Electric fan and cleaning equipment

Abstract

The present invention discloses an electric blower and cleaning equipment, and relates to the technical field of electric blowers, wherein the electric blower comprises a hood, a moving impeller, a casing assembly, a stator and a motor. The moving impeller is arranged in the hood, and an air inlet channel is formed between the moving impeller and the hood, the moving impeller comprises a moving impeller body and an air inlet blade, and the maximum outer diameter of the moving impeller body is D1; ​​the casing assembly comprises an outer cylinder and a supporting structure, and the outer diameter of the outer cylinder is D2; the stator is connected to the supporting structure, and a first pressure diffusion channel is formed between the stator and the outer cylinder, and the stator comprises a support seat and a first pressure diffusion blade, and the outer diameter of the support seat is D3; wherein D2=(1.2-1.6)D1, D2=(1.15-1.6)D3. By limiting the relationship between the outer diameter D2 of the outer cylinder, the maximum outer diameter D1 of the moving impeller body, and the outer diameter D3 of the support seat, it is ensured that the electric blower can achieve power maximization while meeting the small size requirement, and greatly improve the upper limit of power that can be achieved by the small size electric blower.

Description

Technical Field

[0001] The present invention relates to the technical field of electric blowers, and in particular to an electric blower and a cleaning device. Background Art

[0002] With the development of vacuum cleaners and other related household cleaning equipment, electric fans, as the core power components of products, are gradually developing in the direction of small size, light weight and high power. In the prior art, when electric fans meet the requirements of small size and light weight, their power will also be affected to a certain extent. Similarly, when electric fans meet certain power requirements, their size will also increase accordingly. Therefore, it is also necessary to optimize the structure of electric fans to solve the above problems. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an electric fan which can meet the requirements of small size and greatly improve the upper limit of power that the electric fan can achieve.

[0004] The present invention also provides a cleaning device having the electric blower.

[0005] According to an embodiment of the first aspect of the present invention, the electric blower comprises: a wind hood; an impeller, which is arranged in the wind hood and forms an air inlet channel with the wind hood, the impeller comprises an impeller body and air inlet blades arranged on the periphery of the impeller body, and the maximum outer edge diameter of the impeller body is D1; ​​a casing assembly, which comprises an outer cylinder and a supporting structure arranged in the outer cylinder, the outer cylinder is connected to the wind hood, and the outer diameter of the outer cylinder is D2; a stator, which is connected to the supporting structure and is located at one end of the supporting structure close to the impeller, a first pressure diffuser channel is formed between the stator and the outer cylinder, the first pressure diffuser channel is connected to the air inlet channel, the stator comprises a support seat and a first pressure diffuser blade arranged on the periphery of the support seat, and the outer diameter of the support seat is D3; a motor, which is used to drive the impeller to rotate; wherein D2=(1.2-1.6)D1, D2=(1.15-1.6)D3.

[0006] The electric fan according to the embodiment of the present invention has at least the following beneficial effects: the motor drives the impeller to rotate and form an airflow, and the airflow enters the first pressure diffusion channel from the air inlet channel for pressurization and then flows out. The electric fan of this technical solution defines the relationship between the outer diameter D2 of the outer cylinder, the maximum outer edge diameter D1 of the impeller body, and the outer diameter D3 of the support seat: D2 = (1.2-1.6) D1, D2 = (1.15-1.6) D3. When the outer diameter of the housing assembly is constant and the pressure diffusion effect of the electric fan is taken into account, the size of the impeller and the support seat can be enlarged, thereby increasing the air intake of the impeller, increasing the speed of the motor, and thus greatly increasing the power of the electric fan, ensuring that the electric fan can maximize the power while meeting the small size requirement, so that the electric fan with an outer diameter of less than 45mm can reach the power requirement of 450W, realizing the miniaturization and lightweight of the electric fan, and greatly improving the upper power limit that can be achieved by a small-sized electric fan.

[0007] According to some embodiments of the present invention, the support structure includes an inner cylinder and a mounting hub disposed in the inner cylinder, a second pressure diffuser channel is formed between the inner cylinder and the outer cylinder, the second pressure diffuser channel is connected to the air outlet end of the first pressure diffuser channel, a second pressure diffuser blade is provided between the inner cylinder and the outer cylinder, and the stator is mounted on the mounting hub.

[0008] According to some embodiments of the present invention, the mounting hub includes a bearing mounting seat and a connecting structure, the connecting structure is arranged between the bearing mounting seat and the inner cylinder, the bearing mounting seat is provided with at least one first sealing step, and the first sealing step is sealed with the inner wall of the support seat.

[0009] According to some embodiments of the present invention, the connection structure includes a plurality of connecting ribs spaced circumferentially along the bearing mounting seat, at least two of the connecting ribs are provided with a first connecting hole, the support seat is provided with at least two second connecting holes, and the first connecting hole and the second connecting hole are fixed by fasteners.

[0010] According to some embodiments of the present invention, the support seat has a first mating surface extending axially and a second mating surface extending radially at a position where it seals with the first sealing step, and the first sealing step has a first wall surface and a second wall surface that are connected and form an angle, the first wall surface abuts against the first mating surface, and the second wall surface abuts against the second mating surface, and the angle is greater than or equal to 90°.

[0011] 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 provided at one end of the inner cylinder away from the stator impeller, and the notch groove connects the stator accommodating cavity and the second diffuser channel.

[0012] According to some embodiments of the present invention, the inner cylinder is provided with a second sealing step, and the second sealing step is sealingly matched with the inner peripheral wall of the support seat.

[0013] According to some embodiments of the present invention, the support seat is provided with a transition section at the air inlet end of the first pressure diffuser channel, and the transition section is used to guide the airflow from the air inlet channel to the first pressure diffuser channel.

[0014] According to some embodiments of the present invention, the outer contour line of the transition section is arc-shaped.

