Impeller, centrifugal fan and air conditioner

Abstract

The utility model relates to the technical field of air conditioners, and discloses an impeller, a centrifugal fan and an air conditioner, the impeller comprises a base plate, a plurality of first blades, a partition plate and second blades, the first blades are arranged on the base plate and distributed at intervals in the circumferential direction of the base plate, the sides, close to the base plate, of the first blades are blade roots, and the partition plate is arranged on the partition plate. One side far away from the chassis is a blade top; the partition plate is annular and connected with the first blades, the inner edge of the partition plate is arranged on the blade top, and the outer edge of the partition plate is located between the blade root and the blade top. The multiple second blades are arranged on the outer side, away from the center of the base plate, of the partition plate, and the multiple second blades are distributed in the circumferential direction of the base plate at intervals. Through cooperation of the partition plate and the second blade, airflow in the blade root area and the blade top area can be isolated, airflow streaming in the blade root area and the blade top area is reduced, the flowing loss of the airflow is reduced, and the work efficiency of the centrifugal fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an impeller, a centrifugal fan and an air conditioner. Background Art

[0002] In the related art, a centrifugal fan is provided in the air conditioner to drive the air flow. The impeller of the centrifugal fan rotates, and the airflow enters the blade channel of the impeller from the air inlet of the centrifugal fan. The airflow changes from axial flow to radial flow. Due to the inertia of the airflow, the flow direction of the airflow between the blade channels has a certain angle with the radial direction, especially in the blade top area, a flow separation zone will be generated, resulting in low overall efficiency of the centrifugal fan and high energy consumption. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an impeller that can improve the flow smoothness of airflow, reduce the flow loss of airflow, and improve the work efficiency of the centrifugal fan.

[0004] The utility model also provides a centrifugal fan with the impeller.

[0005] The utility model also provides an air conditioner with the centrifugal fan.

[0006] The impeller according to the first aspect of the present invention comprises a chassis, a first blade, a partition and a second blade, wherein the first blade is provided in plurality, a plurality of the first blades are provided on the chassis, and the plurality of the first blades are spaced apart along the circumference of the chassis, the side of the first blade close to the chassis is a blade root, and the side away from the chassis is a blade top; the partition is annular and connects a plurality of the first blades, the inner edge of the partition is provided on the blade top, and the outer edge of the partition is located between the blade root and the blade top; the second blade is provided in plurality, a plurality of the second blades are provided on the outer side of the partition away from the center of the chassis, and the plurality of the second blades are spaced apart along the circumference of the chassis.

[0007] The impeller according to the first embodiment of the utility model has at least the following beneficial effects:

[0008] A plurality of first blades are arranged on the chassis at intervals along the circumference of the chassis, a partition connects the plurality of first blades, a plurality of second blades are arranged on the side of the partition away from the chassis, and the plurality of second blades are arranged at intervals along the circumference of the chassis, and the chassis is connected to a driving member, and the chassis can be driven to rotate by the driving member so that the plurality of first blades and the plurality of second blades can move the air, thereby driving the airflow to be sucked in from the center of the chassis along the axial direction of the chassis, and then discharged along the radial direction of the chassis. The partition can isolate the airflow in the blade root area and the blade top area, reduce the cross-flow of the airflow in the blade root area and the blade top area, and reduce the possibility of the blade root area and the blade top area being mixed together, thereby guiding the airflow to flow smoothly and reducing the degree of separation of the airflow. In addition, by arranging the second blades, the airflow in the blade top area can be combed, the flow separation of the airflow in the blade top area can be reduced, the flow loss of the airflow can be reduced, and the work efficiency of the centrifugal fan can be improved.

[0009] According to some embodiments of the present invention, the number of the second blades is at least 50% of the number of the first blades.

[0010] According to some embodiments of the present invention, the number of the second blades is consistent with the number of the first blades, and one second blade is arranged between two adjacent first blades.

