JP6524243B2 - Outdoor unit of air conditioner - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner provided with a blowout grill.

  Patent Literature 1 describes an outdoor unit of an air conditioner. The outdoor unit includes a blowout grill composed of a center plate member and a plurality of annular steel wires arranged concentrically around the center plate member. The central plate member is constituted of a central plate portion and a plurality of rectangular frames of similar shapes disposed around the central plate portion. The plurality of rectangular frame members are disposed so as to be positioned closer to the fan as they are positioned more outward.

JP-A-5-248662

  In the configuration described in Patent Document 1, each of the center plate portion constituting the center plate member and the plurality of rectangular frame members has a surface perpendicular to the flow direction of the air. For this reason, although the air flowing around the center of the fan can pass through the center plate member, the ventilation resistance to the air is increased. Therefore, there is a problem that the blowing noise of the outdoor unit is increased.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide an outdoor unit of an air conditioner capable of reducing the blowing noise of the outdoor unit.

An outdoor unit of an air conditioner according to the present invention has a boss and a wing disposed on the outer periphery of the boss, and is disposed upstream of the axial fan in the axial flow fan for blowing air and the flow of air. A heat exchanger that exchanges heat between the refrigerant flowing inside and the air, and a blowout grill that is disposed on the downstream side of the axial flow fan in the air flow so as to face the axial flow fan and blow out the air to the outside And the blowout grill has a central portion facing the boss, and an outer peripheral portion positioned on the outer peripheral side of the rotational trajectory of the wing when viewed in a direction parallel to the rotational axis of the axial fan. And an intermediate portion positioned between the central portion and the outer peripheral portion, at least the central portion being constituted by a linear member having a circular cross-sectional shape, and perpendicular to the rotation axis Based on a virtual plane intersecting with part of the wing The distance between the middle portion and the reference surface is a first distance, the distance between the central portion and the reference surface is a second distance, and the distance between the outer peripheral portion and the reference surface is a third. When the distance is taken, the second distance is longer than the third distance and shorter than the first distance.

  According to the present invention, the blowing noise of the outdoor unit can be reduced.

It is a perspective view which shows schematic structure of the outdoor unit 100 of the air conditioner concerning Embodiment 1 of this invention. It is a front view which shows schematic structure of the outdoor unit 100 of the air conditioner concerning Embodiment 1 of this invention. It is sectional drawing which shows the typical structure of the III-III cross section of FIG.

Embodiment 1
An outdoor unit of the air conditioner according to Embodiment 1 of the present invention will be described. The outdoor unit of the air conditioner constitutes an air conditioner together with the indoor unit, the refrigerant pipe and the like. FIG. 1 is a perspective view showing a schematic configuration of an outdoor unit 100 of an air conditioner according to the present embodiment. FIG. 2 is a front view showing a schematic configuration of the outdoor unit 100 of the air conditioner according to the present embodiment. In FIG. 2, the configuration in which the outdoor unit 100 is viewed in a direction parallel to the rotation axis R of the axial fan 20 is shown. FIG. 3 is a cross-sectional view showing a schematic configuration of the III-III cross section of FIG. In FIG. 3, the graph which shows the example of the wind speed distribution of the air which blows off from the blowing grill 30 is shown collectively. In addition, in FIGS. 1 to 3, there are cases where the relative dimensional relationship, the shape, and the like of the respective constituent members are different from the actual ones.

  As shown in FIGS. 1 to 3, the outdoor unit 100 of the air conditioner includes a box-shaped casing 10. A plurality of ventilating holes 15 for allowing air to flow into the inside of the housing 10 from the outside are formed on the back surface and one side surface of the housing 10. The front surface of the housing 10 has a circular opening 16 through which air flows from the inside of the housing 10 to the outside, and a cylindrical bell mouth 17 guiding air inside the housing 10 to the opening 16; Is formed.

  The inside of the housing 10 is partitioned by a partition plate 11 into a machine room 13 and a fan room 12. In the machine room 13, a compressor 14, refrigerant pipes, an electric goods box, and the like are accommodated. The fan chamber 12 accommodates an axial fan 20 for blowing air and a heat exchanger 21 disposed on the upstream side of the axial fan 20 in the flow of air.

  The axial fan 20 includes a motor 22 and an impeller 23 rotationally driven by the motor 22 about a rotation axis R. The impeller 23 is coaxial with the bell mouth 17 and disposed on the inner peripheral side of the bell mouth 17. The impeller 23 has a cylindrical boss 24 disposed on the rotation axis R, and a plurality of wings 25 disposed on the outer periphery of the boss 24. The boss 24 is connected to the output shaft 22 a of the motor 22. The plurality of wings 25 are arranged at equal intervals in the circumferential direction of the boss 24. The motor 22 is disposed upstream of the impeller 23 in the flow of air.

