Refrigeration house unit, refrigeration house and control method of refrigeration house unit

Abstract

The invention relates to a refrigeration house unit, a refrigeration house and a control method of the refrigeration house unit, relates to the technical field of refrigeration house equipment, and aims to solve the problem that an air cooler cannot stably refrigerate due to relatively high air humidity in the refrigeration house. The refrigeration house unit comprises a condenser and an air cooler, wherein the condenser comprises a condenser and a compressor. The air cooler comprises an evaporator, a throttler and a first fan, the compressor, the condenser, the throttler and the evaporator are sequentially connected to form a refrigerant loop, and the first fan is used for driving return air to flow through the evaporator. In the flowing direction of the return air, the air cooler is provided with a moisture absorber on the upstream of the evaporator, and the moisture absorber is used for absorbing moisture in the return air.

Description

Technical Field

[0001] This application relates to the field of cold storage equipment technology, and in particular to a cold storage unit, a cold storage, and a control method for the cold storage unit. Background Technology

[0002] Cold storage facilities used for storing aquatic products and other live animals require a high humidity environment to maintain the survival conditions of these animals, which necessitates maintaining high air humidity within the cold storage.

[0003] However, during the cooling process of the return air by the evaporator, the moisture in the high-humidity return air condenses into frost on the evaporator surface, causing a sharp drop in humidity inside the storage room and reducing the heat exchange efficiency between the evaporator and the return air. To maintain normal operation, the system needs to perform defrosting operations frequently, which not only increases energy consumption but also causes drastic temperature fluctuations inside the storage room, disrupting the dormant preservation state of aquatic products. Summary of the Invention

[0004] This application provides a cold storage unit, a cold storage, and a control method for the cold storage unit, aiming to solve the problem that the high air humidity in the cold storage causes the air cooler to fail to provide stable cooling.

[0005] In a first aspect, embodiments of this application provide a cold storage unit, including a condenser and a fan. The condenser includes a condenser and a compressor. The fan includes an evaporator, a throttling device, and a first fan. The compressor, condenser, throttling device, and evaporator are connected in sequence to form a refrigerant circuit. The first fan is used to drive return air through the evaporator. Along the flow direction of the return air, a desiccant is installed upstream of the evaporator on the fan, and the desiccant is used to absorb moisture from the return air.

[0006] In some implementations, the cold storage unit includes a temperature sensor, a humidity sensor, and a control module. The humidity sensor and temperature sensor are positioned upstream of the dehumidifier, along the direction of return air flow. The temperature sensor, humidity sensor, compressor, first fan, and control module are electrically connected.

[0007] In some implementations, the air cooler includes a heating element located at the desiccant to heat it. The heating element is electrically connected to a control module, and the desiccant is a porous metal-organic frame.

[0008] In some implementations, the air cooler includes an air cooler casing, which has a first return air inlet and a first air outlet. An evaporator, a throttling device, and a first fan are installed inside the air cooler casing. A desiccant is installed at the first return air inlet, and the first fan is used to drive the return air to flow sequentially through the desiccant, the evaporator, and the first air outlet.

[0009] In some implementations, the cold storage unit includes an oxygen sensor positioned upstream of the dehumidifier along the direction of return air flow. The oxygen sensor is used to detect the oxygen concentration in the return air and is electrically connected to the control module.

[0010] In some implementations, the cold storage unit includes a humidifier, which comprises a water tank, a perforated humidifier, and a second fan. The water tank has a second return air inlet and a second air outlet. The perforated humidifier and the second fan are located inside the water tank, and the second fan drives air to flow sequentially through the perforated humidifier and the second air outlet.

[0011] In some implementations, the water tank is also equipped with a fresh air inlet, which is used to introduce fresh air into the water tank. The fresh air inlet and the second return air inlet are configured to be selectively activated.

[0012] In some implementations, the evaporator also includes a drip tray and a drain pipe. The drip tray is located below the evaporator and is used to collect condensate. The drain pipe connects the drip tray and the water tank.

[0013] In some implementations, the humidifier also includes a first air damper and a second air damper. The first air damper is located at the fresh air inlet and is used to control the opening or closing of the fresh air inlet. The second air damper is located at the second return air inlet and is used to control the opening or closing of the second return air inlet.

[0014] In some implementations, the humidifier also includes a return air duct, one end of which is connected to a second return air inlet, and the other end of which is located at the dehumidifier.

[0015] Secondly, this application provides a cold storage facility, including a storage room and the cold storage unit mentioned in the first aspect. A cold air blower is installed in the storage room, and a condenser is installed outside the storage room. The cold air blower and the condenser are connected by a refrigerant pipeline for the circulation of refrigerant.

[0016] Thirdly, embodiments of this application provide a control method for a cold storage unit, used to control the cold storage unit in the first aspect, the control method including: Obtain the set temperature and cooling rate parameters of the cold storage unit.

[0017] Control the start-up of the condenser and air cooler.

[0018] Control the operating power of the compressor and the first fan until the return air reaches the set temperature according to the cooling rate parameter.

[0019] Adjust the operating power of the compressor and the first fan to keep the return air within the set temperature range.

[0020] In some implementations, control methods include: Obtain the set humidity and first return air humidity of the cold storage unit.

[0021] Determine if the humidity of the first return air is lower than the set humidity.

[0022] If the humidity of the first return air is lower than the set humidity, check whether the compressor and the first fan are started.

[0023] If the compressor and the first fan start, control the second return air vent to open and start the second fan.

[0024] If the compressor and the first fan are not started, control the second return air vent to open, start the second fan, and control the heating element to start.

[0025] After the first preset time, the humidity of the second return air is obtained.

[0026] Determine if the humidity of the second return air is lower than the set humidity.

[0027] If the humidity of the second return air is less than the set humidity, maintain the current operating status and repeatedly collect the temperature of the second return air after the first preset time.

[0028] If the humidity of the second return air is greater than or equal to the set humidity, the control will shut down the second return air vent and the second fan.

[0029] In some implementations, after controlling the opening of the second return air vent, starting the second fan, and controlling the start of the heating element, the control methods include: After the second preset time, the cumulative time for the heating element to start is obtained.

[0030] Determine whether the cumulative time is greater than or equal to the first threshold.

[0031] If the cumulative time is greater than or equal to the first threshold, the heating element is turned off and the cumulative time is reset to zero.

[0032] If the cumulative time is less than the first threshold, the cumulative time for the heating element to start is retrieved again after the second preset time.

[0033] In some implementations, control methods include: Obtain the set oxygen concentration of the cold storage unit and the first oxygen concentration of the return air; Determine whether the first oxygen concentration is less than the set oxygen concentration; If the first oxygen concentration is less than the set oxygen concentration, control the fresh air inlet to open and start the second fan; After the third preset time, the second oxygen concentration of the return air is obtained; Determine whether the second oxygen concentration is less than the set oxygen concentration; If the second oxygen concentration is less than the set oxygen concentration, maintain the current operating state and repeatedly collect the second oxygen concentration after a third preset time; If the second oxygen concentration is greater than or equal to the set oxygen concentration, the second fan and the fresh air inlet are shut down.

[0034] The technical solutions provided in this application have the following advantages compared with the prior art: By installing a desiccant upstream of the evaporator in the evaporator, moisture in the return air is effectively absorbed, significantly reducing the humidity of the return air flowing through the evaporator. This reduces the amount of frost forming on the evaporator surface, avoiding the decreased refrigeration efficiency, humidity fluctuations, and additional defrosting energy consumption caused by frequent evaporator frosting in high-humidity environments, as is common in traditional cold storage. This solution helps maintain the required high humidity environment within the cold storage and avoids temperature fluctuations caused by frequent defrosting, providing more stable low-temperature and high-humidity preservation conditions for keeping aquatic products alive after removal from water. Attached Figure Description

[0035] 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.

