Blower unit

Abstract

This blower unit comprises: a box part (11) disposed in a plenum space above a target space (S); and a nozzle part (20) which is disposed below the box part (11) and which blows air in the box part (11) downward into the target space (S). The nozzle part (20) has: a tapered tubular part (24) formed such that the opening area thereof increases proceeding from above to below; a duct expansion part (26) disposed on the inner side of the tubular part (24) and forming annular air flow paths (P1 to P4) that expand outward in the radial direction of the tubular part (24) proceeding from above to below; and an airflow regulating part (27) provided below the tubular part (24) to regulate the flow of the air flowing through the tubular part (24) so as to be oriented in the tube axis direction.

Description

Blowing unit

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

[0002] In the displacement air conditioning method disclosed in Patent Document 1, fresh air is supplied from the ceiling of the target space toward the floor, thereby forming a temperature layer due to the density difference caused by the air temperature. As a result, only the lower part of the target space is air-conditioned.

[0003] Japanese Patent Application Laid-Open No. 2023-58226

[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 in the target space, the clean air cannot reach 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.

[0006] A 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 lower part of a target space (S) to be air-conditioned in a predetermined environment, including: a box part (11) arranged above the target space (S); and a nozzle part (20) arranged below the box part (11) and blowing the air in the box part (11) downward into the target space (S). A connection hole (13) to which an outflow end of a duct (52) for conveying air is connected is provided on a side surface of the box part (11). The nozzle part (20) includes: a tapered cylindrical part (24) formed such that an opening area expands from above downward; an expanding part (26) arranged inside the cylindrical part (24) and forming an annular air flow path (P1 to P4) that expands radially outward of the cylindrical part (24) from above downward; and a rectifying part (27) provided below the cylindrical part (24) and rectifying the air flowing through the cylindrical part (24) so as to be in the cylinder axis direction.

[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 such processing is unnecessary with the air outlet unit (10) of this disclosure.

[0008] In addition, the expanded section (26) creates an annular airflow channel (P1 to 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 in the indoor space (S), thus preventing it from mixing with the air 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] In the second embodiment, in the first embodiment, the upper part of the air passage (P1 to P4) is formed in a straight line at the cross-section obtained by cutting the expanded pipe portion (26) in the direction of the cylindrical axis.

[0011] In the second embodiment, the upper part of the air passages (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 portion (20) more effectively than when the upper part of the air passages (P1 to P4) is formed to curve outward in the radial direction, for example.

[0012] A third embodiment is the first or second embodiment, wherein the expanded section (26) has four or more expanded sections (26a, 26b, 26c, 26d), and is configured such that one expanded section (26b, 26c, 26d) is positioned inside one expanded section (26a, 26b, 26c).

[0013] In the third embodiment, annular air passages (P1 to P4) are formed between each of the radially adjacent expanded tubes (26a, 26b, 26c, 26d). By forming multiple such air passages (P1 to P4), air moving from top to bottom within the cylindrical section (24) can be easily diffused within the cylindrical section (24).

[0014] A fourth embodiment further comprises a cylindrical extension (29) extending in the vertical direction in any one of the first to third embodiments, wherein the extension (29) is provided below the rectifier (27) and guides the air flowing out from the rectifier (27) downward.

[0015] In the fourth embodiment, the air rectified in the rectifier (27) passes through the extension (29), generating an airflow that descends toward the floor without diffusing around the nozzle (20). This prevents the air blown out from the nozzle (20) from entraining the air in the target space (S), thereby increasing the cleanliness of the lower part of the target space (S).

[0016] A fifth embodiment further comprises, in any one of the first to fourth embodiments, a guide portion (12) disposed inside the box portion (11) and guiding a portion of the air that flows into the box portion (11) through the connection hole (13) to the nozzle portion (20).

[0017] In the fifth embodiment, a portion of the air flowing from the connection hole (13) into the box section (11) is guided by the guide section (12) and flows into the nozzle section (20). In this way, it is prevented that all of the air flowing from the connection hole (13) into the box section (11) reaches the side wall opposite the connection hole (13), and air can be distributed uniformly throughout the entire opening region that forms the inlet of the cylindrical section (24).

[0018] The sixth aspect is that in any one of the first to fifth aspects, the rectifier (27) has a honeycomb structure.

