CN114459123B - Compressor efficiency decline detection method and device, storage medium and air conditioning unit - Google Patents
Compressor efficiency decline detection method and device, storage medium and air conditioning unit Download PDFInfo
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- CN114459123B CN114459123B CN202210141666.3A CN202210141666A CN114459123B CN 114459123 B CN114459123 B CN 114459123B CN 202210141666 A CN202210141666 A CN 202210141666A CN 114459123 B CN114459123 B CN 114459123B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 11
- 238000001514 detection method Methods 0.000 title claims description 31
- 230000007423 decrease Effects 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000015556 catabolic process Effects 0.000 claims description 30
- 238000006731 degradation reaction Methods 0.000 claims description 30
- 238000013507 mapping Methods 0.000 claims description 25
- 238000012549 training Methods 0.000 claims description 14
- 230000009467 reduction Effects 0.000 abstract description 15
- 230000008859 change Effects 0.000 abstract description 11
- 229920006395 saturated elastomer Polymers 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005057 refrigeration Methods 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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 discloses a method and a device for detecting efficiency reduction of a compressor, a storage medium and an air conditioning unit, wherein the method comprises the following steps: acquiring the current exhaust pressure and the current return air pressure of the compressor, and acquiring the current running current of the compressor; determining a current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining a current return air saturation temperature of the compressor according to the current return air pressure, and determining a current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature; and detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current. Therefore, whether the efficiency of the compressor is reduced or not is judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is in fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
Description
Technical Field
The present invention relates to the field of compressor failure detection, and in particular, to a method for detecting a decrease in efficiency of a compressor, a computer readable storage medium, an air conditioning unit, and a device for detecting a decrease in efficiency of a compressor.
Background
The compressor is a core component of the refrigeration system, once the compressor damages the whole refrigeration system, the refrigeration system is stopped, immeasurable loss is caused once the refrigeration system is stopped, the compressor is damaged, the maintenance is difficult and the cost is high, especially after the compressor has soft faults, the efficiency value of the compressor is reduced, the energy consumption is increased, and the operation reliability of the compressor and even the refrigeration system is further affected. Therefore, it is important to pay attention to the health of the compressor in real time.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a method for detecting efficiency degradation of a compressor, which can accurately determine the efficiency degradation of the compressor after failure in time, and ensure the reliability and stability of the operation of the compressor.
A second object of the present invention is to propose a computer readable storage medium.
A third object of the present invention is to propose an air conditioning unit.
A fourth object of the present invention is to provide a compressor efficiency degradation detection device.
In order to achieve the above object, a method for detecting a decrease in efficiency of a compressor according to an embodiment of a first aspect of the present invention includes the steps of: acquiring the current exhaust pressure and the current return air pressure of a compressor, and acquiring the current running current of the compressor; determining a current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining a current return air saturation temperature of the compressor according to the current return air pressure, and determining a current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature; and detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current.
According to the method for detecting the efficiency drop of the compressor, the current exhaust pressure and the current return air pressure of the compressor are obtained, the current running current of the compressor is obtained, then the current exhaust saturated temperature of the compressor is determined according to the current exhaust pressure, the current return air saturated temperature of the compressor is determined according to the current return air pressure, the current reference current of the compressor is determined according to the current exhaust saturated temperature and the current return air saturated temperature, and further whether the efficiency drop of the compressor is detected according to the current reference current and the current running current. Therefore, whether the efficiency of the compressor is reduced or not is judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is in fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
In addition, the method for detecting the efficiency drop of the compressor according to the embodiment of the invention can also have the following additional technical characteristics:
According to one embodiment of the invention, determining a current reference current for the compressor from the current discharge saturation temperature and the current return saturation temperature comprises: obtaining a mapping relation between the reference current of the compressor and the exhaust saturation temperature and the return saturation temperature of the compressor; and determining the current reference current of the compressor according to the current exhaust saturation temperature, the current return air saturation temperature and the mapping relation.
According to one embodiment of the present invention, obtaining a mapping relationship between a reference current of the compressor and a discharge saturation temperature and a return saturation temperature of the compressor includes: determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor; determining an exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining a return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor; and establishing the mapping relation according to the exhaust saturation temperature and the return air saturation temperature when the compressor normally operates and the working current when the compressor normally operates.
According to one embodiment of the invention, determining a current reference current for the compressor from the current discharge saturation temperature and the current return saturation temperature comprises: determining a pre-trained compressor current model; and inputting the current exhaust saturation temperature and the current return air saturation temperature into the compressor current model to obtain the current reference current.
