Flat valve with low-temperature detection function

Abstract

The invention relates to the technical field of flat valves, and discloses a flat valve with a low-temperature detection function, comprising: a valve body, a medium channel is arranged in the valve body, two valve seats are movably arranged in the medium channel along the axial direction, and a valve plate is slidably arranged between the two valve seats in a sealing manner; the low-temperature detection unit is arranged on the valve body and used for monitoring the temperature in the valve cavity in real time; and the temperature control compensation unit is arranged on the valve body in a sliding mode and applies pressure to the valve seat in the axial direction, and the temperature control compensation unit and the low temperature detection unit are electrically connected with the controller and used for adjusting the pressing force between the valve plate and the valve seat according to temperature changes. Real-time data collection of the temperature of the valve cavity is achieved through the integrated low-temperature detection unit, compensation thrust can be automatically generated through the temperature control compensation unit according to temperature changes, automatic adjustment of pressing force is achieved, the risk of sealing performance reduction, jamming or leakage caused by inconsistent material thermal shrinkage of a traditional valve at the low temperature is avoided, and the service life of the valve is prolonged. And the overall low temperature resistance and the sealing stability of the valve are improved.

Description

Technical Field

[0001] This invention relates to the field of flat plate valve technology, and more specifically, to a flat plate valve with low temperature detection function. Background Technology

[0002] Flat gate valves, as a common fluid control device, are widely used in the petroleum, chemical, and natural gas industries to cut off or regulate the flow of media. The core function of a flat gate valve is to be fully open or fully closed, achieving reliable cutoff and isolation of pipeline media. Flat gate valves are widely used in long-distance oil and gas pipelines, wellhead equipment (oil / gas production trees), and purification, storage, and transportation systems in the oil and gas industry.

[0003] Under normal temperature conditions, flat plate valves provide reliable sealing performance and operational stability. However, in liquefied natural gas transportation or applications in extremely cold regions, they face low-temperature conditions. Because components such as the valve body, seat, and plate are made of different materials with varying coefficients of thermal contraction, the sealing surface gap increases and the clamping force weakens at low temperatures, leading to problems such as sealing failure, valve plate jamming, or media leakage. Current technologies primarily address these issues through manual adjustment or the use of special materials, but these methods are slow to respond, costly, and cannot achieve real-time monitoring and adjustment.

[0004] Therefore, it is necessary to propose a flat plate valve with low-temperature detection function 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. This summary section 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 flat plate valve with low-temperature detection function, comprising: The valve body has a medium channel inside, and two valve seats are axially movable inside the medium channel. A valve plate is slidably and sealingly disposed between the two valve seats. A low-temperature detection unit is installed on the valve body to monitor the temperature inside the valve cavity in real time. The temperature control compensation unit is slidably mounted on the valve body and applies pressure to the valve seat. The temperature control compensation unit and the low temperature detection unit are electrically connected to the controller and are used to adjust the clamping force between the valve plate and the valve seat according to temperature changes.

[0007] Preferably, the top of the valve plate is connected to the valve stem, and the top of the valve stem is connected to a handwheel drive mechanism that drives its movement.

[0008] Preferably, the temperature control compensation unit includes: An annular groove is coaxially formed on the valve body and located on the side of the valve seat away from the valve plate; The adjusting ring is slidably disposed in the annular groove and its end is pressed against the valve seat end face. The outer side of the adjusting ring is configured as a conical outer wall. An elastic element is provided between the adjusting ring and the end of the annular groove to maintain the clamping force of the adjusting ring on the valve seat; A temperature compensation component, installed in an annular groove, is used to apply pressure to the conical surface of the adjusting ring at low temperatures to make the adjusting ring move axially.

[0009] Preferably, the temperature compensation component includes a gap adjustment assembly, which includes: The mounting ring is installed in the annular groove and coaxially positioned on the outside of the adjusting ring. Multiple drive cavities are arranged in the mounting ring along the circumferential direction. An electric telescopic rod is installed in each drive chamber and electrically connected to the controller; The compensation drive component is slidably disposed in the drive cavity. The outer side of the compensation drive component is connected to the telescopic end of the electric telescopic rod. A drive block is disposed on the inner side of the compensation drive component. The drive block slides and extends into the annular groove to abut against the outer wall of the adjustment ring.

[0010] Preferably, the temperature compensation component further includes an antifreeze replenishment assembly, which includes: An antifreeze replenishment ring is fitted onto the outside of the valve body and has multiple outlets along the circumference. The inlet of the antifreeze replenishment ring is connected to the antifreeze storage tank above the valve body. A partition plate is slidably disposed on the inner wall of the drive cavity and divides the drive cavity into an outer cavity and an inner cavity. The outer cavity is provided with a fluid inlet corresponding to the antifreeze replenishment ring, and the inner cavity is used to accommodate the compensation drive component. One end of the partition plate is connected to the inner wall of the drive cavity by a spring, and the other end is sealed against the side of the electric telescopic rod. The sealing element is installed on the outer wall of the fixed end of the electric telescopic rod, and a first channel connecting the outer cavity and the inner cavity is provided in the middle. The end of the partition plate is provided with an arc-shaped sealing groove adapted to the end of the sealing element. The cross-section of the sealing element is set as spherical, and the cross-sectional diameter of the arc-shaped sealing groove is larger than the cross-sectional diameter of the sealing element.

