1468results about "Circuit-breaking switch details" patented technology

The utility model discloses a small leakage protection circuit breaker, an operating mechanism thereof and a double-breakpoint test loop. The operating mechanism comprises a handle and a reset torsion spring, the operating mechanism has a switching-on state and a switching-off state, and the reset torsion spring is used for providing reset force for the handle; wherein the reset torsion spring is made of a conductive material; the double-breakpoint test loop comprises a first breakpoint, a second breakpoint and a test button; when the operating mechanism is in a closed state, the first breakpoint is in an on state under the pressing of the operating mechanism; when the operating mechanism is in an opening state, the first breakpoint is in a breaking state; the second breakpoint comprises a second static contact and a second moving contact, the second moving contact and the reset torsion spring are integrally formed, the second moving contact is located below the test button, and when the test button is pressed by external force, the second moving contact and the second static contact are in a connected state; when the first breakpoint and the second breakpoint are both in the on state, the double-breakpoint test loop is conducted; the device has the advantage of being more compact in structure.

A contact unit and a rotary isolation switch. The contact unit comprises a housing and a contact mechanism provided in the housing, wherein the contact mechanism comprises a pair of stationary contact assemblies and a moving contact assembly, each stationary contact assembly comprising a stationary contact portion; arc-extinguishing systems are provided on either side of the contact mechanism, each arc-extinguishing system comprises an arc-extinguishing cover, one end of which serves as an arc inlet; the contact mechanism further comprises a shell, which has an accommodating cavity provided with two opposite openings, each opening being connected to one arc inlet; and the moving contact assembly and the stationary contact portions are mounted into the accommodating cavity, the moving contact assembly is located between the pair of stationary contact portions, and the contact mechanism and the arc-extinguishing systems on the two sides jointly form a relatively closed space. In the present invention, the contact mechanism and the arc-extinguishing systems on the two sides jointly form the relatively closed space, such that the arc generated by the contact mechanism flows in the relatively closed space, thereby improving the arc-striking and arc-quenching effects.

The invention discloses a molded case circuit breaker, which comprises a shell, and an electric operating mechanism is arranged in the shell. The electric operating mechanism comprises a moving contact action assembly with a rotating block and a shifting rod, a sliding block which is arranged on the shell in a sliding manner and can drive the shifting rod to shift, an operating shaft which can drive the sliding block to slide and is provided with an operating hole site, and a motor speed reduction assembly which can drive the operating shaft to rotate, and the operating shaft is in linkage connection with a shifting shaft block; the sliding block is provided with a matching groove corresponding to the shifting shaft block, the operation shaft rotates to drive the shifting shaft block to shift in the matching groove so as to drive the sliding block to slide, the shell is provided with a cover plate capable of shielding the operation hole position in a sliding mode, and the shell is further provided with a rotating lock and a tripping button located on one side of the rotating lock. By arranging the locking microswitch, the manual microswitch, the first microswitch and the second microswitch, signal feedback of a manual operation state, a rotating lock locking state and a current circuit breaker state can be realized.

The invention relates to the technical field of electric protectors, and discloses an arc-extinguishing anti-electric-shock electric protector with a fire extinguishing device.The arc-extinguishing anti-electric-shock electric protector comprises a protection box, an electric shock block is fixedly installed on the inner wall of the top of the protection box, an arc-shaped electric shock plate is fixedly installed on the inner wall of the top of the protection box, and the top end of the arc-shaped electric shock plate extends out of the protection box; an electric shock rod is installed on the inner wall of the top of the protection box in a hinged mode, the arc-shaped electric shock plate penetrates through the electric shock rod and is in sliding connection with the electric shock rod, the power-off mechanism comprises an arc-shaped spring fixedly installed on the inner wall of the top of the protection box, and the tail end of the arc-shaped spring is fixedly connected with the electric shock rod; an electric shock groove is formed in the surface of the electric shock rod, and a T-shaped sliding block is slidably installed in the electric shock groove. Electric arcs can be generated in the process that the electric shock rod leaves the electric shock block, and the electric arcs can be absorbed by the arc extinguishing grid pieces and are divided into a plurality of short arcs, so that the effects of accurately cutting off power and effectively treating the electric arcs are achieved.

