JP2005052542A - Heating/hot-preserving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive, lightweight in-flight meal hot storage cabinet having an excellent space efficiency capable of maintaining an optimum inside temperature without installing a heat-pump type heating/hot-preserving device. <P>SOLUTION: A flat heating element 10 is composed by punching out a carbon graphite sheet 11 into a predetermined shape, bonding an insulating film 12 on both side surfaces of the sheet for sealing, and bonding the resultant sheet on the back side of a heat radiation plate 15 composed of an aluminum plate. The flat heating element 10 is bonded on the inside of a wall surface of a case 35 to obtain the heating cabinet. The inside of the case 35 is heated/preserved hot by energizing the carbon graphite sheet 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heating and warming device, and more particularly to a heating and warming device that maintains an internal atmosphere temperature at a higher temperature than the outside.

  A service is provided to provide in-flight meals to airplane passengers. In-flight meals are not cooked on an airplane, but are cooked at cooking facilities attached to the airport. The cooked meal is stored in the warm storage room, and the warm storage room is carried into the airplane immediately before the departure of the airplane. Then, at an appropriate time after the flight, a crew member takes out the meal from the inside of the warm storage and distributes it to the passenger to provide a meal providing service.

  The conventional warm storage used for such a purpose is equipped with a heat pump type refrigeration cycle, takes heat from the external atmosphere by the evaporator, and releases heat into the warm storage by a condenser, thereby the internal temperature. Maintain the temperature necessary to warm the meal. Such a heat pump refrigeration cycle requires a compressor and an expansion valve for compressing a medium gas in addition to an evaporator and a condenser, which increases the weight of the storage cabinet and increases the cost.

  An object of the present invention is to provide a heating and heat retention device such as a warm warehouse having a heating means that is lightweight and low in cost without increasing in weight.

  Another object of the present invention is to provide a heating and heat retention device that maintains the interior at a higher temperature than the outside without using a heat pump refrigeration cycle.

  Another problem of the present invention is to provide a heat and heat retention device having an excellent antibacterial effect.

  Another object of the present invention is to provide a heating and warming device that can be widely applied to various heating and warming devices such as a warm warehouse, a showcase, a warmer, a dryer, and a fuller.

  The above-described problems and other problems of the present application will be clarified by the technical idea and the embodiments of the present invention described below.

The main invention of the present application is a heating and heat retention device that maintains the internal atmospheric temperature at a higher temperature than the outside.
The present invention relates to a heating and heat retention device characterized in that a planar heating element using a carbon graphite sheet is arranged along an inner wall surface.

  Here, an insulating sheet is bonded to both surfaces of the carbon graphite sheet to insulate, and bonded to the back surface of a metal heat sink, heated by Joule heat when energized to the carbon graphite sheet, It is preferable to release heat from the front surface of the heat sink to the inside of the housing. Further, the carbon graphite sheet is sandwiched between metal terminal plates bent so as to be doubled to form a terminal, and a power supply wire is connected to the terminal to energize the carbon graphite sheet. Is preferred. Further, it is preferable that the casing is formed in a rectangular parallelepiped shape, and the planar heating element is attached to the inside of at least one wall surface. Moreover, it is preferable that a photocatalyst layer is formed on the surface of the heat radiating plate of the planar heating element, which is the atmosphere in the housing. Moreover, it is preferable that it is a heat storage store | stored the cooked meal in a heat retention state. Moreover, it is preferable that it is a showcase which keeps food displayed while keeping heat.

  The main invention of the present application is that a planar heating element using a carbon graphite sheet is arranged along the inner surface of the casing. Therefore, according to such a heat insulation device, when the carbon graphite sheet is energized by the power feeding means, the carbon graphite sheet generates heat due to Joule heat. Therefore, it becomes possible to heat the inside of the housing of the heating and heat retaining device with such heat and maintain the atmospheric temperature inside the casing higher than the outside. And since it heats using Joule heat using the planar heating element which consists of a carbon graphite sheet, a heat pump refrigerating cycle is not required and a weight does not increase. Moreover, it becomes possible to configure a heating and heat retention device at a low cost. Furthermore, since the heating and heat insulation is achieved by the heat generated by the planar heating element, it is very advantageous in terms of space, and the internal space can be effectively used for the original purpose.

  1 and 2 show a warm storage according to the present embodiment. This warm storage is a warm storage used to keep the in-flight meals of airplanes. That is, a meal cooked by a cooking facility attached to the airfield is stored in a tray, and this tray is further stored in the warm storage of the present embodiment. Then, it is mounted on the airplane in the warm storage room, and the inside of the airplane is energized to keep the inside at a proper warm temperature. Then, at a predetermined time, a crew member opens this warm storage room and provides a warm meal to the passengers.

