JP2024064112A - Ventilation system - Google Patents

Abstract

To provide a technology capable of improving a wind speed distribution of a uniform downflow airflow at a face position of a user, when forming a flow of the air perpendicularly downward from an upper part of a space, in a blower system in which an air blowing surface is installed on a top surface side of the space.SOLUTION: In a blower system 1, an air blowing surface 2c is installed on a top surface 2a side which is above heads of users, in an internal space S1 in which users can face each other sandwiching a desk 30. The blower system includes: a plurality of nozzles 5 having a blowout port 8 for blowing out the air flowing from the top surface 2a side toward a bottom surface 2b side of the internal space S1; and a blower 9 for blowing the air sucked from a suction port 6 to the inside of the nozzle 5 from one side out of both end parts of the nozzle 5. The plurality of nozzles 5 is arranged side by side having a gap so that the blowout ports 8 are positioned on the same surface, and constitutes the air blowing surface 2c. To the nozzles 5 adjacent to each other, the air is introduced into the nozzles 5 from directions different from each other by the blower 9.SELECTED DRAWING: Figure 1

Description

The present invention relates to a ventilation system.

As a conventional ventilation system, for example, an air conditioning system (airflow environment system) has been proposed in which multiple blowing nozzles are arranged in parallel at the top of the space to create a vertical downward air flow (air current) from the top of the space, preventing the spread of viruses or aerosols (see, for example, Patent Document 1).

JP 2022-117409 A

However, with conventional ventilation systems, the air sent from the ventilation unit has inertia, so the airflow tends to be biased toward the tip of the nozzle at the user's face position, resulting in a decrease in wind speed at the base of the nozzle.

The object of the present invention is to provide an air blowing system in which the air blowing surface is installed on the ceiling side of a space, which is capable of improving the uniform wind speed distribution of the downflow airflow at the position of the user's face when forming a vertical downward airflow from the top of the space.

The air blowing system according to the present invention is an air blowing system in which an air blowing surface is installed on the top surface of a specific space above the users' heads in a specific space where users can face each other across a desk, and is equipped with a plurality of blowing nozzles arranged on the top surface of the specific space and having slit-shaped blowing outlets that blow air flowing from the top surface side of the specific space toward the floor surface side of the specific space, an intake port for drawing air into the specific space, and a blower that blows the air drawn in from the intake port into the inside of the blowing nozzle from one of both ends of the blowing nozzle. The plurality of blowing nozzles are arranged side by side with gaps between them so that the blowing outlets are located on the same plane, forming an air blowing surface, and air is introduced into the interior of the blowing nozzles of adjacent blowing nozzles from different directions by the blower. This achieves the above-mentioned object.

According to the present invention, in a ventilation system in which a ventilation surface is installed on the ceiling side of a space, when forming a vertical downward air flow from the upper part of the space, it is possible to provide a ventilation system that can improve the uniform wind speed distribution of the downflow airflow at the position of the user's face.

FIG. 1 is an external perspective view showing a structure of a ventilation system according to a first embodiment of the present invention. FIG. 2(a) is a schematic cross-sectional view showing the internal structure of an air blowing system that supplies air to a nozzle from a first side space, and FIG. 2(b) is a schematic cross-sectional view showing the internal structure of an air blowing system that supplies air to a nozzle from a second side space. FIG. 3 is a schematic cross-sectional view showing the flow of airflow blown out of a nozzle of the blowing system. FIG. 4 is a schematic cross-sectional view showing the flow of air currents in the ventilation system. FIG. 5(a) is a top view showing the airflow inside the nozzle of the air blowing system of embodiment 1, and FIG. 5(b) is a top view showing the airflow inside the nozzle of the air blowing system of the comparative example. FIG. 6(a) is a schematic cross-sectional view showing the airflow distribution blown out from a nozzle of the air blowing system according to embodiment 1, and FIG. 6(b) is a schematic cross-sectional view showing the airflow distribution blown out from a nozzle of the air blowing system according to the comparative example. FIG. 7 is an external perspective view showing the structure of a ventilation system according to the second embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing the structure of a ventilation system according to the second embodiment of the present invention.

(Embodiment 1)
Hereinafter, the air blowing system 1 according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is an external perspective view showing the structure of the air blowing system 1 according to the first embodiment of the present invention. Fig. 2(a) is a schematic cross-sectional view showing the internal structure of the air blowing system 1 that supplies air from the first side space 3 to the first nozzle group 5a, and Fig. 2(b) is a schematic cross-sectional view showing the internal structure of the air blowing system 1 that supplies air from the second side space 4 to the second nozzle group 5b.