[0019] In the sixth embodiment, the honeycomb structure can improve the airflow straightening effect of the straightening section (27).

[0020] Figure 1 is a schematic diagram showing an indoor space equipped with the air conditioning system of the embodiment. Figure 2 is a longitudinal cross-sectional view showing the configuration of the discharge unit of the embodiment. Figure 3 is a schematic diagram showing the direction of airflow within the discharge unit. Figure 4 is a schematic diagram showing the direction of airflow within a discharge unit having an expanded pipe section of a different shape from the expanded pipe section of this embodiment. Figure 5 is a diagram showing the airflow and wind speed of the discharge unit of comparison target 1. Figure 5(a) is the analysis result showing the direction of airflow within the discharge unit. Figure 5(b) is the analysis result showing the wind speed distribution viewed from below the cylindrical section of the discharge unit. Darker colors indicate higher wind speeds. Figure 6 is a diagram showing the airflow and wind speed of the discharge unit of comparison target 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 section of the discharge unit. Darker colors indicate higher wind speeds. 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. Darker colors indicate higher wind speeds.

[0021] 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.

[0022] (1) Air Conditioning System As shown in Figure 1, the discharge unit (10) of this embodiment is applied to the 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.

[0023] 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.

[0024] 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 system (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.

[0025] As shown in Figures 1 and 2, the air conditioning system (1) includes an air conditioning unit (30) and a discharge unit (10).

[0026] (1-1) Air conditioning unit The air conditioning unit (30) is a device that processes the outside air (OA) taken in 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).

[0027] 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).

[0028] 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.

[0029] 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.

[0030] (1-2) Discharge Unit The discharge unit (10) of this embodiment has a box section (11) and a nozzle section (20).

[0031] 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).

[0032] 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).

[0033] 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).

[0034] 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).

[0035] 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 tapered so that the opening area increases from top to bottom. 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.

[0036] 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.

[0037] 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).

[0038] The expanded section (26) forms an annular air passage (P1 to P4) that expands radially outward from the cylindrical section (24) as it moves from the top to the bottom within the cylindrical section (24). Specifically, five air passages (P1 to P5) are formed within the cylindrical section (24). The first air passage (P1) is a passage formed between the inner surface of the cylindrical section (24) and the first expanded section (26a). The second air passage (P2) is a passage formed between the first expanded section (26a) and the second expanded section (26b). The third air passage (P3) is a passage formed between the second expanded section (26b) and the third expanded section (26c). The fourth air passage (P4) is a passage formed between the third expanded section (26c) and the fourth expanded section (26d). The fifth air passage (P5) is a passage inside the fourth expanded section (26d). 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 to P4) is formed in a straight line. The upper part of the air passage (P1 to P4) means the area above the intermediate part between the lower end and the upper end of the air passage (P1 to P4). Alternatively, when the distance in the cylindrical axis direction between the lower end and the upper end of the air passage (P1 to P4) is H, the upper part of the air passage (P1 to P4) may be the region from H / 3 to H / 5 from the upper end of the air passage (P1 to P4).

[0039] 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.

[0040] Furthermore, the four expanded pipes (26a, 26b, 26c, 26d) may be arranged so that the radial flow widths of the first air passage (P1) to the fourth air passage (P4) are the same. This suppresses variations in pressure loss within each of the air passages from the first air passage (P1) 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 second air passage (P2) to the fourth air passage (P4).

[0041] The rectifier section (27) is provided below the cylindrical section (24). Specifically, the rectifier section (27) is provided at the lower end of the cylindrical section (24). The rectifier section (27) rectifies the air flowing inside the cylindrical section (24) so ​​that it is directed in the direction of the cylindrical axis. The rectifier section (27) is a plate-shaped member having multiple holes formed in the thickness direction. The plate thickness of the rectifier section (27) is, for example, 20 mm to 40 mm. 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 flow channels whose cross-sectional shape is formed in a hexagon, perpendicular to the direction of the airflow channel. The side length of the hexagon of the core flow channel is 10 mm to 20 mm.

[0042] 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.

