295 results about "Vacuum interrupter" patented technology

The invention relates to the technical field of high-voltage electric appliance detection, in particular to a device and method for detecting the vacuum degree of a vacuum arc-extinguishing chamber, and the method comprises the steps: arranging a field emission cathode on one metal end cover of the vacuum arc-extinguishing chamber; an anode is arranged on the metal shielding cover close to the field emission cathode in the vacuum arc-extinguishing chamber; the high-voltage direct-current power supply is connected to the field emission cathode and the anode and is used for applying voltage to the electrodes so as to drive the field emission cathode to emit electron beams to impact the anode; the X-ray energy spectrum detector directly faces the anode, the X-ray energy spectrum detector is used for measuring bremsstrahlung X-ray energy spectrum generated when the electron beam impacts the anode, an electron emission source is actively arranged in the arc extinguish chamber, and the distribution of the X-ray energy spectrum generated by the electron emission source is measured. And high signal-to-noise ratio, high-precision and high-sensitivity vacuum degree quantitative detection is realized by utilizing the strong correlation between the energy spectrum form and the internal gas pressure.

The invention discloses a split and combined load switch which comprises a switch frame, a bus mounting shaft and an isolation rotating shaft are arranged on the switch frame, an isolation knife is fixed on the isolation rotating shaft, an electric conductor is mounted on the bus mounting shaft, the lower end of the electric conductor is connected with an isolation static contact, and a vacuum arc-extinguishing chamber is mounted in the middle of the electric conductor. A static conducting rod of the vacuum arc-extinguishing chamber is connected with the electric conductor, a supporting frame is fixed to a movable end cover of the vacuum arc-extinguishing chamber, a first supporting shaft is rotationally arranged on the supporting frame, a crank arm shifting piece matched with the isolation knife in a shifting mode is fixed to the first supporting shaft, the crank arm shifting piece is connected with a movable conducting rod in a flexible connection mode, and a pull rod is arranged on the movable conducting rod. A cam assembly is installed on the first supporting shaft and is in transmission cooperation with the pull rod to control opening and closing of the vacuum arc-extinguishing chamber. According to the invention, arc extinguishing operation can be carried out through the vacuum arc extinguishing chamber during switching on and switching off of the isolation knife, and the operation safety is improved.

The invention relates to the technical field of high-voltage switch equipment, in particular to a voltage-sharing shielding case structure inside a high-voltage-class vacuum arc-extinguishing chamber. A voltage-sharing shielding case structure inside a high-voltage-class vacuum arc-extinguishing chamber is characterized in that the vacuum arc-extinguishing chamber is formed by connecting four sections of porcelain shells from top to bottom, and a moving contact and a static contact are arranged inside the vacuum arc-extinguishing chamber; the outer side of the upper part of the moving contact side is sleeved with a moving contact side shielding cover, and the outer side of the lower part of the moving contact side is sleeved with a moving end shielding cover. The middle part of the static contact is a static contact side, the outer side of the lower part of the static contact side is sleeved with a static contact side shielding cover, and the outer side of the upper part of the static contact side is sleeved with a static end shielding cover; and a main shielding cover is sleeved outside the upper parts of the moving contact and the static contact. Compared with the prior art, the influence of the ground capacitance of the internal voltage-sharing shielding case on the potential bias is reduced, so that the voltage concentration phenomenon occurring when the vacuum arc-extinguishing chamber is applied to the circuit breaker is reduced to the greatest extent.

The application discloses a high-voltage vacuum arc-extinguishing chamber contact resistance and equivalent thermal analysis method, comprising the following steps: three-dimensional equivalent modeling of the high-voltage vacuum arc-extinguishing chamber; determining the number and position of the contact piece contact points; experimentally measuring the high-voltage vacuum arc-extinguishing chamber loop resistance and calculating the contact radius; establishing a conductive bridge, and obtaining a simulation loop resistance by an electromagnetic simulation software; adjusting the contact radius so that the simulation loop resistance is consistent with the experimental measurement result, and obtaining an adjusted conductive bridge; performing electromagnetic field-thermal field-airflow field two-way coupling simulation analysis based on the high-voltage vacuum arc-extinguishing chamber equivalent model of the adjusted conductive bridge, and obtaining the high-voltage vacuum arc-extinguishing chamber temperature rise distribution. The application can more accurately simulate the current constriction effect on the large-size high-voltage vacuum contact piece and more accurately simulate the high-voltage vacuum contact piece contact resistance.

