CN114483619A - Mixed flow impeller, mixed flow fan, air purifier and household appliance - Google Patents
Mixed flow impeller, mixed flow fan, air purifier and household appliance Download PDFInfo
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- CN114483619A CN114483619A CN202111629399.6A CN202111629399A CN114483619A CN 114483619 A CN114483619 A CN 114483619A CN 202111629399 A CN202111629399 A CN 202111629399A CN 114483619 A CN114483619 A CN 114483619A
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- 229910000831 Steel Inorganic materials 0.000 claims description 8
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- 230000000149 penetrating effect Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 241000764238 Isis Species 0.000 claims 1
- 238000004804 winding Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 33
- 238000009826 distribution Methods 0.000 description 23
- 238000000926 separation method Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 5
- 230000002596 correlated effect Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 238000009792 diffusion process Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/002—Details, component parts, or accessories especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
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Abstract
The invention provides a mixed flow impeller, a mixed flow fan, an air purifier and a household appliance, wherein the mixed flow impeller comprises a wheel disc, a wheel cover and a plurality of blades, an air inlet penetrates through the axis of the wheel cover, the blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and are distributed in the circumferential direction of the air inlet, an air outlet is formed between the wheel disc and the outer periphery of the wheel cover far away from the air inlet, the inner surface of the wheel cover is formed by rotating a plurality of meridian plane lines around the axis of the air inlet, the profile line of the inner surface of the wheel disc on the axial section of the air inlet is arranged in an arc line, the meridian plane profile line is arranged in a parabola line, and the meridian plane profile line is inwards bent towards the wheel disc. According to the mixed flow impeller, meridian plane molded lines of the impeller cover and molded lines of the impeller disc are optimally designed, so that the inner surface of the impeller disc and the inner surface of the impeller cover have good aerodynamic performance, high airflow pressure and flow are obtained, the generation of vortex is reduced, the flow efficiency of airflow is improved, and impact noise generated by outlet airflow of the mixed flow impeller is reduced.
Description
Technical Field
The invention relates to the technical field of mixed flow fans, in particular to a mixed flow impeller, a mixed flow fan with the mixed flow impeller, an air purifier with the mixed flow fan and a household appliance with the mixed flow fan.
Background
The mixed flow fan is a fan between the axial flow fan and the centrifugal fan, and the impeller of the mixed flow fan enables air to do centrifugal motion and axial motion, so that the motion of the air in the shell of the mixed flow fan is mixed with two motion forms of axial flow and centrifugation, and the mixed flow fan has the advantages of higher air pressure coefficient than the axial flow fan and higher flow coefficient than the centrifugal fan.
The impeller of the mixed flow fan mainly comprises a wheel disc, a wheel cover and a plurality of blades, wherein the blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and are uniformly distributed in the circumferential direction of the impeller, the inner surface of the wheel disc is formed by rotating a plurality of first meridian plane profiles around the axis of the impeller, and the inner surface of the wheel cover is formed by rotating a plurality of second meridian plane profiles around the axis of the impeller. The flow field in the flow channel, which is obviously related to the first meridian profile of the disk and the second meridian profile of the shroud, in addition to being influenced by the profile of the outer blade, plays a decisive role in the performance of the entire machine. The air inlet of the impeller is arranged on the wheel cover, so that the wheel cover not only has a flow guide function, but also has a flow collection function, and the second meridian profile of the wheel cover has a particularly obvious influence on a flow field in the air flow channel. Due to the fact that the second meridian plane molded line of the existing wheel cover is not sufficiently optimized, the performance of a flow field in an airflow channel is reduced, and then noise of the impeller is increased and the energy efficiency ratio is reduced.
Disclosure of Invention
In order to achieve the first object of the present invention, the present invention provides a mixed flow impeller with high efficiency and low noise, which can make the airflow obtain larger pressure and flow rate, reduce the generation of vortex, improve the flow efficiency of the airflow in the mixed flow impeller, and reduce the impact noise generated by the outlet airflow of the mixed flow impeller.
In order to achieve the second object of the present invention, the present invention provides a mixed flow fan having the above mixed flow impeller.
In order to achieve the third object of the present invention, the present invention provides an air purifier having the mixed flow fan.
In order to achieve the fourth object of the present invention, the present invention provides a household appliance having the mixed flow fan.
In order to achieve the first purpose of the invention, the invention provides a mixed flow impeller which comprises a wheel disc, a wheel cover and a plurality of blades, wherein an air inlet is formed in the axis of the wheel cover in a penetrating mode, the blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and distributed in the circumferential direction of the air inlet, an air outlet is formed between the wheel disc and the outer periphery, far away from the air inlet, of the wheel cover, the inner surface of the wheel cover is formed by rotating a plurality of meridian plane lines around the axis of the air inlet, the profile line of the inner surface of the wheel disc on the axial section of the air inlet is arranged in an arc line, the meridian plane profile line is arranged in a parabola line, and the meridian plane profile line is inwards bent towards the wheel disc.
