CN110762785A - 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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- CN110762785A CN110762785A CN201810833657.4A CN201810833657A CN110762785A CN 110762785 A CN110762785 A CN 110762785A CN 201810833657 A CN201810833657 A CN 201810833657A CN 110762785 A CN110762785 A CN 110762785A
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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
- F24F11/30—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
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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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
- F24F11/65—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
- F24F11/70—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
- F24F11/89—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
- F24F2110/10—Temperature
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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
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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Abstract
The invention provides an air conditioner and a method for detecting refrigerant leakage of the air conditioner, wherein the method comprises the following steps: s1, starting the computer, acquiring relevant information before operation, and acquiring pre-operation frequency 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; s3, obtaining the pressure P11 of the suction pipe of the compressor after the pre-operation time of t 1; s4, judging whether the P11 is less than or equal to a preset pressure value by the air conditioner; if yes, the refrigerant leakage occurs, otherwise, step S5 is performed; s5, obtaining the concentration percentage of each component of the refrigerant in the air suction pipe of the compressor; s6, judging whether the concentration percentages of the components of the refrigerant are within a preset value range; if yes, refrigerant leakage occurs; and if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner. The method for detecting the refrigerant leakage of the air conditioner effectively improves the accuracy of the air conditioner for detecting the refrigerant leakage 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.
The prior art mostly adopts a temperature sensor or a pressure sensor to detect whether a refrigerant leaks or not, when the refrigerant leakage is detected, an air conditioner sends a protection instruction to stop the whole machine to run, but the air conditioning system is easy to make misjudgment during the process from the beginning to the stable running process or under the working condition that the air conditioner is in high temperature and high humidity, and the accuracy of the air conditioner in judging the refrigerant leakage 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 an air conditioner and a method for detecting refrigerant leakage of the air conditioner, so as to solve the problem in the prior art that an air conditioning system is prone to misjudgment when refrigerant leaks, 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:
a method for detecting the leakage of refrigerant in air conditioner includes:
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, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s4, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
s5, the air conditioner obtains the concentration percentage of each component of the refrigerant in the air suction pipe of the compressor;
s6, judging whether the concentration percentages of the components of the refrigerant are in a preset value range by the air conditioner; if yes, refrigerant leakage occurs; if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner;
wherein the refrigerant comprises at least two components.
Further, the related information before operation includes an air conditioner preset mode, an outdoor temperature T21 before operation, an indoor temperature T22 before operation, and an indoor unit coil temperature T11 before operation;
the air conditioner preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user;
the refrigerant comprises pentafluoroethane, trifluoroethane and tetrafluoroethane.
Further, step S5 includes:
s501, the air conditioner acquires wavelength data of each component of a refrigerant in an air suction pipe through an infrared sensor in the air suction pipe of the compressor;
and S502, the air conditioner acquires the concentration percentage of each component according to the wavelength data of each component.
Further, step S6 includes:
s601, judging whether the concentration percentages of all the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S602;
s602, the air conditioner controls the compressor to run at the frequency f1, wherein f1 is more than or equal to f 0;
s603, after the air conditioner continuously runs for a time period of T2, acquiring the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe, and judging whether a first judgment condition is met between T11 and T12 and whether a second judgment condition is met between T11 and T13; if any condition is not met, the air conditioner normally operates, and if the judgment conditions are met, the step S604 is carried out;
s604, controlling the compressor to run at a frequency f2, wherein f2 is more than f0 by the air conditioner;
s605, sampling the pressure of the suction pipe of the compressor after the air conditioner continuously operates for t3 time; judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value or not; if yes, refrigerant leakage occurs; otherwise, the air conditioner operates normally.
Further, in step S602, f1 is n × f0, and f1 is not greater than the maximum compressor operating frequency fmax; wherein n is a preset value and is more than or equal to 1;
in step S604, f2 ═ m × f0, and f2 is equal to or greater than the compressor minimum operating frequency fmin; wherein m is a preset value, and m is more than 0 and less than 1.
Further, the first judgment condition is | T11-T12| < the first temperature threshold △ T11;
the second judgment condition is that T13-T11 is larger than a second temperature threshold △ T12;
the first temperature threshold △ T11 and the second temperature threshold △ T12 are both air conditioner preset parameters.