The invention belongs to the field of switch equipment, and particularly relates to a solid-sealed polar pole with a built-in double-break isolating switch, a circuit breaker and switch equipment. The solid-sealed polar pole with the built-in isolating switch comprises an insulating pouring body provided with a containing cavity, a vacuum arc-extinguishing chamber, a transition conductive part and a wire outlet end conductive part are fixedly connected to the insulating pouring body, the movable end of the vacuum arc-extinguishing chamber is movably connected with the transition conductive part, and the transition conductive part and the wire outlet end conductive part are connected and disconnected through ascending and descending of an isolating knife in the containing cavity. The transition conductive piece and the wire outlet end conductive piece are arranged on the two sides of the containing cavity in parallel and opposite modes, the isolation knife is parallel to the axis of the transition conductive piece and the axis of the wire outlet end conductive piece, and the isolation knife is provided with a switching-on position which is in conduction contact with the transition conductive piece and the wire outlet end conductive piece at the same time and a switching-off position which is separated from the transition conductive piece and the wire outlet end conductive piece at the same time. And when the isolation knife is in the opening position, a gap exists between the isolation knife and the inner wall of the accommodating cavity. The circuit breaker and the switch equipment both comprise solid-sealed polar poles.

The invention discloses a double-vacuum fracture multifunctional outdoor pole-mounted switch, which comprises a switch body, an operating mechanism, a transmission mechanism, two vacuum arc-extinguishing chambers, a current transformer and a controller, and is characterized in that the two vacuum arc-extinguishing chambers comprise a first vacuum arc-extinguishing chamber and a second vacuum arc-extinguishing chamber; the first vacuum arc-extinguishing chamber and the second vacuum arc-extinguishing chamber are arranged on the two sides of the same pole in a series connection mode, the first vacuum arc-extinguishing chamber and the second vacuum arc-extinguishing chamber are arranged in series, a single-time breaking task is distributed to the two arc-extinguishing chambers, the short-circuit current breaking capacity is remarkably improved, the contact ablation risk is reduced, the service life of the switch is prolonged, and the service life of the switch is prolonged. The mechanical interlocking design of the manual operation unit and the electric operation unit ensures that emergency operation can still be carried out through a circuit breaker opening and closing handle when a power failure occurs or a control system breaks down, an isolation operation handle independently controls an isolation static contact through an isolation insulation pull rod, step-by-step operation of the circuit breaker and an isolation disconnecting link is achieved, the maintenance safety requirement is met, and the maintenance cost is reduced. And the mistaken touch risk is reduced.

The invention relates to a load transfer switch (1) for a load tap changer (2), comprising at least one vacuum interrupter (30), a handling element (50) which is mechanically connected to the vacuum interrupter (30) on a first end (51) and has a roller (53) on a second end (52), a handling body (10) which has a base body (11) and at least one cam (20), wherein the vacuum interrupter (30) is handled via the handling element (50) by the roller (53) being driven over the handling body (10), at least one part (21) of the cam (20) having a higher strength than the base body (11).

A contact for a vacuum interrupter of a low, medium or high-voltage switchgear includes a contact rod composed of a first electrically conductive material and extending along a longitudinal axis of the contact, and a contact piece composed of a second electrically conductive material and fastened to an end face of the contact rod. The contact rod and the contact piece are materially bonded to one another at a connecting face. At least one of the contact rod or the contact piece has a wall which delimits the connecting face, rises perpendicularly to the longitudinal axis and is disposed such that the contact piece and the contact rod are also force-lockingly connected to one another by a force acting transversely to the longitudinal axis between the contact piece and the contact rod. A production method for such a contact is also provided.

