A method and system for dynamic adjustment of air circulation in a refrigerator

Abstract

This invention relates to a method and system for dynamic adjustment and control of air circulation in a freezer, belonging to the field of refrigeration equipment technology. The control method provides the hardware foundation for air circulation control by vertically partitioning the freezer and setting auxiliary return air vents below each storage area. After initialization, the occupancy rate of each storage area is obtained by identifying the load of items on each layer, allowing the control strategy to match the actual load distribution. Based on the load-air outlet angle relationship function obtained from simulation experiments, the optimal air outlet deflection angle for the current cycle is calculated to ensure that cold air is delivered to the required area via the lowest energy consumption path. Furthermore, a mapping table is established, and the air outlet deflection angle, fan speed, and opening degree of each return air vent are dynamically adjusted according to the item occupancy rate, the current air outlet angle, and its difference from the previous cycle. This method achieves coordinated control of air supply and return, and can dynamically construct the optimal air circulation path based on the load distribution inside the freezer, improving the overall energy efficiency of the freezer.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration equipment technology, specifically relating to a method and system for dynamic adjustment and control of air circulation inside a freezer. Background Technology

[0002] Currently, energy consumption requirements for refrigerated display cases are becoming increasingly stringent, with higher energy efficiency standards. Traditional refrigerated display case designs are based on fixed airflow circulation, with fan rotation adjusted according to sensor-measured temperature and target set temperature, or simply rotating at a fixed speed. Under certain design standards, this can meet energy consumption requirements. However, in actual operation, the interior of a refrigerated display case is often not always fully loaded, and the load distribution is uneven. For example, in some vending machines, due to random purchases by users, most items are often located in the upper part of the cabinet, with only a small portion in the lower part. If traditional air circulation and refrigeration strategies are still used, traditional refrigeration systems are prone to wasting cooling capacity.

[0003] In the prior art, a Chinese invention patent application discloses a method for optimizing the temperature and humidity uniformity control of refrigerated cabinets in cold chain logistics. This method improves the temperature and humidity uniformity by collecting temperature and humidity data inside the cabinet and dynamically adjusting the total speed of the fan and the deflection angle of each air guide plate, based on the density of items stacked in different areas of the cabinet. However, this method only focuses on unidirectional adjustment of the air outlet and does not consider the coordinated control of the return air, making it difficult to construct an optimal air circulation path. The flow resistance and distribution efficiency of cold air inside the cabinet cannot be optimized, limiting further improvement in overall energy efficiency.

[0004] Therefore, how to provide a method for dynamically adjusting the air circulation of the air supply and return in a freezer is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method and system for dynamic adjustment and control of air circulation in a freezer. It achieves coordinated control of air supply and return, and can dynamically construct the optimal air circulation path according to the load distribution inside the freezer. This effectively reduces the resistance to cold air flow and optimizes the efficiency of cold energy distribution, thereby significantly reducing cold energy waste and improving the overall energy efficiency of the freezer under uneven load conditions.

[0006] This invention provides a method for dynamically adjusting and controlling air circulation inside a freezer, comprising the following steps:

[0007] Refrigerator zoning: The refrigeration chamber inside the refrigerator is divided into several storage areas along the vertical direction. An air outlet is set at the top of the refrigeration chamber, a basic return air outlet is set at the bottom of the refrigeration chamber, and an auxiliary return air outlet is set below each storage area.

[0008] Initialization: Set the initial values ​​of the air outlet deflection angle, fan speed, and opening of each return air vent when the freezer starts running; when the freezer starts running, it operates at full load, with the air outlet, fan speed, and opening of each return air vent all opened to the maximum. When the air outlet is opened to the maximum, the deflection angle of the air outlet is considered to be 0.

[0009] Data acquisition: The distribution of items on each shelf is identified by an image acquisition device to obtain the load volume of items on each shelf, and then the load volume of each storage area is obtained. The occupancy rate of items in each storage area and the occupancy rate of items in the refrigeration cavity are calculated.

[0010] Calculate the air outlet deflection angle: Through simulation experiments, obtain the air outlet deflection angle with the lowest energy consumption under different combinations of item occupancy rates on each shelf, and obtain the relationship function between item occupancy rate and air outlet deflection angle in each storage area based on the obtained data, and then calculate the air outlet deflection angle for the current cycle.

