Control method of grain storage refrigeration equipment and grain storage refrigeration equipment

Abstract

The application discloses a control method of a grain bin refrigeration device and the grain bin refrigeration device. The control method comprises the following steps: acquiring the evaporator wall temperature and the air supply temperature; if the evaporator wall temperature and / or the air supply temperature are abnormal, adjusting the hot air flow and the compressor operation frequency according to the abnormal condition until the evaporator wall temperature and the air supply temperature are normal. The technical scheme guarantees the stable low-temperature environment of the grain bin.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, specifically relating to control methods for grain silo refrigeration equipment and the grain silo refrigeration equipment itself. Background Technology

[0002] With the rapid development of the grain storage industry and the continuous improvement of grain quality control requirements, low-temperature grain storage has become a core technological approach to delay grain quality deterioration, inhibit mold and pests, and extend storage periods. As the core equipment for regulating the grain storage environment, grain refrigeration equipment is seeing its application scale continuously expand in various types of grain warehouses. A stable and sustained low-temperature environment is a core prerequisite for ensuring grain quality. Grain refrigeration equipment needs to operate continuously for extended periods, continuously outputting a uniformly temperatured low-temperature airflow to maintain a constant temperature in the grain pile and ensure a stable low-temperature environment for grain storage. During long-term low-temperature operation, the continuous influence of high-humidity air inside the grain warehouse can easily cause frost to form at the evaporator heat exchange section (heat exchange chamber). This frost significantly reduces the heat exchange efficiency of the evaporator, leading to a decrease in the cooling capacity of the refrigeration equipment and a reduction in airflow, which in turn causes temperature fluctuations inside the warehouse and disrupts the stability of the low-temperature environment.

[0003] Currently, the industry mainly uses traditional passive defrosting solutions such as electric heating defrosting and four-way valve reversing defrosting. Both require waiting for the frost layer to accumulate to a certain thickness before centralized defrosting. Electric heating defrosting causes the supply air temperature of the refrigeration equipment to rise rapidly in a short period of time, while four-way valve reversing defrosting pauses the refrigeration output during the defrosting stage. Both cause drastic fluctuations in supply air temperature, directly disrupting the stable low-temperature environment of the grain silo. This easily leads to problems such as condensation on the grain surface and silo walls, and microbial growth, seriously affecting grain storage safety. In other words, conventional defrosting solutions from traditional civilian or industrial refrigeration equipment have significant adaptability defects when directly applied to grain storage scenarios, and cannot meet the stringent temperature stability requirements of grain storage environments. Therefore, specialized anti-frost control technology adapted to grain silo conditions is gradually becoming a core research direction in the industry.

[0004] Therefore, ensuring a stable low-temperature environment in grain warehouses is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to ensure a stable low-temperature environment in the grain warehouse.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to one aspect of the embodiments of this application, a control method for a grain silo refrigeration device is provided, the refrigeration device comprising:

[0008] A compressor is used to compress and heat gaseous refrigerant. A condenser, which is connected to the compressor via a refrigerant pipeline, is used to cool and liquefy the gaseous refrigerant output by the compressor; An evaporator is connected to the condenser and the compressor via refrigerant pipes. It is used to absorb heat from the gas in the heat exchange chamber outside the refrigerant pipes and evaporate the liquid refrigerant output from the condenser to the evaporator into gaseous refrigerant. The gaseous refrigerant is then drawn to the compressor through the refrigerant pipes. A defroster is used to collect hot air and deliver it to the heat exchange chamber of the evaporator through a hot air delivery duct. The heat exchange chamber is connected to the grain silo via air supply pipes and return air pipes. The air supply pipes transport the gas in the heat exchange chamber to the grain silo, and the gas in the grain silo is transported to the heat exchange chamber via the return air pipes for heat exchange. Sensor array used to acquire evaporator wall temperature and supply air temperature in air duct; The control method includes: Obtain the evaporator wall temperature and the supply air temperature; If the evaporator wall temperature and / or supply air temperature are abnormal, adjust the hot air flow rate and compressor operating frequency accordingly until the evaporator wall temperature and supply air temperature are normal.

[0009] According to one aspect of the embodiments of this application, the defroster collects hot air from the space where at least one of the compressor and condenser is located.

[0010] According to one aspect of the embodiments of this application, the defroster includes a flow regulating valve for adjusting the hot air flow rate; If the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency shall be adjusted accordingly, including: If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is within the set temperature range, the opening of the flow regulating valve is increased to increase the hot air flow.

[0011] According to one aspect of the embodiments of this application, the defroster includes a flow regulating valve for adjusting the hot air flow rate; If the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormality. This also includes: If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is lower than the minimum value of the set temperature range, then the opening of the flow regulating valve is increased and the operating frequency of the compressor is reduced. If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is higher than the maximum value of the set temperature range, then the opening of the flow regulating valve is increased, and the operating frequency of the compressor is increased.

[0012] According to one aspect of the embodiments of this application, if the evaporator wall temperature and / or the supply air temperature are abnormal, the hot air flow rate and the compressor operating frequency are adjusted accordingly based on the abnormality, further comprising: If the evaporator wall temperature is greater than or equal to the frosting temperature threshold and the air supply temperature is less than the minimum value of the set temperature range, then the compressor operating frequency is reduced. If the evaporator wall temperature is greater than or equal to the frosting temperature threshold, and the air supply temperature is greater than the maximum value of the set temperature range, then the compressor operating frequency is increased.

[0013] According to one aspect of the embodiments of this application, the method further includes: Based on the compressor's frequency conversion plan, determine the frequency conversion timing and frequency conversion amount; Based on the frequency conversion time, the adjustment time of the hot air flow rate is determined, so as to adjust the hot air flow rate according to the frequency conversion amount at the adjustment time, wherein the adjustment time is earlier than or equal to the frequency conversion time.

[0014] According to one aspect of the embodiments of this application, the method further includes: The grain warehouse temperature, grain warehouse humidity, and refrigeration equipment operating time are input into a pre-trained anomaly prediction model, which is used to predict the occurrence of anomalies in the first time period. If the prediction results show an anomaly, the adjustment time is determined based on the time when the anomaly occurs. The prediction results include the time when the anomaly occurs and the type of anomaly. Depending on the type of anomaly, the hot air flow rate and / or compressor operating frequency are adjusted at the adjustment time. Two hours after the adjustment time, cancel the adjustment of hot air flow and / or compressor operating frequency.

[0015] According to one aspect of the embodiments of this application, the defroster includes a flow regulating valve for adjusting the hot air flow rate, and the method further includes: If the evaporator wall temperature is less than the third time threshold for frosting, then restart the flow regulating valve or the refrigeration equipment. According to at least one flow adjustment command of the flow regulating valve, the opening degree of the flow regulating valve is controlled sequentially; if the actual hot air flow is the same as the adjusted hot air flow corresponding to the flow adjustment command, the flow regulating valve is adjusted according to the evaporator wall temperature to adjust the hot air flow; if the actual hot air flow is different from the adjusted hot air flow corresponding to the flow adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

[0016] According to one aspect of the embodiments of this application, the method further includes: If the air supply temperature is not within the fourth time interval of the set temperature range, then restart the compressor or refrigeration equipment; According to at least one frequency adjustment command of the compressor, the operating frequency of the compressor is controlled sequentially; if the actual air supply temperature is the same as the adjusted air supply temperature corresponding to the frequency adjustment command, the operating frequency of the compressor is adjusted according to the relationship between the actual air supply temperature and the set temperature range; if the actual air supply temperature is different from the adjusted air supply temperature corresponding to the frequency adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

[0017] According to one aspect of the embodiments of this application, a grain storage refrigeration device is provided, the refrigeration device comprising: A compressor is used to compress and heat gaseous refrigerant. A condenser, which is connected to the compressor via a refrigerant pipeline, is used to cool and liquefy the gaseous refrigerant output by the compressor; An evaporator is connected to the condenser and the compressor via refrigerant pipes. It is used to absorb heat from the gas in the heat exchange chamber outside the refrigerant pipes and evaporate the liquid refrigerant output from the condenser to the evaporator into gaseous refrigerant. The gaseous refrigerant is then drawn to the compressor through the refrigerant pipes. A defroster is used to collect hot air and deliver it to the heat exchange chamber of the evaporator through a hot air delivery duct. The heat exchange chamber is connected to the grain silo via air supply pipes and return air pipes. The air supply pipes transport the gas in the heat exchange chamber to the grain silo, and the gas in the grain silo is transported to the heat exchange chamber via the return air pipes for heat exchange. Sensor array used to acquire evaporator wall temperature and supply air temperature in air duct; A control unit configured to execute the control method described in any one of the above descriptions.

[0018] The control method for grain silo refrigeration equipment described in this application embodiment includes the following refrigeration equipment: a compressor for compressing and heating gaseous refrigerant; a condenser connected to the compressor via a refrigerant pipeline for cooling and liquefying the gaseous refrigerant output from the compressor; an evaporator connected to both the condenser and the compressor via refrigerant pipelines for absorbing heat from the gas in the heat exchange chamber outside the refrigerant pipeline, evaporating the liquid refrigerant output from the condenser to the evaporator into gaseous refrigerant, which is then drawn to the compressor via the refrigerant pipeline; a defroster for collecting hot air and delivering it to the heat exchange chamber of the evaporator via a hot air delivery pipeline; wherein the heat exchange chamber is connected to the grain silo via both a supply air pipeline and a return air pipeline, the supply air pipeline delivers gas from the heat exchange chamber to the grain silo, and the return air pipeline delivers gas from the grain silo to the heat exchange chamber for heat exchange; and a sensor group for acquiring the evaporator wall temperature and the supply air temperature of the supply air pipeline. The control method includes: Obtain the evaporator wall temperature and supply air temperature; if the evaporator wall temperature and / or supply air temperature are abnormal, adjust the hot air flow rate and compressor operating frequency according to the abnormality until the evaporator wall temperature and supply air temperature are normal.

