49results about How to "Avoid thermal failure" patented technology

The invention provides an electromagnetic and friction integrated brake system and a control method thereof. The electromagnetic and friction integrated brake system comprises a friction brake, an electromagnetic brake, a permanent magnet generator, a vehicle-mounted battery and an integrated controller. The inside friction disk and the outside friction disk of the disk-type friction brake are manufactured separately and connected by use of a bolt. The electromagnetic brake is of a rotary drum type and composed of an electromagnetic brake stator and a rotor for generating electrical vortex; the electromagnetic brake stator is located between the inside friction disk and the outside friction disk and fixedly connected with a steering joint support or suspension. The permanent magnet generator is located between the electromagnetic brake and the outside friction disk, and comprises a permanent magnet and a generator stator; the generator stator is connected with the electromagnetic brake stator by use of a bolt. The electromagnetic and friction integrated brake system has the advantages that the frequency of use of the friction brake is reduced, the heat of the brake system is scattered, the stability of the braking efficiency of the vehicle is improved, partial braking energy is recovered, and the braking noise is reduced and the consumption of energy of the whole vehicle during running is also reduced.

The invention discloses electric insulation electric-heating aging test equipment, which comprises non-vignetting high-voltage testing transformer and at least one test box, wherein the box body of the test box is adiabatic; the inside of the test box is provided with a heating device; the top of the test box is provided with at least one high-voltage electrode connected with the high-voltage output end of the non-vignetting high-voltage testing transformer, while the lower part is provided with at least one detection terminal; and the high-voltage electrode and the detection terminal are respectively insulated from the box body of the test box. The electric insulation electric-heating aging test equipment can effectively simulate the electrical and thermal stress on electric equipment during operation, and carries out experiment on a plurality of test samples under different temperatures, voltage types and voltage grades; moreover, the test equipment obtains the data of current waveform and local discharging signal during the aging process of test samples.

A composite VDMOS device possessing a temperature sampling and over-temperature protection function belongs to the power semiconductor device field. In the invention, a VDMOS device, a polysilicon thermal diode and an over-temperature protection circuit are integrated. Through using a negative temperature characteristic of forward voltage drop of the polysilicon thermal diode, the polysilicon thermal diode is made on an insulating layer of a VDMOS device surface so as to realize sampling of a VDMOS device operating temperature. Based on a temperature sampling signal of the polysilicon thermal diode, the over-temperature protection circuit carries out partial pressure to a gate input voltage Vin of the whole composite VDMOS device so as to obtain a gate control voltage VG of the VDMOS device. Therefore, the over-temperature protection can be performed to the VDMOS device, which is characterized by: when the operating temperature of the VDMOS device reaches TH, turning off the VDMOS device; when the internal temperature drops to TL after the VDMOS device is turned off, starting the VDMOS device, wherein temperature return difference can be represented as a following formula: Delta T=TH-TL. By using the composite VDMOS device of the invention, the accurate sampling and the over-temperature protection can be performed to the VDMOS device so that thermal failure of the device can be avoided and a service life of the device can be prolonged. A structure is simple and sampling accuracy is high. The device is compatible with a VDMOS device technology. The device is monolithic and has many other advantages.

The invention discloses an electrical insulation electric heating aging test device under composite voltage, which comprises two corona-free high-voltage test transformers and at least one test box, wherein a box body of the test box insulates heat; the test box is internally provided with a heating device; at least one high-voltage electrode which is connected with high-voltage output ends of the corona-free high-voltage test transformers is introduced to the top of the test box; the lower part of the test box is provided with at least one detection terminal; and the high-voltage electrodes and the detection terminals are respectively insulated with the box body of the test box. The electrical insulation electric heating aging test device under composite voltage provided by the invention can effectively simulate the composite electricity and heat stress borne by an electrical device in operation, also can test sample products under different temperatures, voltage types and voltage grades at the same time, and can obtain the breakdown voltage and breakdown time of the sample products in the aging process.