  The heat exchanger 21 exchanges heat between the refrigerant flowing inside and the air blown by the axial flow fan 20. The heat exchanger 21 is formed in an L-shaped cross section as a whole. The heat exchanger 21 is disposed along the back and one side of the housing 10 in which the air vents 15 are respectively formed. As the heat exchanger 21, for example, a cross fin type fin-and-tube heat exchanger including a plurality of fins and a heat transfer pipe in which a refrigerant flows is used.

  When the impeller 23 of the axial flow fan 20 is driven by the motor 22, air outside the housing 10 flows into the inside of the housing 10 through the ventilation holes 15. The air that has flowed into the inside of the housing 10 passes through the heat exchanger 21, the motor 22 and the impeller 23 in this order and flows out from the opening 16 to the front side of the housing 10.

  An outlet grill 30 is attached to the front of the housing 10 so as to cover the opening 16. The blowout grill 30 has a rectangular planar shape overlapping the entire area of the opening 16 when viewed in a direction parallel to the rotation axis R. The blowout grill 30 is disposed on the downstream side of the axial flow fan 20 in the air flow so as to face the impeller 23 of the axial flow fan 20. The air flowing out to the outside from the blowout grill 30 is blown out through the opening 16. The blowout grill 30 is generally curved so as to be convex in a direction away from the axial fan 20. That is, the blowout grille 30 is convex on the downstream side in the air flow as a whole. However, the vicinity of a central portion A, which will be described later, of the blowout grill 30 is locally curved so as to be convex in the direction approaching the axial fan 20. That is, the vicinity of the central portion A of the blowout grill 30 is convex on the upstream side in the flow of air, and when viewed from the downstream side, it is a caldera-like concave portion.

  The blowout grill 30 is formed of a linear member having a circular cross-sectional shape in the entire area. In the present example, a steel wire is used as the linear member. The blowout grill 30 has an outer frame portion 31 attached to the housing 10 and a plurality of inner frame portions 32 provided on the inner peripheral side of the outer frame portion 31 and having different sizes. . The outer frame portion 31 has a rectangular shape. The plurality of inner frame portions 32 have a circular shape, an oval shape, or a rectangular shape. The outer frame portion 31 and the plurality of inner frame portions 32 are not necessarily disposed in the same plane. However, when viewed in a direction parallel to the rotation axis R, the centers of the outer frame portion 31 and the plurality of inner frame portions 32 are generally positioned on the extension of the rotation axis R.

  The blowout grill 30 also has a plurality of radial portions 33. The plurality of radial portions 33 are curved so as to contact each of the plurality of inner frame portions 32 while extending radially from the central portion 34 toward the outer frame portion 31. The central portion 34 is located, for example, on the extension of the rotation axis R. The outer frame portion 31 and the plurality of inner frame portions 32 are mutually connected by a plurality of radial portions 33.

  The blowout grill 30 may be formed by integral molding using a resin. The blowout grille 30 is not limited to the combination of the outer frame portion 31, the plurality of inner frame portions 32 and the plurality of radial portions 33. For example, the blowout grill 30 has a grid structure including a plurality of linear members extending in one direction parallel to each other and one or more linear members intersecting with the plurality of linear members, respectively. It may be.

  The blowout grill 30 is divided into three parts of a central portion A, an intermediate portion B, and an outer peripheral portion C along a direction parallel to the radial direction of the axial flow fan 20 based on the positional relationship between the axial flow fan 20 and the impeller 23. Roughly divided into In the blowout grill 30 of this example, the central portion A, the intermediate portion B and the outer peripheral portion C are all formed by linear members having a circular cross-sectional shape.

  The central portion A is a region facing the boss 24. The central portion A has a circular shape centering on the central portion 34 when viewed in a direction parallel to the rotation axis R. When viewed in a direction parallel to the rotation axis R, the central portion A of this example has substantially the same shape as the boss 24.

  The outer peripheral portion C is a frame-like region located on the outer peripheral side of the rotation trajectory 25 a of the wing 25 when viewed in a direction parallel to the rotation axis R. An outer frame portion 31 is provided at the outer peripheral end of the outer peripheral portion C.