[0011] According to some embodiments of the present invention, the maximum distance between the center of the chassis and the first blade is R0, the minimum distance between the center of the chassis and the second blade is R1, and the minimum distance between the center of the chassis and the first blade is R2, satisfying: R2≤R1≤R2+(R0-R2) / 2.

[0012] According to some embodiments of the present invention, along the axial direction of the chassis, the height dimension of the first blade is H, and the height dimension of the second blade is H1, which satisfies:

[0013] According to some embodiments of the present invention, the second blade extends from an inner edge of the partition to an outer edge of the partition.

[0014] According to some embodiments of the present invention, the end of the first blade close to the center of the chassis is the leading edge, the end away from the center of the chassis is the trailing edge, and the outer edge of the partition is arranged at the trailing edge.

[0015] According to some embodiments of the present invention, on the axial section of the chassis, the contour lines on both sides of the partition are arc lines, and the arc lines protrude toward the center of the chassis.

[0016] The centrifugal fan according to the embodiment of the second aspect of the utility model comprises the impeller according to the embodiment of the first aspect of the utility model.

[0017] The centrifugal fan according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: by setting the impeller of the embodiment of the first aspect of the utility model, the airflow in the blade root area and the blade top area can be isolated, the cross-flow of the airflow in the blade root area and the blade top area can be reduced, the flow loss of the airflow is reduced, and the work efficiency of the centrifugal fan is improved.

[0018] The air conditioner according to the embodiment of the third aspect of the utility model comprises the centrifugal fan according to the embodiment of the second aspect of the utility model.

[0019] The air conditioner according to the embodiment of the third aspect of the utility model has at least the following beneficial effects: by setting the centrifugal fan of the embodiment of the second aspect of the utility model, the heat exchange efficiency of the condenser and the evaporator can be improved, the cooling effect of the air conditioner can be enhanced, and the energy efficiency of the air conditioner can be improved.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 A schematic diagram of an impeller according to an embodiment of the first aspect of the utility model;

[0023] Figure 2 yes Figure 1 A local enlarged view of point A;

[0024] Figure 3 A top view of an impeller according to an embodiment of the first aspect of the utility model;

[0025] Figure 4 yes Figure 3 A partial enlarged view of point B;

[0026] Figure 5 A front view of an impeller according to an embodiment of the first aspect of the utility model;

[0027] Figure 6 A test comparison diagram of a centrifugal fan according to an embodiment of the second aspect of the utility model and a centrifugal fan according to the prior art;

[0028] Figure 7 A schematic diagram of an air conditioner according to a third embodiment of the utility model;

[0029] Figure 8 A cross-sectional view of an air conditioner according to a third embodiment of the utility model;

[0030] Fig. 9This is an exploded schematic diagram of an air conditioner according to a third embodiment of the utility model.

[0031] The figures are as follows:

[0032] Chassis 100, bushing 110;

[0033] A first blade 200;

[0034] Partition 300;

[0035] A second blade 400;

[0036] Indoor unit 510 , motor 511 , evaporator 512 , outdoor unit 520 , compressor 521 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] Air conditioners are common household appliances, which are mainly used to adjust the indoor temperature and provide a constant temperature device so that users can get a temperature-appropriate environment. In the related technology, the refrigeration system of the air conditioner usually uses a compression cycle refrigeration method to adjust the temperature of the environment, including a compressor, a condenser, a throttling device and an evaporator. The refrigerant is compressed into a high-temperature and high-pressure gas by the compressor, and then passed into the condenser to release the heat to the outside. At the same time, the refrigerant condenses into a high-pressure liquid, and then the pressure of the refrigerant is reduced by the throttling device to reduce the temperature of the refrigerant, and then passed into the evaporator to absorb the heat in the room, thereby reducing the ambient temperature. Among them, the heat exchange between the condenser and the evaporator is mainly accelerated by the fan to improve the heat exchange efficiency.

