A method, system, device and medium for airflow distribution and defrosting control of a cold storage

Abstract

The application discloses a cold storage airflow distribution and defrosting control method, system and device and a storage medium. The method comprises the following steps: acquiring frost layer information detected by a frost layer sensor unit in real time and area temperature difference information detected by a temperature and humidity sensor unit in real time; controlling a wind supplementing unit and a wind guiding unit according to the area temperature difference information, so that an area temperature difference value indicated by the area temperature difference information is within a preset temperature difference range; and controlling a defrosting unit to defrost an evaporator according to the frost layer information. The area temperature difference information of the cold storage is detected in real time, so that the wind supplementing unit and the wind guiding unit can be quickly controlled according to the size of the temperature difference value to form directional convection and balance the temperature difference value, the temperature uniformity in the cold storage is ensured, and the area temperature difference is reduced. The defrosting unit is controlled to defrost the evaporator according to the frost layer information detected in real time, air consumption without frost is avoided, and the defrosting energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of refrigeration control technology, and in particular to a method, system, device and medium for airflow distribution and defrosting control in cold storage. Background Technology

[0002] Existing cold storage refrigeration systems typically have refrigeration components arranged on one side, and use a timed defrost controller to start heating defrosting within a preset time to remove frost from the evaporator surface.

[0003] Because the refrigeration components are arranged on one side, cold storage is prone to large temperature differences between areas, which can affect the storage of goods. In addition, the timed defrosting function may operate when the evaporator is not frosted, resulting in frost-free waste and high energy consumption. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a method, system, device and medium for airflow distribution and defrosting control in cold storage, which can reduce the regional temperature difference and defrosting energy consumption in cold storage.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling airflow distribution and defrosting in a cold storage system, applied to a control module of a cold storage system. The cold storage system further includes a refrigeration module, an airflow distribution module, and a defrosting module. The control module is connected to the refrigeration module, the airflow distribution module, and the defrosting module respectively. The refrigeration module includes a main air cooler installed inside the cold storage, and an evaporator is installed inside the main air cooler. The airflow distribution module includes a temperature and humidity sensor unit, a makeup air unit, and an air guide unit. The makeup air unit is disposed opposite to the main air cooler, and the air guide unit is located at the air outlet of the main air cooler. The defrosting module includes a frost layer sensor unit and a defrosting unit. The method includes:

[0006] The frost layer information detected in real time by the frost layer sensor unit and the regional temperature difference information detected in real time by the temperature and humidity sensor unit are obtained.

[0007] The air supply unit and the air guide unit are controlled according to the regional temperature difference information so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range.

[0008] The defrosting unit is controlled to defrost the evaporator based on the frost layer information.

[0009] In some optional embodiments, controlling the air supply unit and the air guide unit according to the regional temperature difference information to ensure that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range includes:

[0010] When the temperature difference information of the region indicates that the first temperature difference value of the first region is not within the preset temperature difference range, the first working time and first working mode of the air supply unit, the second working time and second working mode of the air guide unit are determined according to the first temperature difference value and the location information of the first region. The first working mode indicates that air is supplied to the first region with a first power, and the second working mode indicates that the main air cooler is adjusted to send air in a first direction with a second power. The first power is determined according to the first temperature difference value, and the second power and the first direction are determined according to the location information of the first region and the first temperature difference value.

[0011] The air supply unit is controlled to supply air in the first working mode during the first working time, and the air guide unit is controlled to guide air in the second working mode during the second working time, so that the first temperature difference value is within a preset temperature difference range.

[0012] In some optional embodiments, controlling the defrosting unit to defrost the evaporator based on the frost layer information includes:

[0013] When the frost layer information indicates that the surface frost layer thickness of the evaporator is greater than or equal to a first preset thickness threshold and the surface temperature of the evaporator is less than or equal to a first defrosting temperature threshold, the third working time and the third working mode of the defrosting unit are determined according to the surface frost layer thickness and the surface temperature. The third working mode indicates that the defrosting unit defrosts the evaporator with a third power.

[0014] The defrosting unit is controlled to defrost the evaporator in the third working mode during the third working time.

[0015] In some optional embodiments, during the process of controlling the defrosting unit to defrost the evaporator in the third operating mode during the third operating time, the method further includes:

[0016] When the thickness of the surface frost layer is less than or equal to a second preset thickness threshold and the surface temperature is greater than or equal to a second defrost temperature threshold, the working information of the defrost unit is obtained;

[0017] When the working information indicates that the defrosting unit is in working condition, the defrosting unit is turned off and the main air cooler is started.

[0018] When the working information indicates that the defrosting unit is not in working condition, the power of the main air cooler is adjusted so that the similarity between the frost thickness change curve of the evaporator within a preset time and the preset change curve is greater than the similarity threshold.

[0019] In some optional embodiments, the frost sensor unit includes a frost thickness sensor and an infrared temperature sensor, wherein the frost thickness sensor is disposed on the evaporator, and the infrared temperature sensor is disposed opposite to the frost thickness sensor; acquiring the frost information detected in real time by the frost sensor unit includes:

[0020] Acquire the first detection signal from the frost thickness sensor, and generate the surface frost thickness information of the evaporator based on the first detection signal;

[0021] Acquire the second detection signal from the infrared temperature sensor, and generate the surface temperature information of the evaporator based on the second detection signal;

[0022] The surface frost thickness information and the surface temperature information are configured as the frost information.

