CN102705552B - Pressure regulator with excessive flow auto-closing function by setting maximum flow - Google Patents
Pressure regulator with excessive flow auto-closing function by setting maximum flow Download PDFInfo
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Abstract
The invention discloses a pressure regulator with an excessive flow auto-closing function by setting the maximum flow. The pressure regulator comprises a pressure regulation actuating mechanism, a pressure regulation transmission mechanism and a pilot valve, wherein a main valve core is mounted on a main valve rod; an excessive flow closing valve core forms an associated secondary throttling structure of a main throttling port and an auxiliary throttling port; the pilot valve can regulate and manipulate a throttle valve port to control the airflow in a shunting air channel according to the forward pressure and backward pressure fluctuation signals; a main film elastic assembly of the pressure regulation transmission mechanism drives the main valve rod to shift, so as to regulate the correlation opening degree of the main and the auxiliary throttling ports and carry out pressure regulation and pressure stabilization; and the maximum flow of the pressure regulator can be conveniently set, and when excessive flow exceptions such as (sudden pipe cracking and leakage accidents) occur, a gas source can be quickly closed for safety protection. The pressure regulator has the advantages of novel design, reasonable structure, convenience for regulation and setting operation, high pressure regulation accuracy, good pressure stability, strong excessive flow safety protection performance, and excellent popularization and application prospect.
Description
Technical field
The present invention relates to the transmission ﹠ distribution body regulator of supplying gas; especially a kind of peak rate of flow can be set the pressure governor of super flow autoshutdown; it is particularly suitable for sending in transmission ﹠ distribution on the pipeline of the inflammable toxic gases such as combustion gas, coal gas and installs and uses, and can set easily peak rate of flow and can carry out safety protection by the quick closedown source of the gas when the burst pipeline burst causes super flow leakage accident.
Background technique
Along with the high speed development of China's Petrochemical, the city is civilian provides abundant combustion gas resource with industrial production in order to satisfy, and combustion gas is distributed to numerous users realizes by blazoning huge Gas pipeline system.It is adopt special-purpose pipe network equipment with source of the gas through the voltage stabilizing of pressure regulation peak regulation process the stable combustion gas of rear line delivery pressure for.We know: distribution pressure and flow are two important technology indexs of gas line network system and safe operation, that is to say: be to guarantee the purpose of pipe network equipment technical measures that system safety operation is taked, exactly will be in the peak rate of flow scope that sets the stable combustion gas of amount of exports constant-pressure for user security.To be objective, pressure surge occurs in the interference that can be subject to unavoidably the factors such as source of the gas situation, ambient temperature, humidity due to the pipe network equipment system in actual motion, when the pressure surge amplitude surpasses permitted value more greatly, will affect the pipe network system transmission ﹠ distribution and send the workmanship of combustion gas, also easily cause equipment accident when serious.For improving Safety performance and the delivery of fuel gas quality of pipe network equipment, be mostly that employing installation pressure governor on the gas transmission supervisor is regulated the control air pressure fluctuation and output pressure is tended towards stability.basic structure and the working principle of existing pressure governor are: fixed installation homophony bellows on main valve, valve rod is fixedly connected on the diaphragm unit of homophony bellows, Pressure Fluctuation Signal in being responsible for signal tube again imports the homophony bellows and acts on diaphragm unit, diaphragm unit is moved up and down from motion tracking pressure surge situation, and the open degree of regulating primary valve by valve rod band movable valve plug displacement, that is to say: when output pressure exceeds the rated pressure undulating value continuation rising that sets or reduces, the open degree that spool moves down thereupon or upper in-migration reduces or increase primary valve is carried out pressure regulation, can realize that output pressure keeps stable pressure regulation purpose.Although the voltage-regulating technique of existing pressure governor is quite ripe and have for many years a use experience in pipe network system, but, need not to dare not or would not speak up, existing pressure governor still exists and uses function singleness, the relatively poor technical pattern defective of Safety performance: in general, it can only merely regulate and control stable output pressure, but can't set peak rate of flow, more can not be when " super flow " anomalous event (as: the pipe explosion leakage accident happens suddenly) occurs automatic closing gas source.In fact, spread all at present the gas line network in town and country in the running of going through for many years, also happen occasionally owing to being subjected to outmoded aging, the impacts factors such as geology is subsided, extreme weather disaster and artificial construction of pipeline to cause " super flow " leakage accident that booster splits pipe.Up to now, the pressure governor of existing use is not possess protective function for this " super flow " disappointing accident.Descendant's work only to be received a crime report is closed further expanding that total air lock valve could prevention accident effectively.This is that existing pressure governor also needs further to improve perfect place, and also petrochemical industry department and gas company are wished the technical problem of solution for many years always just for these.
