Small-diameter efficient integrated fan blade

Abstract

The utility model belongs to the technical field of fan blade structures, and discloses a small-diameter high-efficiency integrated fan blade which comprises an impeller and a blade, the impeller and the blade are integrally formed, the whole wall thickness of the blade is equal, a slightly upward protruding part is arranged in the middle of the blade, the tip of the blade is slightly swept back, and the blade tip of the blade is slightly swept back. A concave area is arranged on the upper surface of the blade close to the blade tip, the outer side of the concave area is turned upwards, and one or more cutting airflow stripes are arranged in the sweepback turned edge. According to the integrated fan blade disclosed by the utility model, the middle of the blade is provided with the slightly upward lug boss, so that the overall shape layout of the blade is changed, the pressure distribution is balanced, and the efficiency is improved. And the blade tips of the blades are slightly swept back, so that the resistance during rotation can be reduced. The cutting airflow stripes are arranged in the sweepback turned-over edge, under the designed large air volume, the airflow stripes can cut a turbulent flow area, and aerodynamic noise brought by the fan blades is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of fan blade structure, especially to a high -efficient integrated fan blade of small diameter size. BACKGROUND

[0002] In the refrigeration industry, some small diameter axial flow fan blades are often used at the evaporation and condensation end. Axial flow fan blade is a fan component, whose working principle is to suck gas from the inlet and discharge it in the axial direction under the push of the blades through the rotation of the impeller. The airflow direction of the axial flow fan blade is parallel to the axis of the impeller, hence the name "axial flow". The main components of the axial flow fan blade include the impeller and the blades. When the impeller rotates, the gas enters the impeller axially from the inlet, and the energy of the gas is increased by the pushing of the blades on the impeller. Subsequently, the gas enters the blades, which change the deflected airflow into axial flow and guide the gas into the diffuser pipe to further convert the kinetic energy of the gas into pressure energy, and finally discharge it through the working pipe.

[0003] Fan back pressure refers to the resistance or pressure that the fan encounters during operation. When the fan is working, it will produce airflow, and these airflows will encounter resistance at the outlet behind the fan. This resistance is the fan back pressure.

[0004] The impact of fan back pressure on fan performance:

[0005] 1. Reduced air volume

[0006] When the fan faces a larger back pressure, the airflow will encounter greater resistance when passing through the outlet, resulting in a slower airflow speed. Since the air volume is directly proportional to the airflow speed, an increase in back pressure will result in a decrease in air volume.

[0007] 2. Increased noise

[0008] When facing a larger back pressure, the fan needs more energy to overcome the resistance. In order to provide sufficient power, the motor needs to run at a higher speed. This will generate more noise.

[0009] 3. Reduced energy efficiency

[0010] When the air volume decreases and the noise increases, the power consumption will also increase due to the decrease in efficiency. This means that the fan will consume more energy for the same power output.

[0011] 4. Shortened lifespan

[0012] Since the fan needs to operate under higher load, the motor and other components will be more prone to wear and tear. Therefore, an increase in back pressure will result in a shorter lifespan of the fan.

[0013] The small-diameter fan blade is prone to air flow analysis under the back pressure and at a low rotating speed, resulting in reduced efficiency. Therefore, designing a high-efficiency fan blade for the back pressure can provide more air volume and lower power consumption for the whole system.

[0014] The small-diameter fan blade for the condensing and evaporating end on the market usually has large air volume at 0 Pa, but the air volume rapidly decreases as the back pressure rises, and the power is always increasing. Since the thickness of the small-diameter integrated fan blade does not change much, an equal wall thickness structure is mostly used. There is no significant improvement on the blade.

[0015] For the condensing or evaporating end, the working pressure is usually in the working range of 0-50 Pa, and the working pressure increases as the size of the application end increases. For example, the working pressure of the commonly used 200mm-diameter fan blade is mostly in the range of 20 Pa-30 Pa, and the working pressure of the 230mm, 250mm, etc. increases accordingly. How to design to ensure that the air volume and efficiency of the fan blade in the pressure range are the highest becomes a problem to be solved. Invention content

[0016] The utility model aims at providing a small-diameter high-efficiency integrated fan blade to solve the above technical problems.