[0043] (2) Explanation of the operation of the air conditioner When the air conditioner (1) starts operating, a refrigeration cycle is executed in the refrigerant circuit, and the fan (42) rotates. The outside air sucked into the first duct (51) by the rotation of the fan (42) flows into the air treatment unit (40) and is cooled by exchanging heat with the refrigerant in the evaporator (43). The air thus treated (cooled) by the air treatment unit (40) is sometimes referred to as the air to be treated.

[0044] As shown by the arrow illustrated in FIG. 3, after the air to be treated is conveyed to the second duct (52), it flows into the box portion (11) through the first connection hole (13). The air that has flowed into the box portion (11) flows toward the second side surface (19) facing the first side surface (17), and then flows downward toward the nozzle portion (20). A part of the air flowing into the box portion (11) is guided by the guide portion (12) and flows downward toward the nozzle portion (20).

[0045] The air flowing into the nozzle portion (20) passes through the neck portion (22) and then branches into five flow paths, namely the first air flow path (P1) to the fifth air flow path (P5), inside the cylinder portion (24). The branched air spreads over the entire opening at the lower end of the cylinder portion (24) and is rectified into a downward flow by the rectifying portion (27). Then, it passes through the extension portion (29) and moves downward toward the floor of the indoor space (S).

[0046] (3) Features (3-1) Feature 1 The blowing unit (10) of the present embodiment is a blowing unit for performing displacement air conditioning to maintain an air conditioning target area formed from the floor surface to a predetermined height in a target space (S) to be air-conditioned in a predetermined environment. The blowing unit (10) includes a box portion (11) disposed in the ceiling space of the target space (S), and a nozzle portion (20) disposed below the box portion (11) and blowing the air in the box portion (11) downward into the target space (S). A connection hole (13) to which the outflow end of a second duct (52) for conveying air is connected is provided on the side surface of the box portion (11). The nozzle portion (20) includes a tapered cylindrical portion (24) formed such that the opening area expands as it goes from above downward, an expanding pipe portion (26) disposed inside the cylindrical portion (24) and forming an annular air flow path (P1 to P4) that expands radially outward in the diameter direction of the cylindrical portion (24) as it goes from above downward, and a rectifying portion (27) provided below the cylindrical portion (24) and rectifying the air flowing through the cylindrical portion (24) so as to be in the cylindrical axis direction.

[0047] According to the present embodiment, by using the box portion (11), the blowing unit (10) can be easily attached even when the space in the ceiling space is relatively narrow. If the box portion (11) is not used, processing for bending the second duct (52) extending in the horizontal direction at a right angle toward the nozzle portion (20) is required, but such processing can be made unnecessary in the blowing unit (10) of the present embodiment.

[0048] In addition, an annular air flow path (P1 to P4) that expands radially outward in the diameter direction is formed in the cylindrical portion (24) from above downward by the expanding pipes (26a, 26b, 26c, 26d). As a result, the air flowing through the cylindrical portion (24) from above downward diffuses and can be blown out from the entire opening region at the lower end of the cylindrical portion (24).

[0049] 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.

[0050] (3-2) Feature 2 In the discharge unit (10) of this embodiment, the upper part of the air passage (P1 to 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.

[0051] As shown in Figure 4, in the cross-section along the vertical direction of the expanded pipe section (26), when the upper part of the expanded pipe section (26) is not formed in a straight line but is formed to curve radially outward, 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 with the shape of the expanded pipe section (26) in this embodiment, the generation of an airflow drawn into the cylindrical section (24) is suppressed. Thus, by forming the upper part of the airflow passage (P1 to 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.

[0052] (3-3) Feature 3 The expanded pipe section (26) of this embodiment has four or more expanded pipes (26a, 26b, 26c, 26d). One expanded pipe (26b, 26c, 26d) is arranged inside one expanded pipe (26a, 26b, 26c).

[0053] As a result, four air passages (P1 to P4) are formed inside the cylindrical section (24) that flow radially outward toward the bottom. When viewed from above, the four air passages (P1 to 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 becoming unevenly distributed.

[0054] (3-4) Feature 4 The discharge unit (10) of this embodiment further comprises a cylindrical extension (29) that extends in the vertical direction, and the extension (29) is provided below the rectifier (27) and guides the air flowing out from the rectifier (27) downward.

[0055] The extension (29) prevents the air immediately after it is 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).

[0056] (3-5) Feature 5 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).

