Heat insulating material fixing structure, retainer, and retainer manufacturing method

Abstract

To provide a heat insulating material fixing structure, a retainer, and a method for manufacturing the retainer, which have excellent maintainability inside a furnace and low manufacturing costs. [Solution] An insulation material fixing structure for fixing insulation material 4 to a furnace 10, comprising an outer skin 2 on the outside of the furnace, a furnace wall 3 on the inside of the furnace, insulation material 4 arranged between the outer skin 2 and the furnace wall 3, stud bolts 5 fixed to the outer skin 2, and a retainer 6 abutting the furnace wall 3, the retainer 6 having a through hole 61 formed in a plate member, and a peripheral portion 62 of the through hole 61 protruding from the inside of the furnace toward the outside of the furnace, and the peripheral portion 62 being welded to the stud bolts 5, thereby fixing the insulation material 4 between the outer skin 2 and the furnace wall 3.

Description

[Technical Field]

[0001] The present invention relates to a heat insulating material fixing structure for fixing a heat insulating material to a furnace, a retainer used therein, and a method for manufacturing the retainer. [Background technology]

[0002] Conventionally, when installing heat insulating material in a furnace, for example, as shown in Patent Document 1, the heat insulating material is placed between the outer skin and the furnace wall of the furnace, and the heat insulating material is fixed between the outer skin and the furnace wall with stud bolts fixed to the outer skin and nuts and washers on the inside of the furnace; or as shown in Patent Document 2, the heat insulating material is placed between the outer skin and the furnace wall, and the outer skin, heat insulating material, and furnace wall are fixed from both sides with stud bolts and nuts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-190516 [Patent Document 2] Japanese Patent Application Publication No. 8-121733 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when fixing the heat insulating material as described above, nuts are required, and turning the bolt to fix the material while holding down the washer and heat insulating material so as not to drop the small nut is not preferable in terms of workability. Also, the bolts and nuts protrude into the furnace, which hinders work and reduces the ease of maintenance inside the furnace.

[0005] Therefore, an object of the present invention is to provide a heat insulating material fixing structure, a retainer, and a method of manufacturing a retainer that are easy to maintain inside a furnace and have low manufacturing costs. [Means for solving the problem]

[0006] The present invention provides a heat insulating material fixing structure for fixing a heat insulating material to a furnace, The outer shell of the furnace; The furnace wall inside the furnace, a heat insulating material disposed between the outer shell and the furnace wall; a stud bolt fixed to the outer shell; a retainer that abuts against the furnace wall, The retainer has a plate member having a through hole formed therein, The peripheral portion of the through hole protrudes from the inside of the furnace toward the outside of the furnace, The peripheral edge is welded to the stud bolts, thereby fixing the heat insulating material between the outer shell and the furnace wall.

[0007] According to the above configuration, the peripheral portion of the through hole of the retainer protrudes toward the outside of the furnace, and the peripheral portion is welded to the stud bolt, so nuts for fixing the stud bolt are not required, and since it is only necessary to make the peripheral portion of the through hole protrude toward the outside of the furnace, the manufacturing cost of the retainer can be reduced. Therefore, it is possible to provide a heat insulating material fixing structure that is easy to maintain inside the furnace and has low manufacturing costs. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a heat insulating material fixing structure, a retainer, and a method of manufacturing a retainer that are easy to maintain inside a furnace and have low manufacturing costs. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a partial schematic cross-sectional view of a furnace equipped with an insulating material fixing structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of FIG. [Figure 3] FIG. [Figure 4] 5A to 5C are schematic diagrams illustrating a method for manufacturing and attaching the retainer. [Figure 5]5A to 5C are schematic diagrams illustrating a method for manufacturing and attaching the retainer. [Figure 6] 5A to 5C are schematic diagrams illustrating a method for manufacturing and attaching the retainer. [Figure 7] 5A to 5C are schematic diagrams illustrating a method for manufacturing and attaching the retainer. [Figure 8] 5A to 5C are schematic diagrams illustrating a method for manufacturing and attaching the retainer. DETAILED DESCRIPTION OF THE INVENTION

