Cooling water adjusting device of refrigeration compressor

Abstract

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration compressor cooling water adjusting device which comprises temperature sensors arranged on a cooling water outlet and a cooling water inlet of a refrigeration unit and / or a water inlet pipeline and a water outlet pipeline of a cooling water system and used for detecting the temperature of cooling water and outputting analog quantity signals. The cooling water outlet is connected with a water inlet pipeline, and the cooling water inlet is connected with a water outlet pipeline; the field controller is electrically connected with the temperature sensor and receives the analog quantity signal; the electric actuator is connected with the field controller and used for receiving the control signal; the three-way flange valve seat mechanism is installed on a water inlet pipeline of the cooling water system and connected with the upstream and the downstream of the water inlet pipeline and a water outlet pipeline, the electric actuator is controlled by the field controller to drive the three-way flange valve seat mechanism to adjust water flow in a loop, and the cooling water outlet temperature of the refrigerating unit is adjusted.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a refrigeration compressor cooling water regulating device. Background Technology

[0002] In refrigeration systems, the same cooling water system typically needs to provide cooling water for both the cold-end compressor unit and the refrigeration unit. For the cold-end compressor unit, the lower the cooling water temperature, the better. Therefore, cooling towers are often used to lower the water temperature during hot weather, and the equipment can still be used without the cooling towers operating during cold weather. This results in the cooling water temperature varying with the seasons and ambient temperature.

[0003] The requirements for cooling water temperature in refrigeration units are different. It's not a case of the colder the better; rather, it needs to be kept stable within a certain range and cannot be too low. This is because excessively low cooling water temperature will reduce the exhaust pressure of the refrigeration unit, thereby reducing heat exchange efficiency. This will prevent the pressure in the compressed process tank from decreasing or decreases too slowly, seriously affecting production. Summary of the Invention

[0004] This invention provides a cooling water regulating device for a refrigeration compressor, which solves the problem of the difference in cooling water temperature requirements between the cold-end compressor unit and the refrigeration unit in the same cooling water system, and the resulting abnormal operation of the refrigeration compressor unit. It can stabilize the cooling water temperature of the refrigeration unit under different seasons and ambient temperature changes, and ensure the normal operation of the refrigeration compressor unit.

[0005] This invention provides a cooling water regulating device for a refrigeration compressor, comprising: a temperature sensor disposed on the cooling water outlet and inlet of the refrigeration unit and / or on the inlet and outlet pipes of the cooling water system, for detecting the cooling water temperature and outputting an analog signal; the cooling water outlet being connected to the inlet pipe and the cooling water inlet being connected to the outlet pipe; a field controller electrically connected to the temperature sensor and receiving the analog signal; an electric actuator connected to the field controller and receiving a control signal; and a three-way flange valve seat mechanism installed on the inlet pipe of the cooling water system and connected to the upstream, downstream, and outlet pipes of the inlet pipe, respectively; the electric actuator, under the control of the field controller, drives the three-way flange valve seat mechanism to regulate the water flow in the regulating circuit, thereby regulating the cooling water outlet temperature of the refrigeration unit.

[0006] According to one embodiment of the present invention, the field controller is a PLC; after receiving the analog signal from the temperature sensor, the PLC calculates the deviation between the actual temperature and the set temperature, and generates a control signal based on the PID control algorithm to drive the electric actuator to operate.

[0007] According to one embodiment of the present invention, a display module is further included, which is connected to the field controller and is used to display PID adjustment parameters in real time; the PID adjustment parameters include proportional coefficient P, integral coefficient I, derivative coefficient D, dead zone, set temperature value, actual temperature value, and valve opening value.

[0008] According to one embodiment of the present invention, the temperature sensor is a high-precision sensor with a measurement accuracy of ±0.1℃.

[0009] According to one embodiment of the present invention, the electric actuator is an intelligent electric actuator with a fault self-diagnosis function; the electric actuator is provided with a remote communication interface to realize remote control.

[0010] According to one embodiment of the present invention, it further includes a shutdown state control module; when the main refrigeration unit of the refrigeration unit is in a shutdown state, the shutdown state control module controls the field controller to operate in manual mode, and at this time the valve opening of the three-way flange valve seat mechanism is fixed at 25%.

