A method and system for controlling condensation of a backflow pipe and a double-system air-cooled refrigerator

Abstract

A kind of anti-condensation pipe condensation control method, system and double-system air-cooled refrigerator, comprising: obtaining the priority start system in refrigeration system and freezing system;Result priority start system first starts the bypass control valve of one system;Current has opened the bypass control valve of system as first bypass system, another system is rear bypass system;The time when predicted condensation risk of rear bypass system is higher than condensation threshold is as trigger time;If the difference between trigger time and the opening time of bypass control valve of first bypass system is less than or equal to control valve difference time threshold, then open the bypass control valve of rear bypass system before trigger time;Two different opening degree controls are selected based on the running time length of the bypass control valve of two systems;If the opening time length of the bypass control valve of system, the return air pipe temperature and the return air pipe temperature change rate meet the set exit condition, then gradually close the corresponding bypass control valve.The present application can reduce energy consumption while ensuring anti-condensation effect.

Description

Technical Field

[0001] This invention belongs to the field of refrigerator anti-condensation technology, and more specifically, relates to a method and system for controlling condensation in the return air pipe, as well as a dual-system air-cooled refrigerator. Background Technology

[0002] Dual-system air-cooled refrigerators (i.e., refrigerator and freezer compartments each equipped with independent evaporators, capillary tubes, and air ducts) have become the mainstream solution for mid-to-high-end refrigerators due to their advantages such as precise temperature control and prevention of odor mixing. However, their complex structure leads to the following technical problems: More severe condensation on the return pipes: The refrigerator and freezer systems have independent return pipes (refrigerator return pipe and freezer return pipe). During the initial startup of the refrigerator, both return pipes become "cold bridges" due to the low refrigerant temperature (usually <5℃), easily forming dual condensation sources inside the cabinet or compressor compartment, which is far more serious than in single-system refrigerators. Actual test data shows that in high ambient humidity, the condensation rate on the return pipes of dual-system refrigerators is high, often leading to safety hazards such as water accumulation in the compressor compartment, short circuits, and pipe corrosion. Existing technologies mostly use anti-condensation pipes (utilizing condensation heat) or electric heating strips, but anti-condensation pipes have limited heat and are difficult to cover both return pipes; electric heating strips have high energy consumption and pose an overheating risk. Furthermore, existing technologies propose bypass hot gas solutions, but existing control strategies cannot dynamically adjust the anti-condensation strategy according to the differences in the states of the two systems, resulting in low anti-condensation efficiency and an inability to coordinate the heat load distribution and asynchronous start-up and shutdown issues between the two systems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method and system for controlling condensation in the anti-return pipe, as well as a dual-system air-cooled refrigerator.

[0004] The present invention adopts the following technical solution.

[0005] The first aspect of the present invention provides a method for controlling condensation in a backflow prevention pipe, comprising: Based on the start-up time and return pipe temperature of the refrigeration and freezing systems, the priority start-up system in the refrigeration and freezing systems is determined. If the return pipe temperature of only one system in the refrigeration and freezing systems meets the set trigger condition, the bypass control valve of the corresponding system is opened. If the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start-up system is opened. The system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Based on the pre-trained machine learning model, the condensation risk of the two systems at each moment within the first set period is predicted. The moment when the condensation risk of the subsequent bypass system is higher than the set condensation threshold is taken as the trigger moment. If the difference between the trigger moment and the opening moment of the bypass control valve of the first bypass system is less than or equal to the set control valve difference time threshold, the bypass control valve of the subsequent bypass system is opened before the trigger moment. For all systems with open bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk. If the opening time of the bypass control valves of both the first and subsequent bypass systems exceeds the set third time threshold, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system every second set period. If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve will be gradually closed.

[0006] Preferably, the step of determining the priority start-up system among the refrigeration and freezing systems based on the start-up time and return pipe temperature of the refrigeration and freezing systems specifically involves: The system obtains the start-up time of the refrigeration system and the freezing system. If the absolute value of the difference between the start-up time of the refrigeration system and the freezing system is greater than the set system time difference threshold, the system that starts earlier is the priority start-up system. Otherwise, the system with the lower return pipe temperature is the priority start-up system.

