Covering body with heating element and thermocouple

Abstract

The present invention is a covering body for covering an object, the covering body comprising: an inner layer section disposed on the side close to the object, an outer layer section disposed on the side close to the object, an inner-layer-side heat-insulating member, an outer-layer-side heat-insulating member, a heat-generating element, a sheet, and a thermocouple, the inner layer section being disposed on the side close to the object, and the outer layer section being disposed on the side close to the outer-layer-side heat-insulating member; the outer layer part is configured on one side far away from the object; the inner layer side heat insulation component is configured on the outer layer part side of the inner layer part; the outer layer side heat insulation component is configured on the inner layer part side of the outer layer part; the heating element is arranged between the inner layer side heat insulation component and the outer layer side heat insulation component; the sheet is provided with a step part on the side, closer to the object, of the inner layer part; the thermocouple is provided on a side of the step portion closer to the object.

Description

Technical Field

[0001] The present invention relates to a coating body having a heat-generating element and a thermocouple, and more particularly to a coating body capable of heating a pipe, for example, for supplying or exhausting a gas, to a desired temperature and maintaining the temperature. Background Art

[0002] As a covering body capable of heating a pipe for supplying or exhausting a gas to a desired temperature and maintaining the temperature, Japanese Patent Application Publication No. 6616265 (Patent Document 1) discloses the following structure.

[0003] like Fig.21 (Compared to Japanese Patent Application No. 6616265 (Patent Document 1) Figure 4 As shown in (c) corresponding to the invention), the covering body of Japanese Patent Authorization Gazette No. 6616265 (Patent Document 1) has stacked between an inner layer portion 510 and an outer layer portion 500 (both of which are fluororesin materials): a heating element 530 such as a heating wire, an insulating component 540 (glass cloth material) supporting the heating element 530 on the inner layer side, and an insulating portion 520 (glass fiber: glass fiber) arranged on the outer layer side of the heating element 530.

[0004] exist Fig.21 In the example of FIG. 5 , a metal sheet 400 is further provided between the heat insulating member 540 and the inner layer 510, and a heat insulating member 600 (alumina fabric material) having a large heat storage coefficient is provided at a position closer to the inner side (gas pipe 110 side) of the inner layer 510. The metal sheet 400 and the heat insulating member 600 are arranged to make the heating degree of the gas pipe uniform.

[0005] Furthermore, in order to use the actual temperature of the gas pipe 110 for feedback control of the heating element 530, a temperature detection unit 555 such as a plate-shaped heat collecting plate is provided in contact with the gas pipe 110. The temperature detection unit 555 is installed at a position closer to the inner side (gas pipe 110 side) of the heat insulating component 600. Fig.21 A thermocouple not shown in the figure is connected to the temperature detection unit 555. Fig.21 In the example of , a thermal switch 560 as a temperature switch (control unit) is also installed at a position closer to the inner side (gas piping 110 side) of the heat insulating component 600.

[0006] According to the above-described covering body, since the heat of the gas pipe 110 is easily directly transferred to the temperature detection unit 555 such as the plate-shaped heat collecting plate, the thermocouple connected to the temperature detection unit 555 can detect the temperature of the gas pipe 110, although it is detected indirectly. Therefore, the temperature information detected by the thermocouple can be used for feedback control of the heating element 530. Prior art literature Patent Literature

[0007] Patent Document 1: Japanese Patent Publication No. 6616265 Summary of the invention [Technical problem to be solved by the invention]

[0008] The inventors of the present application have discovered that when using a thermocouple to measure the temperature of a pipe, the aforementioned plate-shaped heat collecting plate (which refers to a metal plate or foil with high thermal conductivity (for example, stainless steel, aluminum, or other metal with thermal conductivity equal to or higher than that of a thermocouple) auxiliaryly mounted on the thermocouple in order to enable the thermocouple to more effectively detect the surrounding heat) is not provided, but the thermocouple is made to directly contact (in addition to direct contact, at least at the time of filing the application, a film, a patch, etc. that has little effect on the temperature measurement is not excluded) the surface of the pipe (when the pipe body is covered with a resin, etc., the resin surface is the pipe surface), so that temperature measurement can be implemented with higher accuracy.

[0009] However, on the other hand, it has been found that in a configuration where the thermocouple is exposed only inside the heat insulating member 600 , the contact state between the thermocouple and the pipe surface is unstable, and temperature measurement may not be performed with high accuracy.

[0010] Furthermore, as described above, when the heat insulating member 600 is configured to uniformly cover the entire pipe to improve temperature uniformity, the inventors of the present application have found that even if this function is partially sacrificed, it will not significantly affect the temperature uniformity of the entire pipe.

[0011] The present invention is made based on the above findings. An object of the present invention is to provide a package having a heating element and a thermocouple, which can achieve high-precision temperature measurement by bringing the thermocouple into direct contact with a surface of an object in a stable manner. [Technical solutions for solving technical problems]

[0012] The present invention provides a covering body for covering an object, characterized in that the covering body has an inner layer portion, an outer layer portion, an inner layer side heat insulation component, an outer layer side heat insulation component, a heating element, a sheet and a thermocouple, wherein the inner layer portion is arranged on a side close to the object; the outer layer portion is arranged on a side away from the object; the inner layer side heat insulation component is arranged on the outer layer side of the inner layer portion; the outer layer side heat insulation component is arranged on the inner layer side of the outer layer portion; the heating element is arranged between the inner layer side heat insulation component and the outer layer side heat insulation component; the sheet provides a step portion on a side of the inner layer portion closer to the object; and the thermocouple is arranged on a side of the step portion closer to the object.

