CN110762743A - 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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- CN110762743A CN110762743A CN201810834336.6A CN201810834336A CN110762743A CN 110762743 A CN110762743 A CN 110762743A CN 201810834336 A CN201810834336 A CN 201810834336A CN 110762743 A CN110762743 A CN 110762743A
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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
- F24F11/64—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
- F24F11/62—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
- F24F11/88—Electrical aspects, e.g. circuits
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Abstract
The invention provides a method for detecting leakage of air conditioner refrigerant, which comprises the following steps: s1, starting the compressor, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate; s2, judging whether the P11 is smaller than a first preset pressure or not; if yes, refrigerant leakage occurs; otherwise, go to step S3; s3, acquiring relevant information before operation, and acquiring pre-operation frequency according to the relevant information before operation; s4, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency; s5, sampling the pressure of the compressor suction pipe after the compressor suction pipe is operated for a time period t 1; s6, 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; 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; the air conditioner refrigerant leakage detection method effectively improves the accuracy of the air conditioner in 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 leakage of a refrigerant 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 like, so that the refrigerant of the air conditioner leaks. Fundamentally, the refrigerant leakage is reflected in the reduction of the refrigerant flow, the performance of the air conditioner is reduced due to the insufficient refrigerant flow, and the compressor runs under the poor condition, and even the compressor is damaged in the serious condition.
Most of the existing technologies adopt a temperature sensor or a pressure sensor to detect whether the refrigerant leaks, when the refrigerant leakage is detected, the air conditioner sends a protection instruction to stop the whole machine from running, but the air conditioning system is easy to make misjudgment in the process from starting running to running stability or under the working condition of high temperature and high humidity, and the accuracy of the air conditioner in judging the refrigerant leakage is influenced.
The applicant has started research on a technology for preventing leakage of air-conditioning refrigerant in the early stage and filed related patent applications with 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 air-conditioned refrigerant leakage prevention, it is found that the technical solution in the application is also prone to erroneous judgment in the specific implementation process, especially in some specific use environments, and thus the accuracy of judgment on refrigerant leakage by the air conditioner is affected.
Disclosure of Invention
In view of this, 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 that an air conditioning system in the prior art is prone to misjudge refrigerant leakage, and improve the accuracy of judgment of refrigerant leakage by the air conditioner.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner refrigerant leakage detection method includes:
s1, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
s2, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S3;
s3, the air conditioner obtains relevant information before operation, and obtains a pre-operation frequency f0 according to the relevant information before operation;
s4, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s5, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s6, 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; and if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner.
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.
Further, step S6 includes:
s601, 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 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, after the air conditioner continuously operates for t3 time, acquiring the variation △ P12 of the pressure of the suction pipe of the compressor in unit time;
s606, after the air conditioner continues to operate for t4 time, obtaining the variation △ P13 of the pressure of the suction pipe of the compressor in unit time, judging whether a third judgment condition is met between △ P12 and △ P13, if so, the refrigerant leakage occurs, and if not, the air conditioner normally operates.
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 third judgment condition is that the pressure threshold value K is less than | △ P12- △ P13 |;
the first temperature threshold △ T11, the second temperature threshold △ T12 and the pressure threshold K are all preset air conditioner parameters.
Further, the method further comprises:
s607, the air conditioner continues to normally operate;
s608, the air conditioner judges whether the running time reaches a preset time; if yes, go back to step S604; if not, the process returns to step S607.
An air conditioner refrigerant leak detection method, the method comprising:
s01, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
s02, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner obtains an air conditioner preset mode, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, the outdoor temperature T21 before operation and the indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to the frequency f 0;
s05, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s06, 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 S07;
s07, the air conditioner controls the compressor to run at the frequency f1, and f1 is more than or equal to f 0;
s08, 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;
s09, 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 S16, and if yes, performing step S10;
s10, 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;
s11, after the air conditioner continuously runs for a time period of t3, obtaining the variation of the pressure of the compressor suction pipe in unit time;
s12, after the air conditioner continues to operate for a time period of t4, the variable quantity of the pressure of the compressor suction pipe in unit time is obtained again, and the count value of the counter is increased by 1;
s13, calculating the absolute value k of the difference between the two adjacent groups of pressure variation by the air conditioner;
s14, judging whether the absolute value K is smaller than a pressure threshold value K by the air conditioner; if yes, the refrigerant leakage occurs, otherwise, step S16 is performed;
s15, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S16;
s16, normal operation of the air conditioner;
s17, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S10; if not, the process returns to step S16.
