CN215933494U - DC contactor with arc extinguishing grid sheet - Google Patents

Abstract

The utility model relates to a take direct current contactor of arc extinguishing bars piece, which comprises an outer shell, be provided with the stationary contact that two intervals set up in the shell, be provided with the moving contact between two stationary contacts, one side that the moving contact was kept away from the stationary contact is fixed with the actuating lever, the one end that the actuating lever deviates from the moving contact is provided with the movable magnetic core, movable magnetic core outside cover is equipped with the coil, still the cover is equipped with the stationary magnetic core on the actuating lever, the stationary magnetic core is located between moving contact and the movable magnetic core, be provided with sealed explosion chamber in the shell, the stationary contact is worn out sealed explosion chamber to one side that is kept away from the movable magnetic core along its self axis direction, the sealed explosion chamber is worn out to one side that deviates from the stationary contact along its self axis direction to the actuating lever, be provided with the bars piece between two stationary contacts, the lateral wall fixed connection of bars piece and sealed explosion chamber, the bars piece is cut apart into the arc extinguishing chamber that two symmetries set up with sealed explosion chamber, two stationary contacts are located the corresponding arc extinguishing intracavity respectively. This application has the effect that improves sealed explosion chamber arc extinguishing ability.

Description

DC contactor with arc extinguishing grid sheet

Technical Field

The application relates to the technical field of direct current contactors, in particular to a direct current contactor with arc extinguishing grid pieces.

Background

The contactor is divided into an alternating current contactor and a direct current contactor, and the contactor is broadly characterized in that a coil flows through current to generate a magnetic field in industrial electricity, so that a contact is closed, and the effects of controlling a loaded electric appliance and protecting a circuit are achieved.

In the related art, the direct current contactor comprises a shell, two fixed contacts arranged at intervals are arranged in the shell, a movable contact used for communicating the two fixed contacts is further arranged in the shell, a driving rod is fixed on the movable contact, and a movable magnetic core is fixed on a section of the driving rod, which deviates from the movable contact. The outside of the moving magnetic core is sleeved with a coil. And a static magnetic core is arranged between the movable magnetic core and the movable contact. In actual work, a worker connects the direct current contactor into a circuit. The staff is electrified to the coil, and coil current produces the magnetic field, makes the magnetostatic core produce the electromagnetic force and adsorbs the movable magnetic core to drive the movable contact to move to the one side that is close to the stationary contact, and the movable contact communicates two stationary contacts, thereby makes the circuit intercommunication. When the circuit needs to be disconnected, a worker disconnects the current on the coil, the static magnetic core loosens to start the magnetic core, and the return spring drives the movable magnetic core to reset. In the process of separating the movable contact from the fixed contact, electrons escape from the metal surfaces of the movable contact and the electric contact due to primary electron emission, and gas atoms or molecules in the gap generate electrons and ions due to ionization. At the same time, electron or ion bombardment of the emission surface can in turn cause secondary electron emission. When the concentration of ions in the gap is sufficiently large, the gap is electrically broken down to create an arc.

In the related art, the arc is a high-temperature and high-conductivity free gas, which has a great influence on the safe operation of the power supply and distribution system. In the process of continuous disconnection and connection of the direct current contactor, the fixed contact and the movable contact are easy to burn, and the service life of the direct current contactor is influenced.

SUMMERY OF THE UTILITY MODEL

In order to improve direct current contactor's life and security, this application provides a direct current contactor of taking arc extinguishing bars piece.

The application provides a take direct current contactor of arc extinguishing bars piece adopts following technical scheme:

a direct current contactor with arc extinguishing grid pieces comprises a shell, wherein two fixed contacts arranged at intervals are arranged in the shell, a movable contact plate is arranged between the two fixed contacts, a driving rod is fixed on one side of the movable contact plate, which deviates from the fixed contacts, a movable magnetic core is arranged at one end of the driving rod, which deviates from the movable contact plate, a coil is sleeved outside the movable magnetic core, a static magnetic core is further sleeved on the driving rod and is positioned between the movable contact plate and the movable magnetic core, a sealing arc extinguishing chamber is arranged in the shell, the static contact penetrates out of the sealing arc extinguishing chamber towards one side, which deviates from the movable magnetic core, along the axis direction of the driving rod, the sealing arc extinguishing chamber is penetrated out of one side, which deviates from the static contact, of the driving rod, is in sliding fit with the sealing arc extinguishing chamber along the axis direction of the driving rod, two grid pieces are arranged between the fixed contacts, and the grid pieces are fixedly connected with the side wall of the sealing arc extinguishing chamber, the grid piece divides the sealed arc-extinguishing chamber into two arc-extinguishing chambers which are symmetrically arranged, and the two stationary contacts are respectively positioned in the corresponding arc-extinguishing chambers.

Through adopting above-mentioned technical scheme, after the staff cuts off the power supply to the coil, move magnetic core and magnetostatic core separation, drive movable contact plate and arbitrary stationary contact separation, produce electric arc. The electric arc is stranded in corresponding arc extinguishing chamber by the bars piece, and the electric arc of movable contact spring length direction both sides can't remove or buckle to one side that is close to each other, helps reducing both sides electric arc and contacts each other or collide, makes direct current contactor inside overheated, takes place the condition of burning or explosion, helps improving direct current contactor's life and security.

