CN110857812B - Air conditioner and air conditioner refrigerant leakage detection method - Google Patents
Air conditioner and air conditioner refrigerant leakage detection method Download PDFInfo
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
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- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- 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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F2110/00—Control inputs relating to air properties
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Abstract
The invention provides an air conditioner and a method for detecting refrigerant leakage of the air conditioner, which comprises the following steps: s1, starting the computer, and acquiring a pre-operation frequency f 0; s2, pre-running an air conditioner, and controlling the compressor to run according to f 0; s3, continuously sampling the pressure of the compressor suction pipe after the compressor suction pipe is operated for a time period of t 1; s4, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value; if yes, the refrigerant leaks, otherwise, the step S5 is performed; s5, controlling the compressor to run at a frequency f1, and acquiring the temperature T11 of a return air pipe of the compressor; s6, judging whether the T11 is larger than a preset temperature value or not; if yes, go to step S7; if not, operating according to a preset mode; s7, controlling the compressor to operate at the frequency f2, and obtaining the condenser supercooling degree T0; s8, judging whether the T0 is smaller than a second preset value or not; if yes, the refrigerant leaks; otherwise, the operation is carried out according to a preset mode. The air conditioner refrigerant leakage detection method improves the accuracy of the air conditioner in refrigerant leakage detection and avoids the occurrence of misjudgment.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a method for detecting refrigerant leakage of the air conditioner.
Background
With the progress of the current society and the development of economy, the air conditioner is taken as an important electrical appliance in daily life of people and has gone into thousands of households. However, in the installation process and the long-term use process of the air conditioner, the pipeline may be damaged due to poor sealing performance, bending, long-term corrosion or other external insurability, and the air conditioner refrigerant may leak. Fundamentally, the refrigerant leakage is reflected in the reduction of refrigerant flow, the performance of the air conditioner is reduced due to the insufficient refrigerant flow, the compressor is enabled to run under the poor condition, and the compressor is even damaged in the severe condition.
Most of the prior art adopts a temperature sensor or a pressure sensor to detect whether a refrigerant leaks or not, and when the refrigerant leakage is detected, an air conditioner sends a protection instruction to stop the whole machine from running; because most areas in China belong to temperate climates, the fluctuation of the conditions such as air temperature and humidity in four seasons is large, the air conditioning system is easy to misjudge under some extreme working conditions of the air conditioner or in the process from the beginning of running to the stable running of the air conditioning system, and the accuracy of the air conditioner in judging the leakage of the refrigerant is influenced.
The applicant has started the technical research on the prevention of the leakage of the refrigerant of the air conditioner in the early period and filed the related patent applications with the application numbers of: CN200910099237.9, invention name: a method for judging the leakage of refrigerant in air conditioner is disclosed, which comprises the following steps: a. recording the temperature T of the indoor coil before the compressor is started; b. judging whether the compressor is started, if so, carrying out the next step, otherwise, returning to the step a; c. judging whether the compressor continuously runs for x minutes, if so, performing the next step, otherwise, returning to the step b; d. recording the indoor coil temperature T' and the simultaneous indoor temperature Tr when the compressor continuously operates for x minutes; e. calculating the temperature difference between the indoor coil temperature T 'when the compressor continuously operates for x minutes and the indoor coil temperature T before the compressor starts, calculating the temperature difference between the indoor coil temperature T' when the compressor continuously operates for x minutes and the indoor temperature Tr at the same time, judging whether the two temperature differences are smaller than y, if so, entering the step f, otherwise, resetting the operation time of the compressor and returning to the step b; f. and (5) stopping the machine and reporting faults. However, as the applicant further studies on the refrigerant leakage prevention of the air conditioner, it is found that the technical scheme in the application is also prone to have a misjudgment phenomenon in a specific implementation process, especially in some specific use environments, and the accuracy of the air conditioner in judging the refrigerant leakage is affected.
