RU2216762C1 - Gear to adjust parameters of gas flow - Google Patents

Abstract

FIELD: remote control over pressure, flow rate and precise stabilization of adjusted parameter of any gaseous agents, except corrosive, in gas, oil and other branches of industry. SUBSTANCE: gear to adjust parameters of gas flow has axial valve with elastic gate matched with distributor installed in pipe-line, pilot controller including spring mechanism and adjusting unit and is supplemented with electropneumatic converter, pressure regulator and two throttles. Control chamber divided by means of additional membranes into two spaces, each can be connected to output of electropneumatic converter, is formed between spring mechanism and adjusting unit of pilot controller. EFFECT: increased accuracy of adjustment of pressure, flow rate of gas and stabilization of output parameter with simultaneous provision for operation remote setting of adjusted parameter of gas flow, maximum unification of gear with articles brought into production earlier. 2 dwg

Description

 The invention relates to gas distribution and can be used for remote control of pressure, flow and accurate stabilization of the adjustable parameter of any gaseous medium, except aggressive, in gas, oil and other industries. For example, for remote control and stabilization of the parameters of natural gas supplied to the consumer from gas distribution stations, gas control points, gas reduction plants.

 Known controlled gas pressure regulator (patent EPO 0522188, class G 05 D 16/20 from 10.07.91), containing a pressure regulator and electromagnetic drive. Upon receipt of the input electrical signal, the electromagnet acts on the spring mechanism of the pressure regulator, which leads to a change in the regulator setting. The magnitude of the effect depends on the magnitude of the input electrical signal. The controller allows you to remotely change the setting.

 The disadvantage of this controller is the high power of the control signal, since the electromagnet acts directly on the spring mechanism.

 A device for controlling the flow of a fluid is known (RF patent 2099770 dated 03/22/96, IPC G 05 D 7/06). The device comprises an actuator and a parameter control device. Actuator is essentially an axial gas pressure regulator with a remote change in the output pressure setting. The device comprises a housing with inlet and outlet nozzles mounted on the pipeline, a drive in the form of a linear stepper motor made non-contact with a passive reciprocating armature. The change in the value of the output parameter is achieved by applying voltage to the control winding of the linear stepper motor. In this case, depending on the cyclogram of switching on the windings, a discrete movement of the armature by one or several steps is provided, as well as a direction of movement. The step size is determined by the design parameters. The magnitude and number of control signals are generated by the parameter control device, which, depending on the signals of the parameter sensors and the external reference signal, generates command signals to the actuator.

 The device allows you to control both pressure and flow, but discretely. Discreteness is the main disadvantage of this device, because the accuracy and linearity of the control characteristic is a function of the number of steps. The shorter the step, the more accurate. But an increase in the number of steps leads to a complication of the linear motor, an increase in the design of the actuator, and an increase in the number of control signals, i.e. to the complication of the parameter control device.

 The closest analogue (prototype) of the claimed invention is an axial type pressure regulator RDO-1 (Operation manual RDO-1, approved. 12.11.97. ZI2.501.000. RE. Developer and manufacturer of LLC Gazpriboravtomatika LLC). RDO- 1 contains an axial valve mounted on the pipeline with an elastic shutter coupled to the distributor, and a pilot regulator including a spring mechanism and a regulating unit.The first input and output of the regulator are respectively connected to the first output and input of the distributor.

 The RDO-1 regulator provides only maintenance at the set level of the output pressure value. In cases where remote control of pressure and flow rate is required, accurate stabilization of the controlled parameter of the gas flow supplied to the consumer, this regulator is not applicable.

 The technical task of the invention is to expand the functionality of the device, namely improving the accuracy of regulation of pressure, gas flow and stabilization of the output parameter while providing a remote setting (in a wide range) of the adjustable parameter of the gas flow.

