Air outlet unit

Abstract

In displacement air conditioning for a target space, the present invention provides a discharge unit that suppresses the deterioration of cleanliness in the lower part of the target space. [Solution] The blowing unit comprises a box section (11) positioned in the ceiling space of the target space (S), and a nozzle section (20) positioned below the box section (11) and blowing air from inside the box section (11) downward into the target space (S). The nozzle section (20) has a cylindrical section (24) formed so that the opening area expands from top to bottom, an expanding pipe section (26) positioned inside the cylindrical section (24) and forming an annular airflow channel (P1~P4) that expands radially outward from the cylindrical section (24) from top to bottom, and a straightening section (27) provided below the cylindrical section (24) and straightening the air flowing through the cylindrical section (24) in the direction of the cylindrical axis.

Description

Technical Field

[0001] The present disclosure relates to a blowing unit.

Background Art

[0002] The displacement air conditioning method disclosed in Patent Document 1 forms a temperature layer due to a density difference caused by air temperature by supplying fresh air from the ceiling of the target space toward the floor. Thereby, only the lower part of the target space is air-conditioned.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a displacement air conditioning method, the fresh air blown out from the ceiling of the target space may be conveyed to the floor surface while entraining the air in the target space. When the fresh air is entrained in the air of the target space, it is impossible to deliver highly clean air to the lower part of the target space, and the cleanliness of the lower part of the target space deteriorates.

[0005] An object of the present disclosure is to provide a blowing unit that suppresses deterioration of the cleanliness of the lower part of a target space in displacement air conditioning of the target space.

Means for Solving the Problems

[0006] The first aspect is a blowing unit for performing displacement air conditioning to maintain a target area (R) formed from the floor surface to a predetermined height in a predetermined environment at the lower part of a target space (S) to be air-conditioned, a box part (11) disposed above the target space (S), The box portion (11) is positioned below the nozzle portion (20) which blows air from inside the box portion (11) downward into the target space (S), A connection hole (13) is provided on the side of the box section (11) to which the outlet end of the air transport duct (52) is connected. The nozzle portion (20) is A cylindrical section (24) formed such that the opening area increases from top to bottom, An expanded pipe section (26) is positioned inside the cylindrical section (24) and forms an annular air passage (P1~P4) that widens radially outward from the cylindrical section (24) as it extends from top to bottom, The device includes a flow straightening section (27) located below the cylindrical section (24) that straightens the air flowing through the cylindrical section (24) in the direction of the cylindrical axis.

[0007] In the first embodiment, by using the box section (11), the air outlet unit (10) can be easily installed even if the space above the target space (S), such as the space above the ceiling, is relatively narrow. If the box section (11) is not used, it would be necessary to bend the horizontally extending duct (52) at a right angle toward the nozzle section (20), but the air outlet unit (10) of this disclosure eliminates the need for such processing.

[0008] In addition, the expanded section (26) forms an annular airflow channel (P1~P4) within the cylindrical section (24) that extends radially outward from top to bottom. As a result, the air flowing from top to bottom within the cylindrical section (24) diffuses and can be blown out from the entire opening area at the lower end of the cylindrical section (24).

[0009] In addition, the air flowing through the cylindrical section (24) is straightened by the rectifier section (27), which promotes the air blown out from the nozzle section (20) to move straight down and suppresses it from spreading laterally. As a result, the air blown out from the nozzle section (20) is prevented from descending while entraining the air of the indoor space (S), thus preventing it from mixing with the air of the target space (S) in the target area (R). In this way, the target area (R) at the bottom of the target space (S) can be kept filled with fresh air, and the air purity can be increased.

[0010] A second aspect is, in the first aspect, In the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis, the upper part of the air passage (P1 to P4) is formed in a straight line.

[0011] In the second embodiment, the upper part of the air passage (P1 to P4) is formed in a straight line at the cross-section. This allows air to be blown out from the entire opening area at the lower end of the nozzle (20) more effectively than when the upper part of the air passage (P1 to P4) is formed to curve outward in the radial direction, for example.

[0012] A third aspect is a manifestation of the first or second aspect, The aforementioned air passages (P1 to P4) are arranged radially in multiple locations on the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis. The width of each of the air passages (P2 to P4) formed within the expanded pipe section (26) is the same.

