Self-sensing thermal balance regulated high temperature flat valve

Abstract

This invention relates to the field of flat plate valve technology and discloses a high-temperature flat plate valve with self-sensing thermal balance control. The valve includes a valve body, a valve cover, a valve seat disposed within the valve body, a gate that moves up and down within the valve body to open and close the flow channel, and a valve stem connected to the gate. It also includes a self-sensing thermal balance control system, comprising: a multi-parameter sensing unit including multiple sensors for acquiring the temperature, opening and closing torque, and medium pressure at various positions of the flat plate valve; a control unit configured to generate a thermal imbalance state criterion based on the detection data from the multiple sensors and output control commands; and a valve stem position adjustment unit disposed at the valve stem protrusion channel of the valve cover and cooperating with the valve stem, configured to automatically correct the position of the valve stem upon triggering the control command. This invention monitors the valve status in real time and actively adjusts the geometric center of the valve stem, ensuring the reliability of the valve's operation under temperature fluctuations and avoiding equipment failure due to thermal jamming.

Description

Technical Field

[0001] This invention relates to the field of flat plate valve technology, and more specifically, to a high-temperature flat plate valve with self-sensing thermal balance regulation. Background Technology

[0002] High-temperature flat valves are widely used in industrial processes such as petroleum, chemical, power, and metallurgy, primarily for controlling the flow of high-temperature fluid media. Under high-temperature conditions (typically above 350℃, and even exceeding 600℃), valve components face severe thermal shock challenges. Because the valve body, cover, gate, and stem are usually made of different materials, or even the same material in different temperature gradient fields, the thermal expansion of each component is often inconsistent. This non-uniform thermal expansion can easily lead to the disappearance of the gap between the valve stem and the guide portion of the cover, generating enormous thermal stress. This can cause the valve stem to bend and deform, accelerate wear on the sealing surface, and in severe cases, even lead to "thermal jamming," preventing the valve from opening and closing properly and causing serious safety accidents.

[0003] Currently, to address the thermal expansion issue of high-temperature valves, existing technologies primarily employ passive protection methods, such as increasing the fitting clearance, selecting materials with low expansion coefficients, or adding external forced cooling systems. This passive thermal management approach cannot detect the actual thermal deformation state inside the valve. Cooling water chambers can only lower the external shell temperature; for the gate and lower end of the valve stem, which are located in the center of the flow channel and directly contact the high-temperature medium, the cooling effect is delayed and uneven. The valve stem may still bend due to excessive internal and external temperature differences. Moreover, once microscopic thermal distortion of the valve body or bending of the valve stem occurs, simple cooling methods cannot eliminate the resulting mechanical interference.

[0004] Therefore, it is necessary to propose a high-temperature flat plate valve with self-sensing thermal balance regulation to at least partially solve the problems existing in the prior art. Summary of the Invention

[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0006] To at least partially solve the above problems, the present invention provides a high-temperature flat plate valve with self-sensing thermal balance regulation, comprising: a valve body, a valve cover, a valve seat disposed within the valve body, a gate that moves up and down within the valve body to open and close a flow channel, and a valve stem connected to the gate; and further comprising a self-sensing thermal balance regulation system, the self-sensing thermal balance regulation system comprising: The multi-parameter sensing unit includes multiple sensors for acquiring temperature, opening and closing torque, and medium pressure at various positions of the flat panel valve; The control unit, electrically connected to the multi-parameter sensing unit, is configured to generate thermal imbalance state criteria based on the detection data from multiple sensors and output control commands. The valve stem position adjustment unit is located at the valve stem protrusion channel of the valve cover and cooperates with the valve stem. It is configured to automatically correct the position of the valve stem when triggered by a control command.

[0007] Preferably, the valve stem position adjustment unit includes: A guide cavity is formed on the top of the valve cover and surrounds the valve stem; A floating guide sleeve is assembled in the guide cavity and forms a guiding fit with the valve stem. There is a gap between the floating guide sleeve and the guide cavity to allow the floating guide sleeve to move laterally relative to the guide cavity. At least three push actuator assemblies are arranged at intervals along the circumference of the guide cavity and perform differential radial push towards the floating guide sleeve, so that the floating guide sleeve generates lateral displacement and / or micro-tilt adjustment relative to the guide cavity. The push actuator assemblies are electrically connected to the control unit.

[0008] Preferably, the floating guide sleeve includes an outer sleeve and an inner guide layer disposed in the inner hole of the outer sleeve. The inner guide layer is made of a high-temperature resistant and low-friction material. The outer circle of the outer sleeve is provided with a force-bearing plane that corresponds one-to-one with the push actuator assembly. The push tip of the push actuator assembly presses against the corresponding force-bearing plane. A reset elastic ring is provided between the outer sleeve and the guide cavity to apply an elastic restoring force to the outer sleeve to reset it to the center position.

[0009] Preferably, the valve stem position adjustment unit further includes a spherical support seat, which includes a central concave seat ring and a convex bearing ring connected to the floating guide sleeve. The concave seat ring and the convex bearing ring are in spherical sliding contact fit, allowing the convex bearing ring to slide and rotate relative to each other within the concave seat ring.

[0010] Preferably, the push actuator assembly includes: The actuator housing is connected to the radial mounting port of the valve cover, and an internal heat insulation layer is provided. The push pin is radially slidably disposed in the actuator housing, with its inner end extending into the guide cavity and connected to a wear-resistant ball head, which presses against the floating guide sleeve. The pneumatic cylinder is installed inside the actuator housing and connected to the push pin. The pneumatic cylinder is electrically connected to the control unit. When the pneumatic cylinder does not receive a control command, it is in a free-moving state and passively extends and retracts with the displacement of the push pin. When the control unit determines that the valve stem position needs to be adjusted, it takes the extension and retraction state of the pneumatic cylinder at that moment as the control zero point, and controls the pneumatic cylinder to generate relative extension and retraction to drive the push pin to apply adjustment thrust to the floating guide sleeve.

[0011] Preferably, the push actuator assembly further includes: The pre-tightening plate is slidably disposed within the actuator housing; A preload spring is installed between the preload pressure plate and the outer end of the push pin to apply a radially inward preload force to the push pin. The adjusting screw is connected to the outer end of the actuator housing, and its end abuts against the preload plate. It is used to set the initial preload of the push pin.

[0012] Preferably, the control unit is equipped with a multi-field coupling hysteresis compensation model, and the control logic of the multi-field coupling hysteresis compensation model includes: The material properties, geometric parameters, and thermal conduction boundary conditions of the valve body and valve stem are called up to solve for the time constant dominated by thermal inertia. Based on the time constant, establish the differential thermal expansion time constant matrix; Based on the differential thermal expansion time constant matrix, medium temperature dynamic data, and thermal boundary conditions, the thermal response lag time of the valve body cavity structure relative to the medium temperature change is calculated by comparing the time delay between the valve body cavity temperature response curve and the medium temperature change curve, under the condition that the medium temperature undergoes a step change and the convective heat transfer coefficient remains constant. Based on the thermal response hysteresis time, the pre-stored thermo-structural parameters of the valve seat, and the prediction time window, the transient thermo-structural sequential coupling algorithm is used to predict the instantaneous deformation of the valve seat sealing surface at future moments. Based on the instantaneous deformation and real-time sensor data, a dynamic tolerance zone is generated on the time axis. The real-time sensor data includes: valve stem eccentric displacement vector, opening and closing torque fluctuation value, and current pressure of each pneumatic cylinder. The generation logic of the dynamic tolerance zone is: the instantaneous deformation is used as the center line of the tolerance zone, and the bandwidth is determined by the opening and closing torque fluctuation value and the preset safety factor. Based on the dynamic tolerance zone, a corresponding pressure control command is generated to control the pneumatic cylinder to drive the push pin to apply nonlinear gradual prestress to the floating guide sleeve.

