CN114459123A - Compressor efficiency reduction detection method and device, storage medium and air conditioning unit - Google Patents
Compressor efficiency reduction detection method and device, storage medium and air conditioning unit Download PDFInfo
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- CN114459123A CN114459123A CN202210141666.3A CN202210141666A CN114459123A CN 114459123 A CN114459123 A CN 114459123A CN 202210141666 A CN202210141666 A CN 202210141666A CN 114459123 A CN114459123 A CN 114459123A
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- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 238000004378 air conditioning Methods 0.000 title claims abstract description 11
- 230000009467 reduction Effects 0.000 title abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000013507 mapping Methods 0.000 claims description 27
- 230000015556 catabolic process Effects 0.000 claims description 20
- 238000006731 degradation reaction Methods 0.000 claims description 20
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000000498 cooling water Substances 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
- 230000008569 process Effects 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 1
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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
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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 discloses a compressor efficiency reduction detection method and device, 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 the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return saturation temperature of the compressor according to the current return pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return saturation temperature; and detecting whether the efficiency of the compressor is reduced or not according to the current reference current and the current running current. Therefore, whether the efficiency of the compressor is reduced or not is judged according to the current change condition of the compressor, so that the efficiency reduction after the compressor breaks down is timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
Description
Technical Field
The invention relates to the technical field of compressor fault detection, in particular to a compressor efficiency drop detection method, a computer readable storage medium, an air conditioning unit and a compressor efficiency drop detection device.
Background
The compressor is a core component of the refrigeration system, the whole refrigeration system is shut down once the compressor is damaged, the refrigeration system causes immeasurable loss once the refrigeration system is shut down, the compressor is damaged and is difficult to maintain, the compressor is high in price, and particularly after the compressor has a soft fault, the efficiency value of the compressor is reduced, so that the energy consumption is increased, and the operation reliability of the compressor and the refrigeration system is further influenced. Therefore, it is important to pay attention to the health of the compressor in real time.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective 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 a fault occurs in time, and ensure the reliability and stability of the operation of the compressor.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide an air conditioning unit.
A fourth object of the present invention is to provide a compressor efficiency degradation detection apparatus.
In order to achieve the above object, an embodiment of the first aspect of the present invention provides a method for detecting efficiency degradation of a compressor, including: acquiring the current exhaust pressure and the current return air pressure of a compressor, and acquiring the current running current of the compressor; determining the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return saturation temperature of the compressor according to the current return pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return saturation temperature; and detecting whether the efficiency of the compressor is reduced or not 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 operation current of the compressor is obtained, then the current exhaust saturation temperature of the compressor is determined according to the current exhaust pressure, the current return air saturation 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 saturation temperature and the current return air saturation temperature, and whether the efficiency of the compressor drops or not is detected according to the current reference current and the current operation current. Therefore, whether the efficiency of the compressor is reduced or not is judged according to the current change condition of the compressor, so that the efficiency reduction after the compressor breaks down is timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
In addition, the method for detecting efficiency degradation of a compressor according to the above embodiment of the present invention may further include the following additional technical features:
according to one embodiment of the present invention, determining the present reference current of the compressor according to the present exhaust saturation temperature and the present return saturation temperature includes: acquiring a mapping relation between reference current of the compressor and exhaust saturation temperature and 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 saturation temperature and the mapping relation.
According to one embodiment of the invention, obtaining a mapping relation between a reference current of the compressor and a discharge saturation temperature and a return saturation temperature of the compressor comprises: determining state information of the compressor during normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the working current of the compressor; determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor; and establishing the mapping relation 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.
According to one embodiment of the present invention, determining the present reference current of the compressor according to the present exhaust saturation temperature and the present return saturation temperature includes: determining a compressor current model trained in advance; and inputting the current exhaust saturation temperature and the current return 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 comprises: determining state information of the compressor during normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the working current of the compressor; determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor; and training the 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.
According to an embodiment of the present invention, the detecting whether the compressor efficiency is decreased according to the present reference current and the present operation current includes: determining a current difference between the present operating current and the present reference current; and when the current difference value is larger than a preset current threshold value, determining that the efficiency of the compressor is reduced.
