Heat exchange system and heat pump equipment

Abstract

The present application discloses a heat exchange system and heat pump device, comprising a throttling unit and a heat exchanger unit. The heat exchanger unit is connected to one side of the throttling outlet of the throttling unit. When the heat exchange system is in a first mode, a portion of the heat exchanger unit can absorb heat from an external medium, while another portion of the heat exchanger unit can absorb cold from the external medium. The heat exchange system and heat pump device of the present application improve energy efficiency and effectively save energy.

Description

Technical Field

[0001] The present application relates to the field of heat pump technology, and in particular to a heat exchange system and a heat pump device. Background Art

[0002] Vapor compression equipment utilizing the reverse Carnot cycle has been widely used in fields such as refrigeration and heat pump heating. The main components of this system include a compressor, condenser, throttling element, and evaporator. The basic operating principle is as follows: a vapor compression system is filled with refrigerant, which is compressed by the compressor to form a high-temperature, high-pressure gas. This gas is then condensed by the condenser into a high-pressure liquid. This liquid is then throttled by the throttling element to form a low-temperature, low-pressure liquid. This liquid absorbs heat in the evaporator, raising its temperature to a low-pressure gas before entering the compressor's intake port. Depending on the application, a heat pump system utilizes the heat from the high-temperature, high-pressure gas in the condenser, while a refrigeration system utilizes the cooling capacity of the low-temperature, low-pressure liquid refrigerant in the evaporator.

[0003] Heat pump systems utilize their dehumidification capabilities to remove moisture from humid air. The operating principle is as follows: humid air first passes through the evaporator, where it is cooled to low-temperature, low-humidity air. It then passes through the condenser, where it is heated to high-temperature, low-humidity air. This entire process involves a wide temperature range, resulting in high condensing temperatures and low system efficiency. This results in high compressor power consumption. Summary of the Invention

[0004] In view of this, the embodiments of the present application hope to provide a heat exchange system and a heat pump device to improve the problem of high energy consumption.

[0005] To achieve the above objectives, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A heat exchange system has a first mode and a second mode, the heat exchange system comprising a throttling unit and a heat exchanger unit;

[0007] The heat exchanger unit is connected to one side of the throttling outlet of the throttling unit;

[0008] The heat exchange system is in a first mode, wherein a portion of the heat exchanger unit can absorb heat from an external medium; and another portion of the heat exchanger unit can absorb cold from the external medium.

[0009] Furthermore, the heat exchange system is in the second mode, and the heat exchanger unit is capable of absorbing heat from an external medium.

[0010] Furthermore, the heat exchanger unit includes a first heat exchanger, a second heat exchanger, and a third heat exchanger for sequentially exchanging heat with the external medium; when the heat exchange system is in a first mode, the first heat exchanger and the second heat exchanger can absorb heat from the external medium; and the third heat exchanger can absorb cold from the external medium.

[0011] Furthermore, the heat exchange system includes a compressor unit and a condenser unit, and the heat exchanger unit includes a switch valve; the first heat exchanger and the third heat exchanger are connected in parallel to form an internal circulation loop; the exhaust end of the compressor unit is connected to the internal circulation loop and the second heat exchanger through the condenser unit and the throttling unit in sequence; the refrigerant outlet of the internal circulation loop is connected to the compressor unit through the switch valve; the refrigerant outlet of the second heat exchanger is connected to the compressor unit; when the heat exchange system is in the first mode, the switch valve is open; when the heat exchange system is in the second mode, the switch valve is open.

[0012] Furthermore, the throttling unit includes a first throttle and a second throttle; the throttling outlet of the first throttle, the throttling outlet of the second throttle, the refrigerant inlet of the second heat exchanger are connected to the refrigerant inlet of the internal circulation loop.

[0013] Furthermore, the heat exchange system is in the second mode, the refrigerant discharged from the compressor unit flows into the condenser unit and the throttling unit in sequence, and the throttled refrigerant flows through the first heat exchanger, the second heat exchanger, and the third heat exchanger respectively before returning to the compressor unit.

[0014] Furthermore, the heat exchange system is in a first mode; the refrigerant after throttling by the throttling unit flows into the second heat exchanger, and returns to the compressor unit after being discharged; the liquid refrigerant in the first heat exchanger can absorb the heat of the external medium and be converted into a gaseous refrigerant and circulate to the third heat exchanger, and the gaseous refrigerant in the third heat exchanger can absorb the cold of the external medium and be converted into a liquid refrigerant, and return to the first heat exchanger to realize internal circulation.

[0015] Furthermore, the condenser unit includes a first condenser and a second condenser; the refrigerant outlet of the first condenser is connected to the first throttle; and the refrigerant outlet of the second condenser is connected to the second throttle.

[0016] Furthermore, the compressor unit includes a first compression cylinder and a second compression cylinder; the exhaust end of the first compression cylinder is connected to the first condenser; and the exhaust end of the second compression cylinder is connected to the second condenser.

[0017] Furthermore, the compressor unit includes a gas-liquid separator; the exhaust end of the compressor unit is connected to the second heat exchanger and the switch valve through the gas-liquid separator.

[0018] A heat pump device comprises the above-mentioned heat exchange system.

[0019] A heat exchange system and a heat pump device in an embodiment of the present application are provided by setting a throttling unit and a heat exchanger unit; the heat exchanger unit is connected to the throttling outlet side of the throttling unit; the heat exchange system is in a first mode, a part of the heat exchanger unit can absorb heat from the external medium, and the other part of the heat exchanger unit can absorb cold from the external medium, thereby increasing the intake temperature, lowering the exhaust temperature, reducing the load on compressing the refrigerant, improving the system energy efficiency, and effectively saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a heat exchange system according to a first embodiment of the present application;

[0021] Figure 2 This is a schematic structural diagram of a heat exchange system according to a second embodiment of the present application;

[0022] Figure 3 This is a schematic structural diagram of a heat exchange system according to a third embodiment of the present application;

[0023] Figure 4 Schematic diagram of the structure of the heat exchange system of the fourth embodiment of the present application, wherein the solid arrows represent the flow direction of the refrigerant when the heat exchange system is in the second mode;

[0024] Figure 5 Schematic diagram of the structure of the heat exchange system of the fourth embodiment of the present application, wherein the heat exchange system is in the first mode, the on-off valve is omitted, the solid arrows represent the flow direction of the refrigerant through the second heat exchanger, and the dotted arrows represent the flow direction of the refrigerant in the internal circulation loop;