A system and method for point on wave closing of a switching device, where the close initiation point is selected so that a minor current loop is generated that minimizes the accumulated current during the closing operation. The method includes determining bounce characteristic of contacts in the switching device during the closing operation, identifying available close initiation points on a voltage wave for a voltage across the contacts, selecting one or two of the close initiation points on the voltage wave that minimizes the accumulation of current during the closing operation, and closing the switching device using the selected close initiation point.

The utility model discloses a performance detection device for a vacuum arc-extinguishing chamber, which comprises a supporting plate, a supporting plate and an insulation detection transformer, the supporting plate is arranged at the top of the supporting plate, the insulation detection transformer is arranged at the bottom of the supporting plate, the supporting plate is movably provided with a vertical clamping plate, the vertical clamping plate is provided with a horizontal slot, and the vertical clamping plate is provided with a horizontal slot. The top of the clamping plate is provided with a fastener which extends downwards into the slot, and the supporting plate is provided with a moving contact reciprocating pulling member which is located at the upper part of the supporting plate. The utility model belongs to the technical field of vacuum arc-extinguishing chamber performance detection devices, and particularly relates to a performance detection device for a vacuum arc-extinguishing chamber.

The invention relates to a method and system for detecting the vacuum degree of a vacuum arc-extinguishing chamber based on high-frequency discharge and spectral analysis, and the method comprises the steps: exciting the interior of the vacuum arc-extinguishing chamber to generate field emission current through a high-frequency electric field, and obtaining a high-frequency current peak value through the spectral analysis of the field emission current; the vacuum degree is determined according to a pre-constructed vacuum degree-high-frequency current peak value standard relation curve, a high-frequency power source is connected to a vacuum arc extinguish chamber, the output voltage of the high-frequency power source is gradually increased until a vacuum gap breaks down, the voltage waveform in the process is recorded, and the total current of a loop is calculated; calculating a capacitive current component by combining the equivalent capacitance of the loop; and selecting a stable current section between two dielectric breakdown events in the total current, intercepting a current peak signal in the section, and subtracting the capacitive current component from the total current corresponding to the peak signal to obtain the field emission current. Compared with the prior art, the method has the advantages of high sensitivity, simplicity and convenience in operation, accurate result and the like.

An intelligent sensing type primary and secondary fusion circuit breaker disclosed by the present invention comprises a circuit breaker body, the bottom of the circuit breaker body is provided with an installation assembly used for supporting, the installation assembly is internally provided with an intelligent sensing assembly, the circuit breaker body comprises a circuit breaking box body, and the top of the circuit breaking box body is fixedly provided with three three-phase pole columns. One side of each of the three three-phase poles is fixedly provided with a vacuum arc-extinguishing chamber; by breaking through the limitation of physical integration of traditional primary and secondary fusion equipment instead of function cooperation, full-link deep fusion is perceived, analyzed and controlled, a multi-dimensional synchronous perception network and an AI fault prediction model are matched, a protection mode is upgraded to initiative early warning from post-event tripping, the early warning accuracy is improved, and the method is adaptive to complex working conditions and weak communication scenes and has a wide application prospect. The fault detection time is shortened to a millisecond level, the fault isolation time is less than 30 seconds, the power supply recovery efficiency is improved compared with that of traditional equipment, the fault positioning precision is enhanced, and the manual inspection cost is greatly reduced.

The utility model relates to the technical field of vacuum arc extinguish chambers, in particular to a vacuum arc extinguish chamber shielding cylinder fixing structure which comprises a shell, a shielding cylinder and a plurality of movable parts, the shell is provided with a vacuum cavity, the cavity wall of the vacuum cavity is provided with a first protruding part, and the side wall of the shielding cylinder is provided with a second protruding part. The second protruding part abuts against one end of the first protruding part, and each movable part is in threaded connection with the shielding cylinder, extends out of the outer side wall of the shielding cylinder by a preset distance and abuts against the other end of the first protruding part. And the movable piece abuts against the first protruding part, so that the protrusion with the adjustable extending length is achieved, and the shielding cylinder is prevented from shaking and making abnormal sounds.

