CN113028588A - Fault protection method and system for compressor - Google Patents
Fault protection method and system for compressor Download PDFInfo
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- CN113028588A CN113028588A CN202110351549.5A CN202110351549A CN113028588A CN 113028588 A CN113028588 A CN 113028588A CN 202110351549 A CN202110351549 A CN 202110351549A CN 113028588 A CN113028588 A CN 113028588A
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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
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The embodiment of the invention provides a fault protection method and a fault protection system for a compressor, wherein the method comprises the following steps: acquiring a low-pressure control value and an exhaust temperature value of the compressor; determining a preliminary judgment result of the abnormal fault of the compressor according to the low-pressure control value and the exhaust temperature value; collecting the temperature of a compressor winding in a preset statistical period of the compressor in an abnormal fault state; determining whether the compressor has an abnormal fault according to the temperature of the compressor winding; if the compressor has abnormal faults, controlling the compressor to execute a compressor state abnormal instruction; and if the compressor has no abnormal fault, controlling the compressor to be in a normal running state, and clearing the primary judgment result of the abnormal fault after a preset statistical period. This scheme can improve and carry out fault protection's accuracy to the compressor.
Description
Technical Field
The invention relates to the technical field of compression refrigeration, in particular to a fault protection method and a fault protection system for 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 are used for protecting the system pressure, and the reliability of the compressor refrigerating system is determined by the protection devices of the system pressure.
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, since there are many factors causing a pressure change of the compressor, such as a dirty-up of the evaporator or the condenser, etc., the pressure change is caused, and the compressor has a malfunction due to a temperature change. Therefore, erroneous judgment is likely to occur by performing the compressor control only depending on the pressure change.
Therefore, it is desirable to provide a fault protection scheme for a compressor to solve the above-mentioned deficiencies.
Disclosure of Invention
The embodiment of the invention provides a fault protection method and a fault protection system for a compressor, which can improve the accuracy of fault protection on the compressor.
In a first aspect, an embodiment of the present invention provides a fault protection method for a compressor, including:
acquiring a low-pressure control value and an exhaust temperature value of the compressor;
determining a preliminary judgment result of the abnormal fault of the compressor according to the low pressure control value and the exhaust temperature value;
collecting the temperature of a compressor winding of the compressor in a preset statistical period in the abnormal fault state;
determining whether the compressor has the abnormal fault according to the temperature of the compressor winding;
if the compressor has the abnormal fault, controlling the compressor to execute a compressor state abnormal instruction;
and if the compressor does not have the abnormal fault, controlling the compressor to be in a normal running state, and clearing the primary judgment result of the abnormal fault after the preset statistical period.
In a possible implementation manner, when the preliminary judgment result of the abnormal fault is a low-pressure abnormal fault, the preset statistical period is a first preset statistical period;
the determining whether the compressor has the abnormal fault according to the compressor winding temperature includes:
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 low-pressure abnormal fault;
and if not, determining that the compressor has a low-pressure abnormal fault.
In one possible implementation, the controlling the compressor to execute a compressor state exception instruction includes:
when the compressor is determined to have a low-pressure abnormal fault and the winding temperature of the compressor in the first preset statistical period is smaller than the first 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 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;
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 low pressure abnormality fault.
In a possible implementation manner, when the preliminary judgment result of the abnormal fault is an exhaust temperature abnormal fault, the preset statistical period is a second preset statistical period;
the determining whether the compressor has the abnormal fault according to the compressor winding temperature includes:
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 abnormal fault of the exhaust temperature;
if not, determining that the compressor has an abnormal exhaust temperature fault.
In one possible implementation, the controlling the compressor to execute a compressor state exception instruction includes:
when the compressor is determined to have an abnormal exhaust temperature 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 an abnormal exhaust temperature 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 discharge temperature abnormality fault for the compressor.
In one possible implementation, the compressor frequency is calculated by the following set of equations:
F＝λ·Qc·KTi·KTo·KT△
wherein F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, QcFor characterizing a preset refrigerating capacity, KT, of the compressoriFor characterizing the temperature correction coefficient, KT, in the room in which the compressor is locatedoFor 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 protection system for a compressor, including: the system comprises a pressure sensor, an exhaust temperature sensor, an intelligent control module and a compressor;
the pressure sensor, the exhaust temperature sensor and the intelligent control module are all connected with the compressor;
the pressure sensor is used for detecting the pressure value of the compressor;
the exhaust temperature sensor is used for detecting the exhaust temperature value of the compressor;
the intelligent control module is configured to perform the method of any of the first aspect.
