WO2017042865A1

WO2017042865A1 - Outdoor unit for air conditioner

Info

Publication number: WO2017042865A1
Application number: PCT/JP2015/075349
Authority: WO
Inventors: 池田　尚史; 誠治中島; 勝幸山本; 加藤　央平; 慎悟濱田
Original assignee: 三菱電機株式会社
Priority date: 2015-09-07
Filing date: 2015-09-07
Publication date: 2017-03-16
Also published as: JP6524243B2; JPWO2017042865A1

Abstract

This outdoor unit for an air conditioner is provided with an axial fan, a heat exchanger, and a blow-out grill. The blow-out grill has: a central part facing a boss; an outer peripheral part positioned closer to the outer peripheral side than the rotational trajectory of a wing when viewed in a direction parallel to the rotational axis of the axial fan; and an intermediate part positioned between the central part and the outer peripheral part. At least the central part is formed from a linear member having a circular cross-sectional shape. When a virtual plane that is perpendicular to the rotational axis and intersects a portion of the wing is taken as a reference surface, the distance between the intermediate part and the reference surface is taken as a first distance, the distance between the central part and the reference surface is taken as a second distance, and the distance between the outer peripheral part and the reference surface is taken as a third distance, the second distance is longer than the third distance and shorter than the first distance.

Description

Air conditioner outdoor unit

This invention relates to the outdoor unit of the air conditioner provided with the blowing grill.

Patent Document 1 describes an outdoor unit of an air conditioner. This outdoor unit includes a blowout grill configured by a center plate member and a plurality of annular steel wires arranged concentrically around the center plate member. The center plate member is composed of a center plate portion and a plurality of similarly shaped rectangular frame members disposed around the center plate portion. The plurality of rectangular frame members are arranged so that the one located on the outer side is located on the fan side.

Japanese Patent Laid-Open No. 5-248862

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

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an outdoor unit of an air conditioner that can reduce the blowing sound of the outdoor unit.

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

According to the present invention, it is possible to reduce the blowing sound of the outdoor unit.

It is a perspective view which shows schematic structure of the outdoor unit 100 of the air conditioner which concerns on Embodiment 1 of this invention. It is a front view which shows schematic structure of the outdoor unit 100 of the air conditioner which concerns on Embodiment 1 of this invention. FIG. 3 is a cross-sectional view showing a schematic configuration of a III-III cross section of FIG. 2.

Embodiment 1 FIG.
The outdoor unit of the air conditioner according to Embodiment 1 of the present invention will be described. The outdoor unit of an air conditioner constitutes an air conditioner together with an indoor unit and a refrigerant pipe. FIG. 1 is a perspective view showing a schematic configuration of an outdoor unit 100 for an air conditioner according to the present embodiment. FIG. 2 is a front view illustrating a schematic configuration of the outdoor unit 100 of the air conditioner according to the present embodiment. FIG. 2 shows a configuration in which the outdoor unit 100 is viewed in a direction parallel to the rotation axis R of the axial fan 20. 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 FIGS. 1 to 3, the relative dimensional relationship and shape of each component may differ from the actual one.

As shown in FIGS. 1 to 3, an outdoor unit 100 of an air conditioner includes a box-shaped casing 10. A plurality of ventilation holes 15 for allowing air to flow into the housing 10 from the outside are formed on the back surface and one side surface of the housing 10. On the front surface of the housing 10, a circular opening 16 that allows air to flow out from the inside of the housing 10 to the outside, a cylindrical bell mouth 17 that guides the air inside the housing 10 to the opening 16, Is formed.

The interior of the housing 10 is partitioned into a machine room 13 and a fan room 12 by a partition plate 11. The machine room 13 accommodates a compressor 14, a refrigerant pipe, an electrical component box, and the like. The fan chamber 12 accommodates an axial fan 20 that blows air and a heat exchanger 21 that is disposed upstream of the axial fan 20 in the air flow.

The axial fan 20 includes a motor 22 and an impeller 23 that is driven to rotate about the rotation axis R by the motor 22. The impeller 23 is arranged coaxially with the bell mouth 17 and on the inner peripheral side of the bell mouth 17. The impeller 23 includes a cylindrical boss 24 disposed on the rotation axis R and a plurality of blades 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 blades 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 air flow.

The heat exchanger 21 performs heat exchange between the refrigerant circulating in the interior and the air blown by the axial fan 20. The heat exchanger 21 has an L-shaped cross section as a whole. The heat exchanger 21 is disposed along the back surface and one side surface of the housing 10 in which the ventilation holes 15 are respectively formed. As the heat exchanger 21, for example, a cross-fin type fin-and-tube heat exchanger provided with a plurality of fins and a heat transfer tube in which a refrigerant flows inside is used.

