JPH0753593B2 - Inorganic melt supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for producing inorganic fibers such as rock wool and glass wool by a multi-stage rotary drum type centrifugal device, in which a raw material inorganic melt is a first stage rotary drum. Related to the device for supplying to.

[Conventional technology]

Conventionally, as a technique for supplying an inorganic melt, for example, there is a rotating disk type fiberizing device, in which the inorganic melt from the melting furnace is received by an auxiliary tundish and a tundish and dropped from a hole below (Japanese Patent Publication No. 58-34,565) or a method in which an inorganic melt is once introduced from a spinneret into a reservoir provided in close contact with the side wall of a rotating drum, and the inorganic melt is supplied from the reservoir to the side wall of the rotating drum ( Japanese Patent Publication 47-1890
No. 2) is proposed. However, the former method is a rotating disk type fiberizing device and does not relate to the multi-stage rotating drum type fiberizing device to which the present invention is applied, and the latter method is such that the drum axis direction of the rotating drum is vertical. However, the inorganic melt is supplied from the lateral direction, and does not relate to the multistage rotary drum type fiberizing apparatus which is the subject of the present invention.

Then, in the multi-stage rotary drum type centrifugal fiberizing device to which the present invention is applied, as a method of supplying the inorganic melt to the first stage rotary drum, generally, a method of making it flow down in a parabolic shape through a supply gutter is used. Has been adopted.

[Problems to be solved by the invention]

However, the conventional method using the supply gutter as a means for supplying the raw material inorganic melt to the multistage rotating drum type centrifugal fiberizing device has the following problems.

That is, in the conventional method of supplying the inorganic melt to the multistage rotary drum type centrifugal fiberizer through the supply gutter, a wave is generated at a point where the inorganic melt flows into the supply gutter, and this wave is caused by a fluctuation in flow rate. It propagates to the tip of the supply gutter. Furthermore, a solidification layer is generated on the contact surface between the supply gutter and the inorganic melt,
It grows and causes flow rate fluctuations. Also, when a cupola having a large fluctuation in the melting rate is used as the raw material melting means, it goes without saying that this fluctuation cannot be eliminated up to the tip of the supply gutter.
Then, such a fluctuation in the flow rate of the inorganic melt changes the parabolic flow track from the tip of the supply gutter to the first-stage rotating drum, and the fluctuation of the downflow position on the first-stage rotating drum and the downflow of the inorganic melt. It appears as a change in diameter. Furthermore, if the stable downflow supply of the tread surface of the first-stage rotating drum to the heated red tropical zone is disturbed by fluctuations in the downflow position and downflow diameter, it will be supplied to the cold surface outside the red tropical zone. (Shot) is increased and the fiberizing yield is deteriorated.

Then, conventionally, for large flow rate fluctuations that are visually discerned, a method of extending the tip of the supply gutter in a parabolic shape has been adopted, but even in this case, it is basically a parabola, and in the supply gutter, Fluctuations in the flow-down position and fluctuations in the flow-down diameter in the first-stage rotating drum due to solidified layer growth and flow rate fluctuations cannot be eliminated.

Furthermore, as a result of detailed analysis of the centrifugal fiberization process by an experiment using an ultra-high speed camera, even when it is judged that the downflow position on the first stage rotating drum is stable with the naked eye,
Actually, the flow-down position fluctuates, and the fluctuation is increased in the subsequent stages after the second-stage rotating drum, the amount of unfibrinated material (shot) is increased, and the fiberization yield is greatly increased. Turned out to affect.

In addition, it is necessary to spread the inorganic melt over most of the tread surface of the rotating drum as a means to improve the fiberization yield, but the tip of the supply gutter is made to have a wide concave shape and the inorganic melt flows down flatly. However, since it is flat and thin, it is disturbed by the wind generated with the high-speed rotation of the rotating drum.
There was a problem that the purpose could not be achieved at all by the supply from the supply gutter.

[Means for solving problems]

The present inventors have conducted various experiments and analyzes in order to solve the above problems, and provided a receiver between the supply trough of the inorganic melt and the first stage rotary drum, and in the receiver. By letting the retained inorganic melt flow down vertically from the hole at the lower end directly to the tread surface of the first-stage rotating drum, the fluctuation of the flow-down position and the fluctuation of the flow-down diameter are completely eliminated, and the non-fibrous material (shot) The present invention has been completed by finding that reduction in the amount and improvement in the fiber yield can be achieved.

