[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

KR20170102097A - Fan of axial flow suppress for vortex and leakage flow - Google Patents

Fan of axial flow suppress for vortex and leakage flow Download PDF

Info

Publication number
KR20170102097A
KR20170102097A KR1020160024138A KR20160024138A KR20170102097A KR 20170102097 A KR20170102097 A KR 20170102097A KR 1020160024138 A KR1020160024138 A KR 1020160024138A KR 20160024138 A KR20160024138 A KR 20160024138A KR 20170102097 A KR20170102097 A KR 20170102097A
Authority
KR
South Korea
Prior art keywords
fan
pressure surface
vortex
flow
negative pressure
Prior art date
Application number
KR1020160024138A
Other languages
Korean (ko)
Inventor
곽상기
Original Assignee
주식회사 엠티에스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 엠티에스 filed Critical 주식회사 엠티에스
Priority to KR1020160024138A priority Critical patent/KR20170102097A/en
Publication of KR20170102097A publication Critical patent/KR20170102097A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
    • F24F1/0029—Axial fans

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention relates to an axial flow fan suppressing a leakage flow and a vortex, which suppresses generation of a leakage flow and a vortex by forming a protruding portion at a front margin side of a wing of the fan, and improves air flow efficiency through a bent portion of an outer circumference. More specifically, an axial flow fan coupled to a rotating axis to rotate comprises: a plurality of protruding portions formed on a negative pressure surface of a front margin of each wing of the fan composed of a plurality of wings; a bent portion formed to be bent along an outer circumference of the wings, wherein a dead end is formed at a pressure surface side of the wings; and a curved line portion protruding at a predetermined width in an external side direction at regular intervals toward a hub in which the wings are fixated in a dead end of an outer circumference of the bent portion. Therefore, air flowing in the front margin suppresses generation of a leakage flow generated on a negative pressure surface of the wings by rotation of the wings through the protruding portions, and a vortex of the air flowing through the bend portion formed in a rear margin is reduced.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an axial flow fan for axial flow,

More particularly, the present invention relates to an axial flow fan for suppressing flow and vortex, and more particularly, to a fan for reducing flow and noise generated during fan rotation, And to an axial flow fan for suppressing turbulence and vortex.

Generally, an axial flow fan such as a propeller fan is used as a blower of an outdoor unit for an air conditioner.

When the propeller fan is used in an outdoor unit, it is connected to a fan motor drive shaft of the outdoor unit and has a hub serving as a rotation center of the propeller fan and a plurality of blades integrally formed on the outer circumferential surface of the hub .

In the case of the outdoor unit unit having such a structure, in addition to the noise from the propeller fan unit, there is a problem that noise caused by collision of the blowout airflow from the propeller fan with the downstream structure such as the fan guard is generated, .

Thus, in order to reduce all the noise when the axial flow fan such as the propeller fan is adopted as the blower of the outdoor unit for the air conditioner, up to now, for example, optimization of the shape of the wing surface of the propeller fan blade And airfoil blades having excellent aerodynamic performance have been carried out. However, the following problems could not be solved by such a method of generating a sound.

That is, when the blades of the propeller fan are rotated, an air flow is generated from the outer peripheral side of the blades toward the negative pressure surface side where the pressure is low from the pressure side with high pressure, The same tip end vortex is formed.

The disturbance of the discharge airflow due to the tip vortex caused by the airflow flowing from the discharge side to the suction side in the vicinity of the outer circumferential portion of such blades is gradually increased and gradually increases toward the downstream side and eventually grows away from the negative pressure surface of the blade There is a problem that the noise is further increased by interfering with the pressure surface of the adjacent blades, the inner circumferential surface of the bell mouth, or the fan guard which is the structure on the downstream side of the blower.

In order to solve this problem, the prior art patent discloses an axial flow fan having a bell mouth and curving the outer periphery of the blade toward the negative pressure surface side. In the region near the trailing edge of the curved portion as the negative pressure surface, And a second curved portion curved toward the second curved portion.