According to one embodiment of the invention, when the current difference is smaller than or equal to a preset current threshold, 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 compressor current model is continued.
To achieve the above object, a computer-readable storage medium according to an embodiment of a second aspect of the present invention is provided, on which a compressor efficiency degradation detection program is stored, and when the compressor efficiency degradation detection program is executed by a processor, the computer-readable storage medium implements the compressor efficiency degradation detection method according to the embodiment of the first aspect.
According to the computer-readable storage medium of the embodiment of the invention, by executing the compressor efficiency reduction detection program, whether the efficiency reduction occurs in the compressor can be judged according to the current change condition of the compressor, so that the efficiency reduction after the fault occurs in the compressor can be timely and accurately judged, and the reliability and the stability of the operation of the compressor can be ensured.
In order to achieve the above object, an air conditioning unit according to an embodiment of a third aspect of the present invention includes a memory, a processor, and a compressor efficiency degradation detection program stored in the memory and operable on the processor, where the processor executes the compressor efficiency degradation detection program to implement the compressor efficiency degradation detection method according to the embodiment of the first aspect.
According to the air conditioning unit disclosed by the embodiment of the invention, through executing the compressor efficiency reduction detection program, whether the efficiency reduction occurs in the compressor can be judged according to the current change condition of the compressor, so that the efficiency reduction after the fault occurs in the compressor 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, a reduction in efficiency detecting apparatus for a compressor 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 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 or not according to the current reference current and the current running current.
According to the efficiency drop detection device of the compressor, the current exhaust pressure and the current return air pressure of the compressor are obtained through the first obtaining module, the current operation current of the compressor is obtained through the second obtaining module, then the current exhaust saturation temperature of the compressor is determined through the determining module according to the current exhaust pressure, the current return air saturation 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 saturation temperature and the current return air saturation temperature, and then whether the efficiency of the compressor drops or not is detected through the detecting module according to the current reference current and the current operation current. Therefore, whether the efficiency of the compressor is reduced or not is judged according to the current change condition of the compressor, so that the efficiency reduction after the compressor breaks down is timely and accurately judged, and the reliability and the stability of the operation 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 schematic flow chart of a compressor efficiency drop detection method according to an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a compressor efficiency drop detection method according to an embodiment of the present invention;
FIG. 3 is a schematic flow diagram of a compressor efficiency drop detection method according to an embodiment of the present invention;
FIG. 4 is a schematic flow diagram of a compressor efficiency drop detection method according to another embodiment of the present invention;
FIG. 5 is a schematic flow diagram of a compressor efficiency drop detection method according to another embodiment of the present invention;
FIG. 6 is a schematic flow diagram of a compressor efficiency drop detection method according to an embodiment of the present invention;
fig. 7 is a block schematic diagram of a compressor efficiency drop detecting apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to 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 schematic flow chart of a compressor efficiency drop detection method according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting the efficiency drop of the compressor includes the following steps:
s101, acquiring the current exhaust pressure and the current return 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 saturation temperature of the compressor according to the current return pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return saturation temperature.
In the embodiment of the present invention, for example, when the current discharge pressure Pdd at the actual operation of the compressor is obtained by a discharge port pressure sensor provided at the discharge port of the compressor, and, after the current return air pressure Pdd of the compressor in actual operation is obtained through a return air port pressure sensor arranged at a return air port of the compressor, according to the current exhaust pressure Psd of the compressor in actual operation, determining the current exhaust saturation temperature Tpdd when the compressor actually operates, and according to the current return air pressure Psd when the compressor actually operates, and then, determining the current reference current Ib of the compressor in actual operation according to the current exhaust saturation temperature Tpdd of the compressor in actual operation and the current air return saturation temperature Tpsd of the compressor in actual operation.
And S103, detecting whether the efficiency of the compressor is reduced or not 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 or not may be detected according to the current reference current Ib during the actual operation of the compressor and according to the current operation current Id during the actual operation of the compressor, so as to determine whether the compressor efficiency is reduced or not according to the current variation condition of the compressor, and accurately determine the efficiency reduction after the compressor is failed, thereby ensuring the reliability and stability of the operation of the compressor.