[0025] Figure 6 This is a schematic structural diagram of a heat exchange system according to a fifth embodiment of the present application;

[0026] Figure 7 Schematic diagram of the structure of the heat exchange system of the sixth embodiment of the present application, wherein the heat exchange system is in the first mode, the solid arrows represent the flow direction of the refrigerant passing through the second heat exchanger, and the dotted arrows represent the flow direction of the refrigerant in the internal circulation loop;

[0027] Figure 8 Schematic diagram of the structure of the heat exchange system of the sixth embodiment of the present application, wherein the solid arrows represent the flow direction of the refrigerant when the heat exchange system is in the second mode;

[0028] Figure 92 is a schematic structural diagram of a heat exchange system according to a seventh embodiment of the present application, wherein the heat exchange system is in a first mode, solid arrows represent the flow direction of the refrigerant passing through the second heat exchanger, and dashed arrows represent the flow direction of the refrigerant in the internal circulation loop;

[0029] Figure 10 Schematic diagram of the structure of the heat exchange system of the seventh embodiment of the present application, wherein the solid arrows represent the flow direction of the refrigerant when the heat exchange system is in the second mode;

[0030] Figure 11 This is a structural diagram of the heat exchange system of the eighth embodiment of the present application, wherein the solid arrows represent the flow direction of the refrigerant when the heat exchange system is in the second mode. DETAILED DESCRIPTION

[0031] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of this application and should not be regarded as an improper restriction on this application.

[0032] In the description of the embodiments of the present application, the orientations or positional relationships of “up”, “down”, “left”, “right”, “front” and “back” are based on the orientations or positional relationships shown in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] like Figures 1 to 11 As shown, a heat exchange system includes a compressor unit 100, a condenser unit 200, a throttling unit 300 and a heat exchanger unit 400.

[0034] The compressor unit 100 has an air inlet end 100a and an air outlet end 100b; the condenser unit 200 is connected to the air outlet end 100b of the compressor unit 100; the throttling unit 300 is connected to the condenser unit 200; and the heat exchanger unit 400 is connected to the throttling unit 300 and the air inlet end 100a of the compressor unit 100.

[0035] It is understood that in various embodiments of the present application, the condenser unit 200 and the heat exchanger unit 400 can be conventional copper tube fins with refrigerant flowing inside. The refrigerant can be common R12, R22 Freon, R410a, R134a, R407c, alkanes, ammonia, carbon dioxide, etc. The external medium 900 can be air containing water vapor, or other gas mixtures mixed with multiple gases. The refrigerant temperature within the condenser unit 200 and the heat exchanger unit 400 is generally also the surface temperature of the condenser unit 200 and the heat exchanger unit 400; the external medium 900 and the surfaces of the condenser unit 200 and the heat exchanger unit 400 absorb or exchange heat accordingly, achieving a change in the gas between the liquid phase and the gas phase; the refrigerant within the condenser unit 200 and the heat exchanger unit 400 undergoes a phase change of the refrigerant according to the corresponding heat absorption or heat release, thereby achieving heat transfer.

[0036] Specifically, the exhaust end 100b of the compressor unit 100 is connected to the condensation inlet 200a of the condenser unit 200; the high-temperature and high-pressure refrigerant discharged from the exhaust end 100b enters the condenser unit 200, so that the surface of the condenser unit 200 can dissipate heat to the external medium 900, thereby increasing the temperature of the external medium 900; the condensation outlet 200b of the condenser unit 200 is connected to the throttling inlet 300a of the throttling unit 300, and the refrigerant flowing out of the condensation outlet 200b enters the throttling unit 300; the heat exchanger unit 400 The two ends are respectively connected to the throttling unit 200 and the air inlet end 100a of the compressor unit 100. The throttled low-temperature and low-pressure refrigerant flows out from the throttling outlet 300b of the throttling unit 300 and enters the heat exchanger unit 400. That is to say, the heat exchanger unit 400 is connected to one side of the throttling outlet 300b of the throttling unit 300. The surface of the heat exchanger unit 400 exchanges heat with the external medium 900, and the refrigerant flowing out of the heat exchanger unit 400 flows back to the air inlet end 100a of the compressor unit 100 for re-compression, thereby realizing the circulation of the refrigerant.

[0037] During the refrigerant circulation process, the heat exchange system has a first mode and a second mode according to different forms of heat exchange between the heat exchanger unit 400 and the external medium 900.

[0038] In which, the heat exchange system is in the first mode, and a portion of the heat exchanger unit 400 can absorb heat from the external medium 900; that is, this portion acts as an evaporator to absorb heat from the external medium 900, causing the external medium 900 to cool down, and then can condense the water vapor in the external medium 900 to achieve a drying effect.

[0039] Another part of the heat exchanger unit 400 can absorb the cold energy in the external medium 900. It should be noted that the cold energy here is the total energy value of the heat consumed by the equipment in the target area through refrigeration per unit time or a period of time, or the total energy value of the heat extracted from the target area. In other words, absorbing the cold energy in the external medium 900 is equivalent to this part radiating heat to the external medium 900; this part of the heat exchanger unit 400 can play a role similar to a condenser, so that the external medium 900 that has been cooled and dried can be heated up; but it should be noted that this part of the heat exchanger unit 400 is located on the side of the throttling outlet 300b of the throttling unit 300, that is, the refrigerant after throttling flows into this part of the heat exchanger unit 400 and plays the role of a condenser.

[0040] In this technical field, the intake temperature of the intake end 100a of the compressor unit 100 is directly related to the temperature of the inflowing refrigerant, and the exhaust temperature of the exhaust end 100b of the compressor unit 100 is directly related to the temperature of the outflowing refrigerant. When other conditions remain unchanged, the higher the intake temperature of the intake end 100a, the lower the compression power consumption of the compressor unit 100, and the lower the exhaust temperature of the exhaust end 100b, the lower the compression power consumption of the compressor unit 100.

[0041] A part of the heat exchanger unit 400 can absorb the heat in the external medium 900. The heat contained in the internal refrigerant is relatively high, which can increase the intake temperature to a certain extent, thereby reducing the load of the compressor unit 100 on compressing the refrigerant, effectively saving energy; in addition, since the external medium 900 has been heated to a certain extent in another part of the heat exchanger unit 400, when the external medium 900 exchanges heat with the condenser unit 200 again, it can effectively reduce the condensation temperature of the condenser unit 200, which is equivalent to reducing the exhaust temperature of the exhaust end 100b, thereby reducing the load of the compressor unit 100 on compressing the refrigerant.