However, there is still a problem that noise problems and the flow efficiency of the air flowing to the rear side of the fan are reduced.

Prior Patent: Korean Patent Registration No. 10-0921661 (October 07, 2009)

It is an object of the present invention to provide an axial flow fan for suppressing turbulence and eddy currents, which prevents turbulence and vortex from occurring by forming protrusions on the leading edge side of the fan, and increases the air flow efficiency through the bend of the outer periphery.

According to an aspect of the present invention, there is provided an axial flow fan for suppressing flow and vortex flow in an axial flow fan coupled to a rotary shaft, the fan having a plurality of blades, A plurality of protrusions formed on the pressing surface; A bending portion formed to be bent along the outer periphery of the wing and having an end formed on the pressure surface side of the wing and a hub portion on the outer peripheral end of the bending portion on which the wing is fixed, The air flowing in the front edge including the protruding curved portion suppresses the leakage flow generated on the negative pressure surface of the blade due to the rotation of the blade through the protrusion, (Vortex) of the air flowing through the curved portion formed in the outer circumferential surface (outer circumferential surface).

And the protruding portion gradually increases in size from the hub side to the outer circumferential side.

The protruding portion is formed in a triangular shape on the side from the leading edge to the trailing edge and is formed as a gentle slope from the leading edge to the protruding point of the triangular protruding portion on the side surface and is formed as a steep slope from the protruding point to the trailing edge side.

The present invention proposes a protrusion on the negative pressure surface of the wing to suppress the occurrence of the leakage flow formed along the negative pressure surface, thereby reducing the noise generated during the fan rotation and suppressing the generation of the squeeze, There is an effect that can be suppressed.

Further, since the air flowing to the rear side of the fan is collected and discharged through the bent surface formed on the outer periphery of the blade, the blowing efficiency can be increased.

FIG. 1 is a perspective view showing the entire configuration of an axial flow fan for suppressing flow and eddy current according to an embodiment of the present invention. FIG.
2 is a rear perspective view of an axial flow fan for suppressing turbulence and eddy current according to the present invention.
3 is a plan view of an axial flow fan for suppressing turbulence and eddy current according to the present invention.
4 is a side view of an axial flow fan for suppressing turbulence and eddy current according to the present invention.
5 is a partial side sectional view showing protrusions of the axial flow fan for suppressing turbulence and eddy current according to the present invention.
6 is a cross-sectional view of an axial flow fan for suppressing turbulence and eddy current according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. And shall not interpret it.

FIG. 1 is a perspective view showing an overall configuration of an axial flow fan for suppressing flow of a flow of nodules and vortices according to an embodiment of the present invention. FIG. 1 is a cross- A curved portion 26 curved outward at a predetermined distance from the curved portion 26 of the outer periphery 24 and a curved portion 26 adjacent to the curved portion 26 of the outer periphery 24, (25).

The fan includes a hub 10 coupled to a rotary shaft and rotated through a rotational force of a rotary shaft and a plurality of blades 20 coupled to an outer circumference 24 of the hub 10.

The blade 20 has a front edge 21 at one side and a trailing edge 22 at the other side which are formed in a direction in which the hub 10 is rotated. And a negative pressure surface 27 formed on the opposite side of the pressure surface 28. The pressure surface 28 is formed on the opposite side of the pressure surface 28, And an outer circumference 24 formed on the outer surface of the negative pressure surface 27. [

The wing 20 is formed by an inward curve of the leading edge 21 and the trailing edge 22 becoming gradually narrow toward the hub 10 side from the outer circumference 24 side and the outer periphery 24 is curvedly projected outward .

The vane 20 is rotated through the rotation of the hub 10 to flow air backward and at this time a flow is generated in the negative pressure surface 27 of the vane 20, (vortex) due to leakage flow.

