Multi-redundancy speed regulation system of 2+3 mode

Abstract

The utility model belongs to the technical field of water-turbine generator set speed regulation system control, and provides a 2 + 3 mode multi-redundancy speed regulation system, which comprises an electrical control component and an execution component, the execution component comprises a double-fine oil filter, a self-centering motor device, a main distributing valve, a first servo proportional valve, a second servo proportional valve, a double-proportional-valve switching valve, a motor / proportional valve switching valve, an emergency stop hydraulic valve and an emergency stop electromagnetic valve. According to the utility model, a proportional valve and stepping motor redundancy control mode or a double-servo proportional valve redundancy control mode and the like can be flexibly selected according to requirements, various fault conditions occurring in the operation process of equipment can be easily handled, and the reliability and the control stability of the equipment are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of control of speed regulation systems of hydro-generator sets, and in particular relates to a 2+3 mode multi-redundant speed regulation system. Background Art

[0002] The main pressure regulating valve is a power-stage hydraulic amplifier in the turbine governor's mechanical hydraulic system. Using an electro-hydraulic converter or motor, it converts and amplifies electrical signals into hydraulic signals proportional to the direction of the servo flow rate. This hydraulic signal controls the opening and closing of the servo, which in turn pushes the turbine inlet guide vanes to control the turbine inlet flow rate and, consequently, the turbine speed. Turbine-generator governors typically utilize a dual-redundancy proportional valve and motor or a single proportional valve or motor. These single-use approaches lack the flexibility to handle various fault conditions, requiring maintenance or operation. Therefore, the development of turbine governor systems with diverse control methods is urgently needed. For example, Chinese patent CN219549251 U discloses a triple-redundant speed regulator mechanical hydraulic system, comprising a main pressure-regulating valve and a proportional valve. The main pressure-regulating valve is provided with a pilot valve and an actuator control chamber. The pilot valve extends into the actuator control chamber, and the proportional valve is connected to the actuator control chamber for supplying or returning oil to or from the actuator control chamber. The system also includes a servo motor and a digital valve. The servo motor is mounted on the main pressure-regulating valve to drive the pilot valve, and the digital valve is connected to the actuator control chamber for supplying or returning oil to or from the actuator control chamber. This triple-redundant speed regulator mechanical hydraulic system, formed by providing a triple-redundant control structure with proportional valves, digital valves, and servo motors, allows for selective control of a pair of pilot valves, improving control stability of the main pressure-regulating valve and addressing various fault conditions. It combines the advantages of motor-type, proportional valve-type, and digital valve-type systems, offering far superior reliability and regulation quality than single-channel and dual-channel systems. However, single-proportional valve control can be prone to oil quality issues, causing the proportional valve to become stuck, resulting in equipment failure, and thus insufficient reliability. Utility Model Content

[0003] The purpose of the utility model is to provide a 2+3 mode multi-redundant speed control system, which can flexibly select a proportional valve + stepper motor redundant control mode, or a dual servo proportional valve redundant control mode, etc., to overcome the defect that the traditional turbine generator set speed control system lacks a convenient response mechanism for various faults occurring during equipment operation.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a 2+3 mode multi-redundant speed control system, including an electrical control component and an executive component, the electrical control component adopts a dual programmable controller, the executive component includes a dual fine oil filter, a self-centering motor device, a main pressure regulating valve, a first servo proportional valve, a second servo proportional valve, a dual proportional valve switching valve, a motor / proportional valve switching valve, an emergency stop hydraulic valve, and an emergency stop solenoid valve; wherein the input end of the dual fine oil filter is connected to the oil supply pipeline, and the output end is connected to the first servo The constant pressure chambers of the servo proportional valve, the second servo proportional valve and the main pressure-regulating valve are connected; the self-centering motor device is arranged on the main pressure-regulating valve and is transmission-connected to the guide valve of the main pressure-regulating valve; one end of the dual-proportional valve switching valve is respectively connected to the first servo proportional valve and the second servo proportional valve, and the other end is connected to the motor / proportional valve switching valve; one end of the motor / proportional valve switching valve is respectively connected to the dual-proportional valve switching valve and the self-centering motor device, and the other end is connected to the emergency stop hydraulic valve; the emergency stop hydraulic valve and the emergency stop solenoid valve are connected to the main pressure-regulating valve.

[0005] The main pressure-regulating valve comprises a pilot valve, a constant-pressure chamber, and a control chamber. The pilot valve sleeve is integrally connected to the main pressure-regulating valve piston, providing 1:1 mechanical position feedback from the main pressure-regulating valve to the pilot valve, thereby forming a closed-loop control system in which the main pressure-regulating valve follows the pilot valve. By changing the control valve group of the main pressure-regulating valve from a separate arrangement to an integrated arrangement, all hydraulic components are designed and installed on the hydraulic integrated block 10. The connections between the hydraulic components are completed by the oil channels within the integrated block, eliminating all exposed pipes and achieving a more compact and reasonable structure. After passing through the dual oil filters, the pressure oil is divided into multiple groups. One group of pressure oil enters the constant-pressure chamber of the main pressure-regulating valve, which always has the force to push the main piston in the closing direction. The other group of pressure oil passes through the first servo proportional valve, the second servo proportional valve, the dual proportional valve switching valve, and the emergency stop hydraulic valve in sequence to the control chamber of the main pressure-regulating valve.

