FAN AND CLEANING DEVICE WITH SAME

A fan and a cleaning device are provided. The fan has a housing assembly, a fan cover, a wind wheel, and a first diffuser. The fan cover is mounted on the housing assembly and fits with the housing assembly to form an accommodating cavity. The wind wheel is provided in the accommodating cavity and fits with a side wall of the accommodating cavity to form an air inlet channel. The first diffuser is provided in the accommodating cavity, and has first fan blades and a mounting hub. The mounting hub, the first fan blades and the side wall of the accommodating cavity together provide a first diffusion channel. The air inlet channel is in communication with the first diffusion channel in series.

Skip to: Description  ·  Claims  · Patent History  ·  Patent History
Description
CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2022/079376 filed on Mar. 4, 2022, which claims priority to and benefits of Chinese Patent Application No. 202111547204.3 filed on Dec. 16, 2021 and Chinese Patent Application No. 202123197264.5 filed on Dec. 16, 2021, the entire contents of each of which are incorporated herein by reference for all purposes. No new matter has been introduced.

FIELD

The present disclosure relates to the field of electrical fans, and more particularly, to an electrical fan and a cleaning device having the same.

BACKGROUND

In recent years, high-speed brushless motors have progressively evolved towards higher power, smaller size and lighter weight. Simultaneously, domestic and international demands for reduced noise levels in household appliances, such as vacuum cleaners, have increased. However, due to size constraints, the higher the power of the fan is, the greater the speed is. The increase in speed will results in higher noise levels, and the noise problem caused by speed is yet to be solved.

SUMMARY

The present disclosure aims to at least partially address one of the technical problems in the existing technology. To this end, the present disclosure provides a fan and a cleaning device with same, which can reduce the noise of the fan and reduce the noise impact caused by the increase in speed.

According to an embodiment of the first aspect of the present disclosure, a fan includes: a housing assembly; a fan cover mounted on the housing assembly, the fan cover fitting with the housing assembly to form an accommodating cavity; a wind wheel arranged in the accommodating cavity, the wind wheel fitting with a side wall of the accommodating cavity to define an air inlet channel; and a first diffuser arranged in the accommodating cavity and including a plurality of first fan blades and a mounting hub, the mounting hub, the plurality of first fan blades and the side wall of the accommodating cavity fit to define a first diffusing channel, the air inlet channel and the first diffusing channel are communicated in sequence, the plurality of first fan blades are arranged on an outer edge of the mounting hub, along an airflow direction, each of the plurality of first fan blades has a front edge, the end of the front edge of the first fan blade connected to the mounting hub is a first end, the end of the front edge of the first fan blade away from the mounting hub is a second end, and the second end is closer to the air inlet channel than the first end along the axial direction of the mounting hub.

The fan according to the embodiment of the first aspect of the present disclosure has at least the following beneficial effects: when the wind wheel rotates, air enters the air inlet channel; along the axial direction of the mounting hub, the airflow transitions from the air inlet channel to the first diffusing channel by arranging the second end closer to the air inlet channel than the first end, and the airflow is in contact with the first fan blades earlier and enters the first diffusing channel more smoothly, thereby reducing the diffusion and impact loss of the airflow and reducing aerodynamic noise.

According to some embodiments of the present disclosure, the connection line between the first end and the second end is defined as a first connection line, and an included angle between the first connection line and a radial line of the mounting hub as a, which satisfies: 25°≤a≤70°.

According to some embodiments of the present disclosure, the wind wheel includes a plurality of second fan blades, and the width of each of the plurality of second fan blades gradually decreases along an axial direction of the wind wheel.

According to some embodiments of the present disclosure, the ratio of the maximum width of the second fan blade to the minimum width of the second fan blade is x, which satisfies: 1.3≤x≤2.1.

According to some embodiments of the present disclosure, the second fan blade has a clearance fit with the inner wall of the fan cover, and the distance between the second fan blade and the inner wall of the fan cover is d, which satisfies: 0.12≤d≤0.5 mm.

According to some embodiments of the present disclosure, the number of the second fan blades is z2, and the number of the first fan blades is z1, satisfying: z2<z1, and 7≤z2≤9.

