CN116378999A - Impeller design method for expanding lift range of centrifugal mud pump - Google Patents

Impeller design method for expanding lift range of centrifugal mud pump Download PDF

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Publication number
CN116378999A
CN116378999A CN202310134535.7A CN202310134535A CN116378999A CN 116378999 A CN116378999 A CN 116378999A CN 202310134535 A CN202310134535 A CN 202310134535A CN 116378999 A CN116378999 A CN 116378999A
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China
Prior art keywords
impeller
blades
blade
lift
centrifugal
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CN202310134535.7A
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Chinese (zh)
Inventor
庄海飞
刘明明
武永顶
王文魁
胡京招
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CCCC National Engineering Research Center of Dredging Technology and Equipment Co Ltd
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CCCC National Engineering Research Center of Dredging Technology and Equipment Co Ltd
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Priority to CN202310134535.7A priority Critical patent/CN116378999A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2216—Shape, geometry
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention provides an impeller design method for expanding the lift range of a centrifugal mud pump, which is characterized by comprising the following steps: the flow-through part of the impeller comprises a flow guide cap, blades, a hub, a rear cover plate and a front cover plate, and is a cantilever closed centrifugal impeller; setting conditions; constraining the blade profile equation of each condition; and (5) lofting, processing and manufacturing. The range of the pump lift designed by adopting the series of impellers can reach 65% -130% of rated lift, the range of the pump lift is enlarged, the design process of the blades is simplified, the blade molded lines adopt logarithmic spiral lines, the motion rule of solid particles is met, and the abrasion of the impellers is reduced; the impeller only needs to determine the number of blades, corresponding blade molded lines can be obtained according to molded line equations, the outer diameters of the impeller blades with four different blade numbers are the same, the universality of impeller interchange is guaranteed, and the applicability of the dredger in different construction row pitches is improved by replacing the impeller.

