Combustion chambers, boilers and water heaters

Abstract

To provide a combustion chamber which can restrain corrosion of a tool for fixing a thermal insulation material, and is excellent in maintainability.SOLUTION: A combustion chamber includes a metal container, a plate-like thermal insulation material containing inorganic fiber and arranged so as to be brought into contact with an inner wall surface of the metal container, and a rod-like member and a fixing member for fixing the plate-like thermal insulation material onto the inner wall surface of the metal container. The plate-like thermal insulation material has the metal container side as a bottom, and has a bottomed hole provided along a thickness direction of the plate-like thermal insulation material, and a through hole is formed on a bottom surface of the bottomed hole so that the rod-like member goes therethrough. One end of the rod-like member is fixed to the metal container, and the other end thereof is fixed to the fixing member arranged inside the bottomed hole. In a plane perpendicular to a longitudinal direction of the rod-like member, the fixing member has a shape not passing through the through hole, and an opening of the bottomed hole is covered with a heat-resistant material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a combustion chamber, a boiler, and a water heater. [Background technology]

[0002] 2. Description of the Related Art Boilers and water heaters are used as devices that supply steam or hot water using fuels such as petroleum.

[0003] Boilers and water heaters burn fuel in a combustion chamber and transfer the combustion heat to water through water pipes arranged in the combustion chamber, thereby generating steam or hot water from water.

[0004] Because the combustion chamber reaches high temperatures, it is usually protected by refractories and heat insulating materials in order to protect surrounding equipment from heat damage and to reduce energy loss (see, for example, Patent Documents 1 and 2).

[0005] In particular, in combustion chambers where the combustion gases can reach high temperatures, refractories and heat insulating materials are generally made by pouring a fluid containing heat-resistant material onto the surface of the object and solidifying it. Such materials are also called castable materials.

[0006] Castable materials installed on the ceiling side of the combustion chamber may fall due to their weight, so they are sometimes fixed to the combustion chamber using fixing jigs, etc. The fixing jigs used in this case are generally made of metal that can withstand the combustion gases generated in the combustion chamber. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4946594 [Patent Document 2] Patent No. 4640705 Summary of the Invention [Problem to be solved by the invention]

[0008] However, repeated exposure of metal jigs to combustion gases causes corrosion, making maintenance such as jig replacement and repair difficult.

[0009] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a combustion chamber that can suppress corrosion of insulation fixing jigs and is easy to maintain. [Means for solving the problem]

[0010] That is, the combustion chamber of the present invention is a combustion chamber having a metal container, a plate-shaped insulation material containing inorganic fibers arranged so as to contact the inner wall surface of the metal container, and a rod-shaped member and a fixing member for fixing the plate-shaped insulation material to the inner wall surface of the metal container, wherein the plate-shaped insulation material has a bottom surface facing the metal container and has a bottomed hole arranged along the thickness direction of the plate-shaped insulation material, a through hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole, one end of the rod-shaped member is fixed to the metal container arranged inside the bottomed hole and the other end is fixed to the fixing member, in a plane perpendicular to the longitudinal direction of the rod-shaped member, the fixing member has a shape that prevents it from passing through the through hole, and the opening of the bottomed hole is covered with a heat-resistant material.

[0011] The combustion chamber of the present invention includes a rod-shaped member and a fixing member for fixing the plate-shaped insulation to the inner wall surface of the metal container. The rod-shaped member penetrates the bottom surface of the bottomed hole of the plate-shaped insulation, with one end fixed to the metal container and the other end fixed to the fixing member arranged inside the bottomed hole. Therefore, in the combustion chamber of the present invention, the rod-shaped member positions the metal container and the fixing member opposite each other, with the plate-shaped insulation interposed therebetween. The shape of the fixing member in the direction perpendicular to the longitudinal direction of the rod-shaped member is such that it cannot pass through the through hole. Therefore, the fixing member placed inside the bottomed hole of the plate-shaped insulation material can fix the plate-shaped insulation material to the inner wall surface of the metal container. Because the opening of the bottomed hole is covered with a heat-resistant material, the fixing member disposed inside the bottomed hole and the rod-shaped member fixed to the fixing member can be prevented from corroding due to the effects of combustion gases generated inside the metal container, etc., thereby improving maintainability.

[0012] In the combustion chamber of the present invention, the opening of the bottomed hole is preferably filled with the heat-resistant material. If the opening of the bottomed hole is filled with a heat-resistant material, the combustion gas generated inside the metal container can be further prevented from entering the inside of the bottomed hole.

[0013] In the combustion chamber of the present invention, it is preferable that the bottom area of ​​the bottomed hole is larger than the opening area of ​​the bottomed hole, and that the heat-resistant material is filled from the opening to the bottom surface of the bottomed hole. With the above configuration, the heat-resistant material filled from the opening of the bottomed hole to the bottom surface cannot pass through the opening, thereby preventing the heat-resistant material from falling out of the bottomed hole and improving the corrosion resistance of the rod-shaped member and the fixing member.

[0014] In the combustion chamber of the present invention, the heat-resistant material is preferably a first amorphous material containing an inorganic material. When the heat-resistant material is a first amorphous material containing an inorganic material, it is suitable as a material that protects the rod-shaped member and the fixing member from combustion gases, etc. Furthermore, the first amorphous material containing an inorganic material can be easily filled into the bottomed hole, thereby improving workability.

[0015] In the combustion chamber of the present invention, it is preferable that a spiral groove is formed on the surface of the rod-shaped member, and that the rod-shaped member and the fixing member are screwed together to fix the rod-shaped member to the fixing member. With the above-described configuration, the rod-shaped member and the fixing member can be easily fixed together. Furthermore, since the fixing can be easily released, the plate insulation can be easily removed for inspection or replacement, resulting in excellent maintainability.

[0016] In the combustion chamber of the present invention, it is preferable that the rod-shaped member has a protrusion at the tip of the rod-shaped member that protrudes further inside the metal container than the fixing member, and that the protrusion is covered with the heat-resistant material filled in the bottomed hole. With the above configuration, the heat-resistant material covering the protrusion acts as a catch, preventing the heat-resistant material from falling out of the bottomed hole.

[0017] In the combustion chamber of the present invention, the plate-shaped insulating material is preferably a plate-shaped paper product. The sheet-shaped article is obtained by attaching a binder to inorganic fibers in a slurry liquid and then forming the inorganic fibers into a sheet so as to minimize the distribution of the fibers. Such a sheet-shaped article has the property of minimizing the distribution of the inorganic fibers and being resistant to deformation, making it suitable as a plate-shaped insulating material to be placed inside a combustion chamber.