[1-1. Configuration]
The air blowing system 1 is a system in which an air blowing surface is installed on the top surface side of the internal space S1 above the users' heads in an internal space S1 where users can face each other across a desk 30, and the air blowing system 1 blows air to the users. Specifically, as shown in Fig. 1, the air blowing system 1 includes a frame 2 having a lattice-shaped top surface 2a, a first side space 3, a second side space 4, a plurality of nozzles 5, an intake port 6, an air blowing section 7, and an outlet port 8. As shown in Fig. 2, the air blowing section 7 is configured to have a blower 9 therein.

The frame 2 is a rectangular parallelepiped framework structure that surrounds the target space, and is composed of, for example, four pillars and four beams (horizontal members) that connect the upper ends of the pillars. Here, the space surrounded by the frame 2 is referred to as the "internal space S1," and the space outside the frame 2, which has a lattice-like top surface 2a, is referred to as the "external space S2."

The internal space S1 is equipped with a desk 30 and a monitor 31 that users can use while facing each other, and is a space in which users can face each other across the desk 30. The internal space S1 corresponds to the "specific space" in the claims.

The desk 30 is installed on the bottom surface 2b of a conference room or the like, and is used by users facing each other. A total of six chairs are installed on the desk 30 so that users can sit facing each other.

The monitor 31 is installed on the side wall of the first side space 3 and displays the screen of the user's computer, etc.

The top surface 2a is located at a predetermined height in the space above the user's head. On the top surface 2a side, the air outlets 8 of multiple nozzles 5 are arranged side by side with gaps between them so that they are positioned on the same plane along the top surface 2a.

The bottom surface 2b corresponds to the surface under the user's feet. The bottom surface 2b can also be referred to as the floor surface.

The air blowing surface 2c is a plane formed by the air outlets 8 of the multiple nozzles 5 when the multiple nozzles 5 are arranged side by side with gaps between them, and is approximately parallel to the bottom surface 2b.

The first side space 3 is a rectangular parallelepiped space that is positioned perpendicular to the bottom surface 2b and extends from the bottom surface 2b toward the top surface 2a. The first side space 3 is formed by a specific housing, and can be considered a structure with a hollow interior.

The second side space 4 is a rectangular parallelepiped space that extends in the same manner as the first side space 3. The second side space 4 is formed by a specific housing, and can be said to be a structure with a hollow interior. The second side space 4 is located symmetrically to the first side space 3 with respect to the multiple nozzles 5. The second side space 4 may also be read as the first side space 3.

The multiple nozzles 5 are components that generate a surface airflow (an airflow that is linear in the blowing direction as a whole) as a downward airflow from the top surface 2a side toward the bottom surface 2b. The multiple nozzles 5 all have the same length in the extension direction. Each of the multiple nozzles 5 has a hollow structure through which air can flow, a vertical cross section in the extension direction that is vertically long, and an air outlet 8 on the underside side in the direction in which the air is blown out. The nozzles 5 correspond to the "blowout nozzle" in the claims.

More specifically, the multiple nozzles 5 are installed between the side wall of the first side space 3 and the side wall of the second side space 4, and are arranged with a gap between them so that the air outlets 8 are located on the same plane. When viewed from the front of the first side space 3, the multiple nozzles 5 have a first nozzle group 5a consisting of odd-numbered nozzles from the left side, and a second nozzle group 5b consisting of even-numbered nozzles. In other words, the multiple nozzles 5 are installed so that one nozzle from the first nozzle group 5a and one nozzle from the second nozzle group 5b are alternately installed.

The first nozzle group 5a communicates with the internal space of the first side space 3, and is supplied with air sent by the blower 9a in the blowing section 7a. In other words, since one of the two ends of the nozzle 5 (the second side space 4 side) is blocked by the cap 10b, the first nozzle group 5a does not communicate with the internal space of the second side space 4, and air sent by the blower 9b in the blowing section 7b is not supplied.

The second nozzle group 5b communicates with the internal space of the second side space 4, and is supplied with air sent by the blower 9b in the blowing section 7b. In other words, since one of the two ends of the nozzle 5 (the first side space 3 side) is blocked by the cap 10a, the second nozzle group 5b does not communicate with the internal space of the first side space 3, and air sent by the blower 9a in the blowing section 7a is not supplied.

