Flow expansion coefficient feedback control system and method

Abstract

The invention relates to a flow expansion coefficient feedback control system and method applied to the field of control, the system firstly uses a physical state monitoring module to detect physical state parameters of fluid in real time, and an adaptive coefficient calculation formula is called out from an expansion coefficient model library, so that a relative flow expansion coefficient is calculated; according to the flow expansion coefficient, the opening degree of the valve is accurately controlled according to the flow expansion coefficient, the flow control precision is effectively improved, in the process, the flow expansion coefficient is visually displayed through the control parameter adjusting module, then the valve is controlled in a light measurement mode, and therefore accurate control over the flow can be achieved according to feedback of the flow expansion coefficient. Moreover, the visual display of the flow expansion coefficient also facilitates the self-fault diagnosis of the valve, and also facilitates the manual precise control of a worker when a fault occurs.

Description

Technical Field

[0001] The present invention relates to a flow expansion coefficient feedback control system and method, and in particular to a flow expansion coefficient feedback control system and method applied in the control field. Background Art

[0002] The main function of the flow expansion coefficient is to correct the measurement error caused by temperature and pressure changes in the flowmeter, thereby improving the measurement accuracy and stability. Existing flow control methods often rely on flow meters for control, but the temperature and pressure of the fluid are changing, and relying solely on flow meters for control will affect the control accuracy.

[0003] In order to solve the problem of inaccurate flow meter control, a flow measurement method in the market adopts a differential pressure calculation design, which has a certain market share.

[0004] The Chinese patent CN112284471B specification discloses a universal differential pressure gas mass flow measurement method, which calculates and outputs the gas mass flow of the throttling device by inputting the outflow coefficient and expansion coefficient, pipe diameter and standard density of the medium of any throttling device into a preset gas mass flow algorithm. The present invention breaks through the traditional standard algorithm and adopts a new gas mass flow algorithm to calculate the instantaneous gas mass flow of any throttling device. In this way, the range required by the user is used as the measurement range of the measuring instrument, which conforms to the industry practice and does not need to be divided into multiple sections for processing; at the same time, it is suitable for any differential pressure throttling device in the current market, and can measure the gas mass of different pipe diameters (depending on the throttling device). According to the results of on-site measurements, the design data can be corrected in real time to achieve the purpose of accurate measurement, which greatly facilitates users and on-site services.

[0005] The specification of Chinese patent CN116519068A discloses a gas flow calculation method and system based on a differential pressure flowmeter. The patent obtains corresponding parameters to calculate the flow coefficient C and the expansion coefficient ε, and combines the data obtained in the calculation process and the calculation results with the standard density ρN of the gas to be measured, the operating absolute temperature T1 of the gas to be measured, the operating absolute pressure p1 of the gas to be measured, the standard absolute temperature TN of the gas to be measured, and the standard absolute pressure PN of the gas to be measured, and uses the optimized calculation formula to calculate the gas to be measured, which can effectively improve the accuracy of its volume calculation.

[0006] Although the prior art uses various methods to improve the calculation accuracy of the expansion coefficient, since the physical properties of the fluid are constantly changing, the flow expansion coefficient is also constantly changing, so it is difficult for the entire control system to adapt to the precise flow control under complex working conditions. Summary of the invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to improve the control accuracy of the control system under complex working conditions.

