CN109300743B

CN109300743B - DC contactor

Info

Publication number: CN109300743B
Application number: CN201810984782.5A
Authority: CN
Inventors: 党亚粮; 朱路; 汪祥余
Original assignee: Zhejiang Bsb Electrical Appliances Co ltd
Current assignee: Zhejiang Bsb Electrical Appliances Co ltd
Priority date: 2018-08-28
Filing date: 2018-08-28
Publication date: 2024-03-26
Anticipated expiration: 2038-08-28
Also published as: CN109300743A

Abstract

The invention relates to the technical field of contactors, in particular to a direct current contactor which comprises a push rod with a movable contact plate at one end and a lead column with a static contact at one end, wherein a ceramic piece is arranged in a space where the static contact is located, the ceramic piece is concaved inwards to form an arc extinguishing chamber, and the static contact and a contact part of the movable contact plate and the static contact are located in the arc extinguishing chamber. Through the setting at the ceramic part for the electric arc that produces when movable contact plate and stationary contact or break off is by high insulation and high temperature resistant ceramic part semi-closed, and then avoids electric arc to produce the influence to other parts in the contactor, moreover, ceramic part fills the space that movable contact plate is located, makes the space other material reduce, greatly reduced the production of electric arc, reduces the possibility that the contact bonding became invalid appears.

Description

DC contactor

Technical Field

The invention relates to the technical field of contactors, in particular to a direct current contactor.

Background

With the development of modern industrial technology, automation is gradually carried out in various fields, so that requirements on switching voltage and switching current of a contactor are higher and higher to ensure electric safety and output power, the contact gap of the existing contactor is smaller, and when a high-voltage alternating current, a high-voltage direct current, a large direct current motor and a low-power factor inductive load are connected, the contact of the contactor is very easy to generate bonding failure or continuous arc burning contact system failure.

An existing contactor, such as a high-voltage direct current vacuum relay with high reliability and long service life in China patent CN101677044B, discloses a vacuum cavity surrounded by a ceramic cover and a U-shaped yoke, and a ceramic insulator with good electrical insulation is arranged between a movable contact assembly and a push rod and between the movable contact assembly and an iron core. The vacuum degree in the relay cavity and the insulation degree between the movable contact point component and the push rod as well as the iron core are guaranteed, so that damage caused by the influence of high current and high voltage is reduced, and the service life of the relay is prolonged. However, the above-mentioned technical solution has the following problems:

1. the electric arc generated when the static contact and the movable contact are switched on and off can not be effectively reduced, and the temperature of the vacuum cavity of the relay is reduced;

2. the ceramic cover is easy to damage, the ceramic cover and the U-shaped yoke enclose a vacuum cavity, vacuum is not easy to keep, and bonding failure of the contact is easy to occur.

Disclosure of Invention

The invention provides the direct current contactor, which can effectively reduce the electric arc generated by the contact by arranging the ceramic piece, reduce the temperature in the contactor, better keep vacuum and cause bonding failure of the contact.

The direct current contactor comprises a push rod with a movable contact plate at one end and a lead column with a static contact at one end, wherein a ceramic piece is arranged in a space where the static contact is located, the ceramic piece is concaved inwards to form an arc extinguishing chamber, and the static contact and the contact part of the movable contact plate and the static contact are located in the arc extinguishing chamber.

Further, the ceramic piece includes first ceramic piece and second ceramic piece, the explosion chamber includes the first explosion chamber that first ceramic piece indent formed and the second explosion chamber that second ceramic piece indent formed, second explosion chamber, first explosion chamber opening are relative, movable contact plate both ends are located second explosion chamber, first explosion chamber respectively.

Further, the lead wire comprises a third ceramic piece, wherein the third ceramic piece is positioned between two lead wire posts, and the first ceramic piece and the second ceramic piece are respectively matched with the third ceramic piece and clamped at the periphery sides of the lead wire posts.

Further, the ceramic piece comprises a magnetic conduction plate provided with a positioning matching part, a positioning part is arranged on the side, close to the magnetic conduction plate, of the ceramic piece, and the positioning part is matched with the positioning matching part to limit the installation position of the ceramic piece.

Further, the positioning part is a protrusion or a groove/through hole, and the corresponding positioning matching part is a groove/through hole or a protrusion.

Further, the first ceramic piece and the second ceramic piece are respectively provided with a groove for placing the magnetic steel, the magnetic steel is placed in the opening of the groove, and a groove side wall is arranged between the magnetic steel and the arc extinguishing chamber at intervals.

Further, the magnetic steel is positioned on the same side of the fixed contact and the movable contact plate and near the two ends of the movable contact plate, and the S-N poles of the two magnetic steels are oppositely arranged.

Further, the magnetic steel is annular, and the center of the annular circle is positioned at the opposite side of the magnetic steel.

Further, including the iron cup, the ceramic part outside is equipped with the plastic mount, the plastic mount lateral wall is located the iron cup inboard, plastic mount bottom is equipped with the through-hole that is used for the terminal pin to run through, plastic mount one end is contradicted with the magnetic conduction board.

