Heat exchange system

Abstract

The utility model discloses a heat exchange system, and relates to the technical field of heat pumps, a refrigerant flow path is formed on the heat exchange system, the refrigerant flow path comprises an outdoor flow path section and a circulation switching flow path section, the outdoor flow path section is provided with two refrigerant circulation ports, and the circulation switching flow path section is provided with two refrigerant circulation ports. A switching assembly, a first indoor heat exchanger and a second indoor heat exchanger are arranged on the circulation switching flow path section, the switching assembly switches the circulation switching flow path section to form different circulation states, so that the heat exchange system can have multiple heat exchange modes, the multiple heat exchange modes comprise a dehumidification reheating mode, and in the dehumidification reheating mode, the dehumidification reheating mode is switched between the first indoor heat exchanger and the second indoor heat exchanger. A refrigerant flows into the circulation switching flow section, releases heat through the second indoor heat exchanger, absorbs heat through the first indoor heat exchanger after being throttled and depressurized and flows back to the outdoor flow section, the multiple heat exchange modes further comprise a heating mode, and in the heating mode, the refrigerant flows into the circulation switching flow section. And after heat release of the first indoor heat exchanger and the second indoor heat exchanger, the air flows back to the outdoor flow section.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, and particularly relates to a heat exchange system. Background Art

[0002] With the improvement of people's living standards, the requirements for the comfort of the indoor environment are also getting higher and higher. Traditional air conditioners generally adjust the indoor temperature and humidity by adjusting the evaporation temperature. They need to cool down to dehumidify, and the temperature and humidity cannot be independently controlled, so the effect of dehumidifying without cooling cannot be achieved. When the dehumidification mode is turned on, the air outlet temperature of the air conditioner is too low, which has an adverse impact on the comfort of the indoor environment. For this reason, related technologies propose a three-pipe air conditioning system. Among them, the outdoor unit and the indoor unit are connected by three refrigerant pipes, so that the temperature and humidity can be independently controlled. However, this method requires adding a reheater and related components, the system control is complex, and the scheme cost is relatively high. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a heat exchange system, aiming to solve the problems of complex control and high cost of the existing three-pipe air conditioning system.

[0004] To achieve the above purpose, a heat exchange system proposed by the utility model has a refrigerant flow path formed thereon. The refrigerant flow path includes an outdoor flow section and a flow switching flow section. The outdoor flow section has two refrigerant circulation ports, and refrigerant can flow into the flow switching flow section from one of the refrigerant circulation ports, and after heat exchange, flow back to the outdoor flow section from the other refrigerant circulation port;

[0005] A switching component, a first indoor heat exchanger and a second indoor heat exchanger are provided on the flow switching flow section. The first indoor heat exchanger and the second indoor heat exchanger are arranged in a supply air duct and are arranged in sequence along the supply air direction. The switching component switches the flow switching flow section to form different flow states, so that the heat exchange system can have multiple heat exchange modes;

[0006] Multiple heat exchange modes include a dehumidification and reheating mode. In the dehumidification and reheating mode, refrigerant flows into the flow switching flow section, releases heat through the second indoor heat exchanger, flows through the first indoor heat exchanger to absorb heat after throttling and pressure reduction, and then flows back to the outdoor flow section;

[0007] Multiple heat exchange modes also include a heating mode. In the heating mode, refrigerant flows into the flow switching flow section, releases heat through both the first indoor heat exchanger and the second indoor heat exchanger at the same time, and then flows back to the outdoor flow section.

[0008] In one embodiment, the multiple heat exchange modes further include a refrigeration mode. In the refrigeration mode, the refrigerant flows into the flow path switching section, absorbs heat through the second indoor heat exchanger, then absorbs heat through the first indoor heat exchanger, and then flows back to the outdoor flow section.

[0009] In one embodiment, the multiple heat exchange modes further include a defrosting mode. In the defrosting mode, the refrigerant flows into the flow path switching section, absorbs heat through the second indoor heat exchanger, then absorbs heat through the first indoor heat exchanger, and then flows back to the outdoor flow section.

[0010] In one embodiment, the two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port. The first indoor heat exchanger has a first interface and a second interface arranged along the air supply direction, and the second indoor heat exchanger has a third interface and a fourth interface arranged along the air supply direction;

[0011] The flow path switching section includes a plurality of branch sections, and the plurality of branch sections include:

[0012] A first branch section, connected to the first refrigerant communication port and the first interface;

[0013] A second branch section, connected to the second refrigerant communication port and the second interface;

[0014] A third branch section, connected to the first refrigerant communication port and the third interface;

[0015] A fourth branch section, connected to the fourth interface and the first branch section, and a confluence communication port is formed on the first branch section; and,

[0016] A fifth branch section, connected to the fourth interface and the second refrigerant communication port;

[0017] The switching component switches the number and / or flow direction of the branch sections through which the refrigerant flowing into the flow path switching section passes, so that the heat exchange system can have multiple heat exchange modes.

[0018] In one embodiment, the switching component includes:

[0019] A first throttling element, arranged on the fourth branch section;

[0020] A first control valve, arranged on the first branch section and located between the first refrigerant communication port and the confluence communication port; and,

[0021] A second control valve, arranged on the fifth branch section.

