CN113028587B - Fault handling method and system for compressor - Google Patents
Fault handling method and system for compressor Download PDFInfo
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- CN113028587B CN113028587B CN202110351546.1A CN202110351546A CN113028587B CN 113028587 B CN113028587 B CN 113028587B CN 202110351546 A CN202110351546 A CN 202110351546A CN 113028587 B CN113028587 B CN 113028587B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a fault processing method and a system of a compressor, wherein the method comprises the following steps: acquiring a pressure abnormal protection state of the compressor determined by an abnormal pressure value; under the abnormal pressure protection state, collecting the temperature of a compressor winding of a compressor in a preset statistical period; determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding; if the compressor has a pressure abnormity fault, controlling the compressor to execute a pressure abnormity instruction; and if the compressor has no pressure abnormal fault, controlling the compressor to be in a normal running state. The scheme can improve the accuracy of processing the pressure abnormity faults of the compressor.
Description
Technical Field
The invention relates to the technical field of compression control, in particular to a fault processing method and system of a compressor.
Background
A compressor refrigeration system is generally composed of a compressor, a condenser, a throttling device, an evaporator, a temperature sensor, a high-pressure protector, and a low-pressure protector. The high-pressure protector and the low-pressure protector determine the reliability of the compressor refrigerating system through system pressure protection devices.
For example, patent application No. CN201910667356.3 discloses a pressure control method and a control device for an air conditioner, and an air conditioner. The invention continuously detects the running pressure of the unit, and correspondingly adjusts the rotating speed of the outer fan or the inner fan according to the comparison between the exhaust pressure and the return pressure and the preset value, so that the running pressure of the unit is in a proper range value.
However, if the high-pressure protector and the low-pressure protector are misjudged, the compressor system cannot be effectively protected. For example, in practice, when the evaporator and the condenser are dirty and seriously lack fluorine, or the fan is damaged, high-pressure or low-pressure faults can occur, so that the fault treatment is easy to occur.
Therefore, it is desirable to provide a fault handling method and system for a compressor to improve the accuracy of fault handling.
Disclosure of Invention
The embodiment of the invention provides a fault processing method and system for a compressor, which can improve the accuracy of processing the pressure abnormal fault of the compressor.
In a first aspect, an embodiment of the present invention provides a fault handling method for a compressor, including:
acquiring a pressure abnormal protection state of the compressor determined by an abnormal pressure value;
under the pressure abnormal protection state, collecting the temperature of a compressor winding of the compressor in a preset statistical period;
determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding;
if the compressor has a pressure abnormity fault, controlling the compressor to execute a pressure abnormity instruction;
and if the compressor has no pressure abnormal fault, controlling the compressor to be in a normal running state.
In a possible implementation manner, when the pressure abnormal protection state is a high-pressure abnormal protection state, the preset statistical period is a first preset statistical period;
the determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding comprises:
judging whether the temperature of the compressor winding in the first preset statistical period is between the first preset winding temperature and the second preset winding temperature; the second preset winding temperature is greater than the first preset winding temperature;
if yes, determining that the compressor has no high-pressure abnormal fault;
and if not, determining that the compressor has a high-pressure abnormal fault.
In one possible implementation, the controlling the compressor to execute a pressure anomaly command includes:
when it is determined that the compressor has a high-voltage abnormal fault and the temperature of the compressor winding in the first preset statistical period is lower than the temperature of the first preset winding, controlling the compressor to increase the frequency of the compressor according to preset control logic;
when it is determined that the compressor has a high-voltage abnormal fault and the temperature of a compressor winding in the first preset statistical period is greater than the temperature of a second preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
the controlling the compressor in a normal operation state includes:
controlling the compressor to operate at a current compressor frequency when it is determined that there is no high-pressure abnormal fault in the compressor.
In a possible implementation manner, when the pressure abnormal protection state is a low-pressure abnormal protection state, the preset statistical period is a second preset statistical period;
the determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding comprises:
judging whether the temperature of the compressor winding in the second preset statistical period is between the temperature of a third preset winding and the temperature of a fourth preset winding or not; the fourth preset winding temperature is greater than the third preset winding temperature;
if yes, determining that the compressor has no low-pressure abnormal fault;
if not, determining that the compressor has a low-pressure abnormal fault.
