CN212838579U

CN212838579U - Low-noise axial flow fan

Info

Publication number: CN212838579U
Application number: CN202021506437.XU
Authority: CN
Inventors: 郑福桥
Original assignee: Shaoxing Shangyu Shangan Fan Co ltd
Current assignee: Shaoxing Shangyu Shangan Fan Co ltd
Priority date: 2020-07-27
Filing date: 2020-07-27
Publication date: 2021-03-30
Anticipated expiration: 2030-07-27

Abstract

The utility model belongs to the technical field of the fan, especially, relate to a low noise axial fan, which comprises a housin, be located impeller and drive impeller pivoted motor in the casing, the impeller includes that the pressure equipment distributes in a plurality of blades of wheel hub outer fringe department in wheel hub epaxial wheel hub and along the circumference direction, the sawtooth groove has been seted up on the front end reason of blade direction of rotation, the sawtooth groove extends to the outer fringe department of blade by the middle part of blade, the outer fringe department of blade has the water conservancy diversion portion that extends to the rear end reason from the front end reason, a terminal surface of water conservancy diversion portion subtend wheel hub is concave cambered surface, the radial width of water conservancy diversion portion is crescent to the rear end reason by the front. The utility model discloses be provided with water conservancy diversion portion in the outer fringe department of blade, can further increase the effect to gaseous water conservancy diversion through water conservancy diversion portion, increased the speed of detouring of the outflow of air outlet from the air current, and then fine upper and lower grade air current of having avoided combines to be the eddy current loss that takes place the air current collision and cause, and then reaches the purpose of noise reduction.

Description

Low-noise axial flow fan

Technical Field

The utility model belongs to the technical field of the fan, especially, relate to a low noise axial fan.

Background

The axial flow fan has a very wide application, namely, the axial flow fan and the fan blade have the same direction of air flow, such as an electric fan, and an air conditioner outer machine fan is an axial flow type running fan. The "axial flow" is so called because the gas flows parallel to the fan axis. Axial flow fans are typically used in applications where flow requirements are high and pressure requirements are low. The existing axial flow fan has high noise and needs to be improved.

Chinese patent application publication No. CN1865711A discloses a method for reducing noise of an axial flow fan, in which the front end edge (i.e., the end edge facing the wind) in the rotation direction of each blade of the fan is made into a sawtooth profile curve, and the sawtooth may be a rectangular tooth, a triangular tooth or a circular arc tooth. The blade of the axial flow fan manufactured by the method can reduce the aerodynamic noise generated in the working process of the fan to a certain extent, but the effect is not ideal and needs to be improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical problem who exists to the aforesaid, provide an axial fan with low noise.

The purpose of the utility model is realized like this: the utility model provides a low noise axial fan, includes the casing, is located the impeller of casing and drives impeller pivoted motor, its characterized in that: the impeller includes that the pressure equipment distributes in a plurality of blades of wheel hub outer fringe department in wheel hub on the motor shaft and along the circumference direction, the sawtooth groove has been seted up on the leading edge of blade direction of rotation, the sawtooth groove by the middle part of blade extends to the outer fringe department of blade, the outer fringe department of blade has the water conservancy diversion portion that extends to the rear end edge from the leading edge, water conservancy diversion portion subtend a terminal surface of wheel hub is the concave cambered surface, the radial width of water conservancy diversion portion is crescent to the rear end edge by the leading edge.

By adopting the technical scheme, the motor is started, the motor drives the impeller to rotate, at the moment, gas enters the impeller from the axial direction of the air inlet, and is discharged from the air outlet under the pushing of the blade, so as to reduce the noise generated when the impeller works, therefore, the utility model discloses improve the impeller, the front end edge in the rotation direction of the impeller is provided with the sawtooth-shaped groove, the sawtooth-shaped groove extends from the middle part of the blade to the outer edge of the blade, the front end edge of the impeller forms a smooth wave shape which continuously has a concave-convex structure in the radius direction through the sawtooth-shaped groove, and the wave shape can effectively separate the air flow and guide the air flow; the outer fringe department at the blade is provided with water conservancy diversion portion, can further increase the effect to gaseous water conservancy diversion through water conservancy diversion portion, has increased the speed of detouring of the outflow of air current from the air outlet, and then fine avoided the upper and lower stage air current to combine to take place the eddy current loss that the air current collided and caused, and then reach the purpose of noise reduction.

