Fan cleaning device and range hood

Abstract

The present invention provides a fan cleaning device and a range hood, including: a fan, including an impeller, wherein a plurality of blades are circumferentially arranged on the impeller, the blades have inner sides, and the inner sides are concave curved surfaces; and a cleaning medium supply member having an outlet for spraying a cleaning medium onto the inner sides of the blades; the cleaning medium supply member has a spray ray, the distance between the spray ray and the axis of the impeller is R2, and the distance between the plane passing through the bottom point of the blade to be cleaned and tangent to the previous adjacent blade of the blade to be cleaned and the axis of the impeller is R1, and R1≤R2<R is satisfied, where R is the radius of the impeller, and the effect of cleaning the blades is improved on the premise of saving the cleaning medium.

Description

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 1, 2021, with application number 202111284408.2 and application name “Fan cleaning device and range hood for range hood”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of kitchen equipment, and in particular to a fan cleaning device and a range hood. Background Art

[0003] With the continuous advancement of range hood self-cleaning technology, steam cleaning or water cleaning has been widely used in the field of range hood self-cleaning. The basic principle is that the steam generator generates steam or the water pump pumps water, and the steam or water is transported to the outlet at the end of the nozzle. The steam or water is quickly ejected from the outlet to flush the impeller for cleaning.

[0004] However, when the impeller is rotating, the dynamic pressure at each point on the impeller blade is different, that is, the air flow speed is different, resulting in uneven accumulation of oil on the blade. Generally, the greater the air flow speed, the greater the air flow. Under the premise of a certain oil fume concentration, the greater the air flow speed on the blade, the more oil will be in contact, so more oil will adhere to this position. Specifically, on the blade, the closer the blade is to the outlet, the more oil will adhere to it.

[0005] In order to better extract the oil smoke, the impeller usually uses non-straight blades. There is a gap between any two adjacent blades of the impeller. When cleaning such blades, at least part of the water or steam ejected through the outlet passes directly through the gap, but does not directly impact the blades, resulting in a waste of steam or water, which in turn affects the efficiency of cleaning the oil stains on the blades. Summary of the invention

[0006] In view of this, it is necessary to provide a fan cleaning device and a range hood to address the above-mentioned problems, so as to improve the efficiency of removing oil stains on the blades by saving cleaning media.

[0007] The present invention provides a fan cleaning device, comprising:

[0008] A fan comprises an impeller, wherein the impeller is provided with a plurality of blades in a circumferential direction, wherein the blades have an inner side surface, and the inner side surface is an inner concave curved surface; and

[0009] A cleaning medium supply member having an outlet for spraying the cleaning medium onto the inner side surface of the blade;

[0010] The cleaning medium supply member has a spray line, the distance between the spray line and the axis of the impeller is R2, the distance between the plane passing through the bottom point of the blade to be cleaned and tangent to the previous adjacent blade of the blade to be cleaned and the axis of the impeller is R1, and R1≤R2<R is satisfied, where R is the radius of the impeller.

[0011] With such a setting, when the cleaning medium supply member cleans the blade, by defining the positional relationship of the outlet of the cleaning medium supply member, it is ensured that the cleaning medium sprayed through the outlet can directly impact the blade, saving the cleaning medium and thus improving the efficiency of removing oil stains on the blade.

[0012] In an embodiment of the present invention, (R - c(R - R1))<R2<R, where R is the radius of the impeller and c is a cleaning coefficient, and 0<c<1 is satisfied.

[0013] With such a setting, the cleaning coefficient is defined to further narrow the range of R2, so that when the cleaning supply member cleans the blade, the lowest point of the cleaned blade moves up, which is beneficial to improving the cleaning effect.

[0014] In an embodiment of the present invention, the cleaning coefficient c satisfies 0.03≤c≤0.62.

[0015] In an embodiment of the present invention, the cleaning coefficient c satisfies 0.09≤c≤0.39.

[0016] In an embodiment of the present invention, the cleaning coefficient c satisfies 0.09≤c≤0.19.

[0017] With such a setting, the range of the cleaning coefficient is gradually defined to make the spraying area range reasonable and gradually improve the cleaning effect.

[0018] In an embodiment of the present invention, the inner side surface of the blade is a concave arc surface.

[0019] In an embodiment of the present invention, the minimum distance between the outlet and the blade to be cleaned is L1, and 20mm≤L1≤250mm is satisfied.

[0020] With such a setting, the minimum distance between the outlet and the blade to be cleaned is defined to prevent the cleaning medium sprayed from the outlet from being dispersed during movement, resulting in a decrease in impact force, which is beneficial to improving the cleaning effect.

[0021] In an embodiment of the present invention, the blower includes a volute located outside the impeller, and a relief hole for the outlet to pass through is provided on the volute, and the cleaning medium supply member is arranged on the volute;

[0022] The cleaning medium supply component includes a penetration portion that can extend into the volute, the outlet is arranged at the penetration portion, the penetration portion passes through the clearance hole and moves relative to the volute so that the penetration portion has a working state. In the working state, the outlet of the penetration portion extends into the volute and faces the impeller, and the cleaning medium sprayed from the outlet is ejected toward the impeller and moves between the two axial ends of the impeller.

[0023] In one embodiment of the present invention, in a working state, the inner side surface of the blade being cleaned rotates toward a direction close to the outlet.

[0024] With this arrangement, the blades rotate in a direction close to the outlet, which is beneficial to increasing the impact force and thus improving the cleaning effect.

[0025] In one embodiment of the present invention, the penetration portion performs a swinging motion.

[0026] With such arrangement, the penetration part performs a swinging motion, so as to occupy a smaller space volume and achieve a larger cleaning area.

[0027] In one embodiment of the present invention, the portion of the penetration portion that passes through the clearance hole during movement is an arc segment, and the center of the arc segment is located on the rotation axis of the penetration portion.

[0028] The present invention further provides a range hood, comprising a housing and the fan cleaning device as described above, wherein the fan is arranged in the housing.

[0029] Compared with the prior art, the beneficial effect of the present invention is that by limiting the outlet position of the cleaning medium supply member, it ensures that the cleaning medium sprayed through the outlet can be sprayed onto the inner side of the blade, avoiding the waste of cleaning medium and helping to improve the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The distribution diagram of the blade pressure, shedding force and oil pollution in different areas;

[0031] Figure 2 is a cross-sectional schematic diagram of embodiment 1 of the range hood of the present invention;

[0032] Figure 3 The structural relationship between the corresponding impeller and a cleaning medium supply member in the embodiment 1 of the range hood of the present invention;

[0033] Figure 4 The structural relationship between the corresponding impeller of the range hood of the present invention and another cleaning medium supply member;

[0034] Figure 5Schematic diagram of the cooperation relationship between the outlet and the blade in Embodiment 1 of the range hood of the present invention;

[0035] Figure 6 Schematic diagram of the cooperation relationship between the impeller and the cleaning medium sprayed from the outlet in the present invention;

[0036] Figure 7 For Figure 6 Enlarged schematic diagram of part F in;

[0037] Figure 8 Schematic diagram of the relationship between three regions on a single blade in the present invention.

