Refrigerating system, heat exchanger and refrigerating equipment

Abstract

The utility model discloses a refrigeration system, a heat exchanger and refrigeration equipment, and belongs to the field of refrigeration. The refrigerating system comprises a compressor, a condenser, a first heat exchange pipe of a heat exchanger, a first path of an air return pipe set, an evaporator, a second path of the air return pipe set and a second heat exchange pipe of the heat exchanger which are sequentially connected end to end. Wherein the tube wall of the first heat exchange tube is provided with a first contact surface, the tube wall of the second heat exchange tube is provided with a second contact surface, surface contact is formed between the first contact surface and the second contact surface, and the first heat exchange tube and the second heat exchange tube exchange heat through the first contact surface and the second contact surface. The heat exchange efficiency of the heat exchanger can be improved, the refrigeration effect is improved, and the exhaust pressure in a steady state is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refrigeration, and particularly relates to a refrigeration system, a heat exchanger and a refrigeration device. BACKGROUND

[0002] With the improvement of living standards, people's demand for refrigeration of refrigeration equipment is gradually increasing. However, the refrigeration equipment in the related art cannot meet the increasing demand for refrigeration, and needs to be improved. CONTENT OF THE INVENTION

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a refrigeration system, a heat exchanger and a refrigeration device, which can improve the heat exchange efficiency of the heat exchanger, improve the refrigeration effect, reduce the exhaust pressure of the refrigeration system in steady state, and reduce the noise.

[0004] In a first aspect, the present application provides a refrigeration system, comprising a compressor, a condenser, a first heat exchange pipe of a heat exchanger, a first path of a gas return pipe group, an evaporator, a second path of the gas return pipe group and a second heat exchange pipe of the heat exchanger connected in sequence.

[0005] The pipe wall of the first heat exchange pipe is provided with a first contact surface, the pipe wall of the second heat exchange pipe 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 pipe and the second heat exchange pipe exchange heat through the first contact surface and the second contact surface.

[0006] According to the refrigeration system of the present application, on the one hand, by setting the first heat exchange pipe and the second heat exchange pipe of the heat exchanger to be in surface contact, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the pressure reduction speed can be improved. On the other hand, by setting the heat exchanger and the gas return pipe group, the refrigerant discharged from the condenser is first exchanged in the heat exchanger, the temperature of the refrigerant is reduced, and then enters the evaporator through the throttling pressure reduction effect of the capillary of the gas return pipe group for further heat exchange, thereby improving the refrigeration effect, reducing the exhaust pressure of the refrigeration system in steady state, and reducing the noise of the whole machine.

[0007] According to an embodiment of the present application, the first contact surface and the second contact surface are both flat surfaces.

[0008] According to an embodiment of the present application, the pipe wall of the first heat exchange pipe and the pipe wall of the second heat exchange pipe each comprise two first arc-shaped sections and two first straight sections, the two first arc-shaped sections and the two first straight sections are arranged alternately and connected in sequence, one of the two first straight sections of the first heat exchange pipe is the first contact surface, and one of the two first straight sections of the second heat exchange pipe is the second contact surface.

[0009] According to one embodiment of the present application, the tube wall of the first heat exchange pipe and the tube wall of the second heat exchange pipe each comprises a second arc segment and a second flat segment for closing the second arc segment, the second flat segment of the first heat exchange pipe is the first contact surface, and one of the second flat segments of the second heat exchange pipe is the second contact surface.

[0010] According to one embodiment of the present application, the first heat exchange pipe and the second heat exchange pipe each comprise a plurality of third flat segments, the plurality of third flat segments are sequentially connected in a head-to-tail manner, one of the plurality of third flat segments of the first heat exchange pipe is the first contact surface, and one of the plurality of third flat segments of the second heat exchange pipe is the second contact surface.

[0011] According to one embodiment of the present application, the first contact surface and the second contact surface are arc surfaces.

[0012] According to one embodiment of the present application, the centers of curvature of the first contact surface and the second contact surface are located on the same side.

[0013] According to one embodiment of the present application, the first path of the gas return pipe group is a capillary tube; and / or,

[0014] A drying filter is arranged between the condenser and the first heat exchange pipe of the heat exchanger.