The proposal shows that the mixed flow impeller of the mixed flow fan carries out parabolic optimization design on a meridian profile line which rotates around the axis of the air inlet to form the inner surface of the impeller cover, and the molded line of the inner surface of the wheel disc on the axial section of the air inlet is optimally designed to ensure that the inner surface of the wheel disc and the inner surface of the wheel cover have better aerodynamic performance, and can effectively ensure that an obtuse angle is formed between the air outlet direction of the air outlet of the mixed flow impeller and the air inlet direction of the air inlet of the mixed flow impeller, the mixed flow impeller of the invention can ensure that the airflow obtains larger pressure and flow while ensuring the air quantity, effectively inhibit the boundary separation phenomenon formed by diffusion of the airflow in the mixed flow impeller, meanwhile, the generation of vortex is reduced or even eliminated, the flow efficiency of the air flow in the mixed flow impeller is improved, and the impact noise generated by the air outlet air flow of the air outlet of the mixed flow impeller is reduced.
The further scheme is that one end of each blade, which is close to the air inlet, is a front edge, and the width of the air outlet is larger than the width, which is close to the front edge, between the inner surface of the wheel disc and the inner surface of the wheel cover.
Further, any point of the meridian plane line is located in the equation
A parabola is formed, wherein alpha is a multiplied by beta, theta is (1-a) multiplied by beta, a is more than or equal to 0.25 and less than or equal to 0.75, beta is more than or equal to 50 and less than or equal to 90 degrees,
the meridian plane molded line is connected between a first end point of the meridian plane molded line positioned at the air inlet and a second end point of the meridian plane molded line positioned at the air outlet to form an X axis, the Y axis is arranged perpendicular to the X axis, alpha is an included angle between a first phase tangent of the first end point and the X axis, theta is an included angle between a second phase tangent of the second end point and the X axis, beta is an included angle between the first phase tangent and the second phase tangent, and L is a distance between the first end point and the second end point,
is the outer peripheral diameter of the wheel cover.
In a further aspect, L is 34.3 mm; and/or, β is 70 °; and/or, a is 0.45.
Further, the bending direction of the arc line is the same as that of the meridian plane line.
The further proposal is that the outer periphery diameter of the wheel cover is larger than that of the wheel disc; alternatively, the outer peripheral diameter of the wheel cover is smaller than the outer peripheral diameter of the wheel disc.
In a further scheme, the blade is a ternary twisted blade.
The further proposal is that one end of the blade close to the air inlet is a front edge, the other end of the blade close to the air outlet is a rear edge, and the connecting position between the front edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is a fillet; and/or the included angle between the front edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is 70-110 degrees; and/or the angle between the leading edge and the upper edge of the inner surface of the blade adjacent to the disk is between 70 and 110 degrees; and/or the included angle between the rear edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is 70-110 degrees; and/or the trailing edge is angled between 70 ° and 110 ° to the upper edge of the inner surface of the blade adjacent the disk.
The further scheme is that 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.
The further proposal is that the steel ring and the wheel disc are in an integrated structure; and/or the wheel disc and the blades are of an integrally formed structure.
The further proposal is that 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 passes through the positioning hole and is welded to connect the lower edge with the wheel cover.
The further proposal is that the number of the positioning blocks and the 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 with the wheel cover.
In order to achieve the second object of the present invention, the present invention provides a mixed flow fan, which includes a mixed flow impeller, wherein the mixed flow impeller is the above mixed flow impeller.
In order to achieve the third object of the present invention, the present invention provides an air purifier, which includes a mixed flow fan, wherein the mixed flow fan is the above mixed flow fan.
In order to achieve the fourth object of the present invention, the present invention provides a household appliance, which includes a mixed flow fan, wherein the mixed flow fan is the above mixed flow fan.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of a mixed flow fan of the present invention.
FIG. 2 is a block 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 a mixed flow impeller in an embodiment of a mixed flow fan 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 view of meridian plane lines of a mixed-flow impeller in an embodiment of the mixed-flow fan of the invention.
FIG. 6 is a partial structure diagram of a mixed flow impeller in an embodiment of the 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 as applied to an air cleaner.
FIG. 8 is a comparison graph of noise curves of the mixed-flow fan of the present invention and the existing mixed-flow fan at the same air volume.
FIG. 9 is a flow field distribution diagram of a conventional mixed flow fan in a Y-Z section.
