CN114483619B - Mixed flow impeller, mixed flow fan, air purifier and household appliance - Google Patents

Abstract

The present invention provides a mixed flow impeller, a mixed flow fan, an air purifier and a household appliance. The mixed flow impeller includes a wheel disc, a wheel cover and a plurality of blades. The axis of the wheel cover passes through an air inlet. The plurality of blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and are arranged circumferentially at the air inlet. An air outlet is formed between the outer periphery of the wheel disc and the wheel cover away from the air inlet. The inner surface of the wheel cover is formed by a plurality of meridian profile lines rotating around the axis of the air inlet. The profile line of the inner surface of the wheel disc in the axial section of the air inlet is arranged in an arc shape, the meridian profile line is arranged in a parabola, and the meridian profile line is concavely curved toward the wheel disc. The mixed flow impeller of the present invention optimizes the meridian profile line of the wheel cover and the profile line of the wheel disc so that the inner surface of the wheel disc and the inner surface of the wheel cover have better aerodynamic performance, obtain greater airflow pressure and flow, reduce the generation of vortex, improve the flow efficiency of the airflow, and reduce the impact noise generated by the outlet airflow of the mixed flow impeller.

Description

Mixed flow impellers, mixed flow fans, air purifiers and household appliances

Technical Field

The present invention relates to the technical field of mixed flow fans, and in particular to a mixed flow impeller, a mixed flow fan having the mixed flow impeller, an air purifier having the mixed flow fan, and a household appliance having the mixed flow fan.

Background Art

A mixed flow fan is a fan between an axial flow fan and a centrifugal fan. The impeller of a mixed flow fan allows the air to move both centrifugally and axially, so that the movement of the air inside the shell of the mixed flow fan is a mixture of axial and centrifugal movement. Therefore, the mixed flow fan has the advantages of a higher pressure coefficient than an axial flow fan and a larger flow coefficient than a centrifugal fan.

The impeller of the mixed flow fan is mainly composed of a wheel disc, a wheel cover, and multiple blades. The multiple blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and are evenly arranged in the circumferential direction of the impeller. The inner surface of the wheel disc is formed by multiple first meridian profiles rotating around the axis of the impeller, and the inner surface of the wheel cover is formed by multiple second meridian profiles rotating around the axis of the impeller. The air flow channel in the impeller is formed by the inner surface of the wheel disc, the inner surface of the wheel cover, and the outer surface of the blades. The flow field in the air flow channel plays a decisive role in the performance of the entire machine equipment. In addition to being affected by the outer profile of the blades, the flow field in the air flow channel is also obviously related to the first meridian profile of the wheel disc and the second meridian profile of the wheel cover. Since the air inlet of the impeller is set on the wheel cover, the wheel cover not only has a flow guiding function, but also a flow collecting function, so the second meridian profile of the wheel cover has a particularly obvious effect on the flow field in the air flow channel. Due to the inadequate optimization design of the second meridian profile of the existing wheel cover, the flow field performance in the airflow channel is reduced, which in turn leads to increased noise and reduced energy efficiency of the impeller.

Summary of the invention

In order to achieve the first purpose of the present invention, the present invention provides a high-efficiency and low-noise mixed flow impeller, which can enable the airflow to obtain a higher pressure and flow rate, while reducing the generation of vortices, improving the flow efficiency of the airflow in the mixed flow impeller, and reducing the impact noise generated by the outlet airflow of the mixed flow impeller.

In order to achieve the second objective of the present invention, the present invention provides a mixed flow fan having the mixed flow impeller.

In order to achieve the third objective of the present invention, the present invention provides an air purifier having the above-mentioned mixed flow fan.

In order to achieve the fourth object of the present invention, the present invention provides a household appliance having the above-mentioned mixed flow fan.

In order to achieve the first purpose of the present invention, the present invention provides a mixed flow impeller, including a wheel disc, a wheel cover and a plurality of blades, the axis of the wheel cover passes through an air inlet, the plurality of blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and are arranged in the circumferential direction of the air inlet, an air outlet is formed between the outer periphery of the wheel disc and the wheel cover away from the air inlet, the inner surface of the wheel cover is formed by a plurality of meridian profile lines rotating around the axis of the air inlet, the profile lines of the inner surface of the wheel disc in the axial section of the air inlet are arranged in an arc shape, the meridian profile lines are arranged in a parabola, and the meridian profile lines are concavely curved toward the wheel disc.

