JPH0745054Y2 - Cooling protection tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a cooling protection tube having a purging mechanism for protecting a fiberscope or the like used in a high temperature atmosphere such as in a high temperature furnace.

[Problems to be solved by conventional techniques and devices]

Conventionally, as this type of cooling protection tube, one having a structure as shown in FIG. 3 is known.

That is, it has an inner cylinder tube c into which the side-view observation window portion a and the fiberscope b are inserted, a first outer cylinder tube d, and a second outer cylinder tube e, and a cooling water inlet hole f and a cooling water outlet hole. g. However, as is clear from FIG. 3, the cooling water outlet hole g is fixed to the second outer tube e. Therefore, the direction of the cooling water outlet hole g is determined by the direction of the side-view observation window portion a.

Then, as shown in FIG. 3, when the cooling water outlet hole g is directed downward, when the cooling water flows in the order of arrows h, i, j, k, l, an air pool A is generated above. , This air pool A
However, there is a possibility that the inside of the cooling passage may momentarily become high pressure due to expansion at the time of temperature rise, and an accident may occur in which the welded portions m ... Are destroyed.

[Means for Solving the Problems]

In order to solve such a problem, the present invention provides a cooling protection tube having a side-viewing observation window, a cooling water inlet hole, and a cooling water outlet hole, which is rotatable about the axis of the protection tube body. To
The rotating ring body having the cooling water outlet hole was externally fitted to the base end portion of the protective tube main body via a sealing material.

[Action]

The cooling water flows in from the cooling water inlet, cools the vicinity of the side-viewing observation window, and then returns to the cooling water outlet, but the cooling water outlet hole is formed in the upper part of the flow passage where air is likely to accumulate. When the rotary annulus is rotated so as to face, the air mixed in the cooling water flows out from the cooling water outlet hole of the upper portion together with the flow of the cooling water. Since it is externally fitted via the sealant, water leakage between the rotary ring body and the protective tube body does not occur. The side-viewing observation window portion shows various directions and inclinations depending on the observation location (observation situation), and the cooling water outlet hole is most easily discharged by rotating the rotary annulus correspondingly. It is possible to move it to the upper part.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

In FIG. 1, reference numeral 1 denotes a cooling protection tube, which is provided with a side-view observation window portion 3, a cooling water inlet hole 18, and a cooling water outlet hole 19 and is covered with a fiberscope 2 indicated by an imaginary line from a high temperature atmosphere. Protect. The cooling protection tube 1 is provided with an outer cylindrical body 5 and an inner cylindrical body 6 fitted in the outer cylindrical body 5 over substantially the entire length excluding the tip H.

That is, the head portion 9 having the hole portion 7 opened in the direction orthogonal to the axial center is fixed to the tip end portion of the outer cylindrical body 5, and the window glass 11 is fixed to the open end of the hole portion 7, and the observation window portion 3 Is formed.
The purge gas G is jetted outward from the periphery of the window glass 11 of the window portion 3.

The outer tubular body 5 is composed of a first pipe 5a, a second pipe 5b, and a third pipe 5c that are arranged concentrically from the inner diameter side to the outer diameter side,
The first pipe 5a is set to be slightly long and protrudes to the left in FIG. 1, and the base end portion of the third pipe 5c is integrally fixed to the pipe head body 21 by welding or the like. 5a is this piping head body 21
And is fixed by welding 22 or the like to maintain a sealed state.

Further, at the base end of the first pipe 5a, a block body 25 having an axial center hole 23 for inserting the inner cylindrical body 6 and the fiberscope 2 and a purge gas inlet hole 24 orthogonal to this is provided.

Then, the piping head body 21 has a large diameter portion 26 on the distal end side and a small diameter portion 27 on the proximal end side, and an axial hole 28 is formed through both of them.
The base end of the second pipe 5b is fitted in the stepped portion on the tip side of the shaft hole 28, and the inner diameter of the second pipe 5b and the inner diameter of the shaft hole 28 are made to coincide with each other. Also, the small diameter portion 27 is welded to the lid portion 29.
43, and the first pipe 5a is inserted through the hole of the lid 29 to be integrated with the welding 22.
A cylindrical cooling water inflow passage 30 formed by the outer periphery of the pipe 5a and the inner periphery of the shaft hole 28 is covered. The cooling water inlet hole 18 is opened in the small diameter portion 27 of the piping head body 21 in the direction orthogonal to the axial direction and is connected to the cooling water inflow passage 30 so as to communicate therewith.

