WO2004088210A1

WO2004088210A1 - Outdoor unit for air conditioner

Info

Publication number: WO2004088210A1
Application number: PCT/JP2004/004426
Authority: WO
Inventors: Mitsuyoshi Ishijima; Akihiro Takeuchi
Original assignee: Toshiba Carrier Corporation
Priority date: 2003-03-31
Filing date: 2004-03-29
Publication date: 2004-10-14
Also published as: JP2004301451A; ES2332591T3; CN101025281A; EP1610068A4; CN100480591C; EP1610068B1; KR20050120678A; CN1768237A; EP1610068A1; CN100343590C; KR100724824B1

Abstract

An outdoor unit for an air conditioner has an axial-flow fan and a bell mouth. The axial-flow fan is constructed by arranging blades at predetermined intervals along the outer periphery of a hub, each of the blades being formed such that the outline of its rear edge relative to the rotational direction is recessed toward its front edge. The bell mouth is provided on the side of air blow by the axial-flow fan. An axial-flow blower is provided in the outdoor unit. The bell mouth and the axial-flow fan are arranged in the axial-flow blower such that a ratio X/L is in the range of 0.2-0.8 with X being the distance between that portion of the blade’s rear edge outline that is most deeply inwardly recessed in the rotating direction and an air outflow surface of the bell mouth, L being the axial length of bell mouth.

Description

Description Air conditioning equipment outdoor unit Technical field

The present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit provided with an axial blower capable of suppressing an increase in blowing noise. Background art

Conventionally, an outdoor unit of an air conditioner is provided with a bell mouth at an outlet, and a plurality of wings arranged at a predetermined interval along an outer peripheral surface of a rotary fan in an air inflow direction of the bell mouse. An axial blower having an axial fan provided therein is arranged.

In such an axial fan of an outdoor unit, air is blown in the axial direction as the axial fan rotates. At that time, the leading edge of the wing is in the air introduction direction, and the trailing edge of the wing is in the air outflow direction.

In recent years, due to the demand for increasing the amount of air to be blown and the demand for reducing the motor load, the corner where the leading edge of the blade and the outer periphery of the blade intersect greatly protrudes in the rotation direction, while the contour of the trailing edge is An axial fan formed in a concave shape in the air flow direction has been used (for example, Japanese Patent Application Laid-Open No. 2002-257080).

In the above axial flow fan, the generation of vortices generated in the wake of the trailing edge of the blade can be reduced as compared with the case where the trailing edge of the blade is formed in a straight line, thus reducing the blowing noise and the motor load. The effect of is obtained.

However, in the conventional axial flow fan, since the contour of the trailing edge of the blade is located in the direction of air introduction from the side edge of the air inlet surface of the bell mouth, the air flowing out of the trailing edge of the blade However, it collides with the peripheral end of the air inflow surface of the bell mouth to generate a vortex, which causes an increase in blast noise.

The present invention has been made in consideration of the above circumstances, and its purpose is to optimize the axial positional relationship between the trailing edge of the wing and the bellmouth to achieve rectification of the trailing edge of the wing, It is an object of the present invention to provide an outdoor unit of an air conditioner equipped with an axial blower capable of suppressing an increase in blowing noise. Disclosure of the invention

In the outdoor unit of the air conditioner of the present invention provided to achieve the above object, the wing having the contour of the wing trailing edge in the rotating direction formed in a concave shape in the wing leading edge direction is provided by a hub. An axial fan formed by arranging a plurality of them at predetermined intervals along an outer peripheral surface of the wing, and a bell mouth arranged on an air blowing side by the axial fan, wherein a contour of the wing trailing edge is provided. The distance (XZL) when the distance between the most concave portion inside the rotation direction of the line and the air outflow surface of the bell mouth and the length in the axial direction of the bell mouth are (XZL) is 0.2 to 0.2. The bell mouth and the axial fan are arranged so as to fall within a range of 0.8.

In addition, the above object is achieved by forming a plurality of blades, each having a contour of a trailing edge portion of the blade in the rotation direction formed in a concave shape in the direction of the leading edge of the blade, arranged at predetermined intervals along the outer peripheral surface of the hub. An outdoor unit of an air conditioner, comprising: an axial fan that is provided; and a bell mouth that is disposed on an air blowing side of the axial fan, wherein a contour in a circumferential direction of the wing and a contour in a trailing edge of the wing. The distance (YZL) when the distance between the point where the line intersects and the air outlet surface of the bell mouth is Y and the length of the bell mouth in the axial direction is L is 0.3 to 0.9. The present invention is also achieved by providing an outdoor unit of an air conditioner characterized by arranging the bell mouth and the axial flow fan in such a manner as to satisfy the following range.

In the above embodiment, it is preferable that the concave shape of the contour line of the trailing edge of the blade is an arc shape.

