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

Abstract

The invention 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, and the system comprises a temperature sensing module which is used for obtaining and processing multi-modal sensing data of each monitoring point in real time, and obtaining the fusion temperature of each monitoring point; the temperature prediction module is used for performing temperature trend prediction according to the fusion temperature; the event division module is used for performing event grade division according to the fusion temperature and the predicted temperature and determining a temperature control event grade; the double-loop heat dissipation control module is used for intelligently switching the working state of a heat dissipation loop according to the temperature control event level; and the safety protection module is used for continuously monitoring the effect of the double-loop heat dissipation control module, and when a safety protection condition is triggered, the explosion-proof motor is shut down and emergency heat dissipation protection is started. According to the invention, reasonable configuration of overall heat dissipation resources of the explosion-proof motor is realized, and the energy consumption of the explosion-proof motor is reduced while the heat dissipation effect is improved.

Description

TECHNICAL FIELD

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

[0002] The mine explosion-proof motor is a core power device of the fixed equipment in the coal mine, and is widely applied to key equipment such as mine ventilators, hoists and conveyors. Since flammable and explosive gases such as gas and coal dust exist in the coal mine, the surface temperature of the explosion-proof motor must be strictly controlled to prevent it from becoming an ignition source and causing a gas explosion accident.

[0003] The environment in the coal mine is harsh, and there are complex working conditions such as high humidity, strong electromagnetic interference, mechanical vibration and dust pollution. The traditional single temperature monitoring method cannot guarantee the measurement accuracy and reliability. At the same time, the single heat dissipation loop design has a risk of failure, and once the heat dissipation system fails, it may cause the motor to overheat and cause a safety accident. Therefore, the development of multi-modal temperature sensing technology and double-loop heat dissipation control technology is of great significance to improve the safety of the mine explosion-proof motor.

[0004] The Chinese invention patent with the application number 202311806319.9 discloses an intelligent control three-phase asynchronous motor, which automatically cleans the motor heat dissipation holes through the dredging and cleaning mechanism, but the temperature detection adopts a single temperature sensor, which cannot meet the strict requirements of the explosion-proof motor on temperature monitoring accuracy, and it only has a single heat dissipation loop, 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 double-loop heat dissipation, which solves the defects of single temperature detection and single heat dissipation loop in the prior art, realizes data fusion of multi-modal sensors, adopts a double-loop heat dissipation architecture of main heat dissipation loop and auxiliary heat dissipation loop working in cooperation, realizes reasonable allocation of overall heat dissipation resources of the explosion-proof motor, and reduces the energy consumption of the explosion-proof motor while improving the heat dissipation effect.

[0006] The technical scheme of the present application is as follows: The present application provides an intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation, comprising: A temperature sensing module is configured to acquire multi-modal sensing data of each monitoring point of the explosion-proof motor in real time based on a temperature sensor, process the multi-modal sensing data by weighted summation, and obtain a fusion temperature of each monitoring point. A temperature prediction module is configured to perform temperature trend prediction based on the fusion temperature of each monitoring point, and obtain a predicted temperature of each monitoring point. The event classification module is used to classify events according to the fusion 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; Dual-circuit heat dissipation control module, used to intelligently switch the working state of the heat dissipation circuit according to the temperature control event level of the explosion-proof motor; The safety protection module is used to continuously monitor the effect of the dual-circuit heat dissipation control module. When the safety protection condition is triggered, the explosion-proof motor stops and the emergency heat dissipation protection is activated.

[0007] On the basis of the above technical solution, preferably, the monitoring points of the explosion-proof motor include a stator winding temperature monitoring point, a bearing temperature monitoring point and a casing temperature monitoring point, wherein, The stator winding temperature monitoring point is equipped with a three-wire PT100 platinum resistance sensor and a thermocouple sensor; The bearing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermocouple sensor; The casing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermistor sensor.

[0008] Based on the above technical solution, preferably, the logic of the temperature trend prediction is: ; ; in, Indicates the i-th monitoring point The predicted temperature value at time Indicates the i-th monitoring point The predicted temperature value at time represents the prediction time step, represents the fusion temperature of the i-th monitoring point at the current moment, represents the fusion temperature of the i-th monitoring point at the historical moment, represents the historical time window, represents the multi-point consistency weight coefficient of the i-th monitoring point, represents the basic weight of the i-th monitoring point, represents the consistency influence coefficient, represents the standard deviation of the temperature at the i-th monitoring point, Indicates the upper limit of the standard deviation of the temperature at the i-th monitoring point.

