JP6271282B2 - Insulation sleeve - Google Patents

Description

  The present invention relates to a heat insulating sleeve, and more particularly to a heat insulating sleeve used for covering a high-temperature pipe through which a high-temperature fluid flows.

  Conventionally, a heat insulating sleeve suitable for high-temperature piping has been proposed (see, for example, JP-A-11-311396 (Patent Document 1)). Patent Document 1 discloses a configuration in which an end portion of a heat insulating sleeve made of a tubular braided body braided with inorganic fibers such as glass fibers is folded inside the sleeve.

JP 11-311396 A

  A pipe attached to a device that generates vibration, such as an internal combustion engine mounted on an automobile, vibrates together with the device. Due to the vibration of the pipe, the heat insulating sleeve covering the pipe slides with respect to the pipe, and as a result, there is a problem that the heat insulating sleeve is damaged such as fraying and tearing.

  This invention is made | formed in view of said subject, The main objective is to provide the heat insulation sleeve which can suppress generation | occurrence | production of damage.

  The heat insulation sleeve according to the present invention is a heat insulation sleeve for covering a high-temperature pipe, and includes a cylindrical first sleeve portion and a cylindrical second sleeve portion. The first sleeve portion has a first end and a second end opposite to the first end. The second sleeve portion is configured as a member different from the first sleeve portion. The second sleeve portion covers the inner peripheral surface at the first end of the first sleeve portion and does not cover the inner peripheral surface at the second end.

  Preferably, in the heat insulating sleeve, the second sleeve portion extends from the first end to the outside of the first sleeve portion.

  Preferably, in the heat insulating sleeve, the second sleeve portion is unconstrained in the circumferential direction outside the first sleeve portion.

  Preferably, in the heat insulating sleeve, the high-temperature pipe has a first pipe and a protruding portion that protrudes radially outward with respect to the first pipe. The first sleeve portion covers the outer peripheral surface of the first pipe. The second sleeve portion covers the outer peripheral surface of the protruding portion.

  Preferably, in the heat insulating sleeve, the high-temperature pipe further includes a second pipe connected to the first pipe. The projecting portion is provided at a position connecting the first pipe and the second pipe.

  In the heat insulating sleeve, preferably, the first pipe and the second pipe are welded to each other, and the protrusion is a weld bead.

  In the heat insulating sleeve, preferably, the first sleeve portion and the second sleeve portion are made of different materials.

  In the heat insulating sleeve, preferably, the second sleeve portion is fixed to the inner peripheral surface of the first sleeve portion.

  Preferably, in the heat insulating sleeve, the second sleeve portion is sewn to the inner peripheral surface of the first sleeve portion.

  According to the heat insulating sleeve of the present invention, since the occurrence of damage can be suppressed, durability can be improved and a long life can be realized.

2 is a schematic cross-sectional view illustrating an outline of a configuration of a heat insulating sleeve according to Embodiment 1. FIG. It is sectional drawing which shows the structure of the 1st sleeve part shown in FIG. 6 is a schematic cross-sectional view illustrating a configuration of a heat insulating sleeve according to Embodiment 2. FIG. 6 is a schematic cross-sectional view illustrating a configuration of a heat insulating sleeve according to Embodiment 3. FIG. It is a cross-sectional schematic diagram which shows the structure of the heat insulation sleeve of a modification.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic cross-sectional view illustrating the outline of the configuration of the heat insulating sleeve 1 according to the first embodiment. FIG. 2 is a cross-sectional view showing a configuration of the first sleeve portion 10 shown in FIG. The heat insulating sleeve 1 shown in FIG. 1 is used to cover the high temperature pipe 100. The high-temperature pipe 100 is a pipe in which the pipe itself is at a high temperature due to a high-temperature fluid flowing inside. The high temperature pipe 100 is, for example, an exhaust pipe through which high temperature exhaust gas discharged from the engine flows.

