Energy-saving refrigerator based on mixed refrigeration of direct cooling and air cooling

Abstract

The utility model belongs to refrigerator technical field discloses a kind of energy-saving refrigerator based on direct cooling and air cooling mixed refrigeration, including cabinet, the refrigeration system being arranged in cabinet and the partition that the inner cavity of cabinet is divided into freezing chamber and refrigeration chamber, the refrigeration system includes the refrigeration cycle loop being connected by compressor, condenser, throttling mechanism and evaporator by pipeline, further include evaporator bin, the evaporator is the finned evaporator being arranged in freezing chamber rear portion, finned evaporator is installed in the inside of evaporator bin, and opening is equipped in evaporator bin with refrigeration chamber intercommunication.The utility model can concentrate refrigeration by the finned evaporator being equipped, first fan is inhaled into freezing chamber in evaporator bin cold air, and a large number of low temperature, dry air is sent into freezing chamber at high speed, realize quick cooling and frostless, direct cooling type evaporator plate directly absorbs refrigeration chamber inner wall heat, realize windless static cooling, save the moisture of fruit and vegetable etc. Food, avoid air drying.

Description

Technical Field

[0001] This utility model relates to the field of freezer technology, and in particular to an energy-saving freezer based on a hybrid refrigeration system of direct cooling and air cooling. Background Technology

[0002] Freezers, as common refrigeration equipment, are widely used in homes, supermarkets, and cold chain storage. Traditional freezer refrigeration methods are mainly divided into two types: direct cooling and air cooling. Direct cooling freezers exchange heat directly with the inner liner through the evaporator. They are simple in structure and low in cost, but are prone to frost buildup, requiring regular defrosting, and have poor temperature uniformity. Air-cooled freezers use a fan to blow cold air generated by the evaporator into the freezer, achieving frost-free operation and rapid cooling. However, continuous airflow can cause food to dry out, making them particularly unsuitable for fruits, vegetables, and other foods that require moisture.

[0003] Existing technologies have attempted to combine direct cooling with air cooling, but these solutions often suffer from problems such as unreasonable cooling capacity distribution, inaccurate control systems, and high energy consumption. For example, some hybrid refrigeration freezers still exhibit issues such as strong coupling between the refrigerator and freezer compartments, rudimentary auxiliary air cooling control, and low cooling capacity utilization. Utility Model Content

[0004] To overcome the technical defects of the existing technology, this utility model provides an energy-saving freezer based on a hybrid refrigeration system of direct cooling and air cooling.

[0005] The technical solution adopted by this utility model is: an energy-saving freezer based on a hybrid refrigeration system of direct cooling and air cooling, including a cabinet, a refrigeration system installed inside the cabinet, and a partition dividing the internal cavity of the cabinet into a freezer compartment and a refrigerator compartment. The refrigeration system includes a refrigeration cycle loop consisting of a compressor, a condenser, a throttling mechanism, and an evaporator connected by pipes, and also includes an evaporator compartment. The evaporator is a finned evaporator installed at the rear of the freezer compartment, and the finned evaporator is installed inside the evaporator compartment. The evaporator compartment has an opening communicating with the freezer compartment, and a first fan is installed at the opening of the evaporator compartment facing the freezer compartment. The first fan is used to blow cold air from the evaporator compartment into the freezer compartment, forming a cold air circulation in the freezer compartment; at least one inner wall of the refrigerator compartment is equipped with a direct-cooling evaporator plate, and the cabinet is embedded with an inlet pipe connecting the direct-cooling evaporator plate and the refrigeration circulation loop, with a solenoid valve on the inlet pipe; a second fan is installed on the top of the evaporator compartment, and the second fan is connected to the refrigerator compartment through an air duct, and is used to draw in low-temperature air from the evaporator compartment and deliver it to the refrigerator compartment; a PLC controller is installed on the cabinet, and the first fan, the second fan, the solenoid valve, and the compressor are respectively connected to the PLC controller.

[0006] Preferably, the outlet end of the air duct is equipped with an adjustable air volume regulating valve, which is communicatively connected to the PLC controller.

[0007] Preferably, the second fan is a centrifugal fan.

[0008] Preferably, the direct-cooling evaporator plate is located on the side wall of the cold storage compartment.

[0009] Preferably, when the freezer compartment needs to be cooled, the PLC controller starts the compressor and the first fan, and keeps the solenoid valve closed.