FIG. 10 is a flow field distribution diagram of a mixed flow fan embodiment of the present invention in a Y-Z cross section.
FIG. 11 is a flow field distribution diagram of a conventional mixed flow fan in an X-Y section.
FIG. 12 is a flow field distribution diagram of an embodiment of a mixed flow fan of the present invention in an X-Y cross section.
FIG. 13 is a pressure profile of a suction side of a blade of a prior art mixed flow fan.
FIG. 14 is a pressure profile of the suction side of a blade in an embodiment of a mixed flow fan according to the invention.
FIG. 15 is a pressure profile of a pressure side of a blade of a prior art mixed flow fan.
FIG. 16 is a pressure profile of the pressure side of a blade in an embodiment of a mixed flow fan 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 side of a blade in an embodiment of a mixed flow fan of the present invention.
FIG. 19 is a relative velocity vector diagram of the pressure side of a blade of a prior art mixed flow fan.
FIG. 20 is a vector diagram of the relative velocity of the pressure surfaces of the blades in an embodiment of a mixed flow fan of the present invention.
FIG. 21 is a schematic diagram of six cross-sectional positions of a mixed flow impeller for performing a surface-of-revolution flow distribution simulation in an embodiment of a mixed flow fan according to the present invention.
FIG. 22 is a cross-sectional flow profile of a mixed flow impeller at a first cross-section in an embodiment of a mixed flow fan of the present invention.
FIG. 23 is a surface-of-revolution flow profile of a mixed flow impeller in a second cross-section of a mixed flow fan embodiment of the invention.
FIG. 24 is a surface-of-revolution flow distribution diagram of a mixed flow impeller at a third cross-section in an embodiment of a mixed flow fan of the present invention.
FIG. 25 is a cross-sectional view of a mixed flow impeller at a fourth cross-sectional area of a mixed flow fan embodiment of the present invention.
FIG. 26 is a surface-of-revolution flow distribution diagram of a mixed flow impeller at a fifth cross-section in a mixed flow fan embodiment of the invention.
FIG. 27 is a cross-sectional flow distribution diagram of a mixed flow impeller at a sixth cross-section in an embodiment of a mixed flow fan of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Referring to fig. 1 to 6, the present embodiment discloses a mixed flow fan 1, including a motor 11 and a mixed flow impeller 12, where the mixed flow impeller 12 includes a wheel disc 121, a wheel cover 122 and a plurality of blades 123, an air inlet 1221 penetrates through an axis of the wheel cover 122, the plurality of blades 123 are connected between an inner surface 1211 of the wheel disc 121 and an inner surface 1222 of the wheel cover 122 and are uniformly arranged in a circumferential direction of the air inlet 1221, an air outlet 125 is formed between outer peripheries of the wheel disc 121 and the wheel cover 122 far from the air inlet 1221, and the inner surface 1222 of the wheel cover 122 is formed by a plurality of meridian plane lines 1223 rotating around an axis of the air inlet 1221. Any point of the meridian plane line 1223 of this embodiment lies in the equation
A parabola is formed, wherein alpha is a multiplied by beta, theta is (1-a) multiplied by beta, a is more than or equal to 0.25 and less than or equal to 0.75, beta is more than or equal to 50 and less than or equal to 90 degrees,
meridian planeThe line 1223 is connected between a first end point 1224 of the air inlet 1221 and a second end point 1225 of the meridian line 1223 at the air outlet 125 to form an X-axis 1226, the Y-axis 1229 is perpendicular to the X-axis 1226, α is an angle between a first tangent line 1227 of the first end point 1224 and the X-axis 1226, θ is an angle between a second tangent line 1228 of the second end point 1225 and the X-axis 1226, β is an angle between the first tangent line 1227 and the second tangent line 1228, L is a distance between the first end point 1224 and the second end point 1225,
is the outer peripheral diameter of the wheel cover 122. Specifically, the motor 11 is located on the outer side of the wheel disc 121 far away from the wheel cover 122, the wheel disc 121 is provided with a mounting hole (not labeled) in the embodiment, the mounting hole is coaxially arranged with the air inlet 1221, a steel ring 124 is arranged in the mounting hole, and the mixed-flow impeller 12 is sleeved on the driving shaft of the motor 11 through the steel ring 124, so that the driving shaft of the motor 11 drives the mixed-flow impeller 12 to rotate around the axis of the air inlet 1221. The end of the vane 123 close to the air inlet 1221 is a front edge 1231, the other end of the vane 123 close to the air outlet 125 is a rear edge 1232, one side of the vane 123 adjacent to the inner surface 1222 of the wheel cover 122 is a lower edge 1234, and the other side of the vane 123 adjacent to the inner surface 1211 of the wheel disc 121 is an upper edge 1233.
