CN107061817B - A kind of trequency piston type constant pressure valve - Google Patents
A kind of trequency piston type constant pressure valve Download PDFInfo
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- CN107061817B CN107061817B CN201710063345.5A CN201710063345A CN107061817B CN 107061817 B CN107061817 B CN 107061817B CN 201710063345 A CN201710063345 A CN 201710063345A CN 107061817 B CN107061817 B CN 107061817B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
Abstract
The present invention provides a kind of trequency piston type constant pressure valves, including valve body, fluid inlet and fluid outlet are provided on valve body, valve internal guide slidable fit has the first piston with piston rod, piston import and the piston outlet of connection fluid inlet and fluid outlet are offered on first piston, the rod chamber of connection first piston two sides and the communicating pipe of rodless cavity are provided on valve body, the piston rod of first piston stretches out except valve body and is connected with constant force mechanisms, constant force mechanisms include the shell for being fixedly connected on the rod chamber side of valve body, the shell bottom that shell has atmosphere connection port and is connected with valve body, shell internal guide slidable fit has second piston, second piston and piston rod are pushing tow cooperation and are vacuum between second piston and shell bottom.Beneficial effects of the present invention: the present invention does not depend on adjustment spring, and the stability in use of constant pressure valve is improved using constant force mechanisms, and fluid output pressure is accurate, and with the automatic adjustment of first piston in use, fluid output pressure remains stable.
Description
Technical field
The present invention relates to a kind of trequency piston type constant pressure valves.
Background technique
Gas field water-producing gas well wellhead temperature is low, and about 4-7 DEG C of winter, about 14-16 DEG C of summer, pit shaft and pipeline easily form hydration
Object and frozen block and frequent jams occur.In order to prevent the formation of hydrate, being added usually into natural gas can reduce hydrate
The hydrate inhibitor for natural gas of temperature is generated, such as methanol prevents the generation of hydrate to reduce the dew point of natural gas.
Note alcohol pipeline and sewage containing methanol processing equipment are needed to configure when using this method, the enforcement difficulty for infusing methanol technics is bigger,
And there are three big drawbacks using methanol: the first, methanol is toxic, and there are certain harm；The second, methanol usage is big, and totle drilling cost is high；The
Three, alcohol and sewage treatment equipment are infused and auxiliary facility investment is big.
Therefore, some gas fields are developed using the cleaner production mode of " downhole choke, low pressure gas collection " at present, downhole choke skill
Art is that flow controller is mounted on to oil pipe appropriate location, occurs that the reducing pressure by regulating flow expansion process of natural gas in well, utilizes simultaneously
Ground temperature heats the air-flow after throttling, and the gas flow temperature after enabling throttling is significantly gone up, and is higher than air-flow after throttling
Hydrate under pressure condition generates temperature, to achieve the purpose that prevent and treat hydrate generates in pit shaft and surface line.Underground
Throttling technology can reduce pit shaft and surface line pressure, and solution blocking-proof result is significant, compared with high-pressure gas collection mode, the development mode
Individual well note alcohol pipeline investment and daily note alcohol fee of material can be saved, while because ground gas gathering line stress levels reduce, therefore can be big
Width reduces ground gas gathering line wall thickness and steel consumption, saves oil and builds expense, greatly reduces ground surface works investment, effectively improves
The development benefit in gas field.
But for the gas field relatively high for some water yields, such as up to 72.5 sides/day, gas well are taken itself
Liquid scarce capacity, there are biggish drain problems；Throttling technology is used in this kind of high yield liquid gas well under conventional well simultaneously, due to oil
It is easy to cause pit shaft obstructed after installation flow controller in pipe, is unfavorable for the production of high yield liquid Gas Well Liquid Continuous Withdrawal, easily causes high yield
Liquid gas well plug-ging, water logging stop production, and seriously limit the performance of gas field production capacity.
