Splash-proof fan and range hood

Abstract

The present invention relates to a splash-proof fan and a range hood, which can effectively prevent the cleaning medium from splashing out from the air inlet, ensuring the safety and hygiene of the range hood. The splash-proof fan includes a fan main body, a cleaning device and a baffle. The fan main body includes a volute and an impeller rotatably arranged in the volute; the cleaning device includes a cleaning medium supply member arranged relative to the volute, and the cleaning medium supply member is used for spraying the cleaning medium onto the current cleaning blade of the impeller to form a scouring flow on the current cleaning blade; the baffle extends from the volute into the air inlet cavity of the impeller to correspond to the inner edge of the current cleaning blade, and is used for blocking the scouring flow flowing out from the inner edge of the current cleaning blade.

Description

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on November 1, 2021, with the application number 202111284408.2 and the application title "Fan Cleaning Device and Range Hood for Range Hoods", the entire content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to the technical field of kitchen appliances, and particularly to a splash-proof fan and a range hood. Background Art

[0003] With the continuous progress of the self-cleaning technology of range hoods, steam cleaning or water cleaning has been widely used in the self-cleaning field of range hoods. Its basic principle is that a steam generator generates steam or a water pump pumps water, and the steam or water is conveyed to the nozzle at the end of the spray pipe. The steam or water quickly sprays out from the nozzle to wash the impeller and the volute for cleaning.

[0004] Currently, fixed holes are generally opened on the spray pipe, and the number of holes is generally more than 3. However, this cleaning method has the following deficiencies: First, during cleaning, steam or water sprays out from the fixed nozzles. Since there are a limited number of nozzles, the flushing force between the nozzles is very weak, and the cleaning effect is not good. Second, due to the large number of openings, with a certain power of the steam generator or pump, the steam pressure or water pressure coming out of the nozzles is correspondingly low and unstable, resulting in a poor cleaning effect.

[0005] In order to increase the flushing force, improve the cleaning effect, and achieve comprehensive cleaning, as the applicant's prior application, the invention patent "A Cleaning Device for a Range Hood Fan System" with the application number CN201711480573.9 (publication number CN109990332A) and the utility model patent "A Range Hood with a Self-Cleaning Function" with the application number CN201920819655.X (publication number CN210197396U) both propose the design idea of comprehensively cleaning the impeller by moving the cleaning medium supply member to improve the cleaning effect.

[0006] However, for the first above-mentioned scheme, it is necessary to open a long strip-shaped relief hole extending along the moving direction of the cleaning medium supply member on the volute, which requires a large modification to the original structure of the fan and is likely to affect the performance of the fan. If an additional shielding part is provided, there is a problem that the viscous grease will stick to the shielding part after long-term use, resulting in its inability to open or close tightly. Although the second above-mentioned scheme does not require opening a large relief hole, the horizontal feeding type cleaning medium supply member therein requires a large amount of end-side space, and it is difficult for the current existing product dimensions to support such a large space. Summary of the Invention

[0007] In view of the current situation of the prior art, the present application rotates the cleaning medium supply member to change the spraying direction of the nozzle, thereby achieving the full-range cleaning of the impeller. However, when the cleaning medium supply member is rotated to clean the front end of the blade, the cleaning medium is sprayed obliquely forward, so that after the cleaning medium impacts the blade, it will still flow obliquely forward along the blade surface under the action of the residual kinetic energy, resulting in the cleaning medium carrying oil stains splashing out from the forward air inlet of the fan, which will pose a great challenge to the safety and hygiene of the range hood. To solve this problem, the present application provides a splash-proof fan and a range hood, which can effectively prevent the cleaning medium from splashing out from the air inlet and ensure the safety and hygiene of the range hood.

[0008] Another advantage of the present invention is to provide a splash-proof fan and a range hood. In one embodiment of the present invention, the splash-proof fan can effectively block the cleaning medium from splashing out of the air inlet by designing a baffle at a specific position of the air inlet ring.

[0009] Another advantage of the present invention is to provide a splash-proof fan and a range hood. In one embodiment of the present invention, the splash-proof fan can ensure a large average flushing force while preventing splashing, so as to achieve a better cleaning effect.

[0010] Another advantage of the present invention is to provide a splash-proof fan and a range hood. In one embodiment of the present invention, the splash-proof fan can use the residual kinetic energy of the cleaning medium to perform secondary flushing on the blade through the baffle, which helps to improve the cleaning effect.

[0011] Another advantage of the present invention is to provide a splash-proof fan and a range hood. To achieve the above object, expensive materials or complex structures are not required in the present invention. Therefore, the present invention successfully and effectively provides a solution, not only providing a simple splash-proof fan and a range hood, but also increasing the practicability and reliability of the splash-proof fan and the range hood.

[0012] To achieve at least one of the above advantages or other advantages and objects of the present invention, the present invention provides a splash-proof fan, including:

[0013] A fan main body, the fan main body includes a volute and an impeller rotatably arranged in the volute;

[0014] A cleaning device, the cleaning device includes a cleaning medium supply member arranged relative to the volute, and the cleaning medium supply member is used for spraying a cleaning medium onto the current cleaning blade of the impeller to form a scouring flow on the current cleaning blade; and

[0015] A flow baffle, which extends from the volute into the air inlet cavity of the impeller to correspond to the inner edge of the current cleaning blade, and is used to block the scouring flow flowing out from the inner edge of the current cleaning blade.

[0016] According to an embodiment of the present application, the flow baffle is located in the return flow area of the volute; the return flow area is a fan-shaped area on the volute with a central angle θ between 0° and 150°.

[0017] According to an embodiment of the present application, the volute of the fan main body includes an annular wall, a volute tongue protruding outward from the annular wall, and an air inlet ring connected to both axial ends of the annular wall; the flow baffle axially extends from the air inlet ring to extend into the air inlet cavity of the impeller.

[0018] According to an embodiment of the present application, the flow baffle is integrally formed with the air inlet ring.

[0019] According to an embodiment of the present application, the width L of the flow baffle is greater than the distance S1 between the inner edges of the current cleaning blade at the starting cleaning position and the ending cleaning position.

[0020] According to an embodiment of the present application, the width L of the flow baffle is greater than or equal to the blade pitch S2 and less than three times the blade pitch S2, where the blade pitch S2 is the distance between the current cleaning blade and the previous cleaning blade.

[0021] According to an embodiment of the present application, the flow baffle is an arc-shaped baffle extending along the circumferential direction of the impeller on the volute.

[0022] According to an embodiment of the present application, the flow baffle is a guiding baffle extending bendably on the volute, and is used to guide the scouring flow flowing out from the inner edge of the current cleaning blade to other blades of the impeller.

[0023] According to an embodiment of the present application, the guiding baffle includes a drainage portion corresponding to the inner edge of the current cleaning blade and a diversion portion extending outward and bendably from the drainage portion, and the free end of the diversion portion points to other blades of the impeller.

[0024] According to an embodiment of the present application, both the drainage portion and the diversion portion of the guiding baffle have a concave arc structure, and the drainage portion and the diversion portion extend on the same circumference.

[0025] According to an embodiment of the present application, when the current cleaning blade is in the starting cleaning area, the free end of the diversion portion of the guiding baffle points to the outer edge of the upper three cleaning blades of the impeller.

[0026] According to another aspect of the present application, the present application further provides a range hood, comprising:

[0027] a housing; and

[0028] any one of the above-described splash-proof fans, the splash-proof fan being assembled in the housing. Description of the Drawings

[0029] Figure 1 A perspective structural view of Embodiment 1 of the range hood of the present invention;

[0030] Figure 2 is Figure 1 A perspective structural view after omitting the housing in (the cleaning medium supply member is in the initial position);

[0031] Figure 3 is Figure 2 A longitudinal sectional view after omitting the water tank, the steam generator, and the water receiving box in ;

[0032] Figure 4 is Figure 3 A left view after omitting the volute and the driving device in ;

[0033] Figure 5 is Figure 4 A left view after the cleaning medium supply member rotates to the intermediate position in ;

[0034] Figure 6 is Figure 5 A left view after the cleaning medium supply member rotates to the end position in ;

[0035] Figure 7 is Figure 3 A left view after the cleaning medium supply member rotates to the middle plate position when the fan in is a double-inlet fan;

[0036] Figure 8 is Figure 2 A schematic diagram of the relative position between the cleaning medium supply member and the blades during the rotation of the cleaning medium supply member in ;

[0037] Figure 9 A flowchart of the self-cleaning prompt of the range hood in Embodiment 1 of the present invention;

[0038] Figure 10 A flowchart of the global cleaning of the range hood in Embodiment 1 of the present invention (taking time as the sampling interval);

