Jacketed heater, method for manufacturing jacketed heater, and heat-insulating structure

Abstract

A jacket heater (10) is provided with: a first heat insulating layer (11); a reflective layer (13) disposed on the outside of the first heat insulating layer (11); a second heat insulating layer (12) disposed on the outside of the reflective layer (13); and a heater wire (14) disposed on the inner side of the first heat insulating layer (11). As a result, it is possible to sufficiently heat the piping while suppressing power consumption.

Description

Technical Field

[0001] The present invention relates to a jacketed heater covering a pipe, a method for manufacturing the jacketed heater, and a heat insulation structure. Background Art

[0002] To prevent gas condensation and precipitation within piping, jacket heaters are sometimes used to cover the piping. For example, various gases are used in film formation and etching steps during semiconductor device manufacturing. To prevent these gases from condensing and precipitating within the piping, jacket heaters are sometimes used. Patent Document 1 discloses an example of such a jacket heater.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2011 / 126051 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] Reducing the power consumption of manufacturing equipment is crucial for manufacturing costs and environmental impact. Therefore, it is desirable to reduce power consumption in jacket heaters. Increasing the thickness of the jacket heater's insulation layer can reduce power consumption. However, increasing the thickness of the insulation layer requires more space around the piping to accommodate the jacket heater. Therefore, increasing the thickness of the insulation layer to reduce power consumption may be undesirable.

[0008] Means of solving problems

[0009] The jacket heater proposed in this disclosure is designed for installation around the outer periphery of a pipe. The jacket heater comprises a first insulating layer; a reflective layer disposed outside the first insulating layer; a second insulating layer disposed outside the reflective layer; and a heater wire disposed inside the first insulating layer. The reflective layer minimizes power consumption while providing sufficient heating for the pipe. Furthermore, the second insulating layer disposed outside the reflective layer allows the outer surface of the jacket heater to be cooled to an appropriate temperature. This improves workability around the jacket heater.

[0010] The jacket heater manufacturing method proposed in this disclosure includes the steps of sewing a first insulation layer covering a heater wire, a reflective layer covering the outer side of the first insulation layer, and a second insulation layer covering the outer side of the reflective layer; and sewing the heater wire to the first insulation layer. A jacket heater manufactured using this manufacturing method can reduce power consumption while providing sufficient heating for piping. Furthermore, since the second insulation layer is provided outside the reflective layer, the jacket heater's outer surface temperature can be lowered to an appropriate level. This improves workability around the jacket heater.

[0011] The thermal insulation structure proposed in this disclosure is designed for installation around the outer periphery of a pipe. It comprises a first insulation layer; a reflective layer disposed outside the first insulation layer; a second insulation layer disposed outside the reflective layer; and a heater wire disposed inside the first insulation layer. This insulation structure minimizes power consumption by the heater wire while maintaining sufficient heating of the pipe. Furthermore, the presence of the second insulation layer outside the reflective layer allows the outer surface of the insulation structure to be cooled to an appropriate temperature. This improves workability around the jacket heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view showing a state where the jacket heater proposed in the present disclosure is installed on a pipe.

[0013] Figure 2 For the Figure 1 The cross-sectional view is obtained along the II-II line shown.

[0014] Figure 3A This is a diagram for explaining an example of sewing around the third sensor passage hole formed in the reflective layer, and is a schematic diagram showing the first heat insulating layer side as viewed from the reflective layer side in the thickness direction of the jacket heater.

[0015] Figure 3B This figure is a diagram for explaining another example of the sewing portion around the third sensor passage hole formed in the reflective layer, and is a schematic diagram showing the first heat insulating layer side as viewed from the reflective layer side in the thickness direction of the jacket heater.

[0016] Figure 4 It is a perspective view showing another example of the through hole formed in the reflective layer. DETAILED DESCRIPTION

[0017] The following describes the jacket heater proposed in this disclosure. Figure 1 The jacket heater 10 shown in FIG. 1 is used as an example for explanation.

[0018] like Figure 1As shown, the jacket heater 10 covers the pipe 90. The jacket heater 10 heats the pipe 90 to prevent the gas flowing through the pipe 90 from condensing or precipitating.

[0019] like Figure 2 As shown, the jacket heater 10 includes a heater wire 14 and a heater wire substrate 18 to which the heater wire 14 is attached. The heater wire 14 is, for example, a nickel-chromium metal resistor. The heater wire substrate 18 can be made of, for example, an inorganic fiber cloth composed of inorganic fibers such as glass fiber, silica fiber, alumina fiber, or silica-alumina fiber. The heater wire 14 is sewn to the heater wire substrate 18. The heater wire 14 is connected to an external power source via a lead wire 14b.

[0020] like Figure 2 As shown, the jacket heater 10 includes a first insulation layer 11 and a second insulation layer 12. The first insulation layer 11 is disposed outside of and covers the heater wires 14 and the heater wire substrate 18. The second insulation layer 12 is disposed further outside of and covers the first insulation layer 11.

