CN116292407A - Design method of lightweight pump shell of small dredging pump - Google Patents

Design method of lightweight pump shell of small dredging pump Download PDF

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Publication number
CN116292407A
CN116292407A CN202310095324.7A CN202310095324A CN116292407A CN 116292407 A CN116292407 A CN 116292407A CN 202310095324 A CN202310095324 A CN 202310095324A CN 116292407 A CN116292407 A CN 116292407A
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Prior art keywords
pump
impeller
pump shell
plate
spiral
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Inventor
庄海飞
王文魁
刘明明
王海荣
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 CN202310095324.7A priority Critical patent/CN116292407A/en
Publication of CN116292407A publication Critical patent/CN116292407A/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
    • 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
    • F04D29/2233—Construction and assembly entirely open or stamped from one sheet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The invention relates to the technical field of hydraulic design of small dredging slurry pumps, in particular to a method for designing a lightweight pump shell of a small dredging pump. In order to reduce the weight of the dredging pump with the hanging type digging arm, simplify the manufacturing process and improve the maintenance convenience, a light pump shell design method of the small dredging pump is provided, a pump shell adopts a steel plate welding design, a pump shell runner adopts an equiangular spiral shape, a spiral line wrap angle is 315-335 degrees, a tongue isolation placing angle is 25-45 degrees, and a pump shell runner section adopts a round rectangle. The pump shell flow channel molded line of the centrifugal pump is designed into an equiangular spiral line, which accords with the liquid flow rule; the pump shell outlet is enclosed into a regular octagonal shape by a back plate, a front plate, a side plate and 4 triangular plates and is welded with a circular flange. Compared with a cast pump shell, the steel plate welded pump shell is light in weight, short in manufacturing period, simple to manufacture and convenient to maintain, is suitable for the dredging pump of the arm-digging and mounting type multifunctional dredging device, improves the maintenance efficiency of the dredging pump for site construction, reduces the downtime and improves the dredging efficiency.

