43results about How to "Close performance stable" patented technology

The invention provides an arc extinguish chamber and a circuit breaker employing the same. The circuit breaker comprises the arc extinguish chamber and an operating mechanism, wherein the arc extinguish chamber comprises a first contact and a second contact; the second contact is provided with a moving end conducting rod; the operating mechanism is in direct transmission connection with the moving end conducting rod; and the first contact is a floating contact arranged through an elastic part. The arc extinguish chamber and the circuit breaker have the beneficial effects that the operating mechanism is in direct transmission connection with the moving end conducting rod, so that an insulated pull rod can be omitted; the weight of a moving component is reduced; and improvement of the breaking-closing speed is facilitated. The first contact is the floating contact, so that the second contact can push the first contact to further move a distance after being closed; certain bonding pressure can be kept between the two contacts after the elastic part is compressed; good closing performance is ensured; the influence on the closing performance since an overrun spring cannot be arranged after the insulated pull rod is directly removed is avoided; meanwhile, the second contact can obtain breaking initial kinetic energy through the elastic part; and the breaking speed is improved.

The invention discloses an operating mechanism used for a three-station switch. The operating mechanism comprises partition plates, an output main shaft, a drive mechanism and a limiting mechanism, wherein the drive mechanism controls rotation of the output main shaft so that an output shaft connecting lever on the output main shaft can swing between the isolation station, the grounding station and the switch-on station, the drive mechanism comprises an operating main shaft, a grounding main shaft and a switch-on main shaft, and the operating main shaft drives the grounding main shaft and the switch-on main shaft so as to drive the output main shaft to rotate to the grounding position and the switch-on position. One end of the grounding main shaft and one end of the switch-on main shaft are respectively provided with a connecting lever and a spring, wherein the connecting levers and the springs can drive the output main shaft to rotate rapidly, and the limiting mechanism locks the output shaft connecting lever located in the isolation station or the grounding station or the switch-on station. The operating mechanism used for the three-station switch has good switching-on performance, the output main shaft can be accurately limited in the isolation position or the grounding position or the switch-on position, abrasion among all parts can be reduced, and the mechanical service life of limiting parts can be prolonged to the maximum.

The invention discloses a vibration reducer and a switching device. The vibration reducer comprises a cylinder, a piston, a piston rod and a pressure relieving device, wherein one end of the piston rod penetrates through a first end cover, and extends into the cylinder to be fixed with the piston in the cylinder; a cavity of the cylinder is divided into a first cavity and a second cavity at the sides of the first end cover by the piston; the pressure relieving device is assembled on the cylinder, and a valve core rod part of a pressure relieving valve rod in the pressure relieving device extends into the first cavity; an extension rod is positioned in the pressure relieving valve core for adjusting a pressure relieving trigger travel; a first limiting mechanism is arranged between the extension rod and the pressure relieving valve core; and the pressure relieving device and the second cavity are communicated through a channel provided with an adjusting valve. The switching device comprises a single-pole switch; the single-pole switch is axially connected with the vibration reducer; when the switch is switched on, the damping is relieved at the tail section of the moving contact travel, so that the switching-on bounce of a moving contact of the switching device accelerated by the damping force is prevented, and the switching-on time is shortened; the damping releasing strength is adjusted; and the vibration reducer and the switching device are in synergistic effect to optimize the switching-on performance.

