Personal Air Conditioning System

Abstract

To provide a personal air conditioning system capable of facilitating direction control of an air current, and capable of finely adjusting a path of the air current.SOLUTION: A personal air conditioning system 1 of this invention for air-conditioning a task space surrounded by a booth wall 20 vertically installed includes: a blowout slit which has a longitudinal direction along an installed portion of the booth wall 20 and blows out temperature-adjusted air to a vertical upper side; a first air current direction adjusting plate 30 which is attached so as to be adjustable in attitude with respect to the booth wall 20 and to which the air blown out of the blowout slit 10 is abutted; and a second air current direction adjusting plate 40 which is attached to the booth wall 20 and to which the air blown out from the blowout slit 10 through a space between the first air current direction adjusting plate and the booth wall 20 is abutted.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a personal air conditioning system that enables intuitive and simple adjustment of air conditioning in a task space and makes it easy to quickly find the optimal air direction. [Background technology]

[0002] In recent years, in offices, in order to improve productivity, it has become important to provide a space where workers can concentrate on their work, and one method that has been proposed for achieving this is to use partitions or other dividers to create separate work spaces.

[0003] In such offices, one issue to consider is maintaining a comfortable temperature environment in the individual work spaces (task spaces) around workers, in relation to the ambient space throughout the room. Proposals have been made for floor-blowout air conditioning systems that efficiently blow temperature-controlled air into task spaces.

[0004] For example, Patent Document 1 (Japanese Utility Model Application Publication No. 5-59150) discloses an air conditioning system equipped with a blowing device of an underfloor air conditioning unit, which comprises a unit having a blower, a duct, and an outlet in a panel member, the outlet of the panel member being formed as a circular hole into which a disk-shaped outlet member is rotatably fitted, and the outlet slit member being provided with an inclined air direction plate.

[0005] In the conventional technology described in Patent Document 1, the blowing direction can be adjusted, but the angle is limited, and the parts of the body that the airflow can reach are also limited. In addition, in this conventional technology, the air direction adjustment unit is installed on the floor, so the worker must bend down to adjust the blowing direction angle. Adjusting the blowing direction while bending down is particularly difficult in a task space that is narrower than a general office space.

[0006] Furthermore, with this conventional technology, it was difficult to intuitively judge the direction of the wind after adjustment using the wind direction adjustment unit, and there was also the problem that the way the wind was blowing could not be confirmed until one had sat down after making the adjustment. [Patent Document 1] Japanese Utility Model Application Publication No. 5-59150 [Patent Document 2] Patent Application No. 2019-034612 [Patent Document 3] Patent Application No. 2019-125820 Summary of the Invention [Problem to be solved by the invention]

[0007] To solve the above problems, the inventors proposed a personal air conditioning system in Patent Document 2 (Patent Application No. 2019-034612) that utilizes an air outlet slit provided on the floor near the wall of the private booth and an airflow adjustment plate installed on the wall to supply airflow locally to the body of the worker. In this proposal, the worker can move the airflow adjustment plate to an appropriate position on the wall so that the airflow reaches the part of the body that he or she wants to cool down, thereby realizing a personal air conditioning system with a higher degree of freedom.

[0008] In the personal air conditioning system proposed in the invention of Patent Document 2, in order to change the airflow direction, the worker must turn around within the task space and then adjust the height of the airflow direction adjustment plate.

[0009] Since such adjustment of the wind direction is necessary, it was expected that the ease of use could be further improved by automating it using a personal computer, etc. Although it is technically possible to automate the method of changing the height of the baffle plates in the invention of Patent Document 2, in order to aim for cost reduction, it was necessary to devise a system that changes the trajectory of the airflow in a different way to the system of Patent Document 2.

[0010] Therefore, in the invention related to Patent Document 3, the inventors proposed a system that adjusts the wind direction when supplying air to workers by changing the angle of the baffle board. In this system, when changing the trajectory of the airflow at the air outlet position, the angle of the baffle board can be simply changed, similar to the mechanism for adjusting the wind direction of a normal home air conditioner. However, in the series of personal air conditioners for booths that have been developed so far, even if attempts were made to control the wind direction at the air outlet position, the airflow would adhere to the booth due to the Coanda effect with the floor or wall because the air outlet is close to the booth wall or floor, making it impossible to control as intended.

[0011] The invention in Patent Document 3, which adjusts the airflow direction not at the air outlet position but vertically above it, has a problem in that it is difficult to control the airflow direction by simply changing the angle of the baffle plate installed on the wall surface. The reason for this is as follows.

[0012] In the series of personal air conditioning systems proposed so far, a part of the wall jet that is blown out from the air outlet and formed on the booth wall is received by a baffle, and the trajectory is adjusted by changing the direction of the airflow. In such a system, when the angle φ of the baffle is changed as shown in Fig. 18, the area of ​​the wall jet that the baffle receives is reduced. As shown in Fig. 18, for example, when the angle of a baffle that rotates with the end of length l1 in close contact with the wall is set, it becomes √3l1 / 2 at 30° and l1 / 2 at 60°. Therefore, when the angle is changed to change the flow of the wall jet, the trajectory of the airflow changes significantly with a slight change in angle from a certain angle due to (the effect of the baffle angle becoming larger + the effect of the area of ​​the jet that collides with the baffle becoming smaller), and there was a problem that fine adjustment becomes difficult. [Means for solving the problem]

[0013] The present invention is directed to solving the above-mentioned problems, and the personal air conditioning system of the present invention is a personal air conditioning system for conditioning a task space surrounded by vertically installed booth walls, and is characterized in having an outlet slit having a longitudinal direction along the installation portion of the booth wall and blowing temperature-controlled air vertically upward, a first air direction adjustment plate attached to the booth wall so that its posture can be adjusted and against which the air blown out of the outlet slit hits, and a second air direction adjustment plate attached to the booth wall and against which the air blown out of the outlet slit hits between the first air direction adjustment plate and the booth wall.

[0014] In addition, the personal air conditioning system of the present invention is characterized in that it has a rotating shaft having an axial center parallel to the longitudinal direction of the outlet slit, and the first air flow adjustment plate is attached to the rotating shaft, and as the rotating shaft rotates, the first air flow adjustment plate adjusts the airflow direction of the air blown out of the outlet slit.

[0015] Moreover, the personal air conditioning system according to the present invention is characterized in that the first airflow direction adjustment plate is attached to the rotating shaft at an end portion of the first airflow direction adjustment plate.