[0010] Fig. 1 is a partial schematic cross-sectional view of a furnace 10 equipped with an insulating material fixing structure according to an embodiment of the present invention, and Fig. 2 is an enlarged view of Fig. 1. As shown in Figs. 1 and 2, the furnace 10 is a heat treatment furnace for heat treating materials to be treated, and the furnace body 11 includes a metal outer shell 2 located on the outside of the furnace, a thin furnace wall 3 located on the inside of the furnace, and insulating material 4 disposed between the outer shell 2 and the furnace wall 3. Stud bolts 5 are fixed to the outer shell 2 by welding, and the insulating material 4 is fixed between the outer shell 2 and the furnace wall 3 by the stud bolts 5 and retainers 6 fixed to the stud bolts 5.

[0011] 3 is a schematic diagram of the retainer 6. As shown in FIGS. 2 and 3, the retainer 6 has a through hole 61 formed in a plate member, and a peripheral edge 62 of the through hole 61 is subjected to stress so as to expand the through hole 61 from the inside of the furnace toward the outside of the furnace, and the peripheral edge 62 protrudes in the direction in which the stress is applied (toward the outside of the furnace when viewed from the installed state of the retainer 6). In addition, an outer peripheral portion 63 of the retainer 6 is adapted to abut against the furnace wall 3 when the retainer 6 is fixed to the stud bolts 5. Here, the plate member used for the retainer 6 is made of, for example, metal.

[0012] A thread 62b is formed on the inner wall 62a of the peripheral portion 62 of the retainer 6, and the thread 62b engages with a thread 5a formed on the stud bolt 5, thereby causing the retainer 6 to tighten the stud bolt 5, generating a tightening force between the retainer 6 and the outer shell 2.

[0013] Four notches 63a are formed evenly in the circumferential direction on the outer periphery 63 of the retainer 6, and the notches 63a have a rectangular recessed shape that extends radially inward. By using the notches 63a, for example, by hooking a tool or finger into the notches 63a, the retainer 6 can be easily rotated relative to the stud bolt 5.

[0014] (Retainer manufacturing and installation method) 4 to 8 and 2 are schematic diagrams illustrating a method for manufacturing and attaching the retainer 6. First, as shown in Fig. 4, a through hole 61 is formed in the center of a plate-like member. The diameter of the through hole 61 is set to about half the outer diameter of the stud bolt 5.

[0015] Next, as shown in Figure 5, a rod 9 with a tapered tip is inserted into the through hole 61 to enlarge the diameter of the through hole 61. The outer diameter of the rod 9 is set to be slightly smaller than the root diameter of the thread of the stud bolt 5. The expansion rate of the diameter of the through hole 61 due to the insertion of the rod 9 is about 1.4 to 1.8 times.

[0016] 6, as the diameter of through-hole 61 expands due to the insertion of rod 9, peripheral edge 62 of through-hole 61 deforms so as to protrude in the insertion direction of rod 9. The protruding length of peripheral edge 62 is approximately 10 to 15% of the outer diameter of retainer 6.

[0017] As shown in FIG. 7, a thread 62b is formed on an inner wall 62a of a peripheral portion 62 of the through-hole 61.

[0018] As shown in Figure 8, the peripheral edge 62 of the through hole 61 of the retainer 6 is positioned relative to the stud bolt 5. The threads 5a of the stud bolt 5 are engaged with the threads 62b on the inner wall 62a of the peripheral edge 62, and the retainer 6 is rotated relative to the stud bolt 5, thereby tightening the stud bolt 5 with the retainer 6. Once tightening is complete, the tip of the threads 5a of the stud bolt 5 is welded to the inner wall 62a of the peripheral edge 62 of the retainer 6. This allows the retainer 6, which has a flat surface, to be fixed by welding, eliminating protrusions in the furnace that would occur when conventional nuts are used for fastening, improving maintainability. Furthermore, because the threads 62b are on the retainer 6 itself, the retainer 6 can be tightened to the stud bolt 5 without the need for nuts, improving workability. However, this alone may cause the screws to gradually loosen due to vibrations during furnace operation, causing the retainer 6 to come off, so it is preferable to join the tip of the thread 5a side of the stud bolt 5 and the inner wall 62a of the peripheral portion 62 of the retainer 6 by welding.