The mixed-flow impeller 12 of the mixed-flow fan 1 of the present embodiment is optimally designed by a parabolic equation for a meridian line 1223 that rotates around the axis of the air inlet 1221 to form the inner surface 1222 of the shroud 122, and has a coefficient a, an angle α between a first tangent line 1227 of the first end point 1224 and the X-axis 1226, an angle θ between a second tangent line 1228 of the second end point 1225 and the X-axis 1226, an angle β between the first tangent line 1227 and the second tangent line 1228, a distance L between the first end point 1224 and the second end point 1225, and an outer peripheral diameter of the shroud 122
Several parameters are associated to ensure that the meridian profile 1223 of the shroud 122 forms a smooth, continuous parabolic curve, so that the inner surface 1222 of the shroud 122 has better aerodynamic performance and can effectively ensure mixed flow impellerAn 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, so that while the air volume is ensured, the mixed-flow impeller 12 of the present embodiment can enable the air flow to obtain larger pressure and flow, effectively inhibit the boundary separation phenomenon caused by diffusion of the air flow in the mixed-flow impeller 12, reduce or even eliminate the generation of vortex, improve the flow efficiency of the air flow in the mixed-flow impeller 12, and reduce the impact noise generated by the air outlet flow of the air outlet 125 of the mixed-flow impeller 12.
In order to further improve the flow efficiency of the air flow in the mixed flow impeller 12, further reduce the impact noise generated by the air flow at the air outlet 125 of the mixed flow impeller 12, and further obtain a larger pressure, the distance L between the first end point 1224 and the second end point 1225 is 34.3 mm, the included 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 identify the meridian line 1223 of the shroud 122 of the mixed flow impeller 12, where the first end point 1224(X is 0, Y is 0) is used as the inlet end point of the shroud 122, the second end point 1225(X is 34.3, Y is 0) is used as the outlet end point of the shroud 122, and by using the equation, the first end point 1224(X is 34.3, Y is 0) is used as the outlet end point of the shroud 122
A meridian line 1223 of the wheel cover 122 can be obtained, where α is 0.45 × 70 °, and θ is (1-0.45) × 70 °, that is, the meridian line 1223 of the wheel cover 122 can be obtained by transforming the parabolic curve with X, Y coordinates.
The profile of the axial cross section of the inner surface 1211 of the wheel disc 121 in this embodiment is an arc-shaped line at the air inlet 1221, so that the inner surface 1211 of the wheel disc 121 has a better aerodynamic performance, and further, an obtuse angle can be effectively ensured to be 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 in this embodiment further enables the air flow to obtain a larger pressure and flow, and simultaneously reduces the generation of a vortex, improves the flow efficiency of the air flow in the mixed-flow impeller 12, and reduces the impact noise generated by the air outlet flow of the air outlet 125 of the mixed-flow impeller 12. Specifically, the inner surface 1211 of disk 121 of the present embodiment is positioned at air inlet 1221The curvature of the arc line of the axial section is in the same direction as the curvature of the meridian line 1223 of the shroud 122, and the width H2 of the outlet 125 is greater than the width H1 between the inner surface 1211 of the disk 121 and the inner surface 1222 of the shroud 122, close to the leading edge 1231 of the blade 123, so that a greater pressure and flow rate of the air flow is obtained. In addition, the outer peripheral diameter of the wheel cover 122 of the present embodiment
Is larger than the outer peripheral diameter D of the wheel disc 121 or the outer peripheral diameter of the wheel cover 122
The diameter of the mixed flow impeller 12 is smaller than the diameter D of the outer periphery of the wheel disc 121, so that the mixed flow impeller 12 can meet different use environments of the whole machine, and the pneumatic performance of the whole machine is improved.
In addition, the vane 123 of this embodiment is a ternary twisted vane 123, so that the leading edge 1231 of the vane 123 fits with the airflow direction of the air inlet 1221, and the gas separation phenomenon in the mixed flow impeller 12 can be effectively eliminated, thereby effectively improving the inlet impact of the leading edge 1231 of the vane 123 and improving the flow efficiency of the airflow in the mixed flow impeller 12. Specifically, in the present embodiment, the connecting position between the front edge 1231 of the vane 123 and the lower edge 1234 of the vane 123 adjacent to the inner surface 1222 of the wheel cover 122 is a rounded corner 1236, the angle between the front edge 1231 of the vane 123 and the lower edge 1234 of the vane 123 adjacent to the inner surface 1222 of the wheel cover 122 is 70 ° to 110 °, the angle between the front edge 1231 of the vane 123 and the upper edge 1233 of the vane 123 adjacent to the inner surface 1211 of the wheel disc 121 is 70 ° to 110 °, the angle between the rear edge 1232 of the vane 123 and the lower edge 1234 of the vane 123 adjacent to the inner surface 1222 of the wheel cover 122 is 70 ° to 110 °, and the angle between the rear edge 1232 of the vane 123 and the upper edge 1233 of the vane 123 adjacent to the inner surface 1211 of the wheel disc 121 is 70 ° to 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, such as a straight line or a single circular arc.
