JPH0120601Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air conditioner, particularly an air conditioner installed in a ceiling.

(Prior Art) In recent years, as shown in Fig. 2, conditioned air supplied from an air conditioner 1 is discharged into the attic space 2, and air blowers (ductless fans) 4 are installed at three locations on the ceiling as necessary. , 4... have proposed an air conditioning system that supplies air to the room 5 [see Proceedings of the Air Conditioning and Sanitation Industry Association (1981), p. 289].

On the other hand, as part of reducing construction costs, there is a strong tendency to reduce the space behind the ceiling as much as possible and reduce the amount of materials used such as concrete, and for that reason as well, it is recommended to adopt the air conditioning system using the ductless fan described above. However, it is attracting attention in terms of reducing air conditioning construction costs.

Conventionally, as the ductless fan 4, an axial flow type blower as shown in FIG. 3 has been adopted. That is, a propeller-shaped impeller 6
and a fan motor 7 that directly drives this,
A blower 4 is installed on a ceiling surface 3 and is used by integrally assembling a guide 8 and a front panel 9 to form a flow path for guiding air discharged by an impeller 6 to the outside. Code 10 is a suction port, 11
is the discharge port.

(Problems to be solved by the invention) In the above conventional technology, since the height of the attic space 2 is greatly limited, the suction side space S behind the blower 4 is limited, and the air flow f is The leading and trailing edges of the impeller 6 are forced to bend significantly. As a result, backflow vortices are generated on the leading edge hub side A and the trailing edge hub side B of the impeller 6, resulting in problems such as a decrease in air blowing performance and an increase in operating noise.

On the other hand, to deal with this problem, blower 4
However, if this is done, it becomes necessary to enlarge the attic space 2, which raises the problem of increased construction costs and air conditioning running costs.

The present invention has been made in view of the above-mentioned problems, and aims to provide an air conditioner that can provide good operating performance and operate with low operating noise even in a very small attic space.

(Means for solving the problem) The present invention, as a means for solving the above problem, moves the impeller 6 of the blower 4 installed in the attic space 2 diagonally inward as shown in FIG. A hub 12 having a substantially monoplane double-sided outer circumferential surface consisting of a front curved surface 16 that produces centripetal acceleration, and a rear curved surface 17 that produces axial flow acceleration in the axial direction or diagonal flow acceleration diagonally outward; It is characterized by being constructed by a plurality of blades 13, 13, . . . implanted on the outer peripheral surface of the hub 12.

(Function) In the present invention, the following effects can be obtained by the above-mentioned means.

That is, centripetal acceleration diagonally inward is obtained on the suction side of the impeller 6, and axial flow acceleration in the axial direction or diagonal flow acceleration diagonally outward is obtained on the discharge side of the impeller 6. Even if the space S behind the blower 4 is small, suction from the side of the blower 4 is possible, and a smooth airflow f can be obtained despite the installation in the extremely small attic space 2.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As explained in the prior art section, this air conditioner is also configured with blowers 4, 4... installed in the attic space 2 from which the conditioned air supplied from the air conditioner 1 is released. The room 5 can be air-conditioned by the conditioned air blown out from the air conditioners 4, 4, . . . Reference numeral 19 is a blower for sucking air into the air conditioner 1.

The blower 4 includes an impeller 6, a fan motor 7 that directly drives the impeller 6, a guide 8 for forming a flow path for guiding the air discharged by the impeller 6 to the outside, and a front panel. 9 and a casing 14 are integrally assembled.

The impeller 6 is constructed by planting a plurality of blades 13, 13, .

The outer circumferential surface of the hub 12 has a concave shape such that the radius of the intermediate portion is smaller than the radius of the leading edge and the radius of the trailing edge. That is, the diameter of the front curved surface 16 from the front edge to the middle portion is gradually reduced, while the diameter of the rear curved surface 17 from the middle portion to the rear edge is gradually expanded. A main plate part 18 to which the drive shaft 20 of the fan motor 7 is connected is provided approximately at the center of the inner surface of the hub 12, and is made of synthetic resin and is integrally molded.

The front edge 13a of each blade 13 is inclined so that the tip side, which is the outer diameter side, is located on the rear edge side (in other words, the discharge side) than the hub side, which is the inner diameter side. A conical annular area is formed on the blowing side of the impeller 6 so that the air flow f can be blown into the impeller 6 smoothly.

On the other hand, the rear edge portion 13b of each blade 13 is inclined such that the tip side, which is the outer diameter side, is located closer to the front edge side (in other words, the suction side) than the hub side, which is the inner diameter side.

This impeller 6 acts so as to cause diagonally inward centripetal acceleration in the first half of each blade channel, and to cause obliquely outward diagonal flow acceleration in the second half. In addition,
The rear curved surface 17 on the outer periphery of the hub 12 is formed into a cylindrical shape,
In the impeller 6, axial flow acceleration in the axial direction may be generated in the rear half of each blade internal flow path.

The fan motor 7 is attached to the back panel 15 of the casing 14, and the fan motor 7 is attached to the back panel 15 of the casing 14.
Only a small space S is formed between 5 and the impeller 6. Therefore, the height h of the blower 4 can be kept low, and it can be installed even in buildings where the height H of the attic space 2 is restricted to be extremely low. Reference numeral 21 indicates a structural member in the attic.

Note that the casing 14 is provided with a suction port 10 and a discharge port 11.

Further, the front panel 9 of the casing 14 has an impeller 6
It covers the front of the room and has a sound insulating effect.

Next, the operation of this air conditioner will be explained.

The conditioned air f supplied from the air conditioner 1 (see Figure 2) and released into the attic space 2 is sucked in by the impeller 6 in each blower 4 by centripetal acceleration diagonally inward. Thereafter, the air is blown out as a result of acceleration of diagonal outward diagonal flow, and the interior of the room 5 is air-conditioned.

In the illustrated embodiment, the blower 4 is attached to the ceiling surface 3, but it goes without saying that it may be suspended from the structural member 21.

(Effect of the invention) As described above, according to the invention, the blower 4, which generates centripetal acceleration diagonally inward on the suction side and axial acceleration or diagonal acceleration diagonally outward on the discharge side, is installed in the ceiling. Since it is installed in the space 2, it has the practical effect of being much superior to conventional axial flow blowers in terms of operating performance and operating noise even in the extremely small attic space 2.

Furthermore, since there is no need to enlarge the attic space 2, there is also the effect that it is advantageous in reducing construction costs and air conditioning running costs.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an air conditioner according to an embodiment of the present invention, FIG. 2 is a system diagram showing an example of an air conditioning system employed in a building, and FIG.
The figure is a longitudinal sectional view of a conventional air conditioner. 1...Air conditioner, 2...Attic space, 4...
Blower, 6... Impeller, 7... Fan motor, 8
...Guide, 9...Front panel, 12...Hub,
13...Blade, 16...Front curved surface, 17...Rear curved surface.

Claims (1)

[Scope of utility model registration request] A blower 4 is constructed by integrally assembling an impeller 6, a fan motor 7 that directly drives the impeller, a guide 8 and a front panel 9 for forming a flow path for guiding discharged air to the outside. This air conditioner is installed in an attic space 2 that serves as a passage for conditioned air supplied from an air conditioner 1, and the impeller 6 of the blower 4 causes diagonally inward centripetal acceleration. A hub 12 has a substantially monoplane hyperboloid outer circumferential surface consisting of a front curved surface 16 and a rear curved surface 17 that produces axial flow acceleration in the axial direction or diagonal flow acceleration diagonally outward; An air conditioner comprising a plurality of blades 13, 13, . . .