Mechanical electric valve positioner and range adjustment method

Abstract

The application discloses a mechanical electrical valve positioner and a range adjusting method, and belongs to the technical field of electrical valve positioners. The mechanical electrical valve positioner and the range adjusting method comprise a positioner, a spring sheet group is arranged in the positioner, a diaphragm plate is arranged above the spring sheet group, and a leather cup is sleeved on the outer wall of the upper side of the diaphragm plate. The application solves the problems that the existing feedback spring cannot select a position according to needs, the overall adaptability is low, the gain cannot be changed, and the positioner cannot be well positioned. The application can select a position according to needs through an inner feedback spring. The positioner is assembled to the cylinder air chamber of an actuator, the volume of the cylinder air chamber is different, the position is also different, and the gain is changed, so that the positioner can be rapidly and stably positioned. The installation of the bidirectional screw thread is convenient, the stability of connection is increased, the inner and outer bidirectional extrusion sealing is used, the sealing property of the connection position is improved, and leakage is effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of electric valve positioner technology, specifically a mechanical electric valve positioner and a range adjustment method. Background Technology

[0002] The valve positioner is a key accessory for control valves, typically used in conjunction with pneumatic control valves. It receives the output signal from the controller and then uses its output signal to control the pneumatic control valve. After the control valve actuates, the displacement of the valve stem is fed back to the valve positioner via a mechanical device, and the valve position status is transmitted to the upper-level system via an electrical signal.

[0003] Chinese Patent Publication No. CN213685523U discloses a valve positioner adjustment device, including a housing, a test lever inside the housing, a first spline block sleeved on the outside of the rotating shaft of the test lever, and the first spline block being fixedly connected to the test lever; a pressing mechanism is provided on the upper part of the housing, and a second spline block is connected to the lower part of the pressing mechanism, the second spline block cooperating with the first spline block; by setting a button post on the outside of the housing, when it is necessary to adjust the initial position of the lever, the two splines engage after pressing down, and the accuracy of the initial state can be adjusted by rotating the adjustment lever; when the button post is released, the splines disengage, and the rotation of the lever during operation is not affected.

[0004] In actual use, the feedback spring of the valve positioner in the above patent cannot be selected according to the needs, resulting in low overall adaptability, inability to change the gain, and inability of the positioner to position well; therefore, it does not meet the existing requirements. In response, we propose a mechanical-electric valve positioner and a range adjustment method. Summary of the Invention

[0005] The purpose of this invention is to provide a mechanical electric valve positioner and a range adjustment method. The position can be selected as needed via an internal feedback spring. The position of the positioner varies depending on the volume of the cylinder chamber of the actuator, thus changing the gain and enabling the positioner to be positioned quickly and stably. The bidirectional threaded installation facilitates easy assembly and disassembly and increases connection stability. The internal and external bidirectional compression sealing improves the sealing performance at the connection, effectively preventing leakage. The position of the spool valve seat can be adjusted as needed, increasing the convenience of directional adjustment. This allows the valve positioner to increase the output power of the regulating valve and reduce the occurrence of signal transmission lag, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mechanical electric valve positioner, comprising a positioner, wherein a spring plate assembly is provided inside the positioner, a diaphragm plate is provided above the spring plate assembly, and a leather cup is wrapped around the upper outer wall of the diaphragm plate, and the diaphragm plate and the leather cup are disposed inside the outer shell;

[0007] A nozzle is provided below the diaphragm plate, and a balance bar is provided below the nozzle;

[0008] One end of the diaphragm plate is connected to a spool valve core, and a spool valve seat is sleeved below the spool valve core. The spool valve seat is installed inside the steering device, and one end of the steering device is connected to the actuator through a pipe.

[0009] One end of the balance bar is respectively wound with an inner feedback spring and an outer feedback spring. One end of the inner feedback spring is connected to the zero-adjustment nut, and the upper part of the zero-adjustment nut is connected to the spring plate group. The other end of the balance bar is connected to the force coil. The force coil is set on both sides of the permanent magnet. The force coil and the permanent magnet are set inside the housing. The balance bar is mounted on the housing through bearings.

[0010] One end of the external feedback spring is connected to the cross arm, and one end of the cross arm is equipped with a roller that fits against the cam. One end of the cam's mounting shaft is connected to the actuator through an I-beam hinge, and the I-beam hinge is equipped with a rotating shaft and a rotating sleeve.

[0011] Preferably, the outer shell has a cavity, which is located above the diaphragm plate and the cup. One side of the cavity is connected to the nozzle installation pipe through a slot.

