Heat insulating materials

Abstract

The objective is to provide a technique for efficiently forming an elbow portion of a duct. [Solution] An insulating component having a first insulating material of approximately uniform thickness and a second insulating material of approximately uniform thickness connected to the first insulating material via a first V-shaped groove whose base angle is approximately perpendicular to the first insulating material, wherein the first insulating material has a first non-parallel end face that is approximately perpendicular to the surface of the insulating material and whose normal is non-parallel and non-perpendicular to the extension direction of the first V-shaped groove, and the second insulating material has a first inclined end face whose normal is non-parallel to the extension direction of the first V-shaped groove, and when the first insulating material and the second insulating material are arranged approximately perpendicular by bending them along the first V-shaped groove, the first non-parallel end face and the first inclined end face exist in a common plane.

Description

[Technical Field]

[0001] The present invention relates to a heat insulating member that constitutes a duct installed for the purpose of air conditioning equipment in a building. [Background technology]

[0002] Ducts, which are cylindrical passages, are widely used within buildings to circulate fresh air and various prepared gases for air conditioning purposes, and to circulate and guide gases within the building to the outside of the building for exhaust, ventilation, etc. Such ducts are required to be airtight to prevent the circulating gases from leaking out of the duct, as well as to provide insulation between the inside and outside of the duct depending on the gas being circulated, sound-damping properties to suppress noise generated by the gas flow, and non-flammability.

[0003] To meet the above-mentioned requirements, materials for ducts are selected and used according to the gas to be circulated, such as metal plates such as aluminum plates and steel plates, flame-retardant foam synthetic rubber sheets, and cardboard. For example, Patent Document 1 describes a technology for forming an air conditioning duct by forming a tube from a specific cardboard material.

[0004] In particular, in ducts for circulating cooled or heated gases, sheets of glass wool or foamed synthetic rubber are attached to the outer and inner surfaces of ducts made of metal plates to provide thermal insulation and prevent condensation caused by temperature differences. For example, Patent Document 2 describes an air conditioning duct in which a mat-like fibrous heat-insulating material is fixed to the outer and / or inner peripheral surface of the air conditioning duct with an adhesive, etc. Furthermore, Patent Document 3 describes an air conditioning duct in which a flat foam rubber heat-insulating material is attached to each surface constituting a rectangular metal duct body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-1095 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-171085 [Patent Document 3] Japanese Patent Publication No. 2020-169752 Summary of the Invention [Problem to be solved by the invention]

[0006] As described in the above 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 airtightness, insulating properties, sound-damping properties, etc. required. In this case, for example, as shown in Figure 3 of Patent Document 2, it is possible to relatively easily attach insulating material without gaps to the straight section of the duct by "wrapping" an insulating material that is rectangular overall. On the other hand, when installing ducts such as those described in Patent Documents 1 and 2 inside a building, it is essential to provide a bend in the duct depending on the structure of the building, etc., and it is common for a component called an elbow to be provided at the bend in the duct.

[0007] FIG. 1 shows an example of an elbow member used to bend a duct having a rectangular cross section by 90 degrees, as described in Patent Documents 2 and 3. Duct elbow members are primarily installed based on the requirements of the building in which the duct is installed, and the bending angle and shape of the bend vary widely. Meanwhile, because it is possible to cut the metal plate that constitutes the duct linearly and form it by bending, etc., using sheet metal processing, it is common to construct an elbow member as a whole by connecting multiple duct member sections having a rectangular cross section as shown in FIG. 1 and imparting a predetermined bending angle to their boundary surfaces. For example, for an elbow member having an overall 90-degree bend, FIG. 1(a) shows an example formed by connecting two duct member sections, and FIG. 1(b) shows an example formed by connecting three duct member sections.

[0008] It is desirable to apply a thermal insulating material to the surface of an elbow member 1 such as that shown in FIG. 1 to provide thermal insulation, sound-damping, and other properties. However, because the surface of an elbow member has a complex shape with multiple planes intersecting at a predetermined angle, it is difficult to properly apply the thermal insulating material by simply "wrapping" it around the surface as shown in FIG. 3 of Patent Document 2. Generally, it is necessary to cut the thermal insulating material into a shape that matches the respective planes that make up the elbow member and apply it individually. In this case, in order to properly perform this work, such as by ensuring that there are no gaps between the applied pieces of thermal insulating material, the worker's skill is required, which reduces work efficiency and inevitably results in a large amount of waste in the thermal insulating sheet used.

[0009] As an example of attaching a heat insulating material to the surface of the elbow member, Fig. 2 shows a schematic example of attaching a planar heat insulating material of a predetermined thickness to each flat surface of the elbow member as shown in Fig. 1(b). Fig. 2 shows a cross section in the XY plane of an elbow member having a bend in the XY plane (Fig. 2(a)), and a cross section including the AA cross section in Fig. 2(a) (Fig. 2(b)).

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

[0011] Furthermore, particularly in foamed synthetic rubber sheets and the like used as thermal insulation, a dense skin layer 4 is provided on the surface of the thermal insulation to prevent moisture, dirt, and the like from penetrating into the porous portion 3 inside the thermal insulation. When the thermal insulation is used, the end face of the thermal insulation where the skin layer 4 is not provided is exposed in the gaps 20 of the thermal insulation, which poses a problem that moisture, dirt, and the like are likely to penetrate into the thermal insulation.