Disclosure of Invention
In view of the above, the present invention is directed to a method for detecting refrigerant leakage of an air conditioner and an air conditioner, so as to solve the problem that an air conditioning system in the prior art is prone to misjudgment when refrigerant leakage occurs, and improve the accuracy of the air conditioner in judging refrigerant leakage.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner refrigerant leakage detection method comprises the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
s2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s3, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
s4, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
s5, finishing pre-operation of the air conditioner, controlling the compressor to operate at a frequency f1, and acquiring the temperature T11 of a return air pipe of the compressor;
s6, judging whether the temperature T11 of the return air pipe of the compressor is greater than a preset temperature value or not by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s7, controlling the compressor to run at a frequency f2 by the air conditioner, and acquiring the supercooling degree T0 of the condenser;
s8, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; if not, operating according to a preset mode;
wherein f1 is more than f0, and f2 is less than f 0.
Further, the related information before operation includes a preset mode, a before-operation outdoor temperature T21, and a before-operation indoor temperature T22;
the preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user.
Further, step S5 includes:
s501, finishing pre-operation of the air conditioner, and controlling the compressor to operate at a frequency f 1;
s502, after the air conditioner runs for a time period of T2, acquiring the current date and the temperature T11 of a compressor return air pipe;
further, step S6 includes:
s601, judging whether the current date is summer by the air conditioner; if yes, go to step S603; otherwise, go to step S602;
s602, judging whether the current date is winter by the air conditioner; if yes, go to step S604; otherwise, go to step S605;
s603, judging whether the temperature T11 of the return air pipe of the compressor is higher than a first preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s604, judging whether the temperature T11 of the return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s605, judging whether the temperature T11 of the return air pipe of the compressor is higher than a third preset temperature by the air conditioner; if yes, go to step S7; otherwise, the operation is carried out according to a preset mode.
Further, step S7 includes:
s701, controlling the compressor to run at a frequency f2 by the air conditioner;
s702, after the air conditioner runs for a time period of T3, acquiring condenser outlet pressure P11 and condenser outlet temperature T12;
s703, acquiring a refrigerant saturation temperature T13 by the air conditioner according to the condenser outlet pressure P11;
s704, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12.
Further, the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T13 — the condenser outlet temperature T12.
Further, step S8 includes:
s801, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S802;
s802, the air conditioner operates according to a preset mode;
s803, judging whether the running time reaches the preset time by the air conditioner; if yes, the step S701 is returned to; otherwise, the process returns to step S802.
An air conditioner refrigerant leakage detection method comprises the following steps:
s01, starting the air conditioner, and acquiring a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s03, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s04, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
s05, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S06 is performed;
s06, finishing the pre-operation of the air conditioner, and controlling the compressor to operate at the frequency f 1;
s07, after the air conditioner runs for a time period of T2, acquiring the current date and the temperature T11 of a return air pipe of the compressor;
s08, judging whether the current date is summer by the air conditioner; if yes, go to step S10; otherwise, go to step S09;
s09, judging whether the current date is winter by the air conditioner; if yes, go to step S11; otherwise, go to step S12;
s10, judging whether the temperature T11 of a return air pipe of the compressor is greater than a first preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s11, judging whether the temperature T11 of a return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s12, judging whether the temperature T11 of a return air pipe of the compressor is greater than a third preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s13, the air conditioner controls the compressor to run at the frequency f2 and controls the counter to return to zero;
s14, after the air conditioner runs for a time period of T3, acquiring the outlet pressure P11 and the outlet temperature T12 of the condenser;
s15, the air conditioner obtains the refrigerant saturation temperature T13 according to the condenser outlet pressure P11;
s16, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12, and the count value of the counter is controlled to be increased by 1;
s17, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S18;
s18, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, return to step S14; otherwise, go to step S19;
s19, operating the air conditioner according to a preset mode;
s20, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S13; otherwise, the process returns to step S19.
Further, f1 is more than f0, and f2 is less than f 0; the condenser subcooling degree T0 is equal to the refrigerant saturation temperature T13 — the condenser outlet temperature T12.
An air conditioner adopts the air conditioner refrigerant leakage detection method.
Compared with the prior art, the air conditioner and the air conditioner refrigerant leakage detection method have the following advantages:
according to the air conditioner and the air conditioner refrigerant leakage detection method, before the air conditioner operates according to the preset mode, the air conditioner pre-operation process is set, and refrigerant leakage is detected and analyzed in the pre-operation process stage, so that the accuracy of judgment of the air conditioner on the refrigerant leakage is improved, and the occurrence of misjudgment is reduced.