[0010] Preferably, when the refrigerator compartment needs to be cooled, the PLC controller starts the compressor and opens the solenoid valve; when the temperature of the refrigerator compartment still does not meet the set temperature requirement after cooling, the PLC controller starts the second fan for auxiliary cooling.

[0011] The beneficial effects of this utility model are as follows: Centralized cooling is achieved through the finned evaporator. The first fan blows cold air from the evaporator compartment into the freezer compartment, delivering a large amount of low-temperature, dry air at high speed to achieve rapid cooling and frost-free operation. The direct-cooling evaporator plate directly absorbs heat from the inner wall of the refrigerator compartment, achieving windless, quiet cooling and preserving the moisture of fruits, vegetables, and other foods, preventing them from drying out. The second fan extracts the remaining low-temperature air from the evaporator compartment that has not yet been utilized by the first fan and sends it into the refrigerator compartment through the ductwork, fully utilizing the cooling capacity of the finned evaporator. The first fan utilizes the finned... The main cooling capacity of the evaporator is utilized by the second fan, which takes advantage of the residual cooling capacity of the finned evaporator. This achieves tiered utilization of cooling capacity, reduces waste, and makes the freezer highly energy-efficient. The refrigerator compartment mainly uses a direct-cooling evaporator plate, which fundamentally solves the problem of air drying and provides good humidification. When rapid cooling is needed, the second fan works to quickly lower the temperature, making the temperature control of the refrigerator compartment more precise and the response faster. The cooling of the freezer and refrigerator compartments is relatively independent, and the cooling demand of the refrigerator compartment no longer completely depends on and affects the operating conditions of the freezer compartment, thus solving the coupling interference problem of traditional air cooling. Attached Figure Description

[0012] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0013] Figure 1 This is a cross-sectional view of the overall structure of this utility model.

[0014] Explanation of reference numerals in the attached diagram: 1. Cabinet; 2. Freezer compartment; 3. Refrigerator compartment; 4. Partition; 5. Evaporator compartment; 6. Finned evaporator; 7. First fan; 8. Direct-cooling evaporator plate; 9. Second fan; 10. Air duct; 11. PLC controller; 12. Air volume regulating valve; 13. Refrigeration cycle loop; 14. Refrigeration system; 15. Opening; 16. Inlet pipe; 17. Solenoid valve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0016] like Figure 1As shown, this embodiment provides an energy-saving freezer based on a hybrid direct cooling and air cooling system, including a cabinet 1, a refrigeration system 14 installed inside the cabinet 1, and a partition 4 dividing the inner cavity of the cabinet 1 into a freezer compartment 2 and a refrigerator compartment 3. Temperature sensors are installed inside both the freezer compartment 2 and the refrigerator compartment 3. The refrigeration system 14 includes a refrigeration cycle loop 13 consisting of a compressor, a condenser, a throttling mechanism, and an evaporator connected by pipes, and also includes an evaporator compartment 5. The evaporator is a finned evaporator 6 installed at the rear of the freezer compartment 2, inside the evaporator compartment 5. The evaporator compartment 5 has an opening 15 communicating with the freezer compartment 2. A first fan 7 is installed at the opening 15 facing the freezer compartment 2, and the first fan 7 is used to blow cold air from the evaporator compartment 5 into the freezer compartment 2, forming an air-cooled circulation in the freezer compartment. At least one inner wall of the refrigerator compartment 3 is provided with a direct cooling evaporator plate 8. An inlet pipe 16 is embedded, connecting the direct-cooling evaporator plate 8 and the refrigeration cycle loop 13. An inlet pipe 16 is equipped with a solenoid valve 17. When the freezer compartment 2 needs cooling, the PLC controller 11 starts the compressor and the first fan 7, while keeping the solenoid valve 17 closed. When the refrigerator compartment 3 needs cooling, the PLC controller 11 starts the compressor and opens the solenoid valve 17. If the temperature of the refrigerator compartment 3 still does not meet the set temperature requirement after cooling, the PLC controller 11 starts the second fan 9 for auxiliary cooling. This ensures that in most cases, the refrigerator compartment 3 operates in the most energy-efficient and heat-preserving refrigeration mode, only starting auxiliary air cooling when necessary, achieving the best balance between performance and energy consumption. A second fan 9 is installed on the top of the evaporator compartment 5, and the second fan 9 is connected to the refrigerator compartment 3 through the air duct 10. The second fan 9 is used to draw in low-temperature air from the evaporator compartment 5 and deliver it to the refrigerator compartment 3.A PLC controller 11 is installed on the cabinet 1. The first fan 7, the second fan 9, the solenoid valve 17, and the compressor are all communicatively connected to the PLC controller 11. The temperature sensors in the freezer compartment 2 and the refrigerator compartment 3 are electrically connected to the PLC controller 11. Centralized cooling is achieved through the finned evaporator 6. The first fan 7 blows cold air from the evaporator compartment 5 into the freezer compartment 2, delivering a large amount of low-temperature, dry air at high speed to achieve rapid cooling and frost-free operation. The direct-cooling evaporator plate 8 directly absorbs heat from the inner wall of the refrigerator compartment 3, achieving windless and quiet cooling, preserving the moisture of fruits, vegetables, and other foods, and preventing them from drying out. The second fan 9 extracts the remaining low-temperature air from the evaporator compartment 5 that has not yet been utilized by the first fan 7 and then... Airflow duct 10 delivers cooling energy into refrigerator compartment 3, fully utilizing the cooling capacity of finned evaporator 6. The first fan 7 utilizes the main cooling capacity of finned evaporator 6, while the second fan 9 utilizes the residual cooling capacity, achieving tiered utilization of cooling capacity and reducing waste. This results in high energy efficiency for the freezer. Refrigerator compartment 3 primarily uses direct-cooling evaporator plates 8, fundamentally solving the problem of air drying and providing good moisture retention. When rapid cooling is needed, the second fan 9 operates, quickly lowering the temperature, making temperature control in refrigerator compartment 3 more precise and responsive. The cooling of freezer compartment 2 and refrigerator compartment 3 is relatively independent; the cooling demand of refrigerator compartment 3 no longer completely depends on or affects the operating conditions of freezer compartment 2, resolving the coupling interference problem inherent in traditional air-cooled systems.