[0039] Figure 11 A flowchart of the global cleaning of the range hood in Embodiment 1 of the present invention (taking the number of steps as the sampling interval);

[0040] Figure 12Flow chart for collecting oil-stained areas in the range hood according to Embodiment 1 of the present invention;

[0041] Figure 13 Longitudinal sectional view of the fan, cleaning medium supply member, and drive device of the range hood according to Embodiment 2 of the present invention in a non-operating state;

[0042] Figure 14 Schematic three-dimensional structure diagram of the fan, cleaning medium supply member, and drive device of the range hood according to Embodiment 3 of the present invention in a non-operating state;

[0043] Figure 15 Longitudinal sectional view of the fan, cleaning medium supply member, and drive device of the range hood according to Embodiment 3 of the present invention in an operating state;

[0044] Figure 16 Longitudinal sectional view of the fan, cleaning medium supply member, and drive device of the range hood according to Embodiment 4 of the present invention in a non-operating state;

[0045] Figure 17 Longitudinal sectional view of the fan, cleaning medium supply member, and drive device of the range hood according to Embodiment 4 of the present invention in an operating state;

[0046] Figure 18 Schematic structure diagram of a range hood according to a preferred embodiment of the present invention;

[0047] Figure 19 Shows Figure 18 A-A sectional view schematic diagram of the range hood in;

[0048] Figure 20 Shows a first example of a splash-proof fan in the range hood according to the above preferred embodiment of the present invention;

[0049] Figure 21 Shows a schematic structural diagram of a baffle and an air inlet ring in the splash-proof fan according to the above first example of the present invention;

[0050] Figure 22 Shows a partially enlarged schematic diagram of the splash-proof fan according to the above first example of the present invention;

[0051] Figure 23 Shows a simulation schematic diagram of the air flow velocity inside the splash-proof fan according to the above first example of the present invention;

[0052] Figure 24 Shows a sectional view schematic diagram of the splash-proof fan according to the above first example of the present invention;

[0053] Figure 25 Shows a splash-proof principle schematic diagram of the splash-proof fan according to the above first example of the present invention;

[0054] Figure 26 Shows a second example of the splash-proof fan according to the above preferred embodiment of the present invention.

[0055] Main element symbol description: 1. Housing; 2. Fan; 21. Volute; 210. Volute tongue; 211. Relief hole; 212. Drainage hole; 22. Impeller; 221. Blade; 222. Middle plate; 23. Driving member; 3. Cleaning medium supply member; 30. Penetrating part; 301. Inlet; 302. Outlet; 31. Rotating seat; 311. Rotating shaft; 312. Connecting arm; 3'. Cleaning medium supply member; 30'. Penetrating part; 31'. First transmission member; 311'. First rack; 312'. First gear; 313'. Elastic limit block; 302'. Outlet; 3". Cleaning medium supply member; 30". Penetrating part; 31". Second transmission member; 311". Second rack; 312". Second gear; 302". Outlet; 313". Limit sleeve; 3131". Bending channel; 4. Driving device; 5. Water tank; 6. Steam generator; 7. Water receiving box; 8. Sensor; 1A. Range hood; 10A. Housing; 20A. Splash-proof fan; 21A. Fan main body; 211A. Volute; 2110A. Return area; 2111A. Ring wall; 2112A. Volute tongue; 2113A. Air inlet ring; 2114A. Relief hole; 212A. Impeller; 210A. Central axis; 2120A. Air inlet chamber; 2121A. Current cleaning blade; 2122A. Previous cleaning blade; 2123A. Next cleaning blade; 2124A. Previous three cleaning blades; 22A. Cleaning device; 221A. Cleaning medium supply member; 220A. Rotation axis; 2211A. Moving part; 2212A. Nozzle; 222A. Driving mechanism; 223A. Rotating seat; 2231A. Rotating shaft; 2232A. Connecting arm; 23A. Flow blocking member; 231A. Arc-shaped baffle; 232A. Guiding baffle; 2321A. Drainage part; 2322A. Flow guiding part.

[0056] The above main element symbol description further describes the present invention in detail in combination with the drawings and specific embodiments. Specific embodiments

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0058] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0060] Embodiment 1:

[0061] like Figures 1 to 12 The first preferred embodiment of the range hood of the present invention is shown in FIG.

[0062] The fan 2 is disposed in the housing 1, and includes a volute 21, an impeller 22 disposed in the volute 21, and a driving member 23 for driving the impeller 22 to rotate. Figure 3 As shown, a clearance hole 211 is opened on the annular wall of the volute 21 at the position of the volute tongue 210, and a drainage hole 212 is opened at the bottom of the volute 21; and a plurality of blades 221 extending in the axial direction are arranged at intervals along the circumferential direction on the impeller 22.

[0063] The cleaning medium supply member 3 is tubular, and has a front section, a middle section, and a rear section in sequence along the flow direction of the cleaning medium. The end surface of the front section of the cleaning medium supply member 3 has an inlet 301 for the cleaning medium to enter, and the middle and rear sections of the cleaning medium supply member 3 are recorded as a penetration portion 30. The penetration portion 30 is a rigid member that can extend into the volute 21. The end surface of the penetration portion 30 has an outlet 302 for the cleaning medium to eject. In this embodiment, the cleaning medium supply member 3 is a rigid member as a whole.

[0064] The driving device 4 is a motor, which is installed at the volute tongue 210 of the volute 21, and its power output shaft is connected to the cleaning medium supply member 3 through the rotating seat 31. Specifically, the rotating seat 31 includes a rotating shaft 311 and a connecting arm 312, and the rotating shaft 311 is coaxially connected to the power output shaft of the driving device 4; the first end of the connecting arm 312 is connected to the outer peripheral wall of the rotating shaft 311, and the second end is connected to the front section of the cleaning medium supply member 3.

[0065] The driving device 4 is started to drive the penetration portion 30 of the cleaning medium supply member 3 to pass through the clearance hole 211 and rotate relative to the axis of the rotating shaft 311 to perform a swinging motion (i.e., a reciprocating motion around a certain axis within a certain angle range), so that the cleaning medium supply member 3 has at least two states:

[0066] In the working state, the outlet 302 of the penetration portion 30 extends into the volute 21 and faces the blade 221 of the impeller 22, and the cleaning medium ejected from the outlet 302 of the penetration portion 30 is ejected to the injection area at the blade 221 and reciprocates between the two axial ends of the impeller 22 to clean the impeller 22, and the cleaning range of the cleaning medium covers the entire impeller 22;

[0067] In a non-working state, the outlet 302 of the penetration portion 30 exits the volute 21 to prevent the outlet 302 of the penetration portion 30 from being blocked.

[0068] In the present invention, the "injection area" refers to the range formed when the cleaning medium contacts the blades 221 of the impeller 22 after being ejected from the outlet 302, and does not include the area formed when the cleaning medium flows along the blades 221 or drips from the blades 221 after being ejected onto the blades 221. The shape and size of the injection area are related to the structure and shape of the outlet 302 itself and the movement mode of the penetration portion 30. The present invention does not limit the shape and size of the injection area, as long as the injection area can clean the part between the two axial ends of the impeller 22 through reciprocating motion when the cleaning device is working.

[0069] In addition, if Figure 3 As shown, since the movement trajectory of the penetration part 30 at least at the end away from the outlet 302, i.e., point B, is a non-linear shape, when the outlet 302 of the penetration part 30 moves to the clearance hole 211, the minimum distance L between the end of the penetration part 30 away from the outlet 302, i.e., point B, and the volute 21 is less than the length of the penetration part 30. In this way, the cleaning medium supply part 3 can cover a larger cleaning range in a smaller activity space. On the one hand, it occupies less space, and on the other hand, it requires less modification to the original structure of the fan (i.e., only one clearance hole 211 for the penetration part 30 to pass through needs to be opened on the volute 21), which does not affect the performance of the fan.

[0070] In order to ensure that the injection area where the cleaning medium ejected from the outlet 302 of the penetration part 30 hits the blade 221 reciprocates between the two axial ends of the impeller 22, the rotation axis of the penetration part 30 is arranged at an angle with the central axis of the impeller 22 (that is, the angle between the rotation axis of the penetration part 30 and the central axis of the impeller 22 is greater than 0° and less than 180°, that is to say, the rotation axis of the penetration part 30 is neither parallel nor overlapping with the central axis of the impeller 22). The reason is that when the rotation axis of the penetration part 30 is parallel or overlapping with the central axis of the impeller 22, the injection area where the cleaning medium ejected from the outlet 302 of the penetration part 30 hits the blade 221 will reciprocate circumferentially along the impeller 22. In this way, when the rotating penetration part 30 sprays steam onto the rotating impeller 22, the above-mentioned injection area can only cover a very narrow annular surface on the outer circumference of the impeller 22 and cannot cover other positions of the impeller 22 in the axial direction. The rotation of the penetration part 30 also loses its meaning because in this case, the same cleaning effect can be achieved even if the penetration part 30 does not rotate. In this embodiment, the rotation axis of the penetration part 30 is perpendicular to the central axis of the impeller 22, and the plane where the rotation trajectory of any point at the outlet 302 of the penetration part 30 is arranged parallel to the central axis of the impeller 22. In this way, the injection area where the cleaning medium ejected from the outlet 302 of the penetration part 30 hits the blade 221 will move along the axial direction of the impeller 22, that is, the length direction of the blade 221, and the stroke is the shortest. Of course, in actual application, it may not be possible to accurately ensure that the movement trajectory of the above-mentioned injection area is exactly parallel to the central axis of the impeller 22. When the movement trajectory deviates from the central axis of the impeller 22 by a certain angle, the entire impeller 22 can still be cleaned, but the stroke of the injection area will be relatively extended.

