Jet augmentation control method and device, air conditioner and storage medium

Abstract

The application provides a jet augmented control method and device, an air conditioner and a storage medium. The jet augmented control method comprises the following steps: obtaining an augmented heat excess temperature, a total subcooling degree, an exhaust gas superheat degree and an air suction superheat degree of a jet augmented system when the jet augmented system is in a jet augmented heating mode; adjusting an opening degree of an augmented electronic expansion valve of the jet augmented system according to a relationship between the augmented heat excess temperature and a first preset range; and adjusting an opening degree of a main route electronic expansion valve of the jet augmented system according to at least one of a relationship between the total subcooling degree and a second preset range, a relationship between the exhaust gas superheat degree and a third preset range and a relationship between the air suction superheat degree and a fourth preset range. The application controls the opening degrees of the two valves of the jet augmented system based on the augmented heat excess temperature, the total subcooling degree, the exhaust gas superheat degree and the air suction superheat degree, which helps to ensure that the jet augmented system operates stably, reliably and with high energy efficiency in all working conditions.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more specifically, to a jet enthalpy control method and apparatus, an air conditioner, and a storage medium. Background Technology

[0002] In recent years, the application of low-temperature air source heat pump chillers (hereinafter referred to as low-temperature heat pumps) in extremely cold regions has increased. Low-temperature heat pumps typically employ single-stage or two-stage compression systems. For single-stage compression systems, when heating in ultra-low temperature environments (e.g., -35℃ to -20℃), excessively high exhaust temperatures are prone to occur, especially for single-stage compression systems using R32 refrigerant, where this problem is particularly severe. Furthermore, significant reduction in heating capacity is also an unavoidable issue for single-stage compressor systems. Therefore, low-temperature heat pumps used in extremely cold regions often employ two-stage compression systems. However, for two-stage compression systems, existing jet enthalpy control strategies can easily lead to problems such as liquid carryover on the compressor suction side affecting compressor reliability, inability to collect liquid in the enthalpy-increasing path leading to enthalpy-increasing failure, insufficient mass flow rate in the enthalpy-increasing path resulting in poor heating capacity, or excessive mass flow rate in the enthalpy-increasing path leading to poor compressor efficiency or even liquid slugging damage to the compressor. Summary of the Invention

[0003] The purpose of this application is to provide a jet enthalpy control method, a jet enthalpy control device, an air conditioner, and a storage medium to improve the problems caused by improper jet enthalpy strategies in the prior art.

[0004] This application provides a vapor injection enthalpy control method applied to a vapor injection enthalpy system of an air conditioner. The method includes: when the vapor injection enthalpy system is in vapor injection enthalpy heating mode, acquiring the enthalpy superheat, total subcooling, exhaust superheat, and suction superheat of the vapor injection enthalpy system. The enthalpy superheat is the difference between the outlet temperature of the economizer auxiliary circuit and the inlet temperature of the economizer auxiliary circuit. The total subcooling is the difference between the condensing pressure saturation temperature and the economizer main circuit outlet temperature. The exhaust superheat is the result of the vapor injection enthalpy control method. The difference between the exhaust temperature and the condensing pressure saturation temperature of the vapor injection enthalpy enhancement system; the intake superheat is the difference between the intake temperature and the evaporating pressure saturation temperature of the vapor injection enthalpy enhancement system; the opening of the enthalpy enhancement electronic expansion valve of the vapor injection enthalpy enhancement system is adjusted according to the relationship between the enthalpy enhancement superheat and a first preset range; the opening of the main circuit electronic expansion valve of the vapor injection enthalpy enhancement system is adjusted according to at least one of the following: the relationship between the total subcooling and a second preset range; the relationship between the exhaust superheat and a third preset range; and the relationship between the intake superheat and a fourth preset range.

[0005] The jet enthalpy enhancement control method provided in this application controls the opening of the dual valves of the jet enthalpy enhancement system based on the enthalpy enhancement superheat, total subcooling, exhaust superheat, and intake superheat. This helps to improve the problems caused by improper jet enthalpy enhancement strategies in the prior art, thereby ensuring that the jet enthalpy enhancement system operates stably, reliably, and with high energy efficiency under all operating conditions for a long period of time.

[0006] In one embodiment, adjusting the opening of the enthalpy-increasing electronic expansion valve of the jet enthalpy-increasing system according to the relationship between the enthalpy-increasing superheat and a first preset range includes: if the enthalpy-increasing superheat is within the first preset range, maintaining the opening of the enthalpy-increasing electronic expansion valve unchanged; if the enthalpy-increasing superheat is less than the lower limit of the first preset range, determining a first adjustment range based on the enthalpy-increasing superheat, the lower limit of the first preset range, and a first preset formula, and reducing the opening of the enthalpy-increasing electronic expansion valve by the first adjustment range; if the enthalpy-increasing superheat is greater than the upper limit of the first preset range, determining a second adjustment range based on the enthalpy-increasing superheat, the upper limit of the first preset range, and a second preset formula, and increasing the opening of the enthalpy-increasing electronic expansion valve by the second adjustment range.

[0007] In one embodiment, the first preset formula is: (T f2 -ΔT1) / 2, the second preset formula is: (ΔT1-T f1 ) / 2, where ΔT1 is the enthalpy superheat, T f1 T is the upper limit of the first preset range. f2 This is the lower limit of the first preset range.

[0008] In one embodiment, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the relationships between the total subcooling and a second preset range, the exhaust superheat and a third preset range, and the intake superheat and a fourth preset range includes: if the total subcooling is less than the lower limit of the second preset range, then determining a third adjustment range based on the total subcooling, the lower limit of the second preset range, and a third preset formula, and decreasing the opening of the main electronic expansion valve by the third adjustment range; if the total subcooling is greater than the upper limit of the second preset range, then determining a fourth adjustment range based on the total subcooling, the upper limit of the second preset range, and a fourth preset formula, and increasing the opening of the main electronic expansion valve by the fourth adjustment range; if the total subcooling is within the second preset range, then adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the relationships between the exhaust superheat and the third preset range, and the intake superheat and the fourth preset range.

[0009] In one embodiment, the third preset formula is: (Tsc2 -ΔT2) / 2, the fourth preset formula is: (ΔT2-T) / 2, sc1 ) / 2, where ΔT2 is the total subcooling, T sc1 T is the upper limit of the second preset range. sc2 This is the lower limit of the second preset range.

[0010] In one embodiment, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the relationship between the exhaust superheat and a third preset range and the relationship between the intake superheat and a fourth preset range includes: if the exhaust superheat is less than the lower limit of the third preset range, then determining a fifth adjustment range based on the exhaust superheat, the lower limit of the third preset range, and a fifth preset formula, and decreasing the opening of the main electronic expansion valve by the fifth adjustment range; if the exhaust superheat is greater than the upper limit of the third preset range, then determining a sixth adjustment range based on the exhaust superheat, the upper limit of the third preset range, and a sixth preset formula, and increasing the opening of the main electronic expansion valve by the sixth adjustment range; if the exhaust superheat is within the third preset range, then adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the intake superheat and the fourth preset range.

