CN109185227A - A kind of solid-liquid two-phase flow centrifugal pump cut water design method - Google Patents
A kind of solid-liquid two-phase flow centrifugal pump cut water design method Download PDFInfo
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- CN109185227A CN109185227A CN201810897656.6A CN201810897656A CN109185227A CN 109185227 A CN109185227 A CN 109185227A CN 201810897656 A CN201810897656 A CN 201810897656A CN 109185227 A CN109185227 A CN 109185227A
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- elastic
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- tongue
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- 239000007788 liquid Substances 0.000 title claims abstract description 37
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 20
- 230000005489 elastic deformation Effects 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims description 41
- 239000000463 material Substances 0.000 claims description 16
- 239000013013 elastic material Substances 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims 1
- 239000007787 solid Substances 0.000 abstract description 8
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract description 2
- 210000002105 tongue Anatomy 0.000 description 41
- 238000010586 diagram Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000002955 isolation Methods 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
- 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
- F04D29/428—Discharge tongues
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to field of fluid machinery, are related to a kind of solid-liquid two-phase flow centrifugal pump cut water design method.The novel elastic cut water structure is made of elastic portion and rigid portion；Elastic portion is made of work department and fixed part；By the extruding of solid particle elastic deformation occurs for work department, to increase the gap of cut water and impeller, may finally make normal operation and energy characteristics of the large-sized solid particle safety without influencing pump.Fixed part is by being fixed elastic portion with rigid portion interference fit.The configuration of the present invention is simple, operation are easy, can effectively increase can be by the diameter of particle at cut water, and the energy characteristics for not influencing pump can guarantee to carry out continual and steady solid-liquid two-phase flow conveying without blocking in pump for pump and provide great guarantee when conveying solid-liquid two-phase flow.
Description
Technical Field
The invention belongs to the field of fluid machinery, and particularly relates to a design method of a solid-liquid two-phase flow centrifugal pump partition tongue.
Background
In order to ensure that the hydraulic performance of the centrifugal pump meets the requirement during design, gaps between the partition tongues and the impeller are designed to be as small as possible. Therefore, when the centrifugal pump is used for conveying solid-liquid two-phase flow, the clearance between the partition tongue and the impeller is extremely small, so that the clearance between the impeller and the partition tongue is blocked or the impeller is damaged. In order to prevent the pump from being blocked or the impeller from being damaged, the clearance between the partition tongue and the impeller needs to be increased, which can cause the hydraulic performance of the pump to be obviously reduced. Therefore, the invention needs to invent a partition tongue structure design of a solid-liquid two-phase flow centrifugal pump, so that the hydraulic performance of the pump can be ensured, and solid particles can not be blocked or damaged when passing through a gap between an impeller and the partition tongue.
Therefore, the solid-liquid two-phase flow centrifugal pump partition tongue capable of widening the gap is designed, the partition tongue is divided into an elastic part and a rigid part, the elastic part is divided into a working part and a fixing part, the elastic part is made of elastic materials, and the rigid part is made of rigid materials; the elastic part is fixed in the groove of the rigid part through interference fit of the fixing part and the rigid part; when the particle size of the particles conveyed by the pump is larger than the gap between the impeller and the partition tongue, the working part of the elastic part is elastically deformed to enlarge the gap between the partition tongue and the impeller, so that the particles can safely pass through the gap without damaging the blades or blocking the gap.
So far, no patent publication exists for a design method of a solid-liquid two-phase flow centrifugal pump partition tongue, and the invention provides a design method of a solid-liquid two-phase flow centrifugal pump partition tongue.
Disclosure of Invention
The invention provides a design method of a solid-liquid two-phase flow centrifugal pump partition tongue.
The invention is realized by the following technical scheme: a design method for a solid-liquid two-phase flow centrifugal pump partition tongue comprises an elastic material, a rigid material, an elastic convex groove and a rigid concave groove; the elastic material and the rigid material are fixed through corresponding concave-convex groove clamping and interference fit; in order to prolong the service life of the elastic material, the corners of the grooves and the convex grooves are rounded; the closed space formed between the elastic groove and the rigid convex groove effectively prevents leakage.
