Heating system, defrosting control method, air conditioner and computer readable storage medium

Abstract

The application discloses a heating system, a defrosting control method, an air conditioner and a computer readable storage medium, and belongs to the technical field of new energy. In the normal heating process, the application adopts phase separation technology, introduces the mixed refrigerant after heat exchange into a phase separator for gas-liquid separation, and after the liquid refrigerant is separated from the phase separator, enters an evaporator to continue heat exchange and then returns to the suction port of a compressor, and after the gaseous refrigerant is separated from the phase separator, directly enters the suction port of the compressor, thereby improving the return gas temperature and further improving the heating capacity of the heating system. In the process of defrosting without stopping, by changing the opening and closing states of each electronic expansion valve and switch, the high-temperature gaseous refrigerant output by the compressor can be directly output to the evaporator exhaust to help defrosting, and meanwhile, it is ensured that the evaporator exhaust will not frost, in combination with adjusting the rotating speed of the inner fan, cold air blowing is prevented, and it is ensured that the air outlet temperature of the air outlet will not be obviously reduced, and the user experience in the stage of defrosting without stopping is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly to a heating system, a defrosting control method, an air conditioner and a computer readable storage medium. BACKGROUND

[0002] With the development of society, air conditioners have gradually become essential electrical appliances in most homes. In the case of low ambient temperature, people often turn on the air conditioner for heating. In the process of heating by the heating system of the air conditioner, frost will gradually appear on the evaporator of the outdoor unit. If defrosting is not performed, the heating capacity will be severely reduced.

[0003] In order to defrost without interrupting heating, the existing technology generally adopts the methods of heat storage defrosting or hot gas defrosting. However, heat storage defrosting will affect the reliability of the compressor, and hot gas defrosting will greatly affect the heat exchange amount in the heating process. Therefore, the existing non-stop defrosting solutions all have defects. SUMMARY

[0004] The main purpose of the present application is to provide a heating system, a defrosting control method, an air conditioner and a computer readable storage medium, which aims to solve the technical problem of how to ensure non-stop defrosting while avoiding affecting the heating capacity and the reliability of the compressor.

[0005] To achieve the above purpose, the present application provides a heating system, which comprises:

[0006] a compressor, the compressor comprising an input end and an output end;

[0007] a condenser, the input end of the condenser being in communication with the output end of the compressor;

[0008] an evaporator, the evaporator comprising an evaporator inner row and an evaporator outer row, the input end of the evaporator inner row being in communication with the output end of the condenser, and a first electronic expansion valve being arranged between the condenser and the evaporator inner row;

[0009] the output end of the evaporator inner row being in communication with the input end of the compressor, and a first switch being arranged between the evaporator inner row and the compressor;

[0010] the output end of the evaporator outer row being in communication with the input end of the compressor;

[0011] a phase separator, the input end of the phase separator being in communication with the output end of the compressor and the output end of the evaporator inner row respectively, a second electronic expansion valve being arranged between the phase separator and the output end of the compressor, and a second switch being arranged between the phase separator and the output end of the evaporator inner row;

[0012] The two outputs of the phase separator are respectively communicated with the input of the compressor and the input of the evaporator outtake, and a third switch is arranged between the phase separator and the input of the compressor;

[0013] When the heating system starts heating, the first electronic expansion valve, the second switch and the third switch are opened, and the second electronic expansion valve and the first switch are closed; when the heating system starts defrosting, the first electronic expansion valve, the second electronic expansion valve and the first switch are opened, and the second switch and the third switch are closed, and the opening degrees of the first electronic expansion valve and the second electronic expansion valve are adjusted to defrost the evaporator.

[0014] Optionally, the heating system further comprises:

[0015] A first sensor is arranged at the output of the evaporator in-take, and is used to detect the temperature of the output of the evaporator in-take.

[0016] A second sensor is arranged at the output of the evaporator out-take, and is used to detect the temperature of the output of the evaporator out-take.

[0017] Optionally, the heating system further comprises:

[0018] An inner air fan is arranged on the air duct where the condenser is located.

[0019] In addition, to achieve the above-mentioned purpose, the application further provides a defrosting control method of a heating system, which is applied to the heating system as mentioned above, and comprises the following steps:

[0020] Obtaining the operation mode of the heating system;

[0021] Adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system, so that the heating system performs heating or defrosting.