[0071] In order to avoid interference between the penetration part 30 and the volute 21 during the rotation process when the aperture of the relief hole 211 is relatively small, the part of the penetration part 30 passing through the relief hole 211 during movement is an arc segment, and the center of the arc segment is located on the axis of the rotating shaft 311 (that is, the rotation axis of the penetration part 30). Denote the outer diameter of the arc segment as D1 and the aperture of the relief hole 211 as D2. The relationship between D1 and D2 satisfies: D1 ≤ D2 ≤ 1.2D1. Of course, it is best to design D1 = D2, so as to ensure that during the rotation process, the arc segment of the penetration part 30 always blocks the relief hole 211. On the one hand, it can prevent the cleaning medium and oil in the volute 21 from splashing out through the relief hole 211, and on the other hand, it can avoid affecting the normal operation of the fan 2. Of course, in actual application, the shape of the relief hole 211 can also be designed into a square or other shapes, as long as the cross-sectional shape of the arc segment is adapted to the shape of the relief hole 211.

[0072] In addition, through experimental verification, as Figure 7As shown, for the double-inlet impeller (the impeller 22 has a middle disc 222), generally, the front end is the main air inlet, and the rear end is the auxiliary air inlet. The oil stains are concentrated at the position where the blades 221 pass through the middle disc 222. Based on the above phenomenon, in this embodiment, when arranging the cleaning medium supply member 3, it will be arranged close to the middle disc 222 so that when the spraying area corresponds to the middle disc 222 (that is, the spraying area moves to the position where the blades 221 pass through the middle disc 222), the spraying path from the outlet 302 of the penetrating part 30 to the impeller 22 is the shortest. Under the same spraying conditions, the shorter the spraying path, the greater the spraying force, which helps to uniformly clean the entire impeller according to the distribution amount of the oil stains.

[0073] In order to ensure that the flushing time for each point on the blade 221 is basically the same, it is necessary to set the reciprocating motion of a point A in the axial direction between the two end parts of the impeller 22 in the axial direction of the spraying area where the cleaning medium is sprayed onto the impeller 22 as a uniform motion. The motion of the penetrating part 30 should be set as a variable motion. The derivation formula is as follows:

[0074] As Figure 8 shown, θ is the angular position corresponding to the penetrating part 30 at different times. Taking Δt as the unit time, the variable motion is decomposed into several uniform motions. Select any one of the uniform motions. Then, when Δt approaches 0, the rotation angle Δθ of the penetrating part 30 within this unit time is:

[0075]

[0076] Since v0t = h tan θt, that is

[0077] Therefore,

[0078] Among them, the point A in the spraying area where the cleaning medium is sprayed onto the impeller 22 is defined as being ejected from the point A0 at the outlet 302 of the penetrating part 30; ω is the rotational speed of the penetrating part 30; θ is the rotation angle of the penetrating part 30; h is the minimum distance from the rotation center of the point A0 at the outlet 302 of the penetrating part 30 to the blade 221 where the point A in the spraying area is sprayed; v0 is the moving speed of the point A in the spraying area.

[0079] In this embodiment, when t = 0, θ = 0.

[0080] The water tank 5 has a water inlet end and a water outlet end and is used to store water. In this embodiment, the top of the water tank 5 has an opening as the water inlet end.

[0081] The steam generator 6 has a water inlet end and a steam outlet end, and is capable of heating water to generate steam. The water inlet end of the steam generator 6 is connected to the water outlet end of the water tank 5 through a water pipe 61, and the steam outlet end of the steam generator 6 is connected to the inlet 301 of the cleaning medium supply member 3 through a steam pipe 62. In this embodiment, a water suction pump is integrated at the water inlet end of the steam generator 6.

[0082] The top of the water receiving box 7 has an opening. The water receiving box 7 is located directly below the drain hole 212 of the volute 21 and is used to receive the sewage discharged from the drain hole 212. In this embodiment, the right side wall of the water tank 5 and the left side wall of the water receiving box 7 share a side wall, which is convenient for installation.

[0083] Since self-cleaning requires the user to add clean water and pour out waste water, the amount of water is a factor that the user cares about. If too much water is required during the cleaning process, it will make it difficult for women with less strength to feel strenuous in operation, affecting the user experience and reducing the product satisfaction; similarly, if the user needs to wait beside the range hood and add clean water and pour out waste water multiple times, it will dissatisfy office workers with a fast work rhythm. Therefore, the water consumption of the range hood self-cleaning technology should be small. Therefore, the capacities of the water tank 5 and the water receiving box 7 are approximately 650 ml.

[0084] The sensor 8 is installed at a position near the outlet 302 of the penetrating portion 30 and is used to detect the amount of oil stains at various positions along the axial direction between the two end portions of the impeller 22 in the axial direction. In this embodiment, the sensor 8 is a humidity sensor. After the impeller 22 is cleaned, there will be local remaining oil stains. After the impeller 22 is thrown off at high speed, the water and flowing oil stains on the blade 221 are thrown off, and its metal surface is in a dry state. However, the surface humidity of the oil stain is much higher than that of the metal blade surface after adsorbing water. At this time, the humidity sensor can detect the oil stain with high water content to locate the oil stain. Specifically, since the sensor 8 will rotate synchronously during the rotation of the penetrating portion 30, the detection area where the detection medium emitted from the sensor 8 shoots towards the blade 221 will reciprocate along the axial direction of the impeller 22, that is, the length direction of the blade 221, so as to detect the humidity of the corresponding detection area. After the impeller 22 is thrown off at high speed, the water at the position with less oil stain is easily thrown off, and the water residue at the position with more oil stain will be relatively more. Therefore, the higher the humidity, the more the amount of oil stain; by extension, a surface temperature detection sensor can also be used. Since the thermal conductivity coefficients of the metal and the oil stain are different, there will be an obvious temperature difference between the metal surface and the oil stain surface in a short time during centrifugal throwing off. The oil stain can be identified by using the thermal imaging principle to achieve the purpose of detecting the oil stain.

[0085] Of course, the above cleaning medium supply member 3, driving device 4, water tank 5, steam generator 6, water receiving box 7, and sensor 8 can also form an independent cleaning device. This cleaning device is not limited to cleaning the impeller 22 and can also be used to clean other components in the range hood that are stained with oil, such as the inner wall of the volute 21. In this cleaning device, the penetrating portion 30 of the cleaning medium supply member 3 serves as a moving portion and makes a swinging motion under the drive of the driving device 4, so that the outlet 302 of the moving portion has an arc-shaped motion trajectory. In this way, under the condition that the moving range of the cleaning medium supply member 3 is small, the cleaning medium ejected from the outlet 302 of the moving portion can cover a larger cleaning range. This cleaning device occupies a small space and has a wide cleaning range. In addition, since the moving portion is arc-shaped and the center of the moving portion is located on the rotation axis of the moving portion, the moving range of the moving portion can be minimized as much as possible to avoid occupying too much space.