According to one embodiment of the invention, determining a pre-trained compressor current model includes: determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor; determining an exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining a return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor; and training the compressor current model according to the exhaust saturation temperature and the return air saturation temperature when the compressor normally operates and the working current when the compressor normally operates.
According to one embodiment of the present invention, detecting whether the compressor efficiency is reduced based on the present reference current and the present operating current includes: determining a current difference between the current operating current and the current reference current; and determining that the efficiency of the compressor is reduced when the current difference value is larger than a preset current threshold value.
According to one embodiment of the invention, when the current difference value is smaller than or equal to a preset current threshold value, the normal operation of the compressor is determined, the current exhaust saturation temperature, the current return air saturation temperature and the current operation current are added into a training sample set, and the training of the current electric motor model is continued.
To achieve the above object, an embodiment of a second aspect of the present invention provides a computer-readable storage medium having stored thereon a compressor efficiency degradation detection program, which when executed by a processor, implements a compressor efficiency degradation detection method according to the embodiment of the first aspect.
According to the computer readable storage medium, by executing the compressor efficiency drop detection program, whether the compressor is subjected to efficiency drop can be judged through the current change condition of the compressor, so that the efficiency drop after the compressor is in failure can be timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
In order to achieve the above object, an air conditioning unit according to an embodiment of the third aspect of the present invention includes a memory, a processor, and a compressor efficiency degradation detection program stored in the memory and capable of running on the processor, where the processor implements the compressor efficiency degradation detection method according to the embodiment of the first aspect when executing the compressor efficiency degradation detection program.
According to the air conditioning unit provided by the embodiment of the invention, by executing the compressor efficiency reduction detection program, whether the compressor is subjected to efficiency reduction or not can be judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is subjected to fault is timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
In order to achieve the above object, a compressor efficiency degradation detection device according to a fourth aspect of the present invention includes: the first acquisition module is used for acquiring the current exhaust pressure and the current return air pressure of the compressor; the second acquisition module is used for acquiring the current running current of the compressor; the determining module is used for determining the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return air saturation temperature of the compressor according to the current return air pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature; and the detection module is used for detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current.
According to the compressor efficiency reduction detection device, the current exhaust pressure and the current return air pressure of the compressor are obtained through the first obtaining module, the current running current of the compressor is obtained through the second obtaining module, then the current exhaust saturated temperature of the compressor is determined through the determining module according to the current exhaust pressure, the current return air saturated temperature of the compressor is determined according to the current return air pressure, the current reference current of the compressor is determined according to the current exhaust saturated temperature and the current return air saturated temperature, and further whether the efficiency of the compressor is reduced or not is detected through the detection module according to the current reference current and the current running current. Therefore, whether the efficiency of the compressor is reduced or not is judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is in fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for detecting a decrease in efficiency of a compressor according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting compressor efficiency degradation according to one embodiment of the present invention;
FIG. 3 is a flow chart of a method for detecting compressor efficiency degradation according to one embodiment of the present invention;
FIG. 4 is a flow chart of a method for detecting compressor efficiency degradation according to another embodiment of the present invention;
FIG. 5 is a flow chart of a method for detecting compressor efficiency degradation according to another embodiment of the present invention;
FIG. 6 is a flow chart of a compressor efficiency degradation detection method according to one embodiment of the present invention;
Fig. 7 is a block schematic diagram of a compressor efficiency degradation detection apparatus according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A compressor efficiency degradation detection method, a computer-readable storage medium, an air conditioning unit, and a compressor efficiency degradation detection apparatus according to embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a flow chart illustrating a method for detecting a decrease in efficiency of a compressor according to an embodiment of the present invention.
As shown in fig. 1, the compressor efficiency degradation detection method includes the steps of:
s101, acquiring the current exhaust pressure and the current return air pressure of the compressor, and acquiring the current running current of the compressor.
For example, in the embodiment of the present invention, the current discharge pressure Pdd of the compressor in actual operation may be obtained by a discharge port pressure sensor provided at a discharge port of the compressor, the current return air pressure Psd of the compressor in actual operation may be obtained by a return air port pressure sensor provided at a return air port of the compressor, and the current operation current Id of the compressor in actual operation may be obtained by a current sensor provided at the compressor.
S102, determining the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return air saturation temperature of the compressor according to the current return air pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature.
