A gas-injection enthalpy-increasing heat pump air conditioner and its heating operation control method

Abstract

This invention relates to the field of heat pump technology, and in particular to a gas-injection enthalpy-increasing heat pump air conditioner and its heating operation control method. This control method can activate the gas-injection enthalpy-increasing function during heating operation if the outdoor ambient temperature is lower than a certain preset parameter. When the outdoor ambient temperature does not meet the activation conditions for the gas-injection enthalpy-increasing function, it can use the rate of increase in indoor ambient temperature to help determine whether the gas-injection enthalpy-increasing function needs to be activated. If the rate of increase in indoor ambient temperature is slow and the compressor exhaust temperature is lower than a certain preset parameter, the gas-injection enthalpy-increasing function can be forcibly activated to improve the heating effect and enhance thermal comfort during air conditioning use.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and in particular to a gas-injection enthalpy-increasing heat pump air conditioner and its heating operation control method. Background Technology

[0002] Air conditioners are widely used in people's work and life. Some existing air conditioners use compressors with gas replenishment and enthalpy enhancement functions, but when to turn on the gas replenishment and enthalpy enhancement function and how to control the amount of gas replenishment are often not well controlled.

[0003] The main principle of a compressor with a gas replenishment function is to set up a gas replenishment port (medium-pressure chamber) between the compressor's suction chamber and exhaust chamber. By replenishing gaseous refrigerant or a small amount of liquid refrigerant into the gas replenishment port (medium-pressure chamber), the refrigerant circulation volume can be increased and the refrigerant enthalpy value entering the outdoor heat exchanger can be reduced in heating mode, thereby improving the heating effect of the air conditioner.

[0004] In heating mode, when the outdoor ambient temperature is low, the throttling degree of the throttling mechanism is often set relatively large to enable the outdoor heat exchanger to absorb heat from the outside. This reduces the temperature of the refrigerant flowing through the outdoor heat exchanger and increases the temperature difference between the refrigerant and the air. However, an excessively large throttling degree will reduce the refrigerant circulation volume, thus affecting the heating effect of the air conditioner under low-temperature conditions. By injecting a small amount of gaseous refrigerant into the air inlet (medium-pressure chamber), the refrigerant circulation volume through the compressor is increased without reducing or slightly reducing the compressor discharge temperature. Furthermore, since some refrigerant enters the compressor air inlet (medium-pressure chamber) from the outlet at the top of the flash tank, the enthalpy of the gas-liquid two-phase refrigerant inside the flash tank is further reduced. This, in turn, reduces the enthalpy of the refrigerant entering the outdoor heat exchanger. Therefore, the heating capacity can be increased by enlarging the refrigerant heat exchanger and improving the heat exchange efficiency of the outdoor heat exchanger.

[0005] In heating mode, when the conditions for increasing enthalpy through gas replenishment are met, the compressor's exhaust temperature is often not very high. At this point, if gaseous refrigerant is added to the gas replenishment port (intermediate pressure chamber) to improve the unit's heating performance, an unreasonable amount of refrigerant replenishment can cause the following problems:

[0006] Excessive refrigerant replenishment: Too much refrigerant enters the gas inlet (medium-pressure chamber), causing the compressor exhaust temperature to drop too much. Even if the refrigerant circulation volume increases as a result, the reduced exhaust temperature leads to a smaller temperature difference between the refrigerant flowing through the indoor heat exchanger and the indoor air, thus reducing the heat exchange efficiency of the indoor heat exchanger. Consequently, the heating capacity may not be improved.

[0007] Insufficient gaseous refrigerant replenishment: If too little gaseous refrigerant enters the gas inlet (medium-pressure chamber), the increase in refrigerant circulation is limited, and the heating effect is not significantly improved. Summary of the Invention

[0008] To address the aforementioned problems, the present invention aims to provide a gas-injection enthalpy-increasing heat pump air conditioner and its heating operation control method, which can intelligently control the opening and closing of the gas injection function according to the current operating status of the air conditioner and reasonably adjust the gas injection amount.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A method for controlling the heating operation of a gas-injection enthalpy-increasing heat pump air conditioner, characterized in that:

[0011] This gas-injection enthalpy-increasing heat pump air conditioner includes a controller, an indoor unit, and an outdoor unit;

[0012] The indoor unit includes an indoor heat exchanger, an indoor ambient temperature sensor, an indoor heat exchanger temperature sensor, and an indoor fan;

[0013] The outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger, an outdoor fan, a first throttling mechanism, a second throttling mechanism, a flash tank, a two-way valve, an exhaust temperature sensor, an outdoor ambient temperature sensor, and an outdoor heat exchanger temperature sensor.

[0014] The indoor unit and the outdoor unit form a loop through the first refrigerant connection pipe and the second refrigerant connection pipe;

[0015] The flash tank has a first port, a second port, and a third port. The first port is located near the bottom of the flash tank, the second port is located near the bottom of the flash tank, and the third port is located near the top of the flash tank. The compressor has a gas inlet. The first port is connected to the outdoor heat exchanger, and the pipe between the outdoor heat exchanger and the first port is equipped with the first throttling mechanism. The second port is connected to the indoor heat exchanger through the first refrigerant connection pipe, and the first refrigerant connection pipe is equipped with the second throttling mechanism. The third port is connected to the gas inlet, and the pipe between the third port and the gas inlet is equipped with the two-way valve.

[0016] When the heat pump air conditioner is in cooling mode, the first pipe is the refrigerant inlet, the second pipe is the refrigerant outlet, and the third pipe is the gas or liquid replenishment outlet; when the heat pump air conditioner is in heating mode, the second pipe is the refrigerant inlet, the first pipe is the refrigerant outlet, and the third pipe is the gas or liquid replenishment outlet.

[0017] The heating operation control method includes the following steps:

[0018] S1:

[0019] Set B as the activation flag for gas replenishment and enthalpy enhancement. B=0 indicates that gas replenishment and enthalpy enhancement is not activated during the initial stage of heating operation, B=1 indicates that gas replenishment and enthalpy enhancement is activated during the initial stage of heating operation, and B=2 indicates that gas replenishment and enthalpy enhancement is activated when not in the initial stage of heating operation. Set Ti1 as the first recorded parameter of indoor ambient temperature. Set ts as the first time statistical parameter and t as the second time statistical parameter.

