JPS6215760Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention relates to an observation probe used to image the condition of materials or contents inside a high-temperature furnace such as a blast furnace, converter, heating furnace, or coke oven. .

Conventional technology In recent years, with the advent of low-loss silica-based optical fibers,
Methods have been devised to directly observe conditions inside high-temperature furnaces. Although the light-receiving surface is exposed to high temperatures, optical transmission enables imaging and other image processing in a favorable environment at a sufficient distance, and is expected to be applied to furnace condition observation.

Such observation probes are exposed to high temperatures as described above, and many objects to be observed are located in furnaces with a lot of dust, so it is necessary to take into account image reception interference caused by dust on the light receiving surface.

In order to monitor the temperature of a high-temperature object, a detection head has been proposed that has an air-cooling air purge function that also takes into account the prevention of radiation light from inside the quartz used in the detection head. (Instrumentation Vol. 25, No. 4, P83).

Since the detection head's cladding and built-in lens and optical rod are made of heat-resistant materials, the usable temperature is as high as 1000°C or less, and the cooling function is comparable.

In addition, triple water-cooled tubes are used for internal observation of high-temperature furnaces, etc. Even when the temperature inside the furnace is 1700℃, the total length of the water-cooled tube is 5m, making it possible to keep the internal scope tip at 100℃, depending on the operating temperature and atmospheric conditions. The use of a purging mechanism with a quartz window at the tip that also serves as cooling has also been disclosed (Instrument Vol. 24, No. 12, P47). However, in this case, the length of the water-cooled tube is long, the device becomes complicated, and sufficient consideration must be given to abnormal reactions with the furnace body material and the substances in the furnace due to water leakage from the water-cooled tube.

Purpose of the invention This invention sufficiently cools the parts exposed to high temperatures.
A light guide that prevents image reception interference due to dust on the light receiving surface, makes the probe tip, which is most susceptible to wear and tear, replaceable, and also takes into account the prevention of blockage of the through hole drilled in the furnace wall for inserting the probe. The objective is to provide an observation probe using

Structure and operation of the invention The structure of the invention consists of a light guide connected to an imaging device, a central tube containing the light guide, and a concentric double tube that surrounds and double protects the central tube through a separate part. A light guide observation probe consisting of a probe tip having a transparent protective window is removably screwed, and a space between the center tube and the inner tube of the concentric double tube, and a space between the central tube and the inner tube of the concentric double tube. A space between the inner tube and the outer tube is formed as a cooling gas passage, and each of these cooling gas passages is provided with a cooling gas outlet formed of an opening facing forward in the vicinity of the tip of the probe. This is an observation probe using a light guide.

An embodiment of the present invention will be described with reference to the drawings.

In Fig. 1, a conductor 1, such as a quartz-based optical fiber, which transmits synchrotron radiation emitted from a high-temperature object with low loss is built into a central tube 2, and its tip, that is, the end on the light-receiving side is , is in contact with a transparent protection window 13, which will be described later, and its rear end is connected to an imaging device, such as a camera. The central tube 2 further includes the central tube 2
It has an inner tube 3 and an outer tube 4 which are concentric double tubes surrounding the
Separators 7 are appropriately inserted into the space 5 between the center tube 2 and the inner tube 3 and the space 6 between the inner tube 3 and the outer tube 4 to maintain a constant gap. A tip 10 (shaded area) is screwed onto the tip of the central tube 2 to form a probe tip.

The chip 10 has a funnel-shaped opening 11 having a sufficient viewing angle θ for the light of the object to be observed to enter,
The tip is formed into a thin hexagonal cylindrical cavity 12, into which a hexagonal wrench is inserted when exchanging the chip, which will be described later.
A transparent protection window 13 is glued to the rear end of the opening 11 to prevent the tip of the light guide from being directly exposed to high heat or contaminated by dust. Since the image to be observed is transmitted through the transparent protection window into the light guide, quartz glass, which is heat resistant and has good light transmittance, is suitable.

A plurality of small holes 14 are provided in the chip 10, and a space 5 is formed.
and the opening 11 so that the fluid can pass therebetween;
When cooling gas flows in, the chip itself is cooled, and the flow of gas into the opening can prevent dust from adhering to the transparent protection window.

