CN111473470A - System and method for judging rapid leakage of refrigerant of variable-frequency refrigeration system - Google Patents
System and method for judging rapid leakage of refrigerant of variable-frequency refrigeration system Download PDFInfo
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- CN111473470A CN111473470A CN202010321614.5A CN202010321614A CN111473470A CN 111473470 A CN111473470 A CN 111473470A CN 202010321614 A CN202010321614 A CN 202010321614A CN 111473470 A CN111473470 A CN 111473470A
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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
- F24F11/56—Remote control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention provides a system and a method for judging rapid leakage of a refrigerant of a variable-frequency refrigeration system, belonging to the field of rapid leakage judgment of the refrigerant in the refrigeration system. In order to solve the problems that the existing refrigerant leakage judging method has certain hysteresis and inaccuracy and simultaneously has no problem of carrying out quick real-time effective identification and judgment on the large system leakage which appears instantly, the invention comprises the following steps: prestoring a corresponding relation table of the winding current of the motor inside the compressor and the frequency of the motor inside the compressor, and prestoring a current difference threshold value under each frequency; acquiring the current of a motor winding in the compressor at regular intervals; comparing current values obtained at two continuous moments in the certain time interval to generate a current difference under the specified frequency; and judging whether the current difference is in a prestored current difference threshold range under the specified frequency, if so, indicating that the refrigerant does not leak rapidly, and otherwise, indicating that the refrigerant leaks rapidly.
Description
Technical Field
The invention relates to the field of rapid refrigerant leakage judgment in a refrigeration system, in particular to a system and a method for judging rapid refrigerant leakage of a variable-frequency refrigeration system.
Background
The refrigeration system is sealed through the tubular metal resonator connection by parts such as compressor, condenser, throttling arrangement and evaporimeter, and inside notes annotates the refrigerant, and wherein the compressor is common to use totally enclosed to be given first place to, and the compressor is accomplished from breathing in to the exhaust process is realized through the motor operation, because the motor work is inevitable to generate heat, if the heat can not in time take away or reach the equilibrium, can make motor winding temperature constantly rise, finally surpasss the insulating safe temperature requirement, leads to the motor to appear inefficacy.
Refrigerant flows through the motor before (or after) the compressor finishes compressing, heat dissipation of the compressor motor is achieved through heat exchange, and the temperature of a motor winding, namely the heat dissipation effect, depends on the flow rate of the refrigerant and the temperature of the refrigerant. After the refrigerant flows through the compressor motor, the exhaust pipeline continuously exchanges heat with the ambient air through the compressor shell, and the temperature of high-temperature gas of the refrigerant is also continuously reduced. The refrigerant may leak slowly during the operation of the refrigeration system, but also may have quality problems such as 'hydrogen embrittlement' caused by installation quality and system component quality, such as a false weld of an elbow, or a pipeline welding process problem, when the refrigeration system operates at a large working pressure, a pipeline is broken to generate a large leak point, and the refrigerant may leak rapidly. According to the existing system protection, the problems can not be identified, and finally, the temperature of a motor of the compressor is overhigh, and the insulation is damaged to lose efficacy.
Most of the current environment-friendly refrigerants have flammability, such as: the slow leakage of R32, R290, etc. is not easy to reach the lower limit value of explosive combustion in the living environment of users, but the quick leakage is the possibility of causing injury or damage to the human bodies of the users and the living environment and needs to be quickly and accurately identified. For an air conditioner using combustible refrigerant such as R290 (propane) and the like, a sensor is installed in a use environment to monitor whether the problem of refrigerant leakage exists, different refrigerants need to be provided with different monitoring sensors, even if the sensors are installed, the sensors are limited by the relative positions of a system leakage point and the sensors, whether the sensors are influenced by air outlet and the like, and actually, the problem that whether the sensors are leaked cannot be accurately judged, namely, the sensors are installed at increased cost, and the problem cannot be accurately identified.