[0019] This technical solution obtains the evaporator wall temperature and supply air temperature, and adjusts the hot air flow rate and compressor operating frequency accordingly when the evaporator wall temperature and / or supply air temperature are abnormal, until the evaporator wall temperature and supply air temperature return to normal, effectively ensuring a stable low-temperature environment in the grain silo. On the one hand, by adjusting the hot air flow rate to deliver hot air to the evaporator heat exchange section (heat exchange chamber), the evaporator wall temperature can be increased, inhibiting frost formation at the source and preventing frost accumulation from reducing evaporator heat exchange efficiency and cooling capacity, thus ensuring a continuous and stable output of cooling capacity from the refrigeration equipment. On the other hand, synchronously adjusting the compressor operating frequency can offset the impact of hot air intervention on the supply air temperature, avoiding large fluctuations in the supply air temperature. The synergistic effect of hot air regulation and compressor frequency adjustment maintains a stable supply air temperature while suppressing evaporator frost formation (frost formation at the evaporator heat exchange section (heat exchange chamber)), continuously ensuring a constant low-temperature environment in the grain silo and avoiding the risks to grain quality caused by sudden temperature changes in traditional post-defrosting methods. In other words, the technical solution described in this application ensures a stable low-temperature environment for grain storage and avoids temperature fluctuations in grain storage caused by frost formation and defrosting at the heat exchanger (heat exchange chamber) of the evaporator.

[0020] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] Figure 1 A schematic diagram of a refrigeration device according to an embodiment of this application is shown.

[0024] Figure 2 A flowchart is shown for a control method of a grain silo refrigeration device according to an embodiment of this application.

[0025] Figure 3 A flowchart is shown showing how, according to one embodiment of this application, if the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormal situation.

[0026] Figure 4 A flowchart is shown showing how, according to another embodiment of this application, if the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormal situation.

[0027] Figure 5 A flowchart illustrating pre-adjustment of abnormal conditions based on compressor operating conditions is shown according to an embodiment of this application.

[0028] Figure 6 A flowchart illustrating pre-adjustment of abnormal conditions based on compressor operating conditions is shown according to another embodiment of this application.

[0029] Figure 7 A flowchart of fault adjustment according to one embodiment of this application is shown.

[0030] Figure 8 A flowchart of fault regulation according to another embodiment of this application is shown.

[0031] Figure 9 A block diagram of a computer device structure for implementing a control method for a grain silo refrigeration device according to an embodiment of this application is shown. Detailed Implementation

[0032] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0033] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0034] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0035] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0036] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware (such as processing circuitry or memory), or a combination thereof. Similarly, a processor (or multiple processors or memory) can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0037] First, please refer to Figure 1 , Figure 1 A schematic diagram of a refrigeration device according to an embodiment of this application is shown. The refrigeration device described in this application (i.e., a grain silo refrigeration device) includes a compressor, a condenser, an evaporator, a defroster, a control unit (not shown), and a sensor group. The different components in the above-described refrigeration device form three working systems.

[0038] First, there is the refrigerant refrigeration cycle system, which achieves refrigeration through the physical changes of the refrigerant. It consists of a compressor, condenser, evaporator and refrigerant pipes connected in series to form a closed loop.

[0039] The compressor's inlet is connected to the evaporator's refrigerant outlet via a refrigerant pipe, receiving the gaseous refrigerant after evaporation. The compressor's outlet is connected to the condenser's refrigerant inlet via a refrigerant pipe, delivering the compressed, high-temperature, high-pressure refrigerant to the condenser. The compressor's signal terminal is electrically connected to the control unit and is controlled by it. The compressor provides power for the entire refrigerant cycle, compressing the low-temperature, low-pressure gaseous refrigerant flowing in from the evaporator into a high-temperature, high-pressure gaseous refrigerant.

[0040] The condenser cools the high-temperature, high-pressure gaseous refrigerant delivered by the compressor, causing it to cool down and liquefy into liquid refrigerant, while simultaneously dissipating the heat carried by the refrigerant into the outside air. The refrigerant inlet of the condenser is connected to the discharge end of the compressor via a refrigerant pipe; the refrigerant outlet of the condenser is connected to the refrigerant inlet of the evaporator via a refrigerant pipe, so that the liquefied refrigerant can be delivered to the evaporator.

[0041] The evaporator evaporates the incoming liquid refrigerant into gaseous refrigerant. During the evaporation process, it absorbs a large amount of heat from the surrounding air, thus cooling the air and making it the core component that directly produces cool air. The refrigerant inlet of the evaporator is connected to the refrigerant outlet of the condenser via a refrigerant pipe to receive the liquid refrigerant; the refrigerant outlet of the evaporator is connected to the air inlet of the compressor via a refrigerant pipe to send the evaporated gaseous refrigerant back to the compressor, completing the refrigerant closed-loop cycle.

[0042] In some embodiments, the evaporator is provided with a heat exchange chamber for heat exchange between the refrigerant and the gas outside the refrigerant pipe within the evaporator.

[0043] That is, the compressor runs continuously, compressing the gaseous refrigerant into a high-temperature and high-pressure state and then sending it into the condenser; the condenser dissipates heat to the outside, causing the refrigerant to liquefy into a liquid state; the liquid refrigerant flows into the evaporator and evaporates rapidly, absorbing heat and carrying away the heat of the gas in the heat exchange chamber of the evaporator; the evaporated gaseous refrigerant flows back to the compressor, and the cycle repeats, continuously generating cooling capacity in the heat exchange chamber of the evaporator.

[0044] Secondly, the grain silo air circulation system. This system enables the exchange of cold air with the air in the grain silo, and is composed of the heat exchange chamber in the evaporator, the supply air duct, the return air duct, and the internal space of the grain silo to form a closed-loop air circulation path.

[0045] The heat exchange chamber, formed inside the evaporator, provides a space for heat exchange between the external gas and the refrigerant in the evaporator. The return air from the grain silo is cooled by the evaporator here, resulting in cold air. The air outlet of the heat exchange chamber connects to the supply air duct, and the return air outlet connects to the return air duct; it is the core heat exchange node in the air circulation system.

[0046] The air supply duct delivers the cooled airflow from the heat exchange chamber to the grain silo, providing cooling for the grain pile and maintaining a low-temperature environment. The air supply duct inlet is connected to the air outlet of the heat exchange chamber, and the air supply duct outlet extends into the grain storage area inside the silo.

[0047] The return air duct transports the warmer air from the grain silo back to the heat exchange chamber for cooling, thus replenishing the cooling capacity. The inlet of the return air duct is connected to the inside of the grain silo, and the outlet of the return air duct is connected to the inlet of the heat exchange chamber.

[0048] In other words, warm air inside the grain silo flows into the heat exchange chamber through the return air duct. As it passes through the evaporator, it absorbs heat and cools down into cold air. This cold air is then transported to the inside of the grain silo through the supply air duct, further cooling the space. The warmer air inside the grain silo then flows back into the heat exchange chamber through the return air duct, forming a closed-loop air circulation that continuously maintains the low-temperature environment of the grain silo. It is important to note that the temperature of the warmer air inside the grain silo is higher than the temperature of the air inside the supply air duct.

[0049] Finally, the hot-flash defrosting system includes a defroster and an evaporator. In some embodiments, the defroster includes a hot air acquisition module, a hot air delivery duct, and a flow regulating valve. This system is used to suppress frost formation on the evaporator (evaporator frost refers to frost formation at the heat exchange section (heat exchange chamber) of the evaporator), and its core function is to prevent frost formation. It should be noted that in some embodiments, the sensor group consists of a detection unit composed of multiple temperature sensors, respectively arranged at the evaporator heat exchange section or on the inner wall of the heat exchange chamber, or inside the air duct, to collect temperature data at the corresponding locations in real time and transmit the data to the control unit of the refrigeration equipment. It should be clarified that the defroster is used to prevent frost formation at the evaporator heat exchange section. In some embodiments, the defroster is used to prevent frost formation on the inner wall of the heat exchange chamber.

[0050] The hot air acquisition module can collect waste heat generated by the equipment itself (such as heat emitted from the compressor casing or hot air discharged from the condenser) or external hot air (as long as its temperature is higher than the temperature inside the heat exchange chamber), without the need for additional heating elements, providing a heat source for preventing frost formation. In some embodiments, the hot air acquisition module is an air pump, and its outlet is connected to the air inlet of the hot air delivery pipe.

[0051] In some embodiments, the hot air acquisition module is arranged in the space where the compressor and / or condenser are located, and collects the hot air generated by the compressor and / or condenser and sends it to the air inlet of the hot air delivery duct. In some embodiments, the hot air acquisition module includes a heat collection hood or an air guide hood, which is disposed on the outside of the compressor housing or at the condenser exhaust port.

