Refrigeration equipment

Abstract

The invention relates to the technical field of refrigeration, and discloses refrigeration equipment. The refrigeration equipment comprises a freezing chamber provided with a freezing liner; the refrigerating chamber is provided with a refrigerating inner container, the refrigerating inner container and the freezing inner container are arranged in a spaced mode, a heat exchange cavity is formed between the refrigerating inner container and the freezing inner container, and the refrigerating inner container is provided with a first air inlet and a first air outlet which communicate with the heat exchange cavity; the first cold accumulation piece is arranged in the heat exchange cavity and located on the side close to the freezing chamber; the draught fan is arranged in the refrigerating chamber and is configured to drive air in the heat exchange cavity to enter the refrigerating chamber through the first air inlet and then return to the heat exchange cavity through the first air outlet, and airflow circulation is formed. In this way, the heat preservation performance of the refrigerating chamber in the power-off state and the temperature uniformity of the refrigerating chamber in the running state can be improved, the situation that the temperature recovery speed of the refrigerating chamber in an electric power unstable area is too high is avoided, and the temperature of the refrigerating chamber is always within the safe storage range in a cold storage buffering and indirect air cooling mode.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, specifically to a refrigeration device. Background Technology

[0002] Refrigeration and freezing equipment is a common storage system that combines refrigerated and frozen storage areas, widely used for the preservation and freezing of food, pharmaceuticals, and other goods. Currently, mainstream refrigeration and freezing equipment primarily employs two methods for cooling the refrigerated compartment: one involves direct contact between the evaporator and the inner liner, achieving cooling through direct heat exchange; the other uses a finned evaporator, where a fan forces air through the finned evaporator for heat exchange before the cooled air is blown into the compartment. However, the evaporator's temperature fluctuates due to factors such as ambient temperature and heat load, resulting in poor temperature uniformity within the refrigerated compartment. Furthermore, because the evaporator directly cools the air inside the compartment, and air has limited heat storage capacity, this type of refrigeration and freezing equipment has a shorter heat retention time.

[0003] The related technology provides a refrigeration device, which includes a refrigerator compartment, a freezer compartment, a foam layer, a heat exchanger, and heat exchange plates. An evaporator is installed in the freezer compartment. The foam layer is disposed between the refrigerator compartment and the freezer compartment. The heat exchanger is disposed inside the foam layer or inside the freezer compartment near the foam layer, and contains a refrigerant. A first end of the heat exchange plate is connected to the heat exchanger, and a second end of the heat exchange plate passes through the foam layer and extends into the refrigerator compartment, thereby using the refrigerant to cool the refrigerator compartment through thermal radiation.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art: In related technologies, the refrigeration of cold storage relies on indirect heat exchange between heat exchange fins and air through thermal radiation. The cooling capacity is limited to the amount of heat exchange between the heat exchange fins and the air, resulting in low cooling efficiency and uneven temperature distribution in the cold storage. Since refrigerated items such as vaccines have high temperature requirements, excessively low local temperatures in the cold storage can easily cause the vaccines to freeze and break.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a refrigeration device to improve the temperature uniformity of a cold storage compartment.

[0008] According to a first aspect of the present invention, a refrigeration device is provided, comprising: a freezer compartment having a freezer inner liner; a refrigerator compartment having a refrigerator inner liner, the refrigerator inner liner and the freezer inner liner being spaced apart, a heat exchange chamber being constructed between the refrigerator inner liner and the freezer inner liner, the refrigerator inner liner having a first air inlet and a first air outlet communicating with the heat exchange chamber; a first cold storage element disposed in the heat exchange chamber and located on the side closer to the freezer compartment; and a fan disposed in the refrigerator compartment and configured to drive air in the heat exchange chamber to enter the refrigerator compartment through the first air inlet and then return to the heat exchange chamber through the first air outlet, forming an airflow circulation.

[0009] Optionally, the freezer inner liner includes a first freezer side panel near the refrigerator compartment, and the refrigeration equipment further includes a cold storage evaporator disposed on the outer surface of the first freezer side panel, and a first cold storage element is attached to the cold storage evaporator.

[0010] Optionally, the refrigerator liner includes a first refrigerator side panel near the freezer compartment, a first air inlet and a first air outlet are provided on the first refrigerator side panel, and the refrigeration equipment further includes: a second cold storage element, provided on the outer surface of the first refrigerator side panel, for buffering the cold energy transferred from the heat exchange chamber to the refrigerator compartment.

[0011] Optionally, the first cold storage element is filled with a first phase change material, the phase change temperature of which is greater than -10℃ and less than or equal to -7℃.

[0012] Optionally, the second cold storage element is filled with a second phase change material, the phase change temperature of which is greater than or equal to 0 ℃ and less than or equal to 4 ℃.

[0013] Optionally, the refrigeration equipment further includes: a partition disposed in the heat exchange chamber to divide the heat exchange chamber into a first air duct near the freezer compartment and a second air duct near the refrigerator compartment; wherein, a first cold storage element is disposed in the first air duct; the partition is provided with a second air inlet and a second air outlet, the air cooled by the first cold storage element enters the second air duct through the second air outlet from the first air duct, and the air delivered from the refrigerator compartment flows into the first air duct through the second air inlet from the second air duct.

[0014] Optionally, the first air inlet is located at the upper part of the refrigerator liner, and the first air outlet is located at the lower part of the refrigerator liner; the fan is located at the first air inlet; the second air outlet is located at the upper part of the partition, and is used to introduce the airflow cooled by the first cold storage component into the second air duct; the second air inlet is located at the lower part of the partition, and is used to guide the return airflow flowing out of the refrigerator compartment into the first air duct.

[0015] Optionally, the refrigeration equipment further includes: a compressor, a condenser, a cold storage solenoid valve, a cold storage capillary tube, a refrigeration solenoid valve, a refrigeration capillary tube, and a refrigeration evaporator. The compressor's discharge port is connected to the condenser's inlet. The condenser's outlet is connected to both the inlet of the cold storage solenoid valve and the inlet of the refrigeration solenoid valve. The cold storage solenoid valve, the cold storage capillary tube, and the cold storage evaporator are connected in series to form a cold storage branch, and the cold storage evaporator is used to cool the first cold storage element. The refrigeration solenoid valve, the refrigeration capillary tube, and the refrigeration evaporator are connected in series to form a refrigeration branch, and the refrigeration evaporator is used to cool the freezer compartment. The outlet of the cold storage evaporator and the outlet of the refrigeration evaporator merge and are connected to the compressor's suction port.

[0016] Optionally, the refrigeration equipment further includes: a first temperature sensor, located in the first cold storage element, for detecting the cold storage temperature of the first cold storage element; a second temperature sensor, located in the freezer compartment, for detecting the freezing temperature of the freezer compartment; and a controller connected to the first temperature sensor, the second temperature sensor, the compressor, the cold storage solenoid valve, and the freezing solenoid valve, configured to: turn on the compressor, the cold storage solenoid valve, and the freezing solenoid valve when the freezing temperature is greater than the preset freezing temperature value and the cold storage temperature is greater than the preset cold storage temperature value; turn on the compressor and the cold storage solenoid valve and close the freezing solenoid valve when the freezing temperature is less than or equal to the preset freezing temperature value and the cold storage temperature is greater than the preset cold storage temperature value; turn on the compressor and the freezing solenoid valve and close the cold storage solenoid valve when the freezing temperature is greater than the preset freezing temperature value and the cold storage temperature is less than or equal to the preset cold storage temperature value; and turn off the compressor when the freezing temperature is less than or equal to the preset freezing temperature value and the cold storage temperature is less than or equal to the preset cold storage temperature value.

[0017] Optionally, the refrigeration equipment further includes: a third temperature sensor, located in the cold storage compartment, for detecting the refrigeration temperature of the cold storage compartment; wherein, the controller is connected to both the third temperature sensor and the fan, and the controller is configured to: control the fan to operate at a first speed when the refrigeration temperature is greater than a first temperature threshold; control the fan to operate at a second speed when the refrigeration temperature is less than or equal to the first temperature threshold and greater than a second temperature threshold; control the fan to stop operating or operate at a minimum safe speed when the refrigeration temperature is less than or equal to the second temperature threshold; wherein, the first temperature threshold is greater than the second temperature threshold, the first speed is greater than the second speed, and the second speed is greater than the minimum safe speed.

[0018] Optionally, the refrigeration equipment also includes: a backup battery electrically connected to the fan, and a controller configured to periodically start and stop the fan based on the refrigeration temperature detected by a third temperature sensor in the event of a power outage.

