CN108331763B - Design realization method of durable mud pump with prolonged service life - Google Patents
Design realization method of durable mud pump with prolonged service life Download PDFInfo
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- CN108331763B CN108331763B CN201810161105.3A CN201810161105A CN108331763B CN 108331763 B CN108331763 B CN 108331763B CN 201810161105 A CN201810161105 A CN 201810161105A CN 108331763 B CN108331763 B CN 108331763B
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- volute
- suction surface
- thickness
- mud pump
- abrasion
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000002035 prolonged effect Effects 0.000 title abstract description 8
- 238000005299 abrasion Methods 0.000 claims abstract description 26
- 230000008719 thickening Effects 0.000 claims abstract description 18
- 238000005192 partition Methods 0.000 claims abstract description 17
- 210000002105 tongue Anatomy 0.000 claims description 17
- 239000013049 sediment Substances 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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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
- 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
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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
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/306—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the suction side of a rotor blade
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- 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
Landscapes
- 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 a design realization method of a durable mud pump with prolonged service life, and belongs to the technical field of mud pump design. The invention reasonably thickens the position with serious stress concentration and abrasion on the basis of the original design of the mud pump so as to prolong the service life of the mud pump; the method mainly comprises thickening local areas of a volute and an impeller, wherein the thickening of the volute is mainly carried out by thickening a partition tongue with serious abrasion and a volute shaft section, and the wall thickness of each section is adjusted according to the severity of the abrasion of the partition tongue and each shaft section; the thickening of the impeller is on the suction surface of the blade, mainly thickening the suction surface of the blade near the inlet and outlet edges, and the region is also the region with abrasion and stress concentration. The mud pump designed by changing the wall thickness has longer service life, and can avoid the phenomenon that the mud pump cannot work normally due to the phenomenon of grinding through or breakage at the local position.
Description
Technical Field
The invention belongs to the field of mud pump design, and relates to a design realization method of a durable mud pump with prolonged service life, which is used for carrying out local thickening aiming at the failure characteristic of each part in the mud pump.
Background
The dredge pump is a key ring in dredging engineering, the dredge materials of the dredge pump have complex and various components, some of the dredge materials contain gravels or sharp rock blocks with larger particle sizes, and the dredge materials can seriously damage the dredge pump in the process of colliding with the dredge pump; some are clay sand or clay gravel, so that the mud pump is easy to wear rapidly; some are medium coarse sand, which is easy to cause abrasion of the mud pump. Depending on the flow of sediment in the pump, it can be found that the wear in the mud pump is uneven and can be extremely severe in localized areas. Meanwhile, the internal pressure of the mud pump is unevenly distributed when the mud pump works, so that the stress of each part of the mud pump is different, and the stress concentration phenomenon can be generated in a local area. The service life of the areas with serious abrasion and stress concentration is the service life of the mud pump.
At present, the design of the mud pump adopts a design method with the same wall thickness, when the local area of the mud pump is damaged by failure, although other most areas still can meet the use requirement, only the failed parts of the mud pump can be replaced, and particularly when the impeller or the volute is damaged by failure, the replacement of the failed parts is a very complicated matter, which leads to great economic loss and prolonged construction period. At present, the service life is prolonged by using better materials and increasing the overall wall thickness of the mud pump, but the method has low economic benefit and high cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a design and realization method of a durable mud pump with prolonged service life so as to prolong the service life of an easily worn area and a stress concentration area of the mud pump.
In order to achieve the above object, the present invention provides the following technical solutions:
the finite element calculation is carried out on the solid-liquid two-phase flow in the mud pump through an Euler-Lagrange equation, the abrasion condition in the mud pump can be obtained by adding a fine erosion equation on the basis, the areas with serious abrasion of the volute (the mud pump shell) are found to be the partition tongue, the bottom area and the two side areas of the volute, and the abrasion of the top area and the outlet area of the volute is less, because the impact of sediment on the bottom area and the obliquely lower area of the volute under the influence of gravity is more, the impact on the top area of the volute is less, and the abrasion of the partition tongue is because a large amount of sediment is necessary to impact the partition tongue before the sediment flows out of the volute; the silt gradually diffuses in the volute, the flow speed is reduced, the flow speed at the outlet position of the volute is lower, and the abrasion of the area is also less.
