CN219197754U - Speed regulator control valve block for water turbine - Google Patents

Abstract

The utility model belongs to the field of speed regulators, and particularly relates to a speed regulator control valve block for a water turbine, which is provided with an electric regulating mechanism, a hydraulic follow-up mechanism and a high-pressure oil pressure mechanism, wherein the electric regulating mechanism plays a role in intelligent automatic regulation, the hydraulic follow-up mechanism plays a role in executing regulation, the high-pressure oil pressure mechanism plays a role in providing energy, and the 3 mechanisms mutually play roles through sensors and set various parameters through a unit in the mechanisms for running. The speed regulator is a high oil pressure and full digital programmable combined speed regulator, has high adaptability, stability and reliability, overcomes the performance influence of oil pressure fluctuation, temperature difference interference, oil pollution and the like on the speed regulator, and has miniaturized, integrated and standardized machine type.

Description

Speed regulator control valve block for water turbine

Technical Field

The utility model belongs to the technical field of regulators, and particularly relates to a speed regulator control valve block for a water turbine.

Background

In the power supply process of the hydropower station, the safety and the reliability of power supply are ensured, and the stability of power supply voltage and frequency is also ensured. In a specific operation, after the power load changes, the voltage and the frequency of the power supply system also change. At this time, the generator can be voltage-regulated, and the frequency is regulated by a speed regulator of the water turbine.

The speed regulator of the water turbine is taken as an important component part of the water turbine, is one of very important auxiliary control equipment of the water turbine generator set, directly determines the safe and stable operation of the set according to the operation quality of the water turbine, and is a key part for realizing the adjustment of the water turbine. In order to ensure the normal operation of the water turbine and accordingly ensure the normal and stable operation of the hydropower station, the water turbine speed regulator generally has two functions: grid-connected function and regulation function. The grid-connected function is an important condition for realizing automatic adjustment of the running state of the water turbine. In the normal operation process of the water turbine, a worker sends an operation state adjustment instruction to the water turbine through a computer, and then the grid-connected function of the water turbine speed regulator can automatically adjust the operation state of the water turbine according to the related instruction, so that the stable operation of the water turbine is guaranteed. The regulating function is used as the main function of the water turbine speed regulator, and also is a function for reflecting the value of the water turbine speed regulator, and the regulating function is used for regulating the running speed, water flow, power and the like of the water turbine. In the running process of the water turbine, a worker can adjust the rotating speed, the power, the water flow and the like of the water turbine to proper values by utilizing the adjusting function of the speed regulator according to the requirements, so that the running safety and stability of the water turbine are ensured, and further, the safety and stable running of the hydropower station are ensured.

Hydraulic governor the hydraulic governor of the hydraulic governor produced at the end of the 19 th century, and experienced a long history of the development of mechanical hydraulic governors to electro-hydraulic governors. Currently, the speed regulator used in hydropower stations comprises various structural forms of speed regulators such as YT (mechanical hydraulic speed regulator), YDT (electric hydraulic speed regulator), YWT (microcomputer hydraulic speed regulator), BW (S) T-PLC (oil-free electric-rotating programmable microcomputer speed regulator B stepping motor W microcomputer S double-regulation T speed regulator), BLWST-PLC (servo proportional valve programmable microcomputer speed regulator B proportional servo valve L digital logic W microcomputer S double-regulation), high oil pressure GLYWT-PLC (logic digital valve, hydraulic microcomputer speed regulator) and the like according to the system components.

The mechanical hydraulic speed regulator YT is the basis of a modern speed regulator, the rotation speed deviation and hydraulic conversion of the unit are completed by utilizing a centrifugal pendulum and a guide valve, the guide valve and an auxiliary servomotor form a first-stage hydraulic amplification, and the auxiliary servomotor and a main pressure distribution valve form a second-stage hydraulic amplification so as to operate the servomotor to control the opening of a guide vane. The piston rod of the auxiliary servomotor is provided with two on-off time adjusting nuts, the upper nut controls the off time, and the lower nut controls the on time. With the increase of the capacity of the power grid, the requirements on the frequency of the power grid are more strict, the mechanical speed regulator cannot meet the requirements, and meanwhile, the mechanical speed regulator is complex in structure, high in manufacturing cost and high in difficulty.

The electric hydraulic speed regulator YDT adopts an electric loop to replace mechanical components such as centrifugal pendulum, buffer and the like, the dead zone of the speed regulator is changed from 0.18% of the mechanical hydraulic speed regulator to not more than 0.08%, the dead time of the servomotor is changed from 0.4S to not more than 0.3S, the parameter adjustment and the operation mode switching can be rapidly and reliably realized, and the advantages of a computer, remote operation and the like can be realized. However, the hydraulic turbine speed regulating system is a nonlinear time-varying system, and it is very difficult for the mechanical hydraulic speed regulator and the electric hydraulic speed regulator to ensure that the speed regulating system has excellent dynamic quality under different working conditions.

Along with the development of hydraulic technology and computers in other industrial fields, the regulation rule in the microcomputer hydraulic speed regulator YWT is realized by a software program, the PI and PID regulation rule can be realized, the adjustment and modification of regulation parameters are convenient, and the inquiry and conversion of the running state are flexible; the logical relation among various running operations can be completed by using software programming, so that a corresponding relay loop is canceled, the cost is reduced, and the controllability is improved; the method is favorable for realizing the comprehensive control of the hydropower station, improves the automation level of the hydropower station, or has good effects as other microcomputer speed regulators. The servo system of microcomputer speed regulator basically adopts electrohydraulic servo system, electrohydraulic proportional servo system or motor servo system, etc.

However, since the hydropower station is in a relatively high humidity, the temperature difference between winter and summer of many hydropower stations is large, the influence on the stability of the speed regulator of the microcomputer servo system is constant, and the zero point adjustment is often needed to be carried out on the speed regulator, the technical problems that the stability and the reliability of the speed regulator of the water turbine are not fundamentally solved and the speed regulator is easy to lose efficacy still exist, and if an electrohydraulic servo valve is adopted, the system has the technical problems of high control precision, good dynamic response characteristic, high requirements on the quality of environment and oil and the like as the electrohydraulic servo valve is adopted.

The utility model CN201320220878.7 describes a multifunctional and variable digital speed regulator combined valve block, which comprises a full digital speed regulator with a sectional closing function, wherein the full digital speed regulator consists of a first two-position four-way electromagnetic reversing valve, a first electromagnetic ball valve, a second electromagnetic ball valve, a third electromagnetic ball valve, a first cartridge valve, a second electromagnetic ball valve, a third electromagnetic ball valve, a fourth cartridge valve, a fifth cartridge valve and a first two-position three-way electromagnetic valve, a servomotor hydraulic locking function part consists of a second two-position four-way electromagnetic reversing valve and a hydraulic control one-way valve, and the full digital speed regulator is integrated in a first integrated block; and integrating a second two-position four-way electromagnetic reversing valve in the hydraulic locking function part into a third integrated block. Although the standardization, miniaturization and integration of the hydropower industry are improved, the reliability stability and the like are improved in function, the technical problems that the control is complex and the control is easy to be interfered by external influence still exist, the traditional other speed regulator combined valve blocks are poor in anti-interference capability and have certain floating dispersion and stability.

