Impeller and blower

Abstract

The embodiment of the utility model provides an impeller and a blower, and relates to the technical field of household appliances. The impeller comprises a hub and a plurality of blades arranged on the hub. Each blade comprises a suction curved surface and a pressure curved surface. The pressure curved surface and the suction curved surface intersect at the front edge of the blade to form a front edge line. The value range of the inlet angle of any point on the front edge line is-45 degrees to-7 degrees, and the value range of the outlet angle of any point on the front edge line is 15-30 degrees. By optimizing the value ranges of the inlet angle and the outlet angle of each point on the front edge line, the improved impeller not only inhibits a vortex structure on the surface of the blade, but also weakens the axial movement of airflow at the top of the blade, so that the axial power capability of the impeller on the airflow is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of household appliances, specifically, relates to a impeller and hair drier. BACKGROUND

[0002] The impeller is the most core moving part in the fan, plays the purpose of making gas work, makes gas obtain energy and thus reaches the purpose of compressing gas.

[0003] The leading edge and the leading edge line are two important concepts of the geometric characteristics of the impeller blade, the leading edge of the blade is the most forward edge of the windward surface or the flow surface, and it is the part that the fluid first contacts. The design of the leading edge of the blade directly affects the initial condition of fluid flow, and has an important influence on the aerodynamic performance and efficiency of the blade. The leading edge line is the geometric representation of the leading edge of the blade in a specific coordinate system. The shape and position of the leading edge line determine the geometric characteristics of the leading edge of the blade. The shape and position of the leading edge line are important parameters in blade design, which affect the aerodynamic performance, flow characteristics and structural strength of the blade. The inlet angle and outlet angle of each point on the leading edge line of the blade are key parameters of the flow characteristics of the fluid on the blade, which directly affect the aerodynamic performance and efficiency of the blade.

[0004] In the prior art, the inlet angle and outlet angle of each point on the leading edge line are not reasonably set, which affects the axial work of the impeller on the airflow. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of impellers and hair driers, optimize the value range of each point on blade leading edge line, can inhibit the vortex structure of blade surface, and the axial work ability of impeller on airflow is enhanced.

[0006] The embodiment of the utility model can be realized as follows:

[0007] Firstly, the utility model provides a kind of impeller, including hub and the multiple blades of setting in hub;

[0008] The blade includes suction surface and pressure surface;

[0009] The pressure surface and the suction surface meet to form leading edge line at the leading edge of the blade;

[0010] The value range of inlet angle at any point on the leading edge line is-45 ° to-7 °, and the value range of outlet angle is 15 ° to 30 °.

[0011] In optional implementation, in the height direction of the blade, the leading edge line has first control point, second control point, third control point, fourth control point, fifth control point and sixth control point sequentially spaced from low to high.

[0012] At the first control point, the inlet angle ranges from -45° to -40°, and the outlet angle ranges from 15° to 20°; at the second control point, the inlet angle ranges from -35° to -30°, and the outlet angle ranges from 18° to 23°; at the third control point, the inlet angle ranges from -34° to -32°, and the outlet angle ranges from 19° to 22°; at the fourth control point, the inlet angle ranges from -23° to -28°, and the outlet angle ranges from 21° to 24°; at the fifth control point, the inlet angle ranges from -17° to -13°, and the outlet angle ranges from 23° to 28°; at the sixth control point, the inlet angle ranges from -10° to -7°, and the outlet angle ranges from 25° to 30°.

[0013] In an optional embodiment, the first control point, the second control point, the third control point, the fourth control point, the fifth control point and the sixth control point are arranged at equal intervals.

[0014] In an optional embodiment, the blade further comprises an upper curved surface and a lower curved surface, the upper end of the pressure curved surface and the suction curved surface intersects with the upper curved surface, and the lower end of the pressure curved surface and the suction curved surface intersects with the lower curved surface.

[0015] The first control point is the intersection of the leading edge line and the lower curved surface, and the sixth control point is the intersection of the leading edge line and the upper curved surface.

[0016] The second control point, the third control point, the fourth control point and the fifth control point are arranged at equal intervals from bottom to top on the leading edge line.

