CN212934437U

CN212934437U - Arc extinguishing device of direct current contactor

Info

Publication number: CN212934437U
Application number: CN202022168076.9U
Authority: CN
Inventors: 李闻斌; 陈贤平; 程恒
Original assignee: Shenzhen Youlitong New Energy Technology Co ltd
Current assignee: Shenzhen Youlitong New Energy Technology Co ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-04-09
Anticipated expiration: 2030-09-28

Abstract

The utility model discloses a direct current contactor arc control device, including casing and fixed iron core, the inside arc extinguishing chamber that is equipped with of casing of fixed iron core top, the inside heat dissipation chamber that is equipped with of casing of fixed iron core below, it has the axis to cross on the iron core perpendicularly, centraxonial bottom is extended to heat dissipation intracavity portion and is equipped with and moves the iron core, move the iron core and decide and be equipped with counter-force spring between the iron core, the casing internally mounted who moves the iron core outside has solenoid, and solenoid's outside cover is equipped with the metal cup. The utility model discloses a be equipped with the block on moving the iron core to be equipped with annular rib on the block, utilize block increase magnetic pole vamp, and then reduce actuation voltage, annular rib's use has been avoided because the drawback that increases magnetic pole vamp reduces the release voltage value makes and has certain contact gap between the iron core actuation back and the quiet iron core, reduces the magnetic flux after the actuation, and then improves the release voltage value.

Description

Arc extinguishing device of direct current contactor

Technical Field

The utility model relates to a direct current contactor technical field specifically is a direct current contactor arc control device.

Background

The dc contactor is a contactor used in a dc circuit, and is mainly used for controlling a dc circuit (a main circuit, a control circuit, an excitation circuit, and the like). The dc contactor needs to frequently switch a large load current, so it must have a strong arc extinguishing capability, and a flexible contact system and a reliable electromagnetic system.

At present, on the one hand, an internal straight-through movable iron core of the existing direct current contactor has overlarge attraction voltage due to the undersize of a magnetic pole shoe surface, and the problem of the undersize of the release voltage after the attraction is in place, so that the production difficulty is caused, the product waste rate is high, on the other hand, in the process from the connection to the disconnection of a movable contact and a static contact, a discharge phenomenon and an electric arc are generated, generally, the direct current contactor is in a structure with two permanent magnetic steels, but the direct current contactor is limited by the appearance size of a product, the appearance size of the magnetic steels is small, the magnetic induction intensity generated by the magnetic steels is small, the arc extinguishing effect is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a direct current contactor arc control device to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an arc extinguishing device of a direct current contactor comprises a shell and a fixed iron core, wherein an arc extinguishing cavity is arranged inside the shell above the fixed iron core, a heat dissipation cavity is arranged inside the shell below the fixed iron core, a central shaft is vertically inserted into the fixed iron core, the bottom end of the central shaft extends into the heat dissipation cavity and is sleeved with a movable iron core, a counter force spring is arranged between the movable iron core and the fixed iron core, an electromagnetic coil is arranged inside the shell outside the movable iron core, a metal cup is sleeved outside the electromagnetic coil, the top end of the central shaft extends into the arc extinguishing cavity and is vertically connected with a movable contact spring, a pair of fixed contacts are symmetrically arranged at the top ends inside the shell at two sides right above the movable contact spring, a pair of magnetic steels I are symmetrically arranged at the top ends of the fixed iron cores at two ends of the movable contact spring, a cover cap is connected to one end of the, and the end face of the cap, which is far away from one end of the movable iron core, is provided with an annular rib, the top of the movable contact piece between the two fixed contacts is provided with a connecting plate, a second magnetic steel is embedded in the middle position of the top of the connecting plate, a movable arc extinguishing sleeve is fixed on the outer side of the connecting plate, a fixed arc extinguishing sleeve is vertically and downwardly installed at the top end of the inside of the shell on the outer side of the movable arc extinguishing sleeve, and the fixed arc extinguishing sleeve and the movable arc extinguishing sleeve.

Preferably, the cross section of the annular rib is in a regular triangle shape, the width of the annular rib is 0.1mm, and the height of the annular rib is 0.05 mm.

Preferably, the movable arc extinguishing sleeve and the fixed arc extinguishing sleeve are both in a double-layer grid net shape, the diameter of the movable arc extinguishing sleeve and the diameter of the fixed arc extinguishing sleeve are larger than the distance between the diameters of the magnetic steels on the two sides, and the movable arc extinguishing sleeve and one end of the fixed arc extinguishing sleeve are provided with openings for being mutually spliced and used.

Preferably, the shell is equipped with the flange on the casing inside wall of deciding the iron core below, the upper surface of flange is laminated mutually with the lower surface of deciding the iron core, and is equipped with the equidistant through-hole of having arranged of round along the casing circumferencial direction on the flange in deciding the iron core outside.