In one possible implementation manner, the intelligent control module comprises a data acquisition module and an operation module;
the data acquisition module comprises a low-voltage control module, an exhaust temperature module and a motor winding temperature control module;
the low-pressure control module is used for detecting the low-pressure pd and primarily judging the low-pressure fault, and outputting a low-pressure control abnormal signal to prevent the compressor from being damaged due to no refrigerant running in the system;
the exhaust temperature module carries out exhaust temperature tp detection and exhaust temperature fault preliminary judgment, and outputs an exhaust temperature abnormal signal when detecting that the exhaust temperature is higher than a certain temperature value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor in real time, 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 ], giving a control logic for controlling the compressor and outputting a winding temperature value ti;
and the operation module controls the operation of the compressor together according to the three parameters of ti, pd and tp.
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 and comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than or equal to tmin, the refrigerating system operates according to normal control logic; tmin < ti is less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, compressor frequency decrease;
and/or the presence of a gas in the gas,
the operation 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 counting the time length of faults of low pressure and exhaust temperature;
the identification module is used for confirming the fault category after the compressor has exhaust fault or 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 control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T and makes a decision on whether a fault is reported.
In one possible implementation manner, the intelligent control module is used in a refrigeration house, an air conditioner or a refrigerator and is provided with a display module, and the intelligent control module is communicated with the display module; the operation module can report faults to the compressor control module and the display module in real time according to operation results; wherein the fault is an exhaust temperature fault or a low pressure fault.
According to the technical scheme, when the fault protection of the compressor is carried out, the low-pressure control value and the exhaust temperature value of the compressor are firstly collected, the judgment result of the abnormal fault of the compressor is preliminarily obtained according to the low-pressure control value and the exhaust temperature value, then the temperature of the winding of the compressor in a certain time period is collected in the abnormal fault state, whether the abnormal fault exists in the compressor is further determined according to the temperature of the winding, and the corresponding control action is carried out on the compressor according to the obtained result. Therefore, when the initial judgment result of the abnormal fault of the compressor is obtained, whether the abnormal fault really exists in the compressor is further determined according to the temperature of the winding of the compressor, so that the accuracy of fault judgment of the compressor can be improved, and the fault protection of the compressor is further realized.
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 flow chart of a method for fault protection of a compressor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an intelligent control module of a compressor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a fault protection system for a compressor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fault protection system for 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 another 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, the failures that often occur in practice are not limited to the high pressure failure and the low pressure failure, but also the factors caused by the pressure change are very many, such as the case where the evaporator or the condenser is dirty, and there is also a failure due to the temperature change of the exhaust gas. Therefore, the compressor can be controlled by only depending on high-pressure and low-pressure detection, and action misjudgment is easy to occur, so that the fault of the compressor cannot be accurately protected.
Therefore, in order to solve the above technical problem, it may be considered that when the compressor has an abnormal fault state, whether the compressor has the abnormal fault is further verified and judged by detecting the winding temperature of the compressor, so as to improve the accuracy of performing fault protection on the compressor.
As shown in fig. 1, the method for fault protection of a compressor provided by the present invention may specifically include the following steps:
step 101: acquiring a low-pressure control value and an exhaust temperature value of the compressor;
step 102: determining a preliminary judgment result of the abnormal fault of the compressor according to the low-pressure control value and the exhaust temperature value;
step 103: collecting the temperature of a compressor winding in a preset statistical period of the compressor in an abnormal fault state;
step 104: determining whether the compressor has an abnormal fault according to the temperature of the compressor winding;
step 105: if the compressor has abnormal faults, controlling the compressor to execute a compressor state abnormal instruction;
step 106: and if the compressor has no abnormal fault, controlling the compressor to be in a normal running state, and clearing the primary judgment result of the abnormal fault after a preset statistical period.
