Split type heat pump air conditioner and its reliable operation control method

Abstract

The present application relates to the technical field of air conditioning equipment, and more particularly to a split type heat pump air conditioner and a reliability operation control method thereof, which can calculate the refrigerant accumulation position after the air conditioner is powered on, and quantify the refrigerant accumulation position and the amount of accumulation, so that different start-up protection strategies can be taken according to the actual refrigerant accumulation condition when the air conditioner is started again, thereby avoiding the occurrence of problems such as compressor damage or affecting the reliability of compressor operation caused by a large amount of liquid refrigerant flowing back into the compressor or excessive accumulation of liquid refrigerant in the compressor after shutdown or power failure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to a split heat pump type air conditioner and a reliability operation control method thereof. BACKGROUND

[0002] Split air conditioners have been widely used in people's work and life. During the use of the air conditioner, the air conditioner is not continuously operated. During the process from the end of the refrigeration season to the beginning of the heating season or from the end of the heating season to the beginning of the refrigeration season, the air conditioner will be in a stopped operation state.

[0003] When the split air conditioner is in a stopped operation state for a long time, when the temperature difference between the positions of the indoor unit and the outdoor unit reaches a certain degree, the refrigerant in the air conditioner will migrate from the high-temperature part to the low-temperature part, and the liquid refrigerant will accumulate in the part with relatively low temperature. The existing air conditioner does not consider the influence of refrigerant migration on the operation reliability of the air conditioner. SUMMARY

[0004] In order to solve the above problems, the purpose of the present application is to provide a split heat pump type air conditioner and a reliability operation control method thereof, which can quantify the accumulation position and amount of refrigerant, so that different start-up protection strategies can be taken according to the actual accumulation of refrigerant when the air conditioner is started again, thereby avoiding the occurrence of problems such as the damage of the compressor or the influence on the operation reliability of the compressor caused by the large amount of liquid refrigerant flowing back into the compressor or the excessive accumulation of liquid refrigerant in the compressor after the air conditioner is stopped or powered off and then started again.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a reliability operation control method of a split heat pump type air conditioner, applied to a split heat pump type air conditioner, the split heat pump type air conditioner comprising a controller, an indoor unit and an outdoor unit; characterized in that:

[0006] The indoor unit comprises an indoor heat exchanger, an indoor environment temperature sensor, an indoor fan and an indoor control mechanism;

[0007] The outdoor unit comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, an outdoor environment temperature sensor, an outdoor fan, a throttling mechanism for controlling flow and an outdoor control mechanism; the indoor heat exchanger and the outdoor heat exchanger form a loop through a first refrigerant linking pipeline and a second refrigerant linking pipeline, the compressor and the throttling mechanism are arranged in the above-mentioned loop, the four-way reversing valve is used to switch valve ports so that the air conditioner has a refrigeration mode and a heating mode; the controller comprises the indoor control mechanism and the outdoor control mechanism; the control method comprises the following steps:

[0008] S1: the air conditioner is powered on, the controller records the power-on time ts, and judges whether the air conditioner receives the start-up signal set by the user; if yes, the start-up parameters set by the user are received, and the controller obtains the air conditioner start-up time tk;

[0009] whether the air conditioner has been powered off is judged, that is, whether D is equal to 1; if D = 1, the air conditioner has been powered off, the last shutdown or power-off time td is obtained, tk-td is calculated, the indoor environment temperature Ti and the outdoor environment temperature To are obtained, and the refrigerant accumulation condition statistical parameter ∑M is calculated; if D = 0, the air conditioner has not been powered off, the last shutdown or power-off time td is obtained, and the refrigerant accumulation condition statistical parameter ∑M is calculated;

[0010] S2: the controller judges whether ∑M is less than -80 or ∑M is greater than 80; if -80≤∑M≤80, the air conditioner operates according to the parameters set by the user, and D = 0;

[0011] the controller judges whether the air conditioner receives the shutdown signal; if no shutdown signal is received, whether the air conditioner has been powered off is judged again; if powered off, D = 1;

[0012] whether the current operation mode is a heating mode is judged again; if the current mode is a heating mode, a = 50;

[0013] if the current mode is not a heating mode, a = -50;

