CN219017537U

CN219017537U - DC contactor

Info

Publication number: CN219017537U
Application number: CN202223015048.9U
Authority: CN
Inventors: 何伟; 何建文; 李伟全; 白庆生; 姬华; 巩烨霖
Original assignee: Tianshui 213 Electrical Appliance Group Co ltd
Current assignee: Tianshui 213 Electrical Appliance Group Co ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-05-12
Anticipated expiration: 2032-11-14

Abstract

The utility model discloses a direct current contactor, which comprises a base and a shell at the upper part of the base, wherein a magnetic yoke is arranged in a cavity in the base, an armature is arranged above the magnetic yoke, and a coil is arranged between the magnetic yoke and the armature; the middle part of the shell is provided with a contact support, the lower side of the contact support is provided with a contact support window, and a moving contact vertically moving along the window is arranged in the contact support window; a group of fixed seat windows and adjacent groups of contact windows are symmetrically distributed along the two sides of the contact support, fixed seats are arranged in the fixed seat windows, and permanent magnets are arranged in the fixed seats; the contact window is internally provided with a fixed contact, and a group of fixed contacts and moving contacts which are symmetrically arranged are contacted through contacts; according to the utility model, the permanent magnet is placed at a specific position in the alternating current contactor shell, so that higher direct current breaking capacity is realized under the condition of smaller product volume, and the same direct current breaking capacity as that of an alternating current contactor with the same volume can be realized.

Description

DC contactor

Technical Field

The utility model relates to the technical field of electricity, in particular to a direct current contactor.

Background

In some switch devices, there is a high-power dc electromagnet load, where the air gap of the magnet is large when the switch device is closed, so that a large exciting current is needed, and once the magnet is closed, the needed exciting current is reduced, so that the power consumption of the magnet and the coil is reduced, and a current-limiting resistor needs to be connected in series to the circuit through the switch device. The arc generated by the switching device is difficult to extinguish in the process of switching the current limiting resistor.

In the prior art, a relay or an alternating current contactor is generally adopted as a switching device, and arc extinction is realized through series connection of a plurality of groups of contacts, but because an arc extinction system is designed according to an alternating current circuit, the defects of easiness in burning of the contacts, short service life of products and the like exist in the direct current circuit when the arc extinction system is practically applied to the direct current circuit, and particularly, the performance requirement cannot be met in the use situation of more than DC 220V. If the direct current contactor is adopted, the volume and the performance cannot be simultaneously met, the product with the met performance is large in volume and cannot be installed inside a switching device, and rated working voltage and rated working current of the product with the smaller volume cannot meet the requirements, so that the direct current contactor with the small volume, the rated working voltage and the rated working current meet the requirements, and the direct current contactor is not easy to burn and has long service life.

Disclosure of Invention

The utility model aims to solve the technical problems in the background art and provide the direct current contactor which is small in size, low in burning loss and long in service life, and rated working voltage and rated working current meet requirements.

In order to solve the technical problems, the utility model provides the following technical scheme:

the direct current contactor comprises a base and a shell at the upper part of the base, wherein a magnetic yoke is arranged in a cavity in the base, an armature is arranged above the magnetic yoke, and a coil is arranged between the magnetic yoke and the armature; the middle part of the shell is provided with a contact support, the lower side of the contact support is provided with a contact support window, and a moving contact vertically moving along the window is arranged in the contact support window; a group of fixed seat windows and adjacent groups of contact windows are symmetrically distributed along the two sides of the contact support, fixed seats are arranged in the fixed seat windows, and permanent magnets are arranged in the fixed seats; the contact window is internally provided with a fixed contact, and a group of fixed contacts and moving contacts which are symmetrically arranged are contacted through contacts.

Preferably, the inside of fixing base is square cavity structure, has seted up first oblique chamfer on a right-angle limit of this cavity structure, and the side of fixing base is equipped with fixing base couple, is equipped with the direction sign on the end cover.