In order to simplify the processing technology and solve the problems of complex processing procedure, difficult processing and manufacturing, high mold and production cost, high reject ratio, low production efficiency and the like, the steel ring 124 and the wheel disc 121 are in an integrally formed structure, and the wheel disc 121 and the blades 123 are in an integrally formed structure, i.e. the steel ring 124, the wheel disc 121 and the blades 123 are integrally injection molded and demoulded. A positioning block 1235 is convexly disposed on a lower edge 1234 of the vane 123 adjacent to the inner surface 1222 of the shroud 122 in this embodiment, a positioning hole 1230 is formed through the shroud 122, and the positioning block 1235 passes through the positioning hole 1230 and is welded to connect the lower edge 1234 of the vane 123D with the shroud 122, so as to connect the vane 123 and the shroud 122 to form the mixed flow impeller 12 in this embodiment. Specifically, in this embodiment, the number of the positioning blocks 1235 and the positioning holes 1230 is at least two, the positioning blocks 1235 are arranged side by side in the extending direction of the lower edge 1234 of the blade 123, and one positioning block 1235 penetrates through one positioning hole 1230 and is welded to connect the lower edge 1234 with the wheel cover 122, so that the blade 123 and the wheel cover 122 are stably and firmly connected.
Referring to fig. 7, the mixed flow fan 1 of the present embodiment is applied to the air purifier 3, and an obtuse angle is formed between an air outlet direction of the air outlet 125 of the mixed flow impeller 12 in the mixed flow fan 1 and an air inlet direction of the air inlet 1221 of the mixed flow impeller 12, so that the air outlet direction is inclined upward in the vertical direction, thereby reducing the flow loss during the air outlet process, improving the flow efficiency of the air flow in the mixed flow impeller 12, and reducing the impact noise generated when the air flow impacts the wall surface of the housing of the air purifier 3.
Referring to fig. 8, fig. 8 is a comparison graph of noise curves of the mixed flow fan 1 of the present embodiment and the existing mixed flow fan under the same air volume. As can be understood from fig. 8, since the mixed-flow impeller 12 of the mixed-flow fan 1 of the present embodiment is optimally designed by a parabolic equation for a meridian line 1223 that rotates around the axis of the air inlet 1221 to form the inner surface 1222 of the shroud 122, the coefficient a, the angle α between the first tangent line 1227 of the first end point 1224 and the X axis 1226, the angle θ between the second tangent line 1228 of the second end point 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 end point 1224 and the second end point 1225, and the outer peripheral diameter of the shroud 122 are calculated by using the equation of the parabola equation
Multiple parameters are correlated to ensure that the wheel cover 122 is securedMeridian plane type line 1223 forms smoothly, continuous parabola curve, make inner surface 1222 of wheel cap 122 have better aerodynamic performance, and can effectively ensure to form the obtuse angle between the air-out direction of air outlet 125 of mixed flow impeller 12 and the air inlet direction of air intake 1221 of mixed flow impeller 12, when guaranteeing the amount of wind, relatively current mixed flow fan, effectively reduce this embodiment mixed flow fan 1's whole noise sound pressure level, and then reduce the energy consumption, promote the flow efficiency of air current in the mixed flow impeller 12, make user experience better.
Referring to fig. 9 to 12, fig. 9 is a flow field distribution diagram of a conventional mixed flow fan in a Y-Z section, fig. 10 is a flow field distribution diagram of a mixed flow fan 1 in this embodiment in a Y-Z section, fig. 11 is a flow field distribution diagram of a conventional mixed flow fan in an X-Y section, and fig. 12 is a flow field distribution diagram of a mixed flow fan 1 in this embodiment in an X-Y section. By comparing fig. 10 and 9, and comparing fig. 12 and 11, since the mixed-flow impeller 12 of the mixed-flow fan 1 of the present embodiment is optimally designed by parabolic equations for the meridian line 1223 forming the inner surface of the shroud 122 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 end point 1224 and the X axis 1226, the angle θ between the second tangent line 1228 of the second end point 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 end point 1224 and the second end point 1225, and the outer peripheral diameter of the shroud 122 are optimally designed by the coefficient a
Multiple parameters are correlated to ensure that meridian profile lines 1223 of the wheel cover 122 form a smooth and continuous parabolic curve, so that the inner surface 1222 of the wheel cover 122 has better aerodynamic performance, and an obtuse angle can be effectively 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 air flow is not smooth compared with the air inlet air flow of the existing mixed flow fan and the air outlet air flow directly impacts the wall surface of the housing to generate impact noise, the air flow of the air inlet 1221 of the mixed flow fan 1 of the embodiment is smooth, thereby improving the smoothness of the flow field in the mixed flow fan 1, and effectively reducing the flow smoothness of the fluidDynamic loss and reduction of impact noise generated by the outlet airflow at the outlet 125.