[0020] Turn on the air conditioner, receive the operating parameter information set by the user, set B=0, ts=0, t=0, determine whether the operating mode set by the user is the heating mode, if the operating mode set by the user is the heating mode, obtain the indoor ambient temperature Ti, set Ti1=Ti, count ts and t, obtain the set temperature Ts, indoor ambient temperature Ti, outdoor ambient temperature To, outdoor heat exchanger temperature Toe and compressor discharge temperature Td;

[0021] S2:

[0022] S2.1: Set S as the gas replenishment and enthalpy increase control flag. S=0 indicates that defrosting or overheating control is not required, S=1 indicates that defrosting control is required, and S=2 indicates that overheating control is required.

[0023] The controller compares the outdoor ambient temperature To with the preset temperature threshold a:

[0024] If To ≤ a, continue to check whether the gas replenishment enthalpy control flag S is equal to 1:

[0025] ① If S=1, obtain the indoor ambient temperature Ti, and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti≥e, return to S1; if Ts-Ti<e, turn off the gas replenishment and enthalpy increase function.

[0026] ②If S≠1, determine whether the value of the enthalpy-increasing flag B is equal to 0:

[0027] If B=0, set the gas replenishment and enthalpy increase activation flag B=1 to activate the gas replenishment and enthalpy increase function;

[0028] If B≠0 and B=2, determine whether the outdoor heat exchanger frosts quickly:

[0029] If the frost formation rate is determined to be fast, the indoor ambient temperature Ti is obtained, and the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, is calculated. Ts-Ti is compared with the preset temperature difference judgment threshold e, and the indoor ambient temperature Ti is compared with the preset judgment threshold i. If Ts-Ti≥e or Ti≤i, the gas replenishment enthalpy control flag S=0; if Ts-Ti<e and Ti>i, the gas replenishment enthalpy on flag B=1, and the gas replenishment enthalpy function is turned off.

[0030] If the frost formation rate is determined to be slow, the compressor discharge temperature Td is compared with the preset temperature judgment threshold g:

[0031] If Td≥g, set the enthalpy increase activation flag B=2 and disable the enthalpy increase activation function;

[0032] If Td < g and S = 2, continue to compare the compressor exhaust temperature Td with the preset temperature judgment threshold h. If Td ≤ h, obtain the indoor ambient temperature Ti and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti ≥ e, activate the gas replenishment and enthalpy increase function.

[0033] S2.2: If To > a, compare the statistical time parameter ts with the preset time judgment threshold b. If ts ≥ b, determine whether the air conditioner needs to defrost. If the air conditioner does not need to defrost, determine the value of the gas replenishment and enthalpy increase start flag B. If B = 0, count the time t.

[0034] S3:

[0035] Set Ti2 as the second recorded parameter for indoor ambient temperature;

[0036] Compare the statistical time parameter t with the preset time judgment threshold c. If t≥c, obtain the indoor ambient temperature Ti, let Ti2=Ti, calculate ΔTi=Ti2-Ti1, and calculate ΔT=Ts-Ti.

[0037] S4:

[0038] Let Rf be the indoor fan speed setting, and the indoor fan has three speed settings: low, medium, and high.

[0039] The calculated ΔTi is compared with the preset temperature difference judgment threshold d.

[0040] If △Ti≥d,

[0041] ① Compare the calculated ΔT with the preset temperature difference judgment threshold f. If ΔT≥f, continue operating according to the current state.

[0042] ②If △T < f, activate the enthalpy-increasing function;

[0043] If △Ti < d

[0044] Compare ΔT with the preset temperature difference threshold e. If ΔT ≥ e, obtain the compressor discharge temperature Td and Rf. Continue to compare the compressor discharge temperature Td with the preset temperature threshold h. If Td < h, set the gas injection enthalpy enhancement activation flag B = 2, obtain the current compressor input power P, and then activate the gas injection enthalpy enhancement. Adjust the opening degree P1 of the first throttling mechanism and the opening degree P2 of the second throttling mechanism to obtain the current compressor input power P'. Calculate α = P' / P. Compare the calculated α value with the preset parameters. If α meets the preset conditions, return to S1. If α does not meet the preset conditions, adjust the opening degrees of P1 and P2 until α meets the preset conditions.

[0045] Preferably, in S2.2, if the air conditioner needs to defrost, the air conditioner will start defrosting. The controller will determine whether the defrosting is complete. If defrosting is complete, the air supply enthalpy control flag S=0. If defrosting is not complete, the air conditioner will run in defrosting mode until it is complete.

[0046] As a preferred option, in S2.2, if ts < b, then return to S1 to continue counting ts and t; in S3, if t < c, then continue counting time t until t ≥ c.

[0047] As a preferred option, in S4, if △T < e, the air conditioner continues to operate according to the current state.

[0048] As a preferred option, in S4, if Td≥h, then return to S1.

[0049] A gas-injection enthalpy-increasing heat pump air conditioner, applied to the heating operation control method of a gas-injection enthalpy-increasing heat pump air conditioner described in any one of the above.

[0050] Preferably, the controller includes an indoor control mechanism and an outdoor control mechanism that can communicate with each other and control the indoor unit and the outdoor unit respectively.

[0051] Preferably, the indoor control mechanism includes a user information receiving module, a first operation information acquisition module, a first operation status judgment module, a first operation status control module, a first operation status information storage module, a first time statistics module, and a first information sending / receiving module; wherein:

[0052] The user information receiving module is suitable for receiving the air conditioner operation status setting parameters set by the user;

[0053] The first operation information acquisition module is suitable for acquiring the operation status information of each component in the indoor unit;

[0054] The first operating status judgment module is suitable for judging the operating status of the indoor unit.

[0055] The first operating status control module is suitable for controlling the operating status of various components in the indoor unit;

[0056] The first operating status information storage module is suitable for storing the operating status information of the indoor unit;

[0057] The first-time statistics module is suitable for calculating the operating time of the indoor unit in various operating modes and states.

[0058] The first information sending / receiving module is suitable for communicating with the outdoor control mechanism.

[0059] Preferably, the outdoor control mechanism includes a second operating status acquisition module, a second operating status judgment module, a second operating status control module, a second operating status information storage module, a second time statistics module, and a second information sending / receiving module; wherein...

