Refrigeration unit automatic control system and method

Abstract

The application provides a refrigerating unit automatic control system and method, and relates to the technical field of intelligent control of refrigerating systems.The system comprises a refrigerating unit control module, which is used for detecting the chilled water outlet temperature, comparing the chilled water outlet temperature with a target temperature range, and controlling the load increasing or load reducing electromagnetic valve to adjust the energy level of the compressor; an evaporative condenser control module, which is used for detecting the exhaust pressure, comparing the exhaust pressure with a target pressure range, and increasing or reducing the running number of the evaporative condenser fan and the water pump; a liquid supply adjusting module, which is used for detecting the liquid level of the flooded evaporator, and dynamically adjusting the opening degree of the liquid supply valve through a PID control algorithm; and an oil return control module, which is used for detecting the accumulation speed of oil in the oil separator, and optimizing the oil return rhythm by adjusting the power-on time and interval time of the oil return electromagnetic valve. Through modular design and intelligent control algorithm, the problems of energy consumption and equipment loss caused by temperature, pressure and liquid level fluctuations are avoided, and the reliability and operation efficiency of the refrigerating unit are improved.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent control of refrigeration systems, and in particular to an automatic control system and method for a refrigeration unit. Background Art

[0002] With the continuous advancement of industrialization and urbanization, refrigeration units are increasingly used in industrial production, the food cold chain, building air conditioning, and other fields. However, traditional refrigeration systems often rely on manual or simple mechanical control, which makes it difficult to cope with complex operating conditions and dynamic load demands. This leads to low system efficiency, severe energy waste, and frequent equipment failures. In particular, traditional control methods struggle to achieve efficient and stable operation when faced with complex operating conditions involving multiple coupled variables (such as temperature, pressure, and liquid level). Summary of the Invention

[0003] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the first purpose of this application is to propose an automatic control system for a refrigeration unit.

[0005] The second purpose of this application is to provide a refrigeration unit automatic control method.

[0006] The third objective of this application is to provide an electronic device.

[0007] The fourth object of this application is to provide a computer-readable storage medium.

[0008] A fifth object of this application is to provide a computer program product.

[0009] To achieve the above objectives, the first embodiment of the present application proposes a refrigeration unit automation control system, comprising:

[0010] The refrigeration unit control module is used to detect the chilled water outlet temperature and control the load increase or load reduction solenoid valve to adjust the energy level of the compressor by comparing it with the target temperature range;

[0011] The evaporative condenser control module is used to detect the exhaust pressure and increase or decrease the number of operations of the evaporative cooling fan and water pump by comparing it with the target pressure range;

[0012] Liquid supply adjustment module, used to detect the liquid level of the flooded evaporator and dynamically adjust the opening of the liquid supply valve through the PID control algorithm;

[0013] The oil return control module is used to detect the oil accumulation rate in the oil separator and optimize the oil return rhythm by adjusting the power-on time and interval time of the oil return solenoid valve.

[0014] Optionally, the refrigeration unit control module is used to:

[0015] Detect the actual value of the chilled water outlet temperature;

[0016] When the actual value of the outlet water temperature exceeds the upper limit of the target temperature range, the load-increasing solenoid valve is controlled to gradually increase the energy level of the compressor, wherein the upper limit of the target temperature range is the sum of the target value of the outlet water temperature and the adjustment deviation value;

[0017] When the actual value of the outlet water temperature is lower than the lower limit of the target temperature range, the load reduction solenoid valve is controlled to gradually reduce the energy level of the compressor, wherein the lower limit of the target temperature range is the difference between the target value of the outlet water temperature and the adjustment deviation value;

[0018] When the actual value of the outlet water temperature is within the target temperature adjustment range, the current energy level of the compressor is kept unchanged.

[0019] Optionally, the evaporative condenser control module is used to:

[0020] Detect exhaust pressure and obtain current pressure value;

[0021] When the current pressure value is higher than or equal to the upper limit of the target pressure range and the duration exceeds the set time, the number of running evaporative cooling fans or water pumps is gradually increased through an incremental adjustment strategy, wherein the target pressure upper limit is the sum of the target pressure value and the pressure deviation value;

[0022] When the current pressure value is lower than or equal to the target pressure lower limit and lasts for more than a set time, the number of operations of the evaporative cooling fan or water pump is gradually reduced through a subtraction adjustment strategy, wherein the target pressure lower limit is the difference between the target pressure value and the pressure deviation value;

[0023] When the current pressure value is within the target pressure range, the number of existing equipment is maintained unchanged.

