Fan and cleaning robot

Abstract

The utility model relates to the technical field of air supply equipment, and discloses a fan and a cleaning robot, the fan comprises a volute and an impeller arranged in the volute, the impeller comprises a hub, a wheel cover and a plurality of blades arranged between the hub and the wheel cover, and the blades are arranged along the chord length direction of the blades from the front edges of the blades to the rear edges of the blades. The thicknesses of the blades are gradually increased and then gradually reduced, and the chord length of the blades is the linear distance between the front edges of the blades and the rear edges of the blades. In the embodiment, in the process that airflow flows from the front edge of the blade to the rear edge of the blade through the arrangement, the change of the flow area of the airflow is uniform, the airflow can flow by being tightly attached to the surface of the blade, flow separation in an impeller runner and pneumatic noise generated by the flow separation are reduced, and the efficiency of the fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, in particular to a fan and a cleaning robot. Background Art

[0002] In recent years, with the continuous improvement of economic level, people's requirements for home environment are getting higher and higher. The application of sweeping robots in households as a lazy welfare is gradually becoming common. The sweeping robots can automatically complete the floor cleaning tasks and reduce the cleaning work of users.

[0003] Cleaning robots are usually equipped with fans to perform vacuuming operations. In order to meet the vacuuming operation requirements of cleaning robots, cleaning robots usually use higher-power fans, which also makes the fans usually produce louder noises during operation, affecting the user experience. Utility Model Content

[0004] The embodiments of the utility model aim to provide a fan and a cleaning robot to solve the technical problem of high noise during the operation of the fan in the prior art.

[0005] The embodiment of the utility model adopts the following technical solution to solve the technical problem: a fan is provided, including a volute and an impeller arranged in the volute;

[0006] The impeller includes a hub, a wheel cover, and a plurality of blades arranged between the hub and the wheel cover. Along the chord length direction of the blade and from the leading edge of the blade to the trailing edge of the blade, the thickness of the blade first gradually increases and then gradually decreases, wherein the chord length of the blade is the straight-line distance from the leading edge of the blade to the trailing edge of the blade.

[0007] In some embodiments, the thickest part of the blade is located in the interval of 0.65-0.8 chord length of the blade.

[0008] In some embodiments, the volute includes a volute tongue, the outlet diameter of the impeller is D1, the base circle diameter of the volute is D2, and the ratio of D2 to D1 is between 1.1-1.4, wherein the base circle of the volute is tangent to the volute tongue.

[0009] In some embodiments, the radius of the volute tongue is R0, and the ratio of R0 to D2 is between 0.025 and 0.1.

[0010] In some embodiments, the diameter of the wheel hub is D3, the diameter of the wheel cover is D4, and D4 is larger than D3.

[0011] In some embodiments, the height of the blades gradually decreases along the direction from the impeller inlet to the impeller outlet;

[0012] The height of the blade at the impeller inlet is B1, the height of the blade at the impeller outlet is B2, and the ratio of B1 to B2 is between 1.2 and 2.

[0013] In some embodiments, the inlet radius of the impeller is R1, the outlet radius of the impeller is R2, the ratio of R2 to R1 is between 1.5 and 3, and the product of R1 and B1 is less than the product of R2 and B2.

[0014] In some embodiments, the inlet angle of the blade is β1, the outlet angle of the blade is β2, and β2 is greater than or equal to β1.

[0015] In some embodiments, a connecting ring is provided on a side of the wheel hub facing away from the wheel cover, and the connecting ring is used to fix the bar magnetic ring.

[0016] The embodiments of the utility model also adopt the following technical solution to solve the technical problem: a cleaning robot is provided, comprising a body and a fan as described in any of the above embodiments, wherein the fan is installed in the body.