[0011] Dynamic adjustment: Establish a mapping table between the air outlet deflection angle and air circulation adjustment; based on the occupancy rate of items in the refrigeration chamber, the current cycle air outlet deflection angle and its difference from the previous cycle air outlet deflection angle, and in conjunction with the mapping table, adjust the air outlet deflection angle, fan speed and the opening of each return air vent.

[0012] This technical solution achieves coordinated control of air supply and return, and can dynamically construct the optimal air circulation path according to the load distribution inside the cabinet, effectively reducing the resistance of cold air flow and optimizing the efficiency of cold energy distribution. This significantly reduces cold energy waste under uneven load conditions and improves the overall energy efficiency of the refrigeration cabinet.

[0013] In some embodiments, the method for calculating the air outlet deflection angle in the current cycle includes: recording the item occupancy rate of each storage area as follows: , ... The current cycle's air outlet deflection angle is The relationship between the item occupancy rate of each storage area and the air outlet deflection angle is shown in equation (1):

[0014] (1);

[0015] In equation (1), , , These are the weighting coefficients. These are constant terms, all obtained through simulation experiments.

[0016] In some embodiments, the method for establishing a mapping table between the air outlet deflection angle and air circulation adjustment in the dynamic adjustment step is as follows: setting a threshold range for the air outlet deflection angle. , ,in, Fan speed includes , , ,in, Based on the calculated air outlet deflection angle, set the refrigerator's fan speed and the opening of each return air vent accordingly:

[0017] when At that time, the fan speed was Open the main return air vent to the maximum setting and the auxiliary return air vent to the minimum setting;

[0018] when At that time, the fan speed was Open the main return air vent to the maximum setting and the auxiliary return air vent to the medium setting;

[0019] when At that time, the fan speed was Open the main return air vent to the medium setting and the auxiliary return air vent to the maximum setting.

[0020] In some embodiments, the method for adjusting the outlet deflection angle and fan speed in the dynamic adjustment step, and correspondingly adjusting the opening of each return air vent, includes: recording the occupancy rate of items in the cooling cavity. ,

[0021] like If the load is greater than or equal to the set full load threshold, the entire cabinet is determined to be at full load, the outlet deflection angle is 0, and the fan speed is [value missing]. Both the main return air vent and the auxiliary return air vent are opened to their maximum settings;

[0022] like If the load is less than the set full load threshold, calculate the outlet deflection angle for the current cycle. It also makes an initial determination as to whether to adjust the air outlet deflection angle, fan speed, and opening of each return air outlet.

[0023] In some embodiments, the method for initially determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air vent includes: setting an outlet deflection angle threshold. , Record the air outlet deflection angle of the previous cycle as ,

[0024] like Then let And adjust the air outlet deflection angle to At the same time, according to the mapping table, the fan speed is set to... Open the main return air vent to the medium setting and the auxiliary return air vent to the maximum setting;

[0025] like Then continue calculating the outlet deflection angle for the current cycle. Air outlet deflection angle compared to the previous cycle The difference is used to determine whether to adjust the outlet deflection angle, fan speed, and opening of each return air outlet.

[0026] In some embodiments, the method for determining again whether to adjust the outlet deflection angle, fan speed, and opening of each return air outlet includes setting a threshold for changes in adjacent cycles. and The threshold of change over a period of time ,

[0027] like Then adjust the air outlet deflection angle to be And adjust the fan speed and the opening of each return air vent according to the mapping table;

[0028] like Then continue calculating the current cycle's outlet deflection angle and the previous cycle's... The difference in the outlet deflection angle before each cycle, based on its... The threshold of change over a period of time The size of the air outlet is used to determine whether to adjust the air outlet deflection angle, fan speed, and opening of each return air outlet.

[0029] In some embodiments, the method for finally determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air outlet includes:

[0030] like Then adjust the air outlet deflection angle to be And adjust the fan speed and the opening of each return air vent according to the mapping table;

[0031] like If the adjustment is not performed, the outlet deflection angle, fan speed and return air opening of the previous cycle will continue to be maintained.