  The intermediate portion B is a region located between the central portion A and the outer peripheral portion C. When viewed in a direction parallel to the rotation axis R, the intermediate portion B has an annular shape centered on the central portion 34. Most of the middle portion B faces the wing 25. When viewed in a direction parallel to the rotation axis R, the middle portion B overlaps substantially the entire rotation trajectory 25 a including the outer peripheral end of the rotation trajectory 25 a of the wing 25. In FIG. 2, the boundary 41 between the central portion A and the intermediate portion B and the boundary 42 between the intermediate portion B and the outer peripheral portion C are indicated by broken lines.

  In the central portion A, the intermediate portion B, and the outer peripheral portion C of the blowout grill 30, the distances between them and the impeller 23 in the rotational axis R direction are different from each other. Here, a virtual plane perpendicular to the rotation axis R and including a part of the wing 25 is defined as a reference plane 50 on the impeller 23 side. The distance (for example, distance L2) between the central portion A of the blowout grill 30 and the reference plane 50 is longer than the distance (for example, distance L3) between the outer periphery C of the blowout grill 30 and the reference plane 50, And it is shorter than the distance (for example, distance L1) between middle part B of blow-off grill 30 and reference plane 50 (L3 <L2 <L1). That is, the blowout grill 30 has a curved shape that is convex on the downstream side in the flow of air in the annular intermediate portion B, based on the outer peripheral portion C. In addition, the blowout grill 30 has a curved shape that is convex on the upstream side in the flow of air at the circular central portion A located on the inner peripheral side of the intermediate portion B, based on the intermediate portion B. .

  The intermediate portion B has a constant distance from the reference plane 50 in a direction parallel to the radial direction of the axial fan 20 (for example, in the lateral direction in FIG. 3 or a direction along any of the plurality of radial portions 33). And an area B1. That is, the middle portion B is parallel to the reference surface 50 in the region B1. The area B1 is an area where the distance between the blowout grill 30 and the reference surface 50 is the longest, and is the area of the blowout grill 30 that most protrudes downstream. In FIG. 2, the inner circumferential end 43 and the outer circumferential end 44 of the region B1 are indicated by broken lines, respectively. When viewed in a direction parallel to the rotation axis R, the region B1 has an annular shape centered on the central portion 34. Further, when viewed in a direction parallel to the rotation axis R, the entire region B1 overlaps the rotation trajectory 25a of the wing 25. For example, the area B1 overlaps with 1⁄2 or more of the rotation trajectory 25a in area ratio.

  As described above, the outdoor unit 100 of the air conditioner according to the present embodiment has the boss 24 and the wing 25 disposed on the outer periphery of the boss 24, and the axial flow fan 20 for blowing air, and the air The heat exchanger 21 is disposed upstream of the axial fan 20 in the flow of the air and performs heat exchange between the refrigerant flowing therethrough and the air, and the axial fan 20 downstream of the axial fan 20 in the flow of air. When the blowout grill 30 is viewed in a direction parallel to the rotation axis R of the axial flow fan 20, the blowout grill 30 is disposed opposite to the blowout grill 30 for blowing out air to the outside. It has an outer peripheral portion C located on the outer peripheral side of the rotation locus 25a of the wing 25 and an intermediate portion B located between the central portion A and the outer peripheral portion C, at least the central portion A being circular A linear member having a cross-sectional shape of An imaginary plane perpendicular to the rotation axis R and intersecting a part of the wing 25 is a reference plane 50, a distance between the intermediate portion B and the reference plane 50 is a first distance L1, and the central portion A and the reference plane 50 The second distance L2 is longer than the third distance L3, and the first distance L1 is longer than the third distance L3. It is shorter than that.

  According to this configuration, since the distance between the wing 25 and the intermediate portion B of the outlet grill 30 can be increased, the air velocity is increased before the air blown by the axial fan 20 passes through the outlet grill 30. It can be lowered. Therefore, since the pressure fluctuation in the outlet grill 30 can be suppressed, the blowing noise of the outdoor unit 100 can be reduced.

  Further, in this configuration, a caldera-like concave portion is formed around the central portion A of the blowout grill 30 as viewed from the downstream side. For this reason, the air flowing along the outer peripheral surface of the boss 24 is blown out toward the center side by the above-mentioned recess as shown by the thick arrow in FIG. Therefore, the wind speed distribution of the air blown out from the blowout grill 30 can be made uniform.

