A refrigerator provided with a function-variable chamber

Abstract

This invention discloses a refrigerator with a variable-capacity compartment, divided from top to bottom into a first refrigerator compartment, a second refrigerator compartment, and a freezer compartment. The freezer compartment uses an air-cooled evaporator for cooling, while the first and second refrigerator compartments use adhesive-type direct-cooling evaporators. This invention, by incorporating a compensating air duct and three ventilation dampers within the bubble layer, allows for independent control of the air-cooling capacity delivered to the two refrigerator compartments. Combined with a compartment temperature sensor, it enables soft-freezing or converts one or both refrigerator compartments into an extended freezer compartment, achieving variable capacity without moving partitions. Independent return air channels ensure refrigeration cycle efficiency, and L-shaped heat-conducting aluminum fins passively conduct waste heat from the refrigerator compartment to the damper frame. Combined with a hydrophobic coating on the damper and inner liner surface, a passive damper anti-icing structure is formed, improving operational reliability in high-humidity environments. This invention uses a variable-frequency compressor that automatically increases its frequency in variable-capacity mode to ensure refrigeration efficiency, offering advantages such as low cost, high reliability, and flexible use.

Description

Technical Field

[0001] This invention relates to the field of refrigerators, and more specifically, to a refrigerator having a variable-function compartment. Background Technology

[0002] As living standards improve, users are demanding greater storage flexibility from refrigerators. Traditional refrigerators have fixed refrigeration and freezing capacities, making it difficult to meet users' flexible needs: large refrigerated compartments for fruits and vegetables during normal times, and large frozen compartments for holiday goods. To address this, various variable-temperature / variable-capacity refrigerator technologies have emerged. However, adjusting the compartment volume by changing the shelf position presents challenges in designing a tight seal between different compartments and introduces wear issues. While independent variable-temperature compartments can be used, they still don't meet the storage needs and increase costs. Therefore, the industry urgently needs a low-cost, easily implemented new variable-capacity refrigerator solution. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator with a variable-function compartment, so as to overcome the shortcomings of the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A refrigerator with a variable-function compartment, employing a direct-cooling design, includes a cabinet and a compressor. The internal space of the cabinet is divided from top to bottom by a partition, forming a first refrigeration compartment, a second refrigeration compartment, and a freezer compartment. The freezer compartment has a refrigeration evaporator and a cooling fan mounted on the back of its inner liner. The evaporator serves as a cold source for air-cooling and, in conjunction with the cooling fan, delivers cold air to the compartment. The back of the inner walls of the first and second refrigeration compartments have adhesive-mounted direct-cooling evaporators, which provide direct cooling for both compartments. The underlying bubble layer also contains a compensating air duct, which, in conjunction with the refrigeration fan and the evaporator, provides air cooling to the first and second refrigeration chambers. The top of the compensating air duct has a first regulating air duct and a second regulating air duct. The first regulating air duct has a first cold air outlet, and the second regulating air duct has a second cold air outlet, respectively connecting to the first and second refrigeration chambers. The refrigerator controls the first and second regulating air ducts to change the temperature of the first and second refrigeration chambers, respectively, to achieve a compensating freezing function or convert the refrigeration chamber into a freezing chamber. The compressor is an inverter compressor, which increases its frequency to ensure cooling efficiency when providing air cooling to the refrigeration chamber.

[0005] The compensation air duct is also provided with a partition wall, which separates the third hot air duct and the main air duct. A semiconductor cooling chip is installed inside the partition wall, with the hot end of the semiconductor cooling chip facing the third hot air duct and the cold end of the semiconductor cooling chip facing the main air duct. The third hot air duct is provided with an independent hot air outlet, and an extended air duct is connected to the hot air outlet. The hot air output from the hot air outlet is cooled by the extended air duct and used for defrosting in various parts. The main air duct is responsible for delivering cold air to the refrigeration chamber.