A direct-current double-channel arc extinguishing structure of a circuit breaker comprises an arc extinguishing chamber and is characterized in that a magnetic conductive block is arranged at an arc inlet of the arc extinguishing chamber, and the magnetic conductive block and first magnetic steel and second magnetic steel arranged on the two sides of the arc inlet of the arc extinguishing chamber respectively form a corresponding first arc running channel and a corresponding second arc running channel. And the magnetic field force in the first arc running channel or the second arc running channel can correspondingly enable the corresponding forward electric arc or reverse electric arc generated by the circuit breaker to be subjected to magnetic blow-out force towards the direction of the arc extinguish chamber. According to the arc extinguishing structure, the arc running channel is divided into two strong magnetic channels with opposite magnetic forces by arranging the magnetic conductive block on the arc striking angle. The non-polarity requirement of the high-voltage direct-current circuit breaker in use can be met, and the electrical life, breaking performance, criticality and other performance of the non-polarity high-voltage direct-current circuit breaker can be effectively improved.

According to the technical scheme, the arc extinguishing mechanism of the air circuit breaker is characterized in that the arc extinguishing mechanism comprises a shell, and a mounting hole is formed in the outer portion of the shell; the grid baffle plate is movably arranged in the mounting hole in a sleeving manner; the placing block is fixedly connected to one side of the grid baffle plate, and an insulating frame is movably arranged in the placing block in a sleeving manner; the adjusting part is arranged in the placing block; through the arrangement of the cleaning piece, after the arc extinguishing grid pieces are used for a long time and the shell is detached from the interior of the distribution box, the position of the adjusting frame is adjusted by using the adjusting part, so that the adjusting frame can move up and down outside the arc extinguishing grid pieces; at the moment, the plurality of cleaning pieces can clean the surfaces of the left side and the right side of the arc extinguishing grid piece respectively, so that dirt deposited on the surfaces of the arc extinguishing grid piece is removed, and the dirt on the surfaces of the arc extinguishing grid piece is prevented from affecting the arc extinguishing effect.

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a static contact and a movable assembly, and the static contact is provided with a static contact point; the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element, a support and a fixing piece, the movable spring mechanism is provided with a movable contact opposite to the static contact, the elastic element is arranged between the movable spring mechanism and the pushing mechanism, the two ends of the elastic element abut against the movable spring mechanism and the pushing mechanism respectively, the fixing piece is connected to the pushing mechanism and the support, and the support is in sliding fit with the movable spring mechanism; a supporting surface facing the movable spring mechanism is formed on the fixing sheet, the supporting surface is located between the movable spring mechanism and the pushing mechanism, the supporting surface, the movable spring mechanism and the pushing mechanism are arranged at intervals, and the supporting surface can support the movable spring mechanism on the path where the movable spring mechanism moves away from the static contact. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

The invention belongs to the technical field of power equipment, and particularly relates to a mining high-voltage explosion-proof circuit breaker which comprises a shell, a mounting frame, an arc extinguishing assembly and a permanent magnet assembly. The rotating rod is rotationally connected to the mounting frame through a bearing; the hand separating mechanism is mounted at the rear end of the shell; the interlocking mechanism comprises interlocking parts arranged at the lower ends of the two sides of the shell, the interlocking parts are used for synchronously opening when the box door is opened, and the interlocking parts are further provided with positioning parts; and the auxiliary mechanism comprises linkage parts arranged at the upper ends of the two sides of the shell, and the two sides of the shell are further provided with a limiting part and an oil spraying part. Through multi-stage cooperation of permanent magnet driving, mechanical interlocking, emergency manual opening and an intelligent lubricating system, safe opening and closing, door opening forced outage, overhaul false closing prevention and long-term maintenance of key components of the mining high-voltage circuit breaker are achieved, and operation safety and equipment reliability in the explosion-proof environment are remarkably improved.