Referring to fig. 13 to 16, fig. 13 is a pressure distribution diagram of a suction surface of a blade of a conventional mixed flow fan, fig. 14 is a pressure distribution diagram of a suction surface of a blade 123 in the mixed flow fan 1 of the present embodiment, fig. 15 is a pressure distribution diagram of a pressure surface of a blade of a conventional mixed flow fan, and fig. 16 is a pressure distribution diagram of a pressure surface of a blade 123 in the mixed flow fan 1 of the present embodiment. By comparing fig. 14 and 13, and comparing fig. 16 and 15, since the mixed-flow impeller 12 of the mixed-flow fan 1 of the present embodiment is optimally designed by parabolic equations for the meridian line 1223 forming the inner surface of the shroud 122 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 end point 1224 and the X axis 1226, the angle θ between the second tangent line 1228 of the second end point 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 end point 1224 and the second end point 1225, and the outer peripheral diameter of the shroud 122 are optimally designed by the coefficient a
The multiple parameters are correlated to ensure that the meridian profile 1223 of the shroud 122 forms a smooth and continuous parabolic curve, so that the inner surface 1222 of the shroud 122 has better 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, and the vane 123 of the present embodiment is a ternary twisted vane 123, so that the low-pressure area range of the suction surface of the vane 123 in the mixed flow fan 1 of the present embodiment is larger, the gradient change is more uniform, and the pressure gradient equipotential line of the pressure surface of the vane 123 in the mixed flow fan 1 of the present embodiment is almost perpendicular to the vane 123, and the pressure gradient distribution is more reasonably optimized.
Referring to fig. 17 to 20, fig. 17 is a relative velocity vector diagram of a suction surface of a blade of a conventional mixed flow fan, fig. 18 is a relative velocity vector diagram of a suction surface of a blade 123 in the mixed flow fan 1 of the present embodiment, fig. 19 is a relative velocity vector diagram of a pressure surface of a blade of a conventional mixed flow fan, and fig. 20 is a relative velocity vector diagram of a blade 1 of the mixed flow fan 1 of the present embodiment123 relative velocity vector diagram of the pressure surface. By comparing fig. 18 and 17, and comparing fig. 20 and 19, since the mixed-flow impeller 12 of the mixed-flow fan 1 of the present embodiment is optimally designed by parabolic equations for the meridian line 1223 forming the inner surface of the shroud 122 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 end point 1224 and the X axis 1226, the angle θ between the second tangent line 1228 of the second end point 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 end point 1224 and the second end point 1225, and the outer peripheral diameter of the shroud 122 are optimally designed by the coefficient a
Multiple parameters are correlated to ensure that meridian plane lines 1223 of the shroud 122 form a smooth and continuous parabolic curve, so that the inner surface 1222 of the shroud 122 has better aerodynamic performance, and can effectively ensure that an obtuse angle is formed between an air outlet direction of the air outlet 125 of the mixed-flow impeller 12 and an air inlet direction of the air inlet 1221 of the mixed-flow impeller 12, and the blade 123 of the present embodiment is a ternary twisted blade 123, which has a large area backflow phenomenon near the air inlet compared with the blade of the existing mixed-flow fan, and also has a fluid separation condition near the air outlet, that is, as shown in fig. 17 and 19, the blade of the existing mixed-flow fan has a sparse separation of airflow density near the air inlet, which indicates a large area backflow phenomenon near the air inlet, and the blade of the existing mixed-flow fan has a sparse separation of airflow density near the air outlet, which indicates a fluid separation phenomenon near the air outlet, however, in the mixed flow fan 1 of the present embodiment, the backflow phenomenon of the blade 123 near the air inlet 1221 is significantly reduced, and the fluid separation condition near the air outlet 125 is also significantly reduced, so as to greatly reduce the fluid separation loss, that is, as shown in fig. 18 and 20, the density of the airflow near the air inlet 1221 of the blade 123 in the mixed flow fan 1 of the present embodiment is relatively dense, which means that the backflow phenomenon near the air inlet is significantly reduced, and the density of the airflow near the air outlet 125 of the blade 123 in the mixed flow fan 1 of the present embodiment is relatively dense, which means that the fluid separation loss phenomenon near the air outlet 125 is relatively denseIs obviously reduced.