A thread is cut on the outside of the inner tube 3, and the tip 10 is screwed into the threaded part 16, and the seal between the tip 10 and the central tube 2 is achieved by a packing groove cut into the tip at the sealing part 17 and a threaded part of the central tube. This is accomplished by compressing and tightly fitting the packing inserted between the packing pressers which are integrated with the chip 2 and fit into the packing grooves by screwing into the inner tube of the chip.

In this way, the space 5 between the central tube 2 and the inner tube 3 is formed with a passageway leading to the opening by the small hole 14, and the space 6 between the inner tube 3 and the outer tube 4 is formed at the distal end. Since the opening 15 can be formed between the chip 10 and the outer tube 4, cooling gas can be pressurized into the space 5 and the space 6 from appropriate parts of the probe, for example, the cooling gas inlets 18 and 19 in FIG. Gas is ejected from the gas ejection port formed by the openings 11 and 15 at the tip of the probe through the aforementioned passage, thereby effectively cooling the tip of the probe.

Furthermore, we will discuss the advantages of jetting cooling gas to the tip of the probe. For example, in a converter, when an observation hole is provided in the furnace wall and the probe is placed to face the observation hole for observation, there is a risk that the observation hole may be clogged due to scattering and adhesion of contents inside the furnace. In such a case, injection of gas from the tip of the probe into the furnace after the probe has cooled is effective to prevent blockage, especially from one of the two passages mentioned above, preferably from the space 6 to the opening 15. By mixing an appropriate concentration of oxygen gas into the gas flowing into the passage that ejects into the furnace through
Blockage can be prevented through a balance between cooling and fixation of the contents by the cooling gas around the observation hole and melting by the heat of reaction with oxygen.

In addition, as mentioned above, if the tip at the probe end becomes worn out due to heat, dust, etc. under the most severe conditions, it can be easily replaced because it is screwed on, and the expensive light guide itself can be replaced. It can be used for a long time. Other examples of the observation probe of the present invention are shown in FIGS. 2 to 4.

Fig. 2A is an explanatory diagram of an observation probe of the type in which the tip and the central tube are screwed together, and the tip and the inner tube are packed and sealed, and Fig. 2B is a front view of the outer periphery of the tip; This indicates that it can be attached and detached by inserting a hex wrench into the outer periphery.

FIG. 3A shows another example of the tip and inner tube screw type, in which the tip and center tube are sealed with a metal touch. FIG. 3B shows that a hexagonal wrench can be inserted into the inside of the chip in the same way as in FIG. 1.

Figure 4A shows another example of the tip and center tube screw type.
FIG. 4B is a front view of the outer periphery of the chip, showing that it can be attached and removed by inserting a hexagonal wrench into the outer periphery of the tip.

Effects of the invention As detailed above, the observation probe according to the invention can withstand high temperatures, prevent interference with image reception due to dust,
It is an extremely useful observation structure that can be used economically over a long period of time by replacing the tip, and can also prevent clogging of the observation hole.

[Brief explanation of the drawing]

Fig. 1A is an explanatory diagram showing an example of the tip-inner tube screw type, Fig. 1B is a front view of the tip showing the square wrench insertion shape, and Fig. 2A is an example of the tip-center tube screw type. Explanatory drawings, FIG. 2B is a front view of the tip showing the shape in which the square wrench is inserted, FIG. 3A is an explanatory diagram showing another example of the tip-inner tube screw type, and FIG. 3B is the shape in which the square wrench is inserted. FIG. 4A is an explanatory view showing another example of the tip-center tube screw type, and FIG. 4B is a front view of the tip showing a shape in which a square wrench is inserted. 1... Light guide, 2... Center tube, 3... Inner tube, 4
... Outer tube, 5 ... Space, 6 ... Space, 7 ... Separate, 10 ... Chip, 11 ... Opening, 12
...Gap, 13...Transparent protective window, 14...Small hole,
15...opening, 16...threaded part, 17...
Seal portion, 18...cooling gas inlet, 19...cooling gas inlet.

Claims (1)

[Scope of utility model registration request] A light guide observation probe consisting of a light guide connected to an imaging device, a central tube containing the light guide, and a concentric double tube that surrounds and double protects the central tube via a separate plate, and is transparent. A space between the center tube and the inner tube of the concentric double tube, and a space between the inner tube and the outer tube of the concentric double tube, to which a probe tip having a protective window is removably screwed. An observation probe using an optical guide, in which cooling gas passages are formed, and these cooling gas passages are provided with cooling gas ejection ports consisting of openings that open toward the front near the tip of the probe.