For example, in the embodiment of the present invention, after the current discharge pressure Pdd at the time of actually operating the compressor is obtained by the discharge port pressure sensor provided at the discharge port of the compressor, and the current return air pressure Pdd at the time of actually operating the compressor is obtained by the return air port pressure sensor provided at the return air port of the compressor, the current discharge saturation temperature Tpdd at the time of actually operating the compressor may be determined according to the current discharge pressure Psd at the time of actually operating the compressor, the current return air saturation temperature Tpsd at the time of actually operating the compressor may be obtained according to the current return air pressure Psd at the time of actually operating the compressor, and then the current reference current Ib at the time of actually operating the compressor may be determined according to the current discharge saturation temperature Tpdd at the time of actually operating the compressor and the current return air saturation temperature Tpsd at the time of actually operating the compressor.
S103, detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current.
It should be understood that in the embodiment of the present invention, whether the compressor efficiency is reduced may be detected according to the current reference current Ib when the compressor actually operates and according to the current operating current Id when the compressor actually operates, so as to determine whether the compressor efficiency is reduced according to the current change condition of the compressor, and timely and accurately determine the efficiency reduction after the compressor fails, thereby ensuring the reliability and stability of the operation of the compressor.
Further, as shown in fig. 2, in one embodiment of the present invention, determining a current reference current of the compressor according to a current discharge saturation temperature and a current return saturation temperature includes:
s201, obtaining a mapping relation between a reference current of the compressor and exhaust saturation temperature and return saturation temperature of the compressor.
Specifically, as shown in fig. 3, obtaining a mapping relationship between a reference current of a compressor and an exhaust saturation temperature and an return saturation temperature of the compressor includes:
s301, determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor.
For example, in the embodiment of the present invention, when the compressor is operating normally, the state information of the compressor may be determined, and the compressor discharge pressure Pd when the compressor is operating normally, the compressor return pressure Ps when the compressor is operating normally, and the compressor operating current I when the compressor is operating normally are obtained for determination.
S302, determining the exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining the return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor.
For example, in the embodiment of the present invention, after the compressor discharge pressure Pd at the time of normal operation and the compressor return air pressure Ps at the time of normal operation are determined, the compressor discharge saturation temperature Tpd at the time of normal operation may be determined from the compressor discharge pressure Pd at the time of normal operation, and the compressor return air saturation temperature Tps at the time of normal operation may be determined from the compressor return air pressure Ps at the time of normal operation.
S303, establishing a mapping relation according to the exhaust saturation temperature and the return air saturation temperature when the compressor normally operates and the working current when the compressor normally operates.
Specifically, in the embodiment of the present invention, a corresponding map may be established according to the compressor discharge air saturation temperature Tpd during normal operation and the compressor return air saturation temperature Tps during normal operation, and the compressor operating current I during normal operation, for example, the map may include that each group of the compressor discharge air saturation temperature Tpd and the compressor return air saturation temperature Tps during normal operation may correspond to the compressor operating current I during normal operation of one compressor, respectively.
Therefore, in the normal operation process of the compressor, the mapping relation between the exhaust saturation temperature Tpd and the return saturation temperature Tps of the compressor in normal operation and the working current I of the compressor in normal operation can be established according to the state information of the compressor in normal operation.
S202, determining the current reference current of the compressor according to the current exhaust saturation temperature, the current return air saturation temperature and the mapping relation.
That is, in the embodiment of the present invention, the current reference current Ib at the time of actual operation of the compressor may be determined according to the current exhaust gas saturation temperature Tpdd at the time of actual operation and the current return gas saturation temperature Tpsd at the time of actual operation, in combination with the aforementioned mapping relationship between the compressor exhaust gas saturation temperature Tpd at the time of normal operation and the compressor return gas saturation temperature Tps at the time of normal operation, and the compressor operating current I at the time of normal operation.
Specifically, in one embodiment of the present invention, the exhaust saturation temperature Tpd of the compressor in normal operation corresponding to the current exhaust saturation temperature Tpdd of the compressor in actual operation may be found from the mapping relation by means of table lookup, the exhaust saturation temperature Tpd of the compressor in normal operation corresponding to the current return saturation temperature Tpsd of the compressor in actual operation may be found, the current values corresponding to the exhaust saturation temperature Tpd of the compressor in normal operation and the exhaust saturation temperature Tpd of the compressor in normal operation may be found from the mapping relation, and then the current value may be determined as the current reference current Ib of the compressor in actual operation.