When the impeller 23 of the axial fan 20 is driven by the motor 22, air outside the housing 10 flows into the housing 10 through the ventilation holes 15. The air that has flowed into 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.

A blow grill 30 is attached to the front surface of the housing 10 so as to cover the opening 16. The blowing grill 30 has a rectangular planar shape that overlaps the entire area of the opening 16 when viewed in a direction parallel to the rotation axis R. The blow-out grill 30 is disposed on the downstream side of the axial fan 20 in the air flow so as to face the impeller 23 of the axial fan 20. From the blowing grill 30, the air flowing out through the opening 16 is blown out. The blow-out grill 30 is curved so as to be convex in a direction away from the axial fan 20 as a whole. That is, the blow-out grill 30 is convex on the downstream side in the air flow as a whole. However, the center part A vicinity mentioned later of the blowing grill 30 is curving so that it may become convex in the direction which approaches the axial fan 20 locally. That is, the vicinity of the central portion A of the blow-out grill 30 is convex toward the upstream side in the air flow, and is a caldera-shaped concave portion when viewed from the downstream side.

The blow-out grill 30 is composed of a linear member having a circular cross-sectional shape throughout the entire area. In this example, a steel wire is used as the linear member. The blow-out grill 30 includes an outer frame portion 31 attached to the housing 10 and a plurality of inner frame portions 32 having different sizes provided on the inner peripheral side of the outer frame portion 31. . 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 arranged 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 located on an extension line of the rotation axis R.

Further, the blowout grill 30 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 center part 34 is located on the extension line of the rotating shaft R, for example. The outer frame portion 31 and the plurality of inner frame portions 32 are connected to each other by a plurality of radial portions 33.

In addition, the blowing grill 30 may be formed by integral molding using resin. Further, the blowout grill 30 is not limited to a configuration in which the outer frame portion 31, the plurality of inner frame portions 32, and the plurality of radial portions 33 are combined. For example, the blow grill 30 has a lattice structure including a plurality of linear members extending in one direction in parallel with each other and one or a plurality of linear members intersecting with each of the plurality of linear members. There may be.

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

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

The outer peripheral portion C is a frame-like region located on the outer peripheral side with respect to the rotation locus 25a of the blade 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 part B is an area located between the central part A and the outer peripheral part 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 intermediate portion B faces the wing 25. When viewed in a direction parallel to the rotation axis R, the intermediate portion B overlaps with substantially the entire rotation locus 25 a including the outer peripheral end of the rotation locus 25 a of the blade 25. In FIG. 2, the boundary line 41 between the central part A and the intermediate part B and the boundary line 42 between the intermediate part B and the outer peripheral part C are indicated by broken lines, respectively.

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

The intermediate portion B has a constant distance from the reference surface 50 in a direction parallel to the radial direction of the axial fan 20 (for example, the horizontal direction in FIG. 3 or a direction along one of the plurality of radial portions 33). It has area | region B1 used as this. That is, the intermediate part B is parallel to the reference plane 50 in the region B1. Region B <b> 1 is a region where the distance between the blowing grill 30 and the reference surface 50 is the longest, and is the region that protrudes most downstream in the blowing grill 30. In FIG. 2, the inner peripheral end 43 and the outer peripheral 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 with the central portion 34 as the center. Further, when viewed in a direction parallel to the rotation axis R, the entire region B1 overlaps with the rotation locus 25a of the blade 25. For example, the region B1 overlaps with 1/2 or more of the rotation locus 25a in area ratio.

As described above, the outdoor unit 100 of the air conditioner according to the present embodiment includes the boss 24 and the blades 25 disposed on the outer periphery of the boss 24, and the axial fan 20 that blows air, the air The heat exchanger 21 is arranged on the upstream side of the axial fan 20 in the flow, and performs heat exchange between the refrigerant circulating in the interior and the air, and the axial fan 20 on the downstream side of the axial fan 20 in the air flow. A blow grill 30 that is disposed to face and blows air to the outside, and the blow grill 30 is viewed in a direction parallel to the central portion A facing the boss 24 and the rotation axis R of the axial fan 20. It has the outer peripheral part C located in the outer peripheral side rather than the rotation locus | trajectory 25a of the wing | blade 25, and the intermediate part B located between the center part A and the outer peripheral part C, and at least the center part A is circular shape. It is composed of a linear member having a cross-sectional shape of A virtual plane perpendicular to the rotation axis R and intersecting a part of the blade 25 is defined as a reference plane 50, a distance between the intermediate portion B and the reference plane 50 is defined as a first distance L1, and the central portion A and the reference plane 50 are Is the second distance L2, and the distance between the outer peripheral portion C and the reference plane 50 is the third distance L3, the second distance L2 is longer than the third distance L3 and the first distance L1. Is shorter.

