JP2013168235A - Heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power loss by improving heating efficiency in outer surface heating.SOLUTION: A heating device includes: a metal plate 11 which is wound in a circumferential direction of an outer peripheral surface 8A so as to cover a heating region of a heating object 8 having an axis and to come into contact with the outer peripheral surface and is made of copper or the like; and heating wires 13 which are laid at substantially equal intervals in a circumferential direction R of the heating object 8 along a surface of the metal plate so as to come into contact with the metal plate.

Description

  The present invention relates to a heating device, and more particularly, to a technique suitable for use in heating piping of a power plant, a container imitating its environment, and the like.

  The nuclear power plant environment has a harsh environment of high temperature and high pressure, such as maintaining several hundred degrees Celsius and several tens of MPa for tens of thousands of hours. A high-temperature and high-pressure test may be performed using containers. In such an environment, a simple externally wound heater is often used to heat pipes and pressure vessels.

This is a method in which a heating wire is wound around the outer circumference of a pipe or container, and the outside is covered with a heat insulating material called a heat conductive cement (heat transfer cement) for heating. It is.
Although the usage environment is different, Patent Document 1 illustrates an example in which a good heat conductive cement (heat transfer cement) is used as a heater.

Japanese Utility Model Publication No. 01-132087

However, with such a structure, the heating wire only comes into contact with the surface of the container to be heated, and in addition, the heat-conductive cement has higher electrical conductivity than the normal cement, but compared to metals, etc. Because of its low efficiency, there was a problem of a large loss of heat transfer coefficient.
In addition, the cement is inevitably deteriorated over time, and it is necessary to replace the cement within several years if the harsh conditions such as maintaining the several hundred degrees Celsius as described above are maintained for tens of thousands of hours. This is due to floating of cement and piping or the container surface due to aging. In addition, such a coating with cement requires that the cement be destroyed and removed at the time of replacement, and there is a problem that replacement of the heater requires a lot of labor and cost.

The present invention has been made in view of the above circumstances, and intends to achieve the following object.
1. To improve heating efficiency in external heating and reduce power loss.
2. Capability to maintain performance even under harsh conditions such as high temperature and pressure.
3. Improve workability during replacement and installation.
4). To be applicable to various pipe diameters and pipe cross-sectional shapes.

The heating device of the present invention includes a metal plate wound around the circumferential direction of the outer peripheral surface so as to contact the outer peripheral surface of the shafted heating target,
A heating wire laid along the surface of the metal plate so as to contact the metal plate;
It is characterized by providing.
In the present invention, the metal plate has a groove formed on the surface thereof,
More preferably, the heating wire is laid along the groove so that at least a part thereof is disposed in the groove.
Further, in the present invention, a plurality of the grooves are arranged in the circumferential direction of the outer peripheral surface, and a fixing plate for fixing the heating wire is provided in an axial direction intersecting the groove, or the groove is the A plurality of means arranged in parallel in the axial direction of the outer peripheral surface and provided with a fixing plate for fixing the heating wire in the circumferential direction intersecting with the groove may be employed.
In the present invention, a tightening tool for tightening and winding the metal plate can be provided.

  The heating device of the present invention is provided along a surface of the metal plate so as to be in contact with the metal plate and a metal plate that is wound over the circumferential direction of the outer peripheral surface so as to be in contact with the outer peripheral surface of a shafted heating target. Since the heating wire can be transferred from the heating wire to the object to be heated through the metal plate having a high thermal conductivity without using a cement having a low thermal conductivity, Loss can be suppressed and heating efficiency can be improved. At the same time, only by correcting the winding state of the metal plate, it is possible to avoid the floating that occurs on the surface to be heated and the metal plate and to prevent the thermal conductivity from being lowered. Specifically, it is conceivable to correct the contact state between the metal plate and the object to be heated so as to obtain a preferable surface contact. In addition, the heating device of the present invention makes it easy to attach and detach the heating device to and from the heating target, thereby reducing the working time and cost.

