Refrigerant system

Abstract

The refrigerant system comprises a compressor, a first heat exchanger, a second heat exchanger and a control device, the first heat exchanger and the second heat exchanger communicate with the compressor, the compressor is provided with an exhaust port, the first heat exchanger comprises a first heat exchange part and a second heat exchange part, and the first heat exchange part and the second heat exchange part are provided with a refrigerant flow path and a water path which exchange heat with each other; the control device can control the refrigerant system to be switched between a first mode and a second mode, in the first mode, a refrigerant loop is formed among the compressor, the first heat exchange part and the second heat exchanger, and a refrigerant loop is formed among the compressor, the second heat exchange part and the second heat exchanger; and in the second mode, a refrigerant loop is formed among the compressor, the second heat exchanger and the first heat exchange part, and a refrigerant loop is formed among the compressor, the second heat exchange part and the first heat exchange part. According to the technical scheme, the refrigerant system can be defrosted under the condition that the compressor is not shut down.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a refrigerant system. Background Art

[0002] When the refrigerant system heats under low-temperature conditions, the outdoor heat exchanger is prone to icing and frosting. After the outdoor heat exchanger frosts, the heat exchange efficiency will drop sharply, seriously affecting the heat exchange effect. Therefore, when the refrigerant system operates for a period of time in a low-temperature environment or when the outdoor heat exchanger is severely frosted, it generally enters a defrosting mode to remove the frost on the outdoor heat exchanger.

[0003] The defrosting method of the existing refrigerant system is to switch the refrigerant system from the heating mode to the cooling mode for defrosting, that is, the compressor stops and the refrigerant circuit runs in reverse, resulting in discontinuous heating and thus affecting the use comfort. Summary of the Invention

[0004] The main object of the present invention is to provide a refrigerant system, aiming to enable the refrigerant system to defrost without the compressor stopping, thereby maintaining continuous heating and improving the use comfort.

[0005] To achieve the above object, the refrigerant system proposed by the present invention includes:

[0006] A compressor having an exhaust port;

[0007] A first heat exchanger and a second heat exchanger communicated with the compressor, the first heat exchanger includes a first heat exchange part and a second heat exchange part, and the first heat exchange part and the second heat exchange part are provided with refrigerant flow paths and water paths for heat exchange; and

[0008] A control device that can control the refrigerant system to switch between a first mode and a second mode. In the first mode, a refrigerant circuit is formed between the compressor and the first heat exchange part and the second heat exchanger, and a refrigerant circuit is formed between the compressor and the second heat exchange part and the second heat exchanger; in the second mode, a refrigerant circuit is formed between the compressor and the second heat exchanger and the first heat exchange part, and a refrigerant circuit is formed between the compressor and the second heat exchange part and the first heat exchange part.

[0009] Optionally, the compressor further has a suction port, the control device includes a four-way reversing valve, the first end of the second heat exchange part is communicated with the exhaust port, the first interface of the four-way reversing valve is communicated with the first end of the first heat exchange part, the second interface of the four-way reversing valve is communicated with the second end of the second heat exchanger, the third interface of the four-way reversing valve is communicated with the exhaust port, the fourth interface of the four-way reversing valve is communicated with the suction port, and the first end of the second heat exchanger is communicated with the second end of the first heat exchange part and the second end of the second heat exchange part.

[0010] Optionally, the refrigerant system further includes a first throttling device. The first end of the first throttling device is communicated with the second end of the first heat exchange part and the second end of the second heat exchange part, and the second end of the first throttling device is communicated with the first end of the second heat exchanger.

[0011] Optionally, the exhaust port includes a first exhaust port and a second exhaust port. The first exhaust port is communicated with the third interface of the four-way reversing valve, and the second exhaust port is communicated with the first end of the second heat exchange part.

[0012] Optionally, the refrigerant system further includes a second throttling device. The first end of the second throttling device is communicated with the second end of the one with a larger refrigerant pressure in the first mode among the first heat exchange part and the second heat exchange part, and the second end of the second throttling device is communicated with the first end of the first throttling device.

[0013] Optionally, the refrigerant pressure of the first exhaust port is higher than that of the second exhaust port, and the second end of the second heat exchange part is communicated with the first end of the first throttling device.

[0014] Optionally, the refrigerant pressure of the first exhaust port is lower than that of the second exhaust port. The refrigerant system further includes a fourth throttling device. The second end of the first heat exchange part is communicated with the first end of the first throttling device through the fourth throttling device.

[0015] Optionally, the exhaust port is configured as one. The refrigerant system further includes a shunt pipeline which has two shunt outlets communicated with each other. The intake port of the shunt pipeline is communicated with the exhaust port. One shunt outlet is communicated with the third interface of the four-way reversing valve, and the other shunt outlet is communicated with the first end of the second heat exchange part.

[0016] Optionally, the refrigerant system further includes a second throttling device. The first end of the second throttling device is communicated with the second end of the first heat exchange part, and the second end of the second throttling device is communicated with the first end of the first throttling device.

[0017] Optionally, the refrigerant system further includes an economizer, a gas supply pipeline and a third throttling device. The economizer is internally provided with a third refrigerant flow path and a fourth refrigerant flow path for heat exchange. The first end of the third refrigerant flow path is communicated with the second end of the first heat exchange part and the second end of the second heat exchange part. The first end of the second heat exchanger is communicated with the second end of the third refrigerant flow path and the first end of the fourth refrigerant flow path. The second end of the fourth refrigerant flow path is communicated with the gas supply port of the compressor through the gas supply pipeline.

[0018] Optionally, the first end of the second throttling device communicates with the second end of the first heat exchange portion, and the second end of the second throttling device communicates with the first end of the third refrigerant flow path.

[0019] Optionally, the first heat exchange portion and the second heat exchange portion are arranged adjacent to each other.

[0020] Optionally, the first heat exchange portion and the second heat exchange portion are integrated into the same first heat exchanger.

[0021] Optionally, the first heat exchanger is configured as a plate heat exchanger and is provided with a refrigerant flow path and a water flow path for heat exchange. The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path. The water flow path includes a first water flow path corresponding to the first refrigerant flow path and a second water flow path corresponding to the second refrigerant flow path. The water flow path is provided with a water inlet, a first water outlet corresponding to the first water flow path, and a second water outlet corresponding to the second water flow path.

[0022] Optionally, the water inlet communicates with both the first water flow path and the second water flow path, and the pressures of the refrigerants flowing through the first refrigerant flow path and the second refrigerant flow path are configured to be different, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

[0023] Optionally, the water inlet communicates with the first water flow path, and the first water flow path and the second water flow path are connected in series, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

[0024] Optionally, a flow valve is provided on the first water outlet and / or the second water outlet to adjust the water outlet flow rates of the first water outlet and the second water outlet.

