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 chassis, a plurality of blades and a guide plate, the plurality of blades are arranged on the chassis, and the plurality of blades are distributed at intervals along the circumferential direction of the chassis; the guide plate is arranged on the windward side of the blade; wherein the flow guide plate is parallel to the base plate, the height direction of the flow guide plate is perpendicular to the windward side of the blade, and the height size of at least part of the flow guide plate is gradually increased or gradually decreased in the direction away from the center of the base plate. The stability of airflow flowing on the windward sides of the blades can be improved through the flow guide plates, the possibility of vortex forming is reduced, the airflow separation degree 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 a wind wheel, 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 path 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 paths has a certain angle with the radial direction, which will produce a flow separation zone. In some areas, due to the high flow velocity, the flow loss is large, 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 provides an impeller that can reduce the generation of vortices, reduce flow losses, 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 using the centrifugal fan.

[0006] The impeller according to the first aspect of the present invention comprises a chassis, blades and a guide plate, wherein the blades are arranged in plurality, the plurality of blades are arranged on the chassis, the plurality of blades are spaced apart along the circumference of the chassis, the end of the blade close to the center of the chassis is the leading edge, and the end away from the center of the chassis is the trailing edge; the guide plate is arranged on the windward surface of the blade; wherein the guide plate is arranged parallel to the chassis, the height direction of the guide plate is perpendicular to the windward surface of the blade, and along the direction away from the center of the chassis, at least part of the height dimension of the guide plate gradually increases or decreases.

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

[0008] A plurality of blades are arranged on the chassis at intervals along the circumference of the chassis, and the chassis is connected to a driving member to drive the rotation, so that the plurality of 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 flowing from the leading edge to the trailing edge of the blade, so that the airflow can flow out from between two adjacent blades. By arranging the guide plate on the windward surface of the blade, and arranging the guide plate and the chassis in parallel, so that the guide plate can separate the blades along the axial direction of the chassis, the stability of the airflow flowing on the windward surface of the blade can be improved, the possibility of vortex formation can be reduced, and the airflow can enter between two adjacent blades evenly. In the direction away from the center of the chassis, at least part of the height dimension of the guide plate gradually increases or decreases, adapting to the change in the flow speed of the airflow, so that when the airflow flows from the leading edge to the trailing edge, the degree of airflow separation is reduced, and the work efficiency of the centrifugal fan is improved.

[0009] According to some embodiments of the utility model, a flow channel is formed between two adjacent blades, and the flow channel gradually expands in a direction away from the center of the chassis, and the height dimension of at least part of the guide plate gradually increases.

[0010] According to some embodiments of the present invention, a flow channel is formed between two adjacent blades, and the flow channel gradually shrinks in a direction away from the center of the chassis, and the height dimension of at least part of the guide plate gradually decreases.

[0011] According to some embodiments of the present invention, the guide plate extends from the leading edge to the trailing edge of the blade.

[0012] According to some embodiments of the present invention, the height of the guide plate gradually decreases or increases in a direction away from the center of the chassis.

[0013] According to some embodiments of the utility model, a plurality of guide plates are provided on the windward surface of the blade.

[0014] According to some embodiments of the present invention, the direction perpendicular to the chassis is the height direction of the blade, and the plurality of guide plates are arranged at equal intervals along the height direction of the blade.

[0015] According to some embodiments of the present invention, the distance between two adjacent guide plates is d, the height of the blade is D, and the

[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 separation of the airflow can be suppressed and the flow loss of the airflow can be reduced, thereby increasing the air volume output by the centrifugal fan and reducing energy consumption.

[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 for Figure 1 A local enlarged view of point A;

[0024] Figure 3 Another schematic diagram of the guide plate of the impeller of the first aspect of the utility model;

[0025] Figure 4 A top view of an impeller according to an embodiment of the first aspect of the utility model;

[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] Blade 200, flow channel 210,

[0034] Guide plate 300,

[0035] Indoor unit 410 , motor 411 , evaporator 412 , outdoor unit 420 , compressor 421 . DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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, the existing centrifugal fan has low working efficiency, high energy consumption, and generates a small amount of air, which affects the heat exchange efficiency of the condenser and evaporator, and further affects the cooling effect of the air conditioner, which is not conducive to improving the energy efficiency of the air conditioner.

