A temperature-controlled water chiller water tank liquid supplement control method and system

Abstract

This invention provides a method and system for controlling the replenishment of liquid in a temperature-controlled chiller water tank. The data acquisition module includes a temperature sensor and three level gauges at different heights. The data acquisition module transmits the acquired data to the control module, which then adjusts the liquid level and temperature (T) according to the actual liquid level. tank Different control strategies are selected; if the actual liquid level is between medium and high, the liquid replenishment module selects a temperature-priority liquid replenishment control strategy; if the actual liquid level is between low and medium, a liquid replenishment control strategy that prioritizes liquid replenishment but also considers temperature is selected; simultaneously, the current actual temperature T is compared. tank Set the cooling temperature T set Compared to the actual temperature T several minutes ago tankn The system assesses the degree of temperature change and controls the refrigeration module for adaptive temperature control. Based on the actual liquid level and temperature in the circulating liquid tank, it dynamically adjusts the operating modes of the replenishment module's turntable and the refrigeration module to achieve the dual goals of "liquid level replenishment" and "temperature stability."

Description

Technical Field

[0001] This invention belongs to the field of temperature-controlled chiller control technology, and particularly relates to a method and system for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller. Background Technology

[0002] Temperature-controlled chillers are widely used in commercial applications requiring stable low-temperature environments. Their core function is heat exchange through the circulation of a circulating fluid. Due to potential minor leaks and evaporation, the amount of circulating fluid in the tank will gradually decrease, requiring periodic replenishment to ensure the system's normal operation.

[0003] Existing patent CN119802980A discloses an integrated automatic liquid replenishment system for chillers, including a liquid replenishment device. One end of the liquid replenishment device is connected to a liquid replenishment control device, which includes a liquid replenishment drive component and a liquid replenishment switch component. The other end of the liquid replenishment device is connected to several chillers, and the chillers are connected to each other and to the liquid replenishment device via water and air circuits. The liquid replenishment device includes a liquid replenishment tank and a detection component installed inside the tank. This patent enables intelligent liquid replenishment by automatically monitoring the liquid levels of multiple chillers, reducing manual intervention, lowering maintenance costs, and improving equipment operating efficiency and safety. Summary of the Invention

[0004] During the replenishment process of a temperature-controlled chiller, the replenished circulating fluid (often at room temperature or higher than the existing circulating fluid temperature in the tank) causes a rapid increase in the temperature of the circulating fluid in the tank. If the replenishment is not properly controlled, it will disrupt the temperature stability of the refrigeration module and affect the cooling effect at the terminal. Furthermore, blindly switching cooling modes will result in energy waste. Therefore, a replenishment control method based on coordinated feedback of liquid level and temperature is urgently needed to solve these problems.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is a method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller, comprising the following steps: S1. Divide the actual circulating fluid level in the water tank into three levels: high, medium, and low, and continuously collect the current actual fluid level data and the actual circulating fluid temperature T. tank ; S2. Select different replenishment control strategies based on the current actual liquid level. If the actual liquid level is between the medium and high levels, the replenishment module will select a temperature-priority replenishment control strategy. If the actual liquid level is between the low and medium levels, a replenishment control strategy that prioritizes replenishment but also takes temperature into account will be selected. S3, compare the current actual temperature T tank With the set cooling temperature T set Perform temperature control and compare the current actual temperature T. tank Compared to the actual temperature T several minutes ago tanknThe system determines the degree of temperature change and controls the cooling module to perform adaptive temperature control.

[0006] Specifically, during actual control, if the current liquid level exceeds the high setting and has been continuously exceeding the limit time t, the liquid replenishment module stops operating; if the actual temperature is greater than the sum of the set cooling temperature and the first temperature threshold c, the cooling module is started until the actual temperature is lower than the set cooling temperature and then cooling stops; if the actual temperature is greater than the sum of the set cooling temperature and the second temperature threshold d, the liquid replenishment module stops operating, and the cooling module switches to rapid cooling mode and operates with priority.

[0007] Specifically, when S2 detects that the actual liquid level is between the medium and high levels for a certain period of time, it performs specific temperature-controlled liquid replenishment control judgment according to the temperature-priority liquid replenishment control strategy; if the current actual temperature T tank Less than the set cooling temperature T set The sum of the temperature and the first temperature threshold c will control the refrigeration module to operate in energy-saving mode to maintain basic refrigeration, while the liquid replenishment module replenishes liquid normally.