At present, for flammable refrigerants leaking in the air, if detonation is required, the following two conditions need to be achieved: first, the flammable refrigerant is located between the upper and lower combustion limits; second, open flames, electrical sparks, and static electricity with certain temperature and energy. When these two conditions are met, a combustion or explosion situation can occur. Therefore, the refrigeration system of flammable refrigerants needs to be detected through the installed sensor, otherwise, the safety accident of explosion exists. Therefore, if the combustible refrigerant is leaked quickly, serious safety hazards are brought to users.
In addition, the internal pressure of the known refrigeration system is far greater than the ambient atmospheric pressure, and the refrigerant always has a leakage problem in the pipeline. If there are defects in the pipeline such as: the sand hole, along with refrigerating system operation, refrigeration circuit's pressure is higher and higher, and when reaching the unable pressure value that bears of defect point, the sudden leakage of operating refrigerating system meeting to combustible refrigerant, if leak and be in airtight space, and the air conditioner was still operating this moment, not only can bring serious potential safety hazard to the airtight space of leakage point, probably causes personnel's health injury to the user. In addition, with the leakage of a large amount of refrigerant, the general exhaust protection is disabled, the temperature of the motor winding is abnormally high, and the exhaust temperature is not high, because the refrigerant flow is small and is not enough to dissipate heat of the motor, but the refrigerant temperature is quickly reduced by the heat exchange between the compressor shell and the exhaust pipe and the outside. As the refrigerant is rapidly lost, the motor temperature is high, which eventually causes insulation breakdown, the motor windings may ignite, and as the pressure in the system decreases, the outside air may continuously infiltrate into the refrigeration system, which may eventually explode the outdoor unit.
In the past, there has been a method for detecting the leakage of refrigerant of an air conditioner by using the discharge temperature of a compressor, for example, the patent number is CN201610111330.7, the name of the invention is: a method and a device for detecting the leakage of the refrigerant of an air conditioner are provided. The invention discloses a method for detecting the refrigerant leakage of an air conditioner, which comprises the following steps: starting a counting function according to a detection instruction during the operation of a compressor in a refrigeration or dehumidification mode; setting an opening value of a first expansion valve of the compressor and a first rotating speed value of an indoor fan, and detecting the exhaust temperature of the compressor after setting time; adjusting the opening value of a second expansion valve of the compressor and a second rotating speed value of the indoor fan, and detecting the first exhaust temperature of the compressor after the first set time; fourthly, calculating the temperature difference between the exhaust temperature and the first exhaust temperature, and adding 1 to the count value when the temperature difference is smaller than a set temperature threshold value; fifthly, when the counting value does not reach the set counting threshold value, returning to the step two; when the counting value reaches the set counting threshold value, the refrigerant leakage is judged. The invention also discloses a device for detecting the refrigerant leakage of the air conditioner. The method and the device provided by the invention reduce the misjudgment of the refrigerant leakage of the air conditioner, improve the accuracy of the refrigerant leakage judgment and accurately detect the condition of the slow refrigerant leakage.
As another example, the patent numbers are: CN 201610319177.7; the invention has the name: the invention provides a refrigerant leakage detection method, a refrigerant leakage detection device and an air conditioner, wherein the refrigerant leakage detection method comprises the following steps: detecting real-time exhaust temperature of a compressor of an air conditioner; determining the theoretical exhaust temperature of the compressor according to the working condition and the running state of the air conditioner; and determining whether the refrigerant in the air conditioner leaks or not according to the real-time exhaust temperature and the theoretical exhaust temperature. By the technical scheme of the invention, whether the refrigerant in the air conditioner leaks can be detected, and the damage to the air conditioner and the potential safety hazard brought to users due to the refrigerant leakage can be avoided as much as possible.