Further, the concave shape of the contour line of the wing trailing edge may be V-shaped or trapezoidal.

More preferably, an object of the present invention is to provide a wing in which the contour of the wing trailing edge in the rotational direction is formed in a concave shape in the wing leading edge direction, at a predetermined interval along the outer peripheral surface of the wing. An outdoor unit for an air conditioner, comprising: an axial fan formed by arranging a plurality of airflow fans; and a bell mouth disposed on an air blowing side by the axial fan, wherein the contour line of the blade trailing edge is rotated. The distance (XZL) is 0.2 to 0.8, where L is the distance between the air outlet surface of the bell mouth and the most concave part in the direction, and L is the axial length of the bell mouth. The distance between the intersection of the circumferential contour of the wing and the contour of the trailing edge of the wing and the air outflow surface of the bellmouth is defined as Y, The bell mouth is arranged so that the ratio (Y / L) when the length of the bell mouth in the axial direction is L is in the range of 0.3 to 0.9. Is achieved by providing the outdoor unit of an air conditioner which is characterized in that scan and disposed between the axial flow fan. As described above, according to the present invention, in the outdoor unit of the air conditioner, by setting the positional relationship between the blade of the axial fan and the bell mouth to an optimal value, the request of the air flow and the load of the motor load are reduced. To provide an outdoor unit of an air conditioner equipped with an axial blower that can reduce the blowing noise by suppressing the vortex generated at the trailing edge of the blade of the axial flow fan while satisfying the demand for reduction be able to. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic sectional view of an outdoor unit of an air conditioner according to the present invention.

FIG. 2 is a plan view showing the entire configuration of the axial flow fan according to the present invention when viewed from the pressure side of the blade.

FIG. 3 is an enlarged view of one blade of the axial flow fan as the first embodiment of the present invention shown in FIG.

FIG. 4 is a diagram showing a positional relationship between the axial fan and the bell mouth in the first embodiment.

FIG. 5 is a diagram showing the relationship between the ratio (XZL) and the blowing noise in the first embodiment (the most concave point of the contour of the trailing edge of the blade of the axial flow fan and the air outflow surface of the bell mouth). Is defined as X, and the length of Bellmouth in the axial direction is defined as L).

FIG. 6 is an enlarged view of one of the blades of an axial fan according to a modification of the first embodiment.

FIG. 7 is an enlarged view of one of the blades of an axial fan according to another modification of the first embodiment.

FIG. 8 is a diagram showing the relationship between the ratio (YZL) and the blowing noise according to the second embodiment of the present invention (the circumferential contour of the blade of the axial flow fan and the contour of the trailing edge of the blade). The distance between the intersection of the line and the air outlet surface of Bellmouth is Y, and the axial length of Bellmouth is L.) BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 is a sectional view of an outdoor unit (unit) 1 of an air conditioner.

The outdoor unit 1 is used by being connected to an indoor unit (unit) (not shown), and a bottom plate 2 disposed on the outdoor floor surface, a component described later disposed on the bottom plate 2, an outlet 4, It has a fan guard 5 that covers the outlet 4, And a main body cover 3 provided to cover the main body 2.

The outdoor unit 1 has therein a compressor 6 that circulates a refrigerant through a refrigeration cycle and an outdoor heat exchanger in which plate-shaped radiating fins are stacked at predetermined intervals in a heat transfer tube through which the refrigerant flows. 7 has a refrigeration cycle component, a blower 8 for sending outdoor air to the outdoor heat exchanger 7, and a bell mouth 9 provided at the outlet 4.

The blower 8 includes an axial fan 10 and a fan motor 11, and is provided between the outdoor heat exchanger 7 and the bell mouth 9 in the axial direction.

The fan motor 11 is attached to a motor fixing plate 11 a provided on the bottom plate 2 with a fixing tool such as a screw.

Here, the above components are arranged in order from the upstream side of the air flow generated by the axial fan 10, in the order of the outdoor heat exchanger 7, the fan motor 11, the axial fan 10, and the bell mouth 9. Are arranged side by side in the axial direction.

FIG. 2 is a plan view showing the overall configuration of the axial flow fan 10 of the present invention when viewed from the pressure side of the blade 10b. FIG. 3 is a plan view showing one blade 10b of FIG. FIG.

The axial flow fan 10 according to the first embodiment of the present invention shown in FIGS. 2 and 3 has a plurality of blades 10b equally divided in the circumferential direction on a side surface of an outer peripheral surface of a cylindrical bush 10a. It is not integrated at the position or is integrally attached, and is integrally molded by, for example, resin molding.

