CN113775546A

CN113775546A - Electric fan and cleaning equipment

Info

Publication number: CN113775546A
Application number: CN202111040388.4A
Authority: CN
Inventors: 丁荣
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2021-12-10

Abstract

The invention discloses an electric fan and cleaning equipment, and relates to the technical field of electric fans, wherein the electric fan comprises a fan cover, a movable impeller, a shell assembly, a fixed impeller and a motor. The movable impeller is arranged in the fan cover, an air inlet channel is formed between the movable impeller and the fan cover, the movable impeller comprises a movable impeller body and an air inlet blade, and the maximum outer edge diameter of the movable impeller body is D1; the shell assembly comprises an outer cylinder and a supporting structure, wherein the outer diameter of the outer cylinder is D2; the fixed impeller is connected with the supporting structure, a first diffusion channel is formed between the fixed impeller and the outer cylinder, the fixed impeller comprises a supporting seat and a first diffusion blade, and the outer diameter of the supporting seat is D3; wherein D2 is (1.2-1.6) D1, and D2 is (1.15-1.6) D3. Through the relation that the external diameter D2 of injecing outer barrel and the biggest outer fringe diameter D1 of movable vane wheel body and the external diameter of supporting seat are D3 three, ensure that electric fan when satisfying small-size requirement, can realize the maximize of power, improve the power upper limit that small-size electric fan can reach greatly.

Description

Electric fan and cleaning equipment

Technical Field

The invention relates to the technical field of electric fans, in particular to an electric fan and cleaning equipment.

Background

With the development of dust collectors and other related household cleaning devices, electric fans are gradually developing towards small size, light weight and high power as core power components of products. In the prior art, when the electric fan meets the requirements of small size and light weight, the power of the electric fan is also influenced to a certain extent. Similarly, when the electric fan meets a certain power requirement, the size of the electric fan is correspondingly increased, so that the structure of the electric fan needs to be optimized to solve the problem.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an electric fan which can meet the requirement of small size and greatly improve the upper power limit which can be reached by the electric fan.

The invention also provides cleaning equipment with the electric fan.

According to the embodiment of the first aspect of the invention, the electric fan comprises: a fan housing; the movable impeller is arranged in the fan cover, an air inlet channel is formed between the movable impeller and the fan cover, the movable impeller comprises a movable impeller body and air inlet blades arranged on the periphery of the movable impeller body, and the maximum outer edge diameter of the movable impeller body is D1; the casing assembly comprises an outer cylinder and a supporting structure arranged in the outer cylinder, the outer cylinder is connected with the fan cover, and the outer diameter of the outer cylinder is D2; the fixed impeller is connected with the supporting structure and is positioned at one end, close to the movable impeller, of the supporting structure, a first diffusion channel is formed between the fixed impeller and the outer barrel and is communicated with the air inlet channel, the fixed impeller comprises a supporting seat and first diffusion blades arranged on the periphery of the supporting seat, and the outer diameter of the supporting seat is D3; the motor is used for driving the movable impeller to rotate; wherein D2 is (1.2-1.6) D1, and D2 is (1.15-1.6) D3.

The electric fan provided by the embodiment of the invention at least has the following beneficial effects: the motor drives the movable impeller to rotate and form airflow, and the airflow enters the first diffusion channel from the air inlet channel to be pressurized and then flows out. The electric fan of the technical scheme is characterized in that the relation between the outer diameter D2 of the outer cylinder and the maximum outer edge diameter D1 of the movable impeller body and the outer diameter of the supporting seat is D3: d2 (1.2-1.6) D1, D2 (1.15-1.6) D3), under the certain circumstances of the external diameter size of casing subassembly, and when considering the fan diffusion effect, can make the size of movable impeller and supporting seat big, thereby increase the intake of movable impeller, improve the rotational speed of motor, and then greatly increased fan's power, ensure that the fan satisfies the small-size requirement simultaneously, can realize the maximize of power, make the fan that the external diameter is below 45mm can reach 450W's power requirement, realize the miniaturization and the lightweight of fan, greatly improve the power upper limit that the small-size fan can reach.

According to some embodiments of the present invention, the supporting structure includes an inner cylinder and a mounting hub disposed inside the inner cylinder, a second diffusion channel is formed between the inner cylinder and the outer cylinder, the second diffusion channel is communicated with an air outlet end of the first diffusion channel, a second diffusion blade is disposed between the inner cylinder and the outer cylinder, and the fixed impeller is mounted on the mounting hub.

According to some embodiments of the invention, the mounting hub comprises a bearing mount and a connecting structure, the connecting structure being provided between the bearing mount and the inner cylinder, the bearing mount being provided with at least one first sealing step, the first sealing step being in sealing engagement with an inner wall of the support seat.

According to some embodiments of the invention, the connecting structure includes a plurality of connecting ribs distributed at intervals along the circumferential direction of the bearing mounting seat, at least two of the connecting ribs are provided with first connecting holes, the supporting seat is provided with at least two second connecting holes, and the first connecting holes and the second connecting holes are fixed by fasteners.

According to some embodiments of the invention, the support seat has a first mating surface extending in an axial direction and a second mating surface extending in a radial direction at a position where the support seat is in sealing engagement with the first sealing step, the first sealing step has a first wall surface and a second wall surface which are connected and form an included angle, the first wall surface abuts against the first mating surface, the second wall surface abuts against the second mating surface, and the included angle is greater than or equal to 90 °.

According to some embodiments of the present invention, a stator accommodating cavity is formed in the inner cylinder, the motor includes a stator assembly, the stator assembly is connected to the casing assembly and at least partially extends into the stator accommodating cavity, and a notch groove is formed at an end of the inner cylinder far away from the fixed impeller and communicates the stator accommodating cavity and the second diffusion passage.

