CN214170939U

CN214170939U - Double-helix centrifugal fan impeller

Info

Publication number: CN214170939U
Application number: CN202023207591.XU
Authority: CN
Inventors: 应友春; 林刚
Original assignee: Zhejiang Xingyi Ventilator Electrical Appliance Co ltd
Current assignee: Zhejiang Xingyi Ventilator Electrical Appliance Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-09-10
Anticipated expiration: 2030-12-28

Abstract

The utility model provides a double helix centrifugal fan impeller belongs to fluid machinery technical field. The impeller solves the problems that the structure of the blades in the existing impeller is linear or arc-shaped streamline, and the contact area between the blades and a medium is small under the condition that the diameter and the thickness of the impeller are the same. This double helix centrifugal fan impeller, including rim plate, wheel cap, reel and a plurality of blade, the blade slope sets up and the even circumference in interval is arranged and is fixed in the rim plate internal surface, and the blade is double-deck curved surface structure through end to end fixed molding, and the inside of blade is the cavity structure. The utility model has the advantages of the wind pressure flow all can be effectively improved under the condition with power.

Description

Double-helix centrifugal fan impeller

Technical Field

The utility model belongs to the technical field of fluid machinery, a impeller, in particular to double helix centrifugal fan impeller is related to.

Background

The centrifugal fan accelerates gas by utilizing an impeller rotating at a high speed, the application in the industry is very wide, in the prior art, the structure of blades inside the impeller is linear or arc streamline, the contact area between the blades and a medium is small under the condition that the diameter and the thickness of the impeller are the same, the energy loss is large in the conversion process, and the problems of low pressure, insufficient air volume and low motor efficiency exist, so that the structural shape of the blades is improved to promote the overall efficiency, and the energy-saving effect is the current main research and development direction.

Disclosure of Invention

The utility model aims at the above-mentioned problem that exists among the prior art, provide a two spiral centrifugal fan impeller that the wind pressure flow all can effectively be improved under the condition with power.

The purpose of the utility model can be realized by the following technical proposal: the double-helix centrifugal fan impeller comprises a wheel disc, a wheel cover, a shaft disc and a plurality of blades, and is characterized in that the blades are obliquely arranged and are circumferentially arranged and fixed on the inner surface of the wheel disc at uniform intervals, the blades are of a double-layer curved surface structure and are fixedly formed by end-to-end connection, the inner parts of the blades are of a cavity structure, the included angle formed between the two end points of the blades and the center of the wheel disc is 42-48 degrees, the two surfaces of the blades comprise A, B, C, D, E, F transition fillets, wherein the range of the central connecting line of the transition fillets A and B relative to the horizontal included angle alpha is 12-16 degrees, the range of the central connecting line of the transition fillets C and D relative to the horizontal included angle beta is 10-14 degrees, and the range of the central connecting line of the transition fillets E and F relative to the horizontal included angle gamma is 30-36 degrees.

In the double-helix centrifugal fan impeller, the central connecting line of the transition fillets A and B forms an included angle alpha of 14 degrees relative to the horizontal.

In the double-helix centrifugal fan impeller, the central connecting line of the transition fillets C and D forms an included angle beta of 12 degrees with respect to the horizontal direction.

In the double-helix centrifugal fan impeller, the central connecting line of the transition fillets E and F forms an included angle gamma of 33 degrees relative to the horizontal plane.

In the double-helix centrifugal fan impeller, two ends of the blade are fixed by welding, and the contact surfaces of the blade, the wheel disc and the wheel cover are fixed by welding.

In the double-helix centrifugal fan impeller, the shaft disc is fixed at the center of the wheel disc through the flange surface by screws.

In the double-helix centrifugal fan impeller, the thickness of the wheel disc is larger than that of the wheel cover.

In the above-described double-helix centrifugal fan impeller, the number of the blades is 8.

The utility model also provides a centrifugal fan, including motor, spiral case and impeller, this impeller is above-mentioned double helix centrifugal fan impeller.

A method of manufacturing an impeller comprising the steps of:

1. placing two surfaces of the blade into a clamp matched with the structure of the blade, and connecting and fixing contact points at two end parts by welding;

2. each blade is placed on the surface of the wheel disc at the same interval and at the same inclination angle, and then the contact surfaces of the blades and the wheel disc are fixed by welding;

3. and placing a wheel cover on the blade, and fixing the wheel cover and the blade by adopting a forge welding process so as to finish the integral molding of the impeller.

Compared with the prior art, the double-helix centrifugal fan impeller has the advantages that the traditional linear or streamline blades are designed into a double-curved-surface structure, the contact area between the blades and a medium is increased, the weight is reduced by matching with the internal cavity structure of the blades, the total pressure is increased by 20% and the flow is increased by 10% under the same power, and the energy can be saved by 15% under the same working condition.

Drawings

FIG. 1 is a schematic view of the internal structure of the present impeller;

FIG. 2 is a schematic view of the overall construction of the present impeller;

FIG. 3 is a side sectional view of the present impeller;

in the figure, 1, a wheel disc; 2. a wheel cover; 3. a reel; 4. a blade.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, fig. 2 and fig. 3, the double helix centrifugal fan impeller comprises an impeller disc 1, an impeller cover 2, an impeller disc 3 and a plurality of blades 4, wherein the blades 4 are obliquely arranged and are circumferentially arranged at uniform intervals and fixed on the inner surface of the impeller disc 1, the blades 4 are of a double-layer curved surface structure and are fixedly formed by end-to-end connection, the inner part of each blade 4 is of a cavity structure, two surfaces of each blade 4 comprise A, B, C, D, E, F transition fillets, the range of the central connecting line of the transition fillets A and B relative to a horizontal included angle alpha is 12-16 degrees, the range of the central connecting line of the transition fillets C and D relative to a horizontal included angle beta is 10-14 degrees, and the range of the central connecting line of the transition fillets E and F relative to the horizontal included angle gamma is 30-35 degrees.