[0011] Preferably, the compensation drive component has a liquid storage chamber inside, and a second channel connecting the liquid storage chamber and the inner cavity is provided on its outer side; the outer side of the compensation drive component is configured to match the curvature of the inner side of the partition plate.

[0012] Preferably, a heat pipe is provided inside the compensation drive component, a heating wire is embedded in the heat pipe or it is connected to a heat source supply device, and the drive block is made of a high thermal conductivity material.

[0013] Preferably, the low-temperature detection unit includes: A temperature sensor array, with multiple temperature sensors arranged along the circumference of the valve body, is used to collect temperature data at different locations within the valve cavity. The signal processing module, electrically connected to the temperature sensor array, is used to filter and digitize the collected temperature data to obtain the temperature inside the valve chamber.

[0014] Preferably, the signal processing module performs the following operations: Iterate through the temperature sensors in the temperature sensor array and obtain the setting position identifier of the temperature sensor being iterated; Based on the set location identifier and the construction conditions of the fusion sensing network, a local fusion sensing network is constructed for the target location corresponding to the set location identifier; Based on the temperature sensing path of each network node in the local fusion sensing network to the target location, the path feature set of the temperature sensing path is extracted. Based on the path feature set of the temperature sensing path, determine the sensing result correction strategy with the highest matching degree in the sensing result correction strategy library; The temperature sensing results of the corresponding temperature sensing path are corrected based on the sensing result correction strategy to obtain the correction result; Calculate the deviation between the correction results for each network node; If the deviation is greater than the preset deviation threshold, the corresponding network nodes are removed in order of increasing matching degree based on the correction result and the corresponding perception result correction strategy, until the deviation between the correction results of the network nodes falls within the preset deviation range. The average value of the correction result of the current network node and the detection value of the temperature sensor being traversed is obtained and used as the temperature data of the target location. Once all temperature sensors in the temperature sensor array have been traversed, the temperature inside the valve chamber is obtained.

[0015] Preferably, the temperature control compensation unit also performs the following operations: Calculate the temperature gradient distribution within the valve cavity based on the real-time monitored temperature. Based on the temperature gradient distribution and thermal expansion coefficient database, the difference in shrinkage between the valve seat and the valve plate is calculated. Determine the required compensation stroke of the adjusting ring based on the difference in shrinkage. Based on the historical compensation records of the regulating ring, obtain the remaining limit compensation stroke; If the remaining limit compensation stroke is greater than or equal to the required compensation stroke, the target PWM control signal of the electric telescopic rod is determined according to the conversion relationship between the compensation stroke of the regulating loop and the telescopic stroke of the electric telescopic rod. The electric telescopic pole is controlled to extend and retract accordingly based on the target PWM control signal output by the controller. If the remaining limit compensation stroke is less than the required compensation stroke, a warning signal will be sent to the remote monitoring system through the audible and visual alarm device and the wireless communication module.

[0016] Preferably, the temperature control compensation unit obtains the remaining limit compensation stroke based on the historical compensation records of the regulating loop, including: Calculate the radius difference between the adjusting ring and the mounting ring; Based on historical compensation records, determine the historical compensation stroke of the regulating ring; Construct finite element models of the mounting ring and the adjusting ring, wherein the finite element models include the geometric parameters, material properties and boundary constraints of the mounting ring and the adjusting ring; Based on the simulated boundary conditions, component distributed loads are applied to the finite element model to obtain the simulation results after loading is completed; the component distributed loads include the forces acting on each component and the adjusting ring within the mounting ring, as well as the thermal stress caused by the temperature gradient; The instability critical point is determined based on the simulation results, and the axial displacement of the regulating ring is obtained when the regulating ring and the mounting ring have not reached the instability state based on the boundary conditions associated with the instability critical point. The remaining limit compensation stroke is determined based on the radius difference, historical compensation stroke, and axial displacement.

[0017] Compared with the prior art, the present invention provides a flat plate valve with low temperature detection function, which has at least the following beneficial effects: by integrating a low temperature detection unit, real-time data acquisition of valve cavity temperature is realized; by using a temperature control compensation unit, a compensation thrust can be automatically generated according to temperature changes, realizing automatic adjustment of clamping force, avoiding the risk of reduced sealing performance, jamming or leakage caused by inconsistent thermal shrinkage of materials in traditional valves at low temperatures, and improving the overall low temperature resistance and sealing stability of the valve.

[0018] The present invention provides a flat plate valve with low-temperature detection function. Other advantages, objectives and features of the present invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of the invention. Attached Figure Description

[0019] 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 flat plate valve with low-temperature detection function according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a flat plate valve with low-temperature detection function according to the present invention. Figure 2 ; Figure 3This is a schematic diagram of the installation structure of the temperature control compensation 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 temperature compensation component in this invention; Figure 6 This is a partial structural schematic diagram of the temperature compensation component in this invention (low temperature compensation state). Figure 7 This is a partial structural schematic diagram of the temperature compensation component in this invention (under normal temperature conditions). Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle.

