Refrigerating and freezing device

Abstract

The present invention provides a refrigeration and freezing device, comprising a high-temperature refrigeration cycle and a low-temperature refrigeration cycle; the high-temperature refrigeration cycle comprises a first throttling device, a heat-absorbing pipe section, and a first evaporator for absorbing heat; the low-temperature refrigeration cycle comprises a first low-temperature condenser and a low-temperature evaporator for absorbing heat, the first low-temperature condenser being thermally connected to the first evaporator; the heat-absorbing pipe section is disposed between the outlet of the first throttling device and the inlet of the first evaporator, or the inlet of the heat-absorbing pipe section is connected to the outlet of the first evaporator; the heat-absorbing pipe section is thermally connected to the first throttling device, allowing refrigerant flowing through the heat-absorbing pipe section to exchange heat with refrigerant flowing through the first throttling device. The refrigeration and freezing device facilitates the operation of the entire refrigeration system and improves the efficiency of the refrigeration and freezing device.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration storage, and in particular to a refrigeration and freezing device. Background Art

[0002] Currently, most refrigerators on the market have variable-temperature compartments with a temperature range of 8-18°C and a relatively conventional overall design. With the gradual improvement of people's living standards, these temperature-zone refrigerators no longer meet their needs. There is a need for high-end refrigerators with a wider temperature range, more comprehensive functions, and the ability to meet a wider range of user needs. To preserve food in a glassy state below -40°C, which maximizes its nutritional value, there is a demand for ultra-low-temperature compartments (-40 to -60°C) in the high-end market. To improve user satisfaction and enhance user experience, conventional cascade compression refrigeration systems typically consist of two separate refrigeration circuits: a high-temperature refrigeration circuit (referred to as the high-temperature section) and a low-temperature refrigeration circuit (referred to as the low-temperature section). The high-temperature section uses a first refrigerant with a relatively high evaporation temperature, while the low-temperature section uses a second refrigerant with a relatively low evaporation temperature. A condenser evaporator utilizes the cooling energy generated by the first refrigerant in the high-temperature section to condense the second refrigerant vapor discharged from the compressor in the low-temperature section, thereby achieving temperatures below -60°C. However, the inventors have discovered that the refrigeration efficiency of existing partial cascade compression refrigeration systems is low. Summary of the Invention

[0003] An object of the present invention is to provide a refrigeration and freezing device that at least partially solves the above-mentioned problem, so as to improve the refrigeration efficiency of the cascade compression refrigeration system.

[0004] To this end, the present invention provides a refrigeration and freezing device, comprising a refrigeration system, wherein the refrigeration system comprises a high-temperature refrigeration cycle circuit and a low-temperature refrigeration cycle circuit;

[0005] The high-temperature refrigeration cycle includes a first throttling device, a heat-absorbing pipe section, and a first evaporator for absorbing heat; the low-temperature refrigeration cycle includes a first low-temperature condenser and a low-temperature evaporator for absorbing heat, and the first low-temperature condenser is thermally connected to the first evaporator;

[0006] The heat absorbing pipe section is arranged between the outlet of the first throttling device and the inlet of the first evaporator, or the inlet of the heat absorbing pipe section is connected to the outlet of the first evaporator;

[0007] The heat absorbing pipe section is thermally connected to the first throttling device, so that the refrigerant flowing through the heat absorbing pipe section and the refrigerant flowing through the first throttling device perform heat exchange.

[0008] Optionally, the low-temperature refrigeration cycle loop further includes a heat release pipe section, a low-temperature throttling device and a heat absorption return pipe section;

[0009] The outlet of the heat release pipe section is connected to the inlet of the first low-temperature stage condenser;

[0010] The low-temperature stage throttling device is arranged between the outlet of the first low-temperature stage condenser and the inlet of the low-temperature stage evaporator;

[0011] The inlet of the heat-absorbing return air pipe section is connected to the outlet of the low-temperature stage evaporator;

[0012] The heat absorbing return air pipe section is thermally connected to the heat releasing pipe section, and / or the heat absorbing return air pipe section is thermally connected to the low temperature stage throttling device.

[0013] Optionally, the heat absorption return air pipe section includes a first heat exchange section and a second heat exchange section connected in series, the first heat exchange section is arranged between the low-temperature stage evaporator and the second heat exchange section, the second heat exchange section is thermally connected to the heat release pipe section, and the first heat exchange section is thermally connected to the low-temperature stage throttling device.

[0014] Optionally, the low-temperature refrigeration cycle includes a second low-temperature condenser, and the inlet of the heat release pipe section is connected to the outlet of the second low-temperature condenser.