In order to guarantee high yield liquid liquids continuous removal steady production, and it must satisfy the defeated development mode of gas field low pressure collection again
It is required that therefore under the conditions of underground throttle device is not installed, a pressure reducing valve can be generally installed at well head, to realize high yield liquid gas
The production of well reducing pressure by regulating flow, is on the one hand effectively reduced surface line pressure, reduces security risk, investment reduction；On the other hand can have
Effect prevention and treatment hydrate generates, and is conducive to gas well continuous-stable drain production, gas field development benefit can be improved.
Common pressure reducing valve is all the output pressure controlled after decompression by adjustment spring on the market at present, is such as authorized public
Announcement number is CN201715057U, and authorized announcement date is a kind of dummy piston disclosed in the Chinese utility model patent of 2011.01.19
Induction type pneumatic pressure-release valve, the pressure reducing valve need to press by twisting valve deck with compression adjustment spring to set output when in use
Power, at the same twist valve deck, compression adjustment spring can also make dummy piston press spool downwards, to make between spool and valve seat
It is detached from and forms an opening, also open the circulation passage of fluid at last in this way, enable a fluid to from air inlet into and from gas outlet
Out.When the pressure of fluid be less than preset pressure when, opening will not change, when the pressure of fluid be greater than preset pressure when, piston by
The upward feedback pressure arrived be greater than spring preset pressure, piston moves up at this time, spool under action of reset spring also to
Upper movement, opening become smaller, and opening no longer changes after reducing to a certain extent, and system reaches a balance, the outlet pressure of pressure reducing valve
Power settles out.It loops back and forth like this, the outlet pressure of pressure reducing valve is held essentially constant, and is stable in a certain range.
Though this traditional pressure reducing valve can play depressurization, true in the component structurals size such as valve body, spool
In the case where fixed, output pressure depends entirely on the preset state of adjustment spring, also needs manually to adjust it using preceding
Section, and the output pressure adjusted is how many, just leans on the experience of operator entirely, or can only be ability after measuring output pressure
It understand that, if improper, it is also necessary to which further adjustment adjusts, using very inconvenient.In addition, the compression of adjustment spring
Amount is constantly changing with the fluctuation of fluid input pressure, and with the extension of use time, adjustment spring is in compression many times
After return action, elastic force can be declined, and especially adjustment spring makes in corrosion and scaling or after being blocked by impurity
It can be had a greatly reduced quality with performance, will seriously affect the decompression and using effect of pressure reducing valve, therefore the service life of this pressure reducing valve
It is bad with stability.
Summary of the invention
The purpose of the present invention is to provide it is a kind of independent of adjustment spring, stability in use is relatively high and fluid
The precise and stable trequency piston type constant pressure valve of output pressure.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme:
A kind of trequency piston type constant pressure valve, including valve body are provided with fluid inlet and fluid outlet on valve body, lead in valve body
There is the first piston with piston rod to slidable fit, the connection fluid inlet and fluid outlet are offered on first piston
Piston import and piston outlet are so that the pressure of valve body upper fluid outlet can be adjusted by the movement of first piston, on valve body
It is provided with the rod chamber of connection first piston two sides and the communicating pipe of rodless cavity, the piston rod of first piston stretches out except valve body simultaneously
It is connected with constant force mechanisms.
The constant force mechanisms include the shell for being fixedly connected on the rod chamber side of valve body, and the shell has and big gas phase
The communication port of connection and the shell bottom being connected with valve body, the piston rod of first piston passes through shell bottom and protrudes into shell, in shell
Guiding slidable fit has second piston, and second piston and piston rod are pushing tow cooperation and are vacuum between second piston and shell bottom.
The silk plug that shell bottom releasable connection has convenient for vacuumizing.
The first Stop structure for preventing second piston abjection shell is provided in shell.
The valve body is in open at one end, the closed tubular structure of the other end, and the opening constitutes the fluid outlet of valve body, institute
It states fluid inlet to be provided on the barrel of valve body, the first piston is also in open at one end, the closed tubular structure of the other end, institute
The open piston outlet for constituting first piston is stated, the piston import is provided on the barrel of first piston, tool in first piston
There is the plunger shaft of connection piston import and piston outlet.
