Insulation material

Abstract

The objective is to provide a technology for efficiently forming elbow sections in ducts. [Solution] A thermal insulation member comprising a first thermal insulation material having substantially uniform thickness and a second thermal insulation material having substantially uniform thickness connected to the first thermal insulation material via a first V-shaped groove whose bottom corner is substantially perpendicular to the first thermal insulation material, wherein the first thermal insulation material has a first non-parallel end face which is substantially perpendicular to the surface of the thermal insulation material and whose normal is non-parallel and non-perpendicular to the extending direction of the first V-shaped groove, and the second thermal insulation material has a first inclined end face whose normal is non-parallel to the extending direction of the first V-shaped groove, and when the first thermal insulation material and the second thermal insulation material are arranged substantially perpendicular to each other by bending along the first V-shaped groove, the first non-parallel end face and the first inclined end face are in a common plane.

Description

[Technical Field]

[0001] The present invention relates to a heat insulating member that constitutes a duct installed for purposes such as air conditioning equipment of buildings. [Background Art]

[0002] In buildings, ducts, which are cylindrical passages, are widely used for circulating fresh air and various conditioned gases for air conditioning purposes, and for guiding gases inside the building to the outside of the building for exhaust, ventilation and other purposes. In addition to airtightness required to prevent circulating gas from leaking out of the duct, such ducts are also required to have heat insulating properties between the inner side and the outer side of the duct depending on the gas to be circulated, noise damping properties to suppress noise generated along with gas circulation, and impart non-combustibility, among other requirements.

[0003] In order to meet the above requirements, metal plates such as aluminum plates and iron plates, flame-retardant foamed synthetic rubber sheets, corrugated cardboard, etc. are selected and used as materials for forming ducts according to the gas to be circulated. For example, Patent Document 1 describes a technique for forming an air conditioning duct by forming a cylinder from a predetermined corrugated cardboard material.

[0004] Further, particularly in ducts through which cooled or heated gas circulates, heat insulating properties are imparted by attaching glass wool or foamed synthetic rubber sheets to the outer or inner surface of a duct formed of a metal plate, and condensation caused by temperature difference is prevented. For example, Patent Document 2 describes an air conditioning duct in which a mat-like fibrous heat insulating material is fixed to the outer circumferential surface and / or inner circumferential surface of the air conditioning duct with an adhesive or the like. In addition, Patent Document 3 describes an air conditioning duct configured by bonding a planar foamed rubber heat insulating material to each surface constituting a rectangular metal duct body. [Prior Art Documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-1095 [Patent Document 2] Japanese Patent Publication No. 2000-171085 [Patent Document 3] Japanese Patent Publication No. 2020-169752 [Overview of the project] [Problems that the invention aims to solve]

[0006] As described in the above-mentioned Patent Documents 2 and 3, by attaching various types of insulating materials to a duct body made of metal or the like, it is possible to provide the duct with the required airtightness, heat insulation, sound dampening, etc. Furthermore, for the straight sections of the duct, for example, as shown in Figure 3 of Patent Document 2, it is possible to attach insulating material without gaps relatively easily by "wrapping" a rectangular insulating material around them. On the other hand, when installing ducts as described in Patent Documents 1 and 2 within a building, it is essential to provide bends in the ducts according to the building structure, and it is common practice to provide a component called an elbow at such bends.

[0007] Figure 1 shows an example of an elbow member used when bending a duct with a rectangular cross-section, as described in Patent Documents 2 and 3, at a 90-degree angle. Elbow members for ducts are mainly provided based on the requirements of the building in which the duct is installed, and the angle of bending and the shape when bending vary. On the other hand, for reasons such as the fact that it is possible to form them by cutting the metal plate that makes up the duct in a straight line and bending it using sheet metal processing, it is common to connect parts of multiple duct members having a rectangular cross-section, as shown in Figure 1, and to apply a predetermined bending angle to the interface between them to form an elbow member as a whole. For example, for an elbow member with a 90-degree bend as a whole, Figure 1(a) shows an example in which parts of two duct members are connected, and Figure 1(b) shows an example in which parts of three duct members are connected.

[0008] Even in an elbow member 1 as shown in Figure 1, it is desirable to attach thermal insulation material to its surface to provide thermal insulation, sound dampening, etc. However, because the surface of the elbow member has a complex shape in which multiple planes intersect at predetermined angles, it is difficult to properly attach thermal insulation material by simply "wrapping" it in the manner described in Figure 3 of Patent Document 2. Generally, it is necessary to cut the thermal insulation material to the shape that matches each plane constituting the elbow member and attach it individually. In this case, the skill of the worker is required to perform the work well, such as by not creating gaps between each attached piece of thermal insulation material, which is a problem in terms of work efficiency, and it is unavoidable that a large amount of thermal insulation sheet will be wasted.

[0009] As an example of attaching thermal insulation material to the surface of the above-mentioned elbow member, Figure 2 schematically shows an example of attaching planar thermal insulation material to each plane of the elbow member, using thermal insulation material of a predetermined thickness, to the elbow member shown in Figure 1(b). In Figure 2, a cross-section in the XY plane of the elbow member having a bend in the XY plane (Figure 2(a)) and a cross-section including the AA cross-section in Figure 2(a) (Figure 2(b)) are shown.

[0010] As shown in Figure 2(a), when insulation material 3, which has been cut to have an end face perpendicular to the surface, is attached to a point where the planes constituting the duct wall 2 intersect at a predetermined angle, a gap 20 in the insulation material is created at the corner of the duct wall 2, resulting in the problem that sufficient insulation cannot be achieved at that point.

[0011] Furthermore, in the case of foamed synthetic rubber sheets used as thermal insulation, a dense skin layer 4 is provided on the surface of the thermal insulation to prevent moisture and dirt from entering the porous portion 3 inside the thermal insulation. However, when using the thermal insulation, the gaps 20 in the thermal insulation expose the edges of the insulation where the skin layer 4 is not provided, which makes it easy for moisture and dirt to enter the interior of the thermal insulation.

[0012] Furthermore, as shown in Figure 2(b), when a planar insulating material with the skin layer 4 is attached to each surface of a cylindrical duct, the end face of the insulating material 3 is exposed at the corners of the duct, and the porous part inside the insulating material is exposed to the outside. Patent Document 3 describes a technique in which the entire surface of the duct to which the insulating material is attached is covered with a silicone resin film. The problem of the porous part of the insulating material being exposed from the end face of the insulating material also occurs in each component constituting the elbow section, and the same countermeasures as the technique described in Patent Document 3 are required.

