CN2221138Y - Sealing ball valve with translational rotary single seat - Google Patents

Abstract

The utility model relates to a sealing ball valve with a horizontal movement rotary single seat. Two seats of an original ball valve are changed into a single valve seat. A valve ball which can not move is changed into a valve ball which is dialed by a dialing tongue which is positioned on a valve rod and is provided with an inclination angle to move horizontally and form a certain distance before rotating, the valve ball disengages from the friction of the valve seat, and the valve ball easily rotates to be opened. When the ball valve needs to be closed, the pressing surface at the back of the dialing tongue leads the valve ball which is in a closed position to be pressed towards the valve seat, and the pressing and sealing action is obtained. The dialing tongue uniformly passes through a spacing trough on the valve rod from top to bottom, which leads the height and the rotating angle of the valve rod to be controlled. The utility model has the advantages of little on-off torsional moment, simple and convenient assembly and maintenance, little wearing capacity, and reliable and stable sealing performance. The service life is greatly extended.

Description

The single seat back seal ball valve is rotated in translation

The utility model relates to a kind of ball valve, and particularly a kind of open and close torque is little, the single seat back seal ball valve is rotated in the reliable sealing translation.

Be widely used in the ball valve of industries such as oil, chemical industry, generating,, also come with some shortcomings though have advantages such as flow resistance coefficient is little, simple in structure, keying speed is fast.

1, open and close torque is big.Usually the ball valve of seeing is the bivalve stand structure, promptly respectively positions and seals by valve seat in the valve ball both sides.Valve ball is in the friction contact condition all the time in opening-closing process, rotatory force is bigger.This not only can cause valve ball, valve seat wearing and tearing, reduce working life, also can cause ball valve to leak.

2, assembly pretightening power is wayward.When applying pretightening force, must utilize pad, spring to adjust, cause pretightening force not of uniform size, and, bring a lot of troubles for the assembling maintenance because of the concentricity requirement height.

3, in the opening-closing process, pressure medium acts on the rear valve base by valve ball, valve seat loses the supporting of valve ball the preceding, under the effect of pressure medium, can produce distortion, when being rotated further ball valve again, the valve seat of distortion can be pushed by the valve ball channel edge once more, and this not only directly influences the keying of valve ball, also can influence the sealability and the working life of ball valve because of wearing and tearing, the valve ball that bites.

The purpose of this utility model is to provide a kind of open and close torque little, and sealability is reliable, finishing is convenient, the single seat back seal ball valve is rotated in the translation of long service life.

For achieving the above object, the technical solution of the utility model is as described below:

Comprising on the basic structure basis of the valve body of ball valve, valve seat, valve ball, valve gap, valve rod, handle, changing a valve seat into original two, be contained in the medium channel of valve body, the sphere of this valve seat and the sphere of valve ball coincide; The sphere centre of valve seat does not overlap with the axis of valve rod, and promptly the axis of the sphere centre of valve seat and valve rod mutually across a certain distance.In off position, the spacing of the axis of valve rod and valve seat end face is greater than the spacing of valve ball center and valve seat end face, here the closed position that is the requirement valve ball must be less than the distance of valve rod to the valve seat end face, and being beneficial to valve ball has a translation space to place, valve rod axle center when opening.

Group mouthful Spielpassung on group tongue of valve rod lower end and the valve ball, the face of the dialling valve seat sphere dorsad of group tongue, the pressure surface at group face and its back side all constitutes the angle of same true dip direction with the valve body symmetry plane.This group face should be in stem shaft when rising, and cooperating of mouth plane of inclination stirred that mind-set valve rod axis place moves in the valve ball with dialling in the plane of inclination that relies on the face of dialling.When closing, the plane of inclination of pressure surface when descending, utilizes mouthful plane of inclination of dialling that is mated that valve ball is pushed back valve seat sphere place with stem shaft.The pressure surface at the face of dialling and group face back side is plane or arcuation.

On the valve rod of dialling tongue top, have and the restraining groove that is fixed on the locating stud Spielpassung on the valve body.The purpose of restraining groove is exactly the trend of control valve rod and the angle of rotation.The top bilateral symmetry line parallel valve rod axis of restraining groove, bilateral symmetry wire-wound cylndrical surface, bottom spiral drops to 90 ° of corners.

During use, valve rod upper end and handle screw-thread fit, the rotation of handle moves axially valve rod up and down.During breakdown, handle turns clockwise, the qualification direction that valve gap utilizes restraining groove to cooperate with locating stud moves axially earlier, meanwhile, rely on the inclination angle of dialling tongue, impel valve ball translation certain distance, break away from valve seat, until its center and valve rod axis coinciding place, handle continues to turn clockwise, and makes the restraining groove that descends around the cylndrical surface spiral on the valve rod enter alignment pin position, rotates when valve rod is risen, turn to 90 ° by dialling the moving valve ball of lingual ribbon simultaneously, this moment, ball valve was in the complete opening shape.When the handwheel counterrotating, valve rod moves down, and under the effect of spirality restraining groove, the valve ball half-twist makes valve rod axially move down thereupon again, makes valve ball to the translation of valve seat place, and relies on the inclination angle of the pressure surface of dialling dorsal surface of tongue that valve ball is pushed back on the valve seat.