According to this configuration, since the distance between the blade 25 and the intermediate portion B of the blowout grill 30 can be increased, the air speed blown before the air blown by the axial fan 20 passes through the blowout grill 30. Can be reduced. Therefore, since the pressure fluctuation in the blowing grill 30 can be suppressed, the blowing sound 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 blowing grill 30 when 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 concave portion as shown by a thick arrow in FIG. Therefore, the wind speed distribution of the air blown from the blow grill 30 can be made uniform.

In the lower graph of FIG. 3, an example of the wind speed distribution of the air blown from the blow grill in the configuration of the comparative example is indicated by a broken line, and the wind speed distribution of the air blown from the blow grill 30 in the configuration of the present embodiment. The example is shown by a solid line. Here, in the configuration of the comparative example, the distance between the reference surface 50 and the blowing 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 from the blow grill 30 can be made uniform compared to the configuration of the comparative example. Therefore, since the wind speed in the area where the wind speed is relatively large can be reduced, the blowing sound of the outdoor unit 100 can be reduced.

Moreover, according to said structure, since at least center part A of the blowing grill 30 is comprised by the linear member which has circular cross-sectional shape, it reduces the ventilation resistance with respect to the air which passes the center part A. Can do. Therefore, the blowing sound of the outdoor unit 100 can be reduced.

Moreover, in the outdoor unit 100 of the air conditioner according to the present embodiment, the intermediate portion B has a region B1 in which the distance from the reference surface 50 is constant in a direction parallel to the radial direction of the axial fan 20. And the distance between the area B <b> 1 and the reference surface 50 may be the longest on the blowout grill 30.

According to this configuration, the air flow can be diffused without concentrating in the region B1 that protrudes most downstream in the blowing grill 30. Therefore, since the wind speed of the air passing through the blowing grill 30 can be made more uniform, the blowing sound of the outdoor unit 100 can be further reduced. If the region B1 does not exist in the intermediate part B (that is, when the distance between the intermediate part B and the reference surface 50 is locally the longest in the direction parallel to the radial direction of the axial fan 20), The air flow is concentrated on the portion having the longest distance from the reference surface 50. Thereby, since a wind speed raises locally, the ventilation sound of the outdoor unit 100 may become difficult to be reduced.

Moreover, 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 region B1 may overlap the rotation locus 25a of the blade 25.

Moreover, in the outdoor unit 100 of the air conditioner according to the present embodiment, the central part A, the intermediate part B, and the outer peripheral part C (for example, the entire blow grill 30) are constituted by a plurality of steel wires or resin grids. May be.

10 casing, 11 partition plate, 12 fan room, 13 machine room, 14 compressor, 15 vent hole, 16 opening, 17 bell mouth, 20 axial fan, 21 heat exchanger, 22 motor, 22a output shaft, 23 Impeller, 24 Boss, 25 Wings, 25a Rotation locus, 30 Outlet grill, 31 Outer frame, 32 Inner frame, 33 Radial part, 34 Central part, 41, 42 Border, 43 Inner edge, 44 Outer edge, 50 reference planes, 100 outdoor units, A central part, B intermediate part, B1 area, C outer peripheral part, R rotation axis.

Claims

An axial fan having a boss and blades arranged on the outer periphery of the boss, and blowing air;
A heat exchanger that is arranged upstream of the axial fan in the flow of air and performs heat exchange between the refrigerant circulating in the interior and the air;
A blow-off grill that is arranged on the downstream side of the axial fan in the flow of air and that faces the axial fan, and blows air to the outside;
With
The blowing grill is
A central portion facing the boss;
An outer peripheral portion located on the outer peripheral side of the rotational trajectory of the blades when viewed in a direction parallel to the rotational axis of the axial fan;
An intermediate portion located between the central portion and the outer peripheral portion,
At least the central part is constituted by a linear member having a circular cross-sectional shape,
A virtual plane perpendicular to the rotation axis and intersecting a part of the wing is used as a reference plane,
The distance between the intermediate portion and the reference surface is a first distance,
The distance between the central portion and the reference plane is a second distance,
When the distance between the outer peripheral portion and the reference surface is the third distance,
The 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 the distance from the reference surface is constant in a direction parallel to the radial direction of the axial fan,
The outdoor unit of the air conditioner according to claim 1, wherein the distance between the region and the reference surface is the longest in the blowout grill.
The outdoor unit for an air conditioner according to claim 2, wherein the entire region overlaps the rotation locus when viewed in a direction parallel to the rotation axis.
The outdoor unit for 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 configured by a plurality of steel wires or resin lattices.