87results about How to "Avoid burning accidents" patented technology

The invention relates to a method for correcting a phase sequence of a power line of a permanent magnet synchronous motor driver of an electric car. The permanent magnet synchronous motor driver inputs low currents in the fixed direction into a permanent magnet synchronous motor to enable the motor to rotate, the connecting phase sequence of the power lines of the driver and the motor is judged through the forward and reverse rotating direction of the motor, then a collected rotor electrical angle is corrected, and therefore the motor can operate normally. The connecting phase sequence of the power lines of the driver and the motor does not need to be known, and the connecting phase sequence can be judged automatically. When the connecting phase sequence is not correct, the power line does not need to be connected again. Therefore, in the development process of the three-phase permanent magnet synchronous motor driver of the electric car or the maintenance process of the electric car, technicists can connect the power lines of the driver and the motor freely, line connection, phase sequence testing and other complex work are reduced, development and maintenance work efficiency can be greatly improved, and the accident that the motor or a controller is burnt up due to phase sequence errors is effectively avoided.

The invention relates to a bearing with an axial buffer function, which comprises a bearing left cover and a bearing right cover that are arranged at intervals, wherein a rolling bearing bush is arranged between the bearing left cover and the bearing right cover, the bearing left cover, the bearing right cover and the rolling bearing bush are fixed into a whole, an inner ring body is arranged inside the rolling bearing bush, an external ring body is arranged outside the inner ring body, a rolling body is arranged between the inner ring body and the outer ring body, an axial pretightening spring is arranged on the bearing right cover and supports against the right end face of the outer ring body, an oil thrower pretightening ring is arranged between the left side of the inner ring body and the right side of the bearing left cover, the right end face of the oil thrower pretightening ring supports against the left end face of the inner ring body, and the left end face of the oil thrower pretightening ting supports against the right end face of an axial baffle ring on a rotating shaft. The invention ensures that the axial direction of the whole air side deep groove ball bearing device is not limited so that the seizure burn up accidents possibly generated by limited tail and head sides of the rotating shaft are prevented.

The invention relates to a three-phase asynchronous motor for an explosion-proof fan, and relates to the technical filed of motors. The three-phase asynchronous motor comprises a motor body, a case sleeving the motor body, fan blades coaxially fixed to an output shaft of the motor body, and a dehumidification mechanism arranged on the motor body and used for dehumidification; and the dehumidification mechanism comprises a plurality of heating sheets arranged on the inner wall of the case and distributed around the circumferential side of the motor body at equal angles, a plurality of gas holesare formed in the motor body in the two axial ends of the motor body, a heat conducting layer is arranged between the heating sheets and the motor body, the gas holes are opposite to the fan blades,and a plurality of convection holes are formed in the circumferential surface of the motor body. The three-phase asynchronous motor has the effect that the motor burnout accident caused by the fact that the motor is affected by the damp is avoided, so that the service life of the motor is prolonged.

The invention provides a drying device for an EVA (Ethylene Vinyl Acetute) sample crosslinking degree test. The drying device comprises a thermal-insulating oven, a tank cover, a fluid removal barrel, a motor, a drainage electromagnetic reversing valve, a fluid drainage tube, a gas transmission electromagnetic reversing valve, a hot air inlet tube and a hot air exhaust tube, wherein the fluid removal barrel driven by the motor is arranged in the thermal-insulating oven; the fluid drainage tube and the hot air inlet tube are arranged at the bottom of the thermal-insulating oven; in the height direction, the fluid drainage tube is positioned under the hot air inlet tube; the fluid drainage tube is communicated with the cavity of the thermal-insulating oven; the hot air inlet tube is communicated with the cavity of a closed drying tank body; and the hot air exhaust tube is communicated with the upper side of the cavity of the thermal-insulating oven. By using the device, an extracted EVA rubber sample can be directly subjected to fluid removal and drying, a toxic dimethylbenzene solvent is concentrically recycled, so that the toxic dimethylbenzene solvent is prevented from overflowing to pollute the environment and hurting operators; and drying is carried out by adopting hot air flow at the temperature of between 30 and 50 DEG C, so that burning accidents of the dimethylbenzene in a drying process can be effectively prevented, and the EVA rubber sample can be dried quickly.

