JP2011089648A - Long body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long body capable of removing gas molecules absorbed into a constituent material by heating and being an object to be baked. <P>SOLUTION: This long body has a space requiring evacuation and is the object to be baked. This long body has current carrying performance for heating by carrying current, and a section between adjacent turns of the long body is insulated while it is wound around an object for winding. A baking device for baking this long body has a heat insulating wall (a heat insulating vessel 10) surrounding the long body (a heat insulating pipe 100) having the space. The heat insulating wall has an electric power supply passage insertion part and an exhaust air passage insertion part. The electric power supply passage insertion part lets an electric power supply passage (an electrical wire 32) for heating the object by carrying current pass through the inside and the outside of a region surrounded by the heat insulating wall. The exhaust air passage insertion part lets an exhaust air passage (an exhaust pipe 42) for evacuating the space in the object pass through the inside and the outside of the region surrounded by the heat insulating wall. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elongated body that is an object to be baked to remove gas molecules or the like stored in a constituent material by heating. In particular, the present invention relates to a wound long body.

  In a vacuum double insulation tube where a vacuum layer is formed between the inner tube and the outer tube, in order to improve the degree of vacuum by removing gas molecules occluded in the constituent material of this insulation tube, the insulation tube A heat treatment called baking is performed.

  This baking is roughly classified into two methods. One is a method of storing an object in a heat insulating container and heating the object using a heater (for example, Patent Document 1), and the other is a heat treatment using the heating object itself as a heating element. It is a method (for example, patent document 2).

Japanese Patent Laid-Open No. 10-64488 JP 2004-353681 A

  However, the above baking method has a problem that it is difficult to uniformly heat a long body wound around a drum.

  In the method described in Patent Document 1, temperature distribution occurs at a location close to the heater and a location away from the heater. Even if the heater is attached to the long body, it is practically impossible to attach the heater uniformly over the entire length and the entire circumference of the long body wound around the drum.

  On the other hand, even with the method described in Patent Document 2, a temperature distribution is generated on the side closer to the drum winding drum and on the side farther from the long body. When the long body is wound around the drum, when the longitudinal section of the drum is viewed, the long bodies are stacked in the radial direction. The drum generally has a large heat capacity, and the temperature rise of the drum drum is slow at the early stage of heat generation of the long body. However, once the temperature of the drum drum becomes stable, the fluctuation in temperature decreases. Therefore, when the temperature of the drum is stabilized, the long body adjacent to the winding drum hardly changes in temperature.

  Moreover, since the long body located on the drum inner peripheral side is wound with a long body of another turn on the outer periphery, the heat of the generated long body is difficult to dissipate to the outer peripheral side of the drum. In particular, when the long body is a double heat insulating tube, there is a space between the inner tube and the outer tube, so when the double heat insulating tube is laminated in the radial direction of the drum, the inner peripheral side and outer periphery of the drum Heat transfer between the long bodies positioned on the side is very small, and this is also a factor that causes a small temperature fluctuation of the long bodies positioned on the inner peripheral side of the drum.

  On the other hand, since the long body located on the outer peripheral side of the drum is in direct contact with the outside air, the heat generated by the long body is easily dissipated to the outside air and is also easily cooled by the convection of the outside air.

  As a result, for example, when the side close to the winding drum of the long body is about 70 ° C., the far side becomes about 40 ° C., and uniform heating cannot be performed over the entire long body.

  The present invention has been made in view of the above circumstances, and a main object thereof is to provide a long object that is an object to be baked and can be uniformly heated during baking.

  The long body of the present invention has a space to be evacuated and relates to a long body that is an object to be baked. The long body has conductivity that can be energized and heated, and the adjacent turns of the long body are insulated in a wound state wound around the wound object. This long body can be uniformly heated by a baking apparatus and method to be described later.

