Centrifugal impellers, compressors and refrigeration equipment

Abstract

The present application relates to a centrifugal impeller, a compressor and a refrigeration device. The centrifugal impeller comprises: a hub; a wheel cover, which is spaced apart from the hub along the axial direction of the centrifugal impeller; a plurality of main blades, which are clamped between the hub and the wheel cover and arranged in pairs along the rotation direction of the centrifugal impeller, and each pair of main blades, the wheel cover and the hub define an air duct together; and at least one splitter blade, each splitter blade is arranged in an air duct, and the air duct is divided into two sub-air ducts arranged in sequence along the rotation direction of the centrifugal impeller, and each splitter blade is provided with a splitter channel connected between the two sub-air ducts. The centrifugal impeller, the compressor and the refrigeration device provided in the present application have a high energy transfer efficiency.

Description

Technical Field

[0001] The present application relates to the field of power technology, and in particular to a centrifugal impeller, a compressor and a refrigeration device. Background Art

[0002] The centrifugal impeller is the heart of the centrifugal compressor, which is used to convert its own mechanical energy into the pressure energy and kinetic energy of the airflow and provide power for the compressor. In the traditional centrifugal impeller, the airflow field formed inside is very complex, often accompanied by boundary layer separation, vortex, jet and many other phenomena, which leads to serious wind loss of the centrifugal impeller and reduced energy transfer efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a centrifugal impeller, a compressor and a refrigeration device with higher energy transfer efficiency to address the problem of reduced energy transfer efficiency.

[0004] A centrifugal impeller, comprising:

[0005] Wheel hub;

[0006] A wheel cover, spaced apart from the wheel hub along the axial direction of the centrifugal impeller;

[0007] a plurality of main fan blades, clamped between the hub and the wheel cover, and arranged in pairs along the rotation direction of the centrifugal impeller, each pair of the main fan blades, the wheel cover and the hub together define an air duct; and

[0008] At least one splitter blade, each of which is arranged in one of the air ducts and divides the air duct into two sub-air ducts arranged in sequence along the rotation direction of the centrifugal impeller, and each of the splitter blades is provided with a splitter channel connected between the two sub-air ducts.

[0009] In one embodiment, there are a plurality of diverter blades, all the air ducts correspond to all the diverter blades one by one, and each diverter blade is arranged in a corresponding air duct.

[0010] In one embodiment, each of the diverter blades includes a first portion and a second portion. In the outflow direction of the airflow in the air duct where each of the diverter blades is located, the first portion and the second portion of each of the diverter blades are spaced apart and define a diverter channel.

[0011] In one embodiment, each pair of the main fan blades includes a downstream main fan blade located downstream in the rotation direction of the centrifugal impeller;

[0012] Each of the first parts is provided with an injection channel, an air inlet of the injection channel is communicated with the corresponding air duct, and an air outlet of the injection channel faces the suction surface of the corresponding downstream main fan blade.

[0013] In one embodiment, the diameter of the air inlet of each injection channel is larger than the diameter of its own air outlet.

[0014] In one embodiment, the wheel cover is provided with a plurality of drainage channels, and all the drainage channels correspond to all the flow splitting blades one by one;

[0015] Each of the first portions includes a first trailing edge, and each of the guide channels is used to guide the airflow at a position where the first trailing edge corresponding thereto is located to an air inlet of the corresponding injection channel.

[0016] In one embodiment, each of the second portions includes an arc-shaped main body segment defining the diversion channel together with the corresponding first portion, and the curvature of the arc-shaped main body segment is greater than the curvature of the first portion.

[0017] In one embodiment, each of the second portions further includes a trailing edge segment which is sequentially arranged and connected to the arc-shaped main body segment along an outflow direction of airflow of the air duct where the second portion is located, and the trailing edge segment extends in a radial direction of the centrifugal impeller.

[0018] In one embodiment, an air inlet connected to each of the air ducts is formed on the wheel cover, and a projection of each of the splitter blades in the plane where the air inlet is located is located outside the air inlet.

[0019] A compressor comprises a centrifugal impeller as described in any one of the above.

[0020] A refrigeration device comprises the above compressor.

