JP2001280680A - Suction grille for indoor unit and air conditioner provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress noise made when air passes through a suction grille. SOLUTION: A suction grille formed by mold forming is composed of a plurality of rows of almost rectangular bars 22. When air is sucked from the direction deviated from the mold-open direction, expressions of 0.5<R/D<1.5, and at the same time, R/H<1.0 are satisfied. In the expressions, D expresses a grille thickness of the bar 22, R expresses a radius of the corner, and H expresses a height of the front face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction grill which suppresses noise caused by intake air 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 the like, and among them, the separation type air conditioners have been widely spread.

[0003] Such a separation type air conditioner is composed of an outdoor unit disposed outdoors and an indoor unit disposed indoors, and the indoor unit has a structure as shown in FIG.

That is, the indoor unit 10 draws indoor air from the suction grill 12 through the indoor heat exchanger 11 in which the refrigerant circulated from the outdoor unit (not shown) exchanges heat with the indoor air. It has a blower 13 and the like that blow out into the room again.

[0005] The suction grill 12 is formed integrally with the case 14 by molding with a resin.

[0006]

However, when such an indoor unit 10 is operated, there is a problem that noise is generated when air passes through the suction grill 12.

Accordingly, an object of the present invention is to provide a suction grille which suppresses noise generated when air passes through the suction grille, and an air conditioner using the same.

[0008]

According to a first aspect of the present invention, there is provided an indoor unit provided on a front surface of an indoor unit which draws indoor air, air-conditions the air, and blows the air into the room again. In the suction grill, the indoor unit suction grill is formed by forming a mold in a cage shape including a plurality of grids, and flows in the grid surface when air is sucked in from a direction shifted from a drawing direction of the mold. The grid surface is formed smoothly so that the generated air does not generate a separation vortex, thereby suppressing the generation of noise in the suction grille.

According to a second aspect of the present invention, when the grid is formed in a substantially rectangular shape and the thickness is D, the radius of the corner is R, and the height of the front surface is H, they are 0.5 <R / D. <1.5 and R / H <1.0.

According to a third aspect of the present invention, there is provided an indoor unit having an indoor unit suction grill, and an outdoor unit for supplying a refrigerant to the indoor unit.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are used for the same configurations as those in the related art, and description thereof is omitted as appropriate.

The inventor of the present application has studied the noise generation mechanism when air passes through the suction grill 12, and
A turbulence was generated in the suction grill 12, and it was determined that this was a noise source.

That is, the suction grill 12 in the indoor unit 10
Is molded as shown in FIG. Note that, in FIG. 1, the arrow indicates the direction in which the mold 20 is removed.

[0014] The suction grill 1 thus formed is formed.
Reference numeral 2 denotes a configuration in which a plurality of substantially rectangular lattices 21 as shown in FIG.

However, as shown in FIG. 2, since there is a deviation between the direction in which the mold 20 is pulled out (thick arrow) and the direction in which air flows (dotted arrow), the depressed portion P with respect to the air flow direction.
Was generated, and it was found that the air passing through the depression P swirled and generated noise when the air separated.

As a result of examining this in detail, assuming that the thickness of the grating is D, the radius of the corner of the grating is R, and the height of the front surface of the grating is H, 0.5 <R / D <1.5 ... (Equation 1) When simultaneously satisfying R / H <1.0 (Equation 2), it was ascertained that the vortex does not occur.

Therefore, in the present invention, the suction grille 12 composed of the lattice 22 satisfying the formulas 1 and 2 is formed. As a result, as shown in FIG. 3, the sucked air smoothly flows on the surface of the lattice 22, and the generation of eddies is suppressed, so that noise can be reduced.

An indoor unit 1 having such a suction grill 12
FIGS. 4 and 5 show the calculation results of the noise and the amount of air blown with respect to the rotation speed of the blower 13 when the air conditioner is manufactured using 0.

For reference, the values of the suction grille 12 of the conventional structure which does not satisfy the equations 1 and 2 are also shown, and the dotted line is the value of the configuration of the present invention, and the solid line is the value of the conventional configuration.