[0042] The first embodiment of the utility model proposes an impeller, which, by arranging a guide plate with varying height on the windward side of the blade, can stabilize the airflow movement on the windward side of the blade, reduce the possibility of airflow forming vortices, reduce the flow loss of the airflow, and improve the work efficiency of the centrifugal fan.

[0043] It is understandable that, referring to Figure 1 , Figure 2 and Figure 4 The impeller proposed in the embodiment of the first aspect of the utility model includes a chassis 100, blades 200 and a guide plate 300. A shaft sleeve 110 can be provided at the center of the chassis 100, and the axis of the shaft sleeve 110 coincides with the center line of the chassis 100; the blade 200 is provided in plurality, and the plurality of blades 200 are provided on the chassis 100, and the plurality of blades 200 are distributed at intervals along the circumference of the chassis 100, and the end of the blade 200 close to the center of the chassis 100 is the leading edge, and the end away from the center of the chassis 100 is the trailing edge, and the length direction of the blade 200 is from the leading edge to the trailing edge; the guide plate 300 is provided on the windward surface of the blade 200; wherein the guide plate 300 is arranged parallel to the chassis 100, and the height direction of the guide plate 300 is perpendicular to the windward surface of the blade 200, and along the direction away from the center of the chassis 100, at least part of the height dimension of the guide plate 300 gradually increases or gradually decreases.

[0044] The sleeve 110 is arranged at the center of the chassis 100, and a plurality of blades 200 are arranged on the chassis 100 at intervals along the circumference of the chassis 100. The chassis 100 is connected to the output end of the driving member through the sleeve 110, and the chassis 100 is driven to rotate by the driving member, so that the plurality of blades 200 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 chassis 100, and then flow out in a direction away from the center of the chassis 100. By arranging the guide plate 300 on the windward surface of the blade 200, and the guide plate 300 and the chassis 100 are arranged in parallel, so that the guide plate 300 can space the blade 200 along the axial direction of the sleeve 110, the stability of the airflow flowing on the windward surface of the blade 200 can be improved, and the possibility of the generation of vortices can be reduced. The guide plate 300 guides the airflow to evenly enter the flow channel between two adjacent blades 200, and improves the phenomenon of uneven airflow above and below the blade 200. Along the direction away from the center of the chassis 100, at least part of the height dimension of the guide plate 300 gradually increases or decreases to adapt to the change in the flow velocity of the airflow, so that when the airflow flows from the leading edge to the trailing edge, the separation degree of the airflow is reduced, thereby improving the work efficiency of the centrifugal fan.

[0045] It should be noted that the impeller is driven to rotate by the driving member so that the airflow can flow in from the center of the chassis 100 and then flow out from the leading edge to the trailing edge of the blade 200. 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, in the area where the blade 200 is away from the chassis 100, the flow direction of the airflow from the leading edge to the trailing edge has a large angle with the radial direction of the sleeve 110, so that a flow separation area is generated on the blade 200, and the main airflow is mainly concentrated in the area where the blade 200 is close to the chassis 100, resulting in low work efficiency in the area where the blade 200 is away from the chassis 100, and a high flow velocity and high flow loss in the area where the blade 200 is close to the chassis 100. By arranging the guide plate 300 on the blade 200, so that the guide plate 300 can separate the airflow on the windward surface of the blade 200, the flow separation area can be reduced, the phenomenon of airflow backflow can be reduced, and the possibility of airflow forming vortex can be reduced, so that the airflow can move smoothly and reduce flow loss.