The design of the volute casing is carried out on the basis of the hydraulic design of the volute, the volute is divided into a plurality of shaft sections by taking the center of a base circle as the axis on a plan view of the hydraulic design of the volute, the wall thickness of each shaft section adopts a non-uniform thickening design method according to the abrasion condition in the volute, and the abrasion of the partition tongue is most serious, the abrasion of the bottom area and the two side areas of the volute is more serious, the abrasion of the outlet area and the top area of the volute is less, so the wall thickness of the partition tongue is designed to be the largest, and the thicknesses of the outlet area and the top area of the volute are only required to be the basic thickness.
And thickening the cross section of each shaft and the partition tongue in the mode, clicking the thickened position on a volute plane, and then smoothly connecting the obtained points to obtain the outer wall surface of the volute.
Further, finite element calculation is carried out on solid-liquid two-phase flow in the mud pump through an Euler-Lagrange equation, a fine erosion equation is added on the basis, stress conditions of all hydraulic components in the mud pump and wear conditions of the mud pump can be obtained, a stress concentration area on an impeller can be found to be the joint of an inlet edge and a front cover plate and a rear cover plate of a blade, a more serious area on the impeller is a blade inlet edge and a blade outlet edge, sediment firstly impacts the inlet edge after entering the impeller, the flow rate of sediment in the impeller is gradually increased, when the sediment flows out of the impeller, the blade outlet edge is impacted, and the inlet and the outlet parts of the blade are worn through due to the reasons, so that the efficiency of the mud pump is greatly reduced.
The area for thickening the impeller is thickened only at the position of about 20% of the inlet and outlet on the suction surface of the blade, so that the influence on the conveying performance of the mud pump is small and the service life of the impeller can be greatly prolonged.
Specifically, in the invention, firstly, the volute is divided into a plurality of shaft sections, and the wall thickness of each shaft section is designed in a non-uniform thickening way according to the serious condition of abrasion in the volute; the abrasion of the partition tongue is the most serious, the abrasion of the bottom and two side areas of the volute is more serious, and the abrasion of the outlet part of the volute and the top of the volute is less, so that the wall thickness of the partition tongue is (1.4-1.5) t, the wall thickness of the bottom and two side areas of the volute is (1.1-1.3) t, and the thickness of the outlet part of the volute and the top area adopts the basic thickness t of the volute casing; when the sediment transported is coarse sand or cannot run in the high-efficiency area for a long time, the thickness of each area takes a larger value in each range. Then, on the plane view of the hydraulic design of the volute, the positions of all the shaft sections, the volute outlets and the partition tongues after increasing the thickness are dotted on the plane view of the volute, and the obtained points are smoothly connected, so that the outer wall surface of the volute is obtained.
By way of example, but not limitation, on a plan view of the hydraulic design of the volute, the volute is divided into 7 shaft sections by taking the center of a base circle as the axis, the volute is thickened according to the line of the plan view of the hydraulic design of the volute, the section thickness sigma of the volute section is different on the 7 volute sections, and the basic thickness t of the housing is calculated first.
And (3) preliminarily determining the basic thickness t of the volute casing according to the parameters such as the diameter of the base circle of the volute, the specific rotation speed, the allowable stress of materials and the like according to a formula (1).
Wherein: t is the basic thickness of the volute casing, and the unit is m; d is the diameter of the base circle of the volute, and the unit is m; [ Sigma ]]Is allowable stress, and the unit is Mpa; n is n s Is a specific rotation speed and is dimensionless; a is the thickness coefficient of the mud pump, and is determined by the following table.
The smaller the diameter D of the base circle of the volute is, the larger the thickness coefficient a is.
When the sediment transported is most silt and fine sand, a takes smaller values in the respective ranges;
when the sediment transported is coarse sand, a takes a larger value in each range.
When the mud pump is designed to convey large-sized particles such as coarse sand, lump stone, etc. for a long period of time, the basic thickness t of the volute casing takes a relatively large value within the respective range.
According to the abrasion condition in the volute, a non-uniform thickening design method is adopted for the wall thickness of each shaft section, wherein the thickness of the position of the shaft section I is t, the thickness of the shaft section II is (1.2-1.3) t, the thicknesses of the shaft section III to the shaft section VI are (1.3-1.4) t, and the thickness of the shaft section VII is (1.1-1.2) t; the thickness of the partition tongue is (1.4-1.5) t. When the sediment transported is coarse sand or cannot run in a high-efficiency area for a long time, the thickness of the section of the shaft takes a larger value in each range, and the thickness at the outlet of the volute is t.
And on a plane view of the hydraulic design of the volute, the positions of the 7 shaft sections, the volute outlet and the partition tongue after the thickness is increased are dotted on the plane view, and the obtained points are smoothly connected, so that the outer wall surface of the volute is obtained.