[0011] In one embodiment, the fifth preset formula is: (T c2 -ΔT3) / 2, the sixth preset formula is: (ΔT3-T) / 2, c1 ) / 2, where ΔT3 is the exhaust superheat, T c1 T is the upper limit of the third preset range. c2 This is the lower limit of the third preset range.

[0012] In one embodiment, reducing the opening of the main circuit electronic expansion valve by the fifth adjustment range includes: if the opening of the main circuit electronic expansion valve reaches its minimum opening, then increasing the opening of the enthalpy-increasing electronic expansion valve by a preset amount.

[0013] In one embodiment, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the intake superheat and a fourth preset range includes: if the intake superheat is less than the lower limit of the fourth preset range, then determining a seventh adjustment range based on the intake superheat, the lower limit of the fourth preset range, and a seventh preset formula, and decreasing the opening of the main electronic expansion valve by the seventh adjustment range; if the intake superheat is greater than the upper limit of the fourth preset range, then determining an eighth adjustment range based on the intake superheat, the upper limit of the fourth preset range, and an eighth preset formula, and increasing the opening of the main electronic expansion valve by the eighth adjustment range; if the intake superheat is within the fourth preset range, then maintaining the opening of the main electronic expansion valve unchanged.

[0014] In one embodiment, the seventh preset formula is: (T s2 -ΔT4) / 2, the eighth preset formula: (ΔT4-T) / 2 s1 ) / 2, where ΔT4 is the intake superheat, T s1 T is the upper limit of the fourth preset range. s2 This is the lower limit value of the fourth preset range.

[0015] In one embodiment, the jet enthalpy enhancement control method further includes: acquiring parameter values ​​of enthalpy enhancement on / off determination parameters, the enthalpy enhancement on / off determination parameters including outdoor ambient temperature, compressor frequency, and compressor single cumulative running time; if the parameter values ​​of the enthalpy enhancement on / off determination parameters meet a first preset condition, then enthalpy enhancement is activated to enter the jet enthalpy enhancement heating mode; if the parameter values ​​of the enthalpy enhancement on / off determination parameters meet a second preset condition, then enthalpy enhancement is deactivated to exit the jet enthalpy enhancement heating mode.

[0016] In one embodiment, the first preset condition includes: T 环 ≤T 开启增焓 , f > f 开启增焓 , and t comp >t 开启增焓 The second preset condition is: T 环 ≤T 开启增焓 -T 缓冲 , or f > f 开启增焓 -f 缓冲 , among which, T 环 The outdoor ambient temperature, T 开启增焓 The temperature at which enthalpy enhancement is triggered; f is the compressor frequency of the jet enthalpy enhancement system; f 开启增焓 The compressor frequency that triggers enthalpy increase is t comp t represents the cumulative runtime of the compressor in a single operation of the jet enthalpy enhancement system. 开启增焓 The cumulative duration of a single compressor cycle that triggers enthalpy increase is T.缓冲 and f 缓冲 It is a constant.

[0017] In one embodiment, the step of activating enthalpy enhancement to enter the jet enthalpy enhancement heating mode if the parameter value of the enthalpy enhancement opening / closing determination parameter meets a first preset condition includes: acquiring the outlet water temperature; determining a first target opening degree of the main circuit electronic expansion valve and a second target opening degree of the enthalpy enhancement electronic expansion valve based on the outdoor ambient temperature, the outlet water temperature, and a preset table; 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 enhancement electronic expansion valve to the second target opening degree.

[0018] In one embodiment, the step of shutting down enthalpy enhancement to exit the jet enthalpy enhancement heating mode if the parameter value of the enthalpy enhancement on / off determination parameter meets a second preset condition includes: if f > f 开启增焓 The compressor frequency will be reduced to f. 开启增焓 -f 缓冲 If f≤f 开启增焓 If the compressor frequency remains constant, the enthalpy-increasing electronic expansion valve will be closed after a preset time.

[0019] In one embodiment, after the enthalpy-increasing electronic expansion valve is closed after a preset time, the jet enthalpy control method further includes: obtaining the exhaust temperature of the jet enthalpy-increasing system; if the exhaust temperature is greater than a preset temperature, increasing the opening of the main electronic expansion valve by a preset degree; if the exhaust temperature is less than or equal to the preset temperature, maintaining the opening of the main electronic expansion valve unchanged.

[0020] This application also provides a jet enthalpy enhancement control device, comprising: an acquisition module, configured to acquire the enthalpy enhancement superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy enhancement system when the jet enthalpy enhancement system is in jet enthalpy enhancement heating mode, wherein the enthalpy enhancement superheat is the difference between the outlet temperature of the economizer auxiliary circuit and the inlet temperature of the economizer auxiliary circuit of the jet enthalpy enhancement system, the total subcooling is the difference between the condensing pressure saturation temperature and the economizer main circuit outlet temperature, and the exhaust superheat is the difference between the exhaust temperature and the condensing pressure saturation temperature of the jet enthalpy enhancement system. The difference between pressure saturation temperature, wherein the intake superheat is the difference between the intake temperature and the evaporation pressure saturation temperature of the jet enthalpy enhancement system; an adjustment module, used to adjust the opening of the enthalpy enhancement electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the enthalpy enhancement superheat and a first preset range; and to adjust the opening of the main circuit electronic expansion valve of the jet enthalpy enhancement system according to at least one of the following: the relationship between the total subcooling and a second preset range, the relationship between the exhaust superheat and a third preset range, and the relationship between the intake superheat and a fourth preset range.

[0021] This application also provides an air conditioner, including a jet enthalpy enhancement system, a processor, and a memory. The processor is signal-connected to both the jet enthalpy enhancement system and the memory. The memory stores computer-readable instructions. The processor calls the stored instructions and executes the jet enthalpy enhancement control method as described above.

[0022] This application also provides a storage medium storing computer-readable instructions, which are invoked by a processor to implement the aforementioned jet enthalpy control method.

[0023] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a jet enthalpy enhancement system provided in an embodiment of this application.

[0026] Figure 2 This is a flowchart of a jet enthalpy control method provided in an embodiment of this application.

[0027] Figure 3 This is a structural block diagram of a jet enthalpy control device provided in an embodiment of this application.

[0028] Icons: Compressor-11; Reversing Unit-12; First Heat Exchanger-13; Economizer-14; Second Heat Exchanger-15; Gas-Liquid Separator-16; Main Circuit Electronic Expansion Valve-17; Enthalpy-Increasing Electronic Expansion Valve-18; Intake End-111; Enthalpy-Increasing End-112; Exhaust End-113; First End-121; Second End-122; Third End-123; Fourth End-124; Main Circuit Inlet-141; Main Circuit Outlet-142; Auxiliary Circuit Inlet-143; Auxiliary Circuit Outlet-144; Low-Pressure Sensor-101; Intake Temperature Sensor-102; Exhaust Temperature Sensor-103; High-Pressure Sensor-104; Auxiliary Circuit Inlet Temperature Sensor-105; Auxiliary Circuit Outlet Temperature Sensor-106; Subcooling Temperature Sensor-107; Jet Enthalpy Control Device-20; Acquisition Module-21; Adjustment Module-22. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0030] This application provides a vapor injection enthalpy control method applied to the vapor injection enthalpy system of an air conditioner. In some embodiments, the vapor injection enthalpy system may be part of the two-stage compression system of the air conditioner. Exemplarily, the structure of the vapor injection enthalpy system can be roughly as follows: Figure 1 As shown.

