A method for starting a compressor, an apparatus, a compressor, and an air conditioner.

Abstract

This invention provides a compressor starting method, apparatus, compressor, and air conditioner. By introducing two-stage voltage control and real-time insulation resistance detection, safe starting and reliable operation of the compressor are achieved. When the motor insulation resistance value is lower than a safety threshold, the compressor initially operates at a lower first voltage. By gradually increasing the refrigerant temperature to vaporize it, the motor insulation resistance is increased, ensuring that the system's insulation performance is gradually restored without damaging the motor. Subsequently, after confirming that the motor insulation resistance value has reached the safety threshold, the second voltage is switched to ensure that the compressor operates efficiently under normal working conditions. Through staged voltage control and continuous insulation resistance monitoring, not only are electrical faults caused by excessively low motor insulation resistance effectively avoided, but the overall safety and operational reliability of the compressor are also improved.

Description

Technical Field

[0001] This invention relates to the technical field of compressor design, specifically to a compressor starting method, device, compressor, and air conditioner. Background Technology

[0002] Large semi-hermetic refrigeration compressors can meet large-scale refrigeration needs and are currently widely used in various industrial and commercial refrigeration fields.

[0003] In related technologies, large semi-hermetic refrigeration compressors often suffer from motor damage or malfunctions during initial startup or restart after a long period of inactivity. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a compressor starting method, device, compressor and air conditioner to solve the technical problem that large semi-hermetic refrigeration compressors in related technologies often suffer motor damage or failure when starting for the first time or restarting after a long period of inactivity.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a method for starting a compressor, the method comprising:

[0007] Before starting the compressor, the insulation resistance value of the compressor motor is detected and it is determined whether the motor insulation resistance value reaches the safety threshold.

[0008] If the safety threshold is not reached, the compressor is operated at a first voltage to increase the temperature of the liquid refrigerant inside the compressor, and the motor insulation resistance value is detected during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely if the motor insulation resistance value does not reach the safety threshold.

[0009] Determine whether the detected motor insulation resistance value has reached the safety threshold;

[0010] When the motor insulation resistance reaches a safe threshold, the compressor is operated at a second voltage; wherein the second voltage is higher than the first voltage.

[0011] Secondly, the present invention provides a compressor starting device, the device comprising:

[0012] A detection device is used to detect the motor insulation resistance value of the compressor before starting the compressor and to determine whether the motor insulation resistance value reaches a safe threshold.

[0013] A first operating device is used to operate the compressor at a first voltage to increase the temperature of the liquid refrigerant inside the compressor when the safety threshold is not reached, and to detect the insulation resistance value of the motor during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely when the insulation resistance value of the motor does not reach the safety threshold.

[0014] A judgment device is used to determine whether the detected motor insulation resistance value has reached a safety threshold.

[0015] A second operating device is used to operate the compressor at a second voltage when the motor insulation resistance reaches a safe threshold; wherein the second voltage is higher than the first voltage.

[0016] Thirdly, the present invention provides a compressor, including a compressor controller, wherein the compressor controller controls the compressor according to the method described above.

[0017] Fourthly, the present invention provides an air conditioner, including the above-described device or the above-described compressor.

[0018] Beneficial effects:

[0019] This invention achieves safe startup and reliable operation of the compressor by introducing two-stage voltage control and real-time insulation resistance detection. When the motor insulation resistance value is lower than the safety threshold, the compressor initially operates at a lower first voltage. By gradually increasing the refrigerant temperature to vaporize it, the motor insulation resistance is improved, ensuring that the system's insulation performance is gradually restored without damaging the motor. Subsequently, after confirming that the motor insulation resistance value has reached the safety threshold, the second voltage is switched to ensure that the compressor operates efficiently under normal operating conditions. Through staged voltage control and continuous insulation resistance monitoring, not only are electrical faults caused by excessively low motor insulation resistance effectively avoided, but the overall safety and operational reliability of the compressor are also improved. Attached Figure Description

[0020] Figure 1 This is a schematic flowchart of a compressor start-up method provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic flowchart of a compressor start-up method provided in an embodiment of the present invention;

[0022] Figure 3 This is a block diagram of a compressor starting device provided in an embodiment of the present invention;

[0023] Figure 4 This is a block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0025] Overview:

[0026] In related technologies, large semi-hermetic refrigeration compressors are industrial-grade refrigeration equipment that can be used in large refrigeration systems that require efficient cooling and temperature control, such as cold storage warehouses, industrial refrigeration facilities, and commercial air conditioning systems.

[0027] When a large semi-hermetic refrigeration compressor unit is first filled with refrigerant or restarted after a long period of inactivity, liquid refrigerant may accumulate inside the compressor motor. Especially at the three-phase wiring terminals of the motor, due to the physical properties of refrigerant, its resistance is much lower than that of air. Therefore, when liquid refrigerant accumulates at these terminals, it causes a significant decrease in the motor's insulation resistance. If the liquid refrigerant covers a large area inside the motor, the insulation resistance value may drop below the minimum standard required for electrical safety. In this case, if the motor is started directly, the lower insulation resistance may not be able to effectively isolate voltage, easily leading to voltage breakdown and causing serious abnormalities such as motor damage or even complete destruction.

