Automatic control system and method for refrigerating unit

Abstract

The invention provides an automatic control system and method for a refrigerating unit, and relates to the technical field of intelligent control of refrigerating systems.The system comprises a refrigerating unit control module used for detecting the chilled water outlet temperature and controlling a load increasing or load reducing electromagnetic valve to adjust the energy level of a compressor by comparing the chilled water outlet temperature with a target temperature range; the evaporative condenser control module is used for detecting exhaust pressure and increasing or decreasing the operation number of the evaporative air coolers and the water pumps by comparing the exhaust pressure with a target pressure range; the liquid supply adjusting module is used for detecting the liquid level of the flooded evaporator and dynamically adjusting the opening degree of a liquid supply valve through a PID control algorithm; and the oil return control module 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 the interval time of an oil return electromagnetic valve. And through modular design and an intelligent control algorithm, the problems of energy consumption and equipment loss caused by temperature, pressure and liquid level fluctuation are avoided, and the reliability and the 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, food cold chain, building air conditioning and other fields. However, traditional refrigeration systems usually rely on manual or simple mechanical control, which is difficult to cope with complex operating conditions and dynamic load requirements, resulting in low system efficiency, serious energy waste, and frequent equipment failures. In particular, when faced with complex working conditions with multi-variable coupling (such as temperature, pressure, liquid level, etc.), traditional control methods are difficult to achieve efficient and stable operation. Summary of the invention

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

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

[0005] The second objective of the present application is to provide an automatic control method for a refrigeration unit.

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

[0007] A fourth objective of the present application is to provide a computer-readable storage medium.

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

[0009] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a refrigeration unit automatic control system, including:

[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 operation quantity of the evaporative cooling fan and the water pump by comparing it with the target pressure range;

[0012] Liquid supply regulating module, used to detect the liquid level of the full-liquid 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 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.

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

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

[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 of the chilled water 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 of the chilled water 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 invested equipment is maintained unchanged.

[0024] Optionally, each time an increase or decrease adjustment action is completed, the pressure value is re-detected after a delay of c seconds, 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 seconds between starting devices.

[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 selected in turn, 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, the 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 equipment is selected from the equipment group of the evaporative cooling equipment in the order of first start first stop as the shutdown object;

[0032] All equipment in the group are sorted by cumulative running time, and shut down according to the following rules: shut down the fan first, and then shut down the water pump after all fans in the group have been shut down; for equipment of the same type, shut down the equipment with the longest running time first; if multiple fans have the same running time, shut down the fan with the larger serial number first; set a delay of a seconds between shutting down equipment.

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

[0034] Detect the liquid level of the full-liquid 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 increase 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 through 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 change of oil volume in the oil separator and obtain the current oil volume value;

[0040] When the current oil volume value 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 excessively fast oil return in the system.

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

[0043] Detect the chilled water outlet temperature and control the load-increasing or load-reducing solenoid valve to adjust the energy level of the compressor 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 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 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.

[0047] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: 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 aspect embodiment of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution 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 aspect of the present application proposes a computer program product, which implements any method in the second aspect when executed by a processor.

[0052] The technical solution provided by the embodiments of the present application brings 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 the 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 An operating status monitoring diagram of a refrigeration unit provided in an embodiment of the present application;

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

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

[0060] Figure 5 A schematic diagram of setting operating parameters and protection parameters provided in an 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 operation trend diagram provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] Embodiments of the present application are described in detail below, and examples of the embodiments 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 view of 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 a refrigeration unit automation control system provided in an embodiment of the present application includes:

[0065] The refrigeration unit control module 1 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;

[0066] The evaporative condenser control module 2 is used to detect the exhaust pressure and increase or decrease the operation quantity of the evaporative cooling fan and the water pump by comparing with the target pressure range;

[0067] Liquid supply regulating module 3, used to detect the liquid level of the full-liquid evaporator and dynamically adjust the opening of the liquid supply valve through the PID control algorithm;

[0068] The oil return control module 4 is used to detect the accumulation speed of oil 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.