[0022] In one embodiment, throttle the first throttling element, close the first control valve, and close the second control valve so that the heat exchange system can be in the dehumidification and reheating mode.

[0023] In one embodiment, fully open the first throttling element, close the first control valve, and close the second control valve so that the heat exchange system can be in the refrigeration mode or the defrosting mode.

[0024] In one embodiment, close the first throttling element, fully open the first control valve, and fully open the second control valve so that the heat exchange system can be in the heating mode.

[0025] In one embodiment, a compressor, a four-way valve, an outdoor heat exchanger, a second throttling element, a refrigerant radiator, and a third throttling element are sequentially arranged on the outdoor flow path section, and the four-way valve switches the flow direction of the refrigerant discharged from the exhaust port of the compressor on the outdoor flow path section.

[0026] In one embodiment, the two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port;

[0027] When the refrigerant flows out from the first refrigerant communication port to the outdoor flow path section and flows back from the second refrigerant communication port to the flow path switching section, fully open the second throttling element and throttle the third throttling element so that the heat exchange system can be in the refrigeration mode or the defrosting mode;

[0028] When the refrigerant flows out from the first refrigerant communication port to the outdoor flow path section and flows back from the second refrigerant communication port to the flow path switching section, fully open the second throttling element and fully open the third throttling element so that the heat exchange system can be in the dehumidification and reheating mode;

[0029] When the refrigerant flows out from the second refrigerant communication port to the flow path switching section and flows back from the first refrigerant communication port to the outdoor flow path section, throttle the second throttling element and fully open the third throttling element so that the heat exchange system can be in the heating mode.

[0030] In one embodiment, the refrigerant radiator has a first communication port;

[0031] The heat exchange system further includes an economizer. A first flow path and a second flow path capable of heat exchange are formed in the economizer. One end of the first flow path communicates with the first communication port of the refrigerant radiator, and the other end communicates with the injection enthalpy port of the compressor. One end of the second flow path communicates with the first communication port of the refrigerant radiator, and the other end communicates with one end of the third throttling element facing the refrigerant radiator.

[0032] In one embodiment, a fourth throttling element is further provided on the flow path where one end of the first flow channel communicates with the first communication port of the refrigerant radiator.

[0033] In one embodiment, the heat exchange system includes an air source heat exchange system.

[0034] In the technical solution of the present utility model, when dehumidification is required, the heat exchange system controls the switching component to work, so that the refrigerant flowing into the flow switching section from a refrigerant flow port of the outdoor flow section first condenses and releases heat through the second indoor heat exchanger to heat the gas flowing through the second indoor heat exchanger. After releasing heat, the refrigerant is throttled and depressurized to be converted into a low-pressure and low-temperature liquid refrigerant, and then evaporates and absorbs heat through the first indoor heat exchanger to cool and dehumidify the gas flowing through the first indoor heat exchanger. After evaporation, the refrigerant flows back to the outdoor flow section through a refrigerant flow port. When heating is required, the heat exchange system controls the switching component to work, so that the refrigerant flowing into the flow switching section from a refrigerant flow port of the outdoor flow section, wherein a part of the high-temperature and high-pressure gaseous refrigerant condenses and releases heat through the first indoor heat exchanger to heat the gas flowing through the first indoor heat exchanger, and another part of the high-temperature and high-pressure gaseous refrigerant condenses and releases heat through the second indoor heat exchanger to heat the gas flowing through the second indoor heat exchanger. After the high-pressure liquid refrigerants released from heat by the first indoor heat exchanger and the second indoor heat exchanger are combined, they flow back to the outdoor flow section through another refrigerant flow port. Thus, by providing two refrigerant flow ports to connect the outdoor unit and the indoor unit of the heat exchange system, the refrigerant can circulate between the indoor unit and the outdoor unit, so that the heat exchange system can form a two-pipe heat exchange structure to reduce the cost of the heat exchange system. At the same time, through the action of the switching component, the heat exchange system can not only heat the gas in the air supply duct by the first indoor heat exchanger and the second indoor heat exchanger simultaneously in the heating mode to improve the heating effect of the heat exchange system, but also cool and dehumidify the gas in the air supply duct first and then heat and exchange heat in the dehumidification mode, so that the two-pipe heat exchange system can achieve the effect of dehumidification without temperature reduction, and reduce the cost of the heat exchange system on the premise of ensuring dehumidification without temperature reduction, thereby solving the problems of complex control and high cost of the existing three-pipe air conditioning system. Description of the Drawings

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0036] Figure 1 It is a schematic structural diagram of an embodiment of the heat exchange system provided by the present invention;

[0037] Figure 2 It is a schematic structural diagram of another embodiment of the heat exchange system provided by the present invention.

[0038] Explanation of the reference numerals in the drawings:

[0039] 100, heat exchange system; 1, outdoor flow section; 11, compressor; 12, four-way valve; 13, outdoor heat exchanger; 14, second throttling element; 15, refrigerant radiator; 16, third throttling element; 2, flow switching flow section; 21, first branch section; 22, second branch section; 23, third branch section; 24, fourth branch section; 25, fifth branch section; 3, switching assembly; 31, first throttling element; 32, first control valve; 33, second control valve; 41, first indoor heat exchanger; 42, second indoor heat exchanger; 5, economizer; 51, fourth throttling element.

