JPH01183620A - Probe for optical fiber - Google Patents

Abstract

PURPOSE:To prevent a temperature drop of a part to be observed by exhausting purge gas of a surplus portion in other direction than the opening direction of an observation use window part and blowing out gas of a correct flow rate for blowing off dust in the window part direction. CONSTITUTION:A head part 9 having hole parts 7, 8 is fixed to the tip part of an outer cylindrical body 5, a window-pane 11 is fixed to the opening ends of the hole parts 7, 8, and an observation use window part 3 and an illumination use window part 4 are formed. Cooling water reaches a bead part 9 from an inlet hole 18, flows out of an outlet hole 19 and cools a cooling pipe 1. Also, to a gap between a first pipe 5a and a cylindrical body 6, purge gas G flows from an inlet hole 20, reaches the head part 9 and blown out of the hole parts 7, 8, blows off dust of the window parts 3, 4, and also, executes cooling. On the other hand, on the extreme tip of the head part 9, a gas escape hole 22 which can be adjusted is provided, and adjusts a flow rate of the hole parts 7, 8 by exhausting surplus gas. In such a way, it is prevented that a part to be observed A is cooled by gas.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber probe equipped with a purge mechanism to protect a fiber scope and the like used in a high-temperature atmosphere such as in a high-temperature furnace.

[Conventional technology and its problems]

First, the structure of this type of optical fiber probe is such that a purge gas is ejected onto the surface of the observation window to blow off dust in the high-temperature atmosphere to keep the area in front of the observation window clean. Furthermore, this purge gas also has a cooling effect near the tip of the fiberscope.

By the way, for example, if the tip of the probe has an illumination lamp, this lamp generates a lot of heat, and in order to cool the lamp, a flow rate higher than the flow rate required to blow away the dust (see above) is sent into the probe. Must be. Alternatively, (although there are various conditions for high-temperature atmospheres), if the atmosphere is relatively clean with little dust, but the amount of radiant heat is significantly large, the probe will be cooled for $5. )) A flow rate greater than that required without blowing out fB must be pumped into the probe.

Conventional optical fiber probes have a structure in which purge gas is ejected in the direction of the opening of the observation window. A large amount of purge gas such as air or nitrogen gas blows out strongly and cools down the observed area, causing the problem that the observed area cannot be observed under high-temperature usage conditions.

[Means for solving problems]

The present invention has an observation window section equipped with a flow path section for ejecting purge gas from the surroundings on the surface of the observation window, and a relief section for ejecting an excess amount of the purge gas in a direction different from the opening direction of the window section. A hole was opened.

[Effect]

Although the area to be observed exists in the opening direction (front) of the observation window, the excess purge gas is ejected in a direction different from this opening direction, and the dust is ejected in the window opening direction (front). It becomes possible to eject the necessary appropriate flow rate without blowing out, and prevents the temperature of the observed area from decreasing.

〔Example〕

Hereinafter, the illustrated embodiment will be described as i'P.

In FIG. 1, the reference character ``■'' indicates a fiber probe, which is an example of a side-viewing probe, and specifically includes a cooling pipe C. The cooling pipe C is placed over the fiberscope 2 to protect it from the high temperature atmosphere, as shown by the phantom line.

H is the tip of this cooling pipe C, and is provided with an observation window 3 and an illumination window 4. Moreover, the cooling pipe C has an outer cylinder body 5 and an inner tube t, ? It consists of an i-body G.

That is, a head portion 9 having a hole 7.8 that is open in a direction perpendicular to the axis is fixed to the tip of the outer cylinder 5, and an inner cylinder tip storage is provided in which the tip of the cylinder 6 is accommodated. The interior of the head section 9 is divided into a section 7a and a lamp storage section 8a in which an illumination lamp 10 made of a tungsten halogen lamp or the like is accommodated. Window glasses 11 are provided at the opening ends of the holes 7 and 8, respectively. II is fixed, and the observation window section 3 and the illumination window section 4 are formed.