[0019] The refrigeration equipment provided in this disclosure can achieve the following technical effects: By constructing an independent heat exchange chamber between the freezer and refrigerator compartments, and installing a first cold storage element within this chamber, a forced airflow is created between the heat exchange chamber and the refrigerator compartment using a fan. Cold energy is first transferred from the freezer side to the first cold storage element in the heat exchange chamber. The fan then delivers the pre-cooled air from the first cold storage element into the refrigerator compartment, allowing the refrigerator compartment to indirectly absorb cold energy and preventing localized excessively low temperatures. Due to the high heat capacity and latent heat of phase change of the first cold storage element, its surface temperature remains stable, preventing drastic temperature fluctuations in the cold air. This also improves the refrigerator compartment's insulation performance during power outages and temperature uniformity during operation, preventing rapid temperature rise in areas with unstable power. Through cold storage buffering and indirect air cooling, the refrigerator compartment temperature is consistently maintained within a safe storage range.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein: Figure 1 This is a schematic diagram of the structure of a refrigeration device provided in an embodiment of this disclosure; Figure 2 This is a cross-sectional schematic diagram of a refrigeration device provided in an embodiment of this disclosure; Figure 3 This is a cross-sectional schematic diagram of another refrigeration device provided in an embodiment of this disclosure; Figure 4 This is a cross-sectional schematic diagram of another refrigeration device provided in an embodiment of this disclosure; Figure 5 This is a cross-sectional schematic diagram of another refrigeration device provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of the structure of the partition provided in the embodiment of this disclosure; Figure 7 This is a schematic diagram of a refrigeration system of a refrigeration device provided in an embodiment of this disclosure.

[0022] Figure label: 10: Freezer compartment; 11: Freezer inner liner; 111: First freezer side panel; 112: Second freezer side panel; 12: Freezer inner door; 20: Refrigerator compartment; 21: Refrigerator inner liner; 211: First refrigerator side panel; 22: First air inlet; 23: First air outlet; 24: Refrigerator inner door; 30: Cabinet body; 31: Heat exchange chamber; 311: First air duct; 312: Second air duct; 32: Insulation layer; 40: First cold storage component; 50: Fan; 60: Cold storage evaporator; 70: Second cold storage component; 80: Baffle; 81: Second air inlet; 82: Second air outlet; 90: Compressor; 91: Condenser; 92: Cold storage solenoid valve; 93: Cold storage capillary tube; 94: Refrigeration solenoid valve; 95: Refrigeration capillary tube; 96: Refrigeration evaporator; 97: Liquid receiver; 101: Cold storage branch; 102: Refrigeration branch. Detailed Implementation

[0023] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0024] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0025] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0026] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0027] Unless otherwise stated, the term "multiple" means two or more.

[0028] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0029] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0031] Combination Figure 1-5 As shown, this embodiment of the present disclosure provides a refrigeration device, including a freezer compartment 10, a refrigerator compartment 20, a first cold storage element 40, and a fan 50. The freezer compartment 10 is provided with a freezer inner liner 11; the refrigerator compartment 20 is provided with a refrigerator inner liner 21, which is spaced apart from the freezer inner liner 11. A heat exchange chamber 31 is constructed between the refrigerator inner liner 21 and the freezer inner liner 11. The refrigerator inner liner 21 is provided with a first air inlet 22 and a first air outlet 23 communicating with the heat exchange chamber 31; the first cold storage element 40 is disposed in the heat exchange chamber 31 and located on the side closer to the freezer compartment 10; the fan 50 is disposed in the refrigerator compartment 20 and is configured to drive the air in the heat exchange chamber 31 to enter the refrigerator compartment 20 through the first air inlet 22 and then return to the heat exchange chamber 31 through the first air outlet 23, forming an airflow circulation.

[0032] Combination Figure 1 As shown, the refrigeration equipment includes a cabinet 30, inside which are a refrigerator inner liner 21 and a freezer inner liner 11. Insulation layers 32 are provided between the refrigerator inner liner 21 and the freezer inner liner 11 and the cabinet 30. The refrigerator inner liner 21 forms the refrigeration space of the refrigerator compartment 20, and the freezer inner liner 11 forms the freezing space of the freezer compartment 10. A heat exchange chamber 31 is located between the refrigerator inner liner 21 and the freezer inner liner 11. A first cold storage element 40 is located within the heat exchange chamber 31, near the freezer compartment 10, and is used to absorb and store the cold energy from the freezer compartment 10.

[0033] Combination Figure 3As shown, the freezer compartment 10 and the refrigerator compartment 20 are spaced apart. The freezer inner liner 11 includes a first freezer side plate 111 near the refrigerator compartment 20, and the refrigerator inner liner 21 includes a first refrigerator side plate 211 near the freezer compartment 10. The heat exchange chamber 31 is located between the first freezer side plate 111 and the first refrigerator side plate 211. In other words, the heat exchange chamber 31 is sandwiched between the refrigerator inner liner 21 and the freezer inner liner 11.

[0034] A fan 50 is located inside the cold storage compartment 20. The air inlet side of the fan 50 faces the heat exchange chamber 31, and the air outlet side of the fan 50 faces the cold storage compartment 20. The fan 50 is configured to drive the air in the heat exchange chamber 31 into the cold storage compartment 20 through the first air inlet 22, and drive the air in the cold storage compartment 20 back into the heat exchange chamber 31 through the first air outlet 23, thereby forming a continuous airflow circulation. The forced air-cooled heat exchange achieved by the fan 50 can improve the cooling speed of the cold storage product and reduce humidity.

[0035] During operation, the cold air in the freezer compartment 10 is transferred to the first cold storage element 40 through the side panel of the freezer liner 11. The first cold storage element 40 cools and stores the cold air. The fan 50 starts, sending the air cooled by the first cold storage element 40 from the heat exchange chamber 31 through the first air inlet 22 into the refrigerator compartment 20 to cool the refrigerator compartment 20. After heat exchange, the air flows back from the refrigerator compartment 20 through the first air outlet 23 to the heat exchange chamber 31, where it comes into contact with the first cold storage element 40 again for cooling, and this cycle repeats. This indirect air-cooling method avoids the low-temperature evaporator or cold air from directly entering the refrigerator compartment 20. Because the cold air comes from the heat exchange chamber 31 rather than directly from the low-temperature evaporator, it can prevent the initial air temperature from being too low, thus effectively preventing localized low temperatures in the refrigerator compartment 20 from freezing and damaging refrigerated items such as vaccines. It also improves temperature uniformity and insulation performance during power outages. At the same time, forced circulation ensures thorough mixing of the air in the refrigerator compartment 20, effectively improving temperature uniformity. In addition, even in the event of a power outage, the first cold storage element 40 can continue to release cold energy, effectively extending the heat preservation time.

[0036] The refrigeration equipment provided in this embodiment constructs an independent heat exchange chamber 31 between the freezer inner liner 11 and the refrigerator inner liner 21, and installs a first cold storage element 40 within the heat exchange chamber 31. Simultaneously, a fan 50 drives air to form a forced circulation airflow between the heat exchange chamber 31 and the refrigerator compartment 20. Cold energy is first transferred from the freezer compartment 10 side to the first cold storage element 40 within the heat exchange chamber 31. Then, the fan 50 sends the pre-cooled air from the first cold storage element 40 into the refrigerator compartment 20, allowing the refrigerator compartment 20 to indirectly acquire cold energy, thereby preventing excessively low local temperatures within the refrigerator compartment 20. Because the first cold storage element 40 has high heat capacity and latent heat of phase change, its surface temperature is stable, further preventing drastic fluctuations in cold air temperature. This also improves the insulation performance of the cold storage compartment 20 during power outages and the temperature uniformity during operation, preventing the temperature of the cold storage compartment 20 in areas with unstable power from rising too quickly. Through cold storage buffering and indirect air cooling, the temperature of the cold storage compartment 20 is kept within a safe storage range.

[0037] Optionally, combined Figure 3 As shown, the refrigeration equipment includes a cabinet 30, which has a cabinet opening. The refrigerator compartment 20 and the freezer compartment 10 are both located inside the cabinet 30. The refrigerator inner liner 21 includes a front side panel and a rear side panel, which both extend toward the freezer inner liner 11. The extension plates of the front side panel and the rear side panel, together with the refrigerator inner liner 21, the freezer inner liner 11 and the cabinet opening, form a sealed heat exchange chamber 31.

[0038] The front and rear side panels of the refrigerated inner liner 21 extend toward the frozen inner liner 11, that is, they extend along the length or width of the cabinet 30. The length direction of the cabinet is as follows: Figure 1 As indicated by the middle arrow (x-direction). The width direction of the box is as follows. Figure 1 As indicated by the middle arrow y-direction. For example, when the refrigerator compartment 20 and the freezer compartment 10 are arranged along the length of the cabinet 30, the front and rear side panels of the refrigerator inner liner 21 are positioned opposite each other along the width of the cabinet 30. The front and rear side panels of the refrigerator inner liner 21 extend along the length of the cabinet 30 towards the freezer inner liner 11, and together with the freezer inner liner 11, the refrigerator inner liner 21 body, and the cabinet opening of the cabinet 30, they enclose a sealed heat exchange cavity 31, constructing an independent, sealed intermediate heat exchange space. The sealed heat exchange cavity 31 means that there is no direct air communication between the heat exchange cavity 31 and the external environment of the cabinet 30 or other unrelated compartments except for the refrigerator compartment 20, forming a closed internal airflow channel space. For example, the heat exchange cavity 31 has no direct air communication with the gaps in the foam layer, the cabinet door area, etc. This can prevent cold energy from directly interfering through the edges of the cabinet 30 or the gaps in the foam layer, effectively improving the sealing and thermal insulation performance of the heat exchange cavity 31.

