Air supply and enthalpy increase system, method and equipment for air conditioner and air conditioning system

Abstract

The invention relates to the technical field of air conditioners, and particularly discloses an air-conditioning air-supplementing and enthalpy-increasing system, method and equipment and an air-conditioning system.According to the system, a two-way valve, an electronic expansion valve, an enthalpy-increasing and air-supplementing compressor, the indoor side and the outdoor side of the air-conditioning system and a four-way valve used for switching a heating mode and a dehumidification mode form a pipeline channel. The first electronic expansion valve and the second electronic expansion valve can be opened to the maximum opening degree before reversing of the four-way valve, so that the reversing pressure difference of the four-way valve is reduced, the rapid reversing technology is achieved, the defrosting time is shortened, and the defrosting effect and efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning air supplementation and enthalpy increase system, method, equipment and air conditioning system. Background Art

[0002] Under low temperature conditions, an important factor affecting the heating effect of air conditioner units is the need to deal with frost. In the prior art, when defrosting, the unit must be shut down and switched back to normal heating, which not only affects the continuous heating effect of the unit, but also has a great impact on the thermal comfort of the user.

[0003] In view of the above problems, there are some solutions in the prior art. For example, patent CN106091464A introduces an air-injection enthalpy-increasing compressor system, which achieves the purpose of defrosting by means of bypass defrosting and conventional reversing defrosting. The disadvantage is that the bypass method is to mix the refrigerant after the exhaust bypass and the throttling of the second electronic expansion valve. The pressure difference between the two refrigerants is extremely large, causing severe pressure fluctuations in the entire air-conditioning system. In addition, conventional defrosting is still used in the face of harsh working conditions, and the reversal of the four-way valve during startup and shutdown has a greater impact on the indoor heating effect. For example, patent CN103574758B introduces a heat storage defrosting method, in which a heat storage device is introduced into the flow path, and the refrigerant is heated through the heat storage flow path when defrosting is required. The disadvantage of this unit is that the heat storage device has spare capacity under conventional low temperature conditions, but under low temperature conditions under lower working conditions, the heat of its heat storage device cannot support the refrigerant temperature to rise to a level sufficient to help defrost the evaporation side. Its use conditions are very limited and the promotion area is small. Patent CN211977301U also introduces an electromagnetic heating assisted defrosting method, which bypasses a secondary flow path. When defrosting is required, the refrigerant heated by the secondary flow path is mixed with the low-temperature and low-pressure refrigerant after throttling to increase the temperature of the evaporation side to avoid fin frosting caused by too low temperature. The disadvantage of this patent is that it introduces additional external heating components, which is inefficient and the heating effect of the electromagnetic heating components is poor under low temperature conditions. The electromagnetic heating effect is uncontrolled during the defrosting stage, and the single heating effect makes the entire unit inefficient. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an air conditioning air replenishment enthalpy increase system, method, device and air conditioning system to overcome the problem of poor defrosting application effect of current air conditioning systems.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present application provides an air conditioning air supplement and enthalpy increase system, comprising: an enthalpy increase air supplement compressor, a first electronic expansion valve, a second electronic expansion valve, a first two-way valve, a second two-way valve, a third two-way valve and a flash evaporator;

[0007] The air intake end of the enthalpy-increasing air-supplementing compressor is connected to the first end of the four-way valve for switching the heating and dehumidification modes in the air-conditioning system; the air discharge end of the enthalpy-increasing air-supplementing compressor is connected to the third end of the four-way valve; the air supply end of the enthalpy-increasing air-supplementing compressor is connected to the first end of the first two-way valve; the second end of the first two-way valve is connected to the first end of the flash steam;

[0008] The first end of the second two-way valve is connected to the first end of the first electronic expansion valve, and the first end of the second two-way valve is connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second two-way valve is connected to the first end of the third two-way valve;

[0009] The second end of the third two-way valve is connected to the second end of the second electronic expansion valve, and the second end of the third two-way valve is connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system; the first end of the second electronic expansion valve is connected to the third end of the flash steam; the second end of the flash steam is connected to the second end of the first electronic expansion valve;

[0010] The first end of the first electronic expansion valve is also connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second electronic expansion valve is also connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system;

[0011] The first electronic expansion valve and the second electronic expansion valve are used to open to the maximum opening before the four-way valve is switched, so as to reduce the switching pressure difference of the four-way valve.

