59results about How to "Avoid insulation failure" patented technology

The invention discloses a motor capable of realizing a stator closed and rotor open ventilation mode by adopting axial-flow ventilation. An adopted shaft is provided with an external circumferential spiral groove, and the spiral groove matches with axial-flow fans with two clingy ends and the same spiral directions to form an axial-flow combined ventilation apparatus; the apparatus is arranged in a rotor and at two ends of the rotor, and the extra axial space of the motor is not occupied, so that the motor is compact in structure; due to different steering directions, airflow directions are also different but the motor can be cooled; in combination with labyrinth seal, a combined cooling mode of stator closed ventilation cooling and rotor open ventilation cooling of the motor is realized, and the combined cooling mode enables the insulation reliability of a stator and the heat dissipation capability of a rotor to be both ensured and improves the motor efficiency; a stator cooling air duct consists of vent holes (2x), a stator air duct (2h) and an air duct section (6h); a rotor cooling air duct consists of vent holes (5y), gaps (9b), a spiral groove (4b) and gaps (10b); the two cooling air ducts are connected in series; and the spiral combined apparatus provides air pressures for the cooling air ducts.

The invention relates to the technical field of submarine observation equipment, in particular to a pressure-balanced photoelectric separation device for main submarine base stations. The device includes a submarine cable, an armored steel wire fixing mechanism, a cable core sealing protection mechanism and an oil-filled tank body mechanism. The submarine cable includes an armored steel wire (1) and a submarine cable core (12). The submarine cable core (12) is wrapped with a PE insulating layer, and a copper conductor (13) and an optical fiber unit (16) are arranged inside the submarine cablecore (12). The armored steel wire fixing mechanism is in butt joint with the cable core sealing protection mechanism, and the cable core sealing protection mechanism is in butt joint with the oil-filled tank body mechanism. The submarine cable is inserted into the armored steel wire fixing mechanism, and passes through the cable core sealing protection mechanism to the inside of the oil-filled tank body mechanism. The copper conductor (13) is connected through electrical leading with an electrical cable cabin-penetrating part (15) arranged at the end of the oil-filled tank body mechanism. Theoptical fiber unit (16) is directly welded to an optical cable cabin-penetrating part (18). The problem that a submarine cable core creeps into a photoelectric separation cabin under the pressure of deep water is solved.

The invention discloses a totally enclosed motor for achieving separate cooling of a stator and a rotor by a dual-channel fan. The dual-channel fan 9 with a unique design is adopted and matched with a motor structure, so that a combined cooling mode of enclosed ventilation cooling of the stator and open ventilation cooling of the rotor of a three-phase asynchronous motor is achieved. By the combined cooling mode, the stator insulating reliability and the rotor cooling capacity are ensured; and the motor efficiency is improved. The dual-channel fan 9 can play roles of two fans, so that the motor structure is compact. Fan blades of the dual-channel fan are divided into two groups 9c and 9f, and are in staggered distribution in the circumference. Air ducts 5a, 10a, 3a, 9a, 9c, 9b and 6a form independent rotor cooling air ducts; the air ducts 6b, 9d, 9f, 9e and 2a form independent stator cooling air ducts; a convex edge 5b and a toothed plate 11 form a labyrinth seal; a fan excircle 9g and the convex edges 6d and 6e are in small-gap fit; and a stator space is isolated from a rotor space.

The invention discloses a stator and rotor temperature field measurement system of a starting and generating integrated motor used for a hybrid vehicle. Patch-typed stator temperature sensors are arranged in different winding coil clearances of an ISG motor stator; signal output leads of the patch-typed stator temperature sensors are connected with an A/D converter by which the patch-typed stator temperature sensors are connected with a computer; patch-typed rotor temperature sensors are arranged in magnetic steel sheets of the ISG motor rotor, with signal output wires connected with signal output contacts of the external edge of the motor rotor; the signal is input into the A/D converter by a measurement probe and is then transmitted into the computer. The temperature increment curve of the stator winding and rotor magnetic steel sheets can be output by an ISG motor temperature field test when the ISG motor outputs fixed power; meanwhile, the temperature distribution of the ISG motor can be measured under the output states of various rotation speeds and various powers.

