21results about How to "Solve burnt" patented technology

The invention discloses a multi-evaporator branch flow self-adaptive distribution two-phase cooling cycle and a control method thereof, the multi-evaporator branch flow self-adaptive distribution two-phase cooling cycle mainly comprises a plurality of parallel evaporators, a condenser, a liquid storage device, a liquid pump and a connecting pipeline, and a ventilation liquid blocking valve is mounted at an outlet of each branch evaporator. The ventilation liquid blocking valve is mainly composed of a valve seat, a valve element and a floating ball, the opening degree of the valve is automatically adjusted according to the dryness of an inlet working medium under the action of gravity and buoyancy, and the larger the dryness is, the larger the opening degree of the valve is. When the heat loads of the branches are not synchronous, the circulation flow can be distributed in a self-adaptive mode according to needs, the larger the heat loads on the branches are, the higher the dryness of the corresponding working media is, the smaller the resistance of the ventilation liquid blocking valve is, and the larger the flow of the branches is. The smaller the thermal load on the branch is, the smaller the dryness of the corresponding working medium is, the larger the resistance of the ventilation liquid blocking valve is, and the smaller the flow of the branch is. The problem that a high-load branch is prone to being overheated and burnt due to small flow is solved, meanwhile, invalid flow of a low-load branch can be effectively reduced, and energy consumption of a liquid pump is greatly saved.

The invention relates to a mechanical sealing structure for a shaft end of a compressor and a sealing, lubricating and cooling method. The compressor is characterized in that the compressor comprises a movable ring, a static ring and a lip-shaped sealing ring, an oil storage cavity and an oil supply ring cavity are formed in a compressor shell, the oil storage cavity and a rotor cavity are separated through a separation convex ring, and the lip-shaped sealing ring is installed between the separation convex ring and a compressor rotor; the movable ring and the static ring are both located in the oil storage cavity, the movable ring is fixed to a compressor rotor, the static ring is fixed to a compressor shell, a sealing convex ring on the movable ring abuts against a sealing plane of the static ring to form a mechanical sealing face, an inlet of the oil supply ring cavity is connected with an external high-pressure oil supply pipe, and a plurality of oil spraying openings are formed in the wall face between the oil supply ring cavity and the oil storage cavity. And the oil injection port is obliquely arranged and is aligned with the mechanical sealing surface. The sealing device is reasonable in structural design and good in sealing, lubricating and cooling effects.

The utility model discloses a cold plate switching heat dissipation device used in a thermal vacuum test, which comprises a water cooling machine and a thermal vacuum tank body, the inner cavity of the thermal vacuum tank body is fixedly connected with a thermal vacuum box body, the top of the thermal vacuum box body is fixedly connected with a cold plate, the left end of the water cooling machine is fixedly provided with a conveying pipe, and the right end of the water cooling machine is fixedly provided with a water pump. A corrugated pipe is fixedly mounted at the left end of the conveying pipe, a mounting flange is fixedly connected to the right end of the thermal vacuum tank body, and a one-way valve is fixedly mounted at the right end of the mounting flange. Compared with the prior art, the thermal vacuum box body and the thermal vacuum tank body have the advantages that internal liquid can be refrigerated through the arrangement of the water cooler, the effect of conveying water-cooled liquid into the corrugated pipe is achieved through the arrangement of the conveying pipe, the effect of refrigerating and cooling the thermal vacuum box body and the thermal vacuum tank body is achieved through the arrangement of the corrugated pipe and the cold plate, and the service life of the thermal vacuum box body and the thermal vacuum tank body is prolonged. And through the arrangement of the one-way valve and the mounting flange, the effect of turning on and turning off the liquid switch is achieved.