[0013] According to the present invention, the step portion (a portion that is partially raised inward relative to its peripheral region) is provided to help the thermocouple to directly contact the surface of the object stably, thereby achieving higher-precision temperature measurement.

[0014] At least at the time of filing this application, the thermocouple is not exposed, that is, a thin film, a lining, etc. (for example, made of fluororesin, polyimide resin or aromatic polyamide resin, with an upper limit of thickness of about 0.5 mm) is provided on the object side of the thermocouple, and the method of interposing these films, linings, etc. between the thermocouple and the object is not excluded. However, if at least a part of the thermocouple is exposed on the side of the step portion closer to the object, it is helpful for the thermocouple to directly contact the object, so this is preferred.

[0015] In one aspect of the present invention, the sheet is partially provided as a sheet lining on a side of the inner layer portion closer to the object, thereby providing the step portion.

[0016] According to this aspect of the present invention, the locally provided sheet lining helps to bring the thermocouple into direct contact with the surface of the object in a stable manner, thereby enabling higher-precision temperature measurement.

[0017] According to various experiments conducted by the inventors of the present application, the sheet lining is preferably made of a material having elasticity that can softly press the thermocouple against the surface of the object. Specifically, the sheet lining is preferably made of fluororesin, polyimide resin, or aromatic polyamide resin. It has been confirmed that even if such a sheet lining is locally provided, it will not have a significant effect on the temperature uniformity of the entire object. In addition, when such a sheet lining is used, it has heat insulation properties and a small heat storage coefficient, so it also has the advantage of being able to effectively eliminate the direct influence from the heating element in the temperature measurement using the thermocouple.

[0018] When the thermocouple is exposed on the sheet lining, the area of ​​the sheet lining (projected area from the inside) is preferably 5 to 400 times the exposed area of ​​the thermocouple (projected area from the inside). As long as it is within this range, the thermocouple can be in direct contact with the surface of the object stably without significantly affecting the temperature uniformity of the entire object.

[0019] Specifically, it has been confirmed that when the area of ​​the sheet backing is 10 cm×10 cm, the effect of the present invention can be obtained if the area of ​​the thermocouple exposed is 1 / 400 to 1 / 87 times that (the area of ​​the sheet backing is 87 to 400 times the area of ​​the thermocouple exposed on the sheet backing). Furthermore, it has been confirmed that when the area of ​​the sheet backing is 3 cm×2 cm, the effect of the present invention can be obtained if the area of ​​the thermocouple exposed is 1 / 24 to 1 / 5 times that (the area of ​​the sheet backing is 5 to 24 times the area of ​​the thermocouple exposed on the sheet backing).

[0020] For example, the sheet lining has a thickness of 0.1 mm to 5.0 mm. Also, for example, the sheet lining has a rectangular shape with one side being less than 1 / 2 times the outer circumference of the pipe, or a rectangular shape with one side being less than 10 cm. Alternatively, for example, the sheet lining has a circular shape or a ring shape with a diameter less than 1 / 2 times the outer circumference of the pipe, or a circular shape or a ring shape with a diameter less than 10 cm.

[0021] In addition, the technical concept of partially providing a sheet lining may be replaced by partially protruding a portion of the sheet extending as a whole relative to the object, i.e., a sheet lining portion. That is, in another embodiment of the present invention, a portion of the sheet as the sheet lining portion partially protrudes on a side closer to the object, thereby providing the step portion.

[0022] According to this aspect of the present invention, the partial provision of the sheet lining portion helps to bring the thermocouple into direct contact with the surface of the object in a stable manner, thereby enabling higher-precision temperature measurement.

[0023] According to various experiments conducted by the inventors of the present application, it is preferred that the sheet lining portion (the sheet including the sheet lining portion) is made of a material having elasticity that can softly press the thermocouple against the surface of the object. Specifically, it is preferred that the sheet including the sheet lining portion is made of fluororesin, polyimide resin or aromatic polyamide resin. It has been confirmed that even if such a sheet lining portion (the sheet including the sheet lining portion) is provided, it will not have a significant effect on the temperature uniformity of the entire object. Furthermore, when such a sheet lining portion is used, it has heat insulation properties and a small heat storage coefficient, and therefore has the advantage of being able to effectively eliminate the direct influence from the heating element in the temperature measurement using the thermocouple.

[0024] When the thermocouple is exposed on the sheet lining portion, the area of ​​the sheet lining portion (projected area from the inside) is preferably 5 to 400 times the exposed area of ​​the thermocouple (projected area from the inside). As long as it is within this range, the thermocouple can be in direct contact with the surface of the object stably without significantly affecting the temperature uniformity of the entire object.