Further, as shown in fig. 2, in an embodiment of the present invention, determining the present reference current of the compressor according to the present exhaust saturation temperature and the present return saturation temperature includes:
s201, acquiring a mapping relation between 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 the compressor and a discharge saturation temperature and a return saturation temperature of the compressor includes:
s301, determining the state information of the compressor in normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the 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 normally operates, and the compressor discharge pressure Pd when the compressor normally operates, the compressor return pressure Ps when the compressor normally operates, and the compressor operating current I when the compressor normally operates are obtained to be determined.
S302, determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor.
For example, in the embodiment of the present invention, after the compressor discharge pressure Pd in the normal operation and the compressor return pressure Ps in the normal operation are determined, the compressor discharge saturation temperature Tpd in the normal operation may be determined according to the compressor discharge pressure Pd in the normal operation, and the compressor return saturation temperature Tps in the normal operation may be determined according to the compressor return pressure Ps in the normal operation.
And S303, establishing a mapping relation 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.
Specifically, in the embodiment of the present invention, a corresponding mapping relationship may be established according to the compressor discharge saturation temperature Tpd during the normal operation, the compressor return saturation temperature Tps during the normal operation, and the compressor operating current I during the normal operation, for example, the mapping relationship may include that the compressor discharge saturation temperature Tpd during the normal operation and the compressor return saturation temperature Tps during the normal operation of each group of compressors may respectively correspond to the compressor operating current I during the normal operation of one compressor.
Therefore, in the normal operation process of the compressor, the mapping relation between the compressor exhaust saturation temperature Tpd and the compressor return saturation temperature Tps in the normal operation of the compressor and the compressor working current I in the normal operation can be established according to the compressor state information in the normal operation.
And S202, determining the current reference current of the compressor according to the current exhaust saturation temperature, the current return saturation temperature and the mapping relation.
That is to say, in the embodiment of the present invention, the current reference current Ib during the actual operation of the compressor may be determined according to the current exhaust saturation temperature Tpdd during the actual operation and the current return saturation temperature Tpsd during the actual operation, in combination with the mapping relationship between the compressor exhaust saturation temperature Tpd during the normal operation and the compressor return saturation temperature Tps during the normal operation, and the compressor operating current I during the normal operation.
Specifically, in an embodiment of the present invention, a table lookup manner may be used to find the exhaust saturation temperature Tpd during normal operation of the compressor corresponding to the current exhaust saturation temperature Tpdd during actual operation of the compressor from the mapping relationship, and find the exhaust saturation temperature Tpd during normal operation of the compressor corresponding to the current return saturation temperature Tpsd during actual operation of the compressor, and then find the current values corresponding to the exhaust saturation temperature Tpd during normal operation of the compressor and the exhaust saturation temperature Tpd during normal operation of the compressor from the mapping relationship, and then determine the current value as the current reference current Ib during actual operation of the compressor.
Therefore, in the actual operation process of the compressor, the current reference current Ib of the compressor in actual operation can be determined according to the current exhaust saturation temperature Tpdd of the compressor in actual operation and the current return saturation temperature Tpsd of the compressor in actual operation, and by combining the mapping relation established by the exhaust saturation temperature Tpd of the compressor in normal operation, the return saturation temperature Tps of the compressor in normal operation and the working current I of the compressor in normal operation.
Further, as shown in fig. 4, in another embodiment of the present invention, determining the present reference current of the compressor according to the present exhaust saturation temperature and the present return saturation temperature includes:
s401, a compressor current model trained in advance is determined.
Specifically, as shown in fig. 5, determining a pre-trained compressor current model includes:
s501, determining the state information of the compressor in normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the working current of the compressor.
For example, in the embodiment of the present invention, when the compressor normally operates, the state information of the compressor may be determined, and the compressor discharge pressure Pd when the compressor normally operates, the compressor return pressure Ps when the compressor normally operates, and the compressor operating current I when the compressor normally operates may be obtained.
S502, determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor.
For example, in the embodiment of the present invention, after the compressor discharge pressure Pd during the normal operation of the compressor and the compressor return pressure Ps during the normal operation of the compressor are determined, the compressor discharge saturation temperature Tpd during the normal operation of the compressor may be determined according to the compressor discharge pressure Pd during the normal operation, and the compressor return saturation temperature Tps during the normal operation may be determined according to the compressor return pressure Ps during the normal operation.
