CN204099269U - A kind of Multi-vane type Non-blinding pump impeller - Google Patents

Abstract

The utility model relates to a kind of Multi-vane type Non-blinding pump impeller.Invention provides a kind of Multi-vane type Non-blinding pump method for designing impeller and Non-blinding pump impeller, and the feature of this Non-blinding pump impeller is: Impeller Design becomes half-open Multi-vane type, only has back shroud (2), without front shroud.Blade (1) form is cylindrical, and blade is imported and exported laying angle and is all less than 90 °, vane inlet diameter D _jless, effectively can reduce the eddy loss in impeller inlet region, and this impeller is arranged on (without moving back to rear pump chamber) in pump chamber, when the solid impurity such as long fibre, large particle flows into from pump inlet, under the rotarily driving of impeller, a part enters without phyllocyst, a part enters impeller, and the solid matter major part under the effect of impeller entering impeller directly sends into spiral case, thus reduces the repeatedly circulation of fiber grain thing in pump chamber, reduce blocking up of runner, improve the passing capacity of twister.The utility model structure is simple, operate steadily and efficient, energy-saving effect is remarkable.

Description

A kind of Multi-vane type Non-blinding pump impeller

Technical field

The utility model relates to a kind of Multi-vane type Non-blinding pump impeller, and particularly one is mainly applicable to conveying and has prehensile long fibre, oarse-grained solid, or the Non-blinding pump impeller containing portion gas in conveying flowing medium.Belong to slurry, sewage transport equipment technical field.

Background technique

At present, at conveying paper pulp, during sewage dirt medium, pump usually because being mingled with various large particle in media as well, long fibre causes easily running blocking as impurity such as long plastic optical fibre, bastose, paper pulp fibers, thus affect pump by performance and operational efficiency, reduce the reliability of pump and working life; The fiber be wrapped on impeller not only reduces effective area of passage of pump and results in blockage, and also takes and often shuts down process, and maintenance is frequent, thus affects working efficiency and delay industrial production.Therefore, pump impeller realizes without blocking and high-efficiency operation is the key technology being badly in need of at present solving.

Pump in the market paper pulp fiber, sewage pump structure form more, common product has single Double Channel Pump and rotary flow type pump.Single Double Channel Pump is applicable to the fluid carrying large particle, long fibrous materials, Procedure of Single-channel Pump impeller due to the number of blade be 1, its blade can not be arranged symmetrically with, and balance is poor, and during pump operation, noise and vibration is relatively large; Double Channel Pump balance is slightly better than Procedure of Single-channel Pump, but blade is thicker than general centrifugal blade, and anti-entangling is poor, easily results in blockage, cause pump cisco unity malfunction during conveying elongated fibers, even can motor damage.Rotary flow type pump impeller is generally that impeller is held back in the rear pump chamber of spiral case, and blade is simple prismatic blade shape, can carry the fluid containing solid particle or fiber, also can carry containing gas medium.There is circular flow and through stream in this pump pump chamber, hydraulic loss is comparatively large, and efficiency is often lower, and during the type pump operation, during large discharge district, power easily overloads and causes motor damage simultaneously.

Through retrieval, published patent " a kind of without blocking torque flow pump impeller and without blocking torque flow pump " (application number: 201220259153.4), its blade is prismatic blade shape, and impeller moves back in rear pump chamber, efficiency is lower, and efficient district easily transships, and pump inlet diameter is less, when carrying containing more long stapled medium, cause blocking to a certain degree; Published patent " a kind of half-opened impeller is without blocking cutting pump " (application number: 201120437806.9), it installs the cutter disc for cutting the impurity such as large particle and long fibre in pump inlet place, but this cutter disc device is installed, pump structure becomes complicated, cost increases, during pump operation, cutter disc consumes a part of power, the efficiency of pump, lift and flow is caused to decline, and in pump inlet, cutter disc is installed, pump effective discharge area itself is made to reduce, the passing capacity of pump declines, and causes blocking to a certain degree.

Summary of the invention

For the problems referred to above, the utility model provides a kind of good by performance when carrying long fibre, large particle solid matter, and efficiency is high, the significant Multi-vane type method for designing impeller of energy-saving effect.

In order to solve Problems existing in background technique, the utility model solves the technological scheme that its technical problem adopts and is: provide a kind of Multi-vane type Non-blinding pump method for designing impeller, comprise impeller outlet diameter D ₂, number of blade Z, back blades number, blade pattern, impeller blade width b ₂, impeller inlet diameter D _j, vane inlet laying angle β ₁, blade exit laying angle β ₂, subtended angle of blade θ.

