CN114360966B - Contactor with enhanced magnetic field guiding arc extinguishing chamber - Google Patents
Contactor with enhanced magnetic field guiding arc extinguishing chamber Download PDFInfo
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- CN114360966B CN114360966B CN202210015607.1A CN202210015607A CN114360966B CN 114360966 B CN114360966 B CN 114360966B CN 202210015607 A CN202210015607 A CN 202210015607A CN 114360966 B CN114360966 B CN 114360966B
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Abstract
The application relates to a contactor with an enhanced magnetic field guiding arc-extinguishing chamber, which comprises a contactor body, a shell and an arc-extinguishing chamber, wherein a plurality of arc-extinguishing grid sheets are arranged in the arc-extinguishing chamber, the contactor body is provided with a plurality of contacts, gaps are reserved between the contacts and the arc-extinguishing grid sheets, the contactor body and the arc-extinguishing chamber are arranged in the shell, the contactor body further comprises a first magnetic blowing mechanism and a second magnetic blowing mechanism, the first magnetic blowing mechanism comprises two groups of magnetizers symmetrically arranged outside the shell and positioned at two sides of the arc-extinguishing grid sheets, the second magnetic blowing mechanism comprises two groups of electromagnetic coils, the two groups of electromagnetic coils are connected with the contacts in parallel, and the two groups of electromagnetic coils are arranged at two sides of the contacts side by side and generate opposite magnetic potential. The contactor with the enhanced magnetic field guiding arc extinguishing chamber disclosed by the application has the advantages that the longitudinal magnetic field intensity is enhanced by utilizing one group of magnetizers and two groups of electromagnetic coils which are connected in parallel, so that the middle of the contactor is weak, the two sides of the contactor are strong, and the current breaking capacity of the contactor is greatly improved.
Description
Technical Field
The application relates to the field of contactors, in particular to a contactor with a reinforced magnetic field guiding arc extinguishing chamber.
Background
In electrical apparatuses with contacts, the process of switching on and off the current by the contacts is often accompanied by the generation and extinction of an arc. Arcing is a gas discharge phenomenon that presents a hazard to electrical appliances. The method of achieving arc extinction by utilizing the acting force of a magnetic field on current is called magnetic quenching. When a large electrodynamic force is required to blow an arc into the arc extinguishing chamber, a strong enough magnetic field is established by adopting a special magnetic blow-out coil. It typically has one to several turns in series with the contacts. In order to make the magnetic field more intensively distributed in the arc area to increase the arc blowing force, the center of the coil is penetrated with an iron core, and the two ends of the coil are parallel to the magnetic steel plates which clamp the arc extinguishing chamber. The arc blowing effect of the series magnetic blow-out coil is obvious when the contact breaks large current, and is worse when breaking small current.
The process of cooling and elongating the arc in a gas stream by blowing the arc longitudinally or transversely with a gas, resulting in a strong de-ionization is called gas-blow extinction. The gas blow arc extinction is to extinguish the arc with compressed air. The compressed air acts on the electric arc, so that the electric arc can be well cooled, the pressure of an electric arc area is improved, and residual free gas is quickly taken away, so that the electric arc extinguishing device has higher arc extinguishing performance. Compressed air is blown in along the radial direction of the electric arc, and then discharged to the atmosphere through the nozzle and the inner hole of the movable contact, and the arc root of the electric arc can be blown off the contact surface quickly, so that the contact surface of the contact is not easy to burn. Because the pressure of the compressed air is irrelevant to the electric arc, the pressure of the compressed air is easy to cause overvoltage when the small-current electric arc is extinguished when the air blow is used for extinguishing the electric arc, and the electric arc is carried out by the air flow generated by the air blow to generate an arcing phenomenon, so that the contactor is extremely easy to damage.
Therefore, there is an urgent need for a contactor having arc extinguishing chambers that break small and large currents and are capable of complementing each other, chinese patent publication No.: CN205303389U, the name created by the application is: the utility model provides a circuit breaker with possess explosion mechanism of magnetic blow and air blow function, discloses a circuit breaker with possess explosion mechanism of magnetic blow and air blow function, including casing magnetic blow device and gas production board, be equipped with explosion mechanism and operating device in the casing, operating device is including moving contact and the static contact that corresponds to be equipped with, explosion mechanism includes the explosion chamber, be equipped with the static contact on the static contact, the explosion chamber with the static contact corresponds the setting, and magnetic blow device and gas production board correspond and locate between static contact and the explosion chamber and be used for the arc direction explosion chamber that produces when moving contact repels the static contact. The defects are that: the application concentrates the magnetic field and has air blowing, but when the small current is broken, the arc blowing effect is poor, and overvoltage is easy to be caused when the small current arc is extinguished.
The contactor provided by the application has the advantages that the longitudinal magnetic field intensity is enhanced by utilizing one group of magnetizers and two groups of electromagnetic coils which are connected in parallel, so that the middle part is weak, the two sides are strong, the small current breaking capacity of the contactor is greatly improved, and the large current can be well broken at the same time by using the linked gas generating mechanism and the multiple groups of clamping plates for blocking the electric arc from flying out, and the zero flashover effect can be ensured.
