CN1768237A - Air conditioner outdoor unit - Google Patents

Abstract

The invention discloses an outdoor unit of an air conditioner, which is provided with an axial flow fan and a bell mouth. The axial flow fan is configured by arranging blades at predetermined intervals along the outer periphery of a hub, each of the blades being formed such that a contour line of a rear edge portion thereof with respect to a rotation direction is recessed toward a front edge thereof. The bell mouth is provided at the blowing side of the axial flow fan. An axial flow fan 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 a range of 0.2 to 0.8, where X is a distance between a portion on a rear edge contour line of the blade that is recessed deepest inward in a rotational direction and an air outflow surface of the bell mouth, and L is an axial length of the bell mouth.

Description

Air conditioner outdoor unit

technical field

The invention relates to an outdoor unit of an air conditioner, in particular to an outdoor unit equipped with an axial flow blower capable of suppressing the noise of the blower.

Background technique

In the conventional art, an outdoor unit of an air conditioner is constructed such that a bell mouth is connected to a discharge port, and an axial flow blower is arranged in the bell mouth along the air inflow direction, and the axial flow blower has a multi- An axial fan with two blades arranged at predetermined intervals along the outer peripheral surface of a rotating hub.

In the axial flow fan of the above outdoor unit, when air is blown in the axial direction by the rotation of the axial flow fan, the front edge portion of the blade corresponds to the air introduction direction, and the rear edge of the blade corresponds to the air introduction direction. The edge portion corresponds to the air outflow direction.

In recent years, in order to meet the demand for increasing the blowing air volume and reducing the load on the motor, there has been provided an axial flow fan in which the front edge portion of the blade meets the outer peripheral portion of the blade The corner portion at is projected strongly toward the rotation direction side, and the outline of the blade rear edge portion is formed into a concave shape in the air inflow direction (for example, Japanese Patent Application Laid-Open Document No. 2002-257088).

In the above-mentioned axial flow fan, compared with the case where the rear edge portion of the blade is formed in an approximately linear shape, the vortex generated in the trailing side of the blade rear edge portion can be reduced, and therefore, reduction in blower noise can be achieved. and reduce the motor load.

However, in a conventional axial flow fan, since the contour line of the rear edge of the blade is located in the air introduction direction from the side peripheral end of the air inflow surface of the bell mouth, the air flows out from the rear edge of the blade. The air collides with the outer peripheral end of the air inflow surface of the bell mouth, thereby generating a vortex, thereby increasing the noise of the blower.

Contents of the invention

The above situation was considered when the present invention was conceived. The purpose of the present invention is to provide an outdoor unit of an air conditioner, which is provided with an axial blower. The present invention intends to adjust the axial position relationship between the rear edge of the blade and the bell mouth. The rear edge portion of the blade, thereby, can reduce blower noise.

In order to achieve the above object, according to the present invention, there is provided an outdoor unit of an air conditioner, which includes: an axial flow fan, which is provided with a plurality of blades arranged at predetermined intervals along the outer peripheral surface of the hub, each of the The blades each have a contoured blade rear edge portion in the direction of rotation to provide a concave shape that is concave toward the direction of the blade front edge; and a bell mouth is arranged on the blowing side of the axial fan, Wherein, the bell mouth and the axial flow fan are arranged so that the ratio (X/L) is in the range of 0.2 to 0.8, where X is the distance along the contour line of the rear edge of the blade. The distance between the deepest concave part that is concave inward in the direction of rotation and the air outflow surface of the bell mouth, L is the axial length of the bell mouth.

The above objects can also be achieved by providing an outdoor unit of an air conditioner, which includes: an axial fan provided with a plurality of blades arranged at predetermined intervals along the outer peripheral surface of the hub, each of the blades at There is a blade rear edge portion with a contour line in the direction of rotation to provide a concave shape concave toward the direction of the blade front edge; and a bell mouth, which is arranged on the blowing side of the axial flow fan, wherein, The bell mouth and the axial fan are arranged such that a ratio (Y/L) is in the range of 0.3 to 0.9, where Y is the contour line in the circumferential direction of the blade and the rear edge portion of the blade The distance between the intersection point of the contour lines and the air outflow surface of the bell mouth, L is the axial length of the bell mouth.