[0017] In an optional embodiment, the inlet angle at the first control point is -43°, and the outlet angle is 17°; the inlet angle at the second control point is -34°, and the outlet angle is 18°; the inlet angle at the third control point is -33.1°, and the outlet angle is 19.2°; the inlet angle at the fourth control point is -25.5°, and the outlet angle is 21.7°; the inlet angle at the fifth control point is -16°, and the outlet angle is 23.5°; and the inlet angle at the sixth control point is -9.1°, and the outlet angle is 26°.

[0018] In an optional embodiment, the inlet angle at the first control point is -42°, and the outlet angle is 18°; the inlet angle at the second control point is -33.5°, and the outlet angle is 19.5°; the inlet angle at the third control point is -33°, and the outlet angle is 20.7°; the inlet angle at the fourth control point is -27°, and the outlet angle is 22.4°; the inlet angle at the fifth control point is -15.5°, and the outlet angle is 24.5°; the inlet angle at the sixth control point is -8°, and the outlet angle is 27.5°.

[0019] In an optional embodiment, the inlet angle at the first control point is -40°, and the outlet angle is 19.7°; the inlet angle at the second control point is -31.3°, and the outlet angle is 21.5°; the inlet angle at the third control point is -32.5°, and the outlet angle is 22°; the inlet angle at the fourth control point is -23°, and the outlet angle is 23.8°; the inlet angle at the fifth control point is -13°, and the outlet angle is 26°; the inlet angle at the sixth control point is -7°, and the outlet angle is 29°.

[0020] In an optional embodiment, the center line length of the blade at the first control point is 24.15 mm; the center line length of the blade at the second control point is 22.25 mm; the center line length of the blade at the third control point is 20.41 mm; the center line length of the blade at the fourth control point is 19.58 mm; the center line length of the blade at the fifth control point is 19.32 mm; and the center line length of the blade at the sixth control point is 19.1 mm.

[0021] In an optional embodiment, one side of the hub is provided with a conical surface, and nine blades are arranged on the conical surface at equal intervals, and the lower curved surface is coplanar with the conical surface.

[0022] and / or;

[0023] the upper curved surface extends downward from one end connected to the leading edge of the blade to the other end connected to the trailing edge of the blade;

[0024] and / or;

[0025] the blade is a three-dimensional twisted shape with a rear bend.

[0026] In a second aspect, the utility model provides a hair dryer, including motor, shell and preceding any one of the described impeller of embodiment;

[0027] the shell is provided with a cavity, an air inlet and an air outlet which communicate with the cavity;

[0028] The motor is installed in the cavity and fixed with the shell, and the hub is fixedly connected with an output shaft of the motor;

[0029] The motor operates to drive the impeller to rotate to suck external air into the cavity through the air inlet and send the air out through the air outlet.

[0030] The impeller and the hair dryer provided by the embodiment of the utility model have the beneficial effects that:

[0031] The application sets the value range of the inlet angle of each point on the leading edge line of the blade of the impeller to -45° to -7°, and sets the value range of the outlet angle to 15°-30°. Through flow field analysis, it can be obtained that the improved impeller not only suppresses the vortex structure on the surface of the blade, but also weakens the axial movement of the airflow at the top of the blade, thereby enhancing the axial work function of the impeller on the airflow. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained on the premise of not creating laboriously.

[0033] Figure 1 The structure schematic diagram of the hair dryer provided by the embodiment of the utility model is shown in the figure;

[0034] Figure 2 The partial sectional view schematic diagram of the hair dryer provided by the embodiment of the utility model is shown in the figure;

[0035] Figure 3 The explosion structure schematic diagram of the hair dryer provided by the embodiment of the utility model is shown in the figure;

[0036] Figure 4 The motor installation structure schematic diagram of the hair dryer provided by the embodiment of the utility model is shown in the figure;

[0037] Figure 5 The structure schematic diagram of the middle shell of the hair dryer provided by the embodiment of the utility model is shown in the figure;

[0038] Figure 6 The structure schematic diagram of the impeller provided by the embodiment of the utility model is shown in the figure;

[0039] Figure 7 The structure schematic diagram of another view of the impeller provided by the embodiment of the utility model is shown in the figure;

[0040] Figure 8The suction surface one side projection schematic view of the blade of the impeller is provided for the embodiment of the utility model;