Specifically, the principle is that gas enters axially from the opening at the center of the wheel cover 2, is accelerated by the blades 4 and then is thrown to the volute, the gas flow is gathered by the volute and is discharged from the outlet, the point E and the point B perform secondary pressurization on the conveying medium after the impeller of the fan rotates, so that the medium obtains larger kinetic energy, and the included angle formed between the two end points of the blades 4 and the center of the wheel disc 1 is 45 degrees, and if the included angle is larger than 45 degrees, the pressure is increased and the flow is reduced. When the pressure is less than 45 degrees, the pressure is reduced, the flow is increased, and after experimental tests, the temperature of 42 degrees to 48 degrees is determined to be the optimal interval of the fan efficiency. The connecting lines between the transition fillets are smooth planes due to the attack angle of the air flow as it travels around the blades 4.

Specifically referring to fig. 1, the connection line between the point a and the point B has an angle α of 14 ° with respect to the horizontal, if the angle is greater than 14 °, the pressure of the fan is reduced, and if the angle is less than 14 °, the energy consumption of the fan is increased, the efficiency is reduced, and the angle of 12 ° to 16 ° is the optimum pressure range as tested.

And the included angle beta between the connecting line of the point C and the point D relative to the horizontal is 12 degrees, if the included angle is larger than 12 degrees, the flow of the fan is reduced, if the included angle is smaller than 12 degrees, the pressure of the fan is reduced, and the tested value is 10-14 degrees, which is the optimal efficiency interval.

The relative horizontal included angle gamma of the connecting line of the point E and the point F is 33 degrees, if the relative horizontal included angle gamma is larger than 33 degrees, the flow of the fan is reduced, if the relative horizontal included angle gamma is smaller than 33 degrees, the pressure of the fan is reduced, if the relative horizontal included angle gamma is smaller than 33 degrees, 30-36 degrees are obtained as the optimal balance interval after the test,

further, the radius R of the transition fillet of all the points is between 30 mm and 50 mm.

The both ends of blade 4 are through welded fastening, and blade 4 all passes through welded fastening with the contact surface of rim plate 1, wheel cap 2, and welded fastening makes blade 4's connection firm more difficult not hard up.

The shaft disc 3 is fixed at the center of the wheel disc 1 through a flange surface by screws, and the shaft disc 3 is connected with a motor shaft by a flat key to transmit torque to drive the impeller to rotate.

The thickness of the wheel disc 1 is greater than that of the wheel cover 2, and since the wheel disc 1 plays a role of transmitting torque, the breaking deformation is more prevented by the thickness thereof.

Specifically, the number of the blades 4 is 8.

A centrifugal fan comprises a motor, a volute and an impeller, wherein the impeller is the double-spiral centrifugal fan impeller, the volute is fixedly connected with the motor, and a motor shaft extends into the volute and is fixed with the impeller.

A method of manufacturing an impeller comprising the steps of:

1. putting two surfaces of the blade 4 into a clamp matched with the structure of the blade, and connecting and fixing contact points at two end parts by welding;

2. each blade 4 is placed on the surface of the wheel disc 1 at the same interval and inclined angle, and then the contact surfaces of the blades and the wheel disc are fixed by welding; in order to facilitate the positioning of the blades 4, a limiting groove can be formed in the surface of the wheel disc 1, and the effect of further fixing the blades 4 is achieved.

3. And placing the wheel cover 2 on the blade 4, and fixing the wheel cover 2 and the blade 4 by adopting a forge welding process so as to finish the integral molding of the impeller.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although various terms are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The double-helix centrifugal fan impeller comprises a wheel disc, a wheel cover, a shaft disc and a plurality of blades, and is characterized in that the blades are obliquely arranged and are circumferentially arranged and fixed on the inner surface of the wheel disc at uniform intervals, the blades are of a double-layer curved surface structure and are fixedly formed by end-to-end connection, the inner parts of the blades are of a cavity structure, the included angle formed between the two end points of the blades and the center of the wheel disc is 42-48 degrees, the two surfaces of the blades comprise A, B, C, D, E, F transition fillets, wherein the range of the central connecting line of the transition fillets A and B relative to the horizontal included angle alpha is 12-16 degrees, the range of the central connecting line of the transition fillets C and D relative to the horizontal included angle beta is 10-14 degrees, and the range of the central connecting line of the transition fillets E and F relative to the horizontal included angle gamma is 30-36 degrees.

2. A twin screw centrifugal fan impeller according to claim 1 in which the centre line of the transition fillets a and B is at an angle α of 14 ° to the horizontal.

3. A twin screw centrifugal fan impeller according to claim 1 in which the centre line of the transition fillets C and D subtends an angle β of 12 ° with respect to the horizontal.

4. A twin screw centrifugal fan impeller according to claim 1 in which the centre line of the transition fillets E and F is at an angle γ of 33 ° to the horizontal.

5. The impeller of the double-helix centrifugal fan as claimed in claim 1, wherein the contact surfaces of the blades, the wheel disc and the wheel cover are fixed by welding.

6. The impeller of the double helix centrifugal fan as claimed in claim 1, wherein the hub is screwed to the center of the hub through a flange surface.

7. The twin screw centrifugal fan impeller of claim 1 wherein the thickness of the disk is greater than the thickness of the shroud.

8. A twin screw centrifugal fan impeller according to claim 1 in which the number of blades is 8.

9. A centrifugal fan comprising a motor, a volute and an impeller, wherein the fan impeller is a twin-screw centrifugal fan impeller according to any one of claims 1 to 8.