The invention discloses a damping shock absorber and a switch device. The damping shock absorber comprises a cylinder body, a piston, a piston rod and a pressure relief device. One end of the piston rod penetrates a first end cover and extends into the cylinder body to be fixed to the piston in the cylinder body. The cylinder body is separated into a first cavity located in one side of the first end cover and a second cavity through the piston. The pressure relief device is assembled to the cylinder body. The valve element rod portion of a pressure relief valve element arranged in the pressure relief device extends to the first cavity. A telescopic rod is arranged in the pressure relief valve element. The pressure relief device is provided with an adjusting channel so that the extension length of the telescopic rod can be adjusted conveniently. The pressure relief device is communicated with the second cavity through a channel with a control valve. The switch device comprises a single-pole switch connected with the shock absorber in the axial direction. When the switch is switched on, in the last stage of the moving contact stroke, damping is released through the shock absorber, it is avoided that the switch moving contact switch-on bouncing is promoted through the damping force, and the switch-on time is shortened; and the strength of damping release is adjusted, the damping shock absorber and the switch device act in a synergistic manner, and switch-on performance is optimized.

The invention discloses a buffer device and a mechanical switch. The device comprises a cylinder, a piston, a piston rod and a pressure relieving device, wherein one end of the piston rod penetrates through a first end cover, and extends into the cylinder to be fixed with the piston in the cylinder; a cavity of the cylinder is divided into a first cavity and a second cavity at the sides of the first end cover by the piston; the pressure relieving device is assembled on the cylinder, and a valve core rod part of a pressure relieving valve rod in the pressure relieving device extends into the first cavity; an extension rod is positioned in the pressure relieving valve core for adjusting a pressure relieving trigger travel; and the pressure relieving device and the second cavity are communicated through a channel provided with an adjusting valve. The mechanical switch comprises a single-pole switch; the single-pole switch is axially connected with the buffer device; the buffer device relieves the damping force before switching on; the switching-on bounce of a moving contact is reduced; the damping releasing strength is adjusted; and the buffer device and the mechanical switch are in synergistic effect to optimize the switching-on performance. The pressure relieving device is arranged on the cylinder, and is convenient for installation, maintenance and adjustment of the pressure relieving trigger travel of the pressure relieving valve core.

The invention discloses a vibration damping device and switch equipment. The device comprises a cylinder, a piston, a piston rod and a pressure relief device. One end of the piston rod penetrates a first end cover and stretches into the cylinder, and the piston rod and the piston in the cylinder are fixed. An inner chamber of the cylinder is divided by the piston into a first chamber and a second chamber which are located on the side of the first end cover. The pressure relief device is assembled on the cylinder. A valve element rod of a pressure relief valve element arranged in the pressure relief device extends into the first chamber. A telescopic rod is arranged in the pressure relief valve element and used for adjusting the pressure relief trigger stroke. A first limiting mechanism for preventing the telescopic rod and the pressure relief valve element from relatively rotating is arranged between the telescopic rod and the pressure relief valve element. The switch equipment comprises a single-pole switch axially connected with the above vibration damping device. In the switch-on process of the switch, damping is relieved through the vibration damping device at the stroke tail segment of a movable contact, the situation that damping force promotes switch-on bouncing of the movable contact is avoided, and the switch-on performance is improved. The pressure relief device is arranged on the cylinder, and mounting, adjusting, maintaining and adjusting of the pressure relief trigger stroke are facilitated.

The invention provides a switch-on indicating isolation switch. The switch-on indicating isolation switch comprises a base, a moving contact and a static contact which are mounted on the base, and also comprises a disconnecting link, wherein one end of the disconnecting link is hinged with the moving contact while an insulating operating ring is fixed at the other end of the disconnecting link; a conductive sheet is transversely fixed on one side of the operating insulating ring; the base is provided with a power supply, an indicator lamp, a time-delay switch and a group of conductive contacts which are arranged at intervals; and the conducive sheet, the power supply, the indicator lamp, the time-delay switch and the group of conductive contacts form an indicating loop. The switch-on indicating isolation switch has the advantages of scientific design, high practicability, simple operation, capability of monitoring a switch-on state, and good switch-on effect.