[0021] The first and second insulation layers 11, 12 are formed, for example, from an inorganic fiber insulation material. Examples of inorganic fibers include glass fiber, ceramic fiber, and silica fiber. Furthermore, the first and second insulation layers 11, 12 may also be made of inorganic or organic insulation materials, such as polyimide and silica, that have voids with an average void width of a certain value or less (for example, voids with an average void width less than the mean free path of air molecules). The material of the first and second insulation layers 11, 12 may be the same or different.

[0022] The first thermal insulation layer 11 may be a single layer or a plurality of layers. Similarly, the second thermal insulation layer 12 may be a single layer or a plurality of layers. When each thermal insulation layer 11 or 12 is a multi-layered structure, the materials of the multi-layered layers may be the same or different.

[0023] The thickness of the first thermal insulation layer 11 can be, for example, 5 mm to 100 mm. The thickness of the second thermal insulation layer 12 can also be 5 mm to 100 mm. These thicknesses can reduce the space required to install the jacket heater 10 while ensuring thermal insulation performance. The thickness of the first thermal insulation layer 11 is preferably 5 mm to 50 mm. The thickness of the first thermal insulation layer 11 is more preferably 8 mm to 30 mm. The thickness of the second thermal insulation layer 12 is preferably 5 mm to 50 mm. The thickness of the second thermal insulation layer 12 is more preferably 8 mm to 30 mm.

[0024] like Figure 2As shown, the jacket heater 10 includes a reflective layer 13 disposed between the first thermal insulation layer 11 and the second thermal insulation layer 12. Heat (electromagnetic waves) emitted from the pipe 90 and the heater wire 14 are thus reflected by the reflective layer 13. As a result, the pipe 90 can be efficiently heated. Furthermore, since the second thermal insulation layer 12 is located outside the reflective layer 13, the outer surface of the jacket heater 10 is cooled to an appropriate temperature. This improves workability around the jacket heater 10.

[0025] The reflective layer 13 is preferably made of a material with high reflectivity for infrared rays. The material of the reflective layer 13 is, for example, metal. Aluminum is preferred, but other metals such as copper and stainless steel may also be used. Furthermore, the reflective layer 13 may be formed of materials other than metals, such as ceramics, silicon carbide, and zirconium oxide.

[0026] The reflective layer 13 is, for example, a metal foil having a thickness of 10 to 700 μm. This thickness maintains the flexibility of the reflective layer 13 and prevents accidental damage to the reflective layer 13. The thickness of the reflective layer 13 is preferably 10 to 200 μm.

[0027] like Figure 1 As shown, the reflective layer 13 may be formed over substantially the entire circumference of the pipe 90. That is, the reflective layer 13 may surround the pipe 90 substantially 360 degrees. Furthermore, the reflective layer 13 may be provided over substantially the entire jacket heater 10 in the longitudinal direction of the pipe 90.

[0028] like Figure 2 As shown, the jacket heater 10 includes an inner skin layer 16 disposed inside a heater wire substrate 18. An insulating layer 15 may be disposed between the inner skin layer 16 and the heater wire substrate 18 to reliably insulate the heater wire 14 from the pipe 90. Furthermore, the jacket heater 10 includes an outer skin layer 17 covering the outside of the second thermal insulation layer 12.

[0029] As for the outer skin layer 17 and the inner skin layer 16, for example, heat-resistant sheets (including cloth materials) can be used. The material of the outer skin layer 17 and the material of the inner skin layer 16 can be the same or different. As for the outer skin layer 17 and the inner skin layer 16, for example, porous sheets, inorganic fiber sheets, resin sheets, etc. can be used. Examples of porous sheets include PTFE (polytetrafluoroethylene) sheets. Examples of inorganic fiber sheets include glass fiber cloth. Resin sheets include fluorine resin sheets. In addition, the inorganic fiber sheets can also be coated with silicone or fluorine.

[0030] The jacket heater 10 is flexible. Specifically, the layers comprising the jacket heater 10, namely, the thermal insulation layers 11 and 12, the reflective layer 13, the outer skin layer 17, the inner skin layer 16, the heater wire 14, and the heater wire base material 18, are all flexible. During this construction step, the jacket heater 10 is wrapped around the outside of the pipe 90 to form a cylindrical shape.

[0031] The jacket heater 10 has a fixing member that fixes the jacket heater 10 in a state where the jacket heater 10 is wound around the pipe 90. The jacket heater 10 has, for example, a plurality of hook and loop fasteners 22 arranged along an edge of one side of the jacket heater 10 (see FIG. Figure 1 ) as a fixing member. A hook and loop fastener 22 can be attached to the outer surface of the jacket heater 10. The hook and loop fastener 22 is attached to the edge of the jacket heater 10 on the opposite side of the jacket heater 10 when the jacket heater 10 is wrapped around the pipe 90. Here, the fixing member is not limited to the hook and loop fastener 22. The fixing member can also be composed of a hook, or a tape wrapped around the outside of the jacket heater 10.

