JPH06257795A - Front grill for air conditioner outdoor device - Google Patents

Abstract

PURPOSE:To reduce interference sound and peeling sound and to decrease noise of an entire outdoor unit by arranging a filament machine of a guard net radially in a logarithmic spiral. CONSTITUTION:A front surface grill 10 is mounted at a wake flow side of a diffuser of a blower for externally diffusing the air from an impeller through the diffuser. A guard net of the grill 10 is arranged at a filament machine 11 in a logarithmic spiral. Thus, a resistance of a flow of the air to be discharged from the impeller can be reduced, peeling from a front surface grill guard is decreased to reduce noise. An enlarging angle of the logarithmic spiral is set to 30-40 degrees to most effectively reduce a resistance of the net to the flow of the air to be discharged from the impeller.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an outdoor unit for an air conditioner,
The present invention relates to a front grill used for a guard that must cover a blower for security reasons.

[0002]

2. Description of the Related Art An outdoor unit of an air conditioner having a conventional front grill will be described with reference to FIG. As shown, the impeller 3 and the motor 4 are placed in the space surrounded by the heat exchanger 1 and the exterior plate 2.
Is stored, and an orifice 5 is provided around the impeller 3. The exterior plate 2 facing the downstream side of the impeller 3 is provided with a blowout port 6, and a front grill 7 is attached to the outside thereof. The motor 4 is fixed to the exterior plate 2 by a support.

The linear bars of the front grille 7 are made of the same material as the exterior plate 2, have a circular cross section, and are arranged in a grid pattern on a plane parallel to the front face of the exterior plate 2 with a slight distance therebetween. Has been done.

In this structure, the rotation of the impeller 3 sucks air from the heat exchanger 1, and the air is blown out from the front grill 7 through the air outlet 6.

[0005]

However, in the shape of the front grill 7 as described above, interference noise and peeling noise are high due to the resistance between the grid-shaped linear bars and the flow of air blown out from the impeller 3. Therefore, the noise level of the outdoor unit as a whole was increased.

The present invention solves the above-mentioned conventional problems, and an object thereof is to reduce the above-mentioned interference noise and peeling noise and to reduce the noise of the entire outdoor unit.

[0007]

In order to solve the above problems, the present invention provides an air conditioner in which a front grill is installed on the downstream side of an outlet of a blower for blowing air from an impeller to an outside through an outlet. The front grill has a structure in which the wire bars of the guard net are arranged in a radial logarithmic spiral shape.

Further, the expansion angle of the logarithmic spiral of the linear bar of the guard network is set to 30 to 40 degrees. Further, the cross section of the linear crosspiece arranged in the logarithmic spiral is formed into an elliptical shape.

[0009]

The present invention is an air conditioner in which a front grill is installed on the downstream side of a blower outlet of an air blower that blows air to the outside from an impeller. In addition, by arranging in a logarithmic spiral, the flow of air discharged from the impeller and the resistance of the guard net are reduced, the separation from the guard net is reduced, and the noise is reduced.

The expansion angle of the logarithmic spiral is 30 degrees to 4 degrees.
By setting it to 0 degree, the resistance to the flow of air discharged from the impeller is most effectively reduced, and the noise due to separation from the guard net is reduced.

Further, by making the cross section of the linear crosspiece oval, the separation width of the air flow from the guard net itself is made proper,
It is intended to reduce the peeling noise from the guard net.

[0012]

FIG. 1 shows a front grille according to a first embodiment of the present invention, which is not shown, but the front grille 10 is provided on the downstream side of the blower outlet of a blower for blowing air from an impeller through a blower outlet to the outside. Is installed. The card net of the front grille 10 is constructed by arranging the linear bars 11 in a logarithmic spiral shape.

FIG. 3 shows data obtained by irradiating a laser beam from the front of the outdoor unit with the front grill removed, and measuring the velocity vector and the degree of turbulence with a laser Doppler velocimeter. As shown in FIG. 3, the direction of the velocity vector is substantially logarithmic. From this, the front grille 10 of the present embodiment reduces the resistance to the flow of the air discharged from the impeller by forming the wire bar 11 of the guard net in the logarithmic spiral shape as described above, and The noise is reduced by reducing the peeling from the grill guard net.

In the second embodiment of the present invention, the expansion angle of the logarithmic spiral is set to 30 to 40 degrees. With this configuration, the flow of air discharged from the impeller and the resistance of the guard net are most effectively reduced, and the noise caused by separation from the grill is reduced. Specifically, it was confirmed by experiments that the noise level deteriorates when the enlargement angle is set to a value other than the above value. In addition, the data of FIG. 3 also shows that the expansion angle of the velocity vector is in the range of 30 to 40 degrees, and that the resistance to the air can be most effectively reduced by selecting this value.

FIG. 2 shows a third embodiment of the present invention. In this embodiment, the cross section of the linear crosspiece 11 arranged in the logarithmic spiral is elliptical. With this configuration, the separation width of the airflow from the linear crosspiece itself is made proper, and the separation noise from the front grill is reduced.

[0016]

As is clear from the description of the above embodiment,
The present invention relates to an air conditioner in which a front grill is installed on the downstream side of a blower outlet of an air blower that blows out air from an impeller to the outside, and a guard net of the front grille is provided with radial lines and logarithmic spirals. Since they are arranged in a shape, it is possible to reduce the resistance between the flow of air discharged from the impeller and the guard net, reduce separation from the guard net, and reduce noise.

The expansion angle of the logarithmic spiral is 30 degrees to 4 degrees.
By setting the angle to 0 degrees, the resistance between the flow of air discharged from the impeller and the guard net can be most effectively reduced, and the noise due to separation from the guard net can be reduced. Further, by making the cross section of the linear crosspiece arranged in the logarithmic spiral shape elliptical, the separation width of the airflow from the linear crosspiece itself can be made appropriate, and the separation noise from the linear crosspiece can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a front grille according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a line bar in a front grille according to another embodiment of the present invention.

FIG. 3 is a diagram showing a velocity vector and turbulence of blown air with a front grill removed.

FIG. 4A is a schematic sectional view of an outdoor unit, and FIG. 4B is a partial sectional view of a guard net.

[Explanation of symbols]

 10 Front grille 11 Front grille guard wire bar

Claims (3)

[Claims] 1. An air conditioner in which a front grill is installed on the downstream side of an outlet of an air blower that blows air from an impeller to the outside through an outlet, and the wire rods of a guard net are radial and logarithmic spirals. Front grille for outdoor unit of air conditioner. 2. A front grill for an outdoor unit of an air conditioner according to claim 1, wherein the expansion angle of the logarithmic spiral is 30 to 40 degrees. 3. The front grill for an outdoor unit of an air conditioner according to claim 1, wherein the cross section of the linear crosspiece arranged in a logarithmic spiral shape is elliptical.