To attach the window glass 11 to the hole 7.8, as shown in FIG. ring 13
The window glass 11 is fixed and held by IJ. and,
As shown in FIG. 8, the stepped portions 14 of the holes 7 and 8 and the contact surface 15 of the presser ring 13 are completely cut out except for presser protrusions lG and 16 at two locations on the circumference. Then, the flow path portion 17 is formed. In particular, as shown in FIG. 7, the gap size T of the flow path section 17 on the side of the III purging ring 13 is set to be sufficiently small, and the jetting speed of the purge gas G such as air or nitrogen gas is increased, even though the flow rate is small. Achieve sufficient dust blowing effect.

Thus, the outer peripheral body 5 is composed of a first pipe 5a, a second pipe 5b, and a third pipe 5C arranged concentrically in order from the inner diameter side,
Cooling water enters from the cooling water port 18 at the base end, flows as shown by the arrow, reaches the head part 9, passes through a flow path (not shown in detail) formed in the head part 9, and then turns back and reverses the direction shown in the same figure. The water flows as shown by the arrow, flows out from the cooling water outlet hole 19, and enters the cooling pipe l.
is cooled. Further, the purge gas G flowing from the first purge gas artificial hole 20 flows into the cylindrical gap between the first pipe 5a and the inner cylinder body 6, and reaches the tip +(.

By the way, in the most extreme surface wall 21 of the head part 9, there is a relief hole part 2 for ejecting the excess amount G3 of the purge gas G in the axial direction.
2 will be established. In the embodiment shown in FIG.
The opening degree-adjustable hole portion corresponds to the foregoing hole portion 22.

Here, the flow rate supplied from the purge gas inlet hole 20 is G
If the flow rates ejected from the customer window 3 and the lighting window 4 are Gl and G2, then the remaining 11-minute flow rate G3 ejected from the above-mentioned opening hole 22 is expressed by the following equation. In other words, c3=Go Gl -02"'=""■.

Generally, radiant heat from the external high temperature atmosphere is absorbed by the glass 11. 1 through the illumination lamp 1.
0 generates a considerable amount of heat, so a large supply flow rate Go is required for cooling.

However, depending on the atmosphere, il'[i! However, there are cases where it is relatively clean □ cases where there is little dust - In such cases, the purge gas flow rate from window 3.4 G+
, G2 are set to a small amount, and window 3. is applied to the observed area.
This prevents the purge gas G ejected from 4 from hitting and cooling the area to be observed.

In the embodiment of FIG. 1 in which the valve 23 is provided, the amount of dust,
It can be said that there is an advantage that the surplus flow rate G3 can be adjusted in accordance with the distance between the windows 3 and 4 to the observed part.

Note that an inclined reflection mirror 28 is attached to the tip of the inner cylinder 6 to form a side-viewing fiberscope.

Next, FIGS. 2 and 3 show examples of Haku, I! I] First, a large hole 24 is penetrated through the tip surface of the head portion 9 of the tip 61H of the cooling pipe C constituting the probe 1, and an excess amount of purge gas G3 is spouted through the hole by means of a bolt 25 or the like. An exhaust plate 26 having an escape hole portion 22 consisting of a plurality of small holes is fixed.

If the exhaust plate 26 is removably fixed with bolts 25 or the like as in the park, the surplus flow rate G3 can be easily changed depending on the usage conditions such as the atmosphere. The jetting flow rates Gl and G2 can be adjusted. It also has the advantage that the hole 24 can be used for replacing or repairing the lamp 10. In FIG. 2, the lamp 10 cord pipe 27 is inserted into the first tube 5a of the outer cylinder 5 together with the inner cylinder 6. The rest of the configuration is the same as in Figure m1.

Next, another embodiment shown in FIG. 4 has a structure in which the illumination lamp 10 of the previous embodiment is omitted.

