JPH0633886B2 - Ceiling-mounted air conditioner - Google Patents

Description

Description: <Industrial field of application> The present invention relates to a ceiling-mounted air conditioner suitable for air-conditioning a room with a high ceiling.

<Prior Art> Conventionally, there is a ceiling-mounted air conditioner as shown in FIG. 4 (Japanese Utility Model Laid-Open No. 60-155824).
This ceiling-mounted air conditioner is installed in a space 1 behind the ceiling, and by connecting a room-side unit 3 having a room-side heat exchanger 2 and a blow-out unit 6 having a centrifugal fan 5 with a duct 7, Indoor unit 3 with 4 air
As shown by the arrow, heat is exchanged by exchanging the heat, and the heat-exchanged air is blown out from the blowout unit 6 by the centrifugal fan 5 to air-condition the room 4.

Further, there is a conventional ceiling-mounted air conditioner shown in FIG. In this ceiling-mounted air conditioner, an indoor unit 15 having an indoor heat exchanger 13 connected to an outdoor unit (not shown) and a centrifugal fan 12 is installed in the ceiling space 1, and a centrifugal fan 16 is installed. Is installed in the indoor unit 15
And the blowout unit 17 are connected by a duct 18.
Then, after the air is sucked into the indoor unit 15 from the room 4 and heat is exchanged in the indoor unit 15, the air is blown from the blowing unit 17 toward the room 4.

<Problems to be Solved by the Invention> However, in the above-described conventional ceiling-mounted air conditioner, as shown in FIG. 5, conditioned air is blown from the centrifugal fan 16 of the blowing unit 17 into the room 4. Therefore, there is a problem that the conditioned air cannot be sent to the vicinity of the floor surface 9 in the room 4 having a high ceiling, and the air conditioning in the lower region cannot be performed. In particular, during heating, when the amount of conditioned air blown out from the blowout unit 17 is small,
The air blown out from the blowout unit 17 floats up as shown in the area F in FIG. 5 and does not go to the space near the floor 9 and is sucked into the indoor unit 15.

Thus, in the conventional ceiling-mounted air conditioner,
There is a problem that it is not possible to suppress the floating of the conditioned air due to the buoyancy of the conditioned air during heating, and it is not possible to completely perform air conditioning near the floor surface 9.

Therefore, an object of the present invention is to completely air-condition an area near the floor surface even in a high-ceiling room by ejecting conditioned air from the indoor unit so that the air current can be prevented from rising even during heating. It is to provide a ceiling-mounted air conditioner that can be used.

<Means for Solving Problems> In order to solve the above problems, the ceiling-mounted air conditioner of the present invention has a compressor, an outdoor heat exchanger, a four-way switching valve, and An indoor unit 15 that is connected to an outdoor unit having expansion means, is installed in the ceiling space 1, has an indoor heat exchanger 13, and is installed in the ceiling space 1; Centripetal fan 5 that draws in air from the air and blows it out axially forward
The blowout unit 31 having 0 is connected by a duct 34.

<Operation> The conditioned air that has been sucked into the indoor unit 15 and has undergone heat exchange in the indoor heat exchanger 13 is sent to the blowout unit 31 through the duct 34. Then, it is sent to the room 4 by the centripetal fan 50 of the blowing unit 31. Since the centripetal fan 50 sucks in conditioned air from the circumferential direction or from an oblique direction with respect to the axis and blows the conditioned air forward in the axial direction, the centripetal force of the blown airflow is the centrifugal force of the swirling speed in the region H near the ceiling plate 8. Stronger, the air flow becomes slightly contracted as shown by the solid line in FIG. 1, jets downward, reaches below the conventional one shown by the broken line in FIG. In the lower region L near the floor surface 9, the air current is rapidly decelerated due to the centrifugal force and the diffusiveness of the air current due to the swirling of the air current, and the velocity is such that the draft is not felt, and the velocity is about 2 m from the floor surface.
Appropriate thermal sensation is obtained in a wide range of areas A and B.

In this way, the centripetal fan 50 blows out the blowing unit 3
Since the conditioned air is spouted from 1 in a contracted manner, the airflow reaches the floor 9 even in the high-ceiling room 4, and the air conditioning near the floor is completely performed.

<Example> Hereinafter, the present invention will be described in detail with reference to illustrated examples.

In FIG. 1, reference numeral 15 denotes an indoor unit that is installed in the space 1 behind the ceiling plate 8 and has a centrifugal fan 12 and an indoor heat exchanger 13. Although not shown, the indoor heat exchanger 13 is connected to an outdoor unit having a compressor, an outdoor heat exchanger, a four-way switching valve, and expansion means.

Further, 31 and 31 are blow-out units arranged in the space 1 above the ceiling and having centripetal fans 50 and 50. The indoor unit 15 and the blowout units 31, 31 are connected by ducts 34, 34.

As shown in FIG. 2, the blow-out unit 31 has a motor 41 fixed to a casing 41, and a hub 43 of a centripetal fan 50 is fixed to an output shaft of the motor 42. The hub 43 has a substantially conical shape, and a plurality of blades 45 are fixed to the hub 43 at a predetermined angle at regular intervals to form an impeller 49. A lower portion 41a of the casing 41 is arranged along the lower side of the impeller 49.