[0025] Specifically, it has been confirmed that when the area of ​​the sheet lining portion is 10 cm×10 cm, if the area of ​​the thermocouple exposed is 1 / 400 to 1 / 87 times that, the effect of the present invention can be obtained (the area of ​​the sheet lining portion is 87 to 400 times the area of ​​the thermocouple exposed on the sheet lining portion). In addition, it has been confirmed that when the area of ​​the sheet lining portion is 3 cm×2 cm, if the area of ​​the thermocouple exposed is 1 / 24 to 1 / 5 times that, the effect of the present invention can be obtained (the area of ​​the sheet lining portion is 5 to 24 times the area of ​​the thermocouple exposed on the sheet lining portion).

[0026] For example, the sheet material excluding the sheet lining portion has a thickness of 0.1 mm to 5.0 mm. The sheet lining portion has a thickness of 0.1 mm to 5.0 mm on the sheet material. In addition, for example, the sheet lining portion has a rectangular shape with one side being less than 1 / 2 times the outer circumference of the pipe, or a rectangular shape with one side being less than 10 cm. Alternatively, for example, the sheet lining portion has a circular shape or annular shape with a diameter less than 1 / 2 times the outer circumference of the pipe, or a circular shape or annular shape with a diameter less than 10 cm.

[0027] In each of the above-mentioned covering bodies, it is preferable that the heating element and the thermocouple are arranged so as not to overlap each other when viewed in the thickness direction from the inner layer portion to the outer layer portion.

[0028] In this case, in the temperature measurement by the thermocouple, the direct influence from the heating element can be eliminated more effectively.

[0029] In addition, the present invention provides a heat generating structure having an object and a covering body, wherein the object is a straight pipe, a bent pipe, a flexible pipe or a valve box; and the covering body has any one of the above-mentioned characteristics. [Effects of the invention]

[0030] According to the present invention, providing the step portion helps to directly contact the thermocouple with the surface of the object stably, thereby achieving higher-precision temperature measurement.

[0031] In particular, according to one aspect of the present invention, the locally provided sheet liner helps to bring the thermocouple into direct contact with the surface of the object in a stable manner, thereby enabling higher-precision temperature measurement.

[0032] Alternatively, according to another aspect of the present invention, the sheet lining portion partially protruding from the sheet helps to bring the thermocouple into direct contact with the surface of the object in a stable manner, thereby enabling temperature measurement with higher accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic perspective view of a covering body according to one embodiment of the present invention. Figure 2 yes Figure 1 A schematic cross-sectional view of a covering body. Figure 3 is a photo of another type of thermocouple. Figure 4 is a photo of another type of thermocouple. Figure 5 is a photo of another type of thermocouple. Figure 6 It is a perspective view showing a specific example of the valve box. Figure 7 It is a front view showing a specific example of the valve box. Figure 8 This is a schematic longitudinal sectional view showing an example of a sheet liner of a type having a non-constant thickness. Fig. 9 This is a schematic longitudinal sectional view showing another example of a sheet liner of a type having a non-constant thickness. Fig.10 This is a schematic longitudinal sectional view showing another example of a sheet liner of a type having a non-constant thickness. Fig.11 This is a schematic longitudinal sectional view showing another example of a sheet liner of a type having a non-constant thickness. Fig.12 This is a schematic longitudinal sectional view showing another example of a sheet liner of a type having a non-constant thickness. Fig.13 This is a schematic longitudinal sectional view showing another example of a sheet liner of a type having a non-constant thickness. Fig.14 This is a schematic perspective view of a covering body according to another embodiment of the present invention. Fig.15 yes Fig.14 A schematic cross-sectional view of a covering body. Fig.16 is another example of a sheet lining portion, and Fig.15 に is a schematic cross-sectional view corresponding to the embodiment of the present invention. Fig.17 is another example of a sheet lining portion, and Fig.15 Corresponding schematic cross-sectional view. Fig.18 is another example of a sheet lining portion, and Fig.15Corresponding schematic cross-sectional view. Fig.19 is another example of a sheet lining portion, and Fig.15 Corresponding schematic cross-sectional view. Fig. 20 is another example of a sheet lining portion, and Fig.15 Corresponding schematic cross-sectional view. Fig.21 It is a schematic cross-sectional view of a covering body in the prior art. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0035] (One embodiment) The coating 1 of one embodiment of the present invention is a coating that can heat a straight pipe (an example of an object) for supplying or exhausting gas to a desired temperature and keep it warm. The coating 1 (on the inner side) is pre-designed and manufactured according to the appearance of the straight pipe.

[0036] (Structure of the Encapsulated Body 1) like Figure 1 and Figure 2 As shown, the covering body 1 of this embodiment has an inner layer 11 and an outer layer 12, wherein the inner layer 11 is composed of two layers of laminated glass cloth, glass cloth coated with fluororesin, fluororesin porous sheet, or aromatic polyamide fiber cloth layer; and the outer layer 12 is composed of glass cloth coated with fluororesin, glass cloth coated with silicone resin, fluororesin porous sheet, or aromatic polyamide fiber cloth layer. The inner layer 11 is arranged on the side close to the pipe, and the outer layer 12 is arranged on the side away from the pipe.

[0037] The covering body 1 has a predetermined thickness (about 20 mm in this example), and the inner layer 11 and the outer layer 12 are connected at the side ends by the side layer 13. The side layer 13 is also composed of a glass cloth layer coated with fluororesin, similarly to the outer layer 12.