[0038] Figures 9A - 9F Schematic diagram of the relationship between the spraying area, the scouring area and the blind area at different cleaning surface heights;

[0039] Figures 10A - 10F Schematic diagram of the cleaning effect of the impeller at different cleaning surface heights;

[0040] Figure 11 Overall structure schematic diagram of the range hood;

[0041] Figure 12 For Figure 11 Stereoscopic structure schematic diagram after omitting the housing (the cleaning medium supply member is in the initial position);

[0042] Figure 13 For Figure 12 Longitudinal sectional view after omitting the water tank, the steam generator and the water receiving box in;

[0043] Figure 14 For Figure 12 Left view after omitting the volute and the driving device in;

[0044] Figure 15 For Figure 12 Left view after the cleaning medium supply member rotates to the middle position in;

[0045] Figure 16 For Figure 12 Left view after the cleaning medium supply member rotates to the end position in;

[0046] Figure 17 For Figure 12 Left view after the cleaning medium supply member rotates to the middle plate position when the blower in is a double-inlet blower;

[0047] Figure 18 For Figure 13 Schematic diagram of the relative position between the cleaning medium supply member and the blade during the rotation process in;

[0048] Figure 19Flow chart for self - cleaning reminder of the range hood in Embodiment 1 of the present invention;

[0049] Figure 20 Flow chart for global cleaning of the range hood in Embodiment 1 of the present invention (taking time as the sampling interval);

[0050] Figure 21 Flow chart for global cleaning of the range hood in Embodiment 1 of the present invention (taking the number of steps as the sampling interval);

[0051] Figure 22 Flow chart for collecting the oil - stained area of the range hood in Embodiment 1 of the present invention;

[0052] Figure 23 Longitudinal sectional view of the fan, cleaning medium supply member and driving device of the range hood in Embodiment 2 of the present invention in the non - working state;

[0053] Figure 24 Schematic three - dimensional structure diagram of the fan, cleaning medium supply member and driving device of the range hood in Embodiment 3 of the present invention in the non - working state;

[0054] Figure 25 Longitudinal sectional view of the fan, cleaning medium supply member and driving device of the range hood in Embodiment 3 of the present invention in the working state;

[0055] Figure 26 Longitudinal sectional view of the fan, cleaning medium supply member and driving device of the range hood in Embodiment 4 of the present invention in the non - working state;

[0056] Figure 27 Longitudinal sectional view of the fan, cleaning medium supply member and driving device of the range hood in Embodiment 4 of the present invention in the working state.

[0057] Reference numerals: 1, housing; 2, fan; 21, volute; 210, volute tongue; 211, relief hole; 212, drain hole; 22, impeller; 221, blade; 2211, injection area; 2212, scouring area; 2213, blind area; 222, middle plate; 23, driving member; 3, cleaning medium supply member; 30, penetrating portion; 301, inlet; 302, outlet; 31, rotating seat; 311, rotating shaft; 312, connecting arm; 3', cleaning medium supply member; 30', penetrating portion; 31', first transmission member; 311', first rack; 312', first gear; 313', elastic limit block; 302', outlet; 3", cleaning medium supply member; 30", penetrating portion; 31", second transmission member; 311", second rack; 312", second gear; 302", outlet; 313", limiting sleeve; 3131", bending channel; 4, driving device; 5, water tank; 6, steam generator; 7, water receiving box; 8, sensor. Detailed implementation manners

[0058] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0059] It should be noted that when a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there may also be an intermediate component. When a component is considered to be "arranged on" another component, it can be directly arranged on the other component or there may be an intermediate component at the same time. When a component is considered to be "fixed to" another component, it can be directly fixed to the other component or there may be an intermediate component at the same time.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein 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.

[0061] The range hood extracts the harmful cooking fumes generated during the cooking process through the impeller 22 that rotates at a high speed by the fan 2. After the range hood is used for a period of time, a large amount of oil stains will accumulate on the blades 221 of the impeller 22, affecting the normal operation of the range hood.

[0062] During the actual rotation of the impeller 22, the dynamic pressures at various positions on the blade 221 of the impeller 22 are different, that is, the airflow speeds at different positions of the blade 221 are also different. The greater the airflow speed, the greater the air flow rate at that position of the blade 221. Assuming that the oil smoke concentration is constant, the greater the airflow speed, the more oil stains will be in contact, and thus the more oil stains will adhere to the blade 221.

[0063] In addition, since straight blades have poor exhaust capacity, their air volume and air pressure are usually smaller under the same rotation speed and size conditions. Therefore, range hoods usually use non-straight blades, such as curved blades or arc-shaped blades. For curved blades, there may be a blind area 2211, so that the blind area 2211 position on the blade will never be cleaned, resulting in poor cleaning effect.

[0064] Since the blades 221 on the impeller 22 are evenly and spaced apart along the circumference of the impeller 22, the motion trajectory of each blade 221 on the impeller 22 is the same. For the convenience of description and understanding, when describing the blades 221 later, one of the blades 221 will be described (i.e., the blade currently being cleaned), and the axial direction of the driving member 23 driving the impeller 22 to rotate is defined as the axial direction of the blade 221, that is, the length direction of the blade 221 is defined as the axial direction of the blade 221. And define one end of the airflow inlet as the bottom end of the blade 221, refer to Figure 7 The airflow outlet 302 is at the top of the blade 221. Figure 7 Point a in .

[0065] Reference Figures 1 - 8 As shown, Figure 1 It is a distribution diagram of the shedding force and oil pollution of the blade 221 pressure in different areas. Figures 2 - 8 The blade 221 shown in FIG. 1 is in an arc shape, and the blade 221 is from the air flow inlet side (i.e., Figure 1 On the right side, Figure 8 The bottom end of the blade in the airflow outlet 302 ( Figure 1 On the left side, Figure 8 From the change of the throwing-off force on the blade 221 (the top end in FIG), it can be seen that the throwing-off force from the airflow inlet side to the airflow outlet 302 side gradually decreases, so that the oil stains closer to the airflow outlet 302 side are more difficult to be thrown off from the blade 221. In combination with the airflow velocity of the blade 221 close to the airflow outlet 302 side being greater than the airflow velocity of the inlet side, the oil stains on the blade 221 generally show a state of gradually decreasing from the top end of the blade 221 to the bottom end of the blade 221.

[0066] The present invention provides a fan cleaning device, referring to Figures 1 - 27As shown in the figure. The fan cleaning device includes a fan 2 and a cleaning medium supply member 3. The cleaning medium supply member 3 has an outlet 302, and the outlet 302 is used to spray the cleaning medium onto the blade 221 to effectively remove the oil stains on the blade 221 of the fan. This fan cleaning device can be applied to products such as range hoods.