The invention belongs to the field of switches, and particularly discloses a medium and high voltage switch device. The medium and high voltage switch device comprises a base frame and a switch unit for fixing the base frame. The switch unit comprises a vacuum bubble, an insulating cylinder, an electromagnetic driver and a debouncing device which are axially connected. The debouncing device comprises a cylinder body, a piston, a drainage device and a reverse-blocking device. The drainage device is arranged in the first end cover at the side of a rod cavity, and is distributed in the axial direction; a triggering discharge rod of the drainage device protrudes out of the lower end surface of the first end cover and extends into the rod cavity. The reverse-blocking device is arranged in the first end cover and is arranged in the radial direction. The rod cavity, the drainage device, the reverse-blocking device and a rodless cavity are communicated in sequence. When the switch device is switched on, the piston impacts the triggering discharge rod to trigger the discharge device and the reverse-blocking device for drainage, so as to eliminate the driving force for enabling a moving contact of the switch device to bounce back at the tail end of the stroke; and the reversing-blocking device is immediately reset and blocked for circulation after the switch device is switched off, and the debouncing device further absorbs energy of backward bouncing of the moving contact after switching off, so that jumping arcing when the switch device is switched off is avoided effectively.

The invention discloses an energy consumer and a mechanical switch. The energy consumer comprises a cylinder, a piston, a piston rod, an adjusting valve, a channel and a pressure relieving device, wherein the cylinder comprises a first end cover, a cylinder barrel and a second end cover; the piston rod penetrates through the first end cover, and is fixed together with the piston in the cylinder; the cylinder is divided into a first cavity and a second cavity at the side with the first end cover by the piston; one end part of a pressure relieving valve core positioned in the pressure relieving device assembled on the cylinder extends into the first cavity; the channel is communicated with the pressure relieving device and the second cavity; and the adjusting valve is arranged on the channel. The mechanical switch comprises a single-pole switch and the energy consumer axially connected to each other; when the switch is switched on, the energy consumer relieves the damping at the tail section of the travel thereof, and the switching-on bounce, caused by the damping force, of a moving contact is reduced; the damping relieving strength is adjusted by adjusting the openness of the adjusting valve, so that moving parts of the energy consumer and the mechanical switch are in synergistic effect to optimize the switching-on performance; and the pressure relieving device is arranged on the cylinder of the energy consumer, and is convenient for installation, maintenance and replacement of the pressure relieving valve core.

The present invention discloses a vibration damping device and a disconnector. The device comprises a cylinder, a piston, a piston rod and a pressure relief device. The cylinder comprises a first end cover, a cylindrical barrel and a second end cover. One end of the piston rod passes through the first end and stretches into the inside of the cylinder to be fixed with the piston within the cylinder. The piston divides the cylinder into a first chamber and a second chamber on the first end cover side. The pressure relief device is assembled on the cylinder. A valve plug rod of a built-in pressure relief valve plug extends to the first chamber. A telescopic rod is disposed inside the pressure relief valve plug. The pressure relief device is provided with an adjusting channel suitable for adjusting the stretching length of the telescopic rod. The disconnector comprises a single pole switch that is connected with the above-mentioned vibration damping device in an axial direction. When the switch is closed, in the last stage of the moving contact travel, the vibration damping device relieves damping to avoid that the damping force facilitates the moving contact of the disconnector to close and bounce, thereby shortening the closing time. The pressure relief device is disposed on the cylinder of the vibration damping device, which is convenient for installing, maintaining and replacing the pressure relief valve plug.

The present invention provides an immobilized and encapsulated post terminal and a breaker provided with the immobilized and encapsulated post terminal. The breaker comprises the immobilized and encapsulated post terminal and an operating mechanism. The immobilized and encapsulated post terminal comprises a first contact and a second contact. The second contact is provided with a movable-end conductive rod. The operating mechanism is directly in transmission connection with the movable-end conductive rod. The first contact is in the form of a floating contact arranged by an elastic piece. According to the technical scheme of the invention, the operating mechanism is directly in transmission connection with the movable-end conductive rod. In this way, no insulated pull bar is adopted, and the weight of moving parts is reduced. The breaking-closing speed is improved. The first contact is in the form of the floating contact. Therefore, after the closing process, the second contact can push the first contact to move continuously. The elastic piece keeps a certain engagement pressure between the two contacts after being compressed, so that the closing performance is ensured to be good. The condition that the closing performance is affected due to the absence of an over-travel spring after the direct removal of the insulated pull bar can be avoided. Meanwhile, the elastic piece supplies an initial kinetic energy for the breaking of the second contact, so that the breaking speed is improved.

