CN209688188U - A kind of low starting pressure high-precision back-pressure valve - Google Patents
A kind of low starting pressure high-precision back-pressure valve Download PDFInfo
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- CN209688188U CN209688188U CN201920470018.6U CN201920470018U CN209688188U CN 209688188 U CN209688188 U CN 209688188U CN 201920470018 U CN201920470018 U CN 201920470018U CN 209688188 U CN209688188 U CN 209688188U
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Abstract
The utility model discloses a kind of low starting pressure high-precision back-pressure valve, specifically include that cylinder body, top cover, upper cover, float, tail are stifled；Wherein, back pressure air source inlet provides back pressure, system outlet is connect with system pressure entrance, when system pressure is higher than back pressure pressure, float drives needle to move up, system fluid is exported from production fluid to flow out, when system pressure is lower than back pressure pressure, float and needle downlink, the space between float lower part and cylinder body are system fluid, and the stifled gasket that squeezes of tail is used for back pressure needle sealed bottom, needle contacts sealing with gasket, float drives needle to move up, then needle is separated with gasket, and system fluid can be from the stifled outflow of tail；The utility model makes that overall structure becomes simple, stability is good, precision is high by adjusting return-pressure structure.
Description
Technical field
The utility model relates to a kind of petroleum drilling and mining technical field of tools, more particularly to a kind of low starting pressure
High-precision back-pressure valve.
Background technique
In each task of oil exploration and oil field development, drilling well is played a very important role, but in drilling
In engineering, phenomena such as being frequently encountered well kick, blowout.When strata pressure is more than mud liquid column hydrostatic pressure, strata pressure very may be used
Mud can be pushed to spray upwards along drill string hydrophthalmia, rotary hose may be sprained bad because of high pressure, and be likely occurred serious well
Spray accident needs a large amount of mud to be pressurized at this time, so that rig floor becomes in disorder, and the oil of underground sprays, and causes ring
The pollution in border；In oilfield exploitation procedure, all it is to carry out oil extraction under strata pressure, thus needs under strata pressure
Experiment, simulation stratum condition analyzes different samples, and the main purpose of back-pressure valve is exactly to pass through setting back pressure, make be
System internal pressure meets pressure under the conditions of stratum.Back-pressure valve currently on the market, it is main as back pressure control usually using diaphragm
Unit, system pressure are higher than back pressure, then diaphragm lifts, and system fluid is flowed out from diaphragm bottom, traditional check-valves disassembly and more
Change that vulnerable part is inconvenient, starting pressure is high, stability is poor, control accuracy difference.
Therefore how a kind of low starting pressure high-precision back-pressure valve is provided, not only can be improved control precision, but also can be with
It simply changes, there is the problem of reliably stability is those skilled in the art's urgent need to resolve.
Utility model content
In view of this, the present invention provides a kind of spy high, easy to operate with precision, with reliably stability
The low starting pressure high-precision back-pressure valve of one kind of point.
To achieve the above object, the utility model provides the following technical solutions:
A kind of low starting pressure high-precision back-pressure valve characterized by comprising cylinder body changes cylinder interior and is equipped with float
And top cover, upper cover is between top cover and float；One end of the upper cover is by pin assembly on top cover, and the other end passes through
Key is fixed in inner chamber of cylinder block；The upper cover, buoy upper, cylinder body form a confined space, are designed on upper cover and float
Sealing ring seals；The cylinder base center makes tail is stifled to be fixed in cylinder base by a fixed ring；The cylinder body side
Face is equipped with system pressure entrance, and tail is blocked to be exported equipped with production fluid, and top cover top is equipped with back pressure air source inlet；Under the float
Face is connect in the conical surface and center with needle；When system pressure is higher than back pressure pressure, float drives needle to move up, slight to lift
After rising, system fluid is exported from production fluid to flow out；When system pressure is lower than back pressure pressure, float and needle downlink, needle are closed
It closes；Space between float lower part and cylinder body is system fluid, and the stifled gasket that squeezes of tail is used for back pressure needle sealed bottom, needle
Sealing is contacted with gasket, float drives needle to move up, then needle is separated with gasket, and system fluid can be from the stifled outflow of tail.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, the upper cover both ends are equipped with pin hole, one end
It is fixed on top cover by pin, the other end is fixed on cylinder interior by keyway.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, the top cap central is offered towards float
Access opening, and be connected through a screw thread and be fixed on cylinder body on the outside of top cover, play a part of to fix and seal back pressure up for safekeeping.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, the float bottom surface is designed in the conical surface, works as valve
When needle and gasket seal seal failure, the conical surface can seal below float, guarantee that system pressure is not revealed.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, annular is equipped on the upper cover and float
Seal groove, and O-ring is equipped in seal groove.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, the float diameter is not less than top cover inner hole
Diameter.