[0032] [Wire through hole]

[0033] like Figure 2 As shown, a first wire hole 11b is formed in the first thermal insulation layer 11. A second wire hole 12b is formed in the second thermal insulation layer 12. A third wire hole 13b is formed in the reflective layer 13. The wire holes 11b, 12b, and 13b extend through the thermal insulation layers 11, 12, and the reflective layer 13 along their thickness. The first, second, and third wire holes 11b, 12b, and 13b can be positioned substantially identically along the length and circumference of the pipe 90. That is, when viewing the jacket heater 10 along its thickness, a portion of the second and third wire holes 12b and 13b can overlap with the first wire hole 11b. The first, second, and third wire holes 11b, 12b, and 13b can form a single hole extending along the thickness of the jacket heater 10.

[0034] like Figure 2 As shown, a wire 14b is connected to the heating wire 14. The wire 14b extends from the heating wire 14 through the first wire through hole 11b, the third wire through hole 13b and the second wire through hole 12b to the outside of the second insulation layer 12.

[0035] The lead wire 14b can extend toward the outside of the jacket heater 10 through the opening 17a formed in the outer skin layer 17. The heater wire 14 can be connected to an external power source (control device that controls the current supplied to the heater wire 14) via the lead wire 14b. Figure 2In the example shown, the lead wire 14b extends toward the outside of the jacket heater 10 through the opening 17a that penetrates the outer skin layer 17 along the thickness direction of the outer skin layer 17 (the radial direction of the pipe 90). Alternatively, the lead wire 14b may extend toward the outside of the jacket heater 10 through a gap formed at the edge of the outer skin layer 17.

[0036] The heating wire 14 can be connected to two conductive wires 14b. These two conductive wires 14b can extend to the outside of the second insulation layer 12 through common conductive wire holes 11b, 12b, and 13b. Alternatively, separate conductive wire holes 11b, 12b, and 13b can be formed for each of the two conductive wires 14b. That is, conductive wire holes 11b, 12b, and 13b can be formed in the first insulation layer 11, the second insulation layer 12, and the reflective layer 13 for the first conductive wire 14b to pass through, and conductive wire holes 11b, 12b, and 13b can be formed in the first insulation layer 11, the second insulation layer 12, and the reflective layer 13 for the second conductive wire 14b to pass through.

[0037] The third wire hole 13b can be formed inside the outer periphery of the reflective layer 13. That is, the inner periphery of the third wire hole 13b can be in the shape of a ring surrounding the wire 14b. Similarly, the first wire hole 11b and the second wire hole 12b can be formed inside the outer periphery of the thermal insulation layers 11 and 12. That is, the inner periphery of the first wire hole 11b and the second wire hole 12b can be in the shape of a ring surrounding the wire 14b.

[0038] Alternatively, the third wire passage hole 13b may be a recessed portion formed in the outer periphery of the reflective layer 13. Similarly, the first wire passage hole 11b and the second wire passage hole 12b may also be recessed portions formed in the outer peripheries of the heat-insulating layers 11 and 12. Furthermore, these recessed portions may be positioned substantially uniformly in the longitudinal and circumferential directions of the pipe 90.

[0039] The size of the third wire through hole 13b can be larger than the size of each of the first wire through hole 11b and the second wire through hole 12b. Figure 2 ) is larger than the diameter of each of the first and second wire passage holes 11b, 12b. Consequently, the positional changes of wire 14b within third wire passage hole 13b are restricted by wire passage holes 11b and 12b. Consequently, contact between wire 14b and reflective layer 13 is suppressed. This configuration prevents current from flowing from wire 14b to reflective layer 13, even if the outer layer of wire 14b is damaged, thereby preventing the reflective layer 13 from becoming charged.

[0040] Here, when each wire hole 11b, 12b, or 13b is circular, the size of each wire hole 11b, 12b, or 13b can be the diameter of the hole. Furthermore, when each wire hole 11b, 12b, or 13b is rectangular, the size of each wire hole 11b, 12b, or 13b can be the width of one side of the inner edge of the hole. The first wire hole 11b and the second wire hole 12b can be located at the center of the third wire hole 13b.

[0041] and Figure 2 Unlike the illustrated example, the diameter Rb of the third wire hole 13b can be larger than the diameter of one of the two wire holes 11b and 12b, but equal to or smaller than the diameter of the other. For example, the diameter Rb of the third wire hole 13b can be larger than the diameter of the first wire hole 11b, but equal to or smaller than the diameter of the second wire hole 12b. Even in this case, the positional change of the wire 14b inside the third wire hole 13b can be limited by the first wire hole 11b.

[0042] The shape of the third wire through hole 13b may be rectangular, for example. In this case, the width of one side of the inner edge of the third wire through hole 13b may be greater than the width of one side of the inner edge of the wire through holes 11b and 12b.