[0032] Based on the above-described dynamic adjustment and control method for air circulation inside a freezer, the present invention also provides a dynamic adjustment and control system for air circulation inside a freezer, which employs the above-described dynamic adjustment and control method for air circulation inside a freezer, including:

[0033] The cabinet has a refrigeration chamber inside, which includes at least one storage area arranged vertically, and several shelves for placing items are installed in the storage area; a fan is installed between the rear of the refrigeration chamber and the cabinet, and a cabinet door for opening the refrigeration chamber is provided on the front of the refrigeration chamber.

[0034] The air outlet is installed on the top of the refrigeration chamber near the cabinet door. The air outlet is connected to the fan and is used to send the cold air generated by the fan into the refrigeration chamber. An adjustable airflow deflector is installed at the air outlet.

[0035] Return air vents are distributed inside the refrigeration chamber. Each return air vent is equipped with an independently adjustable damper. The return air vents work in conjunction with the air outlets to regulate the air circulation inside the refrigeration chamber of the freezer.

[0036] An image acquisition device, installed inside the refrigeration chamber, is used to acquire images of the distribution of items inside the refrigeration chamber.

[0037] This technical solution ensures that the deflector, damper, and fan can function in the actual air circulation process, optimizing air circulation within the freezer.

[0038] In some embodiments, the dynamic air circulation control system within the freezer further includes a control unit electrically connected to the fan, deflector, damper, and image acquisition device, respectively. The control unit is configured to:

[0039] The system acquires images captured by an image acquisition device and identifies the occupancy rate of items in each shelf, storage area, and refrigeration chamber based on these images.

[0040] Adjust the air outlet deflection angle and fan speed according to the occupancy rate of items in each storage area, and adjust the opening of each return air outlet accordingly.

[0041] In some embodiments, the return air vent includes a basic return air vent and an auxiliary return air vent. The basic return air vent is located at the bottom of the refrigeration chamber on the side near the cabinet door, and the auxiliary return air vent is located below each storage area on the side away from the cabinet door.

[0042] Based on the above scheme, the dynamic adjustment and control method and system for air circulation inside the freezer in this embodiment of the invention achieves closed-loop linkage control of air supply and return by coordinating the opening of the air outlet, fan, and each return air outlet (basic and auxiliary). This dynamically constructs an efficient directional airflow circulation, significantly improving the air circulation efficiency and temperature uniformity inside the freezer. Furthermore, by pre-establishing the occupancy rate-angle function and system control mapping table through simulation, a data-driven precise control method is provided, making the control actions predictable and systematic, ensuring the reliability and stability of energy efficiency optimization. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0044] Figure 1 This is a flowchart of the dynamic adjustment and control method for air circulation inside a freezer in an embodiment of the present invention;

[0045] Figure 2 This is a flowchart of the dynamic adjustment steps in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the dynamic adjustment and control system for air circulation inside the freezer in an embodiment of the present invention.

[0047] In the picture:

[0048] 1. Cabinet; 2. Shelves; 3. Fan; 4. Air outlet; 5. Basic return air outlet; 6. First auxiliary return air outlet; 7. Second auxiliary return air outlet; 8. First storage area; 9. Second storage area. Detailed Implementation

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] like Figure 1As shown, in one embodiment of the dynamic adjustment and control method and system for air circulation inside a freezer according to the present invention, the dynamic adjustment and control method for air circulation inside a freezer includes a freezer partitioning step, an initialization step, a data acquisition step, a step of calculating the deflection angle of the air outlet 4, and a dynamic adjustment step; wherein, the freezer partitioning step includes: dividing the refrigeration cavity inside the freezer into several storage areas along the vertical direction, and setting an air outlet 4 at the top of the refrigeration cavity, setting a basic return air inlet 5 at the bottom of the refrigeration cavity, and setting auxiliary return air inlets below each storage area; the initialization step includes: setting the initial values ​​of the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air inlet when the freezer starts to run; the freezer starts to run in a full-load state, and the air outlet, the fan speed, and the opening of each return air inlet are all opened to the maximum, and the deflection angle of the air outlet is considered to be 0 when the air outlet is opened to the maximum; the data acquisition step includes: through The image acquisition device identifies the distribution of items on each shelf 2, obtains the load volume of items on each shelf 2, and then obtains the load volume of each storage area, calculating the item occupancy rate in each storage area and the item occupancy rate in the refrigeration cavity; the step of calculating the deflection angle of the air outlet 4 includes: through simulation experiments, obtaining the deflection angle of the air outlet 4 with the lowest energy consumption under different combinations of item occupancy rates on each shelf 2, and obtaining the relationship function between the item occupancy rate of each storage area and the deflection angle of the air outlet 4 based on the obtained data, and then calculating the deflection angle of the air outlet 4 in the current cycle; the dynamic adjustment step includes: establishing a mapping table between the deflection angle of the air outlet 4 and the air circulation adjustment; based on the item occupancy rate in the refrigeration cavity, the deflection angle of the air outlet 4 in the current cycle and its difference from the deflection angle of the air outlet 4 in the previous cycle, combined with the mapping table, adjusting the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air outlet.