Disclosure of Invention
The application aims to provide a contactor with an enhanced magnetic field guiding arc extinguishing chamber, so as to solve the problems in the background technology.
The application provides the following technical scheme: the utility model provides a take contactor of reinforcing magnetic field direction explosion chamber, includes contactor body, casing and explosion chamber, set up a plurality of explosion bars piece in the explosion chamber, the contactor body includes a plurality of contacts, first magnetic blowing mechanism and second magnetic blowing mechanism, and the contact can move for separating brake and closing a floodgate, and leave the clearance with the explosion bars piece, contactor body and explosion chamber set up in the casing. The first magnetic blowing mechanism comprises two groups of magnetizers which are symmetrically arranged on the outer side of the shell and positioned on two sides of the arc extinguishing grid sheet, the second magnetic blowing mechanism comprises two groups of electromagnetic coils, the two groups of electromagnetic coils are connected with the contact in parallel, and the two groups of electromagnetic coils are arranged on two sides of the contact side by side and generate opposite magnetic potential. The electromagnetic coil with opposite magnetic potential can generate a magnetic field in the same direction in the inner area and the outer area of the electromagnetic coil, so that the magnetic field intensity of the second magnetic blowing mechanism can be enhanced according to the current intensity when the contacts are contacted, the magnetic field of the gap area between the arc extinguishing grid sheet and the contacts is weaker by the magnetizer, the magnetic fields of the second magnetic blowing mechanism are amplified, the gap area between the arc extinguishing grid sheet and the contacts is enabled to play a role, the magnetic field generated by the electromagnetic coil is automatically adapted to the arc length, the arc is lengthened to the arc extinguishing grid sheet to extinguish, the effect of breaking small current of the arc extinguishing chamber is improved, and meanwhile, large current can be broken.
Further, the contact comprises a fixed contact and a moving contact, the moving contact comprises a plurality of spiral contacts and an action part, the action part is movably connected to the contactor body, the action part extends to form a cantilever and is provided with the spiral contacts, and a plurality of cambered surface grooves which are in one-to-one correspondence with the spiral contacts are arranged at the connection part of the fixed contact and the moving contact. The spiral contact is contacted with or separated from the cambered surface groove through the relative rotation of the action part, so that the contact opening and closing are realized. The adoption spiral contact can guarantee the good contact of static contact and moving contact, even if spiral contact part wearing and tearing still can realize the contact of moving contact and static contact, and connection reliability is strong to can break up into little electric arc with original big electric arc through the point contact of cambered surface, rethread first magnetism blows mechanism and second magnetism blows the mechanism and lengthens a plurality of little electric arcs to arc extinguishing grid piece department and extinguishes, and the arc extinguishing effect is better.
Further, the spiral contacts are multiple and form a row at equal intervals, the spiral contacts can prevent the connection failure of the fixed contact and the moving contact caused by abrasion or poor contact of one or part of the spiral contacts, the spiral contacts are conical, spiral linear grooves are formed in the side surfaces of the spiral contacts, the cambered surface grooves are hemispherical, the fixed contact and the moving contact are in point contact, and the fixed contact and the moving contact are all connected after any one or more spiral contacts are in contact with the cambered surface grooves. The spiral line type groove gives the deformation space of the spiral contact, heat is necessarily generated after the spiral contact is electrified in contact with the cambered surface groove, the contact point is made of metal, and the metal is heated and expanded, so that after the spiral contact is heated in the cambered surface groove, a plurality of areas are formed by the original point contact, and the connection effect of the fixed contact and the moving contact is better.
Further, the contactor body further comprises a gas generating mechanism, the gas generating mechanism comprises two groups of side gas plates perpendicular to the arc-extinguishing grid plates and arranged on two sides of the arc-extinguishing grid plates, and a group of bottom gas plates arranged at the lower ends of the arc-extinguishing grid plates, and gas generating materials are arranged on the inner surfaces of the side gas plates and the upper surfaces of the bottom gas plates. When the contact passes through large current, the temperature in the arc-extinguishing chamber can be increased, the gas generating material can generate a large amount of gas under high temperature, the two groups of side gas plates generate gas at the side parts of the arc-extinguishing grid plates, the bottom gas plates generate gas at the lower ends of the arc-extinguishing grid plates, and the electric arc is guided by the magnetic field to enter the arc-extinguishing grid plates from the bottom gas plates, so that the gas generated by the bottom gas plates can help the electric arc to enter the arc-extinguishing grid plates, the gas of the side gas plates enables the electric arc to stay at the arc-extinguishing grid plates, and the electric arc is lengthened and extinguished.
Further, the gas generating mechanism further comprises an elastic piece and a rotating shaft, two ends of the rotating shaft are hinged to the shell, one end of the bottom gas plate penetrates through the rotating shaft, and the other end of the bottom gas plate is arranged at the lower end of the arc extinguishing grid in a hanging mode. One end of the elastic piece is fixed on the shell and positioned on the upper side of the rotating shaft, and the other end of the elastic piece is fixed on the upper side of one end, far away from the rotating shaft, of the bottom air plate. When the contactor breaks small current, the elastic piece stretches normally, the bottom air plate does not generate gas, even if the gas is generated, the elastic piece does not act, the gas directly enters the arc extinguishing chamber and cannot pass through the contact area, and the first magnetic blowing mechanism and the second magnetic blowing mechanism are used for extinguishing small current electric arcs. When the contactor breaks large current, the temperature in the arc extinguishing chamber is increased under the large current, the elastic piece is heated and expanded, and the bottom air plate is extruded to enable the bottom air plate to rotate downwards along the rotating shaft, so that air can fully contact with an electric arc, and the arc extinguishing effect is improved.