After nineties, the hydropower industry has advanced in high count, and the electric part of the electro-hydraulic speed regulator is almost synchronously developed with the electronic technology due to the fact that new technology and new products of the electronic industry are timely applied, and the electric control of the speed regulator is often applied to the speed regulator soon. However, the hydraulic part of the electro-hydraulic governor is basically in a stagnation state, and there is a great gap with the modern hydraulic technology, for example, as with the mechanical hydraulic governor in the past of the last few decades, the hydraulic element still adopts a single-piece, small-batch production mode, such as: an unloading valve, a main distributing valve and the like. The working oil pressure is maintained at a 2.5Mpa 4.0Mpa 6.3Mpa low-pressure level, and the oil pressure device adopts a pressure tank form of oil-gas contact, so that the speed regulator is poor in stability and high in failure rate; poor adjustment accuracy is also a common problem of current speed regulators.

In addition, the speed regulator system formed by adopting the traditional analogue signal control elements such as the proportional valve, the servo valve and the like generally realizes digital control through D/A conversion, which is the main form of the currently operated speed regulator system equipment. This method has the following disadvantages: because the controller is provided with the analog circuit, temperature drift and zero-section are easy to generate, the system is easy to be influenced by temperature change, and meanwhile, the controller is difficult to realize thorough compensation on nonlinear factors of the hydraulic valve, such as dead zones, hysteresis loops and the like; the D/A interface conversion circuit is added, and the proportional electromagnet and the torque motor for driving the proportional valve and the servo valve have inherent hysteresis, so that the external control characteristic of the hydraulic control valve shows 2-8% hysteresis, and the technical problems of poor control characteristic and the like are solved.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a speed regulator control valve block for a water turbine, which is a high-oil-pressure all-digital programmable combined speed regulator, has attractive appearance, simplified system structure, high model standardization integration level and convenient maintenance operation; the performance influence of oil pressure fluctuation, temperature difference interference, oil pollution and the like on the speed regulator is overcome, the performance of the speed regulator such as dead zone of rotating speed, resolution ratio, nonlinearity degree and the like are obviously superior to the standard, and the adaptability, stability, reliability and disturbance resistance of the speed regulator are greatly improved, and the adjustment precision is high.

The utility model solves the technical problems, and the speed regulator control valve block for the water turbine is characterized in that: the intelligent hydraulic control system is provided with an electric control mechanism, a hydraulic follow-up mechanism and a high-pressure oil pressure mechanism, wherein the electric control mechanism plays an intelligent automatic control role, the hydraulic follow-up mechanism plays an executing and adjusting role, the high-pressure oil pressure mechanism plays a role in providing energy, and the 3 mechanisms mutually play roles through sensors and set various parameters for running through a unit in the mechanisms.

The hydraulic servo mechanism controls the high-pressure oil pressure mechanism through a sensor. The electric regulating mechanism and the hydraulic follow-up mechanism have strong practicability and intelligence, and the regulation and control of the electric regulating mechanism and the hydraulic follow-up mechanism can realize the real-time monitoring and follow-up regulation and control of the states of the hydraulic element and the sensing element.

The high-pressure oil pressure mechanism comprises an oil pump motor group and an integrated oil path block, wherein the integrated oil path block is provided with an oil return tank and an energy storage gas group, and the oil pump motor group and the energy storage gas group are respectively arranged on two side surfaces of the oil return tank; the bottom end of the oil pump motor unit is provided with a pressure hydraulic control valve group; the pressure hydraulic control valve group, the oil pump motor group and the oil return box are connected into a whole through an oil pipeline, and the energy storage gas group is connected with the oil return box through the pressure oil pipeline.

The high-pressure oil pressing mechanism supplies pressure oil to the speed regulator and transmits operation force. The high oil pressure of the speed regulator in operation comes from the energy storage gas group, the oil at the low pressure side enters the oil return tank through the oil return pipeline, and the pressure hydraulic control valve group plays a role in monitoring and regulating and controlling the pressure value.

The electric regulating mechanism is a PLC controller, namely an electric regulating system with a PLC as a core.

In the concrete structure, the speed regulator control valve block is provided with an energy storage gas group, a PLC control cabinet, a digital hydraulic control valve group, an oil return tank, an oil pump motor group and a pressure hydraulic control valve group in parallel, wherein the energy storage gas group and the oil pump motor group are respectively arranged on two sides of the oil return tank, the PLC control cabinet and the digital hydraulic control valve group are arranged on the upper surface of the oil return tank, and the pressure hydraulic control valve group is arranged at the bottom end part of the oil pump motor group; the PLC controller is arranged in the PLC control cabinet.

The hydraulic servo mechanism comprises a digital hydraulic control valve group.

The digital hydraulic control valve group is provided with a hydraulic control valve main body, the front surface of the hydraulic control valve main body is provided with an oil return interface and an oil supply interface, both sides of the hydraulic control valve main body are provided with a small fluctuation combined control valve group and a large fluctuation logic cartridge valve group, the top of the hydraulic control valve main body is provided with a large fluctuation hydraulic control valve group and a large fluctuation logic cartridge valve group, and one side of the hydraulic control valve main body is provided with a hydraulic locking control piece above the small fluctuation combined control valve group; the small fluctuation combined control valve group, the large fluctuation logic cartridge valve group, the large fluctuation hydraulic control valve group and the hydraulic locking control piece are connected with the hydraulic control valve main body by adopting integrated valve blocks. The system is regulated by a combination of on-off digital logic, replaces the middle position regulation of a main distribution valve, has stable operation and high regulation quality, reduces the workload of system regulation and is convenient to regulate.

The utility model adopts a logic cartridge valve in large fluctuation and combines a limiter, so that an optimal operation curve can be adjusted, the requirement of quick response is met, hydraulic impact and fluctuation can be controlled within a certain range, and the high responsiveness and stability of the system are greatly enhanced. The small fluctuation control adopts a high-speed digital ball valve, and the control has the characteristic of minimum hysteresis through PWM modulation of a control signal, so that the requirements of quickly and accurately controlling the position of the servomotor can be met, and the full closed loop control is formed on the servomotor through a high-precision displacement sensor, so that the double requirements of precision and response speed are considered.

The PLC control cabinet and the digital hydraulic control valve group are integrated in parallel and arranged on the upper surface of the oil return tank, and the PLC is an electric control part and is fixed on the upper surface of the oil return tank through screws.

The bottom end of the digital hydraulic control valve bank is provided with a support, and the digital hydraulic control valve bank is connected with the oil return tank into a whole through the support.