[0054] In the above illustrative embodiments, the dynamic adjustment and control method for air circulation in a freezer provided by the present invention provides a hardware foundation for refined air circulation control by vertically partitioning the freezer and setting auxiliary return air vents below each storage area. After initialization, the load of items on each layer is identified by an image acquisition device, accurately obtaining the item occupancy rate of each storage area, enabling the control strategy to precisely match the actual load distribution. Based on the load-air outlet angle relationship function obtained from simulation experiments, the optimal deflection angle of the air outlet 4 for the current cycle is calculated to ensure that the air outlet direction always guides cold air to the required area via the lowest energy consumption path. On this basis, a mapping table is established, and the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air vent are synchronously and dynamically adjusted according to the item occupancy rate, the current air outlet angle, and the difference from the previous cycle. This scheme realizes coordinated control of air outlet and return air, and can dynamically construct the optimal air circulation path according to the load distribution in the freezer, effectively reducing the resistance to cold air flow, optimizing the efficiency of cold energy distribution, thereby significantly reducing cold energy waste under uneven load conditions and improving the overall energy efficiency of the freezer.

[0055] In some embodiments, the method for calculating the deflection angle of the air outlet 4 in the current cycle includes: recording the item occupancy rate of each storage area as follows: , ... The deflection angle of the air outlet 4 in the current cycle is... The relationship between the item occupancy rate of each storage area and the deflection angle of the air outlet 4 is shown in equation (1):

[0056] (1);

[0057] In equation (1), , , These are the weighting coefficients. These are constant terms, all obtained through simulation experiments.

[0058] In some embodiments, each occupancy rate is calculated using equation (2):

[0059] (2);

[0060] In equation (2), It represents the ownership rate of items.

[0061] In some embodiments, the method for establishing the mapping table between the deflection angle of the air outlet 4 and the air circulation adjustment in the dynamic adjustment step is as follows: setting a threshold range for the deflection angle of the air outlet 4. , ,in, ; Fan speed 3 includes , , ,in, Based on the calculated deflection angle of the air outlet 4, the speed of the refrigerator's fan 3 and the opening of each return air vent are set accordingly:

[0062] when At that time, the speed of fan 3 was Open the main return air vent 5 to its maximum setting, and open the auxiliary return air vent to its minimum setting;

[0063] when At that time, the speed of fan 3 was Open the main return air vent 5 to the maximum setting, and open the auxiliary return air vent to the medium setting;

[0064] when At that time, the speed of fan 3 was Open the basic return air vent 5 to the medium setting and the auxiliary return air vent to the maximum setting.

[0065] In some embodiments, such as Figure 2As shown, the method for adjusting the deflection angle of the air outlet 4, the speed of the fan 3, and the corresponding opening of each return air outlet in the dynamic adjustment steps includes: recording the occupancy rate of items in the refrigeration cavity. ,

[0066] like If the load is greater than or equal to the set full load threshold, the entire cabinet is determined to be in a full load state. The deflection angle of air outlet 4 is set to 0, and the fan speed of fan 3 is set to... Both the basic return air vent 5 and the auxiliary return air vent are opened to their maximum positions;

[0067] like If the load is less than the set full load threshold, calculate the deflection angle of the air outlet in the current cycle. And initially determine whether to adjust the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air outlet.

