CN111894876B

CN111894876B - Fan and dust collector with same

Info

Publication number: CN111894876B
Application number: CN201910369059.0A
Authority: CN
Inventors: 蒋婷婷; 冯国平
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2019-05-05
Filing date: 2019-05-05
Publication date: 2022-02-25
Anticipated expiration: 2039-05-05
Also published as: CN111894876A

Abstract

The invention discloses a fan and a dust collector with the same, comprising: a hub; the blade comprises a plurality of blades, the blades are arranged on the peripheral wall of the hub at intervals, each blade is provided with a leading edge and a trailing edge in the flowing direction of the airflow, the pressure surfaces of the blades are configured to gradually transit from a concave surface to a convex surface, the leading edge of each blade is provided with a convex part which is convex towards the direction far away from the trailing edge of the blade, the end, connected with the hub, of the leading edge of each blade is a first end, the end, far away from the hub, of the leading edge of each blade is a second end, and the connecting line between the first end and the second end is defined as a first connecting line which is positioned at the downstream of the convex part in the flowing direction of the airflow. The fan has good pneumatic performance and low noise.

Description

Fan and dust collector with same

Technical Field

The invention relates to the technical field of fans, in particular to a fan and a dust collector with the fan.

Background

In the related art, products using a blower generally require a high rotational speed and high efficiency of a driving device. Therefore, the noise generated in the running process of the fan is high, and the pneumatic performance of the fan needs to be improved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a fan which is good in pneumatic performance and low in noise.

The invention also provides a dust collector which comprises the fan.

According to the fan of the embodiment of the invention, the fan comprises: a hub; the blade comprises a plurality of blades, the blades are arranged on the peripheral wall of the hub at intervals, each blade is provided with a leading edge and a trailing edge in the flowing direction of the airflow, the pressure surfaces of the blades are configured to gradually transit from a concave surface to a convex surface, the leading edge of each blade is provided with a convex part which is convex towards the direction far away from the trailing edge of the blade, the end, connected with the hub, of the leading edge of each blade is a first end, the end, far away from the hub, of the leading edge of each blade is a second end, and the connecting line between the first end and the second end is defined as a first connecting line which is positioned at the downstream of the convex part in the flowing direction of the airflow.

According to the fan of the embodiment of the invention, the front edge of each blade is provided with the bulge part protruding towards the direction far away from the tail edge of the blade, and the first connecting line is positioned at the downstream of the bulge part in the flowing direction of the airflow. Therefore, the inlet pressure of the impeller can be effectively improved, the boundary layer separation of fluid is relatively late, namely, the fluid separation can be delayed, the vortex breaking is facilitated, the vibration and noise generated when the fan operates are reduced, and the pneumatic performance of the fan is improved.

According to some embodiments of the invention, an angle between the first line and a central axis of rotation of the hub is α, said α satisfying: alpha is more than or equal to 60 degrees and less than or equal to 100 degrees.

In some embodiments of the invention, the α satisfies: α is 73 °.

According to some embodiments of the invention, the plurality of blades includes a plurality of first blades and a plurality of second blades, the first blades are different in size from the second blades, and the plurality of first blades and the plurality of second blades are provided on the outer circumferential wall of the hub in a staggered manner.

According to some embodiments of the invention, the cascade of each said blade near the leading edge portion is formed in an arc.

According to some embodiments of the invention, a leading edge of each of the blades is formed in an arc to define the projection.

According to some embodiments of the invention, the outer contour of the projection is defined by a plurality of line segments connected in series.

According to some embodiments of the invention, the fan is a centrifugal fan or a mixed flow fan.

According to some embodiments of the invention, the protrusion is one.

The dust collector provided by the embodiment of the invention comprises the fan provided by the embodiment of the invention.

According to the dust collector provided by the embodiment of the invention, the fan provided by the embodiment of the invention is arranged, so that the inlet pressure of the impeller can be effectively improved, the separation of the boundary layer of the fluid is relatively late, namely, the separation of the fluid can be delayed, the vortex breaking is facilitated, the vibration and the noise generated when the fan runs are reduced, and the pneumatic performance of the dust collector is further improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic illustration of a wind turbine according to some embodiments of the present disclosure;

FIG. 2 is a cross-sectional view of a wind turbine according to some embodiments of the present invention;

FIG. 3 is a schematic view of a blade according to some embodiments of the invention;

FIG. 4 is a schematic view of a leading edge of a blade according to some embodiments of the invention;

FIG. 5 is a schematic view of the leading edge of a blade according to some embodiments of the invention, wherein the leading edge of the blade is made up of a plurality of line segments;

FIG. 6 is a schematic view of a leading edge of a blade according to some embodiments of the invention, wherein the leading edge of the blade is comprised of a camber line;

FIG. 7 is a schematic view of a wind turbine according to some embodiments of the invention;

FIG. 8 is a schematic view of a wind turbine according to some embodiments of the invention;

FIG. 9 is a schematic view of a wind turbine according to some embodiments of the invention;

FIG. 10 is a schematic view of a cascade according to some embodiments of the invention.

