CN101598232B - Control Valve Electrohydraulic Actuator - Google Patents
Control Valve Electrohydraulic Actuator Download PDFInfo
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Abstract
Description
技术领域technical field
本发明涉及一种大流量流体压力控制的调节装置，属于控制阀技术领域。The invention relates to an adjusting device for large flow fluid pressure control, which belongs to the technical field of control valves.
背景技术Background technique
钢厂循环发电工程采用的燃气轮发电机组，要求输入的煤气压力稳定。由于技术、安全和成本的原因，煤气的稳压目前均采用气动压力调节阀实现。煤气压力波动大，会引起严重的喘振。为防止喘振，气动压力调节阀必须能够快速响应，快速打开或关闭。输入每台燃气轮机的焦炉和高炉混合煤气供给量较大，可达每小时数万立方米。在如此大流量下，通过普通的大型气动压力调节阀实现压力稳定、实现快速响应是十分困难的，主要原因是由于动态响应慢、滞后。压力不稳定是导致发电设备停机的重要原因和隐患。The gas turbine generator set used in the cycle power generation project of the steel plant requires the input gas pressure to be stable. Due to technical, safety and cost reasons, gas pressure regulation is currently achieved using pneumatic pressure regulating valves. Large gas pressure fluctuations can cause severe surges. To prevent surge, pneumatic pressure regulating valves must be able to respond quickly, opening or closing quickly. The coke oven and blast furnace mixed gas supplied to each gas turbine is relatively large, up to tens of thousands of cubic meters per hour. Under such a large flow rate, it is very difficult to achieve pressure stability and quick response through ordinary large pneumatic pressure regulating valves, mainly due to slow dynamic response and hysteresis. Pressure instability is an important cause and hidden danger of power generation equipment shutdown.
传统大型压力调节阀响应慢且响应滞后，不能适应循环发电工程中大流量煤气的压力稳定。调节阀响应时间主要取决于执行机构。常用的执行机构有气动和电动执行机构。气动执行机构采用压缩空气或氮气作动力源，抗偏离能力差，不适于快速响应和大的执行机构。电动执行机构由电机、减速齿轮箱、控制箱等组成，由于电机要经过减速，执行机构速度甚至比气动执行机构还要低。当实现大的推力时，电动执行机构体积庞大，而且其封闭的结构会产生热量，安全性降低。执行机构特性影响整个系统的动态特性和动态响应时间。压力调节阀响应滞后则主要取决于系统的滞环特性，即死区的影响，摩擦是影响死区的主要因素之一。普通的液压驱动系统通常是一备有一个较大的油箱的复杂装置，电机与油泵需持续运转，不利于节约能源。Traditional large-scale pressure regulating valves respond slowly and lag behind, and cannot adapt to the pressure stability of large-flow gas in cycle power generation projects. The response time of the control valve depends mainly on the actuator. Commonly used actuators are pneumatic and electric actuators. Pneumatic actuators use compressed air or nitrogen as the power source, which has poor anti-deviation ability and is not suitable for fast response and large actuators. The electric actuator is composed of a motor, a reduction gear box, a control box, etc. Since the motor has to be decelerated, the speed of the actuator is even lower than that of the pneumatic actuator. When achieving a large thrust, the electric actuator is bulky, and its closed structure will generate heat, reducing safety. The characteristics of the actuator affect the dynamic characteristics and dynamic response time of the entire system. The response lag of the pressure regulating valve mainly depends on the hysteresis characteristics of the system, that is, the influence of the dead zone, and friction is one of the main factors affecting the dead zone. Ordinary hydraulic drive systems are usually a complex device with a large oil tank, and the motor and oil pump need to run continuously, which is not conducive to energy saving.
发明内容Contents of the invention
本发明针对现有大型压力调节阀存在的动态响应时间慢、响应滞后等问题，提供一种动态响应时间快、能够消除响应滞后的控制阀电液驱动器，使其适用于大流量流体的压力控制。The present invention aims at the problems of slow dynamic response time and response lag existing in existing large-scale pressure regulating valves, and provides an electro-hydraulic driver for control valves with fast dynamic response time and capable of eliminating response lag, making it suitable for pressure control of large-flow fluids .
