CN211715409U - Structure of volute wind wheel air duct system - Google Patents

Abstract

The utility model discloses a structure of spiral case wind wheel air duct system, adopt preceding centrifugal wind wheel, Archimedes spiral wind channel, use the wind wheel center to establish cartesian rectangular coordinate system as the initial point, the coordinate of the A point on its wind channel curve is (107.6 + -3.5, 29.3 + -3.5), the coordinate of B point is (84.5 + -3.5, 83.3 + -3.5), the coordinate of C point is (-88.1 + -3.5, 93.5 + -3.5), the coordinate of D point is (-132.5 + -3.5, 0 + -3.5), the coordinate of E point is (-98.8 + -3.5, -99.0 + -3.5), the coordinate of F point is (113.6 + -3.5, -113.4 + -3.5). The utility model discloses a wind channel curve, in the wind wheel air duct system of the big wind pressure of big amount of wind, the resistance that can furthest reduce the wind channel and produce has the energy loss that can reduce the backward flow and bring simultaneously.

Description

Structure of volute wind wheel air duct system

Technical Field

The utility model relates to a wind wheel ducting system field especially indicates a spiral case wind wheel ducting system's structure.

Background

The conventional volute air duct curve is mainly an Archimedes spiral, and the airflow potential energy is collected through an Archimedes spiral air duct. The track parameters of the Archimedes spiral greatly affect the performance of the wind wheel air duct system, and unreasonable design parameters of the Archimedes spiral can cause the problems of overlarge load, abnormal sound or insufficient wind pressure, backflow, airflow self-circulation and the like, and the problems are particularly obvious on the wind wheel air duct system with large wind volume and large wind pressure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a spiral case wind wheel duct system's structure to the wind wheel duct system of the big amount of wind, can furthest reduce the resistance that the wind channel produced, has the energy loss that can reduce the backward flow and bring simultaneously.

In order to achieve the above purpose, the solution of the present invention is:

a structure of a volute wind wheel air duct system adopts a forward centrifugal wind wheel and an Archimedes spiral air duct, a Cartesian rectangular coordinate system is established by taking the center of the wind wheel as an origin, the coordinates of the point A on an air duct curve are (107.6 +/-3.5, 29.3 +/-3.5), the coordinates of the point B are (84.5 +/-3.5, 83.3 +/-3.5), the coordinates of the point C are (-88.1 +/-3.5, 93.5 +/-3.5), the coordinates of the point D are (-132.5 +/-3.5, 0 +/-3.5), the coordinates of the point E are (-98.8 +/-3.5, -99.0 +/-3.5), the coordinates of the point F are (113.6 +/-3.5, -113.4 +/-3.5), wherein the coordinate values of the points are in mm, the point A is the intersection point of a dotted line passing through the origin and an included angle of an X axis and an inner wall surface of the air duct curve, the point B is the intersection point of an included angle of 45 degrees between the origin and an inner wall surface of the air duct curve, and the point Y is a point through the origin, the point D is the intersection point of a dotted line which passes through the original point and has an included angle of 90 degrees with the axis Y and a curve of the inner wall surface of the air duct, the point E is the intersection point of a dotted line which passes through the original point and has an included angle of-135 degrees with the axis X and a curve of the inner wall surface of the air duct, and the point F is the intersection point of a dotted line which passes through the original point and has an included angle of-45 degrees with the axis X.

The radius of the volute tongue of the air duct curve is 14.0 +/-2.0 mm.

In the volute wind wheel air duct system, the diameter of a wind wheel is 192mm, the value range of the wind inlet angle of the wind wheel is 90 degrees +/-5 degrees, the value range of the wind outlet angle of the wind wheel is 45 degrees +/-5 degrees, the wind inlet angle of the wind wheel is the included angle between the tangent point of the inner edge tangent line and the circle center connecting line of the wind wheel, and the wind outlet angle of the wind wheel is the included angle between the tangent point of the outer edge tangent line and the outer aid tangent line and the circle center connecting line of the wind wheel.

After the technical scheme is adopted, the utility model discloses a wind channel curve, in the wind wheel duct system of the big wind pressure of big amount of wind, the resistance that can furthest reduce the wind channel and produce has the energy loss that can reduce the backward flow and bring simultaneously.

Furthermore, the utility model discloses the pneumatic performance of wind wheel can be promoted to the angle of setting for of the angle of wind and the angle of wind that advances of wind wheel, realizes under the low rotational speed state, the output of the high amount of wind of high power.