The suction port 6a in the first side space 3 is an opening for drawing air from the internal space S1 of the frame body 2 into the inside of the blower section 7a, i.e., into the inside of the first side space 3. The suction port 6a is disposed on the bottom surface 2b side of the front of the blower section 7a, and draws in air from the space in front of the suction port 6a. The suction port 6a is also formed across the entire width of the front panel.

The suction port 6b in the second side space 4 is an opening for drawing air from the internal space S1 of the frame body 2 into the inside of the blower section 7b, i.e., into the inside of the second side space 4. The suction port 6b is disposed on the bottom surface 2b side of the front of the blower section 7b, and draws in air from the space in front of the suction port 6b. The suction port 6b is also formed across the entire width of the front panel.

The air blowing section 7a in the first side space 3 has a blower 9a. The air blowing section 7a may have an air purification filter (not shown) built in upstream of the blower 9a to collect dust and other particles. This allows air containing less dust and other foreign matter to be sent to the internal space S1 compared to before it passed through the air purification filter.

The blower 9a is a centrifugal fan. A motor (not shown) for rotating the blower 9a is connected to the blower 9a, and rotating the motor rotates the blower 9a to generate an air flow. The blower 9a blows air sucked in from the suction port 6a into the inside of the first nozzle group 5a from one of the two ends of the first nozzle group 5a (the first side space 3 side).

The blower section 7b in the second side space 4 has a blower 9b. The blower section 7b may have an air purification filter (not shown) built in upstream of the blower 9b to collect dust and other particles. This allows air containing less dust and other foreign matter to be sent to the internal space S1 compared to before it passed through the air purification filter.

The blower 9b is a centrifugal fan. A motor (not shown) for rotating the blower 9b is connected to the blower 9b, and rotating the motor rotates the blower 9b to generate an air flow. The blower 9b blows air sucked in from the suction port 6b into the interior of the second nozzle group 5b from one of the two ends of the second nozzle group 5b (the second side space 4 side).

The air outlets 8 are slit-shaped openings formed by the short and long sides on the underside of each of the multiple nozzles 5. The air outlets 8 have an air outlet 8a corresponding to the first nozzle group 5a and an air outlet 8b corresponding to the second nozzle group 5b.

The air outlet 8a is connected to the first side space 3 via the first nozzle group 5a, and blows air from the blower section 7a toward the bottom surface 2b.

The air outlet 8b is connected to the second side space 4 via the second nozzle group 5b, and blows air from the blower section 7b toward the bottom surface 2b.

[1-2. motion]
Next, the flow of air currents in the air blowing system 1 will be described with reference to Figs. 2 to 4. Fig. 2 is a schematic cross-sectional view showing the flow of air currents in the air blowing system 1. Fig. 3 is a schematic cross-sectional view of the air blowing system 1. 2 to 4, the length of the arrows indicating the respective airflows is longer than the length of the arrows indicating the respective airflows. The length indicates the magnitude of the blowing speed of the air. Note that Fig. 2(a) shows a cross section at a position close to the first side space 3 side. Also, in Fig. 3, the first side space 3 is shown on the left side. Although the state in which one nozzle group 5a is arranged on the right side and the second nozzle group 5b is arranged on the right side is shown, the same applies when the positions are reversed.

In the air blowing system 1, as shown in FIG. 2(a), when the air blowing section 7a (blower 9a) starts blowing, the air sucked in from the suction port 6a flows through the internal space of the first side space 3 as airflow 20a. The circulating airflow 20a is then blown out from the outlet 8a of the first nozzle group 5a as outlet airflow 21a. In the second side space 4, as shown in FIG. 2(b), when the air blowing section 7b (blower 9b) starts blowing, the air sucked in from the suction port 6b flows through the internal space of the second side space 4 as airflow 20b. The circulating airflow 20b is then blown out from the outlet 8b of the second nozzle group 5b as outlet airflow 21b.

As described above, the blowing outlets 8 (blowing outlets 8a and 8b) of the multiple nozzles 5 are arranged side by side with gaps so that the blowing outlets 8 are located on the same plane on the top surface 2a side. Therefore, as shown in FIG. 3, in the multiple nozzles 5, the blowing airflow 21 (blowing airflow 21a and blowing airflow 21b) creates a negative pressure area S3 in the gap between adjacent nozzles 5, and air from the external space S2 is attracted into this negative pressure area S3 and introduced into the internal space S1 as an induced airflow 22. The blowing airflow 21 and the induced airflow 22 then combine to form an airflow 23.