In one possible implementation, the controlling the compressor to execute the pressure abnormality instruction includes:
when the compressor is determined to have a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is smaller than the third preset winding temperature, controlling the compressor to increase the frequency of the compressor according to preset control logic;
when it is determined that the compressor has a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is greater than the fourth preset winding temperature, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
the controlling the compressor in a normal operation state includes:
controlling the compressor to operate at a current compressor frequency when it is determined that there is no low pressure abnormal fault with the compressor.
In one possible implementation, the compressor frequency is calculated by the following set of equations:
F＝λ·Q c ·KT i ·KT o ·KT △
wherein F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, Q c For characterizing a preset refrigerating capacity, KT, of the compressor i For characterizing the temperature correction coefficient, KT, in the room in which the compressor is located o For characterizing the outdoor temperature correction coefficient, KT △ A correction factor for characterizing a difference between the indoor temperature and the target temperature.
In a second aspect, an embodiment of the present invention further provides a fault handling system for a compressor, including: the device comprises a pressure detection module, a fault processing module and a compressor;
the pressure detection module and the fault processing module are both connected with the compressor;
the pressure detection module is used for acquiring a pressure value of the compressor and determining a pressure abnormal protection state according to the pressure value;
the fault handling module is applied to the method of any one of the first aspect.
In one possible implementation manner, the fault processing module includes a fault obtaining module and an operation module;
the fault acquisition module comprises a low-pressure module, a high-pressure module and a motor winding temperature control module;
the operation module comprises a timer module, an identification module, a confirmation module and an operation module;
the low-pressure module is used for detecting low-pressure pd and primarily judging low-pressure faults and outputting a low-pressure abnormal signal to prevent a compressor from being damaged due to the fact that no refrigerant runs in a system;
the high-pressure module carries out high-pressure pg detection and high-pressure fault preliminary judgment, and outputs a high-pressure abnormal signal when detecting that the high-pressure is higher than a certain value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor of the compressor in real time, comparing the temperature value ti with a certain threshold value field [ tmin, tmax ], and giving control logic for controlling the compressor and outputting a winding temperature value ti if the temperature value ti is between the [ tmin, tmax ];
and the operation module controls the operation of the compressor together according to the three parameters ti, pd and pg.
In one possible implementation form of the method,
the motor winding temperature control module is used for acquiring a winding temperature value ti of the motor in real time, comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than tmin, operating the refrigerating system according to normal control logic; tmin is more than or equal to ti and less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, the compressor frequency decreases.
In one possible implementation manner, the operation module includes a timer module, an identification module, a confirmation module and an operation module;
the timer module consists of 2 counters J1 and J2 and is used for respectively counting the time length of the occurrence of low-pressure faults and high-pressure faults;
the identification module is used for confirming the fault category after the compressor has a high-pressure fault or a low-pressure fault;
the confirming module is used for confirming whether the real-time winding temperature ti of the compressor is between tmin and tmax;
and the operation module is used for controlling the compressor to stop or operate according to a preset control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T.
According to the technical scheme, when the scheme provided by the invention is used for fault treatment of the compressor, when the pressure abnormal protection state of the compressor is detected, the winding temperature of the compressor in a period of time is collected in the state, and then whether the pressure abnormal fault really occurs to the compressor is further determined according to the winding temperature, if the pressure abnormal fault really occurs, the compressor can be controlled to execute the pressure abnormal instruction, otherwise, the compressor can normally run. Therefore, according to the scheme, after the information of pressure abnormity is obtained through detection, the judgment of faults is further carried out by collecting the temperature of the compressor winding, the pressure abnormity of the compressor caused by faults of some non-compressors is avoided, the accuracy of fault judgment of the compressor is greatly improved, and the accuracy of fault treatment of the compressor is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a fault handling method of a compressor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a fault handling apparatus of a compressor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fault handling system of a compressor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fault handling system of a compressor according to another embodiment of the present invention;
fig. 5 is a schematic view of a refrigeration system of a compressor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
In the prior art, when a compressor is protected, a high-voltage protector and a low-voltage protector are generally adopted for fault judgment, and then fault processing is performed according to a judgment result. However, in practice, some non-compressor faults also cause abnormal conditions of the compressor pressure, such as dirty evaporator and condenser, severe fluorine shortage, fan damage and the like. Therefore, the failure determination of the compressor only by the pressure abnormality is liable to cause the failure erroneous determination, resulting in the erroneous processing.