Drawings

FIG. 1 is a schematic view of a spiral duct according to an embodiment of the present invention;

FIG. 2 is a schematic view of the design of the blade profile of the centrifugal fan blade according to the embodiment of the present invention;

fig. 3 is a schematic structural view of a wind wheel duct system according to an embodiment of the present invention;

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.

Design method of volute wind wheel air duct system, aiming at air quantity greater than 80m³The wind wheel air duct system comprises a volute air duct design:

design air quantity Q according to theory_nCalculating the opening degree of the volute air duct

Wherein B is the height of the volute and C_vThe value range is 16-17m/s for theoretical wind speed;

as shown in fig. 1, the center of the impeller is taken as the center of a circle, and the side length a is gamma/6 to form a regular hexagon; the angles of 6 vertexes of the regular hexagon are taken as starting points and are respectively 100 degrees with 6 edges of the regular hexagonWith R₁、R₂、R₃、R₄、R₅、R₆Drawing 6 line segments for length, wherein R₁＝R_{Wind wheel}+₁·a，₁＝1.2±0.3，R₂＝R_{Wind wheel}+₂·a，₂＝3.0±0.3，R₃＝R_{Wind wheel}+₃·a，₃＝3.2±0.3，R₄＝R_{Wind wheel}+₄·a，₄＝4.6±0.3，R₅＝R_{Wind wheel}+₅·a，₅＝5.9±0.3，R₆＝R_{Wind wheel}+₆·a，₆7.8 plus or minus 0.3; the inner wall surface of the volute curve is formed by drawing a spline curve from the end points (points A, B, C, D, E, F in the figure) of the 6 line segments.

The above is the coefficient of extension, which is the coefficient at the minimum size of the duct at a sound pressure level of 52 dB.

The volute curve designed by the method is characterized in that the curve section formed by the wind pressure is formed from the point A to the point B, the expansion coefficient is obviously increased, the wind pressure is stable from the point B to the point C, the change of the expansion coefficient is not large, the expansion coefficient is stably increased from the point C to the point E, the loss of kinetic energy is reduced, the wind speed is the largest at the point E to the point F, the expansion coefficient is increased, the kinetic energy is converted into pressure energy, and the energy loss is reduced. According to the difference of the wind pressure state, a sectional design is carried out, which is the biggest difference with the conventional design method. Experiments prove that the air quantity is 130m³In the wind wheel air duct system of/h, the volute air duct designed by the method can reduce the output power of 2-3w and can improve the competitiveness of the product energy efficiency value; on the premise of the same output power, the realized air volume is larger. The obtained effect is that the minimum energy loss is realized, the load of the motor is reduced, and the maximum performance can be realized under the same power. The experimental data are as follows:

the method also comprises the design of the centrifugal fan blade profile:

the pneumatic equation of the centrifugal fan blade is P ═ omega²·ρ·q_v(cos²α₂·r₂-cos²α₁·r₁) Where P is the output power, ω is the rotational speed, ρ is the air density, q_vFlow rate, alpha, generated for the fan blades₂Is the outlet angle, alpha₁Is an air inlet angle r₂Is the outer diameter of the fan blade, r₁The inner diameter of the fan blade is shown in fig. 2. The design of the blade profile of the centrifugal fan blade can realize low rotating speed, high wind pressure and high power output.

From the pneumatic equation, cos can be obtained²α₁·r₁When zero, the maximum power can be output, so the wind inlet angle alpha₁A large power can be output in the range of 84-90 deg.. According to the analysis data of CFD, the air outlet angle alpha₂The pneumatic performance is best when the value range is 42-50 degrees.

The method can obtain the structure of the volute wind wheel air duct system shown in figure 3, a cartesian rectangular coordinate system is established by taking the center of the wind wheel as an original point by adopting the forward centrifugal wind wheel and the Archimedes spiral air duct, the coordinates of the point A on the air duct curve are (107.6 +/-3.5, 29.3 +/-3.5), the coordinates of the point B are (84.5 +/-3.5, 83.3 +/-3.5), the coordinates of the point C are (-88.1 +/-3.5, 93.5 +/-3.5), the coordinates of the point D are (-132.5 +/-3.5, 0 +/-3.5), the coordinates of the point E are (-98.8 +/-3.5, -99.0 +/-3.5), the coordinates of the point F are (113.6 +/-3.5, -113.4 +/-3.5), wherein the coordinate values of the points are in mm, the point A is the intersection point of an included angle between a dotted line passing through the original point and the X axis and an inner wall surface of the air duct curve, and the point B is a 45 degrees, the point C is the intersection point of a dotted line with an included angle of 45 degrees between the original point and the Y axis and a curve of the inner wall surface of the air duct, the point D is the intersection point of a dotted line with an included angle of 90 degrees between the original point and the Y axis and a curve of the inner wall surface of the air duct, the point E is the intersection point of a dotted line with an included angle of-135 degrees between the original point and the X axis and a curve of the inner wall surface of the air duct, and the point F is the intersection point of a dotted line with an included angle of-45 degrees. The design of the air duct curve is at the critical value of backflow, so that the design has the advantages that the resistance generated by the air duct can be reduced to the maximum extent, and meanwhile, the energy loss caused by backflow can be reduced.

