CN116518542A - Enhanced vapor injection control method and device, air conditioner and storage medium - Google Patents

Abstract

The application provides an enhanced vapor injection control method and device, an air conditioner and a storage medium, wherein the enhanced vapor injection control method comprises the following steps: acquiring the enthalpy-increasing superheat degree, the total supercooling degree, the exhaust superheat degree and the suction superheat degree of the enthalpy-increasing jet system when the enthalpy-increasing jet system is in an enthalpy-increasing jet heating mode; adjusting the opening of an enthalpy-increasing electronic expansion valve of the jet enthalpy-increasing system according to the relation between the enthalpy-increasing superheat degree and a first preset range; and adjusting the opening of the main electronic expansion valve of the jet enthalpy-increasing system according to at least one of the relation between the total supercooling degree and the second preset range, the relation between the exhaust superheat degree and the third preset range and the relation between the suction superheat degree and the fourth preset range. The double-valve opening of the enhanced vapor injection system is controlled based on the enhanced vapor injection degree of superheat, the total supercooling degree, the exhaust degree of superheat and the air suction degree of superheat, so that the enhanced vapor injection system can be ensured to stably, reliably and efficiently operate for a long time under the full working condition.

Description

Air injection enthalpy increase control method and device, air conditioner and storage medium

technical field

The present application relates to the technical field of air conditioning, in particular, to a method and device for controlling air injection enthalpy increase, an air conditioner and a storage medium.

Background technique

In recent years, low-temperature air-source heat pump cold (hot) water units (hereinafter referred to as: low-temperature heat pump) have been increasingly used in severe cold regions. Cryogenic heat pumps usually use a single-stage compression system or a two-stage compression system. For a single-stage compression system, when heating in an ultra-low temperature (for example, -35°C ~ -20°C) environment, the problem of excessive exhaust temperature is likely to occur, especially for a single-stage compression system with R32 working fluid. This problem is particularly serious. In addition, serious attenuation of heating capacity is also an inevitable problem in single-stage compressor systems. Therefore, low-temperature heat pumps that are extended to severe cold regions mostly use a two-stage compression system. However, for a two-stage compression system, the existing control strategy for increasing enthalpy by gas injection is likely to cause problems such as liquid on the suction side of the compressor affecting the reliability of the compressor, failure to extract liquid from the enthalpy increasing path, and failure of the enthalpy increasing path. Too little will lead to poor heating capacity, or too much mass flow in the enthalpy path will lead to poor energy efficiency of the compressor or even liquid hammer damage to the compressor.

Contents of the invention

The purpose of the embodiments of the present application is to provide a method for controlling enthalpy increase by gas injection, a device for controlling enthalpy increase by gas injection, an air conditioner and a storage medium, so as to improve problems caused by improper strategies for increasing enthalpy by gas injection in the prior art.

The present application provides a control method for increasing enthalpy by air injection, which is applied to an air-injection enthalpy increasing system of an air conditioner. The enthalpy-increasing superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree of the enthalpy-increasing system, the enthalpy-increasing superheat degree is the ratio of the economizer auxiliary road outlet temperature and the economizer auxiliary road inlet temperature of the gas injection enthalpy increasing system difference, the total subcooling degree is the difference between the saturation temperature of the condensing pressure and the outlet temperature of the main path of the economizer, and the superheat of the exhaust gas is the difference between the exhaust temperature of the gas injection enthalpy increasing system and the saturation temperature of the condensing pressure difference, the suction superheat is the difference between the suction temperature of the gas injection enthalpy increasing system and the saturation temperature of the evaporation pressure; adjust the gas injection enthalpy according to the relationship between the enthalpy increasing superheat and the first preset range The opening degree of the enthalpy-increasing electronic expansion valve of the system; according to the relationship between the total subcooling degree and the second preset range, the relationship between the exhaust superheat degree and the third preset range, and the suction superheat degree and the fourth preset range At least one of the three in the relationship of the preset range adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

The air injection enthalpy increase control method provided in this application controls the double valve opening of the air injection enthalpy increase system based on the enthalpy increase superheat, total subcooling, exhaust superheat and suction superheat, which helps to improve the existing Problems caused by improper gas injection enthalpy increase strategy in the technology, so as to ensure the long-term stable, reliable and energy-efficient operation of the gas injection enthalpy increase system under all working conditions.

In an embodiment, the adjusting the opening degree of the enthalpy-increasing electronic expansion valve of the air injection enthalpy increasing system according to the relationship between the enthalpy-increasing superheat degree and the first preset range includes: if the enthalpy-increasing superheat degree is within the specified range If the enthalpy-increasing superheat degree is less than the lower limit of the first preset range, then the opening degree of the enthalpy-increasing electronic expansion valve is maintained; The heat, the lower limit value of the first preset range and the first preset formula determine the first adjustment range, and reduce the opening of the enthalpy-increasing electronic expansion valve to the first adjustment range; if the increase If the degree of enthalpy and superheat is greater than the upper limit of the first preset range, then the second adjustment range is determined based on the degree of enthalpy-increased superheat, the upper limit of the first preset range, and a second preset formula, and The opening of the enthalpy-increasing electronic expansion valve is adjusted to increase the second adjustment range.

In one embodiment, the first preset formula is: (T _f2 -ΔT ₁ )/2, and the second preset formula is: (ΔT ₁ -T _f1 )/2, where ΔT ₁ is the For enthalpy-increased superheat, T _f1 is the upper limit of the first preset range, and T _f2 is the lower limit of the first preset range.

In an embodiment, according to the relationship between the total subcooling degree and the second preset range, the relationship between the exhaust superheat degree and the third preset range, and the relationship between the suction superheat degree and the fourth preset range At least one of the three relationships to adjust the opening of the main circuit electronic expansion valve of the gas injection enthalpy increasing system includes: if the total subcooling degree is less than the lower limit of the second preset range, based on the The total subcooling degree, the lower limit value of the second preset range and the third preset formula determine a third adjustment range, and reduce the opening of the main circuit electronic expansion valve by the third adjustment range; If the total subcooling degree is greater than the upper limit value of the second preset range, then determine a fourth adjustment based on the total subcooling degree, the upper limit value of the second preset range and a fourth preset formula range, and increase the opening degree of the main circuit electronic expansion valve to the fourth adjustment range; if the total subcooling degree is within the second preset range, according to the exhaust superheating degree and the first At least one of the relationship between the three preset ranges and the relationship between the suction superheat and the fourth preset range adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

In one embodiment, the third preset formula is: (T _sc2 -ΔT ₂ )/2, and the fourth preset formula is: (ΔT ₂ -T _sc1 )/2, where ΔT ₂ is the For the total subcooling degree, T _sc1 is the upper limit value of the second preset range, and T _sc2 is the lower limit value of the second preset range.

In an embodiment, the main function of the air injection enthalpy increasing system is adjusted according to at least one of the relationship between the degree of exhaust superheat and the third preset range and the relationship between the degree of superheat of the intake air and the fourth preset range. The opening degree of the electronic expansion valve, including: if the exhaust superheat degree is less than the lower limit value of the third preset range, based on the exhaust superheat degree, the lower limit value of the third preset range and the fifth preset formula to determine the fifth adjustment range, and reduce the opening degree of the main circuit electronic expansion valve by the fifth adjustment range; if the exhaust gas superheat is greater than the upper limit of the third preset range limit value, the sixth adjustment range is determined based on the exhaust superheat degree, the upper limit value of the third preset range and the sixth preset formula, and the opening degree of the main circuit electronic expansion valve is increased by a third Six adjustment ranges; if the exhaust superheat is within the third preset range, adjust the main circuit electronic expansion valve of the gas injection enthalpy increasing system according to the relationship between the suction superheat and the fourth preset range of the opening.