According to some embodiments of the present disclosure, the housing assembly is further provided with a second diffuser, which includes an inner cylinder, an outer cylinder, and a plurality of third fan blades. The inner cylinder is docked with the mounting hub, the third fan blades are circumferentially distributed on the outer periphery of the inner cylinder, a second diffusing channel is defined among the inner cylinder, the outer cylinder and the third fan blades, and the air inlet channel, the first diffusing channel and the second diffusing channel are communicated in sequence.

According to some embodiments of the present disclosure, along the axial direction of the second diffuser, the distance between a tail end of each of the plurality of third fan blades and a tail end of the inner cylinder is H1, and the distance between the tail end of each of the plurality of third fan blades and a tail end of the outer cylinder is H2, satisfying: H2>H1.

According to some embodiments of the present disclosure, the number of the third fan blades is z3, the number of the first fan blades is z1, satisfying: z3>z1.

According to some embodiments of the present disclosure, along the axial direction of the first diffuser, the axial length of the air inlet channel is h1, the axial length of the first diffusing channel is h2, and the axial length of the second diffusing channel is h3, satisfying: h1>h2>h3.

According to an embodiment of the second aspect of the present disclosure, a cleaning device includes the fan according to the embodiment of the first aspect of the present disclosure.

The cleaning device according to the embodiment of the second aspect of the present disclosure has at least the following beneficial effects: when the wind wheel rotates, air enters the air inlet channel along the air inlet end of the fan cover; when the airflow transitions from the air inlet channel to the first diffusing channel, the airflow enters the first diffusing channel more smoothly after passing through the first fan blades, thereby reducing the diffusion and impact loss of airflow and reducing aerodynamic noise.

Additional aspects and advantages of the present disclosure will be partly provided in the descriptions below, and in part will be apparent from the description, or may be understood through the practice of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

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

FIG. 1 is a schematic diagram of a fan according to an embodiment of the first aspect of the present disclosure;

FIG. 2 is a partially enlarged schematic diagram of A in FIG. 1;

FIG. 3 is a schematic diagram of an airflow direction of the fan according to the embodiment of the first aspect of the present disclosure;

FIG. 4 is a schematic diagram of a first diffuser in the fan according to the embodiment of the first aspect of the present disclosure;

FIG. 5 is a cross-sectional view of the first diffuser in the fan according to the embodiment of the first aspect of the present disclosure;

FIG. 6 is a schematic diagram of a wind wheel in the fan according to the embodiment of the first aspect of the present disclosure;

FIG. 7 is a schematic diagram of fitting between the wind wheel and a fan cover in the fan according to the embodiment of the first aspect of the present disclosure;

FIG. 8 is a partially enlarged schematic diagram of B in FIG. 7; and

FIG. 9 is a schematic diagram of a second diffuser in the fan according to the embodiment of the first aspect of the present disclosure from an upward angle.

Reference numerals shown in the figures are described as follows:

    • air inlet channel 101, first diffusing channel 102, second diffusing channel 103, transition channel 104;
    • fan cover 200;
    • wind wheel 300, second fan blade 310, wheel hub 320, bottom plate 330;
    • first diffuser 400, arc surface 401, first fan blade 410, front edge 411 of first fan blade, trailing edge 412 of first fan blade, first root 413, first outer edge 414; and
    • second diffuser 500, third fan blade 510, outer cylinder 520, first contact portion 521, first positioning step 522, inner cylinder 530, boss 540.

DETAILED DESCRIPTION

Embodiments of the present disclosure are described in detail below, with examples of the embodiments illustrated in the accompanying drawings, the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and serve only to explain the present disclosure, and should not be construed as limitations of the present disclosure.

In the description of the present disclosure, it should be understood that, referring to orientation description, the instructed orientation or positional relationships, for example, “upper,” “lower,” “front,” “rear,” “left,” “right,” etc., are based on the orientation or positional relationships shown in the accompanying drawings, these terms are used merely for ease of description of the present disclosure and simplification for the description, rather than indicating or implying that the device or element referred to must have a specific orientation and be constructed and operated in a specific orientation, which, therefore, cannot be construed as limiting the present disclosure.

In the description of the present disclosure, “several” means one or more, “a plurality of” means two or more, “greater than,” “less than,” “over,” etc. are understood to exclude the original number, and “above,” “below,” “within,” etc. are understood to include the original number. If described, “first” and “second” are only for the purpose of distinguishing technical features, and not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence relationship of indicated technical features.