  The warm storage is provided with a rectangular parallelepiped casing 35, and a heat insulating door 37 is attached to a front opening 36 of the casing 35 through a hinge 38 so as to be opened and closed. A caster 39 is attached to the bottom of the casing 35 so that the position can be freely moved inside the airplane.

  The internal structure of the housing is particularly as shown in FIG. 2, with a heat insulating material 42 attached to both sides of the housing 35, a heat insulating material 43 on the top surface, and a heat insulating material 44 attached to the bottom. An exterior plate 45 is attached to the outer surface so as to cover the outer surface.

  In addition, support rails 47 are attached to the left and right sides of the casing 35 at a predetermined height, and the flange portions at both left and right ends of the tray 48 are supported by these support rails 47. The tray 48 stores in-flight meals for a plurality of people at the same time.

  FIG. 3 is an enlarged view of the wall structure of the housing 35 particularly at the mounting portion of the support rail 47 for supporting the tray 48. The housing 35 has an exterior plate 45 on the outside. In addition, a relatively thick heat insulating material 42 is disposed on the inner side. The planar heating element 10 is attached to the inside of the heat insulating material 42 via the heat insulating sheet 13. And the surface of this planar heating element 10 is comprised from the aluminum plate 15 which comprises a heat sink. A support rail 47 is attached inside the aluminum plate 15.

  FIG. 4 shows the structure of such a planar heating element 10. The planar heating element 10 is composed of a carbon graphite sheet 11 whose main part is punched into a predetermined bent shape, on both sides thereof. The insulating film 12 is bonded so that the peripheral edges are bonded to each other. And the planar heating element 10 is formed by joining the heat insulation sheet 13 to the back side.

  FIG. 5 shows a state in which the carbon graphite sheet 11 is exposed by removing the aluminum plate 15 of the planar heating element 10 and the insulating film 12 inside and on the front side. A plurality of carbon graphite sheets 11 punched in substantially the same shape are arranged at a predetermined interval. The support rail 47 is fixed to the inside of the housing 35 by screws that pass through the gaps between the carbon graphite sheets 11.

  Lead wires 31 are connected to both ends of these carbon graphite sheets 11 via terminal plates 30, respectively. Accordingly, when the carbon graphite sheet 11 is energized by the lead wire 31 through the terminal plate 30, the carbon graphite sheet 11 generates Joule heat, and the heat generated by the Joule heat is transmitted through the aluminum plate 15 on the front side. Heat is radiated inside the body 35.

  FIG. 6 shows a connection structure between the end portion of the carbon graphite sheet 11 and the lead wire 31. A copper plate bent in a U shape so as to be doubled is attached to the end portion of the carbon graphite sheet 11. The end of the graphite sheet 11 is clamped by elasticity. In this state, the lead wire 31 is connected to the terminal board 30 by the solder 32. And the upper and lower sides including the connection part by the terminal board 30 with such a lead wire 31 are insulated by the insulating film 12 as shown in FIG.

  Next, the carbon graphite sheet 11 constituting the planar heating element 10 will be described. 4 and 5 show a sheet heating element 10 according to this embodiment. The planar heating element 10 has a form in which an insulating film 12 is bonded to the top and bottom of a graphite sheet 11 and the carbon graphite sheet 11 is surrounded by these films 12.

  The graphite sheet 11 is formed by rolling natural graphite into a sheet shape. It is preferable that innumerable stripes are formed on the surface of the graphite sheet 11 in parallel with each other. The streaks are formed in a predetermined direction, for example, the length direction or the width direction of the planar heating element 10. This prevents the carbon graphite sheet 11 from being broken when the heating element 10 is bent.

  The upper and lower insulating films 12 surrounding the carbon graphite sheet 11 are made of a liquid crystal polymer. The liquid crystal polymer includes a lyotropic liquid crystal polymer exhibiting liquid crystallinity in a solution and a thermotropic liquid crystal polymer exhibiting liquid crystallinity in a molten state. The main chain type liquid crystal polymer that forms a rigid linear chain with a high axial ratio (ratio of molecular length to width, aspect ratio) and a side chain on the main chain of vinyl polymer, etc. There is a side chain type liquid crystal polymer in which rod-like molecules are suspended.