[0042] Thus, the heat exchange system is in the first mode, which improves the system energy efficiency and effectively saves energy by reducing the exhaust temperature of the exhaust end 100b of the compressor unit 100 and increasing the intake temperature of the intake end 100a of the compressor unit 100.

[0043] A possible embodiment is as follows Figures 1 to 11 As shown, when the heat exchange system is in the second mode, the heat exchanger unit 400 can absorb heat from the external medium 900. In other words, the heat exchanger unit 400 acts as an evaporator, absorbing heat from the external medium 900, cooling the external medium 900 and condensing the water vapor in the external medium 900 to achieve a drying effect. The dried external medium 900 then exchanges heat with the condenser unit 200 to increase its temperature.

[0044] It should be noted that a portion of the heat exchanger unit 400 of the present application can perform different functions in the first mode and the second mode. Specifically, in the first mode, this portion of the heat exchanger unit 400 can function like a condenser, raising the temperature of the external medium 900; whereas in the second mode, this portion of the heat exchanger unit 400 can function like an evaporator, lowering the temperature of the external medium 900 and achieving a drying effect. For example, in the case of a heat exchange system used in a dryer, switching the functions of this portion of the heat exchanger unit 400 can improve the drying effect of the heat exchange system and reduce overall power consumption.

[0045] Specifically, in the middle and late stages of the dryer drying clothes, the heat exchange system is in the first mode; the high-temperature clothes are placed in the drum of the dryer, and the high-temperature dry external medium 900, that is, air, blows through the clothes to form a high-temperature and high-humidity airflow, which reaches the heat exchanger unit 400; a part of the heat exchanger unit 400 acts as an evaporator to absorb heat from the external medium 900, cool it down and dry it, and form a low-temperature dry external medium 900; another part of the heat exchanger unit 400 acts as a condenser, and the low-temperature dry external medium 900 obtains heat after passing through this part, forming a medium-temperature dry external medium 900, and then further flows into the condenser unit 200, and forms a high-temperature dry external medium 900 through heat exchange, and is blown into the drum of the dryer. In the drum, clothes are dried; as mentioned above, during the first mode, the exhaust temperature of the exhaust port 100b of the compressor unit 100 is reduced to improve the system energy efficiency and effectively save energy; and in this process, a part of the heat exchanger unit 400 is used as an evaporator to meet the cooling demand of the high-temperature and high-humidity external medium 900; however, in the early stage of the dryer drying clothes, the overall temperature is still at room temperature. If the heat exchange system is still in the first mode, it only relies on a part of the heat exchanger unit 400 as an evaporator to absorb heat from the external medium 900 at room temperature. Due to the small area of the evaporator, the amount of heat that can be absorbed is small, causing the compressor unit 100 to have to increase its work, resulting in excessive starting load and low efficiency.

[0046] In this regard, in the early stage of the dryer drying the clothes, the heat exchange system is in the second mode; the clothes at room temperature are placed in the dryer drum, and the external medium 900, that is, air, blows through the clothes and reaches the heat exchanger unit 400; the heat exchanger unit 400 as a whole acts as an evaporator to absorb the heat in the external medium 900 at room temperature. Under the same conditions, compared with the first mode, in the second mode, part of the structure of the heat exchanger unit 400 that originally served as a condenser is changed to the function of an evaporator, so that the area of the evaporator is larger and more heat can be absorbed, thereby reducing the work load at the initial startup of the compressor unit 100, and ultimately effectively achieving energy saving and improving the efficiency of the heat exchange system.

[0047] A possible embodiment is as follows Figure 2 、 Figures 4 to 11 As shown, the heat exchanger unit 400 includes a first heat exchanger 410 , a second heat exchanger 420 and a third heat exchanger 430 for sequentially exchanging heat with the external medium 900 .

[0048] The heat exchange system is in the first mode, the first heat exchanger 410 and the second heat exchanger 420 can absorb heat from the external medium; the third heat exchanger 430 can absorb cold from the external medium.

[0049] Specifically, when the heat exchange system is in the first mode, the external medium 900 blows through the clothes and reaches the heat exchanger unit 400. The heat exchanger unit 400 includes a first heat exchanger 410, a second heat exchanger 420 and a third heat exchanger 430 for the external medium 900 to pass through in sequence and exchange heat. The first heat exchanger 410 and the second heat exchanger 420 can act as evaporators to absorb heat from the external medium 900, cool it down and dry it, and form a low-temperature dry external medium 900. At this time, the temperature of the external medium 900 is lower than the temperature of the third heat exchanger 430. The third heat exchanger 430 can act as a condenser to dissipate heat to the external medium 900. After passing through the third heat exchanger 430, the low-temperature dry external medium 900 forms a medium-temperature dry external medium 900, and then further flows into the condenser unit 200. Through heat exchange, a high-temperature dry external medium 900 is formed, which is blown into the drum of the dryer to dry the clothes.

[0050] The heat exchange system is in the second mode. The external medium 900 blows through the clothes and reaches the heat exchanger unit 400. The heat exchanger unit 400 includes a first heat exchanger 410, a second heat exchanger 420, and a third heat exchanger 430 for the external medium 900 to pass through and exchange heat in sequence. The first heat exchanger 410 and the second heat exchanger 420 act as evaporators to absorb heat from the external medium 900, cooling and drying it. At this time, the temperature of the external medium 900 is still higher than that of the third heat exchanger 430. When the external medium 900 continues to pass through the third heat exchanger 430, the temperature of the external medium 900 is still higher than that of the third heat exchanger 430. , the third heat exchanger 430 continues to absorb the heat of the external medium 900 as an evaporator, cooling and drying it to form a low-temperature dry external medium 900; that is, the first heat exchanger 410, the second heat exchanger 420, and the third heat exchanger 430 can all absorb heat from the external medium 900; the low-temperature dry external medium 900 passes through the condenser unit 200, and the condenser unit 200 dissipates heat to the external medium 900, raising the temperature to form a high-temperature dry external medium 900, which is blown into the drum of the dryer to complete the function of drying clothes.

[0051] It should be understood that the first heat exchanger 410, the second heat exchanger 420, and the third heat exchanger 430 are all connected to the throttling outlet 300b of the throttling unit 300. The refrigerant in the first heat exchanger 410, the second heat exchanger 420, and the third heat exchanger 430 is throttled refrigerant. Whether the third heat exchanger 430 functions as a condenser or an evaporator depends on the temperature of the third heat exchanger 430 and the external medium 900.