Piston import on first piston is equal with the fluid inlet internal diameter on valve body.
The second Stop structure for preventing first piston abjection valve body is provided in valve body.
The beneficial effects of the present invention are: due to offering connection valve body upper fluid import and fluid outlet on first piston
Piston import and piston outlet be overlapped when piston import with fluid inlet therefore when first piston moves in valve body
When aperture is bigger, the fluid flowed through is relatively more, and the pressure of fluid outlet is bigger at this time, when piston import and fluid inlet weight
When the aperture of conjunction is smaller, the pressure of fluid outlet will become smaller, therefore upper by the adjustable valve body of the movement of first piston
The pressure of body outlet；
Due to be provided on valve body connection first piston two sides rod chamber and rodless cavity communicating pipe, rod chamber and
The fluid pressure of rodless cavity is equal, but by the Fluid pressure of rod chamber and rodless cavity be on first piston it is unequal,
Because rod chamber has had more a piston rod, the cross-sectional area of stress is less than the forced area of rodless cavity, therefore first piston
Suffered resultant force is directed towards rod chamber side, and this is equal to fluid pressure multiplied by the cross-sectional area of piston rod with joint efforts,
That is the trend of first piston always oriented rod chamber side movement；
It, can by the constant force mechanisms since the piston rod of first piston stretches out except valve body and be connected with constant force mechanisms
To apply a constant force opposite with the resultant direction to piston rod, when constant force value, which is equal to resultant force, to be worth, first piston is just protected
Maintain an equal level weighing apparatus, and the aperture that piston import at this time is overlapped with fluid inlet remains unchanged, and constant pressure valve will export constant-pressure fluid, the constant pressure value
Set constant force value is equal to divided by the cross-sectional area of piston rod, therefore in setting, it can be according to known piston rod
Cross-sectional area sets a constant force value, then the constant pressure value that constant pressure valve is exported can be realised that；
In use, if the fluid pressure into valve body changes, since the constant force value of constant force mechanisms does not change,
The equilibrium state of first piston will be broken, and when fluid pressure becomes larger, first piston will be mobile from trend rod chamber side,
At the same time, the aperture that piston import is overlapped with fluid inlet will become smaller, and the fluid pressure into valve body will become smaller automatically, until
First piston reaches balance again, and the fluid pressure that constant pressure valve is exported at this time is still the constant pressure value；On the contrary, working as fluid pressure
When becoming smaller by force, first piston will be mobile from trend rodless cavity side, at the same time, the aperture that piston import is overlapped with fluid inlet
It will become larger, the fluid pressure into valve body will become larger automatically, and until first piston reaches balance again, constant pressure valve is exported at this time
Fluid pressure be still the constant pressure value, that is to say, that first piston can automatically by itself move adapt to enter valve
The variation of the fluid pressure of body, so that constant pressure valve be made to export a determining constant pressure value always.
Therefore, trequency piston type constant pressure valve of the invention is independent of adjustment spring, but uses a constant force mechanisms, from
And evaded adjustment spring service performance can changed risk, improve making for trequency piston type constant pressure valve of the invention
With stability, while the fluid output pressure of trequency piston type constant pressure valve is more accurate, when setting the constant force value of constant force mechanisms
It is i.e. knowable, and with the automatic adjustment of first piston in use, fluid output pressure remains stable, and using effect is aobvious
It writes.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of trequency piston type constant pressure valve in the present invention.
In figure: 1. first sealing rings；2. silk plug；3. the second sealing ring；4. third sealing ring；5. air inlet pipe；6. the 4th is close
Seal；7. dummy piston；8. the first stop collar；9. valve body；10. communicating pipe；11. the 5th sealing ring；12. the 6th sealing ring；13.
Vacuum cock；14. shell；15. the second stop collar；16. piston rod；17. the first air inlet；18. the second air inlet.