[0011] According to one embodiment of the present invention, a start-up timing and control module is also included; when the main chiller of the chiller unit is started, the start-up timing and control module starts timing, and when the timing reaches 5 minutes, the field controller is controlled to operate in automatic mode, and the valve opening of the three-way flange valve seat mechanism is automatically adjusted according to the difference between the set temperature value and the actual temperature value of the cooling water outlet of the chiller unit; the valve opening adjustment range is 5%-95%.

[0012] According to one embodiment of the present invention, a pressure detection and temperature setting adjustment module is further included, which is capable of detecting the exhaust pressure of the main refrigeration unit; when the exhaust pressure of the main refrigeration unit is higher than 1200 kPa, the set temperature value is reduced; when the exhaust pressure of the main refrigeration unit is lower than 1000 kPa, the set temperature value is increased.

[0013] According to one embodiment of the present invention, a manual intervention module is also included; when the actual temperature value of the cooling water outlet of the refrigeration unit deviates from the set temperature value for a long time, the manual intervention module is manually operated to input a valve opening command to the field controller so that the actual temperature value is restored to the set temperature value.

[0014] According to one embodiment of the present invention, the three-way flange valve seat mechanism includes a valve structure made of a corrosion-resistant material, wherein the corrosion-resistant material is 316L stainless steel.

[0015] The refrigeration compressor cooling water regulating device provided by this invention uses temperature sensors installed at the cooling water outlet and inlet of the refrigeration unit and / or on the inlet and outlet pipes of the cooling water system. These sensors can detect the cooling water temperature in real time and output analog signals. A field controller is electrically connected to the temperature sensor. After receiving the analog signal, it analyzes and processes the signal based on the refrigeration unit's requirement for a stable cooling water temperature within a certain range. Subsequently, the field controller sends a control signal to an electric actuator. Driven by this control signal, the electric actuator actuates a three-way flange valve seat mechanism installed on the inlet pipe of the cooling water system. The three-way flange valve seat mechanism is connected to the upstream, downstream, and outlet pipes of the inlet pipe. By adjusting its opening, the water flow in the loop can be precisely controlled, thereby regulating the temperature and flow rate of the cooling water entering the refrigeration unit. This ensures that the cooling water outlet temperature of the refrigeration unit is stabilized within a suitable range, avoiding problems such as reduced exhaust pressure and decreased heat exchange efficiency caused by excessively low cooling water temperature. It effectively solves the problem of differences in cooling water temperature requirements between the cold-end compressor unit and the refrigeration unit within the same cooling water system, and the resulting abnormal operation of the refrigeration compressor unit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the cooling water regulating device for a refrigeration compressor provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the cooling water regulating device and cooling water system for the refrigeration compressor provided by the present invention.

[0019] Figure 3 This is one of the schematic diagrams of the control interface of the display module of the refrigeration compressor cooling water regulating device provided by the present invention.

[0020] Figure 4 This is the second schematic diagram of the control interface of the display module of the refrigeration compressor cooling water regulating device provided by the present invention.

[0021] Figure label: 10. Refrigeration unit; 11. Temperature sensor; 12. Field controller; 13. Electric actuator; 14. Three-way flange valve seat mechanism; 21. Inlet water pipe; 22. Outlet water pipe; 23. Water tower; 24. Water tank; 25. Liquid level sensor; 26. Water pump. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not 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 the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0024] The following is combined Figures 1 to 4 This invention describes a specific embodiment of the refrigeration compressor cooling water regulating device.

[0025] like Figure 1 and Figure 2 As shown, the present invention provides a cooling water regulating device for a refrigeration compressor, comprising: a temperature sensor 11, disposed on the cooling water outlet and cooling water inlet of the refrigeration unit 10 and / or the inlet pipe 21 and outlet pipe 22 of the cooling water system, for detecting the cooling water temperature and outputting an analog signal; the cooling water outlet is connected to the inlet pipe 21 and the cooling water inlet is connected to the outlet pipe 22; a field controller 12, electrically connected to the temperature sensor 11, for receiving the analog signal; an electric actuator 13, connected to the field controller 12, for receiving a control signal; and a three-way flange valve seat mechanism 14, installed on the inlet pipe 21 of the cooling water system and connected to the upstream and downstream of the inlet pipe 21 and the outlet pipe 22, respectively; the electric actuator 13, under the control of the field controller 12, drives the three-way flange valve seat mechanism 14 to regulate the water flow in the circuit, thereby regulating the cooling water outlet temperature of the refrigeration unit 10.