In one embodiment, the fifth preset formula is: (T _c2 -ΔT ₃ )/2, and the sixth preset formula is: (ΔT ₃ -T _c1 )/2, where ΔT ₃ is the For exhaust superheat, T _c1 is the upper limit of the third preset range, and T _c2 is the lower limit of the third preset range.

In an embodiment, the reducing the opening degree of the main circuit electronic expansion valve by the fifth adjustment range includes: if the opening degree of the main circuit electronic expansion valve reaches its minimum opening degree, reducing the opening degree of the main circuit electronic expansion valve The enthalpy-increasing electronic expansion valve increases the preset opening.

In an embodiment, the adjusting the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system according to the relationship between the suction superheat degree and the fourth preset range includes: if the suction superheat degree is less than the specified The lower limit value of the fourth preset range, the seventh adjustment range is determined based on the degree of suction superheat, the lower limit value of the fourth preset range, and the seventh preset formula, and the main circuit electronics The opening of the expansion valve decreases the seventh adjustment range; if the degree of suction superheat is greater than the upper limit value of the fourth preset range, based on the degree of suction superheat, the fourth preset range The upper limit value and the eighth preset formula determine the eighth adjustment range, and increase the opening of the main circuit electronic expansion valve by the eighth adjustment range; if the suction superheat is at the fourth preset If it is within the set range, the opening of the main circuit electronic expansion valve remains unchanged.

In one embodiment, the seventh preset formula is: (T _s2 -ΔT ₄ )/2, and the eighth preset formula is: (ΔT ₄ -T _s1 )/2, where ΔT ₄ is the absorption Gas superheat, T _s1 is the upper limit of the fourth preset range, and T _s2 is the lower limit of the fourth preset range.

In an embodiment, the method for controlling enthalpy increase by air injection further includes: obtaining the parameter value of the opening and closing decision parameter of enthalpy increase, and the opening and closing decision parameter of enthalpy increase includes outdoor ambient temperature, compressor frequency and compressor single cumulative running time ; If the parameter value of the enthalpy-increase switch decision parameter satisfies the first preset condition, turn on the enthalpy increase to enter the air injection enthalpy heating mode; if the parameter value of the enthalpy-increase switch decision parameter meets the first preset condition Two preset conditions, the enthalpy increase is turned off to exit the air injection enthalpy increase heating mode.

In an embodiment, the first preset condition includes: T _ring ≤ T _{to turn on enthalpy increase} , f>f _{to turn on enthalpy increase} , and t _comp >t _{to turn on enthalpy increase} , and the second preset condition is: T _ring ≤ T _{turns on the enthalpy increase} -T _buffer , or f>f _{turns on the enthalpy increase} -f _buffer , wherein, T _ring is the outdoor ambient temperature, T _{turns on the enthalpy increase} is the temperature that triggers the enthalpy increase; f is the air injection enthalpy increase system The compressor frequency of opening enthalpy; f _{opening enthalpy increase is the} frequency of the _compressor that triggers enthalpy increase; The cumulative duration of times, T _buffer and f _buffer are constant.

In one embodiment, if the parameter value of the enthalpy-increasing opening and closing decision parameter satisfies the first preset condition, then turning on enthalpy-increasing to enter the air-injection enthalpy-increasing heating mode includes: obtaining the outlet water temperature, based on the set The outdoor ambient temperature, the outlet water temperature and the preset table determine the first target opening degree of the main circuit electronic expansion valve and the second target opening degree of the enthalpy-increasing electronic expansion valve; the main circuit electronic expansion valve The opening degree of the enthalpy-increasing electronic expansion valve is adjusted to the second target opening degree.

In one embodiment, if the parameter value of the enthalpy-increasing switch decision parameter satisfies the second preset condition, then turning off the enthalpy-increasing mode to exit the air injection enthalpy-increasing heating mode includes: if f>f, _{turning on the increasing enthalpy Enthalpy} , the frequency of the compressor is reduced to f _{to open enthalpy increase} -f _buffer , if f≤f _{open enthalpy increase} , then keep the compressor frequency unchanged; after a preset time period, close the enthalpy increase electronic expansion valve.

In an embodiment, after closing the enthalpy-increasing electronic expansion valve after a preset period of time, the method for controlling enthalpy-increasing gas injection further includes: obtaining the exhaust gas temperature of the gas-injecting enthalpy-increasing system; If the temperature is higher than the preset temperature, increase the preset opening of the main circuit electronic expansion valve; if the exhaust gas temperature is less than or equal to the preset temperature, then maintain the opening of the main circuit electronic expansion valve. Change.

The present application also provides an air injection enthalpy increase control device, including: an acquisition module, configured to obtain the enthalpy increase superheat and total subcooling of the air injection enthalpy increase system when the air injection enthalpy increase system is in the air injection enthalpy increase heating mode degree, exhaust superheat degree and suction superheat degree, the enthalpy-increased superheat degree is the difference between the economizer auxiliary road outlet temperature and the economizer auxiliary road inlet temperature of the gas injection enthalpy-increasing system, and the total subcooling degree is the condensing pressure The difference between the saturation temperature and the outlet temperature of the main path of the economizer, the exhaust superheat is the difference between the exhaust temperature of the gas injection enthalpy increasing system and the saturation temperature of the condensing pressure, and the suction superheat is the The difference between the suction temperature of the air injection enthalpy increasing system and the saturation temperature of the evaporation pressure; an adjustment module, used to adjust the enthalpy increasing electronic expansion valve of the air injection enthalpy increasing system according to the relationship between the enthalpy increasing superheat degree and the first preset range and according to the relationship between the total subcooling degree and the second preset range, the relationship between the exhaust superheat degree and the third preset range and the relationship between the suction superheat degree and the fourth preset range At least one of them adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

The present application also provides an air conditioner, including an air injection enthalpy increasing system, a processor and a memory, the processor is connected to the air injection enthalpy increasing system and the memory respectively, and computer readable instructions are stored in the memory, The processor invokes the stored instructions and executes the method for controlling enthalpy increase by gas injection as described above.

The present application also provides a storage medium storing computer-readable instructions, and the computer-readable instructions are invoked by a processor to implement the aforementioned control method for gas injection enthalpy increase.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present application will be apparent from the description, drawings and claims.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings that need to be used in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, so It should not be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings according to these drawings without creative work.

Fig. 1 is a schematic structural diagram of a gas injection enthalpy increasing system provided by an embodiment of the present application.

Fig. 2 is a flowchart of a method for controlling enthalpy increase by gas injection provided by an embodiment of the present application.

Fig. 3 is a structural block diagram of a gas injection enthalpy increase control device provided by an embodiment of the present application.

Icons: compressor-11; reversing element-12; first heat exchanger-13; economizer-14; second heat exchanger-15; gas-liquid separator-16; Enthalpy electronic expansion valve-18; suction end-111; enthalpy increasing end-112; exhaust end-113; first end-121; second end-122; third end-123; Road entrance-141; main road exit-142; auxiliary road entrance-143; auxiliary road exit-144; low pressure pressure sensor-101; suction temperature sensor-102; exhaust temperature sensor-103; high pressure pressure sensor-104; Sensor-105; auxiliary road outlet temperature sensor-106; subcooling temperature sensor-107; air injection enthalpy increase control device-20; acquisition module-21; adjustment module-22.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

An embodiment of the present application provides a method for controlling enthalpy-increasing by air injection, which is applied to an air-injection enthalpy increasing system of an air conditioner. In some embodiments, the air injection enthalpy increasing system may be a part of the two-stage compression system of the air conditioner. Exemplarily, the structure of the gas injection enthalpy increasing system may be roughly as shown in FIG. 1 .