Summary of the invention
Purpose of the present invention is intended to overcome prior art above shortcomings part and proposes the pressure governor that a kind of peak rate of flow can be set super flow autoshutdown.
The objective of the invention is to realize by following technical solution:
a kind of peak rate of flow can be set the pressure governor of super flow autoshutdown, it comprises pressure regulation actuator, pressure regulation driving mechanism and by valve body, valve seat, valve gap, the command valve that adjusting screw rod consists of, said pressure regulation actuator is by main valve body, be fitted to the valve port seat in main valve body, valve pocket, main valve plug, homophony spring and main valve stem consist of, the main valve plug that is connected in main valve stem is fitted in valve pocket and forms primary choke with valve port seat upper-end surface, said pressure regulation driving mechanism is by the main bellows seat that is installed on the main valve body upper-end surface, main bellows lid and main film elasticity module composition, it is main epistege that main film elasticity assembly is separated main bellows, main hypostegal cavity, the backflow signal tube that is installed on main bellows lid is connected with the valve pocket of giving vent to anger of main valve body, the main valve stem top is connected in main film elasticity assembly, it is characterized in that: close spool and valve port seat lower end surface formation chromaffin body head piece in main valve stem bottom installation excess, main valve stem is provided with center hole and is communicated with the cross-drilled hole of center hole and air cavity, be provided with the delivery outlet that is communicated with air cavity in main bellows seat diapire, main film elasticity assembly is fitted with damp tube, equipped lower membrane module is divided into lower epistege between the valve body of command valve and valve seat, lower hypostegal cavity, be fitted with the lower film spring of membrane module under supporting in valve seat, hypostegal cavity on membrane module consists of on equipped between the valve body of command valve and valve gap, be fitted with the Regulation spring of membrane module in supporting in valve gap, the upper axle head that is fitted to the regulation and control slide-bar in valve body is connected in membrane module, the lower shaft end of regulation and control slide-bar is connected in lower membrane module, be provided with the inlet hole that communicates with lower epistege in valve body, hypostegal cavity in connection, the air pressure balance duct of lower epistege and the air outlet hole that is communicated in air pressure balance duct, fixedly mount connection pipe fitting between the delivery outlet of the inlet hole of valve body and main bellows seat, the front pressure signal tube that is installed on main bellows seat is connected with the air outlet hole of valve body, the rear pressure signal tube that is installed on valve seat is connected with the valve pocket of giving vent to anger of main valve body.
Further say, the present invention also has following technical characteristics:
Be fitted with valve and consist of commander's throttle orifice in the inlet hole of the valve body position that communicates with lower epistege, be embedded with the sealing gasket that adapts with valve in the upper-end surface of lower membrane module.This structural design has splendid throttling action to the shunting air flue, and it closes performance to raising adjusting setting accuracy, voltage-regulation voltage-stabilization reaction velocity and super flow all positive effect.
Also be fitted with the spring seat of supporting Regulation spring in valve gap, adjusting screw rod termination overhead is in central position, spring seat upper-end surface.This structural design can effectively be improved the supporting stability of Regulation spring, is convenient to especially carry out by adjusting screw rod the operation that accurate adjustment is set.
The damp tube front end is provided with the damping mouth that communicates with damping hole.It can effectively improve the slow effect of letting out of damping step-down of damp tube, and induction sensitivity and the transport velocity of raising to Pressure Fluctuation Signal can further improve the pressure regulation stability and super flow is closed performance.
Be through at the equipped sealing cover in interior diapire face position of main bellows seat at main valve stem.This have advantages of easy for installation, good seal performance by sealing cover to the enclosed construction that the air cavity upper end forms, and main valve stem moves flexibility and the air cavity seal all has positive effect to improving.
The pressure governor that the peak rate of flow that the present invention proposes can be set super flow autoshutdown is to carry out as follows work:
Its original state:
Adjusting screw rod, the Regulation spring of command valve are in relaxed state, and the lower film spring in valve seat upwards promotes lower membrane module and makes sealing gasket sealing valve, and commander's throttle orifice is to be in closed condition.
The homophony spring of pressure regulation actuator promotes main valve plug sealing valve port seat upper-end surface downwards, makes that primary choke is closed, the chromaffin body head piece is in maximum opening state.
The main film elasticity assembly of pressure regulation driving mechanism is positioned at equilibrium position, the middle part state of main bellows.
When installing and using, only need that the air inlet valve pocket at main valve body two ends, the valve pocket of giving vent to anger are fixedly connected on the gas transmission supervisor and upward get final product.