[0017] Compared with the prior art, in the fan and cleaning robot provided by the embodiments of the utility model, along the chord length direction of the blade and from the leading edge of the blade to the trailing edge of the blade, the thickness of the blade first gradually increases and then gradually decreases, so that in the process of the airflow flowing from the leading edge of the blade to the trailing edge of the blade, the flow area of ​​the airflow changes more evenly, and the airflow can flow close to the surface of the blade to reduce the flow separation in the impeller flow channel and the aerodynamic noise generated thereby, thereby improving the efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a fan provided by one embodiment of the utility model;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the impeller in the embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the impeller without the wheel cover in the embodiment of the utility model;

[0022] Figure 4It is a schematic diagram of the structure after the volute and the impeller are assembled in the embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the impeller in the embodiment of the utility model;

[0024] Figure 6 is a top view of the impeller in the embodiment of the utility model;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the impeller in another viewing angle in the embodiment of the utility model;

[0026] Figure 8 It is a three-dimensional structural schematic diagram of the cleaning robot in the embodiment of the utility model.

[0027] The utility model embodiment of the accompanying drawings:

[0028] 100 hand crank; 100 fan; 101 air inlet; 102 air outlet; 103 mounting hole; 10 volute; 11 volute tongue; 12 upper shell; 13 lower shell; 20 impeller; 21 hub; 210 connecting ring; 22 wheel cover; 23 blades; 201 impeller inlet; 202 impeller outlet; 203 impeller flow channel; 231 leading edge; 232 trailing edge; 30 air inlet structure; 200 cleaning robot. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connecting" another element, it can be directly on another element, or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "upper end", "lower end", "top" and "bottom" used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used 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.

[0031] The following will be combined with the attached Figures 1 to 8 The fan and cleaning robot provided in the embodiments of the utility model are described in detail.

[0032] See also Figures 1 to 3 , Figure 1 is a three-dimensional structural schematic diagram of a fan 100 provided in an embodiment of the utility model. Figure 2 2 is a schematic diagram of the three-dimensional structure of the impeller 20 in the embodiment of the utility model. Figure 3 It is a schematic structural diagram of the impeller 20 without the wheel cover 22 in the embodiment of the utility model.

[0033] The embodiment of the utility model provides a fan 100, which includes a volute 10 and an impeller 20 disposed in the volute 10. The impeller 20 includes a hub 21, a wheel cover 22, and a plurality of blades 23 disposed between the hub 21 and the wheel cover 22. Along the chord length direction of the blade 23 and from the leading edge 231 of the blade 23 to the trailing edge 232 of the blade 23, the thickness of the blade 23 first gradually increases and then gradually decreases, wherein the chord length of the blade 23 is the straight-line distance between the leading edge 231 of the blade 23 and the trailing edge 232 of the blade 23.

[0034] Specifically, the fan 100 in the embodiment of the utility model can be applied to the cleaning robot 200 but is not limited thereto. For example, the fan 100 can also be applied to various electrical appliances such as air purifiers and air conditioners.

[0035] like Figure 1 As shown, the fan 100 is provided with an air inlet 101 and an air outlet 102. Optionally, the fan 100 also includes a motor (not shown), which is transmission-connected to the impeller 20. The impeller 20 can be driven to rotate by the motor, and under the action of the impeller 20, the airflow is transmitted from the air inlet 101 to the air outlet 102.

[0036] The impeller 20 has an impeller inlet 201, an impeller flow channel 203 and an impeller outlet 202. The impeller inlet 201 is connected to the air inlet 101, and the impeller outlet 202 is connected to the air outlet 102. The impeller flow channel 203 is located between the impeller inlet 201 and the impeller outlet 202, and is respectively connected to the impeller inlet 201 and the impeller outlet 202. After the motor is started, the motor drives the impeller 20 to rotate, and the airflow at the air inlet 101 can flow through the impeller inlet 201, the impeller flow channel 203 and the impeller outlet 202 in sequence, and flow out from the air outlet 102.