In the above embodiment, it is desirable that the concave shape of the contour line of the trailing edge portion of the blade is arc-shaped.

The concave shape of the outline of the trailing edge of the blade may also be V-shaped or trapezoidal.

More preferably, the above object of the present invention is achieved by providing an outdoor unit of an air conditioner, which includes: an axial flow fan provided with a plurality of blades arranged at predetermined intervals along the outer peripheral surface of the hub, Each of the blades has a contoured blade rear edge portion in the direction of rotation to provide a concave shape that is concave toward the direction of the blade front edge; The blast side, wherein the bell mouth and the axial fan are arranged such that the ratio (X/L) is in the range of 0.2 to 0.8, where X is the contour line of the trailing edge portion of the blade The distance between the deepest concave part that is recessed inward along the direction of rotation and the air outflow surface of the bell mouth, L is the axial length of the bell mouth; and, wherein, the bell mouth and the The axial fan is arranged so that the ratio (Y/L) is in the range of 0.3 to 0.9, where Y is the point at which the contour line in the circumferential direction of the blade intersects the contour line of the rear edge portion of the blade The distance from the air outflow surface of the bell mouth, L is the axial length of the bell mouth.

As described above, according to the present invention, it is possible to provide the above-mentioned outdoor unit of the air conditioner, which is provided with such an axial flow blower, that is, by connecting the axial flow fan and the bell mouth in the outdoor unit of the air conditioner, Setting the positional relationship among them to an optimum value can meet the requirements of both the blowing speed and the reduction of the motor load, and can suppress the generation of eddy currents in the blade rear edge portion of the axial flow fan, and, Reduces blower noise.

Description of drawings

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

Fig. 2 is the overall structural diagram of the axial flow fan of the present invention when viewed from the side of the positive pressure surface of the blade;

3 is an enlarged view showing one blade of the axial fan shown in FIG. 2 according to the first embodiment of the present invention;

Fig. 4 shows the positional relationship between the axial flow fan and the bell mouth in the first embodiment;

Fig. 5 is a graph showing the relationship between the ratio (X/L) and blower noise in the first embodiment (where X is the deepest point on the contour line of the blade trailing edge of the axial flow fan The distance between the concave point and the air outflow surface of the bell mouth, L is the axial length of the bell mouth);

6 is an enlarged view showing one blade of an axial fan according to a first modified embodiment of the first embodiment;

7 is an enlarged view showing one blade of an axial fan according to another modified embodiment of the first embodiment; and

Fig. 8 is a graph showing the relationship between the ratio (Y/L) and blower noise according to the second embodiment of the present invention (wherein, Y is the circumferential direction of the blade of the axial flow fan The distance between the intersection point of the contour line and the contour line of the rear edge of the blade and the air outflow surface of the bell mouth, L is the axial length of the bell mouth).

Detailed ways

Next, an embodiment according to the present invention will be described with reference to FIGS. 1 to 8 .

FIG. 1 is a cross-sectional view of an outdoor unit 1 of an air conditioner.

The outdoor unit 1 is used in a state connected to an indoor unit (not shown), and consists of a bottom plate 2 arranged on the outdoor ground, later-mentioned structural members or parts arranged on the bottom plate 2, a discharge port 4 and a main body cover 3 having a fan cover 5 and covering the structure and the bottom plate 2, wherein the fan cover 5 covers the discharge opening 4.

The outdoor unit 1 is provided with a compressor 6 , a refrigeration cycle, a blower 8 and a bell mouth 9 , wherein the compressor 6 circulates the refrigerant in the refrigeration cycle including an outdoor heat exchanger 7 , in the outdoor heat exchanger 7, plate-shaped heat radiation fins are stacked at predetermined intervals in one heat exchange pipe through which the coolant flows, and the blower 8 is used to supply outdoor air to the outdoor heat exchanger 7, so The bell mouth 9 as the structural element is formed inside it as the discharge opening 4 .