[0012] Furthermore, as shown in Figure 2(b), when a planar insulating material provided with the above-mentioned skin layer 4 is attached to each surface of a cylindrical duct, the end faces of the insulating material 3 are exposed at the corners of the duct, causing the problem of the porous portion inside the insulating material being exposed to the outside, and 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 portion of the insulating material being exposed from the end faces of the insulating material also occurs in each member constituting the elbow part, and a solution similar to the technique described in Patent Document 3 is required.

[0013] All of the above problems are caused by the shape of the duct elbow component, and due to factors such as the fact that the shape of the elbow component is not necessarily standardized, work has traditionally been done manually, relying on the skill and intuition of the worker, and there has been a demand for improvements in this area. An object of the present invention is to solve the above-mentioned problems and to provide a technique for more efficiently forming an elbow portion of a duct. [Means for solving the problem]

[0014] In order to solve the above problems, the present invention provides the following heat insulating member, etc. (1) An insulating component having a first insulating material of approximately uniform thickness and a second insulating material of approximately uniform thickness connected to the first insulating material via a first V-shaped groove whose base angle is approximately right angles, wherein the first insulating material has a first non-parallel end face that is approximately perpendicular to the surface of the insulating material and whose normal is non-parallel and non-perpendicular to the extension direction of the first V-shaped groove, and the second insulating material has a first inclined end face whose normal is non-parallel to the extension direction of the first V-shaped groove, and when the first insulating material and the second insulating material are arranged approximately right angles by bending them 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 above-mentioned insulating member, wherein the first insulating material has a second non-parallel end face, the second insulating material has a second inclined end face, and when the first insulating material and the second insulating material are arranged at approximately right angles by bending them along the first V-groove, the second non-parallel end face and the second inclined end face exist in a common plane. (3) The above-mentioned insulating component further comprises a third insulating material having a substantially uniform thickness connected to the first insulating material via a second V-groove having a base angle substantially perpendicular to the first insulating material, the extension direction of the second V-groove being substantially parallel to the extension direction of the first V-groove, and the third insulating material having a third inclined end face whose normal is not parallel to the extension direction of the first V-groove, and when the first insulating material and the third insulating material are arranged substantially perpendicular to each other by bending along the second V-groove, the first non-parallel end face and the third inclined end face are in a common plane. (4) The above-mentioned insulating member, wherein 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, and when the third insulating material is positioned approximately perpendicular to the first insulating material by bending it along the second V-shaped groove, the second non-parallel end face and the fourth inclined end face exist in a common plane. (5) The insulating component further comprises a third insulating material having a substantially uniform thickness connected to the first insulating material via a second V-groove having a base angle substantially perpendicular to the first insulating material, and a fourth insulating material having a substantially uniform thickness connected to the third insulating material via a third V-groove having a base angle substantially perpendicular to the third insulating material, wherein the extension direction of the second and third V-grooves is substantially parallel to the extension direction of the first V-groove, the third insulating material has a third inclined end face whose normal is not parallel to the extension direction of the first V-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-groove, and when the first insulating material is bent along the second and third V-grooves so that it is substantially perpendicular to the third insulating material and is arranged substantially parallel to the fourth insulating material, the first non-parallel end face, the third inclined end face, and the third non-parallel end face exist in a common plane. (6) An insulating member as described above, wherein 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, and when the first insulating material is bent along the second and third V-grooves so as to be approximately perpendicular to the third insulating material, and when arranged approximately parallel to the fourth insulating material, the second non-parallel end face, the fourth inclined end face, and the fourth non-parallel end face exist in a common plane. (7) The insulating material further includes a third insulating material having a substantially uniform thickness connected to the first insulating material via a second V-groove having a base angle of substantially right angles, a fourth insulating material having a substantially uniform thickness connected to the third insulating material via a third V-groove having a base angle of substantially right angles, and a fifth insulating material having a substantially uniform thickness connected to the fourth insulating material via a fourth V-groove having a base angle of substantially right angles, wherein the extension directions of the second to fourth V-grooves are all substantially parallel to the extension direction of the first V-groove, and the distance between the first V-groove and the second V-groove is approximately the same as the distance between the third V-groove and the fourth V-groove. The distance between the third insulating material and the fourth insulating material is approximately equal to the extension direction of the second V-shaped groove, the third insulating material has a third inclined end face whose normal is non-parallel to the extension direction of the first V-shaped groove, the fourth insulating material has a third non-parallel end face whose normal is non-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 non-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, the first insulating material is approximately perpendicular to the third and fifth insulating materials, and when arranged 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 when the first insulating material is bent along the second and third V-grooves, it is approximately perpendicular to the third and fifth insulating materials, and when arranged 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) A heat insulating sheet including at least two heat insulating members selected from the heat insulating members described above. (10) The above-mentioned insulating sheet, wherein at least one of the non-parallel end faces or inclined end faces of the two insulating members included adjacent to the insulating sheet is formed simultaneously by introducing a cut surface into the insulating sheet. [Effects of the Invention]