In the optimization scheme, the energy storage gas group is a high-pressure bag type energy accumulator, and the bag type energy accumulator is used for storing energy, so that oil and gas are separated, oil quality is not easy to degrade, nitrogen is not easy to leak, the energy storage gas group can be operated for a long time, a high-pressure air system and a corresponding auxiliary factory building can be omitted from a power station, and the economical efficiency is greatly improved.

The high-pressure bag-type energy accumulator is formed by connecting N bag-type energy storage tanks in parallel.

The operating oil pressure of the high-pressure oil pressing mechanism is less than or equal to 25MPa, the oil pressure in the optimization scheme is 10-25MPa, and the oil pressure in the further optimization scheme is 10-16MPa.

The utility model selects higher working oil pressure, which is the main characteristic of the high oil pressure water turbine speed regulator, solves the technical problems of large volume and large oil consumption of the traditional water turbine speed regulator and oil pressure device, such as low working oil pressure, high price screw pump and non-standard hydraulic elements for small batch production. Various advanced and standard hydraulic element products in the hydraulic industry are comprehensively adopted, and in the aspect of oil pressure devices, a high-pressure gear pump replaces a screw pump, so that the hydraulic pump has the advantages of stable performance, low cost and obvious price advantage, a bag-type energy accumulator replaces an air compressor system, and the system pressure is greatly improved.

The oil supply mode in the high-pressure oil pressure mechanism is a main pump and standby pump double-system oil supply mode, namely, the oil pump motor group is provided with a main pump and a standby pump, and the pressure hydraulic control valve group is arranged between the main pump and the standby pump. The main pump and the standby pump are connected in parallel or independently and are mutually standby. Each oil pump is provided with a combination valve, such as a safety valve, a check valve, a manual valve and the like. The pressure hydraulic control valve group is also provided with a pressure switch, a pressure gauge and the like, and accessories are conventionally arranged. Thereby continuously generating pressure oil for supplying to the speed regulating operation system water-guiding mechanism. The hydraulic pressure control system can also be provided with a conventional low-pressure annunciator, an emergency stop electromagnetic valve and other parts such as a monitoring instrument, an indicator, a tachometer, a pressure gauge, an oil filter, a motor, an overflow valve, an oil pipeline and the like.

In a further optimization scheme, the integrated valve blocks in the digital hydraulic control valve group, namely the size fluctuation integrated valve blocks are provided with manual emergency operation ports, and emergency operation can be performed when a control system is in fault.

Each integrated block electromagnetic valve in the digital hydraulic control valve group, namely the size fluctuation hydraulic control valve group and the logic cartridge valve are respectively provided with a square plug with a lamp, so that the running state of the electromagnetic valve is visible in real time.

The digital hydraulic control valve group is also provided with an emergency shutdown valve which is a two-position three-way electromagnetic reversing valve and is used for controlling the large-fluctuation hydraulic control valve group and the hydraulic control shuttle valve.

The main controller adopts the PLC controller, has the characteristics of high reliability, flexible hardware module configuration, strong communication networking capability and the like, can realize automatic power generation control (AGC) of the generator set by being matched with other control equipment of the power plant, is suitable for unattended and unattended power stations, and has strong communication function suitable for remote centralized control. The electrohydraulic conversion link adopts a digital ball valve, the hydraulic system adopts a standard hydraulic element, the structure is simplified, the interchangeability and maintainability are improved, the digital valve has strong pollution resistance, high pressure resistance, no leakage and reliable action, and zero point adjustment is not needed. The electrohydraulic follow-up system in the speed regulator is characterized in that the control ring of the digital ball valve is used for operating the oil cylinder to directly drive the servomotor, no mechanical transmission lever is arranged in the middle of the electrohydraulic follow-up system, so that full digital control is truly realized, and the control precision and reliability are greatly improved.

The utility model relates to a high-performance hydraulic turbine speed regulator, which is an all-digital speed regulator, adopts a high-reliability microcomputer processing system, takes PLC as a core, utilizes ASIC (application specific integrated circuit) technology to realize detection of machine frequency and network frequency, and transmits displacement of an operating cylinder into the ASIC for measurement through voltage/frequency (V/F) conversion, thereby effectively improving the reliability of a frequency measurement and detection feedback part of the speed regulator.

The hydraulic element adopts the digital logic on-off oil way, and can realize various special working conditions through the on-off of different components, so that the application range of the device is greatly expanded, and the valve group logic can be changed through electric control under the condition that hardware is not changed, thereby being applicable to different working conditions and different tasks and avoiding repeated investment and waste of investment.

The valve block has a perfect fault tolerance and fault handling system, namely, the main pump and the standby pump are used simultaneously, when a non-fatal fault occurs in the speed regulating system, the device can still operate in a fault tolerance mode, and under the fault condition, the valve block can drive the servomotor to close the guide vane in an emergency mode through the fault maintaining function of the device or changing the operation mode, so that the safety of the unit is protected at the first time.

The utility model has the advantages that the machine type is miniaturized, integrated and standardized, the requirements on oil quality are very low, the application range of the digital electromagnetic valve and the logic cartridge valve on the oil quality is wide, the occurrence probability of blocking is greatly reduced, meanwhile, the problems of refusal action, card sending, oil leakage, large oil consumption, poor static performance and dynamic quality and the like are solved by arranging the high-pressure hydraulic press, the utility model can be suitable for the adjustment and control of a medium-sized and small-sized hydroelectric generating set, the reliable work can reach more than 30 ten thousand hours, and the technical index such as the dead zone of the rotating speed is 0.0027 percent, which is better than the national standard 0.06 percent; the resolution is 0.0005Hz, which is far superior to the standard (standard < 0.003 HZ); the nonlinearity is 0.128%, which is better than the standard (standard < 0.25%). In the load shedding process, the fluctuation times deviating from the steady-state rotating speed by more than 3% are not more than 1 time, and the guide vane opening adjustment time is less than 30s.