[0008] To solve the above problems, the present invention provides a flow expansion coefficient feedback control system and method, including a control system body, the control system body includes a flow detection module, a physical state monitoring module, an expansion coefficient calculation module, a control parameter adjustment module and a flow control execution module, the flow detection module includes an ultrasonic flow meter installed on a fluid delivery pipeline, the physical state monitoring module includes a temperature sensor and a pressure sensor, the expansion coefficient calculation module includes an expansion coefficient model library, an expansion coefficient formula calling unit and a coefficient calculation unit, and the control parameter adjustment module includes an expansion coefficient reading unit and a PID control parameter adjustment unit; The flow control execution module includes an electric ball valve body, the electric ball valve body includes a valve stem electrically connected to the valve, and a flow expansion coefficient visualization display box is installed on the side wall of the electric ball valve body, the inner wall of the flow expansion coefficient visualization display box is fixedly connected to a horizontal bracket, and two symmetrically distributed linear motors are installed on the bracket, the output ends of the two linear motors are connected to expansion coefficient visualization balls, and the two linear motors are electrically connected to the PID control parameter adjustment unit at the same time, the lower ends of the two expansion coefficient visualization balls are installed with vertically set spotlights, the flow expansion coefficient visualization display box includes a shell and an external transparent cover, the bottom of the flow expansion coefficient visualization display box is fixedly connected to a light detection processor, and the upper end of the light detection processor is fixedly connected to a photosensitive element, the light detection processor includes a light source detection unit and a control adjustment unit electrically connected to the photosensitive element, and the control adjustment unit is electrically connected to the electric actuator of the electric ball valve body.

[0009] In the above-mentioned flow expansion coefficient feedback control system, the flow expansion coefficient is calculated by real-time monitoring of the fluid physical state parameters, and this is fed back to the valve actuator, thereby effectively improving the accuracy of flow control, and can also achieve self-fault diagnosis and display it in an intuitive form, which is convenient for manual precise control in emergency situations.

[0010] As a further improvement of the present application, the control system body also includes a fault diagnosis module, which includes a rotation angle detection unit and an opening and closing degree comparison unit. The fault diagnosis module is used to detect whether the electric actuator of the electric ball valve body has a fault. The rotation angle detection unit detects the rotation angle of the valve in real time, and the opening and closing degree comparison unit compares the rotation angle with the data detected by the light source detection unit. If the two data are the same, it means that there is no fault. If there is a difference between the two data, it means that the electric ball valve body has a fault, thereby timely discovering and diagnosing problems and effectively reducing maintenance costs and downtime.

[0011] As a further improvement and supplement to the present application, the rotation angle detection unit includes a manual control box installed on the upper end of the electric ball valve body, and the manual control box includes an annular hollow shell and a transparent cover on the upper part, the valve stem passes through the manual control box, and the side wall of the valve stem is fixedly connected to two symmetrically distributed pointers, the pointers pass through the interior of the manual control box, the interior of the manual control box is fixedly connected to two symmetrically distributed resistors, and the end of the pointer away from the valve stem is fixedly connected to a measuring block in contact with the resistor, the electric actuator of the electric ball valve body drives the valve stem to rotate while opening the valve, and the valve stem then drives the pointer and the measuring block to rotate on the resistor, the rotation angle detection unit detects the resistance value between the 0° position and the measuring block, and by corresponding each resistance value to the angle scale line, the rotation angle of the valve stem can be detected, wherein, the larger the angle of rotation of the measuring block, the greater the distance between it and 0°, which indicates that the resistance value is also greater.

[0012] As a further improvement of the present application, the control system body also includes an emergency control module, which includes an alarm electrically connected to the opening and closing degree comparison unit, and the outer surface of the manual control box is provided with two symmetrically distributed angle scale lines, and the range of the two angle scale lines is 0-90°, and the upper ends of the two expansion coefficient visualization balls are installed with vertically arranged spotlights 2, and the spotlights 2 are coaxial with the spotlights, and the upper end side wall of the flow expansion coefficient visualization display box is fixedly connected to a light guide seat, and the side walls of the light guide seat are fixedly inlaid with multiple equally spaced fluorescent strips, and the transparent cover of the flow expansion coefficient visualization display box is provided with a 45° -0°-45° scale lines, and multiple fluorescent bars are evenly distributed according to the degrees on the scale lines. When the opening and closing degree comparison unit detects that the electric ball valve body has a fault, the alarm is immediately triggered, and the worker immediately enters the workstation to manually turn the valve stem. During the movement of the expansion coefficient visualization ball, the rays emitted by the second spotlight shine on the fluorescent bar to make it glow. Each fluorescent bar corresponds to an angle, so when the worker turns the valve stem, he can know the angle to which the valve stem needs to be turned by reading the values ​​on the scale lines and adding them up. In an emergency, the worker can still accurately control the flow, effectively preventing potential equipment damage or production accidents.

