CN110895020A - Refrigerant leakage detection method and air conditioner - Google Patents
Refrigerant leakage detection method and air conditioner Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F24F11/64—Electronic processing using pre-stored data
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Abstract
The invention provides a refrigerant leakage detection method, which comprises the following steps: s1, when the operation of the air conditioner is stable, the control system enters a refrigerant leakage judging program; s2, executing a refrigerant leakage judging program, and judging that refrigerant leakage occurs when the real-time exhaust temperature and the theoretical exhaust temperature of the compressor meet a first preset condition and the temperature difference between the indoor temperature and the refrigerant temperature at the outlet of the evaporator meets a second preset condition; s3, executing the refrigerant leakage verification program; and S4, executing a refrigerant leakage amount judging program, and judging the influence of the refrigerant leakage amount on the operation of the compressor according to whether the return air temperature of the compressor is in a preset temperature range. The refrigerant leakage detection method can accurately judge whether the refrigerant leakage occurs or not, and can also accurately judge whether the refrigerant needs to be supplemented or not after the refrigerant leakage is judged, thereby facilitating the maintenance of the air conditioner and the filling of the refrigerant by a user or a maintenance worker.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage detection method and an air conditioner.
Background
Existing air conditioning refrigeration systems include a compressor, an outdoor heat exchanger, a throttle, an indoor heat exchanger, and a pre-charge of a quantity of refrigerant, among others. And under the condition that the refrigerant is not leaked, the air conditioning system can normally perform refrigeration operation. If the air conditioner is not installed normally or the refrigerant leaks slowly for a long time in the system pipeline due to vibration and other reasons during later operation, the refrigeration effect of the air conditioning system is deteriorated. When refrigerant leakage is severe, the compressor is often burned out. Therefore, it is necessary to detect the leakage of the refrigerant in the air conditioner. When the air conditioner in the prior art judges the refrigerant leakage, the judging method is simple, the detected data parameters are single, and the phenomenon of misjudgment is easy to occur.
Disclosure of Invention
In view of this, the present invention is directed to a refrigerant leakage detection method, so as to solve the problems that, when an air conditioner performs refrigerant leakage determination in the prior art, the determination method is simple, the detected data parameter is single, and erroneous determination is likely to occur.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a refrigerant leak detection method comprising the steps of:
s1, detecting the current running state of the air conditioner, and when the running of the air conditioner is stable, the control system enters a refrigerant leakage judging program;
s2, executing a refrigerant leakage judging program, and judging that refrigerant leakage occurs when the real-time exhaust temperature of the compressor meets a first preset condition and the temperature difference between the indoor temperature and the refrigerant temperature at the outlet of the evaporator meets a second preset condition;
s3, executing the refrigerant leakage verification program;
and S4, executing a refrigerant leakage amount judging program, and judging the refrigerant leakage amount according to whether the return air temperature of the compressor is within a preset temperature range.
Further, the first preset condition is that the ratio of the difference between the real-time exhaust temperature and the theoretical exhaust temperature of the compressor to the theoretical exhaust temperature is greater than a second preset threshold, and the second preset threshold is set to be 0.1-0.2.
Further, the second preset condition is that a rate of change with time of a second temperature difference Te1 between the room temperature T1 and the refrigerant temperature Te at the evaporator outlet is larger than a third preset threshold value set in accordance with a rate of change with time of the second temperature difference Te1 at the standard refrigerant amount.
Further, the S1 includes the following steps:
s11, after the air conditioner is started, the system automatically records the continuous operation time ta of the compressor, judges whether the continuous operation time ta of the compressor reaches a first preset time t1, and executes the step S12 when the continuous operation time ta of the compressor reaches the first preset time t 1;
s12, detecting the indoor temperature T1 and the indoor coil temperature T2, and calculating a first temperature difference value delta T1 between the indoor temperature T1 and the indoor coil temperature T2;
s13, judging whether the first temperature difference value delta T1 is smaller than a first preset threshold value delta T0, if so, executing a step S14, and if not, maintaining the current running state of the compressor;
s14, acquiring the outdoor environment temperature T3, and acquiring a preset maximum compressor frequency value Fr at the temperature;
s15, acquiring the real-time running frequency Fr1 and the real-time exhaust temperature T4 of the compressor;
s16, judging whether the real-time running frequency Fr1 and the real-time exhaust temperature T4 of the compressor meet a third preset condition, if so, executing a step S2; if not, the compressor continues to operate in the current state.
Further, the S2 includes the following steps:
s21, judging whether the ratio of the difference value between the real-time exhaust temperature T4 and the theoretical exhaust temperature to the theoretical exhaust temperature is larger than a second preset threshold value or not, and if yes, executing a step S22; if not, judging that the refrigerant in the air conditioner is not leaked;
s22, acquiring a change curve of the indoor temperature T1 and a change curve of the refrigerant temperature Te at the outlet of the evaporator, and calculating a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator;
s23, judging whether the change rate of a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator along with the time is larger than a third preset threshold value, if so, judging that the refrigerant leaks, and executing a step S3; if not, the compressor continues to operate in the current state.
