CN103247478B - Contact totally enclosed contactor - Google Patents

Abstract

The invention discloses a contact totally-enclosed contactor, which comprises a movable contact, a movable contact support, a movable contact spring, a fixed contact, an armature, a base, a buffer spring, a fixed iron core, an electromagnetic coil and a shell, wherein the shell seals the movable contact, the movable contact support, the movable contact spring, the armature and the buffer spring, one end of a contact of the fixed contact extends into the shell, and the other end of the contact extends out of the shell; a magnetic transition iron core is arranged between the shell and the base, the lower end of the magnetic transition iron core penetrates through the shell to be in contact with the static iron core, and the upper end of the magnetic transition iron core penetrates through the shell to be exposed below the armature. The movable contact, the movable contact support, the movable contact spring, the armature and the buffer spring are sealed in the shell, and the magnetic transition iron core is used as a magnetic field conduction mechanism, so that the interior of the contactor can be isolated from the outside, impurities such as dust and the like are prevented from entering, the sparks generated when the contacts are contacted can be ensured not to ignite flammable and explosive gases such as gas and the like, and potential safety hazards are eliminated.

Description

A contact fully enclosed contactor

technical field

The invention relates to the technical field of electrical equipment, in particular to a contactor which functions as a switch and is applied in the fields of electric power, power distribution and power consumption.

Background technique

A contactor refers to an electrical appliance that uses an electromagnetic coil to flow through an electric current to generate a magnetic field to close the contacts in industrial electricity to control the load. A traditional contactor usually consists of an electromagnetic system (armature, static iron core, electromagnetic coil), a contact system (moving contact and static contact) and an arc extinguishing device. Because it can quickly cut off the AC and DC main circuits and can frequently connect to the high-current control circuit, it is often used as a control object for motors, and can also be used to control factory equipment, electric heaters, working machines and various electric power Units and other electrical loads.

Due to the influence of the dynamic and static magnet structure of the traditional contactor, the contacts cannot be fully enclosed, so its technical defect is open, that is, the aforementioned electromagnetic system and contact system are not closed. The disadvantages of this structure are: first External impurities such as dust and dust are easy to enter and attach to the contacts. After a long period of use, a layer of dust will accumulate on the contacts, which may not only cause poor contact, but also increase the resistance between the contacts, resulting in a high If the rise exceeds the specified value, it will affect the normal work and even damage the contactor. If you want to clean the dust, you need to disassemble the contactor. The operation is quite troublesome; The arc extinguishing device cannot completely eliminate the risk of sparks igniting flammable and explosive gases such as gas, and there are certain safety hazards. Therefore, traditional contactors cannot be directly applied to places where flammable and explosive gases exist, and need to be installed with protective devices before they can be used. This will not only increase the additional cost of use, but also the protective effect is not ideal.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fully enclosed contactor with reasonable structure design, safety and reliability.

In order to solve the above technical problems, the present invention adopts the following technical solution: a fully enclosed contactor, characterized in that it includes a moving contact, a moving contact bracket, a moving contact spring, a static contact, an armature, a base, Buffer spring, static iron core and electromagnetic coil, the static iron core is installed on the base, the electromagnetic coil is installed on the static iron core, the armature is set above the static iron core, the buffer spring is fixed on the bottom of the armature, and the movable contact bracket is fixed on the armature. The moving contact is fixed on the moving contact bracket, and the static contacts are respectively fixed on the upper and lower sides of the moving contact, and the two moving contacts are connected by a moving contact spring; between the moving contact bracket and the armature, the static iron core There is a gasket between the bottom surface and the base; the contactor also includes a closed shell, which is fixed on the base, and the shell holds the movable contact, the movable contact bracket, the movable contact spring, the armature and the buffer The spring is sealed inside, one end of the static contact extends into the housing, and the other end protrudes out of the housing; a magnetic transition iron core is provided between the housing and the base, and the lower end of the magnetic transition iron core passes through the housing and the static The iron core is in contact, and the upper end protrudes below the armature through the shell. Both the static contact and the magnetic transition iron core can be combined with the housing by injection molding, and the joint is a sealed structure.

Further, the magnetic transition iron cores are several pieces corresponding to the upper structure of the static iron core, and each magnetic transition iron core is independent of each other and the lower ends are in contact with the convex part of the static iron core. The magnetic transition iron core can conduct the magnetic field generated by the electromagnetic coil to the inside of the housing and act on the armature.