And 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 according to the compressor discharge saturation temperature Td in the normal operation and the compressor return saturation temperature Ts in the normal operation, and the compressor operation current I in the normal operation.
S402, inputting the current exhaust saturation temperature and the current return 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 when the compressor is actually operated and the current return saturation temperature Tpsd when the compressor is actually operated may be input to the aforementioned compressor current model to obtain the current reference current Ib when the compressor is actually operated according to the compressor current model.
Specifically, in an embodiment of the present invention, the compressor current model may directly calculate the current reference current Ib when the compressor actually operates according to the current exhaust saturation temperature Tpdd when the compressor actually operates and the current return saturation temperature Tpsd when the compressor actually operates.
Therefore, in the actual operation process of the compressor, the current reference current Ib of the actual operation of the compressor can be determined by combining the trained compressor current model according to the current exhaust saturation temperature Tpdd of the actual operation of the compressor and the current return saturation temperature Tpsd of the actual operation of the compressor.
Further, as shown in fig. 6, the detecting whether the efficiency of the compressor is reduced according to the current reference current and the current operation current includes:
and 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 the compressor present reference current Ib is determined, the current difference Δ I between the present operation current Id and the present reference current Ib may be determined according to the compressor present operation current Id at the actual operation and the compressor present reference current Ib at the actual operation.
And S602, determining that the efficiency of the compressor is reduced when the current difference is larger than a preset current threshold.
That is, in the embodiment of the present invention, if the current difference Δ I between the current operation current Id of the compressor at the time of the actual operation of the compressor and the current reference current Ib of the compressor at the time of the actual operation of the compressor is greater than the preset current threshold, it may be determined that the compressor efficiency is decreased.
Alternatively, the preset current threshold may be set 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 Δ I between a current operation current Id when the compressor is actually operated and a current reference current Ib when the compressor is actually operated, and meanwhile, a fault notification message may be sent to prompt a user to maintain and repair the compressor in time.
Therefore, when the current difference value delta I between the current running current Id of the compressor and the current reference current Ib of the compressor during actual running of the compressor is larger than the preset current threshold value, the efficiency reduction of the compressor is judged, the efficiency reduction of the compressor after the fault is timely and accurately judged, and the running reliability and stability of the compressor are ensured.
And further, when the current difference value is smaller than or equal to the preset current threshold value, determining that the compressor normally operates, adding the current exhaust saturation temperature, the current return air saturation temperature and the current operation current into a training sample set, and continuing training the compressor current model.
It is understood that in the embodiment of the present invention, if the current difference Δ I is less than or equal to the preset current threshold, it may be determined that the compressor is normally operated.
In addition, the current exhaust saturation temperature Tpdd of the compressor, the current return air saturation temperature Tpsd of the compressor and the current running current I of the compressor can be further added into the training sample set, so that the compressor current model is continuously trained according to the training sample set, the fitting degree of the compressor current model and the compressor is improved, and the accuracy of efficiency reduction detection of the compressor is further improved.
It should be understood that, since the prior art scheme for detecting the efficiency of the compressor generally only indirectly represents the efficiency value of the compressor through the evaporation pressure, the condensation 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 power 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, all of which are very susceptible to the external environment, resulting in a large error in the timeliness and accuracy of the calculated efficiency value of the compressor, in the method for detecting the efficiency of the compressor according to the embodiment of the present invention, by constructing a relationship or a model about the discharge saturation temperature of the compressor, the return saturation temperature of the compressor, and a current reference value in advance, whether the efficiency of the compressor is reduced or not is directly and effectively detected according to the current reference value and the current running current under the actual working condition of the compressor, and therefore timeliness and accuracy of compressor efficiency value detection are improved.