[0018] In the combustion chamber of the present invention, the inorganic fibers preferably include at least one type selected from the group consisting of biosoluble fibers, alumina fibers, rock wool, and glass fibers. When the inorganic fibers contain the above-mentioned materials, a plate-shaped insulating material having excellent heat resistance can be obtained.

[0019] In the combustion chamber of the present invention, the inorganic fibers preferably have an average fiber length of 0.05 to 3.0 mm. When the average fiber length of the inorganic fibers is within the above range, a laminated plate-like molded product can be obtained with little unevenness of the inorganic fibers, and the bulk density and heat insulating properties are stable.

[0020] In the combustion chamber of the present invention, the bulk density of the plate-shaped insulating material is 0.2 to 0.6 g / cm 3 It is preferable that: When the bulk density of the plate-shaped insulating material is within the above range, the increase in weight of the combustion chamber can be suppressed compared to refractory materials and insulating materials using irregularly shaped products.

[0021] In the combustion chamber of the present invention, it is preferable that a recess is provided on the surface of the plate-shaped insulating material facing the metal container. If a recess is provided on the surface of the plate-shaped insulating material facing the metal container, the recess functions as an air layer, thereby improving the insulating properties.

[0022] In the combustion chamber of the present invention, it is preferable that a groove is provided on the surface of the plate-shaped insulating material opposite to the surface on the metal container side. If grooves are provided on the surface of the plate-shaped insulation opposite the surface of the metal container, cracks in the plate-shaped insulation due to thermal contraction can be prevented from occurring on the combustion chamber side surface of the plate-shaped insulation, which is particularly susceptible to heat.

[0023] The combustion chamber of the present invention preferably has a plurality of the rod-shaped members, the plate-shaped insulation material has a plurality of the bottomed holes, the rod-shaped members pass through the through holes in the bottom surfaces of each of the bottomed holes, and the plate-shaped insulation material is fixed to the inner wall surface of the metal container by the fixing members fixed to the other ends of each of the rod-shaped members. With the above configuration, one plate-shaped insulating material can be fixed by a plurality of sets of rod-shaped members and fixing members, thereby improving the stability of fixing the plate-shaped insulating material.

[0024] In the combustion chamber of the present invention, it is preferable that the combustion chamber has a plurality of the rod-shaped members, the plate-shaped insulation material is composed of an aggregate of a plurality of insulation elements containing the inorganic fibers, each of the insulation elements has a bottom surface facing the metal container and a bottomed hole arranged along the thickness direction of the plate-shaped insulation material, the bottom surface of each of the bottomed holes has a through hole formed therein through which the rod-shaped members pass, the rod-shaped members pass through the through holes in the bottom surface of each of the bottomed holes, and each of the insulation elements is fixed to the inner wall surface of the metal container by each of the fixing members fixed to the other end of each of the rod-shaped members. With the above-described configuration, each heat insulating element constituting the plate-shaped heat insulating material can be fixed to the inner wall surface of the metal container by a set of a rod-shaped member and a fixing member.

[0025] In the combustion chamber of the present invention, it is preferable that the plurality of heat insulating elements are in contact with one another without any gaps along the surface direction of the plate-shaped heat insulating material. When two heat insulating elements facing each other in the planar direction are in contact with each other without any gaps, the heat insulating properties of the plate heat insulating material can be improved.

[0026] In the combustion chamber of the present invention, it is preferable that the multiple insulating elements are arranged so that gaps are formed along the surface direction of the plate-shaped insulating material, and that the gaps are filled with a second amorphous material containing an inorganic material. When the second amorphous material is filled in the gap between two heat insulating elements facing each other in the plane direction, it is possible to suppress a decrease in heat insulating performance due to the gap occurring between the heat insulating elements.

[0027] In the combustion chamber of the present invention, the plate-shaped insulating material is disposed on a top surface or a bottom surface of the metal container, It is preferable that a third amorphous material containing an inorganic material is filled between the side surface of the plate-shaped insulating material and the inner surface of the metal container. In some cases, it may be difficult to perfectly adjust the dimensions of the metal container and the plate-shaped insulation material so that no gaps form between them. Even in such cases, if the third amorphous material is filled between the side surface of the plate-shaped insulation material and the inner surface of the metal container as described above, the deterioration of the insulation performance can be suppressed.

[0028] The boiler of the present invention is characterized by including the combustion chamber of the present invention.

[0029] The boiler of the present invention is equipped with the combustion chamber of the present invention, and therefore corrosion of the heat insulating material fixing jig can be suppressed, resulting in good maintainability.

[0030] The water heater of the present invention is characterized by including the combustion chamber of the present invention.

[0031] The water heater of the present invention is equipped with the combustion chamber of the present invention, and therefore corrosion of the heat insulating material fixing jig can be suppressed, resulting in good maintainability. [Brief explanation of the drawings]

[0032] [Figure 1]FIG. 1 is a perspective view schematically showing an example of a combustion chamber according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a perspective view schematically showing an example of a plate-shaped heat insulating material used in the combustion chamber shown in FIGS. [Figure 4] FIG. 4 is a cross-sectional view schematically showing an example of a step of fixing one end of a rod-shaped member to the inner wall surface of a metal container. [Figure 5] FIG. 5 is a cross-sectional view schematically showing an example of a process for arranging plate-shaped insulating materials on the inner wall surface of a metal container. [Figure 6] FIG. 6 is a cross-sectional view schematically showing an example of a step of fixing a fixing member to the other end of the rod-shaped member. [Figure 7] FIG. 7 is a cross-sectional view schematically showing an example of a step of covering the openings of the bottomed holes of the sheet-like article with a heat-resistant material. [Figure 8] FIG. 8 is a perspective view schematically showing another example of a plate-shaped insulating material used in the combustion chamber of the present invention. [Figure 9] FIG. 9 is a perspective view schematically showing yet another example of a plate-shaped insulating material used in a combustion chamber of the present invention. [Figure 10] FIG. 10 is a cross-sectional view that schematically shows an example of a combustion chamber according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view schematically showing an example of a combustion chamber according to a third embodiment of the present invention. [Figure 12] FIG. 12 is a perspective view schematically showing another example of the rod-shaped member and the fixing member. [Figure 13] FIG. 13 is a cross-sectional view schematically showing an example of a combustion chamber according to a fourth embodiment of the present invention. [Figure 14] FIG. 14 is a cross-sectional view schematically showing an example of a combustion chamber according to a fifth embodiment of the present invention. [Figure 15] FIG. 15 is a cross-sectional view schematically showing an example of a combustion chamber according to a sixth embodiment of the present invention. [Figure 16]FIG. 16 is a cross-sectional view schematically showing an example of a boiler according to a seventh embodiment of the present invention. [Figure 17] FIG. 17 is a cross-sectional view schematically showing an example of a water heater according to an eighth embodiment of the present invention.