The invention discloses a switch contact structure for a closing switch. The switch contact structure comprises a pair of movable contact pieces and a static contact which can be positioned between the movable contact pieces, wherein the left and right sides of the static contact are provided with a pair of auxiliary contact points made of a copper-chromium alloy material; the inner sides of the two movable contact pieces are provided with main contact points which are formed oppositely; and auxiliary contact pieces which are made of the copper-chromium alloy material and are matched with the auxiliary contact points are arranged at the upper ends of the main contact points. After the structure is adopted, during switching on, the auxiliary contact points are contacted with the static contacts prior to the main contact points, so that burning of the contacts caused by electric arc can be avoided, the advantages of ablation resistance of the auxiliary contact points and the auxiliary contact pieces made of the copper-chromium alloy with high melting point are fully utilized, the copper static contacts and movable contact pieces with high conducting performance but lower melting points are indirectly protected from being burnt, the aims of increasing the switching-on / off times and improving the switching-on / off capability are fulfilled effectively, and the service life of an entire switch is prolonged.

A permanent magnet linear thrust operating mechanism used for a vacuum circuit breaker belongs to the technical field of vacuum circuit breaker operating mechanisms. The permanent magnet linear thrust operating mechanism is formed by connecting a four-bar linkage with the moving contact of the vacuum circuit breaker; a main permanent magnet and an auxiliary permanent magnet are arranged on the inner wall of a primary core of the permanent magnet linear thrust operating mechanism; the holding of the circuit breaker in a switching / closing position is achieved through the auxiliary permanent magnet; and the permanent magnet linear thrust operating mechanism comprises an armature winding, a secondary core, the primary core, the auxiliary permanent magnet, a transmission rod, a magnetism isolating material and the main permanent magnet. The permanent magnet linear thrust operating mechanism reduces the complex structure of a motor, has a small mass and a high speed, and decreases useless work; and by arranging the auxiliary permanent magnet, the hold function is achieved.

The invention discloses a vibration remover and a circuit breaker. The vibration remover comprises a cylinder, a piston, a piston rod and a pressure relief device. One end of the piston rod penetrates a first end cover, stretches into the cylinder and is fixed with the piston in the cylinder. The cylinder is divided by the piston into a first chamber and a second chamber which are located on the side of the first end cover. The pressure relief device is assembled on the cylinder. A valve element rod of a pressure relief valve element arranged in the pressure relief device extends towards the first chamber. A telescopic rod is arranged in the pressure relief valve element. The pressure relief device is provided with an adjusting channel enabling the length of the stretching part of the telescopic rod to be conveniently adjusted. A limiting mechanism is arranged between the telescopic rod and the pressure relief valve element. The pressure relief device and the second chamber are communicated through a channel with an adjusting valve. The circuit breaker comprises a single-pole switch axially connected with the vibration remover. In the switch-on process, damping is relieved through the vibration remover at the stroke tail segment of a movable contact of the circuit breaker, the situation that damping force promotes switch-on bouncing of the movable contact is avoided, and switch-on time is shortened. The intensity of damping relieving is adjusted, the vibration remover and the circuit breaker synergistically act, and the switch-on performance is optimized.