  In the present invention, the axis is a longitudinal direction in which there is an axis that is a symmetric axis or a direction that is continuous so as to be orthogonal to the circumferential direction along the outer circumferential surface around which the heating device is wound. For example, when the object to be heated is a pipe or the like, the internal flux direction and the axis are substantially coincident with each other.

  In the present invention, the metal plate has a groove formed on the surface thereof, and the heating wire is laid along the groove so that at least part of the heating wire is disposed in the groove. Compared to a state where the object to be heated is only in contact with a single wire, the object to be heated that contacts the surface of the metal plate can be heated from the inner surface of the groove through the inside of the metal plate, thereby suppressing heat loss. Heating efficiency can be improved. Moreover, by laying the heating wire inside the groove, it can be used as a means for regulating the arrangement position of the heating wire on the surface of the metal plate.

Further, in the present invention, a plurality of the grooves are arranged in the circumferential direction of the outer peripheral surface, and a fixing plate for fixing the heating wire is provided in an axial direction intersecting the grooves, or the grooves are By adopting means that is provided in parallel in the axial direction of the outer peripheral surface, and is provided with a fixing plate for fixing the heating wire in the circumferential direction intersecting the groove, the heating wire corresponds to the connected power capacity. It is possible to control the heating state by adjusting the power applied to.
Furthermore, it is preferable that the heating wires are arranged so as not to straddle the end portions of the metal plates wound around the heating object, which are positioned opposite to each other. In this way, when the heating wire is arranged so as not to straddle the connection end of the metal plate, and the heating wire fixed by the fixing plate and the metal plate are integrally wound around the object to be heated, the heating wire is It is possible to correct or reattach the attachment state of the metal plate without removing it and improve workability.

  In addition, by making the fixing plate attachable like a belt, it can provide a good heat transfer state due to surface contact, corresponding to the outer shape (outer diameter) of the object to be heated, such as various pipes and containers. It is possible to easily fix the heating wire while maintaining it.

  Further, when the grooves are provided in the axial direction, both ends of the heating wires arranged in the respective grooves extending in the axial direction are connected to the power source, or the heating wires arranged in adjacent substantially parallel grooves. It is also possible to connect one end of each of the heating wires and connect the other heating wires to the other heating wires so that the heating wires laid in the plurality of grooves can be energized at once.

  In addition, when the grooves are provided in the circumferential direction, they are wound in the circumferential direction so as to have a substantially equal pitch in the axial direction of the object to be heated so as to be spiral, or in a parallel state with a substantially equal pitch in the axial direction. Connect both ends of the heating wire arranged in each installed groove to the power supply, or arrange in the adjacent grooves in the axial direction near the ends of the metal plates wound around the heating object And connecting the other ends of the heating wires disposed in the grooves located on both outer sides of the grooves at the other end opposite to the one end of the heating wires. It is also possible to energize a single heating wire at a time.

  The present invention provides a tightening tool for tightening and winding the metal plate, thereby changing the tightening state, such as tightening so as to shorten the interval between the opposite ends of the wound metal plate. Thus, it is possible to remove the float generated on the surface to be heated and the metal plate and to bring them into close contact with each other.

  According to the present invention, heat transfer by efficient surface contact that does not depend on the container shape is possible, power loss is reduced by high thermal conductivity, and application to various tube diameters is enabled, and heating efficiency in outer surface heating is improved. To reduce power loss, maintain performance even in harsh conditions such as high temperature and high pressure, improve workability during replacement and installation, and apply to various pipe diameters and cross-sectional shapes The effect of making it possible can be achieved.