本发明的控制阀电液驱动器包括液压驱动系统、压力传感器、流量传感器、位置传感器和控制单元：The control valve electro-hydraulic driver of the present invention includes a hydraulic drive system, a pressure sensor, a flow sensor, a position sensor and a control unit:
液压驱动系统：用于驱动控制阀的阀芯，包括双向作用驱动缸、方向控制阀、三位四通换向阀、蓄能器、伺服电机和双向齿轮泵，双向齿轮泵与伺服电机连接，伺服电机与控制单元连接，双向齿轮泵的进油口与出油口一方面分别通过单向阀与蓄能器连接，蓄能器再通过三位四通换向阀与双向作用驱动缸连接；另一方面双向齿轮泵的进油口与出油口直接通过方向控制阀与双向作用驱动缸连接，双向作用驱动缸安装在需要控制的控制阀上，双向作用驱动缸内的活塞与控制阀的阀芯连接；液压油从出油腔流出直接进入进油腔，中间不需要经过油箱。Hydraulic drive system: used to drive the spool of the control valve, including double-acting drive cylinder, directional control valve, three-position four-way reversing valve, accumulator, servo motor and two-way gear pump, the two-way gear pump is connected with the servo motor, The servo motor is connected to the control unit, and the oil inlet and outlet of the two-way gear pump are respectively connected to the accumulator through a one-way valve, and the accumulator is connected to the two-way acting drive cylinder through a three-position four-way reversing valve; On the other hand, the oil inlet and outlet of the bidirectional gear pump are directly connected to the double-acting drive cylinder through the directional control valve. The double-acting drive cylinder is installed on the control valve that needs to be controlled. The spool is connected; the hydraulic oil flows out of the oil outlet chamber directly into the oil inlet chamber without passing through the oil tank.
压力传感器和流量传感器：安装在流体输出的管道上，用于检测管路中输出流体的压力和流量，均与控制单元连接；Pressure sensor and flow sensor: installed on the fluid output pipeline, used to detect the pressure and flow of the output fluid in the pipeline, both connected to the control unit;
位置传感器：安装在双向作用驱动缸上方，用于检测所要控制的控制阀的阀芯位置，与控制单元连接。Position sensor: installed above the double-acting drive cylinder, used to detect the spool position of the control valve to be controlled, and connected with the control unit.
所述方向控制阀包括阀体、活塞和锥销，活塞安装在阀体的内孔中，阀体上在活塞的两侧各设有一组进出油口，每组进出油口之间均设有控制油口相通的锥销，锥销与阀体内壁之间设有弹簧。The directional control valve includes a valve body, a piston and a taper pin, the piston is installed in the inner hole of the valve body, and a group of oil inlet and outlet ports are respectively arranged on both sides of the piston on the valve body, and each group of oil inlet and outlet ports is provided with The taper pin connected to the oil port is controlled, and a spring is arranged between the taper pin and the inner wall of the valve.
上述控制阀电液驱动器通过控制单元(采用PLC)设定管路运行的压力和流量等。当控制阀输出压力、流量增大时，压力流量传感器将压力、流量的变化信号输出，反馈到控制单元，控制伺服电机启动双向齿轮泵，推动双向作用驱动缸的活塞移动，调小控制阀的开口度。当控制阀输出压力、流量减小时，压力流量传感器将压力、流量的变化信号输出，反馈到控制单元，控制伺服电机启动双向齿轮泵，推动双向作用驱动缸的活塞移动，调大控制阀的开口度。通过位置传感器检测所要控制的控制阀的阀芯位置。The electro-hydraulic driver of the above-mentioned control valve sets the pressure and flow of the pipeline operation through the control unit (using PLC). When the output pressure and flow of the control valve increase, the pressure flow sensor outputs the change signal of pressure and flow, and feeds back to the control unit, controls the servo motor to start the bidirectional gear pump, pushes the piston of the bidirectional acting drive cylinder to move, and adjusts the pressure of the control valve. Openness. When the output pressure and flow rate of the control valve decrease, the pressure flow sensor outputs the change signal of pressure and flow rate and feeds it back to the control unit, controls the servo motor to start the bidirectional gear pump, pushes the piston of the bidirectional acting drive cylinder to move, and increases the opening of the control valve Spend. The spool position of the control valve to be controlled is detected by a position sensor.
