Axial flow wind wheel, axial flow fan, heating and ventilation equipment outdoor unit and heating and ventilation equipment
By designing an axial flow impeller with progressively increasing blade leading edge slope and a turbulence structure at the blade trailing edge, the problem of uneven impeller pressure distribution was solved, aerodynamic noise was reduced, and the performance of the impeller and the user experience were improved.
Patent Information
- Application Number
- CN202520262956.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-18
AI Technical Summary
In outdoor units of HVAC equipment, the different work capacities of different basic units of the fan impeller blades lead to uneven pressure distribution and increase aerodynamic noise.
Design an axial flow wind turbine with the leading edge bend angle of the blades increasing from the blade root to the blade tip, forming a significant work phase difference at the blade tip, and a turbulence structure is set at the trailing edge of the blade to suppress the development of turbulent vortices.
By adjusting the pressure distribution at the blade tip, the radial flow and turbulent vortex development at the blade tip are reduced, aerodynamic noise is lowered, and the performance and noise level of the fan are improved.
Smart Images
Figure CN223754312U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heating equipment technical field especially relates to a axial flow fan wheel, axial flow fan, heating equipment outdoor unit and heating equipment. BACKGROUND
[0002] This part provides only background information related to the present disclosure, which is not necessarily prior art.
[0003] In the heating equipment outdoor unit, the design of the fan air duct has a greater influence on the performance and noise of the whole machine, and the different element levels of the fan wheel blades have different working capacities, which leads to uneven pressure distribution on the blade surface and causes the radial flow on the blade surface, especially the blade top, resulting in increased aerodynamic noise. SUMMARY
[0004] The utility model discloses a kind of axial flow fan wheels, and the purpose of the utility model is to at least solve the problem of uneven pressure distribution caused by different element levels of the fan wheel.
[0005] The first aspect of the utility model provides an axial flow fan wheel, comprising:
[0006] A hub has a predetermined rotation direction.
[0007] A plurality of blades are spaced apart on the hub in the circumferential direction of the hub, each blade includes a blade root portion and a blade tip portion, the blade root portion is connected to the hub, and the blade tip portion extends away from one end of the hub in the radial direction of the hub.
[0008] The slope of the bend angle of the leading edge of the plurality of element levels is incrementally arranged in the direction from the blade root portion to the blade tip portion.
[0009] The axial flow fan wheel of the utility model has the slope of the bend angle of the leading edge of the plurality of element levels in the direction from the blade root portion to the blade tip portion, the front bending trend is stronger as it is closer to the blade tip portion, and the phase difference of the blade tip portion is more obvious, so that a clear working phase difference is formed at the blade tip portion position, thereby adjusting the pressure distribution of the blade tip portion, suppressing the development of the radial flow at the blade tip portion and the turbulent vortex at the blade tip portion, and reducing aerodynamic noise.
[0010] In addition, the axial flow fan wheel according to the utility model can also have the following additional technical features:
[0011] In some embodiments of the utility model, the angle of the curved corner of the leading edge is the angle of the leading edge of the elementary stage at the blade tip relative to the leading edge of the hub, and the angle of the curved corner of the leading edge ranges from 20 DEG to 70 DEG.
[0012] In some embodiments of the utility model, the angle of the curved corner of the leading edge of the elementary stage at the blade tip is a first angle, and the angle of the wrap angle of the elementary stage at the blade tip is a second angle, and the first angle is 20% to 60% of the second angle.
[0013] Wherein, the rear edge of the blade is circumferentially located at the rear side, the rear edge is oppositely arranged with the leading edge, the angle of the curved corner of the leading edge at the blade tip is the angle of the leading edge of the elementary stage at the blade tip relative to the leading edge of the hub, and the angle of the wrap angle at the blade tip is the angle of the leading edge of the elementary stage at the blade tip relative to the rear edge of the elementary stage at the blade tip.
[0014] In some embodiments of the utility model, the rear edge of the blade is provided with a spoiler structure.
[0015] The second aspect of the utility model provides an axial flow fan, which comprises a motor and an axial flow fan wheel as described in any one of the above, the motor is connected with the axial flow fan wheel, and is used for driving the axial flow fan wheel to rotate.
[0016] The third aspect of the utility model provides an air conditioning equipment outdoor unit, which comprises an outdoor unit box body and an axial flow fan as described above, the axial flow fan is arranged on the outdoor unit box body, the outdoor unit box body is provided with an air inlet and an air outlet, and an airflow circulation path is formed between the air inlet and the air outlet.
