Air conditioning system with double four-way valves and air conditioner

Abstract

The embodiment of the utility model relates to a double-four-way-valve air conditioning system and an air conditioner. The system comprises a first four-way valve, a second four-way valve, an enthalpy spraying compressor, an outdoor heat exchanger, a heat storage device, an indoor heat exchanger and an enthalpy spraying branch. Wherein the first four-way valve is used for controlling refrigerant flowing between the compressor and the indoor heat exchanger, the second four-way valve is used for controlling refrigerant flowing among the compressor, the outdoor heat exchanger and the heat storage device, and the enthalpy spraying branch is arranged, so that the enthalpy spraying function and the continuous heating function can be realized in the air conditioner, and the heat exchange efficiency of the air conditioner is improved. In the continuous heating process, heat does not need to be obtained from the indoor side for heat storage and defrosting, only one part of the high-temperature and high-pressure refrigerant needs to be used for indoor heating, and the other part of the high-temperature and high-pressure refrigerant is used for heat storage or defrosting, so that the heat attenuation rate in the low-temperature heating process is reduced, and the influence on indoor heating is reduced in the defrosting operation process.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to a dual four-way valve air conditioning system and an air conditioner. Background Art

[0002] Currently, with the improvement of people's living standards, the requirements for the comfort of air conditioners are also getting higher and higher. In the existing air conditioner in the heating mode, the outdoor unit is likely to frost as an evaporator, and during the defrosting process, the indoor unit is converted into an evaporator and the outdoor unit is converted into a condenser, absorbing heat from the indoor for defrosting of the outdoor unit, resulting in a deterioration of the heating effect of the indoor unit and affecting the user's heating demand. Summary of the Utility Model

[0003] In view of this, to solve the above-mentioned partial or all technical problems, embodiments of this application provide a dual four-way valve air conditioning system and an air conditioner.

[0004] In a first aspect, embodiments of this application provide a dual four-way valve air conditioning system, which includes: a first four-way valve, a second four-way valve, an ejector compressor, an outdoor heat exchanger, a heat storage device, an indoor heat exchanger, and an ejector branch; the interface D of the first four-way valve is connected to the refrigerant outlet of the ejector compressor through a refrigerant outflow pipeline, the interface C of the first four-way valve is connected to the interface S of the first four-way valve through a capillary tube, the interface S of the first four-way valve is connected to the refrigerant inlet of the ejector compressor through a refrigerant inflow pipeline, and the interface E of the first four-way valve is connected to the indoor heat exchanger; the interface D of the second four-way valve is connected to the refrigerant outlet of the ejector compressor through a refrigerant outflow pipeline, the interface C of the second four-way valve is connected to the first end of the outdoor heat exchanger, the interface S of the second four-way valve is connected to the refrigerant inlet of the ejector compressor through a refrigerant inflow pipeline, and the interface E of the second four-way valve is connected to the first end of the heat storage device; the second end of the heat storage device is connected to the refrigerant inlet of the ejector compressor through a refrigerant inflow pipeline; the second end of the outdoor heat exchanger is connected to the indoor heat exchanger; the first end of the ejector branch is connected to the refrigerant inflow pipeline, and the second end of the ejector branch is connected to the ejector inlet of the ejector compressor.

[0005] In a possible implementation, the ejector branch includes an ejector electronic expansion valve, and the ejector electronic expansion valve is arranged on the pipeline of the ejector branch.

[0006] In a possible implementation, the system further includes a subcooler; the second end of the outdoor heat exchanger and the second end of the heat storage device are connected to the refrigerant inflow pipeline through the subcooler, and the outdoor heat exchanger and the heat storage device are connected to the indoor heat exchanger through the subcooler.

[0007] In a possible implementation, the system further includes a subcooler solenoid valve; the subcooler solenoid valve is arranged on the refrigerant inflow pipeline, and the first end of the ejector branch is arranged between the subcooler solenoid valve and the subcooler.