[0012] Preferably, the actuator includes a housing, a piston plate, an output rod, an upper connecting pipe, a lower connecting pipe, an upper connector, and a lower connector. An air groove is provided inside the housing. The piston plate is fitted inside the housing. The output rod is connected to the lower part of the piston plate and is connected to an I-beam hinge. The upper connecting pipe is connected to the top of the housing, and the lower connecting pipe is connected to the bottom of the housing. An upper connector is installed on the upper connecting pipe, and a lower connector is installed on the lower connecting pipe. The upper connecting pipe is connected to one pipe of the steering device via the upper connector, and the lower connecting pipe is connected to another pipe of the steering device via the lower connector.

[0013] Preferably, the upper connector includes a connector head, an inner sleeve ring, an outer sleeve ring, a sealing sleeve, and an inner gasket. The connector head is fixed to the pipe by a bearing. The inner sleeve ring is connected to the upper pipe. The outer sleeve ring covers the outer side of the inner sleeve ring. The connector head is inserted into the inner sleeve ring and the outer sleeve ring. The connection between the inner sleeve ring and the outer sleeve ring is covered by a sealing sleeve. An inner gasket is provided on the front end face of the inner sleeve ring.

[0014] Preferably, the inner ring and the outer surface of the connector are both provided with external threads, and the outer ring and the inner wall of the connector are both provided with internal threads. The inner wall of the connector is screwed into the thread of the connector through the internal threads.

[0015] Preferably, the steering device includes a steering body, a first channel, a second channel, a directional adjustment component, and a directional groove. The steering body has a directional groove, one side of which is connected to the first channel and the second channel respectively. The first channel is connected to a lower pipe through a pipe, and the second channel is connected to an upper pipe through a pipe. A directional adjustment component is installed in the directional groove. One end of the spool valve core and the spool valve seat are installed in the directional groove, and multiple spool valve seats are provided to block multiple outlets in the directional groove.

[0016] Preferably, the directional adjustment assembly includes a first air regulating groove, a second air regulating groove, a first air regulating pipe, a second air regulating pipe, and a shut-off valve. The first air regulating groove is disposed on a steering body between two spool valve seats above the directional groove, and the second air regulating groove is disposed on a steering body between two spool valve seats below the directional groove. The first air regulating groove is connected to the first air regulating pipe at its rear, and the second air regulating groove is connected to the second air regulating pipe at its rear. A shut-off valve is fitted onto both the first air regulating pipe and the second air regulating pipe.

[0017] Preferably, the locator is also equipped with a control system, which includes a main control module, a signal conversion module, an execution module, and a signal recognition module. The main control module interfaces with the signal conversion module and the execution module, the execution module interfaces with the locator, and the main control module interfaces with the signal recognition module.

[0018] The present invention also provides a method for adjusting the range of a mechanical electric valve positioner, comprising the following steps:

[0019] Step 1: The signal conversion module receives the electrical signal and converts it into a pneumatic signal to drive the regulating valve. The main control module then sends control commands to the regulating valve through the pneumatic signal.

[0020] Step 2: The execution module executes the instructions issued by the main control module and controls the action of the regulating valve, enabling intelligent range adjustment;

[0021] Step 3: The signal recognition module identifies the correspondence between the electrical signal and the measurement range, finds the available measurement range, and the main control module adjusts the stroke to the specified position.

[0022] Furthermore, the signal conversion module also includes:

[0023] Step 1: Acquire the electrical signal and convert it into a corresponding gas signal;

[0024] Step 2: At the same time as sending the gas signal to the main control module, send the electrical signal to the main control module as well.

[0025] Step 3: After the main control module acquires the electrical signal, it extracts whether there is a historical electrical signal with the same value as the electrical signal in the historical record of electrical signal reception; if there is no historical electrical signal with the same value as the electrical signal, then the fourth step is executed; if there is a historical electrical signal with the same value as the electrical signal, then the fifth step is executed.

[0026] Step 4: The control command corresponding to the gas signal issued by the main control module is sent to the execution module;

[0027] Step 5: Retrieve the gas signal value corresponding to the historical electrical signal, compare the gas signal value corresponding to the historical electrical signal with the gas signal value corresponding to the current electrical signal, and determine whether one or more differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceed a preset first difference threshold.

[0028] Step 6: If the difference between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal does not exceed the preset first difference threshold, then proceed to step 4; if any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds the preset first difference threshold, then proceed to step 7.

[0029] Step 7: Based on the gas signal corresponding to the historical electrical signal and the gas signal corresponding to the current electrical signal, obtain the gas signal value corresponding to the electrical signal, use the gas signal value as the target gas signal, and send it to the execution module according to the control command corresponding to the target gas signal; wherein, the target gas signal is obtained by the following formula:

[0030]

[0031] Among them, Q z Q represents the value corresponding to the target gas signal; Q1 represents the gas signal value corresponding to the first electrical signal that appears in the historical electrical signals; n represents the number of electrical signals in the historical electrical signals; Q 01 Q represents the value corresponding to the first difference threshold; i Q represents the gas signal value corresponding to the i-th electrical signal in the historical electrical signals; d Q represents the gas signal value corresponding to the current electrical signal; e This indicates the preset allowable error value.