[0017] The outlet end of the air duct 10 is equipped with an adjustable air volume regulating valve 12. The air volume regulating valve 12 is connected to the PLC controller 11. By changing the opening of the air volume regulating valve 12, the auxiliary cold air volume entering the refrigerator compartment 3 is precisely adjusted, realizing stepless control of the auxiliary air cooling intensity of the refrigerator compartment 3, avoiding over-cooling, and further improving the accuracy and energy efficiency of temperature control.

[0018] The second fan 9 is a centrifugal fan. Centrifugal fans have high air pressure, which is suitable for overcoming the resistance of the air duct to deliver air, ensuring that the cold air is delivered smoothly to the cold storage compartment 3 and improving reliability.

[0019] The direct-cooling evaporator plate 8 is installed on the side wall of the cold storage compartment 3. The side wall installation helps to increase the heat exchange area and improve the refrigeration efficiency, while avoiding the occupation of storage space and ensuring uniform temperature distribution in the cold storage compartment.

[0020] When the freezer compartment 2 needs to be cooled, the PLC controller 11 starts the compressor and the first fan 7, and keeps the solenoid valve 17 closed; when the refrigerator compartment 3 needs to be cooled, the PLC controller 11 starts the compressor and opens the solenoid valve 17; when the temperature of the refrigerator compartment 3 still does not meet the set temperature requirement after cooling, the PLC controller 11 starts the second fan 9 for auxiliary cooling, ensuring that in most cases, the refrigerator compartment 3 operates in the most energy-efficient and heat-preserving cooling mode, and only starts auxiliary air cooling when necessary, achieving the best balance between effect and energy consumption.