[0014] whether the air conditioner has been powered off is judged again; if D = 1, the current time td is recorded, and the program is ended; if D = 0, step S1 is returned to;

[0015] S3: if ∑M < -80, the air conditioner enters a compressor preheating operation mode; after the air conditioner operates in the compressor preheating operation mode for a period of time, the controller judges whether the compressor preheating operation mode is ended; if the compressor preheating operation mode is ended, the controller continues to judge whether the operation mode set by the user is a heating mode; if the set mode is a heating mode, the air conditioner performs temporary cooling operation;

[0016] after the air conditioner performs temporary cooling operation for a period of time, the controller judges whether the temporary cooling operation is completed; if the temporary cooling operation is completed, step S2 is returned to;

[0017] S4: if ∑M > 80, the controller judges whether the operation mode set by the user is a heating mode; if the set mode is a heating mode, step S2 is returned to; if the set mode is a non-heating mode, the controller performs temporary heating operation; after the temporary heating mode operates for a period of time, step S2 is returned to;

[0018] As preferred, in S1, if the controller does not receive the start signal set by the user, the controller acquires the indoor environment temperature Ti and the outdoor environment temperature To and judges whether the air conditioner is powered off, if the air conditioner is powered off, D=1, the current time td is recorded, and the program is ended; if the air conditioner is not powered off, the step S1 is returned.

[0019] As preferred, in S2, if the controller receives the stop signal, it is directly judged whether the current operation mode is the heating mode.

[0020] As preferred, the controller calculates the duration tk-td of the power-off of the air conditioner according to tk and td, and outputs the ∑M value according to the power-off duration:

[0021] When tk-td≥3 days, and Ti≥To, ∑M<-80;

[0022] When tk-td≥3 days, and TiTo, ∑M>80;

[0023] When tk-td<3 days, -80≤∑M≤80.

[0024] As preferred, the ∑M can also be calculated by formula 1, which is calculated according to Ti-To in each time period and the duration in the Ti-To temperature difference interval.

[0025] As preferred, the indoor control mechanism comprises:

[0026] A user information receiving module adapted to receive the air conditioner operation state setting information set by the user;

[0027] An operation information acquiring module adapted to acquire the operation information of each device in the indoor unit and the information received by the user information receiving module and capable of acquiring whether the air conditioner is in the powered-on state or the powered-off state;

[0028] A time acquiring / statistical module adapted to acquire the current date and time, to statistically acquire the duration of the standby non-operation state of the unit, and to statistically acquire the duration of the powered-off non-operation state of the unit;

[0029] An information sending / receiving module adapted to communicate with the outdoor unit control mechanism.

[0030] As preferred, the outdoor control mechanism comprises:

[0031] An operation information acquiring module adapted to acquire the operation information of each device in the outdoor unit;

[0032] An information sending / receiving module adapted to communicate information with the indoor unit control mechanism;

[0033] The application discloses a split heat pump type air conditioner and a reliability operation control method thereof.

[0034] The controller can directly calculate the refrigerant accumulation condition statistical parameter ΣM and determine whether the refrigerant accumulates in the outdoor unit or the indoor unit according to the power-off duration of the air conditioner.

[0035] The indoor environment temperature and the outdoor environment temperature are calculated according to the environment temperature at the positions of the outdoor unit and the indoor unit, the duration of the air conditioner indoor unit and the outdoor unit under each temperature difference condition is recorded, the statistical time corresponding to different statistical weighting coefficients of the environment temperature difference at the positions of the air conditioner indoor unit and the outdoor unit under each temperature difference condition is obtained, and then the refrigerant accumulation condition statistical parameter ΣM is calculated to determine whether the refrigerant accumulates in the outdoor unit or the indoor unit.

[0036] 1) When most of the refrigerant accumulates in the outdoor unit, the compressor preheating mode is started.

[0037] After the compressor preheating mode is completed, if the set operation mode is heating, the temporary refrigeration operation mode is started.

[0038] After the temporary refrigeration operation mode is completed, the air conditioner is operated according to the set operation mode of the user.

[0039] After the compressor preheating mode is completed, if the set operation mode is non-heating mode, the air conditioner is operated according to the set operation mode of the user.