[0069] First, the refrigeration unit automation control system of this application includes two main controlled objects: the refrigeration unit and the evaporative condenser. The refrigeration unit is the core component of the system, and its main power-consuming equipment includes the main motor, oil pump motor, oil separator electric heater, main motor heater and various solenoid valves. The equipment 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 in coordination with the cooling fan and the cold water pump to achieve efficient regulation of the exhaust pressure. The specific equipment parameters are shown in the table.

[0074] Table 2

[0075]

[0076] in addition, Figure 2 An operating status monitoring diagram of a refrigeration unit provided in an embodiment of the present application; Figure 3 This is the evaporative cooling operation status monitoring screen provided in the embodiment of the present application; Figure 4 A schematic diagram of setting operating parameters and protection parameters provided in an embodiment of the present application; Figure 5 A schematic diagram of the settings of operating parameters and protection parameters provided in an embodiment of the present application.

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

[0078] In the embodiment of the present application, the refrigeration unit control module 1 aims 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 for:

[0080] First, according to 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 of 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 = [target value of chilled water outlet temperature] - [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 (reducing) 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 the embodiment of the present application, all evaporative condensers in a system (6 in the medium temperature system and 3 in 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). With the startup and overload of the compressor, the pressure on the exhaust main pipe will gradually increase. At this time, more whole sets of equipment or part of the equipment in a group need to be invested to control the pressure value to maintain within a certain safe range and not increase upward. The more fans and water pumps are invested, the lower the pipeline pressure value. The evaporative condenser control module 2 aims 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 evaporative cooling fans and water pumps in operation, while ensuring the stability of the exhaust pressure, to balance the operating time of each device as much as possible, reduce wear, and improve equipment reliability.

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

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

[0092] Then the adjustment direction is determined: 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 coolers or water pumps is gradually increased through an 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 number of running evaporative coolers or water pumps is gradually reduced through a 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 upper limit of the target pressure is the sum of the target pressure value and the pressure deviation value, and the lower limit of the target pressure is the difference between the target pressure value and the pressure deviation value. In addition, the target pressure value is the balance point pressure value that the pressure on the pipeline can 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 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 any specific limitations on this.

[0095] In addition, after each increase or decrease adjustment action is completed, the system delays for c seconds to re-detect the pressure value, and determines the adjustment direction again, and executes the corresponding increase or decrease adjustment action, and so on. The c value can be set according to the actual scenario, and this application does not make specific restrictions on this.

[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 water pumps 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 according to the cumulative running time and started according to the following rules:

[0098] (1) Start the water pump first, and then start the fan after all the 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 multiple fans have the same running time, the fan with the smallest 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 limitations on this.

[0103] In one embodiment of the present application, when it is determined 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 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), and then start the fan with the second 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 the devices in the group have been started, if it is determined that the adjustment direction is still incremental adjustment, the second group will be selected in turn, and all the 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 the 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 use, and the accumulated running time of each device is kept balanced as much as possible.

[0106] If all devices in a group are started up and the adjustment direction is determined to be maintain or reduce, the 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 water pumps needs to be increased, a group of equipment is selected from the equipment group of the evaporative cooling equipment in the order of first start first stop as the shutdown object; all equipment in the group is sorted by the cumulative running time and shut down according to the following rules:

[0109] (1) First stop the fan, 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 multiple fans have the same operating time, the fan with the largest number will be shut down first;

[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 limitations on this.

[0114] In one embodiment of the present application, when it is determined that the adjustment direction is subtractive adjustment, among the 6 groups (3 groups) in the medium temperature (low temperature) system, each large 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, then stop the fan with the second longest running time in the group after a delay of a seconds (settable), and then stop the third fan... until all the 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 the equipment in this group is shut down.

[0115] It is understandable that the larger the opening of the liquid supply regulating valve, the higher the liquid level of the gas-liquid separator will be, the better the heat exchange effect of the evaporator, and the faster the water temperature will drop. However, at the same time, the higher the liquid level, the higher the probability of the compressor sucking liquid, and vice versa. Therefore, there is a contradiction in the target value of liquid level control in actual regulation. It is necessary to select an optimal liquid level height between the refrigeration effect and the suction liquid according to the actual operating conditions as the control target of the regulating valve opening, so as to maximize the refrigeration effect of the refrigeration unit under the premise of safety.