[0033] (Detailed Description of the Invention) [Combustion chamber] First, the combustion chamber of the present invention will be described. The combustion chamber of the present invention is a combustion chamber having a metal container, a plate-shaped insulation material containing inorganic fibers arranged so as to contact the inner wall surface of the metal container, and a rod-shaped member and a fixing member for fixing the plate-shaped insulation material to the inner wall surface of the metal container, wherein the plate-shaped insulation material has a bottom surface facing the metal container and has a bottomed hole arranged along the thickness direction of the plate-shaped insulation material, a through hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole, one end of the rod-shaped member is fixed to the metal container arranged inside the bottomed hole and the other end is fixed to the fixing member, in a plane perpendicular to the longitudinal direction of the rod-shaped member, the fixing member has a shape that prevents it from passing through the through hole, and the opening of the bottomed hole is covered with a heat-resistant material.

[0034] The combustion chamber of the present invention includes a rod-shaped member and a fixing member for fixing the plate-shaped insulation to the inner wall surface of the metal container. The rod-shaped member penetrates the bottom surface of the bottomed hole of the plate-shaped insulation, with one end fixed to the metal container and the other end fixed to the fixing member arranged inside the bottomed hole. Therefore, in the combustion chamber of the present invention, the rod-shaped member positions the metal container and the fixing member opposite each other, with the plate-shaped insulation interposed therebetween. The shape of the fixing member in the direction perpendicular to the longitudinal direction of the rod-shaped member is such that it cannot pass through the through hole. Therefore, the fixing member placed inside the bottomed hole of the plate-shaped insulation material can fix the plate-shaped insulation material to the inner wall surface of the metal container. Because the opening of the bottomed hole is covered with a heat-resistant material, the fixing member disposed inside the bottomed hole and the rod-shaped member fixed to the fixing member can be prevented from corroding due to the effects of combustion gases generated inside the metal container, etc., thereby improving maintainability.

[0035] [First embodiment] Fig. 1 is a perspective view schematically showing an example of a combustion chamber according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is a perspective view schematically showing an example of a plate-shaped insulating material used in the combustion chamber shown in Figs. 1 and 2. As shown in Fig. 1, the combustion chamber 1 has a metal container 50 and a plate-shaped insulating material 10 arranged on the inner wall surface of the metal container 50. The plate-shaped insulating material 10 is configured to contain inorganic fibers.

[0036] The internal space of the metal container 50 is defined by a top surface 50a, a bottom surface 50b, and an inner side surface 50c. The plate-shaped heat insulating material 10 is arranged so as to be in contact with the top surface 50 a which is the inner wall surface of the metal container 50 .

[0037] As shown in FIG. 2, the combustion chamber 1 further includes a rod-shaped member 20 and a fixing member 30. The plate-shaped heat insulating material 10 is fixed to the top surface 50 a , which is the inner wall surface of the metal container 50 , by means of rod-shaped members 20 and fixing members 30 .

[0038] 2 and 3, the plate-shaped insulating material 10 has a plate-like shape with relatively large first and second main surfaces 10a, 10b, and a side surface 10c connecting the first and second main surfaces 10a, 10b. The plate-shaped insulating material 10 further has bottomed holes 13 opening to the first main surface 10a, and through holes 16 connecting the bottoms of the bottomed holes to the second main surface 10b.

[0039] The reason why the plate-shaped insulating material is fixed to the inner wall surface of the metal container by the rod-shaped members and fixing members will be explained with reference to FIGS. 4, 5, 6 and 7. FIG.

[0040] Fig. 4 is a cross-sectional view schematically showing an example of a process for fixing one end of a rod-shaped member to the inner wall surface of a metal container. Fig. 5 is a cross-sectional view schematically showing an example of a process for arranging a plate-shaped insulating material on the inner wall surface of a metal container. Fig. 6 is a cross-sectional view schematically showing an example of a process for fixing a fixing member to the other end of the rod-shaped member. Fig. 7 is a cross-sectional view schematically showing an example of a process for covering the opening of a bottomed hole of a plate-shaped paperboard with a heat-resistant material.

[0041] First, one end 20a of the rod-shaped member 20 is fixed to the top surface 50a of the metal container 50, as shown in FIG.

[0042] 5, a rod-shaped member 20 is passed through the through-hole 16 provided in the bottom surface 13b of the bottomed hole in the plate-shaped insulation material 10, and the plate-shaped insulation material 10 is placed on the top surface 50a, which is the inner wall surface of the metal container 50. At this time, the bottom surface 13b of the bottomed hole 13 provided in the plate-shaped insulation material 10 is placed on the metal container 50 side.

[0043] At this time, the plate-shaped insulating material 10 is only in contact with the top surface 50a of the metal container 50. Therefore, if the worker does not hold the plate-shaped insulating material 10 with his / her hand or a jig, the plate-shaped insulating material 10 will fall off the top surface 50a of the metal container 50.

[0044] Subsequently, as shown in FIG. 6, the other end 20b of the rod-shaped member 20 is fixed to the fixing member 30 disposed in the bottomed hole 13. Here, in a plane perpendicular to the longitudinal direction of the rod-shaped member 20, the fixing member 30 has a shape that prevents it from passing through the through-hole 16. Therefore, one end 20a of the rod-shaped member 20 is fixed to the top surface 50a of the metal container 50, and the other end 20b of the rod-shaped member is fixed to the fixing member 30, so that the plate-shaped insulating material 10 is sandwiched and fixed between the metal container 50 and the fixing member 30, which are fixed to both ends of the rod-shaped member 20. At this point, the plate-shaped insulating material 10 is fixed to the top surface 50a of the metal container 50, even if the worker is not holding the plate-shaped insulating material 10 with his / her hand, a jig, or the like.

[0045] 7, the openings 13a of the bottomed holes 13 of the plate-shaped insulation material 10 are covered with a heat-resistant material 40, thereby separating the bottomed holes 13 in which the rod-shaped members 20 and fixing members 30 are disposed from the combustion chamber. This prevents the rod-shaped members 20 and fixing members 30 from being corroded by combustion gases and the like generated inside the metal container 50.