[0028] To address this technical problem, this embodiment proposes a compressor starting method, apparatus, equipment, and storage medium. By introducing two-stage voltage control and real-time insulation resistance detection, safe startup and reliable operation of the compressor are achieved. When the motor insulation resistance value is lower than the safety threshold, the compressor initially operates at a lower first voltage. By gradually increasing the refrigerant temperature to vaporize it, the motor insulation resistance is improved, ensuring the system's insulation performance is gradually restored without damaging the motor. Subsequently, after confirming that the motor insulation resistance value has reached the safety threshold, the system switches to the rated second voltage to ensure efficient operation of the compressor under normal working conditions. This embodiment, through staged voltage control and continuous insulation resistance monitoring, not only effectively avoids electrical faults caused by excessively low motor insulation resistance but also improves the overall safety and operational reliability of the compressor. This embodiment is particularly suitable for compressors undergoing initial startup or after long-term shutdown, effectively solving the problem of decreased insulation resistance caused by liquid refrigerant accumulation and ensuring safe startup and stable operation of the compressor under various operating conditions.

[0029] Example method:

[0030] like Figure 1As shown, this embodiment provides a method for starting a compressor, the method including:

[0031] Step S102: Before starting the compressor, detect the motor insulation resistance value of the compressor and determine whether the motor insulation resistance value reaches the safety threshold.

[0032] In this embodiment, the compressor can be a large semi-hermetic refrigeration compressor, or other types of compressors, such as a fully hermetic refrigeration compressor. Fully hermetic refrigeration compressors are currently used in household and commercial refrigeration equipment. Because their motor and compression components are completely enclosed in a single housing, when the refrigerant is first added or restarted after a long period of inactivity, liquid refrigerant may accumulate on the motor windings and wiring, leading to a decrease in insulation resistance and creating electrical safety hazards. It can also be a screw compressor, especially a semi-hermetic screw compressor. Alternatively, it can be a scroll compressor with a hermetic or semi-hermetic structure.

[0033] In this embodiment, detecting the motor insulation resistance value of the compressor can be expressed as detecting the motor insulation resistance value of the compressor through a preset device or method.

[0034] For example, the insulation resistance value of the motor can be detected using a preset insulation resistance detection device. Understandably, the compressor has not yet started, and no current is being applied to the motor; therefore, the controller can invoke the preset insulation resistance detection device to detect the motor's insulation resistance value.

[0035] For example, by pre-determining the correspondence between motor insulation resistance values ​​and operating parameters, when it is necessary to test the motor insulation resistance value of a compressor, the current operating parameters are first determined. These parameters can be the current temperature and pressure values ​​of the compressor. Then, based on the pre-determined correspondence between the motor insulation resistance value and the operating parameters, and the current operating parameters, the current motor insulation resistance value is further determined. This correspondence between the motor insulation resistance value and the operating parameters can be pre-determined in various ways. For example, it can be done experimentally. In a laboratory environment, the compressor can be gradually run to achieve various operating parameter conditions, and then the motor insulation resistance value under each condition can be tested. This data is recorded to generate a preliminary experimental dataset. The collected experimental dataset is analyzed and processed to identify the relationship between temperature, pressure, and motor insulation resistance values. Regression analysis, data fitting, and other methods can be used to generate a mathematical mapping model or curve representing the relationship between temperature, pressure, and motor insulation resistance values. Alternatively, simulation methods can be used. Computer simulations of the compressor's operation under different conditions can be used to predict and calculate the motor insulation resistance value, thereby establishing a mapping relationship between temperature, pressure, and insulation resistance values.

[0036] In this embodiment, the motor insulation resistance value can be the insulation resistance value between the three-phase windings of the motor, that is, the insulation resistance value between each phase winding of the motor. If the insulation resistance value between each phase winding of the motor is too low, it may cause a short circuit between the windings, which may damage the motor or cause system failure in severe cases. The motor insulation resistance value can also be the insulation resistance value between the three-phase windings of the motor and ground. If the insulation resistance to ground is too low, it may cause leakage current or an increase in the ground voltage of the motor, resulting in electric shock hazard or damage to electrical equipment.

[0037] In this embodiment, the action of determining whether the motor insulation resistance value has reached a safety threshold can be represented as comparing the detected motor insulation resistance value of the compressor with a preset value. This preset value is the safety threshold. When the detected motor insulation resistance value of the compressor is equal to or greater than the preset value, it can be determined that the safety threshold has been reached. This safety threshold can be determined empirically, for example, by analyzing historical operating data. Specifically, analyzing the historical operating data of the compressor equipment, particularly focusing on the insulation resistance value at which the motor can operate safely and stably, and the insulation resistance value at which failures are likely to occur. Through the analysis of this data, an empirical safety threshold can be determined. This safety threshold can also be determined experimentally.

[0038] In one specific implementation, the safety threshold can be 100 MΩ. Other values ​​are also possible, and this implementation is not limited to any particular value.

[0039] Step S104: If the safety threshold is not reached, the compressor is operated at a first voltage to increase the temperature of the liquid refrigerant inside the compressor, and the motor insulation resistance value is detected during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely when the motor insulation resistance value does not reach the safety threshold.

[0040] In this embodiment, the failure to reach the safety threshold is indicated by the current detection of the compressor's motor insulation resistance value being less than the safety threshold. Further, this motor insulation resistance value being less than the safety threshold can be expressed as either the insulation resistance value between the three-phase windings of the motor or the insulation resistance value between the three-phase windings of the motor and ground being less than the safety threshold. For example, in a specific embodiment, both the insulation resistance value between the three-phase windings of the motor and the insulation resistance value between the three-phase windings of the motor and ground are less than 100 MΩ.

