CN2307962Y

CN2307962Y - Ball valve

Info

Publication number: CN2307962Y
Application number: CN 97236666
Authority: CN
Inventors: 陈建明; 王佩永
Original assignee: SHIHUA METERS FACTORY ZHANGJIAGANG CITY
Current assignee: SHIHUA METERS FACTORY ZHANGJIAGANG CITY
Priority date: 1997-07-23
Filing date: 1997-07-23
Publication date: 1999-02-17
Anticipated expiration: 2007-07-23

Abstract

The utility model discloses a ball valve. In the utility model, on the basis of an original ball valve, a square shaft shoulder is arranged between an upper and a lower shafts of a ball core and between an upper and a lower shafts of a ball body respectively; the two square shaft shoulders are respectively provided with a characteristic cam; when the pair of cams rotates along with the ball core, two valve seats can be driven to be connected with or disconnected from the ball body; so the valve seats can not contact the ball core at the time of relative motion, the abrasion can be avoided, and a sealing port can be effectively protected from damaging; so the sealing property and the service life of the ball valve can be improved.

Description

Ball valve

The utility model relates to a kind of ball valve.

Ball valve is widely used in various pipes and installs, and is used for flow, pressure of controlling plumbing fixtures inner fluid etc.The structure of existing ball valve comprises: valve body, be contained in the valve body chamber with going up the ball core that lower shaft and center have through hole, two valve seats relative with the ball core respectively are equipped with at passage two ends in the valve body cavity, two valve seats in the form of a ring, the center has through hole, the face relative with the ball core is interior concaved circular cambered surface, the back side of each valve seat is equipped with one group of blind hole, a stage clip all is housed in each blind hole to withstand in the groove on the step plane of valve channel, a seal ring respectively is housed between the circumferential surface of two valve seats and the fitting surface of valve body, bottom in the valve body cavity is inlaid with an axle sleeve, the lower shaft of ball core and this axle sleeve are rotatably assorted, be provided with a valve gap at the valve body top, the center of valve gap is provided with a through hole, be provided with one group of ring shaped slot in the through hole, filler is housed in the groove, in the step hole of valve gap through hole bottom, be inlaid with an axle sleeve, the upward axle of ball core passes from this axle sleeve and filler and is rotatably assorted mutually, a packing ring is arranged between valve gap and the valve body, and valve gap and packing ring are fastening with one group of bolt and valve body.As long as the rotating sphere core changes the through hole of ball core and the through hole mutual alignment of two valve seats, just can realize the keying of ball valve.No matter ball valve opens or closes, and under the stage clip effect at the valve seat back side, the interior concaved circular cambered surface of the spheroid of ball core and two valve seats remains and is in contact with one another.This ball valve in use, because the spheroid of ball core and the interior concaved circular cambered surface of valve seat remain and are in contact with one another, in when, between them relative movement taking place, friction can take place inevitably and produce wearing and tearing, thereby make the sealed mouth between the arc surface of the spheroid of ball core and two valve seats damage or produce the gap, cause escape of liquid, make sealing reduction, the lost of life of ball valve.

The purpose of this utility model is: thus provide a kind of spheroid of ball core and the arc surface of two valve seats in relative movement, not to produce friction, prevent that escape of liquid from improving the ball valve of its sealing.

The technical solution of the utility model is: on the basis of original ball-valve structure, a square shaft shoulder is respectively set up in the junction of lower shaft and ball core spheroid on the ball core, two square shafts shoulders combines as a whole with the cylindrical body and the ball core of last lower shaft respectively, upper and lower shaft shoulder place respectively is equipped with one and has center square hole and characteristic cam that each is measure-alike, and the curved surface of two characteristic cams is between two valve seats.When the ball core drove the characteristic cam rotation, the curved surface of two characteristic cams cooperated the stage clip at the two valve seat back sides, and the interior concaved circular cambered surface that can promote two valve seats is done relative clutch campaign with the spheroid of ball core.

Advantage of the present utility model is: ball valve does not contact during relative movement between the interior concaved circular cambered surface of the spheroid of ball core and valve seat in opening-closing process, avoids producing wearing and tearing, thereby has protected sealed mouth not to be damaged effectively, has improved the sealing of ball valve.

