JP2011208825A - Heat insulating structure for furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating structure which blocks the space between an outer surface of a furnace body and outside air to improve the thermal efficiency of a furnace.SOLUTION: In the furnace 20 in which the temperature of the outer surface of the furnace body 22 becomes 130°C or lower, when a treated object is supplied and heated, a heat insulating material 23 is mounted to the outer surface. The heat insulating material 23 is a plate-shaped member, comprises a member including a plate-shaped heat insulating core and noncombustible paper attached to the surface and back face of the heat insulating core, and is mounted by a magnet to cover the approximately entire surface of the furnace body 22 formed of a steel plate.

Description

  The present invention relates to a heat insulating structure of a furnace such as a heating furnace or a drying furnace.

  Conventionally, a furnace in which a heat insulating material is provided in a furnace body such as a heating furnace or a drying furnace in order to improve heat efficiency and save energy, or shorten work processing drying time and increase work efficiency. For example, a heat insulating structure disclosed in Patent Document 1 below has been proposed.

  FIG. 6 shows the heat insulation structure of the drying furnace shown in Patent Document 1. As shown in this figure, the furnace body 1 of the drying furnace includes a side plate A, a ceiling plate B, and a bottom plate C. Yes.

The side plate A is provided with a plurality of heat insulating units 3 having both side edges covered with C-shaped steel frames 2 and 2, a metal cover plate 4 is fixed on the inner surface side, and angle steels 5 and 5 are provided on the outer surface. The metal covering plate 6 is fixed.
An air layer 7 is formed between the heat insulating unit 3 and the metal cover plate 6.

The ceiling plate B and the bottom plate C are obtained by continuously connecting the heat insulating units 3 having the same configuration as described above, and fixing the metal cover plates 4 and 8 on the inner and outer surfaces thereof.
The furnace body 1 is configured such that the heat conduction inside and outside the furnace body 1 is blocked by the heat insulating unit 3 and the air layer 7.

Japanese Patent Laid-Open No. 8-178531

  However, in the furnace body 1 having the above heat insulation structure, the temperature of the inner metal cover 4 heated in the furnace body 1 in the side plate A is changed to the outer metal cover 6 through the frame 2 and the angle iron 5. In the ceiling plate B and the bottom plate C, the temperature of the heated inner metal cover plate 4 is transmitted to the outer metal cover plate 8 through the frame 2, so that heat is applied from the outer cover plates 6 and 8. There is a problem in that sufficient heat efficiency cannot be obtained due to the release of.

  In addition, when heat is transferred to the outer surface of the furnace body 1 and the temperature is high, care should be taken so that an operator working in the vicinity of the operating drying furnace does not touch the furnace body 1. There was a problem that it was difficult to concentrate work because it was necessary.

  In addition, when the outer surface of the furnace body 1 becomes high temperature and heat is released to the surroundings, the room in which the furnace body 1 is installed becomes high temperature. There is a problem that the cost for cooling to increase the temperature increases.

  Furthermore, when the heat insulation structure needs to be repaired due to deterioration of the heat insulation unit 3, the work of replacing the heat insulation unit 3 becomes large, and there is a problem that time and cost are increased for the repair.

The heat insulating structure for a furnace according to the present invention provides the following means in order to solve the above-described problems.
That is, the heat insulating structure of the furnace according to claim 1 is a furnace in which the outer surface of the furnace body is at a temperature of 130 ° C. or lower when the workpiece is supplied and heat-treated, and the heat insulating material is attached to the outer surface. It is characterized by being.

According to the heat insulating structure of the furnace according to the present invention, the following effects can be obtained by the above-described solving means.
That is, according to the heat insulation structure of the furnace according to claim 1, since the heat insulating material blocks between the outer surface of the furnace body and the outside air, there is an effect that the thermal efficiency of the furnace can be improved.

  Moreover, since the outer surface of a heat insulating material does not become high temperature by arranging a heat insulating material on the outer surface of a furnace body, there exists an effect that it becomes easy for an operator to perform an operation | work in the periphery of a furnace safely.