[0041] In this embodiment, the first voltage can be defined as the voltage that allows the motor to operate safely even when the insulation resistance value of the motor has not reached a safe threshold. Therefore, the first voltage can be a safe low voltage lower than the rated operating voltage of the motor. This voltage is low enough to prevent electrical breakdown or short circuits when the insulation resistance is low, thus protecting the motor from potential damage caused by high voltage. By operating the motor at this low voltage, the internal temperature of the motor can be gradually increased without increasing the risk of malfunction or damage, promoting refrigerant vaporization and improving insulation performance.

[0042] In this embodiment, the first voltage can be determined empirically or experimentally. It can be determined comprehensively based on the design characteristics of the equipment, the operating environment, and the tolerance of the insulating material.

[0043] In one specific implementation, the first voltage can be between 10% and 30% of the motor's rated voltage. For example, the first voltage can be 48V.

[0044] In this embodiment, the action of detecting the motor insulation resistance value during operation can be represented as detecting the motor insulation resistance value of the compressor through a preset method.

[0045] In this embodiment, the insulation resistance value of the compressor motor can be detected using various preset methods. For example, it can be achieved by real-time monitoring of current and voltage fluctuations during motor operation, combined with the motor's operating model, to deduce the insulation status of the motor windings. It is understood that the motor's operating model is pre-built. Specifically, insulation degradation leads to distortion of the current waveform or current leakage; therefore, by combining the motor's load, current, and voltage characteristics, the current insulation resistance status can be calculated.

[0046] For example, during motor operation, a high-frequency signal can be injected into the motor windings, and the insulation condition can be analyzed by monitoring the current response of the motor windings to ground. This high-frequency signal can bypass the normal operating voltage and directly measure the state of the insulation layer.

[0047] For example, during motor operation, the temperature gradient of the motor windings can be monitored, and combined with thermodynamic models, the degradation of the winding insulation material can be calculated. Uneven temperature distribution or abnormal temperature rise may indicate insulation problems, which can be detected in real time using preset thermal imaging or multi-point temperature sensors.

[0048] For example, by pre-determining the correspondence between motor insulation resistance values ​​and operating parameters, when it is necessary to test the motor insulation resistance value of the compressor, the current operating parameters are first determined. These operating parameters can be the current temperature and pressure values ​​of the compressor. Then, based on the pre-determined correspondence between motor insulation resistance values ​​and operating parameters, and the current operating parameters, the current motor insulation resistance value is further determined.

[0049] In the above embodiment, by applying a first voltage, the motor can be made to run slowly under safe conditions. This low-voltage operation causes the motor to gradually heat up, thereby raising the temperature of the liquid refrigerant accumulated inside the motor and gradually vaporizing it. As the refrigerant vaporizes, the insulation resistance value of the motor will gradually increase, approaching or reaching the safe threshold.

[0050] Step S106: Determine whether the detected motor insulation resistance value has reached the safety threshold.

[0051] In this embodiment, the judgment action can be expressed as directly comparing the detected motor insulation resistance value with the safety threshold. When the motor insulation resistance value is equal to or greater than the safety threshold, it can be judged that the motor insulation resistance value has reached the safety threshold.

[0052] In this embodiment, the judgment action can be represented by a multi-parameter comparison method. Besides directly comparing the motor insulation resistance value, the judgment action can also be based on a comprehensive assessment of the compressor's current operating parameters. For example, the current compressor temperature and pressure values ​​can be used for a comprehensive judgment. Specifically, it can be determined whether the current compressor temperature and pressure values ​​have reached their optimal values. The optimal temperature value refers to the temperature value at which refrigerant vaporization and insulation resistance reach their best state under known operating conditions. The optimal pressure value refers to the pressure value at which refrigerant vaporization and insulation resistance reach their best state under known operating conditions.

[0053] It is understandable that the aforementioned motor insulation resistance value is calculated using an empirical model. Since the compressor is running, it's impossible to directly call the preset insulation resistance detection device for testing. It is also understandable that in some cases, due to potential discrepancies between the empirical model and actual operating conditions, the calculated insulation resistance value may not be entirely accurate, showing a slight deviation from the actual motor insulation resistance value. Furthermore, it is understandable that since temperature and pressure are directly related to the physical state of the refrigerant, using multi-parameter judgment ensures that the judgment is made when the refrigerant is fully vaporized, thereby reducing the risk of inaccurate insulation resistance calculations. This significantly improves safety during motor startup. In actual operation, when the temperature and pressure reach the refrigerant vaporization point, the calculated insulation resistance result is closer to the true value. Through comprehensive multi-parameter judgment, misjudgments caused by calculation deviations can be reduced, avoiding unnecessary downtime or risks.

[0054] Step S108: When the motor insulation resistance reaches a safe threshold, the compressor is operated at a second voltage; wherein the second voltage is higher than the first voltage.

[0055] In this embodiment, the second voltage can be represented as the voltage used for normal compressor operation after the motor insulation resistance reaches a safe threshold. This second voltage can be the rated operating voltage, which is the standard voltage of the motor under its design operating conditions. This voltage value ensures stable operation of the motor at its rated power and efficiency, driving the compressor to complete the refrigeration cycle under normal operating conditions.

[0056] After initial operation at the first voltage (a lower safety voltage), once it is confirmed that the motor insulation resistance has reached the safety threshold and the refrigerant has been completely vaporized, the compressor is switched to the second voltage. This voltage increase ensures that the motor can operate at or near full load.