According to some embodiments of the invention, the inner cylinder is provided with a second sealing step, and the second sealing step is in sealing fit with the inner circumferential wall of the supporting seat.

According to some embodiments of the present invention, the supporting seat is provided with a transition section at an air inlet end of the first diffusion channel, and the transition section is used for guiding the airflow from the air inlet channel to the first diffusion channel.

According to some embodiments of the invention, the transition section has an outer contour that is curved.

According to some embodiments of the invention, a line connecting two ends of the outer contour line of the transition section forms an angle of 30-65 ° with the horizontal line.

According to some embodiments of the invention, along the axial direction of the movable impeller, the distance between one end of the outer contour line of the transition section close to the air outlet end of the air outlet channel and the maximum outer edge of the movable impeller body is 0.5mm-1 mm.

According to some embodiments of the invention, the number of the second diffuser vanes is greater than the number of the first diffuser vanes.

According to some embodiments of the present invention, the second diffuser vane comprises a first vane structure and a second vane structure, the second vane structure comprises a main body portion and a thickened portion in sequence along the airflow direction of the second diffuser channel, the junction of the thickened portion and the main body portion is located at a position of 0.5-0.8 times of the chord length of the second vane structure, one end of the second vane structure away from the inner cylinder body is an outer edge, the thickness of the outer edge of the main body portion gradually increases along the airflow direction at a position of 0.1-0.3 times of the chord length of the second vane structure, and the thickness of the outer edge of the thickened portion is constant along the airflow direction; the first blade structures are arranged between the adjacent second blade structures.

According to some embodiments of the invention, the minimum thickness of the outer edge of the second blade structure is 0.1-0.3 times the maximum thickness of the outer edge of the second blade structure.

According to some embodiments of the present invention, the casing assembly is provided with an electric control board at an end away from the fan housing, a maximum distance between the fan housing and the electric control board in an axial direction is H, a maximum input power of the electric fan is P, a maximum power density of the electric fan is σ, and σ is greater than or equal to 0.0045W/mm3, where P/(3.14 × D2/2)2 × H).

The cleaning device according to the second aspect of the embodiment of the invention comprises the electric fan described in the above embodiment.

The cleaning device provided by the embodiment of the invention has at least the following beneficial effects:

by adopting the electric fan in the embodiment of the first aspect, the electric fan drives the movable impeller to rotate through the motor and form airflow, and the airflow enters the first diffusion channel from the air inlet channel to be pressurized and then flows out. The electric fan is characterized in that the relation between the outer diameter D2 of the outer cylinder and the maximum outer edge diameter D1 of the movable impeller body and the outer diameter D3 of the supporting seat is defined as follows: d2 (1.2-1.6) D1, D2 (1.15-1.6) D3), under the certain circumstances of the external diameter size of casing subassembly, and when considering the fan diffusion effect, can make the size of movable impeller and supporting seat big, thereby increase the intake of movable impeller, improve the rotational speed of motor, and then greatly increased fan's power, ensure that the fan satisfies the small-size requirement simultaneously, can realize the maximize of power, make the fan that the external diameter is below 45mm can reach 450W's power requirement, greatly improve the power upper limit that the small-size fan can reach, do benefit to cleaning equipment's miniaturization and lightweight.

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 invention is further described with reference to the following figures and examples, in which:

FIG. 1 is an angled cross-sectional view of an electric blower in accordance with one embodiment of the present invention;

FIG. 2 is another angle cross-sectional view of an electric blower in accordance with an embodiment of the present invention;

FIG. 3 is an exploded view of the housing assembly and stator vane of one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a movable impeller according to an embodiment of the present invention;

FIG. 5 is an angled configuration of the housing assembly according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a housing assembly with an outer cylinder removed according to an embodiment of the present invention;

fig. 7 is a schematic view of another angle structure of the housing assembly according to an embodiment of the invention.

Reference numerals:

a fan housing 100; an air intake passage 110; a third sealing step 120;

the movable impeller 200; the impeller body 210; an air intake vane 220;

a fixed impeller 300; a first diffuser passage 310; a first diffuser vane 330;

a support base 320; a first sealing step 321; a first wall 3211; a second wall 3212; a second connection hole 322; a transition section 323;

a chassis assembly 400; an outer cylinder 410; a support arm 412; a first threaded hole 4121; a fourth sealing step 411; a second diffuser channel 440;

a second diffuser vane 450; a first blade structure 451; a second blade structure 452; arcuate surface 4521; a boss 453; a second threaded hole 4531; a positioning post 4532;

an inner cylinder 420; a second sealing step 421; a stator receiving cavity 422; a notched groove 423; heat dissipation channel 424;

a mounting hub 430; a bearing mount 431; a bearing mounting chamber 4311; a connecting rib 432; a first connection hole 4321;

a stator assembly 500;

a rotor assembly 600; a rotating shaft 610; a bearing 620;

an electronic control board 700; a first communication hole 710;

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.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

As shown in fig. 1, the present invention provides an electric blower that can be used in a cleaning apparatus such as a cleaner. The electric fan is used as a core functional component of cleaning equipment such as a dust collector, and the quality of the cleaning equipment such as the dust collector is directly determined by the performance of the electric fan. Especially for portable cleaning devices such as hand-held vacuum cleaners or sweeping robots, the cleaning devices have been gradually developed toward light weight and portability, and the requirements for small volume, high power and light weight of electric fans have become more severe.