The invention relates to an intelligent motor overload and overvoltage absorption circuit with protection and a control method thereof, and the circuit comprises a control module, a preset protection voltage adjustment module, a voltage sampling module, a voltage comparison module, an overtime and overvoltage judgment module, and a power absorption module. A comparison signal output end of the voltage comparison module is connected with a comparison signal input end of the overtime overvoltage judgment module, a judgment signal output end of the overtime overvoltage judgment module is connected with a controlled end of the power absorption module, and a sampling signal output end of the overtime overvoltage judgment module is connected with a sampling signal input end of the control module. The overtime control signal output end of the control module is connected with the overtime control signal input end of the overtime overvoltage judgment module, and the overtime overvoltage judgment module not only can monitor the occurrence of an overload overvoltage signal, but also can judge the duration of the signal, thereby avoiding the long-time conduction of a resistor, and improving the reliability of the circuit. The problem of overheating or burnout caused by continuous conduction of a resistor in traditional hardware protection is solved.

The invention discloses a power supply control system and control method based on far-end compensation, and solves the problems that in the long-distance power supply process, when an existing compensation voltage monitoring circuit is used, a capacitor is in a short-circuit state at the moment when a capacitor X of a filter is charged, and at the moment, almost all output high voltage is loaded to an overcompensation sampling resistor; therefore, the problem that the resistor is burnt out due to overpower is solved. The overcompensation control system comprises a power conversion unit, a power control unit, a system filtering unit, an overcompensation sampling unit and a system control unit, compensation voltage is sampled through the overcompensation sampling resistor, compensation output is controlled through the overcompensation control circuit and the power control unit, the structure is simple, and the problem that the sampling compensation resistor is burnt due to overpower can be solved.

The application belongs to the technical field of lithium batteries, and particularly relates to a hybrid battery system structure, which comprises a box body, an A module, a B module, an A area explosive disposal system and a B area explosive disposal system. An isolation beam is arranged in the box body, and the isolation beam divides the internal space of the box body into an A area and a B area. The A module is arranged in the A area, and the B module is arranged in the B area. The A area explosive disposal system comprises an explosive disposal gas collection bin arranged below the A area and a longitudinal explosive disposal channel arranged on the side of the box body and in communication with the explosive disposal gas collection bin. The B area explosive disposal system is arranged above the B area and in communication with each second battery cell explosive disposal valve. The A area explosive disposal system and the B area explosive disposal system are not in communication with each other. The application realizes physical isolation, thermal isolation and electrical isolation of different chemical system battery cells, and effectively prevents a single side thermal runaway from spreading and causing a chain reaction accident.

The invention discloses a pure kelp powder extruded puffed food and a preparation method thereof, and belongs to the field of food processing. The method comprises the following steps: (1) drying kelp, crushing, and sieving to obtain kelp powder; (2) extruding and puffing the kelp raw material powder by using a twin-screw extruder, and setting the extrusion temperature of each area of the twin-screw extruder, the kelp powder feeding amount, the water inlet amount and the screw rotating speed; and (3) finally, collecting a product obtained in the step (2), and finishing and forming after the product is cooled. The kelp powder is used as the raw material, and no grease is added, so that the prepared puffed food is low in calorie, rich in various components such as dietary fibers, high in nutritional value and balanced in nutrition; through a twin-screw extrusion technology, the raw materials are puffed in a high-temperature and high-pressure state, caramelization and Maillard reaction of the materials are promoted, insoluble dietary fibers are converted into soluble dietary fibers, and the product is endowed with unique flavor and crisp taste.

The present invention belongs to the field of high-voltage protection of power systems, and discloses a circuit for suppressing circuit breaker opening, restrike and capacitor switching overvoltage and overcurrent, including an AC power supply, a circuit breaker S1, a protection circuit and a capacitor C1, wherein the protection circuit includes a switch device control module, a transformer, a variable resistor R1, a resistor R2, a resistor R3, a resistor R4, a switch device K1, a switch device K2, a switch device K3, a switch device K4, an auxiliary circuit breaker S2, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a reactor L1 and a DC power supply DC. The protection circuit proposed in the present invention can suppress the closing inrush current and closing overvoltage in the process of switching capacitors by the circuit breaker, suppress the opening overvoltage and circuit breaker reignition in the opening process, and replace the discharge coil to discharge the parallel capacitor after the opening, so as to realize the full process protection of the circuit breaker switching parallel capacitor.