Further, the arc-extinguishing grid piece is slice, upwards sets up the chevron shape indent limit from the bottom, and a plurality of supporting shoe of both sides protrusion, the side air slab sets up the mounting groove that matches with the supporting shoe, and the side air slab inserts the mounting groove through the supporting shoe and installs in arc-extinguishing grid piece both sides, installs compactly to restricted the flow of gas, prevent that gas from reversing the flow. The gas generating material is coated on the side gas plate area between the supporting blocks of the two adjacent arc-extinguishing grid plates, the contact part of the side gas plate and the arc-extinguishing grid plates is a non-gas generating material area, and only the gap between the arc-extinguishing grid plates can generate gas, so that the gas can transversely stretch the arc at the arc-extinguishing grid plates until the arc is extinguished.
Further, explosion chamber still includes wire netting, intermediate lamella, insulating baffle and baffle, the intermediate lamella sets up in arc extinguishing bars piece upper end, and the intermediate lamella sets up a plurality of inlet port of a row between every two arc extinguishing bars piece, and the inlet port is used for producing the gaseous spilling over of gas mechanism, and the intermediate lamella horizontal equidistance interval sets up a plurality of side openings, and the side opening is put through with the inlet port, and the gas that produces from both sides and surplus electric arc get into the wire netting from the side opening, the wire netting sets up in the intermediate lamella upper end, is formed by a plurality of wire combinations of vertically and horizontally alternate connection, insulating baffle is annular setting in wire netting upper end, insulating baffle and casing upper end contact, a plurality of ventholes are seted up to the casing upper end, the baffle sets up in venthole below, and both ends interference articulates in the casing upper end to can be relative casing lateral rotation, the outstanding handle that sets up of baffle upper end, the handle is used for manual adjustment baffle inclination. The handle can partially cover the air outlet holes through the inclination angle of the rotary baffle plate, so that the air outlet rate of the arc extinguishing chamber is controlled. After the arc is stretched at the arc-extinguishing grid sheet, when the arc-extinguishing grid sheet is cut off and high current is supplied, part of the arc flies out from the air inlet, at the moment, the wire netting has the effect of intercepting the flying-out of the arc for the first time, the arc is gathered at the wire netting by the insulating partition board, and finally, the gas flows out from the air outlet, and the arc is blocked at the wire netting.
Further, a linkage device is arranged between the moving contact and the arc extinguishing chamber, the linkage device comprises a cam, a linkage rod and a telescopic rod, and the cam comprises a protruding portion A, a protruding portion B and a rotating portion. The bulge A and the bulge B are bulged on the rotating part and are centrosymmetric. One end of the telescopic rod is fixedly connected with the moving contact, the other end of the telescopic rod is hinged with the protruding portion A, the rotating portion is hinged to the shell, the lower end of the linkage rod is hinged to the protruding portion B, the middle of the linkage rod is hinged to one side, far away from the rotating shaft, of the bottom air plate, the upper end of the linkage rod is hinged to the upper end of the baffle, the protruding portion A and the protruding portion B can enable the linkage rod and the telescopic rod to rotate in opposite directions, and the linkage device is arranged on the inner side of the shell. The handle can also cooperate with the linkage for manually correcting the cam dead center position. When the movable contact and the fixed contact are suddenly disconnected, the movable contact rotates leftwards and drives the telescopic rod to move leftwards, the telescopic rod drives the protruding part A to rotate, the protruding part A drives the rotating part to rotate again, so that the protruding part B rotates rightwards, the linkage rod rotates rightwards along with the protruding part B, the bottom air plate is driven in the middle of the linkage rod, the upper end drives the baffle, the bottom air plate moves upwards, the bottom air plate generates air flow which can be directly aligned with an electric arc, the baffle is completely opened, the air can quickly flow out of the air outlet, and the arc extinguishing effect is improved. When the movable contact and the fixed contact are suddenly disconnected to generate small current, gas is not generated by the gas generating material, the elastic piece can press the bottom gas plate, so that the bottom gas plate is not used, and at the moment, magnetic blowing arc extinction is performed only by the first magnetic blowing mechanism and the second magnetic blowing mechanism.
Further, the explosion chamber still includes the baffle, the baffle sets up between baffle and insulating barrier, is located below the baffle, and vertically runs through and set up a plurality of interception holes, and the projection position of interception hole in vertical direction does not cover inlet port and venthole to make electric arc unable direct follow inlet port and venthole departure, even if electric arc departure wire netting also can be intercepted by the baffle, and the air current in the casing can follow the venthole and normally flow out, reaches zero flashover's effect.