Therefore, in order to solve the above technical problem, it is considered that when a pressure abnormal state occurs, whether the compressor fails or not is further verified and judged by detecting the winding temperature of the compressor, so that the accuracy of processing the compressor failure is improved.
As shown in fig. 1, the method for processing a fault of a compressor provided by the present invention may specifically include the following steps:
step 101: acquiring a pressure abnormal protection state of the compressor determined by an abnormal pressure value;
step 102: under the abnormal pressure protection state, collecting the temperature of a compressor winding of a compressor in a preset statistical period;
step 103: determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding;
step 104: if the compressor has a pressure abnormity fault, controlling the compressor to execute a pressure abnormity instruction;
step 105: and if the compressor has no pressure abnormal fault, controlling the compressor to be in a normal running state.
When the compressor fails, parameters such as power and frequency of a motor of the compressor can be changed, and further, the temperature of a winding of the compressor can be abnormally changed. Based on the above, if the pressure sensor detects that the pressure is abnormal and the winding temperature is beyond the set safe temperature range, the compressor is indicated to be in the fault of the pressure abnormality; on the contrary, if the pressure sensor detects that the pressure abnormal state is detected, but the winding temperature does not change beyond the set safe temperature range, the reason for the pressure abnormal state is not caused by the compressor, and may be caused by the faults of the condenser, the evaporator, the fan and the like.
In the embodiment of the invention, when the scheme provided by the invention is used for fault treatment of the compressor, when the pressure abnormal protection state of the compressor is detected, the winding temperature of the compressor in a period of time is collected in the state, and then whether the pressure abnormal fault really occurs to the compressor is further determined according to the winding temperature, if the pressure abnormal fault really occurs, the compressor can be controlled to execute the pressure abnormal instruction, otherwise, the compressor can normally run. Therefore, according to the scheme, after the information of pressure abnormity is obtained through detection, the judgment of faults is further carried out by collecting the temperature of the compressor winding, the pressure abnormity of the compressor caused by faults of some non-compressors is avoided, the accuracy of fault judgment of the compressor is greatly improved, and the accuracy of fault treatment of the compressor is further improved.
In step 101 of the embodiment of the present invention, when the pressure abnormal protection state of the compressor is obtained, it may be considered that a pressure sensor is installed on the compressor, and then the pressure sensor detects the pressure value of the compressor in real time, so as to determine whether the compressor is in the pressure abnormal protection state. For example, when the set pressure value is less than 0.05MPa, the protection state is a low pressure abnormal protection state, and when the set pressure value is greater than 4.5MPa, the protection state is a high pressure abnormal protection state.
In the embodiment of the invention, a high-voltage and low-voltage protection mechanism can be further arranged. For example, for a high-pressure protection mechanism, the set return difference time is 3s, when the pressure value acquired each time is compared with the set pressure threshold interval, the time of the currently acquired pressure value is returned by 3s, and the pressure value acquired at the time after the pressure value is returned by 3s is taken as the pressure value at the current time, that is, the pressure value compared with the pressure threshold interval each time is the pressure value corresponding to the time of the previous 3s, so that the pressure value is compared with the pressure threshold interval, and thus, the pressure protection is realized.
When the pressure sensor is used for pressure detection, it is also conceivable to install a plurality of pressure sensors on the compressor, and to perform processing methods such as decision making or averaging on values detected by the plurality of pressure sensors, thereby further improving the judgment of the pressure abnormal protection state.
In step 102 of the embodiment of the present invention, when the temperature of the compressor winding is collected in the abnormal pressure state, it may be considered to install a temperature sensor on the motor of the compressor. When the pressure of the compressor is abnormal, the temperature of the compressor winding in the statistical period is detected through the temperature sensor by presetting the statistical period of the temperature of the compressor winding. Of course, based on the above consideration of installing a plurality of pressure sensors, it is also contemplated to install a plurality of temperature sensors to obtain a more accurate compressor winding temperature.