  The elongate body of the present invention can be baked by the following baking apparatus. This baking apparatus is a baking apparatus provided with a heat insulating wall surrounding an object having a space. This heat insulation wall has an electric power supply path insertion part and an exhaust path insertion part. The power supply path insertion section passes the power supply path for energizing and heating the object through the inside and outside of the region surrounded by the heat insulating wall. The exhaust path insertion portion passes the exhaust path for evacuating the space of the object through the inside and outside of the region surrounded by the heat insulating wall.

  According to this apparatus, the heat dissipation of the heated target object is effectively suppressed by surrounding the target object with the heat insulating wall. In addition, this apparatus can perform heating using the object itself as a heating element by configuring the apparatus so that the object can be energized and heated. Therefore, the object can be heated uniformly by suppressing the heat radiation and heating the object itself by heat generation.

  What is necessary is just to comprise the heat insulation wall in this apparatus with the heat insulating material which has the appropriate heat insulation according to the heating temperature of the target object. Typically, a plate material in which inorganic fibers such as glass wool, rock wool, and ceramic wool are compression-molded to a predetermined density using an organic binder such as phenol resin or an inorganic binder such as colloidal silica can be suitably used.

  This heat insulating wall surrounds the object and forms its storage area. The size and shape of this region are not particularly limited. What is necessary is just to select suitably according to the magnitude | size and shape of a target object. Normally, a rectangular parallelepiped or a cube is easily used for this shape. Of course, other cylindrical or spherical shapes may be used.

  The heat insulating wall is provided with a power supply path insertion portion. The power supply path is for supplying power to the object in order to energize and heat the object, and an electric wire is usually used. Of course, this electric wire has a structure capable of withstanding heating during baking. The power supply path insertion portion is, for example, an insertion portion of the electric wire provided on the heat insulating wall. The power supply path insertion portion has a hole formed in the heat insulating wall and through which the power supply path passes into and out of the heat insulating wall, but the hole and the power supply path should be kept airtight for heat insulating characteristics. preferable.

  The heat insulating wall is also provided with an exhaust passage insertion portion. The exhaust path is for evacuating the space formed in the object, and an exhaust pipe is usually used. This exhaust pipe is also configured to withstand the heating during baking. The exhaust path insertion portion is, for example, an insertion location of the exhaust pipe provided on the heat insulating wall. The exhaust path insertion portion has a hole formed in the heat insulating wall and through which the exhaust path passes into and out of the heat insulating wall, and it is preferable that the hole and the exhaust path be airtight in view of heat insulating characteristics.

  This baking apparatus preferably has an airflow generation means. The air flow generating means has a function of generating an air flow in the atmosphere in the region surrounded by the heat insulating wall. By generating an air flow in the region surrounded by the heat insulating wall, heat transfer can be promoted between the high temperature portion and the low temperature portion in the region, and variation in temperature distribution around the object can be reduced. . A specific example of the airflow generation means is a fan that injects an atmosphere by rotation.

  The number of the airflow generating means may be one or plural. By using a plurality of airflow generation devices, the atmosphere can flow to every corner in the object storage area, and the direction of the airflow can be easily controlled.

  The airflow generated by the airflow generation means may be any of rectification, turbulence, circulation airflow, and the like. In particular, this airflow is preferably a circulating airflow. By setting it as a circulating airflow, the dispersion | variation in the temperature distribution in the storage area | region of a target object can be suppressed more effectively. In order to generate a circulating air flow, when the storage area of the object is a rectangular parallelepiped or a cube, an air flow generating means is provided on one upper part of the opposing heat insulating wall, and an air flow generating means is provided on the other lower part to face each other. It is preferable to inject an air flow toward the heat insulating wall.

  Moreover, it is desirable that this apparatus has a heating means. The heating means has a function of adjusting the atmospheric temperature in the region surrounded by the heat insulating wall. By adjusting the atmospheric temperature in this region with the heating means, it is possible to prevent the occurrence of a low temperature around the object and contribute to heating the object more uniformly. For example, the heater may be arranged in a region surrounded by a heat insulating wall.

