CN209981114U

CN209981114U - Medium-voltage direct current contactor

Info

Publication number: CN209981114U
Application number: CN201920996926.9U
Authority: CN
Inventors: 钟积科; 傅浪; 黄炜; 罗欣宇; 万子义
Original assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: WUHAN CHANGHAI ELECTRICAL TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-01-21
Anticipated expiration: 2029-06-28

Abstract

The utility model relates to a direct current contactor technical field provides a medium voltage direct current contactor, including the arc extinguishing unit that is used for extinguishing electric arc, the arc extinguishing unit includes the explosion chamber and is used for opening or closing the hasp subassembly of explosion chamber, the explosion chamber is including two blocks of wallboards and two baffles of relative setting that set up, two wallboard and two the baffle encloses to close and forms the explosion chamber, and two press from both sides between the wallboard and be equipped with a plurality of arc extinguishing bars piece. The utility model discloses a medium voltage direct current contactor can conveniently open or close the explosion chamber through the hasp subassembly, adopts the cooperation of arc extinguishing bars piece, wallboard and baffle moreover, can overcome and use the integrated into one piece structure among the prior art, divides disconnected capacious, and the structure is complicated, defect that occupation space is big.

Description

Medium-voltage direct current contactor

Technical Field

The utility model relates to a direct current contactor technical field specifically is a medium voltage direct current contactor.

Background

At present, a direct current contactor used on an electric locomotive mainly has two types, namely an electric control type and an electromagnetic type, the electromagnetic type contactor depends on electromagnetic force as a power source, and most of electromagnetic mechanisms are direct-acting type and clapper type structures.

Generally, an arc extinguishing unit in a direct current contactor adopts an integrally formed structure, so that the breaking capacity is small, the structure is complex, the occupied space is large, and no mode for better opening or closing an arc extinguishing chamber exists; the electromagnetic driving part is mostly a U-shaped choke, the U-shaped choke is longitudinally arranged, the magnetic circuit is not well sealed, the magnetic force is lost, dust and sundries are easy to enter, the occupied space is large, and the mechanical life is short; contactor contact structure is mostly direct action type claps and closes and does not have the arc contact, and contact capacity is smaller, appears contact fusion welding easily, and the contact does not have self-cleaning ability moreover, and dust and tiny debris persist in contact surface and burn mark easily, cause the contact life-span to significantly reduce.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a medium voltage direct current contactor can solve the partial defect among the prior art at least.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: the utility model provides a medium voltage direct current contactor, is including the arc extinguishing unit that is used for extinguishing electric arc, the arc extinguishing unit includes the explosion chamber and is used for opening or closing the hasp subassembly of explosion chamber, the explosion chamber is including two blocks of wallboards and two baffles of relative setting, two wallboard and two the baffle encloses to close and forms the explosion chamber, and two press from both sides between the wallboard and be equipped with a plurality of arc extinguishing bars pieces.

Further, the locking assembly comprises a mounting frame with a cavity, the mounting frame is provided with an opening, and the mounting frame is arranged below the arc extinguish chamber and communicated with the arc extinguish chamber; the lock catch assembly further comprises an elastic lock catch which can be drawn close to the opening of the mounting frame to close the opening, and the elastic lock catch comprises a vertical section used for closing part of the opening of the mounting frame and a horizontal section used for closing the rest part of the opening of the mounting frame.

Furthermore, a first positioning shaft is clamped between the vertical section and the horizontal section of the elastic lock catch, and a traction section is arranged at the end part, far away from the vertical section, of the horizontal section of the elastic lock catch.

Furthermore, the arc extinguishing grid pieces are sequentially arranged in a staggered mode along the same direction.

The movable contact unit comprises a movable main contact and a movable arc contact, the fixed contact unit comprises a fixed main contact capable of being in contact with the movable main contact and a fixed arc contact capable of being in contact with the movable arc contact, the movable arc contact is mounted on the movable main contact, and the distance between the movable arc contact and the fixed arc contact is smaller than the distance between the movable main contact and the fixed main contact.