[0024] Optionally, each time an increase or decrease adjustment action is completed, a delay of c seconds is maintained to re-detect the pressure value, and the adjustment direction is determined again to execute the corresponding increase or decrease adjustment action.

[0025] Optionally, the incremental adjustment strategy executed by the evaporative condenser control module includes:

[0026] When it is determined that the number of fans or water pumps in operation needs to be increased, a group of devices is selected from the device group of the evaporative cooling device in a polling order as the start-up object;

[0027] All devices in the group are sorted by cumulative running time and started according to the following rules: start the water pump first, and then start the fan after all water pumps in the group have started. For devices of the same type, the device with the shortest running time is started first. If multiple fans have the same running time, the fan with the smallest sequence number is started first. Set a delay of a second between device starts.

[0028] After all devices in the group have been started up, if the adjustment direction is still determined to be increasing, the second group will be polled and all devices in the second group will be started in sequence according to the same rules until all devices in all groups are put into operation. If all devices in a group have been started up and the adjustment direction is determined to be maintaining or decreasing, subsequent actions will be executed according to the quantity maintaining or decreasing adjustment strategy.

[0029] When a device in a group is in a faulty state, the device is removed from the sequence of alternative devices to be put into use.

[0030] Optionally, the subtraction adjustment strategy executed by the evaporative condenser control module includes:

[0031] When it is determined that the number of fans or water pumps in operation needs to be increased, a group of devices is selected from the evaporative cooling device group in the order of first start, first stop as the shutdown target;

[0032] All devices in the group are sorted by cumulative running time and shut down according to the following rules: first shut down the fans, and then shut down the water pumps after all fans in the group have shut down. For devices of the same type, shut down the device with the longest running time first. If multiple fans have the same running time, shut down the fan with the largest sequence number first. Set a delay of a second between device shutdowns.

[0033] Optionally, the liquid supply regulating module is used to:

[0034] Detect the liquid level of the flooded evaporator and obtain the current liquid level value;

[0035] When the current liquid level value is lower than the lower limit of the target liquid level range, the opening of the liquid supply valve is increased through the PID control algorithm to raise the liquid level;

[0036] When the current liquid level value is higher than the upper limit of the target liquid level range, the opening of the liquid supply valve is reduced by the PID control algorithm to lower the liquid level;

[0037] When the current liquid level value is within the target liquid level range, the existing opening of the liquid supply valve is kept unchanged to ensure stable operation of the system.

[0038] Optionally, the oil return control module is used to:

[0039] Detect the oil level change in the oil separator and obtain the current oil level value;

[0040] When the current oil level reaches the set oil return trigger condition, the oil return solenoid valve is opened, and the oil return rate is controlled by adjusting the power-on time and interval time of the solenoid valve;

[0041] When the current oil volume value does not reach the set oil return trigger condition, the oil return solenoid valve is kept closed to avoid pressure fluctuations caused by excessive oil return in the system.

[0042] To achieve the above-mentioned purpose, a second embodiment of the present application proposes a refrigeration unit automatic control method, comprising:

[0043] Detect the chilled water outlet temperature and control the load-in or load-out solenoid valve to adjust the compressor energy level by comparing it with the target temperature range;

[0044] Detect the exhaust pressure and increase or decrease the number of evaporative cooling fans and water pumps running by comparing it with the target pressure range;

[0045] Detect the liquid level of the flooded evaporator and dynamically adjust the opening of the liquid supply valve through the PID control algorithm;

[0046] Detect the oil accumulation rate in the oil separator and optimize the oil return rhythm by adjusting the energizing time and interval time of the oil return solenoid valve.

[0047] To achieve the above-mentioned purpose, a third embodiment of the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0048] The memory stores computer-executable instructions;

[0049] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the second aspects.

[0050] To achieve the above-mentioned purpose, the fourth embodiment of the present application proposes a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, they are used to implement the method as described in any one of the second aspects.

