KR101850287B1 - Fan flow rate of correction and Low noise operation type Centrifugal impella fan - Google Patents

Abstract

The present invention relates to a structure of an impeller of a centrifugal blowing fan capable of correcting a flow rate of blowing air and realizing low noise operation. According to the present invention, the structure is applied to a bidirectional centrifugal fan wherein an impeller installed inside the center of a centrifugal fan housing to be able to rotate and a driving motor are inserted into one side of the centrifugal fan housing to operate the impeller. A sectioning rib is formed in an annular shape around the outer circumference of the center of the impeller to form first and second sectioned blade areas, a plurality of connection ribs connected to the outer circumferential surface of a bearing housing to surround a bearing of the center from the inside of the sectioning rib is radially formed at intervals, and a mixing hole is formed between the connection ribs, thereby mixing air supplied from both directions of the centrifugal fan and transferring the mixed air towards a discharge hole in a low noise and low resistance state. Accordingly, an existing partition plate formed to cross the center of the impeller applied to the bidirectional centrifugal fan to form the first and second divided areas is removed, the connection rib continued to the center from the sectioning rib sectioning the first and second blade areas is formed, and the mixing hole which is a separation space is formed between the connection ribs, thereby allowing a flow rate of air supplied from both directions to be naturally controlled and then discharged through the discharge hole of the centrifugal fan. Thus, a nonuniform suction resistance is eliminated by correction of the flow rate of the air supplied from both directions in the bidirectional centrifugal fan, noise generated when the air supplied from the outside is sucked is minimized, and vibration is prevented to reduce noise; thereby improving fan performance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a centrifugal blower fan having a fan flow rate correction and a low noise operation type centrifugal impeller fan,

More particularly, the present invention relates to an impeller structure applied to a sirocco fan, which is a kind of centrifugal blower fan, and more particularly, to an impeller structure applied to a centrifugal fan fan, The present invention relates to an impeller structure of a centrifugal type blower fan capable of correcting a blowing flow rate, which is an amount of air flowing in both directions by removing a dividing partition wall, and minimizing the resistance of the inflow fluid to enable low noise operation.

The centrifugal fan is a fan that allows the fluid to be sucked in the axial direction to be forcibly blown in the centrifugal direction by the rotation of the impeller in which a plurality of blades are arranged in a curved shape. The sirocco fan is a centrifugal fan .

The centrifugal fan including such a sirocco fan is used in a ventilator requiring an old-fashioned amount, and a motor and a fan are directly connected to each other and the direction of the introduced air and the direction of the discharged air are approximately 90 °.

A conventional sirocco fan is a bidirectional centrifugal fan that is combined with two centrifugal fans in order to increase the airflow and to be used when the air can be sucked in both left and right directions.

Such a bidirectional centrifugal fan, a sirocco fan, is configured such that air is sucked through both right and left directions in the direction of the motor and then discharged in the direction of the discharge port by means of the blades constituted by the inner circumferential surfaces on both sides, And the air is sucked in one direction and then discharged. This makes it possible to blow air with a higher airflow than a one-way centrifugal fan.

However, such a bidirectional centrifugal fan, the sirocco fan, is formed on both sides of the left and right blades that generate air resistance, so that there is a possibility that noise and vibration are increased due to different air resistance, and the performance of the fan is deteriorated as a whole.

Particularly, when the partition wall plate is formed across the center of the impeller constituting the centrifugal fan and the air is sucked in both directions by the motor driving and then the air is discharged in the direction of one outlet, The amount of inflow air by the motor housing is small and the amount of inflow air is relatively large in the other direction in which the motor is not provided. As a result, noise and vibration are inevitably generated due to the unbalance, .

In addition, since the air sucked into both sides collides with the partition plate first and then is bent in the direction of 90 ° to form a flow path toward the discharge port, noise caused by the impact between the air sucked in both directions and the partition plate, There is a problem that vibration and noise are considerably generated due to unbalanced inflow of the inflow air.