Further, the method further comprises:
s606, the air conditioner continues to normally operate;
s607, the air conditioner judges whether the operation time length reaches the preset time length; if yes, go back to step S604; if not, the process returns to step S606.
A method for detecting refrigerant leakage of an air conditioner comprises the following steps:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, an outdoor temperature T21 before operation and an indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to f 0;
s03, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s04, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S05 is performed;
s05, the air conditioner acquires wavelength data of each component contained in a refrigerant in the air suction pipe through an infrared sensor in the air suction pipe of the compressor;
s06, the air conditioner obtains the concentration percentage of each component according to the wavelength data of each component;
s07, judging whether the concentration percentages of the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S08;
s08, the air conditioner controls the compressor to run at the frequency f1, and f1 is more than or equal to f 0;
s09, after the air conditioner continuously runs for a time period of T2, obtaining the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe;
s10, judging whether | T11-T12| < a first temperature threshold △ T11 and T13-T11 > a second temperature threshold △ T12 or not by the air conditioner, if not, performing step S15, and if yes, performing step S11;
s11, the air conditioner control counter returns to zero, and the compressor is controlled to run at the frequency f2, wherein f2 is more than f 0;
s12, after the air conditioner continuously runs for a time period of t3, sampling the pressure of the suction pipe of the compressor, and adding 1 to the count value of the counter;
s13, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S14;
s14, judging whether the count value of the counter is smaller than the rated value or not by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S15;
s15, normal operation of the air conditioner;
s16, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S11; if not, the process returns to step S15.
Further, after refrigerant leakage occurs, the air conditioner detects the concentration C of the refrigerant outside the refrigerant pipeline through a refrigerant detector;
when C is less than or equal to a first preset concentration C1, judging that first-level leakage occurs, and flashing an alarm indicator light;
when the first preset concentration C1 is more than C and less than the second preset concentration C2, judging that secondary leakage occurs, starting an audible and visual alarm device, and controlling the compressor to operate at the lowest operation frequency;
and when the concentration C is larger than or equal to a second preset concentration C2, judging that three-stage leakage occurs, starting an audible and visual alarm device, and stopping the compressor.
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 method for detecting the refrigerant leakage of the air conditioner, the pre-operation process of the air conditioner is set, and the refrigerant leakage is detected and analyzed in two stages in the pre-operation process stage, so that the accuracy of the air conditioner in judging 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, perform continuous two-stage detection analysis, adjust the air conditioner to be in low-frequency operation after the possibility of refrigerant leakage of the air conditioner is judged, perform third-stage judgment, avoid the interference of certain special working conditions on the refrigerant leakage detection of the air conditioner, further improve the accuracy of the air conditioner on the refrigerant leakage judgment, and avoid the occurrence of misjudgment.
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 refrigerant includes at least two components, 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 an air conditioner preset mode, an outdoor temperature T21 before operation, an indoor temperature T22 before operation and an indoor unit coil temperature T11 before operation; wherein, the air conditioner detects each item temperature parameter respectively through setting up a plurality of temperature sensor.
The air conditioner 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 of the air conditioner is the operation mode set by the user; if the user does not set the operation mode, the preset mode of the air conditioner is the operation mode of the air conditioner before the last shutdown;
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 air conditioner preset modes, data of outdoor temperature T21 before operation, indoor temperature T22 before operation, coil temperature T11 before operation and the like) in an air conditioner data storage device;
the air conditioner retrieves a corresponding pre-operation frequency f0 from an air conditioner data storage device according to at least two data information of an air conditioner preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22 and a pre-operation indoor unit coil temperature T11; preferably, the air conditioner acquires a corresponding pre-operation frequency f0 from the air conditioner data storage device according to three data information, namely an air conditioner 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 air conditioner is used for meeting the use requirement of a user on the air conditioner, and on the other hand, the air conditioner is in a stable operation state, so that the refrigerant leakage detection can be continued conveniently.
S3, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
the air conditioner detects the pressure of a compressor suction pipe through a pressure acquisition device, and the pressure acquisition device can be a pressure sensor or a pressure switch.