The invention discloses a power equipment and transmission line malfunction comprehensive online monitoring system which comprises a wireless temperature measuring terminal, a line malfunction detector, a transfer station, an information receiving main station, a database server and a monitoring host. The wireless temperature measuring terminal is wirelessly connected with the information receiving main station through a built-in wireless communication module, the line malfunction detector is wirelessly connected with the information receiving main station through a built-in wireless communication module and the transfer station, and the information receiving main station is connected with the database server which is connected with the monitoring host. The system can monitor and upload power equipment temperature rise standard exceeding and transmission line ground fault information in real time, quickly locate line fault sections and fault branches, shorten fault clearing time and improve safety and reliability of power equipment and transmission lines.

The invention discloses a grounding transfer current detection compensation device and a working method thereof. The device is characterized in that a first current transformer (11) is connected between a moving contact of a high pressure switch (9) and a grounding terminal (10) of the device in series; the input end of a controller (7) is electrically connected with a voltage transformer (2) and the first current transformer (11); the output end of the controller (7) is electrically connected with the control end of the high pressure switch (9); the high pressure switch (9) is in parallel connected with an arc suppression part, wherein one end of an arc suppression coil (5) is electrically connected with a neutral point of a grounding transformer (3) through a second current transformer (4), the other end of the arc suppression coil (5) is electrically connected with the grounding terminal (10); a secondary coil of the arc suppression coil (5) is electrically connected with the controller (7) through a programmable power supply (6); and the controller (7) is electrically connected with the second current transformer (4). The working method comprises the following steps of obtaining a capacitor-current value of a fault phase from the first current transformer when the high pressure switch of the fault phase is closed, so as to start the arc suppression coil to produce compensation current. The device and method provided by the invention can be used for 3-66 kV neutral point non-directly grounding systems.

The invention discloses an intelligent inspection management system for power equipment. The intelligent inspection management system comprises a wireless temperature measurement terminal, an intelligent hand-held terminal, an information receiving station, a database server, a temperature monitoring terminal, an equipment management terminal and an asset management terminal, wherein the wireless temperature measurement terminal and the intelligent hand-held terminal are in wireless connection with the information receiving station through a built-in GPRS communication module respectively; the information receiving station is connected with the database server; and the temperature monitoring terminal, the equipment management terminal and the asset management terminal are respectively connected with the database server. According to the system, on one hand, the abnormal condition of the power equipment in operation can be timely found out, and can be processed within the shortest period of time; the inspection quality and the work efficiency of a patrol officer are ensured; the reliability of the power equipment is improved; and the potential safety hazards are eliminated; and on the other hand, the management level of the full life circle of enterprise equipment asset can be improved.

The invention relates to an intelligent control method and an intelligent control device for an electric horn. The dynamic frequency stabilization control method for the electric horn comprises the following steps of: driving the electric horn to work after square wave signals output by a singlechip are subjected to power amplification, then adjusting the frequency of the square wave signals in amode of gradual increasing or gradual reducing with adjusting quantity of 0.005 to 5.0Hz, and meanwhile, detecting the vibration strength of a vibrating diaphragm of the electric horn through the singlechip so as to find the natural vibration frequency of the electric horn. The control device of the electric horn comprises a bowl-shaped bottom shell, a static iron core, a dynamic iron core, a coil, the vibrating diaphragm and a control circuit, wherein the control circuit comprises a micro processing module, a power supply module, a coil driving module, a key input module and a vibrating diaphragm vibration signal detecting module. The invention provides the intelligent control method and the intelligent control device for the electric horn, which can automatically adjust the driving frequency in real time and automatically stabilize the sound pressure level, wherein the device has environment-friendly sound production function and is convenient to connect keys.

The invention discloses an energy-storage spring operating mechanism of a low-voltage isolating switch, which is installed at the top of the low-voltage isolation switch. The energy-storage spring operating mechanism comprises an operating shaft, shifting rods and a stroke compensation part, wherein the operating shaft is installed at the top of the low-voltage isolating switch and can rotate freely along a radial direction; two shifting rods are provided, are perpendicular to each other and are fixedly arranged at the bottom of the operating shaft; a structure of the stroke compensation part is as follows: a spring installation shaft is hinged onto the operating shaft, and a first elongated through hole is formed in a movable end of the spring; a spring sleeves the spring installation shaft; a rotating shaft is hinged to the top of the low-voltage isolating switch; a short arm and a long arm are respectively perpendicularly fixed on the rotating shaft; the bottom end of a first shaft is fixed between the long arm and the short arm and penetrates through the first elongated through hole; a second elongated through hole is formed in a movable end of the long arm, and a second shaft can be driven by the shifting rod to slide along the second elongated hole; and a cylindrical projection is fixedly formed at the bottom of the long arm. By designing the stroke compensation part, the energy-storage spring operating mechanism can ensure that the switch action is unrelated to the manual operation.