[0041] Figure 9 The pressure surface one side shaft side schematic view of the blade of the impeller is provided for the embodiment of the utility model;

[0042] Figure 10 The shaft side schematic view of the blade of the impeller is provided for the embodiment of the utility model;

[0043] Figure 11 The fluid simulation schematic view before the value range of the inlet angle and the outlet angle of each point on the leading edge line is not optimized;

[0044] Figure 12 The fluid simulation schematic view after the value range of the inlet angle and the outlet angle of each point on the leading edge line is optimized;

[0045] Figure 13 The test characteristic curve comparison chart of the impeller of the traditional structure and the impeller provided by the application;

[0046] Figure 14 The test characteristic curve comparison chart of the inlet angle and the outlet angle in the value range and not in the value range.

[0047] Icon: 100 - impeller;110 - hub;111 - conical surface;130 - blade;131 - suction surface;133 - pressure surface;135 - leading edge line;137 - first control point;139 - second control point;141 - third control point;143 - fourth control point;145 - fifth control point;147 - sixth control point;149 - upper surface;151 - lower surface;300 - hair dryer;310 - motor;330 - shell;331 - cavity;333 - air inlet;335 - air outlet;337 - front shell;339 - middle shell;341 - rear shell;343 - outer shell;345 - motor base;347 - guide vane;350 - mica sheet seat;370 - mica sheet. DETAILED DESCRIPTION

[0048] In the prior art, the value setting of the inlet angle and the outlet angle of each point on the leading edge line of the blade of the impeller is unreasonable, which affects the axial work of the impeller on the airflow. The performance of the axial work of the impeller on the airflow directly affects the wind speed and the air volume of the hair dryer, and further affects the performance of the hair dryer.

[0049] In view of the above problems, the utility model provides an impeller and a hair dryer which can improve the axial work of the impeller on the airflow, so as to solve the problem that the above-mentioned weak axial work of the impeller affects the wind speed and the air volume of the hair dryer.

[0050] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0052] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0053] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0055] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0056] The overall structure, working principle and technical effects of the impeller and the blower provided by the present application will be described in detail below through embodiments and in conjunction with the drawings.

[0057] Please refer to Figures 1 to 5The embodiment provides a hair dryer 300, which comprises a motor 310, a shell 330 and an impeller 100. The shell 330 is provided with a cavity 331, an air inlet 333 and an air outlet 335 which are communicated with the cavity 331. The motor 310 is installed in the cavity 331 and fixed to the shell 330. The impeller 100 is fixedly connected to an output shaft of the motor 310. The motor 310 drives the impeller 100 to rotate to suck external air into the cavity 331 through the air inlet 333 and send the air out through the air outlet 335.

[0058] Specifically, the shell 330 comprises a front shell 337, a middle shell 339 and a rear shell 341. The front shell 337 and the rear shell 341 are installed at two ends of the middle shell 339. The air inlet 333 is arranged on the rear shell 341 and has a flow collecting effect. The motor 310 is installed in the middle shell 339, and the air outlet 335 is arranged on an end surface of the front shell 337. The motor 310 drives the impeller 100 to rotate, and the impeller 100 can suck external air into the middle shell 339 through the air inlet 333 and send the air out through the air outlet 335 after compression and acceleration.

[0059] Please refer to Figures 1 to 5 Specifically, the middle shell 339 comprises an outer shell 343, a motor seat 345 and a plurality of guide vanes 347. The outer shell 343 is in a hollow cylindrical shape. The motor seat 345 is arranged in the outer shell 343, and a plurality of guide vanes 347 are arranged on an outer periphery of the motor seat 345 at equal intervals in a circumferential direction, and the guide vanes 347 are connected to an inner wall of the outer shell 343.

[0060] The cross section of the guide vane 347 is a spline curve. The guide vane 347 is curved in a direction in which the impeller 100 rotates towards the front shell 337 from the rear shell 341. That is, one end of the guide vane 347 close to the impeller 100 is curved clockwise.

[0061] Please refer to Figures 1 to 5 Specifically, the inlet angle of the front edge of the guide vane 347 is in a range of 28°-32°, and the inlet angle of the tail edge is 0°. That is, the tail of the guide vane 347 is perpendicular to the axial direction of the impeller 100.