In addition, the air conditioner and the method for detecting the refrigerant leakage of the air conditioner adjust the air conditioner to be in high-frequency operation after the pre-operation of the air conditioner is finished, and detect the refrigerant leakage by combining the seasonal conditions, so that the interference of seasonal factors on the refrigerant leakage detection is reduced; in addition, after the air conditioner is judged to have the refrigerant leakage possibly, the air conditioner is adjusted to be in low-frequency operation, the refrigerant leakage of the air conditioner is judged for multiple times according to the condition of the supercooling degree of the condenser, the accuracy of the judgment of the refrigerant leakage by the air conditioner is further improved, and the occurrence of misjudgment is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of an air conditioner and a method for detecting refrigerant leakage of the air conditioner according to an embodiment of the present invention;
fig. 2 is another schematic flow chart of an air conditioner and a method for detecting refrigerant leakage of the air conditioner according to an embodiment of the present invention;
fig. 3 is a flowchart of an air conditioner and a method for detecting refrigerant leakage of the air conditioner according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
First, it should be noted that, without any specific explanation, the air conditioner or the air conditioner in the present invention is referred to as an inverter air conditioner.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
As shown in fig. 1, the present embodiment provides a method for detecting refrigerant leakage of an air conditioner, where an execution main body of the method is an air conditioner, and the method includes the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
the related information before operation comprises a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation; wherein, the air conditioner detects each item temperature parameter respectively through setting up a plurality of temperature sensor.
The preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user; specifically, if the user actively sets an operation mode when the air conditioner is started at this time, the preset mode is the operation mode set by the user; if the user does not set the operation mode, the preset mode is the operation mode of the air conditioner before the air conditioner is turned off at the last time;
in addition, before the air conditioner leaves the factory, an air conditioner manufacturer presets a plurality of pre-operation frequencies and corresponding relations between each pre-operation frequency and different air conditioner related parameters (such as data of a preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22 and the like) in an air conditioner data storage device;
the air conditioner calls a corresponding pre-operation frequency f0 from an air conditioner data storage device according to at least two data information of a preset mode, a pre-operation outdoor temperature T21 and a pre-operation indoor temperature T22; preferably, the air conditioner acquires a corresponding pre-operation frequency f0 from the air conditioner data storage device according to three data information, namely a preset mode, a pre-operation outdoor temperature T21 and a pre-operation indoor temperature T22, wherein f0 < the maximum operation frequency fmax of the air conditioner.
S2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
in the air conditioner pre-operation stage, the compressor keeps the pre-operation frequency f0 in operation, on one hand, the use requirement of a user on the air conditioner is met, and on the other hand, the air conditioner enters a stable operation state, so that the detection of refrigerant leakage is facilitated.
S3, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
the air conditioner is characterized in that a pressure acquisition device is arranged at the air suction pipe of the compressor and used for acquiring the pressure of the air suction pipe of the compressor in real time, and the pressure acquisition device can be a pressure sensor or a pressure switch.
S4, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
the first preset value is the pressure variation or the pressure variation rate in unit time, and the value of the first preset value is a negative number; compared with the external atmospheric environment, the air-conditioning refrigerant pipeline is often in a high-pressure environment, and when refrigerant leakage occurs, the pressure in the refrigerant pipeline is rapidly reduced; therefore, the variation or the variation rate of the pressure of the suction pipe of the compressor in the preset time is a negative value, and when the variation or the variation rate is smaller than a first preset value, the refrigerant leakage of the air conditioner is indicated;
through setting up the air conditioner operation in advance process to after the air conditioner operation in advance carries out steadily, sample the compressor suction pipe pressure through pressure acquisition device once more, judge suction pipe pressure at the change volume or the rate of change of presetting time, thereby be favorable to improving the air conditioner and leak the accuracy of judging to the refrigerant, reduce the emergence of the erroneous judgement condition.
S5, finishing pre-operation of the air conditioner, controlling the compressor to operate at a frequency f1, and acquiring the temperature T11 of a return air pipe of the compressor;
wherein f1 is more than f 0; in the pre-operation process, if the air conditioner does not detect the occurrence of refrigerant leakage, the pre-operation stage is ended, and high-frequency operation is started, so that the indoor environment can reach the state corresponding to the preset mode as soon as possible.