The setting of peak rate of flow:
At first require to set the peak rate of flow parameter value according to the pipe network transmission ﹠ distribution body technique rules of supplying gas, and according to fluid mechanics principle calculated flow rate gross data, accurately control and excess is installed on main valve stem closes the spacing that spool is closed in the position of spool, main valve plug and main valve plug and excess, can accurately regulate primary choke aperture and chromaffin body head piece aperture when setting peak rate of flow.It is to set as follows peak rate of flow: open and press before air inlet gate valve on gas transmission supervisor enters gas transmission supervisor front end gas to form in the air inlet valve pocket of main valve body, the body of calming the anger before in the air inlet valve pocket imports in air cavity through center hole, the cross-drilled hole of main valve stem again.according to the pipe network transmission ﹠ distribution body technique rules of supplying gas, the adjusting screw rod of preset command valve is also opened commander's throttle orifice by the lower membrane module of Regulation spring promotion downwards, can form the shunting air flue that is connected by air inlet valve pocket to main hypostegal cavity: the body of calming the anger before in the air inlet valve pocket is by the inlet hole of the connection pipe fitting input command valve that is communicated in air cavity and enter lower epistege after the throttling of commander's throttle orifice, again through air pressure balance duct, air outlet hole is entered in main hypostegal cavity by front pressure signal tube, gas in main hypostegal cavity is after damp tube damping step-down slowly leaks into main epistege, can be entered by the backflow signal tube valve pocket of giving vent to anger of main valve body.At this moment, enter in main hypostegal cavity before calm the anger to know from experience and upwards promote main film elasticity assembly and upwards mention main valve plug by main valve stem primary choke is opened into suitable aperture, simultaneously, excess is closed spool and also can be raised and make the chromaffin body head piece be decreased to suitable aperture.Require to set peak rate of flow parameter value technical order and carry out the accurate adjustment setting operation according to the pipe network transmission ﹠ distribution body technique rules of supplying gas again: slowly rotate the aperture of adjusting screw rod fine adjustment commander throttle orifice and then fine adjustment and set pressure in main hypostegal cavity, the open degree fine adjustment of primary choke and chromaffin body head piece extremely can be satisfied the aperture that sets peak rate of flow, namely complete the setting operation to the pressure governor peak rate of flow.
Obviously, the flow from the air inlet valve pocket of main valve body to the valve pocket of giving vent to anger is that acting in conjunction determines to the air-flow second throttle successively by chromaffin body head piece, primary choke.The limit threshold state that sets the pressure governor peak rate of flow is: the aperture of primary choke equates with the aperture of chromaffin body head piece, that is to say the state of gas flow when the flow velocity of primary choke equates with the flow velocity of chromaffin body head piece.In fact, pressure governor internal pressure system just is in a kind of temporary transient metastable state, that is to say, set just a kind of metastable " state of equilibrium " under Regulation spring, lower film spring, homophony spring and this moment front pressure, rear pressure acting in conjunction of primary choke aperture that commander's throttle orifice aperture determines and chromaffin body head piece aperture by accurate adjustment.
" state of equilibrium " of pressure governor inside is a kind of transient equilibrium state of dynamic instability.Slowly unlatching along with primary choke, gas in the air inlet valve pocket is pressed after can little by little forming in chromaffin body head piece, primary choke enter the valve pocket of giving vent to anger successively, rear pressure signal tube again can with after the body of calming the anger import in the lower hypostegal cavity of command valve and promote to move on lower membrane module and reduce to command the aperture of throttle orifice, because the flow through gas flow of shunting air flue of reducing to make of commander's throttle orifice aperture reduces the pressure that reduces in main hypostegal cavity.Meanwhile, the backflow signal tube also can with after calm the anger that body imports main epistege and the pressure main epistege that raises in, by main epistege and the coefficient result of main hypostegal cavity internal pressure variation: will promote main film elasticity assembly and move down and it is reduced or close primary choke.Again be in new temporary transient " state of equilibrium " under the common compound action of front pressure, rear pressure and the Regulation spring that at this moment, pressure governor again can be at this moment, lower film spring, homophony spring.
The working principle of automatic Regulation:
when the user of gas transmission supervisor rear end begins to increase when making gas outlet valve chamber output end pressure decline occur with gas or with throughput, the backflow signal tube, rear pressure signal tube can respectively " pressure drop signal " be fed back in main epistege and the lower hypostegal cavity of command valve in, command valve can be regulated raise pressure in main hypostegal cavity of the aperture that increases commander's throttle orifice in time from motion tracking " pressure drop " fluctuation situation, promoting the large primary choke aperture of transposition on main film elasticity assembly comes the augmented flow compensation to promote the pressure of output terminal, can realize that automatic Regulation keeps the stable purpose of delivery pressure.In like manner, when gas transmission supervisor front end bleed pressure fluctuation occurs or the output end pressure fluctuation occurs simultaneously, command valve also can be regulated pressure main epistege and main hypostegal cavity in from the aperture that motion tracking " pressure surge " situation is regulated commander's throttle orifice in time, and then carries out pressure regulation by the aperture of regulating primary choke and make output end pressure keep stablizing.