[0015] In a second aspect, the present application provides a heat exchanger applied to a refrigeration system, the heat exchanger comprising:

[0016] a first heat exchange pipe, one end of the first heat exchange pipe being used for being connected with an outlet of a condenser of the refrigeration system, and the other end of the first heat exchange pipe being used for being connected with an inlet of an evaporator of the refrigeration system;

[0017] a second heat exchange pipe, one end of the second heat exchange pipe being used for being connected with an inlet of a compressor of the refrigeration system, and the other end of the second heat exchange pipe being used for being connected with an outlet of the evaporator of the refrigeration system;

[0018] wherein a tube wall of the first heat exchange pipe is provided with a first contact surface, a tube wall of the second heat exchange pipe is provided with a second contact surface, a surface contact is formed between the first contact surface and the second contact surface, and the first heat exchange pipe and the second heat exchange pipe exchange heat through the first contact surface and the second contact surface.

[0019] According to the heat exchanger of the present application, by arranging the first heat exchange pipe and the second heat exchange pipe of the heat exchanger in a surface contact manner, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the pressure reduction speed can be improved.

[0020] In a third aspect, the present application provides a refrigeration device comprising the refrigeration system according to any one of the above.

[0021] According to the refrigeration equipment provided by the present application, by setting the refrigeration system of any one of the above, on the one hand, by setting the face contact between the first heat exchange pipe and the second heat exchange pipe of the heat exchanger, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the pressure reduction speed can be improved; on the other hand, by setting the heat exchanger and the gas return pipe group, the refrigerant discharged from the condenser is first exchanged in the heat exchanger, the temperature of the refrigerant is reduced, and then enters the evaporator through the throttling pressure reduction effect of the capillary of the gas return pipe group for further heat exchange, so that the refrigeration effect is improved, the exhaust pressure of the refrigeration system in the steady state is reduced, and the noise of the whole machine is reduced.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, given in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a structural schematic diagram of a refrigeration system provided by an embodiment of the present application;

[0025] Figure 2 is one of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0026] Figure 3 is another of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0027] Figure 4 is a third of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0028] Figure 5 is a fourth of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0029] Figure 6 is a fifth of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0030] Figure 7 is a sixth of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application;

[0031] Figure 8 is a seventh of the structural schematic diagrams of a heat exchanger provided by an embodiment of the present application.

[0032] Reference Signs:

[0033] 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 group 4, first path of return gas pipe group 41, second path of return gas pipe group 42, evaporator 5. Detailed Implementation

[0034] 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.

[0035] The following is for reference. Figures 1-8 The present application describes a refrigeration system, a heat exchanger 3, and a refrigeration device according to embodiments thereof. The refrigeration system is used to refrigerate the storage space of the refrigeration device.

[0036] 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.

[0037] 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.

[0038] 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, an evaporator 5, a second path 42 of a return gas pipe group, and a second heat exchange tube 32 of a heat exchanger 3 connected in sequence.

[0039] 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.

[0040] 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.

[0041] In some embodiments, the first path 41 of the gas return pipe group is a capillary tube for throttling and pressure reduction.

[0042] The working principle of the refrigeration system is as follows: the refrigerant is compressed into high-temperature and high-pressure mixed refrigerant gas by the compressor 1, the mixed refrigerant gas enters the condenser 2 to condense into gas-liquid two-phase binary mixed refrigerant, filters the moisture and impurities in the dry filter, the gas-liquid two-phase binary mixed refrigerant enters the first heat exchange pipe 31 of the heat exchanger 3, the first heat exchange pipe 31 of the heat exchanger 3 exchanges heat with the second heat exchange pipe 32 of the heat exchanger 3 to further condense; the binary mixed refrigerant enters the capillary tube to throttle and reduce pressure, and exchanges heat with the second path of the gas return pipe group 4 to further cool the binary mixed refrigerant; the refrigerant enters the evaporator 5 to exchange heat and form gas-liquid two-phase binary mixed refrigerant, the mixed refrigerant at the outlet of the evaporator 5 is in gas-liquid two-phase state, the gas-liquid two-phase binary mixed refrigerant exchanges heat with the second path of the gas return pipe group 4 and the capillary tube to cool the refrigerant in the capillary tube, and the outlet of the second path of the gas return pipe group 4 is still in gas-liquid two-phase state; the refrigerant exchanges heat with the first heat exchange pipe 31 of the heat exchanger 3 and the second heat exchange pipe 32 of the heat exchanger 3 to cool and condense the refrigerant in the first heat exchange pipe 31, and the outlet of the second heat exchange pipe 32 is in gaseous state; the gaseous refrigerant returns to the compressor 1 to complete one cycle.