Specific embodiment
The embodiment of trequency piston type constant pressure valve is as shown in Figure 1, include the constant force mechanisms and balance constant pressure machine of left and right arrangement
Structure, wherein balance constant pressure mechanism includes valve body 9, air inlet pipe 5, dummy piston 7, piston rod 16, communicating pipe 10, the first stop collar 8
And each sealing ring, constant force mechanisms include shell 14, vacuum cock 13, silk plug 2, the second fibrous ring 15 and each sealing ring.
The axis of valve body 9 extends in left-right direction, and valve body 9 is in left end closing, the tubular structure of right-end openings, on valve body 9
Be provided with the fluid inlet and fluid outlet flowed in and out for fluid, wherein fluid outlet by right end on valve body 9 opening structure
At the right end of valve body 9 can directly connect Low-pressure Gas Pipeline.Fluid inlet is the first air inlet being provided on the barrel of valve body 9
17, the axis of the first air inlet 17 is also welded with and the first air inlet perpendicular to the axis of valve body 9 on the outer wall of valve body 9
The coaxial air inlet pipe 5 of mouth 17, the other end of air inlet pipe 5 can directly be connect with high pressure line.
Guiding, which is slidingly sealed, in the inner cavity of valve body 9 is equipped with the first piston with piston rod 16, which is flat
Weigh piston 7, dummy piston 7 also in left end closing, the tubular structure of right end opening, offer on dummy piston 7 be connected to first into
The piston import of port 17 and fluid outlet and piston outlet, wherein piston outlet is made of the opening of 7 right end of dummy piston, living
Filling in mouth is the second air inlet 18 being provided on the barrel of dummy piston 7, has the second air inlet 18 of connection in dummy piston 7
With the plunger shaft of piston outlet.
Second air inlet 18 with the first air inlet 17 on valve body 9 for being overlapped relatively, to form opening for a certain size
Degree, so that fluid flows into valve body 9, the internal diameter of the first air inlet 17 and the second air inlet 18 is equal.In order to guarantee sealing performance,
Third sealing ring 4 and the 4th sealing ring 6, third sealing ring 4 are respectively arranged between the inner wall of valve body 9 on dummy piston 7
The left and right sides of the second air inlet 18 is located at the 4th sealing ring 6.
The left and right sides on the lower section barrel of valve body 9 positioned at dummy piston 7 offers communication port respectively, two communication ports it
Between be welded with communicating pipe 10, the caliber of communicating pipe 10 and the internal diameter of communication port are equal, and it is left that communicating pipe 10 is connected to dummy piston 7
The rod chamber and rodless cavity of right two sides, so that the pressure of rod chamber and rodless cavity is consistent.Therefore, when fluid through air inlet pipe 5,
After first air inlet 17, the second air inlet 18 enter in plunger shaft, a part of fluid meeting exits valve body 9 flows to the low pressure in downstream
In gas pipeline, another part reaches the rod chamber on the left of dummy piston 9 by communicating pipe 10, makes 9 left and right sides of dummy piston
The fluid pressure of cavity keeps equal.
Piston rod 16 on dummy piston 7 is long, extends to the left side closed end for being pierced by valve body 9, piston rod 16
It is slidingly sealed cooperation for guiding between valve body 9, therefore is being provided with the second sealing in the inner hole of valve body 9 between piston rod 16
Circle 3.
The left end of the rod chamber side of valve body 9 is in ladder shaft-like, and path section is thread segment, the shell 14 of constant force mechanisms
Right end is equipped with threaded hole, and shell 14 is threadably secured with valve body 9 and connect.The left end of shell 14 has the company being connected with atmosphere
Open up mouth, right end be a shell bottom, after which that is to say that the bottom end of the threaded hole, shell 14 are threadedly coupled with valve body 9, the shell
Bottom is in contact with the left end face of valve body 9.Piston rod 16 extends after valve body 9 again through the shell bottom and extends to shell 14
In inner cavity, be slidingly sealed cooperation between piston rod 16 and shell bottom for guiding, thus in the inner hole at shell bottom between piston rod 16
It is provided with the 5th sealing ring 11.
