CN102705552A - 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 that ultra flow is closed automatically; It is particularly suitable for sending in transmission & distribution on the pipeline of inflammable toxic gases such as combustion gas, coal gas and installs and uses, and can set peak rate of flow easily and can when the burst pipeline burst causes ultra flow leakage accident, carry out safety protection by the quick closedown source of the gas.
Background technique
Along with the high speed development of China's Petrochemical, the city is civilian to provide abundant combustion gas resource with commercial production in order to satisfy, and combustion gas is distributed to numerous users realizes by blazoning huge gas pipeline system.It is to adopt special-purpose pipe network equipment that source of the gas is handled the stable combustion gas of rear line delivery pressure through the voltage stabilizing of pressure regulation peak regulation to supply to use.We know: distribution pressure and flow are two important technology indexs of gas line network system design and safe operation; That is to say:, will in the peak rate of flow scope that sets, export the stable combustion gas of rated pressure exactly and supply user security to use for guaranteeing the purpose of pipe network equipment technical measures that system safety operation is taked.To be objective; Pressure surge takes place in the interference that in actual motion, can receive factors such as source of the gas situation, ambient temperature, humidity owing to the pipe network equipment system unavoidably; When the pressure surge amplitude surpasses permitted value more greatly; Will influence the pipe network system transmission & distribution and send the workmanship of combustion gas, also cause equipment accident when serious easily.Be improving Safety performance and the delivery of fuel gas quality of pipe network equipment, mostly is to be employed in gas transmission to be responsible for to go up and pressure governor is installed is regulated and control air pressure fluctuation and output pressure is tended towards stability.The 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 will being responsible for signal tube again imports the homophony bellows and acts on diaphragm unit; Make diaphragm unit move up and down, also drive the open degree that primary valve is regulated in the spool displacement through valve rod from motion tracking pressure surge situation; That is to say: when output pressure exceeds that the rated pressure undulating value that sets continues to raise or when reducing, spool moves down thereupon or goes up that in-migration reduces or the open degree that increases primary valve is carried out pressure regulation, can realize the stable pressure regulation purpose of output pressure maintenance.Though the voltage-regulating technique of existing pressure governor is quite ripe and in pipe network system, have a use experience for many years; But; Need not to dare not or would not speak up, still there is the technical pattern property defective that function of use is single, Safety performance is relatively poor in existing pressure governor: in general, it can only merely regulate and control stable output pressure; But can't set, more can not when " ultra flow " anomalous event (as: burst pipe explosion leakage accident) takes place, close source of the gas automatically peak rate of flow.In fact; The gas line network that spreads all over town and country at present is in the running of going through for many years, owing to " ultra flow " leakage accident that receives pipeline outmoded influence aging, many factors such as geology is subsided, extreme weather disaster and artificial construction initiation booster to split pipe also happens occasionally.Up to now, the pressure governor of existing use is not possess protective function for this " ultra flow " disappointing accident.Further expanding that total air lock valve could prevention accident effectively closed in the back manual work that only remains to be received a crime report.This is that existing pressure governor also needs further to improve perfect place, and this is petrochemical industry department and the gas company technical problem of always hoping solution for many years just also.
Summary of the invention
The object of the invention is intended to overcome the above-mentioned deficiency that existing technology exists and proposes a kind of peak rate of flow and can set the pressure governor that ultra flow is closed automatically.