[0013] In the third embodiment, the air flowing into the expanded section (26) is evenly distributed to each of the multiple annular air passages (P2 to P4) formed within the expanded section (26). This is because variations in pressure loss within each of the multiple annular air passages (P2 to P4) formed within the expanded section (26) are suppressed.

[0014] The fourth aspect is one of the first to third aspects, In the cross-sectional view obtained by cutting the cylindrical portion (24) in the axial direction of the cylinder, the cylindrical portion (24) has a portion that smoothly curves from top to bottom, and a first angle between the tangent line at the upper end of the cylindrical portion (24) and the horizontal line is smaller than a second angle between the tangent line at the lower end of the cylindrical portion (24) and the horizontal line.

[0015] In the fourth aspect, by providing the first angle and the second angle on the inner wall of the cylindrical portion (24), the air flow can be adjusted, and as a result, uniform dispersion of air can be promoted.

[0016] The fifth aspect is any one of the first to fourth aspects, the diffuser portion (26) has four or more diffusers (26a, 26b, 26c, 26d), and is configured such that another diffuser (26b, 26c, 26d) is disposed inside one diffuser (26a, 26b, 26c).

[0017] In the fifth aspect, annular air flow paths (P1 to P4) are formed between adjacent diffusers (26a, 26b, 26c, 26d) in the radial direction. By forming a plurality of such air flow paths (P1 to P4), the air flowing from above to below in the cylindrical portion (24) can be easily diffused within the cylindrical portion (24).

[0018] The sixth aspect is any one of the first to fifth aspects, further includes a cylindrical extension portion (29) extending in the vertical direction, the extension portion (29) is provided below the rectifying portion (27) and guides the air flowing out from the rectifying portion (27) downward.

[0019] In the sixth aspect, by allowing the air rectified by the rectifying portion (27) to pass through the extension portion (29), it is possible to generate a downward airflow that descends toward the floor surface without diffusing around the nozzle portion (20). Thereby, it is possible to prevent the air blown out from the nozzle portion (20) from entraining the air in the target space (S), and the cleanliness of the lower part of the target space (S) can be increased.

[0020] The seventh aspect is any one of the first to sixth aspects, further includes a guide portion (12) disposed inside the box portion (11) for guiding a part of the air flowing into the box portion (11) through the connection hole (13) to the nozzle portion (20).

[0021] In the seventh aspect, a part of the air flowing into the box portion (11) from the connection hole (13) is guided by the guide portion (12) and flows into the nozzle portion (20). In this way, it is possible to suppress all of the air flowing into the box portion (11) from the connection hole (13) from reaching the side wall facing the connection hole (13), and the air can be uniformly circulated throughout the entire opening region forming the inlet of the cylindrical portion (24).

[0022] The eighth aspect is any one of the first to seventh aspects, the rectifying portion (27) has a honeycomb structure.

[0023] In the eighth aspect, the honeycomb structure can improve the air rectifying effect by the rectifying portion (27).

Brief Description of the Drawings

[0024] [Figure 1] FIG. 1 is a diagram schematically showing an indoor space in which the air conditioner of the embodiment is provided. [Figure 2] FIG. 2 is a longitudinal sectional view showing the configuration of the blowing unit of the embodiment. [Figure 3] [[ID=​​​​​​​ [Figure 6] Figure 6 shows the airflow and wind speed of the discharge unit of comparison unit 2. Figure 6(a) is the analysis result showing the direction of airflow within the discharge unit. Figure 6(b) is the analysis result showing the wind speed distribution viewed from below the cylindrical part of the discharge unit. Lighter colors indicate higher wind speeds. [Figure 7] Figure 7 shows the airflow and wind speed of the discharge unit in this embodiment. Figure 7(a) is an analysis result showing the direction of airflow within the discharge unit. Figure 7(b) is an analysis result showing the wind speed distribution viewed from below the cylindrical part of the discharge unit. Lighter colors indicate higher wind speeds. [Figure 8] Figure 8 is a longitudinal cross-sectional view showing the configuration of the discharge unit in another embodiment. [Modes for carrying out the invention]

[0025] Embodiments of the present invention will be described below with reference to the drawings. The following embodiments are essentially preferred examples and are not intended to limit the scope of the present invention, its applications, or its uses. Furthermore, the embodiments, modifications, and other examples described below can be combined or partially replaced to the extent that the present invention is implementable.

