Heat exchanger system, refrigeration system and air conditioner having the same

Abstract

This invention discloses a heat exchanger system, a refrigeration system, and an air conditioner having the same. The heat exchanger system has a first main inlet and a second main inlet and an outlet. The heat exchanger system includes: multiple heat exchangers, including a first heat exchanger and a second heat exchanger. The first heat exchanger includes a first body section and a first subcooling section. The second heat exchanger includes a second body section and a second subcooling section. When the air conditioner is in refrigeration mode, refrigerant flows from the first main inlet and an outlet to the second main inlet and an outlet. Both the first body section and the second body section are connected to the first main inlet and an outlet. Refrigerant flowing out of the first body section and the second body section flows to the first subcooling section and the second subcooling section, respectively. Refrigerant flowing out of the first body section also flows to the second subcooling section and / or refrigerant flowing out of the second body section also flows to the first subcooling section. According to the heat exchanger system of this invention, at least a portion of the refrigerant can be subcooled twice, improving the subcooling degree, cooling capacity, cooling effect, and energy efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to a heat exchanger system, a refrigeration system and an air conditioner having the same. Background Technology

[0002] In related technologies, when an air conditioner is in cooling mode, the indoor heat exchanger is used entirely for evaporation, and the outdoor heat exchanger is used entirely for condensation. The heat exchange capacity of the heat exchanger cannot be effectively utilized, resulting in poor cooling performance of the air conditioner. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a heat exchanger system that can achieve secondary subcooling of at least a portion of the refrigerant, thereby improving the subcooling degree and cooling capacity of the heat exchanger system, enhancing the cooling effect of the heat exchanger system, and improving the energy efficiency of the heat exchanger system.

[0004] The present invention also proposes a refrigeration system, which includes the heat exchanger system described above.

[0005] The present invention also proposes an air conditioner, which includes the above-described refrigeration system.

[0006] A heat exchanger system according to an embodiment of the present invention is used in an air conditioner. The heat exchanger system has a first main inlet and a second main inlet and a third. The heat exchanger system includes: a heat exchanger, wherein there are multiple heat exchangers including a first heat exchanger and a second heat exchanger. The first heat exchanger includes a first body section and a first subcooling section. The second heat exchanger includes a second body section and a second subcooling section. When the air conditioner is in cooling mode, refrigerant flows from the first main inlet and a third to the second main inlet and a third. One end of the first body section and one end of the second body section are both connected to the first main inlet and a third. Refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section, respectively. Refrigerant flowing out from the first body section also flows to the second subcooling section and / or refrigerant flowing out from the second body section also flows to the first subcooling section.

[0007] According to the heat exchanger system of the present invention, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section respectively, and the refrigerant flowing out from the first body section also flows to the second subcooling section and / or the refrigerant flowing out from the second body section also flows to the first subcooling section. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and cooling capacity of the heat exchanger system, improving the cooling effect of the heat exchanger system, and enhancing the energy efficiency of the heat exchanger system.

[0008] In addition, the heat exchanger system according to the present invention may also have the following additional technical features:

[0009] In some embodiments, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section flows to the first subcooling section and the second subcooling section, and the refrigerant flowing out from the second body section flows only to the second subcooling section. The first subcooling section has a first end and a second end, and the second subcooling section has a third end and a fourth end. The first end is connected to the first body section, the third end is connected to the second body section and the second end, and the fourth end is connected to the second total inlet and outlet.

[0010] In some embodiments, the heat exchanger system further includes a first control valve connected in series between the second end and the third end.

[0011] In some embodiments, the second main inlet and outlet are connected to the second end, and the heat exchanger system further includes a second control valve connected in series between the second main inlet and outlet and the second end.

[0012] In some embodiments, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section. The first subcooling section has a first end and a second end, and the second subcooling section has a third end and a fourth end. The first end is connected to the first body section and the second body section, the second end is connected to the third end, and the fourth end is connected to the second total inlet and outlet.

[0013] In some embodiments, the second total inlet and outlet are connected to both the first body section and the second body section, and the heat exchanger system further includes a third control valve connected in series between the second total inlet and outlet and the first body section, and between the second total inlet and outlet and the second body section.

[0014] In some embodiments, the first subcooling section has a first end and a second end, the second subcooling section has a third end and a fourth end, the first body section and the second body section are both connected to the first end, the third end is connected to the second body section and the second end, and the fourth end is connected to the second total inlet and outlet.