  In the cross-sectional view shown in FIG. 1, the heat insulating sleeve 1 and the high temperature pipe 100 have a symmetrical shape with respect to a center line CL indicated by a one-dot chain line in the drawing. Therefore, in FIG. 1, the cross section of the heat insulation sleeve 1 and the high temperature piping 100 of only one direction with respect to the centerline CL is shown. In the cross-sectional view shown in FIG. 2, the first sleeve portion 10 has a symmetrical shape with respect to the center line CL indicated by a one-dot chain line in the drawing. Therefore, in FIG. 2, the cross section of the 1st sleeve part 10 of only one direction with respect to the centerline CL is shown in figure.

  The high-temperature pipe 100 has a first pipe 110 and a second pipe connected to the first pipe 110. The first pipe 110 has an outer peripheral surface 113 and an inner peripheral surface 114. The first pipe 110 and the second pipe 120 are welded and joined to each other.

  A weld bead 130 in which welding marks are formed in a band shape is formed at a position connecting the first pipe 110 and the second pipe 120. The weld bead 130 protrudes radially outward with respect to the outer peripheral surface 113 of the first pipe 110. A protruding portion 131 that protrudes radially outward with respect to the first pipe 110 is provided at a welded portion between the first pipe 110 and the second pipe 120. The protrusion 131 is a part of the weld bead 130 that is farther from the center line CL than the outer peripheral surface 113 of the first pipe 110.

The heat insulating sleeve 1 is formed of a tubular braided body in which inorganic fibers mainly composed of silicon dioxide (SiO ₂ ), alumina (Al ₂ O ₃ ), and the like, which are represented by E GLASS, are braided. The heat insulating sleeve 1 is attached to the outer periphery of the high temperature pipe 100 in order to prevent heat damage to peripheral parts of the high temperature pipe 100 or to keep the high temperature pipe 100 warm. The heat insulating sleeve 1 may be attached only at a position where there is a peripheral component to be prevented from heat damage in the extending direction of the high-temperature pipe 100. In this case, the heat insulating sleeve 1 can be minimized, so that the cost can be reduced.

  The heat insulating sleeve 1 includes a hollow cylindrical first sleeve portion 10. Referring to FIG. 2, the first sleeve portion 10 has a first end 11 that is one end portion and a second end 12 that is the other end portion opposite to the first end 11. . The tubular braid constituting the first sleeve portion 10 is folded back to form a double structure, and the first end 11 is formed by performing a sewing process 31. After the tubular braid is folded, the edge of the tubular braid is folded inward to form a four-layer structure, and the second end 12 is formed by performing a sewing process 34.

  The first sleeve portion 10 has an outer peripheral surface 13 and an inner peripheral surface 14. The inner peripheral surface 14 of the first sleeve portion 10 faces the outer peripheral surface 113 of the first pipe. The first sleeve portion 10 covers the outer peripheral surface 113 of the first pipe 110. The first sleeve portion 10 is a sleeve main body that covers the high-temperature pipe 100 in order to prevent heat damage to the peripheral parts that are the original purpose of the heat insulating sleeve 1 or to keep warm.

  The heat insulation sleeve 1 includes a hollow cylindrical second sleeve portion 20. The second sleeve portion 20 is configured as a member different from the first sleeve portion 10. The heat insulating sleeve 1 is composed of two members, a first sleeve portion 10 and a second sleeve portion 20. The second sleeve portion 20 has a first end 21 that is one end and a second end 22 that is the other end opposite to the first end 21. The second braided portion 20 is formed by folding the tubular braided body constituting the second sleeve portion 20 inward twice to form a four-layer structure and performing a sewing process 32 on the second end 22 side. ing.

  The second sleeve portion 20 has an outer peripheral surface 23 and an inner peripheral surface 24. The outer peripheral surface 23 of the second sleeve portion 20 faces the inner peripheral surface 14 of the first sleeve portion 10. The inner peripheral surface 24 of the second sleeve portion 20 faces the outer peripheral surface 113 of the first pipe 110 and the outer peripheral surface 133 of the protruding portion 131. The second sleeve portion 20 covers the outer peripheral surface 113 of the first pipe 110 and the outer peripheral surface 133 of the protruding portion 131. The second sleeve portion 20 covers the joint portion between the first pipe 110 and the second pipe 120 constituting the high temperature pipe 100 from the outer peripheral side.