As a method for solving such a problem, a 'bidirectional centrifugal fan' which is a Korean Patent Registration No. 10-1241730 is disclosed, and includes a first blade disposed on one side of a main plate (a partition plate partitioning the blade) And the second blade is disposed on the other side of the main plate so that the main plate is deflected in one direction.

In the case of the prior art, the uneven suction force applied to the bidirectional centrifugal fan is solved and the amount of air blown from both the left and right sides of the centrifugal fan can be uniformly distributed. As a result of the biasing of the main plate in one direction, There is a possibility that the above-described problem can be overcome because a state in which the amount of the air introduced from the air intake port 20 is not biased to any one side can be expected.

However, in this case, since the main plate has the form of the partition plate for partitioning the first and second blades, the air introduced from both sides contacts the both surfaces of the main plate, and friction, impact and resistance And noise can be solved.

Korean Patent Registration No. 10-1241730 (Announced on March 3, 2013)

Therefore, as described above, the present invention can correct the flow rate of the air introduced from both sides of the bidirectional centrifugal fan, thereby eliminating uneven suction resistance and minimizing the noise generated when sucking in air from the outside And an object of the present invention is to provide a centrifugal blower fan impeller structure capable of correcting a blowing flow rate and performing a low noise operation so as to prevent vibration due to noise reduction and thereby improve fan performance.

According to an aspect of the present invention,

An impeller rotatably installed in a center of the centrifugal fan housing and a bi-directional centrifugal fan adapted to be driven by the driving motor inserted into one side of the centrifugal fan housing,

A partition rib which is partitioned into a first blade region and a second blade region at the center of the periphery of the impeller 200,

A plurality of connecting ribs connected to the outer circumferential surface of the bearing housing that surrounds the center bearing from the inside of the partition rib are radially spaced from each other and a mixing air is formed between the connecting ribs so that air introduced from both sides of the centrifugal fan is mixed (Mixed), and is operated in a low noise and low resistance state toward the discharge port side.

According to the present invention, it is possible to remove a conventional baffle plate formed so as to be divided into a first blade region and a second blade region across a center of an impeller applied to a bidirectional centrifugal fan, and to separate the first blade region and the second blade region A mixing rib which is a space separating from the connecting rib and the connecting rib is formed so that the amount of air introduced from both directions is controlled naturally and then discharged through the outlet of the centrifugal fan, By correcting the flow rate of the air flowing in both directions from the bidirectional centrifugal fan, it is possible to solve the uneven suction resistance, to minimize the noise generated when sucking in air from the outside, to prevent the vibration due to noise reduction, So that the performance can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bidirectional centrifugal fan according to an embodiment of the present invention; FIG.
3 is a perspective view of an impeller according to the present invention.
4 is a schematic side view of the impeller according to the present invention.
Figs. 5 to 11 are views showing each embodiment in which the connecting ribs of the impeller adopted in the present invention are formed in different shapes
12 shows an example in which a cover body having the same size as the housing size of the drive motor is constituted by the other blade area opposed to the blade area into which the drive motor is inserted
13 is a schematic view showing an example in which the outer surface of the driving motor fixing plate for fixing the driving motor is subjected to a rounding process so that the flow path of air introduced through the other blade area can be formed in a streamlined manner

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are only for the purpose of illustrating embodiments of the inventive concept, It is intended to include all changes, equivalents, or alternatives falling within the spirit and scope of the present invention, as various changes can be made and have various forms, and terms and words used in the specification and claims are to be understood to be either conventional The inventor of the present invention is not limited to the meaning of the present invention and the inventor can define the concept of the term appropriately in order to explain his invention in the best way. . Therefore, the embodiments described in the specification of the present invention and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. It should be understood that various equivalents and modifications are possible or possible.

Also, unless otherwise defined in the description of the present invention, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs I have. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

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

The present invention relates to a structure of an impeller applied to a bidirectional centrifugal fan such as a sirocco fan.