[0020] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve plate; 4. Temperature control compensation unit; 5. Valve stem; 6. Handwheel drive mechanism; 11. Annular groove; 12. Adjusting ring; 13. Elastic element; 14. Antifreeze replenishment ring; 15. Mounting ring; 16. Refill port; 17. Electric telescopic rod; 18. Compensation drive element; 19. Drive block; 21. Divider plate; 22. Outer cavity; 23. Inner cavity; 24. Sealing element; 25. First channel; 26. Liquid storage chamber; 27. Second channel; 28. Heat pipe; 29. ​​Arc-shaped sealing groove. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] Example 1: As Figures 1-3 As shown, the present invention provides a flat plate valve with low temperature detection function, comprising: The valve body 1 has a medium channel inside, and two valve seats 2 are axially movable inside the medium channel. A valve plate 3 is slidably and sealingly disposed between the two valve seats 2. A low-temperature detection unit is installed on valve body 1 to monitor the temperature inside the valve cavity in real time; Temperature control compensation unit 4 is slidably disposed on valve body 1 and applies axial pressure to valve seat 2. Temperature control compensation unit 4 and low temperature detection unit are electrically connected to controller and are used to adjust the clamping force between valve plate 3 and valve seat 2 according to temperature changes.

[0024] The valve stem 5 is connected to the top of the valve plate 3, and the handwheel drive mechanism 6 that drives the valve stem 5 is connected to the top of the valve stem 5.

[0025] The working principle and beneficial effects of the above technical solution are as follows: This invention provides a flat plate valve with low-temperature detection function. The valve body 1 contains axially movable valve seats 2, which press against the sides of a valve plate 3 to ensure stable movement of the valve plate 3. The low-temperature detection unit includes a temperature sensor, thermocouple, etc., to monitor temperature changes within the valve cavity in real time and transmit the data to the controller. A handwheel drive mechanism 6 drives the valve stem 5 to move, causing the valve plate 3 to move up and down, controlling the flow of the medium. When a temperature drop is detected, the controller analyzes the temperature data according to a preset algorithm and drives the temperature control compensation unit 4 to move the valve seats 2 towards the valve plate 3, thereby increasing the clamping force between the valve plate 3 and the valve seats 2. This compensates for material shrinkage and increased sealing gap caused by low temperature, ensuring tight contact between the sealing surfaces.

[0026] The above structural design provides a flat plate valve with low-temperature detection function. By integrating a low-temperature detection unit, it can acquire real-time data on the valve cavity temperature. The temperature control compensation unit can automatically generate compensation thrust according to temperature changes, realizing automatic adjustment of clamping force. This avoids the risk of reduced sealing performance, jamming, or leakage caused by inconsistent thermal shrinkage of materials in traditional valves at low temperatures, and improves the overall low-temperature resistance and sealing stability of the valve.

[0027] Example 2: As Figures 3-8 As shown, based on the above embodiment 1, the temperature control compensation unit 4 includes: An annular groove 11 is coaxially formed on the valve body 1 and located on the side of the valve seat 2 away from the valve plate 3; The adjusting ring 12 is slidably disposed in the annular groove 11 and its end is pressed against the end face of the valve seat 2. The outer side of the adjusting ring 12 is configured as a conical outer wall. The elastic element 13 is disposed between the adjusting ring 12 and the end of the annular groove 11 to maintain the clamping force of the adjusting ring 12 on the valve seat 2; A temperature compensation component is installed in the annular groove 11 and is used to apply pressure to the conical surface of the adjusting ring 12 at low temperatures to make the adjusting ring 12 move axially.

[0028] The working principle and beneficial effects of the above technical solution are as follows: The annular groove 11 serves as the moving cavity of the compensation mechanism, allowing the adjusting ring 12 to slide axially. An elastic element 13 is positioned between the adjusting ring and the end of the annular groove, providing initial clamping force so that the valve seat 2 is stably pressed against the valve plate 3 when the valve operates at a preset temperature. When the temperature decreases, the temperature compensation element applies pressure to the conical surface of the adjusting ring 12. The conical outer wall of the adjusting ring 12 converts the lateral force generated by the temperature compensation element into an axial force, causing the adjusting ring 12 to move axially, further compressing the valve seat 2 and adjusting the pressure between the valve seat 2 and the valve plate 3, thus achieving pressure compensation. Through this structural design, the sliding adjustment of the adjusting ring 12, combined with the amplified pressure torque by the conical structure, ensures that the compensation force is evenly distributed on the valve seat 2, avoiding deformation caused by localized stress concentration. The elastic element 13 ensures that the valve seat 2 maintains initial clamping force on the valve plate 3 at different temperatures, and that the valve seat 2 has the ability to reset under the erosion of the medium at different temperatures.

[0029] Example 3: Based on Example 2 above, the temperature compensation component includes a gap adjustment assembly, which includes: The mounting ring 15 is installed in the annular groove 11 and coaxially disposed on the outside of the adjusting ring 12. Multiple drive cavities are arranged in the mounting ring 15 along the circumferential direction. The electric telescopic rod 17 is installed in each drive chamber and electrically connected to the controller; The compensation drive component 18 is slidably disposed in the drive cavity. The outer side of the compensation drive component 18 is connected to the telescopic end of the electric telescopic rod 17. The inner side of the compensation drive component 18 is provided with a drive block 19. The drive block 19 slides and engages with the inner side of the mounting ring 15 and extends into the annular groove 11 to abut against the outer wall of the adjusting ring 12.

[0030] The working principle and beneficial effects of the above technical solution are as follows: Multiple drive chambers are provided within the mounting ring 15. The electric telescopic rod 17 within each drive chamber can be independently adjusted, controlling the radial movement of the compensation drive component 18. When the temperature reported by the low-temperature detection unit is within a preset range, the controller controls the electric telescopic rod 17 to remain in a retracted state. At this time, the drive block 19 retracts into the mounting ring 15, not contacting the adjusting ring 12. When the pressure fluctuates within the valve cavity, the adjusting ring 12 can move slightly with the valve seat 2 and remain in a pressed state. When the temperature reported by the low-temperature detection unit is lower than the preset value, the controller activates the extension of the electric telescopic rod 17, pushing the compensation drive component 18 inward. The extension of the drive block 19 increases, pushing the outer wall of the adjusting ring 12 to generate axial displacement, thereby compensating for the pressure on the valve seat 2.