[0051] To achieve the above-mentioned purpose, the fifth embodiment of the present application proposes a computer program product, which implements any one of the methods in the second aspect when executed by a processor.

[0052] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0053] Through the coordinated work of the refrigeration unit control module, evaporative condenser control module, liquid supply regulation module and oil return control module, dynamic and precise regulation of temperature, pressure, liquid level and oil volume is achieved, ensuring the efficient operation of the system and avoiding the problems of increased energy consumption, increased equipment wear and unstable operation caused by control lag in traditional systems. The energy saving, reliability and service life of the refrigeration unit are improved, and the diversified refrigeration needs under complex working conditions are met.

[0054] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0056] Figure 1 A block diagram of an automatic control system for a refrigeration unit provided in an embodiment of the present application;

[0057] Figure 2 This is an operating status monitoring diagram of the refrigeration unit provided in the embodiment of the present application;

[0058] Figure 3 This is the evaporative cooling operation status monitoring screen provided by the embodiment of the present application;

[0059] Figure 4 A schematic diagram of the settings of the operating parameters and protection parameters provided in the embodiment of the present application;

[0060] Figure 5 A schematic diagram of the settings of the operating parameters and protection parameters provided in the embodiment of the present application;

[0061] Figure 6 A schematic diagram of an alarm interface provided in an embodiment of the present application;

[0062] Figure 7 This is a temperature trend diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0064] In response to the problems existing in the prior art, an embodiment of the present application provides an automatic control system for a refrigeration unit. Figure 1A block diagram of an automatic control system of a refrigeration unit provided by an embodiment of the present application, comprising:

[0065] A refrigeration unit control module 1 for detecting chilled water outlet temperature and controlling load increase or decrease electromagnetic valve to adjust the power level of the compressor by comparing with the target temperature range;

[0066] An evaporative condenser control module 2 for detecting exhaust pressure and increasing or decreasing the number of evaporative condenser fan and water pump operation by comparing with the target pressure range;

[0067] A liquid supply adjustment module 3 for detecting the liquid level of the flooded evaporator and dynamically adjusting the opening of the liquid supply valve by PID control algorithm;

[0068] An oil return control module 4 for detecting the accumulation speed of oil in the oil separator and optimizing the oil return rhythm by adjusting the power-on time and interval time of the oil return electromagnetic valve.

[0069] Firstly, the automatic control system of the refrigeration unit of the present application includes two main controlled objects: refrigeration unit and evaporative condenser. The refrigeration unit is the core component of the system, and its main power-consuming equipment includes main motor, oil pump motor, oil separation electric heater, main motor heater and various electromagnetic valves. The device configuration and parameters are shown in Table 1.

[0070] Table 1

[0071]

[0072]

[0073] As an auxiliary device in the system, the evaporative condenser works cooperatively with the cooling fan and the cooling water pump to realize efficient adjustment of the exhaust pressure. The specific device parameters are shown in the table.

[0074] Table 2

[0075]

[0076] In addition, Figure 2 A running state monitoring diagram of the refrigeration unit provided by an embodiment of the present application; Figure 3 An evaporative cooling running state monitoring diagram provided by an embodiment of the present application; Figure 4 A setting diagram of running parameters and protection parameters provided by an embodiment of the present application; Figure 5 A setting diagram of running parameters and protection parameters provided by an embodiment of the present application.

[0077] Through detailed management and intelligent control of the above two types of controlled objects, the refrigeration unit automation control system of this application can dynamically respond to complex working conditions, achieve efficient, energy-saving and stable operation status, and significantly improve the defects in the existing technology.

[0078] In the embodiment of the present application, the refrigeration unit control module 1 is intended to dynamically adjust the energy level of the compressor by real-time detection of the actual value of the chilled water outlet temperature, thereby achieving rapid adaptive regulation of the outlet water temperature and ensuring efficient operation of the refrigeration system.