[0043] The diameters of the wire holes 11b and 12b formed in the thermal insulation layers 11 and 12 can correspond to the thickness of the wire 14b. In other words, the inner surfaces of the thermal insulation layers 11 and 12 at the wire holes 11b and 12b can contact the wire 14b. This effectively prevents the wire 14b from shifting in position inside the third wire hole 13b.

[0044] Furthermore, the diameters of the first and second wire holes 11b and 12b may differ. For example, the diameter of the first wire hole 11b may correspond to the thickness of the wire 14b, with the inner surface of the first wire hole 11b in contact with the wire 14b, while the diameter of the second wire hole 12b may be larger than the thickness of the wire 14b (in this case, the diameter of the first wire hole 11b). This facilitates the passage of the wire 14b through the second wire hole 12b. The size relationship between the wire holes 11b and 12b may also be reversed from the example described here.

[0045] The distance between the inner edges of the wire holes 11b and 12b and the inner edge of the third wire hole 13b is preferably 3 mm or more, and more preferably 5 mm or more. This effectively prevents the wire 14b from contacting the reflective layer 13.

[0046] [Sensor through hole]

[0047] like Figure 2 As shown, the jacketed heater 10 includes a sensor 19. Sensor 19 includes a temperature-sensing portion 19A. Specifically, sensor 19 is a thermocouple. Temperature-sensing portion 19A contains two bare wires (not shown) made of different materials. Temperature-sensing portion 19A insulates and holds the two bare wires. Temperature-sensing portion 19A has a metal sheath on its surface, and the bare wires can be positioned inside the sheath. Temperature-sensing portion 19A may include more than two bare wires.

[0048] The tip 19e of the temperature sensing portion 19A is located inside the first heat-insulating layer 11. The tip 19e of the temperature sensing portion 19A may be exposed inside the inner skin layer 16 and directly contact the outer surface of the pipe 90. The sensor 19 may include a lead 19b, which is connected to an external device (e.g., a control device that controls the current supplied to the heater wire 14) via the lead 19b.

[0049] like Figure 2 As shown, a first sensor hole 11a is formed in the first insulation layer 11. A second sensor hole 12a is formed in the second insulation layer 12. A third sensor hole 13a is formed in the reflective layer 13. The sensor holes 11a, 12a, and 13a extend through the insulation layers 11, 12, and the reflective layer 13 along their thickness. The first, second, and third sensor holes 11a, 12a, and 13a can be positioned substantially identically along the length and circumference of the pipe 90. That is, when viewing the jacket heater 10 along its thickness, portions of the second and third sensor holes 12a, 13a can overlap with the first sensor hole 11a. As a result, the first, second, and third sensor holes 11a, 12a, and 13a can form a single hole extending along the thickness of the jacket heater 10.

[0050] like Figure 2 As shown, the sensor 19 extends from the front end 19e of the temperature sensing portion 19A located inside the first thermal insulation layer 11, sequentially passing through the first sensor through hole 11a, the third sensor through hole 13a, and the second sensor through hole 12a, to the outside of the second thermal insulation layer 12. Here, a through hole for the sensor 19 to pass through may also be formed in a member located further inside the first thermal insulation layer 11, such as the endothelium 16.

[0051] like Figure 2As shown, the temperature sensing portion 19A may include a first portion 19g, a second portion 19h, and a third portion 19i. The first portion 19g is located inside the inner skin layer 16, the second portion 19h is located inside the sensor passage holes 11a, 12a, and 13a, and the third portion 19i is located outside the second thermal insulation layer 12. Furthermore, the second portion 19h can be bent relative to the first portion 19g, and the third portion 19i can be bent relative to the second portion 19h. The third portion 19i can extend between the second thermal insulation layer 12 and the outer skin layer 17 along the longitudinal direction or the circumferential direction of the pipe 90. The temperature sensing portion 19A may be flexible and bendable as described above.

[0052] like Figure 2 As shown, the temperature sensing portion 19A and the lead 19b may be connected to each other at a position outside the second heat insulating layer 12. The lead 19b may extend from the opening 17a formed in the outer skin layer 17 to the outside of the jacket heater 10. Figure 2 In the example shown, the wire 19b and the wire 14b extending from the heater wire 14 extend from the common opening 17a toward the outside of the jacket heater 10. However, the wire 19b and the wire 14b may extend from another opening toward the outside of the jacket heater 10.

[0053] In addition, with Figure 2 Different from the example shown, the entire temperature sensing portion 19A may be disposed inside the first heat insulating layer 11. In this case, the lead wire 19b may pass through the inner sides of the sensor passage holes 11a, 12a, and 13a.

