JPH0442733Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a front seal mechanism for instruments such as pressure gauges whose cases are filled with oil.

PRIOR ART

The conventional front seal mechanism for oil-filled instruments has been to place an O-ring on the upper end of the case and press-fit a glass onto the O-ring. In the case of this conventional example, the upper end surface of the case must be formed wide, a sealing mechanism cannot be provided using a thin material such as stainless steel, and a specially made sealing rubber is required. It had drawbacks such as rapid deterioration because it was strongly pressed against the glass.

[Problem that the invention attempts to solve]

Therefore, with this invention, a sealing mechanism can be provided even in a case made of thin material, and a commercially available O-ring can be used.Furthermore, the pressure on the O-ring due to the glass is not applied unnecessarily, and the O-ring This paper attempts to propose a sealing mechanism for oil-filled instruments that is free from the risk of deterioration.

[Means for solving problems]

Therefore, in this invention, a receiving stage is formed inside the upper part of the case, a guide ring having an L-shaped cross section is placed on this receiving stage, and an O-ring is placed in the groove formed by the inner surface of the case and the guide ring. Furthermore, by fixing the glass in contact with the O-ring, the oil-filled instrument was sealed.

[Effect]

The oil-filled instrument with the above structure does not have an O-ring placed on the upper end of the case, so it can have a sealing mechanism even if the case is made of thin material, and the O-ring has a circular cross-section. Since commercially available products can be used, material costs can be reduced, and the pressing force of the glass can also be received by the upper end of the other case of the O-ring and the guide ring, so no more pressing force than necessary is applied to the O-ring. ,
This will prevent deterioration of the O-ring.

〔Example〕

The configuration of this invention will be explained below with reference to the drawings shown as one embodiment.

Reference numeral 1 denotes a case, and a receiving stage 2 is formed inside the upper part of the case 1. This receiving stage 2 has a cross section L
A letter-shaped guide ring 3 is placed thereon. Therefore,
A groove 4 is formed in a circular shape by the inner surface of the case 1 and the guide ring 3.

An O-ring 5 is disposed in the groove 4, and a glass 6 is fixed in contact with the O-ring 5.

When attaching the glass 6, it is desirable to apply light pressure to the O-ring 5. This is because the sealing effect of the O-ring 5 is sufficient with light pressure, but if more pressure is applied than necessary, the O-ring 5 deteriorates quickly and the sealing effect becomes worse. However, with the above structure, the pressure on the glass 6 is received not only by the O-ring 5 but also by the upper end of the case 1 and the guide ring 3. No pressure will be applied (metal touch).

Note that the reference numeral 7 in the figure is a cover for attaching the glass 6 to the case 1.

The guide ring 3 also serves to reinforce the thin case 1 when it is pressurized from the outside.

[Effects of the invention] This invention has the above-mentioned configuration. Therefore, even if the case 1 is made of a thin material, it can have a sealing mechanism, and a commercially available O-ring 5 can be used. The sealing mechanism of the oil-filled instrument of this invention has excellent practical effects, such as being able to be manufactured at a low cost, and also preventing deterioration of the O-ring 5 because the pressure of the glass 6 is not applied to the O-ring 5 more than necessary. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an outer frame portion of an instrument having a sealing mechanism according to this invention. Figure 2 is an enlarged sectional view of the main part. FIG. 3 is an exploded perspective view. 1...Case, 2...Socket, 3...Guide ring, 4...Groove, 5...O-ring, 6...Glass.

Claims (1)

[Scope of utility model registration request] A receiving stage is formed inside the upper part of the case, a guide ring having an L-shaped cross section is placed on this receiving stage, an O-ring is arranged in the groove formed by the inner surface of the case and the guide ring, and a glass is further placed. A sealing mechanism for an oil-filled instrument characterized by being fixed in contact with an O-ring.