The invention discloses a low-voltage distribution network null wire break protector. The low-voltage distribution network null wire break protector is characterized by being composed of a switch, a voltage relay, an alternating-current contactor and a signal transmitter. Inlet wires L1, L2 and L3 of the voltage relay are connected with an A phase live wire, a B phase live wire and a C phase live wire of a low-voltage distribution network through the switch respectively, an inlet wire N is connected with a null wire, and normally open contacts 98 and 97 are connected with the B phase live wire and a coil of the alternating-current contactor respectively; the normally open main contact side of the alternating-current contactor is connected with the null wire of the distribution network, and the other side of the alternating-current contactor is connected with a grounding body; one end of the signal transmitter is connected with the normally open contact 97 of the voltage relay, and the other end of the signal transmitter is connected with the grounding body. The low-voltage distribution network null wire break protector has the advantages that when the null wire breaks, work grounding is temporarily formed behind the wire break point so that the three-phase voltage can achieve basic balance; a voltage value is within a rated range of electric equipment, the accident of burning the electric equipment is eradicated, normal work of the electric equipment is not affected, and normal operation of the whole zone area distribution network is not affected either.

A multi-row synchronous rotating injection device for assisting sintering includes a sintering pallet. An injection sealing cover is arranged above the sintering pallet. At least one gas blowing pipeand at least one gas branch pipe are arranged above the sintering pallet in the injection sealing cover. Each gas branch pipe is connected with at least one gas blowing pipe. A gas main pipe is arranged outside an injection sealing device. The gas branch pipe is connected with the gas main pipe and the gas blowing pipe through the injection sealing device. The gas blowing pipe includes an injection pipeline and an injection pipe blowing holes. One group of injection pipe blowing holes is formed circumferentially in the injection pipeline. At least one group of injection blowing holes is distributed in sequence in an axial direction of the injection pipeline. One group of injection pipe blowing holes has at least two injection pipe blowing holes. A plugging pipe is arranged in the injectionpipeline in the coaxial line. The plugging pipe is provided with at least one cavity opening to the injection pipe along the axis direction. The part outside the cavity is a solid or a hollow cavitysealed at both ends. The plugging pipe is connected to a driving device for driving the plugging pipe to rotate.

The invention discloses a strain clamp drainage plate with a temperature control heating automatic shunting and alarm apparatus. The strain clamp drainage plate with the temperature control heating automatic shunting and alarm apparatus comprises a strain clamp drainage plate and is characterized in that a bimetallic temperature measurement sheet is fixed on a bolt fixation plate of the strain clamp drainage plate, and the inner-side wall of the strain clamp drainage plate is provided with a shunting lead wire; the central portion of the shunting lead wire is fixed on the inner-side wall of the strain clamp drainage plate through a plastic clamp; a conduction apparatus is arranged at a position, which bridges over the bimetallic temperature measurement sheet, of the shunting lead wire, and the handle end of the strain clamp drainage plate is provided with an alarm. The strain clamp drainage plate, when being heated to a limited scope value due to a resistance increase, can automatically reduce current intensity, flowing through the strain clamp drainage plate, of a power transmission line so as to reduce the heat productivity of the strain clamp drainage plate; and at the same time, when a continuous temperature rise cannot be controlled through shunting, an alarm is immediately given, maintenance or replacement is carried out through timely manual high-altitude operation, and thus the strain clamp drainage plate is effectively prevented from a burnout accident.

The invention discloses a dry reactor turn-to-turn short-circuit fault protection device and a method thereof. The protection device comprises a monitoring host, a data acquisition module, a voltage transformer, a current transformer, an alarm device and a circuit breaker. The data acquisition module collects the voltage instantaneous value and the current instantaneous value of the dry reactor and performs FFT conversion on the voltage instantaneous value and the current instantaneous value, eliminating the effects of harmonic components of voltage and current, Then the loss ratio and inductance value of the dry reactor can be calculated accurately, and the possible short circuit of the dry reactor can be predicted according to the loss ratio and inductance value, and the alarm can be provided. At the same time, the automatic circuit breaker action can be made according to the short circuit fault, which ensures the circuit safety and avoids the burning accident of the dry reactor.

