CN203348158U

CN203348158U - Semi-open type impeller structure

Info

Publication number: CN203348158U
Application number: CN 201320440194
Authority: CN
Inventors: 金华明
Original assignee: Wuxi GL Turbo Compressor Co Ltd
Current assignee: Gl-Turbo LLC
Priority date: 2013-07-23
Filing date: 2013-07-23
Publication date: 2013-12-18
Anticipated expiration: 2023-07-23

Abstract

The utility model relates to a part of a high speed off-speed centrifugal fan or a compressor, in particular to a semi-open type impeller structure. The semi-open type impeller structure disclosed by the utility model comprises a blade group and a wheel disc, wherein the blade group is formed by a plurality of blades of the same size, the blades are uniformly and centrosymmetrically distributed on the front face of the wheel disc by taking the center of the wheel disc as a center, the center of the wheel disc is provided with an axial through hole, and the through hole is used for fixing a shaft; under the normal condition, the shaft is arranged in the through hole, a fastening screw is screwed in a threaded hole in the shaft end by virtue of the through hole, and accordingly the fastening screw is axially fixed with the shaft; the impeller structure transmits torque by virtue of the rotation of the shaft; the back surface of the wheel disc is bulged outwards in the normal vector direction to form a boss I, the axis of the boss I is superposed with the axis of the wheel disc, and the through hole runs through the boss I. The semi-open type impeller structure is simple in structure and high in structural strength; the maximum equivalent stress can be reduced by 25% under the same load bearing, and the production cost is low.

Description

The half-opened impeller structure

Technical field

The utility model relates to mechanical field, from the parts of fast centrifugal blower or compressor, is particularly a kind of half-opened impeller structure especially at a high speed.

Background technique

In prior art, high-speed centrifugal fan or compressor adopt half-opened impeller more, and this kind of impeller consists of blade and wheel disc.

Stressed from impeller, it is mainly rotated produced centrifugal forces affect, and from distribution of force, maximum stress concentrates in the central through bore of impeller.And the wheel back structure has critical effect for this maximum stress.When the impeller pressure ratio of large flow surpasses 3, need very high rotating speed.And square being directly proportional of centrifugal force and rotating speed also just means the stressed sharply soaring of impeller, harsher to the requirement of structure.And above-mentioned blade wheel structure can't meet usage requirement on intensity, adopt more high-intensity material if be forced to, can significantly improve cost of production.

How, in the situation that does not adopt high-strength material, the intensity that improves impeller has become the technical problem urgently to be resolved hurrily of industry.

The model utility content

The purpose of this utility model, providing a kind of without adopting high-intensity material, can effectively meet the performance requirement of big-flow high-pressure ratio, and cost is low, has the improvement structure of the half-opened impeller of high bearing capacity.

Model utility purpose of the present utility model realizes like this:

The half-opened impeller structure, comprise vane group and wheel disc, described vane group is comprised of several big or small identical blades, and described blade is centrosymmetric and is uniformly distributed in the front of wheel disc with wheel disk center, the center of described wheel disc is provided with an axial through hole, and described through hole is fixing for axle; Generally, axle is placed in through hole, and fastening screw trip bolt passes through the tapped hole of through hole precession axle head, thereby carries out axial fixing with axle; Blade wheel structure rotates driving torque by axle; In the outwardly formation boss of the back side of wheel disc normal vector direction first, the axis of described boss first and the dead in line of described wheel disc, described through hole connects described boss first.

Further, described boss first is extended out to after the height first and is continued outwardlyly to form to height H by the back side of wheel disc, its described boss first is provided with A-grade in the first class surface, B-grade in the first class surface and junction surface, described junction surface connects respectively described A-grade in the first class surface and described B-grade in the first class surface, and the chamfer radius of described junction surface is R.

Further, the outwardly formation boss of described A-grade in the first class's surface normal direction second, described boss second is provided with second A surface and second B surface, described second B surface connects respectively described A-grade in the first class surface and described second A surface, the axis of described boss second and the dead in line of described wheel disc, described through hole connects described boss second.

Further, the cross section of described boss second is polygonal, and the circular arc that the circular arc that described polygonal is R1 by three sections radiuses and three sections radiuses the are R2 tangent connection in interval successively forms, and wherein R1 is greater than R2.

Further, the external diameter of described wheel disc is D1, and the diameter of described boss first is D2, and the height of described boss first is H, and the chamfer radius of described junction surface is R, 0.2D1≤D2≤0.3D1,0.1D1≤H≤0.2D1,0.4D1≤R≤0.5D1.

The utlity model has following advantage:

1, simple in structure and structural strength is high, under identical stressed carrying, its maximum equivalent can descend more than 25%.

2, without adopting more high-strength material can meet required structural strength, thereby cost of production is low.

The accompanying drawing explanation

Fig. 1 is the utility model structural representation.