Drawings

FIG. 1 is a schematic diagram of a control valve block of a speed governor according to the present utility model

FIG. 2 is a schematic diagram of the digital hydraulic control valve set of FIG. 1 according to the present utility model

FIG. 3 is a right side view of FIG. 1 in accordance with the present utility model

FIG. 4 is a top view of FIG. 1 of the present utility model

FIG. 5 is a back view of FIG. 1 of the present utility model

FIG. 6 is a schematic diagram of the operation of the governor system of the present utility model

FIGS. 7 and 8 are partial views of FIG. 6 of the present utility model

FIG. 9 is a block diagram of a large wave logic cartridge valve set socket according to the present utility model

FIG. 10 is a schematic view of a square plug with a lamp according to the present utility model

FIG. 11 is a schematic diagram showing various switch valve structures in the present utility model

Fig. 12-16 are schematic views of the internal structure of the digital hydraulic control valve set according to the present utility model

The specific identification in the figure is as follows:

1. the hydraulic control system comprises an energy storage gas group, 2.PLC controller, 3.digital hydraulic control valve group, 4.oil return tank, 5.oil pump motor group, 6.pressure hydraulic control valve group, 7.large fluctuation hydraulic control valve group, 8.hydraulic locking control valve group, 9.small fluctuation combination control valve group, 10.large fluctuation logic cartridge valve group, 11.oil return port, 12.oil supply port, 13.bracket, 14.small fluctuation closing, 15.small fluctuation opening, 16.small fluctuation opening time adjustment, 17.small fluctuation closing time adjustment, 18.segmented closing valve, 19.large fluctuation closing, 20.large fluctuation opening, 21.emergency closing auxiliary valve, 22.large fluctuation closing time adjustment, 23.large fluctuation opening time adjustment, 24.emergency closing valve, 25.oil pipeline, 26.pressure oil pipe, 27.hydraulic control valve main body, 28.oil filter, 29.motor, 30.overflow valve, 31.pressure gauge, 32.stop valve, 33.valve core, 34.hydraulic control shuttle valve, 35.oil cavity, A.working A, B.working oil cavity B, K and K control valve direction of the direction of opening and closing direction of the oil cavity

Detailed Description

The utility model is further illustrated by the following description of specific embodiments:

example 1

A speed regulator control valve block for hydraulic turbine is equipped with electric adjustment mechanism, hydraulic servo mechanism and high-pressure oil pressure mechanism, electric adjustment mechanism plays intelligent automatically regulated effect, hydraulic servo mechanism plays the execution regulation effect, high-pressure oil pressure mechanism plays the energy and provides the effect, 3 mechanisms are mutually through the sensor effect to set up each kind of parameter through the unit in the mechanism and operate.

The hydraulic servo mechanism controls the high-pressure oil pressure mechanism through a sensor. The electric regulating mechanism and the hydraulic follow-up mechanism have strong practicability and intelligence, and the regulation and control of the electric regulating mechanism and the hydraulic follow-up mechanism can realize the real-time monitoring and follow-up regulation and control of the states of the hydraulic element and the sensing element. The high-pressure oil pressing mechanism supplies pressure oil to the speed regulator and transmits operation force. The high oil pressure of the speed regulator in operation comes from the energy storage gas group, the oil at the low pressure side enters the oil return tank through the oil return pipeline, and the pressure hydraulic control valve group plays a role in monitoring and regulating and controlling the pressure value.

The high-pressure oil press mechanism is provided with an oil pump motor group and an integrated oil way block, the integrated oil way block is provided with an oil return tank and an energy storage gas group, and the oil pump motor group and the energy storage gas group are respectively arranged on two sides of the oil return tank; the bottom end of the oil pump motor unit is provided with a pressure hydraulic control valve group; the pressure hydraulic control valve group, the oil pump motor group and the oil return box are connected into a whole through an oil pipeline, and the energy storage gas group is connected with the oil return box through the pressure oil pipeline.

The pressure hydraulic control valve group mainly keeps the pressure and the liquid level of the pressure tank in a normal working range, and meanwhile, the oil level of the oil return tank is kept. The oil pump control device can receive the oil pump start and stop instructions, and can also output sampling values such as pressure, liquid level, oil pump motor current and the like, signals such as accident low oil pressure and the like to other IEDs.

The electric regulating mechanism is a PLC controller, namely an electric regulating system with a PLC as a core.

Specifically, the speed regulator control valve block is equipped with energy storage gas group, PLC controller, digital liquid accuse valves, oil return tank, oil pump motor group and pressure liquid accuse valves, and energy storage gas group and oil pump motor group establish in oil return tank side, and PLC switch board and digital liquid accuse valves are established in oil return tank upper surface side by side, and pressure liquid accuse valves are established at oil pump motor group bottom end, and pressure liquid accuse valves, oil pump motor group and oil return tank pass through the oil pipe and are connected. The PLC controller cabinet is fixed on the oil return tank through a screw, and the energy storage gas group is connected with the oil return tank through a pressure oil pipe.

The hydraulic servo mechanism is provided with a digital hydraulic control valve bank, the digital hydraulic control valve bank is provided with a hydraulic control valve main body, the front surface of the hydraulic control valve main body is provided with an oil return interface and an oil supply interface, two sides of the hydraulic control valve main body are provided with a small fluctuation combined control valve bank and a large fluctuation logic cartridge valve bank, the top of the hydraulic control valve main body is provided with a large fluctuation hydraulic control valve bank and a large fluctuation logic cartridge valve bank, one side of the hydraulic control valve main body is provided with a hydraulic locking control piece above the small fluctuation combined control valve bank, and the PLC control cabinet is connected with the oil return interface through a pipeline. The main body structure of the hydraulic control valve is conventionally arranged.

The large-fluctuation logic cartridge valve group is provided with a control cover plate, a valve sleeve, a valve core, a sealing piece and the like, the cartridge block body and the pilot element are conventionally arranged on the control cover plate, and the control cover plate is fixedly connected with the hydraulic control valve main body through a bolt structure. The plug-in unit composed of valve sleeve, valve core and sealing element mainly has the function of controlling on and off in the loop. The control cover plate seals the plug-in unit in the plug-in block body and communicates the pilot valve and the plug-in unit. The on-off of the main oil way can be controlled by the opening and closing of the valve core.

The small fluctuation combined control valve group, the large fluctuation logic cartridge valve group, the large fluctuation hydraulic control valve group and the hydraulic locking control piece are connected with the hydraulic control valve main body in an integrated valve block mode. The small fluctuation combined control valve group is used for small disturbance control of a unit, the large fluctuation logic cartridge valve group is used for emergency starting and normal switching of the unit, the large fluctuation hydraulic control valve group is used for load shedding and other adjustment, and the hydraulic locking control piece is used for preventing misoperation. The oil return interface is connected with the T port and communicated with the oil return tank; the oil supply interface is connected with the P port and is connected with the working A/B cavity through the control valve group.

The small fluctuation combined control valve group is a high-speed digital valve group, and the model of the product is 3SEW6/10-UK/CK. The model of the large fluctuation logic cartridge valve group, the large fluctuation hydraulic control valve group and the hydraulic locking control piece is HYFK-40/50.

The logic cartridge valve is adopted for large fluctuation, and the limiter is combined, so that an optimal operation curve can be adjusted, the requirement of quick response is met, hydraulic impact and fluctuation can be controlled within a certain range, and the high responsiveness and stability of the system are greatly enhanced. The small fluctuation control adopts a high-speed digital ball valve, the control signal PWM is modulated, namely, the opening degree (controlled quantity) of a guide vane is converted by V/F and then is fed into the counting, 0-10V corresponds to 0-100 KHzd frequency, the counting time is 10ms, the digital control quantity with the precision of +/-0.2, such as the modulation of pulse frequency and pulse width, can be obtained, the control has the characteristic of extremely small hysteresis, the requirement of rapidly and accurately controlling the position of a servomotor can be met, the high-precision displacement sensor is adopted, namely, a resistance ruler KTC series pull rod type displacement sensor is adopted to achieve the feedback of high-precision displacement and the precision grade of 0.01%, the servomotor forms the full-closed loop control, and the double requirements of precision and response speed are considered.