More specifically, as shown in FIG. 4, when the blown airflows 21 (blown airflows 21a and 21b) are blown from a plurality of nozzles 5 (first nozzle group 5a and second nozzle group 5b), induced airflows 22 are generated at a plurality of locations in the gaps between adjacent nozzles 5, forming an overall surface airflow (airflow 23). As a result, the airflow 23 flows toward the bottom surface 2b.

In the air blowing system 1, air is introduced into each blowing nozzle group (first nozzle group 5a and second nozzle group 5b) from different directions for the multiple nozzles 5, and the operation is shown in detail in Figures 5 and 6. Figure 5(a) is a top view showing the airflow inside the nozzle of the air blowing system 1 according to the first embodiment, and Figure 5(b) is a top view showing the airflow inside the nozzle of the air blowing system according to the comparative example. Figure 6(a) is a schematic cross-sectional view showing the airflow distribution blown out from the nozzle 5 of the air blowing system 1 according to the first embodiment, and Figure 6(b) is a schematic cross-sectional view showing the airflow distribution blown out from the blowing nozzle group 5c of the air blowing system according to the comparative example.

When the blower 7 (blower 9) starts operating, the air that has circulated through the internal space of the first side space 3 or the second side space 4 flows into the internal space of the nozzle 5.

As a comparative example, when air is introduced into the blowing nozzle group 5c from the same direction, as in the conventional method, the air supply direction is only one direction from the first side space 3 side to the second side space 4 side, as shown in FIG. 5(b). In this case, due to the inertia of the air flow 20c sent out by the blower 9c, the distribution of the blowing air flow 21c has a tendency to gradually increase in wind speed from the first side space 3 side, which is the base side of the multiple blowing nozzle groups 5c, to the second side space 4, as shown in FIG. 6(b), and the distribution of the induced air flow (not shown) is also uneven when viewed from the side. As a result, the wind speed distribution of the surface air flow formed by the air flow 23c (not shown) also has an uneven wind speed distribution in which the wind speed becomes weaker as it approaches the first side space 3 and the wind speed becomes stronger as it approaches the second side space 4.

In contrast, in the configuration of the blower system 1 according to the first embodiment, as shown in FIG. 5(a), the air that has flowed through the internal space of the first side space 3 by the cap 10 (cap 10a or cap 10b) flows into the internal space of the first nozzle group 5a, and the air that has flowed through the internal space of the second side space 4 flows into the internal space of the second nozzle group 5b. In other words, the nozzles of the first nozzle group 5a and the nozzles of the second nozzle group 5b are arranged alternately in the nozzles in the supply direction from the first side space 3 to the second side space 4 and the nozzles in the supply direction from the second side space 4 to the first side space 3. The air that has flowed through each internal space has a wind speed distribution in which the blown airflow 21 becomes faster as it approaches the cap 10 side due to inertia, as shown in FIG. 6(a). More specifically, due to the inertia of the airflow 20a sent out by the blower 9a, the distribution of the blown airflow 21a has a tendency for the wind speed to gradually increase from the first side space 3 side, which is the root side of the first nozzle group 5a, toward the second side space 4 side. On the other hand, due to the inertia of the airflow 20b sent out by the blower 9b, the distribution of the blown airflow 21b has a tendency for the wind speed to gradually increase from the second side space 4 side, which is the root side of the second nozzle group 5b, toward the first side space 3 side. In other words, the first nozzle group 5a and the second nozzle group 5b have wind speed distributions with opposing tendencies. As a result, in FIG. 4, the total speed of the airflows blown out from the first nozzle group 5a and the second nozzle group 5b becomes substantially uniform, and the distribution of the induced airflow 22 also becomes uniform reflecting this. As a result, the wind speed distribution of the surface airflow formed by the airflow 23 also becomes uniform. In other words, a downflow airflow with a uniform wind speed distribution can be obtained at the position of the user's face.

[1-3. Effects, etc.]
As described above, according to the air blowing system 1 according to the first embodiment, the following effects can be obtained.

(1) In the internal space S1 where users can face each other across a desk 30, the air blowing system 1 is installed on the top surface 2a of the internal space S1, which is above the users' heads. The air blowing system 1 is provided with a plurality of nozzles 5 arranged on the top surface 2a of the internal space S1, each having a slit-shaped air outlet 8 that blows out air flowing from the top surface 2a of the internal space S1 toward the bottom surface 2b of the internal space S1, an intake port 6 for drawing air into the internal space S1, and a blower 9 that blows the air (airflow 20) drawn in from the intake port 6 into the nozzle 5 from one of both ends of the nozzle 5. The plurality of nozzles 5 are arranged side by side with a gap between them so that the air outlets 8 are located on the same plane, forming the air blowing surface 2c. The adjacent nozzles 5 are configured so that the air (airflow 20) is introduced into the nozzle 5 from different directions by the blower 9.