That is, the present invention has a heat-insulating layer and a heat-insulating layer in combination with a heat-insulating layer or a heat-resistant layer in which a heat-insulating layer or a heat-generating body is embedded in the peripheral wall downstream of an inorganic melt supply gutter with a protective layer in contact with the melt being separated from the peripheral wall to form a bottom portion. A receiver having a nozzle hole is disposed in the bottom of the receiver, and the first stage drum of the multi-stage rotary drum type centrifugal fiberizing device is disposed below the receiver with the axial direction thereof being horizontal and accumulated in the receiver. The inorganic melt supply device is configured to directly flow vertically down through the nozzle hole toward the tread surface of the first-stage rotary drum.

In the present invention, the receiver is made of a metal having a peripheral wall portion having a heat-insulating layer or a heat-insulating layer made of a refractory in which a heat-insulating layer is embedded with a protective layer in contact with the melt and a heat-insulating layer, and a nozzle hole at the bottom. A nozzle member formed of a nozzle tip and a water cooling jacket for cooling the nozzle tip periphery, and a heating element formed by a wall surface having a heat insulating layer with a peripheral wall portion separating a protective layer in contact with the melt or a protective layer. It is preferable that the pot member is formed of a wall surface having a heat generating layer and a heat insulating layer made of a buried refractory in combination and is detachably attached to the upper portion of the nozzle member. And by making the pot member attachable and detachable in this way, it is possible to easily respond to changes in the retention height of the inorganic melt when the size of the nozzle hole of the nozzle tip and the flow rate of the inorganic melt are changed, Also, the walls of the pot member and the nozzle member are
The surface in contact with the melt is formed of a heat and corrosion resistant material such as a graphite carbon plate, silicon carbide or high alumina, and a heat insulating material such as a ceramic fiber is provided on the outside thereof, or a refractory such as a high alumina castable. Providing a heating layer in which a heating element such as a Kanthal wire (Mo-Si-based heating element) is embedded in a refractory, and a heat-resistant heat insulating material such as ceramic fiber, silica fiber, alumina fiber, or carbon fiber is provided outside the heating layer. By providing a heat insulating layer and constructing a casing made of a heat resistant material such as iron at the outermost portion thereof, it is possible to prevent generation of a solidified substance during storage of the melt and clogging of the nozzle. Further, when the receiver is installed, it is located at the downflow position of the supply gutter and above the tread surface of the first-stage rotating drum, and the vertical downflow line of the inorganic melt and the first-stage rotating drum are in the same plane. It is better to do so.

Further, in the above nozzle tip, since it is necessary to widely supply the inorganic melt to the tread surface of the first stage rotating drum in order to improve the fiberizing yield, a plurality of nozzle holes should be formed in the axial direction of the drum. It is better to provide them side by side in a direction parallel to. Further, in order to efficiently cool the contact surface between the inorganic melt and the nozzle member to suppress the growth of the solidified layer within a predetermined range and at the same time to ensure the nozzle diameter, the nozzle tip and the water cooling jacket for cooling the nozzle tip periphery are It is desirable to use a metal material having a high thermal conductivity, and it is preferable to use, for example, pure copper.

By the way, the nozzle tip needs to be in close contact with the water cooling jacket for cooling the nozzle periphery at the bottom of the nozzle member in order to prevent melting damage, but if it is integrated with the water cooling jacket for cooling the nozzle periphery by welding, etc. When the nozzle tip needs to be replaced, complicated work such as replacement and attachment / detachment of the nozzle member itself is required.Therefore, the inner wall surface shape of the water cooling jacket for cooling the nozzle is formed into a funnel shape, and the shape of this nozzle tip is changed. It has a truncated cone shape,
It is preferable that the taper surfaces are closely attached. Then, at this time, there is no particular need for means for holding the nozzle tip, but when there is a problem of processing accuracy or distortion, a method of sandwiching a material having large thermal conductivity and easily deformed in the joint surface is also used. It is also preferable that a fine silver powder or a fine copper powder having a coefficient of thermal expansion close to that of copper, which is made into a paste with a liquid dispersion medium, alcohols or the like, is applied to the joint surface and then adhered thereto.

[Work]

According to the method and the apparatus of the present invention, when supplying the inorganic melt to the first-stage rotating drum of the multi-stage rotating drum type centrifugal fiberizing device, the inorganic melt supplied from the supply gutter is temporarily received by the receiver. As a result, it is possible to completely prevent the fluctuation of the flow-down position and the fluctuation of the flow-down diameter, and further it is possible to prevent the generation of the solidified product due to the temperature decrease in the receiver. As a result, it is possible to reduce clogging of nozzle holes and the amount of shots generated, and to improve the fiber yield.

〔Example〕

Hereinafter, the method of the present invention and the apparatus therefor will be specifically described based on the embodiments shown in the accompanying drawings.

