8results about How to "Suppresses temperature fluctuations" patented technology

This invention discloses a testing device for sensitive components of a linear temperature-sensitive fire detector, belonging to the field of fire detector testing technology. It includes a housing, a heating system, a temperature control system, and a heat dissipation system. The heating system employs a surface-mount heat conduction heating cavity and a matching heating device. The temperature control system is based on a PLC industrial control integrated computer. This invention designs standardized testing methods for both constant-temperature and differential-temperature alarm-type sensitive components. During the heating process, online thermal characteristic identification and predictive temperature control algorithms achieve precise regulation of the temperature rise rate. During the constant-temperature process, a Smith predictor combined with an adaptive PI algorithm achieves stable temperature control. Multiple safety protection functions are also included. This invention solves the problems of low temperature control accuracy, non-standardized testing procedures, inability to realistically simulate the temperature rise process, low testing efficiency, and potential safety hazards in existing testing methods. The testing process closely matches the actual working environment of the component, and the results meet standard testing requirements.

The invention discloses a muffle furnace automatic sample feeding and discharging device and method for bituminous coal caking index determination, and relates to the technical field of muffle furnaces, and the muffle furnace automatic sample feeding and discharging device specifically comprises a bearing base body, a control module, a muffle furnace, a transferring unit, a temporary storage unit, a sample feeding and discharging execution unit and a cooling unit, during operation, the temperature needs to be increased to 850 + / -5 DEG C through initialization, heat preservation is carried out, the sample is conveyed to the execution unit through the conveying unit, the sample is precisely conveyed into the furnace through the execution unit for dry distillation, automatic sampling is carried out after dry distillation, natural air cooling is carried out firstly, then forced cooling is carried out, and circulation operation is carried out. The temperature fluctuation in the furnace can be controlled within a qualified range, the potential safety hazard of manual high-temperature operation is avoided, the accuracy and repeatability of detection data are guaranteed, and the large-scale detection efficiency is greatly improved.

This invention discloses a method and system for low-temperature control of acid rain samples based on active temperature control and semiconductor refrigeration, belonging to the field of acid rain sample low-temperature control technology. The method includes the following steps: sample pretreatment and temperature control triggering, dynamic adjustment of PID control quantity and mapping of PWM signal, semiconductor refrigeration mode driving and execution, and feedback parameter updating and closed-loop control cycle. This invention pretreatment and packaging of acid rain samples into standard samples, collecting temperature data to determine whether temperature control is needed; during temperature control, according to a preset cycle, the PID control quantity is adjusted based on the temperature deviation and mapped to a PWM signal to drive the semiconductor refrigeration module to execute the corresponding mode, collecting and updating the temperature and updating the feedback variables, forming a negative feedback temperature control loop through cyclic execution. This improves the reliability of low-temperature control of acid rain samples and solves the problem of low reliability in existing technologies.

The utility model relates to the technical field of lithium batteries, and discloses a lithium battery multi-mode thermal mass characteristic synchronous detection device which comprises a split type double-cavity structure, an upper layer infrared detection cavity, a lower layer isothermal calorimetric cavity, a middle aerogel thermal insulation layer and an FPGA (Field Programmable Gate Array) control panel, a thermal infrared imager and a battery to be detected are arranged in the upper layer infrared detection cavity, and a lower layer isothermal calorimetric cavity is arranged in the lower layer isothermal calorimetric cavity. A thermopile array and an electromagnetic force weighing sensor are arranged in the lower-layer isothermal calorimetric cavity and used for obtaining heat production power and mass change, transverse heat flow is blocked by the aerogel heat insulation layer, millisecond-level synchronous triggering is achieved by the FPGA control panel, and the upper-layer cavity and the lower-layer cavity are connected through a low-heat-conduction ceramic column. The device solves the problems of thermal-mechanical coupling interference and multi-modal data loss of traditional detection equipment, and provides high-precision multi-physical field coupling data support for lithium battery thermal runaway early warning and health state evaluation.

