CN114199542A - Electric control valve opening degree calibration system and method - Google Patents
Electric control valve opening degree calibration system and method Download PDFInfo
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- CN114199542A CN114199542A CN202111519883.3A CN202111519883A CN114199542A CN 114199542 A CN114199542 A CN 114199542A CN 202111519883 A CN202111519883 A CN 202111519883A CN 114199542 A CN114199542 A CN 114199542A
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Abstract
本发明公开了一种电控阀开度标定系统及方法，其特征在于，包括：控制系统、压缩气源、流量计、流速检测计、压力传感器、流量管、电磁检测装置和传导杆；流量管连接在电控阀的两个端口并与压缩气源和流量计连接形成封闭回路，在电控阀的两个端口处分别各设置一个流速检测计和压力传感器，以检测电控阀两端口的流速和压力，传导杆可拆卸地连接在阀芯外端面的并将阀芯的运动传导至电磁检测装置，电磁检测装置内部磁场变化并输出电信号传输到控制系统表征阀芯运动量。该系统能够实现高效率的电控阀标定，能体现出在标定过程中阀芯的运动状态，在检测过程中建立位置和开度关系，提高了标定的精度和效率。
The invention discloses a system and method for calibrating the opening degree of an electronically controlled valve. The pipe is connected to the two ports of the electric control valve and is connected with the compressed gas source and the flowmeter to form a closed loop. A flow rate detector and a pressure sensor are respectively set at the two ports of the electric control valve to detect the two ports of the electric control valve. The transmission rod is detachably connected to the outer end face of the valve core and conducts the movement of the valve core to the electromagnetic detection device. The internal magnetic field of the electromagnetic detection device changes and the output electrical signal is transmitted to the control system to represent the movement of the valve core. The system can realize the high-efficiency calibration of the electric control valve, can reflect the movement state of the valve core during the calibration process, establish the relationship between the position and the opening degree during the detection process, and improve the accuracy and efficiency of the calibration.
Description
Technical Field
The invention belongs to the field of calibration detection, and particularly relates to an opening calibration system and method for an electric control valve.
Background
The electric control valve is a common control valve model and consists of two parts: an electric actuator and a control valve body. Manual operation is replaced by electric operation, so that the adjusting precision is higher, manpower is saved, and remote control can be realized. The electric regulating valve mainly depends on an electric actuator to drive the regulating valve to open and close. The electric actuator can receive current or voltage analog signals from the control system, and the purpose of adjusting the medium flow and pressure parameters of the pipeline is achieved by controlling different opening degrees of the adjusting valve, so that remote automatic control is realized.
In the prior art, the writing of the voltage signal related to the position is completed in the factory of the supplier, and the final actual position/voltage output tolerance exceeds the actual error precision range due to the accumulation of the manufacturing tolerance. And the precision calibration is realized again, a high-precision sensor is needed, the calibration cost is high, and the common manufacturer cannot bear the calibration cost.
In the calibration process, the motion state of the valve core cannot be monitored, only the calibration of the final state is performed, and the real-time monitoring in the calibration process is lacked.
The electric actuator controls the opening of the flow regulating valve and regulates the flow in the flow regulating valve. However, the relationship between the opening degree of the valve and the flow rate cannot be determined at present, and can only be judged by experience, and a reliable way for determining the relationship between the opening degree of the valve and the flow rate is not provided.
The above problems are urgently needed to be solved.
Disclosure of Invention
In order to solve the problems in the prior art mentioned in the background section, the invention provides an electronic control valve opening calibration system and method, which can realize the electronic control valve opening calibration and establish the relationship between the valve core displacement and the opening.
In order to achieve the purpose, the technical scheme of the invention is realized by the following modes:
an electronically controlled valve opening calibration system, comprising: the flow meter comprises a control system, a compressed air source, a flow meter, a flow velocity detector, a pressure sensor, a flow tube, an electromagnetic detection device and a conduction rod; the flow tube is connected with two ports of the electric control valve and connected with the compressed air source and the flowmeter to form a closed loop, the two ports of the electric control valve are respectively provided with the flow velocity detector and the pressure sensor to detect the flow velocity and the pressure of the two ports of the electric control valve, the conduction rod is detachably connected with the outer end face of the valve core and conducts the motion of the valve core to the inside of the electromagnetic detection device to cause the change of a magnetic field, and the magnetic field change in the electromagnetic detection device continuously outputs an electric signal to be transmitted to the control system to represent the motion of the valve core.