[0026] Specifically, temperature sensor 11, as the sensing component of the entire regulating device, is installed at the cooling water inlet and outlet of the chiller unit 10, directly monitoring the temperature of the cooling water entering and exiting the chiller unit 10. Installed on the inlet pipe 21 and outlet pipe 22 of the cooling water system, it can monitor the water temperature of the entire cooling water system. The detected cooling water temperature is converted into an analog signal, accurately reflecting the actual water temperature value. The field controller 12 is closely connected to temperature sensor 11. Upon receiving the analog signal, it compares and analyzes it with the pre-set stable water temperature range required by the chiller unit 10. Electric actuator 13 operates according to the control signal output by field controller 12. The three-way flange valve seat mechanism 14 is installed on the cooling water system inlet pipe 21 and connects the upstream and downstream of the inlet pipe 21 to the outlet pipe 22. When driven by electric actuator 13, it can flexibly adjust the water flow within the circuit. For example, when the cooling water temperature of the refrigeration unit 10 is detected to be too high, the flow rate of cooling water from the low-temperature source can be increased by adjusting the three-way flange valve seat mechanism 14; conversely, when the temperature is too low, the flow rate of low-temperature cooling water is reduced, thereby achieving precise adjustment of the cooling water outlet temperature of the refrigeration unit 10.

[0027] In a preferred embodiment of the refrigeration compressor cooling water regulating device according to the present invention, the temperature sensor 11 is a high-precision sensor with a measurement accuracy of ±0.1℃. Specifically, the high-precision temperature sensor 11 is precisely installed at key measurement points of the refrigeration compressor cooling water, such as the inlet and outlet positions of the cooling water, to ensure accurate measurement of the real-time temperature of the cooling water. Because its measurement accuracy can reach ±0.1℃, it can extremely sensitively detect subtle changes in the cooling water temperature, providing a solid data foundation for subsequent control and regulation. Based on the accurate data fed back by the temperature sensor 11, the PLC can more accurately calculate the deviation between the actual temperature and the set temperature after receiving the analog signal.

[0028] In applications where the same cooling water system simultaneously supplies cooling water to both the cold-end compressor unit and the refrigeration unit 10, the cold-end compressor unit requires low-temperature cooling water. Typically, the system adjusts the water temperature using methods such as cooling towers based on seasonal changes, leading to significant temperature fluctuations with ambient temperature. The refrigeration unit 10, however, requires cooling water at a stable temperature; excessive temperature fluctuations can cause malfunctions. The temperature sensor 11 of this regulating device monitors the cooling water temperature in real time and transmits the signal to the field controller 12. The field controller 12 analyzes the received signal based on a preset suitable water temperature range for the refrigeration unit 10. If the ambient temperature rises, causing the cooling water temperature to increase, the field controller 12 sends a command to the electric actuator 13. The electric actuator 13 drives the three-way flange valve seat mechanism 14 to increase the water flow in the path connected to the low-temperature source, allowing more low-temperature cooling water to enter the refrigeration unit 10, thereby lowering the cooling water temperature of the refrigeration unit 10. If the ambient temperature decreases, causing the cooling water temperature to drop, the field controller 12 instructs the electric actuator 13 to adjust the three-way flange valve seat mechanism 14 to reduce the low-temperature cooling water flow and maintain a stable cooling water temperature for the refrigeration unit 10. Through such precise temperature control and flow regulation, this device can simultaneously meet the low-temperature cooling water requirements of the cold-end compressor unit and the stable-temperature cooling water requirements of the refrigeration unit 10 within the same cooling water system, improving the operational stability and reliability of the entire refrigeration system. It effectively copes with large fluctuations in ambient temperature, stabilizes the cooling water temperature, avoids abnormal operation of the refrigeration compressor unit due to water temperature fluctuations, reduces the impact on production, and ensures the continuity and stability of production.

[0029] Furthermore, the aforementioned refrigeration compressor cooling water regulating device can be equipped with an intelligent early warning system. When the water temperature detected by the temperature sensor 11 exceeds the set safety range, or when the field controller 12 detects abnormalities in the regulating action of the electric actuator 13 and the three-way flange valve seat mechanism 14, the intelligent early warning system will immediately issue an alarm to remind staff to handle the situation promptly. Simultaneously, remote monitoring functionality can be added, transmitting the device's operating data to the monitoring center in real time via a network. Staff can view the device's operating status and perform remote operation and parameter adjustments from anywhere using terminal devices. Additionally, to improve energy efficiency, an energy recovery module can be added to the device to recover and utilize excess heat generated during the cooling water regulation process for use in other processes requiring heat energy, achieving energy conservation and emission reduction.