[0017] In some embodiments of the utility model, the air conditioning equipment outdoor unit further comprises a flow guide piece, the flow guide piece is sleeved on the outer side of the axial flow fan, the flow guide piece comprises an inlet section, a diffuser section and an intermediate section, the intermediate section is connected between the inlet section and the diffuser section, and at least part of the spoiler structure is arranged in the intermediate section.
[0018] In some embodiments of the utility model, the flow guide piece is provided with a noise reduction structure, and the diffuser section and / or the inlet section are provided with the noise reduction structure.
[0019] In some embodiments of the utility model, the air conditioning equipment outdoor unit further comprises a heat exchanger, the heat exchanger is arranged in the outdoor unit box body and located on the side of the axial flow fan away from the air outlet.
[0020] The fourth aspect of the utility model provides a kind of heating equipment, including heating equipment indoor unit and the heating equipment outdoor unit as described in any of the above, the heating equipment indoor unit and the heating equipment outdoor unit are connected by pipeline. BRIEF DESCRIPTION OF DRAWINGS
[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the utility novel. Moreover, in the drawings, the same reference numerals are used to designate similar parts throughout the several views. In the drawings:
[0022] Figure 1 The structure schematic diagram of the axial flow fan according to the utility model embodiment is schematically shown;
[0023] Figure 2 The local conceptual schematic diagram of the blade of the axial flow fan according to the utility model embodiment is schematically shown;
[0024] Figure 3 The bending angle schematic of the blade of the axial flow fan according to the utility model embodiment is schematically shown Figure 1 ;
[0025] Figure 4 The bending angle trend change diagram of the blade of the axial flow fan according to the utility model embodiment is schematically shown;
[0026] Figure 5 The bending angle schematic of the blade of the axial flow fan according to the utility model embodiment is schematically shown Figure 2 ;
[0027] Figure 6 The structure schematic diagram of the heating equipment outdoor unit according to the utility model embodiment is schematically shown;
[0028] Figure 7 The sectional view of the heating equipment outdoor unit according to the utility model embodiment is schematically shown;
[0029] Figure 8 The structure schematic diagram of the flow guide piece of the heating equipment outdoor unit according to the utility model embodiment is schematically shown.
[0030] The reference signs are as follows:
[0031] 100, axial flow fan;
[0032] 11, hub;12, blade;121, blade root portion;122, blade top portion;123, leading edge;124, trailing edge;13, spoiler structure;
[0033] A, preset rotating direction;
[0034] 200, outdoor unit of heating and ventilation equipment;
[0035] 21, flow guide; 211, inlet section; 212, diffuser section; 213, middle section; 214, flow guide channel; 215, noise reduction structure;
[0036] 22, outdoor unit box; 221, air inlet; 222, air outlet; 223, air flow path;
[0037] 23, power assembly; 231, compressor; 232, liquid accumulator; 233, heat exchanger. DETAILED DESCRIPTION
[0038] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.
[0039] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0040] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second", and the like are used herein to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments.
[0041] For the sake of description, spatial relative terms can be used herein for describing a relationship of one element or feature to another element or feature as illustrated in the figures, such as "inner", "outer", "inner side", "outer side", "under", "below", "above", "on", and the like. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The embodiments of the present application can include devices that otherwise have the same or similar structure as devices described but are turned over or used in an orientation described as "below" or "beneath" another part of the device.
[0042] As shown in the drawings, Figures 1 to 5 According to the embodiments of the present application, an axial flow fan 100 is provided, which comprises a circular hub 11 with an axial center and a plurality of blades 12 distributed equidistantly on the outer periphery of the hub 11, the hub 11 has a preset rotation direction A, the number of blades 12 in the present embodiment is three, the three blades 12 are arranged on the hub 11 at intervals along the circumferential direction of the hub 11, each blade 12 comprises a uniform root 121 and a tip 122, the root 121 is connected with the hub 11, the tip 122 extends away from one end of the hub 11 in the radial direction of the hub 11, along the preset rotation direction A, the front side edge of the blade 12 is the leading edge 123, along the direction from the root 121 to the tip 122, the blade 12 is divided into a plurality of element levels, the element level is a different radius cross section of the blade 12, as shown in the drawings, Figure 3 and Figure 5 As shown in the drawings, o0, o1, o2, o3, o4 in the drawings are different element levels of the blade 12; along the direction from the root 121 to the tip 122, the slope of the bending angle of the leading edge 123 of the plurality of element levels is arranged in an increasing manner. Each blade 12 has a front surface and a back surface, the front surface is the front surface of the blade 12, the back surface is the back surface of the blade 12, which is also the surface of the air inlet direction.
