CN111795001A - Impeller and bladeless fan - Google Patents

Abstract

The invention discloses an impeller and a bladeless fan, comprising: the drainage tube is hollow inside, and the upper end and the lower end of the drainage tube are both opened to form an upper opening and a lower opening respectively; a hub spaced and coaxially disposed within the draft tube to form a draft channel between the draft tube and the hub; the flow guide device comprises a flow guide channel, wherein flow guide blades are arranged in the flow guide channel and are uniformly distributed in the flow guide channel in a circumferential array mode, the flow guide blades extend in the direction away from a hub along the axial direction of the hub, and therefore the projection of each side face of each flow guide blade on the hub is a projection line. The impeller of present case reduces the use of slider when making the impeller for the die sinking degree of difficulty reduces, practices thrift the cost.

Description

Impeller and bladeless fan

Technical Field

The invention relates to the field of bladeless fans, in particular to an impeller and a bladeless fan.

Background

In the bladeless fan field, it is known to use impellers of different configurations to achieve air flow acceleration. In the course of studying and realizing the acceleration of the air flow, the inventor finds that the impeller in the prior art has at least the following problems:

firstly, the guide vane has an inclination angle which changes along the length of the guide vane to form a three-dimensional guide vane, a certain number of slide blocks are needed during manufacturing, and when the mold is opened, the guide vane is easily damaged, so that the difficulty of opening the mold is increased; secondly, the diameter of the impeller is limited by the three-dimensional guide vanes, so that the wind power generated by the impeller cannot be improved, and the noise phenomenon cannot be solved.

Accordingly, there is a need for an impeller and a bladeless fan to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention mainly aims to provide the impeller and the bladeless fan, wherein the two-dimensional guide vanes are replaced by the three-dimensional guide vanes by changing the deflection angle of the impeller, so that the use of sliding blocks in the process of manufacturing the impeller is reduced, the mold opening difficulty is reduced, and the cost is saved.

Another object of the present invention is to provide an impeller and a bladeless fan, which can increase the diameter of the impeller by changing the profile of the impeller, thereby increasing the wind power of the impeller, and reducing the noise at the same level of the rotation speed as the three-dimensional guide vanes.

To achieve the above objects and other advantages in accordance with the present invention, there is provided an impeller and a bladeless fan, including:

the drainage tube is hollow inside, and the upper end and the lower end of the drainage tube are both opened to form an upper opening and a lower opening respectively;

a hub spaced and coaxially disposed within the draft tube to form a draft channel between the draft tube and the hub;

the flow guide device comprises a flow guide channel, wherein flow guide blades are arranged in the flow guide channel and are uniformly distributed in the flow guide channel in a circumferential array mode, the flow guide blades extend in the direction away from a hub along the axial direction of the hub, and therefore the projection of each side face of each flow guide blade on the hub is a projection line.

Preferably, the guide vanes are self-integral with the hub.

Preferably, the guide vane includes an introduction section and a discharge section sequentially arranged along a flow direction of the air flow, and a radius of curvature of the introduction section is set such that the flow direction of the air flow coincides with a tangential direction at an inlet of the introduction section.

Preferably, the radius of curvature of the lead-in section is smaller than the radius of curvature of the lead-out section.

Preferably, the deflection direction of the lead-in section is opposite to the deflection direction of the lead-out section.

Preferably, a short blade is arranged between every two guide vanes;

the curvature radius and the deflection direction of the short blade are consistent with those of the derivation section.

Preferably, a protrusion or a groove is arranged between every two guide vanes.

Preferably, the included angle between the generatrix of the hub and the axis of the hub is alpha;

the included angle alpha ranges from 30 degrees to 90 degrees.

Preferably, the cross-sectional aperture of the draft tube is gradually increased in the direction of the flow of the gas stream.

Furthermore, the present disclosure also discloses a bladeless fan including the impeller of any one of the above aspects.

One of the above technical solutions has the following advantages or beneficial effects: the deflection angle of the impeller is changed, the two-dimensional guide vanes are replaced by the three-dimensional guide vanes, the use of the sliding blocks in the impeller manufacturing process is reduced, the die opening difficulty is reduced, the cost is saved, and the die opening efficiency is improved.

Another technical scheme in the above technical scheme has the following advantages or beneficial effects: the diameter of the impeller is increased by changing the molded line of the impeller, so that the wind power of the impeller is improved, and meanwhile, when the rotating speed of the impeller is the same as that of the three-dimensional guide vane, the noise is reduced to some extent, and the working efficiency of the impeller is improved.