At present, all electric fans with the outer diameter of less than 45mm on the market can not reach the power of 450WBased on the above, the electric fan in the embodiment of the invention can greatly improve the power of the electric fan by optimizing the internal structure while meeting the small-size requirement, ensure that the electric fan with the outer diameter of less than 45mm can reach the power of 450W, and ensure that the maximum power density sigma of the electric fan is not less than 0.0045W/mm³。

Specifically, referring to fig. 1 and 2, the electric blower provided in the embodiment of the present invention includes a wind shield 100, an impeller 200, a casing assembly 400, a stator vane 300, and a motor. The movable impeller 200 is installed in the wind shield 100, and defines the air inlet passage 110 with the wind shield 100. The motor is used for driving the movable impeller 200 to rotate so as to form an air flow, and after the air flow enters the air inlet channel 110, the kinetic energy of the air flow is increased. Referring to fig. 4, the movable impeller 200 includes a movable impeller body 210 and an air inlet blade 220 disposed at the periphery of the movable impeller body 210, the movable impeller body 210 is provided with a mounting groove or a mounting hole, and the motor is used for extending into the mounting groove or the mounting hole of the movable impeller body 210 to be in transmission connection with the movable impeller body 210, so as to drive the movable impeller 200 to integrally rotate to form an air flow. The cleaning equipment such as the dust collector can suck the dust, the garbage and other foreign matters on the ground or the surface of other media into the filter cloth bag or other processing structures of the cleaning equipment under the negative pressure action of the electric fan, and the work of sucking the dust and other foreign matters is completed. The maximum outer edge diameter of the impeller body 210 is D1, that is, the maximum distance of the outer contour line of the impeller body 210 in the radial direction is D1.

Referring to fig. 1 to 3, the cabinet assembly 400 includes an outer cylinder 410 and a support structure (not shown) disposed inside the outer cylinder 410, the outer cylinder 410 is connected to the wind cowl 100, and an outer diameter of the outer cylinder 410 is D2. The fixed impeller 300 is connected with a support structure, and the fixed impeller 300 is arranged at one end of the support structure close to the movable impeller 200, and the support structure plays a role in supporting the fixed impeller 300. The first diffuser passage 310 is defined between the fixed impeller 300 and the outer cylinder 410, and the air inlet end of the first diffuser passage 310 is communicated with the air outlet end of the air inlet passage 110, so that the air flow is communicated from the air inlet passage 110 to the first diffuser passage 310. After the air current flows into the first diffusion channel 310 from the air inlet channel 110, the first diffusion channel 310 converts the kinetic energy of the air current into air pressure energy, so that the diffusion effect is achieved, the pressure of the air current is increased, the air current flowing out from the air outlet end of the first diffusion channel 310 is further blown, and the air outlet intensity and the air outlet efficiency of the electric fan are increased.

It should be noted that an axial channel is reserved between the supporting structure and the outer cylinder 410, and after the air flow comes out from the first diffusion channel 310, the air flow can be blown out through the channel, so that the air outlet effect is achieved. It is understood that the supporting structure may be nested, welded or connected by a connector inside the outer cylinder 410, or may be integrally formed with the outer cylinder 410, which is not limited herein.

Referring to fig. 3, the fixed impeller 300 includes a support seat 320 and first diffuser blades 330, the first diffuser blades 330 are spaced apart from each other at the outer circumference of the support seat 320, and the outer diameter of the support seat 320 is D3. It will be appreciated that the support seat 320 has an inner peripheral wall and an inner wall disposed therein. The inner peripheral wall is cylindrical, the inner wall is arranged in the cylindrical inner peripheral wall, and a through hole is formed in the center of the inner peripheral wall. The first diffuser blades 330 are provided on the wall surface of the inner circumferential wall, and are arranged at intervals along the circumferential direction of the inner circumferential wall. Wherein D2 (D2) and D2 (D2) are (1.15-1.6) D1 and D3, respectively, and the sizes of the movable impeller 200 and the support base 320 can be increased as much as possible while taking into account the diffuser effect of the electric fan when the outer diameter D2 of the outer cylinder 410, that is, the outer diameter of the casing assembly 400, is constant. Specifically, when the maximum outer diameter D1 of the impeller body 210 is D2/(1.2-1.6), the size of the impeller 200 is increased, and the size of the impeller 200 is increased compared to the impeller 200 of the conventional electric fan having the same outer diameter, thereby increasing the amount of air supplied when the impeller 200 rotates. When the outer diameter of the supporting seat 320 is D3 and is set to be D2/(1.15-1.6), the inner cavity of the supporting seat 320 for accommodating the motor is correspondingly increased, and compared with the existing motor accommodating cavity in the electric fan with the same outer diameter specification, the size of the inner cavity of the supporting seat 320 for accommodating the motor is increased, so that the stator assembly 500 of the motor can be enlarged as much as possible, the output power of the motor is increased, the rotating speed of the movable impeller can be increased by the motor, and the air intake in unit time is increased.

In short, under the condition that the outer diameter of the electric fan is fixed, by limiting the relationship among the outer diameter D2 of the outer cylinder 410, the maximum outer edge diameter D1 of the movable impeller body 210 and the outer diameter D3 of the support seat 320, the sizes of the movable impeller 200 and the support seat 320 can be increased as much as possible while the diffusion effect of the electric fan is considered, the air inlet amount of the movable impeller 200 is increased, the rotating speed of the movable impeller 200 driven by the motor is increased, and the air flow suction amount of the electric fan is greatly increased. When ensuring that the electric fan satisfies the small-size requirement, also be keeping the external diameter size of electric fan unchangeable simultaneously, can realize the maximize of power for the electric fan that the external diameter is below 45mm can reach 450W's power requirement, does benefit to cleaning equipment's such as dust catcher miniaturization and lightweight.