  In addition, the heat that reaches the outer surface of the furnace body is blocked by a heat insulating material arranged on the outer surface, and the release of the heat around the furnace is suppressed. Can be maintained satisfactorily, and the cooling cost for adjusting the room temperature can be reduced.

  Furthermore, since the heat insulating material is arranged on the outer surface, the construction of the heat insulating structure is simple, and there is an effect that it is convenient for repair.

These are the perspective views which decomposed | disassembled and showed a part of furnace shown as one Embodiment of this invention. These are the schematic block diagrams of the furnace shown as one Embodiment of this invention. (A), (b) is sectional drawing which shows the attachment structure of the heat insulating material of the furnace shown as one Embodiment of this invention. These are sectional drawings which show the attachment structure of the heat insulating material of the furnace shown as another embodiment of this invention. These are figures which show the attachment structure of the heat insulating material of the furnace shown as another embodiment of this invention. These are sectional drawing of the principal part which shows the conventional heat insulation structure.

Hereinafter, an embodiment of a heat insulating structure for a furnace according to the present invention will be described with reference to the drawings, taking as an example a case where the present invention is applied to a drying furnace.
FIG. 1 is an exploded perspective view showing a part of a drying furnace 20 to which the present invention is applied.
As shown in this figure, the drying furnace 20 has a configuration in which a heat insulating material 23 is arranged on the outer surface of the furnace body 22 without a substantial gap.

  The drying furnace 20 is an object to be processed 24 (FIG. 2) such as a paper container (for example, egg packaging package) formed by solidifying vegetables or the like to be processed into dried food (for example, dried shiitake mushrooms) or old paper dissolved in a liquid. It is a continuous conveyance type drying furnace used when drying.

  The furnace body 22 of the drying furnace 20 includes a side plate 25, a ceiling plate 26, and a bottom plate 27 shown in FIG. 2, and the side plate 25, the ceiling plate 26, and the bottom plate 27 are formed of steel plates. Is.

  As shown in FIG. 2, the furnace body 22 includes an inlet 28 through which the workpiece 24 is introduced, a hot air generator 29 that blows hot air into the furnace body 22, an outlet 30 of the workpiece 24, a furnace body. A circulation duct 31 that circulates the hot air flowing through the inside 22 through the hot air generator 29 and a suction duct 32 for taking in the outside air are provided, and the furnace body 22 is formed in three upper and lower stages. The belt conveyor 33 is provided so that the workpiece 24 can be conveyed in the longitudinal direction of the furnace body 22.

  Above the starting end of the uppermost belt conveyor 33a for conveying the object to be processed 24, an input port 28 for introducing the object to be processed 24 is formed protruding from the ceiling plate 26. An outlet 30 for taking out the object to be processed 24 is formed so as to protrude from the side plate 25 on the terminal end side for conveying the object to be processed 24.

  The hot air generator 29 is installed on the ceiling plate 26 of the furnace body 22, and communicates with the furnace body 22 through a blower pipe 34 that blows hot hot air generated from the hot air generator 29 into the furnace body 22. ing.

  The circulation duct 31 is provided so that one communicates with the interior of the furnace body 22 at the lower part of the furnace body 22 and the other communicates with the hot air generator 29. The formed air is reheated so that the heat can be used effectively.

  As shown in FIG. 1, a monitoring window 40 is provided on the side plate 25 of the furnace body 22 so that the state of the workpiece 24 conveyed through the furnace body 22 by the belt conveyor 33 can be seen from the side. Is provided.

  Further, the side plate 25 is provided with a door portion 42 provided with a handle 41 on the outer surface so that the processing object 24 in the middle of drying can be taken out or the inside of the furnace body 22 can be cleaned as necessary at regular intervals. It is set as the structure which has.

  A plurality of heat insulating materials 23 are attached to the outer surfaces of the furnace body 22, the hot air generator 29, and the circulation duct 31.

The heat insulating material 23 is a plate-like member, and as shown in FIG. 3A, a recess 43 is formed at a corner on the mounting surface 23 a side that contacts the furnace body 22, and is fitted into the recess 43. A thin plate-shaped magnet 44 having a possible shape is stuck and fixed by a heat-resistant double-sided tape (not shown).
Since the furnace body 22 is formed of a steel plate, the heat insulating material 23 can be attached by adsorbing the magnet 44 to the surface of the furnace body 22.

