CN103115021B - Vane wheel device - Google Patents

Abstract

The utility model relates to an impeller device, which belongs to a component part of a fan, and solves the problems of low efficiency, high noise and many consumables of the existing fan impeller device. The invention includes a hub and a plurality of blades evenly distributed on the hub. The hub is composed of front and rear hub disks. The blades are composed of an integrated petiole and blade body. The airfoil of the blade body adopts C4 airfoil, and the center of gravity of the blade body is stacked The line is a three-dimensional curve in space; there are evenly distributed petiole front grooves along the outer circumference of the front hub disk, and there are petiole rear grooves corresponding to the positions of the petiole front grooves along the rear hub disk outer circumference. The front and rear hub disks are connected by bolts to connect the blades The petiole is confined within it. The invention is simple in structure, easy to produce, easy to install, can adjust the size of blade installation angle according to working conditions, has large air volume, high wind pressure, high efficiency, low noise, and can be widely used in ventilation and replacement of various workshops, warehouses and buildings. air system and other industrial air supply and induced air systems.

Description

an impeller device

technical field

The invention belongs to components of a fan, in particular to an impeller device of a fan.

Background technique

At present, most of the fan impellers used in the ventilation systems of factories, warehouses and buildings, as well as other industrial air supply and induction systems are designed using traditional design methods, which have low efficiency, high noise, and high consumption of materials. The waste is large, which is not conducive to energy saving and emission reduction.

In addition, the curved-swept blade technology has been widely used in aviation engines and high-pressure ratio axial flow compressors. It has been proved by experiments that this technology has the characteristics of reducing noise and improving the mechanical performance of the impeller. Applying this technology to industrial and civil fans to develop a new type of high-efficiency and low-noise general-purpose fan impeller has great application value.

Therefore, combined with the above background factors, the development of an impeller with simple structure, wide range of adaptability to working conditions, low consumables, high efficiency and low noise is in line with the general direction of the country's energy saving and emission reduction.

The present invention adopts a space Cartesian coordinate system, O is the origin, the X axis is horizontal to the right, the Z axis is vertical upward, and the Y axis is vertical to the outside of the paper. The projection of the spatial curve on the ZOX plane is a circumferential projection, and the spatial curve is on the ZOY plane. The projection of is an axial projection.

Contents of the invention

The invention provides an impeller device, which solves the problems of low efficiency, high noise and many consumables of the existing fan.

An impeller device provided by the present invention includes a hub and a plurality of blades evenly distributed on the hub, the hub is composed of a front hub disc and a rear hub disc, and is characterized in that:

The blade is composed of an integral petiole and a blade body, the petiole is a cylinder with a flange; the airfoil of the blade body adopts a C4 airfoil, and the center of gravity stacking line of the blade body is a three-dimensional curve in space, and its circumferential direction The projection is an arc, the ratio of the radius of the arc to the radius of the impeller is 1.38~1.5, the arc is bent forward, and the sweep angle is 15°~20°;

The axial projection of the stacking line of the center of gravity is formed by the tangent of the large forward curved arc and the small backward curved arc, the tangent point is at the blade height of 0.9-0.95, and the ratio of the radius of the large forward curved arc to the radius of the impeller is 1.90 ～1.95, the forward bending angle of the large arc is 8°～10°, and the ratio of the radius of the small backward arc to the radius of the impeller is 0.08～0.12;

The shape of the front hub disc is a disc, which has evenly distributed petiole front grooves along its outer circumference, the surface of the disc has evenly distributed counterbore holes for bolts close to the outer circumference, and the center of the disc has a raised connection, and the connecting shaft has an axial The central through hole is used to connect with the motor;

The shape of the rear hub disc is also a disc, and there is a petiole rear groove corresponding to the position of the petiole front groove along its outer circumference. The disc center has a shaft hole matched with the connecting shaft;

The front hub disc and the rear hub disc are connected by bolts, each petiole front groove and corresponding petiole rear groove form a petiole groove, and the petiole of the blade is limited therein.

The impeller device is characterized in that:

The ratio of the radius of the arc to the radius of the impeller is 1.45 to 1.48, the curvature of the arc is forward sweep, and the sweep angle is 15° to 18°;

The tangent point between the large forward curved arc and the small backward curved arc is at the blade height of 0.91 to 0.93, the ratio of the radius of the large forward curved arc to the radius of the impeller is 1.92 to 1.94, and the forward bending angle of the large forward curved arc is 9 °～10°, the ratio of the radius of the small back-curved arc to the radius of the impeller is 0.09～0.11.