[0030] like Figure 2The diagram illustrates the principle of combining a refrigeration compressor cooling water regulating device with a cooling water system according to a preferred embodiment of this application. In this system, the main refrigeration unit 10 and its auxiliary unit are connected in parallel, and temperature sensors 11 are installed at the inlet and outlet of the main refrigeration unit to monitor the temperature. A three-way flange valve seat mechanism 14 is located on the outlet side of the refrigeration unit 10, and its downstream is connected to a water tower 23 of the cooling water system. The cooling water system can be equipped with one water tower 23, or at least two water towers 23 connected in parallel. A temperature sensor 11 is installed upstream of the parallel water towers 23 to detect the inlet temperature of the water towers 23. A water tank 24 is connected downstream of the water towers 23. To detect the return water temperature of the cooling water tank 24, a temperature sensor 11 is preferably also installed at the inlet of the water tank 24. The water tank 24 is also connected to a liquid level detection device to measure the liquid level within the water tank 24; simultaneously, the water tank 24 is connected to a water inlet, allowing cooling water to be replenished from an external water source when needed. A water pump 26 is installed downstream of the water tank 24. The water pump 26 includes a main pump and an auxiliary pump, which are connected in parallel. The auxiliary pump is activated when necessary. The downstream of the water pump 26 continues to the refrigeration unit 10, thus forming a complete circulation loop.

[0031] According to a refrigeration compressor cooling water regulating device of the present invention, the field controller 12 is a PLC. After receiving the analog signal from the temperature sensor 11, the PLC calculates the deviation between the actual temperature and the set temperature, and generates a control signal based on a PID regulation algorithm to drive the electric actuator 13. Specifically, the electric actuator 13 is connected to a three-way valve. When the actual temperature is higher than the set temperature, the PLC calculates according to the PID algorithm that the cooling water flow needs to be increased to lower the temperature, and then drives the electric actuator 13 to increase the opening of the three-way valve, allowing more low-temperature cooling water to enter the refrigeration compressor and remove excess heat. Conversely, when the actual temperature is lower than the set temperature, the PLC controls the electric actuator 13 to decrease the opening of the three-way valve, reducing the flow of low-temperature cooling water and maintaining the appropriate operating temperature of the refrigeration compressor. Through such automated PID regulation, the opening of the three-way valve can be automatically adjusted according to the difference between the actual temperature and the set temperature to achieve constant outlet water temperature control, reducing manual intervention and improving control accuracy and efficiency. At the same time, a manual intervention method is also provided in case of abnormal conditions, facilitating timely adjustments by operators. For example, when a temperature sensor 11 malfunctions, causing a deviation in automatic adjustment, or in other special circumstances, the operator can directly adjust the opening of the three-way valve through the control panel or other manual control devices to ensure the stable operation of the refrigeration compressor cooling water system.

[0032] like Figure 3 and Figure 4As shown, a refrigeration compressor cooling water regulating device according to the present invention further includes a display module connected to the field controller 12 for real-time display of PID regulating parameters. The PID regulating parameters include proportional coefficient P, integral coefficient I, derivative coefficient D, dead zone, set temperature value, actual temperature value, and valve opening value. The display module presents these PID regulating parameters to the operator in an intuitive manner, such as through a liquid crystal display (LCD) or touch screen. The real-time display of these PID regulating parameters provides the operator with comprehensive and intuitive system operation information, facilitating monitoring, debugging, and optimization of the refrigeration compressor cooling water regulating device, and ensuring stable and efficient system operation.

[0033] Specifically, the proportional gain (P), integral gain (I), and derivative gain (D) are the core parameters of the PID control algorithm, and the display module allows operators to see their current setpoints at any time. These parameters directly affect the system's regulation performance. For example, the proportional gain (P) determines the proportional relationship between the controller output and the deviation; a larger P value makes the system respond more quickly to deviations, but may cause system oscillations. The integral gain (I) is used to eliminate the system's steady-state error, and its magnitude determines the strength of the integral action. The derivative gain (D) reflects the trend of deviation changes, helping to predict and suppress system changes in advance, thus improving system stability. By displaying these parameters, operators can make reasonable adjustments based on actual operating conditions to optimize the system's control effect.