The utility model discloses further set up to: the depth of the saw-tooth-shaped groove is gradually increased from the middle part of the blade to the outer edge of the blade, and the distance between adjacent grooves of the saw-tooth-shaped groove is gradually increased from the middle part of the blade to the outer edge of the blade.

Through adopting above-mentioned technical scheme, the groove depth in sawtooth groove is crescent to the outer fringe department of blade by the middle part of blade to with the interval between the adjacent groove in sawtooth groove by the middle part of blade to the outer fringe department crescent setting of blade, thereby make the great air current group of notch cutting speed in big clearance, the less air current group of notch cutting speed in little clearance, and then improve the separation effect to the air current.

The utility model discloses further set up to: one end face of the blade, facing the motor, is an arc-shaped face protruding outwards, the thickness of the blade is gradually reduced from the middle part to the front end edge and the rear end edge, the ratio of the minimum thickness to the maximum thickness of the blade is 1:1.5-2, and the axial thickness of the flow guide part is consistent with the maximum thickness of the blade.

By adopting the technical scheme, one end face of the blade opposite to the motor is arranged to be an arc-shaped face protruding outwards, so that the strength of the blade is improved, and the blade is not easy to deform; the axial thickness of the flow guide part is set to be consistent with the maximum thickness of the blades, so that the strength of the flow guide part and the flow guide efficiency are improved while the processing is facilitated.

The utility model discloses further set up to: a plurality of noise reduction holes are further formed between the connecting end of each blade and the middle of each blade, and the diameter of each noise reduction hole is 5-8 mm.

By adopting the technical scheme, the noise reduction holes are formed, so that partial airflow flows back to one end face of the motor from one end face of the blade, the airflow distribution condition between the blade and the air outlet of the shell is improved, and the noise reduction effect is achieved.

The utility model discloses further set up to: the blades and the flow guide part are of an integrally formed structure, and the blades are made of magnesium alloy.

By adopting the technical scheme, the magnesium alloy is formed by adding other elements into magnesium as a base and is characterized by small density (1.8 g/cm)³Magnesium alloy is used for manufacturing the blades), the specific strength is high, the specific elastic modulus is large, and the blades have the characteristics of good heat dissipation, good shock absorption and the like.

The utility model discloses further set up to: the inner wall of the shell is also provided with a sound absorption layer made of a mineral wool sound absorption plate.

Through adopting above-mentioned technical scheme, the mineral wool abatvoix is one kind and has good sound effect of inhaling and the light panel of quality, sets up the sound absorbing layer of making by the mineral wool abatvoix on shells inner wall to further improve the noise reduction of whole fan.

The utility model discloses further set up to: the shell is of an annular structure, and a support for supporting is arranged at the lower end of the shell.

Through adopting above-mentioned technical scheme, support and install the casing through the support.

The utility model has the advantages that:

1. the utility model discloses improved the impeller, seted up the sawtooth groove at the leading edge of impeller direction of rotation, the sawtooth groove is extended to the outer fringe department of blade by the middle part of blade, makes the leading edge of impeller form a level and smooth wave shape that has concave-convex structure on the radius direction continuously through this sawtooth groove, and this wave shape can effectually separate the air current, can lead to the air current.

2. The outer fringe department at the blade is provided with water conservancy diversion portion, can further increase the effect to gaseous water conservancy diversion through water conservancy diversion portion, has increased the speed of detouring of the outflow of air current from the air outlet, and then fine avoided the upper and lower stage air current to combine to take place the eddy current loss that the air current collided and caused, and then reach the purpose of noise reduction.