[0062] Since the air flow is accelerated after passing through the impeller 100, there is not only an axial velocity, but also a large circumferential velocity. The air flow in the middle shell 339 of the traditional structure will have a significant impact loss when entering, thereby having a greater negative impact on the performance of the blower 300. In the present embodiment, the flow guide vane 347 is arranged in the gap between the motor base 345 and the shell 343, which can effectively reduce the flow loss of the gas passing through the motor base 345 and the shell 343, and inhibit the development of the flow separation vortex formed on the inner side of the motor base 345 and the shell 343 channel, thereby improving the working efficiency of the blower 300. Secondly, the flow guide vane 347 can also be used as a mechanical connecting component between the motor base 345 and the shell 343, thereby improving the structural stability.

[0063] Please refer to Figures 1 to 5 Secondly, in the present embodiment, the blower 300 further comprises a mica sheet seat 350, an electric heating wire (not shown in the figure) and a plurality of mica sheets 370. The mica sheet seat 350 is installed at the rear end of the motor base 345 and abuts against the rear shell 341. The plurality of mica sheets 370 are installed in the mica sheet seat 350 along the circumferential direction of the mica sheet seat 350 for heat insulation. The electric heating wire is wound around the outer periphery of the mica sheet 370. The electric heating wire can heat the passing air flow.

[0064] Please refer to Figures 6 to 10 In the present embodiment, the impeller 100 comprises a hub 110 and a plurality of blades 130 arranged on the hub 110. The blade 130 comprises a suction surface 131 and a pressure surface 133. The pressure surface 133 and the suction surface 131 intersect at the leading edge of the blade 130 to form a leading edge line 135. The value range of the inlet angle at any point on the leading edge line 135 is from -45° to -7°, and the value range of the outlet angle is from 15° to 30°.

[0065] In the present embodiment, the value range of the inlet angle at any point on the leading edge line 135 of the blade 130 of the impeller 100 is set to be from -45° to -7°, and the value range of the outlet angle is set to be from 15° to 30°. Through flow field analysis, it can be obtained that the improved impeller 100 not only inhibits the vortex structure on the surface of the blade 130, but also weakens the axial movement of the air flow at the top of the blade 130, thereby enhancing the axial working capacity of the impeller 100 on the air flow.

[0066] It is important to note that the inlet and outlet angles of each point on the leading edge line 135 are important parameters in describing the geometric and fluid flow characteristics of the blade 130. These angles directly affect the aerodynamic performance and efficiency of the blade 130. The inlet angle refers to the angle of the fluid as it enters the leading edge of the blade 130, relative to the tangent direction of the leading edge line 135. The inlet angle can be measured by the angle between the fluid velocity vector and the tangent direction of the leading edge line 135. Optimizing the inlet angle helps to smooth the incoming airflow, reducing turbulence and drag. The outlet angle refers to the angle of the fluid as it exits the trailing edge of the blade 130, relative to the tangent direction of the trailing edge line. The outlet angle can be measured by the angle between the fluid velocity vector and the tangent direction of the trailing edge line.

[0067] Please refer to Figure 11 and Figure 12 , Figure 11 Figure 1 is a fluid simulation diagram of the inlet and outlet angles of each point on the leading edge line 135 of the blade 130 before optimization of the value range. Figure 12 Figure 2 is a fluid simulation diagram of the inlet and outlet angles of each point on the leading edge line 135 of the blade 130 after optimization of the value range. After Figure 1 and Figure 2 comparison of the fluid simulation diagrams, it is clear that the optimized blade 130 has fewer vortices on its surface, and the axial movement of the airflow at the top of the blade 130 is also weakened, thereby enhancing the axial work capacity of the impeller 100 on the airflow.

[0068] It is also important to note that the suction surface 131 of the blade 130 refers to the side of the blade 130 where the pressure is lower. Typically, this side is located on the concave surface of the blade 130, which is the upstream side in the direction of fluid flow. Opposite the suction surface 131 is the pressure surface 133, which is the side of the blade 130 where the pressure is higher, typically located on the convex surface of the blade 130, which is the downstream side in the direction of fluid flow. Between the pressure surface 133 and the suction surface 131 is a transition zone, known as the leading edge and trailing edge of the blade 130. The leading edge is the part that the fluid first contacts, and the trailing edge is the part that the fluid finally leaves.