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a static contact and a movable assembly, and the static contact is provided with a static contact point; the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element and a support, the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element and a support, the movable spring mechanism is provided with a movable contact opposite to the static contact, the movable spring mechanism is elastically matched with the pushing mechanism through the elastic element, and the support is connected to the pushing mechanism; the movable spring mechanism is provided with a sliding structure, the support is provided with a sliding groove in sliding fit with the sliding structure, a supporting face located on the side, facing the pushing mechanism, of the sliding structure is formed on the side wall of the sliding groove, the supporting face and the sliding structure are spaced, and the supporting face is used for supporting the sliding structure when the movable contact and the static contact bounce off due to short-circuit current. The sliding structure is abutted against one position on a path of the moving spring mechanism moving away from the static contact. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

The invention discloses a rapid fusing device for adaptive overload protection, and belongs to the technical field of overload protection. Comprising a multi-dimensional monitoring module used for collecting circuit current, environment temperature and humidity and equipment operation parameters in real time; the intelligent processing module is internally provided with a self-adaptive algorithm unit, and dynamically calculates and adjusts a multi-stage fusing threshold value based on real-time acquired data; the rapid execution module comprises a composite fusing structure and an arc extinguishing unit, and the composite fusing structure executes overload early warning, graded fusing or complete cutting action according to the multi-stage fusing threshold value; and the communication interaction module is used for realizing device state remote monitoring, threshold parameter remote configuration and fault information uploading. Parameters such as current, temperature and humidity are collected in real time through the multi-dimensional monitoring module, a multi-stage fusing threshold value is dynamically adjusted in combination with a self-adaptive algorithm of the intelligent processing module, the limitation that the threshold value of a traditional fuse is fixed is broken through, load fluctuation and environment change can be accurately adapted, and mistaken fusing or protection lag is avoided.

An arc extinguish chamber of a circuit breaker comprises a fixed seat, an arc chute assembly composed of a plurality of arc extinguish sheets is arranged in the fixed seat, each arc extinguish sheet comprises a main body, extension parts arranged at two ends of the main body and a diversion trench arranged between the extension parts, each extension part comprises a diversion surface connected with the diversion trench, the diversion surface is arranged in an inclined manner, and the diversion trench is arranged in the main body. Flow guide sawteeth are arranged on the flow guide surface, each flow guide sawtooth comprises a groove part and a protruding part, and the inclination angle of the bottom surface of each groove part is consistent with that of the flow guide surface. The inclined flow guide surface can effectively guide the electric arc and the air flow to flow towards a specific direction, thereby preventing the electric arc from irregularly diffusing among the arc extinguishing sheets, and improving the arc extinguishing efficiency. And the diversion sawteeth form a multi-direction diversion effect through the groove parts and the protruding parts, so that the airflow dispersion is more uniform, the arc path is further lengthened, and the arc cooling capability is enhanced.

The invention discloses a dual redundant drive type self-adaptive double-speed circuit breaker, and relates to the technical field of circuit breakers. Comprising a main body, a locking assembly is arranged on one side of a connecting piece, a cleaning assembly is arranged at the top of a second bevel gear, and a moving assembly is arranged in a cleaning plate, a lead screw rotates to drive a sliding column to move, then a base is driven to move synchronously, and the base moves to drive a positioning column to move into the connecting piece; the sliding column drives the lock catch to rotate through an inclined plane arranged on the sliding column, the lock catch and the protruding position of the connecting piece are in a locking state after the lock catch rotates, the position of the touch panel in a disengaged state is locked, and potential safety hazards caused by the fact that the touch panel makes contact with the contact again after a worker mistakenly touches the handle are prevented. And after the inclined surface of the sliding column is separated from the lock catch, the lock catch is driven to rotate through the first spring, so that the locking of the connecting piece is released.

The invention relates to the technical field of circuit breakers, and discloses a separated arc extinguish chamber of a circuit breaker, the arc extinguish chamber is arranged in a plastic shell, a static contact and a moving contact are arranged in the plastic shell, a swing partition plate is rotatably mounted in the arc extinguish chamber, the moving contact is fixedly connected with the swing partition plate, the static contact is fixedly mounted in the plastic shell, and the fixed contact is fixedly mounted in the plastic shell. The arc extinguish chamber is internally provided with a separated arc chute assembly, and the separated arc chute assembly is disposed in an area between the static contact and the swing separator plate. The arc extinguishing chamber is internally provided with a separated arc extinguishing gate assembly, arc extinguishing gate sheets in the separated arc extinguishing gate assembly are arranged in a separated manner, when a moving contact and a static contact are disconnected to generate an electric arc, the distance between the arc extinguishing gate sheets is rapidly increased from small, a long electric arc is cut into a short electric arc, arc discharge and thick and thin arc division are performed on the short electric arc, and the arc extinguishing effect is improved. And the air resistance value in the gap between the adjacent arc extinguishing grid sheets is increased along with the increase of the gap distance, so that the arc voltage on each gap is reduced, and the arc is quickly extinguished.