[0025] In the technical solution of the present invention, through the control device, in the second mode, the refrigerant system can defrost the second heat exchanger without stopping the compressor and continuously supplying heat from the first heat exchanger. This not only provides continuous and stable heating to improve the use comfort, but also reduces the risk of failures caused by frequent start and stop of main electrical components such as the compressor, thereby prolonging the service life of the compressor and the refrigerant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0027] Figure 1Schematic diagram of the refrigerant circuit of the first embodiment of the refrigerant system of the present invention in the first mode;

[0028] Figure 2 For Figure 1 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0029] Figure 3 Schematic diagram of the refrigerant circuit of the second embodiment of the refrigerant system of the present invention in the first mode;

[0030] Figure 4 For Figure 3 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0031] Figure 5 Schematic diagram of the refrigerant circuit of the third embodiment of the refrigerant system of the present invention in the first mode;

[0032] Figure 6 Schematic diagram of the refrigerant circuit of the fourth embodiment of the refrigerant system of the present invention in the first mode;

[0033] Figure 7 For Figure 6 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0034] Figure 8 Schematic diagram of the refrigerant circuit of the fifth embodiment of the refrigerant system of the present invention in the first mode;

[0035] Figure 9 For Figure 8 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0036] Figure 10 Schematic diagram of the refrigerant circuit of the sixth embodiment of the refrigerant system of the present invention in the first mode;

[0037] Figure 11 For Figure 10 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0038] Figure 12 Schematic diagram of the refrigerant circuit of the seventh embodiment of the refrigerant system of the present invention in the first mode;

[0039] Figure 13 For Figure 12 Schematic diagram of the refrigerant circuit of the refrigerant system shown in the second mode;

[0040] Figure 14 Schematic diagram of the structure of an embodiment of the first heat exchanger of the present invention;

[0041] Figure 15Schematic structural diagram of another embodiment of the first heat exchanger of the present invention;

[0042] Figure 16 Schematic structural diagram of an embodiment of the plate heat exchanger of the present invention;

[0043] Figure 17 For another embodiment of the plate heat exchanger of the present invention at Figure 16 Partial structural diagram at position A shown;

[0044] Figure 18 For Figure 16 Schematic diagram of the water flow direction of the embodiment shown;

[0045] Figure 19 Schematic diagram of the water flow direction of another embodiment of the plate heat exchanger of the present invention;

[0046] Figure 20 Schematic diagram of the water flow direction of yet another embodiment of the plate heat exchanger of the present invention;

[0047] Figure 21 Schematic structural diagram of the eighth embodiment of the refrigerant system of the present invention.

[0048] Explanation of the reference numerals in the drawings:

[0049]

[0050]

[0051] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0053] 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 invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0054] In the present invention, unless otherwise clearly specified or limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, 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, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0056] The present invention provides a refrigerant system, which includes but is not limited to air conditioners, heat pump devices, etc. Among them, the heat pump device includes but is not limited to ATW (Air-Water) heat pump devices, ATA (Air-Air) heat pump devices, etc. Please refer to Figures 1 to 13 , which is a schematic diagram of the refrigerant circuit of different embodiments of the refrigerant system of the present invention in the first mode or the second mode. The hollow arrows in the figure indicate the flow direction of air and / or water for heat exchange with the first heat exchanger.

[0057] Please refer to Figures 1 to 13 , in some embodiments of the present invention, the refrigerant system includes a compressor 20, a first heat exchanger 10, and a second heat exchanger 40 that are connected and communicate with each other. The first heat exchanger 10 includes a first heat exchange part 10a and a second heat exchange part 10b. The compressor 20 has an exhaust port and a suction port 203. The exhaust port of the compressor is communicated with the first end of the first heat exchange part 10a and the first end of the second heat exchange part 10b. The first end of the second heat exchanger 40 is communicated with the second end of the first heat exchange part 10a and the second end of the second heat exchange part 10b. The second end of the second heat exchanger 40 is communicated with the suction port 203.

[0058] In some embodiments, optionally, the first heat exchange part 10a and the second heat exchange part 10b are provided with a refrigerant flow path and a water flow path for heat exchange. The water in the water flow path is heated by exchanging heat with the refrigerant in the refrigerant flow path, and the heated water can be used as heating hot water and / or domestic hot water, so as to realize heating of the indoor space and / or providing hot water. Of course, in other embodiments, only the refrigerant flow path may be provided in the first heat exchange part 10a and the second heat exchange part 10b.

[0059] In some embodiments, the refrigerant system further includes a control device 80. The control device 80 can control the refrigerant system to switch between a first mode and a second mode. In the first mode, a refrigerant circuit is formed between the compressor, the first heat exchange part 10a, and the second heat exchanger 40, and a refrigerant circuit is formed between the compressor, the second heat exchange part 10b, and the second heat exchanger 40. In the second mode, a refrigerant circuit is formed between the compressor 20, the second heat exchanger 40, and the first heat exchange part 10a, and a refrigerant circuit is formed between the compressor 20, the second heat exchange part 10b, and the first heat exchange part 10a.

[0060] Specifically, in the first mode, a part of the refrigerant flowing out of the exhaust port sequentially passes through the first heat exchange part 10a, the second heat exchanger 40 and returns to the compressor 20, and another part of the refrigerant flowing out of the exhaust port sequentially passes through the second heat exchange part 10b, the second heat exchanger 40 and returns to the compressor 20. In the second mode, a part of the refrigerant flowing out of the exhaust port sequentially passes through the second heat exchanger 40, the first heat exchange part 10a and returns to the compressor 20, and another part of the refrigerant flowing out of the exhaust port sequentially passes through the second heat exchange part 10b, the first heat exchange part 10a and returns to the compressor 20.

[0061] In this embodiment, in the first mode, the control device 80 controls the flow direction of the refrigerant, so that the refrigerant flowing out of the compressor 20 first flows to the first heat exchange part 10a and the second heat exchange part 10b, and then flows to the second heat exchanger 40. At this time, both the first heat exchange part 10a and the second heat exchange part 10b act as condensers, and the second heat exchanger 40 acts as an evaporator to form a heating circuit of the refrigerant. In the second mode, the control device 80 controls the flow direction of the refrigerant, so that the second heat exchanger 40 is converted into a condenser, and at the same time, one of the first heat exchange part 10a and the second heat exchange part 10b continues to act as a condenser, and the other is converted into an evaporator to form a new refrigerant heating circuit, so that a part of the refrigerant flowing out of the exhaust port can maintain the continuity of heating and improve the use comfort, while the other part of the refrigerant is used to make the second heat exchanger 40 generate heat by itself to melt the ice and frost on its own surface.

[0062] It should be noted that when the refrigerant system is configured as an air conditioner, the first heat exchanger is used for heat exchange with the air in the indoor space. It can be entirely arranged in the indoor space, entirely arranged in the outdoor space, or part of it arranged in the indoor space and the other part arranged in the outdoor space. That is, the present application does not specifically limit the layout position of the first heat exchanger. Similarly, the present application also does not specifically limit the layout position of the second heat exchanger.