In the description of the present disclosure, unless specifically stated otherwise, words such as “arranging,” “mounting” and “connecting” should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present disclosure combined with the specific content of the technical solution.

Referring to FIGS. 1, 2 and 4, according to an embodiment of the first aspect of the present disclosure, the fan includes: a housing assembly; a fan cover 200 mounted on the housing assembly, the fan cover 200 fitting with the housing assembly to form an accommodating cavity; a wind wheel 300 rotatably mounted in the accommodating cavity, the wind wheel 300 fitting with a side wall of the accommodating cavity to define an air inlet channel, air being continuously introduced into the air inlet channel by means of the rotation of the wind wheel 300 and flowing out along the air inlet channel; and a first diffuser 400 arranged in the accommodating cavity and including a plurality of first fan blades 410 and a mounting hub 420. The first fan blades 410 are arranged on the outer peripheral surface of the mounting hub 420, the mounting hub 420 fits with the side wall of the accommodating cavity to define a first diffusing channel 102, the air inlet channel 101 and the first diffusing channel 102 are docked in sequence, the plurality of first fan blades 410 are arranged at intervals on the outer peripheral surface of the mounting hub 420, the first fan blades 410 are arranged downstream of the air inlet channel 101 along the direction of airflow in the accommodating cavity, and the front edges 411 of the first fan blades 410 are arranged to be inclined upward.

It can be understood that each first fan blade 410 has a front edge 411 and a trailing edge 412. The end of the front edge 411 of the first fan blade 410 connected to the mounting hub 420 is set as a first end, and the end of the front edge 411 of the first fan blade 410 away from the mounting hub 420 is set as a second end. Along the axial direction of the mounting hub 420, the second end is closer to the air inlet channel than the first end. The connection line between the first end and the second end is defined as a first connection line, and the included angle between the first connection line and a radial line of the mounting hub 420 is an included angle a of the first fan blades 410, satisfying: 25°≤a≤70°.

It can be understood that when the wind wheel 300 rotates, air enters the air inlet channel 101 under the guidance of the wind wheel 300, and the front edges 411 of the first fan blades 410 are inclined upward, that is, along the axial direction of the mounting hub 420, the second ends is closer to the air outlet of the air inlet channel than the first ends, so that the front edges 411 of the first fan blades 410 are closer to the air outlet end of the air inlet channel 101. When the airflow transitions from the air inlet channel 101 to the first diffusing channel 102, after being blown out from the air outlet end of the air inlet channel 101, the airflow is in contact with the first fan blades 410 more quickly and is supported by the first fan blades 410 to reduce the diffusion of the airflow, so that the airflow flows smoothly into the first diffusing channel 102 by following the first fan blades 410. As a result, the impact loss of the airflow can be reduced, aerodynamic noise can be reduced, and the efficiency of the fan at the same time can be improved.

It should be noted that by docking the first diffusing channel 102 with the air inlet channel 101, the airflow formed by the rotation of the wind wheel 300 can be more fully converted into static pressure energy, thereby improving the overall efficiency of the fan.

It can be understood that, referring to FIGS. 1 and 4, there are a plurality of first fan blades 410 arranged circumferentially along the outer edge of the first diffuser 400. The first fan blades 410 can pressurize the airflow from the air inlet channel 101 to increase the pressure of the airflow and convert the kinetic energy into the static pressure energy, and the kinetic energy of the airflow are fully converted into the pressure energy of gas, thereby reducing the kinetic energy loss caused by the impact of gas, and thus increasing the efficiency of the electric fan.

It can be understood that, referring to FIG. 4, along the radial direction of the first diffuser 400, the ends of the first fan blades 410 close to the outer circumferential surface of the mounting hub 420 are roots of the first fan blades 410; in other words, first roots 413, and the ends of the first fan blades 410 away from the outer peripheral surface of the mounting hub 420 are outer edges of the first fan blades 410, that is, first outer edges 414. The thickness of the first fan blades 410 gradually decreases from the first roots 413 to the first outer edges 414. When the thickness of the first roots 413 is large, the cross-sectional area of the airflow channel in a root area of the first fan blades 410 can be reduced, thereby reducing the flow separation of the airflow in the root area of the first fan blades 410. In the first diffusing channel 102, the airflow in the area of the first roots 413 is small, and the airflow in the area of the first outer edges 414 is large. The thickness of the first roots 413 to the first outer edges 414 of the first fan blades 410 gradually decreases, which can appropriately increase the flow area of the airflow in the direction away from the first diffuser 400, thereby reducing the flow loss of the airflow.