The bidirectional centrifugal fan 100 has a normal structure as shown in FIGS. 1 and 2, and air is introduced from both sides of the centrifugal fan 100, and air discharged from both sides through the central discharge port 110 is discharged. And the impeller 200 is rotated by the driving of the driving motor 120. As shown in FIG.

The driving motor 120 includes a bending fixing bar 121 and a driving motor fixing plate 122 connected to an end of the bending fixing bar 121 and formed in a vertically- And the shaft of the drive motor 120 is coupled to a bearing in the bearing housing 250 provided at the center of the impeller 200 to be driven by a conventional Structure.

As shown in the drawing, the bending and fixing bar 121 may be formed in any one of a blade area (for example, a first blade area or a second blade area) selected from the inside of the housing of the centrifugal fan 100 And a drive motor fixing plate 122 having a circular plate shape vertically disposed in the blade region is provided at an end of the bending fixing bar 121. The driving motor fixing plate 121 is provided with a driving motor 120 are connected to a bearing 251 provided in the bearing housing 250 of the impeller 200 after passing through the center of the driving motor fixing plate 122.

Here, the driving motor 120 has a conventional structure in which it is fixed to the driving motor fixing plate 122 by fixing means such as a bolt.

As shown in FIG. 3, the impeller 200 adopted in the present invention has an annular shape at an outermost periphery to divide the impeller 200 into a first blade region 210 and a second blade region 220 A partition rib 230 is formed.

The first blade region 210 and the second blade region 220 are formed with a blade B having a shape curved in one direction as shown in the drawing, and the rotation of the impeller 200 So that it is easy to introduce the air and discharge the centrifugal fan (100) to the discharge port (110) side.

The connection ribs 240 are connected to the inside of the partition ribs 230 so that the connection ribs 240 are equally spaced from each other as shown in the drawing and the ends of the connection ribs 240 are connected to bearings 251 And the outer circumferential surface of the bearing housing 250 for covering the outer circumferential surface of the bearing housing 250.

A space is formed between the connecting rib 240 and the connecting rib 240 to form a mixing hole 241 for allowing the first blade region 210 and the second blade region 220 to communicate with each other.

Air mixed in from both sides of the centrifugal fan 100 is mixed by the mixed air 241 and can be operated in a low noise and low resistance state toward the discharge port side.

In other words, the centrifugal fan 100 is divided into a blade region on one side where the drive motor 120 is fixed and a blade region on the other side where the drive motor 120 is not fixed. The air flowing through the side surface of the blade region on one side of the blade 120 is blocked by the housing of the driving motor 120 so as to flow into the side thereof. And it is pointed out as a cause of noise generation.

Also, since the air introduced through the side surface of the blade region where the driving motor 120 is not fixed has a relatively small resistance and there is no element that interferes with the flow path, the air flowing through the side surface of the blade region where the driving motor 120 is fixed The flow rate is relatively low rather than the flow rate and the flow rate of the fluid, resulting in an unbalance in which the flow rate is increased.

Therefore, due to the structural characteristics of the centrifugal fan 100, it is inevitable that noise and vibration are generated due to unbalanced flow rates and flow rates of air flowing through the respective side surfaces of the first blade region 210 and the second blade region 220 In order to solve this unbalance, in the present invention, the aforementioned mixed air (mixed air) 241 is formed.

A high speed and a small amount of fluid (air) and a driving motor 120 which are flowed through one side of the centrifugal fan 100 including the driving motor 120 are provided by the mixer 241 A large amount of fluid (air) flowing through the other side of the centrifugal fan 100 is mixed with each other and canceled each other, so that the fluid velocity and the flow rate are naturally corrected, and then discharged through the discharge port 110 of the centrifugal fan 100 .

