CN2345758Y

CN2345758Y - Centrifugal pump impeller with twisted salix-leaf-type blade

Info

Publication number: CN2345758Y
Application number: CN 98204606
Authority: CN
Inventors: 高歌; 刘宝杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-13
Filing date: 1998-05-13
Publication date: 1999-10-27
Anticipated expiration: 2008-05-13

Abstract

The utility model relates to a centrifugal pump impeller with a twisted willow leaf-shaped blade, which is suitable for models of a centrifugal water pump or an air pump. The utility model is composed of a rear side wall, a blade, and a front side wall which are fixed to be integration. The centre hole of the rear side wall can form the key-type connection with a driving shaft; a curved line of the blade is axially symmetric with a shaft line of the impeller; after the blade and a blade core line are straightened on the cross section which is perpendicular to the shaft, the blade can be in a willow leaf shape, and after the blade is twisted, the blade is arranged to be the blade with a double twist from a concave side to a convex side and the changeable thickness or the blade with a center line with a single twist from a straight line to a convex surface and the changeable thickness. The utility model has the advantages of high efficiency, alleviated cavitation phenomenon, and improved service life.

Description

Centrifugal pump impeller with distortion willow leaf type blade

The utility model relates to a kind of centrifugal pump impeller with distortion willow leaf type blade, belongs to field of fluid machinery, is applicable to the moulding of centrifugal water pump or centrifugal air pump impeller blade.

Use history surplus the centrifugal pump existing 100 year, what the blade in the centrifugal pump impeller was the most frequently used be linear blade, helix blade, the thickness of blade have two kinds of equal thickness and thickening degree, move towards to be divided into straight line type by the center line of vane thickness; Single bending direction to the straight type of palintrope convex or earlier recessed back; The protruding opisthocoelous of the elder generation of tangent bend direction, the centrifugal pump of above-mentioned various blades all has U. S. Patent, but all exists the efficient of pump low, and the impeller cavitation phenomenons is serious, thereby problem such as working life is short.

In order to address the above problem, the utility model provides a kind of efficient height of pump, the centrifugal pump impeller with distortion willow leaf type blade of impeller long service life.

It is as follows to finish the technical measures that the utility model task taked: the utility model is to be connected by rear sidewall, blade, front panel, the center hole of rear sidewall is key with axle and connects and composes, in order to reduce the influence of rotating the coriolis force that produces, the blade curve to the impeller axis axisymmetricly, on cross section perpendicular to axle, as blade is the willow leaf type with its center line after stretching, blade is arranged to by the protruding single distortion thickening degree blades of protruding two distortion thickening degree blades in outwards earlier recessed back, center or the straight earlier back of center line after with the center line distortion.

Fig. 1 is the centrifugal pump structure longitudinal section, and 1 is the pump housing among the figure, the 2nd, and impeller, the 3rd, pump cover, the 4th, suspension, the 5th, axle, 6,7 is respectively pressure tap, dewatering orifice plug, Fig. 2 is the longitudinal section of the utility model impeller 2, and Fig. 3 is the A-A sectional view of Fig. 2, and Fig. 4 is the longitudinal section of the utility model impeller, Fig. 5 is the B-B sectional view of Fig. 4, Fig. 6 be this impeller blade along the center string of a musical instrument schematic representation after stretching, Fig. 7 is blade enlarged diagram among Fig. 3, Fig. 8 is blade enlarged diagram among Fig. 5.

In conjunction with the accompanying drawings structure of the present utility model and embodiment are described as follows: the utility model is by rear sidewall 21, blade 22, front panel 23 cast solids constitute, the center hole of rear sidewall is key with live axle and is connected, blade 22 with axis for being symmetrical arranged, on longitudinal section, high shape of blade-side and the curved convergent channel shape from the entry end to the outlet end match, entry end can be done the axial flow pretwist, also pretwist and be vertical type not, in order to eliminate the influence of coriolis force, on perpendicular to the cross section of axle, blade 22 is carried out two distortions as shown in Figure 3, or single distortion, as shown in Figure 5, as blade is then become the willow leaf type by its mid-depth line is stretching, blade can be arranged to by the protruding single distortion thickening degree blades of protruding two distortion thickening degree blades in outwards earlier recessed back, center or straight earlier back after with the center line distortion.

The maximum blade thickness position is the 0.1-0.5 of center line chord L apart from the distance of outlet end, maximum ga(u)ge T is 0.05-0.25 with the ratio of center line chord L, two twisted blade center curve are connected and composed by the iso-curvature curve, also can connect and compose by the variable curvature curve, curvilinear transformation flex point A is the 0.1-0.75 of center curve chord length apart from the distance of entry end, the minimum profile curvature radius R of sag vertical curve ₂Be the 0.2-3.0 of center curve chord length, the minimum profile curvature radius R of convex curve ₁Be the 0.2-2.0 of chord length L, single twisted blade male bend part starting point B is the 0.2-0.85 of center curve chord length L apart from the outlet end distance, and the minimum bend radius of curvature R is the 0.2-3.0 of center curve chord length.

Detect through China Chemical Equipment Corp. pump series products quality testing center: on the IS80-65-160 pump, carried out the test of single distortion willow leaf type blade, the efficient of pump brings up to 81.8% by 73%, carried out the test of single distortion willow leaf type blade on the IS65-50-160 pump, the efficient of pump brings up to 75% by 66%; Carried out the test of two distortion willow leaf type blades on the IS80-65-160 pump through aeroengine aerothermodynamic laboratory (National Key Laboratory), the efficient of impeller brings up to 86% by 69%.

Above-mentioned testing result has illustrated that distortion willow leaf type centrifugal pump impeller can improve the efficient of centrifugal pump effectively, alleviates or has eliminated cavitation phenomenons, has improved the working life of impeller, has obtained the effect of efficient energy-saving.

Claims

1, a kind of centrifugal pump impeller with distortion willow leaf type blade, constitute by rear sidewall, blade, front panel cast solid, the center hole of rear sidewall is key with live axle and is connected, blade with axis for being symmetrical arranged, on longitudinal section, high shape of blade-side and the curved convergent channel shape from the entry end to the outlet end match, it is characterized in that, on cross section perpendicular to axle, blade (22) is carried out two distortions, be arranged to by the protruding two distortion thickening degree blades in outwards earlier recessed back, center, two twisted blade center curve are connected and composed by the iso-curvature radius curve.

2, by the described centrifugal pump impeller of claim 1, it is characterized in that two twisted blade center curve can be connected and composed by the variable curvature radius curve.

3, by claim 1 or 2 described centrifugal pump impellers, it is characterized in that, the maximum blade thickness position is the 0.1-0.5 of center curve chord length (L) apart from the distance of outlet end, maximum ga(u)ge (T) is 0.05-0.25 with the ratio of chord length (L), curvilinear transformation flex point (A) is the 0.1-0.75 of center curve chord length apart from the distance of entry end, the minimum profile curvature radius (R of sag vertical curve ₂) be the 0.2-3.0 of center curve chord length (L), the minimum profile curvature radius (R of convex curve ₁) be the 0.2-2.0 of chord length.

4, by the described centrifugal pump impeller of claim 1, it is characterized in that, on cross section, blade (22) is carried out single distortion, be arranged to center line by the protruding single distortion thickening degree blade in outwards straight earlier back, center perpendicular to axle.

5, by the described centrifugal pump impeller of claim 4, it is characterized in that, single distortion thickening degree blade male bend part starting point (B) is the 0.2-0.85 of center curve chord length (L) apart from the distance of outlet end, and the minimum bend radius of curvature R is the 0.2-3.0 of center curve chord length (L).