A digital speed regulator based on a quick switch valve and a logic cartridge valve component is characterized in that the logic cartridge valve is used as a single control liquid resistor, so that the traditional hydraulic control basic combination can be further divided into two controllable liquid resistors and a hydraulic half-bridge with a controlled cavity combination, and the problems of the existing water turbine speed regulator are solved: refusing movement, sending card, leaking oil, large oil consumption, poor static performance and dynamic quality. The method has the characteristics of obvious energy saving, consumption reduction, life prolonging and the like, and provides technical guarantee measures for people reduction and synergy of the hydropower station.

The oil supply interface and the oil return interface are fixedly connected with the hydraulic control valve main body through oil pipes, and other parts of the large fluctuation hydraulic control valve group, the hydraulic locking control piece, the small fluctuation combined control valve group and the large fluctuation logic cartridge valve group.

The high-pressure oil pressure mechanism is a high-pressure bag type energy accumulator, and the energy is stored by the bag type energy accumulator, so that oil and gas are separated, the oil quality is not easy to deteriorate, nitrogen is not easy to leak, the high-pressure oil pressure mechanism can run for a long time, a high-pressure air system and a corresponding auxiliary workshop can be omitted from a power station, and the economical efficiency is greatly improved. The high-pressure oil pressure mechanism operates the oil pressure to be less than or equal to 25MPa, and the oil supply mode in the oil pressure device is a main pump and standby pump double-system oil supply mode.

The large-fluctuation logic cartridge valve group is suitable for high pressure and large flow; the working medium has wide application range and can realize leakage-free control; the system has the characteristics of large flow and low liquid resistance, is high in system efficiency, has the characteristics of quick opening and closing, and can control the switching characteristic; the flow control characteristic is good, the pollution resistance is strong, the performance is reliable, and the service life is long.

The speed regulator valve block of the utility model replaces the traditional electrohydraulic servo valve, the proportional valve or the stepping motor, the traditional main distributing valve and the like with the standard hydraulic elements such as the digital electromagnetic valve, the logic cartridge valve and the like respectively, and is matched with a computer monitoring system to bear the control tasks of the opening degree of the guide vane of the unit, the frequency of the unit, the power of the unit and the like. The digital intelligent speed regulator is stable and has no discrete property, the standard control capability of the programmable logic controller is provided in the application process, the reliability is high, the expansion is easy, the operation capability is strong, the timeliness is good, the programming is convenient, the switching value and the analog value are conveniently processed, and the loop regulation is well carried out.

The above structures or components, and the specific connection modes not mentioned, are conventional structures and conventional connection modes, such as connection through lines, integrated blocks, oil pipes, and the like.

Example 2

As shown in fig. 1-5, the structure of the embodiment is based on embodiment 1, the high-pressure oil pressing mechanism is a high-pressure bag type accumulator, the highest operating oil pressure is 25MPa, and the hydraulic system strictly meets the industry standard. The oil supply mode in the oil pressure device is a double-system oil supply mode of a main pump and a standby pump. The speed regulator controls the high-pressure oil pressure mechanism through hydraulic pressure, and the pressure system is an automatic pressure maintaining type oil pressure device. The oil supply mode of the main pump and the standby pump is adopted, the main pump and the standby pump are mutually standby, when one pump fails, the system is automatically switched to the standby pump, and the damaged pump set can be safely replaced or maintained under the condition of no power failure and no shutdown. The method is suitable for small and medium mixed flow type, through flow type, axial flow type and impact type hydroelectric generating sets.

When the oil pressure is reduced to the lower limit of the normal working oil pressure, the oil pump is started automatically, the oil in the oil return tank is pumped into the standard accumulator, and the oil pressure reaches the upper limit of the normal working oil pressure, so that the oil pump stops working.

The digital hydraulic control valve bank is provided with a hydraulic control valve body, a large fluctuation hydraulic control valve bank, a hydraulic locking control valve, a small fluctuation combined control valve bank and a large fluctuation logic cartridge valve bank in parallel, an oil return interface and an oil supply interface are arranged on the front side face of the digital hydraulic control valve bank, the large fluctuation logic cartridge valve bank is arranged on the left side face and the right side face of the hydraulic control valve body and the upper surface of the hydraulic control valve body, the large fluctuation hydraulic control valve bank is arranged on the upper surface of the hydraulic control valve body, the hydraulic locking control valve bank and the small fluctuation combined control valve bank are arranged on the same side face of the hydraulic control valve body, the hydraulic locking control valve bank is arranged above the small fluctuation combined control valve bank, and the PLC control cabinet is connected with the oil return interface through a pipeline. The bottom end of the digital hydraulic control valve group is provided with a support, and the digital hydraulic control valve group is connected with the oil tank into a whole through the support. The small fluctuation combined control valve group is a high-speed digital ball valve, and the operation time is less than 25ms. As shown in fig. 2, 12-16.

The small fluctuation combined control valve group and the large fluctuation logic cartridge valve have certain specific pressure, the specific pressure is a linear seal of 31-33 Mpa, the sealing performance is good, the pressure drop rate of the oil pressure device is small, the starting times of the oil pump is obviously reduced, the pressure maintaining time is 4-6 hours in the working range of the speed regulator under 13.5-16.5 Mpa, and the pressure maintaining time is more than 25 times of that of the traditional speed regulator with the main valve structure, and the pressure maintaining device has obvious energy saving effect.

The logic cartridge valve can be suitable for high pressure and large flow, and the application range of working media is wide; leakage-free control can be realized; the system has the characteristics of high flow and low liquid resistance, has high efficiency, has the characteristics of quick opening and closing, and can control the switching characteristic; the flow control characteristics are good. High anti-pollution power, reliable performance and long service life.

In the embodiment, the number of the hydraulic locking control parts is 1, the number of the small fluctuation combined control valve groups is 2, and one hydraulic control valve body is arranged on each of two side surfaces; the large-fluctuation logic cartridge valve group is provided with 4 hydraulic control valve main bodies, one hydraulic control valve main body is arranged on each side face, and 2 hydraulic control valve main bodies are arranged on the top; the number of the oil supply interfaces is 1, the number of the oil return interfaces is 2, and the oil supply interfaces are all arranged on the same front surface of the hydraulic control valve main body, so that the adjustment requirements of the unit on adjusting fluctuation setting on-direction and off-direction are met. The oil pump motor set is provided with 1 main pump and 1 standby pump, and 1 pressure hydraulic control valve group is arranged between the main pump and the standby pump. The high-pressure oil press mechanism is also provided with an air filter, an oil filter, a pressure controller, a control valve group and a meter, and the structures are positioned on a pipeline at a required position in the pressure hydraulic control valve group and are conventionally arranged. The high-pressure bag type energy accumulator is formed by connecting 3 bag type energy storage tanks in parallel. Other parts for control such as an electric contact pressure gauge, a safety valve, a gas compensating valve, a check valve and the like are also arranged at corresponding positions in the high-pressure oil pressure mechanism.