[0031] Figure 1 In the embodiment shown, the jet enthalpy enhancement system includes a compressor 11, a commutator 12, a first heat exchanger 13, an economizer 14, a second heat exchanger 15, a gas-liquid separator 16, a main circuit electronic expansion valve 17, and an enthalpy enhancement electronic expansion valve 18.

[0032] The compressor 11 includes a discharge end 113, a suction end 111, and an enthalpy-increasing end 112. The discharge end 113 is connected to the reversing component 12. The suction end 111 is connected to the gas-liquid separator 16. The enthalpy-increasing end 112 is connected to the auxiliary outlet of the economizer 14.

[0033] The switching element 12 includes a first end 121, a second end 122, a third end 123, and a fourth end 124. The first end 121 is connected to the exhaust end 113. The second end 122 is connected to the second heat exchanger 15. The third end 123 is connected to the gas-liquid separator 16. The fourth end 124 is connected to the first heat exchanger 13. In some embodiments, the switching element 12 can be a four-way valve.

[0034] One end of the first heat exchanger 13 is connected to the fourth end 124, and the other end is connected to the economizer 14. The first heat exchanger 13 can be a water-side heat exchanger, in which case the first heat exchanger 13 is also used to connect to the water circuit.

[0035] Economizer 14 includes a main inlet 141, a main outlet 142, an auxiliary inlet 143, and an auxiliary outlet 144. The main inlet 141 is connected to the first heat exchanger 13. The main outlet 142 is connected to the second heat exchanger 15. The auxiliary inlet 143 is connected to both the main outlet 142 and the second heat exchanger 15. The auxiliary outlet 144 is connected to the enthalpy-increasing end 112. Economizer 14 can be a plate heat exchanger economizer.

[0036] One end of the second heat exchanger 15 is connected to the second end 122, and the other end is connected to the main outlet 142 and the auxiliary inlet 143 respectively. The second heat exchanger 15 can be a finned tube heat exchanger.

[0037] The main line electronic expansion valve 17 is installed between the second heat exchanger 15 and the main line outlet 142. Specifically, the main line electronic expansion valve 17 is installed on the main pipeline between the second heat exchanger 15 and the main line outlet 142.

[0038] An enthalpy-increasing electronic expansion valve 18 is installed on a branch pipeline connecting the auxiliary road inlet 143 and the main pipeline.

[0039] for Figure 1 The jet enthalpy-enhancing system shown has the following system medium flow direction under refrigeration conditions: compressor 11—reversing element 12—second heat exchanger 15—economizer 14—first heat exchanger 13—reversing element 14—gas-liquid separator 16—compressor 11; under heating conditions, the system medium flow direction is: compressor 11—reversing element 12—first heat exchanger 13—economizer 14—second heat exchanger 15—reversing element 12—gas-liquid separator 16—compressor 11; under enthalpy-enhancing conditions, the enthalpy-enhancing medium flows through the auxiliary outlet 144 of the economizer 14 and the enthalpy-enhancing end 112 of the compressor 11 into the compressor 11.

[0040] Figure 1 In the illustrated embodiment, the jet enthalpy enhancement system further includes a low-pressure sensor 101, an intake temperature sensor 102, an exhaust temperature sensor 103, a high-pressure sensor 104, an auxiliary path inlet temperature sensor 105, an auxiliary path outlet temperature sensor 106, and a subcooling temperature sensor 107.

[0041] Both the low-pressure sensor 101 and the intake temperature sensor 102 are installed on the pipeline connecting the third end 123 and the gas-liquid separator 16, with the low-pressure sensor 101 being closer to the gas-liquid separator 16 than the intake temperature sensor 102. The low-pressure sensor 101 is used to detect the evaporation pressure saturation temperature T of the jet enthalpy enhancement system. ps The intake temperature sensor 102 is used to detect the intake temperature T of the jet enthalpy enhancement system. s .

[0042] Both the exhaust temperature sensor 103 and the high-pressure sensor 104 are installed on the pipeline between the exhaust end 113 and the first end 121, with the exhaust temperature sensor 103 being closer to the exhaust end 113 than the high-pressure sensor 104. The exhaust temperature sensor 103 is used to detect the exhaust temperature T of the jet enthalpy enhancement system. c The high-pressure sensor 104 is used to detect the condensation pressure saturation temperature T of the jet enthalpy enhancement system. pc .

[0043] The auxiliary pipeline inlet temperature sensor 105 is installed on the branch pipeline connecting the auxiliary pipeline inlet 143 and the main pipeline, and is closer to the auxiliary pipeline inlet 143 than the enthalpy-increasing electronic expansion valve 18. The auxiliary pipeline inlet temperature sensor 105 is used to detect the auxiliary pipeline inlet temperature T. fi.

[0044] The auxiliary pipeline outlet temperature sensor 106 is installed on the pipeline between the auxiliary pipeline outlet 144 and the enthalpy-increasing end 112, and is positioned close to the auxiliary pipeline outlet 144. The auxiliary pipeline outlet temperature sensor 106 is used to detect the auxiliary pipeline outlet temperature T. fo .

[0045] The subcooling temperature sensor 107 is installed on the main pipeline between the second heat exchanger 15 and the main outlet 142, and is positioned close to the main outlet 142. The subcooling temperature sensor 107 is used to detect the total subcooling temperature T of the jet enthalpy enhancement system. sc (i.e., the main outlet temperature of the economizer).

[0046] Furthermore, for a jet enthalpy enhancement system, the exhaust superheat ΔT1 = exhaust temperature T c - Condensation pressure saturation temperature T pc Intake superheat ΔT2 = Intake temperature T s - Evaporation pressure saturation temperature T ps ; Enthalpy superheat ΔT3 = Auxiliary road outlet temperature T fo -Auxiliary road inlet temperature T fi Total subcooling ΔT4 = condensing pressure / saturation temperature T pc –T sc .

[0047] It is understood that the jet enthalpy enhancement system described here is merely an example, and this application is not limited thereto. In other embodiments, the jet enthalpy enhancement system may have other structures.

[0048] Please see Figure 2 In some embodiments, the jet enthalpy control method includes the following steps.

[0049] Step S11: When the jet enthalpy enhancement system is in jet enthalpy enhancement heating mode, acquire the enthalpy enhancement superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy enhancement system. The enthalpy enhancement superheat is the difference between the economizer auxiliary outlet temperature and the economizer auxiliary inlet temperature. The total subcooling is the difference between the condensing pressure saturation temperature and the economizer main outlet temperature. The exhaust superheat is the difference between the exhaust temperature and the condensing pressure saturation temperature of the jet enthalpy enhancement system. The intake superheat is the difference between the intake temperature and the evaporating pressure saturation temperature of the jet enthalpy enhancement system.