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

The fan motor 11 is mounted on a motor fixing plate 11 a mounted on the bottom plate 2 by a fixing member such as a screw or the like.

In this case, the structures or parts are arranged side by side in the axial direction of the motor from the upstream side of the air generated by the axial fan 10 in the following order: outdoor heat exchanger 7, fan motor 11, axial fan fan 10 and bell mouth 9,

2 is a plan view showing the overall structure of the axial flow fan 10 according to the present invention viewed from the positive pressure surface side of the blade 10b, and FIG. 3 is an enlarged view showing one blade 10b in FIG.

In the axial flow fan 10 of the first embodiment of the present invention shown in FIGS. 2 and 3, a plurality of blades 10b are aligned with the cylindrical hub 10a at positions evenly spaced in the circumferential direction of the cylindrical hub 10a. The side surfaces of the outer peripheral surface of the body are integrally formed or integrally connected, and are integrally formed, for example, by resin molding or the like.

The rotation shaft of the fan motor 11 is inserted and then fixed on the central portion of the hub 10a, and the axial fan 10 is rotated in the direction of arrow M by the fan motor 11.

The blade 10b has a root portion 20 integrally connected to the hub 10a. Also, the front side in the rotation direction (M) of the blade 10b is formed as a blade front edge portion 21, the rear side in the rotation direction is formed as a blade rear edge portion 22, and is connected to the outer peripheral end of the blade front edge portion 21. The end portion at which both the blade rear edge portion 22 and the outer peripheral end portion of the blade trailing edge portion 22 are connected is formed as the blade outer peripheral portion 23 .

Furthermore, regarding the airflow on the blade 10b generated by the rotation of the axial fan 10, the blade front edge portion 21 corresponds to the air introduction direction, and the blade rear edge portion 22 corresponds to the air outflow direction (FIG. 3).

The blade front edge portion 21 protrudes strongly from the root portion 20 toward the blade outer peripheral portion 23 in the rotation or turning direction, and the outline of the blade rear edge portion 22 is formed to be concave in the introduction direction opposite to the air outflow direction. Arc-shaped concave part.

Also, a corner portion corresponding to a connection portion (intersection portion) between the blade rear edge portion 22 and the blade outer peripheral portion 23 is formed as a convex portion 24 that protrudes in the air outflow direction.

Air is sucked into the interior of the outdoor unit by the rotation of the axial fan 10 , passes through the outdoor heat exchanger 7 , the axial fan 10 and the bell mouth 9 , and then is discharged from the fan cover 5 to the outside of the outdoor unit 1 .

FIG. 4 shows the positional relationship between the axial fan 10 and the bell mouth 9 in the first embodiment. The bell mouth 9 is provided around the discharge port 4 of the main body cover 3 and is opposed to the blade rear edge portion 22 in the axial direction of the axial fan 10 .

In this case, the blade trailing edge portion 22 of the blade 10b is arranged such that its points G and Q completely overlap the bell mouth 9 in the axial direction and thus will be located in said bell mouth.

FIG. 5 is a graph showing the relationship between the ratio (X/L) and the blower noise, wherein the point G on the blade rear edge portion 22 of the blade 10b that is recessed the deepest inward along the direction of rotation is the same as that of the graph. The distance between the air outflow surfaces 9b of the bell mouth 9 in 4 is X, and the axial length of the bell mouth 9 is L.

As shown in FIG. 5 , by arranging the axial fan 10 and the bell mouth 9 within the following range, that is, the length X from the point G of the rear edge portion 22 of the blade to the air outflow surface 9 b of the bell mouth is within the length X of the bell mouth 9 In the range of about 20% to 80% (0.2L to 0.8L) of the axial length L, the blower noise can be reduced, and in particular, when the length X is close to 50% of the length L, the blower noise becomes minimal . Therefore, it is known from experiments that setting the length X within the above range can effectively reduce the blower noise. Experiments for obtaining this knowledge have been performed based on JIS (Z 8731) by installing the outdoor unit in an anechoic chamber and placing a microphone connected to a noise meter at a position 1 m from the front surface of the outdoor unit. The blower noise through the microphone is displayed on the noise meter in sound pressure level (dB).