[0015] In some embodiments, the heat exchanger system further includes: a fourth control valve connected in series between the second body section and the third end; and a fifth control valve connected in series between the second body section and the first end.

[0016] In some embodiments, the second total inlet / outlet is connected to the second end and the first body section, and the heat exchanger system further includes: a sixth control valve connected in series between the second total inlet / outlet and the second end and between the second total inlet / outlet and the first body section; and a seventh control valve connected in series between the second end and the third end.

[0017] In some embodiments, the flow path between the second main inlet / outlet and the first body section and the flow path between the second body section and the first end have a common section, and the fifth control valve is disposed on the common section.

[0018] In some embodiments, the heat exchanger system further includes an eighth control valve connected in series between the sixth control valve and the common section.

[0019] In some embodiments, the heat exchanger system further includes: a distributor, wherein there are multiple distributors including a first distributor and a second distributor, the first distributor and the second distributor corresponding to the first heat exchanger and the second heat exchanger respectively, the first distributor being used to connect the first body section and the first subcooling section, and the second distributor being used to connect the second body section and the second subcooling section or the first subcooling section.

[0020] The present invention also provides a refrigeration system having the above embodiments.

[0021] According to the refrigeration system of the present invention, by providing the above-mentioned heat exchanger system, when the air conditioner is in the cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section respectively, and the refrigerant flowing out from the first body section also flows to the second subcooling section and / or the refrigerant flowing out from the second body section also flows to the first subcooling section. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and cooling capacity of the heat exchanger system, improving the cooling effect of the heat exchanger system, and enhancing the energy efficiency of the heat exchanger system.

[0022] The present invention also provides an air conditioner having the above-described embodiments.

[0023] According to an embodiment of the present invention, an air conditioner equipped with the above-described refrigeration system, when the air conditioner is in refrigeration mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section respectively, and the refrigerant flowing out from the first body section also flows to the second subcooling section and / or the refrigerant flowing out from the second body section also flows to the first subcooling section. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and cooling capacity of the heat exchanger system, improving the cooling effect of the heat exchanger system, and enhancing the energy efficiency of the heat exchanger system.

[0024] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of a heat exchanger system according to the first embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the flow direction of the heat exchanger system in cooling mode according to the first embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a heat exchanger system according to a second embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the flow direction of the heat exchanger system in cooling mode according to the second embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a heat exchanger system according to a third embodiment of the present invention.

[0031] Figure label:

[0032] 100. Heat exchanger system; 101. Second main inlet and outlet;

[0033] 1. First heat exchanger; 11. First subcooling section; 111. First end; 112. Second end;

[0034] 2. Second heat exchanger; 21. Second subcooling section; 211. Third end; 212. Fourth end;

[0035] 31. First control valve; 32. Second control valve;

[0036] 41. Third control valve;

[0037] 51. Fourth control valve; 52. Fifth control valve; 521. Common section; 53. Sixth control valve; 54. Seventh control valve; 55. Eighth control valve;

[0038] 6. Dispenser; 61. First dispenser; 62. Second dispenser. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this invention, 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] A heat exchanger system 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0044] like Figure 1 , Figure 3 and Figure 5As shown, a heat exchanger system 100 according to an embodiment of the present invention is used in an air conditioner. The heat exchanger system 100 has a first main inlet and a second main inlet and a third inlet 101. The first main inlet and a third inlet are connected to a compressor, and the second main inlet and a third inlet 101 are connected to a throttle valve (or expansion valve). The heat exchanger system 100 includes a heat exchanger.

[0045] It is understood that the heat exchanger of the present invention is an outdoor heat exchanger. When the air conditioner is in cooling mode, the compressor draws in the low-temperature, low-pressure refrigerant vapor from the evaporator. After adiabatic compression, it becomes high-temperature, high-pressure superheated vapor, which is then pressed into the condenser for constant-pressure cooling. In the condenser, the high-temperature, high-pressure superheated vapor releases heat to the cooling medium (such as water or air) and is cooled into subcooled liquid refrigerant. Subsequently, the liquid refrigerant passes through the expansion valve for adiabatic throttling and becomes low-pressure liquid refrigerant, which then re-enters the evaporator to absorb heat and vaporize, completing the refrigeration cycle.