[0015] According to some embodiments of the present invention, the angle between a straight line connecting two ends of the outer contour line of the transition section and a horizontal line is 30°-65°.

[0016] According to some embodiments of the present invention, along the axial direction of the impeller, the distance between the outer contour line of the transition section at one end close to the air outlet end of the air outlet channel and the maximum outer edge of the impeller body is 0.5 mm-1 mm.

[0017] According to some embodiments of the present invention, the number of the second diffuser blades is greater than the number of the first diffuser blades.

[0018] According to some embodiments of the present invention, the second diffuser blade includes a first blade structure and a second blade structure, and along the airflow direction of the second diffuser channel, the second blade structure includes a main body and a thickened portion in sequence, and the connection between the thickened portion and the main body is located at a position of 0.5-0.8 times the chord length of the second blade structure, and the end of the second blade structure away from the inner cylinder is the outer edge, and the thickness of the outer edge of the main body gradually increases along the airflow direction at a position of 0.1-0.3 times the chord length of the second blade structure, and the thickness of the outer edge of the thickened portion remains unchanged along the airflow direction; the first blade structure is arranged between adjacent second blade structures.

[0019] According to some embodiments of the present 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.

[0020] According to some embodiments of the present invention, the casing assembly is provided with an electric control board at one end away from the wind hood, the maximum axial distance between the wind hood and the electric control board is H, the maximum input power of the electric fan is P, and the maximum power density of the electric fan is σ, σ=P / (3.14*(D2 / 2)2*H), and σ is greater than or equal to 0.0045W / mm3.

[0021] The cleaning device according to the second embodiment of the present invention comprises the electric blower described in the above embodiment.

[0022] The cleaning device according to the embodiment of the present invention has at least the following beneficial effects:

[0023] The electric blower of the first embodiment is adopted. The electric blower drives the impeller to rotate and form an airflow through a motor. The airflow enters the first pressure diffusion channel from the air inlet channel and is pressurized before flowing out. The electric blower defines the relationship between the outer diameter D2 of the outer cylinder, the maximum outer edge diameter D1 of the impeller body, and the outer diameter D3 of the support seat: D2 = (1.2-1.6) D1, D2 = (1.15-1.6) D3. When the outer diameter of the casing assembly is constant and the pressure diffusion effect of the electric blower is taken into account, the size of the impeller and the support seat can be enlarged, thereby increasing the air intake of the impeller, increasing the speed of the motor, and thus greatly increasing the power of the electric blower, ensuring that the electric blower can maximize the power while meeting the small size requirement, so that the electric blower with an outer diameter of less than 45mm can reach the power requirement of 450W, greatly improving the upper limit of the power that can be achieved by small-sized electric blowers, and facilitating the miniaturization and lightweighting of cleaning equipment.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 A cross-sectional view of an electric blower at one angle according to an embodiment of the present invention;

[0027] Figure 2 A cross-sectional view of an electric blower according to an embodiment of the present invention from another angle;

[0028] Figure 3 An exploded schematic diagram of a casing assembly and a stator wheel according to an embodiment of the present invention;

[0029] Figure 4 A schematic structural diagram of a moving impeller according to an embodiment of the present invention;

[0030] Figure 5A schematic structural diagram of a housing assembly at one angle according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic structural diagram of a housing assembly without an outer cylinder according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic structural diagram of a housing assembly from another angle according to an embodiment of the present invention.

[0033] Figure Number:

[0034] Wind cover 100; air inlet channel 110; third sealing step 120;

[0035] Impeller 200; impeller body 210; air inlet blades 220;

[0036] Stator impeller 300; first diffuser passage 310; first diffuser blade 330;

[0037] Support seat 320; first sealing step 321; first wall surface 3211; second wall surface 3212; second connecting hole 322; transition section 323;

[0038] Housing assembly 400; outer cylinder 410; support arm 412; first threaded hole 4121; fourth sealing step 411; second diffuser channel 440;

[0039] The second diffuser blade 450; the first blade structure 451; the second blade structure 452; the arc surface 4521; the boss 453; the second threaded hole 4531; the positioning column 4532;

[0040] Inner cylinder 420; second sealing step 421; stator accommodating cavity 422; notch groove 423; heat dissipation channel 424;

[0041] Mounting hub 430; bearing mounting seat 431; bearing mounting chamber 4311; connecting rib 432; first connecting hole 4321;

[0042] Stator assembly 500;

[0043] Rotor assembly 600; rotating shaft 610; bearing 620;

[0044] Electric control board 700; first communication hole 710; DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein 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 are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0048] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0049] like Figure 1 As shown, the present invention provides an electric blower, which can be used in cleaning equipment such as vacuum cleaners. As the core functional component of cleaning equipment such as vacuum cleaners, the performance of the electric blower directly determines the quality of cleaning equipment such as vacuum cleaners. Especially for portable cleaning equipment such as handheld vacuum cleaners or sweeping robots, cleaning equipment has gradually developed in the direction of lightweight and portability, and its requirements for small size, high power and light weight of electric blowers have become more stringent.

[0050] At present, the electric blowers with an outer diameter of less than 45mm on the market cannot reach a power of 450W. Based on this, the electric blower in the embodiment of the present invention optimizes the internal structure to meet the small size requirements while greatly improving the power of the electric blower, ensuring that the electric blower with an outer diameter of less than 45mm can reach a power of 450W, and ensuring that the maximum power density σ of the electric blower is not less than 0.0045W / mm 3 .