It can be seen from the above scheme that the mixed flow impeller of the mixed flow fan of the present invention performs parabolic optimization design on the meridian surface profile of the inner surface of the wheel cover formed by rotating around the axis of the air inlet, and performs arc line optimization design on the profile of the inner surface of the wheel disc in the axial section of the air inlet, so that the inner surface of the wheel disc and the inner surface of the wheel cover have good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction of the mixed flow impeller and the air inlet direction of the mixed flow impeller. While ensuring the air volume, the mixed flow impeller of the present invention can enable the airflow to obtain a larger pressure and flow rate, effectively suppress the boundary separation phenomenon of the airflow in the mixed flow impeller due to pressure expansion, and at the same time reduce or even eliminate the generation of vortices, thereby improving the flow efficiency of the airflow in the mixed flow impeller and reducing the impact noise generated by the airflow at the air outlet of the mixed flow impeller.

A further solution is that the end of the blade close to the air inlet is the leading edge, and the width of the air outlet is greater than the width between the inner surface of the wheel disc and the inner surface of the wheel cover close to the leading edge.

A further solution is that any point on the meridian line lies in the equation On the parabola formed, α＝a×β, θ＝(1-a)×β, 0.25≤a≤0.75, 50°≤β≤90°, The first end point of the meridian profile line at the air inlet and the second end point of the meridian profile line at the air outlet are connected to form an X-axis line, the Y-axis line is arranged perpendicular to the X-axis line, α is the angle between the first tangent line of the first end point and the X-axis line, θ is the angle between the second tangent line of the second end point and the X-axis line, β is the angle between the first tangent line and the second tangent line, L is the distance between the first end point and the second end point, is the outer diameter of the wheel cover.

A further solution is that L is 34.3 mm; and/or β is 70°; and/or a is 0.45.

A further solution is that the curvature direction of the arc line is the same as the curvature direction of the meridian profile line.

A further solution is that the outer peripheral diameter of the wheel cover is larger than the outer peripheral diameter of the wheel disc; or, the outer peripheral diameter of the wheel cover is smaller than the outer peripheral diameter of the wheel disc.

A further solution is that the blades are three-dimensional twisted blades.

A further solution is that one end of the blade close to the air inlet is the leading edge, the other end of the blade close to the air outlet is the trailing edge, and the connection position between the leading edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is a rounded corner; and/or, the angle between the leading edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is between 70° and 110°; and/or, the angle between the leading edge and the upper edge of the inner surface of the blade adjacent to the wheel disk is between 70° and 110°; and/or, the angle between the trailing edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is between 70° and 110°; and/or, the angle between the trailing edge and the upper edge of the inner surface of the blade adjacent to the wheel disk is between 70° and 110°.

A further solution is that the wheel disc is provided with a mounting hole, the mounting hole is coaxially arranged with the air inlet, and a steel ring is arranged in the mounting hole.

A further solution is that the steel ring and the wheel disc are an integrally formed structure; and/or the wheel disc and the blades are an integrally formed structure.

A further solution is that a positioning block is protruded from the lower edge of the inner surface of the blade adjacent to the wheel cover, a positioning hole is formed through the wheel cover, the positioning block passes through the positioning hole and is welded to connect the lower edge to the wheel cover.

A further solution is that the number of positioning blocks and positioning holes is at least two respectively, a plurality of positioning blocks are arranged side by side in the extension direction of the lower edge, and one positioning block passes through one positioning hole and is welded to connect the lower edge to the wheel cover.

In order to achieve the second objective of the present invention, the present invention provides a mixed flow fan, including a mixed flow impeller, and the mixed flow impeller is the mixed flow impeller mentioned above.

In order to achieve the third objective of the present invention, the present invention provides an air purifier, including a mixed flow fan, which is the mixed flow fan mentioned above.