The specific working process of the invention is as follows: when the centrifugal pump is used for conveying solid-liquid two-phase flow, when larger particles pass through the gap between the impeller and the partition tongue, the elastic partition tongue is extruded to increase the gap, so that the particles can safely pass through the gap and the pump blockage and blade damage are avoided. After the particles pass through the elastic isolating tongue, the elastic isolating tongue returns to the original shape, and the hydraulic performance of the pump is guaranteed to be kept stable.
In the above-described embodiment, the design length L of the working portion is determined according to the amount w of deformation required for the working portion.
In the scheme, the design parameters of the working part are determined by the design parameters of the volute of the centrifugal pump according to the design length L of the working part.
In the scheme, the design parameters of the elastic groove and the rigid convex groove are determined according to the design length L of the working part.
Has the advantages that: the invention has simple structure and easy operation, can increase the clearance between the partition tongue and the impeller by elastic deformation of the elastic material, and can ensure that the centrifugal pump can still maintain the normal operation and no blockage of the impeller when conveying larger solid particles; the invention provides guarantee for the centrifugal pump to safely convey the solid-liquid two-phase flow.
Drawings
FIG. 1 is an axial sectional view of a solid-liquid two-phase flow centrifugal pump partition tongue
FIG. 2 is a sectional view of a solid-liquid two-phase flow centrifugal pump partition tongue
FIG. 3 is a rigid groove diagram of a solid-liquid two-phase flow centrifugal pump partition tongue
FIG. 4 is a diagram of elastic convex block of a solid-liquid two-phase flow centrifugal pump partition tongue
FIG. 5 is a schematic diagram of the deformation of the diaphragm of the centrifugal pump with solid-liquid two-phase flow
In the figure: 1 rigid part 2 elastic part 3 rigid groove 4 cross-shaped rigid tongue 5 elastic lug 6 cross-shaped elastic groove
Detailed Description
Example (b):
a partition tongue structure of a solid-liquid two-phase flow centrifugal pump comprises a rigid part and an elastic part, wherein the rigid part is made of rigid materials, and the elastic part is made of elastic materials. The elastic part is divided into a working part and a fixing part. The design parameter of the centrifugal pump is that the flow Q is 40m3H, lift H8.0 m, speed n 2800r/min, blade number Z5, blade outlet angle β230 DEG, blade outlet axial plane velocity Vm26.28m/s, blade exit peripheral speed u220.5m/s, impeller external diameter D2140mm, 18mm impeller outlet width b, and blade inlet thickness δ33mm, impeller exit flow angleα3-13 deg. and base circle diameter D of the tongue3142mm, upper width b of the tongue partition section127mm, lower width b of the tongue cross-section225mm, 4.5mm of the height h of the cross section of the isolating tongue, 6mm of the arc radius R of two sides of the cross section of the isolating tongue and 1.0Q of the flow rate of the experimental designdThe particle size d of the test pumping particles is 16 mm. The invention is further described below with reference to the accompanying drawings:
1. two material requirements of the design of the solid-liquid two-phase flow centrifugal pump partition tongue are as follows:
(1) the rigid material is cast iron, namely the pump body casting material.
(2) The elastic material is rubber.
Ultimate stress of rubber is sigmaRubber composition＝75Mpa
The theoretical lift of the solid-liquid two-phase flow centrifugal pump is
Wherein,
then
Wherein the theoretical lift is HtThe blade exit peripheral speed is u220.5m/s, slip coefficient σ, blade exit axial plane velocity Vm26.28m/s, blade exit angle β230 degrees and the number of the blades is Z-5.
Thus, the pump internal stress is σPump and method of operating the same＝ρ×g×Ht＝1000×9.8×6.67＝65366Pa≈0.07Mpa，
To ensure the normal operation of the centrifugal pump, the maximum stress in the pump is taken as [ sigma ]]Pump and method of operating the same＝1.2×σPump and method of operating the same＝1.2×0.07＝0.084Mpa，
At this time, σRubber composition＞＞[σ]Pump and method of operating the same，
Therefore, the elastic material is rubber, which can meet the design requirement of the solid-liquid two-phase flow centrifugal pump.
2. And determining the maximum elastic deformation w of the working part according to the pumping maximum particle size d.
