355results about How to "Won't burn out" patented technology

The invention provides an oil return control method during high-temperature refrigeration of a direct current variable frequency multi-unit machine. The method comprises the following steps of: (1) initializing parameters; (2) when a system operates for the time which is greater than or equal to Tb from previous oil return, and Fb is less than or equal to Fx, making that Fb is equal to Fx and operation time T is equal to Ty; and if frequency reduction protection is not available in the operation time T of the system, finishing the oil return; (3) if the frequency reduction protection is available in the system, recording the time Tf for the system to operate at the current frequency and calculating unfinished time T-Tf; (4) making that Fb is equal to Fb-f and operation time T is equal to 2(T-Tf); then if the frequency reduction protection is not available during operation time T of the system, finishing the oil return, and if the frequency reduction protection is available in the system, returning to the step (3) until the current operation frequency Fb is reduced to the minimum frequency Fmin for the operation of the compressor. By adopting the oil return control method, the compressor is not burnt down, the system is not damaged, and high reliability is guaranteed.

The present invention discloses an improved rotary forced-air cooler, which comprises a double layer trolley, a supporting beam structure, a material blocking proof air duct sealing plate arranged at the connecting part of the double layer trolley and an air supplying system, a double layer trolley unit static seal device and an air duct device. The supplying system structure is based on a rectangular beam, a triangle beam is arranged on the rectangular beam, and a plurality of ventilation channels are arranged on the bevel edge steel plates at the both waists; an air duct pipe is arranged on the air vent of the material blocking proof air duct sealing plate, an inclined plate inclining upwards from the air vent at the bottom part of the air duct pipe has a transition to a horizontal plate, a stopping ventilation fence is added to the air duct pipe at the side of the trolley; two rubber sealing parts with extended bottom edges are arranged at the outer sides of the lower parts of inner and outer sealing plates of the double layer trolley unit static seal device, an ash baffle plate which can move up and down is hung at the inner side; an air water sealing wave subduing device adopting a damping plate is arranged on the air duct device. The present invention further improves the sealing performance of the equipment, and reduces energy consumption and pollution.

The invention relates to an electric windshield wiper of automobile and a control method thereof; the electric windshield wiper of automobile comprises a first servo motor and a first wiper arm; the output of the first servo motor is connected with the first wiper shaft through a first shaft joint; the first wiper shaft is provided with the first wiper arm; the first wiper arm swings along the rotation of the first wiper shaft; the motor shaft of the servo motor is provided with a first position detection device; the first wiper arm is provided with magnetic steel; a magnetic induction element is installed at the corresponding position on the automobile; the first position detection device and the magnetic induction element transmit the detected position signal to a first servo controller; and the first servo controller controls the first servo motor and drives the first wiper arm to swing. The electric windshield wiper has simple structure and low cost, and screen wiper can swing discretionarily between 0 and 180 degrees with the protection function of stopping rotating; the speed can be adjusted without level, and the electric windshield wiper has high reliability and long service life.

The related all-purpose safe plug comprises: three poles every with switch; between phase and zero line, a zero-sequence current transformer, a test loop, an amplification circuit, a dc power, and a release device; a ground line connected by a movable contact spring and a fixed point; another zero-sequence current transformer in the ground line with secondary output end paralleled with another amplification circuit whose output serial connects with the trigger electrode of a thyristor. This invention can prevent electrification of three phase lines and over-temperature of plug self.

Provided by the invention is an arc plasma torch having an arc channel with an abnormal diameter. The arc plasma torch comprises an anode, a cathode, and an annular gas whirlcone. The anode is a circular tube with an abnormal inner bore diameter; the cathode is arranged in the inner bore of the anode circular tube; the gas whirlcone is arranged between the cathod front end and the anode; and the gas whirlcone, the cathode, and the inner bore of the anode circular tube are arranged coaxially. One end, provided with the cathode, of the anode circular tube serves as a gas inflow end and the other end serves as a gas outflow end; the anode circular tube is successively divided into a gas lead-in segment, a straight tube segment or reducing segment, a contraction segment, a groove segment and a nozzle segment; inner bores of the straight tube segment or reducing segment, the contraction segment, the groove segment and the nozzle segment of the anode circular tube forms an anode arc channel. And a tangential air flow channel is arranged at an annular wall of the gas whirlcone and is used for guiding gas into the inner bore of the gas whirlcone to generate an eddy air flow. According to the invention, the provided an arc plasma torch with the simple structure enables the arc power, the electrode life, and the energy utilization rate to be substantially improved.