[0046] The above process allows the plate insulation material to be fixed to the inner wall surface of the metal container using the rod-shaped members and fixing members. Furthermore, corrosion of the rod-shaped members and fixing members due to the influence of combustion gases generated inside the metal container can be suppressed, improving maintainability.

[0047] The process of fixing the plate-shaped insulation material to the inner wall surface of the metal container can be carried out in any order so long as the plate-shaped insulation material is ultimately fixed to the inner wall surface of the metal container by the rod-shaped members and fixing members, and is not limited to the order shown in Figures 4 to 6. For example, the plate-shaped insulation material can also be fixed to the inner wall surface of the metal container using the rod-shaped member and the fixing member in the following order: first, the plate-shaped insulation material is placed on the inner wall surface of the metal container, then the rod-shaped member is passed through the through hole of the plate-shaped insulation material and one end of the rod-shaped member is fixed to the inner wall surface of the metal container, and finally the fixing member is fixed to the other end of the rod-shaped member.

[0048] [Plate-shaped insulation material] The plate-shaped insulating material contains inorganic fibers. The inorganic fibers preferably include at least one selected from the group consisting of biosoluble fibers, alumina fibers, rock wool, and glass fibers. As the biosoluble fiber, alkaline earth silicate fiber can be used. When the inorganic fibers contain the above-mentioned materials, a plate-shaped insulating material having excellent heat resistance can be obtained.

[0049] The plate-shaped insulating material may be a molded body obtained by solidifying an amorphous material, a paper-formed body, or a needle-shaped body. It may also be a plate-shaped molded body, a plate-shaped paper-formed body, or a plate-shaped needle-shaped body. A molded body formed by solidifying an amorphous material is one that is obtained by pouring an amorphous material containing an inorganic material into a mold, solidifying it, drying it, and molding it, and a plate-shaped molded body is one that is obtained by solidifying the amorphous material into a plate shape, drying it, and molding it. A paper product is a molded body obtained by pouring a slurry containing inorganic fibers into a mold, suction dewatering it, and drying (papermaking method), and a plate-shaped paper product is a plate-shaped paper product obtained by the papermaking method. The needle body is a molded body obtained by subjecting an inorganic fiber aggregate to a needling treatment, and the plate-like needle body is a plate-like needle body obtained by subjecting an inorganic fiber aggregate to a needling treatment.

[0050] Among these, the plate-shaped heat insulating material is preferably a paper product, and more preferably a plate-shaped paper product. The sheet-shaped paper product has the property of being resistant to deformation and having little uneven distribution of inorganic fibers, and is therefore suitable as a sheet-shaped insulating material to be placed inside a combustion chamber.

[0051] There are no particular restrictions on the average fiber diameter of the inorganic fibers, but when the plate-shaped heat insulating material is a paper product, it is preferably 2.0 to 15.0 μm. When the plate-shaped heat insulating material is a paper product, if the average fiber diameter of the inorganic fibers is within the above range, a dense paper product with little density deviation can be obtained.

[0052] There are no particular restrictions on the average fiber length of the inorganic fibers, but when the plate-shaped heat insulating material is a paper product, it is preferably 0.05 to 3.0 mm. When the plate-shaped insulating material is a paper product, if the average fiber length of the inorganic fibers is within the above range, a laminated plate-shaped molded product with little unevenness of the inorganic fibers can be obtained, and the bulk density and insulating properties will be stable.

[0053] The bulk density of the plate-shaped insulation material is not particularly limited, but when the plate-shaped insulation material is a paper-made material, it is 0.2 to 0.6 g / cm 3 It is preferable that: When the bulk density of the plate-shaped insulating material is within the above range, the increase in weight of the combustion chamber can be suppressed compared to refractory materials and insulating materials made of amorphous materials.

[0054] The bulk density can be adjusted, for example, in the case of a molded body of an amorphous material containing inorganic fibers, by adjusting the amount of water contained in the amorphous material before drying and solidification; in the case of a paper-molded body, by adjusting the compression conditions during slurry dehydration and drying; and in the case of a needle body, by adjusting the needle density and the number of times of needling treatment.

[0055] The bulk density of a molded body obtained by drying and solidifying an amorphous material containing inorganic fibers is usually 0.7 to 1.5 g / cm. 3 The bulk density of the needle body is usually about 0.07 to 0.18 g / cm3, which does not satisfy the preferable bulk density of the plate-shaped insulating material described above. 3 Therefore, from the viewpoint of adjusting the bulk density of the plate-shaped insulating material to a suitable range, the plate-shaped insulating material is preferably a paper body or a needle body, and more preferably a paper body.

[0056] The thickness of the plate-shaped heat insulating material is preferably 1 to 10 cm. When the plate-shaped insulating material has a thickness within the above range, it can exhibit sufficient insulating properties.

[0057] The volume of the plate insulation is 700 to 150,000 cm 3 When the volume of the plate-shaped insulating material is within the above range, breakage due to thermal shrinkage is particularly unlikely to occur. The volume of the plate-shaped insulating material includes the volumes of the bottomed holes and through-holes, as well as the volumes of second through-holes, recesses and grooves, which will be described later.

[0058] The plate-shaped insulating material may be provided with a second through-hole penetrating through it in the thickness direction. By forming such holes, it becomes easier to cover the inner wall surface of the combustion chamber in which piping such as water pipes and smoke pipes are arranged. The second through hole is different from the through hole provided at the bottom of the bottomed hole (also referred to as the first through hole for distinction), and does not overlap with the bottomed hole in plan view. Therefore, the second through hole may overlap with a recess or a groove in plan view. Furthermore, the through hole (first through hole) provided at the bottom of the blind hole and the second through hole are distinguished by whether one end is connected to the blind hole or not. A through hole having one end connected to the blind hole is a first through hole, and a through hole having both ends not connected to the blind hole is a second through hole.

[0059] The plate-shaped insulating material may contain components other than inorganic fibers. Examples of components other than inorganic fibers include inorganic particles, inorganic binders, organic binders, and flocculants.

[0060] Examples of inorganic particles include silica particles, alumina particles, titania particles, zirconia particles, and natural mineral particles. Examples of inorganic binders include silica sol, alumina sol, titania sol, zirconia sol, and fumed silica. Examples of the organic binder include polyvinyl alcohol, starch, acrylic resin, and polyacrylamide.

[0061] The weight ratio of the inorganic fibers in the plate-shaped thermal insulation material is preferably 30 to 97% by weight.