[0015] Optionally, the high-temperature refrigeration cycle further includes a second evaporator for absorbing heat;

[0016] The second evaporator is arranged between the outlet of the first throttling device and the inlet of the first evaporator, and the inlet of the heat absorption pipe section is connected to the outlet of the first evaporator; or, the second evaporator is arranged between the outlet of the first throttling device and the inlet of the heat absorption pipe section, and the heat absorption pipe section is arranged between the outlet of the second evaporator and the inlet of the first evaporator.

[0017] Optionally, the first evaporator and the first low-temperature stage condenser are an integral structure.

[0018] Optionally, the refrigerator-freezer further comprises a box body, in which a first storage compartment and a second storage compartment are provided; the first evaporator is used to provide cooling for the second storage compartment, and the low-temperature stage evaporator is used to provide cooling for the first storage compartment.

[0019] Optionally, the first evaporator includes a first cooling evaporation tube, the first low-temperature stage condenser includes a condensation tube, and the first cooling evaporation tube and the condensation tube are provided on the same fin group;

[0020] The first evaporator is arranged on the upper side of the first low-temperature stage condenser or on one side of the first low-temperature stage condenser in the horizontal direction;

[0021] The total length of the first cooling evaporation tube is 1.5 to 2 times the total length of the condenser tube.

[0022] Optionally, the refrigerator-freezer further comprises a box body, wherein a first storage compartment is provided in the box body; the low-temperature stage evaporator is used to provide cooling for the first storage compartment;

[0023] The high-temperature refrigeration cycle includes a third evaporator for absorbing heat, and the third evaporator is used to provide cooling for the first storage compartment;

[0024] The third evaporator and the low-temperature stage evaporator are an integral structure; the third evaporator includes a second cooling evaporation tube, and the low-temperature stage evaporator includes a third cooling evaporation tube, and the second cooling evaporation tube and the third cooling evaporation tube are arranged on the same fin group.

[0025] Optionally, a third storage compartment is further provided in the box;

[0026] The high-temperature refrigeration cycle includes a control valve, a second throttling device, a third throttling device, and a third evaporator and a fourth evaporator for absorbing heat. The third evaporator is used to provide cooling for the first storage compartment; the fourth evaporator is used to provide cooling for the third storage compartment.

[0027] The control valve has a first outlet, a second outlet, and a third outlet. The inlet of the first evaporator is connected to the first outlet through the first throttling device, and the inlet of the third evaporator is connected to the second outlet through the second throttling device; the outlet of the third evaporator is connected to the inlet of the first evaporator; the inlet of the fourth evaporator is connected to the third outlet through the third throttling device, and the outlet of the fourth evaporator is connected to the inlet of the first evaporator;

[0028] The outlet pipe of the third evaporator is provided with a valve that only allows the refrigerant from the third evaporator to flow out in one direction;

[0029] The heat absorbing pipe section is also thermally connected to the second throttling device, and / or the heat absorbing pipe section is thermally connected to the third throttling device.

[0030] In the refrigeration and freezing device of the present invention, a first throttling device and a heat absorption pipe section are provided in the high-temperature refrigeration cycle circuit, which can improve the efficiency of the high-temperature compressor, facilitate the operation of the high-temperature refrigeration cycle circuit, and thus be beneficial to the operation of the entire refrigeration system and improve the efficiency of the refrigeration and freezing device.

[0031] Furthermore, the inventors discovered that the existing low-temperature cycle evaporation temperature and pressure, coupled with the high heat exchange capacity of the condenser evaporator, are detrimental to the normal operation of the refrigeration system. Based on this, the refrigeration and freezing device of the present invention includes a heat-absorbing return air pipe section, which heats the refrigerant in the low-temperature refrigeration cycle before flowing into the suction port of the low-temperature compressor. This increases the suction temperature of the low-temperature compressor, reduces or avoids cooling loss due to excessively low suction temperatures, improves refrigeration efficiency, and reduces or avoids condensation or frosting around the suction port of the low-temperature compressor, thereby improving the operating performance of the refrigeration system.

[0032] In particular, in the refrigerator / freezer of the present invention, the heat-absorbing return pipe section is thermally connected to the heat-releasing pipe section, reducing the amount of heat exchanged between the first low-temperature stage condenser and the first evaporator, thereby improving refrigeration cycle efficiency. Compared to the present invention in which the heat-absorbing return pipe section exchanges heat only with the low-temperature stage throttling device, this further reduces the amount of heat exchanged, thereby increasing the degree of cooling of the low-temperature stage compressor exhaust.