[0069] Please refer to Figures 6 to 10Specifically, in the height direction of the blade 130, the leading edge line 135 has the first control point 137, the second control point 139, the third control point 141, the fourth control point 143, the fifth control point 145 and the sixth control point 147 arranged in sequence from low to high. At the first control point 137, the inlet angle ranges from -45° to -40°, and the outlet angle ranges from 15° to 20°. At the second control point 139, the inlet angle ranges from -35° to -30°, and the outlet angle ranges from 18° to 23°. At the third control point 141, the inlet angle ranges from -34° to -32°, and the outlet angle ranges from 19° to 22°. At the fourth control point 143, the inlet angle ranges from -23° to -28°, and the outlet angle ranges from 21° to 24°. At the fifth control point 145, the inlet angle ranges from -17° to -13°, and the outlet angle ranges from 23° to 28°. At the sixth control point 147, the inlet angle ranges from -10° to -7°, and the outlet angle ranges from 25° to 30°.

[0070] The embodiment can improve the problem of vortex and improve the axial work function of the impeller 100 on the air flow by optimizing the value range of the inlet angle and the outlet angle at different control points.

[0071] In the embodiment, the first control point 137, the second control point 139, the third control point 141, the fourth control point 143, the fifth control point 145 and the sixth control point 147 are arranged at intervals.

[0072] The embodiment arranges the control points at intervals, so that the problem of vortex can be improved, the axial work function of the impeller 100 on the air flow can be improved, the air volume and the air pressure can be improved.

[0073] Please refer to Figures 6 to 10 In detail, the blade 130 further has an upper curved surface 149 and a lower curved surface 151, the upper end of the pressure curved surface 133 and the suction curved surface 131 intersects with the upper curved surface 149, and the lower end of the pressure curved surface 133 and the suction curved surface 131 intersects with the lower curved surface 151. The first control point 137 is the intersection of the leading edge line 135 and the lower curved surface 151, and the sixth control point 147 is the intersection of the leading edge line 135 and the upper curved surface 149. The second control point 139, the third control point 141, the fourth control point 143 and the fifth control point 145 are arranged at intervals from low to high on the leading edge line 135.

[0074] It can be understood that the first control point 137 and the sixth control point 147 are two end points of the leading edge line 135. The second control point 139, the third control point 141, the fourth control point 143 and the fifth control point 145 divide the leading edge line 135 into five equal lengths.

[0075] It should be noted that the leading edge line 135 is curved in three-dimensional space. The leading edge line 135 can be obtained by connecting the first control point 137, the second control point 139, the third control point 141, the fourth control point 143, and the fifth control point 145 in sequence. The upper curve 149 corresponds to the tip of the blade 130, and the lower curve 151 corresponds to the root of the blade 130.

[0076] Please refer to Figures 6 to 10 In a side view, it can be seen that the leading edge line 135 extends in the direction of the height of the blade 130 from low to high to the reverse bending of the trailing edge. It can be seen that the lower part is slightly concave, and the upper part is convex. The bottom of the leading edge line 135 is directly connected with the hub 110.

[0077] In some other embodiments of the present application, the first control point 137, the second control point 139, the third control point 141, the fourth control point 143, the fifth control point 145, and the sixth control point 147 are the intersection points of the cross sections at 0%, 20%, 40%, 60%, 80%, and 100% in the height direction of the blade 130 and the leading edge line 135, respectively.

[0078] Alternatively, the inlet angle at the first control point 137 is -43°, and the outlet angle is 17°. The inlet angle at the second control point 139 is -34°, and the outlet angle is 18°. The inlet angle at the third control point 141 is -33.1°, and the outlet angle is 19.2°. The inlet angle at the fourth control point 143 is -25.5°, and the outlet angle is 21.7°. The inlet angle at the fifth control point 145 is -16°, and the outlet angle is 23.5°. The inlet angle at the sixth control point 147 is -9.1°, and the outlet angle is 26°.

[0079] In this embodiment, the angles of the control points are optimized at equal intervals in the height direction of the blade 130, so that the problem of vortex can be further improved, the axial working capacity of the impeller 100 on the airflow is improved, and the air volume and air pressure are further improved.