[0012] In a second aspect, the present application provides an air conditioning air replenishment enthalpy increase method, which is applied to the air conditioning air replenishment enthalpy increase system as described above, comprising:

[0013] Collect the external ambient temperature of the air conditioning system;

[0014] Determine whether the outside ambient temperature is lower than or equal to the frost suppression lower limit ambient temperature, if so, apply the defrost mode; if not, collect the air conditioner outer pipe temperature;

[0015] Determine whether the air conditioner outer pipe temperature is lower than or equal to the frost suppression lower limit outer pipe temperature. If so, apply the defrost mode; if not, apply the frost suppression mode.

[0016] Furthermore, in some embodiments of the present application, in the frost suppression mode:

[0017] The frequency of the enthalpy-increasing air-supplementing compressor is reduced to a first preset frequency, the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening, the first two-way valve and the second two-way valve are closed, and the third two-way valve is opened;

[0018] And in the frost suppression mode, the air conditioning system maintains a heating state.

[0019] Furthermore, in some embodiments of the present application, the process of applying the frost suppression mode also includes:

[0020] When it is detected that the temperature of the air conditioner outer pipe rises to a preset temperature, or after it is determined that the frost suppression mode has been running for a preset time, the frost suppression mode is exited.

[0021] Further, in some embodiments of the present application, the exiting the frost suppression mode includes:

[0022] The frequency of the enthalpy-increasing air-supplying compressor is controlled to increase, and the third two-way valve is controlled to be closed, the first two-way valve is controlled to be opened, and the first electronic expansion valve and the second electronic expansion valve are adjusted to the expansion valve opening before entering frost suppression, so that the air-conditioning system enters the next heating cycle.

[0023] Further, in some embodiments of the present application, in the defrost mode:

[0024] The enthalpy-increasing air-supplementing compressor is reduced to a second preset frequency, the first two-way valve is closed, the second two-way valve is opened, the third two-way valve is closed, and the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening;

[0025] And after a preset time, the four-way valve is controlled to directly switch from the heating state to the cooling state.

[0026] Furthermore, in some embodiments of the present application, in the process of applying the defrost mode, it also includes:

[0027] When it is detected that the temperature of the air conditioner outer pipe rises to a preset temperature, the defrost mode is exited.

[0028] Further, in some embodiments of the present application, the exiting the defrost mode includes:

[0029] The enthalpy-increasing air-supplying compressor is controlled to rise to a third preset frequency, and the first two-way valve is controlled to open, the second two-way valve and the third two-way valve are controlled to close, and the first electronic expansion valve and the second electronic expansion valve are controlled to restore to the opening degree before entering the defrost mode.

[0030] In a third aspect, the present application provides an air conditioning air supplement enthalpy increase device, comprising a processor and a memory, wherein the processor is connected to the memory:

[0031] Wherein, the processor is used to call and execute the program stored in the memory;

[0032] The memory is used to store the program, and the program is at least used for the above-mentioned air conditioning air supplementation and enthalpy increase method.

[0033] In a fourth aspect, the present application provides an air-conditioning system, comprising an air-conditioning main body and the air-conditioning air replenishment and enthalpy increase system as described above.