Preferably, the sealed explosion chamber includes the ceramic set casing, bars piece and ceramic set casing integrated into one piece, be provided with the embedded groove on the bars piece, the embedded groove wears to establish the bars piece from one side that is close to the movable magnetic core to one side that is close to the stationary contact along the movable contact plate sliding direction, the movable contact plate slides the cooperation with the embedded groove along the sliding direction of actuating lever.

Through adopting above-mentioned technical scheme, the movable contact plate slides in the embedded groove, helps further reducing the possibility that both sides electric arc contacted. The ceramic fixing shell is beneficial to enabling the temperature of the electric arc to be reduced when the electric arc contacts with the grid plate or other side walls of the ceramic fixing shell, and is beneficial to enabling the electric arc to be rapidly extinguished, so that the arc extinguishing effect of the direct current contactor is improved.

Preferably, the two grid pieces are arranged in the sealed arc extinguishing chamber at intervals along the thickness direction of the grid pieces, and the two static contacts are respectively positioned on one side of the two grid pieces, which are deviated from each other.

Through adopting above-mentioned technical scheme, two bars pieces help further separating both sides electric arc to further reduce the possibility that both sides electric arc contacted, help improving direct current contactor's arc extinguishing effect.

Preferably, a first permanent magnet is arranged in the sealed arc extinguish chamber, at least one of the two sides of the first permanent magnet, which deviate from the two stationary contacts, is arranged on each of the two sides, and a near uniform magnetic field is formed between the two first permanent magnets.

By adopting the technical scheme, when the movable contact plate is separated from any one of the fixed contacts, the electric arc is bent to one side of the width direction of the movable contact plate under the action of the ampere force in the nearly uniform magnetic field in the sealed arc extinguishing chamber, and the electric arc is elongated to a certain extent, so that the accelerated electric arc extinguishing is facilitated. Meanwhile, the arc is bent and then is contacted with the grid sheet or the ceramic fixing shell, so that the arc is cooled, and the arc extinguishing is accelerated.

Preferably, the driving rod is sleeved with an arc isolation cover, the thickness direction of the arc isolation cover is parallel to the axis direction of the driving rod, the arc isolation cover is positioned between the movable magnetic core and the first permanent magnet, and the driving rod is matched with the arc isolation cover in a sliding mode along the axis direction of the driving rod.

Through adopting above-mentioned technical scheme, separate the arc cover and help reducing the influence of first permanent magnet to moving the magnetic core, help guaranteeing to cut off the power supply after, move magnetic core and magnetostatic core separation, move the magnetic core and reset. The arc-isolating cover and the ceramic fixing shell which are arranged in a split mode facilitate the assembly of the direct current contactor by workers, meanwhile, a relatively closed space is formed by the arc-isolating cover and the ceramic fixing shell, the high-temperature high-conductivity gas escape is reduced, and the safety of the direct current contactor is improved.

Preferably, any one of the first permanent magnets is provided with a limiting groove, any one of the limiting grooves penetrates through the corresponding first permanent magnet along the same magnetic pole direction, a limiting strip which is embedded and matched with any limiting groove is integrally formed in the ceramic fixing shell, and any one of the limiting strip and the corresponding limiting groove are matched in a sliding mode along the sliding direction of the movable contact plate.

Through adopting above-mentioned technical scheme, the spacing groove makes things convenient for the staff to distinguish the magnetic pole direction of first permanent magnet with the spacing strip that corresponds the setting to make things convenient for the staff to install first permanent magnet. The possibility that a near-uniform magnetic field cannot be formed due to misjudgment of the magnetic pole direction in the installation process of workers is reduced.

Preferably, be provided with the embedded groove on the ceramic set casing, the embedded groove is located the open side of ceramic set casing, the ceramic set casing is worn to establish along one side that is close to the movable contact plate to the one side that is close to the stationary contact to the embedded groove, the embedded groove is provided with at least one in arbitrary one first permanent magnet week side.

Through adopting above-mentioned technical scheme, the embedded groove is provided with at least one at the axonometric of arbitrary first permanent magnet, helps making things convenient for the first permanent magnet of staff's dismouting.

Preferably, a second permanent magnet used for enhancing the uniform magnetic field magnetic flux is further arranged in the sealed arc extinguishing chamber, the second permanent magnet is located in the middle of a connecting line of the two first permanent magnets, and the second permanent magnet is located on the same side of the two stationary contacts.

Through adopting above-mentioned technical scheme, the second permanent magnet helps strengthening the magnetic field intensity at sealed explosion chamber middle part, improves the magnetic flux in the sealed explosion chamber. The arc extinguishing chamber is beneficial to enhancing the magnitude of ampere force applied to the electric arc in the sealed arc extinguishing chamber, thereby being beneficial to improving the arc extinguishing capability of the sealed arc extinguishing chamber.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by means of the sealed arc extinguish chamber and the grid pieces arranged in the sealed arc extinguish chamber, the sealed arc extinguish chamber is favorably divided into two arc extinguish chambers corresponding to the static contact points, electric arcs are generated in the corresponding arc extinguish chambers, the possibility of contact or collision of the two electric arcs is favorably reduced, and therefore the safety and the service life of the sealed arc extinguish chamber are favorably improved;

2. by means of the two grid pieces arranged at intervals, the possibility of arc contact at two sides is further reduced, and the arc extinguishing effect of the arc extinguishing cavities at two sides is improved;

3. the first permanent magnet is helpful for bending the electric arc by ampere force in the sealed arc extinguish chamber at the initial generation stage, so that the electric arc is contacted with the integrally formed grid sheet and the ceramic fixing shell, thereby being helpful for cooling the electric arc, accelerating the extinguishing of the electric arc and further improving the arc extinguish effect of the sealed arc extinguish chamber.