[0046] Specifically, see the attached document. Figure 1 Appendix Figure 3 and attached Figure 5 As shown, there are multiple heat exchangers, including a first heat exchanger 1 and a second heat exchanger 2. The first heat exchanger 1 includes a first body section and a first subcooling section 11. The second heat exchanger 2 includes a second body section and a second subcooling section 21. The first subcooling section 11 is located below the first body section, and the second subcooling section 21 is located below the second body section. It can be used to further cool the condensed refrigerant, so that its temperature is lower than the saturation temperature, thereby reducing flash loss and wet compression problems during evaporation in the evaporator, and optimizing the refrigeration efficiency and economy of the air conditioner's refrigeration system.

[0047] Further, see attached document. Figure 2 and attached Figure 4 As shown, when the air conditioner is in cooling mode, the refrigerant flows from the first main inlet and outlet to the second main inlet and outlet 101. One end of the first body section and one end of the second body section are both connected to the first main inlet and outlet. The refrigerant flowing out of the first body section and the second body section flows to the first subcooling section 11 and the second subcooling section 21, respectively. The refrigerant flowing out of the first body section also flows to the second subcooling section 21 and / or the refrigerant flowing out of the second body section also flows to the first subcooling section 11.

[0048] It is understandable that the refrigerant flowing out of the first body section may flow to both the first subcooling section 11 and the second subcooling section 21, while the refrigerant flowing out of the second body section may only flow to the second subcooling section 21; or the refrigerant flowing out of the first body section may only flow to the first subcooling section 11, while the refrigerant flowing out of the second body section may flow to both the first subcooling section 11 and the second subcooling section 21; or the refrigerant flowing out of both the first body section and the second body section may flow to both the first subcooling section 11 and the second subcooling section 21 simultaneously.

[0049] Understandably, when the air conditioner is in cooling mode, the refrigerant flowing out of the compressor is divided into two parts by the first main inlet and outlet. One part of the refrigerant flows to the first body section, and the other part flows to the second body section. The refrigerant flowing out of at least one of the first body section and the second body section flows through the first subcooling section 11 and the second subcooling section 21 in sequence, which can achieve secondary subcooling of at least part of the refrigerant. This relatively increases the length of the subcooling section through which the refrigerant flows, improves the subcooling degree and cooling capacity of the heat exchanger system 100, improves the cooling effect of the heat exchanger system 100, enhances the energy efficiency of the heat exchanger system 100, and can also reduce the dryness of the refrigerant entering the indoor heat exchanger, improve the heat exchange effect of the indoor heat exchanger, and reduce the refrigerant noise of the indoor heat exchanger.

[0050] According to the embodiment of the present invention, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section 11 and the second subcooling section 21, respectively. The refrigerant flowing out from the first body section also flows to the second subcooling section 21 and / or the refrigerant flowing out from the second body section also flows to the first subcooling section 11. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and cooling capacity of the heat exchanger system 100, improving the cooling effect of the heat exchanger system 100, and enhancing the energy efficiency of the heat exchanger system 100.

[0051] In some embodiments of the present invention, reference is made to the appendix. Figure 1 and attached Figure 2 As shown, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section flows to the first subcooling section 11 and the second subcooling section 21, and the refrigerant flowing out from the second body section flows only to the second subcooling section 21. The first subcooling section 11 has a first end 111 and a second end 112, and the second subcooling section 21 has a third end 211 and a fourth end 212. The first end 111 is connected to the first body section, the third end 211 is connected to the second body section and the second end 112, and the fourth end 212 is connected to the second total inlet / outlet 101.

[0052] It is understandable that when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section flows directly to the first end 111, and after passing through the first subcooling section 11, it flows out from the second end 112. After merging with the refrigerant flowing out from the second body section, it flows together to the third end 211, and then through the second subcooling section 21, it flows directly from the fourth end 212 to the second total inlet / outlet 101. The refrigerant flowing out from the first body section flows through the first subcooling section 11 and the second subcooling section 21 in sequence, which can achieve secondary subcooling of part of the refrigerant. This can reduce the gravity pressure drop in the upward flow of the second body section, reduce the large pressure drop at low flow rates, reduce power consumption, improve the subcooling degree and cooling capacity of the heat exchanger system 100, improve the cooling effect of the heat exchanger system 100, and improve the energy efficiency of the heat exchanger system 100.

