KR101270250B1

KR101270250B1 - Radial-flow fan

Info

Publication number: KR101270250B1
Application number: KR1020100095127A
Authority: KR
Inventors: 김정환; 정재구
Original assignee: 주식회사 힘펠
Priority date: 2010-09-30
Filing date: 2010-09-30
Publication date: 2013-05-31
Also published as: KR20120033551A

Abstract

The present invention relates to a centrifugal blower in which air flow is guided by a scroll casing of a scroll structure. In particular, the present invention is an impeller for flowing air; And a scroll casing having an impeller installed therein, having an inlet through which air is introduced by the impeller, and an outlet through which air is discharged, and having a noise preventing part for canceling the discharge noise of the air by the impeller. Present a centrifugal blower.

Description

Centrifugal Blower {RADIAL-FLOW FAN}

The present invention relates to a centrifugal blower in which air flow is guided by a scroll casing of a scroll structure.

Centrifugal blowers are widely used for ventilation to maintain a pleasant indoor environment by forcibly exhausting polluted air and odors of buildings such as houses and business facilities.

These centrifugal blowers are forced to flow the air at a large pressure, and noise is generated due to vortex generation, flow collision, and the like. In particular, the centrifugal blower generates a lot of noise inside the scroll casing and the discharge side due to the high speed rotation of the impeller.

However, since the centrifugal blower is installed in a manner that is embedded in the ceiling or the ceiling of the interior of the building, noise generated by the centrifugal blower is inconvenient for the user, and efforts have been made to reduce it.

Furthermore, a method of preventing noise generated from the centrifugal blower but not degrading the performance of the centrifugal blower is also required.

The present invention has been made to solve the above problems, and to provide a centrifugal blower of low noise structure that can cancel the scroll noise of the impeller and the discharge noise of the discharge side without affecting the performance of the blower.

The present invention to solve the above problems is an impeller for flowing air; And a scroll casing having an impeller installed therein, having an inlet through which air is introduced by the impeller, and an outlet through which air is discharged, and having a noise preventing part for canceling the discharge noise of the air by the impeller. Present a centrifugal blower.

The noise prevention part may be formed outside the flow path through which air of the scroll casing flows.

At the exit side of the main body portion in which the flow passage of the scroll casing is formed, an opening is formed in the circumferential surface thereof so that the discharge noise of the air by the impeller can be transmitted to the noise prevention portion, and communicates with the opening of the main body portion of the scroll casing. It may comprise a chamber.

An entrance guide part protruding toward the inside of the chamber may be formed in an opening of the main body part of the scroll casing to guide the incidence of noise.

The present invention also provides an impeller for flowing air; A scroll casing having an impeller installed therein and having an inlet through which air is introduced by the impeller and an outlet through which air is discharged; The scroll casing is built-in, has an inlet portion through which air enters and an outlet portion of the scroll casing and has a discharge portion protruding outward a predetermined length, and the discharge portion has a noise preventing portion for canceling the discharge noise of air by an impeller. It presents together with a centrifugal blower comprising a body;

The noise prevention part may include a chamber formed inside the discharge part so as to be positioned outside the discharge flow path of the discharge part, and having an opening that is opened to transmit discharge noise of air discharged through the discharge part.

The noise prevention part may be connected to an outer surface of the body and may be formed to be shorter than the discharge part along the discharge part, and an opening of the chamber may be formed on the surface opposite to the outer surface of the body along the discharge part.

An entrance guide part protruding toward the inside of the chamber may be formed in the opening of the chamber to guide the incidence of noise.

As described above, according to the present invention, various effects including the following can be expected. However, the present invention does not necessarily achieve the following effects.

First, a low noise centrifugal blower can be presented because the noise of the air can be canceled by the noise preventing unit.

In particular, as the noise prevention unit is configured to cancel the discharge noise of the air, the noise prevention unit can be easily configured without interference with the scroll housing or the impeller.

In addition, as the noise prevention portion is configured to cancel the discharge noise of the air, it is possible to exclude the influence on the air flow in the flow path of the scroll housing.

In addition, as the noise prevention part is configured around the flow path of the scroll housing or around the flow path of the discharge part of the body, it is possible to effectively cancel the discharge noise of the air without disturbing the air flow by the impeller.

1 is a schematic diagram of a centrifugal blower according to a first embodiment of the present invention.
2 is a cross-sectional view of the centrifugal blower according to the first embodiment of the present invention.
3 is a side view of the scroll casing of FIG.
Figure 4 is a front view of the discharge portion of the centrifugal blower according to the second embodiment of the present invention.
Figure 5 is a cross-sectional view of the discharge portion of the centrifugal blower according to the second embodiment of the present invention.
6 is a static pressure graph of the air volume of the first experimental example.
7 is a noise graph of the first experimental example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations will be omitted so as not to obscure the gist of the present invention. For reference, 'arrow A' shown in the drawing indicates the discharge flow of air by the impeller 20, 'arrow B' indicates the noise incident to the noise prevention unit.

1 to 3 relate to a centrifugal blower according to a first embodiment of the present invention.