It is a perspective view which shows 1st Embodiment of the heating apparatus which concerns on this invention. (A) is sectional drawing which shows the cross section of the groove | channel in FIG. 1, (b)-(d) is sectional drawing which shows the modification of groove shape. It is a schematic diagram which shows an example of the arrangement | positioning state of the heating wire in FIG. It is a schematic diagram which shows the other example of the arrangement | positioning state of the heating wire in FIG. It is the top view (a) and front view (b) which show 2nd Embodiment of the heating apparatus which concerns on this invention. It is a perspective view which shows 3rd Embodiment of the heating apparatus which concerns on this invention. It is a schematic diagram which shows an example of the arrangement | positioning state of the heating wire in FIG. It is a schematic diagram which shows the other example of the arrangement | positioning state of the heating wire in FIG. It is a partial exploded perspective view which shows 4th Embodiment of the heating apparatus which concerns on this invention. It is a schematic diagram which shows an example of the arrangement | positioning state of the heating wire in FIG. It is an expanded sectional view showing an example of a fastening implement concerning the present invention.

Hereinafter, a heating device according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a mounting state of a heating device in the present embodiment, FIG. 2 is a sectional view showing a cross section of a groove in the present embodiment, and FIG. 3 is an example of an arrangement state of heating wires in the present embodiment. In the figure, reference numeral 10 denotes a heating device.

  The heating apparatus 10 of the present embodiment is used when external surface heating is performed on a pressure vessel that maintains a high-temperature and high-pressure state in order to perform various tests in a nuclear power plant simulation environment. As shown in FIG. In a plurality of grooves 12 formed on the surface of the metal plate 11 and the metal plate 11 wound around the circumferential direction of the outer peripheral surface 8A so as to be in surface contact with the outer peripheral surface 8A of the heating target 8 to be a container or a pipe At least a part of the heating wire 13 disposed, a fixing plate 14 for fixing the heating wire 13 by being provided in the circumferential direction R intersecting with the groove 12, and a fastening tool 15 for tightening and winding the metal plate 11 It is supposed to have.

The metal plate 11 is made of copper having a thermal conductivity of about 300 to 400 W / (m · K), and is wound so as to cover the heating region of the heating object 8. The end portions 11A and the end portions 11B that are to be fixed are fixed with some space therebetween, and can be further tightened by the tightening tool 15 described later.
A plurality of linear grooves 12 are provided on the surface of the metal plate 11 in parallel with the axial direction X so as to be substantially equidistant in the circumferential direction R of the heating object 8.

As shown in FIG. 2, the groove 12 has a cross-sectional shape, and is composed of an arc having a curvature substantially equal to the radius of the heating wire 13 (b), a cross-sectional triangle (c) composed of two inclined surfaces, A rectangular cross section (d) that can substantially accommodate the heating wire 13 can be exemplified.
As described above, when the shape of the groove 12 is a curved surface as shown in FIG. 2B, the contact area of the heating wire 13 having a circular cross section can be maximized.
When the shape of the groove 12 is triangular as shown in FIG. 2C, the groove shape can be formed by simple processing, and even when the position of the heating wire 13 is shifted, two points are shown in the figure. Since the state in which the heating wire 13 is in contact with the groove does not change, the heating state can be prevented from fluctuating.
When the shape of the groove 12 is a groove 12 having a rectangular cross section as shown in FIG. 2 (d), heat generated from the heating wire 13 can be efficiently transmitted to the metal plate 11.
The heating wire mounting groove shape may be a groove cross-sectional shape (not shown) other than a cross-sectional arc, a triangular cross-section, and a rectangular cross-section.

  As shown in FIG. 3, each heating wire 13 is disposed in each of the plurality of grooves 12 provided in the axial direction X, and both ends thereof are connected to a power source (not shown), The power supplied to the heating wire 13 can be controlled. FIG. 3 shows the arrangement of the heating wires 13 when the metal plate 11 wound in the circumferential direction R in FIG. 1 is unfolded. The white circles indicate the end portions, and the power source (not shown) Indicates that connection is possible.

  As shown in FIGS. 1 and 2, the fixing plate 14 is provided around the outer side of the metal plate 11, and is fixed to the metal plate 11 by a plurality of fixing pins 16, so that the electric power located in the groove 12 is provided. The hot wire 13 is fixed between the metal plate 11 and the fixed plate 14. If the fixing plate 14 extends in a direction substantially orthogonal to the heating wire 13 and can fix the heating wire 13, each dimension such as the thickness, thickness, circumferential length, axial length, and the number of installations are fixed. The installation interval and the like are not particularly limited, and can be set as appropriate depending on the size of the heating object 8, the power output and heating capacity, the thickness of the heating wire, and the like. A plurality of the fixing plates 14 are provided so that the heating wire 13 can be fixed at an upper end side position and a lower end side position that are both ends in the axial direction X in the wound metal plate 11 and between them.