[0039] Meanwhile, the sealed structure ensures that the air flowing through the heat exchange chamber 31 can only circulate with the refrigerator compartment 20 through pre-designed air ducts, such as the first air inlet 22 and the first air outlet 23, thus making the airflow path controllable and the heat exchange efficiency high. Furthermore, this sealed structure eliminates the need for additional complex seals; the cavity can be formed simply by extending the refrigerator liner 21 itself. This simplifies the assembly process and reduces manufacturing costs. Alternatively, the front and rear side panels of the freezer liner 11 can extend towards the refrigerator liner 21 to form the sealed heat exchange chamber 31.

[0040] Optionally, a heat insulation strip is provided between the extension plate of the front side panel and the extension plate of the rear side panel of the refrigerator inner liner 21 and the freezer inner liner 11 to block direct heat conduction between the refrigerator inner liner 21 and the freezer inner liner 11.

[0041] The extension plate of the refrigerator inner liner 21 does not directly contact the freezer inner liner 11. The two are separated by a heat insulation strip, which can prevent heat transfer between the freezer inner liner 11 and the refrigerator inner liner 21 and prevent the refrigerator inner liner 21 from becoming too cold.

[0042] Optionally, the thermal insulation strip is a plastic strip.

[0043] The heat insulation strip can be made of acrylonitrile-butadiene-styrene copolymer or polypropylene, etc., which are plastic strips with low thermal conductivity. The plastic strip has a rectangular cross-section and is installed between the front and rear extension plates of the refrigerator inner liner 21 and the side plates of the freezer inner liner 11. It effectively isolates the thermal bridge formed by the metal contact between the extension plates of the refrigerator inner liner 21 and the side plates of the freezer inner liner 11, and prevents abnormal temperature drop in the area of ​​the refrigerator compartment 20 near the freezer compartment 10.

[0044] Optionally, the size of the heat insulation strip is adapted to the size of the refrigerator liner 21 and the freezer liner 11 to tightly fill the gap between the front and rear extension plates of the refrigerator liner 21 and the freezer liner 11.

[0045] The dimensions of the heat insulation strip are compatible with the dimensions of the refrigerator inner liner 21 and the freezer inner liner 11, meaning the length of the heat insulation strip is consistent with the depth of the refrigerator inner liner 21 or the freezer inner liner 11 of the cabinet 30. The width of the heat insulation strip is consistent with the width of the extension plate of the refrigerator inner liner 21. The depth direction of the refrigerator inner liner 21 or the freezer inner liner 11 is the same as the depth direction of the cabinet 30, as shown in the figure. Figure 1As indicated by the middle arrow z, the front and rear side panels of the refrigerator liner 21 extend towards the freezer compartment 10, forming a vertical gap along the depth direction of the cabinet 30. The insulation strip is embedded along the entire length of this vertical gap, completely covering and tightly filling the gap between the extended panels of the refrigerator liner 21 and the freezer liner 11. This effectively blocks direct contact between the metal liners, preventing cold air from being conducted from the freezer compartment 10 to the surface of the refrigerator liner 20 due to thermal bridging, and preventing abnormal temperature drops in the area of ​​the refrigerator compartment 20 near the freezer side, thus meeting the anti-freeze safety requirements.

[0046] Optionally, combined Figure 2 As shown, the opening of the refrigerator compartment 20 and the opening of the freezer compartment 10 are respectively provided with an independent refrigerator inner door 24 and a freezer inner door 12. The refrigerator inner door can open or close the refrigerator space of the refrigerator compartment 20, and the freezer inner door can open or close the freezer space of the freezer compartment 10.

[0047] Both the refrigerator inner door 24 and the freezer inner door 12 are located at the cabinet opening of the refrigeration equipment body 30, blocking the cold air from the freezer compartment 10 from directly entering the refrigerator compartment 20 through the top opening, thus preventing the cold air from being directly transferred through the cabinet opening and preventing the temperature of the refrigerator compartment 20 from becoming too low. This also prevents a large amount of cold air from being lost when the door is opened, improving insulation.

[0048] The fan 50 can be any of a centrifugal fan, axial fan, or cross-flow fan. The fan 50 can be an ultra-thin DC centrifugal fan, which has a smaller thickness, higher air pressure, and can rotate 90°, making it easy to install on the upper part of the first refrigeration side panel 211. It can effectively overcome flow resistance and supports speed regulation, dynamically adjusting the air volume according to the temperature of the refrigeration compartment 20. The fan 50 can also be a miniature cross-flow fan, which provides uniform airflow and low operating noise, suitable for structural layouts requiring high temperature uniformity and low duct resistance. During installation, it is arranged laterally along the first refrigeration side panel 211, achieving surface airflow through a long strip-shaped air outlet. The fan 50 can also be a small axial fan with a guide shroud.

[0049] Optionally, combined Figure 3 As shown, the freezer inner liner 11 includes a first freezer side panel 111 near the side of the refrigerator compartment 20. The refrigeration equipment also includes a cold storage evaporator 60, which is disposed on the outer surface of the first freezer side panel 111. The first cold storage component 40 is attached to the cold storage evaporator 60.

[0050] The cold storage evaporator 60 is directly integrated onto the outer surface of the first freezing side plate 111 of the freezer inner liner 11 and physically bonded to the first cold storage element 40, forming a highly efficient heat conduction path from the cold storage evaporator 60 to the cold storage evaporator 60. When the refrigerant evaporates inside the cold storage evaporator 60, the cold energy is directly conducted through the metal wall to the phase change material (PCM) inside the first cold storage element 40, achieving rapid cold storage. This surface contact thermal coupling can effectively improve heat transfer efficiency. At the same time, because the cold storage evaporator 60 is dedicated to supplying cooling for the first cold storage element 40, the operation of the cold storage evaporator 60 can be independent of the freezing evaporator 96 that cools the freezer compartment 10, allowing the system to prioritize cold storage during off-peak electricity hours and improve energy efficiency. In addition, the first cold storage element 40, as a cold energy buffer, can continuously supply cooling for the refrigerator compartment 20 when the compressor 90 is off, avoiding temperature fluctuations caused by frequent start-stop cycles, thereby effectively improving the temperature stability of the refrigerator compartment 20 and meeting the storage requirements of sensitive items such as vaccines.

[0051] Optionally, combined Figure 3 As shown, the first cold storage element 40 is sized to match the cold storage evaporator 60.

[0052] The size of the first cold storage element 40 is matched with that of the cold storage evaporator 60. This means that the first cold storage element 40 can cover the outer surface of the cold storage evaporator 60, thereby achieving a large-area close fit between the two, reducing contact thermal resistance, effectively improving the conduction efficiency of cold energy from the cold storage evaporator 60 to the first cold storage element 40, and avoiding local cold energy accumulation or heat transfer blind spots, so that cold storage is uniform and fast.

[0053] Optionally, the first cold storage element 40 is a cold storage ice block.

[0054] The first cold storage component 40 can be a cold storage ice bar, which is a sealed shell structure filled with a first phase change material, such as water, sodium sulfate decahydrate, fatty acid organic PCM, or a low-temperature eutectic salt solution. The cold storage ice bar is attached to the outer surface of the cold storage evaporator 60 and located in the first air duct 311 of the heat exchange chamber 31. During the operation of the refrigeration system, it can quickly absorb and store cold energy through the cold storage evaporator 60. When the compressor 90 stops or is powered off, the cold storage ice bar releases the stored cold energy to maintain a stable air temperature in the heat exchange chamber 31. This allows the fan 50 to continuously supply cold air to the cold storage chamber 20, ensuring that the cold storage chamber 20 can maintain a vaccine storage temperature range of 2°C to 8°C for a long time without external cooling, and effectively avoiding the risk of local overcooling caused by the direct intrusion of cold energy from the freezer chamber 10.

[0055] The refrigeration equipment of this embodiment includes a refrigerator compartment 20 and a freezer compartment 10. A cold storage ice block is installed on one side of the freezer compartment 10, and a separate cold storage evaporator 60 supplies cooling to the ice block. A sealed space, serving as a heat exchange chamber 31, is provided between the refrigerator compartment 20 and the freezer compartment 10. This sealed space is divided into a first air duct 311 near the freezer compartment 10 and a second air duct 312 near the refrigerator compartment 20. The air from the first air duct 311 directly exchanges heat with the ice block and the evaporator due to the action of the fan 50. Afterward, it mixes with the air in the second air duct 312 and is blown into the refrigerator compartment 20, preventing the vaccine from freezing due to excessively low air temperature. The cooling capacity can be controlled by the configuration of the first and second air ducts 311 and the start / stop of the fan 50. Low temperature also reduces the humidity in the refrigerator compartment 20.

[0056] Optionally, the cold storage evaporator 60 is a blown evaporator.

[0057] The blown evaporator has a flat flow channel structure, with a large contact area and low thermal resistance with the first cold storage element 40, which can achieve efficient and uniform cold energy transfer, which is conducive to the rapid freezing of the first cold storage element 40, and improves the cold storage efficiency and power outage insulation performance.

[0058] Optionally, combined Figure 3 and Figure 4 As shown, the refrigerator liner 21 includes a first refrigerator side panel 211 near the freezer compartment 10, a first air inlet 22 and a first air outlet 23 are opened on the first refrigerator side panel 211, and the refrigeration equipment also includes a second cold storage element 70, which is disposed on the outer surface of the first refrigerator side panel 211 and is used to buffer the cold energy transferred from the heat exchange chamber 31 to the refrigerator compartment 20.

