Intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation

Abstract

The application provides an intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation, and belongs to the field of explosion-proof motors.The system comprises a temperature sensing module, a temperature prediction module, an event classification module, a double-loop heat dissipation control module and a safety protection module.The temperature sensing module is used for acquiring multi-modal sensing data of each monitoring point in real time and processing the data to obtain the fusion temperature of each monitoring point.The temperature prediction module is used for predicting the temperature trend according to the fusion temperature.The event classification module is used for classifying the event level according to the fusion temperature and the predicted temperature, and determining the temperature control event level.The double-loop heat dissipation control module is used for intelligently switching the working state of the heat dissipation loop according to the temperature control event level.The safety protection module is used for continuously monitoring the effect of the double-loop heat dissipation control module, and stopping the explosion-proof motor and starting the emergency heat dissipation protection when the safety protection condition is triggered.The application realizes the reasonable configuration of the overall heat dissipation resources of the explosion-proof motor, improves the heat dissipation effect, and reduces the energy consumption of the explosion-proof motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of explosion-proof motors, in particular to an intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation. BACKGROUND

[0002] Mining explosion-proof motors are the core power devices of fixed equipment in coal mines, and are widely used in key equipment such as mine ventilators, hoists, conveyors, etc. Due to the presence of flammable and explosive gases such as gas and coal dust in coal mines, the surface temperature of explosion-proof motors must be strictly controlled to prevent them from becoming ignition sources and causing gas explosion accidents.

[0003] The environment in coal mines is harsh, with high humidity, strong electromagnetic interference, mechanical vibration, dust pollution and other complex working conditions. Traditional single temperature monitoring methods cannot guarantee measurement accuracy and reliability. At the same time, single heat dissipation circuit design has a risk of failure, and once the heat dissipation system fails, it may cause the motor to overheat and cause safety accidents. Therefore, the development of multi-modal temperature sensing technology and dual-circuit heat dissipation control technology is of great significance to improve the safety of mining explosion-proof motors.

[0004] Chinese patent application No. 202311806319.9 discloses an intelligent control three-phase asynchronous motor, which automatically cleans the motor heat dissipation holes through a dredging and cleaning mechanism. However, its temperature detection uses a single temperature sensor, which cannot meet the strict requirements of explosion-proof motors for temperature monitoring accuracy, and it only has a single heat dissipation circuit, lacking a backup heat dissipation means. SUMMARY

[0005] Therefore, the present application provides an intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation, which solves the defects of single temperature detection and single heat dissipation circuit in the prior art, realizes data fusion of multi-modal sensors, and adopts a dual-circuit heat dissipation architecture with a main heat dissipation circuit and an auxiliary heat dissipation circuit working in cooperation, thereby realizing rational allocation of overall heat dissipation resources of the explosion-proof motor, improving heat dissipation effect, and reducing energy consumption of the explosion-proof motor.

[0006] The technical solution of the present application is as follows: The present application provides an intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation, comprising:

[0007] A temperature sensing module for real-time acquisition of multi-modal sensing data of each monitoring point of the explosion-proof motor based on temperature sensors, processing the multi-modal sensing data using weighted summation to obtain the fusion temperature of each monitoring point;

[0008] A temperature prediction module for temperature trend prediction based on the fusion temperature of each monitoring point to obtain the predicted temperature of each monitoring point;

[0009] The event classification module is used to classify events into levels based on the fused temperature and predicted temperature of each monitoring point, obtain the event level of each monitoring point, and use the highest level priority strategy to determine the temperature control event level of the explosion-proof motor.

[0010] A dual-loop heat dissipation control module is used to intelligently switch the working state of the heat dissipation loop according to the temperature control event level of the explosion-proof motor;

[0011] The safety protection module is used to continuously monitor the effect of the dual-loop heat dissipation control module. When the safety protection conditions are triggered, the explosion-proof motor stops and the emergency heat dissipation protection is activated.

[0012] Based on the above technical solutions, preferably, the monitoring points of the explosion-proof motor include stator winding temperature monitoring points, bearing temperature monitoring points, and housing temperature monitoring points, wherein,

[0013] The stator winding temperature monitoring point is equipped with a three-wire PT100 platinum resistance sensor and a thermocouple sensor.

[0014] The bearing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermocouple sensor.

[0015] The casing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermistor sensor.

[0016] Based on the above technical solutions, the preferred logic for temperature trend prediction is as follows:

[0017] ;

[0018] ;

[0019] in, Represents the i-th monitoring point The predicted temperature value at that moment. Represents the i-th monitoring point The predicted temperature value at that moment. Indicates the prediction time step. This represents the fusion temperature of the i-th monitoring point at the current moment. This represents the fused temperature at the i-th monitoring point at a given historical moment. Indicates a historical time window, This represents the multi-point consistency weight coefficient for the i-th monitoring point. This represents the basic weight of the i-th monitoring point. Indicates the consistency impact coefficient. This represents the standard deviation of the temperature at the i-th monitoring point. This represents the upper limit of the standard deviation of the temperature at the i-th monitoring point.

[0020] On the basis of the above technical scheme, preferably, the event division module comprises a monitoring point event division unit and a comprehensive grade control unit, wherein,

[0021] The monitoring point event division unit is configured to perform grade division according to the fusion temperature and the predicted temperature of the monitoring point, to obtain the event grade of the monitoring point;

[0022] The comprehensive grade control unit is configured to determine the temperature control event grade of the explosion-proof motor based on the highest grade priority strategy for each monitoring point event grade.

[0023] On the basis of the above technical scheme, preferably, the specific steps of the monitoring point event division unit comprise:

[0024] Real-time acquisition of the current fusion temperature, the predicted temperature and the fusion temperature change rate of each monitoring point;

[0025] Setting of the temperature grade threshold and the fusion temperature change threshold according to the thermal characteristic difference of the monitoring points of the explosion-proof motor, division of the current fusion temperature according to the temperature grade threshold of each monitoring point, to obtain the temperature grade of each monitoring point;

[0026] Event grade division according to the temperature grade, the predicted temperature, the fusion temperature change rate and the fusion temperature change threshold of each monitoring point, to obtain the event grade of each monitoring point; wherein the event grade comprises a normal monitoring event, a pre-warning control event, an alarm control event and a critical protection event.