The invention relates to the technical field of circuit breakers, in particular to a fast breaking circuit breaker which comprises a shell and a contact assembly arranged in the shell, the contact assembly comprises a movable contact arranged in a rotating mode and a fixed contact arranged in a fixed mode, and a movable contact driving arm is further arranged in the shell in a rotating mode. The moving contact driving arm is used for driving the moving contact to rotate until the moving contact is disconnected with the static contact, an electromagnetic tripping assembly is further arranged in the shell, the electromagnetic tripping assembly comprises a driving piece and a transmission piece arranged in a rotating mode, and the transmission piece is used for abutting against the moving contact driving arm to limit rotation of the moving contact driving arm. And the driving piece is used for generating magnetic force and enabling the transmission piece to rotate until the transmission piece is separated from the moving contact driving arm. Through the innovative design of the electromagnetic tripping assembly, rapid breaking of the circuit breaker is realized.

The invention relates to the field of low-voltage electric appliances, in particular to an arc extinguishing system and a circuit breaker comprising the same, in the arc extinguishing system, a plurality of arc extinguishing grid sheets of an arc extinguishing chamber are arranged side by side along a first direction, and an arc inlet and an exhaust port of the arc extinguishing chamber are respectively positioned at two ends of the arc extinguishing chamber in a third direction; front permanent magnets and rear permanent magnets of the magnetism generating structure are oppositely arranged on the two sides of the arc extinguish chamber in the second direction, the first direction, the second direction and the third direction are perpendicular to one another, a left rear permanent magnet and a right rear permanent magnet of the rear permanent magnets are arranged side by side in the first direction, and a left front permanent magnet and a right front permanent magnet of the front permanent magnets are arranged side by side in the first direction; in the second direction, the left rear permanent magnet and the left front permanent magnet are arranged on the two sides of the left part of the arc extinguish chamber in a homopolar opposite manner, the right rear permanent magnet and the right front permanent magnet are arranged on the two sides of the right part of the arc extinguish chamber in a homopolar opposite manner, and the magnetic poles facing the arc extinguish chamber in the same group of permanent magnets are opposite; the arc extinguishing system can be used for extinguishing direct-current and alternating-current arcs, and has no special requirement on the wiring direction of the circuit breaker.

The invention discloses a quick closing operation mechanism of a circuit breaker, which comprises a shell, a handle, a static contact supporting piece, a moving contact supporting piece, a linkage piece and a tripping mechanism, and is characterized in that the handle and the moving contact supporting piece are rotationally arranged in the shell, a contact torsion spring is arranged between the shell and the moving contact supporting piece, the moving contact supporting piece is provided with a long circular hole, and the linkage piece is arranged in the long circular hole; a pin shaft is arranged in the shell and penetrates through the oblong hole, and the moving contact supporting piece rotates relative to the pin shaft; an installation area is arranged in the shell, the energy storage limiting piece slides and is limited in the installation area, the handle is provided with a moving area, the moving contact supporting piece is provided with an abutting portion, and the energy storage limiting piece is provided with a moving portion limited in the moving area and a matching portion. And in the last section of closing action, energy storage is realized based on the energy storage limiting piece, oxide between the moving contact and the static contact can be quickly broken down, and the overall closing effect is improved.