[0052] The hot air delivery duct guides the collected hot air to the evaporator heat exchange area (heat exchange chamber) to supplement the heat of the evaporator heat exchange area (heat exchange chamber). The air inlet of the hot air delivery duct is connected to the air outlet of the hot air collection module, and the air outlet extends to the evaporator heat exchange area (heat exchange chamber), with the air outlet facing the frosting area of ​​the evaporator heat exchange area (heat exchange chamber). In some embodiments, the air outlet of the hot air delivery duct is provided with a guide port, which is arranged facing the air inlet of the evaporator or the frosting area of ​​the evaporator heat exchange area (heat exchange chamber), so that the hot air can be evenly introduced into the low-temperature airflow of the evaporator heat exchange area (heat exchange chamber).

[0053] The flow regulating valve precisely controls the flow rate of hot air delivery by adjusting its opening, achieving dynamic adjustment of the heat supply. The larger the opening of the flow regulating valve, the greater the hot air flow. The flow regulating valve is installed in series on the hot air delivery pipeline. The signal terminal of the flow regulating valve is electrically connected to the control unit, reporting the current opening to the control unit and receiving control from the control unit to adjust the opening.

[0054] In other words, the temperature sensor array continuously (at set intervals, such as 3 minutes) collects the evaporator wall temperature and supply air temperature, transmitting the data to the control unit in real time. The control unit compares the collected data with preset thresholds (frost temperature threshold, set temperature range) to determine if the current situation is abnormal. If the situation is normal, the current hot air flow and compressor operating frequency remain unchanged; if an abnormality occurs, the adjustment strategy is matched according to the type of abnormality: if there is only a risk of frosting (evaporator wall temperature is lower than the frosting temperature threshold), the hot air flow is increased to supplement heat and prevent frost; if there is a risk of frosting and the supply air temperature is low (supply air temperature is lower than the minimum value of the set temperature range), the hot air flow is increased and the compressor frequency is reduced; if there is a risk of frosting and the supply air temperature is high (supply air temperature is higher than the maximum value of the set temperature range), the hot air flow is increased and the compressor frequency is increased; if only the supply air temperature is abnormal, the compressor frequency is adjusted separately. During the adjustment process, temperature data is continuously collected until both the evaporator wall temperature and the supply air temperature return to the normal range, then the adjustment stops and the current operating parameters are maintained, with closed-loop control throughout the process.

[0055] In some embodiments, the sensor array includes an evaporator wall temperature sensor, which may be disposed at the evaporator heat exchange area or on the inner surface of the heat exchange chamber, for acquiring the evaporator wall temperature. The sensor array also includes a supply air temperature sensor, for acquiring the supply air temperature after heat exchange in the evaporator heat exchange chamber, which may be disposed at the air outlet of the heat exchange chamber.

[0056] In some embodiments, the control unit receives sensor data, determines the equipment's operating status, and outputs control commands to adjust the hot air flow and compressor operating frequency, thereby achieving fully automatic anti-frost and constant temperature control. The control unit's signal input terminal is electrically connected to the temperature sensor group to receive detection data; its signal output terminal is electrically connected to the compressor and flow regulating valve, respectively, to issue control commands for frequency adjustment and flow regulating valve opening adjustment.

[0057] Please see Figure 2 , Figure 2 A flowchart illustrating a control method for a grain silo refrigeration device according to an embodiment of this application is shown. This application embodiment provides the execution steps of a control method for a grain silo refrigeration device, including: Step S110: Obtain the evaporator wall temperature and the supply air temperature; Step S120: If the evaporator wall temperature and / or supply air temperature are abnormal, adjust the hot air flow rate and compressor operating frequency according to the abnormality until the evaporator wall temperature and supply air temperature are normal.

[0058] The two steps described above are described in detail below.

[0059] In step S110, the evaporator wall temperature refers to the actual temperature of the evaporator heat exchange section (heat exchange chamber), which is the core parameter for determining whether there is a risk of frost formation on the evaporator. When the evaporator wall temperature is lower than the dew point temperature of the surrounding air (frost temperature threshold), water vapor in the air will condense on the surface of the evaporator heat exchange section (heat exchange chamber) to form a frost layer, thereby increasing the heat exchange resistance and reducing the refrigeration efficiency. The supply air temperature refers to the temperature of the cold air delivered to the grain silo in the supply air duct, which is a core indicator that directly reflects whether the cooling output of the refrigeration equipment meets the low-temperature requirements for grain storage.

[0060] It is important to clarify that dew point temperature is the temperature at which air reaches saturation when cooled under constant water vapor content and air pressure. It can also be understood as the temperature at which water vapor in the air begins to condense into water droplets. In some embodiments, the dew point temperature is calculated by detecting environmental parameters (such as water vapor content and air pressure) in the environment where the heat exchange section (heat exchange chamber) is located in the evaporator or in the return air duct.

[0061] During equipment operation, the sensor group continuously (or at set intervals, such as 3 minutes) monitors the evaporator wall temperature (temperature at the evaporator heat exchange point (heat exchange chamber)) and the supply air temperature in the air duct, and transmits the real-time temperature data to the control unit to monitor the frost risk status of the evaporator heat exchange point (heat exchange chamber) and the cooling output effect of the return air duct.

[0062] In step S120, the hot air flow rate refers to the volumetric flow rate of hot air delivered by the defroster to the evaporator heat exchange section (heat exchange chamber) per unit time through the hot air delivery pipe. The magnitude of the hot air flow rate determines the intensity of heat replenishment to the evaporator heat exchange section (heat exchange chamber). In some embodiments, this can be adjusted by setting the valve opening on the hot air delivery pipe. The compressor operating frequency refers to the operating frequency of the compressor. The operating frequency directly determines the refrigerant circulation speed and the system cooling capacity; the higher the operating frequency, the faster the refrigerant circulation and the greater the cooling capacity (lower supply air temperature); the lower the operating frequency, the smaller the cooling capacity (higher supply air temperature).

[0063] The collected evaporator wall temperature and supply air temperature are compared with the preset frosting temperature threshold and the set temperature range, respectively. When abnormalities are detected in the evaporator wall temperature (temperature of the evaporator heat exchange section (heat exchange chamber)), the supply air temperature, or both, the hot air flow rate and the compressor operating frequency are adjusted according to the specific type of abnormality.

[0064] It is important to clarify that for different abnormal combinations, the adjustment direction of the hot air flow and the compressor frequency should be matched accordingly to achieve a dynamic match between the heat compensation and the cooling capacity, rather than a single fixed adjustment method. For example, if only the evaporator wall temperature is abnormal (below the frosting temperature threshold), the corresponding adjustment is made by changing the heat compensation intensity to the evaporator, thus mitigating the frosting risk caused by the low evaporator wall temperature (temperature at the evaporator heat exchange point (heat exchange chamber)). If only the supply air temperature is abnormal (greater than the maximum value of the set temperature range, or less than the minimum value of the set temperature range), the overall cooling capacity is changed by adjusting the compressor operating frequency to offset the influence of the external environment on the supply air temperature and ensure its stability. If both evaporator wall temperature and supply air temperature abnormalities occur simultaneously, both the hot air flow and the compressor operating frequency should be adjusted concurrently.

[0065] After completing one adjustment, continue to acquire the evaporator wall temperature (temperature of the evaporator heat exchange section (heat exchange chamber)) and supply air temperature. If the evaporator wall temperature and / or supply air temperature are abnormal, continue to adjust the hot air flow rate and / or compressor operating frequency accordingly based on the evaporator wall temperature and supply air temperature. In this way, the adjustment process is carried out successively and continuously verified until the evaporator wall temperature and supply air temperature both return to the normal range, and then the current parameters are maintained for stable operation.

[0066] This application embodiment effectively ensures a stable low-temperature environment in the grain silo by collecting two parameters: evaporator wall temperature and supply air temperature, and adjusting the hot air flow and compressor operating frequency in response to abnormal operating conditions. On one hand, based on the evaporator wall temperature (which is below the frosting temperature threshold), the risk of frosting is identified. By adjusting the hot air flow to deliver hot air to the evaporator heat exchange area (heat exchange chamber), the wall temperature is raised, suppressing frost formation at its source. This avoids problems such as increased heat exchange resistance, decreased heat exchange efficiency, and reduced cooling capacity caused by thickened frost. Unlike traditional defrosting methods, there is no need to stop the machine for defrosting, fundamentally avoiding the drastic fluctuations in supply air temperature caused by the defrosting process, and reducing the impact of temperature fluctuations in the grain silo on the quality of stored grain. On the other hand, the compressor operating frequency is synchronously adjusted based on the real-time status of the supply air temperature, preventing interference from the reheating process or external factors, maintaining the supply air temperature continuously and stably within the set range, and ensuring the uniformity and stability of the low-temperature environment in the grain silo. The embodiments of this application do not require the addition of a high-power heating device. While achieving the dual goals of preventing frost formation and stabilizing the output temperature, they effectively control the energy consumption of the equipment and are suitable for the long-term continuous cooling needs of grain silos.

[0067] In some embodiments, the defroster includes a hot air collection module, which can collect waste heat generated by the device itself (such as heat emitted from the compressor housing or hot air discharged from the condenser) or external hot air (as long as its temperature is higher than the temperature at the evaporator heat exchange point (heat exchange chamber)). This provides a heat source for preventing frost formation without the need for additional heating elements, and then delivers the hot air to the evaporator heat exchange point (heat exchange chamber) through a hot air delivery duct. In some embodiments, the hot air collection module is an air pump, whose outlet is connected to the air inlet of the hot air delivery duct.