Further, the third preset condition is that: the compressor real-time discharge temperature T4 is greater than a preset fifth preset threshold Tmax, and the real-time operating frequency Fr1 is less than the compressor maximum frequency value Fr.
Further, the S3 includes:
s31, obtaining the average value of the voltage values, and calculating the time-dependent rate of change of the voltage values;
s32, judging whether the time-dependent change rate R of the voltage exceeds a fourth preset threshold, if so, indicating that a judgment error may occur in the step S2, returning to the step S21, and continuing to judge the refrigerant leakage; if not, executing step S33 for further verification;
s33, detecting the rotating speed of the motor, and calculating the rotating speed N of the compressor corresponding to the rotating speed of the motor;
s34, judging whether the rotating speed N of the compressor is less than the preset reference rotating speed N0, if not, indicating that the misjudgment occurs in the refrigerant leakage judging program, returning to the step S21, and continuing to detect the refrigerant leakage judging program; if yes, it is determined that the leakage of the cooling refrigerant occurs, and step S4 is executed to further determine the amount of refrigerant leakage in the air conditioner and determine whether or not the addition of the refrigerant is necessary.
Further, the S4 includes the following steps:
s41, controlling the compressor to run at the highest frequency and controlling the inner fan to run at the maximum rotating speed;
s42, judging whether the time tb of the highest running frequency of the compressor and the maximum running speed of the inner fan exceeds a second preset time t2, if so, executing the step S43, and if not, continuing running in the current state until the second preset time t2 is reached;
s43, acquiring the return air temperature T5 of the compressor;
s44, judging whether the return air temperature T5 of the compressor is in a preset temperature range, if so, indicating that the leakage of the refrigerant is not serious, and controlling an alarm device to give a secondary alarm prompt by a system, wherein the air conditioner can also run for a period of time; if not, the refrigerant leakage of the air conditioner is serious, the system controls the alarm device to give a first-level alarm prompt and controls the compressor to stop until the refrigerant supplement is finished.
Compared with the prior art, the refrigerant leakage detection method has the following advantages:
(1) the refrigerant leakage detection method can accurately judge whether the refrigerant leakage occurs or not, avoids the influence of factors such as refrigerant pressure, compressor performance and pipeline vibration on the refrigerant leakage judgment process, can also accurately judge whether the refrigerant needs to be supplemented or not after the refrigerant leakage is judged, is convenient for a user or a maintainer to maintain the air conditioner and fill the refrigerant, and improves the user experience.
(2) The refrigerant leakage detection method can not only timely and accurately judge whether the refrigerant in the air conditioner leaks through multi-stage detection verification, further improve the function of the air conditioner, avoid the damage to the air conditioner caused by the refrigerant leakage as much as possible, improve the self-protection capability of the air conditioner, simultaneously avoid the potential safety hazard brought to users by the refrigerant leakage, but also accurately judge the leakage amount of the refrigerant and whether the refrigerant needs to be supplemented after the refrigerant leakage is judged, and is convenient to maintain.
The invention also provides an air conditioner which uses the refrigerant leakage detection method and comprises a compressor, an evaporator, a refrigerant circulating system, a detection system, a timing module and a control system; the detection system and the timing module are connected with the control system, one end of the refrigerant circulating pipeline system is connected with the compressor, and the other end of the refrigerant circulating pipeline system is connected with the evaporator.
Further, the detection system includes a temperature detection system and a rotation speed detector, and the temperature detection system includes:
the first temperature sensor is arranged at an air inlet of the indoor unit and used for detecting indoor temperature;
the second temperature sensor is arranged on the indoor evaporator coil and used for detecting the temperature of the indoor coil;
the third temperature sensor is arranged at the outlet position of the outdoor unit fan and used for detecting the outdoor environment temperature;
the fourth temperature sensor is arranged at the air outlet of the compressor and used for detecting the real-time air exhaust temperature of the compressor;
the fifth temperature sensor is arranged at the refrigerant outlet of the evaporator and used for detecting the temperature of the refrigerant at the outlet of the evaporator;
and the sixth temperature sensor is arranged at the air inlet of the compressor and used for detecting the return air temperature of the compressor.
The rotating speed detector is connected to a motor of the compressor and used for detecting the rotating speed of the motor of the compressor;
the air conditioner has the same advantages as the refrigerant leakage detection method compared with the prior art, and the details are not repeated herein.
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 flow chart of a refrigerant leak detection method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of a refrigerant leak detection method according to a second embodiment of the present invention;
FIG. 3 is a flowchart of a refrigerant leakage amount determination routine in the embodiment of the present invention;
fig. 4 is a graph showing the change of the indoor temperature and the refrigerant temperature at the outlet of the evaporator with time according to the 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. In the embodiments of the present invention, the terms "first", "second", and the like are used for distinguishing identical items or similar items having substantially the same functions or actions, and those skilled in the art will understand that the terms "first", "second", and the like do not limit the quantity or execution order.