[0027] On the basis of the above technical scheme, preferably, the event grade of each monitoring point is:

[0028] ;

[0029] ;

[0030] ;

[0031] wherein, represents the event grade of the stator winding, represents the event grade of the stator winding, represents the event grade of the casing, represents a normal monitoring event, represents a pre-warning control event, represents an alarm control event, represents a critical protection event, represents the fusion temperature of the stator winding, represents the predicted temperature of the stator winding, represents the fusion temperature of the bearing, a predicted temperature of the bearing, a fusion temperature of the casing, a predicted temperature of the casing.

[0032] On the basis of the above technical solutions, preferably, the explosion-proof motor comprises a main heat dissipation circuit and an auxiliary heat dissipation circuit, wherein,

[0033] The main heat dissipation circuit comprises a main cooling liquid circulating pump, a main flow regulating valve, a main temperature regulator and a main radiator specially used for heat dissipation of the stator winding, the cooling liquid flow of the main heat dissipation circuit is regulated by controlling the rotating speed of the main cooling liquid circulating pump and the opening degree of the main flow regulating valve, and the cooling liquid supply temperature of the main heat dissipation circuit is regulated by controlling the main temperature regulator;

[0034] The auxiliary heat dissipation circuit comprises an auxiliary cooling liquid circulating pump, an auxiliary flow regulating valve, an auxiliary temperature regulator and an auxiliary radiator specially used for heat dissipation of the bearing casing, the cooling liquid flow of the auxiliary heat dissipation circuit is regulated by controlling the rotating speed of the auxiliary cooling liquid circulating pump and the opening degree of the auxiliary flow regulating valve, and the cooling liquid supply temperature of the auxiliary heat dissipation circuit is regulated by controlling the auxiliary temperature regulator.

[0035] On the basis of the above technical solutions, preferably, the double-circuit heat dissipation control module comprises a heat dissipation mode determination unit, a main heat dissipation circuit control unit and an auxiliary heat dissipation circuit control unit, wherein,

[0036] The heat dissipation mode determination unit is used for determining the current heat dissipation circuit working state according to the event level of each monitoring point;

[0037] The main heat dissipation circuit control unit is used for dynamically adjusting the flow and the cooling liquid supply temperature of the main heat dissipation circuit according to the current heat dissipation circuit working state;

[0038] The auxiliary heat dissipation circuit control unit is used for heat dissipation control of the auxiliary heat dissipation circuit in the double-circuit cooperative mode.

[0039] On the basis of the above technical solutions, preferably, the heat dissipation circuit working state comprises a single-circuit mode, a main heat dissipation circuit enhancement mode, a double-circuit cooperative mode and an emergency heat dissipation mode, wherein,

[0040] The single-circuit mode is used for setting the main heat dissipation circuit flow to eighty percent of the rated flow value, and the auxiliary heat dissipation circuit control unit makes the auxiliary heat dissipation circuit in a standby state;

[0041] The main heat dissipation circuit enhancement mode is used for the main heat dissipation circuit control unit to increase the main heat dissipation circuit flow to one hundred and twenty percent to one hundred and fifty percent of the rated flow value, while reducing the cooling liquid supply temperature, and the auxiliary heat dissipation circuit control unit makes the auxiliary heat dissipation circuit continue to remain in the standby state;

[0042] Dual-loop cooperative mode, for main heat dissipation loop control unit and auxiliary heat dissipation loop control unit to work simultaneously;

[0043] Emergency heat dissipation mode, for adjusting the main heat dissipation loop flow to the maximum design value, adjusting the auxiliary heat dissipation loop flow to the maximum design value, adjusting the coolant supply temperature to the lowest controllable temperature, and sending an emergency protection trigger signal to the safety protection module.

[0044] Further preferably, the specific steps of the safety protection module include:

[0045] Based on the current fusion temperature and the predicted temperature of each monitoring point, the current monitoring point temperature deviation is obtained, and according to the current monitoring point temperature deviation and the temperature deviation threshold, when the temperature deviation of the continuous three monitoring points is greater than the temperature deviation threshold, it is determined that the heat dissipation control effect of the dual-loop heat dissipation control module is poor, and the duration of the poor heat dissipation control effect is recorded.

[0046] When the heat dissipation control effect is poor and the duration exceeds three minutes, a first level safety protection measure is adopted for the explosion-proof motor, the dual-loop heat dissipation control module is switched to the maximum heat dissipation capacity mode, the air-cooled heat dissipation equipment is started as a standby heat dissipation equipment, and the output power of the explosion-proof motor is limited to 90% of the rated power to enhance the heat dissipation capacity and reduce the heat load.

[0047] After executing the first level safety protection measure, the fusion temperature of each monitoring point rises, a second level safety protection measure is adopted for the explosion-proof motor, and all available heat dissipation equipment of the explosion-proof motor is started, and the output power of the explosion-proof motor is limited to 70% of the rated power.

[0048] When the second level protection measure is executed, the current fusion temperature of any monitoring point exceeds the temperature safety threshold, a third level safety protection measure is adopted for the explosion-proof motor, the power supply of the explosion-proof motor is cut off, and forced heat dissipation is performed on each monitoring point and a fault alarm is triggered.

[0049] The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-loop heat dissipation of the present application has the following beneficial effects compared with the prior art:

[0050] (1) By predicting temperature and event division based on fusion data, adjusting the heat dissipation strategy in advance according to the prediction result, and implementing hierarchical interlock protection, the response speed and control accuracy of the explosion-proof motor system to temperature abnormalities are significantly improved, the risk of explosion-proof motor failure caused by excessive temperature is effectively reduced, and the safety and reliability of equipment operation are improved;

[0051] (2) By event level division based on temperature prediction results, precise hierarchical identification of different parts running states is realized, the differences in thermal characteristics and safety requirements of each part are fully considered, and the responsiveness and effectiveness of the explosion-proof motor system are improved;

[0052] (3) By adopting a dual-circuit heat dissipation architecture with the main heat dissipation circuit and the auxiliary heat dissipation circuit working together, different heat dissipation modes such as single circuit, main circuit enhancement or dual circuit coordination are intelligently selected according to the event level. This not only ensures the heat dissipation priority of the key monitoring points of the explosion-proof motor, but also realizes the reasonable allocation of the overall heat dissipation resources of the explosion-proof motor, thereby improving the heat dissipation effect and reducing the energy consumption of the explosion-proof motor. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a block diagram of the intelligent explosion-proof motor system based on multimodal temperature sensing and dual-loop heat dissipation of the present invention.

