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JP-7856935-B2 - Air outlet unit

JP7856935B2JP 7856935 B2JP7856935 B2JP 7856935B2JP-7856935-B2

Inventors

  • 大高 将悟
  • 松井 伸樹
  • 岡本 哲也
  • 荒川 武士
  • 矢本 勇樹

Assignees

  • ダイキン工業株式会社

Dates

Publication Date
20260512
Application Date
20250917
Priority Date
20240920

Claims (8)

  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, 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 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 blowing unit according to claim 1, wherein the width of each of the air passages (P2 to P4) formed within the expanded pipe section (26) is the same.
  4. The blowing unit according to claim 1, wherein 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.
  5. The discharge unit according to any one of claims 1 to 4, 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).
  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. The blowing unit according to any one of claims 1 to 4.
  7. 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).
  8. The blowing unit according to any one of claims 1 to 4, wherein the rectifying section (27) has a honeycomb structure.

Description

This disclosure relates to an air outlet unit. The displacement air conditioning system disclosed in Patent Document 1 supplies fresh air 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. This allows for air conditioning only in the lower part of the target space. Japanese Patent Publication No. 2023-58226 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 air outlet 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 shows the airflow and wind speed of the discharge unit of comparison unit 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 part of the discharge unit. Lighter colors indicate higher wind speeds.Figure 6 shows the airflow and wind speed of the discharge unit of comparison unit 2. Figure 6(a) shows the analysis results indicating the direction of airflow within the discharge unit. Figure 6(b) shows the analysis results indicating the wind speed distribution viewed from below the cylindrical part of the discharge unit. Lighter 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. Lighter colors indicate higher wind speeds.Figure 8 is a longitudinal cross-sectional view showing the configuration of the discharge unit in another embodiment. The embodiments of the present invention will be described below with reference to the drawings. Note that 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. (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 the 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. The specified height only needs to be lower than the room's ceiling. 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. 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, 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. As shown in Figures 1 and 2, the air conditioning system (1) includes an air conditioning unit (30) and a discharge unit (10). (1-1) Air conditioning unit The air conditioning unit (30) is a device that processes the 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). The first duct (51) is a duct that transports outside air to the air processing unit (40). One end of the first duct (51) communicates with the outside, and the other end communicates with the air processing unit (40). 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). An air passage is formed in the casing (41) through which air flows from the first duct (51) to the second duct (52). The fan (42) transports the ai