CN103075536A - Low-temperature ball valve and control system thereof - Google Patents
Low-temperature ball valve and control system thereof Download PDFInfo
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- CN103075536A CN103075536A CN2013100317144A CN201310031714A CN103075536A CN 103075536 A CN103075536 A CN 103075536A CN 2013100317144 A CN2013100317144 A CN 2013100317144A CN 201310031714 A CN201310031714 A CN 201310031714A CN 103075536 A CN103075536 A CN 103075536A
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Abstract
The invention discloses a low-temperature ball valve, which comprises a valve body, a valve cap, valve seat assemblies, a ball body, a valve rod and a stationary shaft, wherein the valve body and the valve cap are respectively provided with a runner; the valve body and the valve cap are connected by a gasket, a stud and a nut; the ball body is arranged in the valve body; and two sides of the ball body are respectively provided with one valve seat assembly respectively connected with the insides of the valve body and the valve cap. The low-temperature ball valve is further provided with a driving device, wherein the driving device is connected with the upper part of the valve rod by a key, and the lower end of the valve rod is connected with the ball body. According to the low-temperature ball valve disclosed by the invention, a welding line for connecting the valve body and the valve seat adopts a full-automatic welding technology, and the valve body and the valve seat adopt the U-shaped welding line so as to eliminate a leaking point in the welding line for the valve body and the valve seat. The valve sealing surface adopts Stellite hard alloy, the surface is formed by rolling, and the service life of the valve is prolonged. The sealing surface adopts automatic grinding, and the goodness fit of the sealing surface is improved.
Description
Technical field
The present invention relates to the machinery valve technical field, particularly a kind of cryogenic ball valve and control system thereof.
Background technique
Along with the throughput increasing of the industries such as oil, petrochemical industry, electric power, metallurgy, the valve products of being badly in need of a kind of high-performance, high parameter substitutes original old product, guarantees output, increases work efficiency.
As the control valve of Pipeline transport, owing to containing the particulate species solid sundries in the medium, the reason that occurs at first is that the valve seal wear resistance is relatively poor, and sealing surface easily damages, and valve body, the not weld penetration of valve seat weld seam cause welding seam leakage and even perforation.Along with the valve technology is updated, high performance material and automation equipment occur, and cause the old product competitive ability of withdrawing from the market gradually.
Summary of the invention
Ball valve of the present invention is by rotation hand wheel, and the rotation valve rod nut makes the valve rod lifting drive flashboard and makes traveling priority along the perpendicular media direction, reaches the purpose of opening and closing.This product is mainly used in making opening/closing device on gas, the liquid medium pipeline, connects or block MEDIA FLOW, has flow resistance little, opens and closes the advantages such as laborsaving.The hard seal wear-resistant gate valve of wedge-type of the present invention, be different from traditional gate valve product, at valve seat and flashboard sealing surface surface overlaying department alloy too, roll forming is adopted on the surface, adopts Flexible disc, suitably reduce the elasticity ratio, set up lacing wire in flashboard T word groove one side, suitably strengthen guiding groove length, reduce the gap between valve body guiding rib and flashboard guiding groove, stem surface adopts roll forming, and adopts surface carburization to process.Improve valve working life and sealing.
For solving the problems of the technologies described above, the invention provides a kind of cryogenic ball valve, comprise valve body, valve gap, valve component, spheroid, valve rod and stationary axle.
Described valve body, valve gap respectively have runner, and valve body, valve gap connect by pad, double-screw bolt, nut.
Described spheroid places in the valve body, and two sides of described spheroid respectively are provided with a valve component, and links to each other with the inside of described valve body, described valve gap respectively.
Described cryogenic ball valve further is provided with drive unit, and described drive unit links to each other by key with described valve rod top, and described valve rod lower end is connected with described spheroid.
Described spheroid top and bottom surface, valve rod contact position are arc shaped surface, and both sides are the plane of respective parallel, and described spheroid bottom links to each other with stationary axle, radial bearing, plane bearing by cylindrical hole, and are provided with the spring of antistatic in the bottom surface.
For solving the problems of the technologies described above, the present invention also provides a kind of control system of as above each described cryogenic ball valve, comprising: main control module, energy supply control module, power supply, valve position signal module, the I/O module, pressure transducer, temperature transducer, display modular, A/D module, valve control module, the valve events control circuit, communication module, bluetooth module, wireless module, and serial ports turns the USB module.
Described main control module, with described I/O module, communication module, valve control module links to each other, and is used for the described control system of whole control;
Described energy supply control module links to each other with described power supply with described I/O module, is used for controlling the power supply of described power supply;
Described power supply links to each other with described energy supply control module, is used to described control system power supply;
Described valve position signal module links to each other with described I/O module, is used for carrying valve position signal to described I/O module;
Described I/O module, respectively with described valve position signal module, energy supply control module, the A/D module, main control module links to each other, and is used for the input output of baseband signal information;
Described pressure transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the pressure of the pipeline that links to each other with cryogenic ball valve, and the aforementioned pressure signal is transferred to described A/D module;
Described temperature transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the temperature of the pipeline that links to each other with cryogenic ball valve, and the aforementioned temperature signal is transferred to described A/D module;
Described display modular links to each other with described A/D module, for the temperature and pressure of the pipeline that shows cryogenic ball valve or link to each other with cryogenic ball valve;
Described A/D module, respectively with described I/O module, pressure transducer, temperature transducer, display modular links to each other; Be used for pressure transducer, the signal of temperature transducer transmission carries out A/D or D/A conversion; And the information after will changing is communicated by letter with display modular with the I/O module;
Described valve control module links to each other with the valve events control circuit with described main control module respectively; Be used for and control the described control circuit that starts to do according to the instruction that described main control module sends, and send the signal that described valve events control circuit is passed back back to described governor circuit;
Described valve events control circuit links to each other with described valve control module, is used for controlling valve closing according to the instruction of its conveying, opens, and perhaps stops valve;
Described communication module, with described main control module, bluetooth module, wireless module links to each other, and is used for self or wireless data communication;
Described bluetooth module links to each other with described communication module, is used for self communication of described control system;
Described wireless module links to each other with described communication module, is used for the wireless telecommunications of described control system and outside;
Described serial ports turns the USB module, links to each other with described communication module, is used for the mutual conversion of serial data and usb data.
