower.

Embodiments will be described in detail below with reference to the drawings. However, more detailed explanations than necessary may be omitted. For example, detailed explanations of matters that are already well known or duplicate explanations of substantially identical configurations may be omitted. This is to avoid making the following explanation unnecessarily redundant and to make it easier for those skilled in the art to understand.

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.

(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 the airflow generated by the blower 1. FIG. 3 is a front view showing the flow of the airflow generated by the blower 1. Note that in FIG. 2, the flow of the airflow is shown without distinguishing between the first nozzle 61, the second nozzle 62, the third nozzle 63, and the fourth nozzle 64.

[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, with a nozzle 60 disposed 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, a chair 300, etc. for remote work or study, and can also be called a private booth.

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

The floorboard 12 is a rectangular board placed on the floor side of the blower 1.

The side panels 14 are composed of four rectangular plates: 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.

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

The second side panel 14b is a side panel 14 positioned opposite 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.

The third side panel 14c is a side panel 14 provided with an air intake vent 22, and is adjacent to one side end of the first side panel 14a and one side end of the second side panel 14b.

The fourth side panel 14d is positioned opposite the third side panel 14c, is a side panel 14 provided with an exhaust vent 24, and is adjacent to the other end of the first side panel 14a and the other end of the second side panel 14b.

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

The inner panel 18 is a rectangular plate that divides the space formed by the floorboard 12, side panel 14, and 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 located on the floorboard 12, closer to the third side panel 14c than the door 20.

The living space 26 is a space where users of the blower device 1 can enter, exit, and stay. The living space 26 is formed by the floorboard 12, the side panels 14 (first side panel 14a, second side panel 14b, and fourth side panel 14d), the top board 16, and the inner panel 18. As shown in FIG. 1(b), a desk 200 and a chair 300 are placed in predetermined positions in the living space 26.

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

The desk 200 is a piece of furniture on which users staying in the living space 26 can place their computers, documents, etc. and work. The desk 200 is installed against the fourth side panel 14d.

The chair 300 is a piece of furniture for users staying in the living space 26 to sit on. The chair 300 is installed in contact with the inner panel 18.

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 connected to the living space 26. The hollow space 28 contains the chamber 30, the duct 40, and the blower 50.

The air intake port 22 is a square opening for supplying air from the space on the outer periphery of the blower 1 to the living space 26, and is located below the center of the height of the living space 26 in the third side panel 14c. When the blower 50 operates, the air intake port 22 draws air from the space on the outer periphery of the blower 1.

The exhaust port 24 is a square opening for discharging air from the living space 26 into the space surrounding the blower 1, and is located below the center of the living space 26 in the height direction, in the fourth side panel 14d. The exhaust port 24 discharges air from the living space 26 when the blower 50 is operating.

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 Figures 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.

As shown in FIG. 2, the nozzle 60 extends horizontally from above the inner panel 18 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, a position at least 200 cm above the floorboard 12 in the living space 26. "Extended 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.

In embodiment 1, a total of four nozzles 60, namely a first nozzle 61, a second nozzle 62, a third nozzle 63, and a fourth nozzle 64, are arranged in parallel from the first side panel 14a toward the second side panel 14b.

The first nozzle 61 has a nozzle lower surface 61a, a nozzle side surface 61b, and a nozzle side surface 61c, and is positioned at the location of the nozzle 60 closest to the first side panel 14a.

The nozzle underside 61a is a rectangular flat plate formed by short and long sides, and is positioned opposite the floorboard 12. The nozzle underside 61a has an air outlet 61d.

The air outlet 61d is a rectangular opening with 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 underside 61a are arranged approximately parallel to each other. The long sides of the air outlet 61d and the long sides of the nozzle underside 61a are arranged approximately parallel to each other.

Nozzle side surface 61b and nozzle side surface 61c are rectangular flat plates extending from the long side of nozzle lower surface 61a toward the top board 16. Nozzle side surface 61b is located opposite the first side panel 14a. Nozzle side surface 61c is located opposite the second nozzle 62.

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

The nozzle underside 62a is a rectangular flat plate formed by short and long sides, and is positioned opposite the floorboard 12. The nozzle underside 62a has an air outlet 62d.

The air outlet 62d is a rectangular opening with 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 underside 62a are arranged approximately parallel to each other. The long sides of the air outlet 62d and the long sides of the nozzle underside 62a are arranged approximately parallel to each other.

Nozzle side surface 62b and nozzle side surface 62c are rectangular flat plates extending from the long side of nozzle lower surface 62a toward the top board 16. Nozzle side surface 62b is located opposite the first nozzle 61. Nozzle side surface 62c is located opposite the third nozzle 63.

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

The nozzle underside 63a is a rectangular flat plate formed by short and long sides, and is positioned opposite the floorboard 12. The nozzle underside 63a has an air outlet 63d.