  The heat insulating material 23 is formed in the side plate 25 of the furnace body 22 by opening or notching so as to avoid the monitoring window 40 and the handle 41 shown in FIG. 1 and other portions where the circulation duct 31 shown in FIG. 1 is formed. The ceiling plate 26 and the bottom plate 27 are also attached to the plate surface while avoiding the portions provided in the furnace body 22.

  Moreover, the heat insulating material 23 is formed so that it may become an external shape along each shape so that it may be attached also to each part, such as the hot air generator 29 provided in the furnace body 22, and is provided in the attachment surface 23a side. The magnet 44 is attached to the steel plate of the drying furnace 20 so as to cover substantially the entire drying furnace 20.

The heat insulating material 23 is a member provided with a plate-shaped heat insulating core material and non-combustible paper affixed to the front and back surfaces of the heat insulating core material.
As the material of the heat insulating core material of the heat insulating material 23, it is preferable to use a phenol resin foam. Besides the phenol resin foam, polyurethane foam, extruded polystyrene foam, beaded polystyrene foam, melamine resin, urea resin, Thermosetting resin foam such as thermosetting polyimide, thermoplastic resin foam such as polyethylene, polypropylene, ethylene / vinyl acetate copolymer, polyvinyl chloride, acrylic resin, etc. can be used. For this, fiber materials such as glass wool and rock wool can be used. In addition, the thickness of the heat insulating core material is desirably 10 mm to 100 mm.

  The preferred phenolic resin type used in the present invention is a resole resin. Resole resin is phenol, cresol, xylenol, paraalkylphenol, paraphenylphenol, resorcinol and other phenolic compounds and formaldehyde, furfural, acetaldehyde and other aldehydes in catalytic amounts of sodium hydroxide, potassium hydroxide, calcium hydroxide Or a chemical reaction in the presence of an aliphatic amine such as trimethylamine or triethylamine. These chemicals may be those normally used in standard resole resin manufacture, and the invention is not limited to the chemicals described herein.

  The molar ratio of phenol to aldehyde is not particularly limited, preferably phenol: aldehyde = 1: 1 to 1: 3, more preferably 1: 1.5 to 1: 2.5, and particularly preferably 1: 1. 6 to 1: 2.1.

  The preferable weight average molecular weight of the phenol resin is 400 to 3,000, more preferably 700 to 2,000. The number average molecular weight is preferably 150 to 1,000, and more preferably 300 to 700.

  The foaming agent is not particularly limited, and fluorination such as aliphatic hydrocarbons having 1 to 8 carbon atoms, chlorinated aliphatic hydrocarbons having 1 to 8 carbon atoms, 1,1,1,3,3-pentafluorobutane, etc. Hydrocarbon compounds (alternative chlorofluorocarbons), salt fluorinated hydrocarbon compounds such as trichloromonofluoromethane and trichlorotrifluoroethane, ether compounds such as isopropyl ether, nitrogen, argon, carbon dioxide, air etc. alone or in combination of two or more Used in a mixture.

  Among the foaming agents, the resulting foam has low thermal conductivity and low potential for global warming, so it has 2 to 7 carbon aliphatic hydrocarbons and 2 to 6 carbon chlorinated aliphatics. A hydrocarbon is preferably used alone or in a mixture of two or more, and an aliphatic hydrocarbon having 3 to 6 carbon atoms such as propane, butane, pentane, hexane and dichloroethane, propyl chloride, isopropyl chloride, butyl chloride, isobutyl chloride, A mixture of two or more chlorinated aliphatic hydrocarbons having 2 to 5 carbon atoms such as pentyl chloride and isopentyl chloride is particularly preferable.

  The amount of the blowing agent is 1 to 20 parts by weight per 100 parts by weight of the phenol resin, and more preferably 3 to 10 parts by weight per 100 parts by weight of the phenol resin.