Described pressure transducer input pressure signal; Described temperature transducer input temp signal; Described display modular has the vapour-liquid valve state-indicating function; The vapour-liquid valve state of described control system comprises: gas-oil valve reach position indication, gas-oil valve close put in place indication, gas-oil valve on the spot/remote status, control system explosion-proof door state.
Described main control module receives from the I/O module, valve position state, state of alarm and the test mode of the gas-liquid actuator that valve control module is uploaded; Described main control module accept from control centre open and close, stop three kinds of remote operation orders.Control system can be carried out at any time open and close, stop three kinds of operations according to the order of control centre.
The described valve of opening is operating as:
Open the valve condition: what control system was received control centre opens the valve order, opens the valve location switch not closed;
Open valve output: control system is put out valve output effectively, puts that to close valve output invalid;
Driving valve stops: opening the valve location switch closed, or receive new stopping valve or close the valve order;
Described pass valve is operating as:
Close the valve condition: control system is received the pass valve order at center, and pass valve location switch is not closed;
Control system is put and is closed valve output effectively, puts out valve output invalid;
Close the valve location switch closed, or receive new stopping valve or open the valve order;
The described valve that stops is operating as:
It is invalid that control system is put out valve output, puts that to close valve output invalid.
For solving the problems of the technologies described above, the present invention also provides a kind of ball valve, comprising: valve body, valve gap, valve component, spheroid, valve rod, spring, stationary axle, long-neck support and ceiling hold.
Described ball valve further is provided with drive unit.
Described valve body, valve gap respectively have runner; Valve body, valve gap connect by pad, double-screw bolt, nut; Spheroid places in the valve body, two sides of spheroid respectively are equipped with a valve component, and link to each other with the inside of valve body, valve gap respectively, drive unit links to each other by key with valve rod top, the valve rod lower end is connected with spheroid, drive unit rotates valve rod, spheroid is rotated around axis, realizes 90 ° of unlatchings of valve, closes.
Described seat ring external diameter adopts three grades of steps, adopts the combination seal form of fire-protection ring and lip-type packing, back-up ring.
Described valve body and valve gap, between valve body and support, valve body lower end is connected with tongue-and-groove with stationary axle, uses little surface of contact between valve body and the valve gap, and there is little gap the outside, increases distortion, prevents that medium from leaking outside.
For solving the problems of the technologies described above, the present invention also provides a kind of controlling method of as above each described ball valve, may further comprise the steps:
The first step: the main control module of ball valve control system sends sign on;
Second step: temperature transducer passes through respectively the A/D module with the temperature signal that collects, and signal conversion and the conduction of I/O module report main control module with the temperature signal after processing;
The 3rd step: pressure transducer passes through respectively the A/D module with the pressure signal that collects, and signal conversion and the conduction of I/O module report main control module with the pressure signal after processing;
The 4th step: main control module carries out the rolling average value filtering;
The 5th step: main control module carries out ROD and calculates; Judging whether transfinites; If so, timer starts; Otherwise main control module detects by valve control module whether valve state is intermediate state;
The 6th step: valve state is intermediate state, starts timer, and the warning Processing tasks is started; Otherwise, detect the chamber door state;
The 7th step: the chamber door state is opened, and starts the warning Processing tasks; Otherwise, delayed time one second.
In the described controlling method, control system gathers required pressure, temperature, cell voltage, valve position status data; And whether the main control module of control system need to be monitored these data normal, and the abnormal conditions terminal occurring need to process accordingly according to different situations.
In the described controlling method, control system is with usB interface, Bluetooth function, wireless communication function; USB interface is used for carrying out the setting of parameter and the configuration of some constants; Bluetooth function is used for short-range wireless telecommunications, convenient at ordinary times checking of inspector; Wireless communication function is used for the monitor staff's communication with control centre, occurs unusually can reporting control centre, and control centre also can carry out the Remote operation to the cryogenic ball valve valve chamber by control system of the present invention simultaneously.
In the described controlling method, the control of control system output is a kind of to be that control actuator opens, the closing valve action; Another is the work of control power module.
In the described controlling method, the signals collecting of control system is set to per second and finishes once sampling, and the analog signals of sampling by A/D module inlet opening comprises pipeline pressure AIN0, control system operating ambient temperature AIN4, cell voltage AIN47; The digital switch quantity signal that inlet opening by the I/O module gathers comprises that valve reaches a signal IN00, closes the signal IN01 that puts in place, control system chamber door signal IN02, and valve is long-range, local operation signal IN03.
For solving the problems of the technologies described above, the present invention also provides a kind of wedge-type hard seal wear-resistant gate valve, and described gate valve comprises: valve body, valve seat, flashboard, valve rod, valve gap and drive unit.
Described valve body, valve gap material adopt WCB, and described valve sealing face material adopts cemented carbide, surperficial rolling moulding.
The weld seam that described valve body, valve seat connect adopts the Full-automatic welding method; Described valve body, valve seat adopt U-shaped weld seam.
Described valve sealing face adopts the Si Taili cemented carbide, and roll forming is adopted on the surface, and its hardness can reach HRC45; Sealing surface adopts automatic grinding.
Described gate valve adopts Flexible disc, sets up lacing wire in flashboard T word groove one side, and the guiding groove edge of flashboard is the fillet type; The corner of its upper seal support, Packing seat, filler pressing sleeve is the fillet type; Stem surface adopts roll forming, and adopts surface carburization to process.