[0023] In some optional embodiments, the make-up air unit includes multiple auxiliary airflow devices evenly arranged along the length of the cold storage, each auxiliary airflow device including an air intake mechanism and an air outlet regulating mechanism. Determining the first operating time and first operating mode of the make-up air unit based on the first temperature difference value and the location information of the first area includes:

[0024] The target rotation speed and the first working time of the induced draft mechanism are determined based on the first temperature difference value and the preset temperature difference balance air volume meter. The preset temperature difference balance air volume meter indicates the adjustable air volume corresponding to different temperature difference values. The target rotation speed is positively correlated with the first power.

[0025] The target adjustment angle of the air outlet adjustment mechanism is determined based on the location information of the first area.

[0026] The first working mode is configured to control the air-guiding mechanism to rotate at the target speed during the first working time, and at the same time control the air outlet adjustment mechanism to adjust the air outlet direction of the air-guiding mechanism at the target adjustment angle, so that the air-guiding mechanism can supplement air to the first area.

[0027] In some optional embodiments, the refrigeration module further includes a compressor, a condenser, and a throttling valve. The compressor, the condenser, and the throttling valve are connected in series with the evaporator via refrigeration piping to form a closed refrigeration cycle. The defrosting unit includes a defrosting piping with its two ends connected to the compressor and the evaporator, respectively, and an electromagnetic control valve is installed on the defrosting piping. Determining the third operating time and the third operating mode of the defrosting unit based on the surface frost thickness and the surface temperature includes:

[0028] The target opening degree and the third working time of the electromagnetic control valve are determined based on the thickness of the surface frost layer and the surface temperature.

[0029] The third operating mode is configured to control the electromagnetic control valve to open at the target opening degree during the third operating time, so that the compressor delivers defrosting gas through the defrosting pipeline to the evaporator, wherein the defrosting gas is a high-temperature and high-pressure refrigerant gas.

[0030] Secondly, embodiments of the present invention provide a cold storage airflow distribution and defrosting control system for implementing the above-mentioned method, including:

[0031] The first module is used to acquire frost information detected in real time by the frost sensor unit and regional temperature difference information detected in real time by the temperature and humidity sensor unit.

[0032] The second module is used to control the air supply unit and the air guide unit according to the regional temperature difference information, so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range.

[0033] The third module is used to control the defrosting unit to defrost the evaporator based on the frost layer information.

[0034] Thirdly, embodiments of the present invention provide a cold storage airflow distribution and defrosting control device, comprising:

[0035] At least one processor;

[0036] At least one memory for storing at least one program;

[0037] When the at least one program is executed by the at least one processor, the at least one processor performs the method as described above.

[0038] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a processor-executable program, which, when executed by a processor, is used to perform the method described above.

[0039] Implementing the embodiments of the present invention has the following beneficial effects: The embodiments of the present invention provide a method for airflow distribution and defrosting control in cold storage, including: acquiring frost layer information detected in real time by the frost layer sensor unit, and regional temperature difference information detected in real time by the temperature and humidity sensor unit; controlling the make-up air unit and the guide air unit according to the regional temperature difference information, so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range; and controlling the defrosting unit to defrost the evaporator according to the frost layer information. By detecting the regional temperature difference information of the cold storage in real time, the make-up air unit and the guide air unit can be quickly controlled to form a directional convection balance temperature difference value according to the magnitude of the temperature difference value, ensuring the temperature uniformity inside the cold storage and reducing the regional temperature difference; by controlling the defrosting unit to defrost the evaporator by detecting the frost layer information in real time, frost-free energy consumption is avoided, thereby reducing defrosting energy consumption. Therefore, this application can reduce the regional temperature difference and defrosting energy consumption in cold storage. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the steps of a cold storage airflow distribution and defrosting control method provided in an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of a cold storage airflow distribution and defrosting control method provided in an embodiment of the present invention;

[0042] Figure 3 This is a structural block diagram of a cold storage airflow distribution and defrosting control system provided in an embodiment of the present invention;

[0043] Figure 4 This is a structural block diagram of a cold storage airflow distribution and defrosting control device provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0045] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, or the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0046] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0047] like Figure 1As shown, this embodiment of the invention provides a cold storage airflow distribution and defrosting control method, applied to the control module of a cold storage system. The cold storage system further includes a refrigeration module, an airflow distribution module, and a defrosting module. The control module is connected to the refrigeration module, the airflow distribution module, and the defrosting module respectively. The refrigeration module includes a main air cooler installed inside the cold storage, and an evaporator is installed inside the main air cooler. The airflow distribution module includes a temperature and humidity sensor unit, a makeup air unit, and an air guide unit. The makeup air unit is arranged opposite to the main air cooler, and the air guide unit is located at the air outlet of the main air cooler. The defrosting module includes a frost layer sensor unit and a defrosting unit. The steps included are as follows.