Therefore, in the actual running process of the compressor, the current reference current Ib of the compressor in actual running can be determined according to the current exhaust saturation temperature Tpdd of the compressor in actual running and the current return saturation temperature Tpsd of the compressor in actual running, and in combination with the mapping relation established by the exhaust saturation temperature Tpd of the compressor in normal running, the return saturation temperature Tps of the compressor in normal running and the working current I of the compressor in normal running.
Further, as shown in fig. 4, in another embodiment of the present invention, determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature includes:
S401, determining a pre-trained compressor current model.
Specifically, as shown in fig. 5, determining a pre-trained compressor current model includes:
S501, determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor.
For example, in the embodiment of the present invention, the state information of the compressor may be determined when the compressor is operating normally, so as to obtain the compressor discharge pressure Pd when the compressor is operating normally, the compressor return pressure Ps when the compressor is operating normally, and the compressor operating current I when the compressor is operating normally.
S502, determining the exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining the return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor.
For example, in the embodiment of the present invention, after the compressor discharge pressure Pd at the time of normal operation of the compressor and the compressor return air pressure Ps at the time of normal operation of the compressor are determined, the compressor discharge saturation temperature Tpd at the time of normal operation of the compressor may be determined based on the compressor discharge pressure Pd at the time of normal operation, and the compressor return air saturation temperature Tps at the time of normal operation may be determined based on the compressor return air pressure Ps at the time of normal operation.
S503, training a compressor current model according to the exhaust saturation temperature and the return saturation temperature of the compressor in normal operation and the working current of the compressor in normal operation.
That is, in the embodiment of the present invention, the compressor current model may be trained based on the compressor discharge saturation temperature Td and the compressor return saturation temperature Ts at the normal operation, and the compressor operating current I at the normal operation.
S402, inputting the current exhaust saturation temperature and the current return air saturation temperature into a compressor current model to obtain the current reference current.
That is, in the embodiment of the present invention, the current discharge saturation temperature Tpdd at the time of the actual operation of the compressor and the current return saturation temperature Tpsd at the time of the actual operation of the compressor may be input into the aforementioned compressor current model to obtain the current reference current Ib at the time of the actual operation of the compressor from the compressor current model.
Specifically, in one embodiment of the present invention, the compressor current model may directly calculate and obtain the current reference current Ib when the compressor is actually operated according to the current exhaust saturation temperature Tpdd when the compressor is actually operated and the current return saturation temperature Tpsd when the compressor is actually operated.
Therefore, in the actual operation process of the compressor, the current reference current Ib of the compressor in the actual operation process of the compressor can be determined according to the current exhaust saturation temperature Tpdd of the compressor in the actual operation process and the current return saturation temperature Tpsd of the compressor in the actual operation process of the compressor in combination with the trained compressor current model.
Further, as shown in fig. 6, detecting whether the efficiency of the compressor is reduced according to the present reference current and the present operation current includes:
S601, determining a current difference value between the current running current and the current reference current.
It should be understood that, in the embodiment of the present invention, after determining the current reference current Ib of the compressor, the current difference Δi between the current operation current Id and the current reference current Ib may be determined according to the current operation current Id of the compressor in actual operation and the current reference current Ib of the compressor in actual operation.
S602, determining that the efficiency of the compressor is reduced when the current difference value is larger than a preset current threshold value.
That is, in the embodiment of the present invention, if the current difference Δi between the compressor present operation current Id when the compressor is actually operated and the compressor present reference current Ib when the compressor is actually operated is greater than the preset current threshold value, it may be determined that the compressor efficiency is decreased.
Alternatively, the preset current threshold may be set accordingly according to the model of the compressor.
In addition, in some embodiments of the present invention, after determining that the efficiency of the compressor is reduced, the compressor may be controlled to reduce a current difference Δi between a current operating current Id when the compressor is actually operated and a current reference current Ib when the compressor is actually operated, and at the same time, fault prompting information may be sent to prompt a user to timely maintain and overhaul the compressor.
Therefore, when the current difference delta I between the current running current Id of the compressor and the current reference current Ib of the compressor is larger than a preset current threshold value, the occurrence of efficiency reduction of the compressor is judged, so that the efficiency reduction after the compressor is in failure is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
Further, when the current difference value is smaller than or equal to a preset current threshold value, normal operation of the compressor is determined, the current exhaust saturation temperature, the current return air saturation temperature and the current operation current are added into a training sample set, and the compressor current model is continuously trained.
