CN208045411U - A high voltage DC contactor - Google Patents

Abstract

The utility model relates to a contactor technical field, concretely relates to high voltage direct current contactor, including a sealed contact cavity, the movable contact device that the contact cavity internalization set up, the fixed two stationary contacts that are provided with in the contact cavity, movable contact device are used for switching on two stationary contacts, and the contact cavity still is provided with a plurality of metal bars pieces, and is a plurality of the metal bars piece is around setting up in the both sides of the contact department of movable contact device and stationary contact, and a plurality of metal bars pieces are used for extinguishing the electric arc that produces when adsorbing movable contact device and stationary contact break-make. The utility model discloses a high voltage direct current contactor is provided with movable contact device, stationary contact and metal grid piece in sealed contact chamber, a plurality of metal grid pieces are around setting up in two outsides that movable contact device and two stationary contacts contacted, and the electric arc that produces when the metal grid piece can attract metal grid piece and stationary contact break-make reaches the effect of lengthening electric arc to increase arc extinguishing performance.

Description

A high voltage DC contactor

technical field

The utility model relates to the technical field of contactors, in particular to a high-voltage direct current contactor.

Background technique

At present, industries such as electric vehicles, charging piles, and solar photovoltaic equipment tend to adopt DC power systems above 200-750VDC. The existing DC contactor with the best performance is a sealed contactor. Although a number of related open technologies can realize switching operations under high-power loads, the number of withstand times for on-load switching is generally relatively high. Low, especially under the load conditions of 100A and 320VDC, it can only realize the working life of thousands of times, and the overload condition will obviously reduce the working life times, which seriously affects its reliability as the main power switch, causing its matching The equipment will have a very high risk of failure in the middle and late stages of use. Since DC does not have a zero-crossing point like AC, it cannot be extinguished naturally, so the arc extinguishing system of the high-voltage DC contactor directly determines the arc extinguishing ability, and the arc extinguishing ability determines the switching capacity and life of the contactor.

Contents of the invention

The purpose of this utility model is to provide a high-voltage DC contactor for the above-mentioned deficiencies in the prior art. A moving contact device, a static contact and a metal grid are arranged in a sealed contact cavity. The metal grids Surrounding the two outer sides of the moving contact device and the two static contacts, the metal grid can attract the arc generated when the metal grid is connected to the static contact, so as to achieve the effect of elongating the arc, thereby increasing the arc extinguishing performance.

The purpose of this utility model is achieved through the following technical solutions:

A high-voltage direct current contactor, comprising a sealed contact chamber, a movable contact device arranged in the contact chamber, two static contacts are fixedly arranged in the contact chamber, and the movable contact device is used to conduct the two static contacts, The contact cavity is also provided with a number of metal grids, which are arranged on both sides of the contact between the moving contact device and the static contact. arc generated when.

Wherein, the high-voltage direct current contactor further includes a sliding guide frame, the guide frame is provided with a first rib and a second rib, and the moving contact device is clamped between the first rib and the second rib .

Wherein, the first rib and the second rib are provided with a fixing piece for fixing the metal grid, and the fixing piece is provided with a slot for being clamped on the first rib or the second rib and for Fixing holes for fixing metal grids.

Wherein, both ends of the metal grid are provided with narrow ends that are interference-fitted with the fixing holes, and the metal grid is provided with a plurality of grid parts that attract arcs generated when the movable contact device and the static contact are switched on and off. The grid pieces are spaced apart from each other, and the area of the grid pieces is larger than the area of the narrow end.

Wherein, the moving contact device includes a connecting piece accommodated between the first rib plate and the second rib plate, a limiting frame arranged on the connecting piece, a moving contact piece that interferes with the bottom surface of the top and bottom of the limiting frame, and a moving contact piece arranged on the bottom surface of the limiting frame. The pressure spring between the connecting piece and the moving contact piece, the moving contact piece is used to conduct two static contacts.