In the method for processing a fault of a compressor shown in fig. 1, when the pressure abnormal protection state in step 101 is the high-pressure abnormal protection state, the preset statistical period in step 102 is a first preset statistical period. Then, the step 103 of determining whether the compressor has the pressure abnormal fault according to the winding temperature of the compressor specifically includes the following steps:
judging whether the temperature of the compressor winding in the first preset statistical period is between the first preset winding temperature and the second preset winding temperature or not; the temperature of the second preset winding is higher than that of the first preset winding;
if yes, determining that the compressor has no high-pressure abnormal fault;
if not, determining that the compressor has a high-pressure abnormal fault.
In the embodiment of the invention, when the high-voltage abnormal protection state of the compressor is detected by a pressure sensor and other devices, a timer can be used for timing, meanwhile, the temperature of the winding of the compressor in a first preset statistical period is collected, and after winding, whether the temperature of the winding is between the first preset winding temperature and the second preset winding temperature is judged. If the compressor is located in the middle, the high-pressure abnormal fault does not exist in the compressor, and the high-pressure abnormal fault is caused not by the compressor but by devices such as a condenser, an evaporator, a fan and the like outside the compressor; if the temperature of the high-voltage abnormal fault is out of the first preset winding temperature and the second preset winding temperature, the high-voltage abnormal fault is caused by the compressor.
For example, for a high-voltage abnormal protection state, a first preset statistical period is preset to be 5s, the first preset winding temperature is 35 ℃, and the second preset winding temperature is 85 ℃. Then, when a high-voltage abnormal protection state occurs, the temperature sensor detects the winding temperature within 5s, and if the detected temperature is between 35 and 85 ℃, the high-voltage abnormal fault does not exist; if the detected winding temperature is less than 35 ℃ or more than 85 ℃, the high-pressure abnormal fault of the compressor is indicated, and a pressure abnormal instruction needs to be executed for processing.
As shown in fig. 1, in the method for processing a fault of a compressor, when the pressure abnormal protection state in step 101 is the high-pressure abnormal protection state, the step 104 of controlling the compressor to execute the pressure abnormal instruction may specifically include:
when it is determined that the compressor has a high-voltage abnormal fault and the temperature of a compressor winding in a first preset statistical period is smaller than the temperature of a first preset winding, controlling the compressor to increase the frequency of the compressor according to a preset control logic;
when the compressor is determined to have a high-voltage abnormal fault and the winding temperature of the compressor in the first preset statistical period is greater than the temperature of the second preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
controlling the compressor to be in a normal operation state may specifically include:
and controlling the compressor to operate at the current compressor frequency when it is determined that the compressor does not have the high-pressure abnormal fault.
In the embodiment of the invention, the compressor can be protected and the damage of the compressor can be avoided by determining whether the compressor is in a high-pressure abnormal fault, judging the relationship between the winding temperature of the compressor and the preset winding temperature and adopting different control modes for the compressor according to different judgment results.
For example, when the compressor is in a high-voltage abnormal fault, the relationship between the temperature of the winding of the compressor and the first preset temperature in the first preset statistical period is judged, if the temperature of the winding of the compressor in the first preset statistical period is less than the temperature of the first preset winding, the conditions that the compressor runs at low power or low frequency and the like are indicated, and the compressor is controlled to increase the running frequency of the compressor according to the preset control logic, so that the normal work of the compressor is ensured, and the working efficiency of the compressor is increased.
For another example, when the compressor is in a high-voltage abnormal fault, the relationship between the temperature of the compressor winding in the first preset statistical period and the second preset temperature is determined, and if the temperature of the compressor winding in the first preset statistical period is greater than the temperature of the second preset winding, the situation that the operating power and the operating frequency of the compressor are too high is indicated, or the compressor has a problem, so that the risk of damage to the compressor exists. The frequency of the compressor is controlled to be reduced or the compressor is controlled to be shut down, so that the compressor is protected.