[0055] Figure 2 This is a schematic diagram of the temperature sensing process of the intelligent explosion-proof motor system based on multimodal temperature sensing and dual-loop heat dissipation of the present invention.

[0056] Figure 3 This is a schematic diagram of the event division process of the intelligent explosion-proof motor system based on multimodal temperature sensing and dual-loop heat dissipation of the present invention. Detailed Implementation

[0057] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0058] like Figure 1 As shown, this invention provides an intelligent explosion-proof motor system based on multimodal temperature sensing and dual-loop heat dissipation, comprising:

[0059] The temperature sensing module is used to acquire multimodal sensing data of each monitoring point of the explosion-proof motor in real time based on the temperature sensor, and to process the multimodal sensing data by weighted summation to obtain the fused temperature of each monitoring point.

[0060] The temperature prediction module is used to predict the temperature trend based on the fused temperature of each monitoring point, and obtain the predicted temperature of each monitoring point.

[0061] The event division module is configured to divide events into different levels according to the fusion temperature and the predicted temperature of each monitoring point, obtain the event level of each monitoring point, and determine the temperature control event level of the explosion-proof motor by using a highest level priority strategy.

[0062] The double-loop heat dissipation control module is configured to intelligently switch the working state of the heat dissipation loop according to the temperature control event level of the explosion-proof motor.

[0063] The safety protection module is configured to continuously monitor the effect of the double-loop heat dissipation control module, and stop the explosion-proof motor and start emergency heat dissipation protection when a safety protection condition is triggered.

[0064] The present application converts the traditional passive response temperature control into a predictive active adjustment mode, performs temperature prediction and event division based on fusion data, adjusts the heat dissipation strategy in advance according to the prediction result, and implements hierarchical interlocking protection, thereby significantly improving the response speed and control accuracy of the explosion-proof motor system to temperature abnormalities, effectively reducing the risk of failure of the explosion-proof motor caused by high temperature, and improving the safety and reliability of equipment operation.

[0065] As shown in Figure 2 In an embodiment of the present application, the monitoring points of the explosion-proof motor include a stator winding temperature monitoring point, a bearing temperature monitoring point and a machine shell temperature monitoring point, wherein,

[0066] The stator winding temperature monitoring point is configured with a three-wire PT100 platinum resistance sensor and a thermocouple sensor.

[0067] The bearing temperature monitoring point is configured with a PT100 platinum resistance sensor and a thermocouple sensor.

[0068] The machine shell temperature monitoring point is configured with a PT100 platinum resistance sensor and a thermistor sensor.

[0069] It can be understood that the PT100 platinum resistance sensor has the characteristics of high measurement accuracy and good long-term stability, the measurement range is -200°C to 850°C, the measurement accuracy can reach ±0.1°C, and it is suitable as the main temperature measurement means. The three-wire wiring method can effectively compensate the influence of lead resistance, and ensure that the measurement accuracy is maintained under a longer transmission distance. The three-wire PT100 platinum resistance sensor and the thermocouple sensor are installed at different positions of the stator winding, the PT100 sensor is installed in an area where the winding temperature is relatively stable, and the thermocouple is installed in a position where the temperature changes are more sensitive.

[0070] The PT100 platinum resistance sensor of the machine shell is closely attached to the surface of the machine shell through a specially made heat transfer adhesive, so as to accurately reflect the temperature of the machine shell, and the thermistor sensor is used to monitor the rapid change of the temperature of the machine shell.

[0071] In one embodiment of the present invention, the calculation logic for the fusion temperature of each monitoring point is as follows:

[0072]

[0073] in, Indicates the stator winding at time [time]. The fusion temperature value, This represents the dynamic weighting coefficient of the PT100 platinum resistance sensor at time t in the stator winding monitoring points. This represents the dynamic weighting coefficient of the PT100 platinum resistance sensor at time t in the stator winding monitoring points. This represents the dynamic weighting coefficient of the thermocouple sensor at time t in the stator winding monitoring point. This indicates the temperature measurement value from the thermocouple sensor. Indicates the bearing at time The fusion temperature value, Indicates the bearing at time The fusion temperature value, This represents the dynamic weighting coefficient of the thermocouple sensor at time t in the bearing monitoring point. Indicates the time of the casing The fusion temperature value, This represents the dynamic weighting coefficient of the PT100 platinum resistance sensor at time t in the casing monitoring point. This represents the dynamic weighting coefficient of the thermistor sensor at time t in the casing monitoring point. This indicates the temperature measurement value of the thermistor sensor.

[0074] The weighting coefficients of each monitoring point satisfy the normalization constraint:

[0075]

[0076] This invention employs dynamic weighting for multimodal sensor data fusion, effectively solving the problem of single sensors being susceptible to environmental interference and measurement errors, and significantly improving the accuracy and anti-interference capability of temperature monitoring.

[0077] In one embodiment of the present invention, the logic for predicting the temperature trend is as follows:

[0078] ;

[0079] ;

[0080] in, Represents the i-th monitoring point The predicted temperature value at any given time, where i represents the monitoring point index, i=1 represents the stator winding, i=2 represents the bearing, and i=3 represents the housing. represents the current time, i represents the monitoring point index, i = 1 represents the stator winding, i = 2 represents the bearing, i = 3 represents the casing, t represents the current time, represents the fusion temperature of the i-th monitoring point at the historical time, represents the historical time window, represents the multi-point consistency weight coefficient of the i-th monitoring point, represents the base weight of the i-th monitoring point, represents the consistency influence coefficient, represents the standard deviation of the temperature of the i-th monitoring point, represents the upper limit of the temperature standard deviation of the i-th monitoring point.