[0048] S100: Obtain the frost information detected in real time by the frost sensor unit, and the regional temperature difference information detected in real time by the temperature and humidity sensor unit.

[0049] Specifically, the temperature and humidity sensor unit of this application includes multiple temperature and humidity sensors evenly arranged within the cold storage. By detecting temperature and humidity information from each sensor, the temperature difference between different areas is determined, thus obtaining regional temperature difference information. For example, if multiple temperature and humidity sensors are distributed in a uniform grid pattern within the cold storage space, using high-precision, anti-condensation sensor types, they can collect temperature and humidity data from each area in real time and continuously transmit the data to the central control unit (i.e., the control module), providing data for temperature difference judgment. Based on the humidity information, the humidity value of each area can also be determined, thereby driving the dehumidification mechanism or main air cooler installed in the cold storage to balance the humidity in each area. The frost sensor unit can detect the frost thickness and temperature on the evaporator in real time, generating frost information, which is then transmitted to the control module. The control module then generates corresponding control commands to control the defrosting unit based on the frost information.

[0050] In some optional embodiments, the frost sensor unit includes a frost thickness sensor and an infrared temperature sensor, wherein the frost thickness sensor is disposed on the evaporator, and the infrared temperature sensor is disposed opposite to the frost thickness sensor; acquiring the frost information detected in real time by the frost sensor unit includes:

[0051] S110. Obtain the first detection signal of the frost thickness sensor, and generate the surface frost thickness information of the evaporator based on the first detection signal;

[0052] S120. Obtain the second detection signal from the infrared temperature sensor, and generate the surface temperature information of the evaporator based on the second detection signal;

[0053] S130. Configure the surface frost layer thickness information and the surface temperature information as the frost layer information.

[0054] Specifically, the frost thickness sensor is used to directly detect the thickness of the frost layer condensed on the evaporator surface. It is installed on the evaporator (in direct contact or close proximity to the evaporator surface to ensure accurate sensing of changes in frost thickness). Optionally, the frost thickness sensor is a non-contact, low-temperature interference-resistant sensor type (such as a microwave sensor), directly attached to the evaporator fin surface to detect the frost thickness on the fins in real time and transmit the frost thickness data to the control module.

[0055] An infrared temperature sensor is used to detect the surface temperature of the evaporator. It is positioned opposite to the frost thickness sensor (i.e., their detection areas overlap or correspond to the same location, ensuring that the temperature and frost thickness of the same surface area of ​​the evaporator are detected, and the data are correlated). Optionally, the infrared temperature sensor is selected for its rapid response and accurate measurement. The probe is aimed at the evaporator surface and works synchronously with the frost thickness sensor to collect temperature data of the evaporator surface, thereby assisting in determining the frost status.

[0056] When detecting the frost status of the evaporator, the control module first receives a first detection signal (which can be raw sensor data such as electrical signals or frequency signals) output from the frost thickness sensor. The first detection signal is parsed (e.g., converted using a preset algorithm) to generate surface frost thickness information (i.e., a quantified frost thickness value, such as millimeters or centimeters). Simultaneously, it receives a second detection signal (also raw sensor data, reflecting the physical quantity corresponding to temperature) output from the infrared temperature sensor; this second detection signal is parsed to generate surface temperature information (i.e., a quantified temperature value, such as degrees Celsius or Fahrenheit). The surface frost thickness information and surface temperature information are then correlated and integrated to form the frost information.

[0057] By using frost thickness to reflect the amount of frost and surface temperature to reflect the thermodynamic characteristics of the frost state (such as excessively low temperature may accelerate frost formation), combining frost thickness and surface temperature can more comprehensively determine whether the evaporator needs to be defrosted and when to defrost (avoiding misjudgments caused by relying solely on thickness, such as thin frost at extremely low temperatures may have already affected heat exchange efficiency), thus achieving multi-dimensional and accurate detection of the frost state of the evaporator.

[0058] S200. Control the air supply unit and the air guide unit according to the regional temperature difference information so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range.

[0059] Specifically, the make-up air unit is set opposite to the main air cooler. It can balance the air supply intensity of the main air cooler by supplementing the airflow (such as adjusting the make-up air volume and make-up air speed), thereby alleviating the problem of excessively high or low temperatures in local areas due to insufficient airflow.

[0060] The air guide unit is located at the air outlet of the main air cooler. By adjusting the air guide angle and air guide range (such as changing the direction of the louvers and the position of the guide plate), the cold air can be guided to spread more evenly to all areas of the cold storage, thus avoiding the accumulation of temperature in local areas.

[0061] If a temperature in a certain area is detected to be too high (the temperature difference with other areas exceeds the upper limit), the control module sends a command to control the air guide unit to direct more cold air to that area, and at the same time activates the air supply unit to supplement the airflow and enhance the cooling effect of that area; if the temperature in a certain area is too low (the temperature difference is below the lower limit), the air guide unit can reduce the cold air input to that area, or the air supply direction of the air supply unit can be adjusted to balance the local overcooling problem.