[0013] As a further improvement of the present application, the opposite side walls of the two expansion coefficient visualization balls are fixedly inlaid with conductive sheets, and when the two conductive sheets are in contact, the PID control parameter adjustment unit adjusts the electric ball valve body to a fully closed state. Due to the volume of the two expansion coefficient visualization balls, when the two expansion coefficient visualization balls are in the starting position, the light emitted by spotlight 2 is not on the 0° line, which will cause control errors. Therefore, the conduction effect of the two conductive sheets when they are in contact is used to control the electric ball valve body to be in a fully closed state.

[0014] As another improvement of the present application, the measuring block includes a wear compensation seat, and a measuring electrode is fixedly connected to the lower end of the wear compensation seat. The measuring electrode is in contact with the resistor sheet. The measuring electrode plays a measuring role, which is convenient for measuring the resistance value of the resistor sheet when the measuring block is at the 0° position. In order to ensure that the measuring electrode and the resistor sheet can be conductive, the elastic force of the wear compensation seat is used to make the measuring electrode and the resistor sheet fit tightly.

[0015] As another improved supplement of the present application, the wear compensation seat includes two upper and lower covers, and an elastic edge seal is fixedly connected between the two covers. The interior of the elastic edge seal is filled with an elastic net. The elastic force of the elastic edge seal and the elastic net is used to press down the measuring electrode, thereby effectively improving the tightness of the fit between the measuring electrode and the resistor sheet. In addition, the measuring electrode will also be worn during long-term use, so the elastic force can well compensate for the gap between the measuring electrode and the resistor sheet.

[0016] As another improvement of the present application, the control method of the control system includes the following steps: S1. The ultrasonic flow meter monitors the flow rate of the fluid in real time, and the temperature sensor and the pressure sensor monitor the temperature and pressure of the fluid in real time. According to the measured temperature and pressure data, the expansion coefficient formula calling unit calls out the applicable calculation formula from the expansion coefficient model library, and then the coefficient calculation unit calculates the expansion coefficient using the formula; S2, the expansion coefficient reading unit first obtains the calculated expansion coefficient, and then transmits the expansion coefficient to the PID control parameter adjustment unit. The PID control parameter adjustment unit controls the linear motor to move to adjust the distance between the two expansion coefficient visualization balls. The spotlight emits rays downward to irradiate the photosensitive element. The light source detection unit detects the distance between the two rays. The size of the distance between the two rays represents the size of the opening and closing angle of the electric ball valve body. The control adjustment unit uses this parameter to control the opening and closing degree of the electric ball valve body, thereby achieving the purpose of accurately controlling the flow rate according to the real-time feedback of the expansion coefficient. S3. During the opening process of the electric ball valve, the valve stem drives the pointer to rotate, and the measuring block moves on the resistor. When the valve is closed, the position indicated by the pointer is 0°. When the measuring block rotates a certain angle, the rotation angle detection unit calculates the angle by detecting the arc length of the measuring block to the 0° position. This angle is the opening and closing angle of the valve. Then, the opening and closing degree comparison unit compares this opening and closing angle with the opening and closing angle measured by the light source detection unit. If the two data are consistent, it indicates that the entire control system is working normally. If there is a difference between the two, it indicates that the electric ball valve body is faulty, thereby realizing self-fault diagnosis of the control system. S4. When a fault is diagnosed, the system immediately triggers the emergency control module, and then starts the alarm to sound an alarm, allowing workers to perform manual control. In the manual control stage, two spotlights emit rays upward, and the rays shine on the fluorescent strip to make it emit. The worker can know the opening and closing angle of the electric ball valve body by reading the degree between the two fluorescent strips and adding the numerical values, and then turn the valve stem by hand. When the pointer indicates the corresponding angle, stop turning the valve stem. In this way, the flow can also be accurately controlled manually.