The utility model discloses a two-body vacuum arc-extinguishing outdoor grading ring comprising a first arc-shaped member and a second arc-shaped member, the first arc-shaped member and the second arc-shaped member are made of the same metal material, the inner side of the first arc-shaped member is provided with a first arc-shaped groove, the inner side of the second arc-shaped member is provided with a second arc-shaped groove, and the first arc-shaped groove and the second arc-shaped groove are made of metal materials. The first arc-shaped piece and the second arc-shaped piece are oppositely connected to form a complete circular ring, the first arc-shaped piece and the second arc-shaped piece are connected through screws, and the two ends of the first arc-shaped groove and the two ends of the second arc-shaped groove are connected to form a complete circular-ring-shaped groove. According to the utility model, the condition of non-uniform distribution of electric fields on the outer edge surface of the vacuum arc-extinguishing chamber is improved, and the flashover phenomenon on the edge surface in the aging process is reduced.

The utility model discloses an assembly tool for a vacuum arc extinguish chamber assembly of a pole-mounted circuit breaker, and belongs to the field of pole-mounted circuit breakers, the assembly tool comprises a base, a positioning assembly, a supporting assembly, a limiting assembly and a push-pull assembly, the positioning assembly is arranged on the base, the supporting assembly and the positioning assembly are correspondingly arranged at an interval, the limiting assembly is arranged on the push-pull assembly, and the push-pull assembly is arranged on the base. And the push-pull assembly is used for driving the vacuum arc-extinguishing chamber assembly to extend into or retreat from the insulating part. According to the utility model, the push-and-pull assembly drives the vacuum arc-extinguishing chamber assembly to extend into the conical inner cavity of the insulating part, and a worker does not need to push and pull the vacuum arc-extinguishing chamber assembly manually, so that the labor intensity of the worker is reduced, time and labor are saved, and the assembly efficiency is improved; through the supporting assembly, the vacuum arc-extinguishing chamber assembly and the insulating part automatically keep coaxial alignment, so that time waste caused by repeated adjustment of the vacuum arc-extinguishing chamber assembly is avoided, deformation and damage of the silicone rubber sealing sleeve caused by local compression are prevented, and the assembly tightness is ensured.

The invention relates to a method for measuring the internal pressure of at least one vacuum interrupter (12), comprising the following steps: applying a voltage (U) between an anode and a cathode of the vacuum interrupter (12), applying a magnetic field (F) to deflect an electron path, measuring a discharge current of gas particles that have been struck and thereby ionized by electrons and have discharged in a vacuum of the vacuum interrupter (12), and measuring the internal pressure by converting the discharge current (I), wherein the measurement of the discharge current (I) is carried out in a defined sub-region (24) of the vacuum interrupter (12). The invention further relates to a measuring system (10) for operating such a method.

The utility model relates to a back-mounted solid-sealed polar pole for a primary and secondary deep fusion switch, which adopts a split structure and comprises an insulating shell, a wire outlet rod, a voltage sensor, a vacuum arc-extinguishing chamber and a pull rod assembly, the insulating shell is provided with a first assembly cavity, a second assembly cavity and a wire outlet rod sleeve extending outwards, the wire outlet rod sleeve is communicated with the first assembly cavity, and the voltage sensor is arranged in the second assembly cavity. The vacuum arc-extinguishing chamber and the pull rod assembly are fixedly inserted in the first assembly cavity, the voltage sensor is fixedly inserted in the second assembly cavity, and the wire outlet rod is fixedly inserted in the wire outlet rod sleeve. According to the utility model, each primary element and each secondary element of the pole-mounted switch are integrated, so that integration, miniaturization, digitization and intellectualization of the pole-mounted switch are realized, and deep integration of the primary element and the secondary element is realized. The components are of a split structure and can be quickly assembled and formed after being respectively detected to be qualified, so that the qualification rate of a pole post finished product is ensured, when a certain component is damaged or breaks down, only the corresponding component needs to be replaced, and the pole post product cannot be scrapped.