[0021] The centrifugal impeller, compressor and refrigeration equipment mentioned above, in each pair of main blades, include an upstream main blade located in the rotation direction of the centrifugal impeller, and a downstream main blade located in the rotation direction of the centrifugal impeller. When the centrifugal impeller is working, the pressure surface of the upstream main blade and the suction surface of the downstream main blade are both arranged toward the air duct, and the air pressure on the pressure surface of the upstream main blade is greater than the air pressure on the suction surface of the downstream main blade. Since a diversion channel is provided on the diversion blade, based on the principle of air pressure balance, the airflow on the pressure surface of the upstream main blade will be blown to the suction surface of the downstream main blade through the diversion channel, resulting in boundary layer loss on the suction surface of the downstream main blade, thereby reducing the wind loss of the boundary layer, thereby having a higher energy transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic diagram of the overall structure of a centrifugal impeller in one embodiment of the present application;

[0023] Figure 2 for Figure 1 The schematic diagram of the overall structure of the centrifugal impeller after removing the wheel cover is shown;

[0024] Figure 3 for Figure 2 A bottom perspective view of a centrifugal impeller is shown;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure of a centrifugal impeller in which each pair of main blades cooperates with one splitter blade;

[0026] Figure 5 for Figure 1 The centrifugal impeller shown is a cross-sectional view taken along a cross section parallel to the split flow pressure surface of the split flow blade after the main blade and the split flow blade are removed;

[0027] Figure 6 for Figure 1 The schematic structural diagram of the first part of the splitter blade in the centrifugal impeller is shown.

[0028] Figure Number:

[0029] 100, centrifugal impeller; 10, wheel hub; 12, inner bottom surface; 20, wheel cover; 22, inner top surface; 24, drainage channel; 241, drainage section; 243, air collection section; 26, air inlet; 30, main fan blade; 31, upstream main fan blade; 312, upstream suction surface; 314, upstream pressure surface; 33, downstream main fan blade; 332, downstream suction surface; 334, downstream pressure surface; 40, split fan blade; 41, split suction Force surface; 42, diverter pressure surface; 43, first part; 432, injection channel; 4321, air inlet section; 4323, air outlet section; 434, first leading edge; 436, first trailing edge; 437, first end face; 438, second end face; 44, second part; 441, arc-shaped main body section; 443, trailing edge section; 45, diverter channel; 50, air duct; 52, upstream sub-air duct; 54, downstream sub-air duct; 60, nozzle. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] See also Figure 1 The present application provides a compressor, which includes a motor and a centrifugal impeller 100. The motor is transmission-connected to the centrifugal impeller 100. The motor is used to drive the centrifugal impeller 100 to rotate, so that the centrifugal impeller 100 can convert its own mechanical energy into pressure energy and kinetic energy of the airflow and provide power for the compressor.

[0037] Please also read Figure 2 , Figure 3 and Figure 4 The centrifugal impeller 100 includes a hub 10, a wheel cover 20, a plurality of main blades 30 and at least one diverter blade 40. The hub 10 and the wheel cover 20 cooperate to support all the main blades 30 and all the diverter blades 40. All the main blades 30 and all the diverter blades 40 are used to guide the flow of air and compress the air. Specifically, the wheel cover 20 and the hub 10 are spaced apart along the axial direction of the centrifugal impeller 100, and all the main blades 30 and all the diverter blades 40 are clamped between the hub 10 and the wheel cover 20. All the main blades 30 are arranged along the rotation direction of the centrifugal impeller 100 (such as Figure 2 The centrifugal impeller 100 and the centrifugal impeller 100 are arranged in pairs (indicated by the arc arrow a), and each pair of main blades 30, the wheel cover 20 and the wheel hub 10 define an air duct 50 together. Each splitter blade 40 is arranged in an air duct 50, and divides the air duct 50 into two sub-air ducts arranged in sequence along the rotation direction of the centrifugal impeller 100, and each splitter blade 40 is provided with a splitter channel 45 connected between the two sub-air ducts.

