Refrigeration system and refrigeration device

Abstract

The application discloses a refrigeration system and a refrigeration device, and belongs to the refrigeration field. The refrigeration system comprises a first refrigeration cycle and a second refrigeration cycle. The first refrigeration cycle comprises a first compressor, a first condenser group, a first path of a heat exchanger, a first path of an evaporative condenser and a second path of the heat exchanger which are sequentially connected in sequence. The second refrigeration cycle comprises a second compressor, a first path of a regenerator, a second path of the evaporative condenser, a second capillary tube, a second evaporator and a second path of the regenerator which are sequentially connected in sequence. In the height direction, the second path inlet of the regenerator is higher than the second evaporator outlet, and the first pipeline connected between the second path inlet of the regenerator and the second evaporator outlet is provided with at least one arc-shaped section. The application can improve the refrigeration effect by arranging the first pipeline connected between the second path inlet of the regenerator and the second evaporator outlet with at least one arc-shaped section.

Description

Technical Field

[0001] This application belongs to the field of refrigeration technology, and in particular relates to a refrigeration system and refrigeration equipment. Background Technology

[0002] As living standards improve, people's demand for refrigeration equipment is gradually increasing. However, existing refrigeration equipment cannot meet people's growing refrigeration needs and needs to be improved. Summary of the Invention

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a refrigeration system and refrigeration equipment, which improves the refrigeration effect by providing at least one arc-shaped section in the first pipe connecting the second inlet of the regenerator and the outlet of the second evaporator.

[0004] In a first aspect, this application provides a refrigeration system, including: a first refrigeration cycle and a second refrigeration cycle;

[0005] The first refrigeration cycle includes a first compressor, a first condenser group, a first path of heat exchangers, a first path of evaporative condensers, and a second path of heat exchangers connected in sequence.

[0006] The second refrigeration cycle includes a second compressor, a first path of a regenerator, a second path of the evaporator-condenser, a second capillary tube, a second evaporator, and a second path of the regenerator, which are connected in sequence.

[0007] In the vertical direction, the second inlet of the regenerator is higher than the outlet of the second evaporator, and the first pipe connecting the second inlet of the regenerator and the outlet of the second evaporator is provided with at least one arc-shaped section.

[0008] According to the refrigeration system of this application, the first pipe connecting the second inlet of the regenerator and the outlet of the second evaporator is provided with at least one arc-shaped section. The arc-shaped section design can reduce the flow resistance of the refrigerant, and at the same time shorten the straight section length of the first pipe, reducing the friction resistance. The accumulated liquid can flow back to the second evaporator along the first pipe according to the gravitational potential energy. As the accumulated refrigerant decreases, it is pushed out of the accumulation section by the refrigerant. The refrigerant mass flow rate in the second refrigeration cycle increases, the cooling capacity of the second refrigeration cycle increases, the inlet temperature of the second evaporator decreases, and the outlet temperature of the second evaporator increases. At the same time, the evaporator and condenser experience a liquid shortage, the return gas temperature of the second path of the heat exchanger increases, and the actual temperature inside the refrigeration equipment begins to decrease, thereby improving the refrigeration effect.

[0009] According to one embodiment of this application, the first pipeline includes multiple segments connected sequentially and arranged along the height direction, with an arc-shaped segment provided between each adjacent segment.

[0010] According to one embodiment of this application, the first pipeline includes a first section, a second section, and a third section connected in sequence. The first section and the third section extend laterally and are spaced apart vertically. The end of the first section away from the second end is connected to the outlet of the second evaporator, and the end of the third section away from the second section is connected to the second inlet of the regenerator. Arc-shaped sections are provided between the second section and the first section, and between the second section and the third section.

[0011] According to one embodiment of this application, the evaporator-condenser includes: a third serpentine tube section, the third serpentine tube section including a first serpentine section and a second serpentine section connected along the height direction, the two ends of the first serpentine section opposite to the second serpentine section being respectively connected to the second inlet of the heat exchanger and the first outlet of the regenerator, and the two ends of the second serpentine section opposite to the first serpentine section being respectively connected to the first outlet of the heat exchanger and the inlet of the second capillary tube;

[0012] Wherein, the first serpentine segment has a lateral width greater than the second serpentine segment, the first pipeline is located below the first serpentine segment in the vertical direction, the first segment and the second segment are located on one side of the second serpentine segment in the horizontal direction, and the third segment is located below the second serpentine segment in the vertical direction.

[0013] According to one embodiment of this application, the evaporator and the heat exchanger are distributed laterally, and the end of the second serpentine segment facing the heat exchanger is laterally shorter than the end of the first serpentine segment facing the heat exchanger. The first segment and the second segment are located on the side of the second serpentine segment facing the heat exchanger.

[0014] According to one embodiment of this application, the regenerator includes a second serpentine tube segment, the second serpentine tube segment and the third serpentine tube segment are distributed laterally, the vertical height of the third serpentine tube segment is greater than the vertical height of the second serpentine tube segment, and the first pipeline and the second serpentine tube segment are distributed vertically.

[0015] According to one embodiment of this application, the regenerator further includes a second connecting section, the two ports of the second connecting section opposite to the second serpentine tube section being respectively connected to the inlet and outlet of the second compressor, and the two ports of the second connecting section opposite to the second serpentine tube section being spaced apart from the first pipeline.

[0016] According to one embodiment of this application, the heat exchanger and the regenerator are stacked at a distance from each other along the thickness direction.

[0017] According to one embodiment of this application, the heat exchanger is arranged outside the regenerator.

[0018] According to one embodiment of this application, the first refrigeration cycle further includes a liquid receiver disposed between the first path of the evaporator-condenser and the second path of the heat exchanger.

[0019] According to one embodiment of this application, along the height direction of the reservoir, the outlet of the reservoir is higher than the inlet of the reservoir.

[0020] Secondly, this application provides a refrigeration device, including a refrigeration system as described in any of the above embodiments.