[0086] The working principle of this embodiment is as follows:

[0087] (1) Start the driving member 23, driving device 4, and steam generator 6. The water in the water tank 5 enters the steam generator 6 through the water pipe 61. The steam generator 6 heats the water to generate steam and transports the steam to the cleaning medium supply member 3 through the steam pipe 62. The rotating penetrating portion 30 sprays steam toward the rotating impeller 22, so that the spraying area of the steam reciprocates axially between the front end and the rear end of the impeller 22 to perform global cleaning on the entire impeller 22:

[0088] ① As Figure 4 shown, the cleaning medium supply member 3 is in the initial position, and the steam ejected from the outlet 302 of the penetrating portion 30 aims at the rear edge of the blade 221 and sprays;

[0089] ② As Figure 5 shown, as the cleaning medium supply member 3 rotates further, the position aimed at by the outlet 302 of the penetrating portion 30 moves forward, and the spraying area of the steam slowly moves forward;

[0090] ③ As Figure 6 shown, when the spraying area reaches the frontmost end of the blade 221, the driving device 4 changes the rotation direction to start secondary flushing of the blade 221;

[0091] ④ Until the spraying area returns to the rearmost end of the blade 221, the driving device 4 changes the rotation direction again and repeats the above movement;

[0092] After the cleaning is completed and in the non-working state, the cleaning medium supply member 3 rotates outwardly to completely disengage from the relief hole 211, so that the outlet 302 of the penetrating portion 30 exits the volute 21, thereby minimizing the risk of blockage of the outlet 302 of the penetrating portion 30 caused by being placed in the volute 21 for a long time. However, since the relief hole 211 is no longer blocked, the airflow in the volute 21 can still easily rush through the relief hole 21 towards the outlet 302 of the penetrating portion 30, causing blockage thereof;

[0093] (2) After the global cleaning is completed, the impeller 22 starts to rotate at high speed to throw off the grease and cleaning liquid from the impeller 22. Then, the grease test sensor is activated to detect the grease on the blades 221, and the detection results are recorded in the database;

[0094] After the global cleaning, the centrifugal force of high-speed throwing-off is used to throw off the loosened oil stains and cleaning water by flushing, reducing the burden of precise cleaning. The liquid oil-water mixture covering the oil stains actually weakens the cleaning power of the high-pressure jet;

[0095] (3) Start the regional cleaning. During the regional cleaning, the cleaning medium supply member 3 actively positions to the point with oil stains and starts the fixed-point cleaning until it is completely cleaned. For multiple oil stain points, sort the areas and give priority to cleaning the areas with larger oil stain areas;

[0096] Since the current self-cleaning technology requires users to add water by themselves, if too much water is added each time, it will pose a burden and risk to the user's water addition, wastewater storage, and wastewater disposal. Moreover, generally, the impeller 22 cannot be completely cleaned through a single complete cleaning. The regional cleaning can give priority to cleaning the positions with more oil adhesion points, thereby effectively improving the cleaning rate.

[0097] As Figure 9 shown, the above range hood performs self-cleaning prompts through the following method before self-cleaning:

[0098] S001. Start, read the time T1 from the last cleaning to now, read the cumulative usage time T2 from the last cleaning to now, and enter S002;

[0099] S002. Judge whether the values of T1 and T2 satisfy: T1 > D and T2 > H. If so, enter S003; if not, enter S005;

[0100] S003. Light up the self-cleaning prompt and enter S004;

[0101] S004. Judge whether the user starts self-cleaning. If so, enter S005; if not, return to S003;

[0102] S005. Turn off the self-cleaning prompt and end;

[0103] Among them, D is the maximum allowable cleaning interval time under normal conditions. Grease is easily removed when it first adheres to the impeller surface. As time goes by, the adhered grease will gradually oxidize, and it is efficient to clean the grease before it oxidizes. Therefore, the value of D is preferably 1 to 180 days, and the best is 90 days, at this time the grease oxidation rate is low;

[0104] H is the maximum allowable cumulative usage time under normal conditions. For some users who use it less frequently, this scheme defines the cumulative time duration from the last cleaning to the present. For users who use it less frequently, there is no need to clean frequently. The value of H is preferably 1 to 180 h, and the best is 60 h.

[0105] The above control method for the self-cleaning operation of the range hood includes the following steps:

[0106] Step 1: Spray the cleaning medium from the moving cleaning medium supply member 3 onto the rotating impeller 22, so that the spraying area of the cleaning medium reciprocates axially between the front end and the rear end of the impeller 22 to perform global cleaning on the entire impeller 22;

[0107] Specifically, as Figure 10 shown, the above step 1 is implemented by the following method:

[0108] S101: Start, the initial value of θ is 0, the initial value of t is 0, start the driving member 23 to drive the impeller 22 to rotate, and enter S102;

[0109] S102: Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record ta, and enter S103;

[0110] S103: Collect the values of t and θ, and enter S104;

[0111] S104: Judge whether the θ value satisfies: θ ≥ θmax, if so, enter S106, if not, enter S105;

[0112] S105: Judge whether the t value satisfies: t - ta ≥ Δt, if so, return to S102, if not, return to S103;

[0113] S106: Start the driving device 4 to drive the cleaning medium supply member 3 to rotate backward, ω = f(t), record tb, and enter S107;

[0114] S107: Collect the values of t and θ, and enter S108;

[0115] S108: Judge whether the θ value satisfies: θ ≤ 0, if so, enter S110, if not, enter S109;

[0116] S109. Determine whether the t value satisfies: t - tb ≥ Δt. If yes, return to S106; if no, return to S107;

[0117] S110. Determine whether the t value satisfies: t ≥ t0. If yes, enter S111; if no, return to S102;

[0118] S111. Turn off the driving member 23 and the driving device 4, and end;

[0119] Wherein, θmax is the rotation angle when the injection area of the cleaning medium supply member 3 is located at the foremost end of the impeller 22, and its value is preferably 30 to 75°;

[0120] Δt is the time interval between two adjacent speed changes of the driving device 4. The smaller this value, the more it can ensure that the reciprocating movement along the axial direction between one point A of the injection area where the cleaning medium shoots at the impeller 22 and the two axial ends of the impeller 22 is a uniform motion. This value is preferably 1 to 100 ms;

[0121] t0 is the total global cleaning duration, and its value is preferably 10 to 20 min;

[0122] Of course, Δθ can also be used as the rotation angle interval between two adjacent speed changes of the driving device 4, and this value is preferably 0.1 to 1°.

[0123] In addition, a stepping motor can also be used as the driving device 4. In this way, as Figure 11 shown, the above step one can be realized by the following method:

[0124] S101. Start. The initial value of θ is 0, the initial value of n is 0. Start the driving member 23 to drive the impeller 22 to rotate, and enter S102;

[0125] S102. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record na, and enter S103;

[0126] S103. Collect the n and θ values, and enter S104;

[0127] S104. Determine whether the θ value satisfies: θ ≥ θmax. If yes, enter S106; if no, enter S105;

[0128] S105. Determine whether the n value satisfies: n - na ≥ Δn. If yes, return to S102; if no, return to S103;

[0129] S106. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate backward, ω = f(t), record nb, and enter S107;

[0130] S107. Collect the n and θ values, and enter S108;

[0131] S108. Determine whether the θ value satisfies: θ ≤ 0. If so, proceed to S110; if not, proceed to S109;

[0132] S109. Determine whether the n value satisfies: n - nb ≥ Δn. If so, return to S106; if not, return to S107;

[0133] S110. Determine whether the t value satisfies: t ≥ t0. If so, proceed to S111; if not, return to S102;

[0134] S111. Turn off the driving member 23 and the driving device 4, and end;

[0135] Wherein, n is the number of steps of the stepper motor. Since the step angle of the stepper motor = 360° / (number of rotor teeth * n), therefore, when n is determined, the value of θ can be calculated;

[0136] Δn is the step interval between two adjacent speed changes of the stepper motor, and this value is preferably 1 - 200.

[0137] Step Two: Generate centrifugal force by rotating the impeller 22, thereby removing the cleaning medium and grease on the surface of the impeller 22;

[0138] Specifically, the above Step Two is achieved by the following method: Start the driving member 23, set the rotation speed at 1500 - 3000 r / min, dehydrate and deoily for 0.1 - 10 min, and then turn off the driving member 23;

[0139] Step Three: Detect the amount of oil stains at each position along the axial direction between the two end parts of the impeller 22 in the axial direction by rotating the sensor 8, and collect the oil-stained area of the impeller 22;

[0140] Specifically, as Figure 12 shown, the above Step Three is achieved by the following method:

[0141] S301. Start. The initial value of θ is 0, the initial value of t is 0, the initial value of tc is 0, the initial value of n is 1, start the sensor 8, and proceed to S302;

[0142] S302. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record ta, and proceed to S303;

[0143] S303. Determine whether the t value satisfies: t - tc ≥ Δt'. If so, proceed to S304; if not, proceed to S307;

[0144] S304. Collect Record tc, and proceed to S305;

[0145] S305. Determine whether the value satisfies: If yes, go to S306; if no, go to S307;

[0146] S306: Record θn, let n = n + 1, and go to S307;

[0147] S307: Collect the values of t and θ, and go to S308;

[0148] S308: Determine whether the value of θ satisfies: θ ≥ θmax. If yes, go to S3010; if no, go to S309;

[0149] S309: Determine whether the value of t satisfies: t - ta ≥ Δt. If yes, return to S302; if no, return to S303;

[0150] S3010: Turn off the drive device 4 and the sensor 8, and end;

[0151] Among them, θmax is the rotation angle when the injection area of the cleaning medium supply member 3 is located at the foremost end of the impeller 22, and its value is preferably 30 - 75°;

[0152] Δt is the time interval between two adjacent speed changes of the drive device 4. The smaller this value is, the more it can ensure that the reciprocating movement of the injection area of the cleaning medium shooting at one of the points A on the impeller 22 along the axis between the two axial ends of the impeller 22 is a uniform motion, and this value is preferably 1 - 100 ms;

[0153] Δt’ is the time interval between two adjacent samplings of the sensor 8. The smaller this value is, the greater the sampling accuracy, and this value is preferably 1 - 100 ms;

[0154] is the maximum oil stain characterization value allowed in the normal state. In this embodiment, its value is preferably 20 - 100% (humidity);

[0155] Step Four: Spray the cleaning medium from the moving cleaning medium supply member 3 onto the rotating impeller 22, so that the injection area of the cleaning medium reciprocates axially between the front end and the rear end of the oil-stained area, and perform area cleaning on the oil-stained area.