[0038] Specifically, the rotation direction of the centrifugal impeller 100 coincides with the circumference of the centrifugal impeller 100. Any two adjacent main blades 30 arranged along the rotation direction of the centrifugal impeller 100 form a pair of main blades 30. Taking the number of main blades 30 as three, namely the first main blade, the second main blade and the third main blade, the first main blade, the second main blade and the third main blade arranged in sequence along the rotation direction as an example, the first main blade 30 is spaced apart from the second main blade 30 to form a pair of main blades 30, the second main blade 30 is spaced apart from the third main blade 30 to form a pair of main blades 30, and the third main blade 30 is spaced apart from the first main blade 30 to form a pair of main blades 30.

[0039] Please also read Figure 4In addition, each pair of main blades 30 also has an upstream main blade 31 and a downstream main blade 33 which are arranged in sequence and at intervals along the rotation direction of the centrifugal impeller 100. The upstream main blade 31 and the downstream main blade 33 both extend along the radial direction of the centrifugal impeller 100 to the outer peripheral surface of the wheel cover 20 and the wheel hub 10. The upstream main blade 31 and the downstream main blade 33 both have a suction surface and a pressure surface which are arranged oppositely along the rotation direction of the centrifugal impeller 100.

[0040] In each pair of main wind blades 30, the upstream main wind blade 31 of the pair is also the downstream main wind blade 33 in the previous pair of main wind blades 30, and the downstream main wind blade 33 of the pair is also the upstream main wind blade 31 in the next pair of main wind blades 30. The suction surface of the upstream main wind blade 31 is defined as the upstream suction surface 312, the pressure surface of the upstream main wind blade 31 is defined as the upstream pressure surface 314, the suction surface of the downstream main wind blade 33 is defined as the downstream suction surface 332, and the pressure surface of the downstream main wind blade 33 is defined as the downstream pressure surface 334. In each pair of main wind blades 30, the upstream suction surface 312 of the upstream main wind blade 31 is also the downstream suction surface 332 of the downstream main wind blade 33 in the previous pair of main wind blades 30, and the upstream pressure surface 314 of the upstream main wind blade 31 is also the downstream pressure surface 334 of the downstream main wind blade 33 in the previous pair of main wind blades 30. In each pair of main wind blades 30 , the downstream suction surface 332 of the downstream main wind blade 33 is also the upstream suction surface 312 of the upstream main wind blade 31 in the next pair of main wind blades 30 , and the downstream pressure surface 334 of the downstream main wind blade 33 is also the upstream pressure surface 314 of the upstream main wind blade 31 in the next pair of main wind blades 30 .

[0041] Please also read Figure 5 The wheel cover 20 and the wheel hub 10 respectively have an inner top surface 22 and an inner bottom surface 12 that are opposite and facing each other. The upstream pressure surface 314 and the downstream suction surface 332 in each pair of main wind blades 30, together with the inner top surface 22 and the inner bottom surface 12, form an air duct 50, and the end surface of the upstream main wind blade 31 away from the central axis of the centrifugal impeller 100, the end surface of the downstream main wind blade 33 away from the central axis of the centrifugal impeller 100, the outer peripheral surface of the wheel hub 10, and the outer peripheral surface of the wheel cover 20 together define the air outlet of the air duct 50. The wheel cover 20 is also provided with an air inlet 26 that is connected to the air inlet of each air duct 50. When the centrifugal impeller 100 is working, the external air flow flows into each air duct 50 from the air inlet 26, and flows out to the outside from the air outlet of each air duct 50 after passing through each air duct 50 roughly along the radial direction of the centrifugal impeller 100 (such as Figure 5 The arrow efgh points to, or Figure 5 (indicated by the arrow jkm in the middle).