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0038] Figure 1 This application provides a schematic diagram of the internal structure of a cold storage facility. Figure 2 A schematic diagram of the connection structure of a cold storage unit provided in an embodiment of this application; Figure 3 for Figure 1 An exploded structural diagram of the cold storage unit shown in the image; Figure 4 An electrical connection diagram of a cold storage unit provided in an embodiment of this application; Figure 5 for Figure 1 Another exploded structural diagram of the cold storage unit shown in the image; Figure 6 A flowchart illustrating the control method for a first type of cold storage unit provided in this application embodiment; Figure 7A flowchart illustrating the control method for a second type of cold storage unit provided in this application embodiment; Figure 8 This is a schematic diagram of the connection structure of a control module provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures: 100. Cold storage; 10. Cold storage unit; 11. Condenser; 111. Compressor; 112. Condenser; 113. Outdoor fan; 114. First grille; 12. Air cooler; 121. Evaporator; 122. Throttling device; 123. First fan; 124. Dehumidifier; 125. Air cooler casing; 1251. First return air vent; 1252. First air outlet; 126. Heating element; 127. Drain pipe; 131. Control module; 1311. Processor; 1312. Communication interface; 1313. Memory; 1314. Communication bus; 132. Temperature sensor; 133. Humidity sensor; 134. Oxygen sensor; 14. Humidifier; 141. Water tank; 1411. Second return air vent; 1412. Second air outlet; 1413. Fresh air vent; 142. Multi-hole humidifier; 143. Second fan; 144. First damper; 145. Second damper; 146. Return air duct; 147. Second grille; 20. Storage room. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0042] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0043] With the improvement of economic level and the improvement of residents' quality of life, the consumption demand for aquatic products has shifted from traditional frozen and pickled products to fresh products, and the market acceptance of fresh aquatic products has increased significantly.

[0044] However, due to geographical distribution, climate conditions, and ecological environment limitations, aquatic products rely on preservation technologies to maintain a balance between supply and demand in the farming, transportation, and sales stages. Seasonal aquatic products, such as crayfish and hairy crabs, have distinct peak and off-peak seasons in their farming cycles, resulting in a long-term shortage of fresh products in the market.

[0045] Furthermore, aquatic products are susceptible to disease and mechanical damage during processing and transportation, leading to decreased survival rates and impacting product quality. Key control factors for survival after removal from water include temperature, humidity, and oxygen concentration. Cold-blooded aquatic products such as crayfish and crabs can be induced into a dormant state through low temperatures, effectively reducing their metabolic rate and achieving long-term survival while maintaining weight and nutritional value. Since these aquatic products rely on their gills to absorb oxygen from the air, oxygen must first dissolve in the water film on the gill surface before being absorbed. Therefore, maintaining a moist environment around the gills is crucial for improving survival rates. Thus, the ambient humidity needs to be consistently maintained above 90%. Simultaneously, the respiration of aquatic products in a closed cold storage environment continuously consumes oxygen, necessitating ventilation and oxygenation to prevent death from oxygen depletion.

[0046] Cold storage facilities for live aquatic products require a high humidity environment to sustain their survival, necessitating the maintenance of high air humidity. However, as the evaporator cools the return air, the moisture in the humid return air condenses on the evaporator surface, causing a sharp drop in humidity and reducing the heat exchange efficiency between the evaporator and the return air. To maintain normal operation, the system must frequently perform defrosting operations, increasing energy consumption and causing drastic temperature fluctuations, disrupting the dormant preservation state of the aquatic products.

[0047] Please see Figures 1 to 8 This application provides a cold storage unit, a cold storage, and a control method for the cold storage unit, aiming to solve the problem that the high air humidity in the cold storage causes the air cooler to fail to provide stable cooling.

[0048] Firstly, embodiments of this application provide a cold storage unit, such as... Figure 1 As shown, the cold storage unit 10 includes a condenser 11 and an air cooler 12. The condenser 11 is usually located outside the cold storage, serving as an outdoor unit to dissipate heat from the refrigerant. The air cooler 12 is located inside the cold storage, serving as an indoor unit to circulate and cool the indoor air.

[0049] Reference Figure 2 The condenser 11 includes a condenser 112 and a compressor 111. The air cooler 12 includes an evaporator 121, a throttle 122 and a first fan 123. The compressor 111, condenser 112, throttle 122 and evaporator 121 are connected in sequence to form a refrigerant circuit. The first fan 123 is used to drive the return air to flow through the evaporator 121.

[0050] For example, such as Figure 2 As shown, the condenser 11 can consist of a condenser 112 and a compressor 111. The condenser 112 can be a finned tube heat exchanger. An outdoor fan 113 drives air to flow through the condenser 112 to transfer the heat released during the refrigerant condensation process to the outside air. The compressor 111 can be a reciprocating compressor 111 or a scroll compressor 111. Its function is to increase the pressure and temperature of the refrigerant so that it can condense and release heat smoothly in the condenser 112.

[0051] The air cooler 12 can be composed of an evaporator 121, a throttle valve 122, and a first fan 123. The evaporator 121 can be a finned-tube heat exchanger, which absorbs heat from the air inside the cold storage 100 through the evaporation of refrigerant for internal cooling and dehumidification. The throttle valve 122 can be a capillary tube or an expansion valve for reducing the pressure of the refrigerant. The first fan 123 can be an axial fan or a centrifugal fan, whose function is to force the return air of the cold storage 100 to circulate through the evaporator 121 to achieve efficient heat exchange.

[0052] The first fan 123 can be installed on the air outlet side of the evaporator 121 to blow the return air cooled by the evaporator 121 into the cold storage 100. Alternatively, the first fan 123 can be installed on the air inlet side of the evaporator 121 to draw and drive the return air to the evaporator 121 for cooling.

[0053] Based on this, such as Figure 3 As shown, along the flow direction of the return air, the air cooler 12 has a desiccant 124 installed upstream of the evaporator 121. The desiccant 124 is used to absorb moisture from the return air. The desiccant 124 can be made of moisture-absorbing materials such as silica gel or calcium chloride, filled with a granular or honeycomb structure, which reduces air resistance while increasing the contact area with the return air. The desiccant 124 is placed before the return air enters the evaporator 121, ensuring that the moisture contained in the return air is absorbed by the desiccant 124 before it comes into contact with the surface of the evaporator 121, thereby reducing the relative humidity of the return air.

[0054] For example, when high-humidity return air flows through the dehumidifier 124, the desiccant traps water molecules in the air through physical or chemical adsorption, reducing the relative humidity of the return air. Thus, the return air flowing through the evaporator 121 experiences a significant reduction in humidity, thereby reducing or preventing frost formation on the surface of the evaporator 121.

[0055] Specifically, by installing a desiccant 124 upstream of the evaporator 121 of the air cooler 12, moisture in the return air is effectively absorbed, significantly reducing the humidity of the return air flowing through the evaporator 121. This reduces the amount of frost on the surface of the evaporator 121, avoiding the decreased refrigeration efficiency, humidity fluctuations within the cold storage, and additional defrosting energy consumption caused by frequent frost formation on the evaporator 121 in high-humidity environments, as is common in traditional cold storage. This solution helps to stably maintain the required high humidity environment within the cold storage and avoids temperature fluctuations caused by frequent defrosting, providing more stable low-temperature and high-humidity preservation conditions for keeping aquatic products alive after removal from water.

[0056] For example, such as Figure 3 and Figure 5As shown, the air cooler 12 includes an air cooler housing 125. The air cooler housing 125 is provided with a first return air inlet 1251 and a first air outlet 1252. An evaporator 121, a throttle 122 and a first fan 123 are disposed inside the air cooler housing 125. A dehumidifier 124 is disposed at the first return air inlet 1251. The first fan 123 is used to drive the return air to flow sequentially through the dehumidifier 124, the evaporator 121 and the first air outlet 1252.