[0053] In a further embodiment of the invention, reference is made to the appendix. Figure 1 As shown, the heat exchanger system 100 also includes a first control valve 31, which is connected in series between the second end 112 and the third end 211 to control the flow path between the second end 112 and the third end 211. Specifically, the first control valve 31 is a one-way valve, which limits the refrigerant to flow only from the second end 112 to the third end 211, and not from the third end 211 to the second end 112. This ensures the unidirectional flow of the refrigerant, allowing the refrigerant flowing from the first subcooling section 11 to the second subcooling section 21, and preventing the refrigerant in the second body section or the second subcooling section 21 from flowing back to the first subcooling section 11. This protects the equipment and components in the heat exchanger system 100 and ensures the service life of the heat exchanger system 100.

[0054] In a further embodiment of the invention, reference is made to the appendix. Figure 1 As shown, the second main inlet / outlet 101 is connected to the second end 112. The heat exchanger system 100 also includes a second control valve 32, which is connected in series between the second main inlet / outlet 101 and the second end 112 to control the flow path between the second main inlet / outlet 101 and the second end 112. Specifically, the second control valve 32 is a one-way valve, which limits the refrigerant to flow only from the second main inlet / outlet 101 to the second end 112, and not from the second end 112 to the second main inlet / outlet 101. This ensures the unidirectional flow of the refrigerant, so that in heating mode, the refrigerant at the second main inlet / outlet 101 flows to the first subcooling section 11, preventing the refrigerant in the first subcooling section 11 from flowing back to the second main inlet / outlet 101, thereby protecting the equipment and components in the heat exchanger system 100 and ensuring the service life of the heat exchanger system 100.

[0055] It is understandable that when the air conditioner is in heating mode, the refrigerant flowing out from the second main inlet / outlet 101 is divided into two parts. One part of the refrigerant flows through the second control valve 32 to the second end 112 of the first subcooling section 11, and after passing through the first subcooling section 11, it flows from the first end 111 to the first body section. The other part of the refrigerant flows directly to the fourth end 212 of the second subcooling section 21, and after passing through the second subcooling section 21, it flows from the third end 211 to the second body section.

[0056] In some embodiments of the present invention, reference is made to the appendix. Figure 3 and attached Figure 4As shown, when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section 11 and the second subcooling section 21. The first subcooling section 11 has a first end 111 and a second end 112, and the second subcooling section 21 has a third end 211 and a fourth end 212. The first end 111 is connected to the first body section and the second body section, the second end 112 is connected to the third end 211, and the fourth end 212 is connected to the second total inlet / outlet 101.

[0057] It is understandable that when the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section merges and flows together to the first end 111. After passing through the first subcooling section 11, it flows out from the second end 112, then directly to the third end 211, and after passing through the second subcooling section 21, it flows directly from the fourth end 212 to the second total inlet / outlet 101. The refrigerant flowing out from the first body section and the second body section can pass through the first subcooling section 11 and the second subcooling section 21 in sequence, which can achieve secondary subcooling of all refrigerants, greatly improving the subcooling degree and cooling capacity of the heat exchanger system 100, improving the cooling effect of the heat exchanger system 100, and improving the energy efficiency of the heat exchanger system 100.

[0058] In a further embodiment of the invention, reference is made to the appendix. Figure 3 As shown, the second main inlet / outlet 101 is connected to both the first body section and the second body section. The heat exchanger system 100 also includes a third control valve 41, which is connected in series between the second main inlet / outlet 101 and the first body section, and between the second main inlet / outlet 101 and the second body section, for controlling the flow path between the second main inlet / outlet 101 and the first body section, and between the second main inlet / outlet 101 and the second body section.

[0059] Understandably, when the air conditioner is in heating mode, the refrigerant flowing out from the second main inlet / outlet 101 is divided into two parts. Due to the resistance difference, most of the refrigerant flows directly to the first body section and the second body section through the third control valve 41, and the remaining part of the refrigerant flows to the fourth end 212 of the second subcooling section 21. After passing through the second subcooling section 21, it flows from the third end 211 to the second end 112. After passing through the first subcooling section 11, it flows from the first end 111 to the first body section.