[0042] Please refer again Figure 3 and Figure 4, wherein each diverter blade 40 is arranged in an air duct 50, and the air duct 50 is divided into two sub-air ducts, and the two sub-air ducts are arranged in sequence along the rotation direction of the centrifugal impeller 100 and respectively form an upstream sub-air duct 52 and a downstream sub-air duct 54. Specifically, each diverter blade 40 also has a suction surface and a pressure surface arranged in sequence along the rotation direction of the centrifugal impeller 100. The suction surface of each diverter blade 40 is defined as a diverter suction surface 41, and the pressure surface of each diverter blade 40 is defined as a diverter pressure surface 42. The upstream pressure surface 314, the diverter suction surface 41, the inner top surface 22 and the inner bottom surface 12 are surrounded to form the upstream sub-air duct 52, and the diverter pressure surface 42, the downstream suction surface 332, the inner top surface 22 and the inner bottom surface 12 are surrounded to form the downstream sub-air duct 54. The diverter channel 45 is connected between the upstream sub-air duct 52 and the downstream sub-air duct 54. In addition, each splitter blade 40 also has a first end face 437 and a second end face 438 which are arranged opposite to each other along the axial direction of the centrifugal impeller 100, and the first end face 437 and the second end face 438 are arranged adjacent to the upstream pressure surface 314 and the splitter suction surface 41. When each splitter blade 40 is arranged in an air duct 50, the first end face 437 is in contact with the inner top surface 22 of the wheel cover, and the second end face 438 is in contact with the inner bottom surface 12 of the hub 10.

[0043] When the centrifugal impeller 100 is working, the upstream pressure surface 314, the split flow pressure surface 42 and the downstream pressure surface 334 are all used to compress the air. Therefore, the air pressure of the upstream pressure surface 314 is greater than the air pressure of the upstream suction surface 312, the air pressure of the split flow pressure surface 42 is greater than the air pressure of the split flow suction surface 41, and the air pressure of the downstream pressure surface 334 is greater than the air pressure of the downstream suction surface 332.

[0044] In the conventional centrifugal impeller 100, the existence of the boundary layer causes a large wind loss. The boundary layer refers to a thin layer of airflow that is close to the surface of an object (e.g., the surface of the main fan blade 30, the surface of the diverter fan blade 40, the surface of the hub 10, the surface of the wheel cover 20, etc.). In the boundary layer, due to the effect of molecular gravity, the airflow is completely attached to the surface of the object, and the relative velocity with the object is zero. Therefore, the airflow at the boundary layer cannot be effectively output by the centrifugal impeller 100, and the airflow velocity at the boundary layer is smaller than the airflow velocity at other positions inside the centrifugal impeller 100, resulting in increased wind loss and reduced energy transfer efficiency. In addition, the larger the surface area of ​​the fan blade in the centrifugal impeller 100, the larger the area of ​​the boundary layer formed. Based on the positive correlation between the area of ​​the boundary layer and the surface area of ​​the fan blade, if the number of fan blades is directly reduced to reduce the total area of ​​the fan blades, although the formation of the boundary layer can be reduced, it will cause the space defined by the hub 10 and the wheel cover 20 of the centrifugal impeller 100 to be relatively hollow. In this way, the airflow between the hub 10 and the wheel cover 20 is likely to form eddies and vortices between the hub 10 and the wheel cover 20, which will also lead to increased wind loss. It can be seen that how to reduce the boundary layer without reducing the number of blades has become a problem to be solved urgently.

[0045] Returning to the present application, all the main wind blades 30 and all the diverter wind blades 40 are combined to form the wind blades of the entire centrifugal impeller 100, and the number of wind blades in the present application is roughly the same as or equal to the number of wind blades in the prior art to prevent the space between the hub 10 and the wheel cover 20 from being too hollow and causing the formation of vortices and vortices. When the centrifugal impeller 100 is working, based on the principle of air pressure balance, in a pair of main wind blades 30 provided with diverter wind blades 40, the airflow on the upstream pressure surface 314 will pass through the upstream sub-air duct 52 to flow to the diverter suction surface 41 at high speed, and impact the boundary layer at the diverter suction surface 41, resulting in boundary layer loss at the diverter suction surface 41. Furthermore, due to the provision of the diverter channel 45, the airflow flowing into the diverter suction surface 41 can also flow into the downstream sub-air duct 54 through the diverter channel 45 (such as Figure 4 The airflow flows in the direction indicated by the straight arrow d in the middle of the centrifugal impeller 100, and impacts the boundary layer at the split flow pressure surface 42. Moreover, the airflow can also flow to the downstream suction surface 332 through the downstream sub-air duct 54 to impact the boundary layer at the downstream suction surface 332. Therefore, in summary, the boundary layer at the split flow suction surface 41, the boundary layer at the split flow pressure surface 42, and the boundary layer at the downstream suction surface 332 all suffer losses. The more the boundary layer is lost, the smaller the wind loss of the boundary layer in the entire centrifugal impeller 100, and the airflow of the lost boundary layer can be output and do work, thereby helping to improve the energy transfer efficiency of the centrifugal impeller 100.