[0040] 2) When most of the refrigerant accumulates in the indoor unit, if the set operation mode of the user is heating, the air conditioner is directly operated according to the set mode.

[0041] When most of the refrigerant accumulates in the indoor unit, if the set operation mode of the user is non-heating mode, the temporary heating operation mode is started.

[0042] After the temporary heating operation mode is completed, the air conditioner is operated according to the set operation mode of the user.

[0043] When the air conditioner is turned off or powered off, the refrigerant accumulation condition statistical parameter initial parameter is output according to the current operation mode.

[0044] By reasonably controlling the above scheme, the accumulation position and accumulation amount of the refrigerant can be quantified, so that when the air conditioner is started again, different start protection strategies can be taken according to the actual accumulation of the refrigerant, to avoid the problem of compressor damage or affecting the operation reliability of the compressor caused by a large amount of liquid refrigerant flowing back into the compressor or the accumulation of too much liquid refrigerant in the compressor when starting again after shutdown or power failure. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of a split type heat pump air conditioner.

[0046] Figure 2 It is a structural schematic diagram of an indoor control mechanism and an outdoor control mechanism.

[0047] Figure 3 It is a control logic schematic diagram of the split type heat pump air conditioner in the present application.

[0048] Figure 4 It is a table schematic diagram of the first case of ∑M calculation mode value.

[0049] Figure 5 It is a table schematic diagram of the second case of ∑M calculation mode value. DETAILED DESCRIPTION

[0050] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0051] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0053] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connecting", "fixed", and the like should be construed as broadly as possible, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0055] As shown in a split heat pump type air conditioner 1, comprising a controller, an indoor unit 10 and an outdoor unit 20; Figures 1-2

[0056] The indoor unit 10 comprises an indoor heat exchanger 101, an indoor ambient temperature sensor 102, an indoor fan 103 and an indoor control mechanism 104;

[0057] The outdoor unit 20 comprises a compressor 201, a four-way reversing valve 202, an outdoor heat exchanger 203, an outdoor ambient temperature sensor 204, an outdoor fan 205, a throttling mechanism 206 for controlling flow and an outdoor control mechanism 207; the indoor heat exchanger 101 and the outdoor heat exchanger 203 form a circuit through a first refrigerant linking pipe 30 and a second refrigerant linking pipe 40, the compressor 201 and the throttling mechanism 206 are arranged in the above-mentioned circuit, the four-way reversing valve 202 is used to switch valve ports so that the air conditioner has a cooling mode and a heating mode; the controller comprises the indoor control mechanism 104 and the outdoor control mechanism 207.

[0058] Further, the indoor control mechanism 104 comprises:

[0059] a user information receiving module 1041 adapted to receive air conditioner operating state setting information set by a user;

[0060] ​The operation information acquisition module 1042 is adapted to acquire the operation information of each component in the indoor unit 10 and the information received by the user information receiving module 1041, and can acquire whether the air conditioner is in a power-on state or a power-off state.

[0061] The time acquisition / statistics module 1043 is suitable for acquiring the current date and time, calculating the duration of the unit in standby and non-operational state, and calculating the duration of the unit in power-off and non-operational state.

[0062] The information sending / receiving module 1044 is suitable for communicating with the outdoor unit control mechanism 207.

[0063] Furthermore, the outdoor control mechanism 207 includes:

[0064] The operation information acquisition module 2071 is suitable for acquiring the operation information of each component in the outdoor unit 20;

[0065] Information sending / receiving module 2072 is suitable for exchanging information with indoor unit control mechanism 104;

[0066] like Figure 3 The following is a reliable operation control method for a split-type heat pump air conditioner:

[0067] S1: When the air conditioner is powered on, the controller records the power-on time ts and determines whether the air conditioner has received the power-on signal set by the user; if so, the controller receives the power-on parameters set by the user and obtains the power-on time tk of the air conditioner.

[0068] To determine whether the air conditioner has experienced a power outage, check if D equals 1. If D = 1, the air conditioner has experienced a power outage. Then, obtain the last shutdown or power outage time td, calculate tk-td, and obtain the indoor ambient temperature Ti and outdoor ambient temperature To. Calculate the statistical parameter ∑M for refrigerant accumulation. If D = 0, the air conditioner has not experienced a power outage. Then, obtain the last shutdown or power outage time td and calculate the statistical parameter ∑M for refrigerant accumulation.