[0017] To summarize, the physical state monitoring module is first used to detect the physical state parameters of the fluid in real time, and the adapted coefficient calculation formula is called out from the expansion coefficient model library to calculate the relative flow expansion coefficient, and then the valve opening is accurately controlled according to the flow expansion coefficient, effectively improving the flow control accuracy. In this process, the control parameter adjustment module first visualizes the flow expansion coefficient, and then uses optical measurement to control the valve, so that the flow can be accurately controlled according to the feedback of the flow expansion coefficient. The intuitive display of the flow expansion coefficient also facilitates the self-fault diagnosis of the valve, and it is also convenient for workers to perform manual precise control when a fault occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a module schematic diagram of a control system according to a first embodiment of the present application; Figure 2 A three-dimensional diagram of an electric ball valve according to a first embodiment of the present application; Figure 3 This is a top cross-sectional view of a manual control box according to a second embodiment of the present application; Figure 4 This is a positional relationship diagram of a measuring block and a resistor sheet in a second embodiment of the present application; Figure 5 This is a front cross-sectional view of a measuring block according to a second embodiment of the present application; Figure 6 This is a front view of a flow expansion coefficient visualization display box according to the first embodiment of the present application; Figure 7 This is a working state diagram of the manual control box of the second embodiment of the present application during control; Figure 8 This is a front view of the expansion coefficient visualization ball of the second embodiment of the present application when in operation; Fig. 9 This is a cross-sectional view of the expansion coefficient visualization ball at the initial position according to the first embodiment of the present application.

[0019] Description of the numbers in the figure: 1 Electric ball valve body, 2 valve stem, 3 manual control box, 4 resistor, 5 pointer, 6 measuring block, 601 wear compensation seat, 6011 sealing cover, 6012 elastic edge sealing, 6013 elastic net, 602 measuring electrode, 7 flow expansion coefficient visualization display box, 8 bracket, 9 expansion coefficient visualization ball, 901 linear motor, 902 conductive sheet, 10 spotlight one, 11 light detection processor, 12 photosensitive element, 13 spotlight two, 14 light guide seat, 15 fluorescent strip. DETAILED DESCRIPTION