Need to prove: above-mentioned pressure regulation work is carried out in pressure governor sets the peak rate of flow scope, and its voltage-regulation principle is substantially similar to existing pressure governor.
The working principle of super flow autoshutdown:
when output flow sharply increases appearance " super flow " event or burst pipe explosion leakage accident, output flow reaches or surpasses and sets peak rate of flow, that is to say: the aperture that pressure governor is in primary choke equates the limit threshold state of (flow velocity of primary choke equates with the flow velocity of chromaffin body head piece in other words) with the aperture of chromaffin body head piece, the pressure in valve pocket of giving vent to anger of main valve body can fast-descending and make also fast-descending thereupon of pressure in the lower hypostegal cavity of main epistege and command valve, at this moment, commander's throttle orifice will be opened into maximum opening under front pressure effect, make pressure in main hypostegal cavity continue to raise and promote main film elasticity assembly and move on continuing rapidly, can drive that excess closes that spool and main valve plug move on continuing and after crossing fast the limit threshold state of " the primary choke aperture equates with chromaffin body head piece aperture " when setting peak rate of flow by main valve stem: because the aperture of chromaffin body head piece will be less than the aperture of primary choke (flow velocity of primary choke will less than the flow velocity of chromaffin body head piece) in other words, the gas flow that enters the valve pocket of giving vent to anger from the air inlet valve pocket of main valve body will fast-descending, further reduce the interior pressure of lower hypostegal cavity of main epistege and command valve, at this moment, main valve stem will be more rapidly drive excess and close spool and move sealing valve port seat lower end surface on continuing, quick closedown chromaffin body head piece cuts off source of the gas, Accident prevention further expands effectively, system has splendid safety protection performance to pipe network equipment.
The present invention has following outstanding substantive distinguishing features and remarkable progress:
the present invention has initiated main valve plug has been installed on main valve stem, excess is closed spool and is formed the master, chromaffin body head piece " the second throttle structure that is associated ", command valve can be according to " front pressure ", " the rear pressure " fluctuation signal is automatically regulated commander's throttle orifice and is controlled the stream condition in the shunting air flue and it is acted on main film elasticity assembly, drive the related master of adjusting of main valve stem upper and lower displacement by main film elasticity assembly, the aperture of chromaffin body head piece is carried out voltage-regulation voltage-stabilization, its significant technical pattern feature also is: it can set the peak rate of flow of pressure governor, when " super flow " anomalous event (as: burst pipe explosion leakage accident) occurs when, can close rapidly source of the gas and carry out safety protection.The present invention has modern design, rational in infrastructure, the adjusting setting operation is convenient, pressure regulation precision high voltage stability performance is good and " super flow " outstanding advantages that the safety protection performance is strong.
Description of drawings:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the I partial enlarged drawing of Fig. 1, shows the structural representation of command valve.
Fig. 3 is the II partial enlarged drawing of Fig. 1, is illustrated in the structural representation of equipped damp tube on main film elasticity assembly.
Fig. 4 is the III partial enlarged drawing of Fig. 1, shows that main valve stem arranges the structural representation of center hole and cross-drilled hole.
Description of symbols in accompanying drawing:
1 is main hypostegal cavity; 2 is main bellows seat; 3 is main epistege; 4 is connection pipe fitting; 5 is front pressure signal tube; 6 is valve body; 7 is delivery outlet; 8 is main valve plug; 9 are the air inlet valve pocket; 10 is arrow; 11 is rear pressure signal tube; 12 is the valve port seat; 13 is main valve body; Hole centered by 14; 15 for regulating setscrew nut; 16 close spool for excess; 17 are the valve pocket of giving vent to anger; 18 is primary choke; 19 is valve pocket; 20 is main valve stem; 21 is the homophony spring; 22 is sealing cover; 23 are the backflow signal tube; 24 is main film elasticity assembly; 25 is main bellows lid; 26 is spring seat; 27 is upper membrane module; 28 is upper hypostegal cavity; 29 is air pressure balance duct; 30 is air outlet hole; 31 is lower epistege; 32 is lower hypostegal cavity; 33 is lower film spring; 34 is lower membrane module; 35 is valve seat; 36 is sealing gasket; 37 is valve; 38 is pore; 39 is inlet hole; 40 are the regulation and control slide-bar; 41 is valve gap; 42 is Regulation spring; 43 is adjusting screw rod; 44 is damp tube; 45 is damping hole; 46 are the damping mouth; 47 is air cavity; 48 is cross-drilled hole.