S4, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
through setting up the air conditioner operation process in advance to after the air conditioner operation is carried out steadily in advance, detect and judge the analysis through pressure acquisition device to compressor suction pipe pressure, thereby be favorable to improving the accuracy that the air conditioner was judged refrigerant leakage, reduce the emergence of the erroneous judgement condition.
S5, the air conditioner obtains the concentration percentage of each component of the refrigerant in the air suction pipe of the compressor;
the refrigerant comprises at least two components, preferably, the refrigerant is refrigerant R404A, and comprises pentafluoroethane, trifluoroethane and tetrafluoroethane;
after the air conditioner detects, judges and analyzes the pressure of the air suction pipe, in order to avoid the condition of error judgment, the air conditioner continues to detect the concentration percentage of each component of the refrigerant in the air suction pipe; specifically, the concentration of each component of the refrigerant can be detected by arranging a corresponding concentration sensor in the air suction pipe, and corresponding concentration percentage data can be obtained; the wavelength data of each component of the refrigerant can be detected by arranging a corresponding infrared sensor in the air suction pipe, then the air conditioner acquires concentration percentage data corresponding to the wavelength data from the air conditioner data storage device according to the wavelength data, and meanwhile, before the air conditioner leaves a factory, an air conditioner manufacturer presets a plurality of groups of wavelength data and corresponding concentration percentage data in the air conditioner data storage device.
S6, judging whether the concentration percentages of the components of the refrigerant are in a preset value range by the air conditioner; if yes, refrigerant leakage occurs; if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner
If the air conditioner is analyzed and judged, the concentration percentages of all components of the refrigerant in the air suction pipe of the compressor are within a preset numerical range, and then refrigerant leakage occurs; if the concentration percentage of at least one component is not within the preset numerical range, the air conditioner finishes the preset operation and operates according to the preset mode of the air conditioner; similarly, the preset air conditioner 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 of the air conditioner is the operation mode set by the user; and if the user does not set the operation mode, the preset mode of the air conditioner is the operation mode of the air conditioner before the last shutdown.
Example 2
In order to further ensure the accuracy of refrigerant leakage detection, as shown in fig. 2, the present invention further describes the process of obtaining the concentration percentage of each component by the air conditioner based on the refrigerant leakage detection method of the air conditioner described in embodiment 1, and specifically further describes step S5.
Specifically, the step S5 includes:
s501, the air conditioner acquires wavelength data of each component of a refrigerant in an air suction pipe through an infrared sensor in the air suction pipe of the compressor;
specifically, the refrigerant is a refrigerant R404A, and comprises pentafluoroethane, trifluoroethane and tetrafluoroethane, wherein preferably, the concentration percentage of pentafluoroethane is 5% -30%, the concentration percentage of trifluoroethane is 40% -60%, and the concentration percentage of tetrafluoroethane is 20% -35%;
an infrared sensor is arranged in a compressor air suction pipe, wherein the infrared sensor is a gas infrared sensor and can acquire wavelength data of different gas components; the air conditioner monitors the wavelength data of each component of the refrigerant in real time through an infrared sensor.
And S502, the air conditioner acquires the concentration percentage of each component according to the wavelength data of each component.
Specifically, the air conditioner acquires concentration percentage data corresponding to the wavelength data from an air conditioner data storage device according to the wavelength data, and meanwhile, before the air conditioner leaves a factory, an air conditioner manufacturer presets a plurality of groups of wavelength data and corresponding concentration percentage data in the air conditioner data storage device.
Subsequently, step S6 is performed: judging whether the concentration percentages of the components of the refrigerant are within a preset numerical range; the specific numerical value corresponding to the corresponding preset numerical value range is also stored in the air conditioner data storage device in advance, preferably, the preset numerical value range corresponding to pentafluoroethane is 5% -30%, the preset numerical value range corresponding to trifluoroethane is 40% -60%, and the preset numerical value range corresponding to tetrafluoroethane is 20% -35%;
the air conditioner acquires concentration percentage data according to the wavelength data, compares the concentration percentage data of each component with a preset numerical range, and determines that the refrigerant leaks when the concentration percentage of each component is within the preset numerical range, so that the refrigerant leakage can be continuously and accurately detected in real time, and the occurrence of misjudgment is reduced.
