JPS5887713A - Combination electric contacts - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Zero-shot @ relates to the modification of combination electrical contacts.

In recent years, with the development of electrical and electronic technology, various electrical and electronic devices have become smaller, and breakers have changed accordingly! Dunnett's switch lllI4 has been intensified.

However, when breakers, magnetic switches, etc. are made smaller, the creepage distance and insulation distance of the equipment becomes less than 9K, and the problem arises that the withstand voltage in the insulation resistance decreases due to wear and tear of the skin. arise.

There is also the problem that the contact force and separation force of the electrical contacts are reduced, making it easier for bath deposition to occur.

For this reason, there is a demand for a combination electrical contact that has good wear resistance and excellent welding resistance, and various combination electrical contacts have been developed, but so far none have been satisfactory.

Conventionally, 11 points of electric combinations are made of 11 points made of scissors-metal oxide with metal oxide dispersed in the chain, among which 11 points of contacts made of scissors-metal oxide with oxidizing power of Yi, iumum, tin oxide, and indium oxide are used, all facing each other. Combined electrical contacts have been widely used because of their excellent bath adhesion resistance. However, it consumes a lot of wear and tear, resulting in insulation deterioration, so it has not been applied particularly to small relays. On the other hand, the nickel-tungsten carbide point wears uniformly and has little wear resistance, but -
It was not possible to apply it to small electric appliances where the separating force could not be large because of the variation in welding resistance peculiar to the nickel type.

In this way, the conventional combination ◆ 1 QII, aFi, opposing fixed contacts and movable ml, l# [ were made of electrical # point materials with the same properties, so the welding resistance was good, but the wear resistance was poor. On the other hand, there were problems such as good abrasion resistance but poor welding resistance. Therefore, the present inventor has made efforts to develop a combination electrical contact that has good wear resistance, does not deteriorate insulation resistance, and has excellent bath adhesion resistance for miniaturized breakers, FF magnet switches, etc. The beginning of the investigation, fixed contacts facing each other and movable points! It has been found that welding resistance and abrasion resistance can be improved by using mA materials with different abrasion resistances at one point of the il.

The present invention has been made with attention to this point.) As a combination electric writing point that can reliably improve welding resistance and abrasion resistance, it is possible to use silver-cadonium oxide, tin oxide-indium oxide system! It is an object of the present invention to provide a combination electric writing point in which a # point and a contact point of the nickel-tungsten carbide (tungsten) system are opposed to each other.

Combination electric 114Fi by Favorite @ I4, cadmium 2~~8″W7 and tin 4 pieces on opposing contacts
11'' / silver-snow cadmium tin oxide-indium oxide system IIP, I# containing 11" / and indium #7, and nickel 10-60", tungsten, tungsten carbide type 1 or #'i type 2 tube total at 0,5~1sW10.
The t* characteristic is that a silver-metallic-expanded tungsten (tungsten) system contact is used.

The reason for limiting the materials of the opposing contacts in the combined electrical contact of the present invention as described above is to take advantage of the excellent welding resistance of the silver-cadmium oxide-tin oxide-indium molybide system, and to utilize the excellent welding resistance of the silver-cadmium oxide-tin oxide-indium molybide system, and to utilize the excellent welding resistance of the complex-nickel system. By taking advantage of the good abrasion resistance of the tube, these synergistic effects can eliminate the poor welding resistance or abrasion resistance of conventional electrical contacts made of the same or similar materials facing each other. This is to eliminate the poor insulation resistance characteristics tS. In addition, the content of cadmium in the silver-cadmium oxide-tin oxide-indium oxide system is 2 W/
)-84 because if it is less than 2), the welding resistance is insufficient, and if it exceeds jIs%t-, consumption due to separation of cadmium oxide becomes extremely large. Content of tin t-4
If the indium content is less than 4%, the excellent heat resistance of tin oxide cannot be utilized, and if it exceeds 11%, processing becomes difficult.
” / If the composite oxide with cadmium and tin is within this range, it will be produced in just the right amount and have a good effect.If the component is within the above range, silver-cadmium oxide-oxide Even if a small amount of oxides such as zinc, lead, thallium, antimony, bis-is, manganese, iron group, etc. are added to indium tin monoxide, the properties are not impaired.

The content of nickel in the silver-nickel system is limited to 10 to 601, and if it is less than 10, the abrasion resistance is insufficient.
This is because if it exceeds 60-, the contact resistance becomes extremely unstable. The reason why one or two of tungsten and tungsten carbide is added in a total of 0.5 to 5 is because it improves the welding resistance.

Next, in order to fully clarify the effects of the combined electrical contact according to Honmei 94, specific embodiments and conventional examples thereof will be described.

[Example 1] Ag-Cd0 7 Wlo-8nOz4'N10
- Fixed contacts of 5 w Jf consisting of In 033W10 and nickel 25'N10. tungsten carbide 2.5
A 4 W / movable contact made of a complex tungsten carbide containing ``/'' was placed facing each other to form an electrical contact of 1 m in length.

[Example 2] A g Cd Os, 3'N10-8 n Om
& 5% I n 20mλO"/ 5ml fixed contact and nickel 15"N10. Tungsten carbide 1-, tungsten o, s'W10f
A 4 W/movable contact made of silver-nickel-nickel-charcoal-tungsten was made to face each other to form an electric contact AV.

[Conventional example 1] Ag-Cd0 7'W10-8n01 4'N1O
-InzOs 3- A combination of a 5 w j fixed contact and a 4 ml movable contact facing each other creates electricity! #Friends who form a fear.

[Conventional Example 2] Chain containing nickel 15W10 and tungsten carbide 5% - 5w/nickel-tungsten carbide chain
A fixed Il skin and a movable contact point of 4 m/m were placed opposite each other to form an electric mower point.

When the number of times of welding, insulation resistance, and amount of wear were measured for each of these combinations of contacts under test conditions of 10 sets of manure, the results shown in the table below were obtained.

Welding resistance test conditions oAcroOV　50Hz Oll Current: Input current 40A Voluntary current 10A O opening/closing frequency: goa/min OII contact crab 40g, separation crab 40g insulation resistance measurement o'I) csoov by Mega.

As is clear from the table above, silver - cadmium oxide - tin oxide -
The combined electrical contact of the present invention, in which an indium oxide-based contact and a tungsten tungsten (tungsten) 1# wire are opposed to each other, compensates for each other's deficiencies when used alone and in combination. Extending its strengths, namely welding resistance.

This is an electrical contact with an excellent combination of wear resistance and wear resistance.

If the combined one-point tube of the present invention is used, it will be miniaturized and can sufficiently cope with the severe usage conditions of magnetic breakers, magnetic switches, and relays.

Applicant: Tanaka Kikinzoku Kogyo Co., Ltd.

Claims (1)

[Claims] Cadium 2″10-8- and Tin 4″N, 7-11
” / and indium l C~7-containing silver-oxidizing power domium tin oxide-indium oxide system contact, and nickel 1
0~go''10. 11 points of electric combinations made of one or two types of tungsten and tungsten carbide with a total of 0.5~5 - bales made of Yu Nishizanbe and nickel-based contacts facing each other.