CN107061817A - 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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- CN107061817A CN107061817A CN201710063345.5A CN201710063345A CN107061817A CN 107061817 A CN107061817 A CN 107061817A CN 201710063345 A CN201710063345 A CN 201710063345A CN 107061817 A CN107061817 A CN 107061817A
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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
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- General Engineering & Computer Science (AREA)
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- Control Of Fluid Pressure (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention provides a kind of trequency piston type constant pressure valve, including valve body, fluid inlet and fluid issuing are provided with valve body, valve internal guide slidable fit has the first piston with piston rod, connection fluid inlet and the piston import of fluid issuing and piston outlet are offered on first piston, the rod chamber of connection first piston both sides and the communicating pipe of rodless cavity are provided with valve body, the piston rod of first piston stretches out outside valve body and is connected with constant force mechanisms, constant force mechanisms include the housing for being fixedly connected on the rod chamber side of valve body, the shell bottom that housing 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 improves the stability in use of constant pressure valve using constant force mechanisms independent of regulation spring, and fluid output pressure is accurate, automatically adjusting with first piston in use, and fluid output pressure remains stable.
Description
Technical field
The present invention relates to a kind of trequency piston type constant pressure valve.
Background technology
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
Thing and frozen block and occur frequent jams.In order to prevent the formation of hydrate, hydrate can be reduced by being added generally into natural gas
The hydrate inhibitor for natural gas of temperature is generated, such as methanol, so as to reduce the dew point of natural gas, prevents the generation of hydrate.
Need to configure note alcohol pipeline and sewage containing methanol processing equipment when in this way, note the enforcement difficulties of methanol technics than larger,
And there are three big drawbacks using methanol：Firstth, methanol is poisonous, there is certain harm；Secondth, methanol usage is big, and totle drilling cost is high；The
3rd, note alcohol and the investment of sewage treatment equipment and auxiliary facility are 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 arranged on into oil pipe appropriate location, the reducing pressure by regulating flow expansion process of natural gas is occurred in well, utilizes simultaneously
Ground temperature is heated to the air-flow after throttling, the gas flow temperature after throttling is significantly gone up, higher than air-flow after throttling
Hydrate generation temperature under pressure condition, so as to reach the purpose that preventing and treating hydrate is generated in pit shaft and surface line.Underground
Throttling technology can reduce pit shaft and surface line pressure, and solution blocking-proof result is notable, compared with high-pressure gas collection pattern, the development mode
Individual well note alcohol pipeline investment and daily note alcohol fee of material can be saved, while because of the reduction of ground gas gathering line stress levels, 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 higher gas field of some aquifer yields, such as up to 72.5 sides/day, gas well is taken itself
, there is larger discharge opeing problem in liquid scarce capacity；Throttling technology is used in this kind of high yield liquid gas well under conventional well simultaneously, due to oil
Pit shaft is easily caused in pipe after installation flow controller obstructed, be unfavorable for the production of high yield liquid Gas Well Liquid Continuous Withdrawal, easily cause high yield
Liquid gas well plug-ging, water logging stop production, and seriously limit gas field production capacity performance.
In order to ensure high yield liquid liquids continuous removal steady production, and the defeated development mode of gas field low pressure collection must is fulfilled for again
It is required that, therefore under the conditions of underground throttle device is not installed, a pressure-reducing valve can be typically installed at well head, to realize high yield liquid gas
Well reducing pressure by regulating flow is produced, and on the one hand effectively reduces surface line pressure, reduces security risk, investment reduction；On the other hand can have
Effect preventing and treating hydrate generation, is conducive to the discharge opeing of gas well continuous-stable to produce, can improve gas field development benefit.