[0068] In the above embodiments, when the cabinet is determined to be fully loaded, the deflection angle of the air outlet 4 is set to 0 (i.e., the air outlet 4 is opened to the maximum), the fan speed of the fan 3 is adjusted to the highest, and all return air outlets are fully opened, so as to cope with the high load condition with the maximum cooling capacity and ensure that the temperature inside the cabinet can reach the standard quickly when fully loaded.

[0069] As an illustrative example, the full load threshold is set to 85%, that is, when If the container is fully loaded, then the entire container is considered to be in a fully loaded state.

[0070] In some embodiments, such as Figure 2 As shown, the method for initially determining whether to adjust the air outlet deflection angle 4, fan speed 3, and opening of each return air outlet includes: setting an air outlet deflection angle threshold. , Record the deflection angle of air outlet 4 in the previous cycle as follows: ,

[0071] like Then let And adjust the air outlet deflection angle to At the same time, according to the mapping table, the speed of fan 3 is set to... 1. Open the basic return air vent 5 to the medium setting; 2. Open the auxiliary return air vent to the maximum setting.

[0072] like Then continue calculating the deflection angle of the air outlet 4 in the current cycle. Compared to the previous cycle, the air outlet has a 4-degree deflection angle. The difference is used to determine whether to adjust the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air outlet.

[0073] In some embodiments, such as Figure 2As shown, the method for determining again whether to adjust the deflection angle of air outlet 4, the speed of fan 3, and the opening of each return air outlet includes: setting threshold values ​​for changes in adjacent cycles. and The threshold of change over a period of time ,

[0074] like Then adjust the air outlet deflection angle to be And adjust the speed of fan 3 and the opening of each return air vent according to the mapping table;

[0075] like Then continue calculating the deflection angle of outlet 4 in the current cycle and The difference in the deflection angle of the air outlet 4 before each cycle, based on its... The threshold of change over a period of time The size is then used to determine whether to perform the adjustment.

[0076] In some embodiments, such as Figure 2 As shown, the final method for determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air vent includes:

[0077] like Then adjust the air outlet deflection angle to be And adjust the speed of fan 3 and the opening of each return air vent according to the mapping table;

[0078] like If the adjustment is not performed, the deflection angle of the air outlet 4, the speed of the fan 3, and the opening of each return air outlet will remain the same as in the previous cycle.

[0079] By setting a threshold for changes between adjacent periods and The threshold of change over a period of time A graded adjustment judgment mechanism was constructed: when the angle change between adjacent cycles exceeds... It adjusts immediately and responds quickly to significant changes in load distribution; when changes in adjacent cycles are small, it further examines the relationship with... Does the cumulative difference in angles from one cycle ago exceed [a certain threshold]? This mechanism captures long-term accumulated load changes; if neither of the two thresholds is reached, the current operating parameters remain unchanged. This mechanism filters out minor, unnecessary, and frequent adjustments caused by fluctuations, maintaining airflow stability and extending component lifespan, while also responding promptly to long-term accumulated load changes. At the same time, it maintains steady-state operation when no adjustments are needed to avoid additional energy consumption, achieving a balance between control stability, accuracy, and energy efficiency.

[0080] Based on the above-described dynamic adjustment and control method for air circulation inside a freezer, this invention also provides a dynamic adjustment and control system for air circulation inside a freezer, employing the aforementioned dynamic adjustment and control method for air circulation inside a freezer, such as... Figure 3 As shown, the refrigerator includes a cabinet 1, an air outlet 4, a return air outlet, and an image acquisition device. The cabinet 1 contains a refrigeration chamber, which includes at least one vertically arranged storage area with several shelves 2 for placing items. A fan 3 is installed between the rear of the refrigeration chamber and the cabinet 1, and a cabinet door is located at the front of the refrigeration chamber for opening it. The air outlet 4 is installed at the top of the refrigeration chamber near the cabinet door and is connected to the fan 3 to deliver cold air generated by the fan 3 into the refrigeration chamber. An adjustable airflow deflector is installed at the air outlet 4. Return air outlets are distributed within the refrigeration chamber, and each return air outlet is equipped with an independently adjustable damper. The return air outlets and air outlets 4 work together to regulate the air circulation within the refrigeration chamber. The image acquisition device is installed within the refrigeration chamber to acquire images of the distribution of items within the refrigeration chamber.