  As shown in FIG. 2A, the fixing pins 16 are preferably provided on both sides of the heating wire 13 to fix the fixing plate 14 that suppresses the heating wire 13 from both sides, but as shown in FIG. The arrangement interval of the heating wire 13 and the arrangement interval of the fixing pin 16 can be made equal, and the heating wire 13 and the fixing pin 16 can be alternately arranged in the length direction of the fixing plate 14. The fixing pin 16 can be screwed to the metal plate 11 as shown in FIG.

When the metal plate 11 is wound around the outer peripheral surface 8A of the heating target 8, the fastening tool 15 can be pulled so that the end portion 11A and the end portion 11B approach each other. For example, FIG. ), A structure including a locking portion 15A and a locking portion 15B provided at the end portion 11A and the end portion 11B, and a tightening portion 15C such as a bolt nut that is screwed so as to tighten them, As shown in FIG. 11 (b), a belt 15D provided on one of the end portions 11A and 11B and a tightening portion 15C having a ratchet (not shown) or the like can be tightened made of a heat resistant material. Structured. Further, in the example shown in FIG. 11 (a), the fastening portions 15C are simply used as metal wires (wires) or the like, and the locking portions 15A and 15B are fastened. In the example shown in FIG. In addition to these, such as a configuration in which the belt 15D is bent and locked to the portion 15C, the metal plate 11 can be always tightened so as to be in close contact with the surface of the heating object 8 as a structure capable of fixing and tightening.
The tightening tool 15 can be used when the heating device 10 is attached to the heating object 8 and then removed.

  According to the heating device 10 in the present embodiment, the heat generated in the heating wire 13 is transmitted in a state where the metal plate 11 using copper having high thermal conductivity is in contact with the outer peripheral surface of the heating target 8 by the entire back surface. Therefore, the outer surface of the heating object 8 can be efficiently heated as heat transfer by surface contact with respect to the heat transfer structure by conventional line contact. At the same time, by heating with the heating wire 13 laid in the groove 12 provided in the metal plate 11, heat loss is reduced during heat transfer from the heating wire 13 to the heating object 8, which is larger than the heating of the heating object 8. Since no heat input is required, it is possible to reduce power loss.

  Further, unlike heat transfer cement, replacement and re-construction of cement are unnecessary in several years, so that the working time can be shortened and the manufacturing cost and maintenance cost as a heating device can be reduced. At the same time, by tightening or loosening the metal plate 11 with the fastener 15, the heating device 10 can be removed and attached to the heating object 8, and workability can be improved. In addition, since the heating device 10 can be physically fastened and fixed to the outer surface 8A in the attachment of the heating device 10 to the heating object 8, by periodically tightening, the space between the back surface of the metal plate 11 and the outer peripheral surface 8A can be obtained. Can avoid floating.

  Furthermore, since it can be attached simply by tightening the metal plate 11, heat transfer by surface contact is possible by matching the back surface shape of the metal plate 11 to the outer peripheral surface 8A regardless of the shape of the outer peripheral surface 8A of the heating object 8. Become. That is, as the flexible attachment, for example, the heating device 11 can be easily fixed and applied to the heating object 8 that is a pipe having a different outer diameter.

  In the present embodiment, as shown in FIG. 4, the heating wire 13 is arranged in each of the plurality of grooves 12 provided in the axial direction X as shown in FIG. One end is connected to the adjacent heating wire 13 and the other lower end is connected to the opposite heating wire 13 in the figure, and the two outermost lower ends in the figure are both not shown. It is also possible to control the power supplied to one heating wire 13 by being connected. In this case, each of the outermost heating wires 13 shown in FIG. 4 is located inside the groove 12 closest to the end portion 11A and the end portion 11B shown in FIG. FIG. 4 shows the arrangement of the heating wires 13 when the metal plate 11 wound in the circumferential direction R in FIG. 1 is developed.