Further, the moving contact unit also comprises a main contact spring for pulling the moving main contact to separate from the static main contact and an arc contact spring for pulling the moving arc contact to separate from the static arc contact; the medium-voltage direct-current contactor further comprises a driving unit which is used for pushing the main contact spring to drive the movable main contact to contact the static main contact and simultaneously pushing the arc contact spring to drive the movable arc contact to contact the static arc contact.

Further, the driving unit comprises a cylindrical yoke, a movable iron core sleeved on a central shaft of the cylindrical yoke and a coil sleeved on the movable iron core, one end of the movable iron core, which is close to the movable contact unit, is provided with a counter force spring which can be pushed by the movable iron core, the other end of the movable iron core is provided with a limiting nut which can adjust or limit the stroke of the movable iron core, and the movable main contact is positioned in the advancing track of the counter force spring.

Furthermore, the moving contact unit further comprises a rotating frame capable of rotating around a rotating frame shaft, a first rotating shaft arranged on the rotating frame and a bent rod fixed on the first rotating shaft, a main contact spring is arranged between the bent rod and the rotating frame, a moving main contact is arranged above the bent rod, the driving unit is connected with the rotating frame through a connecting rod, the first rotating shaft and the rotating frame shaft are horizontally arranged, and the extending directions of the first rotating shaft and the rotating frame shaft are perpendicular to the direction of the driving force applied by the driving unit.

Further, the static contact unit comprises a fixed seat, a lower busbar arranged below the fixed seat, an upper busbar arranged above the fixed seat, a magnetic blow coil arranged above the upper busbar, an arc striking angle fixed above the magnetic blow coil, an iron core penetrating through the center of the magnetic blow coil and magnetic conductive plates arranged at two ends of the iron core, wherein one end of the upper busbar is connected with the static main contact in a pressing mode, one end of the arc striking angle is riveted with the static arc contact, a port of an enameled wire inside the magnetic blow coil is connected with the lower busbar, and the other port of the enameled wire is connected with the arc striking angle to form a series arc blow loop.

The auxiliary switch assembly comprises a support, the auxiliary switch, a second rotating shaft and a pressing plate can rotate around the second rotating shaft to trigger the auxiliary switch, and an elastic bolt is installed at the lower end of the pressing plate.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a medium voltage direct current contactor, can conveniently open or close the explosion chamber through the hasp subassembly, adopts the cooperation of arc extinguishing bars piece, wallboard and baffle moreover, can overcome and use the integrated into one piece structure among the prior art, divides the disconnected capacity little, and the structure is complicated, and occupation space is big defect.

Drawings

Fig. 1 is an exploded view of a switching-off state of a medium-voltage dc contactor according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a closing state of a medium voltage dc contactor according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a medium voltage dc contactor according to an embodiment of the present invention;

