CN102392830A - Blade wide-angle full-adjusting device for mixed (oblique) flow pump - Google Patents

Abstract

The invention discloses a blade wind-angle full-adjusting device for a mixed (oblique) flow pump, belonging to the field of liquid mechanism. The blade wind-angle full-adjusting device has the use of raising efficiency, improving the adaptability of the working condition, and changing the lubricating way. The device comprises two parts, including (1) a hydraulic adjusting device for up and down moving an adjusting rod, and (2) an adjusting mechanism which is a space oblique crossing rod system. In the figure that is the schematic diagram: an operating rod of a component 1 and an operating frame of a component 2 are upwards moved in a certain distance; a lower ball hinge of a component 3 is synchronously upwards shifted in the same distance, and the position of the ball center can be determined, and the position of the ball centre of an upper ball hinge of a component 4 can be determined; on the condition that the length of the upper ball hinge is obtained, and the rotating radius of a crank arm of a component 5 rotated around an axis of a blade of a component 6 is obtained, the rotating angle of the crank arm of the component 5 can be determined, so the component 1 upwards moved is replaced by the component 6 moved in the negative direction. The components 1 and 2 are downwards moved; the component 6 is rotated in the positive direction based on the same principle, so the operating rod up and down moved is replaced by the blade positively and negatively rotated around a longitudinal axis of self, and blade can be dynamically adjusted at wide angle (+4 degrees to -90 degrees). The mechanism is a self-lubricating bearing. By the device disclosed by the invention, the full-adjusting of a two-stage pump can be achieved.

Description

Mix the full controlling device of (tiltedly) stream pump blade wide-angle

Technical field

Mix (tiltedly) stream pump (annotating 1) full controlling device of blade wide-angle, belong to field of fluid machinery,, enlarge the eurytopicity of operating mode, change lubricating system in order to raise the efficiency.The inferior technology of replace introducing and existing technology resource in the protectorate.

This paper so-called " wide-angle is regulated entirely " means that machine do not shut down, when not commutating, blade angle β z is realized the rotation from+4 ° to-90 °, thereby realizes that performance improvement and function expand, and comprises enlarging this improvement of flow adjustment range greatly.

Background technique

The big energy consumption of pump in national economy accounts for 13%-14%, in each field of national economy, irritates aspects such as draining, municipal engineering, power plant's confession circulating water, regional water transfer (south water to north, Dong Shuixi fail), sewage treatment, nuclear power like agricultural, used in a large number.

Mixed flow pump is compared with centrifugal pump with axial-flow pump, the great comparative advantages on its standard is arranged, to its research and development; In the last thirty years; With Japan is representative, begins and has obtained considerable attention and development, and its using scope is to traditional axial-flow pump and the expansion of centrifugal pump field.

Fixed and half regulating type mixed flow pump can not be brought into play whole advantages of mixed flow pump.The mixed flow pump that has only full adjusting, especially wide-angle are regulated mixed flow pump entirely, the significant advantage of mixed flow pump are able to completely, dynamical performance.For example, northeast Large Hydro-Junction engineering uses the mixed flow pump blade to regulate entirely, even if regulation range has only-6 ° to+2 °, a year power saving rate has also reached 15%.(annotating 2) (regulation range is if bigger, and then power savings is bigger), also because its starting characteristic is good, and inrush current is little, and the adapted motor allowance of pump reduces, the capacity of pumping plant electrical network and electric equipment is also corresponding to be reduced, thereby greatly reduces the pumping plant construction investment.Also for example, the electric power plant circulating water pump is because China's summer and winter temperature changes greatly; The generator set of same capacity, the multiplying power scope of circulating water are 50-70 doubly (flow is big), identical cooling object; Summer, condensation water quantity was 15 times (the accent amount is big) in winter; The regulated quantity that present electricity follows pump can only reach 4.3 times, and can only use half adjusting, i.e. the manual adjustment technology.This has just seriously hindered the performance of moving accent mixed flow pump usefulness. and follow the big accent amount pump of pump and so on for electricity, wide-angle is moved conditioning technology, becomes the difficult point that industry is needed breakthrough badly; And the power of motor of a large pump; Generally between 1000-6000kW, later on also can be bigger, visible; Reliable operation, simple in structure, the moving big full regulation technology of mixed-flow of accent scope are for energy-conservation (static energy-conservation and dynamic energy-saving) and the eurytopic extreme significance of operating mode.For this reason, on the south water north be adjusted to opportunity, the country and enterprise have to exchange external inferior technology for promptly so-called " two rod end joint ball bearing ", the regulating method that this is unsatisfactory with huge market (share) cost, fund cost, long-range income cost.