[0063] In the technical solution of the present invention, through the control device 80, in the second mode, the refrigerant system can defrost the second heat exchanger 40 without stopping the compressor 20 and continuously supplying heat from the first heat exchanger. This not only provides continuous and stable heating to improve the comfort of use but also reduces the risk of failures caused by frequent start-stop of the main electrical components such as the compressor 20, thereby extending the service life of the compressor 20 and the refrigerant system.

[0064] Please refer to Figure 1 and Figure 2 , in an embodiment, the control device 80 is configured as a single four-way reversing valve 81. The first end of the second heat exchange part 10b is communicated with the exhaust port. The E port (i.e., the first port) of the four-way reversing valve 81 is communicated with the first end of the first heat exchange part 10a. The C port (i.e., the second port) of the four-way reversing valve 81 is communicated with the second end of the second heat exchanger 40. The D port (i.e., the third port) of the four-way reversing valve 81 is communicated with the exhaust port. The S port (i.e., the fourth port) of the four-way reversing valve 81 is communicated with the suction port 203. The first end of the second heat exchanger 40 is communicated with the second end of the first heat exchange part 10a and the second end of the second heat exchange part 10b. In this way, the defrosting function of the compressor 20 of the refrigerant system without stopping can be realized through a single four-way reversing valve 81. The structure is simple and easy to implement, and can significantly reduce the production cost and maintenance cost of the refrigerant system.

[0065] Specifically, in this embodiment, in the first mode, the single four-way reversing valve 81 controls the flow direction of the refrigerant, so that the refrigerant flowing out of the compressor 20 first flows to the first heat exchange part 10a and the second heat exchange part 10b, and then flows to the second heat exchanger 40. At this time, both the first heat exchange part 10a and the second heat exchange part 10b act as condensers, and the second heat exchanger 40 acts as an evaporator to form a heating circuit of the refrigerant. In the second mode, the four-way reversing valve 81 controls the flow direction of the refrigerant, so that the second heat exchanger 40 is converted into a condenser, and at the same time the second heat exchange part 10b continues to act as a condenser, while the first heat exchange part 10a is converted into an evaporator to form a new heating circuit of the refrigerant, so that part of the refrigerant can be kept for heating the indoor space, and the other part of the refrigerant is used to make the second heat exchanger 40 self-heat to melt the ice and frost on its own surface.

[0066] It is worth mentioning that when the refrigerant system is configured as an air conditioner or an ATA heat pump device, for the refrigerant system configured with a single four-way reversing valve 81, the second mode can also be used as a dehumidification mode, that is, these two functional modes can be provided to the user at the same time for the user to select and turn on according to needs. Specifically, the main purpose of using the second mode in severe winter is to convert the second heat exchanger 40 into a condenser to remove the frost on the outer surface of the second heat exchanger 40, while the main purpose of using the dehumidification mode in the plum rain season is to convert the first heat exchange part 10a into an evaporator to absorb heat and dehumidify the indoor air, and use the second heat exchange part 10b as a condenser to heat the dehumidified air, so as to provide dry and warm air for the indoor space and avoid significant fluctuations in indoor temperature.

[0067] Please refer to Figure 5 , in another embodiment, the control device 80 may further include a four-way reversing valve 81 and a solenoid valve 82. The first end of the second heat exchange part 10b is connected to the exhaust port through the solenoid valve 82. The E port of the four-way reversing valve 81 is connected to the first end of the first heat exchange part 10a. The C port of the four-way reversing valve 81 is connected to the second end of the second heat exchanger 40. The D port of the four-way reversing valve 81 is connected to the exhaust port. The S port of the four-way reversing valve 81 is connected to the suction port 203. The first end of the second heat exchanger 40 is connected to the second end of the first heat exchange part 10a and the second end of the second heat exchange part 10b. In this way, when the refrigerant system enters the first mode and the second mode, the solenoid valve 82 is opened to conduct the second heat exchange part 10b and the second exhaust port 202; when the refrigerant system enters the refrigeration mode, the solenoid valve 82 is closed to cut off the second heat exchange part 10b and the second exhaust port 202, and stop the second heat exchange part 10b from working, so as to avoid the second heat exchange part 10b being converted into a condenser and affecting the refrigeration effect of the first heat exchange part 10a on the indoor air.

[0068] Of course, the control device 80 can also adopt other structural forms, such as a control valve group composed of multiple control valves, as long as it can control the switching of the refrigerant flow direction to achieve the switching between the first mode and the second mode, and the present application does not limit this.

[0069] Please refer to Figures 1 to 9 , in some embodiments, the exhaust port includes a first exhaust port 201 and a second exhaust port 202. The first exhaust port 201 is connected to the D port of the four-way reversing valve 81, and the second exhaust port 202 is directly connected to the first end of the second heat exchange part 10b. In this way, it is convenient to distribute the refrigerant with different pressures and flows into the four-way reversing valve and the second heat exchange part.

[0070] Of course, please refer to Figures 10 to 13, in some other embodiments, the exhaust port may also be configured to be one. The refrigerant system further includes a shunt pipeline 92, and the shunt pipeline 92 has two shunt outlets 921 that are communicated with each other. The inlet of the shunt pipeline 92 is communicated with the exhaust port, one shunt outlet 921 is communicated with the D port of the four-way reversing valve 81, and the other shunt outlet 921 is communicated with the first end of the second heat exchange part 10b. In this way, the structure of the refrigerant system can be simplified, and its manufacturing cost and maintenance cost can be reduced.

[0071] Please refer to Figures 1 to 13 , in some embodiments, the refrigerant system further includes a first throttling device 30. The first end of the first throttling device 30 is communicated with the second end of the first heat exchange part 10a and the second end of the second heat exchange part 10b, and the second end of the first throttling device 30 is communicated with the first end of the second heat exchanger 40. Specifically, in the first mode, the refrigerant flowing out of the first heat exchange part 10a and the refrigerant flowing out of the first heat exchange part 10b converge and then flow into the first throttling device 30 together, and then flow through the first throttling device 30 and the second heat exchanger 40 and return to the compressor 20, as Figure 1 , Figure 6 or Figure 10 shown; in the second mode, the refrigerant flowing out of the second heat exchanger 40 flows into the first throttling device 30, and after being throttled by the first throttling device 30, it converges with the refrigerant flowing out of the first heat exchange part 10b, and then flows together to the first heat exchange part 10a, and finally returns to the compressor 20 through the suction port of the compressor 20, as Figure 2 , Figure 7 or Figure 11 shown. In this way, the first throttling device 30 can throttle the refrigerant from the first heat exchange part 10a and the first heat exchange part 10b simultaneously in the first mode, which is beneficial to improving the heat exchange efficiency of the refrigerant in the second heat exchanger 40.