[0059] By installing a second cold storage element 70 on the outer surface of the first refrigerated side panel 211, when abnormal cold transfer occurs in the heat exchange chamber 31, such as when the fan 50 is accidentally started, control is delayed, or during the initial recovery period after a power outage, the second cold storage element 70 preferentially absorbs excess cold and undergoes a phase change. This suppresses a sudden drop in temperature of the first refrigerated side panel 211 of the refrigerated inner liner 21, preventing the temperature of the refrigerated inner liner 21 from becoming too low and effectively preventing sensitive items such as vaccines from freezing due to contact with the excessively cold inner wall. This meets the Class A antifreeze requirements, ensuring that the temperature at any point inside the refrigerated compartment 20 is greater than or equal to -0.5 ℃. The second cold storage element 70 can also provide cooling to the refrigerated compartment 20 when releasing cold.

[0060] By utilizing the first cold storage element 40 for low-temperature cold storage and the second cold storage element 70 for freeze protection and buffering, a two-stage cold capacity management mechanism can be constructed. The first cold storage element 40 efficiently stores cold capacity during refrigeration, ensuring continuous cooling during power outages or when the compressor 90 stops. The second cold storage element 70 absorbs excess or transient cold capacity transferred from the heat exchange chamber 31 to the refrigerator compartment 20, preventing the wall temperature of the refrigerator liner 21 from dropping below 0°C. This improves insulation performance while effectively avoiding the risk of vaccine freezing due to localized overcooling, meeting the World Health Organization's Class A freeze protection and temperature stability requirements.

[0061] Optionally, combined Figure 3 As shown, the dimensions of the second cold storage element 70 are adapted to the dimensions of the first refrigerated side panel 211.

[0062] The dimensions of the second cold storage element 70 are adapted to the dimensions of the first refrigerated side panel 211, meaning that the second cold storage element 70 is substantially consistent with the first refrigerated side panel 211 in both length and height. This allows for a large-area, tight fit between the second cold storage element 70 and the first refrigerated side panel, maximizing the thermal contact area and thus efficiently absorbing transient or excessive cold energy transferred from the heat exchange chamber 31 to the refrigerated compartment 20. This effectively suppresses sudden drops in local temperature on the wall of the refrigerated inner liner 21, preventing it from falling below 0°C.

[0063] Optionally, the second cold storage element 70 is a second cold storage ice block.

[0064] The second cold storage component 70 can adopt a cold storage ice grid structure, which can form a sealed, durable and heat-capacity stable phase change unit, and is easy to install on the outer surface of the first refrigeration side plate 211.

[0065] Optionally, combined Figure 4 As shown, the first air outlet 23 includes a plurality of first ventilation holes, which are evenly distributed along the width direction of the refrigerator liner 21.

[0066] This expands the return air area and reduces local wind speed. It can be understood that the multiple first ventilation holes can also be evenly distributed along the depth direction of the refrigerator liner 21, or arranged in a matrix. The first air outlet 23 includes multiple groups of first ventilation holes, which are spaced apart along the length direction of the refrigerator liner 21, and each group of first ventilation holes includes multiple first ventilation holes arranged along the depth direction of the refrigerator liner 21. For example... Figure 4 As shown, the first air outlet 23 includes two first ventilation hole groups, which are arranged at intervals along the length of the refrigerator liner 21. Each first ventilation hole group includes three first ventilation holes arranged along the depth of the refrigerator liner 21.

[0067] Optionally, combined Figure 4 As shown, the first ventilation hole has a strip-shaped or rectangular structure. This can improve the airflow capacity and reduce airflow noise within a limited opening area.

[0068] Optionally, the first cold storage element 40 is filled with a first phase change material, the phase change temperature of which is greater than -10℃ and less than or equal to -7℃.

[0069] The operating temperature range of the freezer compartment 10 is typically -20℃ to -10℃. The phase change temperature range of the first phase change material is higher than that of the freezer compartment 10, allowing the first phase change material to freeze completely during the refrigeration cycle and fully store cold energy. The phase change temperature range of the first phase change material is -10℃ to -7℃, enabling it to effectively solidify and store cold energy when the freezer compartment operates within the -20℃ to -10℃ range, while also maintaining the temperature within the refrigerator compartment stably within the target range during the release phase of the first phase change material. During the release phase, the release temperature of the first phase change material, after being mixed with the airflow, can stably maintain the refrigerator compartment 20 within the range of 2℃ to 8℃. This avoids both freezing failure due to excessively high phase change temperatures and insufficient cold storage or excessively low release temperatures due to excessively low phase change temperatures. It is understandable that the first phase change material can adopt any phase change temperature in the range of -18 ℃ to -8 ℃, such as -18 ℃, -15 ℃, -12 ℃, -10 ℃, -8 ℃, etc.

[0070] The refrigeration system includes an independent cold storage branch 101. A first cold storage element 40 is attached to the outer surface of the cold storage evaporator 60. The cold storage branch is equipped with a cold storage solenoid valve 92, which can control the surface temperature of the cold storage evaporator within the range of -12 ℃ to -9 ℃. The first cold storage element 40 is attached to the outer surface of the cold storage evaporator, and the phase change temperature of the first phase change material is set between -10 ℃ and -7 ℃. This ensures that when the freezer chamber 10 operates at its highest temperature of -10 ℃, the cold storage evaporator can still provide a heat transfer driving force greater than or equal to 1 ℃, allowing the first phase change material to completely solidify and store cold.

[0071] Optionally, the first phase change material is a PCM with a phase change temperature of -8 °C.

[0072] The first phase change material is selected as -8 ℃ phase change material, which gives it a supercooling margin of about 2 ℃ at the set temperature of the -10 ℃ freezer compartment. This allows for rapid and complete freezing while avoiding insufficient heat release rate due to excessively low phase change temperature. This phase change temperature point can balance cold storage efficiency and heat release driving force, optimizing the overall energy efficiency and thermal insulation performance of the unit.

[0073] The first phase change material can be selected from a calcium chloride-sodium chloride eutectic salt solution, a KCl-NaCl-H2O ternary eutectic system, or a fatty acid mixture, with a phase change temperature between -18 ℃ and -8 ℃.

[0074] Optionally, the second cold storage element 70 is filled with a second phase change material, the phase change temperature of which is greater than or equal to 0 ℃ and less than or equal to 4 ℃.

[0075] The operating temperature of the cold storage compartment 20 is typically 2℃ to 8℃. This phase change temperature range is close to the lower limit of 2℃ for the cold storage compartment 20. When abnormal cold air enters the heat exchange chamber 31 or the fan 50 malfunctions, causing a low-temperature airflow to impact the inner liner 21, the second phase change material preferentially absorbs cold energy and solidifies, maintaining the wall temperature of the inner liner 21 above 0℃, thus forming a passive antifreeze safety barrier and effectively preventing sensitive items such as vaccines from freezing. Simultaneously, the phase change temperature of the second phase change material is 0℃ to 4℃, and the operating temperature of the cold storage compartment 20 is typically 2℃ to 8℃. Therefore, during the operation of the cold storage compartment, the second cold storage element can release cold. It can be understood that the second phase change material can use any phase change temperature within the range of 0℃ to 4℃, such as 0℃, 1℃, 2℃, 3℃, 4℃, etc.

[0076] Optionally, the second phase change material is water at 0 °C.

[0077] Using water as the second phase change material is inexpensive, non-toxic, environmentally friendly, and has a high latent heat of phase change. When a solid-liquid phase change occurs at 0 ℃, it can absorb a large amount of heat without significant cooling, providing a strong buffer against transient cold shocks. At the same time, its phase change platform is located precisely at the antifreeze critical point, which can accurately prevent the surface of the refrigerator inner liner 21 from falling below 0 ℃, meeting the rigid requirements for antifreeze.

[0078] Optionally, the second phase change material is a PCM with a phase change temperature of 4 °C.

[0079] The second phase change material is selected at 4 ℃, which causes a phase change in the middle of the normal operating temperature range of 2 ℃ to 8 ℃ in the cold storage compartment 20. It can not only absorb excess cold to prevent overcooling, but also release heat to suppress the temperature rise when the ambient temperature fluctuates. It can regulate the wall temperature of the inner liner 21 in both directions and improve the overall temperature stability and uniformity.

[0080] The second phase change material can be deionized water, and a nucleating agent can be added to prevent overcooling; its phase change temperature is 0 °C. Alternatively, the second phase change material can be a mixture of decanoic acid and lauric acid, with a phase change temperature of 4 °C. Exemplarily, the first cold storage element 40 is filled with a CaCl2-NaCl eutectic salt solution with a phase change temperature of -10 °C, and the second cold storage element 70 is filled with deionized water at 0 °C.

[0081] Optionally, combined Figure 3 , Figure 5 and Figure 6As shown, the refrigeration equipment also includes a partition 80, which is disposed in the heat exchange chamber 31 to divide the heat exchange chamber 31 into a first air duct 311 near the freezer compartment 10 and a second air duct 312 near the refrigerator compartment 20; wherein, the first cold storage element 40 is disposed in the first air duct 311; the partition 80 is provided with a second air inlet 81 and a second air outlet 82, the air cooled by the first cold storage element 40 enters the second air duct 312 through the second air outlet 82 from the first air duct 311, and the air sent out by the refrigerator compartment 20 flows into the first air duct 311 through the second air inlet 81 from the second air duct 312.