[0022] Optionally, the step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system comprises:

[0023] When the operation mode of the heating system is the heating mode, the first electronic expansion valve, the second switch and the third switch are opened, and the second electronic expansion valve and the first switch are closed.

[0024] Optionally, the step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system further comprises:

[0025] When the operation mode of the heating system is the defrosting mode, the first electronic expansion valve, the second electronic expansion valve and the first switch are opened, and the second switch and the third switch are closed.

[0026] Optionally, the step of closing the second switch and the third switch further comprises:

[0027] acquiring a first outlet temperature of the evaporator external exhaust;

[0028] adjusting the opening degree of the second electronic expansion valve according to the first outlet temperature of the evaporator external exhaust, the higher the first outlet temperature, the smaller the opening degree of the second electronic expansion valve.

[0029] Optionally, the step of closing the second switch and the third switch further comprises:

[0030] acquiring a second outlet temperature of the evaporator internal exhaust;

[0031] adjusting the opening degree of the first electronic expansion valve according to the second outlet temperature of the evaporator internal exhaust, the higher the second outlet temperature, the smaller the opening degree of the first electronic expansion valve, and adjusting the rotating speed of the internal fan in the heating system.

[0032] In addition, to achieve the above object, the present application also provides an air conditioner, which comprises a memory, a processor and a control program of a heating system stored in the memory and executable on the processor, and the control program of the heating system, when executed by the processor, implements the steps of the defrosting control method of the heating system.

[0033] In addition, to achieve the above object, the present application also provides a computer readable storage medium, which stores a control program of a heating system, and the control program of the heating system, when executed by a processor, implements the steps of the defrosting control method of the heating system.

[0034] The application provides a heating system, a defrosting control method, an air conditioner and a computer readable storage medium, and overcomes the technical problems of heat exchange capacity reduction and influence on compressor reliability in the non-stop defrosting scheme in the prior art. The application improves the heating system, adopts phase separation technology in the normal heating process, introduces the mixed refrigerant after heat exchange into a phase separator for gas-liquid separation, and the liquid refrigerant is separated from the phase separator, enters an evaporator for continuous heat exchange, and then returns to the suction port of the compressor, the gaseous refrigerant is separated from the phase separator and directly enters the suction port of the compressor, the return gas temperature is improved, and the heating capacity of the heating system is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structural schematic diagram of an embodiment of the heating system of the application.

[0036] Figure 2 is a hardware structure schematic diagram related to the operation of an embodiment of the application.

[0037] Figure 3 is a flow schematic diagram of an embodiment of the defrosting control method of the heating system of the application.

[0038] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0039] It should be understood that the specific embodiments described herein are only used to explain the application and not to limit the application.

[0040] The embodiment of the application provides a heating system, which refers to Figure 1 , Figure 1 is a structural schematic diagram of an embodiment of the heating system of the application.

[0041] In the embodiment, the heating system comprises:

[0042] The compressor 10 comprises an input end and an output end;

[0043] The condenser 20 is communicated with the output end of the compressor 10.

[0044] An evaporator 30, which comprises an evaporator inner row 31 and an evaporator outer row 32, an input end of the evaporator inner row 31 is communicated with an output end of the condenser 20, a first electronic expansion valve 41 is arranged between the condenser 20 and the evaporator inner row 31;

[0045] An output end of the evaporator inner row 31 is communicated with an input end of the compressor 10, a first switch 51 is arranged between the evaporator inner row 31 and the compressor 10;

[0046] An output end of the evaporator outer row 32 is communicated with an input end of the compressor 10;

[0047] A phase separator 40, an input end of the phase separator 40 is respectively communicated with an output end of the compressor 10 and an output end of the evaporator inner row 31, a second electronic expansion valve 42 is arranged between the phase separator 40 and the output end of the compressor 10, a second switch 52 is arranged between the phase separator 40 and the output end of the evaporator inner row 31;

[0048] Two output ends of the phase separator 40 are respectively communicated with an input end of the compressor 10 and an input end of the evaporator outer row 32, a third switch 53 is arranged between the phase separator 40 and the input end of the compressor 10;

[0049] When the heating system starts heating, the first electronic expansion valve 41, the second switch 52 and the third switch 52 are opened, the second electronic expansion valve 42 and the first switch 51 are closed; when the heating system starts defrosting, the first electronic expansion valve 41, the second electronic expansion valve 42 and the first switch 51 are opened, the second switch 52 and the third switch 53 are closed, and the opening degree of the first electronic expansion valve 41 and the second electronic expansion valve 42 is adjusted to defrost the evaporator 30.