[0016] In the personal air conditioning system according to the present invention, the first airflow direction adjusting plate is configured to rotate about the rotation axis. standard When the above-mentioned configuration is adopted, the rotation shaft is configured to extend not only in one direction but also in the other direction in a predetermined direction perpendicular to the axial direction of the rotation shaft.

[0017] In addition, the personal air conditioning system of the present invention is characterized in that the second air direction adjustment plate has two vertical side panels extending vertically downward from both ends perpendicular to the longitudinal direction of the air outlet slit, and two bearings provided on each of the vertical side panels, and the rotating shaft is passed between the bearings.

[0018] In addition, the personal air conditioning system of the present invention is characterized in that the first air direction adjustment plate has a first plate portion extending in the axial direction of the rotating shaft and a second plate portion connected to the first plate portion via a boundary portion, and in a cross-sectional view perpendicular to the axial direction of the rotating shaft, the longitudinal direction of the first plate portion and the longitudinal direction of the second plate portion are configured to intersect.

[0019] In addition, the personal air conditioning system of the present invention is characterized in that, in a cross-sectional view perpendicular to the axial direction of the rotating shaft, the length of the first plate portion in the longitudinal direction is longer than the length of the second plate portion in the longitudinal direction.

[0020] In addition, the personal air conditioning system of the present invention is characterized in that when the end of the first plate portion farthest from the boundary between the first plate portion and the second plate portion abuts the floor surface, the end of the second plate portion farthest from the boundary between the first plate portion and the second plate portion abuts the booth wall. Effect of the Invention

[0021] The personal air conditioning system according to the present invention is composed of two airflow direction adjustment plates, a first airflow direction adjustment plate that is attached to the booth wall in an adjustable position and hits the air blown out from the blowing slit, and a second airflow direction adjustment plate that is attached to the booth wall and hits the air blown out from the blowing slit through between the first airflow direction adjustment plate and the booth wall, and it is possible to guide a composite jet of a jet that collides with the first airflow direction adjustment plate and a jet that collides with the second airflow direction adjustment plate disposed downstream of the first airflow direction adjustment plate into a task space. With such a personal air conditioning system according to the present invention, as the adjustment angle (φ) of the first airflow direction adjustment plate increases, the influence of the jet formed by the second airflow direction adjustment plate increases, making it easy to control the direction of the airflow by changing the adjustment angle (φ) of the first airflow direction adjustment plate, and also making it possible to fine-tune the trajectory of the airflow.

[0022] Furthermore, in a personal air conditioning system according to another embodiment of the present invention, in cases where an office worker does not want to be directly exposed to the temperature-conditioned airflow, the first airflow direction adjustment plate can be used to block the path of the airflow flowing vertically upward from the outlet slit, thereby preventing the airflow from being directed directly at the office worker and also enabling ventilation within the task space enclosed by the booth walls. [Brief description of the drawings]

[0023] [Figure 1] 1 is a diagram showing a task space 5 in a personal air-conditioning system 1 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a side view of the task space 5. [Diagram 3] FIG. 2 is a diagram illustrating details of an airflow direction adjustment mechanism of the personal air conditioning system 1 according to the embodiment of the present invention. [Figure 4] FIG. 2 is a diagram illustrating an image of airflow caused by an airflow direction adjustment mechanism of the personal air conditioning system 1 according to the embodiment of the present invention. [Diagram 5] 4A to 4C are diagrams illustrating a mounting form of a first airflow direction adjustment plate 30. [Figure 6] 4A to 4C are diagrams illustrating a mounting form of a first airflow direction adjustment plate 30. [Figure 7] FIG. 1 shows a model of a wind direction adjustment mechanism used in CFD. [Figure 8] FIG. 13 is a diagram showing a comparison of airflow trajectories due to airflow direction adjustment mechanisms based on CFD (airflow direction adjustment plate angle φ=0°). [Figure 9] FIG. 13 is a diagram showing a comparison of airflow trajectories with airflow direction adjustment mechanisms based on CFD (airflow direction adjustment plate angle φ=14°). [Figure 10] FIG. 13 is a diagram showing a comparison of airflow trajectories with airflow direction adjustment mechanisms based on CFD (airflow direction adjustment plate angle φ=28°). [Figure 11] FIG. 13 is a diagram showing a comparison of airflow trajectories with airflow direction adjustment mechanisms based on CFD (airflow direction adjustment plate angle φ=42°). [Figure 12] FIG. 13 is a diagram showing a comparison of airflow trajectories with airflow direction adjustment mechanisms based on CFD (airflow direction adjustment plate angle φ=56°). [Figure 13] FIG. 1 shows the non-dimensional profile of a two-dimensional wall jet. [Figure 14] FIG. 13 is a diagram showing the cumulative distribution of the dimensionless momentum of a two-dimensional wall jet. [Figure 15] FIG. 2 is a diagram for explaining various parameters. [Figure 16] FIG. 11 is a diagram illustrating parameter settings relating to a second airflow direction adjustment plate. [Figure 17] 13 is a diagram showing an image of an air current colliding with a second airflow direction adjustment plate. FIG. [Figure 18] FIG. 1 is a diagram showing a personal air conditioning system according to a conventional example. [Figure 19] 13 is a diagram showing a first airflow direction adjusting plate 30 used in a personal air conditioning system 1 according to another embodiment of the present invention. FIG. [Figure 20] FIG. 11 is a diagram illustrating parameter settings in a personal air conditioning system 1 according to another embodiment. [Figure 21] 1 is a diagram showing a configuration in the vicinity of a rotation axis 31. FIG. [Figure 22] 13 is a graph showing the relationship between the distance d and a1 and a2 when the width b of the blow-out slit 10 is different. [Diagram 23] 11A and 11B are diagrams illustrating an example of angle adjustment of a first airflow direction adjustment plate 30. [Figure 24] 13 is an image diagram showing the airflow caused by adjusting the angle of the first airflow direction adjusting plate 30. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing a task space 5 in a personal air-conditioning system 1 according to an embodiment of the present invention, and Fig. 2 is a side view of the task space 5. In the personal air-conditioning system 1 according to the present invention, a task space 5, which is a work space for an worker M, is set in an ambient space (not shown) which corresponds to the entire room.