[0054] The size of the third sensor through hole 13a is larger than the size of each of the first sensor through hole 11a and the second sensor through hole 12a. Figure 2 As shown, the diameter Ra of the third sensor hole 13a is larger than the diameters of the first and second sensor holes 11a, 12a. Consequently, the positional changes of the sensor 19 within the third sensor hole 13a are restricted by the sensor holes 11a and 12a. Consequently, contact between the sensor 19 and the reflective layer 13 is suppressed. This prevents current from flowing through the sensor 19 to the piping 90, even if the reflective layer 13 becomes charged.

[0055] Here, when the sensor holes 11a, 12a, and 13a are circular, the size of the sensor holes 11a, 12a, and 13a can be the diameter of the holes. Furthermore, when the sensor holes 11a, 12a, and 13a are rectangular, the size of the sensor holes 11a, 12a, and 13a can be the width of one side of the inner edge of the holes.

[0056] Here, the distance between the inner edge of the sensor holes 11a and 12a and the inner edge of the third sensor hole 13a is preferably 3 mm or more. More preferably, this distance is 5 mm or more. This effectively prevents the sensor 19 from contacting the reflective layer 13.

[0057] Here, with Figure 2 Unlike the example shown, the diameter Ra of the third sensor hole 13a can be larger than the diameter of one of the first and second sensor holes 11a, 12a, but equal to or smaller than the diameter of the other. For example, the diameter Ra of the third sensor hole 13a can be larger than the diameter of the first sensor hole 11a, but equal to or smaller than the diameter of the second sensor hole 12a. Even in this case, the positional change of the sensor 19 inside the third sensor hole 13a can be limited by the first sensor hole 11a.

[0058] The shape of the third sensor hole 13a may be rectangular, for example. In this case, the width of one side of the inner edge of the third sensor hole 13a may be greater than the width of one side of the inner edge of the sensor holes 11a and 12a.

[0059] The diameters of sensor holes 11a and 12a formed in thermal insulation layers 11 and 12 correspond to the thickness of sensor 19. In other words, the inner surfaces of sensor holes 11a and 12a in thermal insulation layers 11 and 12 can contact sensor 19 (e.g., temperature sensing portion 19A). This effectively suppresses positional changes of sensor 19 within third sensor hole 13a.

[0060] Here, the diameters of the first sensor hole 11a and the second sensor hole 12a can differ. For example, the diameter of the first sensor hole 11a can correspond to the thickness of the sensor 19 (e.g., the temperature sensing portion 19A), with the inner surface of the first sensor hole 11a in contact with the sensor 19, while the diameter of the second sensor hole 12a can be larger than the thickness of the sensor 19 (in this case, the diameter of the first sensor hole 11a). This facilitates the passage of the sensor 19 through the second sensor hole 12a. The size relationship between the sensor holes 11a and 12a can also be reversed from the example described here.

[0061] like Figure 2 As shown, the third sensor hole 13a can be formed further inward than the outer periphery of the reflective layer 13. That is, the inner edge of the third sensor hole 13a can be annular and surround the sensor 19. Similarly, the first sensor hole 11a and the second sensor hole 12a can be formed further inward than the outer peripheries of the thermal insulation layers 11 and 12.

[0062] and Figure 2 Different from the example shown, the third sensor hole 13a may be a recessed portion formed in the outer periphery of the reflective layer 13. Similarly, the first sensor hole 11a and the second sensor hole 12a may be recessed portions formed in the outer peripheries of the heat insulating layers 11 and 12. Furthermore, the longitudinal and circumferential positions of the pipe 90 may be substantially the same.

[0063] [Suture of reflective layer and thermal insulation layer]

[0064] The heat-insulating layers 11 and 12 and the reflective layer 13 can be sewn together using heat-resistant thread. Examples of the heat-resistant thread include glass yarn, silica yarn, alumina yarn, or a thread formed by coating glass yarn, silica yarn, or alumina yarn with a fluorine resin.

[0065] like Figure 3A and Figure 3B As shown, the third sensor hole 13a can be surrounded by a thread 31a. That is, the reflective layer 13 and the first thermal insulation layer 11 can be sewn together using the thread 31a surrounding the third sensor hole 13a. This effectively prevents positional displacement between the third sensor hole 13a and the first sensor hole 11a. Consequently, contact between the sensor 19 and the reflective layer 13 can be more effectively prevented.

[0066] like Figure 3A As shown, the line 31a may include a portion located inside the inner edge of the third sensor through hole 13a and a portion located outside the inner edge of the third sensor through hole 13a. Figure 3B As shown, all the wires 31 a surrounding the third sensor through hole 13 a may be located outside the inner edge of the third sensor through hole 13 a.

[0067] The periphery of the third wire through hole 13b through which the wire 14b of the heating wire 14 passes can also be Figure 3A and Figure 3B The thread 31a is similarly used for sewing. That is, the reflective layer 13 and the first heat insulating layer 11 can be sewn together using the thread 31a that is wound around the third wire through hole 13b.

