CN102410421A - Novel 90-degree variable-curvature bent pipe - Google Patents
Novel 90-degree variable-curvature bent pipe Download PDFInfo
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- CN102410421A CN102410421A CN2011102850492A CN201110285049A CN102410421A CN 102410421 A CN102410421 A CN 102410421A CN 2011102850492 A CN2011102850492 A CN 2011102850492A CN 201110285049 A CN201110285049 A CN 201110285049A CN 102410421 A CN102410421 A CN 102410421A
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Abstract
The invention provides a novel 90-degree variable-curvature bent pipe, belonging to the technical field of fluid engineering. The central arc line of the bent pipe is a variable-curvature arc line with a gradually increased curvature or a quarter elliptic type line, each cross section perpendicular to the central arc line is a circular cross section, the circular cross section is a circular surface the diameter (D) of which is equal to that of an inlet orifice and an outlet orifice of the bent pipe, two side of the inner wall of the bent pipe are symmetrically provided with ribs, the thickness of the ribs is 0.005D, the height is 0.05D, the molded lines of the ribs and the central line of the bent pipe are arranged in the same curved surface, and the distance from the two ends of the ribs to the inlet and outlet orifices are respectively the length of the diameter (D) of 0.33-0.36 orifices. The novel 90-degree variable-curvature bent pipe provided by the invention has a scientific and simple structure and reasonable design, can restrain dean vortex, reduce the resistance loss by 4-8% caused by the dean vortex and improve the hydraulic efficiency of the whole pipeline or mechanical equipment system.
Description
Technical field
The present invention relates to the bend pipe that a kind of pipeline turning connects usefulness, especially can improve the flow characteristic in the bend pipe, reduce the drag losses of bend pipe, improve the structure of the bend pipe of winding pipe exit fluidised form, belong to the fluid engineering technical field.
Background technique
Bend pipe is present on the equipment such as industry, agricultural, municipal administration widely, transports pipe-line system with plumbing etc. like hydraulic machinery, fluid machinery, oil gas.Common bend pipe is the circular arc bend pipe of iso-curvature, and its inner secondary flow intensity is bigger, causes drag losses to increase.Secondary flow is meant under certain mainstream speed, certain geometric boundary condition, a kind of associated movement clocklike that is produced when viscous fluid is done curvilinear motion.Fluid is with certain flow velocity pipeline corner of flowing through; The restriction that receives pipe bending will change flow direction; Near the wall of bend pipe, form the separation zone; Produce secondary flow on the cross-section of pipeline, such secondary flow not only can cause the loss of fluid energy, and the part that forms hinders the resistance increase that the zone also makes running system.Secondary flow in the bend pipe mainly is meant the Dien whirlpool, when promptly incompressible fluid flows in bend pipe, because of action of centrifugal force forms a pair of inversion symmetry vortex.
Existing 90 ° of bend pipes are mainly the bend pipe of iso-curvature radius; The center camber line that is bend pipe is the quadrant arc; All there is stronger Dien whirlpool, in existing 90 ° of bend pipes, increases guide plate and only can improve the outlet cross-section pressure and the velocity flow profile of bend pipe, but can increase its drag losses.Common issue with to present these bend pipes existence; Design a kind of novel 90 ° of its meanings of overcurrent bend pipe and application value and just seem very big; Can not only improve the flow characteristic in the bend pipe, and can reduce the drag losses of bend pipe, improve the velocity flow profile of winding pipe exit.
Summary of the invention
The object of the invention is exactly the deficiency that exists to above-mentioned existing technology, and a kind of novel 90 ° of variable curvature overcurrent bend pipes are provided, and can improve the flow characteristic in the bend pipe, reduces the drag losses of bend pipe, improves the winding pipe exit fluidised form, provides based on caliber
DThe parametrization control size, and processing and fabricating is simple, conveniently produces in batches, is convenient to applying of actual engineering.
The present invention is based on least resistance principle and Dien and count equation bend pipe is designed, to reach:
(1) drag losses of overcurrent bend pipe is minimum;
(2) improve the inner flow characteristic of bend pipe.
Fluid least resistance principle and application
The fluid least resistance principle refers to that fluid always flows along the path flow of resistance minimum or with the minimum mode of resistance under the situation of certain discharge value.In fact, this is the rule that nature is generally followed.
Current flow in bend pipe and receive the effect of centrifugal inertia force and trend towards the outside of bend pipe, have simultaneously to break away from the inboard trend of bend pipe.Therefore, the drag losses one in the bend pipe is the frictional loss between current and the tube wall, the 2nd, and current break away from the whirlpool loss that the limit wall causes.
h f ?=
ζ f
h j ?=
ζ j (
v 2/2g)
In the formula:
h f ---frictional loss (linear loss);
h j ---local losses;
ζ f ---friction loss coefficient;
ζ j ---the local losses coefficient;
v
---flow rate of water flow in the pipeline.