[0015] According to the present invention, it is possible to more efficiently attach insulation material to the elbow portion of a duct made of metal or the like, or to efficiently form the elbow portion of a duct using insulation material, thereby making duct installation work more efficient. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram showing an elbow portion of a conventional duct. [Figure 2] FIG. 1 is a schematic diagram showing a state where a heat insulating material is provided at an elbow portion of a conventional duct. [Figure 3] FIG. 2 is a schematic diagram showing a state in which a heat insulating material 3 according to the present invention is attached to a bent portion of a duct. [Figure 4] 10A and 10B are schematic diagrams showing examples of shapes of heat insulating material attached to a bent portion of a duct. [Figure 5] 10A and 10B are diagrams showing a cross section of a bent portion of a duct to which a heat insulating material is attached. [Figure 6] 10A and 10B are schematic diagrams showing examples of shapes of heat insulating material attached to a bent portion of a duct. [Figure 7] 1 is a schematic diagram showing an example of a heat insulating member according to the present invention. [Figure 8] FIG. 4 is a schematic view showing another example of a heat insulating member according to the present invention. [Figure 9] 1 is a schematic diagram showing a state in which a heat insulating member according to the present invention is attached to a duct 2. FIG. [Figure 10] 1 is a schematic diagram showing the structure of a butt joint when a duct is covered with a heat insulating member according to the present invention. FIG. [Figure 11] 10 is a schematic diagram showing another structure of the butt joint of the heat insulating member according to the present invention. FIG. [Figure 12] FIG. 4 is a schematic view showing another example of a heat insulating member according to the present invention. [Figure 13] 3 is a schematic diagram showing the structure of a butt joint of a heat insulating member according to the present invention. FIG. [Figure 14] FIG. 4 is a schematic view showing another example of a heat insulating member according to the present invention. [Figure 15]1 is a schematic diagram showing an example of a heat insulating sheet according to the present invention. [Figure 16] 1A to 1C are schematic diagrams illustrating a method for forming a heat insulating member according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] In conventional air conditioning ducts, as described in Patent Document 1, there are many examples in which a duct with insulating properties is formed from cardboard, which is relatively thin and has a large degree of freedom in the shape of the end, or as described in Patent Document 2, there are many examples in which glass wool, which has a large degree of freedom in the shape, is attached as an insulating material to a duct formed from a metal plate, and it is thought that when forming the elbow part of a duct using such a structure, it was relatively easy for on-site workers to handle it.

[0018] On the other hand, from the viewpoint of improving the fire resistance of buildings and reducing the impact of the insulation materials used on the human body, it is recommended to use flame-retardant foamed synthetic rubber sheets and the like specified in JIS A9516 as insulation materials for ducts. However, the foamed synthetic rubber used as insulation materials for ducts is generally about 20 to 30 mm thick and has better shape retention than glass wool, etc., so when attempting to create complex shapes such as elbows in ducts, it is difficult to give the desired shape by elastically deforming the end portion, etc., making installation more difficult than the above-mentioned cardboard, glass wool, etc.

[0019] In order to overcome the above-mentioned difficulties, the inventors have considered means for efficiently forming an insulating layer on an elbow member of a duct having a rectangular cross section using insulating sheet material made of foamed synthetic rubber or the like. They have found that by using an insulating member including insulating material with an inclined end face that is inclined at a predetermined angle (θ) relative to the surface of the insulating sheet material from which the insulating material to be attached to each surface portion of the elbow member is cut out, efficient work can be performed and the insulating sheet material used is less likely to be wasted, leading to the present invention.

[0020] Figure 3 shows a schematic diagram of a state in which a thermal insulating material 3 according to the present invention is attached to a duct wall 2 including the Z axis around the bent portion of a rectangular duct that is bent at a predetermined angle (ψ) in the XY plane. In Figure 3, in order to distinguish between the front and back surfaces of the thermal insulating material 3, one surface (front surface) is drawn with a solid line and the other surface (back surface) is drawn with a dashed line.

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

[0022] Furthermore, when the insulating materials 3a and 3b are cut from the sheet-like insulating material, the end faces of the scrap pieces (insulating materials 3a' and 3b') similarly have inclined end faces having an angle (θ) relative to the surface.Therefore, by attaching the scrap pieces (insulating materials 3a' and 3b') so that they are butted up against the lower surface of the bent part of the duct, it becomes possible to cover the lower surface of the elbow part with insulating material without creating a gap 20, just like the upper surface (part B in Figure 3), and it becomes possible to use the insulating sheet material without waste.

[0023] In other words, when cutting out insulating material 3a and insulating material 3b having inclined end surfaces as described above by cutting insulating sheet material, by introducing a cutting plane that forms an angle (θ) with respect to the insulating sheet material, it is possible to simultaneously form the inclined end surfaces of each insulating material, thereby preventing waste of insulating sheet material and simplifying the cutting process.

[0024] Furthermore, when insulating sheet material of the same size is used as the insulating sheet material from which insulating materials 3a, 3a' are cut and as the insulating sheet material from which insulating materials 3b, 3b' are cut as described above and attached to the bent portion of the duct in the form shown in Figure 3, both of the straight lines 13, 13' connecting the end faces 8 of each insulating material that face each of the inclined end faces that meet at the bent portion of the duct will cross the duct perpendicularly. This makes it possible to attach insulating material to the straight portion of the duct that connects to the bent portion of the duct by simply wrapping a rectangular insulating material of a predetermined size around it, which also makes it possible to use the insulating sheet material efficiently and improves workability.

[0025] 4 shows a schematic diagram of an example of the shape of the heat insulating materials 3a, b, etc. included in the heat insulating member according to the present invention. The heat insulating materials can be formed by cutting along the contours of a heat insulating sheet material having a predetermined, substantially uniform thickness, and the surfaces of the heat insulating sheet material form the surfaces 9 of the heat insulating materials 3a, b, etc. Furthermore, the cut surfaces of the heat insulating sheet material form the end faces 6-8 of the heat insulating materials 3a, b, etc.