Further, in the invention, the thickening of the blade is completed by changing the original suction surface molded line of the blade, beta is the radian of the original suction surface molded line, the included angle alpha is the radian of the inlet part molded line of the original suction surface, the circumferential direction of the edge of the inlet of the blade is increased by the thickness b, the value range of b is (0.5-0.8) t, the thickness is gradually reduced along the inlet part molded line of the original suction surface toward the outer edge of the blade, a new inlet part suction surface molded line is formed, and the value of the included angle alpha is (0.15-0.25) beta; the included angle theta is the radian of the outlet part line of the original suction surface, wherein the thickness d of the outlet part line of the original suction surface is increased along the circumferential direction at the outer edge of the blade, the value range of d is (0.8-1) t, the angle theta gradually decreases along the outlet part line of the original suction surface towards the inlet edge of the blade to form a new outlet part line of the suction surface, and the value range of the included angle theta is (0.2-0.25) beta.
Compared with the prior art, the invention has the beneficial effects that:
in practical dredging engineering, the service life of the existing dredge pump is usually only 2 to 4 months, and when a large amount of particles with large particle diameters such as gravels are contained in dredge, the service life of the dredge pump can be greatly reduced, and a construction ship can also take days to replace the dredge pump. The mud pump designed by the invention can prolong the service life of the mud pump by about 40%, and reduce the replacement times of the mud pump.
Drawings
Fig. 1 is a cross-sectional view of a volute.
Fig. 2 is a plan view of the blade.
Fig. 3 is a structural view of the scroll and impeller.
Description of the reference numerals
1-separating tongue; 2-the outer wall surface of the volute; 3-designing a plane figure line by volute hydraulic power; 4-a volute outlet; 5-volute section; 6-blade inlet edge; 7-an original suction surface inlet part molded line; 8-new suction surface inlet part molded line; 9-an original suction surface inlet part molded line; 10-new suction surface outlet part molded line; 11-blade outer edge; 12-an original suction surface molded line; sigma-section thickness; alpha-primary suction surface inlet part molded line radian; theta-original suction surface outlet part molded line radian; beta-is the radian of the original suction surface molded line; b-thickening the width of the inlet edge; d-thickening the width of the outlet edge.
Detailed Description
The technical scheme of the design implementation method of the durable mud pump for prolonging the service life provided by the invention is further described below with reference to specific embodiments and attached drawings. The advantages and features of the present invention will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present invention are preferred embodiments, and are not intended to limit the present invention in any way. The technical features or combinations of technical features described in the embodiments of the present invention should not be regarded as isolated, and they may be combined with each other to achieve a better technical effect. Additional implementations are also included within the scope of the preferred embodiments of the present invention and should be understood by those skilled in the art to which the embodiments of the present invention 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 of the invention are in a very simplified form and are not to scale precisely, but are for the purpose of illustrating embodiments of the invention conveniently and clearly, and are not intended to limit the scope of the invention. Any structural modification, proportional change or size adjustment should fall within the scope of the technical disclosure without affecting the effects and the achieved objects of the present invention. And the same reference numerals appearing in the drawings of the present invention denote the same features or elements, and may be used in different embodiments.
As shown in fig. 1, on a plan view of the hydraulic design of the volute, the volute is divided into 7 shaft sections by taking the center of a base circle as the axis, the volute is thickened according to a plane view line 3 of the hydraulic design of the volute, the section thicknesses sigma on the volute section 5 are different on the 7 volute sections, and the basic thickness t of the housing is calculated according to an equation (1).
When the sediment transported is most silt and fine sand, a takes smaller values in the respective ranges;
when the sediment transported is coarse sand, a takes a larger value in each range.
According to the serious condition of abrasion in the volute, a non-uniform thickening design method is adopted for the wall thickness of each shaft section, wherein the thickness of the position of the shaft section I is t, the thickness of the shaft section II is (1.2-1.3) t, the thicknesses of the shaft section III to the shaft section VI are (1.3-1.4) t, and the thickness of the shaft section VII is (1.1-1.2) t; the thickness at the tongue 1 is (1.4-1.5) t. When the sediment transported is coarse sand or cannot run in a high-efficiency area for a long time, the thickness of the section of the shaft takes a larger value in each range, and the thickness at the outlet of the volute is t.
On the plane view of the volute, the positions of the 7 shaft sections, the volute outlet 4 and the partition tongue 1 after increasing the thickness are dotted on the plane view of the volute, and the obtained points are smoothly connected, so that the volute outer wall surface 2 is obtained.