Manual emergency operation ports are arranged on the integrated valve blocks in the digital hydraulic control valve block, and emergency operation can be performed when a control system fails. Each integrated block electromagnetic valve in the digital hydraulic control valve group, namely the size fluctuation hydraulic control valve group and the logic cartridge valve are respectively provided with a square plug with a lamp, and the specific structure is as shown in fig. 10, and the running state of the electromagnetic valve is visible in real time.

The automatic regulating part in the hydraulic operation adopts a large fluctuation and small fluctuation parallel regulating mode, the large fluctuation valve adopts a large fluctuation hydraulic control valve group as a pilot valve, and the logic cartridge valve is controlled to carry out large flow control. And a manual button is additionally arranged on the small fluctuation combined control valve group and is also used as a manual operation valve.

The emergency shutdown valve also arranged on the digital hydraulic control valve group is a two-position three-way electromagnetic reversing valve, and the hydraulic control valve group and the hydraulic control shuttle valve with large fluctuation are controlled simultaneously, as shown in figure 8. The emergency shutdown valve prevents the turbine from operating at a rapid rotational speed for a long period of time. When the unit normally operates, the emergency shutdown valve is only used as a pressure oil channel, so that the speed regulator is communicated with the pipeline of the servomotor. When the unit gets rid of load and encounters a fault of the speed regulating system, the emergency shutdown valve acts to cut off the connection between the main distributing valve and the servomotor, and the pressure oil is directly connected into the servomotor from the high-pressure oil pressure mechanism, so that the servomotor is quickly closed, the emergency stop surface of the unit is realized, the over-speed time of the unit is shortened, and the water turbine is protected.

The system principle in the utility model is shown in fig. 6 and 7, and the operation flow of the system principle is as follows:

the speed regulator valve block controls the oil quantity by controlling the water guide vane servomotor (or blade servomotor for short) so as to promote the opening degree of the water guide vane (blade) to control the water flow of the water turbine and regulate the rotating speed of the water turbine, namely the speed regulating function of the water turbine speed regulator.

When the emergency shutdown valve is filled with pressure oil (left position), the following five working conditions exist:

(1) Small fluctuation shutdown condition: when the servomotor is slightly regulated, the output signal controls the small fluctuation shutdown ball valve to act, so that the small fluctuation shutdown ball valve is positioned at the left position, pressure oil flows to the servomotor from the small fluctuation shutdown ball valve, and the servomotor acts after the throttle valve is regulated;

(2) Small fluctuation starting-up working condition: when the servomotor is slightly regulated, the output signal controls the small-fluctuation starting ball to enable the valve servomotor to act;

(3) Large fluctuation shutdown condition: when the servomotor needs to act for a large stroke, the output signal controls the large-fluctuation shutdown ball valve, controls the control oil of the cartridge valve, and realizes the shutdown action of the servomotor;

(4) Large fluctuation starting-up working condition: when the servomotor needs to act for a larger stroke, the output signal controls the large-fluctuation starting ball valve to act and the servomotor to start;

(5) Stabilizing the balance working condition: under the condition that the electromagnet is in a power failure, the servomotor is in a stable balance state, and each electromagnetic valve is in a self-locking state (oil way is closed), namely, when an electric part fails, the servomotor maintains the original opening degree unchanged. At this time, manual operation can be performed by a manual button.

When the emergency shutdown valve is in the right position through automatic or manual signal action under the condition of accident shutdown, the control oil source of the large fluctuation shutdown ball valve is discharged from the oil return tank, the action working condition of the system is the same as that of the large fluctuation shutdown, no matter the control signal of the emergency shutdown valve is disconnected, the guide vane servomotor is continuously closed back, and the servomotor stops action only when a reset signal is given.

When the mechanical hydraulic lock is in place: when the electromagnet on the hydraulic locking electromagnetic valve obtains a control signal, locking input; when the electromagnet below the hydraulic locking electromagnetic valve obtains a control signal, locking and pulling out; when the device is started again, a signal for locking and pulling out is given.

In the hydraulic control mechanism of the hydraulic turbine speed regulator, which consists of a large-fluctuation logic cartridge valve and a small-fluctuation digital ball valve, the working characteristics and the connecting structure of a main valve unit are as shown in fig. 9: A. two working chambers B) and the control chamber K, the valve core is controlled to be opened (resultant force is less than 0), closed (resultant force is more than 0) and no position is left (resultant force=0), and the on-off control of the large fluctuation logic valve is realized through the pressure change of the control chambers. Different pilot valves are used to form pressure control, direction control or flow control, and may form a compound control. A plurality of two-way cartridge valves with different control functions are assembled in one or a plurality of cartridge blocks to form a hydraulic circuit.

Selection principle of pilot control oil: in order to ensure the stability and reliability of the speed regulator, the opening and closing actions of the large fluctuation logic valve are required to be highly reliable and rapid, so that the control oil pressure is stable and reliable, and the pressure fluctuation is small.

Compared with a four-way slide valve, the utility model adopts micro-structure pilot valve control to control the pilot control valve by using the large-fluctuation hydraulic control valve group and the main stage of the two-way logic cartridge valve seat, and can accept the control of various types of switches, analog quantity and digital signals without limitation. And the feedback and comparison of mechanical and hydraulic parameters are carried out, the pressure, flow and direction required by the actuating mechanism are precisely controlled, and the hydraulic control valve is compatible with a switch valve, a servo valve, a proportional valve and a digital valve. If the pilot signal is continuously or proportionally regulated, the valve seat main stage of the plug-in element can realize the servo/proportional control function and has excellent controllability and flexibility. The valve seat structure overcomes the defects of new poor technology, radial clearance leakage and the like of the slide valve. The main stage of the logic cartridge valve seat is wire sealing, zero covering, short axial dimension and small valve core quality, so that the dynamic quality of a control system is improved, and the multifunctional, flexible and changeable integrated combination is realized. The main stage of the cartridge valve seat is wire seal, zero cover, short axial dimension and small valve core mass. The dynamic quality of the control system is improved, and the multifunctional, flexible and changeable integrated combination is realized.

The on-off valve of the small fluctuation on-off valve and the large fluctuation control valve adopts a quick on-off valve, the quick on-off digital valve acts for 3ms to 35ms, see figure 11, and the model is 3SEW6/10-UK/CK. The quick switch valve is used as a pilot valve for adjustment, has strong pollution resistance, good repeatability and high stability, and can be directly connected with a computer.