The air outlet 63d is a rectangular opening with short and long sides, and blows out the air transported to the third nozzle 63 as an airflow AF1c. The short sides of the air outlet 63d and the short sides of the nozzle underside 63a are arranged approximately parallel to each other. The long sides of the air outlet 63d and the long sides of the nozzle underside 63a are arranged approximately parallel to each other.

Nozzle side surface 63b and nozzle side surface 63c are rectangular flat plates extending from the long side of nozzle lower surface 63a toward the top board 16. Nozzle side surface 63b is located opposite the second nozzle 62. Nozzle side surface 63c is located opposite the fourth nozzle 64.

The fourth nozzle 64 has a nozzle lower surface 64a, a nozzle side surface 64b, and a nozzle side surface 64c, and is positioned at the location of the nozzle 60 closest to the second side panel 14b.

The nozzle underside 64a is a rectangular flat plate formed by short and long sides, and is positioned opposite the floorboard 12. The nozzle underside 64a has an air outlet 64d.

The air outlet 64d is a rectangular opening with 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 underside 64a are arranged approximately parallel to each other. The long sides of the air outlet 64d and the long sides of the nozzle underside 64a are arranged approximately parallel to each other.

Nozzle side surface 64b and nozzle side surface 64c are rectangular flat plates extending from the long side of nozzle lower surface 64a toward the top board 16. Nozzle side surface 64b is located opposite the third nozzle 63. Nozzle side surface 64c is located opposite the second side panel 14b.

Air outlets 61d, 62d, 63d, and 64d are arranged on the same horizontal plane. In other words, in the living space 26, air outlets 61d, 62d, 63d, and 64d are arranged at the same height from the floorboard 12.

The induced airflow 70 is 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 circulates the induced airflow AF2 from the space between the nozzles 60 and the top board 16 toward the floorboard 12. In embodiment 1, the induced airflow 70 comprises three induced airflow ducts 71, 72, and 73, each provided between adjacent nozzles 60. More specifically, the induced airflow ducts 71, 72, and 73 are provided between nozzles 60 arranged in parallel along the short side direction of the nozzle undersurfaces 61a, 62a, 63a, and 64a.

The induced airflow duct 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 from the space between the nozzle 60 and the top board 16 toward the floorboard 12. The induced airflow duct 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.

The induced airflow duct 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 from the space between the nozzle 60 and the top board 16 toward the floorboard 12. The induced airflow duct 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.

The induced airflow duct 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 floorboard 12. The induced airflow duct 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.

The return air 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 embodiment 1, the return air duct 80 includes return air ducts 81 and 82, each of which is provided between the side panel 14 and the nozzle 60.

The return airflow duct 81 circulates the return airflow AF3a, which is adjacent to the airflow AF1a, of the return airflow AF3. The return airflow duct 81 is provided between the nozzle side surface 61b and the first side panel 14a. The distance (spacing) between the nozzle side surface 61b and the first side panel 14a is D = 390 mm.

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

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

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 underside 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. There is no particular requirement for the shape of the chamber 30, as long as it can connect the nozzle 60 and the duct 40 in communication with each other.

The duct 40 is an air duct that transports air drawn into the blower 50 from the air intake port 22 to the chamber 30. One end of the duct 40 is connected to the chamber 30, and the other end is connected to the blower 50. One duct 40 is provided for each chamber 30. In other words, four ducts 40 are provided. The duct 40 can be, for example, a known flexible duct.

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

[1-2. Operation]
The operation of the blower 1 configured as above will now be described. The flow of the airflow generated by the operation of the blower 1 will be described with reference to FIGS.

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

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

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) downward from the outlets (airflow outlet 61d, airflow outlet 62d, airflow outlet 63d, and airflow outlet 64d), i.e., toward the floorboard 12.

When the airflow AF1 is blown out into the living space 26, the air in the space around the airflow AF1 is drawn toward the airflow AF1, and a negative pressure region S1 is generated in the space between adjacent nozzles 60 depending on the volume 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.

When negative pressure area S1 is created, a force acts to eliminate the negative pressure, generating induced airflow AF2 (induced airflow AF2a, induced airflow AF2b, and induced airflow AF2c) which is an air flow that eliminates negative pressure area S1 from the space around nozzle 60. Induced airflow AF2 flows downward, i.e., toward floorboard 12, via induced airflow 70 (induced airflow 71, induced airflow 72, and induced airflow 73).

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

Furthermore, in a limited space (closed space) such as living space 26, air in the space surrounding 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 duct 82).

A portion of the air that reaches the floorboard 12 is exhausted as airflow AF8 from the exhaust port 24 into the space around the outer periphery of the blower device 1.

As shown in Figure 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.

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

As the surface airflow AF7 circulates as a downward airflow in the central region of the living space 26, the return airflow AF3 circulates in the edge region of the living space 26. In other words, 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).

[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 airflow resistance (pressure loss) of the return airflow 80 compared to when the distance D is equal to the distances d1 and d2. This allows the return airflow AF3 to be concentrated in the return airflow 80, preventing the return airflow AF3 from being generated in an unintended location (e.g., the induction airflow 70). This prevents the return airflow AF3 from being generated in an unintended location when generating the surface airflow AF7, i.e., a highly linear airflow along the blowing direction (from the top board 16 side to the floor board 12 side) in the closed living space 26.