[0067] Specifically, the fan 2 is arranged in the housing 1. The fan 2 includes a volute 21, an impeller 22 arranged in the volute 21, and a driving member 23 for driving the impeller 22 to rotate. A plurality of axially extending blades 221 are circumferentially spaced on the impeller 22. The driving member 23 can drive the impeller 22 to move in a first direction or a second direction, and the first direction is opposite to the second direction. For the convenience of understanding and description, the rotation of the impeller 22 in the first direction can be understood as the impeller 22 rotating counterclockwise, and the rotation of the impeller 22 in the second direction can be understood as the impeller 22 rotating clockwise. When cleaning the impeller 22, the impeller 22 needs to rotate. In order to increase the impact force when the cleaning medium is sprayed onto the blade 221, the inner side of the blade to be cleaned faces the direction close to the outlet 302 (i.e., referring to Figure 2 as shown in the figure, the impeller 22 rotates counterclockwise), so as to improve the cleaning effect. In the subsequent description, it will be explained by taking the example that in the state of cleaning the impeller, the blade 221 of the impeller 22 faces the direction close to the outlet 302.

[0068] As Figures 2 - 4 shown in the figure, in order to facilitate the description of the structure and shape of the blade 221, it is defined that the blade 221 has an inner side and an outer side. Among two adjacent blades 221, the inner side of one blade 221 is arranged at an interval corresponding to the outer side of the other blade 221, so as to form an air flow channel between two adjacent blades 221. It is defined that the radius of the impeller 22 is R, and the radius of the impeller 22 refers to the radius of the circular trajectory when the vertex of the blade 221 rotates. Correspondingly, the axis of the impeller 22 is the center of this circular trajectory.

[0069] Specifically, the blade 221 in the present invention has an inwardly concave inner side to form an inwardly concave curved surface. Further, the inwardly concave curved surface of the blade 221 is an inwardly concave arc surface. The outlet 302 of the cleaning medium supply member 3 is arranged facing the inner side of the blade 221, and is used to spray the cleaning medium through the outlet 302 onto the inner side of the blade 221, and form a spraying area 2212 and a spraying area 2213 adjacent to the spraying area 2212 on the inner side of the blade 221, so as to clean the oil stains on the inner side of the blade 221.

[0070] Since the water storage capacity of the water tank of the range hood is fixed, its capacity is usually designed according to the amount required for one cleaning. When part of the cleaning medium ejected through the outlet directly passes through the gap between adjacent blades, it causes waste of the cleaning medium, making the cleaning medium that could originally complete one impeller cleaning unable to achieve the cleaning effect, or to achieve the normal cleaning effect, a larger water tank or secondary water replenishment is required, resulting in an increase in the amount of cleaning medium used and a decrease in cleaning efficiency.

[0071] The cleaning medium supply member 3 has a spray line X1, and the cleaning medium ejected through the outlet 302 is sprayed along the spray line X1. The cleaning medium supply member 3 has a spray end face 3021. More specifically, the spray end face 3021 is located at one end of the outlet 302 close to the blade 221. The straight line passing through the center of the spray end face 3021 and perpendicular to the spray end face 3021 is the spray line X1. Refer to Figure 3 or Figure 4 as shown. When the outlet 302 is a linear nozzle, its spray line is the central axis of the linear nozzle. For example, Figure 3 and Figure 4 as shown, its outlets 302 are both linear nozzles, and the cleaning medium supply member has a bent section. For the present invention, regardless of whether the cleaning medium supply member or the outlet has a bent section, a straight section or other non-straight section structures, the determination of the spray line X1 is determined by the spray end face of the outlet 302. The straight line passing through the center of the spray end face and perpendicular to the spray end face is the spray line. And for the relationship between the spray end face 3021 and the horizontal plane (such as the spray end face having an angle with the horizontal plane or being perpendicular to the horizontal plane and other structural relationships), no limitation is made.

[0072] Refer to Figure 5 as shown. The impeller 22 has an axis (the axis of the impeller 22 can be understood as the center of the circular contour formed by projecting along the end face direction of the impeller 22), and the radius of the impeller 22 is R. The distance between the spray line X1 and the axis of the impeller 22 is R2, and the distance between the plane P1 passing through the bottom point of the blade 221 to be cleaned and tangent to the previous adjacent blade of the blade to be cleaned and the axis of the impeller 22 is R1. Then R1 ≤ R2 < R is satisfied. By defining the positional relationship of the outlet 302 of the cleaning medium supply member 3, it is ensured that the cleaning medium ejected through the outlet can directly impact the inner side surface of the blade, avoiding the cleaning medium from passing through the gap between adjacent blades or impacting the outer side surface of the blade, which is beneficial to improving the cleaning efficiency per unit time of the fan cleaning device while saving the cleaning medium. Further, when R2 = R1 is satisfied, it means that the spray line X1 is located in the plane P1. At this time, when cleaning the blade 22, the cleaning medium can clean to the lowest point of the blade, which is the bottom point of the blade 22.

[0073] It can be understood that for the same impeller, taking two adjacent blades as an example, there is only one plane that passes through the bottom point of the blade 221 to be cleaned and is parallel to the plane of the previous adjacent blade of the blade to be cleaned. When the relationship between adjacent blades of the impeller is determined, the corresponding R1 of the impeller is also fixed. In other words, since the impeller 22 can rotate, when two adjacent blades rotate to different positions, the plane P1 also rotates simultaneously. No matter what positions the two adjacent blades are in, the distance between the axis of the impeller and the plane P1 remains unchanged, that is, R1 remains unchanged. On the other hand, for all the blades on the impeller, since all the blades on the impeller 22 are evenly distributed along the circumferential direction of the impeller 22, the distances from the bottom points of all the blades on the impeller 22 to the axis of the impeller, where the planes (P1, P2... Pn) tangent to their corresponding previous blades are located, are all R1. Then all the planes (P1, P2... Pn) have a common inscribed circle. The center of this inscribed circle is concentric with the axis of the impeller 22, and the radius of this inscribed circle is R1.

[0074] For better understanding, the present invention will be described from another perspective. The maximum trajectory profile when the impeller 22 rotates is circular, and there are countless tangents on this circular trajectory profile. Set the tangent parallel to the spray ray as the reference line (since the impeller 22 is symmetrically arranged along the axis passing through the center of the circle, there are two tangents parallel to the spray ray. The distance from one of the tangents to the spray ray is greater than R. However, in this case, when cleaning the blade, the cleaning medium can only clean the outer side of the blade, which does not conform to the concept of the present invention. Therefore, in the present invention, a tangent parallel to and close to the spray ray is selected). The distance between the spray ray and the reference line is defined as the cleaning surface height H, then H = R - R2. The distance between the reference line and the plane P1 is defined as the maximum cleaning surface height H0, then H0 = R - R1. Combining the above, since R2 satisfies the relationship R1 ≤ R2 < R, the relationship of the cleaning surface height can be obtained as 0 < H ≤ H0. Correspondingly, when H = H0, that is, R1 = R2, it means that the spray ray is located in the plane P1. At this time, when cleaning the blade 221, the lowest point of the blade that the cleaning medium can clean is the bottom point of the blade 221. Those skilled in the relevant art should understand that when H is greater than H0, it means that some of the cleaning medium ejected through the outlet 302 will inevitably pass through the gap between adjacent blades and will not be directly sprayed on the blade, resulting in waste of the cleaning medium, and thus inevitably causing a decrease in the cleaning efficiency or the cleaning medium ejected from the outlet will inevitably be directly sprayed on the outer side of the blade, so that the blade cannot be effectively cleaned.

