JPS62138338A - Device for automatically removing deposit - Google Patents

Abstract

PURPOSE:To obtain the titled device capable of preventing the deposition of the reaction residue in a discharge passage at all times and capable of keeping the reaction conditions in a reaction vessel constant by providing a coil scraper which makes contact with the inner wall of the reaction residue discharge passage of the reaction vessel at an obtuse angle. CONSTITUTION:The coiled scraper 12 connected to a rotating mechanism 13 is provided along the inner wall of an exhaust pipe 11 connected to the reaction vessel as a discharge passage. When the scraper 12 is rotated in the direction as shown by the arrow, the stripped deposit can be moved to the discharge side on the left in the figure, since the scraper is coiled. In addition, the cross section of the scraper 12 is made triangular to effectively scrape the deposit, and the contact angle theta with the inner wall surface of the exhaust pipe is made obtuse. Accordingly, since the edge of the scraper 12 comes in contact with the inner wall surface of the pipe 11 at an obtuse angle, the reaction residue deposited on the inner wall surface of the pipe 11 is effectively removed and successively sent out to the discharge side. The residue is further removed by suction air and then treated with a residue treating device.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an automatic deposit removal device that prevents reaction surpluses exhausted from a reaction vessel from adhering and accumulating in an exhaust passage.

<Prior art> When supplying the raw materials and reaction medium necessary for the reaction into a reaction vessel to obtain a predetermined reactant, a reaction surplus is generated.
Generally, an exhaust path is provided for exhausting the reaction surplus by pressure, suction, or natural flow. As an example of such a reaction vessel, a reaction apparatus for producing an optical fiber base material by the VAD method is shown in FIG. As shown in the same figure.

A seed rod 3 is vertically suspended within the reaction vessel 1, and an oxyhydrogen flame burner 2 is installed on the bottom surface of the seed rod 3, facing the seed rod 3. Glass raw materials, etc. are ejected from this ugly hydrogen flame chamber 2 to cause a flame hydrolysis reaction, and the generated glass particles are deposited on the seed rod 3. At the same time, the seed rod 3 is pulled up to remove the porous base material 4. Manufactured. At this time, all of the glass raw materials, glass fine particles, etc. participate in the reaction and do not necessarily adhere to and accumulate on the seed rod 3, and an exhaust passage 5 is attached to the reaction vessel 1 to discharge the remainder as a reaction surplus. ing. This discharge path 5 is connected to a reaction surplus treatment device (not shown), and most of the reaction surplus is sucked into the surplus treatment device through this discharge path 5.

<Means for Solving the Invention> However, in the above-mentioned conventional technology, immediately after the flame hydrolysis reaction, the fine and high-temperature reaction surplus is cooled as it passes through the inside of the exhaust passage 5, and is deposited on the inner wall of the exhaust passage 5. The particles gradually accumulate and may even end up clogging the exhaust path 5. V
What is particularly important in the method for manufacturing an optical fiber base material by the AD method is that the distribution of glass particles in the space from the oxyhydrogen flame burner 2 to the seed rod 3 is formed to have a predetermined refractive index distribution, This distribution of glass particles is maintained without fluctuation for a predetermined period of time. However, as mentioned above, if the reaction surplus adheres and accumulates in the discharge path 5 as deposits 6 and the diameter of the discharge path 5 is pinched, and the discharge path 5 is blocked, the amount of reaction surplus, etc. to be discharged changes, and the amount of glass particles increases. The distribution cannot be maintained as described above, which not only makes it difficult to obtain a predetermined refractive index distribution, but also makes continuous production, which is a feature of the VAD method, impossible.

In this way, in the conventional VAD-based optical fiber base material reaction device, reaction surplus adheres and accumulates in the discharge path 5.
It was not possible to maintain the reaction conditions in the reaction vessel constant, and it was not possible to continuously produce an optical fiber preform having a predetermined refractive index distribution.

In view of the above circumstances, an object of the present invention is to provide an automatic deposit removal device that can prevent reaction surplus materials from adhering and accumulating in a discharge channel and can maintain constant reaction conditions in a reaction vessel. .

<Means for Solving the Problems> The configuration of the present invention to achieve such an object is that in the exhaust path for exhausting reaction surplus from the reaction vessel, the contact angle is obtuse along the inner wall of the exhaust path. The method is characterized in that: 1) the reaction surplus is removed by attaching a coiled scraping body and rotating the coiled scraping body;

Effect> Since the scraping body contacts the inner wall surface of the exhaust passage at an obtuse angle,
When this coiled scraper is rotated, the reaction surplus deposited on the inner wall surface is effectively scraped off.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2.

[As shown in the figure, a coil-shaped scraping body 12 is installed along the inner wall of an exhaust pipe 11 connected to a reaction vessel (not shown) as a discharge path, and this scraping body 1
The scraper body 12 is connected to a rotation mechanism 13 in order to rotate the scraper 2. When this scraping body 12 is rotated as shown by the arrow in FIG. 1, since the scraping body 12 is twisted in a coil shape, the separated deposits will move to the discharge side on the left side in the diagram. . The scraping body 12 has a triangular cross section and an obtuse angle of contact θ with the inner wall surface of the exhaust pipe so that the scraping body 12 can effectively scrape off deposits. Here, as shown in FIG. 2, the contact angle θ is the angle formed by the tangent to the inner wall surface of the exhaust pipe at the position where the scraper of the scraper 12 makes contact.

Therefore, when the rotating mechanism 13 is driven and the coiled scraper body 12 is rotated in the direction of the arrow in FIG. 1, the cutting edge of the scraper body 12 contacts the inner wall surface of the exhaust pipe 11 at an obtuse angle. The reaction surplus deposited on the inner wall surface of the exhaust pipe 11 is effectively scraped down and sequentially sent to the exhaust side, further removed by the intake air, and processed by the surplus processing device. Therefore, the reaction conditions within one reaction vessel can be maintained constant without the exhaust conditions of the exhaust gas -r4r'J changing over time.

<Effects of the Invention> As described above in detail based on the embodiments, in the present invention, a coil-shaped scraping body with an obtuse contact angle is attached along the inner wall of the discharge passage, and the scraping body is constantly scraped off. Therefore, it is possible to prevent the reaction surplus from adhering to the discharge channel.

Therefore, the exhaust conditions such as displacement do not change and the
The reaction conditions inside the reaction vessel can now be maintained constant.

In particular, when the present invention is applied to a reactor using an optical fiber base material using the VAD method, since the exhaust conditions remain unchanged, the distribution of glass particles in the space from the oxyhydrogen flame burner to the seed rod can be changed over time. It is possible to continuously manufacture an optical fiber preform having a predetermined refractive index distribution that can be maintained constant without fluctuation.

[Brief explanation of drawings]

1 and 2 each relate to one embodiment of the present invention! ii. Cross-sectional view and cross-sectional view of the automatic stack white object removal device. Figure 3 is a VAD
1 is a cross-sectional view of a reactor for producing optical fibers by a method; FIG. In the drawing. 1 is a reaction vessel, 2 is an oxyhydrogen flame burner, 3 is a seed rod, 4 is a porous base material, 5 is a discharge channel, 6 is a compost plant, 11 is an exhaust pipe, 12 is a coiled scraping body, 13 is a Rotation mechanism, θ is the contact angle.

Claims (1)

[Claims] In the exhaust passage for exhausting reaction surplus from the reaction vessel, a coiled scraper body with an obtuse contact angle is attached along the inner wall of the exhaust passage, and the coiled scraper body is rotated to eliminate the reaction. An automatic deposit removal device characterized by peeling off excess material.