Description

Impeller design method for expanding lift range of centrifugal mud pump
Technical Field
The invention relates to the field of hydraulic design of a dredging mud pump, and belongs to the technical field of spans of dredging mud pumps, hydrodynamics and the like.
Background
The dredge pump is a key device of the dredge boat, when the length (row distance) of the dredge boat's dredge pipeline changes, the lift of the dredge pump is required to be adapted to the pipeline, namely, the lift is low under the working condition of short row distance, and the lift is high under the working condition of long row distance. At present, most dredge boat dredge pumps are directly driven by diesel engines, the rotation speed adjustment is limited, and the lift adjustment range of the dredge boat dredge pump is narrow.
At present, the lift of a dredge boat dredge pump is generally about 80m, and the number of blades is 3, so that the dredge boat dredge pump is suitable for construction in silt soil.
Disclosure of Invention
The invention solves the problem thought: if the impellers of different blades are replaced, the lift of the mud pump is selected, so that the lift matching property of the mud pump under different row pitches is improved, and the dredging construction efficiency of the dredger can be effectively improved.
The following scheme is as follows: in the construction of silt, due to the small solid particle size, the number of alternative blades is increased to 4-6 by properly reducing the impeller passing capacity, and meanwhile, the wrap angle of the blades is properly reduced, so that the blade profile is designed into a logarithmic spiral profile and a blade profile equation is given. The whole technical scheme of the invention can obviously increase the lift of the dredge pump and improve the conveying capacity of the dredge boat in long-row distance.
The technical scheme to be protected of the invention is as follows:
an impeller design method for expanding the lift range of a centrifugal mud pump comprises the following design points:
the key point is as follows: the flow-through part of the impeller comprises a flow guide cap, blades, a hub, a rear cover plate and a front cover plate (the structure of the flow-through part relates to component parts, the position relationship and the connection relationship all belong to the prior art), and the flow-through part is a cantilever closed centrifugal impeller.
And II, setting conditions: the blades are logarithmic spiral type blades, the number z of the blades is 3, 4, 5 and 6, the circumference is uniformly distributed, the thickness of the blades is 60-90 mm, the width of the blade outlet is 40% of the diameter of the impeller suction port, the diameter of the impeller flow passage passing through the maximum sphere is 40%, 32%, 27% and 25% of the diameter of the impeller suction port, and the wrap angle of the blades is measured
Figure BDA0004085030950000011
I.e. the number of leaves 3, 4, 5, 6 corresponds +.>
Figure BDA0004085030950000012
160 °, 140 °, 120 °, 100 °.
And a third key point: the blade profile equation that constrains each of the above conditions is constructed as
Figure BDA0004085030950000013
Figure BDA0004085030950000021
Wherein r is 1 The unit mm is the radius of the suction port of the impeller; θ is the angle of the blade in the circumferential direction, the blade profile inlet is the initial 0 °, and the blade outlet is the end point
Figure BDA0004085030950000022
Figure BDA0004085030950000023
For the blade wrap angle (140 ° in fig. 1 by way of example and not limitation), r (θ) is the distance in mm from any point on the profile to the center of the impeller.
And fourthly, lofting, processing and manufacturing: and finally, lofting and thickening the molded line front cover plate and the rear cover plate to obtain the final blade.
According to the method, the number z of the configuration blades of the dredge pump is controlled within the four impeller type selection ranges of 3, 4, 5 and 6, so that the lift range of the dredge pump is widened, different conveying distances are matched, and the construction pitch range of the dredge is improved.
The significance of the technical scheme of the invention is as follows: according to the impeller design method for expanding the lift range of the centrifugal dredge pump, the lift range of the dredge pump designed by adopting the series of impellers can reach 65% -130% of rated lift, the lift range of the dredge pump is expanded, the design process of the blades is simplified, the blade molded lines adopt logarithmic spiral lines, the movement rule of solid particles is met, and the abrasion of the impellers is reduced; the impeller only needs to determine the number of blades, corresponding blade molded lines can be obtained according to molded line equations, the outer diameters of the impeller blades with four different blade numbers are the same, the universality of impeller interchange is guaranteed, and the applicability of the dredger in different construction row pitches is improved by replacing the impeller.
The technical scheme of the invention is applied: the four sludge pump impellers obtained by the design method are applied to construction of dredgers with different row pitches. When in implementation, the range of the lift of the mud pump is enlarged by only replacing the four cantilever type closed centrifugal impellers, and the inner cavity of the mud pump consists of the cantilever type closed centrifugal impellers and the single-channel pump shell, wherein the inner impeller and the outer pump shell are cast by adopting high-chromium cast iron.
The pump shaft is connected with the impeller hub through threads, an anti-abrasion ring is arranged at the impeller suction port, an anti-abrasion lining is arranged at the suction port, and an anti-abrasion lining plate is arranged between the impeller and the pump cover.
The pump shell is supported and fixed by the lining plate and the pump cover, the section of the pump shell flow channel is in a round rectangle shape, the width value of the pump shell flow channel is the sum of the thickness value of the impeller flow channel and the front and rear cover plates of the impeller and the clearance value of the impeller cover plates and the wear-resistant lining plate, the thickness value of the front and rear cover plates of the impeller is 50-60mm, the total clearance value of the impeller cover plates and the wear-resistant lining plates on two sides is 5mm, and the inner edge and the outer edge of the pump shell are in a spiral line shape.
The impeller blade of the mud pump is designed into a logarithmic spiral type blade, which accords with the motion rule of solid particles and reduces the abrasion of the impeller; the blade design is simple, the range of the pump lift of the mud pump is enlarged, and the impeller of the mud pump can solve the problem of flow regulation of the mud pump under different row spacing working conditions.
The mud pump is provided with four impellers, and has the characteristics of wear resistance and wide range of lift; and under different row spacing working conditions, the rated lift of the dredge pump is 65% -130% times of the lift of the dredge pump, so that the construction applicability of the dredge boat is improved.