[0006] Both the first and second regulating air ducts have a dual-outlet structure. Each duct is divided into two sub-ducts by a partition wall. A semiconductor cooling chip is installed inside the partition wall. The cold end of the semiconductor cooling chip faces one of the sub-ducts to form a cold air outlet, and the hot end faces the other sub-duct to form a hot air outlet. The cold air outlet is connected to the refrigeration chamber, and the hot air outlet is connected to an extended air duct. The hot air output from the hot air outlet is cooled by the extended air duct. After the hot air is cooled to a safe threshold, it is guided to various parts for defrosting. The cold air outlet of the first regulating air duct is connected to the first air inlet at the top of the first refrigeration chamber, and the cold air outlet of the second regulating air duct is connected to the second air inlet at the top of the second refrigeration chamber. The two cold air outlets are configured to be independently controllable to simultaneously or selectively supply air to the first and second refrigeration chambers, thereby realizing the freezing mode of converting a single refrigeration chamber into a freezing expansion chamber or converting both refrigeration chambers into freezing expansion chambers simultaneously.

[0007] When the partition wall separates the air ducts, the sub-air duct facing the hot end of the semiconductor cooling chip occupies less than 1 / 3 of the separated air duct.

[0008] The refrigeration evaporator is an aluminum tube and aluminum sheet structure, and is attached to the inner wall of the corresponding refrigeration cavity by thermally conductive adhesive, with a total thickness not exceeding 5mm; the freezing evaporator is an air-cooled finned evaporator.

[0009] The bottom of the first and second refrigerator compartments are respectively provided with return air vents. These vents are connected to independent return air channels leading to the bottom of the freezer compartment, circulating the return air to the evaporator and refrigeration fan. Each of the first, second, and freezer compartments is equipped with a compartment temperature sensor. Based on the temperature sensor readings, the refrigerator controls the airflow into the first and second regulating air ducts. Air is supplied through a three-way valve to regulate the amount of cold air entering the corresponding refrigerator compartment, achieving the soft-freezing function or converting the corresponding refrigerator compartment into a freezer extension compartment. The refrigerator controller controls the start and stop of the thermoelectric cooler based on the temperature sensor readings. Preferably, when the temperature is above -2 degrees Celsius, the regulating air ducts are fully open, and the thermoelectric cooler is activated; when the temperature drops to -5 degrees Celsius, the regulating air ducts are closed, and the thermoelectric cooler stops.

[0010] Preferably, if frost is detected, the semiconductor hot end is activated to defrost the refrigeration chamber.

[0011] Preferably, upon detecting frost, the semiconductor hot end is activated to defrost the evaporator. Preferably, the semiconductor cooling chip is activated at fixed time intervals to periodically prevent or defrost the evaporator or other areas prone to frost buildup, avoiding the difficulties of waiting for frost to accumulate and then defrosting.

[0012] The partition between the first refrigeration chamber, the second refrigeration chamber, and the freezing chamber is a fixed and immovable structure. The volume of the two refrigeration chambers remains unchanged, and the function is switched only by changing the cold distribution method.

[0013] The inner surface of the box and the inner surface of the frame of the two regulating air ducts are provided with a food-grade hydrophobic membrane.

[0014] The compressor is a variable frequency compressor. When any of the refrigeration chambers is converted into a refrigeration expansion chamber, the variable frequency compressor is configured to automatically increase its frequency to improve the cooling capacity.

[0015] The inner liner of the first refrigerator compartment is also provided with an L-shaped heat-conducting aluminum sheet. The L-shaped heat-conducting aluminum sheet has a hot end and a cold end. Its hot end is attached to the inner liner of the first refrigerator compartment by heat-conducting adhesive, and its cold end passes through the foam layer and is thermally connected to the damper frame of the two regulating air ducts in a surface contact manner. This is used to passively conduct the residual heat of the first refrigerator compartment to the damper area to raise the damper temperature above the dew point to prevent icing.