The processing and forming method of the present invention may comprise the following steps:

(1) Use 3D software to generate the blade body according to the blade design drawing, according to the airfoil and center of gravity stacking line, assemble the petiole, and form a 3D model of the blade;

(2) Use 3D software to draw a 3D model of the front and rear hubs according to the design drawings of the front and rear hubs;

(3) Select copper blocks or other metal materials as processing materials, input the three-dimensional model of the blade and the three-dimensional model of the front and rear hubs into the CNC lathe, and generate solid blades, front hubs, and rear hubs;

(4) take the solid blade generated in step (3), the front hub disc, the rear hub disc as the model opening mold, make the mold of blade, front hub disc, rear hub disc;

(5) Use aluminum alloy casting blades, front hub discs, and rear hub disc molds to achieve mass production.

Assembly process of the present invention is as follows:

(1) Wedge the petioles of the blades into the front groove of the petiole of the front hub;

(2) Overlap the rear hub disc with the front hub disc, the petiole rear groove of the rear hub disc corresponds to the petiole front groove of the front hub disc, and the shaft hole of the rear hub disc corresponds to the shaft of the front hub disc;

(3) Put the bolts and nuts into the corresponding bolt counterbore and nut counterbore, and tighten the bolts to fix the impeller blades.

After the assembled impeller, the blade installation angle can be adjusted through the following steps:

(1) According to the needs of working conditions, calculate the installation angle of the blade;

(2) Loosen the bolts and nuts on the hub; reduce the pressing force of the front and rear hub discs on the blade handle;

(3) Loosen the blade and turn the blade until the blade installation angle calculated in step (1) is reached;

(4) Tighten the bolts and nuts on the hub; increase the pressing force of the front and rear hub discs on the blade handle, and fix the blade.

The blade of the invention is an airfoil-shaped curved blade, which greatly improves the aerodynamic performance and noise performance of the fan; the outer contour of the hub adopts a spherical cutting method, and the inside of the hub can be hollowed out, which reduces material loss and facilitates molding. The entire impeller device has a simple structure, which is convenient for production and easy installation. The installation angle of the blades can be adjusted according to the working conditions. The air volume is large, the wind pressure is high, and the efficiency is high, and the noise is low. It can be widely used in the ventilation of various factories, warehouses and buildings. Ventilation systems and other industrial air supply and induction systems.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is a side view of the present invention;

Figure 3 is an oblique axonometric view of the blade;

Fig. 4 (A) is the projection diagram of the circumferential surface of the blade generating accumulation line;

Fig. 4 (B) is the projection diagram of the axial plane of the blade generation stacking line;

Fig. 5 (A) is the front view of front hub disc;

Fig. 5 (B) is the side sectional view of front hub disc;

Fig. 6 (A) is the front view of rear hub disc;

Fig. 6 (B) is the side sectional view of rear hub disc;

Fig. 7 is a schematic diagram of the impeller device of the present invention installed in the working condition of the fan;

Fig. 8 is an experimental performance curve diagram of embodiment 2 of the present invention installed in a fan;

Fig. 9 is an experimental performance curve diagram of embodiment 3 of the present invention installed in a fan.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in FIG. 1 and FIG. 2 , the present invention includes a hub and a plurality of blades 1 evenly distributed on the hub, and the hub is composed of a front hub disc 2 and a rear hub disc 3 .

As shown in Figure 3, the blade 1 is composed of an integral petiole 10 and a blade body 11, and the petiole 10 is a cylinder with a flange;

As shown in Figure 4(A) and Figure 4(B), the space plane XOZ plane is taken, which is defined as the plane (circumferential plane) where the impeller rotation direction is located, where the OZ direction is the blade height direction, and the OX direction is the rotation direction; The spatial plane YOZ plane is defined as the plane (axial plane) where the airflow direction is located, where the OZ direction is the blade height direction, and the OY direction is the airflow direction. The airfoil 11-1 of the blade body 11 adopts a C4 airfoil, and the center of gravity stacking line of the blade body 11 is a three-dimensional curve in space, and its circumferential projection is an arc 11-2, and the radius of the arc 11-2 is equal to the radius of the impeller. The ratio is 1.38~1.5, the arc 11-2 is bent forward, and the forward sweep angle is 15°~20°;

The axial projection of the stacking line of the center of gravity is formed by the tangent of the large forward-curved arc 11-3 and the small backward-curved arc 11-4, the tangent point is at the leaf height of 0.92 (0.9-0.95), The ratio of the radius of the arc 11-3 to the radius of the impeller is 1.90 to 1.95, the forward bending angle of the large arc is 8° to 12°, and the ratio of the radius of the small backward arc 11-4 to the radius of the impeller is 0.08 to 0.12;

When the blade body is generated, the airfoil is stacked along the three-dimensional stacking line synthesized in Figure 4(A) and Figure 4(B), and the stacking center is at the chord length of the airfoil at 0.4. The airfoil camber and airfoil chord are designed according to the design method of the reference book "Ventilator" Li Qingyi, Mechanical Industry Press, 1981ISBN7111003470, P144-172.