[0057] The air cooler casing 125 is the main structure of the air cooler 12. It is typically a shell with a certain strength and sealing properties, used to house the internal components of the air cooler 12 and guide airflow. Its main function is to provide protection for the internal components, preventing external environmental influences on the components, while forming a closed air passage to ensure that air flows along a preset path, thereby improving heat exchange efficiency.

[0058] The air cooler casing 125 can be made of sheet metal (such as galvanized steel or stainless steel) or high-strength plastic, and is usually insulated internally to reduce energy loss. The first return air vent 1251 is an opening on the air cooler casing 125 for introducing return air from the cold storage, while the first air outlet 1252 is an opening for discharging treated (dehumidified, cooled) air. The first air outlet 1252 can be a strip-shaped perforation structure, corresponding to the first fan 123 of the cross-flow structure. Alternatively, two or more first air outlets 1252 can be provided, corresponding one-to-one with the corresponding number of first fans 123 of the axial flow structure.

[0059] The evaporator 121, the expansion joint 122, and the first fan 123, as the core functional components of the air cooler 12, are integrated inside the air cooler casing 125. Typically, the evaporator 121 absorbs heat from the return air and evaporates the refrigerant flowing inside. The expansion joint 122 is used to throttle and reduce the pressure of the refrigerant, facilitating the evaporation and heat absorption of the liquid refrigerant within the evaporator 121 after it flows through the expansion joint 122. The first fan 123 drives indoor air to flow sequentially through the first return air inlet 1251, the evaporator 121, and the first air outlet 1252.

[0060] By installing a dehumidifier 124 at the first return air inlet 1251, it is ensured that all return air entering the air cooler 125 first comes into contact with the dehumidifier 124, preventing moisture in the return air from condensing and frosting on the surface of the evaporator 121, so that the evaporator 121 maintains a high heat exchange efficiency and reduces or avoids the frequency and energy consumption of defrosting.

[0061] For example, the dehumidifier 124 can have a porous structure to reduce airflow resistance. The dehumidifier 124 can be made of a renewable adsorbent material (such as silica gel, molecular sieves, or metal-organic frameworks), and the water content adsorbed within the dehumidifier 124 can be reduced by heating to achieve circulating dehumidification.

[0062] In some embodiments, such as Figure 4 As shown, the cold storage unit 10 includes a temperature sensor 132, a humidity sensor 133, and a control module 131. The humidity sensor 133 and the temperature sensor 132 are located upstream of the dehumidifier 124 along the direction of return air flow.

[0063] Temperature sensor 132 is a device used to detect the temperature of return air in cold storage in real time. It can use common temperature measuring elements such as thermistors, thermocouples, or platinum resistance thermometers. These elements utilize the characteristics of their own physical quantities such as resistance, voltage, or current changing with temperature to convert temperature signals into electrical signals for output.

[0064] The humidity sensor 133 is a device used to detect the humidity of the return air in a cold storage facility in real time. It can be a capacitive humidity sensor, a resistive humidity sensor, or a thermal conductivity humidity sensor. For example, a capacitive humidity sensor measures humidity based on the principle that the dielectric constant changes with humidity, while a resistive humidity sensor measures humidity based on the principle that the resistivity of a conductive material changes with humidity.

[0065] The temperature sensor 132 and the humidity sensor 133 are positioned upstream of the dehumidifier 124 along the direction of return air flow. This ensures that the sensors can detect the temperature and humidity parameters of the raw return air that has not been treated by the dehumidifier 124, thereby providing the control module 131 with the most accurate internal environmental parameters of the cold storage. The sensors can be installed near the return air vent of the air cooler 12, or inside the air cooler housing 125, before the dehumidifier 124. However, they should be protected from direct airflow impact or condensation to ensure the accuracy of the measurement data.

[0066] The temperature sensor 132 and the humidity sensor 133 can be two independent components. Alternatively, they can be integrated into a single unit; there is no limitation on this.

[0067] The control module 131 is the core control unit of the cold storage unit. It is responsible for receiving signals from the temperature sensor 132 and the humidity sensor 133, processing and analyzing these data, and outputting control commands according to the preset control logic. This control module 131 can be composed of a microcontroller (MCU), a programmable logic controller (PLC), an industrial computer, or an embedded system. It typically includes a processor, memory, and necessary input / output interfaces, and runs preset control algorithms and programs. The control module 131 should have multi-channel signal input / output capabilities, be able to process analog and digital signals, and possess a certain amount of computing and storage capacity to implement complex control strategies.

[0068] like Figure 4 As shown, temperature sensor 132, humidity sensor 133, compressor 111, first fan 123, and control module 131 are electrically connected. A data transmission channel is established between the sensors and control module 131, as well as an instruction transmission channel between control module 131 and the actuators (such as compressor 111 and first fan 123), thereby enabling information exchange and the issuance of control commands. This electrical connection can be achieved via wired means (such as signal lines or control lines) or wireless means (such as Wi-Fi, Bluetooth, Zigbee, etc.). Wired connections typically use shielded cables to reduce interference, while wireless connections require a corresponding communication module.

[0069] Through the above scheme, the control module 131 can acquire the temperature and humidity information of the untreated raw return air inside the cold storage in real time and accurately. These real-time environmental parameters are input to the control module 131 as feedback signals. The control module 131 analyzes and judges the received temperature and humidity data according to the preset operating strategy and algorithm, and adjusts the operating status of the compressor 111 and the first fan 123 accordingly. For example, when the temperature or humidity deviates from the set value, the control module 131 can adjust the cooling capacity of the compressor 111 or the fan speed of the first fan 123, thereby actively and dynamically controlling the cooling and dehumidification process of the cold storage. This achieves accurate perception and active adjustment of the environmental parameters inside the cold storage, ensuring the stability and uniformity of the cold storage environment, which is beneficial to improving the preservation effect and quality of stored goods.

[0070] In addition, such as Figure 4 As shown, the cold storage unit 10 also includes an oxygen sensor 134, which is located upstream of the dehumidifier 124 along the flow direction of the return air. The oxygen sensor 134 is used to detect the oxygen concentration of the return air and is electrically connected to the control module 131.

[0071] The oxygen sensor 134 is a device for detecting the oxygen concentration in a gas. The oxygen sensor 134 can be an electrochemical oxygen sensor, which determines the oxygen concentration by measuring the electrochemical reaction of oxygen in an electrolyte, and features fast response and high accuracy. Alternatively, an optical oxygen sensor based on the fluorescence quenching principle can be used, which measures the oxygen concentration by detecting the quenching effect of oxygen on a fluorescent substance, and has advantages such as non-contact operation and long lifespan.

[0072] By positioning an oxygen sensor upstream of the dehumidifier along the direction of return air flow, it is ensured that the sensor can accurately detect the oxygen concentration in the untreated return air. The detected oxygen concentration data is transmitted to the control module 131 as the basis for subsequent environmental control.

[0073] By adding an oxygen sensor 134 to the cold storage unit, the control module 131 can acquire real-time oxygen concentration information of the return air in the cold storage. Combined with the temperature and humidity data provided by the existing temperature sensor 132 and humidity sensor 133, the control module 131 can monitor the environmental parameters in the cold storage more comprehensively and precisely. This is particularly important for storage environments that require precise control of gas composition (such as certain fruits, vegetables, and live aquatic products), enabling timely detection and response to abnormal changes in oxygen concentration. This provides a data basis for subsequent oxygen concentration adjustment, effectively preventing spoilage, quality degradation, or death of live aquatic products due to oxygen deficiency caused by unsuitable oxygen concentration, further enhancing the cold storage unit's ability to regulate the storage environment and its preservation effect.

