Novel 90-degree variable-curvature bent pipe

A new type of technology with variable curvature, applied in the field of pipe bends, can solve the problems of increasing resistance loss and achieve the effects of reducing resistance loss, improving flow characteristics, and good flow conditions

Inactive Publication Date: 2012-04-11
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing 90° elbow is mainly an elbow with equal curvature radius, that is, the central arc of the elbow is a quarter arc, and there is a strong Dean vortex in the existing 90° elb

Method used

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  • Novel 90-degree variable-curvature bent pipe
  • Novel 90-degree variable-curvature bent pipe
  • Novel 90-degree variable-curvature bent pipe

Examples

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Example Embodiment

[0037] The central arc of the new 90° variable-curvature elbow is a variable-curvature arc with a gradually increasing curvature or a quarter elliptical line. Each section perpendicular to the central arc 4 is of equal diameter D Circular section. D Is the diameter of the inlet 5 and outlet 6 of the elbow. Ribs 1 are symmetrically arranged on both sides of the inner wall of the elbow, the thickness of the ribs is 0.005 D , The height is 0.05 D , The profile line of the rib and the center line of the elbow are in the same curved surface, and the distance between the two ends of the rib and the inlet and outlet of the elbow is 0.33~0.36 respectively D .

[0038] New type of 90° variable curvature elbow, according to the pipe diameter of the straight pipe, a new type of variable curvature elbow with equal pipe diameter is selected. One side of the inlet with small curvature (short axis 3) is connected to the water inlet straight pipe 7, and the other side (long axis 2) ) Connect the...

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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 [0001] The invention relates to an elbow for pipe turning and connection, in particular to the structure of the elbow which can improve the flow characteristics in the elbow, reduce the resistance loss of the elbow, and improve the flow state at the outlet of the elbow, and belongs to the technical field of fluid engineering. Background technique [0002] Elbows are widely used in industrial, agricultural, municipal and other equipment, such as hydraulic machinery, fluid machinery, oil and gas transportation, and pipeline systems for water supply and drainage. The usual curved pipes are arc curved pipes with equal curvature, and the secondary flow intensity inside them is relatively high, resulting in increased resistance loss. Secondary flow refers to a kind of regular accompanying motion produced when viscous fluid moves in a curve under a certain mainstream velocity and certain geometric boundary conditions. The fluid flows through the corner of the pipe ...

Claims

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Application Information

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IPC IPC(8): F16L43/00F15D1/04
Inventor 刘超杨帆
Owner YANGZHOU UNIV
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