Further, in step S07, 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 S10, f2 is m × f0, and f2 is equal to or greater than the minimum compressor operating frequency fmin; wherein m is a preset value, and m is more than 0 and less than 1.
An air conditioner adopts the air conditioner refrigerant leakage detection method.
Further, the air conditioner includes:
the central processing unit is used for processing the related information of the leakage of the air-conditioning refrigerant;
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 memory is connected with the central processing unit and is used for storing the related data of the leakage of the air-conditioning refrigerant;
and the counter is connected with the central processing unit and is used for counting in the detection process.
Compared with the prior art, the air conditioner and the air conditioner refrigerant leakage detection method have the following advantages:
the air conditioner and the air conditioner refrigerant leakage detection method can timely and effectively detect the refrigerant leakage, and meanwhile, the refrigerant leakage is detected by setting the air conditioner pre-operation process, so that the accuracy of judging the refrigerant leakage by the air conditioner is improved, and the occurrence of misjudgment is reduced.
In addition, the air conditioner and the air conditioner refrigerant leakage detection method provided by the invention have the advantages that after the pre-operation of the air conditioner is finished, the high-frequency operation is adjusted, the continuous two-stage judgment is carried out, after the possibility of refrigerant leakage of the air conditioner is judged, the air conditioner is adjusted to be in low-frequency operation, and the third-stage judgment is carried out, so that the interference of some special working conditions on the air conditioner refrigerant leakage detection can be avoided, the accuracy of the air conditioner on the refrigerant leakage judgment 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 conditioners described in the present invention are all referred to as inverter air conditioners.
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, the method is executed by an air conditioner and includes the following steps:
s1, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
after the air conditioner is started, at least before the compressor does not run, the pressure of the suction pipe of the compressor is detected, specifically, the air conditioner detects the pressure of the suction pipe of the compressor through a pressure acquisition device, and the pressure acquisition device can be a pressure sensor or a pressure switch.
S2, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S3;
in the time period from the end of the last operation of the air conditioner to the time before the current operation of the air conditioner, due to the influence of aging factors, human factors, natural factors or certain ineffectiveness, a refrigerant pipeline or related parts of the air conditioner are damaged, so that the refrigerant is leaked; therefore, in step S2 of the method, after the air conditioner is started and at least before the compressor is not operated, the pressure P11 of the compressor suction pipe is analyzed, so that the refrigerant leakage condition which may occur in the non-operation period of the air conditioner can be detected more directly and timely, and the process can improve the detection lag condition existing in the prior art when the refrigerant leakage detection is performed after the air conditioner and the compressor thereof are operated; and if the air conditioner has already had the refrigerant leakage in the non-operation period, if the air conditioner starts the back and directly controls the compressor to operate, will cause certain damage to the compressor, this method is after the air conditioner starts the back, before the compressor operates, leak and detect the refrigerant in time, thus can protect the compressor effectively.
S3, the air conditioner obtains relevant information before operation, and obtains 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.
S4, 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 is kept in the pre-operation frequency f0 for meeting the user's requirement for the air conditioner, and for making the air conditioner enter a stable operation state for the convenience of continuing the detection of refrigerant leakage.
S5, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s6, 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; and if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner.
Wherein the preset value is a preset change value of the pressure of the suction pipe; 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 accuracy that the air conditioner judged to the refrigerant leakage, reduce the emergence of the erroneous judgement condition.
If the air conditioner is analyzed and judged, and the variation or the variation rate of the pressure of the compressor suction pipe in the preset time is not smaller than the preset value, 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 detect the refrigerant leakage condition which may occur in the normal operation stage of the air conditioner in consideration of the change condition of the working frequency of the compressor in the use process of the conventional variable frequency air conditioner, the invention also performs refrigerant leakage detection on the related operation conditions of the air conditioner under different compressor frequencies; as shown in fig. 2, the present invention further extends the process of step S6 and the subsequent steps based on the method for detecting leakage of refrigerant in air conditioner in embodiment 1, and specifically, further describes the process of operating the air conditioner in the preset mode in step S6.
Specifically, the step S6 includes:
s601, 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 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 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 possibly has 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, in order to avoid the damage of the compressor in a high-frequency operation state caused by the possible refrigerant leakage condition, the air conditioner controls the low-frequency operation of the compressor so as to reduce the risk of the damage of the compressor and correspondingly protect the compressor.