[0042] The heat exchange between the existing condenser and evaporator is mainly achieved by accelerating the flow of air through a centrifugal fan to exchange heat. However, when the airflow of the existing centrifugal fan enters the blade channel of the impeller from the air inlet, the airflow changes from axial flow to radial flow. Due to the inertia of the airflow, there is a certain angle between the flow direction of the airflow between the blade channels and the radial direction, which makes it easy for the airflow to produce a flow separation zone in the blade top area, resulting in obstruction of the airflow flow, reducing the working efficiency of the centrifugal fan, thereby affecting the heat exchange efficiency of the condenser and evaporator, and further affecting the cooling effect of the air conditioner, which is not conducive to improving the energy efficiency of the air conditioner.

[0043] The air conditioner may be a cabinet air conditioner, a wall mounted air conditioner, a window air conditioner, or other forms. The following air conditioner is described using a window air conditioner as an example.

[0044] The first embodiment of the utility model proposes an impeller, which isolates the airflow in the blade tip area and the blade root area by setting a partition, reduces the mixing of the airflow in the blade tip area and the blade root area, reduces the possibility of formation of a flow separation zone, allows the airflow to flow smoothly, and improves the work efficiency of the centrifugal fan.

[0045] It is understandable that, referring to Figures 1 to 4The impeller proposed in the embodiment of the first aspect of the utility model includes a chassis 100, a first blade 200, a partition 300 and a second blade 400. A sleeve 110 may be provided at the center of the chassis 100, the axis of the sleeve 110 coincides with the center line of the chassis 100, and the sleeve 110 is used to be installed on the rotating shaft of the driving member; the first blade 200 is provided in plurality, and the plurality of first blades 200 are provided on the chassis 100, and the plurality of first blades 200 are distributed at intervals along the circumference of the chassis 100, the side of the first blade 200 close to the chassis 100 is the blade root, and the side away from the chassis 100 is the blade top; the partition 300 is annular and connects the plurality of first blades 200, the inner edge of the partition 300 is provided at the blade top, and the outer edge of the partition 300 is located between the blade root and the blade top; the second blade 400 is provided in plurality, and the plurality of second blades 400 are provided on the outer side of the partition 300 away from the center of the chassis 100, and the plurality of second blades 400 are distributed at intervals along the circumference of the chassis 100.

[0046] The sleeve 110 is arranged at the center of the chassis 100, and a plurality of first blades 200 are arranged on the chassis 100 at intervals along the circumference of the sleeve 110. The partition 300 connects the plurality of first blades 200, and a plurality of second blades 400 are arranged on the outer side of the partition 300 away from the sleeve 110, and the plurality of second blades 400 are arranged at intervals along the circumference of the sleeve 110. The sleeve 110 can be connected to a driving member, and the chassis 100 can be driven to rotate by the driving member, so that the plurality of first blades 200 and the plurality of second blades 400 can move the air, thereby driving the airflow to be sucked in from the center of the chassis 100 along the axial direction of the sleeve 110, and then discharged along the radial direction of the sleeve 110. The partition 300 can isolate the airflow in the blade root area and the blade top area, reduce the cross-flow of the airflow in the blade root area and the blade top area, and reduce the possibility of the blade root area and the blade top area being mixed together, so that the airflow can be guided to flow smoothly and the degree of separation of the airflow can be reduced. In addition, by providing the second blade 400, the airflow in the blade top area can be combed, the flow separation of the airflow in the blade top area can be reduced, the flow loss of the airflow can be reduced, and the working efficiency of the centrifugal fan can be improved.

[0047] It should be noted that the impeller is driven to rotate by a driving member so that the airflow can be sucked in from the center of the chassis 100 and then discharged radially along the sleeve 110. At this time, the movement direction of the airflow is converted from the axial direction of the sleeve 110 to the radial direction. Due to the movement inertia of the airflow, the airflow quickly slides over the windward surface of the blade, and most of the airflow is located in the blade top area. There is a certain angle between the flow direction of the airflow and the radial direction of the sleeve 110. A flow separation zone is easily formed in the blade top area, resulting in the airflow in the blade top area and the airflow in the blade root area being mixed together, which increases the resistance of the airflow to the radial outflow of the sleeve 110, reduces the work efficiency of the blade tip area, and is not conducive to increasing the air output of the impeller. By setting the inner edge of the partition 300 at the blade top and the outer edge between the blade top and the blade root, the partition 300 can separate the blade top area and the blade root area to reduce the cross-flow of the airflow in the blade top area and the blade root area, reduce the possibility of forming a flow separation area, and reduce the flow resistance of the airflow. In addition, multiple second blades 400 are located on the back side of the partition 300 away from the chassis 100, which can comb the airflow in the blade top area, guide the airflow in the blade top area to be smoothly output, improve the flow smoothness of the airflow, and reduce the flow loss of the airflow.