[0034] The present invention relates to the field of air conditioning technology, and specifically to an air conditioning air supply and reheat increasing system, method, equipment and air conditioning system. The system forms a pipeline through a two-way valve and an electronic expansion valve, a reheat increasing air supply compressor and the indoor side, outdoor side and a four-way valve for switching heating and dehumidification modes of the air conditioning system. When defrosting is required, the first electronic expansion valve and the second electronic expansion valve can be used to open to the maximum opening before the switching of the four-way valve to reduce the switching pressure difference of the four-way valve, thereby realizing fast switching technology, shortening the defrosting time, and improving the defrosting effect and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 Schematic diagram of the structure of the air conditioning air supplementary enthalpy increasing system provided by an embodiment of the present invention;

[0037] Figure 2 1 is a flow chart of an air conditioning air replenishment enthalpy increase method provided by an embodiment of the present invention;

[0038] Figure 3 is a flow chart of an air conditioning air supplementation and enthalpy increase method provided by another embodiment of the present invention;

[0039] Figure 4 is an application principle diagram of the air conditioning air supplementation and enthalpy increase method provided by an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram of an air conditioning air supplementation and enthalpy increase device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0042] Application Overview:

[0043] In the existing technology, optimizing the defrosting method is an important way to improve the heating effect of low-temperature heat pump units. Whenever the defrosting stage is entered, the compressor of the unit needs to be shut down, the four-way valve needs to be switched, and then the defrosting process starts. After the defrosting is completed, the unit will shut down again, and the four-way valve will be switched again. This is a long process. This process has a great impact on the heating operation ability of the unit and also has a great impact on the indoor temperature comfort. The current mainstream has many problems including the following:

[0044] 1. In conventional low-temperature heating conditions, the defrost cycle is short and defrost is started frequently, which increases the risk of compressor reliability and poor heating comfort for users in the room.

[0045] 2. Under extremely low temperature heating conditions, the defrosting effect of the air-injection and enthalpy-increasing model is slow and the defrosting time is long.

[0046] 3. Liquid hammer caused by liquid in the replenishment air during heating and defrosting of the air-injection and enthalpy-increasing model.

[0047] 4. In conventional reversing defrosting, since the indoor unit is on the evaporation side, frost will form. After defrosting, the indoor unit needs to be defrosted again, which makes the time to exit the cold wind protection longer.

[0048] 4. It requires additional external heating or heat storage devices, and the mechanism is inefficient.

[0049] The present application makes targeted improvements and organically combines the two defrosting methods commonly used in the industry, namely the "hot gas defrost" mode and the conventional reversing defrost, through an air-conditioning unit system based on an increased enthalpy air supply model. That is, the "frost suppression" mode (hot gas defrost) is retained: the suppression can still maintain the heating of the unit and has little impact on the indoor effect, and can maintain an efficient defrosting effect under harsh low temperature conditions. That is, there is no need for additional external heat sources or redundant heat storage devices. The existing devices of the air-supply increased enthalpy unit can be used to complete a series of controls and improve the heating effect.

[0050] Figure 1 is a structural diagram of the air conditioning air supply enthalpy increase system provided by an embodiment of the present invention, please refer to Figure 1 The air conditioning air supply and enthalpy increase system of this embodiment may include: an enthalpy increase air supply compressor ( Figure 1 The parts in the dotted frame are the enthalpy-increasing air-supply compressor), the first electronic expansion valve, the second electronic expansion valve, the first two-way valve, the second two-way valve, the third two-way valve and the flash evaporator.

[0051] Among them, the suction end of the enthalpy-increasing air-increasing compressor is connected to the first end of the four-way valve for switching the heating and dehumidification modes in the air-conditioning system; the exhaust end of the enthalpy-increasing air-increasing compressor is connected to the third end of the four-way valve; the air-increasing end of the enthalpy-increasing air-increasing compressor is connected to the first end of the first two-way valve; the second end of the first two-way valve is connected to the first end of the flash steam; the first end of the second two-way valve is connected to the first end of the first electronic expansion valve, and the first end of the second two-way valve is connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second two-way valve is connected to the first end of the third two-way valve; the second end of the third two-way valve is connected to the second end of the second electronic expansion valve, and the second end of the third two-way valve is connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system; the first end of the second electronic expansion valve is connected to the third end of the flash steam; the second end of the flash steam is connected to the second end of the first electronic expansion valve; and the first end of the first electronic expansion valve is also connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second electronic expansion valve is also connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system.