[0075] For further explanation, refer to Figure 5As shown, in the present invention, the spray line X1 of the cleaning medium supply pipe 2 is a horizontal spray line, and the tangent line at the highest point of the maximum trajectory profile of the blade 221 is used as the reference line X2. Correspondingly, the distance between the spray line X1 and the reference line X2 is the cleaning surface height H, and H = R - R2. Here, the cleaning surface height H refers to the adjustable range of the outlet of the cleaning medium supply member relative to the impeller in the height direction for the same impeller. Refer to Figure 5 It can be seen that in the figure, several relationships of the cleaning medium sprayed onto the blade are shown under the condition that the cleaning medium supply member 3 has different cleaning surface heights for the same impeller. Specifically, the larger the cleaning surface height H (such as Figure 5 the cleaning surface height H increases to H0 in the figure), it indicates that the smaller R2 is, that is, the larger the distance between the outlet 302 and the reference line X2. When H is less than or equal to H0, the cleaning medium sprayed through the outlet 302 can be sprayed onto the inner side surface of the blade to clean the blade. When the cleaning surface height H increases to be greater than H0 to H', some of the cleaning medium sprayed from the outlet 302 passes through the gap between adjacent blades and is not directly sprayed on the blade, resulting in waste of the cleaning medium. Even more, when the cleaning surface height H further increases to H", there is a situation where the cleaning medium sprayed through the outlet is sprayed onto the outer side surface of the blade, greatly causing waste of the cleaning medium and not achieving the effect of cleaning the oil stain on the inner side surface of the blade.

[0076] While ensuring that the cleaning medium can be directly sprayed onto the blade, further improve its cleaning effect. The distance R2 between the spray line of the cleaning medium supply member and the impeller axis further satisfies (R - c(R - R1)) < R2 < R, where c is a cleaning coefficient, satisfying 0 < c < 1, that is, 0 < H < ch0, and c satisfies 0 < c < 1. With such a setting, on the premise of ensuring that the cleaning medium sprayed from the outlet 302 can be sprayed onto the blade 221, further optimize the position of the spraying area and the ratio of the arc length of the spraying area to the arc length of the blade, so as to further improve the efficiency of removing the oil stain on the blade. It can be understood that as R2 gradually becomes larger, it indicates that the distance between the spray line X1 and the axis gradually becomes larger, and the position of the spray line X1 can represent the orientation and position of the outlet 302. Correspondingly, the orientation and position of the outlet 302 will further affect the direction and area where the cleaning medium is sprayed onto the blade.

[0077] Refer to Figures 6 - 10FAs shown, for a clearer explanation of the relationship between the blind area, impact area, and scouring area of the blade, the present invention will further illustrate their specific relationship. Here, the injection area 2212 of the blade 221 refers to the range formed when the cleaning medium is directly in contact with the inner side of the blade 221 after being ejected from the outlet 302. The injection area 2212 does not include the area formed after the cleaning medium flows along the blade 221 or drips from the blade 221 after being injected onto the blade 221. The injection area 2213 of the blade 221 refers to the area formed when the cleaning medium flows along the inner side of the blade 221 from the injection area 2212 after the cleaning medium is injected into the injection area 2212. It is worth noting that the shape of the injection area 2212 is related to the structure and shape of the outlet 302 itself and the movement mode of the outlet 302. The present invention does not limit the shape of the injection area 2212.

[0078] In addition, since the inner side of the blade 221 in the specific embodiment of the present invention is a curved surface, when the outlet 302 injects the cleaning medium towards the inner side of the blade 221, due to the structural limitations between the blades 221 of the impeller 22, there is an overlap between adjacent blades 221 in the cross-section, resulting in that when the cleaning medium is injected towards the blade 221, the cleaning medium can only fall on a partial area of the blade 221, that is, the formed injection area 2212. And a flushing blind area 2211 is formed between the top end of the blade 221 and the injection area 2212, and a scouring area 2213 is formed between the bottom end of the blade 221 and the injection area 2212. Here, the blind area 2211 refers to the area located between the injection area 2212 and the vertex of the blade 221, and the cleaning medium ejected through the outlet 302 cannot clean this area. Specifically, referring to Figure 6 or Figure 7 As shown, when the blade 221a to be cleaned moves to the dotted line position, the spray ray X1 intersects with the vertex a of the blade 221a and extends to the d point of the blade 221a. At this time, the area where the a point and the d point on the blade 221a are located is the blind area 2211. The arc length between a and d is the length S3 of the blind area 2211.

[0079] From the top to the bottom of the blade 221, the blade 221 is divided into three regions, which are successively the blind area 2211, the spraying area 2212, and the flushing area 2213. During the cleaning process of the blade 221, in order to avoid an overly large proportion of the blind area 2211, it is necessary to satisfy 0.46 ≤ (S1 + S2) / S ≤ 1, that is, 0.46 ≤ (S - S3) / S ≤ 1. In other words, when (S1 + S2) / S = 0.46, it means that the arc length S3 of the blind area 2213 to the arc length of the blade 221 is 0.54, that is, S3 / S = 0.54. When (S1 + S2) / S = 1, it means that the arc length S3 of the blind area 2211 is zero, thus avoiding an overly large ratio of the arc length of the blind area 2211 to the arc length of the blade 221, which would result in a deteriorated cleaning effect. Similarly, the arc length of the blind area 2211 here refers to the arc length corresponding to the area of the blade 221 where the blind area 2211 is located along the direction from the top to the bottom of the blade 221 on the blade 221.

[0080] To explain and understand the effect of the above limitations, the outlet 302 is arranged towards the inner side of the impeller 22 of the impeller 22, for spraying the cleaning medium, and the trajectory of the cleaning medium sprayed towards the impeller 22 is set to be linear, which can also be understood as being indicated by the spraying ray. Those skilled in the art should understand that there is no limitation on the specific cross-sectional shape of the sprayed cleaning medium here.

[0081] Furthermore, to facilitate the understanding of the formation method of the spraying area 2212, a specific arc-shaped blade will be used as an example in the following text. For example, the arc length of the arc-shaped blade is 11.11 cm, and the corresponding R1 of the impeller is 19.27 cm. It can be understood that for blades 221 of other shapes, the formation of the spraying area 2212 can be determined by reference. Specifically, during the cleaning process, the impeller 22 rotates counterclockwise, and the cleaning medium ejected from the outlet 302 can be sprayed towards the blade 221 of the impeller 22. Taking one of the blades 221 as an example, when the impeller 22 rotates one circle, the part of the cleaning medium ejected from the outlet 302 that is sprayed onto the blade 221 forms the spraying area 2212. That is, the formation of the spraying area 2212 is the spraying area formed by the cleaning medium from the starting position where it starts to be sprayed onto the blade to the ending position where it stops being sprayed onto the blade 221. This spraying area 2212 can also be called the impact area.