Guiding, which is slidingly sealed, in the inner cavity of shell 14 is equipped with second piston, which is vacuum cock 13, vacuum
Piston is not meant to that this piston is vacuum, but the space between vacuum cock 13 and the shell bottom is vacuum, is
Facilitate vacuum pumping, releasable connection has a silk plug 2 on the shell bottom of shell 14, when removing silk plug 2, so that it may convenient
Vacuum pumping makes the part pressure so as to lay down or drain the gas pressure intensity between vacuum cock 13 and shell bottom
Zero, after loading onto silk plug 2, so that it may keep vacuum state, therefore silk plug 2 is equivalent to the effect of relief valve.It is good in order to guarantee
Sealing effect, the first sealing ring 1 is provided between silk plug 2 and shell bottom inner hole, in the inner wall of vacuum cock 13 and shell 14
Between be provided with the 6th sealing ring 12.
Cooperate between vacuum cock 13 and piston rod 16 for pushing tow, cooperates for convenience, it is living in the direction of vacuum cock 13
The pushing tow hole for being installed with 16 end of piston rod is offered on the end face of stopper rod 16.
The second Stop structure of the moving limit to move right for limiting balance piston 7 is provided in valve body 9, this second
Stop structure can prevent dummy piston 7 from deviating from valve body 9, and in this embodiment, second Stop structure is to be threaded in
The first stop collar 8 on 9 inner wall of valve body, and when the second air inlet 18 on the first air inlet 17 and dummy piston 7 on valve body 9
Completely to it is corresponding when, that is, air inlet aperture maximum when, the distance between dummy piston 7 and the first stop collar 8 are very small, put down at this time
The distance that weighing apparatus piston 7 can move right is very limited.Certainly in other embodiments, when air inlet aperture maximum, balance
Also enough distances be can have between piston 7 and the first stop collar 8 or the second Stop structure is arranged in 9 inner wall of valve body
On spacer pin, at this time when air inlet aperture maximum, dummy piston 7 and the spacer pin can directly block cooperate, and balance is lived
Plug 7 can not move right.
The first Stop structure for limiting the moving limit that vacuum cock 13 is moved to the left is provided in shell 14, this
One Stop structure can prevent vacuum cock 13 from deviating from shell 14, and in this embodiment, first Stop structure is screw thread company
The second stop collar 15 in 14 inner cavity of shell is connect, the centre bore on the second stop collar 15 constitutes the intercommunicating pore being communicated with the atmosphere,
Certainly in other embodiments, the first Stop structure is also possible to the spacer pin being arranged in 14 inner cavity of shell.
The working principle of trequency piston type constant pressure valve is: the constant pressure valve be for being mounted at the well head of liquid gas well, instead of
The pressure reducing valve of existing adjustment spring formula carries out reducing pressure by regulating flow to the liquid air-flow body of high pressure, and keeps the fluid pressure of output
In the constant pressure valve of a steady state value.In use, air inlet pipe 5 is connect with high pressure line, the right output port and low pressure appendix of valve body 9
Road connection, the original state of constant pressure valve is not i.e. as shown in Figure 1, when being passed through high-pressure fluid, the first air inlet 17 and the second air inlet
Mouth 18 is completely corresponding, and air inlet aperture is maximum at this time, it should be noted that vacuum cock 13 is also substantially at shell 14 at this time
Right end, that is to say, that the space that vacuum cock 13 moves right is extremely limited, even if not setting on valve body 9 at this time
The first stop collar 8 is set, vacuum cock 13 can not also push dummy piston 7 and move right.
After the liquid air-flow body of high pressure is entered in plunger shaft by air inlet pipe 5, the first air inlet 17 and the second air inlet 18,
Pressure moment in plunger shaft, valve body 9 increases, and fluid passes through the left side rod chamber for entering dummy piston 7 communicating pipe 10, balance
The pressure of 7 left and right sides chamber of piston is equal, if pressure at this time is P, for dummy piston, and according to F=P A,
By power=piston cross-sectional area × P to the left, by power to the right=(cross-sectional area-piston rod 16 of piston it is transversal
Area) × P, the two difference is that the left, dummy piston 7 will be moved to the left certainly, and the resultant force being subject to is the cross of piston rod 16
Sectional area × P.