The present invention seals the movable contact, the movable contact bracket, the movable contact spring, the armature and the buffer spring by adopting a fully enclosed shell, and adopts the magnetic transition iron core as the magnetic field transmission mechanism, which solves the problem of the contact The conduction of the magnetic field after sealing can isolate the inside of the contactor from the outside world, avoid dust and other impurities from entering, and ensure that it can work normally for a long time; because it isolates the flammable and explosive gases that may exist in the outside world, It can ensure that the sparks generated when the contacts are in contact will not ignite or detonate the gas. Therefore, the present invention can be directly applied in the environment where there are flammable and explosive gases without installing any additional protective devices, eliminating potential safety hazards, and more It is safe and reliable, and can also greatly reduce the cost of use.

Description of drawings

Fig. 1 is the plane structural diagram of the present invention.

In the figure, 1 is the housing, 2 is the moving contact bracket, 3 is the moving contact, 4 is the moving contact spring, 5 is the static contact, 6 is the liner, 7 is the armature, 8 is the base, and 9 is the buffer Spring, 10 is a magnetic transition iron core, 11 is a static iron core, and 12 is an electromagnetic coil.

Detailed ways

In this embodiment, referring to Fig. 1, the contact fully enclosed contactor includes a movable contact 3, a movable contact bracket 2, a movable contact spring 4, a static contact 5, an armature 7, a base 8, and a buffer spring 9. The static iron core 11 and the electromagnetic coil 12, the static iron core 11 is installed on the base 8, the electromagnetic coil 12 is installed on the static iron core 11, the armature 7 is arranged above the static iron core 11, and the buffer spring 9 is fixed on the bottom surface of the armature 7, The movable contact bracket 2 is fixed on the armature 7, the movable contact 3 is fixed on the movable contact bracket 2, and the static contacts 5 are respectively fixed on the upper and lower sides of the movable contact 3. The point spring 4 is connected; a gasket 6 is provided between the movable contact bracket 2 and the armature 7, and between the bottom surface of the static iron core 11 and the base 8; the contactor also includes a closed shell 1, and the shell 1 is fixed On the base 8, the housing 1 seals the movable contact 3, the movable contact bracket 2, the movable contact spring 4, the armature 7 and the buffer spring 9, and one end of the static contact 5 extends into the housing 1. The other end protrudes from the shell 1; a magnetic transition iron core 10 is provided between the shell 1 and the base 8, the lower end of the magnetic transition iron core 10 passes through the shell 1 and contacts the static iron core 11, and the upper end passes through the shell The body 1 protrudes below the armature 7 . Both the static contact 5 and the magnetic transition iron core 10 can be combined with the housing 1 by means of injection molding, etc., and the joint is a sealed structure.

The magnetic transition iron core 10 is a plurality of blocks corresponding to the upper structure of the static iron core 11 , each magnetic transition iron core 10 is independent of each other and the lower end is in contact with the raised portion of the static iron core 11 . The magnetic transition iron core 10 can conduct the magnetic field generated by the electromagnetic coil 12 to the inside of the housing 1 and act on the armature 7 .

After testing, after a long time of use, the contact conduction performance of the contacts is always good.

The present invention has been described in detail above. The foregoing description is only a preferred embodiment of the present invention, and should not limit the implementation scope of the present invention. within the scope of the invention.

Claims (2)

1. A contact fully enclosed contactor, characterized in that it includes a moving contact, a moving contact bracket, a moving contact spring, a static contact, an armature, a base, a buffer spring, a static iron core and an electromagnetic coil, and the static The iron core is installed on the base, the electromagnetic coil is installed on the static iron core, the armature is set above the static iron core, the buffer spring is fixed on the bottom of the armature, the moving contact bracket is fixed on the armature, and the moving contact is fixed on the moving contact bracket. The static contacts are respectively fixed on the upper and lower sides of the movable contacts, and the two movable contacts are connected by a movable contact spring; there are gaskets between the movable contact bracket and the armature, and between the bottom surface of the static iron core and the base; The contactor also includes a closed casing, which is fixed on the base, and the casing seals the movable contact, the movable contact bracket, the movable contact spring, the armature and the buffer spring, and the contact of the static contact One end protrudes into the casing, and the other end protrudes outside the casing; a magnetic transition iron core is provided between the casing and the base, the lower end of the magnetic transition iron core passes through the casing and contacts the static iron core, and the upper end protrudes through the casing Below the armature, the magnetic transition iron core conducts the magnetic field generated by the electromagnetic coil into the housing to act on the armature; the joint between the static contact and the magnetic transition iron core and the housing is a sealed structure. 2. The fully enclosed contactor according to claim 1, characterized in that: the magnetic transition iron cores are several pieces corresponding to the upper structure of the static iron core, each magnetic transition iron core is independent of each other and the lower ends are In contact with the raised portion of the static core.