For solving the problems of the technologies described above, the present invention also provides the control system of the hard seal wear-resistant gate valve of a kind of as above each described wedge-type, comprising: main control module, energy supply control module, power supply, valve position signal module, the I/O module, pressure transducer, temperature transducer, display modular, A/D module, valve control module, the valve events control circuit, communication module, wireless module, and serial ports turns the USB module.
Described main control module, with described I/O module, communication module, valve control module links to each other, and is used for the described control system of whole control;
Described energy supply control module links to each other with described power supply with described I/O module, is used for controlling the power supply of described power supply;
Described power supply links to each other with described energy supply control module, is used to described control system power supply;
Described valve position signal module links to each other with described I/O module, is used for carrying valve position signal to described I/O module;
Described I/O module, respectively with described valve position signal module, energy supply control module, the A/D module, main control module links to each other, and is used for the input output of baseband signal information;
Described pressure transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the pressure of the pipeline that links to each other with cryogenic ball valve, and the aforementioned pressure signal is transferred to described A/D module;
Described temperature transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the temperature of the pipeline that links to each other with cryogenic ball valve, and the aforementioned temperature signal is transferred to described A/D module;
Described display modular links to each other with described A/D module, for the temperature and pressure of the pipeline that shows cryogenic ball valve or link to each other with cryogenic ball valve;
Described A/D module, respectively with described I/O module, pressure transducer, temperature transducer, display modular links to each other; Be used for pressure transducer, the signal of temperature transducer transmission carries out A/D or D/A conversion; And the information after will changing is communicated by letter with display modular with the I/O module;
Described valve control module links to each other with the valve events control circuit with described main control module respectively; Be used for and control the described control circuit that starts to do according to the instruction that described main control module sends, and send the signal that described valve events control circuit is passed back back to described governor circuit;
Described valve events control circuit links to each other with described valve control module, is used for controlling valve closing according to the instruction of its conveying, opens, and perhaps stops valve;
Described communication module, with described main control module, wireless module links to each other, and is used for self or wireless data communication;
Described wireless module links to each other with described communication module, is used for the wireless telecommunications of described control system and outside;
Described serial ports turns the USB module, links to each other with described communication module, is used for the mutual conversion of serial data and usb data.
Described pressure transducer input pressure signal; Described temperature transducer input temp signal; Described display modular has the vapour-liquid valve state-indicating function; The vapour-liquid valve state of described control system comprises: gas-oil valve reach position indication, gas-oil valve close put in place indication, gas-oil valve on the spot/remote status, control system explosion-proof door state.
Described main control module receives from the I/O module, valve position state, state of alarm and the test mode of the gas-liquid actuator that valve control module is uploaded; Described main control module accept from control centre open and close, stop three kinds of remote operation orders.Control system can be carried out at any time open and close, stop three kinds of operations according to the order of control centre.
The described valve of opening is operating as:
Open the valve condition: what control system was received control centre opens the valve order, opens the valve location switch not closed;
Open valve output: control system is put out valve output effectively, puts that to close valve output invalid;
Driving valve stops: opening the valve location switch closed, or receive new stopping valve or close the valve order;
Described pass valve is operating as:
Close the valve condition: control system is received the pass valve order at center, and pass valve location switch is not closed;
Control system is put and is closed valve output effectively, puts out valve output invalid;
Close the valve location switch closed, or receive new stopping valve or open the valve order;
The described valve that stops is operating as:
It is invalid that control system is put out valve output, puts that to close valve output invalid.
For solving the problems of the technologies described above, the present invention also provides a kind of wear-resistant sluice valve controlling method based on computer system, may further comprise the steps:
The first step: the main control module of gate valve control system sends sign on;
Second step: temperature transducer passes through respectively the A/D module with the temperature signal that collects, and signal conversion and the conduction of I/O module report main control module with the temperature signal after processing;
The 3rd step: pressure transducer passes through respectively the A/D module with the pressure signal that collects, and signal conversion and the conduction of I/O module report main control module with the pressure signal after processing;
The 4th step: main control module carries out the rolling average value filtering;
The 5th step: main control module carries out ROD and calculates; Judging whether transfinites; If so, timer starts; Otherwise main control module detects by valve control module whether valve state is intermediate state;
The 6th step: valve state is intermediate state, starts timer, and the warning Processing tasks is started; Otherwise, detect the chamber door state;
The 7th step: the chamber door state is opened, and starts the warning Processing tasks; Otherwise, delayed time one second.
In the described wear-resistant sluice valve controlling method based on computer system, the filtering method of pressure signal and the step of judge leaking are: be the window of N at data length, ask for arithmetic mean value according to following formula when image data satisfies length of window.
Adopt at this and just to utilize quantity of information filtering that new data provides after the new data and with former data cover, to obtain again the arithmetic mean value of N data in the current buffer area at last.According to new sampled value the filtering result is upgraded, i.e. one of the new collection of survey data just abandons the data that gathered before N time, measures and once just calculates mean value one time, has greatly accelerated the ability that data are processed.N can arrange change.
In the described wear-resistant sluice valve controlling method based on computer system, by the pressure data that the rolling average value filtering obtains, the pressure comparison that needs and front once sampling are calculated calculates the pressure drop speed (RoD) of per second.Consider temperature to the impact of pipeline pressure, by Clapyron Equation:
p·v＝n·R·T
P: pressure, v: rock gas volume, n: amount of substance, T: temperature, R: constant 8.31441
If in the situation that does not occur to leak, ROD is 0.
In the described wear-resistant sluice valve controlling method based on computer system, when occuring to leak, Rod satisfies the following formula relation, and wherein, △ t is the time in sampling interval;
In the described wear-resistant sluice valve controlling method based on computer system, when having pipeline or cryogenic ball valve to leak, the pressure in pipeline or the cryogenic ball valve will descend; When control system the ROD that calculates and the comparison of predefined parameter, exceed this parameter and then think the pressure drop excessive velocities of cryogenic ball valve or pipeline, then the valve operation is closed in the block valve of main line; Control system is also monitored the normal operating pressure of pipeline, when the abnormal conditions that force value occurs and exceed or be lower than this scope, throttle down.