As shown in fig. 2, the thickening of the blade is achieved by changing the original suction surface molded line 12 of the blade, beta is the radian of the original suction surface molded line, the included angle alpha is the radian of the original suction surface inlet part molded line 7, the inlet edge 6 of the blade is increased in the circumferential direction by the thickness b, the value range of b is (0.5-0.8), the thickness b is gradually reduced along the original suction surface inlet part molded line 7 towards the outer edge 11 of the blade, a new inlet part suction surface molded line 8 is formed, and the value of the included angle alpha is (0.15-0.25); the included angle theta is the radian of the outlet part line of the original suction surface, wherein the thickness d of the outlet part line 9 of the original suction surface is increased along the circumferential direction at the outer edge 11 of the blade, the value range of d is (0.8-1) t, the angle is gradually reduced along the outlet part line 9 of the original suction surface towards the inlet edge 6 of the blade, a new outlet part line 10 of the suction surface is formed, and the value range of the included angle theta is (0.2-0.25) beta.
The above description is only illustrative of the preferred embodiments of the invention and is not intended to limit the scope of the invention in any way. Any alterations or modifications of the invention, which are obvious to those skilled in the art based on the teachings disclosed above, are intended to be equally effective embodiments, and are intended to be within the scope of the appended claims.
Claims (1)
1. The design realization method of the durable mud pump for prolonging the service life is characterized by comprising the following steps of: on the basis of the original design of the mud pump, the area with concentrated stress and serious abrasion of the mud pump is thickened unevenly and locally;
the non-uniform local thickening of the volute is designed to be:
dividing the volute into a plurality of shaft sections, and adopting a non-uniform thickening design for the wall thickness of each shaft section according to the serious condition of abrasion in the volute; the abrasion of the partition tongue is the most serious, the abrasion of the bottom and two side areas of the volute is more serious, and the abrasion of the outlet part of the volute and the top of the volute is less, so that the wall thickness of the partition tongue is (1.4-1.5) t, the wall thickness of the bottom and two side areas of the volute is (1.1-1.3) t, and the thickness of the outlet part of the volute and the top area adopts the basic thickness t of the volute casing; when the conveyed sediment is coarse sand or cannot run in the high-efficiency area for a long time, the thickness of each area takes a larger value in each range;
on a plane view of the hydraulic design of the volute, the positions of all the shaft sections, the volute outlets and the partition tongues after the thickness is increased are dotted on the plane view of the volute, and the obtained points are smoothly connected, so that the outer wall surface of the volute is obtained;
the non-uniform local thickening of the impeller is designed as:
the thickening of the blade is completed by changing the original suction surface molded line of the blade, beta is the radian of the original suction surface molded line, the included angle alpha is the radian of the part molded line of the original suction surface inlet, the circumferential direction of the edge of the inlet of the blade is increased by the thickness b, the value range of b is (0.5-0.8) t, the thickness is gradually reduced along the part molded line of the original suction surface inlet to the outer edge of the blade, the molded line of the suction surface of the new inlet part is formed, and the value of the included angle alpha is (0.15-0.25) beta; the included angle theta is the radian of the outlet part line of the original suction surface, wherein the thickness d of the outlet part line of the original suction surface is increased along the circumferential direction at the outer edge of the blade, the value range of d is (0.8-1) t, the angle theta gradually decreases along the outlet part line of the original suction surface towards the inlet edge of the blade to form a new outlet part line of the suction surface, and the value range of the included angle theta is (0.2-0.25) beta.
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| CN201810161105.3A CN108331763B (en) | 2018-02-27 | 2018-02-27 | Design realization method of durable mud pump with prolonged service life |
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| CN201810161105.3A CN108331763B (en) | 2018-02-27 | 2018-02-27 | Design realization method of durable mud pump with prolonged service life |
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| CN108331763B true CN108331763B (en) | 2024-04-05 |
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| CN110107538B (en) * | 2019-05-27 | 2021-03-02 | 兰州理工大学 | Water pumping chamber of centrifugal pump |
| CN110143408B (en) * | 2019-06-20 | 2024-05-31 | 江苏徐工工程机械研究院有限公司 | Throwing device and material throwing machine |
| DE102019005469A1 (en) * | 2019-08-05 | 2021-02-11 | KSB SE & Co. KGaA | Closed centrifugal pump channel impeller for liquids with abrasive or erosive additions |
| CN112709717A (en) * | 2019-10-25 | 2021-04-27 | 广州市拓道新材料科技有限公司 | Wear-resistant pump body and manufacturing method thereof |
| CN114688089A (en) * | 2020-12-31 | 2022-07-01 | 宁波方太厨具有限公司 | Water pump volute for cleaning machine |
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