For example, when the compressor has no high-pressure abnormal fault, it indicates that the compressor is operating normally, and therefore, the compressor only needs to be controlled to operate at the current compressor frequency, so that the compressor can be ensured to be in a safe operation state, and the working efficiency of the compressor can be ensured.
For example, the preset first preset winding temperature is 35 ℃, the second preset winding temperature is 85 ℃, and when the compressor is in a high-voltage abnormal fault, if the collected compressor winding temperature is 28 ℃, the compressor can be controlled to increase the operating frequency of the compressor according to the preset control logic; if the collected temperature of the compressor winding is 100 ℃, controlling the frequency of the compressor to be reduced or controlling the compressor to be shut down; if the collected temperature of the compressor winding is 50 ℃, the compressor is not in high-pressure abnormal fault, and therefore the compressor is controlled to operate at the current compressor frequency.
In the method for processing a fault of a compressor shown in fig. 1, when the pressure abnormal protection state in step 101 is the low-pressure abnormal protection state, the preset statistical period in step 102 is a second preset statistical period. Then, the step 103 of determining whether there is a pressure abnormal fault in the compressor according to the winding temperature of the compressor specifically includes the following steps:
judging whether the temperature of the compressor winding in the second preset statistical period is between the temperature of the third preset winding and the temperature of the fourth preset winding or not; the fourth preset winding temperature is higher than the third preset winding temperature;
if yes, determining that the compressor has no low-pressure abnormal fault;
if not, determining that the compressor has a low-pressure abnormal fault.
As shown in fig. 1, in the method for processing a fault of a compressor, when the pressure abnormal protection state in step 101 is the low-pressure abnormal protection state, the step 104 of controlling the compressor to execute the pressure abnormal command may specifically include:
when the compressor is determined to have a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is smaller than the third preset winding temperature, controlling the compressor to increase the frequency of the compressor according to preset control logic;
when the compressor is determined to have a low-pressure abnormal fault and the winding temperature of the compressor in the second preset statistical period is greater than the fourth preset winding temperature, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
controlling the compressor to be in a normal operation state, including:
when it is determined that the compressor does not have the low pressure abnormal fault, the compressor is controlled to operate at the current compressor frequency.
It is easy to understand that the pressure abnormal protection state is the low pressure abnormal protection state and the above-mentioned pressure abnormal state is the high pressure abnormal protection state are based on the same inventive concept, and the detailed description of the low pressure abnormal protection state is not repeated here, and the specific content can be referred to the case of the high pressure abnormal protection state.
When the compressor fault is processed, the frequency of the compressor needs to be controlled to change to a certain extent, so that the purpose of controlling the compressor to process the fault is achieved. Specifically, in the logic for setting the compressor frequency, the compressor frequency may be calculated specifically by the following formula, thereby controlling the compressor frequency according to the formula. The specific formula is as follows:
F＝λ·Q c ·KT i ·KT o ·KT △
where F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, Q c A predetermine refrigerating capacity, KT for characterising compressor i For characterizing the temperature correction coefficient, KT, in the room in which the compressor is located o For characterizing the outdoor temperature correction coefficient, KT △ A correction factor for characterizing a difference between the indoor temperature and the target temperature.
In the embodiment of the invention, the running frequency of the compressor can be accurately obtained by setting the preset refrigerating capacity and the target temperature of the compressor, so that the running frequency of the compressor can be accurately controlled. In addition, the calculation formula of the compressor frequency provided by the embodiment considers the indoor and outdoor temperatures, so that the influence of the external environment can be fully considered, and the precision of the compressor frequency control is improved.
As shown in fig. 2, an embodiment of the present invention further provides a fault handling module of a compressor, configured to execute the fault handling method of a compressor provided in any embodiment of the foregoing embodiments, where the fault handling module of a compressor includes: the device comprises an acquisition unit 201, a collection unit 202, a determination unit 203 and an execution unit 204;
an acquiring unit 201 for acquiring a pressure abnormal protection state of the compressor determined by the abnormal pressure value;
the acquisition unit 202 is configured to acquire the temperature of the compressor winding in a preset statistical period of the compressor in the pressure abnormal protection state determined by the acquisition unit 201;
the determining unit 203 is used for determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding acquired by the acquiring unit 202;
an execution unit 204 for controlling the compressor to execute the pressure abnormality instruction if the determination unit 203 determines that the compressor has the pressure abnormality fault; or if the determination unit 203 determines that there is no pressure abnormality fault in the compressor, the compressor is controlled to be in a normal operation state.
