CN105370646A - Composite seal structure for valve - Google Patents

Abstract

The invention discloses a composite seal structure for a valve. The composite seal structure comprises an inner seal ring and an outer seal ring. The outer seal ring comprises an inner circumference face, an outer circumference face coaxial with the inner circumference face and end faces located on the two sides of the inner circumference face and the outer circumference face. The outer seal ring further comprises two outer conical faces coaxial with the inner circumference face, and the two outer conical faces are each connected with the edges of one end of the outer circumference face and one end face; and the diameter of the end faces is smaller than the diameter of the outer circumference face. According to the composite seal structure for the valve, through the outer conical face on the outer surface of the outer seal ring, the outer conical face enables the diameters at positions, located at the two ends, of the outer seal ring to be reduced. When the composite seal structure moves in a valve shell along with a valve element, on the one hand, the outer seal ring can conveniently skip over a liquid passing hole in a valve shell; and on the other hand, the contact area between the outer seal ring and the liquid passing hole can be reduced, and abrasion of the outer seal ring can be reduced, so that the seal effect of the composite seal structure can be improved, the service life of the composite seal structure can be prolonged, and finally, the performance of sealing between the valve element and the valve shell can be improved.

Description

A kind of valve compound sealing structure

Technical field

The invention belongs to coal mine fully-mechanized mining technical field of hydraulic elements, specifically, the present invention relates to a kind of valve compound sealing structure.

Background technique

At present, be applied to each hydraulic element in the oil hydraulic circuit of coal mine fully-mechanized mining hydraulic support, as manually operated valve group, in order to improve sealing effect between valve casing and spool, general employing compound sealing structure, compound sealing structure is made up of the larger exterior seal ring of the less inner seal ring in inner side and outside.Owing to being provided with the liquid pass hole allowing pressured fluid pass through on valve casing, the surface of liquid pass hole and exterior seal ring can produce friction, causes exterior seal ring easily damaged, affects working life and the sealing effect of sealing configuration, and then can cause defective valve.

Summary of the invention

The invention provides a kind of valve compound sealing structure, object improves working life and sealing effect.

To achieve these goals, the technological scheme that the present invention takes is: a kind of valve compound sealing structure, comprise inner seal ring and exterior seal ring, exterior seal ring comprises inner peripheral surface, the outer peripheral surface coaxial with inner peripheral surface and is positioned at the end face of inner peripheral surface and outer peripheral surface both sides, described exterior seal ring also comprises two outer conical surface coaxial with described inner peripheral surface, two outer conical surface respectively with one end of described outer peripheral surface and the edge conjunction of a described end face, the diameter of end face is less than the diameter of outer peripheral surface.

Described inner peripheral surface is provided with the locating slot for holding described inner seal ring.

Described locating slot is along the annular positioning groove that whole circumference extends on described inner peripheral surface.

The vertical sectional shape of described locating slot is arc.

Described locating slot is positioned at the middle position of described inner peripheral surface.

The cone angle of described outer conical surface is 40 degree.

The material of described exterior seal ring is nylon.

Described inner seal ring is O type circle.

The material of described inner seal ring is rubber.

Valve compound sealing structure of the present invention, by the outer conical surface arranged at the outer surface of exterior seal ring, outer conical surface makes the diameter of exterior seal ring at end positions place reduce, when compound sealing structure moves in valve casing along with spool, be convenient on the one hand exterior seal ring and slip over liquid pass hole on valve casing, the area of contact with liquid pass hole can be reduced on the other hand, reduce the wearing and tearing of exterior seal ring, thus sealing effect and the working life of compound sealing structure can be improved, finally can improve the sealability between spool and valve casing.

Accompanying drawing explanation

This specification comprises the following drawings, shown content respectively:

Fig. 1 is the sectional view of compound sealing structure of the present invention;

Fig. 2 is the sectional view of exterior seal ring;

Fig. 3 is A place enlarged view in Fig. 2;

Fig. 4 is the sectional view of the manually operated valve group mangetic core assembly adopting compound sealing structure of the present invention;

Fig. 5 is B place enlarged view in Fig. 4;

Be labeled as in figure:

1, exterior seal ring; 11, inner peripheral surface; 12, outer peripheral surface; 13, outer conical surface; 14, locating slot; 15, trunk portion; 16, prismoid section; 17, end face; 2, inner seal ring.

Embodiment

Contrast accompanying drawing below, by the description to embodiment, be described in further detail the specific embodiment of the present invention, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present invention, technological scheme, and contribute to its enforcement.