  Furthermore, in the case of the configuration shown in FIG. 4, when the fixing plate 14 can be separated at the end portion 11A and the end portion 11B, the heating wire 13 and the fixing plate 14 are not disassembled from the metal plate 11, It is also possible to disassemble the metal plate 11 from the heating object 8. Thereby, workability at the time of maintenance can also be improved.

Hereinafter, 2nd Embodiment of the heating apparatus which concerns on this invention is described based on drawing.
FIG. 5 is a plan view (a) and a front view (b) showing the heating device in the present embodiment. In the figure, reference numeral 20 denotes the heating device.

  The heating device 20 of the present embodiment is used for the outer peripheral surface 8A of the heating target 8 that is a cylindrical heating container or pipe as in the first embodiment shown in FIG. 1, and as shown in FIG. Provided in the axial direction X intersecting the groove 22, the metal plate 21 wound around the circumferential surface of the outer peripheral surface 8 </ b> A, the heating wire 23 at least partially disposed in the groove 22 provided around the surface of the metal plate, and A fixing plate 24 for fixing the heating wire 23 is provided.

The metal plate 21 is made of copper as in the first embodiment, and is wound so as to cover the heating region of the heating target 8. On the surface of the metal plate 21, grooves 21 are provided in the circumferential direction R so as to have a pitch that is substantially equidistant in the axial direction X of the heating object 8, and the grooves 22 are formed when the metal plate 21 is wound. It is provided in a spiral shape.
The individual grooves 22 are formed at the end 21A and the end 21B of the metal plate 21 as if they are continuous in a spiral shape.
The cross-sectional shape of the groove 22 can be set similarly to the groove 12 shown in FIG.

  As shown in FIG. 5, the heating wire 23 is disposed in a plurality of grooves 22 provided in a spiral shape, and both ends thereof are connected to a power source (not shown).

  As shown in FIG. 5, the fixing plate 24 is provided outside the metal plate 21 so as to extend in the axial direction X, and is fixed to the metal plate 21 by a plurality of fixing pins 26. The heating wire 23 positioned at is fixed between the metal plate 21 and the fixing plate 24. As long as the fixing plate 24 extends in a direction substantially orthogonal to the heating wire 23 and can fix the heating wire 23, the dimensions such as thickness, thickness, and length, the number of installations, and the installation interval are particularly limited. First, it can be set as appropriate depending on the size of the heating object 8, the power output and heating capacity, the thickness of the heating wire, and the like. As shown in FIG. 5, a plurality of, for example, four fixing plates 24 are provided so as to have an equal interval in the circumferential direction of the metal plate 21.

  As shown in FIG. 5B, the fixing pins 26 are preferably provided on both sides of the heating wire 23 in the axial direction X in which the fixing plate 24 extends, and the heating wire 23 is preferably suppressed from both sides in this direction. The fixing pin 26 is screwed to the metal plate 21 as shown in FIG.

  According to the heating device 20 in the present embodiment, an effect equivalent to that of the heating device 10 described in the first embodiment can be achieved.

Hereinafter, 3rd Embodiment of the heating apparatus which concerns on this invention is described based on drawing.
FIG. 6 is a perspective view showing the mounting state of the heating device in the present embodiment, FIG. 7 is a schematic diagram showing an example of the arrangement state of heating wires in the present embodiment, and in the figure, reference numeral 30 denotes the heating device. is there.

  As shown in FIG. 6, the heating device 30 of the present embodiment is used for the outer peripheral surface 9A of the heating target 9 which is a rectangular tube-shaped heating container or pipe, and is wound around the circumferential direction of the outer peripheral surface 9A. A plate 31, a heating wire 33 at least partially disposed in a plurality of grooves 32 provided in parallel with the surface of the metal plate, and a heating wire 33 provided in parallel with the axial direction X intersecting the groove 32. A fixing plate 34 to be fixed is provided.