  Xydar and Vectra are known as liquid crystal polymers for plastics represented by poly (P-phenylene terephthalamide). These have a tensile strength comparable to that of glass-filled PEP, have excellent electrical properties, and are easily processed. Also, the melt viscosity is low and the shear rate used for processing is independent of temperature. In Vectra, a conventional injection molding machine is used, but in Xydar, the melting point is high, so the machine needs to be improved. Xydar has excellent performance at high temperatures. Since it does not absorb microwaves and has a high heat distortion temperature, Xydar is preferably used as a tableware that can be used in a microwave oven. Also, it has good electrical characteristics and small molding shrinkage, so it is suitable for application to electrical and electronic parts. It is said that several types of expensive metal parts can be replaced with one type of Vectra as packing for a distillation column that requires chemical resistance. In the present embodiment, Vectra manufactured by Polyplastics Co., Ltd. is used as the insulating film 12.

  The insulating film 12 is larger in size than the surrounding graphite sheet 11, and for this reason, the upper and lower insulating films 12 are directly joined to the periphery of the graphite sheet 11, thereby completely surrounding the graphite sheet 11. ing. Moreover, a release paper is joined to the lower surface of one insulating film 12 as needed. This is for protecting the adhesive when bonded to the surface of the object through the insulating film 12, and the release paper is peeled off when bonding.

  Thus, when the upper and lower surfaces of the graphite sheet 11 are surrounded by the insulating film 12 made of a liquid crystal polymer, the graphite sheet 11 is completely insulated, and the insulating film 12 has heat resistance. A planar heating element 10 is provided. Further, by forming an adhesive layer on the surface of the insulating film 12, it can be arbitrarily joined to a predetermined object, for example, the heat sink 15.

  The insulating film 12 surrounding the graphite sheet 11 is made of a liquid crystal polymer and does not transmit various gases, particularly oxygen and water vapor. Therefore, the surrounding graphite sheet 11 is not deteriorated and has a dimensional stability. A high planar heating element 10 is obtained. Further, since the insulating film 12 has chemical resistance, the planar heating element 10 also has chemical resistance. Moreover, since the heat-resistant film 12 has good insulating properties and is non-toxic and has flame retardancy, the planar heating element 10 having such properties can be obtained.

  Note that a cheaper general polyester film or the like can be used as the insulating film 12 in place of the liquid crystal polymer as described above. That is, when the temperature required for the storage is relatively low, the carbon graphite sheet 11 is replaced with a general-purpose film such as polyester having normal heat resistance instead of the liquid crystal polymer having high heat resistance. It may be insulated.

  7 and 8 show the structure of the heat radiating plate 15 of such a planar heating element 10. Here, the aluminum plate 15 is used as a material, and the upper and lower surfaces of the aluminum plate 15 are respectively subjected to chemical treatment. Layers 16 and 17 are formed. Then, epoxy resin layers 18 and 19 are formed on the outer surfaces of the chemical treatment layers 16 and 17. A photocatalytic layer 20 is formed on the surface of the upper epoxy resin layer 19.

  FIG. 9 shows a manufacturing process of such a heat radiating plate 15. The aluminum plate 15 is pretreated to form chemical treatment layers 16 and 17. Then, an epoxy resin layer 19 is formed on the lower surface of the lower chemical treatment layer 17 by undercoating, and this epoxy resin is baked. Further, an epoxy resin 18 is overcoated on the surface of the opposite chemical treatment layer 16 and baked. Thereafter, the photocatalyst layer 20 is applied to the surface of the upper epoxy resin layer 18 and baked.

  Here, as the thickness of the heat radiating plate 15, an aluminum plate having a thickness of about 0.5 to 5 mm may be used. A galvanized steel plate or a stainless steel plate can be used instead of the aluminum plate. The epoxy resin layers 18 and 19 are preferably applied to a thickness of about 30 to 100 μm. The thickness of the titanium oxide photocatalyst layer 20 on the outer surface is preferably in the range of 10 to 50 μm.

  FIG. 10 and FIG. 11 show another heat radiating plate 15, in which pretreatment layers 24 and 25 are formed on the upper and lower surfaces of the aluminum plate 15 by nickel treatment, respectively, and above the upper pretreatment layer 24. An undercoat layer 27 is formed on the underside of the lower pretreatment layer 25. The photocatalyst layer 20 is formed on the upper side of the upper overcoat layer 26. Here, when using a steel plate instead of the aluminum plate, a steel plate for enamel is used, and the pretreatment layers 24 and 25 are formed by nickel treatment.