According to the technical requirements of GB/T9652-2019 speed governor: the unit automatically operates under no-load working condition, and when the effective frequency difference of the frequency step change is not less than 4% of the fixed frequency fr of , the dynamic regulation performance of the no-load disturbance response process of the regulating system is: the adjustment time Tfr from the start of the step disturbance until the adjustment stabilizes does not exceed 35s. The regulating system adopting the power regulating mode is characterized in that the unit stably operates under the wabby load working condition, and the dynamic regulating performance of the power response process is realized by taking the power regulating instruction received by the speed regulator as a starting point: the adjustment time ts satisfies: the target value variation of the active power is not less than the unit When 25% of the active power Pr is determined, ts is not more than 45s, and the target value variation of the active power is set to determine the active power Pr

When ts is->

When the target value variation of the active power is smaller than 5% of the fixed active power Pr of the unit and is larger than the artificial power dead zone EP, ts is preferably not larger than an electrohydraulic servo valve for a 30S hydraulic turbine governor, and the response frequency is generally 5-10 Hz.

The speed regulator measures the rotating speed signal of the hydroelectric generating set through the frequency measuring element, synthesizes the signals sent by the frequency measuring element and the signal feedback element, amplifies the synthesized signals and then transmits the amplified signals to the actuating element of the speed regulator, namely the hydraulic system, so as to regulate and control the movement of the water guide mechanism of the turbine surface, thereby completing the regulation and control of the rotating speed and the output power of the water turbine. The microcomputer controller is a control core component of the speed regulator and is mainly responsible for signal acquisition of water level, frequency, active power, guide vane opening and the like, data operation, operation condition and operation mode switching, analog quantity input and output, discrete quantity input and output, control value output, actuator control, networked digital communication and other additional functions. The servomotor and the high-precision displacement sensor are arranged on other units of the power plant.

The dead zone in the utility model is 0.0027 percent resolution is 0.0005Hz and the nonlinearity is 0.128 percent.

The PLC is a programmable controller and has the functions of measuring active power, measuring water head, touch screen and operation. The PLC outputs a pulse sequence through PID operation, and the pulse sequence is amplified and is used as an input signal of the switch valve, but the switch valve is only in an open state and a close state, the output flow is intermittent, at the moment, the PWM control technology is required to control the high-speed switch valve to output continuous flow signals and enter the servomotor, so that the displacement of the servomotor is controlled, the feedback signals are obtained from the displacement of the servomotor, are converted into frequency signals through V/F and are input into the PLC again, and the frequency signals are comprehensively compared with the operation value, so that the aim of adjusting the opening of the guide vane is achieved. Due to the water flow penetration time constant, the water head change, the tail water fluctuation and the pulsation caused by the uneven flow field in the volute, the microcomputer speed regulator of the water turbine has the condition that the opening degree of the guide vane is not adjusted in place, namely the dead zone for controlling the opening degree of the guide vane. If the dead zone is too large, the substance is failure of theory and automatic control, and the method is particularly characterized in that the frequency swing of a unit is too large, the main and auxiliary pumping is severe, the oil is frequently pumped, the pipeline is vibrated, the grid connection is difficult, and the like. Of course, the smaller the dead zone is, the better, the more accurate the dead zone, the more sensitive the main pressure valve, if there is a dead zone in the system, the dead zone will "scatter" in the whole adjusting process during dynamic adjusting process, so that the vane feedback curve and the given curve are not completely consistent, and a relatively gentle adjusting transition process is formed, which is beneficial to effectively suppressing the frequency feedback lag caused by the inertia of the machine set.

The ASIC (application specific integrated circuit) used in the utility model, the controller uses Automation Studio 4.0.0 software development platform, GV-S-D-1.0, adjusts rapidly and accurately, combines the control logic of the traditional servo valve structure, converts into the control of a digital logic valve, ensures that the speed regulator can rapidly act to a set position under any working condition, simultaneously can cut off pressure oil for simultaneously closing two cavities of a servomotor switch under a steady state condition, and improves dwell time while solving the problem that the position is disturbed and drifted.

Test one

The test method comprises the following steps:

(1) Setting the signal of a frequency signal generator to be 50Hz, connecting the frequency signal into a unit frequency measurement input terminal, adjusting power setting to enable the servomotor to be opened to 50%, gradually increasing the frequency of a signal source to enable the opening degree of the servomotor to be close to full closing, reducing a frequency signal to enable the servomotor to start moving to a point towards the opening;

(2) And sequentially and unidirectionally increasing a 0.25Hz signal frequency source, and recording the frequency f and the servomotor stroke y after the servomotor is stable. Until the servomotor is fully opened (directly collected by a computer);

(3) And then sequentially decreasing the frequency signal by 0.25 in a unidirectional way, and recording the frequency f and the servomotor stroke y after the servomotor is stable. Until the servomotor is fully closed (directly collected by a computer);

(4) Repeat 2 times bp=4% (6%);

(5) And (3) solving (directly acquiring by calculation software) a speed dead zone of the speed regulator according to the test record, and obtaining the linear error of the servomotor.

The static characteristics of the speed regulator in the utility model: static characteristic linearity: the linear error is not more than 3 percent when the linear error is approximately a straight line;

the dead zone of the rotating speed of the static characteristic curve is less than or equal to 0.02 percent (measured to the main servomotor).

The dynamic characteristics of the speed regulator in the utility model: when the hydro-generator set can meet the standard steady operation under various automatic working conditions, the dynamic characteristics of the speed regulator can reach the state.

(1) Dynamic characteristics:

under the condition that the open-loop gain of the electrohydraulic adjusting device is not less than 60 percent of the limit open-loop gain, step frequency signals are input, and the dynamic characteristics under various adjusting parameter combinations have good PID rules without twitching and other abnormal phenomena:

the device can stably operate under various working conditions; the relative swing value of the rotating speed of the unit is not more than +/-0.15% after the automatic idle running for 3 min; the motionless time of the servomotor is not more than 0.2s;

dynamic quality at 100% load shedding: the fluctuation times of the hyperstable rotating speed above 3% of the rated rotating speed are not more than 1.5 times;

the adjustment time does not exceed 4Tm (Tm is the time from the start of load shedding to the rise of the rotational speed of the unit to the maximum value).

Primary frequency modulation and isolated network performance meet DL/T1245-2013 specification requirements.

(2) Drift effect: the drift (nr) of the electrical device is less than 0.01 percent, and the comprehensive drift (nr) is less than 0.3 percent.

(3) Reliability: average fault interval time not less than 25000h; average overhaul interval time is more than 4 years; the availability of the automatic mode is 99.9%, and the availability of the automatic and manual modes is 100%.