Drawings

Fig. 1 is an axial schematic view of an overall structure of a dc contactor with arc extinguishing grid pieces according to an embodiment of the present application;

fig. 2 is a cross-sectional view of an embodiment of the present application, which mainly shows an internal structure of a dc contactor with arc extinguishing grids;

FIG. 3 is an axial exploded view of the embodiment of the present application, which mainly shows the positions among the cover, the mounting frame, and the fixing frame;

FIG. 4 is a sectional view of the embodiment of the present application showing the position of the driving rod and the components thereon;

FIG. 5 is an axial schematic view of an embodiment of the present application showing primarily the position of the drive rod and the arc chute;

FIG. 6 is an axial view of the embodiment of the present application, which mainly shows the internal structure of the mounting rack;

FIG. 7 is an axial view of the embodiment of the present application, which mainly shows the internal structure of the ceramic fixing shell;

fig. 8 is a cross-sectional view of the dc contactor with arc extinguishing grids according to the embodiment of the present application.

Reference numerals: 1. a housing; 11. a housing; 12. an ear plate; 13. a cover body; 21. a static magnetic core; 22. a movable magnetic core; 221. positioning a groove; 23. a movable touch plate; 24. a stationary contact; 241. static contact; 2411. embedding a groove; 2412. sealing glue; 242. a conductive bolt; 25. an auxiliary joint; 3. a circuit protection cover; 31. an energy-saving circuit board; 4. a fixed mount; 41. a magnetic pole jacket; 411. a boss; 42. a framework; 43. a coil; 44. a guide sleeve; 5. sealing the arc extinguish chamber; 51. a mounting frame; 52. an arc-isolating shield; 521. an insertion block; 522. a positioning bar; 523. reinforcing ribs; 524. a partition plate; 53. a ceramic stationary shell; 531. a protective shell; 5311. mounting grooves; 5312. a limiting strip; 5313. a groove is embedded; 532. a grid sheet; 5321. a first avoidance slot; 5322. a second avoidance slot; 54. a sealing cover; 541. an air duct; 55. a microswitch; 6. a drive rod; 61. a first fixed section; 611. a clamping groove; 62. a first positioning section; 63. a second positioning section; 64. a second fixed section; 641. an annular neck; 71. positioning a clamp spring; 72. a return spring; 73. a first insulating pad; 74. a buffer spring; 75. a second insulating pad; 76. pressing a plate; 761. a guard plate; 762. layering; 77. a third insulating pad; 78. fixing a clamp spring; 8. a first permanent magnet; 81. a limiting groove; 9. a second permanent magnet.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses direct current contactor with arc extinguishing grid pieces.

Referring to fig. 1 and 2, the dc contactor with arc extinguishing bars comprises a housing 1, wherein a movable contact plate 23 is arranged in the housing 1, and the thickness direction of the movable contact plate 23 is parallel to the axial direction of the housing 1. The movable contact plate 23 is provided with a driving rod 6, the axial direction of the driving rod 6 is parallel to the thickness direction of the movable contact plate 23, and the driving rod 6 is in sliding fit with the shell 1 along the thickness direction of the movable contact plate 23. One end of the driving rod 6 is fixedly connected with the movable contact plate 23. One end of the driving rod 6 departing from the movable contact plate 23 is provided with a movable magnetic core 22, the outer side of the movable magnetic core 22 is sleeved with a coil 43, a static magnetic core 21 is further arranged between the movable magnetic core 22 and the movable contact plate 23, and the static magnetic core 21 is fixed in the shell 1. One side of the movable contact plate 23, which is far away from the driving rod 6 in the thickness direction, is provided with two static contacts 24, the static contacts 24 penetrate out of the shell 1 in the thickness direction of the movable contact plate 23, and the two static contacts 24 are arranged at intervals on two sides of the movable contact plate 23 in the length direction. In actual use, when the dc contactor is connected to a circuit by an operator, the coil 43 is energized, the coil 43 generates a magnetic field by a current, the static magnetic core 21 generates an electromagnetic force to attract the movable magnetic core 22, the movable contact plate 23 is pushed by the driving lever 6 to move toward the side close to the static contact 24, both sides of the movable contact plate 23 in the longitudinal direction abut against the static contacts 24 on both sides, and the circuit is connected.

Specifically, referring to fig. 1, the housing 1 includes a case 11 and a cover 13 covering the case 11, one side of the case 11 close to the cover 13 is open, and any one of the stationary contacts 24 penetrates the cover 13 in the thickness direction and is fixed to the cover 13. One side of the shell 11 departing from the cover 13 is integrally formed with two ear plates 12, and the two ear plates 12 are symmetrically arranged on two sides of the shell 11 in the axial direction. The lug plate 12 is provided with a fixing bolt for fixing the direct current contactor.