[0016] The above technical solution has the following beneficial effects: This invention employs a hybrid air-cooling and direct-cooling system, combined with a three-way solenoid valve to achieve variable capacity regulation. By connecting and coordinating air-cooling and direct-cooling systems in parallel, and by setting up automatic frequency increase control for the variable frequency compressor, it effectively improves cooling efficiency and temperature uniformity, reduces energy consumption, and saves costs. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a simplified diagram of the refrigerator of the present invention; Figure 2 This is a frontal longitudinal sectional view of the present invention; Figure 3 A simplified diagram of the refrigeration system of this invention. Figure 4 This is a simplified diagram of the refrigeration system operation of the present invention; Figure 5 This is a simplified diagram of the air duct setup according to Embodiment 1 of the present invention; Figure 6 This is a simplified diagram of the air duct arrangement in Embodiment 2 of the present invention; Figure 7 This is a simplified diagram of the extended air duct design of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Variable frequency compressor; 2. Condenser; 21. Filter; 22. First three-way solenoid valve; 23. Liquid receiver; 3. Refrigeration evaporator; 31. Freezing chamber; 32. Freezing capillary tube; 4. Refrigeration evaporator; 41. First refrigeration chamber; 411. First air inlet; 42. Second refrigeration chamber; 421. Second air inlet; 43. Refrigeration capillary tube; 5. Compensating air duct; 51. First regulating air duct; 511. First cold air outlet; 52. Second regulating air duct 521. Second cold air outlet; 53. First and third ventilation doors; 6. Partition wall; 61. Hot air duct; 611. Hot air outlet; 7. Extended air duct; 71. Evaporator hot air outlet; 72. Freezer chamber defrost outlet; 72. Freezer chamber defrost outlet; 73. First refrigerator chamber defrost outlet; 74. Second refrigerator chamber defrost outlet; 75. Cooling zone; 76. Refrigerator chamber defrost duct; 81. Second and third ventilation doors; 82. Third and third ventilation doors; 83. Fourth and third ventilation doors; 9. Refrigeration fan. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] See Figures 1-6As shown, this invention discloses a refrigerator with a variable-capacity chamber, employing a direct-cooling design. It includes a variable-frequency compressor 1, a condenser 2, a filter 21, a first three-way solenoid valve 22, a liquid receiver 23, a freezing evaporator 3, a freezing capillary tube 32, a refrigeration evaporator 4, and a refrigeration capillary tube 43. The outlet of the variable-frequency compressor 1 is connected to the condenser 2, the outlet of the condenser 2 is connected to the filter 21, and the outlet of the filter 21 is connected to the inlet of the first three-way solenoid valve 22. The two ends of the first three-way solenoid valve 22... Each outlet is connected to a freezing capillary tube 32 and a refrigeration capillary tube 43 respectively: the outlet of the freezing capillary tube 32 is connected to the freezing evaporator 3, and the outlet of the freezing evaporator 3 is connected to the liquid receiver 23; the outlet of the refrigeration capillary tube 43 is connected to the refrigeration evaporator 4, the outlet of the refrigeration evaporator 4 is connected to the liquid receiver 23, and the outlet of the liquid receiver 23 is connected to the compressor 1; the freezing evaporator 3 and the refrigeration evaporator 4 are connected in parallel through the first three-way solenoid valve 22, and together with the variable frequency compressor 10, they form a refrigeration circuit to provide a cold source for each compartment of the refrigerator.

[0023] Preferably, the refrigerator's body is divided into three compartments from top to bottom by a partition: a first refrigerator compartment 41 and a second refrigerator compartment 42 at the top, and a freezer compartment 31 at the bottom. The partition is a fixed, immovable structure. When the compartment volume needs to be changed, the volumes of the first refrigerator compartment 41, the second refrigerator compartment 42, and the freezer compartment 31 remain unchanged. There is no need to modify the cabinet structure; the function is switched by increasing the output of the inverter compressor 1 and the freezer evaporator 3, thereby achieving capacity adjustment.

[0024] The evaporator 3 is an air-cooled finned evaporator equipped with a refrigeration fan, located at the back of the freezing chamber 31. In standard preservation mode, the evaporator 3, together with the refrigeration fan 9, provides air-cooling to the freezing chamber 31, maintaining the freezing chamber 31 at a temperature of -18°C, and is designed to be frost-free.

[0025] The refrigeration evaporator 4 is a direct-cooling adhesive evaporator, which is attached to the back of the left and right side walls of the inner liner of the first and second refrigeration chambers 41 and 42. In this embodiment, the refrigeration evaporator 4 adopts an aluminum tube and aluminum sheet adhesive structure. The serpentine aluminum tube is attached to the aluminum plate with high thermal conductivity adhesive, and then the whole assembly is attached to the back of the side wall of the inner liner with thermal conductivity adhesive. The refrigeration evaporator 4 is hidden in the bubble layer on the back of the inner liner, without occupying internal storage space, and the inner wall of the inner liner remains flat. When the refrigerator is working, the refrigeration evaporator 4 operates, providing direct cooling to the refrigeration chamber, and the temperature is maintained at 2-5℃.