[0013] Preferably, based on the dynamic tolerance zone, a corresponding pressure control command is generated to control the pneumatic cylinder to drive the push pin to apply nonlinear gradual prestress to the floating guide sleeve, including: The dynamic tolerance zone is mapped to the target trajectory of the valve stem center in the time domain; the mapping relationship is: the center line of the tolerance zone is used as the target position curve. Establish a two-dimensional correction plane coordinate system with the valve stem axis as the origin, and calculate the correction vector based on the deviation between the target trajectory and the current actual position; A set of torque coupling equations is constructed based on the geometric distribution angles of at least three pusher actuator components on the circumference. The correction vector and the required correction torque are decoupled and calculated into the target pressure control value for each pneumatic cylinder; Based on the PID closed-loop control algorithm, the intake and exhaust volumes of each pneumatic cylinder are dynamically adjusted according to the target pressure control value until the opening and closing torque fluctuation value detected by the multi-parameter sensing unit drops to within the preset stable operation threshold range.

[0014] Preferably, the control unit is configured to execute a friction torque spectrum feature separation algorithm for accurate identification of jamming types, including: The opening and closing torque data are sampled at high frequency and a fast Fourier transform is performed to convert the time-domain torque signal into a frequency-domain energy spectrum. Extract the eigenvalues ​​of the low-frequency and high-frequency components from the frequency domain energy spectrum; When the amplitude of the low-frequency component increases monotonically with increasing temperature and the rate of increase is lower than the preset rate of increase threshold, and the energy value of the high-frequency component is lower than the preset energy threshold, the jamming type is determined to be viscous thermal jamming, and the output command increases the driving thrust of the valve stem. When the high-frequency component exhibits an irregular broadband energy surge, accompanied by stick-slip step characteristics of the position signal, the jamming type is determined to be metal adhesion or foreign object embedding. The valve stem lifting drive is stopped, and the push actuator assembly is controlled to perform a high-frequency micro-amplitude reciprocating jitter action, using alternating inertial force to attempt to loosen the adhesion point.

[0015] Preferably, the self-sensing thermal balance control system also possesses a self-healing function based on zero-point drift reconstruction, including: The control unit establishes a global coordinate system with the cold assembly center as the origin and a local floating coordinate system with the actual geometric center of the current floating guide sleeve as the origin in the memory; After each high-temperature operation cycle ends, the medium pressure returns to zero, and the temperature drops to ambient temperature, the control unit records the static position of the valve stem under no driving force and medium load, and calculates the residual plastic deformation vector of the static position relative to the global coordinate system. When the modulus of the residual plastic deformation vector exceeds the threshold set based on the yield strength of the valve stem material and historical deformation data, the control unit automatically performs coordinate system reconstruction, shifting the origin of the local floating coordinate system to the endpoint coordinate position of the residual plastic deformation vector, and using the endpoint coordinate position as the control reference for the next adjustment. This allows the adjustment action of the push actuator assembly to automatically adapt to the permanent thermal bending of the valve stem, preventing secondary internal stress damage caused by forced correction to the cold assembly center.

[0016] Compared to existing technologies, this invention provides a high-temperature flat valve with self-sensing thermal balance regulation, which includes at least the following beneficial effects: A multi-parameter sensing unit monitors the valve status in real time; the regulation unit comprehensively considers temperature, torque, and pressure conditions, outputting a command when triggering conditions are met; and a valve stem position adjustment unit makes minor corrections to the valve stem guide center, adjusting the force distribution during gate lifting and lowering. When high temperatures cause microscopic distortion of the valve body or thermal expansion of the valve stem, the system can actively adjust the geometric center of the valve stem, thereby eliminating rigid interference caused by thermal stress accumulation, ensuring the valve's operational reliability under extreme temperature fluctuations, avoiding equipment failure due to thermal jamming, and significantly improving the safety performance of high-temperature valves.

[0017] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a high-temperature flat plate valve with self-sensing thermal balance regulation according to the present invention. Figure 2 This is a schematic cross-sectional view of a high-temperature flat plate valve with self-sensing thermal balance regulation according to the present invention. Figure 3 This is a cross-sectional structural diagram of the valve stem position adjustment unit in this invention; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the partial structure at point A in the middle; Figure 5 This is a cross-sectional structural diagram of the push actuator assembly in this invention.

[0019] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Gate; 5. Valve stem; 11. Guide cavity; 12. Floating guide sleeve; 121. Outer sleeve; 122. Inner guide liner; 13. Push actuator assembly; 131. Actuator housing; 132. Push pin; 133. Wear-resistant ball head; 134. Pneumatic cylinder; 135. Preload plate; 136. Preload spring; 137. Adjusting screw; 14. Spherical support seat; 141. Concave seat ring; 142. Convex bearing ring; 15. Return elastic ring. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0021] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0022] Example 1: As Figures 1-5 As shown, the present invention provides a high-temperature flat plate valve with self-sensing thermal balance regulation, including a valve body 1, a valve cover 2, a valve seat 3 disposed within the valve body 1, a gate 4 that moves up and down within the valve body 1 to open and close the flow channel, and a valve stem 5 connected to the gate 4. It also includes a self-sensing thermal balance regulation system, which includes: The multi-parameter sensing unit includes multiple sensors for acquiring temperature, opening and closing torque, and medium pressure at various positions of the flat panel valve; The control unit, electrically connected to the multi-parameter sensing unit, is configured to generate thermal imbalance state criteria based on the detection data from multiple sensors and output control commands. The valve stem position adjustment unit is located at the valve stem protrusion channel of the valve cover 2 and cooperates with the valve stem 5. It is configured to automatically correct the position of the valve stem 5 when triggered by a control command.

[0023] The working principle and beneficial effects of the above technical solution are as follows: The high-temperature flat valve of this embodiment includes a valve body 1, a valve cover 2, a valve seat 3 disposed within the valve body 1, a gate 4 that moves up and down within the valve body 1 to open and close the flow channel, and a valve stem 5 connected to the gate 4. The valve stem 5 passes through the valve stem outlet channel of the valve cover 2 and engages with the guide area at the valve cover 2. The axial force applied by the external actuator is transmitted to the gate 4 via the valve stem 5, causing the gate 4 to move up and down within the valve body 1 to open and close the flow channel. The gate 4 and the valve seat 3 form a sealing fit.

[0024] The valve also includes a self-sensing thermal balance control system. This system comprises a multi-parameter sensing unit, a control unit, and a valve stem position adjustment unit. The multi-parameter sensing unit includes multiple sensors for acquiring the temperature, opening / closing torque, and medium pressure at various positions of the flat valve. Temperature sensors can be positioned in the area of ​​the valve cover 2 near the valve stem outlet, the area adjacent to the valve seat 3, and the outer wall or flow channel of the valve body 1 to output temperature signals reflecting the thermal state of different parts. Torque sensors are located in the valve stem 5 drive link to output torque signals corresponding to the opening / closing resistance. Pressure sensors are located in the flow channel or pressure tap of the valve body 1 to output medium pressure signals.