[0008] In a possible implementation, the system further includes an oil-gas separator, which is disposed on the refrigerant outflow pipeline.

[0009] In a possible implementation, the system further includes a gas-liquid separator, which is disposed on the refrigerant inflow pipeline.

[0010] In a possible implementation, the system further includes a subcooler electronic expansion valve. One end of the subcooler electronic expansion valve is connected to the subcooler, and the other end is connected to the outdoor heat exchanger and the heat storage device.

[0011] In a possible implementation, the system further includes an outdoor heat exchange electronic expansion valve and a heat storage electronic expansion valve. The outdoor heat exchange electronic expansion valve is disposed between the outdoor heat exchanger and the subcooler, and the heat storage electronic expansion valve is disposed between the heat storage device and the subcooler.

[0012] In a possible implementation, the system further includes a first filter, a second filter, a third filter, and a fourth filter. The first filter is disposed on the pipeline between the subcooler and the indoor heat exchanger, the second filter is disposed on the pipeline between the outdoor heat exchanger and the subcooler, the third filter is disposed on the pipeline between the heat storage device and the subcooler, and the fourth filter is disposed on the pipeline between the interface E of the first four-way valve and the indoor heat exchanger.

[0013] In a second aspect, an embodiment of the present application provides an air conditioner, which includes a controller and the dual four-way valve air conditioner system described in any embodiment of the first aspect above. The controller is connected to the first four-way valve and the second four-way valve included in the dual four-way valve air conditioner system, and the controller is configured to control the connection state of the first four-way valve and the second four-way valve according to the current working mode.

[0014] The dual four-way valve air conditioner system and the air conditioner provided by the embodiments of the present application, by providing two four-way valves in the air conditioner system, one of the four-way valves is used to control the refrigerant flow between the compressor and the indoor heat exchanger, and the other four-way valve is used to control the refrigerant flow between the compressor, the outdoor heat exchanger, and the heat storage device, and a flash injection branch is provided, so as to realize both the flash injection function and the continuous heating function in the air conditioner. During continuous heating, there is no need to obtain heat from the indoor side for heat storage and defrosting. Only a part of the high-temperature and high-pressure refrigerant is used for indoor heating, and the other part is used for heat storage or defrosting, thereby reducing the heat attenuation rate during low-temperature heating, and reducing the impact on indoor heating during the defrosting operation. Description of the Drawings

[0015] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0018] Figure 1 Structural schematic diagram of a double four-way valve air conditioning system provided by an embodiment of the present application;

[0019] Figure 2 Structural schematic diagram of another double four-way valve air conditioning system provided by an embodiment of the present application;

[0020] Figure 3 Schematic diagram of the refrigeration operation principle provided by an embodiment of the present application;

[0021] Figure 4 Schematic diagram of the heating and heat storage operation principle provided by an embodiment of the present application;

[0022] Figure 5 Schematic diagram of the defrosting operation principle provided by an embodiment of the present application;

[0023] Figure 6 Schematic diagram of the continuous heating operation principle provided by an embodiment of the present application;

[0024] Figure 7 Structural schematic diagram of an air conditioner provided by an embodiment of the present application.

[0025] Reference numerals:

[0026] 100 - Double four-way valve air conditioning system; 101 - First four-way valve; 102 - Second four-way valve; 103 - Injection enthalpy compressor; 104 - Outdoor heat exchanger; 105 - Heat storage device; 106 - Indoor heat exchanger; 107 - Injection enthalpy branch; 108 - Refrigerant outflow pipeline; 109 - Refrigerant inflow pipeline; 110 - Injection enthalpy electronic expansion valve; 111 - Subcooler; 112 - Subcooler solenoid valve; 113 - Oil and gas separator; 114 - Gas-liquid separator; 115 - Subcooler electronic expansion valve; 116 - Outdoor heat exchange electronic expansion valve; 117 - Heat storage electronic expansion valve; 118 - First filter; 119 - Second filter; 120 - Third filter; 121 - Fourth filter; 700 - Air conditioner; 701 - Controller. Detailed implementation manners

[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present application.