Description

Design method of lightweight pump shell of small dredging pump
Technical Field
The invention relates to the field of hydraulic design of slurry pumps, and belongs to the technical fields of centrifugal pumps, fluid mechanics and the like.
Background
The small-sized slurry pump is widely used for dredging and dredging projects of rivers, lakes, ponds and shoals, wherein one dredging pump is arranged on a dredging arm of a dredging ship or an excavator, the weight of the pump is required to be reduced as much as possible by the dredging arm mounting type dredging pump, in a pump body structure, the weight of a pump shell is maximum, the thickness of the pump shell is usually larger than 20mm due to the fact that the pump shell is limited by the minimum casting thickness, the weight of the pump shell is large due to the fact that the thickness of the pump shell is larger than 20mm, and the casting needs the processes of mold processing, casting cooling and the like, so that the manufacturing period is long, the cost is high, and replacement and maintenance after the pump shell is damaged are not facilitated.
Disclosure of Invention
The invention provides a design method of a lightweight pump shell of a small dredging pump, which can lighten the weight of the pump shell, simplify the manufacturing process, reduce the cost and facilitate maintenance.
In order to overcome the problems in the background art, in order to reduce the weight of the pump shell of the dredging pump and reduce the manufacturing, processing and maintenance cost, the pump shell is designed into a steel plate welding structure, the runner molded line is an equiangular spiral line, and compared with a cast pump shell, the pump shell has the advantages of simplifying the processing technology, reducing the manufacturing cost and improving the maintenance convenience.
The technical scheme to be protected of the invention is as follows:
a design method of a lightweight pump shell of a small dredging pump is characterized in that the pump shell is formed by welding a rear plate (1), a side plate (2), a front plate (3), a triangular plate (4) and an outlet flange (5) and is a spiral pump shell of a cantilever centrifugal pump.
The spiral pump shell is characterized in that a spiral section of the pump shell is designed into an equiangular spiral line-shaped flow channel, the wrap angle of the spiral section is 315-335 degrees, the placement angle of the separating tongue is 25-45 degrees, and a diffusion section of the pump shell is tangent to the spiral section. The width of the equiangular spiral line-shaped 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 lining plates, and the section of the equiangular spiral line-shaped flow channel is a fillet rectangle; the wall profile equation for the helical segment is as follows:
Figure BDA0004071495670000011
wherein r is 3 Taking the impeller radius which is 1.03-1.08 times as large as the base radius of the pump shell, and the unit is mm; θ is the angle of the spiral in the circumferential direction, α is the pitch angle, also the start of the spiral, (α is in the embodiment shown in fig. 1, specifically 36 °), section 8 is the end of the spiral,
Figure BDA0004071495670000012
is the spiral wrap angle, (-)>
Figure BDA0004071495670000013
In the embodiment of fig. 1, 324 °), r (θ) is the distance from any point on the spiral line to the center of the pump, in mm.
The flow passage section of the spiral section is a round rectangle, and the section height h is r (theta) and the base radius r 3 Is welded to a fillet of 5mm.
The front plate (3) is formed by cutting a steel plate according to an outer edge line, and has an inner diameter D 3 The method comprises the steps of carrying out a first treatment on the surface of the Inner diameter D of rear plate (1) 5 The value is 150-200mm, and the rest is the same as the front plate;
let the width of the pump shell flow channel be B 3 The side plate (2) is formed by a width B 3 Is bent according to the outer edge shape of the front plate or the rear plate, and the width B of the pump shell flow channel 3 The value is the sum of the width of the impeller outlet and the thickness of the impeller cover plate, and the clearance between the impeller and the front and rear wall surfaces. When the design is carried out, the thickness value of the front cover plate and the rear cover plate of the impeller is 10-20mm, the total clearance value between the cover plate of the impeller and the two side wall surfaces is 5mm, the impeller is a centrifugal impeller, and the number of blades is 3-5.
The final pump shell is obtained by welding a rear plate (1), a side plate (2), a front plate (3), a triangular plate (4) and an outlet flange (5), the outlet of the pump shell is in a regular octagon shape and is internally tangent to the inner diameter of the outlet flange, and the inner diameter of the outlet flange of the pump shell is equal to the width of the pump shell.
The dredging pump shell obtained by the design method is applied to the construction of environment-friendly dredging engineering. In practice, the lightweight dredging pump shell of the invention is provided with a centrifugal impeller, and forms a centrifugal pump cavity together with a pump cover and a shaft seal device. The pump shaft is connected with the impeller hub through a key or a thread. The pump housing is supported and fixed by a bearing housing bracket.
The pump shell adopts a steel plate welding structure, so that the weight of the pump shell is reduced, and the molded line of the flow channel is an equiangular spiral line; the pump shell design method can simplify the design and manufacture of the small pump shell and is convenient for equipment maintenance.
Drawings
FIG. 1 is a schematic view of a pump casing flow channel spiral profile.
Fig. 2 is a plan view of a spiral line of a pump case flow passage.
Fig. 3 is a dimensional view of the pump housing outlet steel plate.
FIG. 4 is a schematic cross-sectional view of a pump housing flow passage.
Fig. 5 is a two-dimensional view of the back plate.
Fig. 6 is a three-dimensional view of the pump casing.
FIG. 7 is a three-dimensional exploded view of the pump casing, 1-back plate, 2-side plate, 3-front plate, 4-triangle, 5-outlet flange.
Fig. 8 is a graph showing the clean water performance of the mud pump of this example.
