JP2715765B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner which comprises an indoor unit and an outdoor unit and performs air conditioning in a room through a refrigerant. The present invention relates to an air conditioner with improved performance.

[0002]

2. Description of the Related Art FIG.
8 is a vertical sectional view of a conventional air conditioner indoor unit disclosed in Japanese Patent Publication No. 8; FIG. 6 is an exploded perspective view showing a centrifugal fan attached to the indoor unit of FIG. 5; It is an enlarged perspective view of the blade which comprises a centrifugal fan.

In the figure, reference numeral 1 denotes an indoor unit of an air conditioner, 2
Is a centrifugal fan made of synthetic resin disposed in the center of the indoor unit 1, 3 is a base of the centrifugal fan 2, 4 is a ring plate constituting a suction portion of the centrifugal fan 2, 4a is a suction port, 5 is a base. 3
A slightly curved substantially plate-shaped blade provided at appropriate intervals in the up-down direction between the base plate 3 and the ring plate 4, and is generally formed integrally with the base 3 and then ultrasonically welded or joined at the joint surface 5 a. It is joined to the ring plate 4 by an adhesive or the like.
The blade 5 serves as an outlet of the centrifugal fan 2 and pressurizes air sucked from the inlet 4a and blows the air to the outer peripheral side which is a right angle direction. 6 is aluminum attached to the center of the base 3 of the centrifugal fan 2,
A fan boss made of brass or the like.

[0004] 7 is an electric motor, 8 is a heat exchanger arranged at a predetermined distance around the outer periphery of the centrifugal fan 2, 9 is an indoor unit 1
Reference numeral 10 denotes an air filter, and 11 denotes an air outlet of the indoor unit 1. 13a, 13b, 13c and 13d indicate the flow of air.

Next, the operation of the conventional air conditioner will be described. When the electric motor 7 is energized, the centrifugal fan 2 rotates, and air is sucked into the indoor unit 1 from the suction port 9 as shown in a flow 13a. The air sucked into the suction port 9 flows into the inside of the centrifugal fan 2 through the air filter 10 through the suction port 4a, and is pressurized to form the blade 5 as shown in a flow 13b.
Along the outer periphery of the centrifugal fan 2 and is sent out at right angles to a heat exchanger 8 disposed at a predetermined distance from the outer periphery of the centrifugal fan 2. Then, the air sent to the heat exchanger 8 exchanges heat with the refrigerant circulating in the pipes of the heat exchanger 8 and then flows as indicated by a flow 13c according to the air path structure of the indoor unit 1, and further flows into a flow 13d. As shown, the air is blown into the room from the air outlet 11 of the indoor unit 1. As a result, indoor air conditioning is performed.

[0006]

By the way, the heat exchanger 8
The height of the blade 5 of the centrifugal fan 2 is considerably longer than the height of the blade 5 of the centrifugal fan 2 in order to ensure the maximum heat exchange area by effectively utilizing the limited space in the indoor unit 1 (in the case of the figure). 2-3 times). On the other hand, the air blown by the blades 5 of the centrifugal fan 2 is blown at right angles to the heat exchanger 8 due to its structure. For this reason, on the heat exchange surface of the heat exchanger 8, the wind speed is increased only at the central portion facing the centrifugal fan 2, the wind speed at the upper and lower ends of the heat exchanger 8 is significantly reduced, and a large variation occurs in the wind speed distribution. I was Accordingly, while the air in the central portion of the heat exchanger 8 flows more than the required amount of air, the air flow in the upper and lower ends of the pipe becomes insufficient. As a result, the heat exchange efficiency of the heat exchanger 8 as a whole is reduced. Was not good and there was room for improvement.

[0007] Accordingly, the present invention provides an air conditioner in which the amount of air blown out from a centrifugal fan and sent out toward a heat exchanger is made uniform over the entire heat exchange surface, thereby improving the heat exchange efficiency of the heat exchanger. The purpose is to provide

[0008]

An air conditioner according to the present invention has a structure in which a centrifugal fan is disposed at the center of an indoor unit and a heat exchanger is disposed around the centrifugal fan. Formed on the surface, the air blowing direction
A rib is formed to correct the width of the air to be expanded .

[0009]

In the present invention, the air blowing direction is corrected by the rib formed on the surface of the blade of the centrifugal fan, and the air blowing width is enlarged. As a result, the wind speed delivered to the heat exchange surface of the heat exchanger becomes uniform throughout.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view showing a centrifugal fan attached to an indoor unit of an air conditioner according to one embodiment of the present invention,
FIG. 2 is an enlarged perspective view of a blade constituting the centrifugal fan of FIG. In the drawings, the same reference numerals as those shown in FIGS. The arrangement of each component of the indoor unit of the air conditioner in this embodiment is shown in FIG.
1 is the same as the indoor unit of the conventional air conditioner shown in FIG.

In the figure, reference numeral 5b denotes a plurality of ribs formed on the surface of each blade 5 of the centrifugal fan 2, and the inclination angle with respect to the horizontal line increases toward the upper and lower ends. The rib 5b can be easily formed by integral molding with the blade 5.