Test II

In the test method I, the opening degree increasing and decreasing time is provided when the difference is adjusted: when the power increasing or decreasing button is continuously pressed, the time for changing the opening of the unit guide vane servomotor by 100% is adjustable within 2.5-120S, and the given step length of the pressing button is adjusted from 0.01% -5%.

Various switches: the stroke change of the guide vane servomotor caused by the mutual switching between the alternating current power supply and the direct current power supply is not more than 0.01% of the full stroke; when the speed regulator is switched between the automatic operation mode and the manual operation mode, the stroke change of the guide vane servomotor is not more than 1% of the full stroke.

According to the utility model, the communication interface Modbus RTU (RS 485) or Modbus TCP (RJ 45) of the speed regulator is adjustable, the full-open time of the guide vane is 6-20 seconds, and the full-close time of the guide vane is 6-20 seconds. Electromagnetic compatibility meets the relevant requirements of the electromagnetic compatibility in IEC61000-4-1, IEC61000-3-2, IEC61000-3, CISPR11 and GB standards. In the using process, the alternating current power supply is AC220V15%50Hz or 60Hz, and the direct current power supply is DC220V15%. The structure of the local components is conventionally set.

The speed regulator has good dynamic quality, and all performance indexes reach or are superior to national standards; the self-adaptive starting-up rule can rapidly (operating power 75000 N.m) and safely start up the unit to no-load for different units; the frequency of the power grid is automatically tracked in an idle load way, so that the frequency of a unit can reach the synchronous requirement rapidly (less than 30S); the intelligent variable structure PID regulation rule ensures that the unit always works in the optimal state; active power closed-loop adjustment can be automatically performed according to instructions of a monitoring system in a channeling communication mode (RS 422 and RS485 can be converted and used); the operation conditions are switched randomly without disturbance by adopting a sectional pulse width (processed by a size fluctuation hydraulic control valve).

The modulation mode adopts a pulse width modulation mode, and the speed regulator valve block is applied to a microcomputer, a pulse width modulation digital valve, a pulse width modulation amplifier, an execution device (servomotor) and an energy device (high-pressure oil pressure mechanism) in the operation of an open loop and a closed loop, and has the advantages of quick response, higher precision and good stability.

The PLC controller can feed back the opening degree of the servomotor and the state of the intelligent hydraulic servo system to the regulator in real time, and the opening degree of the servomotor can also be fed back to the unit LCU in real time for logic sequential control and monitoring recording such as surface opening and shutdown, and the state of the intelligent hydraulic servo system comprises an oil filter blocking signal, a servo driver fault, an oil-free electric conversion feedback fault, a servomotor feedback fault and the like.

The utility model automatically adjusts the rotating speed of the water turbine generator set, so that the water turbine generator set can keep normal operation within the allowable deviation of the rated rotating speed, thereby meeting the standard requirement of the power grid on frequency and quality; the quick start-up device has a quick start-up effect, and is suitable for increasing and decreasing the load of a power grid and the need of normal shutdown or emergency shutdown. The parts are easy to assemble and disassemble, the process is easy to master, special tools and special trained maintenance personnel are not needed, and the characteristics of simplicity, reliability and convenience in use of the system are ensured. Thereby achieving the specific requirements on reliability, sensitivity, stability and the like in the running process of the hydropower plant unit.

The above examples/experiments are only examples for clarity of illustration and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (8)

1. A speed governor control valve block for a hydraulic turbine, characterized by: the hydraulic oil pressure system is provided with an electric regulating mechanism, a hydraulic follow-up mechanism and a high-pressure oil pressure mechanism, wherein the high-pressure oil pressure mechanism comprises an oil pump motor group and an integrated oil path block, the integrated oil path block is provided with an oil return tank and an energy storage gas group, and the oil pump motor group and the energy storage gas group are respectively arranged on two side surfaces of the oil return tank; the bottom end of the oil pump motor unit is provided with a pressure hydraulic control valve group; the pressure hydraulic control valve group, the oil pump motor group and the oil return box are connected into a whole through an oil pipeline, and the energy storage gas group is connected with the oil return box through the pressure oil pipeline; the electric regulating mechanism is a PLC controller; the hydraulic servo mechanism comprises a digital hydraulic control valve group;

The digital hydraulic control valve group is provided with a hydraulic control valve main body, the front surface of the hydraulic control valve main body is provided with an oil return interface and an oil supply interface, both sides of the hydraulic control valve main body are provided with a small fluctuation combined control valve group and a large fluctuation logic cartridge valve group, the top of the hydraulic control valve main body is provided with a large fluctuation hydraulic control valve group and a large fluctuation logic cartridge valve group, and one side of the hydraulic control valve main body is provided with a hydraulic locking control piece above the small fluctuation combined control valve group; the small fluctuation combined control valve group, the large fluctuation logic cartridge valve group, the large fluctuation hydraulic control valve group and the hydraulic locking control piece are connected with the hydraulic control valve main body by adopting integrated valve blocks.

2. A governor control valve block for a hydraulic turbine according to claim 1, wherein: the speed regulator control valve block is provided with an energy storage gas group, a PLC controller, a digital hydraulic control valve group, an oil return tank, an oil pump motor group and a pressure hydraulic control valve group, wherein the energy storage gas group and the oil pump motor group are arranged on the side surface of the oil return tank, the PLC control cabinet and the digital hydraulic control valve group are arranged on the upper surface of the oil return tank in parallel, the pressure hydraulic control valve group is arranged at the bottom end part of the oil pump motor group, and the pressure hydraulic control valve group, the oil pump motor group and the oil return tank are connected through an oil pipeline.

3. A governor control valve block for a hydraulic turbine according to claim 1, wherein: the bottom end of the digital hydraulic control valve group is provided with a support, and the digital hydraulic control valve group is connected with the oil tank into a whole through the support.

4. A governor control valve block for a hydraulic turbine according to claim 1, wherein: the high-pressure oil pressure mechanism is a high-pressure bag type energy accumulator, and the operating oil pressure in the high-pressure oil pressure mechanism is less than or equal to 25MPa.

5. A governor control valve block for a hydraulic turbine according to claim 4, wherein: the high-pressure oil pressure mechanism is used for supplying oil in a double-system oil supply mode of a main pump and a standby pump.

6. A governor control valve block for a hydraulic turbine according to claim 1, wherein: and each integrated valve block on the speed regulator control valve block is respectively provided with a manual emergency operation port, so that emergency operation is performed when a control system fails.

7. A governor control valve block for a hydraulic turbine according to claim 6, wherein: each integrated block electromagnetic valve on the speed regulator control valve block is respectively provided with a square plug with a lamp, and the running state of the electromagnetic valve is visible in real time.

8. A governor control valve block for a hydraulic turbine according to claim 1, wherein: the digital hydraulic control valve group is also provided with an emergency shutdown valve which is a two-position three-way electromagnetic reversing valve and is used for controlling the large-fluctuation hydraulic control valve group and the hydraulic control shuttle valve.

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