[0046] By setting the height dimension of the guide plate 300 to gradually increase or decrease, the guide plate 300 can specifically adapt to the changes in the speed of the airflow. For example, when the airflow speed increases, the height dimension of the guide plate 300 decreases; when the airflow speed decreases, the height dimension of the guide plate 300 increases. This can improve the guiding effect of the guide plate 300 on the airflow, thereby suppressing the axial cross-flow of the airflow, reducing the possibility of forming vortices, allowing the airflow to flow smoothly from the leading edge to the trailing edge, and reducing the degree of separation of the airflow.

[0047] 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.

[0048] It is understandable that, referring to Figure 1 , Figure 2 and Figure 4 , a flow channel 210 is formed between two adjacent blades 200, and the flow channel 210 gradually expands in the direction away from the center of the chassis 100, and at least part of the height dimension of the guide plate 300 gradually increases. It should be understood here that at least part of the height dimension of the guide plate 300 gradually increases, which means that the height dimension of a part of the guide plate 300 gradually increases, or the height dimension of the entire guide plate 300 gradually increases. By setting the flow channel 210 to gradually increase in the direction away from the center of the chassis 100, so that the cross-sectional area of ​​the flow channel 210 gradually increases along the flow direction, the flow velocity of the airflow can be gradually reduced from the leading edge to the trailing edge. By setting at least part of the height dimension of the guide plate 300 to gradually decrease, so that the height of the guide plate 300 near the trailing edge is greater than the height near the leading edge, the axial cross-flow of the airflow at the position near the trailing edge of the blade 200 can be suppressed, so that the airflow can flow smoothly over the blade 200.

[0049] It should be noted that the height of the guide plate 300 near the leading edge of the blade 200 is set to H1, and the height near the trailing edge of the blade 200 is set to H2. The flow channel 210 gradually expands in the direction away from the center of the chassis 100, so that the flow velocity of the airflow in the flow channel 210 gradually decreases from the leading edge to the trailing edge, so that the airflow separation in the area near the trailing edge of the blade 200 is relatively serious, and the airflow is prone to produce axial cross-flow at the position near the trailing edge of the blade 200, which affects the output efficiency of the airflow. By setting at least part of the height dimension of the guide plate 300 to gradually increase in the direction away from the center of the chassis 100, H1<H2 is satisfied, and the height of the guide plate 300 near the trailing edge of the blade 200 is increased, so that the guide plate 300 can better block the axial movement of the airflow in the area near the trailing edge of the flow channel 210 of the blade 200, thereby better suppressing the axial cross-flow of the airflow, reducing the formation of longitudinal vortices, making the airflow move smoothly, and improving the work efficiency of the part near the trailing edge of the blade 200.

[0050] Among them, the height dimension of part of the guide plate 300 is gradually increased, and the height dimension of the remaining part of the guide plate 300 can remain unchanged, or the height dimension of all the guide plates 300 can be gradually increased, so that the height of the guide plate 300 close to the trailing edge area of ​​the blade 200 is greater than the height close to the leading edge area of ​​the blade 200, thereby reducing the airflow separation in the trailing edge area of ​​the blade 200.

[0051] It is understandable that, referring to Figure 1 , Figure 3 and Figure 4, a flow channel 210 is formed between two adjacent blades 200, and the flow channel 210 gradually decreases in the direction away from the center of the chassis 100, and at least part of the height dimension of the guide plate 300 gradually decreases. It should be understood here that at least part of the height dimension of the guide plate 300 gradually decreases, which means that the height dimension of a part of the guide plate 300 gradually decreases, or the height dimension of the entire guide plate 300 gradually decreases. By setting the flow channel 210 to gradually decrease in the direction away from the center of the chassis 100, so that the cross-sectional area of ​​the flow channel 210 gradually decreases along the flow direction, the speed of the airflow flowing from the leading edge to the trailing edge can be accelerated, and by setting at least part of the height dimension of the guide plate 300 to gradually decrease, so that the height of the guide plate 300 near the leading edge is greater than the height near the trailing edge, so as to adapt to the flow speed of the airflow, the axial cross-flow of the airflow near the leading edge of the blade 200 can be suppressed, so that the airflow can smoothly flow from the leading edge of the blade 200.