[0019] By welding the retainer 6 and the stud bolt 5 together, the retainer 6 abuts against the furnace wall 3 as shown in Figure 2, and as a result, the insulation material 4 is fixed between the outer shell 2 and the furnace wall 3 by the stud bolt 5 and the retainer 6.

[0020] The heat insulating material fixing structure, the retainer, and the method for manufacturing the retainer having the above-described configuration can provide the following effects.

[0021] (1) In the retainer 6, the peripheral portion 62 of the through hole 61 protrudes toward the outside of the furnace, and the peripheral portion 62 is welded to the stud bolt 5, so nuts for fixing the stud bolt 5 are not required, and the manufacturing cost of the retainer 6 can be reduced because the peripheral portion 62 of the through hole 61 simply protrudes toward the outside of the furnace. Therefore, it is possible to provide a heat insulating material fixing structure that is easy to maintain inside the furnace and has low manufacturing costs.

[0022] (2) The retainer 6 has an inner wall 62a at its peripheral edge 62 formed with threads 62b, so that the retainer 6 can easily tighten the stud bolt 5.

[0023] (3) The outer peripheral portion 63 of the retainer 6 has a notch 63a formed therein, which allows the retainer 6 to be easily rotated relative to the stud bolt 5, facilitating threaded engagement between the retainer 6 and the stud bolt 5.

[0024] (4) The retainer 6 has a shape that allows the peripheral edge 62 of the through-hole 61 to protrude without bending or pressing a plate material. Therefore, the retainer 6 can be manufactured at low cost.

[0025] (5) The retainer 6 can be manufactured by expanding the through-hole 61 and protruding the peripheral edge 62 without bending or pressing a plate material, so that the retainer 6 can be manufactured at low manufacturing costs.

[0026] In this embodiment, the furnace 10 is a heat treatment furnace for heat treating the material to be treated, but the furnace 10 is not limited to a heat treatment furnace, and the present invention can be applied to various industrial furnaces having thermal insulation.

[0027] In this embodiment, the outer periphery of the retainer 6 has a circular shape, but it may also have an elliptical shape, or may have a polygonal or rectangular shape.

[0028] In this embodiment, four notches 63a are formed evenly spaced in the circumferential direction, but the number of notches 63a is not limited to four and may be one or more. Furthermore, although the notches 63a have a rectangular shape recessed radially inward, they may also have a circular or elliptical shape recessed radially inward.

[0029] The present invention and embodiments can be summarized as follows.

[0030] (1) One embodiment of the present invention is a heat insulating material fixing structure for fixing a heat insulating material to a furnace, The outer shell of the furnace; The furnace wall inside the furnace, a heat insulating material disposed between the outer shell and the furnace wall; a stud bolt fixed to the outer shell; a retainer that abuts against the furnace wall, The retainer has a plate member having a through hole formed therein, The peripheral portion of the through hole protrudes from the inside of the furnace toward the outside of the furnace, The peripheral edge is welded to the stud bolts, thereby fixing the heat insulating material between the outer shell and the furnace wall.

[0031] According to the above-mentioned configuration (1), the peripheral portion of the through hole of the retainer protrudes toward the outside of the furnace, and the peripheral portion is welded to the stud bolt, so nuts for fixing the stud bolt are not required, and since it is only necessary to make the peripheral portion of the through hole protrude toward the outside of the furnace, the manufacturing cost of the retainer can be reduced. Therefore, it is possible to provide a heat insulating material fixing structure that is easy to maintain inside the furnace and has low manufacturing costs.

[0032] (2) In the above configuration (1), a thread is formed on the inner wall of the peripheral edge of the retainer.

[0033] According to the above configuration (2), the stud bolt can be easily tightened by the retainer.

[0034] (3) In the configuration (2), a notch is formed in the outer periphery of the retainer.

[0035] According to the above configuration (3), the retainer can be easily rotated relative to the stud bolt using the notch, and the retainer and the stud bolt can be easily threadedly engaged with each other.