[0082] In order to improve the efficiency of removing oil stains on the inner side of the blade 221, the present invention aims to change the relationship among the spraying area, the scouring area, and the blind area by defining the height range of the cleaning surface, thereby improving the cleaning effect of the blade 221. Specifically, the outlet 302 is arranged facing the blade 221 and is used to spray the cleaning medium onto the inner side of the blade 221, so as to form a spraying area 2212 and a spraying area 2213 adjacent to the spraying area 2212 on the inner side of the blade 221. Define the arc length of the spraying area 2212 as S1, the arc length of the spraying area 2213 as S2, the arc length of the blind area 2211 as S3, and the arc length of the blade as S, where S = S1 + S2 + S3.

[0083] In one embodiment of the present invention, the cleaning coefficient c satisfies 0.03 ≤ c ≤ 0.62, and the corresponding cleaning surface height H satisfies 0.69 cm ≤ H ≤ 11.95 cm. While ensuring that the cleaning medium sprayed out through the outlet 302 can be sprayed onto the blade, it further increases the proportion of the arc length of the spraying area relative to the arc length of the scouring area, and at the same time reduces the proportion of the arc length S3 of the blind area 2211 relative to the arc length S of the blade 221, so as to further improve the cleaning effect.

[0084] Specifically, when the cleaning surface height H satisfies 0.69 cm ≤ H ≤ 11.95 cm, the arc length of the spraying area 2212 and the arc length of the scouring area 2213 satisfy the relationship 0.2 ≤ S1 / S2 ≤ 1.525, and the blind area arc length S3 satisfies: 0 ≤ S3 / S ≤ 0.54. Defining the relationship between the arc length of the spraying area 2212 and the arc length of the scouring area 2213 (such as 0.2 ≤ S1 / S2 ≤ 1.525 as described above) is to improve the efficiency of the cleaning medium supply member 3 in removing oil stains on the blade 221. Avoiding too small a ratio between the two causes too large a proportion of the arc length of the scouring area 2213 relative to the blade 221, resulting in too small a proportion of the arc length of the spraying area 2212, and a smaller area where the cleaning medium sprayed in the outlet 302 is sprayed onto the spraying area 2212, thus deteriorating the cleaning effect. When the ratio between the two is too large, since there will be a blind area 2211 when the outlet 302 sprays onto the blade 221, and too large a ratio means a larger blind area 2211 on the blade 221, which also deteriorates the cleaning effect of the outlet 302. Therefore, by defining the relationship among the spraying area, the scouring area, and the blind area, the purpose of improving the cleaning effect is achieved.

[0085] In one embodiment of the present invention, the cleaning coefficient c satisfies 0.09 ≤ c ≤ 0.39, and the corresponding cleaning surface height H satisfies: 2 cm ≤ H ≤ 8 cm. While ensuring that the cleaning medium sprayed out through the outlet 302 can be sprayed onto the blade, it further increases the proportion of the arc length of the spraying area relative to the arc length of the scouring area, and at the same time reduces the proportion of the arc length of the blind area relative to the arc length of the blade, so as to further improve the cleaning effect.

[0086] Specifically, when the cleaning surface height H satisfies 2 cm ≤ H ≤ 8 cm, the ratio of the arc length of the spraying area 2212 to the arc length of the spraying area 2213 satisfies 0.34 ≤ S1 / S2 ≤ 0.86, and the arc length S3 of the blind area satisfies: 0.12 ≤ S3 / S ≤ 0.42. By defining the relationship between the spraying area, the flushing area, and the blind area, the ratio of the spraying area S1 to the flushing area S2 is further increased to increase the area where the cleaning medium ejected through the outlet is directly sprayed onto the inner side of the blade, so as to improve the cleaning effect.

[0087] In one embodiment of the present invention, the cleaning coefficient c satisfies 0.09 ≤ c ≤ 0.19, and the corresponding cleaning surface height H satisfies: 2 cm ≤ H ≤ 4 cm. While ensuring that the cleaning medium ejected through the outlet 302 can be sprayed onto the blade, the ratio of the arc length of the spraying area to the arc length of the flushing area is further increased, and at the same time, the ratio of the arc length of the blind area to the arc length of the blade is reduced to further improve the cleaning effect.

[0088] Specifically, when the cleaning surface height H satisfies 2 cm ≤ H ≤ 4 cm, the ratio of the arc length of the spraying area 2212 to the arc length of the spraying area 2213 satisfies 0.34 ≤ S1 / S2 ≤ 0.50, and the arc length S3 of the blind area satisfies: 0.12 ≤ S3 / S ≤ 0.25. By defining the relationship between the spraying area, the flushing area, and the blind area, the ratio of the spraying area S1 to the flushing area S2 is further increased to increase the area where the cleaning medium ejected through the outlet is directly sprayed onto the inner side of the blade, and at the same time, the ratio of the blind area is reduced to further improve the cleaning effect.

[0089] Refer to Figures 9A - 10F As shown, for an impeller provided by the present invention, the change in the ratio of the arc length of the spraying area 2212 to the arc length of the spraying area 2213 under different cleaning surface heights, and the corresponding cleaning effect of the blade (in this embodiment, the arc length of the first blade is 11.11 cm). It should be noted that Figure 9A The cleaning effect corresponding to the cleaning surface height in Figure 10A corresponds, and so on. It should be explained that in the appendix Figures 10A - 10F Each figure shows the cleaning conditions of the same blade at different times (label 200 represents oil stain). One blade 221a represents the state of the oil stain 200 on the blade before cleaning, and the other blade 221a' represents the state of the oil stain 200 on the blade after cleaning. Refer to the following table, which shows the ratio of each area on the blade 221 under different cleaning surface heights, specifically as follows: Figures 9A - 9F The ratio of each area on the blade 221 under different corresponding cleaning surface heights is as follows:

[0090]

[0091] From the above table and in combination with Figures 10A - 10F it can be seen that when H is too large, the proportion of the cleaning blind area 2211 is too large, resulting in most areas on the blade not being cleaned, and the cleaning effect is poor. Specifically, from the cleaning effect, when the height of the cleaning surface satisfies: 0.69 cm ≤ H ≤ 11.95 cm, the cleaning effect is better.

[0092] In order to avoid the distance between the outlet 302 and the impeller 22 being too large or too small, in the present invention, the minimum distance between the outlet 302 and the blade 221 to be cleaned is L1, and it satisfies: 20 mm ≤ L ≤ 250 mm, so that the cleaning medium sprayed onto the blade 221 through the outlet 302 gradually disperses due to the surrounding air as much as possible. Because the impact force of the dispersed cleaning medium will decrease relatively when it reaches the blade, resulting in a poor cleaning effect, and by limiting the range of L, the dispersion of the water column sprayed from the outlet 302 is avoided, so as to avoid the decrease in the impact force and thus improve the cleaning effect. It can be understood that the minimum distance L1 between the outlet 302 and the blade 221 to be cleaned here refers to the distance when the blade 221 to be cleaned is at the closest position to the outlet 302. Refer to Figure 2 and Figure 7 As shown, when the blade 221a to be cleaned moves to the dotted line position, the distance between the outlet 302 and point a of the blade 221a to be cleaned.