Preferably, in the low starting pressure high-precision back-pressure valve of above-mentioned one kind, the top cover, upper cover, float, cylinder body, tail
Block up the coaxial heart.
The low starting pressure high-precision back-pressure valve of one of the utility model, changes existing back-pressure valve disassembly and replacement is easy
Damage part is inconvenient, starting pressure is high, stability is poor, control accuracy difference defect, entire using making by the adjustment in structure
The disassembling operations of back-pressure valve are very simple；By adjusting the forced area of back-pressure valve float, increases back-pressure valve forced area, open
Pressure is opened to become smaller；Connecting needle by float lower end makes back-pressure valve, i.e. releasable excessively high system pressure after lifting float slightly
Power, while tiny needle can perfectly control the burst size of single, maintain system pressure to stablize, be not in that float is frequent
Open and close phenomenon；Apply back pressure by gas, keeps the fluctuation of float floating bring back pressure minimum, mention high control precision.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 attached drawing is the system schematic of the low starting pressure high-precision back-pressure valve of the utility model.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model 1, to the technical scheme in the embodiment of the utility model into
Row clearly and completely describes, it is clear that and the described embodiments are only a part of the embodiments of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is low that the utility model embodiment discloses a kind of one kind for having the characteristics that precision is high, stability is good, easy to operate
Start pressure high-precision back-pressure valve.
Attached drawing 1 is please referred to, is the novel low starting pressure high-precision back-pressure valve of one kind disclosed in utility model, specifically includes:
Cylinder body -1, top cover -2, float -3, tail block up -4, fixed ring -5, upper cover -6, needle -7, gasket -8, back pressure gas source
Entrance -9, system pressure entrance -10, production fluid export -11, pin -12, key -13, O-ring -14；
Specifically include that cylinder body 1, changing 1 mounted inside of cylinder body has a float 3 and top cover 2, upper cover 6 be located at top cover 2 and float 3 it
Between；One end of the upper cover 6 passes through on the assembly of pin 12 and top cover 2, and the other end is fixed in 1 inner cavity of cylinder body by key 13；
The upper cover 6,3 top of float, cylinder body 1 form a confined space, and sealing is designed in upper cover 6 and float 3 and encloses sealing work
With；1 bottom centre of cylinder body is equipped with stifled 41 sides of cylinder body of a tail by fixed ring 5 and is equipped with system pressure entrance 10,
Tail stifled 4 is equipped with production fluid outlet 11, and 2 top of top cover is equipped with back pressure air source inlet；The float 3 is in the conical surface and center below
It is connect with needle 7；When system pressure is higher than back pressure pressure, float 3 drives needle 7 to move up, after slightly lifting, system stream
Body is flowed out from production fluid outlet 11；When system pressure is lower than back pressure pressure, float 3 and needle downlink, needle are closed；Float 3
Space between lower part and cylinder body 1 is system fluid, and tail stifled 4 squeezes gaskets 8 and is used for back pressure needle sealed bottom, needle 7 with
The contact sealing of gasket 8, float 3 drive needle 7 to move up, then needle is separated with gasket 8, and system fluid can block up 4 streams from tail
Out.
The utility model improves traditional return-pressure structure, and the low starting pressure high-precision back-pressure valve of novel one kind is made to have essence
The feature that degree is high, stability is good, easy to operate；
In order to further optimize the above technical scheme, by adjusting the forced area of back-pressure valve float 3, make back-pressure valve stress
Area increases, and cracking pressure becomes smaller.