[0060] Specifically, the third control valve 41 is a one-way valve, used to limit the refrigerant flow only from the second total inlet / outlet 101 to the first body section and the second body section, and not from the first body section and the second body section to the second total inlet / outlet 101. This ensures the one-way flow of the refrigerant, so that in heating mode, the refrigerant at the second total inlet / outlet 101 flows to the first body section and the second body section, preventing the refrigerant in the first body section and the second body section from flowing back to the second total inlet / outlet 101. It can utilize the pressure drop difference in the flow path of the heat exchanger system 100 to reduce the refrigerant flow through the first subcooling section 11 and the second subcooling section 21, thereby reducing the possibility of frost formation on the outside of the heat exchanger, solving the problem of incomplete defrosting, and increasing the outlet superheat of the first subcooling section 11 and the second subcooling section 21 in the heating mode of the air conditioner. This protects the equipment and components in the heat exchanger system 100 and ensures the service life of the heat exchanger system 100.

[0061] In some embodiments of the present invention, reference is made to the appendix. Figure 5 As shown, the first subcooling section 11 has a first end 111 and a second end 112, and the second subcooling section 21 has a third end 211 and a fourth end 212. The first body section and the second body section are both connected to the first end 111, the third end 211 is connected to the second body section and the second end 112, and the fourth end 212 is connected to the second total inlet and outlet 101.

[0062] It is understandable that the air conditioner's cooling modes include a first cooling mode and a second cooling mode. When the compressor's operating frequency is less than 30Hz, the air conditioner is in the first cooling mode. The refrigerant flowing out from the first body section flows directly to the first end 111. After passing through the first subcooling section 11, it flows out from the second end 112. After merging with the refrigerant flowing out from the second body section, it flows together to the third end 211. Then, after passing through the second subcooling section 21, it flows directly from the fourth end 212 to the second total inlet / outlet 101. The refrigerant flowing out from the first body section flows through the first subcooling section 11 and the second subcooling section 21 in sequence, which can achieve secondary subcooling of part of the refrigerant under low load. This can reduce the gravity pressure drop in the upward flow of the second body section, reduce the large pressure drop under low flow, reduce power consumption, improve the subcooling degree and cooling capacity of the heat exchanger system 100, improve the cooling effect of the heat exchanger system 100, and improve the energy efficiency of the heat exchanger system 100.

[0063] When the compressor operates at a frequency greater than or equal to 30Hz, the air conditioner is in the second cooling mode. The refrigerant flowing out from the first body section and the second body section merges and flows together to the first end 111. After passing through the first subcooling section 11, it flows out from the second end 112, then directly to the third end 211, and after passing through the second subcooling section 21, it flows directly from the fourth end 212 to the second total inlet / outlet 101. The refrigerant flowing out from the first body section and the second body section can pass through the first subcooling section 11 and the second subcooling section 21 in sequence, which can achieve secondary subcooling of all refrigerant under high load, greatly improving the subcooling degree and cooling capacity of the heat exchanger system 100, improving the cooling effect of the heat exchanger system 100, and improving the energy efficiency of the heat exchanger system 100.

[0064] In a further embodiment of the invention, reference is made to the appendix. Figure 5 As shown, the heat exchanger system 100 also includes a fourth control valve 51 and a fifth control valve 52. The fourth control valve 51 is connected in series between the second body section and the third end 211 to control the flow path between the second body section and the third end 211. The fifth control valve 52 is connected in series between the second body section and the first end 111 to control the flow path between the second body section and the first end 111. By providing the fifth control valve 52, the flow path of the heat exchanger system 100 can be made variable, enabling switching between the first refrigeration mode and the second refrigeration mode, improving adjustability under high load and partial load conditions, and meeting the needs of both the first and second refrigeration modes.

[0065] In a further embodiment of the invention, reference is made to the appendix. Figure 5 As shown, the second main inlet / outlet 101 is connected to the second end 112 and the first body section. The heat exchanger system 100 also includes a sixth control valve 53 and a seventh control valve 54. The sixth control valve 53 is connected in series between the second main inlet / outlet 101 and the second end 112, and between the second main inlet / outlet 101 and the first body section, and is used to control the flow path between the second main inlet / outlet 101 and the second end 112, and between the second main inlet / outlet 101 and the first body section. The seventh control valve 54 is connected in series between the second end 112 and the third end 211, and is used to control the flow path between the second end 112 and the third end 211. By providing the sixth control valve 53 and the seventh control valve 54, the flow path of the heat exchanger system 100 can be made variable, realizing the switching between the cooling mode and the heating mode, and meeting the different needs of the cooling mode and the heating mode.