The invention relates to an alternating-current test device for bare switch operating characteristics of a transformer on-load tap-changer, and belongs to the technical field of transformer switches. The invention aims to provide a transformer on-load tap-changer bare switch operating characteristic alternating-current test device which carries out an operating characteristic alternating-current test in allusion to a bare switch of an on-load tap-changer. The test device provided by the invention is characterized in that the 220V alternating-current mains supply is connected through an interface P1 at first and then transmitted to a transformer T1 and an AC-DC conversion chip respectively through a switch S1, pins 5, 6, pins 3, 4 and pins 1, 2 of an interface IN are externally connected with the output ends of a phase A, a phase B and a phase C of the bare switch of the on-load tap-changer in series respectively, and an output interface of an operating circuit of each phase of the bare switch is equipped with a resistor R; and the pins 5, 6, the pins 3, 4 and the pins 1, 2 are internally connected to pins 1, 2 of the input ends of current sensors S, S2, S3 respectively, and the current sensors S1, S2, S3 respectively correspond to the phase A, the phase B and the phase C of the bare switch of the on-load tap-changer respectively. The alternating-current test device discovers and judges problems such as insufficient contact pressure of a switch contact and the like in allusion to the bare switch of the on-load tap-changer without a transformer winding, the test effect and the test efficiency are improved, and a burning accident of power grid main equipment is effectively prevented.

The invention provides an interlocking mechanism of a ZW32 type column switch isolation knife and a switch mechanism. The interlocking mechanism comprises a mechanism interlocking plate, a limit shaft, a transmission link plate, a main shaft arm and a shaft sleeve. The mechanism interlocking plate is fixedly connected with a mechanism closing shaft and rotates synchronously with the mechanism closing shaft. The lower part of the main shaft arm is fixedly connected with an isolation knife brake main shaft. The upper part of the main shaft arm is hinged to one end of the transmission link plate.The other end of the transmission link plate is hinged to the right end of the limit shaft. The left end of the limit shaft can extend to the left to be engaged with the mechanism interlocking plate.The shaft sleeve sleeves the outer surface of the limit shaft and is fixedly connected with a circuit breaker casing. According to the invention, the interlocking mechanism of column switch isolationknife closing and the switch mechanism has a simple structure; the rotation of a circuit breaker closing shaft can be limited when the closing of an isolation knife brake is not in place; and switchburnout accidents caused by insufficient closing of the isolation knife brake and continued closing of a circuit breaker.

The invention relates to a safe water seal tank for safe incineration of asphalt smoke tail gas and a work method thereof. The safe water seal tank comprises a water seal tank body and a cyclone separator. The top of the water seal tank body is provided with an industrial water inlet, an asphalt smoke tail gas inlet and a smoke outlet. The asphalt smoke tail gas inlet is formed close to one end ofthe water seal tank body. The cyclone separator is arranged above the position close to the other end of the water seal tank body. The bottom of the cyclone separator communicates with the water sealtank body. A liquid seal baffle is arranged in the position, between the smoke outlet and the cyclone separator, in the water seal tank body. The upper portion of the cyclone separator is provided with a smoke inlet connected with the smoke outlet in the water seal tank body through a smoke connecting pipe. The top of the cyclone separator is provided with a tail gas outlet. The two sides of thewater seal tank body are provided with a first full flow opening and a second full flow opening correspondingly. According to the safe water seal tank for safe incineration of the asphalt smoke tail gas and the work method thereof, the quantity of flammable fogdrops caused by bubbling of the asphalt smoke tail gas in the water seal tank can be reduced, subsequent burning accidents in a pipeline are avoided, and potential safety hazards are eliminated.

The invention relates to hydroscillators, in particular to an inclined block eccentric type three-dimensional hydroscillator. The inclined block eccentric type three-dimensional hydroscillator is composed of a shell, an axial oscillation part and a radial oscillation part. An upper joint is arranged in a port in one end of an upper shell in a threaded manner, the axial oscillation rod is movably arranged at the position, below the upper joint, in the upper shell, the axial oscillation part is connected with the upper joint through a spring, the other end of the upper shell is provided with a lower shell in a threaded manner, the radial oscillation part is movably mounted in the lower shell through a thrust bearing, the radial oscillation part and the axial oscillation part are in clamped connection, and a lower joint is arranged on the bottom end of the lower shell in a threaded manner. The inclined block eccentric type three-dimensional hydroscillator has the advantages of being safe,reliable and good in oscillation effect. The problem that an existing oscillator is single in safety and oscillation effect is solved, and the oil and gas development needs can be met.