[0050] In some embodiments, when the jet enthalpy enhancement system is in jet enthalpy enhancement heating mode, the evaporation pressure saturation temperature T of the jet enthalpy enhancement system can be detected first by the low-pressure pressure sensor 101. ps The intake temperature T of the jet enthalpy enhancement system is detected by the intake temperature sensor 102. s The exhaust temperature T of the jet enthalpy enhancement system is detected by exhaust temperature sensor 103.c The condensation pressure saturation temperature T of the jet enthalpy enhancement system is detected by high-pressure pressure sensor 104. pc The auxiliary road inlet temperature T is detected by the auxiliary road inlet temperature sensor 105. fi The auxiliary road outlet temperature T is detected by the auxiliary road outlet temperature sensor 106. fo The total subcooling temperature T of the jet enthalpy enhancement system is detected by the subcooling temperature sensor 107. sc Then, based on the detected parameter values ​​and the calculation formulas for enthalpy-increasing superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy-increasing system, respectively, the enthalpy-increasing superheat, total subcooling, exhaust superheat, and intake superheat are calculated.

[0051] Step S12: Adjust the opening of the electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the enthalpy superheat and the first preset range.

[0052] In some embodiments, step S12 may include: if the enthalpy superheat is within a first preset range, then maintaining the opening of the enthalpy-increasing electronic expansion valve unchanged; if the enthalpy superheat is less than the lower limit of the first preset range, then determining a first adjustment range based on the enthalpy superheat, the lower limit of the first preset range, and a first preset formula, and reducing the opening of the enthalpy-increasing electronic expansion valve by the first adjustment range; if the enthalpy superheat is greater than the upper limit of the first preset range, then determining a second adjustment range based on the enthalpy superheat, the upper limit of the first preset range, and a second preset formula, and increasing the opening of the enthalpy-increasing electronic expansion valve by the second adjustment range.

[0053] 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 enthalpy superheat, Tf1 is the upper limit of the first preset range, and Tf2 is the lower limit of the first preset range.

[0054] Step S13: Adjust the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the following: the relationship between total subcooling and the second preset range, the relationship between exhaust superheat and the third preset range, and the relationship between intake superheat and the fourth preset range.

[0055] In some embodiments, step S13 may include: if the total subcooling is less than the lower limit of the second preset range, then a third adjustment range is determined based on the total subcooling, the lower limit of the second preset range, and a third preset formula, and the opening of the main electronic expansion valve is reduced by the third adjustment range; if the total subcooling is greater than the upper limit of the second preset range, then a fourth adjustment range is determined based on the total subcooling, the upper limit of the second preset range, and a fourth preset formula, and the opening of the main electronic expansion valve is increased by the fourth adjustment range; if the total subcooling is within the second preset range, then the opening of the main electronic expansion valve of the jet enthalpy enhancement system is adjusted according to at least one of the relationship between exhaust superheat and the third preset range and the relationship between intake superheat and the fourth preset range.

[0056] 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, Tsc1 is the upper limit of the second preset range, and Tsc2 is the lower limit of the second preset range.

[0057] In some embodiments, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system based on at least one of the relationship between exhaust superheat and a third preset range and the relationship between intake superheat and a fourth preset range includes: if the exhaust superheat is less than the lower limit of the third preset range, determining a fifth adjustment range based on the exhaust superheat, the lower limit of the third preset range, and a fifth preset formula, and decreasing the opening of the main electronic expansion valve by the fifth adjustment range; if the exhaust superheat is greater than the upper limit of the third preset range, determining a sixth adjustment range based on the exhaust superheat, the upper limit of the third preset range, and a sixth preset formula, and increasing the opening of the main electronic expansion valve by the sixth adjustment range; if the exhaust superheat is within the third preset range, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system based on the relationship between intake superheat and the fourth preset range.

[0058] In one embodiment, the fifth preset formula can be: (Tc2-ΔT3) / 2, and the sixth preset formula can be: (ΔT3-Tc1) / 2, where ΔT3 is the exhaust superheat, Tc1 is the upper limit of the third preset range, and Tc2 is the lower limit of the third preset range.

[0059] In one embodiment, reducing the opening of the main circuit electronic expansion valve by a fifth adjustment range includes: if the opening of the main circuit electronic expansion valve reaches its minimum opening, then increasing the opening of the enthalpy-increasing electronic expansion valve by a preset amount.

[0060] In some embodiments, adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the intake superheat and a fourth preset range includes: if the intake superheat is less than the lower limit of the fourth preset range, then determining a seventh adjustment range based on the intake superheat, the lower limit of the fourth preset range, and a seventh preset formula, and decreasing the opening of the main electronic expansion valve by the seventh adjustment range; if the intake superheat is greater than the upper limit of the fourth preset range, then determining an eighth adjustment range based on the intake superheat, the upper limit of the fourth preset range, and an eighth preset formula, and increasing the opening of the main electronic expansion valve by the eighth adjustment range; if the intake superheat is within the fourth preset range, then maintaining the opening of the main electronic expansion valve unchanged.

[0061] In one embodiment, the seventh preset formula can be: (Ts2-ΔT4) / 2, and the eighth preset formula can be: (ΔT4-Ts1) / 2, where ΔT4 is the intake superheat, Ts1 is the upper limit of the fourth preset range, and Ts2 is the lower limit of the fourth preset range.

[0062] It should be noted that steps S12 and S13 are not in any particular order. That is, step S12 can be executed before step S13, or step S12 can be executed after step S13, or step S12 can be executed simultaneously with step S13.

[0063] The vapor injection enthalpy enhancement control method provided in this application controls the opening of the dual valves of the vapor injection enthalpy enhancement system based on the enthalpy enhancement superheat, total subcooling, exhaust superheat, and suction superheat. This helps to improve the problems caused by improper vapor injection enthalpy enhancement strategies in the prior art, ensuring the compressor remains reliable during free operation of the vapor injection enthalpy enhancement system and reducing the risk of liquid slugging on both the suction and enthalpy enhancement sides. During free operation, the exhaust temperature is kept stable, preventing excessively high exhaust temperatures from causing compressor frequency reduction or damage. Under ultra-low ambient temperatures, it ensures successful liquid extraction from the enthalpy enhancement auxiliary circuit, improving the enthalpy enhancement effect. Furthermore, it makes the mass flow rate of the enthalpy enhancement auxiliary circuit controllable, adapting to different operating conditions and controlling the refrigerant state (two-phase, saturated, superheated) at the compressor's enthalpy enhancement port, thereby achieving a better energy-efficient enthalpy enhancement effect. This ensures the long-term stable, reliable, and highly energy-efficient operation of the vapor injection enthalpy enhancement system under all operating conditions.

[0064] It is understandable that after adjusting the opening of the main electronic expansion valve and / or the opening of the enthalpy-enhancing electronic expansion valve, the jet enthalpy enhancement system needs to operate for a period of time to reach a steady state after the adjustment. Therefore, steps S11, S12 and S13 can be performed periodically to continuously detect whether the jet enthalpy enhancement system is operating in an optimal operating mode that is close to the current operating conditions. When the jet enthalpy enhancement system is not operating in the optimal operating mode, it is gradually adjusted to make the jet enthalpy enhancement system approach the optimal operating mode. This further improves the problems caused by improper jet enthalpy enhancement strategies in the prior art, thereby further ensuring that the jet enthalpy enhancement system operates stably, reliably and with high energy efficiency under all operating conditions for a long time.