The embodiment of the invention provides a capacitor and electronic equipment, relates to the technical field of capacitors, and is used for solving the problem of circuit board burnout caused by short-circuit failure of the capacitor and improving the safety of a circuit. The capacitor comprises a base body, a first electrode, a second electrode, a plurality of first polar plates and a plurality of second polar plates. The first electrode is arranged on the first side of the substrate. The second electrode is arranged on the second side of the substrate. The first side and the second side of the base body are different sides of the base body. The first polar plate is connected with the first electrode. The plurality of second polar plates and the plurality of first polar plates are alternately stacked one by one, and a first insulating layer is arranged between any adjacent first polar plate and second polar plate. The second polar plate comprises a second main body part and a second fusing part, and the second main body part is connected with the second electrode through the second fusing part. And the second fusing part is used for fusing under the condition that the first polar plate and the second polar plate are short-circuited. The capacitor is used for a circuit.

The invention discloses a control method of a PFC circuit of an air conditioner, an outdoor unit control circuit and the air conditioner, the PFC circuit comprises a first bridge arm and a second bridge arm, the first bridge arm comprises a first gallium nitride switching tube and a second gallium nitride switching tube which are connected in series, and the air conditioner comprises a load module powered by the PFC circuit. The load module comprises a compressor. The method comprises the steps that the running state of the compressor is obtained; and controlling the first gallium nitride switching tube and the second gallium nitride switching tube according to the running state so as to reduce current flowing through a fly-wheel diode of the first gallium nitride switching tube and a fly-wheel diode of the second gallium nitride switching tube in the starting process of the compressor. A large current is prevented from flowing through a fly-wheel diode of the gallium nitride switch tube for a long time, so that the risk of burning of the gallium nitride switch tube is reduced, and the problem of burning of the gallium nitride switch tube is solved.

The invention belongs to the field of high-voltage protection of a power system, and discloses a circuit breaker opening reignition and capacitor switching overvoltage and overcurrent suppression circuit, which comprises an alternating current power supply, a circuit breaker S1, a protection circuit and a capacitor C1, the protection circuit comprises a switching device control module, a transformer, a variable resistor R1, a resistor R2, a resistor R3, a resistor R4, a switching device K1, a switching device K2, a switching device K3, a switching device K4, an auxiliary circuit breaker S2, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, an electric reactor L1 and a direct-current power supply DC. The protection circuit provided by the invention can restrain closing inrush current and closing overvoltage in the process of switching the capacitor by the circuit breaker, restrain opening overvoltage and reignition of the circuit breaker in the opening process, and replace a discharge coil to discharge the parallel capacitor after opening, so that the protection of the whole process of switching the parallel capacitor by the circuit breaker is realized.

The utility model discloses a surge suppression circuit, which comprises a switch module connected with a power supply, and the output end of the switch module is connected with a post-stage load; the access control module is connected to a power supply and the switch module; the overvoltage protection module is connected with the power supply and the access control module; the overvoltage protection module is configured to control the working state of the switch module by controlling the working state of the access control module, and when the working voltage of the power supply does not exceed a preset value, the access control module is kept working, so that the switch module works normally; and when the working voltage of the power supply exceeds a preset value, the output of the switch module is closed by closing the output of the access control module. According to the circuit, the risk that post-stage equipment including circuit components are damaged by long-time voltage surge in a low-internal-resistance scene of the power supply is reduced, and meanwhile, the problem that a surge suppression circuit or a post-stage circuit is burnt out due to reverse polarity connection of the power supply is solved.