[0028] Those skilled in the art can understand that terms such as "first", "second", etc. in the embodiments of the present application are only used to distinguish different steps, devices or modules, etc., and do not represent any specific technical meaning, nor do they represent the logical order between them.

[0029] It should also be understood that in this embodiment, "a plurality of" may refer to two or more, and "at least one" may refer to one, two or more.

[0030] It should also be understood that for any component, data or structure mentioned in the embodiments of the present application, without clear definition or contrary indication in the context, it can generally be understood as one or more.

[0031] In addition, the term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0032] It should also be understood that the present application emphasizes the differences between various embodiments, and their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated one by one.

[0033] The following description of at least one exemplary embodiment is actually merely illustrative and in no way restricts the present application or its application or use.

[0034] Technologies, circuits and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the above technologies, circuits and devices should be regarded as part of the specification.

[0035] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. For the convenience of understanding the embodiments of the present application, the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0037] Figure 1 FIG. 4 is a schematic structural diagram of a dual four-way valve air-conditioning system provided by an embodiment of the present application. The system specifically includes: a first four-way valve 101, a second four-way valve 102, an injection enthalpy compressor 103, an outdoor heat exchanger 104, a heat storage device 105, an indoor heat exchanger 106, and an injection enthalpy branch 107.

[0038] Among them, both the first four-way valve 101 and the second four-way valve 102 include four interfaces, namely interface D, interface C, interface S, and interface E. The above-mentioned injection enthalpy compressor 103 can also be called a variable-frequency jet injection enthalpy compressor. It compresses and jets and mixes for cooling while the refrigerant is in the medium and low pressure, and compresses normally when in high pressure, improving the compressor displacement and achieving the purpose of enhancing the heating capacity in a low-temperature environment. The above-mentioned heat storage device 105 is used to store a certain amount of heat and provide a certain heat source for indoor heating and defrosting of the outdoor unit.

[0039] In this embodiment, as Figure 1 shown, the interface D of the first four-way valve 101 is connected to the refrigerant outlet of the injection enthalpy compressor 103 through a refrigerant outflow pipeline 108. The interface C of the first four-way valve 101 is connected to the interface S of the first four-way valve 101 through a capillary tube. The interface S of the first four-way valve 101 is connected to the refrigerant inlet of the injection enthalpy compressor 103 through a refrigerant inflow pipeline 109. The interface E of the first four-way valve 101 is connected to the indoor heat exchanger 106.

[0040] The interface D of the second four-way valve 102 is connected to the refrigerant outlet of the injection enthalpy compressor 103 through a refrigerant outflow pipeline 108. The interface C of the second four-way valve 102 is connected to the first end of the outdoor heat exchanger 104 (i.e., the right end of the outdoor heat exchanger 104 in the figure). The interface S of the second four-way valve 102 is connected to the refrigerant inlet of the injection enthalpy compressor 103 through a refrigerant inflow pipeline 109. The interface E of the second four-way valve 102 is connected to the first end of the heat storage device 105 (i.e., the right end of the heat storage device 105 in the figure). The second end of the heat storage device 105 (i.e., the left end of the heat storage device 105 in the figure) is connected to the refrigerant inlet of the injection enthalpy compressor 103 through a refrigerant inflow pipeline 109.

[0041] In this embodiment, the second end of the outdoor heat exchanger 104 (i.e., the left end of the outdoor heat exchanger 104 in the figure) is connected to the indoor heat exchanger 106.

[0042] The first end of the enthalpy injection branch 107 is connected to the refrigerant inflow pipeline 109, and the second end of the enthalpy injection branch 107 is connected to the enthalpy injection inlet of the enthalpy injection compressor 103.