[0007] Preferably, the triggering condition and the environmental condition are specifically: If the temperature of the return pipe of a system is less than or equal to the set return pipe temperature threshold, or if the valve flow rate reaches the set flow rate ratio for a duration exceeding the set duration threshold, then the parameters of the corresponding system are considered to have met the trigger conditions. If the ambient humidity is greater than or equal to the set humidity threshold, then the environmental parameters meet the environmental conditions.

[0008] Preferably, the pre-trained machine learning model predicts the condensation risk of the two systems at each time point within the first set period, specifically as follows: The machine learning model is a long short-term memory network; The ambient humidity, refrigeration return pipe temperature, refrigeration return pipe temperature, start-up time difference between the refrigeration and refrigeration systems, and start-up duration of the refrigeration and refrigeration systems within the set third cycle are all normalized and then input into the machine learning model to output the condensation risk of the two systems at each moment within the set first cycle.

[0009] Preferably, opening the bypass control valve of the bypass system before the triggering time specifically involves: If the difference between the trigger time and the opening time of the bypass control valve of the first bypass system is greater than or equal to the set advance opening time, then the bypass control valve of the second bypass system will be opened at the trigger time minus the advance opening time. Otherwise, immediately open the bypass control valve of the downstream bypass system.

[0010] Preferably, for the system with all open bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk, specifically as follows: For the bypass control valve of the bypass system, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the bypass system at the corresponding moment multiplied by the set control coefficient. For the bypass control valve of the downstream bypass system, if it is opened immediately, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient; if the bypass control valve of the downstream bypass system is opened at the moment of triggering minus the advance opening time, the opening degree of the bypass control valve from the moment the downstream bypass control valve is opened to the moment of triggering will always be equal to the condensation risk of the downstream bypass system at the moment of triggering multiplied by the set control coefficient; the opening degree at each moment after the moment of triggering is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient.

[0011] Preferably, the adjustment of the opening degree of the corresponding system based on the return gas pipe temperature of each system after each set second cycle is specifically as follows: For each system, after the set second cycle, the return gas pipe temperature of the corresponding system is read once. If the return gas pipe temperature of the corresponding system is greater than or equal to the set standard return gas pipe temperature, the current opening is maintained; otherwise, the opening of the corresponding bypass control valve is increased to the set first single-step opening. Preferably, if the system's bypass control valve opening duration, return pipe temperature, and return pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve is gradually closed, specifically: If the bypass control valve of the system has an opening duration greater than or equal to the set operating time threshold, and the return gas pipe temperature is greater than or equal to the set standard return gas pipe temperature, and the rate of change of the return gas pipe temperature is less than the set fluctuation threshold, then the opening degree of the corresponding bypass control valve is gradually reduced according to the set second single-step opening degree until the bypass control valve is closed.

[0012] Preferably, if the compressor exhaust pipe temperature is greater than the set overheat threshold, or if any of the open bypass control valves gives an abnormal feedback signal, or if any of the open bypass control valves, after a set opening time threshold, results in a temperature rise in the corresponding system's return pipe that is less than the set temperature rise threshold, then all bypass control valves are closed.

[0013] A second aspect of the present invention provides a backflow prevention pipe condensation control system based on the method described in the first aspect of the present invention, comprising: a priority start system identification module, a single system bypass module, a dual system collaborative control module, and an exit module, specifically: Priority Startup System Identification Module: Used to identify the priority startup system in the refrigeration and freezing systems based on the startup time and return pipe temperature of the refrigeration and freezing systems. Single system bypass module: If the return pipe temperature of only one system in the refrigeration system and the freezing system meets the set trigger condition, the bypass control valve of the corresponding system will be opened; if the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start system will be opened; the system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Dual-system collaborative control module: used to predict the condensation risk of the two systems at each moment within the first set period based on a pre-trained machine learning model; the moment when the condensation risk of the downstream bypass system is higher than the set condensation threshold is used as the trigger moment; if the difference between the trigger moment and the opening moment of the bypass control valve of the upstream bypass system is less than or equal to the set control valve difference time threshold, the bypass control valve of the downstream bypass system is opened before the trigger moment; for all systems with opened bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk; if the opening duration of the bypass control valves of both the upstream and downstream bypass systems exceeds the set third time threshold, then every second set period, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system; Exit Module: If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, the corresponding bypass control valve will be gradually closed.

