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 compressor, a condenser, a heat exchanger, a return pipe group and an evaporator. The outlet of the compressor is connected with the inlet of the condenser. The heat exchanger comprises first heat exchange pipes and second heat exchange pipes. The outlet of the condenser is connected with the inlet of the first heat exchange pipes. The return pipe group comprises a first path and a second path. The outlet of the first heat exchange pipes is connected with the inlet of the first path. The outlet of the first path is connected with the inlet of the evaporator. The outlet of the evaporator is connected with the inlet of the second path. The outlet of the second path is connected with the inlet of the second heat exchange pipes. The outlet of the second heat exchange pipes is connected with the inlet of the compressor. The second path of the return pipe group and the second heat exchange pipes of the heat exchanger are formed by the same heat exchange pipe. The application can improve the heat exchange efficiency of the refrigeration system and improve the refrigeration effect.

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 that can improve the heat exchange efficiency of the heat exchanger, improve the refrigeration effect, reduce the discharge pressure of the refrigeration system in steady state, and reduce noise.

[0004] In a first aspect, this application provides a refrigeration system applied to refrigeration equipment, comprising:

[0005] compressor;

[0006] A condenser, wherein the outlet of the compressor is connected to the inlet of the condenser;

[0007] The heat exchanger includes a first heat exchange tube and a second heat exchange tube, and the outlet of the condenser is connected to the inlet of the first heat exchange tube;

[0008] The return gas pipe assembly includes a first line and a second line, with the outlet of the first heat exchange pipe connected to the inlet of the first line.

[0009] The evaporator has the outlet of the first path connected to the inlet of the evaporator, the outlet of the evaporator connected to the inlet of the second path, the outlet of the second path connected to the inlet of the second heat exchange tube, and the outlet of the second heat exchange tube connected to the inlet of the compressor.

[0010] The second path of the return gas pipe group and the second heat exchange tube of the heat exchanger are formed by the same heat exchange pipe.

[0011] According to the refrigeration system of this application, on the one hand, by setting up a heat exchanger and a return gas pipe group, the refrigerant discharged from the condenser first undergoes heat exchange at the heat exchanger, and the refrigerant temperature decreases. Then, through the throttling and pressure reduction effect of the capillary tube of the return gas pipe group, it enters the evaporator for further heat exchange, thereby improving the refrigeration effect, reducing the discharge pressure of the refrigeration system in steady state, and reducing the noise of the whole machine. On the other hand, by setting the second path of the return gas pipe group and the second heat exchange tube of the heat exchanger to be formed by the same heat exchange pipe, the process can be simplified, while reducing the risk of refrigerant leakage and improving the reliability and safety of the refrigeration system.

[0012] According to one embodiment of this application, the heat exchange pipeline includes a serpentine pipe segment extending along a first direction, the first heat exchange pipe extending along a portion of the serpentine pipe segment, and the first path extending along another portion of the serpentine pipe segment.

[0013] According to one embodiment of this application, the heat exchange pipeline includes a first serpentine pipe section and a second serpentine pipe section arranged and connected along a first direction. The outlet of the first serpentine pipe section is connected to the inlet of the compressor, and the inlet of the second serpentine pipe section is connected to the outlet of the evaporator. The length of the first serpentine pipe section along the second direction is longer than the length of the second serpentine pipe section along the second direction.

[0014] The second heat exchange tube of the heat exchanger includes the first serpentine tube section, and the second path of the return gas pipe group includes the second serpentine tube section;

[0015] The first heat exchange tube extends along the extension direction of the first serpentine tube segment and at least partially extends into the second serpentine tube segment, and the first path extends along the extension direction of the second serpentine tube segment.

[0016] According to one embodiment of this application, the refrigeration device includes an inner liner and an outer shell. Along the distribution direction of the inner liner and the outer shell, the evaporator, the second heat exchange tube, and the first heat exchange tube are arranged sequentially, and the temperatures of the evaporator, the second heat exchange tube, and the first heat exchange tube increase progressively.

[0017] According to one embodiment of this application, the wall of the first heat exchange tube is provided with a first contact surface, and the wall of the second heat exchange tube is provided with a second contact surface. The first contact surface and the second contact surface form a surface contact, and the first heat exchange tube and the second heat exchange tube exchange heat through the first contact surface and the second contact surface.

[0018] According to one embodiment of this application, both the first contact surface and the second contact surface are planar, and / or the first contact surface and the second contact surface are arc surfaces.

[0019] Secondly, this application also provides a refrigeration system as described in any of the above claims.

[0020] According to one embodiment of this application, the refrigeration device includes an inner liner, the heat exchanger is disposed on the side of the inner liner along the height direction, and the inlet of the first heat exchange tube is higher than the outlet of the first heat exchange tube along the height direction.

[0021] According to one embodiment of this application, the refrigeration equipment further includes a cabin and an outer shell, the inner liner and the cabin are both disposed within the outer shell, and the heat exchanger is disposed between the inner liner and the cabin and is attached to the outer wall of the cabin.

[0022] According to one embodiment of this application, an insulation layer is provided between the inner liner and the cabin, and the ratio Q of the thickness of the insulation layer to the height of the cabin satisfies: 0.4≤Q≤1.

[0023] 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

[0024] 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:

[0025] Figure 1 This is one of the structural schematic diagrams of the refrigeration system provided in the embodiments of this application;

[0026] Figure 2 This is a second schematic diagram of the refrigeration system provided in the embodiments of this application;

[0027] Figure 3 This is the third schematic diagram of the refrigeration system provided in the embodiments of this application;

[0028] Figure 4 This is the fourth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0029] Figure 5 This is the fifth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0030] Figure 6 This is the sixth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0031] Figure 7 This is the seventh schematic diagram of the refrigeration system provided in the embodiments of this application;

[0032] Figure 8 This is the eighth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0033] Figure 9 This is the ninth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0034] Figure 10 This is the tenth schematic diagram of the refrigeration system provided in the embodiments of this application;

[0035] Figure 11 This is eleventh of the structural schematic diagrams of the refrigeration system provided in the embodiments of this application;

[0036] Figure 12 This is one of the structural schematic diagrams of the refrigeration equipment provided in the embodiments of this application;

[0037] Figure 13 This is a second schematic diagram of the structure of the refrigeration equipment provided in the embodiments of this application;

[0038] Figure 14 This is the third structural schematic diagram of the refrigeration equipment provided in the embodiments of this application;

[0039] Figure 15 This is the fourth structural schematic diagram of the refrigeration equipment provided in the embodiments of this application.

