CN-117869794-B - Multistage combined rectifier and fluid pipeline conveying system

CN117869794BCN 117869794 BCN117869794 BCN 117869794BCN-117869794-B

Abstract

The invention discloses a multistage composite rectifier and a fluid pipeline conveying system, wherein the multistage composite rectifier comprises a first-stage rectifying section, a second-stage rectifying section, a third-stage rectifying section and a first buffer section, the second buffer section is arranged, the first-stage rectifying section comprises first-stage guide vanes which are uniformly distributed on a pipe wall, the second-stage rectifying section comprises second-stage guide vanes which are distributed in a pipeline in a crossing way, and the third-stage rectifying section comprises rectifying holes and rectifying flow channels which divide the third-stage rectifying section into a plurality of sections of rectifying flow channels through the rectifying holes. The fluid pipeline conveying system comprises the multistage compound rectifier. The invention is used for improving the fluid flow characteristics, reducing turbulence and non-uniformity in the flow by adjusting the fluid flow direction and speed distribution in the pipeline, reducing the flow resistance and improving the overall energy efficiency of the system.

Inventors

LIN ZHE
Zhang Haodian
CHEN DESHENG
ZHANG GUANG
TAO JUNYU

Assignees

浙江理工大学

Dates

Publication Date: 20260505
Application Date: 20240229

Claims (9)

1. A multi-stage composite rectifier, comprising: the first-stage rectifying section comprises a first rectifying pipe and a plurality of first-stage guide vanes, the plurality of first-stage guide vanes are uniformly and annularly distributed on the inner pipe wall of the first rectifying pipe around the central axis of the flow channel, and one end of each first-stage guide vane close to the central axis of the flow channel is suspended; the second-stage rectifying section comprises a second rectifying pipe and a plurality of second-stage guide vanes, the second-stage guide vanes are uniformly and annularly distributed on the inner pipe wall of the second rectifying pipe around the central axis of the flow channel, and the second-stage guide vanes are uniformly and crosswise distributed and are connected at one position at one end close to the central axis of the flow channel; The third-stage rectifying section comprises a third rectifying tube, a rectifying flow passage and rectifying holes, wherein the third-stage rectifying section is provided with a plurality of rectifying flow passages, and the rectifying flow passages are provided with a plurality of rectifying holes; the first buffer section is communicated with the first-stage rectifying section and the second-stage rectifying section; The second buffer section is communicated with the second-stage rectifying section and the third-stage rectifying section; The first rectifying tube is a trumpet-shaped reducing tube with an inlet diameter larger than the outlet diameter, and the second rectifying tube is a trumpet-shaped diverging tube with an inlet diameter smaller than the outlet diameter.
2. The multi-stage composite rectifier of claim 1 wherein the first buffer segment has a diameter equal to the diameter of the junction between the first and second rectifier segments connected to the two ends thereof, the second buffer segment has a diameter equal to the diameter of the junction between the second and third rectifier segments connected to the two ends thereof, the first and second buffer segments are each between 0.1d and 0.4d, and d is the inlet diameter of the first rectifier segment.
3. The multi-stage composite rectifier of claim 1 wherein the first stage guide vanes have a length l 1 <0.5d, d being the first stage rectifier section inlet diameter, the number of vanes being greater than 3, and an angle of inclination θ 1 ,0＜θ 1 <90 ° from the central axis of the flow path.
4. The multi-stage composite rectifier of claim 1 wherein said rectifying apertures are circular or elliptical in shape and are annularly and centrally symmetrically distributed about the central axis.
5. A multi-stage composite rectifier according to claim 1, wherein the wall thickness of the gap between two adjacent rectifying holes is less than 1mm.
6. The multistage compound rectifier according to claim 1, wherein the direction of the flow guide channels positioned at the same horizontal position of the central axis is parallel to the central axis, and the flow guide channels positioned at the upper side and the lower side of the central axis plane are respectively bent to two sides, and the bending angle θ 2 is smaller than 90 °.
7. A fluid conduit transfer system comprising a multi-stage composite rectifier according to any one of claims 1-6.
8. The fluid conduit transfer system of claim 7, wherein the multi-stage composite rectifier is positioned behind a spoiler of the fluid conduit transfer system.
9. The fluid conduit transfer system of claim 8, wherein the turbulence member is selected from the group consisting of a bend, a valve, and a variable cross-section tube.