[0021] According to the refrigeration equipment of this application, by setting up the refrigeration system described in any of the above embodiments, the first pipe connecting the second inlet of the regenerator and the outlet of the second evaporator of the refrigeration system is provided with at least one arc-shaped section. The arc-shaped section design can reduce the flow resistance of the refrigerant, and at the same time shorten the straight section length of the first pipe, reducing the friction resistance. The accumulated liquid can flow back to the second evaporator along the first pipe according to the gravitational potential energy. As the accumulated refrigerant decreases, it is pushed out of the accumulation section by the refrigerant. The refrigerant mass flow rate in the second refrigeration cycle increases, the cooling capacity of the second refrigeration cycle increases, the inlet temperature of the second evaporator decreases, and the outlet temperature of the second evaporator increases. At the same time, the evaporator and condenser experience a similar liquid shortage, the return gas temperature of the second path of the heat exchanger increases, and the actual temperature inside the refrigeration equipment begins to decrease, thereby improving the refrigeration effect.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is one of the structural schematic diagrams of the refrigeration system provided in the embodiments of this application;

[0025] Figure 2 This is a second schematic diagram of the refrigeration system provided in the embodiments of this application;

[0026] Figure 3 This is the third schematic diagram of the refrigeration system provided in the embodiments of this application;

[0027] Figure 4 This is the fourth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0028] Figure 5 This is the fifth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0029] Figure 6 This is the sixth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0030] Figure 7 This is the seventh schematic diagram of the refrigeration system provided in the embodiments of this application;

[0031] Figure 8 This is the eighth schematic diagram of the refrigeration system provided in the embodiments of this application.

[0032] Figure label:

[0033] First refrigeration cycle 1, first compressor 11, first condenser group 12, wire tube condenser 121, shroud condenser 122, heat exchanger 13, first path of heat exchanger 131, second path of heat exchanger 132, first serpentine tube section 133, first connecting section 134, evaporator condenser 14, first path of evaporator condenser 141, second path of evaporator condenser 142, third serpentine tube section 143, first serpentine section 1431, second serpentine section 1432, third connecting section 144, liquid receiver 15, first dryer filter 16;

[0034] Second refrigeration cycle 2, second compressor 21, regenerator 22, first path of regenerator 221, second path of regenerator 222, second serpentine tube section 223, second connecting section 224, first sub-section 2241, second sub-section 2242, third sub-section 2243, second capillary tube 23, second evaporator 24, second dryer filter 25, second condenser 26, first pipeline 27, arc section 271, first section 272, second section 273, third section 274. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] The following is for reference. Figures 1-8 This application describes a refrigeration system and refrigeration equipment according to embodiments thereof. The refrigeration system is used to refrigerate the storage space of the refrigeration equipment.

[0037] It should be noted that the refrigeration equipment in this embodiment can be understood as a broad refrigeration storage device, including but not limited to refrigerators, freezers, display cases, beverage cabinets, wine cabinets, refrigerated display cases, and refrigerated vending machines. Refrigeration equipment has diverse structural forms and a wide range of applications.

[0038] The refrigeration equipment includes a cabinet and a door. The cabinet includes an outer shell, an inner liner, and an insulation layer located between the outer shell and the inner liner. The outer shell covers the inner liner and provides protection. The insulation layer can be a foam layer, which provides insulation and cushioning. The space between the outer shell and the inner liner forms a compartment for housing machines such as compressors and circuit breakers.

[0039] like Figure 6 and Figure 7 As shown, the refrigeration system in this embodiment includes a first refrigeration cycle 1 and a second refrigeration cycle 2. The refrigerants in the first refrigeration cycle 1 and the second refrigeration cycle 2 have different boiling points in order to reduce subcooling.

[0040] The first refrigeration cycle 1 includes a first compressor 11, a first condenser group 12, a first heat exchanger 131, a first evaporator condenser 141, and a second heat exchanger 132 connected in sequence. The first heat exchanger 131 can be a first capillary tube.

[0041] The heat exchanger exchanges heat between the first path 131 and the second path 132, which can increase the temperature of the refrigerant entering the first compressor 11 and decrease the temperature of the refrigerant entering the first path 141 of the evaporator-condenser. This allows for the recovery and utilization of the waste heat of the heat exchange medium, thereby improving the cooling effect and reducing cooling energy consumption.

[0042] The first condenser group 12 may include at least one condenser, which is used to condense and cool the high-temperature and high-pressure superheated steam discharged from the first compressor 11.

[0043] The second refrigeration cycle 2 includes a second compressor 21 connected end to end, a first path 221 of the regenerator, a second path 142 of the evaporator-condenser, a second capillary tube 23, a second evaporator 24, and a second path 222 of the regenerator connected in sequence.

[0044] The second capillary tube 23 is used to throttle and reduce the pressure of the refrigerant from the second outlet of the evaporator-condenser 14 to obtain a lower evaporation temperature, such as below -60°C. The whole process is a cooling and depressurization process.

[0045] like Figure 2 and Figure 5 As shown, the working principle of the first refrigeration cycle 1 is as follows: The refrigerant is compressed into a high-temperature, high-pressure gas in the first compressor 11, enters the first condenser group 12 and condenses into a high-pressure liquid. Then, after being throttled and depressurized by the first capillary tube in the heat exchanger 13, it enters the first path 141 of the evaporator-condenser for evaporation. The refrigerant absorbs heat and produces a cooling effect. The refrigerant gas produced by evaporation exchanges heat with the refrigerant in the second refrigeration cycle 2 in the evaporator-condenser 14. Finally, the refrigerant heated by the first capillary tube is transported to the first compressor 11 through the return gas pipe group of the second path 132 of the heat exchanger.

[0046] like Figure 2 and Figure 6 As shown, the working principle of the second refrigeration cycle 2 is as follows: The refrigerant is compressed into a high-temperature, high-pressure gas in the second compressor 21, and enters the first path 221 of the regenerator to exchange heat with the second path 222 (the return gas pipe of the second compressor 21) of the regenerator, thus being cooled. Then, it enters the second path 142 of the evaporator-condenser to exchange heat with the refrigerant in the first refrigeration cycle 1 and condenses. The condensed refrigerant is then throttled and depressurized through the second capillary tube 23 before entering the second evaporator 24 to evaporate, achieving a cooling effect. Finally, it returns to the second compressor 21 through the second path 222 of the regenerator to recover heat.