[0079] In the embodiment of the present application, the refrigeration unit control module 1 is specifically used to:

[0080] First, based on the target value of the chilled water outlet temperature and the set adjustment deviation value, the upper and lower limits of the control range are determined, so as to perform the judgment logic for the subsequent adjustment direction. The upper and lower limits of the control range are:

[0081] Upper limit of target temperature range = [target value of chilled water outlet temperature] + [adjustment deviation value]

[0082] Lower limit of target temperature range = [chilled water outlet temperature target value] - [adjustment deviation value]

[0083] Then, the actual value of the chilled water outlet temperature is detected and the following logical judgment is performed:

[0084] (1) When the actual value of the outlet water temperature exceeds the upper limit of the target temperature range, the system triggers the load increase control and controls the load increase solenoid valve to gradually increase the energy level of the compressor;

[0085] (2) When the actual value of the outlet water temperature is lower than the lower limit of the target temperature range, the system triggers the load reduction control and controls the load reduction solenoid valve to gradually reduce the energy level of the compressor;

[0086] (3) When the actual value of the outlet water temperature is within the target temperature adjustment range, that is, when the actual value of the outlet water temperature is between the lower limit of the target temperature range and the upper limit of the target temperature range, the system maintains the current compressor energy level unchanged to avoid frequent adjustments that may cause system instability.

[0087] In addition, the load increase and decrease adjustment process is realized through the dynamic operation of the solenoid valve group, and the following process is performed: the load increase (load reduction) solenoid valve group is energized, and the compressor starts to increase (reduce) the energy level, and the duration is [automatic load increase (load reduction) time]; the solenoid valve group loses power, the compressor stops increasing (decreasing) the load, and waits for a period of [automatic load increase (load reduction) interval time]; the solenoid valve group is energized again and repeats the load increase (load reduction) action.

[0088] The above actions are repeated until it is detected that the actual temperature value returns to the adjustment range, that is, the load increase (load reduction) condition is not met, and the system automatically stops the load increase (load reduction) operation.

[0089] In an embodiment of the present application, all evaporative condensers in a system (6 for the medium-temperature system and 3 for the low-temperature system) are grouped according to the equipment in a single evaporative cooling system (i.e., 5 fans and 2 water pumps are grouped together). As the compressor starts and increases in load, the pressure on the exhaust manifold will gradually increase. At this time, more entire groups of equipment or part of the equipment in a group need to be invested to control the pressure value to maintain it within a certain safe range and not increase it. The more fans and water pumps are invested, the lower the pipeline pressure value. The evaporative condenser control module 2 is designed to maintain the exhaust pressure within a preset range by dynamically regulating the operating status of the evaporative cooling fan and water pump, thereby ensuring the stable operation of the system, balancing the operating time of each device, and extending the service life of the equipment. Its control goal is to dynamically adjust the number of operating evaporative cooling fans and water pumps under the premise of ensuring the stability of the exhaust pressure, try to balance the operating time of each device, reduce wear, and improve equipment reliability.

[0090] In the embodiment of the present application, the evaporative condenser control module 2 is specifically used to:

[0091] First, the exhaust pressure is detected in real time and the current pressure value is obtained as the control basis.

[0092] Then the adjustment direction is judged: when the current pressure value is higher than or equal to the upper limit of the target pressure range and the duration exceeds the set time, the operating number of the evaporative cooling fan or water pump is gradually increased through the increasing adjustment strategy; when the current pressure value is lower than or equal to the lower limit of the target pressure and the duration exceeds the set time, the operating number of the evaporative cooling fan or water pump is gradually reduced through the decreasing adjustment strategy; when the current pressure value is within the target pressure range, that is, the current pressure is between the lower limit of the target pressure and the upper limit of the target pressure, the number of existing equipment is maintained unchanged.

[0093] It should be noted that the target pressure upper limit is the sum of the target pressure value and the pressure deviation value, while the target pressure lower limit is the difference between the target pressure value and the pressure deviation value. Furthermore, the target pressure value is the equilibrium pressure value that the pipeline pressure is expected to reach (this value can be set on the screen), and the pressure deviation value is the range of fluctuations above and below the target pressure value (this value can also be set on the screen).

[0094] It is understandable that the target pressure value, pressure deviation value and set time all need to be set according to the actual scenario, and this application does not make specific limitations on this.