[0020] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0021] The first implementation method: Figure 1 As shown, it includes a control system body, the control system body includes a flow detection module, a physical state monitoring module, an expansion coefficient calculation module, a control parameter adjustment module and a flow control execution module, the flow detection module includes an ultrasonic flowmeter installed on a fluid delivery pipeline, the physical state monitoring module includes a temperature sensor and a pressure sensor, the expansion coefficient calculation module includes an expansion coefficient model library, an expansion coefficient formula calling unit and a coefficient calculation unit, and the control parameter adjustment module includes an expansion coefficient reading unit and a PID control parameter adjustment unit (the specific connection structure and control principle of the modules in this part are well-known technologies to technicians in the relevant field and will not be described in detail here); Figure 2 , 6 and Fig. 9It is shown that the flow control execution module includes an electric ball valve body 1, the electric ball valve body 1 includes a valve stem 2 electrically connected to the valve, and a flow expansion coefficient visualization display box 7 is installed on the side wall of the electric ball valve body 1, and a horizontal bracket 8 is fixedly connected to the inner wall of the flow expansion coefficient visualization display box 7, and two symmetrically distributed linear motors 901 are installed on the bracket 8 (the specific model is selected according to actual needs and is not described in detail here), the output ends of the two linear motors 901 are connected to expansion coefficient visualization balls 9, and the two linear motors 901 are electrically connected to the PID control parameter adjustment unit at the same time, the opposite side walls of the two expansion coefficient visualization balls 9 are fixedly inlaid with conductive sheets 902, and when the two conductive sheets 902 are attached to each other, the PID control parameter adjustment unit adjusts the electric ball valve body 1 to a fully closed state (the specific circuit control principle of this part is a well-known technology for technicians in the relevant field and is not described in detail here), due to the volume of the two expansion coefficient visualization balls 9 The reason is that when the two expansion coefficient visualization balls 9 are in the starting position, the light emitted by the spotlight 13 is not on the 0° line, which will cause a control error. Therefore, the conduction effect of the two conductive sheets 902 when in contact is used to control the electric ball valve body 1 to be in a completely closed state. The lower ends of the two expansion coefficient visualization balls 9 are each installed with a vertically arranged spotlight 10 (the specific model is selected according to actual needs and is not described in detail here). The flow expansion coefficient visualization display box 7 includes a shell and an external transparent cover. The bottom of the flow expansion coefficient visualization display box 7 is fixedly connected to a light detection processor 11, and the upper end of the light detection processor 11 is fixedly connected to a photosensitive element 12. The light detection processor 11 includes a light source detection unit and a control adjustment unit electrically connected to the photosensitive element 12 (the specific structure and working principle of the photosensitivity detection are well-known technologies to technicians in the relevant field and are not described in detail here), and the control adjustment unit is electrically connected to the electric actuator of the electric ball valve body 1.