Therefore, it is possible to reduce the noise and vibration that can be exerted on the centrifugal fan 100 by mutually canceling each other through the mixing process in which the high-speed, small-volume inflow air in the mixed air (241) is mixed with the low- .

In order to maximize the effect of the present invention, the cross-sectional shape of the connecting rib 240 may be variously changed.

For example, as shown in FIG. 4, the cross-sectional shape of the connecting rib 240 may have a rectangular shape. When the cross-sectional shape of the connecting rib 240 is shaped like this, .

In order to avoid such a phenomenon, it is possible to propose a connecting rib 240 as shown in Figs. 5 to 11.

For example, as shown in FIG. 5, a tapered surface 242 may be formed at an end portion of the side end of the connecting rib 240 that is in contact with the inflow fluid (air). The fluid flowing through both ends of the tapered surface 242 forms a flow path along the tapered surface 242 and flows into the connecting rib 240 The resistance coefficient of the flowing fluid is canceled to thereby eliminate the stagnation of the flow path due to the collision between the fluids, thereby minimizing noise generation.

5, both of the front and rear surfaces of both side ends of the connecting rib 240 may have a tapered surface 242. [ When the tapered surface 242 is provided on both the front and rear surfaces, the air introduced from the outside is caused to flow inward from the tapered surface 242 of the rear surface after the resistance of the end tapered surface 242 decreases .

That is, since the inside of the tapered surface 242 on the rear surface forms a region having a relatively low air density, the flow of the fluid forms a flow path to be turned inward rather than diffusing outwardly as shown in FIG. 5, The collision phenomenon between the flow path and the flow path without direct contact with the surface is reduced, so that a phenomenon such as noise due to the flow path collision of the inflow air can be reduced.

7, the end portion of the side wall of the connection rib 240, which is in contact with the inflow fluid, may have a curved surface 243, And the curved surface 243 may be formed on both the front and rear surfaces.

7 to 8, when the curved surface 243 is formed on the front surface or the rear surface of the side end portion of the connecting rib 240, the curved surface 243 is more likely to flow than the tapered surface 242 shown in FIGS. The flow path of air can be formed in a streamlined shape and can flow into the mixing hole 241 side, so that the generation of noise can be remarkably reduced.

Alternatively, as shown in FIGS. 9 to 10, a long curved surface 244 may be formed from one side of the front surface forming the width of the connecting rib 240, or a long curved surface 244 may be formed on the front side and the rear side, The curved surface 244 can be formed.

When the long curved surface 244 is formed from one side to the other side over the entire width of the connecting rib 240, the inflow air has a flow path that is gradually deformed in a streamline shape, thereby suppressing noise generation due to the resistance value offset .

As shown in FIG. 9, when a long curved surface 244 is formed facing the other side from the front and rear surfaces forming the width of the connecting ribs 240, 240, .

On the other hand, FIG. 11 shows an example in which the connecting rib 240 is formed in a circular shape, and the connecting rib 240 has a round bar shape, and the air introduced into the centrifugal fan 100 and the connecting rib 240 The noise and vibration phenomenon of the air flowing through the impeller 200 of the centrifugal fan 100 can be suppressed.

In the above embodiments, the noise reduction structure according to the change in the shape of the width, that is, the area that is in contact with the connection rib 240 for a period of time, has been described. However, the drive motor 120 is fixed to the bending fixed bar 121, and the outer surface of the driving motor fixing plate 122 having a vertically upper shape is subjected to a rounding treatment so that the frictional resistance of the air introduced from the other blade area opposed to the blade area provided with the driving motor 120 So that the airflow can be guided in a streamlined manner.

12, in the case where the blade area into which the driving motor 120 is inserted is the first blade area 210, the second blade area 220 corresponding to the first blade area 210 may also include a driving motor The cover body 260 having the same size as the housing of the cover 120 can be engaged and fixed.