[0069] S2: The controller determines whether ∑M is less than -80 or greater than 80. If -80≤∑M≤80, the air conditioner operates according to the parameters set by the user, and D=0.

[0070] The controller determines whether the air conditioner has received a shutdown signal. If no shutdown signal is received, it then determines whether the air conditioner has experienced a power outage. If a power outage has occurred, it sets D=1.

[0071] Continue to determine whether the current operating mode is heating mode. If the current mode is heating mode, set a = 50.

[0072] If the current mode is not heating mode, let a = -50;

[0073] If D=1, the current time td is recorded, and the program is ended; if D=0, the step S1 is returned to.

[0074] S3: If ∑M<-80, the air conditioner enters the compressor preheating operation mode; after the air conditioner operates in the compressor preheating operation mode for a period of time, the controller judges whether the compressor preheating operation mode is ended, if the compressor preheating operation mode is ended, the controller continues to judge whether the operation mode set by the user is the heating mode, if the set mode is the heating mode, the air conditioner executes the temporary cooling operation;

[0075] After the air conditioner operates in the temporary cooling operation mode for a period of time, the controller judges whether the temporary cooling operation is completed, if the temporary cooling operation is completed, the step S2 is returned to;

[0076] S4: If ∑M>80, the controller judges whether the operation mode set by the user is the heating mode, if the set mode is the heating mode, the step S2 is returned to; if the set mode is the non-heating mode, the controller executes the temporary heating operation; after the air conditioner operates in the temporary heating operation mode for a period of time, the step S2 is returned to;

[0077] Further, in S1, if the controller does not receive the start signal set by the user, the controller obtains the indoor environment temperature Ti and the outdoor environment temperature To and judges whether the air conditioner is powered off, if the air conditioner is powered off, D=1 is set, the current time td is recorded, and the program is ended; if the air conditioner is not powered off, the step S1 is returned to.

[0078] Further, in the step S2, if the controller receives the shutdown signal, it is directly judged whether the current operation mode is the heating mode.

[0079] Further, the controller calculates the duration tk-td of the power-off of the air conditioner according to tk and td, and outputs the ∑M value according to the power-off duration:

[0080] When tk-td≥3 days, and Ti≥To, ∑M<-80;

[0081] When tk-td≥3 days, and Ti<To, ∑M>80;

[0082] When tk-td<3 days, -80≤∑M≤80.

[0083] Further, the ∑M can also be calculated by the formula 1, which is calculated according to Ti-To in each time period and the duration in the Ti-To temperature difference interval.

[0084] In this embodiment, asFigure 3 The specific steps of the reliability operation control method of the split heat pump type air conditioner are as follows: step S0: the user manually powers on the air conditioner, and then enters step S1;

[0085] Step S1: start the program, and then enter step S2;

[0086] Step S2: record the power-on time ts of the air conditioner, and then enter step S3;

[0087] Step S3: determine whether the air conditioner receives the start signal set by the user, if the air conditioner receives the start signal, enter step S4, otherwise enter step S29;

[0088] Step S4: receive the start parameters set by the user, and obtain the current time tk at the start time, and then enter step S5;

[0089] Step S5: determine whether the value of D is equal to 1, if D=1, enter step S8, otherwise enter step S6;

[0090] Step S6: obtain the last shutdown or power-off time td, and then enter step S7;

[0091] Step S7: calculate the refrigerant accumulation condition statistical parameter ∑M, and then enter step S11;

[0092] Step S8: obtain the last shutdown or power-off time td, and then enter step S9;

[0093] Step S9: obtain Ti and To, calculate tk-td, and then enter step S10;

[0094] Step S10: calculate the refrigerant accumulation condition statistical parameter ∑M, and then enter step S11;

[0095] Step S11: determine whether ∑M is less than -80 or ∑M is greater than 80, if ∑M<-80 or ∑M>80, enter step S20, otherwise enter step S12;