S6, judging whether the temperature T11 of the return air pipe of the compressor is greater than a preset temperature value or not by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
in the running process of the air conditioner, the cold medium exchanges heat with air through the evaporator, at the moment, the cold medium absorbs heat and heats up, and then the refrigerant flowing through the evaporator enters the compressor through the compressor air return pipe to circulate again; when the air conditioner normally operates and a refrigerant is not leaked, a compressor muffler of the air conditioner is always kept in a stable range; when the refrigerant leaks from the air conditioner, the refrigerant quantity in the pipeline is reduced, and the refrigerant in the evaporator carries out excessive heat exchange, so that the temperature of the refrigerant flowing through the evaporator is increased, and a compressor muffler is also increased; therefore, in the embodiment, the temperature T11 of the compressor return air pipe is detected, and the temperature T11 of the compressor return air pipe is compared with the preset temperature value to serve as a basis for judging whether the refrigerant leaks, so that the accuracy of judging the refrigerant leakage by the air conditioner is improved, and the occurrence of misjudgment is avoided.
In the actual use process, air conditioners produced by different air conditioner manufacturers have certain differences in air conditioner type, power and types of filled refrigerants; correspondingly, the temperature of the compressor return air pipe and the preset temperature value are different; specifically, before the air conditioner leaves the factory, the preset temperature value is data information pre-stored in an air conditioner data storage device by an air conditioner manufacturer according to the actual condition of the air conditioner.
S7, controlling the compressor to run at a frequency f2 by the air conditioner, and acquiring the supercooling degree T0 of the condenser;
wherein f2 is less than f 0; in the high-frequency operation stage, if the temperature T11 of the return air pipe of the compressor is detected to be greater than a preset temperature value, the air conditioner is indicated to be likely to have refrigerant leakage; for further verification, the air conditioner starts low-frequency operation, and secondary detection is carried out on refrigerant leakage;
in the process, the air conditioner starts low-frequency operation, on one hand, the consumption of the air conditioner on electric energy is reduced on the premise of controlling the indoor environment condition to be stable; on the other hand, the compressor in a high-frequency operation state is prevented from being damaged by the possible refrigerant leakage condition, so that the air conditioner controls the low-frequency operation of the compressor to reduce the risk of damage of the compressor and correspondingly protect the compressor.
S8, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; if not, operating according to a preset mode;
in the operation process of the air conditioner, the cold medium is changed into a high-temperature and high-pressure gaseous medium through a compressor; then, the high-temperature high-pressure gaseous refrigerant medium is changed into a medium-temperature high-pressure liquid medium through a condenser, and for the gaseous refrigerant medium, in the process of changing the gaseous state into the liquid state, the supercooling phenomenon of a refrigerant can occur, namely the refrigerant has a supercooling degree parameter at the condenser; when the air conditioner normally operates and the refrigerant is not leaked, the supercooling degree parameter is always kept in a stable range; when the air conditioner leaks the refrigerant, the supercooling degree parameter of the air conditioner is reduced, and even becomes 0 degree when the leakage is serious, and particularly in the air conditioner provided with the air-cooled condenser, the supercooling degree parameter is greatly influenced by the refrigerant leakage; therefore, the condenser supercooling degree is obtained and used as a basis for detecting refrigerant leakage, and compared with a refrigerant leakage detection method in the prior art, the method can effectively improve the accuracy of the air conditioner in judging the refrigerant leakage and avoid the occurrence of misjudgment.
In the actual use process, air conditioners produced by different air conditioner manufacturers have certain differences in air conditioner type, power and types of filled refrigerants; correspondingly, the supercooling degree condition and the second preset value are different; specifically, before the air conditioner leaves the factory, the second preset value is data information pre-stored in the air conditioner data storage device by the air conditioner manufacturer according to the actual condition of the air conditioner.
Example 2
As shown in fig. 2, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, this embodiment further describes a refrigerant leakage detection process of the air conditioner in a high-frequency operation stage on the basis of embodiment 1, and specifically, details of step S5 and step S6 are described.
Specifically, step S5 includes:
s501, finishing pre-operation of the air conditioner, and controlling the compressor to operate at a frequency f 1;
wherein f1 is more than f 0; specifically, f1 is n × f0, and f1 is not more than the maximum operating frequency fmax of the compressor; n is a preset value and is more than 1; the process is that the air conditioner finishes the pre-operation and starts the high-frequency operation at the same time, which is beneficial to enabling the indoor environment to reach the state corresponding to the preset mode as soon as possible.