As shown in Fig. 5 (A) and Fig. 5 (B), the shape of the front hub disc 2 is a disc, which has evenly distributed petiole front grooves 6 along its outer circumference, and has evenly distributed bolts on the disc surface close to the outer circumference. Counterbore 8, the disc center has a raised connecting shaft 4, and the connecting shaft 4 has an axial center through hole for connecting with the motor;

As shown in Fig. 6 (A) and Fig. 6 (B), the profile of the rear hub disc 3 is also a disk, and there is a petiole rear groove 7 corresponding to the position of the petiole front groove 6 along its outer circumference. There is a nut counterbore 9 corresponding to the position of the bolt counterbore 8 close to the outer circumference, and the center of the disk has a shaft hole 5 matched with the connecting shaft 4;

The front hub disk 2 and the rear hub disk 3 are connected by bolts, each petiole front groove 6 and corresponding petiole rear groove 7 form a petiole groove, and the petiole 10 of the blade 1 is restricted therein.

The impeller device consists of a plurality of sweeping blades 1, a spherical front hub disc 2, a spherical rear hub disc 3, and several connecting bolts and nuts. The connecting bolts and nuts are connected through bolt counterbores 8 and nut counterbores 9.

The spherical front hub disc 2 and the spherical rear hub disc 3 cooperate with the rear hub disc hole 5 through the front hub disc shaft 4 to form the impeller hub together.

The petiole 10 of the blade 1 fits with the petiole front groove 6 of the front hub 2 and the petiole rear groove 7 of the rear hub 3, and is connected by bolts between the bolt counterbore 8 and the nut counterbore 9 to compress the front and rear hubs. Disks 2 and 3 are fixed.

Embodiment 1: The diameter of the impeller is 700mm, the hub ratio is 0.3, as shown in Figure 4 (B), the blade height is 243mm, and the stacking line on the circumferential surface has a radius of 512mm (ratio to the outer diameter of the impeller is 1.46). The arc is bent forward at an angle of 15°; on the circumferential surface, from the root of the blade to the blade height of 0.92 (223mm), a circular arc with a radius of 675mm (1.93 to the outer diameter of the impeller) is used, and an angle of 10° is swept forward. From the blade height of 0.92 (223mm) to the tip of the blade, a swept back arc with a radius of 35mm (the ratio to the outer diameter of the impeller is 0.1) is adopted.

Embodiment 2: The diameter of the impeller is 500 mm, the hub ratio is 0.3, and the blade height is 175 mm. The overlapping line on the circumferential surface adopts a circular arc with a radius of 345 mm (the ratio to the outer diameter of the impeller is 1.38), and an angle of 18° is bent forward; On the circumferential surface, from the root of the blade to the height of 0.9 blades (158mm), a circular arc with a radius of 475mm (ratio to the outer diameter of the impeller is 1.9), swept forward at an angle of 12°, from the height of 0.9 blades (158mm) to the top of the blade A swept-back arc with a radius of 30mm (ratio to the outer diameter of the impeller is 0.12) is used.

Embodiment 3: The diameter of the impeller is 910mm, the hub ratio is 0.27, and the blade height is 664mm. The overlapping line on the circumferential surface adopts a circular arc with a radius of 682mm (the ratio to the outer diameter of the impeller is 1.5), and the forward bend angle is 20°; On the circumferential surface, from the root of the blade to the blade height of 0.95 (630mm), a circular arc with a radius of 887mm (the ratio of the outer diameter of the impeller is 1.95), swept forward at an angle of 10°, from the blade height of 0.95 (630mm) to the blade top At the position, a swept-back arc with a radius of 36.5mm (ratio to the outer diameter of the impeller is 0.08) is used.

Embodiment 4: The diameter of the impeller is 600mm, the hub ratio is 0.3, and the blade height is 210mm. The overlapping line on the circumferential surface adopts a circular arc with a radius of 435mm (the ratio to the outer diameter of the impeller is 1.45), and an angle of 18° is bent forward; On the circumferential surface, from the root of the blade to the height of 0.91 (191mm), a circular arc with a radius of 582mm (1.94 to the outer diameter of the impeller) is used, with a forward sweep of 10°, from the height of 0.91 (191mm) to the top of the blade At the position, a swept-back arc with a radius of 33mm (ratio to the outer diameter of the impeller is 0.11) is used.

