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EP-4737809-A1 - HEAT EXCHANGE UNIT AND AIR CONDITIONING DEVICE

EP4737809A1EP 4737809 A1EP4737809 A1EP 4737809A1EP-4737809-A1

Abstract

In an indoor unit (7), a cross-flow fan (70) is disposed at a position corresponding to an inlet port (52) in a casing (50). The inlet port includes a first region (A1) overlapping the cross-flow fan in front view and a second region (A2) located on a side closer to a tongue portion (63) provided in the casing relative to the first region. Among a plurality of guide panels provided in the inlet port, a first guide panel (92a) closest to the center of the cross-flow fan in the first region is in an orientation extending upward toward the cross-flow fan, and a second guide panel (92b) located in the second region is provided in an orientation extending downward toward the cross-flow fan.

Inventors

  • The designation of the inventor has not yet been filed

Assignees

  • DAIKIN INDUSTRIES, LTD.

Dates

Publication Date
20260506
Application Date
20250529

Claims (8)

  1. A heat exchange unit comprising: a casing (50) having an inlet port (52), an outlet port (54), and an air passage (56) allowing the inlet port (52) and the outlet port (54) to communicate with each other; a cross-flow fan (70) housed in the air passage (56); and a heat exchanger (80) disposed downstream of the cross-flow fan (70) in the air passage (56), the cross-flow fan (70) being disposed at a position corresponding to the inlet port (52) in a first direction orthogonal to an opening surface of the inlet port (52), the cross-flow fan (70) being configured to rotate about an axis (Ra) extending along a second direction orthogonal to the first direction, the casing (50) being provided with a tongue portion (63) forming a wall surface of the air passage (56) along part of an outer periphery of the cross-flow fan (70) on one side of the cross-flow fan (70) in a third direction orthogonal to the first direction and the second direction, the inlet port (52) including a first region (A1) overlapping the cross-flow fan (70) when viewed in the first direction, and a second region (A2) located on a side closer to the tongue portion (63) in the third direction relative to the first region (A1), the inlet port (52) being provided with a plurality of guide panels (92), each extending in the second direction and spaced apart from each other in the third direction, the plurality of guide panels (92) including a first guide panel (92a) located closest to a center (C1) of the cross-flow fan (70) in the first region (A1) and a second guide panel (92b) located in the second region (A2), in a cross section orthogonal to the second direction, for each guide panel (92), a straight line passing through a center (C2) of the guide panel (92) and the center (C1) of the cross-flow fan (70) being defined as a first straight line (L1), for each guide panel (92), a straight line passing through an upstream end (93a) of the guide panel (92) on an upstream side in an air flow direction and a downstream end (93b) of the guide panel (92) on a downstream side in the air flow direction being defined as a second straight line (L2), among intersections, each between an outer peripheral surface (70a) of the cross-flow fan (70) and the first straight line (L 1), an intersection closer to the inlet port (52) being defined as a first intersection (P1), and among intersections, each between the outer peripheral surface (70a) of the cross-flow fan (70) and the second straight line (L2), an intersection closer to the inlet port (52) being defined as a second intersection (P2), under these definitions the first guide panel (92a) being provided in an orientation inclined with respect to the first direction such that the second intersection (P2) is located on a trailing side in a rotation direction of the cross-flow fan (70) relative to the first intersection (P1), the second guide panel (92b) being provided in an orientation in which a second inclination angle formed by the second straight line (L2) of the second guide panel (92b) with respect to the first direction is smaller than a first inclination angle formed by the second straight line (L2) of the first guide panel (92a) with respect to the first direction, or in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle.
  2. The heat exchange unit of claim 1, wherein the plurality of guide panels (92) includes, in the first region (A1), a third guide panel (92c) located between the first guide panel (92a) and the second guide panel (92b), and the third guide panel (92c) is provided in an orientation in which a third inclination angle formed by the second straight line (L2) of the third guide panel (92c) with respect to the first direction is an angle between the first inclination angle and the second inclination angle.
  3. The heat exchange unit of claim 1 or 2, wherein the air passage (56) includes a suction space (56a) provided between the inlet port (52) and the cross-flow fan (70), and the suction space (56a) corresponds to the second region (A2) in the first direction and extends so as to correspond to a portion of the cross-flow fan (70) closer to the inlet port (52) in the third direction.
  4. The heat exchange unit of any one of claims 1 to 3, wherein the third direction corresponds to an up-down direction, the cross-flow fan (70) rotates such that a blade (76) of the cross-flow fan (70) rotates from an upper side to a lower side on a side closer to the inlet port (52), the first guide panel (92a) is inclined with respect to the first direction such that the second straight line (L2) extends upward toward the cross-flow fan (70), and the second guide panel (92b) is located higher than the first guide panel (92a), and is inclined with respect to the first direction such that the second straight line (L2) extends downward toward the cross-flow fan (70), or is in an orientation in which the second straight line (L2) is parallel to the first direction.
  5. The heat exchange unit of any one of claims 1 to 4, wherein the first inclination angle θ1 satisfies 0° < θ1 ≤ 60°.
  6. The heat exchange unit of any one of claims 1 to 5, wherein the second guide panel (92b) is in an orientation in which the second inclination angle is formed with respect to the first direction on a side opposite to a side on which the first guide panel (92a) forms the first inclination angle, and the second inclination angle θ2 satisfies 0° ≤ θ2 ≤ 45°.
  7. The heat exchange unit of any one of claims 1 to 6, wherein the plurality of guide panels (92) includes a plurality of fourth guide panels (92d) disposed on an opposite side from the second guide panel (92b) relative to the first guide panel (92a), each of the plurality of fourth guide panels (92d) is provided in an orientation in which a fourth inclination angle formed by the second straight line (L2) of the fourth guide panel (92d) with respect to the first direction is greater than the first inclination angle, and the fourth inclination angle increases as a distance between the fourth guide panel (92d) forming the fourth inclination angle and the first guide panel (92a) increases.
  8. An air conditioning apparatus comprising: the heat exchange unit (7) of any one of claims 1 to 7.