Below in conjunction with accompanying drawing the utility model is described in further detail:

Fig. 1 is the structure sectional view of the utility model ball valve;

Fig. 2 be among Fig. 1 along A-A line direction, the work view of last characteristic cam.

As Fig. 1, shown in 2, in the chamber of valve body 17, be equipped with and be with

lower shaft

5,14 and the center have the ball core 16 of through hole, two the ring-type valve seats 11 relative with ball core 16 respectively are equipped with at passage two ends in valve body 17 cavitys, 18, two valve seats 11,18 centers have through hole, the face relative with ball core 16 is interior concaved circular cambered surface, two valve seats 11,18 the back side is equipped with one group of blind hole, a stage clip 10 all is housed in each blind hole to withstand in the ring shaped slot on the step plane of valve body 17 passages, two valve seats 11, a seal ring 9 respectively is housed between the fitting surface of 18 circumferential surface and valve body 17, two valve seats 11,18 can do straight reciprocating motion in the passage of valve body 17, bottom in valve body 17 cavitys is inlaid with an axle sleeve 13, the lower shaft 14 and the axle sleeve 13 of ball core 16 are rotatably assorted, be provided with a valve gap 1 at valve body 17 tops, the center of valve gap 1 is provided with a through hole, be provided with two ring shaped slots in the through hole, filler 4 is housed in the groove, in the step hole of valve gap 1 through hole bottom, be inlaid with an axle sleeve 3, the upward axle 5 of ball core 16 passes from axle sleeve 3 and filler 4 and is rotatably assorted mutually, a packing ring 2 is arranged between valve gap 1 and the valve body 17, valve gap 1 and packing ring 2 are fastening with one group of bolt 8 and valve body 17, lower shaft 5 on

ball core

16,14 respectively establish a square shaft with the junction of ball core 16 spheroids takes on 6,15, two

square shafts shoulder

6,15 respectively with last

lower shaft

5,14 cylindrical body and ball core 16 combine as a whole, the upper and

lower shaft shoulder

6,15 places respectively are equipped with a band center square hole and characteristic cam 7 that each is measure-alike, 12, two characteristic cams 7,12 curved surface is in two valve seats 11, between 18.

Fig. 2 is described to be, the working state of characteristic cam 7, and characteristic cam 7,12 is owing to combining as a whole with spheroid, so the orientation of two characteristic cam 7,12 rotations is consistent.

In Fig. 1,2, when roating sphere core 16, drive two characteristic cams 7,12 by two

square shaft shoulders

6,15 and rotate 0 °-180 °, the curved surface of characteristic cam 7,12 is contacted with two valve seats 11,18 gradually, disengage fully until the inner arc surface of two valve seats 11,18 and the spheroid of ball core, at this moment, ball valve is opened; When the ball core rotates 180 °-0 ° or 180 °-360 ° again, the curved surface of characteristic cam 7,12 is disengaged with two valve seats 11,18 gradually, contact fully with the spheroid of ball core until the inner arc surface of two valve seats 11,18, at this moment, ball valve is closed.

The utility model is not limited to above-mentioned a kind of embodiment, the relation of angle that the characteristic cam curve of upper and lower characteristic cam 7,12 rotates according to ball core 16 and flow, pressure, temperature level can be designed as the characteristic curve of other shape, as long as use cam structure herein, all in scope of the present utility model.

The utility model is applicable to various ball valves.

Claims

1, a kind of ball valve, comprise valve body, valve seat, stage clip, ball core, valve gap, filler, axle sleeve, packing ring, bolt, it is characterized in that: be positioned at the last lower shaft of valve body inner spherical core and the junction of ball core spheroid and respectively establish a square shaft shoulder, two square shafts shoulders combines as a whole with the cylindrical body and the ball core of last lower shaft respectively, upper and lower shaft shoulder place respectively is equipped with one and has center square hole and characteristic cam that each is measure-alike, and the curved surface of two characteristic cams is between two valve seats.