[0031] Through the above structural design, multiple circumferentially arranged electric telescopic rods 17 are used to achieve multi-point pressure loading compensation, making the valve seat 2 more evenly stressed and avoiding uneven loading that could cause the valve plate 3 to tilt or cause local sealing failure. The electric telescopic rods 17 have a fast response speed and high control precision, and can be dynamically compensated with real-time temperature data to keep the valve in optimal sealing condition under different temperature conditions.

[0032] Example 4: Based on Example 3 above, the temperature compensation component further includes an antifreeze replenishment assembly, which includes: Antifreeze replenishment ring 14 is sleeved on the outside of valve body 1 and has multiple outlets along the circumferential direction. The inlet of antifreeze replenishment ring 14 is connected to the antifreeze storage tank above valve body 1. The partition plate 21 is slidably disposed on the inner wall of the drive cavity and divides the drive cavity into an outer cavity 22 and an inner cavity 23. The outer cavity 22 is provided with a liquid inlet 16 corresponding to the antifreeze replenishment ring 14, and the inner cavity 23 is used to accommodate the compensation drive component 18. The sealing element 24 is disposed on the outer wall of the fixed end of the electric telescopic rod 17, and a first channel 25 connecting the outer cavity 22 and the inner cavity 23 is provided in the middle.

[0033] The compensation drive component 18 is provided with a liquid storage chamber 26, and a second channel 27 connecting the liquid storage chamber 26 and the inner cavity 23 is provided on its outer side. The outer side of the compensation drive component 18 is set to match the curvature of the inner side of the partition plate 21.

[0034] The working principle and beneficial effects of the above technical solution are as follows: In frequent low-temperature environments, the gap adjustment component is prone to freezing and jamming, which obstructs the transmission process and affects the reliability of compensation and long-term operation. By integrating an antifreeze replenishment component into the temperature compensation component, antifreeze from the antifreeze tank enters the antifreeze replenishment ring 14, maintaining the antifreeze injection pressure under gravity. The partition plate 21 divides the drive chamber into an outer cavity 22 and an inner cavity 23, with the outer cavity 22 used for introducing antifreeze.

[0035] When the temperature is within the preset range and no low-temperature compensation is performed, the electric telescopic rod 17 is in the retracted state, so that the compensation drive 18 fits against the surface of the sealing component 24. The curvature of the two matches, which can completely block the second channel 27, so that the antifreeze passing through the first channel 25 cannot enter the liquid storage chamber 26 and inner cavity 23 of the compensation drive 18, and no liquid replenishment is required, which is suitable for the temperature state at this time.

[0036] When the temperature is lower than the preset value, low-temperature compensation is performed. The electric telescopic rod 17 extends, separating the compensation drive 18 from the sealing component 24. At this time, the second channel 27 is connected to the inner cavity 23. The antifreeze in the outer cavity 22 enters the inner cavity 23 through the first channel 25. Part of the antifreeze enters the reservoir 26 of the compensation drive 18 and moves inward with the compensation drive 18, bringing the antifreeze closer to the inside of the valve body and improving the antifreeze effect. Another part of the antifreeze enters the edge area of ​​the inner cavity 23 to lubricate the periphery of the compensation drive 18 and increase the total amount of antifreeze so that it can fill the inner cavity 23 and ensure the antifreeze capability.

[0037] When the temperature returns to the preset range, the electric telescopic rod 17 retracts, pulling the compensation drive 18 to reset outward. Part of the antifreeze flows back into the outer cavity 22 for storage and reserve, while the other part of the antifreeze remains in the inner cavity 23 for lubrication of the compensation drive 18.

[0038] Through the above structural design, an on-demand antifreeze supply and intelligent reflux design are adopted. Refilling is initiated during low-temperature compensation, and automatic reflux storage occurs after compensation. This avoids waste and system burden caused by continuous refilling, resulting in greater energy savings compared to conventional continuous heating solutions. The integrated design of antifreeze and lubrication functions allows the antifreeze to also provide antifreeze properties while acting as a lubricant during the movement of the compensation drive components, reducing wear and extending component life. This solves the problem of transmission obstruction of drive components in low-temperature environments, as seen in conventional antifreeze solutions, thus improving the antifreeze capability and operational reliability of the flat valve. Furthermore, in the antifreeze replenishment assembly, the cross-sectional diameter of the arc-shaped sealing groove 29 is larger than that of the sealing component 24. This ensures that control separation is achieved through the guide gap when the channel is blocked, and the gap automatically adjusts the replenishment path to guarantee a continuous supply of antifreeze, significantly improving system reliability.

[0039] Example 5: Based on Example 4 above, one end of the partition plate 21 is connected to the inner wall of the drive cavity by a spring, and the other end is sealed against the side of the electric telescopic rod 17; the end of the partition plate 21 is provided with an arc-shaped sealing groove 29 adapted to the end of the sealing member 24, the cross section of the sealing member 24 is set as spherical, and the cross-sectional diameter of the arc-shaped sealing groove 29 is larger than the cross-sectional diameter of the sealing member 24.