[0013] All of the above problems stem from the shape of the duct elbow components. Due to the fact that the shape of these elbow components is not necessarily standardized, the work has traditionally relied on manual labor based on the skills and intuition of the workers, and there has been a need to improve efficiency. The present invention aims to solve the above-mentioned problems and provide a technology for more efficiently forming duct elbow sections. [Means for solving the problem]

[0014] To solve the above problems, the present invention provides the following heat insulating material and the like. (1) A thermal insulation member comprising a first thermal insulation material having substantially uniform thickness and a second thermal insulation material having substantially uniform thickness connected to the first thermal insulation material via a first V-shaped groove whose bottom corner is substantially perpendicular to the first thermal insulation material, wherein the first thermal insulation material has a first non-parallel end face which is substantially perpendicular to the surface of the thermal insulation material and whose normal is non-parallel and non-perpendicular to the extending direction of the first V-shaped groove, and the second thermal insulation material has a first inclined end face whose normal is non-parallel to the extending direction of the first V-shaped groove, and when the first thermal insulation material and the second thermal insulation material are arranged substantially perpendicular to each other by bending along the first V-shaped groove, the first non-parallel end face and the first inclined end face are in a common plane. (2) The above-mentioned thermal insulation member wherein the first thermal insulation material has a second non-parallel end face, and the second thermal insulation material has a second inclined end face, and when the first thermal insulation material and the second thermal insulation material are arranged at approximately a right angle by bending along the first V-shaped groove, the second non-parallel end face and the second inclined end face are in a common plane. (3) The thermal insulation member further comprises a third thermal insulation material having substantially uniform thickness, which is connected to the first thermal insulation material via a second V-shaped groove whose bottom corner is substantially perpendicular, wherein the extension direction of the second V-shaped groove is substantially parallel to the extension direction of the first V-shaped groove, and the third thermal insulation material has a third inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove, and when the first thermal insulation material and the third thermal insulation material are arranged substantially perpendicular to each other by bending along the second V-shaped groove, the first non-parallel end face and the third inclined end face are in a common plane. (4) The above-mentioned thermal insulation member wherein the first thermal insulation material has a second non-parallel end face, the second thermal insulation material has a second inclined end face, and the third thermal insulation material has a fourth inclined end face, and when the third thermal insulation material is positioned approximately perpendicular to the first thermal insulation material by bending it along the second V-shaped groove, the second non-parallel end face and the fourth inclined end face are in a common plane. (5) The thermal insulation member further comprises a third thermal insulation material having substantially uniform thickness and connected to the first thermal insulation material via a second V-shaped groove whose bottom corner is substantially perpendicular, and a fourth thermal insulation material having substantially uniform thickness and connected to the third thermal insulation material via a third V-shaped groove whose bottom corner is substantially perpendicular, wherein the extension directions of the second and third V-shaped grooves are substantially parallel to the extension direction of the first V-shaped groove, the third thermal insulation material has a third inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove, and the fourth thermal insulation material has a third non-parallel end face whose normal is not parallel to the extension direction of the first V-shaped groove, and when the first thermal insulation material is bent along the second and third V-shaped grooves so that it is substantially perpendicular to the third thermal insulation material and is positioned substantially parallel to the fourth thermal insulation material, the first non-parallel end face, the third inclined end face and the third non-parallel end face are in a common plane. (6) The above-mentioned thermal insulation member wherein the first thermal insulation material has a second non-parallel end face, the second thermal insulation material has a second inclined end face, the third thermal insulation material has a fourth inclined end face, and the fourth thermal insulation material has a fourth non-parallel end face, and when the first thermal insulation material is bent along the second and third V-shaped grooves so that it is approximately perpendicular to the third thermal insulation material, and when the first thermal insulation material is placed approximately parallel to the fourth thermal insulation material, the second non-parallel end face, the fourth inclined end face, and the fourth non-parallel end face are in a common plane. (7) The insulation further comprises a third insulation material having substantially uniform thickness, connected to the first insulation material via a second V-shaped groove whose bottom corner is substantially perpendicular, a fourth insulation material having substantially uniform thickness, connected to the third insulation material via a third V-shaped groove whose bottom corner is substantially perpendicular, and a fifth insulation material having substantially uniform thickness, connected to the fourth insulation material via a fourth V-shaped groove whose bottom corner is substantially perpendicular, wherein the extension directions of the second to fourth V-shaped grooves are substantially parallel to the extension direction of the first V-shaped groove, and the distance between the first V-shaped groove and the second V-shaped groove is the distance between the third V-shaped groove and the fourth V-shaped groove. The above-mentioned insulating member is such that, when the distance is approximately equal to the distance, the third insulating material has a third inclined end face whose normal is not parallel to the extension direction of the second V-shaped groove, the fourth insulating material has a third non-parallel end face whose normal is not parallel to the extension direction of the first V-shaped groove, and the fifth insulating material has a fifth inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove, and when the first insulating material is bent along the second to fourth V-shaped grooves, it is approximately perpendicular to the third and fifth insulating materials, and when the insulating material is placed approximately parallel to the fourth insulating material, the first non-parallel end face, the third inclined end face, and the fifth non-parallel end face are in a common plane. (8) The first insulating material has a second non-parallel end face, the second insulating material has a second inclined end face, the third insulating material has a fourth inclined end face, the fourth insulating material has a fourth non-parallel end face, and the fifth insulating material has a sixth inclined end face. The above-mentioned insulating member, wherein the first insulating material is bent along the second and third V-shaped grooves so that it is approximately perpendicular to the third and fifth insulating materials, and when placed approximately parallel to the fourth insulating material, the second non-parallel end face, the fourth inclined end face, the fourth non-parallel end face, and the sixth inclined end face are in a common plane. (9) An insulating sheet comprising at least two insulating materials selected from the insulating materials described above. (10) The above-mentioned thermal insulation sheet wherein at least one of the non-parallel end faces or inclined end faces of two thermal insulation members adjacent to the thermal insulation sheet is formed simultaneously by introducing a cut surface into the thermal insulation sheet. [Effects of the Invention]