From these results, it can be understood that, by forming the suction grille 12 so as to satisfy the expressions 1 and 2, the amount of air to be blown is increased at any rotation speed, and the noise is reduced accordingly. Understand.

The increase in the amount of blown air is due to a decrease in flow resistance due to the suppression of the separation vortex generated when the sucked air passes through the suction grill 12.

Next, an air conditioner having the indoor unit 10 provided with the suction grille 12 will be described. The air conditioner includes an outdoor unit 3 including a compressor 31 for compressing a refrigerant and an outdoor heat exchanger 32 for exchanging heat between the refrigerant and outdoor air.
0, indoor heat exchanger 1 for exchanging heat between refrigerant and indoor air
1. The indoor unit 10 includes a decompression device 33 for decompressing or squeezing the refrigerant, a blower 13 for circulating indoor air through the indoor heat exchanger 11, and the like.

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. This refrigerant is depressurized or throttled by the decompression device 33 and supplied to the indoor heat exchanger 11.

In the indoor heat exchanger 11, room air sucked from the suction grill 12 by the blower 13 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 circulated through the compressor 31, the indoor heat exchanger 11, the pressure reducing device 33, and the outdoor heat exchanger 32 sequentially.

As a result, the refrigerant from the compressor 31 is supplied to the indoor heat exchanger 11 and exchanges heat with the indoor air sucked from the suction grill 12 by the blower 13 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, the noise associated with the intake air is reduced as compared with the air conditioner having the conventional structure, and the air flow rate is improved to improve the comfort.

[0030]

As described above, according to the first aspect of the present invention, the indoor unit suction grille is formed by molding a plurality of lattices in a cage shape, and is shifted from the drawing direction of the mold. When the air is sucked in from different directions, the grid surface is formed smoothly so that the air flowing on the grid surface does not cause separation vortex, so it is possible to suppress the generation of noise at the suction grille Become.

According to the second aspect of the present invention, the lattice is formed in a substantially rectangular shape, the thickness is D, the radius of the corner is R,
When the height of the front surface is H, these are 0.5 <R / D <
Since 1.5 is satisfied and R / H <1.0 is satisfied, when air is taken in from a direction deviated from the drawing direction of the mold, air flowing on the lattice surface causes a separation vortex. As a result, it is possible to smoothly flow through the lattice surface and suppress the generation of noise in the suction grille.

According to the third aspect of the present invention, the air conditioner is constituted by the indoor unit having the indoor unit suction grill and the outdoor unit supplying the refrigerant to the indoor unit, so that the air conditioner can be silently controlled. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a view showing a method of molding a suction grill.

FIG. 2 is a diagram for explaining a mechanism of generating noise generated in a suction grill.

FIG. 3 is a view showing a lattice shape in the suction grille according to the present invention.

FIG. 4 is a diagram showing noise characteristics of a suction grill formed from a grid having the shape shown in FIG. 3;

FIG. 5 is a diagram showing air volume characteristics of an indoor unit having a suction grill formed from a grid having the shape shown in FIG. 3;

FIG. 6 is a configuration diagram of an air conditioner.

FIG. 7 is a configuration diagram of an indoor unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Indoor unit 12 Suction grill 13 Blower 20 Die 22 Lattice

Claims (3)

[Claims] An indoor unit suction grill provided on a front surface of an indoor unit that inhales indoor air, air-conditions the air, and then blows the indoor air again. In addition to being formed by molding, when the air is sucked in from a direction deviated from the drawing direction of the mold, the grid surface is smoothed so that the air flowing on the grid surface does not cause separation vortex. An indoor unit suction grill characterized by being formed. 2. When the grid is formed in a substantially rectangular shape, the thickness is D, the radius of the corner is R, and the height of the front surface is H.
These satisfy 0.5 <R / D <1.5 and R / H
The indoor unit suction grill according to claim 1, wherein the setting is made so as to satisfy <1.0. 3. An indoor unit having an indoor unit suction grill according to claim 1, further comprising an indoor unit having the indoor unit suction grill, and an outdoor unit supplying a refrigerant to the indoor unit. Air conditioner equipped with air conditioner.