[0047] Along the height direction, the inlet of the second path 222 of the regenerator is higher than the outlet of the second evaporator 24. When the liquid refrigerant flows from the outlet of the second evaporator 24 to the inlet of the second path 222 of the regenerator, it needs to overcome a certain gravitational potential energy. The liquid refrigerant may flow back to the second evaporator 24, reducing the accumulation of liquid refrigerant in the first pipe 27. This can reduce the accumulation of two-phase refrigerant liquid discharged from the outlet of the second evaporator 24 and reduce the refrigerant flow resistance.

[0048] Among them, such as Figure 4 As shown, the first pipe 27 connecting the second inlet of the regenerator 222 and the outlet of the second evaporator 24 is provided with at least one arc-shaped section 271. The arc-shaped section 271 can be provided at all bends of the first pipe 27, or it can be provided only at some bends.

[0049] The design of the arc section 271 can reduce the flow resistance of the refrigerant. Under low temperature operation, the outlet pressure of the second evaporator 24 is low. The first pipe 27 connecting the inlet of the second path 222 of the regenerator and the outlet of the second evaporator 24 is set as a riser pipe. The accumulated liquid can flow back to the second evaporator 24 along the first pipe 27 according to the gravitational potential energy. The design of a large arc can reduce local flow resistance, improve flow efficiency, and reduce turbulence and pressure drop. In addition, the arc section 271 can also play a buffering role, reducing the impact and vibration of the refrigerant at the pipe connection, reducing noise, thereby improving the stability and reliability of the system.

[0050] In related technologies, the first pipe 27 connecting the second inlet of the regenerator 222 and the outlet of the second evaporator 24 is set as a right-angle transition, resulting in greater local resistance. Simultaneously, the first pipe 27 is quite long. During cooling, the heat load required by the second refrigeration cycle 2 decreases, and two-phase refrigerant appears at the outlet of the second evaporator 24. This two-phase refrigerant tends to accumulate at the lowest and bend of the heat exchange pipe, easily causing blockage in the heat exchange pipe between the outlet of the second evaporator 24 and the second inlet of the regenerator 22. Gaseous refrigerant cannot quickly pass through the heat exchange pipe into the regenerator 22 and the second compressor 21, leading to a decrease in the mass flow rate of the low-temperature refrigerant. This results in a decrease in the cooling capacity provided by the second refrigeration cycle 2, an increase in the inlet temperature of the second evaporator 24, and a decrease in the temperature of the second evaporator 24 due to the evaporation effect of the second compressor 21. The heat in the second condenser 26 decreases, corresponding to the liquid passing through the evaporator-condenser 14, and a decrease in the return gas temperature. In reality, the temperature inside the refrigeration equipment either rises or stops decreasing.

[0051] The refrigeration system provided in this application embodiment has at least one arc-shaped section 271 in the first pipe 27 connecting the inlet of the second path 222 of the regenerator and the outlet of the second evaporator 24. The design of the arc-shaped section 271 can reduce the flow resistance of the refrigerant, and at the same time shorten the straight section length of the first pipe 27, reducing the friction resistance. The accumulated liquid can flow back to the second evaporator 24 along the first pipe 27 according to the gravitational potential energy. As the accumulated refrigerant decreases, it is pushed out of the accumulation section by the refrigerant. The refrigerant mass flow rate in the second refrigeration cycle 2 increases, the cooling capacity of the second refrigeration cycle 2 increases, the inlet temperature of the second evaporator 24 decreases, and the outlet temperature of the second evaporator 24 increases. At the same time, the evaporator condenser 14 experiences a liquid shortage, the return gas temperature of the second path of the heat exchanger 13 increases, and the actual temperature inside the refrigeration equipment begins to decrease, thereby improving the refrigeration effect.

[0052] In some embodiments, such as Figure 4 As shown, the first pipe 27 includes multiple segments connected sequentially and arranged along the height direction. The multiple segments of the first pipe 27 can accommodate the height difference between the inlet of the second path 222 of the regenerator connected at both ends of the first pipe 27 and the outlet of the second evaporator 24. An arc-shaped segment 271 is provided between adjacent segments. The design of the arc-shaped segment 271 can reduce the flow resistance of the refrigerant, while shortening the length of the straight section of the first pipe 27, reducing the friction resistance and improving the cooling effect.

[0053] In some embodiments, such as Figure 4 As shown, the first pipeline 27 includes a first section 272, a second section 273 and a third section 274 connected in sequence. The end of the first section 272 away from the second end is connected to the outlet of the second evaporator 24.

[0054] The first segment 272 and the third segment 274 are distributed vertically and spaced apart. The two ends of the second segment 273 are connected to the first segment 272 and the third segment 274 respectively. The second segment 273 can extend vertically or obliquely on the vertical plane. The extension direction of the second segment 273 can be seen from the horizontal spacing between the first segment 272 and the third segment 274. The second segment 273 has a different height to connect the first segment 272 and the third segment 274 at different heights. The first segment 272 and the third segment 274 are spaced apart along the height direction to connect the inlet of the second path 222 of the regenerator, which is set vertically and spaced apart, with the outlet of the second evaporator 24.

[0055] The third section 274, which is away from the second section 273, is connected to the second inlet 222 of the regenerator.

[0056] The first section 272 and the third section 274 extend laterally and are used to connect the inlet of the second path 222 of the regenerator, which is arranged laterally at intervals, to the outlet of the second evaporator 24.

[0057] Arc-shaped sections 271 are provided between the second section 273 and the first section 272, and between the second section 273 and the third section 274. The design of the arc-shaped sections 271 can reduce the flow resistance of the refrigerant, while shortening the straight section length of the first pipe 27, reducing friction resistance and improving the cooling effect. Furthermore, the first pipe 27 can achieve vertical and horizontal extension changes through the three-section setting, with fewer bends and reduced friction resistance.

[0058] In some embodiments, such as Figure 4 As shown, the curvature center of the arc segment 271 between the second segment 273 and the first segment 272 and the curvature center of the arc segment 271 between the second segment 273 and the third segment 274 are respectively located on both sides of the second segment 273, that is, the first pipe 27 is Z-shaped, which allows the two ends of the first pipe 27 to be spaced apart in both the horizontal and vertical directions.