[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 bent portion of the duct that bends at an angle (ψ) twice the angle (θ) without creating gaps in the insulation, as shown in Figure 3.

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

[0028] Furthermore, in the thermal insulation material 3, the angle that the end face 8 opposite the inclined end face 6 makes with the surface 9 of the sheet can be determined depending on the angle of other bends provided at the elbow part of the duct. In other words, if the end face 8 is not located at a bend in the duct, by providing the end face 8 perpendicular to the surface 9, it is possible to easily connect the thermal insulation material 3 to other thermal insulation materials attached to the duct without any gaps by contacting the thermal insulation material 3. Furthermore, the end faces 8 of the insulation 3 that are not located at the bend in the duct can have any appropriate shape other than simply being perpendicular to the surface 9, depending on their relationship with other insulations connected to the insulation 3.

[0029] Furthermore, for example, when an elbow member is constructed by dividing it into three or more parts to include multiple bends, as shown in Figure 1(b), the insulation material attached to the part sandwiched between the multiple bends can have an end face 8 (Figure 4(b)) that is inclined at the same angle (θ) as the angle that the inclined end face 6 makes with the surface 9, or an end face 8 (Figure 4(c)) that is inclined at an angle (θ') different from the angle (θ), as shown in Figures 4(b) and (c), thereby making the insulation material have two inclined end faces, thereby making it easy to cover the space between two adjacent bends.

[0030] In this specification, the angle (θ) formed by the inclined end face 6 and the surface 9 is used to mean the smaller angle (acute angle) of the two angles formed by the end face and the two surfaces 9 of the insulation material 3.

[0031] Figure 5(a) shows a schematic view of the BB cross section (the bent portion of the duct) in Figure 3, as viewed from the "right side" of the figure. Because the BB cross section forms an angle (θ) with respect to the X-axis in Figure 3, the inclined end faces 6 of the thermal insulation materials 3a and 3b' shown in Figure 3 are present within the BB cross section. By attaching the thermal insulation materials 3c and 3d to the side surfaces of the duct wall 2 (surfaces perpendicular to the Z-axis), the thermal insulation materials can be attached to the entire outer periphery of the duct wall 2 without any gaps.

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

[0033] 3 from the "left side," as in FIG. 5(a), the inclined end faces 6 and non-parallel end faces 10 of the thermal insulation materials 3a', 3b, 3c', and 3d' can all be made to exist on a common plane, and as a result, the thermal insulation materials on the right and left sides of the thermal insulation material 3c' and 3d' are aligned within the thermal insulation material 3c and 3d, making it possible to attach the thermal insulation materials to the bent portion of the duct without creating gaps 20. Furthermore, the thermal insulation materials 3c' and 3d' can be made from the waste material that is generated when the thermal insulation materials 3c and 3d are cut from the rectangular thermal insulation material, and therefore, in this respect, the thermal insulation materials can be used without waste.

[0034] Figure 6 shows a schematic diagram of the insulating material used when attaching insulating material to a bent portion of a rectangular duct using the method shown in Figures 3 and 5. As shown in Figure 6, when attaching insulating material to a bent portion of a rectangular duct using the method shown in Figure 5, four insulating materials are required on each side of cross section BB in Figure 3, for a total of eight insulating materials (3a-d, 3a'-3d'). Note that in Figure 6, the inclined end faces 6 of the insulating material as viewed from above are shown by solid lines, and the inclined end faces 6 facing below are shown by dashed lines.

[0035] In each of the insulating materials shown in Figure 6, the insulating materials 3a and 3a', 3b and 3b', 3c and 3c', and 3d and 3d' shown at the top and bottom of Figure 6 correspond to the remaining portions when one portion is cut from a rectangular insulating sheet. Therefore, by cutting a given insulating sheet material at an angle (θ) relative to its surface 9, it is possible to simultaneously form the inclined end faces 6 of the insulating materials 3a and 3a' (insulating materials 3b and 3b'), each inclined at the angle (θ). Similarly, by cutting a given insulating sheet material perpendicular to its surface 9, it is possible to simultaneously form the non-parallel end faces 10 of the insulating materials 3c and 3c' (insulating materials 3d and 3d'). This allows for the efficient use of the insulating sheet as the base material, and for each insulating material to be efficiently formed and attached to the bent portion of the duct through a simple cutting process.

[0036] Furthermore, by making the lengths (lengths in the direction of cutting when forming end faces 6, 10) of each rectangular insulating sheet cut into insulating materials 3a and 3a', 3b and 3b', 3c and 3c', and 3d and 3d' the same, it is possible to align end face 13 in Figure 3(a) in a plane perpendicular to the extension direction of the duct, making it easier to connect to insulating material that is added by wrapping rectangular insulating material around the straight part of the duct, for example.

[0037] Figure 7 shows a schematic diagram of the insulating materials 3d and 3b' when they are connected to one another. Figure 7(a) shows the insulating materials 3d and 3b' formed in the same manner as in Figure 6. In particular, at the butt joint between the insulating materials 3d and 3b', the insulating material 3d can be extended beyond the corresponding duct dimension (P) by the thickness (t) of the insulating material 3b', thereby covering the end of the insulating material 3b' as shown in Figure 5(a). On the other hand, when the corner of a rectangular duct is covered with the insulating materials 3d and 3b', the end of the insulating material 3d is exposed to the outside (exposed portion 21 in Figure 5(a)). This can cause problems, such as a reduction in the insulating properties of the insulating material 3d due to contamination if the inside of the insulating material 3d is porous.