Common pressure-reducing valve is all that the output pressure after decompression is controlled by adjusting spring on the market at present, such as authorizes public
Announcement number is CN201715057U, a kind of authorized announcement date dummy piston disclosed in 2011.01.19 Chinese utility model patent
Induction type pneumatic pressure-release valve, the pressure-reducing valve needs to set output pressure by twisting bonnet with compression adjustment spring when in use
Power, while the downward top pressure valve element of dummy piston can also be made by twisting bonnet, compression adjustment spring, so that between valve element and valve seat
Depart from and form one and be open, the circulation passage of fluid is so also opened at last, enables a fluid to enter from air inlet and from gas outlet
Go out.When fluid pressure be less than preset pressure when, opening will not change, when fluid pressure be more than preset pressure when, piston by
The upward feedback pressure arrived be more than spring preset pressure, now piston move up, valve element under action of reset spring also to
Upper movement, opening diminishes, and opening no longer changes after reducing to a certain extent, and system reaches a balance, the outlet pressure of pressure-reducing valve
Power is settled out.So move in circles, the outlet pressure of pressure-reducing valve is held essentially constant, be stable in a certain scope.
Though this traditional pressure-reducing valve can play depressurization, true in the component structural size such as valve body, valve element
In the case of fixed, its output pressure depends entirely on the preset state of regulation spring, also needs to manually adjust it before use
Section, and the output pressure adjusted is how many, the just full experience by operating personnel, or can only measure after output pressure
It understand that, if improper, in addition it is also necessary to further adjustment, adjust, using very inconvenient.In addition, the compression of regulation spring
Amount is being continually changing with the fluctuation of fluid input pressure, and with the extension of use time, regulation spring is in compression many times
After return action, its elastic force can decline, and especially adjust spring in corrosion and scaling or after being blocked by impurity, it makes
It can be had a greatly reduced quality with performance, decompression and the using effect of pressure-reducing valve, therefore the service life of this pressure-reducing valve will be had a strong impact on
It is bad with stability.
The content of the invention
It is an object of the invention to provide it is a kind of independent of regulation spring, stability in use is higher 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 is adopted the following technical scheme that：
Fluid inlet and fluid issuing are provided with a kind of trequency piston type constant pressure valve, including valve body, valve body, valve internal guide is slided
It is dynamic to be equipped with the piston for being offered on the first piston with piston rod, first piston and connecting the fluid inlet and fluid issuing
Import and piston outlet are set on valve body so that the pressure of valve body upper fluid outlet can be adjusted by the movement of first piston
There are the rod chamber of connection first piston both sides and the communicating pipe of rodless cavity, the piston rod of first piston stretches out outside valve body and connected
There are constant force mechanisms.
The constant force mechanisms include the housing for being fixedly connected on the rod chamber side of valve body, and the housing has and big gas phase
The connected entrance of connection and the shell bottom being connected with valve body, the piston rod of first piston pass through shell bottom and stretched into housing, in housing
Being oriented to slidable fit has second piston, and second piston and piston rod are pushing tow cooperation and are vacuum between second piston and shell bottom.
Shell bottom releasable connection has the plug for being easy to vacuumize.
The first Stop structure for preventing second piston from deviating from housing is provided with housing.
The tubular structure that the valve body is closed in one end open, the other end, the opening constitutes the fluid issuing of valve body, institute
State fluid inlet to be opened on the barrel of valve body, the tubular structure that the first piston is also closed in open at one end, the other end, institute
The open piston outlet for constituting first piston is stated, the piston import is opened on the barrel of first piston, is had 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 from deviating from valve body is provided with valve body.