[0043] The pressure reduction principle of the refrigeration system is as follows: the heat exchanger 3 is composed of the first heat exchange pipe 31 and the second heat exchange pipe 32, the high-temperature and high-pressure gas-liquid two-phase refrigerant enters the inlet of the first heat exchange pipe 31 after coming out of the condenser 2, flows through the first heat exchange pipe 31 to enter the capillary tube inlet; the refrigerant entering the second heat exchange pipe 32 is low-temperature and low-pressure gas-liquid two-phase refrigerant; due to the temperature difference between the first heat exchange pipe 31 and the second heat exchange pipe 32, heat exchange occurs, the temperature of the refrigerant in the first heat exchange pipe 31 decreases and the temperature of the refrigerant in the second heat exchange pipe 32 increases; the temperature of the refrigerant entering the first heat exchange pipe 31 is above the ambient temperature, and after heat exchange, the temperature of the refrigerant at the outlet of the first heat exchange pipe 31 is greatly reduced, which is between +32 and -10℃. The pressure and temperature of the refrigerant are positively correlated, the higher the temperature, the greater the pressure, so the pressure at the exhaust end of the refrigeration system of the present application is greatly reduced compared with the exhaust pressure of the conventional single-stage compression refrigeration system.

[0044] In the related art, the conventional single-stage compression refrigeration system does not have a heat exchanger, and usually only a gas return pipe group is provided. For an ultra-low temperature cabinet, the pressure of the section from the outlet of the compressor of the conventional single-stage compression refrigeration system to the inlet of the capillary tube is 2.2-2.4 MPa in a steady state. The pressure of the section from the outlet of the compressor of the refrigeration system of the present application to the inlet of the capillary tube is ≤1.6 MPa in a steady state, which is reduced by nearly 1 / 3.

[0045] The refrigeration system of the present application, by setting the heat exchanger 3 and the return gas pipe group 4, the refrigerant discharged from the condenser 2 first exchanges heat at the heat exchanger 3, the temperature of the refrigerant is reduced, and then enters the evaporator 5 through the throttling pressure reduction of the capillary tube of the return gas pipe group 4 for further heat exchange, improving the refrigeration effect, reducing the exhaust pressure of the refrigeration system in the steady state, and reducing the noise of the whole machine.

[0046] As shown in Figures 3-6 , the first contact surface 311 is arranged on the wall of the first heat exchange pipe 31, and the second contact surface 321 is arranged on the wall of the second heat exchange pipe 32, the first contact surface 311 and the second contact surface 321 form a surface contact, and the first heat exchange pipe 31 and the second heat exchange pipe 32 exchange heat through the first contact surface 311 and the second contact surface 321.

[0047] In this embodiment, the surface contact between the first heat exchange pipe 31 and the second heat exchange pipe 32 can increase the heat exchange area between the first heat exchange pipe 31 and the second heat exchange pipe 32, thereby improving the heat exchange efficiency between the first heat exchange pipe 31 and the second heat exchange pipe 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.

[0048] Among them, the extension directions of the first contact surface 311 and the second contact surface 321 are the same to form a surface contact.

[0049] According to the heat exchanger 3 provided by the present application, by arranging the first heat exchange pipe 31 of the heat exchanger 3 and the second heat exchange pipe 32 of the heat exchanger 3 in surface contact, the first heat exchange pipe 31 and the second heat exchange pipe 32 exchange heat through the first contact surface 311 and the second contact surface 321, which can increase the heat exchange area and improve the heat exchange efficiency and the pressure reduction speed.

[0050] Among them, the surface contact between the first heat exchange pipe 31 and the second heat exchange pipe 32 at least includes the following four kinds of structural design.

[0051] First, as shown in Figures 2-5 , the first contact surface 311 and the second contact surface 321 are both planes, and the first heat exchange pipe 31 and the second heat exchange pipe 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.