The invention relates to a high-concentration allantoin homogeneity premix body series product. The high-concentration allantoin homogeneity premix body series product is characterized by consisting of the following components: allantoin, glycerol, sorbitol, propylene glycol, polyglycerol, lauric acid single polyglycerol ester, sodium lauric acid polyglycerol ester single succinic acid ester, squalane, isononyl isononanoate, polydimethylsiloxane DC-200, tridecanol trimellitate (TDTM) olive oil, wheat germ oil and colorless jojoba oil. Easy-flow products are prepared at high efficiency by a medium-and-low-temperature method by using conventional homogeneous equipment. The high-concentration allantoin homogeneity premix body series product can be used for overcoming the defects of the prior art and the invention provides a high-concentration allantoin homogeneity premix body which can be easily dispersed, is good in stability and has no preservatives. The high-concentration allantoin homogeneity premix body series product is convenient to add, is suitable for environment-friendly normal-temperature energy-saving modulation process of paste and emulsion, and lays a foundation for pure natural greening of medicinal and skin-care products.

The invention relates to a display screen controller fan speed regulation method and device and a machine readable storage medium. The display screen controller fan speed regulation method comprises the following steps that a working environment temperature and a working chip temperature are acquired, a fan speed value FanA is determined by using a working environment temperature conversion curve,a fan speed value FanB is determined by using a working chip temperature conversion curve, the fan speed value is determined through comparison of the difference between the fan speed value FanA andthe fan speed value Fanb with a fan adjusting gear value Fandmax / 10, and the speed is regulated and the fan speed value is stored. A display screen controller is subjected to zoning, and is used for acquiring and calculating data of the working environment temperature and the working chip temperature, the speed regulation is controlled, the use efficiency of a fan is improved, the heat dissipationeffect is improved, the service life of various equipment in the controller is prolonged, the energy is saved, and the noise and raised dust of the fan are reduced.

A heating apparatus includes an inverter power supply for driving the high frequency generating device, a holding member for holding the inverter power supply and cooling fan for cooling down the inverter power supply. The holding member is provided with a holding portion for holding the inverter power supply and an air guide portion for guiding cooling air from the cooling fan toward the inverter power supply, and the air guide portion covers the inverter power supply and guides the cooling air in a manner that a semiconductor switching device and a high voltage transformer of the inverter power supply are primarily cooled down.

The invention discloses a power-driven four-wheeler controller, comprising a bottom board, a heat dissipating shell, a sealing gasket, a plastic cover cap, bolts, threaded supporting columns I. threaded supporting columns II, a functional plug, a master cable binding post, a capacitor and power tubes, wherein the middle of the power-driven four-wheeler controller is provided with the hollow heat dissipating shell; the bottom board is a thick aluminum plate; the plastic cover cap is arranged at the top of the power-driven four-wheeler controller; a PCB plate I, a PCB plate II and an aluminum substrate are installed in the hollow heat dissipating shell. The 48 power tubes and 10 threaded supporting columns II are welded on the aluminum substrate tightly; the threaded supporting columns II are used to lock the aluminum substrate on the bottom board and are connected with the PCB II simultaneously; one sealing gasket is arranged between the functional plug and the plastic cover cap. The controller of the invention improves assembling efficiency and removes a hidden danger that the power tubes are burned because of heat concentration. The power-driven four-wheeler controller avoids the condition that the impedance is increased because of insufficient solder and function of the controller is lost because of high heat.

The invention provides a cooling fan speed setting method suitable for temperature closed-loop regulation of a power electronic device, which comprises the following steps of: firstly, primarily calculating the wind speed from the temperature of the power electronic device to obtain a reference wind speed, and then calculating the minimum safety rotating speed set by the wind speed of a cooling fan from the angles of heat productivity and environment temperature; then verifying the reference wind speed by using the safe rotating speed to prevent the reference wind speed from being lower than the safe rotating speed due to power electronic temperature sampling deviation. Meanwhile, when the temperature of the power electronic device is accurately sampled, the reference wind speed is given as the effective wind speed, so that the purpose of controlling the temperature of the power electronic device is achieved. The reliability of the power electronic heat dissipation system can be effectively improved, and the problem of heat dissipation failure caused by failure of a single sensor is prevented.

