CN208687035U - The check valve of sand prevention - Google Patents

Abstract

The utility model discloses a kind of check valves of sand prevention, comprising: mounting base, the valve pocket for being fixed on the mounting base, the spool inside the valve pocket, the pedestal for being connected to the valve pocket one end, the spring for being connected to spool and the spool being driven to slide；The inner wall of the valve pocket is cylindrical surface, and the outer wall of spool is non-cylindrical, has between the valve pocket and spool and is bonded gap, which is the channel for being parallel to spool axial direction.The outer wall of the spool includes several cambered surfaces and the face that connect with cambered surface.Those cambered surfaces are uniformly distributed along the circumferential direction of the outer wall of the spool.The face connecting with cambered surface is plane.Sealing ring is equipped between the valve pocket and pedestal and between the valve pocket and mounting base.The utility model can in the well liquid containing silt long-term normal use.

Description

The check valve of sand prevention

Technical field

The utility model relates to production of hydrocarbons well logging field more particularly to a kind of check valves of sand prevention.

Background technique

The flow direction control to mixed liquor is realized using check valve in production of hydrocarbons well logging field, the runner of downhole instrument System.Existing check valve largely suitable for pure hydraulic oil environment, fraction be it is exposed outside, can directly be connect with well liquid The check valve of touching, but requirement of this check valve directly contacted with well liquid to external environment is more harsh；It can not contain Compared with working normally for a long time in the well fluid environment of high concentration of sediment, the silt blocking easily contained by well liquid is stuck, so as to cause check valve Service life is shorter, high frequency of replacement.

Summary of the invention

In view of the deficiencies of the prior art, the utility model provides a kind of check valve of sand prevention.

The check valve of the sand prevention of the utility model including mounting base, the valve pocket that is fixed on the mounting base, is located in the valve pocket The spool in portion, the pedestal for being connected to the valve pocket one end, the spring for being connected to spool and the spool being driven to slide；The valve pocket Inner wall is cylindrical surface, and the outer wall of spool is non-cylindrical, has between the valve pocket and spool and is bonded gap, which is It is parallel to the channel of spool axial direction.

The outer wall of the spool includes several cambered surfaces and the face that connect with cambered surface.

Those cambered surfaces are uniformly distributed along the circumferential direction of the outer wall of the spool.

The face connecting with cambered surface is plane.

The outer wall of the spool includes 6 planes.

Sealing ring is equipped between the valve pocket and pedestal and between the valve pocket and mounting base.

One end of the spring is connect with the spool；The other end supports the pedestal.

The tail portion of the spool is equipped with spring compressor, and one end of the spring is connected with the spring compressor, and the other end is supported described Valve pocket.

The sealing surface of the valve pocket and spool is conical surface type or right-angle surface formula.

Have between being bonded when being bonded due to the outer wall of spool of the utility model with the inner wall of valve pocket, between spool and valve pocket Gap is formed in parallel with the channel of spool axial direction between the valve pocket and spool, the fluid containing fine sand passes through valve via the channel Set；Fine sand is discharged, and will be reduced the chance of its binding face for being trapped in valve pocket and spool and sealing surface accumulation, be avoided its shadow It rings spool slidingly and sealingly, to extend the service life of check valve, can normally make for a long time in the well liquid containing silt With.

Detailed description of the invention

Fig. 1 is the cross-sectional view of the first embodiment of the check valve of the sand control of the utility model.

Fig. 2 is the A-A sectional view of Fig. 1.

Fig. 3 is the cross-sectional view of the second embodiment of the check valve of the sand control of the utility model.

Fig. 4 is the A-A sectional view of Fig. 3.

1- spool 2- pedestal 3,7- runner 4- spring 5- valve pocket 6- mounting base 8- sealing ring 9- spring compressor 10- are bonded gap.

Specific embodiment

The utility model is described in further detail now in conjunction with drawings and examples.

Referring to FIG. 1 to FIG. 2, it is the first embodiment of the utility model, is provided at the check valve of flow passage entry；Including It is fixed on the valve pocket 5 in mounting base 6 and the spool inside the valve pocket 1；5 tail portion of valve pocket is connected to pedestal 2, thus by spool It is encapsulated in inside valve pocket 5；It is equipped with sealing ring 8 between the valve pocket 5 and pedestal 2 and between the valve pocket 5 and mounting base 6, because And fluid will not be flowed out via their fit-up gap.Because the gap between spool 1 and valve pocket 5 that dimensional tolerance guarantees is matched Close, the side wall of spool 1 can opposing valve sleeves 5 slide back and forth, when 1 opposing valve sleeves forward slip of spool, until spool and valve pocket are preceding End contacts to form sealing surface.Spring 4 is equipped between spool and pedestal, tension force of spring makes spool support the front end of valve pocket, from And valve is in normally off.