[0051] Specifically, see Figure 1 and Figure 2 The electric fan provided in the embodiment of the present invention includes a fan housing 100, a moving impeller 200, a housing assembly 400, a fixed impeller 300 and a motor. The moving impeller 200 is installed in the fan housing 100 and defines an air inlet channel 110 with the fan housing 100. The motor is used to drive the moving impeller 200 to rotate to form an airflow. After the airflow enters the air inlet channel 110, the kinetic energy of the airflow increases. Figure 4The impeller 200 includes an impeller body 210 and an air inlet blade 220 arranged on the periphery of the impeller body 210. The impeller body 210 is provided with a mounting groove or a mounting hole. The motor is used to extend into the mounting groove or the mounting hole of the impeller body 210 to be connected with the impeller body 210 in a transmission manner, thereby driving the impeller 200 to rotate as a whole to form an airflow. Cleaning equipment such as vacuum cleaners can suck foreign objects such as dust and garbage on the ground or other medium surfaces into the filter bag or other processing structure of the cleaning equipment under the negative pressure of the electric fan, thereby completing the work of sucking in foreign objects such as dust. Among them, 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.

[0052] See also Figures 1 to 3 The housing assembly 400 includes an outer cylinder 410 and a support structure (not shown in the figure) disposed inside the outer cylinder 410. The outer cylinder 410 is connected to the wind cover 100, and the outer diameter of the outer cylinder 410 is D2. The stator 300 is connected to the support structure, and the stator 300 is disposed at one end of the support structure close to the impeller 200, and the support structure plays a role in supporting the stator 300. A first diffuser channel 310 is defined between the stator 300 and the outer cylinder 410, and the air inlet end of the first diffuser channel 310 is connected to the air outlet end of the air inlet channel 110, so that the air flow flows from the air inlet channel 110 to the first diffuser channel 310. After the airflow flows into the first pressure diffuser channel 310 from the air inlet channel 110, the first pressure diffuser channel 310 converts the kinetic energy of the airflow into pressure energy, thereby achieving a pressure diffuser effect, thereby increasing the pressure of the airflow, thereby allowing the airflow flowing out from the air outlet end of the first pressure diffuser channel 310 to blow farther, thereby increasing the air outlet intensity and efficiency of the electric fan.

[0053] It should be noted that an axial channel is reserved between the support structure and the outer cylinder 410, and the airflow can be blown out through the channel after coming out of the first diffuser channel 310 to achieve a wind outlet effect. It is understandable that the support structure can be arranged inside the outer cylinder 410 by nesting, welding, or connecting with a connector, or can be integrally formed with the outer cylinder 410, and no specific limitation is made here.

[0054] See also Figure 3, the fixed impeller 300 includes a support seat 320 and a first diffuser blade 330, and the first diffuser blade 330 is arranged at intervals on the outer periphery of the support seat 320, and the outer diameter of the support seat 320 is D3. It can be understood that the support seat 320 has an inner peripheral wall and an inner wall arranged in the inner peripheral wall. Among them, the inner peripheral wall is cylindrical, the inner wall is arranged in the cylindrical inner peripheral wall, and a through hole is provided at the center position. The first diffuser blade 330 is arranged on the wall surface of the inner peripheral wall and is arranged at intervals along the circumferential direction of the inner peripheral wall. Among them, D2 = (1.2-1.6) D1, D2 = (1.15-1.6) D3, when the outer diameter D2 of the outer cylinder 410, that is, the outer diameter of the casing assembly 400, is constant, and while taking into account the diffusion effect of the electric fan, the size of the impeller 200 and the support seat 320 can be made as large as possible. Specifically, when the maximum outer diameter D1 of the impeller body 210 is set to D2 / (1.2-1.6), the overall size of the impeller 200 is also increased accordingly. Compared with the impeller 200 in the existing electric blower with the same outer diameter specification, the size of the impeller 200 is increased, thereby increasing the air intake when the impeller 200 rotates. When the outer diameter D3 of the support seat 320 is set to D2 / (1.15-1.6), the inner cavity of the support seat 320 for accommodating the motor is also increased accordingly. Compared with the motor accommodating cavity in the existing electric blower with the same outer diameter specification, the size of the inner cavity of the support seat 320 for accommodating the motor is increased, so that the stator assembly 500 of the motor can be made as large as possible, thereby increasing the output power of the motor, so that the motor can increase the speed of the impeller and increase the air intake per unit time.

[0055] In short, when the outer diameter of the electric blower is constant, by limiting the relationship between the outer diameter D2 of the outer cylinder 410, the maximum outer diameter D1 of the impeller body 210, and the outer diameter D3 of the support seat 320, the size of the impeller 200 and the support seat 320 can be made as large as possible while taking into account the pressure diffusion effect of the electric blower, thereby increasing the air intake of the impeller 200 and the speed of the impeller 200 driven by the motor, thereby greatly increasing the air intake of the electric blower. While ensuring that the electric blower meets the small size requirement, that is, while keeping the outer diameter of the electric blower unchanged, the power can be maximized, so that the electric blower with an outer diameter of less than 45mm can meet the power requirement of 450W, which is conducive to the miniaturization and lightweight of cleaning equipment such as vacuum cleaners.

[0056] See also Figures 1 to 3 as well as Figure 5In some embodiments, the support structure includes an inner cylinder 420 and a mounting hub 430. An installation space is formed inside the inner cylinder 420. The mounting hub 430 is disposed inside the inner cylinder 420, that is, in the installation space. The stator 300 is disposed on the mounting hub 430, and the mounting hub 430 plays a role in supporting and fixing the stator 300. A second diffuser channel 440 is defined between the inner cylinder 420 and the outer cylinder 410, that is, a reserved channel as described above is formed. The air inlet end of the second diffuser channel 440 is connected to the air outlet end of the first diffuser channel 310, so that the air flow can flow from the first diffuser channel 310 to the second diffuser channel 440, and then flow out from the second diffuser channel 440.