[0017] To achieve the above purpose, the specific technical scheme of the small-diameter high-efficiency integrated fan blade of the utility model is as follows:

[0018] A small-diameter high-efficiency integrated fan blade, comprising an impeller and a blade, the impeller and the blade are integrally formed, the wall thickness of the whole blade is equal, the blade has a slightly upward convex part in the middle, the tip of the blade is slightly swept back, that is, there is a concave area near the tip on the upper surface of the blade, the outer side of the concave area is upwardly bent, and there is one or more cutting air flow stripes in the bent back.

[0019] Further, the impeller comprises a shaft center part and a connecting part, the shaft center part is a flat sheet shape, has a plurality of rotating shaft fixing holes in the center for fixed connection with the rotating shaft, and the edge of the shaft center part extends outwardly and has a plurality of connecting parts for connection with the blades.

[0020] Further, the connecting part is five, and five blades are connected.

[0021] Further, the connecting part comprises an arc surface one and an arc surface two, the arc surface one and the arc surface two are curved in opposite directions to form an S-shaped curved surface.

[0022] Further, the blade is connected with the impeller through the connecting part near the shaft center one end of the impeller, and the end away from the shaft center is in an arc shape, and the outer ends of the plurality of blades are connected in an arc shape to form a circle.

[0023] Further, one side of the blade is inclined towards the front surface of the fan blade of the impeller, and the other side is inclined towards the back surface of the fan blade, and the airflow passing through the blade forms an axial flow under the action of the inclined surface.

[0024] Further, the cutting airflow stripe is three.

[0025] Further, the fan blade diameter is 170mm, 200mm, 230mm, 250mm.

[0026] The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0027] The blade tip is slightly swept back, which can reduce the resistance during rotation. The cutting airflow stripe is arranged in the swept-back flange, and under the design of large air volume, the airflow stripe can cut the turbulent flow area and reduce the aerodynamic noise caused by the fan blade. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0029] Fig. 2 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0030] Fig. 3 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0031] Fig. 4 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0032] Fig. 5 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0033] Fig. 6 The small-diameter-size high-efficiency integrated fan blade has the following advantages: the integrated fan blade has a slightly upward protruding portion in the middle of the blade, which changes the overall shape layout of the blade, balances the pressure distribution, and improves the efficiency.

[0034] Marked in the figure: 1, impeller; 11, shaft portion; 111, rotating shaft fixing hole; 12, connecting portion; 121, arc surface one; 122, arc surface two; 2, blade; 21, protruding portion; 22, cutting airflow stripe. DETAILED DESCRIPTION

[0035] In order to better understand the purpose, structure and function of the utility model, the small-diameter-size high-efficiency integrated fan blade will be further described in detail below in combination with the drawings.

[0036] As Figs. 1-3 shown, the utility model discloses a high -efficient integral fan blade of small diameter size, including impeller 1 and blade 2, impeller 1 and blade 2 are integrally formed, and impeller 1 includes shaft center part 11, connecting portion 12, and the shaft center part 11 is flat sheet shape, and has multiple pivot fixing holes 111 in the center for fixed connection with the pivot, and multiple connecting portions 12 extend outward from the edge of the shaft center part 11, and the connecting portion 12 is used to be connected with the blade 2, and preferably the connecting portion 12 is five, and five blades are connected. Connecting portion 12 includes camber surface one 121 and camber surface two 122, and the bending direction of camber surface one 121 and camber surface two 122 is opposite, forming S-shaped curved surface, when the impeller rotates, the gas enters the impeller from the air inlet axially, and the energy of the gas is increased by the S-shaped curved surface of the connecting portion 12, and then the gas enters the blade 2, and the blade 2 changes the deflected airflow into axial flow.

[0037] The wall thickness of the blade 2 is equal, one end (the end close to the impeller shaft center) of the blade 2 is connected with the impeller 1 through the connecting portion 12, and the outer end (the end away from the shaft center) is in arc shape, the outer ends of the multiple blades 2 are connected in arc shape to form a circle, which can increase the cutting area of the blade 2 to the airflow. One side of the blade 2 is inclined to the front surface of the fan blade of the impeller 1, and the other side is inclined to the back surface of the fan blade, and the airflow passing through the blade 2 forms axial flow under the action of the inclined surface.