[0040] The working principle and beneficial effects of the above technical solution are as follows: During normal fluid replenishment, the arc-shaped surface of the end of the partition plate 21 abuts against the arc-shaped sealing groove 29 of the sealing member 24, maintaining a sealed state. Antifreeze can only enter the inner cavity 23 through the first channel 25, ensuring a stable and effective replenishment process. When any of the first channels 25 becomes blocked, because the cross-sectional diameter of the arc-shaped sealing groove 29 is larger than that of the sealing member 24, and both have arc-shaped surfaces, a gap exists on both sides after sealing. Antifreeze squeezes the end of the partition plate 21 through this gap, causing it to move under antifreeze pressure and separate from the sealing member 24. Antifreeze can then enter the inner cavity 23 through the gap between the partition plate 21 and the sealing member 24. Furthermore, during the antifreeze entry process, guided by the arc-shaped sealing groove 29 and the arc-shaped surface of the sealing member 24, the flow of antifreeze is smoother, preventing antifreeze spraying during connection and ensuring stable antifreeze replenishment.

[0041] Through the above structural design, when the first channel 25 for replenishment becomes blocked in a frequent low-temperature environment, the partition plate 21 can be automatically opened to replenish antifreeze through the structural gap, while controlling the flow of antifreeze to avoid spraying during replenishment, reduce the shaking of the compensation drive 18, and make the compensation response smoother.

[0042] Example 6: Based on Example 3 above, a heat pipe 28 is provided inside the compensation drive component 18, a heating wire is embedded inside the heat pipe 28 or it is connected to a heat source supply device, and the drive block 19 is made of a high thermal conductivity material.

[0043] The working principle and beneficial effects of the above technical solution are as follows: At low temperatures, the heating wire is energized or supplied with heat from a heat source, generating heat that is efficiently transferred to the drive block via a heat pipe. High thermal conductivity materials (such as copper alloys) rapidly diffuse the heat, heating the contact surface of the regulating ring 12, preventing freezing and aiding in compensation. The compensation drive component 18 integrates a heat pipe and heating mechanism, solving the problem of low-temperature heat loss, preventing component freezing, and improving the stability of the compensation force.

[0044] Example 7: Based on Example 1 above, the low-temperature detection unit includes: A temperature sensor array consists of multiple temperature sensors arranged along the circumference of the valve body 1 to collect temperature data at different locations within the valve cavity.

[0045] In this embodiment, the temperature sensor array is a group of physical temperature sensors (such as thermocouples or thermistors) installed circumferentially within the valve cavity. The temperature data is directly measured by the temperature sensors.

[0046] The signal processing module, electrically connected to the temperature sensor array, is used to filter and digitize the acquired temperature data to obtain the temperature inside the valve chamber. Specifically, the signal processing module performs the following operations: Iterate through the temperature sensors in the temperature sensor array and obtain the setting position identifier of the temperature sensor being iterated.

[0047] In this embodiment, the location identifier is set as a unique code for the physical installation location (such as angle or coordinate) of the temperature sensor within the valve cavity.

[0048] Based on the set location identifier and the construction conditions of the fusion sensing network, a local fusion sensing network is constructed for the target location corresponding to the set location identifier.

[0049] In this embodiment, the target location is the physical location within the valve chamber corresponding to the set location identifier. The construction conditions for the fusion sensing network are preset manually, for example: temperature sensors within 10cm of the target location corresponding to the set location identifier meet the construction conditions.

[0050] Based on the temperature sensing path of each network node in the local fusion sensing network to the target location, the path feature set of the temperature sensing path is extracted.

[0051] In this embodiment, the temperature sensing path is a virtual signal propagation path from the temperature sensor location corresponding to the network node to the target location. The path feature set is a set of quantified features (such as distance, material, obstacles) that describe the attributes of the temperature sensing path. For example, the temperature sensing path from sensor A to the target location is as follows: the path is a straight line, 4cm long, passes through the stainless steel valve body material, and has no fluid turbulence obstruction; then the path feature set = {distance 4.0cm, material stainless steel 304, no obstruction, ambient temperature 25°C}.

[0052] Based on the path feature set of the temperature sensing path, the sensing result correction strategy with the highest matching degree in the sensing result correction strategy library is determined.

[0053] In this embodiment, the perception result correction strategy library is a database containing various correction strategies for adjusting raw temperature data and compensating for path effects, with each strategy optimized for specific path features. The matching degree represents the feature similarity between the path feature set and the path feature set targeted by the correction strategies in the perception result correction strategy library.

[0054] The temperature sensing results of the corresponding temperature sensing path are corrected based on the sensing result correction strategy to obtain the correction result.

[0055] In this embodiment, the correction result is the optimized temperature value obtained by applying a perception result correction strategy to the direct perception result of the target location by the network nodes in the local fusion perception network.

[0056] Calculate the deviation between the correction results for each network node.

[0057] In this embodiment, the deviation is the standard deviation between multiple correction results, which is used to quantify the inconsistency between multiple correction results.

[0058] If the deviation is greater than the preset deviation threshold, the corresponding network nodes are removed in order of increasing matching degree based on the correction result and the corresponding perception result correction strategy, until the deviation between the correction results of the network nodes falls within the preset deviation range. The average value of the correction result of the current network node and the detection value of the temperature sensor being traversed is obtained and used as the temperature data of the target location.

[0059] In this embodiment, the preset deviation threshold and the preset deviation range are set manually.