[0046] It is worth mentioning that in the present application, the function of the diverter blade 40 is not only to guide the airflow on the upstream pressure surface 314 to flow into the downstream sub-duct 54 through the upstream sub-duct 52, but it can also have the same function of compressing the airflow and doing work on the airflow as the main blade 30.

[0047] Preferably, there are multiple diverter blades 40, and all the air ducts 50 correspond to all the diverter blades 40 one by one, and each diverter blade 40 is arranged in a corresponding air duct 50. That is to say, a diverter blade 40 is arranged between each pair of main blades 30. Therefore, the boundary layer of the diverter suction surface 41 of each diverter blade 40, the diverter pressure surface 42 of each diverter blade 40, and the downstream suction surface 332 of each pair of main blades 30 can all be lost during the operation of the centrifugal impeller 100, thereby helping to further improve the energy transfer efficiency of the centrifugal impeller 100. It is worth mentioning that the more the number of diverter blades 40, the more the number of main blades 30 should be adaptively reduced, so that the total number of main blades 30 and diverter blades 40 remains unchanged.

[0048] Of course, in some other embodiments, due to the provision of the diversion channel 45 on the diversion blade 40, the centrifugal impeller 100 has a higher energy transfer efficiency, so the sum of the main blades 30 and the diversion blades 40 can also be adaptively increased.

[0049] Furthermore, each splitter blade 40 includes a first portion 43 and a second portion 44. The airflow outflow direction (eg, Figure 4 In the embodiment of the present invention, the first portion 43 and the second portion 44 of each diverter blade 40 are arranged at intervals and define a diverter channel 45 (indicated by arrow b or arrow c). That is to say, in each diverter blade 40, the first portion 43 is located upstream of the second portion 44, and the first portion 43 and the second portion 44 define a diverter channel 45. Compared with the method of directly opening a diverter channel 45 on each diverter blade 40, separating the diverter blade 40 into two disconnected first portions 43 and second portions 44 can reduce the difficulty of forming the diverter channel 45. In addition, under this arrangement, the diverter channel 45 can extend to both ends of the diverter blade 40 along the height direction of the diverter blade 40 (i.e., the axial direction of the centrifugal impeller 100). Therefore, the size of the diverter channel 45 is larger, so that the resistance to the passage of airflow is smaller, so it helps to further improve the energy transfer efficiency of the centrifugal impeller 100.

[0050] Please also read Figure 6 Furthermore, each first portion 43 is provided with an injection channel 432, the air inlet of the injection channel 432 is connected to the corresponding air duct 50, and the air outlet of the injection channel 432 faces the suction surface of the corresponding downstream main wind blade 33. Specifically, the air inlet of the injection channel 432 can be connected to the upstream sub-air duct 52 or the downstream sub-air duct 54 in the air duct 50 where the injection channel 432 is located, and it is only necessary to ensure that the airflow in the air duct 50 where the injection channel 432 is located can flow in from the air inlet of the injection channel 432 and be sprayed to the suction surface of the downstream main wind blade 33 through the air outlet of the injection channel 432. It can be understood that by setting the air outlet of the injection channel 432 to face the suction surface of the corresponding downstream main wind blade 33, it can be ensured that boundary layer loss can occur at the suction surface of the downstream main wind blade 33, and the degree of loss is greater, thereby helping to further improve the energy transfer efficiency of the centrifugal impeller 100.

[0051] Furthermore, the diameter of the air inlet of each injection channel 432 is larger than the diameter of its own air outlet. Under the premise of unchanged flow rate, the smaller the diameter of the fluid passing through, the greater the flow rate. Since the diameter of the air inlet of the injection channel 432 is larger than the diameter of its own air outlet, the flow rate of the airflow flowing into the air inlet of the injection channel 432 is less than the flow rate of the airflow flowing out of the air outlet of the injection channel 432. In other words, the airflow can be accelerated through the air outlet of the injection channel 432 and then sprayed onto the suction surface of the downstream main wind blade 33. In this way, the airflow has a greater impact on the boundary layer, which helps to increase the loss of the boundary layer, so that the centrifugal impeller 100 has a higher energy transfer efficiency.