[0008] Specifically, when making specific temperature-controlled replenishment decisions according to the temperature-priority replenishment control strategy, if the current actual temperature T tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of T and the second temperature threshold d is used to determine the degree of temperature change; if T tankn -T tank At ≤2℃, the liquid replenishment module replenishes normally, and the refrigeration module operates in energy-saving mode to maintain basic refrigeration.

[0009] Specifically, when making specific temperature-controlled replenishment decisions according to the temperature-priority replenishment control strategy, if the current actual temperature T tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of the second temperature threshold d, and the determination of the degree of temperature change T tankn -T tank >2℃, at this point, the liquid replenishment module will replenish liquid normally, and the cooling module will switch to rapid cooling mode to suppress temperature rise; if the current actual temperature T tank greater than the set cooling temperature T set When the sum of the liquid and the second temperature threshold d is reached, the liquid replenishment module stops replenishing the liquid, the cooling mode switches to rapid cooling mode, and it is given priority in operation.

[0010] Specifically, when S2 detects that the actual liquid level is between low and medium for a certain period of time, it performs specific temperature-controlled liquid replenishment control judgment according to the liquid replenishment control strategy that prioritizes liquid replenishment but also takes temperature into account; if the current actual temperature Ttank Less than the set cooling temperature T set The sum of the liquid replenishment module and the first temperature threshold c accelerates the liquid replenishment, while the cooling module operates in energy-saving mode to maintain basic cooling.

[0011] Specifically, when making specific judgments regarding temperature-controlled replenishment based on a replenishment control strategy that prioritizes replenishment while also considering temperature, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of T and the second temperature threshold d is used to determine the degree of temperature change; if T tankn -T tank ≤0℃, the liquid replenishment module accelerates liquid replenishment, and the refrigeration module operates in energy-saving mode to maintain basic cooling; if T tankn -T tank If the temperature is >0℃, the liquid replenishment module will accelerate the liquid replenishment, and the refrigeration module will switch to rapid cooling mode.

[0012] Specifically, when making specific judgments regarding temperature-controlled replenishment based on a replenishment control strategy that prioritizes replenishment while also considering temperature, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the temperature and the second temperature threshold d is used to temporarily shut down the liquid replenishment module, stopping liquid replenishment. The cooling module switches to rapid cooling mode, prioritizing temperature reduction, until the current actual temperature T is reached. tank Less than the set cooling temperature T set The liquid replenishment module is restarted after being summed with the first temperature threshold c.

[0013] Specifically, when S2 detects that the actual liquid level is below the low setting for 10 seconds, emergency control is activated. The liquid replenishment module maximizes the liquid replenishment rate and shuts down the circulation pump, while the cooling module switches to rapid cooling mode; this continues until the current actual liquid level exceeds the medium setting and the current actual temperature T... tank Less than the set cooling temperature T set After the sum of the first temperature threshold c, the circulation pump is restarted.

[0014] This invention also provides a temperature-controlled chiller water tank replenishment control system, using the aforementioned temperature-controlled chiller water tank replenishment control method, including a data acquisition module. The data acquisition module includes a temperature sensor and three level gauges at different heights. The data acquisition module transmits the acquired data to a control module, which then determines the appropriate level based on the current actual liquid level and actual temperature T. tank Different control strategies can be selected; the control module controls the actuators to perform refrigeration and liquid replenishment control; the actuators include the refrigeration module, the liquid replenishment module, and the chiller's circulation pump; the refrigeration module has a rapid cooling mode for fast cooling, and also an energy-saving mode to ensure basic cooling.

[0015] The beneficial effects of this invention are that, based on the actual liquid level (high, medium and low thresholds) and actual temperature (difference from the set temperature and temperature change rate) of the circulating liquid tank, the operating modes (energy-saving mode and rapid cooling mode) of the liquid replenishment module turntable and the refrigeration module are dynamically adjusted to achieve the dual goals of "liquid level replenishment" and "temperature stability", thus taking into account both the performance and energy efficiency optimization. Attached Figure Description

[0016] Figure 1 This is a flowchart of the control logic of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the present invention.