in the reference symbols: 1-base, 2-heat sink, 3-yoke, 4-limit nut, 5-elastic screw, 6-press plate, 7-support, 8-auxiliary switch, 9-mounting rack, 10-elastic lock catch, 11-positioning shaft, 12-wall plate, 13-baffle, 14-arc-extinguishing grid plate, 15-magnetic blow coil, 16-iron core, 17-fixing seat, 18-rotating rack shaft, 19-magnetic conductive plate, 20-cover plate, 21-main frame, 22-pin shaft, 23-movable iron core, 24-coil, 25-second rotating shaft, 26-small flexible connection, 27-arc striking plate, 28-arc guide plate, 29-ceramic plate, 30-arc contact spring, 31-movable main contact, 32-movable arc contact, 33-arc ignition angle, 34-static arc contact, 35-upper bus bar, 36-static main contact, 37-lower bus bar, 38-large flexible connection, 39-bent rod, 40-main contact spring, 41-first rotating shaft, 42-connecting rod, 43-rotating frame and 44-counterforce spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the embodiment of the present invention provides a medium voltage dc contactor, including the arc extinguishing unit that is used for extinguishing electric arc, the arc extinguishing unit includes the explosion chamber and is used for opening or closing the hasp subassembly of explosion chamber, the explosion chamber includes two blocks of wallboard 12 that set up relatively and two baffles 13 that set up relatively, two wallboard 12 and two baffle 13 enclose to close and form the explosion chamber, and two press from both sides between wallboard 12 and be equipped with a plurality of arc chute pieces 14. In this embodiment, the arc extinguishing unit, which is used to extinguish the arc, is composed of an arc extinguishing chamber, which may need to be opened or closed, and a locking assembly, by which the opening or closing can be very conveniently achieved. The prior art uses an integrally formed structure, has small breaking capacity, complex structure and large occupied space, and can overcome the defects through the matching of the arc-extinguishing grid plate 14, the wall plate 12 and the baffle plate 13.

The following are specific examples:

in order to optimize the above solution, please refer to fig. 1-3, the locking assembly includes a mounting bracket 9 having a cavity, the mounting bracket 9 has an opening, and the mounting bracket 9 is disposed below the arc extinguish chamber and is communicated with the arc extinguish chamber; the locking assembly further comprises an elastic lock catch 10 which can be closed towards the opening of the mounting frame 9 to close the opening, wherein the elastic lock catch 10 comprises a vertical section for closing part of the opening of the mounting frame 9 and a horizontal section for closing the rest part of the opening of the mounting frame 9. In this embodiment, optimize the above-mentioned locking assembly, elastic locking buckle 10 is fixed on an end face of mounting bracket 9, and lid elastic locking buckle 10 is the type of falling L, and its fall mouth just can close the opening of mounting bracket 9, and because it has certain elasticity, consequently only need fix its vertical section, the point portion of its horizontal segment just can support mounting bracket 9 in order to close its opening, and then closes the explosion chamber, as to how to open the explosion chamber, only need pull the horizontal segment of elastic locking buckle 10, make its upset can. Of course, in addition to this, a closing with a block piece is also possible. Preferably, the baffle 13 is fixed with the run-on plate 27, and the mounting bracket 9 is fixed with the arc guiding plate 28, and the run-on plates 27 on both sides of the arc extinguishing chamber are respectively installed above the run-on angle 33 and the arc guiding plate 28, and are arranged in a certain gap, so that the arc can enter the arc extinguishing chamber quickly.

In order to further optimize the above solution, please refer to fig. 1 to 3, a first positioning shaft is clamped between the vertical section and the horizontal section of the elastic lock catch 10, and a traction section is installed at an end of the horizontal section of the elastic lock catch 10 far away from the vertical section. In this embodiment, the first positioning shaft is arranged to perform a positioning function, and the first positioning shaft can also cooperate with the elastic latch 10 to close the arc extinguish chamber, and the traction section can be arranged to conveniently turn over the elastic latch 10.

As an optimized solution of the embodiment of the present invention, please refer to fig. 1-3, each arc extinguishing grid piece 14 is sequentially arranged along the same direction in a staggered manner. In the present embodiment, the arc-extinguishing grid pieces 14 are arranged in a staggered manner in a labyrinth manner, so that the arc can be effectively elongated and strongly cooled, and the arc can be rapidly extinguished.