  The first sleeve portion 10 and the second sleeve portion 20 are integrated by performing a sewing process 33 in the vicinity of the first end 11 of the first sleeve portion 10. The second sleeve portion 20 is fixed to the inner peripheral surface 14 of the first sleeve portion 10 by being sewn to the inner peripheral surface 14 of the first sleeve portion 10 with a sewing thread.

  The second sleeve portion 20 is provided only at the first end 11 of the first sleeve portion 10. At the first end 11 of the first sleeve portion 10, the second sleeve portion 20 is provided so as to cover only the inner peripheral surface 14 of the first sleeve portion 10, and covers the outer peripheral surface 13 of the first sleeve portion 10. Not. The second sleeve portion 20 is not provided at the second end 12 of the first sleeve portion 10. The second sleeve portion 20 does not cover the inner peripheral surface 14 at the second end 12 of the first sleeve portion 10.

  The length of the second sleeve portion 20 in the axial direction (left-right direction in FIG. 1) is smaller than the length of the first sleeve portion 10 in the axial direction. The second sleeve portion 20 only needs to have an axial length that can cover the inner peripheral surface 14 of the first end 11 of the first sleeve portion 10. You may prescribe | regulate a direction length to 1/4 or less of the axial direction length of the 1st sleeve part 10. FIG.

  The second sleeve portion 20 extends from the first end 11 of the first sleeve portion 10 to the outside of the first sleeve portion 10. The second end 22 of the second sleeve portion 20 is disposed inside the hollow space surrounded by the first sleeve portion 10. The first end 21 of the second sleeve portion 20 is disposed outside the hollow space surrounded by the first sleeve portion 10 and protrudes from the first end 11 of the first sleeve portion 10 to the outside. The first end 21 of the second sleeve portion 20 protrudes toward the outside of the first sleeve portion 10 with respect to the first end 11 of the first sleeve portion 10.

  In the vicinity of the second end 22, the second sleeve portion 20 is subjected to a sewing process 32 for configuring the second sleeve portion 20 in a four-layer structure. At an intermediate position between the first end 21 and the second end 22 of the second sleeve portion 20, a sewing process 33 for integrating the first sleeve portion 10 and the second sleeve portion 20 is performed. The sewing process is not performed in the vicinity of the first end 21 of the second sleeve portion 20. A portion of the second sleeve portion 20 existing outside the first sleeve portion 10 is not subjected to a sewing process.

  By performing the sewing process, the second sleeve portion 20 is prevented from being deformed to expand radially outward. In the vicinity of the first end 21 of the second sleeve portion 20 that has not been subjected to the sewing process, deformation that extends radially outward is allowed. When the second sleeve portion 20 is deformed so as to spread outward in the radial direction, the outer peripheral length of the second sleeve portion 20 increases. A portion of the second sleeve portion 20 that is present outside the first sleeve portion 10 and is not subjected to the sewing process is not restrained in the circumferential direction.

  By arranging the second end 22 subjected to the sewing process 33 inside the first sleeve portion 10 and disposing the first end 21 not subjected to the sewing process outside the first sleeve portion 10, The outer peripheral surface 133 of the projecting portion 131 of 100 is covered with a portion close to the first end 21 of the second sleeve portion 20. With such an arrangement of the second sleeve portion 20, the number of layers of the portion of the second sleeve portion 20 that covers the outer peripheral surface 133 of the protruding portion 131 is surely four.

Next, the effect of the heat insulation sleeve 1 of this Embodiment is demonstrated.
According to the present embodiment, as shown in FIG. 1, the heat insulating sleeve 1 includes a cylindrical first sleeve portion 10 having a first end 11 and a second end 12, and a first sleeve portion 10 different from the first sleeve portion 10. And a cylindrical second sleeve portion 20 configured as a member. The second sleeve portion 20 covers the inner peripheral surface 14 at the first end 11 of the first sleeve portion 10.