Embodiment:
Further describe structural principle of the present invention and mode of execution below in conjunction with accompanying drawing:
A kind of peak rate of flow proposed by the invention can be set the pressure governor of super flow autoshutdown, and it mainly is comprised of pressure regulation actuator, pressure regulation driving mechanism, command valve and the front pressure signal tube 5 of transport gas pressure signal, rear pressure signal tube 11, backflow signal tube 23.Said pressure regulation actuator is made of main valve body 13, the valve port seat 12, valve pocket 19, main valve plug 8, homophony spring 21 and the main valve stems 20 that are fitted in main valve body 13, and the main valve plug 8 that is connected in main valve stem 20 is fitted in valve pocket 19 and forms primary chokes 18 with valve port seat 12 upper-end surfaces.said pressure regulation driving mechanism is by the main bellows seat 2 that is installed on main valve body 13 upper-end surfaces, main bellows lid 25 and main film elasticity assembly 24 consist of, main bellows seat 2, main bellows lid 25 consists of the main bellows of sealing, the main film elasticity assembly 24 main bellows of separation that are fitted between main bellows seat 2 and main bellows lid 25 are main epistege 3, main hypostegal cavity 1, be fitted with damp tube 44 on main film elasticity assembly 24, be provided with the damping mouth 46 that communicates with damping hole 45 at damp tube 44 front ends, the top of main valve stem 20 is fixedly connected on main film elasticity assembly 24, close spool 16 in the excess of main valve stem 20 bottoms and form the chromaffin body head piece with valve port seat 12 lower end surfaces by regulating setscrew nut 15 positioning assemblings, be provided with the cross-drilled hole 48 of center hole 14 and connection air cavity 47 in main valve stem 20, be fitted with the sealing cover 22 of seal air cavity 47 epicoele ends in the interior diapire face position that main valve stem 20 is through at main bellows seat 2, be provided with the delivery outlet 7 that is communicated with air cavity 47 in main bellows seat 2 diapires.said command valve is by valve body 6, valve seat 35, lower membrane module 34, valve gap 41, upper membrane module 27, adjusting screw rod 43 and the sliding regulation and control slide-bar 40 that is assigned in valve body 6 consist of, lower membrane module 34 is fitted to and is divided into lower epistege 31 between valve seat 35 and valve body 6, lower hypostegal cavity 32, be fitted with the lower film spring 33 of membrane module 34 under supporting in valve seat 35, be equipped with hypostegal cavity 28 in membrane module 27 formation between valve body 6 and valve gap 41, be fitted with the Regulation spring 42 of membrane module 27 in supporting in valve gap 41, spring seat 26, adjusting screw rod 43 termination overheads are in spring seat 26 central positions, upper-end surface, the upper axle head of regulation and control slide-bar 40 is fixedly connected on membrane module 27, the lower shaft end of regulation and control slide-bar 40 is fixedly connected on lower membrane module 34, be provided with the inlet hole 39 that communicates with lower epistege 31 in valve body 6, in connection, hypostegal cavity 28, the air pressure balance duct 29 of lower epistege 31 and the air outlet hole 30 that is communicated in air pressure balance duct 29, be fitted with valve 37 and consist of commander's throttle orifices in the inlet hole 39 of valve body 6 position that communicates with lower epistege 31, be embedded with the sealing gasket 36 that adapts with valve 37 in the upper-end surface of lower membrane module 34, fixed installation connection pipe fitting 4 between the delivery outlet 7 of the inlet hole 39 of valve body 6 and main bellows seat 2, the front pressure signal tube 5 that is installed on main bellows seat 2 is connected with the air outlet hole 30 of valve body 6, the backflow signal tube 23 that is installed on main bellows lid 25 is communicated with the valve pocket 17 of giving vent to anger of main epistege 3 and main valve body 13, the rear pressure signal tube 11 that is installed on valve seat 35 is connected with the valve pocket 17 of giving vent to anger of main valve body 13.
It is to carry out as follows work:
The original state of pressure governor:
Adjusting screw rod 43 and the Regulation spring 42 of command valve are in relaxed state, and the lower film spring 33 in valve seat 35 upwards promotes lower membrane module 34 and makes sealing gasket 36 sealing valves 37, and at this moment, commander's throttle orifice of command valve is in closed condition.