Referring to fig. 1 to 3 and 5, in some embodiments, the support structure includes an inner cylinder 420 and a mounting hub 430, the inner cylinder 420 having a mounting space formed therein, and the mounting hub 430 being disposed inside the inner cylinder 420, i.e., in the mounting space. The fixed impeller 300 is disposed on the mounting hub 430, and the mounting hub 430 functions to support and fix the fixed impeller 300. A second diffusion channel 440 is defined between the inner cylinder 420 and the outer cylinder 410, that is, a reserved channel is formed as described above, and an air inlet end of the second diffusion channel 440 is communicated with an air outlet end of the first diffusion channel 310, so that the air flow can flow from the first diffusion channel 310 to the second diffusion channel 440 and then flow out from the second diffusion channel 440.

A second diffusion blade 450 is arranged between the inner cylinder body 420 and the outer cylinder body 410, the second diffusion blade 450 is located in the second diffusion channel 440, the airflow continuously enters the second diffusion channel 440 after flowing out of the first diffusion channel 310, and the airflow is continuously pressurized under the action of the second diffusion blade 450, so that the air outlet intensity of the airflow is further enhanced. The second diffusion vane 450 may be fixed to the outer wall surface of the inner cylinder 420, or the inner wall surface of the outer cylinder 410, or may be fixed between the outer wall surface of the inner cylinder 420 and the inner wall surface of the outer cylinder 410, which is not limited herein.

Further, referring to fig. 5, the mounting hub 430 includes a connection structure (not shown) disposed between the bearing mount 431 and the inner cylinder 420, and a bearing mount 431 for connecting with the fixed impeller 300 to fix and support the fixed impeller 300. It will be appreciated that the attachment structure and the stator 300 may be secured by a threaded connection, snap fit, or by nesting posts and slots.

With continued reference to fig. 1, 2, 3, and 5, the peripheral wall of the bearing mount 431 is provided with a plurality of first sealing steps 321, and the number of the first sealing steps 321 may be set to 1, 2, or more than 2. The bearing mounting seat 431 penetrates through a through hole formed in the inner wall of the supporting seat 320, and is in sealing fit with the inner wall of the supporting seat 320 through the first sealing step 321, so that the air flow is prevented from flowing into the inside of the supporting seat 320 after flowing out of the air outlet end of the air inlet channel 110, the loss of the air flow is reduced, the air outlet strength of the air flow is guaranteed, and the working efficiency of the electric fan is effectively guaranteed. It is understood that the number of the first sealing steps 321 may be set according to actual installation requirements, and when the number of the first sealing steps 321 is set to be plural, the plural first sealing steps 321 are distributed in sequence along the axial direction. Similarly, the matching surface of the inner wall of the supporting seat 320 is correspondingly arranged according to the number and shape size of the first sealing steps 321, so as to realize sealing matching.

Specifically, referring to fig. 1 to 3, the support seat 320 has a first mating surface and a second mating surface at a position where the first sealing step 321 is in sealing engagement, wherein the first mating surface extends along an axial direction, and the second mating surface extends along a radial direction. The first sealing step 321 has a first wall 3211 and a second wall 3212, and the first wall 3211 and the second wall 3212 are connected to form an included angle, that is, the first wall 3211 and the second wall 3212 form an included angle, which is not less than 90 °. In other words, the angle between the first wall 3211 and the second wall 3212 is greater than or equal to 90 °. The first wall surface 3211 abuts against the first mating surface, so that the support seat 320 and the first sealing step 321 are axially sealed; the second wall surface 3212 abuts against the second mating surface, so that the support seat 320 and the first sealing step 321 can be sealed in the radial direction.

In this embodiment, "abutting" may be understood as that the first wall surface 3211 makes contact with the first mating surface and can be at least partially attached to the structure, and the second wall surface 3212 makes contact with the second mating surface and can be at least partially attached to the structure, so as to achieve the effect of sealing in the axial direction and the radial direction, and ensure the sealing performance when the support seat 320 is mated with the first sealing step 321. In addition, an included angle formed between the first wall surface 3211 and the second wall surface 3212 is set to be greater than or equal to 90 degrees, so that demolding is facilitated, production is facilitated, and a sealing effect is better.

Similarly, referring to fig. 1, 2, 3 and 5, the inner cylinder 420 is provided with a second sealing step 421, and the second sealing step 421 is in sealing fit with the support seat 320, in other words, the second sealing step 421 is attached to the inner peripheral wall of the support seat 320, so that the air flow is prevented from entering the inner cylinder 420 through the fit position of the inner cylinder 420 and the second sealing step 421, thereby reducing the leakage of the air flow and ensuring the stability and the pressurization effect of the air flow. Through the dual arrangement of the first sealing step 321 and the second sealing step 421, the effect of preventing the air flow from leaking into the inner cylinder 420 can be achieved, and the sealing performance is stronger. When the air current flows out from the air outlet end of the second diffusion channel 440, the air pressure of the air current is more stable and the strength is higher, which is beneficial to improving the working efficiency of the electric fan.

The mounting hub 430 is coupled to the supporting seat 320 through the first sealing step 321 on the bearing mounting seat 431 and is also stably coupled to the supporting seat 320 through a coupling structure. The connection structure may take the form of a plurality of ribs disposed around the periphery of the bearing mount 431; a mode that the sealing plate is sleeved outside the bearing mounting seat 431 can also be adopted, namely, an annular sealing plate is arranged between the bearing mounting seat 431 and the inner cylinder 420, the inner ring of the sealing plate is connected with the bearing mounting seat 431, and the outer ring of the sealing plate is connected with the inner cylinder 420; and a plurality of seat bodies and rib bodies can be distributed at intervals, and the like, which is not limited in particular.

