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, a refrigerant can flow into the circulation switching flow path section from one refrigerant circulation port, and after heat exchange, the refrigerant can flow into the circulation switching flow path section from the other refrigerant circulation port. The circulation switching flow section is provided with a switching assembly, a first indoor heat exchanger and a second indoor heat exchanger, the switching assembly switches the circulation switching flow section to form different circulation states, so that the heat exchange system can have multiple heat exchange modes, and the multiple heat exchange modes comprise the dehumidification reheating mode, the dehumidification reheating mode and the dehumidification reheating mode. In the dehumidification reheating mode, a refrigerant flows into the circulation switching flow path 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 flows back to the outdoor flow path 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 requirement for the comfort of the indoor environment is 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 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 the refrigerant can flow into the flow switching flow section from one of the refrigerant circulation ports, and after heat exchange, it flows 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 the air supply duct and are arranged in sequence along the air supply 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, the refrigerant flows into the flow switching flow section, releases heat through the second indoor heat exchanger, and after throttling and depressurizing, flows through the first indoor heat exchanger to absorb heat and then flows back to the outdoor flow section.

[0007] In an embodiment, multiple heat exchange modes further include a refrigeration mode. In the refrigeration mode, the refrigerant flows into the flow switching flow section, absorbs heat through the second indoor heat exchanger, and then flows through the first indoor heat exchanger to absorb heat and then flows back to the outdoor flow section.

[0008] In one embodiment, the multiple heat exchange modes further include a heating mode. In the heating mode, the refrigerant flows into the flow path switching section, releases heat after passing 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, and then flows through the first indoor heat exchanger to absorb heat before flowing back to the outdoor flow section.

[0010] In one embodiment, the two refrigerant ports include a first refrigerant connection port and a second refrigerant connection 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 connection port and the first interface;

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

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

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

[0016] 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.

[0017] In one embodiment, the switching component includes:

[0018] A first throttling element, arranged on the fourth branch section;

[0019] A first control valve, arranged on the first branch section and located between the first refrigerant connection port and the confluence connection port; and,

[0020] A second control valve, arranged on the third branch section.

[0021] In one embodiment, control the first throttling element to throttle, control the first control valve to close, and control the second control valve to fully open, so that the heat exchange system can be in the dehumidification and reheating mode.

[0022] In one embodiment, the first throttling element is controlled to be fully open, the first control valve is controlled to be closed, and the second control valve is controlled to be fully open, so that the heat exchange system can be in a refrigeration mode or a defrosting mode.

[0023] In one embodiment, the first throttling element is controlled to be closed, the first control valve is controlled to be fully open, and the second control valve is controlled to be closed, so that the heat exchange system can be in a heating mode.

[0024] 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 provided 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.

[0025] In one embodiment, the two refrigerant communication ports include a first refrigerant communication port and a second refrigerant communication port;

[0026] When the refrigerant flows out from the first refrigerant communication port to the flow path switching section and flows back from the second refrigerant communication port to the outdoor flow path section, the second throttling element is controlled to be fully open and the third throttling element is throttled, so that the heat exchange system can be in a refrigeration mode or a defrosting mode;

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

[0028] 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, the second throttling element is throttled and the third throttling element is fully open, so that the heat exchange system can be in a heating mode.

[0029] In one embodiment, the refrigerant radiator has a first communication port;

[0030] 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.

[0031] In one embodiment, the heat exchange system includes an air source heat pump system.

[0032] 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 the other refrigerant flow port. In this way, by setting two refrigerant flow ports, the outdoor unit and the indoor unit of the heat exchange system are connected, so that the refrigerant can circulate between the indoor unit and the outdoor unit, enabling the heat exchange system to form a two-pipe heat exchange structure, thereby reducing the cost of the heat exchange system. At the same time, through the action of the switching component, the heat exchange system can first cool and dehumidify the gas in the air supply duct and then perform heat exchange and heating, enabling the two-pipe heat exchange system 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 is reduced, thus solving the problems of complex control and high cost of the existing three-pipe air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 FIG. is a schematic structural diagram of an embodiment of the heat exchange system provided by the present utility model;

[0035] Figure 2 FIG. is a schematic structural diagram of another embodiment of the heat exchange system provided by the present utility model.

[0036] Explanation of the reference numerals in the drawings:

[0037] 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 section; 21, first branch section; 22, second branch section; 23, third branch section; 24, fourth branch section; 3, switching component; 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.

[0038] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0040] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, 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.

[0041] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0042] 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 have proposed 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 cost of the solution is relatively high.

[0043] 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 Structural schematic diagram of the heat exchange system provided by the present utility model.