On the side of the leading edge 21 of the negative pressure surface 27 of each of the vanes 20, a plurality of protrusions 23 are spaced apart from each other by a predetermined distance from the leading edge 21.

The protruding portion 23 is formed to be gradually larger in size from the hub 10 side to the outer circumferential side 24 and is formed in a triangular shape on the side surface and has a gentle slope to a protruding point protruding from the leading edge 21, To the negative pressure surface (27) on the trailing edge (22) side in the form of an isosceles triangle.

The reason why the protrusions 23 are not formed continuously and are formed at a predetermined distance apart is that air resistance is generated when the protrusions 23 are continuously formed to prevent the vanes 20 from rotating, The speed is lowered and the rotary shaft or the like connected to the blade 20, the hub 10 or the hub 10 may be damaged or the durability may be lowered due to the applied pressure.

The projecting portion 23 suppresses the occurrence of the flow of the air by changing the direction of the flow of the air generated in the negative pressure surface 27 when the air flows through the blades 20 when the fan is rotated.

This principle of suppressing the generation of the nudge is suppressed because the air that is cracked at the leading edge 21 flows along the negative pressure surface 27 when the vane 20 is rotated and the air that is cracked due to the leading edge 21 flows due to the thickness of the leading edge 21 And flows along the negative pressure surface 27 at an angle.

As a result, the angle of bending of the air gradually increases, and an air layer is formed on the negative pressure surface 27, so that a flow of the air flows along the negative pressure surface 27.

At the downstream edge 22, a vortex is generated due to the gap between the flow of the air and the downstream flow 22, and the air and the vortex bump against the wall surface, The air flow efficiency of the fan is lowered.

This phenomenon can be prevented by preventing the protrusion 23 protruding from the negative pressure surface 27 from forming an air layer formed on the negative pressure surface 27 by eliminating the gap between the air and the negative pressure surface 27, .

This prevents the generation of the vapors, thereby preventing the generation of the vapors generated due to the space between the downstream flow 22 and the downstream flow.

A curved bent portion 26 is formed on the outer periphery 24 of the vane 20 so as to be perpendicular to the pressure surface 28 side.

The bent portion 26 is formed to increase the discharge efficiency of air because the air flow flowing along the pressure surface 28 is collected and discharged to the rear side of the pressure surface 28 of the fan.

A curved portion 25 is formed at a contact portion between the trailing edge 22 and the outer periphery 24 and formed as a curved line protruding outward at a predetermined interval.

The curved portion 25 may be partially generated by the length of the side of the negative pressure surface 27 on the outer circumference 24. In order to prevent the generation of vortexes that may occur between the flow and the runout 22, Thereby forming a curved portion 25 of a curved shape.

The reason for preventing the curved portion 25 from vortexing is that when the trailing edge 22 is curved inwardly, a vortex is generated due to the air layer formed between the flow of the airflow and the trailing edge 22. Due to the protrusion of the curved portion 25 The flow of air is changed at the end portion of the air layer between the nugget and the trailing edge 22, thereby suppressing vortex generation.

According to the present invention configured as described above, the protrusions are formed on the negative pressure surface of the vane, thereby suppressing the occurrence of the leakage flow formed along the negative pressure surface, thereby reducing the noise generated during fan rotation and suppressing the occurrence of squeeze. There is an effect that the occurrence of vortex can be suppressed.

Further, since the air flowing to the rear side of the fan is collected and discharged through the bent surface formed on the outer periphery of the blade, the blowing efficiency can be increased.

The above-described axial flow fan for suppressing turbulence and vortex is not limited to the configuration and the operation manner of the embodiments described above. The above embodiments may be configured so that all or some of the embodiments may be selectively combined to make various modifications.