[0074] Continue to refer to Figure 4 The air cooler 12 includes a heating element 126, which is disposed at the dehumidifier 124 and is used to heat the dehumidifier 124. The heating element 126 is electrically connected to the control module 131.

[0075] The heating element 126 is a device that can convert electrical energy or other forms of energy into heat energy. Its main function is to increase the temperature of the dehumidifier 124, causing the moisture adsorbed inside the dehumidifier 124 to desorb, thereby regenerating the dehumidifier 124. The heating element 126 can be an electric heating tube, a PTC (Positive Temperature Coefficient) heater, or part of the bypass pipe of the condenser, etc.

[0076] By configuring the heating element 126 as an electrically heated structure and electrically connecting it to the control module 131, the operating status of the heating element 126 (such as start-up, stop, heating power, etc.) can be precisely controlled by the control module 131. The control module 131 can intelligently determine when to activate the heating element 126 for regeneration, as well as the duration and intensity of the regeneration, based on the return air humidity detected by the humidity sensor 133, the saturation level of the dehumidifier 124 (e.g., determined by operating time or the humidity difference before and after the dehumidifier 124), and a preset regeneration strategy.

[0077] Taking the dehumidifier 124, which is a porous metal-organic framework (MOF), as an example, this is a structure formed by the self-assembly of metal ions or metal clusters with organic ligands through coordination bonds. It possesses extremely high specific surface area, tunable pore size, and abundant pore structure. As a dehumidifier 124, MOF materials exhibit excellent adsorption selectivity and capacity for water molecules due to their unique pore structure and surface chemistry. Furthermore, MOF materials typically have lower regeneration temperatures and faster regeneration rates, meaning less energy is required for heating regeneration, resulting in shorter regeneration cycles, thereby improving dehumidification efficiency and reducing operating costs. Its porous structure ensures that water molecules can efficiently enter and exit the material's interior, accelerating the adsorption and desorption processes.

[0078] By introducing a heating element 126 and electrically connecting it to the control module 131, and employing a porous metal-organic framework as the dehumidifier 124, this application effectively solves the problem of decreased dehumidification capacity after the dehumidifier 124 becomes saturated. When the dehumidifier 124 absorbs a certain amount of moisture, the control module 131 can intelligently activate the heating element 126 to heat and regenerate the dehumidifier 124. The metal-organic framework material, due to its excellent adsorption-desorption properties and low regeneration energy consumption, makes the regeneration process more efficient and energy-saving. The precise control of the heating element 126 by the control module 131 ensures that the dehumidifier 124 can desorb moisture promptly and thoroughly, restoring its dehumidification capacity, thereby guaranteeing a continuous and stable dehumidification effect for the cold storage unit. This combination not only extends the service life of the dehumidifier 124 but also significantly improves the control accuracy of the cold storage environment humidity and the overall economic efficiency of operation.

[0079] To address the high humidity requirements of cold storage facilities, traditional humidification devices such as wet-film or ultrasonic humidifiers require manual, periodic replenishment of purified or distilled water. This cumbersome process poses a risk of contamination, increasing maintenance costs and wasting significant water resources. Regarding oxygen concentration control, some cold storage facilities directly introduce high-temperature external fresh air, leading to abnormally high internal temperatures. While other systems are equipped with independent ventilation and oxygenation devices, these are disconnected from the humidification system, resulting in complex structures, large footprints, and inflexible operation. The parallel operation of multiple functional modules can cause repeated fluctuations in temperature and humidity parameters, making it difficult to meet the stable environmental conditions required for the preservation of aquatic products. These problems manifest as insufficient humidity control precision, excessive energy consumption during humidification, and a lack of coordinated optimization between ventilation / oxygenation and humidity regulation, severely limiting the effectiveness of cold storage facilities in the storage of live aquatic products.

[0080] To solve the above problems, such as Figure 3 and Figure 5 As shown, the cold storage unit 10 includes a humidifier 14, which includes a water tank 141, a porous humidifier 142, and a second fan 143. The water tank 141 is provided with a second return air inlet 1411 and a second air outlet 1412. The porous humidifier 142 and the second fan 143 are disposed inside the water tank 141. The second fan 143 is used to drive air to flow sequentially through the porous humidifier 142 and the second air outlet 1412.

[0081] The humidifier 14 is a device used to replenish moisture to the cold storage environment to increase air humidity. Its core components include a water tank 141, a porous humidifier 142, and a second fan 143. The water tank 141 stores the water required for humidification and can be made of corrosion-resistant plastic or stainless steel. The water tank 141 has a second return air inlet 1411 and a second air outlet 1412. The second return air inlet 1411 directs the return air from the cold storage to the porous humidifier 142 inside the water tank 141 for humidification, while the second air outlet 1412 returns the humidified air back into the cold storage 100.

[0082] A porous humidifier is located inside the water tank 141. Its function is to provide a large humidified surface area so that air can fully absorb moisture as it flows through. This porous humidifier can be made of a wet film, a honeycomb structure, a multi-layer filter, or other materials with high water absorption and a large specific surface area. The porous structure helps reduce return air resistance and, through capillary action, distributes water from the bottom of the water tank 141 throughout the porous humidifier 142, improving the contact between the return air and moisture, thereby enhancing the humidification effect on the return air.

[0083] The second fan 143 is also located inside the water tank 141. Its function is to force air to flow through the porous humidifier 142, thereby accelerating the evaporation of water and the humidification process of the air, and ensuring humidification efficiency.

[0084] In this way, the humidifier 14 draws return air from the cold storage 100 into the water tank 141 via the second fan 143, allowing it to flow through the moistened porous humidifier 142, thus carrying more moisture into the air. The humidified air is then returned to the cold storage 100 through the second air outlet 1412. This design allows the cold storage unit 10 to flexibly adjust the humidity within the cold storage according to the actual needs of the stored items, avoiding excessive dryness caused by a single dehumidification function. Especially for agricultural products, flowers, and live aquatic products that require a high-humidity environment to maintain freshness, this humidification function can effectively extend their shelf life or survival time, maintain their quality, and significantly improve the adaptability of the cold storage unit to different storage needs and the preservation effect of the items.

[0085] In some embodiments, such as Figure 3 and Figure 5 As shown, the water tank 141 is also equipped with a fresh air inlet 1413, which is used to introduce fresh air into the water tank 141. The fresh air inlet 1413 and the second return air inlet 1411 are configured to be selectively opened.

[0086] By using the fresh air inlet 1413, fresh outside air can be introduced into the water tank 141 of the humidifier 14, thereby effectively improving the air quality inside the cold storage 100, such as by supplementing oxygen. To ensure that the humidifier 14 can flexibly select the air source according to actual needs during operation, the fresh air inlet 1413 and the second return air inlet 1411 are configured to be selectively open. That is, only one air source channel at the water tank 141 can be in the open state, while the other is in the closed state, thus preventing return air and fresh air from entering the water tank 141 at the same time.

[0087] Continue to refer to Figure 5 The evaporator 12 also includes a drip tray (not shown) and a drain pipe 127. The drip tray is located below the evaporator 121 and is used to collect condensate. The drain pipe 127 connects the drip tray and the water tank 141. The drip tray is typically made of corrosion-resistant material and can effectively collect the condensate generated by the evaporator 121 during the refrigeration process. The drain pipe 127 transports this condensate to the water tank 141 of the humidifier 14, realizing the recycling of water resources. Furthermore, the lower-temperature condensate can be used to cool the return air or fresh air flowing through the porous humidifier 142. This is especially beneficial for fresh air, preventing the direct inflow of high-temperature external fresh air into the cold storage 100 and avoiding large-scale local temperature fluctuations, without requiring an additional cooling source.