S502, after the air conditioner runs for T2 time, the current date and the temperature T11 of the compressor return air pipe are obtained.
The air conditioner is provided with a time module on the control panel and used for acquiring the current date; the air conditioner is provided with a temperature sensor on the compressor return air pipe and is used for acquiring the temperature T11 of the compressor return air pipe.
Step S6 includes:
s601, judging whether the current date is summer by the air conditioner; if yes, go to step S603; otherwise, go to step S602;
s602, judging whether the current date is winter by the air conditioner; if yes, go to step S604; otherwise, go to step S605;
s603, judging whether the temperature T11 of the return air pipe of the compressor is higher than a first preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s604, judging whether the temperature T11 of the return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s605, judging whether the temperature T11 of the return air pipe of the compressor is higher than a third preset temperature by the air conditioner; if yes, go to step S7; otherwise, the operation is carried out according to a preset mode.
Because most areas of China belong to temperate climates, the fluctuation of temperature, humidity and the like is large all the year round, and particularly, the temperature and humidity in summer are greatly different from the temperature and humidity in winter; if the judgment of refrigerant leakage is carried out by simply adopting the index of the temperature of the return pipe of the compressor in the prior art, the condition of misjudgment often occurs due to the influence of the external environment;
therefore, the present embodiment combines the situation that the four seasons are clear in most regions of our country, the current date obtained by the air conditioner, the season to which the current date belongs, and at least three different judgment conditions are set according to the situation of different seasons; preferably, when the current date is summer, the corresponding judgment condition is that the temperature T11 of the return air pipe of the compressor is higher than a first preset temperature; when the current date is in winter, the corresponding judgment condition is that the temperature T11 of the return air pipe of the compressor is higher than a second preset temperature; when the current date is spring or autumn, the corresponding judgment condition is that the temperature T11 of the compressor return air pipe is higher than a third preset temperature; accordingly, the first preset temperature > the third preset temperature > the second preset temperature.
Correspondingly, after the season is determined, through the judging process, if the judging condition corresponding to the season is not met, the fact that the refrigerant leakage of the air conditioner does not occur temporarily is indicated, and the air conditioner can operate according to a preset mode; if the judgment condition corresponding to the season is satisfied, it is determined that the air conditioner may have refrigerant leakage, and the air conditioner continues to perform step S7 to further verify the refrigerant leakage, so as to ensure the accuracy of refrigerant leakage detection and reduce the occurrence of misjudgment.
Example 3
As shown in fig. 2, in order to further explain the supercooling degree detecting process of the present invention, this embodiment further explains step S7 on the basis of embodiment 1 or embodiment 2.
Specifically, the step S7 includes:
s701, controlling the compressor to run at a frequency f2 by the air conditioner;
wherein f2 is less than f 0; in the high-frequency operation stage, if the air conditioner is detected to have refrigerant leakage possibly; for further verification, the air conditioner starts low-frequency operation, and secondary detection is carried out on refrigerant leakage;
specifically, f2 is m × f0, and f2 is not less than the lowest operation frequency fmin of the compressor; m is a preset value, and m is more than 0 and less than 1; the process is that the air conditioner starts to run at low frequency, on one hand, the consumption of the air conditioner on electric energy is reduced on the premise of controlling the indoor environment condition to be stable; on the other hand, the compressor in a high-frequency operation state is prevented from being damaged by the possible refrigerant leakage condition, the risk of damage to the compressor is reduced by controlling the low-frequency operation of the compressor, and the compressor is correspondingly protected.
S702, after the air conditioner runs for a time period of T3, acquiring condenser outlet pressure P11 and condenser outlet temperature T12;
in the low-frequency operation stage, after the air conditioner operates for a time period of T3, after the air conditioner operates stably, the pressure sensor and the temperature sensor are arranged at the outlet of the condenser, and the outlet pressure P11 and the outlet temperature T12 of the condenser are obtained; the condenser outlet pressure P11 is an actual pressure value of the refrigerant at the condenser outlet; the condenser outlet temperature T12 is an actual temperature value of the refrigerant at the condenser outlet.