本发明通过电液驱动，相对传统的气动执行机构和电动执行机构，具有行程大、推力或力矩大、响应时间快、灵敏度高、机构紧凑等特点。由控制单元自动控制液压系统，这样可以发挥电动控制响应速度快、液压输出力大的优点，也可实现控制阀的快速响应，提高控制阀的可靠性。该控制阀电液驱动器可以实现液压油从出油腔流出直接进入进油腔，中间不需要经过油箱，只需较小的油箱。整个控制阀电液驱动器元件少，结构简单紧凑，成本低。液压驱动系统的电机与油泵不需持续运转，间歇工作，在节能的同时，还可以延长系统的寿命，实现超长时间稳定运行，具有高的可靠性。本发明特别适用于钢厂循环发电工程中煤气压力的调节控制，也能够适合用于火力发电、核电、化工等流体的调节。The invention is driven by electro-hydraulic, and compared with traditional pneumatic actuators and electric actuators, it has the characteristics of large stroke, large thrust or torque, fast response time, high sensitivity, and compact mechanism. The hydraulic system is automatically controlled by the control unit, which can give full play to the advantages of fast response speed of electric control and large hydraulic output force, and can also realize fast response of the control valve and improve the reliability of the control valve. The electro-hydraulic driver of the control valve can realize that the hydraulic oil flows out from the oil outlet chamber and directly enters the oil inlet chamber, without passing through the oil tank in the middle, and only needs a smaller oil tank. The whole control valve electro-hydraulic driver has few components, simple and compact structure, and low cost. The motor and oil pump of the hydraulic drive system do not need to run continuously, but work intermittently. While saving energy, it can also prolong the life of the system, achieve ultra-long-term stable operation, and have high reliability. The invention is especially suitable for the adjustment and control of the gas pressure in the cycle power generation project of the steel mill, and can also be suitable for the adjustment of fluids in thermal power generation, nuclear power, chemical industry and the like.
附图说明Description of drawings
图1是本发明的结构原理示意图。Fig. 1 is a schematic diagram of the structure principle of the present invention.
图2是本发明的控制原理示意图。Fig. 2 is a schematic diagram of the control principle of the present invention.
图3是本发明中方向控制阀的结构示意图。Fig. 3 is a structural schematic diagram of the directional control valve in the present invention.
其中：1、双向作用驱动缸，2、方向控制阀，3、三位四通换向阀，4、蓄能器，5、油箱，6、伺服电机，7、双向齿轮泵，9、单向阀，10、单向阀，11、上活塞杆，12、油口，13、下活塞杆，14、活塞，15、油口，16、支架，17、阀体，18、阀芯，19、弹簧，20、套，21、活塞，22、锥销，23、弹簧，24、方向控制阀体，25、锥销。Among them: 1. Two-way acting drive cylinder, 2. Directional control valve, 3. Three-position four-way reversing valve, 4. Accumulator, 5. Fuel tank, 6. Servo motor, 7. Two-way gear pump, 9. One-way Valve, 10, one-way valve, 11, upper piston rod, 12, oil port, 13, lower piston rod, 14, piston, 15, oil port, 16, bracket, 17, valve body, 18, spool, 19, Spring, 20, cover, 21, piston, 22, taper pin, 23, spring, 24, direction control valve body, 25, taper pin.
具体实施方式Detailed ways
本发明的控制阀电液驱动器包括液压驱动系统、压力传感器、流量传感器、位置传感器和控制单元，液压驱动部分、压力传感器、流量传感器和位置传感器均与控制单元连接(参见图2)。The control valve electro-hydraulic actuator of the present invention includes a hydraulic drive system, a pressure sensor, a flow sensor, a position sensor and a control unit, and the hydraulic drive part, the pressure sensor, the flow sensor and the position sensor are all connected to the control unit (see Figure 2).