The metal plate 31 is made of copper as in the first and second embodiments, and is wound so as to cover the heating region of the heating object 9 as shown in FIG. A plurality of grooves 32 are provided on the surface of the metal plate 31 in parallel with the circumferential direction R so as to be substantially equidistant in the axial direction X of the heating object 8.
The individual grooves 32 are formed as if they are continuous around the end 31A and the end 31B of the metal plate 31.
The cross-sectional shape of the groove 32 can be set similarly to the groove 12 shown in FIG.

  As shown in FIG. 6, one heating wire 33 is disposed in each of a plurality of grooves 32 provided in parallel, and both ends thereof are connected to a power source (not shown).

  As shown in FIG. 7, each heating wire 23 is arranged in each of a plurality of grooves 32 provided in the axial direction X, and both ends thereof are connected to a power source (not shown), The power supplied to the heating wire 33 can be controlled. The heating wire 23 is arrange | positioned at the groove | channel 32 so that the edge part 31A and the edge part 31B of the metal plate 31 may not be straddled. 7 shows the arrangement of the heating wire 33 in the case where the metal plate 31 wound in the circumferential direction R in FIG. 6 is developed, and the white circles indicate the ends thereof, and a power source (not shown) Indicates that connection is possible.

  As shown in FIG. 6, the fixing plate 34 is provided outside the metal plate 31 so as to extend in the axial direction X, and is fixed to the metal plate 31 by a plurality of fixing pins 36. The heating wire 33 located at is fixed between the metal plate 31 and the fixed plate 34. As long as the fixing plate 34 extends in a direction substantially orthogonal to the heating wire 33 and can fix the heating wire 33, the dimensions such as thickness and thickness, the number of installations, the installation interval, and the like are not particularly limited. It can be set as appropriate depending on the size of the object 9, the power output and heating capacity, the thickness of the heating wire, and the like. A plurality of the fixing plates 34 are provided so as to have an equal interval in the circumferential direction of the metal plate 31. For example, as shown in FIG. 6, two fixing plates 34 are provided for each of four surfaces of the prismatic heating target 9. For example, eight are provided.

  As shown in FIG. 6, the fixing pins 36 are preferably provided at both side positions of the heating wire 33 in the axial direction X in which the fixing plate 34 extends, and the heating wire 33 is preferably suppressed from both sides in this direction. The fixing pin 36 is screwed to the metal plate 21.

  The fastening tool 35 is configured to correspond to the fastening tool 15 shown in FIGS. 1 and 11, and can be pulled so that the end 31A and the end 31B shown in FIG. 6 approach each other.

  According to the heating device 30 in the present embodiment, the same effects as those of the heating devices 10 and 20 described in the first and second embodiments can be obtained.

  In the present embodiment, the heating wire 33 is disposed in each of the plurality of grooves 32 provided in the axial direction X as shown in FIG. The other heating wire 33 is connected to the adjacent heating wire 33, the other end on the right side in the figure is connected to the opposite heating wire 33, and the two outermost lower ends in the drawing are both connected to a power source (not shown). It is also possible to control the power supplied to the heating wire 33 of the book. The heating wire 33 is arrange | positioned in the groove | channel 32 so that the edge part 31A and the edge part 31B of the metal plate 31 may not be straddled. In this case, both the uppermost heating wire 13 and the uppermost heating wire 13 shown in FIG. 7 are located inside the groove 32 closest to the end portion 31A and the end portion 31B shown in FIG. 6, respectively.

Hereinafter, 4th Embodiment of the heating apparatus which concerns on this invention is described based on drawing.
FIG. 9 is a perspective view showing a disassembled state of the heating device in the present embodiment, and FIG. 10 is a schematic view showing an example of an arrangement state of heating wires in the present embodiment. In the present embodiment, the difference from the first embodiment is the point related to the arrangement state of the metal plate and the heating wire, and the corresponding components are denoted by the same reference numerals and the description thereof is omitted.