[0052] It should be noted that the flow channel 210 gradually narrows in the direction away from the center of the chassis 100, so that the flow speed of the airflow in the flow channel 210 gradually increases from the leading edge to the trailing edge. The flow speed of the flow channel 210 near the leading edge of the blade 200 is less than the flow speed near the trailing edge of the blade 200, and the airflow has to be turned at a larger angle from the leading edge of the blade 200 to the trailing edge of the blade 200, resulting in a serious degree of airflow separation near the leading edge of the blade 200. By setting at least part of the height dimension of the guide plate 300 to gradually increase in the direction close to the center of the chassis 100, H1>H2 is satisfied to increase the height of the guide plate 300 near the leading edge of the blade 200, so that the guide plate 300 can better block the axial movement of the airflow in the area of ​​the flow channel 210 near the leading edge of the blade 200, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, reduce axial cross-flow, reduce the possibility of vortex formation, and improve the workmanship efficiency of the blade 200 near the leading edge.

[0053] Among them, the height dimension of part of the guide plate 300 gradually decreases, and the height of the remaining part of the guide plate 300 can remain unchanged, or the height dimension of all the guide plates 300 can gradually decrease, so that the height of the guide plate 300 close to the leading edge area of ​​the blade 200 is greater than the height close to the trailing edge area of ​​the blade 200, thereby reducing the airflow separation in the leading edge area of ​​the blade 200.

[0054] It is understandable that, referring to Figure 1 and Figure 2The guide plate 300 extends from the leading edge to the trailing edge of the blade 200, so that the guide plate 300 can cover the entire length direction of the blade 200, thereby enhancing the guiding effect of the guide plate 300 on the airflow, preventing the airflow from flowing axially along the shaft sleeve 110 from both ends of the guide plate 300, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, enhancing the effect of suppressing the axial cross-flow of the airflow, and reducing the separation of the airflow.

[0055] Among them, by setting the guide plate 300, the airflow on the windward surface of the blade 200 can flow smoothly, the axial cross-flow of the airflow in the leading edge area of ​​the blade 200 can be reduced, and the flow loss of the airflow in the trailing edge area of ​​the blade 200 can be reduced, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, thereby enhancing the guiding effect on the airflow and improving the flow stability of the airflow.

[0056] It is understandable that, referring to Figures 1 to 3 , the height of the guide plate 300 gradually decreases or increases in the direction away from the center of the chassis 100. By setting the height of the guide plate 300 to gradually decrease or increase, the guide plate 300 can be specifically adapted to the movement direction of the airflow, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, improve the movement stability of the airflow, reduce the formation of vortices, and improve the work efficiency of the blade 200.

[0057] Reference Figure 1 and Figure 2 When the distance between two adjacent blades 200 gradually increases in the direction away from the center of the chassis 100, the speed of the airflow flowing from the leading edge to the trailing edge of the blade 200 gradually decreases, and the height dimension of the guide plate 300 is set to gradually increase in the direction away from the center of the chassis 100, satisfying H1<H2, so that the height of the guide plate 300 close to the trailing edge of the blade 200 is greater than the height of the leading edge of the blade 200, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, reduce the separation of the airflow in the area close to the trailing edge of the blade 200, reduce the possibility of the airflow forming a vortex, and improve the work efficiency of the blade 200.

[0058] Reference Figure 1 and Figure 3When the distance between two adjacent blades 200 gradually decreases in the direction away from the center of the chassis 100, the speed of the airflow flowing from the leading edge to the trailing edge of the blade 200 gradually increases, and the height dimension of the guide plate 300 is set to gradually increase in the direction close to the center of the chassis 100, satisfying H1>H2, so that the height of the guide plate 300 close to the leading edge of the blade 200 is greater than the height of the trailing edge of the blade 200, so that the airflow can flow smoothly from the leading edge to the trailing edge of the blade 200, reducing the separation of the airflow in the area close to the leading edge of the blade 200, and at the same time can reduce the possibility of airflow vortex generated when the airflow turns at the leading edge of the blade 200, thereby improving the work efficiency of the blade 200.