The invention discloses a method for manufacturing a multilayer PCB in a plate pressing mode. The method comprises the steps that plate pressing is conducted through two steps, wherein the first step of pressing is conducted, press fitting is conducted on stacked layers through an upper steel plate and a lower steel plate, silicone rubber layers are arranged between the upper steel plate and the stacked layers and between the lower steel plate and the stacked layers so that the stacked layers can be evenly stressed, and the stacked layers are formed by sequentially stacking copper foil, prepreg, an inner core plate, prepreg and copper foil; the second step of pressing is conducted, press fitting is conducted on the multilayer PCB through the upper steel plate and the lower steel plate, and silicone rubber layers are arranged between the upper steel plate and the multilayer PCB and between the lower steel plate and the multilayer PCB so that the multilayer PCB can be evenly stressed, and the multilayer PCB comprises two layers of new copper foil, the N stacked layers which are arranged between the two layers of new copper foil and obtained through the first step of pressing with the double-face copper foil corroded, and prepreg arranged between the N stacked layers and between the stacked layers and the new copper foil. By means of the method for manufacturing the multilayer PCB in the plate pressing mode, the phenomena of interlayer cavities, insufficient interlayer combining force and layer deviation can be effectively controlled.

The invention provides a metro shielding door insulation structure. The metro shielding door insulation structure is arranged between a platform and a threshold, wherein a platform plate is protruded from the platform toward a rail side, an insulation glue layer is wrapped around the whole surface of the platform plate, an L-shaped insulation padding plate is arranged on a portion of a U-shaped support of the threshold, connected with the platform plate, an L-shaped insulation support is arranged between the platform plate and a platform side, an insulation glue strip is inlaid between a threshold profile on the upper portion of the threshold and the L-shaped insulation support, a U-shaped support on the lower portion of the threshold is fixed on the platform plate through a penetration bolt, and the penetration bolt is isolated through an upper insulating bush, a lower insulating bush and a bolt protecting bush, and therefore no conductive area generated by pollution exists, and furthermore insulation failure is effectively avoided.

The invention discloses a preparing method of a corona resistance polyimide composite film. A roller coating layer and a middle layer are included. The roller coating layer is formed through aminationafter a polyimide/inorganic particle hybrid glue solution is subjected to one-time or multi-layer roller coating on the two faces of the middle layer, and the middle layer is a polyimide pure layer.According to the prepared polyimide composite film, continuous industrial production of multiple layers of corona resistance polyimide composite films is achieved, on the basis that the corona resistance performance is excellent, the mechanical performance is more excellent, and the preparing method is suitable for large-scale industrial continuous production.

The invention discloses a high-voltage direct current insulation monitoring system and monitoring method. The system comprises a control module, the control module is connected with a bus monitoring module and a branch monitoring module, and carries out insulation monitoring on a bus and a branch, the bus monitoring module comprises a voltage measurement unit, a calculation and analysis unit, and a monitoring bridge unit, the calculation and analysis unit is used for calculating a voltage difference, a current value and an insulation resistance value of a bus anode and a bus cathode, and judging an insulation fault according to the change conditions of the voltage difference and the insulation resistance value, the branch monitoring module is connected with a branch unit and a communication unit, and the branch monitoring module is used for monitoring the insulation condition of the branch unit and transmitting monitoring data through the communication unit. Insulation faults are preliminarily judged through the voltage measurement unit, so that bus faults and branch faults can be distinguished; insulation states are monitored through the bus monitoring module and the branch monitoring module; and switch switching is replaced with potentiometer adjustment, so that voltage-to-ground fluctuation is reduced.