(1) Theoretical maximum deformation w of said elastic material 21And determining according to the pumping maximum particle size d to satisfy the formula.
w1＝D2/2+d-D3/2
According to the design parameters of the centrifugal pump, D is taken2＝140mm，D3142mm, 16mm, and w1＝15mm。
(2) The maximum elastic deformation w of the working part needs to satisfy that w is more than or equal to 1.2w1Therefore, w is more than or equal to 18 mm. Take w as 18 mm.
3. The shape design of the working part is determined according to the design length L of the working part.
(1) And determining the design length L of the working part according to the maximum deformation w required by the working part.
L3Aτ＝3wEI
Wherein the cross-sectional area of the tongue is A, the shear stress is tau, the elastic modulus E is 7.84MPa, the shear modulus G is 1.95MPa, the inertia moment is I, α is the central angle of the cross-section of the tongue, and the upper width b of the cross-section of the tongue is127mm, lower width b of the tongue cross-section2The height h of the cross section of the septum is 4.5mm, and the arc radius R of two sides of the cross section of the septum is 6 mm.
The simultaneous formula gives L15.88 mm, and the L is rounded to give L16 mm.
(2) Determining other design parameters of the working part by taking the design length L of the working part as design reference parameters, including the width b of the volute inlet3Angle for placing partition tongueAngular separation tongue α0The calculation formula is as follows:
where b is 18mm and L is 16mm, therefore, b is taken3Is 30 mm;
wherein,flow rate Q is 40m3H, the lift H is 8.0m, the rotating speed n is 2800r/min, and the design length L of the working part is 16 mm;
according to the following table, the mounting angle of the isolation tongue is taken
Wherein the width b of the volute outlet3＝30mm，Vane inlet thickness delta for displacement coefficient33mm, 5 blades and base diameter D of tongue3142mm, impeller exit flow angle α313 °, blade exit peripheral speed u220.5m/s, theoretical head Ht＝6.67m；
4. The rigid part 1 and the elastic part 2 are fixed by elastic extrusion.
(1) The rigid groove 3 of the rigid part 1 is dimensioned according to the design length L. Wherein, the length of the specific design parameter of the rigid groove 3 is a10.7L, i.e. a1D, rounding off a when the thickness is 11.2mm111mm, depth c10.6L, i.e. c19.6mm, get c as a whole1＝10mm；
Wherein the rigid groove 3 of the rigid part 1 is fourThe cross-shaped rigid convex groove 4 of the surface has specific design parameters with the length of a111mm, depth c110mm, height h20.1L, i.e. h21.6mm, and rounding to h22mm wide by b40.1L, i.e. b41.6mm, rounded, i.e. b4＝2mm。
(2) The size of the elastic projection 5 of the elastic part 2 is determined according to the design length L. Wherein the length is a30.75L, i.e. a312mm, depth c20.5L, i.e. c2＝8mm；
Wherein, the four-side cross-shaped elastic groove 6 of the elastic lug 5 of the elastic part 2 has specific design parameters with the length of a311mm, depth c28mm, height h40.08L, i.e. h41.28mm, and rounding to h41mm, width b40.08L, i.e. b41.28mm, rounded, i.e. b4＝1mm。
(3) The elastic pressure generated by the cross-shaped elastic groove 6 and the cross-shaped rigid protrusion 4 through interference fit and the elastic pressure generated by the elastic lug 5 and the rigid groove 3 through interference fit enable the elastic material 2 to be fixed in the rigid groove 3 of the rigid material 1. In order to prolong the service life of the elastic material 2, the corners of the rigid grooves 3, the cross-shaped rigid protrusions 4, the cross-shaped elastic convex grooves 6 and the elastic convex blocks 5 are rounded.
The working process of the invention is as follows:
when the centrifugal pump carries out solid-liquid two-phase flow conveying, part of solid particles do not leave the volute through the outlet pipe of the pump, but continue to rotate with the impeller in the next round, when the solid particles are just positioned at the position of a gap between the outlet of the impeller and the baffle tongue, the elastic material 2 is extruded by the solid particles to generate elastic deformation towards the water outlet end, the gap between the impeller and the baffle tongue is increased, so that the solid particles can safely pass through without causing pump blockage or blade damage, and the schematic diagram of the deformation is shown in figure 5;
the invention can effectively ensure no blockage in the pipeline and zero damage of the impeller when the pump carries out solid-liquid two-phase flow conveying, and obviously improve the service life and the operation stability of the centrifugal pump; the invention has simple structure and easy operation, and provides a feasible design method of the solid-liquid two-phase flow centrifugal pump partition tongue for stable solid-liquid two-phase flow delivery of the pump.