As an optimization scheme of the embodiment of the present invention, please refer to fig. 1-3, the dc contactor further includes a moving contact unit and a static contact unit, the moving contact unit includes a moving main contact 31 and a moving arcing contact 32, the static contact unit includes a static main contact 36 capable of contacting the moving main contact 31 and a static arcing contact 34 capable of contacting the moving arcing contact 32, the moving arcing contact 32 is installed on the moving main contact 31, and a distance between the moving arcing contact 32 and the static arcing contact 34 is smaller than a distance between the moving main contact 31 and the static main contact 36. In this embodiment, when the switch is closed, that is, when the movable contact unit contacts the fixed contact unit, since the distance between the movable arcing contact 32 and the fixed arcing contact 34 is smaller than the distance between the movable main contact 31 and the fixed main contact 36, the contact action of the arcing contact is faster than the contact action of the main contact, the fixed arcing contact 34 will contact the movable arcing contact 32 first, and then the movable main contact 31 contacts the fixed main contact 36, so that the burning loss of the main contact can be effectively avoided.

In order to further optimize the above solution, please refer to fig. 1-3, the movable contact unit further includes a main contact spring 40 for pulling the movable main contact 31 to separate from the stationary main contact 36, and an arcing contact spring 30 for pulling the movable arcing contact 32 to separate from the stationary arcing contact 34; the medium voltage dc contactor further comprises a driving unit for pushing the main contact spring 40 to drive the moving main contact 31 to contact the stationary main contact 36 and simultaneously for pushing the arcing contact spring 30 to drive the moving arcing contact 32 to contact the stationary arcing contact 34. In the present embodiment, the springs are provided to play a role of buffering, and also to facilitate the implementation of the timing sequence of the first contact and the second contact of the arcing contact, specifically, the initial pressure and stiffness of the arcing contact spring 30 are both smaller than those of the main contact spring 40.

Further optimizing the above scheme, referring to fig. 1-3, the driving unit includes a cylindrical yoke 3, a movable iron core 23 sleeved on a central axis of the cylindrical yoke 3, and a coil 24 sleeved on the movable iron core 23, one end of the movable iron core 23 close to the movable contact unit is mounted with a reaction spring 44 which can be pushed by the movable iron core 23, the other end is mounted with a limit nut 4 which can adjust or limit a stroke of the movable iron core 23, and the movable main contact 31 is located in an advancing track of the reaction spring 44. In this embodiment, the driving is electromagnetic driving, when the coil 24 is not electrically excited, the contactor is in a normal off state, due to the action of the reaction spring 44, the movable iron core 23 pushes the rotating frame 43 to be placed in an off position, the contacts are in a separated state, the electromagnet is also in a separated state, when the contactor starts to work, the coil 24 is electrically excited, the movable iron core 23 attracts and compresses the reaction spring 44, and the movable contact unit is driven to work, and in the driving process, the stroke of the movable iron core 23 can be adjusted or limited through the limit nut 4.

As an optimization scheme of the embodiment of the present invention, please refer to fig. 1-3, the movable contact unit further includes a rotating frame 43 capable of rotating around the rotating frame shaft 18, a first rotating shaft 41 installed on the rotating frame 43 and a bent rod 39 fixed on the first rotating shaft 41, the main contact spring 40 is installed between the bent rod 39 and the rotating frame 43, the movable main contact 31 is installed above the bent rod 39, the driving unit and the rotating frame 43 are connected by a connecting rod 42, the first rotating shaft 41 and the rotating frame shaft 18 are horizontally arranged, and the extending directions of the two are perpendicular to the direction of the driving force applied by the driving unit. In the embodiment, the rotary type racket and the rotary type racket structure are adopted, so that the opening distance of the contact can be increased, the action speed of the contact is accelerated, the contact surfaces of the moving contact and the static contact can slide relatively in the connection and disconnection processes, the self-cleaning effect is achieved, the connection and disconnection capacity of the contactor can be effectively increased, and the electric service life of the contactor is prolonged. The rotating frame 43 can be mounted on the fixed seat 17 through the rotating frame shaft 18 to rotate freely, and the static main contact 36 is pressed on the upper busbar 35 through a bolt. The two ends of the connecting rod 42 are respectively connected with the movable iron core 23 and the rotating frame 43 by the pin 22.

