KR20140125522A - turbo fan - Google Patents

Abstract

A turbo fan according to the present invention comprises a main plate rotating by a fan motor providing power; and a plurality of blades having one ends connected to the main plate and arranged along a circumference direction on the main plate, wherein a separation delay part, including a first curved part curved in one direction from an extended part and a second curved part in the other direction from the extended part, is formed at one ends of the blades, and a plurality of protrusions protruding in one direction from one sides of the blades and a plurality of recesses protruding in the other direction are alternately arranged in the first curved part and the second curved part.

Description

Turbo fan {turbo fan}

The present invention relates to a turbo fan.

Background Art [0002] Generally, a ceiling-type air conditioner is a device that is embedded in an indoor ceiling to introduce indoor air and then heat-exchanged air is discharged from the ceiling to the room. In the ceiling-type air conditioner, air is sucked through a suction port disposed at the center, and the sucked air can be air-conditioned by a heat exchanger disposed inside the ceiling-type air conditioner. The air-conditioned air can be discharged to the room through the discharge part disposed at the rim of the ceiling-type air conditioner to adjust the temperature and humidity of the indoor space.

As disclosed in the publication No. 10-2008-0054153 (entitled " turbo fan and air conditioner equipped therewith "), the air sucked through the suction port is sucked by a turbo fan disposed inside the ceiling type air conditioner Its movement can be guided. That is, the turbo fan can discharge air in the radial direction of the turbo fan by introducing air from the axial direction with reference to the turbo fan.

1 is a perspective view of a turbo fan according to the prior art.

Referring to FIG. 1, a turbo fan 1 according to the related art includes a main plate 10 rotated by the power provided by a motor, a main plate 10 arranged radially to the main plate 10, And a shroud 30 that is coupled to an end of the blade 20 so as to face one surface of the main plate 10.

The turbo fan 1 includes a hub 11 accommodating the motor therein, a boss 12 provided at a central portion of the hub 11 to have a shaft hole for shaft coupling with the motor, (13) disposed on the surface of the hub (11) and configured to cool the motor. The passage (13) can lower the temperature of the motor by allowing cold air to flow into the motor.

The air sucked into the turbo fan 1 through the suction port 33 may be discharged to the outside of the turbo fan 1 through the discharge port 34. The discharge port (34) may be defined as a space formed between the plurality of blades (20).

When the blade 20 rotates in the counterclockwise direction with reference to FIG. 1, air moving along the rear surface of the blade can be discharged to the outside through the discharge port 34. However, the air moving along the blade 20 may be separated from the surface of the blade 20. The peeling phenomenon caused noise generation when the turbo fan 1 was operated.

Also, in recent years, air volume required by the air conditioning system has been increasing more and more as the capacity of the air conditioning system is increased. The flow noise of the air passing through the turbo fan 1 also increases with the increase of the air volume of the air conditioning system. As a result, there is a problem that the noise generated in the turbo fan 1 inconveniences a user.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a turbo fan for reducing air flow noise generated in operation of a turbo fan.

A turbo fan according to the present invention includes: a main plate rotated by a fan motor that provides power; And a plurality of blades having one end connected to the main plate and disposed along the circumferential direction on the main plate, wherein one end of the blade has a first curved portion bent in one direction with respect to the extended portion, And a plurality of protrusions protruding in one direction from one side of the blade and a plurality of protrusions protruding in the other direction are formed in the first valley portion and the second valley portion, Are alternately arranged.

According to the present invention, a plurality of protrusions and grooves are alternately disposed at the rear end of the blade, so that the flow noise of the air moving along the surface of the blade can be reduced.

Further, the separation delay unit including the plurality of protrusions and the plurality of grooves is formed at the rear end of the blade, thereby delaying the flow separation of air generated at the rear end of the turbine during operation of the turbofan.