Further, the magnetizer is sheet-shaped, one end of the magnetizer is wide, one end of the magnetizer is narrow, the magnetizer is fixed on the outer side of the shell and covers the gap between the arc extinguishing grid sheet and the contact, the outer side of the shell is inwards concave to form a slot matched with the shape of the magnetizer, the magnetizer is inserted into the slot from the wide end, and the magnetizer is flush with the outer surface of the shell. The magnetizer is arranged outside the shell, so that the installation is convenient, and whether the magnetizer is detached or installed can be selected according to actual needs, so that the magnetizer is convenient to use.
Compared with the prior art, the application has the following beneficial effects:
1. the electromagnetic coils with opposite magnetic potential are arranged on the contacts, so that the magnetic field strength can be changed according to the current strength of breaking the contacts, and the magnetic conductors can amplify the magnetic field generated by the electromagnetic coils, so that the middle of the magnetic fields is weaker, the two sides of the magnetic fields are stronger, and the magnetic fields play a role in the gap between the arc extinguishing grid plates and the contacts, thereby realizing the effect that the magnetic field strength is automatically adapted to the arc length, and improving the effect that the arc extinguishing chamber breaks small current;
2. the spiral contact is adopted to ensure good contact between the fixed contact and the movable contact, even if the spiral contact is worn, the contact between the movable contact and the fixed contact can still be realized, the connection reliability is strong, the original large electric arc is broken into small electric arcs through the point contact of the cambered surface, and then a plurality of small electric arcs are elongated to the arc extinguishing grid plate to be extinguished through the first magnetic blowing mechanism and the second magnetic blowing mechanism, so that the arc extinguishing effect is better;
3. the gas generating mechanism is arranged, gas can be generated between two sides of the arc-extinguishing grid sheet and between the arc-extinguishing grid sheet and the contact during large current breaking, so that gas blowing auxiliary arc extinction is formed, the bottom gas plate can automatically adjust the gas direction along with the current, the gas blowing effect is enhanced, the bottom gas plate does not act during small current breaking, the magnetic blowing effect is not hindered, and the compatibility and the reliability are strong;
4. the linkage device and the clamping plates for blocking the electric arc from flying out are arranged, and the gas generating mechanism is automatically triggered and provided with the arc extinguishing grid sheet for extinguishing arc, the baffle plate, the wire netting and the like for blocking the electric arc by utilizing the breaking linkage of the moving contact and the fixed contact, so that the zero-arcing effect can be ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
fig. 1 is a schematic view showing the appearance of a contactor with an enhanced magnetic field guide arc chute according to the present application;
fig. 2 is an internal schematic view of a contactor with enhanced magnetic field directed arc chute of the present application;
fig. 3 is a schematic view of a spiral contact of a contactor with an enhanced magnetic field directed arc chute of the present application;
fig. 4 is a schematic diagram of a linkage of a contactor with an enhanced magnetic field directed arc chute of the present application;
fig. 5 is a partial schematic view of an arc chute of a contactor with enhanced magnetic field directed arc chute of the present application;
in the figure: 1. the contactor comprises a contactor body, 2, a shell, 201, an air outlet, 3, an arc extinguishing grid sheet, 301, a supporting block, 4, a magnetizer, 5, a fixed contact, 501, a cambered surface groove, 6, a moving contact, 601, a spiral contact, 602, an action part, 7, a side air plate, 8, a bottom air plate, 9, an elastic piece, 10, a rotating shaft, 11, a wire netting, 12, a middle plate, 121, an air inlet hole, 122, a side hole, 13, an insulating partition plate, 14, a baffle, 15, a linkage rod, 16, a telescopic rod, 17, a protruding part A,18, a protruding part B,19, a rotating part, 20 and a blocking plate.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.
Referring to fig. 1-5, the present application provides the following technical solutions: the application relates to a contactor with an enhanced magnetic field guiding arc-extinguishing chamber, which comprises a contactor body 1, a shell 2 and the arc-extinguishing chamber, wherein an arc-extinguishing grid sheet 3 is arranged in the arc-extinguishing chamber, the contactor body 1 comprises a contact, a first magnetic blowing mechanism, a second magnetic blowing mechanism and a gas generating mechanism, the contact can act, a gap is reserved between the contact and the arc-extinguishing grid sheet 3, an electric arc is elongated at the gap and guided to the arc-extinguishing grid sheet 3 by the first magnetic blowing mechanism and the second magnetic blowing mechanism, and the contactor body 1 and the arc-extinguishing chamber are arranged in the shell 2. The first magnetic blowing mechanism comprises two groups of magnetizers 4 which are symmetrically arranged outside the shell 2 and positioned on two sides of the arc extinguishing grid sheet 3, the magnetizers 4 are vertically arranged with the arc extinguishing grid sheet 3, the second magnetic blowing mechanism comprises two groups of electromagnetic coils, the two groups of electromagnetic coils are connected with the contacts in parallel, and the generated magnetic potential is opposite and is arranged on two sides of the contacts side by side. The electromagnetic coils with opposite magnetic potential can generate the magnetic field in the same direction in the inner and outer areas, so that the magnetic field intensity can be changed according to the current intensity when the contacts are in contact, the magnetizer 4 strengthens the magnetic field intensity of the gap area between the arc extinguishing grid sheet 3 and the contacts, so that the middle of the arc extinguishing grid sheet is weaker, the two sides of the arc extinguishing grid sheet are stronger, the magnetic field intensity is amplified, the magnetic field intensity is automatically adapted to the arc length, the arc is lengthened to the arc extinguishing grid sheet 3 for extinction, the effect of breaking small current of the arc extinguishing chamber is improved, and meanwhile, large current can be broken. The magnetizer 4 is sheet-shaped, is made of electric pure iron, is wide at one end and narrow at one end, is fixed on the outer side of the shell 2, and covers the gap between the arc extinguishing grid sheet 3 and the contact, the outer side of the shell 2 is concaved inwards to form a slot matched with the shape of the magnetizer 4, the magnetizer 4 is inserted into the slot from the wide end, the magnetizer 4 is flush with the outer surface of the shell 2, and the installation is compact.