With this configuration, a downflow occurs as a surface airflow in the direction from the top surface 2a to the bottom surface 2b in the internal space S1 used by the users. In other words, the air blowing system 1 can be made capable of suppressing the movement of aerosols or viruses between users. In addition, by introducing air into each blowing nozzle group (first nozzle group 5a and second nozzle group 5b) from different directions, a surface airflow with a uniform wind speed distribution can be obtained, and the movement of aerosols in the direction facing the users can be suppressed even when multiple users are in various positions.

In other words, in a ventilation system 1 in which the ventilation surface 2c is installed on the top surface 2a side of the space, when forming a vertical downward air flow from the top of the internal space S1, it is possible to provide a ventilation system 1 that can improve the uniform wind speed distribution of the downflow airflow at the position of the user's face.

(2) The ventilation system 1 may further include an air purification filter that purifies the air (airflow 20) sucked in by the blower 9. In this way, aerosols or viruses emitted by the user can be captured by the air purification filter, and clean air can be delivered to the internal space S1, providing the user with safe and secure air.

(Embodiment 2)
Next, a blower system 101 according to a second embodiment of the present invention will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is an external perspective view showing the structure of the blower system 101 according to the second embodiment of the present invention. Fig. 8 is a schematic cross-sectional view showing the structure of the blower system 101 according to the second embodiment of the present invention.

The air blowing system 101 according to the second embodiment differs from the first embodiment in that the air flow (blowout airflow 121) blown out vertically downward from the air blowing surface 2c forms an air curtain that crosses between users facing each other across the desk 130. The rest of the configuration of the air blowing system 101 is the same as that of the air blowing system 1 according to the first embodiment. Below, the contents already explained in the first embodiment will not be explained again as appropriate, and the differences from the first embodiment will be mainly explained.

[2-1. Configuration]
The air blowing system 101 is a system that blows airflow so as to block the space between users facing each other in a state where the users can face each other across a desk 130 (for example, when the users are seated on chairs not shown). Specifically, as shown in Fig. 7, the air blowing system 101 is configured with two side columns 102 that form a first side space 103 and a second side space 104, two nozzles 105 that connect the two side columns 102, an intake port 106, an exhaust port 108, and a desk 130.

The desk 130 is placed in a conference room or the like and is used by users facing each other. The desk 130 is composed of a rectangular top plate 130a and legs 130b that support the top plate 130a. As will be described in detail later, the legs 130b are provided with a member therein that corresponds to the blower unit 7 of the blower system 1 according to embodiment 1. Side columns 102 are installed on opposing sides of the desk 130.

The top plate 130a is a flat member on which a user can place a computer or documents and work. The top plate 130a may have an opening (not shown) in its central area that serves as a passageway for air blown out from the air blowing surface 2c.

The legs 130b are made up of four plates, and on two opposing sides, openings 130c that serve as gaps leading to the suction port 106 are provided on the bottom surface 2b side. Side columns 102 are provided on the other two opposing sides.

The two side columns 102 are hollow column members that stand upright on one opposing side of the desk 130 from the bottom surface 2b to a position at a predetermined height that becomes the top surface 2a (for example, a position above the head of a user sitting on a chair). The two side columns 102 are connected by two nozzles 105 at a position on the top surface 2a side. The two side columns 102 are each internally connected to the two nozzles 105. More specifically, one of the two side columns 102 forms a first side space 103 on the side of the desk 130 (the left side surface in FIG. 7) and is connected in communication with the first nozzle 105a. The other of the two side columns 102 forms a second side space 104 on the side of the desk 130 (the right side surface in FIG. 7) and is connected in communication with the second nozzle 105b. Each of the two side columns 102 is also connected to the blower 109 via a duct 107 installed inside the leg 130b on the bottom surface 2b side (see Figure 8).

The top surface 2a is a surface that is defined at a predetermined height from the bottom surface 2b by two side columns 102. Two nozzles 105 are arranged side by side along the top surface 2a with a gap between them so that the air outlets 108 are positioned on the same plane.

The bottom surface 2b corresponds to the surface under the user's feet. The bottom surface 2b is also the surface on which the desk 130 and side pillars 102 are placed.