The objective of the invention is to realize through following technological scheme:
A kind of peak rate of flow can be set the pressure governor that ultra flow is closed automatically; It comprises pressure regulation actuator, pressure regulation driving mechanism and the command valve that is made up of valve body, valve seat, valve gap, adjusting screw rod; Said pressure regulation actuator is made up of main valve body, the valve port seat, valve pocket, main valve plug, homophony spring and the main valve stem that are fitted in the main valve body; The main valve plug that is connected in main valve stem is fitted in the valve pocket and with valve port seat upper-end surface and forms primary choke; Said pressure regulation driving mechanism constitutes by being installed on the main bellows seat of main valve body upper-end surface, main bellows lid and main film elasticity assembly; It is main epistege, main hypostegal cavity that main film elasticity assembly is separated main bellows, and 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, and the main valve stem top is connected in main film elasticity assembly; It is characterized in that: excess is installed in the main valve stem bottom closes spool and valve port seat lower end surface formation chromaffin body head piece; Main valve stem is provided with center hole and the cross-drilled hole that is communicated with center hole and air cavity, in main bellows seat diapire, is provided with the delivery outlet that is communicated with air cavity, and main film elasticity assembly is fitted with damp tube; Equipped membrane module down is divided into down epistege, hypostegal cavity down between the valve body of command valve and valve seat; In valve seat, be fitted with the down following film spring of membrane module of supporting, hypostegal cavity on the membrane module formation on equipped between the valve body of command valve and the valve gap is fitted with the Regulation spring of membrane module in the supporting in valve gap; The last axle head that is fitted to the regulation and control slide-bar in the valve body is connected in membrane module; The lower shaft end of regulation and control slide-bar is connected in play membrane module, in valve body, is provided with the air pressure balance duct of hypostegal cavity in the inlet hole that communicates with following epistege, the connection, time epistege and is communicated in the air outlet hole of air pressure balance duct, between the delivery outlet of the inlet hole of valve body and main bellows seat, fixedly mounts connection pipe fitting; The preceding pressure signal tube that is installed on main bellows seat is connected with the air outlet hole of valve body, and the back pressure signal tube that is installed on valve seat is connected with the valve pocket of giving vent to anger of main valve body.
Say that further the present invention also has following technical characteristics:
Be fitted with valve and constitute commander's throttle orifice in the inlet hole of the valve body position that communicates with following epistege, be embedded with the sealing gasket that adapts with valve in the upper-end surface of membrane module down.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 ultra flow all has positive effect.
In valve gap, also be fitted with the spring seat of supporting Regulation spring, 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 the operation that accurate adjustment is set through adjusting screw rod.
The damp tube front end is provided with the damping mouth that communicates with damping hole.The slow effect of letting out of damping step-down that it can effectively improve damp tube improves induction sensitivity and transport velocity to Pressure Fluctuation Signal, can further improve the pressure regulation stability and ultra 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 advantage 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.
It is to carry out work as follows that the peak rate of flow that the present invention proposes can be set the pressure governor that ultra flow closes automatically:
Its original state:
Adjusting screw rod, the Regulation spring of command valve are in relaxed state, and membrane module made sealing gasket sealing valve under the following film spring in the valve seat upwards promoted, 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 then 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 person in charge 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; The spacing that position and main valve plug that excess closes spool, main valve plug and excess are closed spool accurately is installed on the control main valve stem, makes it can accurately regulate primary choke aperture and chromaffin body head piece aperture when setting peak rate of flow.It is to set peak rate of flow as follows: open and press before air inlet gate valve that gas transmission is responsible for is responsible for gas transmission to form in the air inlet valve pocket that front end gas gets into main valve body, the body of calming the anger before in the air inlet valve pocket imports in the 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 also promotes membrane module unlatching commander throttle orifice down downwards through Regulation spring; Can form the shunting air flue that is connected to main hypostegal cavity by the air inlet valve pocket: calm the anger before in the air inlet valve pocket body by the inlet hole of the connection pipe fitting input command valve that is communicated in air cavity and under getting into after the throttling of commander's throttle orifice epistege, get in the main hypostegal cavity by preceding pressure signal tube through air pressure balance duct, air outlet hole again; Gas in the main hypostegal cavity can be entered the valve pocket of giving vent to anger of main valve body by the backflow signal tube after damp tube damping step-down slowly leaks into main epistege.At this moment, get in the main hypostegal cavity before calm the anger to know from experience and upwards promote main film elasticity assembly and upwards mention main valve plug primary choke is opened into suitable aperture through main valve stem, 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 adjusting screw rod and accurately regulate the aperture of commander's throttle orifice and then accurately regulate the pressure of setting in the main hypostegal cavity; Can the open degree of primary choke and chromaffin body head piece accurately be adjusted to and satisfy the aperture that sets peak rate of flow, promptly accomplish setting operation the pressure governor peak rate of flow.