[0052] Preferably, each injection channel 432 has an air inlet section 4321 and an air outlet section 4323, the air inlet of the air inlet section 4321 is connected to the air duct 50, the air outlet of the air outlet section 4323 faces the suction surface of the downstream main fan blade 33, and the diameter of the air inlet section 4321 is larger than the diameter of the air outlet section 4323. Therefore, the airflow can be accelerated by the air outlet section 4323 and then sprayed to the suction surface of the downstream main fan blade 33. Generally, the air outlet section 4323 has a certain length, and the airflow accelerated by the air outlet section 4323 has a higher flow rate. In this way, the impact of the airflow on the boundary layer can be further increased.

[0053] In some embodiments, the air outlet section 4323 may be one section, and in some other embodiments, the air outlet section 4323 may be multiple sections, and all of the air outlet sections 4323 are connected to the air inlet section 4321. Therefore, the airflow in the air inlet section 4321 is split and flows out through each air outlet section 4323. Specifically, the air outlets of different air outlet sections 4323 correspond to different positions on the suction surface of the downstream main wind blade 33. By providing multiple air outlet sections 4323, the injection channel 432 can blow air to different positions of the suction surface of the downstream main wind blade 33, thereby improving the loss of the boundary layer at the suction surface of the downstream main wind blade 33.

[0054] Preferably, in the same splitter blade, the number of the air outlet segments 4323 of the injection channel 432 is between 4 and 8. Too many air outlet segments 4323 of the injection channel 432 will affect the strength of the first portion 43.

[0055] In some other embodiments, to ensure the spraying effect, a nozzle 60 may be further provided at the air outlet of each air outlet section 4323. The number of nozzles 60 is the same as the number of air outlet sections 4323 and corresponds one to one. To facilitate the provision of the spray channel 432 in the first portion 43, the thickness of the first portion 43 should be relatively thick.

[0056] Please refer again to 4 and Figure 5 In some embodiments, a plurality of drainage channels 24 are provided on the wheel cover 20, and all the drainage channels 24 correspond to all the diverter blades 40. Each first portion 43 includes a first leading edge 434 and a first trailing edge 436 which are sequentially arranged and connected along the outflow direction of the airflow in the air duct 50 where it is located. The first leading edge 434 is arranged close to the central axis of the centrifugal impeller 100, and the first trailing edge 436 and the corresponding second portion 44 define a diverter channel 45. Each drainage channel 24 is used to guide the airflow at the position where the corresponding first trailing edge 436 is located to the air inlet of the corresponding injection channel 432.

[0057] It can be understood that in each air duct 50, the outflow direction of the airflow is roughly the same as the radial direction of the centrifugal impeller 100. And in the process of airflow outflow, due to the action of centrifugal force, the farther the distance from the central axis of the centrifugal impeller 100, the faster the flow rate of the airflow. In other words, the flow rate of the airflow at the position where the first leading edge 434 is located is less than the flow rate of the airflow at the position where the first trailing edge 436 is located. Therefore, each diversion channel 24 introduces the airflow at the position where the corresponding first trailing edge 436 is located into the corresponding injection channel 432, and the flow rate of the airflow ejected from the injection channel 432 is greater, thereby effectively increasing the loss of the boundary layer on the downstream main wind blade 33.

[0058] Of course, in some other embodiments, each guide channel 24 may also be provided on the wheel cover 20, and is used to guide the airflow at the position where the corresponding first leading edge 434 is located to the air inlet of the corresponding injection channel 432. Alternatively, in some other embodiments, each guide channel 24 may also be directly provided on the corresponding splitter blade 40, and guide the airflow at the position where the corresponding first leading edge 434 or first trailing edge 436 is located to the air inlet of the corresponding injection channel 432.