To provide a rotor for synchronous induction motor capable of preventing the lowering of output or efficiency due to increasing magnetic resistance even if a gas venting hole is formed for using a hermetic compressor. This rotor includes slots for generating induction torque and slits for generating reluctance torque. The slot and the slits are filled with aluminum. The filling aluminum is shorted by end ring at both ends of the rotor, and a non-filling section axially passed through the slit and not filled with aluminum is provided.

The invention relates to a method for protecting a compressor of an air conditioning unit, which is characterized by comprising the following steps: 1) starting up and refrigerating: starting to count N=0 by a counter in the air conditioning unit, and executing step 2); 2) operating and executing step 3); 3) detecting return air temperature T1 of the air conditioning unit and coil temperature T2 of an evaporator and executing step 4); 4) recording operation time t, and executing step 5) and step 10); and 5) judging whether t is larger than or equal to 3min and (T1-T2) is smaller than 5 DEG C, executing step 6) if the above conditions are meet simultaneously, otherwise executing step 2). In the invention, only the control software part is required to change, so that the compressor of the air conditioning unit can avoid from being burnout in an abnormal condition, thus achieving the purpose of protecting the compressor under the premise of not changing the current air conditioning unit system; and the method has the characteristics of flexible operation, high safety degree and wide application range.

The invention provides an underwater spherical motor propeller. A stator core is in a spherical shape, the surface of the spherical stator core is provided with three grooves which are perpendicular to one another along a big circle, three-phase concentrated windings are placed in the grooves respectively and are pairwise perpendicular, the coils of the three-phase windings are connected to an underwater sealing plug by cables, a spherical sealed shell which is fixed with the stator core wraps the stator core, a spherical shell-shaped outer rotor is sleeved on the sealed shell through rubber bearings, the surface of the rubber bearings are provided with flumes, a rotor core is arranged between two rubber bearings, a slim clearance is reserved between the rotor core and the sealed shell, the rotor core, the rubber bearings and a rotor shell are combined together, and propeller blades are fixed on the rotor shell directly. In the invention, the vectored propulsion of the underwater spherical motor propeller is realized, the performance of the propeller is improved and the mechanical structure of the underwater working device is simplified, the mass and the volume of the underwater working device are reduced; therefore, the underwater working device has better utility and higher reliability.

The invention relates to the technical field of electronic cigarettes, in particular to a microporous ceramic heater for electronic cigarettes and a preparation method of the heater. The microporous ceramic heater comprises a ceramic carrier and a heating film arranged on the ceramic carrier, wherein the ceramic carrier is provided with a plurality of curved through holes running through the ceramic carrier; cigarette oil of an external electronic cigarette permeates into the curved through holes; and the heating film is used for heating the ceramic carrier so that the cigarette oil in the curved through holes is atomized and leaks out. The preparation method of the microporous ceramic heater is simple and efficient, operation and control are convenient, the product quality is stable, andindustrial production is facilitated; the ceramic carrier has the advantages that the strength is high, powder is unlikely to shed, and no peculiar smell is generated during use; the prepared microporous ceramic heater is resistant to dry burning, the bonding strength between the heating film and a ceramic body is high, there is no gap between a heating film circuit and the ceramic body after long-term use, and smoke leakage cannot happen.

The invention discloses a device and a method for searching a fallen unmanned plane. The device comprises a plane falling monitoring modules which are arranged on an unmanned plane and connected to each other and a power supply module having a positioning function; the plane falling monitoring module is connected to a power portion of the unmanned plane for monitoring whether the power portion is abnormal in real time and controls to output a first control signal to a power supply module; and a power supply module supplies power to the unmanned plane.

The invention discloses an agricultural perforating device which is convenient for heat dissipation and aperture adjustment, which comprises a base and a top plate. A first through hole is arranged in the middle of the inner part of the base, and universal wheels are arranged on both sides below the base. Both sides above the base are provided with connecting pipes, and the inside of the connecting pipe is provided with a second through hole, the bottom of the connecting plate is provided with a connecting rod, and the inside of the connecting plate is provided with a fixing ring, and the connecting rod A first limit block is arranged on the four sides, a movable block is installed at the upper port of the movable rod, and a magnet block is arranged on the side of the second limit block facing the central axis of the movable rod. The agricultural punching device that facilitates heat dissipation and hole diameter adjustment can ensure that the driver will not be burned out due to excessive temperature when the device works for a long time, and the device can change the diameter of the punched hole, which is convenient for users to choose Appropriate hole diameter to drill.