The following steps are repeated: the patent numbers are: CN200810153272.X, invention name: the invention discloses a protection device for preventing the exhaust temperature of an air conditioner compressor from being overhigh, which is characterized in that an electromagnetic valve is arranged between a return pipe of the compressor connected with a liquid storage tank and a liquid pipe which is connected with an outdoor heat exchanger and enables a refrigerant to flow to an indoor evaporator, and the electromagnetic valve is opened when an exhaust pipe of the compressor exceeds a set value according to the sensing of a temperature sensor on the compressor. The invention has the beneficial effects that: when the system refrigerant leaks, the exhaust temperature of the compressor is protected from being overhigh, and the compressor is prevented from being damaged due to overhigh exhaust temperature. Therefore, the compressor protection device can better improve the performance and the service life of the product and improve the competitive capacity of the product.
Also, patent No. 201910803891.7, patent name: the embodiment of the invention discloses a method and a system for detecting the leakage of a refrigerant of an air conditioning system, which can solve the problem that the existing method for detecting the leakage of the refrigerant is difficult to accurately judge whether the leakage point of the air conditioning system exists or not so as to cause the continuous leakage of the refrigerant, and provides a method for detecting the refrigerant of the air conditioning system, which comprises the following steps: establishing a functional relation among the outdoor environment temperature, the temperature difference between the winding temperature of the compressor and the temperature of the exhaust pipeline, the frequency of the compressor and the refrigerant charging amount; calculating the refrigerant charge of each period based on the functional relationship according to the outdoor environment temperature, the temperature difference between the compressor winding temperature and the exhaust pipeline temperature and the compressor frequency which are obtained in the preset period; and if the refrigerant charge amount of the current period is less than the refrigerant charge amount of the previous period, and the difference value between the refrigerant charge amount of the previous period and the refrigerant charge amount of the current period is greater than or equal to a first preset threshold value, judging that the air conditioning system has refrigerant leakage. The invention improves the accuracy of judging the leakage of the refrigerant. The calculation procedure for the fast leak is complicated and has a problem of hysteresis.
In summary, although the prior art can detect whether the refrigerant leaks, most of the prior art mainly detects or senses and estimates the internal temperature of the compressor through the exhaust temperature, and has certain hysteresis and inaccuracy; meanwhile, the system large leakage which appears instantly does not exist, and the rapid real-time effective identification and judgment are carried out.
Disclosure of Invention
The invention aims to provide a system and a method for judging rapid leakage of a refrigerant of a variable-frequency refrigeration system, which solve the problems that the conventional method for judging the leakage of the refrigerant has certain hysteresis and inaccuracy, and meanwhile, rapid and real-time effective identification and judgment are not carried out on the large leakage of the system which occurs instantly.
The invention solves the technical problem, and adopts the technical scheme that: the judgment system for the rapid leakage of the refrigerant of the variable-frequency refrigeration system comprises a compressor current driving module, a compressor current detection module and a refrigerant leakage judgment module, wherein the compressor current driving module is connected with the refrigerant leakage judgment module through the compressor current detection module;
the compressor current driving module is used for driving a motor inside the compressor to run at a specified frequency, and a motor winding inside the compressor generates current at the frequency;
the compressor current detection module is used for acquiring the current of a motor winding in the compressor at regular intervals and transmitting the current to the refrigerant quick leakage judgment module;
the refrigerant quick leakage judging module is pre-stored with a corresponding relation table of the winding current of the motor inside the compressor and the frequency of the motor inside the compressor, and a current difference threshold value under each frequency is pre-stored;
when the compressor current detection module transmits the acquired current of the motor winding inside the compressor to the refrigerant quick leakage judgment module, the refrigerant quick leakage judgment module compares current values acquired at two continuous moments in a certain time interval to generate a current difference under the specified frequency, and judges whether the current difference is within a prestored current difference threshold range under the specified frequency, if so, the refrigerant does not have quick leakage, otherwise, the refrigerant has quick leakage.
Further, the motor winding current is obtained by detecting the motor winding parameters in the compressor.