[0037] The impeller 20 includes a hub 21, a wheel cover 22 and a plurality of blades 23. The hub 21 and the wheel cover 22 are fixedly connected. Optionally, the hub 21 and the wheel cover 22 can be fixedly connected by hot melt connection, ultrasonic welding or riveting. The hub 21 and the wheel cover 22 can both present a roughly ring-shaped structure. The plurality of blades 23 can be evenly spaced and arranged along the circumferential direction of the hub 21. Each adjacent two blades 23 cooperate with the hub 21 and the wheel cover 22 to enclose a plurality of impeller flow channels 203.

[0038] The blade 23 can be designed in a multi-segment line manner. The leading edge 231 of the blade 23 is the edge in the cross section of the blade 23 that first contacts the airflow. The leading edge 231 can be streamlined to guide the airflow to smoothly adhere to the surface of the blade 23. The trailing edge 232 of the blade 23 is the edge in the cross section of the blade 23 where the fluid finally leaves the blade 23 after flowing through the blade 23. The trailing edge 232 can be rounded to facilitate the fluid to smoothly separate from the surface of the blade 23, reducing vortex phenomena and energy loss.

[0039] From the leading edge 231 to the trailing edge 232 of the blade 23 , the cross-sectional thickness (along the cross section perpendicular to the axial direction of the impeller 20 ) of the blade 23 first gradually increases and then gradually decreases.

[0040] In this embodiment, by setting the blade 23 to be thin at both ends and thick in the middle, the above setting can, on the one hand, allow the airflow to have an adaptive flow area at the impeller inlet 201 and the impeller outlet 202, thereby preventing the flow area of ​​the airflow at the impeller inlet 201 and the impeller outlet 202 from being too small, thereby increasing the flow resistance and generating noise. On the other hand, it can ensure that the flow area of ​​the airflow changes more evenly during the process of the airflow flowing from the leading edge 231 of the blade 23 through the impeller flow channel 203 to the trailing edge 232 of the blade 23, and the airflow can flow smoothly close to the surface of the blade 23, thereby reducing the flow separation in the impeller flow channel 203 and the aerodynamic noise generated thereby, thereby improving the efficiency of the fan 100.

[0041] More specifically, the thickness of the blade 23 first gradually increases and then gradually decreases, that is, the leading edge 231 of the blade 23 is thinner, which can avoid the smaller flow area at the impeller inlet 201 caused by the thicker leading edge 231 of the blade 23, affecting the smooth entry of the airflow and the subsequent flow efficiency. The gradual increase in the thickness of the blade 23 first helps to optimize the distribution of the airflow. This gradually increasing thickness can help the airflow better adhere to the surface of the blade 23, reduce the formation of turbulence, reduce flow separation, and thus reduce resistance and noise. The thickness of the blade 23 then gradually decreases to ensure that the size of the impeller outlet 202 is not too small, avoiding the flow area at the impeller outlet 202 being too small to increase the flow resistance and generate noise.

[0042] In some embodiments, the thickest part of the blade 23 is located in the range of 0.65-0.8 chord length of the blade 23, and the thickest part of the blade 23 is located at the position of 0.65-0.8 chord length of the blade 23. For example, the thickest part of the blade 23 can be located at the positions of 0.65, 0.69, 0.75, and 0.8 chord length of the blade 23. In other words, the thickest part of the blade 23 is located in the area where the rear half of the blade 23 is located, that is, in the area where the blade 23 is closer to the trailing edge 232 of the blade 23, so that the flow area of ​​the airflow gradually decreases from the leading edge 231 of the blade 23 to the thickest part of the blade 23, so as to avoid the flow separation caused by the excessive flow area of ​​the airflow near the trailing edge 232 of the blade 23. In the process of the thickness of the blade 23 gradually decreasing, it can be ensured that the size of the impeller outlet 202 is not too small compared with the impeller inlet 201, so as to avoid the flow area of ​​the impeller outlet 202 being too small to increase the flow resistance and generate noise.

[0043] In some embodiments, the number of blades 23 may be between 7 and 13 but is not limited thereto. For example, the number of blades 23 may be 7, 9, 12, and so on.