The rotation shaft of the fan motor 11 is inserted and fixed at the center of the hub 10a, and the axial fan 10 is rotated in the direction of arrow M by the fan motor 11. The portion of the wing 10b connected to the hap 10a is integrally formed as a root portion 20, and the rotation direction (M) is on the front side of the wing front edge 21 and on the rear side in the rotation direction. The wing trailing edge 22 and the wing leading edge 22 and the wing trailing edge 22 are formed as a wing outer peripheral portion 23, respectively.

Also, based on the flow of air on the wing 10 b accompanying the rotation of the axial fan 10, the leading edge 21 of the wing is the direction of air introduction, and the trailing edge 22 of the wing is air. Outflow direction (Fig. 3).

The leading edge 21 of the blade protrudes greatly in the rotational direction from the root portion 20 toward the outer peripheral portion 23 of the blade, and the contour of the trailing edge 22 of the blade is opposite to the air outflow direction. It is formed as an arc-shaped recess that is recessed in the introduction direction.

Then, a corner portion which is a continuous portion (intersection) between the wing rear portion 22 and the outer peripheral portion 23 is It is formed as a convex bulging portion 24 bulging in the air outflow direction.

By the rotation of the axial fan 10, air is sucked into the outdoor unit, and is discharged from the fan guard 5 to the outside of the outdoor unit 1 via the outdoor heat exchanger 7, the axial fan 10, and the bellmouth 9 in this order. .

FIG. 4 is a view showing a positional relationship between the axial fan 10 and the bell mouth 9 in the first embodiment, and the bell mouth 9 is provided around the outlet 4 of the cover 13 of the main body. In the axial direction of the axial fan 10, it faces the trailing edge 22 of the blade.

Here, the wing trailing edge 22 of the wing 10b is arranged so that its G point and Q point completely wrap (enter the bell mouth) with the bell mouth 9 in the axial direction.

Fig. 5 shows that the distance between the point G of the wing trailing edge 22 of wing 10b in FIG. FIG. 3 is a diagram showing a relationship between a ratio (X / L) when the length in the axial direction is L and blast noise. As shown in FIG. 5, the length X from the point G of the trailing edge 22 of the wing to the bellmouth air outflow surface 9 b is approximately 20% of the axial length L of the bellmouth 9 to 80%. % (0.2 L to 0.8 L), the ventilation noise is reduced by placing the axial fan 10 and bell mouth 9, especially at around 50%. Therefore, it has been experimentally found that setting X in the above range is effective for reducing blast noise. The experiment for this was carried out based on the JIS standard (Z8731) by installing the outdoor unit in an anechoic room and installing a microphone connected to the sound level meter at a position lm from the front of the outdoor unit. Was. The blast noise through the microphone was displayed on the sound level meter as sound pressure level (dB).

As a result, it is possible to suppress the vortex generated by the air flowing out from the wing trailing edge 22 colliding with the peripheral end of the air inflow surface 9 a of the bell mouth 9, and reduce the blowing noise caused by this vortex. Can be reduced.

Next, a modification of the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described.

The parts of the first modification shown in FIG. 6 are different from the shape of the wing trailing edge part 22 in the first embodiment of FIG. 3, but the same parts as the other parts are indicated by the same reference numerals, and The description is omitted.

In this modification, the contour of the rear edge 22 of the axial fan used in the first embodiment is formed as an axial fan formed in a substantially V-shaped concave portion.

As shown in FIG. 6, the axial flow fan 10 has an airflow It is formed as a substantially V-shaped recess recessed in the introduction direction opposite to the exit direction. Here, the V-shaped vertex Z corresponds to the point G of the arc-shaped concave portion in the first embodiment, and the point Q at which the V-shaped trailing edge portion 22 and the blade outer peripheral portion 23 intersect with each other. 1 corresponds to the point Q in the first embodiment.

An experiment similar to that of the first embodiment was performed using an axial fan having such a shape, and an effect equivalent to that of the first embodiment was obtained.

Next, a second modified example of the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described with reference to FIG.

Although each part of the second modified example is different from the shape of the wing trailing edge portion 22 of the first embodiment in FIG. 3, the same parts as those of the other parts are denoted by the same reference numerals, and description thereof will be omitted. In this modification, the contour of the trailing edge portion 22 of the blade of the axial flow fan used in the first embodiment is formed as an axial flow fan formed as a trapezoidal concave portion.

As shown in FIG. 7, the axial flow fan 10 is formed such that the contour of the trailing edge 22 of the blade is a trapezoidal concave portion that is concave in the direction of introduction opposite to the direction of air flow.

Here, the trapezoidal side U corresponds to the point G in the first embodiment, and the point Q2 where the trailing edge 22 of the trapezoid intersects with the blade outer periphery 23 is the point Q2 in the first embodiment. Corresponds to point Q in the example.

An experiment similar to that of the first embodiment was performed using the axial fan in such a shape, and the same effect as that of the first embodiment was obtained.