[0009] On the basis of the above technical solution, preferably, the event division module includes a monitoring point event division unit and a comprehensive level control unit, wherein: A monitoring point event classification unit is used to classify the monitoring point according to its fusion temperature and predicted temperature to obtain the event level of the monitoring point; The integrated level control unit is configured to determine the temperature control event level of the explosion-proof motor based on each monitoring point event level by adopting a highest level priority strategy.

[0010] On the basis of the above technical solutions, preferably, the specific steps of the monitoring point event division unit include: Real-time acquisition of the current fusion temperature, predicted temperature and fusion temperature change rate of each monitoring point; Setting temperature level threshold and fusion temperature change threshold according to the thermal characteristic differences of the explosion-proof motor monitoring points, dividing the current fusion temperature according to the temperature level threshold of each monitoring point to obtain the temperature level of each monitoring point; Event level division according to the temperature level, predicted temperature, fusion temperature change rate and fusion temperature change threshold of each monitoring point to obtain the event level of each monitoring point; wherein the event level includes normal monitoring event, early warning control event, alarm control event and critical protection event.

[0011] On the basis of the above technical solutions, preferably, the event level of each monitoring point is: ; ; ; wherein, represents the event level of the stator winding, represents the event level of the stator winding, represents the event level of the casing, represents a normal monitoring event, represents an early 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.

[0012] On the basis of the above technical solutions, preferably, the explosion-proof motor includes a main heat dissipation circuit and an auxiliary heat dissipation circuit, wherein, The main heat dissipation circuit comprises a main cooling liquid circulating pump, a main flow regulating valve, a main temperature regulator and a main heat 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; The auxiliary heat dissipation circuit comprises an auxiliary cooling liquid circulating pump, an auxiliary flow regulating valve, an auxiliary temperature regulator and an auxiliary heat 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.

[0013] On the basis of the above technical scheme, 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, 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; The main heat dissipation circuit control unit is used for dynamically regulating 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 used for heat dissipation control of the auxiliary heat dissipation circuit in the double-circuit cooperative mode.

[0014] On the basis of the above technical scheme, 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, 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; 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; The double-circuit cooperative mode is used for the main heat dissipation circuit control unit and the auxiliary heat dissipation circuit control unit to work simultaneously; The emergency heat dissipation mode is used for adjusting the main heat dissipation circuit flow to the maximum design value, adjusting the auxiliary heat dissipation circuit flow to the maximum design value, adjusting the cooling liquid supply temperature to the lowest controllable temperature, and simultaneously sending an emergency protection trigger signal to the safety protection module.

[0015] More preferably, the specific steps of the safety protection module comprise: A current monitoring point temperature deviation is obtained based on the current fusion temperature and the predicted temperature of each monitoring point, and according to the current monitoring point temperature deviation and a temperature deviation threshold, when the temperature deviations of three continuous monitoring points are all greater than the temperature deviation threshold, 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; 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-loop heat dissipation control module is switched to a maximum heat dissipation capacity mode, a forced air cooling device is started as a standby heat dissipation device, 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 generation load; When 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, all available heat dissipation devices of the explosion-proof motor are started, and the output power of the explosion-proof motor is limited to 70% of the rated power; 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, forced heat dissipation is performed on each monitoring point, and a fault alarm is triggered.

[0016] The intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation has the following beneficial effects compared with the prior art: (1) By predicting the temperature based on fusion data and dividing events, the heat dissipation strategy is adjusted in advance according to the prediction results, and hierarchical interlocking protection is implemented, which significantly improves the response speed and control accuracy of the explosion-proof motor system to temperature abnormalities, effectively reduces the risk of explosion-proof motor failure due to high temperature, and improves the safety and reliability of equipment operation; (2) By dividing events into different levels based on temperature prediction results, accurate hierarchical identification of different part operating states is realized, and the differences in thermal characteristics and safety requirements of each part are fully considered, improving the responsiveness and effectiveness of the explosion-proof motor system; (3) By adopting a double-loop heat dissipation architecture with a main heat dissipation loop and an auxiliary heat dissipation loop, different heat dissipation modes such as single loop, main loop enhancement or double loop cooperation are intelligently selected according to the event level, which not only ensures the heat dissipation priority of the key monitoring points of the explosion-proof motor, but also realizes the rational allocation of the overall heat dissipation resources of the explosion-proof motor, improving the heat dissipation effect while reducing the energy consumption of the explosion-proof motor. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 a block diagram of the intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation of the present application; Figure 2 a temperature sensing flowchart of the intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation of the present application; Figure 3 an event division flowchart of the intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments only constitute some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] As shown in Figure 1 , the present application provides an intelligent explosion-proof motor system based on multi-modal temperature sensing and double-loop heat dissipation, comprising: a temperature sensing module, configured to acquire multi-modal sensing data of each monitoring point of the explosion-proof motor in real time based on a temperature sensor, process the multi-modal sensing data by weighted summation to obtain a fusion temperature of each monitoring point; a temperature prediction module, configured to perform temperature trend prediction according to the fusion temperature of each monitoring point to obtain a predicted temperature of each monitoring point; an event division module, configured to perform event level division according to the fusion temperature and the predicted temperature of each monitoring point to obtain an event level of each monitoring point, and determine a temperature control event level of the explosion-proof motor by using a highest level first strategy; a double-loop heat dissipation control module, configured to intelligently switch the working state of the heat dissipation loop according to the temperature control event level of the explosion-proof motor; a safety protection module, configured to continuously monitor the effect of the double-loop heat dissipation control module, and when a safety protection condition is triggered, the explosion-proof motor is shut down and emergency heat dissipation protection is started.