FIG. 1 and FIG. 3 show an inorganic melt supply device of a multistage rotary drum type fiberizing device according to an embodiment of the present invention. This inorganic melt supply device is composed of a receiver 3 disposed between an inorganic melt supply gutter 1 and a first stage rotary drum 2a of a multi-stage rotary drum type fiberizing device 2, and The receiver 3 is formed of a silicon carbide protective layer 7 whose peripheral wall contacts the melt, a heat insulating layer 9 made of ceramic wool on the outer side thereof, and a casing on the outer side thereof, and the bottom of the receiver 3 has a nozzle hole 6 formed therein. It is formed by the nozzle tip 5 having The nozzle tip 5 is closely attached to the inner wall surface of the water-cooling jacket 4 in a funnel-shaped truncated cone shape with a tapered surface. The surface of the melt is heated by a ring-shaped downward burner to prevent the surface from solidifying.

The arrangement relationship between the receiver 3 and the first-stage rotating drum 2a is such that the inorganic melt vertically flowing down from the nozzle of the receiver 3 is positioned with the drum axis direction horizontal and the tread surface of the first-stage rotating drum 2a. It is designed to hit directly. The nozzle tip 5 and the water cooling jacket 4 are both made of pure copper. FIG. 3 is a plan view of the nozzle tip 5.

Then, when the inorganic melt is supplied to the first-stage rotary drum 2a of the multi-stage rotary drum type fiberizing device 2 using this supply device, the flow 8 of the inorganic melt supplied from the supply gutter 1 is in the receiver 3. Stored in the nozzle tip 5 and then flows downward from the nozzle hole 6 provided in the nozzle tip 5 into a vertical flow, directly hits the tread surface of the first-stage rotating drum 2a, and then centrifugally separated from the first rotating drum 2a. It is blown by force and sequentially hits the rotating drums 2b, 2c, 2d of the second and subsequent stages to be made into fibers.

Since the wall of the receiver 3 is composed of a heat insulating layer made of ceramic wool, with a silicon carbide protective layer interposed therebetween, the melt solidifies inside due to the heat quantity of the melt continuously entering from above. Moreover, the solidified product does not peel off to cause nozzle clogging. As shown in the drawing, solidification is likely to occur at portions other than the downflow point on the surface, so it is more complete if only the surface is heated by the downward ring burner 10 or the like.

FIG. 2 shows a high alumina castable refractory 16 in which a heat generating body 15 made of a Kanthal wire is embedded in the receiver 3 with a protective layer 13 made of silicon carbide in contact with the molten material at the peripheral wall of the receiver 3 and the outside thereof. Nozzle member 3a formed by a heat insulating layer 14 made of ceramic wool and a casing outside thereof, the bottom of which is a water cooling jacket 4 having a cone-shaped inner wall and a nozzle tip 5 fitted to the taper. A high-alumina castable refractory 12 in which a heating element 11 made of a kanthal wire is embedded, a heat insulating layer 9 made of ceramic wool on the outside thereof, and a casing on the outside thereof, with a protective layer made of silicon carbide in contact with the melt at the peripheral wall portion. And a pot member 3b which is detachably attached to the upper portion of the nozzle member 3a. The receiver 3 and the first-stage rotary drum
The arrangement relationship with 2a is such that the inorganic melt flowing down vertically from the nozzle of the receiver 3 directly contacts the tread surface of the first stage rotary drum 2a positioned with its drum axis direction horizontal. In this receiver 3, the nozzle tip 5 and the water cooling jacket 4 at the bottom of the nozzle member are made of pure copper. By making the receiver 3 detachable from the nozzle member and the pot member in this way, when the size of the nozzle hole or the flow rate of the molten material is changed, the height of the molten material is retained by changing the pot member. Can easily respond to changes in.

Then, when the inorganic melt is supplied to the first-stage rotary drum 2a of the multi-stage rotary drum type fiberizing device 2 using this supply device, the flow 8 of the inorganic melt supplied from the supply gutter 1 becomes the nozzle member 3a. And once stored in the pot member 3b, and then flows down as a vertical flow 17 from the nozzle hole 6 provided in the nozzle tip 5 that constitutes the bottom of the nozzle member 3a.
The tread surface of the multi-stage rotary drum 2a is directly contacted, and then is blown by the centrifugal force of the first rotary drum 2a to sequentially contact the rotary drums 2b, 2c and 2d of the second and subsequent stages to be fiberized.

Next, FIG. 4 shows a modified example of the nozzle tip 5,
Two nozzle holes 6 are formed in the nozzle tip 5 side by side in a direction parallel to the drum axis of the first-stage rotary drum 2a. As shown in FIG. 5, the tread of the first-stage rotary drum 2a is formed. The flow becomes two flows perpendicular to the surface and flows down, and the supply width of the inorganic melt to the first-stage rotary drum 2a increases. Also,
FIG. 6 shows a nozzle tip 5 used when it is desired to further widen the supply width of the inorganic melt to the first-stage rotary drum 2a, and the four nozzle holes 6 are parallel to the drum axis of the first-stage rotary drum 2a. Are installed side by side.