[0072] Of course, in other embodiments, it may also be that the first end of the first throttling device 30 is communicated with the second end of the first heat exchange part 10a, and the second end of the first throttling device 30 is communicated with the first end of the second heat exchanger 40 and the second end of the first heat exchange part 10b, that is, the second end of the first heat exchange part 10b is directly communicated with the first end of the second heat exchanger 40; or, the first end of the first throttling device 30 is communicated with the second end of the first heat exchange part 10b, and the second end of the first throttling device 30 is communicated with the first end of the second heat exchanger 40 and the second end of the first heat exchange part 10a, that is, the second end of the first heat exchange part 10a is directly communicated with the first end of the second heat exchanger 40. Of course, the first throttling device 30 may also not be provided.

[0073] Please refer to Figures 1 to 9, in the embodiment where the exhaust port includes a first exhaust port 201 and a second exhaust port 202, optionally, the refrigerant pressures of the first exhaust port 201 and the second exhaust port 202 are configured to be different. The refrigerant system further includes a second throttling device 51. The first end of the second throttling device 51 communicates with the second end of the one with a larger refrigerant pressure in the first heat exchange part 10a and the second heat exchange part 10b in the first mode, and the second end of the second throttling device 51 communicates with the first end of the first throttling device 30. Thus, in the first mode, the second throttling device 51 can pre-throttle the refrigerant flow path with a larger pressure to reduce its refrigerant pressure, which is beneficial to the convergence of the refrigerant in this refrigerant flow path and the refrigerant in another refrigerant flow path downstream. Of course, in other embodiments, the second throttling device 51 may not be provided, and only the first throttling device 30 is provided.

[0074] Specifically, optionally, please refer to Figures 1 to 4 , in some embodiments, the refrigerant pressure of the first exhaust port 201 is higher than that of the second exhaust port 202, which is called the medium-pressure constant operation scheme. At this time, the high-pressure refrigerant can enter the second heat exchanger in the second mode to improve the defrosting efficiency and effect. Please refer to Figures 6 to 9 , in some other embodiments, the refrigerant pressure of the first exhaust port 201 is lower than that of the second exhaust port 202, which is the high-pressure constant operation scheme. At this time, the high-pressure refrigerant can enter the first heat exchanger in the second mode to ensure the heating efficiency and effect of the first heat exchanger. Of course, in other embodiments, the refrigerant pressure of the first exhaust port 201 may also be equal to that of the second exhaust port 202.

[0075] Please refer to Figures 1 to 4 , in the embodiment of medium-pressure constant operation, optionally, the second end of the second heat exchange part 10b communicates with the first end of the first throttling device 30. Thus, the structure of the refrigerant system can be simplified without affecting the performance of the refrigerant system. It is worth mentioning that the second throttling device 51 can also perform a second throttling on the converged refrigerant in the second mode, which is beneficial to improving the heat exchange efficiency of the refrigerant entering the first heat exchange part.

[0076] Specifically, please refer to Figure 1 and Figure 3 , in the first mode, the refrigerant flowing out from the second end of the first heat exchange part 10a first undergoes the throttling effect of the second throttling device 51 and reduces the pressure, then converges with the refrigerant flowing out from the second end of the second heat exchange part, and together flows into the first end of the first throttling device 30. Please refer to Figure 2 and Figure 4 , in the second mode, the refrigerant flowing out from the first end of the second heat exchanger 40 first undergoes the throttling effect of the first throttling device 30 and reduces the pressure, then converges with the refrigerant flowing out from the second end of the second heat exchange part, and together flows into the second end of the second throttling device 51.

[0077] It can be understood that in this embodiment, by disposing the second throttling device 51 between the second end of the first heat exchange part 10a and the first end of the first throttling device 30, the second throttling device 51 can throttle the refrigerant flow path with a relatively high pressure in both the first mode and the second mode, and the structure is simple and easy to implement.

[0078] Please refer to Figures 6 to 9 , in the embodiment of normal operation under high pressure, optionally, the refrigerant system further includes a fourth throttling device 52, and the second end of the first heat exchange part 10a is connected to the first end of the first throttling device 30 through the fourth throttling device 52. It can be understood that in the first mode, since the pressure of the refrigerant flowing out of the first heat exchange part 10a is lower than that of the refrigerant flowing out of the second heat exchange part 10a, by controlling the fourth throttling device 52 to be in a fully open state to reduce its throttling and pressure reducing effect on the refrigerant, while the second throttling device 51 is in a throttling state (i.e., between fully open and fully closed) to normally throttle and reduce the pressure of the refrigerant, so that the pressures of the refrigerant flowing out of the second throttling device 51 and the fourth throttling device 52 can be closer to each other, which is beneficial to their confluence. In the second mode, both the second throttling device 51 and the fourth throttling device 52 are in a throttling state to throttle and reduce the pressure of the refrigerant twice successively. Of course, in other embodiments, the fourth throttling device may not be provided.

[0079] Please refer to Figures 10 to 13 , in the embodiment where the exhaust port is configured as one, optionally, a second throttling device 51 is provided, that is, the first end of the second throttling device 51 is connected to the second end of the first heat exchange part 10a, and the second end of the second throttling device 51 is connected to the first end of the first throttling device 30. It can be understood that since the pressures of the refrigerant flowing out of the two split outlets 921 are the same, therefore, please refer to Figure 10 , in the first mode, control the second throttling device 51 to be in a fully open state, so that the pressures of the refrigerant flowing out of the second throttling device 51 and the second heat exchange part 10b are closer to each other, which is beneficial to their confluence. Please refer to Figure 11 , in the second mode, then control the second throttling device 51 to switch to a throttling state. At this time, the second throttling device 51 can perform secondary throttling and pressure reduction on the confluent refrigerant. Of course, in other embodiments where the exhaust port is configured as one, the second throttling device may not be provided.

[0080] It can be understood that in the embodiment where the exhaust port is configured as one, by adjusting the opening degree of the second throttling device 51, the refrigerant flow rates flowing out of the two split outlets 921 can also be adjusted, so as to realize the adjustment of the refrigerant flow rates flowing into the first heat exchange part 10a and the second heat exchange part 10b in the first mode. For example, when the second throttling device 51 is in a fully closed state, the refrigerant will not flow into the first heat exchange part 10a, and the refrigerant flow rate flowing into the second heat exchange part 10b reaches the maximum value.