[0038] In contrast to the above, as shown in Figure 7(b), by connecting insulating materials corresponding to insulating materials 3d and 3b' with a V-shaped groove 12 with a bottom angle of approximately 90 degrees to form insulating member 31, the insulating member can be attached by wrapping it around the rectangular duct while being bent by the V-shaped groove 12, making it possible to effectively cover multiple surfaces of the rectangular duct and the corners sandwiched between these surfaces with a single insulating member. Furthermore, particularly when an insulating sheet material with a dense skin layer on the surface is used as insulating member 31, the edges of the insulating material are not exposed to the outside by leaving the skin layer on the bottom 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 description, a component including multiple insulating materials connected by V-shaped grooves may be referred to as an "insulating component" to distinguish it from insulating materials attached to a single surface.

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

[0040] The V-groove of the heat insulating member 31 has two inclined surfaces, the width of which, projected onto the surface of the heat insulating member 31, is approximately the same as the thickness of the heat insulating member, and these surfaces face each other at approximately right angles. By bending the heat insulating member 31 along the V-groove, the portions corresponding to the heat insulating members 3d and 3b' can be arranged at right angles to each other. When using the heat insulating member 31 shown in Figure 7(b), it is possible to cover the entire periphery of a rectangular duct by also using heat insulating members corresponding to the heat insulating members 3c and 3a in Figure 6, or by using heat insulating members in which the heat insulating members 3c and 3a are connected to each other via the V-groove 12, or by using heat insulating members to cover the surfaces not covered by the heat insulating member 31 shown in Figure 7(b).

[0041] When using a thermal insulation material such as foam rubber conforming to JIS A9516, the thickness of the thermal insulation material remaining at the bottom of the V-shaped groove 12 can be set to 5 to 20%, 7 to 15%, or preferably 8 to 12% of the thickness of the thermal insulation material before processing, allowing the thermal insulation member 31 to be folded smoothly around the corners of the duct. When using a thermal insulation material with strong shape retention, the thickness of the thermal insulation material remaining at the bottom of the V-shaped groove 12 can be set to approximately 1 to 3 mm to ensure bendability. Furthermore, by attaching an appropriate adhesive sheet to the backside of the surface on which the V-shaped groove is provided, the strength of the thermal insulation member 31 can be maintained even when the thickness of the thermal insulation material remaining at the bottom of the V-shaped groove is further reduced.

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

[0043] Similarly, when describing something as approximately right angled, approximately parallel, etc., as described above, or when describing the angle (θ), etc., it is not necessary for it to be mathematically precise, and it is possible to include various processing errors, etc., as long as they are within a range that does not create gaps that would be problematic when the insulating member of the present invention is attached to a duct, etc.

[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 are connected via a V-shaped groove 12, but the present invention is not limited to this, and the insulating member can be made in which three or four insulating materials selected from insulating materials corresponding to insulating materials 3a, b', c, and d (or insulating materials 3a', b, c', and d') shown in Figure 6 are connected to each other via a V-shaped groove 12 in the order shown in Figure 6.

[0045] That is, the heat insulating member according to the present invention can be configured in such a manner that a heat insulating material having non-parallel end faces 10 (for example, heat insulating materials 3c and 3d in FIG. 6) is used as a base and heat insulating materials having inclined end faces 6 (for example, heat insulating materials 3a and 3b' in FIG. 6) are connected to both sides of the base via V-grooves 12, or in such a manner that a heat insulating material having inclined end faces 6 is used as a base and heat insulating materials having non-parallel end faces 10 are connected to both sides of the base via V-grooves 12, with the first to third heat insulating materials being connected to each other via two V-grooves. Furthermore, it is also possible to configure a configuration in which four heat insulating materials corresponding to heat insulating materials 3a, b', c, and d (heat insulating materials 3a', b, c', and d') shown in FIG. 6 are connected via V-grooves. By limiting the number of insulating materials contained in one insulating member to three or four, it is possible to reduce the amount of work required to install the insulating member. In particular, by using an insulating member that includes insulating materials corresponding to insulating materials 3a, b', c, and d (or insulating materials 3a', b, c', and d') shown in Figure 6 as the first to fourth insulating materials, the installation of the insulating material can be completed by wrapping the insulating material around each part of the elbow member, in the same way as wrapping rectangular insulating material around a straight duct member.

[0046] Figure 8 shows, as an example of a heat insulating member according to the present invention, a heat insulating member 32 (heat insulating member 33) formed by connecting heat insulating members corresponding to the heat insulating members 3a, b', c, and d (heat insulating members 3a', b, c', and d') shown in Figure 6 via V-shaped grooves. The heat insulating member 32 shown in Figure 8 corresponds to a structure in which first to fourth heat insulating members are connected to each other via three V-shaped grooves. The insulating members 32 and 33 shown in Figure 8 have end portions 13 at both ends of the insulating member that are inclined at an angle of 45 degrees relative to the surface, and when the insulating members 32 and 33 are used to cover a duct with external dimensions of P x Q, the inclined portions 12 are butted together to form an excellent insulating layer.