Referring to fig. 1, 2, 3 and 5, in some embodiments, the connection structure includes a plurality of connection ribs 432, the connection ribs 432 are circumferentially distributed at intervals around the bearing mount 431, and the number of the connection ribs 432 may be set according to actual requirements, for example, the number of the connection ribs 432 may be set to 6 to 9, and the like, which is not limited herein. At least two connecting ribs 432 are provided with first connecting holes 4321, the supporting base 320 is provided with second connecting holes 322, and the number of the second connecting holes 322 is consistent with that of the first connecting holes 4321. The first connection hole 4321 and the second connection hole 322 are fixed by a fastener to connect the support base 320 and the connection rib 432, so that the fixed impeller 300 is installed in the inner cylinder 420, and the fixed operation between the fixed impeller 300 and the casing assembly 400 is realized.

In addition, the connection structure adopts a mode that a plurality of connecting ribs 432 are arranged at intervals, so that the production material consumption of products can be reduced and the production cost can be reduced while the bearing mounting seat 431 and the inner cylinder 420 are connected. It is understood that the number of the first connection holes 4321 and the second connection holes 322 may be set to 2 or 3, etc. according to actual connection requirements, and is not particularly limited herein.

In some embodiments, the three equally spaced connection ribs 432 are provided with first connection holes 4321, the support base 320 is provided with three equally spaced second connection holes 322, and the positions of the first connection holes 4321 and the second connection holes 322 are in one-to-one correspondence. Similarly, three fasteners are provided, and the fasteners correspondingly pass through the first connection hole 4321 and the second connection hole 322 in sequence, and then connect the support base 320 and the connection rib 432 to connect the fixed impeller 300 and the casing assembly 400. The casing assembly 400 and the fixed impeller 300 are fixedly connected through three positions, so that a stable triangular relation can be formed, and the connection is firmer.

Further, the quantity of splice bar 432 is the multiple of 3 to satisfy the connection requirement between casing subassembly 400 and the fixed blade wheel 300, ensure to connect through three equidistant position between supporting seat 320 and the splice bar 432, satisfy the installation demand of fixed blade wheel 300, improve the convenience and the stability of installation.

It can be understood that the bearing mounting seat 431 has a bearing mounting chamber 4311 formed therein, the motor includes a stator assembly 500 and a rotor assembly 600, the stator assembly 500 is mounted on the casing assembly 400, and the stator assembly 500 is located at one end close to the air outlet end of the second diffuser passage 440. The stator assembly 500 is completely or partially misaligned with the casing assembly 400 in a radial direction of the outer cylinder 410. The rotor assembly 600 includes a rotation shaft 610 and a bearing 620, and the bearing 620 is installed in the bearing installation chamber 4311. A first end of the rotating shaft 610 is engaged with the stator assembly 500, and a second end of the rotating shaft 610 passes through the bearing 620 and then is connected to the impeller 200 to drive the impeller 200 to rotate, so as to form an air flow.

That is, after the rotating shaft 610 passes through the bearing 620, a first end of the rotating shaft 610 is engaged with the stator assembly 500, and a second end of the rotating shaft 610 extends into the moving impeller body 210 to be connected to the moving impeller 200. Wherein, bearing 620 can play the effect of supporting pivot 610, ensures that pivot 610 can drive movable vane wheel 200 fast under stator module 500's effect and rotate to form the air current, realize the air-out.

In the radial direction of the outer cylinder 410, when the stator assembly 500 is completely misaligned with the cabinet assembly 400, the size of the electric blower is increased accordingly. Further, referring to fig. 1 and 2, the inner cylinder 420 is internally formed with a stator receiving cavity 422 for receiving the stator assembly, and the stator assembly 500 is coupled to the casing assembly 400 and at least partially extends into the stator receiving cavity 422. That is, after the stator assembly 500 is connected to the casing assembly 400, the stator assembly 500 is partially overlapped with the inner cylinder 420 in the radial direction, so as to shorten the axial distance between the end of the stator assembly 500 far away from the movable impeller 200 and the end of the casing assembly 400 far away from the movable impeller 200, thereby reducing the overall axial dimension of the electric fan, greatly reducing the size of the electric fan, and meeting the setting requirement of a smaller size under the same motor power.

Referring to fig. 1, 2 and 7, the rotational shaft 610 is engaged with the stator assembly 500 and rotated at a high speed by the stator assembly 500. The inner cylinder 420 is provided with a notch groove 423 at one end far from the fixed impeller 300, and it can be understood that the notch groove 423 is formed after a partial wall surface is cut at one end far from the fixed impeller 300 of the inner cylinder 420. The stator accommodating chamber 422 is communicated with the second diffusion passage 440 through the notched groove 423, so that the stator accommodating chamber 422, the notched groove 423, and the second diffusion passage 440 are communicated with each other to form the heat dissipation passage 424 of the motor.

When the motor is in operation, heat is generated inside the rotating shaft 610 and the stator assembly 500, and heat is generated. Because the stator holds chamber 422, breach groove 423 and second diffusion passageway 440 between communicate formation heat dissipation channel 424 in proper order, the heat accessible heat dissipation channel 424 that stator module 500 and pivot 610 produced dispels the heat, the heat is through modes such as radiation heat dissipation and conduction heat dissipation rapid diffusion, thereby take away the heat that the motor during operation produced, can realize the cooling of dispelling the heat fast, thereby effectively reduce stator module 500 and pivot 610's temperature, guarantee stability and the security of electric fan during operation, the life of motor is improved.

It is understood that the number of the notch grooves 423 may be set to one, two, three, or more than three, etc. according to actual requirements. When the two notched grooves 423 are provided, the notched grooves 423 can be symmetrically arranged, so that hot air flows out of the two notched grooves 423 from the stator accommodating cavity 422 respectively, and uniform heat dissipation is realized; when the notch grooves 423 are three or more, the notch grooves 423 can be distributed at equal intervals at one end of the inner cylinder 420 far away from the fixed impeller 300, so that uniform heat dissipation is facilitated, and the heat dissipation effect is better.