[0025] After receiving the above signal, the control unit outputs a control command according to the preset trigger conditions. In this embodiment, the trigger conditions are used to characterize the valve being in a state where the guide center of the valve stem 5 needs to be corrected, and the specific calculation method is not limited. The valve stem position adjustment unit is arranged at the valve stem exit channel of the valve cover 2 and cooperates with the valve stem 5. When the control command is received, the valve stem position adjustment unit generates a structural displacement. This structural displacement acts on the support center of the guide section of the valve stem 5 in the form of thrust, causing the guide center of the valve stem 5 at the valve cover 2 to shift and / or the posture to change slightly. Under the action of the thrust, the valve stem 5 makes a slight radial position adjustment within the channel of the valve cover 2 until the mechanical interference is released, ensuring that the valve stem 5 can move up and down smoothly.

[0026] A cooling circuit can be installed on the valve, and the control unit can output a control signal to the cooling circuit to coordinate with the position correction action of the valve stem 5.

[0027] This embodiment employs a multi-parameter sensing unit to monitor the valve status in real time. The control unit comprehensively considers temperature, torque, and pressure conditions, and outputs a command when triggering conditions are met. The valve stem position adjustment unit makes a slight correction to the guide center of the valve stem 5, thereby adjusting the force distribution during the raising and lowering of the gate 4. When high temperature causes microscopic distortion of the valve body or thermal expansion of the valve stem 5, the system can actively adjust the geometric center of the valve stem 5, thereby eliminating rigid interference caused by thermal stress accumulation. This ensures the reliability of the valve's operation under extreme temperature fluctuations, avoids equipment failure due to thermal jamming, and significantly improves the safety performance of high-temperature valves.

[0028] In addition, the valve stem position adjustment unit is set at the valve stem protrusion channel of the valve cover 2, so that the correction action is concentrated in the upper space of the valve. There is no need to arrange a large actuator or long transmission chain on the medium side of the valve body 1. During maintenance, the disassembly and reassembly of the valve cover 2 is the main focus, which is convenient for on-site operation and the scope of disassembly and inspection during shutdown is controllable.

[0029] Example 2: Based on Example 1 above, the valve stem position adjustment unit includes: A guide cavity 11 is formed on the top of the valve cover 2 and surrounds the valve stem 5; The floating guide sleeve 12 is assembled in the guide cavity 11 and forms a guiding fit with the valve stem 5. There is a gap between the floating guide sleeve 12 and the guide cavity 11 to allow the floating guide sleeve 12 to move laterally relative to the guide cavity 11. At least three push actuator assemblies 13 are arranged circumferentially along the guide cavity 11 and perform differential radial push towards the floating guide sleeve 12, so that the floating guide sleeve 12 generates lateral displacement and / or micro-tilt adjustment relative to the guide cavity 11. The push actuator assemblies 13 are electrically connected to the control unit.

[0030] The floating guide sleeve 12 includes an outer sleeve 121 and an inner guide layer 122 disposed in the inner hole of the outer sleeve 121. The inner guide layer 122 is made of a high-temperature resistant and low-friction material. The outer circle of the outer sleeve 121 is provided with force-bearing planes that correspond one-to-one with the push actuator assembly 13. The push tip of the push actuator assembly 13 presses against the corresponding force-bearing plane. A reset elastic ring 15 is provided between the outer sleeve 121 and the guide cavity 11 to apply an elastic restoring force to the outer sleeve 121 to reset it to the center position.

[0031] The valve stem position adjustment unit also includes a spherical support seat 14, which includes a central concave seat ring 141 and a convex bearing ring 142 connected to the floating guide sleeve 12. The concave seat ring 141 and the convex bearing ring 142 are in spherical sliding contact fit, allowing the convex bearing ring 142 to slide and rotate relative to each other within the concave seat ring 141.

[0032] The working principle and beneficial effects of the above technical solution are as follows: Under high temperature and pressure, the valve stem 5 not only undergoes radial expansion, but valve stems with a large length-to-diameter ratio are also prone to bow-shaped bending deformation. The bent valve stem 5 will generate extremely large edge contact stress at the edge of the guide sleeve inner hole, leading to rapid wear of the sealing surface. Therefore, a valve stem position adjustment unit is set up.

[0033] The valve stem position adjustment unit includes a guide cavity 11, a floating guide sleeve 12, and at least three push actuator assemblies 13. A radial structural gap is provided between the floating guide sleeve 12 and the guide cavity 11 to provide lateral displacement space for the floating guide sleeve 12, so that the floating guide sleeve 12 does not cause hard interference with the inner wall of the guide cavity 11 even at the maximum lateral displacement.

[0034] The push actuator assemblies 13 are arranged circumferentially along the guide cavity 11 and push radially toward the floating guide sleeve 12. After the control unit outputs a command, each push actuator assembly 13 generates a push displacement. The three sets of push actuator assemblies are arranged in different orientations. When the push displacement is differentially distributed according to orientation, the lateral component of the combined thrust of the three points pushes the floating guide sleeve 12 to shift within the guide cavity 11, thereby driving the valve stem 5 to move and eliminating lateral load. When the push differential distribution is asymmetrical, the floating guide sleeve 12 generates a slight tilt adjustment while moving laterally, and the floating guide sleeve 12 adaptively tilts according to the bending angle of the valve stem 5. That is, after the position of the floating guide sleeve 12 changes, the support center of the valve stem 5 in the valve cover guide section moves accordingly, the lateral constraint direction of the valve stem 5 on the gate 4 changes, and the lateral load state of the gate 4 during the lifting and lowering process is adjusted accordingly.

[0035] The inner guide layer 122 at the center of the floating guide sleeve 12 is made of a high-temperature resistant and low-friction material, forming a sliding guide pair with the valve stem 5, so that the valve stem maintains continuous guidance when the floating guide sleeve 12 moves laterally or tilts slightly. A reset elastic ring 15 is provided between the outer sleeve 121 and the guide cavity 11. When the command is canceled or the pushing amount is reduced, the reset elastic ring 15 pushes the outer sleeve 121 back to the center position, and the floating guide sleeve 12 returns to the center.

[0036] The valve stem position adjustment unit also includes a spherical support seat 14. The spherical support seat 14 is configured as a support follower structure, with a spherical sliding contact fit between the concave seat ring 141 and the convex support ring 142. The size of the concave seat ring 141 is larger than the size of the convex support ring 142, allowing the convex support ring 142 to rotate relative to the concave seat ring 141 while also sliding relative to it, in order to accommodate the eccentric displacement of the floating guide sleeve 12 in the guide cavity 11.

[0037] This embodiment constructs a flexible guiding system through a coupling design of gap floating and spherical oscillation. First, the floating guide sleeve 12, in conjunction with a differential pushing mechanism, achieves dynamic centering of the valve stem 5 axis, avoiding unilateral hard friction caused by uneven thermal expansion in traditional structures. Second, the introduction of a spherical support structure solves the problem that the bent valve stem 5 cannot adapt to the rigid valve stem channel. The inner guide layer 122 is always in contact with the valve stem 5, maintaining continuous guidance of the valve stem 5 and preventing guidance interruption during the correction process. Through the offset and micro-tilt adjustment of the guide center, the valve stem 5 is prevented from wearing and maintains good surface finish after long-term high-temperature cyclic operation, reducing the off-center load and torsion during the lifting and lowering of the gate 4, ensuring a sealing fit between the gate 4 and the valve seat 3, effectively extending the service life of the sealing assembly, and thus reducing the risk of leakage.