Referring to fig. 2 and 3, an energy-saving circuit board 31 is disposed at the bottom of the housing 11, the energy-saving circuit board 31 is electrically connected to the coil 43, and the energy-saving circuit board 31 includes a polarity modulation module and a PWM modulation module. The polarity modulation module is used for preventing the direct current circuit from being reversely connected and ensuring the direction of the magnetic field. The PWM module adjusts the voltage by changing the pulse duty ratio, so that the effect of saving electric energy is achieved. The energy-saving circuit board 31 is covered with the circuit protection cover 3, the circuit protection cover 3 is embedded at the bottom of the shell 11, and the circuit protection cover 3 abuts against the energy-saving circuit board 31 at the bottom of the shell 11.

One side of the circuit protection cover 3 close to the cover body 13 is provided with a fixing frame 4, and the fixing frame 4 is arranged coaxially with the shell 1. One side of the fixing frame 4 close to the cover body 13 is open. The fixing frame 4 is internally and coaxially provided with a magnetic pole outer sleeve 41, one side of the magnetic pole outer sleeve 41 departing from the cover body 13 is integrally formed with a boss 411, the boss 411 and the magnetic pole outer sleeve 41 are coaxially arranged, and the boss 411 penetrates through the bottom wall of the fixing frame 4 along the axis direction of the boss 411 and is in plug-in fit with the fixing frame 4.

The outer side of the magnetic pole jacket 41 is sleeved with a framework 42, the framework 42 and the magnetic pole jacket 41 are coaxially arranged, and the framework 42 is in sliding fit with the framework 42 along the axis direction of the framework 42. The coil 43 is wound around the bobbin 42. A guide sleeve 44 is arranged in the magnetic pole outer sleeve 41, and the guide sleeve 44 is arranged coaxially with the magnetic pole outer sleeve 41. The guide sleeve 44 is in plug-in engagement with the pole housing 41 along its own axis. One side of the guide sleeve 44 close to the cover body 13 is open, one side of the guide sleeve 44 away from the cover body 13 is abutted against one side of the circuit protection cover 3 close to the cover body 13, and one side edge of the guide sleeve 44 close to the cover body 13 is turned outwards along the radial direction of the guide sleeve and is formed with a turned edge.

One side that mount 4 is close to lid 13 is provided with mounting bracket 51, and mounting bracket 51 axis direction is parallel with mount 4 axis direction, and one side that mounting bracket 51 is close to lid 13 is open and sets up, and one side that mounting bracket 51 deviates from lid 13 supports tightly on the side that the uide bushing 44 turn-ups is close to lid 13. The static magnetic core 21 is formed on a side of the mounting bracket 51 facing away from the cover 13 in the direction of its own axis. The static magnetic core 21 is coaxially arranged with the mounting frame 51, and the static magnetic core 21 is in plug fit with the guide sleeve 44 along the direction of the axis of the static magnetic core 21.

The movable magnetic core 22 is arranged in the guide sleeve 44 in a sliding manner along the axis direction of the movable magnetic core, and the outer side wall of the movable magnetic core 22 is matched with the inner side wall of the guide sleeve 44 in a sliding manner. The guide sleeve 44 helps to ensure the sliding direction of the moving magnetic core 22 after the coil 43 is electrified. The pole wrap 41 helps to ensure that the moving core 22 moves away from the moving core 22 after the coil 43 is energized.

The driving rod 6 is coaxially arranged with the mounting frame 51, the driving rod 6 penetrates through the mounting frame 51 along the axis direction of the driving rod 6, an insertion groove is formed, and the driving rod 6 is matched with the sliding groove in a sliding mode along the axis direction of the driving rod 6.

Referring to fig. 4 and 5, the driving rod 6 is sequentially divided into a first fixing section 61, a first positioning section 62, a second positioning section 63 and a second fixing section 64 from a side close to the line protection cover 3 to a side close to the cover 13. The diameter of the first positioning section 62 is larger than that of the first fixing section 61, the diameter of the second positioning section 63 is smaller than that of the first positioning section 62, and the diameter of the second fixing section 64 is smaller than that of the second positioning section 63.

The first fixing section 61 is provided with a clamping groove 611, and the clamping groove 611 is located on one side of the movable magnetic core 22, which deviates from the mounting frame 51 in the axial direction. The movable magnetic core 22 is sleeved on the first fixing section 61, and one side surface of the movable magnetic core 22 departing from the circuit protection cover 3 abuts against one side end surface of the first positioning section 62 departing from the second positioning section 63. The first fixing section 61 is sleeved with a positioning clamp spring 71, and the positioning clamp spring 71 is in clamping fit with the clamping groove 611. One side surface of the movable magnetic core 22 departing from the cover body 13 in the axial direction is abutted against the positioning clamp spring 71. The positioning clamp spring 71 facilitates the worker to install the movable magnetic core 22 on the first fixing section 61.