Further, the iron cup is installed in an installation cup arranged on the support, a coil, an iron core and an insulation cover are arranged in the iron cup in a matched mode at the opening end of the installation cup, and a sealing layer is arranged between the insulation cover and the port of the iron cup.

Compared with the prior art, the invention has the following beneficial effects: by arranging the ceramic piece, the electric arc generated when the movable contact plate is contacted with or disconnected from the fixed contact is semi-closed by the high-insulation and high-temperature-resistant ceramic piece, so that the influence of the electric arc on other parts in the contactor is avoided; moreover, the ceramic piece fills the space where the movable contact plate is located, so that other substances in the space are reduced, the generation of electric arcs is greatly reduced, and the possibility of contact bonding failure is reduced;

the magnetic steel is oppositely arranged on the S-N poles, so that the static contact is positioned in a larger magnetic field, and an electric arc generated by contact or disconnection of the static contact and the movable contact plate is easy to be influenced by the magnetic field to be extinguished, thereby greatly reducing the generation of the electric arc, fundamentally prolonging the service life of the contactor and increasing the use stability;

through the cooperation of magnet steel and ceramic part is last to use for the contactor hardly produces electric arc under the interference of magnetic field, even produce electric arc also can be kept apart in the explosion chamber of ceramic part, avoid the influence of electric arc to other components in the contactor inside, and the ceramic part can also avoid the influence of the high temperature around the contactor, high pressure, moist environment to the contactor inside moreover.

Drawings

FIG. 1 is a schematic cross-sectional view of a contactor structure;

FIG. 2 is a schematic view of a structure of a movable contact and a lead column;

FIG. 3 is a schematic diagram of the mating structure of the ceramic part and the movable contact plate;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a schematic diagram of a ceramic part structure;

FIG. 6 is a schematic illustration of a first ceramic part and magnetic steel structure;

fig. 7 is a schematic view of a plastic fixing structure.

Detailed Description

For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings and examples. It is to be understood that the examples are illustrative of the present invention and are not intended to be limiting.

As shown in fig. 1-7, a dc contactor comprises a support 1, wherein the support 1 is mounted in a desired fixed position by bolts or other removable or non-removable means. The support 1 is provided with an installation cup 11 with one end open, an iron cup 2 is fixedly arranged in the inner space of the installation cup 11, and the cup shape of the iron cup 2 is the same as the direction of the opening of the installation cup 11. The coil, the iron core 3, the magnetic conduction plate 5, the pushing rod 4 sleeved with a spring, the movable contact plate 41 installed at one end of the pushing rod 4 and the stationary contact end 81 at one end of the lead post 8 are installed in the iron cup 2. The push rod 4 is connected with the iron core 3 positioned at one end of the push rod 4 and the movable contact plate 41 positioned at the other end of the push rod 4, and a magnetic conduction plate 5 is arranged between the movable contact plate 41 and the iron core 3. The space where the stationary contact 81 in the iron cup 3 is located is provided with a ceramic piece 7, the ceramic piece 7 is concaved inwards to form an arc extinguishing chamber, and the stationary contact 81 and the contact part of the movable contact plate 41 and the stationary contact 81 are located in the arc extinguishing chamber.

The ceramic piece 7 comprises a first ceramic piece 71, a second ceramic piece 72 and a third ceramic piece 73, the arc extinguishing chambers comprise a first arc extinguishing chamber 711 formed by the concave of the first ceramic piece 71 and a second arc extinguishing chamber 721 formed by the concave of the second ceramic piece 72, the openings of the second arc extinguishing chamber 721 and the first arc extinguishing chamber 711 are opposite, and the two ends of the movable contact plate 41 are respectively positioned in the second arc extinguishing chamber 721 and the first arc extinguishing chamber 711. The third ceramic member 73 is located between the two lead posts 8, and the first ceramic member 71 and the second ceramic member 72 are respectively engaged with the third ceramic member 73 and clamped on the periphery of the lead post 8 above the stationary contact 81. The first ceramic member 71, the second ceramic member 72 and the third ceramic member 73 are positioned at the periphery of the contact position between the two movable contact plates 41 and the stationary contact 81. Therefore, as shown in fig. 4, when the movable contact 41 and the stationary contact 81 are brought into contact or disconnected to generate an arc 81, the arc is semi-closed by the high-insulation and high-temperature-resistant ceramic member 7 around the arc 81, and the arc does not affect other parts inside the contactor. Furthermore, the ceramic member 7 fills the space where the movable contact 41 is located, so that other substances in the space are reduced.

The ceramic member 7 is provided with a positioning portion 74 on the side close to the magnetic conductive plate 5, and a positioning mating portion 51 is provided on the magnetic conductive plate corresponding to the positioning portion. In this embodiment, the positioning portion 74 is a protrusion, and the corresponding positioning mating portion 51 is a groove. Of course, in other embodiments, the positioning portion 74 may be a groove, a through hole, or the like. The corresponding positioning portion 74 is a protrusion or other structure that is convenient for matching and positioning.