The present invention discloses an outdoor vacuum circuit breaker with a built-in isolating switch, comprising a housing, a first sleeve, a second sleeve, a vacuum interrupter, and an isolating switch; the first sleeve and the second sleeve are respectively arranged on opposite sides of the housing, an insulating box is fixed in the housing, the isolating switch and the vacuum interrupter are installed in different chambers on the insulating box, and a first conductor, a second conductor, a third conductor, and the vacuum interrupter are injection-molded and fixed in the insulating box; the vacuum interrupter is arranged vertically, the lower end of the static conductive rod in the lower part of the vacuum interrupter is fixedly connected to the third conductor, the outer end of the dynamic conductive rod at one end of the vacuum interrupter is connected to the first conductor via a flexible connecting conductor, the isolating knife is rotatably mounted on the third conductor, the contact knife seat is connected to the second conductor, and a first drive mechanism and a second drive mechanism are provided above the insulating box in the housing. The outdoor vacuum circuit breaker of the present invention has a reasonable structure, an optimized design, is easy to assemble, is conducive to improving production efficiency, and has good product stability.

The present invention discloses a double-eddy-current driven fast switch with electromagnetic anti-bounce, comprising a vacuum interrupter, a guide rod, a permanent magnetic holding mechanism, a closing bounce suppression mechanism, a double-eddy-current driving mechanism, a frame, a plurality of electronic switches, a plurality of bounce suppression capacitors and a plurality of energy storage capacitors. The top of the guide rod is placed in the vacuum interrupter, and the guide rod extends downward to the permanent magnetic holding mechanism. The permanent magnetic holding mechanism comprises an upper closing magnet metal steel plate frame, a lower opening magnet metal steel plate frame and a moving soft iron therebetween. The upper closing magnet metal steel plate frame is embedded with an upper closing magnet; the lower opening magnet metal steel plate frame is embedded with a lower opening magnet. The present invention adopts an actuator based on a double-eddy-current drive with electromagnetic anti-bounce, which has a faster closing and opening speed, better bounce suppression performance, and greatly improves the comprehensive performance of the power protection switch equipment. The equipment has a compact structure, high reliability, strong stability, and can adapt to various working conditions.

A system and method for operating a vacuum interrupter in a self-resetting interrupter. The method includes detecting fault current, opening the vacuum interrupter a first time using power harvested from the current transformer when the fault current is detected, and storing a polarity of the detected fault current when the vacuum interrupter is opened. The method then determines a close time to close the vacuum interrupter so that the current has the same polarity that was stored when the vacuum interrupter was opened and that actuation of closing the vacuum interrupter ends at a current zero crossing, closes the vacuum interrupter at the close time, and opens the vacuum interrupter a second time after the vacuum interrupter is closed using power harvested from the current transformer.

The invention discloses a production line and a method for pretreatment of a vacuum arc-extinguishing chamber, workpieces are automatically transferred among special stations by a robot, manual carrying, waiting and loading and unloading time among working procedures is eliminated, and a carrying robot, a loading area, a plasma cleaning area, a brushing area and an unloading area are all connected with a control unit. Different working areas can be controlled through the control unit, so that the overall processing time of a single product is remarkably shortened, the production efficiency is higher, each workpiece is processed at the same position in a unified processing flow, the processing quality is more unified and stable, and the labor intensity of workers is reduced.