[0066] It is understandable that the air conditioner's heating modes include a first heating mode, a second heating mode, and a third heating mode. When the compressor's operating frequency is less than 50Hz and the external ambient temperature is below 6℃, the air conditioner is in the first heating mode. The refrigerant flowing out from the second total inlet / outlet 101 is divided into two parts. One part of the refrigerant flows through the sixth control valve 53 to the second end 112 of the first subcooling section 11. After passing through the first subcooling section 11, it flows from the first end 111 to the first body section. The other part of the refrigerant flows directly to the fourth end 212 of the second subcooling section 21. After passing through the second subcooling section 21, it flows from the third end 211 to the second body section. This enables the heat exchanger system 100 to operate with low pressure drop and high heating capacity.

[0067] When the compressor operates at a frequency greater than or equal to 50Hz and the ambient temperature outside is higher than 20℃, the air conditioner is in the second heating mode. The refrigerant flowing out from the second main inlet / outlet 101 is divided into two parts. Due to the resistance difference, most of the refrigerant flows directly to the first body section and the second body section through the sixth control valve 53. The remaining part of the refrigerant flows to the fourth end 212 of the second subcooling section 21. After passing through the second subcooling section 21, it flows from the third end 211 to the second end 112. After passing through the first subcooling section 11, it flows from the first end 111 to the first body section. This can reduce the heat absorption effect of the heat exchanger on the outside environment, reduce the pressure of the heat exchanger system 100, reduce the exhaust temperature under high temperature heating conditions, and achieve high temperature protection operation during heating.

[0068] When the compressor operates at a frequency greater than or equal to 60Hz and the ambient temperature is below 2℃, the air conditioner is in the third heating mode. The refrigerant flowing out from the second total inlet / outlet 101 is divided into two parts. Due to the resistance difference, most of the refrigerant flows directly to the first and second body sections through the sixth control valve 53. The remaining refrigerant flows to the fourth end 212 of the second subcooling section 21. After passing through the second subcooling section 21, it flows from the third end 211 to the second end 112. After passing through the first subcooling section 11, it flows from the first end 111 to the first body section. By utilizing the pressure drop difference between the subcooling section and the body section, and taking advantage of the smaller pressure drop in the body section and the larger pressure drop in the subcooling section, the refrigerant flow through the first and second subcooling sections 11 and 21 is reduced. This reduces the possibility of frost formation on the outside of the heat exchanger, solves the problem of incomplete defrosting, and increases the outlet superheat of the first and second subcooling sections 11 and 21 in the third heating mode. This ensures high flow rates in the first and second body sections, achieving high heating operation.

[0069] In a further embodiment of the invention, reference is made to the appendix. Figure 5As shown, the flow path between the second main inlet / outlet 101 and the first body section and the flow path between the second body section and the first end 111 have a common section 521. The fifth control valve 52 is provided on the common section 521. The fifth control valve 52 can be used to control the flow path between the second main inlet / outlet 101 and the first body section and the flow path between the second body section and the first end 111, and can meet the switching between the first cooling mode, the second cooling mode, the first heating mode, the second heating mode and the third heating mode.

[0070] In a further embodiment of the invention, reference is made to the appendix. Figure 5 As shown, the heat exchanger system 100 also includes an eighth control valve 55, which is connected in series between the sixth control valve 53 and the common section 521. It is used to control the flow path between the sixth control valve 53 and the common section 521, and can prevent the refrigerant in the common section 521 from flowing directly to the second total inlet and outlet 101 through the eighth control valve 55.

[0071] In a specific example, see Appendix Figure 5 As shown, the first body section and the second body section are both connected to the first end 111, the third end 211 is connected to the second body section and the second end 112, the fourth end 212 is connected to the second total inlet and outlet 101, the second total inlet and outlet 101 is connected to the second end 112 and the first body section, the heat exchanger system 100 has a fourth control valve 51, a fifth control valve 52, a sixth control valve 53, a seventh control valve 54 and an eighth control valve 55, the heat exchanger system 100 has a first cooling mode, a second cooling mode, a first heating mode, a second heating mode and a third heating mode, and can switch between the first cooling mode, the second cooling mode, the first heating mode, the second heating mode and the third heating mode by factors such as the operating mode, the compressor operating frequency and the external ambient temperature, to meet different user needs.