It can be understood that, referring to FIG. 4, along the flow direction of the airflow, the first fan blades 410 extend downward along the circumferential direction of the first diffuser 400, and the first fan blades 410 extend from the air inlet end of the first diffuser channel 102 to the air outlet end of the first diffusing channel 102 to enhance the guiding effect of the first fan blades 410, so that the airflow can flow along the first fan blades 410 in the first diffusing channel 102, and at the same time, a stroke of the airflow in the first diffusing channel 102 is extended, which allows the airflow to be guided by the first fan blades 410 during the flow process. As a result, the turbulence of the airflow can be reduced, aerodynamic noise can be reduced, and the efficiency of the first diffusing channel 102 can be improved.

It can be understood that the wind wheel 300 includes a wheel hub 320, a bottom plate 330, and a plurality of second fan blades 310. The wheel hub 320 is generally cylindrical, and a connecting portion 340 is arranged along the axial direction of the wheel hub 320. The connecting portion 340 is used to connect with an output shaft of a driving apparatus of the electric fan, and the driving device drives the wind wheel 300 to rotate through the rotation of the output shaft. Along the direction of the central axis of the wheel hub 320, the diameter of the outer peripheral surface gradually increases from one end to the other. The outer circumferential surface of the bottom plate 330 gradually narrows from back to front, and is roughly conical in shape. The central axis of the outer circumferential surface coincides with the central axis of the hub 320; that is, the bottom plate 330 and the hub 320 are coaxially arranged, the narrower end of the outer circumferential surface is the air inlet end, and the wider end of the outer circumferential surface is the air outlet end. The plurality of second fan blades 310 are evenly arranged on the outer peripheral surface; that is, the plurality of second fan blades 310 are arranged at equal intervals along the circumference of the outer peripheral surface. Since the outer peripheral surface is a cone which is narrow in the front and wide at the back, and the second fan blades 310 are provided on the outer peripheral surface, the front ends of the second fan blades 310 are relatively close to the central axis of the hub 320. The front ends of the second fan blades 310 are front edge portions, and the front edge portions of the second fan blades 310 are relatively far away from the central axis of the hub 320, while the rear ends of the second fan blades 310 are trailing edge portions, the trailing edge portions of the second fan blades 310 are twisted toward the rotation direction of the wind wheel 300, and the rear ends of the second fan blades 310 are twisted away from the rotation direction of the wind wheel 300.

It should be noted that the wind wheel 300 is a plastic part, while the existing wind wheel 300 is usually made of metal. The cost of the metal wind wheel 300 is relatively high, and the use of the plastic wind wheel 300 can effectively reduce production costs. The wind wheel 300 can be made of plastic, so that its structure needs to be adapted to the demoulding process in the injection molding process. The front edge portions and the trailing edge portions of the second fan blades are twisted in opposite directions, and a parting surface is located in the middle section of the second fan blades and perpendicular to the central axis of the hub 320, so that the front half and the rear half of the wind wheel 300 rotate in opposite directions and are demoulded. The twisted structures at the front and rear ends of the second fan blades enable smooth demoulding, and can effectively reduce the fluid loss of the wind wheel 300 and improve the working performance of the wind wheel 300.

In addition, the wheel hub 320, the bottom plate 330 and the second fan blades are integrally formed by injection molding, which not only ensures the structural and performance stability of the wind wheel 300, but also facilitates molding and simple manufacturing. As a result, the assembly efficiency of the wind wheel 300 can be significantly improved and the connection reliability of the wind wheel 300 can be ensured. Furthermore, the integrally formed structure has higher overall strength and stability, facilitates easier assembly, and prolongs the service life of the electrical fan.