[0062] In some optional embodiments, controlling the air supply unit and the air guide unit according to the regional temperature difference information to ensure that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range includes:

[0063] S210. When the temperature difference information of the region indicates that the first temperature difference value of the first region is not within the preset temperature difference range, the first working time and first working mode of the air supply unit, the second working time and second working mode of the air guide unit are determined according to the first temperature difference value and the location information of the first region. The first working mode indicates that air is supplied to the first region with a first power, and the second working mode indicates that the main air cooler is adjusted to send air in a first direction with a second power. The first power is determined according to the first temperature difference value, and the second power and the first direction are determined according to the location information of the first region and the first temperature difference value.

[0064] S220. Control the air supply unit to supply air in the first working mode during the first working time, and control the air guide unit to guide air in the second working mode during the second working time, so that the first temperature difference value is within the preset temperature difference range.

[0065] Specifically, when the temperature and humidity sensor unit detects that the first temperature difference value of the first area (the temperature difference between this area and other areas) exceeds the preset temperature difference range (such as too high or too low), targeted regulation is initiated.

[0066] Based on the first temperature difference value and the location information of the first area, the control module calculates the specific operating parameters of the air supply unit and the air guide unit. The parameters of the air supply unit include: the first operating time, which is the duration the air supply operation needs to last; and the first operating mode, which includes the air supply direction and the first power: the air supply direction is the direction of air supply to the first area (directional air supply to avoid ineffective air delivery); the first power characterizes the intensity of the air supply (such as fan speed and air volume), determined by the first temperature difference value; the larger the temperature difference, the higher the power.

[0067] Parameters of the air guiding unit: Second working time, the duration for which air guiding adjustment needs to continue (can be set synchronously with the make-up air time or separately to ensure the effectiveness of cold air guidance). Second working mode, including first direction and second power. The first direction is the specific direction in which the cold air from the main air cooler needs to be guided to the first area (determined by the location information of the first area, such as guiding the air eastward if the area is on the east side); the second power represents the intensity of air guiding adjustment (such as the rotation speed and angle adjustment range of the air guide plate), which is jointly determined by the location information of the first area and the first temperature difference value. For example, the farther the area is from the main air cooler and the greater the temperature difference, the higher the air guiding power (to guide the cold air to the target area faster and more accurately). Optionally, the air guiding unit is installed at the air outlet of the main air cooler, using low-temperature resistant drive components (such as servo motors), which can achieve air guiding angle adjustment within the range of 0-90°. Its adjustment command is output by the control module, which can change the direction of cold air delivery of the main air cooler and form directional convection in conjunction with the auxiliary airflow device.

[0068] The control module issues commands to make the two units operate according to calculated parameters: the air supply unit provides directional air supply to the first area at a first power during the first working time; the air guiding unit directs the cold air from the main air cooler in the first direction (i.e., the first area) at a second power during the second working time. Through the synergistic effect of the two, the cold air supply to the first area is enhanced or its temperature is balanced, ultimately reducing the first temperature difference value to within the preset temperature difference range, thus achieving temperature equilibrium between this area and other areas.

[0069] In some optional embodiments, during the process of controlling the defrosting unit to defrost the evaporator in the third operating mode during the third operating time, the method further includes:

[0070] S230. When the thickness of the surface frost layer is less than or equal to the second preset thickness threshold and the surface temperature is greater than or equal to the second defrosting temperature threshold, obtain the working information of the defrosting unit.

[0071] S240. When the working information indicates that the defrosting unit is in working condition, turn off the defrosting unit and start the main air cooler.

[0072] S250. When the working information indicates that the defrosting unit is not in working condition, adjust the power of the main air cooler so that the similarity between the frost thickness change curve of the evaporator within a preset time and the preset change curve is greater than the similarity threshold.

[0073] Specifically, during the defrosting unit's operation at the third working time and in the third working mode, the control module continuously monitors the evaporator's status, ensuring that: the surface frost thickness is ≤ the second preset thickness threshold, indicating that the frost layer on the evaporator surface is thin enough to meet the thickness standard for stopping defrosting (e.g., frost thickness ≤ 0.5mm); and the surface temperature is ≥ the second defrosting temperature threshold, indicating that the evaporator surface temperature has reached or exceeded the temperature standard for stopping defrosting (e.g., temperature ≥ 5℃, ensuring that residual frost can melt naturally or not affect cooling efficiency).

[0074] The control module first obtains the defrosting unit's operating information (i.e., determines whether it is running), and then performs corresponding processing based on the situation:

[0075] If the defrosting unit is in operation, immediately shut it down (stop defrosting) and start the main air cooler (restore refrigeration). At this point, the frost layer is thin enough and the temperature is within the acceptable range; the defrosting objective has been achieved, and there is no need to continue defrosting. The cold storage should be restored promptly to prevent excessive temperature increases inside the storage.

[0076] If the defrosting unit is not in operation, adjust the power of the main air cooler (e.g., increase or decrease the cooling intensity) to ensure that the frost thickness change curve of the evaporator within a preset time has a similarity greater than the system's preset similarity threshold. At this point, defrosting is complete, but environmental fluctuations may cause abnormal frost thickness changes (e.g., excessively rapid re-frost formation or slow melting of residual frost). By adjusting the main air cooler power, guide the frost thickness to change according to a preset pattern (e.g., slowly and evenly maintaining a low thickness), ensuring the evaporator operates in a stable and efficient state, avoiding frequent start-ups and shutdowns of the defrosting unit, thus preventing unnecessary defrosting power consumption.