[0052] Among them, the structure of the first heat exchange pipe 31 and the second heat exchange pipe 32 can be the same or different, and in the case that the structure of the first heat exchange pipe 31 and the second heat exchange pipe 32 is the same, the structure of the first heat exchange pipe 31 and the second heat exchange pipe 32 at least can include the following forms:

[0053] First, as shown in Figure 2As 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The plate heat exchange tube has four third flat sections 326, each of which is a plane, and the third flat sections 326 of the first heat exchange tube 31 and the second heat exchange tube 32 form a surface contact. The four third flat sections 326 of the plate heat exchange tube can have the same area, and any third flat section 326 of the first heat exchange tube 31 and the second heat exchange tube 32 forms a surface contact; or, the area of the third flat section 326 on one side of the plate heat exchange tube is greater than that on the other side, and the third flat section 326 with a larger area of the first heat exchange tube 31 and the second heat exchange tube 32 forms a surface contact.

[0062] In the case of different structures of the first heat exchange tube 31 and the second heat exchange tube 32, at least one flat section is included in the structure of the first heat exchange tube 31 and the second heat exchange tube 32, and the flat sections of the first heat exchange tube 31 and the second heat exchange tube 32 form a surface contact.

[0063] Secondly, as shown in Figure 6 , the first contact surface 311 and the second contact surface 321 are both arc surfaces.

[0064] For example, the first heat exchange tube 31 can be a circular tube structure, and the second heat exchange tube 32 can be a circular tube structure with a concave arc surface, and the first heat exchange tube 31 and the concave arc surface of the second heat exchange tube 32 are fitted together, increasing the heat exchange area and reducing the installation difficulty.

[0065] The pipe 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 surface contact.

[0066] In some embodiments, the centers of curvature of the first contact surface 311 and the second contact surface 321 are located on the same side to form a matching arc surface contact structure.

[0067] Among them, the center of curvature 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, and the center of curvature of the second contact surface 321 and the center of the second heat exchange tube 32 are located on the opposite side of the second contact surface 321, and 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.

[0068] In some embodiments, as shown in Figure 6 , the centers of curvature of the first contact surface 311 and the second contact surface 321 are coincidently arranged to better realize the surface contact of the first contact surface 311 and the second contact surface 321, further increase the heat exchange area between the first heat exchange tube 31 and the second heat exchange tube 32, and improve the heat exchange effect.

[0069] For example, as shown in Figure 7 and Figure 8As shown, the first heat exchange pipe 31 can be a circular pipe, and the second heat exchange pipe 32 can be a special-shaped pipe matched with the first heat exchange pipe 31, and part of the special-shaped pipe forms an arc surface in contact with the side wall surface of the circular pipe.

[0070] Thirdly, the first contact surface 311 and the second contact surface 321 are both wavy.

[0071] The wavy shape of the first contact surface 311 and the wavy shape of the second contact surface 321 are matched, further increasing the heat exchange area between the first heat exchange pipe 31 and the second heat exchange pipe 32, and improving the heat exchange effect.

[0072] Fourthly, the first contact surface 311 and the second contact surface 321 are both polyline.

[0073] The first contact surface 311 and the second contact surface 321 both include multiple fourth straight segments which are sequentially connected and designed to be bent, and the multiple fourth straight segments of the first contact surface 311 and the multiple fourth straight segments of the second contact surface 321 form a clamping structure, and 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 pipe 31 and the second heat exchange pipe 32, and improving the heat exchange effect.

[0074] In a second aspect, the present application also provides a heat exchanger 3, which comprises: a first heat exchange pipe 31 and a second heat exchange pipe 32, one end of the first heat exchange pipe 31 is used to be connected with the outlet of a condenser 2 of a refrigeration system, and the other end of the first heat exchange pipe 31 is used to be connected with the inlet of an evaporator 5 of the refrigeration system; one end of the second heat exchange pipe 32 is used to be connected with the inlet of a compressor 1 of the refrigeration system, and the other end of the second heat exchange pipe 32 is used to be connected with the outlet of the evaporator 5 of the refrigeration system.

[0075] Among them, the pipe wall of the first heat exchange pipe 31 is provided with a first contact surface 311, the pipe wall of the second heat exchange pipe 32 is provided with a second contact surface 321, the first contact surface 311 and the second contact surface 321 form surface contact, and the first heat exchange pipe 31 and the second heat exchange pipe 32 exchange heat through the first contact surface 311 and the second contact surface 321.

