JPH08327084A - Ceiling suspended type air conditioner - Google Patents

Abstract

PURPOSE: To enable noise at a location where the clearance between a cross-flow fan and a fan case is narrowed to be reduced by a method wherein a portion where the clearance between the fan case for a cross-flow fan and the cross-flow fan is narrowed most is made of porous sound absorbing material and an air layer is formed at a rear side of the porous sound absorbing material. CONSTITUTION: A fan case 20 for a cross-flow fan 7 is made of porous sound absorbing material, both sides of a recessed part 21 arranged at a rear surface of a part where the clearance between it and cross-flow fan 7 is narrowed most are formed to be contacted with a lower surface of an upper surface panel 3C of a casing 3 and an air layer 22 is formed by a spacing part. When the cross-flow fan 7 is rotated, noise is generated at a location where the clearance between the cross-flow fan 7 and the fan case 20 is narrowed most, although this noise is attenuated while it passes through many small holes of the porous sound absorbing material 20, the noise further enters the air layer 22 to expand and further attenuated. With such an arrangement as above, it is possible to reduce noise generated in a room.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-hung air conditioner.

[0002]

2. Description of the Related Art The present applicant has applied for a patent for a ceiling-suspended air conditioner shown in FIG. As shown in FIG. 2, a suction port 4 is formed in the lower rear portion of a housing 3 suspended from a ceiling 1 via suspension bolts 2, and an air outlet 5 is formed in the front portion. An air passage 6 extending from the suction port 4 to the outlet 5 is formed inside the housing 1, and a heat exchanger 8 and a cross flow rotating around a horizontal axis on the wake side of the heat exchanger 8 are formed in the air passage 6. A fan 7 is provided.

A drain pan 9 which also serves as a lower panel of the housing 3 is arranged under the heat exchanger 8, and a stabilizer 15 for the cross flow fan 7 is formed in front of the drain pan 9 integrally therewith. A fan case 14 for the cross flow fan 7 is attached to the lower surface of the upper panel 3C of the housing 3.

The heat exchanger 8 is bent in a dogleg shape and is installed so as to be inclined so that the suction port 4 side becomes higher. An air filter 13 is obliquely installed between the heat exchanger 8 and the suction port 4 along the heat exchanger 8. In addition, 11 is a louver installed at the air outlet 5, 12
Is the side wall.

During operation of the air conditioner, however, the refrigerant from the outdoor unit (not shown) circulates in the tubes of the heat exchanger 8, and the cross flow fan 7 rotates in the direction of the arrow. Then, the room air enters the air flow path 6 through the suction port 4, and dust contained therein is captured in the process of passing through the air filter 13.

Next, this air is cooled or heated by exchanging heat with the refrigerant flowing in the tube in the process of passing through the gap between the fins of the heat exchanger 8. Then, after being sucked into the cross flow fan 7 and biased, the blowing direction is regulated by the blowing louver 11 and blown out into the room from the blowing outlet 5.

[0007]

In the above air conditioner, when the cross flow fan 7 is rotated during its operation, noise is generated in a portion where the gap between the cross flow fan 7 and the fan case 14 is narrowed, This noise is the suction port 4
Also, there is a problem that the air is emitted from the air outlet 5 into the room.

[0008]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems. The gist of the present invention is to provide a suction port in the lower rear part of a housing suspended on the ceiling. In addition, an air outlet is provided in the front, an air flow path from the suction port to the air outlet is formed in the housing, and the heat exchanger is arranged in the air flow path with the intake port inclined so that the suction port side becomes higher. A cross flow fan that rotates around a horizontal axis is arranged on the downstream side, and the indoor air sucked from the suction port by this cross flow fan is cooled or heated by the heat exchanger, and then the air outlet is discharged. In a ceiling-suspended air conditioner that blows out from a room to a room, at least the portion of the cross case for the cross flow fan where the gap between the fan case and the cross flow fan is narrowest is made of a porous sound absorbing material. The porous the ceiling hanging type air conditioner which is characterized in that the back side of the sound absorbing material to form an air layer.

Another feature is that the air layer is formed between the back surface of the porous sound absorbing material and the top panel of the housing.

Still another feature is that the air layer is constituted by a space formed by providing a recess on the back surface of the porous sound absorbing material and contacting both sides of the recess with the lower surface of the upper panel. There is something I did.

[0011]

In the air conditioner of the present invention, the noise generated at the portion where the gap between the cross flow fan 7 and the fan case is the narrowest during operation of the cross flow fan 7 is reduced by the porous sound absorbing material and the air layer.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. The fan case 20 for the cross flow fan 7 is made of a porous sound absorbing material. Then, a concave portion 21 is provided on the back surface of the portion where the gap with the cross flow fan 7 is the narrowest, and both sides of the concave portion 21 are brought into contact with the lower surface of the upper panel 3C of the housing 3 to form an air layer. 22 are formed. Other configurations are similar to those shown in FIG.
Corresponding members are given the same reference numerals.

When the cross-flow fan 7 is rotated, noise is generated in the narrowest gap between the cross-flow fan 7 and the fan case 20, and this noise is generated in the process of passing through many small holes of the porous sound absorbing material 20. It is attenuated and further attenuated by entering the air layer 22 and expanding.

In the illustrated embodiment, the fan case 20
Although the whole is made of a porous sound absorbing material, only the portion where the gap with the cross flow fan 7 is the narrowest can be made of a porous sound absorbing material. Further, if the drain pan 9 is made of a sound absorbing material, noise can be further reduced.

[0015]

According to the present invention, the noise generated at the portion where the gap between the cross flow fan 7 and the fan case is the narrowest during operation of the cross flow fan 7 is attenuated by the porous sound absorbing material and the air layer. It is possible to reduce the noise radiated to the.

If a concave portion is provided on the back surface of the porous sound absorbing material and the air layer is constituted by a space portion formed by contacting both sides of the concave portion with the lower surface of the upper panel of the housing, the air layer can be easily formed. And it can be formed at low cost.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional view of a conventional air conditioner.

[Explanation of symbols]

 1 Ceiling 2 Suspended Bolt 3 Housing 3C Top Panel 4 Suction Port 5 Air Outlet 6 Air Flow Path 7 Cross Flow Fan 8 Heat Exchanger 9 Drain Pan 20 Fan Case 21 Recess 22 Air Layer

Claims (3)

[Claims] 1. An air flow path extending from the suction port to the air outlet is formed in the housing by providing a suction port at a lower rear portion of the housing suspended on the ceiling and a front air outlet at the front portion of the air. A heat exchanger is installed in the flow path so as to be inclined so that the suction port side is higher, and a cross flow fan that rotates around a horizontal axis is arranged on the downstream side of the heat exchanger. In the ceiling-suspended air conditioner, which cools or heats the indoor air sucked from the room by the heat exchanger, and then blows it out into the room from the air outlet, between at least the crossflow fan in the fan case for the crossflow fan. A ceiling-suspended air conditioner characterized in that the portion where the gap between the two is the narrowest is composed of a porous sound absorbing material, and an air layer is formed on the back side of this porous sound absorbing material. 2. The ceiling-hung air conditioner according to claim 1, wherein the air layer is formed between the back surface of the porous sound absorbing material and the top panel of the housing. 3. A recess is provided on the back surface of the porous sound absorbing material,
The ceiling-hung air conditioner according to claim 2, wherein the air layer is formed by a space formed by contacting both sides of the recess with the lower surface of the upper panel.