In summary, according to the method for detecting efficiency degradation of a compressor in the embodiment of the present invention, first, the current discharge pressure of the compressor during actual operation, the current return pressure of the compressor during actual operation, and the current operating current of the compressor during actual operation can be obtained, then, determining the current exhaust saturation temperature of the compressor in actual operation according to the obtained current exhaust pressure of the compressor in actual operation, determining the current air return saturation temperature of the compressor in actual operation according to the acquired current air return pressure of the compressor in actual operation, and determining the current reference current in actual operation according to the current exhaust saturation temperature of the compressor in actual operation and the current return saturation temperature of the compressor, and further, and detecting whether the efficiency of the compressor is reduced or not according to the current reference current of the compressor in actual operation and the current operation current of the compressor in actual operation. Therefore, whether the efficiency of the compressor is reduced or not is judged according to the current change condition of the compressor, so that the efficiency reduction after the compressor breaks down is timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
Based on the foregoing method for detecting efficiency degradation of a compressor according to the embodiment of the present invention, an embodiment of the present invention further provides a computer-readable storage medium, which can implement the specific implementation manner of the method for detecting efficiency degradation of a compressor according to the foregoing embodiment of the present invention, and is not described herein again to reduce redundancy.
In summary, according to the computer-readable storage medium of the embodiment of the present invention, the actuator executes the compressor efficiency reduction detection program stored thereon, and can determine whether the compressor has efficiency reduction according to the current variation condition of the compressor, so as to timely and accurately determine the efficiency reduction after the compressor has a fault, thereby ensuring the reliability and stability of the operation of the compressor.
Based on the compressor efficiency drop detection method according to the embodiment of the present invention, an embodiment of the present invention further provides an air conditioning unit, which can implement a specific implementation manner of the compressor efficiency drop detection method according to the embodiment of the present invention, and details are not repeated herein in order to reduce redundancy.
In summary, according to the air conditioning unit of the embodiment of the invention, the executor executes the compressor efficiency drop detection program stored in the memory, and whether the compressor has efficiency drop can be determined according to the current change condition of the compressor, so that the efficiency drop after the compressor has a fault can be timely and accurately determined, and the reliability and stability of the operation of the compressor can be ensured.
Fig. 7 is a block schematic diagram of a compressor efficiency drop detecting apparatus according to an embodiment of the present invention.
As shown in fig. 7, the compressor efficiency degradation detection apparatus 100 includes: 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 exhaust pressure when the compressor actually operates and a current return air pressure when the compressor actually operates; the second obtaining module 20 may be configured to obtain a current operation current when the compressor is actually operated; the determining module 30 may be configured to determine a current exhaust saturation temperature when the compressor actually operates according to a current exhaust pressure when the compressor actually operates, determine a current return saturation temperature when the compressor actually operates according to a current return air pressure when the compressor actually operates, and determine a current reference current when the compressor actually operates according to the current exhaust saturation temperature and the current return air saturation temperature when the compressor actually operates; the detection module 40 may be configured to detect whether the compressor efficiency is decreased according to a current reference current when the compressor is actually operated and a current operation current when the compressor is actually operated.
Specifically, in an embodiment of the present invention, the first obtaining module 10 may obtain a current discharge pressure of the compressor during actual operation through a discharge port pressure sensor disposed at a discharge port of the compressor, and obtain a current return pressure of the compressor during actual operation through a return port pressure sensor disposed at a return port of the compressor, and the second obtaining module 20 may obtain a current operation current of the compressor during actual operation through a current sensor.
Then, after the first obtaining module 10 obtains the current exhaust pressure of the compressor during actual operation through an exhaust port pressure sensor arranged at an exhaust port of the compressor, and obtains the current return pressure of the compressor during actual operation through a return port pressure sensor arranged at a return port of the compressor, the determining module 30 may determine the current exhaust saturation temperature of the compressor during actual operation according to the current exhaust pressure of the compressor during actual operation, obtain the current return saturation temperature of the compressor during actual operation according to the current return pressure of the compressor during actual operation, and then determine the current reference current of the compressor during actual operation according to the current exhaust saturation temperature of the compressor during actual operation and the current return saturation temperature of the compressor during actual operation.
Furthermore, the detecting module 40 may detect whether the compressor efficiency is reduced according to the current reference current of the compressor during actual operation and the current operating current during actual operation, which are determined by the determining module 30, so as to determine whether the compressor efficiency is reduced according to the current variation of the compressor, and accurately determine that the compressor efficiency is reduced after a fault occurs, thereby ensuring the reliability and stability of the compressor operation.