[0043] The axial flow fan 100 of the present application has the slope of the bending angle of the leading edge 123 of the blade 12 along the direction from the root 121 to the tip 122 in an increasing trend, the bending angle trend is stronger closer to the tip 122, and the phase difference of the tip 122 is more obvious, so that an obvious working phase difference is formed at the position of the tip 122, thereby adjusting the pressure distribution of the tip 122, inhibiting the development of the tip radial flow and the turbulent vortex at the tip, and reducing the aerodynamic noise.
[0044] In some embodiments of this utility model, the angle of the bend of the leading edge 123 is the angle of the leading edge 123 of the corresponding primitive level relative to the leading edge of the hub 11, and the range of the bend angle of the leading edge 123 is 20°-70°. The forward bend angle is the angle formed by connecting the leading edge point of the primitive level with the center of the hub 11 and the leading edge point of the hub 11. This parameter is used to control the forward sweep angle of different primitive levels. Please refer to [link / reference]. Figure 3 , Figure 3 The angles a4oa0, a3oa0, a2oa0, and a1oa0 shown are the bends of the leading edge 123. The bend of the leading edge 123 can be 20°, 30°, 35°, 45°, 55°, 60°, or 70°. By setting the above angle range, the phase difference when the blade 12 does work can be guaranteed, so that the pressure distribution on the surface of the blade 12 is uniform, thereby reducing radial flow and flow separation, and reducing noise.
[0045] In some embodiments of this utility model, the angle of the bend of the leading edge 123 of the elementary stage located at the blade tip 122 is a first angle, and the angle of the wrap angle of the elementary stage located at the blade tip 122 is a second angle. The first angle is 20%-60% of the second angle. Specifically, the rear edge of the blade 12 in the circumferential direction is the trailing edge 124. The leading edge 123 and the trailing edge 124 are respectively close to the axial ends of the hub 11. The trailing edge 124 is arranged opposite to the leading edge 123. The angle of the bend of the leading edge 123 of the blade tip 122 is the angle of the leading edge 123 of the elementary stage of the blade tip 122 relative to the leading edge of the hub 11. Please refer to [link to relevant documentation]. Figure 5 , Figure 5 The angle a4oa0 shown is the bend angle of the leading edge 123 of the blade tip 122, i.e., the first angle mentioned above. The wrap angle of the blade tip 122 is the angle between the leading edge 123 of the blade tip 122 and the trailing edge 124 of the blade tip 122. The wrap angle is the angle formed by connecting the leading and trailing edge points of the element level with the center of the hub 11. Figure 5 The angle a4ob4 shown is the wrap angle of the blade tip 122, i.e., the second angle mentioned above. The bend angle of the leading edge 123 of the blade tip 122 is 20%-60% of the wrap angle. That is, for example, when the wrap angle of the blade tip 122 is 100°, the bend angle of the leading edge 123 of the blade tip 122 can be any value within the range of 20°, 30°, 45°, 55°, 60°, or 20°-60°. Setting the bend angle of the leading edge 123 of the blade tip 122 within the range of 20%-60% of the wrap angle ensures both the phase difference of the leading edge 123 line and the shape of the trailing edge 124 line, suppressing the radial flow of the trailing edge 124.
[0046] In order to reduce the noise that may be formed in the working process of the axial flow fan 100, in some embodiments of the utility model, the trailing edge 124 of the blade 12 is provided with a spoiler structure 13. Specifically, along the preset rotation direction A of the axial flow fan 100, the spoiler structure 13 is arranged on the trailing edge 124, and the spoiler structure 13 is arranged in the trailing edge 124 area, so as to prevent noise when the airflow separates from the blade 12, and further reduce the noise of the axial flow fan. The spoiler structure 13 comprises a plurality of sawteeth, and the plurality of sawteeth are arranged at intervals along the length direction of the blade 12. When the airflow moves on the blade 12, the spoiler structure 13 can prevent the airflow from forming vortex on the blade 12, thereby reducing the possibility of noise generated by the airflow in the flow process.
[0047] The second aspect of the utility model provides an axial flow fan, comprising a motor and the above-mentioned axial flow fan 100, the motor is connected with the axial flow fan 100, and is used for driving the rotation of the axial flow fan 100.
[0048] The axial flow fan described in the embodiment has stable performance and small noise by improving the structure of the axial flow fan 100.