[0021] The present invention transforms the traditional passive response temperature control into an active adjustment mode based on prediction, performs temperature prediction and event division based on fused data, adjusts the heat dissipation strategy in advance according to the prediction results, and implements hierarchical interlocking protection. It significantly improves the response speed and control accuracy of the explosion-proof motor system to temperature anomalies, effectively reduces the failure risk of explosion-proof motors due to excessive temperature, and improves the safety and reliability of equipment operation.

[0022] like Figure 2 As shown, in one embodiment of the present invention, the monitoring points of the explosion-proof motor include a stator winding temperature monitoring point, a bearing temperature monitoring point and a casing temperature monitoring point, wherein, The stator winding temperature monitoring point is equipped with a three-wire PT100 platinum resistance sensor and a thermocouple sensor; The bearing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermocouple sensor; The casing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermistor sensor.

[0023] As you can understand, the PT100 platinum resistance sensor offers high measurement accuracy and excellent long-term stability. With a measurement range of -200°C to 850°C and an accuracy of ±0.1°C, it is suitable as the primary temperature measurement method. A three-wire wiring system effectively compensates for the effects of lead resistance, ensuring measurement accuracy over long transmission distances. The three-wire PT100 platinum resistance sensor and thermocouple sensors are installed at different locations within the stator winding. The PT100 sensor is installed in an area where the winding temperature is relatively stable, while the thermocouple is installed in a location that is more sensitive to temperature fluctuations.

[0024] The PT100 platinum resistance sensor of the casing is tightly attached to the casing surface through a special heat transfer glue to ensure accurate reflection of the casing temperature. The thermistor sensor is used to monitor the rapid changes in the casing temperature.

[0025] In one embodiment of the present invention, the calculation logic of the fusion temperature of each monitoring point is:

[0026] in, Indicates the stator winding at time The fusion temperature value, It represents the dynamic weight coefficient of the PT100 platinum resistance sensor in the stator winding monitoring point at time t, It represents the dynamic weight coefficient of the PT100 platinum resistance sensor in the stator winding monitoring point at time t, represents the dynamic weight coefficient of the thermocouple sensor in the stator winding monitoring point at time t, Represents the temperature measurement value of the thermocouple sensor, represents the fusion temperature value of the bearing at time represents the fusion temperature value of the bearing at time represents the dynamic weight coefficient of the thermocouple sensor in the bearing monitoring point at time t, represents the fusion temperature value of the casing at time represents the dynamic weight coefficient of the PT100 platinum resistance sensor in the casing monitoring point at time t, represents the dynamic weight coefficient of the thermistor sensor in the casing monitoring point at time t, represents the temperature measurement value of the thermistor sensor.

[0027] The weight coefficients of each monitoring point satisfy the normalization constraint condition:

[0028] The application adopts dynamic weight for multi-modal sensor data fusion, effectively solves the problem that single sensor is easily affected by environmental interference and measurement error, and significantly improves the accuracy and anti-interference ability of temperature monitoring.

[0029] In an embodiment of the application, the logic of the temperature trend prediction is: ; ; wherein, represents the predicted temperature value of the i-th monitoring point at time t, i represents the monitoring point index, i=1 represents the stator winding, i=2 represents the bearing, and i=3 represents the casing, represents the current time, i represents the monitoring point index, i=1 represents the stator winding, i=2 represents the bearing, and i=3 represents the casing, and 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 basic 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.

