CN105971926A - Design method of impeller double-end edge folding blade V-shaped cutting structure of double suction pump - Google Patents

Abstract

The invention provides a design method of an impeller double-end edge folding blade V-shaped cutting structure of a double suction pump. Blades on an outlet are cut to be of the V-shaped structure, and the requirement of a user for different lifts can be met to be maximum degree; and edge folding outlet edge blades are adopted and staggered at the impeller outlet, the staggered blades are designed to have different inlet and outlet mounting angles and wrap angles, the blades with different widths are arranged on an impeller inlet and outlet, according to actual requirements of the edge folding blades, the impeller inlet equivalent weight diameter, the impeller inlet diameter, the impeller outlet diameter, the impeller outlet width, the blade outlet mounting angles, the blade wrap angles, the actual cut outer diameter, and the thickness of the blades on the impeller outlet are designed according to actual requirements, and therefore when the double suction pump runs under the partial working condition, the number of runners is changed into two from one originally, and fluid in different flowing states flows in the different runners.

Description

A kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method

Technical field

The present invention relates to a kind of double-suction pump impeller blade construction method for designing, particularly to a kind of double-suction pump impeller both-end Edge folding blades V-type cutting construction design method.

Background technology

Pump is a kind of application universal machine the most widely, of a great variety, has inseparable pass with the life of the mankind System, every place having liquid to flow, nearly all there is the operation work of pump.Along with scientific and technological level constantly improves, pump is transported Field the most constantly expand.Double entry pump is the most common a kind of pump, due to it have that flow is big, lift is high, simple in construction, The features such as maintenance is convenient, are widely used in various hydraulic engineering field, are the one being most widely used in various pump, extensively It is applied in each department of the social lifes such as city water, petrochemical industry, shipping industry agricultural irrigation and national economy.Therefore Double suction pump performance is proposed the highest requirement, the requirement that runs such as inclined stable conditions, the requirement of low-noise vibrating and High reliability etc..But in engineering reality, it is frequently present of pump head far above the situation of lift needed for output system.This is usually The requirement of different user is met so that it is can work, simultaneously under specific lift and flow point by the way of cutting impeller Reach the purpose of energy saving in pumping station.But, the conventional hydraulic method for designing of double entry pump can only meet one or several design conditions and want Asking, and run under double entry pump is many times required for inclined operating mode in real world applications, traditional blade wheel structure is difficult to meet double entry pump Run under inclined operating mode.Double entry pump runs under inclined operating mode and may result in double entry pump and operation normally can not can produce noise and shaking Dynamic, aggravating working environment, it is unfavorable for production efficiency.

Summary of the invention

For problem produced in double entry pump running, the invention provides a kind of double-suction pump impeller both-end flanging leaf Sheet V-type cutting construction design method.Exit blade cuts is V-structure, can meet and at utmost meet user to different The demand of lift；Using flanging Exit-edge blade to make blade stagger at impeller outlet, the blade that design is staggered has different entering Export laying angle and cornerite and have different width of blades at impeller import and export, rationally setting according to the actual requirement of edge folding blades Count out the import equivalent diameter of impeller, impeller inlet diameter, impeller outlet diameter, impeller outlet width, blade exit laying angle, Actual outside diameter after subtended angle of blade, cutting, vane thickness at impeller outlet, when making double entry pump run under inclined operating mode, script One runner becomes two, makes the fluid of different flow regime flow in different runners respectively.

1, impeller inlet equivalent diameter D₀Determined by following formula:

$D_0=\left\{\begin{array}{c}(4.7n^{-0.333}{Q}^{0.333}+0.21{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333})(H\≤100)\\ (5.3n^{-0.333}{Q}^{0.333}+0.27{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333})(H>100)\end{array}\right.$

In formula:

D₀Impeller inlet equivalent diameter, m；

Q flow, m³/s；

H lift, m；

N rotating speed, rev/min；

2, impeller outlet diameter D₂Determined by following formula:

$D_2=\left\{\begin{array}{c}47.6n^{-0.833}{Q}^{-0.008}{H}^{0.375}+0.24{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333}(H\≤100)\\ 45.9n^{-0.833}{Q}^{-0.008}{H}^{0.375}+0.13{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333}(H>100)\end{array}\right.$

In formula:

D₂Impeller outlet diameter, m；

N rotating speed, rev/min；

Q flow, m³/s；

H lift, m；

G acceleration of gravity, m²/s；

3, impeller blade entrance width b₁Determined by below equation:

(a) impeller flanging blade entrance width b₁₁Determined by below equation:

b₁₁=0.02D₂+0.1n^-0 _. ³³³Q^0.333

(b) impeller flanging lower blade entrance width b₁₂Determined by below equation:

b₁₂=0.01D₂+0.05n^-0 _. ³³³Q^0.333

4, angle beta is laid in impeller blade import₁Size is determined by following formula:

A angle beta is laid in the flanging blade import of () impeller₁₁Determined by below equation:

${\mathrm{\β}}_{11}=\left\{\begin{array}{c}10+arctan\left(\right(0.07Z+0.4\left)\frac{8.1Q}{{\mathrm{nD}}_0^2{b}_{11}}\right)(Q\≤3600)\\ 10+\arctan \left(\right(1.21Z^{0.02}-0.3\left)\frac{6.9Q}{{\mathrm{nD}}_0^2{b}_{11}}\right)(Q>3600)\end{array}\right.$

B angle beta is laid in the flanging lower blade import of () impeller₁₂Determined by below equation:

${\mathrm{\β}}_{12}=\left\{\begin{array}{c}10+arctan\left(\right(0.07Z+0.4\left)\frac{8.1Q}{{\mathrm{nD}}_0^2{b}_{12}}\right)(Q\≤3600)\\ 10+\arctan \left(\right(1.21Z^{0.02}-0.3\left)\frac{6.9Q}{{\mathrm{nD}}_0^2{b}_{12}}\right)(Q>3600)\end{array}\right.$

In formula:

β₁₁Blade import laying angle, °；

β₁₂Lower blade import laying angle, °；

D₀Impeller inlet equivalent diameter, m；

b₁₁Upper impeller inlet width, m；

b₁₂Lower impeller entrance width, m；

Q flow, m³/s；

The Z number of blade, piece.

5, blade exit lays angle beta₂Size is determined by following formula:

A angle beta is laid in the outlet of () impeller flanging blade₂₁Determined by below equation:

${\mathrm{\β}}_{21}=\left\{\begin{array}{c}12+arctan\left(\right(0.07Z+0.4\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{21}}\right)(H\≤100)\\ 12+\arctan \left(\right(1.12Z^{0.03}+0.03\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{21}}\right)(H>100)\end{array}\right.$

B angle beta is laid in the outlet of () impeller flanging lower blade₂₂Determined by below equation:

${\mathrm{\β}}_{22}=\left\{\begin{array}{c}12+arctan\left(\right(0.06Z+0.7\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{22}}\right)(H\≤100)\\ 12+\arctan \left(\right(1.12Z^{0.03}+0.02\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{22}}\right)(H>100)\end{array}\right.$

In formula:

β₂₁Blade outlet laying angle, °；

β₂₂Lower blade outlet laying angle, °；

D₂Impeller outlet equivalent diameter, m；

b₂₁Upper impeller outlet width, m；

b₂₂Lower impeller outlet width, m；

Q flow, m³/s；

The Z number of blade, piece；

4, blade exit width b₂Size is determined by following formula:

(a) impeller flanging blade exit width b₂₁Determined by below equation:

$b_{21}=(1.1~1.2)\frac{D_0{b}_{11}}{D_2}$

(b) impeller flanging lower blade exit width b₂₂Determined by below equation:

$b_{22}=(1.1~1.2)\frac{D_0{b}_{12}}{D_2}$

In formula:

b₂₁Blade exit width, m；

b₂₂Lower blade exit width, m；

D₀Impeller inlet equivalent diameter, m；

D₂Impeller outlet diameter, m；

b₁₁Upper impeller inlet width, m；

b₁₂Lower impeller entrance width, m；

5, subtended angle of bladeSize is determined by following formula:

(a) impeller flanging blade corneriteDetermined by below equation:

(b) impeller flanging lower blade corneriteDetermined by below equation:

In formula:

Blade cornerite, °；

Lower blade cornerite, °；

D₀Impeller inlet equivalent diameter, m；

D₂Impeller outlet diameter, m；

6, the import and export thickness S of impeller blade is determined by below equation

(a) impeller edge folding blades import department thickness S₁Determined by below equation:

$\left\{\begin{array}{c}{S}_{11}=0.02D_2+0.009{\left(gH\right)}^{0.5}{n}^{-1}\\ S_{12}=0.01D_2+0.013{\left(gH\right)}^{0.5}{n}^{-1}\end{array}\right.$

(b) impeller edge folding blades exit thickness S₂Determined by below equation:

$\left\{\begin{array}{c}{S}_{21}=0.009D_2+0.01{\left(gH\right)}^{0.5}{n}^{-1}\\ S_{22}=0.01D_2+0.005{\left(gH\right)}^{0.5}{n}^{-1}\end{array}\right.$

In formula:

S₁₁Impeller flanging blade import department thickness, m；

S₁₂Impeller flanging lower blade import department thickness, m；

S₂₁Impeller flanging blade exit thickness, m；

S₂₂Impeller flanging lower blade exit thickness, m；

G acceleration of gravity, m²/s；

H lift, m；

N rotating speed, rev/min；

D₂Impeller outlet diameter, m；

7, actual outside diameter D' after the cutting of impeller blade exit₂Determined by below equation:

D'₂=D₂-(0.1b₂₁+b₂₂)tanθ

In formula:

D'₂Actual outside diameter after the cutting of impeller blade exit, m；

D₂Impeller outlet diameter, m；

b₂₁Blade exit width, m；

b₂₂Lower blade exit width, m；

θ impeller blade exit cutting angle, 0 °～15 °；

The invention has the beneficial effects as follows: joined by the optimum structure of the blade appropriate design double entry pump at flanging impeller outlet Number, can effectively alleviate blade loads, improve double entry pump in running in impeller liquid relative motion at axial whirlpool to shadow Ring hydraulic performance and the wake flow of impeller outlet and the stator-rotor interaction of pumping chamber；Improve in double suction pump performance and running Stability.

Accompanying drawing explanation

Fig. 1 is the plane figure of the embodiment of the present invention.

Fig. 2 is the axial plane figure of the embodiment of the present invention.

Fig. 3 is that the present invention implements impeller blade schematic diagram.

Description of reference numerals:

Fig. 1: β₁₁Blade import laying angle, β₁₂Lower blade import laying angle, β₂₁Blade outlet laying angle, β₂₂Lower blade outlet laying angle,Blade cornerite,Lower blade cornerite.

Fig. 2: D₀Impeller inlet equivalent diameter, D₂Impeller outlet diameter, D '₂Reality after cutting at blade exit External diameter, b₁₁Blade entrance width, b₁₂Lower blade entrance width, b₂₁Blade exit width, b₂₂Lower blade exports Width, θ impeller blade exit cutting angle, S₁₁Impeller flanging blade import department thickness, S₁₂Impeller flanging inferior lobe Sheet import department thickness, S₂₁Impeller flanging blade exit thickness, S₂₂Impeller flanging lower blade exit thickness.

Fig. 3: 1 impeller blade, 2 impeller lower blades.

Detailed description of the invention

Design requires: design conditions flow is 0.096764 cube of meter per second, and design conditions lift is 60 meters, and rotating speed is 2900 revolutions per seconds, g takes 10 meters/square metre, and the number of blade takes 4 pieces, and cutting angle is 10.