The air blowing surface 2c is a plane formed by the air outlets 108 of the two nozzles 105 when the two nozzles 105 are arranged side by side with a gap between them, and is approximately parallel to the top plate 130a (or bottom surface 2b) of the desk 130. In this embodiment, the space in the area where air (airflow 123 described later) is blown downward from the air blowing surface 2c is referred to as the "internal space S1," and the space outside the internal space S1 is referred to as the "external space S2."

The first side space 103 is located perpendicular to the bottom surface 2b, is the internal space of the side column 102, and is a rectangular parallelepiped space extending from the bottom surface 2b to the top surface 2a.

The second side space 104 is a rectangular parallelepiped space that extends in the same manner as the first side space 103, and is located symmetrically to the first side space 103 with respect to the two nozzles 105. The second side space 104 may also be read as the first side space 103.

The two nozzles 105 are installed between the side wall of the first side space 103 and the side wall of the second side space 104, and are arranged with a gap between them so that the air outlets 108 are located on the same plane. The nozzles 105 are a first nozzle 105a and a second nozzle 105b. In this embodiment, two nozzles 105 are used, but the air blowing surface 2c may be formed by the air outlets 108 of three or four or more nozzles 105.

8, the first nozzle 105a is in communication with the internal space of the first side space 103, and is supplied with air (airflow 120a) sent by the blower 109a through the duct 107a and the first side space 103. In other words, since one of the two ends of the nozzle 105 (the second side space 104 side) is closed by the cap 110b, the first nozzle 105a is not in communication with the internal space of the second side space 104, and air (airflow 120b) sent by the blower 109b is not supplied.

The second nozzle 105b is in communication with the internal space of the second side space 104, and is supplied with air (airflow 120b) sent by the blower 109b through the duct 107b and the second side space 104. In other words, the second nozzle 105b is not in communication with the internal space of the first side space 103, since one of the two ends of the nozzle 105 (the first side space 103 side) is blocked by the cap 110a (not shown), and the air (airflow 120a) sent by the blower 109a is not supplied.

The intake port 106 is an opening for sucking air from the space below the leg 130b into the inside of the blower 109. The intake port 106 has an intake port 106a that communicates with the blower 109a, and an intake port 106b that communicates with the blower 109b.

The intake port 106a is an opening for drawing air from the space below the leg 130b into the inside of the blower 109a. The intake port 6a is located in the space below the leg 130b, for example on the bottom surface 2b.

The intake port 106b is an opening for drawing air from the space below the leg 130b into the inside of the blower 109b. The intake port 6b is located in the space below the leg 130b, for example on the bottom surface 2b.

The blower 109 is a centrifugal fan. A motor (not shown) for rotating the blower 109 is connected to the blower 109, and rotating the motor rotates the blower 109 to generate an air flow. More specifically, the blower 109 has blower 109a and blower 109b. An air purification filter (not shown) for collecting dust and the like may be built in on the upstream side of the blower 109. This allows air containing less dust and other foreign matter to be sent to the internal space S1 compared to before passing through the air purification filter.

The blower 109 is installed on the bottom surface 2b in the space below the legs 130b of the desk 130, and has a blower 109a that blows air toward the first side space 103, and a blower 109b that blows air toward the second side space 104.

The blower 109a blows air drawn in from the suction port 106a into the inside of the first nozzle group 5a from one of the two ends of the first nozzle 105a (the first side space 3 side).

The blower 109b blows air drawn in from the suction port 106b into the inside of the first nozzle group 5a from one of the two ends of the second nozzle 105b (the first side space 3 side).

The air outlet 108 is a slit-shaped opening formed by the short and long sides on the underside of each of the two nozzles 105. The air outlet 108 has an air outlet 108a corresponding to the first nozzle 105a and an air outlet 108b corresponding to the second nozzle 105b.

The air outlet 108a is connected to the first side space 103 via the first nozzle 105a, and blows air from the blower 109a toward the top plate 130a (bottom surface 2b side) of the desk 130.

The air outlet 108b is connected to the second side space 104 via the second nozzle 105b, and blows air from the blower 109b toward the top plate 130a (bottom surface 2b side) of the desk 130.

As will be described in more detail later, the air outlets 108 of the two nozzles 105 are arranged on the top surface 2a side of the internal space S1 so that the airflow 121 blown out from the air outlets 108 crosses between users facing each other across the desk 130.

[2-2. motion]
Next, the flow of air currents in the blower system 101 will be described with reference to FIG.