[0044] Optionally, the number of blades 23 is an odd number, and the design of the odd number of blades helps to balance the radial force generated during the operation of the impeller 20. During the rotation of the blades 23, the radial force generated by the odd number of blades can be more evenly distributed, which helps to reduce the overall vibration of the fan 100.

[0045] In some embodiments, the surface of one side of the hub 21 close to the blades 23 is streamlined to facilitate the guidance of the airflow, reduce the eddy current and separation of the fluid at the junction of the hub 21 and the blades 23, reduce the turbulence and vibration generated when the airflow passes through the hub 21, thereby reducing the noise during the operation of the fan 100 and improving the efficiency of the fan 100.

[0046] In some embodiments, the inner surface of the volute 10 is also streamlined to maintain the continuity of the airflow and reduce vortices, thereby reducing energy loss and noise during the airflow process.

[0047] See also Figure 4 , and refer back to Figure 3 , Figure 4 It is a schematic diagram of the structure after the volute 10 and the impeller 20 are assembled.

[0048] In some embodiments, the volute 10 includes a volute tongue 11, the outlet diameter of the impeller 20 is D1, the base circle diameter of the volute 10 is D2, and the ratio of D2 to D1 is between 1.1-1.4, that is, D2=(1.1-1.4)*D1, wherein the base circle of the volute 10 is tangent to the volute tongue 11.

[0049] like Figure 4As shown, the volute tongue 11 is arranged on the volute 10 and close to the air outlet 102 of the fan 100. The volute tongue 11 is generally in a tongue-shaped structure. The main function of the volute tongue 11 is to prevent the airflow from the impeller outlet 202 from circulating inside the volute 10 and returning to the impeller inlet 201, ensuring that the airflow flows along the designed path and finally flows to the air outlet 102. This can improve the efficiency of gas flow and avoid unnecessary energy loss.

[0050] The base circle of the volute 10 is a circle formed by taking the geometric center of the volute 10 as the origin and being tangent to the inner wall of the volute tongue 11. The ratio of the base circle diameter D2 of the volute 10 to the outlet diameter D1 of the impeller 20 is in the range of 1.1-1.4, for example, the ratio of D2 to D1 can be 1.1, 1.25, 1.4, etc.

[0051] In this embodiment, by configuring D2 and D1 to be in an appropriate ratio, the impeller outlet 202 can be kept at a suitable distance from the volute tongue 11, thereby ensuring a higher efficiency of the fan 100 and significantly reducing the noise caused by dynamic and static interference in the flow channel of the volute 10.

[0052] In other words, if the ratio between the base diameter D2 of the volute 10 and the outlet diameter D1 of the impeller 20 is low, the distance between the impeller outlet 202 and the volute tongue 11 is small, which will increase the flow resistance of the airflow, causing strong turbulence and eddy currents when the airflow passes through the gap between the volute tongue 11 and the impeller 20, causing eddy current noise. If the ratio between the base diameter D2 of the volute 10 and the outlet diameter D1 of the impeller 20 is large, the distance between the impeller outlet 202 and the volute tongue 11 is large, which will easily cause the flow path of the airflow inside the volute 10 to be too long or the streamline to be not smooth, and part of the kinetic energy cannot be effectively converted, resulting in airflow energy loss, reducing the efficiency of the fan 100. Therefore, in this embodiment, the ratio of D2 to D1 is configured to be in the range of 1.1-1.4, which can better balance the noise and energy efficiency of the fan 100, so that it can maintain a high fan 100 efficiency while maintaining a low operating noise.

[0053] like Figure 3 As shown, in some embodiments, the inlet diameter of the impeller 20 is D0, and the ratio of the outlet diameter D1 of the impeller 20 to the inlet diameter D0 of the impeller 20 is between 1.5-2.5, that is, D1=(1.5-2.5)*D0. For example, the ratio of D1 to D0 can be 1.5, 1.8, 2.2, 2.5, etc.