[0006] The above-mentioned dual programmable controller includes a first programmable controller and a second programmable controller, which are electrically connected to the first servo proportional valve, the second servo proportional valve and the self-centering motor device. Through programming design, it is possible to choose a redundant control mode of using the first programmable controller to control the first servo proportional valve + the second programmable controller to control the second servo proportional valve, or a redundant control mode of using the first programmable controller to control the self-centering motor device + the second programmable controller to control the second servo proportional valve, or other combinations, to achieve switching of control modes.

[0007] During operation of the aforementioned system, the dual proportional valve switching valve switches between the first and second servo proportional valves, while the motor / proportional valve switching valve switches between the proportional valves and the self-centering motor. When the motor / proportional valve switching valve loses power, the main pressure regulating valve piston is controlled by the flow rate of either the first or second servo proportional valve, controlling the proportional valve's operation. When the motor / proportional valve switching valve regains power, it automatically switches to the return-to-center position, shutting off control of the proportional valve. The self-centering motor, which remains in the center position, acts on the pilot valve, opening its operating window and driving the main pressure regulating piston back to zero. This stops the servo mechanism and maintains its current opening. To shut down the system, the handwheel or automatic reference is manually operated. The output rod of the self-centering motor moves the pilot valve spool upward, opening the pilot valve's oil return port. Oil in the main pressure regulating control chamber returns through the pilot valve, causing the main piston to move upward and shutting down the servo mechanism. To restart the system, the handwheel or automatic reference is similarly operated, opening the oil window in the pilot valve and starting the servo mechanism.

[0008] When power is lost to the speed regulator, the motor / proportional valve switching valve loses magnetism, and the speed regulator enters the proportional valve regulation state. Simultaneously, the proportional valve enters the protection position, and the main pressure regulating valve controls oil return through the proportional valve protection position. The main pressure regulating valve moves downward under the action of the constant pressure chamber, closing the relay and achieving a power-off shutdown. The emergency stop solenoid valve is connected to the proportional valve via the emergency stop hydraulic valve, enabling rapid shutdown of the speed regulator in an emergency.

[0009] The 2+3 mode described in the present invention refers to two sets of programmable controllers + 3 actuators, which can flexibly select proportional valve + stepper motor redundant control mode or dual servo proportional valve redundant control mode according to needs, and can easily cope with various fault conditions that occur during the operation of the equipment, greatly improving the reliability and control stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural principle diagram of a 2+3 mode multi-redundant speed regulation system of the utility model.

[0011] Figure 2 This is a schematic diagram of the appearance of a 2+3 mode multi-redundant speed control system of the present invention.

[0012] Figure markings: 1-double fine oil filter, 2-self-centering motor device, 3-main pressure regulating valve, 4-first servo proportional valve, 5-second servo proportional valve, 6-double proportional valve switching valve, 7-motor / proportional valve switching valve, 8-emergency stop hydraulic valve, 9-emergency stop solenoid valve, 10-hydraulic integrated block, 11-main distribution. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings. In the embodiments, unless otherwise specified, the technical means used are conventional technical means in this field.

[0014] like Figure 1 、 2 The 2+3 mode multi-redundant speed control system shown in the figure includes electrical control components and executive components. The electrical control components use dual programmable controllers, and the executive components are composed of dual fine oil filters 1, a self-centering motor device 2, a main pressure distribution valve 3, a first servo proportional valve 4, a second servo proportional valve 5, a dual proportional valve switching valve 6, a motor / proportional valve switching valve 7, an emergency stop hydraulic valve 8, an emergency stop solenoid valve 9, as well as oil pipelines, main distribution position electrical feedback and other original components. Among them, the input end of the double fine oil filter 1 is connected to the oil supply pipeline, and the output end is connected to the constant pressure chamber of the first servo proportional valve 4, the second servo proportional valve 5 and the main pressure regulating valve 3; the self-centering motor device 2 is arranged on the main pressure regulating valve 3, and is transmission-connected to the guide valve of the main pressure regulating valve 3; one end of the dual proportional valve switching valve 6 is respectively connected to the first servo proportional valve 4 and the second servo proportional valve 5, and the other end is connected to the motor / proportional valve switching valve 7; one end of the motor / proportional valve switching valve 7 is respectively connected to the dual proportional valve switching valve 6 and the self-centering motor device 2, and the other end is connected to the emergency stop hydraulic valve 8; the emergency stop hydraulic valve 8 and the emergency stop solenoid valve 9 are connected to the main pressure regulating valve 3.