Detailed Description
A design method of a lightweight pump shell of a small dredging pump is characterized in that the pump shell is formed by welding a rear plate (1), a side plate (2), a front plate (3), a triangular plate (4) and an outlet flange (5) and is a spiral pump shell of a cantilever centrifugal pump.
The spiral section of the pump shell is an equiangular spiral line-type flow channel, the wrap angle of the spiral section is 315-335 degrees, the tongue-separating placing angle is 25-45 degrees, and the diffusion section is tangent to the spiral section. The flow channel width is the sum of the flow channel width of the impeller and the thickness value of the front cover plate and the rear cover plate of the impeller and the clearance value of the cover plate and the lining plate of the impeller, and the flow channel section is a round rectangle; the wall profile equation for the helical segment is as follows.
Figure BDA0004071495670000031
Wherein r is 3 Taking the impeller radius which is 1.03-1.08 times as large as the base radius of the pump shell, and the unit is mm; θ is the angle of the spiral line in the circumferential direction, α is the tongue-separating setting angle, and is also the starting point of the spiral line, 36 ° in fig. 1, the end point of the spiral line, i.e. the 8 th section,
Figure BDA0004071495670000032
the spiral wrap angle is 324 degrees in fig. 1, and r (θ) is the distance from any point on the spiral to the center of the pump in mm.
The flow passage section of the spiral section is a round rectangle, and the section height h is r (theta) and the base radius r 3 Is welded to a fillet of 5mm.
The front plate (3) is formed by cutting a steel plate according to an outer edge line, and has an inner diameter D 3 The method comprises the steps of carrying out a first treatment on the surface of the Inner diameter D of rear plate (1) 5 The value is 150-200mm, and the rest is the same as the front plate; the side plate (2) is formed by a width B 3 Is bent according to the outer edge shape of the front plate or the rear plate, and the width B of the pump shell flow channel 3 The value is the sum of the width of the impeller outlet and the thickness of the impeller cover plate, and the clearance between the impeller and the front and rear wall surfaces. The thickness of the front cover plate and the rear cover plate of the impeller is 10-20mm, the total clearance between the cover plates of the impeller and the two side wall surfaces is 5mm, the impeller is a centrifugal impeller, and the number of blades is 3-5.
The pump shell flow channel molded line of the centrifugal pump is designed into an equiangular spiral line, which accords with the liquid flow rule; the pump shell outlet is enclosed into a regular octagonal shape by a back plate, a front plate, a side plate and 4 triangular plates and is welded with a circular flange.
The final pump shell is obtained by welding a rear plate (1), a side plate (2), a front plate (3), a triangular plate (4) and an outlet flange (5), the outlet of the pump shell is in a regular octagon shape and is internally tangent to the inner diameter of the outlet flange, and the inner diameter of the outlet flange of the pump shell is equal to the width of the pump shell.
The dredging pump shell obtained by the design method is applied to the construction of environment-friendly dredging engineering. In practice, the lightweight dredging pump shell of the invention is provided with a centrifugal impeller, and forms a centrifugal pump cavity together with a pump cover and a shaft seal device. The pump shaft is connected with the impeller hub through a key or a thread. The pump shell is supported and fixed by a bearing box bracket (the connecting mode of all the components is the prior art).
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
examples
FIG. 1 shows a pump casing spiral profile, impeller diameter D 2 500mm of base diameter D of pump housing 3 D is taken out 2 1.06 times, D 3 530mm; according to the spiral section wall profile equation (1), when
θ=36°,45 °,90 °,135 °,180 °,225 °,270 °,315 °,360 °, the linear polar coordinates of the 8 sections are calculated as follows. Diameter D of pump housing outlet 4 And the width B of the pump shell flow channel of FIG. 4 3 Equal, i.e. D 4 ＝B 3 ＝175mm。
Figure BDA0004071495670000033
Figure BDA0004071495670000041
Fig. 2 shows a plan view of a spiral profile, according to which spiral portions of the front, rear and side plates of the pump housing are produced.
FIG. 3 shows the steel plate size, a, D of the pump housing outlet 4 Is 0.2929 times, i.e. 51.3mm.
As shown in FIG. 4, the section of the spiral section flow channel of the pump casing of the embodiment of the invention is a rectangular section, wherein the diameter of the impeller suction port is 250mm, the width of the impeller flow channel outlet is 130mm, the thicknesses of the front cover plate and the rear cover plate of the impeller are 20mm, the total gap between the impeller and the pump cavity is 5mm, and the width B of the pump casing flow channel 3 =130+20+20+5=175 mm. The section height h is r (theta) and the base radius r 3 See table above for differences in (c). The radius r of the fillet of the rectangular section is 5mm.
FIG. 5 shows a rear plate of the pump casing, D 5 The value is 180mm, and other dimensions are the same as those of the front plate 3And the same is true.
Fig. 6 shows a three-dimensional model of a pump casing, with welded connection between steel plates.
Fig. 7 shows an exploded view of a three-dimensional model of a pump casing, and is welded in the order of a rear plate 1, a side plate 2, a front plate 3, a triangular plate 4, and an outlet flange 5. The front plate 3 is thickened by 14mm from fig. 1. The side plate 2 was bent in advance in accordance with the shape of the outer edge line of the front plate, and had a thickness of 14mm.
FIG. 8 shows a performance curve of the mud pump according to the embodiment of the invention, the rotation speed is 1000rpm, and the flow is 900m 3 And/h, the lift is 30m, and the efficiency is 75%.
The present invention is specifically described above, but the present invention is not limited to the above-described embodiments, and other embodiments and modifications within the scope of the present invention are also included.