[0054] like Figure 3 and Figure 4As shown, in some embodiments, the radius of the volute tongue 11 is R0, and the ratio of the radius R0 of the volute tongue 11 to the base circle diameter D2 of the volute 10 is between 0.025 and 0.1, that is, R0 = (0.025-0.1)*D2. For example, the ratio of R0 to D2 can be 0.025, 0.05, 0.075, 0.1, and so on.

[0055] In this embodiment, by configuring R0 and D2 to be in an appropriate ratio, the radius R0 of the volute tongue 11 is of an appropriate size, which can further avoid flow separation when the airflow flows to the volute tongue 11, reduce aerodynamic noise, and improve the efficiency of the fan 100.

[0056] In other words, if the radius R0 of the volute tongue 11 is relatively small, the dynamic interference of the impeller 20 is relatively strong, which is easy to generate loud noise. If the radius R0 of the volute tongue 11 is relatively large, flow separation is easy to occur, affecting the energy efficiency of the fan 100. Therefore, in this embodiment, the radius R0 of the volute tongue 11 is limited to an appropriate range, which can further reduce the noise during the operation of the fan 100 and improve the efficiency of the fan 100.

[0057] See also Figure 5 and Figure 6 , Figure 5 is a schematic diagram of the cross-sectional structure of the impeller 20, Figure 6 It is a top view of the impeller 20 .

[0058] In some embodiments, the diameter of the wheel hub 21 is D3, the diameter of the wheel cover 22 is D4, and D4 is greater than D3. Optionally, D4=1-6 mm+D3.

[0059] like Figure 5 and Figure 6 As shown, in the present embodiment, the diameter D4 of the wheel cover 22 is greater than the diameter D3 of the wheel hub 21, and the difference between the two can be between 1-6 mm but is not limited thereto. Specifically, since the diameter D4 of the wheel cover 22 is greater than the diameter D3 of the wheel hub 21, the outer edge of the wheel cover 22 will protrude from the outer edge of the wheel hub 21 along the radial direction of the impeller 20. In this way, on the one hand, the airflow at the impeller outlet 202 can be better guided by the outer edge of the wheel cover 22, thereby reducing the energy loss of the airflow when it flows out of the impeller outlet 202, reducing the aerodynamic noise generated thereby, and improving the energy efficiency of the fan 100. On the other hand, the outer edge area of ​​the wheel cover 22 provides a larger area for convenient dynamic balancing. For example, a certain amount of mass can be removed from the outer edge area of ​​the wheel cover 22 to offset the imbalance, thereby quickly achieving the desired balance state. Compared with the method of achieving dynamic balancing by the Garni method in the prior art, dynamic balancing can be achieved by reducing weight in the embodiment of the utility model, which is convenient, fast and low in cost.

[0060] Please also read Figure 2 and Figure 5 In some embodiments, the height of the blade 23 gradually decreases from the impeller inlet 201 to the impeller outlet 202. Specifically, the height of the blade 23 is the height of the blade 23 in the axial direction of the impeller 20.

[0061] In this embodiment, the height of the blade 23 will gradually decrease along the direction from the impeller inlet 201 to the impeller outlet 202, so that in the process of the airflow flowing from the impeller inlet 201 through the impeller channel 203 to the impeller outlet 202, the flow area of ​​the airflow will gradually decrease, thereby further reducing the flow separation of the airflow in the impeller channel, ensuring that the airflow flows smoothly along the surface of the blade 23, further reducing the flow separation in the impeller channel 203 and the aerodynamic noise generated thereby, and improving the efficiency of the fan 100.

[0062] like Figure 2 and Figure 5 As shown, in some embodiments, the height of the blade 23 at the impeller inlet 201 is B1, the height of the blade 23 at the impeller outlet 202 is B2, and the ratio of B1 to B2 is between 1.2 and 2, that is, B1 = (1.2-2) * B2. For example, the ratio of B1 to B2 can be 1.2, 1.5, 1.8, 2, etc.