[0081] It can be understood that during the operation of the explosion-proof motor, the temperature change of each monitoring point usually has a certain continuity and trend, especially in the working condition with relatively stable load, the temperature change follows the gradual thermodynamic law. By analyzing the current fusion temperature and the historical fusion temperature, the temperature change rate is calculated, that is, , which reflects the temperature change trend of the monitoring point in the historical time window. By multiplying the temperature change rate by the prediction event compensation, the possible temperature change amount in the future time period based on the current trend is obtained. The introduction of the multi-point consistency weight coefficient embodies the dynamic adjustment of the predicted temperature. In the actual operation of the explosion-proof motor, the predictability of temperature change is different under different working conditions. When the temperature fluctuation of a certain monitoring point is small and the change is relatively stable, the prediction based on the historical trend is relatively reliable. When the temperature fluctuation is large, simple linear extrapolation may produce large errors.

[0082] The base weight reflects the reliability of the prediction benchmark of different monitoring points under normal working conditions. In the explosion-proof motor system, the stator winding is the main heat source, and its temperature change is relatively regular. The base weight can be set higher. The bearing temperature is affected by the lubrication state and mechanical wear, and the change is relatively complex. The base weight can be appropriately reduced. The casing temperature reflects the overall thermal state, and the change is relatively lagging but stable. The base weight is between the two. When the explosion-proof motor is running normally, the readings of multiple sensors of the same monitoring point should have good consistency, and the standard deviation is relatively small. When a sensor fails, the contact is poor, or an abnormal working condition occurs, the readings of multiple sensors may deviate greatly, resulting in an increase in the standard deviation. By normalizing the ratio of the maximum standard deviation , the consistency evaluation index is controlled in the range of 0 to 1.

[0083] The ratio of the maximum standard deviation

[0084] This invention achieves accurate prediction of future temperature trends by analyzing historical temperature variation patterns and multi-point correlations. By adjusting the consistency weight, it improves the stability and reliability of the prediction, captures the complex thermal dynamic characteristics of explosion-proof motors, and enables explosion-proof motor systems to take preventive measures before temperature anomalies occur, transforming from passive response to proactive prevention and control.

[0085] In one embodiment of the present invention, the stator winding, as the main heat-generating component of the motor, exhibits rapid temperature response and large temperature fluctuations. Therefore, the time window parameter of the prediction algorithm is... Set to 10 minutes, prediction step size Set to 5 minutes, base weight The value is set to 0.85; bearing temperature changes are mainly affected by mechanical load and lubrication conditions. Temperature changes are relatively stable but may experience sudden increases. The time window parameter for the prediction algorithm is... Set to 20 minutes, prediction step size Set to 10 minutes, base weight Set to 0.75; base weight Set to 0.75; Prediction step size Set to 15 minutes, base weight Set it to 0.7.

[0086] like Figure 3 As shown, in one embodiment of the present invention, the event division module includes a monitoring point event division unit and a comprehensive level control unit, wherein the monitoring point event division unit is used to divide the monitoring point into levels according to the fusion temperature and predicted temperature of the monitoring point to obtain the event level of the monitoring point;

[0087] The monitoring point event classification unit is used to classify the monitoring points according to the fused temperature and predicted temperature to obtain the event level of the monitoring points;

[0088]

[0089] in, This indicates the temperature control event level of the explosion-proof motor system.

[0090] This highest-priority strategy ensures that the explosion-proof motor system can respond promptly to the most serious anomalies, avoiding the risk that local anomalies will be masked by the overall normal state.

[0091] In one embodiment of the present invention, the specific steps of the monitoring point event division unit include:

[0092] Real-time acquisition of current fusion temperature, predicted temperature, and fusion temperature change rate at each monitoring point;

[0093] The temperature grade threshold and the fusion temperature change threshold are set according to the thermal characteristic differences of the monitoring points of the explosion-proof motor, the current fusion temperature is divided according to the temperature grade threshold of each monitoring point, and the temperature grade of each monitoring point is obtained;

[0094] The event grade of each monitoring point is obtained according to the temperature grade, the predicted temperature, the fusion temperature change rate and the fusion temperature change threshold of each monitoring point; wherein the event grade includes a normal monitoring event, a pre-warning control event, an alarm control event and a critical protection event.

[0095] In an embodiment of the present application, the explosion-proof motor is YBX3 series, which is made into an explosion-proof type according to the provisions of GB 3836.1-2021 and GB 3836.2-2021.

[0096] Specifically, when the fusion temperature of the stator winding is below 80 degrees Celsius, the stator winding is in a normal working state, only routine monitoring is performed without the need for special control measures; when the fusion temperature of the stator winding is 80 degrees Celsius to 100 degrees Celsius, the fusion temperature of the stator winding has a temperature rise trend, and a pre-warning needs to be started; when the fusion temperature of the stator winding is 100 degrees Celsius to 110 degrees Celsius, the fusion temperature of the stator winding is already high, and an alarm needs to be started; when the fusion temperature of the stator winding is 110 degrees Celsius and above, the fusion temperature of the stator winding has reached a critical protection level, and immediate forced measures must be taken.

[0097] When the fusion temperature of the bearing is below 60 degrees Celsius, the bearing is running normally; when the fusion temperature of the bearing is 60 degrees Celsius to 75 degrees Celsius, the fusion temperature of the bearing starts to rise, and there may be a trend of increased friction or poor lubrication; when the fusion temperature of the bearing is 75 degrees Celsius to 85 degrees Celsius, the fusion temperature of the bearing is already high, and there is a risk of lubrication failure and mechanical damage; when the fusion temperature of the bearing is 85 degrees Celsius and above, the fusion temperature of the bearing reaches a dangerous level, and immediate forced measures must be taken.