In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
Fig. 1 is a refrigerant leak detection method according to an embodiment of the present invention, which specifically includes the following steps:
and S1, detecting the current operation state of the air conditioner, and when the operation of the air conditioner is stable, the control system enters a refrigerant leakage judgment program.
There are many indexes for measuring the operation state of the air conditioner, such as the continuous operation time of the compressor, the difference between the current indoor temperature and the indoor coil temperature, and the outdoor ambient temperature. Whether the running state of the air conditioner meets the requirements or not can be accurately judged through a combination mode of multiple modes, whether the running of the air conditioner is stable or not can be further judged, and a refrigerant leakage judging program is entered when the running of the air conditioner is stable, so that the detection accuracy is guaranteed.
And S2, executing a refrigerant leakage judging program, and determining whether refrigerant leakage occurs according to whether the real-time exhaust temperature of the compressor meets a first preset condition and whether the temperature difference between the indoor temperature and the refrigerant temperature at the outlet of the evaporator meets a second preset condition.
Specifically, the first preset condition is that the ratio of the difference between the real-time exhaust temperature and the theoretical exhaust temperature of the compressor to the theoretical exhaust temperature is greater than a second preset threshold, the second preset threshold is set according to actual needs, preferably, the second preset threshold is set to be 0.1-0.2, and more preferably, the second preset threshold is set to be 0.15. Once the refrigerant in the air conditioner leaks, the discharge temperature of the compressor fluctuates greatly, that is, the real-time discharge temperature of the compressor deviates greatly from the theoretical discharge temperature, so that whether the refrigerant in the air conditioner leaks or not can be determined in time according to the real-time discharge temperature of the compressor and the determined theoretical discharge temperature.
However, in the actual use process of the air conditioner, the factors affecting the discharge temperature of the compressor include the refrigerant pressure, the compressor performance, the vibration of the pipeline and other factors besides the refrigerant amount, so when the real-time discharge temperature of the compressor is deviated from the theoretical discharge temperature to judge whether the refrigerant leakage occurs, the phenomenon of misjudgment is easy to occur, and therefore, further judgment is needed to verify whether the refrigerant leakage occurs.
Further, the second preset condition is that the rate of change with time of the temperature difference between the indoor temperature T1 and the refrigerant temperature Te at the evaporator outlet is larger than a third preset threshold.
For the case where there is no leakage in the air conditioner, the evaporator inlet and outlet temperatures are substantially constant in the steady operation of the air conditioner. Accordingly, the temperature difference between the indoor temperature T1 and the refrigerant temperature Te at the evaporator outlet is also substantially constant. The refrigerant is circulated through a refrigerant circuit of the air conditioner, wherein the amount of refrigerant is kept substantially constant.
Further, the third preset threshold is set according to the temperature difference between the indoor temperature T1 of the air conditioner in the steady operation state and the refrigerant temperature Te at the outlet of the evaporator at the time of the standard refrigerant amount.
S3, a refrigerant leakage verification process is executed.
Whether the refrigerant leakage occurs is further verified by the rate of change of the air conditioner voltage value with time and the rotation speed of the compressor. In step S2, the result of determination as to whether or not refrigerant leakage has occurred is more accurate. The misjudgment is avoided, the refrigerant leakage phenomenon is timely alarmed and maintained, the service life of the air conditioner is prolonged, and the user experience is improved.
And S4, executing a refrigerant leakage amount judging program, and judging the refrigerant leakage amount according to whether the return air temperature of the compressor is within a preset temperature range.
There are several ways to determine whether the refrigerant leaks according to the detected return air temperature, and as an optional embodiment, when the return air temperature is detected to be greater than Ta and less than Tb, it is determined that the compressor is running with insufficient refrigerant amount, but the compressor can still run normally, where Tb > Ta. When the return air temperature is higher than Ta and lower than Tb, the return air temperature is higher, the heat exchange of the refrigerant is over sufficient, and therefore the amount of the refrigerant is less, namely the amount of the refrigerant in the operation of the compressor is insufficient, but the return air temperature is still within the normal range of the operation of the compressor, and the compressor can still normally operate.
And when the detected return air temperature is higher than Tb, judging that the refrigerant of the compressor is seriously insufficient and the compressor cannot normally run. When the return air temperature is higher than Tb, the return air temperature is high, and the refrigerant quantity can not meet the heat exchange requirement, so that the refrigerant quantity is low, namely the refrigerant quantity is seriously insufficient when the compressor operates, and the return air temperature is out of the normal range at the moment, so that the compressor can not normally operate.