[0048] The driving member may be an electric motor or a hydraulic motor, and any one of them that can drive the impeller to rotate will not be elaborated here.

[0049] It is understandable that, referring to Figure 3 and Figure 4 , the outlet angle of the blade is the angle between the tangent of the blade outlet edge and the tangent of the point where the outer circle of the impeller intersects, wherein the outlet angle of the first blade 200 is β1, and the outlet angle of the second blade 400 is β2, satisfying: |β1-β2|≤5°. By setting the difference between the outlet angle of the first blade 200 and the outlet angle of the second blade 400 to be less than or equal to 5°, the angle at which the airflow flows out of the first blade 200 and the angle at which the airflow flows out of the second blade 400 are close, so that the airflow can flow in the same direction when it is discharged from the impeller, which facilitates the airflow to converge together, thereby reducing the possibility of the airflow forming a vortex, and improving the separation phenomenon of the airflow during output, reducing the possibility of the airflow accumulating at the outlets of the first blade 200 and the second blade 400, so that the airflow on the first blade 200 and the second blade 400 can be smoothly output, reducing the flow resistance of the gas.

[0050] It is understandable that, referring to Figure 1 and Figure 3, the number of the second blades 400 is at least 50% of the number of the first blades 200. By setting the number of the second blades 400 to be at least 50% of the number of the first blades 200, the second blades 400 can improve the flow separation phenomenon in the blade tip area, comb the flow of the airflow in the blade tip area, make the airflow in the blade tip area flow smoothly, reduce the possibility of the airflow staying on the second blades 400, and reduce the flow loss.

[0051] It should be noted that when the number of second blades 400 is less than the number of first blades 200, the airflow in the blade top separation area can be combed by fewer second blades 400 to reduce the separation of the airflow, and fewer second blades 400 can avoid blocking the blade channel, reduce the friction loss of the airflow on the second blades 400, enable the airflow to flow smoothly in the blade top area, reduce the aerodynamic noise generated by the second blades 400, and improve the working efficiency of the impeller; when the number of second blades 400 is more than the number of first blades 200, a larger number of second blades 400 can increase the airflow pressure of the impeller, reduce the possibility of airflow forming vortices, and enable the airflow to flow smoothly on the surface of the second blades 400, which is beneficial to reducing the expansion angle of the blade channel, reducing the flow loss of the airflow, and improving the working efficiency of the impeller.

[0052] It is understandable that, referring to Figure 1 and Figure 3 , the number of the second blades 400 is consistent with the number of the first blades 200, and one second blade 400 is arranged between two adjacent first blades 200. By setting the number of the first blades 200 and the second blades 400 to be equal, the second blades 400 can increase the centrifugal force on the airflow, thereby increasing the flow rate in the blade tip area, improving the airflow separation phenomenon in the blade tip area, combing the flow of the airflow, so that the airflow can flow smoothly on the surface of the second blade 400, reducing the flow resistance of the airflow in the blade tip area, reducing the possibility of the airflow forming a vortex, reducing the flow loss of the airflow, and the first blade 200 can increase the cross-sectional area of ​​the blade channel, so that the airflow can pass through the blade channel smoothly, avoiding the blockage of the blade channel, reducing the friction loss of the airflow, and conveniently increasing the rotation speed of the impeller, increasing the air output of the impeller, and improving the working efficiency of the impeller.