[0014] A third aspect of the present invention provides a dual-system air-cooled refrigerator that integrates the anti-backflow condensation control system described in the second aspect of the present invention.

[0015] The beneficial effects of this invention are compared with those of the prior art: 1. This invention avoids a surge in system load caused by the simultaneous opening of bypass control valves in both systems by introducing a priority start-up system judgment, thus effectively saving energy. Based on machine learning to predict future condensation risks and accordingly control the timing of the subsequent bypass system's opening, it achieves a shift from passive response to proactive prevention, effectively suppressing condensation formation. Furthermore, after both system bypass valves have been open for a period of time, the method switches to periodic adjustment based on real-time return gas pipe temperature, reducing energy consumption while maintaining anti-condensation effectiveness. In addition, by setting multiple exit conditions, it ensures that the system can exit bypass mode promptly and smoothly after the condensation risk decreases, balancing safety and intelligent control levels.

[0016] 2. This invention utilizes the dual criteria of start-up time difference and return gas pipe temperature to prioritize the start-up of systems with lower return gas pipe temperatures. This allows for more accurate identification of the system with the highest condensation risk under the current operating conditions, thereby improving the targeting and effectiveness of anti-condensation control.

[0017] 3. The present invention uses a single-sided priority activation strategy, which is more energy-efficient than activating both sides simultaneously.

[0018] 4. This invention uses multidimensional data input to a Long Short-Term Memory (LSTM) network to predict condensation risk, which can make full use of the correlation information in the time series and ensure the accuracy of condensation risk prediction.

[0019] 5. This invention determines the time difference between the triggering time and the start time of the first bypass system by setting an advance start time, which ensures that the subsequent bypass system has sufficient warm-up or preparation time.

[0020] 6. The opening control implemented in this invention enables the valve opening to closely follow the predicted changes in risk level.

[0021] 7. After the dual system is running stably, the present invention is changed to periodic adjustment based on the temperature of the return gas pipe. When the temperature reaches the target, the opening is maintained; when the temperature does not reach the target, the opening is gradually increased. This step-by-step adjustment strategy not only ensures the stability of temperature control, but also simplifies the control algorithm, which is beneficial to engineering implementation.

[0022] 8. This invention considers multiple characteristics such as duration, temperature, and fluctuations to determine the exit process, and uses a gradual reduction in valve opening to close the valve, avoiding a sharp rebound in the temperature of the return pipe caused by rapid valve closure, thus ensuring a smooth and reliable system exit process.

[0023] 9. This invention integrates multiple safety redundancy mechanisms, including exhaust pipe overheat protection, valve feedback signal abnormality protection, and temperature rise effect evaluation protection. It can immediately terminate the bypass operation when the system malfunctions or the anti-condensation effect is poor, thus fully ensuring the operational safety and reliability of the refrigeration system.

[0024] 10. This invention achieves anti-condensation system design through a modular approach. Each module has a clearly defined function, enabling efficient and orderly execution of complex anti-condensation control strategies. It is also easy to integrate and deploy on existing refrigerator control platforms.

[0025] 11. This invention integrates the anti-condensation control system into a dual-system air-cooled refrigerator, which can effectively solve the technical problem of easy condensation on the refrigerator's return pipe in a high-temperature and high-humidity environment. Attached Figure Description