[0018] In the diagram, 1 represents the liquid replenishment module, 2 represents the cooling module, and 3 represents the level gauge of the data acquisition module. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1: A method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller, comprising the following steps: S1. Divide the actual circulating fluid level in the water tank into three levels: high, medium, and low, and continuously collect the current actual fluid level data and the actual circulating fluid temperature T. tank ; S2. Select different replenishment control strategies based on the current actual liquid level. If the actual liquid level is between the medium and high levels, the replenishment module will select a temperature-priority replenishment control strategy. If the actual liquid level is between the low and medium levels, a replenishment control strategy that prioritizes replenishment but also takes temperature into account will be selected. S3, compare the current actual temperature T tank With the set cooling temperature T set Perform temperature control and compare the current actual temperature T. tank Compared to the actual temperature T several minutes ago tankn The system determines the degree of temperature change and controls the cooling module to perform adaptive temperature control.

[0021] This embodiment also provides a temperature-controlled chiller water tank replenishment control system, using the aforementioned temperature-controlled chiller water tank replenishment control method. The system includes a data acquisition module, which comprises a temperature sensor and three level gauges at different heights. The data acquisition module transmits the acquired data to a control module, which then determines the appropriate level based on the current actual liquid level and actual temperature T. tank Different control strategies can be selected; the control module controls the actuators to perform refrigeration and liquid replenishment control; the actuators include the refrigeration module, the liquid replenishment module, and the chiller's circulation pump; the refrigeration module has a rapid cooling mode for fast cooling, and also an energy-saving mode to ensure basic cooling.

[0022] In the specific application process of this embodiment, three liquid level gauges are sequentially arranged in the water tank from bottom to top. S 液 is the actual circulating liquid level of the water tank; S 高 、S 中 、S 低 are the high, medium, and low level set points of the water tank (increasing sequentially from bottom to top); the three liquid level gauges respectively correspond to S 高 、S 中 、S 低 , and the system monitors in real time whether the liquid level reaches the corresponding threshold. In the specific implementation process of this embodiment, S 高 is 80 cm, S 中 is 50 cm, S 低 is 20 cm.

[0023] Meanwhile, during the temperature detection process, the system collects the current actual temperature T tank and records it. T tankn represents the actual temperature of the circulating liquid in the water tank n minutes ago (n is a constant, recommended 5 ≤ n ≤ 10); in the specific application process of this embodiment, n takes 5 min.

[0024] During the specific temperature judgment process, there are also two temperature thresholds, including the first temperature threshold c and the second temperature threshold d, which are used to define the temperature deviation level. 0 < c < d, in this embodiment, c takes 2 °C and d takes 5 °C.

[0025] In this embodiment, the liquid supplement module includes a liquid supplement solenoid valve and a liquid supplement pipe group; the liquid supplement solenoid valve controls the on / off of the liquid supplement. The circulation module includes a circulation pipe group and a circulation pump arranged on the circulation pipe group to control the flow of the circulating liquid. The core of the refrigeration module is a variable-frequency refrigeration compressor, which operates optimally at low frequency in the energy-saving mode and at full load at high frequency in the quick-cooling mode. The operating frequency of the variable-frequency refrigeration compressor in the energy-saving mode is 30 Hz, and the operating frequency in the quick-cooling mode is 60 Hz.

[0026] The control logic in the specific application process Figure 1 is shown as follows: When any of the following situations is detected, the liquid supplement solenoid valve is controlled to close and the liquid supplement is stopped: S 液 ≥S 高 and it lasts for 30 s (the water tank is full to avoid overflow); T tank ≥T set +d (the temperature of the circulating liquid far exceeds the set value, prioritize refrigeration to cool down and suspend the liquid supplement).

[0027] When it is detected that T tank ≥T set +c, the refrigeration module automatically starts to work until T tank≤T set Then stop cooling (to ensure that the circulating liquid temperature remains stable within the set range).

[0028] If the liquid level range S is detected 中 ≤S 液 ≤S 高 And it has been running for 10 minutes, ruling out the possibility of instantaneous liquid level fluctuations. At this point, control is based on the temperature parameters. If T tank <T set +c indicates that the temperature deviation is small and close to the set value. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (maintaining basic cooling and avoiding energy waste). If T set +c ≤ T tank < T set +d indicates a moderate temperature deviation; at this point, compare it to the actual temperature T. tank And the actual temperature T several minutes ago tankn Determine the degree of temperature change. If T tankn - T tank ≤2℃ indicates that the temperature rises slowly or tends to stabilize. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (when the temperature changes steadily, energy saving is prioritized). If T set +c ≤ T tank < T set + d, and T tankn - T tank If the temperature is above 2℃, it indicates that the temperature is rising rapidly. At this time, the liquid replenishment solenoid valve will open to replenish the liquid normally; the refrigeration module will switch to rapid cooling mode (to quickly suppress the temperature rise and ensure the cooling effect). If T tank ≥T set +d indicates that the current temperature deviates significantly from the preset temperature. At this time, the liquid replenishment solenoid valve is closed to stop liquid replenishment; the refrigeration module switches to rapid cooling mode (prioritizing cooling down, and replenishing liquid only after the temperature reaches the target).