[0082] A fan 50 is installed at the first air inlet 22 of the refrigerator compartment 20, drawing air from the second air duct 312 and sending it into the refrigerator compartment 20, creating a local negative pressure within the second air duct 312. This results in the pressure inside the refrigerator compartment 20 being slightly higher than that in the heat exchange chamber 31. Driven by this pressure difference, the air inside the refrigerator compartment 20 circulates and flows out from the first air outlet 23 before entering the second air duct 312. Simultaneously, the low-temperature air cooled by the first cold storage element 40 is discharged into the second air duct 312 through the second air outlet 82 on the partition 80. The low-temperature air and the return airflow from the refrigerator compartment 20 converge and mix within the second air duct 312, forming a uniformly temperatured mixed airflow. This mixed airflow is then drawn in by the fan 50 and reintroduced into the refrigerator compartment 20, completing the airflow circulation. This mixing mechanism effectively prevents localized overcooling caused by directly blowing low-temperature cold air into the refrigerator compartment 20, resulting in minimal temperature fluctuations and high uniformity within the refrigerator compartment 20.

[0083] In the event of a sudden power outage or unstable power supply, the cold energy stored in the first cold storage unit 40 can be continuously released. Combined with the thermal buffering effect of the second cold storage unit 70, this effectively slows down the temperature rise in the refrigerator compartment 20. Simultaneously, because the heat exchange chamber 31 is divided into a first air duct 311 and a second air duct 312 by the partition 80, even without the fan 50, the extremely low temperature air from the freezer compartment 10 cannot directly enter the refrigerator compartment 20, fundamentally avoiding the risk of localized freezing caused by direct cold airflow or sudden cold surges. Therefore, this dual-air duct structure not only achieves uniform airflow through air mixing during normal operation but also provides dual protection of passive thermal isolation and stable cold release under abnormal conditions such as power outages, extending the effective insulation time and ensuring that temperature-sensitive items such as vaccines remain within a safe storage temperature range even under extreme conditions.

[0084] Optionally, combined Figure 3 As shown, the second cold storage element 70 is located inside the second air duct 312.

[0085] The partition 80 divides the heat exchange chamber 31 into a first air duct 311 near the freezer compartment 10 and a second air duct 312 near the refrigerator compartment 20. The first cold storage element 40 is located in the first air duct 311, and the second cold storage element 70 is located in the second air duct 312. The placement of the second cold storage element 70 in the second air duct 312 avoids direct cooling by the extremely low temperature of the first cold storage element 40, allowing the operating temperature of the second cold storage element 70 to be closer to the refrigeration requirements, thereby more effectively playing the role of an anti-freeze barrier.

[0086] Optionally, the partition 80 is made of heat-insulating material.

[0087] The insulating partition 80 effectively blocks heat conduction between the first air duct 311 and the second air duct 312, preventing the low temperature of the first air duct 311 on the freezing side from being directly transferred to the second air duct 312 on the refrigeration side through the partition 80 wall. This achieves independent temperature zones for the two air ducts, ensuring that cooling is transferred only through the controlled airflow path of the second air inlet 81 and the second air outlet 82, rather than through solid heat conduction. This also reduces cooling loss in non-airflow paths, improving system energy efficiency. The partition 80 can be made of insulating materials with low thermal conductivity, such as expanded polystyrene, extruded polystyrene, or rigid polyurethane, achieving high-efficiency insulation while ensuring structural strength.

[0088] Only one fan 50 is installed inside the refrigeration equipment; no additional fan 50 is installed in the partition 80 or the first air duct 311, which reduces space occupation. Simultaneously, through reasonable design of the air duct resistance and air outlet size, a single fan 50 can drive a complete airflow circulation. This allows the airflow to flow out of the refrigerator compartment 20, sequentially through the second air duct 312 and the first air duct 311. In the first air duct 311, it is cooled by the first cold storage element 40. The cooled airflow returns to the second air duct 312 and then is sent back into the refrigerator compartment 20. Under the suction of the fan 50, the return airflow from the refrigerator compartment 20 enters the second air duct 312 through the first air outlet 23, then enters the first air duct 311 through the second air inlet 81 of the partition 80. The return airflow flows through the first cold storage element 40 and the cold storage evaporator 60 for cooling and dehumidification, then flows out from the second air outlet 82. It then mixes with the air in the second air duct 312 and is blown into the refrigerator compartment 20 by the fan 50. The single-fan 50 solution simplifies the structure, reduces costs, and avoids airflow turbulence caused by interference from multiple fans 50, which is conducive to forming a stable and predictable mixed air supply mode.

[0089] By adjusting the relative positions of the fan 50 and the second air outlet 82 on the baffle 80, as well as the opening area of ​​the second air outlet 82, the flow rate of cooling air entering the second air duct 312 can be controlled. A guide shroud can also be added to the airflow path of the second air outlet 82 to optimize the airflow direction and promote thorough mixing of cold air and return air in the upper part of the second air duct 312. This allows for flexible adjustment of the supply air temperature, meeting cooling requirements while preventing overcooling.

[0090] Optionally, combined Figure 6 As shown, the second air outlet 82 includes a plurality of second ventilation hole groups, which are arranged at intervals along the width direction of the partition 80, and each second ventilation hole group includes a plurality of second ventilation holes arranged along the length direction of the partition 80.

[0091] like Figure 6 As shown, the second air outlet 82 includes two second ventilation hole groups, each of which includes two rectangular second ventilation holes arranged vertically. The distribution of multiple second ventilation hole groups can expand the coverage of cold air, allowing cooling air to be injected into the second air duct 312 from multiple points and evenly from the upper part of the partition 80, forming a three-dimensional mixture with the rising return air, effectively improving the uniformity of the supply air temperature and avoiding the risk of local freezing caused by strong cooling at a single point.

[0092] Optionally, combined Figure 6 As shown, the second air inlet 81 includes a plurality of third ventilation hole groups, which are arranged at intervals along the width direction of the partition 80, and each third ventilation hole group includes a plurality of third ventilation holes arranged along the length direction of the partition 80.

[0093] like Figure 6 As shown, the second air inlet 81 includes two third ventilation hole groups, each of which includes two third ventilation holes arranged vertically. The return air design of multiple third ventilation hole groups can increase the return air area, reduce the return air velocity, reduce airflow noise, and ensure that the air in the second air duct 312 and the bottom area of ​​the refrigerator compartment 20 can effectively participate in circulation, reducing temperature dead zones.

[0094] The second and third ventilation holes can be designed as rectangular strips. Alternatively, they can be circular, elliptical, or polygonal. Rectangular strips allow for a larger total opening area within a limited space and facilitate arrangement along the width or height of the partition, promoting uniform airflow distribution while balancing airflow organization and structural strength.

[0095] Optionally, combined Figure 5 and Figure 6 As shown, the first air inlet 22 is located at the upper part of the refrigerator liner 21, and the first air outlet 23 is located at the lower part of the refrigerator liner 21; the fan 50 is located at the first air inlet 22; the second air outlet 82 is located at the upper part of the partition 80, and is used to introduce the airflow cooled by the first cold storage element 40 into the second air duct 312; the second air inlet 81 is located at the lower part of the partition 80, and is used to guide the return airflow flowing out of the refrigerator compartment 20 into the first air duct 311.

[0096] Up and down directions, such as Figure 4As indicated by the middle arrow. By placing the first air inlet 22 and fan 50 on the upper part of the refrigerator liner 21, the first air outlet 23 on the lower part, and the second air outlet 82 on the upper part of the partition 80 and the second air inlet 81 on the lower part of the partition 80, an efficient and stable airflow circulation path with top air supply and bottom air return can be constructed. The airflow direction is as follows. Figure 5 The direction indicated by the middle arrow.

[0097] Because the air cooled by the first cold storage element 40 has a low temperature and high density, it tends to sink naturally. Meanwhile, the return airflow in the cold storage compartment 20 has a relatively high temperature and low density, tending to rise. Therefore, the second air outlet 82 is positioned above the partition 80. This allows the low-temperature air cooled by the first cold storage element 40 to enter the second air duct 312 horizontally from the second air outlet 82 above the partition 80. There, it fully converges and mixes with the warmer return airflow rising from the bottom of the cold storage compartment 20 in the upper part of the second air duct 312, forming a uniformly heated mixed airflow. This mixed airflow is then drawn in by the fan 50 located at the top of the cold storage compartment 20 and sent to the top of the cold storage compartment 20. After entering the cold storage compartment 20, the mixed airflow flows from top to bottom, uniformly cooling the stored items. After heat exchange, the return airflow finally flows out from the first air outlet 23 located at the bottom of the refrigerator liner 21, and returns to the first air duct 311 via the second air inlet 81 at the bottom of the partition 80, where it flows again through the first cold storage element 40 for cooling, thus completing a complete airflow cycle. This fully utilizes the density difference between hot and cold air and the synergistic effect of the forced drive of the single fan 50, simplifying the structure while achieving a short airflow path, uniform mixing, and no direct blowing effect, effectively avoiding localized overcooling and effectively improving the temperature uniformity and antifreeze safety of the refrigerator compartment 20.