[0038] Example 3: Based on Example 2 above, the push actuator assembly 13 includes: The actuator housing 131 is connected to the radial mounting port of the valve cover 2, and a heat insulation layer is provided inside it; The push pin 132 is radially slidably disposed in the actuator housing 131, with its inner end extending into the guide cavity 11 and connected to a wear-resistant ball head 133, which presses against the floating guide sleeve 12. A pneumatic cylinder 134 is installed inside the actuator housing 131 and connected to the push pin 132. The pneumatic cylinder 134 is electrically connected to the control unit. Among them, the pneumatic cylinder 134 is in a free-moving state when it does not receive a control command, and passively extends and retracts with the displacement of the push pin 132; the actuator housing 131 is hinged at both ends so that it can deflect.

[0039] When the control unit determines that the position of valve stem 5 needs to be adjusted, the extension and retraction state of pneumatic cylinder 134 at that moment is taken as the control zero point, and on this basis, the pneumatic cylinder 134 is controlled to generate relative extension and retraction to drive the push pin 132 to apply adjustment thrust to the floating guide sleeve 12. The pre-tightening plate 135 is slidably disposed within the actuator housing 131; A preload spring 136 is installed between the preload pressure plate 135 and the outer end of the push pin 132, and is used to apply a radially inward preload force to the push pin 132; Adjusting screw 137 is connected to the outer end of actuator housing 131, and its end abuts against preload plate 135, used to set the initial preload of push pin 132.

[0040] The working principle and beneficial effects of the above technical solution are as follows: In this embodiment, the push actuator assembly 13 is used to adaptively adjust the radial position of the valve stem 5 under high temperature conditions. Its structure and operation take into account the requirements of free floating of the valve stem, thermal deformation adaptation and centering correction.

[0041] A heat insulation layer is provided inside the actuator housing 131 to provide thermal protection for its internal structure.

[0042] In the preload adjustment and initial support states, the position of the preload pressure plate 135 within the actuator housing 131 can be changed by rotating the adjusting screw 137, thereby adjusting the compression of the preload spring 136 and allowing the push pin 132 to obtain a set radial inward preload force. This preload force is used to ensure that the wear-resistant ball head 133 remains stably engaged with the floating guide sleeve 12 during the initial operation of the valve and when the valve stem is not adjusted, thus providing continuous and flexible radial support to the floating guide sleeve 12 without applying an active driving force. The preload adjustment structure can be set according to the valve specifications, operating temperature, and vibration conditions to avoid the push pin from disengaging or impacting due to assembly gaps or thermal vibration, while also preventing excessive preload force from generating unnecessary additional load on the valve stem 5.

[0043] When the control unit does not issue a valve stem adjustment command, the pneumatic cylinder 134 is in a free-moving state and does not apply an active thrust to the push pin 132. At this time, under the elastic action of the preload spring 136, the push pin 132 can passively extend and retract with the radial displacement of the floating guide sleeve 12.

[0044] When the valve body, valve cover, or valve stem 5 undergoes thermal expansion or structural micro-deformation due to high-temperature conditions, the floating guide sleeve 12 can generate a small adaptive displacement under the elastic support of multiple push actuator assemblies 13. The pneumatic cylinder 134 only acts as a displacement transmission component and does not participate in rigid constraint, thereby avoiding continuous rigid push on the valve stem 5 under high-temperature conditions and reducing the long-term stress risk of the actuator and push structure.

[0045] When the control unit determines that the valve stem 5 has a tendency to deviate or its alignment is deteriorated based on the data collected by the multi-parameter sensing unit, it initiates the valve stem adjustment process. At the instant the adjustment command is triggered, the push pins 132 in each push actuator assembly 13 are already in a force and displacement state corresponding to the actual working condition with the floating guide sleeve 12 under the action of the preload spring 136. Due to the existence of assembly tolerances, preload differences, and thermal deformation, the pneumatic cylinders 134 in different push actuator assemblies 13 have undergone different degrees of extension and retraction relative to their initial assembly state. The control unit takes the actual extension and retraction state of each pneumatic cylinder 134 at this moment as the control zero point of the corresponding push actuator assembly 13, and controls the pneumatic cylinders 134 on this basis to make them relatively elongate or retract relative to the control zero point, thereby applying differentiated radial adjustment thrust to the floating guide sleeve 12. During active adjustment, the pneumatic cylinder 134 provides the driving force for correction, while the preload spring 136 continuously provides basic elastic support and absorbs transient loads during the adjustment process, making the centering adjustment process of the valve stem 5 smoother and more reliable.

[0046] Through the above structural design, this embodiment applies a stable initial preload to the push pin 132 through an adjustable preload structure, enabling the push actuator to form continuous and flexible radial support even in an unadjusted state, avoiding contact instability caused by high-temperature vibration or assembly gaps. The zero point of the pneumatic cylinder 134 is established based on the actual extension and retraction posture under preload, which can naturally eliminate the initial deviation caused by assembly errors, preload differences, and thermal deformation, ensuring that the valve stem 5 centering adjustment is based on the actual force state and improving adjustment accuracy. During the active correction process, the pneumatic cylinder 134 provides differentiated adjustment thrust, and the preload spring 136 absorbs transient impact loads through a composite force method, effectively reducing impact and local stress concentration during the push adjustment process and extending the service life of the push structure and valve stem assembly. The overall structure takes into account both free floating and active control requirements, making it particularly suitable for the long-term high-temperature operation of flat plate valves.

