Refrigerant system

Abstract

The refrigerant system comprises a compressor, a first heat exchanger, a second heat exchanger and a four-way reversing valve, the first heat exchanger and the second heat exchanger are communicated with the compressor, the first heat exchanger comprises a first heat exchange part and a second heat exchange part, the first end of the second heat exchange part is communicated with an exhaust port, and the compressor is provided with the exhaust port and an air return port. A first connector of the four-way reversing valve communicates with the first end of the first heat exchange part, a second connector of the four-way reversing valve communicates with the second end of the second heat exchanger, a third connector of the four-way reversing valve communicates with the exhaust port, and a fourth connector of the four-way reversing valve communicates with the air return port. The first end of the second heat exchanger communicates with the second end of the first heat exchange part and the second end of the second heat exchange part. According to the technical scheme, the refrigerant system can be defrosted under the condition that the compressor is not shut down, so that continuous heat supply is kept, and indoor comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a refrigerant system. Background Art

[0002] When the refrigerant system is heating under low temperature conditions, the outdoor heat exchanger is prone to ice and frost. After the outdoor heat exchanger is frosted, the heat exchange efficiency will drop sharply, seriously affecting the heat exchange effect. Therefore, when the refrigerant system operates in a low temperature environment for a period of time or when the outdoor heat exchanger is severely frosted, it will generally enter the defrost 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 heating mode to cooling mode for defrosting, that is, the compressor is shut down and the refrigerant circuit is reversed, resulting in discontinuous heating and significant fluctuations in indoor temperature, thereby affecting the comfort of use. Utility Model Content

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

[0005] To achieve the above-mentioned purpose, the refrigerant system proposed by the utility model comprises:

[0006] A compressor having an exhaust port and an air return port;

[0007] a first heat exchanger and a second heat exchanger in communication with the compressor, the first heat exchanger comprising a first heat exchange portion and a second heat exchange portion, a first end of the second heat exchange portion being in communication with the exhaust port; and

[0008] A four-way reversing valve, wherein the first interface of the four-way reversing valve is connected to the first end of the first heat exchange part, the second interface of the four-way reversing valve is connected to the second end of the second heat exchanger, the third interface of the four-way reversing valve is connected to the exhaust port, the fourth interface of the four-way reversing valve is connected to the return port, and the first end of the second heat exchanger is connected to the second end of the first heat exchange part and the second end of the second heat exchange part.

[0009] Optionally, the refrigerant system further includes a first throttling device, a first end of the first throttling device being connected to the second end of the first heat exchange part and the second end of the second heat exchange part, and a second end of the first throttling device being connected to the first end of the second heat exchanger.

[0010] Optionally, the exhaust port includes a first exhaust port and a second exhaust port, the first exhaust port is connected to a third interface of the four-way reversing valve, and the second exhaust port is connected to a first end of the second heat exchange part.

[0011] Optionally, the refrigerant system also includes a second throttling device, the first end of which is connected to the second end of the first heat exchange part and the second heat exchange part where the refrigerant pressure is larger in the first mode, and the second end of the second throttling device is connected to the first end of the first throttling device.

[0012] Optionally, the refrigerant pressure of the first exhaust port is higher than the refrigerant pressure of the second exhaust port, and the second end of the second heat exchange part is directly connected to the first end of the first throttling device.

[0013] Optionally, the refrigerant pressure of the first exhaust port is lower than the refrigerant pressure of the second exhaust port, and the refrigerant system further includes a fourth throttling device, and the second end of the second heat exchange part is connected to the first end of the first throttling device through the fourth throttling device.

[0014] Optionally, the exhaust port is configured as one, and the refrigerant system also includes a bypass pipe, the bypass pipe has two connected bypass outlets, the air inlet of the bypass pipe is connected to the exhaust port, one of the bypass outlets is connected to the third interface of the four-way reversing valve, and the other of the bypass outlets is connected to the first end of the second heat exchange part.

[0015] Optionally, the refrigerant system further comprises a second throttling device, a first end of the second throttling device is connected to the second end of the first heat exchange part, and a second end of the second throttling device is connected to the first end of the first throttling device.