As an optimization scheme of the embodiment of the present invention, please refer to fig. 1-3, the static contact unit further includes a fixing seat 17, a lower busbar 37 installed below the fixing seat 17, an upper busbar 35 installed above the fixing seat 17, a magnetic blow coil 15 installed above the upper busbar 35, an arc striking angle 33 fixed above the magnetic blow coil 15, an iron core 16 passing through the center of the magnetic blow coil 15, and magnetic conductive plates 19 installed at both ends of the iron core 16, one end of the upper busbar 35 is crimped with the stationary main contact 36, one end of the arc striking angle 33 is riveted with the stationary arc contact 34, a port of an enameled wire inside the magnetic blow coil 15 is connected with the lower busbar 37, and another port is connected with the arc striking angle 33 to form a series arc blow loop. In this embodiment, at the moment when the movable and static main contacts 36 are opened, the arc blowing loop is energized, the magnetic blowing coil 15 generates an upward magnetic force, and the arc generated by the current breaking is rapidly blown into the arc extinguishing chamber along the arc striking angle 33 and the arc guiding plate 28 to be extinguished.

As an optimization scheme of the embodiment of the utility model, please refer to fig. 1-3, the riveting of the lower part of the knee lever 39 has big flexible coupling 38 and little flexible coupling 26, and big flexible coupling 38 is connected with female row 37 down, and little flexible coupling 26 is connected with run-on plate 27, through the welding of solitary flexible coupling and female arranging, can make electric conductivity stronger, and the electric current that bears is bigger, and the resistance value is littleer, promotes the life at this position.

As an optimization scheme of the embodiment of the utility model, please refer to fig. 1-3, this middling pressure direct current contactor still includes auxiliary switch 8 subassembly, auxiliary switch 8 subassembly includes support 7, auxiliary switch 8, second pivot 25 of installation on support 7 and can wind second pivot 25 rotates in order to trigger auxiliary switch 8's clamp plate 6, the elastic bolt is installed to clamp plate 6 lower extreme. In this embodiment, specifically, the lower end of the pressing plate 6 is provided with the elastic screw 5 aligned with the end face of the limit nut 4, and during operation, the limit nut 4 pushes the elastic drop rod until the pressing plate 6 pushes the auxiliary switch 8 to trigger and send out a conversion signal. In the above embodiment, when the coil 24 is de-energized, the electromagnetic force disappears, the rotating frame 43 returns to the initial open position under the action of the reaction spring 44, the main contact and the arcing contact are separated in sequence, and the auxiliary switch 8 is reset.

As an optimized solution of the embodiment of the present invention, please refer to fig. 1-3, the fixing seat 17, the support 7 and the mounting rack 9 are clamped and fixed inside by the main frame 21 and the cover plate 20, and are designed into the frame structure, and only the fixing screws of each portion on both sides need to be disassembled to be taken out separately, so that the installation and maintenance of the contactor are very convenient. The second positioning shaft is inserted into the U-shaped groove of the main frame 21, and for convenience of reference in the drawings, the first positioning shaft and the second positioning shaft are both referred to as the positioning shaft 11. The frame structure also comprises a base 1 and a radiating fin 2 arranged on the base 1, and a yoke 3 is erected on the radiating fin 2. The main frame 21 and the main frame cover plate 20 are pasted with ceramic plates 29 on the inner sides.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A medium voltage direct current contactor, includes the arc extinguishing unit that is used for extinguishing electric arc, its characterized in that: arc extinguishing unit includes the explosion chamber and is used for opening or closing the hasp subassembly of explosion chamber, the explosion chamber is including two blocks of wallboards and two baffles of relative setting that set up relatively, two wallboard and two the baffle encloses to close and forms the explosion chamber, and two press from both sides between the wallboard and be equipped with a plurality of arc extinguishing bars piece.