In the embodiment shown in Figure 1, the gas injection enthalpy increasing system includes a compressor 11, a reversing element 12, a first heat exchanger 13, an economizer 14, a second heat exchanger 15, a gas-liquid separator 16, and a main circuit electronic expansion Valve 17 and enthalpy electronic expansion valve 18.

The compressor 11 includes a discharge end 113 , a suction end 111 and an enthalpy increasing end 112 . The exhaust end 113 communicates with the reversing element 12 . The suction end 111 communicates with the gas-liquid separator 16 . The enthalpy increasing end 112 communicates with the outlet of the auxiliary path of the economizer 14 .

The reversing element 12 includes a first end 121 , a second end 122 , a third end 123 and a fourth end 124 . The first end 121 communicates with the exhaust end 113 . The second end 122 communicates with the second heat exchanger 15 . The third end 123 communicates with the gas-liquid separator 16 . The fourth end 124 communicates with the first heat exchanger 13 . In some embodiments, the reversing element 12 can be a four-way valve.

One end of the first heat exchanger 13 communicates with the fourth end 124 , and the other end communicates with the economizer 14 . The first heat exchanger 13 may be a water-side heat exchanger, and in this case, the first heat exchanger 13 is also used to communicate with the waterway.

The economizer 14 includes a main road entrance 141 , a main road exit 142 , an auxiliary road entrance 143 and an auxiliary road exit 144 . The main road inlet 141 communicates with the first heat exchanger 13 . The main path outlet 142 communicates with the second heat exchanger 15 . The auxiliary path entrance 143 communicates with the main path exit 142 and the second heat exchanger 15 . The auxiliary path outlet 144 communicates with the enthalpy increasing end 112 . The economizer 14 may be a board-for-economizer.

One end of the second heat exchanger 15 communicates with the second end 122 , and the other end communicates with the main channel outlet 142 and the auxiliary channel inlet 143 respectively. The second heat exchanger 15 may be a finned tube heat exchanger.

The main path electronic expansion valve 17 is arranged between the second heat exchanger 15 and the main path outlet 142 . Specifically, the main circuit electronic expansion valve 17 is arranged on the main pipeline between the second heat exchanger 15 and the main channel outlet 142 .

The enthalpy-increasing electronic expansion valve 18 is arranged on a branch pipeline that communicates with the auxiliary pipeline inlet 143 and the main pipeline.

For the air injection enthalpy increasing system shown in Figure 1, the flow direction of the system medium in the case of cooling is: compressor 11—reversing element 12—second heat exchanger 15—economizer 14—first heat exchanger 13—reversing element 14—gas-liquid separator 16—compressor 11; the flow direction of the system medium in the case of heating is: compressor 11—reversing element 12—first heat exchanger 13—economizer 14—second heat exchanger 15—exchanger Direction member 12—gas-liquid separator 16—compressor 11; in the case of enthalpy increase, the enthalpy increase medium flows into the compressor 11 through the auxiliary outlet 144 of the economizer 14 and the enthalpy increase end 112 of the compressor 11.

In the embodiment shown in Fig. 1, the air injection enthalpy increasing system also includes a low-pressure pressure sensor 101, an intake air temperature sensor 102, an exhaust temperature sensor 103, a high-pressure pressure sensor 104, an auxiliary road inlet temperature sensor 105, an auxiliary road outlet temperature sensor 106 and a Cold temperature sensor 107.

Both the low-pressure pressure sensor 101 and the suction temperature sensor 102 are disposed on the pipeline connecting the third end 123 and the gas-liquid separator 16 , and the low-pressure pressure sensor 101 is closer to the gas-liquid separator 16 than the suction temperature sensor 102 . The low-pressure pressure sensor 101 is used to detect the evaporation pressure saturation temperature T _ps of the gas injection enthalpy increasing system. The intake air temperature sensor 102 is used to detect the intake air temperature T _s of the gas injection enthalpy increasing system.

Both the exhaust temperature sensor 103 and the high pressure sensor 104 are disposed on the pipeline between the exhaust end 113 and the first end 121 , and the exhaust temperature sensor 103 is closer to the exhaust end 113 than the high pressure sensor 104 . The exhaust temperature sensor 103 is used to detect the exhaust gas temperature T _c of the gas injection enthalpy system, and the high pressure sensor 104 is used to detect the condensing pressure saturation temperature T _pc of the gas injection enthalpy system.

The temperature sensor 105 at the inlet of the auxiliary channel is arranged on the branch pipeline connecting the inlet 143 of the auxiliary channel with the main pipeline, and is closer to the inlet 143 of the auxiliary channel than the electronic expansion valve 18 for increasing enthalpy. The auxiliary road inlet temperature sensor 105 is used to detect the auxiliary road inlet temperature T _fi .

The auxiliary path outlet temperature sensor 106 is arranged on the pipeline between the auxiliary path outlet 144 and the enthalpy increasing end 112 , and is arranged close to the auxiliary path outlet 144 . The auxiliary road outlet temperature sensor 106 is used to detect the auxiliary road outlet temperature T _fo .

The subcooling temperature sensor 107 is arranged on the main pipeline between the second heat exchanger 15 and the outlet 142 of the main passage, and is arranged close to the outlet 142 of the main passage. The subcooling temperature sensor 107 is used to detect the total subcooling temperature T _sc of the gas injection enthalpy increasing system (ie, the temperature at the outlet of the main path of the economizer).

In addition, for the gas injection enthalpy system, exhaust superheat △T ₁ = exhaust temperature T _c - condensing pressure saturation temperature T _pc ; suction superheat △ T ₂ = suction temperature T _s - evaporation pressure saturation temperature T _ps ; enthalpy-increasing superheat △T ₃ = auxiliary road outlet temperature T _fo - auxiliary road inlet temperature T _fi ; total subcooling degree △ T4 = condensing pressure saturation temperature T _pc -T _sc .

It can be understood that the gas injection enthalpy increasing system here is only an example, and the present application is not limited thereto. In other embodiments, the gas injection enthalpy increasing system may also have other structures.

Please refer to FIG. 2 , in some embodiments, the method for controlling enthalpy increase by gas injection includes the following steps.

Step S11 , when the air injection enthalpy increasing system is in the air injection enthalpy increasing heating mode, obtain the enthalpy increasing superheat degree, the total subcooling degree, the exhaust superheat degree and the intake air superheat degree of the air injection enthalpy increasing system. Enthalpy-increased superheat is the difference between the outlet temperature of the economizer auxiliary path and the inlet temperature of the economizer auxiliary path of the gas injection enthalpy-increasing system. The total subcooling degree is the difference between the saturation temperature of the condensing pressure and the outlet temperature of the main path of the economizer. The exhaust superheat is the difference between the exhaust temperature of the gas injection enthalpy increasing system and the saturation temperature of the condensing pressure. The suction superheat is the difference between the suction temperature of the gas injection enthalpy increasing system and the saturation temperature of the evaporating pressure.