The invention relates to the field of compression equipment and discloses an air suction pipe set, a compressor and a mounting method of the air suction pipe set of the compressor. The air suction pipe set is used for connecting a liquid storage device of the compressor with a compression unit located in a main shell of the compressor. The air suction pipe set comprises a connecting pipe and a heat insulating pipe. The connecting pipe comprises a first pipe section used for being connected with the liquid storage device and a second pipe section used for being connected with the main shell ina welded mode. The heat insulating pipe communicates with the compression unit, at least part of the heat insulating pipe is sleeved with the connecting pipe, the heat insulating pipe is in contact connection with the inner wall face of the first pipe section, and the heat insulating pipe and the second pipe section are arranged in a spaced mode in the radial direction. The heat insulating pipe isin contact connection with the inner wall face of the first pipe section, and the heat insulating pipe and the second pipe section are arranged in the spaced mode in the radial direction so as to form a heat insulating chamber, so that heat transmitted to the heat insulating pipe is reduced, and the heat insulating effect is ideal; and meanwhile, the number of parts included in the air suction pipe set is small, the structure is simple, the number of weld joints is small, thus the risk of airtightness leakage is reduced, and the using property of the air suction pipe set is improved advantageously.

The invention discloses an active air cooling and phase change cooling composite battery thermal management system and a working method thereof. The system is composed of a thermal management system box body, a battery pack, phase change cooling devices, a supporting column, a supporting plate, cooling air inlets, cooling air outlets and an electric push rod, wherein two groups of cooling phase change devices which are stacked up and down are arranged, the phase change devices are matched with the battery pack, two groups of air inlets and air outlets are formed, when one group of phase changecooling devices works, the other group of phase change cooling devices and the corresponding air inlets and air outlets form a cooling system of the phase change devices, a phase change material is cooled and solidified through forced air cooling; when the working phase change devices fail in heat, the phase change devices in the cooling system are transmitted to form a new working system together with the battery through the electric push rod, at the moment, the phase change cooling devices failing in heat, the other air inlet and the other air outlet form a new cooling system. The system isadvantaged in that the temperature control effect of the phase change temperature control device in the system is remarkably improved, and the defect that the phase change device cannot continue to work after heat charging fails is effectively overcome.

A high frequency heating apparatus of the present invention includes an inverter power supply for driving the high frequency generating device, a holding member for holding the inverter power supply and cooling fan for cooling down the inverter power supply. The holding member is provided with a holding portion for holding the inverter power supply and an air guide portion for guiding cooling air from the cooling fan toward the inverter power supply, and the air guide portion covers the inverter power supply and guides the cooling air in a manner that a semiconductor switching device and a high voltage transformer of the inverter power supply are primarily cooled down.

The invention provides a soaking trench gate IGBT (Insulated Gate Bipolar Translator) structure. The soaking trench gate IGBT structure comprises an effective IGBT cell and a gate thermosensitive control unit, the effective IGBT cells are arranged to be trench gate type IGBT cells; the grid thermosensitive control unit comprises two thermistors and two diodes; wherein one thermistor and one diode are connected in series to form a first series branch for controlling the opening speed of the gate, one end of the first series branch is connected with the trench gate, and the other end is connected with the gate metal; wherein the other thermistor and the other diode are reversely connected in series to form a second series branch for controlling the gate turn-off speed, one end of the second series branch is connected with the trench gate, and the other end of the second series branch is connected with the gate metal. According to the invention, through the trench gate and the thermosensitive gate resistor which are independently arranged, the switching speed of a single cell is automatically adjusted according to the temperature of the cell, so that the loss of the cell with high temperature is reduced, and the purpose of reducing the junction temperature of the cell is achieved. And for the whole IGBT chip, heat balance is realized.

The invention discloses a control method and device of a hybrid switch device, equipment and a medium, and relates to the field of power electronics. The method comprises the steps of determining thatthe hybrid switch device enters a power transmission mode; in the switch conduction stage, under the condition that the first mechanical switch unit is in an off state, controlling the second mechanical switch unit and the semiconductor switch unit to be conducted in sequence; in the power transmission stage, controlling the first mechanical switch unit to be in an on state, and controlling the semiconductor switch unit to be in an off state; and in the switch off stage, under the condition that the first mechanical switch unit is in an off state, controlling the semiconductor switch unit andthe second mechanical switch unit to be off in sequence. According to the hybrid switch device control method and device, the equipment and the medium provided by the embodiment of the invention, thesafety of the switch device can be improved.