[0026] (1) Air conditioning system As shown in Figure 1, the air outlet unit (10) of this embodiment is applied to an air conditioning system (1). The air conditioning system (1) provides air conditioning to an indoor space (S), such as an office or conference room. The indoor space (S) is an example of a target space (S). The air conditioning method of this embodiment is displacement air conditioning. Displacement air conditioning maintains a target area (R) formed from the floor surface of the room up to a predetermined height in a predetermined environment.

[0027] The specified height only needs to be lower than the ceiling of the room. Specifically, it may be 3 / 4 or less of the height from the floor to the ceiling, 2 / 3 or less, or 1 / 2 or less.

[0028] The specified environment refers to a state in which the air in the target area (R) is replaced by air treated by the air conditioning device (1) (hereinafter also referred to as the treated air), and the treated air is not mixed with the air in the target area (R), or a state in which, in the indoor space (S), a layer of treated air formed in the target area (R) and a layer of air above the target area (R) are formed. The layers may be layers of air with different temperatures or layers of air with different levels of cleanliness.

[0029] As shown in Figures 1 and 2, the air conditioning system (1) includes an air conditioning unit (30) and a discharge unit (10).

[0030] (1-1) Air conditioning unit The air conditioning unit (30) is a device that processes incoming outside air (OA) and transports the processed air toward the target space (S). The air conditioning unit (30) is located outside the target space (S). For example, the air conditioning unit (30) is located in the ceiling space. The air conditioning unit (30) has an air processing unit (40), a first duct (51), and a second duct (52).

[0031] The first duct (51) is a duct that transports outside air to the air processing unit (40). One end of the first duct (51) is in communication with the outside, and the other end is in communication with the air processing unit (40).

[0032] The air processing unit (40) comprises a casing (41), a fan (42), and an evaporator (43). The casing (41) houses the fan (42) and the evaporator (43). The casing (41) has connection holes for connecting a first duct (51) and a second duct (52). The casing (41) has an air passage through which air flows from the first duct (51) to the second duct (52). The fan (42) transports the air inside the casing (41). The transported air flows out to the target space (S) via the second duct (52). The evaporator (43) is positioned in the air passage inside the casing (41). The evaporator (43) is connected to a predetermined refrigerant circuit (not shown). The refrigerant circuit has a compressor, an expansion mechanism, and a heat exchanger, and performs a vapor compression type refrigeration cycle.

[0033] The second duct (52) transports the air processed in the air processing unit (40) to the nozzle unit (20), which will be described later. The second duct (52) is located in the ceiling space. One end of the second duct (52) is connected to the air processing unit (40), and the other end is connected to the discharge unit (10). The second duct (52) corresponds to the duct (52) of this disclosure.

[0034] (1-2) Discharge Unit The discharge unit (10) of this embodiment has a box section (11) and a nozzle section (20).

[0035] The box section (11) is formed in a box shape. The box section (11) is positioned above the interior space (S). In this embodiment, the box section (11) is positioned in the space above the ceiling of the interior space (S). The box section (11) is provided with a first connection hole (13) and a second connection hole (15). The first connection hole (13) is formed on the first side surface (17), which is the side surface of the box section (11). The first connection hole (13) is the connection hole of this disclosure to which the outlet end of the second duct (52) is connected. The second connection hole (15) is formed on the bottom surface of the box section (11). The second connection hole (15) is the hole to which the neck section (22), which will be described later, is connected. In this way, within the box section (11), air flowing in from the side through the first connection hole (13) flows downward toward the second connection hole (15).

[0036] A guide section (12) is positioned inside the box section (11). The guide section (12) guides a portion of the air that flows into the box section (11) from the second duct (52) through the first connection hole (13) to the nozzle section (20). The guide section (12) is a plate-shaped member. The guide section (12) is positioned near the center of the box section (11). The guide section (12) is positioned so that its plate surface faces the first connection hole (13). The guide section (12) is positioned above the second connection hole (15). Specifically, the guide section (12) is positioned directly above the second connection hole (15).