[0081] Please refer to Figure 3 、 Figure 4 、 Figure 8 、 Figure 9 、 Figure 12 、 Figure 13 and Figure 21 In some other embodiments, the refrigerant system further includes an economizer 61, a make-up gas pipeline 62 and a third throttling device 63. A third refrigerant flow path 611 and a fourth refrigerant flow path 612 for heat exchange are provided in the economizer 61. The first end of the third refrigerant flow path 611 is communicated with the second ends of the first heat exchange part 10a and the second heat exchange part 10b. The first end of the second heat exchanger 40 is communicated with the second end of the third refrigerant flow path 611 and the first end of the fourth refrigerant flow path 612. The second end of the fourth refrigerant flow path 612 is communicated with the gas replenishing port 204 of the compressor 20 through the make-up gas pipeline 62. Thus, by adding the economizer 61, the make-up gas pipeline 62 and the third throttling device 63, the effect of gas replenishing and enthalpy increase can be achieved to improve the operation efficiency of the refrigerant system and reduce the energy consumption.

[0082] Please refer to Figure 3 and Figure 4 In some embodiments, optionally, the first end of the second throttling device 51 is communicated with the second end of the first heat exchange part 10a, and the second end of the second throttling device 51 is communicated with the first end of the third refrigerant flow path 611. Specifically, in the first mode, the refrigerant flowing out from the second end of the first heat exchange part 10a first undergoes the throttling effect of the second throttling device 51 to reduce the pressure, and then converges with the refrigerant flowing out from the second end of the second heat exchange part, and they flow into the first end of the third refrigerant flow path 611 of the economizer 61 together; in the second mode, the refrigerant flowing out from the first end of the second heat exchanger 40 first undergoes the throttling effect of the first throttling device 30 to reduce the pressure, then flows through the third refrigerant flow path 611 and converges with the refrigerant flowing out from the second end of the second heat exchange part, and they flow into the second end of the first heat exchange part 10a together.

[0083] In some embodiments, the first heat exchange part 10a and the second heat exchange part 10b are arranged adjacent to each other. Thus, when the refrigerant system is in the second mode, heat exchange can occur between the first heat exchange part 10a and the second heat exchange part 10b first to reduce the refrigeration effect of the first heat exchange part 10a as the evaporator on the surrounding air, thereby reducing the fluctuation of the indoor temperature. Of course, in other embodiments, the first heat exchange part 10a and the second heat exchange part 10b may also be arranged far away from each other.

[0084] Please refer to Figure 2 、 Figure 14 and Figure 15, in some embodiments, the refrigerant system further includes an indoor fan 91, and the indoor fan 91 is used to drive air to flow from the first heat exchange part 10a to the second heat exchange part 10b. In this way, when the refrigerant system is in the second mode, the air first flows through the first heat exchange part 10a serving as an evaporator to be cooled and dehumidified, and then flows through the second heat exchange part 10b serving as a condenser to be heated up, so as to provide dry and warm air for the indoor space. Of course, in other embodiments, it may also be that the indoor fan is used to drive air to flow from the second heat exchange part 10b to the first heat exchange part 10a.

[0085] Please refer to Figures 1 to 14 , in some embodiments, the first heat exchange part 10a and the second heat exchange part 10b are integrated into the same first heat exchanger 10. In this way, the structure of the refrigerant system can be simplified, and it is convenient for transportation and installation. Of course, please refer to Figure 15 , in some other embodiments, the first heat exchange part 10a and the second heat exchange part 10b may also be configured as two independent first heat exchangers 10.

[0086] Specifically, there are various structural forms of the first heat exchanger 10. For example, please refer to Figure 14 or Figure 15 , in the embodiments provided with an indoor fan, the first heat exchanger 10 is only provided with a refrigerant flow path, that is, both the first heat exchange part 10a and the second heat exchange part 10b are provided with refrigerant flow paths, and the indoor fan drives air to flow through the outer surface of the refrigerant flow path for heat exchange. Optionally, in this embodiment, the first heat exchanger 10 may be a finned tube heat exchanger, a coil heat exchanger, a microchannel flat tube heat exchanger, etc., which are not specifically limited in this application.

[0087] Of course, the first heat exchanger 10 may also be of other structural forms. For example, please refer to Figures 16 to 20 , in some other embodiments, the first heat exchanger 10 is provided with a refrigerant flow path and a water flow path that are parallel and exchange heat with each other, that is, both the first heat exchange part 10a and the second heat exchange part 10b are provided with a refrigerant flow path and a water flow path that are parallel and exchange heat with each other. In this way, the water in the water flow path of the first heat exchanger 10 first exchanges heat with the refrigerant, and then flows into the heating water pipe in the indoor space to exchange heat with the indoor air to realize the temperature adjustment of the indoor air. Of course, the water after exchanging heat with the refrigerant may also be used as domestic hot water. At this time, the refrigerant system is a heat pump system and realizes the function of a heat pump water heater.

[0088] It can be understood that whether a single four-way reversing valve or other forms of control devices 80 are adopted, the refrigerant system of the present application can defrost the second heat exchanger 40 without stopping the compressor 20, and can reduce the water temperature fluctuation in the water flow path, thereby reducing the water temperature fluctuation of domestic hot water or heating hot water, and improving the thermal comfort and user experience of the indoor space.

[0089] In an embodiment where the first heat exchanger 10 is provided with a refrigerant flow path and a water flow path that are parallel and exchange heat with each other, preferably, the first heat exchanger 10 is configured as a plate heat exchanger. Of course, in other embodiments, the first heat exchanger may also be configured as a finned tube heat exchanger, a coil heat exchanger, or a microchannel flat tube heat exchanger.

[0090] Please refer to Figures 16 to 20 , where Figure 16 and Figure 17 show schematic structural diagrams of two embodiments of the plate heat exchanger of the present invention. The solid arrows in the figures represent the flow direction of water, and the hollow arrows represent the flow direction of the refrigerant; Figures 18 to 20 shows a schematic diagram of the water flow direction of three embodiments of the plate heat exchanger of the present invention, and Figure 18 the shown embodiment corresponds to Figure 16 the shown embodiment. The solid arrows in the figures represent the flow direction of water, and the dashed arrows represent the flow direction of the refrigerant. The upper horizontal water path in the figure corresponds to Figure 16 the first flow hole in the upper right of the plate shown, and the lower horizontal water path corresponds to Figure 16 the first flow hole in the lower right of the plate shown.

[0091] Specifically, please refer to Figures 16 to 20 , in some embodiments, the refrigerant flow path includes a first refrigerant flow path 101 and a second refrigerant flow path 102, the water flow path includes a first water flow path 103 corresponding to the first refrigerant flow path 101, and a second water flow path 104 corresponding to the second refrigerant flow path 102. The water flow path is provided with a water inlet 105, a first water outlet 106 corresponding to the first water flow path 103, and a second water outlet 107 corresponding to the second water flow path 104. Both the first refrigerant flow path 101 and the second refrigerant flow path 102 are provided with a liquid inlet 108 and a liquid outlet 109. That is, the plate heat exchanger is configured with an independent dual-refrigerant flow path and shares the same water flow path. Specifically, the first refrigerant flow path 101 corresponds to the refrigerant flow path on the first heat exchange part 10a, and the second refrigerant flow path 102 corresponds to the refrigerant flow path on the second heat exchange part 10b; the first water flow path 103 corresponds to the water flow path on the first heat exchange part 10a, and the second water flow path 104 corresponds to the water flow path on the second heat exchange part 10b.