[0072] When the compressor operating frequency is less than 30Hz, the air conditioner is in the first cooling mode, with the fourth control valve 51 and the seventh control valve 54 open, and the fifth control valve 52, the sixth control valve 53, and the eighth control valve 55 closed. When the compressor operating frequency is greater than or equal to 30Hz, the air conditioner is in the second cooling mode, with the fifth control valve 52 and the seventh control valve 54 open, and the fourth control valve 51, the sixth control valve 53, and the eighth control valve 55 closed. When the compressor operating frequency is less than 50Hz and the ambient temperature is below 6℃, the air conditioner is in the first heating mode, with the fourth control valve 51 and the sixth control valve 54 open. 3. When the compressor operates at a frequency greater than or equal to 50Hz and the ambient temperature outside is higher than 20℃, the air conditioner is in the second heating mode, and the fourth control valve 51, the fifth control valve 52, the sixth control valve 53, and the eighth control valve 55 are open, while the seventh control valve 54 is closed. When the compressor operates at a frequency greater than or equal to 60Hz and the ambient temperature outside is lower than 2℃, the air conditioner is in the third heating mode, and the fourth control valve 51, the fifth control valve 52, the sixth control valve 53, and the eighth control valve 55 are open, while the seventh control valve 54 is closed.

[0073] In some embodiments of the present invention, reference is made to the appendix. Figure 1 Appendix Figure 3 and attached Figure 5 As shown, the heat exchanger system 100 also includes multiple distributors 6, including a first distributor 61 and a second distributor 62. The first distributor 61 and the second distributor 62 correspond to the first heat exchanger 1 and the second heat exchanger 2, respectively. The first distributor 61 is used to connect the first body section and the first subcooling section 11, and the second distributor 62 is used to connect the second body section and the second subcooling section 21 or the first subcooling section 11. When the air conditioner is in cooling mode, the first distributor 61 is used to collect multiple streams of refrigerant from the first body section and deliver the refrigerant to the first subcooling section 11. The second distributor 62 is used to collect multiple streams of refrigerant from the first body section and deliver the refrigerant to the first subcooling section 11. The refrigerant flows through the second subcooling section 21 or the first subcooling section 11. When the air conditioner is in heating mode, the first distributor 61 is used to divide the refrigerant from the first subcooling section 11 and the second total inlet / outlet 101 into multiple streams and deliver them to the first body section. The second distributor 62 is used to divide the refrigerant from the second subcooling section 21 and the second total inlet / outlet 101 into multiple streams and deliver them to the second body section. The arrangement of the first distributor 61 and the second distributor 62 can make the refrigerant flow smoother, reduce flow resistance and pressure drop, thereby improving the heat exchange efficiency of the heat exchanger system 100.

[0074] It should be noted that the heat exchanger of the present invention is a finned heat exchanger, which includes fins and multiple heat exchange tubes. The multiple heat exchange tubes are inserted through the fins and are evenly spaced. The multiple heat exchange tubes are connected to the distributor 6 through multiple diversion capillary tubes, and each diversion capillary tube is connected to one or more heat exchange tubes.

[0075] The present invention also proposes a refrigeration system having the heat exchanger system 100 of the above embodiments.

[0076] According to the refrigeration system of the present invention, by providing the heat exchanger system 100 described above, when the air conditioner is in refrigeration mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section 11 and the second subcooling section 21 respectively, and the refrigerant flowing out from the first body section also flows to the second subcooling section 21 and / or the refrigerant flowing out from the second body section also flows to the first subcooling section 11. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and refrigeration capacity of the heat exchanger system 100, improving the refrigeration effect of the heat exchanger system 100, and enhancing the energy efficiency of the heat exchanger system 100.

[0077] The present invention also proposes an air conditioner having the refrigeration system described in the above embodiments.

[0078] According to an embodiment of the present invention, an air conditioner equipped with the above-described refrigeration system, when the air conditioner is in refrigeration mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section 11 and the second subcooling section 21, respectively. The refrigerant flowing out from the first body section also flows to the second subcooling section 21 and / or the refrigerant flowing out from the second body section also flows to the first subcooling section 11. This enables at least a portion of the refrigerant to be subcooled twice, relatively increasing the length of the subcooling section through which the refrigerant flows, improving the subcooling degree and refrigeration capacity of the heat exchanger system 100, improving the refrigeration effect of the heat exchanger system 100, and enhancing the energy efficiency of the heat exchanger system 100.