[0063] In this embodiment, by limiting the ratio of B1 and B2 within an appropriate range, it can be ensured that the impeller inlet 201 and the impeller outlet 202 both have an appropriate flow area, thereby reducing the flow separation in the impeller flow channel 203 and the aerodynamic noise generated thereby, and preventing the impeller outlet 202 from being too small to hinder the gas flow.

[0064] like Figure 3 As shown, in some embodiments, the inlet radius of the impeller 20 is R1, the outlet radius of the impeller 20 is R2, and the ratio of R2 to R1 is between 1.5 and 3, that is, R2 = (1.5-3) * R1. For example, the ratio of R2 to R1 is 1.5, 2, 2.5, 3, and so on.

[0065] The product of R1 and B1 is smaller than the product of R2 and B2, that is, R1*B1 is smaller than R2*B2. Specifically, R1*B1 represents the flow area of ​​the airflow at the impeller inlet 201, and R2*B2 represents the flow area of ​​the airflow at the impeller outlet 202.

[0066] In this embodiment, by setting the flow area at the impeller outlet 202 to be larger than the flow area at the impeller inlet 201, it can adapt to the increase in speed and pressure of the airflow in the impeller 20, thereby maintaining the stability of the airflow flow, improving the efficiency of the impeller 20, and reducing the noise in the airflow.

[0067] In some embodiments, the inlet angle of the blade 23 is β1, and the outlet angle of the blade 23 is β2, and β2 is greater than or equal to β1, that is, β2≥β1.

[0068] Specifically, the inlet angle β1 of the blade 23 refers to the angle between the leading edge 231 of the blade 23 and the edge line of the impeller inlet 201, and the outlet angle β2 of the blade 23 refers to the angle between the trailing edge 232 of the blade 23 and the edge line of the impeller outlet 202. Optionally, the inlet angle β1 of the blade 23 and the outlet angle β2 of the blade 23 can both be between 20 and 30 degrees, and the outlet angle β2 of the blade 23 is slightly larger than the inlet angle β1 of the blade 23.

[0069] See also Figure 7 , Figure 7 It is a schematic diagram of the three-dimensional structure of the impeller 20 from another viewing angle.

[0070] In some embodiments, a connecting ring 210 is provided on one side of the hub 21 away from the wheel cover 22, and the connecting ring 210 is used to fix the bar magnetic ring. Optionally, the connecting ring 210 and the hub 21 are an integrally formed structure to improve the structural strength and stability thereof.

[0071] The connecting ring 210 can be used to fix the bar magnetic ring of the motor. In this way, there is no need to add an additional magnetic ring fixing ring to fix the bar magnetic ring, which can reduce the number of parts and components and reduce the production cost.

[0072] Please refer to Figure 1 In some embodiments, the volute 10 includes an upper shell 12 and a lower shell 13, and the upper shell 12 and the lower shell 13 can be fixedly assembled by means of snap connection, threaded connection, etc.

[0073] In some embodiments, the fan 100 also includes an air inlet structure 30, which is provided with an air inlet 101, and an air outlet 102 is arranged on the volute 10. After the fan 100 is started, the air flow can enter the fan 100 through the air inlet 101 on the air inlet structure 30, and flow out from the air outlet 102 on the volute 10 under the conveying action of the impeller 20.

[0074] In some embodiments, the upper shell 12 is fixedly connected to the air inlet structure 30. For example, the upper shell 12 can be fixedly connected to the air inlet structure 30 by means of snap-fitting, ultrasonic welding, etc. In addition, the upper shell 12 can also be integrally formed with the air inlet structure 30, thereby reducing the number of parts and components and reducing production and assembly costs.

[0075] See also Figure 8 , Figure 8 Schematic diagram of the three-dimensional structure of the cleaning robot 200 in the embodiment of the utility model.