[0016] Optionally, the refrigerant system also includes an economizer, an air supply 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 is connected to 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 connected to 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 connected to the air supply port of the compressor through the air supply pipeline.

[0017] Optionally, the first end of the second throttling device is connected to the second end of the first heat exchange part, and the second end of the second throttling device is connected to the first end of the third refrigerant flow path.

[0018] Optionally, the first heat exchange part and the second heat exchange part are arranged adjacent to each other, and the refrigerant system further includes an indoor fan, and the indoor fan is used to drive air to flow from the first heat exchange part to the second heat exchange part.

[0019] Optionally, the first heat exchange part and the second heat exchange part are integrated into a same first heat exchanger.

[0020] In the technical solution of the utility model, by setting a single four-way reversing valve, the refrigerant system can realize the defrosting of the second heat exchanger in the second mode without stopping the compressor and the first heat exchanger heating continuously, which not only provides continuous and stable heat supply to improve the comfort of use, but also reduces the risk of failure caused by frequent start and stop of major electrical components such as compressors, thereby improving the service life of the compressor and the refrigerant system. In addition, the compressor of the refrigerant system can realize the defrosting function without stopping by a single four-way reversing valve, which has a simple structure and is easy to implement, and can significantly reduce the production cost and maintenance cost of the refrigerant system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of a refrigerant circuit in a first mode of a first embodiment of a refrigerant system of the utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0024] Figure 3 It is a schematic diagram of a refrigerant circuit of a second embodiment of the refrigerant system of the utility model in a first mode;

[0025] Figure 4 for Figure 3 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0026] Figure 5 It is a schematic diagram of a refrigerant circuit of the third embodiment of the refrigerant system of the utility model in the first mode;

[0027] Figure 6 A schematic diagram of a refrigerant circuit in the first mode of the fourth embodiment of the refrigerant system of the utility model;

[0028] Figure 7 for Figure 6 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0029] Figure 8 A schematic diagram of a refrigerant circuit in the first mode of the fifth embodiment of the refrigerant system of the utility model;

[0030] Fig. 9 for Figure 8 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0031] Fig.10 A schematic diagram of a refrigerant circuit in the first mode of the sixth embodiment of the refrigerant system of the utility model;

[0032] Fig.11 for Fig.10 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0033] Fig.12 A schematic diagram of a refrigerant circuit in the first mode of the seventh embodiment of the refrigerant system of the utility model;

[0034] Fig.13 for Fig.12 A schematic diagram of a refrigerant circuit of the refrigerant system in the second mode is shown;

[0035] Fig.14 This is a structural schematic diagram of an embodiment of the first heat exchanger of the utility model;

[0036] Fig.15 It is a structural schematic diagram of another embodiment of the first heat exchanger of the utility model.

[0037] Description of Figure Numbers:

[0038]

[0039] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0044] The utility model proposes a refrigerant system, which includes but is not limited to air conditioners and heat pump equipment, among which the heat pump equipment includes but is not limited to ATW (Air-Water) heat pump equipment and ATA (Air-Air) heat pump equipment. Figures 1 to 13 , is a schematic diagram of a refrigerant circuit of different embodiments of the refrigerant system of the utility model in the first mode or the second mode, and the hollow arrows in the figure indicate the flow direction of air used for heat exchange with the first heat exchanger.

[0045] Please refer to Figures 1 to 13 In some embodiments of the utility model, the refrigerant system includes a compressor 20, a first heat exchanger 10 and a second heat exchanger 40 which are connected to 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 return air port 203. The exhaust port of the compressor is connected to 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 connected to 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 connected to the return air port 203.