The rotation of the impeller 49 of the centripetal fan 50 causes centripetal acceleration in the air from the outside in the radial direction toward the center, as shown by the arrow X, and blows the air forward in the axial direction. .

Lower part 41a of the casing 41 of the blowout unit 31
A tapered nozzle-shaped fan guide 46 is formed integrally therewith. The fan guide 46 guides the centripetal airflow blown from the centripetal fan 50 toward the center side.
Therefore, as shown by an arrow Y in FIG. 2, the swirling flow blown out from the blowing unit 31 is stronger in centripetal force generated by the centripetal fan 50 itself and the fan guide 46 than the centrifugal force caused by swirling. Then, it begins to contract.

As shown in FIG. 3, the connection hole 48 for the duct 34 of the blowout unit 3 is provided at a position eccentric to the center of the casing 41, and the suction flow by the impeller 49 of the centripetal fan 50 is the axis. I try to be symmetrical.

In the above configuration, the air sucked from the room 4 by the centrifugal fan 12 of the indoor unit 15 is the indoor heat exchanger 13
The heat is exchanged by and is sent to the blowing unit 31 through the duct 34.

In the blowing unit 31, the centripetal fan 5
By the rotation of the impeller 49 of 0, a swirling flow having centripetal force is generated inwardly with respect to the axial direction, and the fan guide 4
6 further strengthens the centripetal nature of the air flow.

The centripetal force formed by the centripetal fan 50 and the fan guide 46 is stronger than the centrifugal force due to the swirling flow immediately after being blown out from the blowout unit 31,
As shown in FIGS. 1 and 2, the jet shape is slightly reduced. Therefore, in the upper region H near the ceiling plate 8, that is, in the upper region H where it is not necessary to perform air conditioning, the airflow is sent downward without diffusion.

Then, in the lower region L from the floor surface 9 to about 2 m, the centripetal force of the air flow is lost due to the centrifugal force due to the swirling speed of the air flow and the diffusivity of the fluid, and the velocity is such that draft does not occur. The conditioned air is diffused as shown by the solid line. Regions A and B indicated by the solid line are regions where an appropriate thermal sensation can be obtained. And indoor unit 1
5 is inhaled through the suction port.

In this way, the centripetal fan 50 and the fan guide 46 of the blowout unit 31 eject a centripetal flow to make it a contracting flow near the ceiling and diffuse it downward, so that the broken line in FIG. The air conditioning region can be lowered downward as shown by the solid line in comparison with the conventional example shown. In particular, it is possible to prevent the airflow from rising during heating and when the flow rate is small, and to give a feeling of warmth and coolness to the living areas A and B in the high-ceiling indoor space 4.

Further, by controlling the rotation speeds of the centripetal fans 50, 50 of the two blowout units 31, 31, the temperature distribution in both regions A, B can be controlled.

Further, since the blowout unit 31 uses the centripetal fan 50 that sucks in from the outer peripheral direction with respect to the shaft and sends it forward in the axial direction, the axial thickness can be made smaller than that of an axial flow fan, and thus the ceiling. The space of the back space 1 can be reduced.

In the above embodiment, the centrifugal fan 12 is installed in the indoor unit 15.
However, it is also possible to use a mixed flow fan or the like outside this, and the air is sucked into the indoor unit by the suction force of the centripetal fan of the blowout unit without using a fan for the indoor unit. You may

<Effects of the Invention> As is clear from the above, the ceiling-mounted air conditioner of the present invention connects the indoor unit installed in the space above the ceiling and the blowout unit with a duct, and provides a centripetal fan to the blowout unit. Since it is provided, a jet with a slight contraction can be formed immediately after the air is blown out from the blowing unit. Therefore, the conditioned air is not diffused in the upper part of the high ceiling room, but the conditioned air is diffused in the lower part of the high ceiling room. The conditioned air can be distributed in the living space below
Especially when the amount of air blown out during heating is small,
Due to the buoyancy, it is possible to prevent the blowing airflow from rising and obtain a good temperature distribution in the living area.

Further, since the centripetal fan is used for the blowing unit, the thickness of the blowing unit in the axial direction can be reduced, and thus the space above the ceiling space can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of a blowout unit, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIGS. It is a sectional view of a ceiling-mounted air conditioner. 12 ... Centrifugal fan, 13 ... Indoor heat exchanger, 15
...... Indoor unit, 31 ...... Blowout unit, 50 ...
... centripetal fan.

Claims (1)

[Claims] 1. An outdoor unit having a compressor, an outdoor heat exchanger, a four-way switching valve and expansion means,
An indoor unit installed in the space above the ceiling and having an indoor heat exchanger, and a centripetal fan installed in the space above the ceiling and inhaling air from the circumferential direction or the direction oblique to the axis and blowing it forward in the axial direction. A ceiling-mounted air conditioner characterized in that it is connected to a blowout unit that it has by a duct.