[0034] The dead zone display is also crucial, as it sets an allowable temperature deviation range. Within this range, the system will not make adjustments, avoiding frequent adjustments to the three-way valve due to minor temperature fluctuations, thus reducing valve wear and energy consumption. Operators can flexibly adjust this parameter based on the characteristics of the refrigeration compressor and actual needs, combined with the displayed dead zone value.

[0035] The real-time display of the set and actual temperature values ​​allows operators to clearly see the target and current actual temperatures of the refrigeration compressor's cooling water. This helps operators determine if the system is operating normally; if the actual temperature deviates significantly from the set temperature, they can promptly check for system malfunctions or optimize the PID parameters.

[0036] The valve opening value display provides operators with information about the current operating status of the three-way valve. By observing changes in the valve opening, operators can intuitively understand how the system adjusts the cooling water flow to maintain the set temperature. If the valve opening is abnormal, such as remaining fully open or fully closed, it may indicate a problem with the system, allowing operators to troubleshoot and resolve the issue.

[0037] According to the present invention, a cooling water regulating device for a refrigeration compressor includes an intelligent electric actuator 13 with a self-diagnostic function. During equipment operation, the electric actuator 13 continuously monitors its key components, such as the motor, transmission mechanism, and control circuit, in real time. By analyzing parameters such as current, voltage, temperature, and operating status of these components, the self-diagnostic system responds quickly to any detected abnormalities, such as motor overload, short circuit, or transmission component jamming. Preferably, the self-diagnostic system not only accurately determines the fault type but also records detailed information such as the time of fault occurrence and relevant parameters. Through an internal alarm mechanism, it sends alarm signals to the field controller 12 or operators, facilitating timely troubleshooting and repair, effectively reducing system downtime caused by electric actuator 13 malfunctions, and ensuring the stable operation of the refrigeration compressor cooling water regulating device.

[0038] The electric actuator 13 can also be equipped with a remote communication interface for remote control. Preferably, this remote communication interface supports common communication protocols such as Modbus and Profibus, enabling seamless connection with a host computer monitoring system or remote terminal equipment. Operators at a remote monitoring center can remotely operate the electric actuator 13 using monitoring software or a dedicated control terminal. For example, when adjusting the cooling water flow of the refrigeration compressor, operators do not need to be on-site; they can directly input commands on the remote terminal to control the electric actuator 13, achieving remote adjustment of the three-way valve opening. Furthermore, the remote communication interface allows real-time acquisition of the electric actuator 13's operating status information, including the current valve opening, motor speed, and fault alarm information, facilitating comprehensive equipment operation monitoring and timely decision-making by operators.

[0039] According to the present invention, a refrigeration compressor cooling water regulating device further includes a shutdown state control module. When the main refrigeration unit 10 is in a shutdown state, the shutdown state control module controls the field controller 12 to operate in manual mode, and at this time, the valve opening of the three-way flange valve seat mechanism 14 is fixed at 25%. Specifically, when the main refrigeration unit 10 stops running, the shutdown state control module immediately receives a shutdown signal and quickly transmits this signal to the field controller 12. After receiving the instruction from the shutdown state control module, the field controller 12 switches its operating mode to manual mode. In manual mode, the operator can perform more targeted operations on the device, but the valve opening is preferably limited to a specific value, that is, the valve opening of the three-way flange valve seat mechanism 14 is fixed at 25%.

[0040] Even after the refrigeration compressor stops generating a large amount of heat, it still requires a certain amount of cooling water to maintain a stable temperature and prevent damage from localized overheating. A 25% valve opening ensures a suitable amount of cooling water flows slowly through the compressor, carrying away residual heat and providing some cooling. On the other hand, the 25% valve opening prevents excessive cooling water flow, avoiding water waste and potential problems caused by over-cooling, such as condensation buildup and component corrosion.

[0041] In this state, although the valve opening is fixed, the operator can still monitor the operation of the entire cooling water regulating device manually. For example, the temperature data fed back by temperature sensor 11 can be monitored to ensure that the temperature of the refrigeration compressor is within the normal range. If abnormal temperature changes are detected, the operator can take further measures according to the actual situation, such as manually fine-tuning the speed of cooling water pump 26, or checking for blockages in the cooling water pipeline. At the same time, the shutdown status control module also enhances the safety and reliability of the entire device, ensuring that the cooling water regulating device can still operate according to preset rules under the special condition of main refrigeration unit shutdown, reducing the risk of equipment damage due to improper shutdown operation or system failure, and providing strong support for the restart and stable operation of refrigeration unit 10.

