JPH0743147B2 - Ceiling embedded air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ceiling-embedded air conditioner equipped with a turbo fan, and more particularly to measures for reducing required power.

(Prior Art) Conventionally, as disclosed in JP-A-62-194128,
In an air conditioner that has a suction port at the center of the main body casing embedded in the ceiling, a blowout port at the periphery, and a fan at the center of the main body casing, suspends the drain pan that has a curved shape in the air blowing direction. It is a well-known technique to reduce the blowing noise during the operation of the air conditioner by providing a metal fitting and generating a radial arc-shaped air flow from the suction port toward the air outlet in the casing body.

(Problems to be Solved by the Invention) By the way, in the above case, when the air velocity distribution of the air blow on the front surface of the heat exchanger is viewed microscopically, as shown in FIG. When bent into a substantially arc shape, a phenomenon occurs in which the flow of air separates from the shroud (b) of the fan (a) due to centrifugal force. Due to this separation phenomenon, the air volume is large above the front surface (d) of the heat exchanger (c) and small below it, and the air velocity distribution is non-uniform. Therefore, the heat exchange efficiency deteriorates and the required power increases. Further, because of this, the wind speed is increased in order to secure the heat exchange capacity, so there is a problem that the blowing noise becomes high.

On the other hand, for example, by increasing the distance between the fan (a) and the heat exchanger (c), the wind velocity distribution on the front surface (d) of the heat exchanger (c) can be made relatively uniform. It will lead to shaping.

The present invention has been made in view of such a point, and an object thereof is to effectively reduce the separation area from the fan shroud of the blower while maintaining the compactness of the device, and thereby to reduce the wind speed in the front surface of the heat exchanger. The aim is to make the distribution uniform.

(Means for Solving the Problem) In order to achieve the above object, a solution means of the present invention is to provide a guide member for adhering a flow of air downward in the vicinity of the shroud of the fan.

Specifically, as shown in FIGS. 1 and 2, the main casing (1) embedded in the ceiling surface has a suction port (2) in the center of the lower surface (1a) and an outlet (around the lower surface (1a) ( 3) is provided, and an air passage (5) is formed in the main body casing (1) for communicating the suction port (2) with the air outlet (3), and the air passage (5) is provided with the suction port. A turbo-type fan (4) having a vertical rotating shaft is provided so as to face (2),
It is premised on a ceiling-embedded air conditioner provided with a heat exchanger (6) at a predetermined distance in the outer peripheral direction of the fan (4).

Then, between the fan (4) and the heat exchanger (6),
A ring-shaped guide member (7) having an upper surface (7a) formed in a streamlined shape is arranged such that the inner peripheral portion of the upper surface (7c) is close to the outer peripheral portion of the lower surface (4b) of the shroud (4a) of the fan (4), and The configuration is such that they are arranged so as to overlap each other.

(Operation) With the above configuration, in the present invention, the main body casing (1)
In the air passage (5) inside, a flow of wind that is bent from the suction port (2) toward the air outlet (3) is generated, and the flow is shrouded (4a) on the shroud (4a) side of the fan (4).
Subject to centrifugal force in the direction of separation from a).

In that case, the inner peripheral portion of the upper surface (7a) of the guide member (7) is arranged so as to be close to and overlap the outer peripheral portion of the lower surface (4b) of the shroud (4a), and the upper surface (7a)
Are formed in a streamlined manner, the wind on the shroud (4a) side of the fan (4) is attracted downward due to the Coanda effect of adhering to the guide member (7). Therefore, the wind velocity distribution of the wind flow in the heat exchanger (6) becomes substantially uniform in the vertical direction of the heat exchanger (6), and the heat exchange efficiency improves. Therefore, the compactness of the device is maintained and the required power and the blowing noise are reduced without inviting an increase in the size of the device and an increase in the air volume.

(Example) Hereinafter, an example of the present invention will be described with reference to Figs.

1 to 3 show the structure of a ceiling-embedded air conditioner according to an embodiment of the present invention, (1) is a main body casing of the air conditioner embedded in a ceiling surface, and (2) is the main body. Room air intake provided in the center of the lower surface (1a) of the casing (1), and (3) air-conditioning air outlets provided at three peripheral portions of the lower surface (1a), which are the main casing ( Inside 1), an air passage (5) is formed which connects the suction port (2) and the air outlet (3). And
In the air passage (5), the main body casing (1)
A turbo fan (4), which is rotationally driven around a vertical rotation axis by a motor (M), is installed in the center of the inside so as to face the suction port (2), and is located downstream of the fan (4). A heat exchanger (6) for exchanging heat between the refrigerant and air is installed on the side away from the outer periphery of the fan (4) by a predetermined distance.