Embodiment 5: The diameter of the impeller is 630mm, the hub ratio is 0.32, and the blade height is 215mm. The stacking line on the circumferential surface adopts a circular arc with a radius of 466mm (the ratio to the outer diameter of the impeller is 1.48), and the forward bending angle is 15°; On the circumferential surface, from the root of the blade to the blade height of 0.93 (200mm), a circular arc with a radius of 605mm (the ratio to the outer diameter of the impeller is 1.92) is used, and the angle is swept forward at 9°, from the blade height of 0.93 (200mm) to the blade top. At the position, a swept-back arc with a radius of 28.35mm (ratio to the outer diameter of the impeller is 0.09) is used.

The installation and operation of the present invention are shown in FIG. 7 , the motor 17 is supported and fixed in the fan casing 15 by the motor bracket 19 , and the impeller device 16 of the present invention is connected with the motor 17 through the motor shaft 18 . During operation, the motor 17 is connected to the power supply to run, and the impeller device 16 is driven to rotate by the motor shaft 18 to perform work. According to different working conditions, the installation angle of the impeller 16 blades can be adjusted to meet the requirements of working conditions.

FIG. 8 is an experimental performance curve of a fan using Example 2.

FIG. 9 is an experimental performance curve of a fan using Example 3.

In Fig. 8 and Fig. 9, LA is the noise level, the unit is db; P is the pressure, the unit is Pa, Pt represents the total pressure, Ps represents the static pressure; N represents the fan power, the unit is kw; ηr is the efficiency, the unit is % .

It can be seen from Figure 8 and Figure 9 that the efficiency of the two fans far exceeds the efficiency index of the same national standard, and the noise is 3-6 dB lower than that of the same fan.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (2)

1. An impeller device, comprising a hub and a plurality of blades (1) evenly distributed on the hub, the blades (1) are made of an integrated petiole (10) and a blade body (11), and the hub consists of a front hub Disc (2) and rear hub disc (3), the shape of the front hub disc (2) and rear hub disc (3) is a disc, with evenly distributed petiole front grooves along the outer circumference of the front hub disc (2). 6), there is a petiole rear groove (7) corresponding to the position of the petiole front groove (6) along the outer circumference of the rear hub disk (3), and the front hub disk (2) and the rear hub disk (3) are connected by bolts connected to form a complete hub, each petiole front groove (6) and the corresponding petiole rear groove (7) form a petiole groove, and the petiole (10) of the blade (1) is limited therein; it is characterized in that: The petiole (10) is a cylinder with a flange; the airfoil (11-1) of the blade body (11) adopts a C4 airfoil, and the center of gravity stacking line of the blade body (11) is a three-dimensional curve in space. The circumferential projection is an arc (11-2), the ratio of the radius of the arc (11-2) to the radius of the impeller is 1.38~1.5, the curvature of the arc (11-2) is forward sweep, and the sweep angle is 15°~ 20°; The axial projection of the stacking line of the center of gravity is formed by the tangent of the large forward curved arc (11-3) and the small backward curved arc (11-4). The ratio of the radius of the arc (11-3) to the radius of the impeller is 1.90 to 1.95, the forward bending angle of the large arc (11-3) is 8° to 10°, and the radius of the small arc (11-4) is the same as The ratio of impeller radius is 0.08～0.12; The disc surface of the front hub disc (2) has evenly distributed bolt counterbores (8) close to the outer circumference, the center of the disc has a raised connecting shaft (4), and the connecting shaft (4) has an axial center through hole, Used to connect with the motor; The disc surface of the rear hub disc (3) has a nut counterbore (9) corresponding to the position of the bolt counterbore (8) close to the outer circumference, and the center of the disc has a shaft matched with the connecting shaft (4). hole (5). 2. The impeller device according to claim 1, characterized in that: The ratio of the radius of the arc (11-2) to the radius of the impeller is 1.45-1.48, the arc (11-2) is bent forward, and the sweep angle is 15°-18°; The point of tangency between the large forward curved arc (11-3) and the small backward curved arc (11-4) is at the blade height of 0.91-0.93, and the ratio of the radius of the large forward curved arc (11-3) to the radius of the impeller is 1.92-1.94, the forward bending angle of the large forward-bending arc (11-3) is 8°-10°, and the ratio of the radius of the backward-bending small arc (11-4) to the radius of the impeller is 0.09-0.11.