Description

Multistage combined rectifier and fluid pipeline conveying system Technical Field The application relates to the technical field of rectifiers, in particular to a multistage composite rectifier and a fluid pipeline conveying system. Background Turbulent flow components such as elbows, valves, variable-section pipes and the like in the fluid pipeline conveying system are extremely easy to influence the flow stability in the pipes, and the flow resistance is increased, so that the energy consumption is increased. At the same time, vibration and noise of the pipeline system can be caused, and the service life of the system is reduced. Fluid measurement is a critical element in fluid delivery systems, ensuring accurate measurements is critical to process control, billing, and system efficiency. Uneven or turbulent flow can interfere with the reading of the flowmeter, so that measurement errors are caused, the acquisition requirement of the turbulent flow component on the short-distance stable and accurate flow metering signal is difficult to meet, and the influence of an unstable flow field on the accurate metering of fluid can be completely eliminated by generally using a straight pipe with the pipe diameter length of tens times or even hundreds times. In order to effectively eliminate the influence of the devices on the flow field of the local pipeline, a method of adding a long straight pipe section with a sufficient distance or adding a rectifier to the front end of the flowmeter is generally adopted, and the requirement of adding the long straight pipe section on space and cost is too high, so that the method is difficult to realize in practical engineering application. The prior art discloses a variety of perforated plate rectifiers in which non-uniform fluid is typically rearranged through a perforated plate in order to create a uniform distribution of flow rate. The rectifiers can improve the distribution of fluid flow velocity under certain action due to the large length and size of the components, but the requirements that the length of the front and rear straight pipe sections does not influence the metering precision of the ultrasonic flowmeter cannot be met. Disclosure of Invention The embodiment of the application aims to provide a multistage composite rectifier, which is used for solving the problem of local flow instability caused by turbulent flow components such as bent pipes, valves, variable-section pipes and the like in a fluid pipeline conveying system in the related technology. The application can adjust the direction and speed distribution of fluid flow, reduce turbulence and non-uniformity in the flow, and improve the efficiency and effectiveness of the system. In a first aspect, an embodiment of the present application provides a multi-stage composite rectifier, including: The first-stage rectifying section comprises a first rectifying tube and a plurality of first-stage guide vanes, the plurality of first-stage guide vanes are uniformly and annularly distributed on the inner tube wall of the first rectifying tube around the central axis of the flow channel, and one end of each first-stage guide vane close to the central axis of the flow channel is suspended. The second-stage rectifying section comprises a second rectifying pipe and a plurality of second-stage guide vanes, the second-stage guide vanes are uniformly and annularly distributed on the inner pipe wall of the second rectifying pipe around the central axis of the flow channel, and the second-stage guide vanes are uniformly and alternately distributed and are connected at one position at one end close to the central axis of the flow channel. The third-stage rectifying section comprises a third rectifying pipe, a rectifying flow passage and rectifying holes, wherein the rectifying flow passage is provided with a plurality of rectifying flow passages, and the rectifying flow passages are provided with a plurality of rectifying holes. The first buffer section is communicated with the first-stage rectifying section and the second-stage rectifying section; and the second buffer section is communicated with the second-stage rectifying section and the third-stage rectifying section. Preferably, the diameter of the first buffer section is equal to the diameter of the joint of the first-stage rectifying section and the second-stage rectifying section connected with the two ends of the first buffer section, the diameter of the second buffer section is equal to the diameter of the joint of the second-stage rectifying section and the third-stage rectifying section connected with the two ends of the second buffer section, the lengths of the first buffer section and the second buffer section are both between 0.1d and 0.4d, and d is the diameter of the inlet of the first-stage rectifying section. Preferably, the length l 1 of the first stage guide vane is less than 0.5d, d is the diameter of the inlet of the first stage rectifying section, t