The invention provides an in-place monitoring method for a knife switch of an isolation switch. The in-place monitoring method involves the following device for implementing the monitoring method. Thedevice comprises a base, a movable contact and a static contact and also comprises the knife switch and a positioning sliding way, wherein the movable contact and the static contact are arranged on the base, the positioning sliding way is fixed on the base, one end of the knife switch is hinged with the movable contact, an insulation positioning plate is fixedly arranged at the other end of the knife switch, an operating ring is arranged at an outer side of the insulation positioning plate, guide rods are respectively hinged with two sides of the insulation positioning plate, the positioningsliding way is perpendicular to the static contact and is arranged at an outer side of the static contact, a positioning groove is formed in a middle part of the positioning sliding way and is corresponding to the insulation positioning plate, the bottoms of the guide rods are arranged in the positioning sliding way in a sliding way, and a fixed clamping buckle is arranged on the base and is corresponding to the operating ring. The in-place monitoring method for the knife switch of the isolation switch has the advantages of scientific design, high practicability, good closing effect and long service lifetime of the knife switch and is convenient to operate.

The invention provides a rapid-switch bistable state magnetic operating mechanism, and the operating mechanism comprises a moving core, a solenoid coil, permanent magnets, and a housing. The housing is a cylindrical housing, and the solenoid coil is disposed between a side surface of the moving coil and the housing. The permanent magnets comprise an upper permanent magnet and a lower permanent magnet, which are respectively disposed above and below the moving coil and have the opposite polarities. The magnetic core is provided with a guide column which is coaxial with the magnetic core. A switch can achieve the dual-holding and bistable state through the two permanent magnets when the switch is in any one state of switching-on or switching-off, thereby ironing out the defects that a conventional monostable permanent magnet mechanism is weak in holding force in a vacuum extinction chamber when the conventional monostable permanent magnet mechanism is in a switching-on or switching-off,and improving the overall reliability and stability of a rapid switch. Moreover, a spring tension structure in the conventional operating mechanism is simplified, and the switching performance of theswitch is greatly improved, wherein the switching-on time can be within 3ms. The mechanism has the good performances of high-speed switching and bistable state, and can achieve the electric switchingfunction through just changing the current direction of a coil.

The invention belongs to the field of power distribution equipment, and particularly discloses an anti-condensation power distribution cabinet, which comprises a closed cabinet body, a condensation removal chamber, a circulating pump and a condensation removal device, wherein a bus compartment, a cable compartment, a circuit breaker compartment and a control compartment are arranged in the cabinetbody, the circuit breaker compartment, the bus compartment, the cable compartment and the condensation removal chamber are communicated in sequence, the input port of the circulating pump is communicated with the output port of the condensation removal chamber, the output port of the circulating pump is communicated with the input port of the circuit breaker compartment, the condensation removaldevice is composed of a compressor, a condenser, a storage tank, a throttle valve and an evaporator which are sequentially communicated, the evaporator is assembled in the condensation removal chamber, a refrigerant medium is arranged in the storage tank, the evaporator and the throttle valve are communicated through a first pipeline, the evaporator and the compressor are communicated through a second pipeline, and the first pipeline and the second pipeline penetrate through the side wall of the condensation removal chamber respectively and are matched in a sealed mode. According to the invention, a dry environment is kept in a power distribution cabinet, no condensation is formed, the insulation creepage distance is increased, short-circuit tripping is avoided, and the power distributioncabinet operates stably and safely.

The invention discloses an electrical structure for improving the rated short circuit current closing ability of a load switch. The electrical structure comprises a load switch electromagnetic mechanism control circuit. In the circuit, a closing coil is connected in series between the anode and cathode of a power supply and is internally provided with a moving core, a moving bracket and the moving core are arranged with an interval, the moving bracket is orderly connected to a closing rotation shaft, a connection rod and a vacuum arc extinguish chamber contact moving end. A spring sleeves the connection rod between the closing rotation shaft and a moving contact. A capacitor is connected between the anode and cathode of the power supply and is used for storing energy which is used for indirectly increasing the magnetic field of the closing coil in a closing moment. A magnetized moving core is in a magnetic connection with the moving bracket, and the moving bracket, the closing rotation shaft and a vacuum arc extinguish chamber moving contact are driven to be in linkage. According to the electrical structure, through adding corresponding electric components into an electromagnetic mechanism secondary circuit of the load switch, in the moment of energization and the closing of moving and static cores, the closing coil is assisted to generate power to drive the moving contact to move to close.