[0046] In some embodiments, the refrigerant system also includes a control device 80, which can control the refrigerant system to switch between a first mode and a second mode. In the first mode, a portion of the refrigerant flowing out of the exhaust port passes through the first heat exchange part 10a and the second heat exchanger 40 in sequence and returns to the compressor 20, and another portion of the refrigerant flowing out of the exhaust port passes through the second heat exchange part 10b and the second heat exchanger 40 in sequence and returns to the compressor 20; in the second mode, a portion of the refrigerant flowing out of the exhaust port passes through the second heat exchanger 40 and the first heat exchange part 10a in sequence and returns to the compressor 20, and another portion of the refrigerant flowing out of the exhaust port passes through the second heat exchange part 10b and the first heat exchange part 10a in sequence and returns to the compressor 20.

[0047] 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, the first heat exchange part 10a and the second heat exchange part 10b both serve as condensers, and the second heat exchanger 40 serves as an evaporator to form a refrigerant heating circuit. 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 serve as a condenser, while 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 comfort of use, while the other part of the refrigerant is used to make the second heat exchanger 40 self-heating to melt the frost on its surface.

[0048] It should be noted that when the refrigerant system is configured as an air conditioner, the first heat exchanger is used to exchange heat with the air in the indoor space. It can be arranged as a whole in the indoor space or in the outdoor space, or it can be arranged in part in the indoor space and the other part in the outdoor space. That is, the present application does not make specific limitations on the layout position of the first heat exchanger; similarly, the present application does not make specific limitations on the layout position of the second heat exchanger.

[0049] In the technical solution of the utility model, through the control device 80, the refrigerant system can, in the second mode, realize defrosting of the second heat exchanger 40 without stopping the compressor 20 and the first heat exchanger continuously heating. Not only can the heat supply be continuous and stable to improve the comfort of use, but also the risk of failure caused by frequent start and stop of major electrical components such as the compressor 20 can be reduced, thereby prolonging the service life of the compressor 20 and the refrigerant system.

[0050] Please refer to Figure 1 and Figure 2In one 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 connected to the exhaust port, the E interface (i.e., the first interface) of the four-way reversing valve 81 is connected to the first end of the first heat exchange part 10a, the C interface (i.e., the second interface) of the four-way reversing valve 81 is connected to the second end of the second heat exchanger 40, the D interface (i.e., the third interface) of the four-way reversing valve 81 is connected to the exhaust port, the S interface (i.e., the fourth interface) of the four-way reversing valve 81 is connected to the return air port 203, and 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, the compressor 20 of the refrigerant system can realize the defrosting function without stopping through a single four-way reversing valve 81, the structure is simple and easy to implement, and the production cost and maintenance cost of the refrigerant system can be significantly reduced.

[0051] Specifically, in this embodiment, in the first mode, a 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, the first heat exchange part 10a and the second heat exchange part 10b are both used as condensers, and the second heat exchanger 40 is used as an evaporator to form a refrigerant heating circuit. 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, while the second heat exchange part 10b continues to be a condenser, and the first heat exchange part 10a is converted into an evaporator to form a new refrigerant heating circuit, so that a part of the refrigerant can be used to heat the indoor space, and the other part of the refrigerant is used to make the second heat exchanger 40 self-heated to melt the frost on its surface.

[0052] It is worth mentioning that when the refrigerant system is configured as an air conditioner or an ATA heat pump device, 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, so that the user can choose to open them according to needs. Specifically, the main purpose of using the second mode in the severe winter is to convert the second heat exchanger 40 into a condenser to remove the frost on the surface of the second heat exchanger 40, and the main purpose of using the dehumidification mode in the rainy 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.

[0053] Please refer to Figure 5In another embodiment, the control device 80 may 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 interface of the four-way reversing valve 81 is connected to the first end of the first heat exchange part 10a, the C interface of the four-way reversing valve 81 is connected to the second end of the second heat exchanger 40, the D interface of the four-way reversing valve 81 is connected to the exhaust port, the S interface of the four-way reversing valve 81 is connected to the return air port 203, and 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 connect the second heat exchange part 10b and the second exhaust port 202; when the refrigerant system enters the cooling 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, thereby preventing the second heat exchange part 10b from being converted into a condenser and affecting the cooling effect of the first heat exchange part 10a on the indoor air.

[0054] Of course, the control device 80 may 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 switching between the first mode and the second mode, and this application does not make specific limitations here.