[0026] Figure 1 Diagram of the anti-condensation device for a dual-system air-cooled refrigerator; Figure 2 This is a flowchart of the method of the present invention; Figure 1 The attached figures are labeled as follows: refrigerated evaporator 1a, refrigerated return pipe 2a, refrigerated capillary tube 3a, refrigerated evaporator 1b, refrigerated return pipe 2b, refrigerated capillary tube 3b, compressor 4, compressor suction pipe 4c, compressor discharge pipe 5, first bypass pipe 6a, second bypass pipe 6b, first control valve 7a, second control valve 7b, refrigerated return pipe temperature and humidity sensor 8a, refrigerated return pipe temperature and humidity sensor 8b, tee 11, condenser 12, filter 13. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0028] like Figure 2 As shown, Embodiment 1 of the present invention proposes a method for controlling condensation in a backflow prevention pipe, comprising: After the refrigerator is powered on, all sensors and control valves are initialized, and data from each sensor is acquired. It should be noted that, as Figure 1As shown. The anti-condensation device of the dual-system air-cooled refrigerator of the present invention includes a refrigeration evaporator 1a, a refrigeration capillary tube 3a, a refrigeration return pipe 2a, a refrigeration return pipe temperature and humidity sensor 8a, a freezing evaporator 1b, a freezing capillary tube 3b, a freezing return pipe 2b, a freezing return pipe temperature and humidity sensor 8b, a compressor 4, a compressor exhaust pipe 5, a compressor suction pipe 4c, a condenser 12, a filter 13, a first bypass pipe 6a, a second bypass pipe 6b, a first control valve 7a, a second control valve 7b, and a tee 11; wherein, the evaporator corresponding to the refrigeration system is the refrigeration evaporator 1a, the corresponding return pipe is the refrigeration return pipe 2a, and the corresponding bypass control valve is the first control valve 7a; the evaporator corresponding to the freezing system is the freezing evaporator 1b, the corresponding return pipe is the freezing return pipe 2b, and the corresponding bypass control valve is the second control valve 7b. Based on the start-up time and return pipe temperature of the refrigeration and freezing systems, the priority start-up system in the refrigeration and freezing systems is obtained. If the return pipe temperature of only one system in the refrigeration system and the freezing system meets the set trigger condition, the bypass control valve of the corresponding system is opened; if the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start system is opened; the system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Based on the prediction of the condensation risk of the two systems at each moment within the first set period using a pre-trained machine learning model, the moment when the condensation risk of the downstream bypass system exceeds the set condensation threshold is taken as the trigger moment. If the difference between the trigger moment and the opening moment of the bypass control valve of the upstream bypass system is less than or equal to the set control valve difference time threshold, the bypass control valve of the downstream bypass system is opened before the trigger moment, and the opening degree of each bypass control valve is calculated based on the condensation risk. Otherwise, the bypass control valve of the downstream bypass system is not opened, and the bypass control valve of the upstream bypass system remains at its original opening degree. If the opening time of the bypass control valves of both the upstream and downstream bypass systems exceeds the set third time threshold, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system every second set period. In this embodiment, the third time threshold is set to 60s.

[0029] If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve will be gradually closed.

[0030] It should be noted that this embodiment avoids a surge in system load caused by the simultaneous opening of the bypass control valves of both systems by introducing a priority system start-up judgment, thus effectively saving energy. Based on machine learning to predict future condensation risks and accordingly control the timing of the subsequent bypass system's opening, a shift from passive response to proactive prevention is achieved, effectively suppressing condensation formation. Furthermore, after both system bypass valves have been open for a period of time, this method switches to periodic adjustment based on real-time return gas pipe temperature, reducing energy consumption while maintaining anti-condensation effectiveness. In addition, by setting multiple exit conditions, it ensures that the system can exit bypass mode promptly and smoothly after the condensation risk decreases, balancing safety and intelligent control levels.

[0031] In this preferred embodiment, the step of determining the priority start-up system between the refrigeration and freezing systems based on the start-up time and return pipe temperature of the refrigeration and freezing systems specifically involves: The system obtains the start-up time of the refrigeration system and the freezing system. If the absolute value of the difference between the start-up time of the refrigeration system and the freezing system is greater than the set system time difference threshold, the system that starts earlier is the priority start-up system. Otherwise, the system with the lower return pipe temperature is the priority start-up system.

[0032] Specifically, the system time difference threshold set in this embodiment is 10 seconds, that is: like The system that starts earlier will be given priority for startup; like The system with the lower return gas pipe temperature will be the first to start (because the lower the temperature, the higher the risk of condensation). in, This refers to the start-up time difference between the refrigeration and freezing systems.

[0033] It should be noted that the system startup time is defined as the moment when the solenoid valve opens and refrigerant flows to the corresponding evaporator; the control is determined by the solenoid valve status signal. Figure 1 Check if the solenoid valves in the entire structure are open; if so, check... Figure 1 If the outlet temperature of the refrigerated or frozen evaporator is greater than the set temperature threshold, then the system corresponding to the evaporator is in the start-up state.