[0033] Furthermore, in the refrigeration and freezing device of the present invention, both the high-temperature refrigeration cycle circuit and the low-temperature refrigeration cycle circuit can supply cold air to the storage compartments, thereby improving the energy utilization efficiency within the high-temperature refrigeration cycle circuit and being able to simultaneously supply cold air to multiple storage compartments of the refrigeration and freezing device, thereby improving the refrigeration efficiency of the refrigeration and freezing device.

[0034] Both the third evaporator and the low-temperature evaporator can supply cold air to the first storage compartment, so that a single storage compartment of the refrigerator-freezer can have a multi-temperature zone function to meet different refrigeration and storage needs, that is, the refrigerator-freezer can have both a deep-freezing function and meet the energy-saving needs of daily refrigeration.

[0035] In particular, the first low-temperature stage condenser directly exchanges heat with the first evaporator, eliminating the need for a dedicated evaporator condenser. This eliminates the need for a dedicated condenser evaporator, reduces the space occupied by the refrigeration system, reduces the number of components, and significantly reduces costs. The first evaporator can also be enlarged to increase the heat exchange area, resulting in a simple structure, easy processing, and uniform heat exchange.

[0036] The inventors discovered that due to the low temperature of the low-temperature chamber, i.e., the first storage compartment, the low-temperature chamber requires a large amount of heat to defrost the low-temperature evaporator, which consumes a large amount of electricity for heating and results in energy waste. Furthermore, since the original freezer compartment evaporator (i.e., the first evaporator) also requires defrosting, this inevitably increases the energy consumption of the entire machine. The present invention eliminates the first evaporator defrosting heater (or reduces the heater's power). During normal operation, the first evaporator has a large cooling capacity. In addition to cooling the freezer compartment, it can also cool the first low-temperature condenser, achieving a low-temperature function. When the first evaporator needs to be defrosted, the high-temperature refrigeration cycle stops and the low-temperature refrigeration cycle operates. The evaporator is defrosted by heat generated by the first low-temperature condenser. Because the first evaporator and the first low-temperature condenser can be an integral structure, the heat exchange efficiency is high, and the first evaporator can be defrosted quickly. At the same time, this portion of cooling capacity can be used to refrigerate the low-temperature cycle, eliminating the waste of the first evaporator's cooling capacity and achieving energy conservation.

[0037] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0039] Figure 1 is a schematic diagram of a refrigeration and freezing device according to one embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a refrigeration system in a refrigerator-freezer according to an embodiment of the present invention;

[0041] Figure 3 is a schematic diagram of a refrigeration system in a refrigerator-freezer according to an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of a partial structure of a refrigeration and freezing device according to an embodiment of the present invention;

[0043] Figure 5 It is a partial structural diagram of a refrigeration and freezing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] Figure 1 FIG is a schematic diagram of a refrigeration and freezing device according to an embodiment of the present invention. Figure 1 As shown, and reference Figures 2 to 5An embodiment of the present invention provides a refrigerator-freezer, which may include a housing 20 and a refrigeration system. The housing 20 may further include a plurality of storage compartments, which may include a first storage compartment 21, a second storage compartment 22, and a third storage compartment 23. The refrigerator-freezer of this embodiment may have one, two, or three storage compartments formed in the housing 20. A refrigeration system may be disposed in the housing 20, including a high-temperature refrigeration cycle 30 and a low-temperature refrigeration cycle 40. This refrigeration system may also be referred to as a cascade compression refrigeration system.

[0045] The high-temperature refrigeration cycle 30 circulates a first refrigerant and includes a first throttling device 341, a heat-absorbing pipe section 310, and a first evaporator 35 for absorbing heat. The first evaporator 35 is configured to facilitate heat absorption by the first refrigerant flowing through it. The high-temperature refrigeration cycle 30 also includes a high-temperature compressor 31 and a high-temperature condensing device 32. The low-temperature refrigeration cycle 40 circulates a second refrigerant and includes a first low-temperature condenser 42 and a low-temperature evaporator 44. The low-temperature evaporator 44 facilitates heat absorption by the second refrigerant flowing through it and is used to cool the first storage compartment 21. The low-temperature refrigeration cycle 40 also includes a low-temperature compressor 41 and a low-temperature throttling device 43. The first evaporator 35 facilitates heat absorption by the first refrigerant flowing through it from the second refrigerant flowing through the first low-temperature condenser 42 within the low-temperature refrigeration cycle 40. In other words, the first low-temperature condenser 42 is thermally connected to the first evaporator 35. The first refrigerant and the second refrigerant may be the same refrigerant, such as R600a, or different refrigerants.