The invention provides a method for rapidly repairing the damage of a directly-buried cable, which is particularly suitable for repairing the damage of a cable outer sheath or the main insulation of the cable, the insulation sealing performance of the cable is recovered by using a high-voltage waterproof insulation composite adhesive tape in a semi-lapping manner, the mechanical damage resistanceof the cable is recovered by using an industrial armor wrapping tape, and the cable does not need to be cut off. The original main body structure of the cable does not need to be damaged, and only thedamaged part of the cable needs to be repaired to prevent water and moisture from entering the cable to cause insulation faults of the cable. Compared with a traditional repairing method, the high-voltage waterproof insulation composite adhesive tape is used for recovering the insulation sealing performance of the cable in a half-lap wrapping mode, the industrial armor wrapping tape is used for recovering the cable, rapidness and convenience are achieved, and the cost is low; no intermediate joint is generated, the primitiveness of the cable is ensured, and the original electrical insulationperformance of the cable is ensured; and only a fault point needs to be excavated, and the earth excavation amount is reduced.

The invention discloses a three-position operating mechanism with a buffering function. The three-position operating mechanism comprises a mechanism front plate, a mechanism rear plate, an output shaft module, a grounding side closing and separating module, an isolation side closing and separating module, a spring module and a buffering module. All the modules are assembled between the mechanism front plate and the mechanism rear plate. The output shaft module comprises an output shaft, an output shaft crank arm and a driving pull rod. The output shaft is arranged on the middle part of the mechanism rear plate. The grounding side closing and separating module and the isolation side closing and separating module are distributed at the two sides of the output shaft with the output shaft acting as the center. The output shaft crank arm is pivotally connected on the output shaft. The buffering module is fixed on the mechanism rear plate. One end of the buffering module abuts against the external side of the output shaft crank arm. An insulation fault caused by overshooting in separating can be prevented so that the safety of operation can be enhanced.

A kind of transformer part turns on electricity an extremely high examination device, belonging to electricity equipments to insulate monitor technique realm. The invention mainly includes the pole sub- antenna of a set of tube list to spread a feeling machine and enlarges a filter, high speed numeral to collect machine and calculator. Set the tube list pole sub- antenna of the invention spreads a feeling machine to be flapped son, metals set a tube by the metals radiation and deliver line and metals scale board and N type of the electric cable with stalk to deal with contact to constitute. Because the invention has a higher intelligent degree and believes a ratio, can examine clear and accurate transformer occurrence part turn on electricity the extremely high electromagnetic wave produced signal, can availably to transform internal occurrence of part on electricity to carry on on-line monitor, so it can be used for the oil immerse type transformer with 110-500 kV extensively.

The invention discloses an on-line insulation performance monitoring system for urban rail transit direct current equipment and a control method. The system comprises an insulation performance measuring module, an insulation performance collecting system, a switch module and a control center, wherein the insulation measuring module is installed between an equipment frame of a rectifier cabinet, adirect-current switch cabinet and an inverter feedback device cabinet and a grounding busbar and is connected to the insulation acquisition system; an electric isolating switch between a cabinet shelland the insulation measuring module is in a normally open state; a switch between a centralized grounding point of a frame protection element and the grounding busbar is in a normally closed state; the insulation measuring module is used for measuring the insulation resistance data of the cabinet body and sending the insulation resistance data to the control center through the insulation acquisition module; and the control center is regularly sending a monitoring signal for maintaining the state of the switch module, continuously receiving insulation resistance data, performing logic judgmentand acting on the switch module. According to the system, the insulation performance of the urban rail transit direct current equipment can be monitored online, the misoperation of a frame protectiondevice can be avoided, and the reliability is high.