For solving the problems of the technologies described above, the present invention also provides the wear-resistant sluice valve that uses in a kind of as above each described wear-resistant sluice valve controlling method based on computer system, and described wear-resistant sluice valve comprises: valve body, valve seat, flashboard, valve rod, valve gap, support and drive unit.
The weld seam that described valve body, valve seat connect adopts Full-automatic welding; Valve body, valve seat adopt U-shaped weld seam.
Described valve sealing face adopts the Si Taili cemented carbide, and roll forming is adopted on the surface; Sealing surface adopts automatic grinding.
Described wear-resistant sluice valve adopts Flexible disc, sets up lacing wire in flashboard T word groove one side, and the guiding groove edge at flashboard is designed to fillet, and strengthens guiding groove length.
The corner of the upper seal support of described wear-resistant sluice valve, Packing seat, filler pressing sleeve is designed to fillet, and endoporus strengthens the gap, and cylindrical reduces the gap; Stem surface adopts roll forming, and adopts surface carburization to process.
Ball valve of the present invention, the weld seam that valve body, valve seat connect adopts the full automatic welding connection technology, and valve body, valve seat adopt U-shaped weld seam, solve leak source in valve body, the valve seat weld seam.Valve sealing face adopts the Si Taili cemented carbide, and roll forming is adopted on the surface, prolongs the working life of valve.Sealing surface adopts automatic grinding, improves the Percent of contact area of sealing surface.Adopt Flexible disc, suitably reduce the elasticity ratio, valve seal is reliable.Set up lacing wire in flashboard T word groove one side, prevent that flashboard is stressed too quickly in the operating mode, T word groove is torn, and easily causes the accident.Guiding groove edge at flashboard is designed to fillet, and suitably strengthens guiding groove length, prevents that valve is stuck in the opening and closing process.The corner of upper seal support, Packing seat, filler pressing sleeve is designed to fillet, and endoporus suitably strengthens the gap, and cylindrical suitably reduces the gap.Stem surface adopts roll forming, and adopts surface carburization to process, and improves stem surface hardness, prevents that stem surface from pulling, plucking, reduces mechanical wear, has reduced the operational torque of valve.
Description of drawings
Fig. 1 is the valve control system structural drawing of the embodiment of the invention;
Fig. 2 is the valve control system functional diagram of the embodiment of the invention;
Fig. 3 is valve control method data sampling and the process chart of the embodiment of the invention;
Fig. 4 is AD7859 circuit connection diagram in the A/D module of the embodiment of the invention;
Fig. 5 is the RS-485 serial line interface long splice composition of the embodiment of the invention.
Embodiment
Cryogenic ball valve of the present invention comprises valve body, valve gap, valve component, spheroid, valve rod, spring, stationary axle, long-neck support, ceiling hold, drive unit etc.Valve body, valve gap respectively have runner, and valve body, valve gap connect by pad, double-screw bolt, nut.Spheroid places in the valve body, two sides of spheroid respectively are equipped with a valve component, and link to each other with the inside of valve body, valve gap respectively, drive unit links to each other by key with valve rod top, the valve rod lower end is connected with spheroid, drive unit rotates valve rod, spheroid is rotated around axis, realizes 90 ° of unlatchings of valve, closes.
Arc shaped surface is adopted in spheroid top and bottom surface, valve rod contact position, and both sides are the plane of respective parallel, and the spheroid bottom is connected in the spring that the bottom surface is provided with antistatic mutually by cylindrical hole and stationary axle, radial bearing, plane bearing.
The PCTFE material use in sealing, the low temperature of ability-196 ℃, and sealing surface and spheroid contact position employing arc contact surface.The seat ring external diameter adopts three grades of steps, adopts the combination seal form of fire-protection ring and lip-type packing, back-up ring.
Valve body and valve gap, between valve body and support, valve body lower end is connected with tongue-and-groove with stationary axle, uses little surface of contact between valve body and the valve gap, and there is little gap the outside, increases distortion, prevents that medium from leaking outside.
In order to prevent under the worst cold case, the inefficacy of stem packing sealing, cryogenic ball valve adopts the long-neck support Design, and increases anti-thermal baffle, and filler is placed on the upper end of long-neck support, effectively prevents the temperature transmission.
Stem material adopts F316, adopts solution treatment, and cryogenic treatment, and surface carburization processing are to improve surface hardness.
For reducing the operation moment of torsion of valve, at valve rod lower end cylindrical, stationary axle and spheroid lower end are provided with radial bearing.
The support that is connected with drive unit adopts 90 ° of spacing designs, can satisfy and use Pneumatic actuator or other drive units not to have spacing needs.
Cryogenic ball valve of the present invention is by valve body, valve gap, valve component, spheroid, valve rod, spring, stationary axle, long-neck support, ceiling hold, drive unit etc.Valve body, valve gap respectively have runner, valve body, valve gap connect by pad, bolt, nut, spheroid places in the valve body, the both sides of spheroid respectively are equipped with a valve seat, and link to each other with the inside of valve body, valve gap respectively, drive unit links to each other by key with valve rod top, and stem lower portion links to each other by the both sides plane contact with spheroid.The spheroid bottom links to each other with stationary axle, radial bearing, plane bearing by cylindrical hole.Sealing surface of seat and spheroid contact position adopt arc contact surface.The seat ring external diameter adopts three grades of steps, adopts the combination seal form of fire-protection ring and lip-type packing, back-up ring.