[0046] The "high temperature" and "low temperature" in the "high temperature refrigeration cycle circuit 30" and the "low temperature refrigeration cycle circuit 40" are relative. Relatively speaking, the evaporation temperature of the first refrigerant flowing through the high temperature refrigeration cycle circuit 30 is higher than the evaporation temperature of the second refrigerant flowing through the low temperature refrigeration cycle circuit 40.

[0047] In particular, in this embodiment of the present invention, the heat absorption pipe section 310 is disposed between the outlet of the first throttling device 341 and the inlet of the first evaporator 35, or the inlet of the heat absorption pipe section 310 is in communication with the outlet of the first evaporator 35. The heat absorption pipe section 310 is thermally connected to the first throttling device 341, enabling heat exchange between the refrigerant flowing through the heat absorption pipe section 310 and the refrigerant flowing through the first throttling device 341. The provision of the first throttling device 341 and the heat absorption pipe section 310 in the high-temperature refrigeration cycle 30 improves the efficiency of the high-temperature compressor 31, facilitates the operation of the high-temperature refrigeration cycle 30, and thereby benefits the operation of the entire refrigeration system and enhances the efficiency of the refrigerator-freezer.

[0048] In some embodiments of the present invention, the inventors found that the existing low-temperature cycle evaporation temperature and pressure are too low, and the large heat exchange of the condenser evaporator is not conducive to the normal operation of the refrigeration system. Based on this, Figure 2 and Figure 3 As shown, the low-temperature refrigeration cycle 40 also includes a heat-releasing pipe section 410 and a heat-absorbing return pipe section. The outlet of the heat-releasing pipe section 410 is connected to the inlet of the first low-temperature condenser 42. A low-temperature throttling device 43 is disposed between the outlet of the first low-temperature condenser 42 and the inlet of the low-temperature evaporator 44. The inlet of the heat-absorbing return pipe section is connected to the outlet of the low-temperature evaporator 44.

[0049] In some embodiments of the present invention, the heat-absorbing return pipe section is thermally connected to the low-temperature throttling device 43. The heat-absorbing return pipe section in the refrigeration and freezing device of the present invention allows the refrigerant in the low-temperature refrigeration cycle 40 to be heated before flowing into the suction port of the low-temperature compressor, thereby increasing the suction temperature of the low-temperature compressor 41. This can reduce or avoid cooling loss due to excessively low suction temperatures, improve refrigeration efficiency, and reduce or avoid condensation or frosting around the suction port of the low-temperature compressor 41, thereby improving the operating performance of the refrigeration system.

[0050] In other embodiments of the present invention, the heat-absorbing return pipe section is thermally connected to the heat-releasing pipe section 410, thereby reducing the amount of heat exchanged between the first low-temperature stage condenser 42 and the first evaporator 35 and improving refrigeration cycle efficiency. Compared to the present invention in which the heat-absorbing return pipe section exchanges heat only with the low-temperature stage throttling device 43, this further reduces the amount of heat exchanged and increases the degree of cooling of the low-temperature stage compressor exhaust.

[0051] In some other embodiments of the present invention, the heat absorbing return air pipe section is thermally connected to the heat releasing pipe section 410, and the heat absorbing return air pipe section is also thermally connected to the low temperature stage throttling device 43. For example, Figure 2 and Figure 3 As shown, the heat absorption return air pipe section includes a first heat exchange section 451 and a second heat exchange section 452 connected in series. The first heat exchange section 451 is arranged between the low-temperature stage evaporator 44 and the second heat exchange section 452. The second heat exchange section 452 is thermally connected to the heat release pipe section 410, and the first heat exchange section 451 is thermally connected to the low-temperature stage throttling device 43.

[0052] Furthermore, the low-temperature refrigeration cycle includes a second low-temperature condenser 46 , and the inlet of the heat release pipe section 410 is connected to the outlet of the second low-temperature condenser 46 .

[0053] In some optional embodiments of the present invention, Figure 3As shown, the high-temperature refrigeration cycle further includes a second evaporator 37 for absorbing heat. The second evaporator 37 is positioned between the outlet of the first throttling device 341 and the inlet of the first evaporator, with the inlet of the heat-absorbing pipe section 310 communicating with the outlet of the first evaporator. Alternatively, the second evaporator 37 is positioned between the outlet of the first throttling device 341 and the inlet of the heat-absorbing pipe section 310, with the heat-absorbing pipe section 310 positioned between the outlet of the second evaporator 37 and the inlet of the first evaporator 35. The second evaporator 37 can be used to cool the second storage compartment 22, which is preferably a freezer compartment.

[0054] In some preferred embodiments of the present invention, Figure 2 As shown, the first evaporator 35 is used to provide cooling for the second storage compartment 22 .

