CN-122014647-A - Fan and refrigeration equipment

Abstract

The application discloses a fan and refrigeration equipment, wherein the fan comprises an air duct, a first impeller and a second impeller, the first impeller is rotatably arranged in the air duct, the first impeller comprises a first hub and first blades arranged on the first hub, the installation angle of the first blades is W 1 ,25°≤W 1 -42 degrees, the second impeller is rotatably arranged in the air duct, the second impeller comprises a second hub and second blades arranged on the second hub, the installation angle of the second blades is W 2 ,25°≤W 2 -40 degrees, and the installation angle of the second blades is I W 1 -W 2 -8 degrees. The fan provided by the application is beneficial to effectively improving the air quantity on the premise of not excessively improving the rotating speed or increasing the diameter of the impeller, avoiding the remarkable increase of noise caused by excessively high rotating speed or excessively large impeller, reducing the phenomena of turbulence and boundary layer separation, improving the static pressure efficiency, reducing the operation noise while realizing large air quantity output, and improving the overall aerodynamic performance and energy efficiency of the fan.

Inventors

• FANG TAO
• ZHANG WEI
• CHEN HAIYAN
• ZHANG YINGYING
• XU CHENG

Assignees

• 瑞纳智能设备股份有限公司

Dates

Publication Date

20260512

Application Date

20260409

Claims (10)

1. 1. A fan, characterized by comprising The wind tube is provided with a wind tube, The first impeller is rotatably arranged in the air duct and comprises a first hub and first blades arranged on the first hub, and the installation angle of the first blades is W 1 ,25°≤W 1 -42 degrees; The second impeller is rotatably mounted in the air duct and comprises a second hub and second blades arranged on the second hub, the mounting angle of each second blade is W 2 ,25°≤W 2 -40 degrees, the mounting angle of each second blade is |W 1 -W 2 | -8 degrees, and the axial gap B 1 between the first impeller and the second impeller is 10-60 mm.
2. 2. The fan of claim 1, wherein the inlet end of the air duct is provided with an outward first rounded corner flange.
3. 3. The fan of claim 2, wherein the air outlet end of the air duct is provided with an outward second rounded corner flange.
4. 4. A fan as claimed in claim 3, wherein the radius of the fillet of the first fillet bead is 50mm to 150mm, and/or The radius of the fillet of the second fillet turn-ups is 50mm ~150mm.
5. 5. The fan of claim 1, wherein the inlet air mounting angle of the first blade is W 11 ,10°≤|W 11 -W 1 & lt 20 DEG, and/or The air outlet installation angle of the first blade is W 12 ,10°≤|W 12 -W 1 I is less than or equal to 20.
6. 6. The fan of claim 1, wherein the inlet air mounting angle of the second blade is W 21 ,10°≤|W 21 -W 2 & lt 20 DEG, and/or The air outlet installation angle of the second blade is W 22 ,10°≤|W 22 -W 2 degrees or less than 20 degrees.
7. 7. The wind turbine of claim 1, wherein the first blade has a blade leading edge camber angle a 1 ,20°≤A 1 +.40 ° and the first blade has a blade trailing edge camber angle a 2 ,|A 1 -A 2 +.10 °.
8. 8. The wind turbine of claim 1, wherein the second blade has a blade forward bend angle a 3 ,40°≤A 3 +.60 °, and the second blade has a trailing edge forward bend angle a 4 ,|A 3 -A 4 +.15 °.
9. 9. The fan as claimed in claim 1, wherein the hub ratio of the first impeller is 2-3.5, the relationship between the outer edge length L 1 of the first blade and the root length L 2 is 1.5- 1 /L 2 -3.5, and/or The hub ratio of the second impeller is 2-3.5, and the relation between the outer edge length L 3 of the second blade and the blade root length L 4 is 1.5-L 3 /L 4 -3.5.
10. 10. A refrigeration device comprising a fan as claimed in any one of claims 1 to 9.