The refrigerant leakage detection method provided by the embodiment can accurately judge whether refrigerant leakage occurs, avoids the influence of factors such as refrigerant pressure, compressor performance and pipeline vibration on the refrigerant leakage judgment process, and can also accurately judge whether the refrigerant needs to be supplemented or not after the refrigerant leakage is judged, so that a user or a maintenance worker can conveniently maintain the air conditioner and fill the refrigerant, and the user experience is improved.
Example 2
As shown in fig. 2 to 4, the present embodiment further defines a refrigerant leakage detection method based on embodiment 1, and specifically includes the following steps:
s11, after the air conditioner is started, the system automatically records the continuous operation time ta of the compressor, judges whether the continuous operation time ta of the compressor reaches a first preset time t1, and executes the step S12 when the continuous operation time ta of the compressor reaches the first preset time t 1.
Specifically, after the air conditioner is started, the air conditioner does not adjust the indoor environment temperature, the difference value between the indoor environment temperature and the target temperature set by a user is large, the compressor runs at a high frequency to quickly adjust the indoor temperature, the opening degree of the expansion valve is large, the running state of the air conditioner tends to be stable after the continuous running time of the compressor reaches a first preset time, the accuracy is high when the indoor environment temperature, the indoor coil pipe temperature and the outdoor environment temperature are detected, and misjudgment caused by the fact that the running state of the air conditioner is not stable in a period of time after the air conditioner is started initially is prevented.
Further, a timing module is arranged in the air conditioner, and if the compressor starts to operate, a trigger signal is sent to the timing module so as to enable the timing module to count the operation time of the compressor. When the continuous operation time ta of the compressor reaches the first preset time t1, step S12 is performed.
Preferably, the first preset time t1 is set according to an operating power and an energy efficiency value of the air conditioner.
S12, detecting the indoor temperature T1 and the indoor coil temperature T2, and calculating a first temperature difference value delta T1 of the indoor temperature T1 and the indoor coil temperature T2.
Specifically, the indoor temperature T is detected by the first temperature sensor1Detecting the temperature T of the indoor coil pipe through a second temperature sensor2. Obtaining indoor temperature T1And indoor coil temperature T2Then, calculating to obtain the indoor temperature T1And indoor coil temperature T2Is equal to | T of the first temperature difference Δ T11-T2|，
Further, the first temperature sensor is arranged at an air inlet of the indoor unit and used for detecting indoor temperature; the second temperature sensor is arranged on the indoor evaporator coil and used for detecting the temperature of the indoor coil.
S13, judging whether the first temperature difference value delta T1 is smaller than a first preset threshold value delta T or not0If yes, step S14 is executed, otherwise, the compressor maintains the current operation state.
Further, in the cooling and dehumidifying mode, the first preset threshold Δ T0The value is 2 ℃, and under the heating mode, the first preset threshold value delta T0The value was 3 ℃. When | T1-T2|<ΔT0If so, executing step S14 to obtain the outdoor environment temperature; if the temperature difference Δ T1 is not less than the first predetermined threshold Δ T0The compressor maintains the current operation state.
Preferably, in order to avoid erroneous determination caused by a failure or a deviation in detection between the first temperature sensor and the second temperature sensor, a certain continuous time is set, and if the temperature difference Δ T1 between the indoor temperature T1 and the indoor coil temperature T2 is always smaller than the first preset threshold Δ T0 within the continuous time, that is, Δ T1< Δ T0 is always satisfied within the continuous time, step S14 is executed to acquire the outdoor ambient temperature.
S14, acquiring the outdoor environment temperature T3, and acquiring a preset maximum compressor frequency value Fr at the temperature;
further, the outdoor environment temperature T3 is detected by a third temperature sensor, the third temperature sensor is disposed at an outlet of the outdoor unit fan, and after the current outdoor environment temperature T3 is obtained, the maximum frequency value Fr of the compressor corresponding to the temperature value is found by looking up a table. The one-to-one correspondence relationship between the outdoor ambient temperature T3 and the maximum frequency value Fr of the compressor is preset before shipment, and preferably, considering the feasibility of the frequency adjustment of the compressor, generally, one outdoor ambient temperature value interval corresponds to one maximum frequency value Fr of the compressor.
S15, acquiring the real-time operation frequency Fr1 and the real-time exhaust temperature T4 of the compressor.
Further, the real-time discharge temperature T4 of the compressor is detected by a fourth temperature sensor, and the fourth temperature sensor is arranged at the discharge port of the compressor.
After the outdoor environment temperature T3 and the corresponding maximum frequency value Fr of the compressor are obtained, the real-time running frequency Fr1 of the compressor and the real-time exhaust temperature T4 of the exhaust port of the compressor are further obtained; and compares the real-time operating frequency Fr1 and the real-time exhaust temperature T4 with the aforementioned maximum frequency value Fr and a fifth preset threshold value Tmax, respectively.
S16, judging whether the real-time running frequency Fr1 and the real-time exhaust temperature T4 of the compressor meet a third preset condition, if so, executing a step S2; if not, the compressor continues to operate in the current state.