[0055] 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 interface 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 refrigerants of different pressures and flows into the four-way reversing valve and the second heat exchange part.

[0056] Of course, please refer to Figures 10 to 13 In other embodiments, the exhaust port may be configured as one, and the refrigerant system further includes a shunt pipe 92, the shunt pipe 92 has two connected shunt outlets 921, the air inlet of the shunt pipe 92 is connected to the exhaust port, one shunt outlet 921 is connected to the D interface of the four-way reversing valve 81, and the other shunt outlet 921 is connected to 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.

[0057] Please refer to Figures 1 to 13In some embodiments, the refrigerant system further includes a first throttling device 30, a first end of the first throttling device 30 is connected to 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 connected to 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 merge and 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 shown in FIG. Figure 1 , Figure 6 or Fig.10 As 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 merges with the refrigerant flowing out of the first heat exchange part 10b, and then flows to the first heat exchange part 10a together, and finally returns to the compressor 20 through the return air port of the compressor 20, as shown in FIG. Figure 2 , Figure 7 or Fig.11 As 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 at the same time in the first mode, which is beneficial to improve the heat exchange efficiency of the refrigerant in the second heat exchanger 40.

[0058] Of course, in other embodiments, the first end of the first throttling device 30 may be connected to the second end of the first heat exchange part 10a, and the second end of the first throttling device 30 may be connected to 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 connected to the first end of the second heat exchanger 40; or the first end of the first throttling device 30 may be connected to the second end of the first heat exchange part 10b, and the second end of the first throttling device 30 may be connected to 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 connected to the first end of the second heat exchanger 40. Of course, the first throttling device 30 may not be provided.

[0059] Please refer to Figures 1 to 9In the embodiment where the exhaust port includes the first exhaust port 201 and the second exhaust port 202, optionally, the refrigerant pressure of the first exhaust port 201 and the second exhaust port 202 are configured to be different, and the refrigerant system further includes a second throttling device 51, 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 heat exchange part 10b, which has a larger refrigerant pressure in the first mode, and the second end of the second throttling device 51 is connected to the first end of the first throttling device 30. In this way, 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 conducive to the refrigerant in the refrigerant flow path and the refrigerant in another refrigerant flow path. Convergence downstream. Of course, in other embodiments, the second throttling device 51 may not be provided, and only the first throttling device 30 may be provided.

[0060] For more information, please refer to Figures 1 to 4 In some embodiments, the refrigerant pressure of the first exhaust port 201 is higher than the refrigerant pressure of the second exhaust port 202, which is called the medium-pressure normal 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 other embodiments, the refrigerant pressure of the first exhaust port 201 is lower than the refrigerant pressure of the second exhaust port 202, and the high-pressure operation scheme is adopted. 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 be equal to the refrigerant pressure of the second exhaust port 202.

[0061] Please refer to Figures 1 to 4 In the embodiment of medium pressure normal operation, optionally, the second end of the second heat exchange part 10b is directly connected to the first end of the first throttling device 30, so that 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 merged refrigerant in the second mode, which is conducive to improving the heat exchange efficiency of the refrigerant entering the first heat exchange part.

[0062] For details, 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 passes through the throttling effect of the second throttling device 51 and reduces the pressure, and then merges with the refrigerant flowing out from the second end of the second heat exchange part, and flows into the first end of the first throttling device 30 together. Figure 2 and Figure 4 In the second mode, the refrigerant flowing out from the first end of the second heat exchanger 40 first passes through the throttling effect of the first throttling device 30 and reduces the pressure, and then merges with the refrigerant flowing out from the second end of the second heat exchange part, and flows into the second end of the second throttling device 51 together.

[0063] It can be understood that in this embodiment, by arranging 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 higher pressure in both the first mode and the second mode, and the structure is simple and easy to implement.