[0059] Preferably, each drainage channel 24 further includes a drainage section 241 and an air collecting section 243. The air collecting section 243 of each drainage channel 24 is connected between the corresponding drainage section 241 and the injection channel 432. Each drainage section 241 is used to introduce the airflow in the corresponding air duct 50 into the air collecting section 243 (such as Figure 5 The air collecting section 243 is used to collect air, so that the airflow can be concentrated in the air collecting section 243 to have a relatively high pressure and then flow to the injection channel 432. The airflow with a relatively high pressure also has a relatively high wind pressure when it flows out of the injection channel 432, and the impact on the downstream main wind blade 33 is also more intense, so that the boundary layer is more easily depleted.

[0060] It is worth mentioning that, in order to ensure that only a small amount of air flows into the guide section 241 in each air duct 50, the diameter of the guide channel 24 can be set to be smaller (by increasing the resistance of the air flow to reduce the inflow of air). In order to reduce the resistance of the air flow flowing from the air collection section 243 to the injection channel 432, the diameter of the air collection section 243 and the air inlet section 4321 can be set to be consistent.

[0061] In some embodiments, each second portion 44 includes an arc-shaped main section 441 and a trailing edge section 443 which are sequentially arranged and connected along the outflow direction of the airflow in the air duct 50 where it is located, and the arc-shaped main section 441 and the first section 43 corresponding to the second portion 44 define a diversion channel 45, and the curvature of the arc-shaped main section 441 is greater than the curvature of the first section 43, and the trailing edge section 443 extends along the radial direction of the centrifugal impeller 100. Specifically, the airflow is subject to less resistance during the flow under the guidance of the fan blade with a slightly larger curvature. Since the arc-shaped main section 441 is farther away from the central axis of the centrifugal impeller 100 than the first section 43, under the action of centrifugal force, the flow velocity of the airflow at the position where the arc-shaped main section 441 is located is greater than the flow velocity of the airflow at the position where the first section 43 is located. By setting the curvature of the arc-shaped main section 441 to be greater than the curvature of the first section 43, it is helpful for the airflow in the air duct 50 to be discharged radially along the centrifugal impeller 100.

[0062] By providing the trailing edge section 443 and extending along the radial direction of the centrifugal impeller 100, when the airflow flows into the position in contact with the trailing edge section 443, it can flow out along the radial direction of the centrifugal impeller 100 under the guidance of the trailing edge section 443. According to the principle of the shortest straight line between two points, since the trailing edge section 443 extends along the radial direction of the centrifugal impeller 100, the airflow has the shortest outflow path, so the loss of the airflow during the flow process is also minimal, and the work capacity flowing out to the outside is stronger, and the energy transfer efficiency is also higher.

[0063] Specifically, the second portion 44 is mainly responsible for the function of doing work. If the trailing edge section 443 of the second portion 44 is too thick, it is more likely to cause wake loss. Therefore, it should be as thin as possible. The thickness of the trailing edge section 443 can be set to be less than or equal to 3 mm.

[0064] In some embodiments, the projection of each splitter blade 40 in the plane where the air inlet 26 is located is located outside the air inlet 26. Therefore, the area of ​​the air inlet 26 blocked by the splitter blade 40 is also small to prevent the air inlet 26 from being blocked, so that the external airflow can flow into each air duct 50 more smoothly.

[0065] Preferably, in the radial direction of the centrifugal impeller 100 , each splitter blade 40 is spaced apart from the boundary line of the air inlet 26 , and the distance between each splitter blade 40 and the boundary line of the air inlet 26 is within a range of 20% to 30% of the total arc length of any main blade 30 .

[0066] The centrifugal impeller 100, the compressor and the refrigeration equipment, in each pair of main blades 30, include an upstream main blade 31 located in the rotation direction of the centrifugal impeller 100, and a downstream main blade 33 located in the rotation direction of the centrifugal impeller 100. When the centrifugal impeller 100 is working, the pressure surface of the upstream main blade 31 and the suction surface of the downstream main blade 33 are both arranged toward the air duct 50, and the air pressure on the pressure surface of the upstream main blade 31 is greater than the air pressure on the suction surface of the downstream main blade 33. Since the splitter blade 40 is provided with a splitter channel 45, based on the principle of air pressure balance, the airflow on the pressure surface of the upstream main blade 31 will be blown to the suction surface of the downstream main blade 33 through the splitter channel 45, resulting in boundary layer loss on the suction surface of the downstream main blade 33, thereby reducing the wind loss of the boundary layer, thereby having a higher energy transfer efficiency.