An electronic leakage circuit breaker. It solves the problem that the existing contact system will affect the control circuit board when disconnected. It includes a shell, the shell includes a first shell and a middle shell, the first shell and the middle shell cooperate with each other to form a first accommodating chamber, and also includes: a first contact mechanism, which is arranged in the first accommodating chamber and is arranged in close contact with the middle shell; the first contact mechanism includes a moving contact piece and a static contact piece; a zero-sequence transformer, which is arranged in the first accommodating chamber; a control circuit board, which is connected to the zero-sequence transformer and is used to receive the signal on the zero-sequence transformer; an isolation component, which is arranged between the control circuit board and the first contact mechanism, and is used to separate the control circuit board and the first contact mechanism. The beneficial effect of the utility model is that an isolation component is provided to separate the control circuit board and the first contact mechanism, so as to prevent the arc of the contact mechanism from affecting the control circuit board and thus affecting the life and stability of the product.

The invention discloses an alternating-current high-voltage rotational symmetric busbar frame circuit breaker, and relates to the technical field of electrical equipment, the alternating-current high-voltage rotational symmetric busbar frame circuit breaker comprises a circuit breaker main body of a rectangular frame structure, and the outer wall of one side of the circuit breaker main body is provided with a deflector rod used for efficiently guiding contacts of the circuit breaker main body to be separated. The deflector rod is made of high-strength alloy steel, one end of the deflector rod is in a bent angle shape, the end, close to the circuit breaker body, of the deflector rod is electrically connected with an internal contact of the circuit breaker body, one end of the high-voltage arc-extinguishing chamber is matched with the internal contact of the circuit breaker body in an inserted mode, and the high-voltage arc-extinguishing chamber is in a cube shape. A gas production increasing unit is arranged outside one side of each arc extinguishing grid piece, a back anti-breakdown unit is arranged inside one side of the base, a discontinuous deionization unit is arranged on one side, close to the base, of each arc extinguishing grid piece, and the gas flow rate and the gas volume are increased through the gas production piece, so that gas flow in the high-voltage arc extinguishing chamber is promoted.

The utility model belongs to the technical field of power equipment, and discloses a circuit breaker. The circuit breaker comprises a base and a cover body, the cover body and the base are mutually buckled to form a mounting cavity, a plurality of heat dissipation holes are formed in the top of the cover body, a connecting plate is arranged at the bottom of the cover body, one end of the connecting plate is attached to the end face of the base, a plurality of flow guide structures are arranged on the connecting plate, and the heat dissipation holes and the flow guide structures are all communicated with the mounting cavity. And the mounting cavities can be communicated with the external space through the heat dissipation holes and the flow guide structures. According to the utility model, under the condition that the overall volume of the circuit breaker is not influenced, gas convection is formed, the heat dissipation efficiency is improved, and the temperature rise of the circuit breaker is reduced.

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a static contact and a movable assembly, and the static contact is provided with a static contact point; the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element and a support, the movable spring mechanism is provided with a movable contact opposite to the static contact, the movable spring mechanism is elastically matched with the pushing mechanism through the elastic element, and the support is connected to the pushing mechanism and is in sliding fit with the movable spring mechanism; the support is provided with a supporting structure, a supporting surface is formed on the supporting structure, the supporting surface and the movable spring mechanism are arranged at an interval, and the supporting surface is used for supporting the movable spring mechanism on a path of the movable spring mechanism moving away from the static contact when the movable contact and the static contact are bounced off due to short-circuit current. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

The invention discloses a circuit breaker arc extinguishing system and an arc extinguishing method, and belongs to the field of circuit breaker arc extinguishing. An arc extinguishing system of a circuit breaker comprises a shell and an arc extinguishing chamber fixedly connected to the end portion of the shell. According to the invention, through rotation of the fan blades, external air is extracted into the heat dissipation chamber and acts on the heat dissipation fins, so that the heat dissipation fins further cool SF6 gas in the blowing rod, and the SF6 gas has a relatively low temperature so as to reduce the energy of an electric arc, thereby reducing the duration and strength of the electric arc, being beneficial to reducing the damage of the electric arc to equipment, and improving the safety of the equipment. The arc extinguishing efficiency is improved, so that the SF6 gas can extinguish the arc more quickly, a circuit breaker and equipment are well protected, meanwhile, the arc is guided to the grid plate more quickly, the staying time of the arc between the contacts is shortened, damage of the arc to the contacts is reduced, the situation that the equipment is damaged due to poor contact of the contacts is prevented, and the service life of the circuit breaker is prolonged. And when the circuit breaker is normally connected with the circuit, electric sparks are generated to cause fire disasters.