The rib 5b is attached to the blade 5 of the centrifugal fan 2.
The basic operation of the indoor unit 1 formed as described above is the same as that of the conventional example. When the centrifugal fan 2 rotates, the indoor air flows in the order of 13a → 13b → 13c → 13d as shown in FIG. Perform

Next, the operation of the rib 5b formed on the blade 5 will be described. The motor 7 is energized and the centrifugal fan 2
When the air is rotated, the air flowing in from the suction port 4a of the centrifugal fan 2 is pressurized, flows along the blade 5, and is blown out. At this time, since the rib 5b inclined in the vertical direction is formed on the surface of the blade 5, the air is guided to the rib 5b, and spreads in the vertical direction more than the height of the blade 5 to the outside from the centrifugal fan 2. It is blown out.

The wind speed distribution in the heat exchanger 8 due to the formation of the ribs 5b is shown in FIG.
And FIG. FIG. 3 is a characteristic diagram showing a wind speed distribution in a heat exchanger using a centrifugal fan blade according to an embodiment of the present invention. FIG. 4 is a wind speed distribution in a heat exchanger using a conventional centrifugal fan blade. FIG. In the figure, 12a, 12b, 1
Reference numeral 2c denotes a pipe that constitutes a part of the heat exchanger 8 and through which a refrigerant flows.

Normally, since the heat exchanger 8 is vertically longer than the height of the blade 5, in the case of the conventional centrifugal fan 2,
As shown in the air flow 13f in FIG. 4, most of the air flows in the front portion of the heat exchanger 8 facing the blade 5, and the wind speed is large, and the wind speed at the upper and lower ends is small. Significantly different. Therefore, most of the heat exchange occurs with the refrigerant flowing through the pipe 12c located in front of the blade 5, and the pipe 12c located above the blade 5
a and the amount of heat exchange with the refrigerant flowing through the pipe 12b located below is small.

On the other hand, when the blade 5 of the centrifugal fan 2 according to the present embodiment is used, the air flow 1 shown in FIG.
As shown in 3e, since the air blown out of the centrifugal fan 2 spreads vertically by the ribs 5b, it is blown almost uniformly over the entire surface of the heat exchanger 8, and the pipe located above the heat exchanger 8 12a, the pipe 12c located at the center, the pipe 12b located at the lower part, and the like, and substantially the same heat exchange is performed with the refrigerant circulating inside the pipes.

As a result, in a configuration in which the height of the heat exchanger 8 is larger than the height of the blade 5, the amount of heat exchange when the work of the blower, that is, the total amount of air blow, is equal to the present embodiment. In the case where the centrifugal fan 2 is used, the increase is about 5 to 10% as compared with the case where the conventional centrifugal fan 2 is used.

As described above, the air conditioner of the above embodiment is
In the configuration in which the centrifugal fan 2 is disposed in the center of the indoor unit 1 and the heat exchanger 8 is disposed around the centrifugal fan 2,
Rib 5 for guiding blown air in a predetermined direction to the surface of blade 5
b is formed.

Therefore, according to the above embodiment, the air blowing direction is corrected by the rib 5b formed on the surface of the blade 5 of the centrifugal fan 2, and the air blowing width is enlarged. As a result, the wind speed delivered to the heat exchange surface of the heat exchanger 8 is uniform throughout, and the overall amount of heat exchange with the refrigerant circulating in the pipes of the heat exchanger 8 is increased, thereby increasing the heat exchange efficiency. Is improved.

By the way, the number of ribs 5b formed on the blade 5 of the centrifugal fan 2 of the above embodiment is the same as that shown in FIG.
Although the shape, length, and inclination are set, the present invention is not limited to this, and the amount of air blown from the centrifugal fan 2 and sent to the heat exchanger 8 is applied to the entire heat exchange surface. It can be set arbitrarily as long as it can be made extremely uniform. And also in the cross-sectional shape, it can be various shapes, furthermore, the cross-section may be the same over the entire length,
Alternatively, it may be gradually changed or different. However, in these settings, it is important to consider the influence of the rib 5b on the air volume, the noise such as the wind noise, the rotational balance, and the like.

[0021]

As described above, the air conditioner of the present invention
In a configuration in which a centrifugal fan is disposed in the center of the indoor unit and a heat exchanger is provided around the centrifugal fan, ribs for guiding blown air in a predetermined direction are formed on the surfaces of the blades of the centrifugal fan. Therefore, the air blowing direction is corrected by the ribs formed on the surface of the blade, and the air blowing width is enlarged. As a result, the wind speed delivered to the heat exchange surface of the heat exchanger becomes uniform throughout, and the overall amount of heat exchange with the refrigerant circulating in the pipe of the heat exchanger increases,
Heat exchange efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a centrifugal fan attached to an indoor unit of an air conditioner according to one embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a blade constituting the centrifugal fan of FIG.

FIG. 3 is a distribution diagram of wind speed in a heat exchanger when a centrifugal fan according to one embodiment of the present invention is used.

FIG. 4 is a distribution diagram of wind speed in a heat exchanger when a conventional centrifugal fan is used.

FIG. 5 is a longitudinal sectional view of an indoor unit of a conventional air conditioner.

FIG. 6 is an exploded perspective view showing a centrifugal fan attached to the indoor unit of FIG.

FIG. 7 is an enlarged perspective view of a blade constituting the centrifugal fan of FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 indoor unit 2 centrifugal fan 5 blade 5b rib 8 heat exchanger

Claims (1)

(57) [Claims] A centrifugal fan disposed at a central portion of an indoor unit; a heat exchanger disposed around the centrifugal fan; and a blower for air formed on a surface of a blade of the centrifugal fan.
The blowing direction is corrected so that the air blowing width is enlarged.
An air conditioner comprising a correcting rib .