[0080] Alternatively, the inlet angle at the first control point 137 is -42°, and the outlet angle is 18°. The inlet angle at the second control point 139 is -33.5°, and the outlet angle is 19.5°. The inlet angle at the third control point 141 is -33°, and the outlet angle is 20.7°. The inlet angle at the fourth control point 143 is -27°, and the outlet angle is 22.4°. The inlet angle at the fifth control point 145 is -15.5°, and the outlet angle is 24.5°. The inlet angle at the sixth control point 147 is -8°, and the outlet angle is 27.5°.

[0081] The embodiment further improves the vortex problem by optimizing the control angles of the blades 130 at the height direction, so as to improve the axial working capacity of the impeller 100 on the air flow, and further improve the air volume and air pressure.

[0082] Optionally, the inlet angle at the first control point 137 is -40°, and the outlet angle is 19.7°. The inlet angle at the second control point 139 is -31.3°, and the outlet angle is 21.5°. The inlet angle at the third control point 141 is -32.5°, and the outlet angle is 22°. The inlet angle at the fourth control point 143 is -23°, and the outlet angle is 23.8°. The inlet angle at the fifth control point 145 is -13°, and the outlet angle is 26°. The inlet angle at the sixth control point 147 is -7°, and the outlet angle is 29°.

[0083] The embodiment further improves the vortex problem by optimizing the control angles of the blades 130 at the height direction, so as to improve the axial working capacity of the impeller 100 on the air flow, and further improve the air volume and air pressure.

[0084] In the embodiment, the center line length of the blade 130 at the first control point 137 is 24.15 mm. The center line length of the blade 130 at the second control point 139 is 22.25 mm. The center line length of the blade 130 at the third control point 141 is 20.41 mm. The center line length of the blade 130 at the fourth control point 143 is 19.58 mm. The center line length of the blade 130 at the fifth control point 145 is 19.32 mm. The center line length of the blade 130 at the sixth control point 147 is 19.1 mm.

[0085] The embodiment further improves the vortex problem by optimizing the control angles of the blades 130 at the height direction, so as to improve the axial working capacity of the impeller 100 on the air flow, and further improve the air volume and air pressure.

[0086] Please refer to Figures 6 to 10 In the embodiment, the hub 110 is provided with a conical surface 111 on one side, and the nine blades 130 are arranged on the conical surface 111 at equal intervals, and the lower curved surface 151 is coplanar with the conical surface 111.

[0087] The embodiment sets the one side of the hub 110 as the conical surface 111, so as to reduce the turbulence and resistance of the air flow. The nine blades 130 can provide greater air pressure.

[0088] It can be understood that the lower curved surface 151 is coplanar with the conical surface 111, and it can be understood that the lower curved surface 151 of the blade 130 is cut by the conical surface 111 of the hub 110, thereby forming the lower curved surface 151 of the blade 130.

[0089] Further, the upper curved surface 149 extends downwardly and curvedly from a section connected with the leading edge of the blade 130 to an end connected with the trailing edge of the blade 130. The downwardly and curvedly extending upper curved surface 149 of the blade 130 can improve fluid flow efficiency, reduce flow separation, optimize pressure distribution, improve lift and thrust of the blade 130, reduce vibration and noise, and improve structural strength.

[0090] In one view of the impeller 100, the upper curved surface 149 is a three-dimensional curved surface in a spiral shape, and the curvature gradually decreases in the direction of the trailing edge. That is, the portion of the upper curved surface 149 close to the leading edge is more curved, and the portion close to the trailing edge is more smooth. Further, the portion of the upper curved surface 149 close to the leading edge has a slight inclination toward one side of the pressure curved surface 133, and the inclination angle in this direction gradually decreases in the direction of the trailing edge.

[0091] Further, the blade 130 is in a three-dimensional twisted shape with a backward bend. The blade 130 in the three-dimensional twisted shape with a backward bend in the embodiment can improve efficiency, improve flow rate, improve flow stability, and reduce noise.

[0092] In the embodiment, the trailing edge of the blade 130 is concave to form a curved surface, which can reduce noise.