As a feature of the present invention, a ring-shaped guide member (7) is provided between the fan (4) and the heat exchanger (6) of the main body casing (1). The guide member (7) has a wing-shaped radial cross section as shown in an enlarged detail in FIG. 2, and has a streamlined upper surface (7a) formed of an arc and the upper surface (7a). Inner circumference (7c) and outer circumference (7d)
The lower surface of the shroud (4a) is below the shroud (4a) of the fan (4), and the inner peripheral part of the upper surface (7a) is below the shroud (4a). It is arranged so as to be close to and overlap the outer peripheral portion. The outer periphery (7d) of the guide member (7) is formed at a position with a predetermined gap from the front surface of the heat exchanger (6).

That is, in the flow of air blown by the fan (4), the airflow is attracted downward by utilizing the so-called Coanda effect in which the airflow adheres to the wing-shaped upper surface (7a) of the guide member (7), It is designed to reduce the separation area from the shroud (4a).

Therefore, in the above embodiment, when the device is in operation, the indoor air is taken in from the suction port (2) by the fan (4), and after the heat exchange with the refrigerant in the heat exchanger (6), the conditioned air is discharged from the air outlet (3). Is supplied indoors.

In that case, the turbo type fan (4) is used to connect the lower surface (1a) of the main casing (1) to the lower surface (1a) from the central suction port (2).
A radial air flow that is bent toward the peripheral air outlet (3) is generated, and due to the centrifugal force, the wind flow is separated from the shroud (4a) of the fan (4), and the front surface of the heat exchanger (6). In (6a), there is a risk that the wind velocity is high in the upper part and small in the lower part.

However, in the present invention, the ring-shaped guide member (7) having the upper surface (7a) formed in a streamlined shape has the inner peripheral portion of the upper surface (7a) of the lower surface (7b) of the shroud (4a) of the fan (4). Since they are arranged close to each other so as to overlap with the outer peripheral part of the fan, the flow on the shroud (4a) side of the fan (4) adheres to the upper surface (7a) of the guide member (7) to cause the Coanda effect. Flow is drawn downward, and the separation area of the wind flow from the shroud (4a) is effectively reduced. Therefore, as shown in FIG. 4, the front surface (6a) of the heat exchanger (6).
The wind velocity distribution in is substantially uniform in the vertical direction, and the heat exchange efficiency of the heat exchanger (6) is improved. Further, as a result, there is no need to increase the distance between the fan (4) and the heat exchanger (6) or the air volume of the fan (4), and
The required power and the blowing noise can be reduced while maintaining the compactness of the device.

(Effects of the Invention) As described above, according to the present invention, in the main body casing of the ceiling-embedded air conditioner including the turbo-type fan, the upper surface is streamlined just below the fan shroud. Since the ring-shaped guide member is provided so that the inner peripheral surface of the upper surface thereof is close to and overlaps the outer peripheral surface of the lower surface of the shroud, the separation area of the wind flow from the shroud can be effectively reduced, and the heat exchanger can be reduced. The heat exchange efficiency can be improved by making the wind velocity distribution on the front side uniform. Therefore, it is possible to reduce the required power and the blowing noise while maintaining the compactness of the device.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view showing the overall configuration of an indoor unit of a ceiling-embedded air conditioner, and FIG. 2 is a positional relationship between a guide member and a fan. 1 is a partially enlarged view of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a wind velocity distribution map of the front surface of the heat exchanger according to the present invention. FIG. 5 is a wind velocity distribution diagram in front of the heat exchanger in the conventional device. (1) …… Main body casing, (1a) …… Bottom surface, (2)…
… Suction port, (3) …… Blowout port, (4) …… Fan, (4
a) …… Shroud, (4b) …… Bottom surface, (5) …… Air passage, (6) …… Heat exchanger, (7) …… Guide member,
(7a) …… Top surface.

Claims (1)

[Claims] 1. A main body casing (1) embedded in a ceiling surface is provided with a suction port (2) in the center of a lower surface (1a) and an air outlet (3) around the lower surface (1a). Is formed with an air passage (5) that communicates the suction port (2) and the air outlet (3), and the air passage (5) faces the suction port (2) in the vertical rotation axis. A ceiling-embedded air conditioner provided with a turbo-type fan (4) having a heat exchanger (6) at a predetermined distance in the outer peripheral direction of the fan (4). Between the heat exchanger (6) and the heat exchanger (6), a ring-shaped guide member (7) having a streamlined upper surface (7a) is provided inside the upper surface of the shroud (4a) of the fan (4). A ceiling-embedded air conditioner characterized by being arranged close to the outer periphery of the lower surface (4b) and overlapping with each other. .