The full regulation technology of mixed flow pump of moving accent scope big (>=45 °) for energy-conservation very important with the operating mode Wide-adaptive, down to this technology and two indexs of hydraulic characteristic, becomes the significant index of a national large pump development level.

To the adjusting of mixed flow pump performance, once or the main method of using have three kinds, 1) speed change regulates (variable-frequency motor is originated in this); 2) preceding stator is regulated; 3) blade angle is regulated entirely, and in these three kinds of modes, blade angle is adjusted to best entirely.(annotating 3)

Three during the last ten years; Both at home and abroad in the process of seeking the rationally reliable full controlling mechanism of mixed flow pump blade; Many forms such as shift fork, worm gear pair, rack-and-pinion, cone gear pair, lever, cross joint axle have been experienced; Their complex structures mostly are furnished with complicated servomotor and superfluous heavy bath lubrication (fill machine oil in the rotor body, structure makes so).Even if two these forms of rod end joint ball bearing of latest generation, the bearing regulation range can not surpass 13 °, and its hub ratio is bigger, and the blade area of passage is less, and hydraulic characteristic need receive great weakening because of regulation structure.What is more important adopts this form, and domestic existing good mixed flow pump hydraulic model all will cancel or change, thereby causes great loss.This situation that is limited by external inferior technology and buries in oblivion domestic resource should stop.

And technology described herein,

1) structurally Xian's refining the most, brief, reliable operation;

2) blade adjustments angle β z=(+4 ° ∽-90 °), regulation range is the wideest, brings lift, and particularly the adjusting quantitative change of flow is big, and energy-saving effect (static state and dynamic) is bigger;

3) existing outstanding hydraulic model need not change, can be directly and technological seamless combination described herein, practice thrift a large amount of hydraulic model development cost;

4) with respect to stator blade with partly regulate mixed flow pump, manufacturing of the present invention is complicated, and cost increases.

Summary of the invention

1 motion of the present invention is a space oblique leverage, sees Fig. 1, the controlling mechanism schematic diagram:

Part 1 operating stem (placing with one heart in the pump shaft) axis and part 6 axis of runner blade oblique in same plane, x=30 °-45 ° of angle of cut Ψ, part 1 operating stem and part 2 operation stands connect firmly, and can in plane P, move up and down; Part 6 blades are the simply supported beam of band cantilever, and two supportings of sharf afterbody lay respectively in the rotor body and on the shell, part 6 blades and part 5 connecting levers link with key, and it can be around self rotational; Ball pivot and part 5 connecting lever pins join on the part 4, can in the M of plane, move; 3 times ball pivots of part and part 2 operation stand pins join, and can in plane P, move; The common part of ball pivot is a space enclosed sphere lower pair on 3 times ball pivots of part and the part 4, has groove on the interior spherical shell, when this groove is upper and lower ball pivot relative movement, by the bar portion that dodges down ball pivot is opened.

The existing translation in the P plane of 3 times ball pivots of part has rotation again; Ball pivot existing translation in the M plane has rotation again on the part 4.

When operating stem and the operation stand segment distance that moves upward, the pin portion of following ball pivot moves this distance synchronously, because of ball pivot length down can know that then sphere center position can be decided, this position also be on the ball pivot sphere center position; Because last ball pivot length is known, connecting lever is known around the radius that axis of runner blade rotates, and then the connecting lever angle of swing can be asked, and then the axle of blade rotates counterclockwise the angle identical with connecting lever, that is to say that moving upward of part 1 operating stem changes rotating counterclockwise of part 6 blades into.Rotation angle can be provided with on request, as β z=+4 °.

When part 1 operating stem and part 2 operation stands move downward, according to aforementioned, can learn moving downward of part 1 operating stem, change clockwise rotating of part 6 blades into.In like manner, rotation angle can be provided with on request, as β z=-90 °.

In the above-mentioned movement process, each of driving link 1 operating stem is confirmed the position, and part 6 blades and middle each part have, and has only a definite position corresponding with it, promptly satisfies the requirement that motion of the present invention maybe be unique with motion.