[0038] When the Reynolds number of the airflow decreases (i.e. when the gas flow is relatively stable), the blade 2 is not suitable for making the blade tip do more work to generate air volume, which will reduce the efficiency. In order to make the fan blade at low speed more efficient, the blade 2 of the utility model has a slightly upward protruding portion 21 in the middle, which can change the surface pressure distribution of the blade 2 and effectively improve its efficiency. As the size of the fan blade decreases, the main working interval on the surface of the fan blade is close to the blade center and the blade root.

[0039] The blade tip of the blade 2 is slightly swept back, that is, there is a concave area near the blade tip on the upper surface of the blade 2, and the outer side of the concave area is upwardly turned over, which can reduce the resistance during rotation. However, noise will be generated at the turned-over edge during rotation of the blade 2, and the utility model sets one or more airflow cutting stripes 22 in the turned-over edge of the sweepback, preferably three. Under the design of large air volume, the airflow stripes 22 can divide the turbulent flow area and reduce the aerodynamic noise brought by the fan blade.

[0040] In the embodiment, preferably, the diameter of the fan blade is 170mm, 200mm, 230mm or 250mm.

[0041] As Figs. 4-6As shown in the following table, it is the efficiency and air volume test curve of the existing 200mm aluminum fan blade, the toothed fan blade made of plastic ABS material and the fan blade of the utility model under 1500 RPM, and the results show that the fan blade efficiency of the utility model is higher than that of the existing fan blade, the air volume rises slowly with the increase of static pressure, and under the same resistance, the fan blade can provide more air volume, has higher efficiency and lower power consumption.

[0042] As shown in the following table, it is the efficiency and air volume test curve of the existing 200mm aluminum fan blade, the toothed fan blade made of plastic ABS material and the fan blade of the utility model under 1500 RPM, and the results show that the fan blade efficiency of the utility model is higher than that of the existing fan blade, the air volume rises slowly with the increase of static pressure, and under the same resistance, the fan blade can provide more air volume, has higher efficiency and lower power consumption.

[0043]

[0044] It can be understood that the utility model is described through some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the utility model. In addition, these features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the utility model without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the scope protected by the utility model.

Claims

1. A high efficiency integrated fan blade of small diameter size comprising an impeller (1) and a blade (2), said impeller (1) and blade (2) being integrated, the wall thickness of said blade (2) being uniform, characterized in that, The blade (2) has a slightly upward convex part (21) in the middle, the blade tip of the blade (2) is slightly swept back, that is, there is a concave area near the blade tip on the upper surface of the blade (2), the outer side of the concave area is upwardly turned over, and one or more cutting airflow stripes (22) are arranged in the turned-over back-swept part.

2. The high efficiency integrated blade of small diameter size according to claim 1, characterized by, The impeller (1) comprises a shaft center part (11) and a connecting part (12), the shaft center part (11) is a flat sheet with a plurality of rotating shaft fixing holes (111) in the center for fixed connection with a rotating shaft, and a plurality of connecting parts (12) are outwardly extended from the edges of the shaft center part (11) for connection with the blades (2).

3. The high efficiency integrated blade of small diameter size according to claim 2, wherein, The connecting part (12) is five, and the five connecting parts (12) are connected with five blades (2).

4. The high efficiency integrated blade of small diameter size according to claim 2, wherein, The connecting part (12) comprises an arc surface one (121) and an arc surface two (122), the arc surface one (121) and the arc surface two (122) are curved in opposite directions to form an S-shaped curved surface.

5. The high efficiency integrated blade of small diameter size according to claim 1, wherein, The blade (2) is connected with the impeller (1) through the connecting part (12) near the shaft center end of the impeller (1), and the end away from the shaft center is in an arc shape, and the outer end arcs of a plurality of blades (2) are connected in a circular shape.

6. The high efficiency integrated blade of small diameter size as claimed in claim 1, wherein, One side of the blade (2) is inclined to the front surface of the fan blade of the impeller (1), and the other side is inclined to the back surface of the fan blade, and the airflow passing through the blade (2) forms an axial flow under the action of the inclined surface.

7. The high efficiency integrated blade of small diameter size according to claim 1, wherein, The cutting airflow stripe (22) is three.

8. The high efficiency integrated blade of small diameter size according to claim 1, wherein, The diameter of the fan blade is 170mm, 200mm, 230mm or 250mm.

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