[0093] It is worth mentioning that for the spray ray mentioned in the present invention, it can be simulated by means of laser. For example, replace the outlet position of the cleaning medium supply member with a laser emitter. When the impeller rotates, the light where the emitted laser is located is the spray ray. The area formed by the laser hitting the blade to be cleaned can be understood as the spraying area 2212 referred to in the present invention. For the same blade, the laser emitted by the laser emitter hitting the lowest point of the blade is Figure 7 point c in, and the laser emitted by the laser emitter hitting the highest point on the inner side of the blade is the highest point on the blade, which is Figure 7 point d in.

[0094] In order to clean the blade in the axial direction (arc length direction), the present invention will also introduce the moving mode of the cleaning medium supply member in the following text to clean the blade in the axial direction.

[0095] Specifically, as Figures 2 - 22 shown, it is the first preferred embodiment of the range hood of the present invention. The range hood includes a housing 1, a fan 2, a cleaning medium supply member 3, a driving device 4, a water tank 5, a steam generator 6, a water receiving box 7 and a sensor 8.

[0096] 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 12 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.

[0097] 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.

[0098] 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.

[0099] 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:

[0100] 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 2212 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;

[0101] 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.

[0102] In the present invention, the "spray area 2212" refers to the area formed once the cleaning medium sprays out from the outlet 302 and contacts the blades 221 of the impeller 22, excluding the area formed after the cleaning medium flows along the blades 221 or drips from the blades 221 after spraying onto the blades 221. The shape and size of the spray area 2212 are related to the structure and shape of the outlet 302 itself and the movement mode of the penetrating portion 30. The present invention does not limit the shape and size of the spray area 2212, as long as the spray area 2212 can clean the portion between the two axial ends of the impeller 22 through reciprocating movement when the cleaning device is working.

[0103] In addition, as Figure 13 shown, since the movement trajectory of the penetrating portion 30 at least at one end away from the outlet 302, i.e., point B, is non-linear, when the outlet 302 of the penetrating portion 30 moves to the position of the relief hole 211, the minimum distance L between the end of the penetrating portion 30 away from the outlet 302, i.e., point B, and the volute 21 is less than the length of the penetrating portion 30. In this way, the cleaning medium supply member 3 can cover a larger cleaning range within a smaller activity space. On the one hand, it occupies less space, and on the other hand, the modification of the original structure of the fan is small (i.e., only a relief hole 211 for the penetrating portion 30 to pass through needs to be opened on the volute 21), without affecting the performance of the fan.

[0104] In order to ensure that the injection area 2212 where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 reciprocates between the two axial ends of the impeller 22, the rotation axis of the penetrating part 30 is arranged at an angle with the central axis of the impeller 22 (that is, the included angle between the rotation axis of the penetrating 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 penetrating part 30 is not parallel and does not overlap with the central axis of the impeller 22). The reason is that when the rotation axis of the penetrating part 30 is parallel or overlaps with the central axis of the impeller 22, the injection area 2212 where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 will reciprocate along the circumferential direction of the impeller 22. In this way, when the rotating penetrating part 30 sprays steam onto the rotating impeller 22, the above-mentioned injection area 2212 can only cover a very narrow annular surface on the outer periphery of the impeller 22 and cannot cover other positions of the impeller 22 along the axis. The rotation of the penetrating part 30 loses its meaning because in this case, the same cleaning effect can be achieved even if the penetrating part 30 does not rotate. In this embodiment, the rotation axis of the penetrating 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 penetrating part 30 is located is arranged parallel to the central axis of the impeller 22. In this way, the injection area 2212 where the cleaning medium ejected from the outlet 302 of the penetrating part 30 hits the blade 221 will move along the axis 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 2212 is completely 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 2212 will be relatively extended.

[0105] In order to avoid interference between the penetrating part 30 and the volute 21 during the rotation process when the aperture of the relief hole 211 is small, the part of the penetrating part 30 that moves through the relief hole 211 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 penetrating 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 penetrating 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.

[0106] In addition, through experimental verification, as Figure 17As 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 blade 221 passes 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 2212 corresponds to the middle disc 222 (that is, the spraying area 2212 moves to the position where the blade 221 passes 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.

[0107] To ensure that the flushing time for each point on the blade 221 is basically the same, the reciprocating movement of a point A in the axial direction between the two ends of the impeller 22 in the axial direction where the cleaning medium is sprayed onto the spraying area 2212 at the impeller 22 is set as a uniform motion, and the movement of the penetrating part 30 is preferably set as a variable motion. The derivation formula is as follows:

[0108] As Figure 18 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. Selecting 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:

[0109]

[0110] Since v0t = h tanθt, that is

[0111] Therefore,

[0112] Among them, the point A where the cleaning medium is sprayed onto the spraying area 2212 at the impeller 22 is defined as being ejected from the point A0 at the outlet 302 of the penetrating part 30;

[0113] ω is the rotational speed of the penetrating part 30;

[0114] θ is the rotation angle of the penetrating part 30;

[0115] 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 2212 is sprayed;

[0116] v0 is the moving speed of the point A in the spraying area 2212.

[0117] In this embodiment, when t = 0, θ = 0.

[0118] The water tank 5 has a water inlet end and a water outlet end, and is used for storing water. In this embodiment, the top of the water tank 5 has an opening as the water inlet end.

[0119] 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.

[0120] 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 for receiving 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.

[0121] 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 women with less strength feel strenuous to operate, 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.

[0122] The sensor 8 is installed at a position near the outlet 302 of the passing part 30 and is used to detect the amount of oil stains at various positions along the axial direction between the two end parts 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. After the oil stain adsorbs water, its surface humidity is much higher than that of the metal blade surface. At this time, the humidity sensor can detect the oil stain with high water content for oil stain positioning. Specifically, since the sensor 8 will rotate synchronously during the rotation of the passing part 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 heat conduction coefficients of the metal and the oil stain are different, within a short time of centrifugal throwing off, there will be an obvious temperature difference between the metal surface and the oil stain surface. The oil stain can be identified by the thermal imaging principle to achieve the purpose of detecting the oil stain.

[0123] Of course, the above-mentioned 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 swings under the drive of the driving device 4, so that the outlet 302 of the moving portion has an arc-shaped movement 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 large 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.