[0057] A second diffuser blade 450 is provided between the inner cylinder 420 and the outer cylinder 410. The second diffuser blade 450 is located in the second diffuser channel 440. After the airflow flows out of the first diffuser channel 310, it continues to enter the second diffuser channel 440. The airflow continues to be pressurized under the action of the second diffuser blade 450, further enhancing the airflow intensity. The second diffuser blade 450 can be fixed on the outer wall surface of the inner cylinder 420, or fixed on the inner wall surface of the outer cylinder 410, or fixed between the outer wall surface of the inner cylinder 420 and the inner wall surface of the outer cylinder 410 at the same time, and no specific limitation is made here.

[0058] Further, see Figure 5 The mounting hub 430 includes a connection structure (not shown) and a bearing mounting seat 431. The connection structure is disposed between the bearing mounting seat 431 and the inner cylinder 420. The connection structure is used to connect with the stator impeller 300 to fix and support the stator impeller 300. It is understandable that the connection structure and the stator impeller 300 can be fixed by threaded connection, clamping, or by nesting a column and a clamping groove.

[0059] Continue to see Figure 1 , Figure 2 , Figure 3 and Figure 5, a plurality of first sealing steps 321 are provided on the peripheral wall of the bearing mounting seat 431, and the number of the first sealing steps 321 can be set to 1, 2 or more than 2. The bearing mounting seat 431 passes through the through hole formed by the inner wall of the support seat 320, and is sealed with the inner wall of the support seat 320 through the first sealing step 321 to prevent the airflow from flowing out of the air outlet end of the air inlet channel 110 and then flowing into the interior of the support seat 320, thereby reducing the loss of the airflow, ensuring the air outlet intensity of the airflow, and effectively ensuring the working efficiency of the electric fan. It can be understood that the number of the first sealing steps 321 can be set according to the actual installation requirements. When the number of the first sealing steps 321 is set to multiple, the multiple first sealing steps 321 are distributed in sequence along the axial direction. Similarly, the mating surface of the inner wall of the support seat 320 is also set accordingly according to the number and shape size of the first sealing steps 321 to achieve a sealed fit.

[0060] Specifically, see Figures 1 to 3 The support seat 320 has a first mating surface and a second mating surface at a position where it is sealed with the first sealing step 321, wherein the first mating surface extends in the axial direction and the second mating surface extends in the radial direction. The first sealing step 321 has a first wall surface 3211 and a second wall surface 3212, wherein the first wall surface 3211 and the second wall surface 3212 are connected and form an angle, that is, there is a certain angle between the first wall surface 3211 and the second wall surface 3212, and the angle is not less than 90°. In other words, the angle between the first wall surface 3211 and the second wall surface 3212 is greater than or equal to 90°. The first wall surface 3211 abuts against the first mating surface, thereby realizing the axial sealing of the support seat 320 and the first sealing step 321; the second wall surface 3212 abuts against the second mating surface, thereby realizing the radial sealing of the support seat 320 and the first sealing step 321.

[0061] Among them, the "abutment" in this embodiment can be understood as the first wall surface 3211 and the first mating surface are in contact and can at least partially fit each other, and the second wall surface 3212 and the second mating surface are in contact and can at least partially fit each other, so as to achieve the effect of sealing in both axial and radial directions, and ensure the sealing performance when the support seat 320 and the first sealing step 321 are matched. In addition, setting the angle formed between the first wall surface 3211 and the second wall surface 3212 to be greater than or equal to 90° is more convenient for demoulding, convenient production, and better sealing effect.

[0062] Likewise, see Figure 1 , Figure 2 , Figure 3 and Figure 5The inner cylinder 420 is provided with a second sealing step 421, and the second sealing step 421 and the support seat 320 are sealed together. In other words, the second sealing step 421 and the inner peripheral wall of the support seat 320 are in contact with each other to prevent the airflow from entering the inner cylinder 420 through the matching part between the inner cylinder 420 and the second sealing step 421, thereby reducing the leakage of the airflow and ensuring the stability of the airflow and the pressurization effect. The dual setting of the first sealing step 321 and the second sealing step 421 can achieve the effect of preventing the airflow from leaking into the inner cylinder 420, and the sealing is stronger. When the airflow flows out from the outlet end of the second pressure diffuser channel 440, the air pressure of the airflow is more stable and the strength is higher, which is conducive to improving the working efficiency of the electric fan.

[0063] The mounting hub 430 is matched with the support seat 320 through the first sealing step 321 on the bearing mounting seat 431, and is also firmly connected to the support seat 320 through the connecting structure. The connecting structure can be in the form of multiple ribs arranged around the bearing mounting seat 431; or in the form of a sealing plate sleeved on the outside of the bearing mounting seat 431, that is, an annular sealing plate is provided between the bearing mounting seat 431 and the inner cylinder 420, the inner ring of the sealing plate is connected to the bearing mounting seat 431, and the outer ring of the sealing plate is connected to the inner cylinder 420; or in the form of multiple seats and ribs distributed at intervals, etc., which are not specifically limited here.

[0064] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 In some embodiments, the connection structure includes a plurality of connection ribs 432, which are circumferentially spaced around the bearing mounting seat 431. The number of the connection ribs 432 can be set according to actual needs. For example, the number of the connection ribs 432 can be 6-9, etc., and no specific limitation is made here. At least two connection ribs 432 are provided with a first connection hole 4321, and the support seat 320 is provided with a second connection hole 322. The number of the second connection holes 322 is consistent with the number of the first connection holes 4321. The first connection hole 4321 and the second connection hole 322 are fixed by fasteners to connect the support seat 320 and the connection ribs 432, so that the stator impeller 300 is installed on the inner cylinder 420, and the fixing work between the stator impeller 300 and the casing assembly 400 is realized.

[0065] In addition, the connection structure adopts a method of setting multiple connection ribs 432 at intervals, which can reduce the production material amount and production cost of the product while connecting the bearing mounting seat 431 and the inner cylinder 420. It can be understood that the number of the first connection hole 4321 and the second connection hole 322 can be set to 2 or 3 according to actual connection requirements, and no specific limitation is made here.