[0068] In some embodiments, the hot air acquisition module collects high-temperature air from a specific space to obtain the required hot air, which is a preliminary step for the defroster to replenish heat and prevent frost formation at the evaporator heat exchange section (heat exchange chamber). In some embodiments, the specific space refers to the space where the compressor is located and / or the space where the condenser is located. The space where the compressor is located refers to the local space surrounding the compressor's installation location; when the compressor is running, it continuously releases heat by compressing the gaseous refrigerant, raising the temperature of the surrounding air and forming a stable natural waste heat source. The space where the condenser is located refers to the local space surrounding the condenser's installation location; when the condenser cools and liquefies the high-temperature, high-pressure gaseous refrigerant, it continuously releases condensation heat, and the surrounding air temperature is relatively high, which is also a good waste heat source.

[0069] In other words, when the defrost unit (hot air collection module) needs to collect hot air, it directly draws high-temperature air from the surrounding space of at least one of the compressor and condenser. Both the compressor and condenser are heat-exhausting components in the refrigeration cycle, continuously radiating heat to the surrounding environment during operation. The air temperature in their respective spaces is significantly higher than the temperature at the evaporator heat exchange section (heat exchange chamber), providing a stable and suitable source of supplementary heat. After the defrost unit draws this high-temperature air, it delivers it to the space where the evaporator heat exchange section (heat exchange chamber) is located through a hot air delivery pipe, thus supplementing the evaporator with heat to suppress frost formation. No additional active heating devices such as electric heating are required throughout the process.

[0070] This embodiment of the application collects hot air from the space occupied by at least one of the compressor and condenser by defining a defrost unit (hot air collection module). It can directly recover the waste heat generated by the operation of the refrigeration system itself as a heat source, eliminating the need for an additional independent heating device. While meeting the heat replenishment requirements for evaporator anti-frost, it effectively reduces the operating energy consumption and manufacturing cost of the equipment. Both the compressor and condenser are stable heat-releasing components in the refrigeration cycle. The hot air collected from their space has a suitable temperature and a stable air source, which can continuously provide a reliable heat source for the heat exchange section (heat exchange chamber) of the evaporator, ensuring the effect of preventing frost. At the same time, it recovers and reuses the waste heat that would otherwise be directly lost to the environment, avoiding energy waste. Compared with the heat replenishment method of additional electric heating, it can significantly reduce energy consumption, which meets the energy-saving and consumption-reducing requirements of low-temperature grain storage. Furthermore, this data collection method does not require modification to the core refrigerant circulation structure of the refrigeration equipment. It only requires the placement of hot air collection components in the surrounding space of the corresponding heat-generating components. The equipment structure is simpler and easier to adapt to existing grain silo refrigeration equipment. At the same time, the selectability of two collection points also improves the adaptability of the solution to different equipment internal layouts. Collection points can be flexibly selected according to the actual installation space, ensuring the stability and ease of implementation of hot air collection.

[0071] In some embodiments, the defroster includes a flow regulating valve for adjusting the flow rate of hot air in the hot air delivery duct. A larger opening of the flow regulating valve results in a larger hot air flow and a stronger anti-frost effect on the evaporator heat exchange section (heat exchange chamber). The frosting temperature threshold refers to a pre-set critical temperature judgment value. When the evaporator wall temperature (temperature of the evaporator heat exchange section (heat exchange chamber)) is lower than this value, it is determined that there is a risk of frosting at the evaporator heat exchange section (heat exchange chamber), serving as the criterion for triggering anti-frost adjustment. The set temperature range refers to a pre-set acceptable range of supply air temperature. When the supply air temperature is within this range, it meets the refrigeration output requirements for low-temperature grain storage in grain silos.

[0072] When the evaporator wall temperature is detected to be below the frosting temperature threshold, it indicates that there is a risk of frosting at the evaporator heat exchange section (heat exchange chamber). However, if the supply air temperature is still within the set temperature range, it means that the current cooling output meets the grain storage requirements, and there is no need to adjust the cooling power (compressor operating frequency). At this time, only the opening of the flow control valve is increased to supplement heat to the evaporator heat exchange section (heat exchange chamber) by increasing the hot air flow, raising the evaporator wall temperature to eliminate the risk of frosting. The compressor operating frequency remains constant throughout the process to avoid the supply air temperature deviating from the normal range due to changes in cooling capacity. In some embodiments, the adjustment can be done in a quantitative stepwise manner, opening the flow control valve by a fixed percentage each time, re-detecting the evaporator wall temperature after a period of time, and gradually adjusting until the wall temperature returns to above the threshold, avoiding excessive heat supplementation at once that could affect the supply air temperature. For example, each time, the total opening of the flow control valve is increased by 5% to 10%.

[0073] This application embodiment, by installing a flow regulating valve in the defroster and specifying a strategy of increasing the hot air flow rate by only increasing the valve opening when the evaporator wall temperature is low (below the frosting temperature threshold) and the supply air temperature is normal, can eliminate the risk of frosting at the evaporator heat exchange point (heat exchange chamber) while precisely maintaining the stability of the supply air temperature. Using a flow regulating valve to achieve controllable adjustment of the hot air flow rate allows for precise matching of the heat replenishment intensity according to the degree of frosting risk. Combined with a quantitative adjustment method, step-by-step fine-tuning can be achieved, ensuring that frost formation is suppressed at the source, rather than being prevented after the fact.

[0074] In some embodiments, the defroster includes a flow control valve for adjusting the hot air flow rate. See also... Figure 3 , Figure 3 A flowchart illustrating how, according to an embodiment of this application, if the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormal situation. This embodiment provides step S120, which involves adjusting the hot air flow rate and compressor operating frequency according to the abnormal situation if the evaporator wall temperature and / or supply air temperature are abnormal, including: In step S121a, if the evaporator wall temperature is less than the frosting temperature threshold and the supply air temperature is less than the minimum value of the set temperature range, then increase the opening of the flow regulating valve and reduce the compressor operating frequency. In step S122a, if the evaporator wall temperature is less than the frosting temperature threshold and the supply air temperature is greater than the maximum value of the set temperature range, then increase the opening of the flow regulating valve and increase the compressor operating frequency.

[0075] The two steps described above are described in detail below.

[0076] In step S121a, the minimum value of the set temperature range refers to the lower limit of the preset acceptable range for the supply air temperature. A supply air temperature below this value indicates excessive cooling capacity and an excessively cold supply air temperature, failing to meet the temperature requirements for a low-temperature environment in grain storage. In some implementations, the length of the set temperature range is 1 to 2 degrees Celsius. In some embodiments, a reference temperature is first determined, and then the set temperature range is determined based on the reference temperature. For example, the minimum value of the set temperature range is obtained by subtracting the set value from the reference temperature, and the maximum value is obtained by adding the set value to the reference temperature. The difference between the maximum and minimum values ​​of the set temperature range is the length of the set temperature range.

[0077] In some embodiments, a reference temperature is determined based on the type of grain storage in the grain warehouse. For example, the reference temperature for wheat is within the range of 13 to 15 degrees Celsius. If a temperature is selected within the range of 13 to 15 degrees Celsius as the reference temperature T0, then the temperature range is set as [T...]. 0- 0.5℃, T0+0.5℃).

[0078] If the evaporator wall temperature is detected to be below the frosting threshold, it indicates that additional heat needs to be supplied to the evaporator heat exchange area (heat exchange chamber) to suppress frost formation. Simultaneously, if the supply air temperature is below the minimum value of the set range, it indicates that the current cooling capacity is too high, and the excessively cold outlet air does not meet grain storage requirements. At this point, two adjustment actions are performed simultaneously: firstly, the opening of the flow control valve is increased to enhance the hot air delivery flow rate, supplementing heat to the evaporator heat exchange area (heat exchange chamber) to raise the wall temperature and eliminate the risk of frosting; secondly, the compressor operating frequency is reduced to decrease the system's cooling output, offsetting the excessive cooling problem and gradually raising the supply air temperature back to the set temperature range. In some embodiments, the compressor operating frequency adjustment and hot air flow rate adjustment can adopt a quantitative stepwise method, adjusting parameters by a fixed percentage each time, re-detecting the temperature after a set interval, and gradually adjusting until both parameters return to normal, avoiding excessive adjustment at once. For example, each time the total opening of the flow control valve is increased or decreased by 5% to 10%, and each time the total operating power of the compressor is increased or decreased by 3% to 5%.

[0079] In step S122a, the maximum value of the set temperature range refers to the upper limit of the preset qualified air supply temperature range. When the air supply temperature is higher than this value, it means that the system cooling capacity is insufficient and cannot meet the cooling requirements of low-temperature grain storage in the grain warehouse.

[0080] If the evaporator wall temperature is detected to be below the frosting threshold, additional heat is needed to prevent frost formation. If the supply air temperature is above the maximum value of the set temperature range, the supply air temperature needs to be lowered. This is achieved by increasing the opening of the flow control valve to increase the hot air flow to the evaporator heat exchange area (heat exchange chamber), eliminating the risk of frosting. Simultaneously, the compressor operating frequency is increased to enhance the system's cooling output, causing the supply air temperature to drop back to the acceptable range. In some embodiments, the adjustment can also employ a quantitative step-by-step method, adjusting the hot air flow and compressor frequency synchronously at fixed ratios each time, gradually approaching the target state and ensuring that the evaporator wall temperature and supply air temperature return to normal simultaneously.