When the rotating shaft 610 drives the movable impeller 200 to rotate, the airflow flows along the air inlet channel 110 and the first diffuser channel 310 in sequence. Referring to fig. 1 and 2, in some embodiments, the support base 320 is provided with a transition section 323, the transition section 323 is located at an end of the support base 320 near the air inlet end of the first diffuser passage 310, and the transition section 323 is used to guide the air flow from the air inlet passage 110 into the first diffuser passage 310, so that the air flow flows downstream from the air inlet passage 110 to the first diffuser passage 310, thereby minimizing the loss of kinetic energy when the air flow enters the first diffuser passage 310 from the air inlet passage 110, and improving the air outlet efficiency.

It is understood that the transition section 323 may have a tapered shape, a disc shape or a combination of tapered and disc shapes, that is, the outer contour of the transition section 323 may have a slanted straight line shape, an arc shape or a connection of a plurality of slanted straight lines and/or a plurality of arc lines. Referring to fig. 1 to 3, in some embodiments, the outer contour line of the transition section 323 is arc-shaped, that is, the transition section 323 has a dish-shaped structure, so that smooth transition can be achieved, and a good flow guiding effect is achieved.

Further, the outer contour line of the transition section 323 has a first end and a second end, the first end being axially higher than the second end, in other words, the first end is axially closer to the impeller 200 than the second end. The included angle between the straight line of the connecting line of the two ends of the outer contour line of the transition section 323 and the horizontal line is 30-65 degrees, namely the included angle between the connecting line of the first end and the second end of the outer contour line of the transition section 323 and the horizontal line is 30-65 degrees. When the airflow passes from the moving impeller 200 to the fixed impeller 300, i.e., passes from the first diffuser passage 310 to the second diffuser passage 440, the airflow is converted from a high-speed low-pressure state to a low-speed high-pressure state. The included angle between the connecting line of the first end and the second end of the outer contour line of the transition section 323 and the horizontal line is set to be 30-65 degrees, so that a good transition effect is achieved, the diffusion effect is ensured, and the diffusion requirement when the airflow enters the second diffusion channel 440 from the first diffusion channel 310 is met. Here, the horizontal line may be understood as being parallel to the radial direction of the inner cylinder 420 when the electric blower is placed in the state as shown in fig. 1.

Further, along the axial direction of the movable impeller 200, the distance between one end of the outer contour line of the transition section 323 close to the air outlet end of the air outlet channel and the maximum outer edge of the movable impeller body 210 is 0.5mm-1mm, which can ensure that the airflow directly flows to the outer contour of the transition section 323 after passing through the maximum outer edge of the movable impeller body 210, and then flows downstream into the first diffusion channel 310 from the air outlet end of the air inlet channel 110, thereby achieving a better transition effect, and avoiding that a part of the airflow leaks into the gap formed between the support base 320 and the movable impeller 200 when the distance is too large, thereby causing airflow loss and further affecting the air outlet efficiency. Meanwhile, the inconvenience in installation caused by the excessively small distance can be avoided. By setting the distance to be 0.5mm-1mm, better installation effect can be ensured, the installation is convenient, and the air outlet efficiency of the electric fan can be ensured.

After entering the first diffusion channel 310 for pressurization, the gas flow continues to enter the second diffusion channel 440 for secondary pressurization. In some embodiments, the number of the second diffuser blades 450 is greater than that of the first diffuser blades 330, and the second diffuser blades 450 may divide the airflow flowing out of the first diffuser passage 310 into a plurality of portions, so as to reduce pressure pulsation of the airflow, facilitate stability of the airflow, have an effect of deceleration and pressurization, and facilitate noise reduction.

The shape, thickness, and arrangement angle of the first diffuser blade 330 in the first diffuser passage 310 and the second diffuser blade 450 in the second diffuser passage 440 can be set according to actual requirements. Further, referring to fig. 6, second diffuser vane 450 includes a first vane structure 451 and a second vane structure 452, with the second vane structure 452 including, in sequence, a main portion and a thickened portion in the direction of gas flow in second diffuser passage 440. The thickness of the thickened portion is greater than the thickness of the main body portion, and the junction of the thickened portion and the main body portion is located at a position 0.5-0.8 times the chord length of the second blade structure 452.

The end of the second vane structure 452 away from the inner cylinder 420 is an outer edge, i.e., the end of the second vane structure 452 close to the outer cylinder 410 is an outer edge. The thickness of the outer edge of the main body portion gradually increases in the airflow direction at a position 0.1 to 0.3 times the chord length from the second blade structure 452, and the thickness of the outer edge of the thickened portion does not change in the airflow direction.

In other words, the second vane structure 452 has an arc-shaped surface 4521 protruding in the circumferential direction, the arc-shaped surface 4521 has a leading edge at an end close to the air inlet end of the second diffuser channel 440, the arc-shaped surface 4521 has a trailing edge at an end close to the air outlet end of the second diffuser channel 440, and a line connecting the leading edge and the trailing edge on the arc-shaped surface 4521 forms a chord length. The thickness of the second blade structure 452 in the circumferential direction gradually increases from a chord length position 0.1-0.3 times the leading edge to a chord length position 0.2-0.5 times the trailing edge, and the thickness of the second blade structure 452 in the circumferential direction remains constant from a chord length position 0.2-0.5 times the trailing edge to the trailing edge. The first blade structure 451 is arranged between two adjacent second blade structures 452, and the thickness of the second blade structures 452 is kept unchanged after gradually increasing along the airflow direction, so that the flow area of the airflow is kept unchanged after gradually decreasing, and the pressurizing effect of the second diffuser blades 450 on the airflow is realized. Meanwhile, the second blade structure 452 arranged in this way can form a thick structure at the tail edge, so that the holes can be punched at the tail edge of the second blade structure 452 to install the stator assembly 500, and the diffuser effect of the airflow is ensured while the stator assembly 500 is installed.

