Impeller, centrifugal fan, hot air assembly and cooking utensil

Abstract

The utility model provides an impeller, centrifugal fan, hot air subassembly and cooking utensil, impeller includes: bottom plate, be equipped with axle hole on the bottom plate, bottom plate along the axial side of axle hole is equipped with reinforcing structure, axle hole passes through reinforcing structure; and the multiple blades are arranged on the side, in the axial direction of the shaft hole, of the bottom plate, the multiple blades are arranged in the circumferential direction of the shaft hole at intervals, and a flow channel is defined between every two adjacent blades. According to the impeller, the reinforcing structure is arranged on the bottom plate and located on the side, in the axial direction of the shaft hole, of the bottom plate, and the shaft hole penetrates through the reinforcing structure, so that the connecting area between the driving shaft and the shaft hole is increased, the connecting strength and reliability between the driving shaft and the impeller are improved, and vibration and noise generated when the impeller works are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and in particular to an impeller, a centrifugal fan, a hot air component and a cooking utensil. Background Art

[0002] At present, centrifugal fans achieve work on air through the rotation of the impeller, thereby achieving the air supply function and increasing the air supply volume. However, when the fan in the related art is working, the drive shaft of the motor drives the impeller to rotate, which will generate vibration, thus causing the impeller to generate certain working noise. Utility Model Content

[0003] The utility model aims to solve the technical problems of large vibration and large noise of the impeller in the prior art.

[0004] To this end, a first aspect of the utility model provides an impeller.

[0005] The second aspect of the utility model also provides a centrifugal fan.

[0006] The third aspect of the utility model also provides a hot air component.

[0007] A fourth aspect of the present invention also provides a cooking utensil.

[0008] In view of this, the first aspect of the utility model proposes an impeller, comprising: a base plate, an axial hole is provided on the base plate, a reinforcing structure is provided on one side of the base plate along the axial direction of the axial hole, and the axial hole passes through the reinforcing structure; a plurality of blades are provided on one side of the base plate along the axial direction of the axial hole, the plurality of blades are arranged at intervals along the circumference of the axial hole, and adjacent blades enclose a flow channel.

[0009] The impeller provided by the utility model includes a base plate and a plurality of blades. The base plate is provided with an axial hole. When the impeller is connected to the motor, the driving shaft of the motor is connected to the impeller through the axial hole, thereby driving the impeller to rotate. The plurality of blades are arranged on one side of the base plate along the axial direction of the axial hole, so that the plurality of blades are fixed, so that a flow channel is enclosed between adjacent blades. When the impeller rotates, the air flow enters from one end of the flow channel and flows out from the other end of the flow channel, thereby realizing the air supply function of the impeller. Among them, a reinforcement structure is provided on the base plate, and the reinforcement structure is located on one side of the base plate along the axial direction of the axial hole, and the axial hole passes through the reinforcement structure, thereby increasing the connection area between the drive shaft and the axial hole, improving the connection strength and reliability between the drive shaft and the impeller, and reducing the vibration and noise of the impeller when it is working.

[0010] The impeller provided by the utility model may also have the following additional technical features:

[0011] In some embodiments, optionally, the reinforcing structure includes a gasket, which protrudes from the bottom plate along the axial direction of the shaft hole.

[0012] In this embodiment, the reinforcement structure includes a gasket, which is arranged on one side of the base plate along the axial direction of the shaft hole and protrudes from the base plate, thereby increasing the axial thickness between the reinforcement structure and the base plate along the shaft hole, increasing the axial length of the shaft hole, and further increasing the connection area between the drive shaft and the shaft hole, thereby improving the connection strength between the drive shaft and the impeller, and improving vibration and noise conditions.

[0013] In some embodiments, the gasket is optionally riveted, welded or bonded to the base plate.

[0014] In this embodiment, the gasket can be connected to the base plate by any connection method of riveting, welding, and bonding, which increases the convenience of gasket installation. Among them, when the gasket is connected to the base plate by riveting, the process is relatively simple and the cost is low. When the gasket is connected to the base plate by welding, the connection strength between the gasket and the base plate is relatively high.

[0015] In some embodiments, optionally, the gasket and the base plate are an integral structure.

