KR20160059248A - Centrifugal Air Blower - Google Patents

Abstract

The present invention provides a centrifugal air blowing device including: an impeller (10) enabling air flowing into a central part to flow in a radial direction by rotating; a casing (20) receiving the impeller (10) therein to be able to rotate; and a driving motor unit (30) transmitting power to the impeller (10) while being arranged in one side of the casing (20). A hub (15) is formed in the central part of a lower plate of the impeller (10). A cap member (17) is formed on an end of the hub in an upper plate side of the impeller (10). According to the centrifugal air blowing device of the present invention, an air flow can be easily changed when the air sent into through a central hole of an upper plate of the impeller flows in a centrifugal direction toward a rotary blade as the cap member is formed in the end of the hub in the upper plate side of the impeller. Accordingly, an effect of reducing noise and a flow loss generated in the end of hub in the upper plate side of the impeller is obtained. The purpose of the present invention is to provide a centrifugal air blowing device with improved air blowing efficiency.

Description

[0001] Centrifugal Air Blower [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal fan system, and more particularly, to a centrifugal fan system capable of reducing noise generation and flow loss by applying a cap member to an impeller of a centrifugal fan system.

Centrifugal blowers range from low-pressure blowers used for ventilation and ventilation to blowers that compress gas to high pressure, which are classified into three categories: centrifugal fans, centrifugal blowers, and centrifugal compressors.

The principle of operation of the centrifugal blower is the same as the operation principle of the centrifugal pump. When the impeller rotates, the gas in the impeller becomes larger due to the centrifugal force and is pushed out of the rotary car. The gas pushed out of the impeller flows into the spiral casing through the inside of the spiral casing, and the velocity energy changes into the pressure energy.

 In the centrifugal blower, the pressure ratio of one compression end is larger than that of the axial flow blower, and the pressure change with respect to the change of the blowing amount is not large. Compared with volume type blowers, it is easy to adjust the blowing amount and there is no mechanical friction inside, so internal lubrication is not required.

On the other hand, the noise generated from the centrifugal blower is an interference caused by a sudden pressure change occurring when the impeller rotates in the casing and the rotating blade of the impeller passes through the blocking surface, There are vortices due to turbulence generated around the rotating blades or at the outlet, mechanical noises include noise due to bearing wear, structural noise caused by resonance of a part of the fan structure, and vibration of the structure equipped with the fan And a solid sound generated by the sound.

In the case of a centrifugal blower, the mechanical noise is not generally a problem, but it is closely related to the vibration of the blower, and aerodynamic noise is the main cause of noise generation. Therefore, to reduce the noise of the centrifugal blower, Aerodynamic aspects of design and casing design should be considered.

1 and 2 show an impeller of a conventional centrifugal blower. In the case of the conventional impeller 100, the end of the hub 150 on the side of the impeller upper plate 120 is formed with a step, so that the air introduced through the center hole of the impeller upper plate 120 is centrifugally There is a problem that noise is generated and flow loss is caused.

In the case of Patent Document 1, in order to reduce the aerodynamic noise of the centrifugal blower, the vibration reduction, or the flow loss due to the centrifugal blower, a main plate rotatable in a predetermined direction around the rotation axis, and wings arranged on the main plate, Wherein at least the radially outer end of the main plate including the trailing edge located on the outer peripheral side of the main plate is gently bent so as to protrude in the half rotation direction of the main plate, So that it is difficult to improve the flow loss due to the step of the hub end portion still formed on the impeller.

Korean Patent Registration No. 10-0635851 (October 19, 2006)

An object of the present invention is to provide a centrifugal type blower having improved blowing efficiency as a whole by improving noise generation and flow loss due to steps of a hub end portion formed in an impeller.

(1) According to the present invention, there is provided an air conditioner comprising: an impeller (10) for causing air flowing in a central portion to flow in a radial direction through rotation; A casing 20 for accommodating the impeller 10 in a rotatable state therein; And a driving motor unit (30) for transmitting power to the impeller (10) in a state of being disposed at one side of the casing (20); Wherein the impeller 10 has a hub 15 on the central portion of the impeller lower plate 11 and a cap 15 on the end of the hub 15 on the side of the impeller upper plate 12, (17) is formed on the outer circumferential surface of the outer circumferential surface.

(2) According to the present invention, there is provided a centrifugal fan according to the above (1), wherein the cap member (17) is conical.

(3) According to the present invention, there is provided a centrifugal fan according to (2), wherein a round portion 17a is formed at the tip of the cap member 17.

(4) According to the present invention, in any one of (1) to (3), at least one of a convex projection (17b) and a concave groove (17c) is formed on a side outer surface of the cap member To provide a centrifugal fan.