Further, the minimum thickness of the outer edge of the second blade structure 452 is 0.1 to 0.3 times the maximum thickness of the outer edge of the second blade structure 452, that is, the minimum thickness of the first blade structure 451 in the circumferential direction is 0.1 to 0.3 times the maximum thickness of the first blade structure 451 in the circumferential direction, and thus, a stable supercharging effect can be achieved. It should be noted that the maximum thickness of the outer edge of the second blade structure 452 is sufficient to allow for the perforation. In addition, the minimum thickness of the outer edge of the second blade structure 452 can be set to be about 0.4mm-0.5mm, so that the phenomenon that the product is poor due to the fact that the outer edge of the second blade structure 452 is too thin is avoided, and the die sinking defective rate of the product is reduced.

Further, referring to fig. 1, 2, 6 and 7, the electric blower further includes an electric control board 700 and at least two first threaded fasteners, and the electric control board 700 is connected to an end of the outer cylinder 410 away from the wind cover 100. At least two supporting arms 412 extend from the outer cylinder 410 to an end close to the electronic control board 700, and the supporting arms 412 extend to a side close to the inner cylinder 420 and are connected to the second blade structure 452, that is, connected to the thickened portion of the second blade structure 452. The support arm 412 is provided with a first screw hole 4121, and the first screw hole 4121 is provided along the axial direction of the outer cylinder 410. The electric control plate 700 is provided with at least two first communication holes 710, the first communication holes 710 are arranged along the axial direction of the outer cylinder 410, and the number and the positions of the first communication holes 710 correspond to the number and the positions of the first threaded holes 4121. The first threaded fastener correspondingly penetrates through the communication hole and then extends into the first threaded hole 4121 to connect the electronic control board 700 and the support arm 412, so that the electronic control board 700 and the chassis assembly 400 are fixed.

In some embodiments, the electric blower includes three first threaded fasteners, the outer cylinder 410 has three support arms 412 extending to an end close to the electric control board 700, similarly, the electric control board 700 has three first through holes 710, and the outer cylinder 410 and the electric control board 700 are fixed after being correspondingly penetrated through by the first threaded fasteners. More specifically, 3 supporting arms 412 are equidistantly distributed at one end of the outer cylinder 410 close to the electronic control board 700, and three first through holes 710 are equidistantly distributed on the electronic control board 700 and correspond to the first threaded holes 4121 on the supporting arms 412 one by one. The chassis assembly 400 and the electronic control board 700 are connected and fixed through three positions, so that a stable triangular relation can be formed, and the connection is firmer.

Further, referring to fig. 7, the electric blower further includes at least two second screw fasteners, the stator assembly 500 is provided with at least two positioning grooves and at least two second communication holes, the second diffuser blade 450 is provided with at least two bosses 453 at a side close to the electric control board 700, and the bosses 453 are provided with second screw holes 4531 and positioning posts 4532. Wherein, the second communication hole and the second screw hole 4531 are both disposed along the axial direction of the outer cylinder 410. The positioning column 4532 is matched with the positioning groove to realize positioning. The second screw fastener correspondingly passes through the second communication hole and then extends into the second screw hole 4531 to connect the stator assembly 500 and the boss 453, so that the stator assembly 500 and the housing assembly 400 are connected.

In some embodiments, the electric blower includes three second threaded fasteners, the stator assembly 500 is provided with three positioning slots and three second communication holes, and the second diffuser vane 450 is provided with three bosses 453 on a side adjacent to the electric control plate 700. The chassis assembly 400 and the stator assembly 500 are fixedly connected through three positions, so that a stable triangular relation can be formed, and the connection is firmer.

Furthermore, the number of the second diffuser blades 450 is a multiple of 3, which facilitates the connection between the casing assembly 400 and the electric control board 700 and between the casing assembly 400 and the stator assembly 500 through three connection positions, and facilitates the installation and fixing work.

The casing assembly 400 is connected to the wind shield 100 through the outer cylinder 410, and the wind shield 100 and the outer cylinder 410 may be connected by nesting, welding, or sealing. Further, referring to fig. 1 and 2, a third sealing step 120 is disposed at one end of the fan housing 100 close to the outer cylinder 410, a fourth sealing step 411 is disposed at one end of the outer cylinder 410 close to the fan housing 100, and the third sealing step 120 and the fourth sealing step 411 are in sealing fit, so that the sealing performance of the device is improved, and meanwhile, quick positioning and installation can be realized.

The electric fan in the embodiment of the invention can greatly improve the power of the electric fan while meeting the small-size requirement by optimizing the internal structure, and ensure that the maximum power density sigma of the electric fan is not less than 0.0045W/mm³And the power requirement of the electric fan is met. WhereinP/(3.14 ═ (D2/2)2 ×, it should be noted that H is the maximum distance between the wind shield 100 and the electronic control board 700 in the axial direction, that is, the distance between the end of the wind shield 100 away from the electronic control board 700 and the end of the electronic control board 700 away from the wind shield 100 in the axial direction is H. D2/2 is one-half of the outer diameter D2 of the outer cylinder 410. In addition, P is the maximum input power of the electric fan, and since the maximum input power P is the specification value of the electric fan and the maximum input power P of the electric fan is marked on the nameplate of the product, the description thereof is not expanded.