[0059] It is understandable that, referring to Figure 1 and Figure 2 , a plurality of guide plates 300 are provided on the windward surface of the blade 200. By providing a plurality of guide plates 300 arranged at intervals on the windward surface of the blade 200, the plurality of guide plates 300 can separate the blade 200 into a plurality of parts, so that the airflow can flow between two adjacent guide plates 300, increase the resistance of the airflow along the axial movement of the sleeve 110, reduce the possibility of the airflow generating axial cross flow, reduce the possibility of the airflow forming vortex, and improve the work efficiency of the blade 200.

[0060] It should be noted that a plurality of guide plates 300 are arranged at intervals on the windward surface of the blade 200 so that the airflow can flow between two adjacent guide plates 300 and can guide the movement direction of the airflow, reduce the flow distance of the airflow between two adjacent guide plates 300, reduce the possibility of the airflow passing over the guide plates 300, reduce axial cross-flow, and reduce the possibility of the airflow forming a vortex.

[0061] It is understandable that, referring to Figure 1 and Figure 2 , the direction perpendicular to the chassis 100 is the height direction of the blade 200, and the multiple guide plates 300 are arranged at equal intervals along the height direction of the blade 200. By arranging the multiple guide plates 300 at equal intervals along the height direction of the blade 200, the airflow flowing on the windward surface of the blade 200 can be divided into multiple airflows with equal flow rates, so that the airflow can evenly enter between two adjacent blades 200, and the phenomenon of uneven airflow in the height direction of the blade 200 is improved, so that the airflow can be guided to flow evenly from the leading edge to the trailing edge of the blade 200, and the phenomenon of the airflow turning after being output from the trailing edge can be reduced, thereby improving the smoothness of the airflow movement and improving the work efficiency of the blade 200.

[0062] It is understandable that, referring to Figure 1 , Figure 2 and Figure 5, multiple guide plates 300 are arranged at equal intervals along the height direction of the blade 200, the distance between two adjacent guide plates 300 is d, and the height dimension of the blade 200 is D, satisfying By defining the distance between two adjacent guide plates 300 , the influence of the guide plates 300 on the airflow movement is reduced, and the influence of the guide plates 300 on the wind-catching area of ​​the blades 200 is reduced, so that the blades 200 can smoothly drive the airflow movement.

[0063] It should be noted that when When , the distance between two adjacent guide plates 300 is small, which can reduce the flow rate of the airflow between the two adjacent guide plates 300, accelerate the speed of the airflow flowing from the leading edge to the trailing edge, and reduce the movement distance of the airflow along the height direction of the blade 200, weaken the separation phenomenon of the airflow, and improve the smoothness of the movement of the airflow; when When the distance between two adjacent guide plates 300 is large, the flow rate of the airflow between the two adjacent guide plates 300 can be increased, and the blocking effect of the ends of the guide plates 300 on the airflow can be reduced, so that the airflow can smoothly enter between the two adjacent guide plates 300, thereby improving the smoothness of the movement of the airflow.

[0064] In addition, multiple guide plates 300 can also be arranged at unequal intervals along the height direction of the blade 200. Considering that the airflow velocity is higher near the chassis 100, the guide plates 300 can be arranged more densely to increase the guidance of the airflow and reduce cross-flow.

[0065] It is understandable that, referring to Figure 1 The centrifugal fan proposed in the second embodiment of the utility model has an impeller according to the first embodiment of the utility model, the impeller includes a chassis 100, blades 200 and a guide plate 300, a sleeve 110 is arranged at the center of the chassis 100; the blades 200 are arranged in plurality, and the plurality of blades 200 are arranged on the chassis 100, and the plurality of blades 200 are distributed at intervals along the circumference of the sleeve 110, the end of the blade 200 close to the sleeve 110 is the leading edge, and the end away from the sleeve 110 is the trailing edge, and the length direction of the blade 200 is from the leading edge to the trailing edge; the guide plate 300 is arranged on the windward side of the blade 200; wherein the guide plate 300 is arranged parallel to the chassis 100, the height direction of the guide plate 300 is perpendicular to the windward side of the blade 200, and along the length direction of the blade 200, the height dimension of at least part of the guide plate 300 changes continuously.