It will be appreciated that in embodiments of the present invention, if the current difference Δi is less than or equal to a preset current threshold, it may be determined that the compressor is operating properly.
In addition, the current exhaust saturation temperature Tpdd of the compressor, the current return saturation temperature Tpsd of the compressor and the current running current I of the compressor can be further added into a training sample set to train the compressor current model continuously according to the training sample set, so that the fitting degree of the compressor current model and the compressor is improved, and the accuracy of the efficiency reduction detection of the compressor is further improved.
It should be understood that, in the method for detecting efficiency of a compressor according to the embodiment of the present invention, the efficiency value of the compressor is usually indirectly characterized only by the evaporating pressure, the condensing pressure, the discharge pressure of the compressor, the discharge temperature of the compressor, the pressure of the refrigerant leaving the condenser, the temperature of the refrigerant leaving the condenser, the suction temperature of the compressor, the operating frequency of the compressor, the work consumption of the compressor, the water temperature of the cooling water inlet, the water temperature of the cooling water outlet, the flow rate of the cooling water, and the like, and the parameters are all very easily affected by the external environment, so that there is a large error in timeliness and accuracy of the calculated efficiency value of the compressor.
In summary, according to the method for detecting the efficiency drop of the compressor according to the embodiment of the present invention, firstly, the current exhaust pressure of the compressor in actual operation and the current return air pressure of the compressor in actual operation can be obtained, and the current operating current of the compressor in actual operation is obtained, then, the current exhaust saturation temperature of the compressor in actual operation is determined according to the obtained current exhaust pressure of the compressor in actual operation, and the current return air saturation temperature of the compressor in actual operation is determined according to the obtained current return air pressure of the compressor in actual operation, and the current reference current in actual operation is determined according to the current exhaust saturation temperature of the compressor in actual operation and the current return air saturation temperature of the compressor, and further, whether the efficiency drop of the compressor is detected according to the current reference current of the compressor in actual operation and the current operating current of the compressor in actual operation is detected. Therefore, whether the efficiency of the compressor is reduced or not is judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is in fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
Based on the foregoing method for detecting the efficiency drop of the compressor according to the embodiment of the present invention, the embodiment of the present invention further provides a computer readable storage medium, which can implement a specific implementation of the method for detecting the efficiency drop of the compressor according to the foregoing embodiment of the present invention, so that redundancy is reduced, and no further description is given here.
In summary, according to the computer readable storage medium of the embodiment of the present invention, the efficiency degradation detection program stored on the computer readable storage medium is executed by the executor, so that whether the efficiency degradation of the compressor occurs can be determined through the current change condition of the compressor, thereby timely and accurately determining the efficiency degradation after the compressor fails, and ensuring the reliability and stability of the operation of the compressor.
Based on the foregoing method for detecting the efficiency drop of the compressor according to the embodiment of the present invention, the embodiment of the present invention further provides an air conditioning unit, which can implement a specific implementation of the foregoing method for detecting the efficiency drop of the compressor according to the embodiment of the present invention, so that redundancy is reduced, and no further description is given here.
In summary, according to the air conditioning unit provided by the embodiment of the invention, the efficiency drop detection program of the compressor stored in the memory is executed by the executor, and whether the efficiency drop of the compressor occurs can be judged through the current change condition of the compressor, so that the efficiency drop after the compressor fails can be timely and accurately judged, and the reliability and stability of the operation of the compressor are ensured.
Fig. 7 is a block schematic diagram of a compressor efficiency degradation detection apparatus according to an embodiment of the present invention.
As shown in fig. 7, the compressor efficiency degradation detection device 100 includes: the device comprises a first acquisition module 10, a second acquisition module 20, a determination module 30 and a detection module 40.
Specifically, the first obtaining module 10 may be configured to obtain a current discharge pressure when the compressor is actually operated, and a current return air pressure when the compressor is actually operated; the second obtaining module 20 may be configured to obtain a current running current when the compressor is actually running; the determining module 30 may be configured to determine a current exhaust saturation temperature of the compressor when the compressor is actually operated according to a current exhaust pressure of the compressor when the compressor is actually operated, determine a current return air saturation temperature of the compressor when the compressor is actually operated according to a current return air pressure of the compressor when the compressor is actually operated, and determine a current reference current of the compressor when the compressor is actually operated according to the current exhaust saturation temperature and the current return air saturation temperature of the compressor when the compressor is actually operated; the detection module 40 may be used to detect whether the compressor efficiency is degraded based on the current reference current when the compressor is actually operated and the current operation current when the compressor is actually operated.