[0065] Specifically, in step S11, the evaporation pressure saturation temperature T of the jet enthalpy enhancement system is... ps Intake temperature T s Exhaust temperature T c Condensation pressure saturation temperature T pc Auxiliary road inlet temperature T fi Auxiliary road outlet temperature T fo Total subcooling temperature T sc Any parameter value in the system can be periodically tested.

[0066] For example, the evaporation pressure saturation temperature T of the jet enthalpy enhancement system after each entry into the jet enthalpy enhancement heating mode is... ps Intake temperature T s Exhaust temperature T c Condensation pressure saturation temperature T pc Auxiliary road inlet temperature T fi Auxiliary road outlet temperature T fo Total subcooling temperature T sc The initial test can begin after a first preset time period following the entry of the jet enthalpy-enhanced heating mode. For the auxiliary inlet temperature T of the jet enthalpy-enhanced system under jet enthalpy-enhanced heating mode... fi and auxiliary road outlet temperature T fo The non-initial test can begin after a second preset time period following each adjustment of the opening of the enthalpy-enhancing electronic expansion valve. For the jet enthalpy-enhancing heating mode, the evaporation pressure saturation temperature T of the jet enthalpy-enhancing system... ps and intake temperature T s For non-first-time testing, or for exhaust temperature T under jet enthalpy boosting heating mode c and condensation pressure saturation temperature T pc For non-first-time testing, or for the total subcooling temperature T under jet enthalpy-enhanced heating mode sc The non-first detection can begin after a third preset time period, starting from the moment the opening of the main electronic expansion valve is adjusted each time.

[0067] It is understandable that the first, second, and third preset durations can be the same, so as to simultaneously control the opening of the main circuit electronic expansion valve and the enthalpy-increasing electronic expansion valve based on the enthalpy superheat, total subcooling, exhaust superheat, and intake superheat. Of course, the first, second, and third preset durations can also be set to different durations as needed.

[0068] Correspondingly, the calculations of the enthalpy-enhancing superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy-enhancing system can also be performed periodically. For example, each time the evaporation pressure saturation temperature T of the jet enthalpy-enhancing system is obtained... ps Intake temperature T s Exhaust temperature T c Condensation pressure saturation temperature T pc Auxiliary road inlet temperature T fi Auxiliary road outlet temperature T fo Total subcooling temperature T sc Once the parameter values ​​are obtained, the enthalpy superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy enhancement system can be calculated based on these parameter values.

[0069] Accordingly, after calculating the enthalpy superheat, total subcooling, exhaust superheat and intake superheat of the jet enthalpy enhancement system each time, steps S12 and / or S13 can be executed.

[0070] It should be noted that the following four adjustments—adjusting the opening of the enthalpy-increasing electronic expansion valve of the jet enthalpy-increasing system based on the relationship between the enthalpy-increasing superheat and the first preset range, adjusting the opening of the main circuit electronic expansion valve based on the relationship between the total subcooling and the second preset range, adjusting the opening of the main circuit electronic expansion valve based on the relationship between the exhaust superheat and the third preset range, and adjusting the opening of the main circuit electronic expansion valve based on the relationship between the intake superheat and the fourth preset range—can have different priorities. Specifically, the priorities, from highest to lowest, are as follows: adjusting the opening of the main circuit electronic expansion valve based on the relationship between the total subcooling and the second preset range; adjusting the opening of the main circuit electronic expansion valve based on the relationship between the exhaust superheat and the third preset range; adjusting the opening of the main circuit electronic expansion valve based on the relationship between the intake superheat and the fourth preset range; and adjusting the opening of the enthalpy-increasing electronic expansion valve of the jet enthalpy-increasing system based on the relationship between the enthalpy-increasing superheat and the first preset range.

[0071] In some embodiments, the jet enthalpy enhancement control method may further include: acquiring the parameter value of the enthalpy enhancement on / off determination parameter; if the parameter value of the enthalpy enhancement on / off determination parameter meets a first preset condition, then enthalpy enhancement is turned on to enter the jet enthalpy enhancement heating mode; if the parameter value of the enthalpy enhancement on / off determination parameter meets a second preset condition, then enthalpy enhancement is turned off to exit the jet enthalpy enhancement heating mode.

[0072] In one embodiment, the parameters determining the enthalpy increase on / off state include the outdoor ambient temperature, compressor frequency, and compressor cumulative runtime per cycle. It should be noted that the compressor cumulative runtime per cycle refers to the cumulative runtime of the compressor after each start-up of the air conditioner. It is understood that the specific methods for obtaining the outdoor ambient temperature, compressor frequency, and compressor cumulative runtime per cycle can be found in existing technologies, and this application will not elaborate on these aspects.

[0073] In one embodiment, the first preset condition includes: T 环 ≤T 开启增焓 , f > f 开启增焓 , and t comp >t 开启增焓 The second preset condition is: T 环 ≤T 开启增焓 -T 缓冲 , or f > f 开启增焓 -f 缓冲 , among which, T 环 The outdoor ambient temperature, T 开启增焓 The temperature at which enthalpy enhancement is triggered; f is the compressor frequency of the jet enthalpy enhancement system; f 开启增焓 The compressor frequency that triggers enthalpy increase is t comp The cumulative runtime of the compressor in a single operation of the jet enthalpy enhancement system, t 开启增焓 The cumulative duration of a single compressor cycle that triggers enthalpy increase is T. 缓冲 and f 缓冲 It is a constant. For example, T 开启增焓 The value of f can be between -5℃ and 10℃; 开启增焓 The value of t can be between 30Hz and 60Hz; 开启增焓 The value of T can be between 3 min and 10 min; 缓冲 The value of f is between 5℃ and 15℃; 缓冲 The value ranges from 5Hz to 20Hz.

[0074] In some embodiments, if the parameter value of the enthalpy increase opening / closing determination parameter meets a first preset condition, enthalpy increase is activated to enter the jet enthalpy increase heating mode. This may include: acquiring the outlet water temperature; determining a first target opening degree of the main circuit electronic expansion valve and a second target opening degree of the enthalpy increase electronic expansion valve based on the outdoor ambient temperature, the outlet water temperature, and a preset table; 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 increase electronic expansion valve to the second target opening degree. The preset table records the optimal opening degree of the main circuit electronic expansion valve and the optimal opening degree of the enthalpy increase electronic expansion valve under different outdoor ambient temperatures and different outlet water temperatures. In other words, the preset table records the correspondence between the outdoor ambient temperature, the outlet water temperature, the optimal opening degree of the main circuit electronic expansion valve, and the optimal opening degree of the enthalpy increase electronic expansion valve. With the outdoor ambient temperature and outlet water temperature determined, setting the optimal opening degree of the main circuit electronic expansion valve and the optimal opening degree of the enthalpy-increasing electronic expansion valve corresponding to the outdoor ambient temperature and outlet water temperature can ensure that the jet enthalpy-increasing system has better energy efficiency, stable exhaust temperature operation, and no liquid-carrying compression of the compressor.