 The stated technical problem is achieved due to the fact that the device for controlling the gas flow parameters contains an axial valve mounted on the pipeline with an elastic shutter coupled to the distributor, and a pilot regulator including a spring mechanism and a control unit. The first input and output of the pilot regulator are respectively connected to the first output and input of the distributor. An electro-pneumatic converter, a reducer, and two throttles are additionally introduced into the device, one of which is installed between the low pressure side of the pipeline and the second input of the pilot regulator, in which a control chamber is made between the spring mechanism and the control unit, which is divided by additional membranes into two cavities, each of which, optionally, can be connected to the output of an electro-pneumatic converter, the pneumatic input of which is in communication with the output and, through another choke, with orym input gear. The first input of the gearbox is connected to the second output of the distributor.

 Comparative analysis with the prototype shows that an electro-pneumatic converter, a reducer and two throttles, one of which is installed between the low pressure side of the pipeline and the second inlet of the pilot regulator, in which a control chamber is divided between the spring mechanism and the control unit, is additionally introduced into the inventive device. using additional membranes into two cavities, each of which can optionally be connected to the output of the electro-pneumatic converter, pneumatically cue input of which communicates with the outlet and through the other choke, a second input gear, a first input of the latter is connected to the second output of the distributor.

 Thus, the set of essential features of the claimed technical solution, due to the presence of new features, provides a technical result, expressed in expanding the functionality of the device. The design solution of the device makes it possible to quickly remotely change the set point (in a wide range) in terms of pressure and flow rate, increases the accuracy of stabilization of the output parameters of the gas flow while ensuring structural simplicity and maximum standardization with commercially available controllers.

 These essential features together, characterizing the essence of the claimed technical solution, are not currently known for regulatory devices. The analogue, characterized by the identity of all the essential features of the claimed invention, was not found during research, which allows us to conclude that the claimed technical solution meets the criterion of "Novelty."

 The essential features of the claimed invention cannot be represented as a combination identified from known solutions with the implementation in the form of distinctive features to achieve a technical result, from which it follows that the criterion of "Inventive step" is met.

 Due to the fact that the described technical solution is intended for use within a real gas distribution system and has been tested to achieve the claimed technical result, the present invention meets the criterion of "Industrial applicability".

 Figure 1 shows a structural diagram of a device for controlling the parameters of the gas stream.

 Figure 2 presents the connection diagram of the device for controlling the parameters of the gas flow with external control.

 The device (Fig. 1) contains an axial valve mounted on the pipeline 1 with an elastic shutter 2, hermetically connected to the distributor 3, a pilot regulator 4, a reducer 5, an electro-pneumatic converter 6, two throttles 7 and 8, pressure gauges 9 and 10. The pilot regulator 4 contains a spring mechanism 11 and a control unit 12, including a nozzle 13 in contact with the valve 14. In the pilot controller 4 between the spring mechanism 11 and the control unit 12, a control chamber 15 is made, separated by membranes 16 and 17 into two cavities A and B, each of which, optionally, via communication line 18 can be connected to the output (OUT) of the electro-pneumatic converter 6, the pneumatic input (I) of which is connected via communication line 19 with a pressure gauge 9, output (OUT) and, via the inductor 7, with the second input (В2) of the gearbox 5. The first input (BX1) of the gearbox 5 via communication line 20 is connected to the second output (OUT2) of the distributor 3, the first output (OUT1) of which is connected via the communication line 21 to the first input (BX1) of the pilot controller 4, whose second input (BX2) on the communication line 22 through the throttle 8 is connected to a manometer 10, a pressure sensor (n and figure 1 is not shown) and the pipe 1 from the low pressure side. The output (OUTPUT) of the pilot controller 4 via a communication line 23 is connected to the input (IN) of the distributor 3.

 The connection diagram of the device with external control (figure 2) includes a unit for processing information and generating a control signal (controller) 24, a flow meter 25, a pressure sensor 26.

 The device operates as follows.