[0038] like Figure 2 As shown, an inner layer side heat insulating component 21 is arranged on the outer side (outer layer 12 side) of the inner layer part 11. The inner layer side heat insulating component 21 supports a heating element 23 composed of a heating wire on the inner layer side. An outer layer side heat insulating component 22 is arranged on the outer side (outer layer 12 side) of the heating element 23.

[0039] The inner heat-insulating component 21 is made of silica fiber cloth, the heating element 23 is made of nickel-chromium heating wire and is sewn on the inner heat-insulating component 21 by glass fibers coated with fluororesin, and the outer heat-insulating component 22 is made of glass felt.

[0040] Furthermore, in the sheath 1 of the present embodiment, sheet linings 31 are provided at two locations as sheets for providing stepped portions on the inner side (pipe side) of the inner layer portion 11 (the sheet linings 31 may be provided at one location or at three or more locations by sewing with thread or bonding). The sheet linings 31 of the present embodiment are each made of fluororesin, have appropriate elasticity, and have a rectangular shape of 3 cm×2 cm (an area of ​​6 cm). 2 ), the thickness is 1.0mm.

[0041] Furthermore, the thermocouple 32 is exposed at a position further inside (on the piping side) each of the sheet linings 31. The thermocouple 32 of this embodiment is a "sheath straight" type with a diameter of 1 mm, and the entire portion of the length of 2.0 cm is exposed. The thermocouple 32 is sewed or bonded to the sheet lining 31 with a thread.

[0042] That is, the area of ​​the thermocouple 32 exposed on the sheet substrate 31 (projected area from the inside) is 0.25 cm 2 According to this, the area of ​​the sheet liner 31 (the projected area from the inside) is 24 times the area of ​​the thermocouple 32 exposed on the sheet liner 31 (the projected area from the inside).

[0043] The base end side of the thermocouple 32 can be connected to a control unit (e.g., a thermostat) not shown in the figure via a wire (not shown) penetrating the sheath 1 (sheet lining 31, inner layer 11, inner layer side heat insulating component 21, outer layer side heat insulating component 22, and outer layer 12). The control unit can also be connected to the heating element 23 via a wire penetrating the outer layer 12 and the outer layer side heat insulating component 22. In addition, the control unit controls the energization of the heating element 23 based on the temperature measurement value measured by the thermocouple 32.

[0044] In addition, in the covering body 1 of the present embodiment, a fastening portion 14 is provided on the outer surface portion of the outer layer portion 12, and the fixing part of the fastening portion 14 and the fixing part of the outer layer portion 12 are fastened together by a hook, a belt, a Velcro, a rope or a fluororubber ring, whereby the covering body 1 is fixed to the piping serving as the object.

[0045] (Function of the coating body 1) As described above, the (inner layer side) pattern of the coating 1 is designed and manufactured in advance according to the appearance pattern of the pipe as the object. And the coating 1 is fixed to the pipe as the object by fastening the fixing member of the fastening part 14 and the fixing member of the outer layer part 12.

[0046] During this fixing, in the covering body 1 of the present embodiment, the thermocouple 32 is exposed on the pipe side. However, since the sheet lining 31 has elasticity to softly press the thermocouple 32 against the pipe surface, the thermocouple 32 can be brought into direct contact with the pipe surface in a stable manner.

[0047] Here, since the sheet lining 31 is provided only partially in correspondence with the installation position of the thermocouple 32 , it was confirmed that there is no significant adverse effect on the temperature uniformity of the entire pipe.

[0048] According to the covering body 1 of the present embodiment as described above, the locally provided sheet lining 31 helps the thermocouple 32 to be in direct contact with the pipe surface in a stable manner, thereby achieving higher-precision temperature measurement.

[0049] The thermocouple 32 is connected to a control unit (eg, a thermostat) (not shown) that controls energization of the heating element 23 based on the temperature measurement value measured by the thermocouple 32. This allows energization of the heating element 23 to be controlled with higher accuracy.

[0050] Here, according to the covering body 1 of the present embodiment, since the sheet lining 31 has heat insulation and a small heat storage coefficient, it also has the advantage of being able to effectively eliminate the direct influence from the heating element 23 during the temperature measurement using the thermocouple 32. In addition, when viewed in the thickness direction from the inner layer portion 11 to the outer layer portion 12, if the heating element 23 and the exposed portion of the thermocouple 32 are arranged in a non-overlapping manner, it is more effective in eliminating the direct influence from the heating element 23.

[0051] (Modification of Sheet Liner) In the above embodiment, the sheet lining 31 is a rectangular shape of 3 cm×2 cm, and the area of ​​the sheet lining 31 is 24 times the area of ​​the thermocouple 32 exposed on the sheet lining 31, but it is not limited to this. The inventors of the present application have confirmed that when the area of ​​the sheet lining is 3 cm×2 cm, if the area of ​​the thermocouple exposed is 1 / 24 to 1 / 5 times (the area of ​​the sheet lining is 5 to 24 times the area of ​​the thermocouple exposed on the sheet lining), the effect of the present invention can be obtained.

[0052] In addition, when the sheet lining 31 is a rectangular shape of 10 cm×10 cm, the inventors of the present application have confirmed that the effect of the present invention can be obtained if the area of ​​the exposed thermocouple is 1 / 400 to 1 / 87 times of it (the area of ​​the sheet lining is 87 to 400 times the area of ​​the thermocouple exposed on the sheet lining).