[0055] In some embodiments of the present invention, Figure 2 、 Figure 4 and Figure 5 As shown, the first evaporator 35 and the first low-temperature stage condenser 42 are an integral structure. They can be fixedly connected to form an integral structure, or they can be mounted on the same component. For example, the first evaporator 35 includes a first cooling evaporator tube, and the first low-temperature stage condenser 42 includes a condenser tube. The first cooling evaporator tube and the condenser tube are arranged on the same fin assembly 70. Furthermore, the first evaporator 35 is arranged above the first low-temperature stage condenser 42 or on one side of the first low-temperature stage condenser 42 in the horizontal direction. The total length of the first cooling evaporator tube is 1.5 to 2 times the total length of the condenser tube. In other words, the first evaporator 35 and the first low-temperature stage condenser 42 can be an integral structure and can share fins. For example, the structure is an integrated two-inlet and two-outlet fin evaporator, arranged in an up-and-down structure or a front-to-back structure, and the fins are integrated fins to enable heat transfer between them. The second storage compartment 22 can be a freezer. Furthermore, the housing 20 further defines a first refrigeration chamber for arranging the first evaporator 35 at a position corresponding to the rear side of the second storage compartment 22. The first refrigeration chamber communicates with the second storage compartment 22 via a first air supply duct structure to provide cooling airflow to the second storage compartment 22. A supply blower may be provided in the first refrigeration chamber to encourage airflow into the second storage compartment 22.

[0056] In some embodiments of the present invention, Figure 4As shown, when the first evaporator 35 and the first low-temperature stage condenser 42 are arranged in a front-to-back structure, taking a three-row tube evaporator as an example, two rows of tubes are connected to the high-temperature stage refrigeration cycle loop 30, and a single row of tubes is connected to the low-temperature stage refrigeration cycle loop 40. When conventional -18°C refrigeration is required, the two rows of tubes connected to the high-temperature stage refrigeration cycle loop 30 work, and cooperate with the air duct and the refrigeration fan to realize room refrigeration; when the deep cooling function is turned on, the low-temperature stage refrigeration cycle loop 40 works, and the high-temperature stage refrigeration cycle loop 30 continues to work, through the heat conduction and heat exchange between the fins of the double row of tubes and the single row of tubes, and at the same time the air supply fan circulates, accelerating the heat exchange between the refrigerant in the double row of tubes and the refrigerant in the single row of tubes, thereby achieving the purpose of lowering the condensation temperature in the low-temperature stage refrigeration cycle loop 40, thereby achieving deep cooling by evaporation after throttling.

[0057] In some embodiments of the present invention, Figure 5 As shown, when the first evaporator 35 and the first low-temperature stage condenser 42 are arranged in an upper and lower structure, the upper pipeline serves as the first evaporator 35 and the lower pipeline serves as the first low-temperature stage condenser 42. The working mode is similar to the front and rear structures, but the upper and lower structures can ensure the uniformity of air supply and will not cause large temperature deviations on both sides of the overall structure formed by the first evaporator 35 and the first low-temperature stage condenser 42.

[0058] In some embodiments of the present invention, due to the low temperature of the low-temperature chamber (i.e., the first storage compartment 21), the low-temperature stage evaporator 44 needs to provide a large amount of heat for defrosting, resulting in high heating power consumption and energy waste. Furthermore, the original freezer compartment evaporator (i.e., the first evaporator 35) also needs to defrost, which inevitably increases the overall energy consumption of the unit. The present invention eliminates the defrost heater for the first evaporator 35 (or reduces the heater's power). During normal operation, the first evaporator 35 has a large cooling capacity. In addition to cooling the freezer compartment, it also cools the first low-temperature stage condenser 42, achieving a low-temperature function. When the first evaporator 35 needs to be defrosted, the high-temperature refrigeration cycle stops and the low-temperature refrigeration cycle operates. Heat generated by the first low-temperature stage condenser 42 defrosts the first evaporator 35. Because the first evaporator 35 and the first low-temperature stage condenser 42 can be integrally constructed, heat exchange efficiency is high, allowing the first evaporator 35 to be defrosted quickly. At the same time, this cooling capacity can be used to power the low-temperature cycle, eliminating the waste of cooling capacity in the first evaporator 35 and achieving energy savings.

[0059] In some embodiments of the present invention, the high-temperature refrigeration cycle 30 further includes a third evaporator 36. The third evaporator 36 is configured to absorb heat from the first refrigerant flowing through it and to provide cooling to the first storage compartment 21. Both the third evaporator 36 and the low-temperature evaporator 44 are capable of providing cooling to the first storage compartment 21, enabling the refrigerator-freezer to achieve multiple temperature zones within a single storage compartment. This allows the first storage compartment 21 to achieve different cooling effects to meet varying cooling requirements, thus expanding the temperature range of the first storage compartment 21. This allows the refrigerator-freezer to achieve both deep-freeze capabilities and energy-saving performance for everyday cooling.