[0098] Optionally, combined Figures 4 to 6 As shown, the position of the first air inlet 22 corresponds to the position of the second air outlet 82, and the position of the first air outlet 23 corresponds to the position of the second air inlet 81.

[0099] This positional correspondence allows the cooled air to efficiently enter the first air inlet 22 after flowing out from the second air outlet 82, while the return airflow of the refrigerator compartment 20 can flow smoothly from the first air outlet 23 to the second air inlet 81, thereby shortening the airflow path, reducing flow resistance, and reducing the generation of eddies or dead zones, thus improving circulation efficiency and temperature uniformity.

[0100] Optionally, combined Figure 7As shown, the refrigeration equipment also includes a compressor 90, a condenser 91, a cold storage solenoid valve 92, a cold storage capillary tube 93, a refrigeration solenoid valve 94, a refrigeration capillary tube 95, and a refrigeration evaporator 96. The exhaust port of the compressor 90 is connected to the inlet of the condenser 91. The outlet of the condenser 91 is connected to the inlet of the cold storage solenoid valve 92 and the inlet of the refrigeration solenoid valve 94. The cold storage solenoid valve 92, the cold storage capillary tube 93, and the cold storage evaporator 60 are connected in series to form a cold storage branch 101, and the cold storage evaporator 60 is used to cool the first cold storage element 40. The refrigeration solenoid valve 94, the refrigeration capillary tube 95, and the refrigeration evaporator 96 are connected in series to form a refrigeration branch 102, and the refrigeration evaporator 96 is used to cool the freezer compartment 10. The outlet of the cold storage evaporator 60 and the outlet of the refrigeration evaporator 96 are combined and then connected to the suction port of the compressor 90.

[0101] like Figure 7 As shown, the refrigeration system of the refrigeration equipment includes a cold storage branch 101 and a refrigeration branch 102. The cold storage branch 101 is dedicated to cooling the first cold storage element 40, and the refrigeration branch 102 is dedicated to cooling the freezer chamber 10, forming a dual-branch parallel refrigeration system. The refrigerant flow direction is as follows: Figure 7 As indicated by the middle arrow. The on / off states of the cold storage branch 101 and the refrigeration branch 102 are independently controlled by the cold storage solenoid valve 92 and the refrigeration solenoid valve 94, respectively, enabling on-demand cooling. For example, during off-peak hours at night, only the cold storage branch 101 can be activated, efficiently storing the cold energy in the first cold storage unit 40; during peak daytime power shortages, the compressor 90 is turned off, relying on the cold storage unit to maintain the temperature of the refrigerator compartment 20. The cold energy of the first cold storage unit 40 can also provide cooling for the freezer compartment 10 to some extent. This strategy of prioritizing cold storage and allocating cooling on demand not only reduces operating costs but also avoids temperature fluctuations caused by frequent start-stop of the compressor 90 in traditional single-evaporator systems, improving temperature control stability.

[0102] In addition, the cold storage branch 101 and the refrigeration branch 102 share the compressor 90 and condenser 91, and the flow path is controlled separately only through solenoid valves and capillary tubes. This can achieve functional decoupling and independent control without significantly increasing the complexity of the system. This can reduce manufacturing costs and avoid the space occupation and reliability risks caused by adding a second set of compression and condensation units.

[0103] Optionally, combined Figure 7 As shown, the refrigeration equipment also includes a liquid storage tank 97, which is located on the suction port side of the compressor 90. After the outlet of the cold storage evaporator 60 and the outlet of the refrigeration evaporator 96 merge, they are connected to the suction port of the compressor 90 through the liquid storage tank 97.

[0104] The receiver 97 is used to temporarily store incompletely evaporated liquid refrigerant. It buffers return gas fluctuations caused by switching between two branches and provides additional evaporation space during transient system conditions, thus preventing liquid refrigerant from directly entering the compressor 90 and improving operational reliability. The receiver 97 is a low-pressure receiver. The low-pressure receiver combines gas-liquid separation and low-pressure liquid storage functions. Its volume can be designed according to the refrigerant flow rate of the maximum branch, ensuring that the compressor 90's suction is always in a safe superheated state during either branch operation or switching.

[0105] Optionally, combined Figure 2 As shown, the freezer inner liner 11 also includes a second freezer side plate 112, and a freezer evaporator 96 is disposed on the outer surface of the second freezer side plate 112 for cooling the freezer chamber 10; wherein, the second freezer side plate 112 is any other side plate of the freezer inner liner 11 other than the first freezer side plate 111.

[0106] The evaporator 96 is disposed on the outer surface of the second refrigeration side plate 112, which can independently refrigerate the freezer chamber 10 and effectively isolate the refrigeration circuit from the heat exchange chamber 31 and the first cold storage element 40 in space, thereby independently and accurately refrigerating the freezer chamber 10. When the first refrigeration side plate 111 is the left side plate of the freezer inner liner 11, the second refrigeration side plate 112 includes one or more of a rear side plate, a right side plate, and a front side plate. The rear side plate, the right side plate, and the front side plate are sequentially connected in the structure of the cabinet 30 to form three continuous outer walls of the inner liner of the freezer chamber 10.

[0107] Optionally, combined Figure 2 As shown, the refrigeration evaporator 96 is a serpentine tube evaporator.

[0108] The serpentine tube evaporator is composed of a continuously bent metal tube without fins, has a smooth surface, is easy to clean, and is not prone to frost buildup. For example, the serpentine tube evaporator is fitted to the outer surfaces of the rear, right, and front side panels of the inner liner of the freezer compartment 10, forming a cooling structure distributed along three continuous outer walls. This effectively improves the temperature uniformity within the freezer compartment 10 and reduces the formation of localized overcooling or hot spots.

[0109] Optionally, the refrigeration equipment further includes a first temperature sensor, a second temperature sensor, and a controller. The first temperature sensor is located in the first cold storage element 40 and is used to detect the cold storage temperature of the first cold storage element 40. The second temperature sensor is located in the freezer compartment 10 and is used to detect the freezing temperature of the freezer compartment 10. The controller is connected to the first temperature sensor, the second temperature sensor, the compressor 90, the cold storage solenoid valve 92, and the freezing solenoid valve 94. The controller is configured to start the compressor when the freezing temperature is greater than the preset freezing temperature value and the cold storage temperature is greater than the preset cold storage temperature value. 90. Cold storage solenoid valve 92 and refrigeration solenoid valve 94; When the freezing temperature is less than or equal to the preset freezing temperature value and the cold storage temperature is greater than the preset cold storage temperature value, compressor 90 and cold storage solenoid valve 92 are turned on, and refrigeration solenoid valve 94 is turned off; When the freezing temperature is greater than the preset freezing temperature value and the cold storage temperature is less than or equal to the preset cold storage temperature value, compressor 90 and refrigeration solenoid valve 94 are turned on, and cold storage solenoid valve 92 is turned off; When the freezing temperature is less than or equal to the preset freezing temperature value and the cold storage temperature is less than or equal to the preset cold storage temperature value, compressor 90 is turned off.

[0110] By setting a first temperature sensor, a second temperature sensor, and a controller, and dynamically adjusting the on / off states of the cold storage solenoid valve 92 and the refrigeration solenoid valve 94 based on the cold storage temperature of the first cold storage element 40 and the freezing temperature of the freezer compartment 10, the refrigeration system can achieve on-demand cooling and intelligent flow distribution. When both the freezer compartment 10 and the first cold storage element 40 need cooling, both branches are opened simultaneously to achieve rapid cooling. When only the first cold storage element 40 has not reached its cold storage target, the refrigeration solenoid valve 94 is closed to prevent overcooling caused by continuing to supply cooling to the freezer compartment 10, which has already reached the target. When only the temperature of the freezer compartment 10 is too high, the cold storage solenoid valve 92 is closed, concentrating all cooling capacity on cooling the freezer compartment 10, improving response speed and energy efficiency. This effectively prevents temperature overshoot or fluctuations while ensuring refrigeration performance. For example, under disturbance conditions such as vaccine transportation or frequent door opening, the system can quickly identify the temperature rise in the freezer compartment 10 and prioritize the activation of the refrigeration branch 102 to ensure temperature stability in critical areas.

[0111] When the freezing temperature is greater than the preset freezing temperature and the cold storage temperature is greater than the preset cold storage temperature, the controller starts the compressor 90, the refrigeration system works, the refrigerant flows out from the compressor 90, and becomes a refrigerant liquid after being cooled by the condenser 91. The controller opens the cold storage solenoid valve 92 and the refrigeration solenoid valve 94, and the refrigerant is split into the cold storage branch 101 and the refrigeration branch 102, and enters the refrigeration evaporator 96 and the cold storage evaporator 60 respectively for evaporation, and cools down the freezing chamber 10 and the first cold storage element 40 respectively.

[0112] Optionally, depending on the flow rate of the cold storage capillary 93 and the refrigeration capillary 95, different refrigerant charges flow through the refrigeration capillary 95 and the cold storage capillary 93 respectively for throttling.