The utility model discloses a contact of a vacuum arc-extinguishing chamber, which belongs to the technical field of power transmission and transformation, and comprises cams, a plurality of cams are arranged in a ring sleeve, the cams surround the contact, the contact is arranged in the ring sleeve, the contact and the ring sleeve are coaxial, sliding sleeves are arranged on the cams in a sliding manner, a plurality of sliding sleeves are abutted against the outer wall of the contact, and the sliding sleeves are arranged on the outer wall of the contact. An anti-skid rubber pad is arranged on the face, making contact with the contact, of the sliding sleeve, and the bottom of the ring sleeve is in threaded connection with a bottom plate. The adjusting assembly is used for adjusting the relative height of the sliding sleeve on the cam; the positioning assembly is used for limiting the contact; according to the utility model, impurities can be effectively prevented from influencing the discharge stability of the contact.

The invention discloses a brazing method for a sapphire-ceramic vacuum arc-extinguishing chamber window and application of the brazing method. The brazing method comprises the steps that an activation layer, a barrier layer and a brazing layer are sequentially deposited on a sapphire brazing face, and a molybdenum-manganese method is used for sintering and chemical nickel plating is carried out on an annular trepanning area of a ceramic shell; the oxygen-free copper metal foil, the kovar alloy metal foil and the nickel metal foil are compounded into a whole, the oxygen-free copper side of the obtained annular composite transition ring is aligned with the sapphire brazing layer, the copper brazing filler metal ring is placed in the middle of the annular composite transition ring, the nickel side of the composite transition ring is aligned with the nickel-plated layer at the opening of the ceramic shell, the copper brazing filler metal ring is placed in the middle of the annular composite transition ring, and the obtained assembly is subjected to vacuum brazing. Two high-strength and high-airtightness brazed joints are formed at a time, and therefore the sapphire window is connected to the ceramic shell in a sealed mode through the composite transition ring. By introducing a multi-layer composite transition layer structure, the thermal stress matching problem is effectively solved, so that a sealing interface with ultrahigh air tightness, high mechanical strength and excellent long-term reliability is realized.

Load break switch for controlled interruption of an electrical current, comprising: a switch blade for switching the electrical current; a blade support for supporting and operating the switch blade; a vacuum interrupter for controlled current interruption; and an actuator cam rotatable about a cam axis for operating the vacuum interrupter; wherein the switch blade is electricallyconductive and rotatable at a first blade end about a blade axis and wherein a second blade end is rotationally displaceable, in sequence, to electrically: connect the first blade end to a primary blade contact, connect the first blade end to a secondary blade contact, and disconnect the first blade end; wherein the vacuum interrupter is connected between the primary and secondary blade contacts to provide a shunt circuit for controlled current interruption; wherein the blade support is arranged, at the second blade end, to cause the rotation of the actuator cam to open the vacuum interrupter.

A switching unit includes a pair of switching poles electrically connected in series. Each switching pole includes a vacuum interrupter housing a fixed contact and a movable contact, the movable contact moving between an opening position in which the movable contact is separated from the fixed contact and a closing position in which the movable contact is electrically coupled with the fixed contact. The switch unit includes an improved drive assembly operably coupled to the movable contact of the switch pole to actuate the movable contact.

The utility model provides a 12kV outdoor all-insulation double-fracture load switch, which comprises a box body and inlet and outlet wire insulation sleeve assemblies at two sides of the box body, and further comprises an arc extinguishing fracture mechanism and a visible fracture mechanism which are positioned in the box body and are connected through a copper bar; the arc extinguishing fracture mechanism and the visible fracture mechanism are respectively connected with the incoming and outgoing line insulating sleeve assembly, and a visible window is arranged at a position, corresponding to the visible fracture mechanism, of the box body; the box body forms a sealing box, the sealing box is filled with air, and an insulating layer is arranged on the outer surface of the sealing box. According to the utility model, the two fractures and the load switch filled with nitrogen are added, SF6 gas is replaced, the vacuum arc extinguish chamber is used for breaking fault current, and the linear arc extinguish chamber is used for providing the visible fractures, so that the problem of insulating media of the load switch is solved, and the characteristics of intrinsic insulation and visible fractures are reserved at the same time.