1 is a perspective view of a turbo fan according to the prior art;
2 is a perspective view of an indoor unit of a ceiling-type air conditioner according to the present invention.
3 is a sectional view of an indoor unit of a ceiling-type air conditioner according to the present invention.
4 is a perspective view of a blade according to the present invention.
5 is a front view of a blade according to the present invention.
6 is a view showing various configurations of the delamination delay section according to the present invention;
7 is a view showing a correlation between air volume and noise when a blade according to the present invention is applied to a ceiling type air conditioner.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. 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 embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

FIG. 2 is a perspective view of an indoor unit of a ceiling-type air conditioner according to the present invention, and FIG. 3 is a sectional view of an indoor unit of a ceiling-type air conditioner according to the present invention.

2 and 3, a ceiling-type air conditioner according to the present invention includes an outdoor unit (not shown) installed in an outdoor space, an indoor unit 100 installed in an indoor space, and an outdoor unit (not shown) And a refrigerant pipe (not shown) in which the refrigerant is moved.

The indoor unit 100 includes a case 105 forming an outer appearance, a turbo fan 200 provided inside the case 105, a fan motor 120 coupled to the turbo fan 200 and providing power, And a heat exchanger (130) provided outside the fan motor (120).

The case 105 may include a main body 101 forming a side surface and a front panel 102 coupled to the main body 101 and forming a front surface.

The main body 101 is installed on the ceiling of the room and can be opened to communicate with the suction port 150 formed on the front surface of the front panel 102. The main body 101 is preferably installed on the ceiling in consideration of space utilization or aesthetics, but the installation space of the main body 101 is not limited thereto. For example, the main body 101 may be installed on the side wall of the room.

The front panel 102 may be detachably coupled to the lower portion of the main body 101. The front panel 102 may be disposed to be exposed to the room so as to suck or discharge air into the indoor unit 100. The front panel 102 may cover an open portion of the main body 101. For example, the front panel 102 may have a rectangular plate shape to cover the opening of the main body 101. In addition, the front panel 102 may include a suction port 150 for sucking room air and a discharge port 140 for discharging air to the room.

The suction port 150 may be disposed at a central portion of the front panel 102. The discharge ports 140 may be formed to be symmetrical to the outer sides of the suction port 150. The suction port 150 may be formed in a grill structure, and the discharge port 140 may have a rectangular shape having a predetermined width and length. However, the shapes of the suction port 150 and the discharge port 140 are not limited thereto.

A filter 190 may be provided on the inside of the front panel 102 to remove various foreign substances contained in the air sucked into the main body 101 through the suction port 150.

The turbo fan 200 includes a hub 112 connected to the rotation axis of the fan motor 120, a main plate 115 rotated by the fan motor 120, one end connected to the main plate 115, A plurality of blades 400 disposed at predetermined intervals along the circumferential direction on the main plate 115 and a shroud 300 disposed opposite to the main plate 115 and connecting the other ends of the plurality of blades 400 . The shroud 300 may guide the inflow of air into the inlet 150 when the turbo fan 200 rotates.

The turbo fan 200 may be installed at a position corresponding to the suction port 150 to improve suction efficiency of the air sucked into the main body 101. 3, the turbo fan 200 may be vertically installed to correspond to the inlet 150. Referring to FIG.

The turbo fan 200 blows the indoor air sucked through the suction port 150 to the heat exchanger 130.

The heat exchanger 130 may surround the outside of the turbo fan 200. For example, the heat exchanger 130 may have a rectangular shape corresponding to the side surface shape of the main body 101. The heat exchanger 130 may perform heat exchange of the air sucked into the main body 101 through the turbo fan 200. Specifically, during the cooling operation of the ceiling-type air conditioner, the temperature of the air passing through the heat exchanger 130 is lowered, and during the heating operation of the ceiling-type air conditioner, the temperature of the air passing through the heat exchanger 130 Can be increased.

A drain plate 131 may be disposed below the heat exchanger 130 to receive condensed water generated during a heat exchange process between the refrigerant passing through the heat exchanger 130 and the room air. A drain pipe (not shown) for discharging the condensed water collected in the drain plate 131 to the outside may be connected to the drain plate 131.