The invention discloses a wear-resistant liquid metal polymer self-lubricating composite material. The composite material comprises polyether-ether-ketone and liquid metal. In the friction process, the liquid metal absorbs friction heat and is changed into liquid through phase change, and a transfer film is formed between a polymer matrix and a friction pair. In the friction process of the material, friction heat can be taken away in time due to phase change heat absorption, and a stable liquid metal transfer film can be formed when the internal liquid metal lubricating grease is extruded by a load and is exposed out of a contact surface, so that direct contact of a friction surface is blocked, the friction coefficient of the composite material is effectively reduced, and the wear resistance of the material is improved. The material can be applied to sealing elements under high-temperature, high-pressure and high-speed working conditions.

The invention discloses an electric vehicle controller structure with integrated plugs. The electric vehicle controller structure comprises a protection cover, a sealing plug, a radiating shell, baffles, a PCB I, a PCB II, an insulating pad, a pressing strip, a back cover plate, sealing pads, screws, the integrated plugs, a single-plastic high contact pin and a dual-plastic high contact pin, wherein the radiating shell adopts an opening type; a flat bottom plate made from iron is arranged at the bottom; the two baffles which are made from iron and are equipped with mounting holes are arranged at the two ends of the radiating shell; the PCB I and the PCB II are arranged in the interior; the electric vehicle controller structure is characterized in that strip-shaped radiating teeth are distributed at the two ends of the top part of the radiating shell; eight threaded holes are formed in each of the left and right ends of the radiating shell respectively; eight threaded holes are formed in each of the front and back ends of the radiating shell respectively; 18 power tubes are welded on the circuit board I; and after the pins are bent, the power tubes are uniformly arranged on the two sides of the PCB I in two rows. The electric vehicle controller structure has the advantages as follows: the controller structure is convenient to assemble and capable of lowering the cost and greatly improving the assembling efficiency; and excessive concentration of heat in the power tube region is avoided, so that the potential safety hazard of overheat burn out of the power tubes caused by the excessive concentration of heat is eliminated.

Disclosed by the present invention is a target pipeline dynamic thermal failure analysis method in a parallel pipeline jet fire scenario, including the following steps: 1, inputting operation parameters of source pipeline to obtain instantaneous thermal radiation value received by target pipeline in instantaneous jet fire near field; 2, establishing fitting function relational expression of the instantaneous thermal radiation value and time change; 3, calculating instantaneous temperature distribution result of the pipe wall of the target pipeline; 4, calculating convective heat transfer coefficient of inner wall of the target pipeline; 5, calculating instantaneous thermal stress and total instantaneous stress borne by the pipe wall of the target pipeline in a circumferential direction, radial direction and axial direction; 6, carrying out testing to obtain yield strength and ultimate tensile strength corresponding to different temperatures; and 7, analyzing and judging target pipeline dynamic failure result.

A freeze-dried powder low-temperature smashing mechanism comprises a smashing bin body, a smashing mechanism body, a material returning mechanism, a screening mechanism and a dry ice cooling pool. The smashing mechanism body comprises a first driving motor, a second driving motor, a first driving shaft, a second driving shaft, a first smashing blade and a second smashing blade, and the first driving motor is fixedly connected to the top of the smashing bin body; and the first driving shaft is arranged in the smashing bin body in a penetrating manner, the first smashing blade is connected to the first driving shaft, the second driving motor is fixedly connected to the top of the smashing bin body, and the second driving shaft is arranged in the smashing bin body in a penetrating manner. According to the freeze-dried powder low-temperature smashing mechanism, freeze-dried powder is smashed for multiple times by adopting the two groups of smashing blades of the double smashing mechanism, so that the smashing effect is improved, the smashed freeze-dried powder is continuously screened through the screening mechanism, the screened freeze-dried powder reaching the standard is directly discharged, and the unqualified screened freeze-dried powder is discharged into a material returning pipeline through a material returning opening and is conveyed into a coming material discharging pipeline through a rotating shaft connected with a spiral blade to be secondarily added and smashed again until the freeze-dried powder reaches the standard.