[0049] As Figures 6 to 8 The third aspect of the utility model provides an outdoor unit 200 of a heating and ventilation equipment, which comprises an outdoor unit cabinet 22 and the above-mentioned axial flow fan, the axial flow fan is arranged on the outdoor unit cabinet 22, the outdoor unit cabinet 22 is provided with an air inlet 221 and an air outlet 222, and an airflow circulation path 223 is formed between the air inlet 221 and the air outlet 222. Under the action of the axial flow fan 100, the air outside the outdoor unit cabinet 22 enters through the air inlet 221, flows along the airflow circulation path 223 to the air outlet 222, and is discharged outside the outdoor unit cabinet 22.
[0050] In some embodiments of the utility model, the outdoor unit of the heating and ventilation equipment further comprises a heat exchanger 233, and the heat exchanger 233 is arranged in the outdoor unit cabinet 22 and located on the side of the axial flow fan 100 away from the air outlet 222. Different power components 23 are arranged in the outdoor unit cabinet 22, such as the structures or components that the existing outdoor units such as a compressor 231, a liquid storage tank 232 and an electric control box have, which will not be described here.
[0051] In some embodiments of the utility model, the outdoor unit 200 of the heating and ventilation equipment further comprises a flow guide piece 21, the flow guide piece 21 is sleeved on the outer side of the axial flow fan, the flow guide piece 21 comprises an inlet section 211, a diffuser section 212 and an intermediate section 213, the intermediate section 213 is connected between the inlet section 211 and the diffuser section 212, and at least part of the turbulence structure 13 is arranged on the intermediate section 213. Specifically, the flow guide piece 21 has a flow guide channel 214, the flow guide channel 214 is sleeved on the outer side of the axial flow fan 100, and the inner wall surface of part of the flow guide channel 214 and the outer edge of the blade 12 are provided with a preset gap to prevent noise from being generated between the outer edge of the fan wheel and the inner wall of the flow guide channel 214, the preset gap can be set to any value between 5mm and 15mm, and the preset gap between the flow guide piece 21 and the outer edge of the blade 12 can prevent vortex separation on the fan blade, prevent the formation of pulsating air pressure after vortex separation, and thus prevent noise from being generated.
[0052] The flow guide channel 214 is provided with the inlet section 211, the intermediate section 213 and the diffuser section 212, the intermediate section 213 is in a straight cylindrical shape and is arranged between the inlet section 211 and the diffuser section 212, the turbulence structure 13 can be arranged on the inlet section, the diffuser section and the intermediate section 213 respectively, and the turbulence structure 13 is arranged in the region of the trailing edge 124 of the blade 12 to disperse the energy of the vortex formed on the blade 12 and disperse the vortex to prevent noise from being generated by the vortex.
[0053] In some embodiments of the utility model, the diffuser section 212 of the flow guide piece 21 is provided with a first turbulence structure 13, the first turbulence structure 13 is connected with the intermediate section 213, the first turbulence structure 13 can be a protruding part arranged on the inner wall surface of the diffuser section 212, or a combination of a protruding part and a cutting surface part, most of the sawtooth-shaped turbulence structures 13 are arranged on the intermediate section 213, the first turbulence structure 13 is arranged on the diffuser section 212 of the flow guide piece 21, the regular interference frequency of the driven airflow and the surrounding objects is improved when the axial flow fan 100 rotates, the frequency of the low-frequency noise accumulated by the rotation of the fan wheel is improved, the rotating noise sharp edges in the same frequency band are reduced, and thus the low-frequency noise in the use process can be reduced, and the use experience of the user can be effectively improved.
[0054] In some embodiments of the utility model, a second turbulence structure 13 can be arranged on the inlet end of the flow guide piece 21, the second turbulence structure 13 is connected with the intermediate section 213 of the flow guide piece 21, the second noise reduction structure 215 can be a cutting surface part, or a combination of a protruding part and a cutting surface part, and has a technical effect similar to that of the first turbulence structure 13 of the outlet end, the interference frequency of the airflow is improved when multiple cutting surface parts or protruding parts are arranged, the frequency of the low-frequency noise accumulated by the rotation of the fan wheel is improved, the rotating noise sharp edges in the same frequency band are reduced, and thus the low-frequency noise in the use process can be reduced.