[0053] Among them, by arranging the second blade 400 between two adjacent first blades 200, the impeller is evenly arranged in the circumferential direction, and the flow rate of the airflow output along the radial direction of the sleeve 110 can be made the same, which facilitates the airflow to be gathered together, reduces the possibility of the airflow forming a vortex at the outlet, and facilitates the smooth output of the airflow in the blade channel, which is beneficial to reducing the flow resistance of the airflow and improving the flow smoothness of the airflow.

[0054] In addition, the second blade 400 is arranged between two adjacent first blades 200 to ensure uniform mass distribution of the impeller in the circumferential direction, thereby enabling the impeller to be subjected to balanced forces during rotation and avoiding stress concentration, which is beneficial to improving the rotational stability of the impeller, reducing the possibility of vibration, and extending the service life of the impeller.

[0055] It is understandable that, referring to Figure 1 and Figure 3 , along the radial direction of the sleeve 110, the maximum distance between the center of the chassis 100 and the first blade 200 is R0, the minimum distance between the center of the chassis 100 and the second blade 400 is R1, and the minimum distance between the center of the chassis 100 and the first blade 200 is R2, satisfying: R2≤R1≤R2+(R0-R2) / 2. The maximum distances between the first blade 200, the second blade 400 and the axis of the sleeve 110 are both R0. By defining R2≤R1≤R2+(R0-R2) / 2, the wind-catching area of ​​the first blade 200 and the second blade 400 can be increased, so that the first blade 200 and the second blade 400 can capture more air, and the output pressure of the airflow can be increased, so that the airflow can be delivered over a longer distance, the possibility of airflow separation is reduced, the possibility of airflow forming turbulence and vortex is reduced, and the smoothness of airflow movement is improved.

[0056] In addition, the first blade 200 and the second blade 400 can allow more air to enter the impeller, increase the output flow of the impeller, and reduce the speed of the airflow entering the impeller, so as to better disperse the airflow, comb the flow of the airflow, reduce the possibility of the airflow forming a vortex, reduce the impact of the airflow, improve the operating stability of the impeller, and extend the service life.

[0057] It is understandable that, referring to Figure 1 and Figure 5 , along the axial direction of the chassis 100 , the height dimension of the first blade 200 is H, and the height dimension of the second blade 400 is H1, satisfying: By definition The position of the second blade 400 is arranged reasonably so that the second blade 400 has sufficient wind catching area, the wind suction capacity of the second blade 400 is enhanced, and the second blade 400 is prevented from weakening the airflow conveying capacity of the first blade 200, so that the first blade 200 can smoothly drive the airflow output, and prevent the second blade 400 from blocking the airflow from being output from the outside of the first blade 200, thereby reducing the flow resistance of the airflow and improving the flow smoothness of the airflow.

[0058] In addition, by setting the height dimension of the second blade 400 to be less than or equal to the height dimension of the first blade 200, the weight of the second blade 400 can be reduced, so that the weight of the impeller can vary less in the axial direction, thereby reducing the bending stress on the output shaft of the drive member and extending the service life of the drive member.

[0059] It is understandable that, referring to Figure 1 and Figure 2 , the second blade 400 extends from the inner edge of the partition 300 to the outer edge of the partition 300. By arranging the second blade 400 to extend from the inner edge of the partition 300 to the outer edge of the partition 300, the airflow driven by the second blade 400 can flow from the side of the partition 300 away from the chassis 100, so as to comb the flow of the airflow in the blade tip area, avoid the mixing of the airflow driven by the second blade 400 and the airflow driven by the first blade 200, thereby reducing the possibility of the airflow forming a vortex, reducing the possibility of the airflow in the blade tip area passing over the partition 300 and the airflow in the blade root area, improving the airflow separation phenomenon in the blade tip area, and reducing the flow loss.

