CN2315648Y

CN2315648Y - DC contactor

Info

Publication number: CN2315648Y
Application number: CN 97244792
Authority: CN
Inventors: 李玉敏
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-07
Filing date: 1997-11-07
Publication date: 1999-04-21
Anticipated expiration: 2007-11-07

Abstract

The utility model relates to a direct current contactor which is suitable for the direct current circuit, comprising a base, a clamping type electromagnetic system and bridge type main contacts. The utility model is characterized in that the both ends of the eight pairs of bridge type main contacts are provided with permanent magnetism blocks which are used for extinguishing arc. As the utility model adopts the permanent magnetism blocks to extinguish arc, the constant magnetic field can effectively solve the accident that the contacts are frequently burnt. The utility model also has the advantages of reliable performance, light weight, small volume, space saving, low cost, convenient maintenance, wide application range, long service life, etc.

Description

D.C. contactor

The utility model belongs to the low tension switch technical field, specifically a kind of D.C. contactor.

At present, the operation that a large amount of 500W of employing left and right sides direct current machine is finished branch, closed a floodgate in the operating structure of the employed key equipment SF6 of China's power transmission and transformation industry circuit breaker (GIS), and the control of the forward and backward of DC motor need be finished with the D.C. contactor of eight pairs of contacts, from the present CZ0 that produces is that routine direct current exposure parameter has two aspects not competent: the one, and the number of main contact is low, has only two pairs; The 2nd, current class is too high, and minimum has only 40 amperes.In actual use, because the appropriate products that does not match, some enterprises adopt common AC relay to substitute in order to reduce cost, and the contact of this relay owing to there is not direct current arc blow-out device the accident that contact burns often takes place.Therefore, a kind of small-sized (10A) D.C. contactor with eight pairs of contacts is badly in need of in the manufacturer of GIS.

The purpose of this utility model provides a kind of permanent magnetism arc extinguishing type D.C. contactor.

The purpose of this utility model is achieved in that it comprises base, clapper-type electromagnetic system, bridge-type main contact, is characterized in that being provided with the permanent magnets that is used for arc extinguishing at the two ends of eight pairs of bridge-type main contacts.

The arranged outside that the utility model also is included in permanent magnets has the insulation fixed head of spacing permanent magnets.

The utility model is owing to adopt the permanent magnetism arc extinguishing, and then constant magnetic field can solve the accident that frequent generation contact burns effectively.In addition owing to the permanent magnetism arc extinguishing is arranged on the two ends of bridge-type main contact, add between bridge-type double break point flash barrier is arranged, the two poles of the earth main contact has not had the both positive and negative polarity restriction like this, thereby eliminated the disjunction fault that the user produces because of the wiring error, and it is oversize can not the arcing time to occur when having the little electric current of disjunction, does not have the over worn advantage of contact during the big electric current of disjunction.The utility model has also that performance is safe and reliable, in light weight, volume is little, conserve space, characteristics such as cost is low, easy to maintenance, range of application is wide, long service life.

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

Fig. 1 is that structural representation cuts open in office of the present utility model

Fig. 2 is that end view cuts open in the office of Fig. 1

Shown in Fig. 1,2,4 is the clapper-type electromagnetic system of base, 6 for being made up of magnet, coil among the figure, be provided with contact supporting 3 on the top of base 4, on contact supporting 3, be equipped with and two groups of totally eight pairs of bridge-type main contacts 5 of example, be respectively arranged with a permanent magnets 1 that is used for arc extinguishing at the two ends of bridge-type main contact 5.The insulation fixed head that spacing permanent magnets can be arranged in the arranged outside of permanent magnets 1 as required.Nominal parameter of the present utility model is: direct current 220V, 10 amperes, breaking capacity is: 242V, 20 amperes, 15 milliseconds of time constants.Its using method is identical with the D.C. contactor of existing permanent magnetism arc extinguishing type.

Claims

1, a kind of D.C. contactor that is applicable in the DC circuit; It comprises base, clapper-type electromagnetic system, bridge-type main contact, it is characterized in that being provided with the permanent magnets that is used for arc extinguishing at the two ends of eight pairs of bridge-type main contacts.

2, D.C. contactor according to claim 1 is characterized in that arranged outside in permanent magnets has the insulation fixed head of spacing permanent magnets.