Description

Fan and refrigeration equipment Technical Field The application relates to the technical field of refrigeration equipment, in particular to a fan and refrigeration equipment. Background At present, the requirements of the heat pump and air conditioner field on the large air quantity and low noise performance of the fan are increasingly improved, and the traditional single-impeller axial flow fan is main flow application equipment in the field. However, in the related art, the traditional single-impeller axial flow fan has obvious technical defects, the air quantity is improved mainly by two ways of improving the rotating speed and increasing the impeller diameter, and the two ways can lead to remarkable increase of noise of an air conditioning system, so that the use experience of users is seriously affected. Meanwhile, the conventional fan air duct structure is unreasonable in design and low in static pressure efficiency, air volume improvement and noise control are further limited, and the single-impeller structure is prone to turbulence, boundary layer separation and other problems, so that the fan efficiency is low, the energy consumption is high, and the use requirements of the current field on energy-saving, environment-friendly and high-performance fans cannot be met. Disclosure of Invention The embodiment of the application provides a fan and refrigeration equipment to solve at least one technical problem. The fan of the embodiment of the application comprises The wind tube is provided with a wind tube, The first impeller is rotatably arranged in the air duct and comprises a first hub and first blades arranged on the first hub, and the installation angle of the first blades is W 1,25°≤W1 -42 degrees; The second impeller is rotatably mounted in the air duct and comprises a second hub and second blades arranged on the second hub, the mounting angle of each second blade is W 2,25°≤W2 -40 degrees, the mounting angle of each second blade is |W 1-W2 | -8 degrees, and the axial gap B 1 between the first impeller and the second impeller is 10-60 mm. According to the fan provided by the application, a double-impeller structure is formed by arranging the first impeller and the second impeller, the installation angle W 1 of the first impeller is limited in the range of 25-42 degrees, the installation angle W 2 of the second impeller is limited in the range of 25-40 degrees, and meanwhile, the angle difference between the first impeller and the second impeller is controlled to be not more than 8 degrees, so that the two impellers form cooperative matching on aerodynamic performance, the air quantity is effectively improved on the premise of not excessively improving the rotating speed or increasing the diameter of the impellers, the noise caused by excessively high rotating speed or excessively large impellers is prevented from being obviously increased, and the axial gap B 1 between the first impeller and the second impeller is controlled to be between 10mm and 60mm, so that reasonable transition and rectification space is provided for the air flow between the stages, the phenomena of turbulence vibration and boundary layer separation are reduced, the static pressure efficiency is improved, the running noise is reduced while the large air quantity output is realized, and the overall aerodynamic performance and the energy efficiency of the fan are improved. In some embodiments, the air inlet end of the air duct is provided with an outward first rounded flange. Therefore, the outward first round corner flanging is arranged at the air inlet end of the air duct, so that the flanging forms a collector structure, the air flow is guided to be intensively sucked in a streamline mode, the flow separation and resistance loss of the air inlet are reduced, the rapid suction of a large amount of air flow is realized, and the air inlet efficiency and the effective air quantity are improved. In some embodiments, the air outlet end of the air duct is provided with an outward second rounded flanging. According to the Bernoulli principle, static pressure is recovered and further increased after the flow speed of the fluid is slowed down, so that the pressure at the outlet of the fan is improved, and the improvement of static pressure efficiency and the reduction of exhaust loss are realized. In some embodiments, the radius of the fillet of the first fillet flange is 50 mm-150 mm, and/or The radius of the fillet of the second fillet turn-ups is 50mm ~150mm. Therefore, the fillet radius of the first fillet flanging and the fillet flanging is limited, so that a large amount of air flow is guaranteed to be sucked quickly, vortex loss of the air inlet is reduced to the maximum extent, air inlet efficiency and flow stability are improved, and meanwhile, the maximum recovery of static pressure is realized on the premise of avoiding boundary layer separation, so that the static pressure efficiency of a fan outlet is effectively improve