Drawings

Fig. 1 is a schematic perspective view of an impeller according to an embodiment of the present invention;

fig. 2 is a plan sectional view of an impeller according to an embodiment of the present invention;

FIG. 3 is a bottom view of a portion of a proposed impeller according to one embodiment of the present invention;

FIG. 4 is a schematic perspective view of a portion of a proposed impeller according to one embodiment of the present invention;

FIG. 5 is a bottom view of a portion of a proposed impeller according to one embodiment of the present invention;

fig. 6 is a perspective view of a portion of an impeller according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components.

In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc., are defined with respect to the configurations shown in the respective drawings, and in particular, "height" corresponds to a dimension from top to bottom, "width" corresponds to a dimension from left to right, "depth" corresponds to a dimension from front to rear, which are relative concepts, and thus may be varied accordingly depending on the position in which it is used, and thus these or other orientations should not be construed as limiting terms.

Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

According to an embodiment of the present invention, as shown in fig. 1 and 2, it can be seen that the impeller includes:

the drainage tube 1 is hollow inside and is provided with an upper opening and a lower opening at the upper end and the lower end respectively;

a hub 3 disposed at an interval and coaxially inside the draft tube 1 to form a draft passage between the draft tube 1 and the hub 3, the hub 3 being hollow inside and having a driver disposed therein, although not shown in the drawings, it being understood that the driver serves as a power source for accelerating the air flow.

Wherein, be equipped with guide vane 2 in the drainage channel, guide vane 2 is that the circumference array evenly arranges in drainage channel, just guide vane 2 follows wheel hub 3's axial direction is to keeping away from extend in wheel hub 3's the direction, the projection of guide vane 2 on wheel hub 3 is the projection line, is enough to explain, guide vane 2 with wheel hub 3's inclination can not change along with guide vane 2's length variation, guide vane 2 is two-dimentional guide vane 2.

Further, the guide vane 2 is two-dimensional, so that the use of a sliding block can be reduced when the impeller is manufactured and opened, the mold opening cost is reduced, the mold can be quickly removed, the mold removal difficulty is reduced, and the damage to the guide vane 2 during mold removal is avoided.

The two-dimensional guide vanes 2 have small limitation on the diameter of the impeller, the diameter of the impeller can be properly increased by using the two-dimensional guide vanes 2, the flow velocity of air flow generated by the impeller is further improved, and the working efficiency is improved; and when the two-dimensional guide vane 2 and the three-dimensional guide vane are in the same rotating speed, the two-dimensional guide vane can also reduce the noise of the impeller, and the noise reduction effect is achieved.

Referring now to fig. 3 in conjunction with fig. 2, it can be clearly seen that the guide vane 2 is self-integrated with the hub 3, the guide vane 2 comprises an inlet section 21 and an outlet section 22 which are arranged in sequence along the flow direction of the air flow, and the radius of curvature of the inlet section 21 is arranged such that the flow direction of the air flow coincides with the tangential direction at the inlet of the inlet section 21; the curvature radius of the leading-in section 21 is smaller than that of the leading-out section 22, the leading-in section 21 and the leading-out section 22 are in smooth transition, and the problem of noise caused by unsmooth air flow is further solved.

The direction of deflection of the lead-in section 21 is opposite to the direction of deflection of the lead-out section 22. The air flow enters the drainage channel from the lower opening of the drainage tube 1, enters along the introducing section 21 first, flows in the drainage channel and finally flows out along the leading-out section 22; the gradient force of the airflow in the flow guiding channel is changed from negative pressure gradient in the leading-in section 21 to positive pressure gradient in the leading-out section 22, so that the airflow is dispersed after passing through the leading-in section 21, the airflow is converged in the leading-out section 22, and the wind power is strengthened again.

Secondly, the deflection direction of the leading-in section 21 can enable the airflow entering the drainage channel to flow upwards in a vortex shape clockwise or anticlockwise, and the deflection direction of the leading-out section 22 is opposite to that of the leading-in section 21, so that the airflow rotating clockwise or anticlockwise is guided in the opposite deflection direction of the leading-out section 22, the flow direction of the corrected airflow is consistent with the axial direction of the drainage tube 1, the smoothness of airflow circulation is improved, and the generation of noise is reduced.