[0025] In the personal air-conditioning system 1 according to the present invention, the worker M is surrounded on all four sides by four booth walls 20a, 20b, 20c, and 20d that are installed vertically, forming a task space 5. The blow-out slit 10 has a longitudinal direction that is aligned with the installation portion of one of the four booth walls 20, booth wall 20a, on the floor board 60, and is configured to blow out temperature-adjusted air. The temperature- and humidity-adjusted air blown out from the blow-out slit 10 is generated by a well-known air conditioner (not shown). In the ambient space (not shown), the temperature and humidity of the entire room are also adjusted by an air conditioner (not shown).

[0026] Here, in the ambient space and the task space 5, as shown in the figure, the direction along the longitudinal direction of the blow-out slit 10 is defined as the x-direction, the direction perpendicular to the x-direction in the horizontal plane is defined as the y-direction, and the vertical upward is defined as the z-direction. The x-direction is also called the width direction, the y-direction the depth direction, and the z-direction the height direction.

[0027] In the personal air-conditioning system 1 of the present invention, temperature and humidity-adjusted air is blown out vertically upward (z direction) from the blow-out slits 10 arranged along the installation portion of the booth wall 20a as described above (along the x direction). The airflow direction of the air blown out from the blow-out slits 10 is adjusted by an airflow direction adjustment mechanism described later, and the trajectory of the airflow of the temperature and humidity-adjusted air is changed so as to be comfortable for the worker M in the task space 5.

[0028] FIG. 3 is a diagram illustrating details of the airflow direction adjustment mechanism of the personal air conditioning system 1 according to an embodiment of the present invention, and FIG. 4 is a diagram illustrating an image of the airflow caused by the airflow direction adjustment mechanism of the personal air conditioning system 1 according to an embodiment of the present invention.

[0029] The air blown out from the blowing slits 10 provided along the installation portion of the booth wall 20a rises as the air current adheres to (flows along) the booth wall surface of the booth wall 20a due to the Coanda effect. Such an ascending air current is referred to as a wall jet in this specification, and in the drawings, this wall jet is indicated by the distribution of arrows indicating the strength of the air current.

[0030] In the personal air conditioning system 1 of the present invention, the temperature-adjusted air blown out vertically upward from the air outlet slit 10 as described above is influenced by an air direction adjustment mechanism consisting of two air direction adjustment plates, a first air direction adjustment plate 30 and a second air direction adjustment plate 40, so that the air direction is changed.

[0031] The first airflow direction adjustment plate 30 is disposed at a first height (Y H1 ) and is attached to the booth wall 20a with a predetermined gap 28 therebetween, so that the airflow direction of the air blown out from the blow-out slits 10 can be adjusted.

[0032] Here, the airflow direction adjustment mechanism includes a rotating shaft 31 having an axial center parallel to the longitudinal direction (x direction) of the blow-out slit 10. The direction in which the line that is the axial center of the rotating shaft 31 extends is defined as the "axial direction". The axial direction is parallel to the x direction. The rotating shaft 31 is supported by an appropriate supporting means, and is separated from the wall surface of the booth wall 20a by, for example, a distance χ (a distance equivalent to the gap 28).

[0033] An end of the first airflow direction adjustment plate 30 is attached to this rotating shaft 31, and the angle (φ) of the first airflow direction adjustment plate 30 with respect to the horizontal plane can be changed by rotating the rotating shaft 31. In other words, the attitude of the first airflow direction adjustment plate 30 can be adjusted. This makes it possible for the first airflow adjustment plate 30 to be hit by the air blown out from the blowing slits 10 and to adjust the airflow direction of the air blown out from the blowing slits 10.

[0034] The second airflow direction adjustment plate 40 is disposed vertically above the air outlet slit 10 at the first height (Y H1) higher than the second height (Y H1 +Y H2 ) The first airflow direction adjustment plate 30 is disposed at a distance χ from the wall surface of the booth wall 20a, whereas the second airflow direction adjustment plate 40 is directly attached to the booth wall 20a. The second airflow direction adjustment plate 40 is fixed, and its position cannot be adjusted. The second airflow direction adjustment plate 40 is disposed so that its lower main surface is parallel (horizontal) to the xy plane.

[0035] In the personal air conditioning system 1 of the present invention, the rotation axis 31 of the first airflow direction adjustment plate 30 is slightly separated from the wall surface, and beyond that is a second airflow direction adjustment plate 40 (or a frame member, etc.) that is arranged horizontally to the floor surface, forming an airflow direction adjustment mechanism.

[0036] In this type of airflow direction adjustment mechanism, the wall jet blown out of the blowout slit 10 and flowing in from the bottom first collides with the first airflow direction adjustment plate 30 (length l1 in the y direction), which can change its angle around a rotation axis 31 extending in the x direction, and the second airflow direction adjustment plate 40 (length l2 in the y direction) which is provided at the end of the first airflow direction adjustment plate 30 perpendicular to the booth wall (protruding horizontally into the booth). The first airflow direction adjustment plate 30 has a gap 28 (distance χ) between it and the booth wall. When the first airflow direction adjustment plate 30 rotates, it behaves as shown in the box in FIG. 3, but if the rotation axis 31 is provided at the end of the first airflow direction adjustment plate 30, the gap distance χ of this gap 28 does not depend on the angle of the first airflow direction adjustment plate 30.

[0037] As shown in the image in FIG. 4, if the gap 28 (distance χ) is long enough for the airflow to escape, specifically if it is open by about 5 to 10 mm, the airflow from the wall jet near the booth wall will pass through the gap 28 (distance χ) and flow to the second airflow direction adjustment plate 40. After that, the jet that collides with the second airflow direction adjustment plate 40 (air blown out from the blow-out slit 10 and hits the second airflow direction adjustment plate 40) changes its direction of travel and flows almost horizontally to the floor surface. The jet J1 that collides with the first airflow direction adjustment plate 30 tries to flow at an angle θ, but is combined with the jet J2 that collides with the second airflow direction adjustment plate 40, which flows almost horizontally, and as a result, it becomes the jet J3 that flows at an angle θ' smaller than the angle θ.

[0038] In this embodiment, the gap 28 (distance χ) is set to a range of approximately 5 to 10 mm, but the setting of the distance χ can be changed depending on the dimensions and shape of the blowout slit 10.

[0039] While the angle φ of the first airflow direction adjustment plate 30 is small, there is not much difference from the conventional method of Figure 18, but as φ increases, the difference between the presence and absence of J2 formed by the second airflow direction adjustment plate 40 becomes greater, making it easier to control the direction of the airflow by changing φ.