[0040] Figure label:

[0041] Refrigeration equipment 100, inner liner 101, engine compartment 102, outer shell 103, insulation layer 104;

[0042] Compressor 1, condenser 2, heat exchanger 3, first heat exchange tube 31, first contact surface 311, second heat exchange tube 32, second contact surface 321, first arc segment 322, second arc segment 323, first straight segment 324, second straight segment 325, third straight segment 326, return gas pipe assembly 4, first path 41, second path 42, evaporator 5;

[0043] Heat exchange pipeline 6, first serpentine pipe section 61, second serpentine pipe section 62. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of the 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.

[0045] The following is for reference. Figures 1-15 This application describes a refrigeration system and a refrigeration device 100 according to embodiments of the present application. The refrigeration system is used to refrigerate the storage space of the refrigeration device 100.

[0046] It should be noted that the storage device in this embodiment can be understood as a refrigeration storage device in a broad sense, including but not limited to refrigerators, freezers, display cases, beverage cabinets, wine cabinets, refrigerated display cases, and refrigerated vending machines. The storage devices have diverse structural forms and a wide range of applications.

[0047] The storage device includes a box and a door. The box includes an outer shell 103, an inner liner 101, and an insulation layer 104 located between the outer shell 103 and the inner liner 101. The outer shell 103 covers the inner liner 101 and provides protection. The insulation layer 104 can be a foam layer, which provides insulation and cushioning. A machine compartment 102 is formed between the outer shell 103 and the inner liner 101. The machine compartment 102 is used to house machines such as the compressor 1 and the circuit breaker.

[0048] like Figure 1 As shown, the refrigeration system of this application embodiment includes a compressor 1, a condenser 2, a first heat exchange tube 31 of a heat exchanger 3, a first path 41 of a return gas pipe group 4, an evaporator 5, a second path 42 of the return gas pipe group 4, and a second heat exchange tube 32 of the heat exchanger 3, which are connected in sequence.

[0049] The compressor 1 outlet is connected to the condenser 2 inlet; the heat exchanger 3 includes a first heat exchange tube 31 and a second heat exchange tube 32, and the condenser 2 outlet is connected to the first heat exchange tube 31 inlet; the return gas pipe group 4 includes a first path 41 and a second path 42, the first heat exchange tube 31 outlet is connected to the first path 41 inlet; the first path 41 outlet is connected to the evaporator 5 inlet, the evaporator 5 outlet is connected to the second path 42 inlet, the second path 42 outlet is connected to the second heat exchange tube 32 inlet, and the second heat exchange tube 32 outlet is connected to the compressor 1 inlet.

[0050] The refrigerant in the refrigeration system can be a mixed refrigerant. The high-boiling-point refrigerant in the mixed refrigerant can be any one of R600a, R600, R290, R1270, R1243zf, R1234yf, R1234ze, or R1150, and the low-boiling-point refrigerant can be one of R170, R1150, R23, or R14.

[0051] Among them, the first heat exchange tube 31 exchanges heat with the second heat exchange tube 32. The first heat exchange tube 31 is a high-temperature tube and the second heat exchange tube 32 is a low-temperature tube. The first path 41 exchanges heat with the second path 42.

[0052] In some embodiments, a drying filter is provided between the condenser 2 and the first heat exchange tube 31 of the heat exchanger 3. The drying filter is used to filter out moisture and impurities in the refrigerant entering the first heat exchange tube 31 of the heat exchanger 3.

[0053] In some embodiments, the first path 41 of the return gas pipe group 4 is a capillary tube, which is used for throttling and pressure reduction.

[0054] The working principle of the refrigeration system: The refrigerant is compressed into a high-temperature, high-pressure mixed refrigerant gas by compressor 1. The mixed refrigerant gas enters condenser 2 and is condensed into a two-phase (gas-liquid) binary mixed refrigerant. It then enters a dryer filter to filter out moisture and impurities. The two-phase (gas-liquid) binary mixed refrigerant enters the first heat exchange tube 31 of heat exchanger 3, where it exchanges heat with the second heat exchange tube 32 for further condensation. The binary mixed refrigerant then enters a capillary tube for throttling and pressure reduction, and exchanges heat with the second path 42 in the return gas pipe group 4, further cooling the binary mixed refrigerant. After heat exchange in evaporator 5, a two-phase gas-liquid binary refrigerant mixture is formed. The mixed refrigerant at the outlet of evaporator 5 is in a two-phase gas-liquid state. This two-phase gas-liquid binary refrigerant undergoes heat exchange with the capillary tube through the second path 42 in the return gas pipe group 4, thereby cooling the refrigerant in the capillary tube. The outlet of the second path 42 in the return gas pipe group 4 is still in a two-phase gas-liquid state. The refrigerant enters the first heat exchange tube 31 of heat exchanger 3 and exchanges heat with the second heat exchange tube 32 of heat exchanger 3, causing the refrigerant in the first heat exchange tube 31 to cool down and condense. The outlet of the second heat exchange tube 32 is in a gaseous state. The gaseous refrigerant returns to compressor 1 to complete one cycle.