[0040] The realization of the object, functional characteristics and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. Specific embodiments

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0042] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0044] With the improvement of people's living standards, the requirements for the comfort of the indoor environment are also getting higher and higher. Traditional air conditioners generally adjust the indoor temperature and humidity by adjusting the evaporation temperature. They need to cool down to dehumidify, and the temperature and humidity cannot be controlled independently, so it is impossible to achieve the effect of dehumidifying without cooling down. As a result, when the dehumidification mode is turned on, the air outlet temperature of the air conditioner is too low, which has an adverse impact on the comfort of the indoor environment. For this reason, the related art proposes a three-pipe air conditioning system. Among them, the outdoor unit and the indoor unit are connected by three refrigerant pipes, so that the temperature and humidity can be independently controlled. However, this method requires adding a reheater and related components, the system control is complex, and the solution cost is relatively high.

[0045] Based on this, the present utility model proposes a heat exchange system, aiming to solve the problems of complex control and high cost of the existing three-pipe air conditioning system. Among them, Figures 1 to 2 It is a schematic structural diagram of the heat exchange system provided by the present utility model.

[0046] Please refer to Figure 1, in an embodiment of the present utility model, a refrigerant flow path is formed on the heat exchange system 100. The refrigerant flow path includes an outdoor flow section 1 and a flow switching flow section 2. The outdoor flow section 1 has two refrigerant circulation ports. Refrigerant can flow into the flow switching flow section 2 from one of the refrigerant circulation ports. After heat exchange, it flows back to the outdoor flow section 1 from the other refrigerant circulation port. A switching component 3, a first indoor heat exchanger 41 and a second indoor heat exchanger 42 are provided on the flow switching flow section 2. The first indoor heat exchanger 41 and the second indoor heat exchanger 42 are arranged in the air supply duct and are arranged in sequence along the air supply direction. The switching component 3 switches the flow switching flow section 2 to form different flow states, so that the heat exchange system 100 can have multiple heat exchange modes. The multiple heat exchange modes include a dehumidification and reheating mode. In the dehumidification and reheating mode, the refrigerant flows into the flow switching flow section 2, releases heat through the second indoor heat exchanger 42, flows through the first indoor heat exchanger 41 to absorb heat after throttling and pressure reduction, and then flows back to the outdoor flow section 1. The multiple heat exchange modes also include a heating mode. In the heating mode, the refrigerant flows into the flow switching flow section 2, and after releasing heat through both the first indoor heat exchanger 41 and the second indoor heat exchanger 42, it flows back to the outdoor flow section 1.

[0047] In the technical solution of the present utility model, when dehumidification is required, the heat exchange system 100 controls the switching component 3 to operate, so that the refrigerant flowing into the flow switching section from a refrigerant circulation port of the outdoor flow section 1 first condenses and releases heat through the second indoor heat exchanger 42 to heat the gas flowing through the second indoor heat exchanger 42. After releasing heat, the refrigerant is throttled and depressurized to be converted into a low-pressure and low-temperature liquid refrigerant, and then evaporates and absorbs heat through the first indoor heat exchanger 41 to cool and dehumidify the gas flowing through the first indoor heat exchanger. After evaporation, the refrigerant flows back to the outdoor flow section 1 through the other refrigerant circulation port. When heating is required, the heat exchange system 100 controls the switching component 3 to operate, so that the refrigerant flowing into the flow switching section from a refrigerant circulation port of the outdoor flow section 1, where a part of the high-temperature and high-pressure gaseous refrigerant condenses and releases heat through the first indoor heat exchanger 41 to heat the gas flowing through the first indoor heat exchanger 41, and another part of the high-temperature and high-pressure gaseous refrigerant condenses and releases heat through the second indoor heat exchanger 42 to heat the gas flowing through the second indoor heat exchanger 42. After the high-pressure liquid refrigerant released heat by the first indoor heat exchanger 41 and the second indoor heat exchanger 42 converges, it flows back to the outdoor flow section 1 through the other refrigerant circulation port. In this way, by setting two refrigerant flow ports, the outdoor unit and the indoor unit of the heat exchange system 100 are connected, so that the refrigerant can circulate between the indoor unit and the outdoor unit, enabling the heat exchange system 100 to form a two-pipe heat exchange structure, thereby reducing the cost of the heat exchange system 100. At the same time, through the operation of the switching component 3, the heat exchange system 100 can not only heat the gas in the air supply duct simultaneously by the first indoor heat exchanger 41 and the second indoor heat exchanger 42 in the heating mode, improving the heating effect of the heat exchange system 100, but also cool and dehumidify the gas in the air supply duct first and then heat it through heat exchange in the dehumidification mode, enabling the two-pipe heat exchange system 100 to achieve the effect of dehumidification without temperature reduction. On the premise of ensuring dehumidification without temperature reduction, the cost of the heat exchange system 100 is reduced, thus solving the problems of complex control and high cost of the existing three-pipe air conditioning system.