Obviously, the flow from air inlet valve pocket to the valve pocket of giving vent to anger of main valve body 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 stream 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 that the primary choke aperture and the chromaffin body head piece aperture that are determined by accurate adjustment setting commander throttle orifice aperture are in Regulation spring, following film spring, homophony spring and a kind of metastable " state of equilibrium " under pressure, the back pressure acting in conjunction before this moment.
Inner " state of equilibrium " of pressure governor is a kind of transient equilibrium state of dynamic instability.Slowly unlatching along with primary choke; Gas in the air inlet valve pocket can get in the valve pocket of giving vent to anger through chromaffin body head piece, primary choke successively and little by little press after the formation; The back press signal tube again can with after the body of calming the anger import in the following hypostegal cavity of command valve and promote to move on the membrane module down 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 and reduces the interior pressure of main hypostegal cavity.Meanwhile; The backflow signal tube also can with after calm the anger that body imports main epistege and pressure in the main epistege that raises, change coefficient result by main epistege and main hypostegal cavity internal pressure: will promote main film elasticity assembly and move down and it is reduced or close primary choke.At this moment, preceding pressure, back pressure and the Regulation spring that pressure governor again can be at this moment, be in new temporary transient " state of equilibrium " once more under the common compound action of film spring, homophony spring down.
The working principle of automatic Regulation:
The user who is responsible for the rear end when gas transmission begins to increase when making gas outlet valve chamber output end pressure decline occur with gas or with throughput; Backflow signal tube, back press signal tube can be respectively will " pressure drop signal " feed back in the main epistege and in the following hypostegal cavity of command valve; Command valve can be regulated the aperture that the increases commander's throttle orifice pressure in the main hypostegal cavity that raises in time from motion tracking " pressure drop " fluctuation situation; Promote the big primary choke aperture of transposition on the main film elasticity assembly and come 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 is responsible for front end bleed pressure appearance fluctuation or is occurred the output end pressure fluctuation simultaneously; Command valve also can be regulated the pressure main epistege and main hypostegal cavity in from the aperture that motion tracking " pressure surge " situation regulated commander's throttle orifice in time, and then carries out pressure regulation through 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 similar basically with existing pressure governor.
The working principle that ultra flow is closed automatically:
When output flow sharply increases appearance " ultra flow " incident or the pipe explosion leakage accident that happens suddenly; 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; Pressure in the valve pocket of giving vent to anger of main valve body can descend fast and the interior pressure of following hypostegal cavity of main epistege and command valve is also descended thereupon fast; At this moment; Commander's throttle orifice will be opened into maximum opening under preceding pressure effect; Make pressure in the main hypostegal cavity continue to raise and promote main film elasticity assembly and move on continuing apace, can drive that excess closes that spool moves on continuing with main valve plug and after crossing the limit threshold state of " the primary choke aperture equates with chromaffin body head piece aperture " when setting peak rate of flow fast:, will descend fast from the give vent to anger gas flow of valve pocket of the air inlet valve pocket entering of main valve body owing to 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 through main valve stem; Further reduce the interior pressure of following hypostegal cavity of main epistege and command valve; At this moment, main valve stem will be more apace drive excess closes spool and moves sealing valve port seat lower end surface on continuing, and quick closedown chromaffin body head piece cuts off source of the gas; Can prevent effectively that accident from further expanding, the pipe network equipment system is had splendid safety protection performance.
The present invention has following outstanding substantive distinguishing features and remarkable progress:
The present invention has initiated main valve plug has been installed on the main valve stem, excess is closed spool and formed major and minor restriction " the second throttle structure that is associated "; Command valve can be regulated the stream condition in commander's throttle orifice control shunting air flue and it is acted on main film elasticity assembly according to " preceding pressure ", " then press " fluctuation signal automatically; Drive the related aperture of regulating major and minor restriction of main valve stem upper and lower displacement by main film elasticity assembly and carry out voltage-regulation voltage-stabilization; Its significant technical pattern characteristic also is: it can set the peak rate of flow of pressure governor; When " ultra flow " anomalous event (as: burst pipe explosion leakage accident) takes place, can close source of the gas apace and carry out safety protection.The present invention have modern design, rational in infrastructure, regulate that setting operation is convenient, pressure regulation precision high voltage stability performance is good and the strong outstanding advantage of " ultra flow " safety protection performance.
