JPH036888Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure-resistant fiberscope that is effective for observing the interior of chemical reaction vessels, furnaces, etc., which are mainly under high pressure (for example, 3 to 130 kg/cm ² ).

The following configuration can be considered as a typical airtight structure of a fiberscope. In Fig. 1, a pressure tube 2 is inserted into a partition wall 1 that separates a high pressure interior from a normal pressure exterior while maintaining airtightness, and the tip of the pressure tube 2 protruding into the high pressure interior while maintaining airtightness. A window plate 3 made of quartz glass is fixed. Furthermore, pressure tube 2
A protective tube 4 is inserted into the protective tube 4, and an image guide 7 for image transmission made of a group of quartz optical fibers with lenses 5 and 6 arranged at both ends is inserted into the protective tube 4. However, in such a structure, the image guide 7 is covered with a double structure (pressure tube 2 and protection tube 4), which makes the structure complicated.

In addition, in Fig. 1, excluding the pressure tube 2, the protective tube 4
It is also possible to create an airtight structure between the lens 5 on the objective side and the lens 5 on the objective side, but in that case, it is necessary to create an airtight structure in the narrow part between the usually small lens 5 and the protective tube 4, which reduces workability etc. Considering this, it is difficult to implement and may not have sufficient mechanical strength against pressure.

In view of the above-mentioned problems, the present invention aims to provide a fiberscope having an airtight structure that is simple in structure and easy to manufacture by filling the gap between the protective tube and the image guide with an airtight agent. , will now be explained based on the drawings.

FIG. 2 is a schematic longitudinal side view of the fiberscope according to the present invention, in which a partition wall 10 separating a high-pressure interior and a normal-pressure exterior has an airtight layer 11 made of epoxy adhesive, RTV (room temperature vulcanized silicone rubber), etc. The protection tube 12 is directly inserted and supported through the. An image guide 13 formed into a solid shaft shape by a large number of parallel glass fibers is inserted into the protective tube 12, and an objective lens 14 is installed at the high-pressure inner end, and an eyepiece 15 is installed at the outer end. is located.
Furthermore, the gap 1 between the protection tube 12 and the image guide 13
6, a portion of the image guide 13 on the same plane as the partition wall 10 is filled with an airtight agent 17 made of epoxy adhesive, foamed urethane, or the like.

Here, light from an internal object to be observed (not shown) enters the image guide 13 through an objective lens 14, and enters the image guide 13 from an external eyepiece 15.
Observations via 3 can be made.

According to the configuration shown in FIG. 2 above, compared to FIG. 1, there is no need to provide the pressure tube 2 and the window plate 3, and the configuration is not only simplified, but also compared to the case where the objective lens 14 part is made into an airtight structure. It has the advantage that airtightness can be maintained easily. Note that the airtight agent 17 is applied to the partition wall 10.
Since it is placed in the same position as the airtight structure, the airtight structure can be enlarged, making it easier to maintain airtightness.
Being integrated with the airtight layer 11 has the advantage of ensuring sufficient mechanical strength against pressure. In particular, even when a material that does not have airtightness, such as a metal flexible tube, is used as the protection tube 12, airtightness can be easily maintained.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal side view of a conventional fiberscope, and FIG. 2 is a schematic longitudinal side view of a fiberscope according to the present invention. 12...Protective tube, 13...Image guide, 17...Airtight agent.

Claims (1)

[Scope of utility model registration request] An objective lens 14 for receiving light from an object to be observed is disposed at one end of an image guide 13 inserted into the protective tube 12 with a gap 16 in between, and an eyepiece 15 for observing through the image guide 13 at the other end. The protection tube 12 is placed in the hole of the partition wall 10 and the airtight layer 11 is placed.
A pressure-resistant fiberscope characterized in that a gap 16 between a protection tube 12 and an image guide 13 at the same position as the airtight layer 11 of a partition wall 10 is filled with an airtight agent 17.