Impeller outer diameter D ₂relation:

$D_2=\frac{60}{\mathrm{\π}\sqrt{\mathrm{\μ}{\mathrm{\η}}_h}}\×\frac{\sqrt{\mathrm{gH}}}{n}$

μ＝v _u2/u ₂

b ₂＝(0.15～0.2)×D ₂

In formula: D ₂-impeller outlet diameter, rice;

The lift of H-design conditions, rice;

N-wheel speed, rev/min;

η _hthe water pump water force efficiency of-design conditions, %;

μ-dimensionless number, refers in particular to interlobate flowing slippage degree;

U ₂-impeller blade outlet peripheral velocity;

V _u2-impeller outlet absolute velocity is at u ₂projection on direction;

The utility model design Multi-vane type impeller, blade is column type vane, efficiency high and be not easy in large discharge district overload, impeller outlet absolute velocity is at u ₂projection v on direction _u2peripheral velocity u is exported with impeller blade ₂the general Non-blinding pump of odds ratio slightly little, described interlobate flowing slippage degree μ value maximum desirable 0.7; The utility model transport pump be large discharge medium, according to the specific speed n of Parameter Calculation _scomparatively large, under large specific speed, the decrease in efficiency of the type pump is obvious, and therefore the type pump hydraulic efficiency is lower than general Non-blinding pump hydraulic efficiency, described η _hvalue gets 0.50 ~ 0.55.

Described impeller is semi-open type, only has back shroud, without front shroud; Described number of blade Z value gets 9 ~ 11, and described blade shape is that cylindrical, described back blades number is corresponding with impeller blade number, and back blades form is corresponding with blade shape.

Described width of blade b ₂scope is the impeller outlet diameter D of 0.15 ~ 0.2 times ₂, described vane inlet laying angle β ₁scope is 50 ° ~ 70 °, described blade exit laying angle β ₂scope is 40 ° ~ 50 °, and described subtended angle of blade scope is 30 ° ~ 45 °.Described vane inlet diameter D _jfor 0.6 ~ 0.8 times of general centrifugal blade inlet diameter calculated value.

The utility model beneficial effect is, compared with traditional non-clogging impeller structure, is not affecting under the prerequisite by performance, increases the number of blade, and blade shape adopts cylindrical, and impeller is arranged in pump chamber, vane inlet diameter D _jless than common centrifugal non-stick pump, the effective work area of impeller blade to medium increases, and efficiency and lift are improved; The utility model non-clogging impeller back shroud is provided with back blades, back blades and pump chamber gap are 0.15 ~ 0.2mm, back blades number is corresponding with impeller blade number and form with form, during pump operation, long fibre and solid particle are through back blades effect, be thrown out of, prevent fiber and solid particle from entering seal ring, play protection seal ring, extend seal ring working life, make pump operation steady; Traditional the type Non-blinding pump blade is prismatic blade, and fluid enters vane inlet, produces very large impact, and the hydraulic loss of inlet is comparatively large, the utility model vane inlet laying angle β ₁be designed to 50 ° ~ 70 °, blade exit laying angle β ₂be designed to 40 ° ~ 50 °, and adopt less subtended angle of blade θ, the design not only take into account contain in fluid elongated fibers, large particle solid passing ability, further improve the flowing state of fluid, reduce fluid to the impact of vane inlet, reduce hydraulic loss.

The Multi-vane type non-clogging impeller structure that the utility model provides is simple, easily manufactures, and installation and maintenance are convenient, long fibre, large particle solid major part directly sends into volute casing without impeller, passing ability and anti-Filament-wound Machine performance good, efficiency is high, pump operation is steady, long service life.

Accompanying drawing explanation

Fig. 1 is the three-dimensional string diagram of Multi-vane type Non-blinding pump impeller leading faces

Fig. 2 is the three-dimensional string diagram of Multi-vane type Non-blinding pump wheel backface

Fig. 3 is blade axis projection and isohypse transversal figure

Fig. 4 is blade isohypse transversal figure

In Fig. 1,1. blade, 2. back shroud, 3. wheel body, 4. axis hole, 5. keyway

In Fig. 2,6. back blades

In Fig. 3, D ₂for impeller outlet diameter, D _jfor vane inlet diameter, b ₂for impeller outlet width

In Fig. 4, θ is subtended angle of blade, β ₁for vane inlet laying angle, β ₂for blade exit laying angle

Embodiment

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail: these accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model is described in a schematic way.

