CN103557181B - A kind of Hydraulic Design Method with deviated splitter vane torque flow pump - Google Patents

Abstract

The present invention relates to a kind of Hydraulic Design Method with deviated splitter vane torque flow pump, which give the design formula of impeller main geometric parameters inlet diameter, impeller linear leaf number, impeller outlet width, impeller is half-opened impeller, deviated splitter vane alternately, linear leaf is identical with short blade number and be uniformly distributed, the present invention adopts method of enlarged flow design to carry out the Hydraulic Design, the structure that deviated splitter vane distributes alternately effectively can reduce the whirlpool loss in pump case, the efficiency of pump and reliability are improved, there is good economic benefit.

Description

A kind of Hydraulic Design Method with deviated splitter vane torque flow pump

Technical field

The present invention relates to a kind of vortex pump impeller design method, particularly a kind of torque flow pump Hydraulic Design Method with deviated splitter vane.

Background technique

The half-opened impeller that current torque flow pump adopts is made up of back shroud, blade and wheel hub, and blade is prismatic blade and radially arranges.Impeller is connected with motor shaft, convection cell acting under the drive of axle.But owing to adopting the torque flow pump of this impeller, fluid can produce whirlpool under impeller action, and the mobility status in spiral case is very disorderly.Therefore, lift of pump and efficiency reduce greatly, and the efficiency of pump, substantially below 60%, causes the serious waste of the energy.

Summary of the invention

For solving the problem, the invention provides a kind of vortex pump impeller with deviated splitter vane.By improving the several important design parameter of impeller and adopting the impeller of deviated splitter vane structure, improve hydraulic performance and the reliability of torque flow pump.

Realizing the technological scheme that above-mentioned purpose adopts is:

The main structure parameters of vortex pump impeller is obtained by following computational methods:

(1) method of enlarged flow design is utilized to carry out the Hydraulic Design

$\left.\begin{array}{c}{Q}^{\′}=K_{1}Q\\ n_s^{\′}=K_2{n}_s\end{array}\right\}$

Q-design discharge, m ³/ s;

Flow after Q '-increasing, m ³/ s;

N _sthe specific speed of-design conditions, gets between 55 ~ 150;

N ' _sspecific speed after-increasing;

K ₁, K ₂be respectively the power gain of flow and specific speed.

(2) impeller outlet diameter D ₂determination

$D_2=19.75{\left(\frac{n_s^{\′}}{100}\right)}^{1/6}\frac{\sqrt{2gH}}{n}$

In formula:

D ₂-impeller outlet diameter, m;

H-rated lift, m;

N-rotating speed, r/min;

(3) impeller outlet width b ₂

$b_2=0.74{\left(\frac{n_s^{\′}}{100}\right)}^{5/6}\sqrt[3]{\frac{Q^{\′}}{n}}$

In formula:

Flow after Q '-increasing, m ³/ s;

(4) impeller inlet diameter D ₁

$D_1=K_0\sqrt[3]{\frac{Q^{\′}}{n}}$

In formula:

D ₁-impeller inlet diameter, m;

K ₀-impeller inlet velocity coefficient, gets 4.85 ~ 5.1;

N-rotating speed, r/min;

(5) the choosing of linear leaf number Z

$Z=4.75{\left(\frac{n_s^{\′}}{100}\right)}^{0.275}$

Z≥5；

In formula: n ' _sspecific speed after-increasing;

Need after calculating to carry out rounding to it, blade is arranged according to the mode that length is alternate, and therefore short blade number is identical with linear leaf number, and deviated splitter vane is uniformly distributed on back shroud.

(6) linear leaf length L ₁with short blade length L ₂the choosing of ratio

$0.65\≤\frac{L_2}{L_1}\≤0.85;$

According to above step, we can obtain a kind of vortex pump impeller design method with deviated splitter vane.

Inlet diameter, impeller blade number Z, impeller outlet width b is comprised by above-mentioned computational methods determination impeller main geometric parameters ₂deng, deviated splitter vane makes the efficiency of torque flow pump be improved simultaneously.

The invention has the beneficial effects as follows: the impeller gone out by enlarged flow design method design, there is good hydraulic performance, the form of deviated splitter vane simultaneously, ensureing under the prerequisite that torque flow pump normally works, effectively can reduce the energy loss of whirlpool in pump chamber, promote the efficiency of torque flow pump, produce good economic benefit in practice.