Specifically, in one embodiment of the present invention, the first acquisition module 10 may acquire the current discharge pressure at which the compressor is actually operated by a discharge port pressure sensor provided at a discharge port of the compressor, and acquire the current return air pressure at which the compressor is actually operated by a return air port pressure sensor provided at a return air port of the compressor, and the second acquisition module 20 may acquire the current operation current at which the compressor is actually operated by providing a current sensor.
Then, after the first obtaining module 10 obtains the current exhaust pressure when the compressor actually operates through the exhaust port pressure sensor provided at the exhaust port of the compressor and obtains the current return air pressure when the compressor actually operates through the return air port pressure sensor provided at the return air port of the compressor, the determining module 30 may determine the current exhaust saturation temperature when the compressor actually operates according to the current exhaust pressure when the compressor actually operates and obtain the current return air saturation temperature when the compressor actually operates according to the current return air pressure when the compressor actually operates, and then determine the current reference current when the compressor actually operates according to the current exhaust saturation temperature when the compressor actually operates and the current return air saturation temperature when the compressor actually operates.
Furthermore, the detection module 40 can detect whether the compressor efficiency is reduced according to the current reference current of the compressor in actual operation and the current operation current in actual operation, which are determined by the determination module 30, so as to determine whether the compressor efficiency is reduced according to the current change condition of the compressor, and timely and accurately determine the efficiency reduction after the compressor is failed, thereby ensuring the reliability and stability of the operation of the compressor.
Further, the determining module 30 is further configured to obtain a mapping relationship between a current reference current of the compressor in actual operation and a current exhaust saturation temperature and a current return saturation temperature of the compressor in actual operation, and determine the current reference current of the compressor in actual operation according to the current exhaust saturation temperature and the current return saturation temperature of the compressor in actual operation and the mapping relationship.
That is, in an embodiment of the present invention, the determining module 30 may determine the current reference current when the compressor actually operates according to the current exhaust gas saturation temperature when actually operating and the current return gas saturation temperature when actually operating, in combination with the aforementioned compressor exhaust gas saturation temperature when normally operating and compressor return gas saturation temperature when normally operating, and the mapping relationship between the compressor operating currents when normally operating.
Specifically, in one embodiment of the present invention, the determining module 30 may first find the exhaust saturation temperature of the compressor in normal operation corresponding to the current exhaust saturation temperature of the compressor in actual operation from the mapping relationship by means of table lookup, find the exhaust saturation temperature of the compressor in normal operation corresponding to the current return air saturation temperature of the compressor in actual operation, find the current value corresponding to the exhaust saturation temperature of the compressor in normal operation and the exhaust saturation temperature of the compressor in normal operation from the mapping relationship, and then determine the current value as the current reference current of the compressor in actual operation.
Further, the determining module 30 is further configured to determine compressor status information during normal operation, where the status information includes a compressor discharge pressure during normal operation, a compressor return air pressure during normal operation, and a compressor operating current during normal operation, determine a compressor discharge saturation temperature during normal operation according to the compressor discharge pressure during normal operation, determine a compressor return air saturation temperature during normal operation according to the compressor return air pressure during normal operation, and then establish a mapping relationship according to the compressor discharge saturation temperature during normal operation, the compressor return air saturation temperature, and the compressor operating current during normal operation.
Specifically, in the embodiment of the present invention, a mapping relationship may be established according to the compressor discharge saturation temperature during normal operation and the compressor return air saturation temperature during normal operation, and the compressor operating current during normal operation, for example, the mapping relationship may include that each group of compressor discharge saturation temperature and the compressor return air saturation temperature during normal operation may respectively correspond to the compressor operating current during normal operation.
Further, the determining module 30 is further configured to determine a pre-trained compressor current model, and then input a current exhaust saturation temperature of the compressor in normal operation and a current return saturation temperature of the compressor in normal operation into the compressor current model to obtain a current reference current of the compressor in actual operation.
Specifically, in another embodiment of the present invention, the determining module 30 may calculate and obtain the current reference current of the actual operation of the compressor directly according to the current exhaust saturation temperature of the actual operation of the compressor and the current return air saturation temperature of the actual operation of the compressor through a pre-trained compressor current model.