In addition, after the step S6, in order to detect the refrigerant leakage condition that may occur during the normal operation of the air conditioner in consideration of the change condition of the compressor operating frequency during the use of the conventional variable frequency air conditioner, researchers of the present application also perform refrigerant leakage detection on the air conditioner related operation conditions at different compressor frequencies; as shown in fig. 2, the present invention further expands the step S6 and subsequent processes based on the method for detecting refrigerant leakage of an air conditioner in embodiment 1, and specifically, further describes the process of operating the air conditioner in the preset mode in step S6.
Specifically, step S6 includes:
s601, judging whether the concentration percentages of all the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S602;
s602, the air conditioner controls the compressor to run at the frequency f1, wherein f1 is more than or equal to f 0;
wherein, f1 is n f0, and f1 is not more than the highest running frequency fmax of the compressor; n is a preset value and is more than or equal to 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.
S603, after the air conditioner continuously runs for a time period of T2, acquiring the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe, and judging whether a first judgment condition is met between T11 and T12 and whether a second judgment condition is met between T11 and T13; if any condition is not met, the air conditioner normally operates, and if the judgment conditions are met, the step S604 is carried out;
the first judgment condition is that the absolute value of T11-T12 is less than a first temperature threshold value △ T11, the second judgment condition is that the absolute value of T13-T11 is greater than a second temperature threshold value △ T12, and the first temperature threshold value △ T11 and the second temperature threshold value △ T12 are air conditioner preset parameters.
In the use process of the air conditioner, if a refrigerant leakage condition occurs, the total amount of the refrigerant in a refrigerant pipeline is reduced, on one hand, the change amplitude of the temperature of an indoor unit coil pipe is smaller than the temperature change amplitude when the refrigerant is not leaked, namely, the heating or refrigerating effect of the air conditioner is poor, on the other hand, the refrigerant leakage enables the heat exchange of the refrigerant to be sufficient, so that the refrigerant at the air suction pipe of the compressor is subjected to excessive heat exchange, the temperature T13 of the air suction pipe of the compressor is too high, namely the temperature of the air suction pipe of the compressor when the refrigerant is leaked is higher than the temperature of the air suction pipe when the refrigerant is not leaked, and the condition that T13-T11 is larger than a second temperature threshold △ T12 is caused by setting a preset value of a second.
The process detects the temperature T12 of the coil pipe of the indoor unit and the temperature T13 of the air suction pipe of the compressor in real time, and detects and analyzes the refrigerant leakage condition of the air conditioner in a high-frequency operation stage by setting continuous two-stage judgment conditions by combining the temperature T11 of the coil pipe of the indoor unit before operation, thereby being beneficial to improving the accuracy of the air conditioner in judging the refrigerant leakage; in addition, when any judgment condition is not met, the air conditioner operates according to a normal operation program, if the two-stage judgment condition is not met, the air conditioner is indicated to have refrigerant leakage, and a next analysis process is required, so that the accuracy of the air conditioner in judging the refrigerant leakage is further improved in the air conditioner operation stage.
S604, controlling the compressor to run at a frequency f2, wherein f2 is more than f0 by the air conditioner;
wherein 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, 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.
S605, sampling the pressure of the suction pipe of the compressor after the air conditioner continuously operates for t3 time; judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value or not; if yes, refrigerant leakage occurs; otherwise, the air conditioner operates normally.
Wherein the preset value is a preset change value of the pressure of the suction pipe; the air conditioner is in the low frequency operation stage to after the air conditioner operates steadily, sample to compressor suction pipe pressure through pressure collection device, judge the change volume or the rate of change of suction pipe pressure in the time of predetermineeing, carry out the third grade and judge promptly, further analysis to the refrigerant leakage condition that probably has taken place, thereby be favorable to improving the accuracy that the air conditioner judged refrigerant leakage, reduce the emergence of the erroneous judgement condition.