Reference numerals:

a fan 100;

a hub 1; a shaft hole 1 a;

a blade 2; a leading edge 2 a; a trailing edge 2 b; a pressure surface 21; a first connection 22; the projecting portion 23; a first blade 24;

a second blade 25;

and (3) a blade cascade.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A wind turbine 100 according to an embodiment of the present invention is described below with reference to fig. 1-6. The fan 100 may be a centrifugal fan or a mixed flow fan. The fan can be used for a dust collector, a range hood, a blower and the like.

As shown in fig. 1 to 6, a wind turbine 100 according to an embodiment of the present invention includes: a hub 1 and a plurality of blades 2.

Specifically, as shown in fig. 1 to 6, a plurality of blades 2 are provided at intervals on the outer peripheral wall of the hub 1, each blade 2 having a leading edge 2a and a trailing edge 2b in the flow direction of the airflow (the direction of the hollow arrow in fig. 1), and the pressure surfaces 21 of the blades 2 are configured to gradually transition from the concave surface to the convex surface. It follows that the leading edge 2a of each blade 2 extends helically towards the trailing edge 2 b. Therefore, the contact time of each blade 2 and the fluid can be increased to a certain extent, and the fluency of the blades 2 is improved. The hub 1 and the plurality of blades 2 form an impeller of the fan 100, and it should be noted that "leading edge 2 a" is an inlet end of the blade 2, and "trailing edge 2 b" is an outlet end of the blade 2.

The leading edge 2a of each blade 2 has a projection 23 projecting in a direction away from the trailing edge 2b of the blade 2, the end of each blade 2 at which the leading edge 2a is connected to the hub 1 is a first end, the end of each blade 2 at which the leading edge 2a is connected to the hub 1 is a second end, and a line defining between the first and second ends is a first line 22, the first line 22 being located downstream of the projection 23 in the flow direction of the airflow. Therefore, the front edge 2a of each blade 2 protrudes toward the inlet side of the fluid and is located at the upstream of the first connecting line 22, so that the inlet pressure of the impeller can be effectively improved, the boundary layer separation of the fluid is relatively late, i.e., the fluid separation can be delayed, the vortex breaking is facilitated, the vibration and noise generated during the operation of the fan 100 are reduced, and the aerodynamic performance of the fan 100 is improved. It should be noted that "upstream" refers to a position through which gas flows first, and "downstream" refers to a position through which gas flows later.

According to the fan 100 of the embodiment of the present invention, by making the leading edge 2a of each blade 2 have the convex portion 23 convex toward the direction away from the trailing edge 2b of the blade 2, and in the flow direction of the airflow, the first connection line 22 is located downstream of the convex portion 23. Therefore, the inlet pressure of the impeller can be effectively improved, the boundary layer separation of the fluid is relatively late, namely, the fluid separation can be delayed, the vortex breaking is facilitated, the vibration and the noise generated when the fan 100 operates are reduced, and the pneumatic performance of the fan 100 is further improved.

Specifically, as shown in fig. 1 and 2, the fan 100 further includes a driving motor (not shown), the hub 1 is of a shaft structure, a through shaft hole 1a is formed in the center of the hub 1, and when the fan 100 is a centrifugal fan, a motor shaft of the driving motor is adapted to be fixed in the shaft hole 1a to drive the impeller to rotate, so that the fan 100 operates.

As shown in fig. 2, according to some embodiments of the present invention, the first line 22 is at an angle α to the central axis of rotation of the hub 1, α satisfying: alpha is more than or equal to 60 degrees and less than or equal to 100 degrees. Thereby being beneficial to further improving the inlet pressure of the impeller, leading the boundary layer of the fluid to be separated relatively late, delaying the fluid separation, being beneficial to the vortex breaking, reducing the vibration and the noise generated when the fan 100 runs, and further improving the pneumatic performance of the fan 100. Alternatively, 62.5 ≦ α ≦ 95. Optionally, 65 ≦ α < 90 °. Optionally, 68 ≦ α ≦ 87.4.

In some embodiments of the invention, when α satisfies: when the angle alpha is 73 degrees, the inlet pressure of the impeller can be effectively improved, the boundary layer separation of fluid is late, the fluid separation is delayed, the vortex breaking is facilitated, the vibration and the noise generated when the fan 100 operates are reduced, and the aerodynamic performance of the fan 100 is improved.

According to some embodiments of the invention, the plurality of blades 2 is evenly distributed on the peripheral wall of the hub 1. Thereby making the structure of fan 100 distribute evenly, being favorable to improving the reliability of the structure of fan 100. As shown in fig. 1, the plurality of blades 2 are preferably evenly spaced along the circumference of the hub 1 to evenly channel the fluid flowing through them.

As shown in fig. 7 to 9, according to some embodiments of the present invention, the plurality of blades 2 includes a plurality of first blades 24 and a plurality of second blades 25, the first blades 24 are different in size from the second blades 25, and the plurality of first blades 24 and the plurality of second blades 25 are alternately provided on the outer circumferential wall of the hub 1. It can be seen that the hub 1 is provided with first blades 24 and second blades 25 of different sizes. Optionally, the size of the first blade 24 is larger than the size of the second blade 25, the first blade 24 is disposed near the rotation central axis of the hub 1, and the second blade 25 is disposed far away from the rotation central axis of the hub 1, so that the uniformity of the air outlet of the fan 100 can be improved, and the performance of the fan 100 is improved.