A guide passage 180 for guiding the moving direction of the air may be formed in the inner periphery of the main body 101. Specifically, the guide passage 180 may guide the air heat-exchanged by the heat exchanger 130 to the discharge port 140.

The discharge port 140 may be provided with a vane 141 for controlling the moving direction of the air. The vane 141 may be configured to be rotatable at a predetermined angle. In addition, the vane 141 may be inclined outward from the front surface of the front panel 102. This is to provide a wind having a uniform wind velocity in all parts of the room. However, the direction of rotation of the vane 141 is not limited thereto. Also, the arrangement, construction, and operation of the vane 141 are not limited thereto.

In operation of the turbo fan 200, air introduced into the turbo fan 200 may be discharged to the outside through a space formed between the plurality of blades 400. That is, the air can be moved along the surfaces of the plurality of blades 400. However, the air that moves along the blade 400 may be separated from the surface of the blade 400. The peeling phenomenon may cause noise generated when the turbo fan 200 is operated. Accordingly, in the blade 400 according to the present invention, the protrusion 530 may be formed at the rear end of the blade 400.

Hereinafter, the detailed structure of the blade 400 will be described.

4 is a perspective view of a blade according to the present invention.

4, the blade 400 according to the present invention may include a blade front end 410 disposed adjacent to the hub 112 and a blade rear end 420 disposed spaced apart from the hub 112 have. Therefore, the air introduced into the turbo fan 200 along the suction port 150 can be moved from the blade front end 410 toward the rear end 420 of the blade. Also, the air introduced into the turbo fan 200 can be moved along the surface of the blade 400.

At the rear end 420 of the blade, a plurality of curved portions may be formed. The plurality of curved portions may include a first curved portion 421 bent in one direction with respect to the extended portion 500 and a second curved portion 422 bent in the other direction with respect to the extended portion 500 have. The extension 500 may be defined as an imaginary line formed when the blade extends straight from the upper end of the blade rear end 420 to the lower end of the blade rear end 420.

Specifically, a point where the main plate 115 meets the blade rear end 420 is referred to as a first contact point 450, and a point at which the shroud 300 and the blade rear end 420 meet is referred to as a second contact point 460 The extended portion 500 may be defined as an imaginary line formed when the first contact 450 and the second contact 460 are linearly extended.

The first curved portion 421 and the second curved portion 422 may be curved surfaces having a predetermined curvature. For example, the first curved portion 421 may protrude leftward with respect to the extending portion 500. The second curved portion 422 may protrude rightward with respect to the extended portion 500. However, the protruding directions of the first curved portion 421 and the second curved portion 422 are not limited thereto. Illustratively, the first curved portion 421 protrudes in the right direction with respect to the extending portion 500, and the second curved portion 422 protrudes in the left direction with respect to the extending portion 500 It is possible.

The blade 400 according to the present invention may further include an intersection portion 425 defined as a point where the extension portion 500 meets the blade rear end 420. The intersection 425 may be defined as a boundary point between the first curved portion 421 and the second curved portion 422. 4, the first curved portion 421 may be disposed upward with respect to the intersecting portion 425, and the second curved portion 422 may be disposed with respect to the intersecting portion 425, As shown in Fig.

The length of the first curved portion 421 and the length of the second curved portion 422 may be equal to each other. That is, the intersection 425 may be disposed at a central point of the extension 500. However, the length of the first curved portion 421 and the length of the second curved portion 422 are not limited thereto.

A first fluid part 502 may be formed in a space between the first curved part 421 and the extended part 500. Similarly, a second fluid portion 504 may be formed in a space between the second curved portion 422 and the extended portion 500. The first fluid unit 502 and the second fluid unit 504 may guide the moving direction of air moving from the blade front end 410 to the blade rear end 420. Accordingly, it is possible to delay the flow separation of the air generated at the blade rear end 420 side.