[0052] That is to say, when the temperature of the external medium 900 after passing through the first heat exchanger 410 and the second heat exchanger 420 in sequence is T0, the temperature of the refrigerant in the third heat exchanger 430 is T1; when the heat exchange system is in the first mode and the dryer is drying the clothes in the middle and late stages, T0<T1, the third heat exchanger 430 dissipates heat to the external medium 900, the temperature of the external medium 900 increases, and the third heat exchanger 430 acts as a condenser; thereby, the exhaust temperature of the exhaust end 100b of the compressor unit 100 can be reduced, and the intake temperature of the intake end 100a of the compressor unit 100 can be increased, thereby improving the system energy efficiency and effectively saving energy.

[0053] In the early stage of the dryer drying clothes, the heat exchange system is in the second mode, T0>T1, the third heat exchanger 430 absorbs heat from the external medium 900, the temperature of the external medium 900 continues to decrease, and the third heat exchanger 430 acts as an evaporator; this makes the area of the heat exchanger unit 400 as an evaporator larger, and can absorb more heat, thereby reducing the work load at the initial startup of the compressor unit 100.

[0054] It can be seen that when the conditions such as the flow rate of the external medium 900, the heat exchange area of the first heat exchanger 410 and the second heat exchanger 420 remain unchanged, the embodiment of the present application can control the opening of the throttling unit 300 so that the refrigerant in the first heat exchanger 410 and the second heat exchanger 420 reaches a preset temperature, thereby making the temperature T0 of the external medium 900 after passing through the first heat exchanger 410 and the second heat exchanger 420 higher or lower than the temperature T1 of the third heat exchanger 430, thereby realizing the function of the third heat exchanger 430 as a condenser or as an evaporator, and ultimately effectively achieving energy saving and improving the efficiency of the heat exchange system.

[0055] In some other embodiments, the heat exchanger unit 400 may have multiple heat exchangers instead of necessarily three; wherein at least one heat exchanger can function as an evaporator, and at least another heat exchanger can function as an evaporator or a condenser in the first mode or the second mode.

[0056] like Figure 3 As shown, the heat exchanger unit 400 includes a fourth heat exchanger 440 and a fifth heat exchanger 450 through which the external medium passes in sequence.

[0057] The heat exchange system is in the first mode; the fourth heat exchanger 440 can absorb heat from the external medium 900 to form a dry and low-temperature external medium 900; the fifth heat exchanger 450 can absorb cold from the dry and low-temperature external medium 900, that is, the temperature of the dry and low-temperature external medium 900 passing through the fourth heat exchanger 440 should be lower than the temperature of the fifth heat exchanger 450, and the fifth heat exchanger 450 dissipates heat to the dry and low-temperature external medium 900 to form a medium-temperature dry external medium 900.

[0058] The heat exchange system is in the second mode, with both the fourth heat exchanger 440 and the fifth heat exchanger 450 absorbing heat from the external medium. The fourth heat exchanger 440 absorbs heat from the external medium 900 to form a dry external medium 900. The temperature of the dry external medium 900 passing through the fourth heat exchanger 440 remains higher than that of the fifth heat exchanger 450. The fifth heat exchanger 450 continues to absorb heat from the dry external medium 900, forming a low-temperature, dry external medium 900.

[0059] In each embodiment of the present application, unless otherwise specified, the temperature of the heat exchanger (including the first heat exchanger 410, the second heat exchanger 420, the third heat exchanger 430, or the fourth heat exchanger 440, the fifth heat exchanger 450) refers to the temperature of the refrigerant in the heat exchanger.

[0060] A possible embodiment is as follows Figures 4 to 11 As shown, the heat exchanger unit 400 includes a switching valve 460. The switching valve 460 may be a solenoid valve or a stop valve.

[0061] The first heat exchanger 410 and the third heat exchanger 430 are connected in parallel to form an internal circulation loop. Parallel connection here means that the refrigerant inlet 410a of the first heat exchanger 410 is connected to the refrigerant inlet 430a of the third heat exchanger 430, and the refrigerant outlet 410b of the first heat exchanger 410 is connected to the refrigerant outlet 430b of the third heat exchanger 430. In the following embodiments, unless otherwise specified, the refrigerant inlet of the internal circulation loop refers to the refrigerant inlet 410a and the refrigerant inlet 430a; and the refrigerant outlet of the internal circulation loop refers to the refrigerant outlet 410b and the refrigerant outlet 430b.

[0062] In the specific arrangement, along the flow direction of the external medium 900, the first heat exchanger 410 should be in front, the third heat exchanger 430 should be in the back, and the second heat exchanger 420 should be between the first heat exchanger 410 and the third heat exchanger 430, so that the external medium 900 can pass through the first heat exchanger 410, the second heat exchanger 420 and the third heat exchanger 430 in sequence.

[0063] The exhaust port 100b of the compressor unit 100 is connected to the internal circulation loop and the second heat exchanger 420 in sequence through the condenser unit 200 and the throttling unit 300. The refrigerant outlets 410b and 430b of the internal circulation loop are connected to the compressor unit 100 via the on-off valve 460. The refrigerant outlet 420b of the second heat exchanger 420 is connected to the compressor unit 100.

[0064] That is to say, the exhaust end 100b of the compressor unit 100 is connected to the condensation inlet 200a of the condenser unit 200, and the condensation outlet 200b of the condenser unit 200 is connected to one side of the throttling inlet 300a of the throttling unit 300; the throttling outlet 300b of the throttling unit 300 is respectively connected to the refrigerant inlet 410a, 430a of the internal circulation loop and the refrigerant inlet 420a of the second heat exchanger 420; the refrigerant outlet 410b, 430b of the internal circulation loop is connected to the air intake end 100a of the compressor unit 100 through the switch valve 460; the refrigerant outlet 420b of the second heat exchanger 420 is directly connected to the air intake end 100a of the compressor unit 100.

[0065] refer to Figure 4 、 Figure 6 、 Figure 8 、 Figure 10 as well as Figure 11 As shown, the heat exchange system is in the second mode, with the switch valve 460 open. The refrigerant discharged from the compressor unit 100 flows sequentially into the condenser unit 200 and the throttling unit 300. After being throttled by the throttling unit 300, the refrigerant flows through the first heat exchanger 410, the second heat exchanger 420, and the third heat exchanger 430, and then flows back to the compressor unit 100.

