CN201771794U - Non-overload turbulence pump with cambered blade - Google Patents

Abstract

The utility model relates to a non-overload turbulence pump with a cambered blade, which gives the design formula of such main geometric parameters of the blade as the external diameter, the outlet width, the outlet arrangement angle and the blade wrap angle and the interrelation therebetween. The turbulence pump adopts the blade designed by the method, thereby meeting the requirement that no overload is caused during running within the full head range.

Description

The non-overload vortex pump of band bending blade

Technical field

The utility model relates to fluid machinery, refers in particular to the non-overload vortex pump of band bending blade.

Background technique

At present, what known torque flow pump adopted is the radioactivity impeller, adopts turbulence pump power curve unlimited rising with the increase of flow of this impeller.Therefore, this impeller can only guarantee that torque flow pump moves in very narrow range of flow, if but operating conditions exceeds the range of operation of pump, and may cause motor to burn.But the operating conditions of torque flow pump varies, bigger variation can appear in the pump-unit lift, causes torque flow pump actual conditions point to move in big range of flow.According to statistics, in the engineering submersible pump of reprocessing, its fault has 70% to be caused by overload approximately.Motor caused the reliability of this class pump lower because of overload loses efficacy, and had limited the using scope of torque flow pump greatly.The turbulence pump that this just requires us to design has mild power curve, can move in big range of flow and does not transship.

The main path of head it off was to strengthen the power backup coefficient in the past, on the air horsepower of torque flow pump design point, multiply by a foundation that is not less than 1.4 coefficient as the apolegamy motor, this coefficient causes investment to increase and energy waste obviously greater than the respective value 1.1-1.2 of centrifugal pump.

Summary of the invention

For solving the deficiency of existing torque flow pump performance, the utility model adopts the impeller of band bending blade.The impeller geometric parameter that the utility model adopts not only satisfies the requirement of suitable for casting, also satisfies torque flow pump and move the requirement that can not occur transshipping in the total head scope.Therefore, the capacity of apolegamy motor be can reduce, investment, energy saving reduced.

Realize the technological scheme that above-mentioned purpose adopted:

Turbulence pump adopts the impeller with curved vane, and the major parameter design formula of blade is as follows:

${\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="H2009202557512E00011.png"\; state="\{\{state\}\}">D</figure-callout>}}_2=18\frac{\sqrt{2\mathrm{gH}}}{n{\left(\mathrm{sim}{\mathrm{\&beta;}}_2\right)}^{0.25}};$

$\frac{b_2}{{\mathrm{<figure-callout\; id="2"\; label="D"\; filenames="H2009202557512E00011.png"\; state="\{\{state\}\}">D</figure-callout>}}_2}=0.000575{n_s}^{1.25};$

β ₂＝15°～25°；

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

D ₂-impeller outer diameter, rice;

b ₂-impeller blade exit width, rice;

β ₂-impeller blade outlet laying angle, degree.

The n-wheel speed, rev/min;

n _s-specific speed, rev/min;

-impeller blade cornerite, degree.

Adopt the blade of said method design, have good hydraulic performance, the turbulence pump that has this blade has mild power curve, can move in big range of flow and does not transship.

The beneficial effects of the utility model are: the impeller geometric parameter not only satisfies the requirement of suitable for casting, also satisfy torque flow pump in the total head scope, move can not occur the overload.

The utility model 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 schematic representation of turbulence pump of the band bending blade of one embodiment of the invention

Fig. 2 is same embodiment's an impeller axial plane sectional view

Fig. 3 is impeller blade figure among the embodiment

Among the figure: 1. motor, 2. main shaft, 3. impeller, 4. spiral case, 5. support, 6. back shroud of impeller, 7. impeller blade outside diameter, 8. blade, 9. impeller blade exit width, 10. impeller blade outlet laying angle, 11. impeller cornerites

Embodiment

Fig. 1 and Fig. 2 have determined this embodiment's impeller shape jointly.It is the same with most of centrifugal pump impellers, has back shroud of impeller 6, is a kind of unshrouded impeller.The present invention determines the exit width b of impeller blade by following relation ₂, impeller blade outside diameter D ₂, impeller blade outlet laying angle β ₂With the impeller blade cornerite

Make that the torque flow pump performance satisfies the total head requirement among this embodiment.

In the drawings, blade exit laying angle 10 chooses and specific speed n _sSize relevant, specific speed is big, the outlet laying angle 10 get the small value.Subtended angle of blade is chosen between 150 °～220 ° according to the difficulty or ease situation of casting and sand removal.

In another embodiment shown in Figure 3, the impeller 3 of band bending blade is installed in the spiral case 4, with spiral case outlet place face certain distance is arranged.When diving turbulence pump when operation, the impeller 3 with curved vane can improve the mobility status in the spiral case 4, satisfies torque flow pump and move in the total head scope and can not occur transshipping.

Claims (1)

1. the non-overload vortex pump of band bending blade, the blade main geometric parameters comprises external diameter, exit width, outlet laying angle and subtended angle of blade, it is characterized in that: turbulence pump adopts the impeller of curved vane, is fit to following relation between impeller geometric parameter and the pump design conditions point performance parameter:

β ₂＝15°～25°；

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

D ₂-impeller outer diameter, rice;

b ₂-impeller blade exit width, rice;

β ₂-impeller blade outlet laying angle, degree;

The n-wheel speed, rev/min;

n _s-specific speed, rev/min;

-impeller blade cornerite, degree.

Images