[0029] If a low liquid level is detected, S 低 ≤S 液 ≤S 中 The liquid level has been low for 10 minutes, and it needs to be replenished first, while also considering the temperature. The control should be adjusted according to the temperature parameters. If T tank <T set +c controls the opening of the liquid replenishment solenoid valve to accelerate liquid replenishment; the refrigeration module maintains energy-saving mode operation. If T set +c ≤ T tank < Tset + d, and T tankn - T tank ≤0℃ indicates that the temperature has not risen or fallen. At this time, the liquid replenishment solenoid valve is opened to accelerate liquid replenishment; the refrigeration module keeps running in energy-saving mode. If T set +c ≤ T tank < T set + d, and T tankn - T tank When the temperature is above 0℃, the solenoid valve for replenishing liquid is opened to accelerate the replenishment of liquid; the refrigeration module switches to rapid cooling mode to balance the replenishment of liquid and the cooling process. T tank ≥T set + d, controls the liquid replenishment solenoid valve to close, stopping liquid replenishment; the refrigeration module switches to rapid cooling mode, executing a priority cooling strategy, waiting... The fluid resuscitation was then restarted.

[0030] Example 2: A method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller, comprising the following steps: S1. Divide the actual circulating fluid level in the water tank into three levels: high, medium, and low, and continuously collect the current actual fluid level data and the actual circulating fluid temperature T. tank ; S2. Select different replenishment control strategies based on the current actual liquid level. If the actual liquid level is between the medium and high levels, the replenishment module will select a temperature-priority replenishment control strategy. If the actual liquid level is between the low and medium levels, a replenishment control strategy that prioritizes replenishment but also takes temperature into account will be selected. S3, compare the current actual temperature T tank With the set cooling temperature T set Perform temperature control and compare the current actual temperature T. tank Compared to the actual temperature T several minutes ago tankn The system determines the degree of temperature change and controls the cooling module to perform adaptive temperature control.

[0031] This embodiment also provides a temperature-controlled chiller water tank replenishment control system, using the aforementioned temperature-controlled chiller water tank replenishment control method. The system includes a data acquisition module, which comprises a temperature sensor and three level gauges at different heights. The data acquisition module transmits the acquired data to a control module, which then determines the appropriate level based on the current actual liquid level and actual temperature T. tank Different control strategies can be selected; the control module controls the actuators to perform refrigeration and liquid replenishment control; the actuators include the refrigeration module, the liquid replenishment module, and the chiller's circulation pump; the refrigeration module has a rapid cooling mode for fast cooling, and also an energy-saving mode to ensure basic cooling.

[0032] In the specific application process of this embodiment, three liquid level gauges are arranged in the water tank from bottom to top. S 液 is the actual circulating liquid level of the water tank; S 高 , S 中 , S 低 are the high, medium, and low level set points of the water tank (increasing in sequence from bottom to top); the three liquid level gauges respectively correspond to S 高 , S 中 , S 低 , and real-time monitor whether the liquid level reaches the corresponding threshold. In the specific implementation process of this embodiment, S 高 is 80 cm, S 中 is 50 cm, S 低 is 20 cm.

[0033] Meanwhile, during the temperature detection process, the system real-time collects the current actual temperature T tank and records it. T tankn represents the actual temperature of the circulating liquid in the water tank n minutes ago (n is a constant, recommended 5 ≤ n ≤ 10); in the specific application process of this embodiment, n takes 5 min.

[0034] During the specific temperature judgment process, there are also two temperature thresholds, including the first temperature threshold c and the second temperature threshold d, which are used to define the temperature deviation level. 0 < c < d, in this embodiment, c takes 2 °C and d takes 5 °C.