[0088] In this way, the cold storage unit 10 can flexibly select the humidification air source according to actual needs. It can either introduce fresh air through the fresh air inlet 1413 to improve the air quality in the storage room 20, or use the internal return air through the second return air inlet 1411 for humidification. The condensate generated by the air cooler 12 is collected by the drip tray and transported to the water tank 141 of the humidifier 14 through the drain pipe 127, realizing the effective recycling of condensate, significantly reducing water consumption and lowering operating costs. The selective opening configuration of the fresh air inlet 1413 and the second return air inlet 1411 ensures the efficient operation of the system when introducing fresh air or return air, avoiding unnecessary energy waste, thereby improving the energy efficiency and economy of the entire cold storage unit while ensuring the quality of the storage environment.

[0089] It should be noted that the drip tray inside the air cooler casing 125 can be a separate component. Alternatively, the drip tray structure can be enclosed inside the bottom side of the air cooler casing 125; there is no limitation on this.

[0090] like Figure 4 As shown, the humidifier 14 also includes a first air damper 144 and a second air damper 145. The first air damper 144 is located at the fresh air inlet 1413 and is used to control the opening or closing of the fresh air inlet 1413. The second air damper 145 is located at the second return air inlet 1411 and is used to control the opening or closing of the second return air inlet 1411.

[0091] The first damper 144 and the second damper 145 are mechanical devices used to control the opening or closing of airflow channels. Their main function is to precisely control the airflow in and out of the fresh air inlet 1413 and the second return air inlet 1411, thereby regulating the air source entering the humidifier 14.

[0092] For example, the first damper 144 and the second damper 145 can be electric dampers, where the opening of the channel is changed by driving the blades to rotate or translate via a motor; they can also be pneumatic dampers, where the actuator is driven by air pressure. In this case, the opening of the damper can be controlled by electrically driving the pneumatic valve. Figure 4 As shown, the first damper 144 and the second damper 145 can be electrically connected to the control module 131 to realize the automatic control and adjustment of the first damper 144 and the second damper 145.

[0093] By installing a first damper 144 at the fresh air inlet 1413 and a second damper 145 at the second return air inlet 1411 of the humidifier 14, this application enables precise control of the air intake source of the humidifier 14. When fresh air needs to be introduced to adjust the oxygen concentration in the cold storage, the first damper 144 can be opened while the second damper 145 is closed to ensure that only fresh air enters the humidifier 14. Conversely, when the return air inside the cold storage needs to be used for humidification, the second damper 145 can be opened while the first damper 144 is closed to prevent the introduction of fresh air. The coordinated operation of the first damper 144 and the second damper 145 allows the humidifier 14 to flexibly and efficiently select and adjust the air intake source according to the actual operating needs of the cold storage, thereby more accurately maintaining the environmental parameters inside the cold storage and ensuring the quality of the stored goods.

[0094] In some embodiments, such as Figure 3 As shown, the humidifier 14 also includes a return air duct 146, one end of which is connected to the second return air inlet 1411, and the other end of which is located at the dehumidifier 124.

[0095] Return air duct 146 is a channel used to guide airflow. Its material can be selected according to actual needs, such as galvanized steel sheet, aluminum sheet, or flexible insulated air duct, to ensure the airtightness and efficiency of air transmission. The cross-sectional shape of return air duct 146 can be designed as circular, rectangular, or elliptical to adapt to different installation spaces and airflow resistance requirements.

[0096] One end of the return air duct 146 is connected to the second return air inlet 1411 of the humidifier 14. This connection method typically employs a flange connection, plug-in connection, or flexible connection, ensuring airtightness at the connection point so that the humidifier 14 can stably draw air from a specific path. The other end of the return air duct 146 is located at the dehumidifier 124, meaning that this end is positioned near the dehumidifier 124, for example, it can be located on the left, right, upper, lower, or air inlet side of the dehumidifier 124.

[0097] In this way, a return air structure can be set up in the cold storage 100 near the dehumidifier 124. When the air cooler 12 and the humidifier 14 are running at the same time, part of the return air is drawn into the water tank 141 through the return air pipe 146 for humidification, and the other part of the return air is dehumidified by the dehumidifier 124 and then introduced into the evaporator 121 for cooling.

[0098] The return air structure can be a return air duct set inside the cold storage 100, with multiple spaced return air holes at the top, so as to improve the uniformity of the return air inside the cold storage 100 by guiding the return air duct.

[0099] Furthermore, when the humidifier 14 is running and the air cooler 12 is stopped, the heating element 126 can be activated via the control module 131 to heat the dehumidifier 124. During the heating process of the dehumidifier 124, the separated water vapor is drawn into the water tank 141 through the return air duct 146 and the second return air inlet 1411 by the second fan 143 for humidification, and the humidified return air is blown into the cold storage 100 through the second air outlet 1412. This dual humidification structure improves the humidification speed and effect. While solving the problem of heating and regenerating the dehumidifier 124, it also avoids the problem of water vapor generated during the regeneration process of the dehumidifier 124 flowing through the evaporator 121 and causing frost.

[0100] Secondly, embodiments of this application provide a cold storage facility, such as... Figure 1 As shown, the cold storage 100 includes a storage room 20 and a cold storage unit 10 as described in the first aspect. A cooler 12 is installed inside the storage room 20, and a condenser 11 is installed outside the storage room 20. The cooler 12 and the condenser 11 are connected by a refrigerant pipeline for refrigerant circulation.

[0101] Since the cold storage 100 adopts the cold storage unit 10 in the first aspect, it has at least all the beneficial effects brought about by the technical solution of the embodiment shown in the first aspect, which will not be repeated here.

[0102] For example, such as Figure 1 and Figure 3 As shown, the condenser 11 also includes a first grille 114. The storage chamber 20 has an openable door on its front side, and its rear bottom is recessed inward to form a receiving space, within which the condenser 11 is housed. The opening of this receiving space is equipped with a first grille to prevent larger foreign objects from entering the receiving space and the condenser 112 under the influence of airflow, thereby maintaining smooth outdoor air circulation and keeping the condenser 112 clean.

[0103] In addition, the air intake pipe where the fresh air inlet 1413 of the water tank 141 is located runs through the side wall of the storage room 20, and a second grille 147 is installed on the outside to prevent foreign objects in the external environment from entering the water tank 141 through the fresh air inlet 1413 and blocking the porous humidifier 142.

[0104] Thirdly, embodiments of this application provide a control method for a cold storage unit, used to control the cold storage unit 10 in the first aspect, such as... Figure 6 and Figure 7 As shown, the control method includes the following steps: Obtain the set temperature T0 and cooling rate parameter A of the cold storage unit 10.

[0105] Control the start of the condenser 11 and the air cooler 12.

[0106] Control the operating power of compressor 111 and first fan 123 until the return air reaches the set temperature according to the cooling rate parameter.

[0107] Adjust the operating power of the compressor 111 and the first fan 123 to keep the return air within the set temperature T0 range.

[0108] The set temperature is the target temperature value preset by the user or system for the cold storage environment. For example, for specific agricultural products, pharmaceuticals, or live aquatic products, it may be necessary to maintain a precise low temperature. The cooling rate parameter refers to the expected rate of temperature change as the air temperature inside the storage compartment 20 decreases from its current value to the set temperature, such as how many degrees Celsius it decreases per hour.

[0109] For live aquatic products, a rapid cooling due to a large rate of temperature change will reduce the survival rate, while a small rate of temperature change will keep the live aquatic products in a high metabolic state for a long time, which will greatly consume the nutrients in the body and thus reduce the quality.