The beneficial effects of the present invention are：Due to offering connection valve body upper fluid import and fluid issuing on first piston
Piston import and piston outlet, therefore when first piston is moved in valve body, overlapped when piston import with fluid inlet
When opening ratio is larger, the fluid flowed through is relatively more, and now the pressure of fluid issuing is than larger, when piston import and fluid inlet weight
When the opening ratio of conjunction is smaller, the pressure of fluid issuing will diminish, therefore can adjust valve body upstream by the movement of first piston
The pressure of body outlet；
Due to being provided with the rod chamber of connection first piston both sides and the communicating pipe of rodless cavity on valve body, therefore rod chamber and without bar
The fluid pressure of chamber is equal, but is unequal by the Fluid pressure of rod chamber and rodless cavity on first piston, because
Rod chamber has had more a piston rod, and the cross-sectional area of its stress is less than the lifting surface area of rodless cavity, therefore suffered by first piston
Make a concerted effort be directed towards rod chamber side, and this makes a concerted effort to be equal to the cross-sectional area that fluid pressure is multiplied by piston rod, that is,
Say, the trend of first piston always oriented rod chamber side movement；
Because the piston rod of first piston is stretched out outside valve body and is connected with constant force mechanisms, therefore can be right by the constant force mechanisms
Piston rod applies a constant force opposite with the resultant direction, and when constant force value, which is equal to, makes a concerted effort to be worth, first piston is maintained for putting down
Weighing apparatus, aperture that now piston import is overlapped with fluid inlet holding is constant, and constant pressure valve will export constant-pressure fluid, and the constant pressure value is just etc.
, can be according to the transversal of known piston rod in the cross-sectional area of set constant force value divided by piston rod, therefore when setting
Area, sets a constant force value, then the constant pressure value that constant pressure valve is exported can just be realised that；
In use, if the fluid pressure into valve body changes, because the constant force value of constant force mechanisms does not change, therefore first
The poised state of piston will be broken, and when fluid pressure change is big, first piston will be moved from trend rod chamber side, with this
Meanwhile, the aperture that piston import is overlapped with fluid inlet will diminish, and the fluid pressure into valve body will diminish automatically, until first
Piston reaches balance again, and the fluid pressure that now constant pressure valve is exported is still the constant pressure value；On the contrary, when fluid pressure becomes
Hour, first piston will be moved from trend rodless cavity side, at the same time, and the aperture that piston import is overlapped with fluid inlet will become
Greatly, the fluid pressure into valve body will become big automatically, until first piston reaches balance again, the stream that now constant pressure valve is exported
Body pressure is still the constant pressure value, that is to say, that first piston can be adapted to automatically by itself movement into valve body
The change of fluid pressure, so that constant pressure valve exports the constant pressure value of a determination all the time.
Therefore, trequency piston type constant pressure valve of the invention is independent of regulation spring, but uses a constant force mechanisms, from
And the risk that the performance for having evaded regulation spring can change, 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
That is can be known, and the automatically adjusting with first piston in, fluid output pressure remains stable, and using effect shows
Write.
Brief description of the drawings
Fig. 1 is the structural representation of one embodiment of trequency piston type constant pressure valve in the present invention.
In figure：1. the first sealing ring；2. plug；3. the second sealing ring；4. the 3rd sealing ring；5. air inlet pipe；6. the 4th is close
Seal；7. dummy piston；8. the first spacing ring；9. valve body；10. communicating pipe；11. the 5th sealing ring；12. the 6th sealing ring；13.
Vacuum cock；14. housing；15. the second spacing ring；16. piston rod；17. the first air inlet；18. the second air inlet.
Embodiment
The embodiment of trequency piston type constant pressure valve is as shown in figure 1, the constant force mechanisms and balance constant pressure machine arranged including left and right
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 spacing ring 8
And each sealing ring, constant force mechanisms include housing 14, vacuum cock 13, 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 closed in left end, the tubular structure of right-end openings, on valve body 9
It is provided with the opening structure of the fluid inlet and fluid issuing, wherein fluid issuing right-hand member on valve body 9 that are flowed in and out for fluid
Into the right-hand member of valve body 9 can directly connect Low-pressure Gas Pipeline.Fluid inlet is the first air inlet being opened 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 directly can be connected with high pressure line.
