CN113446704A - Air conditioner, air leakage detection method of four-way valve and storage medium - Google Patents
Air conditioner, air leakage detection method of four-way valve and storage medium Download PDFInfo
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- CN113446704A CN113446704A CN202010221312.0A CN202010221312A CN113446704A CN 113446704 A CN113446704 A CN 113446704A CN 202010221312 A CN202010221312 A CN 202010221312A CN 113446704 A CN113446704 A CN 113446704A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses an air conditioner, a method for detecting the air leakage of a four-way valve and a storage medium, wherein the method for detecting the air leakage of the four-way valve comprises the steps of acquiring the condensing pressure and the evaporating pressure of the air conditioner when a reversing instruction of the four-way valve is detected, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure; when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner; and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage. Need not to change the hardware structure of cross valve, also need not to increase detection device in the air conditioner, can detect whether the cross valve takes place to crowd to in time stop the operation of air conditioner, prevent to harm the compressor, promoted the working property of compressor, prolonged the life of air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner, a method for detecting air leakage of a four-way valve and a computer readable storage medium.
Background
Along with the improvement of the living standard of people, the air conditioner also gradually becomes a necessary household appliance in the life of people. The four-way valve is an indispensable important component in the air conditioner, and has the function of realizing interconversion between refrigeration and heating by changing the flow direction of the refrigerant in a system pipeline, and the four-way valve can normally work under certain pressure. The cross-valve gas leakage is the phenomenon that the compressed high-temperature and high-pressure gas flows back to the compressor or the low-pressure end in the cross-valve in series from the low-pressure pipe. The four-way valve mainly comprises the following three parts: pilot valve, main valve and solenoid valve coil. The basic condition for the four-way valve to reverse is that the pressure differential across the piston must be greater than the frictional resistance, otherwise the four-way valve will not reverse. When the pressure difference between the left piston and the right piston of the four-way valve is larger than the frictional resistance, the four-way valve starts to change direction. When the unit has cross gas of the four-way valve, the refrigeration and heating effects of temperature adjusting equipment such as an air conditioner are obviously reduced, the high pressure and the exhaust temperature after compression are higher than the original normal values, and the performance of the compressor is seriously influenced.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, a method for detecting air leakage of a four-way valve and a computer readable storage medium, and aims to solve the technical problem that the working performance of a compressor is damaged due to the fact that the four-way valve is in an air leakage state for a long time.
In order to achieve the above object, the invention provides a method for detecting the cross gas of a four-way valve, which comprises the following steps:
when a reversing instruction of the four-way valve is detected, acquiring the condensing pressure and the evaporating pressure of an air conditioner, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure;
when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner;
and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage.
In an embodiment, the step of acquiring a condensing pressure and an evaporating pressure of an air conditioner when a reversing instruction of a four-way valve is detected, and calculating a current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure specifically includes:
when a reversing instruction of a four-way valve is detected, acquiring the current condensing temperature and the current evaporating temperature of the air conditioner;
converting the current condensing temperature into corresponding condensing pressure and converting the current evaporating temperature into corresponding evaporating pressure according to a preset corresponding relation table;
and calculating the pressure difference value of the evaporation pressure and the condensation pressure as the current pressure difference of the four-way valve.
In an embodiment, the step of acquiring the current condensing temperature and the current evaporating temperature of the air conditioner when the reversing instruction of the four-way valve is detected specifically includes:
when a reversing instruction of the four-way valve is detected, acquiring the initial condensing temperature of the air conditioner through a condenser temperature sensing bulb of the air conditioner, and acquiring the initial evaporating temperature of the air conditioner through an evaporator temperature sensing bulb;
determining a target condensation correction value and a target evaporation correction value corresponding to the air conditioner according to the air conditioner identifier;
and calculating the current condensation temperature of the air conditioner according to the initial condensation temperature and the target condensation correction value, and calculating the current evaporation temperature of the air conditioner according to the initial evaporation temperature and the target evaporation correction value.
In an embodiment, before the step of acquiring a condensing pressure and an evaporating pressure of an air conditioner when a reversing instruction of a four-way valve is detected, and calculating a current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure, the method further includes:
when the current operation mode of the air conditioner is a refrigeration mode, acquiring the current outdoor temperature, and judging whether the current outdoor temperature is not greater than a first temperature threshold value;
when the current outdoor temperature is not greater than the first temperature threshold, acquiring the air suction temperature of the air conditioner, and calculating a first temperature difference value between the air suction temperature and the current outdoor temperature;
and when the first temperature difference is greater than a first difference threshold value, acquiring the current condensation temperature of the air conditioner, and when the air suction temperature is greater than the current condensation temperature, judging that the four-way valve generates air mixing.