[0060] In some embodiments of the present invention, the high temperature stage refrigeration cycle circuit 30 controls the valve 33. The inlet of the control valve 33 can be connected to the outlet of the high temperature stage condensing device 32. The control valve 33 has a first outlet and a second outlet. Figure 2 As shown, the first outlet is connected to the inlet of the first evaporator 35 through the first throttling device 341; the second outlet is connected to the inlet of the third evaporator 36 through the second throttling device 342. The outlet of the third evaporator 36 is connected to the inlet of the first evaporator 35. The control valve 33 can be a switching valve. The arrangement of each evaporator in the high-temperature refrigeration cycle 30 can ensure the cooling efficiency of each evaporator during normal temperature refrigeration, improve the energy efficiency of the refrigeration and freezing device, and achieve significant energy saving effects. In some optional embodiments of the present invention, the third evaporator 36 can be arranged between the first throttling device 341 and the first evaporator 35, and the inlet of the first throttling device 341 can be connected to the outlet of the high-temperature condensing device 32.

[0061] In some embodiments of the present invention, Figure 2 As shown, the control valve 33 has a third outlet. The high-temperature refrigeration cycle 30 also includes a fourth evaporator 38, which is disposed between the third outlet and the inlet of the first evaporator 35. The fourth evaporator 38 is used to cool the third storage compartment 23. A third throttling device 343 is disposed between the inlet and the third outlet of the fourth evaporator 38. When the first evaporator 35 is operating, it can also cool the third storage compartment 23, improving the efficiency of the high-temperature refrigeration cycle 30 and significantly saving energy.

[0062] In some optional embodiments of the present invention, Figure 3 As shown, the outlet of the first throttling device 341 , the third evaporator 36 and the fourth evaporator 38 are all connected to the inlet of the second evaporator 37 .

[0063] In some further embodiments of the present invention, the first throttling device 341, the second throttling device 342 and the third throttling device 343 can all be capillaries. The heat absorbing pipe section 310 is also thermally connected to the second throttling device 342, and / or the heat absorbing pipe section 310 is thermally connected to the third throttling device 343.

[0064] In some embodiments of the present invention, Figure 1 As shown, the second storage compartment 22 and the first storage compartment 21 are arranged side by side along the lateral extension of the refrigerator-freezer, and the third storage compartment 23 is located above the second storage compartment 22 and the first storage compartment 21. The second storage compartment 22 can be a freezer, the first storage compartment 21 can be a multi-functional compartment with multiple temperature zones, and the third storage compartment 23 can be a refrigerator. This arrangement makes the compartment layout more rational and more convenient for storing and accessing items.

[0065] In some embodiments of the present invention, the refrigerator / freezer further includes an air supply device configured to promote airflow through the third evaporator 36 and / or the low-temperature evaporator 44, and to promote airflow into the first storage compartment 21. In some preferred embodiments, the third evaporator 36 includes a second cooling evaporator tube, and the low-temperature evaporator 44 includes a third cooling evaporator tube. The second cooling evaporator tube and the third cooling evaporator tube are disposed on the same fin assembly. The third evaporator 36, the low-temperature evaporator 44, and the fin assembly they are disposed on can form a double-tube evaporator. In other words, the double-tube evaporator comprises two sets of evaporator tubes, namely, the third evaporator 36 and the low-temperature evaporator 44. The third evaporator 36 is disposed above the low-temperature evaporator 44.

[0066] Furthermore, the box body 20 is also formed with a second refrigeration chamber for arranging the third evaporator 36 and the low-temperature stage evaporator 44 at a position corresponding to the rear side of the first storage compartment 21. The second refrigeration chamber is connected to the first storage compartment 21 through a second air supply duct structure to provide a refrigeration airflow to the first storage compartment 21 through the second air supply duct structure.