[0092] In this embodiment, by simultaneously providing a first water outlet 106 and a second water outlet 107 on a single plate heat exchanger 10 system, it is possible to allow the water in the first water path 103 and the second water path 104 to be output from the first water outlet 106 and the second water outlet 107 respectively after undergoing different degrees of heat exchange, so as to be able to externally provide hot water at two different water temperatures to simultaneously meet different heat usage requirements. Specifically, among the hot water output from the first water outlet 106 and the second water outlet 107, the hot water with a higher water temperature can be used as domestic hot water, and the hot water with a lower water temperature can be used as heating hot water. In this way, a set of plate heat exchanger 10 can achieve the simultaneous supply of hot water at different outlet temperatures, thereby reducing the initial investment cost of the equipment and the subsequent maintenance cost, that is, reducing the usage cost of the refrigerant system.

[0093] It can be understood that in a solution that uses a multi-connected heating system to meet the supply of hot water at two water temperatures, if heating hot water is given priority, the domestic hot water needs to be additionally heated by electricity due to the unqualified outlet water temperature, resulting in a large amount of electrical energy consumption; if domestic hot water is given priority, that is, the outlet water temperature is relatively high, it is necessary to mix cold water into the heating facilities to make it reach the required relatively low-temperature hot water, and this method also has a high energy consumption. The plate heat exchanger 10 of the present application has a single-inlet and double-outlet water path system, and can externally provide hot water at two different water temperatures simultaneously after the water in the first water path 103 and the second water path 104 undergoes different degrees of heat exchange, so as to simultaneously meet the usage requirements of domestic hot water and heating hot water, and further reduce the energy consumption of the refrigerant system.

[0094] Please refer to Figure 16 or Figure 17 , in some embodiments, the plate heat exchanger 10 includes a plurality of plates, and the plurality of plates include a plurality of water path plates 13 and refrigerant flow path plates 14 that are alternately distributed. The plates have two first flow holes 15 for water to flow through and two second flow holes 16 for refrigerant to flow through. The inner cavity of the water path plate 13 is connected to the first flow hole 15 and is separated from the second flow hole 16, and the inner cavity of the refrigerant flow path plate 14 is connected to the second flow hole 16 and is separated from the first flow hole 15.

[0095] Furthermore, the two second flow holes 16 of the outermost plate of the first end portion 10c are respectively connected to a set of liquid inlet 108 and liquid outlet 109, and the two second flow holes of the outermost plate of the second end portion 10d are respectively connected to another set of liquid inlet 108 and liquid outlet 109.

[0096] Specifically, please refer to Figure 16, two first flow holes 15 and two second flow holes 16 are respectively arranged at the four corners of the plate. Whether it is the water channel plate 13 or the refrigerant flow path plate 14, the two first flow holes 15 on the left are used to transport the refrigerant, and the two second flow holes 16 on the right are used to transport water; the inner cavity of the refrigerant flow path plate 14 is only connected to the two second flow holes 16 on the left, and the inner cavity of the water channel plate 13 is only connected to the two first flow holes 15 on the right.

[0097] It can be understood that there are various ways to achieve heat exchange at different levels. For example, please refer to Figure 16 , Figure 18 and Figure 19 . In some embodiments, the water inlet 105 is connected to the first water channel 103, and the first water channel 103 and the second water channel 104 are connected in series, so that the outlet water temperatures of the first water outlet 106 and the second water outlet 107 are different. In this embodiment, a part of the water flowing into the plate heat exchanger 10 from the water inlet 105 flows through the first water channel 103 and then directly flows out from the first water outlet 106, and the other part continues to flow through the second water channel 104 and then flows out from the second water outlet 107. Thus, the hot water flowing out from the second water outlet 107 has a higher water temperature after two heat exchanges. It can be understood that at this time, the refrigerant temperatures in the first refrigerant flow path 101 and the second refrigerant flow path 102 can be set to be the same or different.

[0098] Optionally, please refer to Figure 16 . The plate heat exchanger 10 has opposite first end 10c and second end 10d. The first end 10c is arranged at the first heat exchange part 10a, and the second end 10d is arranged at the second heat exchange part 10b. A first flow hole 15 of the plate at the outermost side of the first end 10c is connected to the water inlet 105, and the first flow hole 15 corresponding to the water inlet 105 of the plate at the outermost side of the second end 10d is connected to the second water outlet 107. A partition 11 is provided at the first flow hole 15 corresponding to the water inlet 105 of a plate in the middle to connect the first water channel 103 and the second water channel 104 in series.

[0099] Specifically, please refer to Figure 16, the upper right first flow hole 15 of the refrigerant flow path plate 14 located at the outermost side of the first end portion 10c communicates with the water inlet 105, and a partition 11 is provided at the lower right first flow hole 15 of the refrigerant flow path plate 14 to block the water from flowing through the first flow hole 15. Two second flow holes 16 at the upper left and lower left of the refrigerant flow path plate 14 communicate with external refrigerant pipes respectively to form a first independent refrigerant circuit; the upper right first flow hole 15 of the refrigerant flow path plate 14 located at the outermost side of the second end portion 10d communicates with the second water outlet 107, and the second flow holes 16 at the upper left and lower left of the refrigerant flow path plate 14 communicate with external refrigerant pipes to form a second independent refrigerant circuit; a partition 11 is provided at the upper right first flow hole 15 of a refrigerant flow path plate 14 located in the middle to block the water from flowing through the first flow hole 15. In this way, the water in the first heat exchange portion 10a cannot flow into the second heat exchange portion 10b through the first flow hole 15, and can only flow into the second heat exchange portion 10b through the lower right first flow hole 15 of the refrigerant flow path plate 14, thus realizing the series connection of the first water path and the second water path. In this way, the hot water flowing out from the second water outlet 107 undergoes heat exchange twice successively on the first heat exchange portion and the second heat exchange portion and has a higher water temperature.

[0100] It can be understood that the plate located at the outermost side of the first end portion 10c and the plate located at the outermost side of the first end portion 10c can also be a water path plate, and is not necessarily limited to Figure 16 the refrigerant flow path plate of the illustrated embodiment, and the present application does not make specific limitations thereto.

[0101] The layout position of the second water outlet 107 has various forms. For example, please refer to Figure 16 and Figure 18 , in an embodiment, a partition 11 is provided at another first flow hole 15 of the plate located at the outermost side of the first end portion 10c, and another first flow hole 15 of the plate located at the outermost side of the second end portion 10d communicates with the first water outlet 106. Of course, in another embodiment, it can also be that another first flow hole 15 of the plate located at the outermost side of the first end portion 10c communicates with the first water outlet 106, and a partition 11 is provided at another first flow hole 15 of the plate located at the outermost side of the second end portion 10d.