[0052] On this basis, when defrosting or defrosting is required (the frost treatment methods mentioned in this application are divided into two types, the first is defrosting or defrosting, and the other is frost suppression. Its basic definition or essential principle can be understood based on the existing air-conditioning system and will not be repeated here), the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening before the four-way valve is switched, thereby reducing the switching pressure difference of the four-way valve and improving the defrosting effect and efficiency.

[0053] Among them, it should be noted that Figure 1 In the embodiment, the suction end corresponds to the gas-liquid separator of the compressor (i.e., the heat-increasing air-supply compressor), the exhaust end corresponds to the compressor main bar body, and the air-supply end corresponds to the compressor air-supply pipe, which together constitute the heat-increasing air-supply compressor.

[0054] On this basis, the present application provides an air conditioning air replenishment enthalpy increase method, which is applied to the air conditioning air replenishment enthalpy increase system as described above. Figure 2 is a flow chart of a method for increasing enthalpy of air conditioning provided by an embodiment of the present invention. Figure 2 As shown, it may specifically include:

[0055] S101. Collect the external ambient temperature of the air conditioning system.

[0056] S102: Determine whether the outside ambient temperature is lower than or equal to the frost suppression lower limit ambient temperature. If so, apply the defrost mode; if not, collect the air conditioner outer pipe temperature.

[0057] S103, determining whether the air conditioner external pipe temperature is lower than or equal to the frost suppression lower limit external pipe temperature, if so, applying the defrost mode; if not, applying the frost suppression mode.

[0058] It should be noted that the air conditioning air replenishment and enthalpy increase method provided in the present application is only applied in the stages where defrosting or frost suppression is required, and the operating conditions of the air conditioning system in other stages are not controlled. For the operating conditions in other stages, the air conditioning system can be controlled based on the existing control logic.

[0059] Specifically, the frost treatment method selected under the current working conditions needs to meet the pre-determination conditions. First, it is determined whether the external ambient temperature of the air-conditioning system, that is, the outer ring temperature T1, is less than or equal to the lower limit ambient temperature of frost suppression, that is, the preset value 1.

[0060] When the outer ring temperature T1 is less than or equal to the preset value 1, the defrost mode is applied (in actual applications, in order to ensure system stability, the specific application can be to make the system default to directly enter the defrost mode the next time the above conditions are met and frost treatment is required).

[0061] Furthermore, if the outer ring temperature T1 is higher than the preset value 1, the air conditioner outer tube temperature (i.e., the refrigerant temperature before the condenser enters the capillary tube) is collected, and the air conditioner outer tube temperature is further judged. Specifically, if the outer tube temperature T2 is less than or equal to the lower limit outer tube temperature of frost suppression, i.e., the preset value 2, then it is considered that this working condition has severe conditions such as "freezing rain", and the defrost mode is applied. For example, the defrost mode will be used for the next frost treatment of the system. If the outer tube temperature is higher than the lower limit outer tube temperature of frost suppression, this working condition can be regarded as a conventional heating working condition, which can meet the frost suppression working mode, and the frost suppression mode will be used for the next frost treatment.

[0062] Figure 3 is a flow chart of an air conditioning air replenishment enthalpy increase method provided by another embodiment of the present invention, Figure 3 In the figure, after the initial temperature judgment, the left side is the application of frost suppression mode, and the right side is the application of defrost mode, such as Figure 3 As shown:

[0063] In the frost suppression mode: the frequency of the enthalpy-increasing air-supplementing compressor is reduced to the first preset frequency, i.e., F1, the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening, the first two-way valve and the second two-way valve are closed, and the third two-way valve is opened; and in the frost suppression mode, the air-conditioning system maintains the heating state. And in the process of applying the frost suppression mode, when it is detected that the temperature of the air-conditioning outer pipe rises to the preset temperature, or after determining that the frost suppression mode has been running for a preset time, the frost suppression mode is exited. Among them, the specific execution action of exiting the frost suppression mode includes controlling the frequency of the enthalpy-increasing air-supplementing compressor to increase, and controlling the third two-way valve to close, the first two-way valve to open, and the first electronic expansion valve and the second electronic expansion valve to adjust to the expansion valve opening before entering the frost suppression, so that the air-conditioning system enters the next heating cycle.