The utility model changes original two valve seats into single seat, utilize the pressure surface of dialling on the tongue that valve ball is pressed to valve seat simultaneously and play the tightening seal action, thereby the adverse effect of having avoided the distortion of valve seat the preceding and having brought not only can guarantee sealability effectively, has also prolonged working life simultaneously; Improving aspect the torque force, what the utility model owing to utilize was dialled tongue dials the face inclination angle, and the distance that the valve ball translation is certain when valve rod rises makes it break away from valve seat, and then changes 90 °, opens fully until ball valve.In the rotation process of valve ball (no matter be open or close) not with the sphere friction of valve seat, therefore the torque force that opens and closes becomes very little; Change another purpose of single seat into by two-seater, exactly comparatively complicated finishing technology further simplified, make assembling, overhaul more convenient, rapid.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the utility model valve rod partial structurtes schematic representation.

Fig. 3 is a structural relation schematic representation between the utility model valve rod, valve ball and the valve seat.

In Fig. 1, Fig. 2, Fig. 3.1. 15. groups of mouths of valve rod 2. handles, 3. valve gap 4. locating studs, 5. restraining groove 6. valve bodies, 7. valve seats 8. groups of tongues, 9. valve balls, 10. valve body symmetry plane 12. restraining groove bottoms, 11. restraining groove tops 13. groups of faces, 14. pressure surfaces, 16. valve seat end faces.

With reference to Fig. 1, Fig. 2, Fig. 3.Adorn a valve seat (7) at the medium channel internal fixation of valve body (6), its spherical diameter is identical with the valve ball diameter.The axis of valve rod (1) does not overlap with the sphere centre of valve seat, and a spacing is promptly arranged, and its purpose is exactly that the center of rotation of valve ball is not on the sphere centre of valve seat, to keep away friction.Bolt Connection between valve gap (3) and the valve body (6).On valve body or valve gap, adorn a locating stud (4), the width of the restraining groove (5) on its diameter and the valve rod (1) consistent and with the restraining groove Spielpassung.Be processed with one group of tongue in the valve rod lower end, dial mouthful (a 15) Spielpassung on it and the valve ball (9).The face (13) of dialling of dialling tongue (8) is valve seat sphere and constitute angle with valve body symmetry plane (10) dorsad, and when valve body moved up, the face of dialling was just stirred the valve ball translation and moved to the valve rod axis place, broke away from valve seat.When closing, rely on the pressure surface (14) of dialling tongue that valve ball is pressed to valve seat.The inclination direction of pressure surface (14) is consistent with group face inclination angle.Restraining groove is divided into two-part, the parallel valve rod of symmetrical line (1) axis of both sides, top (11), and bilateral symmetry wire-wound cylndrical surface, bottom (12) spiral drops to 90 ° of corners.So just define height and angle of swing that valve rod rises, prior is exactly the distance that limits the valve ball translation by the height of dialling the rising of face inclination angle and valve rod, even the rotating center of valve ball moves to coincidence place of valve rod axis, valve ball is rotated.Certainly the distance of this translation is very little, just can achieve the goal between 0.5～3 millimeter.

Valve seat end face (16) is in this reference point of position for illustrative purposes only.

Claims (4)

1, the single seat back seal ball valve is rotated in a kind of translation, comprise valve body (6), valve seat (7), valve ball (9), valve rod (1), valve gap (3), handle (2), it is characterized in that: a valve seat (7) is housed in the medium channel of valve body (6), and the sphere of its sphere and valve ball coincide; The sphere centre of valve seat does not overlap with valve rod (1) axis; The valve rod lower end is processed with one group of tongue (8), dials mouthful (a 15) Spielpassung on it and the valve ball (9); On the valve rod of dialling tongue top, have and the restraining groove (5) that is fixed on locating stud (4) Spielpassung on the valve body.

2, the single seat back seal ball valve is rotated in the described translation of root a tree name claim 1, and it is characterized in that: in off position, the spacing of the axis of valve rod (1) and valve seat end face (16) is greater than the spacing of valve ball center and valve seat end face (16).

3, the single seat back seal ball valve is rotated in the described translation of root a tree name claim 1, it is characterized in that: the face (13) of dialling of dialling tongue (8) is valve seat sphere and constitute angle with valve body symmetry plane (10) dorsad; The back side of the face of dialling is that pressure surface (14) constitutes angle with valve body symmetry plane (10); The face of dialling and pressure surface are plane or arc surfaced.

4, the single seat back seal ball valve is rotated in the described translation of root a tree name claim 1, and it is characterized in that: the parallel valve rod of symmetrical line (1) axis of the both sides, top of restraining groove (5), the symmetrical line of both sides, bottom drops to 90 ° of corners around the cylndrical surface spiral.