[0032] Step 8: When the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module exceeds the preset second difference threshold, an alarm is triggered.

[0033] Furthermore, when the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module exceeds a preset second difference threshold, an alarm is triggered, including:

[0034] The difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module is compared to obtain the difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module.

[0035] The second difference threshold is obtained by using one or more difference values ​​between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal, and the relationship between these values ​​and the first difference threshold.

[0036]

[0037] Among them, Q 02 The second difference threshold is represented; m represents the number of times in the historical electrical signals, any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds the preset first difference threshold.

[0038] The difference value is compared with a preset second difference threshold, and an alarm is triggered when the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module exceeds the preset second difference threshold.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] 1. This invention features a cavity within the outer casing, positioned above the diaphragm plate and the cup. One side of the cavity is connected to the nozzle mounting pipe via a slot. A force coil, located in the magnetic field of a permanent magnet, generates a torque proportional to the current signal of the balance bar. An external feedback spring generates a counter-torque proportional to the position of the actuator. This position, acting as a relative displacement, is transmitted to the end of the external feedback spring via a cylinder, I-beam hinge, feedback shaft, and cam. The nozzle senses the torque balance on the balance bar. Five internal feedback spring mounting positions are provided on the balance bar, allowing for position selection as needed. The position of the positioner varies depending on the volume of the cylinder chamber on the actuator, thus altering the gain and enabling the positioner to quickly and stably position itself.

[0041] 2. This invention connects the connector with an inner and outer ring through an insertion process. A sealing sleeve covers the connection between the inner and outer rings. An inner gasket is provided on the front end face of the inner ring. External threads are provided on the outer surfaces of both the inner ring and the connector, while internal threads are provided on the inner walls of both the outer ring and the connector. The inner wall of the connector is screwed into the connector thread via the internal threads. During installation, the connector on the pipe is inserted into the outer ring, and the connector is rotated to screw the inner ring into the connector. Simultaneously, the connector is screwed into the outer ring. The front end of the inner ring and the inner opening of the connector are sealed by the inner gasket, and the front end of the connector and the inner end face of the outer ring are sealed by the sealing sleeve. The bidirectional threaded installation facilitates easy assembly and disassembly, increases connection stability, and the bidirectional sealing improves the sealing performance of the connection, effectively preventing leakage.

[0042] 3. In this invention, a directional adjustment assembly is installed in the directional groove via a pipe connected to the upper pipe in the second channel. One end of the spool valve core and the spool valve seat are located in the directional groove, and multiple spool valve seats are provided to block multiple outlets in the directional groove. When the input signal increases, the back pressure near the nozzle of the balance bar increases, which will cause the cup, spring plate assembly, and spool valve core to move upward. The spool valve distributes compressed air to the upper side of the actuator piston through the first channel, and then discharges it through the second channel. The actuator piston moves until it reaches a balanced state. At this point, the actuator... The position of the mechanism corresponds exactly to the input signal. The internal feedback spring causes a negative feedback between the first and second amplification stages, changing the spring connection point on the balance bar so that the power of the positioner corresponds to the cylinder size of the actuator. The zero-point adjustment nut of the positioner is adjusted. The first and second air regulating pipes are closed by a shut-off valve. Gas can be connected through the pipes and selectively delivered to the directional groove through the first or second air regulating groove. The position of the slide valve seat can be adjusted as needed to increase the convenience of directional adjustment and effectively adjust as needed.

[0043] 4. This invention interfaces the main control module with the signal conversion module and the execution module respectively, the execution module with the positioner, and the main control module with the signal recognition module. The electric valve positioner is equipped with a control system. The control system converts the electrical signal into a pneumatic signal to drive the regulating valve, issues control commands to the regulating valve, controls the valve's movement, and intelligently adjusts the range. It identifies the correspondence between the electrical signal and the range, finds the available range, and adjusts the stroke to the specified position. This enables the valve positioner to increase the output power of the regulating valve and reduce the occurrence of signal transmission lag. Attached Figure Description

[0044] Figure 1 This is an overall structural diagram of the present invention;

[0045] Figure 2This is a diagram showing the installation position of the internal feedback spring of the present invention;

[0046] Figure 3 This is a cross-sectional view of the actuator structure of the present invention;

[0047] Figure 4 This is a cross-sectional view of the upper connector structure of the present invention;

[0048] Figure 5 This is a cross-sectional exploded view of the upper connector structure of the present invention;

[0049] Figure 6 This is a cross-sectional view of the steering device structure of the present invention;

[0050] Figure 7 This is a block diagram of the control system of the present invention.