[0068] The reflective layer 13 may also be sewn to the first thermal insulation layer 11 at other locations using heat-resistant thread. These sewing locations may be located along the outer periphery of the reflective layer 13, surrounding the entire reflective layer 13, or may be located only at multiple locations within the inner periphery of the reflective layer 13. Furthermore, the second thermal insulation layer 12 may also be sewn to the first thermal insulation layer 11 and the reflective layer 13 using thread. Furthermore, to increase the strength of the sewing, the first thermal insulation layer 11 and the reflective layer 13 may also be sewn to the heater wire base material 18 and the inner skin layer 16 of the heater wire 14 using thread.

[0069] [Common through hole]

[0070] Here, the structures of the wire through holes 11b, 12b, 13b and the sensor through holes 11a, 12a, 13a are not limited to Figure 2 Examples shown.

[0071] Figure 4 This figure shows a modified example of through-holes. In the example shown in this figure, a wire through-hole 13c is formed in the reflective layer 13. When viewing the jacketed heater 10 from above (when viewing the through-hole 13c along the radius of the pipe 90), the sensor through-holes 11a, 12a and the wire through-holes 11b, 12b are located inside the wire through-hole 13c. Therefore, the wire 14b of the heater wire 14 extends outside the thermal insulation layer 12 through the wire through-holes 11b, 12b, and the wire through-hole 13c. Furthermore, the sensor 19 also extends outside the thermal insulation layer 12 through the sensor through-holes 11a, 12a, and the wire through-hole 13c. This structure reduces the number of through-holes formed in the reflective layer 13. Consequently, the number of manufacturing steps for the reflective layer 13 can be reduced.

[0072] The size of wire hole 13c is larger than that of sensor holes 11a, 12a, and wire holes 11b, 12b. For example, the distance from the inner edge of wire hole 13c to the inner edges of holes 11a, 12a, 11b, and 12b is preferably at least 3 mm. This distance is preferably at least 5 mm. This prevents contact between wire 14b and reflective layer 13. For example, even if the outer layer of wire 14b is damaged, current flowing from wire 14b to reflective layer 13, thereby charging reflective layer 13, can be prevented. Furthermore, contact between sensor 19 and reflective layer 13 can be suppressed. This configuration prevents current from flowing through sensor 19 to piping 90 in the event that reflective layer 13 becomes charged.

[0073] [Thermostat]

[0074] like Figure 2 As shown, the jacket heater 10 may include a thermostat 21. The thermostat 21 may be connected to the heater wire 14 or to an external power source (a control device that supplies current to the heater wire 14) via a wire (not shown). Upon detecting an excessive temperature rise in the heater wire 14, the thermostat 21 enters a shutoff state, stopping the current supply to the heater wire 14.

[0075] like Figure 2As shown, the second heat insulating layer 12 can form a housing chamber 12d for housing the thermostat 21. The thermostat 21 can be arranged outside the reflective layer 13. By arranging the thermostat 21 in this way, the temperature of the thermostat 21 will be lower than the inner surface of the jacket heater 10 on which the heater wire 14 is arranged and lower than the temperature of the pipe 90. As a result, even in a case where the output of the jacket heater 10 must be increased to increase the temperature of the pipe 90, a small thermostat with a low operating temperature (current cutoff temperature) can be used as the thermostat 21 to prevent the jacket heater 10 from overheating. For example, when the temperature of the pipe is to be raised to 300°C by heating the jacket heater, a large thermostat with an operating temperature set to 300°C or above is generally required. However, in the jacket heater 10 proposed in the present disclosure, since the thermostat 21 is arranged outside the reflective layer 13, the peripheral temperature of the thermostat 21 does not reach 300°C. Therefore, the thermostat 21 can use a thermostat with an operating temperature lower than 300°C (for example, a small thermostat with an operating temperature of about 200°C), and the pipe 90 can be heated to a temperature much higher than its operating temperature (300°C in the example described here).

[0076] In addition, with Figure 2 Different from the example shown, the thermostat 21 may also be arranged on the inner side of the reflective layer 13 .

[0077] [Method for manufacturing jacketed heater]

[0078] Here, an example of a method for manufacturing a jacket heater 10 is described. An operator prepares a first heat insulating layer 11 and a second heat insulating layer 12. An operator forms a first wire through hole 11b and a first sensor through hole 11a in the first heat insulating layer 11, and forms a second wire through hole 12b and a second sensor through hole 12a in the second heat insulating layer 12. Furthermore, an operator prepares a reflective layer 13, and forms a third wire through hole 13b and a third sensor through hole 13a in the reflective layer 13. At this time, as shown in FIG. Figure 4 As shown, a conductive line through hole 13 c may also be formed on the reflective layer 13 .

[0079] The operator sews the first insulation layer 11, the reflective layer 13, and the second insulation layer 12 together using heat-resistant thread 31a. At this point, the operator can also sew the first insulation layer 11 and the reflective layer 13 together, and then sew the second insulation layer 12 to the first insulation layer 11 and the reflective layer 13. In another example, the operator can sew the first insulation layer 11, the reflective layer 13, and the second insulation layer 12 together. Furthermore, the operator sews the heater wire 14 to the heater wire base 18. At this point, the operator can also sew the insulating layer 15 to the heater wire 14 and the heater wire base 18.