Preferably, a second oblique chamfer is formed on one right-angle side of the permanent magnet, and the second oblique chamfer is matched with the first oblique chamfer.

Preferably, a hook clamping groove is formed in the fixing seat window, and a fixing seat hook is clamped on the hook clamping groove.

The beneficial effects of the utility model are as follows:

(1) According to the utility model, the permanent magnet is arranged at a specific position in the alternating current contactor shell, the magnetic field generated by the permanent magnet enables the electric arc to move to the outer side of the shell under the action of electromagnetic force and cool and extinguish, and high direct current breaking capacity is realized under the condition of smaller product volume, and particularly, the direct current breaking capacity identical to that of an alternating current contactor with the same volume can be realized under the use condition that rated working voltage is larger than DC 220V.

(2) According to the utility model, the permanent magnets are positioned through the inclined chamfer angles on the permanent magnets, so that the magnetic force lines of each permanent magnet pass through two groups of contacts simultaneously, the number of the permanent magnets required by a product is reduced, and the other parts are universal to the alternating current contactor.

(3) The utility model ensures that the magnetic poles of the permanent magnet and the contact point are in the same horizontal plane by designing the installation position of the permanent magnet and adjusting the direction of magnetic force lines, ensures that the magnetic induction intensity of the space position of the contact point is maximum, accelerates the arc transfer, reduces the electric wear of the contact point, and has the advantages of difficult burning loss and long service life of products.

Drawings

FIG. 1 is a schematic view of the appearance of the present utility model;

FIG. 2 is a schematic view of a contact portion of the present utility model;

FIG. 3 is a schematic view of a portion of a permanent magnet according to the present utility model;

FIG. 4 is an isometric schematic view of FIG. 3;

FIG. 5 is a schematic illustration of the location of the contacts and fixtures within the housing;

FIG. 6 is a schematic view of a fixing base structure;

FIG. 7 is a schematic view of a direction indicator in the holder of FIG. 6;

fig. 8 is a schematic view of the permanent magnet structure of fig. 1;

FIG. 9 is a schematic diagram of the relationship between the magnetic field generated by the permanent magnet in the horizontal direction and the contact;

FIG. 10 is a schematic illustration of the magnetic field generated by a permanent magnet acting on an arc;

in the figure: 1. the direct current contactor comprises a direct current contactor body 2, a shell body 201, a fixed seat window 202, a contact window 3, a base, a fixed contact 4, a movable contact 5, a contact 6, a contact 7, a permanent magnet 8, a fixed seat 9, a fixed seat hook 10, a first inclined chamfer angle 11, a second inclined chamfer angle 12, a direction mark 13, a contact support 14, an armature, 15, a magnetic yoke, 16, a coil 17 and a hook clamping groove.

Detailed Description

The utility model is described in further detail below with reference to the accompanying drawings.

The direct current contactor as shown in fig. 1-10 comprises a base 3 and a shell 2 at the upper part of the base 3, wherein a magnetic yoke 15 is arranged in a cavity in the base 3, an armature 14 is arranged above the magnetic yoke 15, and a coil 16 is arranged between the magnetic yoke 15 and the armature 14; the middle part of the shell 2 is provided with a contact support 13, the lower side of the contact support 13 is provided with a contact support window, and a moving contact 5 vertically moving along the window is arranged in the contact support window; after the coil 16 is electrified, an electromagnetic field is generated, the armature 14 is driven by electromagnetic attraction to drive the contact support 13 to move downwards, and the moving contact 5 in the window of the contact support 16 moves together until the armature 14 and the contact support 13 stop moving after the armature 14 contacts the magnetic yoke 15.

A group of fixed

seat windows

201 and 3 adjacent groups of contact windows 202 are symmetrically distributed along the two sides of the contact support 13, a fixed seat 8 is arranged in the fixed seat windows 201, and a permanent magnet 7 is arranged in the fixed seat 8; the contact window 202 is internally provided with a fixed contact 4, and a group of symmetrically arranged fixed contacts 4 and moving contacts 5 are contacted through contacts 6.