[0077] In some optional embodiments, the make-up air unit includes multiple auxiliary airflow devices evenly arranged along the length of the cold storage, each auxiliary airflow device including an air intake mechanism and an air outlet regulating mechanism. Determining the first operating time and first operating mode of the make-up air unit based on the first temperature difference value and the location information of the first area includes:

[0078] S211. Determine the target rotation speed and the first working time of the induced draft mechanism based on the first temperature difference value and the preset temperature difference balance air volume meter. The preset temperature difference balance air volume meter indicates the adjustable air volume corresponding to different temperature difference values. The target rotation speed is positively correlated with the first power.

[0079] Specifically, the make-up air unit consists of multiple auxiliary airflow devices, which are evenly arranged along the length of the cold storage (ensuring coverage of different areas). Each auxiliary airflow device includes an exhaust mechanism and an outlet regulating mechanism. The exhaust mechanism is responsible for generating airflow (such as a miniature fan), and its rotation speed determines the volume and intensity of the make-up air (i.e., the initial power). The outlet regulating mechanism is responsible for adjusting the direction of the airflow (such as rotatable louvers or deflectors), controlling the direction of the make-up airflow through angle adjustment.

[0080] First temperature difference value and preset temperature difference balance air volume table (this table is preset to the required air volume corresponding to different temperature difference values, for example, a temperature difference of more than 3°C corresponds to high air volume, and a temperature difference of more than 1°C corresponds to low air volume).

[0081] Based on the first temperature difference value, the required air volume is determined by looking up the table, and then converted into the target speed of the induced draft mechanism (the speed is positively correlated with the air volume, that is, positively correlated with the first power; the higher the speed, the greater the first power and the stronger the air supply).

[0082] At the same time, based on the temperature difference and the required air volume, determine the first working time that the air supply needs to continue (for example, a large temperature difference requires a longer air supply time, while a small temperature difference requires a shorter time).

[0083] S212. Determine the target adjustment angle of the air outlet adjustment mechanism based on the location information of the first area;

[0084] Specifically, the location information of the first area refers to its exact position within the cold storage, such as left, right, front, or rear. This location information is used to calculate the required rotation angle of the air conditioning mechanism (i.e., the target adjustment angle), ensuring that the airflow generated by the exhaust mechanism is precisely directed towards the first area (e.g., if the first area is on the east side, the air outlet angle is adjusted eastward).

[0085] S213. Configure the first working mode to control the air-guiding mechanism to rotate at the target speed during the first working time, and at the same time control the air outlet adjustment mechanism to adjust the air outlet direction of the air-guiding mechanism at the target adjustment angle, so that the air-guiding mechanism can supplement air to the first area.

[0086] Specifically, the first working mode is the specific operating mode of the air supply unit, which includes: the exhaust mechanism continuously rotating at the target speed during the first working time (ensuring the intensity and duration of the air supply); the outlet adjustment mechanism simultaneously fixing the outlet direction at the target adjustment angle (ensuring that the air supply is accurately directed to the first area). Through directional, quantitative, and timed air supply, sufficient airflow is supplied to the first area to quickly balance the temperature difference between it and other areas.

[0087] S300: Control the defrosting unit to defrost the evaporator according to the frost layer information.

[0088] Specifically, the frost information is composed of the surface frost thickness detected by the frost thickness sensor (e.g., frost thickness reaches 2mm) and the surface temperature detected by the infrared temperature sensor (e.g., evaporator surface temperature is as low as -10℃). These two parameters need to be judged together, rather than relying solely on the thickness (for example, even if the frost layer is not thick, if the surface temperature is too low and the frost layer becomes hard and affects the heat exchange efficiency, defrosting may still be initiated).

[0089] The control module compares the real-time frost information with the system's preset defrosting thresholds (such as the first preset thickness threshold and the first defrosting temperature threshold). If the surface frost thickness is greater than or equal to the preset thickness threshold (e.g., the frost layer is too thick, which hinders the heat exchange of the evaporator and leads to a decrease in cooling efficiency), and the surface temperature is less than or equal to the preset temperature threshold (e.g., the temperature is too low, the frost layer continues to condense and is difficult to melt naturally, so active defrosting is required), the defrosting unit is activated to defrost.

[0090] In some optional embodiments, controlling the defrosting unit to defrost the evaporator based on the frost layer information includes:

[0091] S310. When the frost layer information indicates that the surface frost layer thickness of the evaporator is greater than or equal to a first preset thickness threshold and the surface temperature of the evaporator is less than or equal to a first defrosting temperature threshold, the third working time and the third working mode of the defrosting unit are determined according to the surface frost layer thickness and the surface temperature. The third working mode indicates that the defrosting unit defrosts the evaporator with a third power.

[0092] Specifically, the control module determines whether to initiate defrosting based on frost layer information (surface frost thickness and surface temperature), which must simultaneously meet the following conditions:

[0093] Surface frost thickness ≥ first preset thickness threshold: For example, if the frost thickness reaches 2mm (preset standard), it means that the frost is thick enough to affect the heat exchange efficiency of the evaporator (excessive frost will hinder heat exchange and reduce the cooling effect).