[0030] ​​​​It can be understood that during the operation of the explosion-proof motor, the temperature change of each monitoring point usually has certain continuity and trend, especially under the working condition that the load is relatively stable, the temperature change follows the progressive thermodynamic law. The temperature change rate calculated by analyzing the current fusion temperature and the historical fusion temperature reflects the temperature change trend of the monitoring point in the historical time window, and the temperature change rate multiplied by the prediction event compensation obtains the possible temperature change amount in the future time period based on the current trend. The introduction of the consistency weight coefficient of multiple points embodies the dynamic adjustment of the predicted temperature. In the actual operation of the explosion-proof motor, the predictability of the temperature change under different working conditions is different. 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 has a large fluctuation, a simple linear extrapolation may produce a large error.

[0031] The basic 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, so the basic weight can be set relatively high. The bearing temperature is affected by the lubrication state and mechanical wear, and the change is relatively complex, so the basic weight can be appropriately reduced. The shell temperature reflects the overall thermal state, and the change is relatively lagging but stable, so the basic weight is between the two. When the explosion-proof motor is normally running, 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 have a large deviation, resulting in an increase in the standard deviation. The consistency evaluation index is normalized by the ratio of the maximum standard deviation to control it in the range of 0 to 1.

[0032] The consistency evaluation index is normalized by the ratio of the maximum standard deviation to control it in the range of 0 to 1.

[0033] The present application realizes accurate prediction of future temperature trends by analyzing the historical change law of temperature and the correlation of multiple points, and improves the stability and reliability of the prediction by adjusting the consistency weight, which can capture the complex thermal dynamic characteristics of the explosion-proof motor, so that the explosion-proof motor system can take preventive measures before temperature abnormalities occur, and change from passive response to active prevention control.

[0034] In an embodiment of the present application, the stator winding is the main heat generating component of the motor, and its temperature change has the characteristics of fast response and large change amplitude, so the time window parameter of the prediction algorithm is set to 10 minutes, the prediction step is set to 5 minutes, and the basic weight is set to 0.85; the bearing temperature change is mainly affected by mechanical load and lubrication conditions, the temperature change is relatively stable but may have a sudden rise, the time window parameter of the prediction algorithm is set to 20 minutes, the prediction step is set to 10 minutes, the base weight is set to 0.75; the base weight is set to 0.75; the prediction step is set to 15 minutes, the base weight is set to 0.7.

[0035] As Figure 3 shown, in an embodiment of the present application, 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 configured 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 monitoring point event division unit is configured 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.

[0036] Among them, represents the temperature control event level of the explosion-proof motor system.

[0037] Through this highest level priority strategy, it is ensured that the explosion-proof motor system can respond to the most serious abnormal situation in time, and the risk of local abnormality being covered by the overall normal state is avoided.

[0038] In an embodiment of the present application, the specific steps of the monitoring point event division unit include: real-time acquisition of the current fusion temperature, the predicted temperature and the fusion temperature change rate of each monitoring point; setting of the temperature level threshold and the fusion temperature change threshold according to the thermal characteristic difference of the explosion-proof motor monitoring point, division of the current fusion temperature according to the temperature level threshold of each monitoring point 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 of each monitoring point to obtain the event level of each monitoring point; wherein the event level includes normal monitoring event, early warning control event, alarm control event and critical protection event.

[0039] In an embodiment of the present application, the explosion-proof motor is YBX3 series, which is made into explosion-proof type according to the provisions of GB 3836.1-2021 and GB 3836.2-2021.

[0040] 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 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 alarm needs to be started; and 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.

[0041] When the fusion temperature of the bearing is below 60 degrees Celsius, the bearing is in a normal working state; 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; and 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.

[0042] When the fusion temperature of the machine shell is below 50 degrees Celsius, the surface temperature of the machine shell is moderate and will not affect the explosion-proof safety; when the fusion temperature of the machine shell is 50 degrees Celsius to 65 degrees Celsius, the fusion temperature of the machine shell starts to rise, and the overall heat balance needs to be concerned; when the fusion temperature of the machine shell is 65 degrees Celsius to 75 degrees Celsius, the temperature of the machine shell is high and may affect the explosion-proof performance, and heat dissipation control needs to be strengthened; and when the fusion temperature of the machine shell is 75 degrees Celsius and above, the temperature of the machine shell reaches a critical point of explosion-proof safety, and immediate forced measures must be taken.

[0043] The present application realizes accurate hierarchical identification of the running states of different parts by event level division based on temperature prediction results, fully considers the differences in thermal characteristics and safety requirements of each part, and improves the pertinence and effectiveness of the response of the explosion-proof motor system.