  One end portion of the heat insulating sleeve 1 is constituted by a structure in which two components are integrated, and the number of layers of the braided body constituting one end portion of the heat insulating sleeve 1 is increased. . Since the second sleeve portion 20 is disposed radially inward with respect to the first sleeve portion 10, when one end portion of the heat insulating sleeve 1 slides with respect to the high-temperature pipe 100, first, for example, fraying or breaking. It is the second sleeve portion 20 that is damaged. Therefore, occurrence of damage to the first sleeve portion 10 can be suppressed. As described above, the first sleeve portion 10 has a function as a sleeve body that covers the high-temperature pipe 100 in order to prevent thermal damage to the surrounding parts or to keep warm, and the first sleeve portion 10 is damaged. If not, the desired heat insulation performance of the heat insulation sleeve 1 can be ensured.

  Thereby, time until it damages to such an extent that the heat insulation performance as the whole heat insulation sleeve 1 falls can be extended, and durability of the heat insulation sleeve 1 can be improved. Therefore, it is possible to extend the life of the heat insulating sleeve 1. When the heat insulating sleeve 1 is used for the exhaust pipe of the engine, if the life of the heat insulating sleeve 1 becomes longer than that of the engine, the replacement work of only the heat insulating sleeve 1 can be made unnecessary. Maintenance frequency can be reduced.

  If the second sleeve portion 20 is formed in a multi-layer structure, the strength of the second sleeve portion 20 can be improved and the time until the second sleeve portion 20 is damaged is extended, so that the damage to the first sleeve portion 10 is more effective. Can be suppressed. If the total number of layers of the heat insulating sleeve 1 is increased, the effect of suppressing damage can be obtained in the same manner. However, since the heat insulating sleeve 1 becomes thick, an increase in weight, an increase in arrangement space, and an increase in cost occur. . By providing the second sleeve portion 20 that covers the inner peripheral surface 14 of only the first end 11 of the first sleeve portion 10 and does not cover the inner peripheral surface 14 of the second end 12 and has a small axial length, a heat insulating sleeve is provided. Therefore, it is possible to avoid the problem that the weight of 1 increases and it is easy to be damaged by its own weight at the time of vibration, and an inexpensive heat insulating sleeve 1 can be realized.

  The heat insulating sleeve 1 in which the first sleeve portion 10 and the second sleeve portion 20 are formed as separate members is easily manufactured as compared with the heat insulating sleeve in which the end portion of the tubular braid is folded to form a multi-layer structure. can do. The heat insulating sleeve 1 of the present embodiment can reduce the manufacturing cost as compared with a heat insulating sleeve having a multi-layer structure as a whole and a heat insulating sleeve having a multi-layer structure formed by folding back ends.

  Further, as in the present embodiment shown in FIG. 1, the second sleeve portion 20 extends from the first end 11 of the first sleeve portion 10 to the outside of the first sleeve portion 10. According to this configuration, only the second sleeve portion 20 is provided at the end portion of the heat insulating sleeve 1, and the first end 11 of the first sleeve portion 10 is separated from the end portion of the heat insulating sleeve 1. Therefore, the time until the first sleeve portion 10 slides and is damaged with respect to the high temperature pipe 100 can be made longer, and the durability of the heat insulating sleeve 1 can be further improved.

  Further, as in the present embodiment shown in FIG. 1, the second sleeve portion 20 is not restrained in the circumferential direction outside the first sleeve portion 10. Since the first end 21 of the second sleeve portion 20 is not constrained by the sewing thread, the relative movement of the second sleeve portion 20 with respect to the high temperature pipe 100 is allowed in a wider range. Therefore, even when the high temperature pipe 100 vibrates greatly, the second sleeve portion 20 can move following the high temperature pipe 100, and the relative vibration between the second sleeve portion 20 and the high temperature pipe 100 can be reduced. Therefore, it is possible to suppress the second sleeve portion 20 from sliding and being damaged with respect to the high temperature pipe 100, and the durability of the heat insulating sleeve 1 can be further improved.