In an embodiment, the method for detecting the cross gas of the four-way valve further includes:
when the reversing flag bit of the four-way valve is detected to be 1, the duration time that the reversing flag bit of the four-way valve is 1 is obtained, and when the duration time reaches a preset time threshold value, the four-way valve is judged to be successfully reversed.
In an embodiment, before the step of obtaining a duration time that a commutation flag bit of the four-way valve is 1 when it is detected that the commutation flag bit of the four-way valve is 1, and determining that the four-way valve successfully commutates when the duration time reaches a preset time threshold, the method further includes:
acquiring a current operation mode of the air conditioner, and judging whether an E pipe and an S pipe of the four-way valve are communicated or not by the position of an internal sliding block of the four-way valve when the current operation mode is a refrigeration mode, a defrosting mode or an oil return mode;
and if the position of an internal sliding block of the four-way valve enables an E pipe and an S pipe of the four-way valve to be communicated, setting a reversing mark position of the four-way valve to be 1.
In one embodiment, after the step of obtaining the current operation mode of the air conditioner and determining whether the position of the inner slider of the four-way valve communicates the E-tube and the S-tube of the four-way valve when the current operation mode is the cooling mode, the defrosting mode, or the oil return mode, the method further includes:
if the position of an internal sliding block of the four-way valve does not enable an E pipe and an S pipe of the four-way valve to be communicated, judging that the four-way valve has air leakage, controlling the air conditioner to stop, and setting a reversing flag bit of the four-way valve to be 0;
and after a preset time interval, restarting the air conditioner, and locking the air conditioner in a fault when detecting that the frequency of the cross-gas of the four-way valve in a preset time period of the air conditioner reaches a preset frequency threshold value.
In an embodiment, the temperature parameter of the four-way valve for air leakage includes a second temperature threshold and a second difference threshold, and the step of determining whether the four-way valve is in air leakage according to the pre-stored temperature parameter of the four-way valve for air leakage, the pre-stored exhaust temperature and the pre-stored suction temperature, and controlling the air conditioner to stop operating when the four-way valve is in air leakage specifically includes:
judging whether the exhaust temperature is not greater than the second temperature threshold value;
if the exhaust temperature is not greater than the second temperature threshold, judging whether a second temperature difference value between the exhaust temperature and the suction temperature is not greater than a second difference threshold;
and if the second temperature difference value is not greater than the second difference value threshold value, determining that the four-way valve has air leakage, and controlling the air conditioner to stop running.
In order to achieve the above object, the present invention further provides an air conditioner, which includes a memory, a processor, and a refrigeration control program of the air conditioner stored in the memory and operable on the processor, wherein the refrigeration control program of the air conditioner, when executed by the processor, implements the steps of the method for detecting cross air of the four-way valve as described above.
In order to achieve the above object, the present invention further provides a computer-readable storage medium, which includes a refrigeration control program of an air conditioner, and the refrigeration control program of the air conditioner, when executed by a processor, implements the steps of the method for detecting cross air of a four-way valve as described above.
According to the air conditioner, the air leakage detection method of the four-way valve and the computer readable storage medium, when the reversing instruction of the four-way valve is detected, the condensation pressure and the evaporation pressure of the air conditioner are obtained, and the current pressure difference of the four-way valve is calculated according to the condensation pressure and the evaporation pressure; when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner; and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage. Through the mode, the current pressure difference of the condensing pressure and the evaporating pressure is compared, when the current pressure difference is smaller than the preset pressure threshold value, namely the current pressure difference of the four-way valve is smaller than the friction resistance, whether the exhaust temperature and the suction temperature are the same as the temperature parameters in the air mixing state is further judged, whether the air mixing happens to the four-way valve is determined, the hardware structure of the four-way valve is not required to be changed, and whether the air mixing happens to the four-way valve can be detected without adding a detection device in the air conditioner, so that the running of the air conditioner is stopped timely, the compressor is prevented from being damaged, the working performance of the compressor is improved, the service life of the air conditioner is prolonged, and the technical problem that the working performance of the compressor is damaged due to the fact that the four-way valve is in the air mixing state for a long time is solved.