[0066] Specifically, the high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 passes through the condenser unit 200 and then enters the throttling unit 300, and is discharged from the throttling outlet 300b of the throttling unit 300 as the low-temperature and low-pressure refrigerant formed by throttling. A part of the low-temperature and low-pressure refrigerant enters from the refrigerant inlet 410a, 430a of the internal circulation loop, and flows out from the refrigerant outlet 410b, 430b of the internal circulation loop, and flows back to the air inlet end 100a of the compressor unit 100 through the switch valve 460; another part of the low-temperature and low-pressure refrigerant enters from the refrigerant inlet 420a of the second heat exchanger 420, and flows back to the air inlet end 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420.

[0067] In the early stage of the dryer drying clothes, the heat exchange system is in the second mode, and the external medium 900 at room temperature reaches the heat exchanger unit 400; it passes through the first heat exchanger 410, the second heat exchanger 420 and the third heat exchanger 430 in sequence to complete cooling and dehumidification, forming a low-temperature dry external medium 900; then it passes through the condenser unit 200 to complete heating, forming a high-temperature dry external medium 900, which is blown into the drum to dry the clothes. Among them, by controlling the throttling opening of the throttling unit 300, the temperatures of the first heat exchanger 410, the second heat exchanger 420 and the third heat exchanger 430 are controlled; the first heat exchanger 410 absorbs the heat of the external medium 900 and cools and dries the external medium 900 for the first time; the second heat exchanger 420 continues to absorb the heat of the external medium 900 after the first cooling and drying, and cools and dries it for the second time; the third heat exchanger 430 continues to absorb the heat of the external medium 900 after the first cooling and drying, and cools and dries it for the second time; under the same conditions, the third heat exchanger 430 becomes the function of an evaporator, so that the area of the heat exchanger unit 400 as an evaporator is larger, and it can absorb more heat, thereby reducing the work load of the compressor unit 100 at the initial startup, and ultimately effectively achieving energy saving and improving the efficiency of the heat exchange system.

[0068] refer to Figure 5 、 Figure 7 as well as Figure 9 As shown, the heat exchange system is in the first mode, and the switch valve 460 is open. The internal circulation loop is equivalent to a semi-closed loop with only a refrigerant inlet.

[0069] The refrigerant discharged from the compressor unit 100 flows into the condenser unit 200 and the throttling unit 300 in sequence; the refrigerant throttled by the throttling unit 300 flows into the second heat exchanger 420, and after being discharged, returns to the compressor unit 100 to form a refrigerant cycle.

[0070] Specifically, the high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 passes through the condenser unit 200 and then enters the throttling unit 300, and is discharged from the throttling outlet 300b of the throttling unit 300 as the low-temperature and low-pressure refrigerant formed by throttling. The low-temperature and low-pressure refrigerant enters from the refrigerant inlet 420a of the second heat exchanger 420, and the second heat exchanger 420 exchanges heat with the external medium 900, absorbs the heat of the external medium 900 to cool it down, and the refrigerant in the second heat exchanger 420 absorbs the heat and flows back to the air inlet 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420, forming a refrigerant cycle.

[0071] The liquid refrigerant in the first heat exchanger 410 can absorb the heat of the external medium 900 and be converted into gaseous refrigerant and circulate to the third heat exchanger 430. The gaseous refrigerant in the third heat exchanger 430 can absorb the cold of the external medium 900 and be converted into liquid refrigerant, and return to the first heat exchanger 410 to realize internal circulation.

[0072] Those skilled in the art will appreciate that the refrigerant after throttling by the throttling unit 300 is typically in a gas-liquid mixture. In a specific arrangement, along the flow direction of the external medium 900, the first heat exchanger 410 should be placed in front and the third heat exchanger 430 in the back. The first heat exchanger 410 can be positioned higher than the third heat exchanger 430, so that the refrigerant in the first heat exchanger 410 is primarily liquid low-temperature refrigerant, while the refrigerant in the third heat exchanger 430 is primarily gaseous low-temperature refrigerant.

[0073] During the middle and later stages of the dryer's drying process, the heat exchange system is in the first mode. High-temperature external medium 900 at temperature T2 reaches the heat exchanger unit 400 and sequentially passes through the first heat exchanger 410 at temperature T3, the second heat exchanger 420 at temperature T4, and the third heat exchanger 430 at temperature T5.

[0074] Among them, the external medium 900 passes through the first heat exchanger 410, T3<T2, the first heat exchanger 410 absorbs the heat of the external medium 900, that is, the liquid refrigerant in the first heat exchanger 410 can absorb the heat of the external medium 900 and be converted into a gaseous refrigerant, and the gaseous refrigerant circulates to the third heat exchanger 430 under the action of gravity, temperature, pressure, etc., thereby, the external medium 900 is cooled and dried for the first time, and its temperature changes to T6.

[0075] The external medium 900 continues to flow until it passes through the second heat exchanger 420. The low-temperature refrigerant after throttling by the throttling unit 300 flows in the second heat exchanger 420. By controlling the throttling opening, T4<T6, and the second heat exchanger 420 continues to absorb the heat of the external medium 900 after the first cooling and drying, so that it is cooled and dried for the second time, and its temperature changes to T7.

[0076] The external medium 900 continues to flow through the third heat exchanger 430. By controlling the flow rate of the external medium 900, the throttling opening of the throttling unit 300, and the heat exchange area of the second heat exchanger 420, etc., T7 is controlled to be greater than T5. The gaseous refrigerant in the third heat exchanger 430 can absorb the cooling capacity of the external medium 900. In other words, the third heat exchanger 430 dissipates heat to the external medium 900. The gaseous refrigerant loses heat and converts into liquid refrigerant. Under the action of gravity and pressure, it flows back into the first heat exchanger 410, completing the internal circulation of the refrigerant in the first heat exchanger 410 and the third heat exchanger 430. As a result, the third heat exchanger 430 dissipates heat to the external medium 900 that has undergone the second cooling and drying, causing the external medium 900 to achieve the first temperature increase, with its temperature change being T8.

[0077] The external medium 900 continues to flow and passes through the condenser unit 200. The condenser unit 200 radiates heat to the external medium 900, which continues to increase the temperature to form a high-temperature dry external medium 900, which is blown into the drum of the dryer to complete the function of drying clothes.