A plurality of protrusions 423 projecting in one direction from the blade rear end 420 and a plurality of grooves 424 protruding in the other direction from the blade rear end 420 may be formed in the blade rear end 420 .

The plurality of protrusions 423 and the plurality of grooves 424 may be formed in a direction perpendicular to the protruding direction of the curved portion 421. That is, the plurality of projections 423 and the plurality of grooves 424 may protrude from the blade front end 410 toward the rear end 420 of the blade.

Hereinafter, the detailed configuration of the blade rear end 420 will be described.

5 is a front view of a blade according to the present invention.

Referring to FIG. 5, the blade rear end 420 is formed with a separation delay unit 600 capable of delaying separation of air moving along the surface of the blade 400 from the surface of the blade 400 . The separation delayer 600 may be defined as a space formed between a surface connecting a plurality of protrusions 423 formed on the blade and a surface connecting a plurality of grooves 424 formed on the blade .

The outer surface 510 and the inner surface 520 are connected to the plurality of protrusions 423 and the inner surface 520 is a surface connected to the plurality of grooves 424, And may be formed in a curved shape having a predetermined curvature.

The outer circumferential surface 510 and the inner circumferential surface 520 may be disposed parallel to each other. That is, the curvature formed by the outer circumferential surface 510 and the curvature formed by the inner circumferential surface 520 may be equal to each other. Therefore, it is possible to delay both the flow of air passing through the upper end of the blade 400 and the flow separation of air passing through the lower end of the blade 400.

The width L of the separation delay unit 600 formed at the upper end of the blade 400 is equal to the width L 'of the separation delay unit 600 formed at the lower end of the blade 400 . That is, the vertical distance between the protrusion 423 and the groove 424 may have a constant value.

The peeling delay unit 600 includes a protrusion 530 protruding from the inner circumferential surface 520 toward the outer circumferential surface 510 with respect to the blade rear end 420 and a protrusion 530 disposed between the protrusions 530, And a hollow portion 540 defined by a space. The protrusion 530 may constitute a part of the surface of the blade 400. In other words, the protrusion 530 may be defined as a portion of the surface of the blade 400 formed between the outer circumferential surface 510 and the inner circumferential surface 520. The protrusion 530 and the hollow portion 540 may be alternately arranged.

In the hollow portion 540, a vortex may be generated. Accordingly, the air, which is moved from the blade front end 410 to the blade rear end 420, is guided to move in the direction of the protrusion 530 by the vortex so that the flow separation of air generated in the blade rear end 420 The phenomenon can be delayed.

6 is a view showing various configurations of the peel-off delay unit according to the present invention.

Referring first to FIG. 6A, the shape of the blade rear end 420 may have a predetermined curvature. In addition, the separation delayer 600 according to the present embodiment may include a plurality of protrusions 423 and a plurality of grooves 424. The plurality of protrusions 423 may include a first protrusion and a second protrusion disposed adjacent to the first protrusion. When the distance between the first projection and the second projection is A and the length of the blade rear end 420 is B, the value of A / B may be a value between 0.05 and 0.15. However, the ratio between the distance between the first projection and the second projection and the length of the rear end of the blade 420 is not limited thereto.

When the height of the projection 423 is C with respect to the inner circumferential surface 520 and the vertical distance from the blade front end 410 to the blade rear end 420 is D, the value of C / D is 0.06 and 0.20 Lt; / RTI > However, the ratio between the height of the projection 423 and the vertical distance from the blade front end 410 to the blade rear end 420 is not limited thereto.

However, the shape of the blade rear end 420 is not limited to a curved shape having a predetermined curvature.

Referring to FIG. 6B, the protrusion 623 may have a tip shape having one end with a taper. Similarly, the groove 624 may be configured to have the tip portion shape. As another example, the protrusion 423 may be formed in a curved shape having a predetermined curvature, and the groove 624 may have a tip shape.

FIG. 7 is a graph showing a correlation between air volume and noise when a blade according to the present invention is applied to a ceiling-type air conditioner.