Furthermore, one end of the conduction rod is provided with a sucker which can be detachably fixed with the end face of the valve core, the other end of the conduction rod is arranged inside the electromagnetic detection device, a port of the conduction rod is provided with a first magnet, the first magnet keeps the same movement with the valve core through the conduction rod, and the electromagnetic detection device completes detection of the movement of the valve core through the movement of the first magnet.
Furthermore, the electromagnetic detection device also comprises a second magnet and a metal rod, wherein the second magnet is fixed on one side of the electromagnetic detection device and is arranged corresponding to the first electromagnet, a uniform variable magnetic field is formed between the first electromagnet and the second magnet, and the metal rod performs linear cutting magnetic induction motion at a constant speed in the variable magnetic field.
Furthermore, two ends of the metal rod are connected with a regulating circuit, and generate an electric signal and transmit the electric signal to a control system.
Furthermore, a laser sensor is arranged on the other side of the electric control valve, and the position precision after calibration is detected.
The invention also provides an opening calibration method of the electric control valve, which comprises the following steps:
s1, connecting two ends of an electric control valve into a flow tube, and setting the initial voltage and the initial opening position of a valve core;
s2, driving voltage is increased in a gradient mode, the voltage drives a valve core of the electric control valve to move, the motion of the valve core is conducted to the electromagnetic detection device through the conduction rod, and a current signal is output to the control system;
s3, converting the current signal into a moving signal by the control system to obtain a moving amount-driving voltage relation curve chart
S4, randomly selecting voltage in a displacement-voltage relation curve graph, driving the electric control valve, keeping the position of the valve core unchanged, detecting the position of the valve core by using the laser sensor 11, finishing displacement point detection if the displacement quantity accords with curve parameters, and covering original parameters by using detection parameters if the displacement quantity does not accord with the curve parameters;
s5, keeping the position of the valve core unchanged after the detection of S4, introducing fluid with constant flow into the inlet flow tube, and respectively arranging a flow rate detector and a pressure sensor on the inlet side and the outlet side of the electric control valve to detect the flow rate and the pressure of the fluid on the two sides of the electric control valve;
s6, transmitting flow velocity and pressure values at two sides of the electric control valve to a control system, and converting the flow velocity and pressure values into opening amount of the electric control valve by the control system;
s7, repeating S4-S6 to complete multi-point detection, establishing a data set of displacement-opening data of a plurality of detection points, training the data set by using a machine learning detection model, and finally fitting to obtain a displacement-opening relation curve graph.
Further, step S2 specifically includes: the end face of the valve core is fixedly connected with one end of the conduction rod, and the motion of the valve core is conducted into the electromagnetic detection device through the conduction rod and keeps the conducted motion state unchanged.
Furthermore, when the conducting rod conducts the movement of the valve core, the magnetic field inside the electromagnetic detection device changes along with the movement of the conducting rod, and the output current signal also changes.
Further, step S4 specifically includes: the flow meter controls the flow introduced into the electric control valve, the flow velocity detecting meters are respectively arranged at the inlet end and the outlet end of the electric control valve to detect the flow velocity, and the pressure sensors are respectively arranged at the inlet end and the outlet end of the electric control valve to detect the pressure.
Compared with the prior art, the method and the system for calibrating the opening of the electric control valve have the following advantages:
1. according to the invention, the relation between the current and the valve core motion is established through the electromagnetic detection device, the displacement of the valve core is represented through the current change, a driving voltage and displacement relation curve graph can be directly established, point-by-point calibration is not needed, and the calibration efficiency is improved.
2. In the process of detecting the voltage and displacement curves, the invention obtains the instantaneous flow of the detection point by a flow detection method, thereby establishing a relation curve of the voltage, the movement and the opening and ensuring that the calibration result is more accurate.
