CN203627241U - Uniform pitch pulp pump - Google Patents

Abstract

The utility model provides a uniform pitch pulp pump. The inlet equivalent diameter D 0, the inlet tip diameter D y1, and the inlet hub ratio d h1 of an impeller are selected properly to improve the flowing state, and the distance between the outer diameter of a blade rim and a front wearing liner and the distance between the outer diameter of the blade rim and a rear wearing liner are reasonably selected according to the diameter of each medium particle which needs to be conveyed by the pulp pump to solve the problems of blocking, winding and even clamping of the impeller of the pulp pump. The thicknesses of the front wearing liner and the rear wearing liner are both 120%-150% that of the blades of the impeller. The number of the blades is 1-2, the screw pitch between the blades is changed from the inlet edge to the outlet edge in an equivalent pitch mode, and the distance between the blade rim and the front wearing liner and the distance between the blade rim and the rear wearing liner are 1/2 to 1/3 of the thicknesses of the blades respectively. Solid and long fiber type objects can smoothly pass through the impeller, the impeller is prevented from being blocked and clamped, good hydraulic performance is achieved, work efficiency of a pulp pump production line is improved, and the uniform pitch pulp pump can be applied to the paper making industry.

Description

A kind of uniform pitch pulp pump

Technical field

The utility model belongs to pump technical field, especially a kind of Hydraulic Design Method of uniform pitch pulp pump impeller.

Background technique

In paper-making industry production process, carry sewage and paper pulp etc. all will use water pump.Wherein the conveying of paper pulp is most crucial process during papermaking enterprise is produced, and this process must complete by pulp pump.

Pulp pump is a kind of general and special machinery, the medium of carrying due to it mostly is heterogeneous fluid, this just has high requirement to the overcurrent performance of its runner, in addition the rotation of its distinctive runner form and impeller, make pump body flow field have all the time the flow phenomenons such as whirlpool in various degree, secondary back, the separation of flow, this makes pump internal flow become more complicated.The impeller Hydraulic Design Method of traditional pump is the Hydraulic Design based on pump internal pressure distributes, the flowing law in flow field etc. progressively instructs impeller mostly.This method can be used on equally pulp pump and carries in the process of the heterogeneous fluids such as paper pulp, but in the time of pulping and slag removal, have some solid matters and long fibre shape thing is difficult to pass through impeller, and be wrapped on impeller, cause impeller to stop up even stuck phenomenon, cause frequent cleaning, maintenance, whole production line can not normally be moved and working efficiency reduction.

And current existing pulp pump can not effectively solve obstruction, the even stuck problem of winding that operation occurs.Given this, need to design a kind of novel pulp pump impeller.

Summary of the invention

The purpose of this utility model is to provide a kind of uniform pitch pulp pump, so that solid matter and long fibre shape thing can pass through impeller smoothly, the obstruction effectively avoiding occurring, is wound around the problems such as even stuck in running.

In order to solve above technical problem, the concrete technological scheme that the utility model adopts is as follows:

A kind of uniform pitch pulp pump, comprise the pump housing (6), serve as the pump housing (6) protecgulum front wear-resisting lining (1), serve as the rear wear-resisting lining (2) of the pump housing (6) bonnet, the wheel hub (5) that matches with pump shaft (4) and by wheel hub (5) and be arranged on the impeller that the blade (3) on wheel hub (5) forms, it is characterized in that: the thickness of described front wear-resisting lining (1) and described rear wear-resisting lining (2) is 120%～150% of described impeller blade (3) thickness; The quantity of described blade (3) is 1～2 piece, and the pitch between described blade (3) changes by uniform pitch from inlet side to Exit-edge; Described blade (3) wheel rim is respectively 1/2～1/3 of vane thickness apart from the distance of front wear-resisting lining (1) and rear wear-resisting lining (2).

The import equivalent diameter D of described impeller ₀, import tip diameter D _y1, import hub ratio d _h1determine according to formula (I), formula (II), formula (III) respectively

$D_0=K_0\sqrt[3]{\frac{Q}{{\mathrm{n\η}}_v}}---\left(I\right)$

$D_{1y}=\sqrt{{D_0}^2+{d_{h1}}^2}---\left(\mathrm{II}\right)$

$d_{h1}=\frac{d_h}{D_{1y}}---\left(\mathrm{III}\right)$

β _1y＝β' _y1+Δβ _1y，Δβ _1y=4°～8°；

β _2y＝β' _y2+Δβ _2y，Δβ _2y=1.5°～3.5°；

S＝πD _ytanβ _3y/Z，β _3y＝(β _1y+β _2y)/2；

In formula:

D ₀-impeller inlet equivalent diameter, the mm of unit;

K ₀-empirical coefficient, span 4.8～5.5;

D _1y-impeller inlet tip diameter, the mm of unit;

Flow under Q-design conditions, span is 20～200m ³/ h;

η _vthe volumetric efficiency of-pump, span 0.9～0.96;

D _h-hub diameter, the mm of unit;

N-rotating speed, span is 660～1800r/min;

β _1y---inlet blade angle;

β _2y---blade outlet angle;

V _m1---import axis plane velocity;

V _m2---outlet axis plane velocity;

U ₁---import peripheral velocity;

U ₂---outlet peripheral velocity;

V _u2---the peripheral compoent of velocity;

---blade sweepback angle, span is 80 °～150 °;

---blade wheel hub cornerite;

---blade rim cornerite.