如图1所示，液压驱动系统主要包括双向作用驱动缸1、方向控制阀2、三位四通换向阀3、蓄能器4、伺服电机6和双向齿轮泵7，双向齿轮泵7与伺服电机6连接，由伺服电机6控制运转，伺服电机6与控制单元(PLC)连接。双向齿轮泵7的进油口与出油口一方面分别通过单向阀9和单向阀10与蓄能器4连接，蓄能器4再通过三位四通换向阀3与双向作用驱动缸1连接；另一方面双向齿轮泵7的进油口与出油口直接通过方向控制阀2与双向作用驱动缸1连接。双向作用驱动缸1通过支架16固定安装在需要控制的控制阀的阀体17上，双向作用驱动缸1内的活塞14通过下活塞杆13与控制阀的阀芯18连接。蓄能器4可固定安装在双向作用驱动缸1的壳体上。As shown in Figure 1, the hydraulic drive system mainly includes a double-acting
伺服电机6带动双向齿轮泵7转动，通过油箱5吸油，当双向齿轮泵7自左向右供油时，液压油一方面通过单向阀9向蓄能器4供油，一方面通过方向控制阀2的油口A进入，从油口B输出，经油管由油口12进入双向作用驱动缸1的上部腔体，推动双向作用驱动缸1的活塞14下行，连接在活塞14下端的下活塞杆13推动控制阀的阀芯18下行，减小阀门开口度。当双向齿轮泵7自右向左供油时，液压油一方面通过单向阀10向蓄能器4供油，一方面通过方向控制阀2的油口C进入，从油口D输出，经油管由油口15进入双向作用驱动缸1的下部腔体，推动双向作用驱动缸1的活塞14上行，下活塞杆13带动控制阀的阀芯18上行，增大阀门开口度。在双向作用驱动缸1的上方设有位置传感器，双向作用驱动缸1的活塞14上端连接有上活塞杆11，当活塞14上下移动时，该位置传感器检测上活塞杆11的移动距离，并将检测结果反馈给控制单元，该距离反应了控制阀的开口度，控制单元根据反馈信号决定伺服电机6的运转情况。The servo motor 6 drives the two-way gear pump 7 to rotate, and absorbs oil through the
也可由蓄能器4向双向作用驱动缸1供油，三位四通换向阀3处于中位时，蓄能器4为储能状态。当三位四通换向阀3处于右位时，蓄能器4向双向作用驱动缸1的上部腔体供油，推动驱动缸活塞14快速下行，当三位四通换向阀3处于左位时，蓄能器4向双向作用驱动缸1的下部腔体供油，推动驱动缸活塞快速上行。Oil can also be supplied from the
方向控制阀2的结构如图3所示。包括阀体24、活塞21，活塞21安装在阀体24的内孔中，阀体24上在活塞21的两侧各设有一组进出油口，即油口A与油口B以及油口C与油口D，每组进出油口之间均设有控制相通的锥销，即锥销22和锥销25，锥销25安装在套20内，套20内设有弹簧19，锥销22也安装在一个套内，该套内设有弹簧23。当油口A进油时，推动锥销22压缩弹簧23右移，油口A与油口B相通；同时推动活塞21向左移动，推动锥销25压缩弹簧19左移，油口C与油口D相通。当油口C进油时，推动锥销25压缩弹簧19左移，油口C与油口D相通；同时推动活塞21向右移动，推动锥销22压缩弹簧23右移，油口A与油口B相通。The structure of the directional control valve 2 is shown in FIG. 3 . Including the valve body 24 and the piston 21, the piston 21 is installed in the inner hole of the valve body 24, and the valve body 24 is provided with a set of oil inlet and outlet ports on both sides of the piston 21, that is, the oil port A, the oil port B and the oil port C With oil port D, there are taper pins for control communication between each group of inlet and outlet ports, that is, taper pin 22 and taper pin 25. Taper pin 25 is installed in sleeve 20. Spring 19 and taper pin 22 Also installed in a sleeve, the sleeve is provided with a spring 23 . When the oil enters the oil port A, push the cone pin 22 to compress the spring 23 to move to the right, and the oil port A communicates with the oil port B; at the same time, push the piston 21 to move to the left, push the cone pin 25 to compress the spring 19 to move to the left, and the oil port C is connected to the oil port Port D communicates. When the oil enters the oil port C, push the cone pin 25 to compress the spring 19 to move to the left, and the oil port C communicates with the oil port D; at the same time, push the piston 21 to move to the right, push the cone pin 22 to compress the spring 23 to move to the right, and the oil port A is connected to the oil port Port B is connected.