[0035] In this embodiment, the liquid supplement module includes a liquid supplement solenoid valve and a liquid supplement pipe group; the liquid supplement solenoid valve controls the on / off of the liquid supplement. The circulation module includes a circulation pipe group and a circulation pump arranged on the circulation pipe group to control the flow of the circulating liquid. The core of the refrigeration module is a variable-frequency refrigeration compressor, which operates optimally at low frequency in the energy-saving mode and at full load at high frequency in the quick-cooling mode. The operating frequency of the variable-frequency refrigeration compressor in the energy-saving mode is 30 Hz, and the operating frequency in the quick-cooling mode is 60 Hz.

[0036] The control logic in the specific application process is as follows: When any of the following situations is detected, control the liquid supplement solenoid valve to close and stop the liquid supplement: S 液 ≥ S 高 and last for 30 s (the water tank liquid level is full, to avoid overflow); T tank ≥ T set + d (the circulating liquid temperature far exceeds the set value, prioritize refrigeration to cool down and postpone the liquid supplement). [[ID=…]]​​​​​​​​Then stop cooling (to ensure that the circulating liquid temperature remains stable within the set range).

[0038] If the liquid level range S is detected 中 ≤S 液 ≤S 高 And it has been running for 10 minutes, ruling out the possibility of instantaneous liquid level fluctuations. At this point, control is based on the temperature parameters. If T tank <T set +c indicates that the temperature deviation is small and close to the set value. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (maintaining basic cooling and avoiding energy waste). If T set +c ≤ T tank < T set +d indicates a moderate temperature deviation; at this point, compare it to the actual temperature T. tank And the actual temperature T several minutes ago tankn Determine the degree of temperature change. If T tankn - T tank ≤2℃ indicates that the temperature rises slowly or tends to stabilize. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (when the temperature changes steadily, energy saving is prioritized). If T set +c ≤ T tank < T set + d, and T tankn - T tank If the temperature is above 2℃, it indicates that the temperature is rising rapidly. At this time, the liquid replenishment solenoid valve will open to replenish the liquid normally; the refrigeration module will switch to rapid cooling mode (to quickly suppress the temperature rise and ensure the cooling effect). If T tank ≥T set +d indicates that the current temperature deviates significantly from the preset temperature. At this time, the liquid replenishment solenoid valve is closed to stop liquid replenishment; the refrigeration module switches to rapid cooling mode (prioritizing cooling down, and replenishing liquid only after the temperature reaches the target).

[0039] If a low liquid level is detected, S 低 ≤S 液 ≤S 中 The liquid level has been low for 10 minutes, and it needs to be replenished first, while also considering the temperature. The control should be adjusted according to the temperature parameters. If T tank <T set +c controls the opening of the liquid replenishment solenoid valve to accelerate liquid replenishment; the refrigeration module maintains energy-saving mode operation. If T set +c ≤ T tank < T set+ d, and T tankn - T tank ≤0℃ indicates that the temperature has not risen or fallen. At this time, the liquid replenishment solenoid valve is opened to accelerate liquid replenishment; the refrigeration module keeps running in energy-saving mode. If T set +c ≤ T tank < T set + d, and T tankn - T tank When the temperature is above 0℃, the solenoid valve for replenishing liquid is opened to accelerate the replenishment of liquid; the refrigeration module switches to rapid cooling mode to balance the replenishment of liquid and the cooling process. T tank ≥T set + d, controls the liquid replenishment solenoid valve to close, stopping liquid replenishment; the refrigeration module switches to rapid cooling mode, executing a priority cooling strategy, waiting... The fluid resuscitation was then restarted.

[0040] If liquid level S is detected 液 低 If the temperature remains below the warning level for 10 seconds, it indicates an abnormality in the circulating fluid, with an urgent shortage of fluid level, requiring emergency control measures. At this time, keep the replenishment solenoid valve open to maximize the replenishment rate; simultaneously, shut down the circulating pump to prevent dry running and damage to the equipment; switch the refrigeration module to rapid cooling mode (to anticipate the temperature rise caused by replenishment); continue until the signal is detected. 中 ≤S 液 And T tank <T set After pressing +c, the circulation pump restarts, restoring the circulation system to normal operation, and the control system switches back to the conventional control logic.