[0034] This embodiment utilizes both start-up time difference and return pipe temperature as dual judgment criteria, prioritizing the start-up of systems with lower return pipe temperatures. This allows for more accurate identification of the system with the highest condensation risk under current operating conditions, thereby improving the targeting and effectiveness of anti-condensation control.

[0035] In this preferred embodiment, the triggering condition and the environmental condition are specifically as follows: If the temperature of the return pipe of a system is less than or equal to the set return pipe temperature threshold, or if the valve flow rate reaches the set flow rate ratio for a duration exceeding the set duration threshold, then the parameters of the corresponding system are considered to have met the trigger conditions. If the ambient humidity is greater than or equal to the set humidity threshold, then the environmental parameters meet the environmental conditions.

[0036] Specifically, in this embodiment, the temperature threshold for the return air pipe is set to 5.0℃; the duration threshold is set to 60s; and the humidity threshold is set to 75%RH.

[0037] When a corresponding bypass control valve of a system is opened at this time, the flow rate of the bypass control valve is controlled to reach the set flow rate ratio. In this embodiment, the set flow rate ratio is 80% (i.e., the valve opening is 80%).

[0038] At this time, the corresponding bypass control valve of the other system remains completely closed to avoid energy waste.

[0039] It should be noted that this embodiment uses a single-sided priority activation strategy, which is more energy-efficient than activating both sides simultaneously.

[0040] In this preferred embodiment, the pre-trained machine learning model predicts the condensation risk of the two systems at each time point within the first set period, specifically as follows: The machine learning model is a Long Short-Term Memory (LSTM) neural network; the training data source is the refrigerator operation data of the past 30 days (the refrigerator operation data includes ambient humidity, refrigeration return pipe temperature, freezer return pipe temperature, start-up time difference between the refrigeration system and the freezer system, and start-up duration of the refrigeration system and the freezer system); the label is the condensation probability at each moment, if condensation occurs, the condensation probability is 1, otherwise it is 0.

[0041] The ambient humidity, refrigeration return pipe temperature, refrigeration return pipe temperature, start-up time difference between the refrigeration system and the refrigeration system, and start-up duration of the refrigeration system and the refrigeration system within the set third cycle are all normalized and then input into the machine learning model to output the condensation risk of the two systems at each moment within the set first cycle. The condensation risk value is between 0 and 1.

[0042] The parameters of the Long Short-Term Memory network are updated once every set update cycle.

[0043] It should be noted that this embodiment uses multi-dimensional data input to a Long Short-Term Memory (LSTM) network to predict condensation risk, which can make full use of the correlation information on the time series, ensure the accuracy of condensation risk prediction, and provide a solid data foundation for subsequent coordinated control.

[0044] In this preferred embodiment, opening the bypass control valve of the bypass system before the triggering time specifically means: If the difference between the trigger time and the opening time of the bypass control valve of the first bypass system is greater than or equal to the set advance opening time, then the bypass control valve of the second bypass system will be opened at the trigger time minus the advance opening time. Otherwise, immediately open the bypass control valve of the downstream bypass system.

[0045] Specifically, in this embodiment, the control valve differential time threshold is set to 15s, and the early opening time is set to 10s (which can be set from 5 to 10s). If This requires opening the bypass control valve of the bypass system in advance, specifically after the current moment. The bypass control valve of the bypass system is opened at that time. It is the difference between the trigger time and the opening time of the bypass control valve of the bypass system.

[0046] It should be noted that in this embodiment, the time difference between the triggering time and the start time of the first bypass system is judged, and the start time is set in advance, so as to ensure that the subsequent bypass system has enough warm-up or preparation time.