[0040] As described above, the personal air-conditioning system 1 according to the present invention is composed of two airflow direction adjustment plates, the first airflow direction adjustment plate 30, which is attached to the booth wall 20a with a predetermined gap therebetween and whose position is adjustable, and the second airflow direction adjustment plate 40, which is attached directly to the booth wall 20a and whose position is not adjustable, and it is possible to guide a composite jet of a jet that collides with the first airflow direction adjustment plate 30 and a jet that collides with the second airflow direction adjustment plate 40 disposed downstream of the first airflow direction adjustment plate 30, into the task space 5. According to the personal air-conditioning system 1 according to the present invention, as the adjustment angle (φ) of the first airflow direction adjustment plate 30 increases, the influence of the jet formed by the second airflow direction adjustment plate 40 increases, so that it becomes easy to control the direction of the airflow by changing the adjustment angle (φ) of the first airflow direction adjustment plate 30, and it is also possible to fine-tune the trajectory of the airflow.

[0041] 5 and 6 are diagrams for explaining the mounting form of the first airflow direction adjustment plate 30. In the personal air conditioning system 1 according to the present invention, it is sufficient that the rotation shaft 31 is provided at a predetermined distance from the booth wall 20a. Therefore, as shown in FIG. 5(a), the first airflow direction adjustment plate 30 may be mounted on the rotation shaft 31 at an end of the first airflow direction adjustment plate 30, but as shown in FIG. 5(b), the first airflow direction adjustment plate 30 may be mounted on the rotation shaft 31 at a position other than the end of the first airflow direction adjustment plate 30. That is, the first airflow direction adjustment plate 30 is configured to extend not only in one direction but also in the other direction in a predetermined direction perpendicular to the x direction, when the rotation shaft 31 extending in the x direction is used as a reference. Here, "a plate extends in a certain direction" refers to a state in which the main surface of the plate spreads in that certain direction.

[0042] 5(b), the rotating shaft 31 may be separated from the wall surface of the booth wall 20a, and the first airflow direction adjustment plate 30 may be close to the wall surface of the booth wall 20a within a range where the plate can rotate. In this case, as the angle φ of the first airflow direction adjustment plate 30 increases, the gap 28 gradually widens, and the gap 28 opens sufficiently, particularly when the angle φ at which the present airflow direction adjustment mechanism is effective is large.

[0043] 6, the first airflow direction adjustment plate 30 is attached using a vertical side plate extending from the second airflow direction adjustment plate 40. The second airflow direction adjustment plate 40 does not need to be plate-shaped, and may be a U-shaped frame that also serves to receive the rotating shaft 31.

[0044] Referring to FIG. 7(b) in addition to FIG. 6, the second airflow direction adjustment plate 40 has a structure having two vertical side plates 42 extending vertically downward (-z direction) from both ends which are perpendicular (y direction) to the longitudinal direction (x direction) of the air outlet slit, and two bearings 45 provided on each of the vertical side plates 42.

[0045] The angle of the first wind direction adjustment plate 30 can be adjusted by attaching the rotating shaft 31 across the bearings 45 provided on the two vertical side plates 42. With this configuration, the first wind direction adjustment plate 30 and the second wind direction adjustment plate 40 can be unitized, improving workability. The CFD described below was verified using a wind direction adjustment mechanism with such a structure.

[0046] Here, an example of a method for changing the angle (φ) of the first airflow direction adjustment plate 30 as described above will be described with reference to Figures 1 and 2. In the task space 5, a desk 50, a personal computer 53, lighting 55, etc. can be provided for a worker M who is seated on a chair.

[0047] In the personal air conditioning system 1 of this embodiment, by utilizing the air outlet slits 10 provided on the floor surface near the wall surface of the booth wall 20a of the task space 5 and the first air direction adjustment plate 30 and the second air direction adjustment plate 40 installed on the wall surface of the booth wall 20a, personal air conditioning can supply airflow locally to the body of the worker M, and the angle (φ) of the first air direction adjustment plate 30 can be changed to fine-tune the direction of the air supplied to the worker.

[0048] In this embodiment, the gap 28 is provided, and the first airflow direction adjustment plate 30 is arranged vertically above the blow-out slit 10, and is configured to be rotatable around a rotation axis 31 having an axial direction parallel to the longitudinal direction (x direction) of the blow-out slit 10. Although such a first airflow direction adjustment plate 30 can be configured to be adjusted manually, the first airflow direction adjustment plate 30 can also be rotated by a drive unit other than human power. As a drive unit (not shown) that rotates the first airflow direction adjustment plate 30 around the rotation axis 31, for example, a configuration including a motor, gears, etc. can be used.

[0049] The booth wall 20c facing the booth wall 20a on the back side of the worker M on which the first airflow direction adjustment plate 30 is provided is located in the direction that the worker M faces when working. It is preferable that an operation instruction unit 54 that issues control instructions to the drive unit (not shown) is provided on such booth wall 20c that faces the worker M. When the worker M operates such an operation instruction unit 54, the drive unit (not shown) can adjust the angle φ of the first airflow direction adjustment plate 30 to change the airflow direction.

[0050] In this embodiment, the operation instruction unit 54 that issues control instructions to the drive unit (not shown) is provided on the booth wall 20c facing the face of the worker M, but the function of such operation instruction unit 54 can also be configured to be imparted to software installed on the personal computer 53.

[0051] Next, the effects of the personal air-conditioning system 1 according to the present invention will be described, which were verified by a simulation using computational fluid dynamics (CFD).

[0052] As shown in Figure 7, a model (conventional example) in which the angle of the wind direction adjustment plate is simply changed using only a rotating shaft, and a model (present invention) of the wind direction adjustment mechanism according to the present invention were reproduced using CFD, and their behaviors were compared.

[0053] The results are shown in Figs. 8 to 12 for each angle φ of the (first) airflow direction adjustment plate with respect to the floor surface (horizontal plane). φ was set to five patterns from 0 to 56° in increments of 14°. The dimensions of the task space 5 defined by the booth wall 20 are 1700 x 1700 mm inside and 2000 mm high. The dimensions of the blow-out slit 10 (blow-out port) are 600 x 30 mm. The dimensions of the (first) airflow direction adjustment plate are 800 x 50 mm. The dimensions of the second airflow direction adjustment plate are 800 x 25 mm. The dimensions of the gap 28 (distance χ) are 10 mm. The users in a chair position shown in the contour diagrams of the analysis results shown in Figs. 8 to 12 are shown for reference of the airflow supply position, and are not reproduced in the model.