 The reduced gas flows from the pipeline 1 to the axial valve with an elastic shutter 2. A part of this gas through the distributor 3 via the communication line 21 enters the first input (ВХ1) of the pilot regulator 4, a part - through the communication line 20 to the first input (ВХ1) of the gearbox 5. From the first input (BX1) of the pilot controller 4, the gas through the nozzle 13 in contact with the valve 14 passes to the output (OUT) of the controller 4 and through the communication line 23 through the distributor 3 to the pipeline 1.

 From the output (OUTPUT) of the reducer 5, gas through the communication line 19 is supplied to the power (VX) of the electro-pneumatic converter 6 and through the throttle 7 to the second input (VX2) of the reducer 5. The pressure on the communication line 19 is controlled by a pressure gauge 9.

 The output pressure setpoint is set by the spring mechanism 11 of the pilot controller 4 and is controlled by a manometer 10. The output pressure is stabilized by the fact that the deviation of the controlled pressure is transmitted through the throttle 8 via feedback line 22 to the second input (BX2) of the pilot controller 4, which creates a force that counteracts the force created by the spring mechanism 11 and, accordingly, adjusts the state of the regulatory unit 12 of the pilot controller 4.

 The value of the output parameter can be changed remotely, for which an external control signal in the standard range of 4 ... 20 mA is supplied to the input (VX) of the electro-pneumatic converter 6. In the electro-pneumatic converter 6, the feed gas of 0.14 MPa is converted into a control pneumatic signal in the standard range of 0.02 ... 0.1 MPa and is proportional to the input electric one. This signal through the communication line 18 enters the cavity A or B of the control chamber 15. At the same time, a force is created on the membrane 16, which either enhances the action of the spring mechanism 11 (when it enters the chamber A) or weakens it (when it enters the chamber B). Accordingly, the magnitude of the outlet pressure in the pipeline 1.

 The use of a gas flow parameter control device (Fig. 2) together with external parameter control devices and information processing tools allows you to perform three main functions: pressure control, gas flow control, increase the accuracy of stabilization of the output parameter value.

 A program is embedded in the controller 24, which converts the received information, depending on the external signal, into control signals to the electro-pneumatic converter 6 in the standard range from 4 to 20 mA.

 Changing the pressure setting (pressure control) is achieved by applying a signal from the controller 24 to the electro-pneumatic converter 6. The execution is controlled by feedback from the pressure sensor 26.

 Flow control (flow restriction) is also achieved by supplying control signals to the electro-pneumatic transducer 6, aimed at changing the output pressure. The performance is controlled by feedback from the flow meter 25.

 Improving the accuracy of the output parameter (pressure, flow) is achieved by applying to the electropneumatic transducer 6 corrective signals from the controller 24 depending on changes in the signals from the sensors 25 and 26.

 In order to unify the proposed device as a reducer 5, we apply a pilot regulator from a commercially available RDO-1, taken as a prototype.

 Thus, the claimed invention provides a technical result, which is expressed in expanding the functionality of the device, namely, increasing the accuracy of regulating pressure, gas flow, stabilizing the output parameter while providing an operational remote set point (over a wide range) of the adjustable gas flow parameter. At the same time, maximum unification is achieved with products previously mastered by production and constructive simplicity.

Claims (1)

 A device for controlling gas flow parameters, comprising an axial valve with an elastic shutter mounted on the pipeline, coupled to the distributor, and a pilot regulator including a spring mechanism and a control unit, the first input and output of this regulator are respectively connected to the first output and input of the distributor, characterized in that an electro-pneumatic converter, a reducer and two throttles, one of which is installed between the pipeline on the low-pressure side, are additionally introduced into the device the second input of the pilot regulator, in which a control chamber is made between the spring mechanism and the regulating unit, divided by two membranes into two cavities, each of which can be selectively connected to the output of the electro-pneumatic transducer, the pneumatic input of which is connected to the output through another throttle - with the second input of the gearbox, the first input of the latter is connected to the second output of the distributor.

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