Compared with the prior art, the beneficial effects of the utility model are that: the arc-extinguishing device of the direct current contactor is characterized in that a cover cap is arranged on a movable iron core, an annular rib is arranged on the cover cap, the cover cap is used for increasing the pole shoe surface, so that the attraction voltage is reduced, the defect that the release voltage value is reduced due to the increase of the pole shoe surface is overcome by using the annular rib, a certain contact gap exists between the attracted movable iron core and a static iron core, the magnetic flux after attraction is reduced, so that the release voltage value is improved, the magnetic force between two adjacent magnetic steels is increased by using the second magnetic steel arranged between the first magnetic steels on two sides and reducing the distance of the magnetic force between the first magnetic steels through arranging the second magnetic steel on the two sides on a connecting plate, so that the arc-extinguishing effect is improved, the flange is arranged, on the one hand, the stability of the position of the fixed iron core is improved by using the flange, so that the stability of the whole inside of the arc-extinguishing device is improved, and, the heat that produces in the convenient to use circulation of balancing each other, the heat dissipation of being convenient for, avoid the inside local heat of device too high, through be equipped with fixed arc extinguishing cover and activity arc extinguishing cover respectively at arc extinguishing chamber position, and arrange into the bilayer structure of crisscross interlude each other with fixed arc extinguishing cover and activity arc extinguishing cover, bilayer structure's arc extinguishing cover has increased the arc extinguishing cover and has divided the branch effect to the how long of producing electric arc, be convenient for utilize the arc extinguishing cover to carry out the heat transfer heat dissipation, on the other hand activity arc extinguishing cover is along with movable contact circular telegram activity and is gone up and down to move, do not need extra drive power, do not occupy the device volume, and the arc extinguishing in-process cooperatees with fixed arc extinguishing cover and can also play the effect that the activity cut off the arc extinguishing.

Drawings

Fig. 1 is a schematic front view of the internal structure of the present invention;

FIG. 2 is a schematic top view of the connection plate of the present invention;

fig. 3 is a schematic view of the three-dimensional structure of the movable iron core of the present invention.

In the figure: 1. static contact; 2. a connecting plate; 3. a movable arc extinguishing sleeve; 4. fixing an arc extinguishing sleeve; 5. an arc extinguishing chamber; 6. a counter-force spring; 7. capping; 8. a through hole; 9. a middle shaft; 10. a metal cup; 11. a heat dissipation cavity; 12. a housing; 13. an electromagnetic coil; 14. a movable iron core; 15. a flange; 16. fixing an iron core; 17. magnetic steel I; 18. a movable contact spring; 19. a second magnetic steel; 20. annular ribs.

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 work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides an embodiment: an arc extinguishing device of a direct current contactor comprises a shell 12 and a fixed iron core 16, an arc extinguishing chamber 5 is arranged inside the shell 12 above the fixed iron core 16, a heat dissipation chamber 11 is arranged inside the shell 12 below the fixed iron core 16, a flange 15 is arranged on the shell 12 inside wall of the shell 12 below the fixed iron core 16, the upper surface of the flange 15 is attached to the lower surface of the fixed iron core 16, a circle of through holes 8 are uniformly arranged on the flange 15 outside the fixed iron core 16 along the circumferential direction of the shell 12 at equal intervals, a central shaft 9 is vertically inserted on the fixed iron core 16, the bottom end of the central shaft 9 extends into the heat dissipation chamber 11 and is sleeved with a movable iron core 14, a counter force spring 6 is arranged between the movable iron core 14 and the fixed iron core 16, an electromagnetic coil 13 is arranged inside the shell 12 outside the movable iron core 14, a metal cup 10 is sleeved outside the electromagnetic coil 13, the top end of the central shaft, a pair of static contacts 1 are symmetrically arranged at the top ends of the inner parts of the shell 12 at two sides right above the movable contact piece 18, a pair of first magnetic steels 17 are symmetrically arranged at the top ends of the fixed iron cores 16 at two ends of the movable contact piece 18, one end of the movable iron core 14 is connected with a cover cap 7, the diameter of one end of the cover cap 7 far away from the movable iron core 14 is larger than that of the movable iron core 14, an annular rib 20 is arranged on the end surface of one end of the cover cap 7 far away from the movable iron core 14, the section of the annular rib 20 is regular triangle, the width of the annular rib 20 is 0.1mm, the height of the annular rib is 0.05mm, a connecting plate 2 is arranged at the top part of the movable contact piece 18 between the two static contacts 1, a second magnetic steel 19 is embedded at the middle position of the top part of the connecting plate 2, a movable arc extinguishing sleeve 3 is fixed at the outer, the movable arc extinguishing sleeve 3 and the fixed arc extinguishing sleeve 4 are both in a double-layer grid net shape, the diameter of the movable arc extinguishing sleeve 3 and the diameter of the fixed arc extinguishing sleeve 4 are larger than the distance between the two sides of the magnetic steel 17, and the movable arc extinguishing sleeve 3 and one end of the fixed arc extinguishing sleeve 4 are provided with openings for being mutually spliced and used.