[0060] Once all temperature sensors in the temperature sensor array have been traversed, the temperature inside the valve chamber is obtained.

[0061] In this embodiment, the temperature inside the valve chamber is a collection of temperature data from all target locations, forming a temperature distribution map.

[0062] The working principle and beneficial effects of the above technical solution are as follows: When detecting the temperature inside the valve cavity, the detection results of a single temperature sensor are unstable. Therefore, a temperature sensor array can be used for collaborative measurement. However, when multiple temperature sensors are used for collaborative measurement, the sensing data is affected by the sensing path. Therefore, this invention introduces a fusion sensing network construction condition to construct a local fusion sensing network with a location identifier corresponding to the target location. After the local fusion sensing network is constructed, the path feature set of the temperature sensing path of each network node to the target location is extracted. A sensing result correction strategy is matched from the sensing result correction strategy library to correct the direct sensing results of the network nodes to the target location, and a correction result is obtained. It is determined whether the deviation between the correction results of the network nodes falls within a preset deviation range. If not, the corresponding network nodes are removed in order of increasing matching degree of the correction result-to-sensing result correction strategy until the deviation falls within the preset deviation range. The average value of the correction result corresponding to the current network node and the detection value of the temperature sensor being traversed is used as the temperature data of the target location. After all temperature sensors in the temperature sensor array have been traversed, a set of temperature data for all target locations (temperature inside the valve cavity) is obtained. This invention avoids false alarms caused by a single temperature sensor and, when multiple temperature sensors work together to measure, takes into account the influence of the sensing path, which greatly improves the accuracy of temperature detection in the valve cavity.

[0063] Example 8: Based on Example 5 above, the temperature control compensation unit 4 also performs the following operations: The temperature gradient distribution within the valve cavity is calculated based on the real-time monitored temperature.

[0064] In this embodiment, the temperature gradient distribution is the spatial distribution of the rate of temperature change at different locations within the valve cavity.

[0065] Based on the temperature gradient distribution and thermal expansion coefficient database, the difference in shrinkage between valve seat 2 and valve plate 3 is calculated.

[0066] In this embodiment, the thermal expansion coefficient data is a pre-stored material property library, containing the linear expansion coefficients of different materials under temperature changes. The shrinkage difference is the difference in shrinkage between valve seat 2 and valve plate 3 caused by the different thermal expansion coefficients of their materials due to temperature changes.

[0067] The required compensation stroke of the adjusting ring 12 is determined based on the difference in shrinkage.

[0068] In this embodiment, the required compensation stroke is the distance that the adjusting ring 12 needs to move axially to compensate for the difference in shrinkage.

[0069] Based on the historical compensation records of the regulating ring 12, the remaining limit compensation stroke is obtained.

[0070] In this embodiment, the remaining limit compensation stroke is the maximum distance that the adjusting ring 12 can still move axially without failure.

[0071] If the remaining limit compensation stroke is greater than or equal to the required compensation stroke, the target PWM control signal of the electric telescopic rod 17 is determined according to the conversion relationship between the compensation stroke of the regulating ring 12 and the telescopic stroke of the electric telescopic rod 17.

[0072] In this embodiment, the conversion relationship is the proportional coefficient (unit mm / mm) between the displacement of the adjusting ring 12 and the extension / retraction amount of the electric telescopic rod 17, which is determined by the mechanical structure and is used to map the compensation requirements to the actuator control.

[0073] The electric telescopic pole 17 is controlled to extend and retract accordingly based on the target PWM control signal output by the controller.

[0074] If the remaining limit compensation stroke is less than the required compensation stroke, a warning signal will be sent to the remote monitoring system through the audible and visual alarm device and the wireless communication module.

[0075] Among them, the temperature control compensation unit 4 obtains the remaining limit compensation stroke based on the historical compensation records of the regulating ring 12, including: Calculate the radius difference between the adjusting ring 12 and the mounting ring 15.

[0076] In this embodiment, the radius difference is the result obtained by subtracting the radius of the mounting ring 15 from the radius of the adjusting ring 12.

[0077] Based on historical compensation records, the historical compensation stroke of regulating ring 12 is determined.

[0078] In this embodiment, the historical compensation record is log data stored in the controller, which records the travel value, time and environmental conditions of each compensation of the regulating loop 12.

[0079] A finite element model of the mounting ring 15 and the adjusting ring 12 is constructed. The finite element model includes the geometric parameters, material properties and boundary constraints of the mounting ring 15 and the adjusting ring 12.

[0080] In this embodiment, the finite element model is a computer simulation model that simulates the mechanical behavior between the mounting ring 15 and the adjusting ring 12. Geometric parameters are component dimensions (diameter, thickness, etc.) used to define the model shape. Material properties are elastic modulus, Poisson's ratio, etc., used to define the material response. Boundary constraints are fixed / degree-of-freedom settings used to simulate the actual installation state.

[0081] Based on the simulated boundary conditions, component distributed loads are applied to the finite element model to obtain the simulation results after loading is completed; the component distributed loads include the forces acting on each component within the mounting ring 15 and the adjusting ring 12, as well as the thermal stress caused by the temperature gradient.

[0082] In this embodiment, the boundary cases are defined as all scenarios from the point where the edge of the mounting ring 15 reaches the edge of the adjusting ring 12 to the point where both the mounting ring 15 and the adjusting ring 12 reach instability. Component distributed loads: the force / stress distribution applied to the model, simulating actual stress. The simulation results are output as displacement fields and stress contour maps by ANSYS.