Wherein, the contact surface of the movable contact piece and the pressure spring is provided with a first bump, the pressure spring is sleeved on the outside of the first bump, and the first bump is used to prevent the displacement of the upper end of the pressure spring.

Wherein, the contact surface between the connecting piece and the pressure spring is provided with a second protrusion, the second protrusion is used to prevent the displacement of the lower end of the pressure spring, and the second protrusion is arranged opposite to the first protrusion.

Wherein, the outer wall of the contact cavity is provided with a first magnet and a second magnet, and the first magnet and the second magnet are respectively located on two sides of the contact point between the moving contact piece and the two static contacts.

Wherein, the high-voltage DC contactor also includes a push assembly for driving the moving contact device to reciprocate, the push assembly includes a frame connected to the contact cavity, a coil wound outside the frame, and a yoke connected to the frame Components, the armature movably connected in the frame, the push rod installed on the armature and the return spring sleeved on the push rod, the yoke assembly is located between the static contact and the armature, one end of the push rod is connected to the armature, and the push rod The other end of the rod passes through the yoke assembly and is connected with the connecting piece, one end of the return spring is in conflict with the yoke assembly, and the other end of the return spring is in conflict with the armature.

Wherein, the high-voltage DC contactor also includes a sealing cover for sealing the contact cavity, the return spring and the armature are located in the sealing cover, the sealing cover is arranged between the armature and the skeleton, and the sealing cover is arranged on the yoke assembly. The yoke iron plate seals the open end of the sealing cover.

The beneficial effect of the utility model: when working, the arc generated when the moving contact device is connected or disconnected from the static contact is attracted by the metal grids arranged on the two outer sides in the sealed contact cavity, thereby dividing the arc into several short arcs , and at the same time achieve the purpose of extinguishing the arc under the action of the near pole voltage drop. A high-voltage DC contactor of the utility model is provided with a moving contact device, a static contact and metal grids in a sealed contact cavity, and the plurality of metal grids are arranged around the moving contact device and the two static contacts On the two outer sides of the contact, the metal grid can attract the arc generated when the metal grid is connected with the static contact, so as to achieve the effect of elongating the arc, thereby increasing the arc extinguishing performance.

Description of drawings

Utilize accompanying drawing to further illustrate the utility model, but the embodiment in the accompanying drawing does not constitute any restriction to the present utility model, for those of ordinary skill in the art, under the premise of not paying creative work, also can obtain according to following accompanying drawing Additional drawings.

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the structure of the utility model after hiding the contact cavity.

Fig. 3 is a structural schematic diagram of the utility model after hiding the contact cavity, the first magnet and the second magnet.

Fig. 4 is a structural schematic view of the pushing assembly, the sealing cover and the moving contact device of the utility model.

Fig. 5 is a schematic diagram of the assembly of the moving contact device and the guide frame of the present invention.

Fig. 6 is a schematic diagram of the assembly of the metal grid sheet and the guide frame of the present invention.

Fig. 7 is a schematic diagram of an exploded structure of the movable contact device of the present invention.

Reference signs include:

1—contact cavity; 11—moving contact device; 111—connecting piece; 1111—second bump; 112—limiting frame; 113—moving contact piece; 1131—first bump; 114—pressure spring; 12—static contact; 13—metal grid; 131—narrow end; 132—grid; 2—guiding frame; 21—first rib; 22— 23—fixed piece; 231—card slot; 232—fixed hole; 3—first magnet; 4—second magnet; 5—push assembly; 51—skeleton; 52— — coil; 53 — yoke assembly; 54 — armature; 55 — push rod; 56 — return spring; 6 — sealing cover.

Detailed ways

The utility model will be further described in conjunction with the following embodiments and accompanying drawings.