[0053] Furthermore, the sheet lining 31 may be a rectangular shape of other sizes, for example, as long as it is a rectangular shape with a side of less than 10 cm, the effect of the present invention can be obtained. In terms of the relationship with the outer circumference of the pipe, if the sheet lining 31 is a rectangular shape with a side less than 1 / 2 times (preferably less than 1 / 4 times) the outer circumference of the pipe, the effect of the present invention can be obtained (the thermocouple 32 can be softly pressed against the pipe surface, and the thermocouple 32 can be stably directly contacted with the pipe surface).

[0054] Alternatively, the sheet lining 31 is not limited to a rectangular shape, and may have various shapes. For example, the sheet lining 31 may be circular, elliptical, or ring-shaped. In the case of a ring shape, the area of ​​the center hole may overlap with the thermocouple 32. In the case where the sheet lining 31 is circular, elliptical, or ring-shaped, as long as its diameter, twice the radius of the major axis, or the outer diameter is less than 10 cm, the effect of the present invention can be expected. In terms of the relationship with the outer periphery of the piping, as long as the diameter, twice the radius of the major axis, or the outer diameter of the sheet lining 31 is less than 1 / 2 times (preferably less than 1 / 4 times) the outer periphery of the piping, the effect of the present invention can be obtained (the thermocouple 32 can be softly pressed against the piping surface, and the thermocouple 32 can be stably in direct contact with the piping surface).

[0055] In addition, the effect of the present invention can be expected as long as the thickness of the sheet lining 31 is 0.1 mm to 5.0 mm. (If the thickness of the sheet lining 31 exceeds 5.0 mm, the distance between the heating element 32 and the pipe surface at that location is too large, and the end surface of the sheet lining 31 becomes an excessively large step, leaving a gap between the covering body 1 and the pipe surface, which can hinder efficient and uniform heating of the pipe.)

[0056] (Modification of thermocouple) In addition, the present invention is not limited to the "armored straight" type of thermocouple 32, and other types of thermocouples may also be used. For example, Figure 3 This is a photo of a thermocouple of the "end plate on top" type. Figure 4 This is a photo of a "top block" type thermocouple. Figure 5 This is a photograph of a thermocouple of the type "with an O-shaped terminal at the tip". The present invention can be used arbitrarily with these types of thermocouples (especially thermocouples of the type with an indescribable shape that is easy to follow the plane shape of an object).

[0057] (Overall style variation) In addition, in the above embodiment, the overall style of the covering body 1 is designed and manufactured for a straight pipe, but it is not limited to this. The overall style of the covering body 1 can also be designed and manufactured for a pipe having a straight pipe portion and a curved portion. In addition, the overall style of the covering body 1 can also be designed and manufactured for an object having a complex shape such as a valve box (a box that accommodates a valve unit). Figure 6 and Figure 7 A specific structural example of the valve box 40 is shown in FIG. Figure 6 and Figure 7 According to the prior patent filed by the applicant of the present invention (Japanese Patent Grant No. 6596025) Fig.10 and Fig.11 ).

[0058] Furthermore, the entire heat generating structure including an object (for example, a straight pipe, a bent pipe, a flexible pipe, or a valve box) and a covering body 1 covering the object is also an object of the present invention.

[0059] (Thickness of sheet lining) If the thickness of the sheet lining 31 increases, the effect of pressing the thermocouple 32 becomes greater. On the other hand, if the thickness is too thick, the heating of the sheet lining 31 may be insufficient, resulting in uneven temperature. Therefore, it is desirable to appropriately select the thickness of the sheet lining 31 according to the type and size of the object and the package 1, and the type and size of the thermocouple 32.

[0060] In addition, in the above embodiment and each modification, it is assumed that the thickness of the sheet lining 31 is constant or substantially constant over the entire range of the sheet lining 31. However, the present invention is not limited to such a form.

[0061] For example, the area of ​​the sheet lining 31 located at the tip side of the thermocouple 32 is made thicker than the area of ​​the sheet lining 31 located at the root side of the thermocouple 32, thereby making the action of pressing the tip side of the thermocouple 32 against the object more reliable. When the distance between the thermocouple 32 and the object is reduced by this action, the influence of thermal noise directly transmitted from the heating element 23 composed of the heating wire to the thermocouple 32 can be suppressed.

[0062] As a specific method for making the region of the sheet lining 31 located on the tip side of the thermocouple 32 thicker than the region of the sheet lining 31 located on the root side of the thermocouple 32 , various methods are conceivable. Figures 8 to 13 Each of them is a schematic longitudinal sectional view showing an example of a sheet liner 31 of a type having a non-constant thickness.

[0063] Figure 8 This means that the tip side of the sheet liner 31 located at the thermocouple 32 ( Figure 8 A schematic longitudinal sectional view of an example of a type of bending in the area (on the right side in FIG. ). Figure 8 (a) shows the state before being installed on the covering body 1, Figure 8 (b) shows the state after being installed on the covering body 1. Figure 8 In (b), the illustration of the covering body 1 is omitted, but the upper surface side of the sheet liner 31 is attached to the covering body 1 by bonding or the like. From the viewpoint of manufacturability, the number of folds is preferably 2 or less (overlapping to 3 or less) (because it is not easy to fold more than 3 times).