[0098] When the fusion temperature of the casing is below 50 degrees Celsius, the casing surface temperature is moderate and will not affect the explosion-proof safety; when the fusion temperature of the casing is 50 degrees Celsius to 65 degrees Celsius, the fusion temperature of the casing starts to rise, and the overall heat balance condition needs to be concerned; when the fusion temperature of the casing is 65 degrees Celsius to 75 degrees Celsius, the casing temperature is high, which may affect the explosion-proof performance, and heat dissipation control needs to be strengthened; when the fusion temperature of the casing is 75 degrees Celsius and above, the casing temperature reaches a critical point of explosion-proof safety, and immediate forced measures must be taken.

[0099] The application realizes accurate grading identification of running states of different parts by event level division based on temperature prediction results, fully considers the differences of thermal characteristics and safety requirements of each part, and improves the pertinence and effectiveness of explosion-proof motor system response.

[0100] In an embodiment of the application, the event level of each monitoring point is:

[0101] ;

[0102] ;

[0103] ;

[0104] wherein, represents the event level of the stator winding, represents the event level of the bearing, represents the event level of the casing, represents a normal monitoring event, represents a pre-warning control event, represents an alarm control event, represents a critical protection event, represents the fusion temperature of the stator winding, represents the predicted temperature of the stator winding, represents the fusion temperature of the bearing, represents the predicted temperature of the bearing, represents the fusion temperature of the casing, represents the predicted temperature of the casing.

[0105] In an embodiment of the application, the integrated level control unit further comprises a priority dynamic calculation unit for dynamically calculating the priority of the control task based on the event level, and the calculation formula is:

[0106]

[0107]

[0108] wherein, represents the priority value of the control task at time t, represents the basic priority, represents the level amplification coefficient, represents the temperature control event level of the explosion-proof motor system, corresponding to I level = 1, II level = 2, III level = 3, IV level = 4, represents the urgency influence coefficient, represents the urgency evaluation factor, represents the highest fusion temperature in all monitoring points at the current time, represents the emergency evaluation factor, represents the highest fusion temperature in all monitoring points at the current time, represents the critical temperature of the corresponding highest temperature monitoring point, represents the reference upper limit of the temperature change rate, represents the difference between the predicted temperature of the highest temperature monitoring point and the current fusion temperature, represents the maximum allowed temperature change of the corresponding highest temperature monitoring point within the prediction time window.

[0109] It can be understood that, As the basic priority, it provides differentiated starting weights for different types of control tasks. In the explosion-proof motor system, heat dissipation control tasks, safety protection tasks, and monitoring data acquisition tasks have different importance levels. By setting different basic priority values, the explosion-proof motor system can prioritize the execution of critical tasks under limited resources.

[0110] Reflects the dynamic characteristics of temperature changes. In the explosion-proof motor system, even if the current temperature has not reached the danger threshold, if the temperature rises too fast, it may cause serious consequences in a short time. Therefore, by normalizing the change rate evaluation result, the change rate evaluation result is controlled within a reasonable range. The deviation degree between the temperature prediction result and the current state is evaluated. If the predicted temperature rises significantly, It will be larger, indicating that the explosion-proof motor system has a higher risk in the future. By Quantitative evaluation of the relative severity of the prediction risk.

[0111] When the explosion-proof motor system is in normal state ( =I), the basic priority is low, and the emergency evaluation factor is close to 0. At this time About 0.8, the heat dissipation control task runs in energy-saving mode;

[0112] When the system has a warning ( =II), the priority is raised to about 1.6 by the level amplification coefficient, and further adjusted according to the temperature state and the emergency of the change trend to ensure timely response in the warning state;

[0113] When the system reaches the alarm level ( =III), the priority is significantly raised to more than 3.2, and in high emergency situations, it can reach more than 5.0, to ensure that the alarm control event is handled in priority;

[0114] When the system enters the critical protection state ( When the priority reaches the highest level 6.4 or above, in an extreme case, the upper limit value of 10.0, the critical protection event is ensured to be processed with the highest priority.

[0115] The application dynamically calculates the event priority, so that when multiple monitoring points simultaneously appear abnormal, the execution order of the control event task can be reasonably arranged, and the intelligent level and response efficiency of the temperature control of the explosion-proof motor system are improved.

[0116] In an embodiment of the application, the base priority of the heat dissipation control task is 0.8, and the base priority of the safety protection task is 1.0.

[0117] In an embodiment of the application, the level amplification coefficient is 2.

[0118] In an embodiment of the application, the emergency degree influence coefficient is 0.5.

[0119] In an embodiment of the application, the upper limit of the normal temperature of the stator winding is 80°C, the upper limit of the normal temperature of the bearing is 60°C, and the upper limit of the normal temperature of the casing is 50°C.

[0120] In an embodiment of the application, the critical temperature of the stator winding is 110°C, the critical temperature of the bearing is 85°C, and the critical temperature of the casing is 110°C.

[0121] In an embodiment of the application, the reference upper limit of the temperature change rate is 5°C / min.

[0122] In an embodiment of the application, the explosion-proof motor comprises a main heat dissipation circuit and an auxiliary heat dissipation circuit, wherein,

[0123] The main heat dissipation circuit comprises a main cooling liquid circulating pump, a main flow regulating valve, a main temperature regulator, and a main radiator specially used for heat dissipation of the stator winding, the cooling liquid flow of the main heat dissipation circuit is adjusted by controlling the rotating speed of the main cooling liquid circulating pump and the opening degree of the main flow regulating valve, and the cooling liquid supply temperature of the main heat dissipation circuit is adjusted by controlling the main temperature regulator;

[0124] The auxiliary heat dissipation circuit comprises an auxiliary cooling liquid circulating pump, an auxiliary flow regulating valve, an auxiliary temperature regulator, and an auxiliary radiator specially used for heat dissipation of the bearing and the casing, the cooling liquid flow of the auxiliary heat dissipation circuit is adjusted by controlling the rotating speed of the auxiliary cooling liquid circulating pump and the opening degree of the auxiliary flow regulating valve, and the cooling liquid supply temperature of the auxiliary heat dissipation circuit is adjusted by controlling the auxiliary temperature regulator.