[0093] Please refer to Figure 13 , Figure 13 The test characteristic curve comparison diagram of the traditional impeller 100 and the improved impeller 100 of the embodiment of the utility model is shown in FIG. 4. In FIG. 4, Figure 5 the horizontal axis of FIG. 4 is the rotating speed of the impeller 100, the right vertical axis is the air volume of the blower 300, and the left vertical axis is the noise of the blower 300.

[0094] As shown in FIG. 4, Figure 13 it can be obviously seen that the air volume and air pressure of the blower 300 of the embodiment are obviously greater than those of the blower 300 with the traditional impeller 100 at the same rotating speed. Although the air pressure and air volume of the blower 300 of the embodiment are greatly improved compared with those of the blower 300 with the traditional impeller 100, the noise of the blower 300 of the embodiment is not greatly increased compared with that of the traditional blower 300. In particular, as the rotating speed increases, the difference between the two in terms of noise gradually decreases and even becomes the same, which shows that the impeller 100 of the embodiment has a noise reduction effect.

[0095] It should be noted that the air pressure and air volume of the hair dryer 300 are important indicators of its performance, and noise is one of the key factors affecting user experience. Increasing air pressure and air volume often leads to an increase in noise, because increasing air pressure and air volume usually requires higher speed and stronger airflow. The hair dryer 300 provided in the embodiment and the conventional hair dryer 300 have the same noise when the speed of the impeller 100 is 20000 rpm, the air volume is better than 5 or so, and the air pressure is better than 4 or so. It can be seen that the comprehensive performance of the hair dryer 300 provided in the embodiment is stronger.

[0096] Please refer to Figure 14 , Figure 14 The inlet angle and outlet angle of each control point of the blade 130 of the impeller 100 of the hair dryer 300 are not within the parameter range of the present application, and the test characteristic curve of the hair dryer 300 provided in the embodiment is compared. Among them, Figure 6 The horizontal axis in the figure is the speed of the impeller 100, the right vertical axis is the air volume of the hair dryer 300, and the left vertical axis is the noise and air pressure. It can be seen from Figure 6 that the air volume and air pressure of the hair dryer 300 provided in the embodiment are better than those of the hair dryer 300 with a structure not within the parameter range at any speed, and the noise of the hair dryer 300 provided in the embodiment is also smaller at the same speed.

[0097] It should be noted that the structure not within the parameter range means that the inlet angle of any point on the leading edge line 135 of the blade 130 of the impeller 100 is not within the range of -45° to -7°, and the outlet angle is not within the range of 15° to 30°. The other structures of the blade 130 are basically the same.

[0098] It can be understood that the impeller 100 provided in the embodiment can also be applied to other household appliances or devices in other fields to blow air. The present application does not limit the impeller 100 to be applied only to the hair dryer 300.

[0099] In summary, the impeller 100 and the hair dryer 300 provided in the embodiment have the following beneficial effects:

[0100] In the embodiment, the inlet angle of any point on the leading edge line 135 of the blade 130 of the impeller 100 is set to -45° to -7°, and the outlet angle is set to 15° to 30°. Through flow field analysis, it can be found that the improved impeller 100 not only suppresses the vortex structure on the surface of the blade 130, but also weakens the axial movement of the airflow at the top of the blade 130, thereby enhancing the axial work function of the impeller 100 on the airflow.

[0101] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An impeller, characterized by, The hub (110) and a plurality of blades (130) arranged on the hub (110); The blade (130) comprises a suction surface (131) and a pressure surface (133); The pressure surface (133) and the suction surface (131) intersect at the leading edge of the blade (130) to form a leading edge line (135); The inlet angle at any point on the leading edge line (135) ranges from -45° to -7°, and the outlet angle ranges from 15° to 30°.

2. The impeller of claim 1, wherein In the height direction of the blade (130), the leading edge line (135) has a first control point (137), a second control point (139), a third control point (141), a fourth control point (143), a fifth control point (145) and a sixth control point (147) arranged in sequence from low to high; At the first control point (137), the inlet angle ranges from -45° to -40°, and the outlet angle ranges from 15° to 20°; at the second control point (139), the inlet angle ranges from -35° to -30°, and the outlet angle ranges from 18° to 23°; at the third control point (141), the inlet angle ranges from -34° to -32°, and the outlet angle ranges from 19° to 22°; at the fourth control point (143), the inlet angle ranges from -23° to -28°, and the outlet angle ranges from 21° to 24°; at the fifth control point (145), the inlet angle ranges from -17° to -13°, and the outlet angle ranges from 23° to 28°; at the sixth control point (147), the inlet angle ranges from -10° to -7°, and the outlet angle ranges from 25° to 30°.