[0037] The nozzle section (20) constitutes an outlet that blows air straight down toward the target space (S). The nozzle section (20) is positioned below the box section (11). Inside the nozzle section (20), air flows downward from the second connection hole (15). The nozzle section (20) has a neck section (22), a cylindrical section (24), an expanding section (26), a flow straightening section (27), and an extension section (29).

[0038] The neck portion (22) is a cylindrical member that extends vertically. The upper end of the neck portion (22) is connected to the second connection hole (15).

[0039] The cylindrical portion (24) is connected to the lower end of the neck portion (22) and is a cylindrical member that extends downward from the lower end of the neck portion (22). The cylindrical portion (24) is formed so that the opening area increases from top to bottom. The cylindrical portion (24) shown in Figure 2 is formed in a tapered shape. In the cross-section obtained by cutting the cylindrical portion (24) in the direction of the cylindrical axis, the upper part of the inner wall surface of the cylindrical portion (24) is formed in a straight line.

[0040] The expanded section (26) is positioned inside the cylindrical section (24). The expanded section (26) is a cylindrical member formed in a tapered shape such that the opening area gradually increases from top to bottom. In this embodiment, the expanded section (26) has four expanded tubes (26a, 26b, 26c, 26d). Each of the expanded tubes (26a, 26b, 26c, 26d) is of a different size. The wall thickness of the four expanded tubes (26a, 26b, 26c, 26d) is the same.

[0041] The four expanded tubes (26a, 26b, 26c, 26d) are the first expanded tube (26a), the second expanded tube (26b), the third expanded tube (26c), and the fourth expanded tube (26d). The expanded tube section (26) is configured such that one expanded tube (26b, 26c, 26d) is placed inside another expanded tube (26a, 26b, 26c). Specifically, the expanded tubes (26a, 26b, 26c, 26d) decrease in size in the order of the first expanded tube (26a), the second expanded tube (26b), the third expanded tube (26c), and the fourth expanded tube (26d). The fourth expanded tube (26d) is placed inside the third expanded tube (26c). The third expanded tube (26c) is placed inside the second expanded tube (26b). The second expansion pipe (26b) is positioned inside the first expansion pipe (26a).

[0042] The expanded section (26) forms annular air passages (P1-P4) that expand radially outward from the cylindrical section (24) as they extend from the top to the bottom. Multiple air passages (P1-P4) are arranged radially in the cross-section obtained by cutting the expanded section (26) in the direction of the cylindrical axis. Specifically, four annular air passages (P1-P4) and one linear air passage (P5) are formed inside the cylindrical section (24). The four annular air passages (P1-P4) are the first air passage (P1), the second air passage (P2), the third air passage (P3), and the fourth air passage (P4). The one linear air passage (P5) is the fifth air passage (P5). The first to fourth air passages (P1-P4) are examples of the air passages (P1-P4) of this disclosure.

[0043] The first air passage (P1) is a passage formed between the inner surface of the cylindrical section (24) and the first expanded pipe (26a). The second air passage (P2) is a passage formed between the first expanded pipe (26a) and the second expanded pipe (26b). The third air passage (P3) is a passage formed between the second expanded pipe (26b) and the third expanded pipe (26c). The fourth air passage (P4) is a passage formed between the third expanded pipe (26c) and the fourth expanded pipe (26d). The fifth air passage (P5) is a passage inside the fourth expanded pipe (26d).

[0044] In the cross-section obtained by cutting the cylindrical portion (24) in the direction of the cylindrical axis, the upper part of the air passage (P1~P4) is formed in a straight line. The upper part of the air passage (P1~P4) means the area above the midpoint between the lower end and the upper end of the air passage (P1~P4). Alternatively, when the distance in the cylindrical axis between the lower end and the upper end of the air passage (P1~P4) is H, the upper part of the air passage (P1~P4) may be the region from H / 3 to H / 5 from the upper end of the air passage (P1~P4).

[0045] The four expanded tubes (26a, 26b, 26c, 26d) are arranged such that the inner wall surface of one expanded tube (26a, 26b, 26c) facing each other radially is approximately parallel to the outer wall surface of the other expanded tube (26b, 26c, 26d). In addition, the first expanded tube (26a) is arranged such that the inner wall surface of the cylindrical section (24) is approximately parallel to the outer wall surface of the first expanded tube (26a). As a result, the air in each of the first air passages (P1) to the fourth air passage (P4) flows parallel to each other.

