CN107313977B - Centrifugal fan blade, centrifugal fan and air conditioner - Google Patents
Centrifugal fan blade, centrifugal fan and air conditioner Download PDFInfo
- Publication number
- CN107313977B CN107313977B CN201710610692.5A CN201710610692A CN107313977B CN 107313977 B CN107313977 B CN 107313977B CN 201710610692 A CN201710610692 A CN 201710610692A CN 107313977 B CN107313977 B CN 107313977B
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- China
- Prior art keywords
- blade
- centrifugal fan
- fan blade
- cambered surface
- path
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Links
- 238000000926 separation method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a centrifugal fan blade, a centrifugal fan and an air conditioner. The centrifugal fan blade comprises a plurality of blades which are arranged at intervals along the circumferential direction, a blade path (1) is formed between two adjacent blades, and the blade path (1) is gradually reduced along the direction far away from the central axis of the centrifugal fan blade. The centrifugal fan blade provided by the invention has a more reasonable structure, and can effectively avoid or reduce air flow separation on one side of the non-working surface in the blade path, thereby improving the efficiency of the fan.
Description
Technical Field
The invention belongs to the technical field of air conditioning, and particularly relates to a centrifugal fan blade, a centrifugal fan and an air conditioner.
Background
Centrifugal fans are widely used in air conditioners, and blade path design plays a key role in fan performance and running stability. In the prior art, the cross section contour line of the blade of the centrifugal fan is formed by a plurality of sections of circular arcs, but the contour line of the blade is formed by a plurality of sections of simple circular arcs, so that the pressure of the formed air flow is small, and the air flow separation is easy to occur at one side of the inner non-working surface, thereby influencing the efficiency of the fan.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of providing the centrifugal fan blade, the centrifugal fan and the air conditioner, which are more reasonable in structure, and can effectively avoid or reduce air flow separation on one side of a non-working surface in a blade path, thereby improving the efficiency of the fan.
In order to solve the problems, the invention provides a centrifugal fan blade, which comprises a plurality of blades arranged at intervals along the circumferential direction, wherein a blade path is formed between two adjacent blades, and the blade path is gradually reduced along the direction away from the central axis of the centrifugal fan blade.
Preferably, the blades comprise adjacent first and second blades, the first blade having a first cambered surface facing the second blade, the second blade having a second cambered surface facing the first blade, and a blade path being formed between the first cambered surface and the second cambered surface.
Preferably, the variation of the diameter D of the inscribed circle of the vane path and the variation of the locus S formed by the centers of the inscribed circle in the direction from the inlet end to the outlet end satisfyWherein K is a constant, and the inscribed circle is tangential to the first cambered surface and the second cambered surface at the same time.
Preferably, the first cambered surface is a convex cambered surface, and the second cambered surface is a concave cambered surface.
Preferably, the ratio of the diameter D1 of the inscribed circle at the inlet end of the vane path to the diameter D3 of the inscribed circle at the outlet end of the vane path satisfies 1.05.ltoreq.D1/D3.ltoreq.1.4.
Preferably, the ratio of the diameter D1 of the inscribed circle at the inlet end of the vane path to the diameter D3 of the inscribed circle at the outlet end of the vane path satisfies 1.2.ltoreq.D1/D3.ltoreq.1.3.
Preferably, the number of blades is 40 to 74.
Preferably, the height of the blades is 80-150 mm, wherein the height of the blades refers to the height of the blades extending radially from the center of the centrifugal fan blade.
Preferably, the blade is aerofoil.
According to another aspect of the present invention, there is provided a centrifugal fan including a centrifugal fan blade, the centrifugal fan blade being the centrifugal fan blade described above.
According to another aspect of the present invention, there is provided an air conditioner including a centrifugal fan blade, the centrifugal fan blade being the above-mentioned centrifugal fan blade.
The centrifugal fan blade provided by the invention comprises a plurality of blades which are arranged at intervals along the circumferential direction, wherein a blade path is formed between two adjacent blades, and the blade path is gradually reduced along the direction away from the central axis of the centrifugal fan blade. In the air flow process, as the vane path is gradually reduced along the direction far away from the central axis of the centrifugal fan blade, namely, the vane path is gradually reduced along the air flow direction, the pressure of air can be gradually increased under the action of the gradually contracted vane path, enough pressure is formed in the vane path, the air flow separation of the vanes on the convex side, namely, the side of the split working face, is avoided, the structure is more reasonable, the inner vortex of the air flow in the vane path can be avoided, the air flow efficiency is improved, and the working efficiency of a fan is further improved.