[0094] Surface temperature ≤ first defrosting temperature threshold: For example, if the evaporator surface temperature is as low as -10℃ (preset standard), it means that the surface temperature is too low, the frost layer is easy to continue to condense and is difficult to melt naturally, and active defrosting intervention is required.

[0095] The defrosting unit will only be triggered when both conditions are met simultaneously (to avoid misjudgment caused by a single condition, such as when the frost layer is thick but the temperature is high, defrosting may not be necessary).

[0096] After defrosting is triggered, the control module calculates the operating parameters of the defrosting unit (third working time and third working mode) based on the current surface frost thickness and surface temperature:

[0097] Third working time: The duration required for defrosting operation. For example, the thicker the frost layer and the lower the temperature, the longer the third working time (to ensure the frost layer melts completely). Third working mode: The operating intensity of the defrosting unit, with the third power as the core indicator (such as defrosting heating power, hot gas defrosting gas flow rate, etc.).

[0098] S320. Control the defrosting unit to defrost the evaporator in the third working mode during the third working time.

[0099] Specifically, the control module issues instructions to make the defrosting unit operate according to the determined parameters: during the third working time, the defrosting unit continuously defrosts the evaporator with the third power (such as by heating with high-temperature refrigerant gas, electric heating, etc.) until the frost thickness and surface temperature reach the standard for stopping defrosting (such as the second preset thickness threshold and the second defrosting temperature threshold mentioned above).

[0100] In some optional embodiments, the refrigeration module further includes a compressor, a condenser, and a throttling valve. The compressor, the condenser, and the throttling valve are connected in series with the evaporator via refrigeration piping to form a closed refrigeration cycle. The defrosting unit includes a defrosting piping with its two ends connected to the compressor and the evaporator, respectively, and an electromagnetic control valve is installed on the defrosting piping. Determining the third operating time and the third operating mode of the defrosting unit based on the surface frost thickness and the surface temperature includes:

[0101] S311. Determine the target opening degree of the electromagnetic control valve and the third working time based on the surface frost layer thickness and the surface temperature;

[0102] S312. Configure the third working mode to control the electromagnetic control valve to open at the target opening degree during the third working time, so that the compressor delivers defrosting gas to the evaporator through the defrosting pipeline, wherein the defrosting gas is a high-temperature and high-pressure refrigerant gas.

[0103] Specifically, the refrigeration module consists of a compressor, condenser, expansion valve, and evaporator, which are connected in series via refrigeration piping to form a closed refrigeration cycle. Its conventional operating logic is as follows: the compressor compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, which is then cooled by the condenser into a high-pressure liquid refrigerant. The liquid refrigerant is then depressurized by the expansion valve to a low-temperature, low-pressure liquid refrigerant, which finally enters the evaporator to absorb heat and evaporate (absorbing heat from the cold storage to achieve cooling), thus completing the refrigeration cycle.

[0104] The defrosting unit is a branch structure of the refrigeration cycle, including: a defrosting pipeline, which is connected at both ends to the compressor's discharge end and the evaporator respectively, forming a pipeline that runs directly from the compressor to the evaporator (bypassing the condenser and expansion valve in the conventional cycle); and an electromagnetic control valve, which is installed on the defrosting pipeline and is used to control the opening and closing of the pipeline (i.e., to regulate the flow rate of defrosting gas).

[0105] The control module calculates the specific parameters required for defrosting based on the thickness and temperature of the frost layer on the evaporator surface: determining the target opening degree of the solenoid control valve and the third operating time. A thicker frost layer requires more defrosting heat, corresponding to a larger target opening degree of the solenoid control valve (allowing more high-temperature gas to enter) and a longer third operating time (ensuring sufficient heat). A lower surface temperature (more hard frost layer) also requires a larger opening degree and a longer defrosting gas delivery time to quickly raise the evaporator surface temperature and melt the hard frost. The target opening degree directly determines the flow rate of the defrosting gas (a larger opening degree results in a larger flow rate and more heat released per unit time); the third operating time determines the total heat supply (a longer time results in more total heat).

[0106] The third operating mode is the specific operating mode of the defrosting unit. During the third operating period, the solenoid control valve remains open at the target opening degree. At this time, the high-temperature, high-pressure refrigerant gas discharged from the compressor (i.e., defrosting gas) does not enter the condenser for cooling, but instead flows directly into the evaporator through the defrosting pipeline. The high-temperature gas releases heat within the evaporator (heating the evaporator surface), causing the frost layer to melt, thus achieving defrosting. This directly utilizes the waste heat of the refrigeration system, eliminating the need for additional heating equipment, resulting in energy savings and high efficiency.

[0107] In some alternative embodiments, such as Figure 2 As shown, Figure 2 This is a flowchart of the steps of a cold storage airflow distribution and defrosting control method according to the present invention. The steps of cold storage airflow distribution and defrosting control include, but are not limited to, steps 1 to 10.

