JP2001280647A - Blower, and air conditioner using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise due to the fluctuation of pressure that is generated between a cross flow fan and a stabilizer 22. SOLUTION: A blower is composed of a cross flow fan where a plurality of blades 23 that are extended in the direction of a rotary shaft are arranged in the peripheral direction of rotation, and a stabilizer 22 for straightening the flow of the swirl of air being generated in the cross flow fan and allowing the air to cross the cross flow fan smoothly for flowing. At this time, the stabilizer 22 forms an uneven part 25 on an opposing surface 24 that opposes the cross flow fan, thus shifting the phase between pressure fluctuation that is generated at a point A and pressure fluctuation that is generated at a point B, off setting them, and hence suppressing the generation of a large noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower in which noise due to pressure fluctuations generated between a cross flow fan and a stabilizer is reduced, and an air conditioner using the same.

[0002]

2. Description of the Related Art At present, air conditioners are widely used in ordinary households, and among them, separation type air conditioners are widely used.

[0003] Such a separation type air conditioner is composed of an outdoor unit disposed outdoors and an indoor unit disposed indoors.

As shown in FIG. 8, the indoor unit 10 includes an indoor heat exchanger 11 for exchanging heat between refrigerant and indoor air, and a blower 20 for circulating indoor air through the indoor heat exchanger 11. ing.

[0005] The blower 20 is formed by a motor (not shown) and a cross flow fan 21 rotated by the motor.

When the cross flow fan 21 is simply rotated, air is blown in all directions, so that the indoor heat exchanger 1
1 cannot be circulated through the room air.

[0007] Then, as air flows in one direction,
Stabilizer 2 facing cross flow fan 21
2 are provided.

[0008]

However, the rotation of the cross flow fan 21 causes a pressure fluctuation between the cross flow fan 21 and the stabilizer 22 to generate noise.

Accordingly, an object of the present invention is to provide a fan with reduced noise and an air conditioner using the same.

[0010]

According to a first aspect of the present invention, there is provided a cross-flow fan comprising a plurality of blades extending in a rotation axis direction and arranged in a rotational circumferential direction. A blower that rectifies the vortex of air generated in the blower and causes the air to flow smoothly across the cross flow fan, wherein the stabilizer has an opposing surface facing the cross flow fan, and In addition, irregularities are formed on the facing surface to suppress generation of large noise due to pressure fluctuation generated between the cross flow fan and the stabilizer.

According to a second aspect of the present invention, when the unevenness formed at the position of the opposing surface facing one blade is a concave portion, the unevenness formed at the position of the opposing surface where the adjacent blade opposes. Are characterized by forming convex portions.

The invention according to claim 3 is characterized in that the room is air-conditioned by inhaling room air with a blower and exchanging heat with refrigerant in a room heat exchanger.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. The same components as those of the related art are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The inventor of the present application has studied the mechanism of generating noise between the cross flow fan 21 and the stabilizer 22, and has found the following.

That is, as shown in FIG. 8, the cross flow fan 21 has a structure in which a plurality of blades 23 extending in the direction of a rotating shaft (not shown) are provided in a plurality of rows in the circumferential direction. .

In FIG. 8, the direction of the rotation axis is a direction perpendicular to the plane of the paper, and the cross flow fan 21 rotates in the ω direction so that the indoor air is sucked from the intake grill 15 and the indoor heat exchanger 11 is The air is discharged again from the discharge port 16 into the room. Arrows in the figure indicate the flow of air.

Therefore, the inventor of the present application paid attention to the pressure fluctuation on the opposing surface of the stabilizer 22 on which the blade 23 opposes.

FIG. 1 is a view showing the relationship between the cross flow fan 21 and the stabilizer 22 at a certain point in time. The blades 23a and 23b face points A and B on the facing surface 24 of the stabilizer 22. .

The dotted line in FIG.
1 is a line connecting the rotation center of 1 and the blade 23, and the angle of the line is θ = 360 degrees / N, where N is the total number of the blades 23.
Given by

FIG. 2 is a diagram showing the pressure fluctuation at the points A and B. As can be seen from these figures, the phases of the pressure fluctuations at the points A and B are substantially the same.

For this reason, it is considered that the sounds generated at the respective points overlap each other and are observed as a loud noise. In the present invention, the phases of the pressure fluctuations at the respective points are made not to coincide.

Specifically, focusing on the fact that the phase of the pressure fluctuation at each point is determined by the distance between the tip of the blade 23 and the corresponding opposing surface 24 of the stabilizer 22, as shown in FIG. The unevenness 25 was provided on the surface 24.

In FIG. 3, point A becomes a valley (concave) and B
The point is set to be a mountain (convex), and the distance to the tip of the blade 23 is changed.

As a result, the phases of the pressure fluctuations at the points A and B are shifted and observed as waveforms as shown in FIG.

As is apparent from FIG. 4, since the phases at the points A and B are shifted from each other by approximately 180 degrees, when the sounds generated at the respective points are superimposed, components that cancel each other out are generated and large. No longer observed as noise. That is, noise can be reduced.

Of course, the present invention is not limited to the case where one unevenness 25 is provided for one pitch as shown in FIG. 3, but one end of the pitch (point A) as shown in FIG. A plurality of irregularities 25 may be provided as long as the concave portion is located at a position corresponding to point B and the other is a convex portion.

FIG. 6 shows a result of a noise test of the indoor unit 10 constructed by using the stabilizer 22 provided with the irregularities 25 as described above.

It should be noted that, in the figure, the conventional configuration shown by FIG. 1 (◇), the present invention shown by FIG. 2 (△), and FIG.
5 shows the noise with respect to the air flow of another configuration of the present invention shown in FIG.