It is oriented to be slidingly sealed in the inner chamber of valve body 9 and is equipped with the first piston with piston rod 16, the first piston is flat
Weighed piston 7, and dummy piston 7 is also closed in left end, the tubular structure that right-hand member is open, and offering connection first on dummy piston 7 enters
Gas port 17 and the piston import of fluid issuing and piston outlet, wherein piston outlet are made up of the opening of the right-hand member of dummy piston 7, living
It is to have the second air inlet 18 of connection in the second air inlet 18 being opened on the barrel of dummy piston 7, dummy piston 7 to fill in mouth
With the plunger shaft of piston outlet.
Second air inlet 18 is used to overlap relatively with the first air inlet 17 on valve body 9, so as to form opening for a certain size
Degree, so that fluid is flowed into valve body 9, the internal diameter of the first air inlet 17 and the second air inlet 18 is equal.In order to ensure sealing property,
The 3rd sealing ring 4 and the 4th sealing ring 6, the 3rd sealing ring 4 are respectively arranged between the inwall of valve body 9 on dummy piston 7
It is located at the left and right sides of the second air inlet 18 respectively with 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 connected entrance respectively, two connected entrances it
Between be welded with communicating pipe 10, the caliber of communicating pipe 10 is equal with the internal diameter of connected entrance, and the connection of communicating pipe 10 dummy piston 7 is left
The rod chamber and rodless cavity of right both 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 in the left side of dummy piston 9 by communicating pipe 10, makes the left and right sides of dummy piston 9
The fluid pressure of cavity keeps equal.
Piston rod 16 on dummy piston 7 is long, extends to the left side blind end for passing valve body 9, piston rod 16
Cooperation is slidingly sealed for guiding between valve body 9, therefore second sealing is provided with the endoporus 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 its path section is thread segment, the housing 14 of constant force mechanisms
Right-hand member is provided with screwed hole, and housing 14 is threadably secured with valve body 9 and is connected.The left end of housing 14 has the company being connected with air
Mouth, right-hand member are opened up for a shell bottom, after the shell bottom that is to say that the bottom of the screwed hole, housing 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 housing 14
In inner chamber, cooperation is slidingly sealed for guiding between piston rod 16 and shell bottom, therefore in the endoporus at shell bottom between piston rod 16
It is provided with the 5th sealing ring 11.
It is oriented to be slidingly sealed in the inner chamber of housing 14 and is equipped with second piston, the second piston 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 plug 2 on the shell bottom of housing 14, when pulling down plug 2, it is possible to convenient
Vacuum pumping, so as to lay down or drain the gas pressure intensity between vacuum cock 13 and shell bottom, makes the part pressure be
Zero, load onto after plug 2, it is possible to keep vacuum state, therefore plug 2 is equivalent to the effect of relief valve.It is good in order to ensure
Sealing effectiveness, the first sealing ring 1 is provided between plug 2 and shell bottom endoporus, in the inwall of vacuum cock 13 and housing 14
Between be provided with the 6th sealing ring 12.
Coordinate between vacuum cock 13 and piston rod 16 for pushing tow, coordinate for convenience, lived in the direction of vacuum cock 13
The pushing tow hole for being installed with the end of piston rod 16 is offered on the end face of stopper rod 16.
The second Stop structure of the moving limit moved right for limiting balance piston 7 is provided with valve body 9, this second
Stop structure can prevent dummy piston 7 from deviating from valve body 9, in this embodiment, and second Stop structure is to be threaded in
The first spacing ring 8 on the inwall of valve body 9, and when the second air inlet 18 on the first air inlet 17 and dummy piston 7 on valve body 9
When being that air inlet aperture is maximum when completely to correspondence, dummy piston 7 and the distance between the first spacing ring 8 are very small, now put down
The distance that weighing apparatus piston 7 can move right is very limited.Certainly in other embodiments, when air inlet aperture is maximum, balance
There can also be enough distances between the spacing ring 8 of piston 7 and first, or the second Stop structure is provided in the inwall of valve body 9
On spacer pin, now when air inlet aperture is maximum, dummy piston 7 directly block can coordinate with the spacer pin, balance work
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 with housing 14, this
One Stop structure can prevent vacuum cock 13 from deviating from housing 14, in this embodiment, and first Stop structure connects for screw thread
The centre bore being connected on the second spacing ring 15 in the inner chamber of housing 14, the second spacing ring 15 constitutes the intercommunicating pore with atmosphere,
Certainly in other embodiments, the first Stop structure can also be provided in the spacer pin in the inner chamber of housing 14.