[0016] In this embodiment, the gasket and the base plate are an integrated structure, which improves the connection strength between the gasket and the base plate, thereby preventing the gasket from loosening after long-term work.

[0017] Optionally, the gasket and the base plate are integrally formed.

[0018] In some embodiments, optionally, the height of the blade along the axial direction of the shaft hole is h, the diameter of the circle formed by any point on the blade rotating around the axis of the shaft hole is d, and h decreases as d increases.

[0019] In this embodiment, during the work of the blade, the expansion of the flow channel area will cause the overall flow channel to expand rapidly, resulting in a decrease in pressure, and then a small vortex area will appear in the flow channel, causing a backflow phenomenon, affecting the air supply effect. Therefore, the height h of the blade along the axial direction of the shaft hole decreases as the diameter d of the circle formed by any point on the blade rotating around the axis of the shaft hole increases, which can avoid the backflow caused by the increase in the flow channel area and greatly improve the efficiency of the impeller.

[0020] In some embodiments, optionally, along the radial direction of the shaft hole, the diameter of the circle formed by the end of the blade away from the shaft hole rotating around the axis of the shaft hole is D1, and D1, h, and d satisfy the following formula: h=15.56+0.27×(D1-d).

[0021] In this embodiment, along the radial direction of the shaft hole, the diameter of the circle formed by the end of the blade away from the shaft hole rotating around the axis of the shaft hole is D1, and D1, h, and d satisfy the following formula: h=15.56+0.27×(D1-d), so that the height h of the blade changes with the diameter d in a curve, which can avoid the formation of a diffusion channel between two adjacent blades and the appearance of a vortex area in the flow channel between two adjacent blades, thereby reducing the occurrence of backflow and avoiding energy waste due to air flow turbulence, so that the work done by the blade on the airflow can be effectively converted into the kinetic energy of the airflow, thereby further improving the efficiency of the impeller, which is beneficial to increasing the air volume of the fan using the impeller.

[0022] In some embodiments, optionally, along the radial direction of the shaft hole, the diameter of one end of the blade close to the shaft hole is D2, and D2 / D1 is greater than or equal to 0.55 and less than or equal to 0.65.

[0023] In this embodiment, along the radial direction of the axial hole, the ratio of the diameter D2 of the blade end close to the axial hole to the diameter D1 of the blade end away from the axial hole is set to be greater than or equal to 0.55 and less than or equal to 0.65, which can ensure the hub ratio of the blade, thereby improving the driving pressure on the airflow and increasing the working efficiency of the impeller.

[0024] In some embodiments, optionally, the inlet angle of the blade is greater than or equal to 26° and less than or equal to 36°; and / or the outlet angle of the blade is greater than or equal to 53° and less than or equal to 63°; and / or the number of blades is greater than or equal to 10 and less than or equal to 14.

[0025] In this embodiment, the inlet angle of the blade and the outlet angle of the blade affect the efficiency of the impeller. The inlet angle of the blade refers to: in a cross section perpendicular to the axis of the shaft hole, the angle between the tangent of the circle formed by the end of the blade close to the shaft hole around the axis of the shaft hole at the end of the blade close to the shaft hole and the extension direction of the blade. By changing the inlet angle of the blade, the air inlet direction of the airflow entering between two adjacent blades can be changed. Setting the inlet angle of the blade between 26° and 36° can make the airflow enter the flow channel more smoothly, reduce the airflow resistance, avoid airflow turbulence, and thus improve the efficiency of the impeller. The outlet angle of the blade refers to: in a cross section perpendicular to the axis of the shaft hole, the angle between the tangent of the circle formed by the end of the blade away from the shaft hole around the axis of the shaft hole at the end of the blade away from the shaft hole and the extension direction of the blade. By changing the outlet angle of the blade, the air outlet direction of the blade can be changed. Setting the outlet angle of the blade between 53° and 63° can avoid the blade from obstructing the airflow discharge process, making the flow rate of the airflow in the flow channel between two adjacent blades more balanced, avoiding the problem of airflow turbulence caused by different airflow velocities, and preventing energy waste caused by airflow turbulence, which is beneficial to improving the impeller efficiency. In addition, the number of blades determines the cross-section of the flow channel between two adjacent blades. Therefore, the area of ​​the flow channel can be changed by changing the number of blades. Setting the number of blades between 10 and 14 can ensure the area of ​​the flow channel between two adjacent blades, avoid backflow in the flow channel, and thus improve the air outlet effect of the impeller.

