CN114150608A - In-line double-impeller blower - Google Patents
In-line double-impeller blower Download PDFInfo
- Publication number
- CN114150608A CN114150608A CN202111487200.0A CN202111487200A CN114150608A CN 114150608 A CN114150608 A CN 114150608A CN 202111487200 A CN202111487200 A CN 202111487200A CN 114150608 A CN114150608 A CN 114150608A
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- impeller
- air
- duct
- blower
- motor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0809—Loosening or dislodging by blowing ; Drying by means of gas streams
Abstract
The invention belongs to the technical field of gardening tools, and particularly relates to an in-line double-impeller blower which comprises an air duct; a first impeller; a second impeller; and a drive unit; the first impeller and the second impeller are sequentially arranged in the air duct from the air inlet to the air outlet of the air duct; the first impeller and the second impeller are coaxially arranged; when the first impeller and the second impeller rotate, air between the first impeller and the second impeller can be compressed. The invention compresses the air between the two impellers, so that the air can quickly pass through the second impeller and be blown out from the air outlet, and further the driving unit can generate larger wind power at a smaller rotating speed. The first motor and the second motor are adopted to respectively drive the first impeller and the second impeller to rotate, so that the limit performance of the hair dryer can be effectively improved, and in addition, under the condition of the same wind power requirement, the motor can be operated at a lower rotating speed, so that the vibration and the noise are reduced.
Description
Technical Field
The invention belongs to the technical field of garden tools, and particularly relates to an in-line double-impeller blower.
Background
In the maintenance work in gardens, need sweep rubbish such as fallen leaves, grit with the hair-dryer, this needs just to have great air supply ability for the hair-dryer, can only increase wind-force through improving motor speed among the prior art, but this kind of mode can produce strong vibration and noise, is unfavorable for operating personnel to work for a long time on the one hand, and on the other hand also can cause the influence to peripheral life, operational environment. In addition, most hair dryers in the prior art are of a single-motor structure, and in order to meet the requirement of portability of the hair dryer, the power of a motor which can be used is limited, so that the limit performance of the hair dryer is limited, and the use requirement is difficult to meet.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an in-line dual-impeller blower that is capable of effectively reducing vibration and noise and improving the ultimate performance of the blower while satisfying the performance requirements.
To achieve the above and other related objects, the present invention provides an in-line dual impeller blower comprising:
one end of the air duct is an air inlet, and the other end of the air duct is an air outlet;
the first impeller is arranged in the air duct;
the second impeller is arranged in the air duct; and
the driving unit is arranged in the air duct and used for driving the first impeller and the second impeller to rotate;
the first impeller and the second impeller are sequentially arranged in the air duct from the air inlet to the air outlet of the air duct; the first impeller and the second impeller are coaxially arranged, and the air supply directions of the first impeller and the second impeller are the same;
the air duct, the first impeller, the second impeller and the drive unit are configured to compress air between the first impeller and the second impeller when the first impeller and the second impeller rotate.
In an alternative embodiment of the invention, the diameter of the first impeller is larger than the diameter of the second impeller.
In an optional embodiment of the present invention, an inner diameter of a section of the air duct corresponding to the first impeller is larger than an inner diameter of a section of the air duct corresponding to the second impeller.
In an alternative embodiment of the invention, the number of blades of the first impeller is smaller than the number of blades of the second impeller.
In an alternative embodiment of the present invention, the rotational speed of the first impeller is greater than the rotational speed of the second impeller.
In an alternative embodiment of the present invention, the driving unit includes a first motor and a second motor, the first impeller is connected to a main shaft of the first motor, and the second impeller is connected to a main shaft of the second motor.
In an optional embodiment of the present invention, the air duct includes a first duct, a connecting pipe, a second duct, and a blow pipe, and the first duct, the connecting pipe, the second duct, and the blow pipe are sequentially arranged from the air inlet to the air outlet and are communicated with each other.
In an alternative embodiment of the invention, the first electric machine is mounted in the first duct and the second electric machine is mounted in the second duct.
In an optional embodiment of the present invention, the first motor and the second motor are respectively provided with a flow guiding cone at one end facing the air outlet.
In an optional embodiment of the invention, the first duct, the connecting pipe and the second duct are externally provided with a shell, and the shell is provided with a handle part and a battery pack bin.