When the compressor has a fault, low-voltage fault or exhaust temperature fault, parameters such as motor power and frequency of the compressor can be changed, and further, the winding temperature of the compressor can be abnormally changed. Based on the above, if the pressure sensor detects that the low pressure is abnormal or the exhaust temperature sensor detects that the exhaust temperature is abnormal and the winding temperature exceeds the set safety range, the compressor is indicated to have a low pressure abnormal fault or an exhaust temperature abnormal fault; likewise, if the winding temperature does not change outside the set safe temperature range, it indicates that the low pressure abnormal state or the discharge temperature abnormal state is not caused by the compressor.
In the embodiment of the invention, when the fault protection of the compressor is carried out, the low-pressure control value and the exhaust temperature value of the compressor are firstly collected, the judgment result of the abnormal fault of the compressor is preliminarily obtained according to the low-pressure control value and the exhaust temperature value, then the winding temperature of the compressor in a certain time period is collected in the abnormal fault state, then whether the abnormal fault exists in the compressor is further determined according to the winding temperature, and the corresponding control action is taken for the compressor according to the obtained result. Therefore, when the initial judgment result of the abnormal fault of the compressor is obtained, whether the abnormal fault really exists in the compressor is further determined according to the temperature of the winding of the compressor, so that the accuracy of fault judgment of the compressor can be improved, and the fault protection of the compressor is further realized.
In step 101 of the embodiment of the present invention, when acquiring the low pressure control value and the exhaust temperature value of the compressor, it may be considered to install a pressure sensor and a temperature sensor on the compressor, and detect the low pressure value state of the compressor in real time through the pressure sensor, so as to determine whether the compressor is in the low pressure abnormal protection state, for example, the low pressure abnormal protection state is when the set pressure value is less than 0.05 MPa. Similarly, the exhaust temperature value condition of the compressor is detected in real time through the temperature sensor, and whether the compressor is in an exhaust temperature abnormal protection state is further determined. For example, the exhaust temperature is set to be less than 35 ℃ or greater than 85 ℃ to be in the exhaust temperature abnormal protection state.
In the embodiment of the invention, a pressure back-off protection mechanism and an exhaust temperature back-off protection mechanism can also be arranged. Namely, by setting the return difference time, when the pressure value or the exhaust temperature value is compared with the preset threshold value, the pressure value or the exhaust temperature value corresponding to the time when the forward returning time is the return difference time at the moment is taken as the current value to be compared with the preset threshold value. That is, if the set backlash time is 3s, for the exhaust temperature rollback protection mechanism, the exhaust temperature value compared with the exhaust temperature threshold interval each time is the exhaust temperature value corresponding to the time to which the previous 3s belongs, and thus the exhaust temperature value is compared with the exhaust temperature threshold, so that the fault protection of the compressor is realized.
When the pressure sensor is used for detecting the pressure and the temperature sensor is used for detecting the exhaust temperature, it is conceivable that a plurality of sensors are mounted on the compressor, and the judgment of the abnormal fault of the compressor is further improved by processing modes such as decision making or averaging of values detected by the plurality of sensors.
In step 103 of the embodiment of the present invention, when the temperature of the compressor winding is collected in the abnormal fault state, it may be considered to install a temperature sensor on the motor of the compressor. When the compressor has abnormal fault, the temperature of the compressor winding in the statistical period is detected by the temperature sensor through presetting the statistical period of the temperature of the compressor winding. Of course, based on the concept of installing multiple sensors as described above, it is also contemplated to install multiple temperature sensors to obtain a more accurate compressor winding temperature.
In the fault protection method of the compressor shown in fig. 1, when the preliminary determination result of the abnormal fault in step 102 is the low pressure abnormal fault, the preset statistical period in step 103 is a first preset statistical period. Then, the step 104 of determining whether the compressor has the 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; the second preset winding temperature is higher than the first 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 the embodiment of the invention, when the low-pressure abnormal fault of the compressor is detected by a pressure sensor and other devices, a timer can be used for timing so as to acquire the temperature of the winding of the compressor in a first preset statistical period, and then whether the temperature of the winding is between the temperature of the first preset winding and the temperature of the second preset winding is judged. If the compressor is located in the middle, the low-pressure abnormity fault does not exist in the compressor, and the reason of the low-pressure abnormity is not caused by the compressor and possibly caused by devices such as a condenser, an evaporator, a fan and the like outside the compressor; if the temperature is out of the first preset winding temperature and the second preset winding temperature, the low-pressure abnormal fault is caused by the compressor.