Optionally, there is one projection 23. Thereby making the structure of the blade 2 simple and convenient to manufacture.

According to some embodiments of the invention, the number of blades 2 is N, when N satisfies: when N is more than or equal to 7 and less than or equal to 15, the reliability of the structure of the fan 100 can be ensured, and the reliability of the operation of the fan 100 can be ensured. It will be appreciated that the specific number of blades 2 may be specifically set according to actual requirements to better meet the actual design requirements. Specifically, as shown in fig. 1, the number of the blades 2 is 7.

According to some embodiments of the invention, the hub 1 has a cross-section perpendicular to the central axis of rotation of the hub 1, the cross-sectional area of the hub 1 increasing gradually downstream in the flow direction of the air flow. For example, as shown in fig. 1-2, the hub 1 is now formed with a generally conical surface to facilitate fluid flow.

According to some embodiments of the present invention, the cascade 3 of each blade 2 in a portion near the leading edge 2a is formed in an arc shape. Therefore, the inlet pressure of the impeller can be further improved, the separation of the boundary layer of the fluid is relatively late, namely, the separation of the fluid can be delayed, the vortex breaking is facilitated, the vibration and the noise generated when the fan 100 operates are reduced, and the pneumatic performance of the fan 100 is further improved. The cascade 3 is obtained by cutting the turbine blade 2 with the axial cylindrical surface thereof at a certain radius r and then flattening the cut surface into a flat surface.

Alternatively, as shown in fig. 10, the cascade 3 of each blade 2 at a portion near the leading edge 2a may also be formed in a shape defined by a plurality of line segments.

According to some embodiments of the present invention, as shown in fig. 6, the leading edge 2a of each blade 2 is formed in an arc shape to define a convex portion 23. Therefore, the blade profile of each blade 2 is smoother, so that the resistance and friction of the fluid inlet can be effectively reduced, the flow resistance and abrasion of the fluid can be reduced, and the performance of the fan 100 is better. Alternatively, as shown in fig. 5, the leading edge 2a of each blade is defined by a plurality of line segments connected in series.

According to some embodiments of the present invention, as shown in fig. 5, the outer contour of the protrusion 23 is defined by a plurality of line segments connected in series. Thereby making the structure of the projection 23 simple and convenient to manufacture. It should be noted that the outer contour of the protrusion 23 may be defined by an arc, and the outer contour of the protrusion 23 may also be defined by an arc and a line segment, for example, a portion of the protrusion 23 close to the hub 1 is an arc, and a portion far from the hub 1 is a line segment tangent to the arc. As long as it is ensured that the first connection line 22 is located downstream of the projection 23, the aerodynamic performance of the fan 100 is ensured.

The vacuum cleaner according to the embodiment of the present invention includes the fan 100 according to the above-described embodiment of the present invention.

According to the dust collector provided by the embodiment of the invention, the fan 100 provided by the embodiment of the invention is arranged, so that the inlet pressure of the impeller can be effectively improved, the separation of the boundary layer of the fluid is relatively late, namely, the separation of the fluid can be delayed, the vortex breaking is facilitated, the vibration and the noise generated when the fan 100 runs are reduced, and the pneumatic performance of the dust collector is further improved.

Other constructions and operations of the vacuum cleaner according to embodiments of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fan, comprising:

a hub;

a plurality of blades including a plurality of first blades and a plurality of second blades, the first blades having different sizes from the second blades, the plurality of first blades and the plurality of second blades being alternately provided on the outer circumferential wall of the hub, each of the blades having a leading edge and a trailing edge in a flow direction of the airflow, a pressure surface of the blade being configured to gradually transition from a concave surface to a convex surface, a leading edge of each of the blades having a convex portion that is convex in a direction away from the trailing edge of the blade, the leading edge of each of the blades extending spirally toward the trailing edge, an end of each of the blades, at which the leading edge is connected to the hub, being a first end, an end of each of the blades, which the leading edge is away from the hub, being a second end, a line defined between the first end and the second end being a first line, in the flow direction of the airflow, the first line is located the low reaches of bulge, first line with the contained angle between the rotation central axis of wheel hub is alpha, contained angle alpha satisfies: alpha is more than or equal to 68 degrees and less than or equal to 87.4 degrees.

2. The fan of claim 1, wherein a satisfies: α is 73 °.

3. The fan of claim 1 wherein the cascade of each blade proximate the leading edge portion is arcuate.

4. The fan of claim 1 wherein a leading edge of each of the blades is curved to define the projection.

5. The fan of claim 1 wherein the outer profile of the projection is defined by a plurality of line segments connected in series.

6. The fan of claim 1 wherein the fan is a centrifugal fan or a mixed flow fan.

7. The fan of any of claims 1-6, wherein the protrusion is one.

8. A vacuum cleaner, characterized in that it comprises a fan according to any one of claims 1-7.