Claims (8)

1. A design method of a lightweight pump shell of a small dredging pump is characterized in that the pump shell is formed by welding a rear plate (1), a side plate (2), a front plate (3), a triangular plate (4) and an outlet flange (5) and is a spiral pump shell of a cantilever type centrifugal pump.
2. A method of designing a lightweight pump casing for a small dredge pump as claimed in claim 1, wherein the spiral pump casing has a spiral section designed as an equiangular spiral flow path, a spiral section wrap angle of 315 ° -335 °, a tongue-separating setting angle of 25 ° -45 °, and a diffuser section tangential to the spiral section. The width of the equiangular spiral line-shaped 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 lining plates, and the section of the equiangular spiral line-shaped flow channel is a fillet rectangle; the wall profile equation for the helical segment is as follows:
Figure FDA0004071495580000011
wherein r is 3 Taking the impeller radius which is 1.03-1.08 times as large as the base radius of the pump shell, and the unit is mm; θ is the angle of the spiral line in the circumferential direction, α is the setting angle of the isolation tongue, and is the start of the spiral lineThe point is that the spiral line end, namely the 8 th section is the end point,
Figure FDA0004071495580000012
and r (theta) is the distance from any point on the spiral line to the center of the pump, and is the unit mm.
3. The method for designing a lightweight pump casing of a small dredging pump as claimed in claim 2, wherein the flow passage section of the spiral section is a rounded rectangle, and the section height h is r (θ) and the base radius r 3 Is welded to a fillet of 5mm.
4. A lightweight pump casing design method for a small dredging pump as claimed in claim 2, characterized in that the front plate (3) is cut from steel plate according to the outer edge line, the inner diameter D 3 The method comprises the steps of carrying out a first treatment on the surface of the Inner diameter D of rear plate (1) 5 The value is 150-200mm, and the rest is the same as the front plate.
5. The method for designing a lightweight pump casing for a small dredging pump as recited in claim 2 wherein the pump casing flow passage width is B 3 The side plate (2) is formed by a width B 3 Is bent according to the outer edge shape of the front plate or the rear plate, and the width B of the pump shell flow channel 3 The value is the sum of the width of the impeller outlet and the thickness of the impeller cover plate, and the clearance between the impeller and the front and rear wall surfaces; the thickness of the front cover plate and the rear cover plate of the impeller is 10-20mm, the total clearance between the cover plates of the impeller and the two side wall surfaces is 5mm, the impeller is a centrifugal impeller, and the number of blades is 3-5.
6. The method of claim 2, wherein the pump housing outlet is a regular octagon inscribed on the inner diameter of the outlet flange, and the inner diameter of the outlet flange is equal to the width of the pump housing.
7. A lightweight pump housing design method for a small dredging pump as claimed in claim 2, wherein α is specifically 36 °.
8. A lightweight pump housing design method for a small dredging pump as claimed in claim 2, wherein,
Figure FDA0004071495580000013
specifically 324.
CN202310095324.7A 2023-02-06 2023-02-06 Design method of lightweight pump shell of small dredging pump Pending CN116292407A (en)

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Application Number Priority Date Filing Date Title
CN202310095324.7A CN116292407A (en) 2023-02-06 2023-02-06 Design method of lightweight pump shell of small dredging pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310095324.7A CN116292407A (en) 2023-02-06 2023-02-06 Design method of lightweight pump shell of small dredging pump

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Publication Number Publication Date
CN116292407A true CN116292407A (en) 2023-06-23

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