[0064] In the defrost mode: the enthalpy-added air supply compressor is reduced to the second preset frequency, the first two-way valve is closed, the second two-way valve is opened, the third two-way valve is closed, and the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening; and after a preset time, the four-way valve is controlled to directly switch from the heating state to the cooling state. And in the process of applying the defrost mode, it also includes: when it is detected that the temperature of the air conditioner outer pipe rises to the preset temperature, the defrost mode is exited. Among them, the specific execution actions of exiting the defrost mode include: controlling the enthalpy-added air supply compressor to rise to the third preset frequency, and controlling the first two-way valve to open, the second two-way valve and the third two-way valve to close, and the first electronic expansion valve and the second electronic expansion valve to return to the opening before entering the defrost mode.

[0065] Specifically, Figure 3 As shown, in the frost suppression mode, the unit will maintain the heating mode, the compressor frequency will first be reduced to the first preset frequency F1, and the first and second electronic expansion valves will be opened to the maximum opening to increase the evaporation temperature of the outdoor refrigerant.

[0066] Furthermore, in order to avoid liquid hammer caused by liquid refrigerant entering the compressor through the air supply pipe when the frequency is reduced and the expansion valve is fully opened, the first two-way valve can be closed, the second two-way valve can be kept closed, and the third two-way valve can be opened to mix the normal temperature refrigerant after throttling by the first electronic expansion valve with the low temperature refrigerant after throttling by the second electronic expansion valve to increase the temperature of the refrigerant entering the evaporator.

[0067] When the frost on the outdoor side melts, the pipe temperature rises to the preset temperature such as the frost suppression exit temperature or the frost suppression mode continues to run for a preset time, the frost suppression mode is exited, the compressor frequency is controlled to increase, the third two-way valve is closed, the first two-way valve is opened, and the first and second electronic expansion valves are adjusted to the expansion valve opening before entering the frost suppression mode to enter the next heating cycle.

[0068] In defrost mode, the unit will switch to refrigeration mode for defrosting, but keep the compressor running. The compressor frequency is first reduced to the second preset frequency F2. As above, to avoid liquid hammer, the first two-way valve is closed, the second two-way valve is opened, and the first and second electronic expansion valves are opened to the maximum valve opening to reduce the four-way valve switching pressure difference. After reducing the frequency from running to the preset time, the four-way valve will directly switch from heating to cooling without stopping the compressor, and the frequency will rise to the preset defrost frequency. At this stage, in order to avoid greater fluctuations in the indoor environment caused by freezing of the indoor unit, the second two-way valve is used. The principle is consistent with the third two-way valve principle in the above-mentioned frost suppression mode. The normal temperature refrigerant after throttling of the second electronic expansion valve is mixed with the low temperature refrigerant after throttling of the first electronic expansion valve to increase the temperature of the refrigerant entering the evaporator and reduce the degree of frost in the indoor unit.

[0069] Run until the pipe temperature rises to the defrost exit pipe temperature. When the external pipe temperature meets this temperature, the compressor also keeps running, reduces the frequency to the preset frequency F3, and the four-way valve is directly powered on and switched from heating to cooling, and the first two-way valve is opened, the second two-way valve is closed, and the frequency begins to rise to the operating frequency before defrosting, and the first and second electronic expansion valves adjust the valve opening to the preset valve opening. Start the next round of heating cycle.

[0070] Figure 4 is an application principle diagram of the air conditioning air replenishment enthalpy increase method provided by an embodiment of the present invention, such as Figure 4 As shown, the air conditioning air replenishment and enthalpy increase method provided in the present application first determines which frost treatment is applicable to the current working conditions based on the external ambient temperature and the external pipe temperature, that is, whether to apply "frost suppression" or "defrost" mode, and then adopts the used mode to perform defrosting, that is, frost treatment. During the defrosting process, when the preset external pipe temperature is reached (or the operating time reaches the preset time), it is judged that the defrosting is completed, that is, the frost suppression mode or the defrost mode is exited, including adjusting the two-way pipe and the four-way pipe to start the next heating cycle.