[0015] According to the present invention, it is possible to more efficiently attach a heat insulating material to an elbow portion of a duct formed of metal or the like, or to efficiently form the elbow portion of the duct with a heat insulating material, thereby improving the efficiency of duct installation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] [Figure 1] It is a schematic diagram showing an elbow portion of a conventional duct. [Figure 2] It is a schematic diagram showing a state where a heat insulating material is provided on an elbow portion or the like of a conventional duct. [Figure 3] It is a schematic diagram showing a state where the heat insulating material 3 according to the present invention is attached to a bent portion of a duct. [Figure 4] It is a schematic diagram showing an example of the shape of a heat insulating material attached to a bent portion of a duct. [Figure 5] It is a diagram showing a cross-section or the like of a bent portion of a duct provided with a heat insulating material. [Figure 6] It is a schematic diagram showing an example of the shape of a heat insulating material attached to a bent portion of a duct. [Figure 7] It is a schematic diagram showing an example of the heat insulating member according to the present invention. [Figure 8] It is a schematic diagram showing another example of the heat insulating member according to the present invention. [Figure 9] It is a schematic diagram showing a state where the heat insulating member according to the present invention is attached to a duct 2. [Figure 10] It is a schematic diagram showing the structure of a butt portion when covering a duct with the heat insulating member according to the present invention. [Figure 11] It is a schematic diagram showing another structure of the butt portion of the heat insulating member according to the present invention. [Figure 12] It is a schematic diagram showing another example of the heat insulating member according to the present invention. [Figure 13] It is a schematic diagram showing the structure of the butt portion of the heat insulating member according to the present invention. [Figure 14] It is a schematic diagram showing another example of the heat insulating member according to the present invention. [Figure 15]This is a schematic diagram showing an example of a heat insulating sheet according to the present invention. [Figure 16] This is a schematic diagram illustrating a method for forming a thermal insulation member according to the present invention. [Modes for carrying out the invention]

[0017] In conventional air conditioning ducts, as described in Patent Document 1, there are many examples of forming insulated ducts using corrugated cardboard, which is relatively thin and has a high degree of freedom in the shape of its ends, or as described in Patent Document 2, there are many examples of attaching glass wool, which has a high degree of freedom in shape, as an insulating material to a duct formed from a metal plate, and it is thought that this structure made it relatively easy for on-site workers to handle the formation of the elbow section of the duct.

[0018] On the other hand, from the perspective of fire resistance of buildings and reducing the impact of insulation materials on the human body, the use of flame-retardant foamed synthetic rubber sheets, etc., as specified in JIS A9516, is recommended as insulation material for ducts. However, foamed synthetic rubber used as insulation material for ducts is generally about 20 to 30 mm thick, and because it has higher shape retention than glass wool, etc., it is difficult to create complex shapes such as elbows in ducts by elastically deforming the ends to give them the desired shape, making installation more difficult compared to corrugated cardboard or glass wool.

[0019] In order to overcome the difficulties described above, the inventors investigated a means of efficiently forming an insulating layer on an elbow member of a duct having a rectangular cross-section using an insulating sheet material made of foamed synthetic rubber or the like. They found that by using an insulating member that includes an insulating material having an inclined end surface that is inclined at a predetermined angle (θ) with respect to the surface of the insulating sheet material from which the insulating material to be attached to each surface of the elbow member is cut, efficient work becomes possible, and waste of insulating sheet material is minimized, leading to the present invention.

[0020] Figure 3 schematically shows the state when the thermal insulation material 3 according to the present invention is attached to a duct wall 2 including the Z-axis around the bend of a rectangular duct that bends at a predetermined angle (ψ) in the XY plane. In Figure 3, to distinguish between the front and back surfaces of the thermal insulation material 3, one surface (front) is shown with a solid line and the other surface (back) with a dashed line.

[0021] As shown in Figure 3, by using insulating materials 3a and 3b, which have inclined end faces that are tilted relative to the surface by an angle (θ) that is half the angle (ψ) at which the duct bends, and by attaching these inclined end faces together at the bend of the duct, it is possible to cover the upper surface of the duct with insulating material without creating a gap 20 in the insulating material as shown in Figure 2(a) (part A in Figure 3).

[0022] Furthermore, when the insulation material 3a and 3b are cut from the sheet-like insulation material, the end faces of the scraps (insulation material 3a', 3b') similarly have inclined end faces with an angle (θ) to the surface. Therefore, by butting these scraps (insulation material 3a', 3b') against the lower surface of the bent portion of the duct, it becomes possible to cover the lower surface of the elbow portion with the insulation material without creating any gaps 20, just as with the upper surface (part B in Figure 3), thus making it possible to use the insulation sheet material without waste.

[0023] In other words, when cutting out the insulated end surfaces 3a and 3b, which have inclined end surfaces as described above, by cutting an insulating sheet material, it is possible to simultaneously form the inclined end surfaces of each insulating material by introducing a cutting surface that forms an angle (θ) with respect to the insulating sheet material. This prevents waste of the insulating sheet material and simplifies the cutting process.

[0024] Furthermore, when the same size insulation sheet material is used to cut out insulation materials 3a, 3a' and insulation materials 3b, 3b' as described above, and attached to the bend of the duct in the form shown in Figure 3, both straight lines 13 and 13' connecting the end faces 8 of each insulation material that are opposite to the inclined end faces that abut at the bend of the duct will cross the duct perpendicularly. As a result, the attachment of insulation material to the straight section of the duct connected to the bend can be done simply by wrapping a rectangular piece of insulation material of a predetermined size around it, which also allows for efficient use of the insulation sheet material and improves workability.

[0025] Figure 4 schematically shows examples of the shapes of the thermal insulation materials 3a, b, etc., included in the thermal insulation member according to the present invention. These thermal insulation materials can be formed by cutting and shaping them along their contours from a thermal insulation sheet material having a predetermined substantially uniform thickness, and the surface 9 of the thermal insulation materials 3a, b, etc. is formed by the surface of the thermal insulation sheet material. In addition, the end faces 6 to 8 of the thermal insulation materials 3a, b, etc. are formed by the cut surfaces when the thermal insulation sheet material is cut.

[0026] Furthermore, by making at least one of the end faces (cut surfaces) an inclined end face 6 that forms a predetermined angle (θ) with respect to the surface 9, it becomes possible to cover the upper and lower surfaces of the duct's bend at an angle (ψ) twice the angle (θ) without creating any gaps in the insulation material, as shown in Figure 3.

[0027] In the thermal insulation material 3, the other two end faces 7 that intersect with the inclined end face 6 can be provided parallel to the side surface of the duct to which the thermal insulation material is attached (the surface perpendicular to the Z-axis in Figure 3). For example, if the cross-section of the duct to which the thermal insulation material is attached is rectangular, the end faces 7 can be provided perpendicular to the surface (back surface) of the sheet.