[0095] In addition, after each increment or decrement adjustment, the system delays for c seconds to re-check the pressure value, re-determine the adjustment direction, and execute the corresponding increment or decrement adjustment action, repeating the cycle. The value of c can be set according to the actual scenario and is not specifically limited in this application.

[0096] Specifically, the incremental adjustment strategy executed by the evaporative condenser control module 2 includes:

[0097] When it is determined that the number of fans or pumps needs to be increased, a group of devices is selected from the evaporative cooling device group in a round-robin order as the startup targets. All devices in the group are sorted by cumulative running time and started according to the following rules:

[0098] (1) Start the water pump first, and then start the fan after all water pumps in the group have started.

[0099] (2) For devices of the same type, the device with the shortest running time shall be started first;

[0100] (3) If the running time of multiple fans is the same, the fan with the smaller serial number will be started first;

[0101] (4) Set a delay of a seconds between device startups.

[0102] The value of a can be set according to the actual scenario, and this application does not make any specific restrictions on this.

[0103] In one embodiment of the present application, after determining that the adjustment direction is incremental adjustment, one group is first selected from the 6 groups (3 groups) of the medium temperature (low temperature) system in a polling order to prepare for startup, and all the equipment in the group is started in sequence in the following order: first start a water pump in the selected group, and then start the second water pump in the group after a delay of a second (settable), and then start the fan with the shortest running time in the group after a delay of a second (settable)... until all the equipment in this group is started.

[0104] In addition, after all devices in the group have been started up, if it is determined that the adjustment direction is still incremental adjustment, the second group will be selected in turn, and all devices in the second group will be started in sequence according to the same rules, and then the third group... the fourth group... until all devices in all groups are put into operation.

[0105] When a device in a group is in a faulty state, the device is removed from the sequence of alternatives to be put into operation, and the cumulative operating time of each device is kept as balanced as possible.

[0106] If all devices in a group are started up and the adjustment direction is determined to be maintain or reduce, subsequent actions are executed according to the quantity maintain or reduce adjustment strategy.

[0107] Specifically, the subtraction adjustment strategy executed by the evaporative condenser control module 2 includes:

[0108] When it is determined that the number of fans or pumps in operation needs to be increased, a group of devices in the evaporative cooling equipment group is selected as the shutdown target in the order of first start, first stop. All devices in the group are sorted by cumulative operating time and shut down according to the following rules:

[0109] (1) Stop the fan first, and then stop the water pump after all fans in the group have stopped.

[0110] (2) For equipment of the same type, equipment with longer downtime shall be given priority;

[0111] (3) If the running time of multiple fans is the same, the fan with the largest number will be shut down first according to the fan number;

[0112] (4) Set a delay of a seconds between equipment shutdowns.

[0113] The value of a can be set according to the actual scenario, and this application does not make any specific restrictions on this.

[0114] In one embodiment of the present application, when it is determined that the adjustment direction is subtraction adjustment, among the 6 groups (3 groups) in the medium temperature (low temperature) system, each major group performs a shutdown procedure in the order of first start first stop, and the equipment in each group is shut down in the following order: first stop the fan with the longest running time in the group, and then stop the fan with the second longest running time in the group after a delay of a seconds (settable), and then the third fan... until all fans are stopped, and the 2 water pumps in the group also perform a shutdown procedure in the order of first start first stop, until all equipment in this group is shut down.

[0115] It's understandable that the wider the liquid supply regulating valve opening, the higher the liquid level in the gas-liquid separator, improving the evaporator's heat exchange and accelerating the water temperature drop. However, a higher liquid level also increases the chance of liquid carryover in the compressor's intake air, and vice versa. Therefore, the target value for liquid level control presents a contradiction in actual regulation. Based on actual operating conditions, an optimal liquid level, balanced between cooling efficiency and liquid carryover, must be selected as the control target for the regulating valve opening to maximize the refrigeration unit's cooling efficiency while maintaining safety.

[0116] In this embodiment, the liquid supply control module 3 is used to dynamically monitor and adjust the liquid level of the flooded evaporator. By controlling the opening of the liquid supply control valve, the liquid level is maintained within the target range, achieving stable system operation and optimal cooling performance. Its control objectives are to dynamically adjust the opening of the liquid supply valve based on the liquid level of the flooded evaporator through a self-tuning PID control algorithm, achieving the following goals while ensuring safety:

[0117] 1. Improve heat exchange effect: By controlling the liquid level, the heat exchange efficiency of the evaporator is optimized and the cooling of the chilled water is accelerated.