In some embodiments, when the air injection enthalpy increasing system is in the air injection enthalpy increasing heating mode, the vapor pressure saturation temperature T _ps of the air injection enthalpy increasing system can be detected first by the low pressure pressure sensor 101; the air injection enthalpy increasing system can be detected by the suction temperature sensor 102 Detect the exhaust gas temperature T _c of the gas injection enthalpy increasing system through the exhaust temperature sensor ₁₀₃ ; detect the condensing pressure saturation temperature T _pc of the gas injection enthalpy increasing system through the high pressure pressure sensor 104 ; detect through the auxiliary road inlet temperature sensor 105 The auxiliary road inlet temperature T _fi ; the auxiliary road outlet temperature T _fo is detected by the auxiliary road outlet temperature sensor 106; the total subcooling temperature T _sc of the gas injection enthalpy increasing system is detected by the subcooling degree temperature sensor 107; then, based on the detected parameter value and enthalpy increase Calculation formula of superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree calculate the enthalpy increasing superheat degree, total subcooling degree and exhaust superheat degree of air injection enthalpy increasing system respectively and suction superheat.

Step S12, adjusting the opening degree of the enthalpy-increasing electronic expansion valve of the air injection enthalpy-increasing system according to the relationship between the enthalpy-increasing superheat degree and the first preset range.

In some embodiments, step S12 may include: if the enthalpy-increasing superheat degree is within the first preset range, maintaining the opening of the enthalpy-increasing electronic expansion valve; if the enthalpy-increasing superheat degree is less than the lower limit of the first preset range value, the first adjustment range is determined based on the enthalpy-increasing superheat degree, the lower limit of the first preset range, and the first preset formula, and the opening of the enthalpy-increasing electronic expansion valve is reduced by the first adjustment range; if the enthalpy-increasing If the degree of superheat is greater than the upper limit of the first preset range, the second adjustment range is determined based on the enthalpy-increased superheat, the upper limit of the first preset range, and the second preset formula, and the opening of the enthalpy-increased electronic expansion valve increase the second adjustment range.

In some embodiments, the first preset formula can be: (Tf2-ΔT1)/2, and the second preset formula can be: (ΔT1-Tf1)/2, where ΔT1 is the degree of enthalpy-increased superheat, and Tf1 is the first The upper limit of the preset range, Tf2 is the lower limit of the first preset range.

Step S13, according to at least one of the relationship between the total subcooling degree and the second preset range, the relationship between the exhaust superheat degree and the third preset range, and the relationship between the intake air superheat degree and the fourth preset range The opening degree of the main circuit electronic expansion valve of the enthalpy increasing system.

In some embodiments, step S13 may include: if the total subcooling degree is less than the lower limit value of the second preset range, then determine the first subcooling degree based on the total subcooling degree, the lower limit value of the second preset range and the third preset formula. Three adjustment ranges, and reduce the opening of the main circuit electronic expansion valve by the third adjustment range; if the total subcooling degree is greater than the upper limit value of the second preset range, based on the total subcooling degree and the The upper limit value and the fourth preset formula determine the fourth adjustment range, and increase the opening of the main circuit electronic expansion valve by the fourth adjustment range; if the total subcooling degree is within the second preset range, then according to the exhaust process At least one of the relationship between the heat degree and the third preset range and the relationship between the degree of suction superheat and the fourth preset range adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

In one embodiment, the third preset formula can be: (Tsc2-ΔT2)/2, and the fourth preset formula can be: (ΔT2-Tsc1)/2, where ΔT2 is the total subcooling degree, and Tsc1 is the second The upper limit of the preset range, Tsc2 is the lower limit of the second preset range.

In some embodiments, the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system is adjusted according to at least one of the relationship between the degree of exhaust superheat and the third preset range and the relationship between the degree of superheat of the intake air and the fourth preset range, Including: if the exhaust superheat is less than the lower limit of the third preset range, the fifth adjustment range is determined based on the exhaust superheat, the lower limit of the third preset range and the fifth preset formula, and the main circuit The opening of the electronic expansion valve is reduced by the fifth adjustment range; if the exhaust superheat is greater than the upper limit of the third preset range, based on the exhaust superheat, the upper limit of the third preset range and the sixth preset The formula determines the sixth adjustment range, and increases the opening of the main circuit electronic expansion valve by the sixth adjustment range; if the exhaust superheat is within the third preset range, according to the relationship between the suction superheat and the fourth preset range Adjust the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

In an embodiment, the fifth preset formula may be: (Tc2-ΔT3)/2, and the sixth preset formula may be: (ΔT3-Tc1)/2, where ΔT3 is the degree of exhaust superheat, and Tc1 is the third The upper limit of the preset range, Tc2 is the lower limit of the third preset range.

In one embodiment, reducing the opening of the main circuit electronic expansion valve by the fifth adjustment range includes: increasing the opening of the enthalpy-increasing electronic expansion valve to a preset value if the opening of the main circuit electronic expansion valve reaches its minimum opening. Spend.

In some embodiments, adjusting the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system according to the relationship between the degree of superheat of the suction air and the fourth preset range includes: if the degree of superheat of the suction air is less than the lower limit of the fourth preset range , the seventh adjustment range is determined based on the degree of suction superheat, the lower limit of the fourth preset range, and the seventh preset formula, and the opening of the main circuit electronic expansion valve is reduced by the seventh adjustment range; If the heat is greater than the upper limit of the fourth preset range, the eighth adjustment range is determined based on the degree of suction superheat, the upper limit of the fourth preset range, and the eighth preset formula, and the opening degree of the main circuit electronic expansion valve Increase the eighth adjustment range; if the suction superheat is within the fourth preset range, keep the opening of the main circuit electronic expansion valve unchanged.

In an embodiment, the seventh preset formula may be: (Ts2-ΔT4)/2, and the eighth preset formula may be: (ΔT4-Ts1)/2, where ΔT4 is the degree of suction superheat, and Ts1 is the fourth The upper limit of the preset range, Ts2 is the lower limit of the fourth preset range.

It should be noted that step S12 and step S13 are in no particular order, that is, step S12 may be performed prior to step S13, or step S12 may be performed later than step S13, or step S12 may be performed synchronously with step S13.

The air injection enthalpy increase control method provided in the embodiment of the present application controls the double valve opening of the air injection enthalpy increase system based on the enthalpy increase superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree, which helps to improve Problems caused by improper gas injection enthalpy increase strategy in the prior art make the compressor continuously reliable when the gas injection enthalpy increase system is running freely, reducing the risk of liquid hammer on the suction side and enthalpy increase side; when the gas injection enthalpy increase system is running freely The exhaust temperature is controlled stably, avoiding the frequency reduction of the compressor and damage to the compressor caused by the exhaust temperature being too high; under the ultra-low external ambient temperature, it is ensured that the enthalpy-increasing auxiliary path can successfully extract liquid and improve the enthalpy-increasing effect; and the quality of the enthalpy-increasing auxiliary path is improved. The flow rate is controllable, adapting to different working conditions to control the refrigerant state (two-phase state, saturated state, superheated state) at the enthalpy increasing port of the compressor, so as to achieve better energy efficiency and enthalpy increasing effect, so as to ensure that the air injection enthalpy increasing system works under all working conditions Long-term stable, reliable and energy-efficient operation.

It can be understood that after adjusting the opening of the main circuit electronic expansion valve and/or after adjusting the opening of the enthalpy increasing electronic expansion valve, the gas injection enthalpy increasing system needs to run for a period of time before it can reach the steady state after adjusting the opening , therefore, step S11, step S12 and step S13 can be cycled periodically to continuously detect whether the gas injection enthalpy system is operating in the optimal operating mode close to the current working condition, and when the gas injection system is not operating at the optimum When the optimal operation mode is running, the gradual adjustment makes the gas injection enthalpy increasing system approach to the optimal operating mode, thereby further improving the problems caused by the improper gas injection enthalpy increasing strategy in the prior art, thereby further ensuring the gas injection enthalpy increasing system Long-term stable, reliable and energy-efficient operation under all working conditions.