[0051] In the diagram: 1. Spring plate assembly; 2. Diaphragm plate; 3. External feedback spring; 4. Cross arm; 5. Cam; 6. Rotating shaft; 7. Rotating sleeve; 8. I-beam hinge; 9. Actuator; 901. Housing; 902. Piston plate; 903. Output rod; 904. Upper connecting pipe; 905. Lower connecting pipe; 906. Upper connecting piece; 9061. Connector; 9062. Inner ring; 9063. Outer ring; 9064. Sealing sleeve; 9065. Inner gasket; 907. Lower connecting piece; 10. Spool valve core; 11. Spool valve seat; 12. Zeroing nut; 13. Internal feedback spring ; 14. Steering device; 141. Steering body; 142. First channel; 143. Second channel; 144. Directional adjustment assembly; 1441. First air regulating groove; 1442. Second air regulating groove; 1443. First air regulating pipe; 1444. Second air regulating pipe; 1445. Sealing valve; 145. Directional groove; 15. Force coil; 151. Housing; 16. Permanent magnet; 17. Balance bar; 18. Nozzle; 19. Leather cup; 20. Control system; 201. Main control module; 202. Signal conversion module; 203. Execution module; 204. Signal recognition module. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] To address the issue that existing feedback springs cannot be positioned as needed, resulting in low overall adaptability, inability to change gain, and poor positioning by the positioner, please refer to [the relevant documentation / reference]. Figures 1-3 This embodiment provides the following technical solution:

[0054] A mechanical electric valve positioner includes a positioner with a spring plate assembly 1 inside. A diaphragm plate 2 is positioned above the spring plate assembly 1, and a cup 19 is wrapped around the upper outer wall of the diaphragm plate 2. The diaphragm plate 2 and the cup 19 are disposed inside a housing. A nozzle 18 is positioned below the diaphragm plate 2, and a balance rod 17 is positioned below the nozzle 18. One end of the diaphragm plate 2 is connected to a spool valve core 10, and a spool valve seat 11 is sleeved below the spool valve core 10. The spool valve seat 11 is disposed inside a steering device 14, one end of which is connected to an actuator 9 via a pipe. One end of the balance rod 17 is respectively wound with an inner feedback spring 13 and an outer feedback spring 3. One end of the inner feedback spring 13 is connected to a zero-adjustment nut 12, and the upper part of the zero-adjustment nut 12 is connected to the spring plate assembly 1. The other end of the balance rod 17 is connected to a force coil 15, which is disposed on both sides of a permanent magnet 16. 5 and permanent magnet 16 are set inside housing 151. Balance bar 17 is mounted on housing 151 via bearing. One end of external feedback spring 3 is connected to cross arm 4. One end of cross arm 4 is equipped with a roller that fits against cam 5. One end of mounting shaft of cam 5 is connected to actuator 9 via I-beam hinge 8. I-beam hinge 8 is equipped with rotating shaft 6 and rotating sleeve 7. A cavity is set inside the housing. The cavity is opened above diaphragm plate 2 and leather cup 19. One side of the cavity is connected to the mounting pipe of nozzle 18 via slot. Force coil 15 is located in the magnetic field of permanent magnet 16. Force coil 15 generates a torque proportional to the current signal of balance bar 17. External feedback spring 3 generates a counter torque proportional to the position of actuator 9. This position is a relative displacement. The cylinder, I-beam hinge 8, feedback shaft and cam 5 transmit the corresponding displacement to the end of external feedback spring 3. Nozzle 18 senses the torque balance on balance bar 17.

[0055] Five internal feedback spring 13 mounting positions are provided on the stabilizer bar 17. Figure 2 The position is divided into five positions: a, b, c, d, and e. The internal feedback spring 13 can be selected according to the needs. The position of the positioner is different depending on the volume of the cylinder chamber of the actuator, so as to change the gain and enable the positioner to be positioned quickly and stably.

[0056] The actuator 9 includes a housing 901, a piston plate 902, an output rod 903, an upper connecting pipe 904, a lower connecting pipe 905, an upper connector 906, and a lower connector 907. An air groove is provided inside the housing 901. The piston plate 902 is fitted inside the housing 901. The output rod 903 is connected to the lower part of the piston plate 902 and is connected to the I-beam hinge 8. The upper connecting pipe 904 is connected to the top of the housing 901, and the lower connecting pipe 905 is connected to the bottom of the housing 901. The upper connector 906 is installed on the upper connecting pipe 904, and the lower connector 907 is installed on the lower connecting pipe 905. The upper connecting pipe 904 is connected to one pipe of the steering device 14 via the upper connector 906, and the lower connecting pipe 905 is connected to another pipe of the steering device 14 via the lower connector 907.