[0064] like Figure 8 As shown, the area of ​​the sheet lining 31 located on the top side of the thermocouple 32 is bent toward the side opposite to the thermocouple 32, thereby significantly suppressing the possibility of unexpected "hooking" between the thermocouple 32 and the sheet lining 31, thereby causing unexpected deformation or even damage.

[0065] Fig. 9 This means that the tip side of the sheet liner 31 located at the thermocouple 32 ( Fig. 9 A schematic longitudinal cross-sectional view of an example of a type in which two layers overlap in the area (on the right side of the figure). Fig. 9 (a) shows the state before being installed on the covering body 1, Fig. 9 (b) shows the state after being installed in the covering body 1. Fig. 9 In (b), the cover 1 is omitted, but the upper surface of the sheet liner 31 is attached to the cover 1 by bonding or the like. From the viewpoint of manufacturability, the number of overlapped sheets is preferably 3 or less (because it is not easy to overlap 4 or more sheets).

[0066] like Fig. 9 As shown, the area of ​​the sheet lining 31 located on the top side of the thermocouple 32 is made into two layers on the side opposite to the thermocouple 32, thereby significantly suppressing the possibility of unexpected "hooking" between the thermocouple 32 and the sheet lining 31, thereby causing unexpected deformation or even damage.

[0067] Fig.10 The sheet liner 31 is located at the top end side of the thermocouple 32 ( Fig.10 The area on the right side of the sheet lining 31 is larger than the root side of the thermocouple 32 ( Fig.10 A schematic longitudinal cross-sectional view of an example of a type in which the sheet lining 31 is formed into a "wedge shape" as a whole so that the area (left side in the figure) is thick. The thermocouple 32 is provided on the inclined surface side of the wedge-shaped sheet lining 31.

[0068] like Fig.10 As shown, by forming the sheet lining 31 as a whole into a “wedge shape”, the possibility of the thermocouple 32 and the sheet lining 31 being undesirably “hooked” and thus causing undesirable deformation or even damage is significantly suppressed.

[0069] Fig.11 It also shows that the sheet liner 31 is located at the top end side of the thermocouple 32 ( Fig.11 The area on the right side of the sheet lining 31 is larger than the root side of the thermocouple 32 ( Fig.11 This is a schematic longitudinal sectional view of an example of a type in which the sheet lining 31 is formed as a whole into a "wedge shape" in such a way that the area (left side in the figure) is thick. Fig.11 (a) shows a state before being attached to the covering body 1 , and the thermocouple 32 is provided on the horizontal surface side of the wedge-shaped sheet liner 31 . Fig.11 (b) shows a state after being attached to the covering body 1. Although the covering body 1 is not shown in the figure, the upper surface side of the sheet liner 31 is attached to the covering body 1 by bonding or the like.

[0070] exist Fig.11 In the example shown, the possibility of the thermocouple 32 and the sheet liner 31 being undesirably “hooked” and thus being undesirably deformed or even damaged is also significantly suppressed.

[0071] Fig.12 The sheet liner 31 is located at the top end side of the thermocouple 32 ( Fig.10 The area on the right side of the sheet lining 31 is larger than the root side of the thermocouple 32 ( Fig.11 A schematic longitudinal cross-sectional view of an example of a type in which a portion of the sheet lining 31 is formed into a "wedge shape" so that the area (left side in FIG. 1 ) is thick. The thermocouple 32 is provided on the inclined surface side of the sheet lining 31 .

[0072] like Fig.12 As shown, by forming a portion of the sheet lining 31 into a “wedge shape”, the possibility of the thermocouple 32 and the sheet lining 31 being undesirably “hooked” and thus being undesirably deformed or even damaged is significantly suppressed.

[0073] Fig.13 It also shows that the sheet liner 31 is located at the top end side of the thermocouple 32 ( Fig.13 The area on the right side of the sheet lining 31 is larger than the root side of the thermocouple 32 ( Fig.13 A schematic longitudinal sectional view of an example of a type in which a portion of the sheet lining 31 is formed into a "wedge shape" in such a way that the area (left side in the figure) is thick. Fig.13 (a) shows a state before being mounted on the covering body 1 , and the thermocouple 32 is provided on the horizontal surface side of the sheet substrate 31 . Fig.13 (b) shows a state after being attached to the covering body 1. Although the covering body 1 is not shown in the figure, the upper surface side of the sheet liner 31 is attached to the covering body 1 by bonding or the like.

[0074] exist Fig.13In the example shown, the possibility of the thermocouple 32 and the sheet liner 31 being undesirably “hooked” and thus being undesirably deformed or even damaged is also significantly suppressed.

[0075] (Another embodiment) Furthermore, in the above-described embodiment, the sheet lining 31 is directly provided on the inner side (pipe side) of the inner layer portion 11 , but it is also within the scope of the present invention to interpose some intermediate layer therebetween.

[0076] Furthermore, the case where the intermediate layer is integrally connected to the sheet lining 31 (by sewing with thread or bonding, etc.) is also a structure within the scope of the present invention.

[0077] Furthermore, as a sheet material for providing a step portion, instead of partially disposing the sheet lining 31, a sheet material 130 in which the sheet lining portion 131 partially protrudes may be disposed on the inner side (pipe side) of the inner layer portion 11. Fig.14 and Fig.15 Such an embodiment is shown in FIG.