[0156] Specifically, the above step 4 is implemented by the following method: first, the oily areas collected in step 3 are sorted by area size, and then the oily areas are cleaned in descending order of area size, that is, the cleaning medium supply member 3 is rotated to the corresponding rotation angle θ'n for regional cleaning. Since there is a stable angle between the sensor 8 and the cleaning medium supply member 3, it is necessary to use Δθ' to correct the step difference during data processing, that is, θ'n=θn+Δθ', Δθ' is the angle between the cleaning medium injection path of the cleaning medium supply member 3 and the medium ejection path detected by the sensor 8; as for how to sort the oily areas by area size, in this embodiment, the above-mentioned recorded θ1, θ2, ..., θn are analyzed to determine whether two consecutive oily points, three oily points, ... are found. Specifically, it is achieved by detecting whether the angles of two adjacent oily points are the rotation angles within one unit time, and whether the three consecutive oily points are the rotation angles within two unit times, and finally accurate cleaning is achieved in reverse order, because the later it is recorded in the database, the more consecutive it is.

[0157] Embodiment 2:

[0158] like Figure 13 FIG. 2 is a second preferred embodiment of the range hood of the present invention. The difference from the first embodiment is that:

[0159] In this embodiment, Figure 13 As shown, in the non-working state, the end face of the penetration portion 30 is opposite to the clearance hole 211, and the outlet 302 of the penetration portion 30 is located on the adjacent side wall of the end face. In this way, in the non-working state, the airflow in the volute 21 is no longer easy to rush to the outlet 302 of the penetration portion 30 through the clearance hole 21 to cause blockage.

[0160] Embodiment 3:

[0161] like Figure 14 and Figure 15 The third preferred embodiment of the range hood of the present invention is shown in FIG. The difference from the second embodiment is that:

[0162] In this embodiment, the cleaning medium supply member 3' is in a spiral shape, and the rear section thereof is the threading portion 30'. The cleaning medium supply member 3' is drivingly connected to the power output end of the driving device 4 through the first transmission assembly 31'. The first transmission assembly 31' includes a first rack 311', a first gear 312' and an elastic limit block 313'. Specifically, the first rack 311' is arranged on the first side of the cleaning medium supply member 3' along the extending direction of the cleaning medium supply member 3'; the first gear 312' is coaxially connected to the power output end of the driving device 4 and meshes with the first rack 311'; the elastic limit block 313' is installed on the volute 21 and is located on the second side of the cleaning medium supply member 3', so that the cleaning medium supply member 3' is clamped between the first gear 312' and the elastic limit block 313'.

[0163] Start the driving device 4 to drive the first gear 312' to rotate. Since the first rack 311' meshes with the first gear 312', the first rack 311' drives the cleaning medium supply member 3' to make a spiral curve movement relative to the volute 21.

[0164] The working principle of this embodiment is as follows:

[0165] (1) As shown in the figure, in the non-working state, the outlet 302' of the threading portion 30' exits the volute 21 to avoid the risk of blockage of the outlet 302' of the threading portion 30'' caused by being placed in the volute 21 for a long time; Figure 14 As shown in the figure, in the non-working state, the outlet 302' of the threading portion 30' exits the volute 21 to avoid the risk of blockage of the outlet 302' of the threading portion 30'' caused by being placed in the volute 21 for a long time;

[0166] (2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3' to make a spiral curve movement relative to the volute 21, so that the outlet 302' of the threading portion 30' extends into the volute 21 and faces the blade 221 of the impeller 22. As shown in the figure, in the working state, by periodically changing the rotation direction of the driving device 4, the spraying area where the cleaning medium ejected from the outlet 302' of the threading portion 30' shoots at the blade 221 can reciprocate between the two end portions in the axial direction of the impeller 22, realizing the cleaning of the impeller 22. Figure 15 As shown in the figure, in the working state, by periodically changing the rotation direction of the driving device 4, the spraying area where the cleaning medium ejected from the outlet 302' of the threading portion 30' shoots at the blade 221 can reciprocate between the two end portions in the axial direction of the impeller 22, realizing the cleaning of the impeller 22.

[0167] Embodiment 4:

[0168] As shown in Figure 16 and Figure 17 shown, it is the fourth preferred embodiment of the range hood of the present invention. The difference from Embodiment 2 is that:

[0169] In this embodiment, the relief hole 211 is opened on the end wall of the volute 21, and the cleaning medium supply member 3” is an elastic strip-shaped pipeline, the rear section of which is the penetrating part 30”. The cleaning medium supply member 3” is drivingly connected to the power output end of the driving device 4 through the second transmission assembly 31”. The second transmission assembly 31” includes a second rack 311”, a second gear 312” and a limiting sleeve 313”. Specifically, the number of the second racks 311” is at least two, which are sequentially sleeved on the cleaning medium supply member 3” along the extending direction of the cleaning medium supply member 3”, and the adjacent ends of the adjacent second racks 311” are hinged; the second gear 312” is coaxially connected to the power output end of the driving device 4 and can mesh with each second rack 311”; the limiting sleeve 313” is installed on the volute 21, and has a bending channel 3131” inside for the cleaning medium supply member 3” and the second rack 311” to pass through.

[0170] Start the driving device 4 to drive the second gear 312” to rotate. Since the second rack 311” can mesh with each second gear 312”, the second rack 311” drives the cleaning medium supply member 3’ to move relative to the volute 21. During the movement, the outlet 302” of the penetrating part 30” makes a linear motion, and the end of the penetrating part 30” away from the outlet 302” moves along the bending channel 3131”. Its movement trajectory is a non-linear shape, and the non-linear shape can be a curve, a broken line, etc., which can be a regular trajectory or an irregular trajectory, as long as it is ensured that it is not a linear motion.

[0171] The working principle of this embodiment is as follows:

[0172] (1) As Figure 16 shown, in the non-working state, the outlet 302” of the penetrating part 30” exits the volute 21 to avoid the risk of blockage of the outlet 302” of the penetrating part 30” caused by being placed in the volute 21 for a long time. Moreover, the cleaning medium supply member 3” is arranged along the bending channel 3131” under the limitation of the limiting sleeve 313” to reduce the occupied space;

[0173] (2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3” to move backward relative to the volute 21 so that the outlet 302” of the penetrating part 30” extends into the volute 21 and faces the blade 221 of the impeller 22. As Figure 17 shown, in the working state, the cleaning medium supply member 3” extending into the volute 21 will recover to a long strip structure under its own elastic force. By periodically changing the rotation direction of the driving device 4, the injection area where the cleaning medium ejected from the outlet 302” of the penetrating part 30” shoots at the blade 221 can reciprocate between the two axial ends of the impeller 22, realizing the cleaning of the impeller 22; the cleaning medium supply member 3” exposed outside the volute 21 is arranged along the bending channel 3131” under the limitation of the limiting sleeve 313” to reduce the occupied space.

[0174] It should be noted that in the above-mentioned Embodiments 1 to 3 of the present application, the cleaning medium supply member 3 (3') is rotatable relative to the volute 21 of the blower 2, so that the spraying area of the cleaning medium sprayed from the cleaning medium supply member 3 (3') towards the impeller 22 reciprocates between the two axial ends of the impeller 22, so as to achieve full-area cleaning of the entire impeller. However, when the cleaning medium supply member 3 (3') rotates relative to the volute 21 to clean the two axial ends of the impeller 22, the cleaning medium supply member 3 (3') will spray the cleaning medium obliquely onto the blade 221, and the cleaning medium will still flow obliquely along the surface of the blade 221 under the action of the residual kinetic energy after impacting the blade 221, resulting in the cleaning medium carrying oil stains splashing outwards from the air inlet of the blower 2, which will pose a great challenge to the safety and hygiene of the range hood. To solve this problem, the present application provides a splash-proof blower and a range hood, which can effectively prevent the cleaning medium from splashing out from the air inlet and ensure the safety and hygiene of the range hood.