S703, acquiring a refrigerant saturation temperature T13 by the air conditioner according to the condenser outlet pressure P11;
for the gas-liquid two phases of the refrigerant substance, corresponding refrigerant saturation temperature exists in a certain pressure range, and the gas-liquid two phases are in a dynamic balance state at the moment.
Correspondingly, before the air conditioner leaves the factory, an air conditioner manufacturer presets a refrigerant saturation temperature value corresponding to each condenser outlet pressure value in an air conditioner data storage device, or a corresponding relation between the condenser outlet pressure value and the refrigerant saturation temperature value.
In addition, if the refrigerant in the air conditioner is a single component, the single component is taken as a reference substance according to the corresponding condition between the outlet pressure value of the condenser and the saturation temperature value of the refrigerant; if the refrigerant in the air conditioner is a mixed component, the correspondence between the outlet pressure value of the condenser and the saturation temperature value of the refrigerant is preferably based on one component with the largest content.
S704, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12.
The condenser supercooling degree is the supercooling degree of a refrigerant in the condenser, and is the difference between the refrigerant saturation temperature corresponding to the actual pressure of the refrigerant at the outlet of the condenser and the actual temperature of the refrigerant at the outlet of the condenser, namely the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T13-the condenser outlet temperature T12.
For step S8: the air conditioner judges whether the condenser supercooling degree T0 is smaller than a second preset value or not; if yes, refrigerant leakage occurs; if not, operating according to a preset mode; by comparing the condenser supercooling degree calculated in the step S704 as a basis for detecting refrigerant leakage with a second preset value prestored in the air conditioner, the refrigerant leakage condition can be judged and analyzed more intuitively, the accuracy of the air conditioner in judging refrigerant leakage is effectively improved, and the occurrence of erroneous judgment is avoided.
In addition, in order to ensure that the air conditioner can detect the refrigerant leakage regularly during the normal operation, step S8 includes:
s801, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S802;
s802, the air conditioner operates according to a preset mode;
s803, judging whether the running time reaches the preset time by the air conditioner; if yes, returning to the step S701; if not, the process returns to step S802.
Therefore, after the air conditioner is started to operate and the corresponding refrigerant leakage is detected and analyzed, if the refrigerant leakage is judged not to occur, the air conditioner operates according to a preset mode, and after the operation reaches a preset time, the operation returns to the step S701, the refrigerant leakage is detected and analyzed again for the air conditioner, so that a closed detection and analysis process is formed, the refrigerant leakage can be detected in each stage of the operation of the air conditioner until the operation of the air conditioner is finished, and the refrigerant leakage which possibly occurs at any time in the use process of the air conditioner is effectively detected and protected.
Example 4
As shown in fig. 3, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, the present embodiment provides another method for detecting refrigerant leakage of an air conditioner, which specifically includes:
s01, starting the air conditioner, and acquiring a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s03, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s04, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
s05, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S06 is performed;
s06, finishing the pre-operation of the air conditioner, and controlling the compressor to operate at the frequency f 1;
wherein f1 is more than f 0; specifically, f1 is n × f0, and f1 is not more than the maximum operating frequency fmax of the compressor; n is a preset value and n is more than 1.
S07, after the air conditioner runs for a time period of T2, acquiring the current date and the temperature T11 of a return air pipe of the compressor;
s08, judging whether the current date is summer by the air conditioner; if yes, go to step S10; otherwise, go to step S09;
s09, judging whether the current date is winter by the air conditioner; if yes, go to step S11; otherwise, go to step S12;
s10, judging whether the temperature T11 of a return air pipe of the compressor is greater than a first preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s11, judging whether the temperature T11 of a return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s12, judging whether the temperature T11 of a return air pipe of the compressor is greater than a third preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s13, the air conditioner controls the compressor to run at the frequency f2 and controls the counter to return to zero;
wherein f2 is less than f 0; specifically, f2 is m × f0, and f2 is not less than the lowest operation frequency fmin of the compressor; m is a preset value, and m is more than 0 and less than 1.
S14, after the air conditioner runs for a time period of T3, acquiring the outlet pressure P11 and the outlet temperature T12 of the condenser;
s15, the air conditioner obtains the refrigerant saturation temperature T13 according to the condenser outlet pressure P11;
s16, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12, and the count value of the counter is controlled to be increased by 1;
the condenser supercooling degree T0 is equal to the refrigerant saturation temperature T13 — the condenser outlet temperature T12.