In order to achieve the fourth objective of the present invention, the present invention provides a household appliance, comprising a mixed flow fan, which is the mixed flow fan mentioned above.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of an embodiment of a mixed flow fan of the present invention.

FIG. 2 is a structural diagram of a mixed flow impeller in an embodiment of a mixed flow fan of the present invention.

FIG. 3 is a top view of the mixed flow impeller in the mixed flow fan embodiment of the present invention.

FIG. 4 is a cross-sectional view of a mixed flow impeller in an embodiment of a mixed flow fan of the present invention.

FIG. 5 is a schematic diagram of the meridian profile of the mixed flow impeller in the mixed flow fan embodiment of the present invention.

FIG. 6 is a partial structural diagram of a mixed flow impeller in an embodiment of a mixed flow fan of the present invention.

FIG. 7 is a partial cross-sectional view of a mixed flow fan embodiment of the present invention applied in an air purifier.

FIG8 is a comparison diagram of noise curves of a mixed flow fan embodiment of the present invention and a conventional mixed flow fan at the same air volume.

FIG. 9 is a flow field distribution diagram of a conventional mixed flow fan in the Y-Z section.

FIG. 10 is a flow field distribution diagram of the mixed flow fan embodiment of the present invention at the YZ section.

FIG. 11 is a flow field distribution diagram of a conventional mixed flow fan in an XY section.

FIG. 12 is a flow field distribution diagram of the mixed flow fan embodiment of the present invention in the XY section.

FIG. 13 is a diagram showing pressure distribution on the suction surface of a blade of a conventional mixed flow fan.

FIG. 14 is a diagram showing the pressure distribution on the suction surface of the blades in the mixed flow fan embodiment of the present invention.

FIG. 15 is a diagram showing pressure distribution on the pressure surface of a blade of a conventional mixed flow fan.

FIG. 16 is a diagram showing the pressure distribution on the pressure surface of the blades in the mixed flow fan embodiment of the present invention.

FIG. 17 is a relative velocity vector diagram of the suction surface of a blade of a conventional mixed flow fan.

FIG. 18 is a relative velocity vector diagram of the suction surface of the blades in the mixed flow fan embodiment of the present invention.

FIG. 19 is a relative velocity vector diagram of the pressure surface of the blades of a conventional mixed flow fan.

FIG. 20 is a relative velocity vector diagram of the pressure surface of the blades in the mixed flow fan embodiment of the present invention.

21 is a schematic diagram of six cross-sectional positions for simulating the flow distribution on the rotating surface of the mixed flow impeller in the mixed flow fan embodiment of the present invention.

FIG. 22 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the first section in the mixed flow fan embodiment of the present invention.

23 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the second section in the mixed flow fan embodiment of the present invention.

24 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the third section in the mixed flow fan embodiment of the present invention.

25 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the fourth section in the mixed flow fan embodiment of the present invention.

FIG. 26 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the fifth section in the mixed flow fan embodiment of the present invention.

27 is a flow distribution diagram of the rotating surface of the mixed flow impeller at the sixth section in the mixed flow fan embodiment of the present invention.

The present invention is further described below in conjunction with the accompanying drawings and embodiments.