[0075] It should be noted that the specific method for obtaining the outlet water temperature can refer to existing technologies, and this application will not elaborate on it.

[0076] In one embodiment, adjusting the opening of the main circuit electronic expansion valve to a first target opening and adjusting the opening of the enthalpy-increasing electronic expansion valve to a second target opening can be performed according to a preset timing sequence. For example, the opening of the enthalpy-increasing electronic expansion valve can be adjusted to the second target opening first, and the opening of the main circuit electronic expansion valve can be adjusted to the first target opening only after a preset time interval.

[0077] In one embodiment, if the parameter value of the enthalpy enhancement on / off determination parameter meets a second preset condition, the enthalpy enhancement is turned off to exit the jet enthalpy enhancement heating mode, including: if f > f 开启增焓 Then the compressor frequency will be reduced to f. 开启增焓 -f 缓冲 If f≤f 开启增焓 If the compressor frequency remains constant, the enthalpy-increasing electronic expansion valve will be closed after a preset time.

[0078] In one embodiment, after closing the enthalpy-increasing electronic expansion valve after a preset time, the jet enthalpy-increasing control method may further include: obtaining the exhaust temperature of the jet enthalpy-increasing system; if the exhaust temperature is greater than a preset temperature, increasing the opening of the main electronic expansion valve by a preset degree; if the exhaust temperature is less than or equal to the preset temperature, maintaining the opening of the main electronic expansion valve unchanged.

[0079] Understandably, the jet enthalpy enhancement system can also shut off enthalpy enhancement when it is determined to enter defrost mode.

[0080] Please see Figure 3Based on the same inventive concept, this application also provides a jet enthalpy enhancement control device 20, including: an acquisition module 21, used to acquire the enthalpy enhancement superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy enhancement system when the jet enthalpy enhancement system is in jet enthalpy enhancement heating mode; the enthalpy enhancement superheat is the difference between the outlet temperature of the economizer auxiliary circuit and the inlet temperature of the economizer auxiliary circuit; the total subcooling is the difference between the condensing pressure saturation temperature and the economizer main circuit outlet temperature; and the exhaust superheat is the difference between the outlet temperature of the jet enthalpy enhancement system and the intake superheat. The difference between the exhaust temperature and the condensing pressure saturation temperature, and the intake superheat is the difference between the intake temperature and the evaporating pressure saturation temperature of the jet enthalpy enhancement system; the adjustment module 22 is used to adjust the opening of the enthalpy enhancement electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the enthalpy enhancement superheat and the first preset range; and to adjust the opening of the main circuit electronic expansion valve of the jet enthalpy enhancement system according to at least one of the following: the relationship between the total subcooling and the second preset range, the relationship between the exhaust superheat and the third preset range, and the relationship between the intake superheat and the fourth preset range.

[0081] In some embodiments, the adjustment module 22 is configured to: maintain the opening of the enthalpy-increasing electronic expansion valve unchanged when the enthalpy-increasing superheat is within the first preset range; determine a first adjustment range based on the enthalpy-increasing superheat, the lower limit of the first preset range, and a first preset formula when the enthalpy-increasing superheat is less than the lower limit of the first preset range, and reduce the opening of the enthalpy-increasing electronic expansion valve by the first adjustment range; and determine a second adjustment range based on the enthalpy-increasing superheat, the upper limit of the first preset range, and a second preset formula when the enthalpy-increasing superheat is greater than the upper limit of the first preset range, and increase the opening of the enthalpy-increasing electronic expansion valve by the second adjustment range.

[0082] In some embodiments, the first preset formula is: (T f2 -ΔT1) / 2, the second preset formula is: (ΔT1-T f1 ) / 2, where ΔT1 is the enthalpy superheat, T f1 T is the upper limit of the first preset range. f2 This is the lower limit of the first preset range.

[0083] In some embodiments, the adjustment module 22 is configured to: determine a third adjustment range based on the total subcooling, the lower limit of the second preset range, and a third preset formula when the total subcooling is less than the lower limit of the second preset range; and decrease the opening of the main electronic expansion valve by the third adjustment range; determine a fourth adjustment range based on the total subcooling, the upper limit of the second preset range, and a fourth preset formula when the total subcooling is greater than the upper limit of the second preset range; and increase the opening of the main electronic expansion valve by the fourth adjustment range when the total subcooling is within the second preset range; and adjust the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the relationship between the exhaust superheat and the third preset range and the relationship between the intake superheat and the fourth preset range when the total subcooling is within the second preset range.

[0084] In some embodiments, the third preset formula is: (T sc2 -ΔT2) / 2, the fourth preset formula is: (ΔT2-T) / 2, sc1 ) / 2, where ΔT2 is the total subcooling, T sc1 T is the upper limit of the second preset range. sc2 This is the lower limit of the second preset range.

[0085] In some embodiments, the adjustment module 22 is used to determine a fifth adjustment range based on the exhaust superheat, the lower limit of the third preset range, and a fifth preset formula when the exhaust superheat is less than the lower limit of the third preset range, and to decrease the opening of the main electronic expansion valve by the fifth adjustment range; when the exhaust superheat is greater than the upper limit of the third preset range, to determine a sixth adjustment range based on the exhaust superheat, the upper limit of the third preset range, and a sixth preset formula, and to increase the opening of the main electronic expansion valve by the sixth adjustment range; and when the exhaust superheat is within the third preset range, to adjust the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the intake superheat and a fourth preset range.

[0086] In some embodiments, the fifth preset formula is: (T c2 -ΔT3) / 2, the sixth preset formula is: (ΔT3-T) / 2, c1 ) / 2, where ΔT3 is the exhaust superheat, T c1 T is the upper limit of the third preset range. c2 This is the lower limit of the third preset range.

[0087] In some embodiments, the adjustment module 22 is also used to increase the opening of the enthalpy-increasing electronic expansion valve by a preset degree when the opening of the main electronic expansion valve reaches its minimum opening degree.

[0088] In some embodiments, the adjustment module 22 is further configured to: when the intake superheat is less than the lower limit of the fourth preset range, determine a seventh adjustment range based on the intake superheat, the lower limit of the fourth preset range, and a seventh preset formula, and decrease the opening of the main circuit electronic expansion valve by the seventh adjustment range; when the intake superheat is greater than the upper limit of the fourth preset range, determine an eighth adjustment range based on the intake superheat, the upper limit of the fourth preset range, and an eighth preset formula, and increase the opening of the main circuit electronic expansion valve by the eighth adjustment range; and when the intake superheat is within the fourth preset range, maintain the opening of the main circuit electronic expansion valve unchanged.

[0089] In some embodiments, the seventh preset formula is: (T s2 -ΔT4) / 2, the eighth preset formula: (ΔT4-T) / 2 s1 ) / 2, where ΔT4 is the intake superheat, T s1 T is the upper limit of the fourth preset range. s2 This is the lower limit value of the fourth preset range.