[0048] Further, the multiple heat exchange modes further include a refrigeration mode. In the refrigeration mode, the refrigerant flows into the flow switching section 2, absorbs heat through the second indoor heat exchanger 42, and then flows through the first indoor heat exchanger 41 to absorb heat, and then flows back to the outdoor flow section 1. In this way, the heat exchange system 100 controls the switching component 3 to operate, so that the low-temperature and low-pressure liquid refrigerant flowing into the flow switching section from a refrigerant circulation port of the outdoor flow section 1 evaporates and absorbs heat successively through the second indoor heat exchanger 42 and the first indoor heat exchanger 41 to be converted into a medium-temperature and low-pressure gaseous refrigerant, and then flows back to the outdoor flow section 1 through the other refrigerant circulation port.

[0049] In an embodiment of the present utility model, the multiple heat exchange modes further include a defrosting mode. In the defrosting mode, the refrigerant flows into the flow switching flow section 2, absorbs heat through the second indoor heat exchanger 42, then flows through the first indoor heat exchanger 41 to absorb heat, and then flows back to the outdoor flow section 1. Thus, the heat exchange system 100 controls the switching component 3 to work, so that the low-temperature and low-pressure liquid refrigerant flowing into the flow switching flow section from a refrigerant circulation port of the outdoor flow section 1 evaporates and absorbs heat through the second indoor heat exchanger 42 and the first indoor heat exchanger 41 in sequence to be converted into a medium-temperature and low-pressure gaseous refrigerant, and then flows back to the outdoor flow section 1 through another refrigerant circulation port.

[0050] In an embodiment of the present utility model, please refer to Figure 1, the two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port. The first indoor heat exchanger 41 has a first interface and a second interface arranged along the air supply direction, and the second indoor heat exchanger 42 has a third interface and a fourth interface arranged along the air supply direction. The flow switching flow section 2 includes a plurality of branch sections, and the plurality of branch sections include a first branch section 21, a second branch section 22, a third branch section 23, a fourth branch section 24, and a fifth branch section 25. The first branch section 21 is connected to the first refrigerant communication port and the first interface, the second branch section 22 is connected to the second refrigerant communication port and the second interface, the third branch section 23 is connected to the first refrigerant communication port and the third interface, the fourth branch section 24 is connected to the fourth interface and the first branch section 21, and a confluence communication port is formed on the first branch section 21. The fifth branch section 25 is connected to the fourth interface and the second refrigerant communication port. The switching component 3 switches the number and / or flow direction of the branch sections through which the refrigerant flowing into the flow switching flow section 2 passes, so that the heat exchange system 100 can have multiple heat exchange modes. Thus, by providing the first branch section 21 and the third branch section 23, the first refrigerant flow port is respectively connected to the first indoor heat exchanger 41 and the second indoor heat exchanger 42, so that the refrigerant flowing out of the first refrigerant flow port can flow into the first indoor heat exchanger 41 through the first branch section 21 and can also flow into the second indoor heat exchanger 42 through the third branch section 23. By providing the second branch section 22, the second refrigerant flow port is connected to the first indoor heat exchanger 41, so that the refrigerant flowing out of the first indoor heat exchanger 41 can flow back to the outdoor flow section 1 through the second refrigerant flow port. By providing the fourth branch section 24, the first indoor heat exchanger 41 is connected to the second indoor heat exchanger 42, so that the refrigerant flowing out of the second indoor heat exchanger 42 can flow into the first indoor heat exchanger 41. At the same time, by providing the fifth branch section 25, the second indoor heat exchanger 42 is connected to the second refrigerant flow port, so that the refrigerant flowing out of the second indoor heat exchanger 42 can flow back to the outdoor flow section 1 through the second refrigerant flow port. In addition, the switching component 3 controls the flow direction of the refrigerant on the flow switching flow section 2, so that the heat exchange system 100 can form different heat exchange modes.

[0051] Further, the switching component 3 includes a first throttling element 31, a first control valve 32, and a second control valve 33. The first throttling element 31 is disposed on the fourth branch section 24, the first control valve 32 is disposed on the first branch section 21 and is located between the first refrigerant communication port and the confluence communication port, and the second control valve 33 is disposed on the fifth branch section 25. Thus, by providing the first throttling element 31, the on / off or throttling of the fourth branch section 24 can be controlled. By providing the first control valve 32, the on / off of the first branch section 21 can be controlled. And by providing the second control valve 33, the on / off of the fifth branch section 25 can be controlled, so that the switching component 3 can adjust the flow direction of the refrigerant on the flow switching flow path section 2 by controlling the actions of the first throttling element 31, the first control valve 32, and the second control valve 33, enabling the heat exchange system 100 to form different heat exchange modes.

[0052] It should be noted that there are various types of the first throttling element 31, which can be an electronic expansion valve or a thermostatic expansion valve, etc. The present invention does not limit this. Similarly, there are various types of the first control valve 32 and the second control valve 33, which can be solenoid valves or electronic expansion valves, etc. The present invention does not limit this.