[0026] The refrigerator is also equipped with a compensating air duct 5 in the foam layer on the back of the inner liner of the first refrigerator cavity 41, the second refrigerator cavity 42 and the freezer cavity 31. The compensating air duct 5 provides air cooling to the first refrigerator cavity 41 and the second refrigerator cavity 42 in conjunction with the refrigeration fan 9. At the top of the compensating air duct 5, there is a first regulating air duct 51 and a second regulating air duct 52. The first regulating air duct has a first cold air outlet 511 connected to the first air inlet 411 of the first refrigerator cavity 41, and the second regulating air duct has a second cold air outlet 521 connected to the second air inlet 421 of the second refrigerator cavity 42. The bottom of the first refrigerator cavity 41 and the second refrigerator cavity 42 are respectively provided with independent return air inlets. The return air inlets are connected to the bottom of the freezer cavity 31 through independent return air ducts, and are connected to the air inlet side of the space where the refrigeration evaporator 3 and the refrigeration fan 9 are located.

[0027] Preferably, the compensating air duct 5 is equipped with a first three-way ventilation damper 53 to control the first regulating air duct 51 and the second regulating air duct 52. The main air duct of the compensating air duct 5 is connected to the inlet of the first three-way ventilation damper 53, and the two outlets of the first three-way ventilation damper 53 are respectively connected to the first regulating air duct 51 and the second regulating air duct 52, thereby independently controlling the opening and closing states of the first cold air outlet 511 and the second cold air outlet 521 to meet the needs of different working modes. If the three-way solenoid valve is a two-position three-way valve, then there are two of them, that is, one is connected to each of the first regulating air duct and the second regulating air duct.

[0028] In this embodiment, the first regulating air duct 51 and the second regulating air duct 52 are respectively separated into two sub-air ducts by partition walls, forming a dual-outlet design. A semiconductor cooling chip is provided inside the partition wall 6. The cold end of the semiconductor cooling chip faces one of the sub-air ducts, which corresponds to the first cold air outlet 511 and the second cold air outlet 521, respectively. The hot end of the semiconductor cooling chip faces the other sub-air duct, which corresponds to the hot air outlet of the first regulating air duct 51 and the second regulating air duct 52, respectively. An extended air duct 7 is connected to the hot air outlet. By cooling the cold end of the semiconductor cooling chip, the cold air passing through the first regulating air duct 51 and the second regulating air duct 52 is further cooled to improve the cooling effect of the cold storage chamber and accelerate the freezing process. Preferably, a set of mesh-like aluminum fins are connected to the hot end to enhance the heating of the air. Meanwhile, the hot end of the semiconductor cooling chip generates heat. Preferably, the air passing through is delivered from the hot air outlet 611 to the extended air duct 7. After being cooled by the extended air duct 7, it is then input into various parts of the refrigerator for defrosting, or to balance the cold temperature and delay frost formation, preventing the directly delivered defrosting air from being too hot and damaging the food.

[0029] The partition wall 6 divides the regulating air duct into a sub-air duct on the cold end side of the semiconductor cooling chip and a sub-air duct on the hot end side of the semiconductor cooling chip in a 2:1 cross-sectional area ratio.

[0030] To further improve reliability in extreme high humidity environments, L-shaped high thermal conductivity aluminum sheets can be configured on the frames of the first regulating air duct 51 and the second regulating air duct 52 as passive anti-condensation structures. The hot end of the aluminum sheet is attached to the back of the inner liner of the first refrigeration chamber 41 with thermally conductive adhesive, and the cold end passes through the foam layer and is attached to the back of the damper frame in a surface contact manner, so as to introduce the stable residual heat of the first refrigeration chamber 41 into the damper area, so that the temperature of the damper frame is stabilized above 4°C, which is higher than the air dew point.

[0031] Meanwhile, the inner surfaces of the two air ducts and the support frame are coated with a food-grade hydrophobic coating to ensure that even if condensation occurs occasionally under extreme operating conditions, the water droplets will quickly slide off and will not accumulate.

[0032] The first refrigeration chamber 41, the second refrigeration chamber 42, and the freezer chamber 31 are equipped with chamber temperature sensors to facilitate the refrigerator's control of the inverter compressor output temperature at the set temperature.

