Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for selecting eccentric distance of rotational valve plate and double eccentric butterfly valve

A technology of eccentricity and rotary valves, which is applied in the direction of lifting valves, valve devices, engine components, etc., can solve the problems of inconvenient installation of valve plates, and achieve the effects of improving sealing performance, good sealing performance, and increasing torque pressing force

Inactive Publication Date: 2010-09-22
宜兴市甫生实业有限公司
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lower half shaft is installed from the bottom upward, which may cause inconvenience in the installation of the valve plate to the shell.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for selecting eccentric distance of rotational valve plate and double eccentric butterfly valve
  • Method for selecting eccentric distance of rotational valve plate and double eccentric butterfly valve
  • Method for selecting eccentric distance of rotational valve plate and double eccentric butterfly valve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 (Determining the eccentricity by mapping method): see figure 1 , 2 , The basic structure of butterfly valve is composed of valve plate 1, valve seat 2 and rotating shaft 3. The valve plate rotation valve eccentric distance selection area of ​​the present invention: take the diameter of the circular valve plate 1 perpendicular to the rotating shaft 3 to obtain the valve plate section 4, and the four vertices 5 on the left and right ends of the section 4 form an isosceles trapezoid , From the diagonal of the trapezoid as the vertical line of the waist to obtain the intersection point P, the intersection of the area above the vertical line of the upper angle and the area below the vertical line of the lower angle of the section-the shaded part (within the 2a angle), which is the rotation The range of the selected point of the axis eccentricity. The intersection point P of the two vertical lines is the minimum eccentricity e. Point O in the figure is the intersect...

Embodiment 2

[0031] Example 2 (determining the eccentricity by formula method): Set the butterfly valve diameter to be 3 inches (φ80mm), and the cone surface is sealed, then L=40mm, the thickness d of the valve plate sealing surface is 5.5mm, and the four vertices of the trapezoid are rounded to 1.5 mm (rounding can prevent the valve plate from scratching the valve ring), the trapezoid half-cone angle a is 25°. Calculated according to the aforementioned formula: left and right eccentricity e=5.5 / sin50=7.18mm (consistent with the drawing method): front and rear eccentricity h 1 =40*tga25+5.5 / 2+1.5*(1-sin25)=22.27mm.

Embodiment 3

[0032] Example 3: See image 3 , As in Example 1, the valve plate rotating handle 6 closes the locking pin 7 to form an eccentric structure (which becomes an eccentric pin shaft), with a rotating / plugging ring 7.1 at the upper end. The valve plate is closed, the eccentric pin 7 is inserted and rotated, and the eccentric structure of the pin generates a torque thrust to push the handle, so that the valve plate is pressed against the valve ring, thereby preventing leakage.

[0033] For large-diameter butterfly valves, the rotating shaft can be driven by a motor-driven turbine / worm headstock. The self-locking effect of the turbine / worm rod ensures that the valve plate is tightly closed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention aims to improve a method for selecting an eccentric distance of a rotational valve plate and in particular relates to the method for selecting the eccentric distance which has no interference friction when the rotational valve plate is closed. The method is characterized in that the eccentric distance is selected by geometric construction or determined by calculation of a formula method according to the claim 1. Compared with the prior art, the eccentric distance determining method of the invention greatly increases the eccentric distance and normally at least increases by more than twice. The large eccentric distance makes all sealing points on the valve plate are pressed toward a valve seat in an infinite approximation mode and makes the valve plate interference not exist in the rotational opening / closing process of the valve plate so as to overcome the defect of excessively small eccentric distance of the valve plate in the prior art fundamentally. After the valve plate is closed, the closeness of the valve plate is improved by increasing a torque force. A positioning support rod is arranged between an upper half shaft and a lower half shaft, so that the lower half shaft can be arranged from top to bottom and the installation of the valve plate is simplified.

Description

Technical field [0001] The invention relates to a method for selecting eccentricity without interference friction when a rotating valve plate, such as a butterfly valve, is closed, and a double-eccentric butterfly valve that uses this method to determine the eccentricity. Background technique [0002] The valve plate rotates to open / close the valve, such as butterfly valve (small eccentricity), swing valve (slightly far eccentricity), shaft valve (eccentricity infinity), a commonly used double eccentric shaft to reduce the valve plate to the valve ring when closing friction. The eccentricity of the existing double eccentric butterfly valve is usually small due to different methods. For example, the eccentricity e of a 3-inch butterfly valve is usually only about 2mm, 5-6 inches: e=3mm; 8-12 inches: e=4mm; 400mm-600mm : E=5-6mm. The eccentricity of the valve plate rotation is too small. When the rotation is closed / opened, the valve plate sealing surface will produce interference...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F16K1/36F16K1/22F16K1/32
Inventor 汤崇渝徐盘康徐勇
Owner 宜兴市甫生实业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com