[0053] In order to enable the heat exchange system 100 to form the dehumidification and reheating mode, in an embodiment of the present invention, please refer to Figure 1 , throttle the first throttling element 31, close the first control valve 32, and close the second control valve 33, so that the heat exchange system 100 can be in the dehumidification and reheating mode. Thus, the refrigerant flowing out of a refrigerant flow port of the outdoor flow path section 1 first flows into the second indoor heat exchanger 42 through the third branch section 23. The medium-temperature and high-pressure gaseous refrigerant condenses and releases heat in the second indoor heat exchanger 42 and is converted into a low-temperature and high-pressure liquid refrigerant to heat the gas flowing through the second indoor heat exchanger 42. The low-temperature and high-pressure liquid refrigerant flowing out of the second indoor heat exchanger 42 flows into the first indoor heat exchanger 41 through the fourth branch section 24, enabling the first throttling element 31 on the fourth branch section 24 to throttle and depressurize the low-temperature and high-pressure liquid refrigerant to convert it into a low-temperature and low-pressure liquid refrigerant. The refrigerant evaporates and absorbs heat in the first indoor heat exchanger 41, enabling the low-temperature and low-pressure liquid refrigerant to be converted into a low-temperature and low-pressure gaseous refrigerant to cool and dehumidify the gas flowing through the first indoor heat exchanger 41. The refrigerant flowing out of the first indoor heat exchanger 41 flows back to the outdoor flow path section 1 through the second branch section 22, thereby enabling the heat exchange system 100 to form the dehumidification and reheating mode.

[0054] In order to enable the heat exchange system 100 to form the cooling mode or the defrosting mode, in one embodiment of the present invention, refer to Figure 1 , control the first throttling element 31 to be fully opened, control the first control valve 32 to be closed, and control the second control valve 33 to be closed, so that the heat exchange system 100 can be in the cooling mode or the defrosting mode. In this way, the refrigerant flowing out of a refrigerant flow port of the outdoor flow section 1 first flows into the second indoor heat exchanger 42 through the third branch section 23, and the low-temperature and low-pressure liquid refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant after evaporating and absorbing heat in the second indoor heat exchanger 42, so as to cool the gas flowing through the second indoor heat exchanger 42. The low-temperature and low-pressure gaseous refrigerant flowing out of the second indoor heat exchanger 42 flows into the first indoor heat exchanger 41 through the fourth branch section 24. The refrigerant evaporates and absorbs heat in the first indoor heat exchanger 41, so that the low-temperature and low-pressure gaseous refrigerant can be converted into medium-temperature and low-pressure gaseous refrigerant to cool the gas flowing through the first indoor heat exchanger 41. The refrigerant flowing out of the first indoor heat exchanger 41 flows back to the outdoor flow section 1 through the second branch section 22, so that the heat exchange system 100 can form the refrigeration mode or the defrost mode.

[0055] In order to enable the heat exchange system 100 to form the heating mode, in one embodiment of the present invention, please refer to Figure 1 , control the first throttling element 31 to be closed, control the first control valve 32 to be fully opened, and control the second control valve 33 to be fully opened, so that the heat exchange system 100 can be in the heating mode. In this way, a part of the refrigerant flowing out of a refrigerant flow port of the outdoor flow section 1 flows into the second indoor heat exchanger 42 through the fifth branch section 25, and the high-temperature and high-pressure refrigerant is converted into a medium-temperature and high-pressure refrigerant after condensing and releasing heat in the second indoor heat exchanger 42, so as to heat and increase the temperature of the gas flowing through the second indoor heat exchanger 42, and the refrigerant after heat exchange flows back to the second indoor heat exchanger 42 through the third branch section 23. Another part of the refrigerant flow outlet of the outdoor flow section 1, and another part flows into the first indoor heat exchanger 41 through the second branch section 22. The high-temperature and high-pressure refrigerant condenses and releases heat in the first indoor heat exchanger 41 to heat and increase the temperature of the gas flowing through the first indoor heat exchanger 41. The refrigerant after heat exchange is merged into the other refrigerant flow outlet of the outdoor flow section 1 through the first branch section 21, so that the first indoor heat exchanger 41 and the second indoor heat exchanger 42 can both heat the gas in the air supply duct, thereby enabling the heat exchange system 100 to form the heating mode.

[0056] In an embodiment of the present utility model, a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, a second throttling element 14, a refrigerant radiator 15, and a third throttling element 16 are sequentially provided on the outdoor flow path section 1. The four-way valve 12 switches the flow direction of the refrigerant discharged from the exhaust port of the compressor 11 on the outdoor flow path section 1. By providing the compressor 11, the refrigerant can be compressed. By providing the outdoor heat exchanger 13, the refrigerant can exchange heat with outdoor air. By providing the second throttling element 14 and the third throttling element, the on / off of the outdoor flow path section 1 can be controlled or the refrigerant on the outdoor flow path section 1 can be throttled. By providing the refrigerant radiator 15, the circuit board assembly of the heat exchange system 100 can be cooled. At the same time, by providing the four-way valve 12, the outdoor heat exchanger 13 can be connected to both the intake port and the exhaust port of the compressor 11, so that the heat exchange system 100 can form multiple working modes.