[0124] The working principle of this embodiment is as follows:

[0125] (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 at the rotating impeller 22, so that the spraying area 2212 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:

[0126] ① As Figure 14 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;

[0127] ② As Figure 15 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 2212 of the steam slowly moves forward;

[0128] ③ As Figure 16 shown, when the spraying area 2212 reaches the frontmost end of the blade 221, the driving device 4 changes the rotation direction to start secondary flushing of the blade 221;

[0129] ④ Until the spraying area 2212 returns to the rearmost end of the blade 221, the driving device 4 changes the rotation direction again to repeat the above movement;

[0130] After the cleaning is completed and in the non-working state, the cleaning medium supply member 3 rotates outward to completely disengage from the relief hole 211, so that the outlet 302 of the penetrating portion 30 exits the volute 21, trying to avoid 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 is still likely to rush through the relief hole 21 towards the outlet 302 of the penetrating portion 30, causing its blockage;

[0131] (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 started to detect the grease on the blades 221, and the detection results are recorded in the database;

[0132] 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 on the surface weakens the cleaning force of the high-pressure jet instead;

[0133] (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 large oil stain areas;

[0134] Since the current self-cleaning technology requires users to add water by themselves, if too much water is added each time, it will form a burden and risk for users to add water, store waste water, and pour waste water. Moreover, generally, the impeller 22 cannot be completely cleaned through a single complete cleaning. Regional cleaning can give priority to cleaning the positions with more oil adhesion points, thus effectively improving the cleaning rate.

[0135] As Figure 19 shown, the above range hood performs self-cleaning prompts through the following method before self-cleaning:

[0136] 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;

[0137] S002. Judge whether the values of T1 and T2 meet: T1 > D and T2 > H. If so, enter S003; if not, enter S005;

[0138] S003. Light up the self-cleaning prompt and enter S004;

[0139] S004. Judge whether the user starts self-cleaning. If so, enter S005; if not, return to S003;

[0140] S005. Turn off the self-cleaning prompt and end;

[0141] Among them, D is the maximum allowable cleaning interval time under normal conditions. Grease is easily removed when it first adheres to the surface of the impeller. 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;

[0142] H is the maximum allowable cumulative usage time under normal conditions. For some users who use less frequently, this scheme defines the cumulative time duration from the last cleaning to the present. For users who use 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.

[0143] The control method for the self-cleaning operation of the above-mentioned range hood includes the following steps:

[0144] Step 1: Spray the cleaning medium from the moving cleaning medium supply member 3 onto the rotating impeller 22, so that the spraying area 2212 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;

[0145] Specifically, as Figure 20 shown, the above Step 1 is implemented by the following method:

[0146] 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;

[0147] 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;

[0148] S103: Collect the values of t and θ, and enter S104;

[0149] S104: Judge whether the θ value satisfies: θ≥θmax. If so, enter S106; if not, enter S105;

[0150] S105: Judge whether the t value satisfies: t - ta≥Δt. If so, return to S102; if not, return to S103;

[0151] 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;

[0152] S107: Collect the values of t and θ, and enter S108;

[0153] S108: Judge whether the θ value satisfies: θ≤0. If so, enter S110; if not, enter S109;

[0154] S109. Determine whether the t value satisfies: t - tb ≥ Δt. If so, return to S106; if not, return to S107;

[0155] S110. Determine whether the t value satisfies: t ≥ t0. If so, proceed to S111; if not, return to S102;

[0156] S111. Turn off the driving member 23 and the driving device 4, and end;

[0157] Wherein, θmax is the rotation angle when the injection area 2212 of the cleaning medium supply member 3 is located at the forefront of the impeller 22, and its value is preferably 30 - 75°;

[0158] 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 at the injection area 2212 where the cleaning medium shoots towards the impeller 22 and the two axial ends of the impeller 22 is a uniform motion. This value is preferably 1 - 100 ms;

[0159] t0 is the total global cleaning duration, and its value is preferably 10 - 20 min;

[0160] 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 - 1°.

[0161] In addition, a stepper motor can also be used as the driving device 4. In this way, as Figure 21 shown, the above step one can be realized by the following method:

[0162] 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 proceed to S102;

[0163] S102. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate forward, ω = f(θ), record na, and proceed to S103;

[0164] S103. Collect the n and θ values, and proceed to S104;

[0165] S104. Determine whether the θ value satisfies: θ ≥ θmax. If so, proceed to S106; if not, proceed to S105;

[0166] S105. Determine whether the n value satisfies: n - na ≥ Δn. If so, return to S102; if not, return to S103;

[0167] S106. Start the driving device 4 to drive the cleaning medium supply member 3 to rotate backward, ω = f(t), record nb, and proceed to S107;

[0168] S107. Collect the n and θ values, and proceed to S108;

[0169] S108. Determine whether the θ value satisfies: θ ≤ 0. If so, proceed to S110; if not, proceed to S109.

[0170] S109. Determine whether the n value satisfies: n - nb ≥ Δn. If so, return to S106; if not, return to S107.

[0171] S110. Determine whether the t value satisfies: t ≥ t0. If so, proceed to S111; if not, return to S102.

[0172] S111. Turn off the driving member 23 and the driving device 4, and end.

[0173] Wherein, n is the number of steps of the stepping motor. Since the stepping angle of the stepping motor = 360° / (number of rotor teeth * n), therefore, when n is determined, the value of θ can be calculated.

[0174] Δn is the step interval between two adjacent speed changes of the stepping motor, and this value is preferably 1 - 200.

[0175] Step Two: Generate a centrifugal force by rotating the impeller 22, thereby removing the cleaning medium and grease on the surface of the impeller 22.

[0176] Specifically, the above Step Two is achieved by the following method: Start the driving member 23, set the rotational speed at 1500 - 3000 r / min, perform dehydration and deoiling for 0.1 - 10 min, and then turn off the driving member 23.

[0177] Step Three: Detect the amount of oil stain 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.

[0178] Specifically, as Figure 22 shown, the above Step Three is achieved by the following method:

[0179] 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.

[0180] 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.

[0181] S303. Determine whether the t value satisfies: t - tc ≥ Δt'. If so, proceed to S304; if not, proceed to S307.

[0182] S304. Collect φ, record tc, and proceed to S305.

[0183] S305. Determine whether the φ value satisfies: φ ≥ φ0. If yes, proceed to S306; if no, proceed to S307;

[0184] S306. Record θn, set n = n + 1, and proceed to S307;

[0185] S307. Collect the t and θ values and proceed to S308;

[0186] S308. Determine whether the θ value satisfies: θ ≥ θmax. If yes, proceed to S3010; if no, proceed to S309;

[0187] S309. Determine whether the t value satisfies: t - ta ≥ Δt. If yes, return to S302; if no, return to S303;

[0188] S3010. Turn off the drive device 4 and the sensor 8, and end;

[0189] Among them, θmax is the rotation angle when the injection area 2212 of the cleaning medium supply member 3 is at the foremost end of the impeller 22, and its value is preferably 30 - 75°;

[0190] 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 2212 of the cleaning medium hitting one of the points A on the impeller 22 along the axial direction between the two axial ends of the impeller 22 is a uniform motion, and this value is preferably 1 - 100 ms;

[0191] 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;

[0192] φ0 is the maximum oil stain characterization value allowed in the normal state. In this embodiment, its value is preferably 20 - 100% (humidity);

[0193] Step Four. Spray the cleaning medium onto the rotating impeller 22 by moving the cleaning medium supply member 3, so that the injection area 2212 of the cleaning medium reciprocates axially between the front end and the rear end of the oil-stained area to perform area cleaning on the oil-stained area.