[0096] Step S12: the air conditioner operates according to the parameters set by the user, and D=0, and then enter step S13;

[0097] Step S13: determine whether the air conditioner receives the shutdown signal, if the shutdown signal is received, enter step S16, otherwise enter step S14;

[0098] Step S14: determine whether the air conditioner is powered off, if the air conditioner is powered off, enter step S15, otherwise enter step S12;

[0099] Step S15: Let D = 1, then go to step S16;

[0100] Step S16: Judge whether the current operation mode is heating mode, if yes, go to step S17, otherwise go to step S18;

[0101] Step S17: Let a = 50, then go to step S19;

[0102] Step S18: Let a = -50, then go to step S19;

[0103] Step S19: Judge whether the value of D is equal to 1, if yes, go to step S32, otherwise go to step S3;

[0104] Step S20: Judge whether ∑M is less than -80, if yes, go to step S21, otherwise go to step S26;

[0105] Step S21: Go to compressor preheating operation mode, then go to step S22;

[0106] Step S22: Judge whether the compressor preheating operation mode is over (e.g. the preheating mode is set to 5 minutes), if yes, go to step S23, otherwise go to step S21;

[0107] Step S23: Judge whether the operation mode set by the user is heating mode, if yes, go to step S24, otherwise go to step S12;

[0108] Step S24: The air conditioner executes temporary cooling operation, then go to step S25;

[0109] Step S25: Judge whether the temporary cooling operation is over (e.g. the temporary cooling mode is set to 2 minutes), if yes, go to step S12, otherwise go to step S24;

[0110] Step S26: Judge whether the operation mode set by the user is heating mode, if yes, go to step S12, otherwise go to step S27;

[0111] Step S27: The air conditioner executes temporary heating operation, then go to step S28;

[0112] Step S28: Judge whether the temporary heating operation is over (e.g. the temporary heating mode is set to 2 minutes), if yes, go to step S12, otherwise go to step S27;

[0113] Step S29: Record Ti, To, then go to step S30;

[0114] Step S30: Determine whether the air conditioner has lost power. If the air conditioner has lost power, proceed to step S31; otherwise, proceed to step S3.

[0115] Step S31: Set D = 1, then proceed to step S32;

[0116] Step S32: Record the current time td, and then proceed to step S33;

[0117] Step S33: End the program;

[0118] like Figure 4 As shown, in step S29, the controller involved in this invention is able to record the duration of Ti and To at each temperature while recording the indoor ambient temperature Ti and the outdoor ambient temperature To.

[0119] like Figure 4 As shown, in step S7, the control mechanism involved in this invention can calculate Ti-To at each time based on the data recorded in step S29, and statistically calculate the duration (t) corresponding to Ti-To in each temperature difference range (<-15, [-15,-12), [-12,-9), [-9,-6), [-6,-3), [-3,3], (3,6], (6,9], (9,12], (12,15], >15). -15 t (-15，-12) t (-12，-9) t (-9，-6) t (-6，-3) t (-3，3) t (3，6) t (6，9) t (9，12) t (12，15) t (15) ), ∑M is calculated according to formula 1:

[0120] ∑M=a+t×α=a+t -15 ×0.5+t (-15，-12) ×0.4+t (-12，-9) ×0.3+t (-9，-6) ×0.2+t (-6，-3) ×0.1+t (3，6) ×(-0.2)+t (6，9) ×(-0.4)+t (9，12) ×(-0.6)+t (12，15) ×(-0.8)+t (15) ×(-1)(Formula 1).

[0121] As stated in Equation 1, since the refrigerant migration will eventually reach an equilibrium state, there are maximum and minimum value limits for ∑M in Equation 1 (e.g., the maximum value limit for ∑M is 120, and the minimum value limit is -120). When the calculation result in Equation 1 exceeds the maximum or minimum value range, the output result of ∑M is the maximum or minimum value.

[0122] like Figure 5 As shown, in step S10, the control mechanism involved in this invention can calculate the power outage duration tk-td of the air conditioner based on tk and td, and output the value ∑M based on the power outage duration:

[0123] When tk-td≥3 days and Ti≥To, ∑M<-80;

[0124] When tk-td≥3 days and Ti<To, ∑M>80;

[0125] When tk-td < 3 days, -80 ≤ ∑M ≤ 80.