Drawings
FIG. 1 is a schematic diagram of an air duct structure of a centrifugal fan blade according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a centrifugal fan blade according to an embodiment of the present invention;
FIG. 3 is a schematic perspective view of a centrifugal fan blade according to an embodiment of the present invention;
FIG. 4 is a graph comparing different blade path designs in fan efficiency.
The reference numerals are expressed as:
1. leaf canal; 2. a first blade; 3. a second blade; 4. a first cambered surface; 5. and a second cambered surface.
Detailed Description
The arrow direction in the figure is the rotation direction of the centrifugal fan blade.
Referring to fig. 1 to 4 in combination, according to an embodiment of the present invention, a centrifugal fan blade includes a plurality of blades arranged at intervals in a circumferential direction, a blade path 1 is formed between two adjacent blades, and the blade path 1 tapers in a direction away from a central axis of the centrifugal fan blade.
In the air flow process, as the vane channel 1 is gradually reduced along the direction far away from the central axis of the centrifugal fan blade, namely, the vane channel 1 is gradually reduced along the air flow direction, the pressure of air can be gradually increased under the action of the gradually contracted vane channel 1, the non-working surface of the vane in the vane channel 1 is sufficiently pressurized, the vane is prevented from generating air flow separation at one side of the non-working surface, the structure is more reasonable, the air flow can be prevented or reduced from generating inner vortex in the vane channel 1, the air flow efficiency is improved, and the working efficiency of a fan is further improved.
As can be seen from fig. 1, in this embodiment, along with the flow direction of the gas, the inscribed circle diameter D gradually decreases, and D3 < D2 < D1, so that the cross-sectional area of the vane path 1 can be ensured to decrease along the flow direction of the gas, so that the gas pressure gradually increases, the gas flow can be filled in the low pressure area of the non-working surface, and the generation of internal vortex is avoided or reduced.
In this embodiment, the blade includes adjacent first and second blades 2 and 3, the first blade 2 having a first cambered surface 4 facing the second blade 3, the second blade 3 having a second cambered surface 5 facing the first blade 2, and a blade path 1 is formed between the first cambered surface 4 and the second cambered surface 5. The cambered surface air flue is more favorable for forming the blade channel 1 suitable for gas flow, can improve the flow efficiency of air in the blade channel 1, and reduces the generation of internal vortex of air flow.
Preferably, the variation of the diameter D of the inscribed circle of the vane duct 1 and the variation of the locus S formed by the centers of the inscribed circle in the direction from the inlet end to the outlet end satisfyWherein K is a constant, and the inscribed circle is tangential to the first cambered surface 4 and the second cambered surface 5 at the same time. Since the ratio of the change rate of the diameter D of the inscribed circle of the leaf track 1 to the change rate of the track S formed by the center of the inscribed circle is constant, the change rate of the track S formed by the center of the inscribed circle changes along with the change of the change rate of the diameter D of the inscribed circle, the change rate of the track S formed by the center of the inscribed circle can be always consistent with the change rate of the diameter D of the inscribed circle, so that the curvature of S can be matched with the change of the diameter D of the inscribed circleThe blade path 1 which is more in accordance with the fluid flow characteristic is formed, the generation of air flow separation is further reduced, and the working efficiency of the fan is improved.
In this embodiment, the first cambered surface 4 is a convex cambered surface, the second cambered surface 5 is a concave cambered surface, and in the rotation process of the centrifugal fan blade, the first cambered surface 4 is a non-working surface, and the second cambered surface 5 is a working surface, so that the working on the air flow is facilitated, the flow efficiency of the air flow is improved, and the working performance of the centrifugal fan blade is improved.
Preferably, the ratio of the diameter D1 of the inscribed circle at the inlet end of the vane path 1 to the diameter D3 of the inscribed circle at the outlet end of the vane path 1 satisfies 1.05.ltoreq.D1/D3.ltoreq.1.4. More preferably, the ratio of the diameter D1 of the inscribed circle at the inlet end of the vane path 1 to the diameter D3 of the inscribed circle at the outlet end of the vane path 1 satisfies 1.2.ltoreq.D1/D3.ltoreq.1.3.
As shown in the combined reference of FIG. 4, the efficiency of the fan can be improved by about 8-10% compared with the conventional blade path under the condition of reaching the same air quantity through the tapered blade path.
Preferably, the number of the blades is 40 to 74, and excessive or insufficient number of the blades can be avoided, so that the number of the blades is more reasonable.
Preferably, the height of the blades is 80-150 mm, wherein the height of the blades refers to the height of the blades extending radially from the center of the centrifugal fan blade.
Preferably, the blade is of the airfoil type, and the airfoil type blade is of curved design, so that the airflow distribution on the surface of the blade is more in accordance with the aerodynamic principle.
According to an embodiment of the invention, the centrifugal fan comprises a centrifugal fan blade, and the centrifugal fan blade is the centrifugal fan blade.