  FIG. 12 shows a process for forming the photocatalyst layer 20 of the heat radiating plate 15. The pretreatment layers 24 and 25 are formed on the upper and lower surfaces of the aluminum plate 15, respectively. Layer 27 is formed and fired. Thereafter, the overcoat layer 26 is formed and fired, and the photocatalyst layer 20 is formed and fired thereon. Thereby, the heat sink 15 is obtained.

  Here, the thickness of the heat sink 15 is preferably 0.5 to 3.0 mm. Moreover, it is preferable that the film thickness of the enamel when the surface is subtracted, that is, when a steel plate is used, is 50 to 300 μm. A titanium oxide film 20 is formed on the upper surface of the upper coating layer 26. The total thickness of the titanium oxide film 20 and the overcoat layer 26 is preferably 60 to 400 μm. On the other hand, the lower enamel thickness, that is, the undercoat layer 27 may be in the range of 50 to 300 μm.

  According to such a warm storage, a plurality of in-flight meals cooked at the airfield cooking facility are stored in the tray 48 shown in FIG. 2, and a plurality of trays 48 are supported by the support rails 47 on both sides of the warm storage. Store in the steps. Then, the warm storage room storing the tray 48 is carried into the airplane while being moved by the casters 39. Then, the carbon graphite sheet 11 of the sheet heating element 10 is energized by the lead wire 31 using the power supply in the airplane. As a result, the carbon graphite sheet 11 generates heat due to Joule heat, and the heat is released into the warm storage through the aluminum plate 15. Therefore, the inside of the warm storage is maintained at an appropriate temperature. In order to manage the temperature correctly, control means such as a thermostat may be used. Therefore, such a warm storage room can provide an in-flight meal kept at an appropriate temperature at an arbitrary time.

  The greatest feature of such a warm storage is that the planar heating element 10 made of the carbon graphite sheet 11 is used. Therefore, it is not necessary to use a heat pump type heating device such as a conventional in-flight food storage cabinet, so that the weight can be reduced and the cost can be greatly reduced. Further, since the heating element is composed of the planar heating element 10 attached to the inside of the heat insulating material on the side as shown in FIG. 2, even if such a heating element 10 is provided, the contents of the warm storage are provided. The product is almost unchanged, which makes it a space-efficient storage. In addition, since the photocatalyst layer 20 is formed on the surface of the heat radiation plate 15 on the surface of the sheet heating element 10, it becomes possible to keep the inside of the warm storage chamber in an antibacterial state, and food poisoning due to in-flight meals is prevented. Can be prevented.

  Next, another embodiment will be described with reference to FIGS. In this embodiment, the structure of the sheet heating element 10 is changed, and a plurality of sheet heating elements 10 are arranged in a number of levels on the inside of the heat insulating material 42 on the side surface in the cabinet.

  As shown in FIGS. 14 and 15, here, a carbon graphite sheet 11 punched in a strip shape is used, and lead wires 31 are connected to both ends in the length direction via terminal plates 30, respectively. The connection structure of the terminal plate 30 and the lead wire 31 is the same as the structure shown in FIG. 6 of the above embodiment. Such a carbon graphite sheet 11 is sandwiched and insulated by upper and lower insulating films 12 and joined to the back surface of a heat radiating plate 15 made of an aluminum plate.

  As shown in FIG. 13, such a planar heating element 10 is separately attached to a portion between the support rails 47 inside the heat insulating material 42 constituting the side walls on both sides of the warm storage. . Therefore, according to such a configuration, it is possible to provide a warm storage by preparing a large number of planar heating elements 10 as a unit and arbitrarily attaching the planar heating elements 10 according to the application. . Further, when a failure occurs in a part of these planar heating elements 10, only the defective planar heating element 10 needs to be replaced, and it becomes unnecessary to replace the entire planar heating element 10.

  Next, still another embodiment will be described with reference to FIGS. In this embodiment, a warm storage type showcase 51 is applied to the present invention. The showcase 51 includes a housing whose front surface is an opening 52, and a shelf board 53 is detachably attached in a plurality of stages. As shown in FIG. 17, the showcase 51 is provided with heat insulating materials 54 on the back surface, top surface, and bottom surface, respectively, and the outside is covered with an exterior plate 55. Also here, a small planar heating element 10 as shown in FIGS. 14 and 15 is attached to a required portion inside the wall surface of the showcase 51.

  Therefore, according to such a showcase, the inside of the showcase 51 can be heated and maintained in a heat retaining state by the heat generated by the planar heating element 10 without providing a heat pump type heating means. . Therefore, a lightweight and low-cost heat and heat retention type showcase is provided. Also here, by forming the photocatalyst layer 20 on the surface of the heat dissipation plate 15 on the surface side of the planar heating element 10, bacteria are less likely to be generated inside the showcase 51, and the articles sold by the showcase 51 Bacteria spoilage will be prevented.