[0042] According to the present invention, a refrigeration compressor cooling water regulating device further includes a start-up timing and control module; when the main refrigeration unit 10 starts, the start-up timing and control module starts timing, and when the timing reaches 5 minutes, the control field controller 12 is set to automatic mode, and the valve opening of the three-way flange valve seat mechanism 14 is automatically adjusted according to the difference between the set temperature value and the actual temperature value of the cooling water outlet of the refrigeration unit 10; the valve opening adjustment range is 5%-95%.

[0043] Specifically, the startup timing and control module immediately detects the startup signal and begins timing the moment the main chiller of the chiller unit 10 starts. During this 5-minute timing period, the system is in a relatively stable startup transition phase. The main chiller gradually begins to operate, and various components gradually enter their working state. However, the cooling water regulating device has not yet entered automatic regulation mode. This is because in the initial startup phase, the chiller's operating conditions are not yet stable, and temperature changes are relatively complex. Entering automatic regulation too early may lead to inaccurate regulation and affect the system's stability. When the timing reaches 5 minutes, the startup timing and control module sends a command to the field controller 12. Upon receiving the command, the field controller 12 quickly switches the operating mode to automatic mode. In automatic mode, the field controller 12 continuously acquires the set temperature value and the actual temperature value of the cooling water outlet of the chiller unit 10. The difference between these two temperature values ​​becomes the key basis for controlling the valve opening of the three-way flange valve seat mechanism 14.

[0044] If the actual temperature is higher than the set temperature, the field controller 12 will calculate, based on a preset control algorithm, such as a PID control algorithm, that the valve opening needs to be increased to increase the cooling water flow and lower the cooling water temperature. The field controller 12 will then send a control signal to drive the electric actuator 13 to increase the valve opening of the three-way flange valve seat mechanism 14, which can be adjusted up to 95%, allowing more low-temperature cooling water to enter the chiller unit 10, enhancing the cooling effect and gradually bringing the cooling water temperature closer to the set value. Conversely, when the actual temperature is lower than the set temperature, the field controller 12 will calculate that the valve opening needs to be decreased to reduce the cooling water flow, with the valve opening adjustable down to a minimum of 5%. Through this precise adjustment method, it is ensured that the cooling water of the chiller unit 10 is always maintained within a suitable temperature range, guaranteeing the stable operation of the chiller unit 10.

[0045] According to the present invention, a refrigeration compressor cooling water regulating device further includes a pressure detection and temperature setting adjustment module. This module can detect the discharge pressure of the main refrigeration unit; when the discharge pressure of the main refrigeration unit is higher than 1200 kPa, the set temperature value is lowered; when the discharge pressure of the main refrigeration unit is lower than 1000 kPa, the set temperature value is raised. By dynamically adjusting the set temperature value according to the discharge pressure of the main refrigeration unit, the refrigeration compressor cooling water regulating device can more intelligently adapt to different operating states of the refrigeration system and maintain the stable operation of the refrigeration system.

[0046] Specifically, when the main chiller's exhaust pressure exceeds 1200 kPa, it indicates excessive pressure within the refrigeration system, potentially caused by overload or poor heat dissipation. In this case, to alleviate system pressure, the pressure detection and temperature setting adjustment module automatically lowers the set temperature of the cooling water outlet of the chiller unit 10. After lowering the set temperature, the field controller 12 adjusts the valve opening of the three-way flange valve seat mechanism 14 based on the difference between the new set temperature and the actual temperature. For example, if the original set temperature was 30°C and the actual temperature was 32°C, the valve opening was 50%. When the set temperature drops to 28°C, the difference between the actual and set temperatures increases, causing the field controller 12 to increase the valve opening, allowing more cooling water to enter the chiller, enhancing heat dissipation, and thus lowering the chiller's temperature, thereby alleviating the problem of excessive exhaust pressure.

[0047] Conversely, when the main chiller's discharge pressure is below 1000 kPa, it indicates that the refrigeration system pressure is too low, potentially indicating insufficient refrigerant or poor evaporator heat exchange. In this case, the pressure detection and temperature setting adjustment module will increase the set temperature value. After increasing the set temperature, the field controller 12 will correspondingly reduce the cooling water flow. For example, assuming the original set temperature was 30℃ and the valve opening was 60%, increasing the set temperature to 32℃ reduces the difference between the actual and set temperatures. The field controller 12 will then decrease the valve opening, reducing the cooling water flow to prevent over-cooling of the chiller and ensure the refrigeration system operates under suitable conditions.