[0060] The second operating status acquisition module is suitable for acquiring the operating status information of various components in the outdoor unit;

[0061] The second operating status judgment module is suitable for judging the operating status of the outdoor unit.

[0062] The second operating status control module is suitable for controlling the operating status of various components in the outdoor unit.

[0063] The second operating status information storage module is suitable for storing the operating status information of the outdoor unit;

[0064] The second time statistics module is suitable for calculating the operating time of the outdoor unit in various operating modes and operating states.

[0065] The second information sending / receiving module is suitable for communicating with the indoor control mechanism.

[0066] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0067] 1. During heating operation, if the outdoor ambient temperature is lower than a certain preset parameter, the gas replenishment and enthalpy increase function will be activated.

[0068] 2. When the outdoor ambient temperature does not meet the conditions for opening the gas replenishment and enthalpy enhancement function, it can use the rate of increase of indoor ambient temperature to help determine whether the gas replenishment and enthalpy enhancement function needs to be opened. If the rate of increase of indoor ambient temperature is slow and the compressor exhaust temperature is less than a certain preset parameter, the gas replenishment and enthalpy enhancement function can be forcibly opened to improve the heating effect and enhance the thermal comfort during the use of air conditioning.

[0069] 3. After the forced gas replenishment and enthalpy enhancement function is activated, the forced gas replenishment and enthalpy enhancement mode can be deactivated based on conditions such as the compressor discharge temperature, the difference between the indoor ambient temperature and the set temperature: the gas replenishment and enthalpy enhancement function is deactivated when the compressor discharge temperature is too high; the gas replenishment and enthalpy enhancement function is deactivated when the difference between the indoor ambient temperature and the set temperature is small; the gas replenishment and enthalpy enhancement function is deactivated when the outdoor heat exchanger frosts quickly and the indoor ambient temperature is higher than a certain preset temperature; this effectively increases the heating capacity while avoiding abnormal situations caused by excessively harsh operating conditions of the entire unit.

[0070] 4. When the outdoor ambient temperature does not meet the conditions for activating the gas replenishment and enthalpy enhancement function, but the indoor ambient temperature rises slowly, and the gas replenishment and enthalpy enhancement function is forcibly activated, if a rapid frosting rate is detected:

[0071] ① If the indoor ambient temperature is close to the set temperature or higher than a certain value, it is determined that the indoor temperature can basically meet the user's needs. At this time, the gas replenishment and enthalpy increase function is turned off to avoid the outdoor heat exchanger frosting speed being accelerated and the indoor heat exchanger heating effect being reduced if the gas replenishment and enthalpy increase function is continued to be turned on, thereby improving the user experience.

[0072] ② If the indoor ambient temperature is not close to the set temperature or is not higher than a certain value, it is determined that the indoor temperature does not meet the user's needs. Turning off the gas replenishment and enthalpy enhancement operation can slow down the frosting speed of the outdoor heat exchanger in the short term, but it cannot effectively improve the heating effect in the long term. The long-term operation effect is not obvious. It is better to continue to turn on the gas replenishment and enthalpy enhancement function to make the outdoor heat exchanger quickly enter the defrosting stage. By defrosting, the heat exchange efficiency of the outdoor heat exchanger can be improved, thereby improving the user experience.

[0073] 5. After forcibly activating the gas replenishment and enthalpy enhancement function, the gas replenishment amount can be adjusted by detecting the change in compressor power before and after activation.

[0074] 6. When the gas replenishment and enthalpy increase function is forcibly activated, the gas replenishment amount is adjusted according to the current operating conditions:

[0075] ①The lower the indoor temperature, the more gas is needed;

[0076] ②The lower the outdoor ambient temperature, the more gas is needed;

[0077] ③ The higher the indoor wind speed, the more air is supplied. Attached Figure Description

[0078] Figure 1 This is a schematic diagram of the structure of the gas-injection enthalpy-increasing heat pump air conditioner involved in this invention.

[0079] Figure 2 This is a schematic diagram of the control mechanism involved in the present invention.

[0080] Figure 3 This is a schematic diagram of the compressor air supply control coefficient involved in the present invention.

[0081] Figure 4 This is a schematic diagram of the heating operation control logic involved in the present invention. Detailed Implementation

[0082] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0083] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more, unless explicitly defined otherwise.

[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0086] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Example 1:

[0087] like Figures 3-4 The method for controlling the heating operation of a gas-injection enthalpy-increasing heat pump air conditioner, as shown, includes the following steps:

[0088] S1:

[0089] Set B as the activation flag for gas replenishment and enthalpy enhancement. B=0 indicates that gas replenishment and enthalpy enhancement is not activated during the initial stage of heating operation, B=1 indicates that gas replenishment and enthalpy enhancement is activated during the initial stage of heating operation, and B=2 indicates that gas replenishment and enthalpy enhancement is activated when not in the initial stage of heating operation. Set Ti1 as the first recorded parameter of indoor ambient temperature. Set ts as the first time statistical parameter and t as the second time statistical parameter.

[0090] Turn on the air conditioner, receive the operating parameter information set by the user, set B=0, ts=0, t=0, determine whether the operating mode set by the user is the heating mode, if the operating mode set by the user is the heating mode, obtain the indoor ambient temperature Ti, set Ti1=Ti, count ts and t, obtain the set temperature Ts, indoor ambient temperature Ti, outdoor ambient temperature To, outdoor heat exchanger temperature Toe and compressor discharge temperature Td;

[0091] S2:

[0092] S2.1: Set S as the gas replenishment and enthalpy increase control flag. S=0 indicates that defrosting or overheating control is not required, S=1 indicates that defrosting control is required, and S=2 indicates that overheating control is required.

[0093] The controller compares the outdoor ambient temperature To with the preset temperature threshold a:

[0094] If To ≤ a, continue to check whether the gas replenishment enthalpy control flag S is equal to 1:

[0095] ① If S=1, obtain the indoor ambient temperature Ti, and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti≥e, return to S1; if Ts-Ti<e, turn off the gas replenishment and enthalpy increase function.