[0067] The third evaporator 36 and the low-temperature evaporator 44 are integrally structured and can share fins. For example, they are a two-inlet, two-outlet dual-channel evaporator with an upper and lower structure. When the refrigeration unit is set to normal operation, the high-temperature refrigeration cycle 30 is in operation, and the upper third evaporator 36 is cooling. At this time, the evaporators share the fins of the lower evaporator, resulting in a large heat exchange area and high heat exchange efficiency. When the refrigeration unit is set to cryogenic operation, the lower low-temperature evaporator 44 is connected, the cryogenic system is in operation, the lower evaporator cools down, and at the same time, the evaporators share the fins of the upper evaporator, resulting in a large heat exchange area and high heat exchange efficiency. The upper and lower evaporator structures can also ensure uniform heat exchange. This ensures the utilization rate of the evaporator's heat exchange area, reduces the size of the dual-channel evaporator, and at the same time, uniform heat exchange and uniform pipeline distribution. In conjunction with the air duct system and the refrigeration fan, both normal temperature refrigeration and cryogenic refrigeration functions can be achieved, while also ensuring energy saving during conventional refrigeration.

[0068] In some embodiments of the present invention, the cabinet 20 is further formed with a third refrigeration chamber for arranging a fourth evaporator 38 at a position corresponding to the rear side of the third storage compartment 23. The third refrigeration chamber is connected to the third storage compartment 23 through a third air supply duct structure to provide a cooling airflow to the third storage compartment 23 through the third air supply duct structure.

[0069] In some embodiments of the present invention, a valve is provided on the outlet pipe of the third evaporator 36 that only allows one-way outflow of refrigerant from the third evaporator 36. The valve may be a one-way valve that can prevent the first refrigerant downstream of the one-way valve from flowing in reverse. When the low-temperature compressor 41 is operating, the temperature of the low-temperature evaporator 44 is very low. Since the distance between the third evaporator 36 and the low-temperature evaporator 44 is relatively close, the pipe temperature of the third evaporator 36 is also relatively low, and may even be significantly lower than the temperature of other evaporators located downstream of the third evaporator 36 in the high-temperature refrigeration cycle 30. The valve can prevent the first refrigerant in other cooling evaporators located downstream of the third evaporator 36 from flowing into the third evaporator 36 from the discharge port of the third evaporator 36, thereby preventing the first refrigerant in the high-temperature refrigeration cycle 30 from flowing in reverse, ensuring the effective circulation of the first refrigerant, and improving the overall refrigeration efficiency.

[0070] Taking R600a as an example, when the refrigerant temperature is -50°C, the pressure is approximately 0.017 MPa, while the suction pressure of the R600a compressor is approximately 0.06 MPa. The pressure on the third evaporator 36 side is lower than the suction pressure of the high-temperature compressor 31, causing the high-temperature refrigeration circuit to gradually accumulate within the third evaporator 36, gradually reducing the refrigerant in the high-temperature refrigeration circuit and causing poor cooling. A one-way valve prevents refrigerant from flowing back and accumulating in the third evaporator 36, causing poor cooling. This one-way valve eliminates the need for a control program to adjust the valve body, solving the problem of refrigerant accumulation caused by low temperatures. It features a simple structure and strong operability.

[0071] like Figure 2 As shown, the high temperature stage condensing device 32 may include a condenser and an anti-dew pipe. The inlet of the high temperature stage condensing device 32 is connected to the outlet of the high temperature stage compressor 31, and the outlet of the heat absorption pipe section 310 is connected to the inlet of the high temperature stage compressor 31. Figure 3 As shown, the outlet of the first evaporator 35 is connected to the inlet of the high temperature stage compressor 31. Figure 2 and Figure 3As shown, the outlet of the low-temperature stage compressor 41 is connected to the inlet of the second low-temperature stage condenser 46, the outlet of the second low-temperature stage condenser 46 is connected to the inlet of the heat release pipe section 410, the outlet of the heat release pipe section 410 is connected to the inlet of the first low-temperature stage condenser 42, the outlet of the first low-temperature stage condenser 42 is connected to the low-temperature stage throttling device 43, the outlet of the low-temperature stage throttling device 43 is connected to the inlet of the low-temperature stage evaporator 44, and the outlet of the low-temperature stage evaporator 44 is connected to the inlet of the low-temperature stage compressor 41 through the heat absorption return air pipe section.