Drawings
FIG. 1 is a schematic diagram of a hardware structure of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a first embodiment of a cross gas detection method of a four-way valve according to the present invention;
FIG. 3 is a system diagram of the heating mode of the air conditioner according to the present invention;
FIG. 4 is a schematic flow chart of a second embodiment of a cross-gas detection method of a four-way valve according to the present invention;
fig. 5 is a schematic flow chart of a third embodiment of a cross gas detection method of a four-way valve according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main solution of the embodiment of the invention is as follows: when a reversing instruction of the four-way valve is detected, acquiring the condensing pressure and the evaporating pressure of an air conditioner, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure; when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner; and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage. Through the mode, the current pressure difference of the condensing pressure and the evaporating pressure is compared, when the current pressure difference is smaller than the preset pressure threshold value, namely the current pressure difference of the four-way valve is smaller than the friction resistance, whether the exhaust temperature and the suction temperature are the same as the temperature parameters in the air mixing state is further judged, whether the air mixing happens to the four-way valve is determined, the hardware structure of the four-way valve is not required to be changed, and whether the air mixing happens to the four-way valve can be detected without adding a detection device in the air conditioner, so that the running of the air conditioner is stopped timely, the compressor is prevented from being damaged, the working performance of the compressor is improved, the service life of the air conditioner is prolonged, and the technical problem that the working performance of the compressor is damaged due to the fact that the four-way valve is in the air mixing state for a long time is solved.
As one implementation, the air conditioner may be as shown in fig. 1.
The embodiment of the invention relates to an air conditioner, which comprises: a processor 1001 (e.g., a CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components.
The memory 1005 may be a high-speed RAM memory or a non-volatile memory (e.g., a magnetic disk memory). As shown in fig. 1, a cooling control program of an air conditioner may be included in a memory 1005, which is a kind of computer storage medium; and the processor 1001 may be configured to call a cooling control program of the air conditioner stored in the memory 1005, and perform the following operations:
when a reversing instruction of the four-way valve is detected, acquiring the condensing pressure and the evaporating pressure of an air conditioner, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure;
when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner;
and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
when a reversing instruction of a four-way valve is detected, acquiring the current condensing temperature and the current evaporating temperature of the air conditioner;
converting the current condensing temperature into corresponding condensing pressure and converting the current evaporating temperature into corresponding evaporating pressure according to a preset corresponding relation table;
and calculating the pressure difference value of the evaporation pressure and the condensation pressure as the current pressure difference of the four-way valve.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
when a reversing instruction of the four-way valve is detected, acquiring the initial condensing temperature of the air conditioner through a condenser temperature sensing bulb of the air conditioner, and acquiring the initial evaporating temperature of the air conditioner through an evaporator temperature sensing bulb;
determining a target condensation correction value and a target evaporation correction value corresponding to the air conditioner according to the air conditioner identifier;
and calculating the current condensation temperature of the air conditioner according to the initial condensation temperature and the target condensation correction value, and calculating the current evaporation temperature of the air conditioner according to the initial evaporation temperature and the target evaporation correction value.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
when the current operation mode of the air conditioner is a refrigeration mode, acquiring the current outdoor temperature, and judging whether the current outdoor temperature is not greater than a first temperature threshold value;
when the current outdoor temperature is not greater than the first temperature threshold, acquiring the air suction temperature of the air conditioner, and calculating a first temperature difference value between the air suction temperature and the current outdoor temperature;
and when the first temperature difference is greater than a first difference threshold value, acquiring the current condensation temperature of the air conditioner, and when the air suction temperature is greater than the current condensation temperature, judging that the four-way valve generates air mixing.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
when the reversing flag bit of the four-way valve is detected to be 1, the duration time that the reversing flag bit of the four-way valve is 1 is obtained, and when the duration time reaches a preset time threshold value, the four-way valve is judged to be successfully reversed.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
acquiring a current operation mode of the air conditioner, and judging whether an E pipe and an S pipe of the four-way valve are communicated or not by the position of an internal sliding block of the four-way valve when the current operation mode is a refrigeration mode, a defrosting mode or an oil return mode;
and if the position of an internal sliding block of the four-way valve enables an E pipe and an S pipe of the four-way valve to be communicated, setting a reversing mark position of the four-way valve to be 1. If the position of an internal sliding block of the four-way valve does not enable an E pipe and an S pipe of the four-way valve to be communicated, judging that the four-way valve has air leakage, controlling the air conditioner to stop, and setting a reversing flag bit of the four-way valve to be 0;
and after a preset time interval, restarting the air conditioner, and locking the air conditioner in a fault when detecting that the frequency of the cross-gas of the four-way valve in a preset time period of the air conditioner reaches a preset frequency threshold value.