Therefore, the generation of eddy currents can be suppressed by collision of the air flowing out from the blade rear edge portion 22 with the outer peripheral end portion of the air inflow surface 9a of the bell mouth 9, thereby reducing blower noise caused by the eddy currents.

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

Although the shape of the blade trailing edge portion of the first modified embodiment shown in FIG. 6 is different from that of the blade trailing edge portion 22 of the first embodiment in FIG. 3 , other identical or identical parts are represented in the same drawing marks, and their detailed descriptions are omitted.

In the modified embodiment, the outline of the blade rear edge portion 22 of the axial fan is different from that of the first embodiment, and the axial fan is formed with an approximately V-shaped concave portion.

As shown in FIG. 6 , the axial fan 10 is provided with a blade rear edge portion 22 having a contour line of an approximately V-shaped concave portion concave in an introduction direction opposite to an air outflow direction.

In this case, the apex Z of the V-shape corresponds to the point G of the arc-shaped concave portion in the first embodiment, and the point Q1 at the intersection of the V-shaped blade rear edge portion 22 and the blade peripheral portion 23 is the same as that of the first embodiment. Corresponding to point Q in .

In the experimental results obtained by conducting the same experiment as the first embodiment using the axial fan having the shape of the first modified example described above, the same results as the first embodiment were obtained.

Next, a second modified embodiment of the outdoor unit of the air conditioner according to the first embodiment of the present invention will be described next with reference to FIG. 7 .

Although the shape of the blade trailing edge portion of the second modified embodiment shown in FIG. 7 is different from that of the blade trailing edge portion 22 of the first embodiment in FIG. 3 , other identical or identical parts are represented in the same drawing marks, and their detailed descriptions are omitted.

In the second modified embodiment, the outline of the blade rear edge portion 22 of the axial fan is different from that of the first embodiment, and the axial fan is formed with a trapezoidal concave portion.

As shown in FIG. 7 , the axial fan 10 is provided with a blade rear edge portion 22 having an outline of an approximately trapezoidal concave portion that is concave in an introduction direction opposite to an air outflow direction.

In this case, the straight portion U of the trapezoid corresponds to the point G in the first embodiment, and the point Q2 where the trapezoidal blade rear edge portion 22 meets the blade outer peripheral portion 23 corresponds to the point Q in the first embodiment.

In the experimental results obtained by conducting the same experiment as the first embodiment using the axial flow fan having the shape of the second modified example described above, the same results as the first embodiment were obtained.

Next, an outdoor unit of an air conditioner according to a second embodiment of the present invention will be described next.

In the second embodiment, the same parts as those of the first embodiment shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In the second embodiment, compared with the structure shown in FIG. 4 , the protrusion 24 of the blade 10 b is arranged not to protrude from the air outflow surface 9 b of the bell mouth 9 in the axial direction.

8 relates to the second embodiment, which is a graph showing the relationship between the ratio (Y/L) and blower noise, where the point where the blade outer peripheral portion 23 of the blade 10b meets the blade rear edge portion 22 Let point Q be, the distance between point Q and the air outflow surface 9b of the bell mouth 9 be Y, and the axial length of the bell mouth 9 be L.

As shown in FIG. 8 , by arranging the axial fan 10 and the bell mouth 9 in the following range, that is, the length Y from the point Q of the rear edge portion 22 of the blade to the air outlet surface 9 b of the bell mouth is within the length Y of the bell mouth 9 In the range between about 30% and 90% (0.3L to 0.9L) of the axial length L, the blower noise can be reduced, in particular, when the length Y is close to 60% of the length L, the blower noise becomes minimum . Therefore, it has been found through experiments that setting the length Y within the above range can effectively reduce blower noise. The experiment was carried out under the same conditions as in the first example.