[0125] In an embodiment of the application, the double-circuit heat dissipation control module comprises a heat dissipation mode determination unit, a main heat dissipation circuit control unit, and an auxiliary heat dissipation circuit control unit, wherein,

[0126] A heat dissipation mode determination unit is configured to determine the current heat dissipation circuit working state according to the event level of each monitoring point;

[0127] A main heat dissipation circuit control unit is configured to dynamically adjust the flow and the cooling liquid supply temperature of the main heat dissipation circuit according to the current heat dissipation circuit working state;

[0128] An auxiliary heat dissipation circuit control unit is configured to perform heat dissipation control on the auxiliary heat dissipation circuit in the dual-circuit cooperative mode.

[0129] It can be understood that the stator winding priority heat dissipation control is the core of the main heat dissipation circuit control unit. When the stator winding temperature warning occurs, the main heat dissipation circuit control unit immediately enters the stator priority mode, and the explosion-proof motor system automatically adjusts the flow distribution ratio, and more than 70% of the main heat dissipation circuit flow is distributed to the stator heat dissipation circuit, and the supply temperature is reduced to the level close to the ambient temperature. This priority distribution strategy ensures that the most critical part can obtain sufficient heat dissipation resources, and prevents the further rise of the stator winding temperature.

[0130] The auxiliary heat dissipation circuit control unit fully considers the different heat dissipation characteristics of the bearing and the machine shell, and adopts a differentiated control method to achieve the optimal heat dissipation effect. The abnormal bearing temperature is mainly caused by mechanical friction and poor lubrication, so the bearing heat dissipation control of the auxiliary circuit closely cooperates with the lubrication system. When the bearing event level reaches level II, the auxiliary heat dissipation circuit control unit starts the bearing special heat dissipation mode. Due to the characteristics of bearing heat dissipation, moderate cooling strength is required, and excessive cooling may affect the flowability and viscosity characteristics of the lubricating oil, so the auxiliary heat dissipation circuit control unit adopts a relatively mild but continuous adjustment method for the cooling of the bearing. When the bearing temperature prediction shows a continuous rising trend, the auxiliary heat dissipation circuit control unit will start the pre-cooling mode in advance, and the cooling liquid temperature in the bearing area is reduced by 2-3 degrees Celsius, which can effectively prevent the rapid rise of the bearing temperature.

[0131] Since the machine shell heat dissipation is mainly achieved through convective heat transfer, the machine shell heat dissipation control of the auxiliary heat dissipation circuit focuses on maintaining the temperature uniformity of the machine shell surface. When the machine shell event level reaches level II, the auxiliary heat dissipation circuit control unit adjusts the circulation path of the cooling liquid to ensure that the temperature difference of each part of the machine shell is controlled within a reasonable range.

[0132] The application adopts the dual-circuit heat dissipation architecture of the main heat dissipation circuit and the auxiliary heat dissipation circuit, intelligently selects different heat dissipation modes such as single-circuit, main circuit enhancement or dual-circuit cooperation according to the event level, ensures the heat dissipation priority of the key monitoring points of the explosion-proof motor, realizes the reasonable allocation of the overall heat dissipation resources of the explosion-proof motor, improves the heat dissipation effect, reduces the energy consumption of the explosion-proof motor, and avoids the resource waste problem of the traditional fixed mode heat dissipation.

[0133] In an embodiment of the present application, the dual-loop heat dissipation control module further comprises a switching anti-oscillation mechanism, by setting the switching delay and temperature hysteresis interval, to ensure that the mode switching is based on the real temperature trend rather than temporary fluctuations. The condition for upward switching (enhancing the heat dissipation capacity) is relatively sensitive, which can be triggered when the event level is raised and lasts for more than 30 seconds. This fast response design ensures that the explosion-proof motor system can respond to temperature abnormal conditions in time and prevent further deterioration of temperature; the condition for downward switching (reducing the heat dissipation capacity) is relatively conservative, which can be triggered when the event level is reduced and lasts for more than 2 minutes. This conservative strategy prevents premature reduction of heat dissipation capacity caused by temporary temperature drop. The explosion-proof motor system also sets a temperature hysteresis interval, with a difference of 5 degrees Celsius between the upper switching threshold and the lower switching threshold.

[0134] In an embodiment of the present application, the heat dissipation loop working state includes a single-loop mode, a main heat dissipation loop enhancement mode, a dual-loop cooperative mode, and an emergency heat dissipation mode, wherein,

[0135] The single-loop mode is used to set the main heat dissipation loop flow to 80% of the rated flow value, and the auxiliary heat dissipation loop control unit keeps the auxiliary heat dissipation loop in standby state;

[0136] The main heat dissipation loop enhancement mode is used to increase the main heat dissipation loop flow to 120% to 150% of the rated flow value by the main heat dissipation loop control unit, while reducing the cooling liquid supply temperature, and the auxiliary heat dissipation loop control unit keeps the auxiliary heat dissipation loop in standby state;

[0137] The dual-loop cooperative mode is used for the main heat dissipation loop control unit and the auxiliary heat dissipation loop control unit to work simultaneously;

[0138] The emergency heat dissipation mode is used to adjust the main heat dissipation loop flow to the maximum design value, adjust the auxiliary heat dissipation loop flow to the maximum design value, adjust the cooling liquid supply temperature to the lowest controllable temperature, and send an emergency protection trigger signal to the safety protection module.

[0139] It can be understood that the rated flow value is the cooling liquid circulation flow under the normal working state of the explosion-proof motor, which is determined according to the motor power level, and is usually 3-8 L / min. The cooling liquid supply temperature refers to the temperature of the cooling liquid before entering the radiator, and the normal working range is 15-25°C. When the event level of all monitoring points is I level, the working state of the heat dissipation circuit of the explosion-proof motor system is single loop mode, at this time only the main heat dissipation circuit works, providing basic heat dissipation service, and the flow is set to 80% of the standard value, and the main target is to maintain the normal working temperature of the motor. In the single loop mode, the temperature is normal, and the energy saving effect is maximized, the cooling liquid circulation flow is controlled at a low level, and the operating power of the water pump, fan and other equipment of the cooling system is correspondingly reduced. This mode is particularly suitable for light load working conditions or low ambient temperature use scenarios, and can significantly reduce the energy consumption level of the overall explosion-proof motor system.