As shown in Figures 1 to 3, a high-voltage DC contactor of the present invention includes a sealed contact cavity 1, a movable contact device 11 arranged in the contact cavity 1, and a fixed contact device in the contact cavity 1. Two static contacts 12, the movable contact device 11 is used to conduct the two static contacts 12, the contact cavity 1 is also provided with a number of metal grids 13, and several metal grids 13 are arranged around the movable contact device 11 and the On both sides where the two static contacts 12 are in contact, several metal grids 13 are used to extinguish the arc generated when the movable contact device 11 is connected to the two static contacts 12 . When working, the arc generated when the movable contact device 11 is connected or disconnected from the static contact 12 is attracted by the metal grids 13 arranged on the two outer sides in the sealed contact cavity 1, so that the arc is divided into several short arcs, and at the same time The purpose of extinguishing the arc is achieved under the action of the near pole voltage drop. A high-voltage DC contactor of the present utility model is provided with a moving contact device 11, a static contact 12 and a metal grid 13 in a sealed contact cavity 1, and the plurality of metal grids 13 are arranged around the moving contact device 11 is in contact with the two static contacts 12, the metal grid 13 can attract the arc generated when the metal grid 13 and the static contacts 12 are on and off, so as to achieve the effect of elongating the arc, thereby increasing the arc extinguishing performance.

As shown in Figure 3 and Figure 6, the high-voltage DC contactor of the present invention also includes a guide frame 2 slidingly arranged, and the guide frame 2 is provided with a first rib 21 and a second rib 22, and the moving contact device 11 is clamped between the first rib 21 and the second rib 22 . The moving contact device 11 moves vertically up and down under the limitation of the first rib 21 and the second rib 22 , so that the alignment between the moving contact device 11 and the static contact 12 is more accurate.

As shown in Figure 3 and Figure 6, the first rib plate 21 and the second rib plate 22 of the present utility model are provided with a fixing piece 23 for fixing the metal grid piece 13, and the fixing piece 23 is provided for being clamped on the second The slot 231 of the first rib 21 or the second rib 22 and the fixing hole 232 for fixing the metal grid 13 . Both the first rib 21 and the second rib 22 are provided with two fixing pieces 23, the fixing pieces 23 are respectively arranged on the two ends of the first rib 21 and the second rib 22, and the two ends of the metal grating 13 are provided with The narrow end 131 with the interference fit of the fixing hole 232, preferably, the fixing piece 23 is provided with several fixing holes 232, the metal grid piece 13 is arranged laterally through the fixing hole 232, and part of the metal grid piece 13 is slightly inclined upward or downward. Therefore, the metal grid sheet 13 is arranged around the two outer sides where the movable contact device 11 is in contact with the two static contacts 12, and the middle of the metal grid sheet 13 is provided with a grid that attracts the electric arc generated when the movable contact device 11 and the static contacts 12 are switched on and off. The sheet part 132, a plurality of grid sheet parts 132 are arranged at intervals, and the area of the grid sheet part 132 is larger than that of the narrow end, so that it is easier to absorb the generated arc, and the arc extinguishing effect is better.

As shown in FIG. 3 , FIG. 6 and FIG. 7 , the moving contact device 11 of the present invention includes a connecting piece 111 accommodated between the first rib plate 21 and the second rib plate 22 , and a stopper set on the connecting piece 111 . The frame 112, the movable contact piece 113 which is in contact with the bottom surface of the top and bottom of the limit frame 112, and the pressure spring 114 arranged between the connecting piece 111 and the movable contact piece 113, the movable contact piece 113 is used to conduct two static contacts 12, The movable contact piece 113 is movably connected with the two static contacts 12 to realize the on-off of the external main circuit. The limit frame 112 is hollow, and the limit frame 112 is erected on the connector 111. The movable contact piece 113 is in close contact with the lower bottom surface of the limit frame 112 under the action of the pressure spring 114. The movable contact piece 113 and the pressure spring 114 are all arranged between the limit frame 112 and the connecting piece 111, the connecting piece 111 is accommodated between the first rib plate 21 and the second rib plate 22, and under the action of the external driving mechanism, the first rib plate 21 The movement with the second rib 22 makes the connecting piece 111 move up and down in the vertical direction, and the alignment with the static contact 12 is more accurate.

