JPS6128157Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blind lid for a vacuum device, particularly to a structure of a blind lid that can be commonly adapted to flanges of various sizes.

Generally, the connection part of a vacuum device is provided with flanges 5 and 6 at the tips of the conduits 1, 2, 3, and 4, as shown in FIG. , 6 are tightened together to prevent leakage.

The O-ring 7 interposed between the flanges 5 and 6 is an O-ring fitting groove 8 provided on one side of the flanges.
If the device is evacuated by inserting it into the
This prevents the ring from being sucked into the device.

The O-ring fitting groove is formed only on one of the flanges of the connecting portion to prevent leakage due to suction of the O-ring. In the example shown in FIG. 1, the flange 5 does not have a groove, and an O-ring fitting groove is provided on the flange 6 side.

If a leak occurs from either device A or B in a vacuum device having such a configuration, device B is removed from the flange 6, a blind cover is attached to the flange 5, and a leak check is performed on device A.

In this case, as mentioned earlier, the flange 5 is
Since there is no ring fitting groove, an O-ring fitting groove is required on the blind lid. If there is no O-ring fitting groove, the O-ring will be sucked into the inside of the device and leak from the blind lid.

Therefore, a blind cover with an O-ring fitting groove is used, but the conventional blind cover has one O-ring fitting groove per blind cover. A matching blind lid of specified dimensions was prepared. Therefore, in order to perform a leak check on vacuum flanges having different specifications, it is necessary to prepare another blind cover, which is uneconomical.

This invention forms concentric grooves into which vacuum O-rings of different sizes are fitted in the flat metal plate that forms the blind lid, allowing the blind lid to be installed on flanges of various standards by simply replacing the O-ring. It was made possible to achieve the purpose.

FIG. 2 shows an embodiment of the blind lid 10 according to the present invention, in which an O-ring 15 is fitted to the flange 11 of a large vacuum device in the outermost groove 12 formed in the blind lid. At this time, no O-ring is inserted into the O-ring insertion grooves 13 and 14, which have a smaller diameter than the groove 12.

Further, in the example shown in FIG. 3, the blind cover 10 of the present invention is applied to the flange 16 of a small vacuum device, and an O-ring 17 is inserted into the groove 14 of the minimum diameter that fits the flange 16.
is inserted to prevent leaks.

On the other hand, if there are O-ring grooves on the flanges 11 and 16, it is preferable to use the surface C of the blind lid 10 where no grooves are formed. Further, as another embodiment, it is convenient to provide various O-ring grooves on both the front and back sides of the blind lid 10.

As described above, if a blind cover having various O-ring fitting grooves to fit the O-ring according to the size of the flange of the vacuum device is used according to the present invention, there will be no need to prepare many types of blind covers and it will be economical. It is true.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view for explaining a conventional vacuum system, Fig. 2 is a sectional view showing one embodiment of the blind lid of the present invention, and Fig. 3 is a sectional view showing another embodiment of the blind lid of the present invention. FIG. 1, 2, 3, 4... conduit, 5, 6, 11, 16
...Flange, 7, 15, 17...O ring,
8, 12, 13, 14... O-ring fitting groove.

Claims (1)

[Claims for Utility Model Registration] (1) A blind lid for a vacuum flange characterized by forming concentric grooves in a flat metal plate into which vacuum O-rings of different sizes are fitted. (2) A blind lid for a vacuum flange according to claim (1) of the utility model registration, characterized in that concentric grooves are formed on one side of the metal plate and the other side is flat. (3) A blind lid for a vacuum flange according to claim (1) of the utility model registration, characterized in that grooves into which vacuum O-rings of different sizes fit are formed on each side of the metal plate.