[0059] In some embodiments, such as Figure 3 As shown, the evaporator-condenser 14 includes a third serpentine tube section 143 and a third connecting section 144. The two ports of the third serpentine tube section 143 facing away from the third connecting section 144 are respectively connected to the outlet of the second dryer filter 25 and the outlet of the first capillary tube. The two ports of the third serpentine tube section 143 facing away from the third connecting section 144 are respectively the inlet of the first path of the evaporator-condenser 14 and the outlet of the second path of the evaporator-condenser 14.

[0060] The design of the third serpentine tube section 143 can extend the length of the heat exchange tube inside the evaporator-condenser 14, increase the heat exchange area, and thus transfer heat more effectively.

[0061] The third connecting section 144 is located laterally (X-direction) between the third serpentine tube section 143 and the first serpentine tube section 133. Since the evaporator condenser 14 and the heat exchanger 13 are distributed laterally, and the heat exchanger 13 and the regenerator 22 are distributed along the thickness direction, placing the third connecting section 144 between the third serpentine tube section 143 and the first serpentine tube section 133 can facilitate the connection between the evaporator condenser 14 and the heat exchanger 13 and the regenerator 22, and also facilitate the arrangement of the heat exchange pipeline, thereby increasing the compactness of the system.

[0062] In some embodiments, such as Figure 3 and Figure 8 As shown, the third connecting section 144 extends vertically, and the upper end of the third connecting section 144 is connected to the upper end of the third serpentine tube section 143. The two ports at the lower end of the third connecting section 144 are respectively connected to the inlet of the liquid reservoir 15 and the first tube outlet of the regenerator 22.

[0063] The third connecting section 144 extends vertically, meaning that the first path 141 of the evaporator condenser is top-in, bottom-out, and the second path 142 of the evaporator condenser is bottom-in, top-out. Low-temperature, low-pressure liquid refrigerant enters from the bottom inlet of the first path 141 of the evaporator condenser and flows out from the top outlet of the first path 141 of the evaporator condenser. High-temperature, subcooled liquid refrigerant enters from the bottom inlet of the second path 142 of the evaporator condenser and flows out from the top outlet of the second path 142 of the evaporator condenser. This can increase the heat exchange time between the refrigerant in the first path 141 of the evaporator condenser and the refrigerant in the second path 142 of the evaporator condenser, thereby enhancing the heat exchange effect.

[0064] like Figure 3 As shown, the third serpentine tube segment 143 includes a first serpentine segment 1431 and a second serpentine segment 1432 connected along the height direction. The two ends of the first serpentine segment 1431 opposite to the second serpentine segment 1432 are respectively connected to the second inlet 132 of the heat exchanger and the first outlet 221 of the regenerator. The two ends of the second serpentine segment 1432 opposite to the first serpentine segment 1431 are respectively connected to the outlet of the first capillary and the inlet of the second capillary.

[0065] The first serpentine segment 1431 and the second serpentine segment 1432 are distributed along the height direction. The width of the first serpentine segment 1431 in the lateral direction is greater than the width of the second serpentine segment 1432 in the lateral direction. That is, at least one end of the second serpentine segment 1432 in the lateral direction is recessed into the first serpentine segment 1431, so as to avoid specific cooling components.

[0066] The first pipeline 27 is located below the first serpentine section 1431 along the vertical direction, and the first section 272 and the second section 273 are located on one side of the second serpentine section 1432 along the horizontal direction.

[0067] In this embodiment, at least one end of the second serpentine segment 1432 is recessed into the first serpentine segment 1431 in the lateral direction. The second serpentine segment 1432 is used to avoid the first segment 272 and the second segment 273 of the first pipeline 27 in the lateral direction, thereby making reasonable use of space and improving the compactness of the refrigeration system structure.

[0068] The third segment 274 is located below the second serpentine segment 1432 along the height direction, so as to connect with the inlet of the second path 222 of the regenerator with a height difference and the outlet of the second evaporator 24.

[0069] In some embodiments, such as Figure 3 and Figure 5 As shown, the evaporator condenser 14 and the heat exchanger 13 are distributed laterally (X direction). The evaporator condenser 14 and the heat exchanger 13 can be spaced apart in the lateral direction, which can improve space utilization, increase the compactness of the structure, increase the contact area with the inner liner of the refrigeration equipment, and improve the heat exchange effect.

[0070] The end of the second serpentine section 1432 facing the heat exchanger 13 is laterally shorter than the end of the first serpentine section 1431 facing the heat exchanger 13. The first section 272 and the second section 273 are located on the side of the second serpentine section 1432 facing the heat exchanger 13. The second serpentine section 1432 is used to laterally avoid the first section 272 and the second section 273 of the first pipeline 27, thereby making reasonable use of space and improving the compactness of the refrigeration system structure.

[0071] In some embodiments, such as Figure 3 and Figure 8 As shown, the regenerator 22 includes a second serpentine tube section 223. The second serpentine tube section 223 of the regenerator 22 adopts a serpentine design, which can increase the length of the heat exchange pipeline, increase the heat exchange area, and reduce the installation difficulty.

[0072] The second serpentine tube section 223 and the third serpentine tube section 143 are distributed laterally, which can improve space utilization, increase the compactness of the structure, increase the contact area with the inner liner of the refrigeration equipment, and improve the heat exchange effect.

[0073] The vertical height of the third serpentine tube segment 143 is greater than that of the second serpentine tube segment 223. That is, the second serpentine tube segment 223 is recessed vertically into the third serpentine tube segment 143. The first pipe 27 and the second serpentine tube segment 223 are distributed vertically. The second serpentine tube segment 223 is used to avoid the first pipe 27 vertically, thereby making reasonable use of space and improving the compactness of the refrigeration system structure.

[0074] In some embodiments, such as Figure 3 and Figure 8 As shown, the regenerator 22 also includes a second connecting section 224. The two ports of the second connecting section 224 opposite to the second serpentine tube section 223 are respectively connected to the inlet and outlet of the second compressor 21. The high-temperature refrigerant discharged from the outlet of the second compressor 21 exchanges heat with the low-temperature refrigerant entering the second compressor 21, which can recover and utilize the waste heat of the second compressor 21.

[0075] The main function of the regenerator 22 is to use the cooling capacity of the refrigerant saturated vapor from the second evaporator 24 when it needs to be superheated to further subcool the refrigerant before throttling, thereby improving the refrigeration efficiency.