Further, the determining module 30 is further configured to obtain a mapping relationship between the current reference current of the compressor during actual operation and the exhaust saturation temperature and return saturation temperature of the compressor during actual operation, and determine the current reference current of the compressor during actual operation according to the current exhaust saturation temperature and return saturation temperature of the compressor during actual operation and the mapping relationship.
That is, in the embodiment of the present invention, the determining module 30 may determine the current reference current of the compressor during actual operation according to the current exhaust saturation temperature during actual operation and the current return saturation temperature during actual operation, in combination with the aforementioned mapping relationship between the compressor exhaust saturation temperature during normal operation and the compressor return saturation temperature during normal operation, and the compressor operating current during normal operation.
Specifically, in an embodiment of the present invention, the determining module 30 may first find the exhaust saturation temperature during normal operation of the compressor corresponding to the current exhaust saturation temperature during actual operation of the compressor and the exhaust saturation temperature during normal operation of the compressor corresponding to the current return saturation temperature during actual operation of the compressor from the mapping relationship by looking up a table, then find the current values corresponding to the exhaust saturation temperature during normal operation of the compressor and the exhaust saturation temperature during normal operation of the compressor from the mapping relationship, and then determine the current value as the current reference current during actual operation of the compressor.
Further, the determining module 30 is further configured to determine the state information of the compressor during normal operation, where the state information includes the compressor discharge pressure during normal operation, the compressor return air pressure during normal operation, and the compressor operating current during normal operation, and determine the compressor discharge air saturation temperature during normal operation according to the compressor discharge pressure during normal operation, and determine the 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 air saturation temperature during normal operation, the compressor return air saturation temperature during normal operation, and the compressor operating current during normal operation.
Specifically, in the embodiment of the present invention, a corresponding mapping relationship may be established according to the compressor discharge saturation temperature during normal operation, the compressor return saturation temperature during normal operation, and the compressor operating current during normal operation, for example, the mapping relationship may include that the compressor discharge saturation temperature during normal operation and the compressor return saturation temperature during normal operation of each group of compressors may respectively correspond to the compressor operating current during normal operation of one compressor.
Further, the determining module 30 is further configured to determine a compressor current model trained in advance, and then input the current exhaust saturation temperature of the compressor during normal operation and the current return saturation temperature of the compressor during normal operation into the compressor current model to obtain the current reference current of the compressor during actual operation of the compressor.
Specifically, in another embodiment of the present invention, the determining module 30 may calculate and obtain the current reference current of the compressor in actual operation directly according to the current exhaust saturation temperature of the compressor in actual operation and the current return saturation temperature of the compressor in actual operation through a pre-trained compressor current model.
Further, the determining module 30 is further configured to determine the state information of the compressor during normal operation, where the state information includes the compressor discharge pressure, the compressor return air pressure, and the compressor operating current during normal operation, determine the compressor discharge saturation temperature during normal operation according to the compressor discharge pressure during normal operation, determine the compressor return air saturation temperature during normal operation according to the compressor return air pressure during normal operation, and train the compressor current model according to 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 according to the compressor discharge saturation temperature in normal operation, the compressor return saturation temperature in normal operation, and the compressor operating current in normal operation.
Further, the detecting module 40 is further configured to determine a current difference between a current operating current of the compressor during actual operation and a current reference current of the compressor during actual operation, and determine that the efficiency of the compressor is decreased when the current difference between the current operating current of the compressor during actual operation and the current reference current of the compressor during actual operation is greater than a preset current threshold.
Alternatively, the preset current threshold may be set 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 operating currents when the compressor is actually operated, and meanwhile, a fault notification message may be sent to prompt a user to maintain and repair the compressor in time.
Further, the detection module 40 is further configured to, when a current difference between a current operation current in actual operation and a current reference current in actual operation of the compressor is less than or equal to a preset current threshold, determine that the compressor normally operates, add a current exhaust saturation temperature of the compressor in actual operation, a current return saturation temperature of the compressor in actual operation, and a current operation current of the compressor in actual operation to the training sample set, and continue training the compressor current model.
It is understood that, in an embodiment of the present invention, the detection module 40 may determine that the compressor is normally operated if the current difference is less than or equal to the preset current threshold.