  Further, as in the present embodiment shown in FIG. 1, the high-temperature pipe 100 includes a first pipe 110 and a protrusion 131 that protrudes radially outward with respect to the first pipe 110. The first sleeve portion 10 covers the outer peripheral surface 113 of the first pipe 110. The second sleeve portion 20 covers the outer peripheral surface 133 of the protruding portion 131. A portion of the heat insulating sleeve 1 that covers the protruding portion 131 that protrudes with respect to the first pipe 110 is most likely to be frayed or broken due to sliding with the high-temperature pipe 100. By providing the heat insulating sleeve 1 so that the second sleeve portion 20 covers the protruding portion 131, it is possible to lengthen the time until the first sleeve portion 10 slides and is damaged with respect to the high temperature pipe 100, and the first sleeve portion. 10 can be prevented from being damaged. Therefore, the durability of the heat insulating sleeve 1 can be improved.

  When the second sleeve portion 20 rides on and covers the protruding portion 131, the fray or tear generated in the second sleeve portion 20 is not easily seen from the outside. Thereby, the external appearance of the heat insulation sleeve 1 after long-time use can be improved.

  Further, as in the present embodiment illustrated in FIG. 1, the high-temperature pipe 100 further includes a second pipe 120 connected to the first pipe 110. The protrusion 131 is provided at a position connecting the first pipe 110 and the second pipe 120. In this way, the protruding portion 131 that protrudes from the first pipe at the position connecting the first pipe 110 and the second pipe 120 is covered with the second sleeve portion 20, so the heat insulating sleeve 1. And the appearance of the high-temperature pipe 100 including the heat insulating sleeve 1 can be improved.

  Further, as in the present embodiment shown in FIG. 1, the first pipe 110 and the second pipe 120 are welded to each other, and a part of the weld bead 130 constitutes the protruding portion 131. In this way, since the weld bead 130 formed by welding the first pipe 110 and the second pipe 120 is covered with the second sleeve portion 20, the durability of the heat insulating sleeve 1 can be improved. The appearance of the high-temperature pipe 100 including the heat insulating sleeve 1 can be improved.

  Further, as in the present embodiment shown in FIG. 1, the second sleeve portion 20 is fixed to the inner peripheral surface 14 of the first sleeve portion 10. In this way, the inner peripheral surface 14 of the first sleeve portion 10 facing the outer peripheral surface 113 of the high temperature pipe 100 is covered with the second sleeve portion 20, so that the first sleeve portion 10 is damaged. Generation | occurrence | production can be suppressed. Therefore, the durability of the heat insulating sleeve 1 can be improved. Since the sewing process 31 applied to the first sleeve portion 10 is covered with the second sleeve portion 20 and is not exposed to the outer peripheral surface 113 of the first pipe 110, the first sleeve portion It is possible to effectively suppress the tenth sewing thread from being cut and an increase in sag.

  Further, as in the present embodiment shown in FIG. 1, the second sleeve portion 20 is sewn to the inner peripheral surface 14 of the first sleeve portion 10. In this way, after forming the first sleeve portion 10 and the second sleeve portion 20 which is a member different from the first sleeve portion 10, the second sleeve portion 20 is formed into the first sleeve portion 10. The heat insulation sleeve 1 can be formed by sewing. Therefore, the heat insulation sleeve 1 of this Embodiment can be manufactured easily.