The invention relates to a device for monitoring GIS internal partial discharge, in particular to a built-in pre-buried ultrahigh-frequency GIS internal partial discharge monitoring sensor. The sensor comprises an insulator, a guiding device and a radio-frequency connector, wherein the insulator is perpendicularly connected to the interior of a grounding shell, the circumferential portion of the insulator is connected with the cylinder wall of the shell, the edge of the insulator extends out of the shell, the guiding device comprises a high-voltage conductor and an antenna, the high-voltage conductor is arranged along the axis of the grounding shell and penetrates through the insulator, the two ends of the high-pressure conductor extend out of the insulator, the antenna is annular, the section of the antenna is in the shape of a circle or a long circle, the antenna is embedded into the insulator, one end of the radio-frequency connector is connected with the antenna, and the other end of the radio-frequency connector extends out of the edge of the antenna. The sensor has the advantages that monitoring position is flexible, monitoring range is wide, monitoring sensitivity is high, the uniform electric field of an original coaxial cylindrical structure is not changed, original insulation margin is increased, and cost is low.

The invention discloses a three-phase sealing structure of an oil-cooled motor. The three-phase sealing structure comprises a generator, a speed reducer, the oil-cooled motor and a controller, wherein the generator and the oil-cooled motor are distributed on the two sides of the speed reducer, and the controller is arranged over the oil-cooled motor; the oil-cooled motor comprises a three-phase cover plate, an oil-cooled motor casing, a first three-phase buckle and a second three-phase buckle; the oil-cooled motor is connected and sealed through a three-phase cover plate, and the three-phase cover plate and the oil-cooled motor shell form a three-phase sealing structure; the first three-phase buckle is used for fixing a three-phase line to form a fixed path, and the second three-phase buckle is used for sealing a three-phase outgoing line. A three-phase line is led out from a motor stator winding, is fixed through a first three-phase buckle, is sealed through a second three-phase buckle and enters a three-phase chamber, and a three-phase line copper nose extends into the controller. The three-phase line and the copper nose are completely isolated, the risk of insulation failure of the motor is reduced, motor oil mist is prevented from entering the controller in a high-temperature environment, and the risk of failure of electrical components is reduced.

The invention discloses an electric dust remover and a cathode rapping insulation device thereof.The cathode rapping insulation device comprises a rapping shaft and a rapping box, and the rapping shaft penetrates through a wall plate of an electric dust remover shell and extends into the electric dust remover; the device further comprises an insulating pipe, a lantern ring and a hot air source. The vibrating shaft is sleeved with the insulating pipe, the insulating pipe and the vibrating shaft are not in contact, one end of the insulating pipe is located in the vibrating box, and the other end of the insulating pipe is located in the electric dust remover; the lantern ring is sleeved outside the insulating pipe, the lantern ring and the insulating pipe are not in contact, one end of the lantern ring is fixedly connected with the wall plate in a sealing manner, and the other end of the lantern ring extends into the electric dust remover; an air inlet is formed in the rapping box, and the hot air source is communicated with the air inlet, so that hot air enters the rapping box, and air curtains are formed between the insulating pipe and the rapping shaft and between the lantern ring and the insulating pipe. The device can ensure the insulation effect of the cathode rapping shaft.

The invention discloses a battery cell module and an electric vehicle. The battery cell module comprises a box body, a plurality of side boxes and a plurality of battery cells, the box body is provided with a first mounting surface, a second mounting surface, a main cooling chamber and a cooling medium outlet, the side boxes are provided with side cooling chambers, the side cooling chambers are bidirectionally communicated with the main cooling chamber, the side boxes are arranged on the second mounting surface, the bottom surfaces of the square battery cells are attached to the first mounting surface, and the two opposite side surfaces abut against the surfaces of the side boxes. A cooling medium enters the side cooling chambers through the main cooling chamber, then returns to the main cooling chamber through the side cooling chambers, and finally leaves the box body through the cooling medium outlet. The bottom of the battery cell is attached to the first mounting surface, and the two sides of the battery cell abut against the side surface of the side box, so that when the cooling medium flows in the battery cell module, the cooling medium does not make contact with the battery cell, the purpose of cooling the square battery cell can be achieved, and the insulation failure of the battery cell is avoided.