Description of drawings:
Fig. 1 is a 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 the main film elasticity assembly.
Fig. 4 is the III partial enlarged drawing of Fig. 1, shows that main valve stem is provided with the structural representation of center hole and cross-drilled hole.
Description of symbols in the accompanying drawing:
1 is main hypostegal cavity; 2 is main bellows seat; 3 is main epistege; 4 is connection pipe fitting; 5 is preceding 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 that signal tube is pressed in the back; 12 is the valve port seat; 13 is main valve body; 14 is center hole; 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 last membrane module; 28 is last hypostegal cavity; 29 is air pressure balance duct; 30 is air outlet hole; 31 are following epistege; 32 are following hypostegal cavity; 33 are following film spring; 34 are following 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 that ultra flow is closed automatically, and it mainly presses signal tube 11, backflow signal tube 23 to form by preceding pressure signal tube 5, the back of pressure regulation actuator, pressure regulation driving mechanism, command valve and transport gas pressure signal.Said pressure regulation actuator is made up 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 the main valve body 13, and the main valve plug 8 that is connected in main valve stem 20 is fitted in the valve pocket 19 and with valve port seat 12 upper-end surfaces and forms primary choke 18.Said pressure regulation driving mechanism constitutes by being installed on the main bellows seat 2 of main valve body 13 upper-end surfaces, main bellows lid 25 and main film elasticity assembly 24; Main bellows seat 2, main bellows lid 25 constitute the main bellows of sealing; Being fitted to the main film elasticity assembly 24 of main bellows seat 2 and main bellows lid between 25, to separate main bellows be main epistege 3, main hypostegal cavity 1; On main film elasticity assembly 24, be fitted with damp tube 44; 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, closes spool 16 and forms the chromaffin body head piece, in main valve stem 20, be provided with the cross-drilled hole 48 of center hole 14 and connection air cavity 47 with valve port seat 12 lower end surfaces by regulating excess that setscrew nut 15 location are fitted to main valve stem 20 bottoms; 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, in main bellows seat 2 diapires, be provided with the delivery outlet 7 that is communicated with air cavity 47.Said command valve by valve body 6, valve seat 35, down membrane module 34, valve gap 41, go up membrane module 27, adjusting screw rod 43 and the sliding regulation and control slide-bars 40 that are assigned in the valve body 6 and constitute; Following membrane module 34 is fitted to and is divided into epistege 31, following hypostegal cavity 32 down between valve seat 35 and the valve body 6; In valve seat 35, be fitted with the following film spring 33 of membrane module 34 under the supporting; Be equipped with hypostegal cavity 28 in membrane module 27 formation between valve body 6 and the valve gap 41; In valve gap 41, be fitted with Regulation spring 42, the spring seat 26 of membrane module 27 in the supporting; Adjusting screw rod 43 termination overheads are in central position, spring seat 26 upper-end surface; The last axle head of regulation and control slide-bar 40 is fixedly connected on membrane module 27, and the lower shaft end of regulating and control slide-bar 40 is fixedly connected on down membrane module 34, in valve body 6, is provided with the air pressure balance duct 29 of hypostegal cavity 28, time epistege 31 in the inlet hole 39 that communicates with following epistege 31, the connection and is communicated in the air outlet hole 30 of air pressure balance duct 29; Be fitted with valve 37 and constitute commander's throttle orifices in the inlet hole 39 of valve body 6 position that communicates with following epistege 31; Be embedded with the sealing gasket 36 that adapts with valve 37 in the following upper-end surface of membrane module 34, between the delivery outlet 7 of the inlet hole 39 of valve body 6 and main bellows seat 2, fixedly mount connection pipe fitting 4, the preceding 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, and the back 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 work as follows:
The original state of pressure governor:
The adjusting screw rod 43 of command valve is in relaxed state with Regulation spring 42, and the following film springs 33 in the valve seat 35 upwards promote down membrane module 34 and make 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 plugs 8 sealing valve port seats 12 upper-end surfaces downwards, that is to say: primary choke 18 be close, the chromaffin body head piece then 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 fixed connection strings of giving vent to anger are loaded on the gas transmission person in charge and upward 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; Operating regulation setscrew nut 15 can accurately regulate on the main valve stem 20 position that equipped excess closes spool 16 and with the spacing of main valve plug 8, make it 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 is responsible for gas transmission to form in the air inlet valve pocket 9 that front end gas gets into main valve body 13, the body of calming the anger before in the air inlet valve pocket 9 imports in the 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 open commander's throttle orifice through membrane module 34 under Regulation spring 42 promotion downwards; Can form as follows the shunting air flue that the main hypostegal cavity 1 by air inlet valve pocket 9 to the pressure regulation driving mechanism of main valve body 13 is connected: calm the anger before in the air inlet valve pocket 9 body through the inlet hole 39 of air cavity 47 and the pore 38 input command valves through connection pipe fitting 4 get into after by the throttling of commander's throttle orifice down epistege 31, again through air pressure balance duct 29, air outlet hole 30 by the main hypostegal cavity 1 of preceding pressure signal tube 5 inputs in; Gas in the main hypostegal cavity 1 gently leaks in the main epistege 3 after damp tube 44 damping step-downs again, is sent back to the valve pocket 17 of giving vent to anger of main valve body 13 at last again by backflow signal tube 23.Get in the main hypostegal cavity 1 before the body of calming the anger will upwards promote main film elasticity assembly 24 and upwards mention main valve plug 8 simultaneously and excess is closed spool 16 through 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 regulates the aperture of commander's throttle orifice and then accurately regulate the pressure of setting in the main hypostegal cavity 1, can the open degree of primary choke 18 and chromaffin body head piece accurately be adjusted to the satisfied aperture that sets peak rate of flow.So far, promptly accomplish 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 from the flow of air inlet valve pocket 9 to the valve pocket 17 of giving vent to anger of main valve body 13, 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 stream 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 determined and primary choke 18 by accurate adjustment just Regulation spring 42, down film spring 33, homophony spring 21 and pressed before this moment, a kind of temporarily " state of equilibrium " under the pressure acting in conjunction of back.
Because the relative balance state that inner above-mentioned " state of equilibrium " of pressure governor is a kind of dynamic instability.Slowly unlatching along with primary choke 18; Gas in the air inlet valve pocket 9 will be pressed after chromaffin body head piece, primary choke 18 get in the valve pocket 17 of giving vent to anger and form gradually; The back press signal tube 11 can with after the body of calming the anger import in the following hypostegal cavity 32 of command valve and promote to move on the membrane module 34 down 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 the main hypostegal cavity 1 owing 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 changes coefficient result with main hypostegal cavity 1 internal pressure be: will promote main film elasticity assembly 24 and move down and it is reduced or close primary choke 18.At this moment; Pressure governor again can be at this moment preceding pressure, the back is pressed and Regulation spring 42, be in new " state of equilibrium " once more under the common compound action of film spring 33, homophony spring 21 down, and this new " state of equilibrium " also can dynamically continue to change with the fluctuation that press preceding pressure, back.
The pressure regulation working principle: the user who is responsible for the rear end when gas transmission 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, back press signal tube 11 can be respectively will " pressure drop signal " feed back in the main epistege 3 and in the following hypostegal cavity 32 of command valve; At this moment; Command valve will be regulated the aperture that the increases commander's throttle orifice pressure in the main hypostegal cavity 1 that raises in time from motion tracking " pressure drop " fluctuation situation; Make the aperture of the big primary choke 18 of transposition on the 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 gas transmission was responsible for the front end bleed pressure and fluctuation is occurred or occur the output end pressure fluctuation simultaneously, command valve also can be regulated and control main epistege 3 and the pressure in the main hypostegal cavity 1 from the aperture that motion tracking " pressure surge " situation is regulated commander's throttle orifice in time and regulate the aperture of primary choke 18 and carry 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 similar basically with existing pressure governor.