As described above, therefore, the generation of eddy currents can be suppressed by the collision of the air flowing out from the protruding portion 24 with the fan case 5 at the rear side of the axial fan 10, and thus, the blower noise generated by the eddy currents can also be reduced.

Moreover, in another preferred embodiment of the present invention, for example, it is designed to satisfy the relationship (ratio) between the values X and L in the first embodiment shown in FIG. 4 and the value in the second embodiment at the same time. In the example of the relationship (ratio) between the values Y and L, it goes without saying that the noise reduction effect can be enhanced.

Industrial Applicability

As described above, according to the present invention, it is possible to provide an outdoor unit of an air conditioner, which is provided with an axial blower capable of satisfying both the blowing speed and the reduction of the motor load, and furthermore, the axial flow fan Generation of eddy currents in the rear edge portion of the blade can be suppressed, and blower noise can be effectively reduced.

Claims (9)

1. the off-premises station of an air-conditioning comprises:

A tube-axial fan, it is provided with the blade of a plurality of outer peripheral faces along hub with arranged at predetermined intervals, and each described blade all has a blade rear edge portion with outline line on gyratory directions, to provide to the recessed concave shape of blade leading edge direction; And

A horn mouth, it is arranged in the air blast side of described tube-axial fan,

Wherein, described horn mouth and described tube-axial fan are positioned to ratio (X/L) are in 0.2 to 0.8 the scope, wherein, X be on the described outline line of described blade rear edge portion along recessed to the inside the darkest recess of gyratory directions and the distance between the described bell-mouthed air effluent face, L is described bell-mouthed axial length.

2. the off-premises station of air-conditioning as claimed in claim 1 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is a circular arc.

3. the off-premises station of air-conditioning as claimed in claim 1 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is a V-arrangement.

4. the off-premises station of air-conditioning as claimed in claim 1 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is trapezoidal.

5. the off-premises station of an air-conditioning comprises:

A tube-axial fan, it is provided with the blade of a plurality of outer peripheral faces along hub with arranged at predetermined intervals, and each described blade all has a blade rear edge portion with outline line on gyratory directions, to provide to the recessed concave shape of blade leading edge direction; And

A horn mouth, it is arranged in the air blast side of described tube-axial fan,

Wherein, described horn mouth and described tube-axial fan are positioned to ratio (Y/L) are in 0.3 to 0.9 the scope, wherein, Y is the point of outline line confluce of outline line on the circumferencial direction of described blade and described blade rear edge portion and the distance between the described bell-mouthed air effluent face, and L is described bell-mouthed axial length.

6. the off-premises station of air-conditioning as claimed in claim 5 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is a circular arc.

7. the off-premises station of air-conditioning as claimed in claim 5 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is a V-arrangement.

8. the off-premises station of air-conditioning as claimed in claim 5 is characterized in that, the concave shape of the described outline line of described blade rear edge portion is trapezoidal.

9. the off-premises station of an air-conditioning comprises:

A tube-axial fan, it is provided with the blade of a plurality of outer peripheral faces along hub with arranged at predetermined intervals, and each described blade all has a blade rear edge portion with outline line on gyratory directions, to provide to the recessed concave shape of blade leading edge direction; And

A horn mouth, it is arranged in the air blast side of described tube-axial fan,

Wherein, described horn mouth and described tube-axial fan are positioned to ratio (X/L) are in 0.2 to 0.8 the scope, wherein, X be on the described outline line of described blade rear edge portion along recessed to the inside the darkest recess of gyratory directions and the distance between the described bell-mouthed air effluent face, L is described bell-mouthed axial length, and

Wherein, described horn mouth and described tube-axial fan are positioned to ratio (Y/L) are in 0.3 to 0.9 the scope, wherein, Y is the point of outline line confluce of outline line on the circumferencial direction of described blade and described blade rear edge portion and the distance between the described bell-mouthed air effluent face, and L is described bell-mouthed axial length.

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