[0047] Figure 9 shows a schematic diagram of the heat insulating member 32 (33) shown in Figure 8 attached to and covering a duct 2. As shown in Figure 9, the heat insulating member according to the present invention can be easily used to cover a duct by cutting a predetermined heat insulating member from a heat insulating sheet material in advance based on the outer dimensions of the duct to which the heat insulating member is attached and the bending angle of the portion where the duct is bent.

[0048] FIG. 10 shows a schematic diagram of the shape of the connection of the insulating member according to the present invention when covering a duct with the insulating member according to the present invention. When wrapping the insulating member shown in FIG. 8 or the like to cover the outer surface of a duct, it is necessary to form a butt joint 22 by butting the end portions 13 of the insulating member together when forming the insulating member into a ring shape. The butt joint 22 can be formed by butting end portions 13 inclined at a 45-degree angle as shown in FIG. 9 ( FIG. 10(a) ), or by forming end portions perpendicular to the surface ( FIG. 10(b) ). This reduces the number of thin areas of the insulating material and increases its strength. Furthermore, as shown in FIG. 9(c) , by providing irregularities on the inner surface of the end portions 13 to increase the area of ​​the butt joint 22, the adhesive strength of the butt joint 22 can be increased when bonding with an adhesive or the like. Furthermore, as shown in FIG. 9(d) , it is possible to provide irregularities on the butt joint surface of the insulating material and conceal the end face of the insulating material.

[0049] Figure 11 shows a schematic diagram of another form of the connection of the insulating member when the insulating member according to the present invention is used to cover a duct. In addition to increasing the area of ​​the butt joint 22 by providing irregularities inside the surface constituting the end portion 13 of the insulating member as shown in Figure 10, it is also possible to introduce an interlocking structure 14 that allows the end portions 13 of the butted insulating members to fit together, as shown in Figure 11. By introducing this interlocking structure 14 to reduce the degree of freedom between the butted insulating members, the inclined end faces 6 and non-parallel end faces 10 of the insulating members can be easily maintained in the same plane, improving the strength of the insulating member and making it less likely that gaps will form between the insulating members.

[0050] Figure 12 shows a schematic diagram of another example of a heat insulating member according to the present invention. As shown in Figure 12, by providing the end of a heat insulating member formed by connecting individual heat insulating materials inside a predetermined heat insulating material (heat insulating material 3c in Figure 12), it is possible to provide a butt joint 22 of the heat insulating member on the surface of the duct. This structure reduces the load on the butt joint 22 compared to when the butt joint 22 is provided at the corner of the duct, and a highly durable heat insulating layer can be provided. The heat insulating member 32' shown in Figure 12 corresponds to a structure in which first to fifth heat insulating materials are connected to each other via four V-shaped grooves.

[0051] The butt joint 22 can be positioned inside a heat insulating material having non-parallel end faces 10 as shown in FIG. 12, or inside a heat insulating material having inclined end faces 6. FIG. 13 shows a schematic diagram of the structure of the butt joint 22 of the insulating member when it is provided on the surface of the duct. The end portion of the insulating member that forms the butt joint 22 of the insulating member can be configured with an end face (flat surface) perpendicular to the surface of the insulating material 3c, 3c" etc., as shown in FIG. 13(a). Alternatively, as shown in FIG. 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 faces 10 of the insulating material can be well maintained, preventing gaps etc. from occurring between the insulating materials.

[0052] By using the insulating members 32 and 33 shown in Fig. 8 and attaching the insulating members to both sides of a bent portion of a rectangular duct having external dimensions P x Q at an angle of 2θ, the insulating members can be attached without creating gaps 20 between the insulating members. For example, when attempting to configure an elbow member that is bent at an angle of 90 degrees overall with a single bend as shown in Fig. 1(a), the bend can be covered without gaps by using insulating members 32 and 33 with θ = 45 degrees in Fig. 8.

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

[0054] Table 1 shows, as examples of the angle (θ) in Figure 8, values ​​of the angle (θ) in Figure 8 when an elbow member that is bent at an overall angle of 90 degrees is to be constructed with one to four bends of equal angle. Even when the bending angle required for the elbow member is other than 90 degrees, it is possible to determine the value of the angle (θ) in Figure 8 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 insulating members 32, 33 in advance based on that angle, etc., it is possible to efficiently attach insulating material to duct members.

[0055] [Table 1]

[0056] Figure 14 shows a schematic diagram of another example of a heat insulating member attached to a bent portion of a duct. Heat insulating members 32, 34, and 35 shown in Figure 14 can be preferably used when attached to an elbow member having two bent portions with equal bending angles as shown in Figure 1(b). Compared to the insulating member 33 in FIG. 8, the insulating member 34 in FIG. 14 has its inclined end face 6 and non-parallel end face 10 arranged symmetrically in the vertical direction in the figure. The insulating member 35 in FIG. 14 has a shape that is symmetrical in the vertical direction to the insulating member 32 in the figure. In other words, the insulating member shown in FIG. 14 is equivalent to a set of insulating members shown in FIG. 8 joined to another set of insulating members that has a shape symmetrical in the vertical direction to the set of insulating members. Furthermore, by using the insulating member 34, it is possible to cover the portion sandwiched between two bent portions by wrapping one insulating member around it, making it easy to cover elbow members with complex shapes.

[0057] The set of insulating members shown in Figure 14 is an example of insulating material attached to an elbow member having two bends with equal bending angles, but the present invention is not limited to this. By pre-forming insulating members in a shape that matches the number of bends included in the elbow member and the spacing between the bends and using these, it is possible to efficiently cover elbow members having any number of bends with insulating material.

