JPH1038305A - Ceiling embedded type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a heating efficiency while preventing a short-circuit by expanding a side wall of a case body in a downwardly slanted manner thus forming a downwardly slanted blow-off opening on its extension and providing a suction propeller fan at an inlet side of a suction opening of the case body. SOLUTION: A side wall 2a of a case body 2 is expanded in a downwardly slanted manner so as to form a downwardly slanted blow-off opening 4 on its extension. A suction propeller fan 20 is disposed at an inlet side of a suction opening 3 of the case body 2. A centrifugal fan 6 has a drive shaft 21 thereof extended downwardly and the suction propeller fan 20 is fixedly mounted on the lower end of the drive shaft 21. Due to such a construction, during a heating operation, upon controlling of a number of revolution of the centrifugal fan 6 and the suction propeller fan 20, hot air blown off from the blow-off opening 4 reaches a floor surface of a room 9. Furthermore, with this air flow, an optimum air conditioning zone can be formed in the room 9 and a short-circuit which leads the hot air blown off from the blow-off opening to the suction opening can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ceiling-mounted air conditioner.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional ceiling-mounted air conditioner. A heat exchanger 7, a drain pan 10, a motor 5, a centrifugal fan 6, a bell mouth 12, and the like are built in a case body 2 embedded in the ceiling 1. A ceiling panel 8 is attached to a lower portion of the case main body 2, a suction port 3 is formed in a center portion thereof, and a plurality of outlets 4 are formed outside the suction port 3 adjacent to the suction port 3.

During operation of the air conditioner, refrigerant from an outdoor unit (not shown) circulates through the heat exchanger 7, and the centrifugal fan 6 is driven by the motor 5. Then, the room air in the room 9 is guided from the suction port 3 through the suction grill 11 and the filter 13, guided by the bell mouth 12, sucked into the centrifugal fan 6, and urged. Then, it is cooled or heated in the process of flowing through the heat exchanger 7 to be conditioned air and blown out of the outlet 4 into the chamber 9.

[0004]

During the heating operation of the conventional air conditioner, since the specific gravity of the warm air blown out from the outlet 4 is smaller than that of the room air, the warm air hardly reaches the floor of the room 9. There is a possibility that a so-called short circuit may be caused in which the hot air is short-circuited from the outlet 4 to the inlet 3 and is sucked.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its gist is to provide a heat exchanger and a centrifugal fan in a case body embedded in a ceiling. In the ceiling-embedded air conditioner having a room air inlet at the center of the ceiling panel covering the lower opening of the case body and a conditioned air outlet at the outside thereof, The recessed ceiling type air conditioner is characterized in that the side wall is enlarged diagonally downward, the outlet is formed diagonally downward in the direction of extension, and a propeller for suction is installed on the inlet side of the inlet. .

Another feature is that a guide cover extending from the outlet to the indoor side is provided.

Still another feature is that the suction propeller fan is attached to a lower end of the centrifugal fan installed in the case body by extending a drive shaft of the fan.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. By expanding the side wall 2a of the case body 2 obliquely downward, the outlet 4 is formed obliquely downward in the extension direction. A suction propeller fan 20 is provided on the inlet side of the suction port 3. The suction propeller fan 20 extends from the drive shaft 21 of the centrifugal fan 6 and is attached to the lower end thereof.

The ceiling panel 8 is provided with a guide cover 22 extending from the outlet 4 to the inside of the chamber 9. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

During operation of the air conditioner, the centrifugal fan 6 and the suction propeller fan
20 are driven simultaneously. Then, the room air in the room 9 is forcibly fed to the suction port 3 by the suction propeller fan 20, passes through the suction grill 11, the filter 13, and passes through the bell mouth 12.
To be sucked into the centrifugal fan 6 and urged.

Then, the air is cooled or heated in the course of flowing through the heat exchanger 7 to become conditioned air, guided to the side wall 2a of the case body 2, and blown obliquely downward from the air outlet 4, and further. The speed is increased in the process of passing through the guide cover 22 and is blown obliquely downward into the chamber 9.

During the heating operation, the hot air blown out from the outlet 4 reaches the floor of the chamber 9 by controlling the rotation speed of the centrifugal fan 6 and the suction propeller fan 20, and the air flow heats the air. An air-conditioning zone optimal for the feeling can be formed in the room 9, and as a result, the heating efficiency can be improved and the running cost can be reduced.

Further, it is possible to prevent a so-called short circuit in which the warm air blown out from the outlet 4 is short-circuited and sucked into the inlet 3.

[0014]

According to the present invention, since the side wall of the case body is enlarged diagonally downward and the outlet is formed diagonally downward in the extension direction, the air flowing out of the heat exchanger is guided by the side wall of the case body. Accordingly, the pressure can be easily inclined downward without increasing the pressure loss, and a so-called short circuit in which the airflow blown out from the outlet is short-circuited to the inlet and sucked can be prevented.

[0015] By installing a suction propeller fan on the inlet side of the suction port and controlling the number of revolutions thereof, it is possible to allow warm air to reach the floor surface during the heating operation, and to control the air conditioner surrounded by the circulating airflow. Since a zone can be formed in a room, heating efficiency can be improved and running costs can be reduced by energy saving.

If a guide cover extending from the outlet to the room side is provided, the blown airflow can be easily directed obliquely downward and the blowout airflow can be increased. Can be easily reached, and the air conditioning zone by the circulating airflow can be easily formed,
In addition, short circuits can be reliably prevented.

If the drive shaft of the centrifugal fan installed in the case main body is extended and attached to the lower end thereof, the suction propeller fan can be easily driven simultaneously with the centrifugal fan and the suction propeller fan can be driven. Can be simplified to contribute to reduction of the cost.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a conventional ceiling-mounted air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceiling 2 Case body 2a Side wall 7 Heat exchanger 6 Centrifugal fan 8 Ceiling panel 3 Inlet 4 Outlet 5 Motor 21 Drive shaft 20 Propeller fan for suction 22 Guide cover

Claims (3)

[Claims] 1. A heat exchanger and a centrifugal fan are installed in a case main body buried in a ceiling, and a central part of a ceiling panel covering a lower opening of the case main body is fitted to a room air inlet and an outside thereof. In the ceiling embedded type air conditioner provided with an air outlet, the side wall of the case main body is diagonally downwardly expanded to form the air outlet diagonally downward in the extension direction thereof and at the inlet side of the suction port. A ceiling-mounted air conditioner characterized by installing a propeller fan for suction. 2. A ceiling-embedded air conditioner according to claim 1, further comprising a guide cover extending from the outlet to the indoor side. 3. The air conditioner according to claim 1, wherein the suction propeller fan is attached to a lower end of a drive shaft of a centrifugal fan installed in the case body by extending the drive shaft. Machine.