S17, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S18;
s18, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, return to step S14; otherwise, go to step S19;
s19, operating the air conditioner according to a preset mode;
s20, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S13; if not, the process returns to step S19.
In the method, in the refrigerant leakage detection and analysis process of the air conditioner in the preset mode operation stage, the counting process is set, and the air conditioner is subjected to multiple detection processing in the preset mode operation stage, so that the accuracy of judgment of the air conditioner on the refrigerant leakage is further improved, the occurrence of misjudgment is avoided, and the refrigerant leakage which possibly occurs at any time in the air conditioner use process is effectively detected and protected.
Example 5
The present embodiment provides an air conditioner, which employs the method for detecting refrigerant leakage of an air conditioner provided in any one of embodiments 1 to 4. Specifically, the air conditioner includes:
the central processing unit is used for processing the related information of the refrigerant leakage of the air conditioner, including analyzing and processing related data, sending corresponding control instructions to related components of the air conditioner and the like;
the first temperature sensor is arranged on the compressor return pipe, connected with the central processing unit and used for acquiring the temperature of the compressor return pipe;
the second temperature sensor is arranged on the shell of the air-conditioning indoor unit and is connected with the central processing unit for acquiring the indoor temperature;
the third temperature sensor is arranged on the shell of the air conditioner outdoor unit and is connected with the central processing unit and used for acquiring the outdoor temperature;
the fourth temperature sensor is arranged at the outlet of the condenser, and is connected with the central processing unit and used for acquiring the outlet temperature of the condenser;
the first pressure sensor is arranged on the air suction pipe of the compressor, connected with the central processing unit and used for acquiring the pressure of the air suction pipe;
the second pressure sensor is arranged at the outlet of the condenser, and is connected with the central processing unit and used for acquiring the outlet pressure of the condenser;
the time module is arranged on the air conditioner control panel, is connected with the central processing unit and is used for acquiring information such as date and time;
the counter is connected with the central processing unit and is used for counting in the detection process;
and the memory is connected with the central processing unit and used for storing the related data of the air-conditioning refrigerant leakage.
The related data stored in the memory at least includes data related to an air conditioner operation mode, an operation frequency related to a compressor, a correspondence between a preset operation frequency and a preset mode, a correspondence between an outdoor temperature T21 before operation and an indoor temperature T22 before operation, a first preset value, a second preset value, refrigerant saturation temperature values corresponding to different condenser outlet pressure values (or a correspondence between a condenser outlet pressure value and a refrigerant saturation temperature value), a preset value of a counter, a corresponding preset time, a season rule, a first preset temperature, a second preset temperature, a third preset temperature and the like.
In particular, the memory comprises storage media of at least one of the following storage media types: a flash memory type, a hard disk type, a Solid State Disk (SSD) type, a Silicon Disk Drive (SDD) type, a multimedia card micro type, a card type memory (SD or XD memory type), a Random Access Memory (RAM) type, a Static Random Access Memory (SRAM) type, a Read Only Memory (ROM) type, an Electrically Erasable Programmable Read Only Memory (EEPROM) type, a Programmable Read Only Memory (PROM) type, a magnetic memory type, a magnetic disk type, and an optical disk type.
In addition, on the basis of the structure of the air conditioner in this embodiment, the air conditioner further includes other components of the indoor unit and the outdoor unit of the air conditioner, such as a shell structure, an air guide mechanism, a variable frequency compressor, a coil structure, and the like, which are not described herein again in view of the fact that they are all the prior art; in addition, it should be noted that the air conditioning structure or the components in the embodiment may be obtained commercially or produced by conventional processing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for detecting leakage of refrigerant of an air conditioner is characterized by comprising the following steps:
s1, starting the air conditioner, acquiring relevant information before operation, and acquiring a pre-operation frequency f0 according to the relevant information before operation;
s2, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s3, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
s4, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
s5, finishing pre-operation of the air conditioner, controlling the compressor to operate at a frequency f1, and acquiring the temperature T11 of a return air pipe of the compressor;
s6, judging whether the temperature T11 of the return air pipe of the compressor is greater than a preset temperature value or not by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s7, controlling the compressor to run at a frequency f2 by the air conditioner, and acquiring the supercooling degree T0 of the condenser;
s8, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; if not, operating according to a preset mode;
wherein f1 is more than f0, and f2 is less than f 0.