Reference numeral 31 denotes a short cylindrical rotating ring body having a cooling water outlet hole 19, which is fitted onto the large-diameter portion 26 via sealing materials 32, 32 such as O-rings and is rotatable as indicated by an arrow R. .

More specifically, the outer peripheral surface of the large-diameter portion 26 is provided with the concave peripheral groove portion 33 and the seal grooves 34, 34 on both sides in the axial direction in the vicinity thereof, and the stopper is provided on the outer peripheral tip side of the large-diameter portion 26. Outer collar part 35
Is formed, and the rotary ring body 31 is externally fitted from the base end side. 36 ...
Is a retaining member. The inner peripheral surface of the rotary ring body 31 is a sealing material.
It is possible to rotate while keeping watertightness by sliding contact with 32,32. Further, the large diameter portion 26 is formed with axial communication holes 38 ... Which communicate with the cooling water return passage 37 formed between the second pipe 5b and the third pipe 5c. In the illustrated example, both the cooling water inlet hole 18 and the cooling water outlet hole 19 are formed with a taper screw, and a tapered male screw joint of a pipe (not shown) is screwed on. Then, the outlet hole 19 is formed by welding a base with a taper screw to the rotary ring 31.
An example is shown in which it is formed by being fixed to.

Then, the cooling water that has entered from the cooling water inlet hole 18 of the pipe head body 21 at the proximal end flows to the head portion 9 as shown by the arrow and is formed in the head portion 9 as shown in FIG. 2 and FIG. Through the numerous axial small holes 39 ..., which reach the most advanced confluent vacant chamber portion 40, and turn back from here, through the multiple axial small holes 41 ... And is discharged from the cooling water outlet hole 19 via the communication hole 38 and the concave circumferential groove portion 33.

As is clear from FIG. 1, the inner peripheral surface of the communication hole 38 is
It is preferable that the farthest portion of the cooling protection pipe 1 from the axis is formed so as to coincide with the inner peripheral surface of the third pipe 5c so that the corner where air is accumulated is eliminated.

Further, in FIG. 1, the rotary ring body 31 in the cooling protection tube 1 is shown.
The portion excluding the sealing material 32 is referred to as a protective tube main body 42.

Therefore, the rotary ring body 31 is externally fitted to the base end portion of the protection tube main body 42 (specifically, the large diameter portion 26 of the piping head body 21) via the sealant 32.

When the cooling protection tube 1 configured as described above is used, the direction of the window portion 3 is not limited to the upward direction as shown in FIG. But,
By rotating the rotary ring body 31 relative to the protection tube body 42 as shown by the arrow R, the cooling water outlet hole 19 can be made to correspond to the upper portion where the air in the cooling water is most likely to separate and accumulate. As a result, the air is immediately discharged from the cooling water outlet hole 19 in this upper portion.

The present invention is not limited to the illustrated embodiment, and it goes without saying that the design can be freely changed. For example, it is also possible to add an illumination window portion and an illuminator to the head portion 9, and as a side view. It is also preferable that the axis is not limited to the orthogonal direction but has an appropriate inclination.
Further, in the embodiment of the present invention, the case where the fiberscope is inserted inside the protection tube has been described, but in addition to this, a TV camera, a solid-state image sensor, various detection probes, etc. may be inserted and used appropriately. It is also possible.

[Effect of device]

The present invention solves the conventional problems by the above-mentioned structure, allows the air to easily escape, and effectively prevents the conventional air pool and the damage to the welded portion due to the temperature rise and pressure increase.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention, and FIG. 2 is a lateral sectional view of an essential part. FIG. 3 is a sectional side view showing a conventional example. 1 ... Cooling protection tube, 3 ... Window, 18 ... Cooling water inlet hole,
19 …… Cooling water outlet hole, 31 …… Rotating ring, 32 …… Sealant,
42 …… Protective tube body.

Claims (1)

[Scope of utility model registration request] 1. A cooling protection tube having a side-viewing observation window, a cooling water inlet hole, and a cooling water outlet hole, wherein the cooling water outlet hole is rotatable with respect to the axis of the protection tube body. A cooling protection tube, wherein a rotating ring body having the above is externally fitted to a base end portion of the protection tube body via a sealing material.