JPH11118198A - Outdoor unit of air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor unit of an air conditioner manufactured at low cost and capable of demonstrating greater heat exchanging performance without increasing the size of the unit. SOLUTION: A body casing 1 comprises an air inlet 7 and an air discharge outlet 8 respectively provided on the back side and the front side thereof. A flat heat exchanger 2 is so provided as to cover the air inlet 7 and a propeller fan 3 is so provided in a ventilating room 5 as to face the air discharge outlet 8. The flat heat exchanger 2 is made a flat plate extending in a radial direction of the propeller fan 3 and installed side by side in the axial direction thereof. The thickness E of the propeller fan 3 is approximately over 1/2 of the depth B of the body casing 1. The diameter F of the propeller fan 3 is approximately over 90% of the width C of the ventilating room 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit of an air conditioner having a propeller fan and a heat exchanger in a main casing.

[0002]

2. Description of the Related Art FIG. 3 is a transparent plan view showing a schematic configuration of an outdoor unit of an air conditioner as described above. The main body casing 31 has a rectangular shape in a plan view, and the inside thereof is divided into a ventilation chamber 35 and a machine chamber 36 by a partition plate 34 extending in the front-rear direction (vertical direction in the figure). In the ventilation chamber 35, suction ports 37a and 37b are respectively formed on the back side (upper side in the figure) and the side surface (left side in the figure), and on the front side (lower side in the figure). An outlet 38 is formed. An L-shaped heat exchanger (hereinafter referred to as “L-bending heat exchanger”) 32 is disposed so as to cover the suction ports 37a and 37b from the inside. In other words, the L-bending heat exchanger 3 extends along substantially the entire surface of the suction port 37a on the rear side.
2 is located on the long side 39, and the short side 40 of the L-bending heat exchanger 32 is located along substantially the entire surface of the suction port 37b on the side. On the other hand, the outlet 38
, A propeller fan 33 is arranged. The propeller fan 33 is arranged so that its rotation axis extends in the front-rear direction, whereby the rotation plane is
It is formed along the suction port 38.

The dimensional relationship of the outdoor unit is as follows. First, the width A of the main body casing 31 itself is 6
90 mm and depth B is 290 mm. The width C of the ventilation chamber 35 formed in the main body casing 31 is 50
0 mm, and the thickness D of the L-bending heat exchanger 32 in the air flow direction is 38 mm. For these dimensions, the fan thickness (axial thickness) E of the propeller fan 33 is 14
0 mm, and its diameter F is 400 mm. That is, the fan thickness E of the propeller fan 33 is smaller than １ ／ of the depth B of the main body casing 31, and the diameter F thereof is 80% of the width C of the ventilation chamber 35.

In the above-described conventional air conditioner, with the above-described structure, when the propeller fan 33 rotates, outdoor air flows in from both the rear-side suction port 37a and the side-side suction port 37b. The inflowing outdoor air passes through the long side 39 and the short side 40 of the L-bending heat exchanger 32 to exchange heat, and then is blown out of the main body casing 31 through the outlet 38. And L as above
By using the bending heat exchanger 32, in the above-described conventional outdoor unit of the air conditioner, the heat exchange area can be increased and the heat exchange performance can be improved.

[0005]

In the conventional outdoor unit of the air conditioner, the heat exchange performance is improved by increasing the heat exchange area as described above. However, this heat exchange performance can also be improved by increasing the amount of air blown by the propeller fan 33. For example, if the diameter F and the rotation speed of the propeller fan 33 are the same, the heat exchange performance is improved by increasing the fan thickness E as much as possible. If the fan thickness E is the same as the number of rotations, the heat exchange performance is improved by increasing the diameter F of the propeller fan 33. However, in the outdoor unit, since the L-bending heat exchanger 32 is used as the heat exchanger, if the fan thickness E is increased, the short side 4
As a result, the flow rate of the outdoor air at 0 decreases. Due to the relationship between the blown air volume and the heat exchange area, there is a limit to the improvement of the heat exchange performance when the fan thickness E is increased to some extent. When the L-bending heat exchanger 32 as described above is used, the short side 40 is located on the side of the propeller fan 33. Therefore, it is difficult to improve the heat exchange performance by increasing the diameter F of the propeller fan 33 without increasing the width A of the main casing 31. Furthermore, using the L-bending heat exchanger 32 has a problem that the cost of the equipment is higher than using a flat heat exchanger (hereinafter, referred to as “flat heat exchanger”).

[0006] Therefore, the inventors of the present invention have the advantage of improving the heat exchange performance by increasing the heat exchange area by using an L-bending heat exchanger in the above-mentioned outdoor unit having a predetermined size. Careful consideration was given to whether there was, or whether it would be advantageous to improve the heat exchange performance by using a flat heat exchanger and increasing the airflow generated by the propeller fan. As a result, when the operation sound of the outdoor unit is constant, it is better to use the flat heat exchanger and improve the heat exchange performance by increasing the airflow generated by the propeller fan, and use the L-bending heat exchanger. They have obtained a new finding that it may be more advantageous than improving the heat exchange performance.