The homophony spring 21 of pressure regulation actuator promotes main valve plug 8 sealing valve port seat 12 upper-end surfaces downwards, that is to say: primary choke 18 be close, the chromaffin body head piece is to be in maximum opening state.
The main film elasticity assembly 24 of pressure regulation driving mechanism is the intermediate equilibria location status that is positioned at main bellows.
The installation of pressure governor:
The air inlet valve pocket 9 at main valve body 13 two ends, the valve pocket 17 of giving vent to anger are fixedly connected with to go here and there to be loaded on the gas transmission supervisor get final product.
The setting of pressure governor peak rate of flow:
At first require to set the peak rate of flow parameter value according to the pipe network transmission ﹠ distribution body technique rules of supplying gas, according to fluid mechanics principle calculated flow rate gross data, operation regulate setscrew nut 15 can accurately regulate position that equipped excess on main valve stem 20 closes spool 16 and with the spacing of main valve plug 8, can accurately set primary choke 18 apertures and chromaffin body head piece aperture when satisfying peak rate of flow.Then by following operating and setting peak rate of flow: at first open and press before the air inlet gate valve makes gas transmission supervisor front end gas enter the interior formation of air inlet valve pocket 9 of main valve body 13, the body of calming the anger before in air inlet valve pocket 9 imports in air cavitys 47 through center hole 14, the cross-drilled hole 48 of main valve stem 20 again.slowly tighten the adjusting screw rod 43 of preset command valve and promote lower membrane module 34 downwards by Regulation spring 42 and open commander's throttle orifice, can form the shunting air flue that following air inlet valve pocket 9 by main valve body 13 to the main hypostegal cavity 1 of pressure regulation driving mechanism is connected: the body of calming the anger before in air inlet valve pocket 9 enters lower epistege 31 through the inlet hole 39 of air cavity 47 and the pore 38 input command valves by connection pipe fitting 4 after by the throttling of commander's throttle orifice, again through air pressure balance duct 29, air outlet hole 30 is by in the front pressure signal tube 5 main hypostegal cavities 1 of input, gas in main hypostegal cavity 1 gently leaks in main epistege 3 after damp tube 44 damping step-downs again, the last valve pocket 17 of giving vent to anger of main valve body 13 of being sent back to by backflow signal tube 23 again.Enter in main hypostegal cavity 1 before the body of calming the anger will upwards promote main film elasticity assembly 24 and upwards mention simultaneously main valve plug 8 and excess is closed spool 16 by main valve stem 20, can make that primary choke 18 is opened into suitable aperture, the chromaffin body head piece is decreased to suitable aperture.At last, carry out the accurate adjustment setting operation according to the pipe network transmission ﹠ distribution technical order that the body technique rules require to set the peak rate of flow parameter value of supplying gas: slowly rotate adjusting screw rod 43 and accurately regulate the aperture of commander's throttle orifice and then fine adjustment and set pressure in main hypostegal cavity 1, can be with the open degree fine adjustment of primary choke 18 and chromaffin body head piece to satisfying the aperture that sets peak rate of flow.So far, namely complete setting operation to the pressure governor peak rate of flow.
Obviously, as shown in arrow 10, transmission ﹠ distribution the flow through flow of pressure governor of body of supplying gas is flow from the air inlet valve pocket 9 of main valve body 13 to the valve pocket 17 of giving vent to anger, and it is to be carried out the second throttle acting in conjunction and determined by chromaffin body head piece, 18 pairs of air-flows of primary choke successively.The limit threshold state that pressure governor sets peak rate of flow is: the aperture of chromaffin body head piece equates with the aperture of primary choke 18, that is to say the threshold state of gas flow when the flow velocity of primary choke 18 equates with the flow velocity of chromaffin body head piece.In fact, pressure governor internal pressure system when setting the peak rate of flow threshold state just is in a kind of temporary transient metastable state, that is to say, the aperture of setting chromaffin body head piece aperture that commander's throttle orifice aperture determines and primary choke 18 by accurate adjustment is a kind of temporary transient " state of equilibrium " under Regulation spring 42, lower film spring 33, homophony spring 21 and this moment front pressure, rear pressure acting in conjunction just.