  The airflow generation means and the heating means described above may be configured independently of each other or may be configured integrally. As a specific example of the integrated configuration, it is possible to provide a warm air generating means. With this hot air generating means, an air flow can be generated in the region surrounded by the heat insulating wall by the hot air, and the atmospheric temperature in this region can be adjusted by heating.

  Furthermore, in this apparatus, it is desirable that a part of the heat insulating wall is configured to be openable and closable. By making a part of the heat insulating wall openable and closable, the object can be easily put in and out of the storage area of the object surrounded by the heat insulating wall. For example, when the storage area of the object is a rectangular parallelepiped shape or a cubic shape, among the six heat insulating walls, one heat insulating wall itself is configured to be detachable from other heat insulating walls, thereby opening the storage area. Can be formed. In addition, a door that opens and closes may be provided in a part of the heat insulating wall on one side, and the object may be put into and out of the storage area by opening the door.

  Next, the elongate body of the present invention can be baked by the following baking method. In this baking method, an object having a space is surrounded by a heat insulating wall, the object is energized and heated, and the space of the object is evacuated.

  According to this method, by surrounding the target object with a heat insulating wall, the heat dissipation of the heated target object is effectively suppressed, and further, the target object is heated by energization, thereby achieving uniform heating with the target object itself as a heating element. enable.

  Also in this method, it is performed by combining at least one of (1) generating an air flow in the atmosphere in the region surrounded by the heat insulating wall and (2) heating the atmosphere in the region surrounded by the heat insulating wall. It is the same as that described in the above apparatus that is preferable.

  The elongate body of the present invention is an electrically conductive material that can be energized and heated, and a typical example is a heat-insulated container or a heat-insulated tube having a space to be evacuated. More specifically, the above method is effectively used for uniform baking over the entire length and the entire circumference of a wound long body, particularly a long body wound around a wound object such as a drum. it can. In particular, the uniform heating by the above method is effective when the heat capacity of the wound object is large and the temperature distribution is likely to occur between the inner circumference side and the outer circumference side of the elongated body in the wound state. . Specific examples of long bodies include superconducting cables, cold water pipes, water supply pipes, LNG pipes, refrigerant pipes, hot water pipes, hot water pipes, heat transfer pipes, etc. Tube.

  When a wound long body is used as an object to be baked, it is preferable to insulate adjacent turns of the long body. When baking a long body such as a heat insulating tube of a superconducting cable by the above method, it is possible to suppress a short circuit between turns at the time of energization heating by insulating each turn. This “between turns” includes not only turns adjacent in the axial direction but also turns adjacent to each other in the radial direction when long bodies are wound around the drum. This insulation can be realized by winding the outer periphery of the long body with an insulating tape. Specific examples of the insulating tape include glass tape.

  According to the elongate body of the present invention, since the elongate body is in a wound state, the elongate body can be easily accommodated in the region surrounded by the heat insulating wall in the baking apparatus. In addition, since the long body can be reduced in size, the size of the region can also be reduced. Furthermore, since the present invention long body is insulated between adjacent turns, the long body can be energized and heated, and during baking, the short body between the turns is suppressed and the long body is uniformly formed. Can be heated.

According to the apparatus and method for baking the long body, the following effects can be obtained.
(1) Surrounding the object with a heat insulating wall effectively suppresses heat dissipation of the heated object. In addition, it is possible to perform heating using the target object itself as a heating element by configuring the target object so that it can be electrically heated. Therefore, by suppressing the heat dissipation and heating the object itself by heat generation, the object can be heated uniformly and gas molecules occluded in the object can be effectively removed.

  (2) By generating an air flow in the region surrounded by the heat insulating material, heat transfer is promoted between the high-temperature part and the low-temperature part in the region, and variation in temperature distribution around the object is reduced. be able to.