[0055] The pressure reduction principle of the refrigeration system: Heat exchanger 3 is composed of a first heat exchange tube 31 and a second heat exchange tube 32. High-temperature, high-pressure gas-liquid two-phase refrigerant enters the inlet of the first heat exchange tube 31 after exiting the condenser 2, flowing through the first heat exchange tube 31 and into the capillary inlet. The refrigerant entering the second heat exchange tube 32 is a low-temperature, low-pressure gas-liquid two-phase refrigerant. Due to the temperature difference between the first heat exchange tube 31 and the second heat exchange tube 32, heat exchange occurs, with the temperature of the refrigerant in the first heat exchange tube 31 decreasing and the temperature of the refrigerant in the second heat exchange tube 32 increasing. The temperature of the refrigerant entering the first heat exchange tube 31 is above ambient temperature, while after heat exchange, the temperature of the refrigerant at the outlet of the first heat exchange tube 31 decreases significantly, ranging from +32°C to -10°C. Refrigerant pressure and temperature are positively correlated; the higher the temperature, the greater the pressure. Therefore, the discharge pressure of the refrigeration system of this application is significantly lower than that of a conventional single-stage compression refrigeration system.

[0056] In related technologies, conventional single-stage compression refrigeration systems do not have a heat exchanger 3, and usually only have a return gas pipe assembly 4. For cryogenic cabinets, the steady-state pressure from the compressor 1 outlet to the capillary tube inlet of a conventional single-stage compression refrigeration system is 2.2 to 2.4 MPa. The steady-state pressure from the compressor 1 outlet to the capillary tube inlet of the refrigeration system of this application is ≤1.6 MPa, which is nearly one-third lower.

[0057] The refrigeration system of this application, by setting up a heat exchanger 3 and a return gas pipe group 4, allows the refrigerant discharged from the condenser 2 to first exchange heat at the heat exchanger 3, thereby reducing the temperature of the refrigerant. Then, through the throttling and pressure reduction effect of the capillary tube of the return gas pipe group 4, it enters the evaporator 5 for further heat exchange, thereby improving the refrigeration effect, reducing the discharge pressure of the refrigeration system in steady state, and reducing the noise of the whole machine.

[0058] In some embodiments, the ratio M of the internal volume of heat exchanger 3 to the internal volume of evaporator 5 satisfies: 20% ≤ M ≤ 45%, and the ratio N of the internal volume of condenser 2 to the internal volume of heat exchanger 3 satisfies: 20% ≤ N ≤ 54%.

[0059] The internal volume of heat exchanger 3 is the sum of the internal volumes of the first heat exchange tube 31 and the second heat exchange tube 32 of heat exchanger 3. The ratio M of the internal volume of heat exchanger 3 to the internal volume of evaporator 5 can be 20%, 25%, 30%, 35% or 45%, which can be determined based on the thermodynamic calculation and test of the refrigeration system.

[0060] In related technologies, in conventional single-stage compression refrigeration systems, the refrigerant exits the condenser 2 and directly enters the evaporator 5 for heat exchange through a capillary tube with throttling and pressure reduction. However, in the refrigeration system provided in this application, the refrigerant exits the condenser 2 and first undergoes heat exchange at the heat exchanger 3, losing some of its cooling capacity, before entering the evaporator 5 for heat exchange through the capillary tube with throttling and pressure reduction.

[0061] Based on the thermodynamic calculations and experimental tests of the refrigeration system, the relationship between heat exchanger 3 and evaporator 5 is matched. The ratio M of the internal volume of heat exchanger 3 to the internal volume of evaporator 5 is set in the range of 20% to 45%. This can increase the cooling capacity of the refrigeration system to meet the cooling requirements of the refrigeration equipment 100, while also reducing the exhaust pressure under steady state and reducing the noise of the whole machine.

[0062] The ratio N of the internal volume of condenser 2 to the internal volume of heat exchanger 3 can be 20%, 25%, 30%, 35%, 40% or 54%, and the specific ratio can be determined based on the thermodynamic calculation and test of the refrigeration system.

[0063] In this embodiment, the condenser 2 serves as a heat dissipation device for the refrigeration system. Simultaneously, the condenser 2 also plays a role in reducing pressure. The length of the condenser 2 piping and the heat dissipation area of ​​the condenser 2 determine the peak pressure of the compressor 1 during startup. The length of the condenser 2 piping and the heat dissipation area of ​​the condenser 2 can be measured by their internal volume. There is a certain quantitative relationship between the internal volume of the condenser 2 and the internal volume of the heat exchanger 3.

[0064] It should be noted that if the internal volume of condenser 2 is too small, it will result in poor heat dissipation, leading to excessive peak starting pressure and steady-state discharge pressure of compressor 1; if condenser 2 is too large, it will result in a waste of resources.

[0065] In this embodiment, the relationship between heat exchanger 3 and condenser 2 is matched, and the ratio N of the internal volume of condenser 2 to the internal volume of heat exchanger 3 is set to a range of 20% to 54%. This can meet the heat dissipation requirements of condenser 2, make reasonable use of resources, and at the same time reduce the peak starting pressure of compressor 1 and the discharge pressure during steady state.

[0066] In some embodiments, the ratio N of the internal volume of the condenser 2 to the internal volume of the heat exchanger 3 satisfies: 20% ≤ N ≤ 54%.

[0067] The ratio N of the internal volume of condenser 2 to the internal volume of heat exchanger 3 can be 20%, 25%, 30%, 35%, 40% or 54%, and the specific ratio can be determined based on the thermodynamic calculation and test of the refrigeration system.

[0068] In this embodiment, the condenser 2 serves as a heat dissipation device for the refrigeration system. Simultaneously, the condenser 2 also plays a role in reducing pressure. The length of the condenser 2 piping and the heat dissipation area of ​​the condenser 2 determine the peak pressure of the compressor 1 during startup. The length of the condenser 2 piping and the heat dissipation area of ​​the condenser 2 can be measured by their internal volume. There is a certain quantitative relationship between the internal volume of the condenser 2 and the internal volume of the heat exchanger 3.

[0069] It should be noted that if the internal volume of condenser 2 is too small, it will result in poor heat dissipation, leading to excessive peak starting pressure and steady-state discharge pressure of compressor 1; if condenser 2 is too large, it will result in a waste of resources.