[0046] The widths of the air passages (P2 to P4) formed within the expanded section (26) are all the same. Specifically, the widths of the second air passage (P2), the third air passage (P3), and the fourth air passage (P4) are all the same. This suppresses variations in pressure loss within each of the air passages from the second air passage (P2) to the fourth air passage (P4), and a portion of the air flowing into the cylindrical section (24) is evenly distributed to each of the air passages from the second air passage (P2) to the fourth air passage (P4).

[0047] The rectifier (27) is provided below the cylindrical portion (24). Specifically, the rectifier (27) is provided at the lower end of the cylindrical portion (24). The rectifier (27) rectifies the air flowing inside the cylindrical portion (24) so ​​that it is directed in the direction of the cylindrical axis. The rectifier (27) is a plate-shaped member having a plurality of holes formed in the thickness direction. The plate thickness of the rectifier (27) is, for example, 20 mm to 40 mm.

[0048] The rectifier section (27) has a honeycomb structure. As shown in the enlarged view of the rectifier section (27) enclosed by the dashed line in Figure 2, the honeycomb structure has multiple core channels whose cross-sectional shape is hexagonal, perpendicular to the direction of the airflow path. The side length of the hexagon of the core channel is 10 mm to 20 mm.

[0049] The extension (29) is a cylindrical member that extends vertically. The extension (29) is provided below the flow straightening section (27). The extension (29) extends downward from the lower end of the cylindrical section (24). The vertical length of the extension (29) is 30 cm to 100 cm. The extension (29) may be positioned below the ceiling surface.

[0050] (2) Explanation of the operation of the air conditioning system When the air conditioning unit (1) starts operation, the refrigeration cycle is executed in the refrigerant circuit and the fan (42) rotates. The outside air drawn into the first duct (51) by the rotation of the fan (42) flows into the air processing unit (40) and is cooled by heat exchange with the refrigerant in the evaporator (43). The air that has been processed (cooled) in this way by the air processing unit (40) is sometimes called the treated air.

[0051] As shown by the arrows in Figure 3, the air to be treated is transported to the second duct (52) and then flows into the box section (11) through the first connection hole (13). The air that flows into the box section (11) flows toward the second side surface (19) opposite the first side surface (17), and then flows downward toward the nozzle section (20). A portion of the air flowing into the box section (11) is guided by the guide section (12) and flows downward toward the nozzle section (20).

[0052] The air flowing into the nozzle section (20) passes through the neck section (22) and then divides into five airflow channels, the first airflow channel (P1) to the fifth airflow channel (P5), within the cylindrical section (24). The divided air spreads throughout the entire opening at the lower end of the cylindrical section (24) and is straightened into a downward flow by the flow straightening section (27). After that, it passes through the extension section (29) and moves downward towards the floor of the indoor space (S).

[0053] (3) Features (3-1) Feature 1 The discharge unit (10) of this embodiment is a discharge unit for performing displacement air conditioning to maintain a predetermined environment in a target area formed below a target space (S) that is to be air-conditioned, from the floor up to a predetermined height. The discharge unit (10) comprises a box section (11) positioned above the ceiling of the target space (S), and a nozzle section (20) positioned below the box section (11) and blowing air from inside the box section (11) downward into the target space (S). A connection hole (13) is provided on the side of the box section (11) to which the outlet end of the second duct (52) for transporting air is connected. The nozzle section (20) has a cylindrical section (24) formed such that the opening area expands from top to bottom, an expanding section (26) positioned inside the cylindrical section (24) and forming an annular airflow channel (P1~P4) that expands radially outward from the cylindrical section (24) from top to bottom, and a straightening section (27) provided below the cylindrical section (24) that straightens the air flowing through the cylindrical section (24) in the direction of the cylindrical axis.

[0054] According to this embodiment, by using the box section (11), the air outlet unit (10) can be easily installed even when the space above the ceiling is relatively narrow. If the box section (11) is not used, it would be necessary to bend the second duct (52) that extends horizontally at a right angle toward the nozzle section (20), but with the air outlet unit (10) of this embodiment, such processing is unnecessary.