[0083] The instability critical point is determined based on the simulation results, and the axial displacement of the adjusting ring 12 is obtained when the adjusting ring 12 and the mounting ring 15 have not reached the instability state, based on the boundary conditions associated with the instability critical point.

[0084] In this embodiment, the instability critical point is the critical state of structural failure (such as buckling or plastic deformation), defined by a stress / displacement threshold. The axial displacement is the axial displacement of the adjusting ring 12 during the process from the state where the edge of the mounting ring 15 reaches the edge of the adjusting ring 12 to the state where the mounting ring 15 and the adjusting ring 12 reach instability.

[0085] The remaining limit compensation stroke is determined based on the radius difference, historical compensation stroke, and axial displacement.

[0086] In this embodiment, the remaining limit compensation stroke is the result obtained by subtracting the historical compensation stroke from the sum of the radius difference and the axial displacement.

[0087] The working principle and beneficial effects of the above technical solution are as follows: The present invention calculates the shrinkage difference based on the temperature gradient distribution and thermal expansion coefficient database, and determines the required compensation stroke of the regulating ring 12 based on the shrinkage difference.

[0088] Because the regulating ring 12 has an effective compensation range, exceeding the compensation limit can easily damage the temperature compensation component. Therefore, when the required compensation stroke is calculated, the corresponding compensation is not executed immediately; instead, the remaining limit compensation stroke is calculated first. When the remaining limit compensation stroke is greater than or equal to the required compensation stroke, the target PWM control signal for the electric telescopic rod is determined based on the conversion relationship between the compensation stroke of the regulating ring 12 and the telescopic stroke of the electric telescopic rod 17. The controller then triggers the target PWM control signal to perform the corresponding stroke compensation. Otherwise, an early warning signal is sent to the remote monitoring system via an audible and visual alarm device and a wireless communication module to notify manual intervention in a timely manner.

[0089] Specifically, when calculating the remaining limit compensation stroke, the radius difference between the regulating ring 12 and the mounting ring 15 is calculated, and the historical compensation stroke of the regulating ring 12 is determined based on historical compensation records. A precise finite element model of the regulating ring 12 and the mounting ring 15 is established. Based on the simulated boundary conditions, distributed loads are applied to the components in the finite element model, and simulation results after loading are obtained. The instability critical point is calculated based on the simulation results, and the axial displacement of the regulating ring 12 is determined from the state where the edge of the mounting ring 15 reaches the edge of the regulating ring 12 to the state where the mounting ring 15 and the regulating ring 12 reach instability. Based on the radius difference, historical compensation stroke, and axial displacement, the remaining limit compensation stroke is determined. Finite element analysis identifies structural risks in advance, avoids sudden failures, and improves the reliability of temperature control compensation.

[0090] 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.

[0091] 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.

[0092] 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 flat plate valve with low-temperature detection function, characterized in that, include: The valve body (1) has a medium channel inside, and two valve seats (2) are movably arranged along the axial direction in the medium channel. A valve plate (3) is slidably arranged between the two valve seats (2). A low-temperature detection unit is installed on the valve body (1) to monitor the temperature inside the valve cavity in real time; The temperature control compensation unit (4) is slidably set on the valve body (1) and applies axial pressure to the valve seat (2). The temperature control compensation unit (4) and the low temperature detection unit are electrically connected to the controller and are used to adjust the clamping force between the valve plate (3) and the valve seat (2) according to the temperature change.

2. A flat plate valve with low-temperature detection function according to claim 1, characterized in that, The valve plate (3) is connected to the valve stem (5) at the top, and the valve stem (5) is connected to the handwheel drive mechanism (6) that drives its movement at the top.

3. A flat plate valve with low-temperature detection function according to claim 1, characterized in that, The temperature control compensation unit (4) includes: An annular groove (11) is coaxially formed on the valve body (1) and located on the side of the valve seat (2) away from the valve plate (3); The adjusting ring (12) is slidably disposed in the annular groove (11) and its end is pressed against the end face of the valve seat (2). The outer side of the adjusting ring (12) is set as a conical outer wall. An elastic element (13) is disposed between the end of the adjusting ring (12) and the annular groove (11) to maintain the clamping force of the adjusting ring (12) on the valve seat (2); A temperature compensation component is installed in an annular groove (11) to apply pressure to the conical surface of the regulating ring (12) at low temperatures so that the regulating ring (12) moves axially.

4. A flat plate valve with low-temperature detection function according to claim 3, characterized in that, The temperature compensation component includes a gap adjustment assembly, which includes: The mounting ring (15) is installed in the annular groove (11) and coaxially arranged on the outside of the adjusting ring (12). Multiple driving cavities are arranged in the mounting ring (15) along the circumferential direction. An electric telescopic rod (17) is installed in each drive chamber and electrically connected to the controller; The compensation drive component (18) is slidably disposed in the drive cavity. The outer side of the compensation drive component (18) is connected to the telescopic end of the electric telescopic rod (17). The inner side of the compensation drive component (18) is provided with a drive block (19). The drive block (19) slides and cooperates with the inner side of the mounting ring (15) and extends into the annular groove (11) to abut against the outer wall of the adjusting ring (12).

