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.

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 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.

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.

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.

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 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.