[0057] The upper connector 906 includes a connector 9061, an inner ring 9062, an outer ring 9063, a sealing sleeve 9064, and an inner gasket 9065. The connector 9061 is fixed to the pipe by a bearing. The inner ring 9062 is connected to the upper pipe 904. The outer ring 9063 covers the outer side of the inner ring 9062. The connector 9061 is inserted into the inner ring 9062 and the outer ring 9063. The sealing sleeve 9064 covers the connection between the inner ring 9062 and the outer ring 9063. The inner gasket 9065 is provided on the front end face of the inner ring 9062. External threads are provided on the outer surfaces of both the inner ring 9062 and the connector 9061. Internal threads are provided on the inner walls of both the outer ring 9063 and the connector 9061. The inner wall of connector 9061 is screwed into the thread of connector 9061 via internal threads. During installation, connector 9061 on the pipeline is inserted into outer ring 9063. By rotating connector 9061, inner ring 9062 is screwed into connector 9061. Simultaneously with the installation of inner ring 9062, connector 9061 is screwed into outer ring 9063. The front end of inner ring 9062 and the inner opening end of connector 9061 are sealed by inner gasket 9065. The front end of connector 9061 and the inner end face of outer ring 9063 are sealed by sealing sleeve 9064. The bidirectional thread installation facilitates easy assembly and disassembly and increases the stability of the connection. The bidirectional compression seal improves the sealing performance of the connection and effectively prevents leakage.

[0058] Steering device 14 includes steering body 141, first channel 142, second channel 143, directional adjustment assembly 144, and directional groove 145. The steering body 141 has a directional groove 145, one side of which communicates with the first channel 142 and the second channel 143. The first channel 142 connects to a lower connecting pipe 905 via a pipe, and the second channel 143 connects to an upper connecting pipe 904 via a pipe. The directional adjustment assembly 144 is installed in the directional groove 145. One end of the spool valve core 10 and the spool valve seat 11 are installed in the directional groove 145, and multiple spool valve seats 11 are provided to block multiple outlets in the directional groove 145. When input... When the signal increases, the back pressure near the nozzle 18 of the balance bar 17 increases, which causes the cup 19, spring plate group 1, and spool valve 10 to move upward. The spool valve distributes compressed air to the upper side of the piston of the actuator 9 through the first channel 142, and then discharges it through the second channel 143. The piston of the actuator 9 moves until it reaches a balanced state. At this point, the position of the actuator 9 corresponds exactly to the input signal. The internal feedback spring 13 causes a negative feedback between the first amplification stage and the second amplification stage, changing the spring connection point on the balance bar 17 so that the power of the positioner corresponds to the cylinder size of the actuator 9. The zero-point adjustment nut 12 of the positioner is then adjusted.

[0059] The directional adjustment assembly 144 includes a first air regulating groove 1441, a second air regulating groove 1442, a first air regulating pipe 1443, a second air regulating pipe 1444, and a shut-off valve 1445. The first air regulating groove 1441 is disposed on a steering body 141 between two spool valve seats 11 above the directional groove 145. The second air regulating groove 1442 is disposed on a steering body 141 between two spool valve seats 11 below the directional groove 145. The first air regulating groove 1441 is connected to the rear of the first air regulating pipe 1443. The rear of 442 is connected to the second gas regulating pipe 1444. Both the first gas regulating pipe 1443 and the second gas regulating pipe 1444 are fitted with a shut-off valve 1445. The first gas regulating pipe 1443 and the second gas regulating pipe 1444 are sealed by the shut-off valve 1445. Gas can be introduced through the pipe and selectively transported to the directional trough 145 through the first gas regulating trough 1441 or the second gas regulating trough 1442. The position of the slide valve seat 11 can be adjusted as needed to increase the convenience of directional adjustment and effectively adjust as needed.

[0060] The positioner is also equipped with a control system 20, which includes a main control module 201, a signal conversion module 202, an execution module 203, and a signal recognition module 204. The main control module 201 interfaces with the signal conversion module 202 and the execution module 203, the execution module 203 interfaces with the positioner, and the main control module 201 interfaces with the signal recognition module 204. The electric valve positioner is equipped with the control system 20, which converts electrical signals into pneumatic signals to drive the regulating valve, issues control commands to the regulating valve, controls the valve's movement, and provides intelligent range adjustment. It identifies the correspondence between electrical signals and ranges, finds the available range, and adjusts the stroke to the specified position, enabling the valve positioner to increase the output power of the regulating valve and reduce the occurrence of signal transmission lag.

[0061] To better illustrate the range adjustment process of a mechanical electric valve positioner, this embodiment proposes a range adjustment method for a mechanical electric valve positioner, including the following steps:

[0062] Step 1: The signal conversion module 202 receives the electrical signal and converts it into a pneumatic signal to drive the regulating valve. The main control module 201 then sends control commands to the regulating valve through the pneumatic signal.

[0063] Step 2: Execution module 203 executes the instructions issued by the main control module 201 and controls the action of the regulating valve for intelligent range adjustment;

[0064] Step 3: The signal recognition module 204 identifies the correspondence between the electrical signal and the measurement range, finds the available measurement range, and the main control module 201 adjusts the stroke to the specified position.