Specifically, the third preset condition is as follows: the compressor real-time discharge temperature T4 is greater than a preset fifth preset threshold Tmax, and the real-time operating frequency Fr1 is less than the compressor maximum frequency value Fr.
Since the refrigerant leakage inevitably reduces the amount of refrigerant sucked into the compressor, resulting in a reduction in the amount of heat generated by the refrigerant carrying out the motor of the compressor, the temperature of the discharge port rises, and therefore, when the real time discharge temperature T4 is relatively high, it should be considered whether or not the refrigerant leakage occurs. Preferably, after the real-time exhaust gas temperature T4 exceeds the preset fifth preset threshold value Tmax, it is further determined whether the real-time operating frequency Fr1 of the compressor is still further away from the aforementioned maximum frequency value Fr.
Preferably, the difference between the real-time running frequency Fr1 and the maximum frequency Fr is measured by setting a parameter N, and further, N is a constant, preferably N ≧ 3. When T4 > Tmax and Fr 1< Fr-N, the system may be controlled to execute the refrigerant leakage determination routine.
Further, the refrigerant leakage determination routine S2 includes the steps of:
s21, judging whether the ratio of the difference value between the real-time exhaust temperature T4 and the theoretical exhaust temperature to the theoretical exhaust temperature is larger than the second preset threshold value or not, and if yes, executing a step S22; if not, the refrigerant in the air conditioner is judged not to leak, and the compressor maintains the current running state.
The theoretical discharge temperature of the compressor can be determined according to the working condition (such as the outdoor ambient temperature) and the running state (such as the running frequency of the compressor) of the air conditioner, as the air-conditioner has the leakage of the refrigerant, the discharge temperature of the compressor has larger fluctuation, namely the discharge temperature of the compressor has larger deviation relative to the theoretical discharge temperature, can determine whether the refrigerant in the air conditioner leaks or not in time according to the real-time exhaust temperature of the compressor and the determined theoretical exhaust temperature, the air conditioner has the function of detecting whether the refrigerant leaks or not according to the exhaust temperature, the function of the air conditioner is further improved, the air conditioner is prevented from being damaged due to refrigerant leakage as much as possible, the self-protection capability of the air conditioner is improved, and the potential safety hazard brought to users due to the refrigerant leakage is avoided.
Determining that the refrigerant in the air conditioner may leak when it is determined that the ratio of the difference between the real-time discharge temperature T4 and the theoretical discharge temperature to the theoretical discharge temperature is greater than the second preset threshold; and determining that the refrigerant in the air conditioner is not leaked when it is determined that the ratio of the difference between the real-time discharge temperature T4 and the theoretical discharge temperature to the theoretical discharge temperature is not greater than the second preset threshold.
By judging whether the difference between the real-time exhaust temperature and the theoretical exhaust temperature and the ratio of the theoretical exhaust temperature are greater than a second preset threshold (for example, 15%, the second preset threshold can be adjusted according to actual requirements), if the difference between the real-time exhaust temperature and the theoretical exhaust temperature and the ratio of the theoretical exhaust temperature are greater than the second preset threshold, the deviation of the real-time exhaust temperature from the theoretical exhaust temperature is large, the possibility of leakage of the refrigerant in the air conditioner can be judged to be large, and if the difference between the real-time exhaust temperature and the theoretical exhaust temperature and the ratio of the theoretical exhaust temperature are not greater than the second preset threshold, the deviation of the real-time exhaust temperature from the theoretical exhaust temperature is in a reasonable range, and the refrigerant in the air conditioner can be determined not to be leaked.
Specifically, in the actual operation process of the air conditioner, there are many factors affecting the discharge temperature of the compressor, including the refrigerant pressure, the compressor performance, the vibration of the pipeline and other factors besides the amount of the refrigerant, so after determining that the ratio of the difference between the real-time discharge temperature and the theoretical discharge temperature to the theoretical discharge temperature is greater than the second preset threshold, further detection is required to improve the accuracy of refrigerant leakage detection.
S22, acquiring a change curve of the indoor temperature T1 and a change curve of the refrigerant temperature Te at the outlet of the evaporator, and calculating a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator.
As shown in fig. 4, further, when the air conditioner is operated, a first temperature sensor provided at an air inlet of the indoor unit transmits a detected indoor temperature T1 to the control system, and a third temperature sensor provided at an evaporator outlet transmits a detected refrigerant temperature Te at the evaporator outlet to the control system. And the control system calculates a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the evaporator outlet.
For the case where there is no leakage in the air conditioner, the indoor temperature T1, the refrigerant temperature Te at the evaporator outlet are substantially constant in the steady operation of the air conditioner. Accordingly, the second temperature difference Te1 is also substantially constant. The refrigerant is circulated through a refrigerant circuit of the air conditioner, wherein the amount of refrigerant is kept substantially constant.