It can be understood that, referring to FIGS. 2 and 5, the side wall of the first diffuser 400 is provided with an arc surface 401 at one end toward the wind wheel 300, and the arc surface 401 is located outside the side wall of the first diffuser 400 and is arranged between the first fan blades 410 and the air inlet channel 101. The arc surface 401 and the side wall of the accommodating cavity define a transition channel 104. After coming out of the air inlet channel 101, the airflow enters the transition channel 104 and subsequently passes through the transition channel 104 smoothly by contact with the arc surface 401, thereby reducing aerodynamic noise.

It can be understood that, referring to FIG. 6, along the flow direction of the airflow in an air duct, the width of the second fan blades 310 gradually decreases. The width of the second fan blades 310 located at the air inlet end of the air inlet channel is maximum, so that when the wind wheel 300 rotates, the contact area between the second fan blades 310 and the air is increased, making it easier for the second fan blades 310 to introduce air into the air inlet channel. When entering the air inlet channel, the gas has certain kinetic energy and moves along the second fan blades 310. The gas flows in the air inlet channel toward the air outlet end, and the flow speed of the gas gradually increases toward the air outlet end of the air inlet channel from the air inlet end of the air inlet channel. The width of the second fan blades 310 gradually decreases toward the air outlet end of the air inlet channel, thus reducing the resistance when the airflow leaves the air inlet channel, reducing the loss of airflow energy, and improving the efficiency of the air inlet channel. In addition, the width of the second fan blades 310 gradually decreases along the flow direction of the airflow, so that when the airflow flows in the air inlet channel, the friction and collision between the airflow and the second fan blades 310 are reduced, and the aerodynamic noise generated when the air flows is reduced, thus improving the user experience.

In addition, the ratio range of the maximum width of the second fan blades 310 to the minimum width of the second fan blades 310 is 1.3 to 2.1. For example, the ratio of the maximum width of the second fan blades 310 to the minimum width of the second fan blades 310 may be 1.3, 1.5, 1.8, 2.0, 2.1, etc., so as to reduce the impact of the second fan blades 310 in the air inlet channel on the air flowing out of the air inlet channel while increasing the contact area between the second fan blades 310 and the air, and meanwhile, to reduce aerodynamic noise, and improve the performance of the air inlet channel.

It can be understood that, referring to FIGS. 7 and 8, the second fan blades 310 have a clearance fit with the inner wall of the fan cover 200. The distance between the second fan blades 310 and the inner wall of the fan cover 200 is d, which satisfies: 0.12≤d≤0.5 mm, so as to reduce the gap between the second fan blades 310 and the inner wall of the fan cover 200 while ensuring that there is no contact between the second fan blades 310 and the inner wall of the fan cover 200, thus reducing the amount of air flowing away from the gap, and thereby improving the efficiency of the wind wheel 300.

It can be understood that the number of the first fan blades 410 is z1, the number of the second fan blades 310 is 22, and z1>22, that is, the number of the first fan blades 410 is greater than the number of the second fan blades 310. When the wind wheel 300 rotates, the air is divided into a plurality of airflows and sent to the first diffusing channel 102, when the number of the first fan blades 410 is greater than the number of the second fan blades 310, the plurality of airflows entering the first diffusing channel 102 will be further divided into more airflows, which will help to reduce the pulsation of the airflow and reduce noise.

It can be understood that, referring to FIG. 1, the housing assembly is further provided with a second diffuser 500, which includes third fan blades 410, an inner cylinder 530, and an outer cylinder 520. The inner cylinder 530 is docked with the first diffuser 400. The inner cylinder 530 and the mounting hub 420 are in clearance fit to achieve preliminary positioning there-between. Then, the mounting hub 420 and the inner cylinder 530 are fixedly connected by means of screws light fasteners to realize the assembly of the first diffuser 400 and the second diffuser 500. The end of the outer cylinder 520 close to the air inlet of the fan extends along the axial direction to form a first contact portion 521. The first contact portion 521 is an extension of the inner side of the side wall of the outer cylinder 520. Along the axial direction of the outer cylinder 520, the axial length of the first contact portion 521 is less than the axial length of the side wall body of the outer cylinder 520, that is, the thickness of the first contact portion 521 is less than the thickness of the side wall body of the outer cylinder 520, so that a first positioning step 522 is formed on the outer side of the outer cylinder 520. The fan cover 200 is generally in the shape of a circular truncated cone. By extending the first contact portion 521 into the fan cover 200 and making the first contact portion 521 in clearance fit to the inner wall of the fan cover 200, the fan cover 200 and the outer cylinder 520 are conveniently disassembled and mounted. In addition, when the first contact portion 521 extends into the fan cover 200 until the side wall of the fan cover 200 is in contact with the first positioning step 522, the fan cover 200 on the outer cylinder 520 is positioned at this time, which is convenient and time-saving for assembling.