[0058] FIG. 15 shows an example of an embodiment of a heat insulating member (heat insulating sheet) according to the present invention. As shown in FIGS. 8 and 14, when heat insulating members 32, 33 (or heat insulating members 32, 34, 35) are unfolded and arranged flat, they can share all of their inclined end faces 6 and non-parallel end faces 10 with other heat insulating members. This means that when heat insulating members 32, 33 shown in FIG. 8 are cut from a single rectangular heat insulating sheet material to form heat insulating member 31, heat insulating member 32 can be formed at the same time. As shown in FIG. 14, heat insulating member 34 can be formed by cutting out heat insulating members 32, 35 from a single rectangular heat insulating sheet material.

[0059] By utilizing the above relationship, it is possible to prepare in advance the insulating materials 32 and 33 in Figure 8 as insulating sheet 36 in Figure 15(a), and the insulating materials 32, 34, and 35 in Figure 14 as insulating sheet 37 in Figure 15(b), which contain each insulating component inside in a form that allows for easy separation. Also, by preparing an insulating sheet containing various insulating 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 without taking up too much space, and it becomes possible to work efficiently at the site where duct covering work is being carried out.

[0060] As described above, the insulating member etc. according to the present invention can be attached to the surface of an existing elbow member made of a metal plate or the like to form an insulating layer for the elbow member. Meanwhile, in addition to forming an insulating layer on the surface of an existing elbow member, the insulating member etc. according to the present invention can also be used to construct an elbow member using only the insulating member, similar to a typical cardboard duct. In particular, since materials that exhibit insulating properties by having closed cells are not breathable, using an insulating member made of such a material makes it possible to construct an excellent elbow member using only the insulating member.

[0061] 16 is a schematic diagram showing a method for introducing a cutting surface when forming a heat insulating member (heat insulating sheet) according to the present invention by cutting a heat insulating sheet material 38. The heat insulating member according to the present invention can be formed by introducing a cutting surface into a heat insulating sheet material 38 having a predetermined thickness using a blade such as a cutter 39.

[0062] There is no particular limit to the thickness of the insulating sheet material 38 used to form the insulating member of the present invention, and it can be determined appropriately depending on the insulation properties, strength, etc. required for the duct. In the insulating member of the present invention, by including the specified inclined end face 6 in particular, even when a thick insulating sheet material 38 is used, gaps are unlikely to occur between the insulating materials at the bent portion of the duct, allowing for efficient installation work.

[0063] The thickness of the insulating sheet material 38 used to form the insulating member of the present invention is preferably 5 mm or more, and sufficient insulation can be achieved by making it 10 mm or more, or 15 mm or more. Furthermore, using an insulating sheet material 20 mm or more increases the area of ​​the end face of the insulating member, making it easier to bond the insulating members together. For example, when using insulating sheet material made of foam rubber conforming to JIS A9516, the strength of the insulating member can be improved by stacking the sheet material as needed to make the overall thickness 30 mm or more, or 40 mm or more. This allows for the satisfactory formation of duct elbow members and the like using only the insulating member of the present invention.

[0064] The insulating sheet material 38 preferably used to form the insulating member of the present invention may be Aeroflex (registered trademark) or Armaflex (registered trademark) conforming to JIS A9516, or commercially available insulating materials such as Thermobreak (registered trademark) using polyolefin foam, sheet material made from glass wool or rock wool formed into a sheet, polystyrene foam, cardboard, etc., depending on the application, etc.

[0065] When cutting the insulating sheet material 38 to form the insulating sheet 36 shown in Fig. 15(a), for example, it is preferable to use a rectangular insulating sheet material 38 having predetermined dimensions and first introduce cutting surfaces on the surface side of the insulating sheet material 38 to remove portions corresponding to the three V-grooves 12 and the two end portions 13. Since the V-grooves 12 and the end portions 13 all form a 45-degree angle with respect to the surface of the insulating sheet material 38, the cutting surfaces can be introduced by inserting a cutter 39 into the surface of the insulating sheet material 38 and moving it at a 45-degree angle, as shown in Fig. 16(c).

[0066] When introducing a cutting surface to cut off the portion corresponding to the V-shaped groove 12, the cutting surface can be introduced by inserting cutter 39 at the 45-degree angle from both sides of the V-shaped groove 12 and moving it in the extension direction of the V-shaped groove 12. In this case, the cutting edge of cutter 39 does not penetrate the heat insulating sheet material 38, and the cutting surfaces introduced from both sides intersect inside the heat insulating sheet material 38, so that the heat insulating materials can be connected via the V-shaped groove 12.

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

[0068] When introducing the cut surfaces that result in the inclined end surface 6 and the non-parallel end surface 10, the cutter 39 moves through the insulating sheet material 38, thereby separating each insulating component from the insulating sheet material 38. By appropriately leaving "uncut" areas where the cutter 39 does not penetrate the insulating sheet material 38, the insulating components contained in the insulating sheet material 38 are continuous at those areas, allowing the shape of the insulating sheet material 38 to be maintained even when the predetermined cut surface is introduced. Pre-cutting the insulating sheet material 38, in which the insulating components can be easily separated, makes the insulating sheet material 38 easier to handle during pre-manufacturing, storage, distribution, etc., while also enabling efficient duct installation work by separating the insulating components from the insulating sheet material 38 at the construction site.