[0070] In this embodiment, the relationship between heat exchanger 3 and condenser 2 is matched, and the ratio N of the internal volume of condenser 2 to the internal volume of heat exchanger 3 is set to a range of 20% to 54%. This can meet the heat dissipation requirements of condenser 2, make reasonable use of resources, and at the same time reduce the peak starting pressure of compressor 1 and the discharge pressure during steady state.

[0071] In some embodiments, the ratio M of the internal volume of the heat exchanger 3 to the internal volume of the evaporator 5 satisfies: 20% ≤ M ≤ 45%.

[0072] The internal volume of heat exchanger 3 is the sum of the internal volumes of the first heat exchange tube 31 and the second heat exchange tube 32 of heat exchanger 3. The ratio M of the internal volume of heat exchanger 3 to the internal volume of evaporator 5 can be 20%, 25%, 30%, 35% or 45%, which can be determined based on the thermodynamic calculation and test of the refrigeration system.

[0073] In related technologies, in conventional single-stage compression refrigeration systems, the refrigerant exits the condenser 2 and directly enters the evaporator 5 for heat exchange through a capillary tube with throttling and pressure reduction. However, in the refrigeration system provided in this application, the refrigerant exits the condenser 2 and first undergoes heat exchange at the heat exchanger 3, losing some of its cooling capacity, before entering the evaporator 5 for heat exchange through the capillary tube with throttling and pressure reduction.

[0074] Based on the thermodynamic calculations and experimental tests of the refrigeration system, the relationship between heat exchanger 3 and evaporator 5 is matched. The ratio M of the internal volume of heat exchanger 3 to the internal volume of evaporator 5 is set in the range of 20% to 45%. This can increase the cooling capacity of the refrigeration system to meet the cooling requirements of the refrigeration equipment 100, while also reducing the exhaust pressure under steady state and reducing the noise of the whole machine.

[0075] In some embodiments, the heat exchanger 3 is adapted to be installed on the side of the refrigeration equipment 100, and the inlet of the first heat exchange tube 31 is higher than the outlet of the first heat exchange tube 31 in the height direction.

[0076] The heat exchanger 3 can be installed on at least one of the back, left and right sides of the refrigeration equipment 100.

[0077] Since the first heat exchange tube 31 of the heat exchanger 3 is a high-temperature tube, the refrigerant is in a gas-liquid two-phase state in the first heat exchange tube 31 of the heat exchanger 3. The first heat exchange tube 31 of the heat exchanger 3 adopts an upper-in and lower-out method, with the refrigerant entering from the top and exiting from the bottom along the height direction. By taking into account the flow direction of the liquid refrigerant, the amount of gaseous refrigerant discharged from the first heat exchange tube 31 of the heat exchanger 3 can be reduced.

[0078] In some embodiments, the heat exchanger 3 is adapted to be installed on the bottom surface of the refrigeration equipment 100, which can disregard the flow direction of the liquid refrigerant, thereby improving the flexibility of the pipeline layout.

[0079] In some embodiments, the wall of the first heat exchange tube 31 is provided with a first contact surface 311, and the wall of the second heat exchange tube 32 is provided with a second contact surface 321. The first contact surface 311 and the second contact surface 321 form a surface contact, and the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat through the first contact surface 311 and the second contact surface 321.

[0080] Among them, such as Figures 3-6 As shown, the first heat exchange tube 31 has a first contact surface 311 on its tube wall, and the second heat exchange tube 32 has a second contact surface 321 on its tube wall. The first contact surface 311 and the second contact surface 321 form a surface contact, and the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat through the first contact surface 311 and the second contact surface 321.

[0081] In this embodiment, the first heat exchange tube 31 and the second heat exchange tube 32 are in surface contact, which can increase the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32, thereby improving the heat exchange efficiency between the first heat exchange tube 31 and the second heat exchange tube 32, improving the heat exchange effect of the heat exchanger 3, thereby improving the working efficiency of the compressor 1 and the refrigeration efficiency of the refrigeration system.

[0082] The first contact surface 311 and the second contact surface 321 extend in the same direction to form a surface contact.

[0083] According to the heat exchanger 3 provided in this application, by setting the first heat exchange tube 31 and the second heat exchange tube 32 of the heat exchanger 3 to surface contact, the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat through the first contact surface 311 and the second contact surface 321, which can increase the heat exchange area, improve the heat exchange efficiency, and increase the pressure reduction speed.

[0084] The surface contact between the first heat exchange tube 31 and the second heat exchange tube 32 includes at least the following four structural designs.

[0085] Firstly, such as Figures 2-5 As shown, both the first contact surface 311 and the second contact surface 321 are planar. The first heat exchange tube 31 and the second heat exchange tube 32 exchange heat through the surface contact formed by the first contact surface 311 and the second contact surface 321, which can reduce the installation difficulty and increase the heat exchange area.

[0086] The first heat exchange tube 31 and the second heat exchange tube 32 can have the same or different structures. If the first heat exchange tube 31 and the second heat exchange tube 32 have the same structure, the structure of the first heat exchange tube 31 and the second heat exchange tube 32 can include at least the following forms:

[0087] First, such as Figure 2 As shown, both the first heat exchange tube 31 and the second heat exchange tube 32 can be flat tubes, and the side wall of the first heat exchange tube 31 and the side wall of the second heat exchange tube 32 form a surface contact.

[0088] The walls of the first heat exchange tube 31 and the second heat exchange tube 32 each include two first arc-shaped segments 322 and two first straight segments 324. The two first arc-shaped segments 322 and the two first straight segments 324 are alternately arranged and connected end to end in sequence. One of the two first straight segments 324 of the first heat exchange tube 31 is a first contact surface 311, and one of the two first straight segments 324 of the second heat exchange tube 32 is a second contact surface 321.

[0089] The flat tube has a first arc-shaped surface at both ends and a first straight surface between the first arc-shaped surfaces. The first straight surface is located on both sides of the first heat exchange tube 31 and the second heat exchange tube 32, and the first straight surface of the first heat exchange tube 31 and the second heat exchange tube 32 contacts each other for heat exchange.