[0043] The first four-way valve 101 and the second four-way valve 102 in this embodiment can adjust the on-off relationship of the four interfaces according to the current working mode of the air-conditioning system, so as to realize the circulating flow of the refrigerant among the enthalpy injection compressor 103, the outdoor heat exchanger 104, the indoor heat exchanger 106 and the heat storage device 105.

[0044] The dual four-way valve air-conditioning system provided by the embodiment of the present application realizes the enthalpy injection function and the continuous heating function in the air conditioner by setting two four-way valves in the air-conditioning system, where one four-way valve is used to control the refrigerant flow between the compressor and the indoor heat exchanger, and the other four-way valve is used to control the refrigerant flow between the compressor and the outdoor heat exchanger and the heat storage device, and an enthalpy injection branch is set. When continuously heating, there is no need to obtain heat from the indoor side for heat storage and defrosting. Only a part of the high-temperature and high-pressure refrigerant is used for indoor heating, and the other part is used for heat storage or defrosting, thereby reducing the heat attenuation rate during low-temperature heating, and reducing the impact on indoor heating during the defrosting operation.

[0045] In some optional implementation manners of this embodiment, such as Figure 2 shown, the enthalpy injection branch 107 includes an enthalpy injection electronic expansion valve 110, and the enthalpy injection electronic expansion valve 110 is arranged on the pipeline of the enthalpy injection branch 107.

[0046] The enthalpy injection electronic expansion valve 110 is used to adjust the refrigerant flow rate in the refrigerant inflow pipeline 109 to effectively control the enthalpy injection operation, thereby helping to improve the heating or cooling effect.

[0047] In some optional implementation manners of this embodiment, such as Figure 2 shown, the system further includes a subcooler 111, and the subcooler 111 is used to cool down the high-temperature refrigerant in the refrigerant pipeline.

[0048] The second end of the outdoor heat exchanger 104 and the second end of the heat storage device 105 are connected to the refrigerant inflow pipeline 109 through the subcooler 111, and the outdoor heat exchanger 104 and the heat storage device 105 are connected to the indoor heat exchanger 106 through the subcooler 111.

[0049] Such as Figure 2As shown, the heat storage device 105 and the outdoor heat exchanger 104 are both connected to the subcooler 111. One end of the subcooler 111 is connected to the refrigerant inlet pipeline 109, and the other end is connected to the indoor heat exchanger 106 through a pipeline.

[0050] In this embodiment, by setting the subcooler 111, the refrigerant can be effectively cooled, improving the refrigeration and heating performance of the air conditioning system.

[0051] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes a subcooler solenoid valve 112.

[0052] The subcooler solenoid valve 112 is arranged on the refrigerant inlet pipeline 109, and the first end of the injection enthalpy branch 107 is arranged between the subcooler solenoid valve 112 and the subcooler 111.

[0053] The subcooler solenoid valve 112 can be closed when the injection enthalpy compressor 103 performs the injection enthalpy operation, so that the refrigerant all flows into the injection enthalpy branch 107 to increase the refrigerant flow rate, thereby improving the heating or refrigeration effect.

[0054] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes an oil-gas separator 113, and the oil-gas separator 113 is arranged on the refrigerant outlet pipeline 108.

[0055] By setting the oil-gas separator 113 in this embodiment, a small amount of oil droplets in the gaseous refrigerant flowing out of the injection enthalpy compressor 103 can be separated, reducing the influence of the oil droplets on heating and refrigeration, and thereby improving the overall heating and refrigeration performance of the air conditioning system.

[0056] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes a gas-liquid separator 114, and the gas-liquid separator 114 is arranged on the refrigerant inlet pipeline 109.

[0057] By arranging the gas-liquid separator 114 on the refrigerant inlet pipeline 109, the gas and liquid in the cooled refrigerant can be separated, preventing liquid particles from entering the compressor and improving the performance of the compressor.

[0058] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes a subcooler electronic expansion valve 115. One end of the subcooler electronic expansion valve 115 is connected to the subcooler 111, and the other end is connected to the outdoor heat exchanger 104 and the heat storage device 105.