The present invention has been made to solve the conventional drawbacks based on the above-mentioned new knowledge, and an object of the present invention is to increase the heat exchange performance at low cost without increasing the size of the equipment. An object of the present invention is to provide an outdoor unit of an air conditioner that can be exhibited.

[0008]

According to the first aspect of the present invention, an outdoor unit of an air conditioner is provided with a heat exchanger 2 in a main body casing 1 having a suction port 7 and a blow port 8 so as to cover the suction port 7.
And a propeller fan 3 facing the air outlet 8. The outdoor air sucked from the air inlet 7 by the propeller fan 3 is passed through the heat exchanger 2, and is blown out from the air outlet 8. In the formed outdoor unit of the air conditioner, the propeller fan 3 has an axial dimension E of about 1/2 or more of a dimension B of the main casing 1 along the same direction. Is characterized in that it has a flat plate shape extending in the radial direction of the propeller fan 3 and is provided in parallel with the propeller fan 3 in the axial direction.

[0009] In the outdoor unit of the air conditioner of the first aspect,
The air flow generated by the propeller fan 3 is increased while effectively utilizing the heat exchange area of the heat exchanger 2, whereby the heat exchange performance can be improved without increasing the size of the main casing 1. . Further, since a flat heat exchanger is used, it is possible to reduce the cost of equipment while maintaining or improving the heat exchange performance.

According to a second aspect of the present invention, the propeller fan 3 is disposed in a ventilation chamber 5 formed in the main body casing 1 so that the axial direction thereof extends forward and backward. The radial dimension F is about 90% or more of the lateral dimension C of the ventilation chamber 5.

[0011] In the outdoor unit of the air conditioner according to the second aspect,
The radial dimension F of the propeller fan 3 is increased without interfering with the heat exchanger 2, whereby the propeller fan 3
It is possible to surely increase the amount of air generated by the above. Therefore, the heat exchange performance can be further improved without increasing the size of the main casing 1.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the outdoor unit of the air conditioner of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a transparent plan view showing a schematic configuration of the outdoor unit of the air conditioner as described above. Main body casing 1
Is a rectangular shape in plan view like the above-mentioned conventional outdoor unit,
The inside thereof is divided into a ventilation chamber 5 and a machine chamber 6 by a partition plate 4 extending in the front-rear direction (vertical direction in the figure). The ventilation chamber 5 has a suction port 7 on the rear side (upper side in the figure) and an air outlet 8 on the front side (lower side in the figure). The flat heat exchanger 2 is arranged so as to cover the suction port 7 from the inside, that is, close to the suction port 7 and along substantially the entire surface thereof. On the other hand, the propeller fan 3 is disposed in front of the outlet 8. The propeller fan 3 is arranged so that its rotation axis extends in the front-rear direction, whereby the rotation plane is formed by the suction port 8.
It is formed along.

Next, a specific dimensional relationship of the outdoor unit will be described. First, the width A of the main body casing 1 itself is 69.
0 mm and depth B is 290 mm. The width C of the ventilation chamber 5 formed in the main casing 1 is 500 mm, and the thickness D of the flat heat exchanger 2 in the air flow direction is 3 mm.
8 mm. These dimensions are substantially the same as those of the conventional outdoor unit. On the other hand, for these dimensions, the fan thickness (thickness in the axial direction) E of the propeller fan 3 is 150 to
155 mm and its diameter F is 450 mm.
That is, the fan thickness E of the propeller fan 3 is larger than １ ／ of the depth B of the main casing 1, and the diameter F thereof is 90% of the width C of the ventilation chamber 5.

FIG. 2 shows the heat exchange performance (coefficient of performance COP) in each of the case where the L-bending heat exchanger is used and the case where the flat heat exchanger is used, with respect to the fan thickness ratio, that is, with respect to the depth of the main casing. It is the figure which compared, changing the ratio of the fan thickness of a propeller fan under the condition that driving noise was constant. As shown in the figure, when the fan thickness ratio is about 1/2 or less, the heat exchange performance is larger when the L-bend heat exchanger is used than when the flat heat exchanger is used. This is because the heat exchange area of the L-bending heat exchanger is larger than the heat exchange area of the flat heat exchanger by the short side located on the side of the propeller fan. However, the heat exchange performance of the L-bending heat exchanger tends to be saturated as the fan thickness ratio increases. This is because, when the fan thickness ratio is increased to a certain degree or more, the amount of air blown by the propeller fan increases, while the airflow flowing on the short side of the L-bending heat exchanger located on the side of the propeller fan gradually increases. This is because the effective heat exchange area of the L-bending heat exchanger is reduced. On the other hand, when the flat heat exchanger is used, the heat exchange area does not decrease, so that the above-described saturation tendency does not occur. Further, when the fan thickness ratio is larger than about 1/2, under the same operating noise conditions, a larger heat exchange performance can be obtained by using the flat heat exchanger than by using the L-bending heat exchanger. Become like this is,
When the L-bending heat exchanger is used, the short side that does not effectively contribute to the heat exchange performance is located close to the side of the propeller fan. While the operating noise is significantly increased, when a flat heat exchanger is used, such a structure does not exist in the vicinity of the propeller fan, so that the operating noise is lower at the same blowing rate. Because. Therefore, under the condition of the same operating noise, the use of a flat heat exchanger
This means that the air flow rate of the propeller fan can be increased more than using the bending heat exchanger, and thus the heat exchange performance is also increased. In addition, when a flat heat exchanger is used, there is no structure in the main casing that is located close to the side of the propeller fan, so the blower volume can be further increased by increasing the diameter of the propeller fan. Can be increased.