  Curing agents used to initiate the polymerization of phenolic resins include inorganic acids such as sulfuric acid and phosphoric acid, benzenesulfonic acid, ethylbenzenesulfonic acid, paratoluenesulfonic acid, xylenesulfonic acid, naphtholsulfonic acid, phenolsulfonic acid, etc. And benzenesulfonic acid, ethylbenzenesulfonic acid, paratoluenesulfonic acid, xylenesulfonic acid, naphtholsulfonic acid and phenolsulfonic acid are preferable, and paratoluenesulfonic acid and xylenesulfonic acid are particularly preferable.

  One of these curing agents may be used alone, or two or more thereof may be used in combination. The amount used depends on the type of curing agent, but is usually in the range of 5 to 25 parts by weight, preferably 7 to 22 parts by weight, more preferably 10 to 20 parts by weight per 100 parts by weight of the phenolic resin. It is.

  As the non-combustible paper for the heat insulating material 23, in addition to aluminum foil, inorganic base paper mainly composed of hydrous magnesium silicate which is a non-asbestos natural mineral, paper containing aluminum hydroxide, and the like are used. The thickness of the non-combustible paper is preferably 0.006 mm to 0.3 mm.

As a method for constructing the heat insulating structure of the drying furnace 20 described above, for example, a plurality of heat insulating materials 23 having a vertical dimension and a horizontal dimension of 910 mm × 1820 mm and a thickness dimension of 10 to 90 mm are prepared, as shown in FIG. The heat insulating material 23 is cut according to the shape of each plate surface to which the heat insulating material 23 such as the side plate 25, the ceiling plate 26, and the circulation duct 31 of the furnace body 22 can be attached. At this time, in the portion of the side plate 25 where the monitoring window 40 and the handle 41 are formed, the portion is formed with an opening or a notch.
And the attachment surface 23a provided with the magnet 44 of the heat insulating material 23 shown in FIG. 3 is brought into contact with the outer surface of the furnace body 22, and there is no gap on the outer surface of the furnace body 22 to which the heat insulating material 23 can be attached. By sticking, the heat insulation structure of the drying furnace 20 is completed.

  Thus, according to the heat insulation structure of the drying furnace 20 to which the present invention is applied, it is possible to cover the heat insulating material 23 almost entirely including the portion where heat is easily conducted from the inside of the furnace body 22, It is possible to block between the surface of the drying furnace 20 and the outside air, and it is possible to improve the thermal efficiency of the drying furnace 20.

  Moreover, since the heat insulating material 23 is arranged on the outer surface of the furnace body 22, the outer surface of the heat insulating material 23 does not become high temperature, and it is easy for an operator to perform the work with peace of mind around the drying furnace 20. An effect is obtained.

  Moreover, in order to suppress the heat | fever conducted on the outer surface of the furnace body 22 with the heat insulating material 23 and to make it discharge | release to the circumference | surroundings of the drying furnace 20, the temperature rise in the room | chamber interior which is operating the drying furnace 20 is suppressed. The working environment can be maintained well, and the cooling cost for adjusting the room temperature can be reduced.

  Furthermore, since the heat insulating material 23 is attached to the outer surface of the furnace body 22 using the magnets 44, the construction of the heat insulating structure of the drying furnace 20 is simple, and when the door portion 42 of the side plate 25 is opened and closed. Since the heat insulating material 23 can be easily removed, the entire drying furnace 20 can be covered with the heat insulating material 23 without any gap, and the heat insulating material 23 is also insulated during handling of the drying furnace 20 and repairing the heat insulating structure of the drying furnace 20. The effect that the material 23 can be easily handled is obtained. Moreover, there exists an advantage that it is suitable also for the partial repair of the heat insulation structure of the drying furnace 20. FIG.

  Moreover, since the heat insulating material 23 can be attached and detached freely and simply, the effect of reducing the time and cost for repairing the heat insulating structure of the drying furnace 20 can be obtained.

  Further, by using a plate-like phenolic resin foam as the heat insulating material 23, it is possible to obtain high heat insulating performance and improve the thermal efficiency, and to reduce the thickness of the heat insulating material 23 and to install the drying furnace 20 The effect that can be secured is obtained.

  Moreover, since the heat insulating material 23 can be reduced in weight, the carrying work of the heat insulating material 23 to the construction site and the construction work can be simplified, and the construction work can be efficiently performed. The effect that the reduction can be achieved and the effect that the fixed load of the drying furnace 20 can be reduced can be obtained.