The contact includes fixed contact 5 and moving contact 6, and moving contact 6 includes four sets of spiral contact 601 and action portion 602, and action portion 602 is the axle, and both ends swing joint is on contactor body 1, and action portion 602 extends to casing 2 inside and forms the cantilever, and one side that is close to casing 2 inside sets up spiral contact 601, and the cantilever is close to arc extinguishing grid piece 3 one side and is the cambered surface, and action portion 602 outwards protrudes outside one side that keeps away from casing 2 and forms the handle and set up in the casing 2 outside. Four groups of cambered surface grooves 501 which are in one-to-one correspondence with the spiral contacts 601 are arranged at the connection part of the fixed contact 5 and the movable contact 6. By the relative rotation of the action part 602, the spiral contact 601 is contacted with or separated from the cambered surface groove 501, and the opening and closing of the contactor are realized. Adopt spiral contact 601 can guarantee the good contact of static contact 5 and moving contact 6, even if spiral contact 601 part wearing and tearing, the contact of moving contact 6 and static contact 5 still can be realized to the contactor, and connection reliability is strong to break up into little electric arc with original big electric arc through the point contact of cambered surface, rethread first magnetic blowing mechanism and second magnetic blowing mechanism are drawn a plurality of little electric arcs to arc extinguishing grid piece 3 departments and are extinguished, and the arc extinguishing speed piece, the probability that the arcing appears are little.
Four sets of spiral contacts 601 are equally spaced to form a row. The spiral contact 601 is a cone, the spiral linear groove is formed in the side face, the cambered surface groove 501 is a hemispherical surface, the fixed contact 5 and the movable contact 6 are in point contact, and after any one or more spiral contacts 601 are in contact with the cambered surface groove 501, the fixed contact 5 and the movable contact 6 are all connected, so that even if part of the spiral contacts 601 fail, the movable contact 6 and the fixed contact 5 can still be effectively connected. The spiral linear groove gives expansion deformation space of the spiral contact 601, heat is necessarily generated after the spiral contact 601 is electrified in contact with the cambered surface groove 501, and the contact point is made of metal, so that after the spiral contact 601 is heated in the cambered surface groove 501, a plurality of areas are formed by a plurality of original point contacts to be in surface contact, the connection effect of the fixed contact 5 and the moving contact 6 is better, the contact area of the fixed contact 5 and the moving contact 6 is only changed, and normal breaking of the fixed contact 5 and the moving contact 6 is not influenced.
The gas generating mechanism comprises two groups of side gas plates 7 perpendicular to the arc-extinguishing grid plates 3 and arranged on two sides of the arc-extinguishing grid plates 3, a group of bottom gas plates 8 arranged at the lower ends of the arc-extinguishing grid plates 3, an elastic piece 9 and a rotating shaft 10, gas generating materials are arranged on the inner surfaces of the side gas plates 7 and the upper surfaces of the bottom gas plates 8, and the gas generating materials are melamine. The two ends of the rotating shaft 10 are hinged on the shell 2, one end of the bottom air plate 8 penetrates through the rotating shaft 10, and the other end of the bottom air plate is arranged at the lower end of the arc extinguishing grid plate 3 in a suspending mode. The elastic member 9 has one end fixed to the housing 2 and located on the upper side of the rotation shaft 10, and the other end fixed to the upper side of the bottom air plate 8 at the end far from the rotation shaft 10. When the contactor breaks small current, the elastic piece 9 stretches normally, the bottom air plate 8 does not generate gas, even if the gas is generated, the elastic piece 9 does not act, the gas directly enters the arc extinguishing chamber and cannot pass through the contact area, and the first magnetic blowing mechanism and the second magnetic blowing mechanism are used for extinguishing small current electric arcs. When the contactor breaks large current, the temperature in the arc extinguishing chamber is increased under the large current, the elastic piece 9 is heated and expanded, and the bottom air plate 8 is extruded to rotate downwards along the rotating shaft 10, so that the air can fully contact with the electric arc and flow upwards, and the electric arc is elongated and guided to the arc extinguishing grid sheet 3. When the contact passes through large current, the temperature in the arc-extinguishing chamber can be increased, the gas generating material can generate a large amount of gas under high temperature, the two groups of side gas plates 7 generate gas at the side parts of the arc-extinguishing grid plates 3, the bottom gas plates 8 generate gas at the lower ends of the arc-extinguishing grid plates 3, and the electric arc is guided by the magnetic field to enter the arc-extinguishing grid plates 3 from the bottom gas plates 8, so that the gas generated by the bottom gas plates 8 can help the electric arc to enter the arc-extinguishing grid plates 3, the electric arc can be elongated and cooled in the air flow, the electric arc stays at the arc-extinguishing grid plates 3 due to the gas of the side gas plates 7, and finally is elongated and extinguished by the arc-extinguishing grid plates 3.