In one possible implementation manner, when the pressure abnormal protection state is the high-pressure abnormal protection state, the preset statistical period is a first preset statistical period; the determination unit 203 is configured to perform the following operations:
judging whether the temperature of the compressor winding in the first preset statistical period is between the first preset winding temperature and the second preset winding temperature; the temperature of the second preset winding is higher than that of the first preset winding;
if yes, determining that the compressor has no high-pressure abnormal fault;
if not, determining that the compressor has a high-pressure abnormal fault.
In one possible implementation, the execution unit 204 is configured to perform the following operations:
when the compressor is determined to have a high-voltage abnormal fault and the winding temperature of the compressor in a first preset statistical period is smaller than the first preset winding temperature, controlling the compressor to increase the frequency of the compressor according to a preset control logic;
when the compressor is determined to have a high-voltage abnormal fault and the winding temperature of the compressor in the first preset statistical period is greater than the temperature of the second preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
and controlling the compressor to operate at the current compressor frequency when it is determined that the compressor does not have the high-pressure abnormal fault.
In a possible implementation manner, when the pressure abnormal protection state is the low-pressure abnormal protection state, the preset statistical period is a second preset statistical period; the determination unit 203 is configured to perform the following operations:
judging whether the temperature of the compressor winding in the second preset statistical period is between the temperature of the third preset winding and the temperature of the fourth preset winding or not; the fourth preset winding temperature is higher than the third preset winding temperature;
if yes, determining that the compressor has no low-pressure abnormal fault;
if not, determining that the compressor has a low-pressure abnormal fault.
In one possible implementation, the execution unit 204 is configured to perform the following operations:
when the compressor is determined to have a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is smaller than the third preset winding temperature, controlling the compressor to increase the frequency of the compressor according to preset control logic;
when the compressor is determined to have a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is greater than the winding temperature of the fourth preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
and controlling the compressor to operate at the current compressor frequency when it is determined that the low pressure abnormal fault does not exist in the compressor.
In a possible implementation manner, when the execution unit 204 controls the compressor to perform frequency adjustment, the compressor frequency may be implemented as follows:
F＝λ·Q c ·KT i ·KT o ·KT △
where F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, Q c A predetermine refrigerating capacity, KT for characterising compressor i For characterizing compressorsTemperature correction coefficient in the room, KT o For characterizing the outdoor temperature correction coefficient, KT △ A correction factor for characterizing a difference between the indoor temperature and the target temperature.
As shown in fig. 3, an embodiment of the present invention further provides a fault handling system for a compressor, including: a pressure detection module 301, a fault processing module 302 and a compressor 303 provided by any one of the above device embodiments;
the pressure detection module 301 and the fault processing module 302 are both connected with the compressor 303;
the pressure detection module 301 is configured to obtain a pressure value of the compressor 303 and determine a pressure abnormal protection state according to the pressure value;
the fault processing module 302 is applied to the fault processing method of the compressor provided in any of the above embodiments, and processes the fault of the compressor together with the pressure detection module 301.
In a possible implementation manner, as shown in fig. 4, the fault processing module includes a fault obtaining module and an operation module;
the fault acquisition module comprises a low-pressure module, a high-pressure module and a motor winding temperature control module;
the operation module comprises a timer module, an identification module, a confirmation module and an operation module;
the low-pressure module performs low-pressure pd detection and low-pressure fault preliminary judgment and outputs a low-pressure abnormal signal to prevent the compressor from being damaged due to the fact that no refrigerant runs in the system;
the high-pressure module carries out high-pressure pg detection and high-pressure fault preliminary judgment, and outputs a high-pressure abnormal signal when detecting that the high-pressure is higher than a certain value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor of the compressor in real time and comparing the temperature value ti with a certain threshold value field [ tmin, tmax ], and if the temperature value ti is between the threshold value field [ tmin, tmax ], a control logic for controlling the compressor is given out and the winding temperature value ti is output;
and the operation module controls the operation of the compressor together according to the three parameters ti, pd and pg.