The system further comprises a frequency detection module, wherein the frequency detection module is connected with the compressor current driving module and the refrigerant quick leakage judging module, and is used for detecting the operating frequency of a motor in the compressor and transmitting the operating frequency to the refrigerant quick leakage judging module.
The system further comprises a sharing module, wherein the sharing module is connected with the refrigerant quick leakage judging module, and when the refrigerant quick leakage judging module judges that the refrigerant quickly leaks, the sharing module stores the corresponding data when the refrigerant quickly leaks.
Further, the system also comprises a mobile terminal and a server, wherein the server is used for storing the data in the sharing module, transmitting the data to the mobile terminal and sending the processing information to the mobile terminal.
In addition, the invention also provides a method for judging the quick leakage of the refrigerant of the variable-frequency refrigeration system, which is applied to the system for judging the quick leakage of the refrigerant of the variable-frequency refrigeration system and comprises the following steps:
step 1, pre-storing a corresponding relation table of the winding current of a motor inside a compressor and the frequency of the motor inside the compressor, and pre-storing a current difference threshold value under each frequency;
step 2, obtaining the current of a motor winding in the compressor at regular intervals;
step 3, comparing current values obtained at two continuous moments in the certain time interval to generate a current difference under the specified frequency;
and 4, judging whether the current difference is in a prestored current difference threshold range under the specified frequency, if so, indicating that the refrigerant does not leak rapidly, and otherwise, indicating that the refrigerant leaks rapidly.
Further, the current value of the motor winding current at a certain time in the certain time interval is set as idqWherein
Wherein idFor the current motor direct-axis current, iqThe current motor quadrature axis current.
Further, the current value is associated with a specific time and corresponds to a certain frequency.
Further, when rapid leakage of refrigerant occurs, the current idqWill decrease and the change in feedback to the winding temperature is K x idqAnd K is the change rate of the temperature of the motor winding along with the change of the motor current when the motor is at the same frequency.
Further, the current corresponding relationship between the motor winding temperature and the motor winding current is as follows:
wherein phi is0Is the motor flux, T, at the initial operating condition0Is the temperature of the motor winding under the initial working condition,
the current of the motor under the initial working condition is β, the temperature coefficient of the residual magnetism of the motor is phi, the current magnetic flux of the motor is phi, and the current winding temperature of the motor is T.
The system and the method for judging the rapid leakage of the refrigerant of the variable-frequency refrigeration system have the advantages that by comparing current values obtained at two continuous moments in a certain time interval, the current difference under the specified frequency is generated, whether the current difference is within the range of the pre-stored current difference threshold under the specified frequency is judged, if yes, the refrigerant is not rapidly leaked, and otherwise, the refrigerant is rapidly leaked. Therefore, whether the refrigerant of the motor is in a proper range or not can be directly judged, whether quick leakage exists or not can be directly judged, the fault of the refrigerating system can be detected, and particularly the quick leakage of the refrigerant can be well detected.
Drawings
FIG. 1 is a flow chart of a method for determining rapid refrigerant leakage in an inverter refrigeration system according to the present invention.
Detailed Description
The technical scheme of the invention is described in detail in the following with reference to the accompanying drawings.
The invention relates to a system for judging rapid leakage of a refrigerant of a variable-frequency refrigeration system, which consists of a compressor current driving module, a compressor current detection module and a refrigerant leakage judging module, wherein the compressor current driving module is connected with the refrigerant leakage judging module through the compressor current detection module.
In the system, the compressor current driving module is used for driving the compressor internal motor to run at a specified frequency, and the compressor internal motor winding generates current at the frequency; the compressor current detection module is used for acquiring the current of a motor winding in the compressor at regular intervals and transmitting the current to the refrigerant quick leakage judgment module; the refrigerant quick leakage judging module is pre-stored with a corresponding relation table of the winding current of the motor inside the compressor and the frequency of the motor inside the compressor, and a current difference threshold value under each frequency is pre-stored.