Motionless when part 1 operating stem, even part 6 blades have rotation trend, whole leverage also is stable.

Regulator places on the pump shaft, thereby adjusting power is set to system's internal force, controlling mechanism is not shown the effect of power outward.Under the requirement of satisfying 0.5 °/s of angle adjustment speed, the linear velocity of operating stem is merely millimeter/s level, and its power is very little, so for the power source of regulating power, only need a micro servo motor.

2 lubricated and sealings

The sphere lower pair of mechanism is used graphite lubrication, adorns black chamber and contacts with ball is secondary, and cut off with periphery;

Blade rotation bearing, pin portion bearing are powder metallurgy oil-impregnated bearing, during design, and according to the load at each position, and the crushing strength of bush material, confirm metal matrix material, select oil-impregnated bearing for use;

Because whole device all together rotates with the transmission shaft of pump, so most of sealing station is a static seal, having only blade rotation place and operating stem shaft place is the motive sealing of mesolow, low speed.

The blade rotary part is with " λ " silicone rubber seal; Adjustable lever shaft place is with common piston rod Y shape rubber seal.

" connecting lever " in 3 mechanisms is Z-shaped folding arm, adopts this form, can make full use of the confined space in the hub, accomplishes structural configuration, also just need not change the rotor body size of existing pump, thereby protect existing hydraulic model not abandoned.Fig. 2 is the structural drawing of mechanism.

4 principles described herein and structure are used for two-stage pump to improve lift, and in the full design of transferring of twin-stage and making, emphasis is not adjustable at twin-stage, and at " synchronously ".For guaranteeing that whole blade angle relative errors reach designing requirement, must make special-purpose inspection utensil.

Description of drawings

Fig. 1 is the machine adjustments mechanism principle figure; Fig. 2 is machine adjustments mechanism structure figure; Fig. 3 is machine web and controlling mechanism 3D solid figure.

Practical implementation

1) bulk of this member constraint can be optimized to satisfy between member is with material, regulator operating oil pressure two key elements;

2) respective amount of corresponding sports relation is a transcendental equation, can set suitable accuracy by actual demands of engineering, as 0.001, calculates and tries to achieve the approximate solution that satisfies requirement of engineering; Also available graphing method is found the solution;

3) component strength and calculating, maximum waterpower of the blade that provides during according to design and Hydraulic Moment are used mechanics of materials fourth strength theory, each rod member is made regular tenacity calculate.

The present invention satisfies the constraint in feasible and unique, the component strength of moving of quantitative relation, the motion of space in the engineering, corresponding sports, the whole reality of feasible process.

Whole theoretical calculation of the present invention and actual the manufacturing, available data and technical equipment all can satisfy.Fig. 3 is the three dimensional design external form figure of real pump.

Annotate:

Annotate 1: the mixed flow pump of band stator is claimed diagonal pumps

Annotate 2: data source: Wuhan University, Xu Yanru, Chen Jian, Eleventh Five-Year Plan national science and technology supporting plan (2006BAD11B07) " analysis of white sand beach pumping plant blade adjustments unit running optimization "

Annotate 3: data source:

" the electric power plant circulating water pump characteristics is regulated and the propeller regulating mechanism design ".

Claims (7)

1. mix the full controlling device of (tiltedly) stream pump blade wide-angle, it is characterized in that: operating stem axis and blade-span axis be oblique in same plane, the operating stem a bit of distance that moves up and down, the blade synchronization of pump around the angle of the forward and reverse rotation setting of self axis.

2. device according to claim 1 is characterized in that: blade can be regulated in+4 ° of ∽-90 ° scopes around self axis angle of rotation.

3. device according to claim 1 is characterized in that: " connecting lever " in the mechanism is Z-shaped folding arm.

4. device according to claim 1 is characterized in that: device comprises enclosed sphere lower pair, has the groove of dodging outer club motion on the secondary ectosphere of ball.

5. device according to claim 1 is characterized in that: the sphere lower pair of device, use graphite lubrication, and adorn black chamber and contact, and cut off with periphery with ball is secondary.

6. device according to claim 1 is characterized in that: the blade rotation bearing of device, pin portion bearing are powder metallurgy oil-impregnated bearing.

7. device according to claim 1 is characterized in that: two-stage pump can be regulated in+4 ° of ∽-90 ° scopes synchronously.

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