CN2138727Y - Electromechanic integrate digit control pneumatic adjustable valve - Google Patents

Abstract

The utility model relates to an electromechanic integrate digit control pneumatic adjustable valve, which is suitable for flow regulation in various large-sized gas pipe lines and infusion-solution pipe lines. The electromechanic integrate digit control pneumatic adjustable valve comprises a common pneumatic adjustable valve, a gas source, a pressure-regulating valve core and a slide block, etc. The electromechanic integrate digit control pneumatic adjustable valve is characterized in that a threaded rod is matched with the slide block, and the upper end is connected with a big velocity-ratio decelerator and a digital-control electric machine; a pressure sensor and a leakage-controlling valve are equipped on the gas chamber of the pneumatic valve. A standard industrial control interface and an adapting module which is plugged in the standard industrial control interface are provided, and the control interface is connected with a central control computer which is mutual through a serial port. As adopting the electromechanic integrate form of the computer and the control interface plus the observing-controlling element, the opening value of the valve can be controlled in manner of digital, and thus operation is convenient.

Description

Electromechanic integrate digit control pneumatic adjustable valve

A kind of electromechanical integrated digital-control pneumatic regulating valve, it is applicable in various large-scale gas transmissions, liquid pipeline, regulates the flow of being carried.As the oil, the natural gas that are used for the oil field are exploited delivery line.

In the present various oil and natural gas delivery line, use large-scale pneumatic control valve to carry out flow control.When in air chamber, feeding the gas of certain pressure,, play the effect of amplifying adjusting power because the pressure distortion of film causes that the aperture of valve changes.And the adjusting of air chamber pressure is again by in the control gas circuit, controls air chamber pressure with a pressure regulator valve.Pressure regulator valve is spring normally.Withstand a movable adjusting pressuring valve core with a pressure spring, under the balanced action of gas pressure, spool has certain opening amount, expenditure and pressure by the opening amount, keep the constant of air chamber pressure value, and the setting of air chamber pressure value is to realize by the pretightening force of regulating pressure spring.Because initial tension of spring by manual adjustment, changes valve opening and all must readjust, therefore at every turn, when needs are often regulated, bigger workload is arranged, also incompatibility automation mechanized operation, and the change value of adjustment amount and aperture neither linear relationship, needs certain adjusting skill.

The purpose of this utility model is the numerical control pneumatic diaphragm valve of a kind of electromechanical integration of invention, and the form that it still uses air film to amplify is by the aperture of air chamber pressure regulating valve.By adopting electromechanical integration technology, thus can be by the opening value of digital control change spool, easy to operate.

The utility model as shown in Figure 1, it has valve body (1), spool (2), connecting rod (3), air film (4), air chamber (5), source of the gas (6), adjusting pressuring valve core (7), pressure spring (8) and slide block (9), it is characterized in that: on slide block (9) axis, screw thread is arranged, there are screw rod (13) and this screw thread to match, there are large speed ratio retarder (14) and numerical-control motor (15) in screw rod (13) upper end, at valve body (1) standard industrial control (11) is arranged nearby, pressure transducer (12) and controllable leak valve (19) are housed on air chamber (5), in standard industrial control (11), be inserted with the adaptation module (16) that numerical-control motor (15) is controlled, adaptation module (17) that controllable leak valve (19) is controlled and the measurement adaptation module (18) that is connected in pressure transducer (12), standard industrial control (11) links to each other by the standard serial interface central control computer common with can be other Measurement and Control System (10).

Accompanying drawing 1 is a structural representation of the present utility model, valve body (1), spool (2), connecting rod (3), air film (4), air chamber (5), source of the gas (6), adjusting pressuring valve core (7), pressure spring (8), slide block (9), central control computer (10), standard industrial control (11), pressure transducer (12), large speed ratio retarder (14), numerical-control motor (15), adaptation module (16), adaptation module (17) is arranged among the figure, measure adaptation module (18) and controllable leak valve (19).