[0096] ②If S≠1, determine whether the value of the enthalpy-increasing flag B is equal to 0:

[0097] If B=0, set the gas replenishment and enthalpy increase activation flag B=1 to activate the gas replenishment and enthalpy increase function;

[0098] If B≠0 and B=2, determine whether the outdoor heat exchanger frosts quickly:

[0099] If the frost formation rate is determined to be fast, the indoor ambient temperature Ti is obtained, and the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, is calculated. Ts-Ti is compared with the preset temperature difference judgment threshold e, and the indoor ambient temperature Ti is compared with the preset judgment threshold i. If Ts-Ti≥e or Ti≤i, the gas replenishment enthalpy control flag S=0; if Ts-Ti<e and Ti>i, the gas replenishment enthalpy on flag B=1, and the gas replenishment enthalpy function is turned off.

[0100] If the frost formation rate is determined to be slow, the compressor discharge temperature Td is compared with the preset temperature judgment threshold g:

[0101] If Td≥g, set the enthalpy increase activation flag B=2 and disable the enthalpy increase activation function;

[0102] If Td < g and S = 2, continue to compare the compressor exhaust temperature Td with the preset temperature judgment threshold h. If Td ≤ h, obtain the indoor ambient temperature Ti and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti ≥ e, activate the gas replenishment and enthalpy increase function.

[0103] S2.2: If To > a, compare the statistical time parameter ts with the preset time judgment threshold b. If ts ≥ b, determine whether the air conditioner needs to defrost. If the air conditioner does not need to defrost, determine the value of the gas replenishment and enthalpy increase start flag B. If B = 0, count the time t.

[0104] S3:

[0105] Set Ti2 as the second recorded parameter for indoor ambient temperature;

[0106] Compare the statistical time parameter t with the preset time judgment threshold c. If t≥c, obtain the indoor ambient temperature Ti, let Ti2=Ti, calculate ΔTi=Ti2-Ti1, and calculate ΔT=Ts-Ti.

[0107] S4:

[0108] Let Rf be the indoor fan speed setting, and the indoor fan has three speed settings: low, medium, and high.

[0109] The calculated ΔTi is compared with the preset temperature difference judgment threshold d.

[0110] If △Ti≥d,

[0111] ① Compare the calculated ΔT with the preset temperature difference judgment threshold f. If ΔT≥f, continue operating according to the current state.

[0112] ②If △T < f, activate the enthalpy-increasing function;

[0113] If △Ti < d

[0114] Compare ΔT with the preset temperature difference threshold e. If ΔT ≥ e, obtain the compressor discharge temperature Td and Rf. Continue to compare the compressor discharge temperature Td with the preset temperature threshold h. If Td < h, set the gas injection enthalpy enhancement activation flag B = 2, obtain the current compressor input power P, and then activate the gas injection enthalpy enhancement. Adjust the opening degree P1 of the first throttling mechanism and the opening degree P2 of the second throttling mechanism to obtain the current compressor input power P'. Calculate α = P' / P. Compare the calculated α value with the preset parameters. If α meets the preset conditions, return to S1. If α does not meet the preset conditions, adjust the opening degrees of P1 and P2 until α meets the preset conditions.

[0115] Furthermore, in S2.2, if the air conditioner needs to defrost, the air conditioner will start defrosting. The controller will determine whether the defrosting is complete. If defrosting is complete, the air supply enthalpy control flag S=0; if defrosting is not complete, the air conditioner will run in defrosting mode until it is complete.

[0116] Furthermore, in S2.2, if ts < b, then return to S1 to continue counting ts and t; in S3, if t < c, then continue counting time t until t ≥ c.

[0117] Furthermore, in S4, if △T < e, the air conditioner continues to operate according to its current state.

[0118] Furthermore, in S4, if Td≥h, then return to S1.

[0119] like Figure 4 The specific control logic of the heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner is as follows:

[0120] S1: Start the program, then proceed to step S2;

[0121] S2: Receive the operating parameter information set by the user, set B=0, ts=0, t=0, and then proceed to step S3;

[0122] S3: Determine whether the operating mode set by the user is the heating mode. If the operating mode set by the user is the heating mode, proceed to step S4; otherwise, proceed to step S47.

[0123] S4: Obtain the indoor ambient temperature Ti, set Ti1=Ti, and then proceed to step S5;

[0124] S5: Calculate ts and t, then proceed to step S6;

[0125] S6: Obtain the set temperature Ts, indoor ambient temperature Ti, outdoor ambient temperature To, outdoor heat exchanger temperature Toe, and compressor discharge temperature Td, and then proceed to step S7;

[0126] S7: Compare the outdoor ambient temperature To with the preset temperature judgment threshold a. If To ≤ a, proceed to step S25; otherwise, proceed to step S8.

[0127] S8: Compare the statistical time parameter ts with the preset time judgment threshold b. If ts≥b, proceed to step S9; otherwise, proceed to step S5.

[0128] S9: Determine whether the air conditioner needs defrosting (this can be determined based on the detected Toe data). If it is determined that the air conditioner needs defrosting, proceed to step S22; otherwise, proceed to step S10.

[0129] S10: Determine the value of the gas replenishment and enthalpy increase start mark. If B=0, proceed to step S11; otherwise, proceed to step S30.

[0130] S11: Calculate the time t, then proceed to step S12;

[0131] S12: Compare the statistical time parameter t with the preset time judgment threshold c. If t≥c, proceed to step S13; otherwise, proceed to step S11.

[0132] S13: Obtain the indoor ambient temperature Ti, let Ti2=Ti, calculate ΔTi (ΔTi=Ti2-Ti1), calculate ΔT (ΔT=Ts-Ti), and then proceed to step S14;

[0133] S14: Compare the calculated ΔTi with the preset temperature difference judgment threshold d. If ΔTi≥d, proceed to step S35; otherwise, proceed to step S15.

[0134] S15: Compare the calculated ΔT with the preset temperature difference judgment threshold e. If ΔT≥e, proceed to step S16; otherwise, proceed to step S36.

[0135] S16: Obtain the compressor discharge temperature Td and Rf, then proceed to step S17;

[0136] S17: Compare the compressor exhaust temperature Td with the preset temperature judgment threshold h. If Td≥h, proceed to step S6; otherwise, proceed to step S18.