The inside of the fixed seat 8 is a square cavity structure, a first inclined chamfer 10 is formed on one right-angle side of the cavity structure, a fixed seat hook 9 is arranged on the side surface of the fixed seat 8, a direction mark 12 is arranged on the end cover, and the direction mark 12 is used for indicating the position of the fixed seat 8 assembled in the fixed seat window 201; a second inclined chamfer 11 is formed on one right-angle side of the permanent magnet 7, the second inclined chamfer 11 is matched with the first inclined chamfer 10, and the first inclined chamfer 10 and the second inclined chamfer 11 are used for positioning magnetic poles of the permanent magnet 7 so as to avoid polarity errors of the permanent magnet 7; the fixing seat window 201 is provided with a hook clamping groove 17, and the fixing seat hook 9 is clamped on the hook clamping groove 17.

As shown in fig. 9 and 10, after assembly, the permanent magnet 7 generates two magnetic lines of force symmetrical along the center line of the product, part of the magnetic lines of force passes through the space where the contact 6 is located, when the contact 6 is opened, an arc is generated, the arc is subjected to the action of ampere force F in a magnetic field and moves to the outer sides of the fixed contact 4 and the moving contact 5, and at the moment, the arc is extinguished, and the circuit is opened.

According to the utility model, the permanent magnet is arranged at a specific position in the alternating current contactor shell, the magnetic field generated by the permanent magnet enables the electric arc to move to the outer side of the shell under the action of electromagnetic force and be cooled and extinguished, so that higher direct current breaking capacity is realized under the condition of smaller product volume, and particularly, the same direct current breaking capacity as that of an alternating current contactor with the same volume can be realized under the use condition that rated working voltage is larger than DC 220V; the permanent magnets are positioned through the inclined chamfer angles on the permanent magnets, so that magnetic lines of force of each permanent magnet penetrate through two groups of contacts simultaneously, the number of the permanent magnets required by a product is reduced, and other parts are universal with an alternating current contactor.

The foregoing is merely a preferred example of the present utility model, and it should be noted that other equivalent variations and modifications can be made as well known in the mechanical arts by those skilled in the art, given the technical teaching provided herein, and should also be considered as the scope of the present utility model.

Claims

1. A direct current contactor, characterized in that: the device comprises a base (3) and a shell (2) at the upper part of the base (3), wherein a magnetic yoke (15) is arranged in an inner cavity of the base (3), an armature (14) is arranged above the magnetic yoke (15), and a coil (16) is arranged between the magnetic yoke (15) and the armature (14); a contact support (13) is arranged in the middle of the shell (2), a contact support window is arranged at the lower side of the contact support (13), and a moving contact (5) vertically moving along the window is arranged in the contact support window; a group of fixed seat windows (201) and adjacent groups of contact windows (202) are symmetrically distributed along the two sides of the contact support (13), a fixed seat (8) is arranged in the fixed seat windows (201), and a permanent magnet (7) is arranged in the fixed seat (8); the contact window (202) is internally provided with a fixed contact (4), and a group of symmetrically arranged fixed contacts (4) and moving contacts (5) are contacted through contacts (6).

2. A dc contactor according to claim 1, wherein: the inside of fixing base (8) is square cavity structure, has seted up first oblique chamfer (10) on a right-angle limit of this cavity structure, and the side of fixing base (8) is equipped with fixing base couple (9), is equipped with direction sign (12) on the end cover.

3. A dc contactor according to claim 1 or 2, characterized in that: a second inclined chamfer (11) is formed on one right-angle side of the permanent magnet (7), and the second inclined chamfer (11) is matched with the first inclined chamfer (10).

4. A dc contactor according to claim 3, wherein: a hook clamping groove (17) is formed in the fixing seat window (201), and a fixing seat hook (9) is clamped on the hook clamping groove (17).