Description

TECHNICAL FIELD The present disclosure relates to a heat exchange unit and an air conditioning apparatus. BACKGROUND ART Patent Document 1 discloses a heat exchange unit including a cross-flow fan and a heat exchanger. The cross-flow fan and the heat exchanger are housed in a casing. An inlet port is formed in a lower portion of the front surface of the casing, and an outlet port is formed in the upper surface of the casing. An air passage extending from the inlet port to the outlet port is provided in the casing. The cross-flow fan is disposed at a position corresponding to the inlet port of the air passage. The heat exchanger is disposed downstream of the cross-flow fan in the air passage. CITATION LIST PATENT DOCUMENT Patent Document 1: Japanese Utility Model Publication No. H3-127137 SUMMARY OF THE INVENTION TECHNICAL PROBLEM In the heat exchange unit such as one described above, the inlet port is provided with a plurality of guide panels spaced apart from each other in an up-down direction, which guide the air sucked into the air passage by operation of the cross-flow fan. In the heat exchange unit, it is conceivable to provide the cross-flow fan in the vicinity of the inlet port, orient the guide panel located at a position close to the cross-flow fan such that the air is guided in a direction opposite to the rotation direction of the cross-flow fan, and impart pre-whirl to the flow of air to be sucked into the cross-flow fan, thereby increasing the pressure produced by the cross-flow fan. In the heat exchange unit, the up-down width of the inlet port is made greater than the diameter of the cross-flow fan, thereby ensuring the flow rate of air sucked into the air passage. Accordingly, the air can be efficiently circulated through the air passage by the operation of the cross-flow fan. In this case, the plurality of guide panels is disposed over the entire opening surface of the inlet port. Thus, the guide panels are also provided at positions not overlapping the cross-flow fan in front view. In the configuration in which all the guide panels are provided at the inlet port in a uniform orientation that imparts pre-whirl, the following specific problems are caused. As illustrated in FIG. 15, when an inlet port (52a) is greater than the diameter of a cross-flow fan (70), and a plurality of guide panels (92) is in a uniform orientation, the air guided by the guide panels (92) closer to the upper edge of the inlet port (52a), which are at positions not overlapping the cross-flow fan (70) in front view, flows outward in the radial direction of the cross-flow fan (70), beside a tongue portion (63) forming a wall surface of an air passage (56) provided along part of the outer periphery of the cross-flow fan (70), and is then sucked into the cross-flow fan (70). Thus, the air guided by the guide panels (92) closer to the upper edge of the inlet port (52a) has a long path to the cross-flow fan (70), which causes the loss in the cross-flow fan (70). It is an object of the present disclosure to reduce the loss in a cross-flow fan in a heat exchange unit in which pre-whirl is generated by a guide panel provided in an inlet port. SOLUTION TO THE PROBLEM A first aspect of the present disclosure is directed to a heat exchange unit (7). The heat exchange unit (7) includes: a casing (50) having an inlet port (52), an outlet port (54), and an air passage (56) allowing the inlet port (52) and the outlet port (54) to communicate with each other; a cross-flow fan (70) housed in the air passage (56); and a heat exchanger (80) disposed downstream of the cross-flow fan (70) in the air passage (56). The cross-flow fan (70) is disposed at a position corresponding to the inlet port (52) in a first direction orthogonal to an opening surface of the inlet port (52), the cross-flow fan (70) being configured to rotate about an axis (Ra) extending along a second direction orthogonal to the first direction. The casing (50) is provided with a tongue portion (63) forming a wall surface of the air passage (56) along part of an outer periphery of the cross-flow fan (70) on one side of the cross-flow fan (70) in a third direction orthogonal to the first direction and the second direction. The inlet port (52) includes a first region (A1) overlapping the cross-flow fan (70) when viewed in the first direction, and a second region (A2) located on a side closer to the tongue portion (63) in the third direction relative to the first region (A1). The inlet port (52) is provided with a plurality of guide panels (92), each extending in the second direction and spaced apart from each other in the third direction. The plurality of guide panels (92) includes a first guide panel (92a) located closest to a center (C1) of the cross-flow fan (70) in the first region (A1) and a second guide panel (92b) located in the second region (A2). In a cross section orthogonal to the second direction, for each guide panel (92), a straight line passing through a cente