  In the above embodiment, the heat insulating material 23 is configured to have the magnet 44 formed in a thin plate shape fitted in the recess 43, but taking into account the time of removal of the heat insulating material 23 from the drying furnace 20. As shown in FIG. 3 (b), the magnet 44 may be provided with a rod-like gripping portion 45 made of a non-combustible fiber material so that the gripping portion 45 protrudes from the outer surface of the heat insulating material 23.

  With such a configuration, it is possible to easily remove the heat insulating material 23 from the drying furnace 20 by directly pulling the magnet 44 through the gripping portion 45, and the magnet 44 can be removed from the recess 43, or around the magnet 44. It is possible to prevent the heat insulating material 23 from being damaged due to stress applied to the surface.

Further, as shown in FIG. 3B, a heat insulating material 23 fitted with a magnet 44 whose thickness is slightly thicker than the recess 43 is attached to the outer surface of the furnace body 22 or there is no recess 43. The heat insulating material 23 in which the magnet 44 is attached to the mounting surface 23a of the heat insulating material 23 is attached to the outer surface of the furnace body 22 as indicated by a two-dot chain line, and the heat insulating structure of the drying furnace 20 is provided outside the mounting surface 23a and the furnace body 22. It is good also as a structure which formed the air layer P between the surfaces.
By setting it as such a structure, a higher heat insulation effect is acquired by this air layer P and the heat insulating material 23. FIG.

In addition to the method of using the magnet 44 as described above, as a means for attaching the heat insulating material 23 to the drying furnace 20, as shown in FIG. 4, the outer surface of the furnace body 22 and the attachment surface 23 a of the heat insulating material 23 are provided. It is also possible to attach the hook-and-loop fasteners 46 and 47 with heat-resistant tape at positions facing each other.
By adopting such a sticking means, the heat insulating material 23 can be attached and detached freely and simply, and the time and cost for repairing the heat insulating structure of the drying furnace 20 can be reduced.

  Alternatively, as a means for attaching the heat insulating material 23 to the furnace body 22, as shown in FIG. 5, an attachment member that forms an engaging projection 48 as a member constituting a part of the drying furnace 20 on the outer surface of the furnace body 22. In addition, the engagement recess 50 may be formed in the heat insulating material 23 and the engagement protrusion 48 and the engagement recess 50 may be fitted to each other.

  In this case, the engaging convex portion 48 is formed of an elastically deformable synthetic resin material, and the projections 52 and 52 having the inclined surfaces 51 and 51 approaching each other toward the tip are formed on the engaging convex portion 48, and the slip is formed. A split gap 53 is formed.

In addition, the engaging recess 50 of the heat insulating material 23 is configured to have step portions 54 and 54 for engaging the protrusions 52 and 52 of the engaging protrusion 48 at the back.
And when attaching the heat insulating material 23, the wall part which has the protrusions 52 and 52 of the engaging convex part 48 is mutually elastically deformed, it inserts in the engaging recessed part 50, the said wall part is elastically returned, and the protrusion 52 , 52 are engaged with the step portions 54, 54.

  Thus, in this attachment means, the heat insulating material 23 can be firmly attached to the drying furnace 20.

Further, as another embodiment of the present invention, the heat insulating material 23 formed in a plate shape may be incorporated in a synthetic resin or metal frame and the frame may be attached to the surface of the drying furnace 20.
At this time, as means for attaching the frame body to the drying furnace 20, screwing means can be used in addition to the means shown in FIGS. 3 (a) and 3 (b).

DESCRIPTION OF SYMBOLS 20 Drying furnace 22 which applied heat insulation structure Furnace body 23 Heat insulating material 24 To-be-processed object 44 Magnet 46 Surface fastener 47 Surface fastener 48 Engagement convex part 50 Engagement recessed part

Claims (1)

A furnace in which the outer surface of the furnace body is at a temperature of 130 ° C. or lower when the workpiece is supplied and heat-treated;
A heat insulating structure for a furnace, wherein a heat insulating material is attached to the outer surface.

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