[0126] Symbol explanation:

[0127] Ti: Indoor ambient temperature, °C;

[0128] To: Outdoor ambient temperature, °C;

[0129] ts: The time the air conditioner was powered on. The ts data is recorded to the minute (e.g., 16:10 on January 1, 2023).

[0130] td: The time point at which the air conditioner is turned off or the power is cut off;

[0131] tk: The time point at which the air conditioner is turned on;

[0132] D: A marker indicating a power outage has occurred. D=1 indicates a power outage has occurred, and D=0 indicates no power outage has occurred.

[0133] a: Initial parameters for statistical parameters of refrigerant accumulation when the unit is stopped or shut down;

[0134] α: Weighting coefficient for statistical duration;

[0135] ∑M: A statistical parameter for refrigerant accumulation. A positive ∑M result indicates that a large amount of refrigerant has accumulated in the indoor unit, while a negative ∑M result indicates that a large amount of refrigerant has accumulated in the outdoor unit.

[0136] In this specific embodiment, the control effect can be obtained through the above control logic:

[0137] 1) When most of the refrigerant accumulates in the outdoor unit, the compressor preheating mode is activated.

[0138] After the compressor preheating mode operation is completed, if the set operation mode is heating, the temporary refrigeration operation mode is started.

[0139] After the temporary refrigeration operation mode operation is completed, the operation mode set by the user is performed.

[0140] After the compressor preheating mode operation is completed, if the set operation mode is non-heating mode, the operation mode set by the user is performed.

[0141] 2) When most refrigerant accumulates in the indoor unit, if the operation mode set by the user is heating, the air conditioner directly operates according to the set mode.

[0142] When most refrigerant accumulates in the indoor unit, if the operation mode set by the user is non-heating mode, the temporary heating operation mode is started.

[0143] After the temporary heating operation mode is completed, the operation mode set by the user is performed.

[0144] When the air conditioner is powered off or loses power, the refrigerant accumulation condition statistical parameter initial parameter is output according to the current operation mode. It should be noted that the refrigerant accumulation statistical parameter is superimposed on the statistical initial parameter.

[0145] The above control effect achieves the following purposes:

[0146] The refrigerant accumulation position and the amount of accumulation are quantified, so that when the air conditioner is started again, different start protection strategies can be taken according to the actual refrigerant accumulation condition, avoiding the occurrence of problems such as the large amount of liquid refrigerant flowing back into the compressor or the excessive accumulation of liquid refrigerant in the compressor, which can cause damage to the compressor or affect the reliability of the compressor operation.

[0147] It should be noted that the reliability operation control method is also applicable to single-cooling type air conditioners.

[0148] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0149] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the spirit and scope of the present application.

