JPH0518465A - Sealing structure for vacuum device - Google Patents

Abstract

PURPOSE:To facilitate mounting and removal of a lid side seal member by furnishing an extra dovetail groove for O-ring at the periphery nearer the atmosphere side than a dovetail groove for O-ring provided in a body side seal member, fitting a round cord packing loosely to a rubber tube, and fitting this rubber tube in the extra dovetail groove. CONSTITUTION:A dovetail groove 3 for O-ring is provided in the plane 2 of a body side seal member 1, and therein an O-ring 4 is fitted, and on the side nearer atmosphere than the dovetail groove 3 for O-ring, a plane 5 is formed with a level difference provided relative to the first named plane 2. This plane 5 is furnished with an extra dovetail groove 6 for O-ring, and if a rubber tube 8 with a round cord packing 7 fitted loosely, is fitted in this groove 6, the sealing surface of the rubber tube 8 will be positioned higher than the sealing surface of O-ring 4. A lid side seal member 9 is placed on the abovementioned body side seal member 1, and evacuation of a back empty vessel is commenced. When the lid side seal member 9 is pressed, the rubber tube 8 is put in tight attachment thereto, and the air-tightness in the initial period of evacuation can be kept. The lid side seal member 9 is pressed by the atmospheric pressure, and the O-ring 4 is put in tight attachment thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum device seal structure, and more particularly to a vacuum device seal structure in which a vacuum container body and a lid-side seal member are easily attached and detached.

[0002]

2. Description of the Related Art As shown in FIG. 3, a vacuum container of a conventional vacuum apparatus has a 0 ring 4 fitted in a dovetail groove 3 for a 0 ring of a main body side seal member 1, and a sealing surface is attached to the 0 ring 4. It has a sealing structure for tightly sealing the lid-side sealing member 9 it has. In order to bring the seal surface into close contact with each other, the tightening metal fittings 12 are provided at equal intervals over the entire outer circumference of the seal portion, and the tightening handle 13 is adjusted so that the compressive force acts evenly on the seal surface.

[0003]

In this conventional vacuum container, in order to bring the lid-side seal member into close contact with the O-ring fitted to the main body-side seal member, the lid-side seal member is tightened at equal intervals over the entire outer circumference thereof. I had to install metal fittings. Also,
If the opening area becomes large, the flatness of the main body side sealing member and the lid side sealing member will be inferior in processing accuracy, and a large compression force will be required to improve the close contact of the sealing surface. In addition, there is a problem that the number of man-hours must be increased and a lot of man-hours are required to attach and detach the lid-side seal member.

An object of the present invention is to provide a sealing structure for a vacuum device, which does not require a tightening fitting and can easily attach and detach the lid side sealing member.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a vacuum in which a 0-ring dovetail groove of a main body side seal member is fitted with a 0 ring, and a lid side seal member having a sealing surface is tightly sealed to the 0 ring. In the device seal structure, another O-ring is provided on either one of the outer periphery of the main body side seal member on the atmosphere side of the groove for the 0 ring and the outer periphery of the lid side seal member on the atmosphere side. It is characterized in that a rubber tube having a dovetail groove provided therein and a string packing loosely inserted in the dovetail groove for the 0 ring is fitted.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, a 0-ring dovetail groove 3 is provided on a flat surface 2 of a main body side seal member 1 and a 0-ring 4 is fitted therein. When a flat surface 5 is formed by providing a step with the flat surface 2 on the atmosphere side, a flat groove 5 for 0 ring is further provided on the flat surface 5, and a rubber tube 8 into which a round string packing 7 is loosely inserted is fitted.
The sealing surface of is higher than the sealing surface of the O-ring 4.

Next, the lid-side sealing member 9 is placed on the main-body-side sealing member 1 and the evacuation of the vacuum container is started. At this time, if the lid-side sealing member 9 is lightly pressed by hand, the rubber tube 8 having high flexibility is brought into close contact with the lid-side sealing member 9 and the airtightness at the initial stage of vacuum exhaust can be sufficiently maintained. After a few minutes, the lid-side seal member 9 is pushed by the atmospheric pressure, and the O-ring 4 comes into close contact with the lid-side seal member 9.

FIG. 2 is a sectional view of the second embodiment of the present invention.

In the second embodiment, as shown in FIG. 2, a dowel groove 3 for 0 ring is provided on a flat surface 2 of a main body side sealing member 1 and a 0 ring 4 is fitted thereinto, and a sealing of a lid side sealing member 9 is carried out. Face 10
A flat surface 5 is formed by providing a step with the sealing surface 10 on the more atmospheric side, a dovetail groove 6 for O-ring is further provided on the flat surface 5, and a rubber tube 8 in which a strap packing 7 is loosely inserted is fitted.

Next, when the lid side sealing member 9 is placed on the main body side sealing member 1, the sealing surface of the rubber tube 8 contacts the sealing surface 11 of the main body side sealing member 1, but the sealing surface of the O-ring 4 becomes The lid-side sealing member 9 is in a positional relationship where it does not come into contact with the sealing surface 10. After that, when the vacuum evacuation in the vacuum container is started and the lid side sealing member 9 is lightly pressed by hand, the flexible rubber tube 8 is brought into close contact with the sealing surface 11 of the main body side sealing member 1 and the initial vacuum evacuation is performed. Airtightness can be maintained sufficiently. After a few minutes, the lid-side sealing member 9 is pushed by the atmospheric pressure, and the O-ring 4 comes into close contact with the sealing surface 10 of the lid-side sealing member 9.

In this embodiment, since the rubber tube 8 is fitted to the lid-side seal member 9, when modifying the seal structure of the existing vacuum device, the lid-side seal member 9 which can be separated from the main body side is modified. It has the advantage of being easy.

[0014]

As described above, according to the present invention, the conventional 0
In addition to the ring seal, a flexible rubber tube seal is provided on the atmosphere side of the 0 ring to create a double seal structure, so there is no need for a tightening fitting to bring the 0 ring into close contact with the sealing surface at the initial stage of evacuation. Therefore, there is an effect that the lid side seal member can be easily attached and detached.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a second embodiment of the present invention.

FIG. 3 is a partially cutaway front view of an example of a conventional vacuum device seal structure.

[Explanation of symbols]

 1,9 Seal member 2,5 Flat surface 3,6 With groove 40 Ring 7 Round string packing 8 Rubber tube 10,11 Sealing surface 12 Tightening fitting 13 Tightening handle

Claims (1)

Claim: What is claimed is: 1. A vacuum device for fitting a 0 ring into a groove for a 0 ring of a main body side sealing member, and closely sealing a lid side sealing member having a sealing surface on the 0 ring. In the seal structure, another 0 is provided on either the outer circumference of the main body side seal member on the atmosphere side of the groove for the 0 ring or the outer circumference of the lid side seal member on the atmosphere side.
A seal structure for a vacuum device, comprising a dovetail groove for a ring, and a rubber tube in which a string packing is loosely inserted in the dovetail groove for a 0 ring.