2. The method as claimed in claim 1, wherein the pre-operation related information includes a preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22;
the preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user.
3. The method as claimed in claim 1, wherein the step S5 includes:
s501, finishing pre-operation of the air conditioner, and controlling the compressor to operate at a frequency f 1;
s502, after the air conditioner runs for T2 time, the current date and the temperature T11 of the compressor return air pipe are obtained.
4. The method as claimed in claim 3, wherein the step S6 includes:
s601, judging whether the current date is summer by the air conditioner; if yes, go to step S603; otherwise, go to step S602;
s602, judging whether the current date is winter by the air conditioner; if yes, go to step S604; otherwise, go to step S605;
s603, judging whether the temperature T11 of the return air pipe of the compressor is higher than a first preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s604, judging whether the temperature T11 of the return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S7; if not, operating according to a preset mode;
s605, judging whether the temperature T11 of the return air pipe of the compressor is higher than a third preset temperature by the air conditioner; if yes, go to step S7; otherwise, the operation is carried out according to a preset mode.
5. The method as claimed in claim 1, wherein the step S7 includes:
s701, controlling the compressor to run at a frequency f2 by the air conditioner;
s702, after the air conditioner runs for a time period of T3, acquiring condenser outlet pressure P11 and condenser outlet temperature T12;
s703, acquiring a refrigerant saturation temperature T13 by the air conditioner according to the condenser outlet pressure P11;
s704, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12.
6. The method as claimed in claim 5, wherein the degree of subcooling T0 is the refrigerant saturation temperature T13-the condenser outlet temperature T12.
7. The method as claimed in claim 5, wherein the step S8 includes:
s801, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S802;
s802, the air conditioner operates according to a preset mode;
s803, judging whether the running time reaches the preset time by the air conditioner; if yes, the step S701 is returned to; otherwise, the process returns to step S802.
8. A method for detecting leakage of refrigerant of an air conditioner is characterized by comprising the following steps:
s01, starting the air conditioner, and acquiring a preset mode, an outdoor temperature T21 before operation and an indoor temperature T22 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a preset mode, the outdoor temperature T21 before operation and the indoor temperature T22 before operation;
s03, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s04, continuously sampling the pressure of the air suction pipe of the compressor after the air conditioner runs for a time t 1;
s05, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a first preset value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S06 is performed;
s06, finishing the pre-operation of the air conditioner, and controlling the compressor to operate at the frequency f 1;
s07, after the air conditioner runs for a time period of T2, acquiring the current date and the temperature T11 of a return air pipe of the compressor;
s08, judging whether the current date is summer by the air conditioner; if yes, go to step S10; otherwise, go to step S09;
s09, judging whether the current date is winter by the air conditioner; if yes, go to step S11; otherwise, go to step S12;
s10, judging whether the temperature T11 of a return air pipe of the compressor is greater than a first preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s11, judging whether the temperature T11 of a return air pipe of the compressor is greater than a second preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s12, judging whether the temperature T11 of a return air pipe of the compressor is greater than a third preset temperature by the air conditioner; if yes, go to step S13; otherwise, go to step S19;
s13, the air conditioner controls the compressor to run at the frequency f2 and controls the counter to return to zero;
s14, after the air conditioner runs for a time period of T3, acquiring the outlet pressure P11 and the outlet temperature T12 of the condenser;
s15, the air conditioner obtains the refrigerant saturation temperature T13 according to the condenser outlet pressure P11;
s16, the air conditioner obtains the condenser supercooling degree T0 according to the refrigerant saturation temperature T13 and the condenser outlet temperature T12, and the count value of the counter is controlled to be increased by 1;
s17, judging whether the supercooling degree T0 of the condenser is smaller than a second preset value or not by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S18;
s18, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, return to step S14; otherwise, go to step S19;
s19, operating the air conditioner according to a preset mode;
s20, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S13; otherwise, returning to step S19;
wherein f1 is more than f0, and f2 is less than f 0.
9. The method as claimed in claim 8, wherein the degree of subcooling T0 is the refrigerant saturation temperature T13-the condenser outlet temperature T12.
10. An air conditioner, characterized in that the air conditioner adopts the air conditioner refrigerant leakage detection method as claimed in any one of claims 1 to 9.
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