  (3) By heating the ambient temperature in the region surrounded by the heat insulating wall, it is possible to prevent the occurrence of a low temperature around the object and to heat the object more uniformly.

  (4) By making a part of the heat insulating wall openable and closable, the object can be easily put in and out of the storage area of the object surrounded by the heat insulating wall.

  (5) When a wound long body is an object to be baked, a short circuit between turns during energization heating can be suppressed by insulating between adjacent turns of the long body.

It is a schematic perspective view which shows the structure of the baking apparatus which heats this invention elongate body. It is a front side schematic schematic diagram of the baking apparatus which heats this invention elongate body. It is a side surface schematic diagram of the baking apparatus which heats this invention elongate body. It is a schematic diagram which shows schematic structure of a heat insulation pipe | tube.

Embodiments of the present invention will be described below.
Here, the following description is given by taking as an example the case of baking a heat insulating tube of a superconducting cable. FIG. 1 is a schematic perspective view showing the configuration of a baking apparatus for heating the elongated body of the present invention, FIG. 2 is a schematic front view of the apparatus, and FIG. 3 is a schematic schematic side view of the apparatus.

  As shown in FIG. 1, this apparatus energizes and heats a heat insulating container 10 surrounded by a heat insulating wall, hot air generating means 20 disposed in the heat insulating container 10, and an object disposed in the heat insulating container 10. The heating means 30 for conducting the heat and the exhaust means 40 for evacuating the space of the heat insulating pipe are provided.

  The heat insulating container 10 is formed in a rectangular parallelepiped shape by combining a heat insulating plate obtained by compression-molding glass wool with a phenol resin to a predetermined density with a steel frame material. Here, as shown in FIGS. 2 and 3, one side surface 11 (FIG. 3) of the heat insulating container 10 is configured to be removable, and the heat insulating container 10 is opened by removing the side surface 11, and heat insulation is performed from the opening. The tube 100 is configured to be taken in and out. The removable heat insulating wall is configured such that when the opening of the heat insulating container 10 is closed, a gap with other heat insulating walls is eliminated and the air insulating state can be maintained.

  The hot air generating means 20 has a heater that heats the atmosphere in the heat insulating container 10 and a fan that blows air to the heater and injects hot air. In this example, a pair of hot air generating means 20 are arranged at intervals in the lower part of the front surface of the heat insulating container 10 and the upper part of the back surface. That is, the warm air generating means 21 in the lower front part circulates in the heat insulating container 10 by injecting warm air toward the back side, and the hot air generating means 22 in the upper part of the back surface injects warm air toward the front side. Create an air flow. This circulating airflow effectively moves the atmosphere in the heat insulating container 10 to suppress variations in temperature distribution, and by making the airflow warm air, the heat radiation from the surroundings of the heat insulating pipe 100 causes the surface of the heat insulating pipe 100 to move. It suppresses that part temperature falls. The hot air generating means 20 is supplied with electric power from outside the heat insulating container 10 via a power cord (not shown).

  1, the energization heating means 30 includes a power source 31 and an electric wire (power supply path) 32, and the electric wire 32 is led into the heat insulating container 10 through the heat insulating wall. ing. The insertion place of the electric wire 32 in the heat insulating wall forms an airtight electric wire insertion portion (electric power supply path insertion portion). An end portion of the electric wire 32 is connected to a heat insulating tube 100 to be described later, and power is supplied from the power source 31 to heat the heat insulating tube 100 with current.

  Further, the heat insulating container 10 is provided with an exhaust means 40. The exhaust means 40 includes a vacuum pump 41 and an exhaust pipe 42 connected to the pump 41 and introduced into the heat insulating container 10. An insertion portion of the exhaust pipe 42 in the heat insulating wall forms an exhaust pipe insertion portion (exhaust path insertion portion) having airtightness. The exhaust pipe 42 is connected to an exhaust port of a heat insulation pipe 100 described later, and is used for exhausting a space formed between inner and outer pipes of the heat insulation pipe 100 described later.