[0090] In some embodiments, the acquisition module 21 is further configured to acquire the parameter values ​​of the enthalpy increase on / off decision parameters, which include the outdoor ambient temperature, compressor frequency, and compressor cumulative running time per cycle; the adjustment module 22 is further configured to turn on enthalpy increase when the parameter values ​​of the enthalpy increase on / off decision parameters meet a first preset condition to enter the jet enthalpy increase heating mode, and to turn off enthalpy increase when the parameter values ​​of the enthalpy increase on / off decision parameters meet a second preset condition to exit the jet enthalpy increase heating mode.

[0091] In some embodiments, the first preset condition includes: T 环 ≤T 开启增焓 , f > f 开启增焓 , and t comp >t 开启增焓 The second preset condition is: T 环 ≤T 开启增焓 -T 缓冲 , or f > f 开启增焓 -f 缓冲 , among which, T 环 The outdoor ambient temperature, T 开启增焓 The temperature at which enthalpy enhancement is triggered; f is the compressor frequency of the jet enthalpy enhancement system; f 开启增焓 The compressor frequency that triggers enthalpy increase is t comp t represents the cumulative runtime of the compressor in a single operation of the jet enthalpy enhancement system. 开启增焓 The cumulative duration of a single compressor cycle that triggers enthalpy increase is T. 缓冲 and f 缓冲 It is a constant.

[0092] In some embodiments, the adjustment module 22 is further configured to acquire the outlet water temperature, 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; adjust the opening degree of the main circuit electronic expansion valve to the first target opening degree; and adjust the opening degree of the enthalpy-increasing electronic expansion valve to the second target opening degree.

[0093] In some embodiments, the adjustment module 22 is also used when f > f 开启增焓 At that time, the compressor frequency will be reduced to f. 开启增焓 -f 缓冲 When f≤f 开启增焓 During this period, the compressor frequency is maintained constant; and the enthalpy-increasing electronic expansion valve is closed after a preset time.

[0094] In some embodiments, the adjustment module 22 is also used to obtain the exhaust temperature of the jet enthalpy enhancement system; when the exhaust temperature is greater than a preset temperature, to increase the opening of the main electronic expansion valve by a preset degree; and when the exhaust temperature is less than or equal to the preset temperature, to maintain the opening of the main electronic expansion valve unchanged.

[0095] It is understood that the jet enthalpy enhancement control device corresponds to the jet enthalpy enhancement control method in the aforementioned embodiments. The same or similar parts can be referred to the content of the aforementioned jet enthalpy enhancement control method. For the sake of brevity, the description will not be repeated.

[0096] Based on the same inventive concept, this application also provides an air conditioner, including a jet enthalpy enhancement system, a processor, and a memory. The processor is signal-connected to the jet enthalpy enhancement system and the memory, respectively. The memory stores computer-readable instructions, and the processor calls the stored instructions and executes the jet enthalpy enhancement control method as described above.

[0097] Based on the same inventive concept, this application provides a computer-readable storage medium storing computer-readable instructions, which, when executed by a processor, implement the steps in the above-described jet enthalpy control method.

[0098] Any references to memory, storage, databases, or other media used herein may include non-volatile memory. Suitable non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory.

[0099] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0100] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0101] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0102] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0103] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling jet enthalpy increase, characterized in that, A vapor injection enthalpy enhancement system applied to an air conditioner, wherein the vapor injection enthalpy enhancement control method includes: When the jet enthalpy enhancement system is in jet enthalpy enhancement heating mode, the enthalpy enhancement superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy enhancement system are acquired. The enthalpy enhancement superheat is the difference between the outlet temperature of the economizer auxiliary circuit and the inlet temperature of the economizer auxiliary circuit of the jet enthalpy enhancement system. The total subcooling is the difference between the condensing pressure saturation temperature and the economizer main circuit outlet temperature. The exhaust superheat is the difference between the exhaust temperature and the condensing pressure saturation temperature of the jet enthalpy enhancement system. The intake superheat is the difference between the intake temperature and the evaporating pressure saturation temperature of the jet enthalpy enhancement system. The opening degree of the electronic expansion valve of the jet enthalpy enhancement system is adjusted according to the relationship between the enthalpy superheat and the first preset range. The opening of the main electronic expansion valve of the jet enthalpy enhancement system is adjusted according to at least one of the following: the relationship between the total subcooling and the second preset range, the relationship between the exhaust superheat and the third preset range, and the relationship between the intake superheat and the fourth preset range. Adjusting the opening of the electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the enthalpy superheat and the first preset range includes: If the enthalpy superheat is within the first preset range, the opening of the enthalpy-increasing electronic expansion valve remains unchanged; If the enthalpy superheat is less than the lower limit of the first preset range, then a first adjustment range is determined based on the enthalpy superheat, the lower limit of the first preset range, and the first preset formula, and the opening of the enthalpy electronic expansion valve is reduced by the first adjustment range. If the enthalpy superheat is greater than the upper limit of the first preset range, then a second adjustment range is determined based on the enthalpy superheat, the upper limit of the first preset range, and the second preset formula, and the opening of the enthalpy electronic expansion valve is increased by the second adjustment range. The first preset formula is: (T) f2 -ΔT1) / 2, the second preset formula is: (ΔT1-T) / 2, f1 ) / 2, where ΔT1 is the enthalpy superheat, T f1 T is the upper limit of the first preset range. f2 This is the lower limit of the first preset range.

2. The jet enthalpy control method as described in claim 1, characterized in that, Adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the following three relationships: the relationship between the total subcooling and the second preset range, the relationship between the exhaust superheat and the third preset range, and the relationship between the intake superheat and the fourth preset range, includes: If the total subcooling is less than the lower limit of the second preset range, then a third adjustment range is determined based on the total subcooling, the lower limit of the second preset range, and the third preset formula, and the opening of the main electronic expansion valve is reduced by the third adjustment range. If the total subcooling is greater than the upper limit of the second preset range, then a fourth adjustment range is determined based on the total subcooling, the upper limit of the second preset range, and the fourth preset formula, and the opening of the main electronic expansion valve is increased by the fourth adjustment range. If the total subcooling is within the second preset range, the opening of the main electronic expansion valve of the jet enthalpy enhancement system is adjusted according to at least one of the relationship between the exhaust superheat and the third preset range and the relationship between the intake superheat and the fourth preset range.

3. The jet enthalpy control method as described in claim 2, characterized in that, The third preset formula is: (T) sc2 -ΔT2) / 2, the fourth preset formula is: (ΔT2-T) / 2, sc1 ) / 2, where ΔT2 is the total subcooling, T sc1 T is the upper limit of the second preset range. sc2 This is the lower limit of the second preset range.

4. The jet enthalpy control method as described in claim 3, characterized in that, Adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to at least one of the relationship between the exhaust superheat and the third preset range and the relationship between the intake superheat and the fourth preset range includes: If the exhaust superheat is less than the lower limit of the third preset range, then 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 opening of the main 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, then a sixth adjustment range is determined based on the exhaust superheat, the upper limit of the third preset range, and the sixth preset formula, and the opening of the main electronic expansion valve is increased by the sixth adjustment range. If the exhaust superheat is within the third preset range, the opening of the main electronic expansion valve of the jet enthalpy enhancement system is adjusted according to the relationship between the intake superheat and the fourth preset range.