1 to 3, the centrifugal blower according to the first embodiment of the present invention, the scroll casing of the spiral structure having an inlet (10A) through which air enters, and an outlet (10B) through which air is discharged ( 10); An impeller 20 installed in the scroll casing 10 so as to flow air from the inlet 10A of the scroll casing 10 toward the outlet 10B, and the impeller 20 in the scroll casing 10. Noise canceling unit (hereinafter referred to as 'first noise prevention unit 14' for convenience of description) to offset the discharge noise of the air is characterized in that it is formed.

In particular, the first noise protection unit 14 may be configured on the outlet 10B side of the scroll casing 10 so that air can be canceled while the air flows to the outlet 10B of the scroll casing 10.

That is, the scroll casing 10 may be formed of a main body 12 having a flow path 10C through which the air flows by the impeller 20, and the first noise preventing unit 14. The main body portion 12 of the scroll casing 10 is formed with an inlet 10A through which air is introduced and extends from the scroll shape 12A and the scroll shape 12A on which the impeller 20 is located, and thus the outlet 10B. ) May include an extension part 12B, and the first noise prevention part 14 may be configured to correspond to the extension part 12B of the main body part 12.

In this case, as the first noise prevention unit 14 is configured to cancel the discharge noise of the air, noise by the impeller 20 is not affected without affecting the air flow in the flow path 10C of the main body 12. Can be offset. In addition, the scroll-shaped portion 12A of the main body portion 12 has a small space due to the installation of the impeller 20. As the first noise prevention portion 14 is configured to cancel the discharge noise of air, 1 noise prevention portion 14 can be easily configured without interference problems such as structure.

Furthermore, the first noise prevention unit 14 may be configured outside the flow path 10C of the main body unit 12. That is, the first noise prevention unit 14 may not be configured in the flow path 10C of the main body part 12 but may be configured around the flow path 10C of the main body part 12. Therefore, the first noise prevention unit 14 may be configured not to disturb the air flow of the impeller 20 so as to cancel only the discharge noise. In particular, one of the main causes of the noise discharge of the air of the impeller 20 is the vortex phenomenon caused by the air flow hit the scroll casing 10 at the edge of the flow path (10C) of the body portion 12, the first noise prevention As the part 14 is installed outside the flow path 10C of the main body part 12, noise caused by the vortex of the edge of the flow path 10C of the main body part 12 directly enters the first noise preventing part 14. And can be offset, the offset effect of the air discharge noise can be very excellent.

To this end, the opening 10B side of the scroll casing 10, that is, the opening 12B of the main body 12, is opened to allow noise to enter the first noise prevention portion 14 on the circumferential surface thereof. 10D is formed; The first noise prevention portion 14 is connected to the circumferential surface of the outlet 10B side of the body portion 12 and has a predetermined internal space 14A communicating with the opening 10D of the body portion 12. Chamber 14 '.

That is, the air discharge noise is incident on the first chamber 14 'through the opening 10D of the main body 12, and the noise incident on the first chamber 14' is reflected and offset by the resonance absorption phenomenon. The discharge noise of the air can be prevented.

As shown in FIG. 3, the opening 10D of the main body 12 may have a slot structure extending from the upper side to the lower side until the lower end 12C of the main body 12. In this case, since one of the openings 10D of the main body part 12 is open, the mold design for drawing out the main body part 12 when the mold of the main body part 12 is manufactured can be easily and simply made. Of course, the opening 10D of the body portion 12 is not necessarily limited to the slot structure, but may be formed in various ways, for example, a hole structure, although not shown.

At this time, the size of the opening 10D of the body portion 12, the shape of the first chamber 14 ', the size, etc. may be variously made according to the structure of the impeller 20, scroll casing 10, and the like. .

On the other hand, in the opening 10D of the main body 12, a first incidence guide portion 10E is formed to protrude toward the inside of the first chamber 14 'to guide the incidence of noise, thereby making noise incidence more smoothly. The noise reflection and offset in the first chamber 14 'can be made more smoothly.

Such a first noise prevention portion 14 may be configured around the periphery of the extension portion 12B of the main body portion 12, or may be configured only on a portion thereof.

Meanwhile, reference numeral '30' indicated in FIG. 1 constitutes an external appearance of a centrifugal blower, in which a scroll casing 10 is built-in, and is connected to an air inlet and an outlet 10B of the scroll casing 10. And a body 30 having a discharge part 34 protruding a predetermined length outward. The inlet portion of the body 30 is made of the inlet portion 32 of the tubular structure like the discharge portion 34 in response to the case where the centrifugal blower according to the present invention is embedded in the ceiling, or the centrifugal blower according to the present invention is ceiling The lower side of the body 30 may be formed in the form of an open box in response to the case of being installed in the case, and the grill cover 36 having a grill structure may be installed on the open lower side of the body 30.

4 and 5 are related to the centrifugal blower according to the second embodiment of the present invention.

As shown in Figure 4 and 5, the centrifugal blower according to the second embodiment of the present invention is a noise prevention unit (hereinafter referred to as 'second noise prevention unit 60' for convenience of explanation) the body It may be characterized in that formed in the discharge portion 34 of the (30).