The reason for this is that the flow passage area of the air flowing through the first blade area 210 provided with the drive motor 120 and the flow passage area of the air flowing through the second blade area 220 corresponding thereto So that the flow velocity and the flow rate of the air flowing through both blade regions are made uniform.

The means for fixing the cover body 260 can be fixed by boring the same structure as the bending fixing bar 121 and the driving motor fixing plate 122 for fixing the driving motor 120 described above.

With this arrangement, the flow rate and the flow velocity of the air flowing through the blade region constituting the region into which the drive motor 120 is inserted and the flow rate of the air flowing through the blade region constituting the region in which the drive motor 120 is not inserted Even when a difference in flow rate and flow rate occurs between the centrifugal fan 100 and the centrifugal fan 100 when the air is discharged toward the discharge port 110 of the centrifugal fan 100 in anticipation of the correction of the air flow rate and the effect of mutual cancellation of the flow rate, 100) can completely eliminate the vibration and noise due to the unbalance of the inflow air, and can secure the reliability of the product.

While the present invention has been described with reference to the particular embodiments and drawings, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and changes may be made.

Accordingly, it is to be understood that the technical idea of the present invention is to be understood by the following claims, and all of its equivalents or equivalents fall within the technical scope of the present invention.

100; A centrifugal fan 110; outlet
120; A driving motor 121; Bending fixing bar
200; Impeller 210; The first blade area
220; A second blade area 230; Partition rib
240; A connecting rib 241; Mixed chemical
242; Tapered surface 243; Curved surface
244; Long curved surface 250; Bearing housing
251; bearing

Claims (7)

The centrifugal fan (100) includes a first blade region (210) and a second blade region (220), which are annularly formed at the periphery of the periphery of the impeller (200) And a drive motor 120 is fitted to one side of the housing of the centrifugal fan 100 to drive the impeller 200. In the impeller structure,
A plurality of connecting ribs 240 connected to the outer circumferential surface of the bearing housing 250 surrounding the inner central bearing 251 of the impeller 200 from the partition rib 230 are radially spaced apart from each other, (Blended empty) 241 is formed between the first and second substrates 240,
The driving motor 120 is connected to an end of the bending and fixing bar 121 which is fixed inside the blade area and rounds the outer surface of the driving motor fixing plate 122, So that the flow of air introduced through the other blade region opposed to the blade region to be guided is guided in a streamlined manner,
So that the air introduced from both sides of the centrifugal fan (100) is mixed in the mixing hole (241) and operated in a low noise and low resistance state toward the discharge port (110) Impeller structure of the centrifugal blower fan possible. The method according to claim 1,
A tapered surface 242 may be formed at the width side end portion of the front surface that is in contact with the inflow fluid of the side end portions forming the width of the connection rib 240, And a tapered surface (242) is formed on the outer peripheral surface of the impeller structure of the centrifugal type blower fan.
The method according to claim 1,
A width side end portion of the front surface which is in contact with the incoming air among the side end portions of the connecting rib 240 may have a curved surface 243 or a curved surface 243 may be provided on the front and rear surfaces of both ends of the width of the connecting rib 240 ) Of the centrifugal blower fan, which is capable of performing a blowing flow rate correction and a low noise operation.
The method according to claim 1,
A long curved surface 244 extending from one side of the front surface forming the width of the connecting rib 240 to the other side or a long curved surface 244 corresponding to the front surface and the rear surface may be formed. Wherein the impeller structure of the centrifugal blower fan capable of correcting the blowing flow rate and performing low noise operation is provided.
The method according to claim 1,
The impeller structure of the centrifugal blower fan capable of correcting the blowing flow rate and performing low noise operation, wherein the connecting rib (240) is formed in a circular shape.
delete The method according to claim 1,
A cover member 260 having the same size as the housing of the drive motor 120 is coupled and fixed to the other blade area corresponding to the blade area in which the drive motor 120 is inserted, 210, and the second blade region 220) of the blower fan, the air flow rate correction and the low-noise operation of the centrifugal blower fan.

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