Referring to fig. 21 to 27, fig. 21 is a schematic diagram of six cross-sectional positions of a mixed flow impeller 12 in a mixed flow fan 1 of the present embodiment for performing a surface-of-revolution flow distribution simulation, fig. 22 is a surface-of-revolution flow distribution diagram of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at a first cross section, fig. 23 is a surface-of-revolution flow distribution diagram of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at a second cross section, fig. 24 is a surface-of-revolution flow distribution diagram of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at a third cross section, fig. 25 is a surface-of-revolution flow distribution diagram of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at a fourth cross section, fig. 26 is a surface-of-revolution flow impeller 12 in the mixed flow fan 1 of the present embodiment at a fifth cross section, and fig. 27 is a surface-of-revolution flow distribution diagram of the mixed flow impeller 12 in the mixed flow fan 1 of the present embodiment at a sixth cross section. As can be seen from fig. 21 to 27, the internal overall flow condition of the mixed-flow impeller 12 of the present embodiment is significantly improved, the vortex condition in the flow channel is not present, and the overall airflow flow is smoother.
In the experiment simulation process of the mixed flow fan 1 of the present embodiment, the following experiment data is obtained.
The numerical simulation result can show that the mixed flow fan 1 of the embodiment can basically reach the flow rate of the existing mixed flow fan at a high rotating speed at a low rotating speed, the static pressure is improved by 6.62Pa, the shaft power consumption is reduced by 1.15W, and the static pressure efficiency is improved by 4.79 percent, so that a large pressure is obtained, and the energy consumption is saved.
In addition, the mixed flow fan 1 of the present embodiment can be applied to other household appliances, such as air conditioners, range hoods, fans, dust collectors, ventilators, and the like.
The above embodiments are merely preferred examples of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications made based on the structure, characteristics and principles of the invention as claimed should be included in the claims of the present invention.
Claims (15)
1. The mixed flow impeller comprises a wheel disc, a wheel cover and a plurality of blades, wherein an air inlet is formed in the axis of the wheel cover in a penetrating mode, the blades are connected between the inner surface of the wheel disc and the inner surface of the wheel cover and distributed in the circumferential direction of the air inlet, an air outlet is formed between the outer periphery of the air inlet and the wheel cover, and the inner surface of the wheel cover is formed by winding a plurality of meridian plane type lines around the axis of the air inlet in a rotating mode, and the mixed flow impeller is characterized in that:
the molded lines of the axial cross section of the air inlet on the inner surface of the wheel disc are arranged in an arc line, the molded lines of the meridian plane are arranged in a parabola line, and the meridian plane molded lines face the wheel disc and are concavely bent.
2. The mixed-flow impeller according to claim 1, characterized in that:
the end, close to the air inlet, of each blade is a front edge, and the width of the air outlet is larger than the width, close to the front edge, between the inner surface of the wheel disc and the inner surface of the wheel cover.
3. The mixed-flow impeller according to claim 1, characterized in that:
any point of the meridian plane line is located in an equation
A parabola is formed, wherein alpha is a multiplied by beta, theta is (1-a) multiplied by beta, a is more than or equal to 0.25 and less than or equal to 0.75, beta is more than or equal to 50 and less than or equal to 90 degrees,
the meridian plane profile line is located between a first end point of the air inlet and a second end point of the meridian plane profile line located at the air outlet to form an X axis, a Y axis is perpendicular to the X axis, alpha is an included angle between a first tangent line of the first end point and the X axis, theta is an included angle between a second tangent line of the second end point and the X axis, and beta isIs an included angle between the first tangent line and the second tangent line, L is a distance between the first end point and the second end point,
is the outer peripheral diameter of the wheel cover.
4. The mixed-flow impeller according to claim 3, characterized in that:
l is 34.3 mm; and/or, β is 70 °; and/or, a is 0.45.
5. The mixed-flow impeller according to claim 1, characterized in that:
the bending direction of the arc line is the same as that of the meridian plane molded line.
6. The mixed-flow impeller according to claim 1, characterized in that:
the outer peripheral diameter of the wheel cover is larger than that of the wheel disc;
alternatively, the outer peripheral diameter of the wheel cover is smaller than the outer peripheral diameter of the wheel disc.
7. The mixed flow impeller of claim 1, wherein:
the blade is a ternary twisted blade.