[0057] It can be understood that theoretically, setting one throttling element on the outdoor flow path section 1 can meet the requirements. However, since the refrigerant radiator 15 is provided on the outdoor flow path section 1, if only the second throttling element 14 is provided, in the cooling mode of the heat exchange system 100, the second throttling element 14 needs to throttle the refrigerant. At this time, the refrigerant radiator 15 may condense, which may affect the operation of the circuit board assembly corresponding to the refrigerant radiator 15. Similarly, if only the third throttling element 16 is provided, in the heating mode of the heat exchange system 100, the refrigerant radiator 15 may also condense. Therefore, the second throttling element 14 and the third throttling element 16 need to be provided at both ends of the refrigerant radiator 15. Further, there are various types of the second throttling element 14 and the third throttling element 16, which can be electronic expansion valves or thermal expansion valves, etc. The present utility model does not limit this.

[0058] In an embodiment of the present utility model, the two refrigerant flow ports include a first refrigerant connection port and a second refrigerant connection port. When the refrigerant flows out from the first refrigerant connection port to the flow switching flow section 2 and flows back to the outdoor flow section 1 from the second refrigerant connection port, the second throttling element 14 is controlled to be fully open, and the third throttling element 16 is throttled, so that the heat exchange system 100 can be in a refrigeration mode or a defrosting mode. In this mode, the exhaust port of the compressor 11 is communicated with the outdoor heat exchanger 13, so that the high-temperature and high-pressure refrigerant flowing out of the compressor 11 condenses and releases heat in the outdoor heat exchanger 13, so as to convert the high-temperature and high-pressure refrigerant into a medium-temperature and high-pressure refrigerant. After the heat-exchanged refrigerant sequentially flows through the second throttling element 14 and the refrigerant radiator 15, it is throttled and depressurized in the third throttling element 16, so as to convert the medium-temperature and high-pressure refrigerant into a low-temperature and low-pressure refrigerant, and then flows into the flow switching flow section 2 through the first refrigerant flow port, so that the refrigerant can evaporate and absorb heat in the first indoor heat exchanger 41 and the second indoor heat exchanger 42 on the flow switching flow section 2, so as to cool and lower the temperature of the gas in the air supply duct, or can melt the frost on the outdoor heat exchanger 13.

[0059] In an embodiment of the present utility model, the two refrigerant flow ports include a first refrigerant connection port and a second refrigerant connection port. When the refrigerant flows out from the first refrigerant connection port to the flow switching flow section 2 and flows back to the outdoor flow section 1 from the second refrigerant connection port, the second throttling element 14 is controlled to be fully open, and the third throttling element 16 is fully open, so that the heat exchange system 100 can be in a dehumidification and reheating mode. In this mode, the exhaust port of the compressor 11 is communicated with the outdoor heat exchanger 13, so that the high-temperature and high-pressure refrigerant flowing out of the compressor 11 condenses and releases heat in the outdoor heat exchanger 13, so as to convert the high-temperature and high-pressure refrigerant into a medium-temperature and high-pressure refrigerant. After the heat-exchanged refrigerant sequentially flows through the second throttling element 14, the refrigerant radiator 15 and the third throttling element 16, it flows into the flow switching flow section 2 through the first refrigerant flow port, so that the refrigerant can first condense and release heat on the second indoor heat exchanger 42 on the flow switching flow section 2, and then evaporate and absorb heat on the first indoor heat exchanger 41, so that the gas in the air supply duct is first cooled and dehumidified, and then heated and raised in temperature, so as to achieve the effect of dehumidification without temperature reduction.

[0060] In an embodiment of the present utility model, the two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port. When the refrigerant flows out from the second refrigerant communication port to the flow path switching section 2 and flows back to the outdoor section 1 from the first refrigerant communication port, the second throttling element 14 is controlled to throttle, and the third throttling element 16 is fully opened, so that the heat exchange system 100 can be in the heating mode. In this mode, the refrigerant flowing into the flow path switching section from the second refrigerant flow port is respectively condensed and heat-exchanged by the first indoor heat exchanger 41 and the second indoor heat exchanger 42, and then flows into the outdoor section 1 through the first refrigerant flow port. Then, it sequentially passes through the third throttling element 16 and the refrigerant heat exchanger, and is throttled and depressurized in the second throttling element 14 to convert the medium-temperature and high-pressure refrigerant into a low-temperature and low-pressure refrigerant. The depressurized refrigerant flows into the outdoor heat exchanger 13 for evaporation and heat absorption to convert the low-temperature and low-pressure liquid refrigerant into a low-temperature and low-pressure gaseous refrigerant. The heat-exchanged refrigerant then flows back to the compressor 11.

[0061] In an embodiment of the present utility model, please refer to Figure 2 , the refrigerant radiator 15 has a first communication port. The heat exchange system 100 further includes an economizer 5. A first flow path and a second flow path capable of heat exchange are formed in the economizer 5. One end of the first flow path communicates with the first communication port of the refrigerant radiator 15, and the other end communicates with the injection enthalpy port of the compressor 11. One end of the second flow path communicates with the first communication port of the refrigerant radiator 15, and the other end communicates with one end of the third throttling element 16 facing the refrigerant radiator 15. In this way, by providing the economizer 5, a part of the refrigerant on the outdoor section 1 can flow into the flow path switching section 2 through the second flow path and the third throttling element 16, and another part of the refrigerant can directly flow into the injection enthalpy port of the compressor 11 through the first flow path to supplement the refrigerant amount and increase the exhaust volume of the compressor 11. When the outdoor temperature is too low, the problem of power reduction of the compressor 11 caused by the outdoor environment can be improved, so as to meet the requirements of users for the indoor environment comfort in complex and extreme environments. Further, a fourth throttling element 51 is further provided on the flow path where one end of the first flow path communicates with the first communication port of the refrigerant radiator 15. In this way, by providing the fourth throttling element 51, the refrigerant flowing into the first flow path is throttled to reduce the temperature of the refrigerant flowing into the first flow path, so that the refrigerant on the first flow path can exchange heat with the refrigerant on the second flow path, thereby cooling the refrigerant on the second flow path.