In an alternative embodiment of the present invention, a transition pipe is further formed on the housing, and the transition pipe is connected between the second duct and the blow pipe.
In an alternative embodiment of the invention, the blow pipe is detachably connected to the transition pipe.
In an optional embodiment of the present invention, an air duct is connected to an end of the first duct facing the air inlet, and a through-flow cross section of the air duct gradually decreases from the air inlet to the first duct.
In an optional embodiment of the present invention, the air inlet is provided with a mesh-shaped air window, and the air window is fixedly connected to the housing.
The invention has the technical effects that:
the invention compresses the air between the two impellers, so that the air can quickly pass through the second impeller and be blown out from the air outlet, and further the driving unit can generate larger wind power at a smaller rotating speed.
The first motor and the second motor are adopted to respectively drive the first impeller and the second impeller to rotate, so that the limit performance of the hair dryer can be effectively improved, and in addition, under the condition of the same wind power requirement, the motor can be operated at a lower rotating speed, so that the vibration and the noise are reduced.
The air supply rate that this embodiment made first impeller and second impeller through the difference of impeller diameter is different, and specific saying so, the air supply volume in the first impeller unit interval is greater than the air supply volume in the second impeller unit interval, consequently can produce the compression to the air between first impeller and the second impeller, and the hair-dryer during operation as long as guarantee that the rotational speed of first impeller is greater than or equal to the rotational speed of second impeller can, control process is simple.
The air duct of the invention adopts a sectional type design, so that the first motor, the second motor, the first impeller, the second impeller and other accessories are easier to install in the air duct.
The diversion cone can prevent the first motor and the second motor from generating turbulent flow towards one end of the air outlet. The blowpipe of wind channel front end is convenient for change, can adapt to different use scenes.
Drawings
Figure 1 is an exploded view of an in-line dual impeller blower provided by an embodiment of the present invention.
Figure 2 is a perspective view of an in-line dual impeller blower provided by an embodiment of the present invention;
figure 3 is a top view of an in-line dual impeller blower provided by an embodiment of the present invention;
figure 4 is a cross-sectional view of an in-line dual impeller blower provided by an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1-4, the technical solution of the present invention will be described in detail with reference to the following embodiments of a portable hair dryer for garden maintenance, and it should be emphasized that the in-line dual-impeller hair dryer of the present invention can be applied not only to portable hair dryers, but also to other garden tools, such as backpack hair dryers, vehicle-mounted hair dryers, etc., which have the same or similar application scenarios as the following embodiments.
Referring to fig. 1 to 4, a hand-held hair dryer for use in garden maintenance includes a duct 10, a first impeller 21, a second impeller 22, a drive unit, a handle portion 31 and a battery pack compartment 32.
Referring to fig. 1-4, the air duct 10 is a cylindrical structure with two open ends, one end of the air duct 10 is an air inlet, and the other end is an air outlet; it will be appreciated that at least some sections of the duct 10 are rigid tubes for mounting an impeller, motor or other accessory; in one embodiment, the air duct 10 may be, for example, a completely rigid pipe, so that an operator can easily control the air supply direction; on the other hand, the air duct 10 may also have a portion of flexible duct, so that the air outlet can flexibly extend into various dead angles.
Referring to fig. 1 to 4, the driving unit is installed in the air duct 10 and is used for driving the first impeller 21 and the second impeller 22 to rotate; in a specific embodiment, the driving unit includes a first motor 23 and a second motor 24, the first impeller 21 is connected to a main shaft of the first motor 23, and the second impeller 22 is connected to a main shaft of the second motor 24, in this embodiment, the first motor 23 and the second motor 24 are respectively used for driving the first impeller 21 and the second impeller 22 to rotate, so that the limit performance of the hair dryer can be effectively improved, and in addition, under the condition of the same wind power requirement, the motor of the present invention can operate at a lower rotating speed, thereby reducing vibration and noise.