3. By introducing machine learning, the invention solves the problem of insufficient number of detection points after calibration, simulates and trains more data points, and ensures that the fitted opening-displacement curve is more accurate.
Drawings
FIG. 1 is a schematic structural diagram of an electronic control valve opening calibration system of the present invention;
FIG. 2 is a schematic structural diagram of an electromagnetic detection device;
FIG. 3 is a schematic structural diagram of an electromagnetic detecting device with another view angle;
FIG. 4 is a flowchart of an opening calibration method of an electric control valve according to the present invention;
referring to the drawings, wherein:
1. compressing a gas source; 2. a flow meter; 3. a flow rate detector; 4. an electrically controlled valve; 5. assembling; 6. a pressure sensor; 7. a conductive rod; 8. an electromagnetic detection device; 9. a flow tube; 10. a control system; 11. a laser sensor; 4-1, valve core; 8-1, a first magnet; 8-2, metal rods; 8-3, a second magnet; 8-4, variable magnetic field.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" include plural referents unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
Example 1:
as shown in fig. 1 to 3, an electronically controlled valve opening calibration system includes: the device comprises a control system 10, a compressed air source 1, a flowmeter 2, a flow velocity detector 3, a pressure sensor 6, a flow tube 9, an electromagnetic detection device 8 and a conduction rod 7; the flow tube 9 is connected with two ports of the electric control valve 4 and connected with the compressed air source 1 and the flowmeter 2 to form a closed loop, the two ports of the electric control valve 4 are respectively provided with a flow rate detector 3 and a pressure sensor 6 to detect the flow rate and the pressure of two ports of the electric control valve 4, the conduction rod 7 is detachably connected with the outer end surface of the valve core 4-1 and conducts the movement of the valve core 4-1 to the inside of the electromagnetic detection device 8 to cause the change of a magnetic field, and the change of the magnetic field in the electromagnetic detection device 8 continuously outputs an electric signal to the control system 10 to represent the movement of the valve core 4-1.
More specifically, one end of the conduction rod 7 is provided with a sucker which can be detachably fixed with the end face of the valve core 4-1, the other end of the conduction rod 7 is arranged in the electromagnetic detection device 8, a first magnet 8-1 is arranged at the port of the conduction rod 7, the first magnet 8-1 keeps the same movement with the valve core 4-1 through the conduction rod 7, and the electromagnetic detection device 8 detects the movement of the valve core 4-1 through the movement of the first magnet 8-1.
More specifically, electromagnetic inspectionThe measuring device 8 further comprises a second magnet 8-3 and a metal rod 8-2, the second magnet 8-3 is fixed on one side of the electromagnetic detection device 8 and is placed corresponding to the first electromagnet 8-1, a uniform variable magnetic field 8-4 is formed between the first electromagnet 8-1 and the second magnet 8-3, the metal rod 8-2 does cutting magnetic induction line motion in the variable magnetic field 8-4 at a constant speed, the metal rod generates variable electromotive force in the variable magnetic field 8-4 motion, a current signal is output through a connecting circuit, and the current magnitude and the displacement amount establish a relation through a formula:
wherein I represents the magnitude of current, μ is the dielectric constant in vacuum, M is the magnetic dipole moment, X represents the amount of movement, L is the distance between the two magnets at the beginning, H represents the length of the metal rod, and v represents the speed of movement of the metal rod.
More specifically, the two ends of the metal rod 8-2 are connected with a regulating circuit, and an electric signal is generated and transmitted to the control system 10.
More specifically, a laser sensor (11) is arranged on the other side of the electric control valve (4) and used for detecting the precision of the calibrated position.