[0140] When the event level of any monitoring point reaches II level, the working state of the heat dissipation circuit of the explosion-proof motor system automatically switches to the main loop enhancement mode, at this time, the flow of the main heat dissipation circuit is increased to 120% to 150% of the standard value, and the supply temperature is reduced by 3 to 5 degrees Celsius. The main loop enhancement mode focuses on strengthening the heat dissipation control of the stator winding, because the stator winding is usually the first part to have temperature abnormalities and is the key component that has the greatest impact on the performance of the explosion-proof motor. The specific increase in flow is dynamically adjusted according to the specific event level and temperature prediction result, and when the predicted temperature approaches the threshold of a higher level, the flow increase tends to the upper limit of 150%.

[0141] When the event level of any monitoring point reaches III level, or the event level of two or more monitoring points reaches II level at the same time, the working state of the heat dissipation circuit of the explosion-proof motor system starts the double loop cooperative mode, at this time the main heat dissipation circuit and the auxiliary heat dissipation circuit work at full power at the same time, realizing the maximum heat dissipation effect. The double loop cooperative mode is the highest heat dissipation capability state of the explosion-proof motor system, all heat dissipation equipment is put into operation, and the cooling liquid circulation reaches the design limit capability of the explosion-proof motor system. The starting condition of this mode is designed as a single part reaching III level or multiple parts being abnormal at the same time, which ensures timely and effective response to serious temperature abnormality.

[0142] In an embodiment of the present application, the specific steps of the safety protection module include:

[0143] Setting a temperature deviation threshold value;

[0144] Based on the current fusion temperature and the predicted temperature of each monitoring point, the current monitoring point temperature deviation is obtained, according to the current monitoring point temperature deviation and the temperature deviation threshold value, when the temperature deviation of the continuous three monitoring points is greater than the temperature deviation threshold value, it is determined that the heat dissipation control effect of the double loop heat dissipation control module is poor, and the duration of the poor heat dissipation control effect is recorded.

[0145] When the heat dissipation control effect is poor and the duration exceeds three minutes, the first level safety protection measure is adopted for the explosion-proof motor, the double-loop heat dissipation control module is switched to the maximum heat dissipation capacity mode, the air-cooled heat dissipation equipment is started as a standby heat dissipation equipment, and the output power of the explosion-proof motor is limited to 90% of the rated power to enhance the heat dissipation capacity and reduce the heat load;

[0146] When the first level safety protection measure is executed, the fusion temperature of each monitoring point rises, the second level safety protection measure is adopted for the explosion-proof motor, all available heat dissipation equipment of the explosion-proof motor is started, and the output power of the explosion-proof motor is limited to 70% of the rated power;

[0147] When the second level protection measure is executed, the current fusion temperature of any monitoring point exceeds the temperature safety threshold value, the third level safety protection measure is adopted for the explosion-proof motor, the power supply of the explosion-proof motor is cut off, forced heat dissipation is performed on each monitoring point, and a fault alarm is triggered.

[0148] The standby heat dissipation equipment includes an independent air-cooled heat dissipation fan and an external heat dissipation fin, and is in a standby state in normal times.

[0149] In an embodiment of the present application, the temperature safety threshold value of the stator winding is 150 DEG C, the temperature safety threshold value of the bearing is 90 DEG C, and the temperature safety threshold value of the machine shell is 85 DEG C.

[0150] The present application automatically triggers the safety protection measures of corresponding levels by evaluating the control effect and temperature control deviation of the double-loop heat dissipation system in real time, avoids unnecessary shutdown caused by excessive protection, ensures effective protection at critical moments, and improves the intelligent level and reliability of the protection explosion-proof motor system.

[0151] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation, characterized in that: The application relates to a temperature control method for an explosion-proof motor, which comprises the following steps: a temperature sensing module is used to acquire multi-modal sensing data of each monitoring point of the explosion-proof motor in real time based on a temperature sensor, the multi-modal sensing data is processed by weighted summation to obtain fusion temperature of each monitoring point; a temperature prediction module is used to perform temperature trend prediction according to the fusion temperature of each monitoring point to obtain predicted temperature of each monitoring point; the logic of the temperature trend prediction is as follows: ； ； wherein, represents the i-th monitoring point represents the predicted temperature value at the time instant, i represents the monitoring point index, i=1 represents the stator winding, i=2 represents the bearing, i=3 represents the machine casing, represents the current time instant, represents the prediction time step, represents the fused temperature of the i-th monitoring point at the current time instant, represents the fused temperature of the i-th monitoring point at the historical time instant, represents the historical time window, represents the multipoint consistency weight coefficient of the i-th monitoring point, represents the base weight of the i-th monitoring point, represents the consistency influence coefficient, represents the standard deviation of the temperature of the i-th monitoring point, represents the upper limit of the temperature standard deviation of the i-th monitoring point; an event division module is used to perform event level division according to the fusion temperature and the predicted temperature of each monitoring point to obtain the event level of each monitoring point, and a highest level priority strategy is adopted to determine the temperature control event level of the explosion-proof motor; a double-loop heat dissipation control module is used to intelligently switch the working state of a heat dissipation loop according to the temperature control event level of the explosion-proof motor; a safety protection module is used to continuously monitor the effect of the double-loop heat dissipation control module, and the explosion-proof motor is stopped and emergency heat dissipation protection is started when a safety protection condition is triggered.

2. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation of claim 1, wherein: The monitoring points of the explosion-proof motor comprise stator winding temperature monitoring points, bearing temperature monitoring points and machine shell temperature monitoring points, wherein, the stator winding temperature monitoring points are provided with three-wire PT100 platinum resistance sensors and thermocouple sensors; the bearing temperature monitoring points are provided with PT100 platinum resistance sensors and thermocouple sensors; the machine shell temperature monitoring points are provided with PT100 platinum resistance sensors and thermistor sensors.

3. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation as claimed in claim 2, wherein: The event division module comprises a monitoring point event division unit and a comprehensive level control unit, wherein, the monitoring point event division unit is used to perform level division according to the fusion temperature and the predicted temperature of the monitoring point to obtain the event level of the monitoring point; the comprehensive level control unit is used to determine the temperature control event level of the explosion-proof motor by adopting a highest level priority strategy based on the event level of each monitoring point.

4. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation of claim 3, wherein: The specific steps of the monitoring point event division unit comprise: real-time acquisition of current fusion temperature, predicted temperature and fusion temperature change rate of each monitoring point; setting of temperature level threshold values and fusion temperature change threshold values according to the thermal characteristic differences of the monitoring points of the explosion-proof motor, and division of the current fusion temperature according to the temperature level threshold values of the monitoring points to obtain the temperature level of each monitoring point; event level division according to the temperature level, the predicted temperature, the fusion temperature change rate and the fusion temperature change threshold values of each monitoring point to obtain the event level of each monitoring point; wherein the event level comprises normal monitoring events, early warning control events, alarm control events and critical protection events.

5. The intelligent explosion-proof motor system based on multi-modal temperature perception and dual-circuit heat dissipation of claim 4, wherein: The event level of each monitoring point is as follows: ； ； ； wherein represents an event level of the stator winding, represents an event level of the bearing, represents an event level of the housing, represents a normal monitoring event, represents a pre-warning control event, represents an alarm control event, represents a critical protection event, represents a fusion temperature of the stator winding, represents a fusion temperature of the bearing, represents a fusion temperature of the housing, represents a predicted temperature of the stator winding, represents a predicted temperature of the bearing, represents a predicted temperature of the housing.

6. The intelligent explosion-proof motor system based on multi-modal temperature perception and dual-circuit heat dissipation of claim 2, wherein: The explosion-proof motor comprises a main heat dissipation loop and an auxiliary heat dissipation loop, wherein, the main heat dissipation loop comprises a main cooling liquid circulating pump, a main flow regulating valve, a main temperature regulator and a main radiator specially used for stator winding heat dissipation, the cooling liquid flow of the main heat dissipation loop is adjusted by controlling the rotating speed of the main cooling liquid circulating pump and the opening degree of the main flow regulating valve, and the cooling liquid supply temperature of the main heat dissipation loop is adjusted by controlling the main temperature regulator; The auxiliary heat dissipation circuit comprises an auxiliary cooling liquid circulating pump, an auxiliary flow regulating valve, an auxiliary temperature regulator and an auxiliary radiator dedicated to heat dissipation of the bearing casing.

7. The intelligent explosion-proof motor system based on multi-modal temperature perception and dual-circuit heat dissipation as claimed in claim 6, wherein: The double-circuit heat dissipation control module comprises a heat dissipation mode determination unit, a main heat dissipation circuit control unit and an auxiliary heat dissipation circuit control unit, wherein, The heat dissipation mode determination unit is configured to determine the current heat dissipation circuit working state according to the event level of each monitoring point; The main heat dissipation circuit control unit is configured to dynamically adjust the flow and the cooling liquid supply temperature of the main heat dissipation circuit according to the current heat dissipation circuit working state; The auxiliary heat dissipation circuit control unit is configured to perform heat dissipation control on the auxiliary heat dissipation circuit in the double-circuit cooperative mode.

8. The intelligent explosion-proof motor system based on multi-modal temperature perception and dual-circuit heat dissipation of claim 7, wherein: The heat dissipation circuit working state comprises a single-circuit mode, a main heat dissipation circuit enhancement mode, a double-circuit cooperative mode and an emergency heat dissipation mode, wherein, In the single-circuit mode, the main heat dissipation circuit flow is set to eighty percent of the rated flow value, and the auxiliary heat dissipation circuit control unit causes the auxiliary heat dissipation circuit to be in a standby state; In the main heat dissipation circuit enhancement mode, the main heat dissipation circuit control unit increases the main heat dissipation circuit flow to one hundred and twenty percent to one hundred and fifty percent of the rated flow value, while reducing the cooling liquid supply temperature, and the auxiliary heat dissipation circuit control unit causes the auxiliary heat dissipation circuit to continue to remain in the standby state; In the double-circuit cooperative mode, the main heat dissipation circuit control unit and the auxiliary heat dissipation circuit control unit work simultaneously; In the emergency heat dissipation mode, the main heat dissipation circuit flow is adjusted to the maximum design value, the auxiliary heat dissipation circuit flow is adjusted to the maximum design value, the cooling liquid supply temperature is adjusted to the lowest controllable temperature, and an emergency protection trigger signal is sent to the safety protection module.

9. The intelligent explosion-proof motor system based on multi-modal temperature perception and dual-circuit heat dissipation of claim 1, wherein: The specific steps of the safety protection module comprise: Setting a temperature deviation threshold value; Based on the current fusion temperature and the predicted temperature of each monitoring point, a current monitoring point temperature deviation is obtained, and according to the current monitoring point temperature deviation and the temperature deviation threshold value, when the temperature deviations of three consecutive monitoring points are all greater than the temperature deviation threshold value, it is determined that the heat dissipation control effect of the double-circuit heat dissipation control module is poor, and the duration of the poor heat dissipation control effect is recorded; When the heat dissipation control effect is poor and the duration exceeds three minutes, a first-level safety protection measure is adopted for the explosion-proof motor, the double-circuit heat dissipation control module is switched to a maximum heat dissipation capacity mode, a forced air cooling device is started as a backup heat dissipation device, and the output power of the explosion-proof motor is limited to ninety percent of the rated power to enhance the heat dissipation capacity and reduce the heat generation load; After the first-level safety protection measure is executed, the fusion temperature of each monitoring point rises, a second-level safety protection measure is adopted for the explosion-proof motor, and all available heat dissipation devices of the explosion-proof motor are started, and the output power of the explosion-proof motor is limited to seventy percent of the rated power; After the second-level protection measure is executed, when the current fusion temperature of any monitoring point exceeds the temperature safety threshold value, a third-level safety protection measure is adopted for the explosion-proof motor, the power supply of the explosion-proof motor is cut off, and forced heat dissipation is performed on each monitoring point and a fault alarm is triggered.

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