[0050] It is to be noted that in the embodiment, the compressor 10 is a driven fluid machine for lifting low-pressure gas into high-pressure gas, which is used for compressing and conveying refrigerant and is the heart of the heating system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, and after being compressed by the piston driven by the motor, it discharges high-temperature and high-pressure gaseous refrigerant to the exhaust pipe to provide power for the heating cycle. Thus, the heating cycle of compression→condensation (heat release)→expansion→evaporation (heat absorption) is realized, and the refrigerant is cooled and condensed in the condenser 20, and then enters the evaporator 30 through the evaporator inner row 31 and the evaporator outer row 32. Figure 1 The arrow direction marked in the figure can know the flow direction of the refrigerant.

[0051] In this embodiment, the condenser 20 and the evaporator 30 are devices for transferring part of the heat of the hot fluid to the cold fluid, also known as heat exchangers, which are energy-saving devices for achieving heat transfer between materials between two or more fluids at different temperatures. Alternatively, they can be floating head heat exchangers, fixed tube plate heat exchangers, U-shaped tube plate heat exchangers, plate heat exchangers, etc. In this embodiment, a plate heat exchanger is taken as an example for description, which does not limit the specific types of the condenser 20 and the evaporator 30. The condenser 20 includes two pipe openings for providing a channel for flowing refrigerant. The evaporator 30 includes two rows of heat exchangers, i.e., an inner row of evaporator 31 and an outer row of evaporator 32. The inner row of evaporator 31 and the outer row of evaporator 32 both include two pipe openings for providing a channel for flowing refrigerant.

[0052] As an example, in this embodiment, the heating system further includes:

[0053] A first sensor 310 is arranged at the output end of the inner row of evaporator 31 for detecting the temperature of the output end of the inner row of evaporator 31.

[0054] A second sensor 320 is arranged at the output end of the outer row of evaporator 32 for detecting the temperature of the output end of the outer row of evaporator 32.

[0055] It can be understood that in the heating mode, if the outdoor environment temperature is too low, the evaporator 30 in the outdoor unit may be defrosted. In order to monitor the defrosting condition, a temperature sensor needs to be arranged in the evaporator 30 for real-time monitoring whether the temperature of the evaporator 30 meets the defrosting condition. Since the heat exchange conditions of the inner row of evaporator 31 and the outer row of evaporator 32 are not completely the same, the temperatures of the inner row of evaporator 31 and the outer row of evaporator 32 are also not the same. Therefore, two temperature sensors, i.e., the first sensor 310 and the second sensor 320, need to be configured for the inner row of evaporator 31 and the outer row of evaporator 32, respectively, to monitor the outlet temperature of the inner row of evaporator 31 (i.e., the temperature of the output end of the inner row of evaporator 31) and the outlet temperature of the outer row of evaporator 32 (i.e., the temperature of the output end of the outer row of evaporator 32), respectively.

[0056] In the embodiment, the phase separator 40 is a gas-liquid separator, which can adopt many separation structures. The separation methods include gravity sedimentation, baffle separation, centrifugal force separation and filler separation. In the gravity sedimentation, the liquid has a downward velocity due to the gravity, while the gas still flows in the original direction, that is, the liquid and the gas have a separation tendency in the gravity field. The downward liquid adheres to the wall surface and is collected together and discharged through the discharge pipe. In the baffle separation, the gas flows in the direction of the resistance, while the liquid has a forward velocity due to the inertia. The forward liquid adheres to the resistance wall surface and is collected together and discharged through the discharge pipe. In the centrifugal force separation, the liquid has a centrifugal separation tendency due to the centrifugal force. The liquid adheres to the separation wall surface and is collected together and discharged through the discharge pipe. In the filler separation, the liquid adheres to the surface of the resistance filler and is collected together and discharged through the discharge pipe. The filler has a larger resistance wall area than the baffle, and the liquid is more likely to adhere to the wall surface due to the repeated baffle flow, so that the separation efficiency is higher.