Dien is counted equation
Generation based on the Dien vortex pair is owing to suffered centrifugal force of bend pipe inner fluid and viscous force results of interaction, and counts equation based on Dien and calculate, and the Dien number is the interior centrifugal force that flows of bend pipe and the ratio of viscous force, that is:
Dn=
Re×（
D/2
r c）
0.5
In the formula:
Re
---reynolds' number;
D
---pipe diameter, m;
r c
---the radius of curvature of expression bend pipe, m;
n---90 ° of bend pipe radius of curvature of tradition and admission section diameter
DThe ratio.
Technological scheme of the present invention is: novel 90 ° of variable curvature bend pipes, it is characterized in that the center camber line of said bend pipe is for progressively increasing the variable curvature camber line of curvature or 1/4th oval molded lines, and be circular cross section perpendicular to each section of center camber line.
Said circular cross section be with bend pipe into and out of the isodiametric rounded face of the mouth of pipe.
The inwall bilateral symmetry of said bend pipe is arranged rib, and the thickness of rib is 0.005
D, highly be 0.05
D, the molded lines of rib and bend pipe center line are in same curved surface, and the rib two ends are respectively 0.33～0.36 nozzle diameter length apart from bend pipe into and out of the mouth of pipe.
DBe the import of bend pipe, the diameter of outlet.
Scientific structure of the present invention is simple, and is reasonable in design, and the formation in Dien whirlpool is set about in the bend pipe; Suppress flowing of the interior Dien whirlpool of bend loss; Force the position of vortex core to change, flow velocity and the pressure distribution of adjustment in the bend pipe reduces the Yin Dien whirlpool and the drag losses that causes; For winding pipe exit provides the condition of effluenting better, accelerate to eliminate Dien whirlpool phenomenon fully in the straight length.To the drag losses that reduces bend pipe with improve the significant and using value of internal flow state.The present invention is applicable to various pipe-line systems and has in the machinery of 90 ° of bend pipes, reduces drag losses, improves internal flow state, improves the hydraulic efficiency of whole pipeline or mechanical equipment system.
The drag losses of the novel 90 ° of variable curvature bend pipes of the present invention is little; Calculate according to Three-dimensional Flow; It is about 4% that the bend pipe of comparing 90 ° of iso-curvature radiuses of tradition of equal center arc length can reduce drag losses, and it is about 8% that the bend pipe of ribbed can reduce drag losses, and the hydraulic performance of bend pipe is good; Energy-conserving action is very remarkable, and application and popularization value is huge.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a generalized section of the present invention.
Fig. 3 is the A-A generalized section among Fig. 2.
Fig. 4 is a user mode schematic representation of the present invention.
Among the figure: 1 rib; 2 major axis; 3 minor axises; 4 center camber lines; 5 imports; 6 outlets; 7 water inlet straight tubes; 8 water outlet straight tubes.
Embodiment
The center camber line of novel 90 ° of variable curvature bend pipes is for progressively increasing the variable curvature camber line of curvature or 1/4th oval molded lines, is equal diameter perpendicular to each section of center camber line 4
DCircular cross section.
DBe the import 5 of bend pipe, the diameter of outlet 6.The inwall bilateral symmetry of bend pipe is provided with rib 1, and the thickness of rib is 0.005
D, highly be 0.05
D, the molded lines of rib and bend pipe center line are in same curved surface, and the rib two ends are respectively 0.33～0.36 apart from bend pipe into and out of the mouth of pipe
D
Novel 90 ° of variable curvature bend pipes; Novel variable curvature bend pipe according to the calibers such as caliber selection of straight tube; One side-entrance of curvature little (minor axis 3) connects into water straight tube 7; Opposite side (major axis 2) picks out water straight tube 8, and bend pipe guarantees to dock bad installation phenomenons such as the no convexity in back into and out of the center-aligned of mouth of pipe section center and both sides straight tube.
The present invention is applicable in the pipe-line system and machinery (like pump, water turbine) in the fields such as industry, agricultural, municipal administration, should guarantee to carry out machine-building according to designing requirement, and the especially processing of rib guarantees the smooth of rib surface.
90 ° of variable curvature bend pipes of the present invention both can adopt metal material, also can adopt materials such as plastics, glass fibre reinforced plastics, satisfied the needs of different practical situations.
Claims (3)
1. novel 90 ° of variable curvature bend pipes is characterized in that, the center camber line of said bend pipe is for progressively increasing the variable curvature camber line of curvature or 1/4th oval molded lines, are circular cross section perpendicular to each section of center camber line.
2. novel 90 ° of variable curvature bend pipes according to claim 1 is characterized in that, said circular cross section be with bend pipe into and out of the isodiametric rounded face of the mouth of pipe.