In one embodiment, the processor 1001 may be configured to call a cooling control program of an air conditioner stored in the memory 1005, and perform the following operations:
judging whether the exhaust temperature is not greater than the second temperature threshold value;
if the exhaust temperature is not greater than the second temperature threshold, judging whether a second temperature difference value between the exhaust temperature and the suction temperature is not greater than a second difference threshold;
and if the second temperature difference value is not greater than the second difference value threshold value, determining that the four-way valve has air leakage, and controlling the air conditioner to stop running.
Based on the hardware architecture, the embodiment of the air leakage detection method of the four-way valve is provided.
Referring to fig. 2, fig. 2 is a first embodiment of a method for detecting cross gas of a four-way valve according to the present invention, and the method for detecting cross gas of a four-way valve includes the following steps:
step S10, when a reversing instruction of the four-way valve is detected, acquiring the condensing pressure and the evaporating pressure of the air conditioner, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure;
at present, when the air conditioner unit has cross air flow of the four-way valve, the refrigeration and heating effects of temperature adjusting equipment such as an air conditioner are obviously reduced, the high pressure and the exhaust temperature after compression are higher than the original normal values, and the performance of the compressor is seriously influenced. At present, in order to solve the problem that the working performance of a compressor is damaged because a four-way valve is in a gas leakage state for a long time, the structure of the four-way valve needs to be changed, so that the manufacturing cost of a valve body is increased, and the application rate of the four-way valve is reduced; or a pressure detection device or a temperature sensing detection device needs to be additionally arranged on the four-way valve, so that the manufacturing cost of the air conditioner is increased. And this application is in the problem that the gas mixing state damages compressor operating performance for a long time in order to solve the cross valve, through the current pressure difference of comparison condensing pressure and evaporating pressure, and when current pressure difference is less than preset pressure threshold value, the current pressure difference of cross valve is less than frictional resistance promptly, further judge exhaust temperature and inspiration temperature and the temperature parameter under the gas mixing state is the same, thereby confirm whether the cross valve takes place the gas mixing, need not to change the hardware structure of cross valve, also need not to increase detection device in the air conditioner, can detect whether the cross valve takes place the gas mixing. Specifically, as shown in fig. 3, the conventional air conditioner is generally provided with an exhaust bulb, an intake bulb, an outdoor environment bulb, an indoor environment bulb, and the like, and each bulb is used to detect a corresponding position temperature as shown in the following table.
| Parameter code | Parameter(s) |
| T2 | Evaporator temperature sensing bulb |
| T3 | Condenser outlet temperature sensing bulb |
| T3b | Middle temperature sensing bag of condenser coil |
| T4 | Outdoor environmentTemperature sensing bag |
| Tp | Exhaust temperature sensing bag |
| Tx | Air suction temperature sensing bulb |
And acquiring the condensation temperature and the evaporation temperature of the air conditioner through a temperature sensing bulb at a corresponding position, and converting the condensation temperature and the evaporation temperature into corresponding condensation pressure and evaporation pressure according to a temperature-pressure corresponding table prestored in logic. The pressure difference between the condensing pressure and the evaporating pressure is then calculated. In the air conditioner, the evaporation pressure and the condensation pressure are equivalent to the suction pressure and the discharge pressure, so the pressure difference delta between the high-pressure pipe D and the low-pressure pipe S of the four-way valve can be determined as the current pressure difference according to the pressure difference between the condensation pressure and the evaporation pressure.
Step S20, when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner;
in this embodiment, when the current pressure difference is smaller than the preset pressure threshold, that is, the current pressure difference of the four-way valve is smaller than the frictional resistance, the exhaust temperature and the suction temperature of the air conditioner are further obtained through the exhaust temperature sensing bulb and the suction temperature sensing bulb of the air conditioner. And judging whether the four-way valve is reversed or not according to the exhaust temperature and the suction temperature, namely, the exhaust temperature is greater than a set value and the temperature difference between the exhaust temperature and the suction temperature is greater than the set value.
And step S30, determining whether the four-way valve has air leakage or not according to the pre-stored temperature parameter of the four-way valve, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve has air leakage.