[0076] Based on the same utility model concept, the embodiment of the utility model further provides a cleaning robot 200, which includes a body and the cleaning robot 200 as in any of the above embodiments.

[0077] Since the cleaning robot 200 includes the fan 100 in any of the above embodiments, it also has the beneficial effects in any of the above embodiments. Please refer to the above for the specific beneficial effects, which will not be repeated here.

[0078] Optionally, a mounting hole 103 is provided on the fan 100 (see Figure 1 ), the fan 100 can be fixed to the body of the cleaning robot 200 through the mounting hole 103 and in conjunction with fasteners. Optionally, the fasteners can be screws, bolts, etc.

[0079] In summary, the embodiments of the utility model provide a fan 100 and a cleaning robot 200, by setting the thickness of the blade 23 to gradually increase and then gradually decrease, and the thickest part of the blade 23 is located in the chord length range of 0.65-0.8 of the blade 23, so that when the airflow flows from the leading edge 231 of the blade 23 to the trailing edge 232 of the blade 23, the flow area of ​​the airflow changes more evenly, the airflow can flow close to the surface of the blade 23, reducing the flow separation in the impeller flow channel 203 and the aerodynamic noise generated thereby, and improving the efficiency of the fan 100. By configuring the ratio of the base circle diameter D2 of the volute 10 to the outlet diameter D1 of the impeller in the range of 1.1-1.4, the noise caused by the dynamic and static interference in the flow channel of the volute 10 can be significantly reduced while ensuring the performance of the fan 100. By configuring the diameter of the hub 21 to be larger than the diameter of the wheel cover 22, the airflow at the impeller outlet 202 can be guided to reduce the airflow diffusion loss and the resulting aerodynamic noise, and it is also convenient to produce dynamic balance and speed up the production cycle.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fan, characterized in that: It includes a volute and an impeller arranged in the volute; The impeller includes a hub, a wheel cover, and a plurality of blades arranged between the hub and the wheel cover. Along the chord length direction of the blade and from the leading edge of the blade to the trailing edge of the blade, the thickness of the blade first gradually increases and then gradually decreases, wherein the chord length of the blade is the straight-line distance from the leading edge of the blade to the trailing edge of the blade.

2. The fan according to claim 1, characterized in that: The thickest part of the blade is located in the range of 0.65-0.8 of the chord length of the blade.

3. The fan according to claim 1, characterized in that: The volute includes a volute tongue, the outlet diameter of the impeller is D1, the base circle diameter of the volute is D2, and the ratio of D2 to D1 is between 1.1-1.4, wherein the base circle of the volute is tangent to the volute tongue.

4. The fan according to claim 3, characterized in that: The radius of the volute tongue is R0, and the ratio of R0 to D2 is between 0.025 and 0.

1.

5. The fan according to claim 1, characterized in that: The diameter of the wheel hub is D3, the diameter of the wheel cover is D4, and D4 is larger than D3.

6. The fan according to claim 1, characterized in that: The height of the blades gradually decreases along the direction from the impeller inlet to the impeller outlet; The height of the blade at the impeller inlet is B1, the height of the blade at the impeller outlet is B2, and the ratio of B1 to B2 is between 1.2 and 2.

7. The fan according to claim 6, characterized in that: The inlet radius of the impeller is R1, the outlet radius of the impeller is R2, the ratio of R2 to R1 is between 1.5 and 3, and the product of R1 and B1 is smaller than the product of R2 and B2.

8. The fan according to claim 1, characterized in that: The inlet angle of the blade is β1, the outlet angle of the blade is β2, and β2 is greater than or equal to β1.

9. The fan according to claim 1, characterized in that: A connecting ring is provided on the side of the wheel hub facing away from the wheel cover, and the connecting ring is used to fix the bar-shaped magnetic ring.

10. A cleaning robot, characterized in that: It comprises a machine body and a fan as claimed in any one of claims 1 to 9, wherein the fan is installed in the machine body.

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