[0054] In the pattern with a small φ, there is not much difference between the two, but at φ=42°, the airflow hits the upper part of the user more in the (a) conventional example than in the (b) present invention, and at φ=56°, in the (a) conventional example, the airflow that hits the airflow adjustment plate does not bend much and escapes to the top of the booth without hitting the user. Therefore, in the (a) conventional example, in order to realize the supply of airflow to the back to the head, more detailed angle control is required in the φ>42° region. Considering other factors such as variations during construction, there is a possibility that the airflow adjustment plate itself may have an angle difference of several degrees, so if fine control in units of several degrees is required, there is a concern that the airflow of the intended trajectory cannot be formed. In that respect, by taking the measures shown in (b), the angle control can be made rough in a good sense. Therefore, the present invention not only makes it possible to finely adjust the trajectory of the airflow even in the area with a large φ, but also makes it possible to reduce the influence of differences in the angle of the airflow adjustment plate that occur during construction or long-term use on the trajectory of the airflow thereafter.

[0055] Next, the idea behind setting each parameter in the personal air conditioning system 1 according to the present invention will be explained. For simplicity, however, it is assumed that the rotation axis 31 is at the end of the first airflow direction adjustment plate 30. The parameters listed below are illustrated in FIG. 15. Please note that the following explanation uses x and y that are different from the xyz coordinate system explained above. l1: Width of first airflow adjustment plate l2: Width of second air deflector b: Width of the blowing slit χ: Gap between the first airflow adjustment plate and the booth wall (changes with the angle of the first airflow adjustment plate depending on the position of the rotation axis) y H1 : Installation height of the first airflow direction adjustment plate (the distance between the first airflow direction adjustment plate and the floor surface at φ=0, or the distance between the floor surface and the rotation axis) y H2 : Distance between the pivot shaft and the second airflow adjustment plate φ: Angle between the first airflow adjustment plate and the floor x: Distance from the booth wall y: Distance from the floor As described in Patent Document 2, in this system, in order to prevent the Coanda effect from occurring between the airflow after it collides with the (first) airflow adjustment plate and the floor surface, the height y of the first airflow adjustment plate from the floor surface is set to 0.1 mm. H1 It is desirable to keep them apart by at least 150 mm.

[0056] On the other hand, if the position of the first airflow adjustment plate is too high, even if the first airflow adjustment plate is made horizontal to the floor surface, the airflow cannot be directed to the feet of the user. This is contrary to the effect of the present system, which is to supply airflow from the feet to the head of the user. H1 is naturally limited to about 150 to 200 mm. If the width b of the blowing slit is too wide, the width of the wall jet will increase, and the first airflow direction adjustment plate will not be able to receive the wall jet (described later). On the other hand, if b is too narrow, the resistance of the blowing slit will increase, raising concerns about an increase in the transport power required by the fan (not shown) and noise generation. Therefore, it is desirable for b to be about 20 to 30 mm.

[0057] Furthermore, in order to send airflow to the feet, when φ=0, the first airflow control vane must receive most of the momentum of the wall jet. Specifically, from the wall surface to the end of the jet, about 90% of the momentum in terms of cumulative distribution must be received by the first airflow control vane. The non-dimensional wind speed profile of a two-dimensional wall jet according to existing knowledge from Verhoff (Equation (1) below, Reference 1) is as shown in Figure 13(a), and the profile of the non-dimensional momentum obtained from this distribution is shown in Figure 13(b). Furthermore, if Figure 13(b) is expressed as a cumulative distribution, it becomes Figure 14.

[0058]

number

[0059] In both graphs, the horizontal axis is the half-width b of the wall jet. 0.5 This is the dimensionless distance obtained by dividing the distance x from the wall by x / b. Therefore, from Figure 14, 90% is x / b 0.5is approximately 1.02 (● in the figure), and therefore it is sufficient for the first air direction adjustment plate to extend beyond the booth wall to approximately half the width.

[0060] In other words, χ+l1 is 1.02b 0.5 Here, the momentum of the wall jet passing through the gap χ cannot be received by the first airflow direction adjustment vane, so if the momentum passing through the gap is too large, the first airflow direction adjustment vane will not be able to exert its effect of controlling the airflow direction. This issue will be discussed when discussing the limitations of the gap χ.

[0061] It is known that the half-width formula can generally be expressed in the form of the following formula (2) (Reference 1). This does not depend on the shape of the jet (free jet, wall jet, etc.), but the coefficients α and β are different, and in the case of a two-dimensional wall jet, it is known that α = 0.068 and β = 10b (Reference 1).

[0062] However, because the jet of air blown out of an actual air conditioning outlet does not behave in such an ideal manner, these coefficients depend on the characteristics of each outlet. For the mock-up outlet prototyped in Patent Document 2, α = 0.176 and β = 129. Based on this, 1.02b 0.5 = 50.09, and it is sufficient if χ + l1 is approximately 50 mm or more.

[0063]

number

[0064] On the other hand, if χ+l1 is too large, the space inside the booth will become narrow. In order to prevent damage due to contact with the user, χ+l1 is thought to have an upper limit of around 60 mm. If χ is too narrow, resistance will increase and the airflow will not escape and reach the second airflow adjustment plate, so a gap of around 5 to 10 mm is necessary. On the other hand, as mentioned above, if χ is too wide, much of the momentum of the wall jet will pass through the gap and not hit the first airflow adjustment plate, but will only collide with the second airflow adjustment plate, and the effect of adjusting the airflow direction of the first airflow adjustment plate will not be realized.

[0065] Therefore, the momentum passing through this gap should be kept at most half of the total momentum of the wall jet. From Figure 14, the moment when the momentum of the wall jet reaches 50% in total is x / b 0.5 is approximately 0.412 (▲ in the figure), and therefore the gap χ<0.412×α(y H1 In the mock-up air outlet (air outlet slit) prototyped in the embodiment of Patent Document 2, the first adjustment plate is set at y = y H1 If the distance is set at 150 mm, then χ<20.2 mm.

[0066] Based on the above, the conditions can be summarized as follows. b=20~30 y H1 =150~200 χ+l1<50~60 50 <l1 5<χ<20.2 From this, it is considered appropriate to set χ at approximately 5 to 10 mm and l1 at approximately 50 mm.

