Vane follow-up system of water turbine governor

Abstract

The utility model relates to the technical field of water turbine speed regulators, and discloses a water turbine speed regulator wheel blade follow-up system which comprises a pressure tank, an oil return tank, a gate valve set, a wheel blade control valve set, a wheel blade servomotor and a filter assembly. The pressure tank is connected with the oil return tank, the pressure tank is respectively communicated with pressure oil ports of the filter assembly, the wheel blade control valve group and the gate valve group through a pressure oil pipeline P, the oil return tank is respectively communicated with oil return ports of the wheel blade control valve group and the gate valve group through an oil return pipeline T, and the outlet end of the filter assembly is communicated with the wheel blade control valve group; the gate valve set is used for receiving pressure / flow signals from an oil way of the wheel blade control valve set, so that the main valve element generates corresponding actions, and then the change of liquid flow leading to a main control working oil way of the wheel blade servomotor is controlled, so that the displacement amount of the wheel blade servomotor is controlled, and the wheel blade servomotor is used for controlling the actions of the wheel blades. The system is high in overall integration level, the problem that multiple oil leakage points are prone to occurring due to multi-point separated arrangement is solved, and the system is high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of water turbine governor technology, specifically to a water turbine governor blade follow-up system. Background Technology

[0002] The governor blade servo system is part of the overall turbine control system. It is a servo device connecting the turbine blade servo and the electrical control system, and serves as the actuator of the turbine blade control system. Axial-flow propeller turbines and through-flow turbines are commonly used turbine types in hydropower generation. During turbine operation, the blades need to be controlled in real-time via the blade servo to meet actual operational requirements. Existing turbine governor blade mechanical-hydraulic components mainly employ electro-hydraulic servoing, purely using the mechanical-hydraulic components as power amplification and servo control actuators. Actuators mainly consist of (electro-hydraulic converters or micro-motors, etc.) + main pressure regulating valves, which suffer from multi-point distribution, are prone to oil leakage, and have low reliability. Utility Model Content

[0003] The purpose of this invention is to address the above-mentioned problems by providing a turbine governor blade follow-up system. The system has a high degree of integration, solves the problem of multiple oil leakage points that are easy to occur when multiple points are arranged separately, and has high reliability.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A turbine governor blade follow-up system includes a pressure tank, a return oil tank, a slide gate valve group, a blade control valve group, a blade relay, and a filter assembly; the pressure tank is connected to the return oil tank, and the pressure tank is connected to the pressure oil ports of the filter assembly, the blade control valve group, and the slide gate valve group respectively through a pressure oil pipeline P; the return oil tank is connected to the return oil ports of the blade control valve group and the slide gate valve group respectively through a return oil pipeline T; the outlet end of the filter assembly is connected to the blade control valve group; the slide gate valve group consists of a logic slide gate valve structure composed of 4 slide gate valves, used to receive pressure / flow from the oil circuit of the blade control valve group. The signal causes the main valve core to move accordingly, thereby controlling the change in the hydraulic flow to the main control working circuit of the impeller servo, and thus controlling the displacement of the impeller servo. The Z1, Z2, and Z3 ports of the impeller control valve group are connected to the control chambers of the two slide gate valves located at the upper left and lower right, and the J1, J2, and J3 ports of the impeller control valve group are connected to the control chambers of the two slide gate valves located at the lower left and upper right. The open side A of the slide gate valve group is connected to the open chamber of the impeller servo, and the closed side B of the slide gate valve group is connected to the closed chamber of the impeller servo. The impeller servo is used to control the movement of the impeller, and the impeller servo is equipped with a displacement transmitter for feedback of the impeller servo's displacement.

[0005] Furthermore, the impeller control valve group includes three control valve groups. Each control valve group includes a quick-switching valve Z, a quick-switching valve J, and two first check valves. The first and second control valve groups also include two second check valves and a hydraulically controlled directional valve. The quick-switching valves Z and J of the first and second control valve groups are connected to the first check valves and the second check valves, respectively, and then to the hydraulically controlled directional valves. The quick-switching valves Z and J of the third control valve group are connected to the first check valves.

[0006] Furthermore, the filter assembly includes a filter element, a differential pressure transmitter, a first shut-off valve, and a second shut-off valve. The first shut-off valve, the filter element, and the second shut-off valve are connected in sequence. The differential pressure transmitter is connected in parallel with the filter element, and an exhaust valve is connected to the outlet end of the filter element.

[0007] Furthermore, the filter assembly also includes a bypass protection valve, one end of which is connected to the inlet end of the first shut-off valve, and the other end of which is connected to the outlet end of the second shut-off valve.