[0078] exist Fig.14 and Fig.15 In the embodiment shown, a sheet 130 having a sheet lining portion 131 partially protruding at two locations (or one or more than three locations) is arranged on the inner side (pipe side) of the inner layer portion 11. The sheet lining portion 131 is configured to provide a step portion (see Fig.15 ). The sheet 130 (including the sheet lining portion 131) of this embodiment is made of fluororesin and has appropriate elasticity. The thickness of the sheet 130 excluding the sheet lining portion 131 is 0.5 mm, and each sheet lining portion 131 has a rectangular shape of 3 cm × 2 cm (area 6 cm 2 ) and has a thickness of 1.0 mm (0.5 mm thicker than other parts of the sheet 130).

[0079] exist Fig.14 and Fig.15 In the embodiment shown, for Figure 1 and Figure 2 The same structures in the illustrated embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0080] exist Fig.14 and Fig.15 In the illustrated embodiment, the thermocouple 32 is also exposed on the pipe side. However, since the sheet lining portion 131 has elasticity to softly press the thermocouple 32 against the pipe surface, the thermocouple 32 can be brought into direct contact with the pipe surface in a stable manner.

[0081] Since the sheet lining portion 131 is only provided locally corresponding to the installation position of the thermocouple 32 , it was confirmed that there is no significant adverse effect on the temperature uniformity of the entire pipe.

[0082] according to Fig.14 and Fig.15 In the embodiment shown, the locally provided sheet lining portion 131 helps to bring the thermocouple 32 into direct contact with the pipe surface stably, thereby enabling temperature measurement with higher accuracy.

[0083] The thermocouple 32 is connected to a control unit (eg, a thermostat) (not shown) that controls energization of the heating element 23 based on the temperature measurement value measured by the thermocouple 32. This allows energization of the heating element 23 to be controlled with higher accuracy.

[0084] exist Fig.14 and Fig.15 In the illustrated embodiment, since the sheet lining portion 131 has heat insulation and a small heat storage coefficient, the direct influence from the heating element 23 can be effectively eliminated in the temperature measurement using the thermocouple 32. In addition, when viewed in the thickness direction from the inner layer portion 11 to the outer layer portion 12, if the heating element 23 and the exposed portion of the thermocouple 32 are arranged in a non-overlapping manner, it is more effective in eliminating the direct influence from the heating element 23.

[0085] (Modification of Sheet Lining Section) exist Fig.14 and Fig.15 In the embodiment shown, the sheet lining portion 131 is also in a rectangular shape of 3 cm×2 cm, and the area of ​​the sheet lining portion 131 is 24 times the area of ​​the thermocouple 32 exposed on the sheet lining portion 131, but the present invention is not limited thereto. The inventors of the present application have confirmed that when the area of ​​the sheet lining portion is 3 cm×2 cm, if the area of ​​the thermocouple exposed is 1 / 24 to 1 / 5 times that (the area of ​​the sheet lining portion is 5 to 24 times the area of ​​the thermocouple exposed on the sheet lining), the effect of the present invention can be obtained.

[0086] In addition, when the sheet lining portion 131 is a rectangular shape of 10 cm×10 cm, the inventor of the present application has confirmed that if the area of ​​the exposed thermocouple is 1 / 400 to 1 / 87 times of it (the area of ​​the sheet lining portion is 87 to 400 times the area of ​​the thermocouple exposed on the sheet lining portion), the effect of the present invention can be obtained.

[0087] Furthermore, the sheet lining portion 131 may be a rectangular shape of other sizes, for example, as long as it is a rectangular shape with a side of less than 10 cm, the effect of the present invention can be obtained. In terms of the relationship with the outer circumference of the pipe, if the sheet lining portion 131 is a rectangular shape with a side less than 1 / 2 times (preferably less than 1 / 4 times) the outer circumference of the pipe, the effect of the present invention can be obtained (the thermocouple 32 can be softly pressed against the pipe surface, and the thermocouple 32 can be stably directly contacted with the pipe surface).

[0088] Alternatively, the sheet lining portion 131 is not limited to a rectangular shape, and may have various shapes. For example, the sheet lining portion 131 may be circular, elliptical, or annular. In the case of an annular shape, the area of ​​the center hole may overlap with the thermocouple 32. In the case where the sheet lining portion 131 is circular, elliptical, or annular, as long as its diameter, twice the radius of the major axis, or the outer diameter is less than 10 cm, the effect of the present invention can be expected. In terms of the relationship with the outer periphery of the piping, as long as the diameter, twice the radius of the major axis, or the outer diameter of the sheet lining portion 131 is less than 1 / 2 times (preferably less than 1 / 4 times) the outer periphery of the piping, the effect of the present invention can be obtained (the thermocouple 32 can be softly pressed against the piping surface, and the thermocouple 32 can be stably in direct contact with the piping surface).

[0089] In addition, the effect of the present invention can be expected as long as the thickness of the sheet lining portion 131 is 0.1 mm to 5.0 mm. (If the thickness of the sheet lining portion 131 exceeds 5.0 mm, the distance between the heating element 32 at this position and the pipe surface is too large, and the end surface of the sheet lining portion 131 becomes an excessively large step, leaving a gap between the covering body 1 and the pipe surface, which can hinder efficient and uniform heating of the pipe.)