图2给出了本发明的控制原理，控制单元采用可编程控制器(PLC)。压力传感器和流量传感器安装在管路上，用于检测管路中输出流体的压力和流量。通过控制单元(PLC)设定管路运行的压力和流量等，压力传感器和流量传感器将采集到的信号反馈到控制单元(PLC)，与设定值比对，根据比对情况控制单元(PLC)控制液压驱动系统对控制阀的阀芯开度调节，以稳定控制阀的流量和压力。当控制阀输出压力、流量增大时，压力流量传感器将压力、流量的变化信号输出，反馈到控制单元，控制伺服电机6启动双向齿轮泵7，推动双向作用驱动缸1的活塞14移动，调小控制阀的开口度。当控制阀输出压力、流量减小时，压力流量传感器将压力、流量的变化信号输出，反馈到控制单元，控制伺服电机6启动双向齿轮泵7，推动双向作用驱动缸1的活塞14移动，调大控制阀的开口度。在双向作用驱动缸1的上活塞杆11的上方安装有与控制单元连接的位置传感器，通过位置传感器检测所要控制的控制阀的阀芯位置。在工作过程中，由于堵塞、磨损、变形等，控制阀的工作状态会发生变化，采用混合控制方法，充分利用智能控制算法和使用经验完成智能诊断。Fig. 2 has provided the control principle of the present invention, and the control unit adopts programmable logic controller (PLC). A pressure sensor and a flow sensor are installed on the pipeline to detect the pressure and flow of the output fluid in the pipeline. The pressure and flow of the pipeline operation are set by the control unit (PLC). The pressure sensor and flow sensor will feed back the collected signal to the control unit (PLC), compare it with the set value, and control the unit (PLC) according to the comparison. ) to control the hydraulic drive system to adjust the valve core opening of the control valve to stabilize the flow and pressure of the control valve. When the output pressure and flow of the control valve increase, the pressure flow sensor outputs the change signal of pressure and flow, and feeds it back to the control unit, controls the servo motor 6 to start the bidirectional gear pump 7, and pushes the piston 14 of the
本发明采用液压缸驱动控制阀阀芯技术，液压驱动系统间歇工作。当输入信号与控制阀开度平衡时，双向作用驱动缸1停止工作，不需电能来维持该平衡位置。The invention adopts the hydraulic cylinder driving control valve spool technology, and the hydraulic driving system works intermittently. When the input signal is balanced with the opening of the control valve, the double-acting
本发明通过液压驱动，并由控制单元自动控制液压系统，这样可以发挥电动控制响应速度快、液压输出力大的优点，也可实现控制阀的快速响应，提高控制阀的可靠性。液压驱动系统间歇工作，在节能的同时，还可以延长系统的寿命，实现超长时间稳定运行，具有高的可靠性。The invention is driven by hydraulic pressure, and the hydraulic system is automatically controlled by the control unit, so that the advantages of fast response speed of electric control and large hydraulic output force can be brought into play, fast response of the control valve can also be realized, and the reliability of the control valve can be improved. The hydraulic drive system works intermittently, which not only saves energy, but also prolongs the life of the system, realizes stable operation for a long time, and has high reliability.
本发明还可设置焦油堵塞智能自诊断系统，通过检测控制阀的压力、气量或振动信号，诊断控制阀系统是否存在焦油堵塞等故障，确定合理的停机检修时机。通过检测控制阀的压力、气量，分析调节阀的状态。根据大型压力控制阀的状态，实现零点和行程的自动调整，优化响应灵敏度，消除其影响。The present invention can also be equipped with an intelligent self-diagnosis system for tar clogging, which can diagnose whether there are faults such as tar clogging in the control valve system by detecting the pressure, gas volume or vibration signal of the control valve, and determine a reasonable shutdown time for maintenance. By detecting the pressure and air volume of the control valve, the state of the regulating valve is analyzed. According to the state of the large pressure control valve, the automatic adjustment of zero point and stroke is realized, the response sensitivity is optimized, and its influence is eliminated.
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