[0108] Step 1: Start the cold storage system;

[0109] Step 2: The control module receives frost layer information and regional temperature difference information in real time;

[0110] Step 3: Determine if the temperature difference in the area is within the preset temperature difference range; if yes, proceed to step 6; otherwise, proceed to step 4.

[0111] Step 4: Adjust the air supply unit and air guide unit;

[0112] Step 5: The temperature difference between the areas is within the preset temperature difference range;

[0113] Step 6: Maintain the current running status;

[0114] Step 7: Determine if the defrosting conditions have been met based on the frost layer information; if so, proceed to step 8; otherwise, proceed to step 10.

[0115] Step 8: Start the defrosting unit;

[0116] Step 9: Frost layer removed;

[0117] Step 10: Continue the cooling operation.

[0118] For the technical problems that can be solved and the technical effects that can be obtained by each step or combination of steps 1 to 10 in this embodiment, please refer to the above embodiment, which will not be described in detail here.

[0119] Implementing the embodiments of the present invention has the following beneficial effects: The embodiments of the present invention provide a method for airflow distribution and defrosting control in cold storage, including: acquiring frost layer information detected in real time by the frost layer sensor unit, and regional temperature difference information detected in real time by the temperature and humidity sensor unit; controlling the make-up air unit and the guide air unit according to the regional temperature difference information, so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range; and controlling the defrosting unit to defrost the evaporator according to the frost layer information. By detecting the regional temperature difference information of the cold storage in real time, the make-up air unit and the guide air unit can be quickly controlled to form a directional convection balance temperature difference value according to the magnitude of the temperature difference value, ensuring the temperature uniformity inside the cold storage and reducing the regional temperature difference; by controlling the defrosting unit to defrost the evaporator by detecting the frost layer information in real time, frost-free energy consumption is avoided, thereby reducing defrosting energy consumption. Therefore, this application can reduce the regional temperature difference and defrosting energy consumption in cold storage.

[0120] Secondly, referring to Figure 3 This invention provides a cold storage airflow distribution and defrosting control system for implementing the above-mentioned method, comprising:

[0121] The first module is used to acquire frost information detected in real time by the frost sensor unit and regional temperature difference information detected in real time by the temperature and humidity sensor unit.

[0122] The second module is used to control the air supply unit and the air guide unit according to the regional temperature difference information, so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range.

[0123] The third module is used to control the defrosting unit to defrost the evaporator based on the frost layer information.

[0124] It is evident that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0125] Thirdly, referring to Figure 4 This invention provides a cold storage airflow distribution and defrosting control device, comprising:

[0126] At least one processor;

[0127] At least one memory for storing at least one program;

[0128] When at least one program is executed by at least one processor, the at least one processor implements the method described above.

[0129] It is evident that the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented in this device embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0130] Fourthly, this application also discloses a computer program product or computer program stored in a computer-readable storage medium. A processor of a computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, causing the computer device to perform the methods or systems described above. Similarly, the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0131] It is understood that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as processors, such as central processing units, digital information processors, or microprocessors executing software, or as hardware, or as integrated circuits, such as application-specific integrated circuits. Such software can be distributed on computer-readable media, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data information such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0132] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for airflow distribution and defrosting control in a cold storage facility, characterized in that, A control module for a cold storage system, the cold storage system further including a refrigeration module, an airflow distribution module, and a defrosting module, the control module being connected to the refrigeration module, the airflow distribution module, and the defrosting module respectively. The refrigeration module includes a main air cooler installed inside the cold storage, and an evaporator is installed inside the main air cooler. The airflow distribution module includes a temperature and humidity sensor unit, a makeup air unit, and an air guide unit. The makeup air unit is positioned opposite the main air cooler, and the air guide unit is located at the air outlet of the main air cooler. The defrosting module includes a frost layer sensor unit and a defrosting unit; the method includes: The frost layer information detected in real time by the frost layer sensor unit and the regional temperature difference information detected in real time by the temperature and humidity sensor unit are obtained. The air supply unit and the air guide unit are controlled according to the regional temperature difference information so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range. Controlling the defrosting unit to defrost the evaporator according to the frost layer information specifically includes: when the frost layer information indicates that the surface frost layer thickness of the evaporator is greater than or equal to a first preset thickness threshold, and the surface temperature of the evaporator is less than or equal to a first defrosting temperature threshold, determining a third working time and a third working mode of the defrosting unit based on the surface frost layer thickness and the surface temperature, wherein the third working mode indicates that the defrosting unit defrosts the evaporator with a third power; and controlling the defrosting unit to defrost the evaporator with the third working mode during the third working time; During the process of controlling the defrosting unit to defrost the evaporator in the third working mode during the third working time, the method further includes: When the thickness of the surface frost layer is less than or equal to a second preset thickness threshold and the surface temperature is greater than or equal to a second defrost temperature threshold, the working information of the defrost unit is obtained; When the working information indicates that the defrosting unit is in working condition, the defrosting unit is turned off and the main air cooler is started. When the working information indicates that the defrosting unit is not in working condition, the power of the main air cooler is adjusted so that the similarity between the frost thickness change curve of the evaporator within a preset time and the preset change curve is greater than the similarity threshold.