Mounting base and pedestal respectively connected runner 7,3, and inlet valve can be fixed on downhole instrument by mounting base.When When being positive at mounting base with the pressure difference of the fluid of base position, and overcoming the tension of spring 4, spool is sliding to the tail end of valve pocket Dynamic, sealing surface is opened, and valve opening, fluid flows to pedestal from mounting base；Conversely, valve is kept closed.

Fig. 2 is the cross section of valve pocket and spool；It can be seen that from figure, the outer wall of spool only can be bonded valve pocket there are six orientation Inner wall, adjacent can have fitting gap 10 between binding face.Although check valve front end is equipped with filter, the liquid filtered In also make that fine sand can be contained, fail to filter complete fine sand via fitting gap 10 and pass through valve pocket with fluid；Due to being originally practical It is novel this part fine sand to be released, its chance for being trapped in aforementioned binding face and sealing surface accumulation will be reduced, it is avoided Influence spool slidingly and sealingly, thus extend the service life of inlet one-way valve, it can be long-term in the well liquid containing silt Normal use.

It is the second embodiment of the utility model, the check valve being provided at runner exit referring to Fig. 3~Fig. 4；Including Be fixed on the valve pocket 5 in mounting base 6 and the spool inside the valve pocket 1, valve pocket tail portion is connected to pedestal 2, the valve pocket with Sealing ring 8 is equipped between pedestal and between the valve pocket and mounting base, the tail portion of spool is fixed with spring compressor 9, spring 4 Spring compressor 9 is supported in one end, and the other end is supported with valve pocket, and is located at the front of spring compressor 9；So that spool is sliding to the tail end of valve pocket Dynamic, when spool slides backward, the front end of spool contacts to form sealing surface with valve pocket, and valve is in normally off.

Fig. 4 is the cross section of valve pocket and spool；It is identical with the first embodiment, the outer wall of spool can be only bonded there are six orientation The inner wall of valve pocket, adjacent can have fitting gap 10 between binding face.Fine sand passes through valve pocket with liquid via fitting gap 10； This part, sand is released, and will reduce its chance for being trapped in binding face and sealing surface accumulation, avoiding it influences the cunning of spool Dynamic and sealing, thus extend the service life of Outlet check valves, it can long-term normal use in the well liquid containing silt.

Preferably, the sealing surface is conical surface type or right-angle surface formula；And the two is hard sealing material or soft seal material The collocation of material.

Preferably, the spring is replaceable, its material and specification can be replaced according to the use of occasion, to adjust The cracking pressure value of spool.

It should be noted that the outer wall of the spool of the utility model is non-cylindrical surface, including several cambered surfaces and connection arc The face in the face in face, the connection cambered surface can be plane, be also possible to the curved surface of concave surface or other shapes, shape is not limited to In the shape of Fig. 2 or Fig. 4.Preferably, the face of the connection cambered surface is 6 planes for being distributed in spool outer wall circumferential direction.

The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, though So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession Member, in the range of not departing from technical solution of the present invention, when the technology contents using the disclosure above make a little change or repair Decorations are the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, technology according to the present invention are real Matter any simple modification, equivalent change and modification to the above embodiments, still fall within the range of technical solution of the present invention It is interior.

Claims (10)

1. a kind of check valve of sand prevention, it is characterised in that: including mounting base, the valve pocket that is fixed on the mounting base, be located at the valve pocket The spool of inside, the pedestal for being connected to the valve pocket one end, the spring for being connected to spool and the spool being driven to slide；

The inner wall of the valve pocket is cylindrical surface, and the outer wall of spool is non-cylindrical, is had between being bonded between the valve pocket and spool Gap, the fitting gap are the channel for being parallel to spool axial direction.

2. the check valve of sand prevention as described in claim 1, it is characterised in that: the outer wall of the spool include several cambered surfaces and The face being connect with cambered surface.

3. the check valve of sand prevention as claimed in claim 2, it is characterised in that: outer wall of several the described cambered surfaces along the spool Circumferential direction it is uniformly distributed.

4. the check valve of sand prevention as claimed in claim 3, it is characterised in that: the face connecting with cambered surface is plane.

5. the check valve of sand prevention as claimed in claim 4, it is characterised in that: the outer wall of the spool includes 6 planes.

6. the check valve of sand prevention as described in claim 1, it is characterised in that: between the valve pocket and pedestal and the valve pocket with Sealing ring is equipped between mounting base.

7. the check valve of sand prevention as described in claim 1, it is characterised in that: one end of the spring is connect with the spool； The other end supports the pedestal.

8. the check valve of sand prevention as described in claim 1, it is characterised in that: the tail portion of the spool is equipped with spring compressor, described One end of spring is connected with the spring compressor, and the other end supports the valve pocket.

9. the check valve of sand prevention as described in claim 1, it is characterised in that: the sealing surface of the valve pocket and spool is the conical surface Formula.

10. the check valve of sand prevention as described in claim 1, it is characterised in that: the sealing surface of the valve pocket and spool is right angle Face formula.