[0076] According to the heat exchanger 3 provided by the present application, by arranging surface contact between the first heat exchange pipe 31 and the second heat exchange pipe 32, the heat exchange area between the first heat exchange pipe 31 and the second heat exchange pipe 32 can be increased, thereby improving the heat exchange efficiency between the first heat exchange pipe 31 and the second heat exchange pipe 32, improving the heat exchange effect of the heat exchanger 3, and improving the working efficiency of the compressor 1 and the refrigeration efficiency of the refrigeration system.

[0077] In a second aspect, the present application also provides a refrigeration equipment comprising the refrigeration system in any of the above embodiments.

[0078] According to the refrigeration equipment provided in the application, by arranging the refrigeration system in any of the embodiments, the exhaust pressure during stable operation of the refrigeration system can be reduced, and the noise of the whole machine can be reduced.

[0079] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0080] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0081] In the description of the present application, "first feature" and "second feature" can include one or more features.

[0082] In the description of the present application, "a plurality of" means two or more.

[0083] In the description of the present application, "above" or "below" the first feature of the second feature can include direct contact between the first and second features, or can include indirect contact between the first and second features through another feature therebetween.

[0084] In the description of the present application, "above", "above" and "above" of the first feature of the second feature include the first feature directly above and obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height.

[0085] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. Such terminology means that a particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearances of such terminology in various places in the specification does not necessarily refer to the same embodiment or example. Moreover, it is appreciated that the specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0086] Although embodiments of this application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and variations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A refrigeration system characterized by, The first heat exchange pipe of the heat exchanger comprises a compressor, a condenser, a first heat exchange pipe of the heat exchanger, a first path of a gas return pipe group, an evaporator, a second path of the gas return pipe group, and a second heat exchange pipe of the heat exchanger; The first heat exchange pipe is provided with a first contact surface, and the second heat exchange pipe 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 pipe and the second heat exchange pipe exchange heat through the first contact surface and the second contact surface.

2. The refrigeration system of claim 1, wherein, The first contact surface and the second contact surface are both flat surfaces.

3. The refrigeration system of claim 2, wherein, The pipe wall of the first heat exchange pipe and the pipe wall of the second heat exchange pipe each comprise two first arc-shaped sections and two first straight sections. The two first arc-shaped sections and the two first straight sections are arranged alternately and connected in sequence. One of the two first straight sections of the first heat exchange pipe is the first contact surface, and one of the two first straight sections of the second heat exchange pipe is the second contact surface.

4. The refrigeration system of claim 2, wherein, The pipe wall of the first heat exchange pipe and the pipe wall of the second heat exchange pipe each comprise a second arc-shaped section and a second straight section for closing the second arc-shaped section. The second straight section of the first heat exchange pipe is the first contact surface, and one of the second straight sections of the second heat exchange pipe is the second contact surface.

5. The refrigeration system of claim 2 wherein, The first heat exchange pipe and the second heat exchange pipe each comprise a plurality of third straight sections connected in sequence. One of the third straight sections of the first heat exchange pipe is the first contact surface, and one of the third straight sections of the second heat exchange pipe is the second contact surface.

6. The refrigeration system of claim 1, wherein, The first contact surface and the second contact surface are arc surfaces.

7. The refrigeration system of claim 6, wherein, The centers of curvature of the first contact surface and the second contact surface are located on the same side.

8. The refrigeration system of any of claims 1-7, wherein, The first path of the gas return pipe group is a capillary tube; and / or A dry filter is arranged between the condenser and the first heat exchange pipe of the heat exchanger.

9. A heat exchanger, characterized by The heat exchanger is applied to a refrigeration system. A first heat exchange pipe of the heat exchanger, one end of the first heat exchange pipe being used for being connected with an outlet of a condenser of the refrigeration system, the other end of the first heat exchange pipe being used for being connected with an inlet of an evaporator of the refrigeration system; A second heat exchange pipe of the heat exchanger, one end of the second heat exchange pipe being used for being connected with an inlet of a compressor of the refrigeration system, the other end of the second heat exchange pipe being used for being connected with an outlet of the evaporator of the refrigeration system; The first heat exchange pipe is provided with a first contact surface, and the second heat exchange pipe 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 pipe and the second heat exchange pipe exchange heat through the first contact surface and the second contact surface.

10. A refrigeration appliance characterized in that, The refrigeration system comprises the heat exchanger according to any one of claims 1-8.

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