As shown in Fig. 2, Fig. 3 and Fig. 7, a first bump 1131 is provided on the contact surface between the movable contact piece 113 and the pressure spring 114 of the present utility model, and the pressure spring 114 is sleeved on the outside of the first bump 1131. The bump 1131 is used to prevent the upper end of the pressure spring 114 from being misaligned and deflected. A second bump 1111 is provided on the contacting surface of the connecting piece 111 and the compression spring 114 . The second bump 1111 is used to prevent the displacement of the lower end of the compression spring 114 . The second bump 1111 is opposite to the first bump 1131 . The pressure spring 114 is clamped between the first bump 1131 and the second bump 1111 to prevent the moving contact device 11 from being dislocated during the up and down movement process, and the pressure spring 114 can buffer the moving contact piece 113 under external driving action Excessive collision force with the static contact 12 can avoid damage to the movable contact piece 113 and increase the service life.

As shown in Figures 1 to 4, the outer wall of the contact chamber 1 of the present invention is provided with a first magnet 3 and a second magnet 4, and the first magnet 3 and the second magnet 4 are respectively located at the movable contact piece 113 and the two static magnets. Both sides of the contact point of the contact 12. When the magnetism of the first magnet 3 and the second magnet 4 are opposite, the first magnet 3 and the second magnet 4 form a magnetic field that penetrates the contact cavity 1, and the arc generated by the contact or disconnection of the moving contact piece 113 with the static contact 12 Under the action of the magnetic field, it is dispersed, elongated and blown to the metal grids 13 on both sides. Under the action of several metal grids 13, the arc is cut into several short arcs and rapidly cooled to achieve the effect of arc extinguishing. At the same time, when the first magnet 3 and the second magnet 4 are two separate magnets, the first magnet 3 and the second magnet 4 form two separate magnetic fields, and the arc is dispersed and elongated under the action of magnetic sound, thereby being Arc extinguishing. Preferably, the magnetic properties of the first magnet 3 and the second magnet 4 near each other are opposite.

As shown in Figures 1 to 4, the high-voltage DC contactor of the present invention also includes a push assembly 5 for driving the moving contact device 11 to reciprocate. The push assembly 5 includes a skeleton 51 connected to the contact cavity 1, A coil 52 wound outside the frame 51, a yoke assembly 53 connected to the frame 51, an armature 54 movably connected in the frame 51, a push rod 55 mounted on the armature 54, and a return spring 56 sleeved on the push rod 55 , the yoke assembly 53 is located between the static contact 12 and the armature 54, one end of the push rod 55 is connected to the armature 54, the other end of the push rod 55 passes through the yoke assembly 53 and is connected to the connector 111, and the return spring 56 One end is in conflict with the yoke assembly 53 , and the other end of the return spring 56 is in conflict with the armature 54 . The coil 52 wound around the frame 51 connects the current to generate magnetism and transmits it to the yoke assembly 53. The yoke assembly 53 generates an attractive force on the armature 54, so that the armature 54 drives the push rod 55 to move to the static contact 12, Make the moving contact piece 113 contact with the static contact 12, and the working circuit is connected; Separated, the working circuit is disconnected. The yoke assembly 53 includes a top yoke piece arranged between the stationary contact 12 and the armature 54, side yoke pieces arranged on both sides of the coil 52 and a bottom yoke piece arranged at the bottom of the coil 52, the yoke assembly 53 can The electromagnetic wire generated by the coil 52 is sealed inside to improve the efficiency of the electromagnet and reduce the loss of the electromagnet.