[0059] By setting the subcooler electronic expansion valve, the refrigerant flow rate entering the subcooler 111 can be adjusted, which helps to effectively control the cooling effect of the subcooler 111 and improve the overall refrigeration and heating performance of the air conditioning system.

[0060] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes an outdoor heat exchange electronic expansion valve 116 and a heat storage electronic expansion valve 117.

[0061] The outdoor heat exchange electronic expansion valve 116 is arranged between the outdoor heat exchanger 104 and the subcooler 111, and the heat storage electronic expansion valve 117 is arranged between the heat storage device 105 and the subcooler 111.

[0062] By arranging the outdoor heat exchange electronic expansion valve 116 and the heat storage electronic expansion valve 117, the flow rate of the refrigerant flowing through the outdoor heat exchanger 104 and the heat storage device 105 can be adjusted, the accuracy of the temperature control of the air-conditioning system can be improved, and the refrigeration and heating performances of the air-conditioning system can be improved.

[0063] In some alternative implementation manners of this embodiment, as Figure 2 shown, the system further includes a first filter 118, a second filter 119, a third filter 120 and a fourth filter 121.

[0064] The first filter 118 is arranged on the pipeline between the subcooler 111 and the indoor heat exchanger 106, the second filter 119 is arranged on the pipeline between the outdoor heat exchanger 104 and the subcooler 111, the third filter 120 is arranged on the pipeline between the heat storage device 105 and the subcooler 111, and the fourth filter 121 is arranged on the pipeline between the interface E of the first four-way valve 101 and the indoor heat exchanger 106.

[0065] By arranging the filters, the refrigerant in the pipeline can be filtered to prevent impurities in the refrigerant from affecting the temperature control effect and improve the refrigeration and heating performances of the air-conditioning system.

[0066] Based on the above embodiments, the operation principles of the system in various working modes will be described below. Among them, the working modes of the air-conditioning system may include a refrigeration mode, a heat storage mode, a defrosting mode, a continuous heating mode, etc.

[0067] First, the refrigeration operation principle:

[0068] The connection relationship of the four interfaces of the first four-way valve 101 and the second four-way valve 102 is as Figure 3As shown in the figure. After the refrigerant is compressed by the ejector-enthalpy compressor 103, it successively passes through the oil-gas separator 113 and the second four-way valve 102, is cooled in the outdoor heat exchanger 104, and then is divided into two branches. One branch passes through the subcooler electronic expansion valve 115, and after throttling, the refrigerant in this branch is cooled by the subcooler 111. The evaporated refrigerant gas returns to the gas-liquid separator 114 or enters the ejector-enthalpy port of the ejector-enthalpy compressor 103 through the ejector-enthalpy branch 107 for ejector-enthalpy. The refrigerant in the other branch is cooled and then enters the indoor heat exchanger 106 for throttling and evaporation, and then returns to the gas-liquid separator 114 through the gas pipe and the first four-way valve 101, and finally returns to the ejector-enthalpy compressor 103. In the refrigeration mode, there is no need to store heat in the heat storage device 105. Therefore, the heat storage electronic expansion valve 117 can be closed.

[0069] Second, the operating principle of heating with heat storage:

[0070] The connection relationship of the four interfaces of the first four-way valve 101 and the second four-way valve 102 is as Figure 4 shown. After the refrigerant is compressed by the compressor, it is divided into two parts by the oil-gas separator 113: the first high-temperature gas passes through the second four-way valve 102 and flows into the heat storage device 105 for heat storage. After heat storage, it passes through the heat storage electronic expansion valve 117 and flows into the subcooler 111 and then converges with the refrigerant inflow pipeline 109. The second high-temperature gas passes through the first four-way valve 101 and flows into the indoor heat exchanger 106 for heating. The cooled refrigerant passes through the liquid pipe, flows into the subcooler 111 and then converges with the heat storage device 105. After throttling by the outdoor heat exchange electronic expansion valve 116, it evaporates and absorbs heat in the outdoor heat exchanger 104. The low-temperature and low-pressure refrigerant passes through the first four-way valve 101, returns to the gas-liquid separator 114, and finally returns to the ejector-enthalpy compressor 103.