[0078] In the first mode, the transfer of refrigerant in the internal circulation loop is achieved through phase changes in which the refrigerant absorbs heat and converts to a gaseous state, dissipates heat and converts to a liquid state, as well as through the effects of gravity, pressure, etc. Therefore, the internal circulation loop can not only cool and dry the external medium 900 for the first time, but also heat the external medium 900 for the first time. Under the same conditions, it can also increase the intake temperature of the air at the intake end 100a of the compressor unit 100 and reduce the exhaust temperature at the exhaust end 100b of the compressor unit 100. In addition, in the first mode, the internal circulation loop does not require the compressor unit 100 to be driven, which can effectively reduce the load of the compressor unit 100, achieve energy saving, and improve system energy efficiency.

[0079] In the early stage of the dryer drying clothes, the heat exchange system is in the second mode, and the internal circulation loop is filled with refrigerant flowing to the compressor unit 100; in the middle and late stages of the dryer drying clothes, the switch valve 460 is disconnected, and the heat exchange system switches to the first mode. A certain amount of refrigerant exists in the internal circulation loop and has not yet passed through the switch valve 460 to flow back to the exhaust end 100a of the compressor unit 100.

[0080] In actual applications, the amount of refrigerant in the internal circulation loop is related to the pressure and the length of the pipe in the internal circulation loop. Since the switch valve 460 is disconnected, the internal circulation loop has no refrigerant outlet, which is equivalent to a semi-closed loop. On the basis of maintaining the internal and external pressure balance of the refrigerant inlets 410a and 430a of the switch valve 460, this part of the refrigerant will circulate in the internal circulation loop and will not flow out of the refrigerant inlets 410a and 430a of the internal circulation loop in the opposite direction. The refrigerant inlets 410a and 430a of the internal circulation loop are usually designed to be small so that the refrigerant pressure in the internal circulation loop is equal to that on the side of the throttling outlet 300b of the throttling unit 300. However, since there is no refrigerant exchange between the internal circulation loop and the throttling outlet 300b of the throttling unit 300, or the exchange is very slow, a temperature difference is allowed between the internal circulation loop and the side of the throttling outlet 300b of the throttling unit 300.

[0081] It should be understood that the amount of refrigerant that the internal circulation loop can accommodate is generally limited. However, in certain extreme cases, for example, if too little refrigerant remains in the internal circulation loop and the temperature of the external medium 900 is too high, this can cause a pressure imbalance at the refrigerant inlets 410a and 430a of the internal circulation loop. A small amount of refrigerant may flow into the internal circulation loop from the throttling outlet 300b of the throttling unit 300, or flow out of the internal circulation loop. Once the pressure is rebalanced, the refrigerant no longer flows into or out of the refrigerant inlets 410a and 430a of the internal circulation loop, and the refrigerant in the internal circulation loop achieves internal circulation.

[0082] A possible embodiment is as follows Figures 6 to 11 As shown, the throttle unit 300 includes a first throttle 330 and a second throttle 340 .

[0083] The exhaust port 100 b of the compressor unit 100 is connected to the throttling inlet 330 a of the first throttle 330 and the throttling inlet 340 a of the second throttle 340 through the condenser unit 200 .

[0084] The throttle outlet 330b of the first throttle 330, the throttle outlet 340b of the second throttle 340, and the refrigerant inlet 420a of the second heat exchanger 420 are in communication with the refrigerant inlets 410a and 430a of the internal circulation circuit.

[0085] That is, the throttle outlet 330b of the first throttle 330 is connected to the refrigerant inlets 410a and 430a of the internal circulation circuit, and the throttle outlet 340b of the second throttle 340 is connected to the refrigerant inlet 420a of the second heat exchanger 420. The throttle outlet 330b of the first throttle 330 and the throttle outlet 340b of the second throttle 340 are connected to each other.

[0086] refer to Figure 6 、 Figure 8 、 Figure 10 and Figure 11 As shown, the heat exchange system is in the second mode; the high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 flows into the condenser unit 200, and a portion of the refrigerant after heat exchange flows into the first throttle 330 from the condensation outlet 200b of the condenser unit 200. After throttling, this portion of the refrigerant flows into the refrigerant inlets 410a and 430a of the inner circulation loop from the throttle outlet 330b of the first throttle 330. The refrigerant passes through the first heat exchanger 410 and the third heat exchanger 430 respectively, and then flows out from the refrigerant outlets 410b and 430b of the inner circulation loop, and finally flows back to the air inlet 100a of the compressor unit 100 through the switch valve 460;

[0087] Another part of the refrigerant that has undergone heat exchange in the condenser unit 200 flows into the second throttle 340 from the condensation outlet 200b of the condenser unit 200. After throttling, this part of the refrigerant flows into the refrigerant inlet 420a of the second heat exchanger 420 from the throttling outlet 340b of the second throttle 340. After heat exchange, this part of the refrigerant flows back to the air intake end 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420.

[0088] refer to Figure 7 and Figure 9 As shown, the heat exchange system is in the first mode; the high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 flows into the condenser unit 200, and a part of the refrigerant after heat exchange flows into the first throttle 330 from the condensation outlet 200b of the condenser unit 200, and the other part flows into the second throttle 340 from the condensation outlet 200b of the condenser unit 200; the throttled refrigerant flowing out of the throttle outlet 330b of the first throttle 330 and the throttled refrigerant flowing out of the throttle outlet 340b of the second throttle 340 are mixed and flow into the refrigerant inlet 420a of the second heat exchanger 420. After heat exchange, the refrigerant flows back to the air inlet 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420.

[0089] A possible embodiment is as follows Figures 7 to 11 As shown, the condenser unit 200 includes a first condenser 210 and a second condenser 220 ; the refrigerant outlet 210 b of the first condenser 210 is connected to the first throttle 330 ; the refrigerant outlet 220 b of the second condenser 220 is connected to the second throttle 340 .

[0090] The exhaust end 100b of the compressor unit 100 is respectively connected to the refrigerant inlet 210a of the first condenser 210 and the refrigerant inlet 220a of the second condenser 220. The refrigerant outlet 210b of the first condenser 210 is connected to the throttling inlet 330a of the first throttle 330; the refrigerant outlet 220b of the second condenser 220 is connected to the throttling inlet 340a of the second throttle 340.

[0091] refer to Figure 8 、 Figure 10 and Figure 11 As shown, the heat exchange system is in the second mode.