8. The mixed-flow impeller according to claim 1, characterized in that:
one end of the blade close to the air inlet is a front edge, and the other end of the blade close to the air outlet is a rear edge;
the connecting position between the front edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is a fillet;
and/or the included angle between the front edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is 70-110 degrees;
and/or the included angle between the front edge and the upper edge of the inner surface of the blade adjacent to the wheel disc is 70-110 degrees;
and/or the included angle between the rear edge and the lower edge of the inner surface of the blade adjacent to the wheel cover is 70-110 degrees;
and/or the included angle between the trailing edge and the upper edge of the inner surface of the blade adjacent to the wheel disc is 70-110 degrees.
9. The mixed-flow impeller according to claim 1, characterized in that:
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.
10. The mixed-flow impeller of claim 9, wherein:
the steel ring and the wheel disc are of an integrally formed structure;
and/or the wheel disc and the blades are of an integrally formed structure.
11. The mixed flow impeller according to any one of claims 1 to 10, wherein:
the lower edge of the blade, which is 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.
12. The mixed-flow impeller of claim 11, wherein:
the number of the positioning blocks and the number of the positioning holes are at least two respectively, the positioning blocks are arranged side by side in the extending direction of the lower edge, and one positioning block penetrates through one positioning hole and is welded to enable the lower edge to be connected with the wheel cover.
13. Mixed flow fan, including mixed flow impeller, its characterized in that:
the mixed flow impeller of any one of claims 1 to 12.
14. Air purifier, including mixed flow fan, its characterized in that:
the mixed flow fan of claim 13.
15. Domestic appliance, including mixed flow fan, its characterized in that:
the mixed flow fan of claim 13.
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| CN202111629399.6A CN114483619A (en) | 2021-12-27 | 2021-12-27 | Mixed flow impeller, mixed flow fan, air purifier and household appliance |
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| CN202111629399.6A CN114483619A (en) | 2021-12-27 | 2021-12-27 | Mixed flow impeller, mixed flow fan, air purifier and household appliance |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162521A (en) * | 2005-12-12 | 2007-06-28 | Matsushita Electric Ind Co Ltd | Mixed flow blower impeller and air conditioner |
| US20150354584A1 (en) * | 2012-12-21 | 2015-12-10 | Daikin Industries, Ltd. | Centrifugal fan |
| CN107092763A (en) * | 2017-05-22 | 2017-08-25 | 宁波聚清源环保科技有限公司 | The three-dimensional design method of turbomachinery impeller with Castability |
| EP3235726A1 (en) * | 2016-04-22 | 2017-10-25 | Hamilton Sundstrand Corporation | Environmental control system utilizing enhanced compressor |
| CN108005948A (en) * | 2017-11-06 | 2018-05-08 | 大连理工大学 | Hydraulic model and water passage for large pressurized water reactor power station core main pump |
| CN111156191A (en) * | 2020-01-20 | 2020-05-15 | 珠海格力电器股份有限公司 | Impeller, mixed flow fan and air conditioner |
| CN112182792A (en) * | 2020-08-21 | 2021-01-05 | 西安交通大学 | Universal meridian flow channel design method for diagonal flow/centrifugal impeller |
-
2021
- 2021-12-27 CN CN202111629399.6A patent/CN114483619A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007162521A (en) * | 2005-12-12 | 2007-06-28 | Matsushita Electric Ind Co Ltd | Mixed flow blower impeller and air conditioner |
| US20150354584A1 (en) * | 2012-12-21 | 2015-12-10 | Daikin Industries, Ltd. | Centrifugal fan |
| EP3235726A1 (en) * | 2016-04-22 | 2017-10-25 | Hamilton Sundstrand Corporation | Environmental control system utilizing enhanced compressor |
| CN107092763A (en) * | 2017-05-22 | 2017-08-25 | 宁波聚清源环保科技有限公司 | The three-dimensional design method of turbomachinery impeller with Castability |
| CN108005948A (en) * | 2017-11-06 | 2018-05-08 | 大连理工大学 | Hydraulic model and water passage for large pressurized water reactor power station core main pump |
| CN111156191A (en) * | 2020-01-20 | 2020-05-15 | 珠海格力电器股份有限公司 | Impeller, mixed flow fan and air conditioner |
| CN112182792A (en) * | 2020-08-21 | 2021-01-05 | 西安交通大学 | Universal meridian flow channel design method for diagonal flow/centrifugal impeller |
Non-Patent Citations (1)
| Title |
|---|
| 李超, 张瑞成, 刘振全, 赵荣珍, 田玉恒: "离心通风机叶轮子午面型线的优化设计", 化工机械, no. 02, 25 April 2004 (2004-04-25), pages 78 - 81 * |
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