[0062] There are various types of the heat exchange system 100. In this embodiment, the heat exchange system 100 includes an air source heat exchange system 100. Of course, in other embodiments, the heat exchange system 100 may also be an air conditioning system or the like, and the present utility model does not limit this.

[0063] The heat exchange system 100 provided by the present utility model has multiple working modes, including a refrigeration mode, a dehumidification and reheating mode, a heating mode, and a defrosting mode. The following will take the above-mentioned embodiments as an example to Figure 1 illustrate the working modes of the heat exchange system 100.

[0064] When the heat exchange system 100 is in the refrigeration mode, the second throttling element 14 is fully open, the third throttling element 16 throttles, the first throttling element 31 is fully open, the first control valve 32 and the second control valve 33 are closed, and the refrigerant flow path is as follows: the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 11 first flows into the outdoor heat exchanger 13 through the four-way valve 12 to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. After heat exchange, the refrigerant sequentially passes through the second throttling element 14 and then throttles in the third throttling element 16 to convert the medium-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant. Then, it sequentially flows into the second indoor heat exchanger 42 and the first indoor heat exchanger 41 to evaporate and absorb heat. After heat exchange, the refrigerant flows into the compressor 11 through the four-way valve 12 to be converted into a high-temperature and high-pressure gaseous refrigerant.

[0065] When the heat exchange system 100 is in the dehumidification and reheating mode, the second throttling element 14 is fully open, the third throttling element 16 is fully open, the first throttling element 31 throttles, the first control valve 32 and the second control valve 33 are closed, and the refrigerant flow path is as follows: the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 11 first flows into the outdoor heat exchanger 13 through the four-way valve 12 for condensation and heat release to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. After heat exchange, the refrigerant sequentially passes through the second throttling element 14 and the third throttling element 16 and then flows into the second indoor heat exchanger 42 for condensation and heat release to convert the medium-temperature and high-pressure liquid refrigerant into a low-temperature and high-pressure liquid refrigerant. Then, it flows into the first throttling element 31 for throttling to convert the low-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant. The throttled refrigerant flows into the first indoor heat exchanger 41 for evaporation and absorption of heat. After heat exchange, the refrigerant flows into the compressor 11 through the four-way valve 12 to be converted into a high-temperature and high-pressure gaseous refrigerant.

[0066] When the heat exchange system 100 is in the heating mode, the second throttling element 14 throttles, the third throttling element 16 is fully open, the first throttling element 31 is closed, the first control valve 32 and the second control valve 33 are open, and the refrigerant flow path is as follows: The high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 11, after passing through the four-way valve 12, respectively flows into the first indoor heat exchanger 41 and the second indoor heat exchanger 42 for condensation and heat release, so as to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. After the heat-exchanged refrigerants converge, they flow into the second throttling element 14 through the third throttling element 16 and throttle in the second throttling element 14 to convert the medium-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant. The throttled refrigerant flows into the outdoor heat exchanger 13 for evaporation and heat absorption, and the heat-exchanged refrigerant then flows into the compressor 11 through the four-way valve 12 to be converted into a high-temperature and high-pressure gaseous refrigerant.

[0067] When the heat exchange system 100 is in the defrosting mode, the second throttling element 14 is fully open, the third throttling element 16 throttles, the first throttling element 31 is fully open, the first control valve 32 and the second control valve 33 are closed, and the refrigerant flow path is as follows: The high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 11 first flows into the outdoor heat exchanger 13 through the four-way valve 12 to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. The heat-exchanged refrigerant then passes through the second throttling element 14 and throttles in the third throttling element 16 to convert the medium-temperature and high-pressure liquid refrigerant into a low-temperature and low-pressure liquid refrigerant, and then successively flows into the second indoor heat exchanger 42 and the first indoor heat exchanger 41 for evaporation and heat absorption. The heat-exchanged refrigerant flows into the compressor 11 through the four-way valve 12 to be converted into a high-temperature and high-pressure gaseous refrigerant.