Due to above-mentioned " state of equilibrium " of the pressure governor inside relative balance state that is a kind of dynamic instability.Slowly unlatching along with primary choke 18, gas in air inlet valve pocket 9 will be pressed after formation in chromaffin body head piece, primary choke 18 enter the valve pocket 17 of giving vent to anger and gradually, rear pressure signal tube 11 can after the body of calming the anger import in the lower hypostegal cavity 32 of command valve and promote to move on lower membrane module 34 and reduce to command the aperture of throttle orifice, at this moment, original " state of equilibrium " will be changed.Reducing and can make the gas flow of the shunting air flue of flowing through reduce the pressure that reduces in main hypostegal cavity 1 due to commander's throttle orifice aperture.Meanwhile, backflow signal tube 23 also can with after calm the anger that body imports main epistege 3 and pressure in the main epistege 3 that raises, because main epistege 3 and main hypostegal cavity 1 internal pressure change coefficient result be: will promote main film elasticity assembly 24 and move down and it is reduced or close primary choke 18.At this moment, again be in new " state of equilibrium " under front pressure, rear pressure and Regulation spring 42, the lower film spring 33 that pressure governor again can be at this moment, the common compound action of homophony spring 21, and this new " state of equilibrium " can continue dynamically also to change with the fluctuation of front pressure, rear pressure.
pressure regulation working principle: when the user of gas transmission supervisor rear end begins to increase when making the 17 output end pressures decline of gas outlet valve chamber with gas or with throughput, backflow signal tube 23, rear pressure signal tube 11 can feed back to " pressure drop signal " respectively in main epistege 3 in lower hypostegal cavity 32 with command valve, at this moment, command valve will be regulated raise pressure in main hypostegal cavity 1 of the aperture that increases commander's throttle orifice in time from motion tracking " pressure drop " fluctuation situation, make the aperture of the large primary choke 18 of transposition on main film elasticity assembly 24 come the augmented flow compensation to promote the pressure of output terminal, can realize that automatic Regulation keeps the stable purpose of output end pressure.In like manner, when fluctuation appearred in gas transmission supervisor front end bleed pressure or the output end pressure fluctuation occurs simultaneously, command valve also can regulate and control from the aperture that motion tracking " pressure surge " situation is regulated commander's throttle orifice in time pressure main epistege 3 and main hypostegal cavity 1 in to be regulated the aperture of primary choke 18 and carries out pressure regulation and make output end pressure keep stablizing.
Need to prove: above-mentioned pressure regulation work is carried out in pressure governor sets the peak rate of flow scope, and its voltage-regulation principle is substantially similar to existing pressure governor.
the working principle of super flow autoshutdown: when output flow sharply increases appearance " super flow " event or burst pipe explosion leakage accident, its actual output flow reaches or surpasses and sets peak rate of flow, that is to say: after the aperture that pressure governor is in primary choke 18 equates the limit threshold state of (primary choke 18 equates with the flow velocity of chromaffin body head piece in other words) with the aperture of chromaffin body head piece, pressure in the valve pocket 17 of giving vent to anger of main valve body 13 can descend and make also fast-descending thereupon of pressure in the lower hypostegal cavity 32 of main epistege 3 and command valve, at this moment, commander's throttle orifice will be opened into maximum opening and pressure continuation main hypostegal cavity 1 in be raise and promote main film elasticity assembly 24 and move on continuing rapidly under front pressure effect, can drive that excess close that spool 16 and main valve plug 8 move on continuing and after crossing fast the limit threshold state of " primary choke 18 apertures equate with chromaffin body head piece aperture " when setting peak rate of flow by main valve stem 20: the aperture of chromaffin body head piece will be less than the aperture of primary choke 18 (in other words, the flow velocity of primary choke 18 will be less than the flow velocity of chromaffin body head piece), the gas flow that enters the valve pocket 17 of giving vent to anger from the air inlet valve pocket 9 of main valve body 13 will fast-descending, reduce further the interior pressure of lower hypostegal cavity 32 of main epistege 3 and command valve, making main valve stem 20 can drive more rapidly excess closes and moves sealing valve port seat 12 lower end surfaces on spool 16, can realize that quick closedown chromaffin body head piece cuts off the purpose that source of the gas carries out safety protection to the pipe network equipment system.
The pressure governor that the peak rate of flow that the present invention proposes can be set super flow autoshutdown shows through practical probation detection repeatedly: when the gas line network system moves in setting the peak rate of flow scope; has good voltage-regulation voltage-stabilization performance; when sharply increasing to surpass, actual flow sets peak rate of flow; when namely " super flow " anomalous event (as the pipe explosion leakage accident) occurring; pressure governor all can quick closedown cut off source of the gas in 1.5 seconds; further expanding of Accident prevention, have splendid safety protection performance effectively.