The invention relates to the technical field of robot power supplies, in particular to an intelligent power supply management method of an agricultural robot, which comprises the following steps: pressing a switch to enable an intelligent power supply controller to perform self-inspection and then power on; judging the current working condition of the robot according to the agricultural robot load state; and the equipment is powered off based on the current working condition. According to the control method, a low-voltage power supply and a high-voltage power supply of the agricultural robot are controlled according to a time sequence, and an insulation condition, high-voltage interlocking, voltage, current and state feedback are combined, so that the whole process forms closed-loop control, each component can be ensured to be quickly and accurately electrified and enter a working state, and also can be safely and accurately electrified and enter a low-power-consumption state; high voltage is cut off in time under the extreme working condition, safety of all high-voltage components is guaranteed as much as possible, the lack of power management of the new energy agricultural robot is made up through the process, and therefore the problem that components are burnt out easily due to disordered power management of an existing new energy agricultural robot is solved.

The utility model discloses a monitoring circuit for preventing star-delta step-down starting from being changed into full-voltage starting. The monitoring circuit comprises a first control circuit, a second control circuit, a third control circuit, a fourth control circuit, a fifth control circuit, a sixth control circuit and a seventh control circuit, the device has the advantages that by utilizing the linkage between a plurality of auxiliary contacts on a power supply contactor KM1, a star contactor KM3 and a plurality of layers of contacts of a stop button SB1, a star start button SB2 and an angle start button SB3 and under the matching of the monitoring effects of a first indicator lamp, a second indicator lamp, a third indicator lamp and a fourth indicator lamp, the device is lighted up in a strict sequence; when one lamp is not turned on, an operator can discover problems in time, does not carry out the next operation, is strict in logic and does not jump, so that the problem of motor burnout caused by adhesion of contacts of a contactor at present is solved, the problems are discovered and solved in time, economic loss is reduced, and smooth production is ensured.

The invention discloses an electric heating aging test device and method for a high-voltage AC / DC cable and accessories thereof. The device comprises a power electronic transformer, an MMC main controller, a DAB main controller, a sampling plate, a protective resistor, a feed-through transformer and a cable accessory aging sample assembly. The power electronic transformer comprises a high-voltage alternating current port, a low-voltage alternating current port, a high-voltage direct current port and a low-voltage direct current port; the power electronic transformer comprises an MMC, a plurality of DAB converters and an inverter. Wherein the MMC and the DAB converter are respectively connected to the MMC main controller and the DAB main controller, so that the power electronic transformer generates alternating current voltage, direct current voltage or alternating current under the control of the MMC main controller and the DAB main controller; the alternating-current voltage comprises high-frequency, power-frequency or low-frequency alternating-current voltage; and the alternating current comprises high-frequency or power-frequency alternating current. According to the invention, the accuracy, reliability, safety and practicability of the aging test of the cable and accessories thereof can be improved from multiple aspects, and the cost is reduced.

The present invention discloses an IPM protection device, a motor and an IPM protection method thereof, the device comprising: a current sampling circuit, a first overcurrent protection circuit, a second overcurrent protection circuit and a controller; wherein the current sampling circuit is used to collect the three-phase current of the motor driven by the IPM to be protected, and output a first output signal when the current sampling circuit is normal, or output a second output signal when the current sampling circuit is abnormal; the first overcurrent protection circuit is used to implement overcurrent protection for the IPM to be protected according to the first output signal under the control of the controller; the second overcurrent protection circuit is used to implement overcurrent protection for the IPM to be protected according to the second output signal under the control of the controller. The solution of the present invention can solve the problem of poor protection reliability caused by the internal power device of the IPM being burned after the operational amplifier chip in the current sampling circuit fails, thereby achieving the effect of improving protection reliability.