According to the centrifugal air blowing apparatus of the present invention, since the cap member is formed at the end of the hub on the impeller upper plate side, the flow of air flowing through the central hole of the impeller upper plate toward the rotary vane in the centrifugal direction is facilitated So that noise generation and flow loss generated at the end of the hub on the impeller upper plate side can be advantageously reduced.

1 is a side view showing an impeller of a conventional centrifugal fan.
2 is a front view showing an impeller of a conventional centrifugal fan.
3 is a side view showing the impeller of the centrifugal fan according to the present invention.
4 is a front view showing the impeller of the centrifugal fan according to the present invention.
5 to 7 are views showing another embodiment of the cap member of the present invention.
8 is a view showing a centrifugal fan according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The centrifugal fan apparatus of the present invention can be manufactured as an integral type or can be separately manufactured as required. In addition, some components may be omitted depending on the usage pattern.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected,""coupled," or "connected. &Quot;

3, 4 and 8, a centrifugal fan according to the present invention includes a casing 20 for accommodating therein an impeller 10, an impeller 10 in a rotatable state, And a driving motor unit 30 coupled to the impeller 10 so as to transmit power.

The impeller 10 includes a lower impeller plate 11, an impeller upper plate 12 spaced apart from the impeller lower plate 11 by a predetermined distance, a rotary vane 13 disposed between the lower impeller plate 11 and the impeller upper plate 12, An air inlet 14 formed on the upper plate 12 and a hub 15 coupled to the central portion of the impeller lower plate 11; a rotary shaft hole 16 formed in the hub 15; And a cap member 17 coupled to the cap member.

The edge portion of the rotary blade 13 includes a blade vertical end extending vertically from the upper surface of the impeller lower plate 11 and a blade inclined end inclined toward the central portion of the impeller 10 at the blade vertical end. As described above, the shape of the edge of the rotary vane 13 can be formed in multiple stages, but the present invention is not limited thereto, and may include various shapes such as a curved surface, a spiral, and a straight line as a whole.

The casing 20 includes an outer casing 21, an inner casing 22 coupled to the opening of the outer casing 21, and an air outlet 23 protruding from one side of the outer periphery of the casing 20.

3 and 4, the impeller 10 of the centrifugal fan according to the present invention will be described in more detail.

In the case of the impeller 10 of the centrifugal air blowing apparatus according to the present invention, the cap member 17 is formed at the end of the hub 15 on the impeller upper plate 12 side. The cap member 17 has a substantially conical shape. The cap member 17 may be coupled to the end of the hub 15 on the side of the impeller upper plate 12 by a known joining method. Since the cap member 17 is formed at the end of the hub 15 on the impeller upper plate 12 side in the case of the impeller 10 of the centrifugal fan apparatus according to the present invention, The flow of the air can be easily changed when the air flows in the centrifugal direction toward the rotary vane 13 and noise generation and flow loss generated at the end of the hub 15 on the impeller upper plate 12 side can be reduced .

5 to 7 are views showing another embodiment of the cap member of the present invention. According to another preferred embodiment of the cap member 17 of the present invention, the rounded portion 17a is formed at the tip end portion of the cap member 17. Therefore, it is possible to reduce the noise generation and the flow loss caused by the vortex generated in the tip portion of the cap member 17. [

Alternatively, according to another preferred embodiment of the cap member 17 of the present invention, the convex projection 17b and / or the concave groove 17c are formed on the side outer surface of the cap member 17. Therefore, it is possible to reduce the noise generation and the flow loss caused by the adhesive flow of the side surface of the cap member 17.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is clear that the present invention can be suitably modified and applied in the same manner. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

10: Impeller
11: impeller bottom plate
12: Impeller top plate
13: Rotating blade
14: Air inlet
15: Hub
16:
17: cap member
17a:
17b: convex projection
17c: concave groove
20: casing
21: outer casing
22: Inner casing
23: Air outlet
30: drive motor section

Claims (4)

An impeller (10) for causing air flowing in a central portion to flow in a radial direction through rotary driving;
A casing 20 for accommodating the impeller 10 in a rotatable state therein; And
A driving motor unit 30 for transmitting power to the impeller 10 in a state of being disposed at one side of the casing 20; The centrifugal fan device according to claim 1,
The impeller 10 is characterized in that a hub 15 is formed on the central portion of the impeller lower plate 11 and a cap member 17 is formed on an end of the hub 15 on the side of the impeller upper plate 12 A centrifugal blower. The method according to claim 1,
Wherein the cap member (17) is conical. 3. The method of claim 2,
Wherein a round portion (17a) is formed at the tip of the cap member (17). 4. The method according to any one of claims 1 to 3,
Wherein at least one of a convex projection (17b) and a concave groove (17c) is formed on a side outer surface of the cap member (17).

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