[0057] (3-6) Feature 6 The rectifier section (27) of this embodiment has a honeycomb structure. The honeycomb structure improves the air rectification effect of the rectifier section (27).

[0058] (4) Comparative experiment between the discharge unit of this embodiment and a conventional discharge unit The effects of the flow straightening section (27), pipe expanding section (26), and guide section (12) of the discharge unit (10) of this embodiment will be explained using the analysis results shown in Figures 5 to 7.

[0059] The discharge unit (10a) of comparison object 1 shown in Figure 5 does not have the rectifier section (27) and guide section (12) of this embodiment. The shape of the expanded pipe section of the discharge unit of comparison object 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 object 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 roughly vertically downward from inside the neck section, then curves radially outward and downward, and extends along the inner wall of the cylindrical section.

[0060] 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) and that airflow was uneven. 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 (hatched area in Figure 5(b)). In this area, it is presumed that air from the indoor space (S) is being drawn into the opening.

[0061] The blowing unit of comparison object 2 shown in Figure 6 does not have the guide portion (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 portion (11) to the expanded pipe portion (26), resulting in a non-uniform airflow in each flow path (P1 to P4) within the cylindrical portion (24). However, as shown in Figure 6(b), when the opening at the lower end of the cylindrical portion (24) is viewed from below, it was found that air is blown out over almost the entire opening of the cylindrical portion (24), and that the air velocity of the blown-out air is also generally uniform.

[0062] 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.

[0063] (5) Other embodiments The above embodiments may also have the following configurations.

[0064] 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.

[0065] 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).

[0066] In the discharge unit (10), the multiple air passages (P1 to P4) extending radially outward, formed by the multiple expansion pipes (26a, 26b, 26c, 26d), do not necessarily have to be formed parallel to each other.

[0067] In the discharge unit (10), the upper parts of the air passages (P1 to 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.

[0068] The discharge unit (10) does not have 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).

[0069] The discharge unit (10) does not necessarily have to have a guide section (12).

[0070] 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).

[0071] 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., described above are used to distinguish the phrases to which these terms are attached and do not limit the number or order of such phrases.

[0072] As explained above, this disclosure is useful for discharge units.

[0073] 10 Discharge unit 11 Box section 12 Guide section 13 First connection hole (connection hole) 20 Nozzle section 24 Cylinder section 26 Expanded pipe section 26a, 26b, 26c, 26d Expanded pipe 27 Flow straightening section 29 Extension section 50 Duct S Indoor space (target space)

Claims

1. A dispensing unit for performing displacement air conditioning to maintain a predetermined environment in a target area (R) formed below a target space (S) to be air-conditioned, from the floor up to a predetermined height, comprising: a box section (11) positioned above the target space (S); a nozzle section (20) positioned below the box section (11) and blowing air from the box section (11) downward into the target space (S); a connection hole (13) provided on the side of the box section (11) to which the outlet end of an air transport duct (50) is connected; the nozzle section (20) comprises: a tapered cylindrical section (24) formed such that the opening area expands from top to bottom; and an expanded pipe section (26) positioned inside the cylindrical section (24) and forming an annular air passage (P1 to P4) that expands radially outward from the cylindrical section (24) from top to bottom; A blowing unit having a flow straightening section (27) provided below the cylindrical section (24) and which straightens the air flowing through the cylindrical section (24) so ​​as to be oriented in the direction of the cylindrical axis.

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

3. The discharge unit according to claim 1 or 2, wherein the expanded pipe section (26) has four or more expanded pipes (26a, 26b, 26c, 26d), and is configured such that one expanded pipe (26b, 26c, 26d) is arranged inside one expanded pipe (26a, 26b, 26c).

4. The blowing unit according to any one of claims 1 to 3, further comprising a cylindrical extension (29) extending in the vertical direction, wherein the extension (29) is provided below the rectifier (27) and guides the air flowing out from the rectifier (27) downward.

5. The blowing unit according to any one of claims 1 to 4, further comprising a guide portion (12) disposed inside the box portion (11) and guiding a portion of the air that flows into the box portion (11) through the connection hole (13) to the nozzle portion (20).

6. The air outlet unit according to any one of claims 1 to 5, wherein the rectifier section (27) has a honeycomb structure.

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