5. The jet enthalpy control method as described in claim 4, characterized in that, The fifth preset formula is: (T) c2 -ΔT3) / 2, the sixth preset formula is: (ΔT3-T) / 2, c1 ) / 2, where ΔT3 is the exhaust superheat, T c1 T is the upper limit of the third preset range. c2 This is the lower limit of the third preset range.

6. The jet enthalpy control method as described in claim 4, characterized in that, The fifth adjustment range for reducing the opening of the main electronic expansion valve includes: If the opening of the main circuit electronic expansion valve reaches its minimum opening, the enthalpy-increasing electronic expansion valve will be increased to a preset opening.

7. The jet enthalpy control method as described in claim 4, characterized in that, Adjusting the opening of the main electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the intake superheat and the fourth preset range includes: If the intake superheat is less than the lower limit of the fourth preset range, then a seventh adjustment range is determined based on the intake superheat, the lower limit of the fourth preset range, and the seventh preset formula, and the opening of the main electronic expansion valve is reduced by the seventh adjustment range. If the intake superheat is greater than the upper limit of the fourth preset range, then the eighth adjustment range is determined based on the intake superheat, the upper limit of the fourth preset range and the eighth preset formula, and the opening of the main electronic expansion valve is increased by the eighth adjustment range. If the intake superheat is within the fourth preset range, the opening of the main electronic expansion valve remains unchanged.

8. The jet enthalpy control method as described in claim 7, characterized in that, The seventh preset formula is: (T) s2 -ΔT4) / 2, the eighth preset formula: (ΔT4-T) s1 ) / 2, where ΔT4 is the intake superheat, T s1 T is the upper limit of the fourth preset range. s2 This is the lower limit value of the fourth preset range.

9. The jet enthalpy control method as described in claim 1, characterized in that, The jet enthalpy control method further includes: Obtain the parameter values ​​of the enthalpy increase on / off decision parameters, which include outdoor ambient temperature, compressor frequency, and compressor cumulative running time per cycle. If the parameter value of the enthalpy increase on / off determination parameter meets the first preset condition, then the enthalpy increase is turned on to enter the jet enthalpy increase heating mode. If the parameter value of the enthalpy increase on / off determination parameter meets the second preset condition, then the enthalpy increase is turned off to exit the jet enthalpy increase heating mode.

10. The jet enthalpy control method as described in claim 9, characterized in that, The first preset condition includes: T 环 ≤T 开启增焓 , f > f 开启增焓 , and t comp >t 开启增焓 The second preset condition is: T 环 ≤T 开启增焓 -T 缓冲 , or f > f 开启增焓 -f 缓冲 , among which, T 环 The outdoor ambient temperature, T 开启增焓 The temperature at which enthalpy enhancement is triggered; f is the compressor frequency of the jet enthalpy enhancement system; f 开启增焓 The compressor frequency that triggers enthalpy increase is t comp t represents the cumulative runtime of the compressor in a single operation of the jet enthalpy enhancement system. 开启增焓 The cumulative duration of a single compressor cycle that triggers enthalpy increase is T. 缓冲 and f 缓冲 It is a constant.

11. The jet enthalpy control method as described in claim 9 or 10, characterized in that, If the parameter value of the enthalpy increase on / off determination parameter meets the first preset condition, then enthalpy increase is activated to enter the jet enthalpy increase heating mode, including: 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; Adjust the opening of the main electronic expansion valve to the first target opening; Adjust the opening of the enthalpy-increasing electronic expansion valve to the second target opening.

12. The jet enthalpy control method as described in claim 10, characterized in that, The step of shutting down enthalpy enhancement if the parameter value of the enthalpy enhancement on / off determination parameter meets the second preset condition, thereby exiting the jet enthalpy enhancement heating mode, includes: If f > f 开启增焓 Reduce the compressor frequency to f 开启增焓 -f 缓冲 If f≤f 开启增焓 Then the compressor frequency remains unchanged; The enthalpy-increasing electronic expansion valve will be closed after a preset time.

13. The jet enthalpy control method as described in claim 12, characterized in that, After the enthalpy-increasing electronic expansion valve is closed after a preset time, the jet enthalpy-increasing control method further includes: Obtain the exhaust temperature of the jet enthalpy enhancement system; If the exhaust temperature is greater than the preset temperature, the main electronic expansion valve is opened to a preset degree. If the exhaust temperature is less than or equal to the preset temperature, the opening of the main electronic expansion valve is kept unchanged.

14. A jet enthalpy control device, characterized in that, A vapor injection enthalpy enhancement system applied to air conditioners includes: The acquisition module is used to acquire the enthalpy-increasing superheat, total subcooling, exhaust superheat, and intake superheat of the jet enthalpy-increasing system when the jet enthalpy-increasing system is in jet enthalpy-increasing heating mode. The enthalpy-increasing superheat is the difference between the outlet temperature of the economizer auxiliary circuit and the inlet temperature of the economizer auxiliary circuit of the jet enthalpy-increasing system. The total subcooling is the difference between the condensing pressure saturation temperature and the economizer main circuit outlet temperature. The exhaust superheat is the difference between the exhaust temperature and the condensing pressure saturation temperature of the jet enthalpy-increasing system. The intake superheat is the difference between the intake temperature and the evaporating pressure saturation temperature of the jet enthalpy-increasing system. An adjustment module is used to adjust the opening of the enthalpy-increasing electronic expansion valve of the jet enthalpy-increasing system according to the relationship between the enthalpy-increasing superheat and a first preset range; and to adjust the opening of the main circuit electronic expansion valve of the jet enthalpy-increasing system according to at least one of the relationships between the total subcooling and a second preset range, the exhaust superheat and a third preset range, and the intake superheat and a fourth preset range. Adjusting the opening of the electronic expansion valve of the jet enthalpy enhancement system according to the relationship between the enthalpy superheat and the first preset range includes: If the enthalpy superheat is within the first preset range, the opening of the enthalpy-increasing electronic expansion valve remains unchanged; If the enthalpy superheat is less than the lower limit of the first preset range, then a first adjustment range is determined based on the enthalpy superheat, the lower limit of the first preset range, and the first preset formula, and the opening of the enthalpy electronic expansion valve is reduced by the first adjustment range. If the enthalpy superheat is greater than the upper limit of the first preset range, then a second adjustment range is determined based on the enthalpy superheat, the upper limit of the first preset range, and the second preset formula, and the opening of the enthalpy electronic expansion valve is increased by the second adjustment range. The first preset formula is: (T) f2 -ΔT1) / 2, the second preset formula is: (ΔT1-T) / 2, f1 ) / 2, where ΔT1 is the enthalpy superheat, T f1 T is the upper limit of the first preset range. f2 This is the lower limit of the first preset range.

15. An air conditioner, characterized in that, The device includes a jet enthalpy enhancement system, a processor, and a memory. The processor is signal-connected to both the jet enthalpy enhancement system and the memory. The memory stores computer-readable instructions. The processor invokes the computer-readable instructions stored in the memory and executes the jet enthalpy enhancement control method as described in any one of claims 1 to 13.

16. A storage medium, characterized in that, The device stores computer-readable instructions that are invoked by a processor to implement the jet enthalpy control method as described in any one of claims 1 to 13.

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