For example, for a low-pressure abnormal fault, 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 the low pressure abnormal fault occurs, the temperature sensor detects the winding temperature within 5s, and if the detected temperature is between 35 and 85 ℃, the low pressure abnormal fault does not exist; if the detected winding temperature is less than 35 ℃ or more than 85 ℃, the low-pressure abnormal fault exists in the compressor, and the compressor state abnormal instruction needs to be executed for processing.
As shown in fig. 1, in the method for protecting a compressor from a fault, when the preliminary determination result of the abnormal fault determined in step 102 is a low-pressure abnormal fault, the controlling the compressor to execute the compressor state abnormal command in step 105 may specifically include:
when the compressor is determined to have a low-pressure 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 low-pressure 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, including:
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 the embodiment of the invention, the compressor can be protected and the condition of damage to the compressor can be avoided by determining whether the compressor is in a low-pressure abnormal fault, judging the relation 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 low-pressure 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 thus 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 low-pressure 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 low-pressure abnormal fault, the compressor is normal in operation, so that the compressor is only required to be controlled to operate at the current compressor frequency, and thus, 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 low-pressure 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 low-pressure abnormal fault, so that the compressor is controlled to operate at the current compressor frequency.
In the fault protection method of the compressor shown in fig. 1, when the preliminary determination result of the abnormal fault in step 102 is the abnormal fault of the exhaust gas temperature, the preset statistical period in step 103 is a second preset statistical period. Then, the step 104 of determining whether the compressor has the abnormal exhaust temperature fault 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 abnormal fault of the exhaust temperature;
if not, determining that the compressor has an abnormal exhaust temperature fault.
As shown in fig. 1, in the method for protecting a compressor from a fault, when the result of the preliminary determination of the abnormal fault in step 102 is an abnormal exhaust temperature fault, the step 105 of controlling the compressor to execute the pressure abnormal command may specifically include:
when the compressor is determined to have an abnormal exhaust temperature 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 an abnormal exhaust temperature 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:
and controlling the compressor to operate at the current compressor frequency when it is determined that the discharge temperature abnormality fault does not exist in the compressor.
It is easy to understand that the exhaust temperature abnormal fault is the exhaust temperature abnormal fault and the above-mentioned abnormal fault is the low pressure abnormal fault are based on the same inventive concept, in the judgment of the exhaust temperature fault, firstly, the exhaust temperature is obtained, a preliminary exhaust temperature abnormal fault result is obtained, and then, whether the exhaust temperature abnormal fault really exists in the compressor is further determined through the winding temperature. The exhaust temperature abnormal fault will not be described in detail, and specific details may be referred to the low pressure abnormal fault.
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·Qc·KTi·KTo·KT△
where F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, QcA predetermine refrigerating capacity, KT for characterising compressoriFor characterizing the temperature correction coefficient, KT, in the room in which the compressor is locatedoFor characterizing the outdoor temperature correction coefficient, KT△ForA correction factor 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 implementation considers the indoor and outdoor temperatures, thereby fully considering the influence of the external environment and improving the precision of the compressor frequency control.
As shown in fig. 2, an embodiment of the present invention further provides an intelligent control module for a compressor, where the intelligent control module includes: the device comprises an acquisition unit 201, a first determination unit 202, a collection unit 203, a second determination unit 204 and an execution unit 205;
an obtaining unit 201 for obtaining a low pressure control value and an exhaust temperature value of the compressor;
a first determining unit 202, configured to determine a preliminary determination result of an abnormal fault of the compressor according to the low-pressure control value and the exhaust temperature value acquired by the acquiring unit 201;
the acquisition unit 203 is used for acquiring the temperature of the compressor winding in a preset statistical period of the compressor in the state of the abnormal fault determined by the first determination unit 202;
the second determining unit 204 is configured to determine whether the compressor has an abnormal fault according to the compressor winding temperature acquired by the acquiring unit 203;
an execution unit 205, configured to control the compressor to execute the compressor state abnormality instruction if the second determination unit 204 determines that the compressor has the abnormal fault; or if the second determining unit 204 determines that the compressor does not have the abnormal fault, the compressor is controlled to be in the normal operation state, and the preliminary judgment result of the abnormal fault is cleared after the preset statistical period.