  In the present embodiment, the single metal plate 11 in the first embodiment is divided into a plurality of pieces, and as shown in FIG. 9, the metal plate 11a, the metal plate 11b, the metal plate 11c, and the metal plate 11d Are divided in the circumferential direction. The end portions 11B and 11C, the end portions 11D and 11E, the end portions 11F and 11G, and the end portions 11H and 11A that are opposed to each other in the plurality of metal plates 11a to 11d are illustrated. None of them is provided with a fastening tool 15 during assembly. The metal plates 11a to 11d also receive a plurality of fixing pin 16 fixing holes 16a penetrating to the back surface.

  Further, in the present embodiment, the heating wire 13a is disposed in each of the plurality of grooves 12 provided in the axial direction X, as in the first embodiment, and has one end on the upper side in the drawing. A metal plate which is connected to the adjacent heating wire 13 and whose other lower end is connected to the opposite heating wire 13 in the figure, but is divided into four circumferentially as shown in FIG. Corresponding to 11a, metal plate 11b, metal plate 11c, and metal plate 11d, the power supplied to the four heating wires 13a can be controlled so that the respective metal plates are connected to the power source. In this case, each of the heating wires 13a having white circles shown in FIG. 10 is located inside the groove 12 closest to the end portions 11A to 11H shown in FIG. 9, and the heating wires 13a are all end portions 11A to 11A. It does not cross 11H and is not connected to the heating wire 13a of the adjacent metal plate 11 beyond the end portions 11A to 11H. FIG. 10 shows the arrangement of the heating wires 13a when the metal plates 11a to 11d wound in the circumferential direction R in FIG. 9 are developed.

  Furthermore, the fixing plate 14 can be separated at the end portions 11A to 11H. In this case, the heating wire 13a and the fixing plate 14 are not separated from the metal plates 11a to 11d, and these are integrated. Any of the metal plates 11 a to 11 d can be separated from the heating object 8. At this time, since the four metal plates 11a to 11d are not connected by the heating wire 13a, they can be handled separately, thereby further improving the workability during maintenance. It becomes. At the same time, when the metal plates 11a to 11d and the respective heating wires 13a and the fixing plate 14 are attached and detached as a unit, they can be attached and detached only by operating the fastening tool 15. .

  In the present embodiment, the metal plate 11 is divided into four pieces, but any number of divisions such as two pieces and three pieces can be used.

  In each of the above embodiments, the metal plates 11, 21, 31 are made of copper. However, in an environment where the use of copper is regulated, such as when adapted to concentrated boric acid system piping in a nuclear power plant, etc. , SUS, etc., and can be made of other materials such as iron.

8, 9 ... heating object, 8A, 9A ... outer peripheral surface, 10, 20, 30 ... heating device, 11, 11a, 11b, 11c, 11d, 21, 31 ... metal plate, 12, 22, 32 ... groove, 13, 13a, 23, 33 ... heating wire, 14, 24, 34 ... fixing plate, 15, 35 ... tightening tool, 16, 26, 36 ... fixing pin

Claims (5)

A metal plate wound around the circumferential direction of the outer peripheral surface so as to come into contact with the outer peripheral surface of the shafted heating target;
A heating wire laid along the surface of the metal plate so as to contact the metal plate;
A heating apparatus comprising: The metal plate has a groove formed on a surface thereof;
The heating apparatus according to claim 1, wherein the heating wire is laid along the groove so that at least a part of the heating wire is disposed in the groove.   The heating apparatus according to claim 1 or 2, wherein a plurality of the grooves are provided side by side in a circumferential direction of the outer peripheral surface, and a fixing plate for fixing the heating wire is provided in an axial direction intersecting the grooves.   3. The heating apparatus according to claim 1, wherein a plurality of the grooves are arranged in parallel in the axial direction of the outer peripheral surface, and a fixing plate for fixing the heating wire is provided in a circumferential direction intersecting with the grooves.     The heating device according to any one of claims 1 to 4, further comprising a fastening tool for fastening the metal plate to wind the metal plate.

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