5. A flat plate valve with low-temperature detection function according to claim 4, characterized in that, The temperature compensation component also includes an antifreeze replenishment kit, which includes: Antifreeze replenishment ring (14) is sleeved on the outside of valve body (1) and has multiple outlets along the circumferential direction. The inlet of antifreeze replenishment ring (14) is connected to the antifreeze storage tank above valve body (1). A partition plate (21) is slidably disposed on the inner wall of the drive cavity and divides the drive cavity into an outer cavity (22) and an inner cavity (23). The outer cavity (22) is provided with a replenishment port (16) corresponding to the antifreeze replenishment ring (14). The inner cavity (23) is used to accommodate the compensation drive component (18). One end of the partition plate (21) is connected to the inner wall of the drive cavity by a spring, and the other end is sealed against the side of the electric telescopic rod (17). The extension and retraction of the electric telescopic rod (17) controls the sealing state between the compensation drive component (18) and the sealing structure, so as to realize the on-demand supply and automatic return of antifreeze.

6. A flat plate valve with low-temperature detection function according to claim 5, characterized in that, The antifreeze replenishment assembly also includes: a sealing member (24), which is disposed on the outer wall of the fixed end of the electric telescopic rod (17) and has a first channel (25) in the middle connecting the outer cavity (22) and the inner cavity (23); the end of the partition plate (21) is provided with an arc-shaped sealing groove (29) adapted to the end of the sealing member (24); the cross section of the sealing member (24) is set to be spherical, and the cross-sectional diameter of the arc-shaped sealing groove (29) is larger than the cross-sectional diameter of the sealing member (24); a liquid storage chamber (26) is provided inside the compensation drive member (18), and a second channel (27) connecting the liquid storage chamber (26) and the inner cavity (23) is provided on its outer side; the outer side of the compensation drive member (18) is set to match the curvature of the inner side of the partition plate (21).

7. A flat plate valve with low-temperature detection function according to claim 1, characterized in that, The low-temperature detection unit includes: A temperature sensor array is provided with multiple temperature sensors arranged along the circumference of the valve body (1) to collect temperature data at different locations within the valve cavity. The signal processing module, electrically connected to the temperature sensor array, is used to filter and digitize the collected temperature data to obtain the temperature inside the valve chamber.

8. A flat plate valve with low-temperature detection function according to claim 7, characterized in that, The signal processing module performs the following operations: Iterate through the temperature sensors in the temperature sensor array and obtain the setting position identifier of the temperature sensor being iterated; Based on the set location identifier and the construction conditions of the fusion sensing network, a local fusion sensing network is constructed for the target location corresponding to the set location identifier; Based on the temperature sensing path of each network node in the local fusion sensing network to the target location, the path feature set of the temperature sensing path is extracted. Based on the path feature set of the temperature sensing path, determine the sensing result correction strategy with the highest matching degree in the sensing result correction strategy library; The temperature sensing results of the corresponding temperature sensing path are corrected based on the sensing result correction strategy to obtain the correction result; Calculate the deviation between the correction results for each network node; If the deviation is greater than the preset deviation threshold, the corresponding network nodes are removed in order of increasing matching degree based on the correction result and the corresponding perception result correction strategy, until the deviation between the correction results of the network nodes falls within the preset deviation range. The average value of the correction result of the current network node and the detection value of the temperature sensor being traversed is obtained and used as the temperature data of the target location. Once all temperature sensors in the temperature sensor array have been traversed, the temperature inside the valve chamber is obtained.

9. A flat plate valve with low-temperature detection function according to claim 6, characterized in that, The temperature control compensation unit (4) also performs the following operations: Calculate the temperature gradient distribution within the valve cavity based on the real-time monitored temperature. Based on the temperature gradient distribution and thermal expansion coefficient database, the difference in shrinkage between valve seat (2) and valve plate (3) is calculated; Based on the difference in shrinkage, determine the required compensation stroke of the adjusting ring (12); Based on the historical compensation records of the regulating ring (12), obtain the remaining limit compensation stroke; If the remaining limit compensation stroke is greater than or equal to the required compensation stroke, the target PWM control signal of the electric telescopic rod (17) is determined according to the conversion relationship between the compensation stroke of the regulating ring (12) and the telescopic stroke of the electric telescopic rod (17); The electric telescopic pole (17) is controlled to extend and retract accordingly based on the target PWM control signal output by the controller; If the remaining limit compensation stroke is less than the required compensation stroke, a warning signal will be sent to the remote monitoring system through the audible and visual alarm device and the wireless communication module.

10. A flat plate valve with low-temperature detection function according to claim 9, characterized in that, The temperature control compensation unit (4) obtains the remaining limit compensation stroke based on the historical compensation records of the regulating ring (12), including: Calculate the radius difference between the adjusting ring (12) and the mounting ring (15); Based on historical compensation records, determine the historical compensation stroke of the regulating ring (12); Construct finite element models of mounting ring (15) and adjusting ring (12), the finite element models including the geometric parameters, material properties and boundary constraints of mounting ring (15) and adjusting ring (12); Based on the simulated boundary conditions, component distributed loads are loaded in the finite element model to obtain the simulation results after loading is completed; the component distributed loads include the forces of each component in the mounting ring (15) and the adjusting ring (12) as well as the thermal stress caused by the temperature gradient; The instability critical point is determined based on the simulation results, and the axial displacement of the regulating ring (12) is obtained when the regulating ring (12) and the mounting ring (15) have not reached the instability state based on the boundary conditions associated with the instability critical point. The remaining limit compensation stroke is determined based on the radius difference, historical compensation stroke, and axial displacement.

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