Differential temperature and pressure intelligent control valve

Abstract

This utility model discloses an intelligent temperature and pressure differential control valve, including a valve body, an intelligent controller, a supply water temperature sensor, a return water temperature sensor, a supply water pressure sensor, and a return water pressure sensor. The supply and return water temperature sensors are installed on the supply and return water pipes respectively to monitor temperature changes in real time. The supply water pressure sensor is installed at the inlet of the supply water pipe, and the return water pressure sensor is installed at the outlet of the return water pipe, enabling bidirectional pressure monitoring. The intelligent controller connects to the four sensors via the RS-485 communication protocol and uses a PID control algorithm to process and analyze the collected data. When the system detects that the temperature or pressure difference exceeds the set range, the controller automatically calculates the optimal valve opening and sends a control command to drive the regulating mechanism within the valve body to change the flow cross-sectional area. This control valve has an automatic switching function between temperature and pressure regulation modes, significantly improving control accuracy and system stability compared to traditional single-parameter control valves, and effectively reducing energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of control valve technology, and in particular to an intelligent control valve for temperature difference and pressure difference. Background Technology

[0002] With the continuous improvement of modern industrial automation, fluid control in fields such as central air conditioning systems, heating systems, and heat exchange systems places higher demands on the precision and intelligence of pipeline flow regulation equipment. Traditional manual regulating valves and simple electric regulating valves are no longer sufficient to meet the needs of modern industrial systems for precise control of fluid parameters. In complex industrial environments, fluid temperature and pressure often interact, and controlling only a single parameter can easily lead to system instability, increased energy consumption, and even affect the safety and reliability of the entire system. Therefore, developing intelligent regulating valves capable of simultaneously monitoring and controlling multiple key parameters has become an inevitable trend in the industry.

[0003] Currently, fluid control valves on the market suffer from the following technical shortcomings: First, most products can only control a single parameter, such as temperature or pressure, failing to meet the demands of multi-parameter coordinated adjustment under complex operating conditions. Second, sensor configurations are inadequate, typically with detection points set at only a single location, lacking synchronous monitoring of both supply and return water parameters, resulting in low control accuracy. Third, control algorithms are relatively simple, often employing on / off or simple proportional control, making precise continuous adjustment difficult, with slow response times and a tendency to overshoot. These technical limitations severely restrict the improvement of the overall performance of fluid control systems, especially in applications requiring high precision in temperature and pressure control.

[0004] To address the aforementioned technical challenges, the industry urgently needs to develop a new type of regulating valve capable of simultaneously achieving intelligent control of both temperature and pressure. This device should be equipped with multi-point sensor configurations to monitor real-time changes in the temperature and pressure of the supply and return water; employ advanced control algorithms to achieve coordinated optimization control of multiple parameters; and possess strong system integration capabilities and communication functions for easy networking with a host computer system. Through technological innovation, not only can the accuracy and stability of fluid control be significantly improved, but system energy consumption can also be effectively reduced, overall operating efficiency enhanced, and the technological demands of modern industrial automation development met. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an intelligent temperature and pressure difference control valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A temperature and pressure differential intelligent control valve includes a valve body, an intelligent controller, a supply water temperature sensor, a return water temperature sensor, a supply water pressure sensor, and a return water pressure sensor. The valve body is connected to media pipelines at both ends, and the valve body is equipped with a valve stem and a valve disc adjustment mechanism that can move up and down. The supply water temperature sensor is installed on the supply water pipeline, and the return water temperature sensor is installed on the return water pipeline. The supply water pressure sensor is installed at the inlet of the supply water pipeline, and the return water pressure sensor is installed at the outlet of the return water pipeline. The intelligent controller is electrically connected to the supply water temperature sensor, the return water temperature sensor, the supply water pressure sensor, and the return water pressure sensor via the 485 communication protocol, and is also electrically connected to the drive mechanism of the valve body.

[0008] Furthermore, the valve body is made of brass or ductile iron, the valve cover is a 1Cr18Ni9+NBR composite structure, and the valve stem is made of 1Cr18Ni9 stainless steel.

