JPS6041408B2 - Enclosed contact relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly reliable and long-life encapsulated relay.

Conventionally, a two-component mixed gas, such as a mixed gas of N2 and Q or a mixed gas of N2 and 02, has been used as the filler gas in a sealed electric rope device.

Among these, an enclosed type relay using a mixture of two gases, N2 and N2, keeps the contact surface relatively clean, so an increase in contact resistance can be avoided, but it has the disadvantage that it tends to stick. The following table shows AgPd40/6X%, A
This is an example of the probability of occurrence of adhesion failure obtained from operation tests of Cape D60/4 skin t% and Pd contacts. Adhesion occurred in more than a few percent of contacts, and the depth of the adhesion reached 10 rm or more. . In the conventional atmosphere in which H2 is added to this, cleaning of the surface is further promoted, so that adhesion problems tend to further increase. Table Adhesion occurrence rate in opening/closing operation in pure N2 atmosphere Note 1 Adhesion occurrence probability = Number of contacts where adhesion occurs/Number of test contacts Note 2
Number of contacts to be tested: 16 each Note 3 Opening/closing conditions: Mechanical opening/closing 2 x 1 times, N2 and 0 on one side
In contact-encapsulated relays using a two-gas mixture as described in 2, a coating layer containing oxygen is formed during operation, making it possible to prevent adhesion.However, materials with poor corrosion resistance have the disadvantage of increasing contact resistance.

Figure 1 is a diagram showing an example of contact resistance characteristics when the contact is operated in an N2002 (20%) mixed gas atmosphere.
gPd40/6 skin t%, A cape d60/40Wt% and P
d is indicated by Z, Ku, and Kei in the figure, respectively.

(Figures 2 and 3 are shown in the same manner.) In both cases, there is no adhesion, but the contact resistance increases with operation, and even at the warm point of homogeneous metals near AgPd40/6, metals with slightly inferior corrosion resistance In this case, the contact resistance increases. If a mixed gas of N2 and Ni2 or 02 is sealed in this way, unless measures are taken such as limiting the materials, it will stick.
However, this method has the disadvantage that one of the problems such as an increase in contact resistance is likely to occur.

In order to eliminate these drawbacks, the present invention uses a three-component mixed gas as a filler gas consisting of an inert gas such as N2, an oxidizing gas such as 02, and a reducing gas such as 02, and The following will be described in detail based on examples.

Figure 2 is an example of the present invention, N2002 (20%).
FIG. 3 is a diagram showing contact resistance characteristics of a contact operated in a three-component mixed gas atmosphere consisting of 10% (1%).

Here, the main points of A#d40/6, 40 contacts of AuPd60, and Pd contacts were tested. The contact resistance for all three types of contacts is 4.
It is extremely stable over 1 times, and no adhesion problems occur.

The contact depth was at most 3R skin depth, so it can be said that there is no risk of developing adhesion problems. In addition, as a result of analyzing the contact surface with an Auger electron spectrometer, the thickness of the coating layer where the high peak value of 02 was detected for each contact was several tens of △ or less, and it was found that It was found that the coating layer was more than an order of magnitude thinner than the thickness of the coating layer at the contact where the resistance increased during operation. These things are true for Au, Ag,
For alloys made of Pd, it has been shown that if the oxygen-based coating layer is on the order of several tens of amperes, it does not have a large effect on contact resistance and can also avoid adhesion between metals.
In the mixed atmosphere of 3 types of 102 and 10 days 2, stable characteristics can be obtained because the growth of the coating layer is maintained in an equilibrium state due to the oxidation-reduction action of 02 and 10 days 2 even if the operation is repeated many times. Figure 3 shows N2,02 which is an embodiment of the present invention.
(20%) and a string in a three-type mixed gas atmosphere. FIG.

At a day 2 concentration of 1 pm (day 2/02 concentration ratio 5 x 10-5), the contact resistance will increase in the case of materials with poor corrosion resistance, as in the case where day 2 is not mixed, but at a day 2 concentration of 10 other pm
(5/02 concentration ratio 5×10-4) or more, the contact resistance becomes stable for all three types of contact points. The lower limit of the 4/02 concentration ratio at which the contact resistance becomes stable depends on the corrosion resistance of the bush point material, but in the case of a material with poor corrosion resistance, the /02 concentration ratio may be increased.

On the other hand, the concentration ratio of 2/02 on the day is the explosive limit (for 0220%, 2
×10-1), but the allowable concentration ratio for day 2/02 to obtain stable contact resistance without adhesion is at least over a relatively wide range from the order of 10-3 to the order of 10-1. Therefore, it can be put to practical use even if manufacturing precision is taken into account. The gases tested were N2,02 and H2, but other inert gases such as He, other oxidizing gases such as Q02,
Similar characteristics are shown for other reducing gases such as CO.

As explained above, the contact system is heated with an inert gas such as N2,
By sealing with an oxidizing gas such as No. 2 and a reducing gas such as No. 2, it is possible to obtain a stable contact resistance without adhesion, which has the advantage of increasing the reliability and long life of the contact.

In addition, even if the alloy contains base metals and has poor corrosion resistance, if the concentration ratio of reducing gas to oxidizing gas is optimized, it is easy to estimate the scale for practical use, resulting in economical material costs. There is also the advantage of being able to achieve this.

[Brief explanation of drawings]

Fig. 1 shows an example of contact resistance characteristics when the point is operated in a mixed gas atmosphere of N2 and 02 (20%), and Fig. 2 shows an example of N2,02 which is an embodiment of the present invention. Figure 3 shows the contact resistance characteristics of a contact operated in a mixed gas atmosphere of N2,02 (20%) and N2,02 (1%), which is an example of the present invention. FIG. 2 is a diagram showing the dependence of contact resistance on specific concentration in a three-type mixed gas atmosphere on days 2 and 3. Figure/Figure 2 Figure 2

Claims (1)

[Claims] 1. The contact system consists of an inert gas such as N_2, an oxidizing gas such as O_2, and a reducing gas such as H_2, and the concentration ratio of the reducing gas to the oxidizing gas is 5 x 10^
A contact-filled relay characterized in that it is filled with a forming gas of -^4 or more and less than the explosive limit.