[0090] Second, such as Figure 3 As shown, both the first heat exchange tube 31 and the second heat exchange tube 32 can be irregularly shaped tubes.

[0091] The tube wall of the first heat exchange tube 31 and the tube wall of the second heat exchange tube 32 both include a second arc-shaped section 323 and a second straight section 325 for sealing the second arc-shaped section 323. The second straight section 325 of the first heat exchange tube 31 is the first contact surface 311, and one of the second straight sections 325 of the second heat exchange tube 32 is the second contact surface 321.

[0092] For example, such as Figure 4 As shown, the walls of the first heat exchange tube 31 and the second heat exchange tube 32 both include a second arc-shaped section 323 and a second straight section 325. The second straight section 325 of the first heat exchange tube 31 and the second straight section 325 of the second heat exchange tube 32 form a surface contact, which can both increase the volume of the first heat exchange tube 31 and the second heat exchange tube 32 and increase the heat exchange area by forming a surface contact.

[0093] Third, both the first heat exchange tube 31 and the second heat exchange tube 32 include multiple third straight sections 326, which are connected end to end in sequence. One of the multiple third straight sections 326 of the first heat exchange tube 31 is a first contact surface 311, and one of the multiple third straight sections 326 of the second heat exchange tube 32 is a second contact surface 321.

[0094] For example, such as Figure 5 As shown, the first heat exchange tube 31 and the second heat exchange tube 32 can both be plate heat exchange tubes, and the side walls of the first heat exchange tube 31 and the second heat exchange tube 32 form a surface contact.

[0095] The plate heat exchanger tube has four third straight sections 326, all of which are planar. The third straight sections 326 of the first heat exchanger tube 31 and the second heat exchanger tube 32 form surface contact. The areas of the four third straight sections 326 of the plate heat exchanger tube can be the same, and any third straight section 326 of the first heat exchanger tube 31 and the second heat exchanger tube 32 can be connected to form surface contact; or, the area of ​​the third straight section 326 on one opposite side of the plate heat exchanger tube is larger than the area of ​​the third straight section 326 on the other opposite side, and the third straight section 326 with the larger area of ​​the first heat exchanger tube 31 and the second heat exchanger tube 32 can be connected to form surface contact.

[0096] When the structures of the first heat exchange tube 31 and the second heat exchange tube 32 are different, each of the first heat exchange tube 31 and the second heat exchange tube 32 includes at least one straight section, and the straight section of the first heat exchange tube 31 and the straight section of the second heat exchange tube 32 are connected to form a surface contact.

[0097] Secondly, such as Figure 6 As shown, both the first contact surface 311 and the second contact surface 321 are curved surfaces.

[0098] For example, such as Figure 7 As shown, the first heat exchange tube 31 can be a circular tube structure, such as... Figure 8 As shown, the second heat exchange tube 32 can be a circular tube structure with a partially concave arc surface. The first heat exchange tube 31 and the second heat exchange tube 32 are fitted together with the partially concave arc surface to increase the heat exchange area and reduce the installation difficulty.

[0099] The diameters of the first heat exchange tube 31 and the second heat exchange tube 32 can be the same or different, and both can achieve the effect of arc-shaped surface contact.

[0100] In some embodiments, the curvature centers of the first contact surface 311 and the second contact surface 321 are located on the same side to form a fitting arc-shaped surface-to-surface contact structure.

[0101] The curvature center of the first contact surface 311 and the center of the first heat exchange tube 31 are located on the same side of the first contact surface 311, while the curvature center of the second contact surface 321 and the center of the second heat exchange tube 32 are located on opposite sides of the second contact surface 321. The first contact surface 311 and the second contact surface 321 are fitted together, increasing the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32 and improving the heat exchange effect.

[0102] In some embodiments, such as Figure 6 As shown, the curvature centers of the first contact surface 311 and the second contact surface 321 are aligned to better achieve surface contact between the first contact surface 311 and the second contact surface 321, thereby further increasing the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32 and improving the heat exchange effect.

[0103] For example, such as Figure 7 and Figure 8 As shown, the first heat exchange tube 31 can be a round tube, and the second heat exchange tube 32 can be a shaped tube adapted to the first heat exchange tube 31, with a portion of the shaped tube forming an arc surface that contacts the side wall of the round tube.

[0104] Third, both the first contact surface 311 and the second contact surface 321 are wavy.

[0105] The wavy shape of the first contact surface 311 matches the wavy shape of the second contact surface 321, further increasing the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32, and improving the heat exchange effect.

[0106] Fourth, both the first contact surface 311 and the second contact surface 321 are polygonal.

[0107] Both the first contact surface 311 and the second contact surface 321 include multiple sequentially connected and bent fourth straight segments. The multiple fourth straight segments of the first contact surface 311 and the multiple fourth straight segments of the second contact surface 321 form an interlocking structure. The fourth straight segments of the first contact surface 311 and the corresponding fourth straight segments of the second contact surface 321 form surface contact, thereby further increasing the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32 and improving the heat exchange effect.

[0108] Secondly, this application also provides a heat exchanger 3, which includes: a first heat exchange tube 31 and a second heat exchange tube 32. One end of the first heat exchange tube 31 is connected to the outlet of the condenser 2 of the refrigeration system, and the other end of the first heat exchange tube 31 is connected to the inlet of the evaporator 5 of the refrigeration system. One end of the second heat exchange tube 32 is connected to the inlet of the compressor 1 of the refrigeration system, and the other end of the second heat exchange tube 32 is connected to the outlet of the evaporator 5 of the refrigeration system.

[0109] The first heat exchange tube 31 has a first contact surface 311 on its tube wall, and the second heat exchange tube 32 has a second contact surface 321 on its tube wall. The first contact surface 311 and the second contact surface 321 form a surface contact, and the first heat exchange tube 31 and the second heat exchange tube 32 exchange heat through the first contact surface 311 and the second contact surface 321.