[0137] S18: Set the gas injection enthalpy enhancement start flag B=2, obtain the current compressor input power P, then start the gas injection enthalpy enhancement, and proceed to step S19;

[0138] S19: Adjust the opening degree P1 of the first throttling mechanism, adjust the opening degree P2 of the second throttling mechanism, and then proceed to step S20;

[0139] S20: Obtain the current compressor input power P', calculate α (α=P' / P), and then proceed to step S21;

[0140] S21: Compare the calculated α value with the preset parameters. If α meets the preset conditions, proceed to step S6; otherwise, proceed to step S19.

[0141] S22: The air conditioner starts defrosting, and then proceeds to step S23;

[0142] S23: Determine whether the air conditioner has completed defrosting. If defrosting is complete, proceed to step S24; otherwise, proceed to step S22.

[0143] S24: Set the gas replenishment enthalpy control flag S=0, and then proceed to step S6;

[0144] S25: Determine whether the gas replenishment enthalpy control flag S is equal to 1. If S=1, proceed to step S26; otherwise, proceed to step S29.

[0145] S26: Obtain the indoor ambient temperature Ti, and calculate the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, and then proceed to step S27;

[0146] S27: Compare the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, with the preset temperature difference judgment threshold e. If Ts-Ti≥e, proceed to step S6; otherwise, proceed to step S28.

[0147] S28: Turn off the gas replenishment and enthalpy increase function, and then proceed to step S6;

[0148] S29: Determine whether the value of the gas replenishment and enthalpy increase start flag B is equal to 0. If B=0, proceed to step S37; otherwise, proceed to step S30.

[0149] S30: Determine whether the value of the gas replenishment and enthalpy increase start mark B is equal to 2. If B=2, proceed to step S31; otherwise, proceed to step S6.

[0150] S31: Determine whether the outdoor heat exchanger is frosting fast (the rate of temperature drop of the outdoor heat exchanger Toe can be used to determine this; a larger drop rate indicates a faster frosting speed). If the frosting speed is determined to be fast, proceed to step S32; otherwise, proceed to step S38.

[0151] S32: Obtain the indoor ambient temperature Ti, calculate the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, and then proceed to step S33;

[0152] S33: Compare the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, with the preset temperature difference judgment threshold e, and compare the indoor ambient temperature Ti with the preset judgment threshold i. If Ts-Ti≥e or Ti≤i, proceed to step S34; otherwise, proceed to step S40.

[0153] S34: Set the gas replenishment enthalpy control flag S=0, and then proceed to step S6;

[0154] S35: Compare the calculated difference between the set temperature and the indoor ambient temperature, Ts-Ti, with the preset temperature difference judgment threshold f. If △T≥f, proceed to step S41; otherwise, proceed to step S36.

[0155] S36: Continue operating according to the current state, and then proceed to step S6;

[0156] S37: Set the gas replenishment and enthalpy increase start flag B=1, and then proceed to step S46;

[0157] S38: Compare the compressor discharge temperature Td with the preset temperature judgment threshold g. If Td≥g, proceed to step S39; otherwise, proceed to step S42.

[0158] S39: Set the gas replenishment and enthalpy increase activation mark B=2, turn off the gas replenishment and enthalpy increase function, and then proceed to step S6;

[0159] S40: Set the gas replenishment enthalpy increase activation flag B=1, turn off the gas replenishment enthalpy increase function, and then proceed to step S6;

[0160] S41: Activate the Qi replenishment and enthalpy increase function, and then proceed to step S6;

[0161] S42: Determine whether the gas replenishment enthalpy control flag S is equal to 2. If S=2, proceed to step S43; otherwise, proceed to step S6.

[0162] S43: Compare the compressor discharge temperature Td with the preset temperature judgment threshold h. If Td≤h, proceed to step S44; otherwise, proceed to step S6.

[0163] S44: Obtain the indoor ambient temperature Ti, calculate the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, and then proceed to step S45;

[0164] S45: Compare the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, with the preset temperature difference judgment threshold e. If Ts-Ti≥e, proceed to step S46; otherwise, proceed to step S6.

[0165] S46: Activate the Qi replenishment and enthalpy increase function, and then proceed to step S6;

[0166] S47: End the program.

[0167] Symbol explanation:

[0168] To: Outdoor ambient temperature, °C;

[0169] Ti: Indoor ambient temperature, °C;

[0170] Ts: Set temperature, °C;

[0171] Toe: Outdoor heat exchanger temperature, °C;

[0172] Td: Compressor discharge temperature, °C;

[0173] Ti1: The first recorded parameter of indoor ambient temperature, in °C;

[0174] Ti2: The second recorded parameter of indoor ambient temperature, in °C;

[0175] Rf: Indoor fan speed setting. This example uses an indoor fan with three speed settings: low, medium, and high.

[0176] ts: Statistical parameters at the first time step, min;

[0177] t: Second time-time statistical parameter, min;

[0178] a: Temperature judgment threshold, such as a preset to 7℃;

[0179] b: Time threshold, such as b is preset to 5 minutes;

[0180] c: Time threshold, such as c preset to 10min;

[0181] d: Temperature difference judgment threshold, such as d preset to 2℃;

[0182] e: Temperature difference judgment threshold, e is preset to 2℃;

[0183] f: Temperature difference judgment threshold, such as f preset to 5℃;

[0184] g: Exhaust temperature judgment threshold, such as g preset to 100℃;

[0185] h: The threshold for judging exhaust temperature, such as h being preset to 90℃;

[0186] i: Indoor ambient temperature judgment threshold, i is preset to 24℃;

[0187] △Ti: Indoor ambient temperature difference, °C, △Ti = Ti2 - Ti1;

[0188] △T: The difference between the set temperature and the indoor ambient temperature, in °C, △T = Ts - Ti;

[0189] B: The indicator for the activation of gas replenishment and enthalpy enhancement. B=0 indicates that gas replenishment and enthalpy enhancement was not activated during the initial stage of heating operation. B=1 indicates that gas replenishment and enthalpy enhancement was activated during the initial stage of heating operation. B=2 indicates that gas replenishment and enthalpy enhancement was activated when it was not in the initial stage of heating operation.

[0190] S: Gas replenishment and enthalpy increase control flag. S=0 indicates that defrosting or overheating control is not required, S=1 indicates that defrosting control is required, and S=2 indicates that overheating control is required.