[0090] In addition, you can also Fig.16 As shown in the sheet lining portion 131 ′, the peripheral edge portion thereof is gently inclined.

[0091] In addition, you can also Fig.17 As shown in the sheet lining portion 231, a volume increasing element (step forming element) 211 is provided on the inner side (piping side) of the inner layer portion 11, and then a sheet 130 having a constant or substantially constant thickness as a whole is arranged, thereby providing a step portion.

[0092] In addition, you can also Fig.18 As shown in the sheet lining portion 231', a volume increase portion (step forming portion) 11' is provided in advance on the inner side (pipe side) of the inner layer portion 11, and a sheet 130 having a constant or substantially constant thickness as a whole is arranged to provide a step portion.

[0093] In addition, you can also Fig.19 As shown in the sheet lining portion 231 ″, a portion of the sheet 130 is processed into a shape that protrudes inward (toward the piping) by using some molding technology or the like, thereby providing a step portion.

[0094] In addition, you can also Fig. 20 As in the sheet lining portion 331 shown in the figure, a portion of the sheet 130 is folded so as to have an S-shaped cross section, thereby providing a step portion. [Explanation of Reference Numerals]

[0095] 1: Encapsulation; 11: Inner layer; 11': Volume increase portion (step forming portion); 12: Outer layer; 13: Side layer; 14: Fastening portion; 21: Inner layer side insulation component; 22: Outer layer side insulation component; 23: Heating element; 31: Sheet lining; 32: Thermocouple; 40: Valve box (box for accommodating valve unit); 110: Gas piping; 130: Sheet; 131: Sheet lining portion; 131': Sheet Lining portion; 211: volume increasing element (step forming element); 231: sheet lining portion; 231': sheet lining portion; 231": sheet lining portion; 331: sheet lining portion; 400: metal sheet; 500: outer layer portion; 510: inner layer portion; 520: heat insulating portion; 530: heating element; 540: heat insulating component; 555: temperature detecting portion; 560: thermal switch; 600: heat insulating component.

Claims

1. A coating body for coating an object, characterized in that: The invention comprises an inner layer part, an outer layer part, an inner layer side heat insulating component, an outer layer side heat insulating component, a heating element, a sheet material and a thermocouple, wherein: The inner layer portion is arranged on a side close to the object; The outer layer portion is arranged on a side away from the object; The inner layer side heat insulating member is arranged on the outer layer portion side of the inner layer portion; The outer layer side heat insulating member is arranged on the inner layer portion side of the outer layer portion; The heating element is arranged between the inner-layer-side heat-insulating component and the outer-layer-side heat-insulating component; The sheet material provides a step portion on a side of the inner layer portion closer to the object; The thermocouple is provided on a side of the step portion closer to the object.

2. The covering body according to claim 1, characterized in that: At least a portion of the thermocouple is exposed on a side of the step portion closer to the object.

3. The covering body according to claim 1 or 2, characterized in that: The sheet is partially provided as a sheet lining on a side of the inner layer portion closer to the object, thereby providing the step portion.

4. The covering body according to claim 3, characterized in that: The sheet liner is made of fluororesin, polyimide resin or aromatic polyamide resin.

5. The covering body according to claim 3 or 4, characterized in that: At least a portion of the thermocouple is exposed on a side of the step portion closer to the object, The area of ​​the sheet lining is 5 to 400 times the area of ​​the thermocouple exposed on the sheet lining.

6. The covering body according to any one of claims 3 to 5, characterized in that: The sheet liner has a thickness of 0.1 mm to 5.0 mm.

7. The covering body according to any one of claims 3 to 6, characterized in that: The sheet lining has a rectangular shape with one side being less than 1 / 2 times the outer circumference of the pipe.

8. The covering body according to any one of claims 3 to 6, characterized in that: The sheet lining has a circular shape or a ring shape having a diameter that is not more than 1 / 2 times the outer circumference of the pipe.

9. The covering body according to claim 1 or 2, characterized in that: The step portion is provided by partially protruding a portion of the sheet as a sheet lining portion on a side closer to the object.

10. The covering body according to claim 9, characterized in that: The sheet material is made of fluororesin, polyimide resin or aromatic polyamide resin.

11. The covering body according to claim 9 or 10, characterized in that: At least a portion of the thermocouple is exposed on a side of the step portion closer to the object, The area of ​​the sheet lining portion is 5 to 400 times the area of ​​the thermocouple exposed on the sheet lining portion.

12. The covering body according to any one of claims 9 to 11, characterized in that: The sheet lining portion has a thickness of 0.1 mm to 5.0 mm.

13. The covering body according to any one of claims 9 to 12, characterized in that: The sheet lining portion has a rectangular shape with one side being less than 1 / 2 times the outer circumference of the pipe.

14. The covering body according to any one of claims 9 to 13, characterized in that: The sheet lining portion has a circular shape or a ring shape having a diameter that is not more than 1 / 2 times the outer circumference of the pipe.

15. The covering body according to any one of claims 1 to 14, characterized in that: The heating element and the thermocouple are arranged so as not to overlap each other when viewed in the thickness direction from the inner layer portion to the outer layer portion.

16. A heat generating structure, characterized in that: A device comprising an object and the covering body according to any one of claims 1 to 15, wherein the object is a straight pipe, a bent pipe, a flexible pipe or a valve box; and the covering body is used to cover the object.

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