In this embodiment, the exhaust temperature and the suction temperature are compared with a temperature parameter of the four-way valve during air leakage, and if the temperature parameter range of the four-way valve during air leakage is met, it is determined that air leakage occurs at the current time of the four-way valve, and the air conditioner is controlled to stop running, so that the compressor is prevented from being damaged due to long-term air leakage of the four-way valve. In a specific embodiment, if the exhaust temperature and the suction temperature do not conform to the temperature parameter range when the four-way valve generates air leakage, it is determined that the four-way valve does not generate air leakage currently, and the pressure parameter and the temperature parameter of the air conditioner are continuously detected.
It should be noted that step S30 specifically includes:
judging whether the exhaust temperature is not greater than the second temperature threshold value;
if the exhaust temperature is not greater than the second temperature threshold, judging whether a second temperature difference value between the exhaust temperature and the suction temperature is not greater than a second difference threshold;
and if the second temperature difference value is not greater than the second difference value threshold value, determining that the four-way valve has air leakage, and controlling the air conditioner to stop running.
In this embodiment, the second temperature threshold and the second difference threshold are determined according to the temperature parameter of the four-way valve with air leakage, where the second temperature threshold is a lowest temperature threshold of an exhaust temperature when the four-way valve with air leakage occurs, and the second difference threshold is a lowest difference threshold of the exhaust temperature and an air suction temperature when the four-way valve with air leakage occurs. And when the exhaust temperature is not greater than the second temperature threshold value and a second temperature difference value between the exhaust temperature and the air suction temperature is not greater than the second difference threshold value, determining that the four-way valve has air leakage, and controlling the air conditioner to stop running until the air leakage problem of the four-way valve is solved.
In the technical scheme that this embodiment provided, through the current pressure difference of comparison condensing pressure and evaporating pressure, and when the current pressure difference is less than preset pressure threshold value, the current pressure difference of cross valve is less than frictional resistance promptly, further judge whether exhaust temperature and inspiratory temperature are the same with the temperature parameter under the gas mixture state, thereby confirm whether the cross valve takes place the gas mixture, need not to change the hardware structure of cross valve, also need not to increase detection device in the air conditioner, can detect whether the gas mixture takes place for the cross valve, so that in time stop the operation of air conditioner, prevent to harm the compressor, the working property of compressor has been promoted, the life of air conditioner has been prolonged, the technical problem that the cross valve is in the gas mixture state for a long time and damages compressor working property has been solved.
Referring to fig. 4, fig. 4 is a second embodiment of the method for detecting air leakage of a four-way valve according to the present invention, and based on the first embodiment, the step S10 specifically includes:
step S11, when a reversing instruction of the four-way valve is detected, acquiring the current condensing temperature and the current evaporating temperature of the air conditioner;
step S12, converting the current condensing temperature into a corresponding condensing pressure and converting the current evaporating temperature into a corresponding evaporating pressure according to a preset corresponding relation table;
and step S13, calculating the pressure difference value between the evaporation pressure and the condensation pressure as the current pressure difference of the four-way valve.
In this embodiment, when a reversing instruction of the four-way valve is detected, the four-way valve is subjected to air leakage detection. The condensing temperature and the evaporating temperature of the air conditioner are obtained through a temperature sensing bulb at the corresponding position of the air conditioner, and are converted into corresponding condensing pressure and evaporating pressure according to a temperature-pressure corresponding table prestored in logic, namely according to the physical property relation of a refrigerant. The pressure difference between the condensing pressure and the evaporating pressure is then calculated. In the air conditioner, the evaporation pressure and the condensation pressure are equivalent to the suction pressure and the discharge pressure, so the pressure difference delta between the high-pressure pipe D and the low-pressure pipe S of the four-way valve can be determined as the current pressure difference according to the pressure difference between the condensation pressure and the evaporation pressure.
It should be noted that step S11 specifically includes:
when a reversing instruction of the four-way valve is detected, acquiring the initial condensing temperature of the air conditioner through a condenser temperature sensing bulb of the air conditioner, and acquiring the initial evaporating temperature of the air conditioner through an evaporator temperature sensing bulb;
determining a target condensation correction value and a target evaporation correction value corresponding to the air conditioner according to the air conditioner identifier;
and calculating the current condensation temperature of the air conditioner according to the initial condensation temperature and the target condensation correction value, and calculating the current evaporation temperature of the air conditioner according to the initial evaporation temperature and the target evaporation correction value.