[0191] P: Compressor power, W;

[0192] P': Compressor power, W;

[0193] P1: First throttling mechanism opening, step;

[0194] P2: Opening degree of the second throttling mechanism, step;

[0195] α: Compressor power determination coefficient, α=P' / P; Example 2:

[0196] like Figures 1-2 The above-described gas-injection enthalpy-increasing heat pump air conditioner is applied to the heating operation control method of the gas-injection enthalpy-increasing heat pump air conditioner in the first embodiment above. The gas-injection enthalpy-increasing heat pump air conditioner 1 includes a controller, an indoor unit 10 and an outdoor unit 20.

[0197] The indoor unit 10 includes an indoor heat exchanger 101, an indoor ambient temperature sensor 102, an indoor heat exchanger temperature sensor 103, and an indoor fan 104.

[0198] The outdoor unit 20 includes a compressor 201, a four-way reversing valve 202, an outdoor heat exchanger 203, an outdoor fan 204, a first throttling mechanism 205, a second throttling mechanism 206, a flash tank 207, a two-way valve 208, an exhaust temperature sensor 209, an outdoor ambient temperature sensor 210, and an outdoor heat exchanger temperature sensor 211.

[0199] The indoor unit 10 and the outdoor unit 20 form a circuit through the first refrigerant connection pipe 30 and the second refrigerant connection pipe 40;

[0200] The flash tank 207 has a first port 7a, a second port 7b, and a third port 7c. The first port 7a is located near the bottom of the flash tank 207, the second port 7b is located near the bottom of the flash tank 207, and the third port 7c is located near the top of the flash tank 207. The compressor 201 has a gas supply port 1a. The first port 7a is connected to the outdoor heat exchanger 203, and the pipe between the outdoor heat exchanger 203 and the first port 7a is provided with the first throttling mechanism 205. The second port 7b is connected to the indoor heat exchanger 101 through the first refrigerant connection pipe 30, and the first refrigerant connection pipe 30 is provided with the second throttling mechanism 206. The third port 7c is connected to the gas supply port 1a, and the pipe between the third port 7c and the gas supply port 1a is provided with the two-way valve 208.

[0201] The first throttling mechanism 205 and the second throttling mechanism 206 involved in this invention can be flow-adjustable electronic expansion valves (or other flow-adjustable throttling mechanisms). During refrigeration operation, the throttling mechanism automatically adjusts according to the actual operating state of the unit, and its adjustment method can be controlled according to the target exhaust temperature, target exhaust superheat, etc. In this invention, the throttling mechanism is described in terms of an electronic expansion valve, and the electronic expansion valve is described in terms of target exhaust temperature control.

[0202] The two-way valve 208 involved in this invention has two states: open and closed. When the two-way valve 208 is open, refrigerant can flow inside it; when the two-way valve 208 is closed, refrigerant cannot flow inside it.

[0203] When the heat pump air conditioner is in cooling operation, the first port 7a is the refrigerant inlet, the second port 7b is the refrigerant outlet, and the third port 7c is the gas or liquid replenishment outlet; when the heat pump air conditioner is in heating operation, the second port 7b is the refrigerant inlet, the first port 7a is the refrigerant outlet, and the third port 7c is the gas or liquid replenishment outlet.

[0204] Furthermore, the controller includes an indoor control mechanism 105 and an outdoor control mechanism 212 that are capable of communicating with each other and controlling the indoor unit 10 and the outdoor unit 20 respectively.

[0205] Further, the indoor control mechanism 105 includes a user information receiving module 1051, a first operation information acquisition module 1052, a first operation status judgment module 1053, a first operation status control module 1054, a first operation status information storage module 1055, a first time statistics module 1056, and a first information sending / receiving module 1057; wherein:

[0206] User information receiving module 1051 is adapted to receive air conditioner operation status setting parameters set by the user;

[0207] The first operation information acquisition module 1052 is adapted to acquire the operation status information of each component in the indoor unit 10.

[0208] The first operating status judgment module 1053 is suitable for judging the operating status of the indoor unit 10 (such as the difference between the indoor temperature and the set temperature, the indoor heating or cooling rate, etc.).

[0209] The first operating status control module 1054 is suitable for controlling the operating status of each component in the indoor unit 10.

[0210] The first operating status information storage module 1055 is adapted to store the operating status information of the indoor unit 10.

[0211] The first-time statistics module 1056 is suitable for calculating the operating time of the indoor unit 10 in various operating modes and operating states.

[0212] The first information sending / receiving module 1057 is adapted to communicate with the outdoor control mechanism 212.

[0213] Furthermore, the outdoor control mechanism 212 includes a second operating status acquisition module 2121, a second operating status judgment module 2122, a second operating status control module 2123, a second operating status information storage module 2124, a second time statistics module 2125, and a second information sending / receiving module 2126; wherein,

[0214] The second operating status acquisition module 2121 is adapted to acquire the operating status information of each component in the outdoor unit 20.

[0215] The second operating status judgment module 2122 is suitable for judging the operating status of the outdoor unit 20 (such as whether the compressor exhaust temperature exceeds the limit).

[0216] The second operating status control module 2123 is suitable for controlling the operating status of each component in the outdoor unit 20.

[0217] The second operating status information storage module 2124 is adapted to store the operating status information of the outdoor unit 20.

[0218] The second time statistics module 2125 is suitable for statistics of the operating time of the outdoor unit in various operating modes and operating states.

[0219] The second information sending / receiving module 2126 is adapted to communicate with the indoor control mechanism 105.

[0220] In this specific embodiment, in response to the problem that existing gas-injection enthalpy-increasing heat pump air conditioners cannot effectively adjust the gas injection volume in heating mode, the above control method activates the gas injection enthalpy-increasing function when the outdoor ambient temperature is lower than a certain preset parameter during heating operation.

[0221] When the outdoor ambient temperature does not meet the conditions for activating the gas replenishment and enthalpy enhancement function, the system can use the rate of indoor temperature rise to help determine whether the gas replenishment and enthalpy enhancement function needs to be activated. If the indoor ambient temperature rises slowly and the compressor exhaust temperature is lower than a certain preset parameter, the gas replenishment and enthalpy enhancement function can be forcibly activated to improve the heating effect and enhance the thermal comfort during air conditioning use.