The A-A view that Fig. 2 is the utility model structure.

In figure:

1 vane group,

2 wheel discs,

The front of 21 wheel discs,

The back side of 22 wheel discs,

23 through holes,

24 boss first,

241 height first, 242 B-grade in the first class surfaces, 243 A-grade in the first class surfaces, 244 junction surfaces,

H boss first is the height to specified point from the wheel disc back side,

N boss first is gone out the residual altitude after the height to specified point from the wheel disc back side,

H boss first height,

The external diameter of D1 wheel disc,

The minimum diameter of D2 boss first,

The R chamfer radius,

25 boss second,

251 second B surfaces, 252 second A surfaces.

Embodiment

Beneficial effect in order more properly to describe the utility model and to bring, be described further the utility model below in conjunction with accompanying drawing, but protection domain of the present utility model is not limited to the content that embodiment is explained.

Embodiment:

The half-opened impeller structure, comprise vane group 1 and wheel disc 2.Vane group 1 is comprised of 16 identical blades of size; The front 21 that blade is centrosymmetric and is uniformly distributed in wheel disc with wheel disk center, the center of wheel disc is provided with an axial through hole 23, and through hole 23 is fixing for axle, and axle is placed in through hole 23, fastening screw trip bolt passes through the tapped hole of through hole 23 precession axle heads, thereby carries out axial fixing with axle; Blade wheel structure rotates driving torque by axle; In the outwardly formation boss of the back side of wheel disc 22 normal vector direction first 24, the dead in line of the axis of boss first 24 and wheel disc 2, through hole 23 connects boss first 24.

Boss first 24 is extended out to by the back side 22 of wheel disc that the rear continuation of height first 241 is outwardly to be formed to boss first height H, and boss first 24 diameters are constant during to height first 241 from the back side 22 of wheel disc, identical with the diameter at the back side 22 of wheel disc;

Boss first 24 diameters reduce gradually when height first 241 starts to height H boss first 24, and boss first 24 is provided with A-grade in the first class surface 243, B-grade in the first class surface 242 and junction surface 244, and junction surface 244 connects respectively A-grade in the first class surface 243 and B-grade in the first class surface 242.The chamfer radius that boss first 24 forms at junction surface 244 is 45cm.

The outwardly formation boss of A-grade in the first class's surface 243 normal vector direction second 25, boss second 25 is provided with second A surface 252 and second B surface 251, second B surface 251 connects respectively A-grade in the first class surface 243 and second A surface 252, the dead in line of the axis of boss second 25 and wheel disc 2, and through hole 23 connects boss second 25.

The cross section of boss second 25 is polygonal, and the circular arc that the circular arc that polygonal is 19.85cm by three sections radiuses and three sections radiuses the are 8.15cm tangent connection in interval successively forms.

The external diameter of wheel disc is 100cm, and boss first diameter is 25cm, and the height of boss first is 15cm.

D1 can be arbitrary dimension, and general D1 is between 20cm to 100cm.

Now, the half-opened impeller maximum equivalent reduces by 25%.

Claims

1. half-opened impeller structure, comprise vane group and wheel disc, described vane group is comprised of several blades, described blade is centrosymmetric and is uniformly distributed in the front of wheel disc with wheel disk center, the center of described wheel disc is provided with an axial through hole, it is characterized in that, in the outwardly formation boss of the back side of wheel disc normal vector direction first, the axis of described boss first and the dead in line of described wheel disc, described through hole connects described boss first.

2. half-opened impeller structure according to claim 1, it is characterized in that, described boss first is extended out to after the height first and is continued outwardlyly to form to height H by the back side of wheel disc, its described boss first is provided with A-grade in the first class surface, B-grade in the first class surface and junction surface, described junction surface connects respectively described A-grade in the first class surface and described B-grade in the first class surface, and the chamfer radius of described junction surface is R.

3. half-opened impeller structure according to claim 2, it is characterized in that, the outwardly formation boss of described A-grade in the first class's surface normal direction second, described boss second is provided with second A surface and second B surface, described second B surface connects respectively described A-grade in the first class surface and described second A surface, the axis of described boss second and the dead in line of described wheel disc, described through hole connects described boss second.

4. half-opened impeller structure according to claim 3, it is characterized in that, the cross section of described boss second is polygonal, and the circular arc that the circular arc that described polygonal is R1 by three sections radiuses and three sections radiuses the are R2 tangent connection in interval successively forms, and wherein R1 is greater than R2.

5. according to the described half-opened impeller structure of claim 2 to 4 any one, it is characterized in that, the external diameter of described wheel disc is D1, the diameter of described boss first is D2, the height of described boss first is H, and the chamfer radius of described junction surface is R, 0.2D1≤D2≤0.3D1,0.1D1≤H≤0.2D1,0.4D1≤R≤0.5D1.