3. The impeller of claim 2, wherein The first control point (137), the second control point (139), the third control point (141), the fourth control point (143), the fifth control point (145) and the sixth control point (147) are arranged at equal intervals.

4. The impeller of claim 3, wherein The blade (130) further comprises an upper surface (149) and a lower surface (151), the upper ends of the pressure surface (133) and the suction surface (131) intersect the upper surface (149), and the lower ends of the pressure surface (133) and the suction surface (131) intersect the lower surface (151); The first control point (137) is the intersection of the leading edge line (135) and the lower surface (151), and the sixth control point (147) is the intersection of the leading edge line (135) and the upper surface (149); The second control point (139), the third control point (141), the fourth control point (143) and the fifth control point (145) are arranged at equal intervals from bottom to top on the leading edge line (135).

5. The impeller of any one of claims 2-4, wherein, The inlet angle at the first control point (137) is -43°, and the outlet angle is 17°; the inlet angle at the second control point (139) is -34°, and the outlet angle is 18°; the inlet angle at the third control point (141) is -33.1°, and the outlet angle is 19.2°; the inlet angle at the fourth control point (143) is -25.5°, and the outlet angle is 21.7°; the inlet angle at the fifth control point (145) is -16°, and the outlet angle is 23.5°; the inlet angle at the sixth control point (147) is -9.1°, and the outlet angle is 26°.

6. The impeller of any one of claims 2-4, wherein, The inlet angle at the first control point (137) is -42°, and the outlet angle is 18°; the inlet angle at the second control point (139) is -33.5°, and the outlet angle is 19.5°; the inlet angle at the third control point (141) is -33°, and the outlet angle is 20.7°; the inlet angle at the fourth control point (143) is -27°, and the outlet angle is 22.4°; the inlet angle at the fifth control point (145) is -15.5°, and the outlet angle is 24.5°; the inlet angle at the sixth control point (147) is -8°, and the outlet angle is 27.5°.

7. The impeller of any one of claims 2-4, wherein, The inlet angle at the first control point (137) is -40°, and the outlet angle is 19.7°; the inlet angle at the second control point (139) is -31.3°, and the outlet angle is 21.5°; the inlet angle at the third control point (141) is -32.5°, and the outlet angle is 22°; the inlet angle at the fourth control point (143) is -23°, and the outlet angle is 23.8°; the inlet angle at the fifth control point (145) is -13°, and the outlet angle is 26°; the inlet angle at the sixth control point (147) is -7°, and the outlet angle is 29°.

8. The impeller of any one of claims 2-4, wherein, At the first control point (137), the center line length of the blade (130) is 24.15 mm; at the second control point (139), the center line length of the blade (130) is 22.25 mm; at the third control point (141), the center line length of the blade (130) is 20.41 mm; at the fourth control point (143), the center line length of the blade (130) is 19.58 mm; at the fifth control point (145), the center line length of the blade (130) is 19.32 mm; at the sixth control point (147), the center line length of the blade (130) is 19.1 mm.

9. The impeller of claim 4, wherein One side of the hub (110) is provided with a conical surface (111), and the nine blades (130) are arranged equidistantly on the conical surface (111), and the lower curved surface (151) is coplanar with the conical surface (111); and / or; The upper curved surface (149) extends downwardly from one end connected with the leading edge of the blade (130) to the other end connected with the trailing edge of the blade (130); and / or; The blade (130) is a three-dimensional twisted shape with a rearward bend.

10. A hair dryer characterized by The impeller as claimed in any one of claims 1-9, comprising a motor (310), a housing (330), and the impeller; The housing (330) is provided with a cavity (331), an air inlet (333) and an air outlet (335) in communication with the cavity (331); The motor (310) is installed in the cavity (331) and fixed to the housing (330), and the hub (110) is fixedly connected with the output shaft of the motor (310); The motor (310) is operated to drive the impeller to rotate so as to suck external air into the cavity (331) from the air inlet (333) and send the air out from the air outlet (335).

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