[0222] After the forced activation of the gas replenishment and enthalpy enhancement function, the forced gas replenishment and enthalpy enhancement mode can be exited based on conditions such as the compressor exhaust temperature, the difference between the indoor ambient temperature and the set temperature: the gas replenishment and enthalpy enhancement function is turned off when the compressor exhaust temperature is too high; the gas replenishment and enthalpy enhancement function is turned off when the difference between the indoor ambient temperature and the set temperature is small; the gas replenishment and enthalpy enhancement function is turned off when the outdoor heat exchanger frosts quickly and the indoor ambient temperature is higher than a certain preset temperature; this effectively increases the heating capacity while avoiding abnormal situations caused by excessively harsh operating conditions of the whole machine.

[0223] When the outdoor ambient temperature does not meet the conditions for activating the gas replenishment and enthalpy enhancement function, but the indoor ambient temperature rises slowly, and the gas replenishment and enthalpy enhancement function is forcibly activated, if a rapid frosting rate is detected:

[0224] ① If the indoor ambient temperature is close to the set temperature or higher than a certain value, it is determined that the indoor temperature basically meets the user's needs. At this time, the gas replenishment and enthalpy enhancement function is turned off to avoid accelerating the frosting rate of the outdoor heat exchanger and reducing the heating effect of the indoor heat exchanger, thus improving the user experience. ② If the indoor ambient temperature is not close to the set temperature or higher than a certain value, it is determined that the indoor temperature does not meet the user's needs. Turning off the gas replenishment and enthalpy enhancement function can slow down the frosting rate of the outdoor heat exchanger in the short term, but it cannot effectively improve the heating effect in the long term. The long-term effect is not obvious. It is better to continue to turn on the gas replenishment and enthalpy enhancement function to allow the outdoor heat exchanger to quickly enter defrosting mode. Through defrosting, the heat exchange efficiency of the outdoor heat exchanger is improved, thus improving the user experience.

[0225] After the gas replenishment and enthalpy enhancement function is forcibly activated, the amount of gas replenishment can be adjusted by detecting the change in compressor power before and after gas replenishment is activated.

[0226] When the gas replenishment and enthalpy increase function is forcibly activated, the gas replenishment amount is adjusted according to the current operating conditions:

[0227] ①The lower the indoor temperature, the more gas is needed;

[0228] ②The lower the outdoor ambient temperature, the more gas is needed;

[0229] ③ The higher the indoor wind speed, the more air is supplied.

[0230] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0231] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A method for controlling the heating operation of a gas-injection enthalpy-increasing heat pump air conditioner, characterized in that: The gas-filled enthalpy-increasing heat pump air conditioner (1) includes a controller, an indoor unit (10), and an outdoor unit (20). The indoor unit (10) includes an indoor heat exchanger (101), an indoor ambient temperature sensor (102), an indoor heat exchanger temperature sensor (103), and an indoor fan (104). The outdoor unit (20) includes a compressor (201), a four-way reversing valve (202), an outdoor heat exchanger (203), an outdoor fan (204), a first throttling mechanism (205), a second throttling mechanism (206), a flash tank (207), a two-way valve (208), an exhaust temperature sensor (209), an outdoor ambient temperature sensor (210), and an outdoor heat exchanger temperature sensor (211). The indoor unit (10) and the outdoor unit (20) form a circuit through the first refrigerant connection pipe (30) and the second refrigerant connection pipe (40); The flash tank (207) has a first port (7a), a second port (7b), and a third port (7c). The first port (7a) is located near the bottom of the flash tank (207), the second port (7b) is located near the bottom of the flash tank (207), and the third port (7c) is located near the top of the flash tank (207). The compressor (201) has a gas supply port (1a). The first port (7a) is connected to the outdoor heat exchanger (203). Furthermore, the outdoor heat exchanger (203) and the first port (7a) are provided with the first throttling mechanism (205); the second port (7b) is connected to the indoor heat exchanger (101) through the first refrigerant connection pipe (30), and the first refrigerant connection pipe (30) is provided with the second throttling mechanism (206); the third port (7c) is connected to the air supply port (1a), and the pipe between the third port (7c) and the air supply port (1a) is provided with the two-way valve (208). When the heat pump air conditioner is in cooling operation, the first pipe port (7a) is the refrigerant inlet, the second pipe port (7b) is the refrigerant outlet, and the third pipe port (7c) is the gas or liquid replenishment outlet; when the heat pump air conditioner is in heating operation, the second pipe port (7b) is the refrigerant inlet, the first pipe port (7a) is the refrigerant outlet, and the third pipe port (7c) is the gas or liquid replenishment outlet. The heating operation control method includes the following steps: S1: Set B as the activation flag for gas replenishment and enthalpy enhancement. B=0 indicates that gas replenishment and enthalpy enhancement is not activated during the initial stage of heating operation, B=1 indicates that gas replenishment and enthalpy enhancement is activated during the initial stage of heating operation, and B=2 indicates that gas replenishment and enthalpy enhancement is activated when it is not the initial stage of heating operation. Let Ti1 be the first recorded parameter of indoor ambient temperature; let ts be the first time-time statistical parameter, and t be the second time-time statistical parameter; Turn on the air conditioner, receive the operating parameter information set by the user, set B=0, ts=0, t=0, determine whether the operating mode set by the user is the heating mode, if the operating mode set by the user is the heating mode, obtain the indoor ambient temperature Ti, set Ti1=Ti, count ts and t, obtain the set temperature Ts, indoor ambient temperature Ti, outdoor ambient temperature To, outdoor heat exchanger temperature Toe and compressor discharge temperature Td; S2: S2.1: Set S as the gas replenishment and enthalpy increase control flag. S=0 indicates that defrosting or overheating control is not required, S=1 indicates that defrosting control is required, and S=2 indicates that overheating control is required. The controller compares the outdoor ambient temperature To with the preset temperature threshold a: If To ≤ a, continue to check whether the gas replenishment enthalpy control flag S is equal to 1: ① If S=1, obtain the indoor ambient temperature Ti, and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti≥e, return to S1; if Ts-Ti<e, turn off the gas replenishment and enthalpy increase function. ②If S≠1, determine whether the value of the enthalpy-increasing flag B is equal to 0: If B=0, set the gas replenishment and enthalpy increase activation flag B=1 to activate the gas replenishment and enthalpy increase function; If B≠0 and B=2, determine whether the outdoor heat exchanger frosts quickly: If the frost formation rate is determined to be fast, the indoor ambient temperature Ti is obtained, and the difference between the set temperature Ts and the indoor ambient temperature Ti, Ts-Ti, is calculated. Ts-Ti is compared with the preset temperature difference judgment threshold e, and the indoor ambient temperature Ti is compared with the preset judgment threshold i. If Ts-Ti≥e or Ti≤i, the gas replenishment enthalpy control flag S=0; if Ts-Ti<e and Ti>i, the gas replenishment enthalpy on flag B=1, and the gas replenishment enthalpy function is turned off. If the frost formation rate is determined to be slow, the compressor discharge temperature Td is compared with the preset temperature threshold g: If Td≥g, set the enthalpy increase activation flag B=2 and disable the enthalpy increase activation function; If Td < g and S = 2, continue to compare the compressor exhaust temperature Td with the preset temperature judgment threshold h. If Td ≤ h, obtain the indoor ambient temperature Ti and calculate the difference Ts-Ti between the set temperature Ts and the indoor ambient temperature Ti. Compare Ts-Ti with the preset temperature difference judgment threshold e. If Ts-Ti ≥ e, activate the gas replenishment and enthalpy increase function. S2.2: If To > a, compare the statistical time parameter ts with the preset time judgment threshold b. If ts ≥ b, determine whether the air conditioner needs to defrost. If the air conditioner does not need to defrost, determine the value of the gas replenishment and enthalpy increase start flag B. If B = 0, count the time t. S3: Set Ti2 as the second recorded parameter for indoor ambient temperature; Compare the statistical time parameter t with the preset time judgment threshold c. If t≥c, obtain the indoor ambient temperature Ti, let Ti2=Ti, calculate ΔTi=Ti2-Ti1, and calculate ΔT=Ts-Ti. S4: Let Rf be the indoor fan speed setting, and the indoor fan has three speed settings: low, medium, and high. The calculated ΔTi is compared with the preset temperature difference judgment threshold d. If △Ti≥d, ① Compare the calculated ΔT with the preset temperature difference judgment threshold f. If ΔT≥f, continue operating according to the current state. ②If △T < f, activate the enthalpy-increasing function; If △Ti < d Compare ΔT with the preset temperature difference threshold e. If ΔT ≥ e, obtain the compressor discharge temperature Td and Rf. Continue to compare the compressor discharge temperature Td with the preset temperature threshold h. If Td < h, set the gas injection enthalpy enhancement activation flag B = 2, obtain the current compressor input power P, and then activate the gas injection enthalpy enhancement. Adjust the opening degree P1 of the first throttling mechanism and the opening degree P2 of the second throttling mechanism to obtain the current compressor input power P'. Calculate α = P' / P. Compare the calculated α value with the preset parameters. If α meets the preset conditions, return to S1. If α does not meet the preset conditions, adjust the opening degrees of P1 and P2 until α meets the preset conditions.