[0076] The second connecting section 224 is spaced apart from the two ports of the second serpentine pipe section 223 and the first pipe 27, so that the second connecting section 224 and the first pipe 27 can be connected to their respective refrigeration components, reducing the difficulty of assembly.

[0077] In some embodiments, a second drying filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23. The pipe connecting the second path 142 of the evaporator and the second drying filter 25 is arranged laterally spaced from the first pipe 27 to make full use of the lateral space and improve the compactness of the structure.

[0078] In some embodiments, such as Figure 8 As shown, the heat exchanger 13 and the regenerator 22 are stacked separately along the thickness direction (Y direction) to improve the utilization rate of the thickness space between the inner tank and the shell of the refrigeration equipment, reduce the difficulty of arranging the heat exchange pipeline, and at the same time, the separate arrangement can reduce the heat interference between the heat exchanger 13 and the regenerator 22 and improve the refrigeration effect.

[0079] A foamed layer can be filled in the gap between the heat exchanger 13 and the regenerator 22 to achieve heat insulation and heat preservation.

[0080] In some embodiments, heat exchanger 13 is arranged outside of regenerator 22.

[0081] Heat exchanger 13 is responsible for facilitating heat exchange between the refrigerant and the external environment, playing a crucial role in the refrigeration system. By arranging heat exchanger 13 outside the regenerator 22, the refrigerant can quickly exchange heat with the external environment through heat exchanger 13 after flowing through the regenerator 22, thereby improving the heat exchange efficiency of the entire refrigeration system.

[0082] The heat exchanger 13 is arranged outside the regenerator 22, while the regenerator 22 is located close to the inner liner of the refrigeration equipment along the thickness direction. This design helps to optimize heat exchange efficiency, improve structural compactness, enhance refrigeration effect, and facilitate maintenance and repair.

[0083] In some embodiments, the first refrigeration cycle 1 further includes a liquid receiver 15 disposed between the first path 141 of the evaporator-condenser and the second path 132 of the heat exchanger.

[0084] In related technologies, when the freezer is in a low ambient temperature (≤16℃), condensation or even ice formation can easily occur in the foamed layer of the second path 132 of the heat exchanger in the first refrigeration cycle 1. This is because the first refrigeration cycle 1 operates at a low ambient temperature, reducing the heat load of the refrigeration equipment and lowering the temperature of the evaporator condenser 14. As a result, the cooling demand of the first refrigeration cycle 1 decreases, and the first path 141 of the evaporator condenser sends the incompletely evaporated liquid refrigerant into the second path 132 of the heat exchanger. However, the second path 132 of the heat exchanger in the first refrigeration cycle 1 is structurally long and cannot exchange heat with the incompletely evaporated liquid refrigerant in time. Therefore, the heat exchange capacity of the second path 132 of the heat exchanger cannot meet all operating conditions.

[0085] In this embodiment, a liquid receiver 15 is provided between the first path 141 of the evaporator condenser and the second path 132 of the heat exchanger. This can collect the liquid refrigerant flowing out of the outlet of the first path 141 of the evaporator condenser, thereby increasing the proportion of gaseous refrigerant entering the second path 132 of the heat exchanger. Through heat exchange between the first path 131 and the second path 132 of the heat exchanger, the refrigerant in the second path 132 of the heat exchanger can be raised to above the ambient temperature, reducing the risk of condensation or frost forming between the first path 141 of the evaporator condenser and the second path 132 of the heat exchanger.

[0086] In some embodiments, such as Figure 3 and Figure 5 As shown, along the height direction (Z direction) of the reservoir 15, the outlet of the reservoir 15 is higher than the inlet of the reservoir 15.

[0087] In this embodiment, the liquid receiver 15 adopts a top-out, bottom-in configuration in the spatial direction. That is, the liquid refrigerant flowing out from the first path of the evaporator-condenser 14 can be stored in the liquid receiver 15, while the gaseous refrigerant flows out from the outlet of the liquid receiver 15 into the second path 132 of the heat exchanger. This increases the proportion of gaseous refrigerant entering the second path of the heat exchanger 13 and reduces the risk of condensation or icing between the first path outlet of the evaporator-condenser 14 and the second path inlet of the heat exchanger 13.

[0088] In some embodiments, such as Figure 3 and Figure 5 As shown, along the height direction (Z direction) of the evaporator 14, the first outlet of the evaporator 141 is located above the first inlet of the evaporator 141.

[0089] In this embodiment, the first path 141 of the evaporator condenser adopts a bottom-in, top-out structure, which can improve the uniformity of heat exchange between the first path 141 and the second path of the evaporator condenser. The refrigerant can absorb heat and gradually evaporate, which can reduce the proportion of liquid refrigerant entering the liquid receiver 15. Excess liquid refrigerant is stored in the liquid receiver 15, which further increases the proportion of gaseous refrigerant entering the second path of the heat exchanger 13, reducing the risk of condensation or icing between the first path outlet of the evaporator condenser 14 and the second path inlet of the heat exchanger 13.

[0090] In some embodiments, such as Figure 3 and Figure 5 As shown, the evaporator condenser 14 and the heat exchanger 13 are distributed laterally (X direction), and the liquid receiver 15 is arranged between the evaporator condenser 14 and the heat exchanger 13, which facilitates the arrangement of the pipeline between the first outlet of the evaporator condenser 14 and the inlet of the liquid receiver 15, as well as the pipeline between the outlet of the liquid receiver 15 and the second inlet of the heat exchanger 13.

[0091] The evaporator condenser 14 and the heat exchanger 13 can be spaced apart in the transverse direction to increase the contact area with the inner liner of the refrigeration equipment and improve the heat exchange effect.

[0092] The outlet of the receiver 15 is higher than the inlet of the receiver 15, which allows the liquid refrigerant to remain in the receiver 15 and the gaseous refrigerant to be discharged from the outlet of the receiver 15, thereby reducing the proportion of liquid refrigerant discharged from the receiver 15.