The utility model discloses a circuit breaker switch for a 24kV circuit breaker switch cabinet, which comprises a vacuum switch and an isolating switch, the vacuum switch comprises a vacuum arc-extinguishing chamber, the isolating switch comprises an isolating switch static contact, the isolating switch static contact is lapped at the static end of the vacuum arc-extinguishing chamber through a connecting device, the connecting device comprises a pressing rod and a contact support, and the pressing rod is in lap joint with the contact support. The compression bar is in threaded connection with the contact support, the compression bar is movably connected with the contact support, and the static contact and the static end of the disconnecting switch are kept in a lap joint state and the fixed height of the vacuum arc-extinguishing chamber is adjusted through the movement of the compression bar, so that the height of the compression bar can be adjusted in the vertical direction, and the fixed height of the vacuum arc-extinguishing chamber is further adjusted; the pressure of the moving contact at the moving end of the three-phase vacuum arc-extinguishing chamber and the wear compensation over-travel of the moving contact are adjusted, so that the lapping effectiveness of the contact within the allowable wear extent range of the contact is ensured.

This invention discloses a single-axis transmission five-position load switch device, including an insulating support housing. The insulating support housing is connected to a primary input terminal and a primary output terminal. It also includes a vacuum interrupter, a moving contact, a grounding stationary contact, and a common stationary contact. The vacuum interrupter is disposed within the insulating support housing, and its stationary end is connected to the primary output terminal. A disconnector stationary contact is connected to the primary input terminal. A rotating shaft is rotatably mounted on the insulating support housing. The moving contact is engaged with the rotating shaft, and its two ends are a first contact portion and a second contact portion, respectively. The grounding stationary contact and the common stationary contact are both disposed within the insulating support housing. The common stationary contact is electrically connected to the moving end of the vacuum interrupter. The moving end of the vacuum interrupter and the rotating shaft are linked together via a linkage mechanism.

The application discloses a vacuum arc-extinguishing chamber with two-stage bellows, which comprises a porcelain shell, a moving contact, a static contact, a guide cylinder, a connecting guide rod, a first-stage bellow and a second-stage bellow; the porcelain shell is provided with a static end cover plate and a moving end cover plate at two ends respectively; the inner end of the guide cylinder is slid through the moving end cover plate and is slid to be arranged outside the moving contact, the inner end of the connecting guide rod is penetrated into the guide cylinder and is connected with the moving contact, and the connecting guide rod is provided with a stop structure; the stop structure is used for stop cooperation with the inner cavities of the guide cylinder at two ends during opening and closing; the first-stage bellow is arranged between the upper end of the guide cylinder and the moving contact, and the second-stage bellow is arranged between the outer periphery of the guide cylinder and the moving end cover plate. The first-stage bellow and the second-stage bellow are connected in series through the guide cylinder, the large opening distance and long stroke are realized through the asynchronous movement of the two-stage bellows during the opening and closing movement, the total length of a single bellow under the same opening distance stroke is reduced, and the mechanical life of the bellow can be greatly improved.

The invention discloses a contact supporting structure of a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber and a using method, and relates to the technical field of vacuum arc-extinguishing chambers. The magnetic control cup comprises a cup base, a contact blade, a magnetic control element, a central supporting body and an anti-rotation limiting piece. The contact blade is combined with the cup base, and the magnetic control element and the center supporting body are arranged in a cavity defined by the cup base and the contact blade. The lower end of the central supporting body is fixed with the contact blade, the upper end of the central supporting body is separated from the inner bottom surface of the cup base, and the periphery of the central supporting body is provided with a magnetic control element placing station. The anti-rotation limiting piece is provided with a fixed end and a limiting end, the fixed end and the cup base are coaxially fixed, and the limiting end extends into the cavity to penetrate through the center supporting body to limit rotation of the center supporting body and restrain the limiting distance of the center supporting body away from the inner bottom face of the cup base. Shunting of the ferromagnetic block and the stainless steel support during opening of the moving and static contacts can be avoided, and a strong longitudinal magnetic field is maintained; the contact is ensured to be sufficiently supported during closing stress, and rotation deformation of the contact finger of the cup base and deformation of the contact are avoided.