Claims (5)
1. A design method for a solid-liquid two-phase flow centrifugal pump partition tongue is characterized by comprising the following specific steps:
(1) the solid-liquid two-phase flow centrifugal pump partition tongue structure comprises a rigid part 1 and an elastic part 2, wherein the rigid part 1 is made of a rigid material, and the elastic part 2 is made of an elastic material; the elastic part is a working part and a fixing part;
(2) the maximum deformation w of the working part is determined according to the maximum particle size d conveyed by the solid-liquid two-phase flow centrifugal pump;
(3) the shape design of the working part is determined according to the design length L of the working part;
(4) according to the material characteristics of the tongue-shaped rigid part 1 and the elastic part 2 of the solid-liquid two-phase flow centrifugal pump, a suitable connection mode is designed.
2. The design method of the partition tongue of the solid-liquid two-phase flow centrifugal pump according to claim 1, characterized in that: the material selection requirements of the rigid part 1 and the elastic part 2;
(1) the rigid material is the material adopted by the rigid part 1 and is the casting material of the pump body;
(2) the elastic material is the material adopted by the elastic part 2; the ultimate bearing stress of the elastic material is larger than the theoretical lift Ht，
Theoretical lift HtDetermining according to the formula:
wherein the theoretical lift is HtThe blade exit peripheral speed is u2The coefficient of slip is sigma, and the blade outlet axial plane velocity is Vm2Blade exit angle of β2The number of the leaves is Z;
(3) the elastic part 2 is divided into a working part and a fixing part, the fixing part and the rigid part are fixed through clamping, and the working part increases the clearance between the impeller and the partition tongue through elastic deformation to ensure the normal work of the solid-liquid two-phase flow centrifugal pump.
3. The design method of the partition tongue of the solid-liquid two-phase flow centrifugal pump according to claim 1, characterized in that: the working part maximum deformation w is obtained by the following steps:
(1) calculating the theoretical maximum deformation w of the working part according to a formula1；
w1＝D2/2+d-D3/2(d＞D3/2-D2/2)
Wherein the theoretical maximum elastic deformation amount is w1The outer diameter of the impeller is D2The base circle diameter of the isolating tongue is D3；
(2) In order to reserve enough elastic deformation safety margin for the working part, the maximum deformation w is not less than the theoretical maximum elastic deformation w11.2 times of that of the total weight of the powder, namely w is more than or equal to 1.2w1。
4. The design method of the partition tongue of the solid-liquid two-phase flow centrifugal pump according to claim 1, characterized in that: the shape design of the working part is determined by the design length L of the working part, and the method comprises the following specific steps:
(1) determining the design length L of the working part according to the deformation w required by the working part, wherein the specific calculation formula is as follows:
L3Aτ＝3wEI
wherein the cross-sectional area of the partition tongue is A, the shear stress is tau, the elastic modulus is E, the shear modulus is G, the inertia moment is I, α is the central angle of the cross-section of the partition tongue, b1Upper width of the cross section of the tongue, b2The lower width of the cross section of the partition tongue, h is the height of the cross section of the partition tongue, and R is the radius of circular arcs on two sides of the cross section of the partition tongue;
(2) determining other design parameters of the working part by taking the design length L of the working part as design reference parameters, including the width b of the volute inlet3Angle for placing partition tongueAngular separation tongue α0The value taking method comprises the following steps:
according to nsThe value of + lgL determines the shelf angleThe value range of (1);
when n is more than or equal to 35sWhen the + lgL is less than or equal to 62,
when 62 is less than or equal to nsWhen the + lgL is less than or equal to 143,
when 143 is less than or equal to nsWhen the + lgL is less than or equal to 214,
when 213 is less than or equal to nsWhen the + lgL is less than or equal to 372,
wherein b is the width of the outlet of the impeller,to the coefficient of displacement, delta3Thickness of the inlet of the blade, α3Is the impeller exit flow angle.