[0071] In this air conditioning air replenishment and enthalpy increase method, the defrost mode is a commonly used shutdown defrost mode in the industry. During the defrost operation stage, the second two-way valve is used to replenish air to slow down the indoor freezing speed. At the beginning and end stages, the four-way valve is switched without stopping the machine, so that the unit can enter and exit the defrost state faster, avoiding the impact of the defrost operation on the indoor working conditions as much as possible, and can exit the cold wind protection mode faster, thereby achieving the purpose of improving the heating effect.

[0072] After entering the next heating cycle, a new round of testing is started after a preset time, such as 10 minutes, and the above process is repeated. In this way, under harsh heating conditions, without introducing external heat sources, the combined treatment of heat recovery frost suppression and fast reversing defrosting is achieved, achieving the optimal solution to the defrosting problem of the air conditioning system.

[0073] The air conditioning air replenishment and reheat increase method provided by the present application, under conventional low-temperature conditions, through the flash evaporator device of the air replenishment and reheat increase compressor, the replenishment part and the low-temperature refrigerant after throttling are merged, and air is replenished in advance on the evaporation side, so as to increase the enthalpy value of the refrigerant entering the evaporator and thus increase the temperature on the evaporation side, and suppress frost to achieve the effect of delaying the frosting of the outdoor unit; at the same time, under extreme low-temperature conditions (for example: freezing rain), without introducing an external heat source, through the rapid reversing defrosting technology, compared with the conventional compressor start and stop and four-way switching, the rapid reversing technology can shorten the defrosting time, be more efficient, and exit the cold wind protection faster; and under even lower temperature conditions, the unit still needs reversing defrosting. Frost is used to ensure the heating effect. During the reversing defrost, since it is in a refrigeration state, more liquid refrigerant will accumulate in the flash evaporator. At this time, the air supply switch of the compressor can be turned off to prevent liquid refrigerant from entering the compressor and causing liquid hammer; and in the conventional defrost stage, air is supplied inside in advance through a pipeline device, similar to a frost suppression method, to avoid excessive ice formation in the machine during the conventional reversing defrost stage, so that the cold air can be released more quickly and the next heating cycle can be started; and the air-conditioning air supply and reheat increase method provided in the present application does not require the introduction of additional external devices, but can achieve the above-mentioned purpose by using the flash evaporator device of the air supply and reheat increase unit itself, which has strong applicability and is easy to promote.

[0074] Based on the same inventive concept, the present application also provides an air conditioning air supply enthalpy increase device, such as Figure 5 As shown, the device includes a processor and a memory, and the processor 1 is connected to the memory 2: wherein the processor 1 is used to call and execute the program stored in the memory 2; the memory 2 is used to store the program, which is at least used to execute the above-mentioned air conditioning air replenishment enthalpy increase method.

[0075] The specific implementation scheme of the air conditioning air replenishment and reheat increasing device provided in the embodiment of the present application can refer to the implementation scheme of the air conditioning air replenishment and reheat increasing method in any of the above embodiments, which will not be repeated here.

[0076] Based on the same inventive concept, the present application also provides an air-conditioning system, including an air-conditioning main body and the air-conditioning air replenishment and enthalpy increase system as described above.

[0077] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0078] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0079] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0080] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0081] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0082] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0083] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An air conditioning air supply enthalpy increase system, characterized in that: include: An enthalpy-increasing air-supplementing compressor, a first electronic expansion valve, a second electronic expansion valve, a first two-way valve, a second two-way valve, a third two-way valve and a flash evaporator; The air intake end of the enthalpy-increasing air-supplementing compressor is connected to the first end of the four-way valve for switching the heating and dehumidification modes in the air-conditioning system; the air discharge end of the enthalpy-increasing air-supplementing compressor is connected to the third end of the four-way valve; the air supply end of the enthalpy-increasing air-supplementing compressor is connected to the first end of the first two-way valve; the second end of the first two-way valve is connected to the first end of the flash steam; The first end of the second two-way valve is connected to the first end of the first electronic expansion valve, and the first end of the second two-way valve is connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second two-way valve is connected to the first end of the third two-way valve; The second end of the third two-way valve is connected to the second end of the second electronic expansion valve, and the second end of the third two-way valve is connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system; the first end of the second electronic expansion valve is connected to the third end of the flash steam; the second end of the flash steam is connected to the second end of the first electronic expansion valve; The first end of the first electronic expansion valve is also connected to the second end of the four-way valve through the indoor side of the air-conditioning system; the second end of the second electronic expansion valve is also connected to the fourth end of the four-way valve through the outdoor side of the air-conditioning system; The first electronic expansion valve and the second electronic expansion valve are used to open to the maximum opening before the four-way valve is switched, so as to reduce the switching pressure difference of the four-way valve.