As shown in Figure 1 and Figure 4, the high voltage DC contactor of the present utility model also includes a sealing cover 6 for sealing the contact cavity 1, the return spring 56 and the armature 54 are located in the sealing cover 6, and the sealing cover 6 is set Between the armature 54 and the skeleton 51 , the sealing cover 6 is arranged on the yoke plate of the yoke 53 assembly, and the yoke plate seals the opening end of the sealing cover 6 . The sealing cover 6 is used to seal the contact cavity 1 to form a sealed space. Preferably, an inert gas is filled in the sealed space to extinguish the arc, so that the arc extinguishing effect is better.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (10)

1. a kind of high-voltage DC contactor, it is characterised in that：The contact cavity sealed including one, contact chamber body activity setting Dynamic tactile device, there are two stationary contacts for fixed setting in contact cavity, move tactile device for two stationary contacts to be connected, contact cavity Several metal grid are additionally provided with, several metal grid are compassingly set at the two of the contact position of dynamic tactile device and stationary contact Side, generated electric arc when several metal grid are for extinguishing dynamic tactile device with stationary contact break-make.

2. a kind of high-voltage DC contactor according to claim 1, it is characterised in that：The high-voltage DC contactor also wraps The leading truck of sliding setting is included, the leading truck is equipped with the first floor and the second floor, and the dynamic tactile device card is set to first rib Between plate and the second floor.

3. a kind of high-voltage DC contactor according to claim 2, it is characterised in that：First floor and the second floor It is both provided with the fixinig plate for fixing metal grid, the fixinig plate is equipped with for being arranged in the first floor or the second floor Card slot and mounting hole for fixing metal grid.

4. a kind of high-voltage DC contactor according to claim 3, it is characterised in that：The both ends of the metal grid are equipped with With the narrow end of mounting hole interference fit, metal grid be equipped with attract dynamic tactile device with when stationary contact break-make generated electric arc it is more A grid portion, multiple grid portions are intervally installed, and the area in the grid portion is more than the area of narrow end.

5. a kind of high-voltage DC contactor according to claim 2, it is characterised in that：The dynamic tactile device includes being located in Connector between first floor and the second floor, the position-limited rack for being set to connector contact at bottom surface at the top of position-limited rack Movable contact spring and the compression spring being set between connector and movable contact spring, movable contact spring is for being connected two stationary contacts.

6. a kind of high-voltage DC contactor according to claim 5, it is characterised in that：The movable contact spring is supported with compression spring Contacting surface is provided with the first convex block, and compression spring is sheathed on the outside of the first convex block, and the first convex block is for preventing compression spring upper end Dislocation offset.

7. a kind of high-voltage DC contactor according to claim 6, it is characterised in that：The connector is supported with compression spring Contacting surface is provided with the second convex block, and the second convex block is for preventing the dislocation of compression spring lower end from deviating, the second convex block and the first convex block It is oppositely arranged.

8. a kind of high-voltage DC contactor according to claim 5, it is characterised in that：The contact cavity lateral wall setting There are the first magnet and the second magnet, the first magnet and the second magnet to be located at the two of movable contact spring and two stationary contact institute contact points Side.

9. a kind of high-voltage DC contactor according to claim 2, it is characterised in that：The high-voltage DC contactor also wraps The pushing component for driving dynamic tactile device to move back and forth is included, the pushing component includes the bone being connect with contact cavity Frame, the yoke component being connect with skeleton, is movably connected on intraskeletal armature, is installed in armature the coil being set around outside skeleton Push rod and be sheathed on the resetting spring of push rod, the yoke component is between stationary contact and armature, one end of push rod and rank Iron connects, and the other end of push rod is connect across yoke component with connector, and one end and the yoke component of resetting spring contradict, and reset The other end of spring is contradicted with armature.

10. a kind of high-voltage DC contactor according to claim 6, it is characterised in that：The high-voltage DC contactor is also Include the seal closure for cavity in sealing contact, resetting spring is respectively positioned on armature in seal closure, and the seal closure is set to rank Between iron and skeleton, seal closure is set to the yoke plate of yoke component, and yoke plate seals the open end of seal closure.