[0175] Specifically, according to another aspect of the present application, as Figures 18 to 26 shown, a preferred embodiment of the present application provides a range hood 1A, which may include a housing 10A and a splash-proof blower 20A assembled in the housing 10A for sucking oil fumes. It can be understood that the range hood 1A of the present application may also but is not limited to include a water tank, a steam generator, a water receiving box and / or a sensor to assist in completing the oil fume sucking function, which will not be elaborated herein.

[0176] More specifically, as Figure 19 and Figure 20 shown, the splash-proof blower 20A of the present application may include a blower main body 21A, a cleaning device 22A and a baffle 23A. The blower main body 21A may include a volute 211A and an impeller 212A rotatably arranged in the volute 211A. The cleaning device 22A may include a cleaning medium supply member 221A arranged relative to the volute 211A, and the cleaning medium supply member 221A is used to spray the cleaning medium onto the current cleaning blade 2121A of the impeller 212A to form a scouring flow on the current cleaning blade 2121A. The baffle 23A extends from the volute 211A into the air inlet cavity 2120A of the impeller 212A corresponding to the inner edge of the current cleaning blade 2121A, and is used to block the scouring flow flowing out from the inner edge of the current cleaning blade 2121A to prevent the scouring flow from flowing out or splashing out of the volute 211A. It can be understood that the blower main body 21A mentioned in the present application also includes a driving member for driving the impeller 212A to rotate, such as a motor, etc.; the inner edge of the current cleaning blade 2121A mentioned in the present application refers to the edge of the current cleaning blade 2121A close to the axis of the impeller 212A (as Figure 22the bottom edge of the current cleaning blade 2121A); and the edge of the current cleaning blade 2121A that is far from the axis of the impeller 212A (such as Figure 22 the top edge of the current cleaning blade 2121A) is defined as the outer edge of the current cleaning blade 2121A.

[0177] It should be noted that a plurality of axially extending blades are circumferentially spaced on the impeller 212A. In this application, the blade directly impacted by the cleaning medium ejected through the cleaning medium supply member 221A is defined as the current cleaning blade 2121A; in other words, when any blade on the impeller 212A rotates to a position corresponding to the cleaning medium supply member 221A and is directly impacted by the ejected cleaning medium, this blade is defined as the current cleaning blade 2121A. It can be understood that the inner edges of all the blades on the impeller 212A cooperate to form the air inlet chamber 2120A of the impeller 212A; at the same time, the outer edges of all the blades on the impeller 212A cooperate with the volute to form the air outlet chamber of the impeller 212A; the axial direction mentioned in this application refers to the extending direction of the central axis 210A of the impeller 212A.

[0178] Optionally, the cleaning medium supply member 221A is rotatably arranged on the volute 211A. Since the cleaning medium supply member 221A ejects the cleaning medium obliquely when rotating to clean the axial end of the blade, and the cleaning medium ejected onto the current cleaning blade 2121A scours the side of the current cleaning blade 2121A to form a scouring flow flowing towards the inner edge of the current cleaning blade 2121A, the scouring flow formed by the obliquely ejected cleaning medium will flow obliquely on the side of the current cleaning blade 2121A and still flow obliquely in the air inlet chamber 2120A after flowing out of the inner edge of the current cleaning blade 2121A, resulting in the cleaning medium carrying oil stains being easily splashed outwards from the air inlet of the fan. However, as Figure 20 、 Figure 22 and Figure 24 shown, in the splash-proof fan 20A of this application, the baffle 23A extends from the volute 211A into the air inlet chamber 2120A of the impeller 212A to correspond to the inner edge of the current cleaning blade 2121A, so that the obliquely flowing scouring flow will be blocked by the baffle 23A after flowing out of the inner edge of the current cleaning blade 2121A, preventing the scouring flow from rushing out of the volute 211A and ensuring the safety and hygiene of the range hood.

[0179] Exemplarily, in the first example of this application, as Figures 20 to 25As shown, the volute 211A of the fan main body 21A may include an annular wall 2111A, a volute tongue 2112A protruding outward from the annular wall 2111A, and an air inlet ring 2113A connected to both axial ends of the annular wall 2111A. It can be understood that the air inlet ring 2113A of the present application is provided with an air inlet that communicates the external space of the volute 211A with the air inlet chamber 2120A of the impeller 212A. It can be understood that although the fan main body 21A of the splash-proof fan 20A has two air inlets, namely a front air inlet and a rear air inlet, the housing 10A of the range hood 1A usually covers the rear air inlet of the fan main body 21A, resulting in the opening of the front air inlet of the fan main body 21A. Therefore, in other examples of the present application, the baffle 23A can ensure the safety and hygiene of the range hood by only blocking the scouring flow that flows obliquely forward to prevent the scouring flow from rushing out of the front air inlet of the fan.

[0180] Optionally, as Figure 20 and Figure 22 shown, the baffle 23A of the present application axially extends from the air inlet ring 2113A of the volute 211A to extend into the air inlet chamber 2120A of the impeller 212A and corresponds to the inner edge of the current cleaning blade 2121A. In this way, when the cleaning medium supply member 221A is rotated to clean the front end or the rear end of the blade, the cleaning medium supply member 221A will spray the cleaning medium obliquely forward or backward, so that the cleaning medium will still flow obliquely forward or backward on the cleaning surface of the current cleaning blade 2121A under the action of the residual kinetic energy after impacting the current cleaning blade 2121A. However, after flowing obliquely forward or backward out of the inner edge of the current cleaning blade 2121A, it will be blocked by the baffle 23A, preventing the cleaning medium carrying oil stains from flowing out or splashing out from the front air inlet or the rear air inlet of the fan main body 21A, and ensuring the safety and hygiene of the range hood 1A. It can be understood that the cleaning surface of the current cleaning blade 2121A mentioned in the present application refers to the side of the current cleaning blade 2121A facing the cleaning medium supply member 221A (such as Figure 22 the right side of the current cleaning blade 2121A in

[0181] Optionally, as Figure 21 and Figure 24 shown, the baffle 23A integrally extends from the air inlet ring 2113A, that is to say, the baffle 23A and the air inlet ring 2113A are integrally formed, which helps to reduce the assembly difficulty of the splash-proof fan 20A and reduce the cost. It can be understood that in other examples of the present application, the baffle 23A can also be fixed to the air inlet ring 2113A by means such as welding or screwing, and the present application will not elaborate on this.

[0182] Optionally, as Figure 22As shown, the baffle 23A is located in the recirculation zone 2110A of the volute 211A to reduce the influence of the baffle 23A on the air performance of the fan. It can be understood that although the baffle 23A extending into the air inlet cavity 2120A of the impeller 212A will affect the air performance of the fan, the baffle 23A of the present application is located in the recirculation zone 2110A of the volute 211A, where the air inflow is small, which helps to greatly reduce the influence on the air performance.

[0183] Optionally, as Figure 22 shown, the cleaning medium supply member 221A of the present application is disposed in the recirculation zone 2110A of the volute 211A, so as to open a relief hole in the recirculation zone 2110A of the volute 211A, which helps to reduce the influence of the opening of the relief hole on the air performance.

[0184] It should be noted that, as Figure 22 and Figure 23 shown, according to the wind speed simulation diagram in the fan, it can be known that the recirculation zone 2110A of the volute 211A of the present application is implemented as a fan-shaped area on the volute 211A with a central angle θ between 0° and 150°, where the central angle θ is centered on the axis of the impeller 212A, and the central angle θ starts from the 0° line and gradually increases along the rotation direction of the impeller 212A (such as Figure 22 the clockwise direction); the 0° line is a straight line passing through the axis of the impeller 212A and tangent to the arc surface of the volute tongue 2112A. It can be understood that in the recirculation zone 2110A of the volute 211A, it is a significant eddy current distribution area on the impeller 212A. In the area with eddy currents, the air flow between the blades here is not easy to pass through and rotates between the blades, that is, the air flow volume here is small. Therefore, setting the baffle 23A in the recirculation zone 2110A of the volute 211A has a small influence on the air performance.

[0185] In addition, although in order to further reduce the adverse influence of the baffle 23A on the air performance of the fan, the smaller the size of the baffle 23A of the present application is, the better; however, since the current cleaning blade 2121A rotates around the axis of the impeller 212A continuously during the cleaning process, the baffle 23A needs to correspond to the starting cleaning position and the ending cleaning position of the current cleaning blade 2121A during design, so that the baffle 23A can block all the flushing flows flowing out from the cleaning surface during the process of the current cleaning blade 2121A rotating from the starting cleaning position to the ending cleaning position.