The invention relates to a protection device and a method for anti-phase / open-phase of a three-phase compressor, so as to solve the non-detection problem when the three-phase of the power supply of the compressor is reversely or erroneously grounded. The device comprises a three-phase compressor feed circuit, a three-phase voltage detection circuit, an anti-phase / open-phase detection circuit, a protection execution circuit, and a power supply circuit. The three-phase voltage detection circuit is composed of a diode rectification circuit bridged over the three-phase line and the ground and an optical coupling transistor circuit bridged over the two ends of the diode; the anti-phase / open-phase detection circuit is composed of a microprocessor input pin connected with the three output terminals of the three-phase voltage detection circuit, a triode relay circuit with the grid thereof connected with the output pin of the microprocessor, an anti-phase / open-phase sound alarm circuit and the power supply circuit; the protection execution circuit is composed of a contactor with the contact point connected with the feed circuit of the three-phase compressor in series and the damping coil thereof controlled by the contact point of the triode relay; and the power supply circuit is composed of the two-phase bridge type rectified, CR and filter circuit after being stepped down by the transformer in the three-phase power supply.

The invention relates to an electrothermal cutting machine with an automatic voltage-stabilized and constant-current device, which consists of a workbench plate, a vertical arm, an electric heating wire support arm, an electric heating wire and a circuit board for supplying operating current for the electric heating wire. The electrothermal cutting machine is characterized in that the vertical arm is composed of two parallel movable vertical arms; the circuit board is provided with a silicon controlled SCR and a triode BG; and a voltage stabilizing diode is connected between the collector electrode of the BG and the output end of the negative electrode of a power source in parallel. The electrothermal cutting machine has the advantages that the electric heating wire can be obliquely adjusted from side to side; and trapezoid, cone and various combined complex shapes are cut according to the requirements of a plastic model or a packaging article; the electrothermal cutting machine has convenient operation, simple structure and good consistency; and meanwhile when power supply voltage changes upwards and downwards, the electric heating wire works at a constant power and is not burned off.

The invention discloses a composite switch and methods of passing-zero switching control and self-switching fault judgment thereof, and belongs to the field of switch technology. The composite switch is capable of detecting self-switching fault, accurately detecting the passing zero point of alternating current voltage and switching. One end of a controlled silicon switch Kb and one end of a magnetic latching relay switch Kc are connected with number one node respectively. The other end of the controlled silicon switch Kb and one end of an inductance La are connected with a node Ma respectively. The other end of the inductance La and one end of number six switch are connected with a node Mb respectively. The other end of the magnetic latching relay switch Kc, the other end of the number one switch and the other end of number two switch are connected with a node Mc respectively. One end of a capacitor C2, the other end of number four switch, an anode end of a diode D1 and a cathode end of a diode D3 are connected with a node Md respectively. A silicon-driven circuit is connected with a control end and a controller of the controlled silicon switch Kb respectively. Magnetism-driven circuit is connected with a control end and a controller of the magnetic latching relay switch Kc respectively.

The invention belongs to equipment used in an electrified railway contact system, in particular to a bending moment-free anti-pollution high-speed segmenting and phase-splitting isolator, which is characterized by comprising a joint wire clamping plate (1), a joint wire clamp connecting plate (2), a connecting plate (3), a short sliding plate (4), a long sliding plate (10), a starting rod A (5), astarting rod B (5), a frame (6), an insulating sliding plate (7), silicon rubber isolators (8) and a fastening standard component (9), wherein the joint wire clamping plate (1) clamps a contact wire;and stressed axes of two silicon rubber isolators (8), the axes of connecting bolts at two ends of the connecting plate (3) and the groove of a contact lead are in the same axis. A pantograph of thebending moment-free anti-pollution high-speed segmenting and phase-splitting isolator can smoothly pass through at a high speed without generating bending moment, pantograph scratch and pantograph drilling. The bending moment-free anti-pollution high-speed segmenting and phase-splitting isolator cannot worn by the pantograph, has no pollution and cannot be burnt out by an electric arc.