As described above, it has been shown that the structure according to the present invention can reduce the noise with respect to any air flow compared to the conventional structure, and is particularly generally used in the indoor unit 10. When the air volume is large (design air volume), the configuration shown in FIG. 2 is 0.5 dB-A, and the configuration shown in FIG.
It was shown that the noise of A could be reduced.

An air conditioner having such a configuration as shown in FIG. 7 was constructed by using the indoor unit 10 as described above, and an on-site noise reduction test was performed. Good results were obtained.

Incidentally, the blades 23 provided on the cross flow fan 21 may be formed as several blocks in the axial direction.

For example, assuming that the length of the cross flow fan 21 is L, the length of the blade 23 may be L / 3 and may be three blocks.

In such a case, since the blade 23 is mounted so that the position of the blade 23 is slightly shifted in each block, the uneven position 25 formed on the opposing surface 24 of the stabilizer 22 is set in accordance with the position. Is preferred.

The air conditioner shown in FIG. 7 has a compressor 31 for compressing a refrigerant, an outdoor unit 30 having an outdoor heat exchanger 32 for exchanging heat between the refrigerant and the outdoor air, and heats the refrigerant and the indoor air. The indoor unit 10 includes an indoor heat exchanger 11 to be exchanged, a decompression device 33 that decompresses or throttles the refrigerant, and the above-described blower 20 that circulates indoor air through the indoor heat exchanger 11.

When the cooling operation is performed, the refrigerant is circulated through the compressor 31, the outdoor heat exchanger 32, the pressure reducing device 33, and the indoor heat exchanger 11 sequentially.

Thus, the refrigerant from the compressor 31 exchanges heat with the outside air in the outdoor heat exchanger 32 and condenses. The refrigerant is decompressed or throttled by the pressure reducing device 33 and supplied to the indoor heat exchanger 11.

In the indoor heat exchanger 11, room air sucked from the intake grill 15 by the blower 20 is circulated, and heat exchange between the room air and the refrigerant causes the refrigerant to evaporate to the compressor 31. Returning, the indoor air loses heat of evaporation and the room is cooled.

On the other hand, when performing the heating operation, the refrigerant is sequentially circulated through the compressor 31, the indoor heat exchanger 11, the pressure reducing device 33, and the outdoor heat exchanger 32.

As a result, the refrigerant from the compressor 31 is supplied to the indoor heat exchanger 11 and exchanges heat with the indoor air taken in from the intake grill 15 by the blower 20 to condense. As a result, the room air is heated by receiving the condensation heat.

The condensed refrigerant is decompressed or throttled by the decompression device 33 and supplied to the outdoor heat exchanger 32, where the refrigerant exchanges heat with the outside air to evaporate and evaporate.
Return to 1.

In such an air conditioner, noise generated by the stabilizer 22 was reduced as compared with an air conditioner having a conventional structure, and improvement in comfort was confirmed.

It is to be noted that the cross-sectional shape of the unevenness 25 is not limited to the triangular shape as shown in each of the drawings, but may be a shape that fluctuates in a sine function.

[0043]

As described above, according to the first aspect of the present invention, the stabilizer has the opposing surface facing the cross flow fan, and the uneven surface is formed on the opposing surface, so that the cross flow fan and the stabilizer are formed. It is possible to suppress noise caused by pressure fluctuation occurring between the above and noise reduction.

According to the second aspect of the present invention, when the unevenness formed at the position of the opposing surface on which one of the blades faces is a recess, the adjacent blade is formed at the position of the opposing surface. As the irregularities that make up the convex part,
With a simple configuration, it is possible to suppress noise caused by pressure fluctuations generated between the cross flow fan and the stabilizer, thereby achieving a silent operation.

According to the third aspect of the present invention, the indoor air is suctioned by the blower, and the indoor heat exchanger exchanges heat with the refrigerant so that the room is air-conditioned. Therefore, the noise of the air conditioner is reduced. It is now possible to improve comfort.

[Brief description of the drawings]

FIG. 1 is a diagram applied to a description of a mechanism of generating noise generated between a stabilizer and a cross flow fan.

FIG. 2 is a diagram showing pressure fluctuations at points A and B in FIG.

FIG. 3 is a diagram showing a configuration of a stabilizer according to the present invention.

4 is a diagram showing pressure fluctuations at points A and B in FIG.

FIG. 5 is a diagram showing another configuration of the stabilizer according to the present invention.

FIG. 6 is a diagram showing the results of a verification test of the present invention.

FIG. 7 is a configuration diagram of an air conditioner.

FIG. 8 is a configuration diagram of an indoor unit.

[Explanation of symbols]

 Reference Signs List 10 indoor unit 11 indoor heat exchanger 20 blower 21 cross flow fan 22 stabilizer 23 blade 24 facing surface 25 unevenness

Claims (3)

[Claims] 1. A cross flow fan having a plurality of blades extending in a rotation axis direction arranged in a rotation circumferential direction, and a vortex of air generated in the cross flow fan is rectified so that the air smoothly flows through the cross flow fan. A blower having a stabilizer that flows across the flow fan, wherein the stabilizer has an opposing surface facing the cross flow fan, and has irregularities formed on the opposing surface. Blower. 2. When the unevenness formed at the position of the facing surface facing one of the blades is a recess, the unevenness formed at the position of the facing surface facing the adjacent blade. The blower according to claim 1, wherein the blower is formed to be a convex portion. 3. The air blower according to claim 1, wherein indoor air is sucked by the blower, and heat is exchanged with refrigerant by an indoor heat exchanger to make the room air-conditioned. Air conditioner.