[0110] The set temperature T0 and cooling rate parameter A are typically received by the control module 131. Users can input the appropriate set temperature T0 and cooling rate parameter A into the control module 131 via the human-machine interface of the cold storage unit 10, such as a touchscreen, physical buttons, remote control, or remote application. The control module 131 internally stores corresponding programs for parsing and storing these input parameters as the basis for subsequent control logic.

[0111] The condenser 11 and the air cooler 12 are started, so that the air cooler 12 drives the air to flow through the evaporator 121, and the refrigerant flowing in the evaporator 121 evaporates and absorbs heat from the nearby return air, thereby achieving cooling and temperature reduction in the storage chamber 20.

[0112] During this process, the control module 131 continuously monitors the return air temperature collected in real time by the temperature sensor 132. Based on the current return air temperature, the set cooling rate parameter A, and the set temperature T0, the control module 131 dynamically adjusts the operating power of the compressor 111 and the speed of the first fan 123 to keep the cooling rate of the return air within the range of the cooling rate parameter A until the set temperature T0 is reached.

[0113] For example, if the actual cooling rate is lower than the preset value, the control module 131 will appropriately increase the operating power of the compressor 111 and the speed of the first fan 123 to enhance the cooling effect and air circulation speed. Conversely, if the actual cooling rate is too fast, the control module 131 will appropriately reduce the operating power of the compressor 111 and the speed of the first fan 123 to weaken the cooling effect and air circulation speed. This dynamic adjustment process continues until the return air temperature steadily reaches the set temperature T0 according to the set cooling rate parameter A.

[0114] Finally, the air cooler 12 and condenser 11 can be in standby or low-power operation mode. In this mode, the control module 131 continuously receives return air temperature data from the temperature sensor 132. When the return air temperature is detected to be higher or lower than the allowable range of the set temperature T0, the control module 131 immediately fine-tunes the operating power of the compressor 111 and the first fan 123. For example, when the temperature is slightly higher than the set temperature, the control module 131 will moderately increase the operating power of the compressor 111 and the first fan 123 to enhance the cooling effect. When the temperature is slightly lower than the set temperature, it will moderately reduce the operating power, or even stop or put them into standby mode if necessary, to reduce the cooling capacity. This ensures that the return air temperature is accurately and stably maintained within the set target temperature T0 range, minimizing temperature fluctuations.

[0115] Through this technical solution, this application enables precise temperature control of the environment within the storage compartment 20. It ensures that the return air temperature decreases smoothly at a preset rate, avoiding the problems of sudden temperature drops or slow cooling that may occur with traditional control methods, thus better protecting the quality of stored goods. Once the set temperature is reached, the system continuously adjusts its operating power, effectively maintaining the return air temperature within a narrow set range, significantly improving the stability and accuracy of temperature control, and providing a more ideal storage environment for the goods in the cold storage.

[0116] Furthermore, since the control method of this cold storage unit is used to control the cold storage unit 10 in the first aspect, it has at least all the beneficial effects brought about by the technical solution of the embodiment shown in the first aspect, which will not be repeated here.

[0117] It should be noted that before obtaining the set temperature T0 and cooling rate parameter A, the cold storage unit 10 needs to be started, such as by connecting the power supply or switching from standby mode to start mode. After the cold storage unit 10 is started, the control module 131 can detect and determine whether the door of the storage room 20 is closed (i.e., determine whether the cold storage 100 is closed) based on the sensor at the door of the storage room 20.

[0118] If the door is closed, the cold storage unit 10 can perform subsequent operations on its own, such as obtaining the set temperature T0 and cooling rate parameter A, or obtaining the set humidity W0 and first return air humidity W1 of the cold storage unit 10, or obtaining parameters such as the set oxygen concentration V0 and the first oxygen concentration V1 of the return air of the cold storage unit 10.

[0119] If the door is open, its current status can be repeatedly checked after a period of time. Alternatively, the cold storage unit 10 can be turned off and then turned on again after a period of time to re-check the door's current status. This avoids the outside air entering through a continuously open door affecting the accuracy of the above parameters.

[0120] In some embodiments, such as Figure 6 As shown, the control method further includes the following steps: Obtain the set humidity W0 and the first return air humidity W1 of the cold storage unit 10.

[0121] Determine whether the humidity of the first return air W1 is less than the set humidity W0 (i.e., whether W1 < W0 is true).

[0122] If the first return air humidity W1 is less than the set humidity W0 (i.e., W1 < W0), check whether the compressor 111 and the first fan 123 are started.

[0123] If the compressor 111 and the first fan 123 start, control the second return air vent 1411 to open and start the second fan 143.

[0124] If the compressor 111 and the first fan 123 are not started, control the second return air vent 1411 to open, start the second fan 143 and control the heating element 126 to start.

[0125] After the first preset time t1, the second return air humidity W2 is obtained.

[0126] Determine whether the humidity of the second return air, W2, is less than the set humidity, W0 (i.e., whether W2 < W0 is true).

[0127] If the second return air humidity W2 is less than the set humidity W0 (i.e., W2 < W0), maintain the current operating state and repeatedly collect the second return air temperature W2 after the first preset time t1.

[0128] If the second return air humidity W2 is greater than or equal to the set humidity W0 (i.e., W2≥W0), control to close the second return air vent 1411 and the second fan 143.

[0129] The set humidity W0 is a target humidity value preset based on the characteristics and preservation requirements of the items stored in the storage room 20, and is usually input or selected by the user through the control module 131. The first return air humidity W1 refers to the humidity value of the return air before it flows through the dehumidifier 124, which is detected in real time by the humidity sensor 133, that is, the original return air humidity data entering the air cooler 125.

[0130] After receiving the set humidity W0 and the real-time detected first return air humidity W1, the control module 131 will compare and judge. The purpose of this step is to determine whether the current humidity in the storage room 20 is lower than the preset ideal humidity range, thereby deciding whether to start the humidification function.

[0131] If the initial return air humidity W1 is greater than or equal to the set humidity W0 (i.e., W1 ≥ W0), no humidification is required. Simply re-detect the initial return air humidity W1 after a period of time and re-compare and determine the result.

[0132] If the initial return air humidity W1 is less than the set humidity W0 (i.e., W1 < W0), it indicates that the ambient humidity in storage room 20 is too low and humidification is needed. At this time, the system will further monitor the operating status of compressor 111 and the first fan 123. This monitoring is to optimize the humidification strategy, as the operating status of compressor 111 and the first fan 123 affects the air circulation temperature and humidity within the cold storage, thus impacting the humidification effect and energy consumption.

[0133] If the compressor 111 and the first fan 123 are running, it indicates that the cold storage is cooling or maintaining the temperature. At this time, the control module 131 will control the second return air vent 1411 of the humidifier 14 to open and start the second fan 143 inside the humidifier 14 to absorb and humidify the return air through the return air structure at the desiccant 124. That is, the second fan 143 will drive the return air in the storage compartment 20 to flow through the porous humidifier 142 in the water tank 141, thereby humidifying the air.

[0134] If the compressor 111 and the first fan 123 are not started, while the second return air vent 1411 is opened and the second fan 143 is started, the control module 131 will also instruct the heating element 126 to start, so as to heat the dehumidifier 124 near the second return air vent 1411. The heated dehumidifier 124 will separate the adsorbed moisture, so that the return air can be humidified simultaneously by the heated dehumidifier 124 and the porous humidifier 142, further improving the humidification effect and humidification rate. During this process, since the air cooler 12 is not started, the water vapor separated at the first return air vent 1251 will not flow through the evaporator 121 to condense and frost.

[0135] After humidification is initiated (opening the second return air vent 1411, starting the second fan 143, and possibly activating the heating element 126), the system will not stop immediately but will wait for a preset time period, namely the first preset time t1. This time period is to allow sufficient time for the humidification process to affect the humidity of the cold storage environment. After the first preset time t1 ends, the control module 131 will again obtain the humidity value of the return air through the humidity sensor 133. The humidity value obtained at this time is called the second return air humidity W2.