[0057] In the above implementation, the safe start-up and reliable operation of the compressor are achieved by introducing two-stage voltage control and real-time insulation resistance detection. When the motor insulation resistance value is lower than the safety threshold, the compressor is first operated at a lower first voltage. By gradually increasing the refrigerant temperature to vaporize it, the motor insulation resistance is increased, ensuring that the system's insulation performance is gradually restored without damaging the motor. Subsequently, after confirming that the motor insulation resistance value has reached the safety threshold, the rated second voltage is switched to ensure that the compressor operates efficiently under normal working conditions. This implementation, through staged voltage control and continuous insulation resistance monitoring, not only effectively avoids electrical faults caused by excessively low motor insulation resistance but also improves the overall safety and operational reliability of the compressor. This implementation is particularly suitable for compressors that are started for the first time or have been shut down for a long time, effectively solving the problem of decreased insulation resistance caused by the accumulation of liquid refrigerant and ensuring the safe start-up and stable operation of the compressor under various operating conditions.

[0058] In some embodiments, the step of detecting the motor insulation resistance value of the compressor before starting the compressor includes:

[0059] The insulation resistance value of the motor is detected using a preset insulation resistance detection device.

[0060] In this embodiment, before starting the compressor, the controller can directly call a preset insulation resistance detection device to detect the insulation resistance value of the motor. This insulation resistance detection device can be a megohmmeter, which can be integrated into the compressor's control cabinet and connected to the motor's terminals via wiring. It can be directly connected to the motor's three-phase terminals or to the motor housing's grounding part to perform insulation resistance detection when the motor is not energized.

[0061] The insulation resistance detection device can also be a built-in insulation monitoring module, which can be installed inside the compressor's control cabinet and directly connected to the compressor motor's terminals. Alternatively, it can be integrated into the compressor motor's end cover to directly monitor the winding's insulation resistance.

[0062] In the above-described embodiments, the insulation resistance value of the motor is detected by a preset insulation resistance detection device before the compressor is started, and it is determined whether the insulation status of the motor meets the safety standard before startup. This can identify and eliminate potential electrical safety hazards before the compressor is started, thereby effectively preventing electrical faults and equipment damage caused by insufficient insulation resistance.

[0063] In some implementations, such as Figure 2 As shown, the step of detecting the insulation resistance value of the motor during operation may include:

[0064] Step S1042: During the operation of the compressor at the first voltage, the pressure and temperature values ​​inside the compressor are detected.

[0065] In this embodiment, the pressure and temperature values ​​inside the compressor can be detected using a preset pressure detection device and a temperature detection device. Specifically, the pressure detection device can be a pressure sensor, and the temperature detection device can be a contact temperature detection device or a non-contact temperature detection device. More specifically, the pressure detection device can be a piezoelectric pressure sensor, a strain gauge pressure sensor, etc. The temperature detection device can be a thermocouple, a resistance temperature detector (RTD), an infrared temperature sensor, etc.

[0066] In some embodiments, the temperature detection device may be a compressor motor winding temperature detection device, capable of detecting the temperature of the compressor motor windings, that is, characterizing the current temperature value inside the compressor by the temperature of the compressor motor windings. Therefore, in this case, the compressor motor winding temperature detection device may be an embedded resistance temperature detector (RTD) or an embedded thermocouple.

[0067] Understandably, on the one hand, the compressor motor windings are a major heat source inside the compressor. During compressor operation, the motor winding temperature is directly affected by the overall temperature inside the compressor and the motor load. Therefore, changes in winding temperature can sensitively reflect the thermal state inside the compressor. On the other hand, motor winding temperature is usually a rapid indicator of changes in the compressor's internal temperature. An increase in winding temperature generally means that the temperature inside the compressor is also rising, especially under heavy load operation or insufficient refrigerant circulation. Moreover, compared to other internal compressor components, the temperature of the motor windings is easier to measure and monitor directly using sensors.

[0068] Step S1044: Determine the current motor insulation resistance value based on the preset data mapping model and the pressure and temperature values ​​inside the compressor; wherein, the data mapping model can characterize the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance value.

[0069] In this embodiment, the data mapping model can be determined in advance through experiments. Specifically, in a laboratory environment, the compressor can be gradually run to achieve various operating parameters, such as the pressure and temperature values ​​within the compressor. The motor insulation resistance value under these various operating parameters is then measured. This data is recorded to generate a preliminary experimental dataset. The collected experimental dataset is analyzed and processed to identify the numerical relationship between temperature, pressure, and motor insulation resistance. Regression analysis, data fitting, and other methods can be used to generate a mathematical mapping model or curve representing the relationship between temperature, pressure, and motor insulation resistance. Alternatively, simulation methods can be used to simulate the compressor's operation under different conditions, predicting and calculating the motor's insulation resistance value, thereby establishing a mapping relationship between temperature, pressure, and insulation resistance.

[0070] In this embodiment, the preset data mapping model can characterize the numerical relationship between the pressure and temperature values ​​inside the compressor and the insulation resistance value of the motor. Therefore, when the current pressure and temperature values ​​inside the compressor are determined, the current pressure and temperature values ​​inside the compressor can be mapped to the corresponding motor insulation resistance values ​​through this data mapping model.

[0071] In the above embodiments, by detecting pressure and temperature values ​​during compressor operation and determining the current motor insulation resistance value based on a preset data mapping model, a method is provided for real-time monitoring of motor insulation status without stopping the machine. By modeling the correspondence between operating parameters and insulation resistance values, the insulation status of the motor can be dynamically and accurately assessed during operation.

[0072] In some implementations, the preset data mapping model includes any one of a data table capable of data mapping, a machine learning model, or a deep learning model.