In this embodiment, the condensing temperature may be obtained by the condenser bulb. Condenser temperature sensing package includes condenser export temperature sensing package and condenser coil pipe middle part temperature sensing package, in order to further promote condensing temperature's precision, in this embodiment, confirms initial condensing temperature through condenser coil pipe middle part temperature sensing package. And then adding the initial condensation temperature to a target condensation correction value to obtain the current condensation temperature of the air conditioner. The correction value is related to the air conditioner, the target condensation correction value can be determined according to the air conditioner identification, the target condensation correction value corresponding to the general air conditioner is 0, and the current evaporation temperature of the air conditioner is obtained in the same way.
In the technical scheme provided by this embodiment, the condensation temperature and the evaporation temperature of the air conditioner are obtained through the thermal bulb of the air conditioner itself, and the temperature parameter is converted into the corresponding pressure parameter, i.e. the condensation pressure and the evaporation pressure, according to the preset mapping table. The temperature detection device of the four-way valve is not required to be added, and the pressure detection device of the four-way valve is not required to be added, so that the manufacturing cost of the air conditioner is reduced.
Referring to fig. 5, fig. 5 is a third embodiment of the method for detecting air leakage of a four-way valve according to the present invention, and based on the first embodiment, after step S30, the method further includes:
step S40, when the current operation mode of the air conditioner is a refrigeration mode, acquiring the current outdoor temperature, and judging whether the current outdoor temperature is not greater than a first temperature threshold value;
step S50, when the current outdoor temperature is not larger than the first temperature threshold, acquiring the air suction temperature of the air conditioner, and calculating a first temperature difference value between the air suction temperature and the current outdoor temperature;
and step S60, when the first temperature difference is larger than a first difference threshold value, acquiring the current condensation temperature of the air conditioner, and when the air suction temperature is larger than the current condensation temperature, judging that the four-way valve has air leakage.
In this embodiment, the position of the inner slider of the four-way valve does not correspond to the general cooling mode when the air conditioner is cooling at low temperature. Therefore, when the air conditioner is detected to be in low-temperature refrigeration currently, namely when the current operation mode of the air conditioner is a refrigeration mode and the current outdoor temperature is not greater than a first temperature threshold (for example, 10 ℃), namely the air conditioner is in low-temperature refrigeration, the temperature parameters of the air conditioner, namely the air suction temperature and the current condensation temperature, are obtained, and the air suction temperature and the current condensation temperature are compared with the temperature parameters of the cross air of the four-way valve in the low-temperature refrigeration mode. Specifically, a first temperature difference between the suction temperature and the current outdoor temperature is calculated, the first temperature difference is compared with a temperature parameter (such as a first difference threshold) of the four-way valve with gas cross under the low-temperature refrigeration mode, then the suction temperature is compared with the current condensation temperature, and when the suction temperature is greater than the current condensation temperature, it is determined that gas cross is generated by the four-way valve. It should be noted that the above judgment conditions can be summarized according to experimental data.
In an embodiment, the method for detecting the cross gas of the four-way valve further includes:
when the reversing flag bit of the four-way valve is detected to be 1, the duration time that the reversing flag bit of the four-way valve is 1 is obtained, and when the duration time reaches a preset time threshold value, the four-way valve is judged to be successfully reversed.
In this embodiment, when it is detected that the duration of the reversing flag bit of the four-way valve is 1 reaches the preset time threshold, that is, the reversing duration of the four-way valve reaches a set value, for example, 10min or 5min to 20min, it may be determined that the four-way valve is successfully reversed, and the detection process of the cross air of the four-way valve may be exited.
In an embodiment, before the step of obtaining a duration time that a commutation flag bit of the four-way valve is 1 when it is detected that the commutation flag bit of the four-way valve is 1, and determining that the four-way valve successfully commutates when the duration time reaches a preset time threshold, the method further includes:
acquiring a current operation mode of the air conditioner, and judging whether an E pipe and an S pipe of the four-way valve are communicated or not by the position of an internal sliding block of the four-way valve when the current operation mode is a refrigeration mode, a defrosting mode or an oil return mode;
and if the position of an internal sliding block of the four-way valve enables an E pipe and an S pipe of the four-way valve to be communicated, setting a reversing mark position of the four-way valve to be 1.