Specifically, in step S11, for the evaporation pressure saturation temperature T _ps , suction temperature T _s , exhaust temperature T _c , condensation pressure saturation temperature T _pc , auxiliary path inlet temperature T _fi , and auxiliary path outlet temperature T _fo , any parameter value in the total subcooling temperature T _sc can be detected periodically.

Exemplarily, for each time the air injection enthalpy increasing heating mode is entered, the evaporation pressure saturation temperature T _ps , the suction temperature T _s , the exhaust temperature T _c , the condensing pressure saturation temperature T _pc , and the auxiliary path inlet temperature of the air injection enthalpy increasing system The first detection of T _fi , auxiliary channel outlet temperature T _fo , and total subcooling temperature T _sc may start after a first preset time period has elapsed since entering the air injection enthalpy heating mode. For the non-initial detection of the auxiliary channel inlet temperature T _fi and the auxiliary channel outlet temperature T _fo of the air injection enthalpy increasing system in the heating mode of increasing enthalpy by air injection, it can be performed after each adjustment of the opening degree of the electronic expansion valve for increasing enthalpy. Start after the second preset duration. For the non-first detection of the evaporation pressure saturation temperature T _ps and suction temperature T _s of the air injection enthalpy system in the air injection enthalpy heating mode, or for the exhaust temperature T _c and condensing pressure saturation in the air injection enthalpy heating mode The non-initial detection of the temperature T _pc , or the non-initial detection of the total subcooling temperature T _sc in the mode of air injection enthalpy heating, can be performed after adjusting the opening degree of the electronic expansion valve of the main circuit every time. Starts after the third preset duration.

It can be understood that the first preset duration, the second preset duration, and the third preset duration can be the same, so that the main circuit can be adjusted according to the enthalpy-increased superheat degree, the total subcooling degree, the exhaust superheat degree and the suction superheat degree at the same time. The opening of the electronic expansion valve and the enthalpy-increasing electronic expansion valve are controlled. Certainly, the first preset duration, the second preset duration, and the third preset duration may also be set to different durations as required.

Correspondingly, the calculation of the enthalpy-increasing superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree of the gas injection enthalpy increasing system can also be performed periodically, for example, each time the evaporation of the gas injection enthalpy increasing system is obtained After the parameter values of pressure saturation temperature T _ps , suction temperature T _s , exhaust temperature T _c , condensing pressure saturation temperature T _pc , auxiliary road inlet temperature T _fi , auxiliary road outlet temperature T _fo , and total subcooling temperature T _sc , you can According to these parameter values, the enthalpy-increasing superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree of the air injection enthalpy-increasing system are calculated.

Correspondingly, step S12 and/or step S13 may be executed after calculating the enthalpy-increasing superheat degree, total subcooling degree, exhaust superheat degree and intake air superheat degree of the gas injection enthalpy increasing system each time.

It should be noted that the opening degree of the enthalpy-increasing electronic expansion valve of the gas injection enthalpy increasing system is adjusted according to the relationship between the degree of enthalpy-increasing superheat and the first preset range, and the opening degree of the electronic expansion valve of the main circuit is adjusted according to the relationship between the total subcooling degree and the second preset range. The opening degree of the expansion valve, adjusting the opening degree of the main circuit electronic expansion valve according to the relationship between the exhaust superheat degree and the third preset range, and adjusting the opening degree of the main circuit electronic expansion valve according to the relationship between the suction superheat degree and the fourth preset range The four openings can have different priorities. Specifically, the order of priority from high to low is as follows: adjust the opening degree of the main circuit electronic expansion valve according to the relationship between the total subcooling degree and the second preset range; adjust according to the relationship between the exhaust superheat degree and the third preset range The opening degree of the main circuit electronic expansion valve; adjust the opening degree of the main circuit electronic expansion valve according to the relationship between the suction superheat degree and the fourth preset range; adjust the air injection enthalpy increasing system according to the relationship between the enthalpy increasing superheat degree and the first preset range The opening degree of the enthalpy increasing electronic expansion valve.

In some embodiments, the method for controlling enthalpy increase by injection may further include: obtaining the parameter value of the opening and closing decision parameter of enthalpy increase; The air injection enthalpy heating mode; if the parameter value of the enthalpy opening and closing decision parameter meets the second preset condition, the enthalpy increase is turned off to exit the air injection enthalpy heating mode.

In one embodiment, the parameters for determining the opening and closing of enthalpy increase include the outdoor ambient temperature, the frequency of the compressor, and the accumulative single running time of the compressor. It should be noted that the single accumulative running time of the compressor refers to the accumulative running time of the compressor after each start-up of the air conditioner. It can be understood that how to obtain the outdoor ambient temperature, the frequency of the compressor, and the accumulative running time of the compressor can refer to the existing technology, and this application will not introduce it.

In one embodiment, the first preset condition includes: T _ring ≤ T _{to start enthalpy increase} , f>f _{to start enthalpy increase} , and t _comp >t _{to start enthalpy increase} , and the second preset condition is: T _ring ≤ T _{to start enthalpy increase} -T _buffer , or f>f _{to turn on enthalpy increase} -f _buffer , wherein, T _{ring is} the outdoor ambient temperature, T _{turn on enthalpy increase} is the temperature that triggers enthalpy increase; f is the compressor frequency of the air injection enthalpy increase system; _Enthalpy is the frequency of the compressor that triggers the enthalpy increase, t _comp is the single cumulative running time of the compressor in the air injection enthalpy increase system, t _{start enthalpy is} the single cumulative time of the compressor that triggers the enthalpy increase, T _buffer and f _buffer are constant. Exemplarily, the value of T _{start-up enthalpy} can be between -5°C and 10°C; the value of f _{start-up enthalpy} can be between 30Hz and 60Hz; the value of t _{start-up enthalpy} can be between 3min and 10min The value of T _buffer is between 5°C and 15°C; the value of f _buffer is between 5Hz and 20Hz.

In some embodiments, if the parameter value of the opening and closing decision parameter of enthalpy increase satisfies the first preset condition, the enthalpy increase is turned on to enter the air injection enthalpy increase heating mode, which may include: obtaining the outlet water temperature, based on the outdoor ambient temperature, the outlet water temperature and The preset table determines the first target opening degree of the main circuit electronic expansion valve and the second target opening degree of the enthalpy-increasing electronic expansion valve; adjusts the opening degree of the main circuit electronic expansion valve to the first target opening degree; The opening degree of the valve is adjusted to the second target opening degree. Among them, the preset table records the optimal main circuit electronic expansion valve opening and the optimal enthalpy-enhancing electronic expansion valve opening under different outdoor ambient temperatures and different outlet water temperatures. That is to say, the preset table records the outdoor environment Corresponding relationship between temperature, outlet water temperature, optimal main circuit electronic expansion valve opening, and optimal enthalpy-enhancing electronic expansion valve opening. When the outdoor ambient temperature and outlet water temperature are determined, the optimal main circuit electronic expansion valve opening and the optimal enthalpy-increasing electronic expansion valve opening corresponding to the outdoor ambient temperature and outlet water temperature can be set to ensure the increase of enthalpy by air injection The system can have better energy efficiency, stable operation of exhaust temperature and no liquid-filled compression of the compressor.

It should be noted that the specific way of obtaining the outlet water temperature can refer to the prior art, and this application will not introduce it further.