Referring to fig. 1 to 4, the first impeller 21 and the second impeller 22 are sequentially disposed in the air duct 10 from an air inlet to an air outlet of the air duct 10; the first impeller 21 and the second impeller 22 are coaxially arranged, and the air supply directions of the first impeller 21 and the second impeller 22 are the same; it will be appreciated that, in order to ensure the blowing effect of the impeller, the diameter of the impeller should be adapted to the inner diameter of the air duct 10, i.e. the edge of the impeller should be as close as possible to the inner wall of the air duct 10. In a specific embodiment, the rotation directions of the first impeller 21 and the second impeller 22 are not particularly required, and it is sufficient to ensure that the blowing directions of the first impeller 21 and the second impeller 22 are the same, for example, the rotation directions of the first impeller 21 and the second impeller 22 may be the same or opposite, when the rotation directions of the first impeller 21 and the second impeller 22 are the same, the blade inclination directions of the first impeller 21 and the second impeller 22 should be the same, and when the rotation directions of the first impeller 21 and the second impeller 22 are opposite, the blade inclination directions of the first impeller 21 and the second impeller 22 should be opposite.
Referring to fig. 1 to 4, the air duct 10, the first impeller 21, the second impeller 22 and the driving unit are configured to compress air between the first impeller 21 and the second impeller 22 when the first impeller 21 and the second impeller 22 rotate. It is understood that, in the present invention, there are various means for compressing the air between the first impeller 21 and the second impeller 22, for example, the first impeller 21 and the second impeller 22 may be controlled to rotate at different speeds, for example, the density or the inclination angle of the blades of the first impeller 21 and the second impeller 22 may be set to be different, and for example, the air duct 10 may be set to have a cone-shaped structure. The invention compresses the air between the two impellers, and under the action of the first impeller on the air, the speed of the air reaching the second impeller 22 is higher than that of the air generated by the second impeller 22, so that the air can more quickly pass through the second impeller 22 and be blown out from the air outlet, and further the driving unit can generate larger wind power at a smaller rotating speed. The present invention generates a larger wind force at the same driving speed than a fan using a single impeller (an impeller having the same specification as the second impeller 22).
Referring to fig. 1-4, in an embodiment of the present invention, the diameter of the first impeller 21 is larger than that of the second impeller 22, and accordingly, in order to match the sizes of the first impeller 21 and the second impeller 22, the inner diameter of the section of the air duct 10 corresponding to the first impeller 21 is larger than that of the section of the air duct 10 corresponding to the second impeller 22. It can be understood that in the present embodiment, the air supply rates of the first impeller 21 and the second impeller 22 are different through the difference of the diameters of the impellers, specifically, the air supply volume of the first impeller 21 per unit time is larger than that of the second impeller 22 per unit time, so that the air between the first impeller 21 and the second impeller 22 can be compressed, when the blower is operated, as long as the rotation speed of the first impeller 21 is greater than or equal to that of the second impeller 22, the control process is simple.
Referring to fig. 1 to 4, in the embodiment of the present invention, the number of blades of the first impeller 21 is smaller than that of the second impeller 22. It can be understood that the number of blades of the first impeller 21 should be smaller than the number of the second impeller 22 within a reasonable range, the number of blades can directly influence the flow area of the impeller, thereby influencing the air supply efficiency, the number of blades should not be too much and too little, the number of blades too much can lead to the reduction of the flow area, the wind resistance is increased, this can reduce the air supply efficiency of the impeller on the contrary, and the number of blades too little can lead to insufficient wind pressure, the air supply efficiency can be reduced equally, in practical application, the number of blades of the first impeller 21 should be no less than three.
Referring to fig. 1-4, in an embodiment, the rotation speed of the first impeller 21 is greater than that of the second impeller 22. It can be understood that under the premise that other condition parameters are the same, higher rotating speed can necessarily generate higher air supply efficiency, and the embodiment directly realizes the compression of air through the rotating speed difference between the first impeller 21 and the second impeller 22, so that the structure is simpler.
It is to be understood that the present invention may be used in any of the above manners to compress air, or a combination of the above.
Referring to fig. 1 to 4, in an embodiment, the air duct 10 includes a first duct 11, a connecting pipe 12, a second duct 13, and a blow pipe 14, and the first duct 11, the connecting pipe 12, the second duct 13, and the blow pipe 14 are sequentially arranged from an air inlet to an air outlet and are communicated with the air outlet. The first motor 23 is installed in the first duct 11, and the second motor 24 is installed in the second duct 13. It will be appreciated that the air chute 10 of the present invention is of a segmented design, allowing the first motor 23, the second motor 24, the first impeller 21, the second impeller 22, and other accessories to be more easily installed into the air chute 10.