(Embodiment 2)
FIG. 3 is a schematic cross-sectional view showing the configuration of the heat insulating sleeve 1 of the second embodiment. The heat insulating sleeve 1 according to the second embodiment has substantially the same configuration as that of the first embodiment described above. However, the heat insulating sleeve 1 of the second embodiment is different from the first embodiment in that the first sleeve portion 10 and the second sleeve portion 20 are made of different materials. The first sleeve portion 10 of the second embodiment is a tubular braided body in which the same inorganic fibers as those of the first embodiment are braided. The second sleeve portion 20 of the second embodiment is formed by folding an annular metal mesh in the circumferential direction and then sewing it on the inner peripheral surface 14 of the first sleeve portion 10. One sleeve portion 10 is fixed.

  Since the first sleeve portion 10 and the second sleeve portion 20 are provided as separate members, the material of the second sleeve portion 20 can be freely selected, and the second sleeve portion 20 and the first sleeve portion 10 can be selected. It is easy to make different materials. Alternatively, the way of knitting the second sleeve portion 20 can be different from the way of knitting the first sleeve portion 10. Alternatively, the number of layers of the second sleeve portion 20 can be arbitrarily determined regardless of the number of layers of the first sleeve portion 10. The first sleeve part 10 and the second sleeve part 20 are made of different materials, or the configuration of the first sleeve part 10 and the second sleeve part 20 is changed, so that the optimum specifications in terms of strength and cost can be achieved. A second sleeve portion 20 can be provided.

(Embodiment 3)
FIG. 4 is a schematic cross-sectional view showing the configuration of the heat insulating sleeve 1 of the third embodiment. In the first and second embodiments, the second sleeve portion 20 is attached to the first end 11 of the first sleeve portion 10 shown in FIG. On the other hand, in Embodiment 3, the 2nd sleeve part 20 is attached to the 2nd end 12 of the 1st sleeve part 10 shown in FIG. The second sleeve portion 20 of the third embodiment is a belt-like braid formed by braiding heat-resistant inorganic fibers mainly composed of silicon dioxide (SiO ₂ ), alumina (Al ₂ O ₃ ), and the like represented by E GLASS. It is formed by a belt.

  As shown in FIG. 4, the first sleeve portion 10 has a bent portion 15 in which the edge portion of the braided body constituting the outer peripheral surface 13 is bent. The first sleeve portion 10 also has a bent portion 16 in which the edge portion of the braided body constituting the inner peripheral surface 14 is bent. The bent portions 15 and 16 are folded between the braided bodies constituting the outer peripheral surface 13 and the inner peripheral surface 14.

  The second sleeve portion 20 has an inner diameter portion 25 provided on the radially inner side and an outer diameter portion 26 provided on the radially outer side. The inner diameter portion 25 is disposed at a position relatively close to the center line CL shown in FIG. The outer diameter portion 26 is disposed at a position relatively far from the center line CL.

  The inner diameter portion 25 is disposed between the inner peripheral surface 14 of the first sleeve portion 10 and the outer peripheral surface 113 of the first pipe 110, and covers the inner peripheral surface 14 of the first sleeve portion 10 from the radially inner side. ing. The outer diameter portion 26 is folded into the first sleeve portion 10 from the second end 12 of the first sleeve portion 10. The outer diameter portion 26 is disposed between the bent portions 15 and 16 of the first sleeve portion 10 and is sandwiched between the bent portions 15 and 16. The second sleeve portion 20 is sewn to the first sleeve portion 10 by a sewing process 33.

  Since the first sleeve portion 10 and the second sleeve portion 20 can be integrated by the sewing process 33 by configuring the heat insulating sleeve 1 according to the third embodiment shown in FIG. 4, the heat insulating sleeve 1 is easily manufactured. It is possible to improve the appearance of the heat insulating sleeve 1. Since the second sleeve portion 20 covers the inner peripheral surface 14 at the second end 12 of the first sleeve portion 10, it is possible to suppress the damage of the first sleeve portion 10 and improve the durability of the heat insulating sleeve 1. Can be obtained as well.

  In the description of the first to third embodiments, examples in which the diameters of the first pipe 110 and the second pipe 120 are substantially the same have been described. The heat insulating sleeve 1 of the present invention can also be applied to an expansion / contraction pipe portion obtained by connecting pipes having different diameters.