The radius of the volute tongue of the air duct curve is 14.0 +/-2.0 mm. The radius of the volute tongue should not be too large or too small: the wind speed at the volute tongue part is high, and the wind pressure is reduced due to the fact that the radius value of the volute tongue is too large, so that the wind quantity is too small; too small a radius of the volute tongue causes sharp aerodynamic noise.

Referring to fig. 2, in the volute wind wheel air duct system, the diameter of the wind wheel is 192mm, the value range of the wind inlet angle of the wind wheel is 90 ° ± 5 °, and the value range of the wind outlet angle of the wind wheel is 45 ° ± 5 °, wherein the wind inlet angle of the wind wheel is an included angle between a tangent point of an inner edge tangent line and a circle center connecting line of the wind wheel, and the wind outlet angle of the wind wheel is an included angle between a tangent point of an outer edge tangent line and a circle center connecting line of the wind wheel.

Through the scheme, the utility model discloses a wind channel curve, in the wind wheel air duct system of the big wind pressure of big amount of wind, the resistance that can furthest reduce the wind channel and produce has the energy loss that can reduce the backward flow and bring simultaneously.

Furthermore, the utility model discloses the pneumatic performance of wind wheel can be promoted to the angle of setting for of the angle of wind and the angle of wind that advances of wind wheel, realizes under the low rotational speed state, the output of the high amount of wind of high power.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications made by those skilled in the art should not be construed as departing from the scope of the present invention.

Claims (3)

1. The utility model provides a structure of spiral case wind wheel air duct system which characterized in that:

a forward centrifugal wind wheel and an Archimedes spiral wind channel are adopted, a Cartesian rectangular coordinate system is established by taking the center of the wind wheel as an original point, the coordinates of the point A on the wind channel curve are (107.6 +/-3.5, 29.3 +/-3.5), the coordinates of the point B are (84.5 +/-3.5, 83.3 +/-3.5), the coordinates of the point C are (-88.1 +/-3.5, 93.5 +/-3.5), the coordinates of the point D are (-132.5 +/-3.5, 0 +/-3.5), the coordinates of the point E are (-98.8 +/-3.5, -99.0 +/-3.5), the coordinates of the point F are (113.6 +/-3.5, -113.4 +/-3.5), wherein the coordinate value unit of each point is mm, the point A is the intersection point of a dotted line passing through the original point and an X-axis included angle of 15 degrees and the wind channel and an inner wall surface curve, the point B is the intersection point of a dotted line passing through the original point and an X-axis included angle of 45 degrees, and the wind channel and the point C is the intersection point of a Y-axis-passing through the original point, the point D is the intersection point of a dotted line which passes through the original point and has an included angle of 90 degrees with the axis Y and a curve of the inner wall surface of the air duct, the point E is the intersection point of a dotted line which passes through the original point and has an included angle of-135 degrees with the axis X and a curve of the inner wall surface of the air duct, and the point F is the intersection point of a dotted line which passes through the original point and has an included angle of-45 degrees with the axis X.

2. The structure of a volute wind wheel duct system of claim 1, wherein:

the radius of the volute tongue of the air duct curve is 14.0 +/-2.0 mm.

3. The structure of a volute wind wheel duct system of claim 1, wherein:

in the volute wind wheel air duct system, the diameter of a wind wheel is 192mm, the value range of the wind inlet angle of the wind wheel is 90 degrees +/-5 degrees, the value range of the wind outlet angle of the wind wheel is 45 degrees +/-5 degrees, the wind inlet angle of the wind wheel is the included angle between the tangent point of the inner edge tangent line and the circle center connecting line of the wind wheel, and the wind outlet angle of the wind wheel is the included angle between the tangent point of the outer edge tangent line and the outer aid tangent line and the circle center connecting line of the wind wheel.

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