[0136] The control module 131 compares the newly acquired second return air humidity W2 with the set humidity W0 to assess whether the current humidification effect has reached the expected target. If, after a first preset time t1, the humidity of the return air (i.e., the second return air humidity W2) is still lower than the set humidity W0, it indicates that the humidification effect has not yet met the requirements. At this time, the system will continue to maintain the current humidification operation state (i.e., the second return air vent 1411 is open, the second fan 143 is running, and the heating element 126 may be activated), and collect humidity data again after another first preset time t1 for continuous monitoring and adjustment.

[0137] If the second return air humidity W2 is greater than or equal to the set humidity W0 (i.e., W2 ≥ W0), meaning the second return air humidity W2 has reached or exceeded the set humidity W0, it indicates that the humidification target has been achieved. At this time, the control module 131 will instruct the second return air vent 1411 and the second fan 143 of the humidifier 14 to close (and shut down any heating element 126 that may be activated), stopping humidification to avoid over-humidification and save energy.

[0138] The above technical solution enables real-time monitoring of the ambient humidity within the storage room 20. Based on the set humidity W0, it automatically activates the humidification function when the humidity is too low. During this process, the system intelligently determines whether to activate the heating element 126 to assist in humidification based on the operating status of the condenser 11 and the air cooler 12, thereby optimizing the humidification strategy and improving humidification efficiency. This is particularly effective and rapid when the cold storage is not in a cooling state, while simultaneously addressing the heating and regeneration issues of the dehumidifier 124. This ensures that the ambient humidity in the cold storage is precisely maintained within the set range, avoiding over-humidification or under-humidification, thus effectively guaranteeing the quality of the stored goods.

[0139] Continue to refer to Figure 6 After controlling the opening of the second return air vent 1411, starting the second fan 143, and starting the heating element 126, the control method includes the following steps: After the second preset time t2, the cumulative time t0 for the heating element 126 to start is obtained.

[0140] Determine whether the cumulative time t0 is greater than or equal to the first threshold A1 (i.e., whether t0≥A1 holds true).

[0141] If the cumulative time t0 is greater than or equal to the first threshold A1 (i.e., t0≥A1), control the heating element 126 to be turned off and the cumulative time t0 to be cleared.

[0142] If the cumulative time t0 is less than the first threshold A1 (i.e., t0 < A1), the current operating state is maintained, and the cumulative time t0 of the start of the heating element 126 is repeatedly collected after the second preset time t2.

[0143] The second preset time t2 and the first preset time t1 are preset time intervals, and the values ​​of the second preset time t2 and the first preset time t1 can be set to a range of 10-600s.

[0144] The cumulative time t0 for the heating element 126 to start refers to the total actual operating time of the heating element 126 since the last reset. This time is accurately recorded by the control module 131 through an internal timer or counting method. The first threshold A1 is the upper limit of the maximum continuous operating time set for the heating element 126. Its value can be set according to factors such as the power of the heating element 126, the heat resistance of the dehumidifier 124, and the desired energy consumption level, so that the dehumidifier 124 can be fully heated and restored to a lower moisture content state within the first threshold A1 time, thereby improving the dehumidification effect of the dehumidifier 124 on the return air.

[0145] When the cumulative time t0 is greater than or equal to the first threshold A1, the control module 131 sends a shutdown command to the heating element 126 to cut off its power supply, thereby stopping heating and avoiding wasting energy by heating the dehumidifier 124. At this time, in order to prepare for the next start-up cycle of the heating element 126, the cumulative time t0 is reset to zero, ensuring that the running time of the heating element 126 can be managed independently and accurately each time.

[0146] If the cumulative time t0 has not yet reached the first threshold A1, the system will continue to wait for the next second preset time interval t2, and then obtain and judge the cumulative running time t0 of the heating element 126 again to achieve continuous monitoring.

[0147] In this way, the cold storage unit can intelligently manage the operating time of the heating element 126. This control strategy effectively avoids energy waste and potential overheating risks caused by the heating element 126 operating continuously for extended periods, thereby improving the operating efficiency and safety of the cold storage unit. Simultaneously, through the above scheme, the dehumidifier 124 can be fully heated and restored to a lower moisture content state within the first threshold A1 time period, thereby improving the dehumidification effect of the dehumidifier 124 on the return air.

[0148] In some embodiments, such as Figure 7 As shown, the control method further includes the following steps: Obtain the set oxygen concentration V0 and the first oxygen concentration V1 of the return air of the cold storage unit 10.

[0149] Determine whether the first oxygen concentration V1 is less than the set oxygen concentration V0 (i.e., whether V1 < V0 is true).

[0150] If the first oxygen concentration V1 is less than the set oxygen concentration V0 (i.e., V1 < V0), the fresh air inlet 1413 is opened and the second fan 143 is started.

[0151] After the third preset time t3, the second oxygen concentration V2 of the return air is obtained.

[0152] Determine whether the second oxygen concentration V2 is less than the set oxygen concentration V0 (i.e., whether V2 < V0 is true).

[0153] If the second oxygen concentration V2 is less than the set oxygen concentration V0 (i.e., V2 < V0), maintain the current operating state and repeatedly collect the second oxygen concentration V2 after the third preset time t3.

[0154] If the second oxygen concentration V2 is greater than or equal to the set oxygen concentration V0 (i.e., V2≥V0), the second fan 143 and the fresh air inlet 1413 are shut down.

[0155] The oxygen concentration V0 is a pre-set target oxygen concentration value based on the characteristics of the stored items. For example, some fruits and vegetables may need to be maintained in a low but not zero oxygen concentration range to inhibit respiration while avoiding anaerobic conditions. For live aquatic products, different products and different temperature storage ranges require different applicable oxygen concentrations.

[0156] The oxygen concentration V0 can be preset or input by the user and stored in the memory of the control module 131, and can be input and modified through the human-machine interface. The first oxygen concentration V1 of the return air is the actual oxygen concentration of the return air in the storage chamber 20, which is detected in real time by the oxygen sensor 134. After receiving the set oxygen concentration V0 and the real-time detected first oxygen concentration V1, the control module 131 performs a comparison calculation to determine whether the first oxygen concentration V1 is less than the set oxygen concentration V0. This step determines whether the oxygen concentration in the storage chamber 20 is lower than the target value, thereby deciding whether oxygen replenishment is necessary.

[0157] If the determination result is that the first oxygen concentration V1 is less than the set oxygen concentration V0, the control module 131 will issue a command to open the fresh air inlet 1413 and start the second fan 143. The fresh air inlet 1413 is usually controlled by the first damper 144, which allows fresh air from outside to enter. The function of the second fan 143 is to introduce fresh air from outside (containing a higher oxygen concentration) into the water tank 141 of the humidifier 14 through the fresh air inlet 1413, so that it is humidified and cooled by the porous humidifier 142, and then blown into the storage chamber 20 by the second fan 143, thereby increasing the oxygen concentration in the storage chamber 20.

[0158] The opening of the fresh air inlet 1413 and the start-up of the second fan 143 can be controlled by the control module 131 via electrical components such as relays or solid-state relays. After initiating the fresh air introduction operation, the system will wait for a preset time period, namely the third preset time t3, for example, 10-600 seconds, to ensure that sufficient fresh air enters and mixes evenly with the air in the storage chamber 20. Afterward, the oxygen sensor 134 will again collect the oxygen concentration of the return air as the second oxygen concentration V2 for subsequent judgment.