[0033] Work process description: Standard Preservation Mode: The first and third ventilation doors 53 are closed, and the refrigeration fan 9 stops supplying cold air to the compensation air duct 5. At this time, the refrigerator evaporator 4 operates normally, providing direct cooling to the two refrigerator compartments, and ensuring the temperature is controlled between 2-5℃ according to the temperature sensors in the refrigerator compartments. The refrigeration fan 9 operates independently, providing air cooling to the freezer compartment 40, ensuring the temperature of the freezer compartment 40 is below -18℃. At this time, the refrigerator is in standard refrigerator + freezer mode.

[0034] Single-zone extended freezing mode: When the user needs to add a freezing space the size of a refrigerator compartment, for example, by converting the first refrigerator compartment 41 into an extended freezing chamber: the controller controls the opening of the first regulating air duct through the second three-way valve 53, and opens the first cold air outlet 511, opening the air duct leading to the first refrigerator compartment 41, and automatically increasing the frequency of operation in conjunction with the variable frequency compressor 1. At this time, the refrigeration fan 9, in conjunction with the evaporator 3, sends -25°C cold air through the compensation air duct 5 and the sub-air duct on the cold end side of the semiconductor cooling chip in the first regulating air duct 51, from the first air inlet 411 into the top of the first refrigerator compartment 41. After circulating within the first refrigerator compartment 41, the cold air returns to the space where the evaporator 3 and the refrigeration fan 9 are located via the return air vent at the bottom, and is cooled again by the evaporator 3. During this process, the refrigeration evaporator 4, together with the cooling fan 9, delivers cold air, and with the assistance of the semiconductor cooling chip, the temperature of the first refrigeration chamber 41 drops to below -18°C, transforming it into a freezer expansion chamber. Meanwhile, the second refrigeration chamber 42 is still only directly cooled by the refrigeration evaporator 4, maintaining a temperature of 2-5°C. At the same time, some air is delivered from the hot air outlet to the extended air duct 7 via the sub-air duct on the hot end side of the semiconductor cooling chip, and guided to the chamber for defrosting. The extended air duct 7 is divided into two paths by the second and third ventilation doors 81. One path enters the space where the evaporator 3 is located through the evaporator hot air inlet 71, and the other path enters the cooling zone 5. The air temperature entering the space where the evaporator 3 is located is higher because it is close to the semiconductor cooling chip and has a shorter path. Preferably, the cooling zone 5 is set as a serpentine air duct to naturally cool the hot air. At this time, the cooled air passes through the third ventilation door 82 and can be controlled to enter the defrosting air duct 76 of the refrigerator cavity or enter the freezer cavity through the defrosting port 72 of the freezer cavity. Part of the air entering the defrosting air duct 76 of the refrigerator cavity passes through the fourth ventilation door 83 and can be controlled to enter the first or second defrosting port of the refrigerator cavity. Among them, the second and third ventilation doors 81, the third and third ventilation doors 82, and the fourth and third ventilation doors 83 can all be controlled independently, thereby realizing individual defrosting or simultaneous defrosting of each chamber.

[0035] Full freezing mode: When the user needs an extra-large freezing space, the controller controls the opening of the first regulating air duct 51 and the second regulating air duct 52, and opens the first cold air outlet 511 and the second cold air outlet 521. At this time, the variable frequency compressor 1 increases its frequency to ensure the cooling demand of the evaporator 3. The refrigeration fan 9 delivers -25°C cold air through the sub-air ducts on the cold end side of the semiconductor cooling chip of each of the compensating air ducts 5 and the first regulating air ducts 51 and the second regulating air ducts 52, from the first air inlet 411 and the second air inlet 421. 21 is sent to the top of the two refrigeration chambers. After circulating in the first refrigeration chamber 41 and the second refrigeration chamber 42 respectively, the cold air returns to the space where the freezer evaporator 3 and the refrigeration fan 9 are located from the return air vents at the bottom of each refrigeration chamber. It is then cooled again by the freezer evaporator 3, and the temperature of the two refrigeration chambers drops to below -18°C, converting them into extended refrigeration chambers to meet the needs of stockpiling. Meanwhile, part of the air is transported from the hot air outlet to the extended air duct through the sub-air duct on the hot end side of the semiconductor cooling chip. After being cooled, it is guided to the chamber for defrosting. The hot end of the semiconductor can heat the air and remove moisture at the same time. Traditional defrosting uses heating devices, while the micro-wind heating method of this invention can prevent a large accumulation of frost before defrosting, reducing the difficulty of defrosting. The dampers of the first regulating air duct 51 and the second regulating air duct 52 are preferably controlled at 5%-15% when defrosting is required in the first and second refrigeration chambers, and can be adjusted to control the amount of micro-wind generated. During defrosting, the air duct damper should be kept at a small opening of 5%-15% to ensure a small amount of air circulation and maintain convective defrosting conditions.