[0067] The second airflow direction adjustment plate is required to change the trajectory of the wall jet that passes through the gap and collides with the floor surface as horizontally as possible. Therefore, just like the first airflow direction adjustment plate, it needs to receive most of the momentum of the wall jet that passes through the gap. If we consider the gap between the first airflow direction adjustment plate and the booth wall surface as another blowing slit, the second airflow direction adjustment plate needs to receive more than 90% of the momentum of the wall jet (B2) that blows out from this gap (see Figure 16(a)).

[0068] Therefore, the requirement for l2 is that it be equal to or greater than B2, which is calculated by the following formula (3). Here, α2 and β2 are constants related to the linear expression for the half-width of the wall jet formed through the gap. Regarding α2 and β2, since the long side of the gap χ (length of the first airflow direction adjustment plate from the paper surface, 800 mm in the mockup prototyped in Patent Document 2) is sufficiently long, it is considered to be a two-dimensional wall jet, and if the existing formula for the half-width of a two-dimensional wall jet is used, then α2 = 0.068 and β2 = 10χ. Therefore, the condition for l2 is the following formula (4). For example, when χ = 10, y H2 = 60, then l2 needs to be 11.1 mm or more. Also, since it is probably not desirable for the second airflow direction adjustment plate to protrude further than the first airflow direction adjustment plate at φ = 0, the condition becomes l2 < χ + l1.

[0069]

number

[0070]

number

[0071] In addition, in the situation shown in Figure 16(b), the airflow needs to escape through the gap χ', so y H2 is preferably a little larger than l1. Also, in a situation where the angle φ of the first airflow direction adjustment plate is large, it is preferable that the upper end of the first airflow direction adjustment plate is lower than the upper end of the second airflow direction adjustment plate. Therefore, as shown in FIG. 16(c), if the margin of this space is δ, then l1 + δ <y H2 It is necessary that δ is about 10 mm. Also, because the air current that collides with the second airflow adjustment vane flows as shown in Figure 17, from the viewpoint of being able to direct the air current to the feet, it is better for the height of the second airflow adjustment vane to be as low as possible. Also, in the sense that the air current that hits the second airflow adjustment vane collides with the first airflow adjustment vane and corrects the trajectory of the air current that flows in, it is better for the two to be close to each other. From this, yH2 is calculated as "l1 + δ <y H2 From the above, the wall jet blown out from the gap χ is moved to the distance y H2The width l2 of the second air direction adjustment plate required to receive all at a separated position is 20 mm or more based on Equation (4).

[0072] Summarizing all of the above, the following conditions are considered optimal in this system from the viewpoints of "supplying an air current from the feet to the head", "making a system with easy fine adjustment of the air direction", "utilizing without narrowing the space", "not increasing the pressure loss at the air outlet", etc. Condition (1) y H1 = 150 to 200 mm: Refer to the study of Patent Document 2. Condition (2) b = 20 to 30 mm: If it is too narrow, the resistance will increase; if it is too wide, the jet flow will spread and cannot be received completely. Condition (3) 1.02×α(y H1 +β)mm < χ + l1 < 60 mm Left side: Receive more than 90% of the momentum of the wall jet flow (when φ = 0), Right side: Do not narrow the space inside the booth. Condition (4) l1 > 40 to 50 mm (depending on Conditions (3) and (5)): Receive more than 40% of the momentum of the wall jet flow (when φ = 0). Condition (5) 5 mm < χ < 0.412×α(y H1 +β)mm Left side: The air current passes through the gap, Right side: Make the momentum passing through the gap of the wall jet flow less than half. Condition (6) l1 + δ < y H2 and as small as possible: When the angle φ of the first air direction adjustment plate is close to 90°, it can be stored under the second air direction adjustment plate, and a gap is formed through which the air current whose trajectory is changed by the second air direction adjustment plate can pass. δ is about 10 mm. Condition (7) 1.02×0.068(y H2 + 10χ)mm < l2 < χ + l1 Left side: Receive more than 90% of the momentum of the wall jet flow with the second air direction adjustment plate, Right side: Be less than or equal to the protruding amount (χ + l1) of the first air direction adjustment plate.

[0073] Using the characteristics of the wall jet flow blown out from the air outlet of the mock-up prototyped in Patent Document 2, if the jet flow after passing through the gap χ is regarded as an ideal two-dimensional wall jet flow, it is as follows. Here, Condition (1) sets y H1 = 150. Condition (1) y H1 =150mm Condition (2) b=20~30mm Condition (3) 50.09 <χ+l1<60mm Condition (4) l1>40~55mm (depending on conditions (3) and (5)) Condition (5) 5mm<χ<20.2mm Condition (6) y H2 =60~70mm Condition (7) 11.1mm <l2<60mm However, the scope of application can be expanded by relaxing the above constraints. For example, if it is not necessary to supply airflow to the feet of the user, H1 It is also possible to raise the value of the first airflow direction adjusting plate width l1 and relax other parameters accordingly. In addition, if it is acceptable for the space to be somewhat narrower, the value of the first airflow direction adjusting plate width l1 can be increased, which increases the area that can receive the wall jet, and therefore the outlet width b and the gap χ can also be widened, etc., and the conditions can be relaxed in this way. References: Shakochi, T.: Jet flow engineering, Morikita Publishing Co., Ltd., 2004 (in Japanese) Toshihiko Yagouchi: Jet Engineering, Morikita Publishing, 2004 As described above, the personal air conditioning system according to the present invention is composed of two airflow direction adjustment plates, a first airflow direction adjustment plate that is attached to the booth wall in an adjustable position and hits the air blown out from the blowing slit, and a second airflow direction adjustment plate that is attached to the booth wall and hits the air blown out from the blowing slit through between the first airflow direction adjustment plate and the booth wall, and it is possible to guide a composite jet of a jet that collides with the first airflow direction adjustment plate and a jet that collides with the second airflow direction adjustment plate disposed downstream of the first airflow direction adjustment plate to a task space. According to such a personal air conditioning system according to the present invention, as the adjustment angle (φ) of the first airflow direction adjustment plate increases, the influence of the jet formed by the second airflow direction adjustment plate increases, so that it becomes easy to control the direction of the airflow by changing the adjustment angle (φ) of the first airflow direction adjustment plate, and it is also possible to fine-tune the trajectory of the airflow.