[0009] Furthermore, the intelligent controller has a built-in PID control algorithm that can automatically adjust the valve opening based on feedback signals from temperature and pressure sensors.

[0010] Furthermore, the valve body packing adopts a combination of polytetrafluoroethylene and NBR sealing structure to ensure the system's sealing performance.

[0011] Furthermore, the intelligent controller has temperature regulation mode and pressure regulation mode, and can automatically switch control modes according to the detected parameters.

[0012] Furthermore, the control valve is suitable for pipe diameters ranging from DN25 to DN400, with a working pressure of 1.6 MPa and a medium temperature range of 2-90℃.

[0013] The beneficial effects of this utility model are as follows:

[0014] This invention achieves simultaneous monitoring of four key system parameters by installing temperature and pressure sensors on the supply and return water pipelines respectively. Combined with the PID algorithm of the intelligent controller, it can automatically switch between temperature and pressure regulation modes according to actual operating conditions, realizing multi-parameter collaborative optimization control. Compared with traditional single-parameter control valves, this technical solution significantly improves the accuracy and response speed of fluid control, effectively solves the problem of unstable control of supply and return water temperature and pressure differences, reduces system energy consumption, and improves the overall operating efficiency and stability of fluid control systems such as central air conditioning and heating systems, meeting the technical requirements of modern industrial automation for precise fluid control.

[0015] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a temperature difference and pressure difference intelligent control valve proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the control system workflow of an intelligent temperature and pressure control valve proposed in this utility model.

[0018] In the diagram: 1. Supply water temperature sensor; 2. Return water temperature sensor; 3. Return water pressure sensor; 4. Supply water pressure sensor; 5. Valve body; 6. Intelligent controller. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Example 1, referring to Figures 1 to 2

[0021] This intelligent control system adopts an integrated design, with supply water temperature sensor 1 and return water temperature sensor 2 installed at appropriate locations in the supply and return water pipes, respectively, for real-time monitoring of supply and return water temperature changes. Supply water pressure sensor 4 is installed at the inlet of the supply water pipe, and return water pressure sensor 3 is installed at the outlet of the return water pipe, achieving dual monitoring of system pressure. The intelligent controller 6, as the core control unit of the entire system, establishes data connections with each sensor via the 485 communication protocol, enabling real-time acquisition and processing of temperature and pressure signals.

[0022] The valve body 5 is made of brass or ductile iron, the valve cover is a 1Cr18Ni9+NBR composite structure, the valve stem is made of 1Cr18Ni9 stainless steel, and the packing uses a combination of PTFE and NBR seals to ensure the system's sealing performance and service life. An internal precision adjustment mechanism is installed in the valve body, which drives the valve stem up and down via commands from the intelligent controller to achieve precise flow control. The control system uses a PID algorithm; based on the set temperature and pressure parameters, the intelligent controller compares the deviation between the actual detected values ​​and the target values ​​in real time, automatically adjusting the valve opening to maintain stable system operation.

[0023] In practical applications, when the supply water temperature sensor 1 and return water temperature sensor 2 detect a temperature difference exceeding the set range, the intelligent controller 6 immediately activates the temperature regulation mode, controlling the temperature difference by adjusting the valve opening to change the flow rate. Simultaneously, the supply water pressure probe 4 and return water pressure probe 3 continuously monitor the system pressure status. When the pressure difference is abnormal, the controller automatically switches to the pressure regulation mode to ensure system pressure balance. This control valve is suitable for pipe diameters ranging from DN25 to DN400, with a flow coefficient Kv value from 10 to 960 m³ / h. 3 With a capacity of 1.6 MPa and a working pressure of 1.6 MPa, and a medium temperature of 2-90℃, it can meet the precise control requirements of various industrial applications such as central air conditioning systems, heating systems, and heat exchange systems.

[0024] Working principle:

[0025] The working principle of this temperature and pressure differential intelligent control valve is based on a closed-loop feedback control system, which achieves precise control of pipeline fluid through multi-parameter collaborative monitoring and intelligent adjustment.