As shown in Figure 1 to Figure 3, a kind of valve compound sealing structure of the present invention is the mangetic core assembly for manually operated valve group, improves spool and is enclosed within the sealability between the valve casing outside spool.This valve is be made up of inner seal ring 2 and the exterior seal ring 1 be enclosed within outside inner seal ring 2 with compound sealing structure, exterior seal ring 1 entirety is in cirque structure, center is provided with circular hole, exterior seal ring 1 comprises an inner peripheral surface 11, outer peripheral surface 12 and is positioned at the end face 17 of inner peripheral surface 11 and outer peripheral surface 12 both sides, inner peripheral surface 11 is coaxial with outer peripheral surface 12, end face 17 is disk, two end faces 17 parallel, and coaxial with inner peripheral surface 11, and two end faces 17 are connected with one end of inner peripheral surface 11 respectively.Exterior seal ring 1 also comprises two outer conical surface 13 coaxial with inner peripheral surface 11, two outer conical surface 13 respectively with one end of outer peripheral surface 12 and the edge conjunction of an end face 17, namely outer conical surface 13 lays respectively between outer peripheral surface 12 and an end face 17, the diameter of end face 17 is less than the diameter of outer peripheral surface 12, namely the bigger diameter end of outer conical surface 13 is connected with outer peripheral surface 12, and miner diameter end is connected with end face 17.Outer peripheral surface 12 position is the trunk portion 15 of exterior seal ring 1, and two ends outer conical surface 13 position is the prismoid section 16 at exterior seal ring 1 two ends, and outer conical surface 13 makes the two ends of exterior seal ring 1 conically.As shown in Figure 4 and Figure 5, be enclosed within the compound sealing structure on spool move in valve casing with spool time, the outer peripheral surface 12 of exterior seal ring 1 contacts with the internal surface of valve casing, to move to the liquid pass hole position on valve casing with spool at exterior seal ring 1, the two ends of exterior seal ring 1 are conical, thus the end of exterior seal ring 1 can be avoided directly to contact with liquid pass hole, such one side is convenient to exterior seal ring 1 and is slipped over liquid pass hole on valve casing, the area of contact of exterior seal ring 1 and liquid pass hole can be reduced on the other hand, reduce the wearing and tearing that liquid pass hole causes exterior seal ring 1, thus sealing effect and the working life of this compound sealing structure can be improved, finally can improve the sealability between spool and valve casing.

Specifically, the inner peripheral surface 11 of exterior seal ring 1 is also provided with one for holding the locating slot 14 of inner seal ring 2, this locating slot 14 is along the annular positioning groove 14 that whole circumference extends on inner peripheral surface 11, and the vertical sectional shape of locating slot 14 is arc, its radian is about 80 degree, to adapt to the shape of inner seal ring 2.Inner seal ring 2 has certain elasticity, it is arranged on the inside of exterior seal ring 1, exterior seal ring 1 radially distending can be made, because spool is moveable, the sidewall of valve casing is provided with liquid pass hole, spool is entered through valve casing liquid pass hole at pressured fluid, when spool moves and liquid pass hole is alignd with exterior seal ring 1, the pressured fluid that liquid pass hole overflows can form erosion to the outer peripheral surface 12 of exterior seal ring 1, pressure is produced to exterior seal ring 1, and then exterior seal ring 1 can be made to have the trend of radially shrinking, and inner seal ring 2 embeds in locating slot 14 and applies active force to exterior seal ring 1, exterior seal ring 1 can be made to keep the trend outwards expanded, thus exterior seal ring 1 is contacted with valve casing internal surface tightr, weaken the pressured fluid that overflows in the liquid pass hole of valve casing to the erosion of exterior seal ring 1, thus sealing reliability and the working life of exterior seal ring 1 can be improved further, sealability can be improved further.Meanwhile, the prismoid section 16 at exterior seal ring 1 two ends also has certain guide functions to the pressured fluid overflowed from liquid pass hole.

As shown in Figure 2, as preferably, locating slot 14 is positioned at inner peripheral surface 11 middle position in the axial direction, outer peripheral surface 12 is also the neutral position corresponding to inner peripheral surface 11, and locating slot 14 width is vertically greater than the width of outer peripheral surface 12, thus guarantee the inner seal ring 2 that locating slot 14 can hold thickness and is greater than outer peripheral surface 12.Therefore locating slot 14 is arranged on the middle position of inner peripheral surface 11, area of contact between inner seal ring 2 and exterior seal ring 1 is large, active force is strong, can guarantee that the trunk portion 15 of exterior seal ring 1 keeps larger area of contact with valve casing internal surface, can improve sealing effect further.

As preferably, the cone angle of two outer conical surface 13 is 40 degree, and 40 degree is conventional chamfer dimesion.

As preferably, inner seal ring 2 is the O RunddichtringO adopting quality of rubber materials to make, and has certain elasticity.The material of exterior seal ring 1 is nylon, and the seal ring of nylon material has the advantage that intensity is high, precision is high and wear resistance is good, has higher working life and sealing effect.

Below by reference to the accompanying drawings to invention has been exemplary description.Obviously, specific implementation of the present invention is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technological scheme is carried out; Or without improvement, above-mentioned design of the present invention and technological scheme directly applied to other occasion, all within protection scope of the present invention.

Claims (9)

1. a valve compound sealing structure, comprise inner seal ring and exterior seal ring, exterior seal ring comprises inner peripheral surface, the outer peripheral surface coaxial with inner peripheral surface and is positioned at the end face of inner peripheral surface and outer peripheral surface both sides, it is characterized in that: described exterior seal ring also comprises two outer conical surface coaxial with described inner peripheral surface, two outer conical surface respectively with one end of described outer peripheral surface and the edge conjunction of a described end face, the diameter of end face is less than the diameter of outer peripheral surface.

2. valve compound sealing structure according to claim 1, is characterized in that: described inner peripheral surface is provided with the locating slot for holding described inner seal ring.

3. valve compound sealing structure according to claim 2, is characterized in that: described locating slot is along the annular positioning groove that whole circumference extends on described inner peripheral surface.

4. valve compound sealing structure according to claim 3, is characterized in that: the vertical sectional shape of described locating slot is arc.

5., according to the arbitrary described valve compound sealing structure of claim 2 to 4, it is characterized in that: described locating slot is positioned at the middle position of described inner peripheral surface.

6. valve compound sealing structure according to claim 5, is characterized in that: the cone angle of described outer conical surface is 40 degree.

7. valve compound sealing structure according to claim 6, is characterized in that: the material of described exterior seal ring is nylon.

8. valve compound sealing structure according to claim 7, is characterized in that: described inner seal ring is O type circle.

9. valve compound sealing structure according to claim 8, is characterized in that: the material of described inner seal ring is rubber.