[0026] In some embodiments, optionally, the impeller also includes: a cover plate connected to the blade, along the axial direction of the shaft hole, the cover plate and the bottom plate are respectively located on both sides of the blade, the cover plate, the bottom plate and the blade enclose the flow channel, and a through hole is provided on the cover plate, which is arranged opposite to the shaft hole and connected to the flow channel.

[0027] In this embodiment, the impeller further includes a cover plate, and the cover plate and the bottom plate are respectively located on both sides of the blade, thereby improving the fixing effect of the blade. At the same time, adding the cover plate on the side of the blade away from the bottom plate can also separate the air inlet area and the air outlet area, thereby avoiding the backflow between the air inlet area and the air outlet area. On the other hand, it can also form a rectifying effect on the flow channel between the blades, thereby reducing the backflow between the blades and improving the flow efficiency of the airflow.

[0028] In some embodiments, optionally, the blade is connected to the base plate by riveting, welding or bonding; and / or the blade is connected to the cover plate by riveting, welding or bonding.

[0029] In this embodiment, the blades and the bottom plate can be connected by riveting, welding or bonding, and the blades and the cover plate can also be connected by riveting, welding or bonding. Among them, the riveting method is relatively simple to operate, which is conducive to reducing the difficulty of processing; the welding connection method is more firm, which is conducive to improving the stability and strength of the impeller. The bonding connection is more convenient and quick, which improves the assembly efficiency.

[0030] In some embodiments, optionally, the blade and the base plate are an integral structure; and / or the blade and the cover plate are an integral structure.

[0031] In this embodiment, when the blades and the base plate are an integrated structure, the connection strength between the blades and the base plate is improved; when the blades and the cover plate are an integrated structure, the connection strength between the blades and the cover plate is improved, thereby preventing the blades from loosening after the impeller has been working for a long time.

[0032] In some embodiments, optionally, the plurality of blades are arranged to be tilted along the radial direction of the shaft hole, and the tilting direction of the blades is opposite to the rotation direction of the blades.

[0033] In this embodiment, the inclination direction of the blades is opposite to the rotation direction of the impeller, that is, the impeller is a backward impeller. Compared with other impeller forms, the backward impeller has the advantage of high efficiency. The reason is that the air flow velocity at the air outlet of the backward impeller is smaller, and the energy loss in the process of air flow from the air inlet to the air outlet is also smaller. Therefore, the shaft work transmitted by the motor is more converted into the static pressure of the fan. Under the same shaft work, the energy loss of the backward impeller is smaller, and the fan efficiency is higher.

[0034] According to a second aspect of the utility model, a centrifugal fan is also proposed, comprising: an impeller as proposed in any of the above embodiments.

[0035] The centrifugal fan provided in the second aspect of the utility model comprises the impeller proposed in any of the above technical solutions and therefore has all the beneficial effects of the impeller.

[0036] According to a third aspect of the present invention, a hot air component is also proposed, comprising: an impeller or a centrifugal fan as proposed in any of the above embodiments.

[0037] The hot air assembly provided in the third aspect of the utility model comprises the impeller or centrifugal fan proposed in any of the above technical solutions, and therefore has all the beneficial effects of the impeller or centrifugal fan.

[0038] According to a fourth aspect of the present invention, a cooking utensil is also proposed, comprising: an impeller or a centrifugal fan or a hot air component as proposed in any of the above embodiments.

[0039] The cooking utensil provided in the fourth aspect of the present invention comprises the impeller or centrifugal fan or hot air component proposed in any of the above technical solutions, and therefore has all the beneficial effects of the impeller or centrifugal fan or hot air component.

[0040] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 One of the structural schematic diagrams of the impeller of one embodiment of the utility model is shown;

[0043] Figure 2 The second structural schematic diagram of the impeller of one embodiment of the utility model is shown;

[0044] Figure 3 The third structural schematic diagram of the impeller of one embodiment of the utility model is shown;

[0045] Figure 4 A fourth structural schematic diagram of an impeller according to an embodiment of the utility model is shown.

[0046] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0047] 1 bottom plate, 10 shaft hole, 2 blades, 20 flow channel, 3 reinforcement structure, 30 gasket, 4 cover plate, 40 through hole.