[0047] In this preferred embodiment, for the system with all bypass control valves open, the opening degree of each bypass control valve is calculated based on the condensation risk, specifically as follows: For the bypass control valve of the bypass system, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the bypass system at the corresponding moment multiplied by the set control coefficient. Specifically, the control coefficient set in this embodiment is 0.8, that is:

[0048] in, The opening degree of the bypass control valve of the first bypass system at time t; The condensation risk of the bypass system at time t; For the bypass control valve of the downstream bypass system, if it is opened immediately, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient; if the bypass control valve of the downstream bypass system is opened at the moment of triggering minus the advance opening time, then from the moment the bypass control valve of the downstream bypass system is opened to the moment of triggering, the opening degree of the bypass control valve is always equal to the condensation risk of the downstream bypass system at the moment of triggering multiplied by the set control coefficient; the opening degree at each moment after the moment of triggering is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient, that is, for the bypass control valve of the downstream bypass system:

[0049] in, The current moment; For a moment t The opening degree of the bypass control valve of the rear bypass system; , They are time points t , Condensation risk in the back bypass system; The trigger time.

[0050] It should be noted that the opening control implemented in this embodiment enables the valve opening to closely follow the predicted changes in risk level.

[0051] In this preferred embodiment, the adjustment of the opening degree of the corresponding system based on the return gas pipe temperature of each system after each set second cycle is specifically as follows: For each system, after the set second cycle, the return gas pipe temperature of the corresponding system is read once. If the return gas pipe temperature of the corresponding system is greater than or equal to the set standard return gas pipe temperature, the current opening is maintained; otherwise, the opening of the corresponding bypass control valve is increased to the set first single-step opening. Specifically, in this embodiment, the standard return gas pipe temperature is set to 8.0°C, the second cycle is set to 5 seconds, and the first single-step opening is set to 5%.

[0052] It should be noted that after the dual system is running stably, this embodiment changes to periodic adjustment based on the return gas pipe temperature. When the temperature reaches the target, the opening is maintained; when it does not reach the target, it is gradually increased. This step-by-step adjustment strategy not only ensures the stability of temperature control but also simplifies the control algorithm, which is beneficial for engineering implementation.

[0053] In this preferred embodiment, if the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve is gradually closed, specifically: If the bypass control valve of the system has an opening duration greater than or equal to the set operating time threshold, and the return gas pipe temperature is greater than or equal to the set standard return gas pipe temperature, and the rate of change of the return gas pipe temperature is less than the set fluctuation threshold, then the opening degree of the corresponding bypass control valve is gradually reduced according to the set second single-step opening degree until the bypass control valve is closed.

[0054] Specifically, in this embodiment, the running time threshold is set to 120s; the fluctuation threshold is set to 0.5℃ / min. The second single-step opening degree is set to 10%, specifically, the opening degree is reduced by 10% every 10s until it reaches 0%.

[0055] It should be noted that this embodiment considers multiple characteristics such as duration, temperature, and fluctuations when making exit decisions, and uses a method of gradually reducing the valve opening to close the valve, thereby avoiding a sharp rebound in the temperature of the return gas pipe caused by rapid valve closure and ensuring a smooth and reliable system exit process.

[0056] In this preferred embodiment, if the compressor exhaust pipe temperature is greater than the set overheat threshold, or if any of the opened bypass control valves gives an abnormal feedback signal, or if any of the opened bypass control valves, after a set opening time threshold, results in the corresponding system return pipe temperature rise being less than the set temperature rise threshold, then all bypass control valves are closed.

[0057] Specifically, the set overheat threshold is 100℃; exceeding this value poses an overheating risk. An abnormal feedback signal from the bypass control valve indicates valve jamming. Abnormal feedback signals include, but are not limited to, failure to receive a control valve feedback signal, excessively long feedback signal delay, or other abnormalities. In this embodiment, the set opening time threshold is 10 seconds, and the set temperature rise threshold is 1.0℃. If the temperature rise of the system's return gas pipe is less than the set temperature rise threshold, it indicates a pipe blockage in the corresponding system. After closing all bypass control valves, an early warning is issued, indicated by a buzzer and the display showing "E07: Anti-condensation system abnormality".

[0058] It should be noted that this embodiment incorporates multiple safety redundancy mechanisms, including exhaust pipe overheat protection, valve feedback signal abnormality protection, and temperature rise effect evaluation protection. These mechanisms can immediately terminate the bypass operation when the system malfunctions or the anti-condensation effect is poor, thus comprehensively ensuring the operational safety and reliability of the refrigeration system.