In the air blowing system 101, as shown in FIG. 8, when the blower 109a starts blowing, it sucks in air from the suction port 106a through the space below the leg 130b of the desk 130. The sucked air flows through the internal space of the first side space 103 as airflow 120a. The circulating airflow 120a is then blown out as the blown airflow 121a from the blower port 108a of the first nozzle 105a. On the other hand, when the blower 109b starts blowing, it sucks in air from the suction port 106b through the space below the leg 130b of the desk 130. The sucked air flows through the internal space of the second side space 104 as airflow 120b. The circulating airflow 120b is then blown out as the blown airflow 121b from the blower port 108b of the second nozzle 105b (not shown). After being blown out, as in the first embodiment, the blown airflows 121a and 121b generate an induced airflow 122 (not shown), and the blown airflows 121a and 121b join with the induced airflow 122 (not shown) to form an airflow 123, which becomes a surface airflow and is blown out as a downflow onto the upper surface of the desk 130 (the upper surface of the tabletop 130a). This downflow forms an air partition airflow that crosses between the users facing each other across the desk 130. After that, the air partition airflow collides with the upper surface of the desk 130, changes direction, travels straight toward the seating positions of the users, and is released into the external space S2.

In the air blowing system 101, air is introduced into the first nozzle 105a and the second nozzle 105b from different directions for the two nozzles 105. Specifically, in the first nozzle 105a, the air that has been circulated through the internal space of the first side space 103 by the cap 110b flows into the internal space of the first nozzle 105a, and the air supply direction is from the first side space 103 side to the second side space 104 side. On the other hand, in the second nozzle 105b, the air that has been circulated through the internal space of the second side space 104 by the cap 110a (not shown) flows into the internal space of the second nozzle 105b, and the air supply direction is from the second side space 104 side to the first side space 103 side. That is, similar to the nozzle 5 of the first embodiment, the first nozzle 105a and the second nozzle 105b are arranged alternately with the nozzles in the air supply direction from the first side space 103 side to the second side space 104 side and the nozzles in the air supply direction from the second side space 104 side to the first side space 103 side. As a result, the wind speed distribution of the surface airflow formed by the airflow 123 is also uniform. In other words, a downflow airflow with a uniform wind speed distribution can be formed as an air partition airflow that crosses between users facing each other across the desk 130.

[2-3. Effects, etc.]
As described above, according to the air blowing system 101 according to the second embodiment, the following effects can be obtained.

(1a) In the internal space S1 where users can face each other across a desk 130, the air blowing system 101 has an air blowing surface 2c installed on the top surface 2a of the internal space S1, which is above the users' heads. The air blowing system 101 is arranged on the top surface 2a of the internal space S1 and includes two nozzles 105 (first nozzle 105a and second nozzle 105b) having slit-shaped air outlets 108 that blow out air (airflow 123) flowing from the top surface 2a of the internal space S1 toward the bottom surface 2b of the internal space S1 (top plate 130a of the desk 130), an intake port 106 for drawing air into the internal space S1, and a blower 109 that blows the air (airflow 120) drawn from the intake port 106 into the inside of the nozzle 105 from one of both ends of the nozzle 105. The two nozzles 105 are arranged side by side with a gap between them so that the air outlets 108 are located on the same plane, forming the air blowing surface 2c. The adjacent nozzles 105 are configured so that air (airflow 120) is introduced into the nozzles 105 from different directions by the blower 109.

With this configuration, a downflow occurs as a surface airflow in the direction from the top surface 2a to the bottom surface 2b in the internal space S1 used by the users. In other words, the air blowing system 101 can be made capable of suppressing the movement of aerosols or viruses between users. In addition, by introducing air into the two nozzles 105 (first nozzle 105a and second nozzle 105b) from different directions, a surface airflow with a uniform wind speed distribution can be obtained, and the movement of aerosols in the direction facing the users can be suppressed across multiple users.

In other words, in the air blowing system 101 in which the air blowing surface 2c is installed on the top surface 2a side of the space, when forming a vertical downward air flow from the top of the internal space S1, it is possible to provide an air blowing system 1 that can improve the uniform wind speed distribution of the downflow airflow at the position of the user's face.