In the embodiment, when the air conditioner is in a state mode such as a refrigeration mode, a defrosting mode, an oil return mode and the like, if the position of an internal sliding block of the four-way valve is detected, the E pipe is communicated with the S pipe; or when the air conditioner is in a heating mode, the controller logically defines a reversing mark position 1 of the four-way valve when the four-way valve is detected to be in a power-on state and the position of the internal sliding block enables the C pipe to be communicated with the S pipe.
In one embodiment, after the step of obtaining the current operation mode of the air conditioner and determining whether the position of the inner slider of the four-way valve communicates the E-tube and the S-tube of the four-way valve when the current operation mode is the cooling mode, the defrosting mode, or the oil return mode, the method further includes:
if the position of an internal sliding block of the four-way valve does not enable an E pipe and an S pipe of the four-way valve to be communicated, judging that the four-way valve has air leakage, controlling the air conditioner to stop, and setting a reversing flag bit of the four-way valve to be 0;
and after a preset time interval, restarting the air conditioner, and locking the air conditioner in a fault when detecting that the frequency of the cross-gas of the four-way valve in a preset time period of the air conditioner reaches a preset frequency threshold value.
In this embodiment, when the air conditioner is in a state mode such as a cooling mode, a defrosting mode, and an oil return mode, it is detected that the E pipe and the S pipe of the four-way valve are not communicated with each other at the position of the inner slider of the four-way valve, or when the air conditioner is in a heating mode, and it is detected that the four-way valve is in a power-on state, and it is detected that the C pipe and the S pipe are not communicated with each other at the position of the inner slider of the four-way valve, the controller logically defines a four-way valve reversing flag position 0. And after the air-cross protection is stopped for a preset time, if the air-cross protection is stopped for 3min, the whole air conditioner is controlled to be restarted, if the number of times of the air-cross of the four-way valve in a preset time period reaches a preset number threshold value, if the air-cross protection of the four-way valve occurs for 6 times in 2h, the air conditioner is locked in a fault, and the air conditioner cannot be restarted (a unit is powered off or all internal machines are shut down) until the fault is cleared.
The invention also provides an air conditioner, which comprises a memory, a processor and a refrigeration control program of the air conditioner, wherein the refrigeration control program of the air conditioner is stored in the memory and can run on the processor, and when being executed by the processor, the steps of the method for detecting the cross air of the four-way valve in the embodiment are realized.
The invention further provides a computer readable storage medium, which includes a refrigeration control program of an air conditioner, and the refrigeration control program of the air conditioner, when executed by a processor, implements the steps of the method for detecting cross gas of a four-way valve according to the above embodiment.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be substantially or partially embodied in the form of a software product, which is stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal air conditioner (e.g. a mobile phone, a computer, a server, an air conditioner, or a network air conditioner, etc.) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method for detecting the air leakage of a four-way valve is characterized by comprising the following steps of:
when a reversing instruction of the four-way valve is detected, acquiring the condensing pressure and the evaporating pressure of an air conditioner, and calculating the current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure;
when the current pressure difference is smaller than a preset pressure threshold, acquiring the exhaust temperature and the suction temperature of the air conditioner;
and determining whether the four-way valve generates air leakage or not according to the pre-stored temperature parameter of the four-way valve generating air leakage, the pre-stored exhaust temperature and the pre-stored air suction temperature, and controlling the air conditioner to stop running when the four-way valve generates air leakage.
2. The method for detecting cross-gas of a four-way valve according to claim 1, wherein the step of acquiring a condensing pressure and an evaporating pressure of an air conditioner when a reversing command of the four-way valve is detected, and calculating a current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure comprises the following steps:
when a reversing instruction of a four-way valve is detected, acquiring the current condensing temperature and the current evaporating temperature of the air conditioner;
converting the current condensing temperature into corresponding condensing pressure and converting the current evaporating temperature into corresponding evaporating pressure according to a preset corresponding relation table;
and calculating the pressure difference value of the evaporation pressure and the condensation pressure as the current pressure difference of the four-way valve.
3. The method for detecting cross-gas of a four-way valve according to claim 2, wherein the step of obtaining the current condensing temperature and the current evaporating temperature of the air conditioner when the reversing instruction of the four-way valve is detected specifically comprises:
when a reversing instruction of the four-way valve is detected, acquiring the initial condensing temperature of the air conditioner through a condenser temperature sensing bulb of the air conditioner, and acquiring the initial evaporating temperature of the air conditioner through an evaporator temperature sensing bulb;
determining a target condensation correction value and a target evaporation correction value corresponding to the air conditioner according to the air conditioner identifier;
and calculating the current condensation temperature of the air conditioner according to the initial condensation temperature and the target condensation correction value, and calculating the current evaporation temperature of the air conditioner according to the initial evaporation temperature and the target evaporation correction value.