DETAILED DESCRIPTION

Referring to FIGS. 1 to 6 , this embodiment discloses a mixed flow fan 1, including a motor 11 and a mixed flow impeller 12, wherein the mixed flow impeller 12 includes a wheel disc 121, a wheel cover 122, and a plurality of blades 123, wherein the axis of the wheel cover 122 is penetrated by an air inlet 1221, wherein the plurality of blades 123 are connected between the inner surface 1211 of the wheel disc 121 and the inner surface 1222 of the wheel cover 122 and are evenly arranged in the circumferential direction of the air inlet 1221, wherein an air outlet 125 is formed between the outer periphery of the wheel disc 121 and the wheel cover 122 away from the air inlet 1221, and the inner surface 1222 of the wheel cover 122 is formed by a plurality of meridian profile lines 1223 rotating around the axis of the air inlet 1221. Any point of the meridian profile line 1223 of this embodiment is located at the equation On the parabola formed, α＝a×β, θ＝(1-a)×β, 0.25≤a≤0.75, 50°≤β≤90°, The first endpoint 1224 of the meridian line 1223 located at the air inlet 1221 and the second endpoint 1225 of the meridian line 1223 located at the air outlet 125 are connected to form an X-axis line 1226, and the Y-axis line 1229 is arranged perpendicular to the X-axis line 1226. α is the angle between the first tangent line 1227 of the first endpoint 1224 and the X-axis line 1226, θ is the angle between the second tangent line 1228 of the second endpoint 1225 and the X-axis line 1226, β is the angle between the first tangent line 1227 and the second tangent line 1228, and L is the distance between the first endpoint 1224 and the second endpoint 1225. is the outer diameter of the wheel cover 122. Specifically, the motor 11 is located on the outer side of the wheel disc 121 away from the wheel cover 122. In this embodiment, the wheel disc 121 is provided with a mounting hole (not shown), which is coaxially arranged with the air inlet 1221. A steel ring 124 is arranged in the mounting hole. The mixed flow impeller 12 is sleeved on the drive shaft of the motor 11 through the steel ring 124, so that the drive shaft of the motor 11 drives the mixed flow impeller 12 to rotate around the axis of the air inlet 1221. Among them, one end of the blade 123 close to the air inlet 1221 is the leading edge 1231, the other end of the blade 123 close to the air outlet 125 is the trailing edge 1232, the side of the blade 123 adjacent to the inner surface 1222 of the wheel cover 122 is the lower edge 1234, and the other side of the blade 123 adjacent to the inner surface 1211 of the wheel disc 121 is the upper edge 1233.

The mixed flow impeller 12 of the mixed flow fan 1 of this embodiment is optimized by a parabolic equation for the meridian profile 1223 of the inner surface 1222 of the wheel cover 122 formed by rotating around the axis of the air inlet 1221, and the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 Multiple parameters are associated with each other, thereby ensuring that the meridian profile 1223 of the wheel cover 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction of the air outlet 125 of the mixed flow impeller 12 and the air inlet direction of the air inlet 1221 of the mixed flow impeller 12. While ensuring the air volume, the mixed flow impeller 12 of this embodiment can enable the airflow to obtain a larger pressure and flow rate, effectively suppress the boundary separation phenomenon of the airflow in the mixed flow impeller 12 due to the expansion pressure, and at the same time reduce or even eliminate the generation of vortices, thereby improving the flow efficiency of the airflow in the mixed flow impeller 12, and reducing the impact noise generated by the airflow at the air outlet 125 of the mixed flow impeller 12.

In order to further improve the flow efficiency of the airflow in the mixed flow impeller 12, further reduce the impact noise generated by the airflow at the outlet 125 of the mixed flow impeller 12, and further obtain a greater pressure, in this embodiment, the distance L between the first endpoint 1224 and the second endpoint 1225 is 34.3 mm, the angle β between the first tangent line 1227 and the second tangent line 1228 is 70°, and the coefficient a is 0.45, so as to uniquely confirm the meridian profile 1223 of the wheel cover 122 of the mixed flow impeller 12, take the first endpoint 1224 (X=0, Y=0) as the inlet endpoint of the wheel cover 122, and the second endpoint 1225 (X=34.3, Y=0) as the outlet endpoint of the wheel cover 122, through the equation The meridian profile 1223 of the wheel cover 122 can be obtained, wherein α=0.45×70°, θ=(1-0.45)×70°, that is, the meridian profile 1223 of the wheel cover 122 can be obtained by using a parabolic curve to transform the X and Y coordinates.