The embodiment of the present embodiment further provides a cleaning device, the cleaning device includes the electric blower described in the above embodiment, the motor in the electric blower drives the impeller 200 to rotate and form an airflow, and the airflow enters the first diffusion channel 310 from the air inlet channel 110 to be pressurized and then flows out. Meanwhile, the cleaning device forms negative pressure under the action of the electric fan, and dust and the like on the floor or other medium surfaces to be cleaned are sucked into the cleaning device through the suction port of the cleaning device so as to perform cleaning work. The electric blower fan is characterized in that the relation among the outer diameter D2 of the outer cylinder body 410, the maximum outer edge diameter D1 of the movable impeller body 210 and the outer diameter D3 of the supporting seat 320 is defined, namely: d2 (1.2-1.6) D1 and D2 (1.15-1.6) D3 ensure that the electric fan can realize the maximization of power while meeting the small-size requirement, so that the electric fan with the outer diameter of less than 45mm can meet the power requirement of 450W, the upper power limit which can be reached by the small-size electric fan is greatly improved, and the miniaturization and the light weight of cleaning equipment are facilitated.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. Electric fan, its characterized in that includes:

a fan housing;

the movable impeller is arranged in the fan cover, an air inlet channel is formed between the movable impeller and the fan cover, the movable impeller comprises a movable impeller body and air inlet blades arranged on the periphery of the movable impeller body, and the maximum outer edge diameter of the movable impeller body is D1;

the casing assembly comprises an outer cylinder and a supporting structure arranged in the outer cylinder, the outer cylinder is connected with the fan cover, and the outer diameter of the outer cylinder is D2;

the fixed impeller is connected with the supporting structure and is positioned at one end, close to the movable impeller, of the supporting structure, a first diffusion channel is formed between the fixed impeller and the outer barrel and is communicated with the air inlet channel, the fixed impeller comprises a supporting seat and first diffusion blades arranged on the periphery of the supporting seat, and the outer diameter of the supporting seat is D3;

the motor is used for driving the movable impeller to rotate;

wherein D2 is (1.2-1.6) D1, and D2 is (1.15-1.6) D3.

2. The electric fan of claim 1, wherein: the supporting structure comprises an inner barrel and an installation hub arranged in the inner barrel, a second diffusion channel is formed between the inner barrel and the outer barrel and communicated with an air outlet end of the first diffusion channel, second diffusion blades are arranged between the inner barrel and the outer barrel, and the fixed impeller is installed on the installation hub.

3. The electric fan of claim 2, wherein: the mounting hub comprises a bearing mounting seat and a connecting structure, the connecting structure is arranged between the bearing mounting seat and the inner barrel, the bearing mounting seat is provided with at least one first sealing step, and the first sealing step is in sealing fit with the inner wall of the supporting seat.

4. The electric fan of claim 3, wherein: the connection structure comprises a plurality of edges and at least two connection ribs distributed at intervals in the circumferential direction of the bearing mounting seat, the connection ribs are provided with first connection holes, the supporting seat is provided with at least two second connection holes, and the first connection holes and the second connection holes are fixedly penetrated through fasteners.

5. The electric fan of claim 3, wherein: the supporting seat is provided with a first matching surface extending along the axial direction and a second matching surface extending along the radial direction at the position matched with the first sealing step in a sealing mode, the first sealing step is provided with a first wall surface and a second wall surface which are connected and form an included angle, the first wall surface is abutted against the first matching surface, the second wall surface is abutted against the second matching surface, and the included angle is larger than or equal to 90 degrees.

6. The electric fan of claim 2, wherein: the inner cylinder is internally provided with a stator accommodating cavity, the motor comprises a stator assembly, the stator assembly is connected with the casing assembly and at least partially extends into the stator accommodating cavity, one end, far away from the fixed impeller, of the inner cylinder is provided with a notch groove, and the notch groove is communicated with the stator accommodating cavity and the second diffusion channel.

7. The electric fan of claim 2, wherein: the inner cylinder body is provided with a second sealing step, and the second sealing step is in sealing fit with the inner peripheral wall of the supporting seat.

8. The electric fan of claim 1, wherein: the supporting seat is provided with a transition section at the air inlet end of the first diffusion channel, and the transition section is used for guiding airflow to flow from the air inlet channel to the first diffusion channel.

9. The electric fan of claim 8, wherein: the outer contour line of the transition section is arc-shaped.

10. The electric fan of claim 9, wherein: the included angle between the straight line of the connecting line of the two ends of the outer contour line of the transition section and the horizontal line is 30-65 degrees.

11. The electric fan of claim 9, wherein: and along the axial direction of the movable impeller, the distance between one end of the outer contour line of the transition section, which is close to the air outlet end of the air outlet channel, and the maximum outer edge of the movable impeller body is 0.5-1 mm.

12. The electric fan of claim 2, wherein: the number of the second diffuser blades is greater than the number of the first diffuser blades.

13. The electric fan of claim 2, wherein: the second diffusion blade comprises a first blade structure and a second blade structure, the second blade structure sequentially comprises a main body part and a thickened part along the airflow direction of the second diffusion channel, the joint of the thickened part and the main body part is located at the position of 0.5-0.8 times of chord length of the second blade structure, one end, away from the inner cylinder body, of the second blade structure is an outer edge, the thickness of the outer edge of the main body part is gradually increased along the airflow direction at the position of 0.1-0.3 times of chord length of the second blade structure, and the thickness of the outer edge of the thickened part is unchanged along the airflow direction; the first blade structures are arranged between the adjacent second blade structures.

14. The electric fan of claim 13, wherein: the minimum thickness of the outer edge of the second blade structure is 0.1-0.3 times the maximum thickness of the outer edge of the second blade structure.

15. The electric fan of claim 1, wherein: the casing assembly is provided with an electric control plate at one end far away from the fan cover, the maximum distance between the fan cover and the electric control plate in the axial direction is H, the maximum input power of the electric fan is P, the maximum power density of the electric fan is sigma, and the sigma is P/(3.14X (D2/2)²H), said σ is greater than or equal to 0.0045W/mm³。

16. Cleaning apparatus, its characterized in that: comprising an electric fan according to any of claims 1 to 15.