[0194] 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 consecutive 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, 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.

[0195] like Figure 23 FIG. 2 is a second preferred embodiment of the range hood of the present invention. The difference from the first embodiment is that:

[0196] In this embodiment, Figure 23 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.

[0197] like Figure 24 and Figure 25 The third preferred embodiment of the range hood of the present invention is shown in FIG. The difference from the second embodiment is that:

[0198] In this embodiment, the cleaning medium supply member 3' is in the shape of a vortex, wherein the rear section is a penetration portion 30', and the cleaning medium supply member 3' is transmission-connected to the power output end of the driving device 4 through a first transmission assembly 31'. The first transmission assembly 31' includes a first rack 311', a first gear 312' and an elastic stop block 313'. Specifically, the first rack 311' is arranged on the first side of the cleaning medium supply member 3' along the extension 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 stop 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 sandwiched between the first gear 312' and the elastic stop block 313'.

[0199] The driving device 4 is started to drive the first gear 312' to rotate. Since the first rack 311' is meshed with the first gear 312', the first rack 311' drives the cleaning medium supply member 3' to make a spiral curved motion relative to the volute 21.

[0200] The working principle of this embodiment is as follows:

[0201] (1) Figure 24 As shown, in the non-working state, the outlet 302' of the penetration portion 30' exits the volute 21, avoiding the risk of clogging the outlet 302' of the penetration portion 30" due to being placed in the volute 21 for a long time;

[0202] (2) When cleaning is required, the driving device 4 drives the cleaning medium supply member 3' to make a spiral curvilinear motion relative to the volute 21, so that the outlet 302' of the penetration portion 30' extends into the volute 21 and faces the blades 221 of the impeller 22, as shown in FIG. Figure 25 As shown, in the working state, the rotation direction of the driving device 4 is periodically changed, so that the cleaning medium ejected from the outlet 302' of the penetration portion 30' is ejected to the injection area 2212 at the blade 221 and reciprocates between the two axial ends of the impeller 22, thereby cleaning the impeller 22.

[0203] like Figure 26 and Figure 27 The fourth preferred embodiment of the range hood of the present invention is shown in FIG. The difference from the second embodiment is that:

[0204] In this embodiment, the clearance hole 211 is opened on the end wall of the volute 21, and the cleaning medium supply member 3" is an elastic strip-shaped pipe, wherein the rear section is the penetration portion 30", and the cleaning medium supply member 3" is transmission-connected with the power output end of the driving device 4 through the second transmission assembly 31", and 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 extension direction of the cleaning medium supply member 3", and the adjacent ends of the two 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.

[0205] Start the driving device 4 to drive the rotation of the second gear 312". 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 portion 30" moves in a straight line. One end of the penetrating portion 30" away from the outlet 302" moves along the bending channel 3131", and its movement trajectory is a non-linear shape. The non-linear shape can be a curve, a broken line, etc., and can be a regular trajectory or an irregular trajectory, as long as it is ensured that it is not a straight-line movement.

[0206] The working principle of this embodiment is as follows:

[0207] (1) As Figure 26 shown, in the non-working state, the outlet 302" of the penetrating portion 30" exits the volute 21 to avoid 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. And the cleaning medium supply member 3" is arranged along the bending channel 3131" under the limitation of the limiting sleeve 313", reducing the occupied space;

[0208] (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 portion 30" extends into the volute 21 and faces the blade 221 of the impeller 22. As Figure 27 shown, in the working state, the cleaning medium supply member 3" extending into the volute 21 will restore its long strip structure under its own elastic force. By periodically changing the rotation direction of the driving device 4, the injection area 2212 where the cleaning medium ejected from the outlet 302" of the penetrating 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; 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", reducing the occupied space.

[0209] Those of ordinary skill in the art of this technology should recognize that the above embodiments are only used to illustrate the present invention and are not used as limitations to the present invention. As long as appropriate changes and variations are made to the above embodiments within the scope of the essential spirit of the present invention, they fall within the scope of protection required by the present invention.

Claims

1. A fan cleaning device, characterized in that, Comprising: A blower, including an impeller, wherein a plurality of blades are circumferentially arranged on the impeller, and the blades have inner sides, and the inner sides are concave curved surfaces; And A cleaning medium supply member, having an outlet for jetting a cleaning medium onto the inner side of the blade; The cleaning medium supply member has a spray line, the distance between the spray line and the axis of the impeller is R2, the distance between the plane passing through the bottom point of the blade to be cleaned and tangent to the previous adjacent blade of the blade to be cleaned and the axis of the impeller is R1, and R1≤R2<R is satisfied, where R is the radius of the impeller.

2. The fan cleaning device according to claim 1, characterized in that, R2 satisfies: (R - c(R - R1))<R2<R, where c is a cleaning coefficient and satisfies 0<c<1.

3. The fan cleaning device according to claim 2, wherein The cleaning coefficient c satisfies 0.03≤c≤0.

62.

4. The fan cleaning device according to claim 3, characterized in that, The cleaning coefficient c satisfies 0.09≤c≤0.

39.

5. The fan cleaning device according to claim 3, wherein, The cleaning coefficient c satisfies 0.09≤c≤0.

19.

6. The fan cleaning device according to claim 1, characterized in that, The inner side of the blade is a concave arc surface.

7. The fan cleaning device according to claim 1, wherein The minimum distance between the outlet and the blade to be cleaned is L1, and 20mm≤L1≤250mm is satisfied.

8. The fan cleaning device according to any one of claims 1 to 7, characterized in that, The blower includes a volute located outside the impeller, and a relief hole for the outlet to pass through is provided on the volute, and the cleaning medium supply member is arranged on the volute; The cleaning medium supply member includes a penetrating portion that can extend into the volute, the outlet is provided on the penetrating portion, and the penetrating portion passes through the relief hole and moves relative to the volute, so that the penetrating portion has a working state. In the working state, the outlet of the penetrating portion extends into the volute and faces the impeller, and the spraying area where the cleaning medium sprayed from the outlet hits the impeller moves between the two end portions in the axial direction of the impeller.

9. The fan cleaning device according to claim 8, wherein, In the working state, the inner side of the blade to be cleaned rotates towards the direction close to the outlet.

10. The fan cleaning device according to claim 9, wherein, The penetrating portion makes a swinging motion.

11. The fan cleaning device according to claim 10, characterized in that, The portion of the penetrating portion passing through the relief hole during movement is an arc segment, and the center of the arc segment is located on the rotation axis of the penetrating portion.

12. An oil fume suction machine, characterized in that, Comprising a housing and a blower cleaning device according to any one of claims 1 to 11, and the blower is arranged in the housing.

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