The working principle is as follows: when the arc extinguishing device is used for arc extinguishing, the movable contact piece 18 descends to separate from the static contacts 1 at two sides to generate electric arc, on one hand, a magnetic field is generated between the second magnetic steel 19 embedded on the connecting plate 2 and the first magnetic steel 17 fixedly arranged at two sides, the electric arc generated by power failure is eliminated, high temperature is possibly generated in the process of generating and eliminating the electric arc, the fixed arc extinguishing sleeve 4 and the movable arc extinguishing sleeve 3 in the arc extinguishing chamber have certain heat-insulating function to the generated high temperature, on the other hand, the electric arc is possibly overflowed due to the influence of magnetic arc extinguishing intensity, the fixed arc extinguishing cover 4 and the movable arc extinguishing cover 3 are contacted in the process of overflowing, the fixed arc extinguishing cover 4 and the movable arc extinguishing cover 3 which are in grid net shape are utilized to perform disjunction arc extinguishing on the electric arc, and because the movable arc-extinguishing chamber 3 also moves downwards along with the movement of the movable contact piece 18, the effect of cutting off and blocking the electric arc vertically downwards is generated, and the electric arc is better eliminated.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An arc extinguishing device of a direct current contactor comprises a shell (12) and a fixed iron core (16), wherein an arc extinguishing cavity (5) is arranged inside the shell (12) above the fixed iron core (16), a heat dissipation cavity (11) is arranged inside the shell (12) below the fixed iron core (16), a middle shaft (9) is vertically inserted into the fixed iron core (16), the bottom end of the middle shaft (9) extends into the heat dissipation cavity (11) and is sleeved with a movable iron core (14), a counter force spring (6) is arranged between the movable iron core (14) and the fixed iron core (16), an electromagnetic coil (13) is installed inside the shell (12) outside the movable iron core (14), a metal cup (10) is sleeved outside the electromagnetic coil (13), the top end of the middle shaft (9) extends into the arc extinguishing cavity (5) and is vertically connected with a movable contact spring (18), a pair of static contacts (1) is symmetrically arranged at the top ends inside the shell (12) on two sides right above the movable contact spring (18, and a pair of magnet steel I (17) is symmetrically installed on the top ends of the fixed iron cores (16) at the two ends of the movable contact spring (18), and the magnetic-energy-saving device is characterized in that: move the one end of iron core (14) and be connected with block (7), the diameter that moves iron core (14) one end is kept away from in block (7) is greater than the diameter that moves iron core (14), and is equipped with annular rib (20) on block (7) keep away from the terminal surface that moves iron core (14) one end, two movable contact (18) top between static contact (1) is equipped with connecting plate (2), connecting plate (2) top intermediate position department inlays and has magnet steel two (19), the outside of connecting plate (2) is fixed with activity arc extinguishing cover (3), fixed arc extinguishing cover (4) are installed to the vertical downwards in inside top of casing (12) in activity arc extinguishing cover (3) outside, and fixed arc extinguishing cover (4) and activity arc extinguishing cover (3) staggered arrangement each other.

2. The arc extinguishing device of the direct current contactor according to claim 1, wherein: the cross section of the annular rib (20) is in a regular triangle shape, the width of the annular rib (20) is 0.1mm, and the height of the annular rib is 0.05 mm.

3. The arc extinguishing device of the direct current contactor according to claim 1, wherein: the movable arc extinguishing sleeve (3) and the fixed arc extinguishing sleeve (4) are in a double-layer grid shape, the diameter of the movable arc extinguishing sleeve (3) and the diameter of the fixed arc extinguishing sleeve (4) are larger than the distance between the diameters of the magnetic steels (17) on the two sides, and openings used for mutual staggered insertion are formed in one end of the movable arc extinguishing sleeve (3) and one end of the fixed arc extinguishing sleeve (4).

4. The arc extinguishing device of the direct current contactor according to claim 1, wherein: decide casing (12) on casing (12) inside wall of iron core (16) below and be equipped with flange (15), the upper surface of flange (15) is laminated mutually with the lower surface of deciding iron core (16), and is equipped with the equidistant through-hole (8) of evenly having arranged of round along casing (12) circumferencial direction on deciding flange (15) in the iron core (16) outside.