After dummy piston 7 is moved to the left, will by 16 pushing tow vacuum cock 13 of piston rod, for vacuum cock 13,
Since it is vacuum between the shell bottom of shell 14, so its power to the left being subject to only has the thrust of dummy piston 7, by
Power to the right be atmospheric pressure × dummy piston 7 cross-sectional area.
Certainly, during dummy piston 7 is moved to the left, the first air inlet 17 is gradually staggered with the second air inlet 18,
Air inlet aperture gradually becomes smaller, therefore the pressure in plunger shaft is gradually reduced, that is to say, that dummy piston 7 be subject to
Left resultant force is gradually reduced, when pressure reduces to a certain extent, it is assumed that be reduced to P1, the at this moment cross-sectional area of piston rod 16
×P1The cross-sectional area of=atmospheric pressure × dummy piston 7,7 stress balance of dummy piston, will no longer be moved at this time, and air inlet is opened
Degree no longer changes, and the output pressure of valve body 9 is just stable in P1。
The process of above-mentioned this pressure regulation decompression is spontaneous progress, driving and intervening for any external force is not needed, due to big
Air pressure is 0.1MPa by force, is fixed and invariable, therefore final output pressure P1Cross-sectional area/piston of=0.1 × dummy piston 7
The cross-sectional area of bar 16, it appears that the size of output pressure depends entirely on the ratio between the cross-sectional area of dummy piston 7 Yu piston rod 16,
In the case where other component structural size constancies, it need to only change the cross-sectional area ratio of dummy piston 7 and piston rod 16 i.e.
It can be obtained the output pressure of a certain steady state value, therefore in design, the transversal of control dummy piston 7 and piston rod 16 can be passed through
Area ratio obtains an optimal setting output pressure, and the ratio is bigger, then it is bigger to set output pressure, on the contrary then get over
It is small.
In this embodiment, it is to be threadedly coupled with balance constant pressure mechanism due to constant force mechanisms, is needing to adjust setting
When output pressure, entire constant force mechanisms need to only be removed completely, change the constant force machine of the dummy piston with another specification
Structure can be obtained different output pressure value, therefore during fabrication, can manufacture a few set constant force mechanisms more, different constant force mechanisms it
Between difference be that the difference of vacuum cock cross-sectional area.
When the pressure of the high-pressure fluid in air inlet pipe 5 is more stable always, dummy piston 7 can be always held at equilibrium-like
State, air inlet aperture will not change, and output pressure persistently keeps stable.But when the pressure of the high-pressure fluid in air inlet pipe 5
When strong unstable, such as when the pressure of high-pressure fluid increases suddenly, the pressure in plunger shaft also can instantaneously increase at this time, balance
The equilibrium state of piston 7 is broken, and dummy piston 7 will be moved to the left, and air inlet aperture becomes smaller again, and then the pressure in plunger shaft
It can decrease by force, final dummy piston 7 reaches balance again, to ensure that output pressure remains at setting value.
And when the pressure of high-pressure fluid reduces suddenly, the pressure in plunger shaft also can be reduced instantaneously at this time, dummy piston 7
Equilibrium state be broken, dummy piston 7 will move right, and air inlet aperture can become larger, and then the pressure in plunger shaft has
It is increased, final dummy piston 7 reaches balance again, to ensure that output pressure remains at setting value.
It loops back and forth like this, regardless of the pressure of high-pressure fluid is how many, as long as the cross section of dummy piston 7 and piston rod 16
Product ratio is certain, then moving left and right by dummy piston 7, so that it may which the size for changing air inlet aperture finally makes
Dummy piston can be adjusted to equilibrium state, at the same the value of output pressure be also always it is constant, so that it is defeated to realize constant pressure
Out.