[0069] The work of introducing a cut surface into the heat insulating sheet material 38 with the cutter 39 can be done manually using various rulers, etc. Alternatively, by using a cutting device that holds and moves the blade of the cutter 39 so that it can vibrate at high speed, and by inserting the blade of the cutter 39 into the surface of the heat insulating sheet material 38 at the angle shown in Figure 16 to introduce the cut surface, it becomes possible to form the heat insulating member accurately and efficiently. [Industrial Applicability]

[0070] The heat insulating member according to the present invention allows efficient installation of heat insulating material on the elbow member of a rectangular duct. Alternatively, by forming the elbow member of a rectangular duct using the heat insulating member according to the present invention, the elbow member of the rectangular duct can be installed efficiently. [Explanation of symbols]

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

Claims

1. A heat insulating member including a first heat insulating material having a substantially uniform thickness and a second heat insulating material having a substantially uniform thickness connected to the first heat insulating material via a first V-shaped groove having a base angle substantially perpendicular to the first heat insulating material, the first insulating material has a first non-parallel end surface that is substantially perpendicular to a surface of the insulating material and whose normal is non-parallel and non-perpendicular to the extension direction of the first V-shaped groove; the second insulating material has a first inclined end surface whose normal is not parallel to the extension direction of the first V-shaped groove; An insulating sheet characterized by including at least two insulating members in which, when the first insulating material and the second insulating material are arranged at approximately right angles by folding along the first V-groove, the first non-parallel end face and the first inclined end face exist in a common plane.

2. the first insulating material has second non-parallel end faces, and the second insulating material has second inclined end faces; The insulating sheet described in claim 1, characterized in that it includes an insulating element in which, when the first insulating material and the second insulating material are arranged at approximately right angles by folding along the first V-shaped groove, the second non-parallel end face and the second inclined end face exist in a common plane.

3. The heat insulating material further includes a third heat insulating material having a substantially uniform thickness and connected to the first heat insulating material via a second V-shaped groove having a base angle substantially perpendicular to the third heat insulating material, the extension direction of the second V-groove is approximately parallel to the extension direction of the first V-groove; the third insulating material has a third inclined end surface whose normal is not parallel to the extension direction of the first V-shaped groove; The insulating sheet described in claim 1, characterized in that it includes an insulating element in which the first non-parallel end face and the third inclined end face exist in a common plane when the first insulating material and the third insulating material are arranged approximately perpendicularly by folding along the second V-groove.

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 insulating sheet described in claim 3, characterized in that when the third insulating material is positioned approximately perpendicular to the first insulating material by folding 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 heat insulating material further includes a third heat insulating material having a substantially uniform thickness and connected to the first heat insulating material via a second V-shaped groove having a base angle of substantially right angles, and a fourth heat insulating material having a substantially uniform thickness and connected to the third heat insulating material via a third V-shaped groove having a base angle of substantially right angles, the extension direction of the second and third V-grooves is approximately parallel to the extension direction of the first V-groove; the third insulating material has a third inclined end surface whose normal is non-parallel to the extension direction of the first V-shaped groove, and the fourth insulating material has a third non-parallel end surface whose normal is non-parallel to the extension direction of the first V-shaped groove; The insulating sheet described in claim 1, characterized in that the insulating sheet includes an insulating member in which the first insulating material is approximately perpendicular to the third insulating material by being folded along the second and third V-grooves, and when arranged approximately parallel to the fourth insulating material, the first non-parallel end face, the third inclined end face and the third non-parallel end face exist 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 insulating sheet described in claim 5, characterized in that the insulating member is folded along the second and third V-grooves so that the first insulating material is approximately perpendicular to the third insulating material, and when arranged approximately parallel to the fourth insulating 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 insulating material having a substantially uniform thickness and connected to the first insulating material via a second V-groove having a base angle substantially perpendicular to the first insulating material, a fourth insulating material having a substantially uniform thickness and connected to the third insulating material via a third V-groove having a base angle substantially perpendicular to the first insulating material, and a fifth insulating material having a substantially uniform thickness and connected to the fourth insulating material via a fourth V-groove having a base angle substantially perpendicular to the first insulating material, the extension directions of the second to fourth V-shaped grooves are all substantially parallel to the extension direction of the first V-shaped groove, the distance between the first V-shaped groove and the second V-shaped groove is substantially 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 non-parallel to the extension direction of the second V-groove, the fourth insulating material has a third non-parallel end face whose normal is non-parallel to the extension direction of the first V-groove, and the fifth insulating material has a fifth inclined end face whose normal is non-parallel to the extension direction of the first V-groove; The heat insulating sheet of claim 1, characterized in that the first heat insulating material is folded along the second to fourth V-grooves so that it is approximately perpendicular to the third and fifth heat insulating materials, and when arranged approximately parallel to the fourth heat insulating material, the first non-parallel end face, the third inclined end face, the third non-parallel end face and the fifth inclined 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 heat insulating sheet of claim 7, characterized in that the first insulating material is folded along the first to fourth V-grooves so that it is approximately perpendicular to the second, third, and fifth insulating materials, and when arranged approximately parallel to the fourth insulating material, the second non-parallel end face, the second inclined 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 as described in any one of claims 1 to 8, characterized in that at least one of the non-parallel end faces or inclined end faces of two insulating members included adjacent to the insulating sheet is formed simultaneously by introducing a cut surface into the insulating sheet.

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