[0055] In some embodiments of the utility model, the flow guide 21 is provided with a noise reduction structure 215, the noise reduction structure 215 is formed in the diffuser section 212 and / or the inlet section 211. Among them, the noise reduction structure 215 can be the first spoiler structure 13 or the second spoiler structure 13 described above, the noise reduction structure 215 can be arranged on the inner wall of the diffuser section 212 or the inner wall of the inlet section 211 or the inner wall of the diffuser section 212 and the inlet section 211, by arranging the noise reduction structure 215, the effect of the quietness of the heating and ventilation equipment outdoor unit 200 can be achieved, the air flow capacity is improved, and new air flow noise is not generated.
[0056] The fourth aspect of the utility model proposes a kind of heating and ventilation equipment, including heating and ventilation equipment indoor unit and the above-mentioned heating and ventilation equipment outdoor unit 200, and heating and ventilation equipment indoor unit and heating and ventilation equipment outdoor unit 200 are connected by pipeline.
[0057] The above is only the preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of the change or replacement within the technical range disclosed by the utility model, should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be limited to the protection scope of claim.
Claims
1. A axial flow fan, characterized by, The application relates to a hub flow fan, comprising: a hub, the hub having a preset rotating direction; a plurality of blades, the plurality of blades being arranged on the hub in a circumferential direction of the hub, each of the blades comprising a blade root and a blade tip, the blade root being connected with the hub in a radial direction of the hub, the blade tip extending to an end away from the hub, the front side edge of the blade being a leading edge in the preset rotating direction, the blade having a plurality of element levels in a direction from the blade root to the blade tip; the slope of the bending angle of the leading edge of the plurality of element levels is arranged in an increasing manner in the direction from the blade root to the blade tip.
2. The axial fan according to claim 1, characterized in that the angle of the bending angle of the leading edge is an angle of the leading edge of the corresponding element level relative to the leading edge of the hub, and the angle of the bending angle of the leading edge ranges from 20 DEG to 70 DEG.
3. The axial fan according to claim 1, wherein the angle of the bending angle of the leading edge of the element level at the blade tip is a first angle, and the angle of the wrapping angle of the element level at the blade tip is a second angle, the first angle being 20% to 60% of the second angle; wherein the circumferential rear side edge of the blade is a trailing edge, the trailing edge being arranged opposite to the leading edge, the angle of the bending angle of the leading edge of the blade tip is an angle of the leading edge of the element level at the blade tip relative to the leading edge of the hub, and the angle of the wrapping angle of the blade tip is an angle of the leading edge of the element level at the blade tip relative to the trailing edge of the element level at the blade tip.
4. The axial fan according to claim 3, wherein a spoiler structure is arranged on the trailing edge of the blade.
5. An axial flow fan characterised in that, The application further relates to a hub flow fan, comprising:
6. A heating and ventilation apparatus outdoor unit, characterized by comprising: a motor and the hub flow fan according to any one of claims 1 to 4, the motor being connected with the hub flow fan for driving the hub flow fan to rotate.
7. The outdoor unit of claim 6, wherein The application further relates to a hub flow fan, comprising:
8. The heating and ventilation equipment outdoor unit according to claim 7, wherein an outdoor unit box body and the hub flow fan according to claim 5, the hub flow fan being arranged on the outdoor unit box body, the outdoor unit box body being provided with an air inlet and an air outlet, and an airflow circulation path being formed between the air inlet and the air outlet.
9. The outdoor unit of claim 6, wherein The application further relates to a hub flow fan, comprising:
10. A heating and ventilation device, characterized by an outdoor unit of a heating and ventilation equipment, the outdoor unit comprising a box body and the hub flow fan according to any one of claims 5 to 8, the hub flow fan being arranged on the box body, the box body being provided with an air inlet and an air outlet, and an airflow circulation path being formed between the air inlet and the air outlet. The application further relates to a hub flow fan, comprising: a guide member, the guide member being sleeved on an outer side of the hub flow fan, the guide member comprising an inlet section, a diffuser section and an intermediate section, the intermediate section being connected between the inlet section and the diffuser section, and at least part of the spoiler structure on the hub flow fan being arranged on the intermediate section. The application further relates to a hub flow fan, comprising: a noise reduction structure, the diffuser section and / or the inlet section being provided with the noise reduction structure. The application further relates to a hub flow fan, comprising: a heat exchanger, the heat exchanger being arranged in the box body of the outdoor unit and located on a side of the hub flow fan away from the air outlet. The application further relates to a hub flow fan, comprising: an indoor unit of a heating and ventilation equipment and the outdoor unit of the heating and ventilation equipment according to any one of claims 7 to 9, the indoor unit of the heating and ventilation equipment and the outdoor unit of the heating and ventilation equipment being connected in communication through pipelines.