Valve body and valve gap, between valve body and long-neck support, valve body lower end is connected with tongue-and-groove with stationary axle, the little surface of contact of valve body and valve cover chamber, there is little gap the outside, increases distortion, prevents that medium from leaking outside.In order to prevent under the ultralow-temperature operation conditions, the inefficacy of stem packing sealing, ultra-low temperature ball valve adopts the long-neck support Design, and has increased thermal baffle, and filler is placed on the upper end of long-neck support, effectively prevents the temperature transmission.The internals materials such as valve rod adopt F316, adopt solution treatment, and cryogenic treatment, and surface carburization processing are to improve surface hardness.For reducing the operation moment of torsion of valve, at valve rod lower end external diameter, stationary axle and spheroid lower end are provided with radial bearing.The support that is connected with drive unit in addition adopts 90 ° of spacing designs, can satisfy the client and use Pneumatic actuator or other drive unit not to have spacing needs.
When carrying out valve opening, closing operation, the drive unit rotation valve rod, valve rod drives spheroid and rotates, and realizes 90 ° of unlatchings of valve, closes.
Valve body, valve gap material adopt F316, and valve seat adopts the PCTFE material, the low temperature of ability-196 ℃, and originally adopted the not low temperature of ability-196 ℃ of PTFE material, and during low temperature, easily produce cold flow, low temperature brittleness.Spheroid, stem material now adopt F316, adopt solution treatment, cryogenic treatment, surface carburization to process, and have improved surface hardness.
The hard seal wear-resistant gate valve of wedge-type of the present invention, valve body, valve gap material adopt WCB, and the valve sealing face material adopts cemented carbide, and surperficial rolling moulding is wear-resisting, and original valve sealing face material adopts 13Cr, and not wear-resisting, easily scratch.
The hard seal wear-resistant gate valve of wedge-type of the present invention is comprised of parts such as valve body, valve seat, flashboard, valve rod, valve gap, support, drive units:
One, the weld seam that this product valve body, valve seat connect adopts the full automatic welding connection technology.Valve body, valve seat adopt U-shaped weld seam, solve leak source in valve body, the valve seat weld seam, have reduced the impact that artificial welding butt welded seam quality causes, and have improved the up-to-standard rate of weld seam pressure testing, have relatively saved the valve manufacture cost.
Its two, valve sealing face adopts the Si Taili cemented carbide, roll forming is adopted on the surface, prolongs the working life of valve.Namely at flashboard, sealing surface of seat heap Si Taili cemented carbide.Washing away of this kind material oxidative stability, resisting sulfide, acidproof, high temperature resistant, wear-resisting, anti-particle media, its hardness can reach about HRC45.Sealing surface adopts automatic grinding, improves the Percent of contact area of sealing surface.
Its three, adopt Flexible disc, suitably reduce the elasticity ratio, valve seal is reliable.Set up lacing wire in flashboard T word groove one side, prevent that flashboard T word groove is stressed too quickly in the operating mode, T word groove is torn, and easily causes the accident.Guiding groove edge at flashboard, be designed to fillet, and suitably strengthen guiding groove length, reduce the gap between valve body guiding rib and flashboard guiding groove, flashboard guiding groove and valve body guiding rib fit dimension lengthen, prevent that valve is stuck in the opening and closing process, affect the normal opening and closing of valve, valve is suitable for vertically, level, inclination are installed.
Its four, the corner of upper seal support, Packing seat, filler pressing sleeve is designed to fillet, endoporus suitably strengthens the gap, cylindrical suitably reduces the gap.Stem surface adopts roll forming, and adopts surface carburization to process, and improves stem surface hardness, prevents that stem surface from pulling, plucking, reduces mechanical wear, has reduced the operational torque of valve.
1. the weld seam of this product valve body, valve seat connection adopts the full automatic welding connection technology, and valve body, valve seat adopt U-shaped weld seam, solve leak source in valve body, the valve seat weld seam.
2. valve sealing face adopts the Si Taili cemented carbide, and roll forming is adopted on the surface, prolongs the working life of valve.Sealing surface adopts automatic grinding, improves the Percent of contact area of sealing surface.
3. the employing Flexible disc suitably reduces the elasticity ratio, and valve seal is reliable.Set up lacing wire in flashboard T word groove one side, prevent that flashboard is stressed too quickly in the operating mode, T word groove is torn, and easily causes the accident.Guiding groove edge at flashboard is designed to fillet, and suitably strengthens guiding groove length, prevents that valve is stuck in the opening and closing process.
4. the corner of upper seal support, Packing seat, filler pressing sleeve is designed to fillet, and endoporus suitably strengthens the gap, and cylindrical suitably reduces the gap.Stem surface adopts roll forming, and adopts surface carburization to process, and improves stem surface hardness, prevents that stem surface from pulling, plucking, reduces mechanical wear, has reduced the operational torque of valve.
As shown in Figure 1, be the valve control system structural drawing of the embodiment of the invention.
Valve control system of the present invention comprises: main control module, energy supply control module, power supply, valve position signal module, I/O module, pressure transducer, temperature transducer, display modular, the A/D module, valve control module, valve events control circuit, communication module, bluetooth module, wireless module, and serial ports turns the USB module.