[0048] Figure 5 A structural schematic diagram of an impeller in the related art is shown.

[0049] in, Figure 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0050] 1' blade, 2' shaft hole. DETAILED DESCRIPTION

[0051] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0053] Refer to the following Figures 1 to 4 The invention describes an impeller, a centrifugal fan, a hot air assembly and a cooking appliance according to some embodiments of the invention.

[0054] like Figure 1 and Figure 2 As shown, according to an embodiment of the present utility model, the present utility model provides an impeller, comprising: a base plate 1 and a plurality of blades 2.

[0055] Specifically, the bottom plate 1 is provided with an axial hole 10, and a reinforcement structure 3 is provided on one side of the bottom plate 1 along the axial direction of the axial hole 10, and the axial hole 10 passes through the reinforcement structure 3; a plurality of blades 2 are provided on one side of the bottom plate 1 along the axial direction of the axial hole 10, and the plurality of blades 2 are arranged at intervals along the circumferential direction of the axial hole 10, and the flow channel 20 is enclosed between adjacent blades 2, wherein the circumferential direction is Figure 1 The direction of the arrow.

[0056] The impeller provided by the utility model comprises a base plate 1 and a plurality of blades 2. The base plate 1 is provided with an axial hole 10. When the impeller is connected to the motor, the driving shaft of the motor is connected to the impeller through the axial hole 10, thereby driving the impeller to rotate. The plurality of blades 2 are arranged on one side of the base plate 1 along the axial direction of the axial hole 10, so that the plurality of blades 2 are fixed, so that the flow channel 20 is enclosed between adjacent blades 2. When the impeller rotates, the air flow enters from one end of the flow channel 20 and flows out from the other end of the flow channel 20, thereby realizing the air supply function of the impeller. Among them, a reinforcement structure 3 is provided on the base plate 1. The reinforcement structure 3 is located on one side of the base plate 1 along the axial direction of the axial hole 10, and the axial hole 10 passes through the reinforcement structure 3, thereby increasing the connection area between the drive shaft and the axial hole 10, improving the connection strength and reliability between the drive shaft and the impeller, and reducing the vibration and noise of the impeller when it is working.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, optionally, the reinforcing structure 3 includes a gasket 30 , and the gasket 30 protrudes from the bottom plate 1 along the axial direction of the shaft hole 10 .

[0058] In this embodiment, the reinforcing structure 3 includes a gasket 30, which is arranged on one side of the base plate 1 along the axial direction of the shaft hole 10 and protrudes from the base plate 1, thereby increasing the axial thickness between the reinforcing structure 3 and the base plate 1 along the axial direction of the shaft hole 10, increasing the axial length of the shaft hole 10, and further increasing the connection area between the drive shaft and the shaft hole 10, thereby improving the connection strength between the drive shaft and the impeller, and improving vibration and noise conditions.

[0059] It is understandable that the number of the gaskets 30 is one or more, which can be set according to actual conditions.

[0060] In some embodiments, the gasket 30 is optionally riveted, welded or bonded to the base plate 1 .

[0061] In this embodiment, the gasket 30 can be connected to the bottom plate 1 by any connection method of riveting, welding, and bonding, which increases the convenience of installing the gasket 30. Among them, when the gasket 30 is connected to the bottom plate 1 by riveting, the process is relatively simple and the cost is low. When the gasket 30 is connected to the bottom plate 1 by welding, the connection strength between the gasket 30 and the bottom plate 1 is relatively high.

[0062] In some embodiments, optionally, the gasket 30 and the base plate 1 are an integral structure.

[0063] In this embodiment, the gasket 30 and the base plate 1 are an integrated structure, which improves the connection strength between the gasket 30 and the base plate 1, thereby preventing the gasket 30 from loosening after long-term operation.

[0064] Optionally, the gasket 30 and the base plate 1 are formed integrally.

[0065] like Figure 2 and Figure 4 As shown, in some embodiments, optionally, the axial height of the blade 2 along the shaft hole 10 is h, the diameter of the circle formed by any point on the blade 2 rotating around the axis of the shaft hole 10 is d, and h decreases as d increases.