Among them, the inner surface 1211 of the wheel 121 of this embodiment is set in an arc line in the axial section of the air inlet 1221, so that the inner surface 1211 of the wheel 121 has good aerodynamic performance, and can further effectively ensure that an obtuse angle is formed between the air outlet direction of the air outlet 125 of the mixed flow impeller 12 and the air inlet direction of the air inlet 1221 of the mixed flow impeller 12. While ensuring the air volume, the mixed flow impeller 12 of this embodiment further enables the airflow to obtain a larger pressure and flow rate, while reducing the generation of vortices, improving the flow efficiency of the airflow in the mixed flow impeller 12, and reducing the impact noise generated by the airflow at the air outlet 125 of the mixed flow impeller 12. Specifically, the curvature direction of the arc line of the axial section of the inner surface 1211 of the wheel disc 121 of this embodiment at the air inlet 1221 is the same as the curvature direction of the meridian profile line 1223 of the wheel cover 122, and the width H2 of the air outlet 125 is greater than the width H1 between the inner surface 1211 of the wheel disc 121 and the inner surface 1222 of the wheel cover 122 close to the leading edge 1231 of the blade 123, so that the airflow obtains a greater pressure and flow rate. In addition, the outer peripheral diameter of the wheel cover 122 of this embodiment is is larger than the outer diameter D of the wheel disc 121, or the outer diameter D of the wheel cover 122 The diameter D of the outer periphery of the wheel disc 121 is smaller than that of the mixed flow impeller 12, so that the mixed flow impeller 12 can meet different use environments of the whole machine and improve the aerodynamic performance of the whole machine.

In addition, the blade 123 of the present embodiment is a three-dimensional twisted blade 123, so that the leading edge 1231 of the blade 123 is consistent with the airflow direction of the air inlet 1221, which can effectively eliminate the gas separation phenomenon in the mixed flow impeller 12, thereby effectively improving the inlet impact of the leading edge 1231 of the blade 123, and improving the flow efficiency of the airflow in the mixed flow impeller 12. Specifically, the connection position between the leading edge 1231 of the blade 123 of the present embodiment and the lower edge 1234 of the inner surface 1222 of the blade 123 adjacent to the wheel cover 122 is a fillet 1236, the angle between the leading edge 1231 of the blade 123 and the lower edge 1234 of the inner surface 1222 of the blade 123 adjacent to the wheel cover 122 is between 70° and 110°, and the leading edge 1231 of the blade 123 and the lower edge 1234 of the inner surface 1222 of the blade 123 adjacent to the wheel cover 121 are 1236. The angle between the leading edge 1231 of the blade 123 and the upper edge 1233 of the inner surface 1211 of the blade 123 is between 70° and 110°, the angle between the trailing edge 1232 of the blade 123 and the lower edge 1234 of the inner surface 1222 of the blade 123 adjacent to the wheel cover 122 is between 70° and 110°, and the angle between the trailing edge 1232 of the blade 123 and the upper edge 1233 of the inner surface 1211 of the blade 123 adjacent to the wheel disk 121 is between 70° and 110°. Further, the leading edge 1231 of the blade 123 and the trailing edge 1232 of the blade 123 are formed using a single curvature profile line, such as a straight line or a single arc line.

In order to simplify the processing technology and solve the problems of complex processing procedures, difficult processing and manufacturing, high mold and production costs, high defective rate, low production efficiency, etc., the steel ring 124 and the wheel disc 121 of this embodiment are an integrally formed structure, and the wheel disc 121 and the blade 123 are an integrally formed structure, that is, the steel ring 124, the wheel disc 121 and the blade 123 are integrally molded by injection molding. Among them, the lower edge 1234 of the blade 123 adjacent to the inner surface 1222 of the wheel cover 122 of this embodiment is protrudingly provided with a positioning block 1235, and the wheel cover 122 is penetrated with a positioning hole 1230. The positioning block 1235 passes through the positioning hole 1230 and is welded to connect the lower edge 1234 of the blade 123D with the wheel cover 122, thereby connecting the blade 123 with the wheel cover 122 to form the mixed flow impeller 12 of this embodiment. Specifically, in this embodiment, the number of positioning blocks 1235 and positioning holes 1230 are at least two respectively, and multiple positioning blocks 1235 are arranged side by side in the extension direction of the lower edge 1234 of the blade 123. One positioning block 1235 passes through one positioning hole 1230 and is welded to connect the lower edge 1234 to the wheel cover 122, so that the blade 123 and the wheel cover 122 are firmly and securely connected.