The invention relates to an automatic welding device of a circuit board welding machine. The automatic welding device comprises an outer shell, a guiding pipe, branch pipes and a nozzle. The outer shell of the welding device is fixedly mounted at the lower end of a sliding arm, and the guiding pipe is coaxially mounted in the outer shell; the upper end of the guiding pipe is communicated with a hot air input device in a sealed mode, and the lower portion of the guiding pipe is communicated with multiple branch pipes in a sealed mode; the lower end of the guiding pipe penetrates through the lower end face of the outer shell and is connected with the nozzle in a sealed mode. According to the nozzle of the automatic welding device, a high-temperature soldering tin spraying mode is adopted, the control over the amount of the soldering tin can be achieved by controlling the flow of high-pressure gas, and pressure difference generated by high-speed air flowing is used for spraying the soldering tin so as to weld direct-plugging elements, so that the soldering tin is prevented from being bonded to the nozzle, and the welding quality is improved.

The invention relates to a protective suit. The protective suit comprises a fabric, a lining and an intermediate packing material, wherein yarns of the fabric consist of center yarns and coating yarns; the coating yarns are coated at the peripheries of the center yarns; the center yarns are formed by blending the following fiber in percentage by weight: 40-60% of continuous basalt fiber and 40-60% of carbon fiber; and the coated yarns are formed by blending the following fiber in percentage by weight: 35-42% of fire resistant fiber and 58-65% of camel wool fiber. The protective suit resists acid, alkali, high temperature and low temperature, has good moisture absorbability, and can absorb sweat generated by a human body; and the produced protective suit has the advantages of acid resistance, alkali resistance, high-temperature resistance, low-temperature resistance and good moisture absorbability.

The invention relates to a dual-fuel combustion chamber nozzle of a combustion gas turbine, and belongs to the technical field of combustion gas turbines. The dual-fuel combustion chamber nozzle comprises an axial center fuel channel, a peripheral axial annular fuel channel, a peripheral axial annular diluent gas channel, a first-level peripheral radial-direction annular air channel and a second-level peripheral radial-direction annular air channel, wherein the peripheral axial annular fuel channel, the peripheral axial annular diluent gas channel, the first-level peripheral radial-direction annular air channel and the second-level peripheral radial-direction annular air channel are arranged to be coaxial with the axial center fuel channel. The nozzle supplies fresh air to the head of a combustion chamber in a two-stage mode, meanwhile a diluent is divided into three plumes, one plume is supplied to fuel, one plume is supplied to first-level air, and another plume is supplied to second-level air; the ratio of the three plumes of the diluents can be adjusted according to the result of optimizing the performance of the combustion chamber, so that the sufficient air is supplied to the fuel for supporting combustion, and the good balance of efficient combustion and reduction of flame temperature is obtained; secondly, the diluents, the fuel and the air are mixed well and then enter a flame tube to take part in combustion, so that addition of the diluents does not disturb a inner flow field in the combustion chamber, and stability of combustion and good outlet temperature distribution are ensured.

A ground-fault circuit interrupter of a simple structure and easy to assemble and adjust, can surely make an operation check without making the size larger, and will not have a protection coil damaged even if a test button is kept pushing at the operation check test. The ground-fault circuit interrupter is provided with a test circuit 41 passing dummy leak current to a zero-phase current transformer 36 with one end wound around the zero-phase current transfer 36 and the other end connected to a main circuit 30, a leakage test switch 42 connected in the test circuit 41 and making an operation check of a ground-fault circuit interrupter by putting on and off dummy leakage current flowing in the test circuit 41, and a series switch 46 connected in series with the leakage test switch 42 and put on and off according to on / off and trip operations oft the ground- fault circuit interrupter, and it is so arranged that dummy leakage current shall not flow in the test circuit 41 when the ground-fault circuit interrupter is in the off or trip state, even if the leakage test switch 42 is operated.

The invention discloses a combined straight shank thread milling cutter which comprises a cutter rod body, wherein the cutter rod body comprises a cylindrical cutter handle part for clamping and a cylindrical cutter rack rod connected integrally with the cutter handle part; a surface cutting platform extending backward is manufactured on the front end of the cutter rack rod; a crumb discharging arc surface capable of discharging crumbs conveniently is formed on the tail part of the surface cutting platform; a cutting blade is positioned and installed detachably on the surface cutting platform through a fastening screw; the cutting blade is at least provided with one cutting head; and the cutter rod body and the cutting blade are combined and assembled so as to form a separating-type straight shank multi-purpose thread milling cutter structure. The combined straight shank thread milling cutter provided by the invention is concise in structure, is low in cost, has the characteristics of high machining accuracy, good effects, and long service life, can meet the machining requirements of multiple types of threads, and is suitable for deep hole machining.