[0062] The surface of the plate-shaped insulating material may be provided with recesses or grooves. In this specification, recesses and grooves are distinguished by the ratio of their depth length (hereinafter referred to as depth dimension) to their width length (hereinafter referred to as width dimension) in a cross section perpendicular to the direction in which the recesses and grooves extend. Specifically, a recess is one in which the width / depth ratio is 5 or more, and a groove is one in which the width / depth ratio is less than 5.

[0063] FIG. 8 is a perspective view schematically showing another example of a plate-shaped insulating material used in the combustion chamber of the present invention. The plate-shaped insulating material 10 shown in FIG. 8 has a plate-like shape having relatively large first and second main surfaces 10a, 10b, and side surfaces 10c connecting the first and second main surfaces 10a, 10b. The plate-shaped heat insulating material 10 is provided with a bottomed hole 13, a through hole 16, and a recess 17. The recess 17 is provided on the second main surface 10b of the plate-shaped heat insulating material 10. The recess 17 has a ring shape in a plan view, and is provided at a position that does not overlap with the through hole 16 and the bottomed hole 13 in a plan view.

[0064] The recess 17 is preferably provided on the second main surface 10b of the plate insulator 10, which is the surface on the metal container side. When recesses 17 are provided on the surface of plate insulator 10 facing the metal container, recesses 17 function as air spaces, and the insulating performance of plate insulator 10 can be improved.

[0065] FIG. 9 is a perspective view schematically showing yet another example of a plate-shaped insulating material used in a combustion chamber of the present invention. The plate-shaped insulating material 10 shown in FIG. 9 has a plate-like shape having relatively large first and second main surfaces 10a, 10b, and side surfaces 10c connecting the first and second main surfaces 10a, 10b. The plate-shaped heat insulating material 10 is provided with a bottomed hole 13, a through hole 16, and a groove 18. A total of four grooves 18 are provided on the first main surface 10a of the plate-shaped insulation material 10. In plan view, each groove 18 has a linear shape extending from the side surface 10c of the plate-shaped insulation material 10 toward the center of the plate-shaped insulation material 10. However, the grooves 18 do not reach the bottomed holes 13. If the grooves did reach the bottomed holes, there is a risk that combustion gas would enter the inside of the bottomed holes through the grooves.

[0066] The grooves 18 are preferably provided on the first main surface 10a of the plate insulator 10, which is the surface opposite to the surface on the metal container side. When groove 18 is provided on the surface of plate-shaped insulation 10 opposite the surface facing the metal container, cracks caused by thermal contraction on the surface of plate-shaped insulation 10 facing the inside of the combustion chamber can be prevented.

[0067] The grooves may have partially different widths and depths. By varying the width and depth of the grooves in some areas, it is possible to alleviate stress caused by differences in the amount of heat applied to different parts of the plate-shaped insulation material, and the occurrence of cracks can be more effectively suppressed.

[0068] The plate-shaped insulating material has a bottom surface facing the metal container and has a bottomed hole provided along the thickness direction of the plate-shaped insulating material. A through-hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole.

[0069] The depth of the bottomed hole is preferably 0.5 to 7 cm. The depth of the bottomed holes is preferably 30 to 70% of the thickness of the plate-shaped heat insulating material.

[0070] The opening area of ​​each bottomed hole is 3 to 50 cm 2 It is preferable that:

[0071] When the plate-shaped insulating material is viewed in the thickness direction, the bottomed holes are preferably provided at positions that do not overlap with the recesses or grooves.

[0072] The blind holes are distinguished from the above-mentioned grooves and recesses by whether or not their openings are covered with a heat-resistant material. That is, blind holes are those whose openings are covered with a heat-resistant material, while grooves or recesses are those whose openings are not covered with a heat-resistant material.

[0073] [Heat-resistant material] The shape of the heat-resistant material is not particularly limited as long as it can cover the opening of the bottomed hole, but examples include a lid shape that covers only the opening, and an amorphous shape that is filled into the bottomed hole and then dried and solidified. It is also possible to directly cover the rod-shaped member and the fixing member with the heat-resistant material. For example, a sheet-like heat-resistant material containing inorganic fibers may be attached to the surfaces of the rod-shaped member and the fixing member with an inorganic adhesive, or an inorganic adhesive may be applied to the inside and periphery of the bottomed hole to fix the sheet-like heat-resistant material containing inorganic fibers. For example, the rod-shaped member and the fixing member may be covered with a sheet-like heat-resistant material containing inorganic fibers and then tied and fixed with a string-like material containing inorganic fibers.

[0074] As the heat-resistant material, for example, a first amorphous material containing an inorganic material can be used. When the heat-resistant material is a first amorphous material containing an inorganic material, it is suitable as a material that protects the rod-shaped member and the fixing member from combustion gases, etc. Furthermore, the first amorphous material containing an inorganic material can be easily filled into the bottomed hole, thereby improving workability.

[0075] Examples of inorganic materials constituting the first amorphous material include inorganic fibers, inorganic particles, and inorganic colloidal sols that constitute plate-shaped heat insulating materials.

[0076] In the combustion chamber of the present invention, the opening of the blind hole may be filled with a heat-resistant material. An example in which the opening of the bottomed hole is filled with a heat-resistant material will be described below as a second embodiment.

[0077] [Second embodiment] FIG. 10 is a cross-sectional view that schematically shows an example of a combustion chamber according to a second embodiment of the present invention. In the combustion chamber 2 shown in FIG. 10, the openings 13a of the bottomed holes 13 of the plate-shaped heat insulating material 10 are filled with a heat-resistant material 41. With the above configuration, the combustion gas generated inside the metal container 50 can be further prevented from entering the bottomed hole 13 .

[0078] In the combustion chamber of the present invention, it is preferable that the bottom area of ​​the bottomed hole is larger than the opening area of ​​the bottomed hole, and that the bottomed hole is filled from the opening to the bottom surface with a heat-resistant material. Such an example will be described below as a third embodiment.

[0079] [Third embodiment] FIG. 11 is a cross-sectional view schematically showing an example of a combustion chamber according to a third embodiment of the present invention. 11, the area (bottom area) of the bottom surface 14b of the bottomed hole 14 is larger than the area (opening area) of the opening 14a. When the heat-resistant material is filled from the opening 14a to the bottom surface 14b of the bottomed hole 14, which has a bottom area larger than the opening area, the shape of the heat-resistant material 41 arranged on the bottom surface 14b side of the bottomed hole 14 is such that it cannot pass through the opening 14a of the bottomed hole 14. Therefore, the heat-resistant material 41 is less likely to fall out of the bottomed hole 14.

[0080] The bottom area of ​​the bottomed hole is preferably 110 to 300% of the opening area.