[0074] Next, another embodiment of the present invention will be described. According to the personal air-conditioning system 1 according to the embodiment described above, it is possible to supply airflow to various parts by changing the angle of the first airflow adjustment plate 30, but on the other hand, it is impossible to meet the needs of an office worker M who wants to lower the temperature in the space but does not want to be exposed to the airflow.

[0075] Furthermore, ventilation has recently become important in terms of preventing the spread of infectious diseases, and it is necessary to consider a method of using the personal air conditioning system 1 to ventilate the task space 5 surrounded by booth walls without affecting the sensation of warmth and cold.

[0076] Therefore, in this embodiment, by changing the shape of the first airflow direction adjustment plate 30, it is possible to ventilate the task space 5 without directing conditioned air at the worker M, and it is also possible to adjust the direction of the airflow as in the previous embodiments.

[0077] FIG. 19 is a diagram showing a first airflow direction adjustment plate 30 used in a personal air conditioning system 1 according to another embodiment of the present invention. In another embodiment, the first airflow direction adjustment plate 30 may have an L-shaped cross section cut in a direction perpendicular to the longitudinal direction (x direction) of the air outlet slit 10. A commonly available right-angled member may be used as the first airflow direction adjustment plate 30, but it is not necessarily required to be a member in which two plates are connected at a right angle, as in a right-angled angle, and it is sufficient if the two plates are connected so that their extending directions (extend) intersect at a predetermined angle. In the following embodiment, a right-angled member in which two plates are connected at a right angle will be described as an example.

[0078] The first airflow direction adjustment plate 30 may be composed of a first plate portion 110 and a second plate portion 120 having a main surface that forms a predetermined angle (90° in this embodiment) with the main surface of the first plate portion 110 and that continues from the first plate portion 110 via a boundary portion 119.

[0079] The first airflow direction adjustment plate 30 is configured so that the longitudinal direction of the first plate portion 110 and the longitudinal direction of the second plate portion 120 intersect when viewed in a cross section perpendicular to the axial direction of the rotation shaft.

[0080] The first plate portion 110 has, as its main surfaces, a first plate portion first main surface 111 and a first plate portion second main surface 112 opposing the first plate portion first main surface 111. The first plate portion first main surface 111 and the first plate portion second main surface 112 are in a front-back relationship and are parallel to each other. Similarly, the second plate portion 120 has, as its main surfaces, a second plate portion first main surface 121 and a second plate portion second main surface 122 opposing the second plate portion first main surface 121. The second plate portion first main surface 121 and the second plate portion second main surface 122 are in a front-back relationship and are parallel to each other. The thickness of the first plate portion 110 (the distance between the first plate portion first main surface 111 and the first plate portion second main surface 112) and the thickness of the second plate portion 120 (the distance between the second plate portion first main surface 121 and the second plate portion second main surface 122) are expected to be approximately 1 mm.

[0081] Here, the first plate portion 110 farthest from the boundary portion 119 is defined as the first end portion (first plate portion end portion 115), and the second plate portion 120 farthest from the boundary portion 119 is defined as the second end portion (second plate portion end portion 125). The first airflow direction adjustment plate 30 has a shape and dimensions such that, when the angle φ is a predetermined size, the first plate portion end portion 115 of the first plate portion 110 abuts on the floor surface, and at the same time, the second plate portion end portion 125 of the second plate portion 120 abuts on the booth wall 20a. In addition, when the first airflow direction adjustment plate 30 is viewed in a cross section cut in a direction perpendicular to the longitudinal direction of the blow-out slit 10, the length of the first plate portion 110 is longer than that of the second plate portion 120. In other words, when the length a1 from the rotation center of the rotating shaft 31 to the first plate end 115 in the extension direction of the first plate 110 is taken as the length a2 from the rotation center of the rotating shaft 31 to the second plate end 125 in the extension direction of the second plate 120, there is a relationship of a1>a2. (When viewed in a cross-sectional view perpendicular to the axial direction of the rotating shaft, the length of the first airflow direction adjustment plate 30 in the longitudinal direction of the first plate 110 is longer than the length of the second plate 120 in the longitudinal direction.) According to the first airflow direction adjusting plate 30 as described above, by setting the first airflow direction adjusting plate 30 at an angle φ, the path of the airflow that tries to flow vertically upward from the air outlet slit 10 can be blocked, and the air outlet direction can be controlled. By blocking the path of the vertical airflow in this way, the conditioned air from the air outlet slit 10 flows along the adjusting plate in the front-to-back direction of the page, flows toward the booth wall 20a without hitting the worker M, and then flows along the booth wall 20a, and is supplied to the vicinity of the floor surface around the worker M. This allows for effective ventilation without hitting the worker M with the airflow in a manner similar to displacement ventilation.

[0082] In the previous embodiment, the wind direction was made easier to adjust by providing a gap 28 between the end of the first airflow direction adjustment plate 30 facing the booth wall and the booth wall. However, with such a configuration, even if the first airflow direction adjustment plate 30 is swung down and the angle φ is increased, the resulting gap 28 will cause airflow to leak upwards.

[0083] Therefore, in the first airflow adjustment plate 30 of this embodiment, in order to prevent this and to supply airflow to the worker M side as before, an angle-shaped member is used for the first airflow adjustment plate 30 so that the gap 28 between the booth wall surface and the first airflow adjustment plate 30 is sufficiently opened to obtain the effect of the previous embodiment, and the first airflow adjustment plate 30 is swung down to an angle φ as shown in Figure 20 to close the gap 28.

[0084] The relationship between the lengths at the time of design is shown below using schematic diagrams (Figs. 20 and 21). The angle used as the first airflow direction adjustment plate 30 can be a generally available right-angled L-shaped angle. The length of the first plate portion 110 (long side) of the angle as the first airflow direction adjustment plate 30 is a1, the length of the second plate portion 120 (short side) is a2, the length of the width (short side) of the blow-out slit 10 is b, the distance between the center of the rotation shaft 31 of the first airflow direction adjustment plate 30 and the booth wall surface 20a is c, the distance between the center of the rotation shaft 31 and the floor surface (blow-out slit 10) is d, and the member used as the rotation shaft 31 is regarded as a cylinder with its radius r.

[0085] Here, a1 and a2 are the distances between "the intersection of a perpendicular line dropped from the center of the pivot shaft to the first plate portion 110 and the second plate portion 120 of the first airflow direction adjustment plate 30 and the first plate portion 110 and the second plate portion 120" and "the first plate portion 110 and the second plate portion 120 of the first airflow direction adjustment plate 30." Also, the thickness of the member forming the angle of the first airflow direction adjustment plate 30 is ignored.

