CN201835792U

CN201835792U - Kelly cock valve

Info

Publication number: CN201835792U
Application number: CN201020256763XU
Authority: CN
Inventors: 杜爱莲
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-13
Filing date: 2010-07-13
Publication date: 2011-05-18
Anticipated expiration: 2020-07-13

Abstract

A kelly cock valve is capable of being opening and closed under pressure, and is characterized in that a lower valve seat seal ring, a lower valve seat, a lower valve seat limit ring, a ball valve, a switch knob, an upper valve seat limit ring, an upper valve seat, an upper valve seat seal ring, a seal support, a split ring, a split ring support ring and a snap spring are mounted in a valve body; the valve seat limit rings are disposed in a valve cavity, and limit movement distance of the pressurized-end valve seat, the ball vale is separated from the pressurized-end valve seat to form a clearance, a pressurized liquid enters the inner cavity of the ball valve along the clearance, pressures in the inner cavity of the ball valve and out of the ball valve are balanced, the ball valve cannot deform, friction resistance is reduced, and accordingly the purpose of opening and closing of the ball valve being pressurized is achieved.

Description

Kelly cock

Technical field

The utility model relates in a kind of petroleum drilling operation, is installed in kelly bar top or bottom, when in the well drilling tool being arranged, can close and open the drilling tool internal channel, prevents a kind of safety device of gas blowout accident.

Background technology

At present, known kelly cock is made up of cock body, center ring, assembly ring, last lower valve base, ball valve, sealing ring, spring etc., relies on fitting tightly of ball valve and last lower valve base to realize sealing when ball valve is closed pressurized.Move axially but produce during the ball valve pressurized, last lower valve base also moves thereupon, and the ball valve inner chamber is in pressured state all the time, forms pressure reduction with ball valve is outside, thereby makes the ball valve distortion serious, produces very big frictional resistance, makes ball valve switch difficulty when pressurized; Last lower valve base is fitted with the shape of the conical surface and ball valve, makes the diameter of contact surface of ball valve and last lower valve base bigger, stressed axis angle increase, also increased the frictional resistance of ball valve, ball valve can not be opened at pressured state, can not effectively prevent blowout, realize purpose of safety.

Summary of the invention

In order to overcome the deficiency of existing kelly cock switch difficulty when the pressurized, the utility model provides a kind of kelly cock.This device ball valve under pressured state can be opened, and can effectively prevent blowout, realizes purpose of safety.

The technical scheme that its technical problem that solves the utility model adopts is: at the faucet valve inner chamber, the two ends of ball valve switch turn-knob respectively increase by a valve seat spacing ring, compression ball valve bearing end valve seat insert during the ball valve pressurized, ball valve and pressurized end valve seat are produced to be moved axially, limited loop resistance retaining when pressurized end valve seat moves to the spacing ring position, stop to move, ball valve continues to move, ball valve and pressurized end valve seat are broken away from, produce the gap, pressure fluid enters the ball valve inner chamber, ball valve inner chamber and ball valve external pressure balance, ball valve does not produce distortion, reduces frictional resistance; Valve seat is fitted with the arc shape identical with ball valve, and cambered surface reduces the diameter of the binding face of ball valve and valve seat at the valve seat bore edge, stressed axis angle reduces, thereby reduces frictional resistance, makes the ball valve can be at the pressured state switch, effectively prevent blowout, realize purpose of safety.

The beneficial effects of the utility model are, can be at switch kelly cocks under the pressured state, and simple in structure.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the sectional structural map of the utility model in opening.

Fig. 2 is the utility model sectional structural map in off position.

1. cock bodies among the figure, 2. lower valve base sealing ring, 3. lower valve base, 4. lower valve base spacing ring, 5. ball valve, 6. switch turn-knob, 7. upper valve base spacing ring, 8. upper valve base, 9. upper valve base sealing ring, 10. sealing supporting base, 11. piece together ring, and 12. piece together ring bearing circles, 13. jump rings.

The specific embodiment

In Fig. 1, switch turn-knob (6) is contained in the hole of cock body (1) side, lower valve base sealing ring (2) is contained in the end face of lower valve base (3), lower valve base (3) is contained in the below of (1) in the cock body, the carrying cambered surface upwards, lower valve base spacing ring (4) is contained in the groove of below in the cock body (1), ball valve (5) is contained in lower valve base (3) top, the rotation opening cooperates with switch turn-knob (6), upper valve base sealing ring (9) is contained in the end face of upper valve base (8), in the groove of upper valve base spacing ring dress (7) ball valve (5) top in cock body (1), sealing supporting base (10) is contained in upper valve base (8) top, assembly ring (11) is contained in the groove of top in the cock body (1), pieces together ring bearing circle (12) and is contained on assembly ring (11) interior garden, and jump ring (13) is contained in the last square groove of piecing together ring (11).Kelly cock is in opening, and inner chamber does not have pressure, and ball valve and last lower valve base are fitted, the sealing ring slight deformation, and ball valve and valve seat do not stress.

In embodiment illustrated in fig. 2, in petroleum drilling operation, when in the well overflow or blowout taking place, the kelly cock pressurized that makes progress, close ball valve (5), pressure forces ball valve (5) and lower valve base (3) to move up, and upper valve base sealing ring (9) is compressed the generation displacement.When being moved upwards up to lower valve base spacing ring (4), lower valve base (3) stops when contacting moving, ball valve (5) continues to move up, cause the ball valve (5) and the applying of lower valve base (3) to break away from, produce the gap, pressure fluid enters ball valve (5) inner chamber, make ball valve (5) internal and external pressure balance, thereby greatly reduce the distortion of ball valve (5) under pressured state, reduce frictional resistance, make the ball valve can be at the pressured state switch, effectively prevent blowout, realize purpose of safety.

Claims

1. a kelly cock is equipped with the lower valve base sealing ring, lower valve base in valve body, the lower valve base spacing ring, ball valve, switch turn-knob, the upper valve base spacing ring, upper valve base, upper valve base sealing ring, sealing supporting base, piece together ring, piece together the ring bearing circle, jump ring is characterized in that: body cavity is equipped with two valve seat spacing rings.

2. kelly cock according to claim 1 is characterized in that: valve seat is fitted with the arc shape identical with ball valve, and cambered surface is at the valve seat bore edge.