Referring to fig. 1 to 4, the first motor 23 and the second motor 24 are respectively provided with a diversion cone 203 at one end facing the air outlet. It can be understood that the diversion cone 203 can prevent the first motor 23 and the second motor 24 from generating turbulence toward the end of the air outlet.
Referring to fig. 1 to 4, a housing 30 is disposed outside the first duct 11, the connecting pipe 12 and the second duct 13, and the handle 31 and the battery compartment 32 are formed on the housing 30. The housing 30 is further formed with a transition pipe 33, and the transition pipe 33 is connected between the second duct 13 and the blow pipe 14. The blow pipe 14 is detachably connected to the transition pipe 33. It will be appreciated that the operator may replace the blow tube 14, for example replacing a blow tube 14 having a differently shaped outlet, to suit different usage scenarios.
Referring to fig. 1 to 4, in an embodiment of the present invention, an air duct 201 is connected to an end of the first duct 11 facing the air inlet, and a through-flow cross-section of the air duct 201 is gradually reduced from the air inlet to the first duct 11. The air inlet is provided with a reticular air window 202, and the air window 202 is fixedly connected with the shell 30.
In summary, the present invention compresses the air between the two impellers, so that the air can more quickly pass through the second impeller 22 and be blown out from the air outlet, and further, the driving unit can generate a large wind force at a small rotation speed. The first motor 23 and the second motor 24 are adopted to drive the first impeller 21 and the second impeller 22 to rotate respectively, so that the limit performance of the hair dryer can be effectively improved, and in addition, under the condition of the same wind power requirement, the motor can be operated at a lower rotating speed, so that the vibration and the noise are reduced. In the embodiment, the air supply rates of the first impeller 21 and the second impeller 22 are different through the difference of the diameters of the impellers, specifically, the air supply volume of the first impeller 21 in unit time is larger than that of the second impeller 22 in unit time, so that the air between the first impeller 21 and the second impeller 22 can be compressed, when the blower works, as long as the rotating speed of the first impeller 21 is larger than or equal to that of the second impeller 22, the control process is simple. The air chute 10 of the present invention is a segmented design that allows the first motor 23, the second motor 24, the first impeller 21, the second impeller 22, and other accessories to be more easily installed into the air chute 10. The diversion cone 203 can prevent the first motor 23 and the second motor 24 from generating turbulence towards one end of the air outlet. The blowing pipe 14 at the front end of the air duct 10 is convenient to replace and can adapt to different use scenes.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of embodiments of the invention.
Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily in all embodiments, of the present invention. Thus, appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the present invention.
It will also be appreciated that one or more of the elements shown in the figures can also be implemented in a more separated or integrated manner, or even removed for inoperability in some circumstances or provided for usefulness in accordance with a particular application.
Additionally, any reference arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise expressly specified. Further, as used herein, the term "or" is generally intended to mean "and/or" unless otherwise indicated. Combinations of components or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.
As used in the description herein and throughout the claims that follow, "a," "an," and "the" include plural references unless otherwise indicated. Also, as used in the description herein and throughout the claims that follow, the meaning of "in …" includes "in …" and "on …" unless otherwise indicated.
The above description of illustrated embodiments of the invention, including what is described in the abstract of the specification, is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. While specific embodiments of, and examples for, the invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention, as those skilled in the relevant art will recognize and appreciate. As indicated, these modifications may be made to the present invention in light of the foregoing description of illustrated embodiments of the present invention and are to be included within the spirit and scope of the present invention.
The systems and methods have been described herein in general terms as the details aid in understanding the invention. Furthermore, various specific details have been given to provide a general understanding of the embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.
Thus, although the present invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the invention will be employed without a corresponding use of other features without departing from the scope and spirit of the invention as set forth. Thus, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention is to be determined solely by the appended claims.
Claims (14)
1. An in-line dual impeller blower comprising:
one end of the air duct is an air inlet, and the other end of the air duct is an air outlet;
the first impeller is arranged in the air duct;
the second impeller is arranged in the air duct; and
the driving unit is arranged in the air duct and used for driving the first impeller and the second impeller to rotate;
the first impeller and the second impeller are sequentially arranged in the air duct from the air inlet to the air outlet of the air duct; the first impeller and the second impeller are coaxially arranged, and the air supply directions of the first impeller and the second impeller are the same;
the air duct, the first impeller, the second impeller and the drive unit are configured to compress air between the first impeller and the second impeller when the first impeller and the second impeller rotate.