[0080] Next, the operator passes the lead wire 14b of the heater wire 14 through the lead wire holes 11b, 12b, and 13b and pulls it out to the outside of the second thermal insulation layer 12. The operator then covers the inner side of the heater wire 14, the insulating layer 15, and the heater wire base material 18 with the inner layer 16. The operator then passes the sensor 19 through the holes formed in the inner layer 16, the insulating layer 15, and the heater wire base material 18, and then through the sensor holes 11a, 13a, and 12a and pulls it out to the outside of the second thermal insulation layer 12. The operator then covers the outer side of the second thermal insulation layer 12 with the outer layer 17, and passes the lead wires 14b and 19b through the opening 17a formed in the outer layer 17 and pulls them out to the outside of the jacket heater 10. The operator then sews the inner and outer layers 16 and 17 together, housing the heater wire 14, the first thermal insulation layer 11, and other components inside the inner and outer layers 16 and 17.

[0081] [Summarize]

[0082] (1) The jacket heater 10 includes a first thermal insulation layer 11; a reflective layer 13 disposed outside the first thermal insulation layer 11; a second thermal insulation layer 12 disposed outside the reflective layer 13; and a heater wire 14 disposed inside the first thermal insulation layer 11. The jacket heater 10 includes the reflective layer 13, thereby enabling sufficient heating of the pipe 90 while minimizing power consumption. Furthermore, the presence of the second thermal insulation layer 12 outside the reflective layer 13 allows the outer surface of the jacket heater 10 to be kept at an appropriate temperature. Consequently, workability around the jacket heater 10 is improved.

[0083] (2) In the structure of (1), the heating wire 14 may be connected to the wire 14b. The first insulation layer 11 may be formed with a first wire through hole 11b, the second insulation layer 12 may be formed with a second wire through hole 12b, and the reflective layer 13 may be formed with a third wire through hole 13b (or through hole 13c, Figure 4 Wire 14b can extend outside second thermal insulation layer 12 through first wire hole 11b, third wire hole 13b (or hole 13c), and second wire hole 12b. Third wire hole 13b (or hole 13c) can be larger than at least one of first wire hole 11b and second wire hole 12b. This configuration prevents wire 14b connected to heater wire 14 from contacting conductive reflective layer 13. Consequently, reflective layer 13 can be prevented from becoming electrically charged.

[0084] (3) In the configuration of (1) or (2), the jacket heater 10 may include a sensor 19 having a temperature sensing portion 19A with at least a front end portion 19e located inside the first heat insulating layer 11. The first heat insulating layer 11 may be formed with a first sensor through hole 11a, the second heat insulating layer 12 may be formed with a second sensor through hole 12a, and the reflective layer 13 may be formed with a third sensor through hole 13a (or through hole 13c, Figure 4 Sensor 19 can extend from its front end 19e through first sensor hole 11a, third sensor hole 13a (or hole 13c), and second sensor hole 12a to the outside of second thermal insulation layer 12. The size of third sensor hole 13a (or hole 13c) can be larger than at least one of first sensor hole 11a and second sensor hole 12a. This structure prevents sensor 19 from coming into contact with conductive reflective layer 13. As a result, even if reflective layer 13 becomes charged, this current can be prevented from flowing through sensor 19 into the piping.

[0085] (4) In the configuration of (2), the jacket heater 10 may include a sensor 19 having a temperature sensing portion 19A with at least a front end portion 19e located inside the first heat insulating layer 11. A first sensor through hole 11a may be formed in the first heat insulating layer 11, and a second sensor through hole 12a may be formed in the second heat insulating layer 12. The sensor 19 may be inserted from the front end portion 19e through the first sensor through hole 11a and the lead through hole 13c (see FIG. Figure 4 ) and the second sensor through hole 12a, extending to the outside of the second heat-insulating layer 12. With this structure, the sensor 19 and the lead 14b pass through the same through hole 13c, thereby reducing the number of through holes formed in the reflective layer 13. As a result, the number of manufacturing steps for the reflective layer 13 can be reduced.

[0086] (5) In the configuration of (2), the size of at least one of the first wire hole 11b and the second wire hole 12b may correspond to the thickness of the wire 14b. This configuration can more effectively suppress positional variations of the wire 14b within the third wire hole 13b. As a result, contact between the reflective layer 13 and the wire 14b can be more effectively suppressed.

[0087] (6) In the configuration of (3), the size of at least one of the first sensor hole 11a and the second sensor hole 12a may correspond to the thickness of the sensor 19. This configuration can more effectively suppress positional changes of the sensor 19 inside the third sensor hole 13a. As a result, contact between the reflective layer 13 and the sensor 19 can be more effectively suppressed.