[0064] Please refer to Figures 6 to 9 In the embodiment of high pressure normal operation, 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, the fourth throttling device 52 is controlled to be in a fully open state to reduce its throttling and pressure reduction effect on the refrigerant, and the second throttling device 51 is in a throttling state (i.e., between fully open and fully closed) to perform normal throttling and pressure reduction on the refrigerant, so that the pressure of the refrigerant flowing out of the second throttling device 51 and the fourth throttling device 52 can be closer to facilitate their confluence. In the second mode, the second throttling device 51 and the fourth throttling device 52 are both in a throttling state to perform throttling and pressure reduction on the refrigerant twice in succession. Of course, in other embodiments, the fourth throttling device may not be provided.

[0065] Please refer to Figures 10 to 13 In the embodiment where the exhaust port is configured as one, a second throttling device 51 is optionally 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 refrigerant pressures flowing out of the two branch outlets 921 are the same, please refer to Fig.10 In the first mode, the second throttling device 51 is controlled to be in a fully open state, so that the pressure of the refrigerant flowing out of the second throttling device 51 and the second heat exchange part 10b is closer to each other to facilitate their confluence. Fig.11 In the second mode, the second throttling device 51 is controlled to switch to the throttling state, and the second throttling device 51 can perform secondary throttling and pressure reduction on the refrigerant after confluence. Of course, in other embodiments where the exhaust port is configured as one, the second throttling device may not be provided.

[0066] It can be understood that in the embodiment where the exhaust port is configured as one, by adjusting the opening of the second throttling device 51, the refrigerant flow rate flowing out of the two branch outlets 921 can also be adjusted, thereby achieving the adjustment of the refrigerant flow rate 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.

[0067] Please refer to Figure 3 , Figure 4 , Figure 8 , Fig. 9 , Fig.12 , Fig.13 In other embodiments, the refrigerant system further includes an economizer 61, an air supply pipeline 62 and a third throttling device 63. The economizer 61 is provided with a third refrigerant flow path 611 and a fourth refrigerant flow path 612 for heat exchange. The first end of the third refrigerant flow path 611 is connected to the second end of the first heat exchange part 10a and the second end of the second heat exchange part 10b. The first end of the second heat exchanger 40 is connected to 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 connected to the air supply port 204 of the compressor 20 through the air supply pipeline 62. In this way, by adding the economizer 61, the air supply pipeline 62 and the third throttling device 63, the effect of air supply and enthalpy increase can be achieved, so as to improve the operating efficiency of the refrigerant system and reduce energy consumption.

[0068] Please refer to Figure 3 and Figure 4 In some embodiments, optionally, 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 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 passes through the throttling effect of the second throttling device 51 and reduces the pressure, then merges with the refrigerant flowing out from the second end of the second heat exchange part, and flows 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 passes through the throttling effect of the first throttling device 30 and reduces the pressure, then flows through the third refrigerant flow path 611 and merges with the refrigerant flowing out from the second end of the second heat exchange part, and flows into the second end of the first heat exchange part 10a together.

[0069] In some embodiments, the first heat exchange part 10a and the second heat exchange part 10b are arranged adjacent to each other. In this way, when the refrigerant system is in the second mode, the first heat exchange part 10a and the second heat exchange part 10b can first exchange heat with each other to reduce the cooling effect of the first heat exchange part 10a as an 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 can also be arranged away from each other.

[0070] Please refer to Figure 2 , Fig.14 and Fig.15In some embodiments, the refrigerant system further includes an indoor fan 91, and the indoor fan 91 is used to drive air 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 as an evaporator to be cooled and dehumidified, and then flows through the second heat exchange part 10b as a condenser to be heated, thereby providing dry and warm air for the indoor space. Of course, in other embodiments, the indoor fan 91 can also be used to drive air from the second indoor heat exchange part 10b to the first heat exchange part 10a.

[0071] 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, in other embodiments, the first heat exchange part 10a and the second heat exchange part 10b can also be configured as two independent first heat exchangers 10.