Referring to Figure 7, the mixed flow fan 1 of this embodiment is used in an air purifier 3. An obtuse angle is formed between the air outlet direction 125 of the mixed flow impeller 12 in the mixed flow fan 1 of this embodiment and the air inlet direction 1221 of the mixed flow impeller 12, so that the air outlet direction is directed obliquely upward in the vertical direction, thereby reducing the flow loss in the air outlet process, improving the flow efficiency of the airflow in the mixed flow impeller 12, and reducing the impact noise generated by the airflow hitting the shell wall of the air purifier 3.

Refer to Figure 8, which is a noise curve comparison diagram of the mixed flow fan 1 of this embodiment and the existing mixed flow fan at the same air volume. It can be seen from Figure 8 that since the mixed flow impeller 12 of the mixed flow fan 1 of this embodiment is optimized by the parabolic equation of the meridian profile 1223 of the inner surface 1222 of the wheel cover 122 formed by rotating around the axis of the air inlet 1221, the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 are optimized by the parabolic equation, and the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 Multiple parameters are associated with each other to ensure that the meridian profile 1223 of the wheel cover 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction 125 of the mixed flow impeller 12 and the air inlet direction 1221 of the mixed flow impeller 12. While ensuring the air volume, the overall noise sound pressure level of the mixed flow fan 1 of this embodiment is effectively reduced compared with the existing mixed flow fan, thereby reducing energy consumption, improving the flow efficiency of the airflow in the mixed flow impeller 12, and providing a better user experience.

Referring to Figures 9 to 12, Figure 9 is a flow field distribution diagram of the existing mixed flow fan in the Y-Z section, Figure 10 is a flow field distribution diagram of the mixed flow fan 1 of the present embodiment in the Y-Z section, Figure 11 is a flow field distribution diagram of the existing mixed flow fan in the X-Y section, and Figure 12 is a flow field distribution diagram of the mixed flow fan 1 of the present embodiment in the X-Y section. By comparing FIG. 10 with FIG. 9 , and FIG. 12 with FIG. 11 , since the mixed flow impeller 12 of the mixed flow fan 1 of the present embodiment is optimized by a parabolic equation for the meridian profile 1223 of the inner surface of the wheel cover 122 formed by rotating around the axis of the air inlet 1221, the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis line 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis line 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 Multiple parameters are associated with each other to ensure that the meridian profile 1223 of the wheel cover 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction 125 of the mixed flow impeller 12 and the air inlet direction 1221 of the mixed flow impeller 12. While ensuring the air volume, compared with the existing mixed flow fan in which the air inlet gas flow is not smooth and the air outlet airflow directly hits the shell wall to generate impact noise, the mixed flow fan 1 in this embodiment has smooth gas flow at the air inlet 1221, thereby improving the smoothness of the flow field in the mixed flow fan 1, which can effectively reduce the flow loss of the fluid and reduce the impact noise generated by the outlet airflow of the air outlet 125.

Referring to Figures 13 to 16, Figure 13 is a pressure distribution diagram of the suction surface of the blade of the existing mixed flow fan, Figure 14 is a pressure distribution diagram of the suction surface of the blade 123 in the mixed flow fan 1 of the present embodiment, Figure 15 is a pressure distribution diagram of the pressure surface of the blade of the existing mixed flow fan, and Figure 16 is a pressure distribution diagram of the pressure surface of the blade 123 in the mixed flow fan 1 of the present embodiment. By comparing FIG. 14 with FIG. 13 , and FIG. 16 with FIG. 15 , since the mixed flow impeller 12 of the mixed flow fan 1 of the present embodiment is optimized by a parabolic equation for the meridian profile 1223 of the inner surface of the wheel cover 122 formed by rotating around the axis of the air inlet 1221, the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis line 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis line 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 Multiple parameters are associated with each other to ensure that the meridian profile 1223 of the wheel cover 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction 125 of the mixed flow impeller 12 and the air inlet direction 1221 of the mixed flow impeller 12, and the blade 123 of this embodiment is a three-dimensional twisted blade 123, so that the low-pressure area of the suction surface of the blade 123 in the mixed flow fan 1 of this embodiment is larger, the gradient change is more uniform, and the pressure gradient equipotential lines of the pressure surface of the blade 123 in the mixed flow fan 1 of this embodiment are almost perpendicular to the streamlines of the blade 123, and the pressure gradient distribution is more reasonably optimized.