The utlity model has beneficial effect.The utility model is by controlling the inlet diameter equivalent D of pulp pump impeller ₀, import tip diameter D _y1, import hub ratio d _h1, improve flowing state, simultaneously carry out spacing between choose reasonable blade rim external diameter and front and back wear-resisting lining and improve obstruction, the even stuck problem of winding of pulp pump impeller according to the medium of the required conveying of pulp pump.In design pulp pump impeller process, adopt the design method of uniform pitch, utilize the spiral performance of blade self to make the medium of the spiral fiber being easily wound around comply with the flowing law of blade self, thereby greatly reduce the even stuck problem that is wound around, make solid matter and long fibre shape thing smoothly by impeller, improved to a great extent the working efficiency of whole production line.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model impeller.

Fig. 2 is the plan view of the utility model impeller.

In figure: wear-resisting lining before 1-, wear-resisting lining after 2-, 3-blade, 4-pump shaft, 5-wheel hub, the 6-pump housing.

Embodiment

Below in conjunction with drawings and the specific embodiments, the utility model is further described, but protection domain of the present utility model is not limited to this.

The structure of a kind of uniform pitch pulp pump impeller the utility model proposes as shown in Figure 1; Plan view is as Fig. 2

Shown in.

Embodiment's design conditions flow Q=120m ³/ h, lift H=30m, rotating speed 1480r/min.

The utility model is determined impeller inlet equivalent diameter D by given several relations once ₀, import tip diameter D _y1, import hub ratio d _h1:

Determine the inlet diameter D of impeller by formula (I), formula (II), formula (III) _j, outlet diameter D ₂, blade exit width b ₂:

$D_0=K_0\sqrt[3]{\frac{Q}{{\mathrm{n\&eta;}}_{\mathrm{<figure-callout\; id="3"\; label="v"\; filenames="131219135712.png,131219135716.png"\; state="\{\{state\}\}">v</figure-callout>}}}}=183.5\mathrm{mm},$ K ₀value taken is 5;

$D_{1y}=\sqrt{{D_0}^2+{d_h}^2}=200\mathrm{mm}$

$d_{h1}=\frac{d_h}{D_{1y}}=80/200=0.4$

In formula:

D ₀-impeller inlet equivalent diameter, D ₀=183.5mm;

D _1y-impeller inlet tip diameter, D _1y=200mm;

D _h1-impeller inlet hub ratio, d _h1=0.4;

η _vthe volumetric efficiency of-pump, gets 0.95;

D _h-hub diameter, gets 80mm.

Determine the turnover bicker of impeller blade

v _m1=2.62m/s，u ₁=15.11m/s)，β _y1'=10.2°；

Add the inlet blade angle β after inlet incidence angle _1y=β ' _y1+ Δ β _1y10.2 °+1.8 °=12 °;

(v _m2=2.6m/s，u ₂=15.11m/s,v _u2=2.67m/s)β _y2'=11.7°；

Add the blade outlet angle β after the outlet angle of attack _2y=β ' _y2+ Δ β _2y=11.7 °+2.3 °=14 °

Determine blade pitch and also blade rim cornerite wheel hub cornerite

Blade pitch: S=π D _ytan β _3y/ Z=46.5, β _3y=(β _1y+ β _2y)/2=13 °;

Blade rim cornerite

get 235 °;

Blade wheel hub cornerite

Get number of blade Z=1.

Be a designed embodiment of Hydraulic Design Method of uniform pitch pulp pump impeller described in the utility model as shown in Figure 1 and Figure 2, before and after described impeller blade, the thickness of wear-resisting lining is 150% of impeller blade thickness, and interlobate pitch changes by uniform pitch from inlet side to Exit-edge; Wherein blade rim is vane thickness apart from the distance of front and back wear-resisting lining 1/2.As shown in Figure 1, paper pulp flows into through designed impeller action from pump inlet the working procedure of the utility model device, finally flows out from pump discharge.

Described embodiment is preferred embodiment of the present utility model; but model utility is not limited to above-mentioned mode of execution; in the situation that not deviating from flesh and blood of the present utility model, any apparent improvement, replacement or modification that those skilled in the art can make all belong to protection domain of the present utility model.

Claims (1)

1. a uniform pitch pulp pump, comprise the pump housing (6), serve as the pump housing (6) protecgulum front wear-resisting lining (1), serve as the rear wear-resisting lining (2) of the pump housing (6) bonnet, the wheel hub (5) that matches with pump shaft (4) and by wheel hub (5) and be arranged on the impeller that the blade (3) on wheel hub (5) forms, it is characterized in that: the thickness of described front wear-resisting lining (1) and described rear wear-resisting lining (2) is 120% ~ 150% of described impeller blade (3) thickness; The quantity of described blade (3) is 1 ~ 2 piece, and the pitch between described blade (3) changes by uniform pitch from inlet side to Exit-edge; Described blade (3) wheel rim is respectively 1/2 ~ 1/3 of vane thickness apart from the distance of front wear-resisting lining (1) and rear wear-resisting lining (2).

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