2. An air conditioning air replenishment enthalpy increase method, applied to the air conditioning air replenishment enthalpy increase system as claimed in claim 1, characterized in that: include: Collect the external ambient temperature of the air conditioning system; Determine whether the outside ambient temperature is lower than or equal to the frost suppression lower limit ambient temperature, if so, apply the defrost mode; if not, collect the air conditioner outer pipe temperature; Determine whether the air conditioner outer pipe temperature is lower than or equal to the frost suppression lower limit outer pipe temperature. If so, apply the defrost mode; if not, apply the frost suppression mode.

3. The air conditioning air supplementation and enthalpy increase method according to claim 2, characterized in that: In the frost suppression mode: The frequency of the enthalpy-increasing air-supplementing compressor is reduced to a first preset frequency, the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening, the first two-way valve and the second two-way valve are closed, and the third two-way valve is opened; And in the frost suppression mode, the air conditioning system maintains a heating state.

4. The air conditioning air supplementation and enthalpy increase method according to claim 2, characterized in that: Also includes: In the process of applying the frost suppression mode, it also includes: When it is detected that the temperature of the air conditioner outer pipe rises to a preset temperature, or after it is determined that the frost suppression mode has been running for a preset time, the frost suppression mode is exited.

5. The air conditioning air supplementation enthalpy increase method according to claim 4, characterized in that: The exit from the frost suppression mode includes: The frequency of the enthalpy-increasing air-supplying compressor is controlled to increase, and the third two-way valve is controlled to be closed, the first two-way valve is controlled to be opened, and the first electronic expansion valve and the second electronic expansion valve are adjusted to the expansion valve opening before entering frost suppression, so that the air-conditioning system enters the next heating cycle.

6. The air conditioning air supplementation enthalpy increase method according to claim 2, characterized in that: In the defrost mode: The enthalpy-increasing air-supplementing compressor is reduced to a second preset frequency, the first two-way valve is closed, the second two-way valve is opened, the third two-way valve is closed, and the first electronic expansion valve and the second electronic expansion valve are opened to the maximum opening; And after a preset time, the four-way valve is controlled to directly switch from the heating state to the cooling state.

7. The air conditioning air supplementation and enthalpy increase method according to claim 2, characterized in that: In applying the defrost mode, the process also includes: When it is detected that the temperature of the air conditioner outer pipe rises to a preset temperature, the defrost mode is exited.

8. The air conditioning air supplementation and enthalpy increase method according to claim 7, characterized in that: The exiting defrost mode includes: The enthalpy-increasing air-supplying compressor is controlled to rise to a third preset frequency, and the first two-way valve is controlled to open, the second two-way valve and the third two-way valve are controlled to close, and the first electronic expansion valve and the second electronic expansion valve are controlled to restore to the opening degree before entering the defrost mode.

9. An air conditioning air supply enthalpy increase device, characterized in that: The invention comprises a processor and a memory, wherein the processor is connected to the memory: Wherein, the processor is used to call and execute the program stored in the memory; The memory is used to store the program, and the program is at least used to execute the air conditioning air replenishment enthalpy increase method described in any one of claims 2-8.

10. An air conditioning system, characterized in that: It comprises an air-conditioning main body and the air-conditioning air-supplementing and enthalpy-increasing system as claimed in claim 1.

Images