[0086] Under these conditions, the length a1 of the long side and the length a2 of the short side of the angle of the first airflow direction adjustment plate 30 are calculated by the following formulas (5) and (6), respectively. For reference, the relationship between the distance d and a1 and a2 due to differences in the width b of the air outlet slit 10 is shown in FIG.

[0087]

number

[0088]

number

[0089] Furthermore, φ has the following relationship among parameters other than a1 and a2.

[0090]

number

[0091] By solving equation (7), φ can be obtained using the following equation (8).

[0092]

number

[0093] In order for the first airflow direction adjustment plate 30 to function, the following conditions must be met. Condition (1)b>(c+r) The width b of the blowing slit is greater than the distance (c+r) from the booth wall to the outside of the rotation axis. Condition (2) d>r The distance d from the floor to the axis of rotation is greater than the radius r of the axis of rotation. Condition (3) d>a2 The distance d from the floor to the axis is greater than the length a2 of the short side of the L-shaped angle. Condition (4)c>r The distance c from the wall to the axis is greater than the radius r of the pivot axis.

[0094] The effects of the personal air-conditioning system 1 according to this embodiment, which uses the first airflow direction adjustment plate 30 whose parameters have been set as described above, will be described.

[0095] Fig. 23 is a diagram showing an example of angle adjustment of the first airflow direction adjustment plate 30, and Fig. 24 is an image diagram showing the airflow caused by angle adjustment of the first airflow direction adjustment plate 30. The position of the first airflow direction adjustment plate 30 shown in Fig. 23(a) shows a case where the angle φ of the first airflow direction adjustment plate 30 is set to be greater than 0°. At this time, as shown in Fig. 24(a), the temperature-adjusted airflow hits the trunk of the worker M.

[0096] 23(b) shows the position of the first airflow direction adjustment plate 30 when the angle φ of the first airflow direction adjustment plate 30 is set to approximately 0°. At this time, the temperature-adjusted airflow hits the feet of the worker M, as shown in FIG. 24(b).

[0097] 23(c) shows the position of the first airflow direction adjustment plate 30 when the angle φ of the first airflow direction adjustment plate 30 is less than 0° and the first airflow direction adjustment plate 30 is in contact with both the booth wall and floor surfaces, blocking the path of the airflow attempting to flow vertically from the outlet slits 10. At this time, as shown in FIG. 24(c), for the purpose of ventilation, the temperature-adjusted airflow can be made to crawl along the floor without being directed at the worker M.

[0098] According to the other embodiment of the present invention as described above, it is possible to enjoy the same effects as the previous embodiment, and in cases where the worker M does not want to be directly exposed to the temperature-conditioned airflow, the first airflow direction adjustment plate 30 can be used to block the path of the airflow flowing vertically upward from the outlet slit 10, thereby preventing the airflow from being directed directly at the worker M, and further enabling ventilation within the task space 5 surrounded by the booth wall 20. [Explanation of symbols]

[0099] 1. Personal air conditioning system 5. Task space 10. Exhaust slit 20, 20a, 20b, 20c, 20d... Booth walls 23. Open ceiling space 28. Gap (distance of gap from booth wall: χ) (wind direction adjustment mechanism) 30...1st wind direction adjustment plate (wind direction adjustment mechanism) 31... Rotating shaft (wind direction adjustment mechanism) 40...Second wind direction adjustment plate (wind direction adjustment mechanism) 42...Vertical side plate 45···Bearing 50··Desk 52 Table 53 Personal Computer 54...Operation instruction section 55...Lighting 60···Floorboard 110...1st plate part 111: First plate portion, first main surface 112... First plate portion second main surface 115...1st plate end 119...Border 120...Second plate part 121... Second plate portion first main surface 122... Second plate portion second main surface 125...2nd plate end M...Officer

Claims

1. A personal air conditioning system that conditions a task space enclosed by vertically installed booth walls, A blow-out slit having a longitudinal direction along an installation portion of the booth wall and blowing out temperature-adjusted air vertically upward; A personal air conditioning system comprising: a first airflow direction adjustment plate attached to the booth wall in an adjustable position and against which the air blown out of the outlet slit hits; and a second airflow direction adjustment plate attached to the booth wall and against which the air blown out of the outlet slit hits between the first airflow direction adjustment plate and the booth wall.

2. A rotation axis having an axis center parallel to the longitudinal direction of the blowing slit, The first airflow direction adjustment plate is attached to the rotating shaft, and when the rotating shaft rotates, 2. The personal air-conditioning system according to claim 1, wherein the first airflow direction adjusting plate adjusts the airflow direction of the air blown out from the blowing slit.

3. 3. The personal air conditioning system according to claim 2, wherein the first airflow direction adjustment plate is attached to the rotating shaft at an end of the first airflow direction adjustment plate.

4. The personal air conditioning system according to claim 2, characterized in that the first air direction adjustment plate is configured to extend not only in one direction but also in the other direction in a predetermined direction perpendicular to the axial direction of the rotating shaft when the rotating shaft is used as a reference.

5. The second airflow direction adjustment plate is Two vertical side plates extending vertically downward from both ends perpendicular to the longitudinal direction of the blowing slit; two bearings provided on each of the vertical side plates; 5. The personal air conditioning system according to claim 2, wherein the rotating shaft is disposed between the bearings.

6. The first airflow direction adjustment plate has a first plate portion extending in an axial direction of the rotation shaft and a second plate portion connected to the first plate portion via a boundary portion, A personal air conditioning system as described in any one of claims 2 to 5, characterized in that in a cross-sectional view perpendicular to the axial direction of the rotating shaft, the longitudinal direction of the first plate portion and the longitudinal direction of the second plate portion are configured to intersect.

7. 7. The personal air conditioning system according to claim 6, wherein in a cross-sectional view perpendicular to the axial direction of the rotating shaft, the length of the first plate portion in the longitudinal direction is longer than the length of the second plate portion in the longitudinal direction.

8. When an end portion of the first plate portion farthest from the boundary portion between the first plate portion and the second plate portion abuts against a floor surface, 8. The personal air conditioning system according to claim 6, wherein an end of the second plate portion which is farthest from the boundary between the first plate portion and the second plate portion abuts against a booth wall.

Images