[0047] Example 4: The control unit is equipped with a multi-field coupling hysteresis compensation model. The control logic of the multi-field coupling hysteresis compensation model includes: Using pre-stored material properties, geometric parameters, and thermal conduction boundary conditions of valve body 1 and valve stem 5, the time constant dominated by thermal inertia is solved: ; in, It is a time constant; The density of the material; Specific heat capacity; For component volume; The convective heat transfer coefficient; For heat exchange area; Based on the time constant, the differential thermal expansion time constant matrix is ​​established. The differential thermal expansion time constant matrix is ​​as follows: 1-th order matrix Represents the number of monitoring locations. Represents the number of time steps, matrix elements Indicates the first The monitoring location is at the first The local thermal response time constant of the time step is calculated using the following formula: ; in, For the first The material density at the location; For the first Specific heat capacity at location; For the first Position control volume; For the first Position at The convective heat transfer coefficient at the time step; For the first The heat exchange area at the location; Based on the differential thermal expansion time constant matrix, dynamic data of the medium temperature, and thermal boundary conditions, by comparing the time delay between the temperature response curve of valve body 1 and the medium temperature change curve, it is determined that when the medium temperature undergoes a step change and the convective heat transfer coefficient... Under constant conditions, calculate the thermal response hysteresis time of the valve body 1 internal cavity structure relative to the change in medium temperature: ; The formula is derived based on the first-order lumped heat capacity model and is applicable under the following conditions: the thermal conductivity of the valve body material is ≥15W / (m·K), the Biot number is <0.1, and the medium temperature change rate is ≤50℃ / s; This refers to the thermal response hysteresis time. The valve body time constant; This represents the change in valve body temperature. This refers to the change in temperature of the medium. Based on the thermal response hysteresis time, the pre-stored thermal-structural parameters of valve seat 3, and the prediction time window, the transient thermal-structural sequential coupling algorithm is used to predict the instantaneous deformation of the sealing surface of valve seat 3 at future moments; the mesh size is no greater than 1 / 10 of the characteristic width of the valve seat sealing surface, the time step satisfies the CFL condition, and the thermal expansion coefficient of the material adopts a temperature piecewise linear interpolation model. Based on instantaneous deformation and real-time sensor data, a dynamic tolerance zone is generated on the time axis. Real-time sensor data includes: the eccentric displacement vector of valve stem 5, the opening and closing torque fluctuation value, and the current pressure of each pneumatic cylinder 134. The logic for generating the dynamic tolerance zone is: based on instantaneous deformation... As the centerline of the tolerance zone, the bandwidth is determined by the opening and closing torque fluctuation value. With preset safety factor The tolerance zone range is determined to be: ,in Furthermore, it is dynamically corrected based on the medium pressure; Based on the dynamic tolerance zone, a corresponding pressure control command is generated, controlling the pneumatic cylinder 134 to drive the push pin 132 to apply nonlinear gradual prestress to the floating guide sleeve 12. The nonlinear gradual prestress is applied according to an exponential function law, and the exponential function formula is: ; in, express The thrust applied at any given moment; The target thrust is determined by the maximum allowable deformation threshold of the valve seat sealing surface. and valve stem stiffness coefficient Calculations show that ; To adjust the time constant, characterizing the prestressing reached The time required to achieve the preset percentage (e.g., 63.2%).

[0048] The working principle and beneficial effects of the above technical solution are as follows: In the actual operation of high-temperature flat valves, key components such as valve body 1, valve cover 2, valve seat 3, and valve stem 5 experience uneven heating and significant lag in thermal response. When the medium temperature changes rapidly (such as during process switching or emergency conditions), the internal structure of the valve cannot respond synchronously due to thermal inertia, causing the sealing surface deformation to deviate from the theoretical design value. This problem presents a dual risk: on the one hand, uneven thermal deformation of the valve seat 3 sealing surface can lead to sealing failure and medium leakage; on the other hand, the valve stem 5 and the guide structure generate additional frictional resistance due to asynchronous expansion, which can lead to thermal jamming in severe cases. Traditional high-temperature valves employ passive compensation schemes such as increasing the fitting clearance or uniform cooling, which cannot accurately predict the dynamic thermal deformation state of each component, resulting in a significant reduction in valve reliability under temperature fluctuation conditions.

[0049] In this embodiment, the control unit is equipped with a multi-field coupling hysteresis compensation model, which achieves forward-looking control of thermal deformation by integrating thermal, mechanical and control theories.

[0050] First, the control unit retrieves the material thermophysical parameters (such as thermal conductivity, specific heat capacity, density, coefficient of thermal expansion, etc.), geometric parameters (volume, surface area, characteristic dimensions, etc.), and boundary heat exchange conditions (convective heat transfer coefficient, ambient temperature, etc.) of the key valve components (including valve body 1 and valve stem 5) pre-stored in the memory. It then calculates the characteristic time constant of each component under the dominance of thermal inertia using thermodynamic analysis methods. This time constant reflects the rate at which the component's temperature responds to changes in the external thermal environment and is a fundamental quantitative indicator of thermal hysteresis characteristics.

[0051] Then, based on the aforementioned time constants, a differential thermal expansion time constant matrix is ​​constructed. This matrix, in a discretized manner, describes the local thermal response characteristics of different positions of the valve at different time steps.

[0052] Next, the model combines real-time acquired dynamic data of the medium temperature and thermal boundary conditions, and by comparing and analyzing the time offset between the temperature response curve of the valve body 1 cavity and the medium temperature change curve, it accurately calculates the thermal response lag time of the valve body 1 structure relative to the change in medium temperature. This calculation is particularly suitable for operating conditions where the medium temperature undergoes a step change and the convective heat transfer conditions are stable, and can accurately quantify the time delay effect in the heat conduction process.

[0053] Based on the calculated thermal response hysteresis time and the pre-stored thermal-structural parameters of valve seat 3, the model uses a transient thermal-structural sequential coupling algorithm to predict the instantaneous deformation of the sealing surface of valve seat 3 within a future time window.

[0054] The model integrates the predicted instantaneous deformation with real-time sensor data (including the eccentric displacement vector of valve stem 5, opening and closing torque fluctuations, and the current pressure of each pneumatic cylinder 134) to dynamically generate a tolerance zone on the time axis. The centerline of the tolerance zone corresponds to the predicted optimal sealing surface deformation state, while the bandwidth is dynamically adjusted based on real-time torque fluctuations and a preset safety factor, while also considering the impact of medium pressure fluctuations on bandwidth correction. This dynamic tolerance zone mechanism can adapt to sealing requirements while avoiding excessive correction that introduces additional stress.

[0055] Finally, based on the dynamic tolerance zone, corresponding pressure control commands are generated to control each pneumatic cylinder 134 to drive the push pin 132 to apply nonlinear gradual prestress to the floating guide sleeve 12. This prestress is applied using an exponential function to ensure a smooth transition during the adjustment process and avoid sudden force impacts from interfering with the system's stability.

[0056] This embodiment utilizes a multi-field coupled hysteresis compensation model to anticipate thermal deformation trends and perform preventative corrections before thermal stress accumulates to a dangerous level, significantly improving the sealing reliability and smooth opening and closing of the high-temperature flat valve under temperature fluctuation conditions. Simultaneously, the application strategy of nonlinear gradual prestress effectively reduces mechanical shock during regulation, extending the service life of critical valve components.

[0057] Example 5: Based on the dynamic tolerance zone, a corresponding pressure control command is generated to control the pneumatic cylinder 134 to drive the push pin 132 to apply nonlinear gradual prestress to the floating guide sleeve 12, including: The dynamic tolerance zone is mapped to the target trajectory of the valve stem 5 center in the time domain; the mapping relationship is: the center line of the tolerance zone is used as the target position curve. Establish a two-dimensional correction plane coordinate system with the valve stem 5 axis as the origin, and calculate the correction vector based on the deviation between the target trajectory and the current actual position; the formula for calculating the correction vector is: ; in, For correction vector; The target location coordinates; These are the actual location coordinates; Based on the geometric distribution angles of at least three push actuator components 13 on the circumference, a set of torque coupling equations is constructed: ; ; in, This refers to the number of push actuator components; For the first The angular position of each actuator; For the first The thrust of each actuator; To correct the vector in Component of force in direction; To correct the vector in Component of force in direction; The correction vector and the required correction torque are decoupled and calculated into the target pressure control value for each pneumatic cylinder 134: ; in, For the first The target pressure control value for each actuator; The diameter of the pneumatic cylinder piston is pre-stored in the control unit; Based on the PID closed-loop control algorithm, the sampling period is set. proportionality coefficient Integral time The intake and exhaust volumes of each pneumatic cylinder 134 are dynamically adjusted according to the target pressure control value until the opening and closing torque fluctuation value detected by the multi-parameter sensing unit drops to within the preset stable operation threshold range.