The invention relates to a motor-based control circuit, an electric hair dryer and a physiotherapeutic apparatus. The motor-based control circuit comprises a motor unit, a first switch unit, a heatingunit and a second switch unit. The motor unit includes a motor. The switch unit includes a first switch and a second switch. When receiving a motor operation control signal transmitted by a motor control line and a low-voltage signal output by the first switch, the motor is started and outputs a switch control signal to the control end of the second switch unit. The second switch unit switches onthe input end of the second switch unit and the output end of the second switch unit according to the switch control signal. The heating unit is started and generates heat when the input end and output end of the second switch unit are switched on and when heating unit receives a high-voltage signal output by the second switch. The heating unit activates the heating function only after the motoris started. Therefore, the motor-based control circuit avoids thermal failure and safety accidents caused by the lack of an air cooling system.

The present invention relates to the technical field of fuel cells, and particularly discloses a collector plate, the collector plate comprises a collector plate body, a first coating layer and a second coating layer, the first coating layer and the second coating layer respectively coat the outer surface of a first connection area and the outer surface of a second connection area of the collector plate body, the first coating layer is provided with a first cooling cavity, and the second coating layer is provided with a second cooling cavity. The first coating layer is provided with a first cooling cavity, the second coating layer is provided with a second cooling cavity, the first cooling cavity is communicated with the second cooling cavity through a flow channel, the first liquid inlet and outlet is communicated with the first cooling cavity, the second liquid inlet and outlet is communicated with the second cooling cavity, and cooling liquid enters the first cooling cavity through the first liquid inlet and outlet and then enters the second cooling cavity through the flow channel. Finally, the cooling liquid in the second cooling cavity flows into the second liquid inlet and outlet. The first cooling cavity and the second cooling cavity are respectively used for cooling the first connecting area and the second connecting area, and the reaction area is directly exposed in the air. The collector plate can take away heat generated by the collector plate in time, and thermal failure of the collector plate is prevented.

The invention discloses a DC transient surge voltage suppression module, which comprises a voltage acquisition and comparison circuit, a power execution device and a driving circuit, and is characterized in that the voltage acquisition and comparison circuit is used for acquiring a current loop voltage, comparing the current loop voltage with a preset voltage threshold value and outputting a control signal according to a comparison result, the power execution device is used for outputting current to a load, and the driving circuit drives the power execution device according to the control signal output by the voltage acquisition and comparison circuit, so that the power execution device is in a complete conduction state or a variable resistance area state. According to the invention, the suppression module detects the current loop voltage through the voltage acquisition and comparison circuit, compares the current loop voltage with a preset voltage threshold value, and then outputs a control signal to control the working state of the power execution device through the driving circuit, so that the output voltage value is within the specified input range of the post-stage electric equipment.

The invention discloses a medicinal material screening vibration motor. The vibration motor is to generate a lot of heat in a working process. First, when the vibration motor does not work, a fine gapexists between a shaft and a bearing. With continuous rise of temperature, the shaft is heated to expand, and the gap therebetween becomes smaller and smaller, so that the force of friction is increased and the temperature is raised quickly. When a rated temperature is reached, relatively large damage is posed to the integral vibration motor. Second, when the temperature reaches the rated temperature, use of inner lines is affected, so that a certain electric leakage risk exists. The temperature of the surface of a rotor becomes higher and higher, so that transferred heat is conveyed to a temperature sensing module through a heat conducting wire in contact with a movable block slowly, and the temperature sensing module makes a signal response. If the temperature exceeds the rated temperature, the temperature sensor module enables a telescopic rod to extrude toward the surface of the rotor to drive a brake to brake the rotor so as to force the integral vibration motor to stop working,so that a condition that inner parts and circuits are damaged due to overtemperature is avoided.

The invention relates to a motor-based control circuit, an electric hair dryer and a physiotherapeutic apparatus. The motor-based control circuit comprises a motor unit, a first switch unit, a heatingunit and a second switch unit. The motor unit includes a motor. The switch unit includes a first switch and a second switch. When receiving a motor operation control signal transmitted by a motor control line and a low-voltage signal output by the first switch, the motor is started and outputs a switch control signal to the control end of the second switch unit. The second switch unit switches onthe input end of the second switch unit and the output end of the second switch unit according to the switch control signal. The heating unit is started and generates heat when the input end and output end of the second switch unit are switched on and when heating unit receives a high-voltage signal output by the second switch. The heating unit activates the heating function only after the motoris started. Therefore, the motor-based control circuit avoids thermal failure and safety accidents caused by the lack of an air cooling system.