[0066] In this embodiment, during the work of the blade 2, the expansion of the flow channel 20 area will cause the entire flow channel 20 to expand rapidly, resulting in a decrease in pressure, and then a small vortex area will appear in the flow channel 20, resulting in a backflow phenomenon, affecting the air supply effect. Therefore, the height h of the blade 2 along the axial direction of the shaft hole 10 decreases as the diameter d of the circle formed by any point on the blade 2 rotating around the axis of the shaft hole 10 increases, which can avoid the backflow caused by the increase in the flow channel 20 area and greatly improve the efficiency of the impeller.

[0067] It can be understood that as the diameter d increases, the distance between two adjacent blades 2 along the circumferential direction of the impeller gradually increases. Therefore, if the axial height h of the blade 2 remains unchanged, the area of ​​the flow channel 20 will gradually increase, and backflow will occur due to the generation of a vortex area.

[0068] In some embodiments, optionally, along the radial direction of the shaft hole 10, the diameter of the circle formed by the end of the blade 2 away from the shaft hole 10 rotating around the axis of the shaft hole 10 is D1, and D1, h, and d satisfy the following formula: h=15.56+0.27×(D1-d).

[0069] In this embodiment, along the radial direction of the axial hole 10, the diameter of the circle formed by the end of the blade 2 away from the axial hole 10 when it rotates around the axis of the axial hole 10 is D1, and D1, h, and d satisfy the following formula: h=15.56+0.27×(D1-d), so that the height h of the blade 2 changes with the diameter d in a curve, which can avoid the formation of a diffusion channel between two adjacent blades 2 and prevent the appearance of a vortex area in the flow channel 20 between two adjacent blades 2, thereby reducing the occurrence of backflow and avoiding energy waste due to air flow turbulence, so that the work done by the blade 2 on the airflow can be effectively converted into the kinetic energy of the airflow, thereby further improving the efficiency of the impeller, which is beneficial to increasing the air volume of the fan using the impeller.

[0070] like Figure 2 As shown, in some embodiments, optionally, along the radial direction of the shaft hole 10, the diameter of the blade 2 at one end close to the shaft hole 10 is D2, and D2 / D1 is greater than or equal to 0.55 and less than or equal to 0.65.

[0071] In this embodiment, along the radial direction of the axial hole 10, the ratio of the diameter D2 of the end of the blade 2 close to the axial hole 10 to the diameter D1 of the end of the blade 2 away from the axial hole 10 is set to be greater than or equal to 0.55 and less than or equal to 0.65, which can ensure the hub ratio of the blade 2, thereby improving the driving pressure on the airflow and increasing the working efficiency of the impeller.

[0072] Optionally, D2 / D1 (i.e., the ratio of D2 to D1) is equal to any value among 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, and 0.65.

[0073] It can be understood that D2 is the inner diameter of the blade 2 , and D1 is the outer diameter of the blade 2 .

[0074] like Figure 2 and Figure 3 As shown, in some embodiments, optionally, the inlet angle of the blade 2 is greater than or equal to 26° and less than or equal to 36°; and / or the outlet angle of the blade 2 is greater than or equal to 53° and less than or equal to 63°; and / or the number of the blades 2 is greater than or equal to 10 and less than or equal to 14. Figure 3 Where L1 and L2 are both tangent lines.

[0075] In this embodiment, the inlet angle of blade 2 and the outlet angle of blade 2 affect the efficiency of the impeller. Among them, the inlet angle α1 of blade 2 refers to: in a cross section perpendicular to the axis of the shaft hole 10, the angle between the tangent line L1 of the end of blade 2 near the shaft hole 10 and the extension direction of blade 2. By changing the inlet angle α1 of blade 2, the air inlet direction of the airflow entering between two adjacent blades 2 can be changed. Setting the inlet angle α1 of blade 2 between 26° and 36° can make the airflow enter the flow channel 20 more smoothly, reduce the airflow resistance, avoid airflow turbulence, and thus improve the efficiency of the impeller. The outlet angle α2 of blade 2 refers to: in a cross section perpendicular to the axis of the shaft hole 10, the angle between the tangent line L2 of the circle formed by the end of blade 2 away from the shaft hole 10 around the axis of the shaft hole 10 and the extension direction of blade 2. By changing the outlet angle α2 of the blade 2, the air outlet direction of the blade 2 can be changed. Setting the outlet angle α2 of the blade 2 between 53° and 63° can avoid the blade 2 from obstructing the airflow discharge process, making the airflow velocity in the flow channel 20 between two adjacent blades 2 more balanced, avoiding the problem of airflow turbulence caused by different airflow velocities, and preventing energy waste caused by airflow turbulence, which is conducive to improving the impeller efficiency. In addition, the number of blades 2 determines the cross-section of the flow channel 20 between two adjacent blades 2. Therefore, by changing the number of blades 2, the area of ​​the flow channel 20 can be changed. Setting the number of blades 2 between 10 and 14 can ensure the area of ​​the flow channel 20 between two adjacent blades 2, avoid the occurrence of backflow in the flow channel 20, and thus improve the air outlet effect of the impeller.