[0058] The working principle and beneficial effects of the above technical solution are as follows: Under high-temperature conditions, the valve stem 5 will not only experience radial displacement due to thermal expansion, but also bend and deform due to uneven temperature gradient distribution, resulting in complex spatial posture changes. Traditional high-temperature valve guiding systems typically assume that the valve stem 5 only undergoes simple radial translation, neglecting the micro-angle changes caused by bending deformation. This leads to edge contact stress between the valve stem 5 and the guide sleeve during actual operation, accelerating wear and causing jamming.

[0059] This embodiment provides a valve stem center trajectory control system for converting dynamic tolerance zones into precise valve stem 5 position adjustment commands.

[0060] First, the system maps the dynamic tolerance zone generated in Example 4 to the target trajectory of the valve stem 5 center in the time domain. The system establishes a two-dimensional correction plane coordinate system on the top of the valve cover 2 with the valve stem 5 axis as the origin. This coordinate system is fixed to the valve cover 2 structure, providing a reference frame for position correction. The system uses the position sensor in the multi-parameter sensing unit to acquire the current actual position coordinates of the valve stem 5 in real time, compares them with the corresponding points on the target trajectory, and calculates the two-dimensional correction vector.

[0061] Then, based on the geometric distribution angles of the three or more push actuator assemblies 13 on the circumference of the guide cavity 11, a force-displacement coupling equation set is constructed. This equation set considers the symmetry of the actuator arrangement, the vector composition characteristics of the forces, and the force balance conditions of the floating guide sleeve 12. By solving the torque balance equation, the two-dimensional correction vector can be decomposed into the thrust components required by each actuator, achieving a precise conversion from position deviation to actuator control quantity. Next, the system further decouples the correction vector and the required correction torque, calculating the independent target pressure control value for each pneumatic cylinder 134.

[0062] Finally, based on the PID closed-loop control algorithm, the intake and exhaust volumes of each pneumatic cylinder 134 are adjusted in real time with a set sampling period. The system continuously monitors the opening and closing torque fluctuation value fed back by the multi-parameter sensing unit. When this value drops to within the preset stable operation threshold range, the adjustment is determined to be complete, and the system enters the maintenance state.

[0063] This embodiment transforms the complex problem of thermal deformation into a precise trajectory tracking problem, achieving comprehensive control over the spatial position of the valve stem 5. The system not only corrects the radial offset of the valve stem 5 but also generates micro-tilt adjustments through the differential thrust of the multi-push actuator assembly 13, adapting to the bending deformation of the valve stem 5 and significantly reducing local contact stress. Simultaneously, the closed-loop control strategy and optimized force distribution ensure the smoothness and accuracy of the adjustment process, avoiding the secondary interference problems caused by traditional unidirectional correction, significantly reducing the opening and closing torque fluctuations of the valve under high-temperature conditions, and improving operational reliability and sealing performance.

[0064] Example 6: The control unit is configured to execute a friction torque spectrum feature separation algorithm for accurate identification of jamming types, including: The opening and closing torque data are sampled at high frequency and a fast Fourier transform is performed to convert the time-domain torque signal into a frequency-domain energy spectrum. Extract the eigenvalues ​​of the low-frequency and high-frequency components from the frequency domain energy spectrum; When the amplitude of the low-frequency component increases monotonically with the temperature and the rate of increase is lower than the preset rate of increase threshold, and the energy value of the high-frequency component is lower than the preset energy threshold, the jamming type is determined to be viscous thermal jamming, and the output command increases the driving thrust of valve stem 5. In this embodiment, the preset rise rate threshold is 0.1 N·m / ℃; the preset energy threshold is 5% of the total spectral energy. When the high-frequency component exhibits an irregular broadband energy surge, accompanied by stick-slip step characteristics of the position signal, the jamming type is determined to be metal adhesion or foreign object embedding. The valve stem 5 lifting drive is stopped, and the push actuator assembly 13 is controlled to perform a high-frequency micro-amplitude reciprocating jitter action to attempt to loosen the adhesion point using alternating inertial force. In this embodiment, the irregular broadband energy surge is: the energy peak of the high-frequency component in the 200Hz-2kHz frequency band exceeds the baseline by more than 3 times; In this embodiment, the stick-slip step characteristic accompanying the position signal is: the position signal exhibits a step displacement fluctuation of more than 0.05 mm within a 10ms time window; In this embodiment, the high-frequency micro-amplitude reciprocating jitter action is performed with a frequency of 50-200Hz and an amplitude of ±0.1mm.

[0065] The working principle and beneficial effects of the above technical solution are as follows: During long-term operation, the valve stem 5 movement mechanism of a high-temperature flat valve may encounter various types of jamming faults, including viscous thermal tightness caused by thermal expansion, adhesion formed by metal-to-metal contact, and embedding of foreign objects carried by the medium. Different types of jamming require different handling strategies, but traditional valve control systems often only monitor the amplitude of the opening and closing torque and lack the ability to identify the type of jamming. The risks posed by this problem are extremely serious: mistaking metal adhesion for ordinary thermal expansion and forcibly increasing the torque will lead to intensified welding of the friction surfaces, causing irreversible damage; conversely, adopting a shaking loosening strategy for viscous thermal tightness will not solve the fundamental problem and will delay process changeover.

[0066] This embodiment provides a friction torque spectrum feature separation algorithm for accurately identifying jamming types and executing targeted processing strategies.

[0067] First, the torque data during the opening and closing process is sampled at high frequency (sampling frequency not less than 2kHz) to obtain a high-resolution time-domain torque signal. Then, a Fast Fourier Transform (FFT) is performed on the sampled data to convert the time-domain signal into a frequency-domain energy spectrum.

[0068] Secondly, two key characteristic values ​​are extracted from the frequency domain energy spectrum: low-frequency component characteristic values ​​(usually referring to the 0-50Hz frequency band) and high-frequency component characteristic values ​​(usually referring to the 200Hz-2kHz frequency band). The low-frequency component mainly reflects macroscopic mechanical resistance, such as the disappearance of thermal expansion gaps and overall problems such as the compression of sealing surfaces; while the high-frequency component reflects microscopic contact states, such as local phenomena such as the interaction of surface roughness, shearing of metal micro-protrusions, and particle collisions.

[0069] Next, the system classifies and identifies the types of jamming based on preset discrimination criteria. For viscous thermal jamming, its spectral characteristics are as follows: the amplitude of the low-frequency component increases monotonically with increasing temperature, but the rate of increase is relatively slow (below the preset rate of increase threshold of 0.1 N·m / ℃); at the same time, the energy value of the high-frequency component is low (below 5% of the total spectral energy). For metal bonding or foreign object embedding, its spectral characteristics are as follows: the high-frequency component exhibits irregular broadband energy surges in the 200Hz-2kHz frequency band (energy peaks exceed the baseline by more than 3 times), accompanied by stick-slip step characteristics of the valve stem position 5 signal (a step displacement fluctuation of more than 0.05 mm occurs within a 10ms time window). This classification method based on multi-dimensional features significantly improves the accuracy and robustness of jamming type identification.