Referring to fig. 3, a protrusion 31 or a groove is arranged between every two guide vanes 2; referring to fig. 5, a short vane 32 is disposed between each two guide vanes 2, and the radius of curvature and the deflection direction of the short vane 32 are identical to those of the leading-out section 22, and in order to more clearly show the difference between fig. 3 and 5, reference will now be made to fig. 4 and 6. Fig. 4 shows the projection 31 or groove structure in the embodiment of fig. 3 from another perspective, while fig. 6 shows the construction of the short blade in the embodiment of fig. 5 from another perspective. The short blades 32 and the protrusions 31 or the grooves are on the surface of the hub 3 facing the drainage channel, and in a specific embodiment, only the short blades 32, only the protrusions 31 or the grooves may exist between every two guide blades 2, or a combination of the short blades 32 and the protrusions 31 or the grooves may exist. The short blades 32 and the protrusions 31 or the grooves both help to disturb the vortex in the flow guide channel of the impeller, and reduce the energy loss in the impeller, thereby achieving the effects of improving the efficiency and reducing the noise generation.

The shape of the protrusion 31 or the groove can be any shape, and is particularly preferably a hemisphere; the deflection direction of the short blade 32 is the same as that of the leading-out section 22, the short blade 32 is arranged at the airflow outflow section, and the short blade 32 not only has the function of damaging the vortex in the drainage channel, but also has the function of increasing air pressure, so that the working efficiency of the impeller is further improved.

The included angle between the bus of the hub 3 and the axis of the hub 3 is alpha, the included angle alpha ranges from 30 degrees to 90 degrees, the included angle alpha can improve the strength of the air flow in the range, the working efficiency is further improved, and the convergence of the air flow is enhanced. If the angle α is less than 30 °, the air streams will be separated in the outflow section, so that the discharged air stream is not sufficiently windy.

The section caliber of the drainage tube 1 is gradually increased in the direction of air flow, and the section caliber of the hub 3 is gradually decreased in the opposite direction of the air flow. The drainage tube 1 has the advantage of enlarging the air inlet volume, and as the section caliber of the drainage tube 1 is gradually increased in the airflow flowing direction, the section caliber of the lower opening is the minimum, and the lower opening is the air inlet part, a large amount of airflow is gathered in the drainage tube 1. When entering the draft tube 1, the air flow follows the principle of "when the fluid moves in the tube, the flow velocity is high at the small section and the flow velocity is low at the large section", so the air flow is accelerated continuously.

The hub 3 is higher than the draft tube 1 in level so that the hub 3 can also guide the direction of the air flow after the air flow exits the draft tube 1.

The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. An impeller, comprising:

the drainage tube (1) is hollow inside, and the upper end and the lower end of the drainage tube are both open so as to form an upper opening and a lower opening respectively;

a hub (3) spaced and coaxially arranged inside the draft tube (1) to form a draft channel between the draft tube (1) and the hub (3);

wherein, be equipped with guide vane (2) in the drainage channel, guide vane (2) are the circumference array and evenly arrange in drainage channel, just guide vane (2) are followed the axial direction of wheel hub (3) is to keeping away from extend in the direction of wheel hub (3), so that the projection of each side of guide vane (2) on wheel hub (3) is the projection line.

2. The impeller according to claim 1, characterized in that the guide vanes (2) are self-integral with the hub (3).

3. The impeller as claimed in claim 1, characterised in that the guide vane (2) comprises an inlet section (21) and an outlet section (22) arranged one after the other in the flow direction of the gas flow, the radius of curvature of the inlet section (21) being such that the flow direction of the gas flow coincides with the tangential direction at the inlet of the inlet section (21).

4. An impeller according to claim 3, characterized in that the radius of curvature of the lead-in section (21) is smaller than the radius of curvature of the lead-out section (22).

5. An impeller according to claim 3, wherein the direction of deflection of the lead-in section (21) is opposite to the direction of deflection of the lead-out section (22).

6. The impeller as claimed in claim 1, characterised in that a short blade (32) is provided between two guide vanes (2);

the radius of curvature and the deflection direction of the short blade (32) coincide with the radius of curvature and the deflection direction of the lead-out section (22).

7. The impeller as claimed in claim 1, characterized in that between two guide vanes (2) there are provided projections (31) or recesses.

8. The impeller according to claim 1, characterized in that the generatrix of the hub (3) is at an angle α to the axis of the hub (3);

the included angle alpha ranges from 30 degrees to 90 degrees.

9. The impeller as claimed in claim 1, characterised in that the cross-sectional aperture of the draft tube (1) is of increasing magnitude in the direction of flow of the gas stream.

10. A bladeless fan comprising an impeller according to claims 1-9.

Images