[0055] In addition, the expanding tubes (26a, 26b, 26c, 26d) form annular air passages (P1~P4) that extend radially outward from top to bottom within the cylindrical section (24). As a result, the air flowing from top to bottom within the cylindrical section (24) diffuses and can be blown out from the entire opening area at the lower end of the cylindrical section (24).

[0056] In addition, the air flowing through the cylindrical section (24) is straightened by the rectifier section (27), so that the air blown out from the nozzle section (20) moves downward and is prevented from diffusing in the left and right directions. As a result, the air from the nozzle section (20) is prevented from being drawn into the air of the indoor space (S) as it descends, and is prevented from reaching the floor surface mixed with the air of the target space (S). This makes it possible to maintain an environment filled with fresh air in the air-conditioned area targeting the lower part of the indoor space (S), thereby increasing the air purity.

[0057] (3-2) Feature 2 In the discharge unit (10) of this embodiment, the upper part of the air passage (P1~P4) is formed in a straight line at the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis.

[0058] As shown in Figure 4, when the upper part of the expanded pipe section (26) is not formed in a straight line but curves radially outward in a cross-section along the vertical direction of the expanded pipe section (26), it was found that while an airflow blown downward from the cylindrical section (24) is formed, an airflow drawn into the cylindrical section (24) is also generated. On the other hand, as shown in Figure 3, it was found that the shape of the expanded pipe section (26) in this embodiment suppresses the generation of an airflow drawn into the cylindrical section (24). Thus, by forming the upper part of the airflow passage (P1~P4) by the expanded pipe section (26) in this embodiment in a straight line, disturbance to the airflow formed below the nozzle section (20) to descend towards the floor surface of the indoor space (S) is suppressed.

[0059] (3-3) Feature 3 In the discharge unit (10) of this embodiment, the annular air passages (P1 to P4) are arranged radially in multiple locations on the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis. The width of each annular air passage (P2 to P4) formed within the expanded pipe section (26) is the same.

[0060] As a result, the air flowing into the expanded section (26) is evenly distributed to each of the multiple annular air passages (P2 to P4) formed within the expanded section (26). This is because variations in pressure loss within each of the multiple annular air passages (P2 to P4) formed within the expanded section (26) are suppressed.

[0061] (3-4) Feature 4 The expanded pipe section (26) of this embodiment has four expanded pipes (26a, 26b, 26c, 26d). The expanded pipe section (26) is configured such that one expanded pipe (26b, 26c, 26d) is positioned inside one of the expanded pipes (26a, 26b, 26c).

[0062] As a result, four annular air passages (P1-P4) are formed inside the cylindrical section (24) that flow radially outward toward the bottom. When viewed from above, the four air passages (P1-P4) are arranged in a wave-like pattern from the center of the cylindrical section (24) toward the radial outward direction. As a result, the air flowing inside the cylindrical section (24) is straightened by the first air passage (P1) to the fourth air passage (P4) to spread radially outward, so that the air inside the cylindrical section (24) can flow out evenly from the opening at the lower end of the cylindrical section (24) without being biased.

[0063] (3-5) Feature 5 The discharge unit (10) of this embodiment further comprises a cylindrical extension (29) extending in the vertical direction, the extension (29) being located below the rectifier (27) and guiding the air flowing out from the rectifier (27) downwards.

[0064] The extension (29) prevents the air blown out from the nozzle (20) from spreading around the nozzle (20). This prevents the air blown out from the nozzle (20) from entraining the air in the indoor space (S), thereby improving the air purity in the lower part of the indoor space (S).

[0065] (3-6) Feature 6 The blowing unit (10) of this embodiment is located inside the box section (11) and further includes a guide section (12) that guides a portion of the air that flows into the box section (11) through the first connection hole (13) to the nozzle section (20).

[0066] (3-7) Feature 7 The rectifier section (27) in this embodiment has a honeycomb structure. The honeycomb structure improves the air rectification effect of the rectifier section (27).

[0067] (4) Comparative experiment between the discharge unit of this embodiment and a conventional discharge unit The effects of the rectifier section (27), the expanding section (26), and the guide section (12) of the discharge unit (10) in this embodiment will be explained using the analysis results shown in Figures 5 to 7.