[0008] By adopting the above technical solution, this utility model has the following beneficial effects:

[0009] This invention features a modular design for the impeller control valve group and the slide gate valve group, resulting in a high degree of system integration. This significantly reduces the structural size of related components and solves the problem of numerous oil leakage points that were easily caused by separate multi-point layouts in the past. The system boasts high reliability and efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a turbine governor blade follow-up system according to the present invention;

[0011] Figure 2 This is a schematic diagram of the filter assembly of this utility model;

[0012] Figure 3 This is a schematic diagram of the working oil port and control oil port of the cartridge valve of this utility model;

[0013] Figure 4 This is a schematic diagram of the structure of the quick-opening valve of this utility model;

[0014] In the diagram: 1-Impeller relay, 2-Impeller control valve assembly, 21-Hydraulic directional valve, 22-First check valve, 23-Second check valve, 3-Slide valve assembly, 4-Filter assembly, 41-First shut-off valve, 42-Filter element, 43-Second shut-off valve, 44-Differential pressure transmitter, 45-Bypass protection valve, 46-Exhaust valve. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] like Figure 1 As shown, a turbine governor blade follow-up system includes a pressure tank, a return oil tank, a gate valve assembly 3, a blade control valve assembly 2, a blade servo actuator 1, and a filter assembly 4. The pressure tank is connected to the return oil tank and is connected to the pressure oil ports of the filter assembly 4, the blade control valve assembly 2, and the gate valve assembly 3 via a pressure oil pipeline P. The return oil tank is connected to the return oil ports of the blade control valve assembly 2 and the gate valve assembly 3 via a return oil pipeline T. The outlet end of the filter assembly 4 is connected to the blade control valve assembly 2. The gate valve assembly 3 consists of a logic gate valve structure composed of four gate valves, used to receive pressure / flow signals from the oil circuit of the blade control valve assembly 2, causing the main valve core to generate corresponding actions, thereby controlling the change in the fluid flow to the main control working oil circuit of the blade servo actuator 1, so as to control the displacement of the blade servo actuator. Figure 3As shown, each slide gate valve has a working port A, a working port B, and a control port K. By changing the control pressure in the K chamber, the opening degree of the main valve can be controlled. The logic cartridge control valve acts as the main control valve, which has a high degree of standardization, good interchangeability and performance consistency, low leakage, and high efficiency. The Z1, Z2, and Z3 ports of the impeller control valve group 2 are connected to the control chambers of the two slide gate valves located at the upper left and lower right, and the J1, J2, and J3 ports of the impeller control valve group 2 are connected to the control chambers of the two slide gate valves located at the lower left and upper right. The open side A of the slide gate valve group 3 is connected to the opening chamber of the impeller servo 1, and the closed side B of the slide gate valve group 3 is connected to the closing chamber of the impeller servo 1. The impeller servo 1 is used to control the movement of the impeller, and the impeller servo 1 is equipped with a displacement transmitter for feedback of the displacement of the impeller servo 1.

[0018] The impeller control valve group 2 includes three control valve groups. The first control valve group includes a quick-switching valve Z1, a quick-switching valve J1, two first check valves 22, two second check valves 23, and a hydraulically controlled directional valve 21. Quick-switching valves Z1 and J1 are sequentially connected to the first and second check valves, respectively, and then to the hydraulically controlled directional valve 1. The second control valve group includes a quick-switching valve Z2, a quick-switching valve J2, two first check valves 22, two second check valves 23, and a hydraulically controlled directional valve 2. Quick-switching valves Z2 and J2 are sequentially connected to the first and second check valves, respectively, and then to the hydraulically controlled directional valve 2. The third control valve group includes a quick-switching valve Z3, a quick-switching valve J3, and two first check valves. Quick-switching valves Z3 and J3 are respectively connected to the first check valves. Figure 4 As shown, the quick-switching valve mainly consists of a valve sleeve, an electromagnet, a control valve core, and a return spring at the end of the valve core. The electromagnet push rod controls the axial movement of the valve core within the valve body, thereby opening or closing the corresponding oil circuit. When the electromagnet HSV is de-energized, the valve core moves upward under the spring force, at which point the oil port P is connected to the control port K, while the return oil T is closed to the control port K. When the electromagnet HSV is energized, the valve core moves downward under the push force of the electromagnet push rod, at which point the oil port P is closed to the control port K, while the return oil T is connected to the control port K. By pulse modulation through the on / off signal of the quick-switching valve, i.e., by controlling the pulse frequency and pulse width, near-continuous control of flow or pressure can be achieved, thus playing the role of "electro-hydraulic conversion". Therefore, by controlling the on / off state of the quick-switching valve, the connection or disconnection of the oil circuit can be controlled, thereby controlling the switching of the hydraulic directional valve, thus connecting the high-speed control valve group to the upper left and lower right slide gate valves or the lower left and upper right slide gate valves, so that the open side A or the closed side B of the slide gate valve group 3 can pass through the impeller servo 1 to the open chamber or the closed chamber, thereby realizing the control of the displacement of the impeller servo 1.