Drawings
FIG. 1 is a schematic view of an embodiment impeller shaft projection and blade profile.
Fig. 2 is a view of a three-dimensional impeller part of an example 2"4 vane.
FIG. 3 is a graph of blade profiles in the X-Y plane for four embodiments.
Fig. 4 is a three-dimensional assembly view of a double-shell mud pump.
Fig. 5 is a graph showing the fresh water performance head curve of an example mud pump equipped with four impellers.
1-flow guiding cap, 2-blade, 3-hub, 4-back cover plate, 5-front cover plate, 6-pump shell, 7-abrasion-proof lining plate, 8-large cover, 9-front cover, 10-impeller, 11-impeller suction inlet abrasion-proof ring, 12-shell, 13-bearing cylinder component, 14-pump shaft and 15-bearing seat.
Detailed Description
The technical solutions provided in the present application will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present application are preferably implemented, and are not limited to any form of the present application. The technical features or combinations of technical features described in the embodiments of the present application should not be regarded as isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations may also be included within the scope of the preferred embodiments of the present application, and should be understood by those skilled in the art to which the examples of the present application pertain.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative and not limitative. Thus, other examples of the exemplary embodiments may have different values.
The drawings in the present application are all in a very simplified form and are all to a non-precise scale for the purpose of conveniently and clearly facilitating the description of the embodiments of the present application and are not intended to limit the limitations that the present application may implement. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure disclosed herein without affecting the effects and objectives achieved by the present application. And the same reference numbers appearing in the drawings throughout the application denote the same feature or element, and may be used in different embodiments.
Under the technical scheme framework of the invention, four embodiments are given: example 1, example 2, example 3, example 4 correspond to the numbers of blades z=3, z=4, z=5, z=6, respectively, and the corresponding blade wrap angles are obtained according to equation (2)
Figure BDA0004085030950000031
160 °, 140 °, 120 °, 100 °.
As shown in FIG. 1, the axial plane projection of the impeller flow channel and the blade profile, the diameter D of the impeller suction opening 1 1000mm; according to equation (1), when
Figure BDA0004085030950000032
When (I)>
Figure BDA0004085030950000033
I.e. impeller outer diameter +>
Figure BDA0004085030950000034
D 2 For D 1 2.6 times, D 2 2600mm; impeller runner outlet width B 2 Diameter D of impeller suction opening 1 40% of the impeller flow passage outlet width B 2 400mm; the blade profile coordinates are calculated according to equation (1) as follows. After the blade is lofted by the blade molded line r (theta) to the front cover plate and the rear cover plate, the blade is thickened by 70mm towards the outer edge of the impeller.
Figure BDA0004085030950000041
The flow passing part of the impeller shown in fig. 2 is surrounded by the impeller flow guiding cap 1, the blades 2, the hub 3, the rear cover plate 4 and the front cover plate 5, and the five parts are cast integrally, the impeller is a closed impeller, the blades are shown, and the front cover plate is hidden in the left diagram of fig. 2. The blades 2 are logarithmic spiral blades, the number z of the blades in the embodiment 2 is 4, and the corresponding impeller flow passage passing maximum sphere diameter is 32% of the impeller suction opening diameter respectively.
In the case of examples 1, 3 and 4, the number of blades z was 3, 5 and 6, and the maximum sphere passing diameters were 40%, 27% and 25%, respectively.
Fig. 3 shows a plan view (unit m) of the profile of each impeller in the four embodiments, with coordinates (0, 0) being the center of the impeller.
As shown in fig. 4, the pump shaft 14 is connected with the impeller 10 through a ladder-shaped thread, the impeller 10 is connected with the impeller suction port anti-wear ring 11 through an inner hexagon bolt, the impeller 10 is positioned in a cavity formed by the pump shell 6 and the wear-resistant lining plate 7, the pump shell 6 is fixed on the shell 12 through bolts, the cavity between the pump shell 6 and the shell 12 is filled with high-pressure water to balance the pressure in a mud pump runner, the wear-resistant lining plate 7 is arranged between the impeller 10 and the front cover 9 and between the impeller 10 and the shell 12, the wear-resistant lining plate 7 is connected with the front cover 9 and the shell 12 through bolts, the front cover 9 is connected on the large cover 8 through bolts, the large cover 8 is connected on the shell 12 through bolts, the pump shaft 14 is positioned in the bearing cylinder 13, the bearing cylinder 13 is fixed on the bearing seat 15, and the bearing seat 15 is connected with the shell 7 through bolts, and the bearing seat 15 and the shell 12 are fixed on a hull deck through bolts.
The pump shell flow channel width value takes the sum of the impeller flow channel width, the thickness value of the impeller front and rear cover plates and the clearance value of the impeller cover plates and the wear-resistant lining plates, the thickness value of the impeller front and rear cover plates takes 60mm, the total clearance value of the impeller front and rear cover plates and the wear-resistant lining plates on two sides takes 5mm, namely the pump shell flow channel width value takes 525mm.
FIG. 5 shows a numerical simulation to obtain four example mud pumps of the invention with rated flow 16000m 3 And/h, the lifts of the impellers of the '3 blades', '4 blades', '5 blades', '6 blades' are respectively 80m, 100m, 120m and 130m. Through numerical simulation prediction, the rotating speed is 320rpm, wherein the lift 100m of the rotating speed of a 4-blade impeller is the rated lift, and the lift range of the four impellers designed according to the invention reaches 65-130% of the rated lift in the rated flow rate of the mud pump, so that the lift range of the mud pump is enlarged.
In the field, the lift range of the centrifugal mud pump is adjusted, the common methods mainly comprise impeller cutting, diesel engine rotating speed reduction and the like, and only the lift can be reduced; they are generally known in the art to vary the lift range from 80% to 100%. The four interchangeable impellers of the embodiment of the invention can reach 65-130% of the lift adjusting range, greatly widens the construction pitch range of the dredger, and is rare in the field.
The above description is merely illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any alterations or modifications of the above disclosed technology by those of ordinary skill in the art should be considered equivalent and valid embodiments, which fall within the scope of the present application.