4. The method for detecting cross-gas of a four-way valve according to claim 1, wherein the step of obtaining a condensing pressure and an evaporating pressure of an air conditioner when a reversing command of the four-way valve is detected, and calculating a current pressure difference of the four-way valve according to the condensing pressure and the evaporating pressure further comprises the steps of:
when the current operation mode of the air conditioner is a refrigeration mode, acquiring the current outdoor temperature, and judging whether the current outdoor temperature is not greater than a first temperature threshold value;
when the current outdoor temperature is not greater than the first temperature threshold, acquiring the air suction temperature of the air conditioner, and calculating a first temperature difference value between the air suction temperature and the current outdoor temperature;
and when the first temperature difference is greater than a first difference threshold value, acquiring the current condensation temperature of the air conditioner, and when the air suction temperature is greater than the current condensation temperature, judging that the four-way valve generates air mixing.
5. The method for detecting cross gas of a four-way valve according to claim 1, further comprising:
when the reversing flag bit of the four-way valve is detected to be 1, the duration time that the reversing flag bit of the four-way valve is 1 is obtained, and when the duration time reaches a preset time threshold value, the four-way valve is judged to be successfully reversed.
6. The method for detecting cross-gas of a four-way valve according to claim 5, wherein before the step of obtaining the duration that the reversing flag bit of the four-way valve is 1 when the reversing flag bit of the four-way valve is detected to be 1, and determining that the four-way valve is successfully reversed when the duration reaches a preset time threshold, the method further comprises:
acquiring a current operation mode of the air conditioner, and judging whether an E pipe and an S pipe of the four-way valve are communicated or not by the position of an internal sliding block of the four-way valve when the current operation mode is a refrigeration mode, a defrosting mode or an oil return mode;
and if the position of an internal sliding block of the four-way valve enables an E pipe and an S pipe of the four-way valve to be communicated, setting a reversing mark position of the four-way valve to be 1.
7. The method for detecting cross-gas of a four-way valve according to claim 6, wherein the step of obtaining a current operation mode of the air conditioner and determining whether an E-tube and an S-tube of the four-way valve are communicated with each other by an internal slider position of the four-way valve when the current operation mode is a cooling mode, a defrosting mode or an oil return mode further comprises:
if the position of an internal sliding block of the four-way valve does not enable an E pipe and an S pipe of the four-way valve to be communicated, judging that the four-way valve has air leakage, controlling the air conditioner to stop, and setting a reversing flag bit of the four-way valve to be 0;
and after a preset time interval, restarting the air conditioner, and locking the air conditioner in a fault when detecting that the frequency of the cross-gas of the four-way valve in a preset time period of the air conditioner reaches a preset frequency threshold value.
8. The method according to any of claims 1-7, wherein the temperature parameter of the four-way valve for cross-gas comprises a second temperature threshold and a second difference threshold, and the step of determining whether cross-gas occurs in the four-way valve according to the pre-stored temperature parameter of the four-way valve for cross-gas, the pre-stored exhaust temperature and the pre-stored suction temperature, and controlling the air conditioner to stop operating when cross-gas occurs in the four-way valve specifically comprises:
judging whether the exhaust temperature is not greater than the second temperature threshold value;
if the exhaust temperature is not greater than the second temperature threshold, judging whether a second temperature difference value between the exhaust temperature and the suction temperature is not greater than a second difference threshold;
and if the second temperature difference value is not greater than the second difference value threshold value, determining that the four-way valve has air leakage, and controlling the air conditioner to stop running.
9. An air conditioner, characterized in that the air conditioner comprises a memory, a processor and a refrigeration control program of the air conditioner stored in the memory and operable on the processor, wherein the refrigeration control program of the air conditioner, when executed by the processor, implements the steps of the cross air detection method of the four-way valve as recited in any one of claims 1 to 8.
10. A computer-readable storage medium, comprising a refrigeration control program of an air conditioner, wherein the refrigeration control program of the air conditioner, when executed by a processor, implements the steps of the cross-gas detection method of a four-way valve according to any one of claims 1 to 8.
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