In an embodiment, adjusting the opening degree of the main circuit electronic expansion valve to the first target opening degree and adjusting the opening degree of the enthalpy increasing electronic expansion valve to the second target opening degree may be performed according to a preset sequence. For example, the opening of the enthalpy-increasing electronic expansion valve may be adjusted to the second target opening first, and the opening of the main circuit electronic expansion valve may be adjusted to the first target opening after a preset period of time.

In one embodiment, if the parameter value of the opening and closing decision parameter of enthalpy increase satisfies the second preset condition, the enthalpy increase is turned off to exit the air injection enthalpy increase heating mode, including: if f>f, the enthalpy _{increase is turned on} , and the compressor frequency is set to _{Turn on the enthalpy increase} -f _buffer until f, if f≤f _{turn on the enthalpy increase} , keep the compressor frequency unchanged; close the enthalpy increase electronic expansion valve after the preset time period.

In an embodiment, after closing the enthalpy-increasing electronic expansion valve after a preset period of time, the control method for increasing enthalpy by gas injection may further include: obtaining the exhaust gas temperature of the gas-injection enthalpy increasing system; if the exhaust gas temperature is greater than the preset temperature, the main The electronic expansion valve of the main circuit increases the preset opening degree, and if the exhaust gas temperature is less than or equal to the preset temperature, the opening degree of the electronic expansion valve of the main circuit remains unchanged.

It can be understood that the air injection enthalpy increasing system can also turn off the enthalpy increasing when it is determined to enter the defrosting mode.

Please refer to Fig. 3, based on the same inventive concept, the embodiment of the present application also provides a gas injection enthalpy increase control device 20, including: an acquisition module 21, which is used to obtain the gas injection enthalpy increase heating mode when the gas injection enthalpy increase system is in the gas injection enthalpy heating mode Enthalpy-increased superheat, total subcooling, exhaust superheat and suction superheat of the system, enthalpy-increased superheat is the difference between the outlet temperature of the economizer auxiliary road and the inlet temperature of the economizer auxiliary road of the gas injection enthalpy system, and the total subcooling degree is the difference between the condensing pressure saturation temperature and the outlet temperature of the main road of the economizer; The difference between the suction temperature and the evaporation pressure saturation temperature; the adjustment module 22 is used to adjust the opening degree of the enthalpy electronic expansion valve of the air injection enthalpy increasing system according to the relationship between the enthalpy increasing superheat degree and the first preset range; and according to the overall At least one of the relationship between the degree of subcooling and the second preset range, the relationship between the degree of exhaust superheat and the third preset range, and the relationship between the degree of suction superheat and the fourth preset range adjusts the main function of the air injection enthalpy increasing system. The opening degree of the electronic expansion valve.

In some embodiments, the regulating module 22 is used to maintain the opening of the enthalpy increasing electronic expansion valve when the enthalpy increasing superheat degree is within the first preset range; when the enthalpy increasing superheat degree is less than When the lower limit of the first preset range is reached, the first adjustment range is determined based on the enthalpy-increased superheat degree, the lower limit of the first preset range and the first preset formula, and the enthalpy-increased The opening of the electronic expansion valve is reduced by the first adjustment range; and when the enthalpy-increased superheat degree is greater than the upper limit value of the first preset range, The upper limit value of the range and the second preset formula determine the second adjustment range, and the opening degree of the enthalpy-increasing electronic expansion valve is increased by the second adjustment range.

In some embodiments, the first preset formula is: (T _f2 -ΔT ₁ )/2, and the second preset formula is: (ΔT ₁ -T _f1 )/2, where ΔT ₁ is the For enthalpy-increased superheat, T _f1 is the upper limit of the first preset range, and T _f2 is the lower limit of the first preset range.

In some embodiments, the adjustment module 22 is configured to, when the total subcooling degree is less than the lower limit value of the second preset range, based on the total subcooling degree and the lower limit value of the second preset range And the third preset formula determines the third adjustment range, and reduces the opening degree of the main circuit electronic expansion valve by the third adjustment range; when the total subcooling degree is greater than the second preset range limit value, based on the total subcooling degree, the upper limit value of the second preset range, and a fourth preset formula to determine a fourth adjustment range, and increase the opening of the main circuit electronic expansion valve by the a fourth adjustment range; and when the total subcooling degree is within the second preset range, according to the relationship between the exhaust superheat degree and the third preset range and the suction superheat degree and the fourth preset At least one of the range relationships adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system.

In some embodiments, the third preset formula is: (T _sc2 -ΔT ₂ )/2, and the fourth preset formula is: (ΔT ₂ -T _sc1 )/2, wherein ΔT ₂ is the For the total subcooling degree, T _sc1 is the upper limit value of the second preset range, and T _sc2 is the lower limit value of the second preset range.

In some embodiments, the adjustment module 22 is configured to be based on the exhaust superheat degree, the lower limit value of the third preset range and The fifth preset formula determines the fifth adjustment range, and reduces the opening degree of the main circuit electronic expansion valve by the fifth adjustment range; when the exhaust gas superheat is greater than the upper limit of the third preset range value, the sixth adjustment range is determined based on the exhaust superheat degree, the upper limit value of the third preset range and the sixth preset formula, and the opening degree of the main circuit electronic expansion valve is increased by a sixth adjustment range; and when the degree of superheat of the exhaust gas is within the third preset range, adjusting the main circuit electronic expansion valve of the gas injection enthalpy increasing system according to the relationship between the degree of superheat of the suction air and the fourth preset range of the opening.

In some embodiments, the fifth preset formula is: (T _c2 -ΔT ₃ )/2, and the sixth preset formula is: (ΔT ₃ -T _c1 )/2, where ΔT ₃ is the For exhaust superheat, T _c1 is the upper limit of the third preset range, and T _c2 is the lower limit of the third preset range.

In some embodiments, the adjustment module 22 is further configured to increase the preset opening degree of the enthalpy-increasing electronic expansion valve when the opening degree of the main circuit electronic expansion valve reaches its minimum opening degree.

In some embodiments, the adjustment module 22 is further configured to, when the degree of suction superheat is less than the lower limit of the fourth preset range, based on the degree of suction superheat and the lower limit of the fourth preset range value and the seventh preset formula to determine the seventh adjustment range, and reduce the opening of the main circuit electronic expansion valve by the seventh adjustment range; when the suction superheat is greater than the fourth preset range When the upper limit value is reached, the eighth adjustment range is determined based on the degree of suction superheat, the upper limit value of the fourth preset range and the eighth preset formula, and the opening degree of the main circuit electronic expansion valve is increased the eighth adjustment range; and when the degree of suction superheat is within the fourth preset range, maintaining the opening degree of the main circuit electronic expansion valve unchanged.

In some embodiments, the seventh preset formula is: (T _s2 -ΔT ₄ )/2, and the eighth preset formula is: (ΔT ₄ -T _s1 )/2, where ΔT ₄ is the suction Gas superheat, T _s1 is the upper limit of the fourth preset range, and T _s2 is the lower limit of the fourth preset range.

In some embodiments, the obtaining module 21 is also used to obtain the parameter value of the opening and closing decision parameters of the enthalpy increase, and the opening and closing decision parameters of the enthalpy increase include the outdoor ambient temperature, the frequency of the compressor, and the single cumulative running time of the compressor; the adjustment module 22 It is also used to turn on the enthalpy increase to enter the heating mode of the air injection enthalpy increase when the parameter value of the enthalpy increase switch decision parameter satisfies the first preset condition, and when the parameter value of the enthalpy increase switch decision parameter When the value satisfies the second preset condition, the enthalpy increase is turned off to exit the air injection enthalpy increase heating mode.