[0036] (4) Another embodiment of the present invention is a retainer that is fixed to a stud bolt fixed to an outer shell of a furnace and fixes a heat insulating material between a furnace wall and the outer shell, The retainer has a plate member having a through hole formed therein, The peripheral portion of the through hole protrudes from the inside of the furnace toward the outside of the furnace, The inner wall of the peripheral portion is threaded.

[0037] According to the above-mentioned configuration (4), nuts for fixing the stud bolts are not required, and the retainer has a shape that protrudes the peripheral edge of the through hole without bending or pressing a plate material. Therefore, it is possible to provide a retainer that is easy to maintain inside the furnace and has low manufacturing costs.

[0038] (5) In the above configuration (4), a notch is formed in the outer periphery of the retainer.

[0039] According to the above configuration (5), the retainer can be easily rotated relative to the stud bolt using the notch, and the retainer and the stud bolt can be easily threadedly engaged with each other.

[0040] (6) Yet another embodiment of the present invention is a method for manufacturing a retainer that is fixed to a stud bolt fixed to an outer shell of a furnace and that fixes a heat insulating material between a furnace wall and the outer shell, the method comprising the steps of: A through hole is formed in the plate member, Stress is applied to the peripheral portion of the through hole so as to expand the through hole from the inside of the furnace toward the outside of the furnace, causing the through hole to protrude toward the outside of the furnace; Threads are formed on the inner wall of the peripheral edge.

[0041] According to the configuration (6), nuts for fixing the stud bolts are not required, and the retainer can be manufactured by expanding the through hole and protruding the peripheral edge without bending or pressing the plate material, so that the retainer has excellent maintainability inside the furnace and can be manufactured at low manufacturing costs.

[0042] (7) In the above configuration (6), a notch is formed in the outer periphery of the retainer.

[0043] According to the above configuration (7), the retainer can be easily rotated relative to the stud bolt using the notch, and the retainer and the stud bolt can be easily threadedly engaged with each other.

[0044] Various modifications and variations may be made without departing from the spirit and scope of the present invention as set forth in the following claims. [Industrial Applicability]

[0045] The present invention can provide a heat insulating material fixing structure, a retainer, and a method for manufacturing a retainer that are easy to maintain inside a furnace and have low manufacturing costs, and therefore has great industrial applicability. [Explanation of symbols]

[0046] 10 furnace 11 Furnace body 2 Hull 3 Furnace wall 4. Insulation 5 stud bolts 5a screws 6 Retainer 61 Through hole 62 peripheral portion 62a inner wall 62b screw 63 Outer periphery 63a Notch 9 bars

Claims

1. A heat insulating material fixing structure for fixing a heat insulating material to a furnace, The outer shell of the furnace; The furnace wall inside the furnace, a heat insulating material disposed between the outer shell and the furnace wall; a stud bolt fixed to the outer shell; a retainer that abuts against the furnace wall, The retainer has a plate member having a through hole formed therein, The peripheral portion of the through hole protrudes from the inside of the furnace toward the outside of the furnace, The heat insulating material fixing structure is configured so that the heat insulating material is fixed between the outer shell and the furnace wall by welding the peripheral edge portion to the stud bolt.

2. The heat insulating material fixing structure according to claim 1 , wherein a thread is formed on the inner wall of the peripheral edge of the retainer.

3. 3. The heat insulating material fixing structure according to claim 2, wherein a notch is formed in the outer periphery of said retainer.

4. A method for manufacturing a retainer that is fixed to a stud bolt fixed to an outer shell of a furnace and that fixes a heat insulating material between a furnace wall and the outer shell, comprising: A through hole is formed in the plate member, Stress is applied to the peripheral portion of the through hole so as to expand the through hole from the inside of the furnace toward the outside of the furnace, causing the through hole to protrude toward the outside of the furnace; A method for manufacturing a retainer, comprising forming a thread on the inner wall of the peripheral edge portion.

5. The method for manufacturing a retainer according to claim 4 , further comprising forming a notch in the outer periphery of the retainer.

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