[0066] In some embodiments, three equally spaced connecting ribs 432 are all provided with a first connecting hole 4321, and the support seat 320 is provided with three equally spaced second connecting holes 322, and the positions of the first connecting holes 4321 and the second connecting holes 322 correspond to each other. Similarly, three fasteners are provided, and after the fasteners pass through the first connecting holes 4321 and the second connecting holes 322 in sequence, the support seat 320 and the connecting ribs 432 are connected to connect the stator impeller 300 and the housing assembly 400. The housing assembly 400 and the stator impeller 300 are connected and fixed at three positions, which can form a stable triangular relationship and make the connection more firm.

[0067] Furthermore, the number of connecting ribs 432 is a multiple of 3 to meet the connection requirements between the casing assembly 400 and the stator impeller 300, ensuring that the support seat 320 and the connecting ribs 432 can be connected through three equally spaced positions to meet the installation requirements of the stator impeller 300 and improve the convenience and stability of installation.

[0068] It can be understood that a bearing mounting chamber 4311 is formed in the bearing mounting seat 431, and the motor includes a stator assembly 500 and a rotor assembly 600, the stator assembly 500 is mounted on the housing assembly 400, and the stator assembly 500 is located at one end of the air outlet end close to the second diffuser channel 440. The stator assembly 500 and the housing assembly 400 are completely or partially staggered in the radial direction of the outer cylinder 410. The rotor assembly 600 includes a rotating shaft 610 and a bearing 620, and the bearing 620 is installed in the bearing mounting chamber 4311. The first end of the rotating shaft 610 cooperates with the stator assembly 500, and the second end of the rotating shaft 610 passes through the bearing 620 and is connected to the impeller 200 to drive the impeller 200 to rotate and form an airflow.

[0069] That is, after the rotating shaft 610 passes through the bearing 620, the first end of the rotating shaft 610 cooperates with the stator assembly 500, and the second end of the rotating shaft 610 extends into the impeller body 210 to be connected to the impeller 200. Among them, the bearing 620 can play a role in supporting the rotating shaft 610, ensuring that the rotating shaft 610 can quickly drive the impeller 200 to rotate under the action of the stator assembly 500 to form an airflow and achieve wind discharge.

[0070] In the radial direction of the outer cylinder 410, when the stator assembly 500 and the housing assembly 400 are completely offset, the size of the electric fan will increase accordingly. Figure 1 and Figure 2The inner cylinder 420 has a stator accommodating cavity 422 for accommodating the stator assembly formed therein, and the stator assembly 500 is connected to the housing assembly 400 and at least partially extends into the stator accommodating cavity 422. That is, after the stator assembly 500 is connected to the housing assembly 400, the stator assembly 500 partially overlaps with the inner cylinder 420 in the radial direction, so as to shorten the axial distance between the end of the stator assembly 500 away from the impeller 200 and the end of the housing assembly 400 away from the impeller 200, thereby reducing the overall axial size of the electric fan, greatly reducing the size of the electric fan, and achieving a smaller size setting requirement under the same motor power.

[0071] See also Figure 1 , Figure 2 and Figure 7 The rotating shaft 610 cooperates with the stator assembly 500 and rotates at a high speed under the action of the stator assembly 500. The inner cylinder 420 is provided with a notch groove 423 at the end away from the stator impeller 300. It can be understood that the notch groove 423 is formed after a part of the wall surface of the inner cylinder 420 is cut off at the end away from the stator impeller 300. The stator accommodating cavity 422 is connected with the second pressure diffuser channel 440 through the notch groove 423, so that the stator accommodating cavity 422, the notch groove 423 and the second pressure diffuser channel 440 are connected to each other to form a heat dissipation channel 424 of the motor.

[0072] When the motor is working, heat will be generated inside the rotating shaft 610 and the stator assembly 500, and heating will occur. Since the stator accommodating cavity 422, the notch groove 423 and the second pressure diffusion channel 440 are connected in sequence to form a heat dissipation channel 424, the heat generated by the stator assembly 500 and the rotating shaft 610 can be dissipated through the heat dissipation channel 424, and the heat is rapidly diffused by radiation heat dissipation and conduction heat dissipation, thereby taking away the heat generated when the motor is working, and rapid heat dissipation and temperature reduction can be achieved, thereby effectively reducing the temperature of the stator assembly 500 and the rotating shaft 610, ensuring the stability and safety of the electric fan when working, and improving the service life of the motor.

[0073] It is understandable that the number of the notch slots 423 can be set to one, two, three or more than three according to actual needs. When there are two notch slots 423, the notch slots 423 can be symmetrically arranged so that the hot air flows out of the stator accommodating cavity 422 from the two notch slots 423 respectively, achieving uniform heat dissipation; when there are three or more notch slots 423, the notch slots 423 can be evenly spaced and distributed at one end of the inner cylinder 420 away from the stator impeller 300, which is conducive to uniform heat dissipation and better heat dissipation effect.

[0074] When the rotating shaft 610 drives the impeller 200 to rotate, the airflow flows along the air inlet channel 110 and the first diffuser channel 310 in sequence. Figure 1 and Figure 2In some embodiments, the support base 320 is provided with a transition section 323, which is located at one end of the support base 320 close to the air inlet end of the first diffuser channel 310. The transition section 323 is used to guide the airflow from the air inlet channel 110 to flow into the first diffuser channel 310, so that the airflow flows from the air inlet channel 110 to the first diffuser channel 310, which can minimize the kinetic energy loss of the airflow when it enters the first diffuser channel 310 from the air inlet channel 110, and the air outlet efficiency is higher.