[0081] This application addresses a dual-abnormal operating condition where there is a risk of frosting at the evaporator heat exchange section (heat exchange chamber) and an abnormal supply air temperature. It employs a control strategy that links hot air flow rate and compressor frequency for coordinated adjustment. This strategy can suppress evaporator frosting at its source—that is, while simultaneously correcting supply air temperature deviations during evaporator heat exchange section (heat exchange chamber) frosting—effectively ensuring the stability of the low-temperature environment for grain storage. When the evaporator wall temperature is below the frosting threshold and the supply air temperature is too low, the hot air flow rate is increased and the compressor operating frequency is decreased simultaneously. This both raises the evaporator wall temperature through supplemental heating to eliminate the risk of frosting and gradually raises the supply air temperature by reducing the system's cooling capacity, avoiding the limitation of a single adjustment failing to simultaneously address both types of abnormalities. When the evaporator wall temperature is below the frosting threshold and the supply air temperature is too high, the hot air flow rate is increased and the compressor operating frequency is increased simultaneously. The matching quantitative adjustment method can precisely control the adjustment range each time, avoid large fluctuations in parameters, improve the stability and accuracy of the adjustment process, and does not require shutdown for defrosting operations. It can continuously maintain the normal cooling output of the refrigeration equipment, ensure the continuous stability of the low temperature environment in the grain warehouse, and meet the operational needs of long-term grain storage.

[0082] Please see Figure 4 , Figure 4 A flowchart illustrating how, according to another embodiment of this application, if the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormal situation. This embodiment provides step S120, which involves adjusting the hot air flow rate and compressor operating frequency according to the abnormal situation if the evaporator wall temperature and / or supply air temperature are abnormal, including: Step S121b: If the evaporator wall temperature is greater than or equal to the frosting temperature threshold and the supply air temperature is less than the minimum value of the set temperature range, then reduce the compressor operating frequency. In step S122b, if the evaporator wall temperature is greater than or equal to the frosting temperature threshold and the supply air temperature is greater than the maximum value of the set temperature range, then increase the compressor operating frequency.

[0083] The two steps described above are described in detail below.

[0084] In step S121b, if the evaporator wall temperature is detected to be above the frosting temperature threshold, it indicates that no additional heating or frost prevention is needed at this time. Simultaneously, if the supply air temperature is below the minimum value of the set temperature range, it indicates that the system's cooling output is excessive, and the supply air temperature is too cold to meet grain storage requirements. At this point, only the compressor is adjusted to reduce its operating frequency, thereby decreasing the system's cooling output and gradually raising the supply air temperature back to the acceptable range. The hot air flow rate remains constant throughout the process to avoid unnecessary additional heating operations interfering with system operation. In some embodiments, the adjustment can be performed in a quantitative stepwise manner, reducing the frequency by a fixed percentage each time, and re-detecting the supply air temperature after a set interval to gradually approach the target state, avoiding excessive adjustment at once.

[0085] In step S122b, if the evaporator wall temperature is found to be within the acceptable range with no risk of frosting, no adjustment to the hot air heating intensity is needed. However, if the supply air temperature exceeds the maximum value of the set temperature range, it indicates insufficient system cooling output, and the excessively high supply air temperature cannot meet the low-temperature requirements for grain storage. In this case, only the compressor is adjusted, gradually increasing its operating frequency to increase the system's cooling output, causing the supply air temperature to gradually return to the acceptable range, while maintaining a stable hot air flow throughout. In some embodiments, the adjustment can also employ a quantitative step-by-step method, increasing the frequency by a fixed percentage each time, and adjusting gradually while periodically checking the temperature to ensure a smooth and controllable adjustment process.

[0086] This application addresses a single abnormal operating condition: normal evaporator wall temperature with no risk of frosting, but abnormal supply air temperature. It employs a control strategy that adjusts only the compressor's operating frequency. This strategy precisely corrects supply air temperature deviations while maintaining a frost-free state at the evaporator heat exchange area (heat exchange chamber), ensuring the stability of the low-temperature environment for grain storage. When the evaporator wall temperature is within acceptable limits and there is no risk of frosting, there is no need to adjust the hot air delivery flow rate. The compressor's operating frequency is adjusted only according to the direction of the supply air temperature deviation: if the supply air temperature is too low, the frequency is reduced to decrease cooling capacity; if the supply air temperature is too high, the frequency is increased to increase cooling capacity. This specifically addresses the single abnormal supply air temperature problem, avoiding unnecessary energy consumption and parameter interference from hot air adjustments, resulting in a simpler and more efficient adjustment logic.

[0087] Please see Figure 5 , Figure 5 A flowchart illustrating pre-adjustment of abnormal conditions based on compressor operating conditions is shown according to an embodiment of this application. This application provides steps for pre-adjusting abnormal conditions based on compressor operating conditions, including: Step S201: Determine the frequency conversion time and frequency conversion amount according to the compressor's frequency conversion plan; Step S202: Determine the adjustment time of the hot air flow rate based on the frequency conversion time, so as to adjust the hot air flow rate according to the frequency conversion value at the adjustment time. The adjustment time is earlier than or equal to the frequency conversion time.

[0088] The two steps described above are described in detail below.

[0089] In step S201, the frequency conversion plan refers to a pre-set compressor operating frequency change scheme, including the planned adjustment time, direction, and magnitude of frequency change. It is typically formulated in advance based on grain silo load variation patterns and grain storage temperature control requirements. For example, timed frequency increases / decreases corresponding to day-night load changes are planned frequency adjustments. Alternatively, the frequency conversion plan may be based on the compressor's own characteristics, such as requiring the compressor to operate at a high frequency for a period after a period of low frequency operation to extend its lifespan. The frequency conversion time refers to the predetermined time point in the frequency conversion plan when the compressor officially changes its operating frequency; it is the execution node where the cooling capacity of the refrigeration system changes. The frequency conversion amount refers to the direction and magnitude of the compressor frequency adjustment, including two directions: frequency increase (frequency increases, cooling capacity increases) and frequency decrease (frequency decreases, cooling capacity decreases), and the corresponding frequency change value, which determines the degree of change in the refrigeration system's cooling output.

[0090] Two core parameters are extracted from the preset variable frequency plan: the moment when the compressor officially performs the frequency change, and the direction and specific magnitude of this frequency adjustment, i.e., the variable frequency amount, so as to clarify in advance the trend and degree of change of cooling capacity that will occur in the refrigeration system.

[0091] In step S202, the adjustment time refers to the point in time when the hot air flow rate is officially adjusted. This time point is set based on the frequency conversion time to ensure that the changes in hot air reheating and cooling capacity are precisely synchronized in timing. An adjustment time earlier than or equal to the frequency conversion time means that the hot air flow rate adjustment is either executed synchronously with the compressor frequency conversion or executed before the frequency conversion, achieving feedforward offsetting and eliminating the lag in feedback adjustment after frequency conversion. Adjustment based on frequency conversion means that the direction and magnitude of the hot air flow rate adjustment match the frequency conversion amount: when the compressor frequency increases and the cooling capacity increases, the hot air flow rate is correspondingly increased to enhance the reheating intensity and offset the increase in cooling capacity; when the compressor frequency decreases and the cooling capacity decreases, the hot air flow rate is correspondingly decreased to reduce the reheating intensity and avoid excessive reheating.

[0092] The adjustment timing of the hot air flow is set based on the frequency conversion time to ensure that the hot air adjustment is no later than the compressor's frequency conversion action; at the same time, the size of the hot air flow is adjusted accordingly based on the direction and amplitude of the frequency conversion. When the compressor plans to increase its frequency, the cooling capacity will increase and the evaporator wall temperature will decrease accordingly. Therefore, the hot air flow is increased in advance or simultaneously to supplement more heat to offset the increase in cooling capacity and prevent the evaporator from frosting due to sudden cooling caused by the frequency conversion. When the compressor plans to decrease its frequency, the cooling capacity will decrease and the evaporator wall temperature will increase accordingly. Therefore, the hot air flow is reduced in advance or simultaneously to reduce the amount of heat supplemented and avoid excessive heat supplementation leading to an increase in the supply air temperature.

[0093] This application embodiment addresses the scenario of planned frequency conversion of the compressor. It employs a feedforward linkage control strategy between hot air flow and compressor frequency conversion. By matching the timing of adjustment with the frequency conversion timing, and matching the amplitude of hot air adjustment with the frequency conversion, fluctuations in evaporator wall temperature and supply air temperature during frequency conversion can be effectively eliminated, improving the stability of the low-temperature environment in the grain silo. Compared to the lagging control method that adjusts based on temperature feedback after frequency conversion, this feedforward logic ensures that the adjustment of hot air supplementary heating is earlier than or synchronized with changes in cooling capacity. This can offset the cooling capacity fluctuations caused by frequency conversion in advance, avoiding the risk of frosting caused by a sudden drop in evaporator wall temperature when the compressor increases frequency, and also avoiding excessive supplementary heating when the compressor decreases frequency, which could lead to excessive supply air temperature. This achieves a smooth transition during the frequency conversion process without significant temperature fluctuations. Meanwhile, this solution can be achieved simply by optimizing the control timing and linkage logic, without the need for additional hardware. It is suitable for grain silos that operate on a planned frequency conversion basis according to day and night load, grain temperature changes, and the characteristics of the compressor itself. This reduces the frequency of feedback adjustments and the start-stop losses of the actuators. Without increasing costs, it further enhances the anti-frost effect and the stability of the air supply temperature, ensuring the uniformity and continuity of the long-term low-temperature grain storage environment in the grain silo.