[0092] The high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 flows into the refrigerant inlet 210a of the first condenser 210 and the refrigerant inlet 220a of the second condenser 220 respectively. The refrigerant flowing out of the refrigerant outlet 210b of the first condenser 210 enters the first throttle 330. After throttling, this part of the refrigerant flows into the refrigerant inlets 410a and 430a of the inner circulation loop from the throttle outlet 330b of the first throttle 330. The refrigerant passes through the first heat exchanger 410 and the third heat exchanger 430 respectively, and then flows out from the refrigerant outlets 410b and 430b of the inner circulation loop, and finally flows back to the intake end 100a of the compressor unit 100 through the switch valve 460.

[0093] The refrigerant flowing out of the refrigerant outlet 220b of the second condenser 220 enters the second throttle 340. After throttling, this part of the refrigerant flows out from the throttling outlet 340b of the second throttle 340 and enters the refrigerant inlet 420a of the second heat exchanger 420. After heat exchange, this part of the refrigerant flows back to the air intake end 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420.

[0094] The external medium 900 passes through the first heat exchanger 410, the second heat exchanger 420 and the third heat exchanger 430 in sequence to complete cooling and dehumidification, forming a low-temperature dry external medium 900; the low-temperature dry external medium 900 then passes through the first condenser 210 to complete the first heating, and then passes through the second condenser 220 to complete the second heating. Through the form of step-by-step heating, the external medium 900 can quickly reach the preset temperature after drying, so that it can be blown into the drum to dry the clothes.

[0095] refer to Figure 7 and Figure 9 As shown, the heat exchange system is in the first mode.

[0096] The high-temperature and high-pressure refrigerant discharged from the exhaust end 100b of the compressor unit 100 flows into the refrigerant inlet 210a of the first condenser 210 and the refrigerant inlet 220a of the second condenser 220 respectively. The refrigerant flowing out of the refrigerant outlet 210b of the first condenser 210 enters the first throttle 330, and after throttling, this part of the refrigerant flows into the refrigerant inlet 420a of the second heat exchanger 420 from the throttling outlet 330b of the first throttle 330; the refrigerant flowing out of the refrigerant outlet 220b of the second condenser 220 enters the second throttle 340, and after throttling, this part of the refrigerant flows into the refrigerant inlet 420a of the second heat exchanger 420 from the throttling outlet 340b of the second throttle 340; after heat exchange, this part of the refrigerant flows back to the air inlet 100a of the compressor unit 100 from the refrigerant outlet 420b of the second heat exchanger 420. The refrigerant in the internal circulation loop realizes internal circulation through the refrigerant phase change and the effects of gravity, pressure, etc., which will not be described in detail here.

[0097] The external medium 900 passes through the first heat exchanger 410 and the second heat exchanger 420 in sequence to complete cooling and dehumidification, forming a low-temperature dry external medium 900; the low-temperature dry external medium 900 then passes through the third heat exchanger 430 to complete the first heating, forming a medium-temperature dry external medium 900; the medium-temperature dry external medium 900 continues to pass through the first condenser 210 to complete the second heating, and then passes through the second condenser 220 to complete the third heating. Through the form of step-by-step heating, the external medium 900 can quickly reach the preset temperature after drying, so that it can be blown into the drum to dry the clothes.

[0098] In one possible embodiment, Figures 9 to 11 As shown, the compressor unit 100 includes a first compression cylinder 110 and a second compression cylinder 120 ; the exhaust end 110 b of the first compression cylinder 110 is connected to the first condenser 210 ; the exhaust end 120 b of the second compression cylinder 120 is connected to the second condenser 220 .

[0099] The exhaust end 110b of the first compression cylinder 110 is connected to the refrigerant inlet 210a of the first condenser 210; the refrigerant outlet 210b of the first condenser 210 is connected to the throttling inlet 330a of the first throttle 330; the exhaust end 120b of the second compression cylinder 120 is connected to the refrigerant inlet 220a of the second condenser 220, and the refrigerant outlet 220b of the second condenser 220 is connected to the throttling inlet 340a of the second throttle 340.

[0100] It can be understood that the compressor unit 100 can be a compressor with multiple exhaust pressures, in which case the first compression cylinder 110 and the second compression cylinder 120 are two different compression cylinders of a compressor; of course, the compressor unit 100 can also be composed of several single-exhaust pressure compressors connected in parallel, in which case the first compression cylinder 110 is one of the compressors and the second compression cylinder 120 is another compressor.

[0101] The air inlet end 110a of the first compression cylinder 110 and the air inlet end 120a of the second compression cylinder 120 are connected to each other and then connected to the refrigerant outlets 410b and 430b of the internal circulation loop through the switch valve 460; the refrigerant outlet 420b of the second heat exchanger 420 is connected to the air inlet end 110a of the first compression cylinder 110 and the air inlet end 120a of the second compression cylinder 120; the exhaust end 110b of the first compression cylinder 110 is connected to the refrigerant inlet 210a of the first condenser 210; the exhaust end 120b of the second compression cylinder 120 is connected to the refrigerant inlet 220a of the second condenser 220.

[0102] The refrigerant in the internal circulation loop may be sourced from the first compression cylinder 110 , the second compression cylinder 120 , or a mixture of the first compression cylinder 110 and the second compression cylinder 120 .

[0103] refer to Figure 9 As shown in the structure of FIG, in the first mode of the heat exchange system, the refrigerant in the internal circulation loop originates from the second compression cylinder 120. The high-temperature, high-pressure refrigerant discharged from the exhaust port 120b of the second compression cylinder 120 flows into the refrigerant inlet 220a of the second condenser 220, flows out from the refrigerant outlet 220b of the second condenser 220 and enters the second throttle 340. After throttling, the refrigerant flows from the throttle outlet 340b of the second throttle 340 into the refrigerant inlets 410a and 430a of the internal circulation loop.

[0104] refer to Figure 10 As shown, in the first mode of the heat exchange system, the refrigerant in the internal circulation loop originates from the first compression cylinder 110. The high-temperature, high-pressure refrigerant discharged from the exhaust port 110b of the first compression cylinder 110 flows into the refrigerant inlet 210a of the first condenser 210, flows out from the refrigerant outlet 210b of the first condenser 210 and enters the first throttle 330. After throttling, the refrigerant flows from the throttle outlet 330b of the first throttle 330 into the refrigerant inlets 410a and 430a of the internal circulation loop.