In addition, referring to FIGS. 1 and 9, a second diffusing channel 103 is defined among the third fan blades 510, the inner cylinder 530 and the outer cylinder 520. The air inlet channel, the first diffusing channel 102 and the second diffusing channel are docked in sequence. A plurality of third fan blades 510 are arranged on the outside of the inner cylinder 530. The first fan blades, the third fan blades and the wind wheel 300 form at least a two-stage expansion structure, which can pressurize the airflow while also reducing the overall sound power of the fan and the blade frequency peak, so as to reduce the noise of the fan and promote the development of the fan in the direction of miniaturization and high power.

It can be understood that, referring to FIGS. 1 and 9, both ends of each third fan blade are connected to the outer wall of the inner cylinder 530 and the inner wall of the outer cylinder 520, respectively. The third fan blades 510 can provide support for the inner cylinder 530 and the mounting hub 420, thereby simplifying the installation structure of the electric fan, improving the integration level of the electric fan, and facilitating the miniaturization of the electric fan.

It can also be understood that, referring to FIG. 9, the plurality of third fan blades 510 are evenly distributed along the circumferential direction of the inner cylinder 530, thereby enhancing the aesthetic appearance of the second diffuser 500 as a whole and facilitating the airflow flowing evenly in the second diffusing channel 103 at the same time, and thereby improving the efficiency of the second diffuser 500.

In addition, referring to FIG. 1, along the axial direction of the second diffuser, the axial distance between the tail ends of the third fan blades 510 and the tail end of the inner cylinder 530 is H1, the axial distance between the tail ends of the third fan blades 510 and the tail end of the outer cylinder 50 is H2, and H2>H1, so that the airflow will not directly spread to the outside after flowing out from the trailing edges of the third fan blades 510. At the same time, a transition section is formed at the tail end of the second diffusing channel 103, the transition section receives the airflow flowing out from the air outlet end of the second diffuser channel 103, and guides the airflow into the atmosphere outside the side wall of the second diffuser 500, so as to serve the purpose of reducing pressure. In addition, the transition section increases the diffusion stroke of the gas flow at the outlet end of the second diffusing channel 103, and reduces the diffusion loss of the gas flow at the outlet end of the second diffusing channel 103, thereby reducing the aerodynamic noise here.

It can be understood that the number of the first fan blades z1, the number of the third fan blades z3, and z3>21, that is, the number of the third fan blades 510 is greater than the number of the first fan blades 410. When the number of the third fan blades 510 is greater than the number of the first fan blades 410, the airflow flowing out from the outlet end of the first diffusing channel 102 can be divided into a plurality of airflows, which is beneficial for reducing airflow pulsation and reducing noise, and at the same time, can further decelerate and expand the airflow in the second diffusing channel 103.

It can be understood that, referring to FIG. 3, along the axial direction of the first diffuser 400, the axial length of the air inlet channel is h1, the axial length of the first diffusing channel 102 is h2, and the axial length of the second diffusing channel 103 is h3, satisfying: h1≥h2≥h3, thus the axial structure of the fan is more compact, and meanwhile, the output efficiency of the fan and the gas flow efficiency are improved

It can be understood that the second diffuser 500 is provided with a plurality of bosses 540 in a protruding manner along the axial direction, and the plurality of bosses 540 fit to position a PCB. By inserting screws through positioning holes in the PCB and threading same with the bosses 540, the PCB is fixedly mounted into the housing assembly.

According to an embodiment of the second aspect of the present disclosure, the cleaning device includes the fan according to the embodiment of the first aspect of the present disclosure. When the wind wheel 300 rotates, the air enters the air inlet channel, and when the airflow transitions from the air inlet channel 101 to the first diffusing channel 102, after passing through the first fan blades 410, the airflow enters the diffusing channel 102 more smoothly, thereby reducing the diffusion and impact loss of air flow and reducing aerodynamic noise.