5. The design method of the partition tongue of the solid-liquid two-phase flow centrifugal pump according to claim 1, characterized in that: the connection mode of the rigid part 1 and the elastic part 2 is determined according to the material characteristics and the design length L of the working part, and the specific steps are as follows:
(1) the rigid part 1 is cut on the surface thereof and has a length a10.7L square with depth c10.6L rigid groove 3; the length a is added on four sides of the rigid groove 31Depth of c1Width of b40.1L, height h2A 0.1L cross-shaped rigid protrusion 4;
(2) the elastic part 2, corresponding to the part of the rigid groove 3, is provided with an elastic lug 5 with the length a30.75L square with depth c20.5L; the elastic bump 5 has a length a on four sides3Depth of c2Height h40.08L, width b4A 0.08L cross-shaped elastic groove 6; the elastic lug 5 is a fixed part of the elastic part 2;
(3) the rigid groove 3 and the cross-shaped rigid protrusion 4 are both arranged on the rigid part 1; the cross-shaped elastic convex groove 6 is positioned at the fixed part of the elastic part 2; the elastic pressure generated by the cross-shaped elastic groove 6 and the cross-shaped rigid protrusion 4 through interference fit and the elastic pressure generated by the elastic lug 5 and the rigid groove 3 through interference fit enable the elastic part 2 to be fixed in the rigid groove 3 of the rigid part 1; in order to prolong the service life of the elastic part 2, the corners of the rigid concave groove 3, the cross-shaped rigid protrusion 4, the cross-shaped elastic convex groove 6 and the elastic convex block 5 are rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810897656.6A CN109185227B (en) | 2018-08-08 | 2018-08-08 | Design method for partition tongue of solid-liquid two-phase flow centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810897656.6A CN109185227B (en) | 2018-08-08 | 2018-08-08 | Design method for partition tongue of solid-liquid two-phase flow centrifugal pump |
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| CN109185227A true CN109185227A (en) | 2019-01-11 |
| CN109185227B CN109185227B (en) | 2021-01-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021077886A1 (en) * | 2019-10-25 | 2021-04-29 | 广州市拓道新材料科技有限公司 | Wear-resistant pump body and fabrication method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5598699A (en) * | 1979-01-23 | 1980-07-26 | Matsushita Electric Ind Co Ltd | Cross-flow fan |
| CN2316496Y (en) * | 1997-08-31 | 1999-04-28 | 赵廷舫 | Changeable isolation tongue type pump body core |
| US20040022641A1 (en) * | 2002-07-31 | 2004-02-05 | Masaki Ikeya | Friction regenerative pump |
| CN103062123A (en) * | 2012-11-07 | 2013-04-24 | 江苏大学 | Centrifugal pump volute structure capable of reducing noises and racial forces |
| CN204511988U (en) * | 2015-02-12 | 2015-07-29 | 宁波方太厨具有限公司 | A kind of centrifugal blower of snail tongue dynamic adjustment |
-
2018
- 2018-08-08 CN CN201810897656.6A patent/CN109185227B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5598699A (en) * | 1979-01-23 | 1980-07-26 | Matsushita Electric Ind Co Ltd | Cross-flow fan |
| CN2316496Y (en) * | 1997-08-31 | 1999-04-28 | 赵廷舫 | Changeable isolation tongue type pump body core |
| US20040022641A1 (en) * | 2002-07-31 | 2004-02-05 | Masaki Ikeya | Friction regenerative pump |
| CN103062123A (en) * | 2012-11-07 | 2013-04-24 | 江苏大学 | Centrifugal pump volute structure capable of reducing noises and racial forces |
| CN204511988U (en) * | 2015-02-12 | 2015-07-29 | 宁波方太厨具有限公司 | A kind of centrifugal blower of snail tongue dynamic adjustment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021077886A1 (en) * | 2019-10-25 | 2021-04-29 | 广州市拓道新材料科技有限公司 | Wear-resistant pump body and fabrication method therefor |
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| CN109185227B (en) | 2021-01-05 |
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