[0022] The second implementation method: Figure 1 As shown, the control system body also includes a fault diagnosis module, which includes a rotation angle detection unit and an opening and closing degree comparison unit. The fault diagnosis module is used to detect whether the electric actuator of the electric ball valve body 1 has a fault. The rotation angle detection unit detects the rotation angle of the valve in real time, and the opening and closing degree comparison unit compares the rotation angle with the data detected by the light source detection unit. If the two data are the same, it means that there is no fault. If there is a difference between the two data, it means that the electric ball valve body 1 has a fault, so as to timely discover and diagnose the problem, effectively reducing maintenance costs and downtime; Figure 2 , 3As shown, the rotation angle detection unit includes a manual control box 3 installed on the upper end of the electric ball valve body 1, and the manual control box 3 includes an annular hollow shell and an upper transparent cover, the valve stem 2 passes through the manual control box 3, and the side wall of the valve stem 2 is fixedly connected to two symmetrically distributed pointers 5, the pointers 5 pass through the interior of the manual control box 3, the interior of the manual control box 3 is fixedly connected to two symmetrically distributed resistors 4, and the end of the pointer 5 away from the valve stem 2 is fixedly connected to a measuring block 6 in contact with the resistor 4, the electric actuator of the electric ball valve body 1 drives the valve stem 2 to rotate while opening the valve, and the valve stem 2 then drives the pointer 5 and the measuring block 6 to rotate on the resistor 4, the rotation angle detection unit detects the resistance value between the 0° position and the measuring block 6, and by matching each resistance value with the angle scale line, the rotation angle of the valve stem 2 can be detected, wherein, the greater the angle of rotation of the measuring block 6, the greater the distance between it and 0°, which indicates that the resistance value is also greater; Figure 4 , 5 As shown, the measuring block 6 includes a wear compensation seat 601, and the lower end of the wear compensation seat 601 is fixedly connected with a measuring electrode 602, the measuring electrode 602 is in contact with the resistor 4, and the measuring electrode 602 plays a measuring role, which is convenient for measuring the resistance value of the resistor 4 at the 0° position of the measuring block 6. In order to ensure that the measuring electrode 602 and the resistor 4 can be turned on, the elastic force of the wear compensation seat 601 is used to make the measuring electrode 602 and the resistor 4 fit tightly. The wear compensation seat 601 includes two upper and lower covers 6011, and the two covers 6011 are fixedly connected with an elastic The edge seal 6012 (preferably made of insulating rubber material, other materials can also be selected according to actual needs), the elastic edge seal 6012 is filled with an elastic net 6013 (preferably made of insulating rubber material, other materials can also be selected according to actual needs), relying on the elastic force of the elastic edge seal 6012 and the elastic net 6013 to press down the measuring electrode 602, thereby effectively improving the tightness of the measuring electrode 602 and the resistor 4. In addition, the measuring electrode 602 will also be worn during long-term use, so the elastic force can well compensate for the gap between the measuring electrode 602 and the resistor 4; Figure 7 , 8It is shown that the control system body also includes an emergency control module, which includes an alarm electrically connected to the opening and closing degree comparison unit. The outer surface of the manual control box 3 is provided with two symmetrically distributed angle scales, and the range of the two angle scales is 0-90°. The upper ends of the two expansion coefficient visualization balls 9 are both installed with vertically arranged spotlights 13 (the specific model is selected according to actual needs and is not described in detail here), and the spotlights 13 and 10 are coaxial. The upper side wall of the flow expansion coefficient visualization display box 7 is fixedly connected with a light guide seat 14, and the side wall of the light guide seat 14 is fixedly inlaid with a plurality of equally spaced fluorescent strips 15. The transparent flow expansion coefficient visualization display box 7 The cover is provided with scale lines ranging from 45° to 0° to 45°, and a plurality of fluorescent strips 15 are evenly distributed according to the degrees on the scale lines. When the opening and closing degree comparison unit detects that the electric ball valve body 1 is faulty, the alarm is immediately triggered, and the worker immediately enters the workstation to manually rotate the valve stem 2. During the movement of the expansion coefficient visualization ball 9, the rays emitted by the spotlight 2 13 irradiate the fluorescent strip 15 to make it glow. Each fluorescent strip 15 corresponds to an angle, so that when the worker rotates the valve stem 2, by reading the values ​​on the scale lines and adding them up, the worker can know the angle to which the valve stem 2 needs to be rotated. In an emergency, the worker can still accurately control the flow, effectively preventing potential equipment damage or production accidents. Figure 1 , 2 , 7 and Figure 8 It is shown that the control method of the control system includes the following steps: S1. The ultrasonic flow meter monitors the flow rate of the fluid in real time, and the temperature sensor and the pressure sensor monitor the temperature and pressure of the fluid in real time. According to the measured temperature and pressure data, the expansion coefficient formula calling unit calls out the applicable calculation formula from the expansion coefficient model library, and then the coefficient calculation unit calculates the expansion coefficient using the formula; S2, the expansion coefficient reading unit first obtains the calculated expansion coefficient, and then transmits the expansion coefficient to the PID control parameter adjustment unit, the PID control parameter adjustment unit controls the linear motor 901 to move to adjust the distance between the two expansion coefficient visualization balls 9, the spotlight 10 emits rays downward to irradiate the photosensitive element 12, the light source detection unit detects the distance between the two rays, the size of the distance between the two rays represents the size of the opening and closing angle of the electric ball valve body 1, the control adjustment unit uses this parameter to control the opening and closing degree of the electric ball valve body 1, so as to achieve the purpose of accurately controlling the flow rate according to the real-time feedback of the expansion coefficient; S3. During the process of opening the valve of the electric ball valve body 1, the valve stem 2 drives the pointer 5 to rotate, and the measuring block 6 moves on the resistor 4. When the valve is closed, the position indicated by the pointer 5 is 0°. When the measuring block 6 rotates a certain angle, the rotation angle detection unit calculates the angle by detecting the arc length of the measuring block 6 to the 0° position. This angle is the opening and closing angle of the valve. Then, the opening and closing degree comparison unit compares this opening and closing angle with the opening and closing angle measured by the light source detection unit. If the two data are consistent, it indicates that the entire control system is working normally. If there is a difference between the two, it indicates that the electric ball valve body 1 is faulty, thereby realizing self-fault diagnosis of the control system; S4. When a fault is diagnosed, the system immediately triggers the emergency control module, and then starts the alarm to sound an alarm, allowing workers to perform manual control. In the manual control stage, the two spotlights 13 emit rays upward, and the rays shine on the fluorescent strip 15 to emit them. The worker can know the opening and closing angle of the electric ball valve body 1 by reading the degree between the two fluorescent strips 15 and adding the numerical values, and then turn the valve stem 2 by hand. When the pointer 5 indicates the corresponding angle, the valve stem 2 is stopped. In this way, the flow can also be accurately controlled manually.