But during the actual operation of the air conditioner, e.g. at time tbA phenomenon of refrigerant leakage occurs. A certain amount of refrigerant is lost from the refrigerant circulation circuit due to leakage. The heat delivered to the refrigerant circulation circuit by the fan at the refrigerant evaporator remains substantially the same. Heat is extracted from the refrigerant at the refrigerant condenser via a fan, which remains substantially unchanged. The indoor temperature T1 to be air-conditioned also remains substantially constant. The refrigerant temperature Te at the evaporator outlet increases because a constant amount of heat is introduced into the reduced amount of refrigerant at the refrigerant evaporator, and therefore, the second temperature difference Te1 decreases.
S23, judging whether the change rate of a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator along with time is larger than a third preset threshold value or not, and if yes, judging that the refrigerant leaks; if not, the refrigerant in the air conditioner is judged not to leak, and the compressor continues to be in the current running state.
Further, the pressure in the refrigerant circulation circuit is lowered, and the control system compares a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the evaporator outlet with a third preset threshold value, which is stored in the control system. Preferably, the third preset threshold value can be 2K/min. If the second temperature difference Te1 decreases by more than 2K/min, it is determined that leakage of refrigerant occurs.
Preferably, in the process of determining the refrigerant leakage, the refrigerant circulation circuit is long, and in order to avoid erroneous determination, it is necessary to further execute the refrigerant leakage verification routine S3, and to accurately and reliably determine whether the refrigerant leakage has occurred.
Further, the refrigerant leakage verification process S3 includes the steps of:
and S31, acquiring the average value of the voltage values, and calculating the time-dependent change rate of the voltage values.
Specifically, the average value of the voltage values V from the time when the air conditioner is started to operate to a certain time tc is detected, the average value of the voltage values V (t-1) of a unit time tc-1 (specifically, a previous minute) before the detection time is obtained, and the change rate R of the voltage of each unit time (each minute) along with the time is calculated.
Specifically, when the refrigerant leaks, the load of the compressor is changed, and the input voltage value and the time change rate of the voltage value of the air conditioner are affected.
S32, judging whether the time-dependent change rate R of the voltage exceeds a fourth preset threshold value, if not, indicating that a judgment error may occur in the step S2, returning to the step S21, and continuing to judge the refrigerant leakage; if yes, go to step S33 for further verification.
And S33, detecting the rotating speed of the motor, and calculating the rotating speed N of the compressor corresponding to the rotating speed of the motor.
Specifically, the rotation speed of the motor is read by a rotation speed detection sensor.
S34, judging whether the rotating speed N of the compressor is less than the preset reference rotating speed N0, if not, indicating that the misjudgment occurs in the refrigerant leakage judging program, returning to the step S21, and continuing to detect the refrigerant leakage judging program; if yes, it is determined that leakage of the refrigerant occurs, and step S4 is executed to further determine the amount of refrigerant leakage in the air conditioner and determine whether or not addition of the refrigerant is necessary.
The refrigerant leakage amount determination routine S4 includes the steps of:
and S41, controlling the compressor to operate at the highest frequency and controlling the inner fan to operate at the maximum rotating speed.
And S42, judging whether the time tb of the highest running frequency of the compressor and the maximum running speed of the inner fan exceeds a second preset time t 2. If yes, go to step S43, otherwise, continue to operate in the current state until reaching the second preset time t 2.
Preferably, t2 is 10 min. When the compressor continuously operates for 10min at the highest frequency and the maximum rotating speed of the inner fan, the current return air temperature is stable, the return air temperature is detected, and whether the refrigerant leaks or not is judged accurately and reliably according to the detected return air temperature. Of course, t2 may be the time required for stable operation of other air conditioners.
And S43, acquiring the return air temperature T5 of the compressor.
When the compressor runs at the highest frequency and the internal fan runs at the maximum speed for continuous operation for T2 time, the return air temperature T5 of the compressor is detected. In this embodiment, after the compressor is continuously operated at the maximum frequency and the inner fan is continuously operated for time T2, the return air temperature T5 is relatively stable, the detected return air temperature T5 of the compressor is relatively more reliable, and whether the refrigerant leaks or not is more accurately and reliably judged according to the detected return air temperature.
S44, judging whether the return air temperature T5 of the compressor is in a preset temperature range, namely Ta ≦ T5 ≦ Tb.
Further, when the return air temperature T5 is detected to be greater than Ta and less than Tb, wherein Tb > Ta, it is insufficient to judge the compressor operation refrigerant quantity, but the compressor still can normally operate, and the system control alarm device makes the second grade suggestion of reporting to the police, and the air conditioner can also operate a period of time. When the return air temperature T5 is greater than Ta and less than Tb, it indicates that the return air temperature is higher and the heat exchange of the refrigerant is over sufficient, and therefore it is determined that the refrigerant amount is less, that is, the amount of refrigerant in operation of the compressor is insufficient, but at this time, the return air temperature is still within the normal range of the operation of the compressor, and the compressor can still operate normally.