The invention discloses an air heater, which comprises a direct sleeve, an air inlet disc and a cone, the two ends of the direct sleeve connect to the air inlet disc and cone individually, the spark plug, lighting hydrogen inlet, lighting air inlet, main flow hydrogen inlet and pure oxygen inlet are fixed on the air inlet disc, the jet is fixed on the cone. In that structure, the heat from burning hydrogen can warm the testing air in the cartridge heater, the included angle of the main flow hydrogen and pure oxygen is 30 deg. which can mix the hydrogen and oxygen even and burn completely. The lighting hydrogen inlet and lighting air inlet are set on the concentric ring of the sparking plug' outside, the intersection of the two flows has a distance from the air inlet disc, which makes the sparking plug lighting easier and the air inlet disc not burning-out because of the high temperature.

The invention discloses a connector detecting device. The connector detecting device comprises a controller, a power supply managing system, a warning indication system, a first connector and a second connector. The power supply managing system and the warning indication system are respectively connected with the controller, the first connector is connected with the second connector through a difference detecting line ADC P, the second connector is connected with the controller through a difference detecting line ADC N, and the power supply managing system is electrically connected with the first connector. Therefore, contact resistance between the connectors can be indirectly detected by detecting pressure difference between the difference detecting line ADC P and the difference detecting line ADC N, accordingly abnormal contact of the connectors in the using process can be ensured to be detected, the connectors are protected and prevented from being burned out due to poor contact in the frequent using process, and safety of large-current connectors is ensured. In addition, the invention further discloses a connector detecting method. The connector detecting method has same effect.

The invention discloses a speed controllable winding machine of motor coils. The speed controllable winding machine of the motor coils comprises a working platform, a winding spindle, a winding former, a driving device, a spindle transmission device and a counter. A spindle support is fixedly arranged on the working platform. The counter is installed on the spindle support. The winding spindle is connected on the spindle support in a shaft mode. The winding former is arranged on the winding spindle in a coaxial mode. The speed controllable winding machine of the motor coils is characterized in that a friction force regulating mechanism is arranged between the driving device and the spindle transmission device. The speed controllable winding machine of the motor coils has the advantages that the friction force regulating mechanism is arranged between the driving device and the spindle transmission device, the spindle driving device is controlled to drive through the friction force regulating mechanism, and a driving torque is controlled through the friction force regulating mechanism, thus the winding spindle is controlled to rotate and rotate speeds, the winding speeds are changed or the winding stops according to needs at any time, and the speed controllable winding machine of the motor coils is flexible and changeable to use. In addition, the whole device is simple in structure, convenient to process, convenient to manufacture and low in cost.

The invention discloses a rotary type water-cooled fire grate, which comprises a drive device, an installation frame, a plurality of large rotary discharge pipes and small fixed tier poles, wherein the large rotary discharge pipes are arranged on the installation frame in parallel at intervals; one small fixed tier pole is arranged between each two adjacent large rotary discharge pipes; the drive device is connected with all the large rotary discharge pipes through transmission components. The rotary type water-cooled fire grate is ingenious and reasonable in structural design; the large rotary discharge pipes are arranged in parallel at intervals, and one small fixed tier pole capable of forming a certain barrier is arranged between each two adjacent large rotary discharge pipes, so that air leakage can be prevented, fuel can be fully combusted, meanwhile, wind energy can be utilized maximally, the large rotary discharge pipes are linked synchronously, the deslagging effect is good, and the application range is wide; in addition, water cooling is adopted for protection, the service life is long, and the rotary speed and the working time of a motor can be controlled through a controller, so that the rotary type water-cooled fire grate can meet the work requirements under different conditions, is simple, easy and convenient to operate, is high in degree of automation, and is beneficial to be popularized and applied widely.

The invention discloses a subsonic-speed ladle cover ablation test device under high-entropy condition. The device comprises a ladle cover spraying pipe, a throat way support rod, a transfer flange, atransfer section and a model bracket. The ladle cover spraying pipe and the model bracket are fixed on the transfer flange. The throat way support rod is connected with the model bracket by the transfer section; and a throat way part of the throat way support rod is positioned in the ladle cover spraying pipe. The overlap with the center axis of the ladle cover spraying pipe is guaranteed throughconnection between the throat way support rod and the transfer section. During testing, a test model is mounted on the throat way support rod, an annular channel between the outer surface of the testmodel and the inner surface of the ladle cover spraying pipe is a high-entropy airflow channel, and the flowing of air currents in the ladle cover spraying pipe is subsonic-speed flowing. The devicecan be applied to aerospace pneumatic thermal protection ground simulation tests in high-entropy airflow state.

