CN2856404Y

CN2856404Y - One-way fixed pressure stop valve

Info

Publication number: CN2856404Y
Application number: CN 200620080556
Authority: CN
Inventors: 陈俊; 曹文江; 梁立民
Original assignee: 陈俊
Priority date: 2006-01-20
Filing date: 2006-01-20
Publication date: 2007-01-10
Anticipated expiration: 2016-01-20

Abstract

The utility model relates to a one way stop valve, especially a one way constant pressure stop valve. A core tube 8 is arranged in an inner tube 6 with a spring seat 14, a spring 13 and a working seat 3 arranged from bottom to top; the working seat 3 is fixed to the core tube 8 while sliding fitting with the inner tube 6 which is arranged in an outer tube 4 having a top joint and a bottom joint on the two ends and linked to the inner tube 6 by screwed connection with clearance fitting; an annular cavity is formed between the inner tube 6 and the outer tube 4; two flushing through holes 5, 9 are arranged near the ball seat 3 on the inner tube and on the bottom part of the spring seat 14; two O-shaped sealing rings are arranged between the inner tube and the top joint1 and the ball seat 3; and a breathing hole 7 is formed near the spring of inner tube 6 for preventing air pressure existing in the spring cavity. The utility model has the beneficial effects of preventing liquid from flowing backwards, providing flowing channel for circular flushing and ensuring normal flushing operation.

Description

Unidirectional level pressure stop valve

One, technical field: the utility model relates to and is used for unidirectional stop valve, particularly a kind of unidirectional level pressure stop valve.

Two, background technology: oil field electric motor drive oil pump system, general completion flow string is being installed unidirectional stop valve between the 1-2 root oil pipe above the electric pump, pipe 6, work block 3, ball or seal cones 2 were formed in this stop valve structure comprised, between interior pipe 6 and the work block 3 is to be fixedly connected, liquid can only upwards flow, and is used to prevent under the liquid inverted well.When the obstruction that is subjected to cements such as pitch when electric pump need be cleaned, can't allow liquid flow backwards to be the method for direct flushing to clean electric pump.

Three, summary of the invention: the purpose of this utility model is exactly the above-mentioned defective that exists at prior art, provides a kind of liquid that can prevent to flow backwards, and the unidirectional level pressure stop valve of flow channel can be provided for direct flushing again.

Its technical scheme is: be provided with core pipe 8 in interior pipe 6, spring base 14, spring 13 and work block 3 are housed outside core pipe 8 from bottom to top successively, work block 3 is fixing with core pipe 8, and and interior pipe 6 between be slidingly matched, outside interior pipe 6, also be with outer tube 4, outer tube 4 two ends are provided with

lower contact

1,10, and with interior pipe 6 between be that screwed connection is connected with matched in clearance, form the toroidal cavity of sealing between interior pipe 6 and the outer tube 4, the position near ball seat 3 bottoms and spring base 14 bottoms is respectively equipped with well-flushing through hole 5,9 on inner pipe.Be respectively arranged with O RunddichtringO 11,12 between interior pipe 6 and top connection 1 and the ball seat 3,, be provided with spiracle 7 near the spring places at interior pipe 6 in order to prevent there is air pressure in the spring cavity.

Effect of the present utility model is: during ordinary production, ball or seal cones 2 cooperate with work block 3, realize the effect of single current stop valve.When the needs clean-out service, when flushing fluid pressure reaches the force value of setting greater than the difference of bottom pressure, ball or seal cones 2 and work block 3 move down together, after moving on to well-flushing through hole 5, flushing fluid is toroidal cavity, well-flushing through hole 9, the lower contact 10 by interior pipe 6, well-flushing through hole 5, interior pipe 6 and outer tube 4 successively, inject the oil recovery electric pump, realize clean-out service electric pump and down-hole pipeline.

Four, description of drawings: accompanying drawing is a section of structure of the present utility model.

Five, the specific embodiment:

As shown in drawings, the 1st, top sub, the 2nd, ball or seal cones, the 3rd, work block, the 4th, outer tube, the 5th, last well-flushing through hole 6 is interior pipes, the 7th, spiracle, the 8th, core pipe, the 9th, following well-flushing through hole, the 10th, bottom joint, the 11st, O type sealing, the 12nd, O type sealing, the 13rd, spring, the 14th, spring base.In interior pipe 6, be provided with core pipe 8, on core pipe 8, be with spring base 14 from lower to upper successively, spring 13 and work block 3, be slidingly matched between work block 3 and the interior pipe 6, outside interior pipe 6, be with outer tube 4, outer tube 4 two ends are provided with

lower contact

1,10, and with interior pipe 6 between be that screwed connection is connected with matched in clearance, when implementing circulation well cleanup, when flushing fluid pressure reaches the force value of setting greater than the difference of bottom pressure, spring 13 is to lower compression, and last well-flushing through hole 5 is opened, the closes annular cavity in flushing fluid enters between pipe 6 and the outer tube 4, by pipe 6 in well-flushing through hole 9 flows into down, inject the oil recovery electric pump, realize clean-out service, in order to prevent there is air pressure in the spring cavity to electric pump and down-hole pipeline, be provided with spiracle 7 at interior pipe 6 near the spring places, the air pressure in the spring cavity enters closes annular cavity between outer tube 4 and the interior pipe 6 by spiracle 7.

Claims

1, a kind of unidirectional level pressure stop valve, comprise interior pipe (6), work block (3), ball or seal cones (2), it is characterized in that: in interior pipe (6), be provided with core pipe (8), spring base (14) is housed outside core pipe (8) from bottom to top successively, spring (13) and work block (3), work block (3) is fixing with core pipe (8), and and interior pipe (6) between be slidingly matched, outside interior pipe (6), be with outer tube (4), form the toroidal cavity of sealing, outer tube (4) two ends are respectively equipped with, lower contact (1,10), and be connected with interior pipe (6) upper and lower end parts, the position of going up near work block (3) bottom and spring base (14) bottom at interior pipe (6) is respectively equipped with well-flushing through hole (5,9).

2,, it is characterized in that being respectively arranged with O RunddichtringO (11) and (12) between interior pipe (6) and top connection (1), interior pipe (6) and the work block (3) according to the described unidirectional level pressure stop valve of claim 1.