An arc isolation cover 52 is further arranged in the mounting frame 51, one side of the arc isolation cover 52 in the thickness direction abuts against the bottom wall of the mounting frame 51, an insertion block 521 is formed on one side of the arc isolation cover 52 in the thickness direction, which deviates from the cover body 13, the insertion block 521 is coaxially arranged with the mounting frame 51, and the insertion block 521 is in insertion fit with the insertion groove along the axis direction of the insertion block 521. The first positioning segment 62 penetrates the arc-isolating shield 52 along its own axial direction and is slidably engaged with the arc-isolating shield 52 along its own axial direction.

The first positioning section 62 is further sleeved with a return spring 72, and the return spring 72 is coaxially arranged with the movable magnetic core 22. A positioning groove 221 is formed at one side of the movable magnetic core 22 close to the cover 13 in the axial direction, and the positioning groove 221 penetrates through the movable magnetic core 22 along the axial direction of the movable magnetic core 22 and faces away from the cover 13. One end of the return spring 72 abuts against the bottom wall of the positioning groove 221, and one end of the return spring 72 facing away from the movable magnetic core 22 abuts against one side surface of the plugging block 521 facing away from the cover 13. In actual operation, when the coil 43 is energized, the moving magnetic core 22 moves to a side close to the static magnetic core 21 in the guide sleeve 44 and is attracted to the static magnetic core 21, and the moving magnetic core 22 and the arc shielding cover 52 compress the return spring 72. When the coil 43 is de-energized, the magnetic field on the stationary core 21 disappears and the return spring 72 rebounds, thereby driving the movable core 22 to return.

The movable contact plate 23 is sleeved on the second positioning section 63, and the movable contact plate 23 is matched with the second positioning section 63 in a sliding manner along the thickness direction of the movable contact plate 23. The second positioning section 63 is sleeved with a first insulating pad 73, and one side of the first insulating pad 73 in the thickness direction abuts against one side end face of the first positioning section 62 departing from the first fixing section 61. The second positioning section 63 is further sleeved with a buffer spring 74, the buffer spring 74 and the second positioning section 63 are coaxially arranged, one end of the buffer spring 74 abuts against one side of the first insulating pad 73 departing from the arc-isolating cover 52 in the thickness direction, and one end of the buffer spring 74 departing from the movable magnetic core 22 abuts against one side of the movable contact plate 23 close to the movable magnetic core 22 in the thickness direction. In actual work, when coil 43 is electrified, static magnetic core 21 adsorbs moving magnetic core 22, and moving magnetic core 22 drives actuating lever 6 and moves to one side that is from away from magnetic pole overcoat 41 to promote moving touch panel 23 butt on stationary contact 24, when moving touch panel 23 and stationary contact 24 butt, first location section 62 promotes first insulating pad 73 compression buffer spring 74, thereby helps reducing the thrust of moving touch panel 23 to stationary contact 24, helps protecting moving touch panel 23 and stationary contact 24, improves dc contactor's life.

The second fixing section 64 is sleeved with a second insulating pad 75, the thickness direction of the second insulating pad 75 is parallel to that of the second fixing section 64, and one side, close to the movable contact plate 23, of the thickness direction of the second insulating pad 75 abuts against one side end face, deviating from the first positioning section 62, of the second positioning section 63 in the axial direction. The second fixing section 64 is further sleeved with a pressing plate 76, and one side of the pressing plate 76 close to the movable magnetic core 22 in the thickness direction abuts against the second insulating pad 75. A third insulating pad 77 is disposed on a side of the pressing plate 76 facing away from the movable magnetic core 22 in the thickness direction, and the third insulating pad 77 is sleeved on the second fixing section 64. The second fixing section 64 is further provided with an annular clamping groove 641, and the annular clamping groove 641 is located on a side of the second fixing section 64 away from the first fixing section 61. The second fixing section 64 is provided with a fixing clamp spring 78, the fixing clamp spring 78 is matched with the annular clamp groove 641 in a clamping manner, and one side, close to the pressing plate 76, in the thickness direction of the fixing clamp spring 78 abuts against the third insulating pad 77.

Referring to fig. 2 and 6, a ceramic fixing shell 53 is arranged on one side of the arc-isolating cover 52 away from the movable magnetic core 22, the height direction of the ceramic fixing shell 53 is parallel to the axial direction of the mounting frame 51, and one side of the ceramic fixing shell 53 close to the movable magnetic core 22 is open. The ceramic fixing shell 53 is in plug fit with the mounting frame 51 along the axial direction of the mounting frame 51. The side of the ceramic fixing shell 53 facing away from the arc-isolating cover 52 is provided with a sealing cover 54, and the side of the sealing cover 54 close to the mounting frame 51 is abutted to the mounting frame 51. One side of the cover 13 in the thickness direction abuts against a side of the sealing cover 54 in the thickness direction away from the mounting frame 51.

Referring to fig. 2, each of the fixed contacts 24 includes a fixed contact 241 and a conductive bolt 242, and the two fixed contacts 24 are symmetrically arranged along a radial direction of the housing 1 perpendicular to the length direction of the movable contact plate 23, which is described by taking the fixed contact 241 on one side as an example. The axial direction of the static contact 241 is parallel to the axial direction of the housing 1, the static contact 241 penetrates through the lid 13 and the sealing cover 54 along the axial direction thereof, and the static contact 241 penetrates through the ceramic fixing shell 53 along the axial direction thereof. Sealant 2412 is filled between the static contact 241 and the lid 13, and the sealant 2412 makes the static contact 241 and the lid 13 fixed in image pair. The conductive bolt 242 is located on one side of the static contact 241, which is away from the movable contact plate 23 in the axial direction, and the conductive bolt 242 penetrates through the static contact 241 along the axial direction and is in threaded connection with the static contact 241.