Referring to Figures 17 to 20, Figure 17 is a relative velocity vector diagram of the suction surface of the blade of the existing mixed flow fan, Figure 18 is a relative velocity vector diagram of the suction surface of the blade 123 in the mixed flow fan 1 of this embodiment, Figure 19 is a relative velocity vector diagram of the pressure surface of the blade of the existing mixed flow fan, and Figure 20 is a relative velocity vector diagram of the pressure surface of the blade 123 in the mixed flow fan 1 of this embodiment. By comparing FIG. 18 with FIG. 17 , and FIG. 20 with FIG. 19 , since the mixed flow impeller 12 of the mixed flow fan 1 of the present embodiment is optimized by a parabolic equation for the meridian profile 1223 of the inner surface of the wheel cover 122 formed by rotating around the axis of the air inlet 1221, the coefficient a, the angle α between the first tangent line 1227 of the first endpoint 1224 and the X-axis line 1226, the angle θ between the second tangent line 1228 of the second endpoint 1225 and the X-axis line 1226, the angle β between the first tangent line 1227 and the second tangent line 1228, the distance L between the first endpoint 1224 and the second endpoint 1225, and the outer peripheral diameter of the wheel cover 122 Multiple parameters are associated to ensure that the meridian profile 1223 of the wheel cover 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has good aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the outlet direction of the air outlet 125 of the mixed flow impeller 12 and the inlet direction of the air inlet 1221 of the mixed flow impeller 12, and the blade 123 of this embodiment is a three-dimensional twisted blade 123, and compared with the existing mixed flow fan blades, there is a large area of reflux near the air inlet, and there is also fluid separation near the air outlet, that is, as shown in Figures 17 and 19, the air flow density of the blades of the existing mixed flow fan near the air inlet is relatively sparse and separated, indicating that a large area of reflux occurs near the air inlet, Moreover, the air flow density of the blades of the existing mixed flow fan near the air outlet is relatively sparse and separated, indicating that fluid separation occurs near the air outlet, while the backflow phenomenon of the blades 123 near the air inlet 1221 in the mixed flow fan 1 of this embodiment is significantly reduced, and the fluid separation near the air outlet 125 is also significantly reduced, thereby greatly reducing the fluid separation loss. As shown in Figures 18 and 20, the air flow density of the blades 123 near the air inlet 1221 in the mixed flow fan 1 of this embodiment is relatively dense, indicating that the backflow phenomenon near the air inlet is significantly reduced, and the air flow density of the blades 123 near the air outlet 125 in the mixed flow fan 1 of this embodiment is relatively dense, indicating that the fluid separation loss near the air outlet 125 is significantly reduced.

Referring to Figures 21 to 27, Figure 21 is a schematic diagram of the six cross-sectional positions of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment for simulating the flow distribution on the rotating surface, Figure 22 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the first section, Figure 23 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the second section, Figure 24 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the third section, Figure 25 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the fourth section, Figure 26 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the fifth section, and Figure 27 is a flow distribution diagram of the rotating surface of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at the sixth section. It can be seen from Figures 21 to 27 that the overall internal flow condition of the mixed flow impeller 12 of this embodiment is significantly improved, the vortex in the flow channel has disappeared, and the overall airflow flows more smoothly.

During the experimental simulation of the mixed flow fan 1 of this embodiment, the following experimental data were obtained.

It can be concluded from the numerical simulation results that the mixed flow fan 1 of this embodiment can basically achieve the flow rate achieved by the existing mixed flow fan at a higher speed at a low speed, and the static pressure is increased by 6.62Pa, the shaft power consumption is reduced by 1.15W, and the static pressure efficiency is increased by 4.79%, thereby obtaining a larger pressure and saving energy.

In addition, the mixed flow fan 1 of this embodiment can be used in other household appliances, such as air conditioners, range hoods, fans, vacuum cleaners, ventilators, etc.