[0021] During operation, the refrigeration system 14 compresses, condenses, throttles, and evaporates the refrigerant through the refrigeration cycle loop 13. The finned evaporator 6 provides centralized cooling, generating a large amount of low-temperature air. The first fan 7 forces the cold air in the evaporator compartment 5 into the freezer compartment 2, achieving rapid cooling without frost. The refrigerator compartment 3 mainly uses the direct-cooling evaporator plate 8 for static cooling, directly absorbing heat from the wall surface to prevent food from drying out due to wind, making it especially suitable for moisturizing and storing fruits and vegetables. The second fan 9 introduces the residual cold air in the evaporator compartment 5 that was not used by the first fan 7 into the refrigerator compartment 3 through the air duct 10, so as to realize the cascade utilization of the cooling capacity. The air volume regulating valve 12 can adjust the auxiliary air volume according to the actual temperature requirements of the refrigerator compartment 3 to avoid over-cooling and further improve energy efficiency and temperature control accuracy. The PLC controller 11 monitors the temperatures of the freezer compartment 2 and the refrigerator compartment 3 in real time using temperature sensors installed in the freezer compartment 2 and the refrigerator compartment 3. It independently controls the operating status of the compressor, the first fan 7, the second fan 9, the solenoid valve 17, and the direct-cooling evaporator plate 8. Through the independent control of the solenoid valve 17, the refrigeration cycles of the freezer compartment 2 and the refrigerator compartment 3 can be made relatively independent. When only the freezer compartment 2 needs cooling, the solenoid valve 17 is closed, and the refrigerant does not flow to the direct-cooling evaporator plate 8, avoiding unnecessary cooling of the refrigerator compartment 3 and resulting in significant energy savings. When the refrigerator compartment 3 needs cooling, the solenoid valve 17 is closed, preventing refrigerant from flowing to the direct-cooling evaporator plate 8, thus avoiding unnecessary cooling of the refrigerator compartment 3 and achieving significant energy savings. When the solenoid valve 17 is opened, the refrigerant flows through the direct-cooling evaporator plate 8 for direct cooling. If the temperature still does not reach the set value, the second fan 9 is activated to introduce auxiliary air cooling, which not only ensures moisture retention but also improves the cooling speed and temperature control accuracy. Through the PLC controller 11, the operation of the solenoid valve 17, the first fan 7, the second fan 9 and the compressor are coordinated to realize the efficient hybrid cooling mode of the refrigerator compartment 3, which is mainly direct cooling and supplemented by air cooling. This fundamentally solves the problems of traditional air-cooled cabinets being prone to drying out and direct-cooled cabinets being slow to cool down. At the same time, it significantly reduces energy consumption and has good practicality and energy saving.

[0022] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0023] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. An energy-saving freezer based on a hybrid direct cooling and air cooling system, comprising a cabinet (1), a refrigeration system (14) disposed within the cabinet (1), and a partition (4) dividing the interior of the cabinet (1) into a freezer compartment (2) and a refrigerator compartment (3), wherein the refrigeration system (14) comprises a refrigeration loop (13) consisting of a compressor, a condenser, a throttling mechanism, and an evaporator connected by pipes, characterized in that: It also includes an evaporator compartment (5), wherein the evaporator is a finned evaporator (6) located at the rear of the freezer compartment (2). The finned evaporator (6) is installed inside the evaporator compartment (5). The evaporator compartment (5) is provided with an opening (15) that communicates with the freezer compartment (2). A first fan (7) is provided at the opening (15) of the evaporator compartment (5) facing the freezer compartment (2). The first fan (7) is used to blow the cold air in the evaporator compartment (5) into the freezer compartment (2) to form a freezer compartment air-cooled circulation. At least one inner wall of the cold storage compartment (3) is provided with a direct cooling evaporator plate (8), and the cabinet (1) is embedded with an inlet pipe (16) that connects the direct cooling evaporator plate (8) and the refrigeration cycle circuit (13). A solenoid valve (17) is provided on the inlet pipe (16). A second fan (9) is installed on the top of the evaporator compartment (5). The second fan (9) is connected to the cold storage compartment (3) through the air duct (10). The second fan (9) is used to draw in the low-temperature air in the evaporator compartment (5) and deliver it to the cold storage compartment (3). The cabinet (1) is equipped with a PLC controller (11), and the first fan (7), the second fan (9), the solenoid valve (17) and the compressor are respectively connected to the PLC controller (11) for communication.

2. An energy-saving freezer based on a hybrid direct cooling and air cooling system according to claim 1, characterized in that: The outlet end of the air duct (10) is equipped with an adjustable air volume regulating valve (12), which is connected to the PLC controller (11).

3. An energy-saving freezer based on a hybrid direct cooling and air cooling system according to claim 1, characterized in that: The second fan (9) is configured as a centrifugal fan.

4. An energy-saving freezer based on a hybrid direct cooling and air cooling system according to claim 1, characterized in that: The direct-cooling evaporator plate (8) is located on the side wall of the cold storage room (3).

5. An energy-saving freezer based on a hybrid direct cooling and air cooling system according to claim 1, characterized in that: When the freezer compartment (2) needs to be cooled, the PLC controller (11) starts the compressor and the first fan (7) and keeps the solenoid valve (17) closed.

6. An energy-saving freezer based on a hybrid direct cooling and air cooling system according to claim 1 or 5, characterized in that: When the refrigerator compartment (3) needs to be cooled, the PLC controller (11) starts the compressor and opens the solenoid valve (17); when the temperature of the refrigerator compartment (3) still does not meet the set temperature requirement after cooling, the PLC controller (11) starts the second fan (9) for auxiliary cooling.

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