CN210343851U - High-efficiency fan - Google Patents

Abstract

The utility model provides a high-efficiency fan, which comprises a central rotor and fan blades arranged on the central rotor, wherein one side surface of the fan blades facing to the air outlet direction is a pressure surface; the pressure surface intercepted by the concentric cylindrical curved surface of the concentric core of the central rotor is an intersecting curve, and the plane expansion line of the intersecting curve is a blade-shaped curve; there are a number of such profile curves as circular arcs: the blade profile curve is a track surface of air slapped by a fan pressure surface (i.e. a surface facing to the axial flow air outlet direction) along the movement direction of the fan pressure surface; the blade profile curve is adjusted to be a circular arc line, the optimization adjustment of the surface of the air fan for direct beating is realized, the air is beaten by the optimal curved surface, the efficiency of the fan is high, the back vortex is few, the large vortex is broken up into small vortices, the vibration of the fan blades and the running wind noise are directly reduced, and the problems of large vibration and high running noise of the fan are solved.

Description

High-efficiency fan

Technical Field

The utility model belongs to the technical field of air conditioning equipment, specificly relate to a high-efficient fan.

Background

Noise and vibration in air conditioners have been an important criteria for the quality of air conditioners. The fan blade of the air conditioner outdoor unit not only requires effective reduction of vibration, but also needs noise reduction, and provides a comfortable environment for users.

Fan vibration and aerodynamic noise are mainly caused by the blades slapping the surrounding air, creating pressure pulsations that simultaneously induce rotational noise, and the surrounding air pressure distribution characteristics causing local vortices that cause vortex noise.

Disclosure of Invention

The utility model aims at providing a high-efficient fan to solve fan operation noise and the big problem of vibration.

The specific scheme is as follows:

a high-efficiency fan comprises a central rotor and fan blades arranged on the central rotor, wherein one side surface of each fan blade facing to an air outlet direction is a pressure surface; the pressure surface intercepted by the concentric cylindrical curved surface of the concentric core of the central rotor is an intersecting curve, and the plane expansion line of the intersecting curve is a blade-shaped curve; there are a plurality of such airfoil curves as circular arcs.

The utility model discloses a further technical scheme does: along the radial direction of the fan blades, the blade profile curves are distributed uniformly at equal intervals by the intersecting curves of the arc lines.

The utility model discloses a further technical scheme does: the adjacent leaf-shaped curves are two intersecting curves of circular arc lines and are connected by a smooth curved surface.

The utility model discloses a further technical scheme does: the blade-shaped curve is convex outward in the direction of the fan airflow.

Has the advantages that: the utility model discloses a high-efficiency fan, which comprises a central rotor and fan blades arranged on the central rotor, wherein one side surface of the fan blades facing to the air outlet direction is a pressure surface; the pressure surface intercepted by the concentric cylindrical curved surface of the concentric core of the central rotor is an intersecting curve, and the plane expansion line of the intersecting curve is a blade-shaped curve; there are a number of such profile curves as circular arcs: the blade profile curve is a track surface of air slapped by a fan pressure surface (i.e. a surface facing to the axial flow air outlet direction) along the movement direction of the fan pressure surface; the blade profile curve is adjusted to be a circular arc line, the optimization adjustment of the surface of the air fan for direct beating is realized, the air is beaten by the optimal curved surface, the efficiency of the fan is high, the back vortex is few, the large vortex is broken up into small vortices, the vibration of the fan blades and the running wind noise are directly reduced, and the problems of large vibration and high running noise of the fan are solved.

Drawings

FIG. 1 illustrates a side view of a high efficiency fan of the present invention;

FIG. 2 illustrates a front view of a plurality of concentric cross-section cross-sectional fans;

FIG. 3 shows a front view of an intersecting curve on a fan blade;

FIG. 4 is an elevation view showing the process of unfolding an intersecting curve;

FIG. 5 shows a developed profile curve;

FIG. 6 shows axial power plots for the comparative example and the inventive example;

figure 7 shows performance graphs for comparative and inventive examples.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 5, the embodiment provides a high efficiency fan, the fan has a central rotor 1, three fan blades 2 are uniformly distributed on the circumference of the central rotor 1, each fan blade has a pressure surface 20 protruding towards the air outlet direction of the axis, and the pressure surface 20 directly slaps the air acting on the front end through the revolution of the central rotor 1 to press the air flow to axially flow out.

The fan of the embodiment is designed and manufactured by the following method, and comprises the following steps:

s1, using the rotation axis of the fan central rotor 1 as the central axis, setting multiple sets of cylindrical concentric cross sections 3, in this embodiment, preferably setting 6 sets of concentric cross sections; the concentric section intersects the pressure surface 20 of the fan blade 2 to obtain an intersection curve 30;

in this step, each adjacent concentric cross section 3 is arranged at equal intervals, and the interval between adjacent concentric cross sections is 1/10 of the turn diameter of fan blade 2. The fan blade 2 is close to the partial section of the central rotor 1, the linear speed is low, the acting area is small, and the optimization design can be omitted; the partial area of the fan blade 2 close to the outer edge needs to be provided with a smooth outer edge transition, and is not suitable for the optimal design of the concentric section 3.