[0186] As Figure 22 and Figure 25 shown, when the current cleaning blade 2121A is in the starting cleaning position (such as Figure 25When the solid blade shown is at the corresponding position), the cleaning medium ejected through the cleaning medium supply member 221A is just not blocked by the previous cleaning blade 2122A, that is, the spray line of the cleaning medium supply member 221A is tangent to the previous cleaning blade 2122A; while when the current cleaning blade 2121A is in the end cleaning position (such as Figure 25 the position corresponding to the dashed blade shown), the cleaning medium ejected through the cleaning medium supply member 221A just sprays onto the outer edge of the current cleaning blade 2121A; in other words, as Figure 25 shown, the width L of the baffle member 23A is greater than the distance S1 between the inner edges of the current cleaning blade 2121A at the start cleaning position and the end cleaning position, that is, the inner edge distance S1, so that all the flushing flows flowing out from the cleaning surface during the process of the current cleaning blade 2121A rotating from the start cleaning position to the end cleaning position are blocked by the baffle member 23A.

[0187] It should be noted that since when the current cleaning blade 2121A continues to rotate from the end cleaning position, the cleaning medium ejected through the cleaning medium supply member 221A will still spray onto the current cleaning blade 2121A until it sprays onto the next cleaning blade 2123A, that is, when the current cleaning blade 2121A rotates to the position where the previous cleaning blade 2122A is located when the current cleaning blade 2121A is in the start cleaning position, the cleaning medium ejected through the cleaning medium supply member 221A will spray onto the next cleaning blade 2123A; therefore, as Figure 25 shown, the width L of the baffle member 23A is preferably greater than or equal to the distance between the current cleaning blade 2121A and the previous cleaning blade 2122A, that is, the blade distance S2, so as to better ensure that the baffle member 23A can block all the flushing flows flowing out from the cleaning surface during the process of the current cleaning blade 2121A rotating from the start cleaning position to the end cleaning position.

[0188] In addition, considering the problem that the fluid will deflect towards the solid due to surface tension at the solid edge, that is, the flushing flow will deflect towards the direction of the current cleaning blade 2121A when flowing out from the inner edge of the current cleaning blade 2121A, so as Figure 25 shown, the left end of the baffle member 23A needs to extend further to the left to exceed the inner edge position of the current cleaning blade 2121A at the start cleaning position to prevent the flushing flow from splashing out of the volute due to deflecting towards the direction of the current cleaning blade 2121A when flowing out from the inner edge of the current cleaning blade 2121A; at the same time, considering that the rotation of the impeller 212A during the cleaning process will make the flushing flow have inertia in the rotation direction, that is, the flushing flow will deflect towards the rotation direction of the impeller 212A when flowing out from the inner edge of the current cleaning blade 2121A, so as Figure 25As shown, the right end of the baffle 23A needs to extend further to the right to exceed the inner edge position of the current cleaning blade 2121A at the end cleaning position, preventing the flushing flow from splashing out of the volute due to the deflection of the impeller 212A towards the rotation direction during rotation.

[0189] Optionally, the width L of the baffle 23A is less than three times the blade pitch S2, so that the left end of the baffle 23A does not exceed the next cleaning blade 2123A when the current cleaning blade 2121A is at the start cleaning position, and the right end of the baffle 23A does not exceed the previous cleaning blade 2122A when the current cleaning blade 2121A is at the end cleaning position, in order to reduce the impact of the baffle 23 on the air performance while avoiding the splashing of the cleaning medium.

[0190] Optionally, the length that the baffle 23A extends to the left can be less than or equal to 20% of the blade pitch S2, and the length that the baffle 23A extends to the right can be less than or equal to 50% of the blade pitch S2, so as to further shorten the width of the baffle 23A when meeting the anti-splashing requirement, which helps to further reduce the impact on the air performance.

[0191] It should be noted that the length of the baffle 23A extending from the air inlet ring 2113A is closely related to factors such as the installation position of the cleaning medium supply member 221A, the distance between the baffle 23A and the axis of the impeller 212A, and the axial dimension of the air inlet ring 2113A. For example, as Figure 24 shown, let h represent the axial length of the baffle 23A, d represent the axial width of the air inlet ring 2113A, α represent the inclination angle when the flushing flow formed by spraying the cleaning medium through the cleaning medium supply member 221A passes through the free end of the baffle 23A, and D represent the flow length of the flushing flow from the free end of the baffle 23A to the outer end face of the air inlet ring 2113A; then when the axial length of the baffle 23A satisfies h≥D*sinα - d, it can ensure that the cleaning medium sprayed through the cleaning medium supply member 221A does not splash out from the air inlet of the fan.

[0192] Preferably, the axial length h of the baffle 23A = D*sinα - d, where d represents the axial width of the air inlet ring 2113A, α represents the inclination angle when the flushing flow formed by spraying the cleaning medium through the cleaning medium supply member 221A passes through the free end of the baffle 23A, and D represents the flow length of the flushing flow from the free end of the baffle 23A to the outer end face of the air inlet ring 2113A, so as to minimize the length of the baffle 23A while avoiding the splashing of the cleaning medium out of the volute 211A and reducing the impact of the baffle 23A on the air performance.

[0193] In the above example of the present application, the baffle 23A can be an arc-shaped baffle 231A extending circumferentially along the impeller 212A on the volute 211A. At this time, the width L of the baffle 23A refers to the arc length of the arc-shaped baffle 231A. Similarly, the inner edge spacing S1 mentioned in the present application can but is not limited to referring to the circumferential distance that the inner edge moves when the current cleaning blade 2121A rotates from the starting cleaning position to the ending cleaning position; the blade spacing S2 mentioned in the present application can but is not limited to referring to the circumferential distance between the inner edges of two adjacent blades (such as the current cleaning blade 2121A and the previous cleaning blade 2122A).

[0194] Optionally, in order to further reduce the impact of the baffle 23A on the air performance, the baffle 23A of the present application can be provided with through holes having a smaller aperture (not shown in the figure), and still be able to block the cleaning medium from splashing out of the volute 211A.

[0195] It is worth mentioning that although the baffle 23A has a convex arc shape in the above first example of the present application, in other examples of the present application, the baffle 23A can also have other shapes. For example, the baffle 23A can be implemented as a strip-shaped baffle or a block-shaped baffle. In particular, the shape of the baffle 23A of the present application can also be specially designed to reuse the residual kinetic energy of the flushing flow to clean the blades again, which helps to further improve the cleaning efficiency while avoiding the splashing of the cleaning medium.

[0196] Exemplarily, in the second example of the present application, as Figure 26 shown, the baffle 23A can be a guiding baffle 232A extending bendably on the volute 211A, for guiding the flushing flow flowing out of the current cleaning blade 2121A to other blades, so as to utilize the residual kinetic energy of the flushing flow to impact other blades, which helps to improve the cleaning efficiency. It can be understood that since the guiding baffle 232A guides the flushing flow from the inside out to the blades, the flushing flow will flow towards the air outlet cavity of the volute 211A along with the air flow after impacting the blades, so as to prevent the cleaning medium from contacting the motor located in the air inlet cavity, thereby achieving the effect of protecting the motor.

[0197] Specifically, as Figure 26 shown, the guiding baffle 232A can include a drainage portion 2321A corresponding to the inner edge of the current cleaning blade 2121A and a diversion portion 2322A extending bendably outward from the drainage portion 2321A, and the free end of the diversion portion 2322A points to other blades of the impeller 212A. The drainage portion 2321A is used to collect the flushing flow flowing out of the current cleaning blade 2121A and drain it to the diversion portion 2322A; the diversion portion 2322A is used to guide the flushing flow collected via the drainage portion 2321A to other blades, so that the flushing flow impacts other blades under the action of its own residual kinetic energy, which helps to improve the cleaning efficiency.

[0198] More specifically, the drainage portion 2321A of the guiding baffle 232A has a concave arc structure, so as to reduce the kinetic energy loss of the flushing flow when it is collected, so that the residual kinetic energy of the flushing flow can be maintained at a relatively high level, and the blades can be better rinsed for the second time.

[0199] Optionally, as Figure 26 shown, the guiding portion 2322A of the guiding baffle 232A also has a concave arc structure, and the guiding portion 2322A and the drainage portion 2321A extend on the same circumference, so as to reduce the kinetic energy loss of the flushing flow during the process of flowing from the drainage portion 2321A to the guiding portion 2322A, and at the same time guide the flushing flow to the cleaning surfaces of other blades, effectively improving the cleaning efficiency.

[0200] Optionally, the free end of the guiding portion 2322A points to the blind area of other blades of the impeller 212A, so as to directly impact the blind area of other blades and further improve the cleaning efficiency.