[0071] Third, the defrosting operating principle:

[0072] The connection relationship of the four interfaces of the first four-way valve 101 and the second four-way valve 102 is as Figure 5 shown. After the refrigerant is compressed by the compressor, it successively passes through the oil-gas separator 113 and the second four-way valve 102. The high-temperature and high-pressure refrigerant exchanges heat and defrosts in the outdoor heat exchanger 104. After the cooled refrigerant passes through the outdoor heat exchange electronic expansion valve 116, it then passes through the subcooler 111 and enters the indoor heat exchanger 106 for throttling and evaporation, and then returns to the gas-liquid separator 114 through the gas pipe and the first four-way valve 101, and finally returns to the ejector-enthalpy compressor 103.

[0073] Fourth, the operating principle of continuous heating:

[0074] The connection relationship of the four interfaces of the first four-way valve 101 and the second four-way valve 102 is as Figure 6As shown in the figure, after the refrigerant is compressed by the compressor, it is divided into two parts by the oil-gas separator 113: the first part of the high-temperature gas passes through the second four-way valve 102 and flows into the outdoor heat exchanger 104 for defrosting. The cooled refrigerant passes through the outdoor heat exchange electronic expansion valve 116 and flows into the subcooler 111, where it converges with the refrigerant inflow pipeline 109. The second part of the high-temperature gas passes through the first four-way valve 101 and flows into the indoor unit for heating. The cooled refrigerant passes through the liquid pipe and flows into the subcooler 111, where it converges with the defrosting branch of the outdoor heat exchanger 104. Then, it passes through the heat storage electronic expansion valve 117 for throttling and pressure reduction, absorbs heat in the heat storage device 105, and the low-temperature and low-pressure refrigerant then passes through the second four-way valve 102 and flows into the gas-liquid separator 114, and finally returns to the injection enthalpy compressor 103.

[0075] Figure 7 A schematic structural diagram of an air conditioner provided by an embodiment of the present application is shown in Figure 7 As shown, the air conditioner 700 includes a controller 701 and the dual four-way valve air conditioner system 100 described in any of the above embodiments. The controller 701 is connected to the first four-way valve 101 and the second four-way valve 102 included in the dual four-way valve air conditioner system 100, and is used to control the connection state of the first four-way valve 101 and the second four-way valve 102 according to the current working mode. Among them, the working mode may include a refrigeration mode, a heat storage mode, a defrosting mode, a continuous heating mode, etc. For different working modes, the connection states of the first four-way valve 101 and the second four-way valve 102 are different, and specific reference may be made to the content described in the above Figures 3 - 6 corresponding embodiments.

[0076] It should be understood that Figure 7 the structural diagram shown only shows the connection relationship when the controller controls the two four-way valves, and does not constitute a limitation on other functions of the controller. The controller 701 can also be connected to other components in the system to control the operation of other components. For example, the controller 701 can also be connected to various electronic expansion valves, temperature sensors and other components.

[0077] The air conditioner provided by the embodiment of the present application, by setting the dual four-way valve air conditioner system and controlling the two four-way valves in the system by the controller, realizes both the injection enthalpy function and the continuous heating function in the air conditioner. During continuous heating, there is no need to obtain heat from the indoor side for heat storage and defrosting. Only a part of the high-temperature and high-pressure refrigerant is used for indoor heating, and the other part is used for heat storage or defrosting, thereby reducing the heat attenuation rate during low-temperature heating, and reducing the impact on indoor heating during the defrosting operation.