[0028] Furthermore, in the insulation material 3, the angle that the end face 8 opposite to the inclined end face 6 makes with the surface 9 of the sheet can be determined according to the angles of other bends provided in the elbow portion of the duct. In other words, if the end face 8 is not located in a bend of the duct, by setting the end face 8 perpendicular to the surface 9, it is possible to easily and seamlessly connect the insulation material 3 to other insulation materials attached to the duct in contact with it. Furthermore, the end face 8 of the insulation material 3 that is not located at the bend of the duct can also have an appropriate shape other than simply being provided perpendicular to the surface 9, depending on its relationship with other insulation materials connected to the insulation material 3.

[0029] Furthermore, for example, as shown in Figure 1(b), when an elbow member is constructed by dividing it into three or more parts to include multiple bends, the insulating material attached to the portion sandwiched between the multiple bends can be made such that the insulating material has two inclined end faces, either an end face 8 (Figure 4(b)) that is inclined at the same angle (θ) as the angle (θ) that the inclined end face 6 makes with the surface 9, or an end face 8 (Figure 4(c)) that is inclined at a different angle (θ'), as shown in Figures 4(b) and (c), thereby easily covering the space between two adjacent bends.

[0030] In this specification, the angle (θ) that the inclined end face 6 makes with the surface 9 shall be used to mean the smaller of the two angles that the end face makes with the two surfaces 9 of the insulating material 3 (the acute angle).

[0031] Figure 5(a) schematically shows the state of the BB cross section (bent section of the duct) in Figure 3 when viewed from the "right side" in the figure. Since the BB cross section forms an angle (θ) with respect to the X-axis in Figure 3, the inclined end faces 6 of the insulation materials 3a and 3b' shown in Figure 3 are located within the BB cross section. By attaching the insulation materials 3c and 3d to the side surface (the surface perpendicular to the Z-axis) of the duct wall 2, the entire outer surface of the duct wall 2 can be covered with insulation without any gaps.

[0032] In the above-mentioned insulation materials 3c and 3d, by having the end face 10 have an angle (θ) with respect to the duct extension direction to which the insulation material 3a, etc. is attached, and by making it a surface perpendicular to the surface of the insulation materials 3c and 3d, the end face 10 will be located within the BB cross section, and as a result it will be possible to have the inclined end face 6 of the insulation materials 3a and 3b' and the end face 10 all located in a common plane. Furthermore, since the normal to the end face 10 described above is not parallel to the duct extension direction, it may be referred to as a non-parallel end face in the following explanation.

[0033] Furthermore, when the BB cross section in Figure 3 is observed from the "left side," similar to Figure 5(a), it is possible to have all the inclined end faces 6 and non-parallel end faces 10 of the insulation materials 3a', 3b, 3c', and 3d' located within a common plane. As a result, the insulation materials on the right and left sides of the BB cross section are aligned within the BB cross section, making it possible to attach the insulation material to the bent portion of the duct without creating gaps 20, etc. In addition, since the insulation materials 3c' and 3d' can be made from the scraps left when the insulation materials 3c and 3d are cut from rectangular insulation material, there is no waste of insulation material in this respect either.

[0034] Figure 6 schematically shows the insulation material used when attaching insulation material to the bent section of a rectangular duct using the method shown in Figures 3 and 5. As shown in Figure 6, when attaching insulation material to the bent section of a rectangular duct using the method shown in Figure 5, four insulation materials are required on each side of the BB cross section in Figure 3, for a total of eight insulation materials (3a~d, 3a'~3d'). In Figure 6, the inclined end faces 6 of the insulation material are shown with solid lines for the inclined end faces 6 observed from above in the figure, and with dashed lines for the inclined end faces 6 facing downwards in the figure.

[0035] In the insulation materials shown in Figure 6, the insulation materials 3a and 3a', 3b and 3b', 3c and 3c', and 3d and 3d', which are shown vertically in Figure 6, all correspond to the remaining portion when one side is cut off from a rectangular insulation sheet. Therefore, by cutting a predetermined insulation sheet material at an angle (θ) inclined with respect to its surface 9, the inclined end faces 6 of insulation materials 3a and 3a' (insulation materials 3b and 3b'), each having an inclination of angle (θ), can be formed simultaneously. Similarly, by cutting a predetermined insulation sheet material perpendicular to its surface 9, it is possible to simultaneously form the non-parallel end faces 10 of insulation materials 3c and 3c' (insulation materials 3d and 3d'), thus making efficient use of the base insulation sheet material and allowing each insulation material to be efficiently formed and attached to the bent section of the duct through a simple cutting process.

[0036] Furthermore, by making the lengths of each rectangular insulation sheet cut into insulation materials 3a and 3a', 3b and 3b', 3c and 3c', and 3d and 3d' the same (length in the direction in which they are cut when forming the end faces 6 and 10), it is possible to align the end face 13 in Figure 3(a) in a plane perpendicular to the extension direction of the duct, and to facilitate connection with insulation materials attached by wrapping rectangular insulation materials around the straight sections of the duct.

[0037] Figure 7 schematically shows the appearance of the insulation materials 3d and 3b', etc., when they are arranged in a continuous form. Figure 7(a) shows the insulation materials 3d and 3b' formed in the same manner as in Figure 6. In particular, at the butt joint between the insulation materials 3d and 3b', by extending the insulation material 3d beyond the corresponding duct dimension (P) by the thickness (t) of the insulation material 3b', it is possible to cover the end of the insulation material 3b' with the insulation material 3d, as shown in Figure 5(a). On the other hand, when the corners of a rectangular duct are covered with the insulation materials 3d and 3b', etc., the end of the insulation material 3d is exposed to the outside (exposed part 21 in Figure 5(a)), which can lead to problems such as reduced thermal insulation due to contamination, etc., if the inside of the insulation material 3d is porous.

[0038] In contrast to the above, as shown in Figure 7(b), by connecting the insulating materials corresponding to insulating materials 3d and 3b' with a V-shaped groove 12 having a bottom angle of approximately 90 degrees to form an insulating member 31, and by attaching the insulating member in a manner such as wrapping it around the rectangular duct while it is bent in the V-shaped groove 12, it is possible to effectively cover multiple surfaces of the rectangular duct and the corners sandwiched between those surfaces with a single insulating member. Furthermore, especially when using an insulating sheet material with a dense skin layer on its surface to constitute the insulating member 31, the edges of the insulating material are not exposed to the outside by leaving the skin layer on the bottom surface of the V-shaped groove, which is effective in preventing contamination of the insulating material due to the environment in which it is used. In the following explanation, a component containing multiple insulation materials connected by V-shaped grooves may be referred to as an "insulation component" to distinguish it from insulation materials attached to a single surface.