[0093] The outlet of the first path 141 of the evaporator condenser is higher than the inlet of the liquid receiver 15. The outlet of the first path 141 of the evaporator condenser is connected to the inlet of the liquid receiver 15 through a downwardly extending pipe, which facilitates the flow of liquid refrigerant from the first path 141 of the evaporator condenser into the liquid receiver 15, reduces the liquid refrigerant residue at the outlet of the first path 141 of the evaporator condenser, reduces the liquid refrigerant residue in the pipe, and reduces the risk of condensation or icing.

[0094] The outlet of the liquid receiver 15 is higher than the inlet of the second path 132 of the heat exchanger. The outlet of the liquid receiver 15 is connected to the inlet of the second path 132 of the heat exchanger through a downwardly extending pipe. This can reduce the proportion of liquid refrigerant discharged from the liquid receiver 15, increase the amount of liquid refrigerant remaining in the pipe, thereby increasing the proportion of gaseous refrigerant entering the liquid receiver 15, improving the cooling effect, and reducing the risk of condensation or icing.

[0095] In some embodiments, such as Figure 6 As shown, the regenerator 22 and the evaporator-condenser 14 are arranged laterally (X-direction) to improve the utilization of lateral space.

[0096] The outlet of the first path 221 of the regenerator is longitudinally lower than the inlet of the second path 142 of the evaporator-condenser to reduce the proportion of liquid refrigerant entering the second path 142 of the evaporator-condenser.

[0097] In some embodiments, such as Figure 3 and Figure 8 As shown, the heat exchanger 13 includes a first serpentine tube section 133 and a first connecting section 134. The first serpentine tube section 133 of the heat exchanger 13 adopts a serpentine design, which can increase the length of the heat exchange pipeline, increase the heat exchange area, and improve the heat exchange efficiency. The refrigerant or other heat exchange medium flows inside the first serpentine tube section 133. Through heat exchange with the external environment, the first serpentine tube section 133 can achieve cooling or other functions, reducing the difficulty of installation.

[0098] The two ports of the first connecting section 134, which are away from the first serpentine tube section 133, are respectively connected to the inlet of the first compressor 11 and the outlet of the first condenser group 12. The high-temperature refrigerant discharged from the outlet of the first condenser group 12 exchanges heat with the low-temperature refrigerant to be entered into the first compressor 11, which can increase the temperature of the refrigerant entering the first compressor 11, further reduce the temperature of the refrigerant in the first capillary tube, and improve the cooling effect.

[0099] The first serpentine tube segment 133 and the second serpentine tube segment 223 are stacked at intervals along the thickness direction, which can improve the utilization rate of the thickness space between the inner liner and the shell of the refrigeration equipment, reduce the difficulty of arranging the heat exchange pipeline, and at the same time, the stacking method also helps to reduce heat loss and improve the energy efficiency of the entire refrigeration system.

[0100] The two ports of the first connecting section 134 opposite to the first serpentine tube section 133 and the two ports of the second connecting section 224 opposite to the second serpentine tube section 223 are laterally spaced apart, which facilitates the installation of the first connecting section 134 and the second connecting section 224 with other refrigeration devices, reduces the installation difficulty, and improves the smoothness and stability of the refrigerant during the flow process.

[0101] The bending angles and lengths of at least a portion of the first serpentine pipe segment 133 and the second serpentine pipe segment 223 can correspond, so that a single pipe support can be used to fix the first serpentine pipe segment 133 and the second serpentine pipe segment 223 simultaneously, reducing the difficulty of installation.

[0102] The shapes and lengths of at least a portion of the first connecting section 134 and the second connecting section 224 can correspond to each other, so as to use a single pipe rack to fix the first connecting section 134 and the second connecting section 224 simultaneously, thereby reducing the difficulty of installation.

[0103] In some embodiments, such as Figure 3 and Figure 8As shown, the first connecting section 134 extends vertically, and the upper end of the first connecting section 134 is connected to the upper end of the first serpentine tube section 133. The two ports at the lower end of the first connecting section 134 are respectively connected to the inlet of the first compressor 11 and the outlet of the first condenser group 12.

[0104] The first connecting section 134 extends vertically. The refrigerant in the first path 131 (first capillary tube) of the heat exchanger in the first connecting section 134 flows from bottom to top. The high-pressure subcooled liquid refrigerant flowing out from the first condenser group 12 flows from bottom to top along the first capillary tube. The refrigerant in the second path 132 of the heat exchanger flows from top to bottom. The low-temperature, low-pressure gaseous refrigerant discharged from the evaporator condenser 14 flows from top to bottom in the second path 132 of the heat exchanger. This can increase the heat exchange time between the refrigerant in the first path 131 of the heat exchanger and the refrigerant in the second path 132 of the heat exchanger, thereby enhancing the heat exchange effect.

[0105] The second connecting section 224 includes a first sub-section 2241, a second sub-section 2242, and a third sub-section 2243 connected in sequence. The first sub-section 2241 extends vertically, and the upper end of the first sub-section 2241 is connected to the upper end of the second serpentine tube section 223. After the refrigerant completes heat exchange in the regenerator 22, it can flow out smoothly through the first sub-section 2241.

[0106] The second sub-segment 2242 extends laterally, connecting the lower end of the first sub-segment 2241 and the upper end of the third sub-segment 2243. The design of the second sub-segment 2242 creates a bend in the second connecting segment 224 in space, which helps to save space and optimize the overall layout.

[0107] The third segment 2243 extends along the vertical plane. The third segment 2243 can extend vertically or obliquely within the vertical plane. The upper end of the third segment 2243 is connected to the second segment 2242, and the two ports at the lower end of the third segment 2243 are respectively connected to the inlet and outlet of the second compressor 21. After the refrigerant is subcooled in the regenerator 22, it can enter the compressor through the third segment 2243 for the next round of compression.

[0108] In this design, the lower end of the first connecting section 134 and the lower end of the third sub-section 2243 are laterally spaced. This design allows the heat exchanger 13 and the regenerator 22 to be arranged independently in space, reducing mutual interference. Simultaneously, the first connecting section 134 and the first sub-section 2241 are stacked at intervals along the thickness direction, further saving space and improving the overall structural compactness. This design also facilitates the maintenance and repair of the heat exchanger 13 and the regenerator 22. Because the spatial layout of the connecting sections is clear and easy to understand, maintenance personnel can easily locate and access the components requiring repair or replacement.