[0068] The above is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A heat exchange system, characterized in that: A refrigerant flow path is formed on the heat exchange system, and the refrigerant flow path includes an outdoor flow path section and a circulation switching flow path section. The outdoor flow path section has two refrigerant flow openings, and the refrigerant can flow into the circulation switching flow path section from one of the refrigerant flow openings, and after heat exchange, flow back to the outdoor flow path section from the other refrigerant flow opening; A switching component, a first indoor heat exchanger and a second indoor heat exchanger are provided on the circulation switching flow section. The first indoor heat exchanger and the second indoor heat exchanger are arranged in the air supply duct and arranged in sequence along the air supply direction. The switching component switches the circulation switching flow section to form different circulation states, so that the heat exchange system can have multiple heat exchange modes. The plurality of heat exchange modes include a dehumidification and reheating mode, in which the refrigerant flows into the circulation switching flow section, releases heat through the second indoor heat exchanger, absorbs heat through the first indoor heat exchanger after throttling and reducing pressure, and flows back to the outdoor flow section; The multiple heat exchange modes also include a heating mode. In the heating mode, the refrigerant flows into the circulation switching flow section, and after releasing heat through the first indoor heat exchanger and the second indoor heat exchanger, flows back to the outdoor flow section.

2. The heat exchange system according to claim 1, characterized in that: The multiple heat exchange modes also include a cooling mode. In the cooling mode, the refrigerant flows into the circulation switching flow section, absorbs heat through the second indoor heat exchanger, then flows through the first indoor heat exchanger to absorb heat, and then flows back to the outdoor flow section.

3. The heat exchange system according to claim 1, characterized in that: The various heat exchange modes also include a defrost mode. In the defrost mode, the refrigerant flows into the circulation switching flow section, absorbs heat through the second indoor heat exchanger, then flows through the first indoor heat exchanger to absorb heat, and then flows back to the outdoor flow section.

4. The heat exchange system according to claim 1, characterized in that: The two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port, the first indoor heat exchanger has a first interface and a second interface arranged along the air supply direction, and the second indoor heat exchanger has a third interface and a fourth interface arranged along the air supply direction; The circulation switching flow path section includes a plurality of branch paths, and the plurality of branch paths include: A first branch section connected to the first refrigerant communication port and the first interface; A second branch section connected to the second refrigerant communication port and the second interface; A third branch section is connected to the first refrigerant communication port and the third interface; a fourth branch section connected to the fourth interface and the first branch section, and having a converging communication port formed on the first branch section; and a fifth branch section connected to the fourth interface and the second refrigerant communication port; The switching component switches the number and / or flow direction of the branch sections through which the refrigerant flowing into the circulation switching flow section passes, so that the heat exchange system can have multiple heat exchange modes.

5. The heat exchange system according to claim 4, characterized in that: The switching component comprises: A first throttling element is arranged on the fourth branch section; a first control valve, disposed on the first branch section and between the first refrigerant communication port and the converging communication port; and The second control valve is arranged on the fifth branch section.

6. The heat exchange system according to claim 5, characterized in that: The first throttling element is controlled to throttle, the first control valve is controlled to close, and the second control valve is controlled to close, so that the heat exchange system can be in a dehumidification and reheating mode.

7. The heat exchange system according to claim 5, characterized in that: The first throttling element is controlled to be fully opened, the first control valve is controlled to be closed, and the second control valve is controlled to be closed, so that the heat exchange system can be in a cooling mode or a defrosting mode.

8. The heat exchange system according to claim 5, characterized in that: The first throttling element is controlled to be closed, the first control valve is controlled to be fully opened, and the second control valve is controlled to be fully opened, so that the heat exchange system can be in the heating mode.

9. The heat exchange system according to claim 1, characterized in that: A compressor, a four-way valve, an outdoor heat exchanger, a second throttling element, a refrigerant radiator and a third throttling element are sequentially arranged on the outdoor flow section. The four-way valve switches the flow direction of the refrigerant discharged from the exhaust port of the compressor on the outdoor flow section.

10. The heat exchange system according to claim 9, characterized in that: The two refrigerant flow ports include a first refrigerant communication port and a second refrigerant communication port; When the refrigerant flows out from the first refrigerant communication port to the circulation switching flow section and flows back from the second refrigerant communication port to the outdoor flow section, the second throttling element is controlled to be fully opened and the third throttling element is throttled, so that the heat exchange system can be in a cooling mode or a defrosting mode; When the refrigerant flows out from the first refrigerant communication port to the circulation switching flow section and flows back from the second refrigerant communication port to the outdoor flow section, the second throttling element is controlled to be fully opened and the third throttling element is controlled to be fully opened so that the heat exchange system can be in a dehumidification and reheating mode; When the refrigerant flows out from the second refrigerant connecting port to the circulation switching flow section and flows back from the first refrigerant connecting port to the outdoor flow section, the second throttling element is controlled to throttle and the third throttling element is fully opened so that the heat exchange system can be in heating mode.

11. The heat exchange system according to claim 9, characterized in that: The refrigerant radiator has a first communication port; The heat exchange system also includes an economizer, in which a first flow channel and a second flow channel capable of heat exchange are formed, one end of the first flow channel is connected to the first connecting port of the refrigerant radiator, and the other end is connected to the injection enthalpy port of the compressor, one end of the second flow channel is connected to the first connecting port of the refrigerant radiator, and the other end is connected to one end of the third throttling element toward the refrigerant radiator.

12. The heat exchange system according to claim 11, characterized in that: A fourth throttling element is also provided on a flow path connected to one end of the first flow channel and the first connecting port of the refrigerant radiator.

13. The heat exchange system according to any one of claims 1 to 12, characterized in that: The heat exchange system includes an air source heat exchange system.

Images