Described main control module, with described I/O module, communication module, valve control module links to each other, and is used for the described control system of whole control;
Described energy supply control module links to each other with described power supply with described I/O module, is used for controlling the power supply of described power supply;
Described power supply links to each other with described energy supply control module, is used to described control system power supply;
Described valve position signal module links to each other with described I/O module, is used for carrying valve position signal to described I/O module;
Described I/O module, respectively with described valve position signal module, energy supply control module, the A/D module, main control module links to each other, and is used for the input output of baseband signal information;
Described pressure transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the pressure of the pipeline that links to each other with cryogenic ball valve, and the aforementioned pressure signal is transferred to described A/D module;
Described temperature transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the temperature of the pipeline that links to each other with cryogenic ball valve, and the aforementioned temperature signal is transferred to described A/D module;
Described display modular links to each other with described A/D module, for the temperature and pressure of the pipeline that shows cryogenic ball valve or link to each other with cryogenic ball valve;
Described A/D module, respectively with described I/O module, pressure transducer, temperature transducer, display modular links to each other; Be used for pressure transducer, the signal of temperature transducer transmission carries out A/D or D/A conversion; And the information after will changing is communicated by letter with display modular with the I/O module;
Described valve control module links to each other with the valve events control circuit with described main control module respectively; Be used for and control the described control circuit that starts to do according to the instruction that described main control module sends, and send the signal that described valve events control circuit is passed back back to described governor circuit;
Described valve events control circuit links to each other with described valve control module, is used for controlling valve closing according to the instruction of its conveying, opens, and perhaps stops valve;
Described communication module, with described main control module, bluetooth module, wireless module links to each other, and is used for self or wireless data communication;
Described bluetooth module links to each other with described communication module, is used for self communication of described control system;
Described wireless module links to each other with described communication module, is used for the wireless telecommunications of described control system and outside;
Described serial ports turns the USB module, links to each other with described communication module, is used for the mutual conversion of serial data and usb data.
As shown in Figure 2, be the valve control system functional diagram of the embodiment of the invention.
According to the requirement of cryogenic ball valve and coupled pipeline, the control system of ball valve of the present invention can stable operation under abominable condition, each parts of control system are all selected higher reliability and lower power consumption.Supervisory system can be monitored the operating pressure of pipeline, and the valve chamber main line blocks the state of ball valve, the data that the state of actuator and ambient temperature etc. are relevant with the normal operation of pipeline.In monitoring, can also be uploaded to control centre with unusual data instant occurring.Excessive if there is the exceptional value that exceeds setting range and pressure drop rate for line pressure, control system can be controlled Shuttoff Valve automatically.
The pressure transducer input pressure signal of control system of the present invention.Temperature transducer input temp signal.Display modular has the vapour-liquid valve state-indicating function.The vapour-liquid valve state comprises: gas-oil valve reach position indication, gas-oil valve close put in place indication, gas-oil valve on the spot/remote status, control system explosion-proof door state.The control output of control system of the present invention also comprises automatically controlling when the monitoring pipeline is unusual closes valve.
The main control module of control system of the present invention receives from the I/O module, valve position state, state of alarm and the test mode of the gas-liquid actuator that valve control module is uploaded.Main control module accept from control centre open and close, stop three kinds of remote operation orders.Control system can be carried out at any time open and close, stop three kinds of operations according to the order of control centre.
Open the valve operation:
Open the valve condition: what control system was received control centre opens the valve order, opens the valve location switch not closed.
Open valve output: control system is put out valve output effectively, puts that to close valve output invalid.
Driving valve stops: opening the valve location switch closed, or receive new stopping valve or close the valve order.
Pass valve operation:
Close the valve condition: control system is received the pass valve order at center, and pass valve location switch is not closed.
Control system is put and is closed valve output effectively, puts out valve output invalid.
Close the valve location switch closed, or receive new stopping valve or open the valve order.
What control system was received control centre stops the valve order.
It is invalid that control system is put out valve output, puts that to close valve output invalid.
The major function of control system of the present invention can be divided into:
1. data acquisition and processing (DAP) part: control system of the present invention gathers required pressure, temperature, cell voltage, the data such as valve position state.And whether the main control module of control system need to be monitored these data normal, and the abnormal conditions terminal occurring need to process accordingly according to different situations.
2. communication part: control system is with usB interface, Bluetooth function, wireless communication function; USB interface is used for carrying out the setting of parameter and the configuration of some constants; Bluetooth function is used for short-range wireless telecommunications, convenient at ordinary times checking of inspector; Wireless communication function is used for the monitor staff's communication with control centre, occurs unusually can reporting control centre, and control centre also can carry out the Remote operation to the cryogenic ball valve valve chamber by control system of the present invention simultaneously.
3. control output: the control output of control system of the present invention is a kind of to be that control actuator opens, the closing valve action; Another is the work of control power module.
The signals collecting of control system of the present invention and filtering
1. signals collecting
Set-up of control system of the present invention is that per second is finished once sampling, and the analog signals of sampling by A/D module inlet opening comprises pipeline pressure AIN0, control system operating ambient temperature AIN4, cell voltage AIN47; The digital switch quantity signal that inlet opening by the I/O module gathers comprises that valve reaches a signal IN00, closes the signal IN01 that puts in place, control system chamber door signal IN02, and valve is long-range, local operation signal IN03.
2. the filtering method of pressure signal and the method for judge leaking
As the significant data of monitoring, when gathering pressure signal, in order to overcome the impact of interference, the control system of ball valve of the present invention is carried out the rolling average value filtering to sampled value repeatedly.Be the window of N at data length, when image data satisfies length of window, ask for arithmetic mean value according to following formula.
Adopt at this and just to utilize quantity of information filtering that new data provides after the new data and with former data cover, to obtain again the arithmetic mean value of N data in the current buffer area at last.According to new sampled value the filtering result is upgraded, i.e. one of the new collection of survey data just abandons the data that gathered before N time, measures and once just calculates mean value one time, has greatly accelerated the ability that data are processed.N can arrange change.
By the pressure data that the rolling average value filtering obtains, the pressure comparison that needs and front once sampling are calculated calculates the pressure drop speed (RoD) of per second.Consider temperature to the impact of pipeline pressure, by Clapyron Equation:
p·v＝n·R·T
P: pressure, v: rock gas volume, n: amount of substance, T: temperature, R: constant 8.31441
If in the situation that does not occur to leak, ROD is 0;
When occuring to leak, Rod satisfies the following formula relation, and wherein, △ t is the time in sampling interval;
Normally in service at pipeline, line pressure steadily remains on a fixing value range.When having pipeline or cryogenic ball valve to leak, the pressure in pipeline or the cryogenic ball valve will descend.When control system of the present invention is compared the ROD that calculates and predefined parameter, exceed this parameter and then think the pressure drop excessive velocities of cryogenic ball valve or pipeline, pipeline generation pipe explosion accident need to close to the block valve of main line the valve operation and reduce the loss as far as possible.In addition, control system of the present invention is also monitored the normal operating pressure of pipeline, when the abnormal conditions that force value occurs and exceed or be lower than this scope, and also can throttle down protection pipe safety.