By further detecting the refrigerant leakage of the air conditioner in the step S6 in the preset mode, that is, performing continuous two-stage judgment when the air conditioner is operating at a high frequency, adjusting the air conditioner to operate at a low frequency after judging that the air conditioner may have refrigerant leakage, and performing a third-stage judgment, the interference of the air conditioner on the refrigerant leakage detection under some special conditions (such as a high-temperature and high-humidity environment) can be avoided, which is beneficial to ensuring the accuracy of the air conditioner on the refrigerant leakage judgment and avoiding the occurrence of misjudgment.
On the basis of the method, in order to ensure that the air conditioner can regularly detect the refrigerant leakage in the normal operation process, after the judgment in step S603 or step S605, if the air conditioner is normally operated, the method further includes:
s606, the air conditioner continues to normally operate;
s607, the air conditioner judges whether the operation time length reaches the preset time length; if yes, go back to step S604; if not, the process returns to step S606.
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 normal operation program, and after the operation reaches a preset time, the operation returns to the step S604, 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 3
As shown in fig. 3, in order to further improve the accuracy of the air conditioner in determining refrigerant leakage, the present invention provides another method for detecting refrigerant leakage of an air conditioner, which specifically includes:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, an outdoor temperature T21 before operation and an indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to f 0;
s03, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s04, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S05 is performed;
s05, the air conditioner acquires wavelength data of each component contained in a refrigerant in the air suction pipe through an infrared sensor in the air suction pipe of the compressor;
s06, the air conditioner obtains the concentration percentage of each component according to the wavelength data of each component;
s07, judging whether the concentration percentages of the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S08;
s08, the air conditioner controls the compressor to run at the frequency f1, and f1 is more than or equal to f 0;
s09, after the air conditioner continuously runs for a time period of T2, obtaining the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe;
s10, the air conditioner judges whether | T11-T12| < a first temperature threshold △ T11 and T13-T11 > a second temperature threshold △ T12, if any condition is not met, the step S15 is carried out, and if all the conditions are met, the step S11 is carried out;
s11, the air conditioner control counter returns to zero, and the compressor is controlled to run at the frequency f2, wherein f2 is more than f 0;
s12, after the air conditioner continuously runs for a time period of t3, sampling the pressure of the suction pipe of the compressor, and adding 1 to the count value of the counter;
s13, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S14;
s14, judging whether the count value of the counter is smaller than the rated value or not by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S15;
s15, normal operation of the air conditioner;
s16, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S11; if not, the process returns to step S15.
In the method, in the refrigerant leakage detection and analysis process of the air conditioner low-frequency operation stage, the counting process is set, and the air conditioner low-frequency operation stage is subjected to multiple detection and processing, so that the accuracy of judgment of refrigerant leakage by the air conditioner is further improved, the occurrence of misjudgment is avoided, the air conditioner is controlled to perform multiple refrigerant leakage detection and analysis in the low-frequency stage, the consumption of the air conditioner on electric energy can be effectively reduced, and the compressor is protected to a certain extent.
Example 4
Because there may be corresponding potential safety hazard after the refrigerant leakage occurs, in order that the air conditioner can timely and effectively process the refrigerant leakage after the refrigerant leakage occurs, the present embodiment performs classification processing on the refrigerant leakage condition after determining that the refrigerant leakage occurs on the basis of any one of the methods in the embodiments 1 to 3; the method specifically comprises the following steps:
after refrigerant leakage occurs, the air conditioner detects the concentration C of the refrigerant outside the refrigerant pipeline through a refrigerant detector;
the air conditioner is provided with at least two refrigerant detectors which are respectively connected with the indoor unit shell and the outdoor unit shell, and the concentration of the refrigerant leaked out of the refrigerant pipeline is detected by the refrigerant detectors.
The air conditioner judges whether the refrigerant concentration C is less than or equal to a first preset concentration C1;
if yes, judging that first-level leakage occurs, and flashing an alarm indicator light;
if not, the air conditioner continuously judges whether the refrigerant concentration C is larger than or equal to a second preset concentration C2; if yes, judging that three-stage leakage occurs, starting the sound and light alarm device, stopping the compressor, otherwise, judging that two-stage leakage occurs, starting the sound and light alarm device, and controlling the compressor to operate at the lowest operation frequency.