2. A medium voltage direct current contactor as claimed in claim 1, wherein: the lock catch assembly comprises a mounting frame with a cavity, the mounting frame is provided with an opening, and the mounting frame is arranged below the arc extinguish chamber and communicated with the arc extinguish chamber; the lock catch assembly further comprises an elastic lock catch which can be drawn close to the opening of the mounting frame to close the opening, and the elastic lock catch comprises a vertical section used for closing part of the opening of the mounting frame and a horizontal section used for closing the rest part of the opening of the mounting frame.

3. A medium voltage direct current contactor as claimed in claim 2, wherein: a first positioning shaft is clamped between the vertical section and the horizontal section of the elastic lock catch, and a traction section is arranged at the end part, far away from the vertical section, of the horizontal section of the elastic lock catch.

4. A medium voltage direct current contactor as claimed in claim 1, wherein: the arc extinguishing grid pieces are sequentially arranged in a staggered mode along the same direction.

5. A medium voltage direct current contactor as claimed in claim 1, wherein: the movable contact unit comprises a movable main contact and a movable arc contact, the fixed contact unit comprises a fixed main contact and a fixed arc contact, the fixed main contact can be in contact with the movable main contact, the fixed arc contact can be in contact with the movable arc contact, the movable arc contact is arranged on the movable main contact, and the distance between the movable arc contact and the fixed arc contact is smaller than the distance between the movable main contact and the fixed main contact.

6. A medium voltage direct current contactor as claimed in claim 5, wherein: the moving contact unit also comprises a main contact spring for pulling the moving main contact to separate the moving main contact from the static main contact and an arc contact spring for pulling the moving arc contact to separate the moving arc contact from the static arc contact; the medium-voltage direct-current contactor further comprises a driving unit which is used for pushing the main contact spring to drive the movable main contact to contact the static main contact and simultaneously pushing the arc contact spring to drive the movable arc contact to contact the static arc contact.

7. A medium voltage direct current contactor as claimed in claim 6, wherein: the driving unit comprises a cylindrical yoke, a movable iron core sleeved on a central shaft of the cylindrical yoke and a coil sleeved on the movable iron core, wherein one end of the movable iron core, close to the movable contact unit, is provided with a counter force spring which can be pushed by the movable iron core, the other end of the movable iron core is provided with a limiting nut which can adjust or limit the stroke of the movable iron core, and the movable main contact is positioned in the advancing track of the counter force spring.

8. A medium voltage direct current contactor as claimed in claim 6, wherein: the moving contact unit further comprises a rotating frame capable of rotating around a rotating frame shaft, a rotating shaft arranged on the rotating frame and a bent rod fixed on the first rotating shaft, a main contact spring is arranged between the bent rod and the rotating frame, a moving main contact is arranged above the bent rod, the driving unit is connected with the rotating frame through a connecting rod, the first rotating shaft and the rotating frame shaft are horizontally arranged, and the two extending directions are perpendicular to the directions of the driving forces applied by the driving unit.

9. A medium voltage direct current contactor as claimed in claim 5, wherein: the static contact unit further comprises a fixing seat, a lower busbar arranged below the fixing seat, an upper busbar arranged above the fixing seat, a magnetic blow coil arranged above the upper busbar, an arc striking angle arranged above the magnetic blow coil, an iron core penetrating through the center of the magnetic blow coil and magnetic conductive plates arranged at two ends of the iron core, wherein one end of the upper busbar is connected with the static main contact in a pressing mode, one end of the arc striking angle is riveted with the static arc contact, a port of an enameled wire inside the magnetic blow coil is connected with the lower busbar, and the other port is connected with the arc striking angle to form a series arc blow loop.

10. A medium voltage direct current contactor as claimed in claim 1, wherein: still include the auxiliary switch subassembly, the auxiliary switch subassembly includes the support, the auxiliary switch of shelf location, second pivot and can wind the second pivot is rotated in order to trigger auxiliary switch's clamp plate, the elasticity bolt is installed to the clamp plate lower extreme.