In particular, the second noise prevention part 60 is formed inside the discharge part 34, and is positioned outside the discharge flow path 34A through which the air flow by the impeller 20 of the discharge part 34 is discharged. The second chamber 62 may include an opening 62A through which the discharge noise of the air discharged through the discharge part 34 is incident.

In this case, after the air flow by the impeller 20 is discharged from the scroll casing 10, since the discharge noise of the air can be canceled by the second noise prevention part 60, the second noise prevention part 60 It is possible to prevent the flow resistance of the air by the impeller 20 due to the cancellation of the discharge noise of the air by. In addition, around the discharge passage 34A of the discharge part 34 of the body 30 so that the second noise prevention part 60 does not interfere with the flow of air discharged through the discharge part 34 of the body 30. Can be configured.

Further, the second noise prevention part 60 is connected to the outer surface of the body 30 and is formed to be shorter than the discharge part 34 along the discharge part 34, and along the discharge part 34 of the body 30. An opening 62A of the second chamber 62 may be formed on the surface opposite to the outer surface. Therefore, although the second noise prevention part 60 is configured to cancel the discharge noise of the air discharged from the scroll casing 10, as the second noise prevention unit 60 is configured inside the discharge portion 34, the discharge noise of the air is the body 30. The light incident on the second chamber 62 of the second noise prevention part 60 may be reflected and canceled before going outside of the second noise prevention part 60.

In addition, a second incident guide part 62B may be formed in the opening 62A of the second chamber 62 to protrude toward the inside of the second chamber 62 to guide the incidence of noise.

As shown in FIGS. 4 and 5, the second noise preventing unit 60 may be configured at one side of each of the second discharge paths 34 around the discharge passage 34A of the discharge unit 34. 34 may be configured only on one side of the discharge passage 34A.

Hereinafter, the second embodiment of the present invention is the same as the first embodiment of the present invention, except that the second noise prevention unit 60 is configured in the discharge portion 34 of the body 30, it will be implemented similarly. As can be seen, the description overlapping with the first embodiment of the present invention will be omitted.

Hereinafter, the noise canceling effect by the first noise prevention unit 14 and the second noise prevention unit 60 described above will be described as follows.

[Table 1] and FIG. 6 and FIG. 7 show the case where the noise preventing unit is not applied (# 1) and the second noise preventing unit based on the centrifugal blower models of the first and second embodiments of the present invention. When 60 is applied only to the discharge portion 34 of the body 30 (# 2), the first noise prevention portion 14 is applied to the scroll casing 10 and the second noise prevention portion 60 is applied. It relates to experimental data when applied to the discharge part 34 of the body 30 (# 3).

6 and 7, it can be seen that there is almost no change in the airflow performance of the centrifugal blower due to the first noise preventing unit 14 and the second noise preventing unit 60. In addition, when the second noise protection unit 60 is applied only to the discharge unit 34 of the body 30 (# 2), the noise is approximately 0.5 dB lower than that when the noise protection unit is not applied (# 1). When the first noise protection unit 14 is applied to the scroll casing 10 and the second noise protection unit 60 is applied to the discharge unit 34 of the body 30 (# 3), noise is generated. You can see that it is about 2.8 dB lower.

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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

10; Scroll casing 12A; Scroll formation
12B; Extension 12; The body portion
14; First noise prevention unit 20; Impeller
30; Body 34; The discharge portion
60; 2nd noise prevention part

Claims

An impeller for flowing air;
A scroll casing having an impeller installed therein, having an inlet through which air is introduced by the impeller, and an outlet through which air is discharged, and having a first noise preventing part for canceling the discharge noise of the air by the impeller; And
The scroll casing is installed in a built-in, the air inlet and the outlet of the scroll casing has a discharge portion protruding a predetermined length to the outside, the second noise to cancel the discharge noise of the air by the impeller in the discharge portion Body formed with the prevention portion;
Including;
The second noise protection unit,
A second chamber positioned outside the discharge passage through which the air flow is discharged and having an opening through which discharge noise is incident;
Centrifugal blower comprising a.

The method according to claim 1,
The first noise preventing unit is a centrifugal blower, characterized in that formed on the outside of the flow path of the scroll casing through which air flows by the impeller.

The method according to claim 2,
At the exit side of the body portion in which the flow passage of the scroll casing is formed, an opening is formed in the circumferential surface thereof so that the discharge noise of the air by the impeller can be transmitted to the first noise prevention unit.
And the first noise preventing part includes a first chamber connected to an outlet side circumferential surface of the scroll casing and in communication with an opening of the main body part.

The method according to claim 3,
Centrifugal blower, characterized in that the inlet is formed in the opening portion of the main body protruding toward the interior of the first chamber to guide the incidence of noise.

delete

The method according to claim 1,
The second noise preventing part is connected to an outer surface of the body and is formed shorter than the discharge part along the discharge part, and an opening of the second chamber is formed on the surface opposite to the outer surface of the body along the discharge part. Centrifugal blower.

The method of claim 7,
Centrifugal blower, characterized in that the inlet of the second chamber is formed in the inlet guide portion protruding toward the inside of the second chamber to guide the incidence of noise.