[0159] Next, the system again determines whether the second oxygen concentration V2 is less than the set oxygen concentration V0 to evaluate the effect of fresh air introduction. If the oxygen concentration is still lower than the set value after one fresh air introduction, that is, the second oxygen concentration V2 is less than the set oxygen concentration V0, the system will maintain the current operating state, that is, the fresh air inlet 1413 will remain open and the second fan 143 will continue to run, and the oxygen concentration will be collected again after another third preset time t3 for continuous monitoring and adjustment.

[0160] Conversely, if the judgment result shows that the second oxygen concentration V2 is greater than or equal to the set oxygen concentration V0, it indicates that the oxygen supply is sufficient. At this time, the control module 131 will issue a command to shut down the second fan 143 and the fresh air inlet 1413 to avoid excessive ventilation leading to an excessively high oxygen concentration V0 or unnecessary energy consumption.

[0161] Through oxygen concentration control, the cold storage unit 10 can monitor the oxygen concentration in the storage chamber 20 in real time and intelligently adjust it according to the preset target value. When the oxygen concentration is detected to be lower than the set value, the system will automatically open the fresh air inlet 1413 and start the second fan 143 to introduce fresh air from outside to supplement oxygen, thereby effectively avoiding the problem of anaerobic respiration, quality decline, or oxygen deficiency death of aquatic products caused by excessively low oxygen concentration in the cold storage. Through periodic monitoring and judgment, this method can ensure that the oxygen concentration in the cold storage is maintained within a suitable range, providing a stable gas environment for the stored products, significantly extending their shelf life and maintaining their original quality. In addition, when the oxygen concentration reaches the set value, the system can promptly close the fresh air inlet 1413 and the second fan 143, avoiding unnecessary energy consumption and achieving precise and energy-saving oxygen environment control.

[0162] Fourthly, such as Figure 8 As shown in the figure, this application embodiment provides a control device for a cold storage unit 10, namely a control module 131. The control module includes a processor 1311, a communication interface 1312, a memory 1313, and a communication bus 1314. The processor 1311, the communication interface 1312, and the memory 1313 communicate with each other via the communication bus 1314. The memory 1313 is used to store computer programs.

[0163] In one embodiment of this application, when the processor 1311 executes the computer program stored in the memory 1313, it implements the execution steps of the control method for the cold storage unit in the third aspect.

[0164] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the execution steps of the control method for the cold storage unit in the third aspect.

[0165] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0166] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0167] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cold storage unit, characterized in that, include: A condensing machine, the condensing machine including a condenser and a compressor; And a cold air blower, the cold air blower including an evaporator, a throttle valve and a first fan, the compressor, the condenser, the throttle valve and the evaporator are connected in sequence to form a refrigerant circuit, and the first fan is used to drive return air to flow through the evaporator; Along the direction of return air flow, the air cooler has a desiccant installed upstream of the evaporator to absorb moisture from the return air.

2. The cold storage unit according to claim 1, characterized in that, The cold storage unit includes: Temperature sensor; A humidity sensor and a temperature sensor are positioned upstream of the dehumidifier along the direction of return air flow. The temperature sensor, humidity sensor, compressor, and first fan are electrically connected to the control module.

3. The cold storage unit according to claim 2, characterized in that, The air cooler includes a heating element, which is disposed at the dehumidifier and used to heat the dehumidifier; The heating element is electrically connected to the control module, and the dehumidifier uses a porous, renewable adsorption material, which reduces the adsorbed water content by heating.

4. The cold storage unit according to claim 1, characterized in that, The air cooler includes an air cooler housing, which has a first return air inlet and a first air outlet. The evaporator, the throttling device, and the first fan are disposed inside the air cooler housing. The desiccant is disposed at the first return air inlet. The first fan is used to drive the return air to flow sequentially through the desiccant, the evaporator, and the first air outlet.

5. The cold storage unit according to claim 2, characterized in that, The cold storage unit includes: An oxygen sensor is provided, positioned upstream of the dehumidifier along the direction of return air flow. The oxygen sensor is used to detect the oxygen concentration of the return air and is electrically connected to the control module.

6. The cold storage unit according to any one of claims 1-5, characterized in that, The cold storage unit includes a humidifier, and the humidifier includes: The water tank is equipped with a second return air inlet and a second air outlet; A porous humidifier is installed inside the water tank; And a second fan, located inside the water tank, is used to drive air to flow sequentially through the porous humidifier and the second air outlet.

7. The cold storage unit according to claim 6, characterized in that, The water tank is also equipped with a fresh air inlet for introducing fresh air into the water tank; wherein the fresh air inlet and the second return air inlet are configured to be selectively opened; and / or, The air cooler also includes a water collection tray and a drain pipe. The water collection tray is located below the evaporator and is used to collect condensate. The drain pipe connects the water collection tray and the water tank.

8. The cold storage unit according to claim 7, characterized in that, The humidifier also includes: The first air damper is located at the fresh air inlet and is used to control the opening or closing of the fresh air inlet; And a second air damper, which is located at the second return air inlet and is used to control the opening or closing of the second return air inlet.

9. The cold storage unit according to claim 6, characterized in that, The humidifier also includes a return air duct, one end of which is connected to the second return air inlet, and the other end of which is located at the dehumidifier.

10. A cold storage facility, characterized in that, The system includes a storage room and a cold storage unit as described in any one of claims 1-9, wherein the air cooler is located inside the storage room, the condenser is located outside the storage room, and the air cooler and the condenser are connected by a refrigerant pipeline for the circulation of refrigerant.

11. A control method for a cold storage unit, used to control the cold storage unit as described in any one of claims 1-9, characterized in that, The control method includes: Obtain the set temperature and cooling rate parameters of the cold storage unit; Control the start-up of the condenser and the air cooler; Control the operating power of the compressor and the first fan until the return air reaches the set temperature according to the cooling rate parameter; Adjust the operating power of the compressor and the first fan to keep the return air within the set temperature range.

12. The control method for a cold storage unit according to claim 11, characterized in that, The control method includes: Obtain the set humidity and the first return air humidity of the cold storage unit; Determine whether the humidity of the first return air is less than the set humidity; If the humidity of the first return air is less than the set humidity, check whether the compressor and the first fan are started; If the compressor and the first fan are started, control the second return air vent to open and start the second fan; If the compressor and the first fan are not started, control the second return air vent to open, start the second fan, and control the heating element to start. After the first preset time, obtain the second return air humidity; Determine whether the humidity of the second return air is less than the set humidity; If the humidity of the second return air is less than the set humidity, maintain the current operating state and repeatedly collect the temperature of the second return air after a first preset time; If the humidity of the second return air is greater than or equal to the set humidity, the second return air inlet and the second fan are shut off.

13. The control method for a cold storage unit according to claim 12, characterized in that, After controlling the opening of the second return air vent, starting the second fan, and controlling the start of the heating element, the control method includes: After the second preset time, the cumulative time of the heating element's activation is obtained; Determine whether the accumulated time is greater than or equal to the first threshold; If the cumulative time is greater than or equal to the first threshold, control the heating element to be turned off and the cumulative time to be reset to zero; If the cumulative time is less than the first threshold, the cumulative time for the heating element to start is obtained again after a second preset time.

14. The control method for a cold storage unit according to claim 11, characterized in that, The control method includes: Obtain the set oxygen concentration of the cold storage unit and the first oxygen concentration of the return air; Determine whether the first oxygen concentration is less than the set oxygen concentration; If the first oxygen concentration is less than the set oxygen concentration, control the fresh air inlet to open and start the second fan; After the third preset time, the second oxygen concentration of the return air is obtained; Determine whether the second oxygen concentration is less than the set oxygen concentration; If the second oxygen concentration is less than the set oxygen concentration, maintain the current operating state and repeatedly collect the second oxygen concentration after a third preset time; If the second oxygen concentration is greater than or equal to the set oxygen concentration, the second fan and the fresh air inlet are shut down.

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