  FIG. 5 is a schematic cross-sectional view showing a configuration of a heat insulating sleeve 1 according to a modification. In the modification shown in FIG. 5, the high temperature pipe 100 includes a first pipe 110 (small diameter pipe 111) on the left side in the figure, a first pipe 110 (large diameter pipe 112) on the right side in the figure, and a small diameter pipe 111. And a second pipe 120 that connects the large-diameter pipe 112. The small-diameter pipe 111 and the second pipe 120 are joined by welding, and the large-diameter pipe 112 and the second pipe 120 are joined by welding. The outer peripheral surface of the second pipe 120 expands in a tapered shape from the small diameter pipe 111 toward the large diameter pipe 112.

  In the expansion / contraction tube portion shown in FIG. 5, the first sleeve portion 10 covers the outer peripheral surface of the small-diameter pipe 111, and the second sleeve portion 20 covers the outer peripheral surface of the weld bead 130 that joins the small-diameter pipe 111 and the second pipe 120. The heat insulating sleeve 1 described in the first embodiment can be arranged so as to cover it. In addition, the first sleeve portion 10 covers the outer peripheral surface of the large-diameter pipe 112, and the second sleeve portion 20 covers the outer peripheral surface of the weld bead 130 that joins the large-diameter pipe 112 and the second pipe 120, The heat insulation sleeve 1 demonstrated in Embodiment 1 can be arrange | positioned. Thereby, the effect mentioned above which can suppress the damage of the 1st sleeve part 10 and can improve the durability of the heat insulation sleeve 1 can be acquired similarly.

  Although the embodiment of the present invention has been described as above, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied particularly advantageously to a heat insulating sleeve used to coat high temperature piping with high vibration.

  DESCRIPTION OF SYMBOLS 1 Heat insulation sleeve, 10 1st sleeve part, 11, 21 1st end, 12, 22 2nd end, 13, 23, 113, 133 outer peripheral surface, 14, 24, 114 inner peripheral surface, 15, 16 bending part, 20 Second sleeve portion, 25 inner diameter portion, 26 outer diameter portion, 31, 32, 33, 34 Sewing processing, 100 high temperature piping, 110 first piping, 111 small diameter piping, 112 large diameter piping, 120 second piping, 130 Weld bead, 131 protrusion, CL centerline.

Claims (7)

A heat insulation sleeve for covering high temperature pipes,
A first sleeve portion having a first end and a second end opposite to the first end, and formed by a tubular braided body in which inorganic fibers are braided ;
The second sleeve portion is configured as a member different from the first sleeve portion, and is fixed to the inner peripheral surface of the first sleeve portion, and includes a second sleeve portion having a shape in which a tubular braided body braided with inorganic fibers is folded .
The second sleeve portion, said first sleeve portion, not covering the said inner peripheral surface of the first end extends from the first end to the outside of the first sleeve portion, insulating sleeve. The second sleeve portion is integrated with the inner peripheral surface of the first sleeve portion by a sewing process, has a fold outside the first sleeve portion, and forms the second sleeve portion. The heat insulation sleeve according to claim 1 , wherein a sewing process is performed only inside the first sleeve portion . The high-temperature pipe has a first pipe and a protruding portion that protrudes radially outward with respect to the first pipe,
The first sleeve portion covers an outer peripheral surface of the first pipe,
The second sleeve portion covers the outer peripheral surface of the projecting portion, insulating sleeve according to claim 1 or 2. The high-temperature pipe further includes a second pipe connected to the first pipe,
The heat insulation sleeve according to claim 3 , wherein the protrusion is provided at a position connecting the first pipe and the second pipe. The first pipe and the second pipe are welded to each other,
The heat insulation sleeve according to claim 4 , wherein the protrusion is a weld bead. The heat insulation sleeve according to any one of claims 1 to 5 , wherein the first sleeve portion and the second sleeve portion are made of different materials. The heat insulation sleeve according to claim 2 , wherein the second sleeve portion has a plurality of the folds .

Images