[0039] The thermal insulation member 31 shown in Figure 7(b) is formed by connecting two thermal insulation materials, corresponding to thermal insulation material 3d and 3b', via a V-shaped groove. The portion corresponding to thermal insulation material 3d is designated as the first thermal insulation material, having a non-parallel end face 10 that is substantially perpendicular to the surface of the thermal insulation material and whose normal does not coincide with the extension direction of the V-shaped groove. The thermal insulation member has a portion corresponding to thermal insulation material 3b' (second thermal insulation material) that has an inclined end face 6 that lies in a plane common to the non-parallel end face when the two thermal insulation materials are arranged at a substantially right angle by bending along the V-shaped groove.

[0040] Furthermore, the V-shaped groove of the insulating member 31 is formed by facing two inclined surfaces at approximately a right angle, with a width projected onto the surface of the insulating member 31 being approximately the same as the thickness of the insulating member. By bending the insulating member 31 along the V-shaped groove, the portions corresponding to the insulating material 3d and insulating material 3b' can be positioned at right angles to each other. When using the insulating member 31 shown in Figure 7(b), the entire circumference of the outer perimeter of the rectangular duct can be covered by also using insulating materials corresponding to the insulating materials 3c and 3a in Figure 6, or by using insulating materials to cover the surfaces not covered by the insulating member 31 shown in Figure 7(b), such as insulating members in which insulating materials corresponding to the insulating materials 3c and 3a are interconnected via the V-shaped groove 12.

[0041] When using an insulating material such as foamed rubber conforming to JIS A9516, the V-shaped groove 12 allows the insulating member 31 to be bent along the corner of the duct by setting the thickness of the insulating material remaining at the bottom of the V-shaped groove to 5-20%, or 7-15%, preferably 8-12%, of the thickness of the insulating material before processing. Furthermore, when using an insulating material with strong shape retention, the bendability can be ensured by setting the thickness of the insulating material remaining at the bottom of the V-shaped groove 12 to about 1-3 mm. In addition, the strength of the insulating member 31 can be maintained even when the thickness of the insulating material remaining at the bottom of the V-shaped groove is further reduced by attaching an appropriate adhesive sheet to the back surface of the surface with the V-shaped groove.

[0042] The heat insulating member 31 has an inclined end face 6 and a non-parallel end face 10 as described above. When the first heat insulating material and the second heat insulating material are placed at approximately a right angle by bending them along the V-shaped groove, the directions of the normals of the inclined end face 6 and the non-parallel end face 10 coincide, allowing them to exist in a common plane. In this invention, when it is stated that multiple surfaces exist within a common plane, it means that the normals of the multiple surfaces generally coincide, and one of the edges defining each surface coincides with an edge defining another surface, so that the multiple surfaces can generally contact a single plane simultaneously. On the other hand, by using a material with a predetermined elasticity as the material constituting the heat insulating member according to the present invention, a good heat insulating layer can be formed even if, for example, there is an error of about 2 to 3 mm in each part, and mathematical rigor is not necessarily required.

[0043] Similarly, when describing angles as approximately right angles, approximately parallel, etc., as described above, mathematical rigor is not required. Various processing errors can be included, as long as they do not create gaps that would be problematic when the heat insulating member according to the present invention is attached to a duct or the like.

[0044] Figure 7(b) shows an insulating member 31 in which two insulating materials corresponding to insulating material 3d and insulating material 3b' in Figure 7(a) are used as the first and second insulating materials and connected via a V-shaped groove 12. However, the present invention is not limited to this, and an insulating member can be made in which 3 or 4 insulating materials selected from the insulating materials corresponding to insulating materials 3a, b', c, d (or insulating materials 3a', b, c', d') shown in Figure 6 are interconnected via a V-shaped groove 12 in the order shown in Figure 6.

[0045] In other words, the thermal insulation member according to the present invention can be configured such that a thermal insulation material having a non-parallel end face 10 (for example, thermal insulation materials 3c, 3d in Figure 6) is used as a base, and thermal insulation materials having inclined end faces 6 (for example, thermal insulation materials 3a, 3b' in Figure 6) are connected to both sides of it via V-shaped grooves 12, or that a thermal insulation material having an inclined end face 6 is used as a base, and thermal insulation materials having non-parallel end faces 10 are connected to both sides of it via V-shaped grooves 12, thereby connecting the first to third thermal insulation materials to each other via two V-shaped grooves. Furthermore, it can also be configured such that four thermal insulation materials corresponding to thermal insulation materials 3a, b', c, d (thermal insulation materials 3a', b, c', d') shown in Figure 6 are connected via V-shaped grooves. Firstly, by including three or four insulation materials in the insulation member, it is possible to reduce the amount of work required when attaching the insulation member. In particular, by using an insulation member that includes insulation materials corresponding to insulation materials 3a, b', c, d (or insulation materials 3a', b, c', d') shown in Figure 6 as the first to fourth insulation materials, the installation of the insulation material can be completed by wrapping the insulation material around each part of the elbow member, similar to how rectangular insulation material is wrapped around a straight duct member.

[0046] Figure 8 shows an example of a thermal insulation member according to the present invention, which is a thermal insulation member 32 (thermal insulation member 33) formed by connecting thermal insulation materials corresponding to the thermal insulation materials 3a, b', c, d (thermal insulation materials 3a', b, c', d') shown in Figure 6 via V-shaped grooves. The thermal insulation member 32 shown in Figure 8 corresponds to a structure in which the first to fourth thermal insulation materials are interconnected via three V-shaped grooves. In the thermal insulation members 32 and 33 shown in Figure 8, each thermal insulation member has end portions 13 at both ends that are inclined at a 45-degree angle to its surface. When covering a duct with external dimensions P x Q with the thermal insulation members 32 and 33, a good thermal insulation layer can be formed by bringing these inclined portions 12 together.

[0047] Figure 9 schematically shows the state in which the heat insulating member 32 (33) shown in Figure 8 is attached to and covers the duct 2. As shown in Figure 9, the heat insulating member according to the present invention makes it possible to easily cover the duct by cutting a predetermined heat insulating member from a heat insulating sheet material in advance based on the external dimensions of the duct to which the heat insulating member is attached and the bending angle of the duct where it bends.