[0041] Example 3: A method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller, comprising the following steps: S1. Divide the actual circulating fluid level in the water tank into three levels: high, medium, and low, and continuously collect the current actual fluid level data and the actual circulating fluid temperature T. tank ; S2. Select different replenishment control strategies based on the current actual liquid level. If the actual liquid level is between the medium and high levels, the replenishment module will select a temperature-priority replenishment control strategy. If the actual liquid level is between the low and medium levels, a replenishment control strategy that prioritizes replenishment but also takes temperature into account will be selected. S3, compare the current actual temperature T tank With the set cooling temperature T set Perform temperature control and compare the current actual temperature T. tank Compared to the actual temperature T several minutes ago tankn The system determines the degree of temperature change and controls the cooling module to perform adaptive temperature control. ​

[0042] This embodiment also provides a liquid replenishment control system for the water tank of a temperature-controlled chiller, which uses the above-mentioned liquid replenishment control method for the water tank of a temperature-controlled chiller. It includes a data acquisition module, and the data acquisition module includes a temperature sensor and three liquid level gauges with different heights; the data acquisition module transmits the collected data to the control module, and the control module selects different control strategies according to the current actual liquid level and the actual temperature T tank ; the control module controls the actuator to perform refrigeration and liquid replenishment control; the actuator includes a refrigeration module, a liquid replenishment module and the circulation pump of the chiller; the refrigeration module has a rapid cooling mode for rapid refrigeration, and also has an energy-saving mode, and the basic refrigeration is ensured in the energy-saving mode.

[0043] In the specific application process of this embodiment, three liquid level gauges are arranged in the water tank from bottom to top. S 液 is the actual circulating liquid level of the water tank; S 高 , S 中 , S 低 are the high, middle and low level set points of the water tank (increasing in sequence from bottom to top); the three liquid level gauges respectively correspond to S 高 , S 中 , S 低 , and the system monitors in real time whether the liquid level reaches the corresponding threshold. In the specific implementation process of this embodiment, S 高 is 80 cm, S 中 is 50 cm, and S 低 is 20 cm.

[0044] At the same time, during the temperature detection process, the system collects the current actual temperature T tank and records it. T tankn represents the actual temperature of the circulating liquid in the water tank n minutes ago (n is a constant, and it is recommended that 5 ≤ n ≤ 10); in the specific application process of this embodiment, n takes 5 min.

[0045] During the specific temperature judgment process, there are also two temperature thresholds, including the first temperature threshold c and the second temperature threshold d, which are used to define the temperature deviation level. 0 < c < d, in this embodiment, c takes 2 °C and d takes 5 °C.

[0046] In this embodiment, the liquid replenishment module includes a liquid replenishment solenoid valve and a liquid replenishment pipe group; the liquid replenishment solenoid valve controls the on-off of the liquid replenishment. The circulation module includes a circulation pipe group and a circulation pump arranged on the circulation pipe group to control the flow of the circulating liquid. The core of the refrigeration module is a variable-frequency refrigeration compressor, which operates optimally at a low frequency in the energy-saving mode and at a high frequency with full load in the rapid cooling mode. The operating frequency of the variable-frequency refrigeration compressor in the energy-saving mode is 30 Hz, and the operating frequency in the rapid cooling mode is 60 Hz.

[0047] The control logic in the specific application process is as follows: When any of the following situations is detected, the control replenishes the liquid solenoid valve to close and stops the liquid replenishment: S 液 ≥S 高 And continue for 30 seconds (the water tank is full to prevent overflow); T tank ≥T set +d (Circulating fluid temperature is far above the set value, prioritize cooling and temperature reduction, and temporarily suspend fluid replenishment).

[0048] When T is detected tank ≥T set When +c is applied, the cooling module automatically starts working until T. tank ≤T set Then stop cooling (to ensure that the circulating liquid temperature remains stable within the set range).

[0049] If the liquid level range S is detected 中 ≤S 液 ≤S 高 And it has been running for 10 minutes, ruling out the possibility of instantaneous liquid level fluctuations. At this point, control is based on the temperature parameters. If T tank <T set +c indicates that the temperature deviation is small and close to the set value. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (maintaining basic cooling and avoiding energy waste). If T set +c ≤ T tank < T set +d indicates a moderate temperature deviation; at this point, compare it to the actual temperature T. tank And the actual temperature T several minutes ago tankn Determine the degree of temperature change. If T tankn - T tank ≤2℃ indicates that the temperature rises slowly or tends to stabilize. At this time, the liquid replenishment solenoid valve is opened to replenish the liquid normally; the refrigeration module keeps running in energy-saving mode (when the temperature changes steadily, energy saving is prioritized). If T set +c ≤ T tank < T set + d, and T tankn - T tank If the temperature is above 2℃, it indicates that the temperature is rising rapidly. At this time, the liquid replenishment solenoid valve will open to replenish the liquid normally; the refrigeration module will switch to rapid cooling mode (to quickly suppress the temperature rise and ensure the cooling effect). If T tank ≥T set +d indicates that the current temperature deviates significantly from the preset temperature. At this time, the liquid replenishment solenoid valve is closed to stop liquid replenishment; the refrigeration module switches to rapid cooling mode (prioritizing cooling down, and replenishing liquid only after the temperature reaches the target).