When the compressor current detection module transmits the acquired current of the motor winding inside the compressor to the refrigerant quick leakage judgment module, the refrigerant quick leakage judgment module compares current values acquired at two continuous moments in a certain time interval to generate a current difference under the specified frequency, and judges whether the current difference is within a prestored current difference threshold range under the specified frequency, if so, the refrigerant does not have quick leakage, otherwise, the refrigerant has quick leakage.
In the system, in order to be fast and effective when the motor winding current is obtained, the motor winding current can be obtained by detecting the motor winding parameters in the compressor.
In addition, the system can also comprise a frequency detection module, wherein the frequency detection module is connected with the compressor current driving module and the refrigerant quick leakage judging module, and is used for detecting the operating frequency of the motor in the compressor and transmitting the operating frequency to the refrigerant quick leakage judging module.
In addition, the system can also comprise a sharing module, wherein the sharing module is connected with the refrigerant quick leakage judging module, and when the refrigerant quick leakage judging module judges that the refrigerant has quick leakage, the sharing module stores the corresponding data when the refrigerant has quick leakage. And meanwhile, the refrigeration system is stopped.
In addition, the system can also comprise a mobile terminal and a server, wherein the server is used for storing the data in the sharing module, transmitting the data to the mobile terminal and sending the processing information to the mobile terminal.
The invention also provides a method for judging the quick leakage of the refrigerant of the variable-frequency refrigeration system, a flow chart of the method is shown in figure 1, and the method is applied to the system for judging the quick leakage of the refrigerant of the variable-frequency refrigeration system and comprises the following steps:
step 1, pre-storing a corresponding relation table of the winding current of the motor inside the compressor and the frequency of the motor inside the compressor, and pre-storing a current difference threshold value under each frequency.
And 2, acquiring the current of the motor winding in the compressor at regular intervals.
And 3, comparing current values obtained at two continuous moments in a certain time interval to generate a current difference under the specified frequency.
And 4, judging whether the current difference is in a prestored current difference threshold range under the specified frequency, if so, indicating that the refrigerant does not leak rapidly, and otherwise, indicating that the refrigerant leaks rapidly.
In the above method, the current value of the motor winding current at a certain time in the certain time interval may be set to idqWherein
Wherein idFor the current motor direct-axis current, iqThe current motor quadrature axis current.
The current value is associated with a specific time and corresponds to a certain frequency.
When rapid leakage of refrigerant occurs, current idqWill decrease and the change in feedback to the winding temperature is K x idqAnd the quick leakage can be detected more easily, wherein K is the change rate of the temperature of the motor winding along with the change of the motor current when the motor is at the same frequency.
Specifically, the current correspondence between the motor winding temperature and the motor winding current is as follows:
wherein phi is0Is the motor flux, T, at the initial operating condition0Is the temperature of the motor winding under the initial working condition,
the current of the motor under the initial working condition is β, the temperature coefficient of the residual magnetism of the motor is phi, the current magnetic flux of the motor is phi, and the current winding temperature of the motor is T.
In practice, a certain driving frequency, such as 55Hz, is first fixed, and a temperature sensor is provided, each at a fixed time interval, such as 1 second, also 200 mm or 500 mm, to verify the correctness and technical effect of the test method. According to the verification result, whether the rapid leakage exists can be determined within 4 seconds at the maximum when the winding temperature is calculated, and the rapid leakage can be detected within 1 second in the operation process.