[0110] According to the heat exchanger 3 provided in this application, by setting the surface contact between the first heat exchange tube 31 and the second heat exchange tube 32, the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32 can be increased, thereby improving the heat exchange efficiency between the first heat exchange tube 31 and the second heat exchange tube 32, improving the heat exchange effect of the heat exchanger 3, thereby improving the working efficiency of the compressor 1 and improving the refrigeration efficiency of the refrigeration system.

[0111] In some embodiments, such as Figure 9 As shown, the refrigeration system of this application embodiment includes a compressor 1, a condenser 2, a first heat exchange tube 31 of a heat exchanger 3, a first path 41 of a return gas pipe group 4, an evaporator 5, a second path 42 of a return gas pipe group 4, a second heat exchange tube 32 of a heat exchanger 3, and the second path 42 of the return gas pipe group 4 and the second heat exchange tube 32 of the heat exchanger 3 are formed by the same heat exchange pipe 6.

[0112] Among them, the second path 42 of the return gas pipe group 4 and the second heat exchange tube 32 of the heat exchanger 3 share a heat exchange pipe 6. The heat exchange pipe 6 can be bent and extended to form the second path 42 of the return gas pipe group 4 and the second heat exchange tube 32 of the heat exchanger 3.

[0113] The compressor 1 outlet is connected to the condenser 2 inlet; the heat exchanger 3 includes a first heat exchange tube 31 and a second heat exchange tube 32, and the condenser 2 outlet is connected to the first heat exchange tube 31 inlet; the return gas pipe group 4 includes a first path 41 and a second path 42, the first heat exchange tube 31 outlet is connected to the first path 41 inlet; the first path 41 outlet is connected to the evaporator 5 inlet, the evaporator 5 outlet is connected to the second path 42 inlet, the second path 42 outlet is connected to the second heat exchange tube 32 inlet, and the second heat exchange tube 32 outlet is connected to the compressor 1 inlet.

[0114] It should be noted that heat exchanger 3 and return gas pipe assembly 4 are two refrigeration components at the refrigeration system level. Heat exchanger 3 consists of a first heat exchange tube 31 (high-temperature tube) and a second heat exchange tube 32 (low-temperature tube), while the return gas pipe assembly consists of a first path 41 (capillary tube) and a second path 42 (return gas pipe). In related technologies, if the structure connecting heat exchanger 3 and return gas pipe assembly 4 is used, the connecting pipes between heat exchanger 3 and return gas pipe assembly 4 are generally welded. This results in complex processes and a risk of refrigerant leakage, leading to poor refrigeration and substandard refrigeration temperature. Furthermore, since heat exchanger 3 and return gas pipe assembly 4 are installed separately within the foaming layer, they are prone to tilting, which can cause condensation in the refrigeration equipment 100.

[0115] The first heat exchange tube 31 of the heat exchanger 3 and the first line 41 of the return gas pipe group 4 can be welded together to form an integral unit, thereby integrating the heat exchanger 3 and the return gas pipe group 4. This allows the heat exchanger 3 and the return gas pipe group 4 to be installed together outside the inner liner 101, reducing the tilting of the heat exchanger 3 and the return gas pipe group 4, improving the stability of their positions, and reducing condensation caused by tilting.

[0116] According to the refrigeration system provided in this application, by setting the second path 42 of the return gas pipe group 4 and the second heat exchange tube 32 of the heat exchanger 3 to be formed by the same heat exchange pipe 6, the process can be simplified, the risk of refrigerant leakage can be reduced, and the reliability and safety of the refrigeration system can be improved.

[0117] In some embodiments, such as Figure 9 As shown, the heat exchange pipeline 6 includes a serpentine pipe section extending along a first direction, the first heat exchange pipe 31 extending along a portion of the serpentine pipe section, and the first path 41 extending along another portion of the serpentine pipe section.

[0118] Among them, the first heat exchange tube 31 and the first path 41 extend in the same direction as the corresponding part of the heat exchange tube 6.

[0119] The first direction can be the height direction of the refrigeration equipment 100, or the width or length direction of the refrigeration equipment 100. When the heat exchange pipe 6 is located on the side of the refrigeration equipment 100, the first direction is the height direction of the refrigeration equipment 100; when the heat exchange pipe 6 is located on the bottom surface of the refrigeration equipment 100, the first direction can be the length direction of the refrigeration equipment 100.

[0120] In this embodiment, the first heat exchange tube 31, the first path 41, and the heat exchange pipeline 6 are configured in a serpentine bend and extension shape, which can increase the heat exchange length and heat exchange area between the first heat exchange tube 31 and the heat exchange pipeline 6, as well as between the first path 41 and the heat exchange pipeline 6, thereby improving the heat exchange efficiency.

[0121] In some embodiments, such as Figure 9 As shown, the heat exchange pipeline 6 includes a first serpentine pipe section 61 and a second serpentine pipe section 62 arranged and connected along a first direction. The outlet of the first serpentine pipe section 61 is connected to the inlet of the compressor 1, and the inlet of the second serpentine pipe section 62 is connected to the outlet of the evaporator 5. The first heat exchange pipe 31 extends along the extension direction of the first serpentine pipe section 61 and at least partially extends to the second serpentine pipe section 62. The first path 41 extends along the extension direction of the second serpentine pipe section 62.

[0122] The second heat exchange tube 32 of heat exchanger 3 includes a first serpentine tube section 61, and the second path 42 of return gas tube group 4 includes a second serpentine tube section 62.

[0123] In this embodiment, as Figure 10 As shown, setting the second heat exchange tube 32 formed by the first heat exchange tube 31 and the heat exchange pipe 6 into a serpentine extension shape can increase the heat exchange length and heat exchange area of ​​the first heat exchange tube 31 and the heat exchange pipe 6, thereby improving the heat exchange efficiency; setting the second path 42 formed by the first path 41 and the heat exchange pipe 6 into a serpentine extension shape can increase the heat exchange length and heat exchange area of ​​the first path 41 and the heat exchange pipe 6, thereby improving the heat exchange efficiency and thus improving the refrigeration efficiency of the refrigeration system.