[0060] It is understandable that, referring to Figure 1 and Figure 2 The end of the first blade 200 close to the center of the chassis 100 is the leading edge, the end away from the center of the chassis 100 is the trailing edge, and the outer edge of the partition 300 is arranged at the trailing edge. By arranging the outer edge of the partition 300 at the trailing edge of the first blade 200, the partition 300 can guide the moving direction of the airflow, and prevent the airflow delivered by the first blade 200 from crossing the partition 300 and mixing with the airflow delivered by the second blade 400, thereby reducing the possibility of the airflow forming a vortex, reducing the flow loss of the airflow, allowing the airflow to flow smoothly, and reducing the flow resistance of the airflow.

[0061] It is understandable that, referring to Figure 1 , Figure 2 and Figure 5 On the axial section of the chassis 100, the contour lines on both sides of the partition 300 are arc lines, and the arc lines are raised toward the center of the chassis 100. By setting the contour lines on both sides of the partition 300 as arc lines, the airflow can flow smoothly on the wall surface of the partition 300. The arc surface is conducive to guiding the airflow from the axial direction to the radial direction, reducing the movement impact of the airflow and the partition 300, thereby reducing the movement resistance of the airflow, reducing the possibility of airflow separation, and further reducing the flow loss of the airflow.

[0062] In addition, the contour lines on both sides of the partition 300 are raised toward the sleeve 110, so that the partition 300 can guide the movement direction of the airflow and reduce the flow impact of the airflow on the partition 300, so that the airflow can flow smoothly and reduce the cross-flow between the airflow in the blade root area and the airflow in the blade top area, thereby improving the airflow separation phenomenon in the blade top area and improving the flow smoothness of the airflow.

[0063] It should be noted that the contour lines on both sides of the partition 300 can also be straight lines. By setting the shape of the partition 300 as a flat plate, the flow path of the airflow can be shortened, and the time for the airflow to flow on the partition 300 can be reduced, thereby improving the flow smoothness of the airflow and reducing the separation of the airflow. In addition, the contour lines on both sides of the partition 300 can also be folded lines. By setting the shape of the partition 300 as a folded plate, the flow direction of the airflow can be adjusted to guide the flow of the airflow, reduce the possibility of axial cross-flow of the airflow, reduce the possibility of vortex formation of the airflow, and reduce the flow loss of the airflow.

[0064] It is understandable that, referring to Figure 1 and Figure 6 The centrifugal fan proposed in the embodiment of the second aspect of the utility model has an impeller according to the embodiment of the first aspect of the utility model, the impeller comprising a chassis 100, a first blade 200, a partition 300 and a second blade 400, a shaft sleeve 110 is arranged at the center of the chassis 100; the first blade 200 is arranged in plurality, a plurality of first blades 200 are arranged on the chassis 100, and the plurality of first blades 200 are distributed at intervals along the circumference of the shaft sleeve 110, the side of the first blade 200 close to the chassis 100 is the blade root, and the side away from the chassis 100 is the blade top; the partition 300 is annular and connects the plurality of first blades 200, the inner edge of the partition 300 is arranged at the blade top, and the outer edge of the partition 300 is located between the blade root and the blade top; the second blade 400 is arranged in plurality, a plurality of second blades 400 are arranged on the side of the partition 300 away from the chassis 100, and the plurality of second blades 400 are distributed at intervals along the circumference of the shaft sleeve 110.

[0065] The impeller rotates so that the multiple first blades 200 and the multiple second blades 400 can move the air, thereby driving the airflow to be sucked in from the center of the chassis 100 along the axial direction of the sleeve 110, and then flowing out in a direction away from the sleeve 110. The partition 300 can isolate the airflow in the blade root area and the blade top area, reduce the cross-flow of the airflow in the blade root area and the blade top area, and reduce the possibility of the blade root area and the blade top area mixing together, so as to guide the airflow to flow smoothly and reduce the degree of separation of the airflow. In addition, by setting the second blade 400, the airflow in the blade top area can be combed, the flow separation of the airflow in the blade top area can be reduced, the flow loss of the airflow can be reduced, and the work efficiency of the centrifugal fan can be improved.