[0050] If a low liquid level is detected, S 低 ≤S 液 ≤S 中 The liquid level has been low for 10 minutes, and it needs to be replenished first, while also considering the temperature. The control should be adjusted according to the temperature parameters. If T tank <T set +c controls the opening of the liquid replenishment solenoid valve to accelerate liquid replenishment; the refrigeration module maintains energy-saving mode operation. If T set +c ≤ T tank < T set + d, and T tankn - T tank ≤0℃ indicates that the temperature has not risen or fallen. At this time, the liquid replenishment solenoid valve is opened to accelerate liquid replenishment; the refrigeration module keeps running in energy-saving mode. If T set +c ≤ T tank < T set + d, and T tankn - T tank When the temperature is above 0℃, the solenoid valve for replenishing liquid is opened to accelerate the replenishment of liquid; the refrigeration module switches to rapid cooling mode to balance the replenishment of liquid and the cooling process. T tank ≥T set + d, controls the liquid replenishment solenoid valve to close, stopping liquid replenishment; the refrigeration module switches to rapid cooling mode, executing a priority cooling strategy, waiting... The fluid resuscitation was then restarted.

[0051] If liquid level S is detected 液 低 If the temperature remains below the warning level for 10 seconds, it indicates an abnormality in the circulating fluid, with an urgent shortage of fluid level, requiring emergency control measures. At this time, keep the replenishment solenoid valve open to maximize the replenishment rate; simultaneously, shut down the circulating pump to prevent dry running and damage to the equipment; switch the refrigeration module to rapid cooling mode (to anticipate the temperature rise caused by replenishment); continue until the signal is detected. 中 ≤S 液 And T tank <T set After pressing +c, the circulation pump restarts, restoring the circulation system to normal operation, and the control system switches back to the conventional control logic.

[0052] This embodiment uses a dual feedback mechanism of liquid level and temperature to dynamically adjust the liquid replenishment status and cooling mode, which not only avoids temperature runaway caused by liquid replenishment, but also achieves energy efficiency optimization through mode switching. At the same time, the emergency control logic ensures the safe operation of the equipment. It is suitable for liquid replenishment control scenarios of circulating liquid tanks in various commercial temperature-controlled chillers. ​

[0053] The temperature-controlled chiller in this embodiment is as follows: Figure 2 As shown, three level gauges are installed in the water tank from bottom to top to monitor whether the liquid level has reached the corresponding threshold in real time; a temperature sensor is installed near the water outlet in the water tank to accurately monitor the actual temperature of the circulating liquid; the replenishment pipe group is connected in series with the replenishment solenoid valve, and the circulation pipe group is connected in series with the circulation pump, both of which are linked to the chiller control system signal; the refrigeration module uses a variable frequency compressor, which supports switching between energy-saving mode (low frequency optimal energy efficiency operation) and rapid cooling mode (high frequency rapid cooling operation).

Claims

1. A method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller, characterized in that, Includes the following steps: S1. Divide the actual circulating fluid level in the water tank into three levels: high, medium, and low, and continuously collect the current actual fluid level data and the actual circulating fluid temperature T. tank ; S2. Select different replenishment control strategies based on the current actual liquid level. If the actual liquid level is between the medium and high levels, the replenishment module will select a temperature-priority replenishment control strategy. If the actual liquid level is between the low and medium levels, a replenishment control strategy that prioritizes replenishment but also takes temperature into account will be selected. S3, compare the current actual temperature T tank With the set cooling temperature T set Perform temperature control and compare the current actual temperature T. tank Compared to the actual temperature T several minutes ago tankn The system determines the degree of temperature change and controls the cooling module to perform adaptive temperature control.

2. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 1, characterized in that, During actual control, if the current liquid level exceeds the high setting and has been continuously exceeded for a time t, the liquid replenishment module stops operating; if the actual temperature is greater than the sum of the set cooling temperature and the first temperature threshold c, the cooling module is started until the actual temperature is lower than the set cooling temperature and then cooling stops; if the actual temperature is greater than the sum of the set cooling temperature and the second temperature threshold d, the liquid replenishment module stops operating, and the cooling module switches to rapid cooling mode and operates with priority.

3. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 1, characterized in that, When S2 detects that the actual liquid level is between the medium and high levels for a certain period of time, it performs specific temperature-controlled liquid replenishment control judgment according to the temperature-priority liquid replenishment control strategy; if the current actual temperature T tank Less than the set cooling temperature T set The sum of the temperature and the first temperature threshold c will control the refrigeration module to operate in energy-saving mode to maintain basic refrigeration, while the liquid replenishment module replenishes liquid normally.

4. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 3, characterized in that, When making specific temperature-controlled replenishment decisions according to a temperature-priority replenishment control strategy, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of T and the second temperature threshold d is used to determine the degree of temperature change; if T tankn -T tank At ≤2℃, the liquid replenishment module replenishes normally, and the refrigeration module operates in energy-saving mode to maintain basic refrigeration.

5. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 3 or 4, characterized in that, When making specific temperature-controlled replenishment decisions according to a temperature-priority replenishment control strategy, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of the second temperature threshold d, and the determination of the degree of temperature change T tankn -T tank >2℃, at this point, the liquid replenishment module will replenish liquid normally, and the cooling module will switch to rapid cooling mode to suppress temperature rise; if the current actual temperature T tank greater than the set cooling temperature T set When the sum of the liquid and the second temperature threshold d is reached, the liquid replenishment module stops replenishing the liquid, the cooling mode switches to rapid cooling mode, and it is given priority in operation.

6. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 1, characterized in that, When S2 detects that the actual liquid level is between low and medium for a certain period of time, it performs specific temperature-controlled liquid replenishment control judgment according to the liquid replenishment control strategy that prioritizes liquid replenishment but also considers temperature; if the current actual temperature T tank Less than the set cooling temperature T set The sum of the liquid replenishment module and the first temperature threshold c accelerates the liquid replenishment, while the cooling module operates in energy-saving mode to maintain basic cooling.

7. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 6, characterized in that, When making specific temperature-controlled replenishment decisions based on a replenishment control strategy that prioritizes replenishment while also considering temperature, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the first temperature threshold c, but less than the set cooling temperature T. set The sum of T and the second temperature threshold d is used to determine the degree of temperature change; if T tankn -T tank ≤0℃, the liquid replenishment module accelerates liquid replenishment, and the refrigeration module operates in energy-saving mode to maintain basic cooling; if T tankn -T tank If the temperature is >0℃, the liquid replenishment module will accelerate the liquid replenishment, and the refrigeration module will switch to rapid cooling mode.

8. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 6, characterized in that, When making specific temperature-controlled replenishment decisions based on a replenishment control strategy that prioritizes replenishment while also considering temperature, if the current actual temperature T... tank greater than the set cooling temperature T set The sum of the temperature and the second temperature threshold d is used to temporarily shut down the liquid replenishment module, stopping liquid replenishment. The cooling module switches to rapid cooling mode, prioritizing temperature reduction, until the current actual temperature T is reached. tank Less than the set cooling temperature T set The liquid replenishment module is restarted after being summed with the first temperature threshold c.

9. The method for controlling the replenishment of liquid in the water tank of a temperature-controlled chiller according to claim 1, characterized in that, When S2 detects that the actual liquid level is below the low setting for 10 seconds, emergency control is activated. The liquid replenishment module maximizes the liquid replenishment rate and shuts down the chiller's circulation module, while the refrigeration module switches to rapid cooling mode; this continues until the current actual liquid level exceeds the medium setting and the current actual temperature T... tank Less than the set cooling temperature T set After being summed with the first temperature threshold c, the loop module restarts.

10. A temperature-controlled chiller water tank replenishment control system, using the temperature-controlled chiller water tank replenishment control method according to any one of claims 1-9, characterized in that, The system includes a data acquisition module, which comprises a temperature sensor and three level gauges at different heights. The data acquisition module transmits the acquired data to the control module, which then determines the appropriate level based on the current actual liquid level and temperature (T). tank Different control strategies can be selected; the control module controls the actuators to perform refrigeration and liquid replenishment control; the actuators include the refrigeration module, the liquid replenishment module, and the chiller's circulation module; the refrigeration module has a rapid cooling mode for fast cooling, and also an energy-saving mode to ensure basic cooling.

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