CN87201871U

CN87201871U - Centrifugal pump with adjustable diameter of impeller

Info

Publication number: CN87201871U
Application number: CN 87201871
Authority: CN
Inventors: 任树来
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-02-11
Filing date: 1987-02-11
Publication date: 1988-06-15

Abstract

The utility model discloses a centrifugal pump with the adjustable diameter of the impeller blades, which is used for the lifting and the conveying of the slurry material according to different operating conditions; the adjustment of the diameter of the impeller blades can be realized after being exchanged and assembled by movable blades with a plurality of groups of different dimensions, and the dimension of each group of the movable blades can be designed to be suitable for the operation under the preset operating condition.

Description

Centrifugal pump with adjustable diameter of impeller

The utility model is a kind of centrifugal pump, it is characterized in that: the impeller blade diameter can be regulated size, the Specifeca tion speeification of centrifugal pump is worked on optimal values point, and this centrifugal pump is the machinery that belongs to the suction of slurry material and carry purposes.

The Specifeca tion speeification of centrifugal pump is:

H---lift (meter water column) is annotated: promptly represent the entery and delivery port pressure difference value;

D---impeller blade diameter (millimeter); N---air horsepower (kilowatt/hour);

Q---flow (rise/minute); N---spindle speed (rev/min);

Y---Media density (gram per centimeter ³); η---efficient (%)

Present existing centrifugal pump, its impeller blade diameter and shape are the rigid bodies of disposable machine shaping, the centrifugal pump impeller shape and size of certain fixed series pattern are unmodifiable.Selecting for use of this centrifugal pump is parameter according to the operating mode needs, as flow Q, and the highest optimal values of lift H etc. and select certain model centrifugal pump for use.This pump has only two according to the independent variable parameter of the corresponding adjusting of variation energy of outer work condition condition: the one, and spindle speed n can lean on the driving power of speed governing to realize; The 2nd, the pressure in the water-in and water-out pipeline (being lift H) is to regulate by ducted throttle.These two kinds of regulating methods have following shortcoming: the one, and the range of spindle speeds that drives the power drive has certain limitation, it is high more to drive rotating speed, driving torque is more little, because of the too high driving torque of rotating speed does not reach predetermined value, causes the main performance flow Q of centrifugal pump also not reach predetermined value; The 2nd, ducted throttle valve improves (promptly improving outlet conduit pressure) for making lift in use; Throttle valve certainly will be turned down, influence flow equally and do not reach predetermined value.In a word, this regulating method, though can make flow Q, lift H partly adapt to extraneous new operating mode needs, new numerical value has broken away from the optimum performance state in this pump design, produced simultaneously is that efficiency eta descends, and causes energy waste.In order to remedy above-mentioned shortcoming, adapt to the performance need that new operating mode proposes, have to change whole centrifugal pump sometimes and change corresponding apparatus.

The purpose of this utility model is under the condition of not changing whole centrifugal pump, and impeller blade diameter dimension method adapts to new operating mode needs and the New Centrifugal Pump of design in the centrifugal pump with changing.

The utility model is achieved in that the blade-section of existing centrifugal pump impeller is divided into two bodies along the cross-sectional direction of blade to be formed, and is stationary blade body by half blade at center, with impeller all-in-one-piece rigid construction; And half blade locating by the outer of impeller diameter is the moving vane body, adopts general rigid joint mode between moving vane and the stator blade, forms a complete centrifugal pump impeller; On the cover plate up and down of impeller, be equipped with the profiling sliding-groove that moving vane is used is installed.

The utility model is according to the characteristic of centrifugal pump design principle, and the main parameter that needs in several operating modes that propose in advance is as flow Q; Under the condition of lift H etc., designed and produced the impeller moving vane of corresponding some groups of different-diameters, every group of blade diameter data all are to design under this pump optimum performance state according to hydraulic model pump repetition test gained.

As follows according to its principle of the relationship analysis between the several main parameters of performance of centrifugal pump:

(H _p)/(H _m) = ( (D _2p·n _p)/(D _2m·n _m) ) ²；

(N _p)/(N _m) = ( (D _2p)/(D _2m) ) ⁵·( (n _p)/(n _m) ) ³· (r _p)/(r _m) ；

(Q _p)/(Q _m) =( (D _2p)/(D _2m) ) ³· (n _p)/(n _m) ；

(select from centrifugal pump base of design P125; China Machine Press)

According to above relation analysis, impeller blade diameter variation value is 2 power values to the influence of lift; Influence to air horsepower is 5 power values; Influence to flow is 3 power values.Variation is very sensitive to the major parameter value of centrifugal pump to the impeller blade diameter dimension in other words, and the minor variations of diameter dimension can adapt to the bigger variation needs of centrifugal pump major parameter value.

Adjustable centrifugal pump structure of impeller blade diameter of the present utility model and embodiment are as follows: see Figure of description, Fig. 1 is the centrifugal pump plan view; Fig. 2 is the A-A sectional view on Fig. 1; Fig. 3 is the B-B sectional drawing on Fig. 2; Fig. 4 is the C-C sectional drawing on Fig. 2, and structure is: 1, the pump housing; 2, pump cover; 3, pump shaft; 4, bearing; 5, impeller; 6, upper cover plate; 7, lower cover plate; 8, stator blade; 9, moving vane; 10, coupling; 11, profiling sliding-groove.

This centrifugal pump moving vane of the present utility model uses installation method to be: the performance parameter that proposes according to operating mode is chosen one group of moving vane 9 that should be equipped with earlier, then centrifugal pump pump cover 2 is opened, dismantle upper and lower cover plate 6 and 7, releases coupler 10, unload the one group of moving vane that does not re-use, install one group of moving vane preparing use, cover cover plate, install pump cover, can drop into the running of new operating mode.

Claims

1, the adjustable centrifugal pump of a kind of impeller blade diameter, it is made up of the pump housing, pump cover, pump shaft, bearing and impeller, it is characterized in that, the blade-section of described impeller is divided into two bodies composition along the cross-sectional direction of blade, half blade by the center is a stationary blade body, and with impeller all-in-one-piece rigid construction, and half blade-section locating by the impeller diameter outer is the moving vane body, adopt general rigid joint mode between moving vane and the stator blade, form a complete centrifugal pump impeller.

2, the adjustable centrifugal pump of impeller blade diameter according to claim 1, it is characterized in that: impeller is provided with upper and lower cover plate, is equipped with the profiling sliding-groove that moving vane is installed on upper and lower cover plate.