S605, after the air conditioner continuously operates for t3 time, acquiring the variation △ P12 of the pressure of the suction pipe of the compressor in unit time;
s606, after the air conditioner continues to operate for t4 time, obtaining the variation △ P13 of the pressure of the suction pipe of the compressor in unit time, judging whether a third judgment condition is met between △ P12 and △ P13, if so, the refrigerant leakage occurs, and if not, the air conditioner normally operates.
The third judgment condition is that | △ P12- △ P13| < a pressure threshold K, and the pressure threshold K is a preset parameter of the air conditioner;
specifically, in the low-frequency operation stage of the air conditioner, the variation of the pressure of the suction pipe of the compressor in unit time is detected and analyzed through steps S605 and S606, and a third-stage judgment is set, so that the refrigerant leakage condition which may have occurred is further analyzed.
In the method, the air conditioner performs continuous two-stage judgment when operating at high frequency, the air conditioner is adjusted to operate at low frequency after judging that the air conditioner possibly has refrigerant leakage, and the third-stage judgment is performed, so that the interference on the air conditioner refrigerant leakage detection under certain special working conditions (such as high-temperature and high-humidity environments) can be avoided, the accuracy of the air conditioner on the refrigerant leakage judgment can be ensured, and the occurrence of misjudgment conditions can be avoided.
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 S606, if the air conditioner is normally operated, the method further comprises:
s607, the air conditioner continues to normally operate;
s608, the air conditioner judges whether the running time reaches a preset time; if yes, go back to step S604; if not, the process returns to step S607.
Therefore, after the air conditioner is started to operate and corresponding refrigerant leakage detection and analysis are carried out, 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 period, the operation returns to the step S604, the refrigerant leakage detection and analysis are carried out on the air conditioner again, 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 therefore the refrigerant leakage which possibly occurs at any time in the use process of the air conditioner can be effectively detected and protected.
Example 3
As shown in fig. 3, in order to further improve the accuracy of the air conditioner in determining the refrigerant leakage, the present invention provides another method for detecting the refrigerant leakage of the air conditioner, which specifically includes:
s01, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
s02, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner obtains an air conditioner preset mode, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, the outdoor temperature T21 before operation and the indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to the frequency f 0;
s05, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s06, 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 S07;
s07, the air conditioner controls the compressor to run at the frequency f1, and 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;
s08, 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;
s09, 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 S16 is carried out, and if all the conditions are met, the step S10 is carried out;
s10, 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; wherein f2 is m × f0, and f2 is not less than the lowest operation frequency fmin of the compressor; wherein m is a preset value, and m is more than 0 and less than 1;
s11, after the air conditioner continuously runs for a time period of t3, obtaining the variation of the pressure of the compressor suction pipe in unit time;
s12, after the air conditioner continues to operate for a time period of t4, the variable quantity of the pressure of the compressor suction pipe in unit time is obtained again, and the count value of the counter is increased by 1;
s13, calculating the absolute value k of the difference between the two adjacent groups of pressure variation by the air conditioner;
s14, judging whether the absolute value K is smaller than a pressure threshold value K by the air conditioner; if yes, the refrigerant leakage occurs, otherwise, step S16 is performed;
s15, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S16;
s16, normal operation of the air conditioner;
s17, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S10; if not, the process returns to step S16.
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 processes, 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
The embodiment proposes an air conditioner, and adopts the air conditioner refrigerant leakage detection method proposed in any one of embodiments 1 to 3. Specifically, the air conditioner includes:
the central processing unit is used for processing the related information of the air conditioner refrigerant leakage, including analyzing and processing the related data, sending corresponding control instructions to related components 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 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 is used for storing the related data of the air conditioner refrigerant leakage.
The related data stored in the memory at least comprises data related to an air conditioner operation mode, a first preset pressure P21, a preset operation frequency, a corresponding relation between each preset operation frequency and different air conditioner related parameters, a preset change value of the suction pipe pressure, a first temperature threshold value △ T11, a second temperature threshold value △ T12, a preset value n, a preset value m, a pressure threshold value K, a preset numerical value of a counter, a corresponding preset time length 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.
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. An air conditioner refrigerant leakage detection method is characterized by comprising the following steps:
s1, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
s2, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S3;
s3, the air conditioner obtains relevant information before operation, and obtains a pre-operation frequency f0 according to the relevant information before operation;
s4, pre-running the air conditioner, and controlling the compressor to run according to the pre-running frequency f 0;
s5, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s6, 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; and if not, the air conditioner finishes the pre-operation and operates according to the pre-set mode of the air conditioner.