In a possible implementation manner, the motor winding temperature control module is used for acquiring a winding temperature value ti of a motor in real time and comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than tmin, the refrigerating system operates according to a normal control logic; tmin is more than or equal to ti and less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, the compressor frequency decreases.
In one possible implementation, the operation module includes a timer module, an identification module, a confirmation module and an operation module;
the timer module consists of 2 counters J1 and J2 and is used for respectively counting the time length of the fault of the low pressure and the high pressure;
the identification module is used for confirming the fault category after the high-pressure fault or the low-pressure fault occurs in the compressor;
the confirming module is used for confirming whether the real-time winding temperature ti of the compressor is between tmin and tmax;
and the operation module is used for controlling the compressor to stop or operate according to a preset control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T.
In one possible implementation, the fault handling module 302 is used in a refrigerator, an air conditioner, or a freezer and has a display module, and the fault handling module 302 communicates with the display module; the operation module can report faults to the compressor control module and the fault display module in real time according to operation results, wherein the faults are high-voltage switch faults or low-voltage switch faults and are communicated with the compressor driving module for control.
It is to be understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the failure handling system of the compressor. In other embodiments of the invention, the fault handling system of the compressor may include more or fewer components than shown, or combine certain components, or split certain components, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
For the information interaction, execution process and other contents between the modules in the system, the specific contents can refer to the description in the embodiment of the method of the present invention because the same conception is based on, and are not described herein again.
An embodiment of the present invention further provides a fault handling apparatus for a compressor, including: at least one memory and at least one processor;
at least one memory for storing a machine readable program;
at least one processor for invoking a machine readable program to perform a fault handling method of a compressor in any embodiment of the present invention.
Embodiments of the present invention also provide a computer-readable medium storing instructions for causing a computer to perform a fault handling method of a compressor as described herein. Specifically, a method or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the above-described embodiments is stored may be provided, and a computer (or a CPU or MPU) of the method or the apparatus is caused to read out and execute the program code stored in the storage medium.
In this case, the program code itself read from the storage medium can realize the functions of any of the above-described embodiments, and thus the program code and the storage medium storing the program code constitute a part of the present invention.
Examples of the storage medium for supplying the program code include a floppy disk, a hard disk, a magneto-optical disk, an optical disk (e.g., CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW), a magnetic tape, a nonvolatile memory card, and a ROM. Alternatively, the program code may be downloaded from a server computer via a communications network.
In addition, the refrigeration system of the compressor can refer to the schematic diagram shown in fig. 5, and the details are not repeated herein.
Further, it should be clear that the functions of any one of the above-described embodiments can be implemented not only by executing the program code read out by the computer, but also by performing a part or all of the actual operations by an operation method or the like operating on the computer based on instructions of the program code.
The foregoing description of specific embodiments of the present invention has been presented. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The above embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for handling a failure in a compressor, comprising:
acquiring a pressure abnormal protection state of the compressor determined by an abnormal pressure value;
under the pressure abnormal protection state, collecting the temperature of a compressor winding of the compressor in a preset statistical period;
determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding;
if the compressor has a pressure abnormity fault, controlling the compressor to execute a pressure abnormity instruction;
if the compressor has no pressure abnormal fault, controlling the compressor to be in a normal running state;
when the pressure abnormal protection state of the compressor is obtained, detecting the pressure value of the compressor in real time through a pressure sensor arranged on the compressor to determine whether the compressor is in the pressure abnormal protection state;
when the pressure abnormal protection state is a high-pressure abnormal protection state, the preset statistical period is a first preset statistical period;
the determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding comprises:
judging whether the temperature of the compressor winding in the first preset statistical period is between the first preset winding temperature and the second preset winding temperature; the second preset winding temperature is greater than the first preset winding temperature;
if yes, determining that the compressor does not have a high-pressure abnormal fault;
if not, determining that the compressor has a high-pressure abnormal fault;
the controlling the compressor to execute the pressure abnormality instruction includes:
when it is determined that the compressor has a high-voltage abnormal fault and the temperature of the compressor winding in the first preset statistical period is lower than the temperature of the first preset winding, controlling the compressor to increase the frequency of the compressor according to a preset control logic;
when it is determined that the compressor has a high-voltage abnormal fault and the temperature of a compressor winding in the first preset statistical period is greater than the temperature of a second preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
the controlling the compressor in a normal operation state includes:
controlling the compressor to operate at a current compressor frequency when it is determined that the compressor does not have a high-pressure abnormal fault.