[0065] Working principle: When using the positioner, the force coil 15 generates a torque proportional to the current signal of the balance bar 17. The external feedback spring 3 generates a counter torque proportional to the position of the actuator 9. This position, as a relative displacement, is transmitted to the end of the external feedback spring 3 by the cylinder, I-beam hinge 8, feedback shaft, and cam 5. The nozzle 18 senses the torque balance on the balance bar 17. The internal feedback spring 13 can be positioned as needed. The position of the positioner is different depending on the volume of the cylinder chamber of the actuator, thus changing the gain and enabling the positioner to be positioned quickly and stably. The inner wall of the connector 9061 is screwed into the thread of the connector 9061 through the internal thread. During installation, the connector 9061 on the pipeline is inserted into the outer ring 9063. Rotating the connector 9061 causes the inner ring 9062 to be screwed into the connector 9061. While the inner ring 9062 is being installed, the connector 9061 is screwed into the installation. The inner ring 9062 is installed inside the outer ring 9063, and the front end of the inner ring 9062 and the inner port end of the connector 9061 are sealed by the inner gasket 9065. The front end of the connector 9061 and the inner end face of the outer ring 9063 are sealed by the sealing sleeve 9064. When the input signal increases, the back pressure of the balance bar 17 near the nozzle 18 increases, which will cause the cup 19, the spring plate group 1 and the spool valve core 10 to move upward. The spool valve distributes the compressed air to the upper side of the piston of the actuator 9 through the first channel 142, and then discharges it through the second channel 143. The piston of the actuator 9 moves until it reaches the equilibrium state. At this point, the position of the actuator 9 corresponds exactly to the input signal. The inner feedback spring 13 causes a negative feedback between the first amplification stage and the second amplification stage, changing the spring connection point on the balance bar 17 so that the power of the positioner corresponds to the cylinder size of the actuator 9. The zero-point adjusting nut 12 of the positioner is then adjusted.

[0066] In one embodiment of the present invention, the signal conversion module 202 further includes:

[0067] Step 1: Acquire the electrical signal and convert it into a corresponding gas signal;

[0068] Step 2: At the same time as sending the gas signal to the main control module 201, send the electrical signal to the main control module 201 as well.

[0069] Step 3: After the main control module 201 acquires the electrical signal, it extracts whether there is a historical electrical signal with the same value as the electrical signal in the historical record of electrical signal reception; if there is no historical electrical signal with the same value as the electrical signal, then the fourth step is executed; if there is a historical electrical signal with the same value as the electrical signal, then the fifth step is executed.

[0070] Step 4: The control command corresponding to the gas signal issued by the main control module 201 is sent to the execution module 203;

[0071] Step 5: Retrieve the gas signal value corresponding to the historical electrical signal, compare the gas signal value corresponding to the historical electrical signal with the gas signal value corresponding to the current electrical signal, and determine whether one or more differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceed a preset first difference threshold.

[0072] Step 6: If the difference between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal does not exceed the preset first difference threshold, then proceed to step 4; if any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds the preset first difference threshold, then proceed to step 7.

[0073] Step 7: Based on the gas signal corresponding to the historical electrical signal and the gas signal corresponding to the current electrical signal, obtain the gas signal value corresponding to the electrical signal, use the gas signal value as the target gas signal, and send it to the execution module 203 according to the control command corresponding to the target gas signal; wherein, the target gas signal is obtained by the following formula:

[0074]

[0075] Among them, Q z Q represents the value corresponding to the target gas signal; Q1 represents the gas signal value corresponding to the first electrical signal that appears in the historical electrical signals; n represents the number of electrical signals in the historical electrical signals; Q 01 Q represents the value corresponding to the first difference threshold; i Q represents the gas signal value corresponding to the i-th electrical signal in the historical electrical signals; d Q represents the gas signal value corresponding to the current electrical signal; e This indicates the preset allowable error value.

[0076] Step 8: When the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module 202 exceeds the preset second difference threshold, an alarm is triggered.

[0077] The technical effects of the above solution are as follows: As the usage time of circuit equipment increases, the aging of internal components leads to increased signal conversion errors. The above method utilizes historical electrical signals to verify and detect the accuracy of the gas signal generated from the current electrical signal, reducing the likelihood of inaccurate gas signal conversion due to large errors, which in turn leads to inaccurate positioning control. Simultaneously, the comprehensive target gas signal obtained through the above formula can provide a gas signal that is closer to the true gas signal value than the current signal, even with larger errors but within the preset error allowable range. This improves the accuracy of gas signal conversion as the equipment hardware gradually ages.

[0078] In one embodiment of the present invention, when the difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module 202 exceeds a preset second difference threshold, an alarm is triggered, including:

[0079] The difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module 202 is compared to obtain the difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module 202.

[0080] The second difference threshold is obtained by using one or more difference values ​​between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal, and the relationship between these differences and the first difference threshold.

