CN105587868A

CN105587868A - Valve rod sealing structure of synthesis gas butterfly valve

Info

Publication number: CN105587868A
Application number: CN201410597689.0A
Authority: CN
Inventors: 王建新; 黄赛荣; 杨海峰; 张周卫
Original assignee: Jiangsu Shentong Valve Co Ltd
Current assignee: Jiangsu Shentong Valve Co Ltd
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-05-18

Abstract

A valve rod sealing structure of a synthesis gas butterfly valve comprises a valve body, a valve rod, a packing assembly, a packing gland and a bearing. The valve rod is mounted in the valve body. The packing assembly is coaxially mounted on the valve rod. The bearing is mounted below the packing assembly. The packing assembly is compressed by the packing gland. The bearing is composed of an inner bearing ring and an outer bearing ring. The inner bearing ring is attached to the outer bearing ring, the attachment face is a conical face, and the conical angle of the attachment face is larger than a friction angle. A plurality of axial elastic grooves are evenly distributed in the inner bearing ring in the circumferential direction. The valve rod sealing structure has the beneficial effects that the valve rod can be automatically held by the bearing structure, it is guaranteed that the valve rod is in contact with the bearing all the time, the bearing capacity of the bearing in a high-pressure state is improved, and the reliability of reverse sealing of the valve is increased; and by means of the spring structure between the packing assembly and the bearing, a clearance generated by long-time wear to packing can be offset, full contact of the inner bearing ring and the valve rod is ensured, and the sealing performance of the valve rod is guaranteed.

Description

A kind of valve rod leak-proof structure of synthesis gas butterfly valve

Affiliated technical field

The present invention relates to a kind of hermetically-sealed construction, particularly relate to a kind of packing seal structure of valve rod.

Background technology

The synthesis gas butterfly valve using at present, the general gland that adopts of its valve stem packing sealing compresses filler assembly, due to the one-way compression of top gland, makes the stressed large of top filler, seal pressure is high, and bottom filler is stressed little, there is the situation that seal pressure is inhomogeneous, after long-play, can there is filler assembly wear phenomenon, cause the leakage at valve rod place, and in the time that top gland thrust is excessive, easily occur that valve rod kills phenomenon.

Summary of the invention

In order to overcome the above-mentioned shortcoming of existing hermetically-sealed construction, the invention provides a kind of valve rod leak-proof structure that can realize auto-compensation.

The technical solution adopted for the present invention to solve the technical problems is, a kind of valve rod leak-proof structure of synthesis gas butterfly valve, comprise valve body, valve rod, filler assembly, gland, bearing, valve rod is arranged in valve body, filler assembly is coaxially arranged on valve rod, bearing is equipped with in filler assembly below, gland compresses filler assembly, bearing is made up of inner-ring bearing and race bearing, inner-ring bearing and race bearing fit, and binding face is the conical surface, and the cone angle of the conical surface is greater than angle of friction, circumferential uniform many axial elastic troughs of described inner-ring bearing.

One elasticity original paper is also housed between bearing and filler assembly, between elasticity original paper and filler assembly and bearing, is separated by by dividing plate.

Elasticity original paper is dish spring, cylindrical spring or volute spring.

The invention has the beneficial effects as follows: adopt Combined type tapered bearing arrangement, can automatically hold valve rod tightly, ensure that valve rod contacts with bearing all the time, improve the bearing capacity of bearing high pressure conditions, and increase the oppositely reliability of sealing of valve, built-up shaft bearing structure has lengthened the supporting section of valve rod, and the rigidity of valve rod is increased, and has extended service life; Spring structure between filler assembly and bearing, can compensate filler because of the gap that long term wear produces, and guarantees again fully contacting of bearing inner race and valve rod, has ensured the sealing property at valve rod place.

Brief description of the drawings

Fig. 1 is the structural representation of embodiment;

Fig. 2 is A-A cutaway view in Fig. 1;

Fig. 3 is the schematic three dimensional views of parts 502 in Fig. 1.

In figure: 1. valve rod; 2. gland; 3. filler assembly; 4. valve body; 5. bearing; 501. race bearing; 502. inner-ring bearing; 6. dividing plate; 7. dish spring, 8. elastic groove.

Detailed description of the invention

As Fig. 1, 2, shown in 3, a kind of valve rod leak-proof structure of synthesis gas butterfly valve, comprise valve body 4, valve rod 1, filler assembly 3, gland 2, bearing 5, valve rod 1 is arranged in valve body 4, filler assembly 3 is coaxially arranged on valve rod 1, bearing 5 is equipped with in filler assembly 3 belows, gland 2 compresses filler assembly 3, bearing 5 is made up of inner-ring bearing 502 and race bearing 501, inner-ring bearing 502 fits with race bearing 501, and binding face is the conical surface, the cone angle of the conical surface is greater than angle of friction, circumferential uniform many axial elastic troughs 8 of inner-ring bearing 502, axial elastic trough 8 is arranged in upper port and the lower port of inner-ring bearing, and arranged crosswise one on the other, a dishful of spring 7 is also housed between bearing and filler assembly, dish spring 7 can also be replaced by other elasticity original papers herein, for example cylindrical spring or volute spring, between dish spring 7 and filler assembly 3 and bearing 5, be separated by by dividing plate 6.

Claims

1. the valve rod leak-proof structure of a synthesis gas butterfly valve, comprise valve body, valve rod, filler assembly, gland, bearing, valve rod is arranged in valve body, filler assembly is coaxially arranged on valve rod, bearing is equipped with in filler assembly below, gland compresses filler assembly, it is characterized in that: described bearing is made up of inner-ring bearing and race bearing, described inner-ring bearing and race bearing fit, and binding face is the conical surface, the cone angle of the described conical surface is greater than angle of friction, circumferential uniform many axial elastic troughs of described inner-ring bearing.

2. the valve rod leak-proof structure of synthesis gas butterfly valve as claimed in claim 1, is characterized in that: an elasticity original paper is also housed between described bearing and filler assembly, between described elasticity original paper and filler assembly and bearing, is separated by by dividing plate.

3. the valve rod leak-proof structure of synthesis gas butterfly valve as claimed in claim 1, is characterized in that: described elasticity original paper is dish spring, cylindrical spring or volute spring.