JPS6242209Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to observe the inside of containers, pipes, etc., especially high-pressure containers, piping, etc. covered with heat insulators, cold insulators, etc. The observation surface is the outer wall surface of the container, pipe, etc. This invention relates to a viewing window that is attached to the outer wall of a container, pipe, etc. so that it is located at a more distant location.

First, an example of a conventional high-pressure viewing window will be explained based on FIG.

In FIG. 1, reference numeral 1 indicates a viewing window mounting portion which is an outer wall of a high-pressure device or piping. 2 is the viewing window body, 3
is a cap, 4 is a glass rod with a brim for a viewing window, 5
The O-ring 6 is a gasket.

To assemble the viewing window, insert an O into the O-ring groove of the viewing window body 2.
Fit the ring 2, insert the glass rod 4 for the viewing window, and place the gasket 6 on the viewing surface of the glass rod 4 for the viewing window.
and tighten cap 3.

Pressure sealing of the viewing window is carried out by compressing the O-ring 5 which is in contact with the lower surface of the glass rod 4 for the viewing window by tightening the cap 3.

The gasket 6 serves as a buffer material between the cap 3 and the viewing window glass rod 4 when the cap 3 is tightened.

The reason why the glass rod 4 for the viewing window is shaped with a brim as shown in Fig. 1 is that the viewing window glass rod 4 can be easily attached to the viewing window mounting part 1 during installation without reducing the field of view of the viewing window.
This is to prevent it from falling into the interior.

Note that F is a heat insulating material.

In the observation window shown in Fig. 1, which has been conventionally used to observe the inside of high-pressure equipment or piping covered with heat insulating material F or cold insulation material, etc., the observation surface and inner surface of the glass rod 4 for the observation window are used. Since the distance is large, the field of view of the viewing window is made as wide as possible, and a collar is provided on the observation surface side of the viewing window glass rod 4 to prevent the viewing window glass rod 4 from falling into the container or piping during installation.
Since pressure sealing is achieved between this collar surface and the O-ring 5 fitted into the groove provided in the viewing window body 2, the necessary functional purpose of the viewing window can be achieved, but when tightening the cap 3 or using Due to vibrations of equipment and piping, etc. that occur inside, and pressure fluctuations, the neck of the flange of the glass rod 4 for the viewing window is prone to crack C, making it difficult to use it as a viewing window for high-pressure vessels, piping, etc. due to safety and functional considerations. There was a problem.

Therefore, the present invention was made with the purpose of providing a viewing window with a structure that has a wide field of view, excellent high-pressure sealing performance, and can be used safely. A cylindrical viewing window body is fixed to the opening, and a glass rod with a diameter slightly smaller than the inside diameter of the viewing window body is inserted into the viewing window body so that the objective end of the glass rod is at approximately the same position as the inner surface of the outer wall. The end of the glass rod on the eyepiece side is expanded in a continuous taper shape from the outer diameter of the glass rod, and a ring-shaped guide is fitted to fit with the tapered part of the glass rod, and the ring-shaped guide is connected to the seal plate. Then, a second O-ring is inserted into the space formed by contacting the end surface of the viewing window body via the first O-ring and surrounded by the ring-shaped guide, the seal plate, and the tapered part, and connecting the glass rod. A viewing window is provided in which the eye end face and the other end face of the ring-shaped guide are pressed together by a cap via a gasket.

The eyepiece side end of the glass rod used in the viewing window of the present invention is tapered continuously from the diameter of the objective end. Therefore, there are no corners where stress concentration tends to occur, and the glass rod will not be damaged by the force generated by vibration or tightening.

A seal plate that contacts the window body and a ring-shaped guide that fits with the tapered portion of the glass rod are fitted to the glass rod. The first O-ring is disposed between the window body and the seal plate, and the second O-ring is disposed between the window body and the seal plate.
The ring is disposed in a space surrounded by the tapered portion of the glass rod, the ring-shaped guide, and the seal plate. The first O-ring is crushed between the window body and the seal plate, and performs a surface seal of the gap between the glass rod and the window body.

Since the second O-ring is crushed between the above three members, its "squashing margin" is large, and performs shaft sealing of the gap between the glass rod and the window body.