The arc extinguishing grating sheet 3 is sheet-shaped, a herringbone inward concave edge is formed from the bottom upwards, six groups of supporting blocks 301 are symmetrically arranged on two sides in a protruding mode, mounting grooves matched with the supporting blocks 301 are formed in the side air plates 7, the side air plates 7 are mounted on two sides of the arc extinguishing grating sheet 3 through the mounting grooves inserted into the supporting blocks 301, the mounting is compact, the flow of gas is limited, and the reverse flow of the gas is prevented. The area of the side gas plate 7 between the supporting blocks 301 of two adjacent arc-extinguishing grid plates 3 is coated with gas generating material, the contact part of the side gas plate 7 and the arc-extinguishing grid plates 3 is a non-gas generating material area, and only the gap between the arc-extinguishing grid plates 3 can generate gas, so that the gas can transversely stretch the arc at the arc-extinguishing grid plates 3 until the arc is extinguished.
The explosion chamber still includes wire netting 11, intermediate lamella 12, insulating barrier 13, baffle 14 and baffle 20, intermediate lamella 12 sets up in arc extinguishing bars piece 3 upper end, and intermediate lamella 12 is vertical to set up a row of inlet port 121 between two liang of arc extinguishing bars piece 3, and the air inlet is rectangular cross-section's through-hole, and inlet port 121 is used for producing the gaseous spilling over of gas mechanism, and intermediate lamella 12 horizontal equidistant interval runs through and sets up six group's side openings 122, and side opening 122 and inlet port 121 switch on, get into wire netting 11 from side opening 122 from the gas that both sides produced and surplus electric arc, wire netting 11 sets up in intermediate lamella 12 upper end, is formed by a plurality of wire combinations of vertically and horizontally alternate connection. The insulating partition 13 is annular and sets up in wire netting 11 upper end, and insulating partition 13 and casing 2 upper end contact, and the banding venthole 201 is seted up to casing 2 upper end, and baffle 14 setting is in venthole 201 below, and both ends interference hinge is in casing 2 upper end, and the upper end is outstanding to set up the handle, the handle is used for manual adjustment baffle 14 inclination. The handle can partially cover the air outlet hole 201 by rotating the inclined angle of the baffle plate 14, thereby controlling the air outlet rate of the arc extinguishing chamber. After the arc is elongated and broken at the arc extinguishing grid 3, part of small arc flies out from the air inlet hole 121, at this time, the wire netting 11 plays a role of intercepting the flying-out of the arc for the first time, the insulating partition 13 gathers the arc at the wire netting 11, and finally, the gas flows out from the air outlet hole 201, and the arc is blocked at the wire netting 11. Baffle 20 sets up between baffle 14 and insulating barrier 13, is located baffle 14 below, and vertically runs through and set up a plurality of interception holes, and the interception hole is the round hole, and the projection position of interception hole in vertical direction does not cover inlet port 121 and venthole 201 to make electric arc unable direct follow inlet port 121 and venthole 201 fly out, even electric arc flies out wire netting 11 also can be intercepted by baffle 20, and the air current in casing 2 can follow venthole 201 normal outflow, reaches secondary interception electric arc, finally realizes zero flashover's effect.
A linkage device is arranged between the moving contact 6 and the arc extinguishing chamber, the linkage device comprises a cam, a linkage rod 15 and a telescopic rod 16, and the cam comprises a protruding part A17, a protruding part B18 and a rotating part 19. The protruding part a17 and the protruding part B18 are protruding on the rotating part 19 and are symmetrical in center, and the protruding part a17 and the protruding part B18 as a whole synchronously rotate relative to the rotating part 19. One end of the telescopic rod 16 is fixedly connected with the moving contact 6, the other end of the telescopic rod is hinged with the protruding portion A17, the rotating portion 19 is hinged to the shell 2, the lower end of the linkage rod 15 is hinged to the protruding portion B18, the middle of the linkage rod is hinged to one side, far away from the rotating shaft 10, of the bottom air plate 8, the upper end of the linkage rod 15 is hinged to the upper end of the baffle 14, the protruding portion A17 and the protruding portion B18 enable the linkage rod 15 and the telescopic rod 16 to rotate in opposite directions, and the linkage device is arranged on the inner side of the shell 2. The handle can also cooperate with the linkage for manually correcting the cam dead center position. When the moving contact 6 and the fixed contact 5 are suddenly disconnected, the moving contact rotates leftwards and drives the telescopic rod 16 to move leftwards, the telescopic rod 16 drives the protruding part A17 to rotate, the protruding part A17 drives the rotating part 19 to rotate, so that the protruding part B18 rotates rightwards, the linkage rod 15 rotates rightwards along with the protruding part B18, the middle of the linkage rod 15 drives the bottom air plate 8, the upper end drives the baffle 14, the bottom air plate 8 moves upwards, the bottom air plate 8 generates air flow which can directly aim at an electric arc, the baffle 14 is completely opened, the air can quickly flow out of the air outlet 201, and the arc extinguishing effect is improved.
