JPH1183060A - Flush-with-ceiling type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce pressure loss of an air flow from a centrifugal fan to an air outlet by obliquely downward enlarging a sidewall of a case body, obliquely upward enlarging a heat exchanger, and providing the outlet over a whole peripheral edge of a ceiling panel. SOLUTION: A case body 20 has a regular octagonal one top surface 21, and eight truncated sidewalls 22a to 22h coupled at vertexes to respective sides of the plate 21 to exhibit an obliquely downward enlarging regular octagonal conical shape with an obtuse angle to the plate 21. A heat exchanger 70 has eight inverted trapezoidal shape plate-like heat exchangers 7a to 7h to exhibit an obliquely upward enlarging regular octagonal conical, shape. A ceiling panel 80 has air outlets 4a to 4h parallel to the respective sides at centers of obliquely upward eight peripheral edges. Thus, the air diffused horizontally from a centrifugal fan 6 is guided to the sidewalls 22a to 22h and turned obliquely downward, and hence pressure loss based on a bent of an air flow is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art An example of a conventional ceiling-mounted air conditioner is shown in FIG. is there. 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 box-shaped case main body 2 embedded in the ceiling 1.
A substantially square ceiling panel 8 covering the lower opening is attached to the lower portion of the case body 2, and a suction port 3 is formed at the center thereof, and the outside thereof is located at the center of each side. An outlet 4 is formed.

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, cooling or heating is carried out by horizontally blowing the heat exchanger 7 which is blown horizontally in the radial direction from the centrifugal fan 6 over an angle range of 360 °, and then flows through a heat exchanger 7 which is bent in a substantially rectangular shape. After that, the air becomes conditioned air, and after that, it is turned downward at a substantially right angle on the substantially vertical four side walls 2b of the case body 2, and then
It is contracted and blown out of the four outlets 4 into the chamber 9.

[0005]

In the above-mentioned conventional air conditioner, the air blown out from the centrifugal fan 6 and directed in the radial direction over an angle range of 360.degree. When passing obliquely through the corner, it receives a large resistance.

When the conditioned air flowing through the heat exchanger 7 is turned downward by a side wall 2b of the case body 2 at a substantially right angle, a pressure loss occurs due to the bending. Then, the air flow turned downward is the four outlets 4.
The pressure loss is caused by the contraction.

In the heating operation, there is a possibility that the so-called short circuit in which the warm air blown out from the outlet 4 is short-circuited and sucked from the inlet 3 is generated. Further, since the distance between the centrifugal fan 6 and the heat exchanger 7 is small, 1250 to 2500
Hz interference noise is generated.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to provide a centrifugal fan in the center of a case body embedded in a ceiling. A heat exchanger is installed around it, and a ceiling panel that covers the lower opening of the case main body is provided with a room air inlet at the center and a conditioned air outlet outside the center. In the machine, the side wall of the case body is expanded diagonally downward, and the heat exchanger is expanded diagonally upward, and the outlet is provided over the entire periphery of the ceiling panel. Located in ceiling-mounted air conditioners.

Another feature is that the side wall of the case body and the heat exchanger are regular polygonal pyramids, and the plan shape of the ceiling panel is regular polygonal.

Another feature is that the side wall of the case body and the heat exchanger are conical and the plan shape of the ceiling panel is circular.

Another feature is that the top plate and the side wall of the case main body are formed by smooth curved surfaces that are continuous with each other.

Still another feature is that the top plate and the side wall of the case main body are connected via a smooth curve.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. 1, wherein (A) is a longitudinal sectional view, (B) is a plan view, and (C) is a perspective view of a heat exchanger.

The case body 20 has a trapezoidal eight side walls 22a, each of which is connected to a single top plate 21 having a regular octagon and a top side connected to each side thereof.
22b, 22c, 22d, 22e, 22f, 22g, 22h,
Each side of each side wall 22a to 22h is connected to the side of the adjacent side wall. Thus, each of the side walls 22a to 22h has a regular octagonal pyramid that expands obliquely downward, and forms an obtuse angle with the top plate 21.

As shown in FIG. 1C, the heat exchanger 70
Inverted trapezoidal plate heat exchangers 7a, 7b, 7c, 7d, 7e, 7
f, 7g, 7h, these inverted trapezoidal plate heat exchangers 7
By connecting both sides of a to 7h to the sides of the adjacent heat exchanger, the heat exchanger 70 exhibits a regular octagonal pyramid that expands diagonally upward.

The ceiling panel 80 has a dish-shaped vertical section and a regular octagon in plan view, and the outlets 4a, 4b, 4c are provided at the centers of eight peripheral edges inclined obliquely upward so as to be parallel to the respective sides. ,
4d, 4e, 4f, 4g, and 4h are formed. FIG. 2 shows another configuration.
The same reference numerals are given to corresponding members, and description thereof will be omitted.