[0102] Specifically, please refer to Figure 16 and Figure 18 , in an embodiment, a partition 11 is provided at the lower right first flow hole 15 of the refrigerant flow path plate 14 located at the outermost side of the first end portion 10c to block the water from flowing out of the plate heat exchanger through the first flow hole 15, and the lower right first flow hole 15 of the refrigerant flow path plate 14 located at the outermost side of the second end portion 10d communicates with the first water outlet 106. At this time, the first water outlet 106 and the second water outlet 107 are arranged in the same direction. In this way, the centralized layout of the water outlet pipeline can be facilitated.

[0103] Please refer to Figure 19 In another embodiment, the first water outlet 106 and the second water outlet 107 are arranged in opposite directions. Specifically, the first flow-through hole 15 in the lower right of the refrigerant flow path plate 14 at the outermost side of the first end 10c communicates with the first water outlet 106, and a partition 11 is provided in the first flow-through hole 15 in the lower right of the refrigerant flow path plate 14 at the outermost side of the second end 10d to block water from flowing out of the plate heat exchanger through the first flow-through hole 15.

[0104] It can be understood that the partition 11 can either be directly formed on the plate, that is, the partition 11 is integrally formed directly during the manufacturing of the plate. In this case, there is no first flow-through hole 15 in the area corresponding to the partition 11 after the plate is manufactured and formed; the partition 11 can also be formed separately from the plate and then assembled into one body. In this case, the manufactured and formed plate has four through holes, and the partition 11 is assembled and fixed in the first flow-through hole 15 of the plate by means of bonding, welding, etc.

[0105] Please refer to Figure 16 In one embodiment, optionally, the partition 11 for changing the refrigerant flow direction (referred to as the refrigerant-side partition 11) and the partition 11 for changing the water flow direction (referred to as the water-side partition 11) are provided on different plates. Specifically, in this embodiment, the refrigerant-side partition 11 is provided on an adjacent plate in front of the water-side partition 11. Of course, in other embodiments, the refrigerant-side partition 11 can also be provided on an adjacent plate behind the water-side partition 11.

[0106] Please refer to Figure 17 In another embodiment, the refrigerant-side partition 11 and the water-side partition 11 can also be provided on the same plate. Specifically, the fourth plate in the direction from front to back is provided with both the refrigerant-side partition 11 and the water-side partition 11 at the same time. At this time, the water-side partition 11 is arranged as a half partition, that is, the water-side partition 11 only blocks the rear side of the first flow-through hole 15 in the upper right of the plate, but the first flow-through hole 15 is still connected to the inner cavity of the plate. Then, water cannot flow through the first flow-through hole 15 but can turn and flow into the inner cavity of the plate. Since the half partition means that only one side of the first flow-through hole 15 is blocked, correspondingly, the full partition means that both the front and rear sides of the first flow-through hole 15 are blocked. It can be understood that at this time, the refrigerant-side partition 11 can be either a full partition or a half partition, and the refrigerant will not flow into this plate.

[0107] Of course, in other embodiments, it can also be that the fifth plate in the direction from front to back is provided with both the refrigerant-side partition 11 and the water-side partition 11 at the same time. At this time, the refrigerant-side partition 11 is arranged as a half partition, and the water-side partition 11 can be either a full partition or a half partition. Those skilled in the art can adjust the layout position of the partition 11 according to needs.

[0108] Of course, other methods can also be used to achieve different degrees of heat exchange. For example, please refer toFigure 20 In yet another embodiment, the water inlet 105 is in communication with both the first water path 103 and the second water path 104, and the pressures of the refrigerant flowing into the first refrigerant flow path 101 and the second refrigerant flow path 102 are configured to be different, such that the water outlet temperatures of the first water outlet 106 and the second water outlet 107 are different. Specifically and optionally, one water-side partition of this embodiment is provided on the refrigerant flow path plate at the outermost side of the second end portion 10d, and the other water-side partition is provided on the refrigerant flow path plate in the middle, so that the water flowing into the plate heat exchanger 10 from the water inlet 105 is divided into two streams and flows in the first water path 103 and the second water path 104 respectively, and exchanges heat with the refrigerant in the first refrigerant flow path 101 and the second refrigerant flow path 102 respectively, and then these two streams of hot water flow out of the plate heat exchanger respectively. By setting the refrigerant temperatures in these two refrigerant flow paths to be different, the heat exchange degrees of the first water path 103 and the second water path 104 are made different. That is to say, the first water path 103 and the second water path 104 are arranged in parallel.

[0109] It can be understood that using a single compressor 20 to output multiple streams of refrigerant with different pressures is based on the idea of cascaded utilization of energy. Therefore, this application does not specifically limit the number of the exhaust ports of the compressor 20, the refrigerant flow paths, and the water paths. That is to say, when using a large-displacement compressor 20 with three or more exhaust ports, the plate heat exchanger 10 can be synchronously provided with corresponding numbers of refrigerant flow paths and water paths, so as to fully exert the effect of cascaded utilization of energy.

[0110] Specifically, in an embodiment where the refrigerant pressure at the first exhaust port 201 is higher than the refrigerant pressure at the second exhaust port 202, the first exhaust port 201 is in communication with the second refrigerant flow path 102, and the second exhaust port 202 is in communication with the first refrigerant flow path 101. That is to say, in the first mode, the high-pressure exhaust of the compressor 20 flows into the second refrigerant flow path 102, and the medium-pressure exhaust flows into the first refrigerant flow path 101. In this way, the water temperature flowing out of the second water path 104 is higher to be used as domestic hot water, and the water temperature flowing out of the first water path 103 is lower to be used as heating hot water.

[0111] Of course, in other embodiments, it may also be that the refrigerant temperatures of the first refrigerant flow path 101 and the second refrigerant flow path 102 are configured to be the same, and the effective heat exchange areas of the first water path 103 and the second water path 104 are configured to be different. For example, in an embodiment where the water inlet 105 is in communication with both the first water path 103 and the second water path 104, optionally, the heat exchange path between the first refrigerant flow path 101 and the first water path 103 is longer, or the total heat exchange area between the two is larger, so that the water temperature at the first water outlet 106 is higher.

[0112] Please refer to Figures 16 to 20, it can be understood that, optionally, in the embodiments of the present invention, regardless of the water flow directions in the first waterway 103 and the second waterway 104, the refrigerant flow direction is configured to be opposite thereto. In this way, the heat exchange efficiency of water and refrigerant can be improved.