The utility model discloses a light-emitting diode (LED) lamp for elevator shaft lighting, which relates to the technical field of LED lamps and comprises a lampshade, the upper surface of the lampshade is fixedly connected with a connecting base, the lower surface of the connecting base is provided with a threaded insertion hole, the upper surface of the connecting base is movably connected with a cooling circulation chamber, and the center of the upper surface of the cooling circulation chamber is provided with a limiting groove. The lower surface of the light source circuit board is movably connected with a buffering pad, the lower surface of the light source circuit board is fixedly connected with five lamp tubes, the lamp tubes are matched with the limiting grooves, heat in the heat dissipation chamber and the air exhaust chamber is upwards discharged to the external environment through rotation of the fan, and a dustproof net in the dustproof cover can be used for preventing dust from entering the heat dissipation chamber and the air exhaust chamber. External dust is isolated outside the device, so that the dust cannot fall onto the fan and the heat dissipation fins to affect the heat dissipation efficiency, and the problem that in the prior art, a large amount of heat cannot be dissipated after illumination is used for a long time, and a circuit board of an LED lamp is burnt out due to over-high temperature is solved.

The invention relates to a motor restart protection method and system, and belongs to the technical field of motor protection, and the method comprises the steps: controlling the restart of a motor to prohibit the restart of the motor in the period if the motor start heating cumulative frequency in the set period is greater than a set upper limit threshold; the determination mode of the motor starting heating accumulated number of times comprises the following steps of: adding 1 to the motor starting heating accumulated number of times when the motor stator current rises from no current to be greater than a current starting set value every time; every time the motor finishes heat dissipation, the motor starting heating cumulative frequency is subtracted by 1. According to the invention, the heat accumulation behavior of the motor, which really influences the operation of the motor, is limited, the normal operation of the motor is ensured, and the problem that the motor is burnt due to excessive heat accumulation caused by too many times of short-time starting of the motor is solved.

The utility model relates to power semiconductor's test technical field especially, and more particularly to a kind of double-pulse test structure of power semiconductor, the structure includes: laminated busbar and the protection mechanism being set on the laminated busbar;The protection mechanism includes: switch tube, auxiliary diode, first accommodating groove and second accommodating groove;The switch tube is connected with the auxiliary diode, the first accommodating groove and the second accommodating groove are all set on the laminated busbar, the switch tube is located in the first accommodating groove, the auxiliary diode is located in the second accommodating groove.By the structure, avoid the failure of the device under test when double-pulse test is carried out to the device under test to exert larger voltage and current, to avoid making the test loop be in short-circuit uncontrollable state, test loop current is constantly increasing until the device burns, prevent the entire test system from burning, improve the reliability and security in the double-pulse test process to the device under test.

The invention provides a communication device and a communication method, the communication device comprises a positive input end, a negative input end, a pre-stage circuit device and a post-stage circuit device, one end of the post-stage circuit device is connected with an output end of the pre-stage circuit device, and the other end of the post-stage circuit device is connected with the negative input end. The preceding-stage circuit device comprises a controller and a switching device, the positive input end is connected with the first end of the switching device, the second end of the switching device is connected with the controller, the third end of the switching device is connected with a ground wire, and the controller is used for detecting the voltage difference between the first end and the third end of the switching device; and controlling the switch-on or switch-off of the switching device according to the voltage difference. Based on the above technical problem, the problem of short circuit to ground caused by reverse connection between the RTN of the power distribution system and the-48V of the communication device can be solved, and the problem of carbonization or burning of parts such as a single board, a cable and a device caused by short circuit to ground is further avoided.

The present invention discloses a motor controller insulation detection method and system based on CAN bus control, and relates to the technical field of new energy motor controller testing, wherein the motor controller insulation detection method based on CAN bus control comprises the following steps: collecting the insulation impedance to ground during the motor controller test; according to the magnitude relationship between the insulation impedance to ground and the thresholds at each level, feedback and control are performed through CAN messages to determine whether to maintain the test of the motor controller. The present invention can effectively solve the problem that a large number of IGBTs of the motor controller are burned out during the development of the motor controller due to hardware design defects or software control logic defects in the research and development stage.