CN2134704Y

CN2134704Y - Low voltage manually-operated electrical appliance contact means for axially quenching

Info

Publication number: CN2134704Y
Application number: CN 92215874
Authority: CN
Inventors: 朱用名
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-07-16
Filing date: 1992-07-16
Publication date: 1993-05-26
Anticipated expiration: 2002-07-16

Abstract

The utility model relates to a contact device for electrical appliance switches, which belongs to the electrical appliance field. An electric switch usually achieves the purposes of switching a circuit by the contact and the separation between movable contacts and static contacts. When the high voltage DC circuit works, at the switching moment of the circuit, contacts can cause electric arc to burn interior plastic parts; if the electric arc is guided to outside, the three-phase electric arc is easy to be made to direct short outside. The utility model processes a nick on the traditional contact conducting strip, simultaneously a sheet metal is inserted in the proper position of an electrical appliance housing, and the electric arc is guided to outside and is cooled down and extinguished arc; consequently the safety of switches is enhanced, and the service life of products is prolonged.

Description

Low voltage manually-operated electrical appliance contact means for axially quenching

The utility model relates to the improvement of the manual electrical contact device of a kind of low pressure, belongs to appliance field.

The low-voltage electrical apparatus switch is the universal product that has a large capacity and a wide range, and relates to every field and industry, because user's operand is many and the operation sequence complexity, so the user not only requires the appliance switch overall dimensions little, the breaking capacity height also requires good reliability, and the life-span is long.Existing appliance switch mainly is made up of one group of fixed contact, frame movable contact bridge and the cam that has square shaft etc. on fixed contact, by the rotation square shaft, drive cam and fixed contact and movable contact bridge are presented is connected and two states of disconnection, wherein fixed contact is the rectangle conducting strip.The device for switching of this structure is when a certain amount of inductive load, and electric current is influenced by electric power, and electric arc always moves to electrical equipment is inner, and the inner plastic part of burning makes it cracking or distortion, causes the appliance switch can't operate as normal, and the life-span is short.For fear of the electric parts of burning, often electric arc is caused the external world, but this mode can cause three-phase electric arc to be met on the boundary outside, causes phase fault.

The purpose of this utility model is to change slightly on original contact apparatus, change the outer folk prescription of electric arc to, improve plastic member simultaneously, reduce electric arc heat energy, shorten the quenching time.

In order to achieve the above object, the appropriate location that has apsacline rectangle conducting strip at fixed contact, process a breach, make the unequal distribution of electric current, intensive in conducting strip on one side, the electric arc of formation is turned round is turn 90 degrees outer plastic member inwall partially, simultaneously, at corresponding arc position setting-in a slice soft magnetic material of plastic member inwall such as steel disc.When the movable contact bridge has just disconnected, electric arc is in the link position of two contacts, because electric current is bigger, the magnetizing force in magnetic field is also bigger, near steel disc, form magnetic field, omit the steel disc internal resistance, the magnetic resistance of whole magnetic loop mainly is exactly the magnetic resistance of air-gap, the magnetic line of force tries hard to shorten its length of magnetic path, and therefore the distance of opening along with dynamic/static contact increases, and electric arc is subjected to the electric power influence of asymmetric formula fixed contact on the one hand, add the attraction of steel disc to the magnetic line of force, urge electric arc is moved very fast by axis direction, cooled off fast, reach the effect of deionization arc extinguishing by steel disc, because the quenching time is shorter, electric arc can not rebound to other part, has improved the security reliability of product, its disjunction with connect number of times and bring up to 50 times by original 20 times.Change the outer folk prescription of electric arc to also can be, simultaneously the soft magnetic material position of setting-in on the corresponding change plastic member at moving contact appropriate location gap.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of the present utility model.

Fig. 2 is that electric arc changes schematic diagram between contact.

Referring to Fig. 1, square shaft 8 links to each other with the cam 7 that has breach, cam 7 contacts with the semicircular base of slide block 10, moving contact 3 is packed in the square slotted eye of slide block 10 and is compressed by spring 9, the termination lower surface of moving contact 3 has contact 12 corresponding with the contact 11 of asymmetric fixed contact 6, is embedded with perpendicular to fixed contact 6 and moving contact 3 planes in the enclosure on the wall 1 and is parallel to the steel disc 2 of contact 11, contact 12 lines.When current lead-through, fixed contact 6 is connected with moving contact 3, in the time will disconnecting, square shaft 8 drives cam 7 and rotates, on slide block 10 tops, moving contact 3 begins to leave fixed contact 6, and referring to Fig. 2, at this moment electric arc is in the I position, because electric current is bigger, the magnetizing force in magnetic field is also bigger, and magnetic resistance in the steel disc is omitted near formation magnetic field steel disc 2, the magnetic resistance of whole magnetic loop mainly is the magnetic resistance of air-gap, the magnetic line of force tries hard to shorten the length of its magnetic circuit, and therefore the distance along with dynamic/static contact increases, and electric arc is subjected to the electric power influence of asymmetric fixed contact 6 on the one hand, add the attraction on 2 pairs of magnetic lines of force of steel disc, impel electric arc to move to the II position at a gallop, cooled off fast, reach the arc extinguishing effect by steel disc 2 by axis direction.

Claims

1, a kind of contact apparatus of appliance switch, comprise moving contact 3, fixed contact 6, contact 11, contact 12, slide block 10 and cam 7, it is characterized in that being positioned at the fixed contact 6 below the moving contact 3,, near fixed contact 6 and moving contact 3, soft magnetic material 2 is housed Yi Bian its rectangle conducting strip inwardly is processed with breach.

2,, it is characterized in that soft magnetic material 2 is flush-mounted in outer casing inner wall 1, and be parallel to the line of contact 11 and contact 12, perpendicular to fixed contact 6 and moving contact 3 planes according to the said contact apparatus of claim 1.