[0094] Please see Figure 6 , Figure 6 A flowchart illustrating pre-adjustment of abnormal conditions based on compressor operating conditions is shown according to another embodiment of this application. Embodiments of this application provide steps for pre-adjusting abnormal conditions based on compressor operating conditions, including: Step S301: Input the grain warehouse temperature, grain warehouse humidity and the running time of the refrigeration equipment into the pre-trained anomaly prediction model. The anomaly prediction model is used to predict the occurrence of anomalies in the first time period in the future. Step S302: If the prediction results show an abnormal situation, the adjustment time is determined according to the time when the abnormality occurs. The prediction results include the time when the abnormality occurs and the type of abnormality. Step S303: Adjust the hot air flow rate and / or compressor operating frequency at the adjustment time according to the type of abnormality; Step S304: After a second duration following the adjustment time, cancel the adjustment of the hot air flow rate and / or the compressor operating frequency.

[0095] The above four steps are described in detail below.

[0096] First, it needs to be clarified that, in some embodiments, historical temperature data, historical humidity data, and corresponding historical supply air temperature, historical hot air flow, and historical compressor operating frequency are collected during historical operation. The correlation between parameter changes and evaporator wall temperature anomalies (evaporator wall temperature is lower than the frosting temperature threshold) and supply air temperature anomalies (supply air temperature is lower than the minimum value of the set temperature range or higher than the maximum value of the set temperature range) is mined to train an anomaly prediction model. This model can output the occurrence of anomalies in the first time period in the future based on the input real-time parameters.

[0097] Historical temperature and humidity data refer to the temperature and humidity records collected at various times in the grain silo. These are core environmental parameters affecting the probability of evaporator frosting. Higher humidity and lower temperature inside the silo increase the risk of frosting at the evaporator's heat exchange section (heat exchange chamber) (because gas in the grain silo enters the heat exchange chamber through the return air duct, affecting the humidity and temperature of the gas in the return air duct and increasing the likelihood of frosting at the evaporator's heat exchange section (heat exchange chamber)). Historical supply air temperature, historical hot air flow rate, and historical compressor operating frequency are records of operating parameters such as supply air temperature, hot air flow rate, and compressor operating frequency during the past operation of the refrigeration equipment, reflecting the equipment's operating status and adjustment effects under different conditions. The anomaly prediction model is an algorithm model trained based on the above multi-dimensional historical data. By learning the correspondence between environmental parameters, operating parameters, and abnormal operating conditions, it has the ability to predict whether anomalies will occur in the future. The first duration refers to the pre-set prediction time window, i.e., the future time range that the model can predict, such as within the next 15 minutes.

[0098] In some embodiments, the sensor group includes a grain silo temperature sensor and a grain silo humidity sensor, wherein the grain silo temperature sensor is used to acquire the temperature inside the grain silo, and the grain silo humidity sensor is used to acquire the humidity inside the grain silo.

[0099] In step S301, the running time refers to the cumulative time of continuous operation of the refrigeration equipment. The longer the running time, the more obvious the cumulative effect of cold energy in the evaporator heat exchange section (heat exchange chamber) will be, and the risk of frost formation in the evaporator heat exchange section (heat exchange chamber) will change accordingly. It is an important input parameter for predicting anomalies.

[0100] At regular intervals, the current temperature and humidity of the grain warehouse are collected, the running time of the equipment is counted, and these three types of parameters are input into the pre-trained anomaly prediction model in real time. The anomaly prediction model performs calculations based on the patterns obtained from training and outputs the prediction result of whether an abnormal operating condition will occur within the first time period.

[0101] In step S302, the anomaly occurrence time refers to the point in time when the abnormal operating condition predicted by the risk prediction model officially occurs, serving as the benchmark for determining the timing of adjustments. The anomaly type refers to the classification of abnormal situations, typically including evaporator wall temperature below the frosting temperature threshold, abnormally low supply air temperature (below the minimum value of the preset temperature range), and abnormally high supply air temperature (above the maximum value of the preset temperature range), etc. Different anomaly types correspond to different adjustment strategies. Anomaly types include abnormal supply air temperature, abnormal evaporator wall temperature, and simultaneous abnormalities in both supply air temperature and evaporator wall temperature. The adjustment time refers to the point in time when the hot air flow and compressor frequency adjustments are officially executed. This time is earlier than the anomaly occurrence time, ensuring intervention is completed before the anomaly occurs.

[0102] In some embodiments, the prediction results also include anomaly intensity, which refers to the degree of anomaly, such as the degree to which the wall temperature is lower than the frosting temperature threshold, or the degree to which the supply air temperature deviates from the preset temperature range. In other words, anomaly intensity is a parameter that characterizes the severity of abnormal operating conditions; the higher the intensity, the greater the deviation of the parameters (evaporator wall temperature, supply air temperature) from the normal range, and the greater the corresponding adjustment required.

[0103] In some embodiments, the adjustment time can be synchronized with the time when the anomaly occurs, or it can be set in advance to achieve early intervention and eliminate the lag in feedback adjustment.

[0104] When the model predicts that an anomaly will occur within the first time period in the future, an adjustment time no later than the predicted time of the anomaly is set, based on the predicted time of the anomaly occurrence. This ensures that the adjustment action is completed before or simultaneously with the anomaly, avoiding parameter fluctuations caused by remedial measures after the anomaly has formed.

[0105] In step S303, the corresponding adjustment scheme is matched according to the predicted abnormality type: if only the frosting risk abnormality is predicted (evaporator wall temperature is less than the frosting temperature threshold), then only the hot air flow rate is adjusted; if only the supply air temperature is predicted to be outside the preset temperature range, then only the compressor operating frequency is adjusted accordingly; if both types of abnormalities exist at the same time, then both are adjusted simultaneously.

[0106] In some embodiments, the adjustment amplitude can be matched with the abnormal intensity, with a larger adjustment amplitude for higher intensity and a smaller adjustment amplitude for lower intensity, to achieve precise feedforward intervention.

[0107] In step S304, the second duration refers to the pre-set duration of feedforward adjustment, which covers the duration of the abnormal risk, ensuring that the adjustment is effective during the risk period and is reset promptly after the risk has passed. Cancelling the adjustment means restoring the hot air flow rate and compressor operating frequency to their normal operating values ​​before the adjustment, ending the current feedforward intervention, and returning to normal operation.

[0108] Starting from the adjustment time, after a preset second period, the abnormal risk period has completely passed, and the adjustment to the hot air flow and / or compressor frequency is automatically cancelled, allowing the equipment parameters to return to normal operation. It does not remain in the pre-adjusted state indefinitely. This avoids continuous pre-adjustment causing the supply air temperature to deviate from the set range, and also reduces unnecessary energy consumption and component wear.

[0109] This application's embodiments introduce a pre-trained anomaly prediction model, coupled with a feedforward adjustment mechanism that includes early intervention and timed cancellation. This upgrades traditional feedback control, which adjusts only after anomalies occur, to proactive, predictive feedforward control. This effectively reduces the risk of evaporator frosting, further smooths supply air temperature fluctuations, and improves the stability of the low-temperature environment in the grain silo. Based on multi-parameter inputs of grain silo temperature, humidity, and equipment operating time, combined with prediction results including the time, type, and intensity of anomalies, precise adjustment timing and magnitude can be matched. Intervention is completed before anomalies officially occur, avoiding frosting risks and temperature deviations at the source. This prevents parameter oscillations caused by adjustments after anomalies form, ensuring the supply air temperature remains stable. The accompanying timed cancellation mechanism automatically resets operating parameters after the anomaly risk period ends, preventing new temperature deviations caused by continuous pre-adjustment. It also reduces unnecessary adjustment actions and energy consumption, while decreasing the frequency of operation of actuators such as flow control valves and compressors, extending equipment lifespan, and better ensuring the uniformity and stability of the low-temperature grain storage environment during long-term continuous operation of the grain silo.

[0110] Please see Figure 7 , Figure 7 A flowchart of fault handling according to an embodiment of this application is shown. Embodiments of this application provide fault handling steps, including: Step S401: If the evaporator wall temperature is less than the third time of the frosting temperature threshold, restart the flow regulating valve or the refrigeration equipment. Step S402: According to at least one flow adjustment command of the flow regulating valve, the opening degree of the flow regulating valve is controlled sequentially; if the actual hot air flow is the same as the adjusted hot air flow corresponding to the flow adjustment command, the flow regulating valve is adjusted according to the evaporator wall temperature to adjust the hot air flow; if the actual hot air flow is different from the adjusted hot air flow corresponding to the flow adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

[0111] The two steps described above are described in detail below.

[0112] In step S401, the third duration refers to a pre-set duration threshold, which serves as a time reference for determining whether the frost abnormality is a persistent fault, thus avoiding the accidental triggering of the fault handling process due to instantaneous temperature fluctuations.