[0044] In an embodiment of the present application, the event level of each monitoring point is: ; ; ; Among them, represents the event level of the stator winding, represents the event level of the bearing, represents the event level of the machine shell, represents a normal monitoring event, Indicates early warning control events, Indicates alarm control events, Indicates 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, Indicates the fusion temperature of the casing, Indicates the predicted temperature of the chassis.

[0045] In one embodiment of the present invention, the comprehensive level control unit further includes a priority dynamic calculation unit for dynamically calculating the priority of the control task based on the event level, and the calculation formula is:

[0046]

[0047] in, represents the priority value of the control task at time t, Indicates the basic priority, Indicates the level magnification factor, Indicates the temperature control event level of the explosion-proof motor system, corresponding to level I = 1, level II = 2, level III = 3, level IV = 4, represents the urgency impact coefficient, represents the urgency assessment factor, Indicates the highest fusion temperature among all monitoring points at the current moment, represents the urgency assessment factor, Indicates the highest fusion temperature among all monitoring points at the current moment, Indicates the critical temperature corresponding to the highest temperature monitoring point, Indicates the reference upper limit of the temperature change rate, Indicates the difference between the predicted temperature of the highest temperature monitoring point and the current fusion temperature, Indicates the maximum allowable temperature change of the corresponding highest temperature monitoring point within the prediction time window.

[0048] Understandably, As the basic priority, differentiated starting weights are provided for different types of control tasks. In the explosion-proof motor system, heat dissipation control tasks, safety protection tasks, monitoring data collection tasks, etc. have different levels of importance. By setting different basic priority values, the explosion-proof motor system can prioritize the execution of critical tasks when resources are limited.

[0049] Reflects the dynamic characteristics of temperature change, in the explosion-proof motor system, even if the current temperature has not reached the dangerous threshold, but if the temperature rises too fast, it may cause serious consequences in a short time, therefore, through the normalization processing makes the change rate evaluation results control in reasonable range. The deviation degree of temperature prediction result and 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 predicted risk.

[0050] When the explosion-proof motor system is in normal state ( =I), the basic priority is low, the urgency evaluation factor is close to 0, at this time About 0.8, the heat dissipation control task runs in energy saving mode; When the system appears early warning ( =II), the grade amplification coefficient makes the priority rise to about 1.6, and is further adjusted according to the temperature state and the urgency of the change trend, to ensure timely response in the early warning state; When the system reaches the alarm level ( =III), the priority is significantly improved to more than 3.2, and can reach more than 5.0 in high urgency, to ensure that the alarm control event is processed in priority; When the system enters the critical protection state ( =IV), the priority reaches the highest level of more than 6.4, and can reach the upper limit value of 10.0 in extreme cases, to ensure that the critical protection event is processed with the highest priority.

[0051] The present application can reasonably arrange the execution order of the control event task when multiple monitoring points appear abnormal at the same time by dynamic calculation of event priority, and improves the intelligent level and response efficiency of the explosion-proof motor system temperature control.

[0052] In an embodiment of the present application, the basic priority of the heat dissipation control task is 0.8, and the basic priority of the safety protection task is 1.0.

[0053] In an embodiment of the present application, the grade amplification coefficient Is 2.

[0054] In an embodiment of the present application, the urgency influence coefficient Is 0.5.

[0055] In an embodiment of the present application, the normal upper limit of the temperature of the stator winding is 80°C, the normal upper limit of the temperature of the bearing is 60°C, and the normal upper limit of the temperature of the casing is 50°C.

[0056] In an embodiment of the present 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.

[0057] In an embodiment of the present application, the reference upper limit of the temperature change rate is 5°C / min.

[0058] In an embodiment of the present application, the explosion-proof motor comprises a main heat dissipation circuit and an auxiliary heat dissipation circuit, wherein, 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; 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 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.

[0059] In an embodiment of the present 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, 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; 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; 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.

[0060] 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 temperature early warning of the stator winding occurs, the main heat dissipation circuit control unit immediately enters the stator priority mode, 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 cooling liquid 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 temperature of the stator winding.

[0061] The auxiliary heat dissipation loop control unit fully considers the different heat dissipation characteristics of the bearing and the casing, 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 loop is closely coordinated with the lubrication system. When the bearing event level reaches level II, the auxiliary heat dissipation loop control unit starts the bearing special heat dissipation mode. Due to the characteristics of bearing heat dissipation, moderate cooling strength is needed, and excessive cooling may affect the flowability and viscosity characteristics of the lubricating oil. Therefore, the auxiliary heat dissipation loop 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 loop control unit will start the pre-cooling mode in advance, and the temperature of the cooling liquid in the bearing area will be reduced by 2-3 degrees Celsius, which can effectively prevent the rapid rise of the bearing temperature.