Certainly, above-mentioned self-control process is critically important in addition to having with the cross-sectional area ratio of dummy piston 7 and piston rod 16
Relationship except, the pressure size with the size and high-pressure fluid of the first air inlet 17 and the second air inlet 18 is also to have relationship
, if such as the pressure of high-pressure fluid instantaneously increase severely, dummy piston 7 is moved to the left quickly, if the pressure that atmospheric pressure generates
Power is difficult to that dummy piston is made to keep balance, then dummy piston is possible to that the first air inlet 17 can be blocked, air inlet aperture becomes
It is 0, fluid can be truncated at this time.After this not excessive segment fluid flow exits valve body 9 and Low-pressure Gas Pipeline, in atmospheric pressure
Under effect, dummy piston can move right again, and air inlet aperture becomes larger, and fluid can enter plunger shaft again and suffer, but this
Kind situation, which is not that the present invention is desired, to be occurred, because the way of output desultory in this way influences whether the normal of liquid gas well
Continuous production.
Practical according to current production, pressure when liquid air-flow body reaches well head is and desired generally all in more than ten megapascal
Output pressure be 4 MPa or so, therefore already allowed for when designing the size of the first air inlet 17 and the second air inlet 18
The pressure of liquid air-flow body floats, so as to evading the situation that the first air inlet 17 and the second air inlet 18 are staggered completely,
It is exactly dummy piston during moving left and right, air inlet has certain aperture always, avoids constant pressure valve by liquid air-flow body
Truncation, influences normally to produce.
So as previously mentioned, shell bottom of the vacuum cock 13 apart from shell 14 is closer, while dummy piston 7 is also without to the right
Mobile space, allows in this way, if the pressure of liquid air-flow body is lower than the output pressure value set, atmospheric pressure can be pushed away
Dynamic balancing piston 7 moves right always, and until air inlet aperture becomes 0, thus fluid to cut-off, that also just can not be just
Often produce.Therefore shell bottom of the vacuum cock 13 apart from shell 14 is closer, while the sky that dummy piston 7 does not also move right
Between, in this way just in case fluid can be entered directly by constant pressure valve when the pressure of liquid air-flow body is lower than the output pressure value set
In Low-pressure Gas Pipeline, constant pressure valve is similar to the effect of an intermediate connecting leg at this time, does not play pressure regulation.
In the other embodiments of trequency piston type constant pressure valve: can also be not provided with preventing first piston from deviating from valve in valve body
Second Stop structure of body；It can also be not provided with preventing the first Stop structure of second piston abjection shell in shell；First is living
Piston import beyond the Great Wall can also be unequal with the fluid inlet internal diameter on valve body, for example, piston import internal diameter be less than fluid into
Mouth internal diameter；It can also be not provided with silk plug on the shell bottom of shell, for example can be vacuumized by atmosphere connection port, then reassemble
Two pistons；Valve body may not be open at one end, the closed tubular structure of the other end, for example both ends are all closed tubular knots
Structure opens up small a fluid outlet or fluid outlet in wherein one end and is also provided on barrel；First piston can not also
Open at one end, the closed tubular structure of the other end, for example, piston import, piston outlet and plunger shaft internal diameter be equal and
Respectively less than piston end surface size；Second piston is also possible to threaded hole towards the pushing tow hole opened up on the end face of piston rod, and second
Piston is first connect with piston rod thread, and then pushing tow cooperates again；Second piston is towards can not also open up on the end face of piston rod
Pushing tow hole, second piston can cooperate with the direct pushing tow of piston rod；Constant force mechanisms are also possible to other perseverances being connected with piston rod
Power device, such as application publication number are that a kind of adjustable constant force disclosed in the Chinese invention patent application of CN103723648A is defeated
Device out, or one kind as disclosed in the Chinese invention patent application that application publication number is CN103511392A are not disturbed by tracheae
The constant force output device of influence or other kinds of constant force device.
