CN2549578Y

CN2549578Y - Durable knife switches

Info

Publication number: CN2549578Y
Application number: CN 02230603
Authority: CN
Inventors: 刘国辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-02
Filing date: 2002-04-02
Publication date: 2003-05-07
Anticipated expiration: 2012-04-02

Abstract

The utility model relates to a durable knife switch, belonging to the technical field of electric switch element. Aiming to solve the technical problem of ensuring the fused mass fastener not to be burned easily, the utility model mainly comprises a moving contact, a static contact, a moving contact fixing seat, a wire inlet seat, a wire outlet seat and a fused mass. The utility model is characterized in that the fixing position of the fused mass is provided with an upper metal gasket and a lower metal gasket; and the two ends of the fused mass are respectively fixed between the two gaskets. With the utility model, as the upper gasket and the lower gasket have good conduction and thermal transmission effect, the local high heat can be transmitted quickly, thereby effectively preventing the fused mass fastener from burning due to overload heating. Besides, even having a break arc, the gasket is firstly damaged without burning the switch main body, thereby greatly increasing the service time of the knife switch. Besides, the structural shape of the upper gasket and the lower gasket is beneficial for positioning the gasket, thereby being convenient for mounting and changing the fused mass. As the contacting area between the fused mass and the gasket is relatively large, the fixation of the fused mass is firmer.

Description

A kind of durable knife switch

Technical field

The utility model relates to a kind of improved knife switch, belongs to the electric switch technical field.

Background technology

Low tension switch is generally non-automatic switching electrical equipment, is widely used in various controller switching equipments and the supply line, as frequently not connecting and the usefulness of disjunction low-voltage supply line and insulating power supply.In the low tension switch of all polymorphic types, open-type load switch is most widely used.Open-type load switch is called for short knife switch, is to be combined by knife switch and fuse, and HK series of products commonly used are simple in structure, and low price widely adopts in general lighting circuit and small-power power consumption equipment control circuit.This situation in use appears in knife switch sometimes: because the trip bolt of melt stiff end is loosening, make the melt virtual connection emit high-temperature electric arc, cause pressing close to the trip bolt of melt and screw hole deformed damaged at high temperature, so that knife switch is scrapped.In addition, the circuit that some long-term excess load is used also can cause overheated and causes above-mentioned consequence because of trip bolt place contact resistance is excessive.

Summary of the invention

Technical problem to be solved in the utility model provides and a kind ofly can make the not durable knife switch of easy burn-out of melt securing member.

The alleged technical problem of the utility model is solved by following technical scheme:

A kind of durable knife switch comprises moving contact, fixed contact, moving contact holder, inlet wire seat, outlet seat and melt, and its special feature is: in the bearing of described melt, be provided with metal Upper gasket and lower gasket, melt is fixed between two pads.

Above-mentioned durable knife switch, one end of described lower gasket is provided with a location notch that has gap, one end of described Upper gasket be provided with one with gasket surface be 90 the degree washers, the gap of the corresponding lower gasket of the washer of Upper gasket, last lower gasket is being respectively equipped with screw hole with the corresponding position of trip bolt.

Above-mentioned durable knife switch, the described lower gasket of going up adopts heat conduction, electric conductivity good metal thin slice to make spacer thickness 0.5-1.5 millimeter.

After adopting the utility model, because last lower gasket favorable conductive and heat transfer effect, local high heat can be transmitted rapidly and be come, effectively prevent the phenomenon that the melt secure component burnt out because of overload heating, and, even open circuit electric arc, also at first make pad damage, and can not feed through to Switch main body, this has just improved the useful life of knife switch greatly.In addition, the planform of last lower gasket helps the location of pad, has made things convenient for the installation and the replacing of melt, and the contact area of melt and pad is bigger, makes the fixing more reliable of melt.

Description of drawings

Fig. 1 is a structural representation of the present utility model,

Fig. 2 is the lower gasket structure chart,

Fig. 3 is the Upper gasket structure chart:

As seen from Figure 1, at the melt stiff end 6 of outlet seat 5, be provided with Upper gasket 1 and lower gasket 2, melt 3 is sandwiched between the lower gasket, and is fixing by trip bolt 4.Referring to Fig. 2 as seen, lower gasket is that the sheet metal by a concave shape processes, on one side its recess is bent into the location notch 10 that has gap 11.The upper surface of lower gasket is provided with and the corresponding through hole 7 in trip bolt 4 positions.Referring to Fig. 3 as seen, Upper gasket is to be processed by a convex shape sheet metal, on one side its protuberance bends the washer 9 of 90 degree, and the also corresponding trip bolt through hole 8 that is provided with on Upper gasket, the diameter in shim screw hole is a bit larger tham the trip bolt diameter up and down.The location notch of lower gasket is entrenched in outlet seat melt stiff end during installation, makes pad screwing hole site consistent with melt stiff end screw hole location.When installing pad its washer is embedded the gap of lower gasket, can position Upper gasket like this.Melt 3 places between the lower gasket, and the contact-making surface of last lower gasket and melt is rectangular, and its size should be mated with outlet seat melt fastening end.Described spacer thickness 0.5-1.5 millimeter up and down should be selected conduction, heat conductivility good metal thin slice such as copper sheet, aluminium flake, nickel plating sheet metal etc. for use.

The other end of described melt also is fixed on the melt stiff end of moving contact holder in identical mode.

Knife switch is after the melt secure component has been installed lower gasket, and melt mainly is to contact with pad, and contact area is bigger, and is fastening reliable relatively.In case high temperature, high heat take place, its heat passes through pad earlier again to the secure component conduction, and the heating temperature of secure component is reduced greatly, has therefore prolonged the useful life of parts, thereby has also just prolonged the life-span of whole knife switch.

Claims

1. durable knife switch, comprise moving contact, fixed contact, moving contact holder, inlet wire seat, outlet seat and melt, it is characterized in that: the bearing in described melt (3), be provided with metal Upper gasket (1) and lower gasket (2), melt is fixed between two pads.

2. durable knife switch according to claim 1, it is characterized in that: an end of described lower gasket is provided with a location notch (10) that has gap (11), one end of described Upper gasket be provided with one with gasket surface be 90 the degree washers (9), the gap of the corresponding lower gasket of the washer of Upper gasket, last lower gasket is being respectively equipped with screw hole (7), (8) with the corresponding position of trip bolt (4).

3. durable knife switch according to claim 2 is characterized in that: the described lower gasket of going up adopts heat conduction, electric conductivity good metal thin slice to make spacer thickness 0.5-1.5 millimeter.