Further, when the detected return air temperature is higher than Tb, the condition that the refrigerant of the compressor is seriously insufficient and the compressor cannot normally operate is indicated, the system controls the alarm device to give a first-level alarm prompt and controls the compressor to stop until the refrigerant supplement is completed. When the return air temperature is higher than Tb, the return air temperature is high, and the refrigerant quantity can not meet the heat exchange requirement, so that the refrigerant quantity is low, namely the refrigerant quantity is seriously insufficient when the compressor operates, and the return air temperature is out of the normal range at the moment, so that the compressor can not normally operate.
Preferably, the preset temperature range is 20 ℃ to 25 ℃, that is, when the return air temperature is greater than T1, that is, greater than 20 ℃, it indicates that the amount of refrigerant of the compressor is small, but the current heat exchange requirement can still be met, and when the return air temperature is greater than T2, that is, greater than 25 ℃, it indicates that the amount of refrigerant is seriously insufficient, the heat exchange requirement cannot be met, and the operation of the compressor is seriously affected.
The refrigerant leakage detection method provided by the embodiment can not only timely and accurately judge whether the refrigerant in the air conditioner leaks through multi-stage detection and verification, further improve the function of the air conditioner, avoid the damage to the air conditioner caused by the refrigerant leakage as far as possible, improve the self-protection capability of the air conditioner, avoid the potential safety hazard brought to users due to the refrigerant leakage, but also accurately judge whether the leakage amount of the refrigerant affects the operation of the compressor or not and whether the refrigerant needs to be supplemented or not after the refrigerant leakage is judged, and is convenient to maintain.
Example 3
The present embodiment further provides an air conditioner based on embodiments 1 and 2, where the air conditioner employs the refrigerant leakage detection method described in the above embodiments, and specifically the air conditioner includes a compressor, an evaporator, a refrigerant circulation pipeline, a detection system, a timing module, and a control system; the detection system and the timing module are connected with the control system, one end of the refrigerant circulating pipeline system is connected with the compressor, and the other end of the refrigerant circulating pipeline system is connected with the evaporator. The detecting system includes temperature detecting system and rotational speed detector, temperature detecting system includes:
the first temperature sensor is arranged at an air inlet of the indoor unit and used for detecting indoor temperature;
the second temperature sensor is arranged on an indoor unit evaporator coil and used for detecting the temperature of the indoor coil;
the third temperature sensor is arranged at the outlet position of the outdoor unit fan and used for detecting the outdoor environment temperature;
the fourth temperature sensor is arranged at the air outlet of the compressor and used for detecting the real-time air exhaust temperature of the compressor;
the fifth temperature sensor is arranged at the refrigerant outlet of the evaporator and used for detecting the temperature of the refrigerant at the outlet of the evaporator;
and the sixth temperature sensor is arranged at the air inlet of the compressor and used for detecting the return air temperature of the compressor.
The rotating speed detector is connected to a motor of the compressor and used for detecting the rotating speed of the motor of the compressor.
The air conditioner provided by the embodiment has the same advantages as the refrigerant leakage detection method compared with the prior art, and the details are not repeated herein.
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 refrigerant leak detection method, comprising the steps of:
s1, detecting the current running state of the air conditioner, and when the running of the air conditioner is stable, the control system enters a refrigerant leakage judging program;
s2, executing a refrigerant leakage judging program, and judging that refrigerant leakage occurs when the real-time exhaust temperature of the compressor meets a first preset condition and the temperature difference between the indoor temperature and the refrigerant temperature at the outlet of the evaporator meets a second preset condition;
s3, executing the refrigerant leakage verification program;
and S4, executing a refrigerant leakage amount judging program, and judging the refrigerant leakage amount according to whether the return air temperature of the compressor is within a preset temperature range.
2. The refrigerant leak detection method according to claim 1, wherein the first preset condition is that a ratio of a difference between a real-time discharge temperature and a theoretical discharge temperature of the compressor to the theoretical discharge temperature is greater than a second preset threshold, and the second preset threshold is set to 0.1 to 0.2.
3. The refrigerant leak detection method according to claim 1, wherein the second preset condition is that a rate of change with time of a second temperature difference Te1 between the room temperature T1 and the refrigerant temperature Te at the evaporator outlet is larger than a third preset threshold value set in accordance with a rate of change with time of the second temperature difference Te1 at the standard refrigerant quantity.