In this way, by forming the part that fits into the tapered part of the glass rod as a separate ring-shaped guide, it becomes possible to arrange two O-rings, and a face seal structure and a shaft seal structure are incorporated. This also improves sealing performance.

Next, the present invention will be specifically explained based on an embodiment shown in FIG.

In FIG. 2, reference numeral 1 indicates a viewing window mounting portion on the outer wall of a high-pressure vessel or piping. 2 is the viewing window body, 3 is the cap, 4 is the glass rod for the viewing window, 5 and 7 are O
A ring, 6 a packing, 8 a guide, 9 a seal plate, and 10 a presser foot.

The end of the viewing window glass rod 4 on the eyepiece side is widened in a tapered shape to such an extent that it does not fall into the viewing window main body 2 from the viewing window mounting part 1.

The guide 8 is a ring-shaped member that supports the tapered portion of the glass rod 4 for the viewing window, and a notch into which the O-ring 7 is inserted is provided on the surface in contact with the glass rod 4 for the viewing window. The seal plate 9 is connected to the guide 8
An O-ring 5 is inserted between the seal plate 9 and the viewing window main body 2, and also between the seal plate 9 and the viewing window main body 2.
is mediated.

The viewing window having the above structure is assembled as follows.

Fit the O-ring 5 into the groove of the viewing window body 2, then fit the viewing window glass rod 4 into the guide 8, and pass the O-ring 7 from the tip of the viewing window glass rod 4 to the notch of the guide 8 and the viewing window glass rod. 4, and fit the seal plate 9 from the tip of the viewing window glass rod 4.
Insert the assembly assembled in this way into the viewing window main body 2, and attach the packing 6 and presser foot 1.
0 and screw and tighten cap 3.

A part of the observation surface of the glass rod 4 for the viewing window is widened in a tapered shape, and unlike the one shown in Fig. 1, the angle of the widened part is made gentler, so there is no possibility of vibration or tightening at the neck of the widened part. The inner surface of the guide 8 is machined to have the same slope as the widening part of the glass rod 4 for the viewing window, and by fitting it, the glass for the viewing window can be opened. The rod 4 is prevented from falling into the interior from the viewing window mounting part 1, and the seal plate 9 crushes the O-ring 5 by the tightening force of the cap 3, and the viewing window body 2
The O-ring 7 fitted between the lower notch of the guide 8 and the viewing window glass rod 4 is also pressed to prevent leakage in the radial direction of the guide 2. It has a shaft seal structure that seals the
The sealing effect is increased, and when the cap 3 is tightened through the presser foot 10, the gasket 6 prevents the viewing surface of the viewing window glass rod 4 from being covered. It functions as a buffer material that absorbs discrepancies in the surfaces of the rods 4.

In addition, the presser foot 10 functions to uniformly transmit the tightening force of the cap 3 to the viewing window glass rod 4 and the guide 8, and to ensure the sealing by the O-rings 5 and 7.
Depending on the internal pressure of the container or piping, etc., the glass rod for the viewing window 4
prevent it from slipping out.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional viewing window, and FIG. 2 is a front sectional view of one embodiment of the present invention. 1... Peep window mounting part, 2... Peep window body, 3...
...Cap, 4...Glass rod for viewing window, 5, 7...
...O-ring, 6...Putskin, 8...Guide, 9
... Seal plate, 10 ... Presser foot.

Claims (1)

[Scope of utility model registration request] A cylindrical viewing window body is fixed to an opening in an outer wall that has a heat insulating material installed on the outside, and a glass rod having a diameter slightly smaller than the inner diameter of the viewing window body is inserted into the viewing window body at the objective end of the glass rod. The end of the glass rod on the eyepiece side is continuously expanded in a tapered shape from the outer diameter of the glass rod, and the end of the glass rod is inserted so that the end thereof is approximately at the same position as the inner surface of the outer wall. A ring-shaped guide is fitted so as to fit together, and the ring-shaped guide is in contact with the end surface of the viewing window main body via the seal plate and the first O-ring, and the ring-shaped guide, the seal plate, and the tapered part are connected to each other. A second O-ring is inserted into the space formed by the glass rod, and the eyepiece end face of the glass rod and the other end face of the ring-shaped guide are pressed by a cap via a packing. A viewing window featuring