Accompanying drawing explanation

Fig. 1 is the impeller axis projection of one embodiment of the invention

Fig. 2 is the impeller blade figure of same embodiment

In figure: 1. back shroud of impeller, 2. impeller outlet diameter D ₂, 3. short blade, 4. wheel hub, 5. linear leaf, 6. impeller outlet width b ₂.

Embodiment

Fig. 1 and Fig. 2 combination defines the impeller shape of this embodiment.It has back shroud of impeller (1), is a kind of half-opened impeller, and the number of blade 5≤Z, can mobility status be improved, improve hydraulic performance and the reliability of torque flow pump.The present invention utilizes following relation to determine the main geometric parameters of impeller, mainly comprises: (2) impeller outlet diameter D ₂, (6) impeller outlet width b ₂, number of blade Z, the length ratio of deviated splitter vane.

Relation is as follows:

$\left.\begin{array}{c}{Q}^{\′}=K_{1}Q\\ n_s^{\′}=K_2{n}_s\end{array}\right\}$

$D_2=19.75{\left(\frac{n_s^{\′}}{100}\right)}^{1/6}\frac{\sqrt{2gH}}{n};$

$b_2=0.74{\left(\frac{n_s^{\′}}{100}\right)}^{5/6}\sqrt[3]{\frac{Q^{\′}}{n}};$

$Z=4.75{\left(\frac{n_s^{\′}}{100}\right)}^{0.275};$

Z≥5；

$0.65\≤\frac{L_2}{L_1}\≤0.85;$

The present invention adopts method of enlarged flow design to carry out the Hydraulic Design, and the structure that deviated splitter vane distributes alternately effectively can reduce the whirlpool loss in pump case, the efficiency of pump is improved, has good economic benefit.

Above, that makes with reference to embodiment for patent of the present invention illustrates, but the present invention is not limited to above-described embodiment, also comprises other embodiments in concept of the present invention or variation.

Claims (2)

1. the Hydraulic Design Method with deviated splitter vane torque flow pump, it designs the geometric parameter of vortex pump impeller blade according to torque flow pump rated lift H, design discharge Q, rotating speed n, it is characterized in that: adopt method of enlarged flow design to carry out impeller the Hydraulic Design, the impeller geometric parameter that torque flow pump is main, comprises impeller outlet diameter D ₂, impeller outlet width b ₂, impeller inlet diameter D ₁, linear leaf number Z, and between pump operating point for design performance parameter be applicable to following relation:

$\left.\begin{array}{c}{Q}^{\′}=K_{1}Q\\ n_s^{\′}=K_2{n}_s\end{array}\right\}$

$D_2=19.75{\left(\frac{n_s^{\′}}{100}\right)}^{1/6}\frac{\sqrt{2gH}}{n};---\left(2\right)$

$b_2=0.74{\left(\frac{n_s^{\′}}{100}\right)}^{5/6}\sqrt[3]{\frac{Q^{\′}}{n}};---\left(3\right)$

$D_1=K_0\sqrt[3]{\frac{Q^{\′}}{n}};---\left(4\right)$

$Z=4.75{\left(\frac{n_s^{\′}}{100}\right)}^{0.275}---\left(5\right)$

Z≥5（6）

$0.65\≤\frac{L_2}{L_1}\≤0.85---\left(7\right)$

In formula:

Q-design discharge, m ³/ s;

Flow after Q '-increasing, m ³/ s;

N _sthe specific speed of-design conditions, gets between 55 ~ 150;

N ' _sspecific speed after-increasing;

K ₁, K ₂be respectively the power gain of flow and specific speed;

D ₂-impeller outlet diameter, m;

The rated lift of H-pump, m;

N-rotating speed, r/min;

D ₁-impeller inlet diameter, m;

K ₀-impeller inlet velocity coefficient, gets 4.85 ~ 5.1;

L ₁, L ₂-long and short length of blade, m.

2. a kind of torque flow pump Hydraulic Design Method with deviated splitter vane as claimed in claim 1, it is characterized in that: impeller is half-opened impeller, alternately, linear leaf number is more than or equal to 5 to deviated splitter vane, and linear leaf is identical with short blade number, is evenly distributed on back shroud.