[0113] Please refer to Figure 21 , in some embodiments, a flow valve 12 is provided on the first water outlet 106 and / or the second water outlet 107 to adjust the water flow rates of the first water outlet 106 and the second water outlet 107. In this way, the water flow rate can be adjusted by controlling the flow valve 12. According to the load requirements of the user, the flow rate and water temperature of the corresponding waterway can be adjusted, that is, variable load adjustment is realized, thereby improving the convenience and flexibility of the refrigerant system. It can be understood that if the flow valve 12 is completely closed, the water path of the plate heat exchanger 10 changes from a single-in double-out system to a single-in single-out system. Of course, in other embodiments, solenoid valves can also be provided on both the first water outlet 106 and the second water outlet 107, or the flow valve 12 can be not provided.

[0114] The water outlet temperature of the first water outlet 106 is lower than the water outlet temperature of the second water outlet 107, and the flow valve 12 is provided on the first water outlet 106. In this way, by setting the flow valve 12 on the first water outlet 106 with a lower water outlet temperature, the first water outlet 106 can be completely closed, thus meeting the user's demand for only using domestic hot water. Of course, in other embodiments, the flow valve 12 can also be provided on the second water outlet 107, or flow valves 12 are provided on both the first water outlet 106 and the second water outlet 107.

[0115] Please refer to Figure 21 , in an embodiment, the refrigerant system further includes a gas-liquid separator 70, and the gas-liquid separator 70 communicates with the second end of the second heat exchanger 40 and the suction port of the compressor 20. In this way, the problem of refrigerant liquid slugging can be avoided. Of course, in other embodiments, the gas-liquid separator 70 can also be not provided.

[0116] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A refrigerant system, characterized in that, it includes: a compressor having an exhaust port; a first heat exchanger and a second heat exchanger communicated with the compressor, the first heat exchanger includes a first heat exchange part and a second heat exchange part, and the first heat exchange part and the second heat exchange part are provided with refrigerant flow paths and water paths for heat exchange; and a control device, the control device can control the refrigerant system to switch between a first mode and a second mode. In the first mode, a refrigerant circuit is formed between the compressor and the first heat exchange part and the second heat exchanger, and a refrigerant circuit is formed between the compressor and the second heat exchange part and the second heat exchanger; In the second mode, a refrigerant circuit is formed between the compressor and the second heat exchanger and the first heat exchange part, and a refrigerant circuit is formed between the compressor and the second heat exchange part and the first heat exchange part.

2. The refrigerant system according to claim 1, characterized in that, the compressor also has a suction port, the control device includes a four-way reversing valve, the first end of the second heat exchange part is communicated with the exhaust port, the first interface of the four-way reversing valve is communicated with the first end of the first heat exchange part, the second interface of the four-way reversing valve is communicated with the second end of the second heat exchanger, the third interface of the four-way reversing valve is communicated with the exhaust port, the fourth interface of the four-way reversing valve is communicated with the suction port, and the first end of the second heat exchanger is communicated with the second end of the first heat exchange part and the second end of the second heat exchange part.

3. The refrigerant system according to claim 2, characterized in that, the refrigerant system further includes a first throttling device, the first end of the first throttling device is communicated with the second end of the first heat exchange part and the second end of the second heat exchange part, and the second end of the first throttling device is communicated with the first end of the second heat exchanger.

4. The refrigerant system according to claim 3, characterized in that, the exhaust port includes a first exhaust port and a second exhaust port, the first exhaust port is communicated with the third interface of the four-way reversing valve, and the second exhaust port is communicated with the first end of the second heat exchange part.

5. The refrigerant system according to claim 4, characterized in that, the refrigerant system further includes a second throttling device, the first end of the second throttling device is communicated with the second end of the one with a larger refrigerant pressure in the first heat exchange part and the second heat exchange part in the first mode, and the second end of the second throttling device is communicated with the first end of the first throttling device.

6. The refrigerant system according to claim 5, characterized in that, the refrigerant pressure of the first exhaust port is higher than that of the second exhaust port, and the second end of the second heat exchange part is communicated with the first end of the first throttling device; Or, the refrigerant pressure of the first exhaust port is lower than that of the second exhaust port, the refrigerant system further includes a fourth throttling device, and the second end of the first heat exchange part is communicated with the first end of the first throttling device through the fourth throttling device.

7. The refrigerant system according to claim 3, characterized in that, The exhaust port is configured to be one. The refrigerant system further includes a shunt pipeline which has two shunt outlets in communication. The inlet of the shunt pipeline communicates with the exhaust port. One of the shunt outlets communicates with the third interface of the four-way reversing valve, and the other shunt outlet communicates with the first end of the second heat exchange part.

8. The refrigerant system according to claim 7, wherein, the refrigerant system further includes a second throttling device. The first end of the second throttling device communicates with the second end of the first heat exchange part, and the second end of the second throttling device communicates with the first end of the first throttling device.

9. The refrigerant system according to claim 5 or 8, wherein, the refrigerant system further includes an economizer, a make-up gas pipeline and a third throttling device. The economizer is provided with a third refrigerant flow path and a fourth refrigerant flow path for heat exchange. The first end of the third refrigerant flow path communicates with the second end of the first heat exchange part and the second end of the second heat exchange part. The first end of the second heat exchanger communicates with the second end of the third refrigerant flow path and the first end of the fourth refrigerant flow path. The second end of the fourth refrigerant flow path communicates with the gas make-up port of the compressor through the make-up gas pipeline.

10. The refrigerant system according to claim 9, wherein, the first end of the second throttling device communicates with the second end of the first heat exchange part, and the second end of the second throttling device communicates with the first end of the third refrigerant flow path.

11. The refrigerant system according to any one of claims 1 to 8, wherein, the first heat exchange part and the second heat exchange part are arranged adjacent to each other.

12. The refrigerant system according to claim 11, wherein, the first heat exchange part and the second heat exchange part are integrated into the same first heat exchanger.

13. The refrigerant system according to claim 12, wherein, the first heat exchanger is configured as a plate heat exchanger and is provided with a refrigerant flow path and a water flow path for heat exchange. The refrigerant flow path includes a first refrigerant flow path and a second refrigerant flow path. The water flow path includes a first water flow path corresponding to the first refrigerant flow path and a second water flow path corresponding to the second refrigerant flow path. The water flow path is provided with a water inlet, a first water outlet corresponding to the first water flow path, and a second water outlet corresponding to the second water flow path.

14. The refrigerant system according to claim 13, wherein, the water inlet communicates with the first water flow path and the second water flow path, and the pressures of the refrigerants flowing through the first refrigerant flow path and the second refrigerant flow path are configured to be different, so that the water outlet temperatures of the first water outlet and the second water outlet are different; or, the water inlet communicates with the first water flow path, and the first water flow path and the second water flow path are connected in series, so that the water outlet temperatures of the first water outlet and the second water outlet are different.

15. The refrigerant system according to claim 14, wherein, a flow valve is provided on the first water outlet and / or the second water outlet to adjust the water outlet flow rates of the first water outlet and the second water outlet.

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