  In the lower graph of FIG. 3, an example of the wind speed distribution of the air blown out from the blowout grille in the configuration of the comparative example is shown by a broken line, and the wind speed distribution of the air blown out from the blowout grill 30 in the configuration of the present embodiment. An example of is shown by a solid line. Here, in the configuration of the comparative example, the distance between the reference surface 50 and the outlet grill 30 is L1 = L2 = L3. As shown in the graph of FIG. 3, according to the present embodiment, the wind speed distribution of the air blown out from the blowout grill 30 can be made uniform as compared with the configuration of the comparative example. Therefore, since the wind speed in the area | region where wind speed becomes relatively large can be reduced, the blowing noise of the outdoor unit 100 can be reduced.

  Further, according to the above configuration, at least the central portion A of the outlet grill 30 is formed by the linear member having a circular cross-sectional shape, so that the ventilation resistance to air passing through the central portion A is reduced. Can. Therefore, the blowing noise of the outdoor unit 100 can be reduced.

  Further, in the outdoor unit 100 of the air conditioner according to the present embodiment, the intermediate portion B is configured such that the distance between the intermediate portion B and the reference plane 50 in the direction parallel to the radial direction of the axial fan 20 becomes constant. In the region B1, the distance between the region B1 and the reference surface 50 may be the longest at the outlet grill 30.

  According to this configuration, the flow of air can be diffused without being concentrated in the region B1 of the blowout grill 30 that most protrudes to the downstream side. Therefore, the wind speed of the air passing through the blowout grill 30 can be made more uniform, so that the blowing noise of the outdoor unit 100 can be further reduced. In the case where the region B1 does not exist in the middle portion B (that is, in the case where the distance between the middle portion B and the reference surface 50 is locally longest in the direction parallel to the radial direction of the axial fan 20), The air flow is concentrated at the portion where the distance to the reference surface 50 is the longest. As a result, since the wind speed locally increases, it may be difficult to reduce the blowing noise of the outdoor unit 100.

  Further, in the outdoor unit 100 of the air conditioner according to the present embodiment, when viewed in a direction parallel to the rotation axis R, the entire area B1 may overlap with the rotation trajectory 25a of the wing 25.

  Further, in the outdoor unit 100 of the air conditioner according to the present embodiment, the central portion A, the intermediate portion B and the outer peripheral portion C (for example, the whole of the blowout grill 30) are configured by a plurality of steel wires or resin grids. It may be done.

  DESCRIPTION OF SYMBOLS 10 housing | casing 11 partition plate 12 fan room 13 machine room 14 compressor 15 air vent 16 opening 17 bellmouth 20 axial fan 21 heat exchanger 22 motor 22a output shaft 23 Impeller, 24 bosses, 25 wings, 25a rotation locus, 30 blowout grille, 31 outer frame portion, 32 inner frame portion, 33 radial portion, 34 central portion, 41, 42 boundary line, 43 inner circumferential end, 44 outer circumferential end, 50 reference plane, 100 outdoor unit, A central part, B middle part, B1 area, C outer peripheral part, R rotary shaft.

Claims (4)

An axial fan having a boss and a wing disposed around the boss and configured to blow air;
A heat exchanger disposed upstream of the axial flow fan in the air flow and performing heat exchange between the refrigerant flowing inside and the air;
A blowout grill which is disposed on the downstream side of the axial flow fan in the air flow so as to face the axial flow fan, and which blows air to the outside;
Equipped with
The blowout grille is
A central portion facing the boss,
When viewed in a direction parallel to the rotational axis of the axial flow fan, an outer peripheral portion positioned on the outer peripheral side with respect to the rotational trajectory of the wing;
An intermediate portion located between the central portion and the outer peripheral portion;
At least the central portion is constituted by a linear member having a circular cross-sectional shape,
An imaginary plane perpendicular to the rotation axis and intersecting a part of the wing is a reference plane,
A distance between the intermediate portion and the reference surface is a first distance,
A distance between the central portion and the reference surface is a second distance,
Assuming that the distance between the outer peripheral portion and the reference surface is a third distance,
An outdoor unit of an air conditioner, wherein the second distance is longer than the third distance and shorter than the first distance. The intermediate portion has a region in which a distance between the intermediate portion and the reference plane is constant in a direction parallel to the radial direction of the axial fan.
The outdoor unit of an air conditioner according to claim 1 , wherein a distance between the region and the reference surface is longest at the outlet grille. The outdoor unit of an air conditioner according to claim 2 , wherein when viewed in a direction parallel to the rotation axis, the entire region overlaps the rotation trajectory. The outdoor unit of an air conditioner according to any one of claims 1 to 3 , wherein the central portion, the intermediate portion, and the outer peripheral portion are formed of a plurality of steel wires or a grid made of resin.

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