[0124] The first serpentine tube segment 61 is longer in the second direction than the second serpentine tube segment 62 in the second direction. The second serpentine tube segment 62 is set to be shorter in the second direction, so that it can avoid the position of the cabin 102.

[0125] Wherein, the first direction is perpendicular to the second direction. When the heat exchange pipe 6 is set on the side of the refrigeration equipment 100, the first direction is the height direction of the refrigeration equipment 100 and the second direction is the left and right direction of the refrigeration equipment 100. When the heat exchange pipe 6 is set on the bottom surface of the refrigeration equipment 100, the first direction can be the length direction of the refrigeration equipment 100 and the second direction is the front and back direction of the refrigeration equipment 100.

[0126] In some embodiments, such as Figure 9 As shown, the first heat exchange tube 31 of the heat exchanger 3 and the first path 41 of the return gas pipe group 4 are distributed along the third direction with the heat exchange pipe 6 to reduce the difficulty of processing and assembly.

[0127] Among them, the third direction, the first direction, and the second direction are perpendicular to each other.

[0128] When the heat exchange pipe 6 is located on the side of the refrigeration equipment 100, the first direction is the height direction of the refrigeration equipment 100, the second direction is the left-right direction of the refrigeration equipment 100, and the third direction is the front-back direction of the refrigeration equipment 100; when the heat exchange pipe 6 is located on the bottom surface of the refrigeration equipment 100, the first direction can be the length direction of the refrigeration equipment 100, the second direction is the front-back direction of the refrigeration equipment 100, and the third direction is the height direction of the refrigeration equipment 100.

[0129] In some embodiments, such as Figure 11 As shown, the refrigeration equipment 100 includes an inner liner 101 and an outer shell 103. Along the distribution direction of the inner liner 101 and the outer shell 103, the evaporator 5, the second heat exchange tube 32 and the first heat exchange tube 31 are arranged in sequence, and the temperatures of the evaporator 5, the second heat exchange tube 32 and the first heat exchange tube 31 increase sequentially.

[0130] Among them, the evaporator 5 is wrapped around the outer wall of the inner liner 101, and the temperature of the evaporator 5 is the lowest; the second heat exchange tube 32 is located near the temperature of the evaporator 5, and the temperature of the second heat exchange tube 32 is higher than the temperature of the evaporator 5; the first heat exchange tube 31 is located near the outer shell 103, and the temperature of the first heat exchange tube 31 is higher than the temperature of the second heat exchange tube 32; the temperature outside the outer shell 103 is the ambient temperature.

[0131] For example, the average temperature of the evaporator 5 can be -70°C, the average temperature of the second heat exchange tube 32 of the heat exchanger 3 can be -50°C, the average temperature of the first heat exchange tube 31 of the heat exchanger 3 can be 18°C, and the ambient temperature can be 32°C.

[0132] Therefore, the location of heat exchanger 3 is related to whether the refrigeration system meets the cooling capacity of the freezer.

[0133] In this embodiment, by arranging the evaporator 5, the second heat exchange tube 32, and the first heat exchange tube 31 sequentially along the distribution direction of the inner liner 101 and the outer shell 103 to form a temperature gradient, the heat exchange between the evaporator 5 and the first heat exchange tube 31, and between the second heat exchange tube 32 and the ambient temperature, can be reduced, heat dissipation can be reduced, and the cooling effect can be improved.

[0134] In some embodiments, such as Figure 11As shown, the distance L1 between the evaporator 5 and the second heat exchange tube 32 satisfies: L1 > 15 mm; the distance L2 between the first heat exchange tube 31 and the outer wall of the outer shell 103 satisfies: L2 > 45 mm.

[0135] The distance L1 between the evaporator 5 and the second heat exchange tube 32 can be 16mm, 20mm, 25mm, 30mm or greater, to reduce the heat exchange between the evaporator 5 and the second heat exchange tube 32; the distance L2 between the first heat exchange tube 31 and the outer wall of the outer shell 103 can be 46mm, 50mm, 65mm or greater, to reduce the heat exchange between the first heat exchange tube 31 and the ambient temperature.

[0136] In this embodiment, by setting the distance between the evaporator 5 and the second heat exchange tube 32 and the distance between the first heat exchange tube 31 and the outer wall of the outer casing 103, the heat exchange between the evaporator 5 and the first heat exchange tube 31 and between the second heat exchange tube 32 and the ambient temperature can be reduced, thereby reducing heat dissipation and improving the cooling effect.

[0137] In some embodiments, the distance L2 between the first heat exchange tube 31 and the outer wall of the housing 103 satisfies: L2 > 45 mm.

[0138] The distance L2 between the first heat exchange tube 31 and the outer wall of the outer shell 103 can be 46mm, 50mm, 65mm or larger, in order to reduce the heat exchange between the first heat exchange tube 31 and the ambient temperature.

[0139] In some embodiments, the distance L1 between the evaporator 5 and the second heat exchange tube 32 satisfies: L1 > 15 mm.

[0140] The distance L1 between the evaporator 5 and the second heat exchange tube 32 can be 16mm, 20mm, 25mm, 30mm or larger, in order to reduce the heat exchange between the evaporator 5 and the second heat exchange tube 32.

[0141] Secondly, this application also provides a refrigeration device 100, including the refrigeration system in any of the above embodiments.

[0142] According to the refrigeration device 100 provided in this application, by setting the refrigeration system in any of the above embodiments, the exhaust pressure of the refrigeration system during stable operation can be reduced, and the noise of the whole machine can be reduced.

[0143] In some embodiments, such as Figure 12 and Figure 13 As shown, the refrigeration equipment 100 includes an inner tank 101, a heat exchanger 3 is disposed on the side of the inner tank 101 along the height direction, and the inlet of the first heat exchange tube 31 is higher than the outlet of the first heat exchange tube 31 along the height direction.