[0113] Restarting a flow control valve means outputting a reset command to the flow control valve, causing it to reset after power is cut off and then restored. This is used to eliminate soft faults such as temporary jamming of the flow control valve or abnormal control signals. Restarting refrigeration equipment: Performing a complete restart and reset of the entire refrigeration system can eliminate a wider range of temporary faults, such as temporary abnormalities in the control system, and is a more effective troubleshooting method.

[0114] When the evaporator wall temperature is detected to remain below the frosting temperature threshold for an extended period of three hours, it indicates that conventional hot air flow regulation is insufficient to eliminate the risk of frosting, most likely indicating a malfunction in the flow control valve or control system. In this case, a reset operation should be performed first. This can be done by restarting the flow control valve individually or by restarting the entire refrigeration unit. The reset attempt aims to eliminate the temporary soft fault and restore normal operation without manual intervention.

[0115] In some embodiments, when the evaporator wall temperature is detected to be below the frosting temperature threshold for a period of three hours, it indicates that conventional hot air regulation can no longer eliminate the risk of frosting, and the flow control valve is likely malfunctioning. In this case, a restart operation should be performed first. This can be done by restarting the flow control valve individually or by restarting the entire refrigeration unit, attempting to resolve temporary blockages or signal anomalies through resetting. Simultaneously, a rapid fault determination logic is set: if the hot air flow rate is detected to be zero, it indicates that the anti-frosting function has completely failed, requiring no further debugging or verification; the unit should be stopped and an alarm should be triggered. If the hot air flow rate is not zero, subsequent valve function debugging and verification should continue.

[0116] In step S402, the flow rate adjustment command refers to a pre-set standard control command corresponding to the opening degree of the flow regulating valve and the target hot air flow rate. Multiple different opening levels can be set to verify whether the regulating function and accuracy of the flow regulating valve are normal. Sequential opening control means outputting adjustment commands one by one in a preset order to control the flow regulating valve to the corresponding opening degree, completing the multi-level function verification. Actual hot air flow rate refers to the real hot air flow rate in the pipeline collected by the flow detection element, which is the actual basis for verifying the valve's regulating effect. Adjusted hot air flow rate refers to the theoretically corresponding standard hot air flow rate value for each adjustment command, which is the benchmark value for verification and comparison.

[0117] After restarting, at least one preset flow adjustment command is output to the flow regulating valve to control the valve to open to the specified degree. At the same time, the actual hot air flow rate is collected and compared with the theoretical adjustment flow rate corresponding to the command. If the two are consistent, it indicates that the flow regulating valve is functioning normally, and the previous continuous abnormality was a resettable temporary problem. The equipment resumes normal control logic and continues to dynamically adjust the flow regulating valve opening according to the evaporator wall temperature. If the two are inconsistent, it indicates that the flow regulating valve has a hardware jam or adjustment failure, and cannot perform anti-frost adjustment normally. In this case, an alarm is immediately issued and the refrigeration equipment is stopped to avoid severe frost formation at the evaporator heat exchange section (heat exchange chamber) due to faulty operation, which would damage the low-temperature environment of the grain silo.

[0118] In this embodiment, a complete fault protection mechanism is established, including continuous abnormal triggering, restart troubleshooting, flow rate debugging and verification, and graded fault handling. This effectively identifies operational faults in the flow regulating valve and significantly improves the operational reliability and fault response capability of the anti-frost system. When the evaporator wall temperature remains below the frosting temperature threshold for three consecutive hours, the system first attempts to eliminate soft faults such as temporary jamming or signal abnormalities by restarting the flow regulating valve or refrigeration equipment. This allows for rapid recovery of some abnormal operating conditions without manual intervention, reducing the impact of unnecessary shutdowns on the grain storage environment. Simultaneously, a direct shutdown alarm logic is set up for severe faults such as zero hot air flow. This can quickly interrupt continuous operation under severe faults, preventing rapid frosting at the evaporator heat exchange section (heat exchange chamber) from causing a sharp drop in heat exchange efficiency and significant fluctuations in warehouse temperature. The system is equipped with a verification mechanism for multi-level flow rate adjustment commands, which can accurately determine whether the flow regulating valve is functioning properly and accurately distinguish between recoverable temporary faults and hardware failures. This avoids accidental shutdowns that could affect the stability of the grain storage environment and also prevents the continuous operation of faulty flow regulating valves from causing the anti-frost function to completely fail. At the same time, the alarm and shutdown linkage mechanism can promptly prompt maintenance personnel to troubleshoot the fault, ensuring the stability and safety of the equipment during long-term continuous operation. It is suitable for the needs of unattended operation and long-term continuous operation of grain silos.

[0119] Please see Figure 8 , Figure 8 A flowchart of fault handling according to another embodiment of this application is shown. Embodiments of this application provide fault handling steps, including: Step S501: If the supply air temperature is not within the fourth time interval of the set temperature range, restart the compressor or refrigeration equipment. Step S502: According to at least one frequency adjustment command of the compressor, the compressor operating frequency is controlled sequentially; if the actual air supply temperature is the same as the adjusted air supply temperature corresponding to the frequency adjustment command, the compressor operating frequency is adjusted according to the relationship between the actual air supply temperature and the set temperature range; if the actual air supply temperature is different from the adjusted air supply temperature corresponding to the frequency adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

[0120] The two steps described above are described in detail below.

[0121] In step S501, the fourth duration refers to a pre-set duration threshold, used to distinguish between instantaneous temperature fluctuations and persistent anomalies, avoiding accidental triggering of the fault handling process; only when the cumulative duration of the supply air temperature deviation reaches this value is it determined to be an abnormal state of conventional frequency regulation failure. Restarting the compressor refers to the operation of powering on the compressor after a power outage reset, used to eliminate soft faults such as compressor drive abnormalities, control signal drift, and temporary program malfunctions, and is a low-cost preliminary fault diagnosis method. Restarting the refrigeration equipment refers to performing a full power outage restart on the entire refrigeration equipment, which can cover a wider range of soft faults such as control system abnormalities and sensor signal deviations, providing a broader scope of troubleshooting.

[0122] When the supply air temperature is detected to be consistently outside the set temperature range for a cumulative period of four hours, it indicates that conventional compressor frequency adjustment is no longer able to bring the supply air temperature back to the acceptable range, most likely indicating a malfunction in the compressor or control system. In this case, a reset operation should be performed first. This can be done by restarting the compressor individually or by restarting the entire refrigeration system. The reset attempt aims to eliminate the temporary soft fault and restore normal refrigeration regulation without manual intervention.

[0123] In another embodiment of this application, after restarting the compressor or refrigeration equipment, the hot air flow rate is first detected: if the hot air flow rate is zero, it indicates that the defrosting system has completely failed, and continued operation will cause the evaporator to frost quickly, further deteriorating the cooling effect. Therefore, the compressor is directly shut down and an alarm is issued, without needing to proceed with the subsequent debugging process; if the hot air flow rate is not zero, it indicates that the defrosting system is basically usable, and the abnormality is most likely from the compressor or the control end. At this time, a reset operation is performed first, and the compressor can be restarted individually or the entire refrigeration equipment can be restarted to try to eliminate the temporary soft fault through reset before proceeding to the subsequent performance verification stage.

[0124] In step S502, the frequency adjustment command refers to a pre-stored standard control command. Each command corresponds to a fixed compressor operating frequency and a theoretical target air supply temperature. Single or multiple commands at different frequency levels can be set to verify the compressor's refrigeration regulation accuracy and functional integrity. Sequentially controlling the operating frequency means outputting adjustment commands to the compressor one by one in a preset order, controlling its operation to the corresponding frequency, completing multi-level refrigeration performance verification, avoiding the randomness of single-level verification, and ensuring accurate and reliable verification results. The actual air supply temperature refers to the real air supply temperature value collected by the temperature sensor in the air supply duct, which is the actual basis for judging whether the compressor's refrigeration regulation effect meets the standard. The adjusted air supply temperature refers to the theoretically corresponding standard air supply temperature value for each frequency adjustment command, which is the benchmark value for verification and comparison.

[0125] This application's embodiment employs a tiered fault handling mechanism—triggered by continuous abnormal supply air temperature, followed by restart troubleshooting and frequency adjustment verification—to accurately identify the compressor's operating status, effectively distinguish between temporary soft faults and hardware failures, and significantly improve the temperature control reliability and fault response capability of the refrigeration system. When the supply air temperature deviates from the set temperature range for four consecutive hours, the compressor or refrigeration equipment is restarted to attempt to eliminate soft faults such as drive abnormalities and signal drift. This allows for rapid recovery of some abnormal operating conditions without manual intervention, reducing unnecessary downtime and preventing frequent shutdowns that could cause significant temperature fluctuations in the grain silo, thus ensuring the continuity and stability of the low-temperature environment for grain storage. After restarting, standardized frequency adjustment commands are used to verify the refrigeration performance, accurately determining whether the compressor's temperature regulation capability is normal. This avoids ineffective shutdowns caused by misjudged faults and prevents the continuous operation of faulty compressors from leading to prolonged excessive supply air temperature and uncontrolled silo environment. Furthermore, the alarm and shutdown linkage mechanism promptly alerts maintenance personnel to troubleshoot the fault. The entire mechanism requires no additional complex hardware; it can automatically detect and classify compressor failures simply by optimizing the control logic. It is suitable for unattended operation and long-term continuous operation of grain silos, effectively reducing the impact of equipment failures on grain storage safety and improving the stability and safety of refrigeration equipment operation.