2. The in-line dual impeller blower of claim 1, wherein the diameter of said first impeller is greater than the diameter of said second impeller.
3. The in-line dual impeller blower of claim 1 or 2, wherein the inner diameter of the section of the air chute corresponding to the first impeller is larger than the inner diameter of the section of the air chute corresponding to the second impeller.
4. The in-line dual impeller blower of claim 1 or 2, wherein the number of blades of the first impeller is less than the number of blades of the second impeller.
5. The in-line dual impeller blower of claim 1 or 2, wherein the rotational speed of the first impeller is greater than the rotational speed of the second impeller.
6. The in-line dual impeller blower of claim 1, wherein said drive unit includes a first motor and a second motor, said first impeller being connected to a spindle of the first motor and said second impeller being connected to a spindle of the second motor.
7. The in-line dual-impeller blower of claim 6, wherein the air duct comprises a first duct, a connecting pipe, a second duct and a blow pipe, and the first duct, the connecting pipe, the second duct and the blow pipe are arranged in sequence and communicate from the air inlet to the air outlet.
8. The in-line dual impeller blower of claim 7, wherein said first motor is mounted within said first duct and said second motor is mounted within said second duct.
9. The in-line dual-impeller blower of claim 6 wherein the first and second motors are each provided with a deflector cone at an end facing the outlet vent.
10. The in-line dual impeller blower of claim 7 wherein the first duct, connecting tube and second duct are externally provided with a housing having a handle portion and a battery pack compartment formed thereon.
11. An in-line dual impeller blower as claimed in claim 10 wherein said housing further defines a transition duct, said transition duct being connected between said second duct and said blow tube.
12. An in-line dual impeller blower as claimed in claim 11 wherein said blow tube is removably connected to said transition tube.
13. The in-line dual-impeller hair dryer of claim 7, wherein an air duct is connected to an end of the first duct facing the air inlet, and a flow cross section of the air duct is gradually reduced from the air inlet to the first duct.
14. The in-line dual-impeller blower of claim 10 wherein said inlet is provided with a mesh-like louver, said louver being fixedly attached to said housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111487200.0A CN114150608A (en) | 2021-12-06 | 2021-12-06 | In-line double-impeller blower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111487200.0A CN114150608A (en) | 2021-12-06 | 2021-12-06 | In-line double-impeller blower |
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| CN114150608A true CN114150608A (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111487200.0A Pending CN114150608A (en) | 2021-12-06 | 2021-12-06 | In-line double-impeller blower |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751184A (en) * | 2003-03-13 | 2006-03-22 | 山洋电气株式会社 | Contra-rotating axial flow blower |
| CN103671175A (en) * | 2013-12-31 | 2014-03-26 | 常州格力博有限公司 | Axial-flow blower |
| CN205934814U (en) * | 2016-07-26 | 2017-02-08 | 宁波利豪机械有限公司 | Handheld axial -flow type hair -dryer |
| US20170159674A1 (en) * | 2015-12-03 | 2017-06-08 | The Boeing Company | Variable-Geometry Ducted Fan |
| CN206309618U (en) * | 2016-12-09 | 2017-07-07 | 杭州微光电子股份有限公司 | Double-vane fan |
| CN212267852U (en) * | 2020-06-08 | 2021-01-01 | 吉林大学 | Water-air integrated electric culvert power system |
-
2021
- 2021-12-06 CN CN202111487200.0A patent/CN114150608A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751184A (en) * | 2003-03-13 | 2006-03-22 | 山洋电气株式会社 | Contra-rotating axial flow blower |
| CN103671175A (en) * | 2013-12-31 | 2014-03-26 | 常州格力博有限公司 | Axial-flow blower |
| US20170159674A1 (en) * | 2015-12-03 | 2017-06-08 | The Boeing Company | Variable-Geometry Ducted Fan |
| CN205934814U (en) * | 2016-07-26 | 2017-02-08 | 宁波利豪机械有限公司 | Handheld axial -flow type hair -dryer |
| CN206309618U (en) * | 2016-12-09 | 2017-07-07 | 杭州微光电子股份有限公司 | Double-vane fan |
| CN212267852U (en) * | 2020-06-08 | 2021-01-01 | 吉林大学 | Water-air integrated electric culvert power system |
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