[0116] In the embodiment of the present application, the liquid supply regulating module 3 is used to dynamically monitor and regulate the liquid level of the flooded evaporator, and to ensure that the liquid level is maintained within the target range by controlling the opening of the liquid supply regulating valve, so as to achieve stable operation of the system and the best refrigeration effect. Its control target is to dynamically adjust the opening of the liquid supply valve according to the liquid level of the flooded evaporator through the self-tuning PID control algorithm, and achieve the following goals under the premise of 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 fully-filled evaporator is detected in real time to obtain the current liquid level value as a reference for liquid supply regulation.

[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] Firstly, the oil volume change in the oil separator is detected in real time to obtain the current oil volume value as the 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 conditions, 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 pressure fluctuations caused by excessive oil return in the system.

[0126] In addition, the refrigeration unit automation control system of this application is designed with an alarm function, which aims 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 object name of the alarm and the corresponding alarm description, such as Figure 7 shown.

[0127] In addition, the refrigeration unit automation control system of the present application also shows the changing trends of multiple key temperature parameters during the operation of the system, such as Figure 7As shown, it includes suction temperature (curve a), exhaust temperature (curve b), oil supply temperature (curve c) and water outlet temperature (curve d). Through the temperature operation trend chart, the system can realize 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 are no obvious mutations 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 operations of the evaporative cooling fan and the water pump by comparing it with the target pressure range;

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

[0133] Step S4, 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 solenoid valve.

[0134] The specific implementation content and principle of the above method have been elaborated in detail in the relevant system modules, and will not be repeated here. Through this method, each module works in coordination to achieve precise control of temperature, pressure, liquid level and oil return, providing efficient and stable operation guarantee for 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 should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0140] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0141] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 representations 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, without contradiction.

[0142] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0143] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment 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 not be performed in 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 technicians in the technical field to which the embodiments of the present application belong.

[0144] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, 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 in other suitable ways if necessary, and then stored in a computer memory.

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

[0146] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0147] In addition, each functional unit in each embodiment 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 one 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 can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0149] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0150] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope 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 operation quantity of the evaporative cooling fan and the water pump by comparing it with the target pressure range; Liquid supply regulating module, used to detect the liquid level of the full-liquid 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 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.

2. The system according to claim 1, characterized in that The refrigeration unit control module is used to: Detect the actual value of the outlet temperature of chilled water; 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 of the chilled water 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 of the chilled water 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, characterized in that 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 invested equipment is maintained unchanged.

4. The system according to claim 3, characterized in that After each increase or decrease adjustment action is completed, the pressure value is re-detected after a delay of c seconds, and the adjustment direction is determined again to execute the corresponding increase or decrease adjustment action.

5. The system according to claim 3, characterized in that 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 seconds between starting devices. 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 selected in turn, 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, the 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.

6. The system according to claim 3, characterized in that 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 equipment is selected from the equipment group of the evaporative cooling equipment in the order of first start first stop as the shutdown object; All equipment in the group are sorted by cumulative running time, and shut down according to the following rules: shut down the fan first, and then shut down the water pump after all fans in the group have been shut down; for equipment of the same type, shut down the equipment with the longest running time first; if multiple fans have the same running time, shut down the fan with the larger serial number first; set a delay of a seconds between shutting down equipment.

7. The system according to claim 1, characterized in that The liquid supply regulating module is used for: Detect the liquid level of the full-liquid 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 increase 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 through 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.

8. The method according to claim 1, characterized in that The oil return control module is used to: Detect the change of oil volume in the oil separator and obtain the current oil volume value; When the current oil volume value 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 excessively fast oil return in the system.

9. A refrigeration unit automatic control method, characterized in that: include: Detect the chilled water outlet temperature and control the load-increasing or load-reducing solenoid valve to adjust the energy level of the compressor 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 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 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.

10. 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 9.

Images