[0118] 2. Prevent liquid from being sucked into the air: Avoid excessive liquid level causing the compressor to suck liquid into the air, thus protecting the system safety.

[0119] Specifically, the liquid supply regulating module 3 is used to:

[0120] First, the liquid level of the flooded evaporator is detected in real time to obtain the current liquid level value as the benchmark for liquid supply adjustment.

[0121] Then the liquid level is judged. When the current liquid level value is lower than the lower limit of the target liquid level range, the system increases the opening of the liquid supply valve through the PID control algorithm, and increases the liquid supply to raise the liquid level; when the current liquid level value is higher than the upper limit of the target liquid level range, the system reduces the opening of the liquid supply valve through the PID control algorithm, and reduces the liquid supply to lower the liquid level; when the current liquid level value is within the target liquid level range, the existing opening of the liquid supply valve is kept unchanged to ensure stable operation of the system.

[0122] In the embodiment of the present application, the oil return control module 4 is mainly used to dynamically adjust the oil return process of the oil separator in the system. By reasonably controlling the opening and closing state of the oil return solenoid valve, the stable operation of the system is ensured to avoid pressure fluctuations or operational failures caused by oil return problems.

[0123] Specifically, the oil return control module 4 is used to:

[0124] First, the oil volume changes in the oil separator are detected in real time to obtain the current oil volume value as a control basis.

[0125] Then the oil return trigger condition is judged: when the oil volume value reaches the set oil return trigger condition, the system opens the oil return solenoid valve, starts the oil return process, and controls the oil return rate by adjusting the power-on time and interval time of the solenoid valve. According to the system operation situation, the operator can optimize the power-on and interval time parameters to match the best operation rhythm; when the current oil volume value does not reach the set oil return trigger condition, the oil return solenoid valve is kept closed to avoid excessive oil return in the system causing pressure fluctuations.

[0126] In addition, the refrigeration unit automation control system of this application is designed with an alarm function to monitor the system operation status in real time, record and remind abnormal situations, and ensure the safe operation of the equipment. The alarm function is divided into two parts: current alarm record and historical alarm record, and involves the alarm object name and corresponding alarm description, such as Figure 7 shown.

[0127] In addition, the refrigeration unit automation control system of this application also shows the changing trends of multiple key temperature parameters during the operation of the system, such as Figure 7As shown in the figure, the temperature trends include suction temperature (curve a), discharge temperature (curve b), oil supply temperature (curve c), and water outlet temperature (curve d). Through the temperature trend chart, the system can achieve dynamic monitoring, abnormality identification, and performance optimization, providing strong support for the efficient operation of the refrigeration unit.

[0128] It can be seen that there is no obvious mutation in the four temperature curves, indicating that the system is running stably and the coordinated control effect of each module is good; the fluctuation of exhaust temperature and oil supply temperature within a certain range may be related to the load increase or load reduction of the compressor, which is a normal phenomenon; the outlet water temperature continues to drop, indicating that the evaporator heat exchange efficiency is high and the chilled water cooling effect is significant.

[0129] In order to implement the above embodiment, the present application also proposes a refrigeration unit automatic control method, comprising the following steps:

[0130] Step S1: Detecting the chilled water outlet temperature and controlling the load-increasing or load-reducing solenoid valve to adjust the energy level of the compressor by comparing it with the target temperature range;

[0131] Step S2: detecting the exhaust pressure and increasing or decreasing the number of evaporative cooling fans and water pumps in operation by comparing it with the target pressure range;

[0132] Step S3: detecting the liquid level of the flooded evaporator and dynamically adjusting the opening of the liquid supply valve through a PID control algorithm;

[0133] Step S4: Detect the oil accumulation speed in the oil separator, and optimize the oil return rhythm by adjusting the energizing time and interval time of the oil return solenoid valve.

[0134] The specific implementation and principles of the above method have been detailed in the relevant system modules and will not be repeated here. Through this method, the modules work together to achieve precise control of temperature, pressure, liquid level, and oil return, ensuring efficient and stable operation of the refrigeration unit.