[0144] The heat exchanger 3 can be installed between the side of the refrigeration equipment 100 and the side of the inner liner 101. For example, the heat exchanger 3 can be installed on at least one of the back, left and right sides of the inner liner 101.

[0145] Since the first heat exchange tube 31 of the heat exchanger 3 is a high-temperature tube, the refrigerant is in a gas-liquid two-phase state in the first heat exchange tube 31 of the heat exchanger 3. The first heat exchange tube 31 of the heat exchanger 3 adopts an upper-in and lower-out method, with the refrigerant entering from the top and exiting from the bottom along the height direction. By taking into account the flow direction of the liquid refrigerant, the amount of gaseous refrigerant discharged from the first heat exchange tube 31 of the heat exchanger 3 can be reduced.

[0146] In some embodiments, such as Figure 14 As shown, the heat exchanger 3 is suitable for installation on the bottom surface of the refrigeration equipment 100, which eliminates the need to consider the flow direction of the liquid refrigerant, thereby improving the flexibility of the pipeline layout.

[0147] In some embodiments, such as Figure 15 As shown, the refrigeration equipment 100 also includes a cabin 102 and an outer shell 103. The inner liner 101 and the cabin 102 are both located inside the outer shell 103. The heat exchanger 3 is located between the inner liner 101 and the cabin 102 and is attached to the outer wall of the cabin 102.

[0148] In this embodiment, the heat exchanger 3 can be installed between the inner liner 101 and the engine compartment 102. The heat exchanger 3 can be pre-embedded between the inner liner 101 and the engine compartment 102, and then filled with insulation material. The insulation material can be foam material. The insulation material can have a heat preservation effect on the heat exchanger 3, reduce the heat exchange between the heat exchanger 3 and the outside, and improve the heat exchange effect of the first heat exchange tube 31 and the second heat exchange tube 32 of the heat exchanger 3.

[0149] In some embodiments, an insulation layer 104 is provided between the inner liner 101 and the cabin 102, and the ratio Q of the thickness of the insulation layer 104 to the height of the cabin 102 satisfies: 0.4≤Q≤1.

[0150] The ratio Q of the thickness of the insulation layer 104 to the height of the cabin 102 can be 0.4, 0.6, 0.7, 0.9 or 1. By increasing the thickness of the insulation layer 104, the phenomenon of condensation at the location where the heat exchanger 3 of the refrigeration equipment 100 is installed can be reduced.

[0151] 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.

[0152] 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.

[0153] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0154] In the description of this application, "multiple" means two or more.

[0155] 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 it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0156] 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.

[0157] 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.

[0158] 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, The refrigeration system is applied to refrigeration equipment and includes: compressor; A condenser, wherein the outlet of the compressor is connected to the inlet of the condenser; The heat exchanger includes a first heat exchange tube and a second heat exchange tube, and the outlet of the condenser is connected to the inlet of the first heat exchange tube; The return gas pipe assembly includes a first line and a second line, with the outlet of the first heat exchange pipe connected to the inlet of the first line. The evaporator has the outlet of the first path connected to the inlet of the evaporator, the outlet of the evaporator connected to the inlet of the second path, the outlet of the second path connected to the inlet of the second heat exchange tube, and the outlet of the second heat exchange tube connected to the inlet of the compressor. The second path of the return gas pipe group and the second heat exchange tube of the heat exchanger are formed by the same heat exchange pipe.

2. The refrigeration system according to claim 1, characterized in that, The heat exchange pipeline includes a serpentine pipe section extending along a first direction, the first heat exchange pipe extending along a portion of the serpentine pipe section, and the first path extending along another portion of the serpentine pipe section.

3. The refrigeration system according to claim 2, characterized in that, The heat exchange pipeline includes a first serpentine tube section and a second serpentine tube section arranged and connected along a first direction. The inlet of the second serpentine tube section is connected to the outlet of the evaporator. The length of the first serpentine tube section along the second direction is longer than the length of the second serpentine tube section along the second direction. The second heat exchange tube of the heat exchanger includes the first serpentine tube section, and the second path of the return gas pipe group includes the second serpentine tube section; The first heat exchange tube extends along the extension direction of the first serpentine tube segment and at least partially extends into the second serpentine tube segment, and the first path extends along the extension direction of the second serpentine tube segment.

4. The refrigeration system according to claim 1, characterized in that, The refrigeration equipment includes an inner liner and an outer shell. Along the distribution direction of the inner liner and the outer shell, the evaporator, the second heat exchange tube and the first heat exchange tube are arranged in sequence, and the temperature of the evaporator, the second heat exchange tube and the first heat exchange tube increases progressively.

5. The refrigeration system according to any one of claims 1-4, characterized in that, The first heat exchange tube has a first contact surface on its tube wall, and the second heat exchange tube has a second contact surface on its tube wall. The first contact surface and the second contact surface form a surface contact, and the first heat exchange tube and the second heat exchange tube exchange heat through the first contact surface and the second contact surface.

6. The refrigeration system according to claim 5, characterized in that, Both the first contact surface and the second contact surface are planar, and / or both the first contact surface and the second contact surface are curved.

7. A refrigeration device, characterized in that, Includes the refrigeration system as described in any one of claims 1-6.

8. The refrigeration equipment according to claim 7, characterized in that, The refrigeration equipment includes an inner tank, and the heat exchanger is disposed on the side of the inner tank along the height direction, with the inlet of the first heat exchange tube being higher than the outlet of the first heat exchange tube along the height direction.

9. The refrigeration equipment according to claim 7, characterized in that, The refrigeration equipment also includes a cabin and an outer shell. The inner liner and the cabin are both located inside the outer shell. The heat exchanger is located between the inner liner and the cabin and is attached to the outer wall of the cabin.

10. The refrigeration equipment according to claim 9, characterized in that, An insulation layer is provided between the inner liner and the cabin, and the ratio Q of the thickness of the insulation layer to the height of the cabin satisfies: 0.4≤Q≤1.

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