Referring to fig. 6 and 7, a sealed arc extinguishing chamber 5 is formed between the sealing cover 54 and the mounting frame 51. A first permanent magnet 8 is arranged in the sealed arc extinguish chamber 5, two ends of the first permanent magnet 8 in the length direction of the movable contact plate 23 are respectively provided with one first permanent magnet 8, and the width direction of the first permanent magnet 8 is the magnetic pole direction of the first permanent magnet 8. The magnetic pole directions of the two first permanent magnets 8 are parallel to the length direction of the movable contact plate 23. A near uniform magnetic field is formed between the two first permanent magnets 8. When the movable contact plate 23 is separated from any one of the stationary contacts 24, an arc generated between the movable contact plate 23 and the corresponding stationary contact 24 is subjected to an ampere force parallel to the width direction of the movable contact. In this way, the arc is lengthened and cooled, thereby accelerating the arc extinction.

The ceramic fixing shell 53 includes a protection shell 531, an installation groove 5311 is integrally formed on the protection shell 531, and the installation groove 5311 penetrates the ceramic fixing shell 53 from one side close to the movable magnetic core 22 to one side close to the cover 13 along the height direction of the ceramic fixing shell 53. The protective cases 531 and the mounting grooves 5311 are provided in one-to-one correspondence with the first permanent magnets 8.

An embedding groove 2411 is formed in one side of any one static contact 241, which is far away from the conductive bolt 242, and the two embedding grooves 2411 respectively penetrate through the corresponding static contact 241 along one side, which is far away from the two static contacts 241, to the side which is close to the two static contacts 241. One side of any first permanent magnet 8 departing from the movable magnetic core 22 is embedded into the corresponding embedding groove 2411, and one side of the two protective shells 531 close to each other is embedded into the corresponding embedding groove 2411. In this way, the magnetic pole spacing between the two first permanent magnets 8 is reduced, thereby improving the magnetic flux in the near uniform magnetic field and improving the sealing effect of the sealed arc extinguishing chamber 5.

A side wall of the mounting groove 5311 in the width direction is provided with a limiting strip 5312, and the length direction of the limiting strip 5312 is parallel to the height direction of the ceramic fixing shell 53. Any one first permanent magnet 8 is provided with a limiting groove 81 along one side of the magnetic pole direction of the first permanent magnet 8, the limiting groove 81 penetrates through the first permanent magnet 8 along the height direction of the first permanent magnet 8, and the limiting strip 5312 is in inserting fit with the limiting groove 81. The setting of spacing groove 81 makes things convenient for the staff to distinguish the magnetic pole direction of first permanent magnet 8, and the setting of spacing 5312 makes things convenient for the staff to install first permanent magnet 8, guarantees that two first permanent magnet 8's magnetic pole direction is the same to guarantee the arc extinguishing effect.

The protective shell 531 is provided with an insertion groove 5313, the insertion groove 5313 penetrates through the protective shell 531 along one side close to the movable magnetic core 22 to one side close to the stationary contact 24, and the insertion groove 5313 penetrates through the corresponding protective shell 531 along the length direction of the movable contact plate 23. The insertion groove 5313 is provided in plurality on any one of the protective cases 531. In the embodiment of the present application, two insertion grooves 5313 are provided at intervals in the protective case 531 in the width direction of the movable contact plate 23. The embedded groove 5313 facilitates the worker to disassemble and assemble the first permanent magnet 8.

A positioning strip 522 is integrally formed on one side surface of the arc-isolating cover 52, which faces away from the movable magnetic core 22 in the thickness direction, and the length direction of the positioning strip 522 is parallel to the length direction of the movable contact plate 23. The positioning strips 522 are inserted into the corresponding insertion grooves 5313 of the ceramic fixing shell 53, the positioning strips 522 are integrally formed on the arc isolating cover 52 corresponding to the insertion grooves 5313, and in the embodiment of the present application, two positioning strips 522 are provided.

Referring to fig. 6 and 7, the arc-isolating cover 52 is further formed with reinforcing ribs 523 on both sides along the length direction of the movable contact plate 23, and one side of the reinforcing rib 523 away from the movable magnetic core 22 abuts against a side surface of the corresponding first permanent magnet 8 close to the movable magnetic core 22. The reinforcing ribs 523 are provided at intervals on both sides of the arc blocking cover 52 in the length direction of the arc blocking cover 52, and in the embodiment of the present invention, four reinforcing ribs 523 are provided on the arc blocking cover 52.

Referring to fig. 5 and 6, a second permanent magnet 9 is further arranged in the sealed arc-extinguishing chamber 5, the second permanent magnet 9 is located in the sealed arc-extinguishing chamber 5, and the second permanent magnet 9 is located on one side of the movable contact plate 23 in the width direction. The magnetic pole direction of the second permanent magnet 9 is the same as the magnetic pole direction of the first permanent magnet 8, the structure and the installation mode of the second permanent magnet 9 are the same as those of the first permanent magnet 8, and the second permanent magnet 9 is positioned in the middle of the movable touch plate 23. The second permanent magnet 9 helps to enhance the magnetic field intensity in the sealed arc-extinguishing chamber 5 and helps to ensure the arc-extinguishing effect of the sealed arc-extinguishing chamber 5.