[0075] It is understandable that the transition section 323 may be in a cone shape, a dish shape, or a structure formed by combining the cone shape and the dish shape, that is, the outer contour line of the transition section 323 may be in an inclined straight line shape, an arc shape, or formed by connecting a plurality of inclined straight lines and / or a plurality of arcs. Figures 1 to 3 In some embodiments, the outer contour line of the transition section 323 is arc-shaped, that is, the transition section 323 is a disc-shaped structure, which can achieve a smooth transition and has a better diversion effect.

[0076] Furthermore, the outer contour line of the transition section 323 has a first end and a second end, and the first end is axially higher than the second end. In other words, in the axial direction, the first end is closer to the impeller 200 than the second end. The angle between the straight line where the two ends of the outer contour line of the transition section 323 are connected and the horizontal line is 30°-65°, that is, the angle between the line connecting the first end and the second end of the outer contour line of the transition section 323 and the horizontal line is 30°-65°. When the airflow flows from the impeller 200 to the fixed impeller 300, that is, in the process of flowing from the first diffuser channel 310 to the second diffuser channel 440, the airflow is converted from a high-speed and low-pressure state to a low-speed and high-pressure state. Setting the angle between the line connecting the first end and the second end of the outer contour line of the transition section 323 and the horizontal line to 30°-65° has a good transition effect, ensures the diffusion effect, and meets the diffusion requirements when the airflow enters the second diffuser channel 440 from the first diffuser channel 310. Among them, the horizontal line can be understood as when the electric fan is placed as shown in the attached Figure 1 In the state shown in , the horizontal line is parallel to the radial direction of the inner cylinder 420.

[0077] Furthermore, along the axial direction of the impeller 200, the distance between the outer contour line of the transition section 323 at one end close to the outlet end of the air outlet channel and the maximum outer edge of the impeller body 210 is 0.5mm-1mm. This distance can ensure that the airflow flows directly to the outer contour of the transition section 323 after passing through the maximum outer edge of the impeller body 210, and then flows into the first diffuser channel 310 from the outlet end of the air inlet channel 110, so as to achieve a better transition effect and avoid that part of the airflow leaks into the gap formed between the support seat 320 and the impeller 200 when the distance is too large, causing airflow loss, thereby affecting the air outlet efficiency. At the same time, it can avoid the inconvenience of installation caused by the distance being too small. By setting the distance to 0.5mm-1mm, a better installation effect can be ensured, the installation is convenient, and the air outlet efficiency of the electric fan can be ensured.

[0078] After the airflow enters the first diffuser channel 310 for pressurization, it continues to enter the second diffuser channel 440 for secondary pressurization. In some embodiments, the number of the second diffuser blades 450 is greater than the number of the first diffuser blades 330. The second diffuser blades 450 can separate the airflow flowing out of the first diffuser channel 310 into multiple parts, thereby reducing the pressure pulsation of the airflow, facilitating the stability of the airflow, having the effect of decelerating and pressurizing, and helping to reduce noise.

[0079] The shape, thickness, and setting angle of the first diffuser blade 330 in the first diffuser channel 310 and the second diffuser blade 450 in the second diffuser channel 440 can be set according to actual needs. Figure 6 The second diffuser blade 450 includes a first blade structure 451 and a second blade structure 452. Along the airflow direction of the second diffuser channel 440, the second blade structure 452 includes a main body and a thickened portion in sequence. The thickness of the thickened portion is greater than that of the main body, and the connection between the thickened portion and the main body is located at a position of 0.5-0.8 times the chord length of the second blade structure 452.

[0080] The end of the second blade structure 452 away from the inner cylinder 420 is the outer edge, that is, the end of the second blade structure 452 close to the outer cylinder 410 is the outer edge. The thickness of the outer edge of the main body gradually increases along the airflow direction at a position 0.1-0.3 times the chord length away from the second blade structure 452, and the thickness of the outer edge of the thickened portion remains unchanged along the airflow direction.

[0081] In other words, the second blade structure 452 has a circumferentially protruding arc surface 4521, the arc surface 4521 has a leading edge at one end close to the air inlet end of the second diffuser channel 440, and the arc surface 4521 has a trailing edge at one end close to the air outlet end of the second diffuser channel 440, and the line connecting the leading edge and the trailing edge on the arc surface 4521 forms a chord length. The thickness of the second blade structure 452 in the circumferential direction gradually increases from a position of 0.1-0.3 times the chord length from the leading edge to a position of 0.2-0.5 times the chord length from the trailing edge, and the thickness of the second blade structure 452 in the circumferential direction remains unchanged from a position of 0.2-0.5 times the chord length from 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 structure 452 gradually increases along the airflow direction and then remains unchanged, so that the flow area of ​​the airflow gradually decreases and then remains unchanged, thereby achieving the pressurization effect of the second diffuser blade 450 on the airflow. At the same time, since the second blade structure 452 arranged in this way can form a thicker structure at the trailing edge, it is convenient to punch holes at the trailing edge of the second blade structure 452 to install the stator assembly 500, thereby achieving the installation of the stator assembly 500 while ensuring the airflow diffusion effect.

[0082] Furthermore, the minimum thickness of the outer edge of the second blade structure 452 is 0.1-0.3 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 0.1-0.3 times the maximum thickness of the first blade structure 451 in the circumferential direction, which can achieve a stable supercharging effect. It should be noted that the maximum thickness of the outer edge of the second blade structure 452 should be able to meet the requirements of punching. In addition, the minimum thickness of the outer edge of the second blade structure 452 can be set to about 0.4mm-0.5mm to avoid the phenomenon that the outer edge of the second blade structure 452 is too thin, resulting in defective products, thereby reducing the defective rate of product opening.