[0019] like Figure 2As shown, the filter assembly 4 includes a filter element 42, a differential pressure transmitter 44, a first shut-off valve 41, a second shut-off valve 43, and a bypass protection valve 45. The first shut-off valve 41, filter element 42, and second shut-off valve 43 are connected in sequence, and the differential pressure transmitter 44 is connected in parallel with the filter element 42. One end of the bypass protection valve 45 is connected to the inlet end of the first shut-off valve 41, and the other end of the bypass protection valve 45 is connected to the outlet end of the second shut-off valve 43. An exhaust valve 46 is connected to the outlet end of the filter element 42. If the filter element 42 is clogged, the indicator light on the differential pressure transmitter 44 will illuminate, and the red indicator button on the transmitter will protrude, indicating that the filter element 42 is clogged and needs to be replaced. During the replacement process, first close the first shut-off valve 41 and the second shut-off valve 43, then unscrew the filter cartridge, remove the filter element 42, replace it with a new filter element 42, then open the first shut-off valve 41, while the second shut-off valve 43 remains closed; vent through the vent valve 46, and after venting is complete, restore the vent valve 46 to its original state; then open the second shut-off valve 43.

[0020] In use, when the speed controller's control signal energizes or de-energizes the quick-switching valves (Z1, Z2, Z3) and the fast-switching valves (J1, J2, J3), the hydraulic directional valve switches to the right or left position. This connects the Z1, Z2, Z3 ports or J1, J2, J3 ports of the impeller control valve group 2 to the control chambers of the upper left and lower right slide gate valves or the lower left and upper right slide gate valves. This allows the open side A or the closed side B of the slide gate valve group 3 to pass through the impeller servo motor 1 to the open or closed chamber, thereby controlling the displacement of the impeller servo motor 1.

[0021] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A turbine governor blade follow-up system, characterized in that: The system includes a pressure tank, a return oil tank, a gate valve assembly, a blade control valve assembly, a blade relay, and a filter assembly. The pressure tank is connected to the return oil tank and is connected to the pressure oil ports of the filter assembly, the blade control valve assembly, and the gate valve assembly via a pressure oil pipeline P. The return oil tank is connected to the return oil ports of the blade control valve assembly and the gate valve assembly via a return oil pipeline T. The outlet end of the filter assembly is connected to the blade control valve assembly. The gate valve assembly consists of four gate valves forming a logic gate valve structure, used to receive pressure / flow signals from the oil circuit of the blade control valve assembly, causing the main valve core to generate corresponding actions, thereby controlling the flow. The change in hydraulic flow in the main control working circuit of the blade servo actuator controls the displacement of the blade servo actuator. The Z1, Z2, and Z3 ports of the blade control valve group are connected to the control chambers of the two slide gate valves located at the upper left and lower right. The J1, J2, and J3 ports of the blade control valve group are also connected to the control chambers of the two slide gate valves located at the lower left and upper right. The open side A of the slide gate valve group is connected to the open chamber of the blade servo actuator, and the closed side B of the slide gate valve group is connected to the closed chamber of the blade servo actuator. The blade servo actuator is used to control the movement of the blades, and a displacement transmitter is provided on the blade servo actuator to provide feedback on the displacement of the blade servo actuator.

2. The turbine governor blade follow-up system according to claim 1, characterized in that: The impeller control valve group includes three control valve groups. Each control valve group includes a quick-switching valve Z, a quick-switching valve J, and two first check valves. The first control valve group and the second control valve group also include two second check valves and a hydraulically controlled directional valve. The quick-switching valves Z and J of the first and second control valve groups are connected to the first check valves and the second check valves in sequence, respectively, and then to the hydraulically controlled directional valves. The quick-switching valves Z and J of the third control valve group are connected to the first check valves.

3. The turbine governor blade follow-up system according to claim 1, characterized in that: The filter assembly includes a filter element, a differential pressure transmitter, a first shut-off valve, and a second shut-off valve. The first shut-off valve, the filter element, and the second shut-off valve are connected in sequence. The differential pressure transmitter is connected in parallel with the filter element. An exhaust valve is connected to the outlet end of the filter element.

4. The turbine governor blade follow-up system according to claim 3, characterized in that: The filter assembly also includes a bypass protection valve, one end of which is connected to the inlet end of the first shut-off valve, and the other end of which is connected to the outlet end of the second shut-off valve.

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