The first ceramic piece 71 and the second ceramic piece 72 are respectively provided with a groove 75 for placing the magnetic steel 6, and the magnetic steel 6 is placed in the gap between the first arc extinguishing chamber 711 and the second arc extinguishing chamber 721 from the opening of the groove 75. The magnetic steel 6 is positioned between the stationary contact 81 and the magnetic conduction plate 5 and near two ends of the movable contact plate 41, the magnetic steel 6 is annular, the center of the annular circle is positioned on the opposite side of the magnetic steel 6, and the two magnetic steel 6S-N poles are oppositely arranged. The magnetic steel 6 approaches the two ends of the movable contact plate 41 without affecting the stroke of the movable contact plate 41. The magnetic steel 6S-N poles are oppositely arranged to generate a larger magnetic field, so that the magnetic blow-out extinguishing effect is generated on the electric arc 81, the generation of the electric arc is greatly reduced, the service life of the contactor is fundamentally prolonged, and the use stability is improved. The magnetic steel 6 and the electric arc are separated by the ceramic piece 7, so that the influence of the electric arc is avoided, the magnetism of the magnetic steel is reduced, and the ceramic piece 7 cannot influence the magnetic field.

The plastic fixing frame 9 comprises side walls, a bottom and an opening end, the opening of the plastic fixing frame 9 is buckled downwards towards the direction of the ceramic piece 7, so that two side walls of the plastic fixing frame 9 are positioned between the ceramic piece 7 and the iron cup 2, a through hole for the lead column 8 to penetrate is formed in the bottom of the plastic fixing frame 9, and the opening end of the plastic fixing frame 9 is abutted to the magnetic conduction plate 5.

The installation cup 11 is provided with an insulating cover 10 in a matched mode at the opening end, and a sealing layer is arranged between the insulating cover 10 and the bottom of the iron cup port and between the insulating cover and the bottom of the plastic fixing frame 9. The sealing layer comprises an epoxy resin sealing material, and the sealing layer and the iron cup 2 form a closed cavity which can be filled with inert gas or vacuumized.

The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.

Claims

1. The direct current contactor comprises a push rod (4) with a movable contact plate (41) at one end and a lead column (8) with a static contact (81) at one end, and is characterized in that a ceramic piece (7) is arranged in a space where the static contact (81) is located, the ceramic piece (7) is concavely formed into an arc extinguishing chamber, the contact parts of the movable contact plate (41) and the static contact (81) are located in the arc extinguishing chamber, the ceramic piece (7) comprises a first ceramic piece (71) and a second ceramic piece (72), the ceramic piece (7) comprises a third ceramic piece (73), the third ceramic piece (73) is located between the two lead columns (8), the first ceramic piece (71) and the second ceramic piece (72) are respectively clamped on the periphery of the lead column (8) in a matched mode, grooves (75) for placing magnetic steel (6) are respectively arranged in the first ceramic piece (71) and the second ceramic piece (72), the magnetic steel (6) is placed in the openings of the grooves (75), and the side walls of the magnetic steel (6) are spaced between the grooves (75);

including iron cup (2), ceramic part (7) outside is equipped with plastic mount (9), and plastic mount (9) include lateral wall, bottom and open end, plastic mount (9) opening to under ceramic part (7) direction is detained for plastic mount (9) both sides wall is located between ceramic part (7) and iron cup (2), iron cup (2) inboard is located to plastic mount (9) lateral wall, plastic mount (9) bottom is equipped with the through-hole that is used for lead pillar (8) to run through, plastic mount (9) one end is contradicted with magnetic conduction board (5).

2. The direct current contactor according to claim 1, wherein the arc extinguishing chamber comprises a first arc extinguishing chamber (711) formed by the concave of the first ceramic member (71) and a second arc extinguishing chamber (721) formed by the concave of the second ceramic member (72), the openings of the second arc extinguishing chamber (721) and the first arc extinguishing chamber (711) are opposite, and two ends of the movable contact plate (41) are respectively positioned in the second arc extinguishing chamber (721) and the first arc extinguishing chamber (711).

3. The direct current contactor according to claim 1, comprising a magnetically conductive plate (5) provided with a positioning mating portion (51), wherein the ceramic member (7) is provided with a positioning portion (74) on the side of the magnetically conductive plate (5), and wherein the positioning portion (74) cooperates with the positioning mating portion (51) to define the mounting position of the ceramic member (7).

4. A direct current contactor according to claim 3, wherein the positioning portion (74) is a protrusion or a groove/through hole, and the corresponding positioning mating portion (51) is a groove/through hole or a protrusion.

5. The direct current contactor according to claim 1, wherein the magnetic steel (6) is located on the same side of the stationary contact (81) and the movable contact plate (41) and is close to the two ends of the movable contact plate (41), and the two magnetic steels (6) are arranged in an opposite manner.

6. The direct current contactor according to claim 5, wherein the magnetic steel (6) is ring-shaped, the center of the ring being located on the opposite side of the magnetic steel (6).

7. The direct current contactor according to claim 1, wherein the iron cup (2) is installed in an installation cup (11) arranged on the support (1), a coil and an iron core (3) are further arranged in the iron cup (2), an insulation cover (10) is arranged at the opening end of the installation cup (11) in a matched mode, and a sealing layer is arranged between the insulation cover (10) and a port of the iron cup (2).