[0083] For further information, see Figure 1 , Figure 2 , Figure 6 and Figure 7The electric fan further includes an electric control board 700 and at least two first threaded fasteners. The electric control board 700 is connected to one end of the outer cylinder 410 away from the wind shield 100. The outer cylinder 410 has at least two support arms 412 extending toward one end close to the electric control board 700. The support arms 412 extend toward one 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 arms 412 are provided with first threaded holes 4121, which are arranged along the axial direction of the outer cylinder 410. The electric control board 700 is provided with at least two first connecting holes 710, which are arranged along the axial direction of the outer cylinder 410, and the number and position of the first connecting holes 710 correspond to the number and position of the first threaded holes 4121. The first threaded fastener passes through the corresponding connecting hole and then extends into the first threaded hole 4121 to connect the electric control board 700 and the support arm 412 , thereby fixing the electric control board 700 and the housing assembly 400 .

[0084] In some embodiments, the electric fan includes three first threaded fasteners, and the outer cylinder 410 extends to one end close to the electric control board 700 with three support arms 412. Similarly, the electric control board 700 is provided with three first connecting holes 710, and the outer cylinder 410 and the electric control board 700 are fixed after being correspondingly penetrated by the first threaded fasteners. More specifically, the three support arms 412 are evenly spaced at one end of the outer cylinder 410 close to the electric control board 700, and the three first connecting holes 710 are evenly spaced at the electric control board 700, and correspond one to one with the first threaded holes 4121 on the support arms 412. The housing assembly 400 and the electric control board 700 are connected and fixed at three positions, which can form a stable triangular relationship and make the connection more firm.

[0085] Further, see Figure 7 The electric fan also includes at least two second threaded fasteners, the stator assembly 500 is provided with at least two positioning grooves and at least two second connecting holes, the second diffuser blade 450 is provided with at least two bosses 453 on the side close to the electric control board 700, and the boss 453 is provided with a second threaded hole 4531 and a positioning column 4532. Among them, the second connecting hole and the second threaded hole 4531 are both arranged along the axial direction of the outer cylinder 410. The positioning column 4532 cooperates with the positioning groove to achieve positioning. The second threaded fastener passes through the second connecting hole and then extends into the second threaded hole 4531 to connect the stator assembly 500 and the boss 453, thereby realizing the connection between the stator assembly 500 and the housing assembly 400.

[0086] In some embodiments, the electric fan includes three second threaded fasteners, the stator assembly 500 is provided with three positioning grooves and three second communication holes, and the second diffuser blade 450 is provided with three bosses 453 on a side close to the electric control board 700. The housing assembly 400 and the stator assembly 500 are connected and fixed at three positions to form a stable triangular relationship, and the connection is more secure.

[0087] Furthermore, the number of the second diffuser blades 450 is a multiple of 3, so that the casing assembly 400 and the electric control board 700 and the casing assembly 400 and the stator assembly 500 can be connected through three connection positions respectively, which facilitates installation and fixing work.

[0088] The housing assembly 400 is connected to the air hood 100 via the outer cylinder 410. The air hood 100 and the outer cylinder 410 can be connected by nesting, welding or sealing. Figure 1 and Figure 2 The wind hood 100 is provided with a third sealing step 120 at one end close to the outer cylinder 410, and the outer cylinder 410 is provided with a fourth sealing step 411 at one end close to the wind hood 100. The third sealing step 120 and the fourth sealing step 411 are sealed together to improve the sealing performance of the device, and at the same time, can achieve rapid positioning and installation.

[0089] The electric fan in the embodiment of the present invention can meet the small size requirement by optimizing the internal structure, and at the same time can greatly improve the power of the electric fan, ensuring that the maximum power density σ of the electric fan is not less than 0.0045W / mm 3 , meeting the power requirement of the electric fan. Wherein, σ=P / (3.14*(D2 / 2)2*H), it should be noted that H is the maximum axial distance between the wind hood 100 and the electric control board 700, that is, in the axial direction, the distance between the end of the wind hood 100 away from the electric control board 700 and the end of the electric control board 700 away from the wind hood 100 is H. D2 / 2 is half of the outer diameter D2 of the outer cylinder 410. In addition, P is the maximum input power of the electric fan. Since the maximum input power P is the specification value of the electric fan, and the maximum input power P of the electric fan will be marked on the nameplate of the product, it will not be further explained here.

[0090] In the embodiment of the present embodiment, a cleaning device is also provided. The cleaning device includes the electric fan described in the above embodiment. The impeller 200 is driven by the motor in the electric fan to rotate and form an airflow. The airflow enters the first pressure diffuser channel 310 from the air inlet channel 110 and is pressurized before flowing out. During this period, the cleaning device forms a negative pressure under the action of the electric fan, and sucks dust and other objects on the floor or other medium surface to be cleaned into the cleaning device through the suction port of the cleaning device to perform cleaning work. The electric fan limits the relationship between the outer diameter D2 of the outer cylinder 410, the maximum outer edge diameter D1 of the impeller body 210, and the outer diameter D3 of the support seat 320, that is, D2 = (1.2-1.6) D1, D2 = (1.15-1.6) D3, ensuring that the electric fan can maximize the power while meeting the small size requirements, so that the electric fan with an outer diameter of less than 45mm can reach the power requirement of 450W, greatly improving the upper limit of the power that can be achieved by the small size electric fan, which is conducive to the miniaturization and lightweight of the cleaning equipment.