[0076] Optionally, the inlet angle α1 of the blade 2 is set to any value among 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, and 36°.

[0077] Optionally, the outlet angle α2 of the blade 2 is set to any value among 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, and 63°.

[0078] Optionally, the number of blades 2 is any value among 10, 11, 12, 13, and 14.

[0079] like Figure 1 and Figure 4 As shown, in some embodiments, optionally, the impeller further includes: a cover plate 4, connected to the blade 2, along the axial direction of the shaft hole 10, the cover plate 4 and the bottom plate 1 are respectively located on both sides of the blade 2, the cover plate 4, the bottom plate 1 and the blade 2 enclose the flow channel 20, and a through hole 40 is provided on the cover plate 4, the through hole 40 is arranged opposite to the shaft hole 10 and is connected to the flow channel 20.

[0080] In this embodiment, the impeller further includes a cover plate 4, and the cover plate 4 and the bottom plate 1 are respectively located on both sides of the blade 2, thereby improving the fixing effect of the blade 2. At the same time, adding the cover plate 4 on the side of the blade 2 away from the bottom plate 1 can also separate the air inlet area and the air outlet area, thereby avoiding the backflow between the air inlet area and the air outlet area. On the other hand, it can also form a rectifying effect on the flow channel 20 between the blades 2, thereby reducing the backflow between the blades 2 and improving the flow efficiency of the airflow.

[0081] Optionally, the distance between the cover plate 4 and the base plate 1 along the axis of the shaft hole 10 decreases as d increases.

[0082] In some embodiments, optionally, the blade 2 is connected to the base plate 1 by riveting, welding or bonding; and / or the blade 2 is connected to the cover plate 4 by riveting, welding or bonding.

[0083] In this embodiment, the blade 2 and the bottom plate 1 can be connected by riveting, welding or bonding, and the blade 2 and the cover plate 4 can also be connected by riveting, welding or bonding. Among them, the riveting method is relatively simple to operate, which is conducive to reducing the difficulty of processing; the welding connection method is more firm, which is conducive to improving the stability and strength of the impeller. The bonding connection is more convenient and quick, which improves the assembly efficiency.

[0084] In some embodiments, optionally, the blade 2 and the base plate 1 are an integral structure; and / or the blade 2 and the cover plate 4 are an integral structure.

[0085] In this embodiment, when the blades 2 and the base plate 1 are an integrated structure, the connection strength between the blades 2 and the base plate 1 is improved; when the blades 2 and the cover plate 4 are an integrated structure, the connection strength between the blades 2 and the cover plate 4 is improved, thereby preventing the blades 2 from loosening after the impeller has been working for a long time.

[0086] like Figure 2 As shown, in some embodiments, optionally, a plurality of blades 2 are arranged to be inclined along the radial direction of the shaft hole 10 , and the inclination direction of the blades 2 is opposite to the rotation direction of the blades 2 .

[0087] In this embodiment, the inclination direction of the blade 2 is opposite to the rotation direction of the impeller, that is, the impeller is a backward impeller. Compared with other impeller forms, the backward impeller has the advantage of high efficiency. The reason is that the air flow velocity at the air outlet of the backward impeller is smaller, and the energy loss in the process of air flow from the air inlet to the air outlet is also smaller. Therefore, more of the shaft work transmitted by the motor is converted into the static pressure of the fan. Under the same shaft work, the energy loss of the backward impeller is smaller, and the fan efficiency is higher.