Working principle:
1. when the contactor breaks small current, the elastic piece 9 stretches normally, the bottom air plate 8 does not generate gas, and the gas directly enters the arc extinguishing chamber; the first magnetic blowing mechanism and the second magnetic blowing mechanism are used for extinguishing small-current electric arcs, electromagnetic coils with opposite magnetic potential generate magnetic fields in the same direction according to the current intensity, and the magnetizer 4 is used for enabling the middle of the magnetic field at the gap space between the arc extinguishing grid sheet 3 and the contact to be weaker and enabling the two sides of the magnetic field to be stronger, so that the electric arcs are lengthened and guided to the arc extinguishing grid sheet 3 to be extinguished;
2. when the contact breaks large current, the temperature in the arc-extinguishing chamber rises, gas generating materials generate a large amount of gas when being heated by high temperature, two groups of side gas plates 7 generate gas at the side parts of the arc-extinguishing grid plates 3, the upper surface of a bottom gas plate 8 generates gas from bottom to top, an electric arc is guided into the arc-extinguishing grid plates 3 by the magnetic field of an electromagnetic coil from the bottom gas plate 8, the gas generated by the bottom gas plate 8 can help the electric arc to enter the arc-extinguishing grid plates 3, and the gas of the side gas plates 7 enables the electric arc to stay at the arc-extinguishing grid plates 3, so that the large electric arc is lengthened and extinguished;
3. when the movable contact 6 and the fixed contact 5 are suddenly disconnected, the movable contact rotates leftwards and drives the telescopic rod 16 to move leftwards, the telescopic rod 16 drives the protruding part A17 to rotate, the protruding part A17 drives the rotating part 19 to rotate, so that the protruding part B18 rotates rightwards, the linkage rod 15 rotates rightwards along with the protruding part B18, the middle of the linkage rod 15 drives the bottom air plate 8, the upper end drives the baffle 14, the bottom air plate 8 moves upwards, air flow generated by the bottom air plate 8 can be directly aligned with an electric arc, and the baffle 14 is completely opened, so that the air can quickly flow out of the air outlet 201;
4. when breaking large current, there is part of electric arc to fly out from the air inlet hole 121, the wire netting 11 intercepts the flashover for the first time, the insulating partition 13 gathers the electric arc at the wire netting 11, and the electric arc is blocked at the wire netting 11, the electric arc is intercepted by the baffle 20 after flying out of the wire netting 11, and the air flow in the shell 2 can flow out from the air outlet hole 201 normally.
It is noted that in this document, relational terms such as front, back, upper, lower, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and the present application is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present application has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (6)
1. The utility model provides a take contactor of reinforcing magnetic field direction explosion chamber, includes contactor body (1), casing (2) and explosion chamber, set up a plurality of arc extinguishing bars piece (3) in the explosion chamber, contactor body (1) set up a plurality of contacts, and the contact can act for separating brake and closing a floodgate, and leave the clearance with arc extinguishing bars piece (3), contactor body (1) and explosion chamber set up in casing (2), its characterized in that: the contactor body (1) further comprises a first magnetic blowing mechanism and a second magnetic blowing mechanism, the first magnetic blowing mechanism comprises two groups of magnetizers (4) symmetrically arranged on the outer side of the shell (2) and positioned on two sides of the arc extinguishing grid sheet, the second magnetic blowing mechanism comprises two groups of electromagnetic coils, the two groups of electromagnetic coils are connected with the contact in parallel, and the two groups of electromagnetic coils are arranged on two sides of the contact side by side and generate opposite magnetic potential;
the contact comprises a fixed contact (5) and a moving contact (6), the moving contact (6) comprises a plurality of spiral contacts (601) and an action part (602), the action part (602) is movably connected to the contactor body (1), the action part (602) extends to form a cantilever and is provided with the spiral contacts (601), and a plurality of cambered surface grooves (501) which are in one-to-one correspondence with the spiral contacts (601) are formed at the joint of the fixed contact (5) and the moving contact (6);
the spiral contacts (601) are multiple and are arranged at equal intervals, the spiral contacts (601) are cones, spiral linear grooves are formed in the side faces of the spiral contacts, the cambered surface grooves (501) are hemispherical, the fixed contact (5) is in point contact with the moving contact (6), and after any one or more spiral contacts (601) are in contact with the cambered surface grooves (501), the fixed contact (5) is communicated with the moving contact (6);
the contactor body (1) further comprises a gas generating mechanism, the gas generating mechanism comprises two groups of side gas plates (7) which are perpendicular to the arc-extinguishing grid plates (3) and are arranged on two sides of the arc-extinguishing grid plates (3) and a group of bottom gas plates (8) which are arranged at the lower ends of the arc-extinguishing grid plates (3), and gas generating materials are arranged on the inner surfaces of the side gas plates (7) and the upper surfaces of the bottom gas plates (8);
the gas generating mechanism further comprises an elastic piece (9) and a rotating shaft (10), two ends of the rotating shaft (10) are hinged to the shell (2), one end of the bottom gas plate (8) penetrates through the rotating shaft (10), and the other end of the bottom gas plate is arranged at the lower end of the arc extinguishing grid plate (3) in a suspending mode; one end of the elastic piece (9) is fixed on the shell (2) and is positioned on the upper side of the rotating shaft (10), the other end of the elastic piece is fixed on the upper side of one end, far away from the rotating shaft (10), of the bottom air plate (8), and the elastic piece (9) can expand and extrude the bottom air plate (8) when being heated, so that the bottom air plate (8) rotates downwards along the rotating shaft (10).