Example 2:
as shown in fig. 4, an opening calibration method for an electrically controlled valve includes the following steps:
s1, connecting two ends of an electric control valve 4 into a flow tube 9, and setting the initial voltage and the initial opening position of a valve core 4-1;
s2, driving voltage is increased in a gradient mode, the voltage drives a valve core 4-1 of the electric control valve 4 to move, the motion of the valve core 4-1 is conducted to an electromagnetic detection device 8 through a conducting rod 7, and a current signal is output to a control system 10;
s3, converting the current signal into a moving signal by the control system 10 to obtain a moving amount-driving voltage relation curve chart;
s4, randomly selecting voltage in a displacement-voltage relation curve graph, driving the electric control valve 4, keeping the position of the valve core 4-1 unchanged, detecting the position of the valve core 4-1 by using an infrared distance measuring sensor, finishing displacement point detection if the displacement accords with curve parameters, and covering original parameters by using detection parameters if the displacement does not accord with the curve parameters;
s5, keeping the position of the valve core 4-1 unchanged after the detection of S4, introducing a constant-flow fluid into the inlet flow tube 9, and respectively arranging a flow rate detector 3 and a pressure sensor 6 on the inlet side and the outlet side of the electric control valve 4 to detect the flow rate and the pressure of the fluid on the two sides of the electric control valve 4;
s6, transmitting the flow velocity and pressure values at two sides of the electric control valve 4 to a control system 10, and converting the control system 10 into the opening amount of the electric control valve 4;
s7, repeating S4-S6 to complete multi-point detection, establishing a data set of displacement-opening data of a plurality of detection points, training the data set by using a machine learning detection model, and finally fitting to obtain a displacement-opening relation curve graph.
More specifically, step S2 specifically includes: the end surface of the valve core 4-1 is fixedly connected with one end of the conduction rod 7, and the movement of the valve core 4-1 is conducted into the electromagnetic detection device 8 through the conduction rod 7 and keeps the conduction movement state unchanged.
More specifically, when the conductive rod 7 conducts the movement of the valve element 4-1, the magnetic field inside the electromagnetic detection device 8 changes along with the movement of the conductive rod 7, and the output current signal also changes.
More specifically, step S4 specifically includes: the flowmeter 2 controls the flow that lets in the automatically controlled valve 4, and velocity of flow detects meter 3 and sets up respectively at the entry end and the exit end detection velocity of flow of automatically controlled valve 4, and pressure sensor 6 sets up respectively at the entry end and the exit end detection pressure of automatically controlled valve 4, through the formula:
the instantaneous section opening of the electric control valve 4 can be obtained, wherein A represents the section size, Q represents the flow rate size, and CqAnd delta P is a flow coefficient, the pressure difference value of two sides of the electric control valve is delta P, and rho is the density of the fluid.
In conclusion, the invention is different from the conventional calibration method, the motion state of the valve core is monitored in real time through the representation of the current signal, and a relation curve is directly established between the motion state and the driving voltage, so that the calibration efficiency is improved; in the process of detecting the calibration curve, a relationship is established among the voltage, the motion amount and the flow opening by using a flow detection method, a curve relationship is established between the direct flow opening and the motion amount of the valve element, the calibration precision is improved, machine learning is carried out on flow detection points, more data points are trained, and a more accurate displacement-opening curve is fitted.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
The above embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (9)
1. An electrically controlled valve opening calibration system, comprising: the device comprises a control system (10), a compressed air source (1), a flowmeter (2), a flow velocity detector (3), a pressure sensor (6), a flow tube (9), an electromagnetic detection device (8) and a conduction rod (7); the flow tube (9) is connected to two ports of the electric control valve (4) and connected with the compressed air source (1) and the flowmeter (2) to form a closed loop, the two ports of the electric control valve (4) are respectively provided with the flow velocity detector (3) and the pressure sensor (6) to detect the flow velocity and the pressure of the two ports of the electric control valve (4), the conduction rod (7) is detachably connected to the outer end face of the valve core (4-1) and conducts the movement of the valve core (4-1) to the inside of the electromagnetic detection device (8) to cause the magnetic field change, and the magnetic field change in the inside of the electromagnetic detection device (8) continuously outputs an electric signal to be transmitted to the control system (10) to represent the movement of the valve core (4-1).
