CN201810788U

CN201810788U - Improved structure of elastic sealing ring

Info

Publication number: CN201810788U
Application number: CN2010205243350U
Authority: CN
Inventors: 文平; 邓飞明; 盛洪; 蔡杰浩; 龙秀云
Original assignee: CHONGQING CHUANWU INSTRUMENT Co Ltd
Current assignee: CHONGQING CHUANWU INSTRUMENT Co Ltd
Priority date: 2010-09-10
Filing date: 2010-09-10
Publication date: 2011-04-27
Anticipated expiration: 2020-09-10

Abstract

The utility model provides the improved structure of an elastic sealing ring. The improvement lies in that: the circle central shaft of the central hole of the sealing ring is crossed with the rotating shaft of a parent cone; the circle central shaft is vertical to the end face of the sealing ring; the circle central shaft is unparallel to any side edge of the parent cone; and the included angle between the circle central shaft and the rotating shaft is smaller than half of the vertex angle of a triangle enclosed by the axial cross section of the parent cone. The structure has the advantages that: the ovality of the profile of the orthographic projection of the sealing ring is small; the ring with of the orthographic projection of the sealing ring is more uniform, and rigidity difference between different positions on the circumference of the ring is small; and the flexible deformation of the sealing ring is more uniform, the tight joint between the sealing ring and a valve seat face can be ensured without using a large torque, the sealing ring is prevented from being subjected to a large torque for a long time, and the service life of the sealing ring is prolonged.

Description

Elastic sealing ring improves structure

Technical field

The utility model relates to a kind of seal ring that is used for three eccentric butterfly valve, relates in particular to a kind of elastic sealing ring and improves structure.

Background technique

In the prior art, the seal ring that is used for three eccentric butterfly valve, its shape is more special, clear in order to set forth, we introduce " parent circular cone " this notion: referring to Fig. 1, suppose a cone, on cone, drill through a through hole, the circle core shaft of through hole is parallel with a certain incline on the shaft section of cone, and the running shaft of the circle core shaft of through hole and cone intersects, and is the base with this incline (parallel with the circle core shaft of through hole that), make two parallel vertical lines of this incline, by the ring bodies that vertical line intercepts out, be the shape that is used for the seal ring of three eccentric butterfly valve of the prior art, we just are defined as it parent circular cone of seal ring this cone, the orthographic projection of the external frame of this seal ring is oval, and the orthographic projection of its center hole (being formed on seal ring by the through hole on the parent circular cone) is for positive circular; The shaft section that seal ring gets by the plane, circle core shaft place of long axis of ellipse that its external frame encloses and center hole is a right-angled trapezium, the triangle that the extending line intersection point of the incline of this right-angled trapezium and right-angled trapezium base are enclosed is right-angled triangle, (this angle that is to say the angle of circle core shaft and running shaft to the angle of the circle core shaft of the endoporus of seal ring and the angular bisector (this angular bisector overlaps with the running shaft of parent circular cone) of right-angled triangle drift angle (end with right-angled trapezium is the end), those skilled in the art generally are referred to as " eccentric angle " or " degree of eccentricity ") number of degrees, equal the right-angled triangle drift angle 1/2 of the number of degrees.

This seal ring of the prior art, the ovality of the external frame of its orthographic projection is big, the width of the ring in the seal ring orthographic projection

Skewness, cause the stiffness difference of going up the diverse location place seal ring ring week big, and the gentle dynamic deformation of this seal ring is inhomogeneous, stickiness is poor, only could guarantee the tight applying of seal ring and valve seat under big moment loading, this will cause the seal pressure skewness on the sealant surface, causes damage thereby most sealing surface is crossed in the seal pressure part, simultaneously, the life-span of seal ring is also very limited.

The model utility content

For solving the problem in the background technique, the utility model proposes a kind of elastic sealing ring and improve structure, its improvement is: the running shaft of the circle core shaft of the center hole of seal ring and parent circular cone intersects, circle core shaft is vertical with the end face of seal ring, and circle core shaft is not parallel with any incline of parent circular cone, and the angle of circle core shaft and running shaft is less than 1/2 of the leg-of-mutton drift angle that shaft section enclosed of parent circular cone.