In some embodiments, the first preset condition includes: T _ring ≤ T _{to turn on enthalpy increase} , f>f _{to turn on enthalpy increase} , and t _comp >t _{to turn on enthalpy increase} , and the second preset condition is: T _ring ≤ T _{turns on the enthalpy increase} -T _buffer , or f>f _{turns on the enthalpy increase} -f _buffer , wherein, T _ring is the outdoor ambient temperature, T _{turns on the enthalpy increase} is the temperature that triggers the enthalpy increase; f is the air injection enthalpy increase system The compressor frequency of opening enthalpy; f _{opening enthalpy increase is the} frequency of the _compressor that triggers enthalpy increase; The cumulative duration of times, T _buffer and f _buffer are constant.

In some embodiments, the adjustment module 22 is also used to obtain the outlet water temperature, and determine the first target opening degree of the main circuit electronic expansion valve and the enthalpy-increasing electronic expansion valve based on the outdoor ambient temperature, the outlet water temperature, and a preset table. The second target opening degree of the expansion valve; adjusting the opening degree of the main circuit electronic expansion valve to the first target opening degree; adjusting the opening degree of the enthalpy-increasing electronic expansion valve to the second target opening degree .

In some embodiments, the adjustment module 22 is also used to reduce the frequency of the compressor to f to _{start enthalpy increase} -f _buffer when f>f start enthalpy increase, and maintain the compressor when f≤f _{start enthalpy increase} The frequency remains unchanged; and the enthalpy-increasing electronic expansion valve is closed after a preset period of time.

In some embodiments, the adjustment module 22 is also used to obtain the exhaust gas temperature of the gas injection enthalpy increasing system; when the exhaust gas temperature is greater than the preset temperature, increase the preset opening degree of the main circuit electronic expansion valve, And when the exhaust gas temperature is less than or equal to the preset temperature, the opening degree of the main circuit electronic expansion valve remains unchanged.

It can be understood that the air injection enthalpy increase control device corresponds to the air injection enthalpy increase control method in the aforementioned embodiments, and the same or similar parts can refer to the content of the aforementioned air injection enthalpy increase control method.

Based on the same inventive concept, the embodiment of the present application also provides an air conditioner, including an air injection enthalpy increasing system, a processor and a memory, the processor is respectively connected to the air injection enthalpy increasing system and the memory, and the memory stores computer readable instructions for processing The controller invokes the stored instructions and executes the control method for increasing enthalpy by gas injection as described above.

Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, on which computer-readable instructions are stored. When the program is executed by a processor, the steps in the above-mentioned method for controlling enthalpy increase by injection are implemented.

Any reference to memory, storage, database, or other medium as used herein may include non-volatility. Suitable nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory.

In the embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

In addition, the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Furthermore, each functional module in each embodiment of the present application may be integrated to form an independent part, each module may exist independently, or two or more modules may be integrated to form an independent part.

In this document, relational terms such as first and second etc. are used only to distinguish one entity or operation from another without necessarily requiring or implying any such relationship between these entities or operations. Actual relationship or sequence.

The above descriptions are only examples of the present application, and are not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and changes may be made to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (18)