S2, unfolding the intersecting curve 30 in a plane to obtain a blade-shaped curve 31, wherein the specific unfolding mode is that the intersecting curve 30 is unfolded by a plane perpendicular to the radial direction of the fan blade 2, and further the intersecting curve 30 is unfolded in a two-dimensional plane;

s3, adjusting the curvature, radian or inclination angle elements of the blade profile curve according to the performance target or the size target;

in this step, the blade profile 31 is a circular arc line convex toward the fan airflow direction, and has elements of a chord length a and an inclination angle B.

And S4, winding and sequentially arranging each blade profile curve according to the corresponding concentric cross section, and connecting adjacent blade profile curves by smooth curved surfaces to obtain an optimized blade pressure surface.

And S5, establishing an optimized fan model, and obtaining air quantity, pressure, flow field distribution or pressure distribution parameters through CFD numerical simulation analysis.

The pressure surface is provided with a plurality of cylindrical concentric sections which are coaxial with the rotating shaft of the central rotor, and the plane expansion line of the intersecting line of the concentric sections and the pressure surface is an arc line; and along the radial direction of the fan blade 2, the intersecting lines which are unfolded into circular arc lines are uniformly distributed at equal intervals.

After optimization, the profile curve elements of the fan are shown in table 1:

table 1: leaf profile curve element

Compared with the existing fans in the market, namely fans before optimization, the diameter, the number of fan blades, the pressure surface projection and the blade profile axial projection of the existing fans are the same as those of fans after optimization, and the main difference is that the pressure surface of the existing fan is a conventional curved surface, and the intersection line of the pressure surface and the blade profile axial projection is an irregular curve.

The existing fan and the optimized fan in the market are modeled as a model "old" and a model "new", respectively, and CFD numerical simulation analysis is carried out, wherein the rotating speed of the fixed fan is 920rpm, and two fan model performance data tables 2 and 3 are obtained:

table 2: fan model "old" performance data sheet

Table 3: fan model 'new' performance data table

The shaft power curves shown in fig. 6 are plotted according to table 2 and table 3:

according to the shaft power curve, the newly designed fan, namely the model 'new', has the shaft power obviously lower than that of the original fan, namely the model 'old'; under the condition of outputting the same air quantity, the power consumption is less, the vortex flow is less in the running process of the fan, the friction resistance among blade airflows is small, and the noise of the fan is low;

meanwhile, the newly designed fan shaft power is known by combining the shaft power curve, and the newly designed fan shaft power has an obvious 'inflection point' effect, namely the model 'new' shaft power curve is obviously different from the traditional inverted 'U' -shaped shaft power curve of the model 'old', and the flow rate of the model is 8000(m & lt & gt)³In the vicinity of/h), there is a local lowest point of shaft power, which can be used as a high-efficiency gear selection point for a defined flow. That is, in step S5 of this embodiment, an optimized rear axle power curve may be obtained through CFD numerical simulation analysis, so as to obtain an optimized rear fan efficient flow parameter.

The optimal design method is particularly suitable for fan equipment with multi-gear adjustment of air output, shaft power optimization can be realized by adjusting flow parameters, and power consumption is further effectively reduced.

Meanwhile, according to tables 2 and 3, the performance curves shown in fig. 7 were plotted:

1. under the condition of 920rpm, the model 'new' P-Q curve is integrally superior to the original fan, mainly embodied in that the 'inflection point' area of the fan is obviously superior to the original fan;

2. the single fan efficiency of the new fan is obviously superior to that of the original fan, and is higher by about 2-4% under the same air quantity; meanwhile, the backward movement of the position of the air output point with optimal efficiency is realized, and the highest efficiency of the fan is 12500m³And in the area near the/h, the air outlet amount reaches about 80 percent, and the synchronous improvement of the air outlet amount and the efficiency is realized.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (4)

1. A high-efficiency fan comprises a central rotor and fan blades arranged on the central rotor, wherein one side surface of each fan blade facing to an air outlet direction is a pressure surface; the method is characterized in that:

the pressure surface intercepted by the concentric cylindrical curved surface of the concentric core of the central rotor is an intersecting curve, and the plane expansion line of the intersecting curve is a blade-shaped curve;

there are a plurality of such airfoil curves as circular arcs.

2. The high efficiency fan of claim 1, wherein: along the radial direction of the fan blades, the blade profile curves are distributed uniformly at equal intervals by the intersecting curves of the arc lines.

3. The high efficiency fan of claim 1, wherein: the adjacent leaf-shaped curves are two intersecting curves of circular arc lines and are connected by a smooth curved surface.

4. The high efficiency fan of claim 1, wherein: the blade-shaped curve is convex outward in the direction of the fan airflow.

Images