JP3509961B2 - Insulation device for inorganic fiber insulation tube - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the baking of a heat insulating cylinder made of an inorganic fiber.
NaruSo on location.

[0002]

2. Description of the Related Art A heat insulating tube made of inorganic fiber such as glass wool is formed by winding a sheet-shaped inorganic fiber around a mandrel serving as a core, forming a pipe shape, and putting it in an oven as it is.
The binder attached is baked during passage through the oven. This firing is performed by heat transfer from the outside surface of the heat-retaining cylinder to the ambient temperature in the oven and heat conduction inside the heat-retaining cylinder, and surface heat transfer of the heat retained by the heated mandrel and heat-retaining inside the heat-retaining cylinder. It is carried out by both transmission.

[0003]

However, the inorganic fiber such as glass wool used as a material is originally a heat insulating material, and therefore the heat conduction in the heat insulating cylinder made of such a material is slow, and the firing is not completed. It is necessary to secure a certain amount of time. For this reason, in order to increase the production speed in the baking using the conventional oven and to secure the baking time of the binder, it is common to lengthen the oven, but according to the length of the oven, the mandrel There was a problem that the capital investment such as increasing the number of

In order to increase the production speed and increase the production in a short oven in order to prevent the excessive capital investment,
A common method is to raise the temperature in the oven and the temperature of the mandrel, but this method often causes the temperature transmitted to both the inner and outer surfaces of the heat retaining cylinder to become too high, and the binder on the surface deteriorates due to heating, which However, this may cause a problem of degrading the quality of the heat insulation cylinder itself (properties such as surface strength, compression, friction, etc.). For example, with this type of heat insulating cylinder, the width of 50 to 1 is applied at the stage before surface treatment during construction.
Although a 00 mm tape is wound around, if the surface strength is deteriorated, the heat insulating cylinder may be dented when the tape is wound around and the thickness may be reduced.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a method and an apparatus for baking an inorganic fiber heat insulating tube which enables increase in production with a relatively small capital investment.

[0006]

In order to achieve the above-mentioned object, the baking apparatus for an inorganic fiber heat insulating tube according to claim 1 forms the inorganic fiber into a pipe, puts it in an oven, and passes through the oven. In a baking device of an inorganic fiber heat insulating tube for baking a binder attached to the inorganic fiber between, a hot air blowing device for blowing hot air to the inside of the heat insulating tube after passing through the oven , The hot air blowing device
Heats from both sides of the heat retaining tube into the heat retaining tube.
A pair of nozzles for blowing air is provided, and the nozzles are
The tip part to be inserted into the heat retaining cylinder and the end of the heat retaining cylinder.
Part of the chucked is obtained by the so that with a flange portion for preventing the escape of heat.

According to a second aspect of the present invention, there is provided an apparatus for firing a heat retaining tube made of an inorganic fiber.
There, the ear portion of the thermal insulation cylinder both end portions of the above hot-air blowing device
The trimming process is installed before the trimming process .

[0008]

Embodiments of the present invention will be described with reference to the drawings.
Figure 1 is a perspective view showing a main part of the baked NaruSo location of inorganic fibers made heat insulating tube according to the present invention, FIG. 2 is the enlarged sectional view, FIG. 3 is a schematic diagram showing a manufacturing system of the inorganic fibers made of heat insulating cylinder .

First, the manufacturing system shown in FIG. 3 will be described. In the figure, reference numeral 1 is a fiberizing device for making the molten glass into a fibrous shape, and the fibrous glass (hereinafter simply referred to as fibrous glass) 2 is sprayed with a binder and uniformly distributed on the conveyor 3. Then, it is conveyed to the constant-size cutting section 4. The sizing cutting unit 4 cuts the conveyed fibrous glass 2 into a predetermined length to obtain a desired product thickness.

Then, the cut fibrous glass 2 is wound around a mandrel 5 to form a tubular body, that is, a heat retaining tube 10, which is then transferred into an oven 6 to burn the attached binder.
This baking is carried out while being conveyed by the conveyer 7 in the oven 6, and as described above, heat transfer from the outer surface of the heat insulating cylinder 10 at the ambient temperature in the oven 6 and heat conduction in the heat insulating cylinder,
The heat retained by the mandrel 5 heated in the oven 6 is transferred by both surface heat transfer and heat transfer in the heat retaining cylinder. Then, after the treatment in the oven 6 is completed, the mandrel 5 is pulled out from the heat insulation cylinder 10 in which the binder near the surface layer is baked at the decoreing portion 8 and discharged to the outside of the oven 6.

The heat insulation cylinder 10 discharged to the outside of the oven 6 is heated by a hot air blowing device 2 by a conveying means such as a conveyor (not shown).
Transfer to 0. The hot air blowing device 20 includes a bucket conveyor 22 having a number of angled receivers 21 provided on the upper surface thereof.
And a plurality of pairs of nozzles 23 for blowing hot air into the heat insulating cylinder 10 mounted on the receiver 21, and a hot air source 24 for supplying hot air to the nozzles 23. Of course the oven 12
The heat insulating cylinder 10 may be directly discharged from the oven 12 onto the bucket conveyor 22 without interposing a conveying means between the hot air blowing device 20 and the hot air blowing device 20.