[0135] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0136] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0137] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0138] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0139] It is important to note that personal information collected from users should be used for legitimate and reasonable purposes and should not be shared or sold beyond these legitimate uses. Furthermore, such collection / sharing should be conducted only after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign an agreement / authorization that includes the relevant user information before using the feature. Furthermore, any necessary steps must be taken to safeguard and secure access to such personal information and ensure that others with access to personal information comply with its privacy policy and procedures.

[0140] This application contemplates providing implementations that allow users to selectively block the use or access of personal information data. Specifically, this disclosure contemplates providing hardware and / or software to prevent or block access to such personal information data. Risks can be minimized by limiting data collection and deleting data once it is no longer needed. Furthermore, where applicable, such personal information can be de-identified to protect user privacy.

[0141] In the descriptions of the foregoing embodiments, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0142] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0143] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0144] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0145] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0146] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0147] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0148] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

[0149] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

[0150] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A refrigeration unit automatic control system, characterized in that: include: The refrigeration unit control module is used to detect the chilled water outlet temperature and control the load increase or load reduction solenoid valve to adjust the energy level of the compressor by comparing it with the target temperature range; The evaporative condenser control module is used to detect the exhaust pressure and increase or decrease the number of operations of the evaporative cooling fan and water pump by comparing it with the target pressure range; Liquid supply adjustment module, used to detect the liquid level of the flooded evaporator and dynamically adjust the opening of the liquid supply valve through the PID control algorithm; The oil return control module is used to detect the oil accumulation rate in the oil separator and optimize the oil return rhythm by adjusting the energization time and interval time of the oil return solenoid valve; The evaporative condenser control module is used to: Detect exhaust pressure and obtain current pressure value; When the current pressure value is higher than or equal to the upper limit of the target pressure range and the duration exceeds the set time, the number of running evaporative cooling fans or water pumps is gradually increased through an incremental adjustment strategy, wherein the target pressure upper limit is the sum of the target pressure value and the pressure deviation value; When the current pressure value is lower than or equal to the target pressure lower limit and lasts for more than a set time, the number of operations of the evaporative cooling fan or water pump is gradually reduced through a subtraction adjustment strategy, wherein the target pressure lower limit is the difference between the target pressure value and the pressure deviation value; When the current pressure value is within the target pressure range, the number of existing devices is maintained unchanged; The incremental adjustment strategy executed by the evaporative condenser control module includes: When it is determined that the number of fans or water pumps in operation needs to be increased, a group of devices is selected from the device group of the evaporative cooling device in a polling order as the start-up object; All devices in the group are sorted by cumulative running time and started according to the following rules: start the water pump first, and then start the fan after all water pumps in the group have started. For devices of the same type, the device with the shortest running time is started first. If multiple fans have the same running time, the fan with the smallest sequence number is started first. Set a delay of a second between device starts. After all devices in the group have been started up, if the adjustment direction is still determined to be increasing, the second group will be polled and all devices in the second group will be started in sequence according to the same rules until all devices in all groups are put into operation. If all devices in a group have been started up and the adjustment direction is determined to be maintaining or decreasing, subsequent actions will be executed according to the quantity maintaining or decreasing adjustment strategy. When a device in a group is in a faulty state, the device is removed from the sequence of alternative devices to be put into use.

2. The system according to claim 1, wherein: The refrigeration unit control module is used to: Detect the actual value of the chilled water outlet temperature; When the actual value of the outlet water temperature exceeds the upper limit of the target temperature range, the load-increasing solenoid valve is controlled to gradually increase the energy level of the compressor, wherein the upper limit of the target temperature range is the sum of the target value of the outlet water temperature and the adjustment deviation value; When the actual value of the outlet water temperature is lower than the lower limit of the target temperature range, the load reduction solenoid valve is controlled to gradually reduce the energy level of the compressor, wherein the lower limit of the target temperature range is the difference between the target value of the outlet water temperature and the adjustment deviation value; When the actual value of the outlet water temperature is within the target temperature adjustment range, the current energy level of the compressor is kept unchanged.