In one possible implementation manner, when the initial judgment result of the abnormal fault is the low-pressure abnormal fault, the preset statistical period is a first preset statistical period; the second determination unit 204 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 second preset winding temperature is higher than the first 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 205 is configured to perform the following operations:
when the compressor is determined to have a low-pressure 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 low-pressure 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 low pressure abnormal fault does not exist in the compressor.
In a possible implementation manner, when the preliminary judgment result of the abnormal fault is the abnormal fault of the exhaust temperature, the preset statistical period is a second preset statistical period; a second determining unit 204, 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 abnormal fault of the exhaust temperature;
if not, determining that the compressor has an abnormal exhaust temperature fault.
In one possible implementation, the execution unit 205 is configured to perform the following operations:
when the compressor is determined to have an abnormal exhaust temperature 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 an abnormal exhaust temperature 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;
and controlling the compressor to operate at the current compressor frequency when it is determined that the discharge temperature abnormality fault does not exist in the compressor.
In a possible implementation manner, when the execution unit 205 controls the compressor to perform frequency adjustment, the compressor frequency may be implemented as follows:
F＝λ·Qc·KTi·KTo·KT△
where F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, QcA predetermine refrigerating capacity, KT for characterising compressoriFor characterizing the temperature correction coefficient, KT, in the room in which the compressor is locatedoFor 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 protection system of a compressor, including: a pressure sensor 301, an exhaust gas temperature sensor 302, an intelligent control module 303 and a compressor 304 provided in any of the above device embodiments;
the pressure sensor 301, the exhaust temperature sensor 302 and the intelligent control module 303 are all connected with the compressor 304;
a pressure sensor 301 for detecting a pressure value of the compressor 304;
an exhaust temperature sensor 302 for detecting an exhaust temperature value of the compressor 304;
the intelligent control module 303 is applied to the fault protection method of the compressor provided in any of the above embodiments, and protects the fault of the compressor 304 together with the pressure sensor 301 and the exhaust temperature sensor 302.
In one possible implementation, as shown in fig. 4, the intelligent control module 303 includes a data acquisition module and an operation module;
the data acquisition module comprises a low-voltage control module, an exhaust temperature module and a motor winding temperature control module;
the low-pressure control module performs low-pressure pd detection and low-pressure fault preliminary judgment and outputs a low-pressure control abnormal signal so as to prevent the compressor 304 from being damaged due to the fact that no refrigerant runs in the system;
the exhaust temperature module carries out exhaust temperature tp detection and exhaust temperature fault preliminary judgment, and outputs an exhaust temperature abnormal signal when detecting that the exhaust temperature is higher than a certain temperature value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor in real time, 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 ], giving a control logic for controlling the compressor and outputting a winding temperature value ti;
and the operation module controls the operation of the compressor together according to the three parameters of ti, pd and tp.
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 and comparing the winding temperature value ti with a certain threshold value field [ tmin, tmax ], and if ti is less than or equal to tmin, the refrigerating system operates according to normal control logic; tmin < ti is less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, compressor frequency decrease;
in another possible implementation form of the method,
the operation 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 counting the time length of low-pressure and exhaust temperature faults;
the identification module is used for confirming the fault category after the compressor has exhaust fault or 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 control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T and makes a decision on whether a fault is reported.
In one possible implementation, the intelligent control module 303 is used in a refrigerator, an air conditioner, or a freezer, and has a display module, and the intelligent control module 303 communicates with the display module; the operation module can report faults to the compressor control module and the display module in real time according to operation results; wherein the fault is an exhaust temperature fault or a low pressure fault.
It is to be understood that the illustrated construction of the embodiment of the present invention does not constitute a specific limitation of the fail-safe system of the compressor. In other embodiments of the present invention, the fault protection system for 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.
The information interaction, execution process and other contents between the modules in the system are based on the same concept as the method embodiment of the present invention, and specific contents can be referred to the description in the method embodiment of the present invention, and are not described herein again.