Referring to fig. 6 and 7, a grid 532 is further disposed in the sealed arc extinguish chamber 5, the thickness direction of the grid 532 is parallel to the length direction of the movable contact plate 23, the arc extinguish chamber is divided into two arc extinguish chambers symmetrically disposed by the grid 532, and one ends of the two stationary contacts 241 close to the movable magnetic core 22 are respectively located in the corresponding arc extinguish chambers. Two grids 532 are arranged at intervals in the ceramic arc extinguishing chamber along the thickness direction of the grids 532, and the two grids 532 are respectively positioned at two sides of the pressure plate 76 along the length direction of the movable contact plate 23. The barrier 532 helps to reduce the arc generated when the two stationary contacts 24 are separated from the movable contact plate 23 from moving to a side close to each other, and the arc comes into contact with the arc to generate a situation of burning or explosion, thereby helping to improve the safety of the dc contactor.

Referring to fig. 7 and 8, the ceramic fixing shell 53 is further provided with a first avoiding groove 5321, and the first avoiding groove 5321 penetrates through the grid 532 from one side close to the movable magnetic core 22 to one side close to the stationary contact 24 along the height direction of the ceramic fixing shell 53. The movable contact plate 23 slides in the first escape groove 5321 in the height direction of the ceramic fixed case 53.

Referring to fig. 5 and 8, one side of the pressure plate 76 in the width direction extends to the side away from the second permanent magnet 9, and a bead 762 is formed. A microswitch 55 is provided on the side of the bead 762 adjacent to the movable core 22. The driving member of the micro switch 55 is located on the side close to the stationary contact 24, and the contact of the micro switch 55 is located on the side close to the movable core 22. The microswitch 55 is embedded in the ceramic fixed case 53 from the side close to the movable contact plate 23 to the side close to the stationary contact 24. The ceramic fixing shell 53 is further provided with a second avoiding groove 5322, and the ceramic fixing shell 53 penetrates through the second avoiding groove 5322 from one side close to the movable contact plate 23 to the inside along the height direction of the ceramic fixing shell 53. The pressing plate 76 slides in the second escape groove 5322 in the height direction of the ceramic fixing case 53.

Two auxiliary connectors 26 are fixed on one side of the cover 13 away from the movable magnetic core 22, any one auxiliary connector 26 is electrically connected with the common contact of the micro switch 55, and the other auxiliary connector 26 is electrically connected with the normally closed contact of the micro switch 55. In actual operation, when the movable contact plate 23 abuts against the two fixed contacts 25, the internal circuit of the micro switch 55 is in a disconnected state, and after the movable contact plate 23 is separated from the two fixed contacts 25, the movable contact plate 23 moves to the side away from the fixed contacts 25, the pressing plate 76 abuts against the driving member of the micro switch 55, and the driving member drives the internal circuit of the micro switch 55 to be connected. Thereby connecting the two auxiliary connectors 26 to form a loop. By the mode, whether the movable contact plate 23 and the fixed contact 24 of the direct current contactor are closed or not can be conveniently judged in the process of using the direct current contactor, and the use safety is improved.

Referring to fig. 5 and 7, a separating plate 524 is further fixed on a side of the arc-isolating cover 52 facing away from the movable magnetic core 22 in the thickness direction, and one end of the separating plate 524 facing away from the arc-isolating cover 52 abuts against an insulating shell of the micro switch 55. The partition plate 524 is provided one between any adjacent two contacts of the micro switch 55. The divider plate 524 helps to reduce the impact of the micro-switch 55 from the arc within the sealed arc chute 5, particularly when the circuit within the micro-switch 55 is open or closed without the impact of other external forces.

Referring to fig. 5 and 8, the pressing plate 76 extends along both sides of the movable contact 23 in the width direction to a side close to the movable core 22, and is formed with a guard plate 761, and the guard plate 761, the pressing plate 76 and the bead 762 are integrally formed. The guard 761 helps to ensure the stability of the pressing plate 76 on the driving rod 6, and helps to reduce the possibility that the pressing plate 76 is deformed or separated from the driving rod 6 due to the frequent external force applied to the end of the pressing plate 762 away from the pressing plate 76.

Referring to fig. 3, the sealing cover 54 is further provided with an air duct 541, an axial direction of the air duct 541 is parallel to a thickness direction of the sealing cover 54, and the air duct 541 penetrates through the sealing cover 54 along the axial direction thereof and is fixedly connected with the sealing cover 54. The one end that air duct 541 deviates from cover body 13 communicates with the inner side of sealed arc-extinguishing chamber 5, so that the worker can conveniently vacuumize sealed arc-extinguishing chamber 5, and meanwhile, inert gas is filled into sealed arc-extinguishing chamber 5, which is helpful for further improving the safety of the direct current contactor.