The operation principle of trequency piston type constant pressure valve is：The constant pressure valve be at the well head of liquid gas well, instead of
The pressure-reducing valve of existing regulation spring, carries out reducing pressure by regulating flow, and keep the fluid pressure of output to the liquid air-flow body of high pressure
In the constant pressure valve of a steady state value.In use, air inlet pipe 5 is connected with high pressure line, right output port and the low pressure appendix of valve body 9
Road is connected, and the original state of constant pressure valve is the first air inlet 17 and the second air inlet as shown in figure 1, when not being passed through high-pressure fluid
The correspondence completely of mouth 18, now air inlet aperture is maximum, it is necessary to which explanation, now vacuum cock 13 is also substantially at housing 14
Low order end, that is to say, that the space that vacuum cock 13 moves right is extremely limited, even if not set on valve body 9 now
The first spacing ring 8 is put, 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 increase in plunger shaft, valve body 9, fluid is by entering the left side rod chamber of dummy piston 7 communicating pipe 10, balance
The pressure of the left and right sides chamber of piston 7 is equal, if pressure now is P, for dummy piston, according to F=P A, its
By cross-sectional area × P of power=piston to the left, its by power to the right=（Cross-sectional area-piston rod 16 of piston it is transversal
Area）× P, both differences are that to the left, dummy piston 7 will be moved to the left certainly, and what it was subject to makes a concerted effort for the horizontal stroke of piston rod 16
Sectional area × P.
After dummy piston 7 is moved to the left, will by the pushing tow vacuum cock 13 of piston rod 16, for vacuum cock 13,
Because it is vacuum between the shell bottom of housing 14, so its power to the left being subject to only has the thrust of dummy piston 7, its 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 gradually staggers with the second air inlet 18,
Air inlet aperture is tapered into, therefore the pressure in plunger shaft is gradually reduced, that is to say, that dummy piston 7 be subject to
It is left to make a concerted effort to be 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, now the stress balance of dummy piston 7, be will no longer be moved, and air inlet is opened
Degree no longer changes, and the output pressure of valve body 9 is just stablized in P1。
The process of above-mentioned this pressure regulation decompression is spontaneous progress, it is not necessary to which any external force is driven and intervened, due to big
Air pressure is by force 0.1MPa, is changeless, 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 cross-sectional area of dummy piston 7 and piston rod 16,
In the case of 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 obtain the output pressure of a certain steady state value, therefore in design, can be by controlling the transversal of dummy piston 7 and piston rod 16
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, because constant force mechanisms are with balancing constant pressure mechanism to be threadedly coupled, therefore needing to adjust setting
During output pressure, only whole constant force mechanisms need to completely be pulled down, change the constant force machine of the dummy piston with another specification
Structure can obtain 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 is raised suddenly, now the pressure in plunger shaft also can instantaneously increase, balance
The poised state of piston 7 is broken, and dummy piston 7 will be moved to the left, and air inlet aperture diminishes again, and then the pressure in plunger shaft
It can decrease by force, final dummy piston 7 reaches balance again, so as to ensure that output pressure remains at setting value.
And when the pressure of high-pressure fluid is reduced suddenly, now the pressure in plunger shaft also can be reduced instantaneously, dummy piston 7
Poised state be broken, dummy piston 7 will move right, and air inlet aperture can become big, and then the pressure in plunger shaft has
Raised, final dummy piston 7 reaches balance again, so as to ensure that output pressure remains at setting value.
So move in circles, no matter 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 pass through moving left and right for dummy piston 7, it is possible to change the size of air inlet aperture, finally make
Dummy piston can be adjusted to poised state, while the value of output pressure is also constant all the time, it is achieved thereby that constant pressure is defeated
Go out.