Further, the determining module 30 is further configured to determine compressor status information during normal operation, where the status information includes a compressor discharge pressure, a compressor return air pressure, and a compressor operating current during normal operation, determine a compressor discharge saturation temperature during normal operation based on the compressor discharge pressure during normal operation, and determine a compressor return air saturation temperature during normal operation based on the compressor return air pressure during normal operation, and then train the compressor current model based on the compressor discharge saturation temperature and the compressor return air saturation temperature during normal operation, and the compressor operating current during normal operation.
That is, in an embodiment of the present invention, the determination module 30 may train the compressor current model based on the compressor discharge saturation temperature during normal operation and the compressor return saturation temperature during normal operation, as well as the compressor operating current during normal operation.
Further, the detection module 40 is further configured to determine a current difference between a current running current of the compressor in actual operation and a current reference current of the compressor in actual operation, and determine that the compressor efficiency is reduced when the current difference between the current running current of the compressor in actual operation and the current reference current of the compressor in actual operation is greater than a preset current threshold.
Alternatively, the preset current threshold may be set accordingly according to the model of the compressor.
In addition, in some embodiments of the present invention, after determining that the efficiency of the compressor is reduced, the compressor may be controlled to reduce a current difference between current reference currents of current operation currents of the compressor when the compressor is actually operated, and at the same time, fault prompting information may be sent to prompt a user to timely maintain and overhaul the compressor.
Further, the detection module 40 is further configured to determine that the compressor is operating normally when a current difference between a current operating current during actual operation and a current reference current during actual operation of the compressor is less than or equal to a preset current threshold, and add a current discharge saturation temperature of the compressor during actual operation and a current return saturation temperature of the compressor during actual operation, and the current operating current of the compressor during actual operation to the training sample set, and continue training the compressor current model.
It is appreciated that in embodiments of the present invention, the detection module 40 may determine that the compressor is operating properly if the current difference is less than or equal to a preset current threshold.
In addition, the current exhaust saturation temperature, the current return saturation temperature and the current running current of the compressor can be further added into a training sample set to train the compressor current model continuously according to the training sample set, so that the fitting degree of the compressor current model and the compressor is improved, and the accuracy of detecting the efficiency decline of the compressor is further improved.
It should be understood that, in the prior art, the efficiency value of the compressor is usually indirectly characterized only by the evaporating pressure, the condensing pressure, the discharge pressure of the compressor, the discharge temperature of the compressor, the pressure of the refrigerant leaving the condenser, the temperature of the refrigerant leaving the condenser, the suction temperature of the compressor, the operating frequency of the compressor, the work consumption of the compressor, the water temperature of the cooling water inlet, the water temperature of the cooling water outlet, the flow rate of the cooling water, and the like, and all the parameters are easily affected by the external environment, so that the calculated efficiency value of the compressor has larger errors in timeliness and accuracy, therefore, in the compressor efficiency detecting device of the embodiment of the present invention, the determining module 30 constructs a relation or model between the discharge saturation temperature of the compressor, the return saturation temperature of the compressor and the current reference value in advance, so as to directly and effectively detect whether the efficiency of the compressor is reduced according to the current reference value and the current operating current of the compressor under the actual working condition, thereby improving the timeliness and accuracy of the detection of the efficiency value of the compressor.
In summary, according to the compressor efficiency degradation detection device provided by the embodiment of the invention, the current exhaust pressure of the compressor in actual operation and the current return air pressure of the compressor in actual operation are obtained through the first obtaining module, the current operation current of the compressor in actual operation is obtained through the second obtaining module, then the current exhaust saturation temperature of the compressor in actual operation is determined through the determining module according to the current exhaust pressure of the compressor in actual operation, the current return air saturation temperature of the compressor in actual operation is determined according to the current return air pressure of the compressor in actual operation, the current reference current of the compressor in actual operation is determined according to the current exhaust saturation temperature of the compressor in actual operation and the current return air saturation temperature of the compressor in actual operation, and further whether the efficiency of the compressor is degraded or not is detected through the detecting module according to the current reference current of the compressor in actual operation and the current operation current of the compressor. Therefore, whether the efficiency of the compressor is reduced or not is judged through the current change condition of the compressor, so that the efficiency reduction after the compressor is in fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A method for detecting a decrease in efficiency of a compressor, the method comprising the steps of:
acquiring the current exhaust pressure and the current return air pressure of a compressor, and acquiring the current running current of the compressor;
Determining a current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining a current return air saturation temperature of the compressor according to the current return air pressure, and determining a current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature;
detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current;
Detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current comprises the following steps:
determining a current difference between the current operating current and the current reference current;
And determining that the efficiency of the compressor is reduced when the current difference value is larger than a preset current threshold value.
