JPS5856450B2 - sealed relay - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sealed relay with a new configuration that is equipped with a check valve that can automatically discharge gas inside the relay to the outside when internal pressure increases. Concerning.

FIG. 1 shows a conventional sealed relay, which is constructed by housing a relay main body Ry in a case 1 and then sealing an opening 1a with a mold member 2 or the like.

Normally, this type of relay was developed for the purpose of protecting the contact portions and the like from various external conditions at the place where the relay is used by cutting off the relay body Ry from the outside air.

However, in such a sealed relay, when the frequency of opening and closing of the contacts increases, green rust tends to occur on the contacts or the yoke in the relay body Ry, which is a major cause of relay deterioration or contact failure.

The inventors of the present invention discovered that the cause of green rust is that ozone is generated inside the case due to arcs generated when contacts are opened and closed, and this ozone is trapped inside the case, and developed a new configuration that eliminates the above factors. This provides a sealed relay.

The present invention will be explained below with reference to the embodiments shown in FIGS. 2 to 4.

FIGS. 2 and 3 show a sealed relay according to an embodiment of the present invention, in which a relay main body Ry is housed in a case 1, and a case opening 1a is sealed with a molded member 2.

According to the present invention, a through hole 1b that communicates with the inside and outside of the case is formed in a part of the horizontal wall surface of the case 1, and a film is used to cover the through hole 1b airtightly from the outside of the case under normal conditions. The distance between the through hole 1b and the peripheral edge 3b of the member 3 is adjusted such that only one end 3a of the shaped member 3 is attached to the surface of the case 1 with an adhesive or the like, and the other part of the member 3 sufficiently covers the through hole 1b. Set t to be sufficiently large.

Therefore, in this type of relay, the through hole 1b is hermetically closed by the film-like member 3 in the normal state, so it is no different from a normal sealed relay.
When the internal pressure inside the case 1 rises above a certain level due to arcs, etc. that occur when the relay contacts open and close, the gas inside the case 1 pushes up the film-like member 3 through the through hole 1b and flows to the outside of the case 1. It is something that is discharged.

Then, when the gas inside the case is exhausted and the internal pressure is lowered, the pushed-up member 3 returns to its original state and seals the case.

Therefore, under normal conditions, the relay's sealing function can be maintained, and ozone etc. will not be trapped inside the case 1, thus solving the above-mentioned problems with conventional sealed relays. It is.

As described in detail above, this invention forms a through hole that communicates with the inside and outside of the case in a sealed relay, and normally seals the through hole with a film-like member in this through hole, and only when the internal pressure of the case reaches a certain level or more. It is attached so as to open the through hole to remove the causes of green rust that occurs on various parts of the built-in relay body, making it easy to configure and inexpensively prevent deterioration of the relay and prevent poor contact. It is something that can be measured.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a conventional sealed relay, FIG. 2 is a longitudinal sectional front view of only the essential parts of a sealed relay according to an embodiment of the present invention, and FIG. 3 is a perspective view of a sealed relay according to the present invention. It is. In the figure, 1 is a case, 1a is an opening, 1b is a through hole, 2
3 is a mold member, and 3 is a film-like member.

Claims (1)

[Claims] 1. In a sealed relay in which the main body of the relay is housed inside the case and the opening is sealed with a molded member, etc., a through hole that communicates with the inside and outside of the case is formed in a part of the case, and the through hole is normally A sealed relay characterized in that a film-like member is attached to the through hole, which opens the through hole so that the gas inside the case is discharged to the outside only when the internal pressure of the case reaches a certain pressure or more.