[0068] The discharge unit (10a) of comparison unit 1 shown in Figure 5 does not have the rectifier (27) and guide (12) of this embodiment. The shape of the expanded pipe section of the discharge unit of comparison unit 1 is different from the shape of the expanded pipe section (26) of this embodiment. Specifically, the upper part of the expanded pipe section of comparison unit 1 has a curved portion. More specifically, in the cross-section along the vertical direction of the expanded pipe section, the expanded pipe section extends generally vertically downward from inside the neck section, then curves radially outward and downward, and extends along the inner wall of the cylindrical section.

[0069] As shown in Figure 5(a), the air blown into the box section (11) formed a concentrated airflow near the center and second side (19) of the neck section (22), indicating that a uniform airflow was not formed within the neck section (22), resulting in uneven airflow. Furthermore, as shown in Figure 5(b), when viewing the opening at the lower end of the cylindrical section (24) from below, it was found that there was unevenness in the air velocity blown out from the opening of the nozzle section (20). In particular, it was found that air was not being blown downwards properly in a certain area of ​​the opening (the hatched area in Figure 5(b)). It is presumed that in this area, air from the indoor space (S) is being drawn into the opening.

[0070] The blowing unit of comparison object 2 shown in Figure 6 does not have the guide section (12) of this embodiment. As shown in Figure 6(a), it was found that a bias occurred in the air velocity flowing from the box section (11) to the expanded pipe section (26), resulting in a non-uniform airflow in each flow path (P1 to P4) within the cylindrical section (24). However, as shown in Figure 6(b), when the opening at the lower end of the cylindrical section (24) is viewed from below, it was found that air is blown out over almost the entire opening of the cylindrical section (24), and that the air velocity of the blown-out air is also generally uniform.

[0071] As shown in Figure 7(a), in the discharge unit (10) of this embodiment, it was found that a portion of the air blown into the box section (11) comes into contact with the guide section (12), generating an airflow that flows into the neck section between the first connection hole (13) and the guide section (12). Furthermore, it was found that a uniform airflow is generated within the neck section (22), and the air flowing into the cylindrical section (24) is uniformly divided into each flow path (P1 to P4), forming an airflow that spreads throughout the entire cylindrical section (24). In addition, as shown in Figure 7(b), when the opening at the lower end of the cylindrical section (24) is viewed from below, it was found that air is blown out over the entire opening of the cylindrical section (24), and that the wind velocity of the blown air is more uniform than that of the discharge unit of comparison 2.

[0072] (5) Other embodiments The above embodiment may also have the following configuration.

[0073] As shown in Figure 8, in the cross-section obtained by cutting the cylindrical portion (24) in the direction of the cylindrical axis, the cylindrical portion (24) may have a portion that curves smoothly from top to bottom. In the example shown in Figure 8, the cylindrical portion (24) curves smoothly from the top end to the bottom end. In this case, the inner wall of the cylindrical portion (24) also curves smoothly from the top end to the bottom end. Furthermore, the cylindrical portion (24) may be formed such that the first angle θ1 between the tangent line at the top end of the cylindrical portion (24) and the horizontal line is smaller than the second angle θ2 between the tangent line at the bottom end of the cylindrical portion (24) and the horizontal line. This allows the airflow to be adjusted by providing the first and second angles on the inner wall of the cylindrical portion (24), thereby promoting a uniform distribution of air.

[0074] In the above embodiment, the expanded pipe section (26) may be formed such that the flow path widths of the first air passage (P1) to the fourth air passage (P4) are the same.

[0075] The expanded pipe section (26) may have one to three expanded pipes, or five or more expanded pipes. The discharge unit (10) does not have to have an expanded pipe section (26). The more expanded pipes (26a, 26b, 26c, 26d) there are, the more airflow channels there are, so that a uniform airflow can be formed inside the cylindrical section (24) without the airflow being disturbed.

[0076] The discharge unit (10) does not necessarily have a neck portion (22). In this case, the discharge unit (10) has a cylindrical portion (24) connected to the lower surface of the box portion (11).

[0077] In the discharge unit (10), the multiple radially outward-extending air passages (P1~P4) formed by the multiple expansion pipes (26a, 26b, 26c, 26d) do not necessarily have to be formed parallel to each other.