3. The system according to claim 1, wherein: After each increase or decrease adjustment action is completed, the delay The pressure value is re-detected every second, and the adjustment direction is determined again, and the corresponding increase or decrease adjustment action is performed.

4. The system according to claim 1, wherein: The subtraction adjustment strategy executed by the evaporative condenser control module includes: When it is determined that the number of fans or water pumps in operation needs to be increased, a group of devices is selected from the evaporative cooling device group in the order of first start, first stop as the shutdown target; All devices in the group are sorted by cumulative running time and shut down according to the following rules: first shut down the fans, and then shut down the water pumps after all fans in the group have shut down. For devices of the same type, shut down the device with the longest running time first. If multiple fans have the same running time, shut down the fan with the largest sequence number first. Set a delay of a second between device shutdowns.

5. The system according to claim 1, wherein: The liquid supply regulating module is used to: Detect the liquid level of the flooded evaporator and obtain the current liquid level value; When the current liquid level value is lower than the lower limit of the target liquid level range, the opening of the liquid supply valve is increased through the PID control algorithm to raise the liquid level; When the current liquid level value is higher than the upper limit of the target liquid level range, the opening of the liquid supply valve is reduced by the PID control algorithm to lower the liquid level; When the current liquid level value is within the target liquid level range, the existing opening of the liquid supply valve is kept unchanged to ensure stable operation of the system.

6. The system according to claim 1, wherein: The oil return control module is used to: Detect the oil level change in the oil separator and obtain the current oil level value; When the current oil level reaches the set oil return trigger condition, the oil return solenoid valve is opened, and the oil return rate is controlled by adjusting the power-on time and interval time of the solenoid valve; When the current oil volume value does not reach the set oil return trigger condition, the oil return solenoid valve is kept closed to avoid pressure fluctuations caused by excessive oil return in the system.

7. A refrigeration unit automation control method, characterized in that: include: Detect the chilled water outlet temperature and control the load-in or load-out solenoid valve to adjust the compressor energy level by comparing it with the target temperature range; Detect the exhaust pressure and increase or decrease the number of evaporative cooling fans and water pumps running by comparing it with the target pressure range; Detect the liquid level of the flooded evaporator and dynamically adjust the opening of the liquid supply valve through the PID control algorithm; Detect the oil accumulation rate in the oil separator and optimize the oil return rhythm by adjusting the energizing time and interval time of the oil return solenoid valve; The method of detecting the exhaust pressure and increasing or decreasing the number of operations of the evaporative cooling fan and the water pump by comparing the exhaust pressure with the target pressure range includes: Detect exhaust pressure and obtain current pressure value; When the current pressure value is higher than or equal to the upper limit of the target pressure range and the duration exceeds the set time, the number of running evaporative cooling fans or water pumps is gradually increased through an incremental adjustment strategy, wherein the target pressure upper limit is the sum of the target pressure value and the pressure deviation value; When the current pressure value is lower than or equal to the target pressure lower limit and lasts for more than a set time, the number of operations of the evaporative cooling fan or water pump is gradually reduced through a subtraction adjustment strategy, wherein the target pressure lower limit is the difference between the target pressure value and the pressure deviation value; When the current pressure value is within the target pressure range, the number of existing devices is maintained unchanged; The incremental adjustment strategy includes: When it is determined that the number of fans or water pumps in operation needs to be increased, a group of devices is selected from the device group of the evaporative cooling device in a polling order as the start-up object; All devices in the group are sorted by cumulative running time and started according to the following rules: start the water pump first, and then start the fan after all water pumps in the group have started. For devices of the same type, the device with the shortest running time is started first. If multiple fans have the same running time, the fan with the smallest sequence number is started first. Set a delay of a second between device starts. After all devices in the group have been started up, if the adjustment direction is still determined to be increasing, the second group will be polled and all devices in the second group will be started in sequence according to the same rules until all devices in all groups are put into operation. If all devices in a group have been started up and the adjustment direction is determined to be maintaining or decreasing, subsequent actions will be executed according to the quantity maintaining or decreasing adjustment strategy. When a device in a group is in a faulty state, the device is removed from the sequence of alternative devices to be put into use.

8. An electronic device, characterized in that: include: a processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to claim 7.

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