[0066] The impeller rotates so that the multiple blades 200 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 center of the chassis 100. By arranging the guide plate 300 on the windward surface of the blade 200, and the guide plate 300 and the chassis 100 are arranged in parallel, the guide plate 300 can separate the blade 200 along the axial direction of the sleeve 110, which can improve the stability of the airflow flowing on the windward surface of the blade 200 and reduce the possibility of vortex generation. The guide plate 300 guides the airflow to evenly enter the flow channel between two adjacent blades 200, improving the uneven airflow above and below the blade 200. Along the length direction of the blade 200, at least part of the height dimension of the guide plate 300 is continuously changed, so that when the airflow flows from the leading edge to the trailing edge, the separation degree of the airflow is reduced, and the work efficiency of the centrifugal fan is improved.

[0067] 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 loss and backflow 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 the energy consumption of the air conditioner and improving the energy efficiency of the air conditioner.

[0068] 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.

[0069] 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.

[0070] The window air conditioner includes an integrated indoor unit 410 and an outdoor unit 420. The indoor unit 410 includes a motor 411, an impeller, and an evaporator 412. The outdoor unit 420 includes a compressor 421, a condenser, and a throttling component. The compressor 421, the condenser, the throttling component and the evaporator 412 are connected by pipelines. The refrigerant is compressed by the compressor 421 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 by a throttling device to reduce the temperature of the refrigerant, which is then passed into the evaporator 412 to absorb indoor heat. The centrifugal fan drives the impeller to rotate through the motor 411, thereby driving the airflow through the evaporator 412, increasing the flow rate of the airflow, and thus accelerating the heat exchange of the evaporator 412. There is no need to change the internal structure of the air conditioner, thereby enhancing the refrigeration effect and improving energy efficiency.

[0071] 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. An impeller, characterized in that: include: Chassis; A plurality of blades are arranged on the chassis, and the plurality of blades are distributed at intervals along the circumference of the chassis; A guide plate, arranged on the windward side of the blade; The guide plate is arranged parallel to the chassis, and the height direction of the guide plate is perpendicular to the windward surface of the blade. In the direction away from the center of the chassis, at least part of the height dimension of the guide plate gradually increases or decreases.

2. The impeller according to claim 1, characterized in that: A flow channel is formed between two adjacent blades. The flow channel gradually expands in a direction away from the center of the chassis, and at least a portion of the height dimension of the guide plate gradually increases.

3. The impeller according to claim 1, characterized in that: A flow channel is formed between two adjacent blades, and the flow channel gradually shrinks in a direction away from the center of the chassis, and at least a portion of the height dimension of the guide plate gradually decreases.

4. The impeller according to claim 1, characterized in that: One end of the blade close to the center of the chassis is a leading edge, and one end away from the center of the chassis is a trailing edge. The guide plate extends from the leading edge to the trailing edge of the blade.

5. The impeller according to claim 4, characterized in that: Along the direction away from the center of the chassis, the height dimension of the guide plate gradually decreases or gradually increases.

6. The impeller according to claim 1, characterized in that A plurality of guide plates are arranged on the windward surface of the blade.

7. The impeller according to claim 6, characterized in that The direction perpendicular to the chassis is the height direction of the blade, and the plurality of guide plates are arranged at equal intervals along the height direction of the blade.

8. The impeller according to claim 7, characterized in that The distance between two adjacent guide plates is d, and the height of the blade is D, satisfying 9. A centrifugal fan, characterized in that: Comprising an impeller as claimed in any one of claims 1 to 8.

10. An air conditioner, characterized in that Comprising the centrifugal fan as claimed in claim 9.

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