Certainly, above-mentioned self-control process has critically important except the cross-sectional area ratio with dummy piston 7 and piston rod 16
Relation outside, 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 relation
, if the pressure of such as high-pressure fluid instantaneously increases severely, dummy piston 7 is moved to the left quickly, if the pressure that atmospheric pressure is produced
Power is difficult to make dummy piston keep balance, then dummy piston is possible to that the first air inlet 17 can be blocked, and air inlet aperture becomes
For 0, now fluid can be truncated.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 big, and fluid can be suffered into plunger shaft again, but this
The situation of kind, which is not that the present invention is desired, to be occurred, because the so desultory way of output influences whether the normal of liquid gas well
Continuous production.
According to current produce reality, pressure during liquid air-flow body arrival well head is general all at more than ten MPas, and desired
Output pressure for 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 stagger completely,
Be exactly dummy piston during moving left and right, air inlet has certain aperture all the time, it is to avoid constant pressure valve is by liquid air-flow body
Block, the normal production of influence.
So as it was previously stated, vacuum cock 13 is closer apart from the shell bottom of shell 14, while dummy piston 7 is also without to the right
Mobile space, is so allowed for, if the pressure of liquid air-flow body is less than the output pressure value set, atmospheric pressure can be pushed away
Dynamic balancing piston 7 moves right always, and until air inlet aperture is changed into 0, thus fluid to cut-off, that also just can not be just
Often produce.Therefore vacuum cock 13 is closer apart from the shell bottom of shell 14, while the sky that dummy piston 7 does not also move right
Between, so just in case when the pressure of liquid air-flow body is less than the output pressure value set, fluid can be entered directly by constant pressure valve
In Low-pressure Gas Pipeline, now constant pressure valve is similar to the effect of connecting leg in the middle of one, does not play pressure regulation.
In the other embodiment of trequency piston type constant pressure valve：It can also be not provided with preventing first piston from deviating from valve in valve body
Second Stop structure of body；The first Stop structure for preventing second piston from deviating from housing can also be not provided with housing；First lives
Piston import beyond the Great Wall can also be unequal with the fluid inlet internal diameter on valve body, such as the internal diameter of piston import enters less than fluid
Intraoral footpath；Plug can also be not provided with the shell bottom of housing, such as can be vacuumized by atmosphere connection port, is then reassembled
Two pistons；Valve body may not be one end open, the tubular structure of other end closing, such as two ends are all the tubular knots of closing
Structure, one end opens up a small fluid issuing wherein, or fluid issuing is also opened on barrel；First piston can not also
Be open at one end, the other end closing tubular structure, such as the internal diameter of piston import, piston outlet and plunger shaft it is equal and
Respectively less than piston end surface size；Second piston towards the pushing tow hole opened up on the end face of piston rod can also be screwed hole, second
Piston is first connected with piston rod thread, and then pushing tow coordinates again；Second piston is towards can not also open up on the end face of piston rod
Pushing tow hole, second piston can coordinate with the direct pushing tow of piston rod；Constant force mechanisms can also be other perseverances being connected with piston rod
Power apparatus, such as application publication number a kind of adjustable constant force disclosed in CN103723648A Chinese invention patent application are defeated
Go out device, or one kind disclosed in CN103511392A Chinese invention patent application is not disturbed by tracheae such as application publication number
The constant force output device of influence, or other kinds of constant force device.
Claims (7)
1. a kind of trequency piston type constant pressure valve, including valve body, it is characterised in that：Fluid inlet is provided with valve body and fluid goes out
Mouthful, valve internal guide slidable fit, which has, offers the connection fluid inlet on the first piston with piston rod, first piston
Piston import and piston outlet with fluid issuing is so that the pressure of valve body upper fluid outlet can be entered by the movement of first piston
The rod chamber of connection first piston both sides and the communicating pipe of rodless cavity, the piston rod of first piston are provided with row adjustment, valve body
Stretch out outside valve body and be connected with constant force mechanisms.