[0081] 11, one method for producing a plate insulation material having the shape shown in Fig. 11 is to prepare a first plate insulation sheet having only through holes and a second plate insulation sheet having only tapered through holes that form the spaces between the bottomed holes, and then stack and bond the first and second plate insulation sheets together with the surface of the second plate insulation sheet with the larger opening area of ​​the through holes facing the first plate insulation sheet. The first and second plate insulation sheets can be bonded together by, for example, a heat-resistant adhesive or by sewing them together with heat-resistant fiber.

[0082] [Rod-shaped members and fixed members] In the combustion chamber of the present invention, the plate-shaped heat insulating material is fixed to the inner wall surface of the metal container by the rod-shaped member and the fixing member. One end of the rod-shaped member is fixed to the inner wall surface of the metal container, and the other end of the rod-shaped member is fixed to the fixing member.

[0083] Examples of the rod-shaped member include a metal or ceramic rod, a cut bolt (also called a long-thread bolt), and the like. Examples of metals that can be used to form the rod-shaped member include iron, copper, steel, stainless steel, Inconel (registered trademark), Hastelloy (registered trademark), and Invar (registered trademark). Examples of ceramics that form the rod-shaped member include alumina, zirconia, carbon, silicon carbide, and silicon nitride.

[0084] Methods for fixing one end of the rod-shaped member to the inner wall surface of the metal container include, for example, welding and screwing. In the case of screwing, for example, a hole may be provided in advance on the inner wall surface of the metal container, with a groove (internal thread) formed therein that corresponds to the spiral groove provided on one end of the rod-shaped member.

[0085] Methods for fixing the other end of the rod-shaped member to the fixed portion include, for example, welding, screwing, gripping, and the like.

[0086] The fixing member may be, for example, one that can be threaded into a spiral groove formed on the surface of the other end of the rod-shaped member, and can fix the position of the rod-shaped member at any position in the longitudinal direction. Furthermore, examples of fixing members include those that have a through hole that passes through the rod-shaped member, thereby allowing the member to slide arbitrarily in a specific area from one end of the rod-shaped member to the other end, and that are equipped with a gripping / release mechanism that grips and releases the rod-shaped member at any position, thereby allowing the rod-shaped member to be fixed at any position in the longitudinal direction.

[0087] The material constituting the fixing member can be suitably the same as that of the rod-shaped member. The material constituting the fixing member may be the same as or different from the material constituting the rod-shaped member, but from the viewpoint of aligning the thermal expansion coefficients, it is preferable that they are the same.

[0088] Either the metal container or the fixing member may be fixed and integrated with the rod-shaped member from the beginning. As long as either one end or the other end of the rod-shaped member is open, the plate-shaped insulating material can be attached and detached from the inner wall surface of the metal container.

[0089] An example of a structure in which one end of a rod-shaped member and a metal container are fixed and integrated in advance is one in which one end of a cut bolt is fixed to the inner wall surface of the metal container by means of welding or the like. In this case, for example, the plate-shaped insulation material can be placed on the inner wall surface of the metal container so that the rod-shaped member passes through the through hole provided in the plate-shaped insulation material, and a fixing member can be fixed to the other end of the rod-shaped member, thereby fixing the plate-shaped insulation material to the inner wall surface of the metal container.

[0090] Examples of the other end of a rod-shaped member and a fixing member that are fixed and integrated in advance include headed bolts (also simply called bolts), such as hexagonal bolts, hexagon socket head bolts, and butterfly bolts. In a headed bolt, the bolt head is the fixing member, and can be considered to be fixed and integrated with the rod-shaped member, the threaded bolt, from the beginning. When a hexagonal bolt is used to fix the other end of the rod-shaped member and the fixing member together in advance, for example, one end of the rod-shaped member can be passed through a through hole in the plate-shaped insulation material, and then the one end of the rod-shaped member can be screwed into a threaded hole provided on the inner wall surface of the metal container, the threaded hole having a spiral groove (internal thread) on the inner surface. This fixes the plate-shaped insulation material to the inner wall surface of the metal container.

[0091] FIG. 12 is a perspective view schematically showing another example of the rod-shaped member and the fixing member. A spiral groove 22 (male thread) is formed on the side surface of the rod-shaped member 21. One end 21a of the rod-shaped member 21 is fixed by being screwed into a spiral groove (internal thread) formed in a metal container (not shown). The other end 21b of the rod-shaped member is fixed by being screwed into a spiral groove 32 (female thread) formed on the inner surface of the fixing member 31. The rod-shaped member 21 is a so-called threaded bolt, and the fixing member 31 is a so-called nut. The above configuration simplifies the process of fixing the rod-shaped member 21 to the fixing member 31. Furthermore, since the fixing can be easily released, the plate insulation material 10 can be easily removed for inspection or replaced, resulting in excellent maintainability.

[0092] In the rod-shaped member 21 shown in FIG. 12, the spiral groove 22 is formed on the entire side surface of the rod-shaped member 21, but the spiral groove 22 may be formed only on the portion necessary for screwing with the metal container 50 and the fixing member 31. An example of a combustion chamber using the rod-shaped member and fixed member shown in FIG. 12 will be described below as a fourth embodiment.

[0093] [Fourth embodiment] FIG. 13 is a cross-sectional view schematically showing an example of a combustion chamber according to a fourth embodiment of the present invention. In the combustion chamber 4 shown in FIG. 13, the plate-shaped insulating material 10 is fixed to the top surface 50a of the metal container 50 by the rod-shaped members 21 and the fixing members 31. The surface (first main surface 10a) of the plate-shaped heat insulating material 10 on the combustion chamber side is provided with a bottomed hole 13 with the metal container 50 side serving as the bottom surface 13b. The bottomed hole 13 is filled with a heat-resistant material 41 from the opening 13a to the bottom surface 13b.

[0094] One end of the rod-shaped member 21 is fixed by being screwed onto the top surface 50a of the metal container 50, and the other end of the rod-shaped member 21 is fixed by being screwed onto the fixing member 31.

[0095] The tip of the other end 21b of the rod-shaped member 21 has a protruding portion 21b1 that protrudes further into the metal container 50 than the fixing member 31. When the rod-shaped member 21 has the protruding portion 21b1, the heat-resistant material 41 covering the protruding portion 21b1 acts as a catch, and the heat-resistant material 41 can be prevented from falling out of the bottomed hole 13. In this case, if a spiral groove 22 is formed in the protrusion 21b1 as shown in Figure 13, the heat-resistant material 41 will be more firmly caught, further preventing the heat-resistant material 41 from falling out of the bottomed hole 13.