It is understood that the cleaning device may be a handheld vacuum cleaner, a bucket vacuum cleaner, a sweeping robot, or other types of cleaning devices. When the cleaning device is the handheld vacuum cleaner, it requires the electric fan to be small in size and high in power to meet the cleaning needs. While the motor maintains high power, the noise can be effectively reduced, and the troubles of the noise generated by the cleaning device on the user can be reduced, thereby improving the user experience.

The embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings, however, the present disclosure is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the purpose of the present disclosure.

Claims

1. A fan comprising:

a housing assembly;
a fan cover mounted on the housing assembly, wherein the fan cover is fitted with the housing assembly to form an accommodating cavity;
a wind wheel arranged in the accommodating cavity, wherein the wind wheel is fitted with a side wall of the accommodating cavity to define an air inlet channel; and
a first diffuser, arranged in the accommodating cavity and comprising a plurality of first fan blades and a mounting hub,
wherein the mounting hub, the plurality of first fan blades and the side wall of the accommodating cavity fit to define a first diffusing channel;
the air inlet channel and the first diffusing channel are communicated in sequence;
the plurality of first fan blades are arranged on an outer edge of the mounting hub, along an airflow direction; and
each of the plurality of first fan blades has a front edge, the end of the front edge of the first fan blade connected to the mounting hub is a first end, the end of the front edge of the first fan blade away from the mounting hub is a second end, and the second end is closer to the air inlet channel than the first end along an axial direction of the mounting hub.

2. The fan of claim 1, wherein a connection line between the first end and the second end is defined as a first connection line, and an included angle between the first connection line and a radial line of the mounting hub is defined as a, which satisfies: 25°≤a≤70°.

3. The fan of claim 1, wherein the wind wheel comprises a plurality of second fan blades, and a width of each of the plurality of second fan blades gradually decreases along an axial direction of the wind wheel.

4. The fan of claim 3, wherein a ratio of a maximum width of each second fan blade to a minimum width of the second fan blade is x, which satisfies: 1.3≤x≤2.1.

5. The fan of claim 3, wherein each second fan blade has a clearance fit with an inner wall of the fan cover, and a distance between the second fan blade and the inner wall of the fan cover is d, which satisfies: 0.12≤d≤0.5 mm.

6. The fan of claim 3, wherein the number of the plurality of second fan blades is z2, and the number of the plurality of first fan blades is z1, satisfying: z2<z1, and 7≤z2≤9.

7. The fan of claim 1, wherein:

the housing assembly is further provided with a second diffuser, the second diffuser comprising an inner cylinder, an outer cylinder, and a plurality of third fan blades;
the inner cylinder is docked with the mounting hub, the plurality of third fan blades are circumferentially distributed on the outer periphery of the inner cylinder, a second diffusing channel is defined among the inner cylinder, the outer cylinder and the plurality of third fan blades; and
the air inlet channel, the first diffusing channel and the second diffusing channel are communicated in sequence.

8. The fan of claim 7, wherein along an axial direction of the second diffuser, a distance between a tail end of each of the plurality of third fan blade and a tail end of the inner cylinder is H1, and a distance between the tail end of each of the plurality of third fan blades and a tail end of the outer cylinder is H2, satisfying: H2>H1.

9. The fan of claim 7, wherein the number of the third fan blades is z3, and the number of the first fan blades is z1, satisfying: z3>z1.

10. The fan of claim 7, wherein along an axial direction of the first diffuser, an axial length of the air inlet channel is h1, an axial length of the first diffusing channel is h2, and an axial length of the second diffusing channel is h3, satisfying: h1≥h2≥h3.

11. A cleaning device comprising the fan of claim 1.

Patent History
Publication number: 20240298852
Type: Application
Filed: May 16, 2024
Publication Date: Sep 12, 2024
Applicant: GUANGDONG WELLING MOTOR MANUFACTURING CO., LTD. (Foshan)
Inventor: Rong DING (Foshan)
Application Number: 18/666,187
Classifications
International Classification: A47L 5/22 (20060101); F04D 25/08 (20060101); F04D 29/44 (20060101); F04D 29/62 (20060101);