CN102410248A - Method for designing open impeller of no-plug crushing pump - Google Patents

Abstract

The invention relates to a method for designing an open impeller of a no-plug crushing pump. The method provides design formulas of main geometric parameters, such as an external diameter, an exit width, an inlet setting angle, an exit setting angle and a blade wrapping angle of the blade. According to the open type impeller designed by using the method disclosed by the invention, the flowing situation can be improved, and the pumping head, the efficiency and the operational reliability of the no-plug pump are improved.

Description

A kind of unshrouded impeller design method of not having the obstruction macerator pump

Technical field

The present invention relates to a kind of design method of major part of Non-blinding pump, particularly a kind of with the unshrouded impeller design method of pulverizing the function Non-blinding pump.

Background technique

At present, known unshrouded impeller is that Non-blinding pump is used more impeller form.Non-blinding pump can only move in very narrow range of flow, when conveying contains the many liquid of foreign material, is easy to overpower and causes burn-down of electric motor.Pulverize the function Non-blinding pump for band; The cutting knife dish is equipped with at its impeller inlet place, needs to consume a part of power of pump, and lift of pump, flow and efficiency characteristic all can be affected; Have decline to a certain degree; The Non-blinding pump total power consumption can be higher, and it is lower to cause band to pulverize the reliability of function Non-blinding pump, big limitations the using scope of Non-blinding pump.

Impeller is the most crucial parts that influence pump performance; Unshrouded impeller is again that Non-blinding pump is used more impeller form, therefore, and when the design band is pulverized the Non-blinding pump unshrouded impeller of function; Should improve mobilely as far as possible, improve lift, efficient and operational reliability that band is pulverized the function Non-blinding pump.

Summary of the invention

For addressing the above problem, the invention provides a kind of window and pulverize function Non-blinding pump unshrouded impeller design method.Confirm method through improving the several important design parameter of unshrouded impeller, improve mobility status, raise the efficiency.And then improve and be with the operational reliability of pulverizing the function Non-blinding pump.

Realize the design method that above-mentioned purpose adopted:

1, the external diameter of impeller

The formula of impeller outer diameter:

${\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HSA00000607634200012.png"\; state="\{\{state\}\}">D</figure-callout>}}_2=9.35\&CenterDot;(1+\frac{n_s-100}{0.95\&times;{10}^5})\&CenterDot;{\left(\frac{n_s}{100}\right)}^{-0.563}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

In the formula: D ₂-impeller outer diameter, rice;

The flow of Q-design conditions, cube meter per second;

The n-wheel speed, rev/min;

n _s-specific speed.

2, blade exit width

Blade exit width formula:

$b_2=0.64(1-\frac{n_s-135}{4\&times;{10}^5}){\left(\frac{n_s}{100}\right)}^{0.85}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

In the formula: b ₂-impeller blade exit width, rice;

The flow of Q-design conditions, cube meter per second;

The n-wheel speed, rev/min;

n _s-specific speed.

3, blade import laying angle

Blade exit laying angle β ₁=35 °～55 °, specific speed is got big value for a short time.

4, blade exit laying angle

Blade exit laying angle β ₂=12 °～21 °, specific speed is got big value for a short time.

5, subtended angle of blade

Subtended angle of blade

The invention has the beneficial effects as follows: impeller can improve mobility status, improves lift and efficient that band is pulverized the function Non-blinding pump, and improves the operational reliability that band is pulverized the function Non-blinding pump.

The present invention is on probation through the user, and reaction effect is good, can reduce investment outlay effectively, energy saving.

Description of drawings

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

Fig. 2 is same embodiment's impeller blade figure

Among the figure: 1. impeller hub, 2. impeller blade outside diameter, 3. blade, 4. impeller blade exit width, 5. impeller blade import laying angle, 6. impeller blade outlet laying angle 7. subtended angle of blades.

Embodiment

Fig. 1 and Fig. 2 have confirmed this embodiment's impeller shape jointly.It is a kind of unshrouded impeller, and blade (3) root directly is fixed on the impeller hub, and the number of blade 2≤z≤5, can improve mobility status, improves the lift and the efficient of Non-blinding pump, and the operational reliability of Non-blinding pump.The present invention confirms outside diameter (2) D of impeller blade through following relation ₂, impeller blade exit width (4) b ₂, impeller blade import laying angle (5) β ₂, impeller blade outlet laying angle (6) β ₂, impeller blade cornerite (7)

${\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="HSA00000607634200012.png"\; state="\{\{state\}\}">D</figure-callout>}}_2=9.35\&CenterDot;(1+\frac{n_s-100}{0.95\&times;{10}^5})\&CenterDot;{\left(\frac{n_s}{100}\right)}^{-0.563}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

$b_2=0.64(1-\frac{n_s-135}{4\&times;{10}^5}){\left(\frac{n_s}{100}\right)}^{0.85}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

β ₁＝35°～55°；

β ₂＝12°～21°；

Among the figure, the choosing and specific speed n of blade import laying angle (5) and blade exit laying angle (6) _sSize relevant, specific speed is little, blade import laying angle (5) and blade exit laying angle (6) are got big value.Subtended angle of blade is chosen between 140 °～190 ° according to the situation of manufacturing.

Claims (1)

1. one kind is not had the unshrouded impeller design method of stopping up macerator pump, the design formula of blade main geometric parameters external diameter, exit width, import laying angle, outlet laying angle and subtended angle of blade.It is characterized in that: relation below being fit between impeller geometric parameter and the pump design conditions point performance parameter:

$D_2=9.35\&CenterDot;(1+\frac{n_s-100}{0.95\&times;{10}^5})\&CenterDot;{\left(\frac{n_s}{100}\right)}^{-0.563}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

$b_2=0.64(1-\frac{n_s-135}{4\&times;{10}^5}){\left(\frac{n_s}{100}\right)}^{0.85}\&CenterDot;\sqrt[3]{\frac{Q}{n}};$

β ₁＝35°～55°；

β ₂＝12°～21°；

In the formula: the lift of Q-design conditions, rice;

D ₂-impeller outer diameter, rice;

b ₂-impeller blade exit width, rice

β ₁-impeller blade import laying angle, degree;

β ₂-impeller blade outlet laying angle, degree;

The n-wheel speed, rev/min;

n _s-specific speed, rev/min;

-impeller blade cornerite, degree.

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