JPS62113316A - Contact switchgear - 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] 〔Technical field〕 This invention relates to a relay having a current-carrying switching function.

This relates to contact opening/closing devices such as switches.

[Background technology]

In conventional contact switching devices such as relays, the contact drive section and the contact movable section are mounted on a body block with terminals protruding from the bottom surface, and then a plastic case is placed over the body block to remove the contact drive section.

Since it only covered the movable part of the contact, it had a low airtightness, and the structure was such that surrounding gas could easily penetrate. Therefore, in a sulfiding gas atmosphere, the contacts are easily sulfurized, leading to an increase in contact resistance and shortening the life of the contact switching device.

Therefore, various relays with improved airtightness have been proposed in the past, but there have been problems in that the sealing process is complicated and the cost increases due to an increase in the number of parts such as sealing materials.

[Purpose of the invention]

An object of the present invention is to provide a contact switching device that can improve the sulfidation resistance simply by using N and has high reliability.

[Disclosure of the invention]

The contact opening/closing device of the present invention is a contact 1mrA device in which a contact driving part and a contact movable part mounted on a body block are covered with a plastic case placed on the body block. This is characterized in that a metal layer with a high ionization tendency is provided on at least one of the re-contact surfaces.

As described above, according to the present invention, since a metal layer with a high ionization tendency is provided on the bottom of the plasti, case, and/or the top of the body block, this metal layer is sulfurized in a sulfidic gas atmosphere, and the sulfurized metal is The layer increases the adhesion between the bottom of the plastic case and the top of the body block, preventing gas from entering the inside of the plastic case, thereby preventing sulfidation of the contact portion. Therefore, it is possible to easily improve sulfidation resistance and provide high reliability without using a sealing material or the like.

Embodiment An embodiment of the present invention will be explained based on FIGS. 11EI to 3. That is, as shown in FIG. 1, this contact opening/closing device includes a contact drive section and a contact movable section (not shown) mounted on a body block 1 with terminals 3 attached to a plastic plate covered with the body block 1. In the contact opening/closing device covered with the plastic case 2, a metal layer 4.5 having a high ionization tendency is provided on the re-contact surfaces of the plastic case 2 and the body block 1, respectively.

As the gold rIi and N4.5, a plating layer of Cu, Ag, etc. can be suitably employed. FIG. 2 is a bottom view showing the metal layer 5 formed on the bottom contact surface of the plastic case 2. As shown in FIG. Further, metal scraps 4 on the body block l are also provided on the upper abutting surface of the plastic case 2 facing the metal layer 5. In FIGS. 1 and 2, metal layers 4, 5
is shown by hunting.

FIG. 3 is a front view showing the assembled state of the contact switching device of this embodiment. As shown in the figure, when the body block 1 and the plastic case 2 are assembled, they come into contact with each other via both metal layers 4.5. In this state, the contact switching device of this embodiment is connected to H, S and S.
When placed in a sulfidic atmosphere such as 02, the metal layer 4.5
Sulfurization is promoted, and the plastic case 2 and body block 1 are brought into close contact (bonded) via the sulfurized metal layer 4.5, resulting in a structure in which the inside of the plastic case 2 is sealed. Incidentally, when the metal layer 4.5 is a copper plating layer, it reacts with the surrounding H2S gas to perform the following reaction.

2Cu + Has = Cu2S, +
Therefore, it is possible to prevent the intrusion of sulfiding gases such as 11□S and SO2, and prevent sulfidation of the contact portion, thereby increasing the life of the contact portion and providing high reliability. Furthermore, since there is no need for a sealing process using a special sealing material, there is an advantage in that the number of processes can be reduced and costs can be reduced compared to conventional sealed contact switching devices.

A plating layer of Cu or 8g can be created by the process shown in FIG. However, the imaginary line A shown in Figure 4
The metal layer of the present invention is not limited to only a metal plating layer (a metal layer formed by a metal vapor deposition method, a sputtering method, etc.) may be used. Alternatively, a thin metal film may be attached to the flower.

In this embodiment, the metal layer 4.5 is provided on the re-contact surfaces of the plastic case 2 and the body block 1, but the same effect can be obtained by simply providing a metal layer on either one of the abutment surfaces. I can do it.

〔Effect of the invention〕

According to the invention, the bottom of the plastic case and/or
Alternatively, since a metal layer with a high ionization tendency is provided on the top of the body block, this metal layer becomes sulfurized in a sulfidic gas atmosphere, and the sulfurized metal layer increases the adhesion between the bottom of the plastic case and the top of the body block. This prevents gas from entering the inside of the plastic case, thereby preventing sulfurization of the contact portion. Therefore, it becomes possible to easily and inexpensively improve sulfidation resistance and provide high reliability without using a sealing material or the like.

Next, connect other contact switching devices (relays) to Figures 5 to 7.
This will be explained based on the diagram. FIG. 5 is a developed view of the plastic case, and FIG. 6 is a perspective view of the plastic case showing its assembled state. As shown in these figures, this contact switching device has a metal layer 11 having a high ionization tendency partially provided on the inner circumferential surface 10a of a plastic case 10.

Further, a similar metal layer 12 is provided on the entire inner surface of the upper plate 10b of the plastic case 10. The reason why the metal Jiff is partially provided on the inner circumferential surface 10a is that if the distance between the plastic case 10 and the internal current-carrying part (not shown) is small, there is a problem with the withstand voltage. Due to the problem with the withstand voltage of the relay itself (3 kV or more for 1 minute of AC), a metal layer 11 is installed in the part where there is a distance of 1 to 2 u or more from the current-carrying part.
It is preferable to apply However, as long as there is no problem with the withstand voltage, it goes without saying that it may be provided over the entire inner circumferential surface 10a.

Moreover, the metal layer 12 on the inner surface of the upper plate 10b can be omitted if necessary. Furthermore, the plating layer 11 on the inner circumferential surface does not necessarily have to be provided over the entire height B of the plastic case 10;
It is also possible to use a structure in which a metal layer is provided up to (indicated by arrow C in the figure). This is because sulfidic gases such as H, S and SO□ have a higher specific gravity than air.

Because of this structure, in a sulfuric atmosphere,
Even if sulfide gas enters the inside of the plastic case 10,
Since the metal such as Cu is sulfided, sulfidation of the contact portion is suppressed, and as a result, the life of the contact can be increased.

In addition to the metal layer provided on the inner surface of the plastic case 10', FIG.
It has been established. Therefore, the degree of sulfidation progress of the inner metal layer can be easily determined by the outer metal layer 13. For example, when sulfurization reaches the point indicated by arrow M shown in FIG. 7, caution is required; It can be used as a lifespan management display that allows you to easily know that it needs to be replaced due to the end of its life when sulfidation reaches this point.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2 is a bottom view of the plastic case, Fig. 3 is a front view of the assembled state, and Fig. 4 shows the process of forming the metal layer fitting R). 5 is a developed view of the plus deck case in another contact opening/closing device, and FIG. 6 is a perspective view showing its assembled state.
FIG. 7 is a perspective view of another plastic case.

Claims (2)

[Claims] (1) In a contact opening/closing device in which a contact driving part and a contact movable part mounted on a body block are covered with a plastic case placed on the body block, at least one of the contact surfaces of the plastic case and the body block is A contact switching device characterized by having a metal layer with a high tendency to ionize. (2) Claim No. 2, wherein the metal layer is a plating layer (
The contact opening/closing device described in item 1).