[0073] In this embodiment, the data table, machine learning model, or deep learning model can be configured in the controller. The data table can be a structured dataset representing the relationship between the compressor's internal pressure, temperature, and motor insulation resistance values. It is understood that this data table is a structured dataset recording the correspondence between the compressor's internal pressure, temperature, and motor insulation resistance values. Therefore, it has a data mapping function. For example, the current motor insulation resistance value can be determined through a direct query method. In one possible implementation, the data table can include multiple parameter values, such as a pressure value field, a temperature value field, and an insulation resistance value field. The pressure value field stores the pressure data inside the compressor, which can be expressed as the absolute pressure inside the compressor (e.g., kPa or psi). This field can include data from multiple pressure measurement points, such as suction pressure and discharge pressure. The temperature value field can store temperature data from different parts inside the compressor, which can be expressed in degrees Celsius (°C). This field can include data from multiple temperature measurement points, such as compressor cavity temperature, refrigerant temperature, and motor winding temperature, etc. The insulation resistance value field stores motor insulation resistance data corresponding to the aforementioned pressure and temperature values, in megaohms (MΩ). This field reflects the insulation condition of the compressor motor under specific operating conditions. The data table can be in two-dimensional form, with the first column storing the pressure value, the second the temperature value, and the third the corresponding insulation resistance value. The data table can exist in a mapping relationship; by inputting the current pressure and temperature values, the corresponding motor insulation resistance value can be quickly found. This mapping relationship can be directly queried or calculated using interpolation.

[0074] In some implementations, the data table may also include a compressor power field. That is, the data table can record the relationship curves between compressor pressure, motor winding temperature, and corresponding motor insulation resistance for units of different power ratings under various operating conditions. Since the operating parameters of compressors with different power ratings vary under different operating conditions, the relationship between motor winding temperature and the corresponding compressor pressure will also change accordingly. For example, in a 400kW unit, when the ambient temperature is 7℃-30℃, the compressor pressure corresponding to a motor winding temperature of 30℃ is 800kPa. In a 600kW unit, when the ambient temperature is 7℃-32℃, the pressure corresponding to a motor winding temperature of 30℃ is 900kPa. This indicates that the critical point for complete refrigerant vaporization is different for units of different power ratings under different operating conditions; therefore, the optimal value for stable motor insulation resistance (>100MΩ) will also differ.

[0075] To ensure data accuracy and applicability, in addition to recording pressure, temperature, and motor insulation resistance values, a power field needs to be added to the data table to record the compressor's power. This expansion allows for a more precise characterization of the operating status of units with different power ratings under various working conditions, helping to determine the optimal motor insulation resistance value under these conditions, thereby improving system safety and reliability.

[0076] In this embodiment, the data in the data table can be obtained from laboratory or field tests, or it can be obtained through computer simulation calculations.

[0077] In this implementation, the machine learning model or deep learning model can be pre-trained. Specifically, first, a dataset is constructed, collecting actual data from the compressor under different operating conditions, including pressure values, temperature values, and corresponding motor insulation resistance values. This data can come from laboratory measurements, field tests, or simulation data. Then, the collected data is formatted into a standard input format, using pressure and temperature values ​​as input features and insulation resistance values ​​as the target variable. Next, the dataset undergoes preprocessing operations, such as handling missing values, outliers, and noise to ensure data quality. Then, the dataset is divided into training and testing sets, and the training set is used to train the model. During training, the model parameters can be optimized by minimizing the loss function or improving prediction accuracy. After training, the performance of the trained model can be tested using the testing set. Finally, after passing the test set test, a machine learning model or deep learning model that can be deployed in the controller is obtained.

[0078] In this embodiment, the model to be trained can be a linear regression model, a support vector machine (SVM) model, or a decision tree model. Alternatively, the model to be trained can be a convolutional neural network (CNN) model, a recurrent neural network (RNN) model, or a long short-term memory network (LSTM) model.

[0079] In the above implementation, by introducing a data mapping model, including any one of data tables, machine learning models, or deep learning models, a variety of flexible and intelligent methods are provided to accurately calculate the motor insulation resistance value during compressor operation. Data table methods are simple and easy to use, suitable for highly predictable operating conditions; machine learning and deep learning models can handle complex nonlinear relationships, adapt to dynamically changing operating conditions, and improve prediction accuracy and system adaptability. This diverse modeling approach allows for the selection of the optimal calculation model based on actual needs, enhancing system robustness and operating efficiency, and effectively improving the safety and reliability of the compressor.

[0080] In some implementations, the data mapping model is a data table configured with optimal temperature values, optimal pressure values, and corresponding motor insulation resistance values; wherein, the optimal temperature value and optimal pressure value represent the conditions under which the motor insulation resistance value reaches a safe threshold when the temperature and pressure values ​​inside the compressor are respectively the optimal temperature value and the optimal pressure value; the step of determining whether the detected motor insulation resistance value has reached the safe threshold includes:

[0081] Determine whether the current temperature value inside the compressor is less than the optimal temperature value in the data table, and whether the current pressure value inside the compressor is less than the optimal pressure value in the data table.

[0082] If the current temperature value inside the compressor is not less than the optimal temperature value in the data table and the current pressure value inside the compressor is not less than the optimal pressure value in the data table, the current motor insulation resistance value is judged to be at the safe threshold.

[0083] This implementation provides a more accurate and reliable judgment method by comparing the current temperature and pressure values ​​inside the compressor with the optimal temperature and pressure values ​​in the data table, rather than directly using the calculated motor insulation resistance value. Since these optimal values ​​are measured when the refrigerant has completely vaporized, they more accurately reflect the actual operating state of the compressor. This multi-parameter indirect judgment method avoids misjudgments caused by inaccurate data mapping model errors, ensuring that the motor insulation resistance value is above the safe threshold, thereby improving the reliability and safety of compressor operation.