3. novel 90 ° of variable curvature bend pipes according to claim 1 is characterized in that, the inwall bilateral symmetry of said bend pipe is arranged rib, and the thickness of rib is 0.005
D, highly be 0.05
D, the molded lines of rib and bend pipe center line are in same curved surface, and the rib two ends are respectively 0.33～0.36 nozzle diameter length apart from bend pipe into and out of the mouth of pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102850492A CN102410421A (en) | 2011-09-23 | 2011-09-23 | Novel 90-degree variable-curvature bent pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102850492A CN102410421A (en) | 2011-09-23 | 2011-09-23 | Novel 90-degree variable-curvature bent pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102410421A true CN102410421A (en) | 2012-04-11 |
Family
ID=45912654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102850492A Pending CN102410421A (en) | 2011-09-23 | 2011-09-23 | Novel 90-degree variable-curvature bent pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523830A (en) * | 2016-10-24 | 2017-03-22 | 扬州市勘测设计研究院有限公司 | Right-angled elbow provided with flow guiding rib plates |
| CN106762706A (en) * | 2017-03-08 | 2017-05-31 | 佛山市肯富来工业泵有限公司 | Anti-clogging submersible sewage pump |
| CN106838521A (en) * | 2017-04-10 | 2017-06-13 | 中冶东方控股有限公司 | A kind of elbow with deflector |
| CN110849200A (en) * | 2019-11-29 | 2020-02-28 | 四川大学 | Supercritical C02Flow guiding structure of pipeline type heat exchanger |
| CN112231869A (en) * | 2020-09-21 | 2021-01-15 | 江苏大学镇江流体工程装备技术研究院 | Method and device for measuring dean vortex motion information |
| CN114595523A (en) * | 2021-09-08 | 2022-06-07 | 江苏大学镇江流体工程装备技术研究院 | Elbow-shaped water outlet channel hydraulic design method based on dean vortex theory |
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| CN2075293U (en) * | 1990-10-24 | 1991-04-17 | 王焕忠 | Beng avoiding connector |
| EP0771991A1 (en) * | 1995-11-02 | 1997-05-07 | Udo Dr.-Ing. Küppers | Elbow connection element and method of manufacture |
| CN101368657A (en) * | 2008-09-27 | 2009-02-18 | 同济大学 | Rib abrasion-resistant elbow used for concrete pumping system |
| CN102109077A (en) * | 2011-01-25 | 2011-06-29 | 长沙中联重工科技发展股份有限公司 | Reducing bent pipe and pumping equipment with same |
-
2011
- 2011-09-23 CN CN2011102850492A patent/CN102410421A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2075293U (en) * | 1990-10-24 | 1991-04-17 | 王焕忠 | Beng avoiding connector |
| EP0771991A1 (en) * | 1995-11-02 | 1997-05-07 | Udo Dr.-Ing. Küppers | Elbow connection element and method of manufacture |
| CN101368657A (en) * | 2008-09-27 | 2009-02-18 | 同济大学 | Rib abrasion-resistant elbow used for concrete pumping system |
| CN102109077A (en) * | 2011-01-25 | 2011-06-29 | 长沙中联重工科技发展股份有限公司 | Reducing bent pipe and pumping equipment with same |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523830A (en) * | 2016-10-24 | 2017-03-22 | 扬州市勘测设计研究院有限公司 | Right-angled elbow provided with flow guiding rib plates |
| CN106523830B (en) * | 2016-10-24 | 2019-09-06 | 扬州市勘测设计研究院有限公司 | A kind of 90 ° of bend pipes of band water conservancy diversion gusset |
| CN106762706A (en) * | 2017-03-08 | 2017-05-31 | 佛山市肯富来工业泵有限公司 | Anti-clogging submersible sewage pump |
| CN106762706B (en) * | 2017-03-08 | 2023-02-14 | 佛山市肯富来工业泵有限公司 | Anti-blocking submersible sewage pump |
| CN106838521A (en) * | 2017-04-10 | 2017-06-13 | 中冶东方控股有限公司 | A kind of elbow with deflector |
| CN106838521B (en) * | 2017-04-10 | 2019-07-30 | 中冶西北工程技术有限公司 | A kind of elbow with deflector |
| CN110849200A (en) * | 2019-11-29 | 2020-02-28 | 四川大学 | Supercritical C02Flow guiding structure of pipeline type heat exchanger |
| CN110849200B (en) * | 2019-11-29 | 2022-03-15 | 四川大学 | Supercritical C02Flow guiding structure of pipeline type heat exchanger |
| CN112231869A (en) * | 2020-09-21 | 2021-01-15 | 江苏大学镇江流体工程装备技术研究院 | Method and device for measuring dean vortex motion information |
| CN112231869B (en) * | 2020-09-21 | 2023-06-16 | 江苏大学镇江流体工程装备技术研究院 | Dien vortex movement information measuring method and device |
| CN114595523A (en) * | 2021-09-08 | 2022-06-07 | 江苏大学镇江流体工程装备技术研究院 | Elbow-shaped water outlet channel hydraulic design method based on dean vortex theory |
| CN114595523B (en) * | 2021-09-08 | 2023-10-10 | 江苏大学镇江流体工程装备技术研究院 | Elbow-shaped water outlet flow passage hydraulic design method based on Dien vortex theory |
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Application publication date: 20120411 |