This invention discloses a method, equipment, and storage medium for feedforward control of air conditioning in a large terminal building. The method includes: acquiring architectural layout and electromechanical system drawings of the terminal building; dividing the large terminal building space into several virtual control areas; and establishing a mapping relationship database between each control area and the corresponding flight boarding gate, air conditioning unit, terminal air outlet, and sensor; reading the flight dynamic information flow from the mapping relationship database in real time and extracting key fields; dynamically calculating the pre-cooling start-up advance and dissipation delay based on the key fields, and defining four control stages for each flight's support cycle accordingly; issuing corresponding control commands to the frequency converter and water valve actuator based on the four control stages; and achieving digital transformation of airport facility operation and maintenance through joint control of each stage and in conjunction with the key fields of the flight, combining flight flow with energy flow, realizing on-demand energy supply, and improving the overall operation and management level of the airport.

The application discloses an active thermal management method for a motor driver of an aircraft. The method adopts temperature-sensitive electrical parameters to construct a thermal network and comprehensively considers measured temperature of a temperature sensor, and performs active thermal management control from three aspects of driving parameter, modulation strategy and working cycle to inhibit overall temperature fluctuation of the driver, balance temperature of the same bridge arm and balance temperature of the same phase and different bridge arms. The application has the beneficial effects that: the working state of the driving device is actively and overall adjusted, the temperature of the aircraft driving unit is balanced and stabilized, and the operation and maintenance cost of the driver is reduced; the real-time and accuracy of temperature collection are considered, the method has strong practicability and wide application prospect; and the method has unique advantages in the fields of inhibiting temperature fluctuation of the power device and prolonging the service life of the driver.

The application discloses a low-temperature temperature sensor calibration system and method, and relates to the technical field of sensor calibration.The system comprises a vacuum cavity, a first-stage cold shield and a second-stage cold shield arranged inside the vacuum cavity from outside to inside, and a refrigerator.The calibration device is arranged in the second-stage cold shield and comprises a first-stage structure and a second-stage structure.The first-stage structure comprises a second-stage cold disc, a thermal resistance assembly and a third-stage cold disc from top to bottom, the second-stage cold disc is connected with a second-stage cold head, and the third-stage cold disc is provided with an electrical connector.The second-stage structure comprises a calibration cold disc and a heat-conducting column connected between the third-stage cold disc and the calibration cold disc, and the calibration cold disc is provided with a low-temperature temperature sensor.The system performs staged cooling on the inside of the vacuum cavity through the first-stage cold head and the second-stage cold head, attenuates and filters temperature fluctuations of the second-stage cold head transmitted to the third-stage cold disc through the thermal resistance assembly, and collects a sensor resistance value signal after the temperature of the calibration cold disc is controlled to a set temperature point through a heater.The system and method have high temperature stability and high operation efficiency, and can improve calibration precision and work efficiency.

The utility model relates to the technical field of gas detection devices, and discloses a thermostat for gas detection, which comprises a frame, a collecting bin and a gas pump are fixed in the frame, the top end of the collecting bin is communicated with the gas pump through an inlet pipe and an outlet pipe, and the input end of the gas pump is communicated with a gas inlet and a gas outlet. A temperature sensing assembly is fixed to the gas inlet, the bottom end of the collecting bin is communicated with the medium inlet and the medium outlet, an air source heat pump is fixedly inserted into the medium inlet, and the medium inlet and outlet and the gas inlet and outlet device are matched with the air source heat pump, so that the temperature can be quickly adjusted; a heating or refrigerating function can be quickly started, the temperature in the incubator can quickly reach a set value through quick circulation of a medium, the temperature sensing assembly performs real-time monitoring and feedback, temperature fluctuation is effectively restrained, the temperature in the incubator is kept stable for a long time, a continuous and stable environment is provided for gas detection, and the detection efficiency and the equipment operation stability are improved.