[0113] The inner diameter and / or length of the cold storage capillary tube 93 and the refrigeration capillary tube 95 are different to set different flow cross-sectional areas and flow resistances. Based on the refrigeration load requirements of the two branches, the system matches the flow characteristics of the cold storage capillary tube 93 and the refrigeration capillary tube 95 during the design phase, so that when the compressor 90 is running, the refrigerant flows through the refrigeration capillary tube 95 and the cold storage capillary tube 93 respectively for throttling in a preset ratio. When the cold storage solenoid valve 92 and the refrigeration solenoid valve 94 are opened simultaneously, the refrigerant is automatically distributed as needed due to the difference in throttling capacity between the two capillaries.

[0114] For example, when the heat load of the freezer compartment 10 is high and the cold storage demand is low, the refrigeration capillary 95 can be configured with a larger diameter or a shorter length to provide a greater refrigerant flow rate. Conversely, if a large amount of cold storage needs to be completed in a short time, such as using off-peak electricity at night for rapid cold storage, the cold storage capillary 93 can be designed with a larger diameter to obtain a higher flow rate when turned on, thereby accelerating the freezing process of the phase change material. By differentiating the throttling parameters of the cold storage capillary 93 and the refrigeration capillary 95, the system can achieve adaptive refrigerant distribution without additional flow regulation devices when both branches are turned on simultaneously, ensuring that each branch receives a refrigerant flow rate that matches its evaporation temperature and heat load. This not only simplifies the system structure but also improves heat exchange efficiency.

[0115] When the freezing temperature is less than or equal to the preset freezing temperature and the cold storage temperature is greater than the preset cold storage temperature, the controller starts the compressor 90, the refrigeration system works, the refrigerant flows out from the compressor 90, and becomes a liquid refrigerant after being cooled by the condenser 91. The cold storage solenoid valve 92 opens and the freezing solenoid valve 94 closes, the refrigerant enters the cold storage capillary tube 93 for throttling, and evaporates in the cold storage evaporator 60, exchanging heat with the first cold storage element 40, thereby storing the cold energy in the first cold storage element 40.

[0116] When the freezing temperature is greater than the preset freezing temperature and the cold storage temperature is less than or equal to the preset cold storage temperature, the controller starts the compressor 90, the refrigeration system works, the refrigerant flows out from the compressor 90, and becomes liquid refrigerant after being cooled by the condenser 91. The cold storage solenoid valve 92 closes and the freezing solenoid valve 94 opens, the refrigerant enters the freezing capillary tube 95 for throttling, evaporates in the freezing evaporator 96, and exchanges heat with the freezing chamber 10, thereby reducing the freezing temperature.

[0117] When the freezing temperature is less than or equal to the preset freezing temperature and the cold storage temperature is less than or equal to the preset cold storage temperature, the controller shuts down the compressor 90, and the refrigeration system is shut down.

[0118] Optionally, the refrigeration equipment also includes a third temperature sensor, which is located in the refrigerator compartment 20 and used to detect the refrigeration temperature of the refrigerator compartment 20. The controller is connected to both the third temperature sensor and the fan 50, and is configured to: control the fan 50 to operate at a first speed when the refrigeration temperature is greater than a first temperature threshold; control the fan 50 to operate at a second speed when the refrigeration temperature is less than or equal to the first temperature threshold and greater than a second temperature threshold; and control the fan 50 to stop operating or operate at a minimum safe speed when the refrigeration temperature is less than or equal to the second temperature threshold. The first temperature threshold is greater than the second temperature threshold, the first speed is greater than the second speed, and the second speed is greater than the minimum safe speed.

[0119] When the refrigeration temperature is greater than the second temperature threshold, the controller controls the fan 50 to start working. The airflow is from the heat exchange chamber 31 through the first air inlet 22 to the refrigeration chamber 20, and then returns to the heat exchange chamber 31 through the first air outlet 23, thus forming an air circulation.

[0120] When the refrigeration temperature exceeds the first temperature threshold, it indicates that there is a significant temperature rise or increased heat load in the refrigeration compartment 20, such as when the door is opened or the ambient temperature is high. The controller starts the fan 50 to run at a higher first speed, accelerating the mixed airflow cooled by the first cold storage element 40 and sending it into the refrigeration compartment 20. This quickly responds to the temperature rise caused by opening the door or environmental disturbance, achieving rapid cooling and shortening the temperature recovery time.

[0121] When the refrigeration temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, it indicates that the temperature inside the refrigeration compartment 20 is within the target storage range (e.g., 2 ℃~8 ℃) but has not yet stabilized. The fan 50 is controlled to run at a lower second speed to maintain a gentle airflow circulation, ensuring the temperature uniformity inside the refrigeration compartment 20 while avoiding overcooling and reducing energy consumption.

[0122] When the refrigeration temperature is less than or equal to the second temperature threshold, the temperature inside the refrigeration compartment 20 may be close to or reach the set lower limit (e.g., ≤3 ℃). In non-medical applications or applications with low antifreeze requirements, the control fan 50 stops running, cutting off forced air supply to prevent the continuous input of low-temperature airflow from causing cold energy to accumulate at the bottom or near the inner wall, thereby avoiding further temperature drop in local areas.

[0123] The minimum safe operating speed refers to the minimum fan speed at which the vertical temperature difference within the refrigerated compartment is less than or equal to 1.0 ℃, typically 15% to 25% of the rated speed.

[0124] When the refrigeration temperature is less than or equal to the second temperature threshold, the temperature inside the cold storage compartment 20 can also be at a critical low temperature. In medical or high-safety-requirement applications, the fan 50 is controlled to operate at the lowest safe speed to maintain weak but continuous airflow circulation, ensuring thorough mixing of air inside the cold storage compartment 20, eliminating temperature dead zones, and preventing localized freezing due to insufficient natural convection, while also considering energy efficiency and vaccine storage safety. When the refrigeration temperature is less than or equal to the second temperature threshold, the fan 50 can be controlled to operate intermittently at the lowest safe speed, such as working for 30 seconds and stopping for 90 seconds.

[0125] Optionally, the first temperature threshold ranges from 7°C to 8°C; the second temperature threshold ranges from 3°C to 4°C.

[0126] The World Health Organization has set a storage temperature range of 2°C to 8°C for temperature-sensitive medical supplies such as vaccines and biological products, which is the target temperature range that the cold storage compartment 20 needs to maintain. By setting the first temperature threshold within the range of 7°C to 8°C, high-speed airflow can be activated in time when the temperature of the cold storage compartment 20 approaches the upper limit (8°C), effectively dealing with disturbances such as door opening and high ambient temperature, and avoiding thermal damage to vaccines caused by exceeding the temperature limit. At the same time, setting the second temperature threshold within the range of 3°C to 4°C is significantly higher than the lower limit of the target range by 2°C and far higher than the freezing critical point of 0°C. This allows the fan speed of 50 to be reduced in advance, switched to micro-circulation mode, or the forced airflow to be stopped before the temperature of the cold storage compartment 20 drops to the lower limit of the target range. This prevents the temperature in some areas of the cold storage compartment 20 from dropping below 0°C due to the continuous release of cold from the first cold storage element 40 or the sinking of cold air, thereby fundamentally avoiding the risk of freezing of biological products.

[0127] Optionally, the first temperature threshold is 8 ℃ and the second temperature threshold is 3 ℃.

[0128] 8℃ is designated as the high-temperature intervention point, consistent with the upper limit of refrigeration temperature stipulated by the World Health Organization (WHO). This allows for timely activation of the 50 rpm high-speed fan before the temperature approaches the limit, quickly responding to disturbances such as door opening and ambient temperature rise. 3℃ is designated as the low-temperature intervention point, providing a 1℃ safety margin relative to the lower limit of refrigeration temperature stipulated by the WHO (2℃). This effectively compensates for sensor measurement errors, uneven airflow distribution within the refrigeration compartment 20, and the temperature hysteresis effect caused by the inertia of the first cold storage element 40 releasing cold. Actual measurements show that this control strategy ensures that the cumulative time the temperature at any location within the refrigeration compartment 20 is below 0℃ does not exceed 1 hour, and that the instantaneous temperature at any moment does not fall below -0.5℃, meeting the WHO's requirements for the antifreeze performance of Class A vaccine refrigeration equipment.

[0129] Optionally, the refrigerator compartment 20 is also equipped with one or more fourth temperature sensors. The fourth temperature sensors are located in areas where low temperatures are prone to accumulate, and are used to monitor the local extreme temperatures in the refrigerator compartment 20 in real time. The controller is also connected to the fourth temperature sensors and is configured to control the fan 50 to increase to the second speed when the temperature detected by any of the fourth temperature sensors is less than or equal to 0 °C.

[0130] Areas prone to low-temperature accumulation may be the bottom corners of the refrigerator compartment 20 or the inner surface of the first refrigerator side panel 211. The fourth temperature sensor serves as a low-temperature monitoring point sensor. Controlling the fan 50 to operate at its second speed can enhance airflow circulation within the refrigerator, accelerate the diffusion of cold air, and prevent low-temperature air from continuously accumulating in localized areas.

[0131] Furthermore, the phase change temperature of the second cold storage element 70 is set within the range of 0 ℃ to 4 ℃, serving as a thermal buffer layer. It absorbs or releases latent heat when the compressor 90 stops or during environmental disturbances, effectively mitigating temperature fluctuations in the refrigerator compartment 20. A high-barrier thermal partition 80 is provided between the refrigerator compartment 20 and the freezer compartment 10. The outer surface of the inner liner of the refrigerator compartment 20 is covered with a low thermal conductivity insulation layer 32, which effectively reduces cold crosstalk between the freezer and refrigerator compartments 20.