3. Through set up the hole of making an uproar of falling on the blade, can make partial air current from the blade just to a terminal surface of motor to a terminal surface of back to and the motor, and then improve the air current distribution condition between blade and the casing air outlet, and then reach the effect of making an uproar of falling.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of the internal structure of the present invention;

the reference numbers in the figures are: 1. a housing; 11. a sound absorbing layer; 2. an impeller; 21. a hub; 22. a blade; 221. a sawtooth-shaped groove; 222. a flow guide part; 223. a noise reduction hole; 3. a motor; 4. and (4) a bracket.

Detailed Description

In order to make the technical solutions in the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings:

a low-noise axial flow fan, as shown in fig. 1 and fig. 2, comprises a casing 1, an impeller 2 positioned in the casing 1 and a motor 3 driving the impeller 2 to rotate, wherein the casing 1 is in a ring structure, and the lower end part of the casing is provided with a support 4 for supporting and mounting;

wherein, impeller 2 includes that the pressure is adorned in motor 3 epaxial wheel hub 21 and along a plurality of blades 22 of circumferential direction distribution in wheel hub 21 periphery department, sawtooth groove 221 has been seted up on the leading edge of blade 22 direction of rotation, sawtooth groove 221 extends to the outer fringe department of blade 22 by the middle part of blade 22, the outer fringe department of blade 22 has the water conservancy diversion portion 222 that extends to the rear end edge from the leading edge, a terminal surface of water conservancy diversion portion 222 subtend wheel hub 21 is the concave cambered surface, the radial width of water conservancy diversion portion 222 is crescent to the rear end edge by the leading edge.

Starting motor 3, motor 3 drive impeller 2 rotates, and gas gets into impeller 2 from the air intake axial this moment, and under the pushing of blade 22, gas is discharged from the air outlet, for the noise that reduces impeller 2 during operation and send, to this the utility model discloses improve impeller 2, offered sawtooth-shaped groove 221 at the front end edge of impeller 2 direction of rotation, sawtooth-shaped groove 221 extends to the outer fringe department of blade 22 by the middle part of blade 22, make the front end edge of impeller 2 form one through this sawtooth-shaped groove 221 and have the level and smooth wave shape of concave-convex structure in the radius direction continuously, this wave shape can be effectual separates the air current, can lead the air current;

the outer edge of the blade 22 is provided with the flow guide part 222, the effect of gas flow guide can be further increased through the flow guide part 222, the bypassing speed of the air flow flowing out of the air outlet is increased, the eddy loss caused by air flow collision when the upper and lower stages of air flow are combined is well avoided, and the purpose of reducing noise is further achieved.

Optimally, as shown in fig. 1, the groove depth of the sawtooth-shaped groove 221 is gradually increased from the middle of the blade 22 to the outer edge of the blade 22, and the distance between adjacent grooves of the sawtooth-shaped groove 221 is gradually increased from the middle of the blade 22 to the outer edge of the blade 22, so that the notches with large gaps cut airflow clusters with high speed, and the notches with small gaps cut airflow clusters with low speed, and further the separation effect on the airflow is improved.

Preferably, as shown in fig. 2, an end surface of the vane 22 facing the motor 3 is an arc surface protruding outward, the thickness of the vane 22 is gradually reduced from the middle portion to the front end edge and the rear end edge, the ratio of the minimum thickness to the maximum thickness of the vane 22 is 1:1.5-2, and the axial thickness of the flow guide portion 222 is consistent with the maximum thickness of the vane 22. One end surface of the blade 22 opposite to the motor 3 is set to be an arc surface protruding outwards, so that the strength of the blade 22 is improved, and the blade is not easy to deform; the axial thickness of the flow guide part 222 is set to be consistent with the maximum thickness of the blade 22, so that the strength of the flow guide part 222 and the flow guide efficiency thereof are improved while the processing is convenient.