[0105] refer to Figure 11As shown, in the first mode of the heat exchange system, the refrigerant in the internal circulation loop comes from the first compression cylinder 110 and the second compression cylinder 120. The high-temperature and high-pressure refrigerant discharged from the exhaust end 110b of the first compression cylinder 110 flows into the refrigerant inlet 210a of the first condenser 210, flows out from the refrigerant outlet 210b of the first condenser 210 and enters the first throttle 330; the high-temperature and high-pressure refrigerant discharged from the exhaust end 120b of the second compression cylinder 120 flows into the refrigerant inlet 220a of the second condenser 220, flows out from the refrigerant outlet 220b of the second condenser 220 and enters the second throttle 340.

[0106] The refrigerant flowing out of the throttle outlet 330 b of the first throttle 330 is mixed with the refrigerant flowing out of the throttle outlet 340 b of the second throttle 340 and then flows into the refrigerant inlets 410 a and 430 a of the internal circulation circuit.

[0107] A possible embodiment is as follows Figure 11 As shown, the compressor unit 100 includes a gas-liquid separator 130. The exhaust end 100b of the compressor unit 100 is connected to the second heat exchanger 420 and the switch valve 460 through the gas-liquid separator 130, and further connected to the refrigerant outlets 410b and 430b of the internal circulation loop.

[0108] Specifically, the air inlet end 110a of the first compression cylinder 110 and the air inlet end 120a of the second compression cylinder 120 are connected to the exhaust port 130b of the gas-liquid separator 130, and the air inlet 130a of the gas-liquid separator 130 is respectively connected to the switch valve 460 and the refrigerant outlet 420b of the second heat exchanger 420; the gas-liquid separator 130 prevents liquid refrigerant from entering the first compression cylinder 110 and the second compression cylinder 120.

[0109] The present application further provides a heat pump device, including the above-mentioned heat exchange system. The heat pump device can be a dryer, a dehumidifier, a food and industrial drying device. Taking the dryer as an example, those skilled in the art know that the heat pump device should also have a fan that drives the external medium 900 to flow along a preset pipeline and a drum that holds clothes. After the high-temperature dry external medium 900 flows through the drum, it becomes a high-temperature and high-humidity external medium 900. It then passes through the heat exchange system, cools down and dehumidifies it to form a low-temperature dry external medium 900, and then heats up to form a high-temperature dry external medium 900 and passes through the drum again to achieve the function of drying clothes.

[0110] The various embodiments / implementations provided in this application can be combined with each other without causing any contradiction.

[0111] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A heat exchange system, characterized in that: Having a first mode and a second mode, the heat exchange system includes a throttling unit (300) and a heat exchanger unit (400); The heat exchanger unit (400) is connected to one side of the throttling outlet (300b) of the throttling unit (300); The heat exchange system is in a first mode, a portion of the heat exchanger unit (400) is capable of absorbing heat from an external medium; another portion of the heat exchanger unit (400) is capable of absorbing cold from an external medium; The heat exchanger unit (400) comprises a first heat exchanger (410), a second heat exchanger (420), and a third heat exchanger (430) for sequentially exchanging heat with an external medium; The heat exchange system is in a first mode, and the first heat exchanger (410) and the second heat exchanger (420) are capable of absorbing heat from an external medium; The third heat exchanger (430) is capable of absorbing cold energy from the external medium; The heat exchange system comprises a compressor unit (100) and a condenser unit (200), and the heat exchange unit (400) comprises an on-off valve (460); The first heat exchanger (410) and the third heat exchanger (430) are connected in parallel to form an internal circulation loop; The exhaust end (100b) of the compressor unit (100) is connected to the internal circulation loop and the second heat exchanger (420) in sequence through the condenser unit (200) and the throttling unit (300); The refrigerant outlet of the internal circulation loop is connected to the compressor unit (100) via the switch valve (460); The refrigerant outlet of the second heat exchanger (420) is connected to the compressor unit (100); The heat exchange system is in a first mode, and the switch valve (460) is disconnected; The heat exchange system is in the second mode, and the switch valve (460) is open.

2. The heat exchange system according to claim 1, characterized in that: The heat exchange system is in the second mode, and the heat exchanger unit (400) is capable of absorbing heat from the external medium.

3. The heat exchange system according to claim 1, characterized in that: The throttling unit (300) includes a first throttle (330) and a second throttle (340); The throttling outlet (330b) of the first throttle (330), the throttling outlet (340b) of the second throttle (340), and the refrigerant inlet (420a) of the second heat exchanger (420) are connected to the refrigerant inlet of the internal circulation loop.

4. The heat exchange system according to claim 1 or 3, characterized in that: The heat exchange system is in the second mode, and the refrigerant discharged from the compressor unit (100) flows into the condenser unit (200) and the throttling unit (300) in sequence. The throttled refrigerant flows through the first heat exchanger (410), the second heat exchanger (420), and the third heat exchanger (430) respectively, and then returns to the compressor unit (100).

5. The heat exchange system according to claim 1 or 3, characterized in that: The heat exchange system is in a first mode; The refrigerant throttled by the throttling unit (300) flows into the second heat exchanger (420) and returns to the compressor unit (100) after being discharged; The liquid refrigerant in the first heat exchanger (410) can absorb the heat of the external medium and be converted into a gaseous refrigerant, which circulates to the third heat exchanger (430). The gaseous refrigerant in the third heat exchanger (430) can absorb the cold of the external medium and be converted into a liquid refrigerant, which returns to the first heat exchanger (410) to realize internal circulation.

6. The heat exchange system according to claim 3, characterized in that: The condenser unit (200) includes a first condenser (210) and a second condenser (220); The refrigerant outlet (210b) of the first condenser (210) is connected to the first throttle (330); The refrigerant outlet (220b) of the second condenser (220) is connected to the second throttle (340).

7. The heat exchange system according to claim 6, characterized in that: The compressor unit (100) comprises a first compression cylinder (110) and a second compression cylinder (120); The exhaust end (110b) of the first compression cylinder (110) is connected to the first condenser (210); The exhaust end (120b) of the second compression cylinder (120) is connected to the second condenser (220).

8. The heat exchange system according to claim 1 or 3, characterized in that: The compressor unit (100) includes a gas-liquid separator (130); The exhaust end (100b) of the compressor unit (100) is connected to the second heat exchanger (420) and the switch valve (460) via the gas-liquid separator (130).

9. A heat pump device, characterized in that: The heat exchange system comprises the heat exchange system according to any one of claims 1 to 8.

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