[0091] The embodiments of the present invention are described in detail above 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 scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An electric fan, characterized in that: include: Wind shield; An impeller is disposed in the wind cover and forms an air inlet passage with the wind cover. The impeller comprises an impeller body and air inlet blades disposed on the periphery of the impeller body. The maximum outer edge diameter of the impeller body is D1. A casing assembly, comprising an outer cylinder and a supporting structure disposed in the outer cylinder, wherein the outer cylinder is connected to the wind shield, and the outer diameter of the outer cylinder is D2; a fixed impeller connected to the support structure and located at one end of the support structure close to the impeller, a first pressure diffuser channel being formed between the fixed impeller and the outer cylinder, the first pressure diffuser channel being communicated with the air inlet channel, the fixed impeller comprising a support seat and a first pressure diffuser blade disposed on the outer periphery of the support seat, and the outer diameter of the support seat being D3; A motor, used for driving the impeller to rotate; Wherein, D2=(1.2-1.6)D1, D2=(1.15-1.6)D3, so that the electric fan with an outer diameter of less than 45mm can meet the power requirement of 450W; the supporting structure includes an inner cylinder and a mounting hub arranged in the inner cylinder, a second pressure diffuser channel is formed between the inner cylinder and the outer cylinder, the second pressure diffuser channel is connected to the air outlet end of the first pressure diffuser channel, a second pressure diffuser blade is arranged between the inner cylinder and the outer cylinder, and the stator impeller is mounted on the mounting hub; The second diffuser blade includes a first blade structure and a second blade structure. Along the airflow direction of the second diffuser channel, the second blade structure includes a main body and a thickened portion in sequence. The connection between the thickened portion and the main body is located at a position of 0.5-0.8 times the chord length of the second blade structure. The end of the second blade structure away from the inner cylinder is the outer edge. The thickness of the outer edge of the main body gradually increases along the airflow direction at a position of 0.1-0.3 times the chord length of the second blade structure, and the thickness of the outer edge of the thickened portion remains unchanged along the airflow direction. The first blade structure is arranged between adjacent second blade structures.

2. The electric blower according to claim 1, characterized in that: The mounting hub comprises a bearing mounting seat and a connecting structure, wherein the connecting structure is arranged between the bearing mounting seat and the inner cylinder, and the bearing mounting seat is provided with at least one first sealing step, and the first sealing step is sealingly matched with the inner wall of the support seat.

3. The electric fan according to claim 2, characterized in that: The connection structure includes a plurality of connection ribs spaced apart along the circumference of the bearing mounting seat, at least two of the connection ribs are provided with a first connection hole, the support seat is provided with at least two second connection holes, and the first connection hole and the second connection hole are fixed by fasteners.

4. The electric blower according to claim 2, characterized in that: The support seat has a first mating surface extending axially and a second mating surface extending radially at a position where it seals with the first sealing step. The first sealing step has a first wall surface and a second wall surface that are connected and form an angle. The first wall surface abuts the first mating surface, and the second wall surface abuts the second mating surface. The angle is greater than or equal to 90°.

5. The electric blower according to claim 1, characterized in that: A stator accommodating cavity is formed in the inner cylinder, and the motor includes a stator assembly, which is connected to the casing assembly and at least partially extends into the stator accommodating cavity. A notch groove is provided at one end of the inner cylinder away from the stator impeller, and the notch groove connects the stator accommodating cavity and the second diffuser channel.

6. The electric blower according to claim 1, characterized in that: The inner cylinder is provided with a second sealing step, and the second sealing step is sealingly matched with the inner peripheral wall of the support seat.

7. The electric blower according to claim 1, characterized in that: The support seat is provided with a transition section at the air inlet end of the first pressure diffuser channel, and the transition section is used to guide the airflow from the air inlet channel to the first pressure diffuser channel.

8. The electric blower according to claim 7, characterized in that: The outer contour line of the transition section is arc-shaped.

9. The electric blower according to claim 8, characterized in that: The angle between the straight line connecting the two ends of the outer contour line of the transition section and the horizontal line is 30°-65°.

10. The electric blower according to claim 8, characterized in that: Along the axial direction of the impeller, the distance between the outer contour line of the transition section at one end close to the air outlet end of the air outlet channel and the maximum outer edge of the impeller body is 0.5 mm-1 mm.

11. The electric blower according to claim 1, characterized in that: The number of the second diffuser blades is greater than the number of the first diffuser blades.

12. The electric blower according to claim 1, characterized in that: 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.

13. The electric blower according to claim 1 or 12, characterized in that: The second blade structure has an arc-shaped surface convex along the circumferential direction, the arc-shaped surface has a leading edge at one end close to the air inlet end of the second diffuser channel, and the arc-shaped surface has a trailing edge at one end close to the air outlet end of the second diffuser channel, and a line connecting the leading edge and the trailing edge on the arc-shaped surface forms a chord length; A hole for mounting the stator assembly is provided at the trailing edge of the second blade structure.

14. The electric blower according to claim 1, characterized in that: The housing assembly is provided with an electric control board at one end away from the wind shield. The maximum distance between the wind shield and the electric control board 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 σ, σ=P / (3.14*(D2 / 2) 2 *H), the σ is greater than or equal to 0.0045 W / mm 3 .

15. The electric blower according to claim 14, characterized in that: The outer cylinder has at least two support arms extending toward one end close to the electric control board, the support arms extend toward one side close to the inner cylinder and are connected to the thickened portion of the second blade structure, the support arms are provided with a first threaded hole, the first threaded hole is arranged along the axial direction of the outer cylinder, the electric control board is provided with at least two first connecting holes, the first connecting holes are arranged along the axial direction of the outer cylinder, and the number and positions of the first connecting holes correspond to the number and positions of the first threaded holes, the first threaded fastener passes through the first connecting hole and extends into the first threaded hole to connect the electric control board and the support arm.

16. The electric blower according to claim 14 or 15, characterized in that: The stator assembly is provided with at least two positioning grooves and at least two second connecting holes. The second diffuser blade is provided with at least two bosses on the side close to the electric control board. The bosses are provided with second threaded holes and positioning columns. The second connecting holes and the second threaded holes are both arranged along the axial direction of the outer cylinder. The positioning columns cooperate with the positioning grooves to achieve positioning. The second threaded fasteners pass through the second connecting holes and extend into the second threaded holes to connect the stator assembly and the bosses.

17. Cleaning equipment, characterized in that: An electric blower comprising the electric blower as claimed in any one of claims 1 to 16.

Images