[0084] In some implementations, the data mapping model is a data table, which is obtained in advance by the following method:

[0085] During the operation of the compressor at the first voltage, the temperature and pressure values ​​inside the compressor are continuously monitored.

[0086] In this embodiment, the temperature and pressure values ​​inside the compressor can be continuously monitored by invoking the aforementioned preset pressure and temperature detection devices. The temperature value inside the compressor can be the temperature value of a single area within the compressor, such as the temperature of the compressor motor windings. Alternatively, the temperature value inside the compressor can be the temperature values ​​of multiple areas within the compressor, such as the compressor discharge temperature, the compressor suction temperature, the temperature value of the internal cavity of the compressor, or the refrigerant temperature within the compressor. The temperature value inside the compressor can also be the average of the temperature values ​​from the aforementioned multiple areas.

[0087] In this embodiment, the pressure value inside the compressor can be the refrigerant pressure inside the compressor, which reflects the compression state of the refrigerant at different operating stages. Specifically, it can be the suction pressure, discharge pressure, and intermediate pressure, etc. Whenever the temperature inside the compressor rises by a preset temperature value, the current motor insulation resistance value is detected, and the current motor insulation resistance value, along with the current temperature and pressure values ​​inside the compressor, are written into a data table.

[0088] In this embodiment, the various fields of the data table can be defined before writing to the data table, such as temperature value, pressure value, motor insulation resistance value, and timestamp, etc. When the temperature value is detected to rise to a preset temperature increment, the current motor insulation resistance value is detected using an insulation resistance detection device. The currently detected temperature value, pressure value, and motor insulation resistance value are then combined into a data record. Finally, the generated data record is inserted into the next blank row or position in the data table. The writing operation can be manual recording or automated by a programmed interface. In this embodiment, the preset temperature value can be 0.5℃, 1℃, or 1.5℃, etc.

[0089] In this embodiment, detecting the current motor insulation resistance value can be represented as detecting the motor insulation resistance value using a preset insulation resistance detection device. Because this is an experimental scenario, to obtain experimental data, the motor insulation resistance value can be detected by stopping the machine and disconnecting the power supply. Through multiple shutdowns and power-offs, insulation resistance value data of the compressor under different operating conditions are gradually obtained, forming a complete data table.

[0090] At least when the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, at least one set of current motor insulation resistance value, current temperature value inside the compressor, and pressure value are written into the data table to obtain a data table that can characterize the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance value.

[0091] In this embodiment, when the temperature and pressure values ​​inside the compressor reach the critical value for complete vaporization of the liquid refrigerant, a set of current motor insulation resistance values, current compressor temperature values, and pressure values ​​can be written into the data table to obtain a data table that characterizes the numerical relationship between the compressor pressure and temperature values ​​and the motor insulation resistance values. Alternatively, multiple sets of motor insulation resistance values, compressor temperature values, and pressure values ​​can be written to obtain a data table that characterizes the numerical relationship between the compressor pressure and temperature values ​​and the motor insulation resistance values.

[0092] In this embodiment, the temperature and pressure at which the refrigerant completely vaporizes can be calculated in real time using the refrigerant's physical property parameter curves. By comparing these values ​​with the measured temperatures and pressures, the temperature and pressure points at which the refrigerant completely vaporizes can be predicted in real time. These temperature and pressure points at which the refrigerant completely vaporizes are also the critical values ​​at which the temperature and pressure values ​​inside the compressor reach the point where the liquid refrigerant completely vaporizes.

[0093] Understandably, physical property curves are graphs or data tables used to describe the physical properties of refrigerant under different temperature and pressure conditions. These graphs or data tables can include the relationship between the refrigerant's phase (liquid, gaseous), density, specific heat capacity, vapor pressure, melting point, boiling point, etc., and temperature and pressure. Therefore, in actual experiments, the vaporization state of the refrigerant under the current operating condition can be calculated using physical property curves by measuring temperature and pressure in real time. If the temperature and pressure reach the critical point predicted by the curve, it can be determined that the refrigerant has been completely vaporized. Understandably, during compressor operation, the temperature and pressure values ​​inside the compressor will gradually change. To construct the data table, it is necessary to continuously collect temperature, pressure, and motor insulation resistance values; these data will be used to characterize the relationship between the various parameters. The critical value for complete vaporization of liquid refrigerant is a key point. When the temperature and pressure inside the compressor reach this critical value, the physical state of the refrigerant completely changes from liquid to gaseous. This means that there is no longer any liquid refrigerant inside the compressor, and the insulation condition of the motor has stabilized, reflecting a key operating condition inside the compressor. When the temperature and pressure reach the critical value at which the liquid refrigerant is completely vaporized, the collected motor insulation resistance value can accurately reflect the compressor's insulation performance under this critical operating condition. Therefore, it is necessary to collect at least one set of data at this critical point to ensure that the data sheet contains key operating condition information. By collecting data at the critical point, the data sheet can comprehensively cover the entire process from refrigerant not being vaporized to complete vaporization, ensuring the comprehensiveness and accuracy of the relationship between temperature, pressure, and insulation resistance.

[0094] During the experiment, the temperature and pressure inside the compressor will gradually increase, and the insulation resistance value of the motor can be continuously collected. When the temperature and pressure reach the critical value where the liquid refrigerant has completely vaporized, a set of key data can be collected and then further data collection can be stopped. Alternatively, multiple sets of key data can be collected before stopping further data collection.