The application discloses a quick closing operation mechanism of a circuit breaker, which comprises a shell, a handle, a static contact support, a movable contact support, a linkage and a tripping mechanism, the handle and the movable contact support are rotationally arranged in the shell, a contact torsional spring is arranged between the shell and the movable contact support, a long circular hole is arranged on the movable contact support, a pin shaft is arranged in the shell and passes through the long circular hole, and the movable contact support rotates relative to the pin shaft; an installation area is arranged in the shell, an energy storage limiting piece is slidably arranged in the installation area, a movable area is arranged on the handle, an abutting portion is arranged on the movable contact support, the energy storage limiting piece is provided with a moving portion and a matching portion which are arranged in the movable area, the application can make the movable contact support move beyond the stroke, is not limited to a fixed point, improves the contact force, and based on the energy storage limiting piece, the last action of closing is realized to store energy, the oxides between the movable contact and the static contact can be quickly broken down, and the overall closing effect is improved.

The invention discloses a self-energy arc extinguishing device, a circuit breaker and an electric power system, the self-energy arc extinguishing device comprises an air compression chamber, an expansion chamber, a first nozzle and a moving arc contact, and a piston pull rod is arranged in the air compression chamber; the expansion chamber is connected with the air compression chamber, and the front end of the piston can extend into the expansion chamber to form a boosting air chamber; the first nozzle is arranged at the end, away from the air compression chamber, of the expansion chamber, and an arc generation area is formed in the first nozzle. The moving arc contact is arranged at the front end of the piston, a first channel is arranged in the moving arc contact, one end of the first channel is communicated with the boosting air chamber, the other end of the first channel faces the arc generation area, a first one-way valve is arranged on the circumferential wall of the boosting air chamber, and the first one-way valve is configured to enable the boosting air chamber to be communicated with the expansion chamber in a one-way mode. The self-energy arc extinguishing device can make full use of expansion pressure caused by arc energy, and the voltage building capacity of the expansion chamber is greatly improved.

Provided in the present application are a circuit breaker and a power apparatus. The circuit breaker comprises an upper housing, a lower housing and a bus bar. The upper housing comprises a piston cavity, wherein a piston is accommodated in the piston cavity, and the piston moves after being subjected to force to cut off the bus bar. The lower housing comprises an arc-extinguishing cavity, wherein an arc-extinguishing grid is accommodated in the arc-extinguishing cavity. The circuit breaker further comprises at least one air chamber and an air channel, wherein the air chamber is arranged on the upper housing and / or the lower housing, one end of the air channel is in communication with the arc-extinguishing cavity, the other end of the air channel is in communication with the air chamber, a first gap is provided between the arc-extinguishing grid and a first side wall of the lower housing, and the air channel comprises the first gap. Thus, high-temperature and high-pressure gas generated due to arc extinguishing in the lower housing can be guided to the air chamber for cooling, thereby reducing potential safety hazards. Moreover, compared with the way of directly discharging the high-temperature and high-pressure gas to the outside, other devices in the power apparatus cannot be damaged.

A circuit breaker comprises a shell, an arc extinguish chamber and an arc striking chamber, the arc extinguish chamber and the arc striking chamber are arranged in the shell, the arc striking chamber comprises two arc isolating pieces which are oppositely arranged, an arc striking channel is formed between the two arc isolating pieces, the shell comprises two side plates, the two side plates are arranged on the side faces, away from the arc striking channel, of the two arc isolating pieces respectively, and the two side plates are arranged on the side faces, away from the arc striking channel, of the two arc isolating pieces respectively. At least one side plate is provided with a supporting wall, a flow guide cavity is defined by the supporting wall, the side plates and the arc isolating piece, the flow guide cavity and the arc striking channel are oppositely arranged on the two sides of the arc isolating piece, and the flow guide cavity is provided with an air inlet communicated with the arc striking channel and an air outlet communicated with an arc extinguish chamber. When the air pressure of the gas generated by breaking of the circuit breaker is high, the gas can enter the flow guide cavity under the driving of the air pressure difference, the high-temperature and high-pressure gas generated at the breaking moment is prevented from being all concentrated in the arc striking channel, and the gas enters the arc extinguish chamber to be extinguished after being cooled and subjected to auxiliary pressure relief through the flow guide cavity.