2. The method of claim 1, wherein the pre-operation related information includes an air conditioner preset mode, a pre-operation outdoor temperature T21, a pre-operation indoor temperature T22, a pre-operation indoor unit coil temperature T11;
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.
3. The air conditioner refrigerant leakage detecting method as claimed in claim 1, wherein the step S6 includes:
s601, 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 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, after the air conditioner continuously operates for t3 time, acquiring the variation △ P12 of the pressure of the suction pipe of the compressor in unit time;
s606, after the air conditioner continues to operate for t4 time, obtaining the variation △ P13 of the pressure of the suction pipe of the compressor in unit time, judging whether a third judgment condition is met between △ P12 and △ P13, if so, the refrigerant leakage occurs, and if not, the air conditioner normally operates.
4. A refrigerant leakage detecting method of an air conditioner according to claim 3, wherein in step S602, f1 ═ n ═ f0, and f1 ≦ 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.
5. A refrigerant leakage detecting method of an air conditioner according to claim 3, wherein the first judging 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 third judgment condition is that the pressure threshold value K is less than | △ P12- △ P13 |;
the first temperature threshold △ T11, the second temperature threshold △ T12 and the pressure threshold K are all preset air conditioner parameters.
6. A method of detecting refrigerant leakage from an air conditioner according to claim 3, further comprising:
s607, the air conditioner continues to normally operate;
s608, the air conditioner judges whether the running time reaches a preset time; if yes, go back to step S604; if not, the process returns to step S607.
7. An air conditioner refrigerant leak detection method, characterized in that the method comprises:
s01, starting the air conditioner, and acquiring the pressure P11 of the air suction pipe when the compressor does not operate;
s02, the air conditioner judges whether the pressure P11 of the air suction pipe is smaller than a first preset pressure P21; if yes, refrigerant leakage occurs; otherwise, go to step S03;
s03, the air conditioner obtains an air conditioner preset mode, the outdoor temperature T21 before operation, the indoor temperature T22 before operation and the indoor unit coil temperature T11 before operation;
s04, the air conditioner obtains a pre-operation frequency f0 according to a pre-set mode of the air conditioner, the outdoor temperature T21 before operation and the indoor temperature T22 before operation, the air conditioner operates in advance, and the compressor is controlled to operate according to the frequency f 0;
s05, sampling the pressure of the suction pipe of the compressor after the air conditioner runs for a time t1 in advance;
s06, 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 S07;
s07, the air conditioner controls the compressor to run at the frequency f1, and f1 is more than or equal to f 0;
s08, 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;
s09, 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 S16, and if yes, performing step S10;
s10, 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;
s11, after the air conditioner continuously runs for a time period of t3, obtaining the variation of the pressure of the compressor suction pipe in unit time;
s12, after the air conditioner continues to operate for a time period of t4, the variable quantity of the pressure of the compressor suction pipe in unit time is obtained again, and the count value of the counter is increased by 1;
s13, calculating the absolute value k of the difference between the two adjacent groups of pressure variation by the air conditioner;
s14, judging whether the absolute value K is smaller than a pressure threshold value K by the air conditioner; if yes, the refrigerant leakage occurs, otherwise, step S16 is performed;
s15, judging whether the count value of the counter is smaller than a preset value by the air conditioner; if yes, the process returns to step S12, otherwise, the process goes to step S16;
s16, normal operation of the air conditioner;
s17, judging whether the operation time length reaches a preset time length by the air conditioner; if yes, return to step S10; if not, the process returns to step S16.
8. The method of claim 7, wherein in step S07, f1 ═ n × f0, and f1 ≦ maximum compressor operating frequency fmax; wherein n is a preset value and is more than or equal to 1;
in step S10, f2 is m × f0, and f2 is equal to or greater than the minimum compressor operating frequency fmin; wherein m is a preset value, and m is more than 0 and less than 1.
9. An air conditioner characterized in that the air conditioner employs an air conditioner refrigerant leakage detection method as set forth in any one of claims 1 to 8.
10. An air conditioner according to claim 9, wherein the air conditioner comprises:
the central processing unit is used for processing the related information of the leakage of the air-conditioning refrigerant;
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 memory is connected with the central processing unit and is used for storing the related data of the leakage of the air-conditioning refrigerant;
and the counter is connected with the central processing unit and is used for counting in the detection process.
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