As shown in Figure 3, be valve control method data sampling and the process chart of the embodiment of the invention.The collecting treatment flow process of the signal of control system of the present invention is:
The first step: main control module sends sign on;
Second step: temperature transducer passes through respectively the A/D module with the temperature signal that collects, and signal conversion and the conduction of I/O module report main control module with the temperature signal after processing;
The 3rd step: pressure transducer passes through respectively the A/D module with the pressure signal that collects, and signal conversion and the conduction of I/O module report main control module with the pressure signal after processing;
The 4th step: main control module carries out the rolling average value filtering;
The 5th step: main control module carries out ROD and calculates; Judging whether transfinites; If so, timer starts; Otherwise main control module detects by valve control module whether valve state is intermediate state;
The 6th step: valve state is intermediate state, starts timer, and the warning Processing tasks is started; Otherwise, detect the chamber door state;
The 7th step: the chamber door state is opened, and starts the warning Processing tasks; Otherwise, delayed time one second.
In the embodiment of the invention, the analog-digital converter that analog to digital conversion circuit adopts is the AD7859 of U.S. ADI company, and it is the AD converter of a high-speed, low power consumption, 8 passages, 12bit, adopts the 3V/5V single power supply.This device has self checking or system check function, can guarantee can change exactly when time and temperature variation.AD7859 has the sample rate of the highest 200kSPS, input voltage range: be 0-V during single-ended input
REF, difference input then is+-V
REF/ 2.In the design, reference voltage is selected external reference voltage source 5V.The CMOS structure guarantees that AD7859 power consumption under normal mode is 5.4mw, and 3.6uW is only arranged under low-power mode.
AD7859 has following main feature:
3V or SV Power supply, the applied power source management options transfers low-power consumption mode automatically to after converting; Two kinds with reference to electric source modes: internal reference voltage source and external reference voltage source.When adopting the external reference voltage source, voltage range is 1.2V ~ V
DD(power supply voltage); . self checking and system check; .8 position/16 bit data parallel interfaces (the system requirements parallel interface is 8 parallel-by-bit interfaces).
In the control system of ball valve of the present invention, the master clock signal CLKIN of equipment is set as 4MHz, adopts the external reference voltage source.AV
DD, DV
DDAfter powering on, first
Pulse triggering BUSY is high, the BUSY signal between high period,
Signal is inoperative, behind the 32ms, and the BUSY step-down.Next
Pulse triggering starts complete self checking, and triggers again BUSY for high, and checking time needs 32/72ms.
As shown in Figure 4, be AD7859 circuit connection diagram in the A/D module of the embodiment of the invention.After verification was finished, at CONVST rising edge of a pulse subsequently, tracking/retainer was converted to Holdover mode from tracing mode on the sheet, and and then the CLKIN signal trailing edge after the CONVST starts the AD conversion.If the rising edge of CONVST pulse occured before the trailing edge 10ns of CLKE capable of signal, begin to finish conversion through 16.5 clock cycle from the CLKIN trailing edge.If before CLK gets trailing edge, CONVST does not reach the building-up time of 1ons, and conversion then needs 17.5 clock cycle.After converting, BUSY signal step-down, transformation result can be exported by data/address bus.Next time when the CONVST burst length does not reach 200ns, forbid read-write operation in transition period or distance.
In the control system of ball valve of the present invention, to the configuration of the running parameter of AD7859 by finishing with the write operation of twice pair of AD control register of byte mode (16hit).Word/byte manipulation is by the high-low level control of W/B pin, and read/write is followed first low rear high sequence of operation, and configuration parameter comprises: sampling channel is selected, powder source management mode, sample rate etc.After the AD control register configures, provide a CONVST switching signal by primary processor, after the AD7859 power-on self-test is finished, the circuit-switched data sampling that sets in advance, sampling is finished, and ADC internal trigger AD interrupts, and main control unit INT6 response AD interrupts, in the AD interrupt service subroutine, single-chip microcomputer makes two bites at a cherry and reads sampled value in the adc data register.The single channel unitary sampling is finished, and again by write operation configuration AD control register, carries out another circuit-switched data sampling, and after four tunnel samplings were all finished, the circulation aforesaid operations was until finish the AD sampling.
As shown in Figure 5, be the RS-485 serial line interface long splice composition of the embodiment of the invention.Ball valve control system data transmission circuit design of the present invention is as follows:
With respect to the RS-232 serial line interface, it is high that the RS-485 that the present invention uses has data transfer rate, maximum transmission distance is far away, the advantages such as noise immunity is good, between the ball valve control system module of the present invention, and between ball valve control system of the present invention and the control centre, adopt RS-485 (two-wire) asynchronous serial port to realize communication.
RS-485 adopts the differential signal negative logic, the voltage difference of line-to-line is+2 ~+6V between presentation logic " 0 ", the voltage difference of line-to-line is-6V--2V presentation logic " 1 ".Chip adopts the MAX487ESA communication chip of Maxim company.This chip 4.75 ~ 5.25V power supply, semiduplex mode, peak data transfer rate can reach 250kbPs, have+-over-voltage protecting function of 15kV.Its long splice composition as shown in Figure 5.
In the system transmissions process, in order to guarantee the data zero defect, without losing transmitting, serial networking equipment Nport5430 of the present invention is configured to two-wire RS-485 pattern: position of rest, check bit, data bit etc. are consistent with the data format of circuit transmission interface; NPort5430 has added automatic flow control function, and simultaneously, FIFO enables.