In the outdoor unit of the air conditioner, the fan thickness ratio E / B is set to be larger than about 1/2. Therefore, the heat exchange performance obtained under the condition of the same operation noise is improved as compared with the case where the L-bending heat exchanger is used.
Moreover, the cost of the flat heat exchanger 3 is L-bending heat exchanger 3
Therefore, an outdoor unit having a larger heat exchange performance than the conventional example can be obtained at a lower cost. Further, in the conventional outdoor unit, the diameter F of the propeller fan 33 is limited to about 80% of the width C of the ventilation chamber 35, whereas the diameter F of the propeller fan 3 is limited in the above description.
Is about 90% of the width C of the ventilation chamber 5. As a result, the amount of air blown by the propeller fan 3 can be increased, and heat exchange performance higher than in the past can be reliably obtained. Further, although the heat exchange performance is improved by the above, the size of the main casing 1 does not need to be increased. Therefore, it is possible to obtain an outdoor unit which is low-cost and compact and has improved heat exchange performance as compared with the conventional example.

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be variously modified and implemented within the scope of the present invention. In particular, the above dimensions are merely examples, and can be changed as appropriate. For example, in the above description, the fan thickness ratio of the propeller fan 3 is larger than about 1/2. However, if the fan thickness ratio is set to about 1/2, it is possible to reduce the cost of equipment while maintaining the same heat exchange performance as the conventional example. it can. Further, in the above description, the diameter F of the propeller fan 3 is set to about 90% of the width C of the ventilation chamber 5, but the diameter F of the propeller fan 3 may be larger than this.

[0018]

According to the outdoor unit of the air conditioner of the first aspect, the air flow generated by the propeller fan is increased while effectively utilizing the heat exchange area of the heat exchanger, thereby increasing the size of the equipment. Therefore, it is possible to improve the heat exchange performance. Further, since a flat heat exchanger is used, it is possible to reduce the cost of equipment while maintaining or improving the heat exchange performance.

In the outdoor unit of the air conditioner according to claim 2,
The radial dimension of the propeller fan can be increased without interfering with the heat exchanger, thereby reliably increasing the amount of air blown by the propeller fan. Therefore, heat exchange performance can be further improved without increasing the size of the main body casing.

[Brief description of the drawings]

FIG. 1 is a transparent plan view showing a schematic configuration of an outdoor unit of an air conditioner of the present invention.

FIG. 2 is a graph comparing the heat exchange performance with respect to the fan thickness ratio under the condition that the operation sound is constant in the case where the L-bending heat exchanger is used and the case where the flat heat exchanger is used.

FIG. 3 is a transparent plan view showing a schematic configuration of an outdoor unit of a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body casing 2 Flat heat exchanger 3 Propeller fan 5 Ventilation room 7 Inlet 8 Outlet

Claims (2)

[Claims] 1. A heat exchanger (2) is provided in a main body casing (1) having an inlet (7) and an outlet (8) so as to cover the inlet (7), and the outlet is provided. A propeller fan (3) is provided facing (8), and outdoor air sucked from the suction port (7) is passed through the heat exchanger (2) by the propeller fan (3), and is passed through the air outlet ( 8) In the outdoor unit of the air conditioner blown out from the air conditioner, the axial dimension (E) of the propeller fan (3) is about the dimension (B) of the main casing (1) along the same direction. The heat exchanger (2) has a shape of a flat plate extending in the radial direction of the propeller fan (3), and is provided in the axial direction with respect to the propeller fan (3). An outdoor unit of an air conditioner, characterized in that: 2. The propeller fan (3) is disposed in a ventilation chamber (5) formed in the main body casing (1) so that its axial direction extends forward and backward.
The outdoor unit of an air conditioner according to claim 1, wherein the radial dimension (F) is about 90% or more of the lateral dimension (C) of the ventilation chamber (5).