2. The method according to claim 1, characterized in that, The step of controlling the air supply unit and the air guide unit according to the regional temperature difference information to ensure that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range includes: When the temperature difference information of the region indicates that the first temperature difference value of the first region is not within the preset temperature difference range, the first working time and first working mode of the air supply unit, the second working time and second working mode of the air guide unit are determined according to the first temperature difference value and the location information of the first region. The first working mode indicates that air is supplied to the first region with a first power, and the second working mode indicates that the main air cooler is adjusted to send air in a first direction with a second power. The first power is determined according to the first temperature difference value, and the second power and the first direction are determined according to the location information of the first region and the first temperature difference value. The air supply unit is controlled to supply air in the first working mode during the first working time, and the air guide unit is controlled to guide air in the second working mode during the second working time, so that the first temperature difference value is within a preset temperature difference range.

3. The method according to claim 1, characterized in that, The frost layer sensor unit includes a frost layer thickness sensor and an infrared temperature sensor. The frost layer thickness sensor is disposed on the evaporator, and the infrared temperature sensor is disposed opposite to the frost layer thickness sensor. Acquiring the frost layer information detected in real time by the frost layer sensor unit includes: Acquire the first detection signal from the frost thickness sensor, and generate the surface frost thickness information of the evaporator based on the first detection signal; Acquire the second detection signal from the infrared temperature sensor, and generate the surface temperature information of the evaporator based on the second detection signal; The surface frost thickness information and the surface temperature information are configured as the frost information.

4. The method according to claim 2, characterized in that, The make-up air unit includes multiple auxiliary airflow devices evenly arranged along the length of the cold storage. Each auxiliary airflow device includes an exhaust fan and an exhaust regulating fan. Determining the first operating time and first operating mode of the make-up air unit based on the first temperature difference value and the location information of the first area includes: The target rotation speed and the first working time of the induced draft mechanism are determined based on the first temperature difference value and the preset temperature difference balance air volume meter. The preset temperature difference balance air volume meter indicates the adjustable air volume corresponding to different temperature difference values. The target rotation speed is positively correlated with the first power. The target adjustment angle of the air outlet adjustment mechanism is determined based on the location information of the first area. The first working mode is configured to control the air-guiding mechanism to rotate at the target speed during the first working time, and at the same time control the air outlet adjustment mechanism to adjust the air outlet direction of the air-guiding mechanism at the target adjustment angle, so that the air-guiding mechanism can supplement air to the first area.

5. The method according to claim 1, characterized in that, The refrigeration module further includes a compressor, a condenser, and a throttling valve. The compressor, the condenser, and the throttling valve are connected in series with the evaporator through refrigeration piping to form a closed refrigeration cycle. The defrosting unit includes a defrosting piping with its two ends connected to the compressor and the evaporator respectively, and an electromagnetic control valve is installed on the defrosting piping. Determining the third operating time and the third operating mode of the defrosting unit based on the surface frost thickness and the surface temperature includes: The target opening degree and the third working time of the electromagnetic control valve are determined based on the thickness of the surface frost layer and the surface temperature. The third operating mode is configured to control the electromagnetic control valve to open at the target opening degree during the third operating time, so that the compressor delivers defrosting gas to the evaporator through the defrosting pipeline, wherein the defrosting gas is a high-temperature and high-pressure refrigerant gas.

6. A cold storage airflow distribution and defrosting control system, characterized in that, To implement the method according to any one of claims 1-5, comprising: The first module is used to acquire frost information detected in real time by the frost sensor unit and regional temperature difference information detected in real time by the temperature and humidity sensor unit. The second module is used to control the region based on the regional temperature difference information, so that the regional temperature difference value indicated by the regional temperature difference information is within a preset temperature difference range. The third module is used to control the defrosting unit to defrost the evaporator according to the frost layer information. Specifically, it includes: when the frost layer information indicates that the surface frost layer thickness of the evaporator is greater than or equal to a first preset thickness threshold, and the surface temperature of the evaporator is less than or equal to a first defrosting temperature threshold, determining a third working time and a third working mode of the defrosting unit according to the surface frost layer thickness and the surface temperature, wherein the third working mode indicates that the defrosting unit defrosts the evaporator with a third power; and controlling the defrosting unit to defrost the evaporator with the third working mode during the third working time. During the process of controlling the defrosting unit to defrost the evaporator in the third working mode during the third working time, the method further includes: When the thickness of the surface frost layer is less than or equal to a second preset thickness threshold and the surface temperature is greater than or equal to a second defrost temperature threshold, the working information of the defrost unit is obtained; When the working information indicates that the defrosting unit is in working condition, the defrosting unit is turned off and the main air cooler is started. When the working information indicates that the defrosting unit is not in working condition, the power of the main air cooler is adjusted so that the similarity between the frost thickness change curve of the evaporator within a preset time and the preset change curve is greater than the similarity threshold.

7. A cold storage airflow distribution and defrosting control device, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor performs the method as described in any one of claims 1-5.

8. A computer-readable storage medium storing a processor-executable program, characterized in that, The processor-executable program, when executed by the processor, is used to perform the method as described in any one of claims 1-5.

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