[0126] In some embodiments, a grain silo refrigeration device is characterized in that the refrigeration device includes: a compressor for compressing and heating a gaseous refrigerant; a condenser connected to the compressor via a refrigerant pipeline for cooling and liquefying the gaseous refrigerant output from the compressor; an evaporator connected to both the condenser and the compressor via refrigerant pipelines for absorbing heat from the gas in the heat exchange chamber outside the refrigerant pipeline, evaporating the liquid refrigerant output from the condenser to the evaporator into a gaseous refrigerant, the gaseous refrigerant being drawn to the compressor via the refrigerant pipeline; a defroster for collecting hot air and delivering hot air to the heat exchange chamber of the evaporator via a hot air delivery pipeline; wherein the heat exchange chamber is connected to the grain silo via a supply air pipeline and a return air pipeline, the gas in the heat exchange chamber is delivered to the grain silo via the supply air pipeline, and the gas in the grain silo is delivered to the heat exchange chamber via the return air pipeline for heat exchange; a sensor group for acquiring the evaporator wall temperature and the supply air temperature of the supply air pipeline; and a control unit configured to execute the control method of any of the above embodiments.

[0127] In some embodiments, the control unit employs a PID adaptive control algorithm to adjust the hot air flow rate and compressor operating frequency according to the evaporator wall temperature and the supply air temperature.

[0128] In some embodiments, generally speaking, the defroster in the technical solution described in this application can basically prevent frost formation at the heat exchange section (heat exchange chamber) of the evaporator, and the evaporator is unlikely to require defrosting. However, in special circumstances or under fault conditions, frost may form at the heat exchange section (heat exchange chamber) of the evaporator. In such cases, the sensor group also includes a frost thickness sensor to detect the frost thickness of the evaporator in real time. When the frost thickness exceeds the set thickness, the hot air flow rate is increased, and the compressor operating frequency is increased accordingly to quickly eliminate the frost and further improve the anti-frost effect.

[0129] Figure 9 A block diagram of a computer device structure for implementing a control method for a grain silo refrigeration device according to an embodiment of this application is shown.

[0130] It should be noted that, Figure 9 The computer device 800 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0131] like Figure 9 As shown, the computer device 800 includes a central processing unit (CPU) 801, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 802 or programs loaded from storage section 808 into random access memory (RAM). The RAM 803 also stores various programs and data required for device operation. The CPU 801, ROM 802, and RAM 803 are interconnected via a bus 804. An input / output interface 805 (I / O interface) is also connected to the bus 804.

[0132] The following components are connected to the input / output interface 805: an input section 806 including a keyboard, mouse, etc.; an output section 807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a local area network card, modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the input / output interface 805 as needed. A removable medium 811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 810 as needed so that computer programs read from it can be installed into the storage section 808 as needed.

[0133] Specifically, according to embodiments of this application, the processes described in the various method flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 809, and / or installed from removable medium 811. When the computer program is executed by central processing unit 801, it performs the various functions defined in the device of this application.

[0134] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium, a computer-readable storage medium, or any combination thereof. The computer-readable storage medium is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor devices, apparatuses, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution device, apparatus, or device. In this application, the computer-readable signal medium can include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such transmitted data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution device, apparatus, or apparatus. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0135] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of devices, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based device that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0136] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this application, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0137] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the methods according to the embodiments of this application.

[0138] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0139] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A control method for a grain silo refrigeration equipment, characterized in that, Refrigeration equipment includes: A compressor is used to compress and heat gaseous refrigerant. A condenser, which is connected to the compressor via a refrigerant pipeline, is used to cool and liquefy the gaseous refrigerant output by the compressor; An evaporator is connected to the condenser and the compressor via refrigerant pipes. It is used to absorb heat from the gas in the heat exchange chamber outside the refrigerant pipes and evaporate the liquid refrigerant output from the condenser to the evaporator into gaseous refrigerant. The gaseous refrigerant is then drawn to the compressor through the refrigerant pipes. A defroster is used to collect hot air and deliver it to the heat exchange chamber of the evaporator through a hot air delivery duct. The heat exchange chamber is connected to the grain silo via air supply pipes and return air pipes. The air supply pipes transport the gas in the heat exchange chamber to the grain silo, and the gas in the grain silo is transported to the heat exchange chamber via the return air pipes for heat exchange. Sensor array used to acquire evaporator wall temperature and supply air temperature in air duct; The control method includes: Obtain the evaporator wall temperature and the supply air temperature; If the evaporator wall temperature and / or supply air temperature are abnormal, adjust the hot air flow rate and compressor operating frequency accordingly until the evaporator wall temperature and supply air temperature are normal.

2. The control method according to claim 1, characterized in that, The defroster collects hot air from the space containing at least one of the compressor and the condenser.

3. The control method according to claim 1, characterized in that, The defroster includes a flow regulating valve for adjusting the hot air flow rate; If the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency shall be adjusted accordingly, including: If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is within the set temperature range, the opening of the flow regulating valve is increased to increase the hot air flow.

4. The control method according to claim 1, characterized in that, The defroster includes a flow regulating valve, which is used to adjust the hot air flow rate; If the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormality. This also includes: If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is lower than the minimum value of the set temperature range, then the opening of the flow regulating valve is increased and the operating frequency of the compressor is reduced. If the evaporator wall temperature is lower than the frosting temperature threshold and the supply air temperature is higher than the maximum value of the set temperature range, then the opening of the flow regulating valve is increased, and the operating frequency of the compressor is increased.

5. The control method according to claim 1, characterized in that, If the evaporator wall temperature and / or supply air temperature are abnormal, the hot air flow rate and compressor operating frequency are adjusted accordingly based on the abnormality. This also includes: If the evaporator wall temperature is greater than or equal to the frosting temperature threshold and the air supply temperature is less than the minimum value of the set temperature range, then the compressor operating frequency is reduced. If the evaporator wall temperature is greater than or equal to the frosting temperature threshold, and the air supply temperature is greater than the maximum value of the set temperature range, then the compressor operating frequency is increased.

6. The control method according to claim 1, characterized in that, The method further includes: Based on the compressor's frequency conversion plan, determine the frequency conversion timing and frequency conversion amount; Based on the frequency conversion time, the adjustment time of the hot air flow rate is determined, so as to adjust the hot air flow rate according to the frequency conversion amount at the adjustment time, wherein the adjustment time is earlier than or equal to the frequency conversion time.

7. The control method according to claim 1, characterized in that, The method further includes: The grain warehouse temperature, grain warehouse humidity, and refrigeration equipment operating time are input into a pre-trained anomaly prediction model, which is used to predict the occurrence of anomalies in the first time period. If the prediction results show an anomaly, the adjustment time is determined based on the time when the anomaly occurs. The prediction results include the time when the anomaly occurs and the type of anomaly. Depending on the type of anomaly, the hot air flow rate and / or compressor operating frequency are adjusted at the adjustment time. Two hours after the adjustment time, cancel the adjustment of hot air flow and / or compressor operating frequency.

8. The control method according to claim 1, characterized in that, The defroster includes a flow regulating valve for adjusting the hot air flow rate, and the method further includes: If the evaporator wall temperature is less than the third time threshold for frosting, then restart the flow regulating valve or the refrigeration equipment. According to at least one flow adjustment command of the flow regulating valve, the opening degree of the flow regulating valve is controlled sequentially; if the actual hot air flow is the same as the adjusted hot air flow corresponding to the flow adjustment command, the flow regulating valve is adjusted according to the evaporator wall temperature to adjust the hot air flow; if the actual hot air flow is different from the adjusted hot air flow corresponding to the flow adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

9. The control method according to claim 1, characterized in that, The method further includes: If the air supply temperature is not within the fourth time interval of the set temperature range, then restart the compressor or refrigeration equipment; According to at least one frequency adjustment command of the compressor, the operating frequency of the compressor is controlled sequentially; if the actual air supply temperature is the same as the adjusted air supply temperature corresponding to the frequency adjustment command, the operating frequency of the compressor is adjusted according to the relationship between the actual air supply temperature and the set temperature range; if the actual air supply temperature is different from the adjusted air supply temperature corresponding to the frequency adjustment command, an alarm is issued and the refrigeration equipment is controlled to stop operating.

10. A grain storage refrigeration device, characterized in that, Refrigeration equipment includes: A compressor is used to compress and heat gaseous refrigerant. A condenser, which is connected to the compressor via a refrigerant pipeline, is used to cool and liquefy the gaseous refrigerant output by the compressor; An evaporator is connected to the condenser and the compressor via refrigerant pipes. It is used to absorb heat from the gas in the heat exchange chamber outside the refrigerant pipes and evaporate the liquid refrigerant output from the condenser to the evaporator into gaseous refrigerant. The gaseous refrigerant is then drawn to the compressor through the refrigerant pipes. A defroster is used to collect hot air and deliver it to the heat exchange chamber of the evaporator through a hot air delivery duct. The heat exchange chamber is connected to the grain silo via air supply pipes and return air pipes. The air supply pipes transport the gas in the heat exchange chamber to the grain silo, and the gas in the grain silo is transported to the heat exchange chamber via the return air pipes for heat exchange. Sensor array used to acquire evaporator wall temperature and supply air temperature in air duct; A control unit configured to perform the control method according to any one of claims 1 to 9.

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