[0023] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A flow expansion coefficient feedback control system, characterized in that: It includes a control system body, which includes a flow detection module, a physical state monitoring module, an expansion coefficient calculation module, a control parameter adjustment module and a flow control execution module, wherein the flow detection module includes an ultrasonic flow meter installed on a fluid delivery pipeline, the physical state monitoring module includes a temperature sensor and a pressure sensor, the expansion coefficient calculation module includes an expansion coefficient model library, an expansion coefficient formula calling unit and a coefficient calculation unit, and the control parameter adjustment module includes an expansion coefficient reading unit and a PID control parameter adjustment unit; The flow control execution module comprises an electric ball valve body (1), the electric ball valve body (1) comprises a valve stem (2) electrically connected to the valve, and a flow expansion coefficient visualization display box (7) is installed on the side wall of the electric ball valve body (1), a horizontal bracket (8) is fixedly connected to the inner wall of the flow expansion coefficient visualization display box (7), and two symmetrically distributed linear motors (901) are installed on the bracket (8), the output ends of the two linear motors (901) are both connected to the expansion coefficient visualization ball (9), and the two linear motors (901) are simultaneously connected to the PID control parameter adjustment unit The two expansion coefficient visualization balls (9) are electrically connected, and the lower ends of the two expansion coefficient visualization balls (9) are both installed with a vertically arranged spotlight (10). The flow expansion coefficient visualization display box (7) comprises a shell and an external transparent cover. The bottom of the flow expansion coefficient visualization display box (7) is fixedly connected with a light detection processor (11), and the upper end of the light detection processor (11) is fixedly connected with a photosensitive element (12). The light detection processor (11) comprises a light source detection unit and a control adjustment unit electrically connected to the photosensitive element (12), and the control adjustment unit is electrically connected to the electric actuator of the electric ball valve body (1).

2. A flow expansion coefficient feedback control system according to claim 1, characterized in that: The control system body further includes a fault diagnosis module, which includes a rotation angle detection unit and an opening and closing degree comparison unit.

3. A flow expansion coefficient feedback control system according to claim 2, characterized in that: The rotation angle detection unit comprises a manual control box (3) mounted on the upper end of the electric ball valve body (1), and the manual control box (3) comprises an annular hollow shell and an upper transparent cover, the valve stem (2) passes through the manual control box (3), and the side wall of the valve stem (2) is fixedly connected to two symmetrically distributed pointers (5), the pointers (5) pass through the interior of the manual control box (3), the interior of the manual control box (3) is fixedly connected to two symmetrically distributed resistors (4), and the end of the pointer (5) away from the valve stem (2) is fixedly connected to a measuring block (6) in contact with the resistor (4).