2. trequency piston type constant pressure valve according to claim 1, it is characterised in that：The constant force mechanisms include being fixedly connected
Housing in the rod chamber side of valve body, the housing has the connected entrance being connected with air and the shell being connected with valve body
Bottom, the piston rod of first piston passes through shell bottom and stretched into housing, and shell internal guide slidable fit has second piston, second piston
With piston rod be pushing tow coordinate and be vacuum between second piston and shell bottom.
3. trequency piston type constant pressure valve according to claim 2, it is characterised in that：Shell bottom releasable connection, which has, to be easy to take out
The plug of vacuum.
4. trequency piston type constant pressure valve according to claim 2, it is characterised in that：Being provided with housing prevents second piston
Deviate from the first Stop structure of housing.
5. the trequency piston type constant pressure valve according to claim 1 ~ 4 any one, it is characterised in that：The valve body is in one end
Opening, the tubular structure of other end closing, the opening constitute the fluid issuing of valve body, and the fluid inlet is opened in valve body
On barrel, the tubular structure that the first piston is also closed in open at one end, the other end, the open work for constituting first piston
Plug outlet, the piston import is opened on the barrel of first piston, in first piston there is connection piston import and piston to go out
The plunger shaft of mouth.
6. trequency piston type constant pressure valve according to claim 5, it is characterised in that：Piston import and valve on first piston
Fluid inlet internal diameter on body is equal.
7. the trequency piston type constant pressure valve according to claim 1 ~ 4 any one, it is characterised in that：It is provided with valve body anti-
Only first piston deviates from the second Stop structure of valve body.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811466170.3A CN109654269B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
| 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 |
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| CN201811467064.7A Division CN109707885B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
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| CN201811466170.3A Active CN109654269B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
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| CN201811467064.7A Active CN109707885B (en) | 2017-02-03 | 2017-02-03 | Balance piston type constant pressure valve |
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| 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 |
| CN109424332A (en) * | 2017-08-21 | 2019-03-05 | 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 | A kind of natural gas well constant pressure throttling apparatus |
| CN109737212A (en) * | 2019-01-25 | 2019-05-10 | 浙江科博电器有限公司 | A kind of wastewater valve with scale-deposit-preventing and silencing function |
| CN110953357A (en) * | 2019-12-24 | 2020-04-03 | 瑞立集团瑞安汽车零部件有限公司 | Assembled constant pressure valve device with flexible sealing ring |
| CN111441744A (en) * | 2020-05-08 | 2020-07-24 | 中国石油天然气集团有限公司 | High-pressure energy-storage pressure-relief starting type pressure control valve and using method |
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| CN109424332A (en) * | 2017-08-21 | 2019-03-05 | 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 | A kind of natural gas well constant pressure throttling apparatus |
| 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 |
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| CN109737212A (en) * | 2019-01-25 | 2019-05-10 | 浙江科博电器有限公司 | A kind of wastewater valve with scale-deposit-preventing and silencing function |
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| CN112325041A (en) * | 2019-08-16 | 2021-02-05 | 南阳理工学院 | Turbulent suppressing device suitable for pipeline fluid |
| CN110953357A (en) * | 2019-12-24 | 2020-04-03 | 瑞立集团瑞安汽车零部件有限公司 | Assembled constant pressure valve device with flexible sealing ring |
| CN111441744A (en) * | 2020-05-08 | 2020-07-24 | 中国石油天然气集团有限公司 | High-pressure energy-storage pressure-relief starting type pressure control valve and using method |
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| CN114233532A (en) * | 2021-12-30 | 2022-03-25 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107061817B (en) | 2019-01-22 |
| CN109654269A (en) | 2019-04-19 |
| CN109707885A (en) | 2019-05-03 |
| CN109707885B (en) | 2020-04-07 |
| CN109654269B (en) | 2020-03-27 |
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