[0109] In some embodiments, such as Figure 1 and Figure 5 As shown, the first condenser group 12 includes a wire tube condenser 121 and a baffle plate condenser 122 connected in sequence.

[0110] The wire tube condenser 121 and the baffle condenser 122 are located in different areas of the refrigeration equipment. The wire tube condenser 121 typically includes a series of small tubes designed to allow refrigerant vapor to flow through while an external cooling medium (such as water or air) flows through to remove the heat from the refrigerant vapor, thereby condensing it into a liquid.

[0111] The condenser 122 has a larger surface area for more efficient heat exchange. The condenser 122 is typically designed as one or more plates between which the refrigerant flows, while an external cooling medium flows over the outside of the plates to remove heat.

[0112] The wire-tube condenser 121 and the baffle condenser 122 are connected sequentially, meaning that the refrigerant vapor first enters the wire-tube condenser 121 for initial condensation, and then flows out and enters the baffle condenser 122 for further condensation. This sequential connection allows the refrigerant vapor to undergo sufficient heat exchange before completely condensing into a liquid, thus improving the cooling effect.

[0113] A first dryer filter 16 is provided between the enclosure condenser 122 and the first capillary tube. The first dryer filter 16 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the first capillary tube, thereby reducing the risk of blockage of the first capillary tube.

[0114] A second dryer filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23. The second dryer filter 25 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the second capillary tube 23, thereby reducing the risk of blockage of the second capillary tube 23.

[0115] A second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator. The second condenser 26 can be installed in different areas of the refrigeration equipment. For example, the second condenser 26 can be installed at the back of the refrigeration equipment. The second condenser 26 can condense the high-temperature and high-pressure superheated gas flowing out of the outlet of the second compressor 21 into a high-pressure subcooled liquid.

[0116] In some embodiments, the first condenser group 12 includes a wire tube condenser 121 and a baffle condenser 122 connected in sequence, and a first drying filter 16 is provided between the baffle condenser 122 and the first capillary tube; a second drying filter 25 is provided between the second path 142 of the evaporator condenser and the second capillary tube 23.

[0117] The wire tube condenser 121 and the baffle condenser 122 are located in different areas of the refrigeration equipment. The wire tube condenser 121 typically includes a series of small tubes designed to allow refrigerant vapor to flow through while an external cooling medium (such as water or air) flows through to remove the heat from the refrigerant vapor, thereby condensing it into a liquid.

[0118] The condenser 122 has a larger surface area for more efficient heat exchange. The condenser 122 is typically designed as one or more plates between which the refrigerant flows, while an external cooling medium flows over the outside of the plates to remove heat.

[0119] The wire-tube condenser 121 and the baffle condenser 122 are connected sequentially, meaning that the refrigerant vapor first enters the wire-tube condenser 121 for initial condensation, and then flows out and enters the baffle condenser 122 for further condensation. This sequential connection allows the refrigerant vapor to undergo sufficient heat exchange before completely condensing into a liquid, thus improving the cooling effect.

[0120] A first dryer filter 16 is provided between the enclosure condenser 122 and the first capillary tube. The first dryer filter 16 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the first capillary tube, thereby reducing the risk of blockage of the first capillary tube.

[0121] A second dryer filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23. The second dryer filter 25 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the second capillary tube 23, thereby reducing the risk of blockage of the second capillary tube 23.

[0122] In some embodiments, the first condenser group 12 includes a wire tube condenser 121 and a baffle condenser 122 connected in sequence, and a first drying filter 16 is provided between the baffle condenser 122 and the first capillary tube; a second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator.

[0123] The wire tube condenser 121 and the baffle condenser 122 are located in different areas of the refrigeration equipment. The wire tube condenser 121 typically includes a series of small tubes designed to allow refrigerant vapor to flow through while an external cooling medium (such as water or air) flows through to remove the heat from the refrigerant vapor, thereby condensing it into a liquid.

[0124] The condenser 122 has a larger surface area for more efficient heat exchange. The condenser 122 is typically designed as one or more plates between which the refrigerant flows, while an external cooling medium flows over the outside of the plates to remove heat.

[0125] The wire-tube condenser 121 and the baffle condenser 122 are connected sequentially, meaning that the refrigerant vapor first enters the wire-tube condenser 121 for initial condensation, and then flows out and enters the baffle condenser 122 for further condensation. This sequential connection allows the refrigerant vapor to undergo sufficient heat exchange before completely condensing into a liquid, thus improving the cooling effect.

[0126] A second dryer filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23. The second dryer filter 25 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the second capillary tube 23, thereby reducing the risk of blockage of the second capillary tube 23.

[0127] A second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator. The second condenser 26 can be installed in different areas of the refrigeration equipment. For example, the second condenser 26 can be installed at the back of the refrigeration equipment. The second condenser 26 can condense the high-temperature and high-pressure superheated gas flowing out of the outlet of the second compressor 21 into a high-pressure subcooled liquid.

[0128] In some embodiments, a second drying filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23; a second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator.

[0129] A second dryer filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23. The second dryer filter 25 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the second capillary tube 23, thereby reducing the risk of blockage of the second capillary tube 23.

[0130] A second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator. The second condenser 26 can be installed in different areas of the refrigeration equipment. For example, the second condenser 26 can be installed at the back of the refrigeration equipment. The second condenser 26 can condense the high-temperature and high-pressure superheated gas flowing out of the outlet of the second compressor 21 into a high-pressure subcooled liquid.

[0131] In some embodiments, the first condenser group 12 includes a wire tube condenser 121 and a baffle condenser 122 connected in sequence, and a first drying filter 16 is provided between the baffle condenser 122 and the first capillary tube.

[0132] The wire tube condenser 121 and the baffle condenser 122 are located in different areas of the refrigeration equipment. The wire tube condenser 121 typically includes a series of small tubes designed to allow refrigerant vapor to flow through while an external cooling medium (such as water or air) flows through to remove the heat from the refrigerant vapor, thereby condensing it into a liquid.

[0133] The condenser 122 has a larger surface area for more efficient heat exchange. The condenser 122 is typically designed as one or more plates between which the refrigerant flows, while an external cooling medium flows over the outside of the plates to remove heat.