4. A flow expansion coefficient feedback control system according to claim 1, characterized in that: The control system body also includes an emergency control module, which includes an alarm electrically connected to the opening and closing degree comparison unit. The outer surface of the manual control box (3) is provided with two symmetrically distributed angle scale lines, and the range of the two angle scale lines is 0-90°. The upper ends of the two expansion coefficient visualization balls (9) are both installed with vertically arranged spotlights 2 (13), and the spotlights 2 (13) are coaxial with the spotlights 1 (10). The upper side wall of the flow expansion coefficient visualization display box (7) is fixedly connected to a light guide seat (14), and the side wall of the light guide seat (14) is fixedly inlaid with a plurality of fluorescent strips (15) distributed at equal intervals. The transparent cover of the flow expansion coefficient visualization display box (7) is provided with scale lines in the range of 45°-0°-45°, and the plurality of fluorescent strips (15) are evenly distributed according to the degrees on the scale lines.

5. A flow expansion coefficient feedback control system according to claim 1, characterized in that: The opposite side walls of the two expansion coefficient visualization balls (9) are both fixedly inlaid with conductive sheets (902), and when the two conductive sheets (902) are in contact with each other, the PID control parameter adjustment unit adjusts the electric ball valve body (1) to a fully closed state.

6. A flow expansion coefficient feedback control system according to claim 1, characterized in that: The measuring block (6) comprises a wear compensation seat (601), and a measuring electrode (602) is fixedly connected to the lower end of the wear compensation seat (601), and the measuring electrode (602) is in contact with the resistor sheet (4).

7. A flow expansion coefficient feedback control system according to claim 6, characterized in that: The wear compensation seat (601) comprises two upper and lower sealing covers (6011), and an elastic sealing edge (6012) is fixedly connected between the two sealing covers (6011), and the interior of the elastic sealing edge (6012) is filled with an elastic net (6013).

8. A flow expansion coefficient feedback control system according to claims 1-7, characterized in that: The control method of the control system comprises the following steps: S1. The ultrasonic flow meter monitors the flow rate of the fluid in real time, and the temperature sensor and the pressure sensor monitor the temperature and pressure of the fluid in real time. According to the measured temperature and pressure data, the expansion coefficient formula calling unit calls out the applicable calculation formula from the expansion coefficient model library, and then the coefficient calculation unit calculates the expansion coefficient using the formula; S2, the expansion coefficient reading unit first obtains the calculated expansion coefficient, and then transmits the expansion coefficient to the PID control parameter adjustment unit. The PID control parameter adjustment unit controls the linear motor (901) to move to adjust the distance between the two expansion coefficient visualization balls (9). The spotlight (10) emits rays downward to illuminate the photosensitive element (12). The light source detection unit detects the distance between the two rays. The size of the distance between the two rays represents the size of the opening and closing angle of the electric ball valve body (1). The control adjustment unit uses this parameter to control the opening and closing degree of the electric ball valve body (1), thereby achieving the purpose of accurately controlling the flow rate according to the real-time feedback of the expansion coefficient. S3. During the process of opening the valve of the electric ball valve body (1), the valve stem (2) drives the pointer (5) to rotate, and the measuring block (6) moves on the resistor (4). When the valve is closed, the position indicated by the pointer (5) is 0°. When the measuring block (6) rotates a certain angle, the rotation angle detection unit calculates the angle by detecting the arc length from the measuring block (6) to the 0° position. This angle is the opening and closing angle of the valve. Then, the opening and closing degree comparison unit compares this opening and closing angle with the opening and closing angle measured by the light source detection unit. If the two data are consistent, it indicates that the entire control system is working normally. If there is a difference between the two, it indicates that the electric ball valve body (1) has a fault, thereby realizing self-fault diagnosis of the control system; S4. When a fault is diagnosed, the system immediately triggers the emergency control module, and then activates the alarm to sound an alarm, allowing the worker to perform manual control. In the manual control stage, the two spotlights (13) emit rays upward, and the rays shine on the fluorescent strip (15) to emit light. The worker can know the opening and closing angle of the electric ball valve body (1) by reading the degree between the two fluorescent strips (15) and adding the values, and then turn the valve stem (2) by hand. When the pointer (5) indicates the corresponding angle, the valve stem (2) stops turning. In this way, the flow rate can also be accurately controlled manually.

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