[0081]

[0082] Among them, Q 02 The second difference threshold is represented by m, which represents the number of times in the historical electrical signals that any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds the preset first difference threshold.

[0083] The difference value is compared with a preset second difference threshold, and an alarm is triggered when the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module 202 exceeds the preset second difference threshold.

[0084] The technical effects of the above solution are as follows: This method effectively improves the detection intensity of gas signal conversion and the matching between the second difference threshold setting and the actual operation of the signal conversion module 202. Simultaneously, by setting the second difference threshold, specific second difference thresholds can be set for different specific values ​​of electrical signals, effectively improving the uniqueness and monitoring accuracy of electrical signal to gas signal conversion detection. Since the conversion error between different electrical signals and gas signals does not change uniformly, setting a uniform second difference threshold would lead to inaccurate monitoring of the error in converting different electrical signal values ​​to gas signals. Therefore, setting specific and unique second difference thresholds for different electrical signals can effectively improve the monitoring accuracy and precision of the conversion rate of electrical signals of all values.

[0085] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0086] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting the range of a mechanical electric valve positioner, comprising a positioner, characterized in that: The locator is provided with a spring plate assembly (1), and a diaphragm plate (2) is provided above the spring plate assembly (1). A leather cup (19) is wrapped around the upper outer wall of the diaphragm plate (2). The diaphragm plate (2) and the leather cup (19) are located inside the outer shell. A nozzle (18) is provided below the diaphragm plate (2), and a balance bar (17) is provided below the nozzle (18). One end of the diaphragm plate (2) is connected to the spool valve core (10), and the spool valve core (10) is sleeved below the spool valve seat (11). The spool valve seat (11) is set inside the steering device (14), and one end of the steering device (14) is connected to the actuator (9) through a pipe. One end of the balance bar (17) is respectively wound with an inner feedback spring (13) and an outer feedback spring (3). One end of the inner feedback spring (13) is connected to the zero-adjustment nut (12), and the top of the zero-adjustment nut (12) is connected to the spring plate group (1). The other end of the balance bar (17) is connected to the force coil (15). The force coil (15) is set on both sides of the permanent magnet (16). The force coil (15) and the permanent magnet (16) are set inside the housing (151). The balance bar (17) is mounted on the housing (151) through a bearing. One end of the external feedback spring (3) is connected to the cross arm (4). One end of the cross arm (4) is equipped with a roller that fits against the cam (5). One end of the mounting shaft of the cam (5) is connected to the actuator (9) through the I-beam hinge (8). The I-beam hinge (8) is provided with a rotating shaft (6) and a rotating sleeve (7). A cavity is provided inside the outer shell. The cavity is opened above the diaphragm plate (2) and the leather cup (19). One side of the cavity is connected to the mounting pipe of the nozzle (18) through a slot. The locator is also equipped with a control system (20), which includes a main control module (201), a signal conversion module (202), an execution module (203), and a signal recognition module (204). The main control module (201) is connected to the signal conversion module (202) and the execution module (203) respectively. The execution module (203) is connected to the locator. The main control module (201) is connected to the signal recognition module (204). The method for adjusting the range of a mechanical electric valve positioner includes the following steps: Step 1: The signal conversion module (202) receives the electrical signal and converts it into a pneumatic signal to drive the regulating valve. The main control module (201) sends control commands to the regulating valve through the pneumatic signal. Step 2: The execution module (203) executes the instructions issued by the main control module (201) and controls the action of the regulating valve, enabling intelligent range adjustment; Step 3: The signal recognition module (204) identifies the correspondence between the electrical signal and the range, finds the available range, and the main control module (201) adjusts the stroke to the specified position; The signal conversion module (202) further includes: Step 1: Acquire the electrical signal and convert it into a corresponding gas signal; Step 2: At the same time as sending the gas signal to the main control module (201), the electrical signal is also sent to the main control module (201). Step 3: After the main control module (201) acquires the electrical signal, it extracts whether there is a historical electrical signal with the same value as the electrical signal in the historical record of electrical signal reception; if there is no historical electrical signal with the same value as the electrical signal, then the fourth step is performed; if there is a historical electrical signal with the same value as the electrical signal, then the fifth step is performed. Step 4: The control command corresponding to the gas signal issued by the main control module (201) is sent to the execution module (203). Step 5: Retrieve the gas signal value corresponding to the historical electrical signal, compare the gas signal value corresponding to the historical electrical signal with the gas signal value corresponding to the current electrical signal, and determine whether one or more differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceed a preset first difference threshold. Step 6: If the difference between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal does not exceed the preset first difference threshold, then proceed to step 4; if any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds the preset first difference threshold, then proceed to step 7. Step 7: Based on the gas signal corresponding to the historical electrical signal and the gas signal corresponding to the current electrical signal, obtain the gas signal value corresponding to the electrical signal, use the gas signal value as the target gas signal, and send it to the execution module (203) according to the control command corresponding to the target gas signal; wherein, the target gas signal is obtained by the following formula: in, This represents the numerical value corresponding to the target gas signal; This indicates the gas signal value corresponding to the first electrical signal that appears in the historical electrical signals; Indicates the number of electrical signals in the historical electrical signals; This represents the numerical value corresponding to the first difference threshold; Indicates the first in the historical electrical signal The gas signal value corresponding to each electrical signal; This indicates the gas signal value corresponding to the current electrical signal; This indicates the preset allowable error value; Step 8: When the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module (202) exceeds the preset second difference threshold, an alarm is triggered. When the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module (202) exceeds a preset second difference threshold, an alarm is triggered, including: The difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module (202) is compared to obtain the difference between the target gas signal and the gas signal converted from the electrical signal input to the current signal conversion module (202). The second difference threshold is obtained by using one or more difference values ​​between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal, and the relationship between these values ​​and the first difference threshold. in, Indicates the second difference threshold; This indicates the number of times in the historical electrical signals that any one of the differences between the gas signal value corresponding to the historical electrical signal and the gas signal value corresponding to the current electrical signal exceeds a preset first difference threshold. The difference value is compared with a preset second difference threshold, and an alarm is triggered when the difference between the target gas signal and the gas signal converted from the electrical signal input by the current signal conversion module (202) exceeds the preset second difference threshold.