[0070] Finally, a differentiated processing strategy is implemented based on the identification results. When the jamming type is determined to be viscous thermal tightness, the system outputs a command to increase the driving thrust of valve stem 5 (the increase is usually 10%-20% of the rated torque), and simultaneously triggers the thermal deformation compensation mechanism in Examples 4-5. The valve stem position adjustment unit finely adjusts the geometric center of valve stem 5 to increase the mating clearance. When the jamming type is determined to be metal adhesion or foreign object embedding, the system immediately stops the lifting and lowering drive of valve stem 5 to avoid further damage; at the same time, it controls the push actuator assembly 13 to perform high-frequency micro-amplitude reciprocating jitter (at a frequency of 50-200Hz and an amplitude of ±0.1mm), using alternating inertial force to attempt to loosen the adhesion point or shake off the embedded foreign object. The jitter duration is usually set to 1-5 seconds, after which the system attempts to open and close at low speed again and reassess the jamming state.

[0071] While implementing the above processing strategy, the system continuously monitors changes in torque spectrum characteristics to form a closed-loop diagnosis. If the torque fluctuation decreases to the normal range after viscous heat treatment, the current adjustment state is maintained; if the high-frequency energy component decreases significantly after metal bonding treatment, an attempt is made to restore normal operation; if multiple attempts are unsuccessful, the system escalates to an alarm state, prompting manual intervention.

[0072] This embodiment achieves accurate identification and differentiated processing of jamming types by deeply exploring the time-frequency characteristics of torque signals. This not only improves the adaptability of high-temperature flat valves under complex working conditions, but also significantly reduces the risk of misoperation and the rate of unplanned downtime.

[0073] Example 7: The self-sensing thermal balance control system also possesses a self-healing function based on zero-point drift reconstruction, including: The control unit establishes a global coordinate system with the cold assembly center as the origin and a local floating coordinate system with the actual geometric center of the current floating guide sleeve 12 as the origin in the memory; After each high-temperature operation cycle ends, the medium pressure returns to zero, and the temperature drops to ambient temperature, the control unit records the static position of valve stem 5 under no driving force and medium load, and calculates the residual plastic deformation vector of the static position relative to the global coordinate system. When the modulus of the residual plastic deformation vector exceeds the threshold set based on the yield strength of the valve stem material and historical deformation data, the control unit automatically performs coordinate system reconstruction, translating the origin of the local floating coordinate system to the endpoint coordinate position of the residual plastic deformation vector, and using the endpoint coordinate position as the control reference for the next adjustment.

[0074] The working principle and beneficial effects of the above technical solution are as follows: Under long-term high-temperature cyclic conditions, the valve stem 5 of the flat plate valve will undergo cumulative plastic deformation due to repeated thermal stress, resulting in a permanent offset of its geometric center line. Traditional valve control systems usually use the cold assembly center as the only reference datum, which cannot adapt to this permanent deformation. When the system detects the eccentricity of the valve stem 5, it will force the actuator to correct it back to the original center position. This forced correction will introduce additional internal stress into the valve stem 5, which has already undergone plastic deformation, accelerating the generation and propagation of fatigue cracks.

[0075] This embodiment provides a self-healing function based on zero-point drift reconstruction, enabling the system to automatically adapt to the permanent thermal bending of the valve stem 5 and avoid secondary damage caused by forced correction.

[0076] The control unit establishes two sets of coordinate systems in the system memory: one is a global coordinate system with the cold assembly center as the origin, representing the initial design state of the valve; the other is a local floating coordinate system with the actual geometric center of the current floating guide sleeve 12 as the origin, representing the current operating state of the system.

[0077] At the end of each high-temperature operation cycle, after the medium pressure returns to zero and the temperature drops to ambient temperature, the control unit automatically records the static position of valve stem 5 under no driving force or medium load. This position represents the true plastic deformation state of valve stem 5 after the elastic deformation has been eliminated. The system compares this static position with the global coordinate system to calculate the residual plastic deformation vector, which fully describes the direction and magnitude of the permanent deformation of valve stem 5.

[0078] A threshold judgment is performed on the residual plastic deformation vector. When the vector magnitude exceeds the threshold set based on the yield strength of valve stem 5 material and historical deformation data, it is determined that coordinate system reconstruction is required. The threshold setting takes into account the material's safety margin and historical deformation trend, avoiding frequent adjustments for minor deformations while also preventing excessive deformations from being ignored.

[0079] When a reconfiguration is deemed necessary, an automatic coordinate system reconfiguration operation is performed, translating the origin of the local floating coordinate system to the endpoint coordinate position of the residual plastic deformation vector, while simultaneously updating the transformation relationship between the global and local coordinate systems. After reconfiguration, this endpoint coordinate position becomes the control reference for the next adjustment, and all subsequent valve stem 5 position adjustments are centered on this new reference. This smooth-transition reconfiguration strategy ensures control continuity, avoids system oscillations caused by abrupt coordinate system changes, and allows the adjustment action of the push actuator assembly 13 to automatically adapt to the permanent thermal bending of the valve stem 5, preventing secondary internal stress damage caused by forced correction to the cold assembly center.

[0080] During the reconfiguration process, the system also performs a consistency check, comparing the new reference position with the geometric center of the valve seat 3 sealing surface to assess seal integrity. If the offset is too large and may affect sealing performance, the system will generate a warning signal.

[0081] This embodiment constructs two sets of coordinate reference systems: a global coordinate system reflecting the initial design state of the valve, and a local floating coordinate system representing the current operating state. After each thermal cycle, the system captures the natural static position of the valve stem 5 under no external force, accurately quantifying its permanent deformation relative to the original design position. When the deformation exceeds the material safety threshold, the system does not force the valve stem 5 to return to its original position, but intelligently and smoothly migrates the control reference to the new equilibrium point after deformation. This allows the adjustment action of the push actuator assembly 13 to automatically adapt to the permanent bending shape of the valve stem 5, avoiding the secondary internal stress introduced by the traditional forced correction method in the valve stem 5 that has already undergone plastic deformation, significantly reducing the risk of fatigue crack initiation; and enabling the high-temperature flat valve to adapt to its own deformation history, increasing the number of thermal cycle withstands under the same operating conditions.