[0057] In the embodiment, the heating system generally operates in the heating mode. At this time, the first electronic expansion valve 41, the second switch 52 and the third switch 53 are opened, the second electronic expansion valve 42 and the first switch 51 are closed, the compressor 10 compresses the discharged gaseous refrigerant and directly delivers it to the condenser 20 for heat dissipation and condensation. The gaseous refrigerant is delivered to the evaporator inner discharge 31 through the first electronic expansion valve 41, and is evaporated and heated to obtain mixed refrigerant. The mixed refrigerant is delivered to the phase separator 40 through the second switch 52 to obtain gaseous refrigerant and liquid refrigerant. The gaseous refrigerant is directly input to the compressor 10 for compression through the third switch 53, while the liquid refrigerant is input to the evaporator outer discharge 32 for evaporation and heating to obtain gaseous refrigerant, and finally enters the compressor 10 for compression, and the cycle is repeated.

[0058] In this embodiment, when the heating system operates in the heating mode for a certain period of time, if the outdoor ambient temperature is low, frost will appear on the evaporator outer row 32. In this embodiment, the frost melting of the evaporator outer row 32 is determined by combining the outlet temperature of the evaporator outer row 32 detected by the second sensor 320. When the heating system starts the defrosting function, the first electronic expansion valve 41, the second electronic expansion valve 42 and the first switch 51 are opened, and the second switch 52 and the third switch 53 are closed. The compressor 10 compresses the gaseous refrigerant discharged and part of it is transported to the condenser 20, and part of it is directly transported to the phase separator 40 through the second electronic expansion valve 42, and then to the evaporator outer row 32. Since this part of the gaseous refrigerant is high-temperature and high-pressure gaseous refrigerant, it can help the evaporator outer row 32 to achieve a significant defrosting effect. The flow of high-temperature gaseous refrigerant entering the evaporator outer row 32 is controlled by adjusting the opening of the second electronic expansion valve 42, and the opening of the second electronic expansion valve 42 is dynamically adjusted according to the outlet temperature Tb of the evaporator outer row 32 measured by the second sensor 320 to achieve complete defrosting. The part of the gaseous refrigerant transported to the condenser 20 is still subjected to the heat dissipation and condensation process, and then transported to the evaporator inner row 31 through the first expansion valve 41 for heat absorption and evaporation. Since the liquid refrigerant input to the evaporator inner row 31 is not as much as in the normal heating condition at this time, the evaporator inner row 31 has enough capacity to evaporate this part of the liquid refrigerant, and the output refrigerant is basically gaseous refrigerant, which does not need to be separated and can be directly transported to the compressor 10 through the first switch 51 for compression and repeated circulation. That is, during the defrosting stage, the phase separator 40 no longer plays the role of gas-liquid separation, but plays the role of a gaseous refrigerant transfer station between the compressor 10 and the evaporator outer row 32.

[0059] It should be noted that after the evaporator outer row 32 is frosted, there is a risk of frosting on the evaporator inner row 31. At this time, the opening of the first electronic expansion valve 41 is adjusted to control the temperature of the refrigerant entering the evaporator inner row 31. Generally, the larger the opening, the more refrigerant enters and the higher the temperature, and the outlet temperature increases faster. The outlet temperature of the evaporator inner row 31 is measured by the first sensor 310 to maintain Ta between (5, 10 ℃) to ensure that the evaporator inner row 31 will not frost.

[0060] As an example, in this embodiment, the heating system further comprises:

[0061] An inner fan is arranged on the air duct where the condenser 20 is located.

[0062] It should be noted that, since only the evaporator inner discharge 31 is evaporating and absorbing heat in the non-stop defrosting stage, the heating capacity will be significantly reduced. If the original air speed is still used for air supply, the user will obviously feel that the air temperature is reduced. Therefore, the speed of the inner air fan corresponding to the condenser 20 needs to be adjusted synchronously in the non-stop defrosting stage, so that the air temperature of the air outlet will not be too low, avoiding the situation that the user experience is poor.