[0015] In this embodiment, the main pressure-regulating valve 3 comprises a pilot valve, a constant-pressure chamber, and a control chamber. The pilot valve sleeve is integrally connected to the piston of the main pressure-regulating valve 3, providing 1:1 mechanical position feedback from the main pressure-regulating valve 3 to the pilot valve, forming a closed-loop control system in which the main pressure-regulating valve 3 follows the pilot valve. By changing the control valve group of the main pressure-regulating valve from a separate arrangement to an integrated arrangement, all hydraulic components are designed and installed on a hydraulic manifold 10. The connections between the hydraulic components are completed by oil passages within the manifold, eliminating all exposed pipes, resulting in a more compact and reasonable structure. After passing through the dual oil filter 1, the pressure oil is divided into multiple groups. One group of pressure oil enters the constant-pressure chamber of the main pressure-regulating valve 3, which always has the force to push the main piston in the closing direction. The other group of pressure oil passes through the first servo proportional valve 4, the second servo proportional valve 5, the dual proportional valve switching valve 6, and the emergency stop hydraulic valve 8 in sequence to the control chamber of the main pressure-regulating valve 3.

[0016] The dual programmable controller includes a first programmable controller and a second programmable controller, which are electrically connected to the first servo proportional valve 4, the second servo proportional valve 5 and the self-centering motor device 2. Through programming design, it is possible to choose a redundant control mode of using the first programmable controller to control the first servo proportional valve 4 + the second programmable controller to control the second servo proportional valve 5, or a redundant control mode of using the first programmable controller to control the self-centering motor device 2 + the second programmable controller to control the second servo proportional valve 5, or other combinations, to achieve switching of the control mode.

[0017] During system operation, the dual-proportional valve switching valve 6 switches between the first servo proportional valve 4 and the second servo proportional valve 5, while the motor / proportional valve switching valve 7 switches between the proportional valve and the self-centering motor device 2. When the motor / proportional valve switching valve 7 loses power, the piston of the main pressure-distributing valve 3 is controlled by the flow rate of either the first servo proportional valve 4 or the second servo proportional valve 5, achieving proportional valve operation control. When the motor / proportional valve switching valve 7 regains power, it automatically switches to the return-to-center position, disconnecting the proportional valve from operational control. The self-centering motor device 2, which remains in the center position, acts on the pilot valve, opening its operating window and driving the main pressure-distributing piston back to zero. The servomotor stops moving, maintaining its current opening. At this time, if you need to shut down the machine, you can manually operate the handwheel or automatically give a setting, and the output rod of the self-centering motor device 2 drives the valve core of the pilot valve to move upward, the oil return port of the pilot valve opens, the oil in the main control chamber returns through the pilot valve, the main piston moves upward, and the relay is closed; if you need to start the machine, similarly operate the handwheel of the self-centering motor device 2 or automatically give a setting to drive the pilot valve to open the oil window and operate the relay to start the machine.

[0018] When the speed regulator loses power, the motor / proportional valve switching valve 7 loses magnetism, and the speed regulator enters the proportional valve regulation state. Simultaneously, the proportional valve enters the protection position, and the control oil of the main pressure regulating valve 3 returns through the proportional valve protection position. The main pressure regulating valve moves downward under the action of the constant pressure chamber, and the relay closes, achieving the power-off shutdown function. The emergency stop solenoid valve 9 is connected to the proportional valve through the emergency stop hydraulic valve 8, which can quickly shut down the speed regulator in an emergency.

[0019] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the various embodiments of the present invention and are intended to be encompassed by the claims and specification of the present invention.

Claims

1. A 2+3 mode multi-redundant speed control system, comprising an electrical control component and an execution component, wherein the electrical control component adopts a dual programmable controller, characterized in that: The actuator comprises a double fine oil filter (1), a self-centering motor device (2), a main pressure regulating valve (3), a first servo proportional valve (4), a second servo proportional valve (5), a double proportional valve switching valve (6), a motor / proportional valve switching valve (7), an emergency stop hydraulic valve (8), and an emergency stop solenoid valve (9); wherein the input end of the double fine oil filter (1) is connected to the oil supply pipeline, and the output end is connected to the first servo proportional valve (4), the second servo proportional valve (5) and the constant pressure chamber of the main pressure regulating valve (3); the self-centering motor device (2) It is arranged on the main pressure regulating valve (3) and is connected to the pilot valve of the main pressure regulating valve (3); one end of the dual proportional valve switching valve (6) is respectively connected to the first servo proportional valve (4) and the second servo proportional valve (5), and the other end is connected to the motor / proportional valve switching valve (7); one end of the motor / proportional valve switching valve (7) is respectively connected to the dual proportional valve switching valve (6) and the self-centering motor device (2), and the other end is connected to the emergency stop hydraulic valve (8); the emergency stop hydraulic valve (8) and the emergency stop solenoid valve (9) are connected to the main pressure regulating valve (3).

Images