[0026] Supply water temperature sensor 1 and return water temperature sensor 2 continuously monitor the temperature changes in the supply and return water pipes, converting the temperature signals into standard electrical signals. Simultaneously, supply water pressure sensor 4 and return water pressure sensor 3 detect the pressure at the inlet of the supply water pipe and the outlet of the return water pipe, respectively, enabling real-time monitoring of the system pressure. All sensors transmit the collected data to the intelligent controller 6 via the RS-485 communication protocol, ensuring the stability and accuracy of signal transmission.

[0027] After receiving signals from four sensors, the intelligent controller 6 analyzes and processes the data using a built-in PID control algorithm. The controller compares the actual detected values ​​with preset target parameters, calculating the deviations in temperature and pressure differences. When the system detects that the supply and return water temperature difference exceeds the set range, the controller automatically activates the temperature regulation mode, determining the optimal valve opening adjustment amount through precise calculation. When the pressure sensor detects an abnormal supply and return water pressure difference, the system switches to pressure regulation mode, prioritizing system pressure balance.

[0028] Based on the calculation results of the control algorithm, the intelligent controller 6 sends control commands to the drive mechanism of the valve body 5. After receiving the commands, the drive mechanism precisely controls the up and down movement of the valve stem, thereby changing the flow area between the valve disc and the valve seat. By adjusting the size of the flow cross-sectional area, precise control of the pipeline flow rate is achieved, ultimately reaching the purpose of regulating temperature and pressure.

[0029] This control system possesses adaptive adjustment capabilities, automatically optimizing the control strategy based on changes in actual operating conditions. When the system operates in a steady state, the controller maintains the current valve opening to ensure parameter stability. When external conditions change, causing temperature or pressure fluctuations, the control system responds immediately, using continuous feedback adjustment to keep system parameters within the set range, achieving intelligent and precise control of fluid parameters in applications such as central air conditioning systems and heating systems.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A temperature difference and pressure difference intelligent control valve, characterized in that, The system includes a valve body (5), an intelligent controller (6), a water supply temperature sensor (1), a return water temperature sensor (2), a water supply pressure sensor (4), and a return water pressure sensor (3). The valve body (5) is connected to the medium pipeline at both ends. The valve body (5) is equipped with a valve stem and a valve disc adjustment mechanism that can move up and down. The water supply temperature sensor (1) is installed on the water supply pipeline, and the return water temperature sensor (2) is installed on the return water pipeline. The water supply pressure sensor (4) is installed at the inlet of the water supply pipeline, and the return water pressure sensor (3) is installed at the outlet of the return water pipeline. The intelligent controller (6) is electrically connected to the water supply temperature sensor (1), the return water temperature sensor (2), the water supply pressure sensor (4), and the return water pressure sensor (3) respectively via the 485 communication protocol, and is also electrically connected to the drive mechanism of the valve body (5).

2. The temperature difference and pressure difference intelligent control valve according to claim 1, characterized in that, The valve body (5) is made of brass or ductile iron, the valve cover is a 1Cr18Ni9+NBR composite structure, and the valve stem is made of 1Cr18Ni9 stainless steel.

3. The intelligent control valve for temperature and pressure difference according to claim 1, characterized in that, The intelligent controller (6) has a built-in PID control algorithm, which can automatically adjust the valve opening based on the feedback signals from the temperature sensor and the pressure sensor.

4. The intelligent control valve for temperature and pressure difference according to claim 1, characterized in that, The packing of the valve body (5) adopts a combination of polytetrafluoroethylene and NBR sealing structure to ensure the sealing performance of the system.

5. The intelligent control valve for temperature and pressure difference according to claim 1, characterized in that, The intelligent controller (6) has a temperature regulation mode and a pressure regulation mode, and can automatically switch the control mode according to the detection parameters.

6. The intelligent control valve for temperature and pressure difference according to claim 1, characterized in that, The control valve is suitable for pipe diameters ranging from DN25 to DN400, with a working pressure of 1.6 MPa and a medium temperature range of 2-90℃.

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