[0072] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A refrigeration and freezing device, comprising a refrigeration system, characterized in that: The refrigeration system includes a high-temperature refrigeration cycle loop and a low-temperature refrigeration cycle loop; The high-temperature refrigeration cycle includes a first throttling device, a heat-absorbing pipe section, and a first evaporator for absorbing heat; the low-temperature refrigeration cycle includes a first low-temperature condenser and a low-temperature evaporator for absorbing heat, and the first low-temperature condenser is thermally connected to the first evaporator; The heat absorbing pipe section is arranged between the outlet of the first throttling device and the inlet of the first evaporator, or the inlet of the heat absorbing pipe section is connected to the outlet of the first evaporator; The heat absorbing pipe section is thermally connected to the first throttling device, so that the refrigerant flowing through the heat absorbing pipe section and the refrigerant flowing through the first throttling device perform heat exchange; The high-temperature refrigeration cycle further includes a second evaporator for absorbing heat; the second evaporator is arranged between the outlet of the first throttling device and the inlet of the first evaporator, and the inlet of the heat-absorbing pipe section is connected to the outlet of the first evaporator; or the second evaporator is arranged between the outlet of the first throttling device and the inlet of the heat-absorbing pipe section, and the heat-absorbing pipe section is arranged between the outlet of the second evaporator and the inlet of the first evaporator; The refrigerator-freezer further includes a housing, wherein a second storage compartment and a first refrigeration compartment located behind the second storage compartment are provided in the housing; the first refrigeration compartment is provided with the first evaporator and an air supply fan; the first refrigeration compartment is connected to the second storage compartment via a first air supply duct structure; the first evaporator and the second evaporator are both used to provide cooling for the second storage compartment.

2. The refrigerator-freezer according to claim 1, wherein: The low-temperature refrigeration cycle loop also includes a heat release pipe section, a low-temperature throttling device and a heat absorption return pipe section; The outlet of the heat release pipe section is connected to the inlet of the first low-temperature stage condenser; The low-temperature stage throttling device is arranged between the outlet of the first low-temperature stage condenser and the inlet of the low-temperature stage evaporator; The inlet of the heat-absorbing return air pipe section is connected to the outlet of the low-temperature stage evaporator; The heat absorbing return air pipe section is thermally connected to the heat releasing pipe section, and / or the heat absorbing return air pipe section is thermally connected to the low temperature stage throttling device.

3. The refrigerator-freezer according to claim 2, wherein: The heat absorption return air pipe section includes a first heat exchange section and a second heat exchange section connected in series, the first heat exchange section is arranged between the low-temperature stage evaporator and the second heat exchange section, the second heat exchange section is thermally connected to the heat release pipe section, and the first heat exchange section is thermally connected to the low-temperature stage throttling device.

4. The refrigerator-freezer according to claim 2, wherein: The low-temperature refrigeration cycle includes a second low-temperature condenser, and the inlet of the heat release pipe section is connected to the outlet of the second low-temperature condenser.

5. The refrigerator-freezer according to claim 1, wherein: The first evaporator and the first low-temperature stage condenser are an integral structure.

6. The refrigerator-freezer according to claim 1 or 5, characterized in that: A first storage compartment is further provided in the box; the low-temperature evaporator is used for providing cooling for the first storage compartment.

7. The refrigerator-freezer according to claim 5, characterized in that: The first evaporator includes a first cooling evaporation tube, the first low-temperature stage condenser includes a condensation tube, and the first cooling evaporation tube and the condensation tube are arranged on the same fin group; The first evaporator is arranged on the upper side of the first low-temperature stage condenser or on one side of the first low-temperature stage condenser in the horizontal direction; The total length of the first cooling evaporation tube is 1.5 to 2 times the total length of the condenser tube.

8. The refrigerator-freezer according to claim 1, wherein: The device further comprises a box body, wherein a first storage compartment is provided in the box body; the low-temperature evaporator is used to provide cooling for the first storage compartment; The high-temperature refrigeration cycle includes a third evaporator for absorbing heat, and the third evaporator is used to provide cooling for the first storage compartment; The third evaporator and the low-temperature stage evaporator are an integral structure; the third evaporator includes a second cooling evaporation tube, and the low-temperature stage evaporator includes a third cooling evaporation tube, and the second cooling evaporation tube and the third cooling evaporation tube are arranged on the same fin group.

9. The refrigerator-freezer according to claim 6, wherein: A third storage compartment is also provided in the box; The high-temperature refrigeration cycle includes a control valve, a second throttling device, a third throttling device, and a third evaporator and a fourth evaporator for absorbing heat. The third evaporator is used to provide cooling for the first storage compartment; the fourth evaporator is used to provide cooling for the third storage compartment. The control valve has a first outlet, a second outlet, and a third outlet. The inlet of the first evaporator is connected to the first outlet through the first throttling device, and the inlet of the third evaporator is connected to the second outlet through the second throttling device; the outlet of the third evaporator is connected to the inlet of the first evaporator; the inlet of the fourth evaporator is connected to the third outlet through the third throttling device, and the outlet of the fourth evaporator is connected to the inlet of the first evaporator; The outlet pipe of the third evaporator is provided with a valve that only allows the refrigerant from the third evaporator to flow out in one direction; The heat absorbing pipe section is also thermally connected to the second throttling device, and / or the heat absorbing pipe section is thermally connected to the third throttling device.

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