  On the other hand, the heat insulating tube 100 is housed in the heat insulating container 10 while being wound around the drum 200. As shown in FIG. 4, the heat insulation pipe 100 has a double pipe structure in which a super insulation (trade name) is disposed between an inner pipe 110 and an outer pipe 120 made of a stainless corrugated pipe. The space between them is later evacuated.

  Both ends of the heat insulating tube 100 are sealed with insulating flanges 130. The insulating flange 130 is an annular member that seals the inner tube 110 and the outer tube 120 in an insulated state, and has an inner peripheral portion and an outer peripheral portion made of metal, and an intermediate portion made of an insulating material.

  Further, an exhaust port 140 projects from the outside of the outer tube. The exhaust port 140 is connected to the exhaust pipe 42 (FIG. 1) when exhausting the space formed between the inner and outer pipes of the heat insulating pipe 100.

  Furthermore, in this example, a glass tape (not shown) is wound around the outside of the heat insulating tube 100, that is, around the outer tube 120, and the turns of the heat insulating tube 100 wound around the drum 200 are insulated.

  When baking is performed using the above apparatus, first, one side (side surface 11) of the heat insulating wall constituting the heat insulating container 10 is removed and opened, and the heat insulating tube 100 wound around the drum 200 from the opening is placed in the heat insulating container 10. Store.

  At that time, both ends of the heat insulating tube 100, that is, the inner tube 110 and the outer tube 120 can be energized by connecting the end of the electric wire 32 to the insulating flange 130 so that power can be supplied from the power source 31 to the heat insulating tube 100. To do. In addition, the exhaust pipe 42 is connected to the exhaust port 140 of the heat insulation pipe 100 so that the space formed between the inner and outer pipes 110 and 120 can be evacuated by the vacuum pump 41.

  The heat insulating wall removed in that state is closed to seal the heat insulating container 10.

  Next, the heat insulating tube 100 is energized and heated by supplying power from the power supply 31, and a hot air circulating air flow is formed in the heat insulating container 10 using the hot air generating means 20.

  When the heat insulating tube 100 reaches a predetermined temperature, the vacuum pump 41 is driven, and the space formed between the inner and outer tubes 110 and 120 in the heat insulating tube 100 is evacuated.

  As described above, the long body of the present invention can suppress a short circuit between turns during energization heating by insulating adjacent turns of the wound long body. According to the baking apparatus and method for heating the elongated body of the present invention, the heat radiation of the heated heat insulating tube can be effectively suppressed by surrounding the heat insulating tube wound around the drum with the heat insulating wall. In addition, it is possible to perform uniform heating using the target object itself as a heating element by configuring the target object to be energized and heated.

  The elongate body of the present invention can be suitably used for baking for removing gas molecules adsorbed on a constituent material.

10 Insulated container 11 Side
20 (21, 22) Hot air generation means
30 Current heating means 31 Power supply 32 Electric wire
40 Exhaust means 41 Vacuum pump 42 Exhaust pipe
100 Insulated pipe 110 Inner pipe 120 Outer pipe 130 Insulating flange 140 Exhaust port
200 drums

Claims (5)

It has a space to be evacuated and is a long body that is an object of baking,
The long body has electrical conductivity that can be energized and heated, and is in a wound state wound around a wound object, and is insulated between adjacent turns of the long body. .   2. The long body according to claim 1, wherein the interval between the turns includes an interval between adjacent turns in the axial direction of the wound object.   3. The elongated body according to claim 1, wherein the space between the turns includes a space between adjacent turns stacked in a radial direction of the wound object.   4. The long body according to claim 1, wherein the insulation is performed by an insulating tape wound around an outer periphery of the long body.   5. The long body according to claim 4, wherein the insulating tape is a glass tape.

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