[0059] Embodiment 2 of the present invention proposes a backflow prevention pipe condensation control system based on the method described in Embodiment 1 of the present invention, comprising: a priority start system identification module, a single system bypass module, a dual system collaborative control module, and an exit module, specifically: Priority Startup System Identification Module: Used to identify the priority startup system in the refrigeration and freezing systems based on the startup time and return pipe temperature of the refrigeration and freezing systems. Single system bypass module: If the return pipe temperature of only one system in the refrigeration system and the freezing system meets the set trigger condition, the bypass control valve of the corresponding system will be opened; if the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start system will be opened; the system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Dual-system collaborative control module: used to predict the condensation risk of the two systems at each moment within the first set period based on a pre-trained machine learning model; the moment when the condensation risk of the downstream bypass system is higher than the set condensation threshold is used as the trigger moment; if the difference between the trigger moment and the opening moment of the bypass control valve of the upstream bypass system is less than or equal to the set control valve difference time threshold, the downstream bypass control valve is opened before the trigger moment; otherwise, the downstream bypass control valve is not opened; for all systems with open bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk; if the opening duration of the bypass control valves of both the upstream and downstream bypass systems exceeds the set third time threshold, then every second set period, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system; Exit Module: If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, the corresponding bypass control valve will be gradually closed.

[0060] It should be noted that this embodiment achieves the anti-condensation system design through a modular approach. Each module has a clearly defined function, which can efficiently and orderly execute complex anti-condensation control strategies and is easy to integrate and deploy on existing refrigerator control platforms.

[0061] Embodiment 3 of the present invention proposes a dual-system air-cooled refrigerator that integrates the anti-backflow condensation control system described in Embodiment 2 of the present invention.

[0062] It should be noted that this embodiment integrates the anti-condensation control system into the dual-system air-cooled refrigerator, which can effectively solve the technical problem of easy condensation on the refrigerator's return pipe in high temperature and high humidity environments.

[0063] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0064] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0065] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0066] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method of controlling condensation in a backflow pipe, characterized by, include: Based on the start-up time and return pipe temperature of the refrigeration and freezing systems, the priority start-up system in the refrigeration and freezing systems is determined. If the return pipe temperature of only one system in the refrigeration and freezing systems meets the set trigger condition, the bypass control valve of the corresponding system is opened. If the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start-up system is opened. The system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Based on the pre-trained machine learning model, the condensation risk of the two systems at each moment within the first set period is predicted; the moment when the condensation risk of the subsequent bypass system is higher than the set condensation threshold is taken as the trigger moment; if the difference between the trigger moment and the opening moment of the bypass control valve of the first bypass system is less than or equal to the set control valve difference time threshold, then the bypass control valve of the subsequent bypass system is opened before the trigger moment; for all systems with open bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk; if the opening duration of the bypass control valves of both the first and subsequent bypass systems exceeds the set third time threshold, then every second set period, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system; If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve will be gradually closed.

2. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: The method of determining the priority start-up system among the refrigeration and freezing systems based on the start-up time and return pipe temperature of the refrigeration and freezing systems is as follows: The system obtains the start-up time of the refrigeration system and the freezing system. If the absolute value of the difference between the start-up time of the refrigeration system and the freezing system is greater than the set system time difference threshold, the system that starts earlier is the priority start-up system. Otherwise, the system with the lower return pipe temperature is the priority start-up system.

3. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: The triggering conditions and the environmental conditions are specifically as follows: If the temperature of the return pipe of a system is less than or equal to the set return pipe temperature threshold, or if the valve flow rate reaches the set flow rate ratio for a duration exceeding the set duration threshold, then the parameters of the corresponding system are considered to have met the trigger conditions. If the ambient humidity is greater than or equal to the set humidity threshold, then the environmental parameters meet the environmental conditions.

4. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: The pre-trained machine learning model predicts the condensation risk of the two systems at each time point within the first set period, specifically as follows: The machine learning model is a long short-term memory network; The ambient humidity, refrigeration return pipe temperature, refrigeration return pipe temperature, start-up time difference between the refrigeration and refrigeration systems, and start-up duration of the refrigeration and refrigeration systems within the set third cycle are all normalized and then input into the machine learning model to output the condensation risk of the two systems at each moment within the set first cycle.

5. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: The bypass control valve of the bypass system that is opened before the triggering time is specifically as follows: If the difference between the trigger time and the opening time of the bypass control valve of the first bypass system is greater than or equal to the set advance opening time, then the bypass control valve of the second bypass system will be opened at the trigger time minus the advance opening time. Otherwise, immediately open the bypass control valve of the downstream bypass system.

6. The method for controlling condensation in a backflow prevention pipe according to claim 5, characterized in that: For the system with all bypass control valves open, the opening degree of each bypass control valve is calculated based on the condensation risk, specifically as follows: For the bypass control valve of the bypass system, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the bypass system at the corresponding moment multiplied by the set control coefficient. For the bypass control valve of the downstream bypass system, if it is opened immediately, the opening degree of the bypass control valve at each moment is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient; if the bypass control valve of the downstream bypass system is opened at the moment of triggering minus the advance opening time, the opening degree of the bypass control valve from the moment the downstream bypass control valve is opened to the moment of triggering will always be equal to the condensation risk of the downstream bypass system at the moment of triggering multiplied by the set control coefficient; the opening degree at each moment after the moment of triggering is equal to the condensation risk of the downstream bypass system at the corresponding moment multiplied by the set control coefficient.

7. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: The opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system after each set second cycle, specifically as follows: For each system, after the set second cycle, the return gas pipe temperature of the corresponding system is read once. If the return gas pipe temperature of the corresponding system is greater than or equal to the set standard return gas pipe temperature, the current opening is maintained; otherwise, the opening of the corresponding bypass control valve is increased to the set first single-step opening.

8. The method for controlling condensation in a backflow prevention pipe according to claim 7, characterized in that: If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, then the corresponding bypass control valve will be gradually closed, specifically: If the bypass control valve of the system has an opening duration greater than or equal to the set operating time threshold, and the return gas pipe temperature is greater than or equal to the set standard return gas pipe temperature, and the rate of change of the return gas pipe temperature is less than the set fluctuation threshold, then the opening degree of the corresponding bypass control valve is gradually reduced according to the set second single-step opening degree until the bypass control valve is closed.

9. The method for controlling condensation in a backflow prevention pipe according to claim 1, characterized in that: If the compressor discharge pipe temperature exceeds the set overheat threshold, or if any open bypass control valve provides an abnormal feedback signal, or if any open bypass control valve, after a set opening time threshold has elapsed since opening, results in a temperature rise in the corresponding system's return pipe that is less than the set temperature rise threshold, then all bypass control valves will be closed.

10. A backflow prevention condensation control system based on the method of any one of claims 1-9, comprising: The system prioritizes the activation of the system identification module, single-system bypass module, dual-system collaborative control module, and exit module, characterized by: Priority Startup System Identification Module: Used to identify the priority startup system in the refrigeration and freezing systems based on the startup time and return pipe temperature of the refrigeration and freezing systems. Single system bypass module: If the return pipe temperature of only one system in the refrigeration system and the freezing system meets the set trigger condition, the bypass control valve of the corresponding system will be opened; if the return pipe temperature of both systems meets the set trigger condition and / or the ambient humidity meets the set environmental condition, the bypass control valve of the priority start system will be opened; the system whose bypass control valve is currently opened is the first bypass system, and the system whose bypass control valve is not opened is the second bypass system. Dual-system collaborative control module: used to predict the condensation risk of the two systems at each moment within the first set period based on a pre-trained machine learning model; the moment when the condensation risk of the downstream bypass system is higher than the set condensation threshold is used as the trigger moment; if the difference between the trigger moment and the opening moment of the bypass control valve of the upstream bypass system is less than or equal to the set control valve difference time threshold, the bypass control valve of the downstream bypass system is opened before the trigger moment; for all systems with opened bypass control valves, the opening degree of each bypass control valve is calculated based on the condensation risk; if the opening duration of the bypass control valves of both the upstream and downstream bypass systems exceeds the set third time threshold, then every second set period, the opening degree of the corresponding system is adjusted based on the return gas pipe temperature of each system; Exit Module: If the system's bypass control valve opening duration, return gas pipe temperature, and return gas pipe temperature change rate meet the set exit conditions, the corresponding bypass control valve will be gradually closed.

11. A dual-system air-cooled refrigerator, characterized in that, The anti-return air pipe condensation control system described in claim 10 is integrated.

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