Claims

1. A reliable operation control method of a split heat pump type air conditioner, applied to a split heat pump type air conditioner (1), the split heat pump type air conditioner (1) comprising a controller, an indoor unit (10) and an outdoor unit (20); characterized in that: the indoor unit (10) comprises an indoor heat exchanger (101), an indoor ambient temperature sensor (102), an indoor fan (103) and an indoor control mechanism (104); the outdoor unit (20) comprises a compressor (201), a four-way reversing valve (202), an outdoor heat exchanger (203), an outdoor ambient temperature sensor (204), an outdoor fan (205), a throttling mechanism (206) for controlling flow and an outdoor control mechanism (207); the indoor heat exchanger (101) and the outdoor heat exchanger (203) form a circuit through a first refrigerant linking pipeline (30) and a second refrigerant linking pipeline (40), the compressor (201) and the throttling mechanism (206) are arranged in the circuit, and the four-way reversing valve (202) is used to switch valve ports so that the air conditioner has a cooling mode and a heating mode; the controller comprises the indoor control mechanism (104) and the outdoor control mechanism (207); and the control method comprises the following steps: S1: the air conditioner is powered on, the controller records the power-on time ts, and judges whether the air conditioner receives a start signal set by a user; if yes, the start parameters set by the user are received, and the controller obtains the start time tk of the air conditioner; D is a mark indicating whether a power failure has occurred, D=1 indicates that a power failure has occurred, and D=0 indicates that a power failure has not occurred; whether the air conditioner has experienced a power failure is judged, i.e. whether D is equal to 1, if D=1, the air conditioner has experienced a power failure, the last shutdown or power failure time td is obtained, the indoor ambient temperature Ti and the outdoor ambient temperature To are obtained, and the refrigerant accumulation condition statistical parameter ∑M is calculated; if D=0, the air conditioner has not experienced a power failure, the last shutdown or power failure time td is obtained, and the refrigerant accumulation condition statistical parameter ∑M is calculated; i.e. the controller calculates the duration of the power failure of the air conditioner according to tk and td, and outputs the ∑M value according to the duration of the power failure: when tk-td≥3 days, and Ti≥To, ∑M<-80; when tk-td≥3 days, and Ti<To, ∑M>80; when tk-td<3 days, -80≤∑M≤80; S2: the controller judges whether ∑M is less than -80 or ∑M is greater than 80, if -80≤∑M≤80, the air conditioner operates according to the parameters set by the user, and D=0; the controller judges whether the air conditioner receives a shutdown signal, if no shutdown signal is received, whether the air conditioner has experienced a power failure is judged again, if a power failure has occurred, D=1; a is the initial parameter of the refrigerant accumulation condition statistical parameter when the machine is stopped or shut down; whether the current operation mode is a heating mode is judged again, if the current mode is a heating mode, a=50; if the current mode is not a heating mode, a=-50; If D=1, the current time td is recorded, and the program is ended; if D=0, the step S1 is returned; S3: If ∑M<-80, the air conditioner enters the compressor preheating operation mode; After the air conditioner operates in the compressor preheating operation mode for a period of time, the controller judges whether the compressor preheating operation mode is ended, if the compressor preheating operation mode is ended, the controller continues to judge whether the operation mode set by the user is the heating mode, if the set mode is the heating mode, the air conditioner executes the temporary cooling operation; After the air conditioner operates in the temporary cooling operation for a period of time, the controller judges whether the temporary cooling operation is completed, if the temporary cooling operation is completed, the step S2 is returned; S4: If ∑M>80, the controller judges whether the operation mode set by the user is the heating mode, if the set mode is the heating mode, the step S2 is returned; if the set mode is the non-heating mode, the controller executes the temporary heating operation; after the temporary heating operation mode operates for a period of time, the step S2 is returned.

2. The reliability operation control method of the split heat pump type air conditioner according to claim 1, characterized by: In S1, if the controller does not receive the start signal set by the user, the controller obtains the indoor environment temperature Ti and the outdoor environment temperature To and judges whether the air conditioner is powered off, if the air conditioner is powered off, D=1 is set, the current time td is recorded, and the program is ended; if the air conditioner is not powered off, the step S1 is returned.

3. The reliability operation control method of the split heat pump type air conditioner according to claim 1, characterized by: In step S2, if the controller receives the shutdown signal, it directly enters the judgment of whether the current operation mode is the heating mode.

4. The reliability operation control method of the split heat pump type air conditioner according to claim 1, characterized in that: The indoor control mechanism (104) comprises: A user information receiving module (1041) adapted to receive the air conditioner operation state setting information set by the user; A first operation information obtaining module (1042) adapted to obtain the operation information of each device in the indoor unit (10) and the information received by the user information receiving module (1041) and capable of obtaining whether the air conditioner is in a powered-on state or a powered-off state; A time obtaining / statistical module (1043) adapted to obtain the current date and time, count the length of time when the unit is in standby and non-operation state, and count the length of time when the unit is in powered-off and non-operation state; A first information sending / receiving module (1044) adapted to communicate with the outdoor control mechanism (207).

5. The reliability operation control method of the split heat pump type air conditioner according to claim 4, characterized in that: The outdoor control mechanism (207) comprises: A second operation information obtaining module (2071) adapted to obtain the operation information of each device in the outdoor unit (20); A second information sending / receiving module (2072) adapted to communicate information with the indoor control mechanism (104).

6. A split-type heat pump air conditioner, characterized by: A reliability operation control method of a split heat pump type air conditioner according to any one of claims 1-5.

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