[0082] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A high-temperature flat plate valve with self-sensing thermal balance regulation, comprising a valve body (1), a valve cover (2), a valve seat (3) disposed within the valve body (1), a gate (4) that moves up and down within the valve body (1) to open and close a flow channel, and a valve stem (5) connected to the gate (4), characterized in that, It also includes a self-sensing thermal balance control system, which includes: The multi-parameter sensing unit includes multiple sensors for acquiring temperature, opening and closing torque, and medium pressure at various positions of the flat panel valve; The control unit, electrically connected to the multi-parameter sensing unit, is configured to generate thermal imbalance state criteria based on the detection data from multiple sensors and output control commands. The valve stem position adjustment unit is located at the valve stem protrusion channel of the valve cover (2) and cooperates with the valve stem (5). It is configured to automatically correct the position of the valve stem (5) under the trigger of the control command. When the torque fluctuation value drops to the preset stable operation threshold range, the adjustment is determined to be completed and the unit enters the maintenance state. The valve stem position adjustment unit includes: A guide cavity (11) is formed on the top of the valve cover (2) and surrounds the valve stem (5); A floating guide sleeve (12) is assembled in the guide cavity (11) and forms a guiding fit with the valve stem (5). There is a gap between the floating guide sleeve (12) and the guide cavity (11) to allow the floating guide sleeve (12) to move laterally relative to the guide cavity (11). At least three push actuator assemblies (13) are arranged circumferentially along the guide cavity (11) and perform differential radial push towards the floating guide sleeve (12) so that the floating guide sleeve (12) generates lateral displacement and / or micro tilt angle adjustment relative to the guide cavity (11). The push actuator assemblies (13) are electrically connected to the control unit. The floating guide sleeve (12) includes an outer sleeve (121) and an inner guide layer (122) disposed in the inner hole of the outer sleeve (121). The inner guide layer (122) is made of a high-temperature resistant and low-friction material. The outer circle of the outer sleeve (121) is provided with a force-bearing plane corresponding to the push actuator assembly (13). The push end of the push actuator assembly (13) presses against the corresponding force-bearing plane. A reset elastic ring (15) is provided between the outer sleeve (121) and the guide cavity (11) for applying an elastic restoring force to the outer sleeve (121) to reset it to the center position. The push actuator assembly (13) includes: The actuator housing (131) is connected to the radial mounting port of the valve cover (2), and a heat insulation layer is provided inside it; The push pin (132) is slidably disposed in the actuator housing (131) along the radial direction. Its inner end extends into the guide cavity (11) and is connected to a wear-resistant ball head (133). The wear-resistant ball head (133) presses against the floating guide sleeve (12). A pneumatic cylinder (134) is installed inside the actuator housing (131) and connected to the push pin (132). The pneumatic cylinder (134) is electrically connected to the control unit. Among them, the pneumatic cylinder (134) is in a free-following state when it does not receive a control command, and passively extends and retracts with the displacement of the push pin (132); When the control unit determines that the position of the valve stem (5) needs to be adjusted, the extension and retraction state of the pneumatic cylinder (134) at that moment is taken as the control zero point, and on this basis, the pneumatic cylinder (134) is controlled to generate relative extension and retraction to drive the push pin (132) to apply adjustment thrust to the floating guide sleeve (12).

2. The high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 1, characterized in that, The valve stem position adjustment unit also includes a spherical support seat (14), which includes a central concave seat ring (141) and a convex bearing ring (142) connected to the floating guide sleeve (12). The concave seat ring (141) and the convex bearing ring (142) are in spherical sliding contact fit, allowing the convex bearing ring (142) to slide and rotate relative to the concave seat ring (141).

3. The high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 1, characterized in that, The push actuator assembly (13) also includes: The pre-tightening plate (135) is slidably disposed within the actuator housing (131); A preload spring (136) is installed between the preload pressure plate (135) and the outer end of the push pin (132) to apply a radially inward preload force to the push pin (132); Adjusting screw (137) is connected to the outer end of actuator housing (131) and its end abuts against preload plate (135) to set the initial preload of push pin (132).

4. A high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 1, characterized in that, The control unit is equipped with a multi-field coupling hysteresis compensation model. The control logic of the multi-field coupling hysteresis compensation model includes: The material properties, geometric parameters and thermal conduction boundary conditions of the valve body (1) and valve stem (5) are called in advance to solve the time constant dominated by thermal inertia; Based on the time constant, establish the differential thermal expansion time constant matrix; Based on the differential thermal expansion time constant matrix, medium temperature dynamic data and thermal boundary conditions, by comparing the time delay between the temperature response curve of the valve body (1) cavity and the medium temperature change curve, under the condition that the medium temperature undergoes a step change and the convective heat transfer coefficient is constant, the thermal response lag time of the valve body (1) cavity structure relative to the medium temperature change is calculated. Based on the thermal response hysteresis time, the pre-stored thermal-structural parameters of the valve seat (3) and the prediction time window, the transient thermal-structural sequential coupling algorithm is used to predict the instantaneous deformation of the sealing surface of the valve seat (3) at future moments. Based on the instantaneous deformation and real-time sensor data, a dynamic tolerance zone is generated on the time axis; the real-time sensor data includes: the eccentric displacement vector of the valve stem (5), the opening and closing torque fluctuation value, and the current pressure of each pneumatic cylinder (134); the generation logic of the dynamic tolerance zone is: the instantaneous deformation is used as the center line of the tolerance zone, and the bandwidth is determined by the opening and closing torque fluctuation value and the preset safety factor. Based on the dynamic tolerance zone, the corresponding pressure control command is generated, and the pneumatic cylinder (134) is controlled to drive the push pin (132) to apply nonlinear gradual prestress to the floating guide sleeve (12).

5. A high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 4, characterized in that, Based on the dynamic tolerance zone, a corresponding pressure control command is generated to control the pneumatic cylinder (134) to drive the push pin (132) to apply nonlinear gradual prestress to the floating guide sleeve (12), including: The dynamic tolerance zone is mapped to the target trajectory of the valve stem (5) center in the time domain; the mapping relationship is: the center line of the tolerance zone is taken as the target position curve; Establish a two-dimensional correction plane coordinate system with the valve stem (5) axis as the origin, and calculate the correction vector based on the deviation between the target trajectory and the current actual position; A set of torque coupling equations is constructed based on the geometric distribution angles of at least three push actuator components (13) on the circumference; The correction vector and the required correction torque are decoupled and calculated as the target pressure control value for each pneumatic cylinder (134); Based on the PID closed-loop control algorithm, the intake and exhaust volumes of each pneumatic cylinder (134) are dynamically adjusted according to the target pressure control value until the opening and closing torque fluctuation value detected by the multi-parameter sensing unit drops to the preset stable operation threshold range.

6. A high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 1, characterized in that, The control unit is configured to execute a friction torque spectrum feature separation algorithm for accurate identification of jamming types, including: The opening and closing torque data are sampled at high frequency and a fast Fourier transform is performed to convert the time-domain torque signal into a frequency-domain energy spectrum. Extract the eigenvalues ​​of the low-frequency and high-frequency components from the frequency domain energy spectrum; When the amplitude of the low-frequency component increases monotonically with the temperature and the rate of increase is lower than the preset rate of increase threshold, and the energy value of the high-frequency component is lower than the preset energy threshold, the jamming type is determined to be viscous thermal jamming, and the output command increases the driving thrust of the valve stem (5). When the high-frequency component exhibits an irregular broadband energy surge, accompanied by a stick-slip step characteristic of the position signal, the jamming type is determined to be metal adhesion or foreign object embedding. The valve stem (5) lifting drive is stopped, and the push actuator assembly (13) is controlled to perform a high-frequency micro-amplitude reciprocating jitter action, using alternating inertial force to attempt to loosen the adhesion point.

7. A high-temperature flat plate valve with self-sensing thermal balance regulation as described in claim 1, characterized in that, The self-sensing thermal balance control system also possesses a self-healing function based on zero-point drift reconstruction, including: The control unit establishes a global coordinate system with the cold assembly center as the origin and a local floating coordinate system with the actual geometric center of the current floating guide sleeve (12) as the origin in the memory; After each high-temperature operation cycle ends, the medium pressure returns to zero and the temperature drops to the ambient temperature, the control unit records the static position of the valve stem (5) under no driving force and medium load, and calculates the residual plastic deformation vector of the static position relative to the global coordinate system. When the modulus of the residual plastic deformation vector exceeds the threshold set based on the yield strength of the valve stem material and historical deformation data, the control unit automatically performs coordinate system reconstruction, translates the origin of the local floating coordinate system to the endpoint coordinate position of the residual plastic deformation vector, and uses the endpoint coordinate position as the control reference for the next adjustment, so that the adjustment action of the push actuator assembly (13) automatically adapts to the permanent thermal bending of the valve stem (5) and prevents secondary internal stress damage caused by forced correction to the cold assembly center.

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