[0201] It should be noted that, since the other blade pointed by the free end of the guiding portion 2322A is closer to the current cleaning blade 2121A, the curvature radius of the guiding baffle 232A is smaller, and the kinetic energy loss caused by the larger turning of the flushing flow is greater; while the other blade pointed by the free end of the guiding portion 2322A is farther away from the current cleaning blade 2121A, the length of the guiding baffle 232A is larger, and the kinetic energy loss caused by the longer path of the flushing flow is also greater; therefore, as Figure 26 shown, the free end of the guiding portion 2322A preferably points to the blind area of the upper three cleaning blades 2124A of the impeller 212A, so as to reduce the influence of the guiding baffle 232A on the air performance while minimizing the kinetic energy loss of the flushing flow. It can be understood that the upper three cleaning blades 2124A mentioned in the present application refer to the blades on the impeller 212A that are spaced two blades from the current cleaning blade 2121A along the rotation direction of the impeller.

[0202] Optionally, as Figure 26 shown, when the current cleaning blade 2121A is in the starting cleaning position, the free end of the guiding portion 2322A of the guiding baffle 232A points to the outer edge of the upper three cleaning blades 2124A, that is, the tangent line of the guiding portion 2322A at the free end passes through the outer edge of the upper three cleaning blades 2124A, so as to ensure that during the process of the current cleaning blade 2121A rotating from the starting cleaning position to the ending cleaning position, the impact position of the flushing flow guided by the guiding baffle 232A on the cleaning surface of the upper three cleaning blades 2124A gradually moves from the outer edge to the inner edge, so as to better clean the blind area of the blade.

[0203] According to the above embodiments of the present application, asFigure 19 As shown, the cleaning medium supply member 221A includes a moving portion 2211A extending in the circumferential direction of the rotation axis 220A and a nozzle 2212A tilted outward from the first end of the moving portion 2211A, and the angle β between the spray line of the nozzle 2212A and the tangent line of the moving portion 2211A at the first end is greater than 0° and less than or equal to 90°. In this way, compared with the solution in which the nozzle 2212A extends in the circumferential direction or tangential direction of the moving portion 2211A, when the cleaning medium supply member 221A is rotated to clean the entire blade, the average distance between the nozzle 2212A and the currently cleaned blade in this embodiment of the present application is shorter, which helps to reduce the loss of flushing force.

[0204] For example, Figure 19 As shown, the nozzle 2212A in the cleaning medium supply member 221A can also extend outwardly from the first end of the moving portion 2211A obliquely; for example, the angle between the spray direction of the nozzle 2212A and the tangent direction of the moving portion 2211A at the first end can be equal to 45°, so as to reduce the angle between the moving portion 2211A and the nozzle 2212A while shortening the spray distance, reduce the loss of water force at the corner, and improve the flushing effect. It can be understood that in this example of the present application, the equivalent rotation axis of the cleaning medium supply member 221A is parallel to the rotation axis 220A of the cleaning medium supply member 221A.

[0205] It is worth noting that Figure 19 As shown, a clearance hole 2114A is provided on the volute 211A of the fan body 21A, the rotation axis 220A of the cleaning medium supply member 221A is located outside the volute 211A, and the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to enter and exit the volute 211A through the clearance hole 2114A to form a penetration portion. In this way, when it is necessary to clean the impeller 212A, the moving part 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to extend into the volute 211A through the clearance hole 2114A and spray the cleaning medium to the current cleaning blade 2121A; and the nozzle 2212A swings around the rotation axis 220A after passing through the clearance hole 2114A (i.e., swings around the rotation axis 220A at a certain angle). The impeller 212A is reciprocated within a range of degrees (the nozzle 2212A moves back and forth between the two axial ends of the impeller 212A), so that the injection area moves back and forth between the two axial ends of the impeller 212A, thereby achieving full-area cleaning of the impeller 212A; and when the impeller 212A does not need to be cleaned, the moving portion 2211A of the cleaning medium supply member 221A is rotated around the rotation axis 220A to drive the nozzle 2212A to exit the volute 211A through the give way hole 2114A, thereby preventing the nozzle 2212A from being blocked by oil stains in the volute 211A.

[0206] Optionally, as Figure 18 , Figure 19 and Figure 22 shown, the cleaning device 22A further includes a driving mechanism 222A fixedly provided in the volute 211A and a rotating seat 223A drivably connected to the driving mechanism 222A. The rotating seat 223A includes a rotating shaft 2231A providing a rotation axis 220A and a connecting arm 2232A extending outward from the outer peripheral wall of the rotating shaft 2231A. The rotating shaft 2231 is coaxially connected to the power output end of the driving mechanism 222A, and the end of the connecting arm 2232A is fixedly connected to the moving part 2211A of the cleaning medium supply member 221A. In this way, the connecting arm 2232A can support the moving part 2211A and the nozzle 2212A away from the rotation axis 220A, so that the opening position of the relief hole 2114A can be away from the rotation axis 220A, which helps to ensure that the power output end of the driving mechanism 222A can be away from the relief hole 2114A, avoiding the driving mechanism 222A being contaminated by the oil stain leaking from the relief hole 2114A and helping to extend the service life of the driving mechanism 222A. It can be understood that in other examples of the present application, the driving mechanism 222A can also be fixedly provided in the housing 10A and still be able to drive the cleaning medium supply member 221A to swing outside the volute 211A; or, the cleaning medium supply member 221A of the present application can also be rotatably arranged in the housing 10A, which will not be elaborated herein.

[0207] Optionally, as Figure 19 shown, the end of the connecting arm 2232A is fixedly connected to the second end of the moving part 2211A, so as to reserve a sufficient long distance between the nozzle 2212A and the connecting arm 2232A, so as to widen the swing angle range of the nozzle 2212A in the case of opening a smaller relief hole 2114A and avoid structural interference between the connecting arm 2232A and the volute 211A.

[0208] Optionally, the moving part 2211A can be implemented as an arc-shaped rigid tube, so as to minimize the opening size of the relief hole 2114A while stably supporting the nozzle 2212A; for example, the moving part 2211A can be but is not limited to a hollow tube made of hard materials such as plastics, metals or polymer materials.

[0209] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0210] The above embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. Splash-proof fan, characterized in that, Comprising: A fan main body, the fan main body including a volute and an impeller rotatably disposed within the volute; A cleaning device, the cleaning device including a cleaning medium supply member disposed relative to the volute, the cleaning medium supply member being configured to spray a cleaning medium onto a current cleaning blade of the impeller to form a flushing flow on the current cleaning blade; And A flow blocking member, the flow blocking member extending from the volute into an air inlet chamber of the impeller corresponding to an inner edge of the current cleaning blade, for blocking the flushing flow flowing out from the inner edge of the current cleaning blade; The width L of the flow blocking member is greater than or equal to a blade pitch S2 and less than three times the blade pitch S2, wherein the blade pitch S2 is the pitch between the current cleaning blade and the previous cleaning blade; the width L of the flow blocking member is the dimension of the flow blocking member in the circumferential direction of the impeller.

2. The splash-proof fan according to claim 1, wherein, The flow blocking member is located in a return flow region of the volute; the return flow region is a sector region on the volute where the central angle θ is between 0° and 150°.

3. The splash-proof fan according to claim 1, characterized in that, The volute of the fan main body includes an annular wall, a volute tongue protruding outward from the annular wall, and an air inlet ring connected to axial ends of the annular wall; the flow blocking member axially extends from the air inlet ring to extend into the air inlet chamber of the impeller.

4. The splash-proof fan according to claim 3, characterized in that, The flow blocking member is integrally formed with the air inlet ring.

5. The splash-proof fan according to any one of claims 1 to 4, characterized in that, The flow blocking member is an arc-shaped baffle extending along the circumferential direction of the impeller on the volute.

6. The splash-proof fan according to any one of claims 1 to 4, characterized in that, The flow blocking member is a guiding baffle extending bendably on the volute, for guiding the flushing flow flowing out from the inner edge of the current cleaning blade to other blades of the impeller.

7. The splash-proof fan according to claim 6, characterized in that, The guiding baffle includes a drainage portion corresponding to the inner edge of the current cleaning blade and a diversion portion extending bendably outward from the drainage portion, and a free end of the diversion portion points to other blades of the impeller.

8. The splash-proof fan according to claim 7, wherein, Both the drainage portion and the diversion portion of the guiding baffle have a concave arc structure, and the drainage portion and the diversion portion extend on the same circumference.

9. The splash-proof fan according to claim 8, characterized in that, When the current cleaning blade is in a starting cleaning region, the free end of the diversion portion of the guiding baffle points to an outer edge of the upper three cleaning blades of the impeller.

10. Range hood, characterized in that, Comprising: A housing; And The splash-proof fan according to any one of claims 1 to 9, the splash-proof fan being assembled in the housing.

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