In addition, the current exhaust saturation temperature of the compressor, the current return air saturation temperature of the compressor and the current running current of the compressor can be further added into the training sample set, so that the compressor current model is continuously trained according to the training sample set, the fitting degree of the compressor current model and the compressor is improved, and the accuracy of compressor efficiency reduction detection is further improved.
It should be understood that, since the prior art scheme for detecting the efficiency of the compressor only indirectly represents the efficiency value of the compressor through the evaporation pressure, the condensation 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 operation frequency of the compressor, the power 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, all of which are very susceptible to the external environment, resulting in a large error in the timeliness and accuracy of the calculated efficiency value of the compressor, in the compressor efficiency detecting apparatus according to the embodiment of the present invention, the relation or model between the discharge saturation temperature of the compressor, the return air saturation temperature of the compressor, and the current reference value is previously constructed through the determining module 30, whether the efficiency of the compressor is reduced or not is directly and effectively detected according to the current reference value and the current running current under the actual working condition of the compressor through the detection module 40, and therefore the timeliness and the accuracy of the detection of the efficiency value of the compressor are improved.
In summary, according to the efficiency drop detection device of the compressor in the embodiment of the present invention, the first obtaining module obtains the current discharge pressure of the compressor during actual operation and the current return pressure of the compressor during actual operation, and the second obtaining module obtains the current running current of the compressor during actual operation, then, the current exhaust saturation temperature of the compressor in actual operation is determined by a determination module according to the current exhaust pressure of the compressor in actual operation, and the current air return saturation temperature of the compressor during actual work is determined according to the current air return pressure of the compressor during actual work, and determining the current reference current of the compressor during actual operation according to the current exhaust saturation temperature of the compressor during actual operation and the current return saturation temperature of the compressor during actual operation, and then, detecting whether the efficiency of the compressor is reduced or not through a detection module according to the current reference current of the compressor and the current running current of the compressor during actual work. Therefore, whether the efficiency of the compressor is reduced or not is judged according to the current change condition of the compressor, so that the efficiency reduction of the compressor after a fault is timely and accurately judged, and the reliability and the stability of the operation of the compressor are ensured.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can 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). Further, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can 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 should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, 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, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
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 the current exhaust saturation temperature of the compressor according to the current exhaust pressure, determining the current return saturation temperature of the compressor according to the current return pressure, and determining the current reference current of the compressor according to the current exhaust saturation temperature and the current return saturation temperature;
and detecting whether the efficiency of the compressor is reduced or not according to the current reference current and the current running current.
2. The method of claim 1, wherein determining a present reference current for the compressor based on the present exhaust saturation temperature and the present return saturation temperature comprises:
acquiring a mapping relation between reference current of the compressor and exhaust saturation temperature and 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 saturation temperature and the mapping relation.
3. The method of claim 2, wherein obtaining a mapping between a reference current of the compressor and a discharge saturation temperature and a return saturation temperature of the compressor comprises:
determining state information of the compressor during normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the working current of the compressor;
determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor;
and establishing the mapping relation 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.
4. The method of claim 1, wherein determining a present reference current for the compressor based on the present exhaust saturation temperature and the present return saturation temperature comprises:
determining a compressor current model trained in advance;
and inputting the current exhaust saturation temperature and the current return 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 during normal operation, wherein the state information comprises the exhaust pressure, the return pressure and the working current of the compressor;
determining the exhaust saturation temperature of the compressor during normal operation according to the exhaust pressure of the compressor, and determining the return saturation temperature of the compressor during normal operation according to the return pressure of the compressor;
and training the 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.
6. The method according to any one of claims 1-5, wherein detecting whether the compressor efficiency is decreased according to the present reference current and the present operation current comprises:
determining a current difference between the present operating current and the present reference current;
and when the current difference value is larger than a preset current threshold value, determining that the efficiency of the compressor is reduced.
7. The method of claim 6, 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 exhaust saturation temperature and the current return saturation temperature, and the current operating current to a training sample set to continue training a compressor current model.
8. 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 7.
9. An air conditioning unit, characterized by comprising a memory, a processor and a compressor efficiency drop detection program stored on the memory and operable on the processor, wherein the processor implements the compressor efficiency drop detection method according to any one of claims 1 to 7 when executing the compressor efficiency drop detection program.
10. 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 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 or not according to the current reference current and the current running current.
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