[0095] In the above implementation, a data table is gradually constructed by dynamically detecting temperature and pressure values ​​during compressor operation at a first voltage, and recording the corresponding motor insulation resistance value each time the temperature rises to a preset value. This method ensures that the data table contains detailed data under various operating conditions, especially recording key data points under the critical condition of complete refrigerant vaporization, which accurately characterizes the relationship between temperature, pressure, and motor insulation resistance. This data table construction method provides more accurate model input, enabling the compressor to make more accurate insulation resistance predictions and safety judgments based on these real-world operating condition data during operation, thereby improving the compressor's reliability and operating efficiency.

[0096] In some embodiments, the step of writing at least one set of current motor insulation resistance values, current compressor temperature values, and pressure values ​​into the data table when the temperature and pressure values ​​inside the compressor reach the critical value for complete vaporization of the liquid refrigerant, thereby obtaining a data table capable of characterizing the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance values, includes:

[0097] When the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, the compressor continues to operate at the first voltage, and N sets of real-time detected motor insulation resistance values, real-time detected temperature and pressure values ​​inside the compressor are written into the data table, where N is a positive integer greater than 0.

[0098] In this embodiment, the N groups can be 10 groups, 20 groups, or 30 groups, etc. The writing of motor insulation resistance values, compressor internal temperature values, and compressor internal pressure values ​​into the data table stops when the last few groups of motor insulation resistance values ​​all reach the safety threshold. Furthermore, the compressor internal temperature and pressure values ​​corresponding to any one of the last few groups of motor insulation resistance values ​​are determined as optimal values, or the average value of the compressor internal temperature and pressure values ​​corresponding to the last few groups of motor insulation resistance values ​​is determined as the optimal value. This results in a data table that characterizes the numerical relationship between the compressor internal pressure and temperature values ​​and the motor insulation resistance values. The optimal value indicates that when the compressor internal temperature and pressure values ​​are the optimal temperature and pressure values, respectively, the motor insulation resistance value has reached the safety threshold.

[0099] In this embodiment, it can be understood that the average value of the temperature and pressure values ​​inside the compressor corresponding to the last few sets of motor insulation resistance values ​​represents the average value of the temperature and the average value of the pressure. In other words, there are two average values. Accordingly, the optimal value should be the optimal temperature value and the optimal pressure value.

[0100] In a possible scenario, when the temperature and pressure reach critical values ​​(80℃, 1000kPa), N sets of data are recorded, where N can be 5 sets, specifically including:

[0101] When the temperature reaches 80℃ and the pressure reaches 1000kPa, the insulation resistance value is recorded as 90MΩ.

[0102] The system continued to operate, with the temperature rising to 82°C and the pressure increasing to 1020 kPa. The insulation resistance value was recorded as 95 MΩ.

[0103] The temperature reached 84℃, the pressure was 1040kPa, and the insulation resistance value was recorded as 100MΩ.

[0104] The temperature reached 86℃, the pressure was 1060kPa, and the insulation resistance value was recorded as 105MΩ.

[0105] Finally, the temperature reached 88℃, the pressure was 1080kPa, and the insulation resistance value was recorded as 110MΩ.

[0106] The insulation resistance values ​​of the last few groups (e.g., 3 groups) all reached or exceeded the safety threshold (assuming the safety threshold is 100MΩ).

[0107] Data table records can be:

[0108] [80℃, 1000kPa, 90MΩ]

[0109] [82℃, 1020kPa, 95MΩ]

[0110] [84℃, 1040kPa, 100MΩ]

[0111] [86℃, 1060kPa, 105MΩ]

[0112] [88℃, 1080kPa, 110MΩ]

[0113] You can choose any one of the last three sets of data as the optimal value. For example, you can choose 88℃ and 1080kPa as the optimal value.

[0114] You can also calculate the average of the temperature and pressure from the last three sets of records.

[0115] In the above implementation, after the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, the compressor continues to operate at the first voltage, and multiple sets of real-time detected motor insulation resistance values, temperature values, and pressure values ​​are recorded to ensure data continuity and accuracy. By recording multiple sets of data and determining that the last few sets of motor insulation resistance values ​​all reach the safety threshold, the optimal temperature and pressure values ​​are finally determined and further recorded in the data table. This method provides an additional safety margin, ensuring that the system's insulation performance remains within a safe range under various operating conditions even when critical operating conditions have been reached, thereby improving the compressor's operational safety and reliability.

[0116] According to an embodiment of the present invention, a compressor starting device is provided; please refer to [link / reference]. Figure 3 The device may include:

[0117] A detection device is used to detect the motor insulation resistance value of the compressor before starting the compressor and to determine whether the motor insulation resistance value reaches a safe threshold.

[0118] A first operating device is used to operate the compressor at a first voltage to increase the temperature of the liquid refrigerant inside the compressor when the safety threshold is not reached, and to detect the insulation resistance value of the motor during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely when the insulation resistance value of the motor does not reach the safety threshold.

[0119] A judgment device is used to determine whether the detected motor insulation resistance value has reached a safety threshold.

[0120] A second operating device is used to operate the compressor at a second voltage when the motor insulation resistance reaches a safe threshold; wherein the second voltage is higher than the first voltage.

[0121] According to an embodiment of the present invention, a compressor is provided, including a compressor controller, wherein the compressor controller controls the compressor according to a compressor start-up method provided in the above embodiments.

[0122] According to an embodiment of the present invention, an air conditioner is provided, including a compressor starting device provided in the above embodiments, or the compressor described above.

[0123] According to an embodiment of the present invention, an electronic device is provided; please refer to... Figure 4The electronic device in this embodiment may include one or more of the following components: a processor, a network interface, memory, non-volatile memory, and one or more application programs, wherein the one or more application programs may be stored in non-volatile memory and configured to be executed by one or more processors, and the one or more programs are configured to perform the methods as described in the foregoing method embodiments.