[0048] Figure 10 schematically shows the configuration of the connecting portion of the insulating member when covering a duct with the insulating member according to the present invention. When covering the outer surface of a duct by wrapping the insulating member shown in Figure 8, etc., it is necessary to butt the end portions 13 of the insulating member together to form a butt joint 22 when making the insulating member annular. In addition to forming the butt joint 22 by butting the end portions 13 which are inclined at a 45-degree angle as shown in Figure 9 (Figure 10(a)), forming it with an end portion perpendicular to the surface (Figure 10(b)) can reduce the areas where the thickness of the insulating material is thin and increase its strength. Furthermore, as shown in Figure 9(c) compared to Figure 9(b), the adhesive strength when bonding the butt joint 22 with an adhesive can be increased by providing irregularities inside the surface constituting the end portion 13 to increase the area of ​​the butt joint 22. Furthermore, as shown in Figure 9(d), it is possible to provide irregularities on the butt joint surface of the insulating material and to create a structure in which the end surface of the insulating material is not exposed.

[0049] Figure 11 schematically shows another form of the connecting portion of the insulating member when covering a duct with the insulating member according to the present invention. In addition to increasing the area of ​​the abutting portion 22 by providing irregularities on the interior surface constituting the end portion 13 of the insulating member as shown in Figure 10, a fitting structure 14 that creates a mutual fit can be introduced at the end portions 13 of the insulating members to be abutted, as shown in Figure 11. By introducing this fitting structure 14 and reducing the degree of freedom between the insulating members to be abutted, the inclined end surface 6 and non-parallel end surface 10 of the insulating member can be easily maintained in the same plane, improving the strength of the insulating member and making it less likely for gaps to occur between the insulating members.

[0050] Figure 12 schematically shows another example of the thermal insulation member according to the present invention. As shown in Figure 12, by providing the end portion of the thermal insulation member, which is formed by connecting each thermal insulation material, inside a predetermined thermal insulation material (thermal insulation material 3c in Figure 12), the butt joint portion 22 of the thermal insulation member can be provided on the surface of the duct. By adopting this structure, the load on the butt joint portion 22 is reduced compared to when the butt joint portion 22 is provided at the corner of the duct, and a highly durable thermal insulation layer can be provided. The thermal insulation member 32' shown in Figure 12 corresponds to a structure in which the first to fifth thermal insulation materials are interconnected via four V-shaped grooves.

[0051] The butt joint 22 can be located inside the insulation material having a non-parallel end face 10, as shown in Figure 12, or it can be located inside the insulation material having an inclined end face 6. Figure 13 schematically shows the structure of the butt joint 22 of the insulating material when it is provided on the surface of the duct. The end portion of the insulating material that forms the butt joint 22 can be made of an end face (plane) perpendicular to the surface of the insulating material 3c, 3c'', etc., as shown in Figure 13(a). Alternatively, as shown in Figure 13(b), the end face can be made uneven to increase the area to be joined with adhesive, etc., and an appropriate interlocking structure can be provided between the insulating materials. By providing an interlocking structure between the insulating materials, the inclined end face 6 or non-parallel end face 10 of the insulating material can be held well, and gaps can be prevented from forming between the insulating materials.

[0052] By using the insulating members 32 and 33 shown in Figure 8, and attaching them to both sides of a bent portion of a rectangular duct with external dimensions P × Q that bends at an angle of 2θ, the insulating material can be attached without creating gaps 20 between the insulating materials. For example, as shown in Figure 1(a), when constructing an elbow member that bends at an overall angle of 90 degrees at a single bend, the insulating members 32 and 33 with θ = 45 degrees in Figure 8 can be used to cover the bend without any gaps.

[0053] Furthermore, as shown in Figure 1(b), when constructing an elbow member that bends at an overall angle of 90 degrees with two bends, two sets of heat insulating members 32 and 33 with θ = 67.5 degrees as shown in Figure 8 can be used to attach to each bend, thereby completely covering each bend without any gaps.

[0054] Table 1 shows the angle (θ) values ​​in Figure 8 as an example, when an elbow member that bends at an overall angle of 90 degrees is to be constructed with 1 to 4 bends of equal angles. Even when the required bending angle for the elbow member is other than 90 degrees, the value of the angle (θ) in Figure 8 can be determined by considering the overall bending angle of the elbow member and the number of bends that make up that bending angle. By forming the required number of insulation members 32, 33 in advance based on these angles, the insulation material can be efficiently attached to the duct member.

[0055] [Table 1]

[0056] Figure 14 schematically shows other examples of configurations for insulation members attached to the bends of a duct. The insulation members 32, 34, and 35 shown in Figure 14 can preferably be used when attached to an elbow member having two bends with equal bending angles, as shown in Figure 1(b). The thermal insulation member 34 in Figure 14 corresponds to the thermal insulation material 33 in Figure 8, with its inclined end face 6 and non-parallel end face 10 arranged symmetrically in the vertical direction in the figure. Furthermore, the thermal insulation member 35 in Figure 14 has a shape that is vertically symmetrical to the thermal insulation member 32 in the figure. In other words, the thermal insulation member described in Figure 14 corresponds to a set of thermal insulation members described in Figure 8 joined with another set of thermal insulation members that have a vertically symmetrical shape to the first set of thermal insulation members. By using the thermal insulation member 34, it becomes possible to cover the portion sandwiched between two bends by wrapping a single thermal insulation member around it, making it possible to easily cover elbow members with complex shapes.

[0057] The set of thermal insulation members shown in Figure 14 is an example of thermal insulation material attached to an elbow member having two bends with equal bending angles. However, the present invention is not limited to this. By pre-forming thermal insulation members with shapes that match the number of bends in the elbow member and the spacing between the bends, it is possible to efficiently cover elbow members having any number of bends with thermal insulation material.

[0058] Figure 15 shows an example of an embodiment of the thermal insulation member (thermal insulation sheet) according to the present invention. As shown in Figures 8 and 14, when the thermal insulation members 32, 33 (or thermal insulation members 32, 34, 35), which have a shape that allows them to be attached to a rectangular duct by butting them together with the bent portion as the interface, are arranged in a planar manner in an unfolded state, it is possible to arrange them so that all of the inclined end faces 6 and non-parallel end faces 10 of each thermal insulation material are shared with the other thermal insulation materials. This means that, as shown in Figure 8, when forming the inclined end face 6 and non-parallel end face 10 of thermal insulation member 31 by cutting a single rectangular thermal insulation sheet, thermal insulation member 32 can be formed at the same time. In Figure 14, as well, when using a single rectangular thermal insulation sheet, thermal insulation member 34 can be formed as a result by cutting out thermal insulation members 32 and 35.

