CN201460812U

CN201460812U - Arrow-shaped check valve

Info

Publication number: CN201460812U
Application number: CN2009201278752U
Authority: CN
Inventors: 柯萍; 赖东
Original assignee: CHONGQING WANGJIANG XINQI MACHINERY Co Ltd; Chongqing Wangjiang Industry Co Ltd
Current assignee: CHONGQING WANGJIANG XINQI MACHINERY Co Ltd; Chongqing Wangjiang Industry Co Ltd
Priority date: 2009-06-28
Filing date: 2009-06-28
Publication date: 2010-05-12
Anticipated expiration: 2019-06-28

Abstract

The utility model discloses an arrow-shaped check valve which comprises a valve body, a press cap, a sealed box, O-shaped rings, a sealing arrow and a lower seat arranged in a stepped hole at the lower part of the valve body. The arrow-shaped check valve is characterized in that the sealing arrow with a conical surface outside the middle part is arranged on the lower seat and the lower end of the sealing arrow is inserted into the lower seat; the sealed box with a conical surface inside the lower part is matched with the inner wall of the middle part of the valve body; two O-shaped rings are arranged between the sealed box and the inner wall of the middle part of the valve body; the press cap is in thread fit with the inner wall of the middle-upper part of the valve body and the lower end of the press cap is tightly attached on the upper end of the sealed box; the upper end of the sealing arrow passes through the press cap; and the conical surface outside the middle part of the sealing arrow corresponds to/ contacts with the conical surface in the lower part of the sealing box. The arrow-shaped check valve has high strength, high temperature resistance, high pressure resistance, drilling fluid erosion resistance, good overall performance, good sealing performance, long service life, simple structure and convenient maintenance, and can prevent the eruption of high-pressure oil and gas, reduce environmental pollution and prevent flooding and blowout.

Description

A kind of flechette-type flap valve

Technical field

The utility model relates to control valve, concrete a kind of flechette-type flap valve.

Background technology

The flechette-type flap valve is widely used in oil, the gas well operation, is in oil, the natural gas drilling process, one of drill string blowout preventer.Its effect is when overflow occurring or blowout pressure being arranged in drilling process, and flap valve is connected in the drill string, and flap valve shutoff hydrophthalmia automatically under up drilling liquid pressure effect allows drilling fluid to flow from top to bottom, but do not allow drilling fluid upwards to flow.At present, flap valve oily, that gas well is commonly used has ball check valve, butterfly shaped check valve, drop-in check valve, drilling tool float valve etc.Its shortcoming be short, fragile in the time of down-hole hot environment work, erosion resistance and burn into overall performance are not poor, and structure more complicated, processing and operation easier are big, easily cause uncontrollable well head and blowout out of control.Cause the significant wastage of petroleum resources, even the serious consequence of the people that works the mischief, machine.Therefore, be badly in need of a kind of simple and reliable flap valve and solve these problems.

Summary of the invention

The purpose of this utility model provides a kind of flechette-type flap valve, it is connected in the drill string, when borehole pressure is excessive, will promote to seal arrow up with the seal box tapering shutoff hydrophthalmia of fitting automatically, by the shutoff hydrophthalmia, can prevent the ejection of hydraulic oil, gas, can prevent well kick and blowout, reduce environment pollution.

A kind of flechette-type flap valve described in the utility model comprises valve body, pressure cap, seal box, " O " type circle, seals arrow and is located in the valve body lower portion shoulder hole following, it is characterized in that:

Outside one middle part for the sealing arrow of the conical surface is located at down on the seat, in its underpart is inserted following;

The seal box that in one bottom is the conical surface cooperates with the inwall at valve body middle part, is provided with two " O " type circles between the inwall at seal box and valve body middle part; Two " O " types enclose the auxiliary seal effect.Make the utility model when work valve body and seal box between do not occur leaking, its erosion resistance and corrosion resistance are good, can improve the life-span of flechette-type flap valve.

One pressure cap cooperates with the inner thread of valve body middle and upper part, the lower end of this pressure cap be close to the upper end of seal box;

Pressure cap is passed on the top of sealing arrow, and the outer conical surface in its middle part is corresponding with the conical surface in the seal box bottom/contacts.