[0062] Since the casing heat dissipation is mainly achieved through convective heat transfer, the casing heat dissipation control of the auxiliary heat dissipation loop focuses on maintaining the temperature uniformity of the casing surface. When the casing event level reaches level II, the auxiliary heat dissipation loop control unit adjusts the circulation path of the cooling liquid to ensure that the temperature difference of each part of the casing is controlled within a reasonable range.

[0063] The present application adopts a double-loop heat dissipation architecture of division and cooperation of the main heat dissipation loop and the auxiliary heat dissipation loop, intelligently selects different heat dissipation modes such as single loop, main loop enhancement or double loop 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.

[0064] In an embodiment of the present application, the double-loop heat dissipation control module further includes a switching anti-oscillation mechanism, which sets a switching delay and a temperature hysteresis interval to ensure that the mode switching is based on the real temperature trend rather than temporary fluctuations. The upward switching (enhancing the heat dissipation capacity) condition is relatively sensitive, and it can be triggered when the event level is improved 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 the temperature. The downward switching (reducing the heat dissipation capacity) condition is relatively conservative, and it can be triggered only when the event level is reduced and lasts for more than 2 minutes. This conservative strategy prevents the premature reduction of the heat dissipation capacity caused by the temporary decrease of the temperature. The explosion-proof motor system also sets a temperature hysteresis interval, and a difference of 5 degrees Celsius is set between the up-switching threshold and the down-switching threshold.

[0065] 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 double loop cooperation mode and an emergency heat dissipation mode, wherein, Single loop mode, for setting the main heat dissipation loop flow rate to 80% of the rated flow rate value, the auxiliary heat dissipation loop control unit keeps the auxiliary heat dissipation loop in standby state; Main heat dissipation loop enhancement mode, for the main heat dissipation loop control unit to increase the main heat dissipation loop flow rate to 120% to 150% of the rated flow rate value, while reducing the coolant supply temperature, and the auxiliary heat dissipation loop control unit keeps the auxiliary heat dissipation loop in standby state; Dual loop cooperative mode, for the main heat dissipation loop control unit and the auxiliary heat dissipation loop control unit to work simultaneously; Emergency heat dissipation mode, for adjusting the main heat dissipation loop flow rate to the maximum design value, adjusting the auxiliary heat dissipation loop flow rate 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.

[0066] It can be understood that the rated flow rate value is the coolant circulation flow rate in 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 coolant supply temperature refers to the temperature of the coolant 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 heat dissipation loop working state of the explosion-proof motor system is single loop mode, at this time only the main heat dissipation loop works, providing basic heat dissipation service, the flow rate is set to 80% of the standard value, and the main target is to maintain the normal working temperature of the motor. In single loop mode, the maximum energy saving effect is achieved under normal temperature conditions, the coolant circulation flow rate 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.

[0067] When the event level of any monitoring point reaches II level, the heat dissipation loop working state of the explosion-proof motor system automatically switches to main loop enhancement mode, at this time, the main heat dissipation loop flow rate 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 appear 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 rate is dynamically adjusted according to the specific event level and temperature prediction results, and when the predicted temperature approaches the threshold of a higher level, the flow rate increase tends to the upper limit of 150%.

[0068] When the event level of any monitoring point reaches level III, or the event levels of two or more monitoring points reach level II at the same time, the heat dissipation circuit working state of the explosion-proof motor system starts the double-circuit cooperative mode, at this time the main heat dissipation circuit and the auxiliary heat dissipation circuit work at full power at the same time, and the maximum heat dissipation effect is realized. The double-circuit 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 level III or multiple parts being abnormal at the same time, which ensures timely and effective response to serious temperature abnormality.