Next, a second embodiment of the outdoor unit of the air conditioner according to the present invention will be described. Regarding the components of the second embodiment, the same components as those of the first embodiment of FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.

In the second embodiment, as shown in FIG. 4, the bulging portion 24 of the wing 10b is arranged so as not to protrude from the air outflow surface 9b of the bell mouth 9 in the axial direction. FIG. 8 relates to the second embodiment, and designates a point where a blade outer peripheral portion 23 of the blade 10b intersects with the trailing edge 22 of the blade, as a point Q. FIG. 7 is a diagram showing a relationship between a ratio (YZL) when a distance from the outflow surface 9 b to Y and an axial length of the bellmouth 9 to L (blast noise).

As shown in FIG. 8, the length Y from the point Q of the wing trailing edge 22 to the bellmouth air outflow surface 9 b is about 30% to 90% of the axial length L of the bellmouth 9. % (0.3 L to 0.9 L), the ventilation noise is reduced by arranging the axial fan 10 and bell mouth 9, especially at around 60%. And within the above range Experimentally, it has been found that setting Y is effective in reducing blast noise. This experiment was also performed under the same conditions as those performed in the first example. As a result, it is possible to suppress the vortex generated when the air flowing out of the bulging portion 24 collides with the fan guard 5 on the downstream side of the axial fan 10, and the blowing noise caused by the vortex is reduced. Can be reduced.

Furthermore, in a further preferred embodiment of the present invention, as shown in FIG. 4, the relationship (ratio) between X and L in the first embodiment and the relationship between Υ and L in the second embodiment are shown. It goes without saying that the noise reduction effect is further increased according to the embodiment in which the design satisfies both the relations (ratio). Industrial applicability

As described above, according to the present invention, the outdoor unit of the air conditioner satisfies the requirements of the air flow rate and the requirement of the reduction of the motor load, and generates the vortex generated at the trailing edge of the blade of the axial flow fan. It is possible to provide an outdoor unit of an air conditioner that is provided with an axial blower capable of suppressing and reducing the blowing noise.

Claims

The scope of the claims

1. An axial flow formed by arranging a plurality of blades with the contour of the trailing edge of the blade in the direction of rotation concave in the direction of the leading edge of the blade at predetermined intervals along the outer peripheral surface of the hub An outdoor unit of an air conditioner, comprising: a fan; and a bell mouth disposed on an air blowing side of the axial fan, wherein the bell mouth is a portion that is most concavely inward in a rotation direction of a contour of the wing trailing edge. The distance between the bell mouth and the bell mouth is defined such that the distance (XZL) when the distance between the bell mouth and the axial direction of the bell mouth is L is in the range of 0.2 to 0.8. An outdoor unit of an air conditioner, comprising an axial fan.

2. The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the contour line of the trailing edge of the blade is an arc shape.

3. The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the contour line of the wing trailing edge is a V shape.

4. The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the contour line of the trailing edge of the wing is trapezoidal.

5. Axial fan formed by arranging a plurality of blades whose contours at the trailing edge in the rotation direction are concave toward the leading edge of the blade at predetermined intervals along the outer peripheral surface of the hub An outdoor unit of an air conditioner including a bell mouth disposed on an air blowing side by the axial flow fan, wherein a contour line in a circumferential direction of the wing intersects a contour line in a trailing edge portion of the wing. The distance (YZL) when the distance between the point of the bell mouth and the air outlet surface of the bell mouth is Y and the length of the bell mouth in the axial direction is L is in the range of 0.3 to 0.9. An outdoor unit of an air conditioner, wherein the bell mouth and the axial fan are arranged.

6. The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the contour line of the trailing edge of the blade is an arc shape.

7. The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the contour of the wing trailing edge is a V shape.

8. The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the contour of the trailing edge of the blade is trapezoidal.

9. Axial flow formed by arranging a plurality of wings with the contour of the trailing edge in the rotation direction concave in the leading edge direction at predetermined intervals along the outer circumferential surface of the wing An outdoor unit of an air conditioner, comprising: a fan; and a bell mouth arranged on an air blowing side by the axial flow fan, wherein the bell mouth is a part that is most concave inside a contour line of the wing trailing edge in a rotation direction. The distance (X / L) assuming that the distance between the bell mouth and the air outflow surface is X and the axial length of the bell mouth is L is in the range of 0.2 to 0.8, and The distance between the intersection of the contour of the wing in the circumferential direction and the contour of the trailing edge of the wing and the air outflow surface of the bellmouth is Y, and the axial length of the bellmouth is L. The bell mouth and the axial fan are arranged such that the ratio (Y / L) of the bell mouth is in the range of 0.3 to 0.9. Outdoor unit for an air conditioner characterized.