The invention discloses an automatic circuit breaker handcart for a switch cabinet, and belongs to the technical field of circuit breakers, the automatic circuit breaker handcart for the switch cabinet comprises a bottom frame, the bottom frame is movably provided with a circuit breaker handcart, the circuit breaker handcart is provided with a plurality of arc extinguish chambers, and the arc extinguish chambers are provided with moving contacts. A front frame is installed at one end, far away from the circuit breaker handcart, of the bottom frame, an aviation socket located on one side, far away from the circuit breaker handcart, of the front frame is arranged on the bottom frame, a signal lead is installed on the aviation socket, and a pushing assembly connected with the circuit breaker handcart is arranged between the circuit breaker handcart and the front frame. A movable transmission assembly movably connected with the pushing assembly is arranged in the bottom frame, moving assemblies movably connected with the movable transmission assembly are arranged on the two sides of the bottom frame, a camera and a temperature sensor are installed on the top of one side of the front frame, and a third contact sensor is installed on the bottom frame. The device has the advantages of intelligent detection, ordered movement, full contact of moving and static contacts, safety, reliability, convenient operation, simplicity, convenience and practicability.

The invention belongs to the technical field of switches, and particularly relates to a circuit breaker or an isolating switch, which is characterized in that a backflow channel structure is additionally arranged on the side wall of an arc extinguish chamber, after the circuit breaker or the isolating switch arches, an arc moves upwards, the pressure above the arc extinguish chamber is increased, and the pressure in a middle area of a moving contact and a static contact below the arc is reduced; the backflow channel is used for supplementing the upper cold gas to the post-arc space gas, arc falling is inhibited, and the arc extinguishing performance of the product is improved.

The utility model relates to a high-voltage direct-current relay. The high-voltage direct-current relay comprises a static contact and a moving assembly. The static contact is provided with a static contact point; the movable assembly comprises a pushing mechanism, a movable spring mechanism, an elastic element and a support, the pushing mechanism comprises a pushing seat, a pushing rod and a supporting structure, the pushing rod and the supporting structure are connected to the pushing seat, and the movable spring mechanism is arranged on the side, opposite to the pushing seat, of the supporting structure and is provided with a movable contact opposite to the static contact; the movable spring mechanism is elastically matched with the pushing mechanism through the elastic element, the support is connected to the pushing seat and is in sliding fit with the movable spring mechanism, and the supporting structure is provided with a supporting face which is arranged with the movable spring mechanism in a spaced mode. And the supporting surface can support the movable spring mechanism on a path in which the movable spring mechanism moves away from the static contact. The high-voltage direct-current relay has the advantages of being small in size, low in cost and high in short-circuit current and voltage resistance.

To improving assemblability of a circuit breaker so as to eliminate a risk of a protection plate being blown off from a back surface wall of an arc-extinguishing chamber unit even if a gas pressure of the arc-extinguishing chamber rises.SOLUTION: An arc-extinguishing device 7 of a circuit breaker 1, includes: an arc-extinguishing chamber unit 16 that is arranged in a case 2, and surrounds a stationary contact 10 and a movable contact 11; and a protection plate 20 that is arranged on a back surface wall so as to cover an exhaust port 33 that is open in one side 32a of a longitudinal direction of a back surface wall 32 of the arc-extinguishing chamber unit. The protection plate comprises: a long main body part 21 that covers the exhaust port; and a base part 22 (a pair of first engagement pieces 24a and 24b, a penetration hole 25, and a second engagement piece 27) that is formed continuously to one end of the longitudinal direction of the main body part. The other side in the longitudinal direction of the back surface wall of the arc-extinguishing chamber unit 16 is provided with protection plate holding parts 35a, 35b, and 36a onto which the protection plate is integrally mounted, restricting the protection plate from departing from the back surface wall of the base part, and restricting the protection plate from moving toward one side and the other side in the longitudinal direction of the back surface wall of the base part.SELECTED DRAWING: Figure 6