The implementation principle of the direct current contactor with the arc extinguishing grid pieces in the embodiment of the application is as follows: the operator connects the two stationary contacts 24 into the circuit and energizes the coil 43. The coil 43 generates a magnetic field by the current, and the static magnetic core 21 generates an electromagnetic force to attract the movable magnetic core 22, and the driving lever 6 pushes the movable contact plate 23 to move toward the side close to the stationary contact 24, so that both sides of the movable contact plate 23 in the longitudinal direction are respectively abutted against the stationary contacts 24 on both sides, and the circuit is connected. When the circuit needs to be disconnected, the current of the coil 43 is closed, the reset spring 72 rebounds to drive the driving rod 6 to move towards one side departing from the shell 11, the movable contact plate 23 and any one of the fixed contacts 24 are separated to generate electric arcs, the electric arcs are bent towards one side under the action of a near uniform magnetic field in the sealed arc extinguish chamber 5, the electric arcs are lengthened and contact with the side wall of the ceramic fixing shell 53, the electric arcs can be lengthened to a certain degree through the mode, the electric arcs are cooled, the electric arcs are extinguished in an accelerating mode, the service life of the direct current contactor is prolonged, and the safety is improved. And the grid plate 532 arranged in the sealed arc extinguish chamber 5 separates the two static contacts 24 in the two arc extinguish chambers, which helps to reduce the possibility of arc contact or collision at two sides, thereby helping to improve the safety of the direct current contactor.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a take direct current contactor of arc extinguishing bars piece, includes shell (1), be provided with stationary contact (24) that two intervals set up in shell (1), two be provided with movable touch panel (23) between stationary contact (24), one side that movable touch panel (23) deviate from stationary contact (24) is fixed with actuating lever (6), the one end that actuating lever (6) deviate from movable touch panel (23) is provided with movable magnetic core (22), it is equipped with coil (43) to move magnetic core (22) outside cover, it is equipped with still to overlap on actuating lever (6) quiet magnetic core (21), quiet magnetic core (21) are located movable touch panel (23) and move between magnetic core (22), its characterized in that: be provided with sealed explosion chamber (5) in shell (1), sealed explosion chamber (5) are worn out to one side of keeping away from movable magnetic core (22) along its self axis direction in stationary contact (24), sealed explosion chamber (5) are worn out to one side of keeping away from stationary contact (24) along its self axis direction in actuating lever (6), cooperation, two slide along its self axis direction and sealed explosion chamber (5) in actuating lever (6) be provided with grid piece (532) between stationary contact (24), the lateral wall fixed connection of grid piece (532) and sealed explosion chamber (5), grid piece (532) will seal the arc extinguishing chamber that explosion chamber (5) cut apart into two symmetries and set up, two stationary contact (24) are located the arc extinguishing chamber that corresponds respectively.

2. The dc contactor with arc chute of claim 1, wherein: sealed explosion chamber (5) are including ceramic set casing (53), grid piece (532) and ceramic set casing (53) integrated into one piece, be provided with embedded groove (5313) on grid piece (532), embedded groove (5313) wear to establish grid piece (532) along one side that moving touch panel (23) slip direction is close to one side of stationary contact (24) from being close to moving magnetic core (22), the cooperation of sliding of the slip direction of actuating lever (6) is followed with embedded groove (5313) to moving touch panel (23).

3. The dc contactor with arc chute according to claim 2, wherein: grid piece (532) are provided with two along its self thickness direction interval in sealed explosion chamber (5), two stationary contact (24) are located one side that two grid pieces (532) deviate from each other respectively.

4. The dc contactor with arc chute according to claim 2, wherein: be provided with first permanent magnet (8) in sealed explosion chamber (5), first permanent magnet (8) respectively are provided with at least one, two in the both sides that two stationary contacts (24) deviate from each other be formed with nearly even strong magnetic field between first permanent magnet (8).

5. The dc contactor with arc chute of claim 4, wherein: the cover is equipped with at a distance from arc cover (52) on actuating lever (6), it is parallel with actuating lever (6) axis direction to separate arc cover (52) thickness direction, quiet magnetic core (21) are located and separate one side that arc cover (52) are close to movable magnetic core (22), actuating lever (6) along its self axis direction with separate arc cover (52) cooperation of sliding.

6. The dc contactor with arc chute of claim 5, wherein: it is arbitrary all be provided with spacing groove (81) on first permanent magnet (8), arbitrary spacing groove (81) are worn to establish along the same magnetic pole direction and are corresponded first permanent magnet (8), integrated into one piece has and inlays with arbitrary spacing groove (81) and establish complex spacing strip (5312), arbitrary in ceramic set casing (53) spacing strip (5312) with correspond spacing groove (81) along the cooperation of sliding of movable contact plate (23) direction.

7. The dc contactor with arc chute of claim 6, wherein: be provided with embedded groove (5313) on ceramic set casing (53), embedded groove (5313) are located the open side of ceramic set casing (53), ceramic set casing (53) are worn to establish along one side that is close to movable contact plate (23) to one side that is close to stationary contact (24) to embedded groove (5313), embedded groove (5313) are provided with at least one in arbitrary one first permanent magnet (8) week side.

8. The dc contactor with arc chute of claim 7, wherein: still be provided with second permanent magnet (9) that are used for strengthening even high magnetic field magnetic flux in sealed explosion chamber (5), second permanent magnet (9) are located the middle part of two first permanent magnet (8) lines, second permanent magnet (9) are located the homonymy of two stationary contacts (24).

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