Next, in order to confirm the curing of the present invention, a test example will be described in which the inorganic melt was supplied using only the supply gutter, and the inorganic melt was supplied using the above-mentioned supply device.

The nozzle tip 5 has a nozzle hole diameter of 25 mm, and the raw material inorganic melt is supplied under the conditions of 1,400 ° C. at the tip of the supply gutter 1, viscosity of about 13 poise, and flow rate of 4 tons per hour, and the inorganic melt in the receiver 3 The test was conducted with the retention height of the product being 136 mm. As a result of this test, according to the feeding method according to the present invention, the amount of unfibrinated material (shot) having a diameter of 300 μm or more was reduced by 45% as compared with the case of the feeding gutter directly used as a control, and the fiberizing yield was increased. Also improved by more than 5%. Further, there was no difference between the temperature of the inorganic melt immediately before flowing into the receiver 3 and the temperature flowing down from the receiver 3, and almost no temperature decrease was observed.

〔The invention's effect〕

According to the present invention, in the multi-stage rotary drum type centrifugal fiberizing method, it is possible to easily achieve the basically important stabilization of the supply position and the supply diameter of the inorganic melt to the first stage rotary drum, It is possible to prevent the generation of non-fibrous material and improve the fibrous yield.

Furthermore, according to the present invention, by measuring the liquid surface position of the inorganic melt that has accumulated in the receiver, the flow rate or flow rate of the inorganic melt can be easily detected from the relationship between the flow rate and the retention height. , No need to use conventional complicated and expensive equipment.

[Brief description of drawings]

FIG. 1 is an elevational view showing a multi-stage rotary drum type fiberizing device to which a feeding device according to an embodiment of the present invention is applied, and FIG. 2 shows a receiver separable into two parts, a nozzle member and a pot member. ,
Further, an elevational view of an embodiment of the present invention in which a heating means is provided on the peripheral wall portion, FIG. 3 is a plan view showing the nozzle tip of FIGS. 1 and 2, and FIG. 4 shows a modified example of the nozzle tip. FIG. 5 is a plan view, FIG. 5 is an explanatory view showing a state in which the inorganic melt flows down when the nozzle tip of FIG. 4 is used, and FIG. 6 is a plan view showing another modified example of the nozzle tip. 1 ... Supply gutter, 2 ... Multi-stage rotating drum type fiberizing device, 2a
...... 1st stage rotating drum, 3 …… receiver, 3a …… nozzle member, 3b …… pot member, 4 …… water cooling jacket, 5 ……
Nozzle tip, 6 ... Nozzle hole, 7,13 ... Protective layer, 8 ...
… Melt distribution from gutter, 9,14 …… Insulation layer, 10 …… Melt surface heating burner, 11,15 …… Heating element, 12,16 …… Refractory,
17 …… Vertical flow from the receiver to the first rotating drum.

Claims (3)

[Claims] 1. A combination of a heat-generating layer and a heat-insulating layer made of a refractory in which a heat-insulating layer or a heat-generating element is embedded in the peripheral wall downstream of a supply gutter of the inorganic melt with a protective layer in contact with the melt being separated from the peripheral wall, and a bottom portion. A receiver having a nozzle hole is provided in the receiver, and a first-stage drum of a multi-stage rotary drum type centrifugal fiberizing device is provided below the receiver with the drum axis direction thereof being horizontal. An inorganic melt supply device, characterized in that the retained inorganic melt flows down vertically from a nozzle hole toward a tread surface of a first-stage rotary drum. 2. The receiver comprises a heat-generating layer made of a refractory material in which a peripheral wall portion is formed of a heat-insulating layer with a protective layer in contact with the melt, or a heat-generating body is embedded with a protective layer in between, and the outside thereof. A nozzle member formed of a heat insulating layer and a bottom portion of which is formed of a metal nozzle tip having a nozzle hole and a water cooling jacket for cooling the nozzle tip periphery, and a peripheral wall portion which separates a protective layer in contact with the melt. A pot member which is formed of a heat insulating layer or is formed of a heat-resistant layer made of a refractory in which a heat-generating body is embedded with a protective layer interposed between the heat-generating layer and a heat insulating layer outside the heat-generating layer, and which is detachably attached to the upper portion of the nozzle member. The apparatus for supplying an inorganic melt according to claim 1, which is configured. 3. The inorganic melt according to claim 1, wherein the nozzle tip has a plurality of nozzle holes arranged in a direction parallel to the axial direction of the drum. Supply device.