[0066] Reference Figure 6, the solid line in the figure corresponds to the centrifugal fan of the prior art, and the dotted line corresponds to the centrifugal fan of the second embodiment of the present embodiment. Compared with the centrifugal fan of the prior art, the centrifugal fan using the impeller of the first embodiment of the utility model can reduce the flow separation of the airflow in the blade tip area, reduce the flow loss of the airflow, and improve the work efficiency of the centrifugal fan. Under the same air volume, the power of the centrifugal fan of the second embodiment of the utility model is lower than that of the centrifugal fan of the prior art, and the greater the air volume, the more obvious the power reduction and the lower the energy consumption, thereby optimizing energy consumption and improving the energy efficiency of the air conditioner.

[0067] It is understandable that, referring to Figures 7 to 9 The air conditioner proposed in the third embodiment of the utility model includes the centrifugal fan of the second embodiment of the utility model.

[0068] The air conditioner may be a cabinet air conditioner, a wall mounted air conditioner, a window air conditioner, or other forms. The following air conditioner is described using a window air conditioner as an example.

[0069] The window air conditioner includes an integrated indoor unit 510 and an outdoor unit 520. The indoor unit 510 includes a motor 511, an impeller, and an evaporator 512. The outdoor unit 520 includes a compressor 521, a condenser, and a throttling component. The compressor 521, the condenser, the throttling component and the evaporator 512 are connected by pipelines. The refrigerant is compressed by the compressor 521 to form a high-temperature and high-pressure gas, which is then passed into the condenser. The heat is then dissipated to the outdoors through the condenser. At the same time, the refrigerant condenses into a high-pressure liquid. The pressure of the refrigerant is then reduced through a throttling device to reduce the temperature of the refrigerant, which is then passed into the evaporator 512 to absorb indoor heat. The centrifugal fan drives the impeller to rotate through the motor 511, thereby driving the airflow through the evaporator 512, increasing the flow rate of the airflow, thereby accelerating the heat exchange of the evaporator 512, enhancing the refrigeration effect, and improving energy efficiency.

[0070] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Impeller, It is characterized in that include: Chassis; A plurality of first blades are arranged on the chassis, the plurality of first blades are spaced apart along the circumference of the chassis, a side of the first blade close to the chassis is a blade root, and a side away from the chassis is a blade tip; a partition plate, the partition plate being annular and connecting a plurality of the first blades, the inner edge of the partition plate being arranged at the blade top, and the outer edge of the partition plate being located between the blade root and the blade top; A plurality of second blades are arranged on the outer side of the partition away from the center of the bottom plate, and the plurality of second blades are distributed at intervals along the circumference of the bottom plate.

2. The impeller according to claim 1, It is characterized in that The number of the second blades is at least 50% of the number of the first blades.

3. The impeller according to claim 2, It is characterized in that The number of the second blades is consistent with the number of the first blades, and one second blade is arranged between two adjacent first blades.

4. The impeller according to claim 1, It is characterized in that The maximum distance between the center of the chassis and the first blade is R 0 , the minimum distance between the center of the chassis and the second blade is R 1 , the minimum distance between the center of the chassis and the first blade is R 2 , satisfying: R 2 ≤R 1 ≤R 2 +(R 0 -R 2 ) / 2.

5. The impeller according to claim 1, It is characterized in that Along the axial direction of the chassis, the height dimension of the first blade is H, and the height dimension of the second blade is H 1 ,satisfy:

6. The impeller according to claim 1, It is characterized in that The second blade extends from an inner edge of the partition to an outer edge of the partition.

7. The impeller according to claim 1, It is characterized in that The end of the first blade close to the center of the chassis is a leading edge, and the end away from the center of the chassis is a trailing edge. The outer edge of the partition is arranged at the trailing edge.

8. The impeller according to claim 1, It is characterized in that On the axial section of the chassis, the contour lines on both sides of the partition are arc lines, and the arc lines protrude toward the center of the chassis.

9. Centrifugal fan, It is characterized in that Comprising an impeller as claimed in any one of claims 1 to 8.

10. Air conditioner, It is characterized in that Comprising the centrifugal fan as claimed in claim 9.

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