Ball valve control system real time clock circuit of the present invention:
Data capture need to be mapped the data that gather with gathering environment, carry out corresponding data processing work, and therefore, in control system of the present invention, all data must mark correct time information.If adopt the clock source of inaccuracy or variation, the data that can cause gathering do not have accurately environmental information, and data do not have too many meaning undoubtedly, so the clock source of selecting a highi degree of accuracy, low power consumption is very necessary.DS1307 is a highi degree of accuracy, the low power consumption that DallaSSemieonduetor company releases, 8 pin real-time timepiece chips of binary-coded decimal.This chip provides the month to date error less than 10 seconds accuracy of timekeeping, and inner integrated IZc EBI has the non-volatile ram of 8 specified registers and 56Byte in the sheet.
In addition, control circuit possesses the power supply measuring ability on the sheet of DS1307, and the switching between management primary power supply and the standby power supply.
Claims (10)
1. a cryogenic ball valve is characterized in that, comprises valve body, valve gap, valve component, spheroid, valve rod and stationary axle.
2. described cryogenic ball valve according to claim 1 is characterized in that, described valve body, valve gap respectively have runner, and valve body, valve gap connect by pad, double-screw bolt, nut.
3. described cryogenic ball valve according to claim 1 is characterized in that, described spheroid places in the valve body, and two sides of described spheroid respectively are provided with a valve component, and link to each other with the inside of described valve body, described valve gap respectively.
4. described cryogenic ball valve according to claim 1 is characterized in that, described cryogenic ball valve further is provided with drive unit, and described drive unit links to each other by key with described valve rod top, and described valve rod lower end is connected with described spheroid.
5. described cryogenic ball valve according to claim 1, it is characterized in that, described spheroid top and bottom surface, valve rod contact position are arc shaped surface, both sides are the plane of respective parallel, described spheroid bottom links to each other with stationary axle, radial bearing, plane bearing by cylindrical hole, and is provided with the spring of antistatic in the bottom surface.
6. one kind such as the control system of cryogenic ball valve as described in each among the claim 1-5, it is characterized in that, comprising: main control module, energy supply control module, power supply, valve position signal module, the I/O module, pressure transducer, temperature transducer, display modular, A/D module, valve control module, the valve events control circuit, communication module, bluetooth module, wireless module, and serial ports turns the USB module.
7. the control system of described cryogenic ball valve according to claim 6 is characterized in that,
Described main control module, with described I/O module, communication module, valve control module links to each other, and is used for the described control system of whole control;
Described energy supply control module links to each other with described power supply with described I/O module, is used for controlling the power supply of described power supply;
Described power supply links to each other with described energy supply control module, is used to described control system power supply;
Described valve position signal module links to each other with described I/O module, is used for carrying valve position signal to described I/O module;
Described I/O module, respectively with described valve position signal module, energy supply control module, the A/D module, main control module links to each other, and is used for the input output of baseband signal information;
Described pressure transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the pressure of the pipeline that links to each other with cryogenic ball valve, and the aforementioned pressure signal is transferred to described A/D module;
Described temperature transducer links to each other with described A/D module, is used for the perception cryogenic ball valve or the temperature of the pipeline that links to each other with cryogenic ball valve, and the aforementioned temperature signal is transferred to described A/D module;
Described display modular links to each other with described A/D module, for the temperature and pressure of the pipeline that shows cryogenic ball valve or link to each other with cryogenic ball valve;
Described A/D module, respectively with described I/O module, pressure transducer, temperature transducer, display modular links to each other; Be used for pressure transducer, the signal of temperature transducer transmission carries out A/D or D/A conversion; And the information after will changing is communicated by letter with display modular with the I/O module;
Described valve control module links to each other with the valve events control circuit with described main control module respectively; Be used for and control the described control circuit that starts to do according to the instruction that described main control module sends, and send the signal that described valve events control circuit is passed back back to described governor circuit;
Described valve events control circuit links to each other with described valve control module, is used for controlling valve closing according to the instruction of its conveying, opens, and perhaps stops valve;
Described communication module, with described main control module, bluetooth module, wireless module links to each other, and is used for self or wireless data communication;
Described bluetooth module links to each other with described communication module, is used for self communication of described control system;
Described wireless module links to each other with described communication module, is used for the wireless telecommunications of described control system and outside;
Described serial ports turns the USB module, links to each other with described communication module, is used for the mutual conversion of serial data and usb data.
8. the control system of described cryogenic ball valve according to claim 6 is characterized in that described pressure transducer input pressure signal; Described temperature transducer input temp signal; Described display modular has the vapour-liquid valve state-indicating function; The vapour-liquid valve state of described control system comprises: gas-oil valve reach position indication, gas-oil valve close put in place indication, gas-oil valve on the spot/remote status, control system explosion-proof door state.
9. the control system of described cryogenic ball valve according to claim 6 is characterized in that, described main control module receives from the I/O module, valve position state, state of alarm and the test mode of the gas-liquid actuator that valve control module is uploaded; Described main control module accept from control centre open and close, stop three kinds of remote operation orders.Control system can be carried out at any time open and close, stop three kinds of operations according to the order of control centre.
10. the control system of described cryogenic ball valve according to claim 9 is characterized in that,
The described valve of opening is operating as:
Open the valve condition: what control system was received control centre opens the valve order, opens the valve location switch not closed;
Open valve output: control system is put out valve output effectively, puts that to close valve output invalid;
Driving valve stops: opening the valve location switch closed, or receive new stopping valve or close the valve order;
Described pass valve is operating as:
Close the valve condition: control system is received the pass valve order at center, and pass valve location switch is not closed;
Control system is put and is closed valve output effectively, puts out valve output invalid;
Close the valve location switch closed, or receive new stopping valve or open the valve order;
The described valve that stops is operating as:
It is invalid that control system is put out valve output, puts that to close valve output invalid.
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