[0096] The combustion chamber of the present invention preferably has a plurality of rod-shaped members, the plate-shaped insulation has a plurality of bottomed holes, a rod-shaped member passes through a through-hole in the bottom surface of each bottomed hole, and the plate-shaped insulation is fixed to the inner wall surface of the metal container by fixing members fixed to the other ends of each rod-shaped member. In such a case, it can be said that one plate-shaped insulation is fixed to the inner wall surface of the metal container by a plurality of "pairs of rod-shaped members and fixing members." An example of such a case will be described below as a fifth embodiment.

[0097] FIG. 14 is a cross-sectional view schematically showing an example of a combustion chamber according to a fifth embodiment of the present invention. The combustion chamber 5 shown in FIG. 14 has a metal container 50, a plate-shaped insulating material 10 arranged on a top surface 50a which is the inner wall surface of the metal container 50, a rod-shaped member 21, and a fixing member 31. The plate-shaped insulation material 10 has two bottomed holes 13, and a rod-shaped member 21 and a fixing member 31 are disposed in each bottomed hole 13. In other words, the plate-shaped insulation material 10 is fixed to the top surface 50a of the metal container 50 at two locations by two sets of rod-shaped members 21 and fixing members 31.

[0098] In the combustion chamber of the present invention, the plate insulation may be composed of an assembly of a plurality of insulation elements containing inorganic fibers. Each insulation element has a bottom surface facing the metal container and a bottomed hole provided along the thickness direction of the plate insulation, and the bottom surface of each bottomed hole preferably has a through hole through which the rod-shaped member passes. Each insulation element is preferably fixed to the inner wall surface of the metal container by the rod-shaped member and a fixing member. An example of such a case will be described below as a sixth embodiment.

[0099] [Sixth embodiment] FIG. 15 is a cross-sectional view schematically showing an example of a combustion chamber according to a sixth embodiment of the present invention. The combustion chamber 6 shown in FIG. 15 has a metal container 50, a plate-shaped heat insulating material 110 arranged on a top surface 50a which is the inner wall surface of the metal container 50, a rod-shaped member 21, and a fixing member 31. The plate-shaped heat insulating material 110 is an assembly of a plurality of heat insulating elements 111 and 112 . When the plate-shaped insulation material 110 is composed of an assembly of multiple insulation elements 111, 112, it becomes easier to change the shape of the entire plate-shaped insulation material so that it can easily follow the shape of the inner wall surface of the metal container, for example, when the shape of the inner wall surface of the metal container is complex.

[0100] The heat insulating bodies 111 and 112 are plate-shaped and have relatively large first main surfaces 111a and 112a and second main surfaces 111b and 112b, respectively, and side surfaces 111c and 112c connecting the first main surfaces 111a and 112a and the second main surfaces 111b and 112b. The heat insulating elements 111 and 112 each have a bottomed hole 13 and are fixed to the top surface 50 a of the metal container 50 by a rod-shaped member 21 and a fixing member 31 .

[0101] The heat insulating body 111 and the heat insulating body 112 are in contact with each other without any gaps along the surface direction (x and y directions) of the plate heat insulating material 110. That is, one of the side surfaces 111c of the heat insulating body 111 and one of the side surfaces 112c of the heat insulating body 112 are in contact with each other without any gaps. When the two heat insulating elements 111, 112 facing each other in the planar direction are in contact with each other with no gaps between them, the heat insulating properties of the plate heat insulating material 110 can be improved.

[0102] When the plate-shaped insulating material includes a plurality of insulating elements, the insulating elements may be arranged along the surface direction of the plate-shaped insulating material so that gaps are formed between them. In this case, the gap is preferably filled with a second amorphous material containing an inorganic material. As the second amorphous material, the same material as the first amorphous material can be suitably used.

[0103] Each heat insulating element is made up of inorganic fibers. As the inorganic fibers constituting the heat insulating element, the same inorganic fibers as those constituting the plate-shaped heat insulating material of the present invention can be suitably used. As for materials other than inorganic fibers, materials similar to those used for the plate-shaped insulating material of the present invention can also be suitably used.

[0104] The heat insulating element is preferably a sheet-shaped paper product. The size of the blind holes provided in the heat insulating element is preferably the same as the size of the blind holes provided in the plate-shaped heat insulating material.

[0105] In the combustion chamber of the present invention, the plate-shaped insulation material may be placed on the top or bottom surface of the metal container, and a third amorphous material containing an inorganic material may be filled between the side surface of the plate-shaped insulation material and the inner wall surface of the metal container. As the third amorphous material, the same material as the first amorphous material described above can be suitably used.

[0106] The combustion chamber of the present invention can be used in devices equipped with a combustion chamber, such as boilers and water heaters.

[0107] [Boiler] The boiler of the present invention is characterized by including the combustion chamber of the present invention. The boiler of the present invention is equipped with the combustion chamber of the present invention, and therefore corrosion of the heat insulating material fixing jig can be suppressed, resulting in good maintainability.

[0108] An example of the boiler of the present invention will be described below as a seventh embodiment.

[0109] [Seventh embodiment] FIG. 16 is a cross-sectional view schematically showing an example of a boiler according to a seventh embodiment of the present invention. The boiler 600 has a combustion chamber 7 and a water tube 80 arranged in the combustion chamber 7. The combustion chamber 7 has a metal container 60, and plate-shaped insulation 10 arranged on the top surface 60a and bottom surface 60b of the metal container 60. The plate-shaped insulation 10 is fixed to the top surface 60a of the metal container 60 at two locations by two sets of rod-shaped members 20 and fixing members 30. The two sets of rod-shaped members 20 and fixing members 30 are each housed in a bottomed hole 13 of the plate-shaped insulation 10, and the opening of the bottomed hole 13 is covered with a heat-resistant material 40. Therefore, the combustion chamber 7 is a combustion chamber of the present invention. Water is supplied into the water pipe 80 from the lower part of the combustion chamber 7 , and the water passing through the water pipe 80 is heated in the combustion chamber 7 to become steam, which is then discharged from the upper part of the combustion chamber 7 . The discharged steam is used for power generation, heating, cleaning, cooking, drying, disinfection, sterilization, etc. after separating the liquid water or superheating as necessary.

[0110] [Water heater] The water heater of the present invention is characterized by including the combustion chamber of the present invention. The water heater of the present invention is equipped with the combustion chamber of the present invention, and therefore corrosion of the heat insulating material fixing jig can be suppressed, resulting in good maintainability.

[0111] An example of the water heater of the present invention will be described below as an eighth embodiment.