(2a) In the air blowing system 101, the multiple nozzles 105 are arranged on the top surface 2a side of the internal space S1 so that the airflow (airflow 121) blown out from the outlets 108 of the multiple (two) nozzles 105 crosses between users facing each other across the desk 130. With this configuration, the airflow 123 is a surface airflow that is a combination of the outlet airflow 121a blown out from the outlet 108a of the first nozzle 105a, the outlet airflow 121b blown out from the outlet 108b of the second nozzle 105b, and the induced airflow 122 induced by the outlet airflow 121a and the outlet airflow 121b, so that an air partition airflow having a thickness equivalent to three layers of airflow can be formed. In other words, the air blowing system 101 can be configured to reliably suppress the movement of aerosols or viruses between users facing each other.

(3a) The air blowing system 101 may further include an air purification filter that purifies the air drawn in by the blower 109. In this way, aerosols or viruses emitted by the user can be captured by the filter. In other words, a clean space can be provided for the user.

Although the present invention has been described above based on the embodiments, the present invention is in no way limited to the above embodiments, and it can be easily imagined that various improvements and modifications are possible within the scope of the spirit of the present invention. For example, the numerical values given in the above embodiments are merely examples, and it is of course possible to adopt other numerical values.

In the air blowing system 1, 101 according to the present embodiment, eight or two nozzles are used as the number of nozzles, but more of each may be used. In this way, the width of the downflow air current can be expanded, and the effect of more reliably suppressing the movement of aerosols or viruses can be enjoyed.

In addition, in the air blowing system according to the second embodiment, an intake port (not shown) may be provided on the top surface of the desk 130 (top surface of the tabletop 130a) to suck in the airflow blown out from the outlets 108 of the two (or more) nozzles 105. In this case, it is preferable to further provide an air purification filter for purifying the air at the intake port provided on the top surface of the desk 130. In this way, aerosols or viruses emitted by users can be allowed to settle by the air partition airflow and then sucked in directly from the intake port on the top surface of the desk 130, making it possible to suppress the movement of aerosols or viruses between users sitting on the same side of the air partition airflow. In other words, this can be achieved by providing a clean space for users.

When multiple people are using the air supply system of the present invention, it is possible to prevent aerosols emitted by the user from reaching the person sitting opposite, making it useful as an air supply system to be installed in a specific space where multiple people can be present.

REFERENCE SIGNS LIST 1 Air blowing system 2 Frame 2a Top surface 2b Bottom surface 2c Air blowing surface 3 First side space 4 Second side space 5 Nozzle 5a First nozzle group 5b Second nozzle group 5c Blowing nozzle group 6, 6a, 6b, 6c Intake port 7, 7a, 7b, 7c Blowing section 8, 8a, 8b, 8c Blowing port 9, 9a, 9b, 9c Blower 10, 10a, 10b, 10c Cap 20a, 20b, 20c Air flow 21, 21a, 21b, 21c Blowing air flow 22 Induced air flow 23, 23c Air flow 30 Desk 31 Monitor 101 Air blowing system 102 Side pillar 103 First side space 104 Second side space 105 Nozzle 105a First nozzle 105b Second nozzle 106, 106a, 106b Intake port 107, 107a, 107b Duct 108, 108a, 108b Air outlet 109, 109a, 109b Fan 110, 110a, 110b Cap 120a, 120b Air flow 121, 121a, 121b Airflow 122 Induced airflow 123 Airflow 130 Desk 130a Tabletop 130b Legs 130c Opening S1 Internal space S2 External space S3 Negative pressure area

Claims (4)

A ventilation system in which a ventilation surface is installed on the top surface side of a specific space where users can face each other across a desk, the specific space being above the users' heads,
A plurality of blow-out nozzles are arranged on a ceiling side of the specific space, and each of the blow-out nozzles has a slit-shaped blow-out port that blows out air flowing from the ceiling side of the specific space toward a floor side of the specific space;
An intake port for drawing air into the specific space;
a blower that blows the air sucked from the suction port into the inside of the blow-out nozzle from one of both end portions of the blow-out nozzle,
The plurality of blowing nozzles are arranged side by side with gaps between them so that the blowing outlets are located on the same plane, forming the air blowing surface;
An air blowing system, wherein the air is introduced into the adjacent blowing nozzles from different directions by the blower. The air blowing system according to claim 1, wherein the plurality of blowing nozzles are arranged on the ceiling side of the specific space so that the airflow blown out from the blowing outlets of the plurality of blowing nozzles crosses between the users facing each other across the desk. The air blowing system according to claim 1 or 2, further comprising an air purification filter that purifies the air drawn in by the blower. The air blowing system according to claim 2, further comprising an intake port on the top surface of the desk for sucking in the airflow blown out from the outlets of the multiple blowing nozzles.

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