[0078] In the discharge unit (10), the upper parts of the air passages (P1~P4) within the cylindrical section (24) do not have to be formed in a straight line. In other words, in the cross-section of the expanded pipe section (26) in the direction of the cylindrical axis, the upper parts of each expanded pipe (26a, 26b, 26c, 26d) do not have to be formed in a straight line. For example, the upper parts of the expanded pipes (26a, 26b, 26c, 26d) may be formed to curve outward in the radial direction.

[0079] The discharge unit (10) does not need to have an extension (29). In this case, the lower end of the cylindrical portion (24) of the discharge unit (10) is exposed to the indoor space (S).

[0080] The discharge unit (10) does not need to have a guide section (12).

[0081] The air conditioning unit (30) of the air conditioning system (1) may take in indoor air instead of outside air. The box section (11) does not need to be located above the indoor space (S).

[0082] While embodiments and modifications have been described above, it will be understood that a variety of changes in form and details are possible without departing from the spirit and scope of the claims. Furthermore, these embodiments and modifications may be combined or substituted as appropriate, as long as they do not impair the functions of the subject matter of this disclosure. The terms “First,” “Second,” etc., used above are used to distinguish the phrases to which these terms are attached, and do not limit the number or order of such phrases. [Industrial applicability]

[0083] As explained above, this disclosure is useful for discharge units. [Explanation of Symbols]

[0084] 10. Discharge Unit 11 Box section 12 Guide section 13. First connection hole (connection hole) 20 Nozzle section 24 Cylinder part 26. Pipe expansion section 26a,26b,26c,26d tube expansion 27 Rectifier 29 Extension 52 ducts S Indoor space (target space) R target area P1~P4 Airflow channels

Claims

1. A discharge unit for performing displacement air conditioning to maintain a predetermined environment in a target area (R) formed below a target space (S) that is subject to air conditioning, up to a predetermined height from the floor surface, A box section (11) is positioned above the aforementioned target space (S), The box portion (11) is positioned below the nozzle portion (20) which blows air from inside the box portion (11) downward into the target space (S), A connection hole (13) is provided on the side of the box section (11) to which the outlet end of the air transport duct (52) is connected. The nozzle portion (20) is A cylindrical portion (24) formed such that the opening area increases from top to bottom, An expanded pipe section (26) is positioned inside the cylindrical section (24) and forms an annular air passage (P1 to P4) that widens radially outward from the cylindrical section (24) as it extends from top to bottom, The cylindrical portion (24) is provided below the cylindrical portion (24) and includes a rectifier (27) that rectifies the air flowing through the cylindrical portion (24) so ​​as to be oriented in the direction of the cylindrical axis. Air outlet unit.

2. In the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis, the upper part of the air passage (P1 to P4) is formed in a straight line. The discharge unit according to claim 1.

3. The air passages (P1 to P4) are arranged radially in multiple locations on the cross-section obtained by cutting the expanded pipe section (26) in the direction of the cylindrical axis. The width of each of the air passages (P2 to P4) formed within the expanded pipe section (26) is the same. The discharge unit according to claim 1.

4. In the cross-section obtained by cutting the cylindrical portion (24) in the direction of the cylindrical axis, the cylindrical portion (24) has a portion that curves smoothly from top to bottom, and the first angle between the tangent at the upper end of the cylindrical portion (24) and the horizontal line is smaller than the second angle between the tangent at the lower end of the cylindrical portion (24) and the horizontal line. The discharge unit according to claim 1.

5. The expanded section (26) has four or more expanded tubes (26a, 26b, 26c, 26d), and is configured such that one expanded tube (26b, 26c, 26d) is positioned inside one of the expanded tubes (26a, 26b, 26c). A blowing unit according to any one of claims 1 to 4.

6. It further comprises a cylindrical extension (29) that extends in the vertical direction, The extension (29) is provided below the straightening section (27) and guides the air flowing out from the straightening section (27) downward. A blowing unit according to any one of claims 1 to 4.

7. The box portion (11) further comprises a guide portion (12) positioned inside the box portion (11) that guides a portion of the air that flows into the box portion (11) through the connection hole (13) to the nozzle portion (20). A blowing unit according to any one of claims 1 to 4.

8. The rectifier section (27) has a honeycomb structure. A blowing unit according to any one of claims 1 to 4.

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