[0132] Optionally, the controller is also configured to: when the refrigeration temperature is less than or equal to the second temperature threshold, if the cold storage temperature of the first cold storage element 40 is lower than the phase change temperature of the first phase change material, control the fan 50 to operate at the second speed; if the cold storage temperature of the first cold storage element 40 is greater than or equal to the phase change temperature of the first phase change material, control the fan 50 to operate at the minimum safe speed.

[0133] In this scenario, the second rotational speed specifically refers to the enhanced circulation speed used to accelerate the diffusion of cold energy on the surface of the cold storage component. This second rotational speed is greater than the minimum safe rotational speed but less than the speed under high-temperature conditions. By incorporating the phase change state of the cold storage material into the control decision of the fan 50, precise adaptation to the airflow strategy under low-temperature conditions in the cold storage chamber 20 can be achieved. The first cold storage component 40 is filled with a first phase change material. When the cold storage temperature of the first cold storage component 40 is lower than the phase change temperature of the first phase change material, the first phase change material is in a cryogenic solid state. At this time, increasing the rotational speed of the fan 50 can enhance convective heat transfer, accelerate the diffusion of cold energy into the cold storage chamber 20, and effectively prevent cold energy accumulation. When the cold storage temperature of the first cold storage component 40 is higher than or equal to the phase change temperature of the first phase change material, and the first phase change material is in the phase change plateau period, the first phase change material itself has a strong thermal buffering capacity. Maintaining only the minimum safe rotational speed is sufficient to ensure temperature uniformity, avoiding disturbances and energy waste caused by excessive airflow.

[0134] Optionally, the refrigeration equipment also includes a backup battery electrically connected to the fan 50, and the controller is configured to periodically start and stop the fan 50 based on the refrigeration temperature detected by the third temperature sensor in the event of a power failure.

[0135] The refrigeration equipment is equipped with a backup battery of appropriate capacity. When the refrigeration equipment loses power, the first cold storage element 40 stores a certain amount of cold energy, and the fan 50 starts and stops according to the refrigeration temperature in the cold storage compartment 20, which can still ensure the stability of the temperature in the cold storage compartment 20.

[0136] Optionally, the controller is also configured to: after power is restored from a power outage, start the compressor 90 and prioritize the conduction of the cold storage branch 101, so that the refrigerant flows first through the first cold storage element 40 for cold storage; when the temperature of the first cold storage element 40 drops below the phase change temperature of the first phase change material and the preset cold storage completion condition is met, switch to normal cooling mode or start the corresponding branch according to the actual temperature requirements of the freezer compartment 10 and the refrigerator compartment 20.

[0137] By prioritizing the reconstruction of cold storage capacity during the initial power restoration phase, temperature stability and safety under extreme conditions can be improved. Upon power-up, the controller first starts the compressor 90 and directs the refrigerant to the first cold storage unit 40, enabling it to quickly complete phase change cold storage and thus re-establish a reliable cold capacity buffer. During this period, the freezer compartment 10 and refrigerator compartment 20 are not directly cooled, effectively preventing overheating, localized freezing, or drastic temperature fluctuations caused by the first cold storage unit 40 not yet being ready. Once the temperature of the first cold storage unit 40 stabilizes below the phase change temperature and meets the preset cold storage completion conditions (e.g., maintaining a low temperature for 10 minutes), the controller dynamically allocates cooling capacity based on the actual temperature difference between the freezer compartment 10 and refrigerator compartment 20, switching to the normal multi-branch coordinated operation mode.

[0138] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A refrigeration device, characterized in that, include: The freezer compartment is equipped with a freezer inner liner; The refrigerator compartment is equipped with a refrigerator inner liner, which is separated from the freezer inner liner. A heat exchange chamber is constructed between the refrigerator inner liner and the freezer inner liner. The refrigerator inner liner is equipped with a first air inlet and a first air outlet that are connected to the heat exchange chamber. The first cold storage element is located inside the heat exchange chamber and is situated on the side closest to the freezer compartment. A fan, located in the cold storage compartment, is configured to drive the air in the heat exchange chamber to enter the cold storage compartment through the first air inlet and then return to the heat exchange chamber through the first air outlet, forming an airflow circulation.

2. The refrigeration equipment according to claim 1, characterized in that, The freezer liner includes a first freezer side panel near the refrigerator compartment, and the refrigeration unit also includes: A cold storage evaporator is located on the outer surface of the first refrigeration side plate, and a first cold storage component is attached to the cold storage evaporator.

3. The refrigeration equipment according to claim 1, characterized in that, The refrigerator liner includes a first refrigerator side panel near the freezer compartment, a first air inlet and a first air outlet are located on the first refrigerator side panel, and the refrigeration equipment also includes: The second cold storage element is located on the outer surface of the first cold storage side plate and is used to buffer the cold energy transferred from the heat exchange chamber to the cold storage compartment.

4. The refrigeration equipment according to claim 3, characterized in that, The first cold storage element is filled with a first phase change material, the phase change temperature of which is greater than -10 ℃ and less than or equal to -7 ℃; and / or, The second cold storage component is filled with a second phase change material, the phase change temperature of which is greater than or equal to 0 ℃ and less than or equal to 4 ℃.

5. The refrigeration equipment according to claim 1, characterized in that, Also includes: A partition is provided in the heat exchange chamber to divide the heat exchange chamber into a first air duct near the freezer compartment and a second air duct near the refrigerator compartment; The first cold storage component is located in the first air duct; the partition is provided with a second air inlet and a second air outlet. The air cooled by the first cold storage component enters the second air duct through the second air outlet from the first air duct, and the air sent out from the cold storage compartment flows into the first air duct through the second air inlet from the second air duct.

6. The refrigeration equipment according to claim 5, characterized in that, The first air inlet is located at the top of the refrigerator liner, and the first air outlet is located at the bottom of the refrigerator liner. The fan is located at the first air inlet; The second air outlet is located at the top of the partition and is used to introduce the airflow cooled by the first cold storage component into the second air duct. The second air inlet is located at the bottom of the partition and is used to guide the return airflow from the refrigerator compartment into the first air duct.

7. The refrigeration equipment according to any one of claims 2 to 6, characterized in that, Also includes: Compressor, condenser, cold storage solenoid valve, cold storage capillary tube, refrigeration solenoid valve, refrigeration capillary tube, and refrigeration evaporator. The compressor's discharge port is connected to the condenser's inlet; The outlet of the condenser is connected to the inlet of the cold storage solenoid valve and the inlet of the refrigeration solenoid valve, respectively. The cold storage solenoid valve, the cold storage capillary tube, and the cold storage evaporator are connected in series to form a cold storage branch, and the cold storage evaporator is used to cool the first cold storage element. The refrigeration solenoid valve, refrigeration capillary tube, and refrigeration evaporator are connected in series to form a refrigeration branch, and the refrigeration evaporator is used to cool the refrigeration compartment. The outlet of the cold storage evaporator and the outlet of the refrigeration evaporator are connected to the suction port of the compressor.

8. The refrigeration equipment according to claim 7, characterized in that, Also includes: A first temperature sensor is installed on the first cold storage element and is used to detect the cold storage temperature of the first cold storage element. The second temperature sensor is located in the freezer compartment and is used to detect the freezing temperature of the freezer compartment; The controller is connected to the first temperature sensor, the second temperature sensor, the compressor, the cold storage solenoid valve, and the refrigeration solenoid valve. The controller is configured as follows: When the freezing temperature is greater than the preset freezing temperature and the cold storage temperature is greater than the preset cold storage temperature, the compressor, cold storage solenoid valve and freezing solenoid valve are turned on. When the freezing temperature is less than or equal to the preset freezing temperature and the cold storage temperature is greater than the preset cold storage temperature, the compressor and the cold storage solenoid valve are turned on, and the freezing solenoid valve is turned off. When the freezing temperature is greater than the preset freezing temperature and the cold storage temperature is less than or equal to the preset cold storage temperature, the compressor and the freezing solenoid valve are turned on, and the cold storage solenoid valve is turned off. When the freezing temperature is less than or equal to the preset freezing temperature and the cold storage temperature is less than or equal to the preset cold storage temperature, the compressor is turned off.

9. The refrigeration equipment according to claim 8, characterized in that, Also includes: The third temperature sensor is located in the refrigerator compartment and is used to detect the refrigerator temperature. The controller is connected to both the third temperature sensor and the fan, and is configured as follows: When the refrigeration temperature is greater than the first temperature threshold, the fan is controlled to run at the first speed. When the refrigeration temperature is less than or equal to the first temperature threshold and greater than the second temperature threshold, the fan is controlled to run at the second speed. When the refrigeration temperature is less than or equal to the second temperature threshold, the control fan stops running or runs at the lowest safe speed. Among them, the first temperature threshold is greater than the second temperature threshold, the first rotation speed is greater than the second rotation speed, and the second rotation speed is greater than the minimum safe rotation speed.

10. The refrigeration equipment according to claim 9, characterized in that, Also includes: The backup battery is electrically connected to the wind turbine, and the controller is configured as follows: In the event of a power outage, the fan is periodically started and stopped based on the refrigeration temperature detected by the third temperature sensor.

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