[0112] [Eighth embodiment] FIG. 17 is a cross-sectional view schematically showing an example of a water heater according to an eighth embodiment of the present invention. The water heater 700 has a combustion chamber 8 and a heat exchanger 90 disposed within the combustion chamber 8. The combustion chamber 8 has a metal container 70, and plate-shaped insulation 10 arranged on the top surface 70a and bottom surface 70b of the metal container 70. The plate-shaped insulation 10 is fixed to the top surface 70a of the metal container 70 at two locations by two sets of rod-shaped members 20 and fixing members 30. The two sets of rod-shaped members 20 and fixing members 30 are each housed in a bottomed hole 13 of the plate-shaped insulation 10, and the opening of the bottomed hole 13 is covered with a heat-resistant material 40. Therefore, the combustion chamber 8 is a combustion chamber of the present invention. Water flows through the heat exchanger 90, and the water in the heat exchanger 90 is heated in the combustion chamber 8 to become hot water (hot water), which is then supplied to the outside of the water heater 700.

[0113] The temperature of the hot water supplied can be adjusted appropriately by adjusting the amount of fuel burned in the combustion chamber and the amount of water passing through the heat exchanger per unit time. [Explanation of symbols]

[0114] 1, 2, 3, 4, 5, 6, 7, 8 combustion chambers 10 Plate-shaped insulation material 10a: First main surface of plate-shaped insulation material 10b Second main surface of plate-shaped insulation material 10c Side of plate insulation 13, 14 Bottomed hole 13a, 14a Opening of bottomed hole 13b, 14b Bottom of bottomed hole 16 through hole (first through hole) 17 Recess 18 Groove 20 Rod-shaped member 21 Rod-shaped parts (thick bolts) 20a, 21a One end of the rod-shaped member 20b, 21b: the other end of the rod-shaped member 21b1 Protrusion 22 Spiral groove (external thread) 30 Fixing member 31 Fixing member (nut) 32 Spiral groove (female thread) 40, 41 Heat-resistant materials 50, 60, 70 metal container 50a, 60a, 70a Top of metal container 50b, 60b, 70b Bottom of metal container 50c Inner surface of metal container 80 water tube 90 Heat exchanger 110 Plate-shaped insulation material 111, 112 Insulation element 111a, 112a: First main surface of the heat insulating element 111b, 112b: second main surface of the heat insulating element 111c, 112c Side of the thermal insulation element 600 Boiler 700 Water Heater

Claims

1. A metal container; a plate-shaped insulating material containing inorganic fibers arranged so as to contact the inner wall surface of the metal container; a rod-shaped member and a fixing member for fixing the plate-shaped insulating material to the inner wall surface of the metal container, The plate-shaped insulation material has a bottom surface facing the metal container and has a bottomed hole provided along a thickness direction of the plate-shaped insulation material, a through hole through which the rod-shaped member passes is formed in the bottom surface of the bottomed hole; one end of the rod-shaped member is fixed to the metal container, and the other end is fixed to the fixing member disposed inside the bottomed hole; In a plane perpendicular to the longitudinal direction of the rod-shaped member, the fixing member has a shape that cannot pass through the through hole, a bottom area of ​​the bottomed hole is larger than an opening area of ​​the bottomed hole; A combustion chamber characterized in that a heat-resistant material is filled from the opening of the bottomed hole to the bottom surface.

2. The combustion chamber according to claim 1 , wherein the heat-resistant material is a first amorphous material including an inorganic material.

3. 3. The combustion chamber according to claim 1, wherein a spiral groove is formed on the surface of the rod-shaped member, and the rod-shaped member is fixed to the fixing member by being screwed together with the fixing member.

4. the rod-shaped member has a protruding portion at a tip thereof that protrudes further inwardly of the metal container than the fixing member; 4. The combustion chamber according to claim 1, wherein the protrusion is covered with the heat-resistant material filled in the blind hole.

5. The combustion chamber according to any one of claims 1 to 4, wherein the plate-shaped insulating material is a plate-shaped paper product.

6. The combustion chamber according to any one of claims 1 to 5, wherein the inorganic fibers include at least one selected from the group consisting of biosoluble fibers, alumina fibers, rock wool, and glass fibers.

7. The combustion chamber according to claim 6, wherein the inorganic fibers have an average fiber length of 0.05 to 3.0 mm.

8. The bulk density of the plate-shaped insulating material is 0.2 to 0.6 g / cm ３ The combustion chamber according to any one of claims 1 to 7,

9. 9. The combustion chamber according to claim 1, wherein a recess is provided on a surface of the plate-shaped insulating material facing the metal container.

10. 10. The combustion chamber according to claim 1, wherein a groove is provided on a surface of the plate-shaped insulating material opposite to the surface on the metal container side.

11. A plurality of the rod-shaped members are provided, The plate-shaped insulating material has a plurality of the bottomed holes, the rod-shaped member passes through a through hole in the bottom surface of each of the bottomed holes, A combustion chamber as described in any one of claims 1 to 10, wherein the plate-shaped insulation material is fixed to the inner wall surface of the metal container by the fixing member fixed to the other end of each of the rod-shaped members.

12. A plurality of the rod-shaped members are provided, the plate-shaped insulation material is composed of an aggregate of a plurality of insulation elements containing the inorganic fibers, Each of the heat insulating elements has a bottom surface facing the metal container and has a bottomed hole provided along the thickness direction of the plate-shaped heat insulating material, a through hole through which the rod-shaped member passes is formed in the bottom surface of each of the bottomed holes; the rod-shaped member passes through a through hole in the bottom surface of each of the bottomed holes, A combustion chamber according to any one of claims 1 to 10, wherein each of the heat insulating bodies is fixed to the inner wall surface of the metal container by each of the fixing members fixed to the other end of each of the rod-shaped members.

13. The combustion chamber according to claim 12 , wherein the plurality of heat insulating elements are in contact with one another without any gaps along the surface direction of the plate-shaped heat insulating material.

14. The combustion chamber according to claim 12, wherein the plurality of insulating elements are arranged so as to form gaps along the surface direction of the plate-shaped insulating material, and the gaps are filled with a second amorphous material containing an inorganic material.

15. The plate-shaped insulating material is disposed on a top surface or a bottom surface of the metal container, A combustion chamber according to any one of claims 1 to 14, wherein a third amorphous material containing an inorganic material is filled between the side surface of the plate-shaped insulation material and the inner surface of the metal container.

16. A boiler comprising the combustion chamber according to any one of claims 1 to 15.

17. A water heater comprising the combustion chamber according to any one of claims 1 to 15.

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