Furthermore, the return airflow AF3 is air flowing toward the space between the nozzle 60 and the top board 16 (negative pressure area S2), but its direction of flow is different from that of the airflow AF1 and the induction airflow AF2. Therefore, the return airflow AF3 can disturb the flow of the adjacent airflow AF1, 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 distance D is equal to 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 disturbance of the surface airflow AF7 caused by the return airflow AF3.

(Modification)
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 be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made.

Below, we will provide some examples of modified examples.

The blower device 1 is equipped with four nozzles 60, namely, a first nozzle 61, a second nozzle 62, a third nozzle 63, and a fourth nozzle 64, but this is not limited to this. For example, three nozzles or five or more nozzles may be used to generate a surface airflow.

Furthermore, while the blower device 1 is configured with a blower 50 installed for every four nozzles 60, this is not limited to this. For example, a branch pipe may be used to transport the airflow generated by one blower to multiple nozzles.

The air intake vent 22 is rectangular, but is not limited to this and may be polygonal or circular.

The exhaust port 24 is rectangular, but is not limited to this and may be polygonal or circular.

The blower 1 may be provided with a filter for capturing dust contained in the air in the space around the blower 1, for example, in the 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 to be supplied to the living space 26 than before passing through the filter. It is also preferable to position the blower 50 downstream of the filter. This prevents dust and other foreign matter from accumulating on the blower 50. This reduces the possibility of tracking occurring due to moisture and dust and other foreign matter accumulated on the blower 50.

The living space 26 is a small space that can accommodate an individual, but 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.

In the blower device 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 device 1 may also be provided so that the distances d1 and d2 are equal, i.e., the nozzles 60 are evenly spaced.

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

The air blower 1 comprises a living space 26 having a floor (floorboard 12), walls (side panels 14) extending from the floor, and a ceiling (top board 16) facing the floor; a plurality of nozzles 60 arranged with a space between them and the ceiling to blow air toward the floor; an induction air duct 70 through which an induction airflow AF2 is drawn by the airflow blown 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; and a return air duct 80 through which a return airflow AF3 flows from the floor toward the ceiling and into the space (the space between the top board 16 and the nozzles 60). The induction air ducts 70 are provided between adjacent nozzles 60, and the return air duct 80 is provided between the wall and the nozzles 60. In the air blower 1, the distance D between the wall surface forming the return air passage 80 and the nozzle 60 is greater than the distance (distance d1 and distance d2) between adjacent nozzles 60 forming the induction air passage 70.

The nozzle 60 has a nozzle underside (61a, 62a, 63a, 64a) with short and long sides, and nozzle side surfaces (61b, 61c, 62b, 62c, 63b, 63c, 64b, 64c) extending from the long sides of the nozzle underside toward the ceiling. The induction airflow ducts 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 ducts 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 parallel nozzle arrangement and the wall surface.

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 adjacent nozzles 60 other than the end nozzles.

The end nozzles are a one-end nozzle (first nozzle 61) located at one end of the nozzles 60 arranged in parallel, and an other-end nozzle (fourth nozzle 64) located at the other end of the nozzles 60 arranged in parallel. The return air duct 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.

The distance d3 between the nozzle side surface (nozzle side surface 61b) of the nozzle at one end (first nozzle 61) and the nozzle side surface (nozzle side surface 64c) of the nozzle at the other end (fourth nozzle 64) is less than two-thirds of the distance d4 between the wall surfaces in the direction of the short sides of the nozzle undersides (61a, 62a, 63a, 64a).

This disclosure is applicable to air blowers that generate surface airflow (highly linear airflow along the blowing direction) in enclosed living spaces, where turbulence in the surface airflow due to return airflow may occur. Specifically, this disclosure is applicable to private booths, conference rooms, and other spaces equipped with a blowing function that can generate surface airflow.

REFERENCE SIGNS LIST 1 Blower device 12 Floorboard 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 Door 22 Air intake port 24 Exhaust port 26 Living space 28 Hollow space 30 Chamber 40 Duct 50 Blower 60 Nozzle 61 First nozzle 61a Nozzle bottom surface 61b Nozzle side surface 61c Nozzle side surface 61d Air outlet 62 Second nozzle 62a Nozzle bottom surface 62b Nozzle side surface 62c Nozzle side surface 62d Air outlet 63 Third nozzle 63a Nozzle bottom surface 63b Nozzle side surface 63c Nozzle side surface 63d Air outlet 64 Fourth nozzle 64a Nozzle bottom surface 64b Nozzle side surface 64c Nozzle side 64d Air outlet 70 Induced air path 71 Induced air path 72 Induced air path 73 Induced air path 80 Return air path 81 Return air path 82 Return air path 200 Desk 300 Chair

Claims (3)

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 return air passage 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 return air passage 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 ; 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 return air passage 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. 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.