[0059] By utilizing the above relationship, the insulation materials 32 and 33 in Figure 8 can be pre-prepared as an insulation sheet containing each insulation component in a form that allows for easy separation, as shown in the insulation sheet 36 in Figure 15(a), and the insulation materials 32, 34, and 35 in Figure 14 can be pre-prepared as an insulation sheet containing each insulation component in a form that allows for easy separation. Furthermore, by creating an insulation sheet containing various insulation materials according to the external dimensions of the rectangular duct and the number and angle of bends in its elbow components, it becomes possible to store and distribute the materials without taking up much space, and to perform work efficiently at the site where the duct covering work is carried out.

[0060] As described above, the thermal insulation members according to the present invention can be used to form a thermal insulation layer on an existing elbow member made of a metal plate or the like by attaching them to the surface of the elbow member. On the other hand, in addition to forming a thermal insulation layer on the surface of an existing elbow member, the thermal insulation members according to the present invention can also be used to construct an elbow member using only the thermal insulation members, similar to general corrugated cardboard ducts. In particular, since materials that exhibit thermal insulation by having closed cells do not have breathability, by using thermal insulation members made of such materials, an elbow member can be constructed well using only the thermal insulation members.

[0061] Figure 16 schematically shows a method for introducing a cut surface when forming a thermal insulation member (thermal insulation sheet) according to the present invention by cutting a thermal insulation sheet material 38. The thermal insulation member according to the present invention can be formed by introducing a cut surface to a thermal insulation sheet material 38 having a predetermined thickness using a cutting tool such as a cutter 39.

[0062] There are no particular restrictions on the thickness of the thermal insulation sheet material 38 used to form the thermal insulation member according to the present invention, and it can be appropriately determined according to the thermal insulation performance and strength required for the duct. In particular, by including a predetermined inclined end face 6 in the thermal insulation member according to the present invention, even when using a thick thermal insulation sheet material 38, gaps between the thermal insulation materials are less likely to occur at the bent portion of the duct, and efficient installation work can be performed.

[0063] The thickness of the thermal insulation sheet material 38 used to form the thermal insulation member according to the present invention is preferably 5 mm or more, and sufficient thermal insulation can be obtained by setting it to 10 mm or more, or 15 mm or more. Furthermore, by using thermal insulation sheet material of 20 mm or more, the surface area of ​​the end face of the thermal insulation member is increased, making it easier to bond the thermal insulation members together. In addition, for example, when using thermal insulation sheet material made of foamed rubber or the like that conforming to JIS A9516, the strength of the thermal insulation member is improved by overlapping the sheet material as needed to make the overall thickness 30 mm or more, or 40 mm or more, and it becomes possible to form duct elbow members, etc., well using only the thermal insulation member according to the present invention.

[0064] As the thermal insulation sheet material 38 preferably used for forming the thermal insulation member according to the present invention, depending on the application, in addition to Aeroflex® and Armaflex® which conform to JIS A9516, commercially available thermal insulation materials such as Thermobreak® which uses polyolefin foam, sheet materials formed from glass wool or rock wool, expanded polystyrene, and corrugated cardboard can be used as appropriate.

[0065] When forming a thermal insulation sheet 36, for example, as shown in Figure 15(a), by cutting the thermal insulation sheet material 38, it is preferable to first introduce cut surfaces on the surface side of the thermal insulation sheet material 38 that correspond to three V-shaped grooves 12 and two end portions 13, using a rectangular thermal insulation sheet material 38 having predetermined dimensions. Since the V-shaped grooves 12 and end portions 13 are all at a 45-degree angle with respect to the surface of the thermal insulation sheet material 38, the cut surfaces can be introduced by moving the cutter 39 while it is inserted at a 45-degree angle with respect to the surface of the thermal insulation sheet material 38, as shown in Figure 16(c).

[0066] When introducing a cut surface to remove the portion corresponding to the V-shaped groove 12, the cut surface can be introduced by inserting the cutter 39 from both sides of the V-shaped groove 12 at a 45-degree angle and moving it in the direction of extension of the V-shaped groove 12. At that time, the cutting edge of the cutter 39 does not penetrate the insulation sheet material 38, and the cut surfaces introduced from both sides intersect inside the insulation sheet material 38, thereby enabling each insulation material to be connected via the V-shaped groove 12.

[0067] Subsequently, the heat insulating members 32 and 33 are formed by introducing cut surfaces that become the inclined end face 6 and the non-parallel end face 10. The cut surface that becomes the inclined end face 6 can be introduced by moving a cutter 39 that is held at an angle (θ) to the surface of the heat insulating sheet material 38, as shown in Figure 16(a). The cut surface that becomes the non-parallel end face 10 can be introduced by moving a cutter 39 that is held at a right angle to the surface of the heat insulating sheet material 38, as shown in Figure 16(b).

[0068] When introducing cut surfaces that form an inclined end face 6 and a non-parallel end face 10, the cutter 39 moves while penetrating the insulation sheet material 38, thereby separating each insulation member from the insulation sheet material 38. On the other hand, by appropriately leaving "uncut" areas where the cutter 39 does not penetrate the insulation sheet material 38, each insulation member contained in the insulation sheet material 38 remains continuous at those areas, making it possible to maintain the shape of the insulation sheet material 38 even after the predetermined cut surfaces have been introduced. By providing the insulation sheet material 38 in a so-called pre-cut state where each insulation member can be easily separated, handling becomes easier when manufacturing, storing, and distributing the insulation sheet material 38 in advance, while at the construction site, it becomes possible to efficiently install ducts by separating each insulation member from the insulation sheet material 38 for use.