2. The method according to claim 1, wherein when the pressure abnormal protection state is a low pressure abnormal protection state, the preset statistical period is a second preset statistical period;
the determining whether the compressor has a pressure abnormal fault according to the temperature of the compressor winding comprises:
judging whether the temperature of the compressor winding in the second preset statistical period is between the temperature of a third preset winding and the temperature of a fourth preset winding or not; the fourth preset winding temperature is greater than the third preset winding temperature;
if yes, determining that the compressor has no low-pressure abnormal fault;
if not, determining that the compressor has a low-pressure abnormal fault.
3. The method of claim 2, wherein said controlling said compressor to execute a pressure anomaly command comprises:
when the compressor is determined to have a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is smaller than the third preset winding temperature, controlling the compressor to increase the frequency of the compressor according to preset control logic;
when it is determined that the compressor has a low-voltage abnormal fault and the winding temperature of the compressor in the second preset statistical period is greater than the winding temperature of the fourth preset winding, controlling the frequency of the compressor to be reduced or controlling the compressor to stop;
the controlling the compressor in a normal operation state includes:
controlling the compressor to operate at a current compressor frequency when it is determined that there is no low pressure abnormal fault in the compressor.
4. A method according to claim 1 or 3, wherein the compressor frequency is calculated by the following set of equations:
F＝λ·Q c ·KT i ·KT o ·KT Δ
wherein F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, Q c For characterizing a preset refrigerating capacity, KT, of the compressor i For characterizing the temperature correction coefficient, KT, in the room in which the compressor is located o For characterizing the outdoor temperature correction coefficient, KT Δ A correction factor for characterizing a difference between the indoor temperature and the target temperature.
5. A fault handling system for a compressor, comprising: the device comprises a pressure detection module, a fault processing module and a compressor;
the pressure detection module and the fault processing module are both connected with the compressor;
the pressure detection module is used for acquiring a pressure value of the compressor and determining a pressure abnormal protection state according to the pressure value;
the fault processing module is applied to the method of any one of claims 1 to 4.
6. The system of claim 5, wherein the fault handling module comprises a fault acquisition module and a calculation module;
the fault acquisition module comprises a low-pressure module, a high-pressure module and a motor winding temperature control module;
the operation module comprises a timer module, an identification module, a confirmation module and an operation module;
the low-pressure module performs low-pressure pd detection and low-pressure fault preliminary judgment and outputs a low-pressure abnormal signal to prevent the compressor from being damaged due to the fact that no refrigerant runs in the system;
the high-pressure module carries out high-pressure pg detection and high-pressure fault preliminary judgment, and outputs a high-pressure abnormal signal when detecting that the high-pressure is higher than a certain value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor of the compressor in real time, comparing the temperature value ti with a certain threshold value field [ tmin, tmax ], and giving control logic for controlling the compressor and outputting a winding temperature value ti if the temperature value ti is between the [ tmin, tmax ];
and the operation module controls the operation of the compressor together according to the three parameters ti, pd and pg.
7. The system of claim 6,
the motor winding temperature control module is used for acquiring a winding temperature value ti of the motor in real time and comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than tmin, the refrigerating system operates according to normal control logic; tmin is more than or equal to ti and less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, the compressor frequency decreases.
8. The system of claim 6, wherein the calculation module comprises a timer module, an identification module, a confirmation module, and an operation module;
the timer module consists of 2 counters J1 and J2 and is used for respectively counting the time length of the fault of the low pressure and the high pressure;
the identification module is used for confirming the fault category after the compressor has a high-pressure fault or a low-pressure fault;
the confirming module is used for confirming whether the real-time winding temperature ti of the compressor is between tmin and tmax;
and the operation module is used for controlling the compressor to stop or operate according to a preset control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T.
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