[0081] The dynamic air circulation adjustment and control system in the freezer in the above illustrative embodiment ensures that the deflector, air damper, and fan 3 can act on the actual air circulation process and optimize the air circulation in the freezer.

[0082] In some embodiments, the dynamic air circulation control system inside the freezer further includes a control unit, which is electrically connected to the fan 3, the guide vane, the damper, and the image acquisition device, respectively. The control unit is configured to:

[0083] The image acquisition device captures images, and the occupancy rate of items in each shelf 2, each storage area, and the refrigeration cavity is identified based on the images.

[0084] Adjust the deflection angle of the air outlet 4 and the speed of the fan 3 according to the occupancy rate of items in each storage area, and adjust the opening of each return air outlet accordingly.

[0085] In some embodiments, the return air vent includes a basic return air vent 5 and an auxiliary return air vent. The basic return air vent 5 is located at the bottom of the refrigeration chamber near the cabinet door, and the auxiliary return air vent is located below each storage area on the side away from the cabinet door. As an illustrative embodiment, such as... Figure 3 As shown, the refrigeration chamber inside the freezer includes a first storage area 8 and a second storage area 9. A first auxiliary air return vent 6 is provided on the side of the first storage area 8 away from the cabinet door, and a second auxiliary air return vent 7 is provided on the side of the second storage area 9 away from the cabinet door.

[0086] As an illustrative embodiment, the image acquisition device is a camera.

[0087] Example 1

[0088] To facilitate understanding, the method for calculating the deflection angle of the air outlet 4 in the dynamic adjustment and control method for air circulation inside the freezer provided by the present invention will be explained next through Example 1. After obtaining the deflection angle of the air outlet 4, the adjustment can be performed according to the adjustment method in the dynamic adjustment step, which will not be elaborated in this example.

[0089] Freezer partitioning: The refrigeration chamber inside the freezer is vertically divided into a first storage area 8 and a second storage area 9. An air outlet 4 is set at the top of the refrigeration chamber, and a basic return air outlet 5 is set at the bottom of the refrigeration chamber. A first auxiliary return air outlet 6 is set on the side of the first storage area 8 away from the cabinet door, and a second auxiliary return air outlet 7 is set on the side of the second storage area 9 away from the cabinet door.

[0090] Initialization: The freezer is set to run at full load when it starts running. The air outlet 4, the fan speed 3, and the opening of each return air outlet are all opened to the maximum. When the air outlet 4 is opened to the maximum, the deflection angle of the air outlet 4 is considered to be 0.

[0091] Data Acquisition: The distribution of items on each shelf 2 is identified by an image acquisition device (camera). The load volume and total volume in each shelf 2 are substituted into formula (2) to calculate the load volume of items on each shelf 2. Then, the load volume of the first storage area 8 and the second storage area 9 are obtained. The item occupancy rate of the first storage area 8 and the second storage area 9 and the item occupancy rate in the refrigeration cavity are calculated. ;

[0092] Calculate the deflection angle of air outlet 4: Through simulation experiments, obtain the deflection angle of air outlet 4 with the lowest energy consumption under different combinations of item occupancy rates on each shelf 2, and obtain the relationship function between item occupancy rate and air outlet 4 deflection angle for each storage area based on the obtained data; specifically, the item occupancy rate of the first storage area 8... Item occupancy rate in the second storage area 9 The value range is 0-100. Several levels are selected for sample combination. Based on the refrigerator structure, CFD flow field simulation is performed. Based on the flow field changes, several candidate air outlet deflection angles are selected. Different deflection angles are determined through energy consumption tests. The optimal air outlet deflection angle corresponding to the lowest energy consumption of the freezer is shown in Table 1.

[0093]

[0094] Table 1. Optimal air outlet deflection angle and item occupancy data under the lowest energy consumption.

[0095] Based on the experimental data, the occupancy rate of 8 items in the first storage area was obtained. Item occupancy rate in the second storage area (9 items) The relationship function between the air outlet 4 deflection angle and the air outlet 4 is shown in equation (3):

[0096] (3);

[0097] That is, in this first embodiment, a simulation test is conducted based on the structure of the freezer, and the weighting coefficient is calculated by fitting the energy consumption test data. , constant term .