The centrifugal fan 6 is driven by the motor 5.
Is driven, 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, the air is blown horizontally from the centrifugal fan 6 in the radial direction over an angle range of 360 °. Next, it is turned or turned down in the process of turning obliquely downward and flowing through the heat exchanger 70, and becomes conditioned air by being cooled or heated.
It is guided to 22a to 22h and is blown obliquely downward into the chamber 9 from the outlets 4a to 4h.

Thus, the air blown horizontally from the centrifugal fan 6 spreads the side wall of the case body 20 which expands obliquely downward.
Since it is turned obliquely downward by being guided to 22a to 22h, the pressure loss due to the bending of the air flow is reduced.

Further, since the obliquely downward airflow flows through the heat exchanger 70 which expands obliquely upward, the pressure loss of the airflow when flowing through the heat exchanger 70 is reduced.

Air blown radially from the centrifugal fan over an angle range of 360 ° flows through each of the plate-shaped heat exchangers 7a to 7h forming a regular octagonal pyramid so as to be substantially orthogonal thereto. In addition, since the pressure loss is reduced and the blind spot is eliminated as in the related art, the capability of the heat exchanger 70 can be sufficiently exhibited.

Further, the airflow of the conditioned air flowing through each of the plate heat exchangers 7a to 7h is blown out from each of the outlets 4a to 4h with almost no contraction, so that the pressure loss due to the contraction of the airflow is reduced. Can be reduced.

Further, since the conditioned air is blown into the chamber 9 so as to expand obliquely downward from the outlets 4a to 4h, a short circuit can be prevented.

Further, since the heat exchanger 70 expands obliquely upward, the portion where the highest speed airflow blows out from the centrifugal fan 6, that is, the distance between the upper end of the air outlet and the heat exchanger 70 increases. Therefore, interference noise can be reduced.

In the above embodiment, the side walls 22a to 22h and the heat exchanger 70 of the case body 20 are regular octagons, but they may be regular polygons or cones.

Although the plane shape of the ceiling panel 80 is a regular octagon, it may be a regular polygon or a circle.

Further, the number of the outlets 4a to 4h is not limited to eight, and a large number can be provided at small intervals along the circumferential direction so as to cover the entire circumference of the ceiling panel 80. They may be shaped or they may be connected to each other to form an annular shape.

Further, the top plate 21 and the side walls 22a of the case body 20 are formed.
Although 22h has an obtuse angle, they may be formed by continuous smooth curved surfaces or connected through smooth curved surfaces.

[0029]

In the present invention, the side wall of the case body is expanded obliquely downward, the heat exchanger is expanded obliquely upward, and the outlet is provided over the entire periphery of the ceiling panel. Since the pressure loss of the airflow from the fan to the outlet can be reduced, a high-speed airflow can be blown into the room from the outlet, so that the rotation speed of the centrifugal fan can be suppressed to a minimum, so that the blowing noise can be reduced. During the heating operation, the warm air can reach far away.

Further, the conditioned air can be blown into the room at a high speed so as to expand obliquely downward from the outlet.
The occurrence of a short circuit during the heating operation can be prevented.

Further, since the heat exchanger is expanded obliquely upward, the height of the case and the height of the case body can be reduced, and the portion of the centrifugal fan from which the fastest airflow is blown out and the heat exchanger. The interference noise can be reduced.

If the top plate and the side wall of the case main body are formed of continuous smooth curved surfaces or connected via smooth curved surfaces, the pressure loss of the air flow from the centrifugal fan to the outlet can be further reduced.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, wherein (A) is a longitudinal sectional view,
(B) is a plan view, and (C) is a perspective view of a heat exchanger.

2A and 2B show a conventional ceiling-mounted air conditioner, in which FIG. 2A is a longitudinal sectional view, and FIG. 2B is a transverse sectional view taken along the line BB of FIG. 2A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceiling 20 Case body 21 Top plate 22a-22h Side wall 6 Centrifugal fan 70 Heat exchanger 80 Ceiling panel 3 Inlet 4a-4h Outlet

Claims (5)

[Claims] 1. A centrifugal fan is installed in the center of a case main body buried in a ceiling, and a heat exchanger is installed around the center of the centrifugal fan. Room air is provided at the center of a ceiling panel covering a lower opening of the case main body. In a ceiling-embedded air conditioner having a suction port and a conditioned air outlet on the outside thereof, the side wall of the case body is expanded diagonally downward and the heat exchanger is diagonally expanded upward, and An air conditioner with an embedded ceiling, wherein the outlet is provided over the entire periphery of the ceiling panel. 2. A ceiling-embedded air conditioner according to claim 1, wherein the side wall of the case body and the heat exchanger are regular polygonal pyramids, and the planar shape of the ceiling panel is regular polygonal. Machine. 3. The ceiling-mounted air conditioner according to claim 1, wherein the side wall of the case body and the heat exchanger are conical, and the planar shape of the ceiling panel is circular. 4. The ceiling-embedded air conditioner according to claim 1, wherein the top plate and the side wall of the case body are formed by smooth curved surfaces that are continuous with each other. 5. The ceiling-embedded air conditioner according to claim 1, wherein the top plate and the side wall of the case main body are connected via a smooth curve.