[0079] Other components and operations of the heat exchanger system 100, refrigeration system, and air conditioner according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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 the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Although embodiments of the invention 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 the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat exchanger system, characterized in that, For use in an air conditioner, the heat exchanger system has a first main inlet and a second main inlet and outlet, the heat exchanger system comprising: The heat exchanger comprises multiple heat exchangers, including a first heat exchanger and a second heat exchanger. The first heat exchanger includes a first body section and a first subcooling section, and the second heat exchanger includes a second body section and a second subcooling section. When the air conditioner is in cooling mode, refrigerant flows from the first total inlet and outlet to the second total inlet and outlet. One end of the first body section and one end of the second body section are both connected to the first total inlet and outlet. The refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section, respectively. The refrigerant flowing out from the first body section also flows to the second subcooling section and / or the refrigerant flowing out from the second body section also flows to the first subcooling section.

2. The heat exchanger system according to claim 1, characterized in that, When the air conditioner is in cooling mode, the refrigerant flowing out from the first body section flows to the first subcooling section and the second subcooling section, and the refrigerant flowing out from the second body section flows only to the second subcooling section. The first subcooling section has a first end and a second end, and the second subcooling section has a third end and a fourth end. The first end is connected to the first body section, the third end is connected to the second body section and the second end, and the fourth end is connected to the second main inlet and outlet.

3. The heat exchanger system according to claim 2, characterized in that, The heat exchanger system also includes: A first control valve is connected in series between the second end and the third end.

4. The heat exchanger system according to claim 2, characterized in that, The second main inlet and outlet are connected to the second end, and the heat exchanger system further includes: The second control valve is connected in series between the second main inlet / outlet and the second end.

5. The heat exchanger system according to claim 1, characterized in that, When the air conditioner is in cooling mode, the refrigerant flowing out from the first body section and the second body section flows to the first subcooling section and the second subcooling section. The first subcooling section has a first end and a second end, and the second subcooling section has a third end and a fourth end. The first end is connected to the first body section and the second body section, the second end is connected to the third end, and the fourth end is connected to the second main inlet and outlet.

6. The heat exchanger system according to claim 5, characterized in that, The second main inlet and outlet are both connected to the first body section and the second body section. The heat exchanger system also includes: A third control valve is connected in series between the second main inlet / outlet and the first body section, and between the second main inlet / outlet and the second body section.

7. The heat exchanger system according to claim 1, characterized in that, The first subcooling section has a first end and a second end, the second subcooling section has a third end and a fourth end, the first body section and the second body section are both connected to the first end, the third end is connected to the second body section and the second end, and the fourth end is connected to the second main inlet and outlet.

8. The heat exchanger system according to claim 7, characterized in that, The heat exchanger system also includes: A fourth control valve is connected in series between the second body section and the third end; A fifth control valve is connected in series between the second body section and the first end.

9. The heat exchanger system according to claim 8, characterized in that, The second main inlet and outlet are connected to the second end and the first body section, and the heat exchanger system further includes: The sixth control valve is connected in series between the second main inlet / outlet and the second end, and between the second main inlet / outlet and the first body section; A seventh control valve is connected in series between the second end and the third end.

10. The heat exchanger system according to claim 9, characterized in that, The flow path between the second main inlet / outlet and the first body section and the flow path between the second body section and the first end have a common section, and the fifth control valve is located on the common section.

11. The heat exchanger system according to claim 10, characterized in that, The heat exchanger system also includes: The eighth control valve is connected in series between the sixth control valve and the common section.

12. The heat exchanger system according to claim 1, characterized in that, The heat exchanger system also includes: The liquid distributor is a plurality of liquid distributors, including a first liquid distributor and a second liquid distributor. The first liquid distributor and the second liquid distributor correspond to the first heat exchanger and the second heat exchanger, respectively. The first liquid distributor is used to connect the first body section and the first subcooling section, and the second liquid distributor is used to connect the second body section and the second subcooling section or the first subcooling section.

13. A refrigeration system, characterized in that, Includes the heat exchanger system according to any one of claims 1-12.

14. An air conditioner, characterized in that, Includes the refrigeration system according to claim 13.

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