2. The contactor with enhanced magnetic field directed arc chute as in claim 1 wherein: the arc extinguishing grid plates (3) are sheet-shaped, a herringbone concave edge is formed from the bottom to the top, a plurality of supporting blocks (301) are protruded from two sides of the arc extinguishing grid plates, and the side air plates (7) are provided with mounting grooves matched with the supporting blocks (301); and the gas generating material is coated on the area of the side gas plate (7) between the supporting blocks (301) of the two adjacent arc extinguishing grid plates (3), and the contact part of the side gas plate (7) and the arc extinguishing grid plates (3) is a non-gas generating material area.
3. A contactor with enhanced magnetic field directed arc chute as in claim 2 wherein: the arc extinguishing chamber further comprises an iron wire mesh (11), a middle plate (12), an insulating partition plate (13) and a baffle plate (14), wherein the middle plate (12) is arranged at the upper end of the arc extinguishing grid plates (3), a plurality of air inlet holes (121) are vertically formed in the middle plate (12) between every two arc extinguishing grid plates (3), a plurality of side holes (122) are formed in the middle plate at equal intervals in the transverse direction, and the side holes (122) are communicated with the air inlet holes (121); the wire netting (11) is arranged at the upper end of the middle plate (12) and is formed by combining a plurality of metal wires which are alternately connected in a longitudinal and transverse mode; the insulating partition plate (13) is annular and is arranged at the upper end of the wire netting (11), and the insulating partition plate (13) is in contact with the upper end of the shell (2); a plurality of air outlet holes (201) are formed in the upper end of the shell (2), the baffle (14) is arranged below the air outlet holes (201), two ends of the baffle are hinged to the upper end of the shell (2) in an interference mode, the baffle can transversely rotate relative to the shell (2), a handle is arranged at the upper end of the baffle (14) in a protruding mode, and the handle is used for manually adjusting the inclination angle of the baffle (14).
4. A contactor with enhanced magnetic field directed arc chute as in claim 3 wherein: a linkage device is arranged between the moving contact (6) and the arc extinguishing chamber, the linkage device comprises a cam, a linkage rod (15) and a telescopic rod (16), the cam comprises a protruding part A (17), a protruding part B (18) and a rotating part (19), and the protruding part A (17) and the protruding part B (18) are protruding on the rotating part (19) and are centrosymmetric; one end of the telescopic rod (16) is fixedly connected with the movable contact (6), the other end of the telescopic rod is hinged with the bulge A (17), the rotating part (19) is hinged on the shell (2), the lower end of the linkage rod (15) is hinged on the bulge B (18), the middle of the linkage rod is hinged with one side, far away from the rotating shaft (10), of the bottom air plate (8), the upper end of the linkage rod (15) is hinged with the upper end of the baffle plate (14), and the bulge A (17) and the bulge B (18) can enable the linkage rod (15) and the telescopic rod (16) to rotate in opposite directions; the linkage is arranged on the inner side of the shell (2).
5. The contactor with enhanced magnetic field directed arc chute as in claim 4 wherein: the arc extinguishing chamber further comprises a baffle plate (20), the baffle plate (20) is arranged between the baffle plate (14) and the insulating baffle plate (13), is positioned below the baffle plate (14), vertically penetrates through a plurality of interception holes, and the projection position of the interception holes in the vertical direction does not cover the air inlet holes (121) and the air outlet holes (201).
6. The contactor with enhanced magnetic field directed arc chute as in claim 5 wherein: the magnetizer (4) is sheet-shaped, one end of the magnetizer is wide, one end of the magnetizer is narrow, the magnetizer is fixed on the outer side of the shell (2) and covers the gap between the arc extinguishing grid sheet (3) and the contact, the outer side of the shell (2) is inwards concave to form a slot matched with the magnetizer (4) in shape, the magnetizer (4) is inserted into the slot from the wide end, and the magnetizer (4) is flush with the outer surface of the shell (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210015607.1A CN114360966B (en) | 2022-01-07 | 2022-01-07 | Contactor with enhanced magnetic field guiding arc extinguishing chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210015607.1A CN114360966B (en) | 2022-01-07 | 2022-01-07 | Contactor with enhanced magnetic field guiding arc extinguishing chamber |
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| CN114360966A CN114360966A (en) | 2022-04-15 |
| CN114360966B true CN114360966B (en) | 2023-10-13 |
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Effective date of registration: 20230914 Address after: No. 18 Xianxing Road, Xianlin Street, Yuhang District, Hangzhou City, Zhejiang Province, 310000 Applicant after: HANGZHOU MA SHI DI ELECTRICAL APPLIANCE TECHNOLOGY Co.,Ltd. Address before: 215000 No. 246, Meinan Road, Meili Town, Changshu City, Suzhou City, Jiangsu Province Applicant before: Zheng Aidi |
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