Fig. 1, Fig. 2 are half-open Multi-vane type non-clogging impeller, and it mainly comprises blade (1), back shroud (2), wheel body (3), axis hole (4), keyway (5), back blades (6).Pump is connected with drive motor axle, is installed in spiral case, and when motor rotates, warp beam impeller rotates, and can realize slurry, wastewater media or the conveying containing gas medium.

Impeller outlet diameter D of the present utility model ₂with design point lift H and wheel speed n meet relation:

$D_2=\frac{60}{\mathrm{\π}\sqrt{\mathrm{\μ}{\mathrm{\η}}_h}}\×\frac{\sqrt{\mathrm{gH}}}{n}$

Described interlobate flowing slippage degree μ value maximum desirable 0.7, described η _hvalue gets 0.52 ~ 0.56.

The Impeller Design of preferred embodiment becomes semi-open type structure, it is characterized by and only has back shroud (2), and without front shroud, the back side of back shroud is designed with back blades (6).Impeller blade (1) form design becomes cylindrical, and number of blade Z is 9 ~ 11 pieces.Compared with general prismatic blade shape impeller, efficiency and lift higher, and impeller is not installed and is moved back to rear pump chamber, and anti-entangling can be better, and can improve fluid flow state further.Back blades (6) number is corresponding with blade (1) number, and back blades (6) form is corresponding with blade (1) form; Back blades (6) thickness is equal with blade (1) thickness, and back blades (6) width is 5mm.Described width of blade b ₂scope is the impeller outlet diameter D of 0.15 ~ 0.2 times ₂, described vane inlet laying angle β ₁scope is 50 ° ~ 70 °, described blade exit laying angle β ₂scope is 40 ° ~ 50 °, and described subtended angle of blade θ scope is 30 ° ~ 45 °.Described impeller inlet diameter D _jfor 0.6 ~ 0.8 times of general centrifugal pump.As specific speed n _stime larger, vane inlet laying angle β ₁, blade exit laying angle β ₂, subtended angle of blade θ gets smaller value.Entrance edge of blade and axis being parallel and coplanar.Blade uses special material, through Overheating Treatment, improves and clashes into and wear-resisting property.

Preferred embodiment of the present utility model can be used for the conveying containing long fibre (as wood pulp, secondary stock, straw, plastics, rope), solid particle (as wooden unit, unit of plastic etc.) medium, also can be used for the conveying of air containing fluid, be widely used, operate steadily, nothing blocking property, health prehensile are good, efficiency is high, obvious energy conservation.

Claims (4)

1. a Multi-vane type Non-blinding pump impeller, Non-blinding pump inefficiency, easily blocks, and get off to design the geometric parameter of Non-blinding pump impeller according to lift H, the rated speed n of operating point for design, the main geometric parameters of this pump impeller comprises: impeller outlet diameter D ₂, impeller blade exit width b ₂, impeller inlet diameter D _j, be applicable to following relation between impeller main geometric parameters and operating point for design performance parameter:

μ＝v _u2/u ₂ (2)

b ₂＝(0.15～0.2)×D ₂ (3)

In formula: D ₂-impeller outlet diameter, rice;

The lift of H-design conditions, rice;

N-wheel speed, rev/min;

η _hthe water pump water force efficiency of-design conditions, %;

B ₂-impeller blade exit width, rice;

μ-dimensionless number, refers in particular to interlobate flowing slippage degree;

U ₂-impeller blade outlet peripheral velocity;

V _u2-impeller outlet absolute velocity is at u ₂projection on direction.

2. a kind of Multi-vane type Non-blinding pump impeller as claimed in claim 1, it is characterized in that: the number of blade of design is 9 ~ 11, and blade pattern is cylindrical, subtended angle of blade θ is 30 ° ~ 45 °, vane inlet laying angle β ₁get 50 ° ~ 70 °, blade exit laying angle β ₂get 40 ° ~ 50 °.

3. a kind of Multi-vane type Non-blinding pump impeller as claimed in claim 1, is characterized in that: impeller inlet diameter D _jfor 0.6 ~ 0.8 times of conventional centrifugal pump inlet diameter calculated value, entrance edge of blade and axis being parallel and coplanar.

4. a kind of Multi-vane type Non-blinding pump impeller as claimed in claim 1, it is characterized in that: impeller is half-opened impeller, there is back shroud, without front shroud, there is back blades at the back shroud back side, back blades number and form corresponding with the number of blade and blade shape, back blades thickness is equal with vane thickness, and wide is 5mm.