Refrigerant leakage is classified, the concentration of the refrigerant leaked to the external environment of a refrigerant pipeline is detected, when the concentration C of the refrigerant is less than or equal to a first preset concentration C1, trace refrigerant leakage is indicated, the operation of the air conditioner is maintained, meanwhile, an alarm indicator lamp flickers to remind a user of refrigerant leakage, and the use of the air conditioner of the user cannot be influenced;
when the first preset concentration C1 is greater than the refrigerant concentration C and is less than the second preset concentration C2, the refrigerant is indicated to be leaked in a small amount, the audible and visual alarm device is started, the compressor is controlled to run at the lowest running frequency, and the compressor is regulated to run at the lowest running frequency on the premise of meeting the use requirement of a user on the air conditioner so as to be protected to a certain extent; the sound and light alarm device comprises an alarm indicator light and a loudspeaker and is used for reminding a user of refrigerant leakage;
when the concentration C of the refrigerant is larger than or equal to a second preset concentration C2, the refrigerant is indicated to be leaked in a large amount, and in order to avoid damage to the compressor, the compressor is stopped while the sound-light alarm device is started.
Example 5
The present embodiment provides an air conditioner, and the method for detecting refrigerant leakage of an air conditioner according to any one of embodiments 1 to 4 is adopted. 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 the related data, sending corresponding control instructions to related parts of the air conditioner and the like;
the first temperature sensor is arranged on the air suction pipe of the compressor, connected with the central processing unit and used for acquiring the temperature of the air suction pipe;
the 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 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 coil pipe of the indoor unit, is connected with the central processing unit and is used for acquiring the temperature of the coil pipe of the indoor unit;
the fourth 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 infrared sensor is arranged on the air suction pipe of the compressor, connected with the central processing unit and used for acquiring wavelength data of each component of the refrigerant;
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 refrigerant leakage of the air conditioner.
The related data stored in the memory at least comprises data related to an air conditioner operation mode, a preset pressure value of the air suction pipe, a preset operation frequency, a corresponding relation between each preset operation frequency and different air conditioner related parameters, a preset numerical range of concentration percentage of each component, concentration percentage data, a corresponding relation between wavelength data of each component and concentration percentage, a preset change value of the air suction pipe pressure, a first temperature threshold value △ T11, a second temperature threshold value △ T12, a preset value n, a preset value m, a rated value corresponding to a counter, each preset duration, a first preset concentration C1 and a second preset concentration C2.
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 described 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.
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 refrigerant leakage 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, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s4, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S5 is performed;
s5, the air conditioner obtains the concentration percentage of each component of the refrigerant in the air suction pipe of the compressor;
s6, judging whether the concentration percentages of the components of the refrigerant are in a preset value range by the air conditioner; if yes, refrigerant leakage occurs; if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner;
wherein the refrigerant comprises at least two components.
2. The method as claimed in claim 1, wherein the information related to the air conditioner before operation includes a preset mode of the air conditioner, a temperature T21 before operation, a temperature T22 before operation, a temperature T11 of a coil of the indoor unit before operation;
the air conditioner preset mode comprises an operation mode before the last shutdown of the air conditioner and an operation mode set by a user;
the refrigerant comprises pentafluoroethane, trifluoroethane and tetrafluoroethane.
3. The method as claimed in claim 1, wherein the step S5 includes:
s501, the air conditioner acquires wavelength data of each component of a refrigerant in an air suction pipe through an infrared sensor in the air suction pipe of the compressor;
and S502, the air conditioner acquires the concentration percentage of each component according to the wavelength data of each component.
4. The method as claimed in claim 1, wherein the step S6 includes:
s601, judging whether the concentration percentages of all the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S602;
s602, the air conditioner controls the compressor to run at the frequency f1, wherein f1 is more than or equal to f 0;
s603, after the air conditioner continuously runs for a time period of T2, acquiring the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe, and judging whether a first judgment condition is met between T11 and T12 and whether a second judgment condition is met between T11 and T13; if any condition is not met, the air conditioner normally operates, and if the judgment conditions are met, the step S604 is carried out;
s604, controlling the compressor to run at a frequency f2, wherein f2 is more than f0 by the air conditioner;
s605, sampling the pressure of the suction pipe of the compressor after the air conditioner continuously operates for t3 time; judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value or not; if yes, refrigerant leakage occurs; otherwise, the air conditioner operates normally.