The nozzle 23 of the hot air blowing device 20 is not shown in the drawing, but is provided by an appropriate means and the bucket conveyor 22 is provided.
The tip portion 25 is provided with a tip portion 25 that can be moved back and forth with respect to the upper heat retaining cylinder 10 and that is inserted into the heat retaining cylinder 10 and a flange portion 26 that chucks the end portion of the heat retaining cylinder 10 to prevent heat from escaping. The hot air is blown into the inside of the heat insulating cylinder 10 to accelerate the firing of the binder. Of course, nozzle 2
The number, structure, shape, dimensions, etc. of 3 are not limited to those in the example shown in the figure, and appropriate ones can be adopted. In FIG. 3, 27 is a flue gas duct, and 28 is a flue gas cooling facility for treating flue gas generated in the oven 12 and the hot air blowing device 20.

The operation of the hot air blowing device 20 will be described. The heat insulating cylinder 10 being conveyed by the bucket conveyor 22 is stopped when it reaches a predetermined position, and the nozzle 23 is moved to the heat insulating cylinder 10.
Projecting to the side and inserting the tip portion 25 into the heat insulating cylinder 10,
The ends of the heat insulating cylinder 10 are chucked from both sides between the brim portions 26, 26, and hot air from the hot air source 24 is blown into the heat insulating cylinder 10. The hot air passes from the inner surface to the outer surface of the heat insulating cylinder 10 to accelerate the firing of the binder. Hot air temperature is 1
50-300 ° C., preferably 180 ° C.-250 ° C., pressure 0.5-6 kg / cm 2, preferably 2-4 kg / c
The m2 and the air volume may be 2 to 50 m3 / min, preferably 5 to 20 m3 / min in terms of room temperature. With such use, it is expected that the productivity will be improved by about 40% while maintaining the conventional quality.

Regarding the hot air blowing device 20, the heat insulating cylinders 10 are stored in a batch manner on the bucket conveyor 22.
A method of blowing a plurality of nozzles at once or intermittently stopping the heat retaining cylinder 10 conveyed by using an intermittent conveyer or the like, and inserting / removing the nozzle 23 at each stop to connect a plurality of nozzles 23 to a single heat retaining cylinder. A method of blowing hot air multiple times intermittently can be adopted. Further, in the production of the heat insulating cylinder made of an inorganic fiber such as glass wool, the steps of trimming for cutting both ears after firing, forming slits by cutting in the vertical direction, packaging, etc. are continued (in the illustrated example, the bucket conveyor 22 The band saws 29, 29 are provided at the end of the so that the conveyor for the trimming process is integrated.) In the present hot air blowing device 20, since it is difficult to promote the firing of both ends of the heat insulating cylinder 10 from the structure, the ears It is desirable to install the trimming process before the trimming process, so that softening of the product end due to chucking pressure can be prevented.

Although the above-mentioned embodiments have described only the fibrous glass, the present invention is not limited to fibrous glass, and includes fibers themselves or various similar substances.

[0016]

As described above, in the method for firing a heat retaining tube made of an inorganic fiber and the apparatus according to the present invention, the existing oven is left as it is, and then hot air is blown into it. Without overheating of the equipment and deterioration of the binder inside and outside the heat insulation cylinder by increasing the temperature of the oven and deterioration of strength, the firing of the unbaked binder can be completed in a short time with a relatively small capital investment, and production is increased. Has the effect of enabling. Also, by preventing binder deterioration and strength reduction,
It is possible to suppress the generation of scratches and scratches on the surface of the heat insulating cylinder during transportation and construction, which improves workability, improves the compressive strength of the surface, and prevents dents when winding tape on the surface. There is also an effect that it becomes easy to maintain a predetermined thickness.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of a method and an apparatus for baking an inorganic fiber heat insulation tube according to the present invention.

FIG. 2 is an enlarged sectional view of the same.

FIG. 3 is a schematic view showing a manufacturing system of a heat insulating cylinder made of an inorganic fiber.

[Explanation of symbols]

1 Fiberizing equipment 2 Fibrous glass 3 conveyors 4 Sizing section 5 Mandrel 6 oven 7 conveyor 8 decoreing part 10 Cylindrical body (heat retaining cylinder) 20 Hot air blowing device 21 Receiving 22 bucket conveyor 23 nozzles 24 Hot air source 25 chips 26 brim 27 Smoke exhaust duct 28 Smoke exhaust cooling equipment 29 band saws

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-11096 (JP, A) JP-A-63-259040 (JP, A) JP-A-5-60291 (JP, A) JP-A-4- 219360 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 59/05

Claims (2)

(57) [Claims] 1. A baking apparatus for an inorganic fiber heat insulation tube, which comprises molding inorganic fibers into a pipe shape, placing it in an oven, and baking a binder adhering to the inorganic fibers while passing through the oven. Equipped with a hot air blowing device for blowing hot air into the heat insulating cylinder after passing through the inside ,
The hot air blowing device is provided from both sides of the heat insulation cylinder.
Equipped with a pair of nozzles for blowing hot air into the heat insulation cylinder
The tip part where the nozzle is inserted into the heat retaining cylinder.
And chuck the end of the heat insulation tube to prevent heat escape
Baking apparatus of the inorganic fibers made of heat-insulating cylinder, characterized in Rukoto includes a Rutsuba portion. 2. A device for firing a heat insulating cylinder made of an inorganic fiber according to claim 1.
Te location smell, the heat insulating tube at both ends of the above hot-air blowing device
A baking device for a heat insulating cylinder made of an inorganic fiber, which is installed before the trimming process of the ear part of the .