That is, the distal end 11 of the cooling pipe C is provided with only the observation window 3, and the distal end 81 of the cylindrical body 6 is accommodated in the accommodation section 7a therein. An excess amount G3 of the purge gas G is generated in a direction different from the direction in which the window portion 3 opens 11, i.e., toward the tip of the shaft center.
In the example shown in FIG. 0, an exhaust plate 26 is installed in the leading edge 21 forming the cooling channel tip 29.
Alternatively, a hole 22 is formed in the most extreme surface Xi21 itself to form an exhaust plate part, and the excess purge gas G3 is spouted out.

(Note that in FIG. 4, a part of the flow path through which the cooling water of the head portion 9 flows is clearly shown.) In this embodiment, the following equation holds true.

(';']=Go Gl・・・・・・・・・■Furthermore, FIGS. 5 and 6 show another example.
is equipped with a water-cooled tube C for direct viewing, the head portion 9 of the tip 11 has a circular hole with the tip storage portion 30 of the direct viewing fiberscope 2 as the axis, and the H-way window portion 3 is provided with a water-cooled tube C for direct viewing. It is provided on the tip 81 surface of the head portion 9. Purge gas that blows away dust in front of the window glass 11 is ejected as indicated by arrow G1.

The surplus spouting hole portion 22 is arranged in a direction perpendicular to the axis.
It is opened in the radial direction, and in particular, it is provided avoiding the cooling water small hole passages 31 and 32 formed in large numbers in the head part 9. Of course, the escape hole portion 22 may be formed of a plurality of holes. In this embodiment as well, the above equation 0 holds true.

It should be noted that the present invention is not limited to the illustrated embodiment and is of course free to change the design, and the cooling pipe C may be configured to use only air cooling, or it may be a direct-view fiberscope and It may also be equipped with an illumination lamp. In addition, the escape hole 22 is in a direction different from the opening direction of the observation window 3, and the excess G is placed in the observed Fill A.
Since it is sufficient if 3 does not match, it is also free to set the two jet directions so that they form an acute angle or an obtuse angle in addition to forming a right angle. Furthermore, it goes without saying that a sensor such as an optical fiber thermometer may be used instead of the optical fiber scope.

〔Effect of the invention〕

The present invention is used in a high-temperature atmosphere such as in a high-temperature furnace, and
It is now possible to observe the Ii temperature observation area under the high temperature conditions of use.

1B1: When the atmosphere is high but the area in front of the observation window is relatively clean, or when a large cooling flow rate with purge gas is required, In cases where less blowout is required, the purge gas flow is supplied at 9G. The surplus G3 inside is spouted out from the relief hole 22 to create a proper flow! 1G1 observation window 3
(Also, an appropriate flow rate 07 can be ejected from the illumination window section 4), and along with this, to the observed part located in front of the observation window section 3 (and furthermore, the illumination window section 4), Cooling can be prevented with purge gas. The present probe structure is also useful when delicately controlling the flow m of purge gas.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing one embodiment of the present invention, and FIG.
The figure is a cross-sectional side view of Haku's embodiment, ff13 is a front view of the main part, FIG. 4 is a cross-sectional side view of another embodiment, FIG. 5 is a cross-sectional side view of yet another embodiment, and FIG. FIG. 5 is a sectional view taken along the line Vl--Vl, FIG. 7 is a sectional view of a main part, and FIG. 8 is a plan view of the same sectional view. l...Probe, 2...Fiber scope, 3...
- Observation window section, 9... Head section, 22... Escape hole section, A... Observed section, C... Cooling pipe, G, Go, G
r, 02...Purge gas (flow rate). Patent applicant: Nippon Steel Corporation
Above: Mitsubishi Cable Industries, Ltd. Figure 8

Claims (1)

[Claims] 1. An observation window section having a flow path section for ejecting purge gas from the surroundings on the surface of the observation window, and an escape hole section for ejecting excess purge gas in a direction different from the opening direction of the window section. An optical fiber probe characterized by the following.