The numerical value of impeller structure parameter: D can be obtained according to data above₀=170mm；D₂=390mm；D’₂=300mm；β₁₁ =17 °；β₁₂=18 °；β₂₁=21 °；β₂₂=23 °；b₁₁=11mm；b₁₂=8mm；b₂₁=10mm；b₂₂ =7mm；S₁₁=6mm；S₁₂=5mm；S₂₁=7mm；S₂₂=6mm；

In the design process, the selection of other coefficient needs to carry out coefficient according to concrete practical situation and choose, such as impeller Spiral case parameter needs to select according to the actual motion of pump.

Above, by the present invention with reference to illustrating that embodiment is made, but the present invention is not limited to above-described embodiment, Also the other embodiments in the range of present inventive concept or variation are comprised.

Claims (9)

1. a double-suction pump impeller both-end edge folding blades V-type cutting construction design method, it is characterised in that: at design double entry pump leaf During impeller blade, the impeller blade port of export uses layering folded edges；Wherein impeller inlet equivalent diameter D₀Determined by following formula:

$D_0=\left\{\begin{array}{c}(4.7n^{-0.333}{Q}^{0.333}+0.21{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333})(H\≤100)\\ (5.3n^{-0.333}{Q}^{0.333}+0.27{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333})(H>100)\end{array}\right.$

In formula:

D₀Impeller inlet equivalent diameter, m；

Q flow, m³/s；

H lift, m；

G acceleration of gravity, m²/s；

N rotating speed, rev/min.

2. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: impeller outlet diameter D₂Determined by following formula formula:

$D_2=\left\{\begin{array}{c}47.6n^{-0.833}{Q}^{-0.008}{H}^{0.375}+0.24{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333}(H\≤100)\\ 45.9n^{-0.833}{Q}^{-0.008}{H}^{0.375}+0.13{\left(gH\right)}^{0.5}{n}^{-1.333}{Q}^{0.333}(H>100)\end{array}\right.$

In formula:

D₂Impeller outlet diameter, m；

N rotating speed, rev/min；

Q flow, m³/s；

G acceleration of gravity, m²/s；

H lift, m.

3. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: impeller blade entrance width b₁Determined by below equation:

(a) impeller flanging blade entrance width b₁₁Determined by below equation:

b₁₁=0.02D₂+0.1n^-0 _. ³³³Q^0.333

(b) impeller flanging lower blade entrance width b₁₂Determined by below equation:

b₁₂=0.01D₂+0.05n^-0 _. ³³³Q^0.333

In formula:

b₁₁Upper impeller inlet width, m；

b₁₂Lower impeller entrance width, m；

D₀Impeller inlet equivalent diameter, m；

N rotating speed, rev/min；

Q flow, m³/s。

4. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: angle beta is laid in impeller blade import₁Determined by below equation:

A angle beta is laid in the flanging blade import of () impeller₁₁Determined by below equation:

${\mathrm{\β}}_{11}=\left\{\begin{array}{c}10+arctan\left(\right(0.07Z+0.4\left)\frac{8.1Q}{{\mathrm{nD}}_0^2{b}_{11}}\right)(Q\≤3600)\\ 10+\arctan \left(\right(1.21Z^{0.02}-0.3\left)\frac{6.9Q}{{\mathrm{nD}}_0^2{b}_{11}}\right)(Q>3600)\end{array}\right.$

B angle beta is laid in the flanging lower blade import of () impeller₁₂Determined by below equation:

${\mathrm{\β}}_{12}=\left\{\begin{array}{c}10+arctan\left(\right(0.07Z+0.4\left)\frac{8.1Q}{{\mathrm{nD}}_0^2{b}_{12}}\right)(Q\≤3600)\\ 10+\arctan \left(\right(1.21Z^{0.02}-0.3\left)\frac{6.9Q}{{\mathrm{nD}}_0^2{b}_{12}}\right)(Q>3600)\end{array}\right.$

In formula:

β₁₁Blade import laying angle, °；

β₁₂Lower blade import laying angle, °；

D₀Impeller inlet equivalent diameter, m；

b₁₁Upper impeller inlet width, m；

b₁₂Lower impeller entrance width, m；

Q flow, m³/s；

The Z number of blade, piece.

5. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: angle beta is laid in impeller blade outlet₂Determined by below equation:

A angle beta is laid in the outlet of () impeller flanging blade₂₁Determined by below equation:

${\mathrm{\β}}_{21}=\left\{\begin{array}{c}12+arctan\left(\right(0.07Z+0.4\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{21}}\right)(H\≤100)\\ 12+\arctan \left(\right(1.12Z^{0.03}+0.03\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{21}}\right)(H>100)\end{array}\right.$

B angle beta is laid in the outlet of () impeller flanging lower blade₁₂Determined by below equation:

${\mathrm{\β}}_{22}=\left\{\begin{array}{c}12+arctan\left(\right(0.06Z+0.7\left)\frac{Q}{{\mathrm{nD}}_2^2{b}_{22}}\right)(H\≤100)\\ 12+\arctan \left(\right(1.12Z^{0.03}+0.02\left)\frac{Q}{{\mathrm{nD}}_0^2{b}_{22}}\right)(H>100)\end{array}\right.$

In formula:

β₂₁Blade outlet laying angle, °；

β₂₂Lower blade outlet laying angle, °；

D₂Impeller outlet equivalent diameter, m；

b₂₁Upper impeller outlet width, m；

b₂₂Lower impeller outlet width, m；

N rotating speed, rev/min；

Q flow, m³/s；

The Z number of blade, piece.

6. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: impeller blade exit width b₂Determined by below equation:

(a) impeller flanging blade exit width b₂₁Determined by below equation:

$b_{21}=(1.1~1.2)\frac{D_0{b}_{11}}{D_2}$

(b) impeller flanging lower blade exit width b₂₂Determined by below equation:

$b_{22}=(1.1~1.2)\frac{D_0{b}_{12}}{D_2}$

In formula:

b₂₁Blade exit width, m；

b₂₂Lower blade exit width, m；

D₀Impeller inlet equivalent diameter, m；

D₂Impeller outlet diameter, m；

b₁₁Upper impeller inlet width, m；

b₁₂Lower impeller entrance width, m.

7. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: impeller blade corneriteDetermined by below equation:

(a) impeller flanging blade corneriteDetermined by below equation:

(b) impeller flanging lower blade corneriteDetermined by below equation:

In formula:

Blade cornerite, °；

Lower blade cornerite, °；

D₀Impeller inlet equivalent diameter, m；

D₂Impeller outlet diameter, m.

8. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: the import and export vane thickness S of impeller blade is determined by below equation:

(a) impeller edge folding blades import department thickness S₁Determined by below equation:

$\left\{\begin{array}{c}{S}_{11}=0.02D_2+0.009{\left(gH\right)}^{0.5}{n}^{-1}\\ S_{12}=0.01D_2+0.013{\left(gH\right)}^{0.5}{n}^{-1}\end{array}\right.$

(b) impeller edge folding blades exit thickness S₂Determined by below equation:

$\left\{\begin{array}{c}{S}_{21}=0.009D_2+0.01{\left(gH\right)}^{0.5}{n}^{-1}\\ S_{22}=0.01D_2+0.005{\left(gH\right)}^{0.5}{n}^{-1}\end{array}\right.$

In formula:

S₁₁Impeller flanging blade import department thickness, m；

S₁₂Impeller flanging lower blade import department thickness, m；

S₂₁Impeller flanging blade exit thickness, m；

S₂₂Impeller flanging lower blade exit thickness, m；

G acceleration of gravity, m²/s；

H lift, m；

N rotating speed, rev/min；

D₂Impeller outlet diameter, m.

9. a kind of double-suction pump impeller both-end edge folding blades V-type cutting construction design method, its feature exists In: actual outside diameter D' after the cutting of impeller blade exit₂Determined by below equation:

D'₂=D₂-(0.1b₂₁+b₂₂)tanθ

In formula:

D'₂Actual outside diameter after the cutting of impeller blade exit, m；

D₂Impeller outlet diameter, m；

b₂₁Blade exit width, m；

b₂₂Lower blade exit width, m；

θ impeller blade exit cutting angle, scope 0 °～15 °.