Claims (5)
1. a peak rate of flow can be set the pressure governor of super flow autoshutdown, it comprises pressure regulation actuator, pressure regulation driving mechanism and by valve body (6), valve seat (35), valve gap (41), the command valve that adjusting screw rod (43) consists of, said pressure regulation actuator is by main valve body (13), be fitted to the valve port seat (12) in main valve body (13), valve pocket (19), main valve plug (8), homophony spring (21) and main valve stem (20) consist of, the main valve plug (8) that is connected in main valve stem (20) is fitted in valve pocket (19) and forms primary choke (18) with valve port seat (12) upper-end surface, said pressure regulation driving mechanism is by the main bellows seat (2) that is installed on main valve body (13) upper-end surface, main bellows lid (25) and main film elasticity assembly (24) consist of, it is main epistege (3) that main film elasticity assembly (24) is separated main bellows, main hypostegal cavity (1), the backflow signal tube (23) that is installed on main bellows lid (25) is connected with the valve pocket of giving vent to anger (17) of main valve body (13), main valve stem (20) top is connected in main film elasticity assembly (24), it is characterized in that: close spool (16) and valve port seat (12) lower end surface formation chromaffin body head piece in main valve stem (20) bottom installation excess, main valve stem (20) is provided with center hole (14) and is communicated with the cross-drilled hole (48) of center hole (14) and air cavity (47), be provided with the delivery outlet (7) that is communicated with air cavity (47) in main bellows seat (2) diapire, main film elasticity assembly (24) is fitted with damp tube (44), equipped lower membrane module (34) is divided into lower epistege (31) between the valve body (6) of command valve and valve seat (35), lower hypostegal cavity (32), be fitted with the lower film spring (33) of membrane module (34) under supporting in valve seat (35), hypostegal cavity (28) on equipped upper membrane module (27) formation between the valve body (6) of command valve and valve gap (41), be fitted with the Regulation spring (42) of the upper membrane module (27) of supporting in valve gap (41), the upper axle head that is fitted to the regulation and control slide-bar (40) in valve body (6) is connected in membrane module (27), the lower shaft end of regulation and control slide-bars (40) is connected in lower membrane module (34), be provided with the inlet hole (39) that communicates with lower epistege (31) in valve body (6), hypostegal cavity in connection (28), the air pressure balance duct (29) of lower epistege (31) and be communicated in the air outlet hole (30) of air pressure balance duct (29), fixedly mount connection pipe fitting (4) between the delivery outlet (7) of the inlet hole (39) of valve body (6) and main bellows seat (2), the front pressure signal tube (5) that is installed on main bellows seat (2) is connected with the air outlet hole (30) of valve body (6), the rear pressure signal tube (11) that is installed on valve seat (35) is connected with the valve pocket of giving vent to anger (17) of main valve body (13).
2. peak rate of flow according to claim 1 can be set the pressure governor of super flow autoshutdown, it is characterized in that: the inlet hole (39) in valve body (6) position that communicates with lower epistege (31) is fitted with valve (37) and consists of commander's throttle orifice, is embedded with the sealing gasket (36) that adapts with valve (37) in the upper-end surface of lower membrane module (34).
3. peak rate of flow according to claim 1 and 2 can be set the pressure governor of super flow autoshutdown, it is characterized in that: also be fitted with the spring seat (26) of supporting Regulation spring (42) in valve gap (41), adjusting screw rod (43) termination overhead is in spring seat (26) central position, upper-end surface.
4. peak rate of flow according to claim 1 and 2 can be set the pressure governor of super flow autoshutdown, it is characterized in that: damp tube (44) front end is provided with the damping mouth (46) that communicates with damping hole (45).
5. peak rate of flow according to claim 1 and 2 can be set the pressure governor of super flow autoshutdown, it is characterized in that: the equipped sealing cover (22) in interior diapire face position that is through at main bellows seat (2) at main valve stem (20).
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| CN201210193924.9A CN102705552B (en) | 2012-06-13 | 2012-06-13 | Pressure regulator with excessive flow auto-closing function by setting maximum flow |
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| CN102705552B true CN102705552B (en) | 2013-11-06 |
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| CN104358904B (en) * | 2014-11-25 | 2016-09-28 | 四川长仪油气集输设备股份有限公司 | Diaphragm type control valve |
| CN104482283B (en) * | 2014-12-12 | 2017-01-25 | 乐山川天燃气输配设备有限公司 | Upstream under-pressure automatic closing pressure regulator |
| CN107289166A (en) * | 2017-08-16 | 2017-10-24 | 宁波艾迪西国际贸易有限公司 | A kind of shutoff valve |
| DE202017105426U1 (en) | 2017-09-07 | 2018-12-10 | Neoperl Gmbh | valve assembly |
| CN115111413A (en) * | 2022-06-28 | 2022-09-27 | 沈阳航天新光集团有限公司 | Small-size electric explosion relief pressure valve |
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