The invention relates to a valve (100, 101) comprising a housing (110, 111), an annular sealing element (140, 146), and a displaceable closure element (170), wherein the sealing element (140, 146) and the closure element (170) are disposed within the housing (110, 111), and wherein the valve (100, 101) can be closed by placing the closure element (170) against the sealing element (140, 146). The valve (100, 101) is characterized by a hollow space (131, 132) in the region of an outer side of the sealing element (140, 146), in which a part (143, 144) of the sealing element (140, 146) can be received during thermal expansion. The invention further relates to another valve (102) in which the annular sealing element is an O-ring (150).

The invention belongs to the field of power distribution devices and specifically discloses a complete power distribution device, comprising a cabinet frame and a bus bar compartment, a cable compartment, a circuit breaker compartment and a control compartment, which are disposed in the cabinet frame and formed by metal partition boards. The circuit breaker compartment is provided with a built-incircuit breaker, and the circuit breaker is equipped with an axially fixedly connected vacuum bubble, an insulating cylinder, an electromagnetic actuator and an anti-ballistic device. The anti-ballistic device comprises a cylinder body and a piston built in the cylinder body; the side wall of the cylinder body is provided with a drainage device, a damping device and a drainage hole for connectingthe drainage device, the damping device and a rodless cavity. When the power distribution device is switched on, the anti-ballistic device absorbs part of the energy of a moving contact of the circuitbreaker before switch-on, and the piston acts to the drainage device to trigger the drainage device to drain, and the driving force for driving the moving contact to reversely bounce after being switched on is eliminated; the damping device allows a damping medium to flow into a rod cavity only through a damping hole in the piston, and the anti-ballistic device absorbs the energy of reverse bounce of the moving contact, thereby effectively suppressing the occurrence of switch-on bounce of the moving contact and avoiding the occurrence of switch-on bounce arcing.

The invention belongs to the field of switch cabinets, and particularly discloses a power switch cabinet which comprises a cable compartment, a bus compartment, a circuit breaker compartment and a control compartment. A bus copper bar, an inlet wire contact box, an outlet wire contact box and a current transformer are arranged in the bus compartment. A first handcart and a circuit breaker are arranged in the circuit breaker compartment, the first handcart is assembled with the circuit breaker compartment through a first guide rail, the circuit breaker is fixed on the first handcart, an inlet wire contact of the circuit breaker is matched with the inlet wire contact box, and an outlet wire contact of the circuit breaker is matched with the outlet wire contact box. An opening and closing mechanism is arranged in the circuit breaker, and the opening and closing mechanism is composed of an elastic blocking device, an electromagnetic driver, an insulating cylinder and a vacuum bubble whichare fixedly connected in the axial direction. A controller is arranged in the control compartment and electrically connected with the electromagnetic driver and the current transformer. The elastic blocking device absorbs part of energy of the opening and closing mechanism before closing, inhibits closing bounce of the moving contact of the circuit breaker, avoids closing bounce arcing and explosion caused by arcing, and improves closing performance and safety of the switch cabinet.