The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims (14)

1. The utility model provides a mixed flow impeller, includes rim plate, wheel cap and a plurality of blade, the axle center of wheel cap has run through and has seted up the air intake, and a plurality of the blade is connected the internal surface of rim plate with between the internal surface of wheel cap and be in the circumference of air intake is upwards arranged, the rim plate with the wheel cap is kept away from be formed with the air outlet between the outer periphery of air intake, the internal surface of wheel cap is by a plurality of meridian type lines winds the axis rotation of air intake forms its characterized in that:

The molded line of the axial section of the air inlet on the inner surface of the wheel disc is arranged in an arc line, the meridian molded line is arranged in a parabolic manner, and the meridian molded line is concavely bent towards the wheel disc;

any point of the meridian line lies in the equation On a constituted parabola, wherein，，，，；

The first end point of the meridian line positioned at the air inlet and the second end point of the meridian line positioned at the air outlet are connected to form an X axis, the Y axis is perpendicular to the X axis,Is the angle between the first tangent line of the first end point and the X axis,Is the angle between the second tangent line of the second end point and the X axis,For the angle between the first tangent line and the second tangent line,For the distance between the first end point and the second end point,Is the outer peripheral diameter of the wheel cover.

2. The mixed flow impeller of claim 1, wherein:

the blade is close to one end of the air inlet is a front edge, and the width of the air outlet is larger than the width between the inner surface of the wheel disc and the inner surface of the wheel cover, which is close to the front edge.

3. The mixed flow impeller of claim 1, wherein:

34.3 mm; and/or the number of the groups of groups, 70 °; And/or the number of the groups of groups,0.45.

4. The mixed flow impeller of claim 1, wherein:

The bending direction of the arc line is the same as the bending direction of the meridian plane line.

5. The mixed flow impeller of claim 1, wherein:

The outer peripheral diameter of the wheel cover is larger than the outer peripheral diameter of the wheel disc;

or the outer peripheral diameter of the wheel cover is smaller than the outer peripheral diameter of the wheel disc.

6. The mixed flow impeller of claim 1, wherein:

The blade is a ternary twisted blade.

7. The mixed flow impeller of claim 1, wherein:

One end of the blade, which is close to the air inlet, is a front edge, and the other end of the blade, which is close to the air outlet, is a rear edge;

The connection position between the front edge and the lower edge of the blade adjacent to the inner surface of the wheel cover is a round angle;

and/or an angle between the leading edge and a lower edge of the blade abutting an inner surface of the shroud is between 70 ° and 110 °;

and/or an angle between the leading edge and an upper edge of the blade abutting an inner surface of the disk is between 70 ° and 110 °;

And/or an angle between the trailing edge and a lower edge of the blade abutting an inner surface of the shroud is between 70 ° and 110 °;

And/or an included angle between the trailing edge and an upper edge of the blade abutting an inner surface of the disk is between 70 ° and 110 °.

8. The mixed flow impeller of claim 1, wherein:

the wheel disc is provided with a mounting hole, the mounting hole and the air inlet are coaxially arranged, and a steel ring is arranged in the mounting hole.

9. The mixed flow impeller of claim 8, wherein:

The steel ring and the wheel disc are of an integrated structure;

and/or the wheel disc and the blade are of an integrated structure.

10. The mixed flow impeller according to any one of claims 1 to 9, wherein:

The lower edge of the blade adjacent to the inner surface of the wheel cover is convexly provided with a positioning block, the wheel cover is provided with a positioning hole in a penetrating way, and the positioning block penetrates through the positioning hole and is welded to enable the lower edge to be connected with the wheel cover.

11. The mixed flow impeller according to claim 10, wherein:

The number of the positioning blocks and the number of the positioning holes are at least two respectively, a plurality of positioning blocks are arranged side by side in the extending direction of the lower edge, one positioning block penetrates through one positioning hole and is welded to enable the lower edge to be connected with the wheel cover.

12. Mixed flow fan, including mixed flow impeller, its characterized in that:

the mixed flow impeller is the mixed flow impeller according to any one of claims 1 to 11.

13. Air purifier, including mixed flow fan, its characterized in that:

the mixed flow fan is the mixed flow fan of claim 12.

14. Household appliance, including mixed flow fan, its characterized in that:

the mixed flow fan is the mixed flow fan of claim 12.