1. A control method for increasing enthalpy by air injection, characterized in that, it is applied to an air injection enthalpy increasing system of an air conditioner, and the method for controlling enthalpy increase by air injection comprises: When the gas injection enthalpy increasing system is in the gas injection enthalpy increasing heating mode, obtain the enthalpy increasing superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree of the gas injection enthalpy increasing system, the enthalpy increasing superheat degree is the difference between the outlet temperature of the auxiliary path of the economizer and the inlet temperature of the auxiliary path of the economizer of the gas injection enthalpy system, the total subcooling degree is the difference between the saturation temperature of the condensing pressure and the outlet temperature of the main path of the economizer, and the exhaust The gas superheat degree is the difference between the exhaust temperature of the gas injection enthalpy increasing system and the saturation temperature of the condensation pressure, and the suction superheat is the difference between the suction temperature of the gas injection enthalpy increasing system and the saturation temperature of the evaporating pressure; adjusting the opening degree of the enthalpy-increasing electronic expansion valve of the air injection enthalpy-increasing system according to the relationship between the enthalpy-increasing superheat degree and the first preset range; According to the relationship between the total subcooling degree and the second preset range, at least one of the relationship between the exhaust superheat degree and the third preset range and the relationship between the suction superheat degree and the fourth preset range Or adjust the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system. 2. The air injection enthalpy increase control method according to claim 1, characterized in that, according to the relationship between the enthalpy increase superheat degree and the first preset range, the temperature of the enthalpy increase electronic expansion valve of the air injection enthalpy increase system is adjusted. opening, including: If the enthalpy-increasing superheat degree is within the first preset range, maintaining the opening of the enthalpy-increasing electronic expansion valve; If the degree of enthalpy-increased superheat is less than the lower limit of the first preset range, the first adjustment is determined based on the degree of enthalpy-increased superheat, the lower limit of the first preset range, and a first preset formula range, and reduce the opening of the enthalpy-increasing electronic expansion valve to the first adjustment range; If the enthalpy-increased superheat degree is greater than the upper limit value of the first preset range, the second adjustment is determined based on the enthalpy-increased superheat degree, the upper limit value of the first preset range and a second preset formula amplitude, and increase the opening of the enthalpy-increasing electronic expansion valve to a greater extent by the second adjustment range. 3. The method for controlling enthalpy increase by gas injection according to claim 2, wherein the first preset formula is: (T _f2 -ΔT ₁ )/2, and the second preset formula is: (ΔT ₁ -T _f1 )/2, wherein ΔT ₁ is the enthalpy-increasing superheat degree, T _f1 is the upper limit of the first preset range, and T _f2 is the lower limit of the first preset range. 4. The method for controlling enthalpy increase by gas injection according to claim 1, characterized in that, according to the relationship between the total subcooling degree and the second preset range, the relationship between the exhaust superheat degree and the third preset range And at least one of the relationship between the suction superheat degree and the fourth preset range adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system, including: If the total subcooling degree is less than the lower limit value of the second preset range, then determine a third adjustment based on the total subcooling degree, the lower limit value of the second preset range and a third preset formula amplitude, and reduce the opening of the main circuit electronic expansion valve by the third adjustment amplitude; If the total subcooling degree is greater than the upper limit value of the second preset range, then determine a fourth adjustment based on the total subcooling degree, the upper limit value of the second preset range and a fourth preset formula amplitude, and increase the opening of the main circuit electronic expansion valve by the fourth adjustment amplitude; If the total subcooling degree is within the second preset range, according to the relationship between the exhaust superheat degree and the third preset range and the relationship between the suction superheat degree and the fourth preset range, At least one of them adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system. 5. The method for controlling enthalpy increase by gas injection according to claim 4, wherein the third preset formula is: (T _sc2 -ΔT ₂ )/2, and the fourth preset formula is: (ΔT ₂ -T _sc1 )/2, wherein ΔT ₂ is the total subcooling degree, T _sc1 is the upper limit of the second preset range, and T _sc2 is the lower limit of the second preset range. 6. The air injection enthalpy increase control method according to claim 4, characterized in that, according to the relationship between the degree of superheat of the exhaust gas and the third preset range and the relationship between the degree of superheat of the intake air and the fourth preset range At least one of them adjusts the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system, including: If the exhaust superheat is less than the lower limit of the third preset range, then determine a fifth adjustment based on the exhaust superheat, the lower limit of the third preset range, and a fifth preset formula amplitude, and reduce the opening degree of the main circuit electronic expansion valve by the fifth adjustment amplitude; If the exhaust superheat is greater than the upper limit of the third preset range, then determine a sixth adjustment based on the exhaust superheat, the upper limit of the third preset range, and a sixth preset formula amplitude, and increase the opening of the main circuit electronic expansion valve by a sixth adjustment range; If the degree of superheat of the exhaust gas is within the third preset range, the opening degree of the main circuit electronic expansion valve of the gas injection enthalpy increasing system is adjusted according to the relationship between the degree of superheat of the intake air and a fourth preset range. 7. The method according to claim 6, wherein the fifth preset formula is: (T _c2 -ΔT ₃ )/2, and the sixth preset formula is: (ΔT ₃ -T _c1 )/2, wherein ΔT ₃ is the exhaust gas superheat, T _c1 is the upper limit of the third preset range, and T _c2 is the lower limit of the third preset range. 8. The method for controlling enthalpy increase by gas injection according to claim 6, wherein the reducing the opening degree of the main circuit electronic expansion valve by the fifth adjustment range comprises: If the opening degree of the main circuit electronic expansion valve reaches its minimum opening degree, the preset opening degree of the enthalpy-increasing electronic expansion valve is increased. 9. The air injection enthalpy increase control method according to claim 6, characterized in that, according to the relationship between the degree of suction superheat and the fourth preset range, the temperature of the main circuit electronic expansion valve of the air injection enthalpy increase system is adjusted. opening, including: If the degree of suction superheat is less than the lower limit of the fourth preset range, then determine a seventh adjustment based on the degree of suction superheat, the lower limit of the fourth preset range, and a seventh preset formula amplitude, and reduce the opening degree of the main circuit electronic expansion valve by the seventh adjustment amplitude; If the degree of suction superheat is greater than the upper limit of the fourth preset range, an eighth adjustment is determined based on the degree of suction superheat, the upper limit of the fourth preset range, and an eighth preset formula amplitude, and increase the opening of the main circuit electronic expansion valve by the eighth adjustment range; If the degree of suction superheat is within the fourth preset range, the opening degree of the main circuit electronic expansion valve remains unchanged. 10. The method for controlling enthalpy increase by gas injection according to claim 9, wherein the seventh preset formula is: (T _s2 -ΔT ₄ )/2, and the eighth preset formula is: (ΔT ₄ - T _s1 )/2, wherein ΔT ₄ is the suction superheat, T _s1 is the upper limit of the fourth preset range, and T _s2 is the lower limit of the fourth preset range. 11. The gas injection enthalpy increase control method according to claim 1, characterized in that, the gas injection enthalpy increase control method further comprises: Obtain the parameter value of the opening and closing decision parameter of enthalpy increase, and the opening and closing decision parameter of enthalpy increase includes outdoor ambient temperature, compressor frequency and single cumulative operation time of compressor; If the parameter value of the enthalpy increase switch decision parameter satisfies the first preset condition, turn on the enthalpy increase to enter the air injection enthalpy increase heating mode; If the parameter value of the enthalpy-increasing on-off decision parameter satisfies the second preset condition, the enthalpy-increasing is turned off to exit the air injection enthalpy-increasing heating mode. 12. The method for controlling enthalpy increase by gas injection according to claim 11, wherein the first preset condition includes: T _loop ≤ T _{to start enthalpy increase} , f>f _{to start enthalpy increase} , and t _comp >t _{to start enthalpy increase Enthalpy} , the second preset condition is: T _ring ≤ T _{to turn on enthalpy increase} -T _buffer , or f>f _{to turn on enthalpy increase} -f _buffer , wherein T _ring is the outdoor ambient temperature, and T _{to turn on enthalpy increase} is the trigger The temperature at which the enthalpy is turned on; f is the compressor frequency of the gas injection enthalpy increasing system; f is _{the compressor} frequency that triggers the enthalpy increasing to start, and t _comp is the single cumulative operation time of the compressor of the gas injection enthalpy increasing system , t _{turn-on enthalpy increase} is the single accumulated time of the compressor that triggers enthalpy increase and turn-on, and T _buffer and f _buffer are constants. 13. The method for controlling enthalpy increase by air injection according to claim 11 or 12, characterized in that if the parameter value of the enthalpy increase switch decision parameter satisfies the first preset condition, the enthalpy increase is turned on to enter the The air injection enthalpy heating mode includes: Obtain the outlet water temperature, and determine the first target opening degree of the main circuit electronic expansion valve and the second target opening degree of the enthalpy-increasing electronic expansion valve based on the outdoor ambient temperature, the outlet water temperature and a preset table; adjusting the opening of the main circuit electronic expansion valve to the first target opening; The opening degree of the enthalpy-increasing electronic expansion valve is adjusted to the second target opening degree. 14. The method for controlling enthalpy increase by gas injection according to claim 12, characterized in that if the parameter value of the enthalpy increase switch decision parameter satisfies the second preset condition, the enthalpy increase is turned off to exit the gas injection Enthalpy heating mode, including: If f>f _{turns on enthalpy increase} , reduce the frequency of the compressor until f _{turns on enthalpy increase} -f _buffer , if f≤f _{turns on enthalpy increase} , then maintains the compressor frequency unchanged; The enthalpy-increasing electronic expansion valve is closed after a preset period of time. 15. The method for controlling enthalpy increase by gas injection according to claim 14, characterized in that, after closing the electronic expansion valve for enthalpy increase after the preset period of time, the method for controlling enthalpy increase by gas injection further comprises: Obtain the exhaust gas temperature of the gas injection enthalpy increasing system; If the exhaust gas temperature is greater than the preset temperature, increase the preset opening of the main circuit electronic expansion valve; if the exhaust gas temperature is less than or equal to the preset temperature, maintain the main circuit electronic expansion valve The opening of the valve remains unchanged. 16. A gas injection enthalpy increase control device, characterized in that it comprises: An acquisition module, configured to obtain the enthalpy-increasing superheat degree, total subcooling degree, exhaust superheat degree and suction superheat degree of the air-injection enthalpy increasing system when the air injection enthalpy increasing system is in the air injection enthalpy increasing heating mode, the The enthalpy-increasing superheat degree is the difference between the outlet temperature of the economizer auxiliary road and the economizer auxiliary road inlet temperature of the gas injection enthalpy-increasing system, and the total subcooling degree is the difference between the condensation pressure saturation temperature and the economizer main road outlet temperature , the exhaust superheat is the difference between the exhaust gas temperature of the gas injection enthalpy increasing system and the saturation temperature of the condensing pressure, and the suction superheat is the difference between the suction temperature of the gas injection enthalpy increasing system and the saturation temperature of the evaporating pressure difference; An adjustment module, configured to adjust the opening degree of the enthalpy-increasing electronic expansion valve of the air injection enthalpy increasing system according to the relationship between the enthalpy-increasing superheat degree and a first preset range; and according to the relationship between the total subcooling degree and a second preset range The relationship between the range, at least one of the relationship between the degree of exhaust superheat and the third preset range and the relationship between the degree of superheat of the intake air and the fourth preset range adjusts the main circuit electronics of the gas injection enthalpy increasing system The opening of the expansion valve. 17. An air conditioner, characterized in that it comprises an air injection enthalpy increasing system, a processor and a memory, the processor is respectively connected to the air injection enthalpy increasing system and the memory signal, and the memory stores a computer-readable instructions, the processor invokes the stored instructions and executes the gas injection enthalpy increase control method according to any one of claims 1 to 15. 18. A storage medium, characterized in that it stores computer-readable instructions, and the computer-readable instructions are invoked by a processor to implement the method for controlling enthalpy increase by gas injection according to any one of claims 1 to 15.