[0067] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A centrifugal impeller (100), characterized in that: The centrifugal impeller (100) comprises: Wheel hub (10); A wheel cover (20) is arranged spaced apart from the wheel hub (10) along the axial direction of the centrifugal impeller (100); A plurality of main fan blades (30) are clamped between the wheel hub (10) and the wheel cover (20) and arranged along the rotation direction of the centrifugal impeller (100); adjacent main fan blades (30), the wheel cover (20) and the wheel hub (10) jointly define an air duct (50); and the wheel cover (20) is provided with an air inlet (26) that is in communication with each of the air ducts (50); and a plurality of split air blades (40), all the air ducts (50) corresponding to all the split air blades (40) one by one, each of the split air blades (40) being arranged in one of the air ducts (50) corresponding thereto, and the air duct (50) being divided into two sub-air ducts arranged in sequence along the rotation direction of the centrifugal impeller (100), and the projection of each of the split air blades (40) in the plane where the air inlet (26) is located is located outside the air inlet (26); Each of the flow splitting blades (40) comprises a first portion (43) and a second portion (44); in the outflow direction of the airflow in the air duct (50) where each of the flow splitting blades (40) is located, the first portion (43) and the second portion (44) of each of the flow splitting blades (40) are arranged at intervals and define a flow splitting channel (45); The adjacent main fan blades (30) include a downstream main fan blade (33) located downstream in the rotation direction of the centrifugal impeller (100); each of the first parts (43) is provided with an injection channel (432), the air inlet of the injection channel (432) is connected to the corresponding air duct (50), and the air outlet of the injection channel (432) faces the suction surface of the corresponding downstream main fan blade (33).

2. The centrifugal impeller (100) according to claim 1, characterized in that: The diameter of the air inlet of each injection channel (432) is larger than the diameter of its own air outlet.

3. The centrifugal impeller (100) according to claim 1, characterized in that: Each of the injection channels (432) has an air inlet section (4321) and an air outlet section (4323), the air inlet of the air inlet section (4321) being connected to the air duct (50), the air outlet of the air outlet section (4323) facing the suction surface of the downstream main fan blade (33), and the diameter of the air inlet section (4321) being greater than the diameter of the air outlet section (4323).

4. The centrifugal impeller (100) according to claim 3, characterized in that: The air outlet section (4323) is composed of multiple sections, and all of the air outlet sections (4323) are connected to the air inlet section (4321).

5. The centrifugal impeller (100) according to claim 1, characterized in that: The wheel cover (20) is provided with a plurality of drainage channels (24), and all the drainage channels (24) correspond one-to-one to all the flow splitting blades (40); Each of the first parts (43) includes a first trailing edge (436), and each of the guide channels (24) is used to guide the airflow at the position where the first trailing edge (436) corresponding to it is located to the air inlet of the injection channel (432) corresponding to it, and the first trailing edge (436) and the second part (44) corresponding to it define and form the diversion channel (45).

6. The centrifugal impeller (100) according to claim 5, characterized in that: Each of the drainage channels (24) further comprises a drainage section (241) and an air collecting section (243), and the air collecting section (243) of each of the drainage channels (24) is connected between the corresponding drainage section (241) and the injection channel (432).

7. The centrifugal impeller (100) according to claim 1, characterized in that: Each of the second parts (44) comprises an arc-shaped main body section (441) which defines the diversion channel (45) with the corresponding first part (43), and the curvature of the arc-shaped main body section (441) is greater than the curvature of the first part (43).

8. The centrifugal impeller (100) according to claim 7, characterized in that: Each of the second portions (44) further comprises a trailing edge segment (443) which is sequentially arranged and connected to the arc-shaped main body segment (441) along the airflow outflow direction of the air duct (50) in which it is located, and the trailing edge segment (443) extends in the radial direction of the centrifugal impeller (100).

9. A compressor, characterized in that: It comprises a centrifugal impeller (100) as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that: Comprising the compressor as claimed in claim 9 above.

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