[0069] The process of introducing a cut surface into the heat insulation sheet material 38 using the cutter 39 can be performed manually using various rulers or the like. Alternatively, by using a cutting device that holds and moves the blade of the cutter 39 in a way that allows it to vibrate at high speed, and inserting the blade of the cutter 39 into the surface of the heat insulation sheet material 38 at the angle shown in Figure 16, it becomes possible to form a heat insulation member accurately and efficiently. [Industrial applicability]

[0070] The thermal insulation member according to the present invention allows for efficient installation of thermal insulation material to the elbow member of a rectangular duct. Alternatively, by forming the elbow member of a rectangular duct using the thermal insulation member according to the present invention, it becomes possible to efficiently install the elbow member of the rectangular duct. [Explanation of Symbols]

[0071] 1 Elbow member 2. Duct (Duct Wall) 3. Insulation 4. Insulation skin layer 6. Inclined end face of insulation material that is inclined relative to the surface 7. End face of the insulation material intersecting the inclined end face. 8. End face of the insulating material opposite the inclined end face. 9. Surface of the insulation material (insulation sheet) 10 Non-parallel end faces of insulation material 12 V-groove 13 End portion of the insulation material 14. Interlocking structure 20. Gaps in insulation 21 Exposed portion of the end face of the insulation material 22 Butt joint of insulation material 31-35 Insulation material 36,37 Insulation sheet 38. Insulation sheet material 39 Cutter

Claims

1. An insulating member comprising a first insulating material having substantially uniform thickness and a second insulating material having substantially uniform thickness connected to the first insulating material via a first V-shaped groove whose bottom corner is substantially perpendicular, The first insulating material has a first non-parallel end face that is substantially perpendicular to the surface of the insulating material and whose normal is non-parallel and non-perpendicular to the extending direction of the first V-shaped groove. The second insulating material has a first inclined end face whose normal is not parallel to the extending direction of the first V-shaped groove. An insulating member characterized in that, when the first insulating material and the second insulating material are arranged at approximately a right angle by bending along the first V-shaped groove, the first non-parallel end face and the first inclined end face exist in a common plane.

2. The first insulating material has a second non-parallel end face, and the second insulating material has a second inclined end face. The thermal insulation member according to claim 1, characterized in that when the first thermal insulation material and the second thermal insulation material are arranged at approximately a right angle by bending them along the first V-shaped groove, the second non-parallel end face and the second inclined end face are in a common plane.

3. The present invention further comprises a third insulating material having a substantially uniform thickness, which is connected to the first insulating material via a second V-shaped groove whose bottom corner is substantially perpendicular to the first insulating material, The extension direction of the second V-shaped groove is substantially parallel to the extension direction of the first V-shaped groove. The third insulating material has a third inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove. The thermal insulation member according to claim 1, characterized in that when the first thermal insulation material and the third thermal insulation material are arranged at approximately right angles by bending them along the second V-shaped groove, the first non-parallel end face and the third inclined end face are in a common plane.

4. The first insulating material has a second non-parallel end face, the second insulating material has a second inclined end face, and the third insulating material has a fourth inclined end face. The thermal insulation member according to claim 3, characterized in that when the third thermal insulation material is positioned approximately perpendicular to the first thermal insulation material by bending it along the second V-shaped groove, the second non-parallel end face and the fourth inclined end face are in a common plane.

5. The invention further comprises a third insulating material having substantially uniform thickness, which is connected to the first insulating material via a second V-shaped groove whose bottom corner is substantially right-angled, and a fourth insulating material having substantially uniform thickness, which is connected to the third insulating material via a third V-shaped groove whose bottom corner is substantially right-angled. The extension directions of the second and third V-shaped grooves are substantially parallel to the extension direction of the first V-shaped groove. The third insulating material has a third inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove, and the fourth insulating material has a third non-parallel end face whose normal is not parallel to the extension direction of the first V-shaped groove. The thermal insulation member according to claim 1, characterized in that when the first thermal insulation material is bent along the second and third V-shaped grooves so that it is approximately perpendicular to the third thermal insulation material, and when it is arranged approximately parallel to the fourth thermal insulation material, the first non-parallel end face, the third inclined end face, and the third non-parallel end face are in a common plane.

6. The first insulating material has a second non-parallel end face, the second insulating material has a second inclined end face, the third insulating material has a fourth inclined end face, and the fourth insulating material has a fourth non-parallel end face. The thermal insulation member according to claim 5, characterized in that when the first thermal insulation material is bent along the second and third V-shaped grooves so that it is approximately perpendicular to the third thermal insulation material, and when it is arranged approximately parallel to the fourth thermal insulation material, the second non-parallel end face, the fourth inclined end face, and the fourth non-parallel end face are in a common plane.

7. The system further comprises: a third insulating material having substantially uniform thickness connected to the first insulating material via a second V-shaped groove whose bottom corner is substantially right-angled; a fourth insulating material having substantially uniform thickness connected to the third insulating material via a third V-shaped groove whose bottom corner is substantially right-angled; and a fifth insulating material having substantially uniform thickness connected to the fourth insulating material via a fourth V-shaped groove whose bottom corner is substantially right-angled. The extension directions of the second to fourth V-shaped grooves are all approximately parallel to the extension direction of the first V-shaped groove, and the distance between the first V-shaped groove and the second V-shaped groove is approximately equal to the distance between the third V-shaped groove and the fourth V-shaped groove. The third insulating material has a third inclined end face whose normal is not parallel to the extension direction of the second V-shaped groove, the fourth insulating material has a third non-parallel end face whose normal is not parallel to the extension direction of the first V-shaped groove, and the fifth insulating material has a fifth inclined end face whose normal is not parallel to the extension direction of the first V-shaped groove. By bending along the second to fourth V-shaped grooves, the first insulation material is positioned approximately perpendicular to the third and fifth insulation materials and approximately parallel to the fourth insulation material. The thermal insulation member according to claim 1, characterized in that the first non-parallel end face, the third inclined end face, and the fifth non-parallel end face are located in a common plane.

8. The first insulation material has a second non-parallel end face, the second insulation material has a second inclined end face, the third insulation material has a fourth inclined end face, the fourth insulation material has a fourth non-parallel end face, and the fifth insulation material has a sixth inclined end face. The thermal insulation member according to claim 7, characterized in that when the first thermal insulation material is bent along the second and third V-shaped grooves so that it is approximately perpendicular to the third and fifth thermal insulation materials, and when it is arranged approximately parallel to the fourth thermal insulation material, the second non-parallel end face, the fourth inclined end face, the fourth non-parallel end face, and the sixth inclined end face are in a common plane.

9. An insulating sheet characterized by comprising at least two insulating members selected from the insulating members described in claims 1 to 8 above.

10. The thermal insulation sheet according to claim 9, characterized in that at least one of the non-parallel end faces or inclined end faces of two thermal insulation members adjacent to the thermal insulation sheet is formed simultaneously by introducing a cut surface into the thermal insulation sheet.

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