In order to further optimize the above technical scheme, connecting needle 7 by 3 lower end of float makes back-pressure valve, keeps float 3 slight
I.e. releasable excessively high system pressure after lifting, while tiny needle 7 can perfectly control the burst size of single, maintain system
Pressure of uniting is stablized, and is not in the frequent open and close phenomenon of float 3.
In order to further optimize the above technical scheme, back pressure is applied by gas, fluctuates 3 floating bring back pressure of float
Minimum mentions high control precision.
In order to further optimize the above technical scheme, back pressure valve arrangement is adjusted, keeps entire back-pressure valve simply easy to assemble, easily
Vulnerable part is replaced, while by gas add-back pressure, back pressure fluctuation can be reduced to the full extent.
In order to further optimize the above technical scheme, there is conical surface seal in 3 bottom surface of float, when needle 7 and the sealing of gasket 8 lose
When effect, the conical surface can seal float 3 below, guarantee that system pressure is not revealed.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (7)
1. a kind of low starting pressure high-precision back-pressure valve characterized by comprising cylinder body (1), cylinder body (1) mounted inside have
Float (3) and top cover (2), upper cover (6) are located between top cover (2) and float (3)；One end of the upper cover (6) passes through pin
(12) in assembly and top cover (2), and the other end is fixed in cylinder body (1) inner cavity by key (13)；The upper cover (6), float (3)
Top, cylinder body (1) form a confined space, are designed with sealing ring in upper cover (6) and float (3) and seal；The cylinder
Body (1) bottom centre is equipped with a tail by fixed ring (5) and blocks up (4)；Cylinder body (1) side is equipped with system pressure entrance, tail
Stifled (4) are equipped with production fluid outlet (11), and top cover (2) top is equipped with back pressure air source inlet (9)；The float (3) is in below
The conical surface and center is connect with needle (7)；When system pressure is higher than back pressure pressure, float (3) drives needle (7) to move up,
After lifting, system fluid is flowed out from production fluid outlet (11)；When system pressure is lower than back pressure pressure, float (3) and needle (7)
Downlink, needle (7) are closed；Space between float (3) lower part and cylinder body (1) is system fluid, and tail blocks up (4) and squeezes gasket
(8) it is used for back pressure needle sealed bottom, needle (7) to contact sealing with gasket (8), and float (3) drives needle (7) to move up, then
Needle (7) is separated with gasket (8), and system fluid can block up (4) from tail and flow out.
2. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that in the cylinder body (1)
Bottom of chamber portion is in conical-surface type, and front end, which is equipped among screw thread, is equipped with keyway, and cylinder body (1) bottom offers the channel that (4) are blocked up towards tail
Hole.
3. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that in the top cover (2)
The heart offers the access opening towards float (3), and is connected through a screw thread and is fixed on cylinder body (1) on the outside of top cover (2), is formed and is fixed
Seal the space of back pressure up for safekeeping.
4. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that float (3) bottom
Face is designed in the conical surface, and when needle (7) and gasket (8) seal failure, the conical surface can guarantee system pressure not to float (3) below
Leakage.
5. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that the upper cover (6) and
Float is equipped with annular seal groove on (3), and O-ring (14) are equipped in seal groove.
6. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that the float (3) is straight
Diameter is not less than top cover (2) diameter of bore.
7. the low starting pressure high-precision back-pressure valve of one kind according to claim 1, which is characterized in that the cylinder body (1), top
Cover (2), float (3), tail stifled (4), upper cover (6) coaxial heart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470018.6U CN209688188U (en) | 2019-04-09 | 2019-04-09 | A kind of low starting pressure high-precision back-pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920470018.6U CN209688188U (en) | 2019-04-09 | 2019-04-09 | A kind of low starting pressure high-precision back-pressure valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209688188U true CN209688188U (en) | 2019-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920470018.6U Active CN209688188U (en) | 2019-04-09 | 2019-04-09 | A kind of low starting pressure high-precision back-pressure valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963691A (en) * | 2020-08-18 | 2020-11-20 | 西南石油大学 | Small-size high-temperature high-pressure back-pressure valve with line diaphragm |
-
2019
- 2019-04-09 CN CN201920470018.6U patent/CN209688188U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963691A (en) * | 2020-08-18 | 2020-11-20 | 西南石油大学 | Small-size high-temperature high-pressure back-pressure valve with line diaphragm |
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