The invention belongs to the field of switch equipment, and particularly discloses a switch cabinet suitable for preventing burning explosion. The switch cabinet comprises a cabinet body, a thermal control chamber and a thermal control system; the cabinet body is of a closed structure formed by a cabinet door, a left side plate and a right side plate; the thermal control system comprises a circulating pump arranged in the thermal control chamber, a first heat exchanger arranged in the bus compartment and suitable for heat absorption, a second heat exchanger arranged in the cable compartment and suitable for heat absorption, a third heat exchanger arranged in the circuit breaker compartment and suitable for heat absorption, and a fourth heat exchanger arranged outside the cabinet body and suitable for heat dissipation. The thermal control system is suitable for timely discharging the heat generated in the cabinet body out of the cabinet, reducing the temperature in the cabinet and ensuring the normal operation of the switch cabinet. The internal space and the external space of the switch cabinet are isolated by the closed cabinet body, so the open fire generated in the cabinet is limited in the cabinet body and cannot influence the outside of the cabinet, the switch cabinet is suitable for places containing combustible gas and combustible dust, burning explosion accidents are avoided, and orderly production is facilitated.

The invention discloses a buffer and a mechanical switch. The buffer comprises a cylinder, a piston, a piston rod and a pressure relieving device, wherein the cylinder comprises a first end cover, a cylinder barrel and a second end cover; one end of the piston rod penetrates through the first end cover, and extends into the cylinder to be fixed together with the piston in the cylinder; a cavity of the cylinder is divided into a first cavity and a second cavity at the side with the first end cover by the piston; the pressure relieving device is assembled on the cylinder, and a valve core rod part of a pressure relieving valve rod in the pressure relieving device extends into the first cavity; and a telescopic rod is positioned in the pressure relieving valve core for adjusting a pressure relieving trigger travel. The mechanical switch comprises a single-pole switch; the single-pole switch is axially connected with the buffer; and when the switch is switched on, the buffer relieves the damping force at the tail section of a vacuum foam moving contact travel, the switching-on bounce, caused by the damping force, of a moving contact of the mechanical switch is prevented, and the switching-on performance is improved. The pressure relieving device is arranged on the cylinder of the buffer, and is convenient for installation, debugging, maintenance and replacement of the pressure relieving valve core.

The invention discloses a vacuum contactor for wind power generation. The vacuum contactor comprises a rear substrate and a front substrate. An auxiliary switch, a static armature plate and a secondary power module are fixed on the inner side face of the rear substrate. A static iron core and a coil which are configured according to a proportion of 1:1 among vacuum switch tubes, the static iron core and the coil are mounted on the static armature plate. A moving armature plate is located between the static armature plate and the front substrate, a separating brake spring is located between the moving armature plate and the static armature plate, a plate playing screw is arranged in the inner side of the upper edge of the moving armature plate, and one end of the auxiliary switch is provided with a contact. A static coil out row and a moving coil out row are respectively fixed on the upper edge and the lower edge of the outer surface of the front substrate. The vacuum switch tubes are arranged between the static coil out row and the moving coil out row, and static conducting rods and moving conducting rods of the vacuum switch tubes are respectively connected with the static coil out row and the moving coil out row. A rotating shaft is arranged below the moving armature plate. A crank arm is arranged between the rotating shaft and the moving conducting rods in a connection mode. Two vacuum switch tubes are in parallel connection with each electrode between the static coil out row and the moving coil out row. The vacuum contactor is not only large in working currents and wide in application range, but also stable in switching in performance and good in quality, and especially suitable for being used on wind driven generators.

A coal storage silo feeding device comprises automatic air locking funnel devices 3 arranged on the top of a silo and a sealed spiral feeding device body 5. The automatic air locking funnel devices are arranged on the two sides of a conveying belt for conveying materials to the coal storage silo, and the sealed spiral feeding device body of the coal storage silo feeding device is arranged below a roller end of the conveying belt for conveying materials to the top of the coal storage silo. The feeding device has the functions of protecting the materials in the silo and sealing the silo at the same time, and air in the silo can be discharged through the feeding device.