The invention discloses a flame detector cooling device which comprises a flame detector probe (1), a cooling air blow-off nozzle (2) of the flame detector probe, an outer cooling tube (3), an optical fiber (4) and an inner cooling tube (5). The flame detector cooling device is characterized in that the flame detector probe (1) is arranged in the outer cooling tube (3); the inner cooling tube (5) is sleeved in the outer cooling tube (3); and the optical fiber (4) is arranged in the inner cooling tube (5), one end of the optical fiber (4) is connected to the flame detector probe (1) while the other end of the optical fiber is connected to an external system, and a flame detecting optical fiber protecting pipe is changed from a single-layered cooling air duct into a double-layered cooling air duct, so that problems that the optical fiber is easy to damage, the flame detecting probe is easy to clog and the like are solved.

The invention relates to a basalt fiber-containing protective suit, which comprises a fabric, a lining and a middle stuffing, flame-retardant terylene fibers, glass fibers and basalt fibers are blended to form the fabric, continuous basalt fibers are woven to form the lining, and the middle stuffing is basalt fiber stuffing. The basalt fiber-containing protective suit can resist acid, alkali, high temperature and low temperature, moreover, moisture absorption is good, the basalt fiber-containing protective suit can absorb sweat produced by the human body, and thereby the basalt fiber-containing protective suit can provide a clean, comfortable environment for a user.

The invention discloses a red kiwi tree cultivation method, and belongs to the technical field of fruit tree planting. The method includes the following steps of A, conducting soil preparation, wherein organic fertilizer is applied deep into an orchard, drainage ditches are formed, and the fertilizer application amount is 2 tons per mu; B, selecting seedlings, wherein grafting fruit seedlings are selected for standby application; C, digging pits and applying base fertilizer, wherein the planting pits are dug in the orchard, and soil and the base fertilizer are mixed and put into the planting pits to form tree disks; D, conducting field planting, wherein pits are dug in the tops of the tree disks, fruit seedlings are planted in the pits, soil around root systems is treaded, 2.5 kilograms of root fixing water are sprayed in the soil along trunks, an annular ridge is manufactured around each pit, the tree disks are covered with mulching films, the fruit seedlings penetrate through small holes in the centers of the mulching films, and the edges of the films are uniformly embedded in the soil; E, conducting orchard management, wherein daily irrigation, topdressing, pest control and prevention, shelf erecting and trimming, and flower and fruit management are conducted on the fruit seedlings; F, conducting harvesting when fruits are properly mature. The method can solve the problems that traditional red wiki trees are low in growth speed, low in fruit setting rate and high in later-period management and protection cost.

The invention relates to an electric heating hand warmer with a ceramic electric heating substrate. The electric heating hand warmer comprises a bag body and an electric heating body disposed in the bag body. The electric heating hand warmer is characterized in that the electric heating body is the ceramic electric heating substrate serially connected with an overheat protector. By using the ceramic electric heating substrate as the electric heating body with the serially connected overheat protector, the electric heating hand warmer is simple and reasonable in structure and fast in heating, heating conditions of the ceramic electric heating substrate can be monitored by the overheat protector in real time, when dry heating due to the ceramic electric heating substrate exposes out of liquids occurs, power-off protection is performed by the overheat protector, dry heating is avoided, and accordingly the electric heating hand warmer is safe, reliable and long in service life. In addition, the novel heating body is high in heating efficiency, electricity-saving and environment-friendly, and sustainable development of industrialization is benefited.

The contactor includes case, quenching pot, electromagnetism gear inside case. The electromagnetism gear is composed of dynamic iron core, static iron core and magnet coil. Contact gear including dynamic contact, static contact and assistant contact is above the case. Characters are that magnet steel of permanent magnetism is setup on dynamic iron core. impulse current in 0.2 second completes function of contactor without consuming maintenance current so as to save energy more than 99%. Features of the disclosed contactor are: no heat generation from electromagnetism coil, quick detaching contacts, strong arc extinguishing capability, small contact resistance and 12000 gauss high magnetism density.