[0134] The wire-tube condenser 121 and the baffle condenser 122 are connected sequentially, meaning that the refrigerant vapor first enters the wire-tube condenser 121 for initial condensation, and then flows out and enters the baffle condenser 122 for further condensation. This sequential connection allows the refrigerant vapor to undergo sufficient heat exchange before completely condensing into a liquid, thus improving the cooling effect.

[0135] A first dryer filter 16 is provided between the enclosure condenser 122 and the first capillary tube. The first dryer filter 16 is used to reduce impurities, moisture or other contaminants that may exist in the refrigerant entering the first capillary tube, thereby reducing the risk of blockage of the first capillary tube.

[0136] In some embodiments, a second drying filter 25 is provided between the second path 142 of the evaporator and the second capillary tube 23.

[0137] The second dryer filter 25 is used to reduce impurities, moisture or other contaminants that may be present in the refrigerant entering the second capillary tube 23, thereby reducing the risk of blockage in the second capillary tube 23.

[0138] In some embodiments, a second condenser 26 is provided between the outlet of the second compressor 21 and the first path 221 of the regenerator. The second condenser 26 can be located in different areas of the refrigeration equipment, for example, the second condenser 26 can be located at the back of the refrigeration equipment. The second condenser 26 can condense the high-temperature and high-pressure superheated gas flowing out of the outlet of the second compressor 21 into a high-pressure subcooled liquid.

[0139] This application also provides a refrigeration device, including the refrigeration system provided in any of the above embodiments.

[0140] According to the refrigeration equipment provided in the embodiments of this application, since it includes the refrigeration system provided in any of the above embodiments, the refrigeration system provides at least one arc-shaped section 271 in the first pipe 27 connecting the inlet of the second path 222 of the regenerator and the outlet of the second evaporator 24. The design of the arc-shaped section 271 can reduce the flow resistance of the refrigerant, and at the same time shorten the straight section length of the first pipe 27, reducing the friction resistance. The accumulated liquid can flow back to the second evaporator 24 along the first pipe 27 according to the gravitational potential energy. As the accumulated refrigerant decreases, it is pushed out of the accumulation section by the refrigerant. The refrigerant mass flow rate in the second refrigeration cycle 2 increases, the cooling capacity of the second refrigeration cycle 2 increases, the inlet temperature of the second evaporator 24 decreases, and the outlet temperature of the second evaporator 24 increases. At the same time, the evaporator condenser 14 experiences a similar liquid shortage, the return gas temperature of the second path of the heat exchanger 13 increases, and the actual temperature inside the refrigeration equipment begins to decrease.

[0141] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0142] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0143] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0144] In the description of this application, "multiple" means two or more.

[0145] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0146] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0147] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0148] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration system, characterized in that, include: First refrigeration cycle and second refrigeration cycle; The first refrigeration cycle includes a first compressor, a first condenser group, a first path of heat exchangers, a first path of evaporative condensers, and a second path of heat exchangers connected in sequence. The second refrigeration cycle includes a second compressor, a first path of a regenerator, a second path of the evaporator-condenser, a second capillary tube, a second evaporator, and a second path of the regenerator, which are connected in sequence. In the vertical direction, the second inlet of the regenerator is higher than the outlet of the second evaporator, and the first pipe connecting the second inlet of the regenerator and the outlet of the second evaporator is provided with at least one arc-shaped section.

2. The refrigeration system according to claim 1, characterized in that, The first pipeline includes multiple segments connected in sequence and arranged along the height direction, with an arc-shaped segment between each adjacent segment.

3. The refrigeration system according to claim 2, characterized in that, The first pipeline includes a first section, a second section, and a third section connected in sequence. The first section and the third section extend laterally and are spaced apart vertically. The end of the first section away from the second end is connected to the outlet of the second evaporator, and the end of the third section away from the second section is connected to the second inlet of the regenerator. Arc-shaped sections are provided between the second section and the first section, and between the second section and the third section.

4. The refrigeration system according to claim 1, characterized in that, The evaporator-condenser includes a third serpentine tube section, which comprises a first serpentine section and a second serpentine section connected along the height direction. The two ends of the first serpentine section opposite to the second serpentine section are respectively connected to the second inlet of the heat exchanger and the first outlet of the regenerator. The two ends of the second serpentine section opposite to the first serpentine section are respectively connected to the first outlet of the heat exchanger and the inlet of the second capillary tube. Wherein, the first serpentine segment has a lateral width greater than the second serpentine segment, the first pipeline is located below the first serpentine segment in the vertical direction, the first segment and the second segment are located on one side of the second serpentine segment in the horizontal direction, and the third segment is located below the second serpentine segment in the vertical direction.

5. The refrigeration system according to claim 4, characterized in that, The evaporator and condenser are distributed laterally, and the end of the second serpentine section facing the heat exchanger is shorter laterally than the end of the first serpentine section facing the heat exchanger. The first section and the second section are located on the side of the second serpentine section facing the heat exchanger.

6. The refrigeration system according to claim 4, characterized in that, The regenerator includes a second serpentine tube section, the second serpentine tube section and the third serpentine tube section are distributed laterally, the vertical height of the third serpentine tube section is greater than the vertical height of the second serpentine tube section, and the first pipeline and the second serpentine tube section are distributed vertically.

7. The refrigeration system according to claim 6, characterized in that, The regenerator further includes a second connecting section, the two ports of which are opposite to the second serpentine tube section are respectively connected to the inlet and outlet of the second compressor, and the two ports of which are opposite to the second serpentine tube section are spaced apart from the first pipeline.

8. The refrigeration system according to any one of claims 1-7, characterized in that, The heat exchanger and the regenerator are stacked at a distance from each other along the thickness direction.

9. The refrigeration system according to claim 8, characterized in that, The heat exchanger is arranged outside the regenerator.

10. The refrigeration system according to any one of claims 1-7, characterized in that, The first refrigeration cycle also includes a liquid receiver, which is disposed between the first path of the evaporator-condenser and the second path of the heat exchanger.

11. The refrigeration system according to claim 10, characterized in that, Along the height direction of the reservoir, the outlet of the reservoir is higher than the inlet of the reservoir.

12. A refrigeration device, characterized in that, Includes the refrigeration system as described in any one of claims 1-11.

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