Useful technique effect of the present utility model is: the ovality of the external frame of seal ring orthographic projection is little, the width of the ring in the seal ring orthographic projection

More even, the stiffness difference that ring week is gone up the diverse location place is little; The gentle dynamic deformation of seal ring is more even, need not big moment loading and can guarantee and the tight applying of valve seat surface, has avoided seal ring to be in for a long time under the big moment loading, has prolonged the working life of seal ring.

Description of drawings

Fig. 1, seal ring of the prior art orthographic projection view;

Fig. 2, seal ring of the prior art are crossed the longitudinal section of seal ring external frame transverse; The AB section is the angular bisector of cone shaft section drift angle among the figure; As can be seen from the figure, the angle of circle core shaft and running shaft equals 1/2 of the triangle drift angle number of degrees;

Fig. 3, the utility model structure orthographic projection view;

The seal ring of Fig. 4, the utility model structure is crossed the longitudinal section of seal ring external frame transverse; The CD section is the angular bisector of cone shaft section drift angle among the figure; As can be seen from the figure, the angle of circle core shaft and running shaft is less than 1/2 of the triangle drift angle number of degrees; Longitudinal section.

Embodiment

In three eccentric butterfly valve, sealing surface is a conical surface, and for preventing movement interference, seal ring 1 adopts oblique cone, and in the prior art, the longitudinal section of all adopting the formed oval major axis of seal ring external frame is the seal ring 1 of right-angled trapezium; There is problems (existing introduction in detail in the background technique in the seal ring 1 of this structure, do not repeat them here), in order to address these problems, the utility model proposes a kind of seal ring that is used for three eccentric butterfly valve of new structure, in its structure, part same as the prior art is: the external frame of seal ring 1 orthographic projection is oval (because its ovality is very little, be difficult to almost from figure find out that it is oval), center hole is for positive circular, the running shaft of the circle core shaft of center hole and parent circular cone intersects, and circle core shaft is vertical with the end face of seal ring 1; The utility model is with the background technique difference: the circle core shaft of center hole is not parallel with any incline of parent circular cone, the angle of circle core shaft and running shaft (being the eccentric angle or the degree of eccentricity) is less than the leg-of-mutton drift angle that shaft section enclosed of parent circular cone

1/2, drift angle

Preferred value be 20 ~ 60 °, angle

Preferred value be 5 ~ 8 °.And in theory, the degree of eccentricity is more little, and the ovality of seal ring 1 external frame is also more little, and the seal ring external frame approaches just round more, the width of ring

More even, the also approaching more ideal of its structural parameter.

In order better to contrast with prior art, might as well use for reference the elaboration mode in the background technique, come the utility model is described: suppose a cone, on cone, drill through a through hole, the circle core shaft of through hole and the running shaft of cone intersect, but the circle core shaft of through hole is not parallel with any incline of cone, along with the direction (having guaranteed promptly that also circle core shaft is vertical with the end face of seal ring 1) of through hole transverse cross-section parallel, the cutting cone, the ring bodies of gained is the seal ring that is used for three eccentric butterfly valve of the present utility model, and this cone i.e. the parent circular cone of seal ring 1 for this reason.

From in appearance, the ovality of whole seal ring 1 is very little, almost can not differentiate, and this just makes the width of seal ring 1

More even, ring week is gone up the rigidity basically identical at diverse location place; The gentle dynamic deformation of seal ring 1 is more even, need not big moment loading and just can tightly fit with valve seat surface, and the life-span of seal ring 1 has obtained prolongation.

Claims

1. an elastic sealing ring improves structure, it is characterized in that: the circle core shaft of the center hole of seal ring (1) and the running shaft of parent circular cone intersect, circle core shaft is vertical with the end face of seal ring (1), and circle core shaft is not parallel with any incline of parent circular cone, and the angle of circle core shaft and running shaft is less than 1/2 of the leg-of-mutton drift angle that shaft section enclosed of parent circular cone.