The working principle that ultra flow is closed automatically: when output flow sharply increases appearance " ultra flow " incident or happens suddenly the 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 the following hypostegal cavity 32 interior pressure of main epistege 3 and command valve is also descended thereupon fast; At this moment; Commander's throttle orifice will be opened into maximum opening and make pressure main hypostegal cavity 1 in continue rising and promote main film elasticity assembly 24 and move on continuing apace under preceding pressure effect; Can drive that excess close that spool 16 moves on continuing with main valve plug 8 and after crossing the limit threshold state of " primary choke 18 apertures equate with chromaffin body head piece aperture " when setting peak rate of flow fast 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 gets into the valve pocket 17 of giving vent to anger from the air inlet valve pocket of main valve body 13 9 will descend fast; Reduce the pressure in the following hypostegal cavity 32 of main epistege 3 and command valve further, make main valve stem 20 can drive excess more apace and close and move sealing valve port seat 12 lower end surfaces on the spool 16, can realize that quick closedown chromaffin body head piece cuts off source of the gas carries out safety protection to the pipe network equipment system purpose.
The peak rate of flow that the present invention proposes can be set pressure governor that ultra flow closes automatically and show 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 promptly " ultra flow " anomalous event (like the pipe explosion leakage accident) occurring; Pressure governor all can quick closedown cut off source of the gas in 1.5 seconds, can prevent further expanding of accident effectively, had splendid safety protection performance.
Claims (5)
1. a peak rate of flow can be set the pressure governor that ultra flow is closed automatically; It comprises pressure regulation actuator, pressure regulation driving mechanism and the command valve that is made up of valve body (6), valve seat (35), valve gap (41), adjusting screw rod (43); Said pressure regulation actuator by main valve body (13), be fitted to valve port seat (12), valve pocket (19), main valve plug (8), homophony spring (21) and main valve stem (20) formation in the main valve body (13); The main valve plug (8) that is connected in main valve stem (20) is fitted in the valve pocket (19) and with valve port seat (12) upper-end surface and forms primary choke (18); Said pressure regulation driving mechanism is made up of 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); It is main epistege (3), main hypostegal cavity (1) that main film elasticity assembly (24) is separated main bellows; 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: excess is installed in main valve stem (20) bottom closes spool (16) and valve port seat (12) lower end surface formation chromaffin body head piece; 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); In main bellows seat (2) diapire, be provided with the delivery outlet (7) that is communicated with air cavity (47); Main film elasticity assembly (24) is fitted with damp tube (44); Equipped membrane module (34) down is divided into down epistege (31), hypostegal cavity (32) down between the valve body (6) of command valve and valve seat (35); In valve seat (35), be fitted with the following film spring (33) of membrane module (34) under the supporting; Go up hypostegal cavity (28) on membrane module (27) formation equipped between the valve body (6) of command valve and the valve gap (41); In valve gap (41), be fitted with supporting and go up the Regulation spring (42) of membrane module (27), the last axle head that is fitted to the regulation and control slide-bar (40) in the valve body (6) is connected in membrane module (27), and the lower shaft end of regulation and control slide-bars (40) is connected in down membrane module (34); In valve body (6), be provided with hypostegal cavity (28) in the inlet hole (39) that communicates with following epistege (31), the connection, down epistege (31) air pressure balance duct (29) and be communicated in the air outlet hole (30) of air pressure balance duct (29); Between the delivery outlet (7) of the inlet hole (39) of valve body (6) and main bellows seat (2), fixedly mount connection pipe fitting (4), the preceding pressure signal tube (5) that is installed on main bellows seat (2) is connected with the air outlet hole (30) of valve body (6), and the back 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 that ultra flow is closed automatically; It is characterized in that: the position that communicates with following epistege (31) of the inlet hole (39) in valve body (6) is fitted with valve (37) and constitutes commander's throttle orifice, is embedded with the sealing gasket (36) that adapts with valve (37) in the upper-end surface of membrane module (34) down.
3. peak rate of flow according to claim 1 and 2 can be set the pressure governor that ultra flow is closed automatically; It is characterized in that: in valve gap (41), also be fitted with the spring seat (26) of supporting Regulation spring (42), 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 that ultra flow is closed automatically, 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 that ultra flow is closed automatically, 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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| 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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| CN104358904A (en) * | 2014-11-25 | 2015-02-18 | 四川长仪油气集输设备股份有限公司 | Diaphragm type control valve |
| CN104482283A (en) * | 2014-12-12 | 2015-04-01 | 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 |
| EP3679282B1 (en) | 2017-09-07 | 2022-01-26 | Neoperl GmbH | Valve arrangement |
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| CN102705552B (en) | 2013-11-06 |
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