Preferably, as shown in fig. 1, a plurality of noise reduction holes 223 are further formed between the connecting end of the blade 22 and the middle portion thereof, and the diameter of each noise reduction hole 223 is 5mm-8 mm. Through setting up the hole 223 of making an uproar, can make partial air current from blade 22 just to a terminal surface of motor 3 to a terminal surface that is back to and motor 3, and then improve the air current distribution condition between blade 22 and the casing 1 air outlet, and then reach the effect of making an uproar.

Preferably, the blade 22 and the flow guide part 222 are of an integrally formed structure, and the blade 22 is made of magnesium alloy. The magnesium alloy is an alloy formed by adding other elements into magnesium and is characterized by small density (1.8 g/cm)³Magnesium alloy, or the like), high specific strength, large specific modulus, good heat dissipation, good shock absorption, or the like, and thus the magnesium alloy is used to manufacture the blade 22.

Preferably, as shown in fig. 2, the inner wall of the casing 1 is further provided with a sound-absorbing layer 11 made of a mineral wool sound-absorbing plate. The mineral wool acoustic board is a board with good sound absorption effect and light weight, and the sound absorption layer 11 made of the mineral wool acoustic board is arranged on the inner wall of the shell 1 so as to further improve the noise reduction effect of the whole fan.

The above embodiments are only preferred embodiments of the present invention, not all embodiments, and other embodiments obtained based on the above embodiments by those skilled in the art without any creative work shall fall within the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a low noise axial fan, includes casing (1), is located impeller (2) and drive impeller (2) pivoted motor (3) of casing (1), its characterized in that: impeller (2) including the pressure equipment in motor (3) epaxial wheel hub (21) and along a plurality of blades (22) of circumferential direction distribution in wheel hub (21) periphery department, sawtooth groove (221) have been seted up on the leading edge of blade (22) direction of rotation, sawtooth groove (221) by the middle part of blade (22) extends to the outer fringe department of blade (22), the outer fringe department of blade (22) has water conservancy diversion portion (222) that extends to the rear end edge from the leading edge, water conservancy diversion portion (222) subtend the terminal surface of wheel hub (21) is the concave cambered surface, the radial width of water conservancy diversion portion (222) is crescent to the rear end edge by the leading edge.

2. The low-noise axial flow fan according to claim 1, wherein: the depth of the sawtooth-shaped groove (221) is gradually increased from the middle of the blade (22) to the outer edge of the blade (22), and the distance between adjacent grooves of the sawtooth-shaped groove (221) is gradually increased from the middle of the blade (22) to the outer edge of the blade (22).

3. The low-noise axial flow fan according to claim 1, wherein: one end face, facing the motor (3), of the blade (22) is an arc-shaped face protruding outwards, the thickness of the blade (22) is gradually reduced from the middle part to the front end edge and the rear end edge, the ratio of the minimum thickness to the maximum thickness of the blade (22) is 1:1.5-2, and the axial thickness of the flow guide part (222) is consistent with the maximum thickness of the blade (22).

4. The low-noise axial flow fan according to claim 1, wherein: a plurality of noise reduction holes (223) are further formed between the connecting end of the blade (22) and the middle of the blade.

5. The low-noise axial flow fan according to claim 4, wherein: the aperture of the noise reduction hole (223) is 5mm-8 mm.

6. The low-noise axial flow fan according to claim 1, wherein: the blade (22) and the flow guide part (222) are of an integrally formed structure, and the blade (22) is made of magnesium alloy.

7. The low-noise axial flow fan according to claim 1, wherein: the inner wall of the shell (1) is also provided with a sound absorption layer (11) made of a mineral wool sound absorption plate.

8. The low-noise axial flow fan according to claim 1, wherein: the shell (1) is of an annular structure, and a support (4) for supporting is arranged at the lower end of the shell.