CN2204852Y

CN2204852Y - Self-locking shaft collar

Info

Publication number: CN2204852Y
Application number: CN 94217668
Authority: CN
Inventors: 符国江; 刘达林; 梁汝清
Original assignee: OIL TESTING DIVISION OF XINJIANG PETROLEUM ADMINISTRATIVE BUREAU
Current assignee: OIL TESTING DIVISION OF XINJIANG PETROLEUM ADMINISTRATIVE BUREAU
Priority date: 1994-08-02
Filing date: 1994-08-02
Publication date: 1995-08-09
Anticipated expiration: 2004-08-02

Abstract

The utility model discloses a self-lock wellhead gate used for oil wells and oil fields, which is mainly composed of a valve body (10), a valve rod (9), a valve cover (8), a bearing seat (5), a hand wheel (1), etc. The utility model is characterized in that the seat body of the bearing seat (5) is provided with a thread through hole whose inner portion is provided with a top screw (4). When the screw (4) is tightly screwed, the valve rod (9) is tightly pushed and can not be rotated through the hand wheel (1). The utility model can avoid the accident that an underground steel wire or a cable was cut apart caused by the false operation with small change on the prior gate.

Description

Self-locking shaft collar

The utility model relates to a kind of oil well well head gate.

At present, other gate is general on paraffin valve on the well recovery tree and the well head, after the workman passes through steel wire or cable lower going-into-well with downhole probe, because downhole instrument generally needs work a few hours to a couple of days in well, so during this period, possible maloperation of other personnel and close paraffin valve, cause the steel wire (or cable) of going into the well to be cut off, instrument is fallen in the well, will influence the normal operation of next procedure like this or influence crude output, simultaneously also can be with instrument damage.

The purpose of this utility model is a kind of well head gate with self-locking mechanism of design, makes it can steel wire not take place in the underground work process or cable is cut off accident.

The utility model is to open a tapped through hole on the pedestal of the bearing support (5) at existing paraffin valve, on this tapped through hole, adorn a jackscrew (4), when jackscrew (4) when screwing, jackscrew (4) is with valve rod (9) dieback, making it pass through handwheel (1) can't rotate, and reaches to prevent to make valve plate (11) cut off the purpose of go into the well steel wire or cable because of maloperation.

Advantage of the present utility model is: 1, owing to adopted retaining mechanism, avoided causing valve plate to be cut off going into the well because of maloperation the generation of steel wire or cable fault; 2, the utility model is improved on the basis of existing paraffin valve, implements very easily simple.

Accompanying drawing partly cuts open figure for the utility model master looks.

The utility model is further specified as follows below in conjunction with accompanying drawing:

As shown in the figure: the utility model is made up of valve body (10), valve rod (9), valve gap (8), handwheel (1) etc., the bottom of valve rod (9) is by the valve plate that has been threaded (11), and valve plate (11) cooperates formation to seal with the valve seat (12) of valve body (10) inner chamber when being in closed condition; Valve body (10) top is connected with valve gap (8) by screw thread, on the interior step on valve gap (8) top packing (7) is arranged, and packing (7) is fixing by packing gland (6); By being threaded, bearing (3) is housed in the bearing support (5) between valve gap (8) and the bearing support (5), handwheel (1) is equipped with on the top of valve rod (9); Have a tapped through hole on the pedestal of bearing support (5), jackscrew (4) is housed in this tapped through hole, jackscrew (4) with valve rod (9) dieback, makes it can not pass through handwheel (1) and rotates when screwing.

In order to increase the frictional force between jackscrew (4) and the valve rod (9), the position of going up corresponding to jackscrew (4) at valve rod (9) processes one section coarse annular knurl (13).In addition for fear of the generation of aboveground stolen incident, the rear portion of jackscrew (4) can also be processed into irregularly shapedly, it must just can be outwarded winding with special tool.

Claims

1, a kind of self-locking well head gate, by valve body (10), valve rod (9), valve gap (8), handwheel compositions such as (1), the bottom of valve rod (9) is by the valve plate that has been threaded (11), valve plate (11) cooperates formation to seal with the valve seat (12) of valve body (10) inner chamber when being in closed condition, valve body (10) top is connected with valve gap (8) by screw thread, on the interior step on valve gap (8) top packing (7) is arranged, packing (7) is fixing by packing gland (6), between valve gap (8) and the bearing support (5) by being threaded, bearing (3) is housed in the bearing support (5), handwheel (1) is equipped with on the top of valve rod (9), it is characterized in that having a tapped through hole on the pedestal of bearing support (5), jackscrew (4) is housed in this tapped through hole, and jackscrew (4) with valve rod (9) dieback, can not rotate it when screwing.

2, self-locking well head gate according to claim 1 is characterized in that on valve rod (9), is processed with one section coarse annular knurl (13) corresponding to the position of jackscrew (4).