5. The method as claimed in claim 4, wherein in step S602, f1 is n f0, and f1 is equal to or less than the maximum operating frequency fmax of the compressor; wherein n is a preset value and is more than or equal to 1;
in step S604, f2 ═ m × f0, and f2 is equal to or greater than the compressor minimum operating frequency fmin; wherein m is a preset value, and m is more than 0 and less than 1.
6. The method as claimed in claim 4, wherein the first determination condition is | T11-T12| < the first temperature threshold △ T11;
the second judgment condition is that T13-T11 is larger than a second temperature threshold △ T12;
the first temperature threshold △ T11 and the second temperature threshold △ T12 are both air conditioner preset parameters.
7. The method as claimed in claim 4, further comprising:
s606, the air conditioner continues to normally operate;
s607, the air conditioner judges whether the operation time length reaches the preset time length; if yes, go back to step S604; if not, the process returns to step S606.
8. A method for detecting refrigerant leakage of an air conditioner is characterized by comprising the following steps:
s01, starting the air conditioner, and acquiring a preset mode of the air conditioner, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s02, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, an outdoor temperature T21 before operation and an indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to f 0;
s03, obtaining the pressure P11 of the air suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s04, judging whether the pressure P11 of the air suction pipe of the compressor is less than or equal to a preset pressure value by the air conditioner; if yes, refrigerant leakage occurs, otherwise, step S05 is performed;
s05, the air conditioner acquires wavelength data of each component contained in a refrigerant in the air suction pipe through an infrared sensor in the air suction pipe of the compressor;
s06, the air conditioner obtains the concentration percentage of each component according to the wavelength data of each component;
s07, judging whether the concentration percentages of the components of the refrigerant are within a preset numerical range by the air conditioner, if so, leaking the refrigerant; otherwise, go to step S08;
s08, the air conditioner controls the compressor to run at the frequency f1, and f1 is more than or equal to f 0;
s09, after the air conditioner continuously runs for a time period of T2, obtaining the temperature T12 of an indoor unit coil pipe and the temperature T13 of a compressor suction pipe;
s10, judging whether | T11-T12| < a first temperature threshold △ T11 and T13-T11 > a second temperature threshold △ T12 or not by the air conditioner, if not, performing step S15, and if yes, performing step S11;
s11, the air conditioner control counter returns to zero, and the compressor is controlled to run at the frequency f2, wherein f2 is more than f 0;
s12, after the air conditioner continuously runs for a time period of t3, sampling the pressure of the suction pipe of the compressor, and adding 1 to the count value of the counter;
s13, judging whether the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is smaller than a preset value by the air conditioner; if yes, refrigerant leakage occurs; otherwise, go to step S14;
s14, judging whether the count value of the counter is smaller than the rated value or not by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S15;
s15, normal operation of the air conditioner;
s16, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S11; if not, the process returns to step S15.
9. The method for detecting refrigerant leakage of an air conditioner as claimed in any one of claims 1 to 8, wherein after refrigerant leakage occurs, the air conditioner detects the concentration C of refrigerant outside the refrigerant pipeline by a refrigerant detector;
when C is less than or equal to a first preset concentration C1, judging that first-level leakage occurs, and flashing an alarm indicator light;
when the first preset concentration C1 is more than C and less than the second preset concentration C2, judging that secondary leakage occurs, starting an audible and visual alarm device, and controlling the compressor to operate at the lowest operation frequency;
and when the concentration C is larger than or equal to a second preset concentration C2, judging that three-stage leakage occurs, starting an audible and visual alarm device, and stopping the compressor.
10. An air conditioner, characterized in that the air conditioner adopts the method for detecting the refrigerant leakage of the air conditioner as claimed in any one of claims 1 to 9.
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| CN113531772A (en) * | 2021-07-13 | 2021-10-22 | 珠海拓芯科技有限公司 | Combustible refrigerant leakage protection method and device, air conditioner and storage medium |
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