2. The method of claim 1, wherein determining a current reference current for the compressor based on the current discharge saturation temperature and the current return saturation temperature comprises:
obtaining a mapping relation between the reference current of the compressor and the exhaust saturation temperature and the return saturation temperature of the compressor;
And determining the current reference current of the compressor according to the current exhaust saturation temperature, the current return air saturation temperature and the mapping relation.
3. The method of claim 2, wherein obtaining a mapping between the reference current of the compressor and the discharge saturation temperature and the return saturation temperature of the compressor comprises:
determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor;
Determining an exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining a return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor;
and establishing the mapping relation according to the exhaust saturation temperature and the return air saturation temperature when the compressor normally operates and the working current when the compressor normally operates.
4. The method of claim 1, wherein determining a current reference current for the compressor based on the current discharge saturation temperature and the current return saturation temperature comprises:
determining a pre-trained compressor current model;
and inputting the current exhaust saturation temperature and the current return air saturation temperature into the compressor current model to obtain the current reference current.
5. The method of claim 4, wherein determining a pre-trained compressor current model comprises:
determining state information of the compressor in normal operation, wherein the state information comprises discharge pressure, return pressure and working current of the compressor;
Determining an exhaust saturation temperature of the compressor in normal operation according to the exhaust pressure of the compressor, and determining a return air saturation temperature of the compressor in normal operation according to the return air pressure of the compressor;
and training the compressor current model according to the exhaust saturation temperature and the return air saturation temperature when the compressor normally operates and the working current when the compressor normally operates.
6. The method of claim 5, wherein when the current difference is less than or equal to a preset current threshold, determining that the compressor is operating normally, and adding the current discharge saturation temperature and the current return saturation temperature, and the current operating current to a training sample set, continuing training the current model.
7. A computer-readable storage medium, characterized in that a compressor efficiency degradation detection program is stored thereon, which when executed by a processor, implements the compressor efficiency degradation detection method according to any one of claims 1 to 6.
8. An air conditioning unit comprising a memory, a processor and a compressor efficiency degradation detection program stored on the memory and operable on the processor, wherein the processor, when executing the compressor efficiency degradation detection program, implements the compressor efficiency degradation detection method according to any one of claims 1-6.
9. A compressor efficiency degradation detection apparatus, the apparatus comprising:
the first acquisition module is used for acquiring the current exhaust pressure and the current return air pressure of the compressor;
The second acquisition module is used for acquiring the current running current of the compressor;
the determining module is used for determining the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return air saturation temperature of the compressor according to the current return air pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return air saturation temperature;
The detection module is used for detecting whether the efficiency of the compressor is reduced according to the current reference current and the current running current;
The detection module is further used for determining a current difference value between the current running current and the current reference current; and determining that the efficiency of the compressor is reduced when the current difference value is larger than a preset current threshold value.
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| CN110529979A (en) * | 2019-09-12 | 2019-12-03 | 宁波奥克斯电气股份有限公司 | A kind of motor control method, device and air conditioner |
| CN111120290A (en) * | 2019-12-19 | 2020-05-08 | 广东申菱环境系统股份有限公司 | Overload protection method and overload protection device for compressor |
| CN117665460A (en) * | 2023-12-09 | 2024-03-08 | 上海耀杉电子科技有限公司 | Method and system for detecting internal abrasion state of compressor |
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| US4269156A (en) * | 1979-05-01 | 1981-05-26 | The Bendix Corporation | Air/fuel ratio management system with calibration correction for manifold pressure differentials |
| JP2012189246A (en) * | 2011-03-09 | 2012-10-04 | Hitachi Appliances Inc | Refrigerating apparatus |
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| CN110529979A (en) * | 2019-09-12 | 2019-12-03 | 宁波奥克斯电气股份有限公司 | A kind of motor control method, device and air conditioner |
| CN111120290A (en) * | 2019-12-19 | 2020-05-08 | 广东申菱环境系统股份有限公司 | Overload protection method and overload protection device for compressor |
| CN117665460A (en) * | 2023-12-09 | 2024-03-08 | 上海耀杉电子科技有限公司 | Method and system for detecting internal abrasion state of compressor |
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