2. The range adjustment method for a mechanical electric valve positioner according to claim 1, characterized in that: The actuator (9) includes a housing (901), a piston plate (902), an output rod (903), an upper connecting pipe (904), a lower connecting pipe (905), an upper connector (906), and a lower connector (907). An air groove is provided inside the housing (901). The piston plate (902) is fitted inside the housing (901). The output rod (903) is connected below the piston plate (902) and is connected to an I-beam hinge (8). An upper connecting pipe (904) is connected above the outer casing (901), and a lower connecting pipe (905) is connected below the outer casing (901). An upper connecting piece (906) is installed on the upper connecting pipe (904), and a lower connecting piece (907) is installed on the lower connecting pipe (905). The upper connecting pipe (904) is connected to one pipe of the steering device (14) through the upper connecting piece (906), and the lower connecting pipe (905) is connected to another pipe of the steering device (14) through the lower connecting piece (907).

3. The range adjustment method for a mechanical electric valve positioner according to claim 2, characterized in that: The upper connector (906) includes a connector (9061), an inner ring (9062), an outer ring (9063), a sealing sleeve (9064), and an inner gasket (9065). The connector (9061) is fixed to the pipe by a bearing. The inner ring (9062) is connected to the upper pipe (904). The outer ring (9063) covers the outer side of the inner ring (9062). The connector (9061) is inserted into the inner ring (9062) and the outer ring (9063). The connection between the inner ring (9062) and the outer ring (9063) is covered by a sealing sleeve (9064). An inner gasket (9065) is provided on the front end face of the inner ring (9062).

4. The range adjustment method for a mechanical electric valve positioner according to claim 3, characterized in that: The outer surfaces of the inner ring (9062) and the connector (9061) are provided with external threads, and the inner walls of the outer ring (9063) and the connector (9061) are provided with internal threads. The inner wall of the connector (9061) is screwed into the thread of the connector (9061) through the internal thread.

5. The range adjustment method for a mechanical electric valve positioner according to claim 4, characterized in that: The steering device (14) includes a steering body (141), a first channel (142), a second channel (143), a directional adjustment component (144), and a directional groove (145). The steering body (141) has a directional groove (145) inside. One side of the directional groove (145) is connected to the first channel (142) and the second channel (143) respectively. The first channel (142) is connected to the lower connecting pipe (905) through a pipe, and the second channel (143) is connected to the upper connecting pipe (904) through a pipe. The directional adjustment component (144) is provided in the directional groove (145). One end of the spool valve core (10) and the spool valve seat (11) are provided in the directional groove (145), and multiple spool valve seats (11) are provided to block multiple outlets in the directional groove (145).

6. The range adjustment method for a mechanical electric valve positioner according to claim 5, characterized in that: The directional adjustment assembly (144) includes a first air regulating groove (1441), a second air regulating groove (1442), a first air regulating pipe (1443), a second air regulating pipe (1444), and a shut-off valve (1445). The first air regulating groove (1441) is located on a steering body (141) between two spool valve seats (11) above the directional groove (145). The second air regulating groove (1442) is located on a steering body (141) between two spool valve seats (11) below the directional groove (145). The first air regulating groove (1441) is connected to the rear of the first air regulating pipe (1443), and the second air regulating groove (1442) is connected to the rear of the second air regulating pipe (1444). A shut-off valve (1445) is fitted onto both the first air regulating pipe (1443) and the second air regulating pipe (1444).

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