The embodiment of the invention also provides a fault protection device of a compressor, which comprises: 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 method for fault protection 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 protection 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 only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A method of fault protection for a compressor, comprising:
acquiring a low-pressure control value and an exhaust temperature value of the compressor;
determining a preliminary judgment result of the abnormal fault of the compressor according to the low pressure control value and the exhaust temperature value;
collecting the temperature of a compressor winding of the compressor in a preset statistical period in the abnormal fault state;
determining whether the compressor has the abnormal fault according to the temperature of the compressor winding;
if the compressor has the abnormal fault, controlling the compressor to execute a compressor state abnormal instruction;
and if the compressor does not have the abnormal fault, controlling the compressor to be in a normal running state, and clearing the primary judgment result of the abnormal fault after the preset statistical period.
2. The method according to claim 1, wherein when the preliminary determination result of the abnormal fault is a low pressure abnormal fault, the preset statistical period is a first preset statistical period;
the determining whether the compressor has the abnormal fault according to the compressor winding temperature includes:
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 low-pressure abnormal fault;
and 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 compressor condition exception command comprises:
when the compressor is determined to have a low-pressure abnormal fault and the winding temperature of the compressor in the first preset statistical period is smaller than the first 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 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;
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 low pressure abnormality fault.
4. The method according to claim 1, wherein when the preliminary determination result of the abnormal fault is an exhaust temperature abnormal fault, the preset statistical period is a second preset statistical period;
the determining whether the compressor has the abnormal fault according to the compressor winding temperature includes:
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 abnormal fault of the exhaust temperature;
if not, determining that the compressor has an abnormal exhaust temperature fault.
5. The method of claim 4, wherein said controlling said compressor to execute a compressor condition exception command comprises:
when the compressor is determined to have an abnormal exhaust temperature 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 an abnormal exhaust temperature 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 discharge temperature abnormality fault for the compressor.
6. The method of claim 3 or 5, wherein the compressor frequency is calculated by the following set of equations:
F＝λ·Qc·KTi·KTo·KT△
wherein F is used to characterize the compressor frequency, λ is used to characterize the conversion factor for energy and power, QcFor characterizing a preset refrigerating capacity, KT, of the compressoriFor characterizing the temperature correction coefficient, KT, in the room in which the compressor is locatedoFor characterizing the outdoor temperature correction coefficient, KT△A correction factor for characterizing a difference between the indoor temperature and the target temperature.
7. A fault protection system for a compressor, comprising: the system comprises a pressure sensor, an exhaust temperature sensor, an intelligent control module and a compressor;
the pressure sensor, the exhaust temperature sensor and the intelligent control module are all connected with the compressor;
the pressure sensor is used for detecting the pressure value of the compressor;
the exhaust temperature sensor is used for detecting the exhaust temperature value of the compressor;
the intelligent control module for performing the method of any one of claims 1 to 6.
8. The system of claim 7, wherein the intelligent control module comprises a data acquisition module and a calculation module;
the data acquisition module comprises a low-voltage control module, an exhaust temperature module and a motor winding temperature control module;
the low-pressure control module is used for detecting the low-pressure pd and primarily judging the low-pressure fault, and outputting a low-pressure control abnormal signal to prevent the compressor from being damaged due to no refrigerant running in the system;
the exhaust temperature module carries out exhaust temperature tp detection and exhaust temperature fault preliminary judgment, and outputs an exhaust temperature abnormal signal when detecting that the exhaust temperature is higher than a certain temperature value;
the motor winding temperature control module is used for acquiring a temperature value ti of a motor in real time, 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 ], giving a control logic for controlling the compressor and outputting a winding temperature value ti;
and the operation module controls the operation of the compressor together according to the three parameters of ti, pd and tp.
9. The system of claim 8,
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 or equal to tmin, the refrigerating system operates according to normal control logic; tmin < ti is less than or equal to tmax, and the frequency of the refrigeration compressor does not rise any more; ti > tmax, compressor frequency decrease;
and/or the presence of a gas in the gas,
the operation 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 counting the time length of faults of low pressure and exhaust temperature;
the identification module is used for confirming the fault category after the compressor has exhaust fault or 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 control strategy, wherein the control strategy continues to operate or stops the operation of the compressor after a time period T and makes a decision on whether a fault is reported.
10. The system of claim 9,
the intelligent control module is used in a refrigeration house, an air conditioner or a refrigerator and is provided with a display module, and the intelligent control module is communicated with the display module; the operation module can report faults to the compressor control module and the display module in real time according to operation results; wherein the fault is an exhaust temperature fault or a low pressure fault.
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