Operating principle of the present utility model is as follows: as shown in Figure 2, when borehole pressure is excessive, highly pressurised liquid or gas are by the hole on following 6 walls, act on the pressure-bearing surface of sealing arrow 5, make sealing arrow 5 up automatically and make the conical surface applying of its conical surface and seal box 3, and seal box is pushed down by pressure cap, plays plugging action.Thereby control overflow or blowout prevent the ejection of hydraulic oil, gas.

The beneficial effects of the utility model: have intensity height, high temperature resistant, high pressure resistant, anti-drilling fluid erosion, overall performance is very good; Seal box and sealing arrow tapering hardness height, shutoff is reliable, good seal performance, its long service life; All adopt the awl button with other drilling tool connecting thread, connect reliably easy accessibility; It is simple in structure, and low price is easy to use, is convenient to maintenance; Because borehole pressure may surpass drilling liquid pressure, drilling fluid is pushed along the upwards ejection of drill string hydrophthalmia, uses the flechette-type flap valve can play the protection hose and is not suppressed bad by high pressure; Prevent the ejection of hydraulic oil, gas, can also reduce environment pollution simultaneously, prevent the effect of overflow, blowout.

Description of drawings

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

Structural representation when Fig. 2 is the utility model duty;

The specific embodiment

Referring to Fig. 1 and Fig. 2, a kind of flechette-type flap valve described in the utility model, comprise valve body 1, pressure cap 2, seal box 3, " O " type circle 4, sealing arrow 5 and be located in the valve body lower portion shoulder hole following 6, it is characterized in that: outside the middle part for the sealing arrow 5 of the conical surface is located at down on the seat 6, in its underpart is inserted following; The seal box 3 that in one bottom is the conical surface cooperates with the inwall at valve body 1 middle part, is provided with two " O " type circles 4 between the inwall at seal box and valve body middle part; One pressure cap 2 cooperates with the inner thread of valve body 1 middle and upper part, the lower end of this pressure cap be close to the upper end of seal box 3; Pressure cap 2 is passed on the top of sealing arrow 5, and the outer conical surface in its middle part is corresponding with the conical surface in the seal box bottom/contacts.

Be connected with fine thread between pressure cap 2 and the valve body 1, and seal box 3 is pressed in the valve body 1, be combined with 2 round section joint rings 4 between seal box 3 and the valve body 1 and play the auxiliary seal effect.Seal box 3 has one to grind the conical surface, its hardness height, and abrasion resistance is good; On sealing arrow 5 following 6 in valve body, sealing arrow 5 also has a grinding conical surface, and its hardness is also high, abrasion resistance might as well, the tapering of conical surface tapering and the seal box 3 of sealing arrow 5 is the same, and is to match grinding with the conical surface of seal box 3, can guarantee the sealing of its applying.All there is enough big hole to come on the sidewall of following seat 6 and the upper end wall by liquid or gas.

During use, the utility model is connected in the drill string, when borehole pressure is not higher than drilling liquid pressure, the sealing arrow leans against down on the seat, the unblocked drilling fluid of well internal channel can flow from the top down, and when borehole pressure was higher than drilling liquid pressure, the sealing arrow under high pressure can be gone up automatically and exercise its conical surface and the applying of the seal box conical surface, and seal box is pushed down by pressure cap, plays plugging action.

Claims

1. a flechette-type flap valve comprises valve body (1), pressure cap (2), seal box (3), " O " type circle (4), sealing arrow (5) and is located at valve body lower portion shoulder hole interior following (6), it is characterized in that:

Outside one middle part for the sealing arrow (5) of the conical surface is located at down on the seat (6), in its underpart is inserted following;

The seal box (3) that in one bottom is the conical surface cooperates with the inwall at valve body (1) middle part, is provided with two " O " type circles (4) between the inwall at seal box and valve body middle part;

One pressure cap (2) cooperates with the inner thread of valve body (1) middle and upper part, the lower end of this pressure cap be close to the upper end of seal box (3);

Pressure cap (2) is passed on the top of sealing arrow (5), and the outer conical surface in its middle part is corresponding with the conical surface in the seal box bottom/contacts.