[0063] In the embodiment, a heating system is provided, which overcomes the technical problems of heat exchange capacity reduction and compressor reliability in the non-stop defrosting scheme in the prior art. The heating system is improved in the embodiment. In the normal heating process, the phase separation technology is used to introduce the mixed refrigerant after heat exchange into the phase separator for gas-liquid separation. The liquid refrigerant separated from the phase separator enters the evaporator to continue heat exchange and then returns to the suction port of the compressor. The gaseous refrigerant separated from the phase separator directly enters the suction port of the compressor, which improves the return gas temperature and further improves the heating capacity of the heating system. In the non-stop defrosting process, the opening and closing states of each electronic expansion valve and switch are changed in the embodiment, so that the high-temperature gaseous refrigerant output by the compressor can be directly output to the evaporator outer discharge to help defrosting, while ensuring that the evaporator inner discharge will not frost. Combined with the adjustment of the speed of the inner air fan, the cold air blowing is prevented, and the air outlet temperature of the air outlet is ensured not to be significantly reduced, which improves the user experience in the non-stop defrosting stage, realizes the functions of evaporator inner discharge heat exchange and evaporator outer discharge defrosting.

[0064] Referring to Figure 2 , Figure 2 The hardware structure diagram related to the operation of an embodiment of the present application is shown.

[0065] As Figure 2As shown, the hardware can be an air conditioner, which can include a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between the components. The user interface 1003 can include a display, an input unit such as a keyboard, and can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 can be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.

[0066] Those skilled in the art can understand that Figure 2 The structure shown in the figure does not constitute a limitation on the air conditioner, and can include more or fewer components than the figure, or combine certain components, or different component arrangements.

[0067] As Figure 2 As shown, the memory 1005 as a storage medium can include an operating system, a data storage module, a network communication module, a user interface module, and a control program of the heating system.

[0068] In Figure 2 As shown in the air conditioner, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the air conditioner of the application can be arranged in the air conditioner, and the air conditioner calls the control program of the heating system stored in the memory 1005 through the processor 1001, and executes the related step operation of the defrosting control method of the heating system in the following embodiments.

[0069] The embodiment of the application also provides a defrosting control method of a heating system, which is applied to the above-mentioned heating system and air conditioner, and refers to Figure 3 , Figure 3 The flowchart of an embodiment of the defrosting control method of the heating system of the application.

[0070] In this embodiment, the defrosting control method of the heating system includes:

[0071] Step S10, obtaining the operation mode of the heating system;

[0072] It should be noted that the processor in the air conditioner containing the heating system is the execution subject in the embodiment. The operation mode of the heating system includes the heating mode and the defrosting mode. In the two modes, the condenser 20 serves as the condensing end and plays a role of condensing and dissipating heat for the refrigerant, and the evaporator 30 serves as the evaporating end and plays a role of evaporating and absorbing heat for the refrigerant.

[0073] Step S20, adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system, so that the heating system performs heating or defrosting.

[0074] As an example, in the embodiment, the step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system in step S20 includes: when the operation mode of the heating system is the heating mode, opening the first electronic expansion valve 41, the second switch 52 and the third switch 53, and closing the second electronic expansion valve 42 and the first switch 51.

[0075] It can be understood that when the heating system operates in the heating mode, the first electronic expansion valve 41, the second switch 52 and the third switch 53 need to be opened, and the second electronic expansion valve 42 and the first switch 51 need to be closed, so that the gaseous refrigerant discharged by the compressor 10 is directly delivered to the condenser 20 for heat dissipation and condensation, and then delivered to the evaporator inner discharge 31 through the first electronic expansion valve 41, and then evaporated and absorbed to obtain mixed refrigerant, and then delivered to the phase separator 40 through the second switch 52 for separation to obtain gaseous refrigerant and liquid refrigerant, and then the gaseous refrigerant is directly input to the compressor 10 for compression, and the liquid refrigerant is first input to the evaporator outer discharge 32 for re-evaporation and heat absorption to obtain gaseous refrigerant, and then input to the compressor 10 for compression, and then repeatedly circulated.

[0076] As an example, in the present embodiment, the step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operating mode of the heating system in step S20 further includes: when the operating mode of the heating system is the defrosting mode, opening the first electronic expansion valve 41, the second electronic expansion valve 42 and the first switch 51, and closing the second switch 52 and the third switch 53. The first outlet temperature of the evaporator outer row 32 is obtained; the opening degree of the second electronic expansion valve 42 is dynamically adjusted according to the first outlet temperature of the evaporator outer row 32, and the higher the first outlet temperature, the smaller the opening degree of the second electronic expansion valve 42. The second outlet temperature of the evaporator inner row 31 is obtained; the opening degree of the first electronic expansion valve 41 is dynamically adjusted according to the second outlet temperature of the evaporator inner row 31, and the higher the second outlet temperature, the smaller the opening degree of the first electronic expansion valve 41, and the rotating speed of the inner fan in the heating system is adjusted.