10: Hub
20: wing 21: leading edge
22: trailing edge 23: protrusion
24: Outer circumference 25: Curved portion
26: flexion 27: negative pressure face
28: Pressure side

Claims (3)

An axial fan coupled to a rotary shaft and rotated,
A plurality of protrusions formed on the negative pressure surface of each blade leading edge of the fan composed of a plurality of blades;
A bent portion formed to be bent along an outer periphery of the wing and having an end formed on the pressure surface side of the wing,
And a curved portion protruding from the outer circumferential end of the bent portion to a hub side to which the blade is fixed,
Characterized in that the air flowing in the leading edge suppresses the occurrence of the leakage flow generated on the negative pressure side of the blade due to the rotation of the blade through the projecting portion and reduces the vortex of the air flowing through the bent portion formed in the trailing edge Axial fan for suppression.
The method according to claim 1,
Wherein the protruding portion is formed to be gradually larger in size from the hub side to the outer circumferential side.
The method according to claim 1,
The projecting portion is formed in a shape of a triangle on the side from the leading edge to the trailing edge and is formed in a gentle inclination from the leading edge to the projecting point of the triangular projecting portion on the side surface and is formed as a steep inclination from the projecting point to the trailing edge, Axial fan for suppression.
KR1020160024138A 2016-02-29 2016-02-29 Fan of axial flow suppress for vortex and leakage flow KR20170102097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160024138A KR20170102097A (en) 2016-02-29 2016-02-29 Fan of axial flow suppress for vortex and leakage flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160024138A KR20170102097A (en) 2016-02-29 2016-02-29 Fan of axial flow suppress for vortex and leakage flow

Publications (1)

Publication Number Publication Date
KR20170102097A true KR20170102097A (en) 2017-09-07

Family

ID=59925829

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020160024138A KR20170102097A (en) 2016-02-29 2016-02-29 Fan of axial flow suppress for vortex and leakage flow

Country Status (1)

Country Link
KR (1) KR20170102097A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101870365B1 (en) 2017-12-15 2018-06-22 한국건설기술연구원 Cooling fan apparatus having structure for reducing circulation flow
CN111219362A (en) * 2018-11-27 2020-06-02 中国航发商用航空发动机有限责任公司 Axial compressor blade, axial compressor and gas turbine
CN114876828A (en) * 2021-02-05 2022-08-09 全亿大科技（佛山）有限公司 Fan with cooling device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101870365B1 (en) 2017-12-15 2018-06-22 한국건설기술연구원 Cooling fan apparatus having structure for reducing circulation flow
CN111219362A (en) * 2018-11-27 2020-06-02 中国航发商用航空发动机有限责任公司 Axial compressor blade, axial compressor and gas turbine
CN114876828A (en) * 2021-02-05 2022-08-09 全亿大科技（佛山）有限公司 Fan with cooling device

Similar Documents

Publication Publication Date Title
JP4501575B2 (en) Axial blower
WO2014050146A1 (en) Propeller fan and air conditioner equipped with same
WO2015092924A1 (en) Axial flow fan
JP6914371B2 (en) Axial blower
JP6656372B2 (en) Axial blower
EP1916423A1 (en) Axial flow fan
JP2012241684A (en) Axial fan
JP5562566B2 (en) Wing body for fluid machinery
JP6621194B2 (en) Turbofan and blower using the turbofan
JP2016070089A (en) fan
WO2015146007A1 (en) Air-blowing device
KR20170102097A (en) Fan of axial flow suppress for vortex and leakage flow
JP2012052443A (en) Propeller fan
JP4818310B2 (en) Axial blower
JP2002106494A (en) Axial flow type fan
CN108953222B (en) Centrifugal impeller
CN110939603A (en) Blade and axial flow impeller using same
CN110914553B (en) Impeller, blower and air conditioner
JP2012107538A (en) Axial-flow fan or diagonal-flow fan, and air conditioner mounted outdoor unit with the same
JP6381794B2 (en) Axial blower
WO2018228066A1 (en) Axial flow wind turbine and air-conditioner
JP6060370B2 (en) Blower
JP2006322378A (en) Blower impeller
KR100484824B1 (en) An axial flow fan
JP4243105B2 (en) Impeller

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application