[0088] According to an embodiment of the present invention, a centrifugal fan is also provided, comprising: an impeller as provided in any of the above embodiments.

[0089] The centrifugal fan provided by the utility model comprises the impeller proposed in any of the above embodiments and therefore has all the beneficial effects of the impeller.

[0090] According to an embodiment of the present invention, a hot air component is also proposed, including: an impeller or a centrifugal fan as proposed in any of the above embodiments.

[0091] The hot air component provided by the utility model comprises the impeller or centrifugal fan proposed in any of the above embodiments, and therefore has all the beneficial effects of the impeller or centrifugal fan.

[0092] Optionally, the hot air component also includes a heating tube, which is arranged opposite to the impeller, and the airflow blown out by the impeller can take away the heat of the heating tube.

[0093] According to an embodiment of the present invention, a cooking appliance is also provided, comprising: an impeller or a centrifugal fan or a hot air component as provided in any of the above embodiments.

[0094] The cooking utensil provided by the utility model comprises the impeller or centrifugal fan or hot air component proposed in any of the above embodiments, and therefore has all the beneficial effects of the impeller or centrifugal fan or hot air component.

[0095] Optionally, the cooking appliance includes a cooking cavity, which is provided with an air inlet, and the impeller transports hot air into the cooking cavity through the air inlet to cook the ingredients.

[0096] In specific applications, such as Figure 5 The structure of the impeller in the related art is shown in FIG. 1 , where a plurality of blades 1' are distributed circumferentially around the shaft hole 2', and the blades 1' rotate to perform work on the air. The main problems of the existing impellers are the lack of impeller blade shape design and impeller flow channel design, such as Figure 5 For the impeller shown, after the airflow is sucked in from the air inlet, the flow channel has a relatively weak effect on rectifying the airflow, and the design without a top cover causes the air inlet and outlet of the impeller to be in the same plane, which will produce a large backflow and cause air volume loss, resulting in a decrease in fan efficiency.

[0097] The present application has redesigned the impeller blades 2 and selected a backward impeller form (the direction of the impeller is opposite to the rotation direction of the fan). Compared with other impeller forms, the backward impeller has the advantage of high efficiency. The reason is that the air flow velocity at the outlet of the backward impeller is smaller, and the energy loss in the process of air flow from the air inlet to the air outlet is also smaller. Therefore, more of the shaft work transmitted by the motor is converted into the static pressure of the fan. Under the same shaft work, the energy loss of the backward impeller is smaller, and the fan efficiency is higher. The present application optimizes the inlet and outlet angles (α1, α2) and the hub ratio (D2 / D1) of the blade 2 for the backward impeller, and finally selects the optimal parameter setting. In addition, in the present application, the height of the blade 2 decreases with the increase of the diameter. The purpose of this design is to reduce the diffusion speed of the air flow in the diffusion channel. Figure 1 As shown, the cross-section of the impeller flow channel 20 increases along the diameter direction. During the work of the blade 2, the expansion of the area of ​​the flow channel 20 will cause the flow channel 20 to expand rapidly, resulting in a decrease in pressure, which will cause a small vortex area to appear in the flow channel 20 and generate backflow. This is also a very critical point in the impeller design that affects the efficiency of the impeller. The present application designs a curve of the change in blade 2 height with diameter, which can greatly improve the efficiency of the impeller. In addition, the present application adds an impeller cover (such as the cover plate 4) according to the change in the height of the impeller. On the one hand, it can divide the inlet and outlet air flow channels and reduce the backflow at the inlet and outlet. On the other hand, it can also form a rectifying effect on the inter-blade flow channel (such as the flow channel 20), reduce the inter-blade flow backflow, and improve the flow efficiency of the airflow. And, as Figure 1 As shown, in order to ensure the stability of the impeller under high-speed rotation, the present application adds a reinforcing structure 3 at the position where the impeller and the motor shaft (such as the drive shaft of the motor) are fixed. The purpose of the reinforcing structure 3 is to increase the contact area with the motor drive shaft, thereby reducing the vibration caused by the rotation of the motor, reducing noise, improving reliability, etc. The present application adopts a superimposed gasket 30 and fixes it to the base plate 1 of the impeller by riveting. The operation of this process is simple and the cost is low. In addition, welding, bonding and cast iron integral molding with the base plate 1 can also be used to achieve connection. Finally, the present application optimizes the design of the number n of blades 2 of the impeller. The number of blades 2 determines the cross-section of the flow channel 20 between the blades 2, which will have a great impact on the overall flow. The specific parameters obtained above are also the core technical points that need to be protected in this application. The optimal parameter range is shown in Table 1. Compared within this design range. Figure 5 The fan in the related technology (the prototype impeller in Table 1) can increase the full-pressure efficiency of the fan by 80%. When used with a high-speed motor on a microwave oven, the heating time in the hot air mode is increased by more than 1.5 times year-on-year.