[0077] It can be understood that, after the heating system runs in the heating mode for a certain period of time, if the outdoor environment temperature is low, the evaporator outer row 32 will appear frosting phenomenon. In the present embodiment, whether the evaporator outer row 32 needs to be defrosted is judged in combination with the outlet temperature of the evaporator outer row 32 detected by the second sensor 320. When the heating system starts the defrosting function, the first electronic expansion valve 41, the second electronic expansion valve 42 and the first switch 51 are opened, and the second switch 52 and the third switch 53 are closed. The gaseous refrigerant discharged by the compressor 10 is partially delivered to the condenser 20, and partially delivered to the phase separator 40 through the second electronic expansion valve 42, and then delivered to the evaporator outer row 32. Since the part of the gaseous refrigerant is high-temperature and high-pressure gaseous refrigerant, it can help the evaporator outer row 32 to achieve significant defrosting effect, and the flow of the high-temperature gaseous refrigerant entering the evaporator outer row 32 is controlled by adjusting the opening degree of the second electronic expansion valve 42. The opening degree of the second electronic expansion valve 42 is dynamically adjusted according to the outlet temperature Tb of the evaporator outer row 32 measured by the second sensor 320 to achieve complete defrosting. The part of the gaseous refrigerant delivered to the condenser 20 is still subjected to the heat dissipation and condensation process, and then delivered to the refrigerant pipeline of the evaporator inner row 31 through the first electronic expansion valve 41 for heat absorption and evaporation. Since the liquid refrigerant input to the evaporator inner row 31 is not as much as in the normal heating condition, the evaporator inner row 31 has sufficient capacity to evaporate the part of the liquid refrigerant, and the output refrigerant is basically gaseous refrigerant, which does not need to be separated and can be directly delivered to the compressor 10 through the first switch 51 for compression and repeated circulation. That is, in the defrosting stage, the phase separator 40 no longer plays the role of gas-liquid separation, but plays the role of a gaseous refrigerant transfer station between the compressor 10 and the evaporator outer row 32.

[0078] It should be noted that after the evaporator outer row 32 is frosted, the evaporator inner row 31 also has the risk of frosting, at this time, the opening of the first electronic expansion valve 41 is adjusted to control the temperature of the refrigerant entering the evaporator inner row 31, generally speaking, the greater the opening, the more the refrigerant and the higher the temperature, the outlet temperature rises faster, and the outlet temperature Ta of the evaporator inner row 31 is measured by the first sensor 310, so that Ta is maintained between (5, 10℃), and it is ensured that the evaporator inner row 31 will not frost. In the embodiment, Tb>10℃ is considered to be defrosted clean. Since only the evaporator inner row 31 is evaporating and absorbing heat during the non-stop defrosting stage, the heating capacity will be significantly reduced. At this time, if the air is still sent at the original air speed, the user will obviously feel that the air temperature is reduced, so the air speed of the corresponding inner air fan of the condenser 20 needs to be adjusted synchronously during the non-stop defrosting stage, so that the air temperature of the air outlet is not too low, and the user experience is not poor.

[0079] In the embodiment, a defrosting control method of a heating system is provided, which overcomes the technical problems of heat exchange reduction and influence on compressor reliability in the non-stop defrosting scheme in the prior art. The heating system is improved in the embodiment. In the normal heating process, the phase separation technology is used to introduce the mixed refrigerant after heat exchange into the phase separator for gas-liquid separation. The liquid refrigerant is separated from the phase separator and then enters the evaporator to continue heat exchange and returns to the suction port of the compressor. The gaseous refrigerant is separated from the phase separator and then directly enters the suction port of the compressor, which improves the return gas temperature and further improves the heating capacity of the heating system. In the non-stop defrosting process, the opening and closing states of each electronic expansion valve and switch are changed in the embodiment, so that the high-temperature gaseous refrigerant output by the compressor can be directly output to the evaporator outer row to help defrost, and it is ensured that the evaporator inner row will not frost. By adjusting the speed of the inner air fan, cold air blowing is prevented, and the air outlet temperature of the air outlet is not significantly reduced, which improves the user experience during the non-stop defrosting stage and realizes the functions of evaporator inner row heat exchange and evaporator outer row defrosting.