[0088] (7) In the structure of (2) or (5), the first heat-insulating layer 11 and the reflecting layer 13 can utilize the heat-resistant thread 31a ( Figure 3A and Figure 3B ) sewed. Thread 31a can be wrapped around the periphery of third wire hole 13b. This configuration can suppress the relative positional shift of third wire hole 13b and wire holes 11b and 12b. As a result, contact between reflective layer 13 and wire 14b can be more effectively suppressed.

[0089] (8) In the structure of (3) or (6), the first heat-insulating layer 11 and the reflecting layer 13 can utilize the heat-resistant thread 31a ( Figure 3A and Figure 3B ) sewed. Thread 31a surrounds the periphery of third sensor hole 13a. This configuration prevents displacement of the relative position of third sensor hole 13a and sensor holes 11a and 12a. As a result, contact between reflective layer 13 and conductive wire 14b can be more effectively suppressed.

[0090] (9) A method for manufacturing a jacket heater 10 for installation on the periphery of a pipe 90 includes: a step of sewing a first heat-insulating layer 11 for covering a heating wire 14, a reflective layer 13 covering the outside of the first heat-insulating layer 11, and a second heat-insulating layer 12 covering the outside of the reflective layer 13; and a step of sewing the heating wire 14 to the first heat-insulating layer 11.

[0091] (10) The heat-insulating structure for installation on the outer periphery of the pipe 90 includes: a first heat-insulating layer 11; a reflective layer 13, which is arranged on the outside of the first heat-insulating layer 11; a second heat-insulating layer 12, which is arranged on the outside of the reflective layer 13; and a heating wire 14, which is arranged on the inside of the first heat-insulating layer 11.

[0092] The jacket heater proposed in the present disclosure is not limited to the above-described examples and can be modified in various ways. For example, the jacket heater can have multiple insulation structures, each of which includes a first insulation layer 11 , a reflective layer 13 , and a second insulation layer 12 .

Claims

1. A jacket heater for installation on the outer periphery of a pipe, the jacket heater comprising: First insulation layer; a reflective layer disposed on an outer side of the first heat-insulating layer; a second heat-insulating layer disposed on an outer side of the reflecting layer; and The heating wire is arranged inside the first heat insulation layer.

2. The jacketed heater according to claim 1, wherein The heating wire is connected with a wire. The first heat insulation layer is formed with a first wire passing hole, The second heat insulation layer is formed with a second wire passing hole. A third wire passing hole is formed on the reflective layer. The reflective layer is conductive. The wire extends to the outside of the second insulation layer through the first wire through hole, the third wire through hole, and the second wire through hole. The third wire through hole has a size larger than that of at least one of the first wire through hole and the second wire through hole.

3. The jacket heater according to claim 1 or 2, comprising a sensor having a temperature sensing portion with at least a front end portion located inside the first heat insulating layer. A first sensor passage hole is formed on the first heat insulation layer. A second sensor passage hole is formed on the second heat insulation layer. A third sensor passage hole is formed on the reflective layer. The reflective layer is conductive. The sensor extends from the front end portion through the first sensor through hole, the third sensor through hole, and the second sensor through hole to the outside of the second heat insulation layer. A size of the third sensor through hole is larger than a size of at least one of the first sensor through hole and the second sensor through hole.

4. The jacket heater according to claim 2, comprising a sensor having a temperature sensing portion at least a front end of which is located inside the first heat insulating layer. A first sensor passage hole is formed on the first heat insulation layer. A second sensor passage hole is formed on the second heat insulation layer. The sensor extends from the front end portion to the outside of the second heat insulating layer through the first sensor through hole, the third wire through hole, and the second sensor through hole.

5. The jacketed heater according to claim 2, wherein: A size of at least one of the first wire through hole and the second wire through hole corresponds to a thickness of the wire.

6. The jacketed heater according to claim 3, wherein: A size of at least one of the first sensor passage hole and the second sensor passage hole corresponds to a thickness of the sensor.

7. The jacketed heater according to claim 2 or 5, wherein: The first heat insulating layer and the reflective layer are sewn together with heat-resistant thread. The wire surrounds the circumference of the third wire passing hole.

8. The jacketed heater according to claim 3 or 6, wherein: The first heat insulating layer and the reflective layer are sewn together with heat-resistant thread. The wire surrounds the circumference of the third sensor passage hole.

9. A method for manufacturing a jacket heater, the method comprising: A step of sewing a first heat insulating layer for covering the heating wire, a reflective layer covering the outer side of the first heat insulating layer, and a second heat insulating layer covering the outer side of the reflective layer; and The step of sewing the heating wire to the first insulation layer.

10. A heat insulating structure for installation on the outer periphery of a pipe, the heat insulating structure comprising: First insulation layer; a reflective layer disposed on an outer side of the first heat-insulating layer; a second heat-insulating layer disposed on an outer side of the reflecting layer; and The heating wire is arranged inside the first heat insulation layer.

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