Claims (6)
1. a kind of trequency piston type constant pressure valve, including valve body, it is characterised in that: be provided with fluid inlet on valve body and fluid goes out
Mouthful, valve internal guide slidable fit has the first piston with piston rod, and the connection fluid inlet is offered on first piston
Piston import and piston outlet with fluid outlet so that valve body upper fluid outlet pressure can by the movement of first piston into
Row adjusts, and the rod chamber of connection first piston two sides and the communicating pipe of rodless cavity, the piston rod of first piston are provided on valve body
It stretches out except valve body and is connected with constant force mechanisms, the constant force mechanisms include the shell for being fixedly connected on the rod chamber side of valve body
Body, the shell have the communication port being connected with atmosphere and the shell bottom being connected with valve body, and the piston rod of first piston passes through
Shell bottom is simultaneously protruded into shell, and shell internal guide slidable fit has a second piston, and second piston and piston rod are that pushing tow cooperates and the
It is vacuum between two pistons and shell bottom.
2. trequency piston type constant pressure valve according to claim 1, it is characterised in that: shell bottom releasable connection has to take out
The silk plug of vacuum.
3. trequency piston type constant pressure valve according to claim 1, it is characterised in that: being provided in shell prevents second piston
Deviate from the first Stop structure of shell.
4. trequency piston type constant pressure valve described in any one according to claim 1 ~ 3, it is characterised in that: the valve body is in one end
Opening, the closed tubular structure of the other end, the opening constitute the fluid outlet of valve body, and the fluid inlet is provided with valve body
On barrel, the first piston is also in open at one end, the closed tubular structure of the other end, the open work for constituting first piston
Plug outlet, the piston import are provided on the barrel of first piston, in first piston there is connection piston import and piston to go out
The plunger shaft of mouth.
5. trequency piston type constant pressure valve according to claim 4, it is characterised in that: piston import and valve on first piston
Fluid inlet internal diameter on body is equal.
6. trequency piston type constant pressure valve described in any one according to claim 1 ~ 3, it is characterised in that: be provided in valve body anti-
Only the second Stop structure of first piston abjection valve body.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811467064.7A CN109707885B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
| CN201710063345.5A CN107061817B (en) | 2017-02-03 | 2017-02-03 | A kind of trequency piston type constant pressure valve |
| CN201811466170.3A CN109654269B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109424332B (en) * | 2017-08-21 | 2021-09-03 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | Natural gas well constant pressure throttling arrangement |
| CN108543679A (en) * | 2018-06-15 | 2018-09-18 | 重庆草衣木食文化传播有限公司 | A kind of painting installation |
| CN109737212B (en) * | 2019-01-25 | 2023-11-14 | 浙江科博电器有限公司 | Waste water valve with anti-scale and silencing functions |
| CN110156017A (en) * | 2019-04-26 | 2019-08-23 | 大连伊立特科技有限公司 | It produces dry ice and crystallizes cylinder barrel with piston type |
| CN110333113B (en) * | 2019-07-11 | 2022-05-27 | 中国海洋大学 | Hydrate sample water saturation device and method |
| CN110594231B (en) * | 2019-08-07 | 2021-08-20 | 九江七所精密机电科技有限公司 | Internal feedback self-sealing packaging clamping device |
| CN112431985B (en) * | 2019-08-16 | 2022-11-22 | 合肥源康信息科技有限公司 | Pipe line fluid turbulence restraining device |
| CN111441744B (en) * | 2020-05-08 | 2023-11-14 | 中国石油天然气集团有限公司 | High-pressure energy storage and pressure release start type pressure control valve and use method thereof |
| CN111927962B (en) * | 2020-09-27 | 2021-01-26 | 潍坊工程职业学院 | Negative pressure control type air connecting valve |
| CN113757434A (en) * | 2021-08-03 | 2021-12-07 | 唐山黑猫炭黑有限责任公司 | Bleeding valve in carbon black production line |
| CN114233532B (en) * | 2021-12-30 | 2023-11-03 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109707885B (en) | 2020-04-07 |
| CN109707885A (en) | 2019-05-03 |
| CN109654269A (en) | 2019-04-19 |
| CN109654269B (en) | 2020-03-27 |
| CN107061817A (en) | 2017-08-18 |
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