[0048] According to the present invention, a refrigeration compressor cooling water regulating device further includes a manual intervention module. When the actual temperature value of the cooling water outlet of the refrigeration unit 10 deviates from the set temperature value for a long time, the manual intervention module is used to input a valve opening command to the field controller 12 to restore the actual temperature value to the set temperature value. Specifically, during the operation of the refrigeration compressor cooling water regulating device, the temperature sensor 11 monitors the actual temperature value of the cooling water outlet of the refrigeration unit 10 in real time and continuously transmits the data to the field controller 12. The field controller 12 compares the actual temperature value with the preset temperature value in real time. When the actual temperature value is found to deviate from the set temperature value, the controller starts a timing mechanism. If, for a relatively long period of time, such as exceeding the preset 15 minutes, the actual temperature value still fails to return to the allowable fluctuation range of the set temperature value (e.g., the set temperature value is 25°C, the allowable fluctuation range is ±1°C, and the actual temperature value remains above 27°C or below 23°C for a long time), it is determined that an abnormal temperature deviation has occurred.

[0049] When the above-mentioned abnormal temperature deviation occurs, the operator can take action through the manual intervention module. The manual intervention module is typically equipped with an intuitive user interface, such as... Figure 3 and Figure 4 The interface can be a touchscreen or a control panel with buttons. Operators can directly input the desired valve opening command for the three-way flange valve seat mechanism 14 on the interface. Before inputting the command, operators need to make judgments based on the actual situation and their own experience. For example, if the actual temperature value is higher than the set temperature value for a long time, it indicates insufficient cooling effect, and it may be necessary to increase the valve opening to increase the cooling water volume; conversely, if the actual temperature value is lower than the set temperature value for a long time, it may be necessary to decrease the valve opening to reduce the cooling water volume. Through the manual intervention module, this refrigeration compressor cooling water regulating device provides operators with flexible means to cope with complex and changing operating conditions, further ensuring the stable operation and cooling effect of the refrigeration unit 10.

[0050] In the cooling water regulating system of a refrigeration compressor, the three-way flange valve seat mechanism 14 occupies a crucial position, directly controlling the flow rate and direction of the cooling water, and its working environment is in constant contact with the cooling water. However, the cooling water may contain various chemical substances due to water quality issues, such as dissolved oxygen, chloride ions, sulfides, and some microorganisms, which can easily corrode ordinary metal materials. According to a cooling water regulating device for a refrigeration compressor of the present invention, the three-way flange valve seat mechanism 14 includes a valve structure made of corrosion-resistant material, specifically 316L stainless steel. The valve structure of the three-way flange valve seat mechanism 14 made of 316L stainless steel extends the service life of the valve. Compared with valves made of ordinary metal materials, it reduces the frequency of maintenance and replacement due to corrosion, thus lowering maintenance costs.

[0051] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the refrigeration compressor cooling water regulating device according to a preferred embodiment of the present invention mainly consists of a field controller 12 (PLC), a temperature sensor 11, an electric actuator 13, and a three-way flange valve seat mechanism 14. The device installs temperature sensors 11 at the cooling water inlet and outlet of the refrigeration unit 10 to detect the temperature signal of the cooling water and convert it into an analog signal for output to the PLC. Simultaneously, a three-way valve and a temperature sensor 11 are installed on the inlet and outlet pipes 22 of the cooling circulating water of the refrigeration unit 10. A three-way flange valve seat mechanism 14 and an electric actuator 13 are installed below the sensors, and a loop is established between the three-way valve and the three-way flange valve seat mechanism 14.

[0052] When the device is running, after receiving the analog signal from the temperature sensor 11, the PLC compares the detected actual cooling water temperature with the set value and calculates the deviation. Subsequently, based on the PID control algorithm, the PLC drives the electric actuator 13 to precisely control the valve flow of the three-way flange valve seat mechanism 14, thereby ensuring a constant outlet water temperature of the cooling water system and achieving constant temperature control of the cooling water outlet water of the chiller unit 10.