2. The heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner according to claim 1, characterized in that: In S2.2, if the air conditioner needs to defrost, the air conditioner will start defrosting. The controller will determine whether the defrosting is complete. If the defrosting is complete, the air supply enthalpy control flag S=0. If the defrosting is not complete, the air conditioner will run in defrosting mode until it is complete.

3. The heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner according to claim 1, characterized in that: In S2.2, if ts < b, then return to S1 to continue counting ts and t; in S3, if t < c, then continue counting time t until t ≥ c.

4. The heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner according to claim 1, characterized in that: In S4, if △T < e, the air conditioner continues to operate according to its current state.

5. The heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner according to claim 1, characterized in that: In S4, if Td≥h, then return to S1.

6. A gas-injection enthalpy-increasing heat pump air conditioner, applied to the heating operation control method of the gas-injection enthalpy-increasing heat pump air conditioner described in any one of claims 1 to 5.

7. A gas-injection enthalpy-increasing heat pump air conditioner according to claim 6, characterized in that: The controller includes an indoor control mechanism (105) and an outdoor control mechanism (212) that are capable of communicating with each other and controlling the indoor unit (10) and the outdoor unit (20) respectively.

8. A gas-injection enthalpy-increasing heat pump air conditioner according to claim 7, characterized in that: The indoor control mechanism (105) includes a user information receiving module (1051), a first operation information acquisition module (1052), a first operation status judgment module (1053), a first operation status control module (1054), a first operation status information storage module (1055), a first time statistics module (1056), and a first information sending / receiving module (1057); wherein: The user information receiving module (1051) is adapted to receive the air conditioner operation status setting parameters set by the user. The first operation information acquisition module (1052) is adapted to acquire the operation status information of each component in the indoor unit (10); The first operating status judgment module (1053) is adapted to judge the operating status of the indoor unit (10). The first operating status control module (1054) is suitable for controlling the operating status of each component in the indoor unit (10). The first operating status information storage module (1055) is suitable for storing the operating status information of the indoor unit (10); The first time statistics module (1056) is suitable for statistics of the operating time of the indoor unit (10) in various operating modes and operating states. The first information sending / receiving module (1057) is adapted to communicate with the outdoor control mechanism (212).

9. The heating operation control method for a gas-injection enthalpy-increasing heat pump air conditioner according to claim 8, characterized in that: The outdoor control mechanism (212) includes a second operating status acquisition module (2121), a second operating status judgment module (2122), a second operating status control module (2123), a second operating status information storage module (2124), a second time statistics module (2125), and a second information sending / receiving module (2126); wherein, The second operating status acquisition module (2121) is adapted to acquire the operating status information of each component in the outdoor unit (20); The second operating status judgment module (2122) is suitable for judging the operating status of the outdoor unit (20); The second operating status control module (2123) is suitable for controlling the operating status of each component in the outdoor unit (20); The second operating status information storage module (2124) is suitable for storing the operating status information of the outdoor unit (20); The second time statistics module (2125) is suitable for calculating the operating time of the outdoor unit in various operating modes and operating states. The second information sending / receiving module (2126) is adapted to communicate with the indoor control mechanism (105).

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