Claims (10)
1. The judgment system for the rapid leakage of the refrigerant of the variable-frequency refrigeration system is characterized by comprising a compressor current driving module, a compressor current detection module and a refrigerant leakage judgment module, wherein the compressor current driving module is connected with the refrigerant leakage judgment module through the compressor current detection module;
the compressor current driving module is used for driving a motor inside the compressor to run at a specified frequency, and a motor winding inside the compressor generates current at the frequency;
the compressor current detection module is used for acquiring the current of a motor winding in the compressor at regular intervals and transmitting the current to the refrigerant quick leakage judgment module;
the refrigerant quick leakage judging module is pre-stored with a corresponding relation table of the winding current of the motor inside the compressor and the frequency of the motor inside the compressor, and a current difference threshold value under each frequency is pre-stored;
when the compressor current detection module transmits the acquired current of the motor winding inside the compressor to the refrigerant quick leakage judgment module, the refrigerant quick leakage judgment module compares current values acquired at two continuous moments in a certain time interval to generate a current difference under the specified frequency, and judges whether the current difference is within a prestored current difference threshold range under the specified frequency, if so, the refrigerant does not have quick leakage, otherwise, the refrigerant has quick leakage.
2. The system for determining rapid refrigerant leak in an inverter refrigeration system as set forth in claim 1, wherein the motor winding current is obtained by detecting a parameter of the motor winding inside the compressor.
3. The system for determining the rapid refrigerant leakage of the inverter refrigeration system according to claim 1, further comprising a frequency detection module, wherein the frequency detection module is connected to the compressor current driving module and the refrigerant rapid leakage determination module, and is configured to detect an operating frequency of a motor inside the compressor and transmit the operating frequency to the refrigerant rapid leakage determination module.
4. The system for determining the rapid refrigerant leakage of the inverter refrigeration system according to claim 1, further comprising a sharing module, wherein the sharing module is connected to the rapid refrigerant leakage determination module, and when the rapid refrigerant leakage determination module determines that the rapid refrigerant leakage occurs, the sharing module stores data corresponding to the rapid refrigerant leakage.
5. The system for determining rapid refrigerant leakage in an inverter refrigeration system according to claim 1 or 4, further comprising a mobile terminal and a server, wherein the server is configured to store data in the shared module, transmit the data to the mobile terminal, and send processing information to the mobile terminal.
6. The method for judging the quick refrigerant leakage of the variable-frequency refrigeration system is applied to the system for judging the quick refrigerant leakage of the variable-frequency refrigeration system as claimed in any one of claims 1 to 5, and is characterized by comprising the following steps of:
step 1, pre-storing a corresponding relation table of the winding current of a motor inside a compressor and the frequency of the motor inside the compressor, and pre-storing a current difference threshold value under each frequency;
step 2, obtaining the current of a motor winding in the compressor at regular intervals;
step 3, comparing current values obtained at two continuous moments in the certain time interval to generate a current difference under the specified frequency;
and 4, judging whether the current difference is in a prestored current difference threshold range under the specified frequency, if so, indicating that the refrigerant does not leak rapidly, and otherwise, indicating that the refrigerant leaks rapidly.
7. The method for determining rapid refrigerant leak in inverter refrigeration system according to claim 6, wherein the current value of the motor winding current at a certain time in the certain time interval is set as idqWherein
Wherein idFor the current motor direct-axis current, iqThe current motor quadrature axis current.
8. The method of claim 7, wherein the current value is associated with a specific time and corresponds to a certain frequency.
9. The method for determining rapid refrigerant leakage in inverter refrigeration system according to claim 7 or 8, wherein when rapid refrigerant leakage occurs, the current i is set todqWill decrease and the change in feedback to the winding temperature is K x idqAnd K is the change rate of the temperature of the motor winding along with the change of the motor current when the motor is at the same frequency.
10. The method for determining rapid refrigerant leak in an inverter refrigeration system according to claim 9, wherein the current motor winding temperature and motor winding current correspond to the following relationship:
wherein phi is0Is the motor flux, T, at the initial operating condition0Is the temperature of the motor winding under the initial working condition,
the current of the motor under the initial working condition is β, the temperature coefficient of the residual magnetism of the motor is phi, the current magnetic flux of the motor is phi, and the current winding temperature of the motor is T.
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| CN109631229A (en) * | 2019-01-31 | 2019-04-16 | 四川长虹空调有限公司 | The determination method of refrigeration system refrigerant fast leak |
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