  In addition, the heating and warming device according to the present invention is not limited to the above-described in-flight meal storage cabinet or warm-type showcase, and can be applied to various other types of heating and warming devices. It can be applied to an incubator, a dryer, a fuller, etc. Furthermore, the present invention can be applied to a transport box (Okamochi) used for transporting a cooked meal by a restaurant, a pizza delivery case, a fast food transport container in a fast food restaurant, or a steam towel warmer. Furthermore, it can also be used as a heat-retaining device for a box-type home sauna.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, the punched shape of the carbon graphite sheet 11 constituting the main part of the planar heating element 10 and the connection structure with the lead wire 31 can be appropriately changed depending on the purpose and space of the equipment to be applied.

  The invention of the present application can be widely applied to an in-flight food storage cabinet, a food showcase for sale in a warm state, and the like.

It is an external appearance perspective view of the warm storage for an in-flight meal of an airplane.

It is a longitudinal cross-sectional view of the same temperature storage.

It is an expanded longitudinal cross-sectional view which shows the wall surface structure of the same temperature storage.

It is a disassembled perspective view which shows the structure of a planar heating element.

It is a front view of the state which exposed the part of the carbon graphite sheet of the same planar heating element.

It is an expanded sectional view which shows the connection structure of the lead wire with respect to a carbon graphite sheet.

It is an expanded sectional view of a heat sink.

It is an external appearance perspective view which shows the structure of the photocatalyst layer of a heat sink.

It is a perspective view which shows the process of forming a photocatalyst layer on a heat sink.

It is a principal part expanded sectional view of the heat sink of another structure.

It is the principal part expansion perspective view which fractured | ruptured a part of the same heat sink.

It is process drawing which shows formation of the photocatalyst layer on the same heat sink.

It is sectional drawing of the warm storage warehouse for in-machine weaving of another embodiment.

It is a disassembled perspective view of the planar heating element in the same warehouse.

It is a front view of the state which exposed the carbon graphite sheet of the same planar heating element.

It is an external appearance perspective view of a warm storage type showcase.

It is a longitudinal cross-sectional view of the showcase.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Planar heating element 11 Carbon graphite sheet 12 Insulating film 13 Heat insulating sheet 15 Aluminum plate (heat sink)
16, 17 Chemical treatment layer 18, 19 Epoxy resin layer 20 Photocatalyst layer 24 Pretreatment layer (top)
25 Pretreatment layer (bottom)
26 Upper coating layer 27 Lower coating layer 30 Terminal board 31 Lead wire 32 Solder 35 Housing 36 Front side opening 37 Door 38 Hinge 39 Caster 42 Heat insulating material (side surface)
43 Insulation (top)
44 Insulation (bottom)
45 exterior plate 47 support rail 48 tray 51 showcase 52 opening 53 shelf plate 54 heat insulating material 55 exterior plate

Claims (7)

In a heating and thermal insulation device that maintains the internal ambient temperature at a higher temperature than the outside,
A heating and heat insulation device characterized in that a planar heating element using a carbon graphite sheet is arranged along an inner wall surface.   Insulating the carbon graphite sheet by bonding an insulating sheet to both surfaces of the carbon graphite sheet, bonding the insulating sheet to the back surface of a metal heat sink, and heating the carbon graphite sheet with Joule heat when energized, the heat sink The heat and heat retention device according to claim 1, wherein heat is released from the front surface to the inside of the housing.   The end of the carbon graphite sheet is sandwiched between metal terminal plates bent so as to be doubled to form a terminal, and a power supply wire is connected to the terminal to energize the carbon graphite sheet. The heating and heat-retaining device according to claim 1 or 2, characterized by the above.   The heating and heat retention device according to claim 1 or 2, wherein the heating and heat insulation device is configured by a casing having a rectangular parallelepiped shape, and the planar heating element is attached to the inside of at least one wall surface thereof.   The heat and heat retention device according to claim 4, wherein a photocatalyst layer is formed on a surface of the heat radiating plate of the planar heating element, which is formed in an atmosphere in the housing.   The heating and heat insulation device according to claim 1, 2, 4, or 5, which is a warm storage for storing cooked meals in a heat insulation state. 6. The heat and heat retention apparatus according to claim 1, wherein the food and heat display is a showcase that keeps food while keeping warm.

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