[0078] Those skilled in the art should further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different circuits to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0079] The steps of the circuits or algorithms described in combination with the embodiments disclosed herein can be implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0080] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The steps, processes, and operations described herein are not to be construed as necessarily requiring them to be executed in the particular order described or illustrated, unless the order of execution is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0081] The above description is only the specific implementation manners of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A dual four-way valve air conditioning system, characterized in that The system includes: a first four-way valve, a second four-way valve, an injection enthalpy compressor, an outdoor heat exchanger, a heat storage device, an indoor heat exchanger, and an injection enthalpy branch; The interface D of the first four-way valve is connected to the refrigerant outlet of the injection enthalpy compressor through a refrigerant outflow pipeline. The interface C of the first four-way valve is connected to the interface S of the first four-way valve through a capillary tube. The interface S of the first four-way valve is connected to the refrigerant inlet of the injection enthalpy compressor through a refrigerant inflow pipeline. The interface E of the first four-way valve is connected to the indoor heat exchanger; The interface D of the second four-way valve is connected to the refrigerant outlet of the injection enthalpy compressor through the refrigerant outflow pipeline. The interface C of the second four-way valve is connected to the first end of the outdoor heat exchanger. The interface S of the second four-way valve is connected to the refrigerant inlet of the injection enthalpy compressor through the refrigerant inflow pipeline. The interface E of the second four-way valve is connected to the first end of the heat storage device; The second end of the heat storage device is connected to the refrigerant inlet of the injection enthalpy compressor through the refrigerant inflow pipeline; The second end of the outdoor heat exchanger is connected to the indoor heat exchanger; The first end of the injection enthalpy branch is connected to the refrigerant inflow pipeline, and the second end of the injection enthalpy branch is connected to the injection enthalpy inlet of the injection enthalpy compressor.

2. The system according to claim 1, wherein The injection enthalpy branch includes an injection enthalpy electronic expansion valve, and the injection enthalpy electronic expansion valve is arranged on the pipeline of the injection enthalpy branch.

3. The system according to claim 1, characterized in that, The system further includes a subcooler; The second end of the outdoor heat exchanger and the second end of the heat storage device are connected to the refrigerant inflow pipeline through the subcooler, and the outdoor heat exchanger and the heat storage device are connected to the indoor heat exchanger through the subcooler.

4. The system according to claim 3, wherein The system further includes a subcooler solenoid valve; The subcooler solenoid valve is arranged on the refrigerant inflow pipeline, and the first end of the injection enthalpy branch is arranged between the subcooler solenoid valve and the subcooler.

5. The system according to claim 1, wherein The system further includes an oil-gas separator, and the oil-gas separator is arranged on the refrigerant outflow pipeline.

6. The system according to claim 1, wherein The system further includes a gas-liquid separator, and the gas-liquid separator is arranged on the refrigerant inflow pipeline.

7. The system according to claim 3, wherein The system further includes a subcooler electronic expansion valve, one end of the subcooler electronic expansion valve is connected to the subcooler, and the other end is connected to the outdoor heat exchanger and the heat storage device.

8. The system according to claim 3, wherein The system further includes an outdoor heat exchange electronic expansion valve and a heat storage electronic expansion valve; The outdoor heat exchange electronic expansion valve is arranged between the outdoor heat exchanger and the subcooler, and the heat storage electronic expansion valve is arranged between the heat storage device and the subcooler.

9. The system according to claim 3, wherein The system further includes a first filter, a second filter, a third filter, and a fourth filter; The first filter is arranged on the pipeline between the subcooler and the indoor heat exchanger. The second filter is arranged on the pipeline between the outdoor heat exchanger and the subcooler. The third filter is arranged on the pipeline between the heat storage device and the subcooler. The fourth filter is arranged on the pipeline between the interface E of the first four-way valve and the indoor heat exchanger.

10. An air conditioner, comprising a controller and the dual four-way valve air conditioning system according to any one of claims 1-9, characterized in that, The controller is connected to a first four-way valve and a second four-way valve included in the dual four-way valve air conditioning system, and the controller is configured to control the connection states of the first four-way valve and the second four-way valve according to the current working mode.

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