4. The refrigerant leak detection method according to claim 1, wherein said S1 includes the steps of:
s11, after the air conditioner is started, the system automatically records the continuous operation time ta of the compressor, judges whether the continuous operation time ta of the compressor reaches a first preset time t1, and executes the step S12 when the continuous operation time ta of the compressor reaches the first preset time t 1;
s12, detecting the indoor temperature T1 and the indoor coil temperature T2, and calculating a first temperature difference value delta T1 between the indoor temperature T1 and the indoor coil temperature T2;
s13, judging whether the first temperature difference value delta T1 is smaller than a first preset threshold value delta T0, if so, executing a step S14, and if not, maintaining the current running state of the compressor;
s14, acquiring the outdoor environment temperature T3, and acquiring a preset maximum compressor frequency value Fr at the temperature;
s15, acquiring the real-time running frequency Fr1 and the real-time exhaust temperature T4 of the compressor;
s16, judging whether the real-time running frequency Fr1 and the real-time exhaust temperature T4 of the compressor meet a third preset condition, if so, executing a step S2; if not, the compressor continues to operate in the current state.
5. The refrigerant leak detection method according to claim 1, wherein said S2 includes the steps of:
s21, judging whether the ratio of the difference value between the real-time exhaust temperature T4 and the theoretical exhaust temperature to the theoretical exhaust temperature is larger than a second preset threshold value or not, and if yes, executing a step S22; if not, judging that the refrigerant in the air conditioner is not leaked;
s22, acquiring a change curve of the indoor temperature T1 and a change curve of the refrigerant temperature Te at the outlet of the evaporator, and calculating a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator;
s23, judging whether the change rate of a second temperature difference Te1 between the indoor temperature T1 and the refrigerant temperature Te at the outlet of the evaporator along with the time is larger than a third preset threshold value, if so, judging that the refrigerant leaks, and executing a step S3; if not, the compressor continues to operate in the current state.
6. The refrigerant leak detection method according to claim 4, wherein the third preset condition is: the compressor real-time discharge temperature T4 is greater than a preset fifth preset threshold Tmax, and the real-time operating frequency Fr1 is less than the compressor maximum frequency value Fr.
7. The refrigerant leak detection method according to claim 1, wherein the S3 includes:
s31, obtaining the average value of the voltage values, and calculating the time-dependent rate of change of the voltage values;
s32, judging whether the time-dependent change rate R of the voltage exceeds a fourth preset threshold, if so, indicating that a judgment error may occur in the step S2, returning to the step S21, and continuing to judge the refrigerant leakage; if not, executing step S33 for further verification;
s33, detecting the rotating speed of the motor, and calculating the rotating speed N of the compressor corresponding to the rotating speed of the motor;
s34, judging whether the rotating speed N of the compressor is less than the preset reference rotating speed N0, if not, indicating that the misjudgment occurs in the refrigerant leakage judging program, returning to the step S21, and continuing to detect the refrigerant leakage judging program; if yes, it is determined that the leakage of the cooling refrigerant occurs, and step S4 is executed to further determine the amount of refrigerant leakage in the air conditioner and determine whether or not the addition of the refrigerant is necessary.
8. The refrigerant leak detection method according to claim 1, wherein said S4 includes the steps of:
s41, controlling the compressor to run at the highest frequency and controlling the inner fan to run at the maximum rotating speed;
s42, judging whether the time tb of the highest running frequency of the compressor and the maximum running speed of the inner fan exceeds a second preset time t2, if so, executing the step S43, and if not, continuing running in the current state until the second preset time t2 is reached;
s43, acquiring the return air temperature T5 of the compressor;
s44, judging whether the return air temperature T5 of the compressor is within a preset temperature range, if so, indicating that the leakage of the refrigerant is not serious, and controlling an alarm device to give a secondary alarm prompt by a system, wherein the air conditioner can also run for a period of time; if not, the refrigerant leakage of the air conditioner is serious, the system controls the alarm device to give a first-level alarm prompt and controls the compressor to stop until the refrigerant supplement is finished.
9. An air conditioner using the refrigerant leakage detecting method according to any one of claims 1 to 8, the air conditioner comprising a compressor, an evaporator, a refrigerant circulation system, a detection system, a timing module, and a control system; the detection system and the timing module are connected with the control system, one end of the refrigerant circulating pipeline system is connected with the compressor, and the other end of the refrigerant circulating pipeline system is connected with the evaporator.
10. The air conditioner of claim 9, wherein the detection system comprises a temperature detection system and a rotational speed detector, the temperature detection system comprising:
the first temperature sensor is arranged at an air inlet of the indoor unit and used for detecting indoor temperature;
the second temperature sensor is arranged on the indoor evaporator coil and used for detecting the temperature of the indoor coil;
the third temperature sensor is arranged at the outlet position of the outdoor unit fan and used for detecting the outdoor environment temperature;
the fourth temperature sensor is arranged at the air outlet of the compressor and used for detecting the real-time air exhaust temperature of the compressor;
the fifth temperature sensor is arranged at the refrigerant outlet of the evaporator and used for detecting the temperature of the refrigerant at the outlet of the evaporator;
the sixth temperature sensor is arranged at the air inlet of the compressor and used for detecting the return air temperature of the compressor;
the rotating speed detector is connected to a motor of the compressor and used for detecting the rotating speed of the motor of the compressor.
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