[0098] It should be noted that the weighting coefficients and constant values ​​calculated in the above embodiments are only illustrative examples. The actual values ​​may vary depending on the structure of the freezer. The fitting results differ. Example 1 achieves the following: as the load on each storage area increases, the deflection angle of the air outlet 4 decreases, tending towards a large air circulation within the cabinet; as the load on each storage area decreases, the deflection angle of the air outlet 4 increases, tending towards a small air circulation within the cabinet; and the impact of the item occupancy rate of the first storage area 8 on the deflection angle of the air outlet 4 is less than the impact of the item occupancy rate of the second storage area 9 on the deflection angle of the air outlet 4. That is, when the item occupancy rate of the second storage area 9 is small and the item occupancy rate of the first storage area 8 is large, it is easy to form a small circulation around the load of the first storage area, achieving the purpose of energy saving.

[0099] Through the description of several embodiments of the dynamic adjustment and control method and system for air circulation inside a freezer of the present invention, it can be seen that the embodiments of the dynamic adjustment and control method and system for air circulation inside a freezer of the present invention have at least one or more of the following advantages:

[0100] 1. The dynamic adjustment and control method for air circulation in the freezer provided by the present invention calculates the optimal air outlet deflection angle for the current cycle based on the load and air outlet angle relationship function obtained from simulation experiments, so as to ensure that the air outlet direction always guides the cold air to the required area in the lowest energy consumption path.

[0101] 2. The dynamic adjustment and control method for air circulation in the freezer provided by the present invention realizes the coordinated control of air supply and return, and can dynamically construct the optimal air circulation path according to the load distribution in the freezer, effectively reduce the resistance of cold air flow, optimize the efficiency of cold energy distribution, thereby significantly reducing cold energy waste under uneven load conditions and improving the overall energy efficiency of the freezer.

[0102] 3. The dynamic air circulation adjustment and control system for the freezer provided by the present invention ensures that the guide plate, air door and fan 3 can act on the actual air circulation process and optimize the air circulation in the freezer.

[0103] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for dynamically adjusting and controlling air circulation inside a freezer, characterized in that, Includes the following steps: Refrigerator zoning: The refrigeration chamber inside the refrigerator is divided into several storage areas along the vertical direction. An air outlet is set at the top of the refrigeration chamber, a basic return air outlet is set at the bottom of the refrigeration chamber, and an auxiliary return air outlet is set below each storage area. Initialization: Set the initial values ​​of the air outlet deflection angle, fan speed, and opening of each return air vent when the freezer starts running; when the freezer starts running, it operates at full load, with the air outlet, fan speed, and opening of each return air vent all opened to the maximum. When the air outlet is opened to the maximum, the deflection angle of the air outlet is considered to be 0. Data acquisition: The distribution of items on each shelf is identified by an image acquisition device to obtain the load volume of items on each shelf, and then the load volume of each storage area is obtained. The occupancy rate of items in each storage area and the occupancy rate of items in the refrigeration cavity are calculated. Calculate the air outlet deflection angle: Through simulation experiments, obtain the air outlet deflection angle with the lowest energy consumption under different combinations of item occupancy rates on each shelf, and obtain the relationship function between item occupancy rate and air outlet deflection angle in each storage area based on the obtained data, and then calculate the air outlet deflection angle for the current cycle. The method for calculating the air outlet deflection angle for the current cycle includes: recording the item occupancy rate of each storage area as follows: , ... The current cycle's air outlet deflection angle is The relationship between the item occupancy rate of each storage area and the air outlet deflection angle is shown in equation (1): （1）； In equation (1), , , These are the weighting coefficients. These are constant terms, all obtained through simulation experiments; Dynamic adjustment: Establish a mapping table between air outlet deflection angle and air circulation adjustment; based on the occupancy rate of items in the cooling chamber, the current cycle's air outlet deflection angle, and the difference between the current cycle's and the previous cycle's air outlet deflection angle, and in conjunction with the mapping table, adjust the air outlet deflection angle, fan speed, and the opening of each return air vent; the method for establishing the mapping table between air outlet deflection angle and air circulation adjustment is as follows: set a threshold range for the air outlet deflection angle. , ,in, Fan speed includes , , ,in, Based on the calculated air outlet deflection angle, set the refrigerator's fan speed and the opening of each return air vent accordingly: when At that time, the fan speed was Open the main return air vent to the maximum setting and the auxiliary return air vent to the minimum setting; when At that time, the fan speed was Open the main return air vent to the maximum setting and the auxiliary return air vent to the medium setting; when At that time, the fan speed was Open the main return air vent to the medium setting and the auxiliary return air vent to the maximum setting.