[0044] Please refer to Figure 1 , in an embodiment of the present utility model, a refrigerant flow path is formed on the heat exchange system. 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 assembly 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 assembly 3 switches the flow switching flow section 2 to form different flow states, so that the heat exchange system can have multiple heat exchange modes. 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 after throttling and depressurizing to absorb heat, and then flows back to the outdoor flow section 1.

[0045] In the technical solution of the present utility model, when dehumidification is required, the heat exchange system controls the switching assembly 3 to work, so that the refrigerant flowing from one refrigerant circulation port of the outdoor flow section 1 into the flow switching flow section first condenses and releases heat through the second indoor heat exchanger 42 to heat the gas flowing through the second indoor heat exchanger 42. The refrigerant after releasing heat 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. The evaporated refrigerant 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 are connected, so that the refrigerant can circulate between the indoor unit and the outdoor unit, enabling the heat exchange system to form a two-pipe heat exchange structure, thereby reducing the cost of the heat exchange system. At the same time, through the action of the switching assembly 3, the heat exchange system can first cool and dehumidify the gas in the air supply duct and then heat up through heat exchange, enabling the two-pipe heat exchange system 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 is reduced, thus solving the problems of complex control and high cost of the existing three-pipe air conditioning system.

[0046] Furthermore, 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, then absorbs heat through the first indoor heat exchanger 41, and then flows back to the outdoor flow section 1. In this way, the heat exchange system controls the switching component 3 to work, so that the low-temperature and low-pressure liquid refrigerant flowing into the flow switching section from a refrigerant flow port of the outdoor flow section 1 absorbs heat and evaporates successively through the second indoor heat exchanger 42 and the first indoor heat exchanger 41 to be converted into low-temperature and low-pressure gaseous refrigerant, and then flows back to the outdoor flow section 1 through another refrigerant flow port.

[0047] In an embodiment of the present invention, the multiple heat exchange modes further include a heating mode. In the heating mode, the refrigerant flows into the flow switching section 2, releases heat through the first indoor heat exchanger 41, and then flows back to the outdoor flow section 1. In this way, the heat exchange system controls the switching component 3 to work, so that the high-temperature and high-pressure gaseous refrigerant flowing into the flow switching section from a refrigerant flow port of the outdoor flow section 1 flows into the first indoor heat exchanger 41 to condense and release heat to heat the gas flowing through the first indoor heat exchanger 41, and the high-pressure liquid refrigerant after heat exchange flows back to the outdoor flow section 1 through another refrigerant flow port.

[0048] It should be noted that there are multiple ways for the heat exchange system to achieve the heating mode. In other embodiments, the heat exchange system can also heat through the first indoor heat exchanger 41 and the second indoor heat exchanger 42 simultaneously. However, this method has a higher heat loss, resulting in higher energy consumption of the heat exchange system. Compared with using two heat exchangers for heating, the heat loss of using one heat exchanger for heating is relatively low. Therefore, in this embodiment, the first indoor heat exchanger 41 is used for heating to reduce the heat loss of the heat exchange system, improve the energy utilization rate, and thus help reduce the power consumption. Further, in order to ensure the heating capacity of the heat exchange system, the power of the first indoor heat exchanger 41 should be greater than the power of the second indoor heat exchanger 42, which is beneficial to improving the heating effect of the heat exchange system and reducing the energy consumption of the heat exchange system.

[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, and then flows through the first indoor heat exchanger 41 to absorb heat before flowing back to the outdoor flow section 1. In this way, the heat exchange system 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 flow port of the outdoor flow section 1 absorbs heat and evaporates 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 another refrigerant flow 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, and a fourth branch section 24. 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 first branch section 21, and a confluence communication port is formed on the first branch section 21. 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 can have multiple heat exchange modes. In this way, 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 or 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, the switching component 3 controls the flow of the refrigerant on the flow switching flow section 2 to enable the heat exchange system to 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. The second control valve 33 is disposed on the third branch section 23. In this way, 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 third branch section 23 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, so that the heat exchange system can 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 thermal 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 a solenoid valve or an electronic expansion valve, etc. The present invention does not limit this.

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

[0054] In order to enable the heat exchange system to form the refrigeration mode or the defrosting mode, in an embodiment of the present invention, please refer to Figure 1 , fully open the first throttling element 31, close the first control valve 32, and fully open the second control valve 33, so that the heat exchange system can be in the refrigeration 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 heat exchanger through the third branch section 23. The low-temperature and low-pressure liquid refrigerant evaporates and absorbs heat in the second heat exchanger and is converted into a low-temperature and low-pressure gaseous refrigerant, 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 a medium-temperature and low-pressure gaseous refrigerant, so as 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 can form the refrigeration mode or the defrosting mode.

