WO2016127564A1

WO2016127564A1 - Filler sealing structure

Info

Publication number: WO2016127564A1
Application number: PCT/CN2015/083829
Authority: WO
Inventors: 张逸芳; 王建新; 张晓剑; 吴向前
Original assignee: 江苏神通阀门股份有限公司
Priority date: 2015-02-10
Filing date: 2015-07-11
Publication date: 2016-08-18
Also published as: CN104633263A

Abstract

Disclosed is a filler sealing structure. A filler is formed by mutual lamination of an upper filler layer (5), a middle filler layer (6), and a lower filler layer (7) via grooves and convex peaks. The lower surface of the upper filler layer (5) is provided with a first V-shaped groove (8). The upper surface of the middle filler layer (6) is provided with a first inverted-V-shaped convex peak (9) matching the first V-shaped groove (8). The lower surface of the middle filler layer (6) is provided with a second V-shaped groove (10). The upper surface of the lower filler layer (7) is provided with a second inverted-V-shaped convex peak (11) matching the second V-shaped groove (10). The grooves and the convex peaks are all asymmetric. That is to say, the inclination angle between the grooves and a fitting side of an inner hole of a stuffing box is equal to the inclination angle between the convex peaks and the fitting side of the inner hole of the stuffing box, and the inclination angle between the grooves and a fitting side of a valve rod is smaller than the inclination angle between the convex peaks and the fitting side of the valve rod, so that a cavity (12) is formed between the grooves and the convex peaks at the fitting side of the valve rod. The filler sealing structure has a reasonable structure and reliable sealing, is free of maintenance, and has a long service lifetime.

Description

Title of the invention: a packing sealing structure

Technical field

The present invention relates to a packing sealing structure.

Background technique

[0002] In the prior art non-metal V-type filler, the angle of the groove symmetry structure of the upper and middle fillers is 90°, the convex peak of the middle and lower fillers is symmetric, and the angle is usually 95°. The stuffing box of the valve body is pressed into the gland of the packing body, and the elastic deformation of the groove is adhered to the peak, so that the inner circumference of the middle and upper packings closely fits the valve stem, and the outer circumference is closely fitted with the inner wall of the stuffing box to achieve sealing. . The disadvantage is that with the change of the daytime, the elastic stress is attenuated, the sealing pressure is gradually reduced, and the sealing function is lost to a certain value. Second, the inner circumferential surface and the valve stem are relatively operated, and there is inevitably wear, which is bound to make the sealing ratio gradually Less.

technical problem

[0003] The object of the present invention is to provide a solution for a packing sealing structure with reasonable structure, reliable sealing and long service life.

Technical solution

The technical solution of the present invention is:

[0005] A packing sealing structure, comprising a valve stem, a valve body, a stuffing box disposed between the valve stem and the valve body, a packing gland disposed on the stuffing box, and a stuffing box filled with a filler, wherein: the filler is The upper filler layer, the middle filler layer and the lower filler layer are formed by overlapping the grooves and the peaks, and the lower surface of the upper filler layer is provided with a first V-shaped groove, and the upper surface of the middle filler layer is disposed with the first V-shaped groove a first inverted V-shaped peak, the second V-shaped groove is disposed on the lower surface of the middle filler layer, and the second inverted V-shaped peak is matched with the second V-shaped groove on the upper surface of the lower filler layer; The groove and the convex peak are all asymmetric, that is, the inclination angle of the groove and the convex peak and the fitting hole of the stuffing box are the same, and the inclination angle of the groove and the valve rod fitting side is smaller than the convex peak and the valve stem fitting side. The angle of inclination forms a cavity between the groove on the side of the valve stem and the peak.

Advantageous effects of the invention

Beneficial effect [0006] The structure of the invention is reasonable. After pressing the packing gland, the outer peripheral side of the packing is closely adhered to the inner wall of the stuffing box, and the inner peripheral side is closely attached to the outer circumference of the valve stem, but the cavities are formed due to the difference in the angle of the concavities and convexities. Therefore, the elasticity of the valve stem side is good, the sealing specific pressure is small, and the friction torque is small. In the working state, the medium pressure enters the cavity to form a self-operating sealing mechanism. The higher the working pressure, the more reliable the sealing, the maintenance-free, and the long service life.

Brief description of the drawing

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

1 is a schematic structural view of an embodiment of the present invention.

2 is a schematic structural view of an upper filler layer.

3 is a schematic structural view of a middle filler layer.

4 is a schematic structural view of a lower filler layer.

BEST MODE FOR CARRYING OUT THE INVENTION

[0012] A packing sealing structure comprises a valve stem 1, a valve body 2, a stuffing box 3 is arranged between the valve stem and the valve body, a packing gland 4 is arranged on the stuffing box, and the packing box is filled with a filler, and the packing is filled by The upper filler layer 5, the middle filler layer 6 and the lower filler layer 7 are formed by overlapping the grooves and the peaks. The lower surface of the upper filler layer is provided with a first V-shaped groove 8, and the upper surface of the middle filler layer is disposed first. a V-shaped groove is fitted with a first inverted V-shaped peak 9, a lower surface of the middle filler layer is provided with a second V-shaped groove 10, and an upper surface of the lower packing layer is provided with a second inverted V which is matched with the second V-shaped groove The peaks and the peaks are all in an asymmetrical form, that is, the grooves and the peaks are inclined at the same angle as the fitting side of the stuffing box (both are 45°), and the groove and the valve stem are fitted to the side. The inclination angle is smaller than the inclination angle of the convex peak and the valve rod fitting side (ie, α=β < 45°), so that the groove and the peak of the valve stem fitting side are formed.

Claims

Claim

[Claim 1] A packing sealing structure, comprising a valve stem, a valve body, a stuffing box disposed between the valve stem and the valve body, a packing gland disposed on the stuffing box, and a stuffing box filled with a filler, wherein: The filler is composed of an upper filler layer, a middle filler layer, a lower filler layer through a groove, and a peak is superposed on each other. The lower surface of the upper filler layer is provided with a first V-shaped groove, and the upper surface of the middle filler layer is disposed with the first V-shaped a first inverted V-shaped peak of the groove fit, a lower surface of the middle filler layer is provided with a second V-shaped groove, and an upper surface of the lower filler layer is provided with a second inverted V-shaped peak that cooperates with the second V-shaped groove; The grooves and the peaks are all asymmetric, that is, the grooves and the peaks have the same inclination angle as the fitting side of the stuffing box, and the inclined angle of the groove and the valve stem is smaller than the peak and the valve stem. The angle of inclination of the side forms a cavity between the groove on the side of the valve stem and the peak.