[0098] Among them, the inner and outer diameter ratio of the impeller (D2 / D1)∈[0.55, 0.65].

[0099] The inlet angle α1∈[26°, 36°] of blade 2.

[0100] The outlet angle α2∈[53°, 63°] of blade 2.

[0101] The relationship between the height h and the diameter d of the blade 2 is: h=15.56+0.27×(D1-d).

[0102] The number of blades 2 n∈[10, 14] (rounded).

[0103] Table 1

[0104]

[0105] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0107] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An impeller, characterized in that: include: A bottom plate, wherein an axial hole is provided on the bottom plate, a reinforcing structure is provided on one side of the bottom plate along the axial direction of the axial hole, and the axial hole passes through the reinforcing structure; A plurality of blades are arranged on one side of the bottom plate along the axial direction of the shaft hole. The plurality of blades are arranged at intervals along the circumference of the shaft hole, and adjacent blades enclose a flow channel.

2. The impeller according to claim 1, characterized in that: The reinforcement structure includes a gasket, and the gasket protrudes from the bottom plate along the axial direction of the shaft hole.

3. The impeller according to claim 2, characterized in that: The gasket is riveted, welded or bonded to the base plate.

4. The impeller according to claim 2, characterized in that: The gasket and the bottom plate are an integrated structure.

5. The impeller according to claim 1, characterized in that: The height of the blade along the axial direction of the shaft hole is h, and the diameter of a circle formed by rotating any point on the blade around the axis of the shaft hole is d, and h decreases as d increases.

6. The impeller according to claim 5, characterized in that Along the radial direction of the shaft hole, the diameter of the circle formed by the end of the blade away from the shaft hole rotating around the axis of the shaft hole is D1, and D1, h, and d satisfy the following formula: h = 15.56 + 0.27 × (D1-d).

7. The impeller according to claim 6, characterized in that Along the radial direction of the shaft hole, the diameter of one end of the blade close to the shaft hole is D2, and D2 / D1 is greater than or equal to 0.55 and less than or equal to 0.

65.

8. The impeller according to any one of claims 1 to 7, characterized in that The inlet angle of the blade is greater than or equal to 26° and less than or equal to 36°; and / or The outlet angle of the blade is greater than or equal to 53° and less than or equal to 63°; and / or The number of the blades is greater than or equal to 10 and less than or equal to 14.

9. The impeller according to any one of claims 1 to 7, characterized in that Also includes: A cover plate is connected to the blade. Along the axial direction of the shaft hole, the cover plate and the bottom plate are respectively located on both sides of the blade. The cover plate, the bottom plate and the blade together enclose the flow channel. A through hole is provided on the cover plate. The through hole is arranged opposite to the shaft hole and is connected to the flow channel.

10. The impeller according to claim 9, characterized in that The blades are connected to the base plate by riveting, welding or bonding; and / or The blades are connected to the cover plate by riveting, welding or bonding.

11. The impeller according to claim 9, characterized in that The blades and the base plate are an integrated structure; and / or The blade and the cover plate are an integrated structure.

12. The impeller according to any one of claims 1 to 7, characterized in that The plurality of blades are arranged obliquely along the radial direction of the shaft hole, and the inclination direction of the blades is opposite to the rotation direction of the blades.

13. A centrifugal fan, characterized in that: include: An impeller as claimed in any one of claims 1 to 12.

14. A hot air assembly, characterized in that: include: An impeller as claimed in any one of claims 1 to 12; or The centrifugal fan as claimed in claim 13.

15. A cooking utensil, characterized in that: include: An impeller as claimed in any one of claims 1 to 12; or The centrifugal fan as claimed in claim 13; or The hot air assembly as claimed in claim 14.

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