[0080] In addition, the embodiment of the present application also provides a computer readable storage medium, and the computer readable storage medium stores a control program of a heating system. The control program of the heating system is executed by a processor to perform the related steps of any one of the defrosting control methods of the heating system as described above.

[0081] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0082] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0083] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be realized by means of software and the necessary general hardware platform, of course, they can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, and the air conditioner and the software product are stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) as described above, and include a plurality of instructions for causing a terminal device (which can be a mobile phone, an air conditioner, a server, an air conditioner, or a network device) to execute the methods described in the various embodiments of the present application.

[0084] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A heating system, characterized by, The heating system comprises: a compressor comprising an input end and an output end; a condenser, an input end of which is in communication with the output end of the compressor; an evaporator comprising an evaporator inner discharge and an evaporator outer discharge, an input end of the evaporator inner discharge being in communication with an output end of the condenser, a first electronic expansion valve being arranged between the condenser and the evaporator inner discharge; an output end of the evaporator inner discharge being in communication with the input end of the compressor, a first switch being arranged between the evaporator inner discharge and the compressor; an output end of the evaporator outer discharge being in communication with the input end of the compressor; a phase separator, input ends of the phase separator being in communication with the output end of the compressor and the output end of the evaporator inner discharge respectively, a second electronic expansion valve being arranged between the phase separator and the output end of the compressor, a second switch being arranged between the phase separator and the output end of the evaporator inner discharge; two output ends of the phase separator being in communication with the input end of the compressor and the input end of the evaporator outer discharge respectively, a third switch being arranged between the phase separator and the input end of the compressor; when the heating system starts heating, the first electronic expansion valve, the second switch and the third switch are opened, and the second electronic expansion valve and the first switch are closed; when the heating system starts defrosting, the first electronic expansion valve, the second electronic expansion valve and the first switch are opened, and the second switch and the third switch are closed.

2. The heating system of claim 1, wherein, The heating system further comprises: a first sensor arranged at the output end of the evaporator inner discharge for detecting the temperature of the output end of the evaporator inner discharge; a second sensor arranged at the output end of the evaporator outer discharge for detecting the temperature of the output end of the evaporator outer discharge.

3. The heating system of claim 1, wherein, The heating system further comprises: an inner fan arranged on an air duct where the condenser is located.

4. A defrosting control method of a heating system, characterized by, The defrosting control method of the heating system is applied to the heating system according to any one of claims 1-3, and the defrosting control method of the heating system comprises the following steps: obtaining the operation mode of the heating system; adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system, so that the heating system performs heating or defrosting.

5. The defrosting control method of a heating system according to claim 4, wherein The step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system comprises: when the operation mode of the heating system is the heating mode, opening the first electronic expansion valve, the second switch and the third switch, and closing the second electronic expansion valve and the first switch.

6. The defrosting control method of a heating system according to claim 5, wherein The step of adjusting the opening and closing states of the electronic expansion valves and switches in the heating system according to the operation mode of the heating system further comprises: when the operation mode of the heating system is the defrosting mode, opening the first electronic expansion valve, the second electronic expansion valve and the first switch, and closing the second switch and the third switch.

7. The defrosting control method of a heating system according to claim 6, wherein The step of closing the second switch and the third switch further comprises: obtaining the first outlet temperature of the evaporator outer discharge; The opening of the second electronic expansion valve is dynamically adjusted according to the first outlet temperature of the evaporator, and the higher the first outlet temperature, the smaller the opening of the second electronic expansion valve.

8. The defrosting control method of a heating system according to claim 6, wherein The step of closing the second switch and the third switch further comprises: acquiring a second outlet temperature of the evaporator; The opening of the first electronic expansion valve is dynamically adjusted according to the second outlet temperature of the evaporator, and the higher the second outlet temperature, the smaller the opening of the first electronic expansion valve, and the rotating speed of the internal air blower in the heating system is adjusted.

9. An air conditioner characterized by comprising: The air conditioner comprises the heating system according to any one of claims 1-3, a memory, a processor, and a control program of the heating system stored in the memory and executable on the processor, and the control program of the heating system, when executed by the processor, implements the steps of the defrosting control method of the heating system according to any one of claims 4-8.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium stores the control program of the heating system, and the control program of the heating system, when executed by the processor, implements the steps of the defrosting control method of the heating system according to any one of claims 4-8.

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