The invention belongs to the field of switch cabinets, and particularly discloses a medium and high voltage switch cabinet, comprising a cable compartment, a busbar compartment, a circuit breaker compartment and a control compartment. A circuit breaker, an incoming line contact box and an outgoing line contact box are built in the circuit breaker compartment. A switch-on and switch-off mechanism is built in the circuit breaker, and the switch-on and switch-off is composed of an anti-bounce device, an electromagnetic driver, an insulating cylinder and a vacuum bubble, which are fixedly connected with each other on the axial direction. A piston of the anti-bounce device is provided with a damping hole, and an electric drainage device and a current blocking device, which communicate with eachother, the electric drainage device is triggered to perform electric drainage during switch-on to eliminate the promotion force of switch-on bounce of a moving contact of the circuit breaker, and thecurrent blocking device ensures that a damping medium flowing through the electric drainage device can only flow to a rodless cavity, so that the anti-bounce device absorbs the energy of the reversebounce of the moving contact. The anti-bounce device absorbs a part of energy during the switch-on of the moving contact of the circuit breaker, eliminates the promotion force for prompting the switch-on bounce and absorbs the bounce energy of the moving contact, so as to suppress the switch-on bounce of the moving contact of the circuit breaker, thereby avoiding the occurrence of switch-on bouncearcing.

A valve structure of needle valve for carburetor relating to the improvement for structures of valve seat and piston in needle valve includes to set big hole and small hole which are connected through to each other on valve body, to erect valve seat made of rubber material in big hole, to erect valve stem in big hole with its one end being cooperated by cone piston and valve seat and the valve stem will be a copper processed piece. The needle valve designed by this invention has solved the problems of complication in fabricating the structural components to make copper sheathed valve seat and rubber cone piston mate to each other, high off-specification rate caused by difficult matching of structure so as to achieve the aim of low cost in production and simplicity in fabrication.

The invention discloses an operating mechanism used for a three-station switch. The operating mechanism comprises partition plates, an output main shaft, a drive mechanism and a limiting mechanism, wherein the drive mechanism controls rotation of the output main shaft so that an output shaft connecting lever on the output main shaft can swing between the isolation station, the grounding station and the switch-on station, the drive mechanism comprises an operating main shaft, a grounding main shaft and a switch-on main shaft, and the operating main shaft drives the grounding main shaft and the switch-on main shaft so as to drive the output main shaft to rotate to the grounding position and the switch-on position. One end of the grounding main shaft and one end of the switch-on main shaft are respectively provided with a connecting lever and a spring, wherein the connecting levers and the springs can drive the output main shaft to rotate rapidly, and the limiting mechanism locks the output shaft connecting lever located in the isolation station or the grounding station or the switch-on station. The operating mechanism used for the three-station switch has good switching-on performance, the output main shaft can be accurately limited in the isolation position or the grounding position or the switch-on position, abrasion among all parts can be reduced, and the mechanical service life of limiting parts can be prolonged to the maximum.

The invention discloses a novel high-voltage switch on-off transmission device which comprises a main shaft and an insulating pull rod. A connecting lever is arranged on the main shaft. A sliding block is arranged at the outer end of the connecting lever. The insulating pull rod is provided with an insulating pull rod insert, and threads are arranged on the insulation pull rod insert. The insulating pull rod insert penetrates through a center hole in the sliding block. Fixing nuts are arranged at the positions, on the two sides of the sliding block, of the insulating pull rod insert, spindle noses are arranged at the two ends of the sliding block respectively, oblong holes are formed in the outer end of the connecting lever, and the spindle noses are inserted into the oblong holes. The sliding block is provided with threaded holes of a high-voltage switch mechanical property detection device. A guide plate is arranged on a side plate and provided with a guide hole. The end of the insulating pull rod insert is inserted into the guide hole. According to the novel high-voltage switch on-off transmission device, the over travel adjustment structure is simplified, the over travel adjustment precision is improved, the high-voltage switch on-off capability is improved, the service life of a vacuum arc-extinguishing chamber is prolonged, and the product cost is reduced to a certain extent.