According to an embodiment of the invention, the air conditioner comprises a centrifugal fan blade, and the centrifugal fan blade is the centrifugal fan blade.
It will be readily appreciated by those skilled in the art that the above advantageous ways can be freely combined and superimposed without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (8)
1. The centrifugal fan blade is characterized by comprising a plurality of blades which are arranged at intervals along the circumferential direction, wherein a blade path (1) is formed between two adjacent blades, and the blade path (1) is gradually reduced along the direction away from the central axis of the centrifugal fan blade;
the blade comprises a first blade (2) and a second blade (3) which are adjacent, wherein the first blade (2) is provided with a first cambered surface (4) facing the second blade (3), the second blade (3) is provided with a second cambered surface (5) facing the first blade (2), and a blade path (1) is formed between the first cambered surface (4) and the second cambered surface (5);
the variation of the diameter D of the inscribed circle of the blade path (1) along the direction from the inlet end to the outlet end and the variation of the track S formed by the circle center of the inscribed circle satisfy the following conditionsWherein K is a constant, and the inscribed circle is tangential with the first cambered surface (4) and the second cambered surface (5) at the same time;
the first cambered surface (4) is a convex cambered surface, and the second cambered surface (5) is a concave cambered surface.
2. The centrifugal fan blade according to claim 1, wherein the ratio of the diameter D1 of the inscribed circle at the inlet end of the blade path (1) to the diameter D3 of the inscribed circle at the outlet end of the blade path (1) is 1.05-1/D3-1.4.
3. Centrifugal fan blade according to claim 2, characterized in that the ratio of the diameter D1 of the inscribed circle at the inlet end of the blade path (1) to the diameter D3 of the inscribed circle at the outlet end of the blade path (1) is 1.2.ltoreq.d1/d3.ltoreq.1.3.
4. The centrifugal fan blade according to claim 1, wherein the number of the blades is 40 to 74.
5. A centrifugal fan blade according to any one of claims 1-3, wherein the height of the blade is 80-150 mm, wherein the height of the blade refers to the height of the blade extending radially from the centre of the centrifugal fan blade.
6. The centrifugal fan blade according to claim 1, wherein the blade is an airfoil type.
7. A centrifugal fan comprising a centrifugal fan blade, wherein the centrifugal fan blade is according to any one of claims 1 to 6.
8. An air conditioner comprising a centrifugal fan blade, wherein the centrifugal fan blade is the centrifugal fan blade according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710610692.5A CN107313977B (en) | 2017-07-25 | 2017-07-25 | Centrifugal fan blade, centrifugal fan and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710610692.5A CN107313977B (en) | 2017-07-25 | 2017-07-25 | Centrifugal fan blade, centrifugal fan and air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107313977A CN107313977A (en) | 2017-11-03 |
| CN107313977B true CN107313977B (en) | 2024-03-22 |
Family
ID=60179039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710610692.5A Active CN107313977B (en) | 2017-07-25 | 2017-07-25 | Centrifugal fan blade, centrifugal fan and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107313977B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762009B (en) * | 2021-01-28 | 2021-11-30 | 珠海格力电器股份有限公司 | Cross-flow blade, cross-flow fan and air conditioner |
| CN114483648B (en) * | 2022-01-27 | 2024-04-09 | 杭州老板电器股份有限公司 | Blade design the method is blade and centrifugal fan |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000170693A (en) * | 1998-12-11 | 2000-06-20 | Hitachi Ltd | Centrifugal diffuser and electric fan provided therewith |
| EP1741934A1 (en) * | 2005-07-04 | 2007-01-10 | Behr GmbH & Co. KG | Rotor |
| CN201827145U (en) * | 2010-10-26 | 2011-05-11 | 成都泰阳实业有限公司 | Centrifugal fan |
| CN206972610U (en) * | 2017-07-25 | 2018-02-06 | 珠海格力电器股份有限公司 | Centrifugal fan blade, centrifugal fan and air conditioner |
-
2017
- 2017-07-25 CN CN201710610692.5A patent/CN107313977B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000170693A (en) * | 1998-12-11 | 2000-06-20 | Hitachi Ltd | Centrifugal diffuser and electric fan provided therewith |
| EP1741934A1 (en) * | 2005-07-04 | 2007-01-10 | Behr GmbH & Co. KG | Rotor |
| CN201827145U (en) * | 2010-10-26 | 2011-05-11 | 成都泰阳实业有限公司 | Centrifugal fan |
| CN206972610U (en) * | 2017-07-25 | 2018-02-06 | 珠海格力电器股份有限公司 | Centrifugal fan blade, centrifugal fan and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107313977A (en) | 2017-11-03 |
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