The utility model still uses the middle gas pressure of air chamber (5) that the position of spool (2) is controlled, with the aperture of this control valve.When air chamber (5) pressure kept certain value, spool (2) invariant position kept certain valve opening value, thereby guarantees certain output flow.The utility model keeps the method for air chamber (5) pressure to be: when pressure reduces, adjusting pressuring valve core (7) bottom surface pressure reduces, pressure imbalance with pressure spring (8), under the effect of pressure spring (8), adjusting pressuring valve core (7) moves down its import aperture is increased, chock pressure difference reduces, and the pressure recovery of air chamber (5) keeps the balance with pressure spring (8) again.Otherwise when air chamber (5) pressure raise, adjusting pressuring valve core (7) bottom surface pressure increased, greater than the pressure of pressure spring (8), make on the adjusting pressuring valve core (7) and move, thereby the import aperture is reduced, chock pressure difference increases, and delivery pressure is reduced, and keeps and the spring equilibrium of forces again.It is certain that the pressure of source of the gas (6) keeps, by adjusting pressuring valve core (7) to air chamber (5) air feed.Controllable leak valve (19) is arranged on air chamber (5), be in off status during work, but certain leakage throttling osculum is arranged, certain pressure regulation aperture is arranged to guarantee adjusting pressuring valve core (7).When running into special circumstances, leak valve (19) is opened greatly, and it is zero substantially that air chamber (5) pressure descends, and makes valve openings close (regulating for positive opening) rapidly or reaches maximum opening (regulating for anti-opening) rapidly.When the needs controlling opening of valve, central control computer (10) sends address gating signal by the standard serial communication interface, after standard industrial control (11) is received address gating signal, the adaptation module (18) of gating control corresponding motor, when needs increase valve opening value, central control computer (10) sends the positive rotaring signal of motor, latchs and controls numerical-control motor (15) by adaptation module (16) and just change.After adaptation module (16) latchs, central control computer (10) sends new address gating signal, measure adaptation module (18) by standard industrial control (11) gating, measure adaptation module (18) and constantly the delivery pressure value that pressure transducer (12) records is sent back to central control computer (10) after the A/D conversion, compare by the processing of central control computer (10) and the adjusted value of requirement, after meeting the demands, again send the address gating signal of gating adaptation module (16), gating adaptation module (16), provide numerical-control motor (15) stall signal, by the stall of adaptation module (16) control motor.Because in adjustment process, numerical-control motor (15) drives screw rod (13) forward rotation by retarder (14) when just changeing, and slide block (9) is moved down, increase the precompression of pressure spring (8), thereby increased the opening value of the utility model spool (2).Otherwise, when needs reduce the opening value of the utility model spool (2), central control computer (10) is similar with control increase opening value process, just control numerical-control motor (15) is just being changed into its counter-rotating of control, screw rod (13) drives slide block (9) and moves up, reduced the preload pressure of pressure spring (8), spool (2) opening value is reduced.

The utility model adopts central control computer and standard industrial control to add the method for this electromechanical integration of observing and controlling element, can regulate control to air chamber pressure by digitizing technique, thereby adjust the aperture of valve, the operating difficulties problem when having solved manual tune.In adjustment process, regulate control by the force value of direct measurement air chamber, also solved the nonlinear problem of valve opening and slider displacement.Because the measuring accuracy of pressure transducer is very high.Therefore the utility model has higher setting accuracy.

In the utility model, the same with common pneumatic control valve by valve body (1), spool (2), connecting rod (3), air film (4) with the pneumatic control valve that air chamber (5) is formed, can directly select for use.The adjusting pressuring valve core (7) that is used to regulate air chamber pressure is the same with common spring pressure regulator valve, can use existing modulating valve to carry out Transform Type design or directly transformation.Can use the form as the given moving valve core of the utility model accompanying drawing 1, its spool also can be the distortion form of film.Controllable leak valve (19) can use the common logical valve that ends, just on valve and connect a throttling pore, make its by the time, also have a little throttling path.Throttling pore can be made on the spool, also can be independent branch road.

In the utility model, retarder (14) can use multistage common retarder, also can use harmonic gear reducer, and bigger reduction speed ratio is arranged.Can also use " a kind of big speed through the differential speed reducer " of number of patent application, very high reduction speed ratio and very little volume are arranged as CN91103847.Numerical-control motor in the utility model (15) can use common stepper motor, but for simplifying Electric Machine Control and drive system, also can adopt the autosynchronous motor of making rotor of rare earth permanent-magnetic material.As use variable-frequency power sources to drive, and can adjust the rotating speed of motor by the frequency of adjusting variable-frequency power sources, for example the patent No. is the patent of CN89209067.Or to use with the Hall element be the electric motor with random coaxial reversing that does not have the Detecting element of machinery contact synchronous communicating controller, and for example the patent No. is the patent of CN89215098.The same with common DC motor, can control the electric machine industry operating mode by input voltage, also can control it with numerical control method.Adopt the p-m rotor of rare earth material, can bigger starting torque be arranged, make simple than induction machine.The utility model can also be made an integral body to motor and retarder, and for example number of patent application is the patent of CN91103795 " a kind of differential reducing electric servo unit ", and littler composite structure size is arranged.

In the utility model, standard industrial control (11) can be selected the I/OK32 of U.S. ME company (MECHATRONICBQUIPMENT INC.) for use, or the PB16AH of U.S. OPTO 22 companies.Insert in the adaptation module (16) in the standard industry interface (11), OAC5 and the AD3 module that (17) and (18) can be U.S. OPTO 22 companies respectively.Central control computer (10) can be selected the LC4 controller of U.S. OPTO 22 companies for use, also can select the U.S. PCS-1 of ME company industrial process Control work station for use.

Claims (1)

1, a kind of electromechanical integrated digital-control pneumatic regulating valve, it has valve body (1), spool (2), connecting rod (3), air film (4), air chamber (5), source of the gas (6), adjusting pressuring valve core (7), pressure spring (8) and slide block (9), it is characterized in that: on slide block (9) axis, screw thread is arranged, there are screw rod (13) and this screw thread to match, there are large speed ratio retarder (14) and numerical-control motor (15) in screw rod (13) upper end, at valve body (1) standard industrial control (11) is arranged nearby, pressure transducer (12) and controllable leak valve (19) are housed on air chamber (5), in standard industrial control (11), be inserted with the adaptation module (16) that numerical-control motor (15) is controlled, adaptation module (17) that controllable leak valve (19) is controlled and the measurement adaptation module (18) that is connected in pressure transducer (12), standard industrial control (11) links to each other by the standard serial interface central control computer common with can be other Measurement and Control System (10).

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