Claims (6)

1. The impeller design method for expanding the lift range of the centrifugal mud pump is characterized by comprising the following design points:
the key point is as follows: the flow-through part of the impeller comprises a flow guide cap, blades, a hub, a rear cover plate and a front cover plate, and is a cantilever closed centrifugal impeller;
and II, setting conditions: the blades are logarithmic spiral type blades, the number z of the blades is four, the circumference is uniformly distributed, the width of the blade outlet is 40% of the diameter of the impeller suction opening, and the wrap angle of the blades has the value phi=20 (11-z);
and a third key point: the blade profile equation that constrains each of the above conditions is constructed as
Figure FDA0004085030930000011
Figure FDA0004085030930000012
Wherein r is 1 The unit mm is the radius of the suction port of the impeller; θ is the angle of the blade in the circumferential direction, the inlet of the blade profile is the initial 0 °, the outlet of the blade is the end point phi, phi is the wrap angle of the blade, and r (θ) is the distance from any point on the profile to the center of the impeller, in mm;
and fourthly, lofting, processing and manufacturing: and finally, lofting and thickening the molded line front cover plate and the rear cover plate to obtain the final blade.
2. The impeller design method for expanding the lift range of a centrifugal mud pump according to claim 1, wherein the thickness of the vane is 60-90 mm.
3. The impeller design method for expanding the lift range of a centrifugal mud pump according to claim 1, wherein the number z of the blades is 3, 4, 5 or 6.
4. The impeller design method for expanding the lift range of a centrifugal sludge pump as claimed in claim 3, wherein the number of the blades 3, 4, 5 and 6 is 40%, 32%, 27% and 25% of the diameter of the suction port of the impeller respectively corresponding to the maximum sphere diameter of the impeller flow passage.
5. A method of designing an impeller for enlarging the head range of a centrifugal mud pump as set forth in claim 3, wherein the number of blades 3, 4, 5, 6 corresponds to phi 160 °, 140 °, 120 °, 100 °.
6. The impeller design method for expanding the lift range of the centrifugal dredge pump according to claim 1, wherein the obtained four dredge pump impellers are applied to different-row-pitch construction of dredge ships.
CN202310134535.7A 2023-02-17 2023-02-17 Impeller design method for expanding lift range of centrifugal mud pump Pending CN116378999A (en)

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CN202310134535.7A CN116378999A (en) 2023-02-17 2023-02-17 Impeller design method for expanding lift range of centrifugal mud pump

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Application Number Priority Date Filing Date Title
CN202310134535.7A CN116378999A (en) 2023-02-17 2023-02-17 Impeller design method for expanding lift range of centrifugal mud pump

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