[0069] In an embodiment of the present application, the specific steps of the safety protection module include: setting a temperature deviation threshold value; obtaining a current monitoring point temperature deviation based on the current fusion temperature and the predicted temperature of each monitoring point, and when the temperature deviations of three consecutive monitoring points are all greater than the temperature deviation threshold value, determining that the heat dissipation control effect of the double-circuit heat dissipation control module is poor, and recording the duration of the poor heat dissipation control effect; when the heat dissipation control effect is poor and the duration exceeds three minutes, adopting a first-level safety protection measure for the explosion-proof motor, switching the double-circuit heat dissipation control module to the maximum heat dissipation capability mode, starting the air-cooled heat dissipation equipment as a standby heat dissipation equipment, and limiting the output power of the explosion-proof motor to 90% of the rated power to enhance the heat dissipation capability and reduce the heat load; after executing the first-level safety protection measure, the fusion temperature of each monitoring point rises, adopting a second-level safety protection measure for the explosion-proof motor, starting all available heat dissipation equipment of the explosion-proof motor, and limiting the output power of the explosion-proof motor to 70% of the rated power; after executing the second-level protection measure, the current fusion temperature of any monitoring point exceeds the temperature safety threshold value, adopting a third-level safety protection measure for the explosion-proof motor, cutting off the power supply of the explosion-proof motor, forcibly cooling each monitoring point, and triggering a fault alarm.

[0070] The standby heat dissipation equipment includes an independent air-cooled heat dissipation fan and an external heat sink, and is in a standby state in normal times.

[0071] In an embodiment of the present application, the temperature safety threshold value of the stator winding is 150℃, the temperature safety threshold value of the bearing is 90℃, and the temperature safety threshold value of the machine shell is 85℃.

[0072] The present application automatically triggers the corresponding level of safety protection measures by real-time evaluation of the control effect and temperature control deviation of the double-circuit heat dissipation system, avoids unnecessary shutdown caused by excessive protection, ensures effective protection at critical moments, and improves the intelligent level and reliability of protecting the explosion-proof motor system.

[0073] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. 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 by: include: The temperature sensing module is used to obtain multimodal sensing data of each monitoring point of the explosion-proof motor in real time based on the temperature sensor, and process the multimodal sensing data using weighted summation to obtain the fused temperature of each monitoring point; The temperature prediction module is used to predict the temperature trend based on the fusion temperature of each monitoring point to obtain the predicted temperature of each monitoring point; The event classification module is used to classify events according to the fusion 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; Dual-circuit heat dissipation control module, used to intelligently switch the working state of the heat dissipation circuit according to the temperature control event level of the explosion-proof motor; The safety protection module is used to continuously monitor the effect of the dual-circuit heat dissipation control module. When the safety protection condition is triggered, the explosion-proof motor stops and the emergency heat dissipation protection is activated.

2. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 1, characterized in that: The monitoring points of the explosion-proof motor include stator winding temperature monitoring points, bearing temperature monitoring points and casing temperature monitoring points, wherein, The stator winding temperature monitoring point is equipped with a three-wire PT100 platinum resistance sensor and a thermocouple sensor; The bearing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermocouple sensor; The casing temperature monitoring point is equipped with a PT100 platinum resistance sensor and a thermistor sensor.

3. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 2, characterized in that: The logic of the temperature trend prediction is: ； ； in, Indicates the i-th monitoring point The predicted temperature value at the time, i represents the monitoring point index, i=1 represents the stator winding, i=2 represents the bearing, i=3 represents the casing, Indicates the current moment, represents the prediction time step, represents the fusion temperature of the i-th monitoring point at the current moment, represents the fusion temperature of the i-th monitoring point at the historical moment, represents the historical time window, represents the multi-point consistency weight coefficient of the i-th monitoring point, represents the basic weight of the i-th monitoring point, represents the consistency influence coefficient, represents the standard deviation of the temperature at the i-th monitoring point, Indicates the upper limit of the standard deviation of the temperature at the i-th monitoring point.

4. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 3, characterized in that: The event division module includes a monitoring point event division unit and a comprehensive level control unit, wherein: A monitoring point event classification unit is used to classify the monitoring point according to its fusion temperature and predicted temperature 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 based on the event level of each monitoring point by adopting the highest level priority strategy.

5. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 4, characterized in that: The specific steps of the monitoring point event division unit include: Obtain the current fusion temperature, predicted temperature and fusion temperature change rate of each monitoring point in real time; The temperature level threshold and fusion temperature change threshold are set according to the thermal characteristics difference of the explosion-proof motor monitoring points. The current fusion temperature is divided according to the temperature level threshold of each monitoring point to obtain the temperature level of each monitoring point. The event level is divided according to the temperature level, predicted temperature, fused temperature change rate and fused temperature change threshold of each monitoring point to obtain the event level of each monitoring point; the event level includes normal monitoring events, early warning control events, alarm control events and critical protection events.

6. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 5, characterized in that: The event levels of the monitoring points are: ； ； ； in, represents the event level of the stator winding, Indicates the event level of the bearing, Indicates the event level of the chassis, Indicates normal monitoring events, Indicates early warning control events, Indicates alarm control events, Indicates a critical protection event, represents the fusion temperature of the stator winding, represents the predicted temperature of the stator winding, represents the predicted temperature of the stator winding, represents the predicted temperature of the bearing, represents the predicted temperature of the bearing, Indicates the predicted temperature of the chassis.

7. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 2, characterized in that: The explosion-proof motor includes a main heat dissipation circuit and an auxiliary heat dissipation circuit, wherein: The main cooling circuit includes a main coolant circulation pump, a main flow regulating valve, a main temperature regulator, and a main radiator dedicated to heat dissipation of the stator winding. The coolant flow rate of the main cooling circuit is adjusted by controlling the speed of the main coolant circulation pump and the opening of the main flow regulating valve, and the coolant supply temperature of the main cooling circuit is adjusted by controlling the main temperature regulator. The auxiliary heat dissipation circuit includes an auxiliary coolant circulation pump, an auxiliary flow regulating valve, an auxiliary temperature regulator and an auxiliary radiator dedicated to bearing housing heat dissipation. The auxiliary heat dissipation circuit coolant flow is adjusted by controlling the speed of the auxiliary coolant circulation pump and the opening of the auxiliary flow regulating valve, and the auxiliary heat dissipation circuit coolant supply temperature is adjusted by controlling the auxiliary temperature regulator.

8. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 7, characterized in that: The dual-circuit heat dissipation control module includes a heat dissipation mode determination unit, a main heat dissipation circuit control unit and an auxiliary heat dissipation circuit control unit, wherein: A heat dissipation mode determination unit, configured to determine the current working state of the heat dissipation circuit according to the event level of each monitoring point; The main cooling circuit control unit is used to dynamically adjust the flow rate and coolant supply temperature of the main cooling circuit according to the current working status of the cooling circuit; The auxiliary heat dissipation circuit control unit is used to control the heat dissipation of the auxiliary heat dissipation circuit in the dual-circuit collaborative mode.

9. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 8, characterized in that: The heat dissipation circuit working states include single circuit mode, main heat dissipation circuit enhancement mode, dual circuit collaborative mode and emergency heat dissipation mode, wherein, Single circuit mode is used to set the flow rate of the main cooling circuit to 80% of the rated flow rate value, and the auxiliary cooling circuit control unit puts the auxiliary cooling circuit in standby mode; The main cooling circuit enhancement mode is used for the main cooling circuit control unit to increase the main cooling circuit flow rate to 120% to 150% of the rated flow rate value, while reducing the coolant supply temperature, and the auxiliary cooling circuit control unit keeps the auxiliary cooling circuit in the standby state; Dual-circuit collaborative mode, for the main cooling circuit control unit and the auxiliary cooling circuit control unit to work simultaneously; Emergency cooling mode is used to adjust the flow rate of the main cooling circuit to the maximum design value, the flow rate of the auxiliary cooling circuit to the maximum design value, and the coolant supply temperature to the lowest controllable temperature, and at the same time send an emergency protection trigger signal to the safety protection module.

10. The intelligent explosion-proof motor system based on multi-modal temperature sensing and dual-circuit heat dissipation according to claim 1, characterized in that: The specific steps of the security protection module include: Set the temperature deviation threshold; The temperature deviation of the current monitoring point is obtained based on the current fusion temperature and the predicted temperature of each monitoring point. According to the temperature deviation of the current monitoring point and the temperature deviation threshold, when the temperature deviations of three consecutive monitoring points are 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; When the heat dissipation control effect is poor and lasts for more than three minutes, the explosion-proof motor adopts the first-level safety protection measure. The dual-circuit heat dissipation control module switches to the maximum heat dissipation capacity mode, starts the air cooling device as a backup heat dissipation device, and limits the output power of the explosion-proof motor to 90% of the rated power to enhance the heat dissipation capacity and reduce the heat load. When the first-level safety protection measures are implemented, the fusion temperature of each monitoring point rises, and the second-level safety protection measures are adopted for the explosion-proof motor, all available heat dissipation devices of the explosion-proof motor are activated, and the output power of the explosion-proof motor is limited to 70% of the rated power; When the secondary protection measures are implemented, if the current fusion temperature of any monitoring point exceeds the temperature safety threshold, the third-level safety protection measures will be adopted for the explosion-proof motor, the power supply of the explosion-proof motor will be cut off, and at the same time, each monitoring point will be forced to dissipate heat and trigger a fault alarm.

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