[0036] Semiconductor cooling chip operating power: 30-60W, hot end temperature: 45-60℃.

[0037] Defrosting outlet temperature: 25-45℃ Formula for calculating air temperature rise ΔT≈Q / (0.33×V) ΔT: Air temperature rise (°C) Q: Effective heat dissipation (W) at the hot end of a semiconductor; for a 30-60W semiconductor, the heat dissipation is approximately 1.2-1.5 times the input power. V: Total air volume in the duct (m³ / h), typically 5-20 m³ / h during defrosting operation. With a 50W semiconductor, a total air volume of 10m³ / h, and an initial refrigeration air inlet temperature of 5℃ The effective heat release at the hot end is approximately 65W. Substituting this into the formula, we get a temperature rise of approximately 20℃. The hot end outlet air temperature = 5℃ + 20℃ = 25℃, which is within the defrosting temperature range.

[0038] When the refrigeration chamber is converted into a freezer extended chamber, the refrigeration evaporator 4 still provides direct cooling to the refrigeration chamber as an auxiliary cooling measure for the freezer evaporator 3, without the need for frequent switching.

[0039] In another embodiment, the partition 6 is provided in the compensation air duct 5 and divides the compensation air duct 5 into two sub-air ducts. The air duct on the cold end side of the semiconductor cooling chip is responsible for delivering cold air to the first regulating air duct 51 and the second regulating air duct 52 and cooling the cold air. The air duct on the hot end side of the semiconductor cooling chip delivers the air heated by the semiconductor hot end to the epitaxial air duct 7 through an independent hot air outlet. Finally, after cooling, the air is guided to various parts for defrosting.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A refrigerator with a variable-function compartment, employing a direct-cooling design, comprising a cabinet and a compressor, wherein the internal space of the cabinet is divided from top to bottom by a partition to sequentially form a first refrigeration compartment (41), a second refrigeration compartment (42), and a freezing compartment (31), characterized in that, The back of the inner liner of the freezing chamber (31) is provided with a freezing evaporator (3) and a refrigeration fan (9). The freezing evaporator (3) serves as a cold source for providing air-cooled refrigeration and works with the refrigeration fan to deliver cold energy to the chamber. The back of the inner liner sidewalls of the first refrigeration chamber (41) and the second refrigeration chamber (42) are provided with adhesive direct-cooling evaporators as refrigeration evaporators (4). The refrigeration evaporators (4) provide direct-cooling refrigeration for the first refrigeration chamber and the second refrigeration chamber. The cabinet is also provided with a compensating air duct (5) in the foam layer behind the inner liner of the refrigeration chamber and the freezing chamber (3) so that the refrigeration fan (9) works with the freezing evaporator (3) to provide air-cooled refrigeration to the first refrigeration chamber (41) and the second refrigeration chamber (42). For cooling, the top of the compensation air duct (5) is provided with a first regulating air duct (51) and a second regulating air duct (52). The first regulating air duct (51) is provided with a first cold air outlet (511), and the second regulating air duct (52) is provided with a second cold air outlet (521), which are respectively connected to the first refrigeration chamber (41) and the second refrigeration chamber (42). The refrigerator changes the temperature of the first refrigeration chamber (51) and the second refrigeration chamber (42) by controlling the first regulating air duct (51) and the second regulating air duct (52) to realize the compensation freezing function or convert the refrigeration chamber into a freezing chamber. The compressor adopts a variable frequency compressor (1), which increases the frequency to ensure the cooling efficiency when providing air cooling to the refrigeration chamber.

2. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The compensation air duct (5) is also provided with a partition wall (6), which separates the hot air duct (61) and the main air duct. A semiconductor cooling chip is provided inside the partition wall (6), with the hot end of the semiconductor cooling chip facing the hot air duct (61) and the cold end of the semiconductor cooling chip facing the main air duct. The hot air duct (61) is provided with an independent hot air outlet (611), and an extended air duct (7) is connected to the hot air outlet (611). The hot air output from the hot air outlet (611) is cooled by the extended air duct and used for defrosting in various parts. The main air duct is responsible for delivering cold air to the refrigeration chamber.

3. A refrigerator with a variable-function compartment according to claim 2, characterized in that, Both the first regulating air duct (51) and the second regulating air duct (52) have a dual-outlet structure. Both the first regulating air duct (51) and the second regulating air duct (52) are provided with a partition wall (6) to divide the air duct into two sub-air ducts. A semiconductor cooling chip is provided inside the partition wall (6). The cold end of the semiconductor cooling chip faces one of the sub-air ducts to form a cold air outlet, and the hot end of the semiconductor cooling chip faces the other sub-air duct to form a hot air outlet (611). The cold air outlet is connected to the refrigeration chamber. An extended air duct (7) is connected to the outside of the hot air outlet (611). The hot air outlet outputs (611). The hot air is cooled down by the extended air duct (7) and then guided to various parts for defrosting after the hot air is cooled down to a safe threshold. The cold air outlet of the first regulating air duct (51) is connected to the first air inlet (411) at the top of the first refrigeration chamber (41), and the cold air outlet of the second regulating air duct (52) is connected to the second air inlet (421) at the top of the second refrigeration chamber (42). The two cold air outlets are configured to be independently controllable and simultaneously or selectively supply air to the first refrigeration chamber and the second refrigeration chamber, thereby realizing the freezing mode of converting a single refrigeration chamber into a freezing expansion chamber or converting both refrigeration chambers into freezing expansion chambers at the same time.

4. A refrigerator with a variable-function compartment according to claim 2, characterized in that, When the partition wall separates the air ducts, the cross-section of the sub-air duct facing the hot end of the semiconductor cooling chip occupies less than 1 / 3 of the cross-section of the separated air duct.

5. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The refrigeration evaporator (4) is an aluminum tube and aluminum sheet structure, and is attached to the inner wall of the corresponding refrigeration cavity by thermally conductive adhesive, with a total thickness not exceeding 5mm; the freezing evaporator (3) is an air-cooled finned evaporator.

6. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The bottom of the first refrigeration chamber (41) and the bottom of the second refrigeration chamber (42) are respectively provided with return air inlets. The two return air inlets are respectively connected to the bottom of the freezing chamber (31) through independent return air channels to circulate the return air to the position of the freezing evaporator (3) and the refrigeration fan (9).

7. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The first refrigeration chamber (41), the second refrigeration chamber (42) and the freezing chamber (31) are respectively equipped with chamber temperature sensors. The refrigerator controls the action of sending air to the first regulating air duct (51) and the second regulating air duct (52) according to the detection result of the chamber temperature sensor. The refrigerator sends air to the first regulating channel (51) and the second regulating channel (52) through the first three ventilation doors (53) set in the compensation air duct (5) to regulate the amount of cold air sent into the corresponding refrigeration chamber, so as to realize the soft freezing function or convert the corresponding refrigeration chamber into a freezing extended chamber.

8. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The partition between the first refrigeration chamber (41), the second refrigeration chamber (42) and the freezing chamber (31) is a fixed and immovable structure. The volume of the two refrigeration chambers remains unchanged, and the function is switched only by switching the cold distribution method.

9. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The inner surface of the box and the inner surface of the frame of the air regulating duct are provided with a food-grade hydrophobic membrane.

10. A refrigerator with a variable-function compartment according to claim 1, characterized in that, The inner back of the first refrigeration chamber (41) is also provided with an L-shaped heat-conducting aluminum sheet. The L-shaped heat-conducting aluminum sheet has a hot end and a cold end. Its hot end is attached to the inner back of the first refrigeration chamber through heat-conducting adhesive, and its cold end passes through the foam layer and is thermally connected to the damper frame of the two regulating air ducts in a surface contact manner. It is used to passively conduct the residual heat of the first refrigeration chamber (41) to the damper area to raise the damper temperature to above the dew point to prevent freezing.

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