[0072] Specifically, the first heat exchanger 10 has various structural forms, for example, please refer to Fig.14 or Fig.15 In the embodiment with an indoor fan, the first heat exchanger 10 is only provided with a refrigerant flow path, that is, the first heat exchange part 10a and the second heat exchange part 10b are both provided with a refrigerant flow path, and the indoor fan drives the air to flow through the outer surface of the refrigerant flow path and perform heat exchange. Optionally in this embodiment, the first heat exchanger 10 can be a fin-tube heat exchanger, a coil heat exchanger, or a microchannel flat tube heat exchanger, etc., which is not specifically limited in this application. Of course, the first heat exchanger 10 can also be other structural forms, such as a plate heat exchanger.

[0073] In one embodiment, the refrigerant system further includes a gas-liquid separator, and the gas-liquid separator is connected to the second end of the second heat exchanger 40 and the return air port of the compressor 20. In this way, the problem of refrigerant liquid hammer can be avoided. Of course, in other embodiments, the gas-liquid separator may not be provided.

[0074] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A refrigerant system, characterized in that: include: A compressor having an exhaust port and an air return port; a first heat exchanger and a second heat exchanger in communication with the compressor, the first heat exchanger comprising a first heat exchange portion and a second heat exchange portion, a first end of the second heat exchange portion being in communication with the exhaust port; and A four-way reversing valve, wherein the first interface of the four-way reversing valve is connected to the first end of the first heat exchange part, the second interface of the four-way reversing valve is connected to the second end of the second heat exchanger, the third interface of the four-way reversing valve is connected to the exhaust port, the fourth interface of the four-way reversing valve is connected to the return port, and the first end of the second heat exchanger is connected to the second end of the first heat exchange part and the second end of the second heat exchange part.

2. The refrigerant system according to claim 1, characterized in that The refrigerant system further includes a first throttling device, a first end of the first throttling device is connected to the second end of the first heat exchange part and the second end of the second heat exchange part, and a second end of the first throttling device is connected to the first end of the second heat exchanger.

3. The refrigerant system according to claim 2, characterized in that The exhaust port includes a first exhaust port and a second exhaust port, the first exhaust port is connected to the third interface of the four-way reversing valve, and the second exhaust port is connected to the first end of the second heat exchange part.

4. The refrigerant system according to claim 3, characterized in that The refrigerant system also includes a second throttling device, a first end of which is connected to the second end of the first heat exchange part and the second heat exchange part where the refrigerant pressure is larger in the first mode, and a second end of the second throttling device is connected to the first end of the first throttling device.

5. The refrigerant system according to claim 4, characterized in that The refrigerant pressure of the first exhaust port is higher than the refrigerant pressure of the second exhaust port, and the second end of the second heat exchange part is directly connected to the first end of the first throttling device; Alternatively, the refrigerant pressure of the first exhaust port is lower than the refrigerant pressure of the second exhaust port, and the refrigerant system further includes a fourth throttling device, and the second end of the second heat exchange part is connected to the first end of the first throttling device through the fourth throttling device.

6. The refrigerant system according to claim 2, wherein: The exhaust port is configured as one, and the refrigerant system also includes a diverter pipeline, which has two connected diverter outlets. The air inlet of the diverter pipeline is connected to the exhaust port, one of the diverter outlets is connected to the third interface of the four-way reversing valve, and the other diverter outlet is connected to the first end of the second heat exchange part.

7. The refrigerant system according to claim 6, characterized in that The refrigerant system further includes a second throttling device, a first end of the second throttling device is connected to the second end of the first heat exchange part, and a second end of the second throttling device is connected to the first end of the first throttling device.

8. The refrigerant system according to claim 4 or 7, characterized in that: The refrigerant system also includes an economizer, an air supply 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 is connected to 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 connected to 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 connected to the air supply port of the compressor through the air supply pipeline.

9. The refrigerant system according to claim 8, characterized in that The first end of the second throttling device is connected to the second end of the first heat exchange part, and the second end of the second throttling device is connected to the first end of the third refrigerant flow path.

10. The refrigerant system according to claim 1, wherein: The first heat exchange part and the second heat exchange part are arranged adjacent to each other, or the first heat exchange part and the second heat exchange part are integrated into the same first heat exchanger; And / or, the refrigerant system further includes an indoor fan, and the indoor fan is used to drive air to flow from the first heat exchange part to the second heat exchange part.

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