2. The system for calibrating the opening of the electric control valve according to claim 1, wherein a sucker is arranged at one end of the conduction rod (7) and can be detachably fixed with the end face of the valve core (4-1), the other end of the conduction rod (7) is arranged inside the electromagnetic detection device (8), a first magnet (8-1) is arranged at the end of the conduction rod, the first magnet (8-1) and the valve core (4-1) keep the same movement through the conduction rod (7), and the electromagnetic detection device (8) indirectly detects the movement of the valve core (4-1) through the movement detection of the first magnet (8-1).
3. The system for calibrating the opening of the electric control valve according to claim 2, wherein the electromagnetic detection device (8) further comprises a second magnet (8-3) and a metal rod (8-2), the second magnet (8-3) is fixed on one side of the electromagnetic detection device (8) and is arranged corresponding to the first electromagnet (8-1), a uniform variable magnetic field (8-4) is formed between the first electromagnet (8-1) and the second magnet (8-3), and the metal rod (8-2) performs cutting magnetic induction line motion at a constant speed in the variable magnetic field (8-4).
4. An electrically controlled valve opening calibration system according to claim 3, characterized in that the two ends of the metal rod (8-2) are connected with a regulating circuit, and generate an electric signal and transmit the electric signal to the control system (10).
5. The electronic control valve opening calibration system according to claim 1, characterized in that a laser sensor (11) is further disposed on the other side of the electronic control valve (4) to detect the precision of the calibrated position.
6. An electronic control valve opening calibration method, which is applied to the electronic control valve opening calibration system of any one of claims 1 to 5, and is characterized by comprising the following steps:
s1, connecting two ends of an electric control valve (4) into a flow tube (9), and setting the initial voltage and the initial opening position of a valve core (4-1);
s2, driving voltage is increased in a gradient mode, the voltage drives a valve core (4-1) of the electric control valve (4) to move, the motion of the valve core (4-1) is conducted to the electromagnetic detection device (8) through the conducting rod (7), and a current signal is output to the control system (10);
s3, converting the current signal into a moving signal by the control system (10) to obtain a displacement-voltage relation curve chart;
s4, randomly selecting voltage in a displacement-voltage relation curve graph, driving an electric control valve (4), keeping the position of a valve core (4-1) unchanged, detecting the position of the valve core (4-1) by a laser sensor (11), if the displacement amount accords with a curve parameter, finishing displacement point detection, and if the displacement amount does not accord with the curve parameter, covering the original parameter by a detection parameter;
s5, keeping the position of the valve core (4-1) unchanged after the detection of S4, introducing a constant-flow fluid into the inlet flow tube (9), and respectively arranging a flow rate detector (3) and a pressure sensor (6) on the inlet side and the outlet side of the electric control valve (4) to detect the flow rate and the pressure of the fluid on the two sides of the electric control valve (4);
s6, transmitting flow velocity and pressure values at two sides of the electric control valve (4) to a control system (10), and converting the control system (10) into the opening amount of the electric control valve (4);
s7, repeating S4-S6 to complete multi-point detection, establishing a data set of displacement-opening data of a plurality of detection points, training the data set by using a machine learning detection model, and finally fitting to obtain a displacement-opening relation curve graph.
7. The method for calibrating the opening of the electric control valve according to claim 6, wherein the step S2 specifically comprises: the end face of the valve core (4-1) is fixedly connected with one end of the conduction rod (7), and the motion of the valve core (4-1) is conducted into the electromagnetic detection device (8) through the conduction rod (7) and keeps the conducted motion state unchanged.
8. The method for calibrating the opening of the electric control valve according to claim 7, wherein when the conduction rod (7) conducts the movement of the valve core (4-1), the magnetic field inside the electromagnetic detection device (8) changes along with the movement of the conduction rod (7), and the output current signal also changes.
9. The method for calibrating the opening of the electric control valve according to claim 6, wherein the step S4 specifically comprises: the flow meter (2) controls the flow entering the electric control valve (4), the flow velocity detector (3) is respectively arranged at the inlet end and the outlet end of the electric control valve (4) to detect the flow velocity, and the pressure sensor (6) is respectively arranged at the inlet end and the outlet end of the electric control valve (4) to detect the pressure.
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