[0055] In order to enable the heat exchange system to form the heating mode, in an embodiment of the present invention, please refer to Figure 1 , close the first throttling element 31, fully open the first control valve 32, and close the second control valve 33, so that the heat exchange system can be in the heating mode. In this way, the refrigerant flowing out of a refrigerant flow port of the outdoor flow section 1 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, so as to heat and raise the temperature of the gas flowing through the first indoor heat exchanger 41. The heat-exchanged refrigerant flows into the other refrigerant flow port of the outdoor flow section 1 through the first branch section 21, so that the heat exchange system can 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 arranged 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. Thus, by arranging the compressor 11, the refrigerant can be compressed; by arranging the outdoor heat exchanger 13, the refrigerant can exchange heat with outdoor air; by arranging 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 arranging the refrigerant radiator 15, the circuit board assembly of the heat exchange system can be cooled. At the same time, by arranging 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 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 arranged on the outdoor flow path section 1, if only the second throttling element 14 is set, then in the refrigeration mode of the heat exchange system, the second throttling element 14 needs to throttle the refrigerant. At this time, the refrigerant radiator 15 may condense, which will affect the operation of the circuit board assembly corresponding to the refrigerant radiator 15. Similarly, if only the third throttling element 16 is set, then in the heating mode of the heat exchange system, the refrigerant radiator 15 may also condense. Therefore, the second throttling element 14 and the third throttling element 16 need to be arranged 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 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 flows through the second throttling element 14 and the refrigerant radiator 15 in sequence, 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 on the first indoor heat exchanger 41 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 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 flows through the second throttling element 14, the refrigerant radiator 15 and the third throttling element 16 in sequence, 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 switching flow section 2 and flows back from the first refrigerant communication port to the outdoor flow section 1, the second throttling element 14 is controlled to throttle, and the third throttling element 16 is fully opened, so that the heat exchange system can be in the heating mode. In this mode, the refrigerant flowing into the flow switching flow path from the second refrigerant flow port is respectively condensed and releases heat through the first indoor heat exchanger 41, then flows into the outdoor flow section 1 through the first refrigerant flow port, and then 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 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. Thus, by setting the economizer 5, a part of the refrigerant on the outdoor flow section 1 can flow into the flow switching flow 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, so as to improve the problem of power reduction of the compressor 11 caused by the outdoor environment when the outdoor temperature is too low, thereby meeting 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. Thus, by setting 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. In this embodiment, the heat exchange system includes an air source heat exchange system. Of course, in other embodiments, the heat exchange system may also be an air conditioning system, etc., and the present utility model does not limit this.

[0063] The heat exchange system 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, in combination with the above embodiments, take Figure 1 as an example to illustrate the working modes of the heat exchange system.

[0064] When the heat exchange system 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 is closed, and the second control valve 33 is open. 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 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 is closed, and the second control valve 33 is open. 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. After throttling, the 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 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 is open, and the second control valve 33 is closed. 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, flows into the first indoor heat exchanger 41 for condensation and heat release to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. The refrigerant after heat exchange flows through the third throttling element 16 and then into the second throttling element 14, where it throttles 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. The refrigerant after heat exchange then flows through the four-way valve 12 and into the compressor 11 to be converted into a high-temperature and high-pressure gaseous refrigerant.

[0067] When the heat exchange system 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 is closed, and the second control valve 33 is open. The refrigerant flow path is as follows: The high-temperature and high-pressure gaseous refrigerant flowing out of the compressor 11 first flows through the four-way valve 12 and into the outdoor heat exchanger 13 to convert the high-temperature and high-pressure gaseous refrigerant into a medium-temperature and high-pressure liquid refrigerant. The refrigerant after heat exchange 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. Then it flows into the second indoor heat exchanger 42 and the first indoor heat exchanger 41 in sequence for evaporation and heat absorption. The refrigerant after heat exchange flows through the four-way valve 12 and into the compressor 11 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 it does not limit the patent scope of the present invention accordingly. 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 multiple heat exchange modes include a dehumidification and reheat mode. In the dehumidification and reheat mode, 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.

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 multiple heat exchange modes also include a heating mode. In the heating mode, the refrigerant flows into the circulation switching flow section, releases heat through the first indoor heat exchanger, and then flows back to the outdoor flow section.

4. 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.

5. 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; and a fourth branch section connected to the first branch section and having a converging communication port formed on the first branch section; 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.

6. The heat exchange system according to claim 5, 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 third branch section.

7. The heat exchange system according to claim 6, 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 fully open, so that the heat exchange system can be in a dehumidification and reheating mode.

8. The heat exchange system according to claim 6, 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 fully opened, so that the heat exchange system can be in a cooling mode or a defrosting mode.

9. The heat exchange system according to claim 6, 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 closed, so that the heat exchange system can be in a heating mode.

10. 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.

11. The heat exchange system according to claim 10, 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.

12. The heat exchange system according to claim 10, 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.

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 pump system.

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