[0053] The device employs different temperature control strategies under varying operating conditions. When the main chiller is in a shutdown (power-on) state, the shutdown control module controls the PID adjustment of the field controller 12 to enter manual mode. At this time, the valve opening of the three-way flange valve seat mechanism 14 is fixed at 25%, with inlet water directly connected to the outlet, and 75% of the water entering the chiller system. When the chiller system starts, the start-up timing and control module begins timing. After 5 minutes, it controls the PID adjustment of the field controller 12 to enter automatic mode. The system automatically adjusts the valve opening of the three-way flange valve seat mechanism 14 based on the difference between the set temperature (default 25℃) and the actual temperature, with an adjustment range of 5%-95%. Furthermore, the set temperature can be adjusted based on the chiller's exhaust pressure. If the exhaust pressure is higher than 1200 kPa, the pressure detection and temperature setting adjustment module lowers the set temperature; if it is lower than 1000 kPa, the set temperature is raised, thus achieving constant outlet water temperature control.

[0054] If the actual temperature of the cooling water outlet of chiller unit 10 deviates from the set temperature for an extended period, the operator can intervene via the manual intervention module. After clicking the "Manual" button, the operator can input the appropriate valve opening command through the operation panel (OP) to quickly restore the outlet water temperature to the set value. Here, the valve opening value represents the percentage of bypass water flow.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "method," "specific method," or "some methods," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or method is included in at least one embodiment or method of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or method. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or methods. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or methods described in this specification, as well as the features of different embodiments or methods.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling water regulating device for a refrigeration compressor, characterized in that, include: A temperature sensor is installed on the cooling water outlet and cooling water inlet of the refrigeration unit and / or on the inlet and outlet pipes of the cooling water system to detect the cooling water temperature and output an analog signal. The cooling water outlet is connected to the inlet pipe, and the cooling water inlet is connected to the outlet pipe. The field controller is electrically connected to the temperature sensor and receives analog signals. An electric actuator is connected to the field controller and receives control signals; The three-way flange valve seat mechanism is installed on the inlet pipe of the cooling water system and is connected to the upstream, downstream and outlet pipes of the inlet pipe respectively. The electric actuator drives the three-way flange valve seat mechanism to regulate the water flow in the circuit under the control of the field controller, thereby regulating the cooling water outlet temperature of the refrigeration unit.

2. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, The field controller is a PLC; After receiving the analog signal from the temperature sensor, the PLC calculates the deviation between the actual temperature and the set temperature, and generates a control signal based on the PID control algorithm to drive the electric actuator.

3. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, It also includes a display module, which is connected to the field controller and is used to display the PID adjustment parameters in real time; The PID control parameters include proportional coefficient P, integral coefficient I, derivative coefficient D, dead zone, set temperature value, actual temperature value, and valve opening value.

4. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, The temperature sensor is a high-precision sensor with a measurement accuracy of ±0.1℃.

5. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, The electric actuator is an intelligent electric actuator with fault self-diagnosis function; The electric actuator is equipped with a remote communication interface to enable remote control.

6. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, It also includes a shutdown status control module; When the main refrigeration unit of the refrigeration unit is in a shutdown state, the shutdown state control module controls the field controller to operate in manual mode, and at this time the valve opening of the three-way flange valve seat mechanism is fixed at 25%.

7. The refrigeration compressor cooling water regulating device according to claim 1, characterized in that, It also includes a start-up timing and control module; When the main chiller of the chiller unit starts, the start-up timing and control module starts timing. When the timing reaches 5 minutes, it controls the field controller to run in automatic mode and automatically adjusts the valve opening of the three-way flange valve seat mechanism according to the difference between the set temperature value and the actual temperature value of the cooling water outlet of the chiller unit. The valve opening adjustment range is 5%-95%.

8. The refrigeration compressor cooling water regulating device according to claim 7, characterized in that, It also includes a pressure detection and temperature setting adjustment module, which can detect the exhaust pressure of the main refrigeration unit; When the main refrigeration unit's exhaust pressure exceeds 1200 kPa, the set temperature value is reduced. When the main refrigeration unit's exhaust pressure is below 1000 kPa, the set temperature value is increased.

9. The refrigeration compressor cooling water regulating device according to claim 7, characterized in that, It also includes a manual intervention module; When the actual temperature value of the cooling water outlet of the refrigeration unit deviates from the set temperature value for a long time, the manual intervention module is manually operated to input a valve opening command to the field controller, so that the actual temperature value is restored to the set temperature value.

10. The refrigeration compressor cooling water regulating device according to any one of claims 1-9, characterized in that, The three-way flange valve seat mechanism includes a valve structure made of corrosion-resistant material, namely 316L stainless steel.

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