[0124] According to embodiments of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a computer, causes the computer to perform the method described in any of the above embodiments.

[0125] According to embodiments of the present invention, a computer program product containing instructions is also provided, which, when executed by a computer, cause the computer to perform a compressor starting method according to any of the above embodiments.

[0126] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0127] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0128] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0129] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0130] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for starting a compressor, characterized in that, The method includes: Before starting the compressor, the insulation resistance value of the compressor motor is detected and it is determined whether the motor insulation resistance value reaches the safety threshold. If the safety threshold is not reached, the compressor is operated at a first voltage to increase the temperature of the liquid refrigerant inside the compressor, and the motor insulation resistance value is detected during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely if the motor insulation resistance value does not reach the safety threshold. Determine whether the detected motor insulation resistance value has reached the safety threshold; When the motor insulation resistance reaches a safe threshold, the compressor is operated at a second voltage; wherein the second voltage is higher than the first voltage.

2. The compressor starting method according to claim 1, wherein the step of detecting the motor insulation resistance value of the compressor before starting the compressor includes: The insulation resistance value of the motor is detected using a preset insulation resistance detection device.

3. The compressor starting method according to claim 1, wherein the step of detecting the motor insulation resistance value during operation includes: During the operation of the compressor at the first voltage, the pressure and temperature values ​​inside the compressor are detected. Based on a preset data mapping model and the pressure and temperature values ​​inside the compressor, the current motor insulation resistance value is determined; wherein, the data mapping model can characterize the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance value.

4. The compressor start-up method according to claim 3, wherein the preset data mapping model includes any one of a data table capable of data mapping, a machine learning model, or a deep learning model.

5. The compressor starting method according to claim 4, wherein the data mapping model is a data table, and the data table is configured with optimal temperature value, optimal pressure value, and corresponding motor insulation resistance value; wherein, The optimal temperature and optimal pressure values ​​refer to the conditions under which the motor insulation resistance value reaches the safe threshold when the temperature and pressure values ​​inside the compressor are respectively the optimal temperature and optimal pressure values; the step of determining whether the detected motor insulation resistance value has reached the safe threshold includes: Determine whether the current temperature value inside the compressor is less than the optimal temperature value in the data table, and whether the current pressure value inside the compressor is less than the optimal pressure value in the data table. If the current temperature value inside the compressor is not less than the optimal temperature value in the data table and the current pressure value inside the compressor is not less than the optimal pressure value in the data table, the current motor insulation resistance value is judged to be at the safe threshold.

6. The compressor starting method according to claim 4, wherein the data mapping model is a data table, and the data table is obtained in advance by the following method: During the operation of the compressor at the first voltage, the temperature and pressure values ​​inside the compressor are continuously monitored; When the temperature inside the compressor increases by a preset temperature value, the current motor insulation resistance value is detected and the current motor insulation resistance value, along with the current temperature and pressure values ​​inside the compressor, are written into a data table. At least when the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, at least one set of current motor insulation resistance value, current temperature value inside the compressor, and pressure value are written into the data table to obtain a data table that can characterize the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance value.

7. The compressor starting method according to claim 6, wherein the step of writing at least one set of current motor insulation resistance values, current compressor temperature values, and pressure values ​​into the data table when the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, thereby obtaining a data table capable of characterizing the numerical relationship between the pressure and temperature values ​​inside the compressor and the motor insulation resistance values, comprises: When the temperature and pressure values ​​inside the compressor reach the critical value of complete vaporization of the liquid refrigerant, the compressor continues to operate at the first voltage, and N sets of real-time detected motor insulation resistance values, real-time detected temperature and pressure values ​​inside the compressor are written into the data table; wherein, N is a positive integer greater than 0; Until the last few sets of motor insulation resistance values ​​in the N sets of motor insulation resistance values ​​all reach the safety threshold, the writing of motor insulation resistance values, compressor temperature values, and compressor pressure values ​​into the data table stops. Furthermore, the compressor temperature and pressure values ​​corresponding to any one of the last few sets of motor insulation resistance values ​​are determined as optimal values, or the average value of the compressor temperature and pressure values ​​corresponding to the last few sets of motor insulation resistance values ​​is determined as optimal values. This results in a data table that characterizes the numerical relationship between the compressor pressure and temperature values ​​and the motor insulation resistance values. The optimal value indicates that when the compressor temperature and pressure values ​​are the optimal temperature and optimal pressure values, respectively, the motor insulation resistance value has reached the safety threshold.

8. A compressor starting device, characterized in that, The compressor starting device includes: A detection device is used to detect the motor insulation resistance value of the compressor before starting the compressor and to determine whether the motor insulation resistance value reaches a safe threshold. A first operating device is used to operate the compressor at a first voltage to increase the temperature of the liquid refrigerant inside the compressor when the safety threshold is not reached, and to detect the insulation resistance value of the motor during operation; wherein, the first voltage is the voltage that enables the compressor motor to operate safely when the insulation resistance value of the motor does not reach the safety threshold. A judgment device is used to determine whether the detected motor insulation resistance value has reached a safety threshold. A second operating device is used to operate the compressor at a second voltage when the motor insulation resistance reaches a safe threshold; wherein the second voltage is higher than the first voltage.

9. A compressor, characterized in that, The system includes a compressor controller, which controls the compressor according to any one of the starting methods of claims 1 to 7.

10. An air conditioner, characterized in that, It includes the compressor starting device as described in claim 8 or the compressor as described in claim 9.

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