Referring to FIG. 7, when the ceiling-type air conditioner to which the conventional blades are applied operates, the relationship between air volume and noise may have the relationship of N disclosed in FIG. When the ceiling type air conditioner to which the blade according to the present invention is applied operates, the relationship between the air flow rate and the noise may have the relationship of M disclosed in FIG.

That is, if the air volume of the air discharged from the ceiling-type air conditioner is the same, the noise generated during operation of the ceiling-type air conditioner to which the blade according to the present invention is applied, May be less than the noise generated.

That is, in the blade 400 according to the present invention, a plurality of curved portions 421 and 422 are formed at the rear end 420 of the blade, and the curved portions 421 and 422 are provided with separation delays (600) may be formed. Specifically, a plurality of protrusions 423 and a plurality of grooves 424 may be formed in the plurality of curved portions 421 and 422 to delay the flow separation of air generated in the blade rear end 420.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

100: indoor unit 200: turbo fan
400: blade 410: blade shear
420: blade rear end 421: first valley
422: second curved portion 423: projection
424: groove 500: extension part
510: outer circumferential surface 520: inner circumferential surface
530: protruding portion 540: hollow portion
600: peeling delay part

Claims (12)

An abacus rotated by a fan motor providing power; And
A plurality of blades, one end of which is connected to the main plate and is arranged on the main plate in the circumferential direction,
At one end of the blade,
A peel-off delay portion including a first valley portion bent in one direction with respect to the extended portion and a second valley portion bent in the other direction with respect to the extended portion is formed,
In the first curved portion and the second curved portion,
A plurality of projections projecting in one direction from one side of the blade and a plurality of grooves projecting in the other direction are alternately arranged. The method according to claim 1,
The extension
And a virtual line formed when the one lower end of the blade is linearly extended from the upper side of the blade. 3. The method of claim 2,
Wherein the first curved portion and the second curved portion are respectively provided with a first fluid portion and a second fluid portion that provide a path for air movement,
Wherein the first flow portion is defined as a space between the first curved portion and the extended portion,
And the second flow portion is defined as a space between the second valley portion and the extension portion. The method according to claim 1,
An outer circumferential surface which is a virtual line connecting the plurality of projections; And
Further comprising an inner circumferential surface which is a virtual line connecting the plurality of grooves,
Wherein the outer circumferential surface and the inner circumferential surface are disposed parallel to each other. 5. The method of claim 4,
Wherein a curvature formed by the outer circumferential surface and a curvature formed by the inner circumferential surface are equal to each other. 5. The method of claim 4,
Wherein the vertical distance between the outer circumferential surface and the inner circumferential surface is constant. 5. The method of claim 4,
The peeling-
A protrusion which constitutes a part of one surface of the blade protruding from the inner circumferential surface to the outer circumferential surface; And
And a hollow portion disposed between the projecting portions,
Wherein the projecting portion and the hollow portion are alternately arranged. The method according to claim 1,
Further comprising a rotation axis for providing a rotation center of the main plate,
The blade
A blade front end positioned adjacent to the rotation axis; And
And a blade rear end positioned so as to be spaced apart from the rotation shaft,
Wherein the plurality of projections and the plurality of grooves are formed by a plurality of projections,
And a turbofan disposed at a rear end of the blade. 9. The method of claim 8,
Wherein the plurality of projections and the plurality of grooves are formed by a plurality of projections,
And is formed in a direction from the front end of the blade toward the rear end of the blade. 10. The method of claim 9,
Wherein the plurality of curved portions comprise:
And protrudes in a direction perpendicular to the projecting direction of the plurality of projections. 11. The method of claim 10,
Wherein the plurality of projections and the plurality of grooves are formed by a plurality of projections,
Wherein the turbo fan has a predetermined curvature. 11. The method of claim 10,
Wherein the plurality of projections and the plurality of grooves are formed by a plurality of projections,
Wherein the turbine comprises a tip portion.

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