2. The method for dynamic adjustment and control of air circulation inside a freezer according to claim 1, characterized in that, In the dynamic adjustment process, the methods for adjusting the outlet deflection angle, fan speed, and correspondingly adjusting the opening of each return air vent include: recording the occupancy rate of items inside the refrigeration chamber. , like If the load is greater than or equal to the set full load threshold, the entire cabinet is determined to be at full load. The outlet deflection angle is set to 0, and the fan speed is set to... Both the main return air vent and the auxiliary return air vent are opened to their maximum settings; like If the load is less than the set full load threshold, calculate the outlet deflection angle for the current cycle. It also makes an initial determination as to whether to adjust the air outlet deflection angle, fan speed, and opening of each return air outlet.

3. The method for dynamic adjustment and control of air circulation inside a freezer according to claim 2, characterized in that, The initial method for determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air vent includes: setting an outlet deflection angle threshold. , Record the air outlet deflection angle of the previous cycle as , like Then let And adjust the air outlet deflection angle to At the same time, according to the mapping table, the fan speed is set to... Open the main return air vent to the medium setting and the auxiliary return air vent to the maximum setting; like Then continue calculating the outlet deflection angle for the current cycle. Air outlet deflection angle compared to the previous cycle The difference is used to determine whether to adjust the outlet deflection angle, fan speed, and opening of each return air outlet.

4. The method for dynamic adjustment and control of air circulation in a freezer according to claim 3, characterized in that, The method for re-determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air vent includes setting threshold values ​​for changes between adjacent cycles. and The threshold of change over a period of time , like Then adjust the air outlet deflection angle to be And adjust the fan speed and the opening of each return air vent according to the mapping table; like Then continue calculating the current cycle air outlet deflection angle and The difference in the outlet deflection angle before each cycle, based on its... The threshold of change over a period of time The size of the air outlet is used to determine whether to adjust the air outlet deflection angle, fan speed, and opening of each return air outlet.

5. The method for dynamic adjustment and control of air circulation inside a freezer according to claim 4, characterized in that, Finally, the methods for determining whether to adjust the outlet deflection angle, fan speed, and opening of each return air vent include: like Then adjust the air outlet deflection angle to be And adjust the fan speed and the opening of each return air vent according to the mapping table; like If the adjustment is not performed, the outlet deflection angle, fan speed and return air opening of the previous cycle will continue to be maintained.

6. A dynamic air circulation adjustment and control system for a freezer, characterized in that, The method for dynamic adjustment and control of air circulation inside a freezer as described in any one of claims 1-5 includes: The cabinet has a refrigeration chamber inside, which includes at least one storage area arranged vertically, and several shelves for placing items are installed in the storage area; a fan is installed between the rear of the refrigeration chamber and the cabinet, and a cabinet door for opening the refrigeration chamber is provided on the front of the refrigeration chamber. The air outlet is installed on the top of the refrigeration chamber near the cabinet door. The air outlet is connected to the fan and is used to send the cold air generated by the fan into the refrigeration chamber. An adjustable airflow deflector is installed at the air outlet. Return air vents are distributed inside the refrigeration chamber. Each return air vent is equipped with an independently adjustable damper. The return air vents work in conjunction with the air outlets to regulate the air circulation inside the refrigeration chamber of the freezer. An image acquisition device, installed inside the refrigeration chamber, is used to acquire images of the distribution of items inside the refrigeration chamber; The control unit, which is electrically connected to the fan, guide vane, damper, and image acquisition device, is configured as follows: The system acquires images captured by an image acquisition device and identifies the occupancy rate of items in each shelf, storage area, and refrigeration chamber based on these images. Adjust the air outlet deflection angle and fan speed according to the occupancy rate of items in each storage area, and adjust the opening of each return air outlet accordingly.

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